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Merge with Linux 2.4.0-test6-pre9.
[linux-2.6/linux-mips.git] / drivers / sound / dmabuf.c
blobb46d4e086b24a0a71ced62293bbd21b8ec0b1ca9
1 /*
2 * sound/dmabuf.c
3 *
4 * The DMA buffer manager for digitized voice applications
5 */
6 /*
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
11 * for more info.
12 *
13 * Thomas Sailer : moved several static variables into struct audio_operations
14 * (which is grossly misnamed btw.) because they have the same
15 * lifetime as the rest in there and dynamic allocation saves
16 * 12k or so
17 * Thomas Sailer : remove {in,out}_sleep_flag. It was used for the sleeper to
18 * determine if it was woken up by the expiring timeout or by
19 * an explicit wake_up. The return value from schedule_timeout
20 * can be used instead; if 0, the wakeup was due to the timeout.
21 *
22 * Rob Riggs Added persistent DMA buffers (1998/10/17)
23 */
24
25 #define BE_CONSERVATIVE
26 #define SAMPLE_ROUNDUP 0
27
28 #include "sound_config.h"
29 #include <linux/wrapper.h>
30
31 #define DMAP_FREE_ON_CLOSE 0
32 #define DMAP_KEEP_ON_CLOSE 1
33 extern int sound_dmap_flag;
34
35 static void dma_reset_output(int dev);
36 static void dma_reset_input(int dev);
37 static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);
38
39
40
41 static int debugmem = 0; /* switched off by default */
42 static int dma_buffsize = DSP_BUFFSIZE;
43
44 static long dmabuf_timeout(struct dma_buffparms *dmap)
45 {
46 long tmout;
47
48 tmout = (dmap->fragment_size * HZ) / dmap->data_rate;
49 tmout += HZ / 5; /* Some safety distance */
50 if (tmout < (HZ / 2))
51 tmout = HZ / 2;
52 if (tmout > 20 * HZ)
53 tmout = 20 * HZ;
54 return tmout;
55 }
56
57 static int sound_alloc_dmap(struct dma_buffparms *dmap)
58 {
59 char *start_addr, *end_addr;
60 int dma_pagesize;
61 int sz, size;
62 struct page *page;
63
64 dmap->mapping_flags &= ~DMA_MAP_MAPPED;
65
66 if (dmap->raw_buf != NULL)
67 return 0; /* Already done */
68 if (dma_buffsize < 4096)
69 dma_buffsize = 4096;
70 dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
71
72 /*
73 * Now check for the Cyrix problem.
74 */
75
76 if(isa_dma_bridge_buggy==2)
77 dma_pagesize=32768;
78
79 dmap->raw_buf = NULL;
80 dmap->buffsize = dma_buffsize;
81 if (dmap->buffsize > dma_pagesize)
82 dmap->buffsize = dma_pagesize;
83 start_addr = NULL;
84 /*
85 * Now loop until we get a free buffer. Try to get smaller buffer if
86 * it fails. Don't accept smaller than 8k buffer for performance
87 * reasons.
88 */
89 while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
90 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
91 dmap->buffsize = PAGE_SIZE * (1 << sz);
92 start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA, sz);
93 if (start_addr == NULL)
94 dmap->buffsize /= 2;
95 }
96
97 if (start_addr == NULL) {
98 printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n");
99 return -ENOMEM;
100 } else {
101 /* make some checks */
102 end_addr = start_addr + dmap->buffsize - 1;
103
104 if (debugmem)
105 printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr);
106
107 /* now check if it fits into the same dma-pagesize */
108
109 if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
110 || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
111 printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize);
112 return -EFAULT;
113 }
114 }
115 dmap->raw_buf = start_addr;
116 dmap->raw_buf_phys = virt_to_bus(start_addr);
117
118 for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
119 mem_map_reserve(page);
120 return 0;
121 }
122
123 static void sound_free_dmap(struct dma_buffparms *dmap)
124 {
125 int sz, size;
126 struct page *page;
127 unsigned long start_addr, end_addr;
128
129 if (dmap->raw_buf == NULL)
130 return;
131 if (dmap->mapping_flags & DMA_MAP_MAPPED)
132 return; /* Don't free mmapped buffer. Will use it next time */
133 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
134
135 start_addr = (unsigned long) dmap->raw_buf;
136 end_addr = start_addr + dmap->buffsize;
137
138 for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
139 mem_map_unreserve(page);
140
141 free_pages((unsigned long) dmap->raw_buf, sz);
142 dmap->raw_buf = NULL;
143 }
144
145
146 /* Intel version !!!!!!!!! */
147
148 static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
149 {
150 unsigned long flags;
151 int chan = dmap->dma;
152
153 /* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */
154
155 flags = claim_dma_lock();
156 disable_dma(chan);
157 clear_dma_ff(chan);
158 set_dma_mode(chan, dma_mode);
159 set_dma_addr(chan, physaddr);
160 set_dma_count(chan, count);
161 enable_dma(chan);
162 release_dma_lock(flags);
163
164 return 0;
165 }
166
167 static void dma_init_buffers(struct dma_buffparms *dmap)
168 {
169 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
170 dmap->byte_counter = 0;
171 dmap->max_byte_counter = 8000 * 60 * 60;
172 dmap->bytes_in_use = dmap->buffsize;
173
174 dmap->dma_mode = DMODE_NONE;
175 dmap->mapping_flags = 0;
176 dmap->neutral_byte = 0x80;
177 dmap->data_rate = 8000;
178 dmap->cfrag = -1;
179 dmap->closing = 0;
180 dmap->nbufs = 1;
181 dmap->flags = DMA_BUSY; /* Other flags off */
182 }
183
184 static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
185 {
186 int err;
187
188 if (dmap->flags & DMA_BUSY)
189 return -EBUSY;
190 if ((err = sound_alloc_dmap(dmap)) < 0)
191 return err;
192
193 if (dmap->raw_buf == NULL) {
194 printk(KERN_WARNING "Sound: DMA buffers not available\n");
195 return -ENOSPC; /* Memory allocation failed during boot */
196 }
197 if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
198 printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
199 return -EBUSY;
200 }
201 dma_init_buffers(dmap);
202 dmap->open_mode = mode;
203 dmap->subdivision = dmap->underrun_count = 0;
204 dmap->fragment_size = 0;
205 dmap->max_fragments = 65536; /* Just a large value */
206 dmap->byte_counter = 0;
207 dmap->max_byte_counter = 8000 * 60 * 60;
208 dmap->applic_profile = APF_NORMAL;
209 dmap->needs_reorg = 1;
210 dmap->audio_callback = NULL;
211 dmap->callback_parm = 0;
212 return 0;
213 }
214
215 static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
216 {
217 unsigned long flags;
218
219 if (dmap->dma >= 0) {
220 sound_close_dma(dmap->dma);
221 flags=claim_dma_lock();
222 disable_dma(dmap->dma);
223 release_dma_lock(flags);
224 }
225 if (dmap->flags & DMA_BUSY)
226 dmap->dma_mode = DMODE_NONE;
227 dmap->flags &= ~DMA_BUSY;
228
229 if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
230 sound_free_dmap(dmap);
231 }
232
233
234 static unsigned int default_set_bits(int dev, unsigned int bits)
235 {
236 mm_segment_t fs = get_fs();
237
238 set_fs(get_ds());
239 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (caddr_t)&bits);
240 set_fs(fs);
241 return bits;
242 }
243
244 static int default_set_speed(int dev, int speed)
245 {
246 mm_segment_t fs = get_fs();
247
248 set_fs(get_ds());
249 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (caddr_t)&speed);
250 set_fs(fs);
251 return speed;
252 }
253
254 static short default_set_channels(int dev, short channels)
255 {
256 int c = channels;
257 mm_segment_t fs = get_fs();
258
259 set_fs(get_ds());
260 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (caddr_t)&c);
261 set_fs(fs);
262 return c;
263 }
264
265 static void check_driver(struct audio_driver *d)
266 {
267 if (d->set_speed == NULL)
268 d->set_speed = default_set_speed;
269 if (d->set_bits == NULL)
270 d->set_bits = default_set_bits;
271 if (d->set_channels == NULL)
272 d->set_channels = default_set_channels;
273 }
274
275 int DMAbuf_open(int dev, int mode)
276 {
277 struct audio_operations *adev = audio_devs[dev];
278 int retval;
279 struct dma_buffparms *dmap_in = NULL;
280 struct dma_buffparms *dmap_out = NULL;
281
282 if (!adev)
283 return -ENXIO;
284 if (!(adev->flags & DMA_DUPLEX))
285 adev->dmap_in = adev->dmap_out;
286 check_driver(adev->d);
287
288 if ((retval = adev->d->open(dev, mode)) < 0)
289 return retval;
290 dmap_out = adev->dmap_out;
291 dmap_in = adev->dmap_in;
292 if (dmap_in == dmap_out)
293 adev->flags &= ~DMA_DUPLEX;
294
295 if (mode & OPEN_WRITE) {
296 if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
297 adev->d->close(dev);
298 return retval;
299 }
300 }
301 adev->enable_bits = mode;
302
303 if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
304 if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
305 adev->d->close(dev);
306 if (mode & OPEN_WRITE)
307 close_dmap(adev, dmap_out);
308 return retval;
309 }
310 }
311 adev->open_mode = mode;
312 adev->go = 1;
313
314 adev->d->set_bits(dev, 8);
315 adev->d->set_channels(dev, 1);
316 adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
317 if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
318 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
319 adev->dmap_out->bytes_in_use);
320 return 0;
321 }
322
323 void DMAbuf_reset(int dev)
324 {
325 if (audio_devs[dev]->open_mode & OPEN_WRITE)
326 dma_reset_output(dev);
327
328 if (audio_devs[dev]->open_mode & OPEN_READ)
329 dma_reset_input(dev);
330 }
331
332 static void dma_reset_output(int dev)
333 {
334 struct audio_operations *adev = audio_devs[dev];
335 unsigned long flags,f ;
336 struct dma_buffparms *dmap = adev->dmap_out;
337
338 if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */
339 return;
340
341 /*
342 * First wait until the current fragment has been played completely
343 */
344 save_flags(flags);
345 cli();
346 adev->dmap_out->flags |= DMA_SYNCING;
347
348 adev->dmap_out->underrun_count = 0;
349 if (!signal_pending(current) && adev->dmap_out->qlen &&
350 adev->dmap_out->underrun_count == 0)
351 interruptible_sleep_on_timeout(&adev->out_sleeper,
352 dmabuf_timeout(dmap));
353 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
354
355 /*
356 * Finally shut the device off
357 */
358 if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
359 adev->d->halt_io(dev);
360 else
361 adev->d->halt_output(dev);
362 adev->dmap_out->flags &= ~DMA_STARTED;
363
364 f=claim_dma_lock();
365 clear_dma_ff(dmap->dma);
366 disable_dma(dmap->dma);
367 release_dma_lock(f);
368
369 restore_flags(flags);
370 dmap->byte_counter = 0;
371 reorganize_buffers(dev, adev->dmap_out, 0);
372 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
373 }
374
375 static void dma_reset_input(int dev)
376 {
377 struct audio_operations *adev = audio_devs[dev];
378 unsigned long flags;
379 struct dma_buffparms *dmap = adev->dmap_in;
380
381 save_flags(flags);
382 cli();
383 if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
384 adev->d->halt_io(dev);
385 else
386 adev->d->halt_input(dev);
387 adev->dmap_in->flags &= ~DMA_STARTED;
388 restore_flags(flags);
389
390 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
391 dmap->byte_counter = 0;
392 reorganize_buffers(dev, adev->dmap_in, 1);
393 }
394
395 void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
396 {
397 struct audio_operations *adev = audio_devs[dev];
398
399 if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
400 return; /* Don't start DMA yet */
401 dmap->dma_mode = DMODE_OUTPUT;
402
403 if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
404 if (!(dmap->flags & DMA_STARTED)) {
405 reorganize_buffers(dev, dmap, 0);
406 if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
407 return;
408 if (!(dmap->flags & DMA_NODMA))
409 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE);
410 dmap->flags |= DMA_STARTED;
411 }
412 if (dmap->counts[dmap->qhead] == 0)
413 dmap->counts[dmap->qhead] = dmap->fragment_size;
414 dmap->dma_mode = DMODE_OUTPUT;
415 adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
416 dmap->counts[dmap->qhead], 1);
417 if (adev->d->trigger)
418 adev->d->trigger(dev,adev->enable_bits * adev->go);
419 }
420 dmap->flags |= DMA_ACTIVE;
421 }
422
423 int DMAbuf_sync(int dev)
424 {
425 struct audio_operations *adev = audio_devs[dev];
426 unsigned long flags;
427 int n = 0;
428 struct dma_buffparms *dmap;
429
430 if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
431 return 0;
432
433 if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
434 dmap = adev->dmap_out;
435 save_flags(flags);
436 cli();
437 if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
438 DMAbuf_launch_output(dev, dmap);
439 adev->dmap_out->flags |= DMA_SYNCING;
440 adev->dmap_out->underrun_count = 0;
441 while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs &&
442 adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
443 long t = dmabuf_timeout(dmap);
444 t = interruptible_sleep_on_timeout(&adev->out_sleeper,
445 t);
446 if (!t) {
447 adev->dmap_out->flags &= ~DMA_SYNCING;
448 restore_flags(flags);
449 return adev->dmap_out->qlen;
450 }
451 }
452 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
453 restore_flags(flags);
454
455 /*
456 * Some devices such as GUS have huge amount of on board RAM for the
457 * audio data. We have to wait until the device has finished playing.
458 */
459
460 save_flags(flags);
461 cli();
462 if (adev->d->local_qlen) { /* Device has hidden buffers */
463 while (!signal_pending(current) &&
464 adev->d->local_qlen(dev))
465 interruptible_sleep_on_timeout(&adev->out_sleeper,
466 dmabuf_timeout(dmap));
467 }
468 restore_flags(flags);
469 }
470 adev->dmap_out->dma_mode = DMODE_NONE;
471 return adev->dmap_out->qlen;
472 }
473
474 int DMAbuf_release(int dev, int mode)
475 {
476 struct audio_operations *adev = audio_devs[dev];
477 unsigned long flags;
478
479 if (adev->open_mode & OPEN_WRITE)
480 adev->dmap_out->closing = 1;
481 if (adev->open_mode & OPEN_READ)
482 adev->dmap_in->closing = 1;
483
484 if (adev->open_mode & OPEN_WRITE)
485 if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED))
486 if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT))
487 DMAbuf_sync(dev);
488 if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
489 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use);
490 save_flags(flags);
491 cli();
492
493 DMAbuf_reset(dev);
494 adev->d->close(dev);
495
496 if (adev->open_mode & OPEN_WRITE)
497 close_dmap(adev, adev->dmap_out);
498
499 if (adev->open_mode == OPEN_READ ||
500 (adev->open_mode != OPEN_WRITE &&
501 (adev->flags & DMA_DUPLEX)))
502 close_dmap(adev, adev->dmap_in);
503 adev->open_mode = 0;
504 restore_flags(flags);
505 return 0;
506 }
507
508 int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap)
509 {
510 struct audio_operations *adev = audio_devs[dev];
511 int err;
512
513 if (!(adev->open_mode & OPEN_READ))
514 return 0;
515 if (!(adev->enable_bits & PCM_ENABLE_INPUT))
516 return 0;
517 if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */
518 DMAbuf_sync(dev);
519 DMAbuf_reset(dev);
520 dmap->dma_mode = DMODE_NONE;
521 }
522 if (!dmap->dma_mode) {
523 reorganize_buffers(dev, dmap, 1);
524 if ((err = adev->d->prepare_for_input(dev,
525 dmap->fragment_size, dmap->nbufs)) < 0)
526 return err;
527 dmap->dma_mode = DMODE_INPUT;
528 }
529 if (!(dmap->flags & DMA_ACTIVE)) {
530 if (dmap->needs_reorg)
531 reorganize_buffers(dev, dmap, 0);
532 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
533 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
534 dmap->fragment_size, 0);
535 dmap->flags |= DMA_ACTIVE;
536 if (adev->d->trigger)
537 adev->d->trigger(dev, adev->enable_bits * adev->go);
538 }
539 return 0;
540 }
541
542 int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
543 {
544 struct audio_operations *adev = audio_devs[dev];
545 unsigned long flags;
546 int err = 0, n = 0;
547 struct dma_buffparms *dmap = adev->dmap_in;
548 int go;
549
550 if (!(adev->open_mode & OPEN_READ))
551 return -EIO;
552 if (dmap->needs_reorg)
553 reorganize_buffers(dev, dmap, 0);
554 save_flags(flags);
555 cli();
556 if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
557 /* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/
558 restore_flags(flags);
559 return -EINVAL;
560 } else while (dmap->qlen <= 0 && n++ < 10) {
561 long timeout = MAX_SCHEDULE_TIMEOUT;
562 if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) {
563 restore_flags(flags);
564 return -EAGAIN;
565 }
566 if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) {
567 restore_flags(flags);
568 return err;
569 }
570 /* Wait for the next block */
571
572 if (dontblock) {
573 restore_flags(flags);
574 return -EAGAIN;
575 }
576 if ((go = adev->go))
577 timeout = dmabuf_timeout(dmap);
578 timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
579 timeout);
580 if (!timeout) {
581 /* FIXME: include device name */
582 err = -EIO;
583 printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
584 dma_reset_input(dev);
585 } else
586 err = -EINTR;
587 }
588 restore_flags(flags);
589
590 if (dmap->qlen <= 0)
591 return err ? err : -EINTR;
592 *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]];
593 *len = dmap->fragment_size - dmap->counts[dmap->qhead];
594
595 return dmap->qhead;
596 }
597
598 int DMAbuf_rmchars(int dev, int buff_no, int c)
599 {
600 struct audio_operations *adev = audio_devs[dev];
601 struct dma_buffparms *dmap = adev->dmap_in;
602 int p = dmap->counts[dmap->qhead] + c;
603
604 if (dmap->mapping_flags & DMA_MAP_MAPPED)
605 {
606 /* printk("Sound: Can't read from mmapped device (2)\n");*/
607 return -EINVAL;
608 }
609 else if (dmap->qlen <= 0)
610 return -EIO;
611 else if (p >= dmap->fragment_size) { /* This buffer is completely empty */
612 dmap->counts[dmap->qhead] = 0;
613 dmap->qlen--;
614 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
615 }
616 else dmap->counts[dmap->qhead] = p;
617
618 return 0;
619 }
620
621 int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction)
622 {
623 /*
624 * Try to approximate the active byte position of the DMA pointer within the
625 * buffer area as well as possible.
626 */
627
628 int pos;
629 unsigned long flags;
630 unsigned long f;
631
632 save_flags(flags);
633 cli();
634 if (!(dmap->flags & DMA_ACTIVE))
635 pos = 0;
636 else {
637 int chan = dmap->dma;
638
639 f=claim_dma_lock();
640 clear_dma_ff(chan);
641
642 if(!isa_dma_bridge_buggy)
643 disable_dma(dmap->dma);
644
645 pos = get_dma_residue(chan);
646
647 pos = dmap->bytes_in_use - pos;
648
649 if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) {
650 if (direction == DMODE_OUTPUT) {
651 if (dmap->qhead == 0)
652 if (pos > dmap->fragment_size)
653 pos = 0;
654 } else {
655 if (dmap->qtail == 0)
656 if (pos > dmap->fragment_size)
657 pos = 0;
658 }
659 }
660 if (pos < 0)
661 pos = 0;
662 if (pos >= dmap->bytes_in_use)
663 pos = 0;
664
665 if(!isa_dma_bridge_buggy)
666 enable_dma(dmap->dma);
667
668 release_dma_lock(f);
669 }
670 restore_flags(flags);
671 /* printk( "%04x ", pos); */
672
673 return pos;
674 }
675
676 /*
677 * DMAbuf_start_devices() is called by the /dev/music driver to start
678 * one or more audio devices at desired moment.
679 */
680
681 void DMAbuf_start_devices(unsigned int devmask)
682 {
683 struct audio_operations *adev;
684 int dev;
685
686 for (dev = 0; dev < num_audiodevs; dev++) {
687 if (!(devmask & (1 << dev)))
688 continue;
689 if (!(adev = audio_devs[dev]))
690 continue;
691 if (adev->open_mode == 0)
692 continue;
693 if (adev->go)
694 continue;
695 /* OK to start the device */
696 adev->go = 1;
697 if (adev->d->trigger)
698 adev->d->trigger(dev,adev->enable_bits * adev->go);
699 }
700 }
701
702 int DMAbuf_space_in_queue(int dev)
703 {
704 struct audio_operations *adev = audio_devs[dev];
705 int len, max, tmp;
706 struct dma_buffparms *dmap = adev->dmap_out;
707 int lim = dmap->nbufs;
708
709 if (lim < 2)
710 lim = 2;
711
712 if (dmap->qlen >= lim) /* No space at all */
713 return 0;
714
715 /*
716 * Verify that there are no more pending buffers than the limit
717 * defined by the process.
718 */
719
720 max = dmap->max_fragments;
721 if (max > lim)
722 max = lim;
723 len = dmap->qlen;
724
725 if (adev->d->local_qlen) {
726 tmp = adev->d->local_qlen(dev);
727 if (tmp && len)
728 tmp--; /* This buffer has been counted twice */
729 len += tmp;
730 }
731 if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */
732 len = len + 1;
733
734 if (len >= max)
735 return 0;
736 return max - len;
737 }
738
739 static int output_sleep(int dev, int dontblock)
740 {
741 struct audio_operations *adev = audio_devs[dev];
742 int err = 0;
743 struct dma_buffparms *dmap = adev->dmap_out;
744 long timeout;
745 long timeout_value;
746
747 if (dontblock)
748 return -EAGAIN;
749 if (!(adev->enable_bits & PCM_ENABLE_OUTPUT))
750 return -EAGAIN;
751
752 /*
753 * Wait for free space
754 */
755 if (signal_pending(current))
756 return -EINTR;
757 timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT));
758 if (timeout)
759 timeout_value = dmabuf_timeout(dmap);
760 else
761 timeout_value = MAX_SCHEDULE_TIMEOUT;
762 timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
763 timeout_value);
764 if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
765 printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
766 dma_reset_output(dev);
767 } else {
768 if (signal_pending(current))
769 err = -EINTR;
770 }
771 return err;
772 }
773
774 static int find_output_space(int dev, char **buf, int *size)
775 {
776 struct audio_operations *adev = audio_devs[dev];
777 struct dma_buffparms *dmap = adev->dmap_out;
778 unsigned long flags;
779 unsigned long active_offs;
780 long len, offs;
781 int maxfrags;
782 int occupied_bytes = (dmap->user_counter % dmap->fragment_size);
783
784 *buf = dmap->raw_buf;
785 if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes)
786 return 0;
787 save_flags(flags);
788 cli();
789
790 #ifdef BE_CONSERVATIVE
791 active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
792 #else
793 active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
794 /* Check for pointer wrapping situation */
795 if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
796 active_offs = 0;
797 active_offs += dmap->byte_counter;
798 #endif
799
800 offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP;
801 if (offs < 0 || offs >= dmap->bytes_in_use) {
802 restore_flags(flags);
803 printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs);
804 printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use);
805 return 0;
806 }
807 *buf = dmap->raw_buf + offs;
808
809 len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */
810
811 if ((offs + len) > dmap->bytes_in_use)
812 len = dmap->bytes_in_use - offs;
813 if (len < 0) {
814 restore_flags(flags);
815 return 0;
816 }
817 if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
818 len = (maxfrags * dmap->fragment_size) - occupied_bytes;
819 *size = len & ~SAMPLE_ROUNDUP;
820 restore_flags(flags);
821 return (*size > 0);
822 }
823
824 int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock)
825 {
826 struct audio_operations *adev = audio_devs[dev];
827 unsigned long flags;
828 int err = -EIO;
829 struct dma_buffparms *dmap = adev->dmap_out;
830
831 if (dmap->needs_reorg)
832 reorganize_buffers(dev, dmap, 0);
833
834 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
835 /* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/
836 return -EINVAL;
837 }
838 if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */
839 DMAbuf_reset(dev);
840 dmap->dma_mode = DMODE_NONE;
841 }
842 dmap->dma_mode = DMODE_OUTPUT;
843
844 save_flags(flags);
845 cli();
846 while (find_output_space(dev, buf, size) <= 0) {
847 if ((err = output_sleep(dev, dontblock)) < 0) {
848 restore_flags(flags);
849 return err;
850 }
851 }
852 restore_flags(flags);
853
854 return 0;
855 }
856
857 int DMAbuf_move_wrpointer(int dev, int l)
858 {
859 struct audio_operations *adev = audio_devs[dev];
860 struct dma_buffparms *dmap = adev->dmap_out;
861 unsigned long ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
862 unsigned long end_ptr, p;
863 int post = (dmap->flags & DMA_POST);
864
865 dmap->flags &= ~DMA_POST;
866 dmap->cfrag = -1;
867 dmap->user_counter += l;
868 dmap->flags |= DMA_DIRTY;
869
870 if (dmap->byte_counter >= dmap->max_byte_counter) {
871 /* Wrap the byte counters */
872 long decr = dmap->byte_counter;
873 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
874 decr -= dmap->byte_counter;
875 dmap->user_counter -= decr;
876 }
877 end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
878
879 p = (dmap->user_counter - 1) % dmap->bytes_in_use;
880 dmap->neutral_byte = dmap->raw_buf[p];
881
882 /* Update the fragment based bookkeeping too */
883 while (ptr < end_ptr) {
884 dmap->counts[dmap->qtail] = dmap->fragment_size;
885 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
886 dmap->qlen++;
887 ptr += dmap->fragment_size;
888 }
889
890 dmap->counts[dmap->qtail] = dmap->user_counter - ptr;
891
892 /*
893 * Let the low level driver to perform some postprocessing to
894 * the written data.
895 */
896 if (adev->d->postprocess_write)
897 adev->d->postprocess_write(dev);
898
899 if (!(dmap->flags & DMA_ACTIVE))
900 if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1)))
901 DMAbuf_launch_output(dev, dmap);
902 return 0;
903 }
904
905 int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode)
906 {
907 struct audio_operations *adev = audio_devs[dev];
908 struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
909
910 if (dmap->raw_buf == NULL) {
911 printk(KERN_ERR "sound: DMA buffer(1) == NULL\n");
912 printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in");
913 return 0;
914 }
915 if (dmap->dma < 0)
916 return 0;
917 sound_start_dma(dmap, physaddr, count, dma_mode);
918 return count;
919 }
920
921 static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode)
922 {
923 struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
924
925 if (dmap->raw_buf == NULL) {
926 printk(KERN_ERR "sound: DMA buffer(2) == NULL\n");
927 printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in");
928 return 0;
929 }
930 if (dmap->flags & DMA_NODMA)
931 return 1;
932 if (dmap->dma < 0)
933 return 0;
934 sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT);
935 dmap->flags |= DMA_STARTED;
936 return count;
937 }
938
939 static void finish_output_interrupt(int dev, struct dma_buffparms *dmap)
940 {
941 struct audio_operations *adev = audio_devs[dev];
942
943 if (dmap->audio_callback != NULL)
944 dmap->audio_callback(dev, dmap->callback_parm);
945 wake_up(&adev->out_sleeper);
946 wake_up(&adev->poll_sleeper);
947 }
948
949 static void do_outputintr(int dev, int dummy)
950 {
951 struct audio_operations *adev = audio_devs[dev];
952 unsigned long flags;
953 struct dma_buffparms *dmap = adev->dmap_out;
954 int this_fragment;
955
956 if (dmap->raw_buf == NULL) {
957 printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev);
958 return;
959 }
960 if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */
961 /* mmapped access */
962 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
963 if (dmap->qhead == 0) { /* Wrapped */
964 dmap->byte_counter += dmap->bytes_in_use;
965 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
966 long decr = dmap->byte_counter;
967 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
968 decr -= dmap->byte_counter;
969 dmap->user_counter -= decr;
970 }
971 }
972 dmap->qlen++; /* Yes increment it (don't decrement) */
973 if (!(adev->flags & DMA_AUTOMODE))
974 dmap->flags &= ~DMA_ACTIVE;
975 dmap->counts[dmap->qhead] = dmap->fragment_size;
976 DMAbuf_launch_output(dev, dmap);
977 finish_output_interrupt(dev, dmap);
978 return;
979 }
980 save_flags(flags);
981 cli();
982
983 dmap->qlen--;
984 this_fragment = dmap->qhead;
985 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
986
987 if (dmap->qhead == 0) { /* Wrapped */
988 dmap->byte_counter += dmap->bytes_in_use;
989 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
990 long decr = dmap->byte_counter;
991 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
992 decr -= dmap->byte_counter;
993 dmap->user_counter -= decr;
994 }
995 }
996 if (!(adev->flags & DMA_AUTOMODE))
997 dmap->flags &= ~DMA_ACTIVE;
998
999 /*
1000 * This is dmap->qlen <= 0 except when closing when
1001 * dmap->qlen < 0
1002 */
1003
1004 while (dmap->qlen <= -dmap->closing) {
1005 dmap->underrun_count++;
1006 dmap->qlen++;
1007 if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) {
1008 dmap->flags &= ~DMA_DIRTY;
1009 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
1010 adev->dmap_out->buffsize);
1011 }
1012 dmap->user_counter += dmap->fragment_size;
1013 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1014 }
1015 if (dmap->qlen > 0)
1016 DMAbuf_launch_output(dev, dmap);
1017 restore_flags(flags);
1018 finish_output_interrupt(dev, dmap);
1019 }
1020
1021 void DMAbuf_outputintr(int dev, int notify_only)
1022 {
1023 struct audio_operations *adev = audio_devs[dev];
1024 unsigned long flags;
1025 struct dma_buffparms *dmap = adev->dmap_out;
1026
1027 save_flags(flags);
1028 cli();
1029 if (!(dmap->flags & DMA_NODMA)) {
1030 int chan = dmap->dma, pos, n;
1031 unsigned long f;
1032
1033 f=claim_dma_lock();
1034
1035 if(!isa_dma_bridge_buggy)
1036 disable_dma(dmap->dma);
1037 clear_dma_ff(chan);
1038 pos = dmap->bytes_in_use - get_dma_residue(chan);
1039 if(!isa_dma_bridge_buggy)
1040 enable_dma(dmap->dma);
1041 release_dma_lock(f);
1042
1043 pos = pos / dmap->fragment_size; /* Actual qhead */
1044 if (pos < 0 || pos >= dmap->nbufs)
1045 pos = 0;
1046 n = 0;
1047 while (dmap->qhead != pos && n++ < dmap->nbufs)
1048 do_outputintr(dev, notify_only);
1049 }
1050 else
1051 do_outputintr(dev, notify_only);
1052 restore_flags(flags);
1053 }
1054
1055 static void do_inputintr(int dev)
1056 {
1057 struct audio_operations *adev = audio_devs[dev];
1058 struct dma_buffparms *dmap = adev->dmap_in;
1059
1060 if (dmap->raw_buf == NULL) {
1061 printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n");
1062 return;
1063 }
1064 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1065 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1066 if (dmap->qtail == 0) { /* Wrapped */
1067 dmap->byte_counter += dmap->bytes_in_use;
1068 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
1069 long decr = dmap->byte_counter;
1070 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
1071 decr -= dmap->byte_counter;
1072 dmap->user_counter -= decr;
1073 }
1074 }
1075 dmap->qlen++;
1076
1077 if (!(adev->flags & DMA_AUTOMODE)) {
1078 if (dmap->needs_reorg)
1079 reorganize_buffers(dev, dmap, 0);
1080 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ);
1081 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
1082 dmap->fragment_size, 1);
1083 if (adev->d->trigger)
1084 adev->d->trigger(dev, adev->enable_bits * adev->go);
1085 }
1086 dmap->flags |= DMA_ACTIVE;
1087 } else if (dmap->qlen >= (dmap->nbufs - 1)) {
1088 printk(KERN_WARNING "Sound: Recording overrun\n");
1089 dmap->underrun_count++;
1090
1091 /* Just throw away the oldest fragment but keep the engine running */
1092 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
1093 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1094 } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) {
1095 dmap->qlen++;
1096 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1097 if (dmap->qtail == 0) { /* Wrapped */
1098 dmap->byte_counter += dmap->bytes_in_use;
1099 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
1100 long decr = dmap->byte_counter;
1101 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
1102 decr -= dmap->byte_counter;
1103 dmap->user_counter -= decr;
1104 }
1105 }
1106 }
1107 if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
1108 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
1109 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1);
1110 if (adev->d->trigger)
1111 adev->d->trigger(dev,adev->enable_bits * adev->go);
1112 }
1113 dmap->flags |= DMA_ACTIVE;
1114 if (dmap->qlen > 0)
1115 {
1116 wake_up(&adev->in_sleeper);
1117 wake_up(&adev->poll_sleeper);
1118 }
1119 }
1120
1121 void DMAbuf_inputintr(int dev)
1122 {
1123 struct audio_operations *adev = audio_devs[dev];
1124 struct dma_buffparms *dmap = adev->dmap_in;
1125 unsigned long flags;
1126
1127 save_flags(flags);
1128 cli();
1129
1130 if (!(dmap->flags & DMA_NODMA)) {
1131 int chan = dmap->dma, pos, n;
1132 unsigned long f;
1133
1134 f=claim_dma_lock();
1135 if(!isa_dma_bridge_buggy)
1136 disable_dma(dmap->dma);
1137 clear_dma_ff(chan);
1138 pos = dmap->bytes_in_use - get_dma_residue(chan);
1139 if(!isa_dma_bridge_buggy)
1140 enable_dma(dmap->dma);
1141 release_dma_lock(f);
1142
1143 pos = pos / dmap->fragment_size; /* Actual qhead */
1144 if (pos < 0 || pos >= dmap->nbufs)
1145 pos = 0;
1146
1147 n = 0;
1148 while (dmap->qtail != pos && ++n < dmap->nbufs)
1149 do_inputintr(dev);
1150 } else
1151 do_inputintr(dev);
1152 restore_flags(flags);
1153 }
1154
1155 int DMAbuf_open_dma(int dev)
1156 {
1157 /*
1158 * NOTE! This routine opens only the primary DMA channel (output).
1159 */
1160 struct audio_operations *adev = audio_devs[dev];
1161 int err;
1162
1163 if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0)
1164 return -EBUSY;
1165 dma_init_buffers(adev->dmap_out);
1166 adev->dmap_out->flags |= DMA_ALLOC_DONE;
1167 adev->dmap_out->fragment_size = adev->dmap_out->buffsize;
1168
1169 if (adev->dmap_out->dma >= 0) {
1170 unsigned long flags;
1171
1172 flags=claim_dma_lock();
1173 clear_dma_ff(adev->dmap_out->dma);
1174 disable_dma(adev->dmap_out->dma);
1175 release_dma_lock(flags);
1176 }
1177 return 0;
1178 }
1179
1180 void DMAbuf_close_dma(int dev)
1181 {
1182 close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out);
1183 }
1184
1185 void DMAbuf_init(int dev, int dma1, int dma2)
1186 {
1187 struct audio_operations *adev = audio_devs[dev];
1188 /*
1189 * NOTE! This routine could be called several times.
1190 */
1191
1192 /* drag in audio_syms.o */
1193 {
1194 extern char audio_syms_symbol;
1195 audio_syms_symbol = 0;
1196 }
1197
1198 if (adev && adev->dmap_out == NULL) {
1199 if (adev->d == NULL)
1200 panic("OSS: audio_devs[%d]->d == NULL\n", dev);
1201
1202 if (adev->parent_dev) { /* Use DMA map of the parent dev */
1203 int parent = adev->parent_dev - 1;
1204 adev->dmap_out = audio_devs[parent]->dmap_out;
1205 adev->dmap_in = audio_devs[parent]->dmap_in;
1206 } else {
1207 adev->dmap_out = adev->dmap_in = &adev->dmaps[0];
1208 adev->dmap_out->dma = dma1;
1209 if (adev->flags & DMA_DUPLEX) {
1210 adev->dmap_in = &adev->dmaps[1];
1211 adev->dmap_in->dma = dma2;
1212 }
1213 }
1214 /* Persistent DMA buffers allocated here */
1215 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
1216 if (adev->dmap_in->raw_buf == NULL)
1217 sound_alloc_dmap(adev->dmap_in);
1218 if (adev->dmap_out->raw_buf == NULL)
1219 sound_alloc_dmap(adev->dmap_out);
1220 }
1221 }
1222 }
1223
1224 /* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */
1225 static unsigned int poll_input(struct file * file, int dev, poll_table *wait)
1226 {
1227 struct audio_operations *adev = audio_devs[dev];
1228 struct dma_buffparms *dmap = adev->dmap_in;
1229
1230 if (!(adev->open_mode & OPEN_READ))
1231 return 0;
1232 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1233 if (dmap->qlen)
1234 return POLLIN | POLLRDNORM;
1235 return 0;
1236 }
1237 if (dmap->dma_mode != DMODE_INPUT) {
1238 if (dmap->dma_mode == DMODE_NONE &&
1239 adev->enable_bits & PCM_ENABLE_INPUT &&
1240 !dmap->qlen && adev->go) {
1241 unsigned long flags;
1242
1243 save_flags(flags);
1244 cli();
1245 DMAbuf_activate_recording(dev, dmap);
1246 restore_flags(flags);
1247 }
1248 return 0;
1249 }
1250 if (!dmap->qlen)
1251 return 0;
1252 return POLLIN | POLLRDNORM;
1253 }
1254
1255 static unsigned int poll_output(struct file * file, int dev, poll_table *wait)
1256 {
1257 struct audio_operations *adev = audio_devs[dev];
1258 struct dma_buffparms *dmap = adev->dmap_out;
1259
1260 if (!(adev->open_mode & OPEN_WRITE))
1261 return 0;
1262 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1263 if (dmap->qlen)
1264 return POLLOUT | POLLWRNORM;
1265 return 0;
1266 }
1267 if (dmap->dma_mode == DMODE_INPUT)
1268 return 0;
1269 if (dmap->dma_mode == DMODE_NONE)
1270 return POLLOUT | POLLWRNORM;
1271 if (!DMAbuf_space_in_queue(dev))
1272 return 0;
1273 return POLLOUT | POLLWRNORM;
1274 }
1275
1276 unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait)
1277 {
1278 struct audio_operations *adev = audio_devs[dev];
1279 poll_wait(file, &adev->poll_sleeper, wait);
1280 return poll_input(file, dev, wait) | poll_output(file, dev, wait);
1281 }
1282
1283 void DMAbuf_deinit(int dev)
1284 {
1285 struct audio_operations *adev = audio_devs[dev];
1286 /* This routine is called when driver is being unloaded */
1287 if (!adev)
1288 return;
1289
1290 /* Persistent DMA buffers deallocated here */
1291 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
1292 sound_free_dmap(adev->dmap_out);
1293 if (adev->flags & DMA_DUPLEX)
1294 sound_free_dmap(adev->dmap_in);
1295 }
1296 }
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