]> err.no Git - linux-2.6/blob - drivers/media/video/cx18/cx18-av-vbi.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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 }