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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / media / video / ivtv / ivtv-fileops.c
blob1637097ddec742c68ddbf2d17be485855c2b4be8
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
36 /* This function tries to claim the stream for a specific file descriptor.
37 If no one else is using this stream then the stream is claimed and
38 associated VBI streams are also automatically claimed.
39 Possible error returns: -EBUSY if someone else has claimed
40 the stream or 0 on success. */
41 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
42 {
43 struct ivtv *itv = id->itv;
44 struct ivtv_stream *s = &itv->streams[type];
45 struct ivtv_stream *s_vbi;
46 int vbi_type;
47
48 if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
49 /* someone already claimed this stream */
50 if (s->id == id->open_id) {
51 /* yes, this file descriptor did. So that's OK. */
52 return 0;
53 }
54 if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
55 type == IVTV_ENC_STREAM_TYPE_VBI)) {
56 /* VBI is handled already internally, now also assign
57 the file descriptor to this stream for external
58 reading of the stream. */
59 s->id = id->open_id;
60 IVTV_DEBUG_INFO("Start Read VBI\n");
61 return 0;
62 }
63 /* someone else is using this stream already */
64 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
65 return -EBUSY;
66 }
67 s->id = id->open_id;
68 if (type == IVTV_DEC_STREAM_TYPE_VBI) {
69 /* Enable reinsertion interrupt */
70 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
71 }
72
73 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
74 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
75 (provided VBI insertion is on and sliced VBI is selected), for all
76 other streams we're done */
77 if (type == IVTV_DEC_STREAM_TYPE_MPG) {
78 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
79 } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
80 itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
81 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
82 } else {
83 return 0;
84 }
85 s_vbi = &itv->streams[vbi_type];
86
87 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
88 /* Enable reinsertion interrupt */
89 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
90 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
91 }
92 /* mark that it is used internally */
93 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
94 return 0;
95 }
96
97 /* This function releases a previously claimed stream. It will take into
98 account associated VBI streams. */
99 void ivtv_release_stream(struct ivtv_stream *s)
100 {
101 struct ivtv *itv = s->itv;
102 struct ivtv_stream *s_vbi;
103
104 s->id = -1;
105 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
106 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
107 /* this stream is still in use internally */
108 return;
109 }
110 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
111 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
112 return;
113 }
114
115 ivtv_flush_queues(s);
116
117 /* disable reinsertion interrupt */
118 if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
119 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
120
121 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
122 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
123 for all other streams we're done */
124 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
125 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
126 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
127 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
128 else
129 return;
130
131 /* clear internal use flag */
132 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
133 /* was already cleared */
134 return;
135 }
136 if (s_vbi->id != -1) {
137 /* VBI stream still claimed by a file descriptor */
138 return;
139 }
140 /* disable reinsertion interrupt */
141 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
142 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
143 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
144 ivtv_flush_queues(s_vbi);
145 }
146
147 static void ivtv_dualwatch(struct ivtv *itv)
148 {
149 struct v4l2_tuner vt;
150 u16 new_bitmap;
151 u16 new_stereo_mode;
152 const u16 stereo_mask = 0x0300;
153 const u16 dual = 0x0200;
154
155 new_stereo_mode = itv->params.audio_properties & stereo_mask;
156 memset(&vt, 0, sizeof(vt));
157 ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
158 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
159 new_stereo_mode = dual;
160
161 if (new_stereo_mode == itv->dualwatch_stereo_mode)
162 return;
163
164 new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
165
166 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
167 itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
168
169 if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
170 itv->dualwatch_stereo_mode = new_stereo_mode;
171 return;
172 }
173 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
174 }
175
176 static void ivtv_update_pgm_info(struct ivtv *itv)
177 {
178 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
179 int cnt;
180 int i = 0;
181
182 if (wr_idx >= itv->pgm_info_num) {
183 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
184 return;
185 }
186 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
187 while (i < cnt) {
188 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
189 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
190 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
191 const int mapping[] = { V4L2_ENC_IDX_FRAME_P, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_B, 0 };
192
193 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
194 if (e->offset > itv->mpg_data_received) {
195 break;
196 }
197 e->offset += itv->vbi_data_inserted;
198 e->length = read_enc(addr);
199 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
200 e->flags = mapping[read_enc(addr + 12) & 3];
201 i++;
202 }
203 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
204 }
205
206 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
207 {
208 struct ivtv *itv = s->itv;
209 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
210 struct ivtv_buffer *buf;
211 DEFINE_WAIT(wait);
212
213 *err = 0;
214 while (1) {
215 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
216 /* Process pending program info updates and pending VBI data */
217 ivtv_update_pgm_info(itv);
218
219 if (jiffies - itv->dualwatch_jiffies > HZ) {
220 itv->dualwatch_jiffies = jiffies;
221 ivtv_dualwatch(itv);
222 }
223
224 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
225 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
226 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
227 /* byteswap and process VBI data */
228 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
229 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
230 }
231 }
232 buf = &itv->vbi.sliced_mpeg_buf;
233 if (buf->readpos != buf->bytesused) {
234 return buf;
235 }
236 }
237
238 /* do we have leftover data? */
239 buf = ivtv_dequeue(s, &s->q_io);
240 if (buf)
241 return buf;
242
243 /* do we have new data? */
244 buf = ivtv_dequeue(s, &s->q_full);
245 if (buf) {
246 if (!test_and_clear_bit(IVTV_F_B_NEED_BUF_SWAP, &buf->b_flags))
247 return buf;
248 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
249 /* byteswap MPG data */
250 ivtv_buf_swap(buf);
251 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
252 /* byteswap and process VBI data */
253 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
254 }
255 return buf;
256 }
257 /* return if file was opened with O_NONBLOCK */
258 if (non_block) {
259 *err = -EAGAIN;
260 return NULL;
261 }
262
263 /* return if end of stream */
264 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
265 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
266 IVTV_DEBUG_INFO("EOS %s\n", s->name);
267 return NULL;
268 }
269
270 /* wait for more data to arrive */
271 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
272 /* New buffers might have become available before we were added to the waitqueue */
273 if (!s->q_full.buffers)
274 schedule();
275 finish_wait(&s->waitq, &wait);
276 if (signal_pending(current)) {
277 /* return if a signal was received */
278 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
279 *err = -EINTR;
280 return NULL;
281 }
282 }
283 }
284
285 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
286 {
287 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
288
289 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
290 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
291 itv->vbi.sliced_mpeg_buf.readpos = 0;
292 }
293
294 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
295 char __user *ubuf, size_t ucount)
296 {
297 struct ivtv *itv = s->itv;
298 size_t len = buf->bytesused - buf->readpos;
299
300 if (len > ucount) len = ucount;
301 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
302 itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
303 const char *start = buf->buf + buf->readpos;
304 const char *p = start + 1;
305 const u8 *q;
306 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
307 int stuffing, i;
308
309 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
310 p = q + 1;
311 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
312 q[1] != 0 || q[2] != 1 || q[3] != ch) {
313 continue;
314 }
315 if (!itv->search_pack_header) {
316 if ((q[6] & 0xc0) != 0x80)
317 continue;
318 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
319 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
320 ch = 0xba;
321 itv->search_pack_header = 1;
322 p = q + 9;
323 }
324 continue;
325 }
326 stuffing = q[13] & 7;
327 /* all stuffing bytes must be 0xff */
328 for (i = 0; i < stuffing; i++)
329 if (q[14 + i] != 0xff)
330 break;
331 if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
332 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
333 q[16 + stuffing] == 1) {
334 itv->search_pack_header = 0;
335 len = (char *)q - start;
336 ivtv_setup_sliced_vbi_buf(itv);
337 break;
338 }
339 }
340 }
341 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
342 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
343 return -EFAULT;
344 }
345 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
346 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
347 buf == &itv->vbi.sliced_mpeg_buf); */
348 buf->readpos += len;
349 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
350 itv->mpg_data_received += len;
351 return len;
352 }
353
354 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
355 {
356 struct ivtv *itv = s->itv;
357 size_t tot_written = 0;
358 int single_frame = 0;
359
360 if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
361 /* shouldn't happen */
362 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
363 return -EIO;
364 }
365
366 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
367 arrive one-by-one, so make sure we never output more than one VBI frame at a time */
368 if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
369 (s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
370 single_frame = 1;
371
372 for (;;) {
373 struct ivtv_buffer *buf;
374 int rc;
375
376 buf = ivtv_get_buffer(s, non_block, &rc);
377 if (buf == NULL && rc == -EAGAIN && tot_written)
378 break;
379 if (buf == NULL)
380 return rc;
381 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
382 if (buf != &itv->vbi.sliced_mpeg_buf) {
383 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
384 }
385 else if (buf->readpos == buf->bytesused) {
386 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
387 itv->vbi.sliced_mpeg_size[idx] = 0;
388 itv->vbi.inserted_frame++;
389 itv->vbi_data_inserted += buf->bytesused;
390 }
391 if (rc < 0)
392 return rc;
393 tot_written += rc;
394
395 if (tot_written == tot_count || single_frame)
396 break;
397 }
398 return tot_written;
399 }
400
401 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
402 loff_t *pos, int non_block)
403 {
404 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
405 struct ivtv *itv = s->itv;
406
407 IVTV_DEBUG_INFO("read %zd from %s, got %zd\n", count, s->name, rc);
408 if (rc > 0)
409 pos += rc;
410 return rc;
411 }
412
413 int ivtv_start_capture(struct ivtv_open_id *id)
414 {
415 struct ivtv *itv = id->itv;
416 struct ivtv_stream *s = &itv->streams[id->type];
417 struct ivtv_stream *s_vbi;
418
419 if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
420 s->type == IVTV_DEC_STREAM_TYPE_MPG ||
421 s->type == IVTV_DEC_STREAM_TYPE_YUV ||
422 s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
423 /* you cannot read from these stream types. */
424 return -EPERM;
425 }
426
427 /* Try to claim this stream. */
428 if (ivtv_claim_stream(id, s->type))
429 return -EBUSY;
430
431 /* This stream does not need to start capturing */
432 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
433 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
434 return 0;
435 }
436
437 /* If capture is already in progress, then we also have to
438 do nothing extra. */
439 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
440 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
441 return 0;
442 }
443
444 /* Start VBI capture if required */
445 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
446 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
447 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
448 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
449 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
450 automatically when the MPG stream is claimed.
451 We only need to start the VBI capturing. */
452 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
453 IVTV_DEBUG_WARN("VBI capture start failed\n");
454
455 /* Failure, clean up and return an error */
456 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
457 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
458 /* also releases the associated VBI stream */
459 ivtv_release_stream(s);
460 return -EIO;
461 }
462 IVTV_DEBUG_INFO("VBI insertion started\n");
463 }
464
465 /* Tell the card to start capturing */
466 if (!ivtv_start_v4l2_encode_stream(s)) {
467 /* We're done */
468 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
469 /* Resume a possibly paused encoder */
470 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
471 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
472 return 0;
473 }
474
475 /* failure, clean up */
476 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
477
478 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
479 automatically when the MPG stream is released.
480 We only need to stop the VBI capturing. */
481 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
482 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
483 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
484 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
485 }
486 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
487 ivtv_release_stream(s);
488 return -EIO;
489 }
490
491 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
492 {
493 struct ivtv_open_id *id = filp->private_data;
494 struct ivtv *itv = id->itv;
495 struct ivtv_stream *s = &itv->streams[id->type];
496 int rc;
497
498 IVTV_DEBUG_IOCTL("read %zd bytes from %s\n", count, s->name);
499
500 rc = ivtv_start_capture(id);
501 if (rc)
502 return rc;
503 return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
504 }
505
506 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
507 {
508 struct ivtv *itv = id->itv;
509 struct ivtv_stream *s = &itv->streams[id->type];
510
511 if (atomic_read(&itv->decoding) == 0) {
512 if (ivtv_claim_stream(id, s->type)) {
513 /* someone else is using this stream already */
514 IVTV_DEBUG_WARN("start decode, stream already claimed\n");
515 return -EBUSY;
516 }
517 ivtv_start_v4l2_decode_stream(s, 0);
518 }
519 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
520 return ivtv_set_speed(itv, speed);
521 return 0;
522 }
523
524 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
525 {
526 struct ivtv_open_id *id = filp->private_data;
527 struct ivtv *itv = id->itv;
528 struct ivtv_stream *s = &itv->streams[id->type];
529 struct ivtv_buffer *buf;
530 struct ivtv_queue q;
531 int bytes_written = 0;
532 int mode;
533 int rc;
534 DEFINE_WAIT(wait);
535
536 IVTV_DEBUG_IOCTL("write %zd bytes to %s\n", count, s->name);
537
538 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
539 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
540 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
541 /* not decoder streams */
542 return -EPERM;
543
544 /* Try to claim this stream */
545 if (ivtv_claim_stream(id, s->type))
546 return -EBUSY;
547
548 /* This stream does not need to start any decoding */
549 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
550 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
551 return ivtv_write_vbi(itv, user_buf, count);
552 }
553
554 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
555
556 if (ivtv_set_output_mode(itv, mode) != mode) {
557 ivtv_release_stream(s);
558 return -EBUSY;
559 }
560 ivtv_queue_init(&q);
561 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
562
563 retry:
564 for (;;) {
565 /* Gather buffers */
566 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
567 ivtv_enqueue(s, buf, &q);
568 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
569 ivtv_enqueue(s, buf, &q);
570 }
571 if (q.buffers)
572 break;
573 if (filp->f_flags & O_NONBLOCK)
574 return -EAGAIN;
575 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
576 /* New buffers might have become free before we were added to the waitqueue */
577 if (!s->q_free.buffers)
578 schedule();
579 finish_wait(&s->waitq, &wait);
580 if (signal_pending(current)) {
581 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
582 return -EINTR;
583 }
584 }
585
586 /* copy user data into buffers */
587 while ((buf = ivtv_dequeue(s, &q))) {
588 /* Make sure we really got all the user data */
589 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
590
591 if (rc < 0) {
592 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
593 return rc;
594 }
595 user_buf += rc;
596 count -= rc;
597 bytes_written += rc;
598
599 if (buf->bytesused != s->buf_size) {
600 /* incomplete, leave in q_io for next time */
601 ivtv_enqueue(s, buf, &s->q_io);
602 break;
603 }
604 /* Byteswap MPEG buffer */
605 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
606 ivtv_buf_swap(buf);
607 ivtv_enqueue(s, buf, &s->q_full);
608 }
609
610 /* Start decoder (returns 0 if already started) */
611 rc = ivtv_start_decoding(id, itv->speed);
612 if (rc) {
613 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
614
615 /* failure, clean up */
616 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
617 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
618 return rc;
619 }
620 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
621 if (s->q_full.length >= itv->dma_data_req_size) {
622 int got_sig;
623
624 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
625 while (!(got_sig = signal_pending(current)) &&
626 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
627 schedule();
628 }
629 finish_wait(&itv->dma_waitq, &wait);
630 if (got_sig) {
631 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
632 return -EINTR;
633 }
634
635 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
636 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
637 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
638 }
639 }
640 /* more user data is available, wait until buffers become free
641 to transfer the rest. */
642 if (count && !(filp->f_flags & O_NONBLOCK))
643 goto retry;
644 IVTV_DEBUG_INFO("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
645 return bytes_written;
646 }
647
648 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
649 {
650 struct ivtv_open_id *id = filp->private_data;
651 struct ivtv *itv = id->itv;
652 struct ivtv_stream *s = &itv->streams[id->type];
653 int res = 0;
654
655 /* add stream's waitq to the poll list */
656 poll_wait(filp, &s->waitq, wait);
657
658 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
659 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
660 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
661 res = POLLPRI;
662
663 /* Allow write if buffers are available for writing */
664 if (s->q_free.buffers)
665 res |= POLLOUT | POLLWRNORM;
666 return res;
667 }
668
669 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
670 {
671 struct ivtv_open_id *id = filp->private_data;
672 struct ivtv *itv = id->itv;
673 struct ivtv_stream *s = &itv->streams[id->type];
674 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
675
676 /* Start a capture if there is none */
677 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
678 int rc = ivtv_start_capture(id);
679
680 if (rc) {
681 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
682 s->name, rc);
683 return POLLERR;
684 }
685 }
686
687 /* add stream's waitq to the poll list */
688 poll_wait(filp, &s->waitq, wait);
689
690 if (eof || s->q_full.length)
691 return POLLIN | POLLRDNORM;
692 return 0;
693 }
694
695 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
696 {
697 struct ivtv *itv = id->itv;
698 struct ivtv_stream *s = &itv->streams[id->type];
699
700 IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
701
702 /* 'Unclaim' this stream */
703
704 /* Stop capturing */
705 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
706 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
707
708 IVTV_DEBUG_INFO("close stopping capture\n");
709 /* Special case: a running VBI capture for VBI insertion
710 in the mpeg stream. Need to stop that too. */
711 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
712 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
713 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
714 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
715 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
716 }
717 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
718 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
719 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
720 /* Also used internally, don't stop capturing */
721 s->id = -1;
722 }
723 else {
724 ivtv_stop_v4l2_encode_stream(s, gop_end);
725 }
726 }
727 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
728 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
729
730 ivtv_release_stream(s);
731 }
732
733 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
734 {
735 struct ivtv *itv = id->itv;
736 struct ivtv_stream *s = &itv->streams[id->type];
737
738 IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
739
740 /* Stop decoding */
741 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
742 IVTV_DEBUG_INFO("close stopping decode\n");
743
744 ivtv_stop_v4l2_decode_stream(s, flags, pts);
745 }
746 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
747 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
748 if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
749 /* Restore registers we've changed & clean up any mess we've made */
750 ivtv_yuv_close(itv);
751 }
752 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_YUV)
753 itv->output_mode = OUT_NONE;
754 else if (s->type == IVTV_DEC_STREAM_TYPE_MPG && itv->output_mode == OUT_MPG)
755 itv->output_mode = OUT_NONE;
756
757 itv->speed = 0;
758 ivtv_release_stream(s);
759 }
760
761 int ivtv_v4l2_close(struct inode *inode, struct file *filp)
762 {
763 struct ivtv_open_id *id = filp->private_data;
764 struct ivtv *itv = id->itv;
765 struct ivtv_stream *s = &itv->streams[id->type];
766
767 IVTV_DEBUG_IOCTL("close() of %s\n", s->name);
768
769 v4l2_prio_close(&itv->prio, &id->prio);
770
771 /* Easy case first: this stream was never claimed by us */
772 if (s->id != id->open_id) {
773 kfree(id);
774 return 0;
775 }
776
777 /* 'Unclaim' this stream */
778
779 /* Stop radio */
780 if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
781 /* Closing radio device, return to TV mode */
782 ivtv_mute(itv);
783 /* Mark that the radio is no longer in use */
784 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
785 /* Switch tuner to TV */
786 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
787 /* Select correct audio input (i.e. TV tuner or Line in) */
788 ivtv_audio_set_io(itv);
789 /* Done! Unmute and continue. */
790 ivtv_unmute(itv);
791 ivtv_release_stream(s);
792 } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
793 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
794 } else {
795 ivtv_stop_capture(id, 0);
796 }
797 kfree(id);
798 return 0;
799 }
800
801 int ivtv_v4l2_open(struct inode *inode, struct file *filp)
802 {
803 int x, y = 0;
804 struct ivtv_open_id *item;
805 struct ivtv *itv = NULL;
806 struct ivtv_stream *s = NULL;
807 int minor = MINOR(inode->i_rdev);
808
809 /* Find which card this open was on */
810 spin_lock(&ivtv_cards_lock);
811 for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
812 /* find out which stream this open was on */
813 for (y = 0; y < IVTV_MAX_STREAMS; y++) {
814 s = &ivtv_cards[x]->streams[y];
815 if (s->v4l2dev && s->v4l2dev->minor == minor) {
816 itv = ivtv_cards[x];
817 break;
818 }
819 }
820 }
821 spin_unlock(&ivtv_cards_lock);
822
823 if (itv == NULL) {
824 /* Couldn't find a device registered
825 on that minor, shouldn't happen! */
826 printk(KERN_WARNING "ivtv: no ivtv device found on minor %d\n", minor);
827 return -ENXIO;
828 }
829
830 if (y == IVTV_DEC_STREAM_TYPE_MPG &&
831 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
832 return -EBUSY;
833
834 if (y == IVTV_DEC_STREAM_TYPE_YUV &&
835 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
836 return -EBUSY;
837
838 if (y == IVTV_DEC_STREAM_TYPE_YUV) {
839 if (read_reg(0x82c) == 0) {
840 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
841 /* return -ENODEV; */
842 }
843 ivtv_udma_alloc(itv);
844 }
845
846 /* Allocate memory */
847 item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
848 if (NULL == item) {
849 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
850 return -ENOMEM;
851 }
852 item->itv = itv;
853 item->type = y;
854 v4l2_prio_open(&itv->prio, &item->prio);
855
856 item->open_id = itv->open_id++;
857 filp->private_data = item;
858
859 if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
860 /* Try to claim this stream */
861 if (ivtv_claim_stream(item, item->type)) {
862 /* No, it's already in use */
863 kfree(item);
864 return -EBUSY;
865 }
866
867 /* We have the radio */
868 ivtv_mute(itv);
869 /* Switch tuner to radio */
870 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
871 /* Mark that the radio is being used. */
872 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
873 /* Select the correct audio input (i.e. radio tuner) */
874 ivtv_audio_set_io(itv);
875 /* Done! Unmute and continue. */
876 ivtv_unmute(itv);
877 }
878
879 /* YUV or MPG Decoding Mode? */
880 if (y == IVTV_DEC_STREAM_TYPE_MPG)
881 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
882 else if (y == IVTV_DEC_STREAM_TYPE_YUV)
883 {
884 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
885 }
886
887 return 0;
888 }
889
890 void ivtv_mute(struct ivtv *itv)
891 {
892 struct v4l2_control ctrl = { V4L2_CID_AUDIO_MUTE, 1 };
893
894 /* Mute sound to avoid pop */
895 ivtv_control_ioctls(itv, VIDIOC_S_CTRL, &ctrl);
896
897 if (atomic_read(&itv->capturing))
898 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
899
900 IVTV_DEBUG_INFO("Mute\n");
901 }
902
903 void ivtv_unmute(struct ivtv *itv)
904 {
905 struct v4l2_control ctrl = { V4L2_CID_AUDIO_MUTE, 0 };
906
907 /* initialize or refresh input */
908 if (atomic_read(&itv->capturing) == 0)
909 ivtv_vapi(itv, CX2341X_ENC_INITIALIZE_INPUT, 0);
910
911 ivtv_sleep_timeout(HZ / 10, 0);
912
913 if (atomic_read(&itv->capturing)) {
914 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
915 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
916 }
917
918 /* Unmute */
919 ivtv_control_ioctls(itv, VIDIOC_S_CTRL, &ctrl);
920 IVTV_DEBUG_INFO("Unmute\n");
921 }
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