diff options
Diffstat (limited to 'drivers/acpi/acpi_video.c')
| -rw-r--r-- | drivers/acpi/acpi_video.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index e07782b1fbb6..43177c20ce4f 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -73,6 +73,7 @@ module_param(device_id_scheme, bool, 0444); static int only_lcd = -1; module_param(only_lcd, int, 0444); +static bool has_backlight; static int register_count; static DEFINE_MUTEX(register_count_mutex); static DEFINE_MUTEX(video_list_lock); @@ -1222,6 +1223,9 @@ acpi_video_bus_get_one_device(struct acpi_device *device, acpi_video_device_bind(video, data); acpi_video_device_find_cap(data); + if (data->cap._BCM && data->cap._BCL) + has_backlight = true; + mutex_lock(&video->device_list_lock); list_add_tail(&data->entry, &video->video_device_list); mutex_unlock(&video->device_list_lock); @@ -2249,6 +2253,7 @@ void acpi_video_unregister(void) if (register_count) { acpi_bus_unregister_driver(&acpi_video_bus); register_count = 0; + has_backlight = false; } mutex_unlock(®ister_count_mutex); } @@ -2270,13 +2275,7 @@ void acpi_video_unregister_backlight(void) bool acpi_video_handles_brightness_key_presses(void) { - bool have_video_busses; - - mutex_lock(&video_list_lock); - have_video_busses = !list_empty(&video_bus_head); - mutex_unlock(&video_list_lock); - - return have_video_busses && + return has_backlight && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); } EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); |