33  * When the core detect changes in for example brightness or power state
39  * - brightness         R/W, set the requested brightness level
40  * - actual_brightness  RO, the brightness level used by the HW
41  * - max_brightness     RO, the maximum  brightness level supported
51  * brightness, thus providing user-space access to the actual level
56  * When brightness is set by platform specific means, for example
58  * core that brightness has changed using backlight_force_update().
183 	return sprintf(buf, "%d\n", bd->props.brightness);  in brightness_show()
187 				    unsigned long brightness)  in backlight_device_set_brightness()  argument
193 		if (brightness > bd->props.max_brightness)  in backlight_device_set_brightness()
196 			pr_debug("set brightness to %lu\n", brightness);  in backlight_device_set_brightness()
197 			bd->props.brightness = brightness;  in backlight_device_set_brightness()
214 	unsigned long brightness;  in brightness_store()  local
216 	rc = kstrtoul(buf, 0, &brightness);  in brightness_store()
220 	rc = backlight_device_set_brightness(bd, brightness);  in brightness_store()
224 static DEVICE_ATTR_RW(brightness);
256 		rc = sprintf(buf, "%d\n", bd->props.brightness);  in actual_brightness_show()
341  * a hot-key. The updated brightness is read using get_brightness() and the
342  * brightness value is reported using an uevent.
347 	int brightness;  in backlight_force_update()  local
351 		brightness = bd->ops->get_brightness(bd);  in backlight_force_update()
352 		if (brightness >= 0)  in backlight_force_update()
353 			bd->props.brightness = brightness;  in backlight_force_update()
356 				"Could not update brightness from device: %pe\n",  in backlight_force_update()
357 				ERR_PTR(brightness));  in backlight_force_update()