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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / media / pci / ivtv / ivtv-fileops.c
blob4202c3a47d33e6ae15aeca22585d1e9423df6f6c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 file operation functions
4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
7
8 */
9
10 #include "ivtv-driver.h"
11 #include "ivtv-fileops.h"
12 #include "ivtv-i2c.h"
13 #include "ivtv-queue.h"
14 #include "ivtv-udma.h"
15 #include "ivtv-irq.h"
16 #include "ivtv-vbi.h"
17 #include "ivtv-mailbox.h"
18 #include "ivtv-routing.h"
19 #include "ivtv-streams.h"
20 #include "ivtv-yuv.h"
21 #include "ivtv-ioctl.h"
22 #include "ivtv-cards.h"
23 #include "ivtv-firmware.h"
24 #include <media/v4l2-event.h>
25 #include <media/i2c/saa7115.h>
26
27 /* This function tries to claim the stream for a specific file descriptor.
28 If no one else is using this stream then the stream is claimed and
29 associated VBI streams are also automatically claimed.
30 Possible error returns: -EBUSY if someone else has claimed
31 the stream or 0 on success. */
32 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
33 {
34 struct ivtv *itv = id->itv;
35 struct ivtv_stream *s = &itv->streams[type];
36 struct ivtv_stream *s_vbi;
37 int vbi_type;
38
39 if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
40 /* someone already claimed this stream */
41 if (s->fh == &id->fh) {
42 /* yes, this file descriptor did. So that's OK. */
43 return 0;
44 }
45 if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
46 type == IVTV_ENC_STREAM_TYPE_VBI)) {
47 /* VBI is handled already internally, now also assign
48 the file descriptor to this stream for external
49 reading of the stream. */
50 s->fh = &id->fh;
51 IVTV_DEBUG_INFO("Start Read VBI\n");
52 return 0;
53 }
54 /* someone else is using this stream already */
55 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
56 return -EBUSY;
57 }
58 s->fh = &id->fh;
59 if (type == IVTV_DEC_STREAM_TYPE_VBI) {
60 /* Enable reinsertion interrupt */
61 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
62 }
63
64 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
65 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
66 (provided VBI insertion is on and sliced VBI is selected), for all
67 other streams we're done */
68 if (type == IVTV_DEC_STREAM_TYPE_MPG) {
69 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
70 } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
71 itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
72 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
73 } else {
74 return 0;
75 }
76 s_vbi = &itv->streams[vbi_type];
77
78 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
79 /* Enable reinsertion interrupt */
80 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
81 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
82 }
83 /* mark that it is used internally */
84 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
85 return 0;
86 }
87 EXPORT_SYMBOL(ivtv_claim_stream);
88
89 /* This function releases a previously claimed stream. It will take into
90 account associated VBI streams. */
91 void ivtv_release_stream(struct ivtv_stream *s)
92 {
93 struct ivtv *itv = s->itv;
94 struct ivtv_stream *s_vbi;
95
96 s->fh = NULL;
97 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
98 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
99 /* this stream is still in use internally */
100 return;
101 }
102 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
103 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
104 return;
105 }
106
107 ivtv_flush_queues(s);
108
109 /* disable reinsertion interrupt */
110 if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
111 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
112
113 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
114 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
115 for all other streams we're done */
116 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
117 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
118 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
119 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
120 else
121 return;
122
123 /* clear internal use flag */
124 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
125 /* was already cleared */
126 return;
127 }
128 if (s_vbi->fh) {
129 /* VBI stream still claimed by a file descriptor */
130 return;
131 }
132 /* disable reinsertion interrupt */
133 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
134 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
135 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
136 ivtv_flush_queues(s_vbi);
137 }
138 EXPORT_SYMBOL(ivtv_release_stream);
139
140 static void ivtv_dualwatch(struct ivtv *itv)
141 {
142 struct v4l2_tuner vt;
143 u32 new_stereo_mode;
144 const u32 dual = 0x02;
145
146 new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
147 memset(&vt, 0, sizeof(vt));
148 ivtv_call_all(itv, tuner, g_tuner, &vt);
149 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
150 new_stereo_mode = dual;
151
152 if (new_stereo_mode == itv->dualwatch_stereo_mode)
153 return;
154
155 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
156 itv->dualwatch_stereo_mode, new_stereo_mode);
157 if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
158 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
159 }
160
161 static void ivtv_update_pgm_info(struct ivtv *itv)
162 {
163 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
164 int cnt;
165 int i = 0;
166
167 if (wr_idx >= itv->pgm_info_num) {
168 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
169 return;
170 }
171 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
172 while (i < cnt) {
173 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
174 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
175 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
176 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
177 V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
178 // 1=I, 2=P, 4=B
179
180 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
181 if (e->offset > itv->mpg_data_received) {
182 break;
183 }
184 e->offset += itv->vbi_data_inserted;
185 e->length = read_enc(addr);
186 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
187 e->flags = mapping[read_enc(addr + 12) & 7];
188 i++;
189 }
190 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
191 }
192
193 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
194 {
195 struct ivtv *itv = s->itv;
196 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
197 struct ivtv_buffer *buf;
198 DEFINE_WAIT(wait);
199
200 *err = 0;
201 while (1) {
202 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
203 /* Process pending program info updates and pending VBI data */
204 ivtv_update_pgm_info(itv);
205
206 if (time_after(jiffies,
207 itv->dualwatch_jiffies +
208 msecs_to_jiffies(1000))) {
209 itv->dualwatch_jiffies = jiffies;
210 ivtv_dualwatch(itv);
211 }
212
213 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
214 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
215 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
216 /* byteswap and process VBI data */
217 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
218 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
219 }
220 }
221 buf = &itv->vbi.sliced_mpeg_buf;
222 if (buf->readpos != buf->bytesused) {
223 return buf;
224 }
225 }
226
227 /* do we have leftover data? */
228 buf = ivtv_dequeue(s, &s->q_io);
229 if (buf)
230 return buf;
231
232 /* do we have new data? */
233 buf = ivtv_dequeue(s, &s->q_full);
234 if (buf) {
235 if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
236 return buf;
237 buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
238 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
239 /* byteswap MPG data */
240 ivtv_buf_swap(buf);
241 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
242 /* byteswap and process VBI data */
243 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
244 }
245 return buf;
246 }
247
248 /* return if end of stream */
249 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
250 IVTV_DEBUG_INFO("EOS %s\n", s->name);
251 return NULL;
252 }
253
254 /* return if file was opened with O_NONBLOCK */
255 if (non_block) {
256 *err = -EAGAIN;
257 return NULL;
258 }
259
260 /* wait for more data to arrive */
261 mutex_unlock(&itv->serialize_lock);
262 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
263 /* New buffers might have become available before we were added to the waitqueue */
264 if (!s->q_full.buffers)
265 schedule();
266 finish_wait(&s->waitq, &wait);
267 mutex_lock(&itv->serialize_lock);
268 if (signal_pending(current)) {
269 /* return if a signal was received */
270 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
271 *err = -EINTR;
272 return NULL;
273 }
274 }
275 }
276
277 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
278 {
279 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
280
281 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
282 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
283 itv->vbi.sliced_mpeg_buf.readpos = 0;
284 }
285
286 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
287 char __user *ubuf, size_t ucount)
288 {
289 struct ivtv *itv = s->itv;
290 size_t len = buf->bytesused - buf->readpos;
291
292 if (len > ucount) len = ucount;
293 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
294 !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
295 const char *start = buf->buf + buf->readpos;
296 const char *p = start + 1;
297 const u8 *q;
298 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
299 int stuffing, i;
300
301 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
302 p = q + 1;
303 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
304 q[1] != 0 || q[2] != 1 || q[3] != ch) {
305 continue;
306 }
307 if (!itv->search_pack_header) {
308 if ((q[6] & 0xc0) != 0x80)
309 continue;
310 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
311 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
312 ch = 0xba;
313 itv->search_pack_header = 1;
314 p = q + 9;
315 }
316 continue;
317 }
318 stuffing = q[13] & 7;
319 /* all stuffing bytes must be 0xff */
320 for (i = 0; i < stuffing; i++)
321 if (q[14 + i] != 0xff)
322 break;
323 if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
324 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
325 q[16 + stuffing] == 1) {
326 itv->search_pack_header = 0;
327 len = (char *)q - start;
328 ivtv_setup_sliced_vbi_buf(itv);
329 break;
330 }
331 }
332 }
333 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
334 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
335 return -EFAULT;
336 }
337 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
338 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
339 buf == &itv->vbi.sliced_mpeg_buf); */
340 buf->readpos += len;
341 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
342 itv->mpg_data_received += len;
343 return len;
344 }
345
346 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
347 {
348 struct ivtv *itv = s->itv;
349 size_t tot_written = 0;
350 int single_frame = 0;
351
352 if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) {
353 /* shouldn't happen */
354 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
355 return -EIO;
356 }
357
358 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
359 arrive one-by-one, so make sure we never output more than one VBI frame at a time */
360 if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
361 (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
362 single_frame = 1;
363
364 for (;;) {
365 struct ivtv_buffer *buf;
366 int rc;
367
368 buf = ivtv_get_buffer(s, non_block, &rc);
369 /* if there is no data available... */
370 if (buf == NULL) {
371 /* if we got data, then return that regardless */
372 if (tot_written)
373 break;
374 /* EOS condition */
375 if (rc == 0) {
376 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
377 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
378 ivtv_release_stream(s);
379 }
380 /* set errno */
381 return rc;
382 }
383 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
384 if (buf != &itv->vbi.sliced_mpeg_buf) {
385 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
386 }
387 else if (buf->readpos == buf->bytesused) {
388 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
389 itv->vbi.sliced_mpeg_size[idx] = 0;
390 itv->vbi.inserted_frame++;
391 itv->vbi_data_inserted += buf->bytesused;
392 }
393 if (rc < 0)
394 return rc;
395 tot_written += rc;
396
397 if (tot_written == tot_count || single_frame)
398 break;
399 }
400 return tot_written;
401 }
402
403 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
404 loff_t *pos, int non_block)
405 {
406 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
407 struct ivtv *itv = s->itv;
408
409 IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
410 if (rc > 0)
411 *pos += rc;
412 return rc;
413 }
414
415 int ivtv_start_capture(struct ivtv_open_id *id)
416 {
417 struct ivtv *itv = id->itv;
418 struct ivtv_stream *s = &itv->streams[id->type];
419 struct ivtv_stream *s_vbi;
420
421 if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
422 s->type == IVTV_DEC_STREAM_TYPE_MPG ||
423 s->type == IVTV_DEC_STREAM_TYPE_YUV ||
424 s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
425 /* you cannot read from these stream types. */
426 return -EINVAL;
427 }
428
429 /* Try to claim this stream. */
430 if (ivtv_claim_stream(id, s->type))
431 return -EBUSY;
432
433 /* This stream does not need to start capturing */
434 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
435 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
436 return 0;
437 }
438
439 /* If capture is already in progress, then we also have to
440 do nothing extra. */
441 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
442 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
443 return 0;
444 }
445
446 /* Start VBI capture if required */
447 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
448 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
449 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
450 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
451 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
452 automatically when the MPG stream is claimed.
453 We only need to start the VBI capturing. */
454 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
455 IVTV_DEBUG_WARN("VBI capture start failed\n");
456
457 /* Failure, clean up and return an error */
458 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
459 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
460 /* also releases the associated VBI stream */
461 ivtv_release_stream(s);
462 return -EIO;
463 }
464 IVTV_DEBUG_INFO("VBI insertion started\n");
465 }
466
467 /* Tell the card to start capturing */
468 if (!ivtv_start_v4l2_encode_stream(s)) {
469 /* We're done */
470 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
471 /* Resume a possibly paused encoder */
472 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
473 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
474 return 0;
475 }
476
477 /* failure, clean up */
478 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
479
480 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
481 automatically when the MPG stream is released.
482 We only need to stop the VBI capturing. */
483 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
484 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
485 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
486 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
487 }
488 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
489 ivtv_release_stream(s);
490 return -EIO;
491 }
492
493 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
494 {
495 struct ivtv_open_id *id = fh2id(filp->private_data);
496 struct ivtv *itv = id->itv;
497 struct ivtv_stream *s = &itv->streams[id->type];
498 ssize_t rc;
499
500 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
501
502 if (mutex_lock_interruptible(&itv->serialize_lock))
503 return -ERESTARTSYS;
504 rc = ivtv_start_capture(id);
505 if (!rc)
506 rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
507 mutex_unlock(&itv->serialize_lock);
508 return rc;
509 }
510
511 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
512 {
513 struct ivtv *itv = id->itv;
514 struct ivtv_stream *s = &itv->streams[id->type];
515 int rc;
516
517 if (atomic_read(&itv->decoding) == 0) {
518 if (ivtv_claim_stream(id, s->type)) {
519 /* someone else is using this stream already */
520 IVTV_DEBUG_WARN("start decode, stream already claimed\n");
521 return -EBUSY;
522 }
523 rc = ivtv_start_v4l2_decode_stream(s, 0);
524 if (rc < 0) {
525 if (rc == -EAGAIN)
526 rc = ivtv_start_v4l2_decode_stream(s, 0);
527 if (rc < 0)
528 return rc;
529 }
530 }
531 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
532 return ivtv_set_speed(itv, speed);
533 return 0;
534 }
535
536 static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
537 {
538 struct ivtv_open_id *id = fh2id(filp->private_data);
539 struct ivtv *itv = id->itv;
540 struct ivtv_stream *s = &itv->streams[id->type];
541 struct yuv_playback_info *yi = &itv->yuv_info;
542 struct ivtv_buffer *buf;
543 struct ivtv_queue q;
544 int bytes_written = 0;
545 int mode;
546 int rc;
547 DEFINE_WAIT(wait);
548
549 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
550
551 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
552 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
553 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
554 /* not decoder streams */
555 return -EINVAL;
556
557 /* Try to claim this stream */
558 if (ivtv_claim_stream(id, s->type))
559 return -EBUSY;
560
561 /* This stream does not need to start any decoding */
562 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
563 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
564
565 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
566 return ivtv_write_vbi_from_user(itv,
567 (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
568 }
569
570 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
571
572 if (ivtv_set_output_mode(itv, mode) != mode) {
573 ivtv_release_stream(s);
574 return -EBUSY;
575 }
576 ivtv_queue_init(&q);
577 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
578
579 /* Start decoder (returns 0 if already started) */
580 rc = ivtv_start_decoding(id, itv->speed);
581 if (rc) {
582 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
583
584 /* failure, clean up */
585 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
586 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
587 return rc;
588 }
589
590 retry:
591 /* If possible, just DMA the entire frame - Check the data transfer size
592 since we may get here before the stream has been fully set-up */
593 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
594 while (count >= itv->dma_data_req_size) {
595 rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
596
597 if (rc < 0)
598 return rc;
599
600 bytes_written += itv->dma_data_req_size;
601 user_buf += itv->dma_data_req_size;
602 count -= itv->dma_data_req_size;
603 }
604 if (count == 0) {
605 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
606 return bytes_written;
607 }
608 }
609
610 for (;;) {
611 /* Gather buffers */
612 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
613 ivtv_enqueue(s, buf, &q);
614 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
615 ivtv_enqueue(s, buf, &q);
616 }
617 if (q.buffers)
618 break;
619 if (filp->f_flags & O_NONBLOCK)
620 return -EAGAIN;
621 mutex_unlock(&itv->serialize_lock);
622 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
623 /* New buffers might have become free before we were added to the waitqueue */
624 if (!s->q_free.buffers)
625 schedule();
626 finish_wait(&s->waitq, &wait);
627 mutex_lock(&itv->serialize_lock);
628 if (signal_pending(current)) {
629 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
630 return -EINTR;
631 }
632 }
633
634 /* copy user data into buffers */
635 while ((buf = ivtv_dequeue(s, &q))) {
636 /* yuv is a pain. Don't copy more data than needed for a single
637 frame, otherwise we lose sync with the incoming stream */
638 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
639 yi->stream_size + count > itv->dma_data_req_size)
640 rc = ivtv_buf_copy_from_user(s, buf, user_buf,
641 itv->dma_data_req_size - yi->stream_size);
642 else
643 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
644
645 /* Make sure we really got all the user data */
646 if (rc < 0) {
647 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
648 return rc;
649 }
650 user_buf += rc;
651 count -= rc;
652 bytes_written += rc;
653
654 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
655 yi->stream_size += rc;
656 /* If we have a complete yuv frame, break loop now */
657 if (yi->stream_size == itv->dma_data_req_size) {
658 ivtv_enqueue(s, buf, &s->q_full);
659 yi->stream_size = 0;
660 break;
661 }
662 }
663
664 if (buf->bytesused != s->buf_size) {
665 /* incomplete, leave in q_io for next time */
666 ivtv_enqueue(s, buf, &s->q_io);
667 break;
668 }
669 /* Byteswap MPEG buffer */
670 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
671 ivtv_buf_swap(buf);
672 ivtv_enqueue(s, buf, &s->q_full);
673 }
674
675 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
676 if (s->q_full.length >= itv->dma_data_req_size) {
677 int got_sig;
678
679 if (mode == OUT_YUV)
680 ivtv_yuv_setup_stream_frame(itv);
681
682 mutex_unlock(&itv->serialize_lock);
683 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
684 while (!(got_sig = signal_pending(current)) &&
685 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
686 schedule();
687 }
688 finish_wait(&itv->dma_waitq, &wait);
689 mutex_lock(&itv->serialize_lock);
690 if (got_sig) {
691 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
692 return -EINTR;
693 }
694
695 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
696 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
697 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
698 }
699 }
700 /* more user data is available, wait until buffers become free
701 to transfer the rest. */
702 if (count && !(filp->f_flags & O_NONBLOCK))
703 goto retry;
704 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
705 return bytes_written;
706 }
707
708 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
709 {
710 struct ivtv_open_id *id = fh2id(filp->private_data);
711 struct ivtv *itv = id->itv;
712 ssize_t res;
713
714 if (mutex_lock_interruptible(&itv->serialize_lock))
715 return -ERESTARTSYS;
716 res = ivtv_write(filp, user_buf, count, pos);
717 mutex_unlock(&itv->serialize_lock);
718 return res;
719 }
720
721 __poll_t ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
722 {
723 struct ivtv_open_id *id = fh2id(filp->private_data);
724 struct ivtv *itv = id->itv;
725 struct ivtv_stream *s = &itv->streams[id->type];
726 __poll_t res = 0;
727
728 /* add stream's waitq to the poll list */
729 IVTV_DEBUG_HI_FILE("Decoder poll\n");
730
731 /* If there are subscribed events, then only use the new event
732 API instead of the old video.h based API. */
733 if (!list_empty(&id->fh.subscribed)) {
734 poll_wait(filp, &id->fh.wait, wait);
735 /* Turn off the old-style vsync events */
736 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
737 if (v4l2_event_pending(&id->fh))
738 res = EPOLLPRI;
739 } else {
740 /* This is the old-style API which is here only for backwards
741 compatibility. */
742 poll_wait(filp, &s->waitq, wait);
743 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
744 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
745 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
746 res = EPOLLPRI;
747 }
748
749 /* Allow write if buffers are available for writing */
750 if (s->q_free.buffers)
751 res |= EPOLLOUT | EPOLLWRNORM;
752 return res;
753 }
754
755 __poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
756 {
757 __poll_t req_events = poll_requested_events(wait);
758 struct ivtv_open_id *id = fh2id(filp->private_data);
759 struct ivtv *itv = id->itv;
760 struct ivtv_stream *s = &itv->streams[id->type];
761 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
762 __poll_t res = 0;
763
764 /* Start a capture if there is none */
765 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
766 s->type != IVTV_ENC_STREAM_TYPE_RAD &&
767 (req_events & (EPOLLIN | EPOLLRDNORM))) {
768 int rc;
769
770 mutex_lock(&itv->serialize_lock);
771 rc = ivtv_start_capture(id);
772 mutex_unlock(&itv->serialize_lock);
773 if (rc) {
774 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
775 s->name, rc);
776 return EPOLLERR;
777 }
778 IVTV_DEBUG_FILE("Encoder poll started capture\n");
779 }
780
781 /* add stream's waitq to the poll list */
782 IVTV_DEBUG_HI_FILE("Encoder poll\n");
783 poll_wait(filp, &s->waitq, wait);
784 if (v4l2_event_pending(&id->fh))
785 res |= EPOLLPRI;
786 else
787 poll_wait(filp, &id->fh.wait, wait);
788
789 if (s->q_full.length || s->q_io.length)
790 return res | EPOLLIN | EPOLLRDNORM;
791 if (eof)
792 return res | EPOLLHUP;
793 return res;
794 }
795
796 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
797 {
798 struct ivtv *itv = id->itv;
799 struct ivtv_stream *s = &itv->streams[id->type];
800
801 IVTV_DEBUG_FILE("close() of %s\n", s->name);
802
803 /* 'Unclaim' this stream */
804
805 /* Stop capturing */
806 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
807 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
808
809 IVTV_DEBUG_INFO("close stopping capture\n");
810 /* Special case: a running VBI capture for VBI insertion
811 in the mpeg stream. Need to stop that too. */
812 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
813 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
814 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
815 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
816 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
817 }
818 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
819 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
820 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
821 /* Also used internally, don't stop capturing */
822 s->fh = NULL;
823 }
824 else {
825 ivtv_stop_v4l2_encode_stream(s, gop_end);
826 }
827 }
828 if (!gop_end) {
829 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
830 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
831 ivtv_release_stream(s);
832 }
833 }
834
835 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
836 {
837 struct ivtv *itv = id->itv;
838 struct ivtv_stream *s = &itv->streams[id->type];
839
840 IVTV_DEBUG_FILE("close() of %s\n", s->name);
841
842 if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
843 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
844 /* Restore registers we've changed & clean up any mess */
845 ivtv_yuv_close(itv);
846 }
847
848 /* Stop decoding */
849 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
850 IVTV_DEBUG_INFO("close stopping decode\n");
851
852 ivtv_stop_v4l2_decode_stream(s, flags, pts);
853 itv->output_mode = OUT_NONE;
854 }
855 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
856 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
857
858 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
859 itv->output_mode = OUT_NONE;
860
861 itv->speed = 0;
862 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
863 ivtv_release_stream(s);
864 }
865
866 int ivtv_v4l2_close(struct file *filp)
867 {
868 struct v4l2_fh *fh = filp->private_data;
869 struct ivtv_open_id *id = fh2id(fh);
870 struct ivtv *itv = id->itv;
871 struct ivtv_stream *s = &itv->streams[id->type];
872
873 IVTV_DEBUG_FILE("close %s\n", s->name);
874
875 mutex_lock(&itv->serialize_lock);
876
877 /* Stop radio */
878 if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
879 v4l2_fh_is_singular_file(filp)) {
880 /* Closing radio device, return to TV mode */
881 ivtv_mute(itv);
882 /* Mark that the radio is no longer in use */
883 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
884 /* Switch tuner to TV */
885 ivtv_call_all(itv, video, s_std, itv->std);
886 /* Select correct audio input (i.e. TV tuner or Line in) */
887 ivtv_audio_set_io(itv);
888 if (itv->hw_flags & IVTV_HW_SAA711X) {
889 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
890 SAA7115_FREQ_32_11_MHZ, 0);
891 }
892 if (atomic_read(&itv->capturing) > 0) {
893 /* Undo video mute */
894 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
895 v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
896 (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
897 }
898 /* Done! Unmute and continue. */
899 ivtv_unmute(itv);
900 }
901
902 v4l2_fh_del(fh);
903 v4l2_fh_exit(fh);
904
905 /* Easy case first: this stream was never claimed by us */
906 if (s->fh != &id->fh)
907 goto close_done;
908
909 /* 'Unclaim' this stream */
910
911 if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
912 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
913
914 ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0);
915
916 /* If all output streams are closed, and if the user doesn't have
917 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
918 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
919 /* disable CC on TV-out */
920 ivtv_disable_cc(itv);
921 }
922 } else {
923 ivtv_stop_capture(id, 0);
924 }
925 close_done:
926 kfree(id);
927 mutex_unlock(&itv->serialize_lock);
928 return 0;
929 }
930
931 static int ivtv_open(struct file *filp)
932 {
933 struct video_device *vdev = video_devdata(filp);
934 struct ivtv_stream *s = video_get_drvdata(vdev);
935 struct ivtv *itv = s->itv;
936 struct ivtv_open_id *item;
937 int res = 0;
938
939 IVTV_DEBUG_FILE("open %s\n", s->name);
940
941 if (ivtv_init_on_first_open(itv)) {
942 IVTV_ERR("Failed to initialize on device %s\n",
943 video_device_node_name(vdev));
944 return -ENXIO;
945 }
946
947 #ifdef CONFIG_VIDEO_ADV_DEBUG
948 /* Unless ivtv_fw_debug is set, error out if firmware dead. */
949 if (ivtv_fw_debug) {
950 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
951 video_device_node_name(vdev));
952 IVTV_WARN("Selected firmware errors will be ignored\n");
953 } else {
954 #else
955 if (1) {
956 #endif
957 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
958 if (res == -EAGAIN)
959 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
960 if (res < 0)
961 return -EIO;
962 }
963
964 if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
965 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
966 return -EBUSY;
967
968 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
969 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
970 return -EBUSY;
971
972 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
973 if (read_reg(0x82c) == 0) {
974 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
975 /* return -ENODEV; */
976 }
977 ivtv_udma_alloc(itv);
978 }
979
980 /* Allocate memory */
981 item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
982 if (NULL == item) {
983 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
984 return -ENOMEM;
985 }
986 v4l2_fh_init(&item->fh, &s->vdev);
987 item->itv = itv;
988 item->type = s->type;
989
990 filp->private_data = &item->fh;
991 v4l2_fh_add(&item->fh);
992
993 if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
994 v4l2_fh_is_singular_file(filp)) {
995 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
996 if (atomic_read(&itv->capturing) > 0) {
997 /* switching to radio while capture is
998 in progress is not polite */
999 v4l2_fh_del(&item->fh);
1000 v4l2_fh_exit(&item->fh);
1001 kfree(item);
1002 return -EBUSY;
1003 }
1004 }
1005 /* Mark that the radio is being used. */
1006 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1007 /* We have the radio */
1008 ivtv_mute(itv);
1009 /* Switch tuner to radio */
1010 ivtv_call_all(itv, tuner, s_radio);
1011 /* Select the correct audio input (i.e. radio tuner) */
1012 ivtv_audio_set_io(itv);
1013 if (itv->hw_flags & IVTV_HW_SAA711X) {
1014 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1015 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1016 }
1017 /* Done! Unmute and continue. */
1018 ivtv_unmute(itv);
1019 }
1020
1021 /* YUV or MPG Decoding Mode? */
1022 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1023 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1024 } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1025 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1026 /* For yuv, we need to know the dma size before we start */
1027 itv->dma_data_req_size =
1028 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1029 itv->yuv_info.stream_size = 0;
1030 }
1031 return 0;
1032 }
1033
1034 int ivtv_v4l2_open(struct file *filp)
1035 {
1036 struct video_device *vdev = video_devdata(filp);
1037 int res;
1038
1039 if (mutex_lock_interruptible(vdev->lock))
1040 return -ERESTARTSYS;
1041 res = ivtv_open(filp);
1042 mutex_unlock(vdev->lock);
1043 return res;
1044 }
1045
1046 void ivtv_mute(struct ivtv *itv)
1047 {
1048 if (atomic_read(&itv->capturing))
1049 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1050 IVTV_DEBUG_INFO("Mute\n");
1051 }
1052
1053 void ivtv_unmute(struct ivtv *itv)
1054 {
1055 if (atomic_read(&itv->capturing)) {
1056 ivtv_msleep_timeout(100, 0);
1057 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1058 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1059 }
1060 IVTV_DEBUG_INFO("Unmute\n");
1061 }
Linux with added FPC-III support