aboutsummaryrefslogtreecommitdiffstats
path: root/include/drm/drm_edid.h
blob: a11cc9d32591efc8805eff11898d096143d67e8b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/*
 * Copyright © 2007-2008 Intel Corporation
 *   Jesse Barnes <jesse.barnes@intel.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef __DRM_EDID_H__
#define __DRM_EDID_H__

#include <linux/types.h>

#define EDID_LENGTH 128
#define DDC_ADDR 0x50

#ifdef BIG_ENDIAN
#error "EDID structure is little endian, need big endian versions"
#else

struct est_timings {
	u8 t1;
	u8 t2;
	u8 mfg_rsvd;
} __attribute__((packed));

struct std_timing {
	u8 hsize; /* need to multiply by 8 then add 248 */
	u8 vfreq:6; /* need to add 60 */
	u8 aspect_ratio:2; /* 00=16:10, 01=4:3, 10=5:4, 11=16:9 */
} __attribute__((packed));

/* If detailed data is pixel timing */
struct detailed_pixel_timing {
	u8 hactive_lo;
	u8 hblank_lo;
	u8 hblank_hi:4;
	u8 hactive_hi:4;
	u8 vactive_lo;
	u8 vblank_lo;
	u8 vblank_hi:4;
	u8 vactive_hi:4;
	u8 hsync_offset_lo;
	u8 hsync_pulse_width_lo;
	u8 vsync_pulse_width_lo:4;
	u8 vsync_offset_lo:4;
	u8 vsync_pulse_width_hi:2;
	u8 vsync_offset_hi:2;
	u8 hsync_pulse_width_hi:2;
	u8 hsync_offset_hi:2;
	u8 width_mm_lo;
	u8 height_mm_lo;
	u8 height_mm_hi:4;
	u8 width_mm_hi:4;
	u8 hborder;
	u8 vborder;
	u8 unknown0:1;
	u8 hsync_positive:1;
	u8 vsync_positive:1;
	u8 separate_sync:2;
	u8 stereo:1;
	u8 unknown6:1;
	u8 interlaced:1;
} __attribute__((packed));

/* If it's not pixel timing, it'll be one of the below */
struct detailed_data_string {
	u8 str[13];
} __attribute__((packed));

struct detailed_data_monitor_range {
	u8 min_vfreq;
	u8 max_vfreq;
	u8 min_hfreq_khz;
	u8 max_hfreq_khz;
	u8 pixel_clock_mhz; /* need to multiply by 10 */
	u16 sec_gtf_toggle; /* A000=use above, 20=use below */ /* FIXME: byte order */
	u8 hfreq_start_khz; /* need to multiply by 2 */
	u8 c; /* need to divide by 2 */
	u16 m; /* FIXME: byte order */
	u8 k;
	u8 j; /* need to divide by 2 */
} __attribute__((packed));

struct detailed_data_wpindex {
	u8 white_y_lo:2;
	u8 white_x_lo:2;
	u8 pad:4;
	u8 white_x_hi;
	u8 white_y_hi;
	u8 gamma; /* need to divide by 100 then add 1 */
} __attribute__((packed));

struct detailed_data_color_point {
	u8 windex1;
	u8 wpindex1[3];
	u8 windex2;
	u8 wpindex2[3];
} __attribute__((packed));

struct detailed_non_pixel {
	u8 pad1;
	u8 type; /* ff=serial, fe=string, fd=monitor range, fc=monitor name
		    fb=color point data, fa=standard timing data,
		    f9=undefined, f8=mfg. reserved */
	u8 pad2;
	union {
		struct detailed_data_string str;
		struct detailed_data_monitor_range range;
		struct detailed_data_wpindex color;
		struct std_timing timings[5];
	} data;
} __attribute__((packed));

#define EDID_DETAIL_STD_MODES 0xfa
#define EDID_DETAIL_MONITOR_CPDATA 0xfb
#define EDID_DETAIL_MONITOR_NAME 0xfc
#define EDID_DETAIL_MONITOR_RANGE 0xfd
#define EDID_DETAIL_MONITOR_STRING 0xfe
#define EDID_DETAIL_MONITOR_SERIAL 0xff

struct detailed_timing {
	u16 pixel_clock; /* need to multiply by 10 KHz */ /* FIXME: byte order */
	union {
		struct detailed_pixel_timing pixel_data;
		struct detailed_non_pixel other_data;
	} data;
} __attribute__((packed));

struct edid {
	u8 header[8];
	/* Vendor & product info */
	u8 mfg_id[2];
	u8 prod_code[2];
	u32 serial; /* FIXME: byte order */
	u8 mfg_week;
	u8 mfg_year;
	/* EDID version */
	u8 version;
	u8 revision;
	/* Display info: */
	/*   input definition */
	u8 serration_vsync:1;
	u8 sync_on_green:1;
	u8 composite_sync:1;
	u8 separate_syncs:1;
	u8 blank_to_black:1;
	u8 video_level:2;
	u8 digital:1; /* bits below must be zero if set */
	u8 width_cm;
	u8 height_cm;
	u8 gamma;
	/*   feature support */
	u8 default_gtf:1;
	u8 preferred_timing:1;
	u8 standard_color:1;
	u8 display_type:2; /* 00=mono, 01=rgb, 10=non-rgb, 11=unknown */
	u8 pm_active_off:1;
	u8 pm_suspend:1;
	u8 pm_standby:1;
	/* Color characteristics */
	u8 red_green_lo;
	u8 black_white_lo;
	u8 red_x;
	u8 red_y;
	u8 green_x;
	u8 green_y;
	u8 blue_x;
	u8 blue_y;
	u8 white_x;
	u8 white_y;
	/* Est. timings and mfg rsvd timings*/
	struct est_timings established_timings;
	/* Standard timings 1-8*/
	struct std_timing standard_timings[8];
	/* Detailing timings 1-4 */
	struct detailed_timing detailed_timings[4];
	/* Number of 128 byte ext. blocks */
	u8 extensions;
	/* Checksum */
	u8 checksum;
} __attribute__((packed));

#endif /* little endian structs */

#define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))

#endif /* __DRM_EDID_H__ */