src/include/dp_aux.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef _DP_AUX_H_
   4 #define _DP_AUX_H_
   5
   6 #include <types.h>
   7
   8 enum {
   9         EDID_LENGTH         = 128,
  10         EDID_I2C_ADDR       = 0x50,
  11         EDID_EXTENSION_FLAG = 0x7e,
  12 };
  13
  14 enum i2c_over_aux {
  15         I2C_OVER_AUX_WRITE_MOT_0 = 0x0,
  16         I2C_OVER_AUX_READ_MOT_0 = 0x1,
  17         I2C_OVER_AUX_WRITE_STATUS_UPDATE_0 = 0x2,
  18         I2C_OVER_AUX_WRITE_MOT_1 = 0x4,
  19         I2C_OVER_AUX_READ_MOT_1 = 0x5,
  20         I2C_OVER_AUX_WRITE_STATUS_UPDATE_1 = 0x6,
  21         NATIVE_AUX_WRITE = 0x8,
  22         NATIVE_AUX_READ = 0x9,
  23 };
  24
  25 enum aux_request {
  26         DPCD_READ,
  27         DPCD_WRITE,
  28         I2C_RAW_READ,
  29         I2C_RAW_WRITE,
  30         I2C_RAW_READ_AND_STOP,
  31         I2C_RAW_WRITE_AND_STOP,
  32 };
  33
  34 /* Backlight configuration */
  35 #define DP_BACKLIGHT_MODE_SET                   0x721
  36 #define DP_BACKLIGHT_CONTROL_MODE_MASK          0x3
  37 #define DP_BACKLIGHT_CONTROL_MODE_DPCD          0x2
  38 #define DP_DISPLAY_CONTROL_REGISTER             0x720
  39 #define DP_BACKLIGHT_ENABLE                     0x1
  40 #define DP_BACKLIGHT_BRIGHTNESS_MSB             0x722
  41
  42 #define DP_AUX_MAX_PAYLOAD_BYTES        16
  43
  44
  45 bool dp_aux_request_is_write(enum aux_request request);
  46 enum i2c_over_aux dp_get_aux_cmd(enum aux_request request, uint32_t remaining_after_this);
  47
  48 #endif