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 enum {
  11         BACKLIGHT_MAX           = 100,
  12         BACKLIGHT_MIN           = 0,
  13         BACKLIGHT_OFF           = -1,
  14         BACKLIGHT_DEFAULT       = -2,
  15 };
  16
  17 struct backlight_ops {
  18         /**
  19          * enable() - Enable a backlight
  20          *
  21          * @dev:        Backlight device to enable
  22          * @return 0 if OK, -ve on error
  23          */
  24         int (*enable)(struct udevice *dev);
  25
  26         /**
  27          * set_brightness - Set brightness
  28          *
  29          * @dev:        Backlight device to update
  30          * @percent:    Brightness value (0 to 100, or BACKLIGHT_... value)
  31          * @return 0 if OK, -ve on error
  32          */
  33         int (*set_brightness)(struct udevice *dev, int percent);
  34 };
  35
  36 #define backlight_get_ops(dev)  ((struct backlight_ops *)(dev)->driver->ops)
  37
  38 /**
  39  * backlight_enable() - Enable a backlight
  40  *
  41  * @dev:        Backlight device to enable
  42  * @return 0 if OK, -ve on error
  43  */
  44 int backlight_enable(struct udevice *dev);
  45
  46 /**
  47  * backlight_set_brightness - Set brightness
  48  *
  49  * @dev:        Backlight device to update
  50  * @percent:    Brightness value (0 to 100, or BACKLIGHT_... value)
  51  * @return 0 if OK, -ve on error
  52  */
  53 int backlight_set_brightness(struct udevice *dev, int percent);
  54
  55 #endif