?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / sound / oss / dmabuf.c
blob014f2e6720ca32550a5fedb82e1455e262b683d2
1 /*
2 * sound/oss/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 <linux/mm.h>
29 #include <linux/gfp.h>
30 #include "sound_config.h"
31
32 #define DMAP_FREE_ON_CLOSE 0
33 #define DMAP_KEEP_ON_CLOSE 1
34 extern int sound_dmap_flag;
35
36 static void dma_reset_output(int dev);
37 static void dma_reset_input(int dev);
38 static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);
39
40
41
42 static int debugmem; /* switched off by default */
43 static int dma_buffsize = DSP_BUFFSIZE;
44
45 static long dmabuf_timeout(struct dma_buffparms *dmap)
46 {
47 long tmout;
48
49 tmout = (dmap->fragment_size * HZ) / dmap->data_rate;
50 tmout += HZ / 5; /* Some safety distance */
51 if (tmout < (HZ / 2))
52 tmout = HZ / 2;
53 if (tmout > 20 * HZ)
54 tmout = 20 * HZ;
55 return tmout;
56 }
57
58 static int sound_alloc_dmap(struct dma_buffparms *dmap)
59 {
60 char *start_addr, *end_addr;
61 int dma_pagesize;
62 int sz, size;
63 struct page *page;
64
65 dmap->mapping_flags &= ~DMA_MAP_MAPPED;
66
67 if (dmap->raw_buf != NULL)
68 return 0; /* Already done */
69 if (dma_buffsize < 4096)
70 dma_buffsize = 4096;
71 dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
72
73 /*
74 * Now check for the Cyrix problem.
75 */
76
77 if(isa_dma_bridge_buggy==2)
78 dma_pagesize=32768;
79
80 dmap->raw_buf = NULL;
81 dmap->buffsize = dma_buffsize;
82 if (dmap->buffsize > dma_pagesize)
83 dmap->buffsize = dma_pagesize;
84 start_addr = NULL;
85 /*
86 * Now loop until we get a free buffer. Try to get smaller buffer if
87 * it fails. Don't accept smaller than 8k buffer for performance
88 * reasons.
89 */
90 while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
91 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
92 dmap->buffsize = PAGE_SIZE * (1 << sz);
93 start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz);
94 if (start_addr == NULL)
95 dmap->buffsize /= 2;
96 }
97
98 if (start_addr == NULL) {
99 printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n");
100 return -ENOMEM;
101 } else {
102 /* make some checks */
103 end_addr = start_addr + dmap->buffsize - 1;
104
105 if (debugmem)
106 printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr);
107
108 /* now check if it fits into the same dma-pagesize */
109
110 if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
111 || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
112 printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize);
113 return -EFAULT;
114 }
115 }
116 dmap->raw_buf = start_addr;
117 dmap->raw_buf_phys = virt_to_bus(start_addr);
118
119 for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
120 SetPageReserved(page);
121 return 0;
122 }
123
124 static void sound_free_dmap(struct dma_buffparms *dmap)
125 {
126 int sz, size;
127 struct page *page;
128 unsigned long start_addr, end_addr;
129
130 if (dmap->raw_buf == NULL)
131 return;
132 if (dmap->mapping_flags & DMA_MAP_MAPPED)
133 return; /* Don't free mmapped buffer. Will use it next time */
134 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
135
136 start_addr = (unsigned long) dmap->raw_buf;
137 end_addr = start_addr + dmap->buffsize;
138
139 for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
140 ClearPageReserved(page);
141
142 free_pages((unsigned long) dmap->raw_buf, sz);
143 dmap->raw_buf = NULL;
144 }
145
146
147 /* Intel version !!!!!!!!! */
148
149 static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
150 {
151 unsigned long flags;
152 int chan = dmap->dma;
153
154 /* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */
155
156 flags = claim_dma_lock();
157 disable_dma(chan);
158 clear_dma_ff(chan);
159 set_dma_mode(chan, dma_mode);
160 set_dma_addr(chan, physaddr);
161 set_dma_count(chan, count);
162 enable_dma(chan);
163 release_dma_lock(flags);
164
165 return 0;
166 }
167
168 static void dma_init_buffers(struct dma_buffparms *dmap)
169 {
170 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
171 dmap->byte_counter = 0;
172 dmap->max_byte_counter = 8000 * 60 * 60;
173 dmap->bytes_in_use = dmap->buffsize;
174
175 dmap->dma_mode = DMODE_NONE;
176 dmap->mapping_flags = 0;
177 dmap->neutral_byte = 0x80;
178 dmap->data_rate = 8000;
179 dmap->cfrag = -1;
180 dmap->closing = 0;
181 dmap->nbufs = 1;
182 dmap->flags = DMA_BUSY; /* Other flags off */
183 }
184
185 static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
186 {
187 int err;
188
189 if (dmap->flags & DMA_BUSY)
190 return -EBUSY;
191 if ((err = sound_alloc_dmap(dmap)) < 0)
192 return err;
193
194 if (dmap->raw_buf == NULL) {
195 printk(KERN_WARNING "Sound: DMA buffers not available\n");
196 return -ENOSPC; /* Memory allocation failed during boot */
197 }
198 if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
199 printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
200 return -EBUSY;
201 }
202 dma_init_buffers(dmap);
203 spin_lock_init(&dmap->lock);
204 dmap->open_mode = mode;
205 dmap->subdivision = dmap->underrun_count = 0;
206 dmap->fragment_size = 0;
207 dmap->max_fragments = 65536; /* Just a large value */
208 dmap->byte_counter = 0;
209 dmap->max_byte_counter = 8000 * 60 * 60;
210 dmap->applic_profile = APF_NORMAL;
211 dmap->needs_reorg = 1;
212 dmap->audio_callback = NULL;
213 dmap->callback_parm = 0;
214 return 0;
215 }
216
217 static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
218 {
219 unsigned long flags;
220
221 if (dmap->dma >= 0) {
222 sound_close_dma(dmap->dma);
223 flags=claim_dma_lock();
224 disable_dma(dmap->dma);
225 release_dma_lock(flags);
226 }
227 if (dmap->flags & DMA_BUSY)
228 dmap->dma_mode = DMODE_NONE;
229 dmap->flags &= ~DMA_BUSY;
230
231 if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
232 sound_free_dmap(dmap);
233 }
234
235
236 static unsigned int default_set_bits(int dev, unsigned int bits)
237 {
238 mm_segment_t fs = get_fs();
239
240 set_fs(get_ds());
241 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits);
242 set_fs(fs);
243 return bits;
244 }
245
246 static int default_set_speed(int dev, int speed)
247 {
248 mm_segment_t fs = get_fs();
249
250 set_fs(get_ds());
251 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed);
252 set_fs(fs);
253 return speed;
254 }
255
256 static short default_set_channels(int dev, short channels)
257 {
258 int c = channels;
259 mm_segment_t fs = get_fs();
260
261 set_fs(get_ds());
262 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c);
263 set_fs(fs);
264 return c;
265 }
266
267 static void check_driver(struct audio_driver *d)
268 {
269 if (d->set_speed == NULL)
270 d->set_speed = default_set_speed;
271 if (d->set_bits == NULL)
272 d->set_bits = default_set_bits;
273 if (d->set_channels == NULL)
274 d->set_channels = default_set_channels;
275 }
276
277 int DMAbuf_open(int dev, int mode)
278 {
279 struct audio_operations *adev = audio_devs[dev];
280 int retval;
281 struct dma_buffparms *dmap_in = NULL;
282 struct dma_buffparms *dmap_out = NULL;
283
284 if (!adev)
285 return -ENXIO;
286 if (!(adev->flags & DMA_DUPLEX))
287 adev->dmap_in = adev->dmap_out;
288 check_driver(adev->d);
289
290 if ((retval = adev->d->open(dev, mode)) < 0)
291 return retval;
292 dmap_out = adev->dmap_out;
293 dmap_in = adev->dmap_in;
294 if (dmap_in == dmap_out)
295 adev->flags &= ~DMA_DUPLEX;
296
297 if (mode & OPEN_WRITE) {
298 if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
299 adev->d->close(dev);
300 return retval;
301 }
302 }
303 adev->enable_bits = mode;
304
305 if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
306 if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
307 adev->d->close(dev);
308 if (mode & OPEN_WRITE)
309 close_dmap(adev, dmap_out);
310 return retval;
311 }
312 }
313 adev->open_mode = mode;
314 adev->go = 1;
315
316 adev->d->set_bits(dev, 8);
317 adev->d->set_channels(dev, 1);
318 adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
319 if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
320 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
321 adev->dmap_out->bytes_in_use);
322 return 0;
323 }
324 /* MUST not hold the spinlock */
325 void DMAbuf_reset(int dev)
326 {
327 if (audio_devs[dev]->open_mode & OPEN_WRITE)
328 dma_reset_output(dev);
329
330 if (audio_devs[dev]->open_mode & OPEN_READ)
331 dma_reset_input(dev);
332 }
333
334 static void dma_reset_output(int dev)
335 {
336 struct audio_operations *adev = audio_devs[dev];
337 unsigned long flags,f ;
338 struct dma_buffparms *dmap = adev->dmap_out;
339
340 if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */
341 return;
342
343 /*
344 * First wait until the current fragment has been played completely
345 */
346 spin_lock_irqsave(&dmap->lock,flags);
347 adev->dmap_out->flags |= DMA_SYNCING;
348
349 adev->dmap_out->underrun_count = 0;
350 if (!signal_pending(current) && adev->dmap_out->qlen &&
351 adev->dmap_out->underrun_count == 0){
352 spin_unlock_irqrestore(&dmap->lock,flags);
353 interruptible_sleep_on_timeout(&adev->out_sleeper,
354 dmabuf_timeout(dmap));
355 spin_lock_irqsave(&dmap->lock,flags);
356 }
357 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
358
359 /*
360 * Finally shut the device off
361 */
362 if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
363 adev->d->halt_io(dev);
364 else
365 adev->d->halt_output(dev);
366 adev->dmap_out->flags &= ~DMA_STARTED;
367
368 f=claim_dma_lock();
369 clear_dma_ff(dmap->dma);
370 disable_dma(dmap->dma);
371 release_dma_lock(f);
372
373 dmap->byte_counter = 0;
374 reorganize_buffers(dev, adev->dmap_out, 0);
375 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
376 spin_unlock_irqrestore(&dmap->lock,flags);
377 }
378
379 static void dma_reset_input(int dev)
380 {
381 struct audio_operations *adev = audio_devs[dev];
382 unsigned long flags;
383 struct dma_buffparms *dmap = adev->dmap_in;
384
385 spin_lock_irqsave(&dmap->lock,flags);
386 if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
387 adev->d->halt_io(dev);
388 else
389 adev->d->halt_input(dev);
390 adev->dmap_in->flags &= ~DMA_STARTED;
391
392 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
393 dmap->byte_counter = 0;
394 reorganize_buffers(dev, adev->dmap_in, 1);
395 spin_unlock_irqrestore(&dmap->lock,flags);
396 }
397 /* MUST be called with holding the dmap->lock */
398 void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
399 {
400 struct audio_operations *adev = audio_devs[dev];
401
402 if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
403 return; /* Don't start DMA yet */
404 dmap->dma_mode = DMODE_OUTPUT;
405
406 if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
407 if (!(dmap->flags & DMA_STARTED)) {
408 reorganize_buffers(dev, dmap, 0);
409 if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
410 return;
411 if (!(dmap->flags & DMA_NODMA))
412 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE);
413 dmap->flags |= DMA_STARTED;
414 }
415 if (dmap->counts[dmap->qhead] == 0)
416 dmap->counts[dmap->qhead] = dmap->fragment_size;
417 dmap->dma_mode = DMODE_OUTPUT;
418 adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
419 dmap->counts[dmap->qhead], 1);
420 if (adev->d->trigger)
421 adev->d->trigger(dev,adev->enable_bits * adev->go);
422 }
423 dmap->flags |= DMA_ACTIVE;
424 }
425
426 int DMAbuf_sync(int dev)
427 {
428 struct audio_operations *adev = audio_devs[dev];
429 unsigned long flags;
430 int n = 0;
431 struct dma_buffparms *dmap;
432
433 if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
434 return 0;
435
436 if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
437 dmap = adev->dmap_out;
438 spin_lock_irqsave(&dmap->lock,flags);
439 if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
440 DMAbuf_launch_output(dev, dmap);
441 adev->dmap_out->flags |= DMA_SYNCING;
442 adev->dmap_out->underrun_count = 0;
443 while (!signal_pending(current) && n++ < adev->dmap_out->nbufs &&
444 adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
445 long t = dmabuf_timeout(dmap);
446 spin_unlock_irqrestore(&dmap->lock,flags);
447 t = interruptible_sleep_on_timeout(&adev->out_sleeper, t);
448 spin_lock_irqsave(&dmap->lock,flags);
449 if (!t) {
450 adev->dmap_out->flags &= ~DMA_SYNCING;
451 spin_unlock_irqrestore(&dmap->lock,flags);
452 return adev->dmap_out->qlen;
453 }
454 }
455 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
456
457 /*
458 * Some devices such as GUS have huge amount of on board RAM for the
459 * audio data. We have to wait until the device has finished playing.
460 */
461
462 /* still holding the lock */
463 if (adev->d->local_qlen) { /* Device has hidden buffers */
464 while (!signal_pending(current) &&
465 adev->d->local_qlen(dev)){
466 spin_unlock_irqrestore(&dmap->lock,flags);
467 interruptible_sleep_on_timeout(&adev->out_sleeper,
468 dmabuf_timeout(dmap));
469 spin_lock_irqsave(&dmap->lock,flags);
470 }
471 }
472 spin_unlock_irqrestore(&dmap->lock,flags);
473 }
474 adev->dmap_out->dma_mode = DMODE_NONE;
475 return adev->dmap_out->qlen;
476 }
477
478 int DMAbuf_release(int dev, int mode)
479 {
480 struct audio_operations *adev = audio_devs[dev];
481 struct dma_buffparms *dmap;
482 unsigned long flags;
483
484 dmap = adev->dmap_out;
485 if (adev->open_mode & OPEN_WRITE)
486 adev->dmap_out->closing = 1;
487
488 if (adev->open_mode & OPEN_READ){
489 adev->dmap_in->closing = 1;
490 dmap = adev->dmap_in;
491 }
492 if (adev->open_mode & OPEN_WRITE)
493 if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED))
494 if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT))
495 DMAbuf_sync(dev);
496 if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
497 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use);
498
499 DMAbuf_reset(dev);
500 spin_lock_irqsave(&dmap->lock,flags);
501 adev->d->close(dev);
502
503 if (adev->open_mode & OPEN_WRITE)
504 close_dmap(adev, adev->dmap_out);
505
506 if (adev->open_mode == OPEN_READ ||
507 (adev->open_mode != OPEN_WRITE &&
508 (adev->flags & DMA_DUPLEX)))
509 close_dmap(adev, adev->dmap_in);
510 adev->open_mode = 0;
511 spin_unlock_irqrestore(&dmap->lock,flags);
512 return 0;
513 }
514 /* called with dmap->lock dold */
515 int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap)
516 {
517 struct audio_operations *adev = audio_devs[dev];
518 int err;
519
520 if (!(adev->open_mode & OPEN_READ))
521 return 0;
522 if (!(adev->enable_bits & PCM_ENABLE_INPUT))
523 return 0;
524 if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */
525 /* release lock - it's not recursive */
526 spin_unlock_irq(&dmap->lock);
527 DMAbuf_sync(dev);
528 DMAbuf_reset(dev);
529 spin_lock_irq(&dmap->lock);
530 dmap->dma_mode = DMODE_NONE;
531 }
532 if (!dmap->dma_mode) {
533 reorganize_buffers(dev, dmap, 1);
534 if ((err = adev->d->prepare_for_input(dev,
535 dmap->fragment_size, dmap->nbufs)) < 0)
536 return err;
537 dmap->dma_mode = DMODE_INPUT;
538 }
539 if (!(dmap->flags & DMA_ACTIVE)) {
540 if (dmap->needs_reorg)
541 reorganize_buffers(dev, dmap, 0);
542 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
543 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
544 dmap->fragment_size, 0);
545 dmap->flags |= DMA_ACTIVE;
546 if (adev->d->trigger)
547 adev->d->trigger(dev, adev->enable_bits * adev->go);
548 }
549 return 0;
550 }
551 /* acquires lock */
552 int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
553 {
554 struct audio_operations *adev = audio_devs[dev];
555 unsigned long flags;
556 int err = 0, n = 0;
557 struct dma_buffparms *dmap = adev->dmap_in;
558 int go;
559
560 if (!(adev->open_mode & OPEN_READ))
561 return -EIO;
562 spin_lock_irqsave(&dmap->lock,flags);
563 if (dmap->needs_reorg)
564 reorganize_buffers(dev, dmap, 0);
565 if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
566 /* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/
567 spin_unlock_irqrestore(&dmap->lock,flags);
568 return -EINVAL;
569 } else while (dmap->qlen <= 0 && n++ < 10) {
570 long timeout = MAX_SCHEDULE_TIMEOUT;
571 if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) {
572 spin_unlock_irqrestore(&dmap->lock,flags);
573 return -EAGAIN;
574 }
575 if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) {
576 spin_unlock_irqrestore(&dmap->lock,flags);
577 return err;
578 }
579 /* Wait for the next block */
580
581 if (dontblock) {
582 spin_unlock_irqrestore(&dmap->lock,flags);
583 return -EAGAIN;
584 }
585 if ((go = adev->go))
586 timeout = dmabuf_timeout(dmap);
587
588 spin_unlock_irqrestore(&dmap->lock,flags);
589 timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
590 timeout);
591 if (!timeout) {
592 err = -EIO;
593 printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
594 dma_reset_input(dev);
595 } else
596 err = -EINTR;
597 spin_lock_irqsave(&dmap->lock,flags);
598 }
599 spin_unlock_irqrestore(&dmap->lock,flags);
600
601 if (dmap->qlen <= 0)
602 return err ? err : -EINTR;
603 *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]];
604 *len = dmap->fragment_size - dmap->counts[dmap->qhead];
605
606 return dmap->qhead;
607 }
608
609 int DMAbuf_rmchars(int dev, int buff_no, int c)
610 {
611 struct audio_operations *adev = audio_devs[dev];
612 struct dma_buffparms *dmap = adev->dmap_in;
613 int p = dmap->counts[dmap->qhead] + c;
614
615 if (dmap->mapping_flags & DMA_MAP_MAPPED)
616 {
617 /* printk("Sound: Can't read from mmapped device (2)\n");*/
618 return -EINVAL;
619 }
620 else if (dmap->qlen <= 0)
621 return -EIO;
622 else if (p >= dmap->fragment_size) { /* This buffer is completely empty */
623 dmap->counts[dmap->qhead] = 0;
624 dmap->qlen--;
625 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
626 }
627 else dmap->counts[dmap->qhead] = p;
628
629 return 0;
630 }
631 /* MUST be called with dmap->lock hold */
632 int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction)
633 {
634 /*
635 * Try to approximate the active byte position of the DMA pointer within the
636 * buffer area as well as possible.
637 */
638
639 int pos;
640 unsigned long f;
641
642 if (!(dmap->flags & DMA_ACTIVE))
643 pos = 0;
644 else {
645 int chan = dmap->dma;
646
647 f=claim_dma_lock();
648 clear_dma_ff(chan);
649
650 if(!isa_dma_bridge_buggy)
651 disable_dma(dmap->dma);
652
653 pos = get_dma_residue(chan);
654
655 pos = dmap->bytes_in_use - pos;
656
657 if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) {
658 if (direction == DMODE_OUTPUT) {
659 if (dmap->qhead == 0)
660 if (pos > dmap->fragment_size)
661 pos = 0;
662 } else {
663 if (dmap->qtail == 0)
664 if (pos > dmap->fragment_size)
665 pos = 0;
666 }
667 }
668 if (pos < 0)
669 pos = 0;
670 if (pos >= dmap->bytes_in_use)
671 pos = 0;
672
673 if(!isa_dma_bridge_buggy)
674 enable_dma(dmap->dma);
675
676 release_dma_lock(f);
677 }
678 /* printk( "%04x ", pos); */
679
680 return pos;
681 }
682
683 /*
684 * DMAbuf_start_devices() is called by the /dev/music driver to start
685 * one or more audio devices at desired moment.
686 */
687
688 void DMAbuf_start_devices(unsigned int devmask)
689 {
690 struct audio_operations *adev;
691 int dev;
692
693 for (dev = 0; dev < num_audiodevs; dev++) {
694 if (!(devmask & (1 << dev)))
695 continue;
696 if (!(adev = audio_devs[dev]))
697 continue;
698 if (adev->open_mode == 0)
699 continue;
700 if (adev->go)
701 continue;
702 /* OK to start the device */
703 adev->go = 1;
704 if (adev->d->trigger)
705 adev->d->trigger(dev,adev->enable_bits * adev->go);
706 }
707 }
708 /* via poll called without a lock ?*/
709 int DMAbuf_space_in_queue(int dev)
710 {
711 struct audio_operations *adev = audio_devs[dev];
712 int len, max, tmp;
713 struct dma_buffparms *dmap = adev->dmap_out;
714 int lim = dmap->nbufs;
715
716 if (lim < 2)
717 lim = 2;
718
719 if (dmap->qlen >= lim) /* No space at all */
720 return 0;
721
722 /*
723 * Verify that there are no more pending buffers than the limit
724 * defined by the process.
725 */
726
727 max = dmap->max_fragments;
728 if (max > lim)
729 max = lim;
730 len = dmap->qlen;
731
732 if (adev->d->local_qlen) {
733 tmp = adev->d->local_qlen(dev);
734 if (tmp && len)
735 tmp--; /* This buffer has been counted twice */
736 len += tmp;
737 }
738 if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */
739 len = len + 1;
740
741 if (len >= max)
742 return 0;
743 return max - len;
744 }
745 /* MUST not hold the spinlock - this function may sleep */
746 static int output_sleep(int dev, int dontblock)
747 {
748 struct audio_operations *adev = audio_devs[dev];
749 int err = 0;
750 struct dma_buffparms *dmap = adev->dmap_out;
751 long timeout;
752 long timeout_value;
753
754 if (dontblock)
755 return -EAGAIN;
756 if (!(adev->enable_bits & PCM_ENABLE_OUTPUT))
757 return -EAGAIN;
758
759 /*
760 * Wait for free space
761 */
762 if (signal_pending(current))
763 return -EINTR;
764 timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT));
765 if (timeout)
766 timeout_value = dmabuf_timeout(dmap);
767 else
768 timeout_value = MAX_SCHEDULE_TIMEOUT;
769 timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
770 timeout_value);
771 if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
772 printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
773 dma_reset_output(dev);
774 } else {
775 if (signal_pending(current))
776 err = -EINTR;
777 }
778 return err;
779 }
780 /* called with the lock held */
781 static int find_output_space(int dev, char **buf, int *size)
782 {
783 struct audio_operations *adev = audio_devs[dev];
784 struct dma_buffparms *dmap = adev->dmap_out;
785 unsigned long active_offs;
786 long len, offs;
787 int maxfrags;
788 int occupied_bytes = (dmap->user_counter % dmap->fragment_size);
789
790 *buf = dmap->raw_buf;
791 if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes)
792 return 0;
793
794 #ifdef BE_CONSERVATIVE
795 active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
796 #else
797 active_offs = max(DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT), 0);
798 /* Check for pointer wrapping situation */
799 if (active_offs >= dmap->bytes_in_use)
800 active_offs = 0;
801 active_offs += dmap->byte_counter;
802 #endif
803
804 offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP;
805 if (offs < 0 || offs >= dmap->bytes_in_use) {
806 printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs);
807 printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use);
808 return 0;
809 }
810 *buf = dmap->raw_buf + offs;
811
812 len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */
813
814 if ((offs + len) > dmap->bytes_in_use)
815 len = dmap->bytes_in_use - offs;
816 if (len < 0) {
817 return 0;
818 }
819 if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
820 len = (maxfrags * dmap->fragment_size) - occupied_bytes;
821 *size = len & ~SAMPLE_ROUNDUP;
822 return (*size > 0);
823 }
824 /* acquires lock */
825 int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock)
826 {
827 struct audio_operations *adev = audio_devs[dev];
828 unsigned long flags;
829 int err = -EIO;
830 struct dma_buffparms *dmap = adev->dmap_out;
831
832 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
833 /* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/
834 return -EINVAL;
835 }
836 spin_lock_irqsave(&dmap->lock,flags);
837 if (dmap->needs_reorg)
838 reorganize_buffers(dev, dmap, 0);
839
840 if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */
841 spin_unlock_irqrestore(&dmap->lock,flags);
842 DMAbuf_reset(dev);
843 spin_lock_irqsave(&dmap->lock,flags);
844 }
845 dmap->dma_mode = DMODE_OUTPUT;
846
847 while (find_output_space(dev, buf, size) <= 0) {
848 spin_unlock_irqrestore(&dmap->lock,flags);
849 if ((err = output_sleep(dev, dontblock)) < 0) {
850 return err;
851 }
852 spin_lock_irqsave(&dmap->lock,flags);
853 }
854
855 spin_unlock_irqrestore(&dmap->lock,flags);
856 return 0;
857 }
858 /* has to acquire dmap->lock */
859 int DMAbuf_move_wrpointer(int dev, int l)
860 {
861 struct audio_operations *adev = audio_devs[dev];
862 struct dma_buffparms *dmap = adev->dmap_out;
863 unsigned long ptr;
864 unsigned long end_ptr, p;
865 int post;
866 unsigned long flags;
867
868 spin_lock_irqsave(&dmap->lock,flags);
869 post= (dmap->flags & DMA_POST);
870 ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
871
872 dmap->flags &= ~DMA_POST;
873 dmap->cfrag = -1;
874 dmap->user_counter += l;
875 dmap->flags |= DMA_DIRTY;
876
877 if (dmap->byte_counter >= dmap->max_byte_counter) {
878 /* Wrap the byte counters */
879 long decr = dmap->byte_counter;
880 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
881 decr -= dmap->byte_counter;
882 dmap->user_counter -= decr;
883 }
884 end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
885
886 p = (dmap->user_counter - 1) % dmap->bytes_in_use;
887 dmap->neutral_byte = dmap->raw_buf[p];
888
889 /* Update the fragment based bookkeeping too */
890 while (ptr < end_ptr) {
891 dmap->counts[dmap->qtail] = dmap->fragment_size;
892 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
893 dmap->qlen++;
894 ptr += dmap->fragment_size;
895 }
896
897 dmap->counts[dmap->qtail] = dmap->user_counter - ptr;
898
899 /*
900 * Let the low level driver perform some postprocessing to
901 * the written data.
902 */
903 if (adev->d->postprocess_write)
904 adev->d->postprocess_write(dev);
905
906 if (!(dmap->flags & DMA_ACTIVE))
907 if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1)))
908 DMAbuf_launch_output(dev, dmap);
909
910 spin_unlock_irqrestore(&dmap->lock,flags);
911 return 0;
912 }
913
914 int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode)
915 {
916 struct audio_operations *adev = audio_devs[dev];
917 struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
918
919 if (dmap->raw_buf == NULL) {
920 printk(KERN_ERR "sound: DMA buffer(1) == NULL\n");
921 printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in");
922 return 0;
923 }
924 if (dmap->dma < 0)
925 return 0;
926 sound_start_dma(dmap, physaddr, count, dma_mode);
927 return count;
928 }
929 EXPORT_SYMBOL(DMAbuf_start_dma);
930
931 static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode)
932 {
933 struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
934
935 if (dmap->raw_buf == NULL) {
936 printk(KERN_ERR "sound: DMA buffer(2) == NULL\n");
937 printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in");
938 return 0;
939 }
940 if (dmap->flags & DMA_NODMA)
941 return 1;
942 if (dmap->dma < 0)
943 return 0;
944 sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT);
945 dmap->flags |= DMA_STARTED;
946 return count;
947 }
948
949 static void finish_output_interrupt(int dev, struct dma_buffparms *dmap)
950 {
951 struct audio_operations *adev = audio_devs[dev];
952
953 if (dmap->audio_callback != NULL)
954 dmap->audio_callback(dev, dmap->callback_parm);
955 wake_up(&adev->out_sleeper);
956 wake_up(&adev->poll_sleeper);
957 }
958 /* called with dmap->lock held in irq context*/
959 static void do_outputintr(int dev, int dummy)
960 {
961 struct audio_operations *adev = audio_devs[dev];
962 struct dma_buffparms *dmap = adev->dmap_out;
963 int this_fragment;
964
965 if (dmap->raw_buf == NULL) {
966 printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev);
967 return;
968 }
969 if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */
970 /* mmapped access */
971 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
972 if (dmap->qhead == 0) { /* Wrapped */
973 dmap->byte_counter += dmap->bytes_in_use;
974 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
975 long decr = dmap->byte_counter;
976 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
977 decr -= dmap->byte_counter;
978 dmap->user_counter -= decr;
979 }
980 }
981 dmap->qlen++; /* Yes increment it (don't decrement) */
982 if (!(adev->flags & DMA_AUTOMODE))
983 dmap->flags &= ~DMA_ACTIVE;
984 dmap->counts[dmap->qhead] = dmap->fragment_size;
985 DMAbuf_launch_output(dev, dmap);
986 finish_output_interrupt(dev, dmap);
987 return;
988 }
989
990 dmap->qlen--;
991 this_fragment = dmap->qhead;
992 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
993
994 if (dmap->qhead == 0) { /* Wrapped */
995 dmap->byte_counter += dmap->bytes_in_use;
996 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
997 long decr = dmap->byte_counter;
998 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
999 decr -= dmap->byte_counter;
1000 dmap->user_counter -= decr;
1001 }
1002 }
1003 if (!(adev->flags & DMA_AUTOMODE))
1004 dmap->flags &= ~DMA_ACTIVE;
1005
1006 /*
1007 * This is dmap->qlen <= 0 except when closing when
1008 * dmap->qlen < 0
1009 */
1010
1011 while (dmap->qlen <= -dmap->closing) {
1012 dmap->underrun_count++;
1013 dmap->qlen++;
1014 if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) {
1015 dmap->flags &= ~DMA_DIRTY;
1016 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
1017 adev->dmap_out->buffsize);
1018 }
1019 dmap->user_counter += dmap->fragment_size;
1020 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1021 }
1022 if (dmap->qlen > 0)
1023 DMAbuf_launch_output(dev, dmap);
1024 finish_output_interrupt(dev, dmap);
1025 }
1026 /* called in irq context */
1027 void DMAbuf_outputintr(int dev, int notify_only)
1028 {
1029 struct audio_operations *adev = audio_devs[dev];
1030 unsigned long flags;
1031 struct dma_buffparms *dmap = adev->dmap_out;
1032
1033 spin_lock_irqsave(&dmap->lock,flags);
1034 if (!(dmap->flags & DMA_NODMA)) {
1035 int chan = dmap->dma, pos, n;
1036 unsigned long f;
1037
1038 f=claim_dma_lock();
1039
1040 if(!isa_dma_bridge_buggy)
1041 disable_dma(dmap->dma);
1042 clear_dma_ff(chan);
1043 pos = dmap->bytes_in_use - get_dma_residue(chan);
1044 if(!isa_dma_bridge_buggy)
1045 enable_dma(dmap->dma);
1046 release_dma_lock(f);
1047
1048 pos = pos / dmap->fragment_size; /* Actual qhead */
1049 if (pos < 0 || pos >= dmap->nbufs)
1050 pos = 0;
1051 n = 0;
1052 while (dmap->qhead != pos && n++ < dmap->nbufs)
1053 do_outputintr(dev, notify_only);
1054 }
1055 else
1056 do_outputintr(dev, notify_only);
1057 spin_unlock_irqrestore(&dmap->lock,flags);
1058 }
1059 EXPORT_SYMBOL(DMAbuf_outputintr);
1060
1061 /* called with dmap->lock held in irq context */
1062 static void do_inputintr(int dev)
1063 {
1064 struct audio_operations *adev = audio_devs[dev];
1065 struct dma_buffparms *dmap = adev->dmap_in;
1066
1067 if (dmap->raw_buf == NULL) {
1068 printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n");
1069 return;
1070 }
1071 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1072 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1073 if (dmap->qtail == 0) { /* Wrapped */
1074 dmap->byte_counter += dmap->bytes_in_use;
1075 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
1076 long decr = dmap->byte_counter;
1077 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
1078 decr -= dmap->byte_counter;
1079 dmap->user_counter -= decr;
1080 }
1081 }
1082 dmap->qlen++;
1083
1084 if (!(adev->flags & DMA_AUTOMODE)) {
1085 if (dmap->needs_reorg)
1086 reorganize_buffers(dev, dmap, 0);
1087 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ);
1088 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
1089 dmap->fragment_size, 1);
1090 if (adev->d->trigger)
1091 adev->d->trigger(dev, adev->enable_bits * adev->go);
1092 }
1093 dmap->flags |= DMA_ACTIVE;
1094 } else if (dmap->qlen >= (dmap->nbufs - 1)) {
1095 printk(KERN_WARNING "Sound: Recording overrun\n");
1096 dmap->underrun_count++;
1097
1098 /* Just throw away the oldest fragment but keep the engine running */
1099 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
1100 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1101 } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) {
1102 dmap->qlen++;
1103 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1104 if (dmap->qtail == 0) { /* Wrapped */
1105 dmap->byte_counter += dmap->bytes_in_use;
1106 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */
1107 long decr = dmap->byte_counter;
1108 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
1109 decr -= dmap->byte_counter;
1110 dmap->user_counter -= decr;
1111 }
1112 }
1113 }
1114 if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
1115 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
1116 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1);
1117 if (adev->d->trigger)
1118 adev->d->trigger(dev,adev->enable_bits * adev->go);
1119 }
1120 dmap->flags |= DMA_ACTIVE;
1121 if (dmap->qlen > 0)
1122 {
1123 wake_up(&adev->in_sleeper);
1124 wake_up(&adev->poll_sleeper);
1125 }
1126 }
1127 /* called in irq context */
1128 void DMAbuf_inputintr(int dev)
1129 {
1130 struct audio_operations *adev = audio_devs[dev];
1131 struct dma_buffparms *dmap = adev->dmap_in;
1132 unsigned long flags;
1133
1134 spin_lock_irqsave(&dmap->lock,flags);
1135
1136 if (!(dmap->flags & DMA_NODMA)) {
1137 int chan = dmap->dma, pos, n;
1138 unsigned long f;
1139
1140 f=claim_dma_lock();
1141 if(!isa_dma_bridge_buggy)
1142 disable_dma(dmap->dma);
1143 clear_dma_ff(chan);
1144 pos = dmap->bytes_in_use - get_dma_residue(chan);
1145 if(!isa_dma_bridge_buggy)
1146 enable_dma(dmap->dma);
1147 release_dma_lock(f);
1148
1149 pos = pos / dmap->fragment_size; /* Actual qhead */
1150 if (pos < 0 || pos >= dmap->nbufs)
1151 pos = 0;
1152
1153 n = 0;
1154 while (dmap->qtail != pos && ++n < dmap->nbufs)
1155 do_inputintr(dev);
1156 } else
1157 do_inputintr(dev);
1158 spin_unlock_irqrestore(&dmap->lock,flags);
1159 }
1160 EXPORT_SYMBOL(DMAbuf_inputintr);
1161
1162 void DMAbuf_init(int dev, int dma1, int dma2)
1163 {
1164 struct audio_operations *adev = audio_devs[dev];
1165 /*
1166 * NOTE! This routine could be called several times.
1167 */
1168
1169 if (adev && adev->dmap_out == NULL) {
1170 if (adev->d == NULL)
1171 panic("OSS: audio_devs[%d]->d == NULL\n", dev);
1172
1173 if (adev->parent_dev) { /* Use DMA map of the parent dev */
1174 int parent = adev->parent_dev - 1;
1175 adev->dmap_out = audio_devs[parent]->dmap_out;
1176 adev->dmap_in = audio_devs[parent]->dmap_in;
1177 } else {
1178 adev->dmap_out = adev->dmap_in = &adev->dmaps[0];
1179 adev->dmap_out->dma = dma1;
1180 if (adev->flags & DMA_DUPLEX) {
1181 adev->dmap_in = &adev->dmaps[1];
1182 adev->dmap_in->dma = dma2;
1183 }
1184 }
1185 /* Persistent DMA buffers allocated here */
1186 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
1187 if (adev->dmap_in->raw_buf == NULL)
1188 sound_alloc_dmap(adev->dmap_in);
1189 if (adev->dmap_out->raw_buf == NULL)
1190 sound_alloc_dmap(adev->dmap_out);
1191 }
1192 }
1193 }
1194
1195 /* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */
1196 static unsigned int poll_input(struct file * file, int dev, poll_table *wait)
1197 {
1198 struct audio_operations *adev = audio_devs[dev];
1199 struct dma_buffparms *dmap = adev->dmap_in;
1200
1201 if (!(adev->open_mode & OPEN_READ))
1202 return 0;
1203 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1204 if (dmap->qlen)
1205 return POLLIN | POLLRDNORM;
1206 return 0;
1207 }
1208 if (dmap->dma_mode != DMODE_INPUT) {
1209 if (dmap->dma_mode == DMODE_NONE &&
1210 adev->enable_bits & PCM_ENABLE_INPUT &&
1211 !dmap->qlen && adev->go) {
1212 unsigned long flags;
1213
1214 spin_lock_irqsave(&dmap->lock,flags);
1215 DMAbuf_activate_recording(dev, dmap);
1216 spin_unlock_irqrestore(&dmap->lock,flags);
1217 }
1218 return 0;
1219 }
1220 if (!dmap->qlen)
1221 return 0;
1222 return POLLIN | POLLRDNORM;
1223 }
1224
1225 static unsigned int poll_output(struct file * file, int dev, poll_table *wait)
1226 {
1227 struct audio_operations *adev = audio_devs[dev];
1228 struct dma_buffparms *dmap = adev->dmap_out;
1229
1230 if (!(adev->open_mode & OPEN_WRITE))
1231 return 0;
1232 if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1233 if (dmap->qlen)
1234 return POLLOUT | POLLWRNORM;
1235 return 0;
1236 }
1237 if (dmap->dma_mode == DMODE_INPUT)
1238 return 0;
1239 if (dmap->dma_mode == DMODE_NONE)
1240 return POLLOUT | POLLWRNORM;
1241 if (!DMAbuf_space_in_queue(dev))
1242 return 0;
1243 return POLLOUT | POLLWRNORM;
1244 }
1245
1246 unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait)
1247 {
1248 struct audio_operations *adev = audio_devs[dev];
1249 poll_wait(file, &adev->poll_sleeper, wait);
1250 return poll_input(file, dev, wait) | poll_output(file, dev, wait);
1251 }
1252
1253 void DMAbuf_deinit(int dev)
1254 {
1255 struct audio_operations *adev = audio_devs[dev];
1256 /* This routine is called when driver is being unloaded */
1257 if (!adev)
1258 return;
1259
1260 /* Persistent DMA buffers deallocated here */
1261 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
1262 sound_free_dmap(adev->dmap_out);
1263 if (adev->flags & DMA_DUPLEX)
1264 sound_free_dmap(adev->dmap_in);
1265 }
1266 }
Tomato firmware and modifications.