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
  10 struct udevice;
  11
  12 enum {
  13         BACKLIGHT_MAX           = 100,
  14         BACKLIGHT_MIN           = 0,
  15         BACKLIGHT_OFF           = -1,
  16         BACKLIGHT_DEFAULT       = -2,
  17 };
  18
  19 struct 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  */
  46 int 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  */
  55 int backlight_set_brightness(struct udevice *dev, int percent);
  56
  57 #endif