1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * cx18 ADEC VBI functions
4 *
5 * Derived from cx25840-vbi.c
6 *
7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 */
9
10
11 #include "cx18-driver.h"
12
13 /*
14 * For sliced VBI output, we set up to use VIP-1.1, 8-bit mode,
15 * NN counts 1 byte Dwords, an IDID with the VBI line # in it.
16 * Thus, according to the VIP-2 Spec, our VBI ancillary data lines
17 * (should!) look like:
18 * 4 byte EAV code: 0xff 0x00 0x00 0xRP
19 * unknown number of possible idle bytes
20 * 3 byte Anc data preamble: 0x00 0xff 0xff
21 * 1 byte data identifier: ne010iii (parity bits, 010, DID bits)
22 * 1 byte secondary data id: nessssss (parity bits, SDID bits)
23 * 1 byte data word count: necccccc (parity bits, NN Dword count)
24 * 2 byte Internal DID: VBI-line-# 0x80
25 * NN data bytes
26 * 1 byte checksum
27 * Fill bytes needed to fil out to 4*NN bytes of payload
28 *
29 * The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, &
30 * in the vertical blanking interval are:
31 * 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0)
32 * 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0)
33 *
34 * Since the V bit is only allowed to toggle in the EAV RP code, just
35 * before the first active region line and for active lines, they are:
36 * 0x90 (Task 0 0 HorizontalBlank 0 0 0 0)
37 * 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0)
38 *
39 * The user application DID bytes we care about are:
40 * 0x91 (1 0 010 0 !ActiveLine AncDataPresent)
41 * 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent)
42 *
43 */
44 static const u8 sliced_vbi_did[2] = { 0x91, 0x55 };
45
46 struct vbi_anc_data {
47 /* u8 eav[4]; */
48 /* u8 idle[]; Variable number of idle bytes */
49 u8 preamble[3];
50 u8 did;
51 u8 sdid;
52 u8 data_count;
53 u8 idid[2];
54 u8 payload[]; /* data_count of payload */
55 /* u8 checksum; */
56 /* u8 fill[]; Variable number of fill bytes */
57 };
58
odd_parity(u8 c)59 static int odd_parity(u8 c)
60 {
61 c ^= (c >> 4);
62 c ^= (c >> 2);
63 c ^= (c >> 1);
64
65 return c & 1;
66 }
67
decode_vps(u8 * dst,u8 * p)68 static int decode_vps(u8 *dst, u8 *p)
69 {
70 static const u8 biphase_tbl[] = {
71 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
72 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
73 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
74 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
75 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
76 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
77 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
78 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
79 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
80 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
81 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
82 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
83 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
84 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
85 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
86 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
87 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
88 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
89 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
90 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
91 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
92 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
93 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
94 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
95 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
96 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
97 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
98 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
99 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
100 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
101 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
102 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
103 };
104
105 u8 c, err = 0;
106 int i;
107
108 for (i = 0; i < 2 * 13; i += 2) {
109 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
110 c = (biphase_tbl[p[i + 1]] & 0xf) |
111 ((biphase_tbl[p[i]] & 0xf) << 4);
112 dst[i / 2] = c;
113 }
114
115 return err & 0xf0;
116 }
117
cx18_av_g_sliced_fmt(struct v4l2_subdev * sd,struct v4l2_sliced_vbi_format * svbi)118 int cx18_av_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
119 {
120 struct cx18 *cx = v4l2_get_subdevdata(sd);
121 struct cx18_av_state *state = &cx->av_state;
122 static const u16 lcr2vbi[] = {
123 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
124 0, V4L2_SLICED_WSS_625, 0, /* 4 */
125 V4L2_SLICED_CAPTION_525, /* 6 */
126 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
127 0, 0, 0, 0
128 };
129 int is_pal = !(state->std & V4L2_STD_525_60);
130 int i;
131
132 memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
133 svbi->service_set = 0;
134
135 /* we're done if raw VBI is active */
136 if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
137 return 0;
138
139 if (is_pal) {
140 for (i = 7; i <= 23; i++) {
141 u8 v = cx18_av_read(cx, 0x424 + i - 7);
142
143 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
144 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
145 svbi->service_set |= svbi->service_lines[0][i] |
146 svbi->service_lines[1][i];
147 }
148 } else {
149 for (i = 10; i <= 21; i++) {
150 u8 v = cx18_av_read(cx, 0x424 + i - 10);
151
152 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
153 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
154 svbi->service_set |= svbi->service_lines[0][i] |
155 svbi->service_lines[1][i];
156 }
157 }
158 return 0;
159 }
160
cx18_av_s_raw_fmt(struct v4l2_subdev * sd,struct v4l2_vbi_format * fmt)161 int cx18_av_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
162 {
163 struct cx18 *cx = v4l2_get_subdevdata(sd);
164 struct cx18_av_state *state = &cx->av_state;
165
166 /* Setup standard */
167 cx18_av_std_setup(cx);
168
169 /* VBI Offset */
170 cx18_av_write(cx, 0x47f, state->slicer_line_delay);
171 cx18_av_write(cx, 0x404, 0x2e);
172 return 0;
173 }
174
cx18_av_s_sliced_fmt(struct v4l2_subdev * sd,struct v4l2_sliced_vbi_format * svbi)175 int cx18_av_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
176 {
177 struct cx18 *cx = v4l2_get_subdevdata(sd);
178 struct cx18_av_state *state = &cx->av_state;
179 int is_pal = !(state->std & V4L2_STD_525_60);
180 int i, x;
181 u8 lcr[24];
182
183 for (x = 0; x <= 23; x++)
184 lcr[x] = 0x00;
185
186 /* Setup standard */
187 cx18_av_std_setup(cx);
188
189 /* Sliced VBI */
190 cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */
191 cx18_av_write(cx, 0x406, 0x13);
192 cx18_av_write(cx, 0x47f, state->slicer_line_delay);
193
194 /* Force impossible lines to 0 */
195 if (is_pal) {
196 for (i = 0; i <= 6; i++)
197 svbi->service_lines[0][i] =
198 svbi->service_lines[1][i] = 0;
199 } else {
200 for (i = 0; i <= 9; i++)
201 svbi->service_lines[0][i] =
202 svbi->service_lines[1][i] = 0;
203
204 for (i = 22; i <= 23; i++)
205 svbi->service_lines[0][i] =
206 svbi->service_lines[1][i] = 0;
207 }
208
209 /* Build register values for requested service lines */
210 for (i = 7; i <= 23; i++) {
211 for (x = 0; x <= 1; x++) {
212 switch (svbi->service_lines[1-x][i]) {
213 case V4L2_SLICED_TELETEXT_B:
214 lcr[i] |= 1 << (4 * x);
215 break;
216 case V4L2_SLICED_WSS_625:
217 lcr[i] |= 4 << (4 * x);
218 break;
219 case V4L2_SLICED_CAPTION_525:
220 lcr[i] |= 6 << (4 * x);
221 break;
222 case V4L2_SLICED_VPS:
223 lcr[i] |= 9 << (4 * x);
224 break;
225 }
226 }
227 }
228
229 if (is_pal) {
230 for (x = 1, i = 0x424; i <= 0x434; i++, x++)
231 cx18_av_write(cx, i, lcr[6 + x]);
232 } else {
233 for (x = 1, i = 0x424; i <= 0x430; i++, x++)
234 cx18_av_write(cx, i, lcr[9 + x]);
235 for (i = 0x431; i <= 0x434; i++)
236 cx18_av_write(cx, i, 0);
237 }
238
239 cx18_av_write(cx, 0x43c, 0x16);
240 /* Should match vblank set in cx18_av_std_setup() */
241 cx18_av_write(cx, 0x474, is_pal ? 38 : 26);
242 return 0;
243 }
244
cx18_av_decode_vbi_line(struct v4l2_subdev * sd,struct v4l2_decode_vbi_line * vbi)245 int cx18_av_decode_vbi_line(struct v4l2_subdev *sd,
246 struct v4l2_decode_vbi_line *vbi)
247 {
248 struct cx18 *cx = v4l2_get_subdevdata(sd);
249 struct cx18_av_state *state = &cx->av_state;
250 struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p;
251 u8 *p;
252 int did, sdid, l, err = 0;
253
254 /*
255 * Check for the ancillary data header for sliced VBI
256 */
257 if (anc->preamble[0] ||
258 anc->preamble[1] != 0xff || anc->preamble[2] != 0xff ||
259 (anc->did != sliced_vbi_did[0] &&
260 anc->did != sliced_vbi_did[1])) {
261 vbi->line = vbi->type = 0;
262 return 0;
263 }
264
265 did = anc->did;
266 sdid = anc->sdid & 0xf;
267 l = anc->idid[0] & 0x3f;
268 l += state->slicer_line_offset;
269 p = anc->payload;
270
271 /* Decode the SDID set by the slicer */
272 switch (sdid) {
273 case 1:
274 sdid = V4L2_SLICED_TELETEXT_B;
275 break;
276 case 4:
277 sdid = V4L2_SLICED_WSS_625;
278 break;
279 case 6:
280 sdid = V4L2_SLICED_CAPTION_525;
281 err = !odd_parity(p[0]) || !odd_parity(p[1]);
282 break;
283 case 9:
284 sdid = V4L2_SLICED_VPS;
285 if (decode_vps(p, p) != 0)
286 err = 1;
287 break;
288 default:
289 sdid = 0;
290 err = 1;
291 break;
292 }
293
294 vbi->type = err ? 0 : sdid;
295 vbi->line = err ? 0 : l;
296 vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]);
297 vbi->p = p;
298 return 0;
299 }
300