aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/cx25840/cx25840-vbi.c
blob: 13ba4e15ddea9ae10ae25597d7d3039cc4552c9d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
/* cx25840 VBI functions
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */


#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <media/v4l2-common.h>

#include "cx25840.h"

static inline int odd_parity(u8 c)
{
	c ^= (c >> 4);
	c ^= (c >> 2);
	c ^= (c >> 1);

	return c & 1;
}

static inline int decode_vps(u8 * dst, u8 * p)
{
	static const u8 biphase_tbl[] = {
		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
		0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
		0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
		0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
		0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
		0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
		0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
		0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
		0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
	};

	u8 c, err = 0;
	int i;

	for (i = 0; i < 2 * 13; i += 2) {
		err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
		c = (biphase_tbl[p[i + 1]] & 0xf) |
		    ((biphase_tbl[p[i]] & 0xf) << 4);
		dst[i / 2] = c;
	}

	return err & 0xf0;
}

void cx25840_vbi_setup(struct i2c_client *client)
{
	v4l2_std_id std = cx25840_get_v4lstd(client);

	if (std & ~V4L2_STD_NTSC) {
		/* datasheet startup, step 8d */
		cx25840_write(client, 0x49f, 0x11);

		cx25840_write(client, 0x470, 0x84);
		cx25840_write(client, 0x471, 0x00);
		cx25840_write(client, 0x472, 0x2d);
		cx25840_write(client, 0x473, 0x5d);

		cx25840_write(client, 0x474, 0x24);
		cx25840_write(client, 0x475, 0x40);
		cx25840_write(client, 0x476, 0x24);
		cx25840_write(client, 0x477, 0x28);

		cx25840_write(client, 0x478, 0x1f);
		cx25840_write(client, 0x479, 0x02);

		if (std & V4L2_STD_SECAM) {
			cx25840_write(client, 0x47a, 0x80);
			cx25840_write(client, 0x47b, 0x00);
			cx25840_write(client, 0x47c, 0x5f);
			cx25840_write(client, 0x47d, 0x42);
		} else {
			cx25840_write(client, 0x47a, 0x90);
			cx25840_write(client, 0x47b, 0x20);
			cx25840_write(client, 0x47c, 0x63);
			cx25840_write(client, 0x47d, 0x82);
		}

		cx25840_write(client, 0x47e, 0x0a);
		cx25840_write(client, 0x47f, 0x01);
	} else {
		/* datasheet startup, step 8d */
		cx25840_write(client, 0x49f, 0x14);

		cx25840_write(client, 0x470, 0x7a);
		cx25840_write(client, 0x471, 0x00);
		cx25840_write(client, 0x472, 0x2d);
		cx25840_write(client, 0x473, 0x5b);

		cx25840_write(client, 0x474, 0x1a);
		cx25840_write(client, 0x475, 0x70);
		cx25840_write(client, 0x476, 0x1e);
		cx25840_write(client, 0x477, 0x1e);

		cx25840_write(client, 0x478, 0x1f);
		cx25840_write(client, 0x479, 0x02);
		cx25840_write(client, 0x47a, 0x50);
		cx25840_write(client, 0x47b, 0x66);

		cx25840_write(client, 0x47c, 0x1f);
		cx25840_write(client, 0x47d, 0x7c);
		cx25840_write(client, 0x47e, 0x08);
		cx25840_write(client, 0x47f, 0x00);
	}
}

int cx25840_vbi(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct v4l2_format *fmt;
	struct v4l2_sliced_vbi_format *svbi;

	switch (cmd) {
	case VIDIOC_G_FMT:
	{
		static u16 lcr2vbi[] = {
			0, V4L2_SLICED_TELETEXT_B, 0,	/* 1 */
			0, V4L2_SLICED_WSS_625, 0,	/* 4 */
			V4L2_SLICED_CAPTION_525,	/* 6 */
			0, 0, V4L2_SLICED_VPS, 0, 0,	/* 9 */
			0, 0, 0, 0
		};
		int i;

		fmt = arg;
		if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
			return -EINVAL;
		svbi = &fmt->fmt.sliced;
		memset(svbi, 0, sizeof(*svbi));
		/* we're done if raw VBI is active */
		if ((cx25840_read(client, 0x404) & 0x10) == 0)
			break;

		for (i = 7; i <= 23; i++) {
			u8 v = cx25840_read(client, 0x424 + i - 7);

			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
			svbi->service_set |=
				 svbi->service_lines[0][i] | svbi->service_lines[1][i];
		}
		break;
	}

	case VIDIOC_S_FMT:
	{
		int is_pal = !(cx25840_get_v4lstd(client) & V4L2_STD_NTSC);
		int vbi_offset = is_pal ? 1 : 0;
		int i, x;
		u8 lcr[24];

		fmt = arg;
		if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
			return -EINVAL;
		svbi = &fmt->fmt.sliced;
		if (svbi->service_set == 0) {
			/* raw VBI */
			memset(svbi, 0, sizeof(*svbi));

			/* Setup VBI */
			cx25840_vbi_setup(client);

			/* VBI Offset */
			cx25840_write(client, 0x47f, vbi_offset);
			cx25840_write(client, 0x404, 0x2e);
			break;
		}

		for (x = 0; x <= 23; x++)
			lcr[x] = 0x00;

		/* Setup VBI */
		cx25840_vbi_setup(client);

		/* Sliced VBI */
		cx25840_write(client, 0x404, 0x36);	/* Ancillery data */
		cx25840_write(client, 0x406, 0x13);
		cx25840_write(client, 0x47f, vbi_offset);

		if (is_pal) {
			for (i = 0; i <= 6; i++)
				svbi->service_lines[0][i] =
					svbi->service_lines[1][i] = 0;
		} else {
			for (i = 0; i <= 9; i++)
				svbi->service_lines[0][i] =
					svbi->service_lines[1][i] = 0;

			for (i = 22; i <= 23; i++)
				svbi->service_lines[0][i] =
					svbi->service_lines[1][i] = 0;
		}

		for (i = 7; i <= 23; i++) {
			for (x = 0; x <= 1; x++) {
				switch (svbi->service_lines[1-x][i]) {
				case V4L2_SLICED_TELETEXT_B:
					lcr[i] |= 1 << (4 * x);
					break;
				case V4L2_SLICED_WSS_625:
					lcr[i] |= 4 << (4 * x);
					break;
				case V4L2_SLICED_CAPTION_525:
					lcr[i] |= 6 << (4 * x);
					break;
				case V4L2_SLICED_VPS:
					lcr[i] |= 9 << (4 * x);
					break;
				}
			}
		}

		for (x = 1, i = 0x424; i <= 0x434; i++, x++) {
			cx25840_write(client, i, lcr[6 + x]);
		}

		cx25840_write(client, 0x43c, 0x16);

		if (is_pal) {
			cx25840_write(client, 0x474, 0x2a);
		} else {
			cx25840_write(client, 0x474, 0x1a + 6);
		}
		break;
	}

	case VIDIOC_INT_DECODE_VBI_LINE:
	{
		struct v4l2_decode_vbi_line *vbi = arg;
		u8 *p = vbi->p;
		int id1, id2, l, err = 0;

		if (p[0] || p[1] != 0xff || p[2] != 0xff ||
		    (p[3] != 0x55 && p[3] != 0x91)) {
			vbi->line = vbi->type = 0;
			break;
		}

		p += 4;
		id1 = p[-1];
		id2 = p[0] & 0xf;
		l = p[2] & 0x3f;
		l += 5;
		p += 4;

		switch (id2) {
		case 1:
			id2 = V4L2_SLICED_TELETEXT_B;
			break;
		case 4:
			id2 = V4L2_SLICED_WSS_625;
			break;
		case 6:
			id2 = V4L2_SLICED_CAPTION_525;
			err = !odd_parity(p[0]) || !odd_parity(p[1]);
			break;
		case 9:
			id2 = V4L2_SLICED_VPS;
			if (decode_vps(p, p) != 0) {
				err = 1;
			}
			break;
		default:
			id2 = 0;
			err = 1;
			break;
		}

		vbi->type = err ? 0 : id2;
		vbi->line = err ? 0 : l;
		vbi->is_second_field = err ? 0 : (id1 == 0x55);
		vbi->p = p;
		break;
	}
	}

	return 0;
}