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-rw-r--r--drivers/acpi/video.c155
1 files changed, 89 insertions, 66 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f8bc5a755dd..cd4389262d4 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -68,7 +68,7 @@ MODULE_AUTHOR("Bruno Ducrot");
MODULE_DESCRIPTION("ACPI Video Driver");
MODULE_LICENSE("GPL");
-static bool brightness_switch_enabled = 1;
+static bool brightness_switch_enabled;
module_param(brightness_switch_enabled, bool, 0644);
/*
@@ -150,6 +150,7 @@ struct acpi_video_enumerated_device {
struct acpi_video_bus {
struct acpi_device *device;
+ bool backlight_registered;
u8 dos_setting;
struct acpi_video_enumerated_device *attached_array;
u8 attached_count;
@@ -1658,88 +1659,89 @@ acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
{
- if (acpi_video_verify_backlight_support()) {
- struct backlight_properties props;
- struct pci_dev *pdev;
- acpi_handle acpi_parent;
- struct device *parent = NULL;
- int result;
- static int count;
- char *name;
-
- result = acpi_video_init_brightness(device);
- if (result)
- return;
- name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
- if (!name)
- return;
- count++;
+ struct backlight_properties props;
+ struct pci_dev *pdev;
+ acpi_handle acpi_parent;
+ struct device *parent = NULL;
+ int result;
+ static int count;
+ char *name;
- acpi_get_parent(device->dev->handle, &acpi_parent);
+ result = acpi_video_init_brightness(device);
+ if (result)
+ return;
+ name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
+ if (!name)
+ return;
+ count++;
- pdev = acpi_get_pci_dev(acpi_parent);
- if (pdev) {
- parent = &pdev->dev;
- pci_dev_put(pdev);
- }
+ acpi_get_parent(device->dev->handle, &acpi_parent);
- memset(&props, 0, sizeof(struct backlight_properties));
- props.type = BACKLIGHT_FIRMWARE;
- props.max_brightness = device->brightness->count - 3;
- device->backlight = backlight_device_register(name,
- parent,
- device,
- &acpi_backlight_ops,
- &props);
- kfree(name);
- if (IS_ERR(device->backlight))
- return;
+ pdev = acpi_get_pci_dev(acpi_parent);
+ if (pdev) {
+ parent = &pdev->dev;
+ pci_dev_put(pdev);
+ }
- /*
- * Save current brightness level in case we have to restore it
- * before acpi_video_device_lcd_set_level() is called next time.
- */
- device->backlight->props.brightness =
- acpi_video_get_brightness(device->backlight);
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.type = BACKLIGHT_FIRMWARE;
+ props.max_brightness = device->brightness->count - 3;
+ device->backlight = backlight_device_register(name,
+ parent,
+ device,
+ &acpi_backlight_ops,
+ &props);
+ kfree(name);
+ if (IS_ERR(device->backlight))
+ return;
- device->cooling_dev = thermal_cooling_device_register("LCD",
- device->dev, &video_cooling_ops);
- if (IS_ERR(device->cooling_dev)) {
- /*
- * Set cooling_dev to NULL so we don't crash trying to
- * free it.
- * Also, why the hell we are returning early and
- * not attempt to register video output if cooling
- * device registration failed?
- * -- dtor
- */
- device->cooling_dev = NULL;
- return;
- }
+ /*
+ * Save current brightness level in case we have to restore it
+ * before acpi_video_device_lcd_set_level() is called next time.
+ */
+ device->backlight->props.brightness =
+ acpi_video_get_brightness(device->backlight);
- dev_info(&device->dev->dev, "registered as cooling_device%d\n",
- device->cooling_dev->id);
- result = sysfs_create_link(&device->dev->dev.kobj,
- &device->cooling_dev->device.kobj,
- "thermal_cooling");
- if (result)
- printk(KERN_ERR PREFIX "Create sysfs link\n");
- result = sysfs_create_link(&device->cooling_dev->device.kobj,
- &device->dev->dev.kobj, "device");
- if (result)
- printk(KERN_ERR PREFIX "Create sysfs link\n");
+ device->cooling_dev = thermal_cooling_device_register("LCD",
+ device->dev, &video_cooling_ops);
+ if (IS_ERR(device->cooling_dev)) {
+ /*
+ * Set cooling_dev to NULL so we don't crash trying to free it.
+ * Also, why the hell we are returning early and not attempt to
+ * register video output if cooling device registration failed?
+ * -- dtor
+ */
+ device->cooling_dev = NULL;
+ return;
}
+
+ dev_info(&device->dev->dev, "registered as cooling_device%d\n",
+ device->cooling_dev->id);
+ result = sysfs_create_link(&device->dev->dev.kobj,
+ &device->cooling_dev->device.kobj,
+ "thermal_cooling");
+ if (result)
+ printk(KERN_ERR PREFIX "Create sysfs link\n");
+ result = sysfs_create_link(&device->cooling_dev->device.kobj,
+ &device->dev->dev.kobj, "device");
+ if (result)
+ printk(KERN_ERR PREFIX "Create sysfs link\n");
}
static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
{
struct acpi_video_device *dev;
+ if (!acpi_video_verify_backlight_support())
+ return 0;
+
mutex_lock(&video->device_list_lock);
list_for_each_entry(dev, &video->video_device_list, entry)
acpi_video_dev_register_backlight(dev);
mutex_unlock(&video->device_list_lock);
+ video->backlight_registered = true;
+
video->pm_nb.notifier_call = acpi_video_resume;
video->pm_nb.priority = 0;
return register_pm_notifier(&video->pm_nb);
@@ -1767,13 +1769,20 @@ static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device
static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
{
struct acpi_video_device *dev;
- int error = unregister_pm_notifier(&video->pm_nb);
+ int error;
+
+ if (!video->backlight_registered)
+ return 0;
+
+ error = unregister_pm_notifier(&video->pm_nb);
mutex_lock(&video->device_list_lock);
list_for_each_entry(dev, &video->video_device_list, entry)
acpi_video_dev_unregister_backlight(dev);
mutex_unlock(&video->device_list_lock);
+ video->backlight_registered = false;
+
return error;
}
@@ -2061,6 +2070,20 @@ void acpi_video_unregister(void)
}
EXPORT_SYMBOL(acpi_video_unregister);
+void acpi_video_unregister_backlight(void)
+{
+ struct acpi_video_bus *video;
+
+ if (!register_count)
+ return;
+
+ mutex_lock(&video_list_lock);
+ list_for_each_entry(video, &video_bus_head, entry)
+ acpi_video_bus_unregister_backlight(video);
+ mutex_unlock(&video_list_lock);
+}
+EXPORT_SYMBOL(acpi_video_unregister_backlight);
+
/*
* This is kind of nasty. Hardware using Intel chipsets may require
* the video opregion code to be run first in order to initialise
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-25 15:55:22 +0000