drivers/media/video/cx18/cx18-av-vbi.c

   1 /*
   2  *  cx18 ADEC VBI functions
   3  *
   4  *  Derived from cx25840-vbi.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU General Public License
  10  *  as published by the Free Software Foundation; either version 2
  11  *  of the License, or (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  *  02110-1301, USA.
  22  */
  23
  24
  25 #include "cx18-driver.h"
  26
  27 static int odd_parity(u8 c)
  28 {
  29         c ^= (c >> 4);
  30         c ^= (c >> 2);
  31         c ^= (c >> 1);
  32
  33         return c & 1;
  34 }
  35
  36 static int decode_vps(u8 *dst, u8 *p)
  37 {
  38         static const u8 biphase_tbl[] = {
  39                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  40                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  41                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  42                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  43                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  44                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  45                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  46                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  47                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  48                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  49                 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
  50                 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
  51                 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
  52                 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
  53                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  54                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  55                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  56                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  57                 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
  58                 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
  59                 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
  60                 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
  61                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  62                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  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         };
  72
  73         u8 c, err = 0;
  74         int i;
  75
  76         for (i = 0; i < 2 * 13; i += 2) {
  77                 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
  78                 c = (biphase_tbl[p[i + 1]] & 0xf) |
  79                     ((biphase_tbl[p[i]] & 0xf) << 4);
  80                 dst[i / 2] = c;
  81         }
  82
  83         return err & 0xf0;
  84 }
  85
  86 int cx18_av_vbi(struct cx18 *cx, unsigned int cmd, void *arg)
  87 {
  88         struct cx18_av_state *state = &cx->av_state;
  89         struct v4l2_format *fmt;
  90         struct v4l2_sliced_vbi_format *svbi;
  91
  92         switch (cmd) {
  93         case VIDIOC_G_FMT:
  94         {
  95                 static u16 lcr2vbi[] = {
  96                         0, V4L2_SLICED_TELETEXT_B, 0,   /* 1 */
  97                         0, V4L2_SLICED_WSS_625, 0,      /* 4 */
  98                         V4L2_SLICED_CAPTION_525,        /* 6 */
  99                         0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
 100                         0, 0, 0, 0
 101                 };
 102                 int is_pal = !(state->std & V4L2_STD_525_60);
 103                 int i;
 104
 105                 fmt = arg;
 106                 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 107                         return -EINVAL;
 108                 svbi = &fmt->fmt.sliced;
 109                 memset(svbi, 0, sizeof(*svbi));
 110                 /* we're done if raw VBI is active */
 111                 if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
 112                         break;
 113
 114                 if (is_pal) {
 115                         for (i = 7; i <= 23; i++) {
 116                                 u8 v = cx18_av_read(cx, 0x424 + i - 7);
 117
 118                                 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 119                                 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 120                                 svbi->service_set |= svbi->service_lines[0][i] |
 121                                         svbi->service_lines[1][i];
 122                         }
 123                 } else {
 124                         for (i = 10; i <= 21; i++) {
 125                                 u8 v = cx18_av_read(cx, 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 |= svbi->service_lines[0][i] |
 130                                         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                         cx18_av_std_setup(cx);
 153
 154                         /* VBI Offset */
 155                         cx18_av_write(cx, 0x47f, vbi_offset);
 156                         cx18_av_write(cx, 0x404, 0x2e);
 157                         break;
 158                 }
 159
 160                 for (x = 0; x <= 23; x++)
 161                         lcr[x] = 0x00;
 162
 163                 /* Setup standard */
 164                 cx18_av_std_setup(cx);
 165
 166                 /* Sliced VBI */
 167                 cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */
 168                 cx18_av_write(cx, 0x406, 0x13);
 169                 cx18_av_write(cx, 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                                 cx18_av_write(cx, i, lcr[6 + x]);
 207                 } else {
 208                         for (x = 1, i = 0x424; i <= 0x430; i++, x++)
 209                                 cx18_av_write(cx, i, lcr[9 + x]);
 210                         for (i = 0x431; i <= 0x434; i++)
 211                                 cx18_av_write(cx, i, 0);
 212                 }
 213
 214                 cx18_av_write(cx, 0x43c, 0x16);
 215                 cx18_av_write(cx, 0x474, is_pal ? 0x2a : 0x22);
 216                 break;
 217         }
 218
 219         case VIDIOC_INT_DECODE_VBI_LINE:
 220         {
 221                 struct v4l2_decode_vbi_line *vbi = arg;
 222                 u8 *p = vbi->p;
 223                 int id1, id2, l, err = 0;
 224
 225                 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 226                     (p[3] != 0x55 && p[3] != 0x91)) {
 227                         vbi->line = vbi->type = 0;
 228                         break;
 229                 }
 230
 231                 p += 4;
 232                 id1 = p[-1];
 233                 id2 = p[0] & 0xf;
 234                 l = p[2] & 0x3f;
 235                 l += state->vbi_line_offset;
 236                 p += 4;
 237
 238                 switch (id2) {
 239                 case 1:
 240                         id2 = V4L2_SLICED_TELETEXT_B;
 241                         break;
 242                 case 4:
 243                         id2 = V4L2_SLICED_WSS_625;
 244                         break;
 245                 case 6:
 246                         id2 = V4L2_SLICED_CAPTION_525;
 247                         err = !odd_parity(p[0]) || !odd_parity(p[1]);
 248                         break;
 249                 case 9:
 250                         id2 = V4L2_SLICED_VPS;
 251                         if (decode_vps(p, p) != 0)
 252                                 err = 1;
 253                         break;
 254                 default:
 255                         id2 = 0;
 256                         err = 1;
 257                         break;
 258                 }
 259
 260                 vbi->type = err ? 0 : id2;
 261                 vbi->line = err ? 0 : l;
 262                 vbi->is_second_field = err ? 0 : (id1 == 0x55);
 263                 vbi->p = p;
 264                 break;
 265         }
 266         }
 267
 268         return 0;
 269 }