1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * cx18 ADEC VBI functions 4 * 5 * Derived from cx25840-vbi.c 6 * 7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> 8 */ 9 10 11 #include "cx18-driver.h" 12 13 /* 14 * For sliced VBI output, we set up to use VIP-1.1, 8-bit mode, 15 * NN counts 1 byte Dwords, an IDID with the VBI line # in it. 16 * Thus, according to the VIP-2 Spec, our VBI ancillary data lines 17 * (should!) look like: 18 * 4 byte EAV code: 0xff 0x00 0x00 0xRP 19 * unknown number of possible idle bytes 20 * 3 byte Anc data preamble: 0x00 0xff 0xff 21 * 1 byte data identifier: ne010iii (parity bits, 010, DID bits) 22 * 1 byte secondary data id: nessssss (parity bits, SDID bits) 23 * 1 byte data word count: necccccc (parity bits, NN Dword count) 24 * 2 byte Internal DID: VBI-line-# 0x80 25 * NN data bytes 26 * 1 byte checksum 27 * Fill bytes needed to fil out to 4*NN bytes of payload 28 * 29 * The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, & 30 * in the vertical blanking interval are: 31 * 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0) 32 * 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0) 33 * 34 * Since the V bit is only allowed to toggle in the EAV RP code, just 35 * before the first active region line and for active lines, they are: 36 * 0x90 (Task 0 0 HorizontalBlank 0 0 0 0) 37 * 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0) 38 * 39 * The user application DID bytes we care about are: 40 * 0x91 (1 0 010 0 !ActiveLine AncDataPresent) 41 * 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent) 42 * 43 */ 44 static const u8 sliced_vbi_did[2] = { 0x91, 0x55 }; 45 46 struct vbi_anc_data { 47 /* u8 eav[4]; */ 48 /* u8 idle[]; Variable number of idle bytes */ 49 u8 preamble[3]; 50 u8 did; 51 u8 sdid; 52 u8 data_count; 53 u8 idid[2]; 54 u8 payload[1]; /* data_count of payload */ 55 /* u8 checksum; */ 56 /* u8 fill[]; Variable number of fill bytes */ 57 }; 58 59 static int odd_parity(u8 c) 60 { 61 c ^= (c >> 4); 62 c ^= (c >> 2); 63 c ^= (c >> 1); 64 65 return c & 1; 66 } 67 68 static int decode_vps(u8 *dst, u8 *p) 69 { 70 static const u8 biphase_tbl[] = { 71 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 72 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 73 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, 74 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, 75 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, 76 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, 77 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 78 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 79 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, 80 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, 81 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87, 82 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3, 83 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85, 84 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1, 85 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, 86 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, 87 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, 88 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, 89 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86, 90 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2, 91 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84, 92 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0, 93 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, 94 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, 95 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 96 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 97 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, 98 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, 99 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, 100 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, 101 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 102 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 103 }; 104 105 u8 c, err = 0; 106 int i; 107 108 for (i = 0; i < 2 * 13; i += 2) { 109 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]]; 110 c = (biphase_tbl[p[i + 1]] & 0xf) | 111 ((biphase_tbl[p[i]] & 0xf) << 4); 112 dst[i / 2] = c; 113 } 114 115 return err & 0xf0; 116 } 117 118 int cx18_av_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 119 { 120 struct cx18 *cx = v4l2_get_subdevdata(sd); 121 struct cx18_av_state *state = &cx->av_state; 122 static const u16 lcr2vbi[] = { 123 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */ 124 0, V4L2_SLICED_WSS_625, 0, /* 4 */ 125 V4L2_SLICED_CAPTION_525, /* 6 */ 126 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */ 127 0, 0, 0, 0 128 }; 129 int is_pal = !(state->std & V4L2_STD_525_60); 130 int i; 131 132 memset(svbi->service_lines, 0, sizeof(svbi->service_lines)); 133 svbi->service_set = 0; 134 135 /* we're done if raw VBI is active */ 136 if ((cx18_av_read(cx, 0x404) & 0x10) == 0) 137 return 0; 138 139 if (is_pal) { 140 for (i = 7; i <= 23; i++) { 141 u8 v = cx18_av_read(cx, 0x424 + i - 7); 142 143 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 144 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 145 svbi->service_set |= svbi->service_lines[0][i] | 146 svbi->service_lines[1][i]; 147 } 148 } else { 149 for (i = 10; i <= 21; i++) { 150 u8 v = cx18_av_read(cx, 0x424 + i - 10); 151 152 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 153 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 154 svbi->service_set |= svbi->service_lines[0][i] | 155 svbi->service_lines[1][i]; 156 } 157 } 158 return 0; 159 } 160 161 int cx18_av_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt) 162 { 163 struct cx18 *cx = v4l2_get_subdevdata(sd); 164 struct cx18_av_state *state = &cx->av_state; 165 166 /* Setup standard */ 167 cx18_av_std_setup(cx); 168 169 /* VBI Offset */ 170 cx18_av_write(cx, 0x47f, state->slicer_line_delay); 171 cx18_av_write(cx, 0x404, 0x2e); 172 return 0; 173 } 174 175 int cx18_av_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 176 { 177 struct cx18 *cx = v4l2_get_subdevdata(sd); 178 struct cx18_av_state *state = &cx->av_state; 179 int is_pal = !(state->std & V4L2_STD_525_60); 180 int i, x; 181 u8 lcr[24]; 182 183 for (x = 0; x <= 23; x++) 184 lcr[x] = 0x00; 185 186 /* Setup standard */ 187 cx18_av_std_setup(cx); 188 189 /* Sliced VBI */ 190 cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */ 191 cx18_av_write(cx, 0x406, 0x13); 192 cx18_av_write(cx, 0x47f, state->slicer_line_delay); 193 194 /* Force impossible lines to 0 */ 195 if (is_pal) { 196 for (i = 0; i <= 6; i++) 197 svbi->service_lines[0][i] = 198 svbi->service_lines[1][i] = 0; 199 } else { 200 for (i = 0; i <= 9; i++) 201 svbi->service_lines[0][i] = 202 svbi->service_lines[1][i] = 0; 203 204 for (i = 22; i <= 23; i++) 205 svbi->service_lines[0][i] = 206 svbi->service_lines[1][i] = 0; 207 } 208 209 /* Build register values for requested service lines */ 210 for (i = 7; i <= 23; i++) { 211 for (x = 0; x <= 1; x++) { 212 switch (svbi->service_lines[1-x][i]) { 213 case V4L2_SLICED_TELETEXT_B: 214 lcr[i] |= 1 << (4 * x); 215 break; 216 case V4L2_SLICED_WSS_625: 217 lcr[i] |= 4 << (4 * x); 218 break; 219 case V4L2_SLICED_CAPTION_525: 220 lcr[i] |= 6 << (4 * x); 221 break; 222 case V4L2_SLICED_VPS: 223 lcr[i] |= 9 << (4 * x); 224 break; 225 } 226 } 227 } 228 229 if (is_pal) { 230 for (x = 1, i = 0x424; i <= 0x434; i++, x++) 231 cx18_av_write(cx, i, lcr[6 + x]); 232 } else { 233 for (x = 1, i = 0x424; i <= 0x430; i++, x++) 234 cx18_av_write(cx, i, lcr[9 + x]); 235 for (i = 0x431; i <= 0x434; i++) 236 cx18_av_write(cx, i, 0); 237 } 238 239 cx18_av_write(cx, 0x43c, 0x16); 240 /* Should match vblank set in cx18_av_std_setup() */ 241 cx18_av_write(cx, 0x474, is_pal ? 38 : 26); 242 return 0; 243 } 244 245 int cx18_av_decode_vbi_line(struct v4l2_subdev *sd, 246 struct v4l2_decode_vbi_line *vbi) 247 { 248 struct cx18 *cx = v4l2_get_subdevdata(sd); 249 struct cx18_av_state *state = &cx->av_state; 250 struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p; 251 u8 *p; 252 int did, sdid, l, err = 0; 253 254 /* 255 * Check for the ancillary data header for sliced VBI 256 */ 257 if (anc->preamble[0] || 258 anc->preamble[1] != 0xff || anc->preamble[2] != 0xff || 259 (anc->did != sliced_vbi_did[0] && 260 anc->did != sliced_vbi_did[1])) { 261 vbi->line = vbi->type = 0; 262 return 0; 263 } 264 265 did = anc->did; 266 sdid = anc->sdid & 0xf; 267 l = anc->idid[0] & 0x3f; 268 l += state->slicer_line_offset; 269 p = anc->payload; 270 271 /* Decode the SDID set by the slicer */ 272 switch (sdid) { 273 case 1: 274 sdid = V4L2_SLICED_TELETEXT_B; 275 break; 276 case 4: 277 sdid = V4L2_SLICED_WSS_625; 278 break; 279 case 6: 280 sdid = V4L2_SLICED_CAPTION_525; 281 err = !odd_parity(p[0]) || !odd_parity(p[1]); 282 break; 283 case 9: 284 sdid = V4L2_SLICED_VPS; 285 if (decode_vps(p, p) != 0) 286 err = 1; 287 break; 288 default: 289 sdid = 0; 290 err = 1; 291 break; 292 } 293 294 vbi->type = err ? 0 : sdid; 295 vbi->line = err ? 0 : l; 296 vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]); 297 vbi->p = p; 298 return 0; 299 } 300