include/video_bridge.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (C) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #ifndef __VIDEO_BRIDGE
   8 #define __VIDEO_BRIDGE
   9
  10 #include <asm/gpio.h>
  11
  12 /**
  13  * struct video_bridge_priv - uclass information for video bridges
  14  *
  15  * @sleep:      GPIO to assert to power down the bridge
  16  * @reset:      GPIO to assert to reset the bridge
  17  * @hotplug:    Optional GPIO to check if bridge is connected
  18  */
  19 struct video_bridge_priv {
  20         struct gpio_desc sleep;
  21         struct gpio_desc reset;
  22         struct gpio_desc hotplug;
  23 };
  24
  25 /**
  26  * Operations for video bridges
  27  */
  28 struct video_bridge_ops {
  29         /**
  30          * attach() - attach a video bridge
  31          *
  32          * @return 0 if OK, -ve on error
  33          */
  34         int (*attach)(struct udevice *dev);
  35
  36         /**
  37          * check_attached() - check if a bridge is correctly attached
  38          *
  39          * This method is optional - if not provided then the hotplug GPIO
  40          * will be checked instead.
  41          *
  42          * @dev:        Device to check
  43          * @return 0 if attached, -EENOTCONN if not, or other -ve error
  44          */
  45         int (*check_attached)(struct udevice *dev);
  46
  47         /**
  48          * set_backlight() - Set the backlight brightness
  49          *
  50          * @dev:        device to adjust
  51          * @percent:    brightness percentage (0=off, 100=full brightness)
  52          * @return 0 if OK, -ve on error
  53          */
  54         int (*set_backlight)(struct udevice *dev, int percent);
  55
  56         /**
  57          * read_edid() - Read information from EDID
  58          *
  59          * @dev:        Device to read from
  60          * @buf:        Buffer to read into
  61          * @buf_size:   Buffer size
  62          * @return number of bytes read, <=0 for error
  63          */
  64         int (*read_edid)(struct udevice *dev, u8 *buf, int buf_size);
  65 };
  66
  67 #define video_bridge_get_ops(dev) \
  68                 ((struct video_bridge_ops *)(dev)->driver->ops)
  69
  70 /**
  71  * video_bridge_attach() - attach a video bridge
  72  *
  73  * @return 0 if OK, -ve on error
  74  */
  75 int video_bridge_attach(struct udevice *dev);
  76
  77 /**
  78  * video_bridge_set_backlight() - Set the backlight brightness
  79  *
  80  * @percent:    brightness percentage (0=off, 100=full brightness)
  81  * @return 0 if OK, -ve on error
  82  */
  83 int video_bridge_set_backlight(struct udevice *dev, int percent);
  84
  85 /**
  86  * video_bridge_set_active() - take the bridge in/out of reset/powerdown
  87  *
  88  * @dev:        Device to adjust
  89  * @active:     true to power up and reset, false to power down
  90  */
  91 int video_bridge_set_active(struct udevice *dev, bool active);
  92
  93 /**
  94  * check_attached() - check if a bridge is correctly attached
  95  *
  96  * @dev:        Device to check
  97  * @return 0 if attached, -EENOTCONN if not, or other -ve error
  98  */
  99 int video_bridge_check_attached(struct udevice *dev);
 100
 101 /**
 102  * video_bridge_read_edid() - Read information from EDID
 103  *
 104  * @dev:        Device to read from
 105  * @buf:        Buffer to read into
 106  * @buf_size:   Buffer size
 107  * @return number of bytes read, <=0 for error
 108  */
 109 int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size);
 110
 111 #endif