diff options
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 6a0143796772..416eb0303a83 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -44,6 +44,7 @@ #include <linux/dmi.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> +#include <linux/suspend.h> #define PREFIX "ACPI: " @@ -89,7 +90,6 @@ module_param(allow_duplicates, bool, 0644); static int register_count = 0; static int acpi_video_bus_add(struct acpi_device *device); static int acpi_video_bus_remove(struct acpi_device *device, int type); -static int acpi_video_resume(struct acpi_device *device); static void acpi_video_bus_notify(struct acpi_device *device, u32 event); static const struct acpi_device_id video_device_ids[] = { @@ -105,7 +105,6 @@ static struct acpi_driver acpi_video_bus = { .ops = { .add = acpi_video_bus_add, .remove = acpi_video_bus_remove, - .resume = acpi_video_resume, .notify = acpi_video_bus_notify, }, }; @@ -160,6 +159,7 @@ struct acpi_video_bus { struct proc_dir_entry *dir; struct input_dev *input; char phys[32]; /* for input device */ + struct notifier_block pm_nb; }; struct acpi_video_device_flags { @@ -1021,6 +1021,13 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) if (IS_ERR(device->backlight)) 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); + result = sysfs_create_link(&device->backlight->dev.kobj, &device->dev->dev.kobj, "device"); if (result) @@ -2236,24 +2243,31 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) return; } -static int instance; -static int acpi_video_resume(struct acpi_device *device) +static int acpi_video_resume(struct notifier_block *nb, + unsigned long val, void *ign) { struct acpi_video_bus *video; struct acpi_video_device *video_device; int i; - if (!device || !acpi_driver_data(device)) - return -EINVAL; + switch (val) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + case PM_RESTORE_PREPARE: + return NOTIFY_DONE; + } - video = acpi_driver_data(device); + video = container_of(nb, struct acpi_video_bus, pm_nb); + + dev_info(&video->device->dev, "Restoring backlight state\n"); for (i = 0; i < video->attached_count; i++) { video_device = video->attached_array[i].bind_info; if (video_device && video_device->backlight) acpi_video_set_brightness(video_device->backlight); } - return AE_OK; + + return NOTIFY_OK; } static acpi_status @@ -2277,6 +2291,8 @@ acpi_video_bus_match(acpi_handle handle, u32 level, void *context, return AE_OK; } +static int instance; + static int acpi_video_bus_add(struct acpi_device *device) { struct acpi_video_bus *video; @@ -2370,6 +2386,10 @@ static int acpi_video_bus_add(struct acpi_device *device) video->flags.rom ? "yes" : "no", video->flags.post ? "yes" : "no"); + video->pm_nb.notifier_call = acpi_video_resume; + video->pm_nb.priority = 0; + register_pm_notifier(&video->pm_nb); + return 0; err_free_input_dev: @@ -2396,6 +2416,8 @@ static int acpi_video_bus_remove(struct acpi_device *device, int type) video = acpi_driver_data(device); + unregister_pm_notifier(&video->pm_nb); + acpi_video_bus_stop_devices(video); acpi_video_bus_put_devices(video); acpi_video_bus_remove_fs(device); |