drivers/media/i2c/cx25840/cx25840-vbi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* cx25840 VBI functions
   3  */
   4
   5
   6 #include <linux/videodev2.h>
   7 #include <linux/i2c.h>
   8 #include <media/v4l2-common.h>
   9 #include <media/drv-intf/cx25840.h>
  10
  11 #include "cx25840-core.h"
  12
  13 static int odd_parity(u8 c)
  14 {
  15         c ^= (c >> 4);
  16         c ^= (c >> 2);
  17         c ^= (c >> 1);
  18
  19         return c & 1;
  20 }
  21
  22 static int decode_vps(u8 * dst, u8 * p)
  23 {
  24         static const u8 biphase_tbl[] = {
  25                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  26                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  27                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  28                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  29                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  30                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  31                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  32                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  33                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  34                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  35                 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
  36                 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
  37                 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
  38                 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
  39                 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
  40                 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
  41                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  42                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  43                 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
  44                 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
  45                 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
  46                 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
  47                 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
  48                 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
  49                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  50                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  51                 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
  52                 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
  53                 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
  54                 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
  55                 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
  56                 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
  57         };
  58
  59         u8 c, err = 0;
  60         int i;
  61
  62         for (i = 0; i < 2 * 13; i += 2) {
  63                 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
  64                 c = (biphase_tbl[p[i + 1]] & 0xf) |
  65                     ((biphase_tbl[p[i]] & 0xf) << 4);
  66                 dst[i / 2] = c;
  67         }
  68
  69         return err & 0xf0;
  70 }
  71
  72 int cx25840_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
  73 {
  74         struct i2c_client *client = v4l2_get_subdevdata(sd);
  75         struct cx25840_state *state = to_state(sd);
  76         static const u16 lcr2vbi[] = {
  77                 0, V4L2_SLICED_TELETEXT_B, 0,   /* 1 */
  78                 0, V4L2_SLICED_WSS_625, 0,      /* 4 */
  79                 V4L2_SLICED_CAPTION_525,        /* 6 */
  80                 0, 0, V4L2_SLICED_VPS, 0, 0,    /* 9 */
  81                 0, 0, 0, 0
  82         };
  83         int is_pal = !(state->std & V4L2_STD_525_60);
  84         int i;
  85
  86         memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
  87         svbi->service_set = 0;
  88         /* we're done if raw VBI is active */
  89         if ((cx25840_read(client, 0x404) & 0x10) == 0)
  90                 return 0;
  91
  92         if (is_pal) {
  93                 for (i = 7; i <= 23; i++) {
  94                         u8 v = cx25840_read(client,
  95                                  state->vbi_regs_offset + 0x424 + i - 7);
  96
  97                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
  98                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
  99                         svbi->service_set |= svbi->service_lines[0][i] |
 100                                              svbi->service_lines[1][i];
 101                 }
 102         } else {
 103                 for (i = 10; i <= 21; i++) {
 104                         u8 v = cx25840_read(client,
 105                                 state->vbi_regs_offset + 0x424 + i - 10);
 106
 107                         svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 108                         svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 109                         svbi->service_set |= svbi->service_lines[0][i] |
 110                                              svbi->service_lines[1][i];
 111                 }
 112         }
 113         return 0;
 114 }
 115
 116 int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
 117 {
 118         struct i2c_client *client = v4l2_get_subdevdata(sd);
 119         struct cx25840_state *state = to_state(sd);
 120         int is_pal = !(state->std & V4L2_STD_525_60);
 121         int vbi_offset = is_pal ? 1 : 0;
 122
 123         /* Setup standard */
 124         cx25840_std_setup(client);
 125
 126         /* VBI Offset */
 127         if (is_cx23888(state))
 128                 cx25840_write(client, 0x54f, vbi_offset);
 129         else
 130                 cx25840_write(client, 0x47f, vbi_offset);
 131         cx25840_write(client, 0x404, 0x2e);
 132         return 0;
 133 }
 134
 135 int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
 136 {
 137         struct i2c_client *client = v4l2_get_subdevdata(sd);
 138         struct cx25840_state *state = to_state(sd);
 139         int is_pal = !(state->std & V4L2_STD_525_60);
 140         int vbi_offset = is_pal ? 1 : 0;
 141         int i, x;
 142         u8 lcr[24];
 143
 144         for (x = 0; x <= 23; x++)
 145                 lcr[x] = 0x00;
 146
 147         /* Setup standard */
 148         cx25840_std_setup(client);
 149
 150         /* Sliced VBI */
 151         cx25840_write(client, 0x404, 0x32);     /* Ancillary data */
 152         cx25840_write(client, 0x406, 0x13);
 153         if (is_cx23888(state))
 154                 cx25840_write(client, 0x54f, vbi_offset);
 155         else
 156                 cx25840_write(client, 0x47f, vbi_offset);
 157
 158         if (is_pal) {
 159                 for (i = 0; i <= 6; i++)
 160                         svbi->service_lines[0][i] =
 161                                 svbi->service_lines[1][i] = 0;
 162         } else {
 163                 for (i = 0; i <= 9; i++)
 164                         svbi->service_lines[0][i] =
 165                                 svbi->service_lines[1][i] = 0;
 166
 167                 for (i = 22; i <= 23; i++)
 168                         svbi->service_lines[0][i] =
 169                                 svbi->service_lines[1][i] = 0;
 170         }
 171
 172         for (i = 7; i <= 23; i++) {
 173                 for (x = 0; x <= 1; x++) {
 174                         switch (svbi->service_lines[1-x][i]) {
 175                         case V4L2_SLICED_TELETEXT_B:
 176                                 lcr[i] |= 1 << (4 * x);
 177                                 break;
 178                         case V4L2_SLICED_WSS_625:
 179                                 lcr[i] |= 4 << (4 * x);
 180                                 break;
 181                         case V4L2_SLICED_CAPTION_525:
 182                                 lcr[i] |= 6 << (4 * x);
 183                                 break;
 184                         case V4L2_SLICED_VPS:
 185                                 lcr[i] |= 9 << (4 * x);
 186                                 break;
 187                         }
 188                 }
 189         }
 190
 191         if (is_pal) {
 192                 for (x = 1, i = state->vbi_regs_offset + 0x424;
 193                      i <= state->vbi_regs_offset + 0x434; i++, x++)
 194                         cx25840_write(client, i, lcr[6 + x]);
 195         } else {
 196                 for (x = 1, i = state->vbi_regs_offset + 0x424;
 197                      i <= state->vbi_regs_offset + 0x430; i++, x++)
 198                         cx25840_write(client, i, lcr[9 + x]);
 199                 for (i = state->vbi_regs_offset + 0x431;
 200                      i <= state->vbi_regs_offset + 0x434; i++)
 201                         cx25840_write(client, i, 0);
 202         }
 203
 204         cx25840_write(client, state->vbi_regs_offset + 0x43c, 0x16);
 205         if (is_cx23888(state))
 206                 cx25840_write(client, 0x428, is_pal ? 0x2a : 0x22);
 207         else
 208                 cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
 209         return 0;
 210 }
 211
 212 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
 213 {
 214         struct cx25840_state *state = to_state(sd);
 215         u8 *p = vbi->p;
 216         int id1, id2, l, err = 0;
 217
 218         if (p[0] || p[1] != 0xff || p[2] != 0xff ||
 219                         (p[3] != 0x55 && p[3] != 0x91)) {
 220                 vbi->line = vbi->type = 0;
 221                 return 0;
 222         }
 223
 224         p += 4;
 225         id1 = p[-1];
 226         id2 = p[0] & 0xf;
 227         l = p[2] & 0x3f;
 228         l += state->vbi_line_offset;
 229         p += 4;
 230
 231         switch (id2) {
 232         case 1:
 233                 id2 = V4L2_SLICED_TELETEXT_B;
 234                 break;
 235         case 4:
 236                 id2 = V4L2_SLICED_WSS_625;
 237                 break;
 238         case 6:
 239                 id2 = V4L2_SLICED_CAPTION_525;
 240                 err = !odd_parity(p[0]) || !odd_parity(p[1]);
 241                 break;
 242         case 9:
 243                 id2 = V4L2_SLICED_VPS;
 244                 if (decode_vps(p, p) != 0)
 245                         err = 1;
 246                 break;
 247         default:
 248                 id2 = 0;
 249                 err = 1;
 250                 break;
 251         }
 252
 253         vbi->type = err ? 0 : id2;
 254         vbi->line = err ? 0 : l;
 255         vbi->is_second_field = err ? 0 : (id1 == 0x55);
 256         vbi->p = p;
 257         return 0;
 258 }