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TOMOYO Linux Cross Reference
Linux/sound/core/pcm_native.c

Version: ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  *  Digital Audio (PCM) abstract layer
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #include <linux/mm.h>
 23 #include <linux/module.h>
 24 #include <linux/file.h>
 25 #include <linux/slab.h>
 26 #include <linux/time.h>
 27 #include <linux/pm_qos.h>
 28 #include <linux/io.h>
 29 #include <linux/dma-mapping.h>
 30 #include <sound/core.h>
 31 #include <sound/control.h>
 32 #include <sound/info.h>
 33 #include <sound/pcm.h>
 34 #include <sound/pcm_params.h>
 35 #include <sound/timer.h>
 36 #include <sound/minors.h>
 37 #include <linux/uio.h>
 38 
 39 /*
 40  *  Compatibility
 41  */
 42 
 43 struct snd_pcm_hw_params_old {
 44         unsigned int flags;
 45         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
 46                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
 47         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
 48                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
 49         unsigned int rmask;
 50         unsigned int cmask;
 51         unsigned int info;
 52         unsigned int msbits;
 53         unsigned int rate_num;
 54         unsigned int rate_den;
 55         snd_pcm_uframes_t fifo_size;
 56         unsigned char reserved[64];
 57 };
 58 
 59 #ifdef CONFIG_SND_SUPPORT_OLD_API
 60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
 61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
 62 
 63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
 64                                       struct snd_pcm_hw_params_old __user * _oparams);
 65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
 66                                       struct snd_pcm_hw_params_old __user * _oparams);
 67 #endif
 68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
 69 
 70 /*
 71  *
 72  */
 73 
 74 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
 75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
 76 
 77 /* Writer in rwsem may block readers even during its waiting in queue,
 78  * and this may lead to a deadlock when the code path takes read sem
 79  * twice (e.g. one in snd_pcm_action_nonatomic() and another in
 80  * snd_pcm_stream_lock()).  As a (suboptimal) workaround, let writer to
 81  * spin until it gets the lock.
 82  */
 83 static inline void down_write_nonblock(struct rw_semaphore *lock)
 84 {
 85         while (!down_write_trylock(lock))
 86                 cond_resched();
 87 }
 88 
 89 /**
 90  * snd_pcm_stream_lock - Lock the PCM stream
 91  * @substream: PCM substream
 92  *
 93  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 94  * flag of the given substream.  This also takes the global link rw lock
 95  * (or rw sem), too, for avoiding the race with linked streams.
 96  */
 97 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 98 {
 99         if (substream->pcm->nonatomic) {
100                 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
101                 mutex_lock(&substream->self_group.mutex);
102         } else {
103                 read_lock(&snd_pcm_link_rwlock);
104                 spin_lock(&substream->self_group.lock);
105         }
106 }
107 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
108 
109 /**
110  * snd_pcm_stream_lock - Unlock the PCM stream
111  * @substream: PCM substream
112  *
113  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
114  */
115 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
116 {
117         if (substream->pcm->nonatomic) {
118                 mutex_unlock(&substream->self_group.mutex);
119                 up_read(&snd_pcm_link_rwsem);
120         } else {
121                 spin_unlock(&substream->self_group.lock);
122                 read_unlock(&snd_pcm_link_rwlock);
123         }
124 }
125 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
126 
127 /**
128  * snd_pcm_stream_lock_irq - Lock the PCM stream
129  * @substream: PCM substream
130  *
131  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
132  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
133  * as snd_pcm_stream_lock().
134  */
135 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
136 {
137         if (!substream->pcm->nonatomic)
138                 local_irq_disable();
139         snd_pcm_stream_lock(substream);
140 }
141 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
142 
143 /**
144  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
145  * @substream: PCM substream
146  *
147  * This is a counter-part of snd_pcm_stream_lock_irq().
148  */
149 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
150 {
151         snd_pcm_stream_unlock(substream);
152         if (!substream->pcm->nonatomic)
153                 local_irq_enable();
154 }
155 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
156 
157 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
158 {
159         unsigned long flags = 0;
160         if (!substream->pcm->nonatomic)
161                 local_irq_save(flags);
162         snd_pcm_stream_lock(substream);
163         return flags;
164 }
165 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
166 
167 /**
168  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
169  * @substream: PCM substream
170  * @flags: irq flags
171  *
172  * This is a counter-part of snd_pcm_stream_lock_irqsave().
173  */
174 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
175                                       unsigned long flags)
176 {
177         snd_pcm_stream_unlock(substream);
178         if (!substream->pcm->nonatomic)
179                 local_irq_restore(flags);
180 }
181 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
182 
183 static inline mm_segment_t snd_enter_user(void)
184 {
185         mm_segment_t fs = get_fs();
186         set_fs(get_ds());
187         return fs;
188 }
189 
190 static inline void snd_leave_user(mm_segment_t fs)
191 {
192         set_fs(fs);
193 }
194 
195 
196 
197 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
198 {
199         struct snd_pcm_runtime *runtime;
200         struct snd_pcm *pcm = substream->pcm;
201         struct snd_pcm_str *pstr = substream->pstr;
202 
203         memset(info, 0, sizeof(*info));
204         info->card = pcm->card->number;
205         info->device = pcm->device;
206         info->stream = substream->stream;
207         info->subdevice = substream->number;
208         strlcpy(info->id, pcm->id, sizeof(info->id));
209         strlcpy(info->name, pcm->name, sizeof(info->name));
210         info->dev_class = pcm->dev_class;
211         info->dev_subclass = pcm->dev_subclass;
212         info->subdevices_count = pstr->substream_count;
213         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
214         strlcpy(info->subname, substream->name, sizeof(info->subname));
215         runtime = substream->runtime;
216         /* AB: FIXME!!! This is definitely nonsense */
217         if (runtime) {
218                 info->sync = runtime->sync;
219                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
220         }
221         return 0;
222 }
223 
224 int snd_pcm_info_user(struct snd_pcm_substream *substream,
225                       struct snd_pcm_info __user * _info)
226 {
227         struct snd_pcm_info *info;
228         int err;
229 
230         info = kmalloc(sizeof(*info), GFP_KERNEL);
231         if (! info)
232                 return -ENOMEM;
233         err = snd_pcm_info(substream, info);
234         if (err >= 0) {
235                 if (copy_to_user(_info, info, sizeof(*info)))
236                         err = -EFAULT;
237         }
238         kfree(info);
239         return err;
240 }
241 
242 static bool hw_support_mmap(struct snd_pcm_substream *substream)
243 {
244         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
245                 return false;
246         /* check architectures that return -EINVAL from dma_mmap_coherent() */
247         /* FIXME: this should be some global flag */
248 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
249         defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
250         if (!substream->ops->mmap &&
251             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
252                 return false;
253 #endif
254         return true;
255 }
256 
257 #undef RULES_DEBUG
258 
259 #ifdef RULES_DEBUG
260 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
261 static const char * const snd_pcm_hw_param_names[] = {
262         HW_PARAM(ACCESS),
263         HW_PARAM(FORMAT),
264         HW_PARAM(SUBFORMAT),
265         HW_PARAM(SAMPLE_BITS),
266         HW_PARAM(FRAME_BITS),
267         HW_PARAM(CHANNELS),
268         HW_PARAM(RATE),
269         HW_PARAM(PERIOD_TIME),
270         HW_PARAM(PERIOD_SIZE),
271         HW_PARAM(PERIOD_BYTES),
272         HW_PARAM(PERIODS),
273         HW_PARAM(BUFFER_TIME),
274         HW_PARAM(BUFFER_SIZE),
275         HW_PARAM(BUFFER_BYTES),
276         HW_PARAM(TICK_TIME),
277 };
278 #endif
279 
280 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
281                       struct snd_pcm_hw_params *params)
282 {
283         unsigned int k;
284         struct snd_pcm_hardware *hw;
285         struct snd_interval *i = NULL;
286         struct snd_mask *m = NULL;
287         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
288         unsigned int rstamps[constrs->rules_num];
289         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
290         unsigned int stamp = 2;
291         int changed, again;
292 
293         params->info = 0;
294         params->fifo_size = 0;
295         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
296                 params->msbits = 0;
297         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
298                 params->rate_num = 0;
299                 params->rate_den = 0;
300         }
301 
302         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
303                 m = hw_param_mask(params, k);
304                 if (snd_mask_empty(m))
305                         return -EINVAL;
306                 if (!(params->rmask & (1 << k)))
307                         continue;
308 #ifdef RULES_DEBUG
309                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
310                 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
311 #endif
312                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
313 #ifdef RULES_DEBUG
314                 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
315 #endif
316                 if (changed)
317                         params->cmask |= 1 << k;
318                 if (changed < 0)
319                         return changed;
320         }
321 
322         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
323                 i = hw_param_interval(params, k);
324                 if (snd_interval_empty(i))
325                         return -EINVAL;
326                 if (!(params->rmask & (1 << k)))
327                         continue;
328 #ifdef RULES_DEBUG
329                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
330                 if (i->empty)
331                         pr_cont("empty");
332                 else
333                         pr_cont("%c%u %u%c",
334                                i->openmin ? '(' : '[', i->min,
335                                i->max, i->openmax ? ')' : ']');
336                 pr_cont(" -> ");
337 #endif
338                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
339 #ifdef RULES_DEBUG
340                 if (i->empty)
341                         pr_cont("empty\n");
342                 else 
343                         pr_cont("%c%u %u%c\n",
344                                i->openmin ? '(' : '[', i->min,
345                                i->max, i->openmax ? ')' : ']');
346 #endif
347                 if (changed)
348                         params->cmask |= 1 << k;
349                 if (changed < 0)
350                         return changed;
351         }
352 
353         for (k = 0; k < constrs->rules_num; k++)
354                 rstamps[k] = 0;
355         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
356                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357         do {
358                 again = 0;
359                 for (k = 0; k < constrs->rules_num; k++) {
360                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
361                         unsigned int d;
362                         int doit = 0;
363                         if (r->cond && !(r->cond & params->flags))
364                                 continue;
365                         for (d = 0; r->deps[d] >= 0; d++) {
366                                 if (vstamps[r->deps[d]] > rstamps[k]) {
367                                         doit = 1;
368                                         break;
369                                 }
370                         }
371                         if (!doit)
372                                 continue;
373 #ifdef RULES_DEBUG
374                         pr_debug("Rule %d [%p]: ", k, r->func);
375                         if (r->var >= 0) {
376                                 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
377                                 if (hw_is_mask(r->var)) {
378                                         m = hw_param_mask(params, r->var);
379                                         pr_cont("%x", *m->bits);
380                                 } else {
381                                         i = hw_param_interval(params, r->var);
382                                         if (i->empty)
383                                                 pr_cont("empty");
384                                         else
385                                                 pr_cont("%c%u %u%c",
386                                                        i->openmin ? '(' : '[', i->min,
387                                                        i->max, i->openmax ? ')' : ']');
388                                 }
389                         }
390 #endif
391                         changed = r->func(params, r);
392 #ifdef RULES_DEBUG
393                         if (r->var >= 0) {
394                                 pr_cont(" -> ");
395                                 if (hw_is_mask(r->var))
396                                         pr_cont("%x", *m->bits);
397                                 else {
398                                         if (i->empty)
399                                                 pr_cont("empty");
400                                         else
401                                                 pr_cont("%c%u %u%c",
402                                                        i->openmin ? '(' : '[', i->min,
403                                                        i->max, i->openmax ? ')' : ']');
404                                 }
405                         }
406                         pr_cont("\n");
407 #endif
408                         rstamps[k] = stamp;
409                         if (changed && r->var >= 0) {
410                                 params->cmask |= (1 << r->var);
411                                 vstamps[r->var] = stamp;
412                                 again = 1;
413                         }
414                         if (changed < 0)
415                                 return changed;
416                         stamp++;
417                 }
418         } while (again);
419         if (!params->msbits) {
420                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
421                 if (snd_interval_single(i))
422                         params->msbits = snd_interval_value(i);
423         }
424 
425         if (!params->rate_den) {
426                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
427                 if (snd_interval_single(i)) {
428                         params->rate_num = snd_interval_value(i);
429                         params->rate_den = 1;
430                 }
431         }
432 
433         hw = &substream->runtime->hw;
434         if (!params->info) {
435                 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
436                                             SNDRV_PCM_INFO_DRAIN_TRIGGER);
437                 if (!hw_support_mmap(substream))
438                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
439                                           SNDRV_PCM_INFO_MMAP_VALID);
440         }
441         if (!params->fifo_size) {
442                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
443                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
444                 if (snd_mask_min(m) == snd_mask_max(m) &&
445                     snd_interval_min(i) == snd_interval_max(i)) {
446                         changed = substream->ops->ioctl(substream,
447                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
448                         if (changed < 0)
449                                 return changed;
450                 }
451         }
452         params->rmask = 0;
453         return 0;
454 }
455 
456 EXPORT_SYMBOL(snd_pcm_hw_refine);
457 
458 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
459                                   struct snd_pcm_hw_params __user * _params)
460 {
461         struct snd_pcm_hw_params *params;
462         int err;
463 
464         params = memdup_user(_params, sizeof(*params));
465         if (IS_ERR(params))
466                 return PTR_ERR(params);
467 
468         err = snd_pcm_hw_refine(substream, params);
469         if (copy_to_user(_params, params, sizeof(*params))) {
470                 if (!err)
471                         err = -EFAULT;
472         }
473 
474         kfree(params);
475         return err;
476 }
477 
478 static int period_to_usecs(struct snd_pcm_runtime *runtime)
479 {
480         int usecs;
481 
482         if (! runtime->rate)
483                 return -1; /* invalid */
484 
485         /* take 75% of period time as the deadline */
486         usecs = (750000 / runtime->rate) * runtime->period_size;
487         usecs += ((750000 % runtime->rate) * runtime->period_size) /
488                 runtime->rate;
489 
490         return usecs;
491 }
492 
493 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
494 {
495         snd_pcm_stream_lock_irq(substream);
496         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
497                 substream->runtime->status->state = state;
498         snd_pcm_stream_unlock_irq(substream);
499 }
500 
501 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
502                                         int event)
503 {
504 #ifdef CONFIG_SND_PCM_TIMER
505         if (substream->timer)
506                 snd_timer_notify(substream->timer, event,
507                                         &substream->runtime->trigger_tstamp);
508 #endif
509 }
510 
511 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
512                              struct snd_pcm_hw_params *params)
513 {
514         struct snd_pcm_runtime *runtime;
515         int err, usecs;
516         unsigned int bits;
517         snd_pcm_uframes_t frames;
518 
519         if (PCM_RUNTIME_CHECK(substream))
520                 return -ENXIO;
521         runtime = substream->runtime;
522         snd_pcm_stream_lock_irq(substream);
523         switch (runtime->status->state) {
524         case SNDRV_PCM_STATE_OPEN:
525         case SNDRV_PCM_STATE_SETUP:
526         case SNDRV_PCM_STATE_PREPARED:
527                 break;
528         default:
529                 snd_pcm_stream_unlock_irq(substream);
530                 return -EBADFD;
531         }
532         snd_pcm_stream_unlock_irq(substream);
533 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
534         if (!substream->oss.oss)
535 #endif
536                 if (atomic_read(&substream->mmap_count))
537                         return -EBADFD;
538 
539         params->rmask = ~0U;
540         err = snd_pcm_hw_refine(substream, params);
541         if (err < 0)
542                 goto _error;
543 
544         err = snd_pcm_hw_params_choose(substream, params);
545         if (err < 0)
546                 goto _error;
547 
548         if (substream->ops->hw_params != NULL) {
549                 err = substream->ops->hw_params(substream, params);
550                 if (err < 0)
551                         goto _error;
552         }
553 
554         runtime->access = params_access(params);
555         runtime->format = params_format(params);
556         runtime->subformat = params_subformat(params);
557         runtime->channels = params_channels(params);
558         runtime->rate = params_rate(params);
559         runtime->period_size = params_period_size(params);
560         runtime->periods = params_periods(params);
561         runtime->buffer_size = params_buffer_size(params);
562         runtime->info = params->info;
563         runtime->rate_num = params->rate_num;
564         runtime->rate_den = params->rate_den;
565         runtime->no_period_wakeup =
566                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
567                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
568 
569         bits = snd_pcm_format_physical_width(runtime->format);
570         runtime->sample_bits = bits;
571         bits *= runtime->channels;
572         runtime->frame_bits = bits;
573         frames = 1;
574         while (bits % 8 != 0) {
575                 bits *= 2;
576                 frames *= 2;
577         }
578         runtime->byte_align = bits / 8;
579         runtime->min_align = frames;
580 
581         /* Default sw params */
582         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
583         runtime->period_step = 1;
584         runtime->control->avail_min = runtime->period_size;
585         runtime->start_threshold = 1;
586         runtime->stop_threshold = runtime->buffer_size;
587         runtime->silence_threshold = 0;
588         runtime->silence_size = 0;
589         runtime->boundary = runtime->buffer_size;
590         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
591                 runtime->boundary *= 2;
592 
593         snd_pcm_timer_resolution_change(substream);
594         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
595 
596         if (pm_qos_request_active(&substream->latency_pm_qos_req))
597                 pm_qos_remove_request(&substream->latency_pm_qos_req);
598         if ((usecs = period_to_usecs(runtime)) >= 0)
599                 pm_qos_add_request(&substream->latency_pm_qos_req,
600                                    PM_QOS_CPU_DMA_LATENCY, usecs);
601         return 0;
602  _error:
603         /* hardware might be unusable from this time,
604            so we force application to retry to set
605            the correct hardware parameter settings */
606         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
607         if (substream->ops->hw_free != NULL)
608                 substream->ops->hw_free(substream);
609         return err;
610 }
611 
612 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
613                                   struct snd_pcm_hw_params __user * _params)
614 {
615         struct snd_pcm_hw_params *params;
616         int err;
617 
618         params = memdup_user(_params, sizeof(*params));
619         if (IS_ERR(params))
620                 return PTR_ERR(params);
621 
622         err = snd_pcm_hw_params(substream, params);
623         if (copy_to_user(_params, params, sizeof(*params))) {
624                 if (!err)
625                         err = -EFAULT;
626         }
627 
628         kfree(params);
629         return err;
630 }
631 
632 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
633 {
634         struct snd_pcm_runtime *runtime;
635         int result = 0;
636 
637         if (PCM_RUNTIME_CHECK(substream))
638                 return -ENXIO;
639         runtime = substream->runtime;
640         snd_pcm_stream_lock_irq(substream);
641         switch (runtime->status->state) {
642         case SNDRV_PCM_STATE_SETUP:
643         case SNDRV_PCM_STATE_PREPARED:
644                 break;
645         default:
646                 snd_pcm_stream_unlock_irq(substream);
647                 return -EBADFD;
648         }
649         snd_pcm_stream_unlock_irq(substream);
650         if (atomic_read(&substream->mmap_count))
651                 return -EBADFD;
652         if (substream->ops->hw_free)
653                 result = substream->ops->hw_free(substream);
654         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
655         pm_qos_remove_request(&substream->latency_pm_qos_req);
656         return result;
657 }
658 
659 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
660                              struct snd_pcm_sw_params *params)
661 {
662         struct snd_pcm_runtime *runtime;
663         int err;
664 
665         if (PCM_RUNTIME_CHECK(substream))
666                 return -ENXIO;
667         runtime = substream->runtime;
668         snd_pcm_stream_lock_irq(substream);
669         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
670                 snd_pcm_stream_unlock_irq(substream);
671                 return -EBADFD;
672         }
673         snd_pcm_stream_unlock_irq(substream);
674 
675         if (params->tstamp_mode < 0 ||
676             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
677                 return -EINVAL;
678         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
679             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
680                 return -EINVAL;
681         if (params->avail_min == 0)
682                 return -EINVAL;
683         if (params->silence_size >= runtime->boundary) {
684                 if (params->silence_threshold != 0)
685                         return -EINVAL;
686         } else {
687                 if (params->silence_size > params->silence_threshold)
688                         return -EINVAL;
689                 if (params->silence_threshold > runtime->buffer_size)
690                         return -EINVAL;
691         }
692         err = 0;
693         snd_pcm_stream_lock_irq(substream);
694         runtime->tstamp_mode = params->tstamp_mode;
695         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
696                 runtime->tstamp_type = params->tstamp_type;
697         runtime->period_step = params->period_step;
698         runtime->control->avail_min = params->avail_min;
699         runtime->start_threshold = params->start_threshold;
700         runtime->stop_threshold = params->stop_threshold;
701         runtime->silence_threshold = params->silence_threshold;
702         runtime->silence_size = params->silence_size;
703         params->boundary = runtime->boundary;
704         if (snd_pcm_running(substream)) {
705                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
706                     runtime->silence_size > 0)
707                         snd_pcm_playback_silence(substream, ULONG_MAX);
708                 err = snd_pcm_update_state(substream, runtime);
709         }
710         snd_pcm_stream_unlock_irq(substream);
711         return err;
712 }
713 
714 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
715                                   struct snd_pcm_sw_params __user * _params)
716 {
717         struct snd_pcm_sw_params params;
718         int err;
719         if (copy_from_user(&params, _params, sizeof(params)))
720                 return -EFAULT;
721         err = snd_pcm_sw_params(substream, &params);
722         if (copy_to_user(_params, &params, sizeof(params)))
723                 return -EFAULT;
724         return err;
725 }
726 
727 int snd_pcm_status(struct snd_pcm_substream *substream,
728                    struct snd_pcm_status *status)
729 {
730         struct snd_pcm_runtime *runtime = substream->runtime;
731 
732         snd_pcm_stream_lock_irq(substream);
733 
734         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
735                                         &runtime->audio_tstamp_config);
736 
737         /* backwards compatible behavior */
738         if (runtime->audio_tstamp_config.type_requested ==
739                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
740                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
741                         runtime->audio_tstamp_config.type_requested =
742                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
743                 else
744                         runtime->audio_tstamp_config.type_requested =
745                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
746                 runtime->audio_tstamp_report.valid = 0;
747         } else
748                 runtime->audio_tstamp_report.valid = 1;
749 
750         status->state = runtime->status->state;
751         status->suspended_state = runtime->status->suspended_state;
752         if (status->state == SNDRV_PCM_STATE_OPEN)
753                 goto _end;
754         status->trigger_tstamp = runtime->trigger_tstamp;
755         if (snd_pcm_running(substream)) {
756                 snd_pcm_update_hw_ptr(substream);
757                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
758                         status->tstamp = runtime->status->tstamp;
759                         status->driver_tstamp = runtime->driver_tstamp;
760                         status->audio_tstamp =
761                                 runtime->status->audio_tstamp;
762                         if (runtime->audio_tstamp_report.valid == 1)
763                                 /* backwards compatibility, no report provided in COMPAT mode */
764                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
765                                                                 &status->audio_tstamp_accuracy,
766                                                                 &runtime->audio_tstamp_report);
767 
768                         goto _tstamp_end;
769                 }
770         } else {
771                 /* get tstamp only in fallback mode and only if enabled */
772                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
773                         snd_pcm_gettime(runtime, &status->tstamp);
774         }
775  _tstamp_end:
776         status->appl_ptr = runtime->control->appl_ptr;
777         status->hw_ptr = runtime->status->hw_ptr;
778         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
779                 status->avail = snd_pcm_playback_avail(runtime);
780                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
781                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
782                         status->delay = runtime->buffer_size - status->avail;
783                         status->delay += runtime->delay;
784                 } else
785                         status->delay = 0;
786         } else {
787                 status->avail = snd_pcm_capture_avail(runtime);
788                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
789                         status->delay = status->avail + runtime->delay;
790                 else
791                         status->delay = 0;
792         }
793         status->avail_max = runtime->avail_max;
794         status->overrange = runtime->overrange;
795         runtime->avail_max = 0;
796         runtime->overrange = 0;
797  _end:
798         snd_pcm_stream_unlock_irq(substream);
799         return 0;
800 }
801 
802 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
803                                struct snd_pcm_status __user * _status,
804                                bool ext)
805 {
806         struct snd_pcm_status status;
807         int res;
808 
809         memset(&status, 0, sizeof(status));
810         /*
811          * with extension, parameters are read/write,
812          * get audio_tstamp_data from user,
813          * ignore rest of status structure
814          */
815         if (ext && get_user(status.audio_tstamp_data,
816                                 (u32 __user *)(&_status->audio_tstamp_data)))
817                 return -EFAULT;
818         res = snd_pcm_status(substream, &status);
819         if (res < 0)
820                 return res;
821         if (copy_to_user(_status, &status, sizeof(status)))
822                 return -EFAULT;
823         return 0;
824 }
825 
826 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
827                                 struct snd_pcm_channel_info * info)
828 {
829         struct snd_pcm_runtime *runtime;
830         unsigned int channel;
831         
832         channel = info->channel;
833         runtime = substream->runtime;
834         snd_pcm_stream_lock_irq(substream);
835         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
836                 snd_pcm_stream_unlock_irq(substream);
837                 return -EBADFD;
838         }
839         snd_pcm_stream_unlock_irq(substream);
840         if (channel >= runtime->channels)
841                 return -EINVAL;
842         memset(info, 0, sizeof(*info));
843         info->channel = channel;
844         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
845 }
846 
847 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
848                                      struct snd_pcm_channel_info __user * _info)
849 {
850         struct snd_pcm_channel_info info;
851         int res;
852         
853         if (copy_from_user(&info, _info, sizeof(info)))
854                 return -EFAULT;
855         res = snd_pcm_channel_info(substream, &info);
856         if (res < 0)
857                 return res;
858         if (copy_to_user(_info, &info, sizeof(info)))
859                 return -EFAULT;
860         return 0;
861 }
862 
863 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
864 {
865         struct snd_pcm_runtime *runtime = substream->runtime;
866         if (runtime->trigger_master == NULL)
867                 return;
868         if (runtime->trigger_master == substream) {
869                 if (!runtime->trigger_tstamp_latched)
870                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
871         } else {
872                 snd_pcm_trigger_tstamp(runtime->trigger_master);
873                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
874         }
875         runtime->trigger_master = NULL;
876 }
877 
878 struct action_ops {
879         int (*pre_action)(struct snd_pcm_substream *substream, int state);
880         int (*do_action)(struct snd_pcm_substream *substream, int state);
881         void (*undo_action)(struct snd_pcm_substream *substream, int state);
882         void (*post_action)(struct snd_pcm_substream *substream, int state);
883 };
884 
885 /*
886  *  this functions is core for handling of linked stream
887  *  Note: the stream state might be changed also on failure
888  *  Note2: call with calling stream lock + link lock
889  */
890 static int snd_pcm_action_group(const struct action_ops *ops,
891                                 struct snd_pcm_substream *substream,
892                                 int state, int do_lock)
893 {
894         struct snd_pcm_substream *s = NULL;
895         struct snd_pcm_substream *s1;
896         int res = 0, depth = 1;
897 
898         snd_pcm_group_for_each_entry(s, substream) {
899                 if (do_lock && s != substream) {
900                         if (s->pcm->nonatomic)
901                                 mutex_lock_nested(&s->self_group.mutex, depth);
902                         else
903                                 spin_lock_nested(&s->self_group.lock, depth);
904                         depth++;
905                 }
906                 res = ops->pre_action(s, state);
907                 if (res < 0)
908                         goto _unlock;
909         }
910         snd_pcm_group_for_each_entry(s, substream) {
911                 res = ops->do_action(s, state);
912                 if (res < 0) {
913                         if (ops->undo_action) {
914                                 snd_pcm_group_for_each_entry(s1, substream) {
915                                         if (s1 == s) /* failed stream */
916                                                 break;
917                                         ops->undo_action(s1, state);
918                                 }
919                         }
920                         s = NULL; /* unlock all */
921                         goto _unlock;
922                 }
923         }
924         snd_pcm_group_for_each_entry(s, substream) {
925                 ops->post_action(s, state);
926         }
927  _unlock:
928         if (do_lock) {
929                 /* unlock streams */
930                 snd_pcm_group_for_each_entry(s1, substream) {
931                         if (s1 != substream) {
932                                 if (s1->pcm->nonatomic)
933                                         mutex_unlock(&s1->self_group.mutex);
934                                 else
935                                         spin_unlock(&s1->self_group.lock);
936                         }
937                         if (s1 == s)    /* end */
938                                 break;
939                 }
940         }
941         return res;
942 }
943 
944 /*
945  *  Note: call with stream lock
946  */
947 static int snd_pcm_action_single(const struct action_ops *ops,
948                                  struct snd_pcm_substream *substream,
949                                  int state)
950 {
951         int res;
952         
953         res = ops->pre_action(substream, state);
954         if (res < 0)
955                 return res;
956         res = ops->do_action(substream, state);
957         if (res == 0)
958                 ops->post_action(substream, state);
959         else if (ops->undo_action)
960                 ops->undo_action(substream, state);
961         return res;
962 }
963 
964 /*
965  *  Note: call with stream lock
966  */
967 static int snd_pcm_action(const struct action_ops *ops,
968                           struct snd_pcm_substream *substream,
969                           int state)
970 {
971         int res;
972 
973         if (!snd_pcm_stream_linked(substream))
974                 return snd_pcm_action_single(ops, substream, state);
975 
976         if (substream->pcm->nonatomic) {
977                 if (!mutex_trylock(&substream->group->mutex)) {
978                         mutex_unlock(&substream->self_group.mutex);
979                         mutex_lock(&substream->group->mutex);
980                         mutex_lock(&substream->self_group.mutex);
981                 }
982                 res = snd_pcm_action_group(ops, substream, state, 1);
983                 mutex_unlock(&substream->group->mutex);
984         } else {
985                 if (!spin_trylock(&substream->group->lock)) {
986                         spin_unlock(&substream->self_group.lock);
987                         spin_lock(&substream->group->lock);
988                         spin_lock(&substream->self_group.lock);
989                 }
990                 res = snd_pcm_action_group(ops, substream, state, 1);
991                 spin_unlock(&substream->group->lock);
992         }
993         return res;
994 }
995 
996 /*
997  *  Note: don't use any locks before
998  */
999 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1000                                    struct snd_pcm_substream *substream,
1001                                    int state)
1002 {
1003         int res;
1004 
1005         snd_pcm_stream_lock_irq(substream);
1006         res = snd_pcm_action(ops, substream, state);
1007         snd_pcm_stream_unlock_irq(substream);
1008         return res;
1009 }
1010 
1011 /*
1012  */
1013 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1014                                     struct snd_pcm_substream *substream,
1015                                     int state)
1016 {
1017         int res;
1018 
1019         down_read(&snd_pcm_link_rwsem);
1020         if (snd_pcm_stream_linked(substream))
1021                 res = snd_pcm_action_group(ops, substream, state, 0);
1022         else
1023                 res = snd_pcm_action_single(ops, substream, state);
1024         up_read(&snd_pcm_link_rwsem);
1025         return res;
1026 }
1027 
1028 /*
1029  * start callbacks
1030  */
1031 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1032 {
1033         struct snd_pcm_runtime *runtime = substream->runtime;
1034         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1035                 return -EBADFD;
1036         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1037             !snd_pcm_playback_data(substream))
1038                 return -EPIPE;
1039         runtime->trigger_tstamp_latched = false;
1040         runtime->trigger_master = substream;
1041         return 0;
1042 }
1043 
1044 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1045 {
1046         if (substream->runtime->trigger_master != substream)
1047                 return 0;
1048         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1049 }
1050 
1051 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1052 {
1053         if (substream->runtime->trigger_master == substream)
1054                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1055 }
1056 
1057 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1058 {
1059         struct snd_pcm_runtime *runtime = substream->runtime;
1060         snd_pcm_trigger_tstamp(substream);
1061         runtime->hw_ptr_jiffies = jiffies;
1062         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
1063                                                             runtime->rate;
1064         runtime->status->state = state;
1065         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1066             runtime->silence_size > 0)
1067                 snd_pcm_playback_silence(substream, ULONG_MAX);
1068         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1069 }
1070 
1071 static const struct action_ops snd_pcm_action_start = {
1072         .pre_action = snd_pcm_pre_start,
1073         .do_action = snd_pcm_do_start,
1074         .undo_action = snd_pcm_undo_start,
1075         .post_action = snd_pcm_post_start
1076 };
1077 
1078 /**
1079  * snd_pcm_start - start all linked streams
1080  * @substream: the PCM substream instance
1081  *
1082  * Return: Zero if successful, or a negative error code.
1083  */
1084 int snd_pcm_start(struct snd_pcm_substream *substream)
1085 {
1086         return snd_pcm_action(&snd_pcm_action_start, substream,
1087                               SNDRV_PCM_STATE_RUNNING);
1088 }
1089 
1090 /*
1091  * stop callbacks
1092  */
1093 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1094 {
1095         struct snd_pcm_runtime *runtime = substream->runtime;
1096         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1097                 return -EBADFD;
1098         runtime->trigger_master = substream;
1099         return 0;
1100 }
1101 
1102 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1103 {
1104         if (substream->runtime->trigger_master == substream &&
1105             snd_pcm_running(substream))
1106                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1107         return 0; /* unconditonally stop all substreams */
1108 }
1109 
1110 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1111 {
1112         struct snd_pcm_runtime *runtime = substream->runtime;
1113         if (runtime->status->state != state) {
1114                 snd_pcm_trigger_tstamp(substream);
1115                 runtime->status->state = state;
1116                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1117         }
1118         wake_up(&runtime->sleep);
1119         wake_up(&runtime->tsleep);
1120 }
1121 
1122 static const struct action_ops snd_pcm_action_stop = {
1123         .pre_action = snd_pcm_pre_stop,
1124         .do_action = snd_pcm_do_stop,
1125         .post_action = snd_pcm_post_stop
1126 };
1127 
1128 /**
1129  * snd_pcm_stop - try to stop all running streams in the substream group
1130  * @substream: the PCM substream instance
1131  * @state: PCM state after stopping the stream
1132  *
1133  * The state of each stream is then changed to the given state unconditionally.
1134  *
1135  * Return: Zero if successful, or a negative error code.
1136  */
1137 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1138 {
1139         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1140 }
1141 
1142 EXPORT_SYMBOL(snd_pcm_stop);
1143 
1144 /**
1145  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1146  * @substream: the PCM substream
1147  *
1148  * After stopping, the state is changed to SETUP.
1149  * Unlike snd_pcm_stop(), this affects only the given stream.
1150  *
1151  * Return: Zero if succesful, or a negative error code.
1152  */
1153 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1154 {
1155         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1156                                      SNDRV_PCM_STATE_SETUP);
1157 }
1158 
1159 /**
1160  * snd_pcm_stop_xrun - stop the running streams as XRUN
1161  * @substream: the PCM substream instance
1162  *
1163  * This stops the given running substream (and all linked substreams) as XRUN.
1164  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1165  *
1166  * Return: Zero if successful, or a negative error code.
1167  */
1168 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1169 {
1170         unsigned long flags;
1171         int ret = 0;
1172 
1173         snd_pcm_stream_lock_irqsave(substream, flags);
1174         if (snd_pcm_running(substream))
1175                 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1176         snd_pcm_stream_unlock_irqrestore(substream, flags);
1177         return ret;
1178 }
1179 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1180 
1181 /*
1182  * pause callbacks
1183  */
1184 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1185 {
1186         struct snd_pcm_runtime *runtime = substream->runtime;
1187         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1188                 return -ENOSYS;
1189         if (push) {
1190                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1191                         return -EBADFD;
1192         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1193                 return -EBADFD;
1194         runtime->trigger_master = substream;
1195         return 0;
1196 }
1197 
1198 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1199 {
1200         if (substream->runtime->trigger_master != substream)
1201                 return 0;
1202         /* some drivers might use hw_ptr to recover from the pause -
1203            update the hw_ptr now */
1204         if (push)
1205                 snd_pcm_update_hw_ptr(substream);
1206         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1207          * a delta between the current jiffies, this gives a large enough
1208          * delta, effectively to skip the check once.
1209          */
1210         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1211         return substream->ops->trigger(substream,
1212                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1213                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1214 }
1215 
1216 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1217 {
1218         if (substream->runtime->trigger_master == substream)
1219                 substream->ops->trigger(substream,
1220                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1221                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1222 }
1223 
1224 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1225 {
1226         struct snd_pcm_runtime *runtime = substream->runtime;
1227         snd_pcm_trigger_tstamp(substream);
1228         if (push) {
1229                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1230                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1231                 wake_up(&runtime->sleep);
1232                 wake_up(&runtime->tsleep);
1233         } else {
1234                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1235                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1236         }
1237 }
1238 
1239 static const struct action_ops snd_pcm_action_pause = {
1240         .pre_action = snd_pcm_pre_pause,
1241         .do_action = snd_pcm_do_pause,
1242         .undo_action = snd_pcm_undo_pause,
1243         .post_action = snd_pcm_post_pause
1244 };
1245 
1246 /*
1247  * Push/release the pause for all linked streams.
1248  */
1249 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1250 {
1251         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1252 }
1253 
1254 #ifdef CONFIG_PM
1255 /* suspend */
1256 
1257 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1258 {
1259         struct snd_pcm_runtime *runtime = substream->runtime;
1260         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1261                 return -EBUSY;
1262         runtime->trigger_master = substream;
1263         return 0;
1264 }
1265 
1266 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1267 {
1268         struct snd_pcm_runtime *runtime = substream->runtime;
1269         if (runtime->trigger_master != substream)
1270                 return 0;
1271         if (! snd_pcm_running(substream))
1272                 return 0;
1273         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1274         return 0; /* suspend unconditionally */
1275 }
1276 
1277 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1278 {
1279         struct snd_pcm_runtime *runtime = substream->runtime;
1280         snd_pcm_trigger_tstamp(substream);
1281         runtime->status->suspended_state = runtime->status->state;
1282         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1283         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1284         wake_up(&runtime->sleep);
1285         wake_up(&runtime->tsleep);
1286 }
1287 
1288 static const struct action_ops snd_pcm_action_suspend = {
1289         .pre_action = snd_pcm_pre_suspend,
1290         .do_action = snd_pcm_do_suspend,
1291         .post_action = snd_pcm_post_suspend
1292 };
1293 
1294 /**
1295  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1296  * @substream: the PCM substream
1297  *
1298  * After this call, all streams are changed to SUSPENDED state.
1299  *
1300  * Return: Zero if successful (or @substream is %NULL), or a negative error
1301  * code.
1302  */
1303 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1304 {
1305         int err;
1306         unsigned long flags;
1307 
1308         if (! substream)
1309                 return 0;
1310 
1311         snd_pcm_stream_lock_irqsave(substream, flags);
1312         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1313         snd_pcm_stream_unlock_irqrestore(substream, flags);
1314         return err;
1315 }
1316 
1317 EXPORT_SYMBOL(snd_pcm_suspend);
1318 
1319 /**
1320  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1321  * @pcm: the PCM instance
1322  *
1323  * After this call, all streams are changed to SUSPENDED state.
1324  *
1325  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1326  */
1327 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1328 {
1329         struct snd_pcm_substream *substream;
1330         int stream, err = 0;
1331 
1332         if (! pcm)
1333                 return 0;
1334 
1335         for (stream = 0; stream < 2; stream++) {
1336                 for (substream = pcm->streams[stream].substream;
1337                      substream; substream = substream->next) {
1338                         /* FIXME: the open/close code should lock this as well */
1339                         if (substream->runtime == NULL)
1340                                 continue;
1341                         err = snd_pcm_suspend(substream);
1342                         if (err < 0 && err != -EBUSY)
1343                                 return err;
1344                 }
1345         }
1346         return 0;
1347 }
1348 
1349 EXPORT_SYMBOL(snd_pcm_suspend_all);
1350 
1351 /* resume */
1352 
1353 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1354 {
1355         struct snd_pcm_runtime *runtime = substream->runtime;
1356         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1357                 return -ENOSYS;
1358         runtime->trigger_master = substream;
1359         return 0;
1360 }
1361 
1362 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1363 {
1364         struct snd_pcm_runtime *runtime = substream->runtime;
1365         if (runtime->trigger_master != substream)
1366                 return 0;
1367         /* DMA not running previously? */
1368         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1369             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1370              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1371                 return 0;
1372         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1373 }
1374 
1375 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1376 {
1377         if (substream->runtime->trigger_master == substream &&
1378             snd_pcm_running(substream))
1379                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1380 }
1381 
1382 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1383 {
1384         struct snd_pcm_runtime *runtime = substream->runtime;
1385         snd_pcm_trigger_tstamp(substream);
1386         runtime->status->state = runtime->status->suspended_state;
1387         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1388 }
1389 
1390 static const struct action_ops snd_pcm_action_resume = {
1391         .pre_action = snd_pcm_pre_resume,
1392         .do_action = snd_pcm_do_resume,
1393         .undo_action = snd_pcm_undo_resume,
1394         .post_action = snd_pcm_post_resume
1395 };
1396 
1397 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1398 {
1399         struct snd_card *card = substream->pcm->card;
1400         int res;
1401 
1402         snd_power_lock(card);
1403         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1404                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1405         snd_power_unlock(card);
1406         return res;
1407 }
1408 
1409 #else
1410 
1411 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1412 {
1413         return -ENOSYS;
1414 }
1415 
1416 #endif /* CONFIG_PM */
1417 
1418 /*
1419  * xrun ioctl
1420  *
1421  * Change the RUNNING stream(s) to XRUN state.
1422  */
1423 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1424 {
1425         struct snd_card *card = substream->pcm->card;
1426         struct snd_pcm_runtime *runtime = substream->runtime;
1427         int result;
1428 
1429         snd_power_lock(card);
1430         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432                 if (result < 0)
1433                         goto _unlock;
1434         }
1435 
1436         snd_pcm_stream_lock_irq(substream);
1437         switch (runtime->status->state) {
1438         case SNDRV_PCM_STATE_XRUN:
1439                 result = 0;     /* already there */
1440                 break;
1441         case SNDRV_PCM_STATE_RUNNING:
1442                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1443                 break;
1444         default:
1445                 result = -EBADFD;
1446         }
1447         snd_pcm_stream_unlock_irq(substream);
1448  _unlock:
1449         snd_power_unlock(card);
1450         return result;
1451 }
1452 
1453 /*
1454  * reset ioctl
1455  */
1456 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1457 {
1458         struct snd_pcm_runtime *runtime = substream->runtime;
1459         switch (runtime->status->state) {
1460         case SNDRV_PCM_STATE_RUNNING:
1461         case SNDRV_PCM_STATE_PREPARED:
1462         case SNDRV_PCM_STATE_PAUSED:
1463         case SNDRV_PCM_STATE_SUSPENDED:
1464                 return 0;
1465         default:
1466                 return -EBADFD;
1467         }
1468 }
1469 
1470 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1471 {
1472         struct snd_pcm_runtime *runtime = substream->runtime;
1473         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1474         if (err < 0)
1475                 return err;
1476         runtime->hw_ptr_base = 0;
1477         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1478                 runtime->status->hw_ptr % runtime->period_size;
1479         runtime->silence_start = runtime->status->hw_ptr;
1480         runtime->silence_filled = 0;
1481         return 0;
1482 }
1483 
1484 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1485 {
1486         struct snd_pcm_runtime *runtime = substream->runtime;
1487         runtime->control->appl_ptr = runtime->status->hw_ptr;
1488         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1489             runtime->silence_size > 0)
1490                 snd_pcm_playback_silence(substream, ULONG_MAX);
1491 }
1492 
1493 static const struct action_ops snd_pcm_action_reset = {
1494         .pre_action = snd_pcm_pre_reset,
1495         .do_action = snd_pcm_do_reset,
1496         .post_action = snd_pcm_post_reset
1497 };
1498 
1499 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1500 {
1501         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1502 }
1503 
1504 /*
1505  * prepare ioctl
1506  */
1507 /* we use the second argument for updating f_flags */
1508 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1509                                int f_flags)
1510 {
1511         struct snd_pcm_runtime *runtime = substream->runtime;
1512         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1513             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1514                 return -EBADFD;
1515         if (snd_pcm_running(substream))
1516                 return -EBUSY;
1517         substream->f_flags = f_flags;
1518         return 0;
1519 }
1520 
1521 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1522 {
1523         int err;
1524         err = substream->ops->prepare(substream);
1525         if (err < 0)
1526                 return err;
1527         return snd_pcm_do_reset(substream, 0);
1528 }
1529 
1530 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1531 {
1532         struct snd_pcm_runtime *runtime = substream->runtime;
1533         runtime->control->appl_ptr = runtime->status->hw_ptr;
1534         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1535 }
1536 
1537 static const struct action_ops snd_pcm_action_prepare = {
1538         .pre_action = snd_pcm_pre_prepare,
1539         .do_action = snd_pcm_do_prepare,
1540         .post_action = snd_pcm_post_prepare
1541 };
1542 
1543 /**
1544  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1545  * @substream: the PCM substream instance
1546  * @file: file to refer f_flags
1547  *
1548  * Return: Zero if successful, or a negative error code.
1549  */
1550 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1551                            struct file *file)
1552 {
1553         int res;
1554         struct snd_card *card = substream->pcm->card;
1555         int f_flags;
1556 
1557         if (file)
1558                 f_flags = file->f_flags;
1559         else
1560                 f_flags = substream->f_flags;
1561 
1562         snd_power_lock(card);
1563         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1564                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1565                                                substream, f_flags);
1566         snd_power_unlock(card);
1567         return res;
1568 }
1569 
1570 /*
1571  * drain ioctl
1572  */
1573 
1574 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1575 {
1576         struct snd_pcm_runtime *runtime = substream->runtime;
1577         switch (runtime->status->state) {
1578         case SNDRV_PCM_STATE_OPEN:
1579         case SNDRV_PCM_STATE_DISCONNECTED:
1580         case SNDRV_PCM_STATE_SUSPENDED:
1581                 return -EBADFD;
1582         }
1583         runtime->trigger_master = substream;
1584         return 0;
1585 }
1586 
1587 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1588 {
1589         struct snd_pcm_runtime *runtime = substream->runtime;
1590         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1591                 switch (runtime->status->state) {
1592                 case SNDRV_PCM_STATE_PREPARED:
1593                         /* start playback stream if possible */
1594                         if (! snd_pcm_playback_empty(substream)) {
1595                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1596                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1597                         } else {
1598                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1599                         }
1600                         break;
1601                 case SNDRV_PCM_STATE_RUNNING:
1602                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1603                         break;
1604                 case SNDRV_PCM_STATE_XRUN:
1605                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1606                         break;
1607                 default:
1608                         break;
1609                 }
1610         } else {
1611                 /* stop running stream */
1612                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1613                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1614                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1615                         snd_pcm_do_stop(substream, new_state);
1616                         snd_pcm_post_stop(substream, new_state);
1617                 }
1618         }
1619 
1620         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1621             runtime->trigger_master == substream &&
1622             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1623                 return substream->ops->trigger(substream,
1624                                                SNDRV_PCM_TRIGGER_DRAIN);
1625 
1626         return 0;
1627 }
1628 
1629 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1630 {
1631 }
1632 
1633 static const struct action_ops snd_pcm_action_drain_init = {
1634         .pre_action = snd_pcm_pre_drain_init,
1635         .do_action = snd_pcm_do_drain_init,
1636         .post_action = snd_pcm_post_drain_init
1637 };
1638 
1639 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1640 
1641 /*
1642  * Drain the stream(s).
1643  * When the substream is linked, sync until the draining of all playback streams
1644  * is finished.
1645  * After this call, all streams are supposed to be either SETUP or DRAINING
1646  * (capture only) state.
1647  */
1648 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1649                          struct file *file)
1650 {
1651         struct snd_card *card;
1652         struct snd_pcm_runtime *runtime;
1653         struct snd_pcm_substream *s;
1654         wait_queue_t wait;
1655         int result = 0;
1656         int nonblock = 0;
1657 
1658         card = substream->pcm->card;
1659         runtime = substream->runtime;
1660 
1661         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1662                 return -EBADFD;
1663 
1664         snd_power_lock(card);
1665         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1666                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1667                 if (result < 0) {
1668                         snd_power_unlock(card);
1669                         return result;
1670                 }
1671         }
1672 
1673         if (file) {
1674                 if (file->f_flags & O_NONBLOCK)
1675                         nonblock = 1;
1676         } else if (substream->f_flags & O_NONBLOCK)
1677                 nonblock = 1;
1678 
1679         down_read(&snd_pcm_link_rwsem);
1680         snd_pcm_stream_lock_irq(substream);
1681         /* resume pause */
1682         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1683                 snd_pcm_pause(substream, 0);
1684 
1685         /* pre-start/stop - all running streams are changed to DRAINING state */
1686         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1687         if (result < 0)
1688                 goto unlock;
1689         /* in non-blocking, we don't wait in ioctl but let caller poll */
1690         if (nonblock) {
1691                 result = -EAGAIN;
1692                 goto unlock;
1693         }
1694 
1695         for (;;) {
1696                 long tout;
1697                 struct snd_pcm_runtime *to_check;
1698                 if (signal_pending(current)) {
1699                         result = -ERESTARTSYS;
1700                         break;
1701                 }
1702                 /* find a substream to drain */
1703                 to_check = NULL;
1704                 snd_pcm_group_for_each_entry(s, substream) {
1705                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1706                                 continue;
1707                         runtime = s->runtime;
1708                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1709                                 to_check = runtime;
1710                                 break;
1711                         }
1712                 }
1713                 if (!to_check)
1714                         break; /* all drained */
1715                 init_waitqueue_entry(&wait, current);
1716                 add_wait_queue(&to_check->sleep, &wait);
1717                 snd_pcm_stream_unlock_irq(substream);
1718                 up_read(&snd_pcm_link_rwsem);
1719                 snd_power_unlock(card);
1720                 if (runtime->no_period_wakeup)
1721                         tout = MAX_SCHEDULE_TIMEOUT;
1722                 else {
1723                         tout = 10;
1724                         if (runtime->rate) {
1725                                 long t = runtime->period_size * 2 / runtime->rate;
1726                                 tout = max(t, tout);
1727                         }
1728                         tout = msecs_to_jiffies(tout * 1000);
1729                 }
1730                 tout = schedule_timeout_interruptible(tout);
1731                 snd_power_lock(card);
1732                 down_read(&snd_pcm_link_rwsem);
1733                 snd_pcm_stream_lock_irq(substream);
1734                 remove_wait_queue(&to_check->sleep, &wait);
1735                 if (card->shutdown) {
1736                         result = -ENODEV;
1737                         break;
1738                 }
1739                 if (tout == 0) {
1740                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1741                                 result = -ESTRPIPE;
1742                         else {
1743                                 dev_dbg(substream->pcm->card->dev,
1744                                         "playback drain error (DMA or IRQ trouble?)\n");
1745                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1746                                 result = -EIO;
1747                         }
1748                         break;
1749                 }
1750         }
1751 
1752  unlock:
1753         snd_pcm_stream_unlock_irq(substream);
1754         up_read(&snd_pcm_link_rwsem);
1755         snd_power_unlock(card);
1756 
1757         return result;
1758 }
1759 
1760 /*
1761  * drop ioctl
1762  *
1763  * Immediately put all linked substreams into SETUP state.
1764  */
1765 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1766 {
1767         struct snd_pcm_runtime *runtime;
1768         int result = 0;
1769         
1770         if (PCM_RUNTIME_CHECK(substream))
1771                 return -ENXIO;
1772         runtime = substream->runtime;
1773 
1774         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1775             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1776             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1777                 return -EBADFD;
1778 
1779         snd_pcm_stream_lock_irq(substream);
1780         /* resume pause */
1781         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1782                 snd_pcm_pause(substream, 0);
1783 
1784         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1785         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1786         snd_pcm_stream_unlock_irq(substream);
1787 
1788         return result;
1789 }
1790 
1791 
1792 static bool is_pcm_file(struct file *file)
1793 {
1794         struct inode *inode = file_inode(file);
1795         unsigned int minor;
1796 
1797         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1798                 return false;
1799         minor = iminor(inode);
1800         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1801                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1802 }
1803 
1804 /*
1805  * PCM link handling
1806  */
1807 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1808 {
1809         int res = 0;
1810         struct snd_pcm_file *pcm_file;
1811         struct snd_pcm_substream *substream1;
1812         struct snd_pcm_group *group;
1813         struct fd f = fdget(fd);
1814 
1815         if (!f.file)
1816                 return -EBADFD;
1817         if (!is_pcm_file(f.file)) {
1818                 res = -EBADFD;
1819                 goto _badf;
1820         }
1821         pcm_file = f.file->private_data;
1822         substream1 = pcm_file->substream;
1823         group = kmalloc(sizeof(*group), GFP_KERNEL);
1824         if (!group) {
1825                 res = -ENOMEM;
1826                 goto _nolock;
1827         }
1828         down_write_nonblock(&snd_pcm_link_rwsem);
1829         write_lock_irq(&snd_pcm_link_rwlock);
1830         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1831             substream->runtime->status->state != substream1->runtime->status->state ||
1832             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1833                 res = -EBADFD;
1834                 goto _end;
1835         }
1836         if (snd_pcm_stream_linked(substream1)) {
1837                 res = -EALREADY;
1838                 goto _end;
1839         }
1840         if (!snd_pcm_stream_linked(substream)) {
1841                 substream->group = group;
1842                 group = NULL;
1843                 spin_lock_init(&substream->group->lock);
1844                 mutex_init(&substream->group->mutex);
1845                 INIT_LIST_HEAD(&substream->group->substreams);
1846                 list_add_tail(&substream->link_list, &substream->group->substreams);
1847                 substream->group->count = 1;
1848         }
1849         list_add_tail(&substream1->link_list, &substream->group->substreams);
1850         substream->group->count++;
1851         substream1->group = substream->group;
1852  _end:
1853         write_unlock_irq(&snd_pcm_link_rwlock);
1854         up_write(&snd_pcm_link_rwsem);
1855  _nolock:
1856         snd_card_unref(substream1->pcm->card);
1857         kfree(group);
1858  _badf:
1859         fdput(f);
1860         return res;
1861 }
1862 
1863 static void relink_to_local(struct snd_pcm_substream *substream)
1864 {
1865         substream->group = &substream->self_group;
1866         INIT_LIST_HEAD(&substream->self_group.substreams);
1867         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1868 }
1869 
1870 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1871 {
1872         struct snd_pcm_substream *s;
1873         int res = 0;
1874 
1875         down_write_nonblock(&snd_pcm_link_rwsem);
1876         write_lock_irq(&snd_pcm_link_rwlock);
1877         if (!snd_pcm_stream_linked(substream)) {
1878                 res = -EALREADY;
1879                 goto _end;
1880         }
1881         list_del(&substream->link_list);
1882         substream->group->count--;
1883         if (substream->group->count == 1) {     /* detach the last stream, too */
1884                 snd_pcm_group_for_each_entry(s, substream) {
1885                         relink_to_local(s);
1886                         break;
1887                 }
1888                 kfree(substream->group);
1889         }
1890         relink_to_local(substream);
1891        _end:
1892         write_unlock_irq(&snd_pcm_link_rwlock);
1893         up_write(&snd_pcm_link_rwsem);
1894         return res;
1895 }
1896 
1897 /*
1898  * hw configurator
1899  */
1900 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1901                                struct snd_pcm_hw_rule *rule)
1902 {
1903         struct snd_interval t;
1904         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1905                      hw_param_interval_c(params, rule->deps[1]), &t);
1906         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1907 }
1908 
1909 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1910                                struct snd_pcm_hw_rule *rule)
1911 {
1912         struct snd_interval t;
1913         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1914                      hw_param_interval_c(params, rule->deps[1]), &t);
1915         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1916 }
1917 
1918 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1919                                    struct snd_pcm_hw_rule *rule)
1920 {
1921         struct snd_interval t;
1922         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1923                          hw_param_interval_c(params, rule->deps[1]),
1924                          (unsigned long) rule->private, &t);
1925         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1926 }
1927 
1928 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1929                                    struct snd_pcm_hw_rule *rule)
1930 {
1931         struct snd_interval t;
1932         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1933                          (unsigned long) rule->private,
1934                          hw_param_interval_c(params, rule->deps[1]), &t);
1935         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1936 }
1937 
1938 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1939                                   struct snd_pcm_hw_rule *rule)
1940 {
1941         unsigned int k;
1942         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1943         struct snd_mask m;
1944         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1945         snd_mask_any(&m);
1946         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1947                 int bits;
1948                 if (! snd_mask_test(mask, k))
1949                         continue;
1950                 bits = snd_pcm_format_physical_width(k);
1951                 if (bits <= 0)
1952                         continue; /* ignore invalid formats */
1953                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1954                         snd_mask_reset(&m, k);
1955         }
1956         return snd_mask_refine(mask, &m);
1957 }
1958 
1959 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1960                                        struct snd_pcm_hw_rule *rule)
1961 {
1962         struct snd_interval t;
1963         unsigned int k;
1964         t.min = UINT_MAX;
1965         t.max = 0;
1966         t.openmin = 0;
1967         t.openmax = 0;
1968         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1969                 int bits;
1970                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1971                         continue;
1972                 bits = snd_pcm_format_physical_width(k);
1973                 if (bits <= 0)
1974                         continue; /* ignore invalid formats */
1975                 if (t.min > (unsigned)bits)
1976                         t.min = bits;
1977                 if (t.max < (unsigned)bits)
1978                         t.max = bits;
1979         }
1980         t.integer = 1;
1981         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1982 }
1983 
1984 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1985 #error "Change this table"
1986 #endif
1987 
1988 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1989                                  48000, 64000, 88200, 96000, 176400, 192000 };
1990 
1991 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1992         .count = ARRAY_SIZE(rates),
1993         .list = rates,
1994 };
1995 
1996 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1997                                 struct snd_pcm_hw_rule *rule)
1998 {
1999         struct snd_pcm_hardware *hw = rule->private;
2000         return snd_interval_list(hw_param_interval(params, rule->var),
2001                                  snd_pcm_known_rates.count,
2002                                  snd_pcm_known_rates.list, hw->rates);
2003 }               
2004 
2005 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2006                                             struct snd_pcm_hw_rule *rule)
2007 {
2008         struct snd_interval t;
2009         struct snd_pcm_substream *substream = rule->private;
2010         t.min = 0;
2011         t.max = substream->buffer_bytes_max;
2012         t.openmin = 0;
2013         t.openmax = 0;
2014         t.integer = 1;
2015         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2016 }               
2017 
2018 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2019 {
2020         struct snd_pcm_runtime *runtime = substream->runtime;
2021         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2022         int k, err;
2023 
2024         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2025                 snd_mask_any(constrs_mask(constrs, k));
2026         }
2027 
2028         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2029                 snd_interval_any(constrs_interval(constrs, k));
2030         }
2031 
2032         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2033         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2034         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2035         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2036         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2037 
2038         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2039                                    snd_pcm_hw_rule_format, NULL,
2040                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2041         if (err < 0)
2042                 return err;
2043         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2044                                   snd_pcm_hw_rule_sample_bits, NULL,
2045                                   SNDRV_PCM_HW_PARAM_FORMAT, 
2046                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2047         if (err < 0)
2048                 return err;
2049         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2050                                   snd_pcm_hw_rule_div, NULL,
2051                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2052         if (err < 0)
2053                 return err;
2054         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2055                                   snd_pcm_hw_rule_mul, NULL,
2056                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2057         if (err < 0)
2058                 return err;
2059         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2060                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2061                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2062         if (err < 0)
2063                 return err;
2064         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2065                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2066                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2067         if (err < 0)
2068                 return err;
2069         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
2070                                   snd_pcm_hw_rule_div, NULL,
2071                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2072         if (err < 0)
2073                 return err;
2074         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2075                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2076                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2077         if (err < 0)
2078                 return err;
2079         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2080                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2081                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2082         if (err < 0)
2083                 return err;
2084         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
2085                                   snd_pcm_hw_rule_div, NULL,
2086                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2087         if (err < 0)
2088                 return err;
2089         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2090                                   snd_pcm_hw_rule_div, NULL,
2091                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2092         if (err < 0)
2093                 return err;
2094         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2095                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2096                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2097         if (err < 0)
2098                 return err;
2099         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2100                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2101                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2102         if (err < 0)
2103                 return err;
2104         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2105                                   snd_pcm_hw_rule_mul, NULL,
2106                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2107         if (err < 0)
2108                 return err;
2109         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2110                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2111                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2112         if (err < 0)
2113                 return err;
2114         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2115                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2116                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2117         if (err < 0)
2118                 return err;
2119         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
2120                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2121                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2122         if (err < 0)
2123                 return err;
2124         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2125                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2126                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2127         if (err < 0)
2128                 return err;
2129         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
2130                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2131                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2132         if (err < 0)
2133                 return err;
2134         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
2135                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2136                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2137         if (err < 0)
2138                 return err;
2139         return 0;
2140 }
2141 
2142 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2143 {
2144         struct snd_pcm_runtime *runtime = substream->runtime;
2145         struct snd_pcm_hardware *hw = &runtime->hw;
2146         int err;
2147         unsigned int mask = 0;
2148 
2149         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2150                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2151         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2152                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2153         if (hw_support_mmap(substream)) {
2154                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2155                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2156                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2157                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2158                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2159                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2160         }
2161         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2162         if (err < 0)
2163                 return err;
2164 
2165         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2166         if (err < 0)
2167                 return err;
2168 
2169         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2170         if (err < 0)
2171                 return err;
2172 
2173         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2174                                            hw->channels_min, hw->channels_max);
2175         if (err < 0)
2176                 return err;
2177 
2178         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2179                                            hw->rate_min, hw->rate_max);
2180         if (err < 0)
2181                 return err;
2182 
2183         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2184                                            hw->period_bytes_min, hw->period_bytes_max);
2185         if (err < 0)
2186                 return err;
2187 
2188         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2189                                            hw->periods_min, hw->periods_max);
2190         if (err < 0)
2191                 return err;
2192 
2193         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2194                                            hw->period_bytes_min, hw->buffer_bytes_max);
2195         if (err < 0)
2196                 return err;
2197 
2198         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2199                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2200                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2201         if (err < 0)
2202                 return err;
2203 
2204         /* FIXME: remove */
2205         if (runtime->dma_bytes) {
2206                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2207                 if (err < 0)
2208                         return err;
2209         }
2210 
2211         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2212                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2213                                           snd_pcm_hw_rule_rate, hw,
2214                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2215                 if (err < 0)
2216                         return err;
2217         }
2218 
2219         /* FIXME: this belong to lowlevel */
2220         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2221 
2222         return 0;
2223 }
2224 
2225 static void pcm_release_private(struct snd_pcm_substream *substream)
2226 {
2227         snd_pcm_unlink(substream);
2228 }
2229 
2230 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2231 {
2232         substream->ref_count--;
2233         if (substream->ref_count > 0)
2234                 return;
2235 
2236         snd_pcm_drop(substream);
2237         if (substream->hw_opened) {
2238                 if (substream->ops->hw_free &&
2239                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2240                         substream->ops->hw_free(substream);
2241                 substream->ops->close(substream);
2242                 substream->hw_opened = 0;
2243         }
2244         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2245                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2246         if (substream->pcm_release) {
2247                 substream->pcm_release(substream);
2248                 substream->pcm_release = NULL;
2249         }
2250         snd_pcm_detach_substream(substream);
2251 }
2252 
2253 EXPORT_SYMBOL(snd_pcm_release_substream);
2254 
2255 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2256                            struct file *file,
2257                            struct snd_pcm_substream **rsubstream)
2258 {
2259         struct snd_pcm_substream *substream;
2260         int err;
2261 
2262         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2263         if (err < 0)
2264                 return err;
2265         if (substream->ref_count > 1) {
2266                 *rsubstream = substream;
2267                 return 0;
2268         }
2269 
2270         err = snd_pcm_hw_constraints_init(substream);
2271         if (err < 0) {
2272                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2273                 goto error;
2274         }
2275 
2276         if ((err = substream->ops->open(substream)) < 0)
2277                 goto error;
2278 
2279         substream->hw_opened = 1;
2280 
2281         err = snd_pcm_hw_constraints_complete(substream);
2282         if (err < 0) {
2283                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2284                 goto error;
2285         }
2286 
2287         *rsubstream = substream;
2288         return 0;
2289 
2290  error:
2291         snd_pcm_release_substream(substream);
2292         return err;
2293 }
2294 
2295 EXPORT_SYMBOL(snd_pcm_open_substream);
2296 
2297 static int snd_pcm_open_file(struct file *file,
2298                              struct snd_pcm *pcm,
2299                              int stream)
2300 {
2301         struct snd_pcm_file *pcm_file;
2302         struct snd_pcm_substream *substream;
2303         int err;
2304 
2305         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2306         if (err < 0)
2307                 return err;
2308 
2309         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2310         if (pcm_file == NULL) {
2311                 snd_pcm_release_substream(substream);
2312                 return -ENOMEM;
2313         }
2314         pcm_file->substream = substream;
2315         if (substream->ref_count == 1) {
2316                 substream->file = pcm_file;
2317                 substream->pcm_release = pcm_release_private;
2318         }
2319         file->private_data = pcm_file;
2320 
2321         return 0;
2322 }
2323 
2324 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2325 {
2326         struct snd_pcm *pcm;
2327         int err = nonseekable_open(inode, file);
2328         if (err < 0)
2329                 return err;
2330         pcm = snd_lookup_minor_data(iminor(inode),
2331                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2332         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2333         if (pcm)
2334                 snd_card_unref(pcm->card);
2335         return err;
2336 }
2337 
2338 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2339 {
2340         struct snd_pcm *pcm;
2341         int err = nonseekable_open(inode, file);
2342         if (err < 0)
2343                 return err;
2344         pcm = snd_lookup_minor_data(iminor(inode),
2345                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2346         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2347         if (pcm)
2348                 snd_card_unref(pcm->card);
2349         return err;
2350 }
2351 
2352 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2353 {
2354         int err;
2355         wait_queue_t wait;
2356 
2357         if (pcm == NULL) {
2358                 err = -ENODEV;
2359                 goto __error1;
2360         }
2361         err = snd_card_file_add(pcm->card, file);
2362         if (err < 0)
2363                 goto __error1;
2364         if (!try_module_get(pcm->card->module)) {
2365                 err = -EFAULT;
2366                 goto __error2;
2367         }
2368         init_waitqueue_entry(&wait, current);
2369         add_wait_queue(&pcm->open_wait, &wait);
2370         mutex_lock(&pcm->open_mutex);
2371         while (1) {
2372                 err = snd_pcm_open_file(file, pcm, stream);
2373                 if (err >= 0)
2374                         break;
2375                 if (err == -EAGAIN) {
2376                         if (file->f_flags & O_NONBLOCK) {
2377                                 err = -EBUSY;
2378                                 break;
2379                         }
2380                 } else
2381                         break;
2382                 set_current_state(TASK_INTERRUPTIBLE);
2383                 mutex_unlock(&pcm->open_mutex);
2384                 schedule();
2385                 mutex_lock(&pcm->open_mutex);
2386                 if (pcm->card->shutdown) {
2387                         err = -ENODEV;
2388                         break;
2389                 }
2390                 if (signal_pending(current)) {
2391                         err = -ERESTARTSYS;
2392                         break;
2393                 }
2394         }
2395         remove_wait_queue(&pcm->open_wait, &wait);
2396         mutex_unlock(&pcm->open_mutex);
2397         if (err < 0)
2398                 goto __error;
2399         return err;
2400 
2401       __error:
2402         module_put(pcm->card->module);
2403       __error2:
2404         snd_card_file_remove(pcm->card, file);
2405       __error1:
2406         return err;
2407 }
2408 
2409 static int snd_pcm_release(struct inode *inode, struct file *file)
2410 {
2411         struct snd_pcm *pcm;
2412         struct snd_pcm_substream *substream;
2413         struct snd_pcm_file *pcm_file;
2414 
2415         pcm_file = file->private_data;
2416         substream = pcm_file->substream;
2417         if (snd_BUG_ON(!substream))
2418                 return -ENXIO;
2419         pcm = substream->pcm;
2420         mutex_lock(&pcm->open_mutex);
2421         snd_pcm_release_substream(substream);
2422         kfree(pcm_file);
2423         mutex_unlock(&pcm->open_mutex);
2424         wake_up(&pcm->open_wait);
2425         module_put(pcm->card->module);
2426         snd_card_file_remove(pcm->card, file);
2427         return 0;
2428 }
2429 
2430 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2431                                                  snd_pcm_uframes_t frames)
2432 {
2433         struct snd_pcm_runtime *runtime = substream->runtime;
2434         snd_pcm_sframes_t appl_ptr;
2435         snd_pcm_sframes_t ret;
2436         snd_pcm_sframes_t hw_avail;
2437 
2438         if (frames == 0)
2439                 return 0;
2440 
2441         snd_pcm_stream_lock_irq(substream);
2442         switch (runtime->status->state) {
2443         case SNDRV_PCM_STATE_PREPARED:
2444                 break;
2445         case SNDRV_PCM_STATE_DRAINING:
2446         case SNDRV_PCM_STATE_RUNNING:
2447                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2448                         break;
2449                 /* Fall through */
2450         case SNDRV_PCM_STATE_XRUN:
2451                 ret = -EPIPE;
2452                 goto __end;
2453         case SNDRV_PCM_STATE_SUSPENDED:
2454                 ret = -ESTRPIPE;
2455                 goto __end;
2456         default:
2457                 ret = -EBADFD;
2458                 goto __end;
2459         }
2460 
2461         hw_avail = snd_pcm_playback_hw_avail(runtime);
2462         if (hw_avail <= 0) {
2463                 ret = 0;
2464                 goto __end;
2465         }
2466         if (frames > (snd_pcm_uframes_t)hw_avail)
2467                 frames = hw_avail;
2468         appl_ptr = runtime->control->appl_ptr - frames;
2469         if (appl_ptr < 0)
2470                 appl_ptr += runtime->boundary;
2471         runtime->control->appl_ptr = appl_ptr;
2472         ret = frames;
2473  __end:
2474         snd_pcm_stream_unlock_irq(substream);
2475         return ret;
2476 }
2477 
2478 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2479                                                 snd_pcm_uframes_t frames)
2480 {
2481         struct snd_pcm_runtime *runtime = substream->runtime;
2482         snd_pcm_sframes_t appl_ptr;
2483         snd_pcm_sframes_t ret;
2484         snd_pcm_sframes_t hw_avail;
2485 
2486         if (frames == 0)
2487                 return 0;
2488 
2489         snd_pcm_stream_lock_irq(substream);
2490         switch (runtime->status->state) {
2491         case SNDRV_PCM_STATE_PREPARED:
2492         case SNDRV_PCM_STATE_DRAINING:
2493                 break;
2494         case SNDRV_PCM_STATE_RUNNING:
2495                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2496                         break;
2497                 /* Fall through */
2498         case SNDRV_PCM_STATE_XRUN:
2499                 ret = -EPIPE;
2500                 goto __end;
2501         case SNDRV_PCM_STATE_SUSPENDED:
2502                 ret = -ESTRPIPE;
2503                 goto __end;
2504         default:
2505                 ret = -EBADFD;
2506                 goto __end;
2507         }
2508 
2509         hw_avail = snd_pcm_capture_hw_avail(runtime);
2510         if (hw_avail <= 0) {
2511                 ret = 0;
2512                 goto __end;
2513         }
2514         if (frames > (snd_pcm_uframes_t)hw_avail)
2515                 frames = hw_avail;
2516         appl_ptr = runtime->control->appl_ptr - frames;
2517         if (appl_ptr < 0)
2518                 appl_ptr += runtime->boundary;
2519         runtime->control->appl_ptr = appl_ptr;
2520         ret = frames;
2521  __end:
2522         snd_pcm_stream_unlock_irq(substream);
2523         return ret;
2524 }
2525 
2526 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2527                                                   snd_pcm_uframes_t frames)
2528 {
2529         struct snd_pcm_runtime *runtime = substream->runtime;
2530         snd_pcm_sframes_t appl_ptr;
2531         snd_pcm_sframes_t ret;
2532         snd_pcm_sframes_t avail;
2533 
2534         if (frames == 0)
2535                 return 0;
2536 
2537         snd_pcm_stream_lock_irq(substream);
2538         switch (runtime->status->state) {
2539         case SNDRV_PCM_STATE_PREPARED:
2540         case SNDRV_PCM_STATE_PAUSED:
2541                 break;
2542         case SNDRV_PCM_STATE_DRAINING:
2543         case SNDRV_PCM_STATE_RUNNING:
2544                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2545                         break;
2546                 /* Fall through */
2547         case SNDRV_PCM_STATE_XRUN:
2548                 ret = -EPIPE;
2549                 goto __end;
2550         case SNDRV_PCM_STATE_SUSPENDED:
2551                 ret = -ESTRPIPE;
2552                 goto __end;
2553         default:
2554                 ret = -EBADFD;
2555                 goto __end;
2556         }
2557 
2558         avail = snd_pcm_playback_avail(runtime);
2559         if (avail <= 0) {
2560                 ret = 0;
2561                 goto __end;
2562         }
2563         if (frames > (snd_pcm_uframes_t)avail)
2564                 frames = avail;
2565         appl_ptr = runtime->control->appl_ptr + frames;
2566         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2567                 appl_ptr -= runtime->boundary;
2568         runtime->control->appl_ptr = appl_ptr;
2569         ret = frames;
2570  __end:
2571         snd_pcm_stream_unlock_irq(substream);
2572         return ret;
2573 }
2574 
2575 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2576                                                  snd_pcm_uframes_t frames)
2577 {
2578         struct snd_pcm_runtime *runtime = substream->runtime;
2579         snd_pcm_sframes_t appl_ptr;
2580         snd_pcm_sframes_t ret;
2581         snd_pcm_sframes_t avail;
2582 
2583         if (frames == 0)
2584                 return 0;
2585 
2586         snd_pcm_stream_lock_irq(substream);
2587         switch (runtime->status->state) {
2588         case SNDRV_PCM_STATE_PREPARED:
2589         case SNDRV_PCM_STATE_DRAINING:
2590         case SNDRV_PCM_STATE_PAUSED:
2591                 break;
2592         case SNDRV_PCM_STATE_RUNNING:
2593                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2594                         break;
2595                 /* Fall through */
2596         case SNDRV_PCM_STATE_XRUN:
2597                 ret = -EPIPE;
2598                 goto __end;
2599         case SNDRV_PCM_STATE_SUSPENDED:
2600                 ret = -ESTRPIPE;
2601                 goto __end;
2602         default:
2603                 ret = -EBADFD;
2604                 goto __end;
2605         }
2606 
2607         avail = snd_pcm_capture_avail(runtime);
2608         if (avail <= 0) {
2609                 ret = 0;
2610                 goto __end;
2611         }
2612         if (frames > (snd_pcm_uframes_t)avail)
2613                 frames = avail;
2614         appl_ptr = runtime->control->appl_ptr + frames;
2615         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2616                 appl_ptr -= runtime->boundary;
2617         runtime->control->appl_ptr = appl_ptr;
2618         ret = frames;
2619  __end:
2620         snd_pcm_stream_unlock_irq(substream);
2621         return ret;
2622 }
2623 
2624 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2625 {
2626         struct snd_pcm_runtime *runtime = substream->runtime;
2627         int err;
2628 
2629         snd_pcm_stream_lock_irq(substream);
2630         switch (runtime->status->state) {
2631         case SNDRV_PCM_STATE_DRAINING:
2632                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2633                         goto __badfd;
2634                 /* Fall through */
2635         case SNDRV_PCM_STATE_RUNNING:
2636                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2637                         break;
2638                 /* Fall through */
2639         case SNDRV_PCM_STATE_PREPARED:
2640         case SNDRV_PCM_STATE_SUSPENDED:
2641                 err = 0;
2642                 break;
2643         case SNDRV_PCM_STATE_XRUN:
2644                 err = -EPIPE;
2645                 break;
2646         default:
2647               __badfd:
2648                 err = -EBADFD;
2649                 break;
2650         }
2651         snd_pcm_stream_unlock_irq(substream);
2652         return err;
2653 }
2654                 
2655 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2656                          snd_pcm_sframes_t __user *res)
2657 {
2658         struct snd_pcm_runtime *runtime = substream->runtime;
2659         int err;
2660         snd_pcm_sframes_t n = 0;
2661 
2662         snd_pcm_stream_lock_irq(substream);
2663         switch (runtime->status->state) {
2664         case SNDRV_PCM_STATE_DRAINING:
2665                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2666                         goto __badfd;
2667                 /* Fall through */
2668         case SNDRV_PCM_STATE_RUNNING:
2669                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2670                         break;
2671                 /* Fall through */
2672         case SNDRV_PCM_STATE_PREPARED:
2673         case SNDRV_PCM_STATE_SUSPENDED:
2674                 err = 0;
2675                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2676                         n = snd_pcm_playback_hw_avail(runtime);
2677                 else
2678                         n = snd_pcm_capture_avail(runtime);
2679                 n += runtime->delay;
2680                 break;
2681         case SNDRV_PCM_STATE_XRUN:
2682                 err = -EPIPE;
2683                 break;
2684         default:
2685               __badfd:
2686                 err = -EBADFD;
2687                 break;
2688         }
2689         snd_pcm_stream_unlock_irq(substream);
2690         if (!err)
2691                 if (put_user(n, res))
2692                         err = -EFAULT;
2693         return err;
2694 }
2695                 
2696 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2697                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2698 {
2699         struct snd_pcm_runtime *runtime = substream->runtime;
2700         struct snd_pcm_sync_ptr sync_ptr;
2701         volatile struct snd_pcm_mmap_status *status;
2702         volatile struct snd_pcm_mmap_control *control;
2703         int err;
2704 
2705         memset(&sync_ptr, 0, sizeof(sync_ptr));
2706         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2707                 return -EFAULT;
2708         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2709                 return -EFAULT; 
2710         status = runtime->status;
2711         control = runtime->control;
2712         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2713                 err = snd_pcm_hwsync(substream);
2714                 if (err < 0)
2715                         return err;
2716         }
2717         snd_pcm_stream_lock_irq(substream);
2718         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2719                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2720         else
2721                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2722         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2723                 control->avail_min = sync_ptr.c.control.avail_min;
2724         else
2725                 sync_ptr.c.control.avail_min = control->avail_min;
2726         sync_ptr.s.status.state = status->state;
2727         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2728         sync_ptr.s.status.tstamp = status->tstamp;
2729         sync_ptr.s.status.suspended_state = status->suspended_state;
2730         snd_pcm_stream_unlock_irq(substream);
2731         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2732                 return -EFAULT;
2733         return 0;
2734 }
2735 
2736 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2737 {
2738         struct snd_pcm_runtime *runtime = substream->runtime;
2739         int arg;
2740         
2741         if (get_user(arg, _arg))
2742                 return -EFAULT;
2743         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2744                 return -EINVAL;
2745         runtime->tstamp_type = arg;
2746         return 0;
2747 }
2748                 
2749 static int snd_pcm_common_ioctl1(struct file *file,
2750                                  struct snd_pcm_substream *substream,
2751                                  unsigned int cmd, void __user *arg)
2752 {
2753         switch (cmd) {
2754         case SNDRV_PCM_IOCTL_PVERSION:
2755                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2756         case SNDRV_PCM_IOCTL_INFO:
2757                 return snd_pcm_info_user(substream, arg);
2758         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2759                 return 0;
2760         case SNDRV_PCM_IOCTL_TTSTAMP:
2761                 return snd_pcm_tstamp(substream, arg);
2762         case SNDRV_PCM_IOCTL_HW_REFINE:
2763                 return snd_pcm_hw_refine_user(substream, arg);
2764         case SNDRV_PCM_IOCTL_HW_PARAMS:
2765                 return snd_pcm_hw_params_user(substream, arg);
2766         case SNDRV_PCM_IOCTL_HW_FREE:
2767                 return snd_pcm_hw_free(substream);
2768         case SNDRV_PCM_IOCTL_SW_PARAMS:
2769                 return snd_pcm_sw_params_user(substream, arg);
2770         case SNDRV_PCM_IOCTL_STATUS:
2771                 return snd_pcm_status_user(substream, arg, false);
2772         case SNDRV_PCM_IOCTL_STATUS_EXT:
2773                 return snd_pcm_status_user(substream, arg, true);
2774         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2775                 return snd_pcm_channel_info_user(substream, arg);
2776         case SNDRV_PCM_IOCTL_PREPARE:
2777                 return snd_pcm_prepare(substream, file);
2778         case SNDRV_PCM_IOCTL_RESET:
2779                 return snd_pcm_reset(substream);
2780         case SNDRV_PCM_IOCTL_START:
2781                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2782         case SNDRV_PCM_IOCTL_LINK:
2783                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2784         case SNDRV_PCM_IOCTL_UNLINK:
2785                 return snd_pcm_unlink(substream);
2786         case SNDRV_PCM_IOCTL_RESUME:
2787                 return snd_pcm_resume(substream);
2788         case SNDRV_PCM_IOCTL_XRUN:
2789                 return snd_pcm_xrun(substream);
2790         case SNDRV_PCM_IOCTL_HWSYNC:
2791                 return snd_pcm_hwsync(substream);
2792         case SNDRV_PCM_IOCTL_DELAY:
2793                 return snd_pcm_delay(substream, arg);
2794         case SNDRV_PCM_IOCTL_SYNC_PTR:
2795                 return snd_pcm_sync_ptr(substream, arg);
2796 #ifdef CONFIG_SND_SUPPORT_OLD_API
2797         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2798                 return snd_pcm_hw_refine_old_user(substream, arg);
2799         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2800                 return snd_pcm_hw_params_old_user(substream, arg);
2801 #endif
2802         case SNDRV_PCM_IOCTL_DRAIN:
2803                 return snd_pcm_drain(substream, file);
2804         case SNDRV_PCM_IOCTL_DROP:
2805                 return snd_pcm_drop(substream);
2806         case SNDRV_PCM_IOCTL_PAUSE:
2807         {
2808                 int res;
2809                 snd_pcm_stream_lock_irq(substream);
2810                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2811                 snd_pcm_stream_unlock_irq(substream);
2812                 return res;
2813         }
2814         }
2815         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2816         return -ENOTTY;
2817 }
2818 
2819 static int snd_pcm_playback_ioctl1(struct file *file,
2820                                    struct snd_pcm_substream *substream,
2821                                    unsigned int cmd, void __user *arg)
2822 {
2823         if (snd_BUG_ON(!substream))
2824                 return -ENXIO;
2825         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2826                 return -EINVAL;
2827         switch (cmd) {
2828         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2829         {
2830                 struct snd_xferi xferi;
2831                 struct snd_xferi __user *_xferi = arg;
2832                 struct snd_pcm_runtime *runtime = substream->runtime;
2833                 snd_pcm_sframes_t result;
2834                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2835                         return -EBADFD;
2836                 if (put_user(0, &_xferi->result))
2837                         return -EFAULT;
2838                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2839                         return -EFAULT;
2840                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2841                 __put_user(result, &_xferi->result);
2842                 return result < 0 ? result : 0;
2843         }
2844         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2845         {
2846                 struct snd_xfern xfern;
2847                 struct snd_xfern __user *_xfern = arg;
2848                 struct snd_pcm_runtime *runtime = substream->runtime;
2849                 void __user **bufs;
2850                 snd_pcm_sframes_t result;
2851                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2852                         return -EBADFD;
2853                 if (runtime->channels > 128)
2854                         return -EINVAL;
2855                 if (put_user(0, &_xfern->result))
2856                         return -EFAULT;
2857                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2858                         return -EFAULT;
2859 
2860                 bufs = memdup_user(xfern.bufs,
2861                                    sizeof(void *) * runtime->channels);
2862                 if (IS_ERR(bufs))
2863                         return PTR_ERR(bufs);
2864                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2865                 kfree(bufs);
2866                 __put_user(result, &_xfern->result);
2867                 return result < 0 ? result : 0;
2868         }
2869         case SNDRV_PCM_IOCTL_REWIND:
2870         {
2871                 snd_pcm_uframes_t frames;
2872                 snd_pcm_uframes_t __user *_frames = arg;
2873                 snd_pcm_sframes_t result;
2874                 if (get_user(frames, _frames))
2875                         return -EFAULT;
2876                 if (put_user(0, _frames))
2877                         return -EFAULT;
2878                 result = snd_pcm_playback_rewind(substream, frames);
2879                 __put_user(result, _frames);
2880                 return result < 0 ? result : 0;
2881         }
2882         case SNDRV_PCM_IOCTL_FORWARD:
2883         {
2884                 snd_pcm_uframes_t frames;
2885                 snd_pcm_uframes_t __user *_frames = arg;
2886                 snd_pcm_sframes_t result;
2887                 if (get_user(frames, _frames))
2888                         return -EFAULT;
2889                 if (put_user(0, _frames))
2890                         return -EFAULT;
2891                 result = snd_pcm_playback_forward(substream, frames);
2892                 __put_user(result, _frames);
2893                 return result < 0 ? result : 0;
2894         }
2895         }
2896         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2897 }
2898 
2899 static int snd_pcm_capture_ioctl1(struct file *file,
2900                                   struct snd_pcm_substream *substream,
2901                                   unsigned int cmd, void __user *arg)
2902 {
2903         if (snd_BUG_ON(!substream))
2904                 return -ENXIO;
2905         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2906                 return -EINVAL;
2907         switch (cmd) {
2908         case SNDRV_PCM_IOCTL_READI_FRAMES:
2909         {
2910                 struct snd_xferi xferi;
2911                 struct snd_xferi __user *_xferi = arg;
2912                 struct snd_pcm_runtime *runtime = substream->runtime;
2913                 snd_pcm_sframes_t result;
2914                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2915                         return -EBADFD;
2916                 if (put_user(0, &_xferi->result))
2917                         return -EFAULT;
2918                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2919                         return -EFAULT;
2920                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2921                 __put_user(result, &_xferi->result);
2922                 return result < 0 ? result : 0;
2923         }
2924         case SNDRV_PCM_IOCTL_READN_FRAMES:
2925         {
2926                 struct snd_xfern xfern;
2927                 struct snd_xfern __user *_xfern = arg;
2928                 struct snd_pcm_runtime *runtime = substream->runtime;
2929                 void *bufs;
2930                 snd_pcm_sframes_t result;
2931                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932                         return -EBADFD;
2933                 if (runtime->channels > 128)
2934                         return -EINVAL;
2935                 if (put_user(0, &_xfern->result))
2936                         return -EFAULT;
2937                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2938                         return -EFAULT;
2939 
2940                 bufs = memdup_user(xfern.bufs,
2941                                    sizeof(void *) * runtime->channels);
2942                 if (IS_ERR(bufs))
2943                         return PTR_ERR(bufs);
2944                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2945                 kfree(bufs);
2946                 __put_user(result, &_xfern->result);
2947                 return result < 0 ? result : 0;
2948         }
2949         case SNDRV_PCM_IOCTL_REWIND:
2950         {
2951                 snd_pcm_uframes_t frames;
2952                 snd_pcm_uframes_t __user *_frames = arg;
2953                 snd_pcm_sframes_t result;
2954                 if (get_user(frames, _frames))
2955                         return -EFAULT;
2956                 if (put_user(0, _frames))
2957                         return -EFAULT;
2958                 result = snd_pcm_capture_rewind(substream, frames);
2959                 __put_user(result, _frames);
2960                 return result < 0 ? result : 0;
2961         }
2962         case SNDRV_PCM_IOCTL_FORWARD:
2963         {
2964                 snd_pcm_uframes_t frames;
2965                 snd_pcm_uframes_t __user *_frames = arg;
2966                 snd_pcm_sframes_t result;
2967                 if (get_user(frames, _frames))
2968                         return -EFAULT;
2969                 if (put_user(0, _frames))
2970                         return -EFAULT;
2971                 result = snd_pcm_capture_forward(substream, frames);
2972                 __put_user(result, _frames);
2973                 return result < 0 ? result : 0;
2974         }
2975         }
2976         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2977 }
2978 
2979 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2980                                    unsigned long arg)
2981 {
2982         struct snd_pcm_file *pcm_file;
2983 
2984         pcm_file = file->private_data;
2985 
2986         if (((cmd >> 8) & 0xff) != 'A')
2987                 return -ENOTTY;
2988 
2989         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2990                                        (void __user *)arg);
2991 }
2992 
2993 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2994                                   unsigned long arg)
2995 {
2996         struct snd_pcm_file *pcm_file;
2997 
2998         pcm_file = file->private_data;
2999 
3000         if (((cmd >> 8) & 0xff) != 'A')
3001                 return -ENOTTY;
3002 
3003         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3004                                       (void __user *)arg);
3005 }
3006 
3007 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3008                          unsigned int cmd, void *arg)
3009 {
3010         mm_segment_t fs;
3011         int result;
3012         
3013         fs = snd_enter_user();
3014         switch (substream->stream) {
3015         case SNDRV_PCM_STREAM_PLAYBACK:
3016                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3017                                                  (void __user *)arg);
3018                 break;
3019         case SNDRV_PCM_STREAM_CAPTURE:
3020                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3021                                                 (void __user *)arg);
3022                 break;
3023         default:
3024                 result = -EINVAL;
3025                 break;
3026         }
3027         snd_leave_user(fs);
3028         return result;
3029 }
3030 
3031 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3032 
3033 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3034                             loff_t * offset)
3035 {
3036         struct snd_pcm_file *pcm_file;
3037         struct snd_pcm_substream *substream;
3038         struct snd_pcm_runtime *runtime;
3039         snd_pcm_sframes_t result;
3040 
3041         pcm_file = file->private_data;
3042         substream = pcm_file->substream;
3043         if (PCM_RUNTIME_CHECK(substream))
3044                 return -ENXIO;
3045         runtime = substream->runtime;
3046         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3047                 return -EBADFD;
3048         if (!frame_aligned(runtime, count))
3049                 return -EINVAL;
3050         count = bytes_to_frames(runtime, count);
3051         result = snd_pcm_lib_read(substream, buf, count);
3052         if (result > 0)
3053                 result = frames_to_bytes(runtime, result);
3054         return result;
3055 }
3056 
3057 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3058                              size_t count, loff_t * offset)
3059 {
3060         struct snd_pcm_file *pcm_file;
3061         struct snd_pcm_substream *substream;
3062         struct snd_pcm_runtime *runtime;
3063         snd_pcm_sframes_t result;
3064 
3065         pcm_file = file->private_data;
3066         substream = pcm_file->substream;
3067         if (PCM_RUNTIME_CHECK(substream))
3068                 return -ENXIO;
3069         runtime = substream->runtime;
3070         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3071                 return -EBADFD;
3072         if (!frame_aligned(runtime, count))
3073                 return -EINVAL;
3074         count = bytes_to_frames(runtime, count);
3075         result = snd_pcm_lib_write(substream, buf, count);
3076         if (result > 0)
3077                 result = frames_to_bytes(runtime, result);
3078         return result;
3079 }
3080 
3081 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3082 {
3083         struct snd_pcm_file *pcm_file;
3084         struct snd_pcm_substream *substream;
3085         struct snd_pcm_runtime *runtime;
3086         snd_pcm_sframes_t result;
3087         unsigned long i;
3088         void __user **bufs;
3089         snd_pcm_uframes_t frames;
3090 
3091         pcm_file = iocb->ki_filp->private_data;
3092         substream = pcm_file->substream;
3093         if (PCM_RUNTIME_CHECK(substream))
3094                 return -ENXIO;
3095         runtime = substream->runtime;
3096         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3097                 return -EBADFD;
3098         if (!iter_is_iovec(to))
3099                 return -EINVAL;
3100         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3101                 return -EINVAL;
3102         if (!frame_aligned(runtime, to->iov->iov_len))
3103                 return -EINVAL;
3104         frames = bytes_to_samples(runtime, to->iov->iov_len);
3105         bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3106         if (bufs == NULL)
3107                 return -ENOMEM;
3108         for (i = 0; i < to->nr_segs; ++i)
3109                 bufs[i] = to->iov[i].iov_base;
3110         result = snd_pcm_lib_readv(substream, bufs, frames);
3111         if (result > 0)
3112                 result = frames_to_bytes(runtime, result);
3113         kfree(bufs);
3114         return result;
3115 }
3116 
3117 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3118 {
3119         struct snd_pcm_file *pcm_file;
3120         struct snd_pcm_substream *substream;
3121         struct snd_pcm_runtime *runtime;
3122         snd_pcm_sframes_t result;
3123         unsigned long i;
3124         void __user **bufs;
3125         snd_pcm_uframes_t frames;
3126 
3127         pcm_file = iocb->ki_filp->private_data;
3128         substream = pcm_file->substream;
3129         if (PCM_RUNTIME_CHECK(substream))
3130                 return -ENXIO;
3131         runtime = substream->runtime;
3132         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3133                 return -EBADFD;
3134         if (!iter_is_iovec(from))
3135                 return -EINVAL;
3136         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3137             !frame_aligned(runtime, from->iov->iov_len))
3138                 return -EINVAL;
3139         frames = bytes_to_samples(runtime, from->iov->iov_len);
3140         bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3141         if (bufs == NULL)
3142                 return -ENOMEM;
3143         for (i = 0; i < from->nr_segs; ++i)
3144                 bufs[i] = from->iov[i].iov_base;
3145         result = snd_pcm_lib_writev(substream, bufs, frames);
3146         if (result > 0)
3147                 result = frames_to_bytes(runtime, result);
3148         kfree(bufs);
3149         return result;
3150 }
3151 
3152 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3153 {
3154         struct snd_pcm_file *pcm_file;
3155         struct snd_pcm_substream *substream;
3156         struct snd_pcm_runtime *runtime;
3157         unsigned int mask;
3158         snd_pcm_uframes_t avail;
3159 
3160         pcm_file = file->private_data;
3161 
3162         substream = pcm_file->substream;
3163         if (PCM_RUNTIME_CHECK(substream))
3164                 return -ENXIO;
3165         runtime = substream->runtime;
3166 
3167         poll_wait(file, &runtime->sleep, wait);
3168 
3169         snd_pcm_stream_lock_irq(substream);
3170         avail = snd_pcm_playback_avail(runtime);
3171         switch (runtime->status->state) {
3172         case SNDRV_PCM_STATE_RUNNING:
3173         case SNDRV_PCM_STATE_PREPARED:
3174         case SNDRV_PCM_STATE_PAUSED:
3175                 if (avail >= runtime->control->avail_min) {
3176                         mask = POLLOUT | POLLWRNORM;
3177                         break;
3178                 }
3179                 /* Fall through */
3180         case SNDRV_PCM_STATE_DRAINING:
3181                 mask = 0;
3182                 break;
3183         default:
3184                 mask = POLLOUT | POLLWRNORM | POLLERR;
3185                 break;
3186         }
3187         snd_pcm_stream_unlock_irq(substream);
3188         return mask;
3189 }
3190 
3191 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3192 {
3193         struct snd_pcm_file *pcm_file;
3194         struct snd_pcm_substream *substream;
3195         struct snd_pcm_runtime *runtime;
3196         unsigned int mask;
3197         snd_pcm_uframes_t avail;
3198 
3199         pcm_file = file->private_data;
3200 
3201         substream = pcm_file->substream;
3202         if (PCM_RUNTIME_CHECK(substream))
3203                 return -ENXIO;
3204         runtime = substream->runtime;
3205 
3206         poll_wait(file, &runtime->sleep, wait);
3207 
3208         snd_pcm_stream_lock_irq(substream);
3209         avail = snd_pcm_capture_avail(runtime);
3210         switch (runtime->status->state) {
3211         case SNDRV_PCM_STATE_RUNNING:
3212         case SNDRV_PCM_STATE_PREPARED:
3213         case SNDRV_PCM_STATE_PAUSED:
3214                 if (avail >= runtime->control->avail_min) {
3215                         mask = POLLIN | POLLRDNORM;
3216                         break;
3217                 }
3218                 mask = 0;
3219                 break;
3220         case SNDRV_PCM_STATE_DRAINING:
3221                 if (avail > 0) {
3222                         mask = POLLIN | POLLRDNORM;
3223                         break;
3224                 }
3225                 /* Fall through */
3226         default:
3227                 mask = POLLIN | POLLRDNORM | POLLERR;
3228                 break;
3229         }
3230         snd_pcm_stream_unlock_irq(substream);
3231         return mask;
3232 }
3233 
3234 /*
3235  * mmap support
3236  */
3237 
3238 /*
3239  * Only on coherent architectures, we can mmap the status and the control records
3240  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3241  */
3242 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3243 /*
3244  * mmap status record
3245  */
3246 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3247                                                 struct vm_fault *vmf)
3248 {
3249         struct snd_pcm_substream *substream = area->vm_private_data;
3250         struct snd_pcm_runtime *runtime;
3251         
3252         if (substream == NULL)
3253                 return VM_FAULT_SIGBUS;
3254         runtime = substream->runtime;
3255         vmf->page = virt_to_page(runtime->status);
3256         get_page(vmf->page);
3257         return 0;
3258 }
3259 
3260 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3261 {
3262         .fault =        snd_pcm_mmap_status_fault,
3263 };
3264 
3265 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3266                                struct vm_area_struct *area)
3267 {
3268         long size;
3269         if (!(area->vm_flags & VM_READ))
3270                 return -EINVAL;
3271         size = area->vm_end - area->vm_start;
3272         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3273                 return -EINVAL;
3274         area->vm_ops = &snd_pcm_vm_ops_status;
3275         area->vm_private_data = substream;
3276         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3277         return 0;
3278 }
3279 
3280 /*
3281  * mmap control record
3282  */
3283 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3284                                                 struct vm_fault *vmf)
3285 {
3286         struct snd_pcm_substream *substream = area->vm_private_data;
3287         struct snd_pcm_runtime *runtime;
3288         
3289         if (substream == NULL)
3290                 return VM_FAULT_SIGBUS;
3291         runtime = substream->runtime;
3292         vmf->page = virt_to_page(runtime->control);
3293         get_page(vmf->page);
3294         return 0;
3295 }
3296 
3297 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3298 {
3299         .fault =        snd_pcm_mmap_control_fault,
3300 };
3301 
3302 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3303                                 struct vm_area_struct *area)
3304 {
3305         long size;
3306         if (!(area->vm_flags & VM_READ))
3307                 return -EINVAL;
3308         size = area->vm_end - area->vm_start;
3309         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3310                 return -EINVAL;
3311         area->vm_ops = &snd_pcm_vm_ops_control;
3312         area->vm_private_data = substream;
3313         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3314         return 0;
3315 }
3316 #else /* ! coherent mmap */
3317 /*
3318  * don't support mmap for status and control records.
3319  */
3320 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3321                                struct vm_area_struct *area)
3322 {
3323         return -ENXIO;
3324 }
3325 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3326                                 struct vm_area_struct *area)
3327 {
3328         return -ENXIO;
3329 }
3330 #endif /* coherent mmap */
3331 
3332 static inline struct page *
3333 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3334 {
3335         void *vaddr = substream->runtime->dma_area + ofs;
3336         return virt_to_page(vaddr);
3337 }
3338 
3339 /*
3340  * fault callback for mmapping a RAM page
3341  */
3342 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3343                                                 struct vm_fault *vmf)
3344 {
3345         struct snd_pcm_substream *substream = area->vm_private_data;
3346         struct snd_pcm_runtime *runtime;
3347         unsigned long offset;
3348         struct page * page;
3349         size_t dma_bytes;
3350         
3351         if (substream == NULL)
3352                 return VM_FAULT_SIGBUS;
3353         runtime = substream->runtime;
3354         offset = vmf->pgoff << PAGE_SHIFT;
3355         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3356         if (offset > dma_bytes - PAGE_SIZE)
3357                 return VM_FAULT_SIGBUS;
3358         if (substream->ops->page)
3359                 page = substream->ops->page(substream, offset);
3360         else
3361                 page = snd_pcm_default_page_ops(substream, offset);
3362         if (!page)
3363                 return VM_FAULT_SIGBUS;
3364         get_page(page);
3365         vmf->page = page;
3366         return 0;
3367 }
3368 
3369 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3370         .open =         snd_pcm_mmap_data_open,
3371         .close =        snd_pcm_mmap_data_close,
3372 };
3373 
3374 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3375         .open =         snd_pcm_mmap_data_open,
3376         .close =        snd_pcm_mmap_data_close,
3377         .fault =        snd_pcm_mmap_data_fault,
3378 };
3379 
3380 /*
3381  * mmap the DMA buffer on RAM
3382  */
3383 
3384 /**
3385  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3386  * @substream: PCM substream
3387  * @area: VMA
3388  *
3389  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3390  * this function is invoked implicitly.
3391  */
3392 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3393                              struct vm_area_struct *area)
3394 {
3395         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3396 #ifdef CONFIG_GENERIC_ALLOCATOR
3397         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3398                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3399                 return remap_pfn_range(area, area->vm_start,
3400                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3401                                 area->vm_end - area->vm_start, area->vm_page_prot);
3402         }
3403 #endif /* CONFIG_GENERIC_ALLOCATOR */
3404 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3405         if (!substream->ops->page &&
3406             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3407                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3408                                          area,
3409                                          substream->runtime->dma_area,
3410                                          substream->runtime->dma_addr,
3411                                          area->vm_end - area->vm_start);
3412 #endif /* CONFIG_X86 */
3413         /* mmap with fault handler */
3414         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3415         return 0;
3416 }
3417 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3418 
3419 /*
3420  * mmap the DMA buffer on I/O memory area
3421  */
3422 #if SNDRV_PCM_INFO_MMAP_IOMEM
3423 /**
3424  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3425  * @substream: PCM substream
3426  * @area: VMA
3427  *
3428  * When your hardware uses the iomapped pages as the hardware buffer and
3429  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3430  * is supposed to work only on limited architectures.
3431  */
3432 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3433                            struct vm_area_struct *area)
3434 {
3435         struct snd_pcm_runtime *runtime = substream->runtime;;
3436 
3437         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3438         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3439 }
3440 
3441 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3442 #endif /* SNDRV_PCM_INFO_MMAP */
3443 
3444 /*
3445  * mmap DMA buffer
3446  */
3447 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3448                       struct vm_area_struct *area)
3449 {
3450         struct snd_pcm_runtime *runtime;
3451         long size;
3452         unsigned long offset;
3453         size_t dma_bytes;
3454         int err;
3455 
3456         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3457                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3458                         return -EINVAL;
3459         } else {
3460                 if (!(area->vm_flags & VM_READ))
3461                         return -EINVAL;
3462         }
3463         runtime = substream->runtime;
3464         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3465                 return -EBADFD;
3466         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3467                 return -ENXIO;
3468         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3469             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3470                 return -EINVAL;
3471         size = area->vm_end - area->vm_start;
3472         offset = area->vm_pgoff << PAGE_SHIFT;
3473         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3474         if ((size_t)size > dma_bytes)
3475                 return -EINVAL;
3476         if (offset > dma_bytes - size)
3477                 return -EINVAL;
3478 
3479         area->vm_ops = &snd_pcm_vm_ops_data;
3480         area->vm_private_data = substream;
3481         if (substream->ops->mmap)
3482                 err = substream->ops->mmap(substream, area);
3483         else
3484                 err = snd_pcm_lib_default_mmap(substream, area);
3485         if (!err)
3486                 atomic_inc(&substream->mmap_count);
3487         return err;
3488 }
3489 
3490 EXPORT_SYMBOL(snd_pcm_mmap_data);
3491 
3492 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3493 {
3494         struct snd_pcm_file * pcm_file;
3495         struct snd_pcm_substream *substream;    
3496         unsigned long offset;
3497         
3498         pcm_file = file->private_data;
3499         substream = pcm_file->substream;
3500         if (PCM_RUNTIME_CHECK(substream))
3501                 return -ENXIO;
3502 
3503         offset = area->vm_pgoff << PAGE_SHIFT;
3504         switch (offset) {
3505         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3506                 if (pcm_file->no_compat_mmap)
3507                         return -ENXIO;
3508                 return snd_pcm_mmap_status(substream, file, area);
3509         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3510                 if (pcm_file->no_compat_mmap)
3511                         return -ENXIO;
3512                 return snd_pcm_mmap_control(substream, file, area);
3513         default:
3514                 return snd_pcm_mmap_data(substream, file, area);
3515         }
3516         return 0;
3517 }
3518 
3519 static int snd_pcm_fasync(int fd, struct file * file, int on)
3520 {
3521         struct snd_pcm_file * pcm_file;
3522         struct snd_pcm_substream *substream;
3523         struct snd_pcm_runtime *runtime;
3524 
3525         pcm_file = file->private_data;
3526         substream = pcm_file->substream;
3527         if (PCM_RUNTIME_CHECK(substream))
3528                 return -ENXIO;
3529         runtime = substream->runtime;
3530         return fasync_helper(fd, file, on, &runtime->fasync);
3531 }
3532 
3533 /*
3534  * ioctl32 compat
3535  */
3536 #ifdef CONFIG_COMPAT
3537 #include "pcm_compat.c"
3538 #else
3539 #define snd_pcm_ioctl_compat    NULL
3540 #endif
3541 
3542 /*
3543  *  To be removed helpers to keep binary compatibility
3544  */
3545 
3546 #ifdef CONFIG_SND_SUPPORT_OLD_API
3547 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3548 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3549 
3550 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3551                                                struct snd_pcm_hw_params_old *oparams)
3552 {
3553         unsigned int i;
3554 
3555         memset(params, 0, sizeof(*params));
3556         params->flags = oparams->flags;
3557         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3558                 params->masks[i].bits[0] = oparams->masks[i];
3559         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3560         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3561         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3562         params->info = oparams->info;
3563         params->msbits = oparams->msbits;
3564         params->rate_num = oparams->rate_num;
3565         params->rate_den = oparams->rate_den;
3566         params->fifo_size = oparams->fifo_size;
3567 }
3568 
3569 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3570                                              struct snd_pcm_hw_params *params)
3571 {
3572         unsigned int i;
3573 
3574         memset(oparams, 0, sizeof(*oparams));
3575         oparams->flags = params->flags;
3576         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3577                 oparams->masks[i] = params->masks[i].bits[0];
3578         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3579         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3580         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3581         oparams->info = params->info;
3582         oparams->msbits = params->msbits;
3583         oparams->rate_num = params->rate_num;
3584         oparams->rate_den = params->rate_den;
3585         oparams->fifo_size = params->fifo_size;
3586 }
3587 
3588 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3589                                       struct snd_pcm_hw_params_old __user * _oparams)
3590 {
3591         struct snd_pcm_hw_params *params;
3592         struct snd_pcm_hw_params_old *oparams = NULL;
3593         int err;
3594 
3595         params = kmalloc(sizeof(*params), GFP_KERNEL);
3596         if (!params)
3597                 return -ENOMEM;
3598 
3599         oparams = memdup_user(_oparams, sizeof(*oparams));
3600         if (IS_ERR(oparams)) {
3601                 err = PTR_ERR(oparams);
3602                 goto out;
3603         }
3604         snd_pcm_hw_convert_from_old_params(params, oparams);
3605         err = snd_pcm_hw_refine(substream, params);
3606         snd_pcm_hw_convert_to_old_params(oparams, params);
3607         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3608                 if (!err)
3609                         err = -EFAULT;
3610         }
3611 
3612         kfree(oparams);
3613 out:
3614         kfree(params);
3615         return err;
3616 }
3617 
3618 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3619                                       struct snd_pcm_hw_params_old __user * _oparams)
3620 {
3621         struct snd_pcm_hw_params *params;
3622         struct snd_pcm_hw_params_old *oparams = NULL;
3623         int err;
3624 
3625         params = kmalloc(sizeof(*params), GFP_KERNEL);
3626         if (!params)
3627                 return -ENOMEM;
3628 
3629         oparams = memdup_user(_oparams, sizeof(*oparams));
3630         if (IS_ERR(oparams)) {
3631                 err = PTR_ERR(oparams);
3632                 goto out;
3633         }
3634         snd_pcm_hw_convert_from_old_params(params, oparams);
3635         err = snd_pcm_hw_params(substream, params);
3636         snd_pcm_hw_convert_to_old_params(oparams, params);
3637         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3638                 if (!err)
3639                         err = -EFAULT;
3640         }
3641 
3642         kfree(oparams);
3643 out:
3644         kfree(params);
3645         return err;
3646 }
3647 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3648 
3649 #ifndef CONFIG_MMU
3650 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3651                                                unsigned long addr,
3652                                                unsigned long len,
3653                                                unsigned long pgoff,
3654                                                unsigned long flags)
3655 {
3656         struct snd_pcm_file *pcm_file = file->private_data;
3657         struct snd_pcm_substream *substream = pcm_file->substream;
3658         struct snd_pcm_runtime *runtime = substream->runtime;
3659         unsigned long offset = pgoff << PAGE_SHIFT;
3660 
3661         switch (offset) {
3662         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3663                 return (unsigned long)runtime->status;
3664         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3665                 return (unsigned long)runtime->control;
3666         default:
3667                 return (unsigned long)runtime->dma_area + offset;
3668         }
3669 }
3670 #else
3671 # define snd_pcm_get_unmapped_area NULL
3672 #endif
3673 
3674 /*
3675  *  Register section
3676  */
3677 
3678 const struct file_operations snd_pcm_f_ops[2] = {
3679         {
3680                 .owner =                THIS_MODULE,
3681                 .write =                snd_pcm_write,
3682                 .write_iter =           snd_pcm_writev,
3683                 .open =                 snd_pcm_playback_open,
3684                 .release =              snd_pcm_release,
3685                 .llseek =               no_llseek,
3686                 .poll =                 snd_pcm_playback_poll,
3687                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3688                 .compat_ioctl =         snd_pcm_ioctl_compat,
3689                 .mmap =                 snd_pcm_mmap,
3690                 .fasync =               snd_pcm_fasync,
3691                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3692         },
3693         {
3694                 .owner =                THIS_MODULE,
3695                 .read =                 snd_pcm_read,
3696                 .read_iter =            snd_pcm_readv,
3697                 .open =                 snd_pcm_capture_open,
3698                 .release =              snd_pcm_release,
3699                 .llseek =               no_llseek,
3700                 .poll =                 snd_pcm_capture_poll,
3701                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3702                 .compat_ioctl =         snd_pcm_ioctl_compat,
3703                 .mmap =                 snd_pcm_mmap,
3704                 .fasync =               snd_pcm_fasync,
3705                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3706         }
3707 };
3708 

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