1 /*
2 * sound/oss/audio.c
3 *
4 * Device file manager for /dev/audio
5 */
6
7 /*
8 * Copyright (C) by Hannu Savolainen 1993-1997
9 *
10 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
11 * Version 2 (June 1991). See the "COPYING" file distributed with this software
12 * for more info.
13 */
14 /*
15 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
16 * Thomas Sailer : moved several static variables into struct audio_operations
17 * (which is grossly misnamed btw.) because they have the same
18 * lifetime as the rest in there and dynamic allocation saves
19 * 12k or so
20 * Thomas Sailer : use more logical O_NONBLOCK semantics
21 * Daniel Rodriksson: reworked the use of the device specific copy_user
22 * still generic
23 * Horst von Brand: Add missing #include <linux/string.h>
24 * Chris Rankin : Update the module-usage counter for the coprocessor,
25 * and decrement the counters again if we cannot open
26 * the audio device.
27 */
28
29 #include <linux/stddef.h>
30 #include <linux/string.h>
31 #include <linux/kmod.h>
32
33 #include "sound_config.h"
34 #include "ulaw.h"
35 #include "coproc.h"
36
37 #define NEUTRAL8 0x80
38 #define NEUTRAL16 0x00
39
40
41 static int dma_ioctl(int dev, unsigned int cmd, void __user *arg);
42
set_format(int dev,int fmt)43 static int set_format(int dev, int fmt)
44 {
45 if (fmt != AFMT_QUERY)
46 {
47 audio_devs[dev]->local_conversion = 0;
48
49 if (!(audio_devs[dev]->format_mask & fmt)) /* Not supported */
50 {
51 if (fmt == AFMT_MU_LAW)
52 {
53 fmt = AFMT_U8;
54 audio_devs[dev]->local_conversion = CNV_MU_LAW;
55 }
56 else
57 fmt = AFMT_U8; /* This is always supported */
58 }
59 audio_devs[dev]->audio_format = audio_devs[dev]->d->set_bits(dev, fmt);
60 audio_devs[dev]->local_format = fmt;
61 }
62 else
63 return audio_devs[dev]->local_format;
64
65 if (audio_devs[dev]->local_conversion)
66 return audio_devs[dev]->local_conversion;
67 else
68 return audio_devs[dev]->local_format;
69 }
70
audio_open(int dev,struct file * file)71 int audio_open(int dev, struct file *file)
72 {
73 int ret;
74 int bits;
75 int dev_type = dev & 0x0f;
76 int mode = translate_mode(file);
77 const struct audio_driver *driver;
78 const struct coproc_operations *coprocessor;
79
80 dev = dev >> 4;
81
82 if (dev_type == SND_DEV_DSP16)
83 bits = 16;
84 else
85 bits = 8;
86
87 if (dev < 0 || dev >= num_audiodevs)
88 return -ENXIO;
89
90 driver = audio_devs[dev]->d;
91
92 if (!try_module_get(driver->owner))
93 return -ENODEV;
94
95 if ((ret = DMAbuf_open(dev, mode)) < 0)
96 goto error_1;
97
98 if ( (coprocessor = audio_devs[dev]->coproc) != NULL ) {
99 if (!try_module_get(coprocessor->owner))
100 goto error_2;
101
102 if ((ret = coprocessor->open(coprocessor->devc, COPR_PCM)) < 0) {
103 printk(KERN_WARNING "Sound: Can't access coprocessor device\n");
104 goto error_3;
105 }
106 }
107
108 audio_devs[dev]->local_conversion = 0;
109
110 if (dev_type == SND_DEV_AUDIO)
111 set_format(dev, AFMT_MU_LAW);
112 else
113 set_format(dev, bits);
114
115 audio_devs[dev]->audio_mode = AM_NONE;
116
117 return 0;
118
119 /*
120 * Clean-up stack: this is what needs (un)doing if
121 * we can't open the audio device ...
122 */
123 error_3:
124 module_put(coprocessor->owner);
125
126 error_2:
127 DMAbuf_release(dev, mode);
128
129 error_1:
130 module_put(driver->owner);
131
132 return ret;
133 }
134
sync_output(int dev)135 static void sync_output(int dev)
136 {
137 int p, i;
138 int l;
139 struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
140
141 if (dmap->fragment_size <= 0)
142 return;
143 dmap->flags |= DMA_POST;
144
145 /* Align the write pointer with fragment boundaries */
146
147 if ((l = dmap->user_counter % dmap->fragment_size) > 0)
148 {
149 int len;
150 unsigned long offs = dmap->user_counter % dmap->bytes_in_use;
151
152 len = dmap->fragment_size - l;
153 memset(dmap->raw_buf + offs, dmap->neutral_byte, len);
154 DMAbuf_move_wrpointer(dev, len);
155 }
156
157 /*
158 * Clean all unused buffer fragments.
159 */
160
161 p = dmap->qtail;
162 dmap->flags |= DMA_POST;
163
164 for (i = dmap->qlen + 1; i < dmap->nbufs; i++)
165 {
166 p = (p + 1) % dmap->nbufs;
167 if (((dmap->raw_buf + p * dmap->fragment_size) + dmap->fragment_size) >
168 (dmap->raw_buf + dmap->buffsize))
169 printk(KERN_ERR "audio: Buffer error 2\n");
170
171 memset(dmap->raw_buf + p * dmap->fragment_size,
172 dmap->neutral_byte,
173 dmap->fragment_size);
174 }
175
176 dmap->flags |= DMA_DIRTY;
177 }
178
audio_release(int dev,struct file * file)179 void audio_release(int dev, struct file *file)
180 {
181 const struct coproc_operations *coprocessor;
182 int mode = translate_mode(file);
183
184 dev = dev >> 4;
185
186 /*
187 * We do this in DMAbuf_release(). Why are we doing it
188 * here? Why don't we test the file mode before setting
189 * both flags? DMAbuf_release() does.
190 * ...pester...pester...pester...
191 */
192 audio_devs[dev]->dmap_out->closing = 1;
193 audio_devs[dev]->dmap_in->closing = 1;
194
195 /*
196 * We need to make sure we allocated the dmap_out buffer
197 * before we go mucking around with it in sync_output().
198 */
199 if (mode & OPEN_WRITE)
200 sync_output(dev);
201
202 if ( (coprocessor = audio_devs[dev]->coproc) != NULL ) {
203 coprocessor->close(coprocessor->devc, COPR_PCM);
204 module_put(coprocessor->owner);
205 }
206 DMAbuf_release(dev, mode);
207
208 module_put(audio_devs[dev]->d->owner);
209 }
210
translate_bytes(const unsigned char * table,unsigned char * buff,int n)211 static void translate_bytes(const unsigned char *table, unsigned char *buff, int n)
212 {
213 unsigned long i;
214
215 if (n <= 0)
216 return;
217
218 for (i = 0; i < n; ++i)
219 buff[i] = table[buff[i]];
220 }
221
audio_write(int dev,struct file * file,const char __user * buf,int count)222 int audio_write(int dev, struct file *file, const char __user *buf, int count)
223 {
224 int c, p, l, buf_size, used, returned;
225 int err;
226 char *dma_buf;
227
228 dev = dev >> 4;
229
230 p = 0;
231 c = count;
232
233 if(count < 0)
234 return -EINVAL;
235
236 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
237 return -EPERM;
238
239 if (audio_devs[dev]->flags & DMA_DUPLEX)
240 audio_devs[dev]->audio_mode |= AM_WRITE;
241 else
242 audio_devs[dev]->audio_mode = AM_WRITE;
243
244 if (!count) /* Flush output */
245 {
246 sync_output(dev);
247 return 0;
248 }
249
250 while (c)
251 {
252 if ((err = DMAbuf_getwrbuffer(dev, &dma_buf, &buf_size, !!(file->f_flags & O_NONBLOCK))) < 0)
253 {
254 /* Handle nonblocking mode */
255 if ((file->f_flags & O_NONBLOCK) && err == -EAGAIN)
256 return p? p : -EAGAIN; /* No more space. Return # of accepted bytes */
257 return err;
258 }
259 l = c;
260
261 if (l > buf_size)
262 l = buf_size;
263
264 returned = l;
265 used = l;
266 if (!audio_devs[dev]->d->copy_user)
267 {
268 if ((dma_buf + l) >
269 (audio_devs[dev]->dmap_out->raw_buf + audio_devs[dev]->dmap_out->buffsize))
270 {
271 printk(KERN_ERR "audio: Buffer error 3 (%lx,%d), (%lx, %d)\n", (long) dma_buf, l, (long) audio_devs[dev]->dmap_out->raw_buf, (int) audio_devs[dev]->dmap_out->buffsize);
272 return -EDOM;
273 }
274 if (dma_buf < audio_devs[dev]->dmap_out->raw_buf)
275 {
276 printk(KERN_ERR "audio: Buffer error 13 (%lx<%lx)\n", (long) dma_buf, (long) audio_devs[dev]->dmap_out->raw_buf);
277 return -EDOM;
278 }
279 if(copy_from_user(dma_buf, &(buf)[p], l))
280 return -EFAULT;
281 }
282 else audio_devs[dev]->d->copy_user (dev,
283 dma_buf, 0,
284 buf, p,
285 c, buf_size,
286 &used, &returned,
287 l);
288 l = returned;
289
290 if (audio_devs[dev]->local_conversion & CNV_MU_LAW)
291 {
292 translate_bytes(ulaw_dsp, (unsigned char *) dma_buf, l);
293 }
294 c -= used;
295 p += used;
296 DMAbuf_move_wrpointer(dev, l);
297
298 }
299
300 return count;
301 }
302
audio_read(int dev,struct file * file,char __user * buf,int count)303 int audio_read(int dev, struct file *file, char __user *buf, int count)
304 {
305 int c, p, l;
306 char *dmabuf;
307 int buf_no;
308
309 dev = dev >> 4;
310 p = 0;
311 c = count;
312
313 if (!(audio_devs[dev]->open_mode & OPEN_READ))
314 return -EPERM;
315
316 if ((audio_devs[dev]->audio_mode & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
317 sync_output(dev);
318
319 if (audio_devs[dev]->flags & DMA_DUPLEX)
320 audio_devs[dev]->audio_mode |= AM_READ;
321 else
322 audio_devs[dev]->audio_mode = AM_READ;
323
324 while(c)
325 {
326 if ((buf_no = DMAbuf_getrdbuffer(dev, &dmabuf, &l, !!(file->f_flags & O_NONBLOCK))) < 0)
327 {
328 /*
329 * Nonblocking mode handling. Return current # of bytes
330 */
331
332 if (p > 0) /* Avoid throwing away data */
333 return p; /* Return it instead */
334
335 if ((file->f_flags & O_NONBLOCK) && buf_no == -EAGAIN)
336 return -EAGAIN;
337
338 return buf_no;
339 }
340 if (l > c)
341 l = c;
342
343 /*
344 * Insert any local processing here.
345 */
346
347 if (audio_devs[dev]->local_conversion & CNV_MU_LAW)
348 {
349 translate_bytes(dsp_ulaw, (unsigned char *) dmabuf, l);
350 }
351
352 {
353 char *fixit = dmabuf;
354
355 if(copy_to_user(&(buf)[p], fixit, l))
356 return -EFAULT;
357 };
358
359 DMAbuf_rmchars(dev, buf_no, l);
360
361 p += l;
362 c -= l;
363 }
364
365 return count - c;
366 }
367
audio_ioctl(int dev,struct file * file,unsigned int cmd,void __user * arg)368 int audio_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
369 {
370 int val, count;
371 unsigned long flags;
372 struct dma_buffparms *dmap;
373 int __user *p = arg;
374
375 dev = dev >> 4;
376
377 if (_IOC_TYPE(cmd) == 'C') {
378 if (audio_devs[dev]->coproc) /* Coprocessor ioctl */
379 return audio_devs[dev]->coproc->ioctl(audio_devs[dev]->coproc->devc, cmd, arg, 0);
380 /* else
381 printk(KERN_DEBUG"/dev/dsp%d: No coprocessor for this device\n", dev); */
382 return -ENXIO;
383 }
384 else switch (cmd)
385 {
386 case SNDCTL_DSP_SYNC:
387 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
388 return 0;
389 if (audio_devs[dev]->dmap_out->fragment_size == 0)
390 return 0;
391 sync_output(dev);
392 DMAbuf_sync(dev);
393 DMAbuf_reset(dev);
394 return 0;
395
396 case SNDCTL_DSP_POST:
397 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
398 return 0;
399 if (audio_devs[dev]->dmap_out->fragment_size == 0)
400 return 0;
401 audio_devs[dev]->dmap_out->flags |= DMA_POST | DMA_DIRTY;
402 sync_output(dev);
403 dma_ioctl(dev, SNDCTL_DSP_POST, NULL);
404 return 0;
405
406 case SNDCTL_DSP_RESET:
407 audio_devs[dev]->audio_mode = AM_NONE;
408 DMAbuf_reset(dev);
409 return 0;
410
411 case SNDCTL_DSP_GETFMTS:
412 val = audio_devs[dev]->format_mask | AFMT_MU_LAW;
413 break;
414
415 case SNDCTL_DSP_SETFMT:
416 if (get_user(val, p))
417 return -EFAULT;
418 val = set_format(dev, val);
419 break;
420
421 case SNDCTL_DSP_GETISPACE:
422 if (!(audio_devs[dev]->open_mode & OPEN_READ))
423 return 0;
424 if ((audio_devs[dev]->audio_mode & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
425 return -EBUSY;
426 return dma_ioctl(dev, cmd, arg);
427
428 case SNDCTL_DSP_GETOSPACE:
429 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
430 return -EPERM;
431 if ((audio_devs[dev]->audio_mode & AM_READ) && !(audio_devs[dev]->flags & DMA_DUPLEX))
432 return -EBUSY;
433 return dma_ioctl(dev, cmd, arg);
434
435 case SNDCTL_DSP_NONBLOCK:
436 spin_lock(&file->f_lock);
437 file->f_flags |= O_NONBLOCK;
438 spin_unlock(&file->f_lock);
439 return 0;
440
441 case SNDCTL_DSP_GETCAPS:
442 val = 1 | DSP_CAP_MMAP; /* Revision level of this ioctl() */
443 if (audio_devs[dev]->flags & DMA_DUPLEX &&
444 audio_devs[dev]->open_mode == OPEN_READWRITE)
445 val |= DSP_CAP_DUPLEX;
446 if (audio_devs[dev]->coproc)
447 val |= DSP_CAP_COPROC;
448 if (audio_devs[dev]->d->local_qlen) /* Device has hidden buffers */
449 val |= DSP_CAP_BATCH;
450 if (audio_devs[dev]->d->trigger) /* Supports SETTRIGGER */
451 val |= DSP_CAP_TRIGGER;
452 break;
453
454 case SOUND_PCM_WRITE_RATE:
455 if (get_user(val, p))
456 return -EFAULT;
457 val = audio_devs[dev]->d->set_speed(dev, val);
458 break;
459
460 case SOUND_PCM_READ_RATE:
461 val = audio_devs[dev]->d->set_speed(dev, 0);
462 break;
463
464 case SNDCTL_DSP_STEREO:
465 if (get_user(val, p))
466 return -EFAULT;
467 if (val > 1 || val < 0)
468 return -EINVAL;
469 val = audio_devs[dev]->d->set_channels(dev, val + 1) - 1;
470 break;
471
472 case SOUND_PCM_WRITE_CHANNELS:
473 if (get_user(val, p))
474 return -EFAULT;
475 val = audio_devs[dev]->d->set_channels(dev, val);
476 break;
477
478 case SOUND_PCM_READ_CHANNELS:
479 val = audio_devs[dev]->d->set_channels(dev, 0);
480 break;
481
482 case SOUND_PCM_READ_BITS:
483 val = audio_devs[dev]->d->set_bits(dev, 0);
484 break;
485
486 case SNDCTL_DSP_SETDUPLEX:
487 if (audio_devs[dev]->open_mode != OPEN_READWRITE)
488 return -EPERM;
489 return (audio_devs[dev]->flags & DMA_DUPLEX) ? 0 : -EIO;
490
491 case SNDCTL_DSP_PROFILE:
492 if (get_user(val, p))
493 return -EFAULT;
494 if (audio_devs[dev]->open_mode & OPEN_WRITE)
495 audio_devs[dev]->dmap_out->applic_profile = val;
496 if (audio_devs[dev]->open_mode & OPEN_READ)
497 audio_devs[dev]->dmap_in->applic_profile = val;
498 return 0;
499
500 case SNDCTL_DSP_GETODELAY:
501 dmap = audio_devs[dev]->dmap_out;
502 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
503 return -EINVAL;
504 if (!(dmap->flags & DMA_ALLOC_DONE))
505 {
506 val=0;
507 break;
508 }
509
510 spin_lock_irqsave(&dmap->lock,flags);
511 /* Compute number of bytes that have been played */
512 count = DMAbuf_get_buffer_pointer (dev, dmap, DMODE_OUTPUT);
513 if (count < dmap->fragment_size && dmap->qhead != 0)
514 count += dmap->bytes_in_use; /* Pointer wrap not handled yet */
515 count += dmap->byte_counter;
516
517 /* Subtract current count from the number of bytes written by app */
518 count = dmap->user_counter - count;
519 if (count < 0)
520 count = 0;
521 spin_unlock_irqrestore(&dmap->lock,flags);
522 val = count;
523 break;
524
525 default:
526 return dma_ioctl(dev, cmd, arg);
527 }
528 return put_user(val, p);
529 }
530
audio_init_devices(void)531 void audio_init_devices(void)
532 {
533 /*
534 * NOTE! This routine could be called several times during boot.
535 */
536 }
537
reorganize_buffers(int dev,struct dma_buffparms * dmap,int recording)538 void reorganize_buffers(int dev, struct dma_buffparms *dmap, int recording)
539 {
540 /*
541 * This routine breaks the physical device buffers to logical ones.
542 */
543
544 struct audio_operations *dsp_dev = audio_devs[dev];
545
546 unsigned i, n;
547 unsigned sr, nc, sz, bsz;
548
549 sr = dsp_dev->d->set_speed(dev, 0);
550 nc = dsp_dev->d->set_channels(dev, 0);
551 sz = dsp_dev->d->set_bits(dev, 0);
552
553 if (sz == 8)
554 dmap->neutral_byte = NEUTRAL8;
555 else
556 dmap->neutral_byte = NEUTRAL16;
557
558 if (sr < 1 || nc < 1 || sz < 1)
559 {
560 /* printk(KERN_DEBUG "Warning: Invalid PCM parameters[%d] sr=%d, nc=%d, sz=%d\n", dev, sr, nc, sz);*/
561 sr = DSP_DEFAULT_SPEED;
562 nc = 1;
563 sz = 8;
564 }
565
566 sz = sr * nc * sz;
567
568 sz /= 8; /* #bits -> #bytes */
569 dmap->data_rate = sz;
570
571 if (!dmap->needs_reorg)
572 return;
573 dmap->needs_reorg = 0;
574
575 if (dmap->fragment_size == 0)
576 {
577 /* Compute the fragment size using the default algorithm */
578
579 /*
580 * Compute a buffer size for time not exceeding 1 second.
581 * Usually this algorithm gives a buffer size for 0.5 to 1.0 seconds
582 * of sound (using the current speed, sample size and #channels).
583 */
584
585 bsz = dmap->buffsize;
586 while (bsz > sz)
587 bsz /= 2;
588
589 if (bsz == dmap->buffsize)
590 bsz /= 2; /* Needs at least 2 buffers */
591
592 /*
593 * Split the computed fragment to smaller parts. After 3.5a9
594 * the default subdivision is 4 which should give better
595 * results when recording.
596 */
597
598 if (dmap->subdivision == 0) /* Not already set */
599 {
600 dmap->subdivision = 4; /* Init to the default value */
601
602 if ((bsz / dmap->subdivision) > 4096)
603 dmap->subdivision *= 2;
604 if ((bsz / dmap->subdivision) < 4096)
605 dmap->subdivision = 1;
606 }
607 bsz /= dmap->subdivision;
608
609 if (bsz < 16)
610 bsz = 16; /* Just a sanity check */
611
612 dmap->fragment_size = bsz;
613 }
614 else
615 {
616 /*
617 * The process has specified the buffer size with SNDCTL_DSP_SETFRAGMENT or
618 * the buffer size computation has already been done.
619 */
620 if (dmap->fragment_size > (dmap->buffsize / 2))
621 dmap->fragment_size = (dmap->buffsize / 2);
622 bsz = dmap->fragment_size;
623 }
624
625 if (audio_devs[dev]->min_fragment)
626 if (bsz < (1 << audio_devs[dev]->min_fragment))
627 bsz = 1 << audio_devs[dev]->min_fragment;
628 if (audio_devs[dev]->max_fragment)
629 if (bsz > (1 << audio_devs[dev]->max_fragment))
630 bsz = 1 << audio_devs[dev]->max_fragment;
631 bsz &= ~0x07; /* Force size which is multiple of 8 bytes */
632 #ifdef OS_DMA_ALIGN_CHECK
633 OS_DMA_ALIGN_CHECK(bsz);
634 #endif
635
636 n = dmap->buffsize / bsz;
637 if (n > MAX_SUB_BUFFERS)
638 n = MAX_SUB_BUFFERS;
639 if (n > dmap->max_fragments)
640 n = dmap->max_fragments;
641
642 if (n < 2)
643 {
644 n = 2;
645 bsz /= 2;
646 }
647 dmap->nbufs = n;
648 dmap->bytes_in_use = n * bsz;
649 dmap->fragment_size = bsz;
650 dmap->max_byte_counter = (dmap->data_rate * 60 * 60) +
651 dmap->bytes_in_use; /* Approximately one hour */
652
653 if (dmap->raw_buf)
654 {
655 memset(dmap->raw_buf, dmap->neutral_byte, dmap->bytes_in_use);
656 }
657
658 for (i = 0; i < dmap->nbufs; i++)
659 {
660 dmap->counts[i] = 0;
661 }
662
663 dmap->flags |= DMA_ALLOC_DONE | DMA_EMPTY;
664 }
665
dma_subdivide(int dev,struct dma_buffparms * dmap,int fact)666 static int dma_subdivide(int dev, struct dma_buffparms *dmap, int fact)
667 {
668 if (fact == 0)
669 {
670 fact = dmap->subdivision;
671 if (fact == 0)
672 fact = 1;
673 return fact;
674 }
675 if (dmap->subdivision != 0 || dmap->fragment_size) /* Too late to change */
676 return -EINVAL;
677
678 if (fact > MAX_REALTIME_FACTOR)
679 return -EINVAL;
680
681 if (fact != 1 && fact != 2 && fact != 4 && fact != 8 && fact != 16)
682 return -EINVAL;
683
684 dmap->subdivision = fact;
685 return fact;
686 }
687
dma_set_fragment(int dev,struct dma_buffparms * dmap,int fact)688 static int dma_set_fragment(int dev, struct dma_buffparms *dmap, int fact)
689 {
690 int bytes, count;
691
692 if (fact == 0)
693 return -EIO;
694
695 if (dmap->subdivision != 0 ||
696 dmap->fragment_size) /* Too late to change */
697 return -EINVAL;
698
699 bytes = fact & 0xffff;
700 count = (fact >> 16) & 0x7fff;
701
702 if (count == 0)
703 count = MAX_SUB_BUFFERS;
704 else if (count < MAX_SUB_BUFFERS)
705 count++;
706
707 if (bytes < 4 || bytes > 17) /* <16 || > 512k */
708 return -EINVAL;
709
710 if (count < 2)
711 return -EINVAL;
712
713 if (audio_devs[dev]->min_fragment > 0)
714 if (bytes < audio_devs[dev]->min_fragment)
715 bytes = audio_devs[dev]->min_fragment;
716
717 if (audio_devs[dev]->max_fragment > 0)
718 if (bytes > audio_devs[dev]->max_fragment)
719 bytes = audio_devs[dev]->max_fragment;
720
721 #ifdef OS_DMA_MINBITS
722 if (bytes < OS_DMA_MINBITS)
723 bytes = OS_DMA_MINBITS;
724 #endif
725
726 dmap->fragment_size = (1 << bytes);
727 dmap->max_fragments = count;
728
729 if (dmap->fragment_size > dmap->buffsize)
730 dmap->fragment_size = dmap->buffsize;
731
732 if (dmap->fragment_size == dmap->buffsize &&
733 audio_devs[dev]->flags & DMA_AUTOMODE)
734 dmap->fragment_size /= 2; /* Needs at least 2 buffers */
735
736 dmap->subdivision = 1; /* Disable SNDCTL_DSP_SUBDIVIDE */
737 return bytes | ((count - 1) << 16);
738 }
739
dma_ioctl(int dev,unsigned int cmd,void __user * arg)740 static int dma_ioctl(int dev, unsigned int cmd, void __user *arg)
741 {
742 struct dma_buffparms *dmap_out = audio_devs[dev]->dmap_out;
743 struct dma_buffparms *dmap_in = audio_devs[dev]->dmap_in;
744 struct dma_buffparms *dmap;
745 audio_buf_info info;
746 count_info cinfo;
747 int fact, ret, changed, bits, count, err;
748 unsigned long flags;
749
750 switch (cmd)
751 {
752 case SNDCTL_DSP_SUBDIVIDE:
753 ret = 0;
754 if (get_user(fact, (int __user *)arg))
755 return -EFAULT;
756 if (audio_devs[dev]->open_mode & OPEN_WRITE)
757 ret = dma_subdivide(dev, dmap_out, fact);
758 if (ret < 0)
759 return ret;
760 if (audio_devs[dev]->open_mode != OPEN_WRITE ||
761 (audio_devs[dev]->flags & DMA_DUPLEX &&
762 audio_devs[dev]->open_mode & OPEN_READ))
763 ret = dma_subdivide(dev, dmap_in, fact);
764 if (ret < 0)
765 return ret;
766 break;
767
768 case SNDCTL_DSP_GETISPACE:
769 case SNDCTL_DSP_GETOSPACE:
770 dmap = dmap_out;
771 if (cmd == SNDCTL_DSP_GETISPACE && !(audio_devs[dev]->open_mode & OPEN_READ))
772 return -EINVAL;
773 if (cmd == SNDCTL_DSP_GETOSPACE && !(audio_devs[dev]->open_mode & OPEN_WRITE))
774 return -EINVAL;
775 if (cmd == SNDCTL_DSP_GETISPACE && audio_devs[dev]->flags & DMA_DUPLEX)
776 dmap = dmap_in;
777 if (dmap->mapping_flags & DMA_MAP_MAPPED)
778 return -EINVAL;
779 if (!(dmap->flags & DMA_ALLOC_DONE))
780 reorganize_buffers(dev, dmap, (cmd == SNDCTL_DSP_GETISPACE));
781 info.fragstotal = dmap->nbufs;
782 if (cmd == SNDCTL_DSP_GETISPACE)
783 info.fragments = dmap->qlen;
784 else
785 {
786 if (!DMAbuf_space_in_queue(dev))
787 info.fragments = 0;
788 else
789 {
790 info.fragments = DMAbuf_space_in_queue(dev);
791 if (audio_devs[dev]->d->local_qlen)
792 {
793 int tmp = audio_devs[dev]->d->local_qlen(dev);
794 if (tmp && info.fragments)
795 tmp--; /*
796 * This buffer has been counted twice
797 */
798 info.fragments -= tmp;
799 }
800 }
801 }
802 if (info.fragments < 0)
803 info.fragments = 0;
804 else if (info.fragments > dmap->nbufs)
805 info.fragments = dmap->nbufs;
806
807 info.fragsize = dmap->fragment_size;
808 info.bytes = info.fragments * dmap->fragment_size;
809
810 if (cmd == SNDCTL_DSP_GETISPACE && dmap->qlen)
811 info.bytes -= dmap->counts[dmap->qhead];
812 else
813 {
814 info.fragments = info.bytes / dmap->fragment_size;
815 info.bytes -= dmap->user_counter % dmap->fragment_size;
816 }
817 if (copy_to_user(arg, &info, sizeof(info)))
818 return -EFAULT;
819 return 0;
820
821 case SNDCTL_DSP_SETTRIGGER:
822 if (get_user(bits, (int __user *)arg))
823 return -EFAULT;
824 bits &= audio_devs[dev]->open_mode;
825 if (audio_devs[dev]->d->trigger == NULL)
826 return -EINVAL;
827 if (!(audio_devs[dev]->flags & DMA_DUPLEX) && (bits & PCM_ENABLE_INPUT) &&
828 (bits & PCM_ENABLE_OUTPUT))
829 return -EINVAL;
830
831 if (bits & PCM_ENABLE_INPUT)
832 {
833 spin_lock_irqsave(&dmap_in->lock,flags);
834 changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_INPUT;
835 if (changed && audio_devs[dev]->go)
836 {
837 reorganize_buffers(dev, dmap_in, 1);
838 if ((err = audio_devs[dev]->d->prepare_for_input(dev,
839 dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
840 spin_unlock_irqrestore(&dmap_in->lock,flags);
841 return err;
842 }
843 dmap_in->dma_mode = DMODE_INPUT;
844 audio_devs[dev]->enable_bits |= PCM_ENABLE_INPUT;
845 DMAbuf_activate_recording(dev, dmap_in);
846 } else
847 audio_devs[dev]->enable_bits &= ~PCM_ENABLE_INPUT;
848 spin_unlock_irqrestore(&dmap_in->lock,flags);
849 }
850 if (bits & PCM_ENABLE_OUTPUT)
851 {
852 spin_lock_irqsave(&dmap_out->lock,flags);
853 changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_OUTPUT;
854 if (changed &&
855 (dmap_out->mapping_flags & DMA_MAP_MAPPED || dmap_out->qlen > 0) &&
856 audio_devs[dev]->go)
857 {
858 if (!(dmap_out->flags & DMA_ALLOC_DONE))
859 reorganize_buffers(dev, dmap_out, 0);
860 dmap_out->dma_mode = DMODE_OUTPUT;
861 audio_devs[dev]->enable_bits |= PCM_ENABLE_OUTPUT;
862 dmap_out->counts[dmap_out->qhead] = dmap_out->fragment_size;
863 DMAbuf_launch_output(dev, dmap_out);
864 } else
865 audio_devs[dev]->enable_bits &= ~PCM_ENABLE_OUTPUT;
866 spin_unlock_irqrestore(&dmap_out->lock,flags);
867 }
868 #if 0
869 if (changed && audio_devs[dev]->d->trigger)
870 audio_devs[dev]->d->trigger(dev, bits * audio_devs[dev]->go);
871 #endif
872 /* Falls through... */
873
874 case SNDCTL_DSP_GETTRIGGER:
875 ret = audio_devs[dev]->enable_bits;
876 break;
877
878 case SNDCTL_DSP_SETSYNCRO:
879 if (!audio_devs[dev]->d->trigger)
880 return -EINVAL;
881 audio_devs[dev]->d->trigger(dev, 0);
882 audio_devs[dev]->go = 0;
883 return 0;
884
885 case SNDCTL_DSP_GETIPTR:
886 if (!(audio_devs[dev]->open_mode & OPEN_READ))
887 return -EINVAL;
888 spin_lock_irqsave(&dmap_in->lock,flags);
889 cinfo.bytes = dmap_in->byte_counter;
890 cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_in, DMODE_INPUT) & ~3;
891 if (cinfo.ptr < dmap_in->fragment_size && dmap_in->qtail != 0)
892 cinfo.bytes += dmap_in->bytes_in_use; /* Pointer wrap not handled yet */
893 cinfo.blocks = dmap_in->qlen;
894 cinfo.bytes += cinfo.ptr;
895 if (dmap_in->mapping_flags & DMA_MAP_MAPPED)
896 dmap_in->qlen = 0; /* Reset interrupt counter */
897 spin_unlock_irqrestore(&dmap_in->lock,flags);
898 if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
899 return -EFAULT;
900 return 0;
901
902 case SNDCTL_DSP_GETOPTR:
903 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
904 return -EINVAL;
905
906 spin_lock_irqsave(&dmap_out->lock,flags);
907 cinfo.bytes = dmap_out->byte_counter;
908 cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_out, DMODE_OUTPUT) & ~3;
909 if (cinfo.ptr < dmap_out->fragment_size && dmap_out->qhead != 0)
910 cinfo.bytes += dmap_out->bytes_in_use; /* Pointer wrap not handled yet */
911 cinfo.blocks = dmap_out->qlen;
912 cinfo.bytes += cinfo.ptr;
913 if (dmap_out->mapping_flags & DMA_MAP_MAPPED)
914 dmap_out->qlen = 0; /* Reset interrupt counter */
915 spin_unlock_irqrestore(&dmap_out->lock,flags);
916 if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
917 return -EFAULT;
918 return 0;
919
920 case SNDCTL_DSP_GETODELAY:
921 if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
922 return -EINVAL;
923 if (!(dmap_out->flags & DMA_ALLOC_DONE))
924 {
925 ret=0;
926 break;
927 }
928 spin_lock_irqsave(&dmap_out->lock,flags);
929 /* Compute number of bytes that have been played */
930 count = DMAbuf_get_buffer_pointer (dev, dmap_out, DMODE_OUTPUT);
931 if (count < dmap_out->fragment_size && dmap_out->qhead != 0)
932 count += dmap_out->bytes_in_use; /* Pointer wrap not handled yet */
933 count += dmap_out->byte_counter;
934 /* Subtract current count from the number of bytes written by app */
935 count = dmap_out->user_counter - count;
936 if (count < 0)
937 count = 0;
938 spin_unlock_irqrestore(&dmap_out->lock,flags);
939 ret = count;
940 break;
941
942 case SNDCTL_DSP_POST:
943 if (audio_devs[dev]->dmap_out->qlen > 0)
944 if (!(audio_devs[dev]->dmap_out->flags & DMA_ACTIVE))
945 DMAbuf_launch_output(dev, audio_devs[dev]->dmap_out);
946 return 0;
947
948 case SNDCTL_DSP_GETBLKSIZE:
949 dmap = dmap_out;
950 if (audio_devs[dev]->open_mode & OPEN_WRITE)
951 reorganize_buffers(dev, dmap_out, (audio_devs[dev]->open_mode == OPEN_READ));
952 if (audio_devs[dev]->open_mode == OPEN_READ ||
953 (audio_devs[dev]->flags & DMA_DUPLEX &&
954 audio_devs[dev]->open_mode & OPEN_READ))
955 reorganize_buffers(dev, dmap_in, (audio_devs[dev]->open_mode == OPEN_READ));
956 if (audio_devs[dev]->open_mode == OPEN_READ)
957 dmap = dmap_in;
958 ret = dmap->fragment_size;
959 break;
960
961 case SNDCTL_DSP_SETFRAGMENT:
962 ret = 0;
963 if (get_user(fact, (int __user *)arg))
964 return -EFAULT;
965 if (audio_devs[dev]->open_mode & OPEN_WRITE)
966 ret = dma_set_fragment(dev, dmap_out, fact);
967 if (ret < 0)
968 return ret;
969 if (audio_devs[dev]->open_mode == OPEN_READ ||
970 (audio_devs[dev]->flags & DMA_DUPLEX &&
971 audio_devs[dev]->open_mode & OPEN_READ))
972 ret = dma_set_fragment(dev, dmap_in, fact);
973 if (ret < 0)
974 return ret;
975 if (!arg) /* don't know what this is good for, but preserve old semantics */
976 return 0;
977 break;
978
979 default:
980 if (!audio_devs[dev]->d->ioctl)
981 return -EINVAL;
982 return audio_devs[dev]->d->ioctl(dev, cmd, arg);
983 }
984 return put_user(ret, (int __user *)arg);
985 }
986