include/drm/drm_dp_dual_mode_helper.h

   1 /*
   2  * Copyright © 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
  65 struct i2c_adapter;
  66
  67 ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
  68                               u8 offset, void *buffer, size_t size);
  69 ssize_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  */
  80 enum 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  */
  96 enum 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
 106 enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter);
 107 int drm_dp_dual_mode_max_tmds_clock(enum drm_dp_dual_mode_type type,
 108                                     struct i2c_adapter *adapter);
 109 int drm_dp_dual_mode_get_tmds_output(enum drm_dp_dual_mode_type type,
 110                                      struct i2c_adapter *adapter, bool *enabled);
 111 int drm_dp_dual_mode_set_tmds_output(enum drm_dp_dual_mode_type type,
 112                                      struct i2c_adapter *adapter, bool enable);
 113 const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type);
 114
 115 int drm_lspcon_get_mode(struct i2c_adapter *adapter,
 116                         enum drm_lspcon_mode *current_mode);
 117 int drm_lspcon_set_mode(struct i2c_adapter *adapter,
 118                         enum drm_lspcon_mode reqd_mode);
 119 #endif