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