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Commit 8a681a4d authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

ACPI: video: create "brightness_switch_enabled" modparam 



Introduce new module parameter for brightness control.
"brightness_switch_enabled" is set by default which means
nothing changes upon brightness switch events.

When "brightness_switch_enabled" is cleared via
"echo 0 > /sys/module/video/parameters/brightness_switch_enabled",
ACPI will not try to change the brightness level any more.

Either X will take charge of this or users can change the brightness level
by poking /sys/class/backlight/acpi_videoX/...

Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 488b5ec8

drivers/acpi/video.c

+13 −5
Original line number Diff line number Diff line
@@ -72,6 +72,9 @@ MODULE_AUTHOR("Bruno Ducrot"); 
MODULE_DESCRIPTION("ACPI Video Driver");

MODULE_LICENSE("GPL");



static int brightness_switch_enabled = 1;

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);
@@ -1850,26 +1853,31 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 


	switch (event) {

	case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:	/* Cycle brightness */

		if (brightness_switch_enabled)

			acpi_video_switch_brightness(video_device, event);

		acpi_bus_generate_proc_event(device, event, 0);

		keycode = KEY_BRIGHTNESS_CYCLE;

		break;

	case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:	/* Increase brightness */

		if (brightness_switch_enabled)

			acpi_video_switch_brightness(video_device, event);

		acpi_bus_generate_proc_event(device, event, 0);

		keycode = KEY_BRIGHTNESSUP;

		break;

	case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:	/* Decrease brightness */

		if (brightness_switch_enabled)

			acpi_video_switch_brightness(video_device, event);

		acpi_bus_generate_proc_event(device, event, 0);

		keycode = KEY_BRIGHTNESSDOWN;

		break;

	case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:	/* zero brightnesss */

		if (brightness_switch_enabled)

			acpi_video_switch_brightness(video_device, event);

		acpi_bus_generate_proc_event(device, event, 0);

		keycode = KEY_BRIGHTNESS_ZERO;

		break;

	case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:	/* display device off */

		if (brightness_switch_enabled)

			acpi_video_switch_brightness(video_device, event);

		acpi_bus_generate_proc_event(device, event, 0);

		keycode = KEY_DISPLAY_OFF;