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Commit 863c1490 authored by Matthew Garrett's avatar Matthew Garrett Committed by Len Brown
Browse files

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: default avatarMatthew Garrett <mjg59@srcf.ucam.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 7761f638

drivers/acpi/video.c

+21 −0
Original line number Diff line number Diff line
@@ -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_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[] = {

	{ACPI_VIDEO_HID, 0},
@@ -91,6 +92,7 @@ static struct acpi_driver acpi_video_bus = { 
	.ops = {

		.add = acpi_video_bus_add,

		.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 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)

{

	acpi_status status;