LXR uboot/include/backlight.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * Copyright (c) 2016 Google, Inc
   4 * Written by Simon Glass <sjg@chromium.org>
   5 */
   6
   7#ifndef _BACKLIGHT_H
   8#define _BACKLIGHT_H
   9
  10struct udevice;
  11
  12enum {
  13        BACKLIGHT_MAX           = 100,
  14        BACKLIGHT_MIN           = 0,
  15        BACKLIGHT_OFF           = -1,
  16        BACKLIGHT_DEFAULT       = -2,
  17};
  18
  19struct backlight_ops {
  20        /**
  21         * enable() - Enable a backlight
  22         *
  23         * @dev:        Backlight device to enable
  24         * @return 0 if OK, -ve on error
  25         */
  26        int (*enable)(struct udevice *dev);
  27
  28        /**
  29         * set_brightness - Set brightness
  30         *
  31         * @dev:        Backlight device to update
  32         * @percent:    Brightness value (0 to 100, or BACKLIGHT_... value)
  33         * @return 0 if OK, -ve on error
  34         */
  35        int (*set_brightness)(struct udevice *dev, int percent);
  36};
  37
  38#define backlight_get_ops(dev)  ((struct backlight_ops *)(dev)->driver->ops)
  39
  40/**
  41 * backlight_enable() - Enable a backlight
  42 *
  43 * @dev:        Backlight device to enable
  44 * Return: 0 if OK, -ve on error
  45 */
  46int backlight_enable(struct udevice *dev);
  47
  48/**
  49 * backlight_set_brightness - Set brightness
  50 *
  51 * @dev:        Backlight device to update
  52 * @percent:    Brightness value (0 to 100, or BACKLIGHT_... value)
  53 * Return: 0 if OK, -ve on error
  54 */
  55int backlight_set_brightness(struct udevice *dev, int percent);
  56
  57#endif
  58