1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * cx18 file operation functions
4 *
5 * Derived from ivtv-fileops.c
6 *
7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
9 */
10
11 #include "cx18-driver.h"
12 #include "cx18-fileops.h"
13 #include "cx18-i2c.h"
14 #include "cx18-queue.h"
15 #include "cx18-vbi.h"
16 #include "cx18-audio.h"
17 #include "cx18-mailbox.h"
18 #include "cx18-scb.h"
19 #include "cx18-streams.h"
20 #include "cx18-controls.h"
21 #include "cx18-ioctl.h"
22 #include "cx18-cards.h"
23 #include <media/v4l2-event.h>
24
25 /* This function tries to claim the stream for a specific file descriptor.
26 If no one else is using this stream then the stream is claimed and
27 associated VBI and IDX streams are also automatically claimed.
28 Possible error returns: -EBUSY if someone else has claimed
29 the stream or 0 on success. */
cx18_claim_stream(struct cx18_open_id * id,int type)30 int cx18_claim_stream(struct cx18_open_id *id, int type)
31 {
32 struct cx18 *cx = id->cx;
33 struct cx18_stream *s = &cx->streams[type];
34 struct cx18_stream *s_assoc;
35
36 /* Nothing should ever try to directly claim the IDX stream */
37 if (type == CX18_ENC_STREAM_TYPE_IDX) {
38 CX18_WARN("MPEG Index stream cannot be claimed directly, but something tried.\n");
39 return -EINVAL;
40 }
41
42 if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
43 /* someone already claimed this stream */
44 if (s->id == id->open_id) {
45 /* yes, this file descriptor did. So that's OK. */
46 return 0;
47 }
48 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
49 /* VBI is handled already internally, now also assign
50 the file descriptor to this stream for external
51 reading of the stream. */
52 s->id = id->open_id;
53 CX18_DEBUG_INFO("Start Read VBI\n");
54 return 0;
55 }
56 /* someone else is using this stream already */
57 CX18_DEBUG_INFO("Stream %d is busy\n", type);
58 return -EBUSY;
59 }
60 s->id = id->open_id;
61
62 /*
63 * CX18_ENC_STREAM_TYPE_MPG needs to claim:
64 * CX18_ENC_STREAM_TYPE_VBI, if VBI insertion is on for sliced VBI, or
65 * CX18_ENC_STREAM_TYPE_IDX, if VBI insertion is off for sliced VBI
66 * (We don't yet fix up MPEG Index entries for our inserted packets).
67 *
68 * For all other streams we're done.
69 */
70 if (type != CX18_ENC_STREAM_TYPE_MPG)
71 return 0;
72
73 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
74 if (cx->vbi.insert_mpeg && !cx18_raw_vbi(cx))
75 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
76 else if (!cx18_stream_enabled(s_assoc))
77 return 0;
78
79 set_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
80
81 /* mark that it is used internally */
82 set_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags);
83 return 0;
84 }
85 EXPORT_SYMBOL(cx18_claim_stream);
86
87 /* This function releases a previously claimed stream. It will take into
88 account associated VBI streams. */
cx18_release_stream(struct cx18_stream * s)89 void cx18_release_stream(struct cx18_stream *s)
90 {
91 struct cx18 *cx = s->cx;
92 struct cx18_stream *s_assoc;
93
94 s->id = -1;
95 if (s->type == CX18_ENC_STREAM_TYPE_IDX) {
96 /*
97 * The IDX stream is only used internally, and can
98 * only be indirectly unclaimed by unclaiming the MPG stream.
99 */
100 return;
101 }
102
103 if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
104 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
105 /* this stream is still in use internally */
106 return;
107 }
108 if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
109 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
110 return;
111 }
112
113 cx18_flush_queues(s);
114
115 /*
116 * CX18_ENC_STREAM_TYPE_MPG needs to release the
117 * CX18_ENC_STREAM_TYPE_VBI and/or CX18_ENC_STREAM_TYPE_IDX streams.
118 *
119 * For all other streams we're done.
120 */
121 if (s->type != CX18_ENC_STREAM_TYPE_MPG)
122 return;
123
124 /* Unclaim the associated MPEG Index stream */
125 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
126 if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
127 clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
128 cx18_flush_queues(s_assoc);
129 }
130
131 /* Unclaim the associated VBI stream */
132 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
133 if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
134 if (s_assoc->id == -1) {
135 /*
136 * The VBI stream is not still claimed by a file
137 * descriptor, so completely unclaim it.
138 */
139 clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
140 cx18_flush_queues(s_assoc);
141 }
142 }
143 }
144 EXPORT_SYMBOL(cx18_release_stream);
145
cx18_dualwatch(struct cx18 * cx)146 static void cx18_dualwatch(struct cx18 *cx)
147 {
148 struct v4l2_tuner vt;
149 u32 new_stereo_mode;
150 const u32 dual = 0x0200;
151
152 new_stereo_mode = v4l2_ctrl_g_ctrl(cx->cxhdl.audio_mode);
153 memset(&vt, 0, sizeof(vt));
154 cx18_call_all(cx, tuner, g_tuner, &vt);
155 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
156 (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
157 new_stereo_mode = dual;
158
159 if (new_stereo_mode == cx->dualwatch_stereo_mode)
160 return;
161
162 CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
163 cx->dualwatch_stereo_mode, new_stereo_mode);
164 if (v4l2_ctrl_s_ctrl(cx->cxhdl.audio_mode, new_stereo_mode))
165 CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
166 }
167
168
cx18_get_mdl(struct cx18_stream * s,int non_block,int * err)169 static struct cx18_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
170 int *err)
171 {
172 struct cx18 *cx = s->cx;
173 struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
174 struct cx18_mdl *mdl;
175 DEFINE_WAIT(wait);
176
177 *err = 0;
178 while (1) {
179 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
180 /* Process pending program updates and VBI data */
181 if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
182 cx->dualwatch_jiffies = jiffies;
183 cx18_dualwatch(cx);
184 }
185 if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
186 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
187 while ((mdl = cx18_dequeue(s_vbi,
188 &s_vbi->q_full))) {
189 /* byteswap and process VBI data */
190 cx18_process_vbi_data(cx, mdl,
191 s_vbi->type);
192 cx18_stream_put_mdl_fw(s_vbi, mdl);
193 }
194 }
195 mdl = &cx->vbi.sliced_mpeg_mdl;
196 if (mdl->readpos != mdl->bytesused)
197 return mdl;
198 }
199
200 /* do we have new data? */
201 mdl = cx18_dequeue(s, &s->q_full);
202 if (mdl) {
203 if (!test_and_clear_bit(CX18_F_M_NEED_SWAP,
204 &mdl->m_flags))
205 return mdl;
206 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
207 /* byteswap MPG data */
208 cx18_mdl_swap(mdl);
209 else {
210 /* byteswap and process VBI data */
211 cx18_process_vbi_data(cx, mdl, s->type);
212 }
213 return mdl;
214 }
215
216 /* return if end of stream */
217 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
218 CX18_DEBUG_INFO("EOS %s\n", s->name);
219 return NULL;
220 }
221
222 /* return if file was opened with O_NONBLOCK */
223 if (non_block) {
224 *err = -EAGAIN;
225 return NULL;
226 }
227
228 /* wait for more data to arrive */
229 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
230 /* New buffers might have become available before we were added
231 to the waitqueue */
232 if (!atomic_read(&s->q_full.depth))
233 schedule();
234 finish_wait(&s->waitq, &wait);
235 if (signal_pending(current)) {
236 /* return if a signal was received */
237 CX18_DEBUG_INFO("User stopped %s\n", s->name);
238 *err = -EINTR;
239 return NULL;
240 }
241 }
242 }
243
cx18_setup_sliced_vbi_mdl(struct cx18 * cx)244 static void cx18_setup_sliced_vbi_mdl(struct cx18 *cx)
245 {
246 struct cx18_mdl *mdl = &cx->vbi.sliced_mpeg_mdl;
247 struct cx18_buffer *buf = &cx->vbi.sliced_mpeg_buf;
248 int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
249
250 buf->buf = cx->vbi.sliced_mpeg_data[idx];
251 buf->bytesused = cx->vbi.sliced_mpeg_size[idx];
252 buf->readpos = 0;
253
254 mdl->curr_buf = NULL;
255 mdl->bytesused = cx->vbi.sliced_mpeg_size[idx];
256 mdl->readpos = 0;
257 }
258
cx18_copy_buf_to_user(struct cx18_stream * s,struct cx18_buffer * buf,char __user * ubuf,size_t ucount,bool * stop)259 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
260 struct cx18_buffer *buf, char __user *ubuf, size_t ucount, bool *stop)
261 {
262 struct cx18 *cx = s->cx;
263 size_t len = buf->bytesused - buf->readpos;
264
265 *stop = false;
266 if (len > ucount)
267 len = ucount;
268 if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
269 !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
270 /*
271 * Try to find a good splice point in the PS, just before
272 * an MPEG-2 Program Pack start code, and provide only
273 * up to that point to the user, so it's easy to insert VBI data
274 * the next time around.
275 *
276 * This will not work for an MPEG-2 TS and has only been
277 * verified by analysis to work for an MPEG-2 PS. Helen Buus
278 * pointed out this works for the CX23416 MPEG-2 DVD compatible
279 * stream, and research indicates both the MPEG 2 SVCD and DVD
280 * stream types use an MPEG-2 PS container.
281 */
282 /*
283 * An MPEG-2 Program Stream (PS) is a series of
284 * MPEG-2 Program Packs terminated by an
285 * MPEG Program End Code after the last Program Pack.
286 * A Program Pack may hold a PS System Header packet and any
287 * number of Program Elementary Stream (PES) Packets
288 */
289 const char *start = buf->buf + buf->readpos;
290 const char *p = start + 1;
291 const u8 *q;
292 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
293 int stuffing, i;
294
295 while (start + len > p) {
296 /* Scan for a 0 to find a potential MPEG-2 start code */
297 q = memchr(p, 0, start + len - p);
298 if (q == NULL)
299 break;
300 p = q + 1;
301 /*
302 * Keep looking if not a
303 * MPEG-2 Pack header start code: 0x00 0x00 0x01 0xba
304 * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
305 */
306 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
307 q[1] != 0 || q[2] != 1 || q[3] != ch)
308 continue;
309
310 /* If expecting the primary video PES */
311 if (!cx->search_pack_header) {
312 /* Continue if it couldn't be a PES packet */
313 if ((q[6] & 0xc0) != 0x80)
314 continue;
315 /* Check if a PTS or PTS & DTS follow */
316 if (((q[7] & 0xc0) == 0x80 && /* PTS only */
317 (q[9] & 0xf0) == 0x20) || /* PTS only */
318 ((q[7] & 0xc0) == 0xc0 && /* PTS & DTS */
319 (q[9] & 0xf0) == 0x30)) { /* DTS follows */
320 /* Assume we found the video PES hdr */
321 ch = 0xba; /* next want a Program Pack*/
322 cx->search_pack_header = 1;
323 p = q + 9; /* Skip this video PES hdr */
324 }
325 continue;
326 }
327
328 /* We may have found a Program Pack start code */
329
330 /* Get the count of stuffing bytes & verify them */
331 stuffing = q[13] & 7;
332 /* all stuffing bytes must be 0xff */
333 for (i = 0; i < stuffing; i++)
334 if (q[14 + i] != 0xff)
335 break;
336 if (i == stuffing && /* right number of stuffing bytes*/
337 (q[4] & 0xc4) == 0x44 && /* marker check */
338 (q[12] & 3) == 3 && /* marker check */
339 q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
340 q[15 + stuffing] == 0 &&
341 q[16 + stuffing] == 1) {
342 /* We declare we actually found a Program Pack*/
343 cx->search_pack_header = 0; /* expect vid PES */
344 len = (char *)q - start;
345 cx18_setup_sliced_vbi_mdl(cx);
346 *stop = true;
347 break;
348 }
349 }
350 }
351 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
352 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
353 len, s->name);
354 return -EFAULT;
355 }
356 buf->readpos += len;
357 if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
358 buf != &cx->vbi.sliced_mpeg_buf)
359 cx->mpg_data_received += len;
360 return len;
361 }
362
cx18_copy_mdl_to_user(struct cx18_stream * s,struct cx18_mdl * mdl,char __user * ubuf,size_t ucount)363 static size_t cx18_copy_mdl_to_user(struct cx18_stream *s,
364 struct cx18_mdl *mdl, char __user *ubuf, size_t ucount)
365 {
366 size_t tot_written = 0;
367 int rc;
368 bool stop = false;
369
370 if (mdl->curr_buf == NULL)
371 mdl->curr_buf = list_first_entry(&mdl->buf_list,
372 struct cx18_buffer, list);
373
374 if (list_entry_is_past_end(mdl->curr_buf, &mdl->buf_list, list)) {
375 /*
376 * For some reason we've exhausted the buffers, but the MDL
377 * object still said some data was unread.
378 * Fix that and bail out.
379 */
380 mdl->readpos = mdl->bytesused;
381 return 0;
382 }
383
384 list_for_each_entry_from(mdl->curr_buf, &mdl->buf_list, list) {
385
386 if (mdl->curr_buf->readpos >= mdl->curr_buf->bytesused)
387 continue;
388
389 rc = cx18_copy_buf_to_user(s, mdl->curr_buf, ubuf + tot_written,
390 ucount - tot_written, &stop);
391 if (rc < 0)
392 return rc;
393 mdl->readpos += rc;
394 tot_written += rc;
395
396 if (stop || /* Forced stopping point for VBI insertion */
397 tot_written >= ucount || /* Reader request satisfied */
398 mdl->curr_buf->readpos < mdl->curr_buf->bytesused ||
399 mdl->readpos >= mdl->bytesused) /* MDL buffers drained */
400 break;
401 }
402 return tot_written;
403 }
404
cx18_read(struct cx18_stream * s,char __user * ubuf,size_t tot_count,int non_block)405 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
406 size_t tot_count, int non_block)
407 {
408 struct cx18 *cx = s->cx;
409 size_t tot_written = 0;
410 int single_frame = 0;
411
412 if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
413 /* shouldn't happen */
414 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
415 s->name);
416 return -EIO;
417 }
418
419 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
420 frames should arrive one-by-one, so make sure we never output more
421 than one VBI frame at a time */
422 if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
423 single_frame = 1;
424
425 for (;;) {
426 struct cx18_mdl *mdl;
427 int rc;
428
429 mdl = cx18_get_mdl(s, non_block, &rc);
430 /* if there is no data available... */
431 if (mdl == NULL) {
432 /* if we got data, then return that regardless */
433 if (tot_written)
434 break;
435 /* EOS condition */
436 if (rc == 0) {
437 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
438 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
439 cx18_release_stream(s);
440 }
441 /* set errno */
442 return rc;
443 }
444
445 rc = cx18_copy_mdl_to_user(s, mdl, ubuf + tot_written,
446 tot_count - tot_written);
447
448 if (mdl != &cx->vbi.sliced_mpeg_mdl) {
449 if (mdl->readpos == mdl->bytesused)
450 cx18_stream_put_mdl_fw(s, mdl);
451 else
452 cx18_push(s, mdl, &s->q_full);
453 } else if (mdl->readpos == mdl->bytesused) {
454 int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
455
456 cx->vbi.sliced_mpeg_size[idx] = 0;
457 cx->vbi.inserted_frame++;
458 cx->vbi_data_inserted += mdl->bytesused;
459 }
460 if (rc < 0)
461 return rc;
462 tot_written += rc;
463
464 if (tot_written == tot_count || single_frame)
465 break;
466 }
467 return tot_written;
468 }
469
cx18_read_pos(struct cx18_stream * s,char __user * ubuf,size_t count,loff_t * pos,int non_block)470 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
471 size_t count, loff_t *pos, int non_block)
472 {
473 ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
474 struct cx18 *cx = s->cx;
475
476 CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
477 if (rc > 0)
478 *pos += rc;
479 return rc;
480 }
481
cx18_start_capture(struct cx18_open_id * id)482 int cx18_start_capture(struct cx18_open_id *id)
483 {
484 struct cx18 *cx = id->cx;
485 struct cx18_stream *s = &cx->streams[id->type];
486 struct cx18_stream *s_vbi;
487 struct cx18_stream *s_idx;
488
489 if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
490 /* you cannot read from these stream types. */
491 return -EPERM;
492 }
493
494 /* Try to claim this stream. */
495 if (cx18_claim_stream(id, s->type))
496 return -EBUSY;
497
498 /* If capture is already in progress, then we also have to
499 do nothing extra. */
500 if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
501 test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
502 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
503 return 0;
504 }
505
506 /* Start associated VBI or IDX stream capture if required */
507 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
508 s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
509 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
510 /*
511 * The VBI and IDX streams should have been claimed
512 * automatically, if for internal use, when the MPG stream was
513 * claimed. We only need to start these streams capturing.
514 */
515 if (test_bit(CX18_F_S_INTERNAL_USE, &s_idx->s_flags) &&
516 !test_and_set_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
517 if (cx18_start_v4l2_encode_stream(s_idx)) {
518 CX18_DEBUG_WARN("IDX capture start failed\n");
519 clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
520 goto start_failed;
521 }
522 CX18_DEBUG_INFO("IDX capture started\n");
523 }
524 if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
525 !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
526 if (cx18_start_v4l2_encode_stream(s_vbi)) {
527 CX18_DEBUG_WARN("VBI capture start failed\n");
528 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
529 goto start_failed;
530 }
531 CX18_DEBUG_INFO("VBI insertion started\n");
532 }
533 }
534
535 /* Tell the card to start capturing */
536 if (!cx18_start_v4l2_encode_stream(s)) {
537 /* We're done */
538 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
539 /* Resume a possibly paused encoder */
540 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
541 cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
542 return 0;
543 }
544
545 start_failed:
546 CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
547
548 /*
549 * The associated VBI and IDX streams for internal use are released
550 * automatically when the MPG stream is released. We only need to stop
551 * the associated stream.
552 */
553 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
554 /* Stop the IDX stream which is always for internal use */
555 if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
556 cx18_stop_v4l2_encode_stream(s_idx, 0);
557 clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
558 }
559 /* Stop the VBI stream, if only running for internal use */
560 if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
561 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
562 cx18_stop_v4l2_encode_stream(s_vbi, 0);
563 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
564 }
565 }
566 clear_bit(CX18_F_S_STREAMING, &s->s_flags);
567 cx18_release_stream(s); /* Also releases associated streams */
568 return -EIO;
569 }
570
cx18_v4l2_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)571 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
572 loff_t *pos)
573 {
574 struct cx18_open_id *id = file2id(filp);
575 struct cx18 *cx = id->cx;
576 struct cx18_stream *s = &cx->streams[id->type];
577 int rc;
578
579 CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
580
581 mutex_lock(&cx->serialize_lock);
582 rc = cx18_start_capture(id);
583 mutex_unlock(&cx->serialize_lock);
584 if (rc)
585 return rc;
586
587 return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
588 }
589
cx18_v4l2_enc_poll(struct file * filp,poll_table * wait)590 __poll_t cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
591 {
592 __poll_t req_events = poll_requested_events(wait);
593 struct cx18_open_id *id = file2id(filp);
594 struct cx18 *cx = id->cx;
595 struct cx18_stream *s = &cx->streams[id->type];
596 int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
597 __poll_t res = 0;
598
599 /* Start a capture if there is none */
600 if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags) &&
601 (req_events & (EPOLLIN | EPOLLRDNORM))) {
602 int rc;
603
604 mutex_lock(&cx->serialize_lock);
605 rc = cx18_start_capture(id);
606 mutex_unlock(&cx->serialize_lock);
607 if (rc) {
608 CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
609 s->name, rc);
610 return EPOLLERR;
611 }
612 CX18_DEBUG_FILE("Encoder poll started capture\n");
613 }
614
615 /* add stream's waitq to the poll list */
616 CX18_DEBUG_HI_FILE("Encoder poll\n");
617 if (v4l2_event_pending(&id->fh))
618 res |= EPOLLPRI;
619 else
620 poll_wait(filp, &s->waitq, wait);
621
622 if (atomic_read(&s->q_full.depth))
623 return res | EPOLLIN | EPOLLRDNORM;
624 if (eof)
625 return res | EPOLLHUP;
626 return res;
627 }
628
cx18_vb_timeout(struct timer_list * t)629 void cx18_vb_timeout(struct timer_list *t)
630 {
631 struct cx18_stream *s = from_timer(s, t, vb_timeout);
632
633 /*
634 * Return all of the buffers in error state, so the vbi/vid inode
635 * can return from blocking.
636 */
637 cx18_clear_queue(s, VB2_BUF_STATE_ERROR);
638 }
639
cx18_stop_capture(struct cx18_stream * s,int gop_end)640 void cx18_stop_capture(struct cx18_stream *s, int gop_end)
641 {
642 struct cx18 *cx = s->cx;
643 struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
644 struct cx18_stream *s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
645
646 CX18_DEBUG_IOCTL("close() of %s\n", s->name);
647
648 /* 'Unclaim' this stream */
649
650 /* Stop capturing */
651 if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
652 CX18_DEBUG_INFO("close stopping capture\n");
653 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
654 /* Stop internal use associated VBI and IDX streams */
655 if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
656 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
657 CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
658 cx18_stop_v4l2_encode_stream(s_vbi, 0);
659 }
660 if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
661 CX18_DEBUG_INFO("close stopping IDX capture\n");
662 cx18_stop_v4l2_encode_stream(s_idx, 0);
663 }
664 }
665 if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
666 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
667 /* Also used internally, don't stop capturing */
668 s->id = -1;
669 else
670 cx18_stop_v4l2_encode_stream(s, gop_end);
671 }
672 if (!gop_end) {
673 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
674 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
675 cx18_release_stream(s);
676 }
677 }
678
cx18_v4l2_close(struct file * filp)679 int cx18_v4l2_close(struct file *filp)
680 {
681 struct v4l2_fh *fh = filp->private_data;
682 struct cx18_open_id *id = fh2id(fh);
683 struct cx18 *cx = id->cx;
684 struct cx18_stream *s = &cx->streams[id->type];
685 struct video_device *vdev = &s->video_dev;
686
687 CX18_DEBUG_IOCTL("close() of %s\n", s->name);
688
689 mutex_lock(&cx->serialize_lock);
690 /* Stop radio */
691 if (id->type == CX18_ENC_STREAM_TYPE_RAD &&
692 v4l2_fh_is_singular_file(filp)) {
693 /* Closing radio device, return to TV mode */
694 cx18_mute(cx);
695 /* Mark that the radio is no longer in use */
696 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
697 /* Switch tuner to TV */
698 cx18_call_all(cx, video, s_std, cx->std);
699 /* Select correct audio input (i.e. TV tuner or Line in) */
700 cx18_audio_set_io(cx);
701 if (atomic_read(&cx->ana_capturing) > 0) {
702 /* Undo video mute */
703 cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
704 (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute) |
705 (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute_yuv) << 8)));
706 }
707 /* Done! Unmute and continue. */
708 cx18_unmute(cx);
709 }
710
711 if (id->type == CX18_ENC_STREAM_TYPE_YUV &&
712 filp->private_data == vdev->queue->owner) {
713 vb2_queue_release(vdev->queue);
714 vdev->queue->owner = NULL;
715 }
716 v4l2_fh_del(fh);
717 v4l2_fh_exit(fh);
718
719 /* 'Unclaim' this stream */
720 if (id->type != CX18_ENC_STREAM_TYPE_YUV && s->id == id->open_id)
721 cx18_stop_capture(s, 0);
722 kfree(id);
723 mutex_unlock(&cx->serialize_lock);
724 return 0;
725 }
726
cx18_serialized_open(struct cx18_stream * s,struct file * filp)727 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
728 {
729 struct cx18 *cx = s->cx;
730 struct cx18_open_id *item;
731
732 CX18_DEBUG_FILE("open %s\n", s->name);
733
734 /* Allocate memory */
735 item = kzalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
736 if (NULL == item) {
737 CX18_DEBUG_WARN("nomem on v4l2 open\n");
738 return -ENOMEM;
739 }
740 v4l2_fh_init(&item->fh, &s->video_dev);
741
742 item->cx = cx;
743 item->type = s->type;
744
745 item->open_id = cx->open_id++;
746 filp->private_data = &item->fh;
747 v4l2_fh_add(&item->fh);
748
749 if (item->type == CX18_ENC_STREAM_TYPE_RAD &&
750 v4l2_fh_is_singular_file(filp)) {
751 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
752 if (atomic_read(&cx->ana_capturing) > 0) {
753 /* switching to radio while capture is
754 in progress is not polite */
755 v4l2_fh_del(&item->fh);
756 v4l2_fh_exit(&item->fh);
757 kfree(item);
758 return -EBUSY;
759 }
760 }
761
762 /* Mark that the radio is being used. */
763 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
764 /* We have the radio */
765 cx18_mute(cx);
766 /* Switch tuner to radio */
767 cx18_call_all(cx, tuner, s_radio);
768 /* Select the correct audio input (i.e. radio tuner) */
769 cx18_audio_set_io(cx);
770 /* Done! Unmute and continue. */
771 cx18_unmute(cx);
772 }
773 return 0;
774 }
775
cx18_v4l2_open(struct file * filp)776 int cx18_v4l2_open(struct file *filp)
777 {
778 int res;
779 struct video_device *video_dev = video_devdata(filp);
780 struct cx18_stream *s = video_get_drvdata(video_dev);
781 struct cx18 *cx = s->cx;
782
783 mutex_lock(&cx->serialize_lock);
784 if (cx18_init_on_first_open(cx)) {
785 CX18_ERR("Failed to initialize on %s\n",
786 video_device_node_name(video_dev));
787 mutex_unlock(&cx->serialize_lock);
788 return -ENXIO;
789 }
790 res = cx18_serialized_open(s, filp);
791 mutex_unlock(&cx->serialize_lock);
792 return res;
793 }
794
cx18_mute(struct cx18 * cx)795 void cx18_mute(struct cx18 *cx)
796 {
797 u32 h;
798 if (atomic_read(&cx->ana_capturing)) {
799 h = cx18_find_handle(cx);
800 if (h != CX18_INVALID_TASK_HANDLE)
801 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
802 else
803 CX18_ERR("Can't find valid task handle for mute\n");
804 }
805 CX18_DEBUG_INFO("Mute\n");
806 }
807
cx18_unmute(struct cx18 * cx)808 void cx18_unmute(struct cx18 *cx)
809 {
810 u32 h;
811 if (atomic_read(&cx->ana_capturing)) {
812 h = cx18_find_handle(cx);
813 if (h != CX18_INVALID_TASK_HANDLE) {
814 cx18_msleep_timeout(100, 0);
815 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
816 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
817 } else
818 CX18_ERR("Can't find valid task handle for unmute\n");
819 }
820 CX18_DEBUG_INFO("Unmute\n");
821 }
822