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
  23 #include "cx25840.h"
  24
  25 static int odd_parity(u8 c)
  26 {
  27         c ^= (c >> 4);
  28         c ^= (c >> 2);
  29         c ^= (c >> 1);
  30
  31         return c & 1;
  32 }
  33
  34 static int decode_vps(u8 * dst, u8 * p)
  35 {
  36         static const u8 biphase_tbl[] = {
  37                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  38                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  39                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  40                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  41                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  42                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  43                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  44                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  45                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  46                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  47                 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
  48                 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
  49                 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
  50                 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
  51                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  52                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  53                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  54                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  55                 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
  56                 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
  57                 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
  58                 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
  59                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  60                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  61                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  62                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  63                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  64                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  65                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  66                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  67                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  68                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  69         };
  70
  71         u8 c, err = 0;
  72         int i;
  73
  74         for (i = 0; i < 2 * 13; i += 2) {
  75                 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
  76                 c = (biphase_tbl[p[i + 1]] & 0xf) |
  77                     ((biphase_tbl[p[i]] & 0xf) << 4);
  78                 dst[i / 2] = c;
  79         }
  80
  81         return err & 0xf0;
  82 }
  83
  84 void cx25840_vbi_setup(struct i2c_client *client)
  85 {
  86         v4l2_std_id std = cx25840_get_v4lstd(client);
  87
  88         if (std & ~V4L2_STD_NTSC) {
  89                 /* datasheet startup, step 8d */
  90                 cx25840_write(client, 0x49f, 0x11);
  91
  92                 cx25840_write(client, 0x470, 0x84);
  93                 cx25840_write(client, 0x471, 0x00);
  94                 cx25840_write(client, 0x472, 0x2d);
  95                 cx25840_write(client, 0x473, 0x5d);
  96
  97                 cx25840_write(client, 0x474, 0x24);
  98                 cx25840_write(client, 0x475, 0x40);
  99                 cx25840_write(client, 0x476, 0x24);
 100                 cx25840_write(client, 0x477, 0x28);
 101
 102                 cx25840_write(client, 0x478, 0x1f);
 103                 cx25840_write(client, 0x479, 0x02);
 104
 105                 if (std & V4L2_STD_SECAM) {
 106                         cx25840_write(client, 0x47a, 0x80);
 107                         cx25840_write(client, 0x47b, 0x00);
 108                         cx25840_write(client, 0x47c, 0x5f);
 109                         cx25840_write(client, 0x47d, 0x42);
 110                 } else {
 111                         cx25840_write(client, 0x47a, 0x90);
 112                         cx25840_write(client, 0x47b, 0x20);
 113                         cx25840_write(client, 0x47c, 0x63);
 114                         cx25840_write(client, 0x47d, 0x82);
 115                 }
 116
 117                 cx25840_write(client, 0x47e, 0x0a);
 118                 cx25840_write(client, 0x47f, 0x01);
 119         } else {
 120                 /* datasheet startup, step 8d */
 121                 cx25840_write(client, 0x49f, 0x14);
 122
 123                 cx25840_write(client, 0x470, 0x7a);
 124                 cx25840_write(client, 0x471, 0x00);
 125                 cx25840_write(client, 0x472, 0x2d);
 126                 cx25840_write(client, 0x473, 0x5b);
 127
 128                 cx25840_write(client, 0x474, 0x1a);
 129                 cx25840_write(client, 0x475, 0x70);
 130                 cx25840_write(client, 0x476, 0x1e);
 131                 cx25840_write(client, 0x477, 0x1e);
 132
 133                 cx25840_write(client, 0x478, 0x1f);
 134                 cx25840_write(client, 0x479, 0x02);
 135                 cx25840_write(client, 0x47a, 0x50);
 136                 cx25840_write(client, 0x47b, 0x66);
 137
 138                 cx25840_write(client, 0x47c, 0x1f);
 139                 cx25840_write(client, 0x47d, 0x7c);
 140                 cx25840_write(client, 0x47e, 0x08);
 141                 cx25840_write(client, 0x47f, 0x00);
 142         }
 143 }
 144
 145 int cx25840_vbi(struct i2c_client *client, unsigned int cmd, void *arg)
 146 {
 147         struct v4l2_format *fmt;
 148         struct v4l2_sliced_vbi_format *svbi;
 149
 150         switch (cmd) {
 151         case VIDIOC_G_FMT:
 152         {
 153                 static u16 lcr2vbi[] = {
 154                         0, V4L2_SLICED_TELETEXT_PAL_B, 0,       /* 1 */
 155                         0, V4L2_SLICED_WSS_625, 0,      /* 4 */
 156                         V4L2_SLICED_CAPTION_525,        /* 6 */
 157                         0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
 158                         0, 0, 0, 0
 159                 };
 160                 int i;
 161
 162                 fmt = arg;
 163                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 164                         return -EINVAL;
 165                 svbi = &fmt->fmt.sliced;
 166                 memset(svbi, 0, sizeof(*svbi));
 167                 /* we're done if raw VBI is active */
 168                 if ((cx25840_read(client, 0x404) & 0x10) == 0)
 169                         break;
 170
 171                 for (i = 7; i <= 23; i++) {
 172                         u8 v = cx25840_read(client, 0x424 + i - 7);
 173
 174                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 175                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 176                         svbi->service_set |=
 177                                  svbi->service_lines[0][i] | svbi->service_lines[1][i];
 178                 }
 179                 break;
 180         }
 181
 182         case VIDIOC_S_FMT:
 183         {
 184                 int is_pal = !(cx25840_get_v4lstd(client) & V4L2_STD_NTSC);
 185                 int vbi_offset = is_pal ? 1 : 0;
 186                 int i, x;
 187                 u8 lcr[24];
 188
 189                 fmt = arg;
 190                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 191                         return -EINVAL;
 192                 svbi = &fmt->fmt.sliced;
 193                 if (svbi->service_set == 0) {
 194                         /* raw VBI */
 195                         memset(svbi, 0, sizeof(*svbi));
 196
 197                         /* Setup VBI */
 198                         cx25840_vbi_setup(client);
 199
 200                         /* VBI Offset */
 201                         cx25840_write(client, 0x47f, vbi_offset);
 202                         cx25840_write(client, 0x404, 0x2e);
 203                         break;
 204                 }
 205
 206                 for (x = 0; x <= 23; x++)
 207                         lcr[x] = 0x00;
 208
 209                 /* Setup VBI */
 210                 cx25840_vbi_setup(client);
 211
 212                 /* Sliced VBI */
 213                 cx25840_write(client, 0x404, 0x36);     /* Ancillery data */
 214                 cx25840_write(client, 0x406, 0x13);
 215                 cx25840_write(client, 0x47f, vbi_offset);
 216
 217                 if (is_pal) {
 218                         for (i = 0; i <= 6; i++)
 219                                 svbi->service_lines[0][i] =
 220                                         svbi->service_lines[1][i] = 0;
 221                 } else {
 222                         for (i = 0; i <= 9; i++)
 223                                 svbi->service_lines[0][i] =
 224                                         svbi->service_lines[1][i] = 0;
 225
 226                         for (i = 22; i <= 23; i++)
 227                                 svbi->service_lines[0][i] =
 228                                         svbi->service_lines[1][i] = 0;
 229                 }
 230
 231                 for (i = 7; i <= 23; i++) {
 232                         for (x = 0; x <= 1; x++) {
 233                                 switch (svbi->service_lines[1-x][i]) {
 234                                 case V4L2_SLICED_TELETEXT_PAL_B:
 235                                         lcr[i] |= 1 << (4 * x);
 236                                         break;
 237                                 case V4L2_SLICED_WSS_625:
 238                                         lcr[i] |= 4 << (4 * x);
 239                                         break;
 240                                 case V4L2_SLICED_CAPTION_525:
 241                                         lcr[i] |= 6 << (4 * x);
 242                                         break;
 243                                 case V4L2_SLICED_VPS:
 244                                         lcr[i] |= 9 << (4 * x);
 245                                         break;
 246                                 }
 247                         }
 248                 }
 249
 250                 for (x = 1, i = 0x424; i <= 0x434; i++, x++) {
 251                         cx25840_write(client, i, lcr[6 + x]);
 252                 }
 253
 254                 cx25840_write(client, 0x43c, 0x16);
 255
 256                 if (is_pal) {
 257                         cx25840_write(client, 0x474, 0x2a);
 258                 } else {
 259                         cx25840_write(client, 0x474, 0x1a + 6);
 260                 }
 261                 break;
 262         }
 263
 264         case VIDIOC_INT_DECODE_VBI_LINE:
 265         {
 266                 struct v4l2_decode_vbi_line *vbi = arg;
 267                 u8 *p = vbi->p;
 268                 int id1, id2, l, err = 0;
 269
 270                 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 271                     (p[3] != 0x55 && p[3] != 0x91)) {
 272                         vbi->line = vbi->type = 0;
 273                         break;
 274                 }
 275
 276                 p += 4;
 277                 id1 = p[-1];
 278                 id2 = p[0] & 0xf;
 279                 l = p[2] & 0x3f;
 280                 l += 5;
 281                 p += 4;
 282
 283                 switch (id2) {
 284                 case 1:
 285                         id2 = V4L2_SLICED_TELETEXT_PAL_B;
 286                         break;
 287                 case 4:
 288                         id2 = V4L2_SLICED_WSS_625;
 289                         break;
 290                 case 6:
 291                         id2 = V4L2_SLICED_CAPTION_525;
 292                         err = !odd_parity(p[0]) || !odd_parity(p[1]);
 293                         break;
 294                 case 9:
 295                         id2 = V4L2_SLICED_VPS;
 296                         if (decode_vps(p, p) != 0) {
 297                                 err = 1;
 298                         }
 299                         break;
 300                 default:
 301                         id2 = 0;
 302                         err = 1;
 303                         break;
 304                 }
 305
 306                 vbi->type = err ? 0 : id2;
 307                 vbi->line = err ? 0 : l;
 308                 vbi->is_second_field = err ? 0 : (id1 == 0x55);
 309                 vbi->p = p;
 310                 break;
 311         }
 312         }
 313
 314         return 0;
 315 }