From: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
Some machines seem to need the backlight brightness to be reset on resume.
Add support for doing so to the video module.
[akpm@xxxxxxxxxxxxxxxxxxxx: coding-style fixes]
Signed-off-by: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/video.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff -puN drivers/acpi/video.c~acpi-backlight-reset-brightness-on-resume drivers/acpi/video.c
--- a/drivers/acpi/video.c~acpi-backlight-reset-brightness-on-resume
+++ a/drivers/acpi/video.c
@@ -78,6 +78,7 @@ module_param(brightness_switch_enabled,
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},
@@ -92,6 +93,7 @@ static struct acpi_driver acpi_video_bus
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
+ .resume = acpi_video_resume,
},
};
@@ -1948,6 +1950,25 @@ static void acpi_video_device_notify(acp
}
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;
_
-
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