include/display.h

   1 /*
   2  * Copyright 2014 Google Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #ifndef _DISPLAY_H
   8 #define _DISPLAY_H
   9
  10 struct udevice;
  11 struct display_timing;
  12
  13 /**
  14  * Display uclass platform data for each device
  15  *
  16  * @source_id:  ID for the source of the display data, typically a video
  17  * controller
  18  * @src_dev:    Source device providing the video
  19  * @in_use:     Display is being used
  20  */
  21 struct display_plat {
  22         int source_id;
  23         struct udevice *src_dev;
  24         bool in_use;
  25 };
  26
  27 /**
  28  * display_read_timing() - Read timing information
  29  *
  30  * @dev:        Device to read from
  31  * @return 0 if OK, -ve on error
  32  */
  33 int display_read_timing(struct udevice *dev, struct display_timing *timing);
  34
  35 /**
  36  * display_port_enable() - Enable a display port device
  37  *
  38  * @dev:        Device to enable
  39  * @panel_bpp:  Number of bits per pixel for panel
  40  * @timing:     Display timings
  41  * @return 0 if OK, -ve on error
  42  */
  43 int display_enable(struct udevice *dev, int panel_bpp,
  44                    const struct display_timing *timing);
  45
  46 /**
  47  * display_in_use() - Check if a display is in use by any device
  48  *
  49  * @return true if the device is in use (display_enable() has been called
  50  * successfully), else false
  51  */
  52 bool display_in_use(struct udevice *dev);
  53
  54 struct dm_display_ops {
  55         /**
  56          * read_timing() - Read information directly
  57          *
  58          * @dev:        Device to read from
  59          * @timing:     Display timings
  60          * @return 0 if OK, -ve on error
  61          */
  62         int (*read_timing)(struct udevice *dev, struct display_timing *timing);
  63
  64         /**
  65          * read_edid() - Read information from EDID
  66          *
  67          * @dev:        Device to read from
  68          * @buf:        Buffer to read into (should be EDID_SIZE bytes)
  69          * @buf_size:   Buffer size (should be EDID_SIZE)
  70          * @return number of bytes read, <=0 for error
  71          */
  72         int (*read_edid)(struct udevice *dev, u8 *buf, int buf_size);
  73
  74         /**
  75          * enable() - Enable the display port device
  76          *
  77          * @dev:        Device to enable
  78          * @panel_bpp:  Number of bits per pixel for panel
  79          * @timing:     Display timings
  80          * @return 0 if OK, -ve on error
  81          */
  82         int (*enable)(struct udevice *dev, int panel_bpp,
  83                       const struct display_timing *timing);
  84 };
  85
  86 #define display_get_ops(dev)    ((struct dm_display_ops *)(dev)->driver->ops)
  87
  88 #endif