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| author | Zhang Rui <rui.zhang@intel.com> | 2008-01-25 14:47:49 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-02-07 03:22:56 -0500 |
| commit | 8a681a4dee07ea09aedaadc6a2da28d2131dc414 (patch) | |
| tree | 051ace265079d74b815539be73599339d8c55b42 /drivers/acpi | |
| parent | 488b5ec871191359b9b79262a3d48456dae7ea5f (diff) | |
| download | lwn-8a681a4dee07ea09aedaadc6a2da28d2131dc414.tar.gz lwn-8a681a4dee07ea09aedaadc6a2da28d2131dc414.zip | |
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 <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/video.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index bd77e81e81c1..b1a56bf682ae 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; |