/* * Copyright 2007 Red Hat, Inc. * * 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 * on the rights to use, copy, modify, merge, publish, distribute, sub * license, 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 (including the next * paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS 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. */ /* Author: Soren Sandmann */ #include "config.h" #include #include #include #include #include "backends/edid.h" /* VESA E-EDID */ #define EDID_BLOCK_LENGTH 128 #define EDID_EXT_FLAG_ADDR 0x7E #define EDID_EXT_TAG_ADDR 0x00 /* VESA reserved IDs for extension blocks */ #define EDID_EXT_ID_CTA 0x02 /* CTA-861 extension block */ #define EDID_EXT_CTA_REVISION_ADDR 0x01 #define EDID_EXT_CTA_DESCRIPTOR_OFFSET_ADDR 0x02 #define EDID_EXT_CTA_DATA_BLOCK_OFFSET 0x04 #define EDID_EXT_CTA_TAG_EXTENDED 0x07 static int get_bit (int in, int bit) { return (in & (1 << bit)) >> bit; } static int get_bits (int in, int begin, int end) { int mask = (1 << (end - begin + 1)) - 1; return (in >> begin) & mask; } static void decode_check_sum (const uint8_t *edid, MetaEdidInfo *info) { int i; uint8_t check = 0; for (i = 0; i < 128; ++i) check += edid[i]; info->checksum = check; } static gboolean decode_header (const uint8_t *edid) { if (memcmp (edid, "\x00\xff\xff\xff\xff\xff\xff\x00", 8) == 0) return TRUE; return FALSE; } static gboolean decode_vendor_and_product_identification (const uint8_t *edid, MetaEdidInfo *info) { int is_model_year; /* Manufacturer Code */ info->manufacturer_code[0] = get_bits (edid[0x08], 2, 6); info->manufacturer_code[1] = get_bits (edid[0x08], 0, 1) << 3; info->manufacturer_code[1] |= get_bits (edid[0x09], 5, 7); info->manufacturer_code[2] = get_bits (edid[0x09], 0, 4); info->manufacturer_code[3] = '\0'; info->manufacturer_code[0] += 'A' - 1; info->manufacturer_code[1] += 'A' - 1; info->manufacturer_code[2] += 'A' - 1; /* Product Code */ info->product_code = edid[0x0b] << 8 | edid[0x0a]; /* Serial Number */ info->serial_number = edid[0x0c] | edid[0x0d] << 8 | edid[0x0e] << 16 | edid[0x0f] << 24; /* Week and Year */ is_model_year = FALSE; switch (edid[0x10]) { case 0x00: info->production_week = -1; break; case 0xff: info->production_week = -1; is_model_year = TRUE; break; default: info->production_week = edid[0x10]; break; } if (is_model_year) { info->production_year = -1; info->model_year = 1990 + edid[0x11]; } else { info->production_year = 1990 + edid[0x11]; info->model_year = -1; } return TRUE; } static gboolean decode_edid_version (const uint8_t *edid, MetaEdidInfo *info) { info->major_version = edid[0x12]; info->minor_version = edid[0x13]; return TRUE; } static gboolean decode_display_parameters (const uint8_t *edid, MetaEdidInfo *info) { /* Digital vs Analog */ info->is_digital = get_bit (edid[0x14], 7); if (info->is_digital) { int bits; static const int bit_depth[8] = { -1, 6, 8, 10, 12, 14, 16, -1 }; static const MetaEdidInterface interfaces[6] = { META_EDID_INTERFACE_UNDEFINED, META_EDID_INTERFACE_DVI, META_EDID_INTERFACE_HDMI_A, META_EDID_INTERFACE_HDMI_B, META_EDID_INTERFACE_MDDI, META_EDID_INTERFACE_DISPLAY_PORT }; bits = get_bits (edid[0x14], 4, 6); info->connector.digital.bits_per_primary = bit_depth[bits]; bits = get_bits (edid[0x14], 0, 3); if (bits <= 5) info->connector.digital.interface = interfaces[bits]; else info->connector.digital.interface = META_EDID_INTERFACE_UNDEFINED; } else { int bits = get_bits (edid[0x14], 5, 6); static const double levels[][3] = { { 0.7, 0.3, 1.0 }, { 0.714, 0.286, 1.0 }, { 1.0, 0.4, 1.4 }, { 0.7, 0.0, 0.7 }, }; info->connector.analog.video_signal_level = levels[bits][0]; info->connector.analog.sync_signal_level = levels[bits][1]; info->connector.analog.total_signal_level = levels[bits][2]; info->connector.analog.blank_to_black = get_bit (edid[0x14], 4); info->connector.analog.separate_hv_sync = get_bit (edid[0x14], 3); info->connector.analog.composite_sync_on_h = get_bit (edid[0x14], 2); info->connector.analog.composite_sync_on_green = get_bit (edid[0x14], 1); info->connector.analog.serration_on_vsync = get_bit (edid[0x14], 0); } /* Screen Size / Aspect Ratio */ if (edid[0x15] == 0 && edid[0x16] == 0) { info->width_mm = -1; info->height_mm = -1; info->aspect_ratio = -1.0; } else if (edid[0x16] == 0) { info->width_mm = -1; info->height_mm = -1; info->aspect_ratio = 100.0 / (edid[0x15] + 99); } else if (edid[0x15] == 0) { info->width_mm = -1; info->height_mm = -1; info->aspect_ratio = 100.0 / (edid[0x16] + 99); info->aspect_ratio = 1/info->aspect_ratio; /* portrait */ } else { info->width_mm = 10 * edid[0x15]; info->height_mm = 10 * edid[0x16]; } /* Gamma */ if (edid[0x17] == 0xFF) info->gamma = -1.0; else info->gamma = (edid[0x17] + 100.0) / 100.0; /* Features */ info->standby = get_bit (edid[0x18], 7); info->suspend = get_bit (edid[0x18], 6); info->active_off = get_bit (edid[0x18], 5); if (info->is_digital) { info->connector.digital.rgb444 = TRUE; if (get_bit (edid[0x18], 3)) info->connector.digital.ycrcb444 = 1; if (get_bit (edid[0x18], 4)) info->connector.digital.ycrcb422 = 1; } else { int bits = get_bits (edid[0x18], 3, 4); MetaEdidColorType color_type[4] = { META_EDID_COLOR_TYPE_MONOCHROME, META_EDID_COLOR_TYPE_RGB, META_EDID_COLOR_TYPE_OTHER_COLOR, META_EDID_COLOR_TYPE_UNDEFINED }; info->connector.analog.color_type = color_type[bits]; } info->srgb_is_standard = get_bit (edid[0x18], 2); /* In 1.3 this is called "has preferred timing" */ info->preferred_timing_includes_native = get_bit (edid[0x18], 1); /* FIXME: In 1.3 this indicates whether the monitor accepts GTF */ info->continuous_frequency = get_bit (edid[0x18], 0); return TRUE; } static double decode_fraction (int high, int low) { double result = 0.0; int i; high = (high << 2) | low; for (i = 0; i < 10; ++i) result += get_bit (high, i) * pow (2, i - 10); return result; } static gboolean decode_color_characteristics (const uint8_t *edid, MetaEdidInfo *info) { info->red_x = decode_fraction (edid[0x1b], get_bits (edid[0x19], 6, 7)); info->red_y = decode_fraction (edid[0x1c], get_bits (edid[0x19], 5, 4)); info->green_x = decode_fraction (edid[0x1d], get_bits (edid[0x19], 2, 3)); info->green_y = decode_fraction (edid[0x1e], get_bits (edid[0x19], 0, 1)); info->blue_x = decode_fraction (edid[0x1f], get_bits (edid[0x1a], 6, 7)); info->blue_y = decode_fraction (edid[0x20], get_bits (edid[0x1a], 4, 5)); info->white_x = decode_fraction (edid[0x21], get_bits (edid[0x1a], 2, 3)); info->white_y = decode_fraction (edid[0x22], get_bits (edid[0x1a], 0, 1)); return TRUE; } static int decode_established_timings (const uint8_t *edid, MetaEdidInfo *info) { static const MetaEdidTiming established[][8] = { { { 800, 600, 60 }, { 800, 600, 56 }, { 640, 480, 75 }, { 640, 480, 72 }, { 640, 480, 67 }, { 640, 480, 60 }, { 720, 400, 88 }, { 720, 400, 70 } }, { { 1280, 1024, 75 }, { 1024, 768, 75 }, { 1024, 768, 70 }, { 1024, 768, 60 }, { 1024, 768, 87 }, { 832, 624, 75 }, { 800, 600, 75 }, { 800, 600, 72 } }, { { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 1152, 870, 75 } }, }; int i, j, idx; idx = 0; for (i = 0; i < 3; ++i) { for (j = 0; j < 8; ++j) { int byte = edid[0x23 + i]; if (get_bit (byte, j) && established[i][j].frequency != 0) info->established[idx++] = established[i][j]; } } return TRUE; } static gboolean decode_standard_timings (const uint8_t *edid, MetaEdidInfo *info) { int i; for (i = 0; i < 8; i++) { int first = edid[0x26 + 2 * i]; int second = edid[0x27 + 2 * i]; if (first != 0x01 && second != 0x01) { int w = 8 * (first + 31); int h = 0; switch (get_bits (second, 6, 7)) { case 0x00: h = (w / 16) * 10; break; case 0x01: h = (w / 4) * 3; break; case 0x02: h = (w / 5) * 4; break; case 0x03: h = (w / 16) * 9; break; } info->standard[i].width = w; info->standard[i].height = h; info->standard[i].frequency = get_bits (second, 0, 5) + 60; } } return TRUE; } static void decode_lf_string (const uint8_t *s, int n_chars, char *result) { int i; for (i = 0; i < n_chars; ++i) { if (s[i] == 0x0a) { *result++ = '\0'; break; } else if (s[i] == 0x00) { /* Convert embedded 0's to spaces */ *result++ = ' '; } else { *result++ = s[i]; } } } static void decode_display_descriptor (const uint8_t *desc, MetaEdidInfo *info) { switch (desc[0x03]) { case 0xFC: decode_lf_string (desc + 5, 13, info->dsc_product_name); break; case 0xFF: decode_lf_string (desc + 5, 13, info->dsc_serial_number); break; case 0xFE: decode_lf_string (desc + 5, 13, info->dsc_string); break; case 0xFD: /* Range Limits */ break; case 0xFB: /* Color Point */ break; case 0xFA: /* Timing Identifications */ break; case 0xF9: /* Color Management */ break; case 0xF8: /* Timing Codes */ break; case 0xF7: /* Established Timings */ break; case 0x10: break; } } static void decode_detailed_timing (const uint8_t *timing, MetaEdidDetailedTiming *detailed) { int bits; MetaEdidStereoType stereo[] = { META_EDID_STEREO_TYPE_NO_STEREO, META_EDID_STEREO_TYPE_NO_STEREO, META_EDID_STEREO_TYPE_FIELD_RIGHT, META_EDID_STEREO_TYPE_FIELD_LEFT, META_EDID_STEREO_TYPE_TWO_WAY_RIGHT_ON_EVEN, META_EDID_STEREO_TYPE_TWO_WAY_LEFT_ON_EVEN, META_EDID_STEREO_TYPE_FOUR_WAY_INTERLEAVED, META_EDID_STEREO_TYPE_SIDE_BY_SIDE }; detailed->pixel_clock = (timing[0x00] | timing[0x01] << 8) * 10000; detailed->h_addr = timing[0x02] | ((timing[0x04] & 0xf0) << 4); detailed->h_blank = timing[0x03] | ((timing[0x04] & 0x0f) << 8); detailed->v_addr = timing[0x05] | ((timing[0x07] & 0xf0) << 4); detailed->v_blank = timing[0x06] | ((timing[0x07] & 0x0f) << 8); detailed->h_front_porch = timing[0x08] | get_bits (timing[0x0b], 6, 7) << 8; detailed->h_sync = timing[0x09] | get_bits (timing[0x0b], 4, 5) << 8; detailed->v_front_porch = get_bits (timing[0x0a], 4, 7) | get_bits (timing[0x0b], 2, 3) << 4; detailed->v_sync = get_bits (timing[0x0a], 0, 3) | get_bits (timing[0x0b], 0, 1) << 4; detailed->width_mm = timing[0x0c] | get_bits (timing[0x0e], 4, 7) << 8; detailed->height_mm = timing[0x0d] | get_bits (timing[0x0e], 0, 3) << 8; detailed->right_border = timing[0x0f]; detailed->top_border = timing[0x10]; detailed->interlaced = get_bit (timing[0x11], 7); /* Stereo */ bits = get_bits (timing[0x11], 5, 6) << 1 | get_bit (timing[0x11], 0); detailed->stereo = stereo[bits]; /* Sync */ bits = timing[0x11]; detailed->digital_sync = get_bit (bits, 4); if (detailed->digital_sync) { detailed->connector.digital.composite = !get_bit (bits, 3); if (detailed->connector.digital.composite) { detailed->connector.digital.serrations = get_bit (bits, 2); detailed->connector.digital.negative_vsync = FALSE; } else { detailed->connector.digital.serrations = FALSE; detailed->connector.digital.negative_vsync = !get_bit (bits, 2); } detailed->connector.digital.negative_hsync = !get_bit (bits, 0); } else { detailed->connector.analog.bipolar = get_bit (bits, 3); detailed->connector.analog.serrations = get_bit (bits, 2); detailed->connector.analog.sync_on_green = !get_bit (bits, 1); } } static gboolean decode_descriptors (const uint8_t *edid, MetaEdidInfo *info) { int i; int timing_idx; timing_idx = 0; for (i = 0; i < 4; ++i) { int index = 0x36 + i * 18; if (edid[index + 0] == 0x00 && edid[index + 1] == 0x00) { decode_display_descriptor (edid + index, info); } else { decode_detailed_timing (edid + index, &(info->detailed_timings[timing_idx++])); } } info->n_detailed_timings = timing_idx; return TRUE; } static gboolean decode_ext_cta (const uint8_t *cta_block, MetaEdidInfo *info) { const uint8_t *data_block; uint8_t data_block_end; uint8_t data_block_offset; int size; int tag; /* The CTA extension block is a number of data blocks followed by a number * of (timing) descriptors. We only parse the data blocks. */ /* CTA-861-H Table 58: CTA Extension Version 3 */ data_block_end = cta_block[EDID_EXT_CTA_DESCRIPTOR_OFFSET_ADDR]; data_block_offset = EDID_EXT_CTA_DATA_BLOCK_OFFSET; /* Table 58: * If d=0, then no detailed timing descriptors are provided, and no data is * provided in the data block collection */ if (data_block_end == 0) return TRUE; /* Table 58: * If no data is provided in the data block collection, then d=4 */ if (data_block_end == 4) return TRUE; if (data_block_end < 4) return FALSE; while (data_block_offset < data_block_end) { /* CTA-861-H 7.4: CTA Data Block Collection */ data_block = cta_block + data_block_offset; size = get_bits (data_block[0], 0, 4) + 1; tag = get_bits (data_block[0], 5, 7); data_block_offset += size; /* CTA Data Block extended tag type is the second byte */ if (tag == EDID_EXT_CTA_TAG_EXTENDED) tag = (tag << 8) + data_block[1]; switch (tag) { } } return TRUE; } static gboolean decode_extensions (const uint8_t *edid, MetaEdidInfo *info) { int blocks; int i; const uint8_t *block = NULL; blocks = edid[EDID_EXT_FLAG_ADDR]; for (i = 0; i < blocks; i++) { block = edid + EDID_BLOCK_LENGTH * (i + 1); switch (block[EDID_EXT_TAG_ADDR]) { case EDID_EXT_ID_CTA: if (!decode_ext_cta (block, info)) return FALSE; break; } } return TRUE; } MetaEdidInfo * meta_edid_info_new_parse (const uint8_t *edid) { MetaEdidInfo *info; info = g_new0 (MetaEdidInfo, 1); decode_check_sum (edid, info); if (decode_header (edid) && decode_vendor_and_product_identification (edid, info) && decode_edid_version (edid, info) && decode_display_parameters (edid, info) && decode_color_characteristics (edid, info) && decode_established_timings (edid, info) && decode_standard_timings (edid, info) && decode_descriptors (edid, info) && decode_extensions (edid, info)) { return info; } else { g_free (info); return NULL; } }