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cx25840-vbi.c
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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_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
86 {
87  struct i2c_client *client = v4l2_get_subdevdata(sd);
88  struct cx25840_state *state = to_state(sd);
89  static const u16 lcr2vbi[] = {
90  0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
91  0, V4L2_SLICED_WSS_625, 0, /* 4 */
92  V4L2_SLICED_CAPTION_525, /* 6 */
93  0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
94  0, 0, 0, 0
95  };
96  int is_pal = !(state->std & V4L2_STD_525_60);
97  int i;
98 
99  memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
100  svbi->service_set = 0;
101  /* we're done if raw VBI is active */
102  if ((cx25840_read(client, 0x404) & 0x10) == 0)
103  return 0;
104 
105  if (is_pal) {
106  for (i = 7; i <= 23; i++) {
107  u8 v = cx25840_read(client, 0x424 + i - 7);
108 
109  svbi->service_lines[0][i] = lcr2vbi[v >> 4];
110  svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
111  svbi->service_set |= svbi->service_lines[0][i] |
112  svbi->service_lines[1][i];
113  }
114  } else {
115  for (i = 10; i <= 21; i++) {
116  u8 v = cx25840_read(client, 0x424 + i - 10);
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  }
124  return 0;
125 }
126 
127 int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
128 {
129  struct i2c_client *client = v4l2_get_subdevdata(sd);
130  struct cx25840_state *state = to_state(sd);
131  int is_pal = !(state->std & V4L2_STD_525_60);
132  int vbi_offset = is_pal ? 1 : 0;
133 
134  /* Setup standard */
135  cx25840_std_setup(client);
136 
137  /* VBI Offset */
138  cx25840_write(client, 0x47f, vbi_offset);
139  cx25840_write(client, 0x404, 0x2e);
140  return 0;
141 }
142 
143 int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
144 {
145  struct i2c_client *client = v4l2_get_subdevdata(sd);
146  struct cx25840_state *state = to_state(sd);
147  int is_pal = !(state->std & V4L2_STD_525_60);
148  int vbi_offset = is_pal ? 1 : 0;
149  int i, x;
150  u8 lcr[24];
151 
152  for (x = 0; x <= 23; x++)
153  lcr[x] = 0x00;
154 
155  /* Setup standard */
156  cx25840_std_setup(client);
157 
158  /* Sliced VBI */
159  cx25840_write(client, 0x404, 0x32); /* Ancillary data */
160  cx25840_write(client, 0x406, 0x13);
161  cx25840_write(client, 0x47f, vbi_offset);
162 
163  if (is_pal) {
164  for (i = 0; i <= 6; i++)
165  svbi->service_lines[0][i] =
166  svbi->service_lines[1][i] = 0;
167  } else {
168  for (i = 0; i <= 9; i++)
169  svbi->service_lines[0][i] =
170  svbi->service_lines[1][i] = 0;
171 
172  for (i = 22; i <= 23; i++)
173  svbi->service_lines[0][i] =
174  svbi->service_lines[1][i] = 0;
175  }
176 
177  for (i = 7; i <= 23; i++) {
178  for (x = 0; x <= 1; x++) {
179  switch (svbi->service_lines[1-x][i]) {
180  case V4L2_SLICED_TELETEXT_B:
181  lcr[i] |= 1 << (4 * x);
182  break;
183  case V4L2_SLICED_WSS_625:
184  lcr[i] |= 4 << (4 * x);
185  break;
186  case V4L2_SLICED_CAPTION_525:
187  lcr[i] |= 6 << (4 * x);
188  break;
189  case V4L2_SLICED_VPS:
190  lcr[i] |= 9 << (4 * x);
191  break;
192  }
193  }
194  }
195 
196  if (is_pal) {
197  for (x = 1, i = 0x424; i <= 0x434; i++, x++)
198  cx25840_write(client, i, lcr[6 + x]);
199  } else {
200  for (x = 1, i = 0x424; i <= 0x430; i++, x++)
201  cx25840_write(client, i, lcr[9 + x]);
202  for (i = 0x431; i <= 0x434; i++)
203  cx25840_write(client, i, 0);
204  }
205 
206  cx25840_write(client, 0x43c, 0x16);
207  cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
208  return 0;
209 }
210 
211 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
212 {
213  struct cx25840_state *state = to_state(sd);
214  u8 *p = vbi->p;
215  int id1, id2, l, err = 0;
216 
217  if (p[0] || p[1] != 0xff || p[2] != 0xff ||
218  (p[3] != 0x55 && p[3] != 0x91)) {
219  vbi->line = vbi->type = 0;
220  return 0;
221  }
222 
223  p += 4;
224  id1 = p[-1];
225  id2 = p[0] & 0xf;
226  l = p[2] & 0x3f;
227  l += state->vbi_line_offset;
228  p += 4;
229 
230  switch (id2) {
231  case 1:
232  id2 = V4L2_SLICED_TELETEXT_B;
233  break;
234  case 4:
235  id2 = V4L2_SLICED_WSS_625;
236  break;
237  case 6:
238  id2 = V4L2_SLICED_CAPTION_525;
239  err = !odd_parity(p[0]) || !odd_parity(p[1]);
240  break;
241  case 9:
242  id2 = V4L2_SLICED_VPS;
243  if (decode_vps(p, p) != 0)
244  err = 1;
245  break;
246  default:
247  id2 = 0;
248  err = 1;
249  break;
250  }
251 
252  vbi->type = err ? 0 : id2;
253  vbi->line = err ? 0 : l;
254  vbi->is_second_field = err ? 0 : (id1 == 0x55);
255  vbi->p = p;
256  return 0;
257 }
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