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path: root/drivers/hwmon/smsc47m1.c
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Diffstat (limited to 'drivers/hwmon/smsc47m1.c')
-rw-r--r--drivers/hwmon/smsc47m1.c153
1 files changed, 127 insertions, 26 deletions
diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
index 8ad50fd..9ca9781 100644
--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -136,11 +136,11 @@ struct smsc47m1_data {
struct smsc47m1_sio_data {
enum chips type;
+ u8 activate; /* Remember initial device state */
};
-static int smsc47m1_probe(struct platform_device *pdev);
-static int __devexit smsc47m1_remove(struct platform_device *pdev);
+static int __exit smsc47m1_remove(struct platform_device *pdev);
static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
int init);
@@ -160,8 +160,7 @@ static struct platform_driver smsc47m1_driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
},
- .probe = smsc47m1_probe,
- .remove = __devexit_p(smsc47m1_remove),
+ .remove = __exit_p(smsc47m1_remove),
};
static ssize_t get_fan(struct device *dev, struct device_attribute
@@ -470,24 +469,126 @@ static int __init smsc47m1_find(unsigned short *addr,
superio_select();
*addr = (superio_inb(SUPERIO_REG_BASE) << 8)
| superio_inb(SUPERIO_REG_BASE + 1);
- val = superio_inb(SUPERIO_REG_ACT);
- if (*addr == 0 || (val & 0x01) == 0) {
- pr_info(DRVNAME ": Device is disabled, will not use\n");
+ if (*addr == 0) {
+ pr_info(DRVNAME ": Device address not set, will not use\n");
superio_exit();
return -ENODEV;
}
+ /* Enable only if address is set (needed at least on the
+ * Compaq Presario S4000NX) */
+ sio_data->activate = superio_inb(SUPERIO_REG_ACT);
+ if ((sio_data->activate & 0x01) == 0) {
+ pr_info(DRVNAME ": Enabling device\n");
+ superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
+ }
+
superio_exit();
return 0;
}
-static int __devinit smsc47m1_probe(struct platform_device *pdev)
+/* Restore device to its initial state */
+static void __init smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
+{
+ if ((sio_data->activate & 0x01) == 0) {
+ superio_enter();
+ superio_select();
+
+ pr_info(DRVNAME ": Disabling device\n");
+ superio_outb(SUPERIO_REG_ACT, sio_data->activate);
+
+ superio_exit();
+ }
+}
+
+#define CHECK 1
+#define REQUEST 2
+#define RELEASE 3
+
+/*
+ * This function can be used to:
+ * - test for resource conflicts with ACPI
+ * - request the resources
+ * - release the resources
+ * We only allocate the I/O ports we really need, to minimize the risk of
+ * conflicts with ACPI or with other drivers.
+ */
+static int smsc47m1_handle_resources(unsigned short address, enum chips type,
+ int action, struct device *dev)
+{
+ static const u8 ports_m1[] = {
+ /* register, region length */
+ 0x04, 1,
+ 0x33, 4,
+ 0x56, 7,
+ };
+
+ static const u8 ports_m2[] = {
+ /* register, region length */
+ 0x04, 1,
+ 0x09, 1,
+ 0x2c, 2,
+ 0x35, 4,
+ 0x56, 7,
+ 0x69, 4,
+ };
+
+ int i, ports_size, err;
+ const u8 *ports;
+
+ switch (type) {
+ case smsc47m1:
+ default:
+ ports = ports_m1;
+ ports_size = ARRAY_SIZE(ports_m1);
+ break;
+ case smsc47m2:
+ ports = ports_m2;
+ ports_size = ARRAY_SIZE(ports_m2);
+ break;
+ }
+
+ for (i = 0; i + 1 < ports_size; i += 2) {
+ unsigned short start = address + ports[i];
+ unsigned short len = ports[i + 1];
+
+ switch (action) {
+ case CHECK:
+ /* Only check for conflicts */
+ err = acpi_check_region(start, len, DRVNAME);
+ if (err)
+ return err;
+ break;
+ case REQUEST:
+ /* Request the resources */
+ if (!request_region(start, len, DRVNAME)) {
+ dev_err(dev, "Region 0x%hx-0x%hx already in "
+ "use!\n", start, start + len);
+
+ /* Undo all requests */
+ for (i -= 2; i >= 0; i -= 2)
+ release_region(address + ports[i],
+ ports[i + 1]);
+ return -EBUSY;
+ }
+ break;
+ case RELEASE:
+ /* Release the resources */
+ release_region(start, len);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int __init smsc47m1_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct smsc47m1_sio_data *sio_data = dev->platform_data;
struct smsc47m1_data *data;
struct resource *res;
- int err = 0;
+ int err;
int fan1, fan2, fan3, pwm1, pwm2, pwm3;
static const char *names[] = {
@@ -496,12 +597,10 @@ static int __devinit smsc47m1_probe(struct platform_device *pdev)
};
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (!request_region(res->start, SMSC_EXTENT, DRVNAME)) {
- dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
- (unsigned long)res->start,
- (unsigned long)res->end);
- return -EBUSY;
- }
+ err = smsc47m1_handle_resources(res->start, sio_data->type,
+ REQUEST, dev);
+ if (err < 0)
+ return err;
if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
err = -ENOMEM;
@@ -637,11 +736,11 @@ error_free:
platform_set_drvdata(pdev, NULL);
kfree(data);
error_release:
- release_region(res->start, SMSC_EXTENT);
+ smsc47m1_handle_resources(res->start, sio_data->type, RELEASE, dev);
return err;
}
-static int __devexit smsc47m1_remove(struct platform_device *pdev)
+static int __exit smsc47m1_remove(struct platform_device *pdev)
{
struct smsc47m1_data *data = platform_get_drvdata(pdev);
struct resource *res;
@@ -650,7 +749,7 @@ static int __devexit smsc47m1_remove(struct platform_device *pdev)
sysfs_remove_group(&pdev->dev.kobj, &smsc47m1_group);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- release_region(res->start, SMSC_EXTENT);
+ smsc47m1_handle_resources(res->start, data->type, RELEASE, &pdev->dev);
platform_set_drvdata(pdev, NULL);
kfree(data);
@@ -717,7 +816,7 @@ static int __init smsc47m1_device_add(unsigned short address,
};
int err;
- err = acpi_check_resource_conflict(&res);
+ err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
if (err)
goto exit;
@@ -766,27 +865,29 @@ static int __init sm_smsc47m1_init(void)
if (smsc47m1_find(&address, &sio_data))
return -ENODEV;
- err = platform_driver_register(&smsc47m1_driver);
+ /* Sets global pdev as a side effect */
+ err = smsc47m1_device_add(address, &sio_data);
if (err)
goto exit;
- /* Sets global pdev as a side effect */
- err = smsc47m1_device_add(address, &sio_data);
+ err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
if (err)
- goto exit_driver;
+ goto exit_device;
return 0;
-exit_driver:
- platform_driver_unregister(&smsc47m1_driver);
+exit_device:
+ platform_device_unregister(pdev);
+ smsc47m1_restore(&sio_data);
exit:
return err;
}
static void __exit sm_smsc47m1_exit(void)
{
- platform_device_unregister(pdev);
platform_driver_unregister(&smsc47m1_driver);
+ smsc47m1_restore(pdev->dev.platform_data);
+ platform_device_unregister(pdev);
}
MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
generated by cgit v1.1 at 2024-10-30 09:32:53 +0000