include/linux/backlight.h

1 /* SPDX-License-Identifier: GPL-2.0 */
5  * Copyright (C) 2003,2004 Hewlett-Packard Company
19  * enum backlight_update_reason - what method was used to update backlight
26 	 * @BACKLIGHT_UPDATE_HOTKEY: The backlight was updated using a hot-key.
37  * enum backlight_type - the type of backlight control
52 	 * The backlight is controlled using a platform-specific interface.
70  * enum backlight_notification - the type of notification
87 /** enum backlight_scale - the type of scale used for brightness values
89  * The type of scale used for brightness values.
93 	 * @BACKLIGHT_SCALE_UNKNOWN: The scale is unknown.
98 	 * @BACKLIGHT_SCALE_LINEAR: The scale is linear.
100 	 * The linear scale will increase brightness the same for each step.
105 	 * @BACKLIGHT_SCALE_NON_LINEAR: The scale is not linear.
108 	 * the relative perception of the eye demanding a non-linear scale.
116  * struct backlight_ops - backlight operations
178  * struct backlight_properties - backlight properties
212 	 * The possible values are: (0: full on, 4: full off), see
255 	 * @scale: The type of the brightness scale.
257 	enum backlight_scale scale;  member
261  * struct backlight_device - backlight device data
329  * backlight_update_status - force an update of the backlight device status
334 	int ret = -ENOENT;  in backlight_update_status()
336 	mutex_lock(&bd->update_lock);  in backlight_update_status()
337 	if (bd->ops && bd->ops->update_status)  in backlight_update_status()
338 		ret = bd->ops->update_status(bd);  in backlight_update_status()
339 	mutex_unlock(&bd->update_lock);  in backlight_update_status()
345  * backlight_enable - Enable backlight
353 	bd->props.power = BACKLIGHT_POWER_ON;  in backlight_enable()
354 	bd->props.state &= ~BL_CORE_FBBLANK;  in backlight_enable()
360  * backlight_disable - Disable backlight
368 	bd->props.power = BACKLIGHT_POWER_OFF;  in backlight_disable()
369 	bd->props.state |= BL_CORE_FBBLANK;  in backlight_disable()
375  * backlight_is_blank - Return true if display is expected to be blank
387 	return bd->props.power != BACKLIGHT_POWER_ON ||  in backlight_is_blank()
388 	       bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);  in backlight_is_blank()
392  * backlight_get_brightness - Returns the current brightness value
407 		return bd->props.brightness;  in backlight_get_brightness()
434  * bl_get_data - access devdata
447 	return dev_get_drvdata(&bl_dev->dev);  in bl_get_data()