2 * cx18 ADEC VBI functions
4 * Derived from cx25840-vbi.c
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "cx18-driver.h"
28 * For sliced VBI output, we set up to use VIP-1.1, 8-bit mode,
29 * NN counts 1 byte Dwords, an IDID with the VBI line # in it.
30 * Thus, according to the VIP-2 Spec, our VBI ancillary data lines
31 * (should!) look like:
32 * 4 byte EAV code: 0xff 0x00 0x00 0xRP
33 * unknown number of possible idle bytes
34 * 3 byte Anc data preamble: 0x00 0xff 0xff
35 * 1 byte data identifier: ne010iii (parity bits, 010, DID bits)
36 * 1 byte secondary data id: nessssss (parity bits, SDID bits)
37 * 1 byte data word count: necccccc (parity bits, NN Dword count)
38 * 2 byte Internal DID: VBI-line-# 0x80
41 * Fill bytes needed to fil out to 4*NN bytes of payload
43 * The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, &
44 * in the vertical blanking interval are:
45 * 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0)
46 * 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0)
48 * Since the V bit is only allowed to toggle in the EAV RP code, just
49 * before the first active region line and for active lines, they are:
50 * 0x90 (Task 0 0 HorizontalBlank 0 0 0 0)
51 * 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0)
53 * The user application DID bytes we care about are:
54 * 0x91 (1 0 010 0 !ActiveLine AncDataPresent)
55 * 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent)
58 static const u8 sliced_vbi_did[2] = { 0x91, 0x55 };
62 /* u8 idle[]; Variable number of idle bytes */
68 u8 payload[1]; /* data_count of payload */
70 /* u8 fill[]; Variable number of fill bytes */
73 static int odd_parity(u8 c)
82 static int decode_vps(u8 *dst, u8 *p)
84 static const u8 biphase_tbl[] = {
85 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
86 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
87 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
88 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
89 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
90 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
91 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
92 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
93 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
94 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
95 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
96 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
97 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
98 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
99 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
100 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
101 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
102 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
103 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
104 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
105 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
106 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
107 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
108 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
109 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
110 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
111 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
112 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
113 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
114 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
115 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
116 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
122 for (i = 0; i < 2 * 13; i += 2) {
123 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
124 c = (biphase_tbl[p[i + 1]] & 0xf) |
125 ((biphase_tbl[p[i]] & 0xf) << 4);
132 int cx18_av_vbi_g_fmt(struct cx18 *cx, struct v4l2_format *fmt)
134 struct cx18_av_state *state = &cx->av_state;
135 struct v4l2_sliced_vbi_format *svbi;
136 static const u16 lcr2vbi[] = {
137 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
138 0, V4L2_SLICED_WSS_625, 0, /* 4 */
139 V4L2_SLICED_CAPTION_525, /* 6 */
140 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
143 int is_pal = !(state->std & V4L2_STD_525_60);
146 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
148 svbi = &fmt->fmt.sliced;
149 memset(svbi, 0, sizeof(*svbi));
150 /* we're done if raw VBI is active */
151 if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
155 for (i = 7; i <= 23; i++) {
156 u8 v = cx18_av_read(cx, 0x424 + i - 7);
158 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
159 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
160 svbi->service_set |= svbi->service_lines[0][i] |
161 svbi->service_lines[1][i];
164 for (i = 10; i <= 21; i++) {
165 u8 v = cx18_av_read(cx, 0x424 + i - 10);
167 svbi->service_lines[0][i] = lcr2vbi[v >> 4];
168 svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
169 svbi->service_set |= svbi->service_lines[0][i] |
170 svbi->service_lines[1][i];
176 int cx18_av_vbi_s_fmt(struct cx18 *cx, struct v4l2_format *fmt)
178 struct cx18_av_state *state = &cx->av_state;
179 struct v4l2_sliced_vbi_format *svbi;
180 int is_pal = !(state->std & V4L2_STD_525_60);
184 if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE &&
185 fmt->type != V4L2_BUF_TYPE_VBI_CAPTURE)
187 svbi = &fmt->fmt.sliced;
188 if (fmt->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
190 memset(svbi, 0, sizeof(*svbi));
193 cx18_av_std_setup(cx);
196 cx18_av_write(cx, 0x47f, state->slicer_line_delay);
197 cx18_av_write(cx, 0x404, 0x2e);
201 for (x = 0; x <= 23; x++)
205 cx18_av_std_setup(cx);
208 cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */
209 cx18_av_write(cx, 0x406, 0x13);
210 cx18_av_write(cx, 0x47f, state->slicer_line_delay);
212 /* Force impossible lines to 0 */
214 for (i = 0; i <= 6; i++)
215 svbi->service_lines[0][i] =
216 svbi->service_lines[1][i] = 0;
218 for (i = 0; i <= 9; i++)
219 svbi->service_lines[0][i] =
220 svbi->service_lines[1][i] = 0;
222 for (i = 22; i <= 23; i++)
223 svbi->service_lines[0][i] =
224 svbi->service_lines[1][i] = 0;
227 /* Build register values for requested service lines */
228 for (i = 7; i <= 23; i++) {
229 for (x = 0; x <= 1; x++) {
230 switch (svbi->service_lines[1-x][i]) {
231 case V4L2_SLICED_TELETEXT_B:
232 lcr[i] |= 1 << (4 * x);
234 case V4L2_SLICED_WSS_625:
235 lcr[i] |= 4 << (4 * x);
237 case V4L2_SLICED_CAPTION_525:
238 lcr[i] |= 6 << (4 * x);
240 case V4L2_SLICED_VPS:
241 lcr[i] |= 9 << (4 * x);
248 for (x = 1, i = 0x424; i <= 0x434; i++, x++)
249 cx18_av_write(cx, i, lcr[6 + x]);
251 for (x = 1, i = 0x424; i <= 0x430; i++, x++)
252 cx18_av_write(cx, i, lcr[9 + x]);
253 for (i = 0x431; i <= 0x434; i++)
254 cx18_av_write(cx, i, 0);
257 cx18_av_write(cx, 0x43c, 0x16);
258 /* FIXME - should match vblank set in cx18_av_std_setup() */
259 cx18_av_write(cx, 0x474, is_pal ? 0x2a : 26);
263 int cx18_av_decode_vbi_line(struct v4l2_subdev *sd,
264 struct v4l2_decode_vbi_line *vbi)
266 struct cx18 *cx = v4l2_get_subdevdata(sd);
267 struct cx18_av_state *state = &cx->av_state;
268 struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p;
270 int did, sdid, l, err = 0;
273 * Check for the ancillary data header for sliced VBI
275 if (anc->preamble[0] ||
276 anc->preamble[1] != 0xff || anc->preamble[2] != 0xff ||
277 (anc->did != sliced_vbi_did[0] &&
278 anc->did != sliced_vbi_did[1])) {
279 vbi->line = vbi->type = 0;
284 sdid = anc->sdid & 0xf;
285 l = anc->idid[0] & 0x3f;
286 l += state->slicer_line_offset;
289 /* Decode the SDID set by the slicer */
292 sdid = V4L2_SLICED_TELETEXT_B;
295 sdid = V4L2_SLICED_WSS_625;
298 sdid = V4L2_SLICED_CAPTION_525;
299 err = !odd_parity(p[0]) || !odd_parity(p[1]);
302 sdid = V4L2_SLICED_VPS;
303 if (decode_vps(p, p) != 0)
312 vbi->type = err ? 0 : sdid;
313 vbi->line = err ? 0 : l;
314 vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]);