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 int cx25840_vbi(struct i2c_client *client, unsigned int cmd, void *arg)
  86 {
  87         struct cx25840_state *state = i2c_get_clientdata(client);
  88         struct v4l2_format *fmt;
  89         struct v4l2_sliced_vbi_format *svbi;
  90
  91         switch (cmd) {
  92         case VIDIOC_G_FMT:
  93         {
  94                 static u16 lcr2vbi[] = {
  95                         0, V4L2_SLICED_TELETEXT_B, 0,   /* 1 */
  96                         0, V4L2_SLICED_WSS_625, 0,      /* 4 */
  97                         V4L2_SLICED_CAPTION_525,        /* 6 */
  98                         0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
  99                         0, 0, 0, 0
 100                 };
 101                 int is_pal = !(state->std & V4L2_STD_525_60);
 102                 int i;
 103
 104                 fmt = arg;
 105                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 106                         return -EINVAL;
 107                 svbi = &fmt->fmt.sliced;
 108                 memset(svbi, 0, sizeof(*svbi));
 109                 /* we're done if raw VBI is active */
 110                 if ((cx25840_read(client, 0x404) & 0x10) == 0)
 111                         break;
 112
 113                 if (is_pal) {
 114                         for (i = 7; i <= 23; i++) {
 115                                 u8 v = cx25840_read(client, 0x424 + i - 7);
 116
 117                                 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 118                                 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 119                                 svbi->service_set |=
 120                                         svbi->service_lines[0][i] | svbi->service_lines[1][i];
 121                         }
 122                 }
 123                 else {
 124                         for (i = 10; i <= 21; i++) {
 125                                 u8 v = cx25840_read(client, 0x424 + i - 10);
 126
 127                                 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 128                                 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 129                                 svbi->service_set |=
 130                                         svbi->service_lines[0][i] | svbi->service_lines[1][i];
 131                         }
 132                 }
 133                 break;
 134         }
 135
 136         case VIDIOC_S_FMT:
 137         {
 138                 int is_pal = !(state->std & V4L2_STD_525_60);
 139                 int vbi_offset = is_pal ? 1 : 0;
 140                 int i, x;
 141                 u8 lcr[24];
 142
 143                 fmt = arg;
 144                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 145                         return -EINVAL;
 146                 svbi = &fmt->fmt.sliced;
 147                 if (svbi->service_set == 0) {
 148                         /* raw VBI */
 149                         memset(svbi, 0, sizeof(*svbi));
 150
 151                         /* Setup standard */
 152                         cx25840_std_setup(client);
 153
 154                         /* VBI Offset */
 155                         cx25840_write(client, 0x47f, vbi_offset);
 156                         cx25840_write(client, 0x404, 0x2e);
 157                         break;
 158                 }
 159
 160                 for (x = 0; x <= 23; x++)
 161                         lcr[x] = 0x00;
 162
 163                 /* Setup standard */
 164                 cx25840_std_setup(client);
 165
 166                 /* Sliced VBI */
 167                 cx25840_write(client, 0x404, 0x32);     /* Ancillary data */
 168                 cx25840_write(client, 0x406, 0x13);
 169                 cx25840_write(client, 0x47f, vbi_offset);
 170
 171                 if (is_pal) {
 172                         for (i = 0; i <= 6; i++)
 173                                 svbi->service_lines[0][i] =
 174                                         svbi->service_lines[1][i] = 0;
 175                 } else {
 176                         for (i = 0; i <= 9; i++)
 177                                 svbi->service_lines[0][i] =
 178                                         svbi->service_lines[1][i] = 0;
 179
 180                         for (i = 22; i <= 23; i++)
 181                                 svbi->service_lines[0][i] =
 182                                         svbi->service_lines[1][i] = 0;
 183                 }
 184
 185                 for (i = 7; i <= 23; i++) {
 186                         for (x = 0; x <= 1; x++) {
 187                                 switch (svbi->service_lines[1-x][i]) {
 188                                 case V4L2_SLICED_TELETEXT_B:
 189                                         lcr[i] |= 1 << (4 * x);
 190                                         break;
 191                                 case V4L2_SLICED_WSS_625:
 192                                         lcr[i] |= 4 << (4 * x);
 193                                         break;
 194                                 case V4L2_SLICED_CAPTION_525:
 195                                         lcr[i] |= 6 << (4 * x);
 196                                         break;
 197                                 case V4L2_SLICED_VPS:
 198                                         lcr[i] |= 9 << (4 * x);
 199                                         break;
 200                                 }
 201                         }
 202                 }
 203
 204                 if (is_pal) {
 205                         for (x = 1, i = 0x424; i <= 0x434; i++, x++) {
 206                                 cx25840_write(client, i, lcr[6 + x]);
 207                         }
 208                 }
 209                 else {
 210                         for (x = 1, i = 0x424; i <= 0x430; i++, x++) {
 211                                 cx25840_write(client, i, lcr[9 + x]);
 212                         }
 213                         for (i = 0x431; i <= 0x434; i++) {
 214                                 cx25840_write(client, i, 0);
 215                         }
 216                 }
 217
 218                 cx25840_write(client, 0x43c, 0x16);
 219
 220                 if (is_pal) {
 221                         cx25840_write(client, 0x474, 0x2a);
 222                 } else {
 223                         cx25840_write(client, 0x474, 0x22);
 224                 }
 225                 break;
 226         }
 227
 228         case VIDIOC_INT_DECODE_VBI_LINE:
 229         {
 230                 struct v4l2_decode_vbi_line *vbi = arg;
 231                 u8 *p = vbi->p;
 232                 int id1, id2, l, err = 0;
 233
 234                 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 235                     (p[3] != 0x55 && p[3] != 0x91)) {
 236                         vbi->line = vbi->type = 0;
 237                         break;
 238                 }
 239
 240                 p += 4;
 241                 id1 = p[-1];
 242                 id2 = p[0] & 0xf;
 243                 l = p[2] & 0x3f;
 244                 l += state->vbi_line_offset;
 245                 p += 4;
 246
 247                 switch (id2) {
 248                 case 1:
 249                         id2 = V4L2_SLICED_TELETEXT_B;
 250                         break;
 251                 case 4:
 252                         id2 = V4L2_SLICED_WSS_625;
 253                         break;
 254                 case 6:
 255                         id2 = V4L2_SLICED_CAPTION_525;
 256                         err = !odd_parity(p[0]) || !odd_parity(p[1]);
 257                         break;
 258                 case 9:
 259                         id2 = V4L2_SLICED_VPS;
 260                         if (decode_vps(p, p) != 0) {
 261                                 err = 1;
 262                         }
 263                         break;
 264                 default:
 265                         id2 = 0;
 266                         err = 1;
 267                         break;
 268                 }
 269
 270                 vbi->type = err ? 0 : id2;
 271                 vbi->line = err ? 0 : l;
 272                 vbi->is_second_field = err ? 0 : (id1 == 0x55);
 273                 vbi->p = p;
 274                 break;
 275         }
 276         }
 277
 278         return 0;
 279 }