1 /* 2 * Copyright 2003, Thomas Kurschel. All Rights Reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 6 7 /*! 8 Part of DDC driver 9 10 EDID decoder. 11 12 The EDID information is tightly packed; this file takes care of 13 converting it to a usable structure. 14 */ 15 16 17 #include "edid.h" 18 19 #include <KernelExport.h> 20 21 #include <string.h> 22 23 24 // 25 // from hereon a bunch of decoders follow for each EDID section 26 // 27 28 static void 29 decode_vendor(edid1_vendor *vendor, const edid1_vendor_raw *raw) 30 { 31 vendor->manufacturer[0] = raw->c1 + '@'; 32 vendor->manufacturer[1] = ((raw->c2_high << 3) | raw->c2_low) + '@'; 33 vendor->manufacturer[2] = raw->c3 + '@'; 34 vendor->manufacturer[3] = 0; 35 vendor->prod_id = B_LENDIAN_TO_HOST_INT16(raw->prod_id); 36 vendor->serial = B_LENDIAN_TO_HOST_INT32(raw->serial); 37 vendor->week = raw->week; 38 vendor->year = raw->year + 1990; 39 } 40 41 42 static void 43 decode_version(edid1_version *version, const edid1_version_raw *raw) 44 { 45 version->version = raw->version; 46 version->revision = raw->revision; 47 } 48 49 50 static void 51 decode_display(edid1_display *display, const edid1_display_raw *raw) 52 { 53 // We need to dig into one of the union to get the first 54 // bit which should always align. then we can pick the right 55 // data structure to parse. 56 display->input_type = raw->analog_params.input_type; 57 58 if (display->input_type != 0) { 59 // digital 60 display->digital_params.bit_depth = 0; 61 if (raw->digital_params.bit_depth > 0 && raw->digital_params.bit_depth < 7) 62 display->digital_params.bit_depth = raw->digital_params.bit_depth * 2 + 4; 63 display->digital_params.interface = raw->digital_params.interface; 64 } else { 65 // analog 66 display->analog_params.input_voltage = raw->analog_params.input_voltage; 67 display->analog_params.setup = raw->analog_params.setup; 68 display->analog_params.sep_sync = raw->analog_params.sep_sync; 69 display->analog_params.comp_sync = raw->analog_params.comp_sync; 70 display->analog_params.sync_on_green = raw->analog_params.sync_on_green; 71 display->analog_params.sync_serr = raw->analog_params.sync_serr; 72 } 73 74 display->h_size = raw->h_size; 75 display->v_size = raw->v_size; 76 display->gamma = raw->gamma; 77 78 display->dpms_standby = raw->dpms_standby; 79 display->dpms_suspend = raw->dpms_suspend; 80 display->dpms_off = raw->dpms_off; 81 display->display_type = raw->display_type; 82 display->std_colour_space = raw->std_colour_space; 83 display->preferred_timing_mode = raw->preferred_timing_mode; 84 display->gtf_supported = raw->gtf_supported; 85 86 display->red_x = ((uint16)raw->red_x << 2) | raw->red_x_low; 87 display->red_y = ((uint16)raw->red_y << 2) | raw->red_y_low; 88 display->green_x = ((uint16)raw->green_x << 2) | raw->green_x_low; 89 display->green_y = ((uint16)raw->green_y << 2) | raw->green_y_low; 90 display->blue_x = ((uint16)raw->blue_x << 2) | raw->blue_x_low; 91 display->blue_y = ((uint16)raw->blue_y << 2) | raw->blue_y_low; 92 display->white_x = ((uint16)raw->white_x << 2) | raw->white_x_low; 93 display->white_y = ((uint16)raw->white_y << 2) | raw->white_y_low; 94 } 95 96 97 static void 98 decode_std_timing(edid1_std_timing *timing, const edid1_std_timing_raw *raw) 99 { 100 timing->h_size = (raw->timing.h_size + 31) * 8; 101 timing->ratio = raw->timing.ratio; 102 103 switch (raw->timing.ratio) { 104 case 0: 105 timing->v_size = timing->h_size; 106 break; 107 108 case 1: 109 timing->v_size = timing->h_size * 3 / 4; 110 break; 111 112 case 2: 113 timing->v_size = timing->h_size * 4 / 5; 114 break; 115 116 case 3: 117 timing->v_size = timing->h_size * 9 / 16; 118 break; 119 } 120 timing->refresh = raw->timing.refresh + 60; 121 timing->id = raw->id; 122 } 123 124 125 static void 126 decode_whitepoint(edid1_whitepoint *whitepoint, const edid1_whitepoint_raw *raw) 127 { 128 whitepoint[0].index = raw->index1; 129 whitepoint[0].white_x = ((uint16)raw->white_x1 << 2) | raw->white_x1_low; 130 whitepoint[0].white_y = ((uint16)raw->white_y1 << 2) | raw->white_y1_low; 131 whitepoint[0].gamma = raw->gamma1; 132 133 whitepoint[1].index = raw->index2; 134 whitepoint[1].white_x = ((uint16)raw->white_x2 << 2) | raw->white_x2_low; 135 whitepoint[1].white_y = ((uint16)raw->white_y2 << 2) | raw->white_y2_low; 136 whitepoint[1].gamma = raw->gamma2; 137 } 138 139 140 static void 141 decode_detailed_timing(edid1_detailed_timing *timing, 142 const edid1_detailed_timing_raw *raw) 143 { 144 timing->pixel_clock = raw->pixel_clock; 145 timing->h_active = ((uint16)raw->h_active_high << 8) | raw->h_active; 146 timing->h_blank = ((uint16)raw->h_blank_high << 8) | raw->h_blank; 147 timing->v_active = ((uint16)raw->v_active_high << 8) | raw->v_active; 148 timing->v_blank = ((uint16)raw->v_blank_high << 8) | raw->v_blank; 149 timing->h_sync_off = ((uint16)raw->h_sync_off_high << 8) | raw->h_sync_off; 150 timing->h_sync_width = ((uint16)raw->h_sync_width_high << 8) | raw->h_sync_width; 151 timing->v_sync_off = ((uint16)raw->v_sync_off_high << 4) | raw->v_sync_off; 152 timing->v_sync_width = ((uint16)raw->v_sync_width_high << 4) | raw->v_sync_width; 153 timing->h_size = ((uint16)raw->h_size_high << 8) | raw->h_size; 154 timing->v_size = ((uint16)raw->v_size_high << 8) | raw->v_size; 155 timing->h_border = raw->h_border; 156 timing->v_border = raw->v_border; 157 timing->interlaced = raw->interlaced; 158 timing->stereo = raw->stereo; 159 timing->sync = raw->sync; 160 timing->misc = raw->misc; 161 } 162 163 164 //! copy string until 0xa, removing trailing spaces 165 static void 166 copy_str(char *dest, const uint8 *src, size_t len) 167 { 168 uint32 i; 169 170 // copy until 0xa 171 for (i = 0; i < len; i++) { 172 if (*src == 0xa) 173 break; 174 175 *dest++ = *src++; 176 } 177 178 // remove trailing spaces 179 while (i-- > 0) { 180 if (*(dest - 1) != ' ') 181 break; 182 183 dest--; 184 } 185 186 *dest = '\0'; 187 } 188 189 190 static void 191 decode_detailed_monitor(edid1_detailed_monitor *monitor, 192 const edid1_detailed_monitor_raw *raw, bool enableExtra) 193 { 194 int i, j; 195 196 for (i = 0; i < EDID1_NUM_DETAILED_MONITOR_DESC; ++i, ++monitor, ++raw) { 197 198 // workaround: normally, all four bytes must be zero for detailed 199 // description, but at least some Formac monitors violate that: 200 // they have some additional info that start at zero_4(!), 201 // so even if only the first two _or_ the other two bytes are 202 // zero, we accept it as a monitor description block 203 if (enableExtra 204 && ((raw->extra.zero_0[0] == 0 && raw->extra.zero_0[1] == 0) 205 || (raw->extra.zero_0[2] == 0 && raw->extra.zero_4 == 0))) { 206 monitor->monitor_desc_type = raw->extra.monitor_desc_type; 207 208 switch (raw->extra.monitor_desc_type) { 209 case EDID1_SERIAL_NUMBER: 210 copy_str(monitor->data.serial_number, 211 raw->extra.data.serial_number, EDID1_EXTRA_STRING_LEN); 212 break; 213 214 case EDID1_ASCII_DATA: 215 copy_str(monitor->data.ascii_data, 216 raw->extra.data.ascii_data, EDID1_EXTRA_STRING_LEN); 217 break; 218 219 case EDID1_MONITOR_RANGES: 220 monitor->data.monitor_range = raw->extra.data.monitor_range; 221 break; 222 223 case EDID1_MONITOR_NAME: 224 copy_str(monitor->data.monitor_name, 225 raw->extra.data.monitor_name, EDID1_EXTRA_STRING_LEN); 226 break; 227 228 case EDID1_ADD_COLOUR_POINTER: 229 decode_whitepoint(monitor->data.whitepoint, 230 &raw->extra.data.whitepoint); 231 break; 232 233 case EDID1_ADD_STD_TIMING: 234 for (j = 0; j < EDID1_NUM_EXTRA_STD_TIMING; ++j) { 235 decode_std_timing(&monitor->data.std_timing[j], 236 &raw->extra.data.std_timing[j]); 237 } 238 break; 239 } 240 } else if (raw->detailed_timing.pixel_clock > 0) { 241 monitor->monitor_desc_type = EDID1_IS_DETAILED_TIMING; 242 decode_detailed_timing(&monitor->data.detailed_timing, 243 &raw->detailed_timing); 244 } 245 } 246 } 247 248 249 // #pragma mark - 250 251 252 //! Main function to decode edid data 253 void 254 edid_decode(edid1_info *edid, const edid1_raw *raw) 255 { 256 int i; 257 memset(edid, 0, sizeof(edid1_info)); 258 259 decode_vendor(&edid->vendor, &raw->vendor); 260 decode_version(&edid->version, &raw->version); 261 decode_display(&edid->display, &raw->display); 262 263 edid->established_timing = raw->established_timing; 264 265 for (i = 0; i < EDID1_NUM_STD_TIMING; ++i) { 266 decode_std_timing(&edid->std_timing[i], &raw->std_timing[i]); 267 } 268 269 decode_detailed_monitor(edid->detailed_monitor, raw->detailed_monitor, 270 edid->version.version == 1 && edid->version.revision >= 1); 271 } 272