linux/include/drm/drm_dp_dual_mode_helper.h
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   1/*
   2 * Copyright \xC2\xA9 2016 Intel Corporation
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 */
  22
  23#ifndef DRM_DP_DUAL_MODE_HELPER_H
  24#define DRM_DP_DUAL_MODE_HELPER_H
  25
  26#include <linux/types.h>
  27
  28/*
  29 * Optional for type 1 DVI adaptors
  30 * Mandatory for type 1 HDMI and type 2 adaptors
  31 */
  32#define DP_DUAL_MODE_HDMI_ID 0x00 /* 00-0f */
  33#define  DP_DUAL_MODE_HDMI_ID_LEN 16
  34/*
  35 * Optional for type 1 adaptors
  36 * Mandatory for type 2 adaptors
  37 */
  38#define DP_DUAL_MODE_ADAPTOR_ID 0x10
  39#define  DP_DUAL_MODE_REV_MASK 0x07
  40#define  DP_DUAL_MODE_REV_TYPE2 0x00
  41#define  DP_DUAL_MODE_TYPE_MASK 0xf0
  42#define  DP_DUAL_MODE_TYPE_TYPE2 0xa0
  43/* This field is marked reserved in dual mode spec, used in LSPCON */
  44#define  DP_DUAL_MODE_TYPE_HAS_DPCD 0x08
  45#define DP_DUAL_MODE_IEEE_OUI 0x11 /* 11-13*/
  46#define  DP_DUAL_IEEE_OUI_LEN 3
  47#define DP_DUAL_DEVICE_ID 0x14 /* 14-19 */
  48#define  DP_DUAL_DEVICE_ID_LEN 6
  49#define DP_DUAL_MODE_HARDWARE_REV 0x1a
  50#define DP_DUAL_MODE_FIRMWARE_MAJOR_REV 0x1b
  51#define DP_DUAL_MODE_FIRMWARE_MINOR_REV 0x1c
  52#define DP_DUAL_MODE_MAX_TMDS_CLOCK 0x1d
  53#define DP_DUAL_MODE_I2C_SPEED_CAP 0x1e
  54#define DP_DUAL_MODE_TMDS_OEN 0x20
  55#define  DP_DUAL_MODE_TMDS_DISABLE 0x01
  56#define DP_DUAL_MODE_HDMI_PIN_CTRL 0x21
  57#define  DP_DUAL_MODE_CEC_ENABLE 0x01
  58#define DP_DUAL_MODE_I2C_SPEED_CTRL 0x22
  59
  60/* LSPCON specific registers, defined by MCA */
  61#define DP_DUAL_MODE_LSPCON_MODE_CHANGE         0x40
  62#define DP_DUAL_MODE_LSPCON_CURRENT_MODE                0x41
  63#define  DP_DUAL_MODE_LSPCON_MODE_PCON                  0x1
  64
  65struct i2c_adapter;
  66
  67ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
  68                              u8 offset, void *buffer, size_t size);
  69ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
  70                               u8 offset, const void *buffer, size_t size);
  71
  72/**
  73 * enum drm_lspcon_mode
  74 * @DRM_LSPCON_MODE_INVALID: No LSPCON.
  75 * @DRM_LSPCON_MODE_LS: Level shifter mode of LSPCON
  76 *      which drives DP++ to HDMI 1.4 conversion.
  77 * @DRM_LSPCON_MODE_PCON: Protocol converter mode of LSPCON
  78 *      which drives DP++ to HDMI 2.0 active conversion.
  79 */
  80enum drm_lspcon_mode {
  81        DRM_LSPCON_MODE_INVALID,
  82        DRM_LSPCON_MODE_LS,
  83        DRM_LSPCON_MODE_PCON,
  84};
  85
  86/**
  87 * enum drm_dp_dual_mode_type - Type of the DP dual mode adaptor
  88 * @DRM_DP_DUAL_MODE_NONE: No DP dual mode adaptor
  89 * @DRM_DP_DUAL_MODE_UNKNOWN: Could be either none or type 1 DVI adaptor
  90 * @DRM_DP_DUAL_MODE_TYPE1_DVI: Type 1 DVI adaptor
  91 * @DRM_DP_DUAL_MODE_TYPE1_HDMI: Type 1 HDMI adaptor
  92 * @DRM_DP_DUAL_MODE_TYPE2_DVI: Type 2 DVI adaptor
  93 * @DRM_DP_DUAL_MODE_TYPE2_HDMI: Type 2 HDMI adaptor
  94 * @DRM_DP_DUAL_MODE_LSPCON: Level shifter / protocol converter
  95 */
  96enum drm_dp_dual_mode_type {
  97        DRM_DP_DUAL_MODE_NONE,
  98        DRM_DP_DUAL_MODE_UNKNOWN,
  99        DRM_DP_DUAL_MODE_TYPE1_DVI,
 100        DRM_DP_DUAL_MODE_TYPE1_HDMI,
 101        DRM_DP_DUAL_MODE_TYPE2_DVI,
 102        DRM_DP_DUAL_MODE_TYPE2_HDMI,
 103        DRM_DP_DUAL_MODE_LSPCON,
 104};
 105
 106enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter);
 107int drm_dp_dual_mode_max_tmds_clock(enum drm_dp_dual_mode_type type,
 108                                    struct i2c_adapter *adapter);
 109int drm_dp_dual_mode_get_tmds_output(enum drm_dp_dual_mode_type type,
 110                                     struct i2c_adapter *adapter, bool *enabled);
 111int drm_dp_dual_mode_set_tmds_output(enum drm_dp_dual_mode_type type,
 112                                     struct i2c_adapter *adapter, bool enable);
 113const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type);
 114
 115int drm_lspcon_get_mode(struct i2c_adapter *adapter,
 116                        enum drm_lspcon_mode *current_mode);
 117int drm_lspcon_set_mode(struct i2c_adapter *adapter,
 118                        enum drm_lspcon_mode reqd_mode);
 119#endif
 120