1// SPDX-License-Identifier: GPL-2.0-or-later
2/* cx25840 VBI functions
3 */
4
5
6#include <linux/videodev2.h>
7#include <linux/i2c.h>
8#include <media/v4l2-common.h>
9#include <media/drv-intf/cx25840.h>
10
11#include "cx25840-core.h"
12
13static int odd_parity(u8 c)
14{
15 c ^= (c >> 4);
16 c ^= (c >> 2);
17 c ^= (c >> 1);
18
19 return c & 1;
20}
21
22static int decode_vps(u8 * dst, u8 * p)
23{
24 static const u8 biphase_tbl[] = {
25 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
26 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
27 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
28 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
29 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
30 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
31 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
32 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
33 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
34 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
35 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
36 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
37 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
38 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
39 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
40 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
41 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
42 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
43 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
44 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
45 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
46 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
47 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
48 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
49 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
50 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
51 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
52 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
53 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
54 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
55 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
56 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
57 };
58
59 u8 c, err = 0;
60 int i;
61
62 for (i = 0; i < 2 * 13; i += 2) {
63 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
64 c = (biphase_tbl[p[i + 1]] & 0xf) |
65 ((biphase_tbl[p[i]] & 0xf) << 4);
66 dst[i / 2] = c;
67 }
68
69 return err & 0xf0;
70}
71
72int cx25840_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
73{
74 struct i2c_client *client = v4l2_get_subdevdata(sd);
75 struct cx25840_state *state = to_state(sd);
76 static const u16 lcr2vbi[] = {
77 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
78 0, V4L2_SLICED_WSS_625, 0, /* 4 */
79 V4L2_SLICED_CAPTION_525, /* 6 */
80 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
81 0, 0, 0, 0
82 };
83 int is_pal = !(state->std & V4L2_STD_525_60);
84 int i;
85
86 memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
87 svbi->service_set = 0;
88 /* we're done if raw VBI is active */
89 /* TODO: this will have to be changed for generic_mode VBI */
90 if ((cx25840_read(client, addr: 0x404) & 0x10) == 0)
91 return 0;
92
93 if (is_pal) {
94 for (i = 7; i <= 23; i++) {
95 u8 v = cx25840_read(client,
96 addr: state->vbi_regs_offset + 0x424 + i - 7);
97
98 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
99 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
100 svbi->service_set |= svbi->service_lines[0][i] |
101 svbi->service_lines[1][i];
102 }
103 } else {
104 for (i = 10; i <= 21; i++) {
105 u8 v = cx25840_read(client,
106 addr: state->vbi_regs_offset + 0x424 + i - 10);
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 }
114 return 0;
115}
116
117int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
118{
119 struct i2c_client *client = v4l2_get_subdevdata(sd);
120 struct cx25840_state *state = to_state(sd);
121 int is_pal = !(state->std & V4L2_STD_525_60);
122 int vbi_offset = is_pal ? 1 : 0;
123
124 /* Setup standard */
125 cx25840_std_setup(client);
126
127 /* VBI Offset */
128 if (is_cx23888(state))
129 cx25840_write(client, addr: 0x54f, value: vbi_offset);
130 else
131 cx25840_write(client, addr: 0x47f, value: vbi_offset);
132 /* TODO: this will have to be changed for generic_mode VBI */
133 cx25840_write(client, addr: 0x404, value: 0x2e);
134 return 0;
135}
136
137int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
138{
139 struct i2c_client *client = v4l2_get_subdevdata(sd);
140 struct cx25840_state *state = to_state(sd);
141 int is_pal = !(state->std & V4L2_STD_525_60);
142 int vbi_offset = is_pal ? 1 : 0;
143 int i, x;
144 u8 lcr[24];
145
146 for (x = 0; x <= 23; x++)
147 lcr[x] = 0x00;
148
149 /* Setup standard */
150 cx25840_std_setup(client);
151
152 /* Sliced VBI */
153 /* TODO: this will have to be changed for generic_mode VBI */
154 cx25840_write(client, addr: 0x404, value: 0x32); /* Ancillary data */
155 cx25840_write(client, addr: 0x406, value: 0x13);
156 if (is_cx23888(state))
157 cx25840_write(client, addr: 0x54f, value: vbi_offset);
158 else
159 cx25840_write(client, addr: 0x47f, value: vbi_offset);
160
161 if (is_pal) {
162 for (i = 0; i <= 6; i++)
163 svbi->service_lines[0][i] =
164 svbi->service_lines[1][i] = 0;
165 } else {
166 for (i = 0; i <= 9; i++)
167 svbi->service_lines[0][i] =
168 svbi->service_lines[1][i] = 0;
169
170 for (i = 22; i <= 23; i++)
171 svbi->service_lines[0][i] =
172 svbi->service_lines[1][i] = 0;
173 }
174
175 for (i = 7; i <= 23; i++) {
176 for (x = 0; x <= 1; x++) {
177 switch (svbi->service_lines[1-x][i]) {
178 case V4L2_SLICED_TELETEXT_B:
179 lcr[i] |= 1 << (4 * x);
180 break;
181 case V4L2_SLICED_WSS_625:
182 lcr[i] |= 4 << (4 * x);
183 break;
184 case V4L2_SLICED_CAPTION_525:
185 lcr[i] |= 6 << (4 * x);
186 break;
187 case V4L2_SLICED_VPS:
188 lcr[i] |= 9 << (4 * x);
189 break;
190 }
191 }
192 }
193
194 if (is_pal) {
195 for (x = 1, i = state->vbi_regs_offset + 0x424;
196 i <= state->vbi_regs_offset + 0x434; i++, x++)
197 cx25840_write(client, addr: i, value: lcr[6 + x]);
198 } else {
199 for (x = 1, i = state->vbi_regs_offset + 0x424;
200 i <= state->vbi_regs_offset + 0x430; i++, x++)
201 cx25840_write(client, addr: i, value: lcr[9 + x]);
202 for (i = state->vbi_regs_offset + 0x431;
203 i <= state->vbi_regs_offset + 0x434; i++)
204 cx25840_write(client, addr: i, value: 0);
205 }
206
207 cx25840_write(client, addr: state->vbi_regs_offset + 0x43c, value: 0x16);
208 /* TODO: this will have to be changed for generic_mode VBI */
209 if (is_cx23888(state))
210 cx25840_write(client, addr: 0x428, value: is_pal ? 0x2a : 0x22);
211 else
212 cx25840_write(client, addr: 0x474, value: is_pal ? 0x2a : 0x22);
213 return 0;
214}
215
216int 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(c: p[0]) || !odd_parity(c: p[1]);
245 break;
246 case 9:
247 id2 = V4L2_SLICED_VPS;
248 if (decode_vps(dst: 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

source code of linux/drivers/media/i2c/cx25840/cx25840-vbi.c