include/display.h

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