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Linux/sound/oss/dmabuf.c

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

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