[PATCH] update OBSOLETE_OSS_DRIVER schedule and dependencies
[linux-2.6] / sound / oss / audio.c
1 /*
2  * sound/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
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
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
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
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
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
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
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
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                         file->f_flags |= O_NONBLOCK;
437                         return 0;
438
439                 case SNDCTL_DSP_GETCAPS:
440                                 val = 1 | DSP_CAP_MMAP; /* Revision level of this ioctl() */
441                                 if (audio_devs[dev]->flags & DMA_DUPLEX &&
442                                         audio_devs[dev]->open_mode == OPEN_READWRITE)
443                                         val |= DSP_CAP_DUPLEX;
444                                 if (audio_devs[dev]->coproc)
445                                         val |= DSP_CAP_COPROC;
446                                 if (audio_devs[dev]->d->local_qlen)     /* Device has hidden buffers */
447                                         val |= DSP_CAP_BATCH;
448                                 if (audio_devs[dev]->d->trigger)        /* Supports SETTRIGGER */
449                                         val |= DSP_CAP_TRIGGER;
450                                 break;
451                         
452                 case SOUND_PCM_WRITE_RATE:
453                         if (get_user(val, p))
454                                 return -EFAULT;
455                         val = audio_devs[dev]->d->set_speed(dev, val);
456                         break;
457
458                 case SOUND_PCM_READ_RATE:
459                         val = audio_devs[dev]->d->set_speed(dev, 0);
460                         break;
461                         
462                 case SNDCTL_DSP_STEREO:
463                         if (get_user(val, p))
464                                 return -EFAULT;
465                         if (val > 1 || val < 0)
466                                 return -EINVAL;
467                         val = audio_devs[dev]->d->set_channels(dev, val + 1) - 1;
468                         break;
469
470                 case SOUND_PCM_WRITE_CHANNELS:
471                         if (get_user(val, p))
472                                 return -EFAULT;
473                         val = audio_devs[dev]->d->set_channels(dev, val);
474                         break;
475
476                 case SOUND_PCM_READ_CHANNELS:
477                         val = audio_devs[dev]->d->set_channels(dev, 0);
478                         break;
479                 
480                 case SOUND_PCM_READ_BITS:
481                         val = audio_devs[dev]->d->set_bits(dev, 0);
482                         break;
483
484                 case SNDCTL_DSP_SETDUPLEX:
485                         if (audio_devs[dev]->open_mode != OPEN_READWRITE)
486                                 return -EPERM;
487                         return (audio_devs[dev]->flags & DMA_DUPLEX) ? 0 : -EIO;
488
489                 case SNDCTL_DSP_PROFILE:
490                         if (get_user(val, p))
491                                 return -EFAULT;
492                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
493                                 audio_devs[dev]->dmap_out->applic_profile = val;
494                         if (audio_devs[dev]->open_mode & OPEN_READ)
495                                 audio_devs[dev]->dmap_in->applic_profile = val;
496                         return 0;
497                 
498                 case SNDCTL_DSP_GETODELAY:
499                         dmap = audio_devs[dev]->dmap_out;
500                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
501                                 return -EINVAL;
502                         if (!(dmap->flags & DMA_ALLOC_DONE))
503                         {
504                                 val=0;
505                                 break;
506                         }
507                 
508                         spin_lock_irqsave(&dmap->lock,flags);
509                         /* Compute number of bytes that have been played */
510                         count = DMAbuf_get_buffer_pointer (dev, dmap, DMODE_OUTPUT);
511                         if (count < dmap->fragment_size && dmap->qhead != 0)
512                                 count += dmap->bytes_in_use;    /* Pointer wrap not handled yet */
513                         count += dmap->byte_counter;
514                 
515                         /* Substract current count from the number of bytes written by app */
516                         count = dmap->user_counter - count;
517                         if (count < 0)
518                                 count = 0;
519                         spin_unlock_irqrestore(&dmap->lock,flags);
520                         val = count;
521                         break;
522                 
523                 default:
524                         return dma_ioctl(dev, cmd, arg);
525         }
526         return put_user(val, p);
527 }
528
529 void audio_init_devices(void)
530 {
531         /*
532          * NOTE! This routine could be called several times during boot.
533          */
534 }
535
536 void reorganize_buffers(int dev, struct dma_buffparms *dmap, int recording)
537 {
538         /*
539          * This routine breaks the physical device buffers to logical ones.
540          */
541
542         struct audio_operations *dsp_dev = audio_devs[dev];
543
544         unsigned i, n;
545         unsigned sr, nc, sz, bsz;
546
547         sr = dsp_dev->d->set_speed(dev, 0);
548         nc = dsp_dev->d->set_channels(dev, 0);
549         sz = dsp_dev->d->set_bits(dev, 0);
550
551         if (sz == 8)
552                 dmap->neutral_byte = NEUTRAL8;
553         else
554                 dmap->neutral_byte = NEUTRAL16;
555
556         if (sr < 1 || nc < 1 || sz < 1)
557         {
558 /*              printk(KERN_DEBUG "Warning: Invalid PCM parameters[%d] sr=%d, nc=%d, sz=%d\n", dev, sr, nc, sz);*/
559                 sr = DSP_DEFAULT_SPEED;
560                 nc = 1;
561                 sz = 8;
562         }
563         
564         sz = sr * nc * sz;
565
566         sz /= 8;                /* #bits -> #bytes */
567         dmap->data_rate = sz;
568
569         if (!dmap->needs_reorg)
570                 return;
571         dmap->needs_reorg = 0;
572
573         if (dmap->fragment_size == 0)
574         {       
575                 /* Compute the fragment size using the default algorithm */
576
577                 /*
578                  * Compute a buffer size for time not exceeding 1 second.
579                  * Usually this algorithm gives a buffer size for 0.5 to 1.0 seconds
580                  * of sound (using the current speed, sample size and #channels).
581                  */
582
583                 bsz = dmap->buffsize;
584                 while (bsz > sz)
585                         bsz /= 2;
586
587                 if (bsz == dmap->buffsize)
588                         bsz /= 2;       /* Needs at least 2 buffers */
589
590                 /*
591                  *    Split the computed fragment to smaller parts. After 3.5a9
592                  *      the default subdivision is 4 which should give better
593                  *      results when recording.
594                  */
595
596                 if (dmap->subdivision == 0)     /* Not already set */
597                 {
598                         dmap->subdivision = 4;  /* Init to the default value */
599
600                         if ((bsz / dmap->subdivision) > 4096)
601                                 dmap->subdivision *= 2;
602                         if ((bsz / dmap->subdivision) < 4096)
603                                 dmap->subdivision = 1;
604                 }
605                 bsz /= dmap->subdivision;
606
607                 if (bsz < 16)
608                         bsz = 16;       /* Just a sanity check */
609
610                 dmap->fragment_size = bsz;
611         }
612         else
613         {
614                 /*
615                  * The process has specified the buffer size with SNDCTL_DSP_SETFRAGMENT or
616                  * the buffer size computation has already been done.
617                  */
618                 if (dmap->fragment_size > (dmap->buffsize / 2))
619                         dmap->fragment_size = (dmap->buffsize / 2);
620                 bsz = dmap->fragment_size;
621         }
622
623         if (audio_devs[dev]->min_fragment)
624                 if (bsz < (1 << audio_devs[dev]->min_fragment))
625                         bsz = 1 << audio_devs[dev]->min_fragment;
626         if (audio_devs[dev]->max_fragment)
627                 if (bsz > (1 << audio_devs[dev]->max_fragment))
628                         bsz = 1 << audio_devs[dev]->max_fragment;
629         bsz &= ~0x07;           /* Force size which is multiple of 8 bytes */
630 #ifdef OS_DMA_ALIGN_CHECK
631         OS_DMA_ALIGN_CHECK(bsz);
632 #endif
633
634         n = dmap->buffsize / bsz;
635         if (n > MAX_SUB_BUFFERS)
636                 n = MAX_SUB_BUFFERS;
637         if (n > dmap->max_fragments)
638                 n = dmap->max_fragments;
639
640         if (n < 2)
641         {
642                 n = 2;
643                 bsz /= 2;
644         }
645         dmap->nbufs = n;
646         dmap->bytes_in_use = n * bsz;
647         dmap->fragment_size = bsz;
648         dmap->max_byte_counter = (dmap->data_rate * 60 * 60) +
649                         dmap->bytes_in_use;     /* Approximately one hour */
650
651         if (dmap->raw_buf)
652         {
653                 memset(dmap->raw_buf, dmap->neutral_byte, dmap->bytes_in_use);
654         }
655         
656         for (i = 0; i < dmap->nbufs; i++)
657         {
658                 dmap->counts[i] = 0;
659         }
660
661         dmap->flags |= DMA_ALLOC_DONE | DMA_EMPTY;
662 }
663
664 static int dma_subdivide(int dev, struct dma_buffparms *dmap, int fact)
665 {
666         if (fact == 0) 
667         {
668                 fact = dmap->subdivision;
669                 if (fact == 0)
670                         fact = 1;
671                 return fact;
672         }
673         if (dmap->subdivision != 0 || dmap->fragment_size)      /* Too late to change */
674                 return -EINVAL;
675
676         if (fact > MAX_REALTIME_FACTOR)
677                 return -EINVAL;
678
679         if (fact != 1 && fact != 2 && fact != 4 && fact != 8 && fact != 16)
680                 return -EINVAL;
681
682         dmap->subdivision = fact;
683         return fact;
684 }
685
686 static int dma_set_fragment(int dev, struct dma_buffparms *dmap, int fact)
687 {
688         int bytes, count;
689
690         if (fact == 0)
691                 return -EIO;
692
693         if (dmap->subdivision != 0 ||
694             dmap->fragment_size)        /* Too late to change */
695                 return -EINVAL;
696
697         bytes = fact & 0xffff;
698         count = (fact >> 16) & 0x7fff;
699
700         if (count == 0)
701                 count = MAX_SUB_BUFFERS;
702         else if (count < MAX_SUB_BUFFERS)
703                 count++;
704
705         if (bytes < 4 || bytes > 17)    /* <16 || > 512k */
706                 return -EINVAL;
707
708         if (count < 2)
709                 return -EINVAL;
710
711         if (audio_devs[dev]->min_fragment > 0)
712                 if (bytes < audio_devs[dev]->min_fragment)
713                         bytes = audio_devs[dev]->min_fragment;
714
715         if (audio_devs[dev]->max_fragment > 0)
716                 if (bytes > audio_devs[dev]->max_fragment)
717                         bytes = audio_devs[dev]->max_fragment;
718
719 #ifdef OS_DMA_MINBITS
720         if (bytes < OS_DMA_MINBITS)
721                 bytes = OS_DMA_MINBITS;
722 #endif
723
724         dmap->fragment_size = (1 << bytes);
725         dmap->max_fragments = count;
726
727         if (dmap->fragment_size > dmap->buffsize)
728                 dmap->fragment_size = dmap->buffsize;
729
730         if (dmap->fragment_size == dmap->buffsize &&
731             audio_devs[dev]->flags & DMA_AUTOMODE)
732                 dmap->fragment_size /= 2;       /* Needs at least 2 buffers */
733
734         dmap->subdivision = 1;  /* Disable SNDCTL_DSP_SUBDIVIDE */
735         return bytes | ((count - 1) << 16);
736 }
737
738 static int dma_ioctl(int dev, unsigned int cmd, void __user *arg)
739 {
740         struct dma_buffparms *dmap_out = audio_devs[dev]->dmap_out;
741         struct dma_buffparms *dmap_in = audio_devs[dev]->dmap_in;
742         struct dma_buffparms *dmap;
743         audio_buf_info info;
744         count_info cinfo;
745         int fact, ret, changed, bits, count, err;
746         unsigned long flags;
747
748         switch (cmd) 
749         {
750                 case SNDCTL_DSP_SUBDIVIDE:
751                         ret = 0;
752                         if (get_user(fact, (int __user *)arg))
753                                 return -EFAULT;
754                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
755                                 ret = dma_subdivide(dev, dmap_out, fact);
756                         if (ret < 0)
757                                 return ret;
758                         if (audio_devs[dev]->open_mode != OPEN_WRITE ||
759                                 (audio_devs[dev]->flags & DMA_DUPLEX &&
760                                         audio_devs[dev]->open_mode & OPEN_READ))
761                                 ret = dma_subdivide(dev, dmap_in, fact);
762                         if (ret < 0)
763                                 return ret;
764                         break;
765
766                 case SNDCTL_DSP_GETISPACE:
767                 case SNDCTL_DSP_GETOSPACE:
768                         dmap = dmap_out;
769                         if (cmd == SNDCTL_DSP_GETISPACE && !(audio_devs[dev]->open_mode & OPEN_READ))
770                                 return -EINVAL;
771                         if (cmd == SNDCTL_DSP_GETOSPACE && !(audio_devs[dev]->open_mode & OPEN_WRITE))
772                                 return -EINVAL;
773                         if (cmd == SNDCTL_DSP_GETISPACE && audio_devs[dev]->flags & DMA_DUPLEX)
774                                 dmap = dmap_in;
775                         if (dmap->mapping_flags & DMA_MAP_MAPPED)
776                                 return -EINVAL;
777                         if (!(dmap->flags & DMA_ALLOC_DONE))
778                                 reorganize_buffers(dev, dmap, (cmd == SNDCTL_DSP_GETISPACE));
779                         info.fragstotal = dmap->nbufs;
780                         if (cmd == SNDCTL_DSP_GETISPACE)
781                                 info.fragments = dmap->qlen;
782                         else 
783                         {
784                                 if (!DMAbuf_space_in_queue(dev))
785                                         info.fragments = 0;
786                                 else
787                                 {
788                                         info.fragments = DMAbuf_space_in_queue(dev);
789                                         if (audio_devs[dev]->d->local_qlen) 
790                                         {
791                                                 int tmp = audio_devs[dev]->d->local_qlen(dev);
792                                                 if (tmp && info.fragments)
793                                                         tmp--;  /*
794                                                                  * This buffer has been counted twice
795                                                                  */
796                                                 info.fragments -= tmp;
797                                         }
798                                 }
799                         }
800                         if (info.fragments < 0)
801                                 info.fragments = 0;
802                         else if (info.fragments > dmap->nbufs)
803                                 info.fragments = dmap->nbufs;
804
805                         info.fragsize = dmap->fragment_size;
806                         info.bytes = info.fragments * dmap->fragment_size;
807
808                         if (cmd == SNDCTL_DSP_GETISPACE && dmap->qlen)
809                                 info.bytes -= dmap->counts[dmap->qhead];
810                         else 
811                         {
812                                 info.fragments = info.bytes / dmap->fragment_size;
813                                 info.bytes -= dmap->user_counter % dmap->fragment_size;
814                         }
815                         if (copy_to_user(arg, &info, sizeof(info)))
816                                 return -EFAULT;
817                         return 0;
818
819                 case SNDCTL_DSP_SETTRIGGER:
820                         if (get_user(bits, (int __user *)arg))
821                                 return -EFAULT;
822                         bits &= audio_devs[dev]->open_mode;
823                         if (audio_devs[dev]->d->trigger == NULL)
824                                 return -EINVAL;
825                         if (!(audio_devs[dev]->flags & DMA_DUPLEX) && (bits & PCM_ENABLE_INPUT) &&
826                                 (bits & PCM_ENABLE_OUTPUT))
827                                 return -EINVAL;
828
829                         if (bits & PCM_ENABLE_INPUT)
830                         {
831                                 spin_lock_irqsave(&dmap_in->lock,flags);
832                                 changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_INPUT;
833                                 if (changed && audio_devs[dev]->go) 
834                                 {
835                                         reorganize_buffers(dev, dmap_in, 1);
836                                         if ((err = audio_devs[dev]->d->prepare_for_input(dev,
837                                                      dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
838                                                 spin_unlock_irqrestore(&dmap_in->lock,flags);
839                                                 return -err;
840                                         }
841                                         dmap_in->dma_mode = DMODE_INPUT;
842                                         audio_devs[dev]->enable_bits |= PCM_ENABLE_INPUT;
843                                         DMAbuf_activate_recording(dev, dmap_in);
844                                 } else
845                                         audio_devs[dev]->enable_bits &= ~PCM_ENABLE_INPUT;
846                                 spin_unlock_irqrestore(&dmap_in->lock,flags);
847                         }
848                         if (bits & PCM_ENABLE_OUTPUT)
849                         {
850                                 spin_lock_irqsave(&dmap_out->lock,flags);
851                                 changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_OUTPUT;
852                                 if (changed &&
853                                     (dmap_out->mapping_flags & DMA_MAP_MAPPED || dmap_out->qlen > 0) &&
854                                     audio_devs[dev]->go) 
855                                 {
856                                         if (!(dmap_out->flags & DMA_ALLOC_DONE))
857                                                 reorganize_buffers(dev, dmap_out, 0);
858                                         dmap_out->dma_mode = DMODE_OUTPUT;
859                                         audio_devs[dev]->enable_bits |= PCM_ENABLE_OUTPUT;
860                                         dmap_out->counts[dmap_out->qhead] = dmap_out->fragment_size;
861                                         DMAbuf_launch_output(dev, dmap_out);
862                                 } else
863                                         audio_devs[dev]->enable_bits &= ~PCM_ENABLE_OUTPUT;
864                                 spin_unlock_irqrestore(&dmap_out->lock,flags);
865                         }
866 #if 0
867                         if (changed && audio_devs[dev]->d->trigger)
868                                 audio_devs[dev]->d->trigger(dev, bits * audio_devs[dev]->go);
869 #endif                          
870                         /* Falls through... */
871
872                 case SNDCTL_DSP_GETTRIGGER:
873                         ret = audio_devs[dev]->enable_bits;
874                         break;
875
876                 case SNDCTL_DSP_SETSYNCRO:
877                         if (!audio_devs[dev]->d->trigger)
878                                 return -EINVAL;
879                         audio_devs[dev]->d->trigger(dev, 0);
880                         audio_devs[dev]->go = 0;
881                         return 0;
882
883                 case SNDCTL_DSP_GETIPTR:
884                         if (!(audio_devs[dev]->open_mode & OPEN_READ))
885                                 return -EINVAL;
886                         spin_lock_irqsave(&dmap_in->lock,flags);
887                         cinfo.bytes = dmap_in->byte_counter;
888                         cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_in, DMODE_INPUT) & ~3;
889                         if (cinfo.ptr < dmap_in->fragment_size && dmap_in->qtail != 0)
890                                 cinfo.bytes += dmap_in->bytes_in_use;   /* Pointer wrap not handled yet */
891                         cinfo.blocks = dmap_in->qlen;
892                         cinfo.bytes += cinfo.ptr;
893                         if (dmap_in->mapping_flags & DMA_MAP_MAPPED)
894                                 dmap_in->qlen = 0;      /* Reset interrupt counter */
895                         spin_unlock_irqrestore(&dmap_in->lock,flags);
896                         if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
897                                 return -EFAULT;
898                         return 0;
899
900                 case SNDCTL_DSP_GETOPTR:
901                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
902                                 return -EINVAL;
903
904                         spin_lock_irqsave(&dmap_out->lock,flags);
905                         cinfo.bytes = dmap_out->byte_counter;
906                         cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_out, DMODE_OUTPUT) & ~3;
907                         if (cinfo.ptr < dmap_out->fragment_size && dmap_out->qhead != 0)
908                                 cinfo.bytes += dmap_out->bytes_in_use;  /* Pointer wrap not handled yet */
909                         cinfo.blocks = dmap_out->qlen;
910                         cinfo.bytes += cinfo.ptr;
911                         if (dmap_out->mapping_flags & DMA_MAP_MAPPED)
912                                 dmap_out->qlen = 0;     /* Reset interrupt counter */
913                         spin_unlock_irqrestore(&dmap_out->lock,flags);
914                         if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
915                                 return -EFAULT;
916                         return 0;
917
918                 case SNDCTL_DSP_GETODELAY:
919                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
920                                 return -EINVAL;
921                         if (!(dmap_out->flags & DMA_ALLOC_DONE))
922                         {
923                                 ret=0;
924                                 break;
925                         }
926                         spin_lock_irqsave(&dmap_out->lock,flags);
927                         /* Compute number of bytes that have been played */
928                         count = DMAbuf_get_buffer_pointer (dev, dmap_out, DMODE_OUTPUT);
929                         if (count < dmap_out->fragment_size && dmap_out->qhead != 0)
930                                 count += dmap_out->bytes_in_use;        /* Pointer wrap not handled yet */
931                         count += dmap_out->byte_counter;
932                         /* Substract current count from the number of bytes written by app */
933                         count = dmap_out->user_counter - count;
934                         if (count < 0)
935                                 count = 0;
936                         spin_unlock_irqrestore(&dmap_out->lock,flags);
937                         ret = count;
938                         break;
939
940                 case SNDCTL_DSP_POST:
941                         if (audio_devs[dev]->dmap_out->qlen > 0)
942                                 if (!(audio_devs[dev]->dmap_out->flags & DMA_ACTIVE))
943                                         DMAbuf_launch_output(dev, audio_devs[dev]->dmap_out);
944                         return 0;
945
946                 case SNDCTL_DSP_GETBLKSIZE:
947                         dmap = dmap_out;
948                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
949                                 reorganize_buffers(dev, dmap_out, (audio_devs[dev]->open_mode == OPEN_READ));
950                         if (audio_devs[dev]->open_mode == OPEN_READ ||
951                             (audio_devs[dev]->flags & DMA_DUPLEX &&
952                              audio_devs[dev]->open_mode & OPEN_READ))
953                                 reorganize_buffers(dev, dmap_in, (audio_devs[dev]->open_mode == OPEN_READ));
954                         if (audio_devs[dev]->open_mode == OPEN_READ)
955                                 dmap = dmap_in;
956                         ret = dmap->fragment_size;
957                         break;
958
959                 case SNDCTL_DSP_SETFRAGMENT:
960                         ret = 0;
961                         if (get_user(fact, (int __user *)arg))
962                                 return -EFAULT;
963                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
964                                 ret = dma_set_fragment(dev, dmap_out, fact);
965                         if (ret < 0)
966                                 return ret;
967                         if (audio_devs[dev]->open_mode == OPEN_READ ||
968                             (audio_devs[dev]->flags & DMA_DUPLEX &&
969                              audio_devs[dev]->open_mode & OPEN_READ))
970                                 ret = dma_set_fragment(dev, dmap_in, fact);
971                         if (ret < 0)
972                                 return ret;
973                         if (!arg) /* don't know what this is good for, but preserve old semantics */
974                                 return 0;
975                         break;
976
977                 default:
978                         if (!audio_devs[dev]->d->ioctl)
979                                 return -EINVAL;
980                         return audio_devs[dev]->d->ioctl(dev, cmd, arg);
981         }
982         return put_user(ret, (int __user *)arg);
983 }