drivers/media/video/cx25840/cx25840-vbi.c

   1 /* cx25840 VBI functions
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License
   5  * as published by the Free Software Foundation; either version 2
   6  * of the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  */
  17
  18
  19 #include <linux/videodev2.h>
  20 #include <linux/i2c.h>
  21 #include <media/v4l2-common.h>
  22 #include <media/cx25840.h>
  23
  24 #include "cx25840-core.h"
  25
  26 static int odd_parity(u8 c)
  27 {
  28         c ^= (c >> 4);
  29         c ^= (c >> 2);
  30         c ^= (c >> 1);
  31
  32         return c & 1;
  33 }
  34
  35 static int decode_vps(u8 * dst, u8 * p)
  36 {
  37         static const u8 biphase_tbl[] = {
  38                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  39                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  40                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  41                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  42                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  43                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  44                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  45                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  46                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  47                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  48                 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
  49                 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
  50                 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
  51                 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
  52                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  53                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  54                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  55                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  56                 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
  57                 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
  58                 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
  59                 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
  60                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  61                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  62                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  63                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  64                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  65                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  66                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  67                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  68                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  69                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  70         };
  71
  72         u8 c, err = 0;
  73         int i;
  74
  75         for (i = 0; i < 2 * 13; i += 2) {
  76                 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
  77                 c = (biphase_tbl[p[i + 1]] & 0xf) |
  78                     ((biphase_tbl[p[i]] & 0xf) << 4);
  79                 dst[i / 2] = c;
  80         }
  81
  82         return err & 0xf0;
  83 }
  84
  85 void cx25840_vbi_setup(struct i2c_client *client)
  86 {
  87         struct cx25840_state *state = i2c_get_clientdata(client);
  88         v4l2_std_id std = cx25840_get_v4lstd(client);
  89         int hblank,hactive,burst,vblank,vactive,sc,vblank656,src_decimation;
  90         int luma_lpf,uv_lpf, comb;
  91         u32 pll_int,pll_frac,pll_post;
  92
  93         /* datasheet startup, step 8d */
  94         if (std & ~V4L2_STD_NTSC) {
  95                 cx25840_write(client, 0x49f, 0x11);
  96         } else {
  97                 cx25840_write(client, 0x49f, 0x14);
  98         }
  99
 100         if (std & V4L2_STD_625_50) {
 101                 hblank=0x084;
 102                 hactive=0x2d0;
 103                 burst=0x5d;
 104                 vblank=0x024;
 105                 vactive=0x244;
 106                 vblank656=0x28;
 107                 src_decimation=0x21f;
 108
 109                 luma_lpf=2;
 110                 if (std & V4L2_STD_SECAM) {
 111                         uv_lpf=0;
 112                         comb=0;
 113                         sc=0x0a425f;
 114                 } else if (std == V4L2_STD_PAL_Nc) {
 115                         uv_lpf=1;
 116                         comb=0x20;
 117                         sc=556453;
 118                 } else {
 119                         uv_lpf=1;
 120                         comb=0x20;
 121                         sc=0x0a8263;
 122                 }
 123         } else {
 124                 hactive=720;
 125                 hblank=122;
 126                 vactive=487;
 127                 luma_lpf=1;
 128                 uv_lpf=1;
 129
 130                 src_decimation=0x21f;
 131                 if (std == V4L2_STD_PAL_60) {
 132                         vblank=26;
 133                         vblank656=26;
 134                         burst=0x5b;
 135                         luma_lpf=2;
 136                         comb=0x20;
 137                         sc=0x0a8263;
 138                 } else if (std == V4L2_STD_PAL_M) {
 139                         vblank=20;
 140                         vblank656=24;
 141                         burst=0x61;
 142                         comb=0x20;
 143
 144                         sc=555452;
 145                 } else {
 146                         vblank=26;
 147                         vblank656=26;
 148                         burst=0x5b;
 149                         comb=0x66;
 150                         sc=556063;
 151                 }
 152         }
 153
 154         /* DEBUG: Displays configured PLL frequency */
 155         pll_int=cx25840_read(client, 0x108);
 156         pll_frac=cx25840_read4(client, 0x10c)&0x1ffffff;
 157         pll_post=cx25840_read(client, 0x109);
 158         v4l_dbg(1, cx25840_debug, client,
 159                                 "PLL regs = int: %u, frac: %u, post: %u\n",
 160                                 pll_int,pll_frac,pll_post);
 161
 162         if (pll_post) {
 163                 int fin, fsc;
 164                 int pll= (28636363L*((((u64)pll_int)<<25L)+pll_frac)) >>25L;
 165
 166                 pll/=pll_post;
 167                 v4l_dbg(1, cx25840_debug, client, "PLL = %d.%06d MHz\n",
 168                                                 pll/1000000, pll%1000000);
 169                 v4l_dbg(1, cx25840_debug, client, "PLL/8 = %d.%06d MHz\n",
 170                                                 pll/8000000, (pll/8)%1000000);
 171
 172                 fin=((u64)src_decimation*pll)>>12;
 173                 v4l_dbg(1, cx25840_debug, client, "ADC Sampling freq = "
 174                                                 "%d.%06d MHz\n",
 175                                                 fin/1000000,fin%1000000);
 176
 177                 fsc= (((u64)sc)*pll) >> 24L;
 178                 v4l_dbg(1, cx25840_debug, client, "Chroma sub-carrier freq = "
 179                                                 "%d.%06d MHz\n",
 180                                                 fsc/1000000,fsc%1000000);
 181
 182                 v4l_dbg(1, cx25840_debug, client, "hblank %i, hactive %i, "
 183                         "vblank %i , vactive %i, vblank656 %i, src_dec %i,"
 184                         "burst 0x%02x, luma_lpf %i, uv_lpf %i, comb 0x%02x,"
 185                         " sc 0x%06x\n",
 186                         hblank, hactive, vblank, vactive, vblank656,
 187                         src_decimation, burst, luma_lpf, uv_lpf, comb, sc);
 188         }
 189
 190         /* Sets horizontal blanking delay and active lines */
 191         cx25840_write(client, 0x470, hblank);
 192         cx25840_write(client, 0x471, 0xff&(((hblank>>8)&0x3)|(hactive <<4)));
 193         cx25840_write(client, 0x472, hactive>>4);
 194
 195         /* Sets burst gate delay */
 196         cx25840_write(client, 0x473, burst);
 197
 198         /* Sets vertical blanking delay and active duration */
 199         cx25840_write(client, 0x474, vblank);
 200         cx25840_write(client, 0x475, 0xff&(((vblank>>8)&0x3)|(vactive <<4)));
 201         cx25840_write(client, 0x476, vactive>>4);
 202         cx25840_write(client, 0x477, vblank656);
 203
 204         /* Sets src decimation rate */
 205         cx25840_write(client, 0x478, 0xff&src_decimation);
 206         cx25840_write(client, 0x479, 0xff&(src_decimation>>8));
 207
 208         /* Sets Luma and UV Low pass filters */
 209         cx25840_write(client, 0x47a, luma_lpf<<6|((uv_lpf<<4)&0x30));
 210
 211         /* Enables comb filters */
 212         cx25840_write(client, 0x47b, comb);
 213
 214         /* Sets SC Step*/
 215         cx25840_write(client, 0x47c, sc);
 216         cx25840_write(client, 0x47d, 0xff&sc>>8);
 217         cx25840_write(client, 0x47e, 0xff&sc>>16);
 218
 219         /* Sets VBI parameters */
 220         if (std & V4L2_STD_625_50) {
 221                 cx25840_write(client, 0x47f, 0x01);
 222                 state->vbi_line_offset = 5;
 223         } else {
 224                 cx25840_write(client, 0x47f, 0x00);
 225                 state->vbi_line_offset = 8;
 226         }
 227 }
 228
 229 int cx25840_vbi(struct i2c_client *client, unsigned int cmd, void *arg)
 230 {
 231         struct cx25840_state *state = i2c_get_clientdata(client);
 232         struct v4l2_format *fmt;
 233         struct v4l2_sliced_vbi_format *svbi;
 234
 235         switch (cmd) {
 236         case VIDIOC_G_FMT:
 237         {
 238                 static u16 lcr2vbi[] = {
 239                         0, V4L2_SLICED_TELETEXT_B, 0,   /* 1 */
 240                         0, V4L2_SLICED_WSS_625, 0,      /* 4 */
 241                         V4L2_SLICED_CAPTION_525,        /* 6 */
 242                         0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
 243                         0, 0, 0, 0
 244                 };
 245                 int is_pal = !(cx25840_get_v4lstd(client) & V4L2_STD_525_60);
 246                 int i;
 247
 248                 fmt = arg;
 249                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 250                         return -EINVAL;
 251                 svbi = &fmt->fmt.sliced;
 252                 memset(svbi, 0, sizeof(*svbi));
 253                 /* we're done if raw VBI is active */
 254                 if ((cx25840_read(client, 0x404) & 0x10) == 0)
 255                         break;
 256
 257                 if (is_pal) {
 258                         for (i = 7; i <= 23; i++) {
 259                                 u8 v = cx25840_read(client, 0x424 + i - 7);
 260
 261                                 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 262                                 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 263                                 svbi->service_set |=
 264                                         svbi->service_lines[0][i] | svbi->service_lines[1][i];
 265                         }
 266                 }
 267                 else {
 268                         for (i = 10; i <= 21; i++) {
 269                                 u8 v = cx25840_read(client, 0x424 + i - 10);
 270
 271                                 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 272                                 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 273                                 svbi->service_set |=
 274                                         svbi->service_lines[0][i] | svbi->service_lines[1][i];
 275                         }
 276                 }
 277                 break;
 278         }
 279
 280         case VIDIOC_S_FMT:
 281         {
 282                 int is_pal = !(cx25840_get_v4lstd(client) & V4L2_STD_525_60);
 283                 int vbi_offset = is_pal ? 1 : 0;
 284                 int i, x;
 285                 u8 lcr[24];
 286
 287                 fmt = arg;
 288                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 289                         return -EINVAL;
 290                 svbi = &fmt->fmt.sliced;
 291                 if (svbi->service_set == 0) {
 292                         /* raw VBI */
 293                         memset(svbi, 0, sizeof(*svbi));
 294
 295                         /* Setup VBI */
 296                         cx25840_vbi_setup(client);
 297
 298                         /* VBI Offset */
 299                         cx25840_write(client, 0x47f, vbi_offset);
 300                         cx25840_write(client, 0x404, 0x2e);
 301                         break;
 302                 }
 303
 304                 for (x = 0; x <= 23; x++)
 305                         lcr[x] = 0x00;
 306
 307                 /* Setup VBI */
 308                 cx25840_vbi_setup(client);
 309
 310                 /* Sliced VBI */
 311                 cx25840_write(client, 0x404, 0x32);     /* Ancillary data */
 312                 cx25840_write(client, 0x406, 0x13);
 313                 cx25840_write(client, 0x47f, vbi_offset);
 314
 315                 if (is_pal) {
 316                         for (i = 0; i <= 6; i++)
 317                                 svbi->service_lines[0][i] =
 318                                         svbi->service_lines[1][i] = 0;
 319                 } else {
 320                         for (i = 0; i <= 9; i++)
 321                                 svbi->service_lines[0][i] =
 322                                         svbi->service_lines[1][i] = 0;
 323
 324                         for (i = 22; i <= 23; i++)
 325                                 svbi->service_lines[0][i] =
 326                                         svbi->service_lines[1][i] = 0;
 327                 }
 328
 329                 for (i = 7; i <= 23; i++) {
 330                         for (x = 0; x <= 1; x++) {
 331                                 switch (svbi->service_lines[1-x][i]) {
 332                                 case V4L2_SLICED_TELETEXT_B:
 333                                         lcr[i] |= 1 << (4 * x);
 334                                         break;
 335                                 case V4L2_SLICED_WSS_625:
 336                                         lcr[i] |= 4 << (4 * x);
 337                                         break;
 338                                 case V4L2_SLICED_CAPTION_525:
 339                                         lcr[i] |= 6 << (4 * x);
 340                                         break;
 341                                 case V4L2_SLICED_VPS:
 342                                         lcr[i] |= 9 << (4 * x);
 343                                         break;
 344                                 }
 345                         }
 346                 }
 347
 348                 if (is_pal) {
 349                         for (x = 1, i = 0x424; i <= 0x434; i++, x++) {
 350                                 cx25840_write(client, i, lcr[6 + x]);
 351                         }
 352                 }
 353                 else {
 354                         for (x = 1, i = 0x424; i <= 0x430; i++, x++) {
 355                                 cx25840_write(client, i, lcr[9 + x]);
 356                         }
 357                         for (i = 0x431; i <= 0x434; i++) {
 358                                 cx25840_write(client, i, 0);
 359                         }
 360                 }
 361
 362                 cx25840_write(client, 0x43c, 0x16);
 363
 364                 if (is_pal) {
 365                         cx25840_write(client, 0x474, 0x2a);
 366                 } else {
 367                         cx25840_write(client, 0x474, 0x22);
 368                 }
 369                 break;
 370         }
 371
 372         case VIDIOC_INT_DECODE_VBI_LINE:
 373         {
 374                 struct v4l2_decode_vbi_line *vbi = arg;
 375                 u8 *p = vbi->p;
 376                 int id1, id2, l, err = 0;
 377
 378                 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 379                     (p[3] != 0x55 && p[3] != 0x91)) {
 380                         vbi->line = vbi->type = 0;
 381                         break;
 382                 }
 383
 384                 p += 4;
 385                 id1 = p[-1];
 386                 id2 = p[0] & 0xf;
 387                 l = p[2] & 0x3f;
 388                 l += state->vbi_line_offset;
 389                 p += 4;
 390
 391                 switch (id2) {
 392                 case 1:
 393                         id2 = V4L2_SLICED_TELETEXT_B;
 394                         break;
 395                 case 4:
 396                         id2 = V4L2_SLICED_WSS_625;
 397                         break;
 398                 case 6:
 399                         id2 = V4L2_SLICED_CAPTION_525;
 400                         err = !odd_parity(p[0]) || !odd_parity(p[1]);
 401                         break;
 402                 case 9:
 403                         id2 = V4L2_SLICED_VPS;
 404                         if (decode_vps(p, p) != 0) {
 405                                 err = 1;
 406                         }
 407                         break;
 408                 default:
 409                         id2 = 0;
 410                         err = 1;
 411                         break;
 412                 }
 413
 414                 vbi->type = err ? 0 : id2;
 415                 vbi->line = err ? 0 : l;
 416                 vbi->is_second_field = err ? 0 : (id1 == 0x55);
 417                 vbi->p = p;
 418                 break;
 419         }
 420         }
 421
 422         return 0;
 423 }