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 display->input_type = raw->input_type; 54 display->input_voltage = raw->input_voltage; 55 display->setup = raw->setup; 56 display->sep_sync = raw->sep_sync; 57 display->comp_sync = raw->comp_sync; 58 display->sync_on_green = raw->sync_on_green; 59 display->sync_serr = raw->sync_serr; 60 61 display->h_size = raw->h_size; 62 display->v_size = raw->v_size; 63 display->gamma = raw->gamma; 64 65 display->dpms_standby = raw->dpms_standby; 66 display->dpms_suspend = raw->dpms_suspend; 67 display->dpms_off = raw->dpms_off; 68 display->display_type = raw->display_type; 69 display->std_colour_space = raw->std_colour_space; 70 display->preferred_timing_mode = raw->preferred_timing_mode; 71 display->gtf_supported = raw->gtf_supported; 72 73 display->red_x = ((uint16)raw->red_x << 2) | raw->red_x_low; 74 display->red_y = ((uint16)raw->red_y << 2) | raw->red_y_low; 75 display->green_x = ((uint16)raw->green_x << 2) | raw->green_x_low; 76 display->green_y = ((uint16)raw->green_y << 2) | raw->green_y_low; 77 display->blue_x = ((uint16)raw->blue_x << 2) | raw->blue_x_low; 78 display->blue_y = ((uint16)raw->blue_y << 2) | raw->blue_y_low; 79 display->white_x = ((uint16)raw->white_x << 2) | raw->white_x_low; 80 display->white_y = ((uint16)raw->white_y << 2) | raw->white_y_low; 81 } 82 83 84 static void 85 decode_std_timing(edid1_std_timing *timing, const edid1_std_timing_raw *raw) 86 { 87 timing->h_size = (raw->timing.h_size + 31) * 8; 88 timing->ratio = raw->timing.ratio; 89 90 switch (raw->timing.ratio) { 91 case 0: 92 timing->v_size = timing->h_size; 93 break; 94 95 case 1: 96 timing->v_size = timing->h_size * 3 / 4; 97 break; 98 99 case 2: 100 timing->v_size = timing->h_size * 4 / 5; 101 break; 102 103 case 3: 104 timing->v_size = timing->h_size * 9 / 16; 105 break; 106 } 107 timing->refresh = raw->timing.refresh + 60; 108 timing->id = raw->id; 109 } 110 111 112 static void 113 decode_whitepoint(edid1_whitepoint *whitepoint, const edid1_whitepoint_raw *raw) 114 { 115 whitepoint[0].index = raw->index1; 116 whitepoint[0].white_x = ((uint16)raw->white_x1 << 2) | raw->white_x1_low; 117 whitepoint[0].white_y = ((uint16)raw->white_y1 << 2) | raw->white_y1_low; 118 whitepoint[0].gamma = raw->gamma1; 119 120 whitepoint[1].index = raw->index2; 121 whitepoint[1].white_x = ((uint16)raw->white_x2 << 2) | raw->white_x2_low; 122 whitepoint[1].white_y = ((uint16)raw->white_y2 << 2) | raw->white_y2_low; 123 whitepoint[1].gamma = raw->gamma2; 124 } 125 126 127 static void 128 decode_detailed_timing(edid1_detailed_timing *timing, 129 const edid1_detailed_timing_raw *raw) 130 { 131 timing->pixel_clock = raw->pixel_clock; 132 timing->h_active = ((uint16)raw->h_active_high << 8) | raw->h_active; 133 timing->h_blank = ((uint16)raw->h_blank_high << 8) | raw->h_blank; 134 timing->v_active = ((uint16)raw->v_active_high << 8) | raw->v_active; 135 timing->v_blank = ((uint16)raw->v_blank_high << 8) | raw->v_blank; 136 timing->h_sync_off = ((uint16)raw->h_sync_off_high << 8) | raw->h_sync_off; 137 timing->h_sync_width = ((uint16)raw->h_sync_width_high << 8) | raw->h_sync_width; 138 timing->v_sync_off = ((uint16)raw->v_sync_off_high << 4) | raw->v_sync_off; 139 timing->v_sync_width = ((uint16)raw->v_sync_width_high << 4) | raw->v_sync_width; 140 timing->h_size = ((uint16)raw->h_size_high << 8) | raw->h_size; 141 timing->v_size = ((uint16)raw->v_size_high << 8) | raw->v_size; 142 timing->h_border = raw->h_border; 143 timing->v_border = raw->v_border; 144 timing->interlaced = raw->interlaced; 145 timing->stereo = raw->stereo; 146 timing->sync = raw->sync; 147 timing->misc = raw->misc; 148 } 149 150 151 //! copy string until 0xa, removing trailing spaces 152 static void 153 copy_str(char *dest, const uint8 *src, size_t len) 154 { 155 uint32 i; 156 157 // copy until 0xa 158 for (i = 0; i < len; i++) { 159 if (*src == 0xa) 160 break; 161 162 *dest++ = *src++; 163 } 164 165 // remove trailing spaces 166 while (i-- > 0) { 167 if (*(dest - 1) != ' ') 168 break; 169 170 dest--; 171 } 172 173 *dest = '\0'; 174 } 175 176 177 static void 178 decode_detailed_monitor(edid1_detailed_monitor *monitor, 179 const edid1_detailed_monitor_raw *raw, bool enableExtra) 180 { 181 int i, j; 182 183 for (i = 0; i < EDID1_NUM_DETAILED_MONITOR_DESC; ++i, ++monitor, ++raw) { 184 185 // workaround: normally, all four bytes must be zero for detailed 186 // description, but at least some Formac monitors violate that: 187 // they have some additional info that start at zero_4(!), 188 // so even if only the first two _or_ the other two bytes are 189 // zero, we accept it as a monitor description block 190 if (enableExtra 191 && ((raw->extra.zero_0[0] == 0 && raw->extra.zero_0[1] == 0) 192 || (raw->extra.zero_0[2] == 0 && raw->extra.zero_4 == 0))) { 193 monitor->monitor_desc_type = raw->extra.monitor_desc_type; 194 195 switch (raw->extra.monitor_desc_type) { 196 case EDID1_SERIAL_NUMBER: 197 copy_str(monitor->data.serial_number, 198 raw->extra.data.serial_number, EDID1_EXTRA_STRING_LEN); 199 break; 200 201 case EDID1_ASCII_DATA: 202 copy_str(monitor->data.ascii_data, 203 raw->extra.data.ascii_data, EDID1_EXTRA_STRING_LEN); 204 break; 205 206 case EDID1_MONITOR_RANGES: 207 monitor->data.monitor_range = raw->extra.data.monitor_range; 208 break; 209 210 case EDID1_MONITOR_NAME: 211 copy_str(monitor->data.monitor_name, 212 raw->extra.data.monitor_name, EDID1_EXTRA_STRING_LEN); 213 break; 214 215 case EDID1_ADD_COLOUR_POINTER: 216 decode_whitepoint(monitor->data.whitepoint, 217 &raw->extra.data.whitepoint); 218 break; 219 220 case EDID1_ADD_STD_TIMING: 221 for (j = 0; j < EDID1_NUM_EXTRA_STD_TIMING; ++j) { 222 decode_std_timing(&monitor->data.std_timing[j], 223 &raw->extra.data.std_timing[j]); 224 } 225 break; 226 } 227 } else if (raw->detailed_timing.pixel_clock > 0) { 228 monitor->monitor_desc_type = EDID1_IS_DETAILED_TIMING; 229 decode_detailed_timing(&monitor->data.detailed_timing, 230 &raw->detailed_timing); 231 } 232 } 233 } 234 235 236 // #pragma mark - 237 238 239 //! Main function to decode edid data 240 void 241 edid_decode(edid1_info *edid, const edid1_raw *raw) 242 { 243 int i; 244 memset(edid, 0, sizeof(edid1_info)); 245 246 decode_vendor(&edid->vendor, &raw->vendor); 247 decode_version(&edid->version, &raw->version); 248 decode_display(&edid->display, &raw->display); 249 250 edid->established_timing = raw->established_timing; 251 252 for (i = 0; i < EDID1_NUM_STD_TIMING; ++i) { 253 decode_std_timing(&edid->std_timing[i], &raw->std_timing[i]); 254 } 255 256 decode_detailed_monitor(edid->detailed_monitor, raw->detailed_monitor, 257 edid->version.version == 1 && edid->version.revision >= 1); 258 } 259