1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* Support for OLPC XO-1.5 System Control Interrupts (SCI)
*
* Copyright (C) 2009-2010 One Laptop per Child
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/power_supply.h>
#include <linux/olpc-ec.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <asm/olpc.h>
#define DRV_NAME "olpc-xo15-sci"
#define PFX DRV_NAME ": "
#define XO15_SCI_CLASS DRV_NAME
#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
static unsigned long xo15_sci_gpe;
static bool lid_wake_on_close;
/*
* The normal ACPI LID wakeup behavior is wake-on-open, but not
* wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
*
* We provide here a sysfs attribute that will additionally enable
* wake-on-close behavior. This is useful (e.g.) when we oportunistically
* suspend with the display running; if the lid is then closed, we want to
* wake up to turn the display off.
*
* This is controlled through a custom method in the XO-1.5 DSDT.
*/
static int set_lid_wake_behavior(bool wake_on_close)
{
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = wake_on_close;
status = acpi_evaluate_object(NULL, "\\_SB.PCI0.LID.LIDW", &arg_list, NULL);
if (ACPI_FAILURE(status)) {
pr_warning(PFX "failed to set lid behavior\n");
return 1;
}
lid_wake_on_close = wake_on_close;
return 0;
}
static ssize_t
lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%u\n", lid_wake_on_close);
}
static ssize_t lid_wake_on_close_store(struct kobject *s,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned int val;
if (sscanf(buf, "%u", &val) != 1)
return -EINVAL;
set_lid_wake_behavior(!!val);
return n;
}
static struct kobj_attribute lid_wake_on_close_attr =
__ATTR(lid_wake_on_close, 0644,
lid_wake_on_close_show,
lid_wake_on_close_store);
static void battery_status_changed(void)
{
struct power_supply *psy = power_supply_get_by_name("olpc-battery");
if (psy) {
power_supply_changed(psy);
put_device(psy->dev);
}
}
static void ac_status_changed(void)
{
struct power_supply *psy = power_supply_get_by_name("olpc-ac");
if (psy) {
power_supply_changed(psy);
put_device(psy->dev);
}
}
static void process_sci_queue(void)
{
u16 data;
int r;
do {
r = olpc_ec_sci_query(&data);
if (r || !data)
break;
pr_debug(PFX "SCI 0x%x received\n", data);
switch (data) {
case EC_SCI_SRC_BATERR:
case EC_SCI_SRC_BATSOC:
case EC_SCI_SRC_BATTERY:
case EC_SCI_SRC_BATCRIT:
battery_status_changed();
break;
case EC_SCI_SRC_ACPWR:
ac_status_changed();
break;
}
} while (data);
if (r)
pr_err(PFX "Failed to clear SCI queue");
}
static void process_sci_queue_work(struct work_struct *work)
{
process_sci_queue();
}
static DECLARE_WORK(sci_work, process_sci_queue_work);
static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
{
schedule_work(&sci_work);
return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
}
static int xo15_sci_add(struct acpi_device *device)
{
unsigned long long tmp;
acpi_status status;
int r;
if (!device)
return -EINVAL;
strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
strcpy(acpi_device_class(device), XO15_SCI_CLASS);
/* Get GPE bit assignment (EC events). */
status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
if (ACPI_FAILURE(status))
return -EINVAL;
xo15_sci_gpe = tmp;
status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
ACPI_GPE_EDGE_TRIGGERED,
xo15_sci_gpe_handler, device);
if (ACPI_FAILURE(status))
return -ENODEV;
dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
if (r)
goto err_sysfs;
/* Flush queue, and enable all SCI events */
process_sci_queue();
olpc_ec_mask_write(EC_SCI_SRC_ALL);
acpi_enable_gpe(NULL, xo15_sci_gpe);
/* Enable wake-on-EC */
if (device->wakeup.flags.valid)
device_init_wakeup(&device->dev, true);
return 0;
err_sysfs:
acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
cancel_work_sync(&sci_work);
return r;
}
static int xo15_sci_remove(struct acpi_device *device, int type)
{
acpi_disable_gpe(NULL, xo15_sci_gpe);
acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
cancel_work_sync(&sci_work);
sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
return 0;
}
static int xo15_sci_resume(struct device *dev)
{
/* Enable all EC events */
olpc_ec_mask_write(EC_SCI_SRC_ALL);
/* Power/battery status might have changed */
battery_status_changed();
ac_status_changed();
return 0;
}
static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
static const struct acpi_device_id xo15_sci_device_ids[] = {
{"XO15EC", 0},
{"", 0},
};
static struct acpi_driver xo15_sci_drv = {
.name = DRV_NAME,
.class = XO15_SCI_CLASS,
.ids = xo15_sci_device_ids,
.ops = {
.add = xo15_sci_add,
.remove = xo15_sci_remove,
},
.drv.pm = &xo15_sci_pm,
};
static int __init xo15_sci_init(void)
{
return acpi_bus_register_driver(&xo15_sci_drv);
}
device_initcall(xo15_sci_init);
|
