drivers/media/i2c/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
  14
  15 #include <linux/videodev2.h>
  16 #include <linux/i2c.h>
  17 #include <media/v4l2-common.h>
  18 #include <media/drv-intf/cx25840.h>
  19
  20 #include "cx25840-core.h"
  21
  22 static int odd_parity(u8 c)
  23 {
  24         c ^= (c >> 4);
  25         c ^= (c >> 2);
  26         c ^= (c >> 1);
  27
  28         return c & 1;
  29 }
  30
  31 static int decode_vps(u8 * dst, u8 * p)
  32 {
  33         static const u8 biphase_tbl[] = {
  34                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  35                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  36                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  37                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  38                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  39                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  40                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  41                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  42                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  43                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  44                 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
  45                 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
  46                 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
  47                 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
  48                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  49                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  50                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  51                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  52                 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
  53                 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
  54                 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
  55                 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
  56                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  57                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  58                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  59                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  60                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  61                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  62                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  63                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  64                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  65                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  66         };
  67
  68         u8 c, err = 0;
  69         int i;
  70
  71         for (i = 0; i < 2 * 13; i += 2) {
  72                 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
  73                 c = (biphase_tbl[p[i + 1]] & 0xf) |
  74                     ((biphase_tbl[p[i]] & 0xf) << 4);
  75                 dst[i / 2] = c;
  76         }
  77
  78         return err & 0xf0;
  79 }
  80
  81 int cx25840_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
  82 {
  83         struct i2c_client *client = v4l2_get_subdevdata(sd);
  84         struct cx25840_state *state = to_state(sd);
  85         static const u16 lcr2vbi[] = {
  86                 0, V4L2_SLICED_TELETEXT_B, 0,   /* 1 */
  87                 0, V4L2_SLICED_WSS_625, 0,      /* 4 */
  88                 V4L2_SLICED_CAPTION_525,        /* 6 */
  89                 0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
  90                 0, 0, 0, 0
  91         };
  92         int is_pal = !(state->std & V4L2_STD_525_60);
  93         int i;
  94
  95         memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
  96         svbi->service_set = 0;
  97         /* we're done if raw VBI is active */
  98         if ((cx25840_read(client, 0x404) & 0x10) == 0)
  99                 return 0;
 100
 101         if (is_pal) {
 102                 for (i = 7; i <= 23; i++) {
 103                         u8 v = cx25840_read(client,
 104                                  state->vbi_regs_offset + 0x424 + i - 7);
 105
 106                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 107                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 108                         svbi->service_set |= svbi->service_lines[0][i] |
 109                                              svbi->service_lines[1][i];
 110                 }
 111         } else {
 112                 for (i = 10; i <= 21; i++) {
 113                         u8 v = cx25840_read(client,
 114                                 state->vbi_regs_offset + 0x424 + i - 10);
 115
 116                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 117                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 118                         svbi->service_set |= svbi->service_lines[0][i] |
 119                                              svbi->service_lines[1][i];
 120                 }
 121         }
 122         return 0;
 123 }
 124
 125 int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
 126 {
 127         struct i2c_client *client = v4l2_get_subdevdata(sd);
 128         struct cx25840_state *state = to_state(sd);
 129         int is_pal = !(state->std & V4L2_STD_525_60);
 130         int vbi_offset = is_pal ? 1 : 0;
 131
 132         /* Setup standard */
 133         cx25840_std_setup(client);
 134
 135         /* VBI Offset */
 136         if (is_cx23888(state))
 137                 cx25840_write(client, 0x54f, vbi_offset);
 138         else
 139                 cx25840_write(client, 0x47f, vbi_offset);
 140         cx25840_write(client, 0x404, 0x2e);
 141         return 0;
 142 }
 143
 144 int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
 145 {
 146         struct i2c_client *client = v4l2_get_subdevdata(sd);
 147         struct cx25840_state *state = to_state(sd);
 148         int is_pal = !(state->std & V4L2_STD_525_60);
 149         int vbi_offset = is_pal ? 1 : 0;
 150         int i, x;
 151         u8 lcr[24];
 152
 153         for (x = 0; x <= 23; x++)
 154                 lcr[x] = 0x00;
 155
 156         /* Setup standard */
 157         cx25840_std_setup(client);
 158
 159         /* Sliced VBI */
 160         cx25840_write(client, 0x404, 0x32);     /* Ancillary data */
 161         cx25840_write(client, 0x406, 0x13);
 162         if (is_cx23888(state))
 163                 cx25840_write(client, 0x54f, vbi_offset);
 164         else
 165                 cx25840_write(client, 0x47f, vbi_offset);
 166
 167         if (is_pal) {
 168                 for (i = 0; i <= 6; i++)
 169                         svbi->service_lines[0][i] =
 170                                 svbi->service_lines[1][i] = 0;
 171         } else {
 172                 for (i = 0; i <= 9; i++)
 173                         svbi->service_lines[0][i] =
 174                                 svbi->service_lines[1][i] = 0;
 175
 176                 for (i = 22; i <= 23; i++)
 177                         svbi->service_lines[0][i] =
 178                                 svbi->service_lines[1][i] = 0;
 179         }
 180
 181         for (i = 7; i <= 23; i++) {
 182                 for (x = 0; x <= 1; x++) {
 183                         switch (svbi->service_lines[1-x][i]) {
 184                         case V4L2_SLICED_TELETEXT_B:
 185                                 lcr[i] |= 1 << (4 * x);
 186                                 break;
 187                         case V4L2_SLICED_WSS_625:
 188                                 lcr[i] |= 4 << (4 * x);
 189                                 break;
 190                         case V4L2_SLICED_CAPTION_525:
 191                                 lcr[i] |= 6 << (4 * x);
 192                                 break;
 193                         case V4L2_SLICED_VPS:
 194                                 lcr[i] |= 9 << (4 * x);
 195                                 break;
 196                         }
 197                 }
 198         }
 199
 200         if (is_pal) {
 201                 for (x = 1, i = state->vbi_regs_offset + 0x424;
 202                      i <= state->vbi_regs_offset + 0x434; i++, x++)
 203                         cx25840_write(client, i, lcr[6 + x]);
 204         } else {
 205                 for (x = 1, i = state->vbi_regs_offset + 0x424;
 206                      i <= state->vbi_regs_offset + 0x430; i++, x++)
 207                         cx25840_write(client, i, lcr[9 + x]);
 208                 for (i = state->vbi_regs_offset + 0x431;
 209                      i <= state->vbi_regs_offset + 0x434; i++)
 210                         cx25840_write(client, i, 0);
 211         }
 212
 213         cx25840_write(client, state->vbi_regs_offset + 0x43c, 0x16);
 214         if (is_cx23888(state))
 215                 cx25840_write(client, 0x428, is_pal ? 0x2a : 0x22);
 216         else
 217                 cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
 218         return 0;
 219 }
 220
 221 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
 222 {
 223         struct cx25840_state *state = to_state(sd);
 224         u8 *p = vbi->p;
 225         int id1, id2, l, err = 0;
 226
 227         if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 228                         (p[3] != 0x55 && p[3] != 0x91)) {
 229                 vbi->line = vbi->type = 0;
 230                 return 0;
 231         }
 232
 233         p += 4;
 234         id1 = p[-1];
 235         id2 = p[0] & 0xf;
 236         l = p[2] & 0x3f;
 237         l += state->vbi_line_offset;
 238         p += 4;
 239
 240         switch (id2) {
 241         case 1:
 242                 id2 = V4L2_SLICED_TELETEXT_B;
 243                 break;
 244         case 4:
 245                 id2 = V4L2_SLICED_WSS_625;
 246                 break;
 247         case 6:
 248                 id2 = V4L2_SLICED_CAPTION_525;
 249                 err = !odd_parity(p[0]) || !odd_parity(p[1]);
 250                 break;
 251         case 9:
 252                 id2 = V4L2_SLICED_VPS;
 253                 if (decode_vps(p, p) != 0)
 254                         err = 1;
 255                 break;
 256         default:
 257                 id2 = 0;
 258                 err = 1;
 259                 break;
 260         }
 261
 262         vbi->type = err ? 0 : id2;
 263         vbi->line = err ? 0 : l;
 264         vbi->is_second_field = err ? 0 : (id1 == 0x55);
 265         vbi->p = p;
 266         return 0;
 267 }