drivers/acpi/acpi_video.c

19 #include <linux/backlight.h>
203 	struct backlight_device *backlight;
221 /* backlight device sysfs support */
355 			if (device->backlight)
356 				device->backlight->props.brightness =
464 	 * that is the type of LCD can do the backlight control so we should not
465 	 * register backlight interface for other video output devices.
599 			 * the correct current backlight level in most cases.
600 			 * ACPI video backlight still works w/ buggy _BQC.
669  *			- a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
673  *			- a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
698  * Simple comparison function used to sort backlight levels.
943 	 * or an index). Set the backlight to max_level in this case.
1407 	if (!device->backlight)
1424 		backlight_force_update(device->backlight,
1607 		if (video_device->backlight)
1608 			backlight_force_update(video_device->backlight,
1666 		dev_info(&video->device->dev, "Restoring backlight state\n");
1731 	device->backlight = backlight_device_register(name,
1737 	if (IS_ERR(device->backlight)) {
1738 		device->backlight = NULL;
1746 	device->backlight->props.brightness =
1747 			acpi_video_get_brightness(device->backlight);
1792 	 * Do not create backlight device for video output
1831 	if (device->backlight) {
1832 		backlight_device_unregister(device->backlight);
1833 		device->backlight = NULL;
2045 	 * If backlight-type auto-detection is used then a native backlight may
2047 	 * Therefor normally the userspace visible /sys/class/backlight device
2050 	 * Register the backlight now when not using auto-detection, so that
2051 	 * when the kernel cmdline or DMI-quirks are used the backlight will