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 <linux/bitops.h> 12 #include "cx18-driver.h" 13 14 /* 15 * For sliced VBI output, we set up to use VIP-1.1, 8-bit mode, 16 * NN counts 1 byte Dwords, an IDID with the VBI line # in it. 17 * Thus, according to the VIP-2 Spec, our VBI ancillary data lines 18 * (should!) look like: 19 * 4 byte EAV code: 0xff 0x00 0x00 0xRP 20 * unknown number of possible idle bytes 21 * 3 byte Anc data preamble: 0x00 0xff 0xff 22 * 1 byte data identifier: ne010iii (parity bits, 010, DID bits) 23 * 1 byte secondary data id: nessssss (parity bits, SDID bits) 24 * 1 byte data word count: necccccc (parity bits, NN Dword count) 25 * 2 byte Internal DID: VBI-line-# 0x80 26 * NN data bytes 27 * 1 byte checksum 28 * Fill bytes needed to fil out to 4*NN bytes of payload 29 * 30 * The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, & 31 * in the vertical blanking interval are: 32 * 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0) 33 * 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0) 34 * 35 * Since the V bit is only allowed to toggle in the EAV RP code, just 36 * before the first active region line and for active lines, they are: 37 * 0x90 (Task 0 0 HorizontalBlank 0 0 0 0) 38 * 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0) 39 * 40 * The user application DID bytes we care about are: 41 * 0x91 (1 0 010 0 !ActiveLine AncDataPresent) 42 * 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent) 43 * 44 */ 45 static const u8 sliced_vbi_did[2] = { 0x91, 0x55 }; 46 47 struct vbi_anc_data { 48 /* u8 eav[4]; */ 49 /* u8 idle[]; Variable number of idle bytes */ 50 u8 preamble[3]; 51 u8 did; 52 u8 sdid; 53 u8 data_count; 54 u8 idid[2]; 55 u8 payload[]; /* data_count of payload */ 56 /* u8 checksum; */ 57 /* u8 fill[]; Variable number of fill bytes */ 58 }; 59 60 static int decode_vps(u8 *dst, u8 *p) 61 { 62 static const u8 biphase_tbl[] = { 63 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 64 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 65 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, 66 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, 67 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, 68 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, 69 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 70 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 71 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, 72 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, 73 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87, 74 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3, 75 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85, 76 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1, 77 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, 78 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, 79 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, 80 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, 81 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86, 82 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2, 83 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84, 84 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0, 85 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, 86 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, 87 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 88 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 89 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, 90 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, 91 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, 92 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, 93 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 94 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 95 }; 96 97 u8 c, err = 0; 98 int i; 99 100 for (i = 0; i < 2 * 13; i += 2) { 101 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]]; 102 c = (biphase_tbl[p[i + 1]] & 0xf) | 103 ((biphase_tbl[p[i]] & 0xf) << 4); 104 dst[i / 2] = c; 105 } 106 107 return err & 0xf0; 108 } 109 110 int cx18_av_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 111 { 112 struct cx18 *cx = v4l2_get_subdevdata(sd); 113 struct cx18_av_state *state = &cx->av_state; 114 static const u16 lcr2vbi[] = { 115 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */ 116 0, V4L2_SLICED_WSS_625, 0, /* 4 */ 117 V4L2_SLICED_CAPTION_525, /* 6 */ 118 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */ 119 0, 0, 0, 0 120 }; 121 int is_pal = !(state->std & V4L2_STD_525_60); 122 int i; 123 124 memset(svbi->service_lines, 0, sizeof(svbi->service_lines)); 125 svbi->service_set = 0; 126 127 /* we're done if raw VBI is active */ 128 if ((cx18_av_read(cx, 0x404) & 0x10) == 0) 129 return 0; 130 131 if (is_pal) { 132 for (i = 7; i <= 23; i++) { 133 u8 v = cx18_av_read(cx, 0x424 + i - 7); 134 135 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 136 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 137 svbi->service_set |= svbi->service_lines[0][i] | 138 svbi->service_lines[1][i]; 139 } 140 } else { 141 for (i = 10; i <= 21; i++) { 142 u8 v = cx18_av_read(cx, 0x424 + i - 10); 143 144 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 145 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 146 svbi->service_set |= svbi->service_lines[0][i] | 147 svbi->service_lines[1][i]; 148 } 149 } 150 return 0; 151 } 152 153 int cx18_av_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt) 154 { 155 struct cx18 *cx = v4l2_get_subdevdata(sd); 156 struct cx18_av_state *state = &cx->av_state; 157 158 /* Setup standard */ 159 cx18_av_std_setup(cx); 160 161 /* VBI Offset */ 162 cx18_av_write(cx, 0x47f, state->slicer_line_delay); 163 cx18_av_write(cx, 0x404, 0x2e); 164 return 0; 165 } 166 167 int cx18_av_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 168 { 169 struct cx18 *cx = v4l2_get_subdevdata(sd); 170 struct cx18_av_state *state = &cx->av_state; 171 int is_pal = !(state->std & V4L2_STD_525_60); 172 int i, x; 173 u8 lcr[24]; 174 175 for (x = 0; x <= 23; x++) 176 lcr[x] = 0x00; 177 178 /* Setup standard */ 179 cx18_av_std_setup(cx); 180 181 /* Sliced VBI */ 182 cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */ 183 cx18_av_write(cx, 0x406, 0x13); 184 cx18_av_write(cx, 0x47f, state->slicer_line_delay); 185 186 /* Force impossible lines to 0 */ 187 if (is_pal) { 188 for (i = 0; i <= 6; i++) 189 svbi->service_lines[0][i] = 190 svbi->service_lines[1][i] = 0; 191 } else { 192 for (i = 0; i <= 9; i++) 193 svbi->service_lines[0][i] = 194 svbi->service_lines[1][i] = 0; 195 196 for (i = 22; i <= 23; i++) 197 svbi->service_lines[0][i] = 198 svbi->service_lines[1][i] = 0; 199 } 200 201 /* Build register values for requested service lines */ 202 for (i = 7; i <= 23; i++) { 203 for (x = 0; x <= 1; x++) { 204 switch (svbi->service_lines[1-x][i]) { 205 case V4L2_SLICED_TELETEXT_B: 206 lcr[i] |= 1 << (4 * x); 207 break; 208 case V4L2_SLICED_WSS_625: 209 lcr[i] |= 4 << (4 * x); 210 break; 211 case V4L2_SLICED_CAPTION_525: 212 lcr[i] |= 6 << (4 * x); 213 break; 214 case V4L2_SLICED_VPS: 215 lcr[i] |= 9 << (4 * x); 216 break; 217 } 218 } 219 } 220 221 if (is_pal) { 222 for (x = 1, i = 0x424; i <= 0x434; i++, x++) 223 cx18_av_write(cx, i, lcr[6 + x]); 224 } else { 225 for (x = 1, i = 0x424; i <= 0x430; i++, x++) 226 cx18_av_write(cx, i, lcr[9 + x]); 227 for (i = 0x431; i <= 0x434; i++) 228 cx18_av_write(cx, i, 0); 229 } 230 231 cx18_av_write(cx, 0x43c, 0x16); 232 /* Should match vblank set in cx18_av_std_setup() */ 233 cx18_av_write(cx, 0x474, is_pal ? 38 : 26); 234 return 0; 235 } 236 237 int cx18_av_decode_vbi_line(struct v4l2_subdev *sd, 238 struct v4l2_decode_vbi_line *vbi) 239 { 240 struct cx18 *cx = v4l2_get_subdevdata(sd); 241 struct cx18_av_state *state = &cx->av_state; 242 struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p; 243 u8 *p; 244 int did, sdid, l, err = 0; 245 246 /* 247 * Check for the ancillary data header for sliced VBI 248 */ 249 if (anc->preamble[0] || 250 anc->preamble[1] != 0xff || anc->preamble[2] != 0xff || 251 (anc->did != sliced_vbi_did[0] && 252 anc->did != sliced_vbi_did[1])) { 253 vbi->line = vbi->type = 0; 254 return 0; 255 } 256 257 did = anc->did; 258 sdid = anc->sdid & 0xf; 259 l = anc->idid[0] & 0x3f; 260 l += state->slicer_line_offset; 261 p = anc->payload; 262 263 /* Decode the SDID set by the slicer */ 264 switch (sdid) { 265 case 1: 266 sdid = V4L2_SLICED_TELETEXT_B; 267 break; 268 case 4: 269 sdid = V4L2_SLICED_WSS_625; 270 break; 271 case 6: 272 sdid = V4L2_SLICED_CAPTION_525; 273 err = !parity8(p[0]) || !parity8(p[1]); 274 break; 275 case 9: 276 sdid = V4L2_SLICED_VPS; 277 if (decode_vps(p, p) != 0) 278 err = 1; 279 break; 280 default: 281 sdid = 0; 282 err = 1; 283 break; 284 } 285 286 vbi->type = err ? 0 : sdid; 287 vbi->line = err ? 0 : l; 288 vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]); 289 vbi->p = p; 290 return 0; 291 } 292