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ACPI: video: reset brightness on resume 

Some machines seem to need the backlight brightness to be reset on resume.
Add support for doing so to the video module.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Matthew Garrett 2008-02-04 23:31:24 -08:00 committed by Len Brown
parent 7761f638f6
commit 863c1490e5
1 changed files with 21 additions and 0 deletions
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21
drivers/acpi/video.c
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@ -77,6 +77,7 @@ module_param(brightness_switch_enabled, bool, 0644);
static int acpi_video_bus_add(struct acpi_device *device); 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_bus_remove(struct acpi_device *device, int type);
static int acpi_video_resume(struct acpi_device *device);
static const struct acpi_device_id video_device_ids[] = { static const struct acpi_device_id video_device_ids[] = {
{ACPI_VIDEO_HID, 0}, {ACPI_VIDEO_HID, 0},
@ -91,6 +92,7 @@ static struct acpi_driver acpi_video_bus = {
.ops = { .ops = {
.add = acpi_video_bus_add, .add = acpi_video_bus_add,
.remove = acpi_video_bus_remove, .remove = acpi_video_bus_remove,
.resume = acpi_video_resume,
}, },
}; };
@ -1837,6 +1839,25 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
} }
static int instance; static int instance;
static int acpi_video_resume(struct acpi_device *device)
{
struct acpi_video_bus *video;
struct acpi_video_device *video_device;
int i;
if (!device || !acpi_driver_data(device))
return -EINVAL;
video = acpi_driver_data(device);
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;
}
static int acpi_video_bus_add(struct acpi_device *device) static int acpi_video_bus_add(struct acpi_device *device)
{ {
acpi_status status; acpi_status status;