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
65struct drm_device;
66struct i2c_adapter;
67
68ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
69 u8 offset, void *buffer, size_t size);
70ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
71 u8 offset, const void *buffer, size_t size);
72
73/**
74 * enum drm_lspcon_mode
75 * @DRM_LSPCON_MODE_INVALID: No LSPCON.
76 * @DRM_LSPCON_MODE_LS: Level shifter mode of LSPCON
77 * which drives DP++ to HDMI 1.4 conversion.
78 * @DRM_LSPCON_MODE_PCON: Protocol converter mode of LSPCON
79 * which drives DP++ to HDMI 2.0 active conversion.
80 */
81enum drm_lspcon_mode {
82 DRM_LSPCON_MODE_INVALID,
83 DRM_LSPCON_MODE_LS,
84 DRM_LSPCON_MODE_PCON,
85};
86
87/**
88 * enum drm_dp_dual_mode_type - Type of the DP dual mode adaptor
89 * @DRM_DP_DUAL_MODE_NONE: No DP dual mode adaptor
90 * @DRM_DP_DUAL_MODE_UNKNOWN: Could be either none or type 1 DVI adaptor
91 * @DRM_DP_DUAL_MODE_TYPE1_DVI: Type 1 DVI adaptor
92 * @DRM_DP_DUAL_MODE_TYPE1_HDMI: Type 1 HDMI adaptor
93 * @DRM_DP_DUAL_MODE_TYPE2_DVI: Type 2 DVI adaptor
94 * @DRM_DP_DUAL_MODE_TYPE2_HDMI: Type 2 HDMI adaptor
95 * @DRM_DP_DUAL_MODE_LSPCON: Level shifter / protocol converter
96 */
97enum drm_dp_dual_mode_type {
98 DRM_DP_DUAL_MODE_NONE,
99 DRM_DP_DUAL_MODE_UNKNOWN,
100 DRM_DP_DUAL_MODE_TYPE1_DVI,
101 DRM_DP_DUAL_MODE_TYPE1_HDMI,
102 DRM_DP_DUAL_MODE_TYPE2_DVI,
103 DRM_DP_DUAL_MODE_TYPE2_HDMI,
104 DRM_DP_DUAL_MODE_LSPCON,
105};
106
107enum drm_dp_dual_mode_type
108drm_dp_dual_mode_detect(const struct drm_device *dev, struct i2c_adapter *adapter);
109int drm_dp_dual_mode_max_tmds_clock(const struct drm_device *dev, enum drm_dp_dual_mode_type type,
110 struct i2c_adapter *adapter);
111int drm_dp_dual_mode_get_tmds_output(const struct drm_device *dev, enum drm_dp_dual_mode_type type,
112 struct i2c_adapter *adapter, bool *enabled);
113int drm_dp_dual_mode_set_tmds_output(const struct drm_device *dev, enum drm_dp_dual_mode_type type,
114 struct i2c_adapter *adapter, bool enable);
115const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type);
116
117int drm_lspcon_get_mode(const struct drm_device *dev, struct i2c_adapter *adapter,
118 enum drm_lspcon_mode *current_mode);
119int drm_lspcon_set_mode(const struct drm_device *dev, struct i2c_adapter *adapter,
120 enum drm_lspcon_mode reqd_mode, int time_out);
121#endif
122