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_vbi_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
86 {
87 struct i2c_client *client = v4l2_get_subdevdata(sd);
88 struct cx25840_state *state = to_state(sd);
89 struct v4l2_sliced_vbi_format *svbi;
90 static const u16 lcr2vbi[] = {
91 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
92 0, V4L2_SLICED_WSS_625, 0, /* 4 */
93 V4L2_SLICED_CAPTION_525, /* 6 */
94 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
95 0, 0, 0, 0
96 };
97 int is_pal = !(state->std & V4L2_STD_525_60);
98 int i;
99
100 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
101 return -EINVAL;
102 svbi = &fmt->fmt.sliced;
103 memset(svbi, 0, sizeof(*svbi));
104 /* we're done if raw VBI is active */
105 if ((cx25840_read(client, 0x404) & 0x10) == 0)
106 return 0;
107
108 if (is_pal) {
109 for (i = 7; i <= 23; i++) {
110 u8 v = cx25840_read(client, 0x424 + i - 7);
111
112 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
113 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
114 svbi->service_set |= svbi->service_lines[0][i] |
115 svbi->service_lines[1][i];
116 }
117 } else {
118 for (i = 10; i <= 21; i++) {
119 u8 v = cx25840_read(client, 0x424 + i - 10);
120
121 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
122 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
123 svbi->service_set |= svbi->service_lines[0][i] |
124 svbi->service_lines[1][i];
125 }
126 }
127 return 0;
128 }
129
130 int cx25840_vbi_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
131 {
132 struct i2c_client *client = v4l2_get_subdevdata(sd);
133 struct cx25840_state *state = to_state(sd);
134 struct v4l2_sliced_vbi_format *svbi;
135 int is_pal = !(state->std & V4L2_STD_525_60);
136 int vbi_offset = is_pal ? 1 : 0;
137 int i, x;
138 u8 lcr[24];
139
140 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE &&
141 fmt->type != V4L2_BUF_TYPE_VBI_CAPTURE)
142 return -EINVAL;
143 svbi = &fmt->fmt.sliced;
144 if (fmt->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
145 /* raw VBI */
146 memset(svbi, 0, sizeof(*svbi));
147
148 /* Setup standard */
149 cx25840_std_setup(client);
150
151 /* VBI Offset */
152 cx25840_write(client, 0x47f, vbi_offset);
153 cx25840_write(client, 0x404, 0x2e);
154 return 0;
155 }
156
157 for (x = 0; x <= 23; x++)
158 lcr[x] = 0x00;
159
160 /* Setup standard */
161 cx25840_std_setup(client);
162
163 /* Sliced VBI */
164 cx25840_write(client, 0x404, 0x32); /* Ancillary data */
165 cx25840_write(client, 0x406, 0x13);
166 cx25840_write(client, 0x47f, vbi_offset);
167
168 if (is_pal) {
169 for (i = 0; i <= 6; i++)
170 svbi->service_lines[0][i] =
171 svbi->service_lines[1][i] = 0;
172 } else {
173 for (i = 0; i <= 9; i++)
174 svbi->service_lines[0][i] =
175 svbi->service_lines[1][i] = 0;
176
177 for (i = 22; i <= 23; i++)
178 svbi->service_lines[0][i] =
179 svbi->service_lines[1][i] = 0;
180 }
181
182 for (i = 7; i <= 23; i++) {
183 for (x = 0; x <= 1; x++) {
184 switch (svbi->service_lines[1-x][i]) {
185 case V4L2_SLICED_TELETEXT_B:
186 lcr[i] |= 1 << (4 * x);
187 break;
188 case V4L2_SLICED_WSS_625:
189 lcr[i] |= 4 << (4 * x);
190 break;
191 case V4L2_SLICED_CAPTION_525:
192 lcr[i] |= 6 << (4 * x);
193 break;
194 case V4L2_SLICED_VPS:
195 lcr[i] |= 9 << (4 * x);
196 break;
197 }
198 }
199 }
200
201 if (is_pal) {
202 for (x = 1, i = 0x424; i <= 0x434; i++, x++)
203 cx25840_write(client, i, lcr[6 + x]);
204 } else {
205 for (x = 1, i = 0x424; i <= 0x430; i++, x++)
206 cx25840_write(client, i, lcr[9 + x]);
207 for (i = 0x431; i <= 0x434; i++)
208 cx25840_write(client, i, 0);
209 }
210
211 cx25840_write(client, 0x43c, 0x16);
212 cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
213 return 0;
214 }
215
216 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
217 {
218 struct cx25840_state *state = to_state(sd);
219 u8 *p = vbi->p;
220 int id1, id2, l, err = 0;
221
222 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
223 (p[3] != 0x55 && p[3] != 0x91)) {
224 vbi->line = vbi->type = 0;
225 return 0;
226 }
227
228 p += 4;
229 id1 = p[-1];
230 id2 = p[0] & 0xf;
231 l = p[2] & 0x3f;
232 l += state->vbi_line_offset;
233 p += 4;
234
235 switch (id2) {
236 case 1:
237 id2 = V4L2_SLICED_TELETEXT_B;
238 break;
239 case 4:
240 id2 = V4L2_SLICED_WSS_625;
241 break;
242 case 6:
243 id2 = V4L2_SLICED_CAPTION_525;
244 err = !odd_parity(p[0]) || !odd_parity(p[1]);
245 break;
246 case 9:
247 id2 = V4L2_SLICED_VPS;
248 if (decode_vps(p, p) != 0)
249 err = 1;
250 break;
251 default:
252 id2 = 0;
253 err = 1;
254 break;
255 }
256
257 vbi->type = err ? 0 : id2;
258 vbi->line = err ? 0 : l;
259 vbi->is_second_field = err ? 0 : (id1 == 0x55);
260 vbi->p = p;
261 return 0;
262 }
263
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