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V4L/DVB (6046): ivtv: always steal full frames if out of buffers.
[firewire-audio.git] / drivers / media / video / ivtv / ivtv-fileops.c
blob076b0089a2b0b76dbdec284048720a16b4ad3d7f
1 /*
2 file operation functions
3 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
4 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
5 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include "ivtv-driver.h"
23 #include "ivtv-fileops.h"
24 #include "ivtv-i2c.h"
25 #include "ivtv-queue.h"
26 #include "ivtv-udma.h"
27 #include "ivtv-irq.h"
28 #include "ivtv-vbi.h"
29 #include "ivtv-mailbox.h"
30 #include "ivtv-audio.h"
31 #include "ivtv-streams.h"
32 #include "ivtv-yuv.h"
33 #include "ivtv-controls.h"
34 #include "ivtv-ioctl.h"
35 #include "ivtv-cards.h"
36 #include <media/saa7115.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 streams are also automatically claimed.
41 Possible error returns: -EBUSY if someone else has claimed
42 the stream or 0 on success. */
43 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
44 {
45 struct ivtv *itv = id->itv;
46 struct ivtv_stream *s = &itv->streams[type];
47 struct ivtv_stream *s_vbi;
48 int vbi_type;
49
50 if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
51 /* someone already claimed this stream */
52 if (s->id == id->open_id) {
53 /* yes, this file descriptor did. So that's OK. */
54 return 0;
55 }
56 if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
57 type == IVTV_ENC_STREAM_TYPE_VBI)) {
58 /* VBI is handled already internally, now also assign
59 the file descriptor to this stream for external
60 reading of the stream. */
61 s->id = id->open_id;
62 IVTV_DEBUG_INFO("Start Read VBI\n");
63 return 0;
64 }
65 /* someone else is using this stream already */
66 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
67 return -EBUSY;
68 }
69 s->id = id->open_id;
70 if (type == IVTV_DEC_STREAM_TYPE_VBI) {
71 /* Enable reinsertion interrupt */
72 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
73 }
74
75 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
76 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
77 (provided VBI insertion is on and sliced VBI is selected), for all
78 other streams we're done */
79 if (type == IVTV_DEC_STREAM_TYPE_MPG) {
80 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
81 } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
82 itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
83 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
84 } else {
85 return 0;
86 }
87 s_vbi = &itv->streams[vbi_type];
88
89 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
90 /* Enable reinsertion interrupt */
91 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
92 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
93 }
94 /* mark that it is used internally */
95 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
96 return 0;
97 }
98
99 /* This function releases a previously claimed stream. It will take into
100 account associated VBI streams. */
101 void ivtv_release_stream(struct ivtv_stream *s)
102 {
103 struct ivtv *itv = s->itv;
104 struct ivtv_stream *s_vbi;
105
106 s->id = -1;
107 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
108 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
109 /* this stream is still in use internally */
110 return;
111 }
112 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
113 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
114 return;
115 }
116
117 ivtv_flush_queues(s);
118
119 /* disable reinsertion interrupt */
120 if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
121 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
122
123 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
124 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
125 for all other streams we're done */
126 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
127 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
128 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
129 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
130 else
131 return;
132
133 /* clear internal use flag */
134 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
135 /* was already cleared */
136 return;
137 }
138 if (s_vbi->id != -1) {
139 /* VBI stream still claimed by a file descriptor */
140 return;
141 }
142 /* disable reinsertion interrupt */
143 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
144 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
145 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
146 ivtv_flush_queues(s_vbi);
147 }
148
149 static void ivtv_dualwatch(struct ivtv *itv)
150 {
151 struct v4l2_tuner vt;
152 u16 new_bitmap;
153 u16 new_stereo_mode;
154 const u16 stereo_mask = 0x0300;
155 const u16 dual = 0x0200;
156
157 new_stereo_mode = itv->params.audio_properties & stereo_mask;
158 memset(&vt, 0, sizeof(vt));
159 ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
160 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
161 new_stereo_mode = dual;
162
163 if (new_stereo_mode == itv->dualwatch_stereo_mode)
164 return;
165
166 new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
167
168 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
169 itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
170
171 if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
172 itv->dualwatch_stereo_mode = new_stereo_mode;
173 return;
174 }
175 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
176 }
177
178 static void ivtv_update_pgm_info(struct ivtv *itv)
179 {
180 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
181 int cnt;
182 int i = 0;
183
184 if (wr_idx >= itv->pgm_info_num) {
185 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
186 return;
187 }
188 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
189 while (i < cnt) {
190 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
191 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
192 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
193 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
194 V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
195 // 1=I, 2=P, 4=B
196
197 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
198 if (e->offset > itv->mpg_data_received) {
199 break;
200 }
201 e->offset += itv->vbi_data_inserted;
202 e->length = read_enc(addr);
203 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
204 e->flags = mapping[read_enc(addr + 12) & 7];
205 i++;
206 }
207 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
208 }
209
210 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
211 {
212 struct ivtv *itv = s->itv;
213 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
214 struct ivtv_buffer *buf;
215 DEFINE_WAIT(wait);
216
217 *err = 0;
218 while (1) {
219 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
220 /* Process pending program info updates and pending VBI data */
221 ivtv_update_pgm_info(itv);
222
223 if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
224 itv->dualwatch_jiffies = jiffies;
225 ivtv_dualwatch(itv);
226 }
227
228 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
229 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
230 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
231 /* byteswap and process VBI data */
232 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
233 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
234 }
235 }
236 buf = &itv->vbi.sliced_mpeg_buf;
237 if (buf->readpos != buf->bytesused) {
238 return buf;
239 }
240 }
241
242 /* do we have leftover data? */
243 buf = ivtv_dequeue(s, &s->q_io);
244 if (buf)
245 return buf;
246
247 /* do we have new data? */
248 buf = ivtv_dequeue(s, &s->q_full);
249 if (buf) {
250 if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
251 return buf;
252 buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
253 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
254 /* byteswap MPG data */
255 ivtv_buf_swap(buf);
256 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
257 /* byteswap and process VBI data */
258 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
259 }
260 return buf;
261 }
262 /* return if file was opened with O_NONBLOCK */
263 if (non_block) {
264 *err = -EAGAIN;
265 return NULL;
266 }
267
268 /* return if end of stream */
269 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
270 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
271 IVTV_DEBUG_INFO("EOS %s\n", s->name);
272 return NULL;
273 }
274
275 /* wait for more data to arrive */
276 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
277 /* New buffers might have become available before we were added to the waitqueue */
278 if (!s->q_full.buffers)
279 schedule();
280 finish_wait(&s->waitq, &wait);
281 if (signal_pending(current)) {
282 /* return if a signal was received */
283 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
284 *err = -EINTR;
285 return NULL;
286 }
287 }
288 }
289
290 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
291 {
292 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
293
294 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
295 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
296 itv->vbi.sliced_mpeg_buf.readpos = 0;
297 }
298
299 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
300 char __user *ubuf, size_t ucount)
301 {
302 struct ivtv *itv = s->itv;
303 size_t len = buf->bytesused - buf->readpos;
304
305 if (len > ucount) len = ucount;
306 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
307 itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
308 const char *start = buf->buf + buf->readpos;
309 const char *p = start + 1;
310 const u8 *q;
311 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
312 int stuffing, i;
313
314 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
315 p = q + 1;
316 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
317 q[1] != 0 || q[2] != 1 || q[3] != ch) {
318 continue;
319 }
320 if (!itv->search_pack_header) {
321 if ((q[6] & 0xc0) != 0x80)
322 continue;
323 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
324 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
325 ch = 0xba;
326 itv->search_pack_header = 1;
327 p = q + 9;
328 }
329 continue;
330 }
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 && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
337 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
338 q[16 + stuffing] == 1) {
339 itv->search_pack_header = 0;
340 len = (char *)q - start;
341 ivtv_setup_sliced_vbi_buf(itv);
342 break;
343 }
344 }
345 }
346 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
347 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
348 return -EFAULT;
349 }
350 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
351 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
352 buf == &itv->vbi.sliced_mpeg_buf); */
353 buf->readpos += len;
354 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
355 itv->mpg_data_received += len;
356 return len;
357 }
358
359 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
360 {
361 struct ivtv *itv = s->itv;
362 size_t tot_written = 0;
363 int single_frame = 0;
364
365 if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
366 /* shouldn't happen */
367 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
368 return -EIO;
369 }
370
371 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
372 arrive one-by-one, so make sure we never output more than one VBI frame at a time */
373 if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
374 (s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
375 single_frame = 1;
376
377 for (;;) {
378 struct ivtv_buffer *buf;
379 int rc;
380
381 buf = ivtv_get_buffer(s, non_block, &rc);
382 if (buf == NULL && rc == -EAGAIN && tot_written)
383 break;
384 if (buf == NULL)
385 return rc;
386 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
387 if (buf != &itv->vbi.sliced_mpeg_buf) {
388 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
389 }
390 else if (buf->readpos == buf->bytesused) {
391 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
392 itv->vbi.sliced_mpeg_size[idx] = 0;
393 itv->vbi.inserted_frame++;
394 itv->vbi_data_inserted += buf->bytesused;
395 }
396 if (rc < 0)
397 return rc;
398 tot_written += rc;
399
400 if (tot_written == tot_count || single_frame)
401 break;
402 }
403 return tot_written;
404 }
405
406 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
407 loff_t *pos, int non_block)
408 {
409 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
410 struct ivtv *itv = s->itv;
411
412 IVTV_DEBUG_HI_INFO("read %zd from %s, got %zd\n", count, s->name, rc);
413 if (rc > 0)
414 pos += rc;
415 return rc;
416 }
417
418 int ivtv_start_capture(struct ivtv_open_id *id)
419 {
420 struct ivtv *itv = id->itv;
421 struct ivtv_stream *s = &itv->streams[id->type];
422 struct ivtv_stream *s_vbi;
423
424 if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
425 s->type == IVTV_DEC_STREAM_TYPE_MPG ||
426 s->type == IVTV_DEC_STREAM_TYPE_YUV ||
427 s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
428 /* you cannot read from these stream types. */
429 return -EPERM;
430 }
431
432 /* Try to claim this stream. */
433 if (ivtv_claim_stream(id, s->type))
434 return -EBUSY;
435
436 /* This stream does not need to start capturing */
437 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
438 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
439 return 0;
440 }
441
442 /* If capture is already in progress, then we also have to
443 do nothing extra. */
444 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
445 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
446 return 0;
447 }
448
449 /* Start VBI capture if required */
450 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
451 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
452 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
453 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
454 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
455 automatically when the MPG stream is claimed.
456 We only need to start the VBI capturing. */
457 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
458 IVTV_DEBUG_WARN("VBI capture start failed\n");
459
460 /* Failure, clean up and return an error */
461 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
462 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
463 /* also releases the associated VBI stream */
464 ivtv_release_stream(s);
465 return -EIO;
466 }
467 IVTV_DEBUG_INFO("VBI insertion started\n");
468 }
469
470 /* Tell the card to start capturing */
471 if (!ivtv_start_v4l2_encode_stream(s)) {
472 /* We're done */
473 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
474 /* Resume a possibly paused encoder */
475 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
476 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
477 return 0;
478 }
479
480 /* failure, clean up */
481 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
482
483 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
484 automatically when the MPG stream is released.
485 We only need to stop the VBI capturing. */
486 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
487 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
488 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
489 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
490 }
491 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
492 ivtv_release_stream(s);
493 return -EIO;
494 }
495
496 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
497 {
498 struct ivtv_open_id *id = filp->private_data;
499 struct ivtv *itv = id->itv;
500 struct ivtv_stream *s = &itv->streams[id->type];
501 int rc;
502
503 IVTV_DEBUG_HI_IOCTL("read %zd bytes from %s\n", count, s->name);
504
505 rc = ivtv_start_capture(id);
506 if (rc)
507 return rc;
508 return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
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
516 if (atomic_read(&itv->decoding) == 0) {
517 if (ivtv_claim_stream(id, s->type)) {
518 /* someone else is using this stream already */
519 IVTV_DEBUG_WARN("start decode, stream already claimed\n");
520 return -EBUSY;
521 }
522 ivtv_start_v4l2_decode_stream(s, 0);
523 }
524 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
525 return ivtv_set_speed(itv, speed);
526 return 0;
527 }
528
529 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
530 {
531 struct ivtv_open_id *id = filp->private_data;
532 struct ivtv *itv = id->itv;
533 struct ivtv_stream *s = &itv->streams[id->type];
534 struct ivtv_buffer *buf;
535 struct ivtv_queue q;
536 int bytes_written = 0;
537 int mode;
538 int rc;
539 DEFINE_WAIT(wait);
540
541 IVTV_DEBUG_HI_IOCTL("write %zd bytes to %s\n", count, s->name);
542
543 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
544 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
545 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
546 /* not decoder streams */
547 return -EPERM;
548
549 /* Try to claim this stream */
550 if (ivtv_claim_stream(id, s->type))
551 return -EBUSY;
552
553 /* This stream does not need to start any decoding */
554 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
555 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
556 return ivtv_write_vbi(itv, user_buf, count);
557 }
558
559 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
560
561 if (ivtv_set_output_mode(itv, mode) != mode) {
562 ivtv_release_stream(s);
563 return -EBUSY;
564 }
565 ivtv_queue_init(&q);
566 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
567
568 retry:
569 for (;;) {
570 /* Gather buffers */
571 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
572 ivtv_enqueue(s, buf, &q);
573 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
574 ivtv_enqueue(s, buf, &q);
575 }
576 if (q.buffers)
577 break;
578 if (filp->f_flags & O_NONBLOCK)
579 return -EAGAIN;
580 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
581 /* New buffers might have become free before we were added to the waitqueue */
582 if (!s->q_free.buffers)
583 schedule();
584 finish_wait(&s->waitq, &wait);
585 if (signal_pending(current)) {
586 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
587 return -EINTR;
588 }
589 }
590
591 /* copy user data into buffers */
592 while ((buf = ivtv_dequeue(s, &q))) {
593 /* Make sure we really got all the user data */
594 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
595
596 if (rc < 0) {
597 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
598 return rc;
599 }
600 user_buf += rc;
601 count -= rc;
602 bytes_written += rc;
603
604 if (buf->bytesused != s->buf_size) {
605 /* incomplete, leave in q_io for next time */
606 ivtv_enqueue(s, buf, &s->q_io);
607 break;
608 }
609 /* Byteswap MPEG buffer */
610 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
611 ivtv_buf_swap(buf);
612 ivtv_enqueue(s, buf, &s->q_full);
613 }
614
615 /* Start decoder (returns 0 if already started) */
616 rc = ivtv_start_decoding(id, itv->speed);
617 if (rc) {
618 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
619
620 /* failure, clean up */
621 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
622 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
623 return rc;
624 }
625 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
626 if (s->q_full.length >= itv->dma_data_req_size) {
627 int got_sig;
628
629 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
630 while (!(got_sig = signal_pending(current)) &&
631 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
632 schedule();
633 }
634 finish_wait(&itv->dma_waitq, &wait);
635 if (got_sig) {
636 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
637 return -EINTR;
638 }
639
640 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
641 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
642 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
643 }
644 }
645 /* more user data is available, wait until buffers become free
646 to transfer the rest. */
647 if (count && !(filp->f_flags & O_NONBLOCK))
648 goto retry;
649 IVTV_DEBUG_HI_INFO("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
650 return bytes_written;
651 }
652
653 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
654 {
655 struct ivtv_open_id *id = filp->private_data;
656 struct ivtv *itv = id->itv;
657 struct ivtv_stream *s = &itv->streams[id->type];
658 int res = 0;
659
660 /* add stream's waitq to the poll list */
661 poll_wait(filp, &s->waitq, wait);
662
663 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
664 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
665 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
666 res = POLLPRI;
667
668 /* Allow write if buffers are available for writing */
669 if (s->q_free.buffers)
670 res |= POLLOUT | POLLWRNORM;
671 return res;
672 }
673
674 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
675 {
676 struct ivtv_open_id *id = filp->private_data;
677 struct ivtv *itv = id->itv;
678 struct ivtv_stream *s = &itv->streams[id->type];
679 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
680
681 /* Start a capture if there is none */
682 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
683 int rc = ivtv_start_capture(id);
684
685 if (rc) {
686 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
687 s->name, rc);
688 return POLLERR;
689 }
690 }
691
692 /* add stream's waitq to the poll list */
693 poll_wait(filp, &s->waitq, wait);
694
695 if (eof || s->q_full.length)
696 return POLLIN | POLLRDNORM;
697 return 0;
698 }
699
700 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
701 {
702 struct ivtv *itv = id->itv;
703 struct ivtv_stream *s = &itv->streams[id->type];
704
705 IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
706
707 /* 'Unclaim' this stream */
708
709 /* Stop capturing */
710 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
711 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
712
713 IVTV_DEBUG_INFO("close stopping capture\n");
714 /* Special case: a running VBI capture for VBI insertion
715 in the mpeg stream. Need to stop that too. */
716 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
717 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
718 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
719 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
720 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
721 }
722 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
723 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
724 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
725 /* Also used internally, don't stop capturing */
726 s->id = -1;
727 }
728 else {
729 ivtv_stop_v4l2_encode_stream(s, gop_end);
730 }
731 }
732 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
733 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
734
735 ivtv_release_stream(s);
736 }
737
738 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
739 {
740 struct ivtv *itv = id->itv;
741 struct ivtv_stream *s = &itv->streams[id->type];
742
743 IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
744
745 /* Stop decoding */
746 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
747 IVTV_DEBUG_INFO("close stopping decode\n");
748
749 ivtv_stop_v4l2_decode_stream(s, flags, pts);
750 }
751 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
752 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
753 if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
754 /* Restore registers we've changed & clean up any mess we've made */
755 ivtv_yuv_close(itv);
756 }
757 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_YUV)
758 itv->output_mode = OUT_NONE;
759 else if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_UDMA_YUV)
760 itv->output_mode = OUT_NONE;
761 else if (s->type == IVTV_DEC_STREAM_TYPE_MPG && itv->output_mode == OUT_MPG)
762 itv->output_mode = OUT_NONE;
763
764 itv->speed = 0;
765 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
766 ivtv_release_stream(s);
767 }
768
769 int ivtv_v4l2_close(struct inode *inode, struct file *filp)
770 {
771 struct ivtv_open_id *id = filp->private_data;
772 struct ivtv *itv = id->itv;
773 struct ivtv_stream *s = &itv->streams[id->type];
774
775 IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
776
777 v4l2_prio_close(&itv->prio, &id->prio);
778
779 /* Easy case first: this stream was never claimed by us */
780 if (s->id != id->open_id) {
781 kfree(id);
782 return 0;
783 }
784
785 /* 'Unclaim' this stream */
786
787 /* Stop radio */
788 if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
789 /* Closing radio device, return to TV mode */
790 ivtv_mute(itv);
791 /* Mark that the radio is no longer in use */
792 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
793 /* Switch tuner to TV */
794 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
795 /* Select correct audio input (i.e. TV tuner or Line in) */
796 ivtv_audio_set_io(itv);
797 if (itv->hw_flags & IVTV_HW_SAA711X)
798 {
799 struct v4l2_crystal_freq crystal_freq;
800 crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
801 crystal_freq.flags = 0;
802 ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
803 }
804 /* Done! Unmute and continue. */
805 ivtv_unmute(itv);
806 ivtv_release_stream(s);
807 } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
808 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
809
810 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
811
812 /* If all output streams are closed, and if the user doesn't have
813 IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */
814 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
815 /* disable VBI on TV-out */
816 ivtv_disable_vbi(itv);
817 }
818 } else {
819 ivtv_stop_capture(id, 0);
820 }
821 kfree(id);
822 return 0;
823 }
824
825 int ivtv_v4l2_open(struct inode *inode, struct file *filp)
826 {
827 int x, y = 0;
828 struct ivtv_open_id *item;
829 struct ivtv *itv = NULL;
830 struct ivtv_stream *s = NULL;
831 int minor = iminor(inode);
832
833 /* Find which card this open was on */
834 spin_lock(&ivtv_cards_lock);
835 for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
836 /* find out which stream this open was on */
837 for (y = 0; y < IVTV_MAX_STREAMS; y++) {
838 s = &ivtv_cards[x]->streams[y];
839 if (s->v4l2dev && s->v4l2dev->minor == minor) {
840 itv = ivtv_cards[x];
841 break;
842 }
843 }
844 }
845 spin_unlock(&ivtv_cards_lock);
846
847 if (itv == NULL) {
848 /* Couldn't find a device registered
849 on that minor, shouldn't happen! */
850 IVTV_WARN("No ivtv device found on minor %d\n", minor);
851 return -ENXIO;
852 }
853
854 if (ivtv_init_on_first_open(itv)) {
855 IVTV_ERR("Failed to initialize on minor %d\n", minor);
856 return -ENXIO;
857 }
858
859 if (y == IVTV_DEC_STREAM_TYPE_MPG &&
860 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
861 return -EBUSY;
862
863 if (y == IVTV_DEC_STREAM_TYPE_YUV &&
864 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
865 return -EBUSY;
866
867 if (y == IVTV_DEC_STREAM_TYPE_YUV) {
868 if (read_reg(0x82c) == 0) {
869 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
870 /* return -ENODEV; */
871 }
872 ivtv_udma_alloc(itv);
873 }
874
875 /* Allocate memory */
876 item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
877 if (NULL == item) {
878 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
879 return -ENOMEM;
880 }
881 item->itv = itv;
882 item->type = y;
883 v4l2_prio_open(&itv->prio, &item->prio);
884
885 item->open_id = itv->open_id++;
886 filp->private_data = item;
887
888 if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
889 /* Try to claim this stream */
890 if (ivtv_claim_stream(item, item->type)) {
891 /* No, it's already in use */
892 kfree(item);
893 return -EBUSY;
894 }
895
896 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
897 if (atomic_read(&itv->capturing) > 0) {
898 /* switching to radio while capture is
899 in progress is not polite */
900 kfree(item);
901 return -EBUSY;
902 }
903 }
904 /* Mark that the radio is being used. */
905 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
906 /* We have the radio */
907 ivtv_mute(itv);
908 /* Switch tuner to radio */
909 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
910 /* Select the correct audio input (i.e. radio tuner) */
911 ivtv_audio_set_io(itv);
912 if (itv->hw_flags & IVTV_HW_SAA711X)
913 {
914 struct v4l2_crystal_freq crystal_freq;
915 crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
916 crystal_freq.flags = SAA7115_FREQ_FL_APLL;
917 ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
918 }
919 /* Done! Unmute and continue. */
920 ivtv_unmute(itv);
921 }
922
923 /* YUV or MPG Decoding Mode? */
924 if (y == IVTV_DEC_STREAM_TYPE_MPG)
925 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
926 else if (y == IVTV_DEC_STREAM_TYPE_YUV)
927 {
928 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
929 }
930
931 return 0;
932 }
933
934 void ivtv_mute(struct ivtv *itv)
935 {
936 if (atomic_read(&itv->capturing))
937 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
938 IVTV_DEBUG_INFO("Mute\n");
939 }
940
941 void ivtv_unmute(struct ivtv *itv)
942 {
943 if (atomic_read(&itv->capturing)) {
944 ivtv_msleep_timeout(100, 0);
945 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
946 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
947 }
948 IVTV_DEBUG_INFO("Unmute\n");
949 }
AMDTP streaming driver for the Linux FireWire stack (Juju)