Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (41 commits)
  ACPICA: hw: Don't carry spinlock over suspend
  ACPICA: hw: remove use_lock flag from acpi_hw_register_{read, write}
  ACPI: cpuidle: port idle timer suspend/resume workaround to cpuidle
  ACPI: clean up acpi_enter_sleep_state_prep
  Hibernation: Make sure that ACPI is enabled in acpi_hibernation_finish
  ACPI: suppress uninitialized var warning
  cpuidle: consolidate 2.6.22 cpuidle branch into one patch
  ACPI: thinkpad-acpi: skip blanks before the data when parsing sysfs
  ACPI: AC: Add sysfs interface
  ACPI: SBS: Add sysfs alarm
  ACPI: SBS: Add ACPI_PROCFS around procfs handling code.
  ACPI: SBS: Add support for power_supply class (and sysfs)
  ACPI: SBS: Make SBS reads table-driven.
  ACPI: SBS: Simplify data structures in SBS
  ACPI: SBS: Split host controller (ACPI0001) from SBS driver (ACPI0002)
  ACPI: EC: Add new query handler to list head.
  ACPI: Add acpi_bus_generate_event4() function
  ACPI: Battery: add sysfs alarm
  ACPI: Battery: Add sysfs support
  ACPI: Battery: Misc clean-ups, no functional changes
  ...

Fix up conflicts in drivers/misc/thinkpad_acpi.[ch] manually

21 files changed, 2008 insertions, 2236 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 4875f01..b833891 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -88,7 +88,7 @@ config ACPI_PROC_EVENT
 
 config ACPI_AC
 	tristate "AC Adapter"
-	depends on X86
+	depends on X86 && POWER_SUPPLY
 	default y
 	help
 	  This driver adds support for the AC Adapter object, which indicates
@@ -97,7 +97,7 @@ config ACPI_AC
 
 config ACPI_BATTERY
 	tristate "Battery"
-	depends on X86
+	depends on X86 && POWER_SUPPLY
 	default y
 	help
 	  This driver adds support for battery information through
@@ -117,6 +117,7 @@ config ACPI_BUTTON
 config ACPI_VIDEO
 	tristate "Video"
 	depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
+	depends on INPUT
 	help
 	  This driver implement the ACPI Extensions For Display Adapters
 	  for integrated graphics devices on motherboard, as specified in
@@ -349,12 +350,11 @@ config ACPI_HOTPLUG_MEMORY
 		$>modprobe acpi_memhotplug 
 
 config ACPI_SBS
-	tristate "Smart Battery System (EXPERIMENTAL)"
+	tristate "Smart Battery System"
 	depends on X86
-	depends on EXPERIMENTAL
+	depends on POWER_SUPPLY
 	help
-	  This driver adds support for the Smart Battery System.
-	  A "Smart Battery" is quite old and quite rare compared
-	  to today's ACPI "Control Method" battery.
+	  This driver adds support for the Smart Battery System, another
+	  type of access to battery information, found on some laptops.
 
 endif	# ACPI
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index d4336f1..54e3ab0 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -60,3 +60,4 @@ obj-$(CONFIG_ACPI_TOSHIBA)	+= toshiba_acpi.o
 obj-$(CONFIG_ACPI_HOTPLUG_MEMORY)	+= acpi_memhotplug.o
 obj-y				+= cm_sbs.o
 obj-$(CONFIG_ACPI_SBS)		+= sbs.o
+obj-$(CONFIG_ACPI_SBS)		+= sbshc.o
diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 26d7070..e03de37 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -29,6 +29,7 @@
 #include <linux/types.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/power_supply.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 
@@ -72,16 +73,37 @@ static struct acpi_driver acpi_ac_driver = {
 };
 
 struct acpi_ac {
+	struct power_supply charger;
 	struct acpi_device * device;
 	unsigned long state;
 };
 
+#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
+
 static const struct file_operations acpi_ac_fops = {
 	.open = acpi_ac_open_fs,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 };
+static int get_ac_property(struct power_supply *psy,
+			   enum power_supply_property psp,
+			   union power_supply_propval *val)
+{
+	struct acpi_ac *ac = to_acpi_ac(psy);
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = ac->state;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static enum power_supply_property ac_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
 
 /* --------------------------------------------------------------------------
                                AC Adapter Management
@@ -208,6 +230,7 @@ static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 		acpi_bus_generate_netlink_event(device->pnp.device_class,
 						  device->dev.bus_id, event,
 						  (u32) ac->state);
+		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 		break;
 	default:
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
@@ -244,7 +267,12 @@ static int acpi_ac_add(struct acpi_device *device)
 	result = acpi_ac_add_fs(device);
 	if (result)
 		goto end;
-
+	ac->charger.name = acpi_device_bid(device);
+	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
+	ac->charger.properties = ac_props;
+	ac->charger.num_properties = ARRAY_SIZE(ac_props);
+	ac->charger.get_property = get_ac_property;
+	power_supply_register(&ac->device->dev, &ac->charger);
 	status = acpi_install_notify_handler(device->handle,
 					     ACPI_ALL_NOTIFY, acpi_ac_notify,
 					     ac);
@@ -279,7 +307,8 @@ static int acpi_ac_remove(struct acpi_device *device, int type)
 
 	status = acpi_remove_notify_handler(device->handle,
 					    ACPI_ALL_NOTIFY, acpi_ac_notify);
-
+	if (ac->charger.dev)
+		power_supply_unregister(&ac->charger);
 	acpi_ac_remove_fs(device);
 
 	kfree(ac);
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 9b2c0f7..681e26b 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -1,6 +1,8 @@
 /*
- *  acpi_battery.c - ACPI Battery Driver ($Revision: 37 $)
+ *  battery.c - ACPI Battery Driver (Revision: 2.0)
  *
+ *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
+ *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  *
@@ -27,244 +29,288 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/jiffies.h>
+
+#ifdef CONFIG_ACPI_PROCFS
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <asm/uaccess.h>
+#endif
 
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 
-#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
+#include <linux/power_supply.h>
 
-#define ACPI_BATTERY_FORMAT_BIF	"NNNNNNNNNSSSS"
-#define ACPI_BATTERY_FORMAT_BST	"NNNN"
+#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
 
 #define ACPI_BATTERY_COMPONENT		0x00040000
 #define ACPI_BATTERY_CLASS		"battery"
 #define ACPI_BATTERY_DEVICE_NAME	"Battery"
 #define ACPI_BATTERY_NOTIFY_STATUS	0x80
 #define ACPI_BATTERY_NOTIFY_INFO	0x81
-#define ACPI_BATTERY_UNITS_WATTS	"mW"
-#define ACPI_BATTERY_UNITS_AMPS		"mA"
 
 #define _COMPONENT		ACPI_BATTERY_COMPONENT
 
-#define ACPI_BATTERY_UPDATE_TIME	0
-
-#define ACPI_BATTERY_NONE_UPDATE	0
-#define ACPI_BATTERY_EASY_UPDATE	1
-#define ACPI_BATTERY_INIT_UPDATE	2
-
 ACPI_MODULE_NAME("battery");
 
 MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
 MODULE_DESCRIPTION("ACPI Battery Driver");
 MODULE_LICENSE("GPL");
 
-static unsigned int update_time = ACPI_BATTERY_UPDATE_TIME;
-
-/* 0 - every time, > 0 - by update_time */
-module_param(update_time, uint, 0644);
+static unsigned int cache_time = 1000;
+module_param(cache_time, uint, 0644);
+MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
 
+#ifdef CONFIG_ACPI_PROCFS
 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
 
-static int acpi_battery_add(struct acpi_device *device);
-static int acpi_battery_remove(struct acpi_device *device, int type);
-static int acpi_battery_resume(struct acpi_device *device);
+enum acpi_battery_files {
+	info_tag = 0,
+	state_tag,
+	alarm_tag,
+	ACPI_BATTERY_NUMFILES,
+};
+
+#endif
 
 static const struct acpi_device_id battery_device_ids[] = {
 	{"PNP0C0A", 0},
 	{"", 0},
 };
-MODULE_DEVICE_TABLE(acpi, battery_device_ids);
-
-static struct acpi_driver acpi_battery_driver = {
-	.name = "battery",
-	.class = ACPI_BATTERY_CLASS,
-	.ids = battery_device_ids,
-	.ops = {
-		.add = acpi_battery_add,
-		.resume = acpi_battery_resume,
-		.remove = acpi_battery_remove,
-		},
-};
 
-struct acpi_battery_state {
-	acpi_integer state;
-	acpi_integer present_rate;
-	acpi_integer remaining_capacity;
-	acpi_integer present_voltage;
-};
-
-struct acpi_battery_info {
-	acpi_integer power_unit;
-	acpi_integer design_capacity;
-	acpi_integer last_full_capacity;
-	acpi_integer battery_technology;
-	acpi_integer design_voltage;
-	acpi_integer design_capacity_warning;
-	acpi_integer design_capacity_low;
-	acpi_integer battery_capacity_granularity_1;
-	acpi_integer battery_capacity_granularity_2;
-	acpi_string model_number;
-	acpi_string serial_number;
-	acpi_string battery_type;
-	acpi_string oem_info;
-};
-
-enum acpi_battery_files{
-	ACPI_BATTERY_INFO = 0,
-	ACPI_BATTERY_STATE,
-	ACPI_BATTERY_ALARM,
-	ACPI_BATTERY_NUMFILES,
-};
+MODULE_DEVICE_TABLE(acpi, battery_device_ids);
 
-struct acpi_battery_flags {
-	u8 battery_present_prev;
-	u8 alarm_present;
-	u8 init_update;
-	u8 update[ACPI_BATTERY_NUMFILES];
-	u8 power_unit;
-};
 
 struct acpi_battery {
-	struct mutex mutex;
+	struct mutex lock;
+	struct power_supply bat;
 	struct acpi_device *device;
-	struct acpi_battery_flags flags;
-	struct acpi_buffer bif_data;
-	struct acpi_buffer bst_data;
-	unsigned long alarm;
-	unsigned long update_time[ACPI_BATTERY_NUMFILES];
+	unsigned long update_time;
+	int current_now;
+	int capacity_now;
+	int voltage_now;
+	int design_capacity;
+	int full_charge_capacity;
+	int technology;
+	int design_voltage;
+	int design_capacity_warning;
+	int design_capacity_low;
+	int capacity_granularity_1;
+	int capacity_granularity_2;
+	int alarm;
+	char model_number[32];
+	char serial_number[32];
+	char type[32];
+	char oem_info[32];
+	int state;
+	int power_unit;
+	u8 alarm_present;
 };
 
+#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
+
 inline int acpi_battery_present(struct acpi_battery *battery)
 {
 	return battery->device->status.battery_present;
 }
-inline char *acpi_battery_power_units(struct acpi_battery *battery)
-{
-	if (battery->flags.power_unit)
-		return ACPI_BATTERY_UNITS_AMPS;
-	else
-		return ACPI_BATTERY_UNITS_WATTS;
-}
 
-inline acpi_handle acpi_battery_handle(struct acpi_battery *battery)
+static int acpi_battery_technology(struct acpi_battery *battery)
 {
-	return battery->device->handle;
+	if (!strcasecmp("NiCd", battery->type))
+		return POWER_SUPPLY_TECHNOLOGY_NiCd;
+	if (!strcasecmp("NiMH", battery->type))
+		return POWER_SUPPLY_TECHNOLOGY_NiMH;
+	if (!strcasecmp("LION", battery->type))
+		return POWER_SUPPLY_TECHNOLOGY_LION;
+	if (!strcasecmp("LiP", battery->type))
+		return POWER_SUPPLY_TECHNOLOGY_LIPO;
+	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 }
 
-/* --------------------------------------------------------------------------
-                               Battery Management
-   -------------------------------------------------------------------------- */
-
-static void acpi_battery_check_result(struct acpi_battery *battery, int result)
+static int acpi_battery_get_property(struct power_supply *psy,
+				     enum power_supply_property psp,
+				     union power_supply_propval *val)
 {
-	if (!battery)
-		return;
+	struct acpi_battery *battery = to_acpi_battery(psy);
 
-	if (result) {
-		battery->flags.init_update = 1;
+	if ((!acpi_battery_present(battery)) &&
+	     psp != POWER_SUPPLY_PROP_PRESENT)
+		return -ENODEV;
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (battery->state & 0x01)
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		else if (battery->state & 0x02)
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		else if (battery->state == 0)
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = acpi_battery_present(battery);
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = acpi_battery_technology(battery);
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = battery->design_voltage * 1000;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = battery->voltage_now * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		val->intval = battery->current_now * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+		val->intval = battery->design_capacity * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL:
+	case POWER_SUPPLY_PROP_ENERGY_FULL:
+		val->intval = battery->full_charge_capacity * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+	case POWER_SUPPLY_PROP_ENERGY_NOW:
+		val->intval = battery->capacity_now * 1000;
+		break;
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval = battery->model_number;
+		break;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		val->strval = battery->oem_info;
+		break;
+	default:
+		return -EINVAL;
 	}
+	return 0;
 }
 
-static int acpi_battery_extract_package(struct acpi_battery *battery,
-					union acpi_object *package,
-					struct acpi_buffer *format,
-					struct acpi_buffer *data,
-					char *package_name)
+static enum power_supply_property charge_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static enum power_supply_property energy_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+	POWER_SUPPLY_PROP_ENERGY_FULL,
+	POWER_SUPPLY_PROP_ENERGY_NOW,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+#ifdef CONFIG_ACPI_PROCFS
+inline char *acpi_battery_units(struct acpi_battery *battery)
 {
-	acpi_status status = AE_OK;
-	struct acpi_buffer data_null = { 0, NULL };
+	return (battery->power_unit)?"mA":"mW";
+}
+#endif
 
-	status = acpi_extract_package(package, format, &data_null);
-	if (status != AE_BUFFER_OVERFLOW) {
-		ACPI_EXCEPTION((AE_INFO, status, "Extracting size %s",
-				package_name));
-		return -ENODEV;
-	}
+/* --------------------------------------------------------------------------
+                               Battery Management
+   -------------------------------------------------------------------------- */
+struct acpi_offsets {
+	size_t offset;		/* offset inside struct acpi_sbs_battery */
+	u8 mode;		/* int or string? */
+};
 
-	if (data_null.length != data->length) {
-		kfree(data->pointer);
-		data->pointer = kzalloc(data_null.length, GFP_KERNEL);
-		if (!data->pointer) {
-			ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "kzalloc()"));
-			return -ENOMEM;
-		}
-		data->length = data_null.length;
-	}
+static struct acpi_offsets state_offsets[] = {
+	{offsetof(struct acpi_battery, state), 0},
+	{offsetof(struct acpi_battery, current_now), 0},
+	{offsetof(struct acpi_battery, capacity_now), 0},
+	{offsetof(struct acpi_battery, voltage_now), 0},
+};
 
-	status = acpi_extract_package(package, format, data);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Extracting %s",
-				package_name));
-		return -ENODEV;
-	}
+static struct acpi_offsets info_offsets[] = {
+	{offsetof(struct acpi_battery, power_unit), 0},
+	{offsetof(struct acpi_battery, design_capacity), 0},
+	{offsetof(struct acpi_battery, full_charge_capacity), 0},
+	{offsetof(struct acpi_battery, technology), 0},
+	{offsetof(struct acpi_battery, design_voltage), 0},
+	{offsetof(struct acpi_battery, design_capacity_warning), 0},
+	{offsetof(struct acpi_battery, design_capacity_low), 0},
+	{offsetof(struct acpi_battery, capacity_granularity_1), 0},
+	{offsetof(struct acpi_battery, capacity_granularity_2), 0},
+	{offsetof(struct acpi_battery, model_number), 1},
+	{offsetof(struct acpi_battery, serial_number), 1},
+	{offsetof(struct acpi_battery, type), 1},
+	{offsetof(struct acpi_battery, oem_info), 1},
+};
 
+static int extract_package(struct acpi_battery *battery,
+			   union acpi_object *package,
+			   struct acpi_offsets *offsets, int num)
+{
+	int i, *x;
+	union acpi_object *element;
+	if (package->type != ACPI_TYPE_PACKAGE)
+		return -EFAULT;
+	for (i = 0; i < num; ++i) {
+		if (package->package.count <= i)
+			return -EFAULT;
+		element = &package->package.elements[i];
+		if (offsets[i].mode) {
+			if (element->type != ACPI_TYPE_STRING &&
+			    element->type != ACPI_TYPE_BUFFER)
+				return -EFAULT;
+			strncpy((u8 *)battery + offsets[i].offset,
+				element->string.pointer, 32);
+		} else {
+			if (element->type != ACPI_TYPE_INTEGER)
+				return -EFAULT;
+			x = (int *)((u8 *)battery + offsets[i].offset);
+			*x = element->integer.value;
+		}
+	}
 	return 0;
 }
 
 static int acpi_battery_get_status(struct acpi_battery *battery)
 {
-	int result = 0;
-
-	result = acpi_bus_get_status(battery->device);
-	if (result) {
+	if (acpi_bus_get_status(battery->device)) {
 		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 		return -ENODEV;
 	}
-	return result;
+	return 0;
 }
 
 static int acpi_battery_get_info(struct acpi_battery *battery)
 {
-	int result = 0;
+	int result = -EFAULT;
 	acpi_status status = 0;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-	struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),
-		ACPI_BATTERY_FORMAT_BIF
-	};
-	union acpi_object *package = NULL;
-	struct acpi_buffer *data = NULL;
-	struct acpi_battery_info *bif = NULL;
-
-	battery->update_time[ACPI_BATTERY_INFO] = get_seconds();
 
 	if (!acpi_battery_present(battery))
 		return 0;
+	mutex_lock(&battery->lock);
+	status = acpi_evaluate_object(battery->device->handle, "_BIF",
+				      NULL, &buffer);
+	mutex_unlock(&battery->lock);
 
-	/* Evaluate _BIF */
-
-	status =
-	    acpi_evaluate_object(acpi_battery_handle(battery), "_BIF", NULL,
-				 &buffer);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 		return -ENODEV;
 	}
 
-	package = buffer.pointer;
-
-	data = &battery->bif_data;
-
-	/* Extract Package Data */
-
-	result =
-	    acpi_battery_extract_package(battery, package, &format, data,
-					 "_BIF");
-	if (result)
-		goto end;
-
-      end:
-
+	result = extract_package(battery, buffer.pointer,
+				 info_offsets, ARRAY_SIZE(info_offsets));
 	kfree(buffer.pointer);
-
-	if (!result) {
-		bif = data->pointer;
-		battery->flags.power_unit = bif->power_unit;
-	}
-
 	return result;
 }
 
@@ -273,342 +319,203 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
 	int result = 0;
 	acpi_status status = 0;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-	struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),
-		ACPI_BATTERY_FORMAT_BST
-	};
-	union acpi_object *package = NULL;
-	struct acpi_buffer *data = NULL;
-
-	battery->update_time[ACPI_BATTERY_STATE] = get_seconds();
 
 	if (!acpi_battery_present(battery))
 		return 0;
 
-	/* Evaluate _BST */
+	if (battery->update_time &&
+	    time_before(jiffies, battery->update_time +
+			msecs_to_jiffies(cache_time)))
+		return 0;
+
+	mutex_lock(&battery->lock);
+	status = acpi_evaluate_object(battery->device->handle, "_BST",
+				      NULL, &buffer);
+	mutex_unlock(&battery->lock);
 
-	status =
-	    acpi_evaluate_object(acpi_battery_handle(battery), "_BST", NULL,
-				 &buffer);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 		return -ENODEV;
 	}
 
-	package = buffer.pointer;
-
-	data = &battery->bst_data;
-
-	/* Extract Package Data */
-
-	result =
-	    acpi_battery_extract_package(battery, package, &format, data,
-					 "_BST");
-	if (result)
-		goto end;
-
-      end:
+	result = extract_package(battery, buffer.pointer,
+				 state_offsets, ARRAY_SIZE(state_offsets));
+	battery->update_time = jiffies;
 	kfree(buffer.pointer);
-
 	return result;
 }
 
-static int acpi_battery_get_alarm(struct acpi_battery *battery)
-{
-	battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
-
-	return 0;
-}
-
-static int acpi_battery_set_alarm(struct acpi_battery *battery,
-				  unsigned long alarm)
+static int acpi_battery_set_alarm(struct acpi_battery *battery)
 {
 	acpi_status status = 0;
-	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
+	union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 	struct acpi_object_list arg_list = { 1, &arg0 };
 
-	battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
-
-	if (!acpi_battery_present(battery))
+	if (!acpi_battery_present(battery)|| !battery->alarm_present)
 		return -ENODEV;
 
-	if (!battery->flags.alarm_present)
-		return -ENODEV;
-
-	arg0.integer.value = alarm;
+	arg0.integer.value = battery->alarm;
 
-	status =
-	    acpi_evaluate_object(acpi_battery_handle(battery), "_BTP",
+	mutex_lock(&battery->lock);
+	status = acpi_evaluate_object(battery->device->handle, "_BTP",
 				 &arg_list, NULL);
+	mutex_unlock(&battery->lock);
+
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
 
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
-
-	battery->alarm = alarm;
-
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 	return 0;
 }
 
 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 {
-	int result = 0;
 	acpi_status status = AE_OK;
 	acpi_handle handle = NULL;
-	struct acpi_battery_info *bif = battery->bif_data.pointer;
-	unsigned long alarm = battery->alarm;
 
 	/* See if alarms are supported, and if so, set default */
-
-	status = acpi_get_handle(acpi_battery_handle(battery), "_BTP", &handle);
-	if (ACPI_SUCCESS(status)) {
-		battery->flags.alarm_present = 1;
-		if (!alarm && bif) {
-			alarm = bif->design_capacity_warning;
-		}
-		result = acpi_battery_set_alarm(battery, alarm);
-		if (result)
-			goto end;
-	} else {
-		battery->flags.alarm_present = 0;
+	status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
+	if (ACPI_FAILURE(status)) {
+		battery->alarm_present = 0;
+		return 0;
 	}
-
-      end:
-
-	return result;
+	battery->alarm_present = 1;
+	if (!battery->alarm)
+		battery->alarm = battery->design_capacity_warning;
+	return acpi_battery_set_alarm(battery);
 }
 
-static int acpi_battery_init_update(struct acpi_battery *battery)
+static int acpi_battery_update(struct acpi_battery *battery)
 {
-	int result = 0;
-
-	result = acpi_battery_get_status(battery);
-	if (result)
+	int saved_present = acpi_battery_present(battery);
+	int result = acpi_battery_get_status(battery);
+	if (result || !acpi_battery_present(battery))
 		return result;
-
-	battery->flags.battery_present_prev = acpi_battery_present(battery);
-
-	if (acpi_battery_present(battery)) {
+	if (saved_present != acpi_battery_present(battery) ||
+	    !battery->update_time) {
+		battery->update_time = 0;
 		result = acpi_battery_get_info(battery);
 		if (result)
 			return result;
-		result = acpi_battery_get_state(battery);
-		if (result)
-			return result;
-
-		acpi_battery_init_alarm(battery);
-	}
-
-	return result;
-}
-
-static int acpi_battery_update(struct acpi_battery *battery,
-			       int update, int *update_result_ptr)
-{
-	int result = 0;
-	int update_result = ACPI_BATTERY_NONE_UPDATE;
-
-	if (!acpi_battery_present(battery)) {
-		update = 1;
-	}
-
-	if (battery->flags.init_update) {
-		result = acpi_battery_init_update(battery);
-		if (result)
-			goto end;
-		update_result = ACPI_BATTERY_INIT_UPDATE;
-	} else if (update) {
-		result = acpi_battery_get_status(battery);
-		if (result)
-			goto end;
-		if ((!battery->flags.battery_present_prev & acpi_battery_present(battery))
-		    || (battery->flags.battery_present_prev & !acpi_battery_present(battery))) {
-			result = acpi_battery_init_update(battery);
-			if (result)
-				goto end;
-			update_result = ACPI_BATTERY_INIT_UPDATE;
+		if (battery->power_unit) {
+			battery->bat.properties = charge_battery_props;
+			battery->bat.num_properties =
+				ARRAY_SIZE(charge_battery_props);
 		} else {
-			update_result = ACPI_BATTERY_EASY_UPDATE;
+			battery->bat.properties = energy_battery_props;
+			battery->bat.num_properties =
+				ARRAY_SIZE(energy_battery_props);
 		}
+		acpi_battery_init_alarm(battery);
 	}
-
-      end:
-
-	battery->flags.init_update = (result != 0);
-
-	*update_result_ptr = update_result;
-
-	return result;
-}
-
-static void acpi_battery_notify_update(struct acpi_battery *battery)
-{
-	acpi_battery_get_status(battery);
-
-	if (battery->flags.init_update) {
-		return;
-	}
-
-	if ((!battery->flags.battery_present_prev &
-	     acpi_battery_present(battery)) ||
-	    (battery->flags.battery_present_prev &
-	     !acpi_battery_present(battery))) {
-		battery->flags.init_update = 1;
-	} else {
-		battery->flags.update[ACPI_BATTERY_INFO] = 1;
-		battery->flags.update[ACPI_BATTERY_STATE] = 1;
-		battery->flags.update[ACPI_BATTERY_ALARM] = 1;
-	}
+	return acpi_battery_get_state(battery);
 }
 
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
 
+#ifdef CONFIG_ACPI_PROCFS
 static struct proc_dir_entry *acpi_battery_dir;
 
 static int acpi_battery_print_info(struct seq_file *seq, int result)
 {
 	struct acpi_battery *battery = seq->private;
-	struct acpi_battery_info *bif = NULL;
-	char *units = "?";
 
 	if (result)
 		goto end;
 
-	if (acpi_battery_present(battery))
-		seq_printf(seq, "present:                 yes\n");
-	else {
-		seq_printf(seq, "present:                 no\n");
-		goto end;
-	}
-
-	bif = battery->bif_data.pointer;
-	if (!bif) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BIF buffer is NULL"));
-		result = -ENODEV;
+	seq_printf(seq, "present:                 %s\n",
+		   acpi_battery_present(battery)?"yes":"no");
+	if (!acpi_battery_present(battery))
 		goto end;
-	}
-
-	/* Battery Units */
-
-	units = acpi_battery_power_units(battery);
-
-	if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+	if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "design capacity:         unknown\n");
 	else
 		seq_printf(seq, "design capacity:         %d %sh\n",
-			   (u32) bif->design_capacity, units);
+			   battery->design_capacity,
+			   acpi_battery_units(battery));
 
-	if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+	if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "last full capacity:      unknown\n");
 	else
 		seq_printf(seq, "last full capacity:      %d %sh\n",
-			   (u32) bif->last_full_capacity, units);
+			   battery->full_charge_capacity,
+			   acpi_battery_units(battery));
 
-	switch ((u32) bif->battery_technology) {
-	case 0:
-		seq_printf(seq, "battery technology:      non-rechargeable\n");
-		break;
-	case 1:
-		seq_printf(seq, "battery technology:      rechargeable\n");
-		break;
-	default:
-		seq_printf(seq, "battery technology:      unknown\n");
-		break;
-	}
+	seq_printf(seq, "battery technology:      %srechargeable\n",
+		   (!battery->technology)?"non-":"");
 
-	if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+	if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "design voltage:          unknown\n");
 	else
 		seq_printf(seq, "design voltage:          %d mV\n",
-			   (u32) bif->design_voltage);
+			   battery->design_voltage);
 	seq_printf(seq, "design capacity warning: %d %sh\n",
-		   (u32) bif->design_capacity_warning, units);
+		   battery->design_capacity_warning,
+		   acpi_battery_units(battery));
 	seq_printf(seq, "design capacity low:     %d %sh\n",
-		   (u32) bif->design_capacity_low, units);
+		   battery->design_capacity_low,
+		   acpi_battery_units(battery));
 	seq_printf(seq, "capacity granularity 1:  %d %sh\n",
-		   (u32) bif->battery_capacity_granularity_1, units);
+		   battery->capacity_granularity_1,
+		   acpi_battery_units(battery));
 	seq_printf(seq, "capacity granularity 2:  %d %sh\n",
-		   (u32) bif->battery_capacity_granularity_2, units);
-	seq_printf(seq, "model number:            %s\n", bif->model_number);
-	seq_printf(seq, "serial number:           %s\n", bif->serial_number);
-	seq_printf(seq, "battery type:            %s\n", bif->battery_type);
-	seq_printf(seq, "OEM info:                %s\n", bif->oem_info);
-
+		   battery->capacity_granularity_2,
+		   acpi_battery_units(battery));
+	seq_printf(seq, "model number:            %s\n", battery->model_number);
+	seq_printf(seq, "serial number:           %s\n", battery->serial_number);
+	seq_printf(seq, "battery type:            %s\n", battery->type);
+	seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
       end:
-
 	if (result)
 		seq_printf(seq, "ERROR: Unable to read battery info\n");
-
 	return result;
 }
 
 static int acpi_battery_print_state(struct seq_file *seq, int result)
 {
 	struct acpi_battery *battery = seq->private;
-	struct acpi_battery_state *bst = NULL;
-	char *units = "?";
 
 	if (result)
 		goto end;
 
-	if (acpi_battery_present(battery))
-		seq_printf(seq, "present:                 yes\n");
-	else {
-		seq_printf(seq, "present:                 no\n");
-		goto end;
-	}
-
-	bst = battery->bst_data.pointer;
-	if (!bst) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BST buffer is NULL"));
-		result = -ENODEV;
+	seq_printf(seq, "present:                 %s\n",
+		   acpi_battery_present(battery)?"yes":"no");
+	if (!acpi_battery_present(battery))
 		goto end;
-	}
-
-	/* Battery Units */
-
-	units = acpi_battery_power_units(battery);
-
-	if (!(bst->state & 0x04))
-		seq_printf(seq, "capacity state:          ok\n");
-	else
-		seq_printf(seq, "capacity state:          critical\n");
 
-	if ((bst->state & 0x01) && (bst->state & 0x02)) {
+	seq_printf(seq, "capacity state:          %s\n",
+			(battery->state & 0x04)?"critical":"ok");
+	if ((battery->state & 0x01) && (battery->state & 0x02))
 		seq_printf(seq,
 			   "charging state:          charging/discharging\n");
-	} else if (bst->state & 0x01)
+	else if (battery->state & 0x01)
 		seq_printf(seq, "charging state:          discharging\n");
-	else if (bst->state & 0x02)
+	else if (battery->state & 0x02)
 		seq_printf(seq, "charging state:          charging\n");
-	else {
+	else
 		seq_printf(seq, "charging state:          charged\n");
-	}
 
-	if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
+	if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "present rate:            unknown\n");
 	else
 		seq_printf(seq, "present rate:            %d %s\n",
-			   (u32) bst->present_rate, units);
+			   battery->current_now, acpi_battery_units(battery));
 
-	if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+	if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "remaining capacity:      unknown\n");
 	else
 		seq_printf(seq, "remaining capacity:      %d %sh\n",
-			   (u32) bst->remaining_capacity, units);
-
-	if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+			   battery->capacity_now, acpi_battery_units(battery));
+	if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "present voltage:         unknown\n");
 	else
 		seq_printf(seq, "present voltage:         %d mV\n",
-			   (u32) bst->present_voltage);
-
+			   battery->voltage_now);
       end:
-
-	if (result) {
+	if (result)
 		seq_printf(seq, "ERROR: Unable to read battery state\n");
-	}
 
 	return result;
 }
@@ -616,7 +523,6 @@ static int acpi_battery_print_state(struct seq_file *seq, int result)
 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 {
 	struct acpi_battery *battery = seq->private;
-	char *units = "?";
 
 	if (result)
 		goto end;
@@ -625,189 +531,121 @@ static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 		seq_printf(seq, "present:                 no\n");
 		goto end;
 	}
-
-	/* Battery Units */
-
-	units = acpi_battery_power_units(battery);
-
 	seq_printf(seq, "alarm:                   ");
 	if (!battery->alarm)
 		seq_printf(seq, "unsupported\n");
 	else
-		seq_printf(seq, "%lu %sh\n", battery->alarm, units);
-
+		seq_printf(seq, "%u %sh\n", battery->alarm,
+				acpi_battery_units(battery));
       end:
-
 	if (result)
 		seq_printf(seq, "ERROR: Unable to read battery alarm\n");
-
 	return result;
 }
 
-static ssize_t
-acpi_battery_write_alarm(struct file *file,
-			 const char __user * buffer,
-			 size_t count, loff_t * ppos)
+static ssize_t acpi_battery_write_alarm(struct file *file,
+					const char __user * buffer,
+					size_t count, loff_t * ppos)
 {
 	int result = 0;
 	char alarm_string[12] = { '\0' };
 	struct seq_file *m = file->private_data;
 	struct acpi_battery *battery = m->private;
-	int update_result = ACPI_BATTERY_NONE_UPDATE;
 
 	if (!battery || (count > sizeof(alarm_string) - 1))
 		return -EINVAL;
-
-	mutex_lock(&battery->mutex);
-
-	result = acpi_battery_update(battery, 1, &update_result);
 	if (result) {
 		result = -ENODEV;
 		goto end;
 	}
-
 	if (!acpi_battery_present(battery)) {
 		result = -ENODEV;
 		goto end;
 	}
-
 	if (copy_from_user(alarm_string, buffer, count)) {
 		result = -EFAULT;
 		goto end;
 	}
-
 	alarm_string[count] = '\0';
-
-	result = acpi_battery_set_alarm(battery,
-					simple_strtoul(alarm_string, NULL, 0));
-	if (result)
-		goto end;
-
+	battery->alarm = simple_strtol(alarm_string, NULL, 0);
+	result = acpi_battery_set_alarm(battery);
       end:
-
-	acpi_battery_check_result(battery, result);
-
 	if (!result)
-		result = count;
-
-	mutex_unlock(&battery->mutex);
-
+		return count;
 	return result;
 }
 
 typedef int(*print_func)(struct seq_file *seq, int result);
-typedef int(*get_func)(struct acpi_battery *battery);
-
-static struct acpi_read_mux {
-	print_func print;
-	get_func get;
-} acpi_read_funcs[ACPI_BATTERY_NUMFILES] = {
-	{.get = acpi_battery_get_info, .print = acpi_battery_print_info},
-	{.get = acpi_battery_get_state, .print = acpi_battery_print_state},
-	{.get = acpi_battery_get_alarm, .print = acpi_battery_print_alarm},
+
+static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
+	acpi_battery_print_info,
+	acpi_battery_print_state,
+	acpi_battery_print_alarm,
 };
 
 static int acpi_battery_read(int fid, struct seq_file *seq)
 {
 	struct acpi_battery *battery = seq->private;
-	int result = 0;
-	int update_result = ACPI_BATTERY_NONE_UPDATE;
-	int update = 0;
-
-	mutex_lock(&battery->mutex);
-
-	update = (get_seconds() - battery->update_time[fid] >= update_time);
-	update = (update | battery->flags.update[fid]);
-
-	result = acpi_battery_update(battery, update, &update_result);
-	if (result)
-		goto end;
-
-	if (update_result == ACPI_BATTERY_EASY_UPDATE) {
-		result = acpi_read_funcs[fid].get(battery);
-		if (result)
-			goto end;
+	int result = acpi_battery_update(battery);
+	return acpi_print_funcs[fid](seq, result);
+}
+
+#define DECLARE_FILE_FUNCTIONS(_name) \
+static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
+{ \
+	return acpi_battery_read(_name##_tag, seq); \
+} \
+static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
+{ \
+	return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
+}
+
+DECLARE_FILE_FUNCTIONS(info);
+DECLARE_FILE_FUNCTIONS(state);
+DECLARE_FILE_FUNCTIONS(alarm);
+
+#undef DECLARE_FILE_FUNCTIONS
+
+#define FILE_DESCRIPTION_RO(_name) \
+	{ \
+	.name = __stringify(_name), \
+	.mode = S_IRUGO, \
+	.ops = { \
+		.open = acpi_battery_##_name##_open_fs, \
+		.read = seq_read, \
+		.llseek = seq_lseek, \
+		.release = single_release, \
+		.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define FILE_DESCRIPTION_RW(_name) \
+	{ \
+	.name = __stringify(_name), \
+	.mode = S_IFREG | S_IRUGO | S_IWUSR, \
+	.ops = { \
+		.open = acpi_battery_##_name##_open_fs, \
+		.read = seq_read, \
+		.llseek = seq_lseek, \
+		.write = acpi_battery_write_##_name, \
+		.release = single_release, \
+		.owner = THIS_MODULE, \
+		}, \
 	}
 
-      end:
-	result = acpi_read_funcs[fid].print(seq, result);
-	acpi_battery_check_result(battery, result);
-	battery->flags.update[fid] = result;
-	mutex_unlock(&battery->mutex);
-	return result;
-}
-
-static int acpi_battery_read_info(struct seq_file *seq, void *offset)
-{
-	return acpi_battery_read(ACPI_BATTERY_INFO, seq);
-}
-
-static int acpi_battery_read_state(struct seq_file *seq, void *offset)
-{
-	return acpi_battery_read(ACPI_BATTERY_STATE, seq);
-}
-
-static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
-{
-	return acpi_battery_read(ACPI_BATTERY_ALARM, seq);
-}
-
-static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
-{
-	return single_open(file, acpi_battery_read_info, PDE(inode)->data);
-}
-
-static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
-{
-	return single_open(file, acpi_battery_read_state, PDE(inode)->data);
-}
-
-static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
-{
-	return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
-}
-
 static struct battery_file {
 	struct file_operations ops;
 	mode_t mode;
 	char *name;
 } acpi_battery_file[] = {
-	{
-	.name = "info",
-	.mode = S_IRUGO,
-	.ops = {
-	.open = acpi_battery_info_open_fs,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-	.owner = THIS_MODULE,
-	},
-	},
-	{
-	.name = "state",
-	.mode = S_IRUGO,
-	.ops = {
-	.open = acpi_battery_state_open_fs,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-	.owner = THIS_MODULE,
-	},
-	},
-	{
-	.name = "alarm",
-	.mode = S_IFREG | S_IRUGO | S_IWUSR,
-	.ops = {
-	.open = acpi_battery_alarm_open_fs,
-	.read = seq_read,
-	.write = acpi_battery_write_alarm,
-	.llseek = seq_lseek,
-	.release = single_release,
-	.owner = THIS_MODULE,
-	},
-	},
+	FILE_DESCRIPTION_RO(info),
+	FILE_DESCRIPTION_RO(state),
+	FILE_DESCRIPTION_RW(alarm),
 };
 
+#undef FILE_DESCRIPTION_RO
+#undef FILE_DESCRIPTION_RW
+
 static int acpi_battery_add_fs(struct acpi_device *device)
 {
 	struct proc_dir_entry *entry = NULL;
@@ -832,25 +670,51 @@ static int acpi_battery_add_fs(struct acpi_device *device)
 			entry->owner = THIS_MODULE;
 		}
 	}
-
 	return 0;
 }
 
-static int acpi_battery_remove_fs(struct acpi_device *device)
+static void acpi_battery_remove_fs(struct acpi_device *device)
 {
 	int i;
-	if (acpi_device_dir(device)) {
-		for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
-			remove_proc_entry(acpi_battery_file[i].name,
+	if (!acpi_device_dir(device))
+		return;
+	for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
+		remove_proc_entry(acpi_battery_file[i].name,
 				  acpi_device_dir(device));
-		}
-		remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
-		acpi_device_dir(device) = NULL;
-	}
 
-	return 0;
+	remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
+	acpi_device_dir(device) = NULL;
+}
+
+#endif
+
+static ssize_t acpi_battery_alarm_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+	return sprintf(buf, "%d\n", battery->alarm * 1000);
+}
+
+static ssize_t acpi_battery_alarm_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	unsigned long x;
+	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+	if (sscanf(buf, "%ld\n", &x) == 1)
+		battery->alarm = x/1000;
+	if (acpi_battery_present(battery))
+		acpi_battery_set_alarm(battery);
+	return count;
 }
 
+static struct device_attribute alarm_attr = {
+	.attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
+	.show = acpi_battery_alarm_show,
+	.store = acpi_battery_alarm_store,
+};
+
 /* --------------------------------------------------------------------------
                                  Driver Interface
    -------------------------------------------------------------------------- */
@@ -858,33 +722,17 @@ static int acpi_battery_remove_fs(struct acpi_device *device)
 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 {
 	struct acpi_battery *battery = data;
-	struct acpi_device *device = NULL;
-
+	struct acpi_device *device;
 	if (!battery)
 		return;
-
 	device = battery->device;
-
-	switch (event) {
-	case ACPI_BATTERY_NOTIFY_STATUS:
-	case ACPI_BATTERY_NOTIFY_INFO:
-	case ACPI_NOTIFY_BUS_CHECK:
-	case ACPI_NOTIFY_DEVICE_CHECK:
-		device = battery->device;
-		acpi_battery_notify_update(battery);
-		acpi_bus_generate_proc_event(device, event,
+	acpi_battery_update(battery);
+	acpi_bus_generate_proc_event(device, event,
+				     acpi_battery_present(battery));
+	acpi_bus_generate_netlink_event(device->pnp.device_class,
+					device->dev.bus_id, event,
 					acpi_battery_present(battery));
-		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  device->dev.bus_id, event,
-						  acpi_battery_present(battery));
-		break;
-	default:
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "Unsupported event [0x%x]\n", event));
-		break;
-	}
-
-	return;
+	kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 }
 
 static int acpi_battery_add(struct acpi_device *device)
@@ -892,33 +740,27 @@ static int acpi_battery_add(struct acpi_device *device)
 	int result = 0;
 	acpi_status status = 0;
 	struct acpi_battery *battery = NULL;
-
 	if (!device)
 		return -EINVAL;
-
 	battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 	if (!battery)
 		return -ENOMEM;
-
-	mutex_init(&battery->mutex);
-
-	mutex_lock(&battery->mutex);
-
 	battery->device = device;
 	strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 	acpi_driver_data(device) = battery;
-
-	result = acpi_battery_get_status(battery);
-	if (result)
-		goto end;
-
-	battery->flags.init_update = 1;
-
+	mutex_init(&battery->lock);
+	acpi_battery_update(battery);
+#ifdef CONFIG_ACPI_PROCFS
 	result = acpi_battery_add_fs(device);
 	if (result)
 		goto end;
-
+#endif
+	battery->bat.name = acpi_device_bid(device);
+	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+	battery->bat.get_property = acpi_battery_get_property;
+	result = power_supply_register(&battery->device->dev, &battery->bat);
+	result = device_create_file(battery->bat.dev, &alarm_attr);
 	status = acpi_install_notify_handler(device->handle,
 					     ACPI_ALL_NOTIFY,
 					     acpi_battery_notify, battery);
@@ -927,20 +769,16 @@ static int acpi_battery_add(struct acpi_device *device)
 		result = -ENODEV;
 		goto end;
 	}
-
 	printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 	       ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 	       device->status.battery_present ? "present" : "absent");
-
       end:
-
 	if (result) {
+#ifdef CONFIG_ACPI_PROCFS
 		acpi_battery_remove_fs(device);
+#endif
 		kfree(battery);
 	}
-
-	mutex_unlock(&battery->mutex);
-
 	return result;
 }
 
@@ -951,27 +789,19 @@ static int acpi_battery_remove(struct acpi_device *device, int type)
 
 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;
-
 	battery = acpi_driver_data(device);
-
-	mutex_lock(&battery->mutex);
-
 	status = acpi_remove_notify_handler(device->handle,
 					    ACPI_ALL_NOTIFY,
 					    acpi_battery_notify);
-
+#ifdef CONFIG_ACPI_PROCFS
 	acpi_battery_remove_fs(device);
-
-	kfree(battery->bif_data.pointer);
-
-	kfree(battery->bst_data.pointer);
-
-	mutex_unlock(&battery->mutex);
-
-	mutex_destroy(&battery->mutex);
-
+#endif
+	if (battery->bat.dev) {
+		device_remove_file(battery->bat.dev, &alarm_attr);
+		power_supply_unregister(&battery->bat);
+	}
+	mutex_destroy(&battery->lock);
 	kfree(battery);
-
 	return 0;
 }
 
@@ -979,44 +809,48 @@ static int acpi_battery_remove(struct acpi_device *device, int type)
 static int acpi_battery_resume(struct acpi_device *device)
 {
 	struct acpi_battery *battery;
-
 	if (!device)
 		return -EINVAL;
-
-	battery = device->driver_data;
-
-	battery->flags.init_update = 1;
-
+	battery = acpi_driver_data(device);
+	battery->update_time = 0;
 	return 0;
 }
 
+static struct acpi_driver acpi_battery_driver = {
+	.name = "battery",
+	.class = ACPI_BATTERY_CLASS,
+	.ids = battery_device_ids,
+	.ops = {
+		.add = acpi_battery_add,
+		.resume = acpi_battery_resume,
+		.remove = acpi_battery_remove,
+		},
+};
+
 static int __init acpi_battery_init(void)
 {
-	int result;
-
 	if (acpi_disabled)
 		return -ENODEV;
-
+#ifdef CONFIG_ACPI_PROCFS
 	acpi_battery_dir = acpi_lock_battery_dir();
 	if (!acpi_battery_dir)
 		return -ENODEV;
-
-	result = acpi_bus_register_driver(&acpi_battery_driver);
-	if (result < 0) {
+#endif
+	if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
+#ifdef CONFIG_ACPI_PROCFS
 		acpi_unlock_battery_dir(acpi_battery_dir);
+#endif
 		return -ENODEV;
 	}
-
 	return 0;
 }
 
 static void __exit acpi_battery_exit(void)
 {
 	acpi_bus_unregister_driver(&acpi_battery_driver);
-
+#ifdef CONFIG_ACPI_PROCFS
 	acpi_unlock_battery_dir(acpi_battery_dir);
-
-	return;
+#endif
 }
 
 module_init(acpi_battery_init);
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index cbfc815..fb2cff9 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -286,15 +286,11 @@ DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 
 extern int event_is_open;
 
-int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
+int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 {
-	struct acpi_bus_event *event = NULL;
+	struct acpi_bus_event *event;
 	unsigned long flags = 0;
 
-
-	if (!device)
-		return -EINVAL;
-
 	/* drop event on the floor if no one's listening */
 	if (!event_is_open)
 		return 0;
@@ -303,8 +299,8 @@ int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 	if (!event)
 		return -ENOMEM;
 
-	strcpy(event->device_class, device->pnp.device_class);
-	strcpy(event->bus_id, device->pnp.bus_id);
+	strcpy(event->device_class, device_class);
+	strcpy(event->bus_id, bus_id);
 	event->type = type;
 	event->data = data;
 
@@ -315,6 +311,17 @@ int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 	wake_up_interruptible(&acpi_bus_event_queue);
 
 	return 0;
+
+}
+
+EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
+
+int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
+{
+	if (!device)
+		return -EINVAL;
+	return acpi_bus_generate_proc_event4(device->pnp.device_class,
+					     device->pnp.bus_id, type, data);
 }
 
 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 3f7935a..7b41783 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -121,6 +121,7 @@ static struct acpi_ec {
 	atomic_t event_count;
 	wait_queue_head_t wait;
 	struct list_head list;
+	u8 handlers_installed;
 } *boot_ec, *first_ec;
 
 /* --------------------------------------------------------------------------
@@ -425,7 +426,7 @@ int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
 	handler->func = func;
 	handler->data = data;
 	mutex_lock(&ec->lock);
-	list_add_tail(&handler->node, &ec->list);
+	list_add(&handler->node, &ec->list);
 	mutex_unlock(&ec->lock);
 	return 0;
 }
@@ -440,7 +441,6 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
 		if (query_bit == handler->query_bit) {
 			list_del(&handler->node);
 			kfree(handler);
-			break;
 		}
 	}
 	mutex_unlock(&ec->lock);
@@ -680,32 +680,50 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 	status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
 	if (ACPI_FAILURE(status))
 		return status;
-
 	/* Find and register all query methods */
 	acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
 			    acpi_ec_register_query_methods, ec, NULL);
-
 	/* Use the global lock for all EC transactions? */
 	acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
-
 	ec->handle = handle;
-
-	printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
-			  ec->gpe, ec->command_addr, ec->data_addr);
-
 	return AE_CTRL_TERMINATE;
 }
 
+static void ec_remove_handlers(struct acpi_ec *ec)
+{
+	if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
+				ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
+		printk(KERN_ERR PREFIX "failed to remove space handler\n");
+	if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
+				&acpi_ec_gpe_handler)))
+		printk(KERN_ERR PREFIX "failed to remove gpe handler\n");
+	ec->handlers_installed = 0;
+}
+
 static int acpi_ec_add(struct acpi_device *device)
 {
 	struct acpi_ec *ec = NULL;
 
 	if (!device)
 		return -EINVAL;
-
 	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 
+	/* Check for boot EC */
+	if (boot_ec) {
+		if (boot_ec->handle == device->handle) {
+			/* Pre-loaded EC from DSDT, just move pointer */
+			ec = boot_ec;
+			boot_ec = NULL;
+			goto end;
+		} else if (boot_ec->handle == ACPI_ROOT_OBJECT) {
+			/* ECDT-based EC, time to shut it down */
+			ec_remove_handlers(boot_ec);
+			kfree(boot_ec);
+			first_ec = boot_ec = NULL;
+		}
+	}
+
 	ec = make_acpi_ec();
 	if (!ec)
 		return -ENOMEM;
@@ -715,25 +733,14 @@ static int acpi_ec_add(struct acpi_device *device)
 		kfree(ec);
 		return -EINVAL;
 	}
-
-	/* Check if we found the boot EC */
-	if (boot_ec) {
-		if (boot_ec->gpe == ec->gpe) {
-			/* We might have incorrect info for GL at boot time */
-			mutex_lock(&boot_ec->lock);
-			boot_ec->global_lock = ec->global_lock;
-			/* Copy handlers from new ec into boot ec */
-			list_splice(&ec->list, &boot_ec->list);
-			mutex_unlock(&boot_ec->lock);
-			kfree(ec);
-			ec = boot_ec;
-		}
-	} else
-		first_ec = ec;
 	ec->handle = device->handle;
+      end:
+	if (!first_ec)
+		first_ec = ec;
 	acpi_driver_data(device) = ec;
-
 	acpi_ec_add_fs(device);
+	printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
+			  ec->gpe, ec->command_addr, ec->data_addr);
 	return 0;
 }
 
@@ -756,10 +763,7 @@ static int acpi_ec_remove(struct acpi_device *device, int type)
 	acpi_driver_data(device) = NULL;
 	if (ec == first_ec)
 		first_ec = NULL;
-
-	/* Don't touch boot EC */
-	if (boot_ec != ec)
-		kfree(ec);
+	kfree(ec);
 	return 0;
 }
 
@@ -789,6 +793,8 @@ ec_parse_io_ports(struct acpi_resource *resource, void *context)
 static int ec_install_handlers(struct acpi_ec *ec)
 {
 	acpi_status status;
+	if (ec->handlers_installed)
+		return 0;
 	status = acpi_install_gpe_handler(NULL, ec->gpe,
 					  ACPI_GPE_EDGE_TRIGGERED,
 					  &acpi_ec_gpe_handler, ec);
@@ -807,6 +813,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
 		return -ENODEV;
 	}
 
+	ec->handlers_installed = 1;
 	return 0;
 }
 
@@ -823,41 +830,22 @@ static int acpi_ec_start(struct acpi_device *device)
 	if (!ec)
 		return -EINVAL;
 
-	/* Boot EC is already working */
-	if (ec != boot_ec)
-		ret = ec_install_handlers(ec);
+	ret = ec_install_handlers(ec);
 
 	/* EC is fully operational, allow queries */
 	atomic_set(&ec->query_pending, 0);
-
 	return ret;
 }
 
 static int acpi_ec_stop(struct acpi_device *device, int type)
 {
-	acpi_status status;
 	struct acpi_ec *ec;
-
 	if (!device)
 		return -EINVAL;
-
 	ec = acpi_driver_data(device);
 	if (!ec)
 		return -EINVAL;
-
-	/* Don't touch boot EC */
-	if (ec == boot_ec)
-		return 0;
-
-	status = acpi_remove_address_space_handler(ec->handle,
-						   ACPI_ADR_SPACE_EC,
-						   &acpi_ec_space_handler);
-	if (ACPI_FAILURE(status))
-		return -ENODEV;
-
-	status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
-	if (ACPI_FAILURE(status))
-		return -ENODEV;
+	ec_remove_handlers(ec);
 
 	return 0;
 }
@@ -877,7 +865,7 @@ int __init acpi_ec_ecdt_probe(void)
 	status = acpi_get_table(ACPI_SIG_ECDT, 1,
 				(struct acpi_table_header **)&ecdt_ptr);
 	if (ACPI_SUCCESS(status)) {
-		printk(KERN_INFO PREFIX "EC description table is found, configuring boot EC\n\n");
+		printk(KERN_INFO PREFIX "EC description table is found, configuring boot EC\n");
 		boot_ec->command_addr = ecdt_ptr->control.address;
 		boot_ec->data_addr = ecdt_ptr->data.address;
 		boot_ec->gpe = ecdt_ptr->gpe;
@@ -899,7 +887,6 @@ int __init acpi_ec_ecdt_probe(void)
       error:
 	kfree(boot_ec);
 	boot_ec = NULL;
-
 	return -ENODEV;
 }
 
diff --git a/drivers/acpi/events/evevent.c b/drivers/acpi/events/evevent.c
index a1f87b5..e412878 100644
--- a/drivers/acpi/events/evevent.c
+++ b/drivers/acpi/events/evevent.c
@@ -239,10 +239,8 @@ u32 acpi_ev_fixed_event_detect(void)
 	 * Read the fixed feature status and enable registers, as all the cases
 	 * depend on their values.  Ignore errors here.
 	 */
-	(void)acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-				    ACPI_REGISTER_PM1_STATUS, &fixed_status);
-	(void)acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-				    ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
+	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
+	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 			  "Fixed Event Block: Enable %08X Status %08X\n",
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c
index 1d371fa..73f9c5f 100644
--- a/drivers/acpi/hardware/hwregs.c
+++ b/drivers/acpi/hardware/hwregs.c
@@ -75,8 +75,7 @@ acpi_status acpi_hw_clear_acpi_status(void)
 
 	lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
 
-	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-					ACPI_REGISTER_PM1_STATUS,
+	status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
 					ACPI_BITMASK_ALL_FIXED_STATUS);
 	if (ACPI_FAILURE(status)) {
 		goto unlock_and_exit;
@@ -259,7 +258,7 @@ struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
  *
  ******************************************************************************/
 
-acpi_status acpi_get_register(u32 register_id, u32 * return_value)
+acpi_status acpi_get_register_unlocked(u32 register_id, u32 * return_value)
 {
 	u32 register_value = 0;
 	struct acpi_bit_register_info *bit_reg_info;
@@ -276,8 +275,7 @@ acpi_status acpi_get_register(u32 register_id, u32 * return_value)
 
 	/* Read from the register */
 
-	status = acpi_hw_register_read(ACPI_MTX_LOCK,
-				       bit_reg_info->parent_register,
+	status = acpi_hw_register_read(bit_reg_info->parent_register,
 				       &register_value);
 
 	if (ACPI_SUCCESS(status)) {
@@ -298,6 +296,16 @@ acpi_status acpi_get_register(u32 register_id, u32 * return_value)
 	return_ACPI_STATUS(status);
 }
 
+acpi_status acpi_get_register(u32 register_id, u32 * return_value)
+{
+	acpi_status status;
+	acpi_cpu_flags flags;
+	flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
+	status = acpi_get_register_unlocked(register_id, return_value);
+	acpi_os_release_lock(acpi_gbl_hardware_lock, flags);
+	return status;
+}
+
 ACPI_EXPORT_SYMBOL(acpi_get_register)
 
 /*******************************************************************************
@@ -335,8 +343,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value)
 
 	/* Always do a register read first so we can insert the new bits  */
 
-	status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-				       bit_reg_info->parent_register,
+	status = acpi_hw_register_read(bit_reg_info->parent_register,
 				       &register_value);
 	if (ACPI_FAILURE(status)) {
 		goto unlock_and_exit;
@@ -363,8 +370,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value)
 						   bit_reg_info->
 						   access_bit_mask);
 		if (value) {
-			status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-							ACPI_REGISTER_PM1_STATUS,
+			status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
 							(u16) value);
 			register_value = 0;
 		}
@@ -377,8 +383,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value)
 					   bit_reg_info->access_bit_mask,
 					   value);
 
-		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-						ACPI_REGISTER_PM1_ENABLE,
+		status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,
 						(u16) register_value);
 		break;
 
@@ -397,15 +402,13 @@ acpi_status acpi_set_register(u32 register_id, u32 value)
 					   bit_reg_info->access_bit_mask,
 					   value);
 
-		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-						ACPI_REGISTER_PM1_CONTROL,
+		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
 						(u16) register_value);
 		break;
 
 	case ACPI_REGISTER_PM2_CONTROL:
 
-		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-					       ACPI_REGISTER_PM2_CONTROL,
+		status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,
 					       &register_value);
 		if (ACPI_FAILURE(status)) {
 			goto unlock_and_exit;
@@ -430,8 +433,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value)
 						     xpm2_control_block.
 						     address)));
 
-		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-						ACPI_REGISTER_PM2_CONTROL,
+		status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,
 						(u8) (register_value));
 		break;
 
@@ -461,8 +463,7 @@ ACPI_EXPORT_SYMBOL(acpi_set_register)
  *
  * FUNCTION:    acpi_hw_register_read
  *
- * PARAMETERS:  use_lock            - Lock hardware? True/False
- *              register_id         - ACPI Register ID
+ * PARAMETERS:  register_id         - ACPI Register ID
  *              return_value        - Where the register value is returned
  *
  * RETURN:      Status and the value read.
@@ -471,19 +472,14 @@ ACPI_EXPORT_SYMBOL(acpi_set_register)
  *
  ******************************************************************************/
 acpi_status
-acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
+acpi_hw_register_read(u32 register_id, u32 * return_value)
 {
 	u32 value1 = 0;
 	u32 value2 = 0;
 	acpi_status status;
-	acpi_cpu_flags lock_flags = 0;
 
 	ACPI_FUNCTION_TRACE(hw_register_read);
 
-	if (ACPI_MTX_LOCK == use_lock) {
-		lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-	}
-
 	switch (register_id) {
 	case ACPI_REGISTER_PM1_STATUS:	/* 16-bit access */
 
@@ -491,7 +487,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
 		    acpi_hw_low_level_read(16, &value1,
 					   &acpi_gbl_FADT.xpm1a_event_block);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		/* PM1B is optional */
@@ -507,7 +503,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
 		status =
 		    acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		/* PM1B is optional */
@@ -523,7 +519,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
 		    acpi_hw_low_level_read(16, &value1,
 					   &acpi_gbl_FADT.xpm1a_control_block);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		status =
@@ -558,10 +554,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
 		break;
 	}
 
-      unlock_and_exit:
-	if (ACPI_MTX_LOCK == use_lock) {
-		acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
-	}
+      exit:
 
 	if (ACPI_SUCCESS(status)) {
 		*return_value = value1;
@@ -574,8 +567,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
  *
  * FUNCTION:    acpi_hw_register_write
  *
- * PARAMETERS:  use_lock            - Lock hardware? True/False
- *              register_id         - ACPI Register ID
+ * PARAMETERS:  register_id         - ACPI Register ID
  *              Value               - The value to write
  *
  * RETURN:      Status
@@ -597,28 +589,22 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
  *
  ******************************************************************************/
 
-acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
+acpi_status acpi_hw_register_write(u32 register_id, u32 value)
 {
 	acpi_status status;
-	acpi_cpu_flags lock_flags = 0;
 	u32 read_value;
 
 	ACPI_FUNCTION_TRACE(hw_register_write);
 
-	if (ACPI_MTX_LOCK == use_lock) {
-		lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-	}
-
 	switch (register_id) {
 	case ACPI_REGISTER_PM1_STATUS:	/* 16-bit access */
 
 		/* Perform a read first to preserve certain bits (per ACPI spec) */
 
-		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-					       ACPI_REGISTER_PM1_STATUS,
+		status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS,
 					       &read_value);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		/* Insert the bits to be preserved */
@@ -632,7 +618,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 		    acpi_hw_low_level_write(16, value,
 					    &acpi_gbl_FADT.xpm1a_event_block);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		/* PM1B is optional */
@@ -647,7 +633,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 		status =
 		    acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		/* PM1B is optional */
@@ -661,11 +647,10 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 		/*
 		 * Perform a read first to preserve certain bits (per ACPI spec)
 		 */
-		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-					       ACPI_REGISTER_PM1_CONTROL,
+		status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 					       &read_value);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		/* Insert the bits to be preserved */
@@ -679,7 +664,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 		    acpi_hw_low_level_write(16, value,
 					    &acpi_gbl_FADT.xpm1a_control_block);
 		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
+			goto exit;
 		}
 
 		status =
@@ -728,11 +713,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 		break;
 	}
 
-      unlock_and_exit:
-	if (ACPI_MTX_LOCK == use_lock) {
-		acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
-	}
-
+      exit:
 	return_ACPI_STATUS(status);
 }
 
diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
index cf69c00..81b2484 100644
--- a/drivers/acpi/hardware/hwsleep.c
+++ b/drivers/acpi/hardware/hwsleep.c
@@ -234,15 +234,11 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 				"While executing method _SST"));
 	}
 
-	/*
-	 * 1) Disable/Clear all GPEs
-	 */
+	/* Disable/Clear all GPEs */
+
 	status = acpi_hw_disable_all_gpes();
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
 
-	return_ACPI_STATUS(AE_OK);
+	return_ACPI_STATUS(status);
 }
 
 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
@@ -313,8 +309,7 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 
 	/* Get current value of PM1A control */
 
-	status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-				       ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
+	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
@@ -341,15 +336,13 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 
 	/* Write #1: fill in SLP_TYP data */
 
-	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-					ACPI_REGISTER_PM1A_CONTROL,
+	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
 					PM1Acontrol);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-					ACPI_REGISTER_PM1B_CONTROL,
+	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
 					PM1Bcontrol);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
@@ -364,15 +357,13 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 
 	ACPI_FLUSH_CPU_CACHE();
 
-	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-					ACPI_REGISTER_PM1A_CONTROL,
+	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
 					PM1Acontrol);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-					ACPI_REGISTER_PM1B_CONTROL,
+	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
 					PM1Bcontrol);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
@@ -392,8 +383,7 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 		 */
 		acpi_os_stall(10000000);
 
-		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-						ACPI_REGISTER_PM1_CONTROL,
+		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
 						sleep_enable_reg_info->
 						access_bit_mask);
 		if (ACPI_FAILURE(status)) {
@@ -404,7 +394,8 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 	/* Wait until we enter sleep state */
 
 	do {
-		status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
+		status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
+						    &in_value);
 		if (ACPI_FAILURE(status)) {
 			return_ACPI_STATUS(status);
 		}
@@ -520,8 +511,7 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 
 		/* Get current value of PM1A control */
 
-		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
-					       ACPI_REGISTER_PM1_CONTROL,
+		status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 					       &PM1Acontrol);
 		if (ACPI_SUCCESS(status)) {
 
@@ -543,11 +533,9 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 
 			/* Just ignore any errors */
 
-			(void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-						     ACPI_REGISTER_PM1A_CONTROL,
+			(void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
 						     PM1Acontrol);
-			(void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
-						     ACPI_REGISTER_PM1B_CONTROL,
+			(void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
 						     PM1Bcontrol);
 		}
 	}
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 352cf81..aabc6ca 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1043,14 +1043,6 @@ static int __init acpi_wake_gpes_always_on_setup(char *str)
 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
 
 /*
- * max_cstate is defined in the base kernel so modules can
- * change it w/o depending on the state of the processor module.
- */
-unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
-
-EXPORT_SYMBOL(max_cstate);
-
-/*
  * Acquire a spinlock.
  *
  * handle is a pointer to the spinlock_t.
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 9f11dc2..a735108 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -44,6 +44,7 @@
 #include <linux/seq_file.h>
 #include <linux/dmi.h>
 #include <linux/moduleparam.h>
+#include <linux/cpuidle.h>
 
 #include <asm/io.h>
 #include <asm/system.h>
@@ -1049,11 +1050,13 @@ static int __init acpi_processor_init(void)
 		return -ENOMEM;
 	acpi_processor_dir->owner = THIS_MODULE;
 
+	result = cpuidle_register_driver(&acpi_idle_driver);
+	if (result < 0)
+		goto out_proc;
+
 	result = acpi_bus_register_driver(&acpi_processor_driver);
-	if (result < 0) {
-		remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
-		return result;
-	}
+	if (result < 0)
+		goto out_cpuidle;
 
 	acpi_processor_install_hotplug_notify();
 
@@ -1062,11 +1065,18 @@ static int __init acpi_processor_init(void)
 	acpi_processor_ppc_init();
 
 	return 0;
+
+out_cpuidle:
+	cpuidle_unregister_driver(&acpi_idle_driver);
+
+out_proc:
+	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+
+	return result;
 }
 
 static void __exit acpi_processor_exit(void)
 {
-
 	acpi_processor_ppc_exit();
 
 	acpi_thermal_cpufreq_exit();
@@ -1075,6 +1085,8 @@ static void __exit acpi_processor_exit(void)
 
 	acpi_bus_unregister_driver(&acpi_processor_driver);
 
+	cpuidle_unregister_driver(&acpi_idle_driver);
+
 	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 
 	return;
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 1f6fb38..f996d0e 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -40,6 +40,7 @@
 #include <linux/sched.h>	/* need_resched() */
 #include <linux/latency.h>
 #include <linux/clockchips.h>
+#include <linux/cpuidle.h>
 
 /*
  * Include the apic definitions for x86 to have the APIC timer related defines
@@ -64,14 +65,22 @@ ACPI_MODULE_NAME("processor_idle");
 #define ACPI_PROCESSOR_FILE_POWER	"power"
 #define US_TO_PM_TIMER_TICKS(t)		((t * (PM_TIMER_FREQUENCY/1000)) / 1000)
 #define PM_TIMER_TICK_NS		(1000000000ULL/PM_TIMER_FREQUENCY)
+#ifndef CONFIG_CPU_IDLE
 #define C2_OVERHEAD			4	/* 1us (3.579 ticks per us) */
 #define C3_OVERHEAD			4	/* 1us (3.579 ticks per us) */
 static void (*pm_idle_save) (void) __read_mostly;
-module_param(max_cstate, uint, 0644);
+#else
+#define C2_OVERHEAD			1	/* 1us */
+#define C3_OVERHEAD			1	/* 1us */
+#endif
+#define PM_TIMER_TICKS_TO_US(p)		(((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
 
+static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
+module_param(max_cstate, uint, 0000);
 static unsigned int nocst __read_mostly;
 module_param(nocst, uint, 0000);
 
+#ifndef CONFIG_CPU_IDLE
 /*
  * bm_history -- bit-mask with a bit per jiffy of bus-master activity
  * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms
@@ -82,9 +91,10 @@ module_param(nocst, uint, 0000);
 static unsigned int bm_history __read_mostly =
     (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));
 module_param(bm_history, uint, 0644);
-/* --------------------------------------------------------------------------
-                                Power Management
-   -------------------------------------------------------------------------- */
+
+static int acpi_processor_set_power_policy(struct acpi_processor *pr);
+
+#endif
 
 /*
  * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
@@ -177,6 +187,18 @@ static inline u32 ticks_elapsed(u32 t1, u32 t2)
 		return ((0xFFFFFFFF - t1) + t2);
 }
 
+static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2)
+{
+	if (t2 >= t1)
+		return PM_TIMER_TICKS_TO_US(t2 - t1);
+	else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
+		return PM_TIMER_TICKS_TO_US(((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
+	else
+		return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2);
+}
+
+#ifndef CONFIG_CPU_IDLE
+
 static void
 acpi_processor_power_activate(struct acpi_processor *pr,
 			      struct acpi_processor_cx *new)
@@ -248,6 +270,7 @@ static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
 		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
 	}
 }
+#endif /* !CONFIG_CPU_IDLE */
 
 #ifdef ARCH_APICTIMER_STOPS_ON_C3
 
@@ -330,6 +353,7 @@ int acpi_processor_resume(struct acpi_device * device)
 	return 0;
 }
 
+#ifndef CONFIG_CPU_IDLE
 static void acpi_processor_idle(void)
 {
 	struct acpi_processor *pr = NULL;
@@ -427,7 +451,7 @@ static void acpi_processor_idle(void)
 	 * an SMP system. We do it here instead of doing it at _CST/P_LVL
 	 * detection phase, to work cleanly with logical CPU hotplug.
 	 */
-	if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 
+	if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
 	    !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
 		cx = &pr->power.states[ACPI_STATE_C1];
 #endif
@@ -727,6 +751,7 @@ static int acpi_processor_set_power_policy(struct acpi_processor *pr)
 
 	return 0;
 }
+#endif /* !CONFIG_CPU_IDLE */
 
 static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
 {
@@ -744,7 +769,7 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
 #ifndef CONFIG_HOTPLUG_CPU
 	/*
 	 * Check for P_LVL2_UP flag before entering C2 and above on
-	 * an SMP system. 
+	 * an SMP system.
 	 */
 	if ((num_online_cpus() > 1) &&
 	    !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
@@ -945,7 +970,12 @@ static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
 	 * Normalize the C2 latency to expidite policy
 	 */
 	cx->valid = 1;
+
+#ifndef CONFIG_CPU_IDLE
 	cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
+#else
+	cx->latency_ticks = cx->latency;
+#endif
 
 	return;
 }
@@ -1025,7 +1055,12 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
 	 * use this in our C3 policy
 	 */
 	cx->valid = 1;
+
+#ifndef CONFIG_CPU_IDLE
 	cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
+#else
+	cx->latency_ticks = cx->latency;
+#endif
 
 	return;
 }
@@ -1090,6 +1125,7 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
 
 	pr->power.count = acpi_processor_power_verify(pr);
 
+#ifndef CONFIG_CPU_IDLE
 	/*
 	 * Set Default Policy
 	 * ------------------
@@ -1101,6 +1137,7 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
 	result = acpi_processor_set_power_policy(pr);
 	if (result)
 		return result;
+#endif
 
 	/*
 	 * if one state of type C2 or C3 is available, mark this
@@ -1117,35 +1154,6 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
 	return 0;
 }
 
-int acpi_processor_cst_has_changed(struct acpi_processor *pr)
-{
-	int result = 0;
-
-
-	if (!pr)
-		return -EINVAL;
-
-	if (nocst) {
-		return -ENODEV;
-	}
-
-	if (!pr->flags.power_setup_done)
-		return -ENODEV;
-
-	/* Fall back to the default idle loop */
-	pm_idle = pm_idle_save;
-	synchronize_sched();	/* Relies on interrupts forcing exit from idle. */
-
-	pr->flags.power = 0;
-	result = acpi_processor_get_power_info(pr);
-	if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
-		pm_idle = acpi_processor_idle;
-
-	return result;
-}
-
-/* proc interface */
-
 static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
 {
 	struct acpi_processor *pr = seq->private;
@@ -1227,6 +1235,35 @@ static const struct file_operations acpi_processor_power_fops = {
 	.release = single_release,
 };
 
+#ifndef CONFIG_CPU_IDLE
+
+int acpi_processor_cst_has_changed(struct acpi_processor *pr)
+{
+	int result = 0;
+
+
+	if (!pr)
+		return -EINVAL;
+
+	if (nocst) {
+		return -ENODEV;
+	}
+
+	if (!pr->flags.power_setup_done)
+		return -ENODEV;
+
+	/* Fall back to the default idle loop */
+	pm_idle = pm_idle_save;
+	synchronize_sched();	/* Relies on interrupts forcing exit from idle. */
+
+	pr->flags.power = 0;
+	result = acpi_processor_get_power_info(pr);
+	if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
+		pm_idle = acpi_processor_idle;
+
+	return result;
+}
+
 #ifdef CONFIG_SMP
 static void smp_callback(void *v)
 {
@@ -1249,7 +1286,366 @@ static int acpi_processor_latency_notify(struct notifier_block *b,
 static struct notifier_block acpi_processor_latency_notifier = {
 	.notifier_call = acpi_processor_latency_notify,
 };
+
+#endif
+
+#else /* CONFIG_CPU_IDLE */
+
+/**
+ * acpi_idle_bm_check - checks if bus master activity was detected
+ */
+static int acpi_idle_bm_check(void)
+{
+	u32 bm_status = 0;
+
+	acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
+	if (bm_status)
+		acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
+	/*
+	 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
+	 * the true state of bus mastering activity; forcing us to
+	 * manually check the BMIDEA bit of each IDE channel.
+	 */
+	else if (errata.piix4.bmisx) {
+		if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
+		    || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
+			bm_status = 1;
+	}
+	return bm_status;
+}
+
+/**
+ * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state
+ * @pr: the processor
+ * @target: the new target state
+ */
+static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr,
+					   struct acpi_processor_cx *target)
+{
+	if (pr->flags.bm_rld_set && target->type != ACPI_STATE_C3) {
+		acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
+		pr->flags.bm_rld_set = 0;
+	}
+
+	if (!pr->flags.bm_rld_set && target->type == ACPI_STATE_C3) {
+		acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
+		pr->flags.bm_rld_set = 1;
+	}
+}
+
+/**
+ * acpi_idle_do_entry - a helper function that does C2 and C3 type entry
+ * @cx: cstate data
+ */
+static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
+{
+	if (cx->space_id == ACPI_CSTATE_FFH) {
+		/* Call into architectural FFH based C-state */
+		acpi_processor_ffh_cstate_enter(cx);
+	} else {
+		int unused;
+		/* IO port based C-state */
+		inb(cx->address);
+		/* Dummy wait op - must do something useless after P_LVL2 read
+		   because chipsets cannot guarantee that STPCLK# signal
+		   gets asserted in time to freeze execution properly. */
+		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
+	}
+}
+
+/**
+ * acpi_idle_enter_c1 - enters an ACPI C1 state-type
+ * @dev: the target CPU
+ * @state: the state data
+ *
+ * This is equivalent to the HALT instruction.
+ */
+static int acpi_idle_enter_c1(struct cpuidle_device *dev,
+			      struct cpuidle_state *state)
+{
+	struct acpi_processor *pr;
+	struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
+	pr = processors[smp_processor_id()];
+
+	if (unlikely(!pr))
+		return 0;
+
+	if (pr->flags.bm_check)
+		acpi_idle_update_bm_rld(pr, cx);
+
+	current_thread_info()->status &= ~TS_POLLING;
+	/*
+	 * TS_POLLING-cleared state must be visible before we test
+	 * NEED_RESCHED:
+	 */
+	smp_mb();
+	if (!need_resched())
+		safe_halt();
+	current_thread_info()->status |= TS_POLLING;
+
+	cx->usage++;
+
+	return 0;
+}
+
+/**
+ * acpi_idle_enter_simple - enters an ACPI state without BM handling
+ * @dev: the target CPU
+ * @state: the state data
+ */
+static int acpi_idle_enter_simple(struct cpuidle_device *dev,
+				  struct cpuidle_state *state)
+{
+	struct acpi_processor *pr;
+	struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
+	u32 t1, t2;
+	pr = processors[smp_processor_id()];
+
+	if (unlikely(!pr))
+		return 0;
+
+	if (acpi_idle_suspend)
+		return(acpi_idle_enter_c1(dev, state));
+
+	if (pr->flags.bm_check)
+		acpi_idle_update_bm_rld(pr, cx);
+
+	local_irq_disable();
+	current_thread_info()->status &= ~TS_POLLING;
+	/*
+	 * TS_POLLING-cleared state must be visible before we test
+	 * NEED_RESCHED:
+	 */
+	smp_mb();
+
+	if (unlikely(need_resched())) {
+		current_thread_info()->status |= TS_POLLING;
+		local_irq_enable();
+		return 0;
+	}
+
+	if (cx->type == ACPI_STATE_C3)
+		ACPI_FLUSH_CPU_CACHE();
+
+	t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+	acpi_state_timer_broadcast(pr, cx, 1);
+	acpi_idle_do_entry(cx);
+	t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+	/* TSC could halt in idle, so notify users */
+	mark_tsc_unstable("TSC halts in idle");;
+#endif
+
+	local_irq_enable();
+	current_thread_info()->status |= TS_POLLING;
+
+	cx->usage++;
+
+	acpi_state_timer_broadcast(pr, cx, 0);
+	cx->time += ticks_elapsed(t1, t2);
+	return ticks_elapsed_in_us(t1, t2);
+}
+
+static int c3_cpu_count;
+static DEFINE_SPINLOCK(c3_lock);
+
+/**
+ * acpi_idle_enter_bm - enters C3 with proper BM handling
+ * @dev: the target CPU
+ * @state: the state data
+ *
+ * If BM is detected, the deepest non-C3 idle state is entered instead.
+ */
+static int acpi_idle_enter_bm(struct cpuidle_device *dev,
+			      struct cpuidle_state *state)
+{
+	struct acpi_processor *pr;
+	struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
+	u32 t1, t2;
+	pr = processors[smp_processor_id()];
+
+	if (unlikely(!pr))
+		return 0;
+
+	if (acpi_idle_suspend)
+		return(acpi_idle_enter_c1(dev, state));
+
+	local_irq_disable();
+	current_thread_info()->status &= ~TS_POLLING;
+	/*
+	 * TS_POLLING-cleared state must be visible before we test
+	 * NEED_RESCHED:
+	 */
+	smp_mb();
+
+	if (unlikely(need_resched())) {
+		current_thread_info()->status |= TS_POLLING;
+		local_irq_enable();
+		return 0;
+	}
+
+	/*
+	 * Must be done before busmaster disable as we might need to
+	 * access HPET !
+	 */
+	acpi_state_timer_broadcast(pr, cx, 1);
+
+	if (acpi_idle_bm_check()) {
+		cx = pr->power.bm_state;
+
+		acpi_idle_update_bm_rld(pr, cx);
+
+		t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+		acpi_idle_do_entry(cx);
+		t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+	} else {
+		acpi_idle_update_bm_rld(pr, cx);
+
+		spin_lock(&c3_lock);
+		c3_cpu_count++;
+		/* Disable bus master arbitration when all CPUs are in C3 */
+		if (c3_cpu_count == num_online_cpus())
+			acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
+		spin_unlock(&c3_lock);
+
+		t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+		acpi_idle_do_entry(cx);
+		t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+
+		spin_lock(&c3_lock);
+		/* Re-enable bus master arbitration */
+		if (c3_cpu_count == num_online_cpus())
+			acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
+		c3_cpu_count--;
+		spin_unlock(&c3_lock);
+	}
+
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+	/* TSC could halt in idle, so notify users */
+	mark_tsc_unstable("TSC halts in idle");
+#endif
+
+	local_irq_enable();
+	current_thread_info()->status |= TS_POLLING;
+
+	cx->usage++;
+
+	acpi_state_timer_broadcast(pr, cx, 0);
+	cx->time += ticks_elapsed(t1, t2);
+	return ticks_elapsed_in_us(t1, t2);
+}
+
+struct cpuidle_driver acpi_idle_driver = {
+	.name =		"acpi_idle",
+	.owner =	THIS_MODULE,
+};
+
+/**
+ * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
+ * @pr: the ACPI processor
+ */
+static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
+{
+	int i, count = 0;
+	struct acpi_processor_cx *cx;
+	struct cpuidle_state *state;
+	struct cpuidle_device *dev = &pr->power.dev;
+
+	if (!pr->flags.power_setup_done)
+		return -EINVAL;
+
+	if (pr->flags.power == 0) {
+		return -EINVAL;
+	}
+
+	for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
+		cx = &pr->power.states[i];
+		state = &dev->states[count];
+
+		if (!cx->valid)
+			continue;
+
+#ifdef CONFIG_HOTPLUG_CPU
+		if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
+		    !pr->flags.has_cst &&
+		    !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
+			continue;
 #endif
+		cpuidle_set_statedata(state, cx);
+
+		snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
+		state->exit_latency = cx->latency;
+		state->target_residency = cx->latency * 6;
+		state->power_usage = cx->power;
+
+		state->flags = 0;
+		switch (cx->type) {
+			case ACPI_STATE_C1:
+			state->flags |= CPUIDLE_FLAG_SHALLOW;
+			state->enter = acpi_idle_enter_c1;
+			break;
+
+			case ACPI_STATE_C2:
+			state->flags |= CPUIDLE_FLAG_BALANCED;
+			state->flags |= CPUIDLE_FLAG_TIME_VALID;
+			state->enter = acpi_idle_enter_simple;
+			break;
+
+			case ACPI_STATE_C3:
+			state->flags |= CPUIDLE_FLAG_DEEP;
+			state->flags |= CPUIDLE_FLAG_TIME_VALID;
+			state->flags |= CPUIDLE_FLAG_CHECK_BM;
+			state->enter = pr->flags.bm_check ?
+					acpi_idle_enter_bm :
+					acpi_idle_enter_simple;
+			break;
+		}
+
+		count++;
+	}
+
+	dev->state_count = count;
+
+	if (!count)
+		return -EINVAL;
+
+	/* find the deepest state that can handle active BM */
+	if (pr->flags.bm_check) {
+		for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++)
+			if (pr->power.states[i].type == ACPI_STATE_C3)
+				break;
+		pr->power.bm_state = &pr->power.states[i-1];
+	}
+
+	return 0;
+}
+
+int acpi_processor_cst_has_changed(struct acpi_processor *pr)
+{
+	int ret;
+
+	if (!pr)
+		return -EINVAL;
+
+	if (nocst) {
+		return -ENODEV;
+	}
+
+	if (!pr->flags.power_setup_done)
+		return -ENODEV;
+
+	cpuidle_pause_and_lock();
+	cpuidle_disable_device(&pr->power.dev);
+	acpi_processor_get_power_info(pr);
+	acpi_processor_setup_cpuidle(pr);
+	ret = cpuidle_enable_device(&pr->power.dev);
+	cpuidle_resume_and_unlock();
+
+	return ret;
+}
+
+#endif /* CONFIG_CPU_IDLE */
 
 int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 			      struct acpi_device *device)
@@ -1267,7 +1663,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 			       "ACPI: processor limited to max C-state %d\n",
 			       max_cstate);
 		first_run++;
-#ifdef CONFIG_SMP
+#if !defined (CONFIG_CPU_IDLE) && defined (CONFIG_SMP)
 		register_latency_notifier(&acpi_processor_latency_notifier);
 #endif
 	}
@@ -1285,6 +1681,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 	}
 
 	acpi_processor_get_power_info(pr);
+	pr->flags.power_setup_done = 1;
 
 	/*
 	 * Install the idle handler if processor power management is supported.
@@ -1292,6 +1689,13 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 	 * platforms that only support C1.
 	 */
 	if ((pr->flags.power) && (!boot_option_idle_override)) {
+#ifdef CONFIG_CPU_IDLE
+		acpi_processor_setup_cpuidle(pr);
+		pr->power.dev.cpu = pr->id;
+		if (cpuidle_register_device(&pr->power.dev))
+			return -EIO;
+#endif
+
 		printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
 		for (i = 1; i <= pr->power.count; i++)
 			if (pr->power.states[i].valid)
@@ -1299,10 +1703,12 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 				       pr->power.states[i].type);
 		printk(")\n");
 
+#ifndef CONFIG_CPU_IDLE
 		if (pr->id == 0) {
 			pm_idle_save = pm_idle;
 			pm_idle = acpi_processor_idle;
 		}
+#endif
 	}
 
 	/* 'power' [R] */
@@ -1316,21 +1722,24 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
 		entry->owner = THIS_MODULE;
 	}
 
-	pr->flags.power_setup_done = 1;
-
 	return 0;
 }
 
 int acpi_processor_power_exit(struct acpi_processor *pr,
 			      struct acpi_device *device)
 {
-
+#ifdef CONFIG_CPU_IDLE
+	if ((pr->flags.power) && (!boot_option_idle_override))
+		cpuidle_unregister_device(&pr->power.dev);
+#endif
 	pr->flags.power_setup_done = 0;
 
 	if (acpi_device_dir(device))
 		remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
 				  acpi_device_dir(device));
 
+#ifndef CONFIG_CPU_IDLE
+
 	/* Unregister the idle handler when processor #0 is removed. */
 	if (pr->id == 0) {
 		pm_idle = pm_idle_save;
@@ -1345,6 +1754,7 @@ int acpi_processor_power_exit(struct acpi_processor *pr,
 		unregister_latency_notifier(&acpi_processor_latency_notifier);
 #endif
 	}
+#endif
 
 	return 0;
 }
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index a578986..90fd09c 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -1,6 +1,8 @@
 /*
- *  acpi_sbs.c - ACPI Smart Battery System Driver ($Revision: 1.16 $)
+ *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
  *
+ *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
+ *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -26,15 +28,22 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
+
+#ifdef CONFIG_ACPI_PROCFS
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <asm/uaccess.h>
+#endif
+
 #include <linux/acpi.h>
 #include <linux/timer.h>
 #include <linux/jiffies.h>
 #include <linux/delay.h>
 
-#define ACPI_SBS_COMPONENT		0x00080000
+#include <linux/power_supply.h>
+
+#include "sbshc.h"
+
 #define ACPI_SBS_CLASS			"sbs"
 #define ACPI_AC_CLASS			"ac_adapter"
 #define ACPI_BATTERY_CLASS		"battery"
@@ -44,836 +53,436 @@
 #define ACPI_SBS_FILE_ALARM		"alarm"
 #define ACPI_BATTERY_DIR_NAME		"BAT%i"
 #define ACPI_AC_DIR_NAME		"AC0"
-#define ACPI_SBC_SMBUS_ADDR		0x9
-#define ACPI_SBSM_SMBUS_ADDR		0xa
-#define ACPI_SB_SMBUS_ADDR		0xb
-#define ACPI_SBS_AC_NOTIFY_STATUS	0x80
-#define ACPI_SBS_BATTERY_NOTIFY_STATUS	0x80
-#define ACPI_SBS_BATTERY_NOTIFY_INFO	0x81
 
-#define _COMPONENT			ACPI_SBS_COMPONENT
+enum acpi_sbs_device_addr {
+	ACPI_SBS_CHARGER = 0x9,
+	ACPI_SBS_MANAGER = 0xa,
+	ACPI_SBS_BATTERY = 0xb,
+};
 
-ACPI_MODULE_NAME("sbs");
+#define ACPI_SBS_NOTIFY_STATUS		0x80
+#define ACPI_SBS_NOTIFY_INFO		0x81
 
-MODULE_AUTHOR("Rich Townsend");
+MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
 MODULE_LICENSE("GPL");
 
-#define	xmsleep(t)	msleep(t)
-
-#define ACPI_EC_SMB_PRTCL	0x00	/* protocol, PEC */
-
-#define ACPI_EC_SMB_STS		0x01	/* status */
-#define ACPI_EC_SMB_ADDR	0x02	/* address */
-#define ACPI_EC_SMB_CMD		0x03	/* command */
-#define ACPI_EC_SMB_DATA	0x04	/* 32 data registers */
-#define ACPI_EC_SMB_BCNT	0x24	/* number of data bytes */
-
-#define ACPI_EC_SMB_STS_DONE	0x80
-#define ACPI_EC_SMB_STS_STATUS	0x1f
-
-#define ACPI_EC_SMB_PRTCL_WRITE		0x00
-#define ACPI_EC_SMB_PRTCL_READ		0x01
-#define ACPI_EC_SMB_PRTCL_WORD_DATA	0x08
-#define ACPI_EC_SMB_PRTCL_BLOCK_DATA	0x0a
-
-#define ACPI_EC_SMB_TRANSACTION_SLEEP	1
-#define ACPI_EC_SMB_ACCESS_SLEEP1	1
-#define ACPI_EC_SMB_ACCESS_SLEEP2	10
-
-#define	DEF_CAPACITY_UNIT	3
-#define	MAH_CAPACITY_UNIT	1
-#define	MWH_CAPACITY_UNIT	2
-#define	CAPACITY_UNIT		DEF_CAPACITY_UNIT
-
-#define	REQUEST_UPDATE_MODE	1
-#define	QUEUE_UPDATE_MODE	2
-
-#define	DATA_TYPE_COMMON	0
-#define	DATA_TYPE_INFO		1
-#define	DATA_TYPE_STATE		2
-#define	DATA_TYPE_ALARM		3
-#define	DATA_TYPE_AC_STATE	4
+static unsigned int cache_time = 1000;
+module_param(cache_time, uint, 0644);
+MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
 
 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
 
-#define	MAX_SBS_BAT			4
+#define MAX_SBS_BAT			4
 #define ACPI_SBS_BLOCK_MAX		32
 
-#define ACPI_SBS_SMBUS_READ		1
-#define ACPI_SBS_SMBUS_WRITE		2
-
-#define ACPI_SBS_WORD_DATA		1
-#define ACPI_SBS_BLOCK_DATA		2
-
-#define	UPDATE_DELAY	10
-
-/* 0 - every time, > 0 - by update_time */
-static unsigned int update_time = 120;
-
-static unsigned int capacity_mode = CAPACITY_UNIT;
-
-module_param(update_time, uint, 0644);
-module_param(capacity_mode, uint, 0444);
-
-static int acpi_sbs_add(struct acpi_device *device);
-static int acpi_sbs_remove(struct acpi_device *device, int type);
-static int acpi_sbs_resume(struct acpi_device *device);
-
 static const struct acpi_device_id sbs_device_ids[] = {
-	{"ACPI0001", 0},
-	{"ACPI0005", 0},
+	{"ACPI0002", 0},
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
 
-static struct acpi_driver acpi_sbs_driver = {
-	.name = "sbs",
-	.class = ACPI_SBS_CLASS,
-	.ids = sbs_device_ids,
-	.ops = {
-		.add = acpi_sbs_add,
-		.remove = acpi_sbs_remove,
-		.resume = acpi_sbs_resume,
-		},
-};
-
-struct acpi_ac {
-	int ac_present;
-};
-
-struct acpi_battery_info {
-	int capacity_mode;
-	s16 full_charge_capacity;
-	s16 design_capacity;
-	s16 design_voltage;
-	int vscale;
-	int ipscale;
-	s16 serial_number;
-	char manufacturer_name[ACPI_SBS_BLOCK_MAX + 3];
-	char device_name[ACPI_SBS_BLOCK_MAX + 3];
-	char device_chemistry[ACPI_SBS_BLOCK_MAX + 3];
-};
-
-struct acpi_battery_state {
-	s16 voltage;
-	s16 amperage;
-	s16 remaining_capacity;
-	s16 battery_state;
-};
-
-struct acpi_battery_alarm {
-	s16 remaining_capacity;
-};
-
 struct acpi_battery {
-	int alive;
-	int id;
-	int init_state;
-	int battery_present;
+	struct power_supply bat;
 	struct acpi_sbs *sbs;
-	struct acpi_battery_info info;
-	struct acpi_battery_state state;
-	struct acpi_battery_alarm alarm;
-	struct proc_dir_entry *battery_entry;
+#ifdef CONFIG_ACPI_PROCFS
+	struct proc_dir_entry *proc_entry;
+#endif
+	unsigned long update_time;
+	char name[8];
+	char manufacturer_name[ACPI_SBS_BLOCK_MAX];
+	char device_name[ACPI_SBS_BLOCK_MAX];
+	char device_chemistry[ACPI_SBS_BLOCK_MAX];
+	u16 alarm_capacity;
+	u16 full_charge_capacity;
+	u16 design_capacity;
+	u16 design_voltage;
+	u16 serial_number;
+	u16 cycle_count;
+	u16 temp_now;
+	u16 voltage_now;
+	s16 current_now;
+	s16 current_avg;
+	u16 capacity_now;
+	u16 state_of_charge;
+	u16 state;
+	u16 mode;
+	u16 spec;
+	u8 id;
+	u8 present:1;
 };
 
+#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
+
 struct acpi_sbs {
-	int base;
+	struct power_supply charger;
 	struct acpi_device *device;
-	struct mutex mutex;
-	int sbsm_present;
-	int sbsm_batteries_supported;
-	struct proc_dir_entry *ac_entry;
-	struct acpi_ac ac;
+	struct acpi_smb_hc *hc;
+	struct mutex lock;
+#ifdef CONFIG_ACPI_PROCFS
+	struct proc_dir_entry *charger_entry;
+#endif
 	struct acpi_battery battery[MAX_SBS_BAT];
-	int zombie;
-	struct timer_list update_timer;
-	int run_cnt;
-	int update_proc_flg;
+	u8 batteries_supported:4;
+	u8 manager_present:1;
+	u8 charger_present:1;
 };
 
-static int acpi_sbs_update_run(struct acpi_sbs *sbs, int id, int data_type);
-static void acpi_sbs_update_time(void *data);
+#define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 
-union sbs_rw_data {
-	u16 word;
-	u8 block[ACPI_SBS_BLOCK_MAX + 2];
-};
-
-static int acpi_ec_sbs_access(struct acpi_sbs *sbs, u16 addr,
-			      char read_write, u8 command, int size,
-			      union sbs_rw_data *data);
-
-/* --------------------------------------------------------------------------
-                               SMBus Communication
-   -------------------------------------------------------------------------- */
-
-static int acpi_ec_sbs_read(struct acpi_sbs *sbs, u8 address, u8 * data)
+static inline int battery_scale(int log)
 {
-	u8 val;
-	int err;
-
-	err = ec_read(sbs->base + address, &val);
-	if (!err) {
-		*data = val;
-	}
-	xmsleep(ACPI_EC_SMB_TRANSACTION_SLEEP);
-	return (err);
-}
-
-static int acpi_ec_sbs_write(struct acpi_sbs *sbs, u8 address, u8 data)
-{
-	int err;
-
-	err = ec_write(sbs->base + address, data);
-	return (err);
-}
-
-static int
-acpi_ec_sbs_access(struct acpi_sbs *sbs, u16 addr,
-		   char read_write, u8 command, int size,
-		   union sbs_rw_data *data)
-{
-	unsigned char protocol, len = 0, temp[2] = { 0, 0 };
-	int i;
-
-	if (read_write == ACPI_SBS_SMBUS_READ) {
-		protocol = ACPI_EC_SMB_PRTCL_READ;
-	} else {
-		protocol = ACPI_EC_SMB_PRTCL_WRITE;
-	}
-
-	switch (size) {
-
-	case ACPI_SBS_WORD_DATA:
-		acpi_ec_sbs_write(sbs, ACPI_EC_SMB_CMD, command);
-		if (read_write == ACPI_SBS_SMBUS_WRITE) {
-			acpi_ec_sbs_write(sbs, ACPI_EC_SMB_DATA, data->word);
-			acpi_ec_sbs_write(sbs, ACPI_EC_SMB_DATA + 1,
-					  data->word >> 8);
-		}
-		protocol |= ACPI_EC_SMB_PRTCL_WORD_DATA;
-		break;
-	case ACPI_SBS_BLOCK_DATA:
-		acpi_ec_sbs_write(sbs, ACPI_EC_SMB_CMD, command);
-		if (read_write == ACPI_SBS_SMBUS_WRITE) {
-			len = min_t(u8, data->block[0], 32);
-			acpi_ec_sbs_write(sbs, ACPI_EC_SMB_BCNT, len);
-			for (i = 0; i < len; i++)
-				acpi_ec_sbs_write(sbs, ACPI_EC_SMB_DATA + i,
-						  data->block[i + 1]);
-		}
-		protocol |= ACPI_EC_SMB_PRTCL_BLOCK_DATA;
-		break;
-	default:
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"unsupported transaction %d", size));
-		return (-1);
-	}
-
-	acpi_ec_sbs_write(sbs, ACPI_EC_SMB_ADDR, addr << 1);
-	acpi_ec_sbs_write(sbs, ACPI_EC_SMB_PRTCL, protocol);
-
-	acpi_ec_sbs_read(sbs, ACPI_EC_SMB_STS, temp);
-
-	if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
-		xmsleep(ACPI_EC_SMB_ACCESS_SLEEP1);
-		acpi_ec_sbs_read(sbs, ACPI_EC_SMB_STS, temp);
-	}
-	if (~temp[0] & ACPI_EC_SMB_STS_DONE) {
-		xmsleep(ACPI_EC_SMB_ACCESS_SLEEP2);
-		acpi_ec_sbs_read(sbs, ACPI_EC_SMB_STS, temp);
-	}
-	if ((~temp[0] & ACPI_EC_SMB_STS_DONE)
-	    || (temp[0] & ACPI_EC_SMB_STS_STATUS)) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"transaction %d error", size));
-		return (-1);
-	}
-
-	if (read_write == ACPI_SBS_SMBUS_WRITE) {
-		return (0);
-	}
-
-	switch (size) {
-
-	case ACPI_SBS_WORD_DATA:
-		acpi_ec_sbs_read(sbs, ACPI_EC_SMB_DATA, temp);
-		acpi_ec_sbs_read(sbs, ACPI_EC_SMB_DATA + 1, temp + 1);
-		data->word = (temp[1] << 8) | temp[0];
-		break;
-
-	case ACPI_SBS_BLOCK_DATA:
-		len = 0;
-		acpi_ec_sbs_read(sbs, ACPI_EC_SMB_BCNT, &len);
-		len = min_t(u8, len, 32);
-		for (i = 0; i < len; i++)
-			acpi_ec_sbs_read(sbs, ACPI_EC_SMB_DATA + i,
-					 data->block + i + 1);
-		data->block[0] = len;
-		break;
-	default:
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"unsupported transaction %d", size));
-		return (-1);
-	}
-
-	return (0);
+	int scale = 1;
+	while (log--)
+		scale *= 10;
+	return scale;
 }
 
-static int
-acpi_sbs_read_word(struct acpi_sbs *sbs, int addr, int func, u16 * word)
+static inline int acpi_battery_vscale(struct acpi_battery *battery)
 {
-	union sbs_rw_data data;
-	int result = 0;
-
-	result = acpi_ec_sbs_access(sbs, addr,
-				    ACPI_SBS_SMBUS_READ, func,
-				    ACPI_SBS_WORD_DATA, &data);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_ec_sbs_access() failed"));
-	} else {
-		*word = data.word;
-	}
-
-	return result;
+	return battery_scale((battery->spec & 0x0f00) >> 8);
 }
 
-static int
-acpi_sbs_read_str(struct acpi_sbs *sbs, int addr, int func, char *str)
+static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 {
-	union sbs_rw_data data;
-	int result = 0;
-
-	result = acpi_ec_sbs_access(sbs, addr,
-				    ACPI_SBS_SMBUS_READ, func,
-				    ACPI_SBS_BLOCK_DATA, &data);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_ec_sbs_access() failed"));
-	} else {
-		strncpy(str, (const char *)data.block + 1, data.block[0]);
-		str[data.block[0]] = 0;
-	}
-
-	return result;
+	return battery_scale((battery->spec & 0xf000) >> 12);
 }
 
-static int
-acpi_sbs_write_word(struct acpi_sbs *sbs, int addr, int func, int word)
+static inline int acpi_battery_mode(struct acpi_battery *battery)
 {
-	union sbs_rw_data data;
-	int result = 0;
-
-	data.word = word;
-
-	result = acpi_ec_sbs_access(sbs, addr,
-				    ACPI_SBS_SMBUS_WRITE, func,
-				    ACPI_SBS_WORD_DATA, &data);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_ec_sbs_access() failed"));
-	}
-
-	return result;
+	return (battery->mode & 0x8000);
 }
 
-static int sbs_zombie(struct acpi_sbs *sbs)
+static inline int acpi_battery_scale(struct acpi_battery *battery)
 {
-	return (sbs->zombie);
+	return (acpi_battery_mode(battery) ? 10 : 1) *
+	    acpi_battery_ipscale(battery);
 }
 
-static int sbs_mutex_lock(struct acpi_sbs *sbs)
+static int sbs_get_ac_property(struct power_supply *psy,
+			       enum power_supply_property psp,
+			       union power_supply_propval *val)
 {
-	if (sbs_zombie(sbs)) {
-		return -ENODEV;
+	struct acpi_sbs *sbs = to_acpi_sbs(psy);
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = sbs->charger_present;
+		break;
+	default:
+		return -EINVAL;
 	}
-	mutex_lock(&sbs->mutex);
 	return 0;
 }
 
-static void sbs_mutex_unlock(struct acpi_sbs *sbs)
+static int acpi_battery_technology(struct acpi_battery *battery)
 {
-	mutex_unlock(&sbs->mutex);
+	if (!strcasecmp("NiCd", battery->device_chemistry))
+		return POWER_SUPPLY_TECHNOLOGY_NiCd;
+	if (!strcasecmp("NiMH", battery->device_chemistry))
+		return POWER_SUPPLY_TECHNOLOGY_NiMH;
+	if (!strcasecmp("LION", battery->device_chemistry))
+		return POWER_SUPPLY_TECHNOLOGY_LION;
+	if (!strcasecmp("LiP", battery->device_chemistry))
+		return POWER_SUPPLY_TECHNOLOGY_LIPO;
+	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 }
 
-/* --------------------------------------------------------------------------
-                            Smart Battery System Management
-   -------------------------------------------------------------------------- */
-
-static int acpi_check_update_proc(struct acpi_sbs *sbs)
+static int acpi_sbs_battery_get_property(struct power_supply *psy,
+					 enum power_supply_property psp,
+					 union power_supply_propval *val)
 {
-	acpi_status status = AE_OK;
+	struct acpi_battery *battery = to_acpi_battery(psy);
 
-	if (update_time == 0) {
-		sbs->update_proc_flg = 0;
-		return 0;
-	}
-	if (sbs->update_proc_flg == 0) {
-		status = acpi_os_execute(OSL_GPE_HANDLER,
-					 acpi_sbs_update_time, sbs);
-		if (status != AE_OK) {
-			ACPI_EXCEPTION((AE_INFO, status,
-					"acpi_os_execute() failed"));
-			return 1;
-		}
-		sbs->update_proc_flg = 1;
+	if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
+		return -ENODEV;
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (battery->current_now < 0)
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		else if (battery->current_now > 0)
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		else
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = battery->present;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = acpi_battery_technology(battery);
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = battery->design_voltage *
+			acpi_battery_vscale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = battery->voltage_now *
+				acpi_battery_vscale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		val->intval = abs(battery->current_now) *
+				acpi_battery_ipscale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		val->intval = abs(battery->current_avg) *
+				acpi_battery_ipscale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		val->intval = battery->state_of_charge;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+		val->intval = battery->design_capacity *
+			acpi_battery_scale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL:
+	case POWER_SUPPLY_PROP_ENERGY_FULL:
+		val->intval = battery->full_charge_capacity *
+			acpi_battery_scale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+	case POWER_SUPPLY_PROP_ENERGY_NOW:
+		val->intval = battery->capacity_now *
+				acpi_battery_scale(battery) * 1000;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		val->intval = battery->temp_now - 2730;	// dK -> dC
+		break;
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval = battery->device_name;
+		break;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		val->strval = battery->manufacturer_name;
+		break;
+	default:
+		return -EINVAL;
 	}
 	return 0;
 }
 
-static int acpi_sbs_generate_event(struct acpi_device *device,
-				   int event, int state, char *bid, char *class)
-{
-	char bid_saved[5];
-	char class_saved[20];
-	int result = 0;
-
-	strcpy(bid_saved, acpi_device_bid(device));
-	strcpy(class_saved, acpi_device_class(device));
-
-	strcpy(acpi_device_bid(device), bid);
-	strcpy(acpi_device_class(device), class);
-
-	result = acpi_bus_generate_proc_event(device, event, state);
-
-	strcpy(acpi_device_bid(device), bid_saved);
-	strcpy(acpi_device_class(device), class_saved);
-
-	acpi_bus_generate_netlink_event(class, bid, event, state);
-	return result;
-}
-
-static int acpi_battery_get_present(struct acpi_battery *battery)
-{
-	s16 state;
-	int result = 0;
-	int is_present = 0;
-
-	result = acpi_sbs_read_word(battery->sbs,
-				    ACPI_SBSM_SMBUS_ADDR, 0x01, &state);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-	}
-	if (!result) {
-		is_present = (state & 0x000f) & (1 << battery->id);
-	}
-	battery->battery_present = is_present;
-
-	return result;
-}
+static enum power_supply_property sbs_ac_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
 
-static int acpi_battery_select(struct acpi_battery *battery)
-{
-	struct acpi_sbs *sbs = battery->sbs;
-	int result = 0;
-	s16 state;
-	int foo;
+static enum power_supply_property sbs_charge_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
 
-	if (sbs->sbsm_present) {
+static enum power_supply_property sbs_energy_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+	POWER_SUPPLY_PROP_ENERGY_FULL,
+	POWER_SUPPLY_PROP_ENERGY_NOW,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
 
-		/* Take special care not to knobble other nibbles of
-		 * state (aka selector_state), since
-		 * it causes charging to halt on SBSELs */
+/* --------------------------------------------------------------------------
+                            Smart Battery System Management
+   -------------------------------------------------------------------------- */
 
-		result =
-		    acpi_sbs_read_word(sbs, ACPI_SBSM_SMBUS_ADDR, 0x01, &state);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_read_word() failed"));
-			goto end;
-		}
+struct acpi_battery_reader {
+	u8 command;		/* command for battery */
+	u8 mode;		/* word or block? */
+	size_t offset;		/* offset inside struct acpi_sbs_battery */
+};
 
-		foo = (state & 0x0fff) | (1 << (battery->id + 12));
-		result =
-		    acpi_sbs_write_word(sbs, ACPI_SBSM_SMBUS_ADDR, 0x01, foo);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_write_word() failed"));
-			goto end;
-		}
-	}
+static struct acpi_battery_reader info_readers[] = {
+	{0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
+	{0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
+	{0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
+	{0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
+	{0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
+	{0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
+	{0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
+	{0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
+	{0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
+	{0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
+	{0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
+};
 
-      end:
-	return result;
-}
+static struct acpi_battery_reader state_readers[] = {
+	{0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
+	{0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
+	{0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
+	{0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
+	{0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
+	{0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
+	{0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
+};
 
-static int acpi_sbsm_get_info(struct acpi_sbs *sbs)
+static int acpi_manager_get_info(struct acpi_sbs *sbs)
 {
 	int result = 0;
-	s16 battery_system_info;
-
-	result = acpi_sbs_read_word(sbs, ACPI_SBSM_SMBUS_ADDR, 0x04,
-				    &battery_system_info);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-	sbs->sbsm_present = 1;
-	sbs->sbsm_batteries_supported = battery_system_info & 0x000f;
-
-      end:
+	u16 battery_system_info;
 
+	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
+				 0x04, (u8 *)&battery_system_info);
+	if (!result)
+		sbs->batteries_supported = battery_system_info & 0x000f;
 	return result;
 }
 
 static int acpi_battery_get_info(struct acpi_battery *battery)
 {
-	struct acpi_sbs *sbs = battery->sbs;
-	int result = 0;
-	s16 battery_mode;
-	s16 specification_info;
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x03,
-				    &battery_mode);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-	battery->info.capacity_mode = (battery_mode & 0x8000) >> 15;
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x10,
-				    &battery->info.full_charge_capacity);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x18,
-				    &battery->info.design_capacity);
-
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x19,
-				    &battery->info.design_voltage);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
+	int i, result = 0;
+
+	for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
+		result = acpi_smbus_read(battery->sbs->hc,
+					 info_readers[i].mode,
+					 ACPI_SBS_BATTERY,
+					 info_readers[i].command,
+					 (u8 *) battery +
+						info_readers[i].offset);
+		if (result)
+			break;
 	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x1a,
-				    &specification_info);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	switch ((specification_info & 0x0f00) >> 8) {
-	case 1:
-		battery->info.vscale = 10;
-		break;
-	case 2:
-		battery->info.vscale = 100;
-		break;
-	case 3:
-		battery->info.vscale = 1000;
-		break;
-	default:
-		battery->info.vscale = 1;
-	}
-
-	switch ((specification_info & 0xf000) >> 12) {
-	case 1:
-		battery->info.ipscale = 10;
-		break;
-	case 2:
-		battery->info.ipscale = 100;
-		break;
-	case 3:
-		battery->info.ipscale = 1000;
-		break;
-	default:
-		battery->info.ipscale = 1;
-	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x1c,
-				    &battery->info.serial_number);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_str(sbs, ACPI_SB_SMBUS_ADDR, 0x20,
-				   battery->info.manufacturer_name);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_str() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_str(sbs, ACPI_SB_SMBUS_ADDR, 0x21,
-				   battery->info.device_name);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_str() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_str(sbs, ACPI_SB_SMBUS_ADDR, 0x22,
-				   battery->info.device_chemistry);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_str() failed"));
-		goto end;
-	}
-
-      end:
 	return result;
 }
 
 static int acpi_battery_get_state(struct acpi_battery *battery)
 {
-	struct acpi_sbs *sbs = battery->sbs;
-	int result = 0;
+	int i, result = 0;
 
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x09,
-				    &battery->state.voltage);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x0a,
-				    &battery->state.amperage);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x0f,
-				    &battery->state.remaining_capacity);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x16,
-				    &battery->state.battery_state);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
+	if (battery->update_time &&
+	    time_before(jiffies, battery->update_time +
+				msecs_to_jiffies(cache_time)))
+		return 0;
+	for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
+		result = acpi_smbus_read(battery->sbs->hc,
+					 state_readers[i].mode,
+					 ACPI_SBS_BATTERY,
+					 state_readers[i].command,
+				         (u8 *)battery +
+						state_readers[i].offset);
+		if (result)
+			goto end;
 	}
-
       end:
+	battery->update_time = jiffies;
 	return result;
 }
 
 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 {
-	struct acpi_sbs *sbs = battery->sbs;
-	int result = 0;
-
-	result = acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x01,
-				    &battery->alarm.remaining_capacity);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-      end:
-
-	return result;
+	return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
+				 ACPI_SBS_BATTERY, 0x01,
+				 (u8 *)&battery->alarm_capacity);
 }
 
-static int acpi_battery_set_alarm(struct acpi_battery *battery,
-				  unsigned long alarm)
+static int acpi_battery_set_alarm(struct acpi_battery *battery)
 {
 	struct acpi_sbs *sbs = battery->sbs;
-	int result = 0;
-	s16 battery_mode;
-	int foo;
+	u16 value, sel = 1 << (battery->id + 12);
 
-	result = acpi_battery_select(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_select() failed"));
-		goto end;
-	}
+	int ret;
 
-	/* If necessary, enable the alarm */
 
-	if (alarm > 0) {
-		result =
-		    acpi_sbs_read_word(sbs, ACPI_SB_SMBUS_ADDR, 0x03,
-				       &battery_mode);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_read_word() failed"));
+	if (sbs->manager_present) {
+		ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
+				0x01, (u8 *)&value);
+		if (ret)
 			goto end;
-		}
-
-		result =
-		    acpi_sbs_write_word(sbs, ACPI_SB_SMBUS_ADDR, 0x01,
-					battery_mode & 0xbfff);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_write_word() failed"));
+		if ((value & 0xf000) != sel) {
+			value &= 0x0fff;
+			value |= sel;
+		ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
+					 ACPI_SBS_MANAGER,
+					 0x01, (u8 *)&value, 2);
+		if (ret)
 			goto end;
 		}
 	}
-
-	foo = alarm / (battery->info.capacity_mode ? 10 : 1);
-	result = acpi_sbs_write_word(sbs, ACPI_SB_SMBUS_ADDR, 0x01, foo);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_write_word() failed"));
-		goto end;
-	}
-
+	ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
+				0x01, (u8 *)&battery->alarm_capacity, 2);
       end:
-
-	return result;
+	return ret;
 }
 
-static int acpi_battery_set_mode(struct acpi_battery *battery)
+static int acpi_ac_get_present(struct acpi_sbs *sbs)
 {
-	struct acpi_sbs *sbs = battery->sbs;
-	int result = 0;
-	s16 battery_mode;
-
-	if (capacity_mode == DEF_CAPACITY_UNIT) {
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs,
-				    ACPI_SB_SMBUS_ADDR, 0x03, &battery_mode);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	if (capacity_mode == MAH_CAPACITY_UNIT) {
-		battery_mode &= 0x7fff;
-	} else {
-		battery_mode |= 0x8000;
-	}
-	result = acpi_sbs_write_word(sbs,
-				     ACPI_SB_SMBUS_ADDR, 0x03, battery_mode);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_write_word() failed"));
-		goto end;
-	}
-
-	result = acpi_sbs_read_word(sbs,
-				    ACPI_SB_SMBUS_ADDR, 0x03, &battery_mode);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
+	int result;
+	u16 status;
 
-      end:
+	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
+				 0x13, (u8 *) & status);
+	if (!result)
+		sbs->charger_present = (status >> 15) & 0x1;
 	return result;
 }
 
-static int acpi_battery_init(struct acpi_battery *battery)
+static ssize_t acpi_battery_alarm_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
 {
-	int result = 0;
-
-	result = acpi_battery_select(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_select() failed"));
-		goto end;
-	}
-
-	result = acpi_battery_set_mode(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_set_mode() failed"));
-		goto end;
-	}
-
-	result = acpi_battery_get_info(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_get_info() failed"));
-		goto end;
-	}
-
-	result = acpi_battery_get_state(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_get_state() failed"));
-		goto end;
-	}
-
-	result = acpi_battery_get_alarm(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_get_alarm() failed"));
-		goto end;
-	}
-
-      end:
-	return result;
+	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+	acpi_battery_get_alarm(battery);
+	return sprintf(buf, "%d\n", battery->alarm_capacity *
+				acpi_battery_scale(battery) * 1000);
 }
 
-static int acpi_ac_get_present(struct acpi_sbs *sbs)
+static ssize_t acpi_battery_alarm_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
 {
-	int result = 0;
-	s16 charger_status;
-
-	result = acpi_sbs_read_word(sbs, ACPI_SBC_SMBUS_ADDR, 0x13,
-				    &charger_status);
-
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_read_word() failed"));
-		goto end;
-	}
-
-	sbs->ac.ac_present = (charger_status & 0x8000) >> 15;
-
-      end:
-
-	return result;
+	unsigned long x;
+	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+	if (sscanf(buf, "%ld\n", &x) == 1)
+		battery->alarm_capacity = x /
+			(1000 * acpi_battery_scale(battery));
+	if (battery->present)
+		acpi_battery_set_alarm(battery);
+	return count;
 }
 
+static struct device_attribute alarm_attr = {
+	.attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
+	.show = acpi_battery_alarm_show,
+	.store = acpi_battery_alarm_store,
+};
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc/acpi)
    -------------------------------------------------------------------------- */
 
+#ifdef CONFIG_ACPI_PROCFS
 /* Generic Routines */
-
 static int
-acpi_sbs_generic_add_fs(struct proc_dir_entry **dir,
-			struct proc_dir_entry *parent_dir,
-			char *dir_name,
-			struct file_operations *info_fops,
-			struct file_operations *state_fops,
-			struct file_operations *alarm_fops, void *data)
+acpi_sbs_add_fs(struct proc_dir_entry **dir,
+		struct proc_dir_entry *parent_dir,
+		char *dir_name,
+		struct file_operations *info_fops,
+		struct file_operations *state_fops,
+		struct file_operations *alarm_fops, void *data)
 {
 	struct proc_dir_entry *entry = NULL;
 
 	if (!*dir) {
 		*dir = proc_mkdir(dir_name, parent_dir);
 		if (!*dir) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"proc_mkdir() failed"));
 			return -ENODEV;
 		}
 		(*dir)->owner = THIS_MODULE;
@@ -882,10 +491,7 @@ acpi_sbs_generic_add_fs(struct proc_dir_entry **dir,
 	/* 'info' [R] */
 	if (info_fops) {
 		entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
-		if (!entry) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"create_proc_entry() failed"));
-		} else {
+		if (entry) {
 			entry->proc_fops = info_fops;
 			entry->data = data;
 			entry->owner = THIS_MODULE;
@@ -895,10 +501,7 @@ acpi_sbs_generic_add_fs(struct proc_dir_entry **dir,
 	/* 'state' [R] */
 	if (state_fops) {
 		entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
-		if (!entry) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"create_proc_entry() failed"));
-		} else {
+		if (entry) {
 			entry->proc_fops = state_fops;
 			entry->data = data;
 			entry->owner = THIS_MODULE;
@@ -908,24 +511,19 @@ acpi_sbs_generic_add_fs(struct proc_dir_entry **dir,
 	/* 'alarm' [R/W] */
 	if (alarm_fops) {
 		entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
-		if (!entry) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"create_proc_entry() failed"));
-		} else {
+		if (entry) {
 			entry->proc_fops = alarm_fops;
 			entry->data = data;
 			entry->owner = THIS_MODULE;
 		}
 	}
-
 	return 0;
 }
 
 static void
-acpi_sbs_generic_remove_fs(struct proc_dir_entry **dir,
+acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 			   struct proc_dir_entry *parent_dir)
 {
-
 	if (*dir) {
 		remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 		remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
@@ -933,82 +531,52 @@ acpi_sbs_generic_remove_fs(struct proc_dir_entry **dir,
 		remove_proc_entry((*dir)->name, parent_dir);
 		*dir = NULL;
 	}
-
 }
 
 /* Smart Battery Interface */
-
 static struct proc_dir_entry *acpi_battery_dir = NULL;
 
+static inline char *acpi_battery_units(struct acpi_battery *battery)
+{
+	return acpi_battery_mode(battery) ? " mWh" : " mAh";
+}
+
+
 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 {
 	struct acpi_battery *battery = seq->private;
 	struct acpi_sbs *sbs = battery->sbs;
-	int cscale;
 	int result = 0;
 
-	if (sbs_mutex_lock(sbs)) {
-		return -ENODEV;
-	}
-
-	result = acpi_check_update_proc(sbs);
-	if (result)
-		goto end;
-
-	if (update_time == 0) {
-		result = acpi_sbs_update_run(sbs, battery->id, DATA_TYPE_INFO);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_update_run() failed"));
-		}
-	}
+	mutex_lock(&sbs->lock);
 
-	if (battery->battery_present) {
-		seq_printf(seq, "present:                 yes\n");
-	} else {
-		seq_printf(seq, "present:                 no\n");
+	seq_printf(seq, "present:                 %s\n",
+		   (battery->present) ? "yes" : "no");
+	if (!battery->present)
 		goto end;
-	}
 
-	if (battery->info.capacity_mode) {
-		cscale = battery->info.vscale * battery->info.ipscale;
-	} else {
-		cscale = battery->info.ipscale;
-	}
 	seq_printf(seq, "design capacity:         %i%s\n",
-		   battery->info.design_capacity * cscale,
-		   battery->info.capacity_mode ? "0 mWh" : " mAh");
-
+		   battery->design_capacity * acpi_battery_scale(battery),
+		   acpi_battery_units(battery));
 	seq_printf(seq, "last full capacity:      %i%s\n",
-		   battery->info.full_charge_capacity * cscale,
-		   battery->info.capacity_mode ? "0 mWh" : " mAh");
-
+		   battery->full_charge_capacity * acpi_battery_scale(battery),
+		   acpi_battery_units(battery));
 	seq_printf(seq, "battery technology:      rechargeable\n");
-
 	seq_printf(seq, "design voltage:          %i mV\n",
-		   battery->info.design_voltage * battery->info.vscale);
-
+		   battery->design_voltage * acpi_battery_vscale(battery));
 	seq_printf(seq, "design capacity warning: unknown\n");
 	seq_printf(seq, "design capacity low:     unknown\n");
 	seq_printf(seq, "capacity granularity 1:  unknown\n");
 	seq_printf(seq, "capacity granularity 2:  unknown\n");
-
-	seq_printf(seq, "model number:            %s\n",
-		   battery->info.device_name);
-
+	seq_printf(seq, "model number:            %s\n", battery->device_name);
 	seq_printf(seq, "serial number:           %i\n",
-		   battery->info.serial_number);
-
+		   battery->serial_number);
 	seq_printf(seq, "battery type:            %s\n",
-		   battery->info.device_chemistry);
-
+		   battery->device_chemistry);
 	seq_printf(seq, "OEM info:                %s\n",
-		   battery->info.manufacturer_name);
-
+		   battery->manufacturer_name);
       end:
-
-	sbs_mutex_unlock(sbs);
-
+	mutex_unlock(&sbs->lock);
 	return result;
 }
 
@@ -1022,73 +590,29 @@ static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 	struct acpi_battery *battery = seq->private;
 	struct acpi_sbs *sbs = battery->sbs;
 	int result = 0;
-	int cscale;
-	int foo;
-
-	if (sbs_mutex_lock(sbs)) {
-		return -ENODEV;
-	}
 
-	result = acpi_check_update_proc(sbs);
-	if (result)
+	mutex_lock(&sbs->lock);
+	seq_printf(seq, "present:                 %s\n",
+		   (battery->present) ? "yes" : "no");
+	if (!battery->present)
 		goto end;
 
-	if (update_time == 0) {
-		result = acpi_sbs_update_run(sbs, battery->id, DATA_TYPE_STATE);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_update_run() failed"));
-		}
-	}
-
-	if (battery->battery_present) {
-		seq_printf(seq, "present:                 yes\n");
-	} else {
-		seq_printf(seq, "present:                 no\n");
-		goto end;
-	}
-
-	if (battery->info.capacity_mode) {
-		cscale = battery->info.vscale * battery->info.ipscale;
-	} else {
-		cscale = battery->info.ipscale;
-	}
-
-	if (battery->state.battery_state & 0x0010) {
-		seq_printf(seq, "capacity state:          critical\n");
-	} else {
-		seq_printf(seq, "capacity state:          ok\n");
-	}
-
-	foo = (s16) battery->state.amperage * battery->info.ipscale;
-	if (battery->info.capacity_mode) {
-		foo = foo * battery->info.design_voltage / 1000;
-	}
-	if (battery->state.amperage < 0) {
-		seq_printf(seq, "charging state:          discharging\n");
-		seq_printf(seq, "present rate:            %d %s\n",
-			   -foo, battery->info.capacity_mode ? "mW" : "mA");
-	} else if (battery->state.amperage > 0) {
-		seq_printf(seq, "charging state:          charging\n");
-		seq_printf(seq, "present rate:            %d %s\n",
-			   foo, battery->info.capacity_mode ? "mW" : "mA");
-	} else {
-		seq_printf(seq, "charging state:          charged\n");
-		seq_printf(seq, "present rate:            0 %s\n",
-			   battery->info.capacity_mode ? "mW" : "mA");
-	}
-
+	acpi_battery_get_state(battery);
+	seq_printf(seq, "capacity state:          %s\n",
+		   (battery->state & 0x0010) ? "critical" : "ok");
+	seq_printf(seq, "charging state:          %s\n",
+		   (battery->current_now < 0) ? "discharging" :
+		   ((battery->current_now > 0) ? "charging" : "charged"));
+	seq_printf(seq, "present rate:            %d mA\n",
+		   abs(battery->current_now) * acpi_battery_ipscale(battery));
 	seq_printf(seq, "remaining capacity:      %i%s\n",
-		   battery->state.remaining_capacity * cscale,
-		   battery->info.capacity_mode ? "0 mWh" : " mAh");
-
+		   battery->capacity_now * acpi_battery_scale(battery),
+		   acpi_battery_units(battery));
 	seq_printf(seq, "present voltage:         %i mV\n",
-		   battery->state.voltage * battery->info.vscale);
+		   battery->voltage_now * acpi_battery_vscale(battery));
 
       end:
-
-	sbs_mutex_unlock(sbs);
-
+	mutex_unlock(&sbs->lock);
 	return result;
 }
 
@@ -1102,48 +626,25 @@ static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 	struct acpi_battery *battery = seq->private;
 	struct acpi_sbs *sbs = battery->sbs;
 	int result = 0;
-	int cscale;
-
-	if (sbs_mutex_lock(sbs)) {
-		return -ENODEV;
-	}
-
-	result = acpi_check_update_proc(sbs);
-	if (result)
-		goto end;
 
-	if (update_time == 0) {
-		result = acpi_sbs_update_run(sbs, battery->id, DATA_TYPE_ALARM);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_update_run() failed"));
-		}
-	}
+	mutex_lock(&sbs->lock);
 
-	if (!battery->battery_present) {
+	if (!battery->present) {
 		seq_printf(seq, "present:                 no\n");
 		goto end;
 	}
 
-	if (battery->info.capacity_mode) {
-		cscale = battery->info.vscale * battery->info.ipscale;
-	} else {
-		cscale = battery->info.ipscale;
-	}
-
+	acpi_battery_get_alarm(battery);
 	seq_printf(seq, "alarm:                   ");
-	if (battery->alarm.remaining_capacity) {
+	if (battery->alarm_capacity)
 		seq_printf(seq, "%i%s\n",
-			   battery->alarm.remaining_capacity * cscale,
-			   battery->info.capacity_mode ? "0 mWh" : " mAh");
-	} else {
+			   battery->alarm_capacity *
+			   acpi_battery_scale(battery),
+			   acpi_battery_units(battery));
+	else
 		seq_printf(seq, "disabled\n");
-	}
-
       end:
-
-	sbs_mutex_unlock(sbs);
-
+	mutex_unlock(&sbs->lock);
 	return result;
 }
 
@@ -1155,59 +656,29 @@ acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 	struct acpi_battery *battery = seq->private;
 	struct acpi_sbs *sbs = battery->sbs;
 	char alarm_string[12] = { '\0' };
-	int result, old_alarm, new_alarm;
-
-	if (sbs_mutex_lock(sbs)) {
-		return -ENODEV;
-	}
-
-	result = acpi_check_update_proc(sbs);
-	if (result)
-		goto end;
-
-	if (!battery->battery_present) {
+	int result = 0;
+	mutex_lock(&sbs->lock);
+	if (!battery->present) {
 		result = -ENODEV;
 		goto end;
 	}
-
 	if (count > sizeof(alarm_string) - 1) {
 		result = -EINVAL;
 		goto end;
 	}
-
 	if (copy_from_user(alarm_string, buffer, count)) {
 		result = -EFAULT;
 		goto end;
 	}
-
 	alarm_string[count] = 0;
-
-	old_alarm = battery->alarm.remaining_capacity;
-	new_alarm = simple_strtoul(alarm_string, NULL, 0);
-
-	result = acpi_battery_set_alarm(battery, new_alarm);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_set_alarm() failed"));
-		acpi_battery_set_alarm(battery, old_alarm);
-		goto end;
-	}
-	result = acpi_battery_get_alarm(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_get_alarm() failed"));
-		acpi_battery_set_alarm(battery, old_alarm);
-		goto end;
-	}
-
+	battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
+					acpi_battery_scale(battery);
+	acpi_battery_set_alarm(battery);
       end:
-	sbs_mutex_unlock(sbs);
-
-	if (result) {
+	mutex_unlock(&sbs->lock);
+	if (result)
 		return result;
-	} else {
-		return count;
-	}
+	return count;
 }
 
 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
@@ -1246,26 +717,15 @@ static struct proc_dir_entry *acpi_ac_dir = NULL;
 
 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 {
-	struct acpi_sbs *sbs = seq->private;
-	int result;
 
-	if (sbs_mutex_lock(sbs)) {
-		return -ENODEV;
-	}
+	struct acpi_sbs *sbs = seq->private;
 
-	if (update_time == 0) {
-		result = acpi_sbs_update_run(sbs, -1, DATA_TYPE_AC_STATE);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_update_run() failed"));
-		}
-	}
+	mutex_lock(&sbs->lock);
 
 	seq_printf(seq, "state:                   %s\n",
-		   sbs->ac.ac_present ? "on-line" : "off-line");
-
-	sbs_mutex_unlock(sbs);
+		   sbs->charger_present ? "on-line" : "off-line");
 
+	mutex_unlock(&sbs->lock);
 	return 0;
 }
 
@@ -1282,429 +742,203 @@ static struct file_operations acpi_ac_state_fops = {
 	.owner = THIS_MODULE,
 };
 
+#endif
+
 /* --------------------------------------------------------------------------
                                  Driver Interface
    -------------------------------------------------------------------------- */
+static int acpi_battery_read(struct acpi_battery *battery)
+{
+	int result = 0, saved_present = battery->present;
+	u16 state;
+
+	if (battery->sbs->manager_present) {
+		result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
+				ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
+		if (!result)
+			battery->present = state & (1 << battery->id);
+		state &= 0x0fff;
+		state |= 1 << (battery->id + 12);
+		acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
+				  ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
+	} else if (battery->id == 0)
+		battery->present = 1;
+	if (result || !battery->present)
+		return result;
 
-/* Smart Battery */
+	if (saved_present != battery->present) {
+		battery->update_time = 0;
+		result = acpi_battery_get_info(battery);
+		if (result)
+			return result;
+	}
+	result = acpi_battery_get_state(battery);
+	return result;
+}
 
+/* Smart Battery */
 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 {
-	int is_present;
+	struct acpi_battery *battery = &sbs->battery[id];
 	int result;
-	char dir_name[32];
-	struct acpi_battery *battery;
-
-	battery = &sbs->battery[id];
-
-	battery->alive = 0;
 
-	battery->init_state = 0;
 	battery->id = id;
 	battery->sbs = sbs;
+	result = acpi_battery_read(battery);
+	if (result)
+		return result;
 
-	result = acpi_battery_select(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_select() failed"));
-		goto end;
-	}
-
-	result = acpi_battery_get_present(battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_battery_get_present() failed"));
-		goto end;
-	}
-
-	is_present = battery->battery_present;
-
-	if (is_present) {
-		result = acpi_battery_init(battery);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_battery_init() failed"));
-			goto end;
-		}
-		battery->init_state = 1;
-	}
-
-	sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
-
-	result = acpi_sbs_generic_add_fs(&battery->battery_entry,
-					 acpi_battery_dir,
-					 dir_name,
-					 &acpi_battery_info_fops,
-					 &acpi_battery_state_fops,
-					 &acpi_battery_alarm_fops, battery);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_generic_add_fs() failed"));
-		goto end;
+	sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
+#ifdef CONFIG_ACPI_PROCFS
+	acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
+			battery->name, &acpi_battery_info_fops,
+			&acpi_battery_state_fops, &acpi_battery_alarm_fops,
+			battery);
+#endif
+	battery->bat.name = battery->name;
+	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+	if (!acpi_battery_mode(battery)) {
+		battery->bat.properties = sbs_charge_battery_props;
+		battery->bat.num_properties =
+		    ARRAY_SIZE(sbs_charge_battery_props);
+	} else {
+		battery->bat.properties = sbs_energy_battery_props;
+		battery->bat.num_properties =
+		    ARRAY_SIZE(sbs_energy_battery_props);
 	}
-	battery->alive = 1;
-
+	battery->bat.get_property = acpi_sbs_battery_get_property;
+	result = power_supply_register(&sbs->device->dev, &battery->bat);
+	device_create_file(battery->bat.dev, &alarm_attr);
 	printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
-	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), dir_name,
-	       sbs->battery->battery_present ? "present" : "absent");
-
-      end:
+	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
+	       battery->name, sbs->battery->present ? "present" : "absent");
 	return result;
 }
 
 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 {
-
-	if (sbs->battery[id].battery_entry) {
-		acpi_sbs_generic_remove_fs(&(sbs->battery[id].battery_entry),
-					   acpi_battery_dir);
-	}
+	if (sbs->battery[id].bat.dev)
+		device_remove_file(sbs->battery[id].bat.dev, &alarm_attr);
+		power_supply_unregister(&sbs->battery[id].bat);
+#ifdef CONFIG_ACPI_PROCFS
+	if (sbs->battery[id].proc_entry) {
+		acpi_sbs_remove_fs(&(sbs->battery[id].proc_entry),
+				   acpi_battery_dir);
+	}
+#endif
 }
 
-static int acpi_ac_add(struct acpi_sbs *sbs)
+static int acpi_charger_add(struct acpi_sbs *sbs)
 {
 	int result;
 
 	result = acpi_ac_get_present(sbs);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_ac_get_present() failed"));
+	if (result)
 		goto end;
-	}
-
-	result = acpi_sbs_generic_add_fs(&sbs->ac_entry,
-					 acpi_ac_dir,
-					 ACPI_AC_DIR_NAME,
-					 NULL, &acpi_ac_state_fops, NULL, sbs);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_generic_add_fs() failed"));
+#ifdef CONFIG_ACPI_PROCFS
+	result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
+				 ACPI_AC_DIR_NAME, NULL,
+				 &acpi_ac_state_fops, NULL, sbs);
+	if (result)
 		goto end;
-	}
-
+#endif
+	sbs->charger.name = "sbs-charger";
+	sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
+	sbs->charger.properties = sbs_ac_props;
+	sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
+	sbs->charger.get_property = sbs_get_ac_property;
+	power_supply_register(&sbs->device->dev, &sbs->charger);
 	printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
-	       ACPI_AC_DIR_NAME, sbs->ac.ac_present ? "on-line" : "off-line");
-
+	       ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
       end:
-
 	return result;
 }
 
-static void acpi_ac_remove(struct acpi_sbs *sbs)
+static void acpi_charger_remove(struct acpi_sbs *sbs)
 {
-
-	if (sbs->ac_entry) {
-		acpi_sbs_generic_remove_fs(&sbs->ac_entry, acpi_ac_dir);
-	}
+	if (sbs->charger.dev)
+		power_supply_unregister(&sbs->charger);
+#ifdef CONFIG_ACPI_PROCFS
+	if (sbs->charger_entry)
+		acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
+#endif
 }
 
-static void acpi_sbs_update_time_run(unsigned long data)
+void acpi_sbs_callback(void *context)
 {
-	acpi_os_execute(OSL_GPE_HANDLER, acpi_sbs_update_time, (void *)data);
-}
-
-static int acpi_sbs_update_run(struct acpi_sbs *sbs, int id, int data_type)
-{
-	struct acpi_battery *battery;
-	int result = 0, cnt;
-	int old_ac_present = -1;
-	int old_battery_present = -1;
-	int new_ac_present = -1;
-	int new_battery_present = -1;
-	int id_min = 0, id_max = MAX_SBS_BAT - 1;
-	char dir_name[32];
-	int do_battery_init = 0, do_ac_init = 0;
-	int old_remaining_capacity = 0;
-	int update_battery = 1;
-	int up_tm = update_time;
-
-	if (sbs_zombie(sbs)) {
-		goto end;
-	}
-
-	if (id >= 0) {
-		id_min = id_max = id;
-	}
-
-	if (data_type == DATA_TYPE_COMMON && up_tm > 0) {
-		cnt = up_tm / (up_tm > UPDATE_DELAY ? UPDATE_DELAY : up_tm);
-		if (sbs->run_cnt % cnt != 0) {
-			update_battery = 0;
-		}
-	}
-
-	sbs->run_cnt++;
-
-	old_ac_present = sbs->ac.ac_present;
-
-	result = acpi_ac_get_present(sbs);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_ac_get_present() failed"));
-	}
-
-	new_ac_present = sbs->ac.ac_present;
-
-	do_ac_init = (old_ac_present != new_ac_present);
-	if (sbs->run_cnt == 1 && data_type == DATA_TYPE_COMMON) {
-		do_ac_init = 1;
-	}
-
-	if (do_ac_init) {
-		result = acpi_sbs_generate_event(sbs->device,
-						 ACPI_SBS_AC_NOTIFY_STATUS,
-						 new_ac_present,
-						 ACPI_AC_DIR_NAME,
-						 ACPI_AC_CLASS);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_generate_event() failed"));
-		}
-	}
-
-	if (data_type == DATA_TYPE_COMMON) {
-		if (!do_ac_init && !update_battery) {
-			goto end;
-		}
-	}
-
-	if (data_type == DATA_TYPE_AC_STATE && !do_ac_init) {
-		goto end;
-	}
-
-	for (id = id_min; id <= id_max; id++) {
-		battery = &sbs->battery[id];
-		if (battery->alive == 0) {
-			continue;
-		}
-
-		old_remaining_capacity = battery->state.remaining_capacity;
-
-		old_battery_present = battery->battery_present;
-
-		result = acpi_battery_select(battery);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_battery_select() failed"));
-		}
-
-		result = acpi_battery_get_present(battery);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_battery_get_present() failed"));
-		}
-
-		new_battery_present = battery->battery_present;
-
-		do_battery_init = ((old_battery_present != new_battery_present)
-				   && new_battery_present);
-		if (!new_battery_present)
-			goto event;
-		if (do_ac_init || do_battery_init) {
-			result = acpi_battery_init(battery);
-			if (result) {
-				ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-						"acpi_battery_init() "
-						"failed"));
-			}
-		}
-		if (sbs_zombie(sbs)) {
-			goto end;
-		}
-
-		if ((data_type == DATA_TYPE_COMMON
-		     || data_type == DATA_TYPE_INFO)
-		    && new_battery_present) {
-			result = acpi_battery_get_info(battery);
-			if (result) {
-				ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-						"acpi_battery_get_info() failed"));
-			}
-		}
-		if (data_type == DATA_TYPE_INFO) {
-			continue;
-		}
-		if (sbs_zombie(sbs)) {
-			goto end;
-		}
-
-		if ((data_type == DATA_TYPE_COMMON
-		     || data_type == DATA_TYPE_STATE)
-		    && new_battery_present) {
-			result = acpi_battery_get_state(battery);
-			if (result) {
-				ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-						"acpi_battery_get_state() failed"));
-			}
-		}
-		if (data_type == DATA_TYPE_STATE) {
-			goto event;
-		}
-		if (sbs_zombie(sbs)) {
-			goto end;
-		}
-
-		if ((data_type == DATA_TYPE_COMMON
-		     || data_type == DATA_TYPE_ALARM)
-		    && new_battery_present) {
-			result = acpi_battery_get_alarm(battery);
-			if (result) {
-				ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-						"acpi_battery_get_alarm() "
-						"failed"));
-			}
-		}
-		if (data_type == DATA_TYPE_ALARM) {
-			continue;
-		}
-		if (sbs_zombie(sbs)) {
-			goto end;
-		}
-
-	      event:
-
-		if (old_battery_present != new_battery_present || do_ac_init ||
-		    old_remaining_capacity !=
-		    battery->state.remaining_capacity) {
-			sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
-			result = acpi_sbs_generate_event(sbs->device,
-							 ACPI_SBS_BATTERY_NOTIFY_STATUS,
-							 new_battery_present,
-							 dir_name,
-							 ACPI_BATTERY_CLASS);
-			if (result) {
-				ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-						"acpi_sbs_generate_event() "
-						"failed"));
-			}
+	int id;
+	struct acpi_sbs *sbs = context;
+	struct acpi_battery *bat;
+	u8 saved_charger_state = sbs->charger_present;
+	u8 saved_battery_state;
+	acpi_ac_get_present(sbs);
+	if (sbs->charger_present != saved_charger_state) {
+#ifdef CONFIG_ACPI_PROC_EVENT
+		acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
+					      ACPI_SBS_NOTIFY_STATUS,
+					      sbs->charger_present);
+#endif
+		kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
+	}
+	if (sbs->manager_present) {
+		for (id = 0; id < MAX_SBS_BAT; ++id) {
+			if (!(sbs->batteries_supported & (1 << id)))
+				continue;
+			bat = &sbs->battery[id];
+			saved_battery_state = bat->present;
+			acpi_battery_read(bat);
+			if (saved_battery_state == bat->present)
+				continue;
+#ifdef CONFIG_ACPI_PROC_EVENT
+			acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
+						      bat->name,
+						      ACPI_SBS_NOTIFY_STATUS,
+						      bat->present);
+#endif
+			kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 		}
 	}
-
-      end:
-
-	return result;
 }
 
-static void acpi_sbs_update_time(void *data)
-{
-	struct acpi_sbs *sbs = data;
-	unsigned long delay = -1;
-	int result;
-	unsigned int up_tm = update_time;
-
-	if (sbs_mutex_lock(sbs))
-		return;
-
-	result = acpi_sbs_update_run(sbs, -1, DATA_TYPE_COMMON);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_sbs_update_run() failed"));
-	}
-
-	if (sbs_zombie(sbs)) {
-		goto end;
-	}
-
-	if (!up_tm) {
-		if (timer_pending(&sbs->update_timer))
-			del_timer(&sbs->update_timer);
-	} else {
-		delay = (up_tm > UPDATE_DELAY ? UPDATE_DELAY : up_tm);
-		delay = jiffies + HZ * delay;
-		if (timer_pending(&sbs->update_timer)) {
-			mod_timer(&sbs->update_timer, delay);
-		} else {
-			sbs->update_timer.data = (unsigned long)data;
-			sbs->update_timer.function = acpi_sbs_update_time_run;
-			sbs->update_timer.expires = delay;
-			add_timer(&sbs->update_timer);
-		}
-	}
-
-      end:
-
-	sbs_mutex_unlock(sbs);
-}
+static int acpi_sbs_remove(struct acpi_device *device, int type);
 
 static int acpi_sbs_add(struct acpi_device *device)
 {
-	struct acpi_sbs *sbs = NULL;
-	int result = 0, remove_result = 0;
+	struct acpi_sbs *sbs;
+	int result = 0;
 	int id;
-	acpi_status status = AE_OK;
-	unsigned long val;
-
-	status =
-	    acpi_evaluate_integer(device->handle, "_EC", NULL, &val);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Error obtaining _EC"));
-		return -EIO;
-	}
 
 	sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 	if (!sbs) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "kzalloc() failed"));
 		result = -ENOMEM;
 		goto end;
 	}
 
-	mutex_init(&sbs->mutex);
-
-	sbs_mutex_lock(sbs);
+	mutex_init(&sbs->lock);
 
-	sbs->base = 0xff & (val >> 8);
+	sbs->hc = acpi_driver_data(device->parent);
 	sbs->device = device;
-
 	strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 	acpi_driver_data(device) = sbs;
 
-	result = acpi_ac_add(sbs);
-	if (result) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "acpi_ac_add() failed"));
-		goto end;
-	}
-
-	acpi_sbsm_get_info(sbs);
-
-	if (!sbs->sbsm_present) {
-		result = acpi_battery_add(sbs, 0);
-		if (result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_battery_add() failed"));
-			goto end;
-		}
-	} else {
-		for (id = 0; id < MAX_SBS_BAT; id++) {
-			if ((sbs->sbsm_batteries_supported & (1 << id))) {
-				result = acpi_battery_add(sbs, id);
-				if (result) {
-					ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-							"acpi_battery_add() failed"));
-					goto end;
-				}
-			}
-		}
-	}
-
-	init_timer(&sbs->update_timer);
-	result = acpi_check_update_proc(sbs);
+	result = acpi_charger_add(sbs);
 	if (result)
 		goto end;
 
+	result = acpi_manager_get_info(sbs);
+	if (!result) {
+		sbs->manager_present = 1;
+		for (id = 0; id < MAX_SBS_BAT; ++id)
+			if ((sbs->batteries_supported & (1 << id)))
+				acpi_battery_add(sbs, id);
+	} else
+		acpi_battery_add(sbs, 0);
+	acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
       end:
-
-	sbs_mutex_unlock(sbs);
-
-	if (result) {
-		remove_result = acpi_sbs_remove(device, 0);
-		if (remove_result) {
-			ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-					"acpi_sbs_remove() failed"));
-		}
-	}
-
+	if (result)
+		acpi_sbs_remove(device, 0);
 	return result;
 }
 
@@ -1713,39 +947,25 @@ static int acpi_sbs_remove(struct acpi_device *device, int type)
 	struct acpi_sbs *sbs;
 	int id;
 
-	if (!device) {
+	if (!device)
 		return -EINVAL;
-	}
-
 	sbs = acpi_driver_data(device);
-	if (!sbs) {
+	if (!sbs)
 		return -EINVAL;
-	}
-
-	sbs_mutex_lock(sbs);
-
-	sbs->zombie = 1;
-	del_timer_sync(&sbs->update_timer);
-	acpi_os_wait_events_complete(NULL);
-	del_timer_sync(&sbs->update_timer);
-
-	for (id = 0; id < MAX_SBS_BAT; id++) {
+	mutex_lock(&sbs->lock);
+	acpi_smbus_unregister_callback(sbs->hc);
+	for (id = 0; id < MAX_SBS_BAT; ++id)
 		acpi_battery_remove(sbs, id);
-	}
-
-	acpi_ac_remove(sbs);
-
-	sbs_mutex_unlock(sbs);
-
-	mutex_destroy(&sbs->mutex);
-
+	acpi_charger_remove(sbs);
+	mutex_unlock(&sbs->lock);
+	mutex_destroy(&sbs->lock);
 	kfree(sbs);
-
 	return 0;
 }
 
 static void acpi_sbs_rmdirs(void)
 {
+#ifdef CONFIG_ACPI_PROCFS
 	if (acpi_ac_dir) {
 		acpi_unlock_ac_dir(acpi_ac_dir);
 		acpi_ac_dir = NULL;
@@ -1754,69 +974,58 @@ static void acpi_sbs_rmdirs(void)
 		acpi_unlock_battery_dir(acpi_battery_dir);
 		acpi_battery_dir = NULL;
 	}
+#endif
 }
 
 static int acpi_sbs_resume(struct acpi_device *device)
 {
 	struct acpi_sbs *sbs;
-
 	if (!device)
 		return -EINVAL;
-
 	sbs = device->driver_data;
-
-	sbs->run_cnt = 0;
-
+	acpi_sbs_callback(sbs);
 	return 0;
 }
 
+static struct acpi_driver acpi_sbs_driver = {
+	.name = "sbs",
+	.class = ACPI_SBS_CLASS,
+	.ids = sbs_device_ids,
+	.ops = {
+		.add = acpi_sbs_add,
+		.remove = acpi_sbs_remove,
+		.resume = acpi_sbs_resume,
+		},
+};
+
 static int __init acpi_sbs_init(void)
 {
 	int result = 0;
 
 	if (acpi_disabled)
 		return -ENODEV;
-
-	if (capacity_mode != DEF_CAPACITY_UNIT
-	    && capacity_mode != MAH_CAPACITY_UNIT
-	    && capacity_mode != MWH_CAPACITY_UNIT) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"invalid capacity_mode = %d", capacity_mode));
-		return -EINVAL;
-	}
-
+#ifdef CONFIG_ACPI_PROCFS
 	acpi_ac_dir = acpi_lock_ac_dir();
-	if (!acpi_ac_dir) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_lock_ac_dir() failed"));
+	if (!acpi_ac_dir)
 		return -ENODEV;
-	}
-
 	acpi_battery_dir = acpi_lock_battery_dir();
 	if (!acpi_battery_dir) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_lock_battery_dir() failed"));
 		acpi_sbs_rmdirs();
 		return -ENODEV;
 	}
-
+#endif
 	result = acpi_bus_register_driver(&acpi_sbs_driver);
 	if (result < 0) {
-		ACPI_EXCEPTION((AE_INFO, AE_ERROR,
-				"acpi_bus_register_driver() failed"));
 		acpi_sbs_rmdirs();
 		return -ENODEV;
 	}
-
 	return 0;
 }
 
 static void __exit acpi_sbs_exit(void)
 {
 	acpi_bus_unregister_driver(&acpi_sbs_driver);
-
 	acpi_sbs_rmdirs();
-
 	return;
 }
 
diff --git a/drivers/acpi/sbshc.c b/drivers/acpi/sbshc.c
new file mode 100644
index 0000000..046d7c3
--- /dev/null
+++ b/drivers/acpi/sbshc.c
@@ -0,0 +1,309 @@
+/*
+ * SMBus driver for ACPI Embedded Controller (v0.1)
+ *
+ * Copyright (c) 2007 Alexey Starikovskiy
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 2.
+ */
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/actypes.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include "sbshc.h"
+
+#define ACPI_SMB_HC_CLASS	"smbus_host_controller"
+#define ACPI_SMB_HC_DEVICE_NAME	"ACPI SMBus HC"
+
+struct acpi_smb_hc {
+	struct acpi_ec *ec;
+	struct mutex lock;
+	wait_queue_head_t wait;
+	u8 offset;
+	u8 query_bit;
+	smbus_alarm_callback callback;
+	void *context;
+};
+
+static int acpi_smbus_hc_add(struct acpi_device *device);
+static int acpi_smbus_hc_remove(struct acpi_device *device, int type);
+
+static const struct acpi_device_id sbs_device_ids[] = {
+	{"ACPI0001", 0},
+	{"ACPI0005", 0},
+	{"", 0},
+};
+
+MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
+
+static struct acpi_driver acpi_smb_hc_driver = {
+	.name = "smbus_hc",
+	.class = ACPI_SMB_HC_CLASS,
+	.ids = sbs_device_ids,
+	.ops = {
+		.add = acpi_smbus_hc_add,
+		.remove = acpi_smbus_hc_remove,
+		},
+};
+
+union acpi_smb_status {
+	u8 raw;
+	struct {
+		u8 status:5;
+		u8 reserved:1;
+		u8 alarm:1;
+		u8 done:1;
+	} fields;
+};
+
+enum acpi_smb_status_codes {
+	SMBUS_OK = 0,
+	SMBUS_UNKNOWN_FAILURE = 0x07,
+	SMBUS_DEVICE_ADDRESS_NACK = 0x10,
+	SMBUS_DEVICE_ERROR = 0x11,
+	SMBUS_DEVICE_COMMAND_ACCESS_DENIED = 0x12,
+	SMBUS_UNKNOWN_ERROR = 0x13,
+	SMBUS_DEVICE_ACCESS_DENIED = 0x17,
+	SMBUS_TIMEOUT = 0x18,
+	SMBUS_HOST_UNSUPPORTED_PROTOCOL = 0x19,
+	SMBUS_BUSY = 0x1a,
+	SMBUS_PEC_ERROR = 0x1f,
+};
+
+enum acpi_smb_offset {
+	ACPI_SMB_PROTOCOL = 0,	/* protocol, PEC */
+	ACPI_SMB_STATUS = 1,	/* status */
+	ACPI_SMB_ADDRESS = 2,	/* address */
+	ACPI_SMB_COMMAND = 3,	/* command */
+	ACPI_SMB_DATA = 4,	/* 32 data registers */
+	ACPI_SMB_BLOCK_COUNT = 0x24,	/* number of data bytes */
+	ACPI_SMB_ALARM_ADDRESS = 0x25,	/* alarm address */
+	ACPI_SMB_ALARM_DATA = 0x26,	/* 2 bytes alarm data */
+};
+
+static inline int smb_hc_read(struct acpi_smb_hc *hc, u8 address, u8 *data)
+{
+	return ec_read(hc->offset + address, data);
+}
+
+static inline int smb_hc_write(struct acpi_smb_hc *hc, u8 address, u8 data)
+{
+	return ec_write(hc->offset + address, data);
+}
+
+static inline int smb_check_done(struct acpi_smb_hc *hc)
+{
+	union acpi_smb_status status = {.raw = 0};
+	smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw);
+	return status.fields.done && (status.fields.status == SMBUS_OK);
+}
+
+static int wait_transaction_complete(struct acpi_smb_hc *hc, int timeout)
+{
+	if (wait_event_timeout(hc->wait, smb_check_done(hc),
+			       msecs_to_jiffies(timeout)))
+		return 0;
+	else
+		return -ETIME;
+}
+
+int acpi_smbus_transaction(struct acpi_smb_hc *hc, u8 protocol, u8 address,
+		    u8 command, u8 *data, u8 length)
+{
+	int ret = -EFAULT, i;
+	u8 temp, sz = 0;
+
+	mutex_lock(&hc->lock);
+	if (smb_hc_read(hc, ACPI_SMB_PROTOCOL, &temp))
+		goto end;
+	if (temp) {
+		ret = -EBUSY;
+		goto end;
+	}
+	smb_hc_write(hc, ACPI_SMB_COMMAND, command);
+	smb_hc_write(hc, ACPI_SMB_COMMAND, command);
+	if (!(protocol & 0x01)) {
+		smb_hc_write(hc, ACPI_SMB_BLOCK_COUNT, length);
+		for (i = 0; i < length; ++i)
+			smb_hc_write(hc, ACPI_SMB_DATA + i, data[i]);
+	}
+	smb_hc_write(hc, ACPI_SMB_ADDRESS, address << 1);
+	smb_hc_write(hc, ACPI_SMB_PROTOCOL, protocol);
+	/*
+	 * Wait for completion. Save the status code, data size,
+	 * and data into the return package (if required by the protocol).
+	 */
+	ret = wait_transaction_complete(hc, 1000);
+	if (ret || !(protocol & 0x01))
+		goto end;
+	switch (protocol) {
+	case SMBUS_RECEIVE_BYTE:
+	case SMBUS_READ_BYTE:
+		sz = 1;
+		break;
+	case SMBUS_READ_WORD:
+		sz = 2;
+		break;
+	case SMBUS_READ_BLOCK:
+		if (smb_hc_read(hc, ACPI_SMB_BLOCK_COUNT, &sz)) {
+			ret = -EFAULT;
+			goto end;
+		}
+		sz &= 0x1f;
+		break;
+	}
+	for (i = 0; i < sz; ++i)
+		smb_hc_read(hc, ACPI_SMB_DATA + i, &data[i]);
+      end:
+	mutex_unlock(&hc->lock);
+	return ret;
+}
+
+int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,
+		    u8 command, u8 *data)
+{
+	return acpi_smbus_transaction(hc, protocol, address, command, data, 0);
+}
+
+EXPORT_SYMBOL_GPL(acpi_smbus_read);
+
+int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 address,
+		     u8 command, u8 *data, u8 length)
+{
+	return acpi_smbus_transaction(hc, protocol, address, command, data, length);
+}
+
+EXPORT_SYMBOL_GPL(acpi_smbus_write);
+
+int acpi_smbus_register_callback(struct acpi_smb_hc *hc,
+			         smbus_alarm_callback callback, void *context)
+{
+	mutex_lock(&hc->lock);
+	hc->callback = callback;
+	hc->context = context;
+	mutex_unlock(&hc->lock);
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(acpi_smbus_register_callback);
+
+int acpi_smbus_unregister_callback(struct acpi_smb_hc *hc)
+{
+	mutex_lock(&hc->lock);
+	hc->callback = NULL;
+	hc->context = NULL;
+	mutex_unlock(&hc->lock);
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(acpi_smbus_unregister_callback);
+
+static void acpi_smbus_callback(void *context)
+{
+	struct acpi_smb_hc *hc = context;
+
+	if (hc->callback)
+		hc->callback(hc->context);
+}
+
+static int smbus_alarm(void *context)
+{
+	struct acpi_smb_hc *hc = context;
+	union acpi_smb_status status;
+	if (smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw))
+		return 0;
+	/* Check if it is only a completion notify */
+	if (status.fields.done)
+		wake_up(&hc->wait);
+	if (!status.fields.alarm)
+		return 0;
+	mutex_lock(&hc->lock);
+	smb_hc_write(hc, ACPI_SMB_STATUS, status.raw);
+	if (hc->callback)
+		acpi_os_execute(OSL_GPE_HANDLER, acpi_smbus_callback, hc);
+	mutex_unlock(&hc->lock);
+	return 0;
+}
+
+typedef int (*acpi_ec_query_func) (void *data);
+
+extern int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
+			      acpi_handle handle, acpi_ec_query_func func,
+			      void *data);
+
+static int acpi_smbus_hc_add(struct acpi_device *device)
+{
+	int status;
+	unsigned long val;
+	struct acpi_smb_hc *hc;
+
+	if (!device)
+		return -EINVAL;
+
+	status = acpi_evaluate_integer(device->handle, "_EC", NULL, &val);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_ERR PREFIX "error obtaining _EC.\n");
+		return -EIO;
+	}
+
+	strcpy(acpi_device_name(device), ACPI_SMB_HC_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_SMB_HC_CLASS);
+
+	hc = kzalloc(sizeof(struct acpi_smb_hc), GFP_KERNEL);
+	if (!hc)
+		return -ENOMEM;
+	mutex_init(&hc->lock);
+	init_waitqueue_head(&hc->wait);
+
+	hc->ec = acpi_driver_data(device->parent);
+	hc->offset = (val >> 8) & 0xff;
+	hc->query_bit = val & 0xff;
+	acpi_driver_data(device) = hc;
+
+	acpi_ec_add_query_handler(hc->ec, hc->query_bit, NULL, smbus_alarm, hc);
+	printk(KERN_INFO PREFIX "SBS HC: EC = 0x%p, offset = 0x%0x, query_bit = 0x%0x\n",
+		hc->ec, hc->offset, hc->query_bit);
+
+	return 0;
+}
+
+extern void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
+
+static int acpi_smbus_hc_remove(struct acpi_device *device, int type)
+{
+	struct acpi_smb_hc *hc;
+
+	if (!device)
+		return -EINVAL;
+
+	hc = acpi_driver_data(device);
+	acpi_ec_remove_query_handler(hc->ec, hc->query_bit);
+	kfree(hc);
+	return 0;
+}
+
+static int __init acpi_smb_hc_init(void)
+{
+	int result;
+
+	result = acpi_bus_register_driver(&acpi_smb_hc_driver);
+	if (result < 0)
+		return -ENODEV;
+	return 0;
+}
+
+static void __exit acpi_smb_hc_exit(void)
+{
+	acpi_bus_unregister_driver(&acpi_smb_hc_driver);
+}
+
+module_init(acpi_smb_hc_init);
+module_exit(acpi_smb_hc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexey Starikovskiy");
+MODULE_DESCRIPTION("ACPI SMBus HC driver");
diff --git a/drivers/acpi/sbshc.h b/drivers/acpi/sbshc.h
new file mode 100644
index 0000000..3bda349
--- /dev/null
+++ b/drivers/acpi/sbshc.h
@@ -0,0 +1,27 @@
+struct acpi_smb_hc;
+enum acpi_smb_protocol {
+	SMBUS_WRITE_QUICK = 2,
+	SMBUS_READ_QUICK = 3,
+	SMBUS_SEND_BYTE = 4,
+	SMBUS_RECEIVE_BYTE = 5,
+	SMBUS_WRITE_BYTE = 6,
+	SMBUS_READ_BYTE = 7,
+	SMBUS_WRITE_WORD  = 8,
+	SMBUS_READ_WORD  = 9,
+	SMBUS_WRITE_BLOCK = 0xa,
+	SMBUS_READ_BLOCK = 0xb,
+	SMBUS_PROCESS_CALL = 0xc,
+	SMBUS_BLOCK_PROCESS_CALL = 0xd,
+};
+
+static const u8 SMBUS_PEC = 0x80;
+
+typedef void (*smbus_alarm_callback)(void *context);
+
+extern int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,
+	       u8 command, u8 * data);
+extern int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 slave_address,
+		u8 command, u8 * data, u8 length);
+extern int acpi_smbus_register_callback(struct acpi_smb_hc *hc,
+			         smbus_alarm_callback callback, void *context);
+extern int acpi_smbus_unregister_callback(struct acpi_smb_hc *hc);
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 048295e..f3d3867 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -44,7 +44,6 @@ int acpi_sleep_prepare(u32 acpi_state)
 	ACPI_FLUSH_CPU_CACHE();
 	acpi_enable_wakeup_device_prep(acpi_state);
 #endif
-	acpi_gpe_sleep_prepare(acpi_state);
 	acpi_enter_sleep_state_prep(acpi_state);
 	return 0;
 }
@@ -268,6 +267,11 @@ static void acpi_hibernation_leave(void)
 
 static void acpi_hibernation_finish(void)
 {
+	/*
+	 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
+	 * enable it here.
+	 */
+	acpi_enable();
 	acpi_leave_sleep_state(ACPI_STATE_S4);
 	acpi_disable_wakeup_device(ACPI_STATE_S4);
 
diff --git a/drivers/acpi/sleep/sleep.h b/drivers/acpi/sleep/sleep.h
index ff1f850..a2ea125 100644
--- a/drivers/acpi/sleep/sleep.h
+++ b/drivers/acpi/sleep/sleep.h
@@ -5,6 +5,5 @@ extern int acpi_suspend (u32 state);
 extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
 extern void acpi_enable_wakeup_device(u8 sleep_state);
 extern void acpi_disable_wakeup_device(u8 sleep_state);
-extern void acpi_gpe_sleep_prepare(u32 sleep_state);
 
 extern int acpi_sleep_prepare(u32 acpi_state);
diff --git a/drivers/acpi/sleep/wakeup.c b/drivers/acpi/sleep/wakeup.c
index 97c27dd..ed8e41b 100644
--- a/drivers/acpi/sleep/wakeup.c
+++ b/drivers/acpi/sleep/wakeup.c
@@ -64,36 +64,29 @@ void acpi_enable_wakeup_device(u8 sleep_state)
 	ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device");
 	spin_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
-		struct acpi_device *dev = container_of(node,
-						       struct acpi_device,
-						       wakeup_list);
-
+		struct acpi_device *dev =
+			container_of(node, struct acpi_device, wakeup_list);
+		if (!dev->wakeup.flags.valid)
+			continue;
 		/* If users want to disable run-wake GPE,
 		 * we only disable it for wake and leave it for runtime
 		 */
-		if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
-			spin_unlock(&acpi_device_lock);
-			acpi_set_gpe_type(dev->wakeup.gpe_device,
-					  dev->wakeup.gpe_number,
-					  ACPI_GPE_TYPE_RUNTIME);
-			/* Re-enable it, since set_gpe_type will disable it */
-			acpi_enable_gpe(dev->wakeup.gpe_device,
-					dev->wakeup.gpe_number, ACPI_ISR);
-			spin_lock(&acpi_device_lock);
+		if (!dev->wakeup.state.enabled ||
+		    sleep_state > (u32) dev->wakeup.sleep_state) {
+			if (dev->wakeup.flags.run_wake) {
+				spin_unlock(&acpi_device_lock);
+				/* set_gpe_type will disable GPE, leave it like that */
+				acpi_set_gpe_type(dev->wakeup.gpe_device,
+						  dev->wakeup.gpe_number,
+						  ACPI_GPE_TYPE_RUNTIME);
+				spin_lock(&acpi_device_lock);
+			}
 			continue;
 		}
-
-		if (!dev->wakeup.flags.valid ||
-		    !dev->wakeup.state.enabled ||
-		    (sleep_state > (u32) dev->wakeup.sleep_state))
-			continue;
-
 		spin_unlock(&acpi_device_lock);
-		/* run-wake GPE has been enabled */
 		if (!dev->wakeup.flags.run_wake)
 			acpi_enable_gpe(dev->wakeup.gpe_device,
 					dev->wakeup.gpe_number, ACPI_ISR);
-		dev->wakeup.state.active = 1;
 		spin_lock(&acpi_device_lock);
 	}
 	spin_unlock(&acpi_device_lock);
@@ -112,26 +105,25 @@ void acpi_disable_wakeup_device(u8 sleep_state)
 
 	spin_lock(&acpi_device_lock);
 	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
-		struct acpi_device *dev = container_of(node,
-						       struct acpi_device,
-						       wakeup_list);
+		struct acpi_device *dev =
+			container_of(node, struct acpi_device, wakeup_list);
 
-		if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
-			spin_unlock(&acpi_device_lock);
-			acpi_set_gpe_type(dev->wakeup.gpe_device,
-					  dev->wakeup.gpe_number,
-					  ACPI_GPE_TYPE_WAKE_RUN);
-			/* Re-enable it, since set_gpe_type will disable it */
-			acpi_enable_gpe(dev->wakeup.gpe_device,
-					dev->wakeup.gpe_number, ACPI_NOT_ISR);
-			spin_lock(&acpi_device_lock);
+		if (!dev->wakeup.flags.valid)
 			continue;
-		}
-
-		if (!dev->wakeup.flags.valid ||
-		    !dev->wakeup.state.active ||
-		    (sleep_state > (u32) dev->wakeup.sleep_state))
+		if (!dev->wakeup.state.enabled ||
+		    sleep_state > (u32) dev->wakeup.sleep_state) {
+			if (dev->wakeup.flags.run_wake) {
+				spin_unlock(&acpi_device_lock);
+				acpi_set_gpe_type(dev->wakeup.gpe_device,
+						  dev->wakeup.gpe_number,
+						  ACPI_GPE_TYPE_WAKE_RUN);
+				/* Re-enable it, since set_gpe_type will disable it */
+				acpi_enable_gpe(dev->wakeup.gpe_device,
+						dev->wakeup.gpe_number, ACPI_NOT_ISR);
+				spin_lock(&acpi_device_lock);
+			}
 			continue;
+		}
 
 		spin_unlock(&acpi_device_lock);
 		acpi_disable_wakeup_device_power(dev);
@@ -142,7 +134,6 @@ void acpi_disable_wakeup_device(u8 sleep_state)
 			acpi_clear_gpe(dev->wakeup.gpe_device,
 				       dev->wakeup.gpe_number, ACPI_NOT_ISR);
 		}
-		dev->wakeup.state.active = 0;
 		spin_lock(&acpi_device_lock);
 	}
 	spin_unlock(&acpi_device_lock);
@@ -160,48 +151,20 @@ static int __init acpi_wakeup_device_init(void)
 		struct acpi_device *dev = container_of(node,
 						       struct acpi_device,
 						       wakeup_list);
-
 		/* In case user doesn't load button driver */
-		if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
-			spin_unlock(&acpi_device_lock);
-			acpi_set_gpe_type(dev->wakeup.gpe_device,
-					  dev->wakeup.gpe_number,
-					  ACPI_GPE_TYPE_WAKE_RUN);
-			acpi_enable_gpe(dev->wakeup.gpe_device,
-					dev->wakeup.gpe_number, ACPI_NOT_ISR);
-			dev->wakeup.state.enabled = 1;
-			spin_lock(&acpi_device_lock);
-		}
+		if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
+			continue;
+		spin_unlock(&acpi_device_lock);
+		acpi_set_gpe_type(dev->wakeup.gpe_device,
+				  dev->wakeup.gpe_number,
+				  ACPI_GPE_TYPE_WAKE_RUN);
+		acpi_enable_gpe(dev->wakeup.gpe_device,
+				dev->wakeup.gpe_number, ACPI_NOT_ISR);
+		dev->wakeup.state.enabled = 1;
+		spin_lock(&acpi_device_lock);
 	}
 	spin_unlock(&acpi_device_lock);
-
 	return 0;
 }
 
 late_initcall(acpi_wakeup_device_init);
-
-/*
- * Disable all wakeup GPEs before entering requested sleep state.
- *	@sleep_state:	ACPI state
- * Since acpi_enter_sleep_state() will disable all
- * RUNTIME GPEs, we simply mark all GPES that
- * are not enabled for wakeup from requested state as RUNTIME.
- */
-void acpi_gpe_sleep_prepare(u32 sleep_state)
-{
-	struct list_head *node, *next;
-
-	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
-		struct acpi_device *dev = container_of(node,
-						       struct acpi_device,
-						       wakeup_list);
-
-		/* The GPE can wakeup system from this state, don't touch it */
-		if ((u32) dev->wakeup.sleep_state >= sleep_state)
-			continue;
-		/* acpi_set_gpe_type will automatically disable GPE */
-		acpi_set_gpe_type(dev->wakeup.gpe_device,
-				  dev->wakeup.gpe_number,
-				  ACPI_GPE_TYPE_RUNTIME);
-	}
-}
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c
index 8cc9492..5f1d85f 100644
--- a/drivers/acpi/tables/tbutils.c
+++ b/drivers/acpi/tables/tbutils.c
@@ -400,7 +400,7 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
 	u32 table_count;
 	struct acpi_table_header *table;
 	acpi_physical_address address;
-	acpi_physical_address rsdt_address;
+	acpi_physical_address uninitialized_var(rsdt_address);
 	u32 length;
 	u8 *table_entry;
 	acpi_status status;
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index ad898e1..5f79b44 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -195,6 +195,7 @@ struct acpi_thermal {
 	struct acpi_thermal_trips trips;
 	struct acpi_handle_list devices;
 	struct timer_list timer;
+	struct mutex lock;
 };
 
 static const struct file_operations acpi_thermal_state_fops = {
@@ -711,6 +712,7 @@ static void acpi_thermal_check(void *data)
 	int result = 0;
 	struct acpi_thermal *tz = data;
 	unsigned long sleep_time = 0;
+	unsigned long timeout_jiffies = 0;
 	int i = 0;
 	struct acpi_thermal_state state;
 
@@ -720,11 +722,15 @@ static void acpi_thermal_check(void *data)
 		return;
 	}
 
+	/* Check if someone else is already running */
+	if (!mutex_trylock(&tz->lock))
+		return;
+
 	state = tz->state;
 
 	result = acpi_thermal_get_temperature(tz);
 	if (result)
-		return;
+		goto unlock;
 
 	memset(&tz->state, 0, sizeof(tz->state));
 
@@ -787,10 +793,13 @@ static void acpi_thermal_check(void *data)
 	 * a thermal event occurs).  Note that _TSP and _TZD values are
 	 * given in 1/10th seconds (we must covert to milliseconds).
 	 */
-	if (tz->state.passive)
+	if (tz->state.passive) {
 		sleep_time = tz->trips.passive.tsp * 100;
-	else if (tz->polling_frequency > 0)
+		timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
+	} else if (tz->polling_frequency > 0) {
 		sleep_time = tz->polling_frequency * 100;
+		timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
+	}
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 			  tz->name, tz->temperature, sleep_time));
@@ -804,17 +813,16 @@ static void acpi_thermal_check(void *data)
 			del_timer(&(tz->timer));
 	} else {
 		if (timer_pending(&(tz->timer)))
-			mod_timer(&(tz->timer),
-					jiffies + (HZ * sleep_time) / 1000);
+			mod_timer(&(tz->timer), timeout_jiffies);
 		else {
 			tz->timer.data = (unsigned long)tz;
 			tz->timer.function = acpi_thermal_run;
-			tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
+			tz->timer.expires = timeout_jiffies;
 			add_timer(&(tz->timer));
 		}
 	}
-
-	return;
+      unlock:
+	mutex_unlock(&tz->lock);
 }
 
 /* --------------------------------------------------------------------------
@@ -1251,7 +1259,7 @@ static int acpi_thermal_add(struct acpi_device *device)
 	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
 	acpi_driver_data(device) = tz;
-
+	mutex_init(&tz->lock);
 	result = acpi_thermal_get_info(tz);
 	if (result)
 		goto end;
@@ -1321,7 +1329,7 @@ static int acpi_thermal_remove(struct acpi_device *device, int type)
 	}
 
 	acpi_thermal_remove_fs(device);
-
+	mutex_destroy(&tz->lock);
 	kfree(tz);
 	return 0;
 }
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index b8a2095..bac956b 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -409,14 +409,17 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
-	int status;
+	int status = AE_OK;
 	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 	struct acpi_object_list args = { 1, &arg0 };
 
 
 	arg0.integer.value = level;
-	status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 
+	if (device->cap._BCM)
+		status = acpi_evaluate_object(device->dev->handle, "_BCM",
+					      &args, NULL);
+	device->brightness->curr = level;
 	return status;
 }
 
@@ -424,11 +427,11 @@ static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 					unsigned long *level)
 {
-	int status;
-
-	status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
-
-	return status;
+	if (device->cap._BQC)
+		return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
+					     level);
+	*level = device->brightness->curr;
+	return AE_OK;
 }
 
 static int
@@ -1633,9 +1636,20 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
 			  u32 level_current, u32 event)
 {
-	int min, max, min_above, max_below, i, l;
+	int min, max, min_above, max_below, i, l, delta = 255;
 	max = max_below = 0;
 	min = min_above = 255;
+	/* Find closest level to level_current */
+	for (i = 0; i < device->brightness->count; i++) {
+		l = device->brightness->levels[i];
+		if (abs(l - level_current) < abs(delta)) {
+			delta = l - level_current;
+			if (!delta)
+				break;
+		}
+	}
+	/* Ajust level_current to closest available level */
+	level_current += delta;
 	for (i = 0; i < device->brightness->count; i++) {
 		l = device->brightness->levels[i];
 		if (l < min)