1 /*
2 * cx18 file operation functions
3 *
4 * Derived from ivtv-fileops.c
5 *
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
7 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 * 02111-1307 USA
23 */
24
25 #include "cx18-driver.h"
26 #include "cx18-fileops.h"
27 #include "cx18-i2c.h"
28 #include "cx18-queue.h"
29 #include "cx18-vbi.h"
30 #include "cx18-audio.h"
31 #include "cx18-mailbox.h"
32 #include "cx18-scb.h"
33 #include "cx18-streams.h"
34 #include "cx18-controls.h"
35 #include "cx18-ioctl.h"
36 #include "cx18-cards.h"
37
38 /* This function tries to claim the stream for a specific file descriptor.
39 If no one else is using this stream then the stream is claimed and
40 associated VBI and IDX streams are also automatically claimed.
41 Possible error returns: -EBUSY if someone else has claimed
42 the stream or 0 on success. */
cx18_claim_stream(struct cx18_open_id * id,int type)43 int cx18_claim_stream(struct cx18_open_id *id, int type)
44 {
45 struct cx18 *cx = id->cx;
46 struct cx18_stream *s = &cx->streams[type];
47 struct cx18_stream *s_assoc;
48
49 /* Nothing should ever try to directly claim the IDX stream */
50 if (type == CX18_ENC_STREAM_TYPE_IDX) {
51 CX18_WARN("MPEG Index stream cannot be claimed "
52 "directly, but something tried.\n");
53 return -EINVAL;
54 }
55
56 if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
57 /* someone already claimed this stream */
58 if (s->id == id->open_id) {
59 /* yes, this file descriptor did. So that's OK. */
60 return 0;
61 }
62 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
63 /* VBI is handled already internally, now also assign
64 the file descriptor to this stream for external
65 reading of the stream. */
66 s->id = id->open_id;
67 CX18_DEBUG_INFO("Start Read VBI\n");
68 return 0;
69 }
70 /* someone else is using this stream already */
71 CX18_DEBUG_INFO("Stream %d is busy\n", type);
72 return -EBUSY;
73 }
74 s->id = id->open_id;
75
76 /*
77 * CX18_ENC_STREAM_TYPE_MPG needs to claim:
78 * CX18_ENC_STREAM_TYPE_VBI, if VBI insertion is on for sliced VBI, or
79 * CX18_ENC_STREAM_TYPE_IDX, if VBI insertion is off for sliced VBI
80 * (We don't yet fix up MPEG Index entries for our inserted packets).
81 *
82 * For all other streams we're done.
83 */
84 if (type != CX18_ENC_STREAM_TYPE_MPG)
85 return 0;
86
87 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
88 if (cx->vbi.insert_mpeg && !cx18_raw_vbi(cx))
89 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
90 else if (!cx18_stream_enabled(s_assoc))
91 return 0;
92
93 set_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
94
95 /* mark that it is used internally */
96 set_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags);
97 return 0;
98 }
99 EXPORT_SYMBOL(cx18_claim_stream);
100
101 /* This function releases a previously claimed stream. It will take into
102 account associated VBI streams. */
cx18_release_stream(struct cx18_stream * s)103 void cx18_release_stream(struct cx18_stream *s)
104 {
105 struct cx18 *cx = s->cx;
106 struct cx18_stream *s_assoc;
107
108 s->id = -1;
109 if (s->type == CX18_ENC_STREAM_TYPE_IDX) {
110 /*
111 * The IDX stream is only used internally, and can
112 * only be indirectly unclaimed by unclaiming the MPG stream.
113 */
114 return;
115 }
116
117 if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
118 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
119 /* this stream is still in use internally */
120 return;
121 }
122 if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
123 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
124 return;
125 }
126
127 cx18_flush_queues(s);
128
129 /*
130 * CX18_ENC_STREAM_TYPE_MPG needs to release the
131 * CX18_ENC_STREAM_TYPE_VBI and/or CX18_ENC_STREAM_TYPE_IDX streams.
132 *
133 * For all other streams we're done.
134 */
135 if (s->type != CX18_ENC_STREAM_TYPE_MPG)
136 return;
137
138 /* Unclaim the associated MPEG Index stream */
139 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
140 if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
141 clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
142 cx18_flush_queues(s_assoc);
143 }
144
145 /* Unclaim the associated VBI stream */
146 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
147 if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
148 if (s_assoc->id == -1) {
149 /*
150 * The VBI stream is not still claimed by a file
151 * descriptor, so completely unclaim it.
152 */
153 clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
154 cx18_flush_queues(s_assoc);
155 }
156 }
157 }
158 EXPORT_SYMBOL(cx18_release_stream);
159
cx18_dualwatch(struct cx18 * cx)160 static void cx18_dualwatch(struct cx18 *cx)
161 {
162 struct v4l2_tuner vt;
163 u32 new_stereo_mode;
164 const u32 dual = 0x0200;
165
166 new_stereo_mode = v4l2_ctrl_g_ctrl(cx->cxhdl.audio_mode);
167 memset(&vt, 0, sizeof(vt));
168 cx18_call_all(cx, tuner, g_tuner, &vt);
169 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
170 (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
171 new_stereo_mode = dual;
172
173 if (new_stereo_mode == cx->dualwatch_stereo_mode)
174 return;
175
176 CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
177 cx->dualwatch_stereo_mode, new_stereo_mode);
178 if (v4l2_ctrl_s_ctrl(cx->cxhdl.audio_mode, new_stereo_mode))
179 CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
180 }
181
182
cx18_get_mdl(struct cx18_stream * s,int non_block,int * err)183 static struct cx18_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
184 int *err)
185 {
186 struct cx18 *cx = s->cx;
187 struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
188 struct cx18_mdl *mdl;
189 DEFINE_WAIT(wait);
190
191 *err = 0;
192 while (1) {
193 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
194 /* Process pending program updates and VBI data */
195 if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
196 cx->dualwatch_jiffies = jiffies;
197 cx18_dualwatch(cx);
198 }
199 if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
200 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
201 while ((mdl = cx18_dequeue(s_vbi,
202 &s_vbi->q_full))) {
203 /* byteswap and process VBI data */
204 cx18_process_vbi_data(cx, mdl,
205 s_vbi->type);
206 cx18_stream_put_mdl_fw(s_vbi, mdl);
207 }
208 }
209 mdl = &cx->vbi.sliced_mpeg_mdl;
210 if (mdl->readpos != mdl->bytesused)
211 return mdl;
212 }
213
214 /* do we have new data? */
215 mdl = cx18_dequeue(s, &s->q_full);
216 if (mdl) {
217 if (!test_and_clear_bit(CX18_F_M_NEED_SWAP,
218 &mdl->m_flags))
219 return mdl;
220 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
221 /* byteswap MPG data */
222 cx18_mdl_swap(mdl);
223 else {
224 /* byteswap and process VBI data */
225 cx18_process_vbi_data(cx, mdl, s->type);
226 }
227 return mdl;
228 }
229
230 /* return if end of stream */
231 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
232 CX18_DEBUG_INFO("EOS %s\n", s->name);
233 return NULL;
234 }
235
236 /* return if file was opened with O_NONBLOCK */
237 if (non_block) {
238 *err = -EAGAIN;
239 return NULL;
240 }
241
242 /* wait for more data to arrive */
243 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
244 /* New buffers might have become available before we were added
245 to the waitqueue */
246 if (!atomic_read(&s->q_full.depth))
247 schedule();
248 finish_wait(&s->waitq, &wait);
249 if (signal_pending(current)) {
250 /* return if a signal was received */
251 CX18_DEBUG_INFO("User stopped %s\n", s->name);
252 *err = -EINTR;
253 return NULL;
254 }
255 }
256 }
257
cx18_setup_sliced_vbi_mdl(struct cx18 * cx)258 static void cx18_setup_sliced_vbi_mdl(struct cx18 *cx)
259 {
260 struct cx18_mdl *mdl = &cx->vbi.sliced_mpeg_mdl;
261 struct cx18_buffer *buf = &cx->vbi.sliced_mpeg_buf;
262 int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
263
264 buf->buf = cx->vbi.sliced_mpeg_data[idx];
265 buf->bytesused = cx->vbi.sliced_mpeg_size[idx];
266 buf->readpos = 0;
267
268 mdl->curr_buf = NULL;
269 mdl->bytesused = cx->vbi.sliced_mpeg_size[idx];
270 mdl->readpos = 0;
271 }
272
cx18_copy_buf_to_user(struct cx18_stream * s,struct cx18_buffer * buf,char __user * ubuf,size_t ucount,bool * stop)273 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
274 struct cx18_buffer *buf, char __user *ubuf, size_t ucount, bool *stop)
275 {
276 struct cx18 *cx = s->cx;
277 size_t len = buf->bytesused - buf->readpos;
278
279 *stop = false;
280 if (len > ucount)
281 len = ucount;
282 if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
283 !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
284 /*
285 * Try to find a good splice point in the PS, just before
286 * an MPEG-2 Program Pack start code, and provide only
287 * up to that point to the user, so it's easy to insert VBI data
288 * the next time around.
289 *
290 * This will not work for an MPEG-2 TS and has only been
291 * verified by analysis to work for an MPEG-2 PS. Helen Buus
292 * pointed out this works for the CX23416 MPEG-2 DVD compatible
293 * stream, and research indicates both the MPEG 2 SVCD and DVD
294 * stream types use an MPEG-2 PS container.
295 */
296 /*
297 * An MPEG-2 Program Stream (PS) is a series of
298 * MPEG-2 Program Packs terminated by an
299 * MPEG Program End Code after the last Program Pack.
300 * A Program Pack may hold a PS System Header packet and any
301 * number of Program Elementary Stream (PES) Packets
302 */
303 const char *start = buf->buf + buf->readpos;
304 const char *p = start + 1;
305 const u8 *q;
306 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
307 int stuffing, i;
308
309 while (start + len > p) {
310 /* Scan for a 0 to find a potential MPEG-2 start code */
311 q = memchr(p, 0, start + len - p);
312 if (q == NULL)
313 break;
314 p = q + 1;
315 /*
316 * Keep looking if not a
317 * MPEG-2 Pack header start code: 0x00 0x00 0x01 0xba
318 * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
319 */
320 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
321 q[1] != 0 || q[2] != 1 || q[3] != ch)
322 continue;
323
324 /* If expecting the primary video PES */
325 if (!cx->search_pack_header) {
326 /* Continue if it couldn't be a PES packet */
327 if ((q[6] & 0xc0) != 0x80)
328 continue;
329 /* Check if a PTS or PTS & DTS follow */
330 if (((q[7] & 0xc0) == 0x80 && /* PTS only */
331 (q[9] & 0xf0) == 0x20) || /* PTS only */
332 ((q[7] & 0xc0) == 0xc0 && /* PTS & DTS */
333 (q[9] & 0xf0) == 0x30)) { /* DTS follows */
334 /* Assume we found the video PES hdr */
335 ch = 0xba; /* next want a Program Pack*/
336 cx->search_pack_header = 1;
337 p = q + 9; /* Skip this video PES hdr */
338 }
339 continue;
340 }
341
342 /* We may have found a Program Pack start code */
343
344 /* Get the count of stuffing bytes & verify them */
345 stuffing = q[13] & 7;
346 /* all stuffing bytes must be 0xff */
347 for (i = 0; i < stuffing; i++)
348 if (q[14 + i] != 0xff)
349 break;
350 if (i == stuffing && /* right number of stuffing bytes*/
351 (q[4] & 0xc4) == 0x44 && /* marker check */
352 (q[12] & 3) == 3 && /* marker check */
353 q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
354 q[15 + stuffing] == 0 &&
355 q[16 + stuffing] == 1) {
356 /* We declare we actually found a Program Pack*/
357 cx->search_pack_header = 0; /* expect vid PES */
358 len = (char *)q - start;
359 cx18_setup_sliced_vbi_mdl(cx);
360 *stop = true;
361 break;
362 }
363 }
364 }
365 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
366 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
367 len, s->name);
368 return -EFAULT;
369 }
370 buf->readpos += len;
371 if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
372 buf != &cx->vbi.sliced_mpeg_buf)
373 cx->mpg_data_received += len;
374 return len;
375 }
376
cx18_copy_mdl_to_user(struct cx18_stream * s,struct cx18_mdl * mdl,char __user * ubuf,size_t ucount)377 static size_t cx18_copy_mdl_to_user(struct cx18_stream *s,
378 struct cx18_mdl *mdl, char __user *ubuf, size_t ucount)
379 {
380 size_t tot_written = 0;
381 int rc;
382 bool stop = false;
383
384 if (mdl->curr_buf == NULL)
385 mdl->curr_buf = list_first_entry(&mdl->buf_list,
386 struct cx18_buffer, list);
387
388 if (list_entry_is_past_end(mdl->curr_buf, &mdl->buf_list, list)) {
389 /*
390 * For some reason we've exhausted the buffers, but the MDL
391 * object still said some data was unread.
392 * Fix that and bail out.
393 */
394 mdl->readpos = mdl->bytesused;
395 return 0;
396 }
397
398 list_for_each_entry_from(mdl->curr_buf, &mdl->buf_list, list) {
399
400 if (mdl->curr_buf->readpos >= mdl->curr_buf->bytesused)
401 continue;
402
403 rc = cx18_copy_buf_to_user(s, mdl->curr_buf, ubuf + tot_written,
404 ucount - tot_written, &stop);
405 if (rc < 0)
406 return rc;
407 mdl->readpos += rc;
408 tot_written += rc;
409
410 if (stop || /* Forced stopping point for VBI insertion */
411 tot_written >= ucount || /* Reader request statisfied */
412 mdl->curr_buf->readpos < mdl->curr_buf->bytesused ||
413 mdl->readpos >= mdl->bytesused) /* MDL buffers drained */
414 break;
415 }
416 return tot_written;
417 }
418
cx18_read(struct cx18_stream * s,char __user * ubuf,size_t tot_count,int non_block)419 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
420 size_t tot_count, int non_block)
421 {
422 struct cx18 *cx = s->cx;
423 size_t tot_written = 0;
424 int single_frame = 0;
425
426 if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
427 /* shouldn't happen */
428 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
429 s->name);
430 return -EIO;
431 }
432
433 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
434 frames should arrive one-by-one, so make sure we never output more
435 than one VBI frame at a time */
436 if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
437 single_frame = 1;
438
439 for (;;) {
440 struct cx18_mdl *mdl;
441 int rc;
442
443 mdl = cx18_get_mdl(s, non_block, &rc);
444 /* if there is no data available... */
445 if (mdl == NULL) {
446 /* if we got data, then return that regardless */
447 if (tot_written)
448 break;
449 /* EOS condition */
450 if (rc == 0) {
451 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
452 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
453 cx18_release_stream(s);
454 }
455 /* set errno */
456 return rc;
457 }
458
459 rc = cx18_copy_mdl_to_user(s, mdl, ubuf + tot_written,
460 tot_count - tot_written);
461
462 if (mdl != &cx->vbi.sliced_mpeg_mdl) {
463 if (mdl->readpos == mdl->bytesused)
464 cx18_stream_put_mdl_fw(s, mdl);
465 else
466 cx18_push(s, mdl, &s->q_full);
467 } else if (mdl->readpos == mdl->bytesused) {
468 int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
469
470 cx->vbi.sliced_mpeg_size[idx] = 0;
471 cx->vbi.inserted_frame++;
472 cx->vbi_data_inserted += mdl->bytesused;
473 }
474 if (rc < 0)
475 return rc;
476 tot_written += rc;
477
478 if (tot_written == tot_count || single_frame)
479 break;
480 }
481 return tot_written;
482 }
483
cx18_read_pos(struct cx18_stream * s,char __user * ubuf,size_t count,loff_t * pos,int non_block)484 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
485 size_t count, loff_t *pos, int non_block)
486 {
487 ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
488 struct cx18 *cx = s->cx;
489
490 CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
491 if (rc > 0)
492 pos += rc;
493 return rc;
494 }
495
cx18_start_capture(struct cx18_open_id * id)496 int cx18_start_capture(struct cx18_open_id *id)
497 {
498 struct cx18 *cx = id->cx;
499 struct cx18_stream *s = &cx->streams[id->type];
500 struct cx18_stream *s_vbi;
501 struct cx18_stream *s_idx;
502
503 if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
504 /* you cannot read from these stream types. */
505 return -EPERM;
506 }
507
508 /* Try to claim this stream. */
509 if (cx18_claim_stream(id, s->type))
510 return -EBUSY;
511
512 /* If capture is already in progress, then we also have to
513 do nothing extra. */
514 if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
515 test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
516 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
517 return 0;
518 }
519
520 /* Start associated VBI or IDX stream capture if required */
521 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
522 s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
523 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
524 /*
525 * The VBI and IDX streams should have been claimed
526 * automatically, if for internal use, when the MPG stream was
527 * claimed. We only need to start these streams capturing.
528 */
529 if (test_bit(CX18_F_S_INTERNAL_USE, &s_idx->s_flags) &&
530 !test_and_set_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
531 if (cx18_start_v4l2_encode_stream(s_idx)) {
532 CX18_DEBUG_WARN("IDX capture start failed\n");
533 clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
534 goto start_failed;
535 }
536 CX18_DEBUG_INFO("IDX capture started\n");
537 }
538 if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
539 !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
540 if (cx18_start_v4l2_encode_stream(s_vbi)) {
541 CX18_DEBUG_WARN("VBI capture start failed\n");
542 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
543 goto start_failed;
544 }
545 CX18_DEBUG_INFO("VBI insertion started\n");
546 }
547 }
548
549 /* Tell the card to start capturing */
550 if (!cx18_start_v4l2_encode_stream(s)) {
551 /* We're done */
552 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
553 /* Resume a possibly paused encoder */
554 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
555 cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
556 return 0;
557 }
558
559 start_failed:
560 CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
561
562 /*
563 * The associated VBI and IDX streams for internal use are released
564 * automatically when the MPG stream is released. We only need to stop
565 * the associated stream.
566 */
567 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
568 /* Stop the IDX stream which is always for internal use */
569 if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
570 cx18_stop_v4l2_encode_stream(s_idx, 0);
571 clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
572 }
573 /* Stop the VBI stream, if only running for internal use */
574 if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
575 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
576 cx18_stop_v4l2_encode_stream(s_vbi, 0);
577 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
578 }
579 }
580 clear_bit(CX18_F_S_STREAMING, &s->s_flags);
581 cx18_release_stream(s); /* Also releases associated streams */
582 return -EIO;
583 }
584
cx18_v4l2_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)585 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
586 loff_t *pos)
587 {
588 struct cx18_open_id *id = file2id(filp);
589 struct cx18 *cx = id->cx;
590 struct cx18_stream *s = &cx->streams[id->type];
591 int rc;
592
593 CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
594
595 mutex_lock(&cx->serialize_lock);
596 rc = cx18_start_capture(id);
597 mutex_unlock(&cx->serialize_lock);
598 if (rc)
599 return rc;
600 return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
601 }
602
cx18_v4l2_enc_poll(struct file * filp,poll_table * wait)603 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
604 {
605 struct cx18_open_id *id = file2id(filp);
606 struct cx18 *cx = id->cx;
607 struct cx18_stream *s = &cx->streams[id->type];
608 int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
609
610 /* Start a capture if there is none */
611 if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
612 int rc;
613
614 mutex_lock(&cx->serialize_lock);
615 rc = cx18_start_capture(id);
616 mutex_unlock(&cx->serialize_lock);
617 if (rc) {
618 CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
619 s->name, rc);
620 return POLLERR;
621 }
622 CX18_DEBUG_FILE("Encoder poll started capture\n");
623 }
624
625 /* add stream's waitq to the poll list */
626 CX18_DEBUG_HI_FILE("Encoder poll\n");
627 poll_wait(filp, &s->waitq, wait);
628
629 if (atomic_read(&s->q_full.depth))
630 return POLLIN | POLLRDNORM;
631 if (eof)
632 return POLLHUP;
633 return 0;
634 }
635
cx18_stop_capture(struct cx18_open_id * id,int gop_end)636 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
637 {
638 struct cx18 *cx = id->cx;
639 struct cx18_stream *s = &cx->streams[id->type];
640 struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
641 struct cx18_stream *s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
642
643 CX18_DEBUG_IOCTL("close() of %s\n", s->name);
644
645 /* 'Unclaim' this stream */
646
647 /* Stop capturing */
648 if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
649 CX18_DEBUG_INFO("close stopping capture\n");
650 if (id->type == CX18_ENC_STREAM_TYPE_MPG) {
651 /* Stop internal use associated VBI and IDX streams */
652 if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
653 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
654 CX18_DEBUG_INFO("close stopping embedded VBI "
655 "capture\n");
656 cx18_stop_v4l2_encode_stream(s_vbi, 0);
657 }
658 if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
659 CX18_DEBUG_INFO("close stopping IDX capture\n");
660 cx18_stop_v4l2_encode_stream(s_idx, 0);
661 }
662 }
663 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
664 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
665 /* Also used internally, don't stop capturing */
666 s->id = -1;
667 else
668 cx18_stop_v4l2_encode_stream(s, gop_end);
669 }
670 if (!gop_end) {
671 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
672 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
673 cx18_release_stream(s);
674 }
675 }
676
cx18_v4l2_close(struct file * filp)677 int cx18_v4l2_close(struct file *filp)
678 {
679 struct v4l2_fh *fh = filp->private_data;
680 struct cx18_open_id *id = fh2id(fh);
681 struct cx18 *cx = id->cx;
682 struct cx18_stream *s = &cx->streams[id->type];
683
684 CX18_DEBUG_IOCTL("close() of %s\n", s->name);
685
686 v4l2_fh_del(fh);
687 v4l2_fh_exit(fh);
688
689 /* Easy case first: this stream was never claimed by us */
690 if (s->id != id->open_id) {
691 kfree(id);
692 return 0;
693 }
694
695 /* 'Unclaim' this stream */
696
697 /* Stop radio */
698 mutex_lock(&cx->serialize_lock);
699 if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
700 /* Closing radio device, return to TV mode */
701 cx18_mute(cx);
702 /* Mark that the radio is no longer in use */
703 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
704 /* Switch tuner to TV */
705 cx18_call_all(cx, core, s_std, cx->std);
706 /* Select correct audio input (i.e. TV tuner or Line in) */
707 cx18_audio_set_io(cx);
708 if (atomic_read(&cx->ana_capturing) > 0) {
709 /* Undo video mute */
710 cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
711 (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute) |
712 (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute_yuv) << 8)));
713 }
714 /* Done! Unmute and continue. */
715 cx18_unmute(cx);
716 cx18_release_stream(s);
717 } else {
718 cx18_stop_capture(id, 0);
719 }
720 kfree(id);
721 mutex_unlock(&cx->serialize_lock);
722 return 0;
723 }
724
cx18_serialized_open(struct cx18_stream * s,struct file * filp)725 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
726 {
727 struct cx18 *cx = s->cx;
728 struct cx18_open_id *item;
729
730 CX18_DEBUG_FILE("open %s\n", s->name);
731
732 /* Allocate memory */
733 item = kzalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
734 if (NULL == item) {
735 CX18_DEBUG_WARN("nomem on v4l2 open\n");
736 return -ENOMEM;
737 }
738 v4l2_fh_init(&item->fh, s->video_dev);
739
740 item->cx = cx;
741 item->type = s->type;
742
743 item->open_id = cx->open_id++;
744 filp->private_data = &item->fh;
745
746 if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
747 /* Try to claim this stream */
748 if (cx18_claim_stream(item, item->type)) {
749 /* No, it's already in use */
750 v4l2_fh_exit(&item->fh);
751 kfree(item);
752 return -EBUSY;
753 }
754
755 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
756 if (atomic_read(&cx->ana_capturing) > 0) {
757 /* switching to radio while capture is
758 in progress is not polite */
759 cx18_release_stream(s);
760 v4l2_fh_exit(&item->fh);
761 kfree(item);
762 return -EBUSY;
763 }
764 }
765
766 /* Mark that the radio is being used. */
767 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
768 /* We have the radio */
769 cx18_mute(cx);
770 /* Switch tuner to radio */
771 cx18_call_all(cx, tuner, s_radio);
772 /* Select the correct audio input (i.e. radio tuner) */
773 cx18_audio_set_io(cx);
774 /* Done! Unmute and continue. */
775 cx18_unmute(cx);
776 }
777 v4l2_fh_add(&item->fh);
778 return 0;
779 }
780
cx18_v4l2_open(struct file * filp)781 int cx18_v4l2_open(struct file *filp)
782 {
783 int res;
784 struct video_device *video_dev = video_devdata(filp);
785 struct cx18_stream *s = video_get_drvdata(video_dev);
786 struct cx18 *cx = s->cx;
787
788 mutex_lock(&cx->serialize_lock);
789 if (cx18_init_on_first_open(cx)) {
790 CX18_ERR("Failed to initialize on %s\n",
791 video_device_node_name(video_dev));
792 mutex_unlock(&cx->serialize_lock);
793 return -ENXIO;
794 }
795 res = cx18_serialized_open(s, filp);
796 mutex_unlock(&cx->serialize_lock);
797 return res;
798 }
799
cx18_mute(struct cx18 * cx)800 void cx18_mute(struct cx18 *cx)
801 {
802 u32 h;
803 if (atomic_read(&cx->ana_capturing)) {
804 h = cx18_find_handle(cx);
805 if (h != CX18_INVALID_TASK_HANDLE)
806 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
807 else
808 CX18_ERR("Can't find valid task handle for mute\n");
809 }
810 CX18_DEBUG_INFO("Mute\n");
811 }
812
cx18_unmute(struct cx18 * cx)813 void cx18_unmute(struct cx18 *cx)
814 {
815 u32 h;
816 if (atomic_read(&cx->ana_capturing)) {
817 h = cx18_find_handle(cx);
818 if (h != CX18_INVALID_TASK_HANDLE) {
819 cx18_msleep_timeout(100, 0);
820 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
821 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
822 } else
823 CX18_ERR("Can't find valid task handle for unmute\n");
824 }
825 CX18_DEBUG_INFO("Unmute\n");
826 }
827