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
odd_parity(u8 c)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
decode_vps(u8 * dst,u8 * p)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
cx25840_g_sliced_fmt(struct v4l2_subdev * sd,struct v4l2_sliced_vbi_format * svbi)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, 0, sizeof(*svbi));
100 /* we're done if raw VBI is active */
101 if ((cx25840_read(client, 0x404) & 0x10) == 0)
102 return 0;
103
104 if (is_pal) {
105 for (i = 7; i <= 23; i++) {
106 u8 v = cx25840_read(client, 0x424 + i - 7);
107
108 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
109 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
110 svbi->service_set |= svbi->service_lines[0][i] |
111 svbi->service_lines[1][i];
112 }
113 } else {
114 for (i = 10; i <= 21; i++) {
115 u8 v = cx25840_read(client, 0x424 + i - 10);
116
117 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
118 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
119 svbi->service_set |= svbi->service_lines[0][i] |
120 svbi->service_lines[1][i];
121 }
122 }
123 return 0;
124 }
125
cx25840_s_raw_fmt(struct v4l2_subdev * sd,struct v4l2_vbi_format * fmt)126 int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
127 {
128 struct i2c_client *client = v4l2_get_subdevdata(sd);
129 struct cx25840_state *state = to_state(sd);
130 int is_pal = !(state->std & V4L2_STD_525_60);
131 int vbi_offset = is_pal ? 1 : 0;
132
133 /* Setup standard */
134 cx25840_std_setup(client);
135
136 /* VBI Offset */
137 cx25840_write(client, 0x47f, vbi_offset);
138 cx25840_write(client, 0x404, 0x2e);
139 return 0;
140 }
141
cx25840_s_sliced_fmt(struct v4l2_subdev * sd,struct v4l2_sliced_vbi_format * svbi)142 int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
143 {
144 struct i2c_client *client = v4l2_get_subdevdata(sd);
145 struct cx25840_state *state = to_state(sd);
146 int is_pal = !(state->std & V4L2_STD_525_60);
147 int vbi_offset = is_pal ? 1 : 0;
148 int i, x;
149 u8 lcr[24];
150
151 for (x = 0; x <= 23; x++)
152 lcr[x] = 0x00;
153
154 /* Setup standard */
155 cx25840_std_setup(client);
156
157 /* Sliced VBI */
158 cx25840_write(client, 0x404, 0x32); /* Ancillary data */
159 cx25840_write(client, 0x406, 0x13);
160 cx25840_write(client, 0x47f, vbi_offset);
161
162 if (is_pal) {
163 for (i = 0; i <= 6; i++)
164 svbi->service_lines[0][i] =
165 svbi->service_lines[1][i] = 0;
166 } else {
167 for (i = 0; i <= 9; i++)
168 svbi->service_lines[0][i] =
169 svbi->service_lines[1][i] = 0;
170
171 for (i = 22; i <= 23; i++)
172 svbi->service_lines[0][i] =
173 svbi->service_lines[1][i] = 0;
174 }
175
176 for (i = 7; i <= 23; i++) {
177 for (x = 0; x <= 1; x++) {
178 switch (svbi->service_lines[1-x][i]) {
179 case V4L2_SLICED_TELETEXT_B:
180 lcr[i] |= 1 << (4 * x);
181 break;
182 case V4L2_SLICED_WSS_625:
183 lcr[i] |= 4 << (4 * x);
184 break;
185 case V4L2_SLICED_CAPTION_525:
186 lcr[i] |= 6 << (4 * x);
187 break;
188 case V4L2_SLICED_VPS:
189 lcr[i] |= 9 << (4 * x);
190 break;
191 }
192 }
193 }
194
195 if (is_pal) {
196 for (x = 1, i = 0x424; i <= 0x434; i++, x++)
197 cx25840_write(client, i, lcr[6 + x]);
198 } else {
199 for (x = 1, i = 0x424; i <= 0x430; i++, x++)
200 cx25840_write(client, i, lcr[9 + x]);
201 for (i = 0x431; i <= 0x434; i++)
202 cx25840_write(client, i, 0);
203 }
204
205 cx25840_write(client, 0x43c, 0x16);
206 cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
207 return 0;
208 }
209
cx25840_decode_vbi_line(struct v4l2_subdev * sd,struct v4l2_decode_vbi_line * vbi)210 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
211 {
212 struct cx25840_state *state = to_state(sd);
213 u8 *p = vbi->p;
214 int id1, id2, l, err = 0;
215
216 if (p[0] || p[1] != 0xff || p[2] != 0xff ||
217 (p[3] != 0x55 && p[3] != 0x91)) {
218 vbi->line = vbi->type = 0;
219 return 0;
220 }
221
222 p += 4;
223 id1 = p[-1];
224 id2 = p[0] & 0xf;
225 l = p[2] & 0x3f;
226 l += state->vbi_line_offset;
227 p += 4;
228
229 switch (id2) {
230 case 1:
231 id2 = V4L2_SLICED_TELETEXT_B;
232 break;
233 case 4:
234 id2 = V4L2_SLICED_WSS_625;
235 break;
236 case 6:
237 id2 = V4L2_SLICED_CAPTION_525;
238 err = !odd_parity(p[0]) || !odd_parity(p[1]);
239 break;
240 case 9:
241 id2 = V4L2_SLICED_VPS;
242 if (decode_vps(p, p) != 0)
243 err = 1;
244 break;
245 default:
246 id2 = 0;
247 err = 1;
248 break;
249 }
250
251 vbi->type = err ? 0 : id2;
252 vbi->line = err ? 0 : l;
253 vbi->is_second_field = err ? 0 : (id1 == 0x55);
254 vbi->p = p;
255 return 0;
256 }
257