From 8a681a4dee07ea09aedaadc6a2da28d2131dc414 Mon Sep 17 00:00:00 2001 From: Zhang Rui Date: Fri, 25 Jan 2008 14:47:49 +0800 Subject: 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: Zhang Rui Signed-off-by: Len Brown --- drivers/acpi/video.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index bd77e81e81c..b1a56bf682a 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -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); @@ -1850,27 +1853,32 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) switch (event) { case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ - acpi_video_switch_brightness(video_device, event); + 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 */ - acpi_video_switch_brightness(video_device, event); + 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 */ - acpi_video_switch_brightness(video_device, event); + 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 */ - acpi_video_switch_brightness(video_device, event); + 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 */ - acpi_video_switch_brightness(video_device, event); + if (brightness_switch_enabled) + acpi_video_switch_brightness(video_device, event); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_DISPLAY_OFF; break; -- cgit v1.2.3