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 
14 
15 #include <linux/videodev2.h>
16 #include <linux/i2c.h>
17 #include <media/v4l2-common.h>
18 #include <media/drv-intf/cx25840.h>
19 
20 #include "cx25840-core.h"
21 
22 static int odd_parity(u8 c)
23 {
24 	c ^= (c >> 4);
25 	c ^= (c >> 2);
26 	c ^= (c >> 1);
27 
28 	return c & 1;
29 }
30 
31 static int decode_vps(u8 * dst, u8 * p)
32 {
33 	static const u8 biphase_tbl[] = {
34 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
35 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
36 		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
37 		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
38 		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
39 		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
40 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
41 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
42 		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
43 		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
44 		0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
45 		0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
46 		0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
47 		0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
48 		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
49 		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
50 		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
51 		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
52 		0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
53 		0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
54 		0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
55 		0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
56 		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
57 		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
58 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
59 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
60 		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
61 		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
62 		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
63 		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
64 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
65 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
66 	};
67 
68 	u8 c, err = 0;
69 	int i;
70 
71 	for (i = 0; i < 2 * 13; i += 2) {
72 		err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
73 		c = (biphase_tbl[p[i + 1]] & 0xf) |
74 		    ((biphase_tbl[p[i]] & 0xf) << 4);
75 		dst[i / 2] = c;
76 	}
77 
78 	return err & 0xf0;
79 }
80 
81 int cx25840_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
82 {
83 	struct i2c_client *client = v4l2_get_subdevdata(sd);
84 	struct cx25840_state *state = to_state(sd);
85 	static const u16 lcr2vbi[] = {
86 		0, V4L2_SLICED_TELETEXT_B, 0,	/* 1 */
87 		0, V4L2_SLICED_WSS_625, 0,	/* 4 */
88 		V4L2_SLICED_CAPTION_525,	/* 6 */
89 		0, 0, V4L2_SLICED_VPS, 0, 0,	/* 9 */
90 		0, 0, 0, 0
91 	};
92 	int is_pal = !(state->std & V4L2_STD_525_60);
93 	int i;
94 
95 	memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
96 	svbi->service_set = 0;
97 	/* we're done if raw VBI is active */
98 	if ((cx25840_read(client, 0x404) & 0x10) == 0)
99 		return 0;
100 
101 	if (is_pal) {
102 		for (i = 7; i <= 23; i++) {
103 			u8 v = cx25840_read(client,
104 				 state->vbi_regs_offset + 0x424 + i - 7);
105 
106 			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
107 			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
108 			svbi->service_set |= svbi->service_lines[0][i] |
109 					     svbi->service_lines[1][i];
110 		}
111 	} else {
112 		for (i = 10; i <= 21; i++) {
113 			u8 v = cx25840_read(client,
114 				state->vbi_regs_offset + 0x424 + i - 10);
115 
116 			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
117 			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
118 			svbi->service_set |= svbi->service_lines[0][i] |
119 					     svbi->service_lines[1][i];
120 		}
121 	}
122 	return 0;
123 }
124 
125 int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
126 {
127 	struct i2c_client *client = v4l2_get_subdevdata(sd);
128 	struct cx25840_state *state = to_state(sd);
129 	int is_pal = !(state->std & V4L2_STD_525_60);
130 	int vbi_offset = is_pal ? 1 : 0;
131 
132 	/* Setup standard */
133 	cx25840_std_setup(client);
134 
135 	/* VBI Offset */
136 	if (is_cx23888(state))
137 		cx25840_write(client, 0x54f, vbi_offset);
138 	else
139 		cx25840_write(client, 0x47f, vbi_offset);
140 	cx25840_write(client, 0x404, 0x2e);
141 	return 0;
142 }
143 
144 int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
145 {
146 	struct i2c_client *client = v4l2_get_subdevdata(sd);
147 	struct cx25840_state *state = to_state(sd);
148 	int is_pal = !(state->std & V4L2_STD_525_60);
149 	int vbi_offset = is_pal ? 1 : 0;
150 	int i, x;
151 	u8 lcr[24];
152 
153 	for (x = 0; x <= 23; x++)
154 		lcr[x] = 0x00;
155 
156 	/* Setup standard */
157 	cx25840_std_setup(client);
158 
159 	/* Sliced VBI */
160 	cx25840_write(client, 0x404, 0x32);	/* Ancillary data */
161 	cx25840_write(client, 0x406, 0x13);
162 	if (is_cx23888(state))
163 		cx25840_write(client, 0x54f, vbi_offset);
164 	else
165 		cx25840_write(client, 0x47f, vbi_offset);
166 
167 	if (is_pal) {
168 		for (i = 0; i <= 6; i++)
169 			svbi->service_lines[0][i] =
170 				svbi->service_lines[1][i] = 0;
171 	} else {
172 		for (i = 0; i <= 9; i++)
173 			svbi->service_lines[0][i] =
174 				svbi->service_lines[1][i] = 0;
175 
176 		for (i = 22; i <= 23; i++)
177 			svbi->service_lines[0][i] =
178 				svbi->service_lines[1][i] = 0;
179 	}
180 
181 	for (i = 7; i <= 23; i++) {
182 		for (x = 0; x <= 1; x++) {
183 			switch (svbi->service_lines[1-x][i]) {
184 			case V4L2_SLICED_TELETEXT_B:
185 				lcr[i] |= 1 << (4 * x);
186 				break;
187 			case V4L2_SLICED_WSS_625:
188 				lcr[i] |= 4 << (4 * x);
189 				break;
190 			case V4L2_SLICED_CAPTION_525:
191 				lcr[i] |= 6 << (4 * x);
192 				break;
193 			case V4L2_SLICED_VPS:
194 				lcr[i] |= 9 << (4 * x);
195 				break;
196 			}
197 		}
198 	}
199 
200 	if (is_pal) {
201 		for (x = 1, i = state->vbi_regs_offset + 0x424;
202 		     i <= state->vbi_regs_offset + 0x434; i++, x++)
203 			cx25840_write(client, i, lcr[6 + x]);
204 	} else {
205 		for (x = 1, i = state->vbi_regs_offset + 0x424;
206 		     i <= state->vbi_regs_offset + 0x430; i++, x++)
207 			cx25840_write(client, i, lcr[9 + x]);
208 		for (i = state->vbi_regs_offset + 0x431;
209 		     i <= state->vbi_regs_offset + 0x434; i++)
210 			cx25840_write(client, i, 0);
211 	}
212 
213 	cx25840_write(client, state->vbi_regs_offset + 0x43c, 0x16);
214 	if (is_cx23888(state))
215 		cx25840_write(client, 0x428, is_pal ? 0x2a : 0x22);
216 	else
217 		cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
218 	return 0;
219 }
220 
221 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
222 {
223 	struct cx25840_state *state = to_state(sd);
224 	u8 *p = vbi->p;
225 	int id1, id2, l, err = 0;
226 
227 	if (p[0] || p[1] != 0xff || p[2] != 0xff ||
228 			(p[3] != 0x55 && p[3] != 0x91)) {
229 		vbi->line = vbi->type = 0;
230 		return 0;
231 	}
232 
233 	p += 4;
234 	id1 = p[-1];
235 	id2 = p[0] & 0xf;
236 	l = p[2] & 0x3f;
237 	l += state->vbi_line_offset;
238 	p += 4;
239 
240 	switch (id2) {
241 	case 1:
242 		id2 = V4L2_SLICED_TELETEXT_B;
243 		break;
244 	case 4:
245 		id2 = V4L2_SLICED_WSS_625;
246 		break;
247 	case 6:
248 		id2 = V4L2_SLICED_CAPTION_525;
249 		err = !odd_parity(p[0]) || !odd_parity(p[1]);
250 		break;
251 	case 9:
252 		id2 = V4L2_SLICED_VPS;
253 		if (decode_vps(p, p) != 0)
254 			err = 1;
255 		break;
256 	default:
257 		id2 = 0;
258 		err = 1;
259 		break;
260 	}
261 
262 	vbi->type = err ? 0 : id2;
263 	vbi->line = err ? 0 : l;
264 	vbi->is_second_field = err ? 0 : (id1 == 0x55);
265 	vbi->p = p;
266 	return 0;
267 }
268