/* SPDX-License-Identifier: GPL-2.0+ */

  /*
   * Copyright (c) 2016 Google, Inc
   * Written by Simon Glass <sjg@chromium.org>

   */
  
  #ifndef _BACKLIGHT_H
  #define _BACKLIGHT_H

  enum {
  	BACKLIGHT_MAX		= 100,
  	BACKLIGHT_MIN		= 0,
  	BACKLIGHT_OFF		= -1,
  	BACKLIGHT_DEFAULT	= -2,
  };

  struct backlight_ops {
  	/**
  	 * enable() - Enable a backlight
  	 *
  	 * @dev:	Backlight device to enable
  	 * @return 0 if OK, -ve on error
  	 */
  	int (*enable)(struct udevice *dev);

  
  	/**
  	 * set_brightness - Set brightness
  	 *
  	 * @dev:	Backlight device to update
  	 * @percent:	Brightness value (0 to 100, or BACKLIGHT_... value)
  	 * @return 0 if OK, -ve on error
  	 */
  	int (*set_brightness)(struct udevice *dev, int percent);

  };
  
  #define backlight_get_ops(dev)	((struct backlight_ops *)(dev)->driver->ops)
  
  /**
   * backlight_enable() - Enable a backlight
   *
   * @dev:	Backlight device to enable
   * @return 0 if OK, -ve on error
   */
  int backlight_enable(struct udevice *dev);

  /**
   * backlight_set_brightness - Set brightness
   *
   * @dev:	Backlight device to update
   * @percent:	Brightness value (0 to 100, or BACKLIGHT_... value)
   * @return 0 if OK, -ve on error
   */
  int backlight_set_brightness(struct udevice *dev, int percent);

  #endif