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_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
  86 {
  87         struct i2c_client *client = v4l2_get_subdevdata(sd);
  88         struct cx25840_state *state = to_state(sd);
  89         struct v4l2_sliced_vbi_format *svbi;
  90         static const u16 lcr2vbi[] = {
  91                 0, V4L2_SLICED_TELETEXT_B, 0,   /* 1 */
  92                 0, V4L2_SLICED_WSS_625, 0,      /* 4 */
  93                 V4L2_SLICED_CAPTION_525,        /* 6 */
  94                 0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
  95                 0, 0, 0, 0
  96         };
  97         int is_pal = !(state->std & V4L2_STD_525_60);
  98         int i;
  99
 100         if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 101                 return -EINVAL;
 102         svbi = &fmt->fmt.sliced;
 103         memset(svbi, 0, sizeof(*svbi));
 104         /* we're done if raw VBI is active */
 105         if ((cx25840_read(client, 0x404) & 0x10) == 0)
 106                 return 0;
 107
 108         if (is_pal) {
 109                 for (i = 7; i <= 23; i++) {
 110                         u8 v = cx25840_read(client, 0x424 + i - 7);
 111
 112                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 113                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 114                         svbi->service_set |= svbi->service_lines[0][i] |
 115                                              svbi->service_lines[1][i];
 116                 }
 117         } else {
 118                 for (i = 10; i <= 21; i++) {
 119                         u8 v = cx25840_read(client, 0x424 + i - 10);
 120
 121                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 122                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 123                         svbi->service_set |= svbi->service_lines[0][i] |
 124                                              svbi->service_lines[1][i];
 125                 }
 126         }
 127         return 0;
 128 }
 129
 130 int cx25840_vbi_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
 131 {
 132         struct i2c_client *client = v4l2_get_subdevdata(sd);
 133         struct cx25840_state *state = to_state(sd);
 134         struct v4l2_sliced_vbi_format *svbi;
 135         int is_pal = !(state->std & V4L2_STD_525_60);
 136         int vbi_offset = is_pal ? 1 : 0;
 137         int i, x;
 138         u8 lcr[24];
 139
 140         if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE &&
 141                         fmt->type != V4L2_BUF_TYPE_VBI_CAPTURE)
 142                 return -EINVAL;
 143         svbi = &fmt->fmt.sliced;
 144         if (fmt->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 145                 /* raw VBI */
 146                 memset(svbi, 0, sizeof(*svbi));
 147
 148                 /* Setup standard */
 149                 cx25840_std_setup(client);
 150
 151                 /* VBI Offset */
 152                 cx25840_write(client, 0x47f, vbi_offset);
 153                 cx25840_write(client, 0x404, 0x2e);
 154                 return 0;
 155         }
 156
 157         for (x = 0; x <= 23; x++)
 158                 lcr[x] = 0x00;
 159
 160         /* Setup standard */
 161         cx25840_std_setup(client);
 162
 163         /* Sliced VBI */
 164         cx25840_write(client, 0x404, 0x32);     /* Ancillary data */
 165         cx25840_write(client, 0x406, 0x13);
 166         cx25840_write(client, 0x47f, vbi_offset);
 167
 168         if (is_pal) {
 169                 for (i = 0; i <= 6; i++)
 170                         svbi->service_lines[0][i] =
 171                                 svbi->service_lines[1][i] = 0;
 172         } else {
 173                 for (i = 0; i <= 9; i++)
 174                         svbi->service_lines[0][i] =
 175                                 svbi->service_lines[1][i] = 0;
 176
 177                 for (i = 22; i <= 23; i++)
 178                         svbi->service_lines[0][i] =
 179                                 svbi->service_lines[1][i] = 0;
 180         }
 181
 182         for (i = 7; i <= 23; i++) {
 183                 for (x = 0; x <= 1; x++) {
 184                         switch (svbi->service_lines[1-x][i]) {
 185                         case V4L2_SLICED_TELETEXT_B:
 186                                 lcr[i] |= 1 << (4 * x);
 187                                 break;
 188                         case V4L2_SLICED_WSS_625:
 189                                 lcr[i] |= 4 << (4 * x);
 190                                 break;
 191                         case V4L2_SLICED_CAPTION_525:
 192                                 lcr[i] |= 6 << (4 * x);
 193                                 break;
 194                         case V4L2_SLICED_VPS:
 195                                 lcr[i] |= 9 << (4 * x);
 196                                 break;
 197                         }
 198                 }
 199         }
 200
 201         if (is_pal) {
 202                 for (x = 1, i = 0x424; i <= 0x434; i++, x++)
 203                         cx25840_write(client, i, lcr[6 + x]);
 204         } else {
 205                 for (x = 1, i = 0x424; i <= 0x430; i++, x++)
 206                         cx25840_write(client, i, lcr[9 + x]);
 207                 for (i = 0x431; i <= 0x434; i++)
 208                         cx25840_write(client, i, 0);
 209         }
 210
 211         cx25840_write(client, 0x43c, 0x16);
 212         cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
 213         return 0;
 214 }
 215
 216 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
 217 {
 218         struct cx25840_state *state = to_state(sd);
 219         u8 *p = vbi->p;
 220         int id1, id2, l, err = 0;
 221
 222         if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 223                         (p[3] != 0x55 && p[3] != 0x91)) {
 224                 vbi->line = vbi->type = 0;
 225                 return 0;
 226         }
 227
 228         p += 4;
 229         id1 = p[-1];
 230         id2 = p[0] & 0xf;
 231         l = p[2] & 0x3f;
 232         l += state->vbi_line_offset;
 233         p += 4;
 234
 235         switch (id2) {
 236         case 1:
 237                 id2 = V4L2_SLICED_TELETEXT_B;
 238                 break;
 239         case 4:
 240                 id2 = V4L2_SLICED_WSS_625;
 241                 break;
 242         case 6:
 243                 id2 = V4L2_SLICED_CAPTION_525;
 244                 err = !odd_parity(p[0]) || !odd_parity(p[1]);
 245                 break;
 246         case 9:
 247                 id2 = V4L2_SLICED_VPS;
 248                 if (decode_vps(p, p) != 0)
 249                         err = 1;
 250                 break;
 251         default:
 252                 id2 = 0;
 253                 err = 1;
 254                 break;
 255         }
 256
 257         vbi->type = err ? 0 : id2;
 258         vbi->line = err ? 0 : l;
 259         vbi->is_second_field = err ? 0 : (id1 == 0x55);
 260         vbi->p = p;
 261         return 0;
 262 }