diff options
| -rw-r--r-- | drivers/acpi/video.c | 123 |
1 files changed, 73 insertions, 50 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index d089c45..64c8893 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -631,6 +631,76 @@ acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) * device : video output device (LCD, CRT, ..) * * Return Value: + * Maximum brightness level + * + * Allocate and initialize device->brightness. + */ + +static int +acpi_video_init_brightness(struct acpi_video_device *device) +{ + union acpi_object *obj = NULL; + int i, max_level = 0, count = 0; + union acpi_object *o; + struct acpi_video_device_brightness *br = NULL; + + if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " + "LCD brightness level\n")); + goto out; + } + + if (obj->package.count < 2) + goto out; + + br = kzalloc(sizeof(*br), GFP_KERNEL); + if (!br) { + printk(KERN_ERR "can't allocate memory\n"); + goto out; + } + + br->levels = kmalloc(obj->package.count * sizeof *(br->levels), + GFP_KERNEL); + if (!br->levels) + goto out_free; + + for (i = 0; i < obj->package.count; i++) { + o = (union acpi_object *)&obj->package.elements[i]; + if (o->type != ACPI_TYPE_INTEGER) { + printk(KERN_ERR PREFIX "Invalid data\n"); + continue; + } + br->levels[count] = (u32) o->integer.value; + + if (br->levels[count] > max_level) + max_level = br->levels[count]; + count++; + } + + if (count < 2) + goto out_free_levels; + + br->count = count; + device->brightness = br; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count)); + kfree(obj); + return max_level; + +out_free_levels: + kfree(br->levels); +out_free: + kfree(br); +out: + device->brightness = NULL; + kfree(obj); + return 0; +} + +/* + * Arg: + * device : video output device (LCD, CRT, ..) + * + * Return Value: * None * * Find out all required AML methods defined under the output @@ -640,10 +710,7 @@ acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) static void acpi_video_device_find_cap(struct acpi_video_device *device) { acpi_handle h_dummy1; - int i; u32 max_level = 0; - union acpi_object *obj = NULL; - struct acpi_video_device_brightness *br = NULL; memset(&device->cap, 0, sizeof(device->cap)); @@ -672,53 +739,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) device->cap._DSS = 1; } - if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) { - - if (obj->package.count >= 2) { - int count = 0; - union acpi_object *o; - - br = kzalloc(sizeof(*br), GFP_KERNEL); - if (!br) { - printk(KERN_ERR "can't allocate memory\n"); - } else { - br->levels = kmalloc(obj->package.count * - sizeof *(br->levels), GFP_KERNEL); - if (!br->levels) - goto out; - - for (i = 0; i < obj->package.count; i++) { - o = (union acpi_object *)&obj->package. - elements[i]; - if (o->type != ACPI_TYPE_INTEGER) { - printk(KERN_ERR PREFIX "Invalid data\n"); - continue; - } - br->levels[count] = (u32) o->integer.value; - - if (br->levels[count] > max_level) - max_level = br->levels[count]; - count++; - } - out: - if (count < 2) { - kfree(br->levels); - kfree(br); - } else { - br->count = count; - device->brightness = br; - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "found %d brightness levels\n", - count)); - } - } - } - - } else { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n")); - } - - kfree(obj); + max_level = acpi_video_init_brightness(device); if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){ int result; @@ -1695,6 +1716,8 @@ static void acpi_video_switch_brightness(struct acpi_video_device *device, int event) { unsigned long level_current, level_next; + if (!device->brightness) + return; acpi_video_device_lcd_get_level_current(device, &level_current); level_next = acpi_video_get_next_level(device, level_current, event); acpi_video_device_lcd_set_level(device, level_next); |