ALSA: remove unneeded power_mutex lock in snd_pcm_drop
[linux-2.6.git] / sound / core / pcm_native.c
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/file.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos_params.h>
28 #include <linux/uio.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37
38 /*
39  *  Compatibility
40  */
41
42 struct snd_pcm_hw_params_old {
43         unsigned int flags;
44         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
45                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
46         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
47                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
48         unsigned int rmask;
49         unsigned int cmask;
50         unsigned int info;
51         unsigned int msbits;
52         unsigned int rate_num;
53         unsigned int rate_den;
54         snd_pcm_uframes_t fifo_size;
55         unsigned char reserved[64];
56 };
57
58 #ifdef CONFIG_SND_SUPPORT_OLD_API
59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
61
62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
63                                       struct snd_pcm_hw_params_old __user * _oparams);
64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
65                                       struct snd_pcm_hw_params_old __user * _oparams);
66 #endif
67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
68
69 /*
70  *
71  */
72
73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
75
76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
77
78 static inline mm_segment_t snd_enter_user(void)
79 {
80         mm_segment_t fs = get_fs();
81         set_fs(get_ds());
82         return fs;
83 }
84
85 static inline void snd_leave_user(mm_segment_t fs)
86 {
87         set_fs(fs);
88 }
89
90
91
92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
93 {
94         struct snd_pcm_runtime *runtime;
95         struct snd_pcm *pcm = substream->pcm;
96         struct snd_pcm_str *pstr = substream->pstr;
97
98         snd_assert(substream != NULL, return -ENXIO);
99         memset(info, 0, sizeof(*info));
100         info->card = pcm->card->number;
101         info->device = pcm->device;
102         info->stream = substream->stream;
103         info->subdevice = substream->number;
104         strlcpy(info->id, pcm->id, sizeof(info->id));
105         strlcpy(info->name, pcm->name, sizeof(info->name));
106         info->dev_class = pcm->dev_class;
107         info->dev_subclass = pcm->dev_subclass;
108         info->subdevices_count = pstr->substream_count;
109         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
110         strlcpy(info->subname, substream->name, sizeof(info->subname));
111         runtime = substream->runtime;
112         /* AB: FIXME!!! This is definitely nonsense */
113         if (runtime) {
114                 info->sync = runtime->sync;
115                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
116         }
117         return 0;
118 }
119
120 int snd_pcm_info_user(struct snd_pcm_substream *substream,
121                       struct snd_pcm_info __user * _info)
122 {
123         struct snd_pcm_info *info;
124         int err;
125
126         info = kmalloc(sizeof(*info), GFP_KERNEL);
127         if (! info)
128                 return -ENOMEM;
129         err = snd_pcm_info(substream, info);
130         if (err >= 0) {
131                 if (copy_to_user(_info, info, sizeof(*info)))
132                         err = -EFAULT;
133         }
134         kfree(info);
135         return err;
136 }
137
138 #undef RULES_DEBUG
139
140 #ifdef RULES_DEBUG
141 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
142 char *snd_pcm_hw_param_names[] = {
143         HW_PARAM(ACCESS),
144         HW_PARAM(FORMAT),
145         HW_PARAM(SUBFORMAT),
146         HW_PARAM(SAMPLE_BITS),
147         HW_PARAM(FRAME_BITS),
148         HW_PARAM(CHANNELS),
149         HW_PARAM(RATE),
150         HW_PARAM(PERIOD_TIME),
151         HW_PARAM(PERIOD_SIZE),
152         HW_PARAM(PERIOD_BYTES),
153         HW_PARAM(PERIODS),
154         HW_PARAM(BUFFER_TIME),
155         HW_PARAM(BUFFER_SIZE),
156         HW_PARAM(BUFFER_BYTES),
157         HW_PARAM(TICK_TIME),
158 };
159 #endif
160
161 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
162                       struct snd_pcm_hw_params *params)
163 {
164         unsigned int k;
165         struct snd_pcm_hardware *hw;
166         struct snd_interval *i = NULL;
167         struct snd_mask *m = NULL;
168         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
169         unsigned int rstamps[constrs->rules_num];
170         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
171         unsigned int stamp = 2;
172         int changed, again;
173
174         params->info = 0;
175         params->fifo_size = 0;
176         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
177                 params->msbits = 0;
178         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
179                 params->rate_num = 0;
180                 params->rate_den = 0;
181         }
182
183         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
184                 m = hw_param_mask(params, k);
185                 if (snd_mask_empty(m))
186                         return -EINVAL;
187                 if (!(params->rmask & (1 << k)))
188                         continue;
189 #ifdef RULES_DEBUG
190                 printk("%s = ", snd_pcm_hw_param_names[k]);
191                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
192 #endif
193                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
194 #ifdef RULES_DEBUG
195                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
196 #endif
197                 if (changed)
198                         params->cmask |= 1 << k;
199                 if (changed < 0)
200                         return changed;
201         }
202
203         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
204                 i = hw_param_interval(params, k);
205                 if (snd_interval_empty(i))
206                         return -EINVAL;
207                 if (!(params->rmask & (1 << k)))
208                         continue;
209 #ifdef RULES_DEBUG
210                 printk("%s = ", snd_pcm_hw_param_names[k]);
211                 if (i->empty)
212                         printk("empty");
213                 else
214                         printk("%c%u %u%c", 
215                                i->openmin ? '(' : '[', i->min,
216                                i->max, i->openmax ? ')' : ']');
217                 printk(" -> ");
218 #endif
219                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
220 #ifdef RULES_DEBUG
221                 if (i->empty)
222                         printk("empty\n");
223                 else 
224                         printk("%c%u %u%c\n", 
225                                i->openmin ? '(' : '[', i->min,
226                                i->max, i->openmax ? ')' : ']');
227 #endif
228                 if (changed)
229                         params->cmask |= 1 << k;
230                 if (changed < 0)
231                         return changed;
232         }
233
234         for (k = 0; k < constrs->rules_num; k++)
235                 rstamps[k] = 0;
236         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
237                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
238         do {
239                 again = 0;
240                 for (k = 0; k < constrs->rules_num; k++) {
241                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
242                         unsigned int d;
243                         int doit = 0;
244                         if (r->cond && !(r->cond & params->flags))
245                                 continue;
246                         for (d = 0; r->deps[d] >= 0; d++) {
247                                 if (vstamps[r->deps[d]] > rstamps[k]) {
248                                         doit = 1;
249                                         break;
250                                 }
251                         }
252                         if (!doit)
253                                 continue;
254 #ifdef RULES_DEBUG
255                         printk("Rule %d [%p]: ", k, r->func);
256                         if (r->var >= 0) {
257                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
258                                 if (hw_is_mask(r->var)) {
259                                         m = hw_param_mask(params, r->var);
260                                         printk("%x", *m->bits);
261                                 } else {
262                                         i = hw_param_interval(params, r->var);
263                                         if (i->empty)
264                                                 printk("empty");
265                                         else
266                                                 printk("%c%u %u%c", 
267                                                        i->openmin ? '(' : '[', i->min,
268                                                        i->max, i->openmax ? ')' : ']');
269                                 }
270                         }
271 #endif
272                         changed = r->func(params, r);
273 #ifdef RULES_DEBUG
274                         if (r->var >= 0) {
275                                 printk(" -> ");
276                                 if (hw_is_mask(r->var))
277                                         printk("%x", *m->bits);
278                                 else {
279                                         if (i->empty)
280                                                 printk("empty");
281                                         else
282                                                 printk("%c%u %u%c", 
283                                                        i->openmin ? '(' : '[', i->min,
284                                                        i->max, i->openmax ? ')' : ']');
285                                 }
286                         }
287                         printk("\n");
288 #endif
289                         rstamps[k] = stamp;
290                         if (changed && r->var >= 0) {
291                                 params->cmask |= (1 << r->var);
292                                 vstamps[r->var] = stamp;
293                                 again = 1;
294                         }
295                         if (changed < 0)
296                                 return changed;
297                         stamp++;
298                 }
299         } while (again);
300         if (!params->msbits) {
301                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
302                 if (snd_interval_single(i))
303                         params->msbits = snd_interval_value(i);
304         }
305
306         if (!params->rate_den) {
307                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
308                 if (snd_interval_single(i)) {
309                         params->rate_num = snd_interval_value(i);
310                         params->rate_den = 1;
311                 }
312         }
313
314         hw = &substream->runtime->hw;
315         if (!params->info)
316                 params->info = hw->info;
317         if (!params->fifo_size)
318                 params->fifo_size = hw->fifo_size;
319         params->rmask = 0;
320         return 0;
321 }
322
323 EXPORT_SYMBOL(snd_pcm_hw_refine);
324
325 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
326                                   struct snd_pcm_hw_params __user * _params)
327 {
328         struct snd_pcm_hw_params *params;
329         int err;
330
331         params = kmalloc(sizeof(*params), GFP_KERNEL);
332         if (!params) {
333                 err = -ENOMEM;
334                 goto out;
335         }
336         if (copy_from_user(params, _params, sizeof(*params))) {
337                 err = -EFAULT;
338                 goto out;
339         }
340         err = snd_pcm_hw_refine(substream, params);
341         if (copy_to_user(_params, params, sizeof(*params))) {
342                 if (!err)
343                         err = -EFAULT;
344         }
345 out:
346         kfree(params);
347         return err;
348 }
349
350 static int period_to_usecs(struct snd_pcm_runtime *runtime)
351 {
352         int usecs;
353
354         if (! runtime->rate)
355                 return -1; /* invalid */
356
357         /* take 75% of period time as the deadline */
358         usecs = (750000 / runtime->rate) * runtime->period_size;
359         usecs += ((750000 % runtime->rate) * runtime->period_size) /
360                 runtime->rate;
361
362         return usecs;
363 }
364
365 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
366                              struct snd_pcm_hw_params *params)
367 {
368         struct snd_pcm_runtime *runtime;
369         int err, usecs;
370         unsigned int bits;
371         snd_pcm_uframes_t frames;
372
373         snd_assert(substream != NULL, return -ENXIO);
374         runtime = substream->runtime;
375         snd_assert(runtime != NULL, return -ENXIO);
376         snd_pcm_stream_lock_irq(substream);
377         switch (runtime->status->state) {
378         case SNDRV_PCM_STATE_OPEN:
379         case SNDRV_PCM_STATE_SETUP:
380         case SNDRV_PCM_STATE_PREPARED:
381                 break;
382         default:
383                 snd_pcm_stream_unlock_irq(substream);
384                 return -EBADFD;
385         }
386         snd_pcm_stream_unlock_irq(substream);
387 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
388         if (!substream->oss.oss)
389 #endif
390                 if (atomic_read(&substream->mmap_count))
391                         return -EBADFD;
392
393         params->rmask = ~0U;
394         err = snd_pcm_hw_refine(substream, params);
395         if (err < 0)
396                 goto _error;
397
398         err = snd_pcm_hw_params_choose(substream, params);
399         if (err < 0)
400                 goto _error;
401
402         if (substream->ops->hw_params != NULL) {
403                 err = substream->ops->hw_params(substream, params);
404                 if (err < 0)
405                         goto _error;
406         }
407
408         runtime->access = params_access(params);
409         runtime->format = params_format(params);
410         runtime->subformat = params_subformat(params);
411         runtime->channels = params_channels(params);
412         runtime->rate = params_rate(params);
413         runtime->period_size = params_period_size(params);
414         runtime->periods = params_periods(params);
415         runtime->buffer_size = params_buffer_size(params);
416         runtime->info = params->info;
417         runtime->rate_num = params->rate_num;
418         runtime->rate_den = params->rate_den;
419
420         bits = snd_pcm_format_physical_width(runtime->format);
421         runtime->sample_bits = bits;
422         bits *= runtime->channels;
423         runtime->frame_bits = bits;
424         frames = 1;
425         while (bits % 8 != 0) {
426                 bits *= 2;
427                 frames *= 2;
428         }
429         runtime->byte_align = bits / 8;
430         runtime->min_align = frames;
431
432         /* Default sw params */
433         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
434         runtime->period_step = 1;
435         runtime->control->avail_min = runtime->period_size;
436         runtime->start_threshold = 1;
437         runtime->stop_threshold = runtime->buffer_size;
438         runtime->silence_threshold = 0;
439         runtime->silence_size = 0;
440         runtime->boundary = runtime->buffer_size;
441         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
442                 runtime->boundary *= 2;
443
444         snd_pcm_timer_resolution_change(substream);
445         runtime->status->state = SNDRV_PCM_STATE_SETUP;
446
447         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
448                                 substream->latency_id);
449         if ((usecs = period_to_usecs(runtime)) >= 0)
450                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
451                                         substream->latency_id, usecs);
452         return 0;
453  _error:
454         /* hardware might be unuseable from this time,
455            so we force application to retry to set
456            the correct hardware parameter settings */
457         runtime->status->state = SNDRV_PCM_STATE_OPEN;
458         if (substream->ops->hw_free != NULL)
459                 substream->ops->hw_free(substream);
460         return err;
461 }
462
463 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
464                                   struct snd_pcm_hw_params __user * _params)
465 {
466         struct snd_pcm_hw_params *params;
467         int err;
468
469         params = kmalloc(sizeof(*params), GFP_KERNEL);
470         if (!params) {
471                 err = -ENOMEM;
472                 goto out;
473         }
474         if (copy_from_user(params, _params, sizeof(*params))) {
475                 err = -EFAULT;
476                 goto out;
477         }
478         err = snd_pcm_hw_params(substream, params);
479         if (copy_to_user(_params, params, sizeof(*params))) {
480                 if (!err)
481                         err = -EFAULT;
482         }
483 out:
484         kfree(params);
485         return err;
486 }
487
488 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
489 {
490         struct snd_pcm_runtime *runtime;
491         int result = 0;
492
493         snd_assert(substream != NULL, return -ENXIO);
494         runtime = substream->runtime;
495         snd_assert(runtime != NULL, return -ENXIO);
496         snd_pcm_stream_lock_irq(substream);
497         switch (runtime->status->state) {
498         case SNDRV_PCM_STATE_SETUP:
499         case SNDRV_PCM_STATE_PREPARED:
500                 break;
501         default:
502                 snd_pcm_stream_unlock_irq(substream);
503                 return -EBADFD;
504         }
505         snd_pcm_stream_unlock_irq(substream);
506         if (atomic_read(&substream->mmap_count))
507                 return -EBADFD;
508         if (substream->ops->hw_free)
509                 result = substream->ops->hw_free(substream);
510         runtime->status->state = SNDRV_PCM_STATE_OPEN;
511         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
512                 substream->latency_id);
513         return result;
514 }
515
516 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
517                              struct snd_pcm_sw_params *params)
518 {
519         struct snd_pcm_runtime *runtime;
520
521         snd_assert(substream != NULL, return -ENXIO);
522         runtime = substream->runtime;
523         snd_assert(runtime != NULL, return -ENXIO);
524         snd_pcm_stream_lock_irq(substream);
525         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
526                 snd_pcm_stream_unlock_irq(substream);
527                 return -EBADFD;
528         }
529         snd_pcm_stream_unlock_irq(substream);
530
531         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
532                 return -EINVAL;
533         if (params->avail_min == 0)
534                 return -EINVAL;
535         if (params->silence_size >= runtime->boundary) {
536                 if (params->silence_threshold != 0)
537                         return -EINVAL;
538         } else {
539                 if (params->silence_size > params->silence_threshold)
540                         return -EINVAL;
541                 if (params->silence_threshold > runtime->buffer_size)
542                         return -EINVAL;
543         }
544         snd_pcm_stream_lock_irq(substream);
545         runtime->tstamp_mode = params->tstamp_mode;
546         runtime->period_step = params->period_step;
547         runtime->control->avail_min = params->avail_min;
548         runtime->start_threshold = params->start_threshold;
549         runtime->stop_threshold = params->stop_threshold;
550         runtime->silence_threshold = params->silence_threshold;
551         runtime->silence_size = params->silence_size;
552         params->boundary = runtime->boundary;
553         if (snd_pcm_running(substream)) {
554                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
555                     runtime->silence_size > 0)
556                         snd_pcm_playback_silence(substream, ULONG_MAX);
557                 wake_up(&runtime->sleep);
558         }
559         snd_pcm_stream_unlock_irq(substream);
560         return 0;
561 }
562
563 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
564                                   struct snd_pcm_sw_params __user * _params)
565 {
566         struct snd_pcm_sw_params params;
567         int err;
568         if (copy_from_user(&params, _params, sizeof(params)))
569                 return -EFAULT;
570         err = snd_pcm_sw_params(substream, &params);
571         if (copy_to_user(_params, &params, sizeof(params)))
572                 return -EFAULT;
573         return err;
574 }
575
576 int snd_pcm_status(struct snd_pcm_substream *substream,
577                    struct snd_pcm_status *status)
578 {
579         struct snd_pcm_runtime *runtime = substream->runtime;
580
581         snd_pcm_stream_lock_irq(substream);
582         status->state = runtime->status->state;
583         status->suspended_state = runtime->status->suspended_state;
584         if (status->state == SNDRV_PCM_STATE_OPEN)
585                 goto _end;
586         status->trigger_tstamp = runtime->trigger_tstamp;
587         if (snd_pcm_running(substream)) {
588                 snd_pcm_update_hw_ptr(substream);
589                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
590                         status->tstamp = runtime->status->tstamp;
591                         goto _tstamp_end;
592                 }
593         }
594         snd_pcm_gettime(runtime, &status->tstamp);
595  _tstamp_end:
596         status->appl_ptr = runtime->control->appl_ptr;
597         status->hw_ptr = runtime->status->hw_ptr;
598         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
599                 status->avail = snd_pcm_playback_avail(runtime);
600                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
601                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
602                         status->delay = runtime->buffer_size - status->avail;
603                 else
604                         status->delay = 0;
605         } else {
606                 status->avail = snd_pcm_capture_avail(runtime);
607                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
608                         status->delay = status->avail;
609                 else
610                         status->delay = 0;
611         }
612         status->avail_max = runtime->avail_max;
613         status->overrange = runtime->overrange;
614         runtime->avail_max = 0;
615         runtime->overrange = 0;
616  _end:
617         snd_pcm_stream_unlock_irq(substream);
618         return 0;
619 }
620
621 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
622                                struct snd_pcm_status __user * _status)
623 {
624         struct snd_pcm_status status;
625         struct snd_pcm_runtime *runtime;
626         int res;
627         
628         snd_assert(substream != NULL, return -ENXIO);
629         runtime = substream->runtime;
630         memset(&status, 0, sizeof(status));
631         res = snd_pcm_status(substream, &status);
632         if (res < 0)
633                 return res;
634         if (copy_to_user(_status, &status, sizeof(status)))
635                 return -EFAULT;
636         return 0;
637 }
638
639 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
640                                 struct snd_pcm_channel_info * info)
641 {
642         struct snd_pcm_runtime *runtime;
643         unsigned int channel;
644         
645         snd_assert(substream != NULL, return -ENXIO);
646         channel = info->channel;
647         runtime = substream->runtime;
648         snd_pcm_stream_lock_irq(substream);
649         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
650                 snd_pcm_stream_unlock_irq(substream);
651                 return -EBADFD;
652         }
653         snd_pcm_stream_unlock_irq(substream);
654         if (channel >= runtime->channels)
655                 return -EINVAL;
656         memset(info, 0, sizeof(*info));
657         info->channel = channel;
658         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
659 }
660
661 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
662                                      struct snd_pcm_channel_info __user * _info)
663 {
664         struct snd_pcm_channel_info info;
665         int res;
666         
667         if (copy_from_user(&info, _info, sizeof(info)))
668                 return -EFAULT;
669         res = snd_pcm_channel_info(substream, &info);
670         if (res < 0)
671                 return res;
672         if (copy_to_user(_info, &info, sizeof(info)))
673                 return -EFAULT;
674         return 0;
675 }
676
677 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
678 {
679         struct snd_pcm_runtime *runtime = substream->runtime;
680         if (runtime->trigger_master == NULL)
681                 return;
682         if (runtime->trigger_master == substream) {
683                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
684         } else {
685                 snd_pcm_trigger_tstamp(runtime->trigger_master);
686                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
687         }
688         runtime->trigger_master = NULL;
689 }
690
691 struct action_ops {
692         int (*pre_action)(struct snd_pcm_substream *substream, int state);
693         int (*do_action)(struct snd_pcm_substream *substream, int state);
694         void (*undo_action)(struct snd_pcm_substream *substream, int state);
695         void (*post_action)(struct snd_pcm_substream *substream, int state);
696 };
697
698 /*
699  *  this functions is core for handling of linked stream
700  *  Note: the stream state might be changed also on failure
701  *  Note2: call with calling stream lock + link lock
702  */
703 static int snd_pcm_action_group(struct action_ops *ops,
704                                 struct snd_pcm_substream *substream,
705                                 int state, int do_lock)
706 {
707         struct snd_pcm_substream *s = NULL;
708         struct snd_pcm_substream *s1;
709         int res = 0;
710
711         snd_pcm_group_for_each_entry(s, substream) {
712                 if (do_lock && s != substream)
713                         spin_lock_nested(&s->self_group.lock,
714                                          SINGLE_DEPTH_NESTING);
715                 res = ops->pre_action(s, state);
716                 if (res < 0)
717                         goto _unlock;
718         }
719         snd_pcm_group_for_each_entry(s, substream) {
720                 res = ops->do_action(s, state);
721                 if (res < 0) {
722                         if (ops->undo_action) {
723                                 snd_pcm_group_for_each_entry(s1, substream) {
724                                         if (s1 == s) /* failed stream */
725                                                 break;
726                                         ops->undo_action(s1, state);
727                                 }
728                         }
729                         s = NULL; /* unlock all */
730                         goto _unlock;
731                 }
732         }
733         snd_pcm_group_for_each_entry(s, substream) {
734                 ops->post_action(s, state);
735         }
736  _unlock:
737         if (do_lock) {
738                 /* unlock streams */
739                 snd_pcm_group_for_each_entry(s1, substream) {
740                         if (s1 != substream)
741                                 spin_unlock(&s1->self_group.lock);
742                         if (s1 == s)    /* end */
743                                 break;
744                 }
745         }
746         return res;
747 }
748
749 /*
750  *  Note: call with stream lock
751  */
752 static int snd_pcm_action_single(struct action_ops *ops,
753                                  struct snd_pcm_substream *substream,
754                                  int state)
755 {
756         int res;
757         
758         res = ops->pre_action(substream, state);
759         if (res < 0)
760                 return res;
761         res = ops->do_action(substream, state);
762         if (res == 0)
763                 ops->post_action(substream, state);
764         else if (ops->undo_action)
765                 ops->undo_action(substream, state);
766         return res;
767 }
768
769 /*
770  *  Note: call with stream lock
771  */
772 static int snd_pcm_action(struct action_ops *ops,
773                           struct snd_pcm_substream *substream,
774                           int state)
775 {
776         int res;
777
778         if (snd_pcm_stream_linked(substream)) {
779                 if (!spin_trylock(&substream->group->lock)) {
780                         spin_unlock(&substream->self_group.lock);
781                         spin_lock(&substream->group->lock);
782                         spin_lock(&substream->self_group.lock);
783                 }
784                 res = snd_pcm_action_group(ops, substream, state, 1);
785                 spin_unlock(&substream->group->lock);
786         } else {
787                 res = snd_pcm_action_single(ops, substream, state);
788         }
789         return res;
790 }
791
792 /*
793  *  Note: don't use any locks before
794  */
795 static int snd_pcm_action_lock_irq(struct action_ops *ops,
796                                    struct snd_pcm_substream *substream,
797                                    int state)
798 {
799         int res;
800
801         read_lock_irq(&snd_pcm_link_rwlock);
802         if (snd_pcm_stream_linked(substream)) {
803                 spin_lock(&substream->group->lock);
804                 spin_lock(&substream->self_group.lock);
805                 res = snd_pcm_action_group(ops, substream, state, 1);
806                 spin_unlock(&substream->self_group.lock);
807                 spin_unlock(&substream->group->lock);
808         } else {
809                 spin_lock(&substream->self_group.lock);
810                 res = snd_pcm_action_single(ops, substream, state);
811                 spin_unlock(&substream->self_group.lock);
812         }
813         read_unlock_irq(&snd_pcm_link_rwlock);
814         return res;
815 }
816
817 /*
818  */
819 static int snd_pcm_action_nonatomic(struct action_ops *ops,
820                                     struct snd_pcm_substream *substream,
821                                     int state)
822 {
823         int res;
824
825         down_read(&snd_pcm_link_rwsem);
826         if (snd_pcm_stream_linked(substream))
827                 res = snd_pcm_action_group(ops, substream, state, 0);
828         else
829                 res = snd_pcm_action_single(ops, substream, state);
830         up_read(&snd_pcm_link_rwsem);
831         return res;
832 }
833
834 /*
835  * start callbacks
836  */
837 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
838 {
839         struct snd_pcm_runtime *runtime = substream->runtime;
840         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
841                 return -EBADFD;
842         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
843             !snd_pcm_playback_data(substream))
844                 return -EPIPE;
845         runtime->trigger_master = substream;
846         return 0;
847 }
848
849 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
850 {
851         if (substream->runtime->trigger_master != substream)
852                 return 0;
853         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
854 }
855
856 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
857 {
858         if (substream->runtime->trigger_master == substream)
859                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
860 }
861
862 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
863 {
864         struct snd_pcm_runtime *runtime = substream->runtime;
865         snd_pcm_trigger_tstamp(substream);
866         runtime->status->state = state;
867         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
868             runtime->silence_size > 0)
869                 snd_pcm_playback_silence(substream, ULONG_MAX);
870         if (substream->timer)
871                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
872                                  &runtime->trigger_tstamp);
873 }
874
875 static struct action_ops snd_pcm_action_start = {
876         .pre_action = snd_pcm_pre_start,
877         .do_action = snd_pcm_do_start,
878         .undo_action = snd_pcm_undo_start,
879         .post_action = snd_pcm_post_start
880 };
881
882 /**
883  * snd_pcm_start
884  * @substream: the PCM substream instance
885  *
886  * Start all linked streams.
887  */
888 int snd_pcm_start(struct snd_pcm_substream *substream)
889 {
890         return snd_pcm_action(&snd_pcm_action_start, substream,
891                               SNDRV_PCM_STATE_RUNNING);
892 }
893
894 /*
895  * stop callbacks
896  */
897 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
898 {
899         struct snd_pcm_runtime *runtime = substream->runtime;
900         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
901                 return -EBADFD;
902         runtime->trigger_master = substream;
903         return 0;
904 }
905
906 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
907 {
908         if (substream->runtime->trigger_master == substream &&
909             snd_pcm_running(substream))
910                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
911         return 0; /* unconditonally stop all substreams */
912 }
913
914 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
915 {
916         struct snd_pcm_runtime *runtime = substream->runtime;
917         if (runtime->status->state != state) {
918                 snd_pcm_trigger_tstamp(substream);
919                 if (substream->timer)
920                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
921                                          &runtime->trigger_tstamp);
922                 runtime->status->state = state;
923         }
924         wake_up(&runtime->sleep);
925 }
926
927 static struct action_ops snd_pcm_action_stop = {
928         .pre_action = snd_pcm_pre_stop,
929         .do_action = snd_pcm_do_stop,
930         .post_action = snd_pcm_post_stop
931 };
932
933 /**
934  * snd_pcm_stop
935  * @substream: the PCM substream instance
936  * @state: PCM state after stopping the stream
937  *
938  * Try to stop all running streams in the substream group.
939  * The state of each stream is changed to the given value after that unconditionally.
940  */
941 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
942 {
943         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
944 }
945
946 EXPORT_SYMBOL(snd_pcm_stop);
947
948 /**
949  * snd_pcm_drain_done
950  * @substream: the PCM substream
951  *
952  * Stop the DMA only when the given stream is playback.
953  * The state is changed to SETUP.
954  * Unlike snd_pcm_stop(), this affects only the given stream.
955  */
956 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
957 {
958         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
959                                      SNDRV_PCM_STATE_SETUP);
960 }
961
962 /*
963  * pause callbacks
964  */
965 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
966 {
967         struct snd_pcm_runtime *runtime = substream->runtime;
968         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
969                 return -ENOSYS;
970         if (push) {
971                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
972                         return -EBADFD;
973         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
974                 return -EBADFD;
975         runtime->trigger_master = substream;
976         return 0;
977 }
978
979 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
980 {
981         if (substream->runtime->trigger_master != substream)
982                 return 0;
983         return substream->ops->trigger(substream,
984                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
985                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
986 }
987
988 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
989 {
990         if (substream->runtime->trigger_master == substream)
991                 substream->ops->trigger(substream,
992                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
993                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
994 }
995
996 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
997 {
998         struct snd_pcm_runtime *runtime = substream->runtime;
999         snd_pcm_trigger_tstamp(substream);
1000         if (push) {
1001                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1002                 if (substream->timer)
1003                         snd_timer_notify(substream->timer,
1004                                          SNDRV_TIMER_EVENT_MPAUSE,
1005                                          &runtime->trigger_tstamp);
1006                 wake_up(&runtime->sleep);
1007         } else {
1008                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1009                 if (substream->timer)
1010                         snd_timer_notify(substream->timer,
1011                                          SNDRV_TIMER_EVENT_MCONTINUE,
1012                                          &runtime->trigger_tstamp);
1013         }
1014 }
1015
1016 static struct action_ops snd_pcm_action_pause = {
1017         .pre_action = snd_pcm_pre_pause,
1018         .do_action = snd_pcm_do_pause,
1019         .undo_action = snd_pcm_undo_pause,
1020         .post_action = snd_pcm_post_pause
1021 };
1022
1023 /*
1024  * Push/release the pause for all linked streams.
1025  */
1026 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1027 {
1028         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1029 }
1030
1031 #ifdef CONFIG_PM
1032 /* suspend */
1033
1034 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1035 {
1036         struct snd_pcm_runtime *runtime = substream->runtime;
1037         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1038                 return -EBUSY;
1039         runtime->trigger_master = substream;
1040         return 0;
1041 }
1042
1043 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1044 {
1045         struct snd_pcm_runtime *runtime = substream->runtime;
1046         if (runtime->trigger_master != substream)
1047                 return 0;
1048         if (! snd_pcm_running(substream))
1049                 return 0;
1050         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1051         return 0; /* suspend unconditionally */
1052 }
1053
1054 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1055 {
1056         struct snd_pcm_runtime *runtime = substream->runtime;
1057         snd_pcm_trigger_tstamp(substream);
1058         if (substream->timer)
1059                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1060                                  &runtime->trigger_tstamp);
1061         runtime->status->suspended_state = runtime->status->state;
1062         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1063         wake_up(&runtime->sleep);
1064 }
1065
1066 static struct action_ops snd_pcm_action_suspend = {
1067         .pre_action = snd_pcm_pre_suspend,
1068         .do_action = snd_pcm_do_suspend,
1069         .post_action = snd_pcm_post_suspend
1070 };
1071
1072 /**
1073  * snd_pcm_suspend
1074  * @substream: the PCM substream
1075  *
1076  * Trigger SUSPEND to all linked streams.
1077  * After this call, all streams are changed to SUSPENDED state.
1078  */
1079 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1080 {
1081         int err;
1082         unsigned long flags;
1083
1084         if (! substream)
1085                 return 0;
1086
1087         snd_pcm_stream_lock_irqsave(substream, flags);
1088         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1089         snd_pcm_stream_unlock_irqrestore(substream, flags);
1090         return err;
1091 }
1092
1093 EXPORT_SYMBOL(snd_pcm_suspend);
1094
1095 /**
1096  * snd_pcm_suspend_all
1097  * @pcm: the PCM instance
1098  *
1099  * Trigger SUSPEND to all substreams in the given pcm.
1100  * After this call, all streams are changed to SUSPENDED state.
1101  */
1102 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1103 {
1104         struct snd_pcm_substream *substream;
1105         int stream, err = 0;
1106
1107         if (! pcm)
1108                 return 0;
1109
1110         for (stream = 0; stream < 2; stream++) {
1111                 for (substream = pcm->streams[stream].substream;
1112                      substream; substream = substream->next) {
1113                         /* FIXME: the open/close code should lock this as well */
1114                         if (substream->runtime == NULL)
1115                                 continue;
1116                         err = snd_pcm_suspend(substream);
1117                         if (err < 0 && err != -EBUSY)
1118                                 return err;
1119                 }
1120         }
1121         return 0;
1122 }
1123
1124 EXPORT_SYMBOL(snd_pcm_suspend_all);
1125
1126 /* resume */
1127
1128 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1129 {
1130         struct snd_pcm_runtime *runtime = substream->runtime;
1131         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1132                 return -ENOSYS;
1133         runtime->trigger_master = substream;
1134         return 0;
1135 }
1136
1137 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1138 {
1139         struct snd_pcm_runtime *runtime = substream->runtime;
1140         if (runtime->trigger_master != substream)
1141                 return 0;
1142         /* DMA not running previously? */
1143         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1144             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1145              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1146                 return 0;
1147         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1148 }
1149
1150 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1151 {
1152         if (substream->runtime->trigger_master == substream &&
1153             snd_pcm_running(substream))
1154                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1155 }
1156
1157 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1158 {
1159         struct snd_pcm_runtime *runtime = substream->runtime;
1160         snd_pcm_trigger_tstamp(substream);
1161         if (substream->timer)
1162                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1163                                  &runtime->trigger_tstamp);
1164         runtime->status->state = runtime->status->suspended_state;
1165 }
1166
1167 static struct action_ops snd_pcm_action_resume = {
1168         .pre_action = snd_pcm_pre_resume,
1169         .do_action = snd_pcm_do_resume,
1170         .undo_action = snd_pcm_undo_resume,
1171         .post_action = snd_pcm_post_resume
1172 };
1173
1174 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1175 {
1176         struct snd_card *card = substream->pcm->card;
1177         int res;
1178
1179         snd_power_lock(card);
1180         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1181                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1182         snd_power_unlock(card);
1183         return res;
1184 }
1185
1186 #else
1187
1188 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1189 {
1190         return -ENOSYS;
1191 }
1192
1193 #endif /* CONFIG_PM */
1194
1195 /*
1196  * xrun ioctl
1197  *
1198  * Change the RUNNING stream(s) to XRUN state.
1199  */
1200 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1201 {
1202         struct snd_card *card = substream->pcm->card;
1203         struct snd_pcm_runtime *runtime = substream->runtime;
1204         int result;
1205
1206         snd_power_lock(card);
1207         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1208                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1209                 if (result < 0)
1210                         goto _unlock;
1211         }
1212
1213         snd_pcm_stream_lock_irq(substream);
1214         switch (runtime->status->state) {
1215         case SNDRV_PCM_STATE_XRUN:
1216                 result = 0;     /* already there */
1217                 break;
1218         case SNDRV_PCM_STATE_RUNNING:
1219                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1220                 break;
1221         default:
1222                 result = -EBADFD;
1223         }
1224         snd_pcm_stream_unlock_irq(substream);
1225  _unlock:
1226         snd_power_unlock(card);
1227         return result;
1228 }
1229
1230 /*
1231  * reset ioctl
1232  */
1233 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1234 {
1235         struct snd_pcm_runtime *runtime = substream->runtime;
1236         switch (runtime->status->state) {
1237         case SNDRV_PCM_STATE_RUNNING:
1238         case SNDRV_PCM_STATE_PREPARED:
1239         case SNDRV_PCM_STATE_PAUSED:
1240         case SNDRV_PCM_STATE_SUSPENDED:
1241                 return 0;
1242         default:
1243                 return -EBADFD;
1244         }
1245 }
1246
1247 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1248 {
1249         struct snd_pcm_runtime *runtime = substream->runtime;
1250         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1251         if (err < 0)
1252                 return err;
1253         // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1254         runtime->hw_ptr_base = 0;
1255         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1256                 runtime->status->hw_ptr % runtime->period_size;
1257         runtime->silence_start = runtime->status->hw_ptr;
1258         runtime->silence_filled = 0;
1259         return 0;
1260 }
1261
1262 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1263 {
1264         struct snd_pcm_runtime *runtime = substream->runtime;
1265         runtime->control->appl_ptr = runtime->status->hw_ptr;
1266         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1267             runtime->silence_size > 0)
1268                 snd_pcm_playback_silence(substream, ULONG_MAX);
1269 }
1270
1271 static struct action_ops snd_pcm_action_reset = {
1272         .pre_action = snd_pcm_pre_reset,
1273         .do_action = snd_pcm_do_reset,
1274         .post_action = snd_pcm_post_reset
1275 };
1276
1277 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1278 {
1279         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1280 }
1281
1282 /*
1283  * prepare ioctl
1284  */
1285 /* we use the second argument for updating f_flags */
1286 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1287                                int f_flags)
1288 {
1289         struct snd_pcm_runtime *runtime = substream->runtime;
1290         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1291             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1292                 return -EBADFD;
1293         if (snd_pcm_running(substream))
1294                 return -EBUSY;
1295         substream->f_flags = f_flags;
1296         return 0;
1297 }
1298
1299 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1300 {
1301         int err;
1302         err = substream->ops->prepare(substream);
1303         if (err < 0)
1304                 return err;
1305         return snd_pcm_do_reset(substream, 0);
1306 }
1307
1308 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1309 {
1310         struct snd_pcm_runtime *runtime = substream->runtime;
1311         runtime->control->appl_ptr = runtime->status->hw_ptr;
1312         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1313 }
1314
1315 static struct action_ops snd_pcm_action_prepare = {
1316         .pre_action = snd_pcm_pre_prepare,
1317         .do_action = snd_pcm_do_prepare,
1318         .post_action = snd_pcm_post_prepare
1319 };
1320
1321 /**
1322  * snd_pcm_prepare
1323  * @substream: the PCM substream instance
1324  * @file: file to refer f_flags
1325  *
1326  * Prepare the PCM substream to be triggerable.
1327  */
1328 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1329                            struct file *file)
1330 {
1331         int res;
1332         struct snd_card *card = substream->pcm->card;
1333         int f_flags;
1334
1335         if (file)
1336                 f_flags = file->f_flags;
1337         else
1338                 f_flags = substream->f_flags;
1339
1340         snd_power_lock(card);
1341         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1342                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1343                                                substream, f_flags);
1344         snd_power_unlock(card);
1345         return res;
1346 }
1347
1348 /*
1349  * drain ioctl
1350  */
1351
1352 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1353 {
1354         if (substream->f_flags & O_NONBLOCK)
1355                 return -EAGAIN;
1356         substream->runtime->trigger_master = substream;
1357         return 0;
1358 }
1359
1360 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1361 {
1362         struct snd_pcm_runtime *runtime = substream->runtime;
1363         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1364                 switch (runtime->status->state) {
1365                 case SNDRV_PCM_STATE_PREPARED:
1366                         /* start playback stream if possible */
1367                         if (! snd_pcm_playback_empty(substream)) {
1368                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1369                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1370                         }
1371                         break;
1372                 case SNDRV_PCM_STATE_RUNNING:
1373                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1374                         break;
1375                 default:
1376                         break;
1377                 }
1378         } else {
1379                 /* stop running stream */
1380                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1381                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1382                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1383                         snd_pcm_do_stop(substream, new_state);
1384                         snd_pcm_post_stop(substream, new_state);
1385                 }
1386         }
1387         return 0;
1388 }
1389
1390 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1391 {
1392 }
1393
1394 static struct action_ops snd_pcm_action_drain_init = {
1395         .pre_action = snd_pcm_pre_drain_init,
1396         .do_action = snd_pcm_do_drain_init,
1397         .post_action = snd_pcm_post_drain_init
1398 };
1399
1400 struct drain_rec {
1401         struct snd_pcm_substream *substream;
1402         wait_queue_t wait;
1403         snd_pcm_uframes_t stop_threshold;
1404 };
1405
1406 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407
1408 /*
1409  * Drain the stream(s).
1410  * When the substream is linked, sync until the draining of all playback streams
1411  * is finished.
1412  * After this call, all streams are supposed to be either SETUP or DRAINING
1413  * (capture only) state.
1414  */
1415 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1416 {
1417         struct snd_card *card;
1418         struct snd_pcm_runtime *runtime;
1419         struct snd_pcm_substream *s;
1420         int result = 0;
1421         int i, num_drecs;
1422         struct drain_rec *drec, drec_tmp, *d;
1423
1424         snd_assert(substream != NULL, return -ENXIO);
1425         card = substream->pcm->card;
1426         runtime = substream->runtime;
1427
1428         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429                 return -EBADFD;
1430
1431         snd_power_lock(card);
1432         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434                 if (result < 0) {
1435                         snd_power_unlock(card);
1436                         return result;
1437                 }
1438         }
1439
1440         /* allocate temporary record for drain sync */
1441         down_read(&snd_pcm_link_rwsem);
1442         if (snd_pcm_stream_linked(substream)) {
1443                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1444                 if (! drec) {
1445                         up_read(&snd_pcm_link_rwsem);
1446                         snd_power_unlock(card);
1447                         return -ENOMEM;
1448                 }
1449         } else
1450                 drec = &drec_tmp;
1451
1452         /* count only playback streams */
1453         num_drecs = 0;
1454         snd_pcm_group_for_each_entry(s, substream) {
1455                 runtime = s->runtime;
1456                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1457                         d = &drec[num_drecs++];
1458                         d->substream = s;
1459                         init_waitqueue_entry(&d->wait, current);
1460                         add_wait_queue(&runtime->sleep, &d->wait);
1461                         /* stop_threshold fixup to avoid endless loop when
1462                          * stop_threshold > buffer_size
1463                          */
1464                         d->stop_threshold = runtime->stop_threshold;
1465                         if (runtime->stop_threshold > runtime->buffer_size)
1466                                 runtime->stop_threshold = runtime->buffer_size;
1467                 }
1468         }
1469         up_read(&snd_pcm_link_rwsem);
1470
1471         snd_pcm_stream_lock_irq(substream);
1472         /* resume pause */
1473         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1474                 snd_pcm_pause(substream, 0);
1475
1476         /* pre-start/stop - all running streams are changed to DRAINING state */
1477         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1478         if (result < 0) {
1479                 snd_pcm_stream_unlock_irq(substream);
1480                 goto _error;
1481         }
1482
1483         for (;;) {
1484                 long tout;
1485                 if (signal_pending(current)) {
1486                         result = -ERESTARTSYS;
1487                         break;
1488                 }
1489                 /* all finished? */
1490                 for (i = 0; i < num_drecs; i++) {
1491                         runtime = drec[i].substream->runtime;
1492                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1493                                 break;
1494                 }
1495                 if (i == num_drecs)
1496                         break; /* yes, all drained */
1497
1498                 set_current_state(TASK_INTERRUPTIBLE);
1499                 snd_pcm_stream_unlock_irq(substream);
1500                 snd_power_unlock(card);
1501                 tout = schedule_timeout(10 * HZ);
1502                 snd_power_lock(card);
1503                 snd_pcm_stream_lock_irq(substream);
1504                 if (tout == 0) {
1505                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1506                                 result = -ESTRPIPE;
1507                         else {
1508                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1509                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1510                                 result = -EIO;
1511                         }
1512                         break;
1513                 }
1514         }
1515
1516         snd_pcm_stream_unlock_irq(substream);
1517
1518  _error:
1519         for (i = 0; i < num_drecs; i++) {
1520                 d = &drec[i];
1521                 runtime = d->substream->runtime;
1522                 remove_wait_queue(&runtime->sleep, &d->wait);
1523                 runtime->stop_threshold = d->stop_threshold;
1524         }
1525
1526         if (drec != &drec_tmp)
1527                 kfree(drec);
1528         snd_power_unlock(card);
1529
1530         return result;
1531 }
1532
1533 /*
1534  * drop ioctl
1535  *
1536  * Immediately put all linked substreams into SETUP state.
1537  */
1538 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1539 {
1540         struct snd_pcm_runtime *runtime;
1541         struct snd_card *card;
1542         int result = 0;
1543         
1544         snd_assert(substream != NULL, return -ENXIO);
1545         runtime = substream->runtime;
1546         card = substream->pcm->card;
1547
1548         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1549             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1550             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1551                 return -EBADFD;
1552
1553         snd_pcm_stream_lock_irq(substream);
1554         /* resume pause */
1555         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1556                 snd_pcm_pause(substream, 0);
1557
1558         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1559         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1560         snd_pcm_stream_unlock_irq(substream);
1561
1562         return result;
1563 }
1564
1565
1566 /* WARNING: Don't forget to fput back the file */
1567 static struct file *snd_pcm_file_fd(int fd)
1568 {
1569         struct file *file;
1570         struct inode *inode;
1571         unsigned int minor;
1572
1573         file = fget(fd);
1574         if (!file)
1575                 return NULL;
1576         inode = file->f_path.dentry->d_inode;
1577         if (!S_ISCHR(inode->i_mode) ||
1578             imajor(inode) != snd_major) {
1579                 fput(file);
1580                 return NULL;
1581         }
1582         minor = iminor(inode);
1583         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1584             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1585                 fput(file);
1586                 return NULL;
1587         }
1588         return file;
1589 }
1590
1591 /*
1592  * PCM link handling
1593  */
1594 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1595 {
1596         int res = 0;
1597         struct file *file;
1598         struct snd_pcm_file *pcm_file;
1599         struct snd_pcm_substream *substream1;
1600
1601         file = snd_pcm_file_fd(fd);
1602         if (!file)
1603                 return -EBADFD;
1604         pcm_file = file->private_data;
1605         substream1 = pcm_file->substream;
1606         down_write(&snd_pcm_link_rwsem);
1607         write_lock_irq(&snd_pcm_link_rwlock);
1608         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1609             substream->runtime->status->state != substream1->runtime->status->state) {
1610                 res = -EBADFD;
1611                 goto _end;
1612         }
1613         if (snd_pcm_stream_linked(substream1)) {
1614                 res = -EALREADY;
1615                 goto _end;
1616         }
1617         if (!snd_pcm_stream_linked(substream)) {
1618                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1619                 if (substream->group == NULL) {
1620                         res = -ENOMEM;
1621                         goto _end;
1622                 }
1623                 spin_lock_init(&substream->group->lock);
1624                 INIT_LIST_HEAD(&substream->group->substreams);
1625                 list_add_tail(&substream->link_list, &substream->group->substreams);
1626                 substream->group->count = 1;
1627         }
1628         list_add_tail(&substream1->link_list, &substream->group->substreams);
1629         substream->group->count++;
1630         substream1->group = substream->group;
1631  _end:
1632         write_unlock_irq(&snd_pcm_link_rwlock);
1633         up_write(&snd_pcm_link_rwsem);
1634         fput(file);
1635         return res;
1636 }
1637
1638 static void relink_to_local(struct snd_pcm_substream *substream)
1639 {
1640         substream->group = &substream->self_group;
1641         INIT_LIST_HEAD(&substream->self_group.substreams);
1642         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1643 }
1644
1645 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1646 {
1647         struct snd_pcm_substream *s;
1648         int res = 0;
1649
1650         down_write(&snd_pcm_link_rwsem);
1651         write_lock_irq(&snd_pcm_link_rwlock);
1652         if (!snd_pcm_stream_linked(substream)) {
1653                 res = -EALREADY;
1654                 goto _end;
1655         }
1656         list_del(&substream->link_list);
1657         substream->group->count--;
1658         if (substream->group->count == 1) {     /* detach the last stream, too */
1659                 snd_pcm_group_for_each_entry(s, substream) {
1660                         relink_to_local(s);
1661                         break;
1662                 }
1663                 kfree(substream->group);
1664         }
1665         relink_to_local(substream);
1666        _end:
1667         write_unlock_irq(&snd_pcm_link_rwlock);
1668         up_write(&snd_pcm_link_rwsem);
1669         return res;
1670 }
1671
1672 /*
1673  * hw configurator
1674  */
1675 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1676                                struct snd_pcm_hw_rule *rule)
1677 {
1678         struct snd_interval t;
1679         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1680                      hw_param_interval_c(params, rule->deps[1]), &t);
1681         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1682 }
1683
1684 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1685                                struct snd_pcm_hw_rule *rule)
1686 {
1687         struct snd_interval t;
1688         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1689                      hw_param_interval_c(params, rule->deps[1]), &t);
1690         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1691 }
1692
1693 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1694                                    struct snd_pcm_hw_rule *rule)
1695 {
1696         struct snd_interval t;
1697         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1698                          hw_param_interval_c(params, rule->deps[1]),
1699                          (unsigned long) rule->private, &t);
1700         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1701 }
1702
1703 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1704                                    struct snd_pcm_hw_rule *rule)
1705 {
1706         struct snd_interval t;
1707         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1708                          (unsigned long) rule->private,
1709                          hw_param_interval_c(params, rule->deps[1]), &t);
1710         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1711 }
1712
1713 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1714                                   struct snd_pcm_hw_rule *rule)
1715 {
1716         unsigned int k;
1717         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1718         struct snd_mask m;
1719         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1720         snd_mask_any(&m);
1721         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1722                 int bits;
1723                 if (! snd_mask_test(mask, k))
1724                         continue;
1725                 bits = snd_pcm_format_physical_width(k);
1726                 if (bits <= 0)
1727                         continue; /* ignore invalid formats */
1728                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1729                         snd_mask_reset(&m, k);
1730         }
1731         return snd_mask_refine(mask, &m);
1732 }
1733
1734 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1735                                        struct snd_pcm_hw_rule *rule)
1736 {
1737         struct snd_interval t;
1738         unsigned int k;
1739         t.min = UINT_MAX;
1740         t.max = 0;
1741         t.openmin = 0;
1742         t.openmax = 0;
1743         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1744                 int bits;
1745                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1746                         continue;
1747                 bits = snd_pcm_format_physical_width(k);
1748                 if (bits <= 0)
1749                         continue; /* ignore invalid formats */
1750                 if (t.min > (unsigned)bits)
1751                         t.min = bits;
1752                 if (t.max < (unsigned)bits)
1753                         t.max = bits;
1754         }
1755         t.integer = 1;
1756         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1757 }
1758
1759 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1760 #error "Change this table"
1761 #endif
1762
1763 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1764                                  48000, 64000, 88200, 96000, 176400, 192000 };
1765
1766 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1767         .count = ARRAY_SIZE(rates),
1768         .list = rates,
1769 };
1770
1771 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1772                                 struct snd_pcm_hw_rule *rule)
1773 {
1774         struct snd_pcm_hardware *hw = rule->private;
1775         return snd_interval_list(hw_param_interval(params, rule->var),
1776                                  snd_pcm_known_rates.count,
1777                                  snd_pcm_known_rates.list, hw->rates);
1778 }               
1779
1780 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1781                                             struct snd_pcm_hw_rule *rule)
1782 {
1783         struct snd_interval t;
1784         struct snd_pcm_substream *substream = rule->private;
1785         t.min = 0;
1786         t.max = substream->buffer_bytes_max;
1787         t.openmin = 0;
1788         t.openmax = 0;
1789         t.integer = 1;
1790         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1791 }               
1792
1793 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1794 {
1795         struct snd_pcm_runtime *runtime = substream->runtime;
1796         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1797         int k, err;
1798
1799         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1800                 snd_mask_any(constrs_mask(constrs, k));
1801         }
1802
1803         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1804                 snd_interval_any(constrs_interval(constrs, k));
1805         }
1806
1807         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1808         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1809         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1810         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1811         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1812
1813         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1814                                    snd_pcm_hw_rule_format, NULL,
1815                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1816         if (err < 0)
1817                 return err;
1818         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
1819                                   snd_pcm_hw_rule_sample_bits, NULL,
1820                                   SNDRV_PCM_HW_PARAM_FORMAT, 
1821                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1822         if (err < 0)
1823                 return err;
1824         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
1825                                   snd_pcm_hw_rule_div, NULL,
1826                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1827         if (err < 0)
1828                 return err;
1829         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1830                                   snd_pcm_hw_rule_mul, NULL,
1831                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1832         if (err < 0)
1833                 return err;
1834         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1835                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1836                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1837         if (err < 0)
1838                 return err;
1839         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1840                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1841                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1842         if (err < 0)
1843                 return err;
1844         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
1845                                   snd_pcm_hw_rule_div, NULL,
1846                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1847         if (err < 0)
1848                 return err;
1849         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1850                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1851                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1852         if (err < 0)
1853                 return err;
1854         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1855                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1856                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1857         if (err < 0)
1858                 return err;
1859         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
1860                                   snd_pcm_hw_rule_div, NULL,
1861                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1862         if (err < 0)
1863                 return err;
1864         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1865                                   snd_pcm_hw_rule_div, NULL,
1866                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1867         if (err < 0)
1868                 return err;
1869         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1870                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1871                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1872         if (err < 0)
1873                 return err;
1874         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1875                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1876                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1877         if (err < 0)
1878                 return err;
1879         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1880                                   snd_pcm_hw_rule_mul, NULL,
1881                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1882         if (err < 0)
1883                 return err;
1884         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1885                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1886                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1887         if (err < 0)
1888                 return err;
1889         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1890                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1891                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1892         if (err < 0)
1893                 return err;
1894         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
1895                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1896                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1897         if (err < 0)
1898                 return err;
1899         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
1900                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1901                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1902         if (err < 0)
1903                 return err;
1904         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
1905                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1906                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1907         if (err < 0)
1908                 return err;
1909         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
1910                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1911                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1912         if (err < 0)
1913                 return err;
1914         return 0;
1915 }
1916
1917 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1918 {
1919         struct snd_pcm_runtime *runtime = substream->runtime;
1920         struct snd_pcm_hardware *hw = &runtime->hw;
1921         int err;
1922         unsigned int mask = 0;
1923
1924         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1925                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1926         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1927                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1928         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1929                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1930                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1931                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1932                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1933                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1934                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1935         }
1936         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1937         snd_assert(err >= 0, return -EINVAL);
1938
1939         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1940         snd_assert(err >= 0, return -EINVAL);
1941
1942         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1943         snd_assert(err >= 0, return -EINVAL);
1944
1945         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1946                                            hw->channels_min, hw->channels_max);
1947         snd_assert(err >= 0, return -EINVAL);
1948
1949         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1950                                            hw->rate_min, hw->rate_max);
1951         snd_assert(err >= 0, return -EINVAL);
1952
1953         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1954                                            hw->period_bytes_min, hw->period_bytes_max);
1955         snd_assert(err >= 0, return -EINVAL);
1956
1957         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1958                                            hw->periods_min, hw->periods_max);
1959         snd_assert(err >= 0, return -EINVAL);
1960
1961         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1962                                            hw->period_bytes_min, hw->buffer_bytes_max);
1963         snd_assert(err >= 0, return -EINVAL);
1964
1965         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
1966                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1967                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1968         if (err < 0)
1969                 return err;
1970
1971         /* FIXME: remove */
1972         if (runtime->dma_bytes) {
1973                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1974                 snd_assert(err >= 0, return -EINVAL);
1975         }
1976
1977         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1978                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1979                                           snd_pcm_hw_rule_rate, hw,
1980                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1981                 if (err < 0)
1982                         return err;
1983         }
1984
1985         /* FIXME: this belong to lowlevel */
1986         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1987
1988         return 0;
1989 }
1990
1991 static void pcm_release_private(struct snd_pcm_substream *substream)
1992 {
1993         snd_pcm_unlink(substream);
1994 }
1995
1996 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1997 {
1998         substream->ref_count--;
1999         if (substream->ref_count > 0)
2000                 return;
2001
2002         snd_pcm_drop(substream);
2003         if (substream->hw_opened) {
2004                 if (substream->ops->hw_free != NULL)
2005                         substream->ops->hw_free(substream);
2006                 substream->ops->close(substream);
2007                 substream->hw_opened = 0;
2008         }
2009         if (substream->pcm_release) {
2010                 substream->pcm_release(substream);
2011                 substream->pcm_release = NULL;
2012         }
2013         snd_pcm_detach_substream(substream);
2014 }
2015
2016 EXPORT_SYMBOL(snd_pcm_release_substream);
2017
2018 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2019                            struct file *file,
2020                            struct snd_pcm_substream **rsubstream)
2021 {
2022         struct snd_pcm_substream *substream;
2023         int err;
2024
2025         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2026         if (err < 0)
2027                 return err;
2028         if (substream->ref_count > 1) {
2029                 *rsubstream = substream;
2030                 return 0;
2031         }
2032
2033         err = snd_pcm_hw_constraints_init(substream);
2034         if (err < 0) {
2035                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2036                 goto error;
2037         }
2038
2039         if ((err = substream->ops->open(substream)) < 0)
2040                 goto error;
2041
2042         substream->hw_opened = 1;
2043
2044         err = snd_pcm_hw_constraints_complete(substream);
2045         if (err < 0) {
2046                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2047                 goto error;
2048         }
2049
2050         *rsubstream = substream;
2051         return 0;
2052
2053  error:
2054         snd_pcm_release_substream(substream);
2055         return err;
2056 }
2057
2058 EXPORT_SYMBOL(snd_pcm_open_substream);
2059
2060 static int snd_pcm_open_file(struct file *file,
2061                              struct snd_pcm *pcm,
2062                              int stream,
2063                              struct snd_pcm_file **rpcm_file)
2064 {
2065         struct snd_pcm_file *pcm_file;
2066         struct snd_pcm_substream *substream;
2067         struct snd_pcm_str *str;
2068         int err;
2069
2070         snd_assert(rpcm_file != NULL, return -EINVAL);
2071         *rpcm_file = NULL;
2072
2073         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2074         if (err < 0)
2075                 return err;
2076
2077         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2078         if (pcm_file == NULL) {
2079                 snd_pcm_release_substream(substream);
2080                 return -ENOMEM;
2081         }
2082         pcm_file->substream = substream;
2083         if (substream->ref_count == 1) {
2084                 str = substream->pstr;
2085                 substream->file = pcm_file;
2086                 substream->pcm_release = pcm_release_private;
2087         }
2088         file->private_data = pcm_file;
2089         *rpcm_file = pcm_file;
2090         return 0;
2091 }
2092
2093 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2094 {
2095         struct snd_pcm *pcm;
2096
2097         pcm = snd_lookup_minor_data(iminor(inode),
2098                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2099         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2100 }
2101
2102 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2103 {
2104         struct snd_pcm *pcm;
2105
2106         pcm = snd_lookup_minor_data(iminor(inode),
2107                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2108         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2109 }
2110
2111 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2112 {
2113         int err;
2114         struct snd_pcm_file *pcm_file;
2115         wait_queue_t wait;
2116
2117         if (pcm == NULL) {
2118                 err = -ENODEV;
2119                 goto __error1;
2120         }
2121         err = snd_card_file_add(pcm->card, file);
2122         if (err < 0)
2123                 goto __error1;
2124         if (!try_module_get(pcm->card->module)) {
2125                 err = -EFAULT;
2126                 goto __error2;
2127         }
2128         init_waitqueue_entry(&wait, current);
2129         add_wait_queue(&pcm->open_wait, &wait);
2130         mutex_lock(&pcm->open_mutex);
2131         while (1) {
2132                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2133                 if (err >= 0)
2134                         break;
2135                 if (err == -EAGAIN) {
2136                         if (file->f_flags & O_NONBLOCK) {
2137                                 err = -EBUSY;
2138                                 break;
2139                         }
2140                 } else
2141                         break;
2142                 set_current_state(TASK_INTERRUPTIBLE);
2143                 mutex_unlock(&pcm->open_mutex);
2144                 schedule();
2145                 mutex_lock(&pcm->open_mutex);
2146                 if (signal_pending(current)) {
2147                         err = -ERESTARTSYS;
2148                         break;
2149                 }
2150         }
2151         remove_wait_queue(&pcm->open_wait, &wait);
2152         mutex_unlock(&pcm->open_mutex);
2153         if (err < 0)
2154                 goto __error;
2155         return err;
2156
2157       __error:
2158         module_put(pcm->card->module);
2159       __error2:
2160         snd_card_file_remove(pcm->card, file);
2161       __error1:
2162         return err;
2163 }
2164
2165 static int snd_pcm_release(struct inode *inode, struct file *file)
2166 {
2167         struct snd_pcm *pcm;
2168         struct snd_pcm_substream *substream;
2169         struct snd_pcm_file *pcm_file;
2170
2171         pcm_file = file->private_data;
2172         substream = pcm_file->substream;
2173         snd_assert(substream != NULL, return -ENXIO);
2174         pcm = substream->pcm;
2175         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2176         mutex_lock(&pcm->open_mutex);
2177         snd_pcm_release_substream(substream);
2178         kfree(pcm_file);
2179         mutex_unlock(&pcm->open_mutex);
2180         wake_up(&pcm->open_wait);
2181         module_put(pcm->card->module);
2182         snd_card_file_remove(pcm->card, file);
2183         return 0;
2184 }
2185
2186 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2187                                                  snd_pcm_uframes_t frames)
2188 {
2189         struct snd_pcm_runtime *runtime = substream->runtime;
2190         snd_pcm_sframes_t appl_ptr;
2191         snd_pcm_sframes_t ret;
2192         snd_pcm_sframes_t hw_avail;
2193
2194         if (frames == 0)
2195                 return 0;
2196
2197         snd_pcm_stream_lock_irq(substream);
2198         switch (runtime->status->state) {
2199         case SNDRV_PCM_STATE_PREPARED:
2200                 break;
2201         case SNDRV_PCM_STATE_DRAINING:
2202         case SNDRV_PCM_STATE_RUNNING:
2203                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2204                         break;
2205                 /* Fall through */
2206         case SNDRV_PCM_STATE_XRUN:
2207                 ret = -EPIPE;
2208                 goto __end;
2209         default:
2210                 ret = -EBADFD;
2211                 goto __end;
2212         }
2213
2214         hw_avail = snd_pcm_playback_hw_avail(runtime);
2215         if (hw_avail <= 0) {
2216                 ret = 0;
2217                 goto __end;
2218         }
2219         if (frames > (snd_pcm_uframes_t)hw_avail)
2220                 frames = hw_avail;
2221         appl_ptr = runtime->control->appl_ptr - frames;
2222         if (appl_ptr < 0)
2223                 appl_ptr += runtime->boundary;
2224         runtime->control->appl_ptr = appl_ptr;
2225         ret = frames;
2226  __end:
2227         snd_pcm_stream_unlock_irq(substream);
2228         return ret;
2229 }
2230
2231 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2232                                                 snd_pcm_uframes_t frames)
2233 {
2234         struct snd_pcm_runtime *runtime = substream->runtime;
2235         snd_pcm_sframes_t appl_ptr;
2236         snd_pcm_sframes_t ret;
2237         snd_pcm_sframes_t hw_avail;
2238
2239         if (frames == 0)
2240                 return 0;
2241
2242         snd_pcm_stream_lock_irq(substream);
2243         switch (runtime->status->state) {
2244         case SNDRV_PCM_STATE_PREPARED:
2245         case SNDRV_PCM_STATE_DRAINING:
2246                 break;
2247         case SNDRV_PCM_STATE_RUNNING:
2248                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2249                         break;
2250                 /* Fall through */
2251         case SNDRV_PCM_STATE_XRUN:
2252                 ret = -EPIPE;
2253                 goto __end;
2254         default:
2255                 ret = -EBADFD;
2256                 goto __end;
2257         }
2258
2259         hw_avail = snd_pcm_capture_hw_avail(runtime);
2260         if (hw_avail <= 0) {
2261                 ret = 0;
2262                 goto __end;
2263         }
2264         if (frames > (snd_pcm_uframes_t)hw_avail)
2265                 frames = hw_avail;
2266         appl_ptr = runtime->control->appl_ptr - frames;
2267         if (appl_ptr < 0)
2268                 appl_ptr += runtime->boundary;
2269         runtime->control->appl_ptr = appl_ptr;
2270         ret = frames;
2271  __end:
2272         snd_pcm_stream_unlock_irq(substream);
2273         return ret;
2274 }
2275
2276 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2277                                                   snd_pcm_uframes_t frames)
2278 {
2279         struct snd_pcm_runtime *runtime = substream->runtime;
2280         snd_pcm_sframes_t appl_ptr;
2281         snd_pcm_sframes_t ret;
2282         snd_pcm_sframes_t avail;
2283
2284         if (frames == 0)
2285                 return 0;
2286
2287         snd_pcm_stream_lock_irq(substream);
2288         switch (runtime->status->state) {
2289         case SNDRV_PCM_STATE_PREPARED:
2290         case SNDRV_PCM_STATE_PAUSED:
2291                 break;
2292         case SNDRV_PCM_STATE_DRAINING:
2293         case SNDRV_PCM_STATE_RUNNING:
2294                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2295                         break;
2296                 /* Fall through */
2297         case SNDRV_PCM_STATE_XRUN:
2298                 ret = -EPIPE;
2299                 goto __end;
2300         default:
2301                 ret = -EBADFD;
2302                 goto __end;
2303         }
2304
2305         avail = snd_pcm_playback_avail(runtime);
2306         if (avail <= 0) {
2307                 ret = 0;
2308                 goto __end;
2309         }
2310         if (frames > (snd_pcm_uframes_t)avail)
2311                 frames = avail;
2312         appl_ptr = runtime->control->appl_ptr + frames;
2313         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2314                 appl_ptr -= runtime->boundary;
2315         runtime->control->appl_ptr = appl_ptr;
2316         ret = frames;
2317  __end:
2318         snd_pcm_stream_unlock_irq(substream);
2319         return ret;
2320 }
2321
2322 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2323                                                  snd_pcm_uframes_t frames)
2324 {
2325         struct snd_pcm_runtime *runtime = substream->runtime;
2326         snd_pcm_sframes_t appl_ptr;
2327         snd_pcm_sframes_t ret;
2328         snd_pcm_sframes_t avail;
2329
2330         if (frames == 0)
2331                 return 0;
2332
2333         snd_pcm_stream_lock_irq(substream);
2334         switch (runtime->status->state) {
2335         case SNDRV_PCM_STATE_PREPARED:
2336         case SNDRV_PCM_STATE_DRAINING:
2337         case SNDRV_PCM_STATE_PAUSED:
2338                 break;
2339         case SNDRV_PCM_STATE_RUNNING:
2340                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2341                         break;
2342                 /* Fall through */
2343         case SNDRV_PCM_STATE_XRUN:
2344                 ret = -EPIPE;
2345                 goto __end;
2346         default:
2347                 ret = -EBADFD;
2348                 goto __end;
2349         }
2350
2351         avail = snd_pcm_capture_avail(runtime);
2352         if (avail <= 0) {
2353                 ret = 0;
2354                 goto __end;
2355         }
2356         if (frames > (snd_pcm_uframes_t)avail)
2357                 frames = avail;
2358         appl_ptr = runtime->control->appl_ptr + frames;
2359         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2360                 appl_ptr -= runtime->boundary;
2361         runtime->control->appl_ptr = appl_ptr;
2362         ret = frames;
2363  __end:
2364         snd_pcm_stream_unlock_irq(substream);
2365         return ret;
2366 }
2367
2368 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2369 {
2370         struct snd_pcm_runtime *runtime = substream->runtime;
2371         int err;
2372
2373         snd_pcm_stream_lock_irq(substream);
2374         switch (runtime->status->state) {
2375         case SNDRV_PCM_STATE_DRAINING:
2376                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2377                         goto __badfd;
2378         case SNDRV_PCM_STATE_RUNNING:
2379                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2380                         break;
2381                 /* Fall through */
2382         case SNDRV_PCM_STATE_PREPARED:
2383         case SNDRV_PCM_STATE_SUSPENDED:
2384                 err = 0;
2385                 break;
2386         case SNDRV_PCM_STATE_XRUN:
2387                 err = -EPIPE;
2388                 break;
2389         default:
2390               __badfd:
2391                 err = -EBADFD;
2392                 break;
2393         }
2394         snd_pcm_stream_unlock_irq(substream);
2395         return err;
2396 }
2397                 
2398 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2399                          snd_pcm_sframes_t __user *res)
2400 {
2401         struct snd_pcm_runtime *runtime = substream->runtime;
2402         int err;
2403         snd_pcm_sframes_t n = 0;
2404
2405         snd_pcm_stream_lock_irq(substream);
2406         switch (runtime->status->state) {
2407         case SNDRV_PCM_STATE_DRAINING:
2408                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2409                         goto __badfd;
2410         case SNDRV_PCM_STATE_RUNNING:
2411                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2412                         break;
2413                 /* Fall through */
2414         case SNDRV_PCM_STATE_PREPARED:
2415         case SNDRV_PCM_STATE_SUSPENDED:
2416                 err = 0;
2417                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2418                         n = snd_pcm_playback_hw_avail(runtime);
2419                 else
2420                         n = snd_pcm_capture_avail(runtime);
2421                 break;
2422         case SNDRV_PCM_STATE_XRUN:
2423                 err = -EPIPE;
2424                 break;
2425         default:
2426               __badfd:
2427                 err = -EBADFD;
2428                 break;
2429         }
2430         snd_pcm_stream_unlock_irq(substream);
2431         if (!err)
2432                 if (put_user(n, res))
2433                         err = -EFAULT;
2434         return err;
2435 }
2436                 
2437 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2438                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2439 {
2440         struct snd_pcm_runtime *runtime = substream->runtime;
2441         struct snd_pcm_sync_ptr sync_ptr;
2442         volatile struct snd_pcm_mmap_status *status;
2443         volatile struct snd_pcm_mmap_control *control;
2444         int err;
2445
2446         memset(&sync_ptr, 0, sizeof(sync_ptr));
2447         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2448                 return -EFAULT;
2449         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2450                 return -EFAULT; 
2451         status = runtime->status;
2452         control = runtime->control;
2453         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2454                 err = snd_pcm_hwsync(substream);
2455                 if (err < 0)
2456                         return err;
2457         }
2458         snd_pcm_stream_lock_irq(substream);
2459         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2460                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2461         else
2462                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2463         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2464                 control->avail_min = sync_ptr.c.control.avail_min;
2465         else
2466                 sync_ptr.c.control.avail_min = control->avail_min;
2467         sync_ptr.s.status.state = status->state;
2468         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2469         sync_ptr.s.status.tstamp = status->tstamp;
2470         sync_ptr.s.status.suspended_state = status->suspended_state;
2471         snd_pcm_stream_unlock_irq(substream);
2472         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2473                 return -EFAULT;
2474         return 0;
2475 }
2476
2477 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2478 {
2479         struct snd_pcm_runtime *runtime = substream->runtime;
2480         int arg;
2481         
2482         if (get_user(arg, _arg))
2483                 return -EFAULT;
2484         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2485                 return -EINVAL;
2486         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2487         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2488                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2489         return 0;
2490 }
2491                 
2492 static int snd_pcm_common_ioctl1(struct file *file,
2493                                  struct snd_pcm_substream *substream,
2494                                  unsigned int cmd, void __user *arg)
2495 {
2496         snd_assert(substream != NULL, return -ENXIO);
2497
2498         switch (cmd) {
2499         case SNDRV_PCM_IOCTL_PVERSION:
2500                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2501         case SNDRV_PCM_IOCTL_INFO:
2502                 return snd_pcm_info_user(substream, arg);
2503         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2504                 return 0;
2505         case SNDRV_PCM_IOCTL_TTSTAMP:
2506                 return snd_pcm_tstamp(substream, arg);
2507         case SNDRV_PCM_IOCTL_HW_REFINE:
2508                 return snd_pcm_hw_refine_user(substream, arg);
2509         case SNDRV_PCM_IOCTL_HW_PARAMS:
2510                 return snd_pcm_hw_params_user(substream, arg);
2511         case SNDRV_PCM_IOCTL_HW_FREE:
2512                 return snd_pcm_hw_free(substream);
2513         case SNDRV_PCM_IOCTL_SW_PARAMS:
2514                 return snd_pcm_sw_params_user(substream, arg);
2515         case SNDRV_PCM_IOCTL_STATUS:
2516                 return snd_pcm_status_user(substream, arg);
2517         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2518                 return snd_pcm_channel_info_user(substream, arg);
2519         case SNDRV_PCM_IOCTL_PREPARE:
2520                 return snd_pcm_prepare(substream, file);
2521         case SNDRV_PCM_IOCTL_RESET:
2522                 return snd_pcm_reset(substream);
2523         case SNDRV_PCM_IOCTL_START:
2524                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2525         case SNDRV_PCM_IOCTL_LINK:
2526                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2527         case SNDRV_PCM_IOCTL_UNLINK:
2528                 return snd_pcm_unlink(substream);
2529         case SNDRV_PCM_IOCTL_RESUME:
2530                 return snd_pcm_resume(substream);
2531         case SNDRV_PCM_IOCTL_XRUN:
2532                 return snd_pcm_xrun(substream);
2533         case SNDRV_PCM_IOCTL_HWSYNC:
2534                 return snd_pcm_hwsync(substream);
2535         case SNDRV_PCM_IOCTL_DELAY:
2536                 return snd_pcm_delay(substream, arg);
2537         case SNDRV_PCM_IOCTL_SYNC_PTR:
2538                 return snd_pcm_sync_ptr(substream, arg);
2539 #ifdef CONFIG_SND_SUPPORT_OLD_API
2540         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2541                 return snd_pcm_hw_refine_old_user(substream, arg);
2542         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2543                 return snd_pcm_hw_params_old_user(substream, arg);
2544 #endif
2545         case SNDRV_PCM_IOCTL_DRAIN:
2546                 return snd_pcm_drain(substream);
2547         case SNDRV_PCM_IOCTL_DROP:
2548                 return snd_pcm_drop(substream);
2549         case SNDRV_PCM_IOCTL_PAUSE:
2550         {
2551                 int res;
2552                 snd_pcm_stream_lock_irq(substream);
2553                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2554                 snd_pcm_stream_unlock_irq(substream);
2555                 return res;
2556         }
2557         }
2558         snd_printd("unknown ioctl = 0x%x\n", cmd);
2559         return -ENOTTY;
2560 }
2561
2562 static int snd_pcm_playback_ioctl1(struct file *file,
2563                                    struct snd_pcm_substream *substream,
2564                                    unsigned int cmd, void __user *arg)
2565 {
2566         snd_assert(substream != NULL, return -ENXIO);
2567         snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2568         switch (cmd) {
2569         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2570         {
2571                 struct snd_xferi xferi;
2572                 struct snd_xferi __user *_xferi = arg;
2573                 struct snd_pcm_runtime *runtime = substream->runtime;
2574                 snd_pcm_sframes_t result;
2575                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2576                         return -EBADFD;
2577                 if (put_user(0, &_xferi->result))
2578                         return -EFAULT;
2579                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2580                         return -EFAULT;
2581                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2582                 __put_user(result, &_xferi->result);
2583                 return result < 0 ? result : 0;
2584         }
2585         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2586         {
2587                 struct snd_xfern xfern;
2588                 struct snd_xfern __user *_xfern = arg;
2589                 struct snd_pcm_runtime *runtime = substream->runtime;
2590                 void __user **bufs;
2591                 snd_pcm_sframes_t result;
2592                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2593                         return -EBADFD;
2594                 if (runtime->channels > 128)
2595                         return -EINVAL;
2596                 if (put_user(0, &_xfern->result))
2597                         return -EFAULT;
2598                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2599                         return -EFAULT;
2600                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2601                 if (bufs == NULL)
2602                         return -ENOMEM;
2603                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2604                         kfree(bufs);
2605                         return -EFAULT;
2606                 }
2607                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2608                 kfree(bufs);
2609                 __put_user(result, &_xfern->result);
2610                 return result < 0 ? result : 0;
2611         }
2612         case SNDRV_PCM_IOCTL_REWIND:
2613         {
2614                 snd_pcm_uframes_t frames;
2615                 snd_pcm_uframes_t __user *_frames = arg;
2616                 snd_pcm_sframes_t result;
2617                 if (get_user(frames, _frames))
2618                         return -EFAULT;
2619                 if (put_user(0, _frames))
2620                         return -EFAULT;
2621                 result = snd_pcm_playback_rewind(substream, frames);
2622                 __put_user(result, _frames);
2623                 return result < 0 ? result : 0;
2624         }
2625         case SNDRV_PCM_IOCTL_FORWARD:
2626         {
2627                 snd_pcm_uframes_t frames;
2628                 snd_pcm_uframes_t __user *_frames = arg;
2629                 snd_pcm_sframes_t result;
2630                 if (get_user(frames, _frames))
2631                         return -EFAULT;
2632                 if (put_user(0, _frames))
2633                         return -EFAULT;
2634                 result = snd_pcm_playback_forward(substream, frames);
2635                 __put_user(result, _frames);
2636                 return result < 0 ? result : 0;
2637         }
2638         }
2639         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2640 }
2641
2642 static int snd_pcm_capture_ioctl1(struct file *file,
2643                                   struct snd_pcm_substream *substream,
2644                                   unsigned int cmd, void __user *arg)
2645 {
2646         snd_assert(substream != NULL, return -ENXIO);
2647         snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2648         switch (cmd) {
2649         case SNDRV_PCM_IOCTL_READI_FRAMES:
2650         {
2651                 struct snd_xferi xferi;
2652                 struct snd_xferi __user *_xferi = arg;
2653                 struct snd_pcm_runtime *runtime = substream->runtime;
2654                 snd_pcm_sframes_t result;
2655                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2656                         return -EBADFD;
2657                 if (put_user(0, &_xferi->result))
2658                         return -EFAULT;
2659                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2660                         return -EFAULT;
2661                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2662                 __put_user(result, &_xferi->result);
2663                 return result < 0 ? result : 0;
2664         }
2665         case SNDRV_PCM_IOCTL_READN_FRAMES:
2666         {
2667                 struct snd_xfern xfern;
2668                 struct snd_xfern __user *_xfern = arg;
2669                 struct snd_pcm_runtime *runtime = substream->runtime;
2670                 void *bufs;
2671                 snd_pcm_sframes_t result;
2672                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2673                         return -EBADFD;
2674                 if (runtime->channels > 128)
2675                         return -EINVAL;
2676                 if (put_user(0, &_xfern->result))
2677                         return -EFAULT;
2678                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2679                         return -EFAULT;
2680                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2681                 if (bufs == NULL)
2682                         return -ENOMEM;
2683                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2684                         kfree(bufs);
2685                         return -EFAULT;
2686                 }
2687                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2688                 kfree(bufs);
2689                 __put_user(result, &_xfern->result);
2690                 return result < 0 ? result : 0;
2691         }
2692         case SNDRV_PCM_IOCTL_REWIND:
2693         {
2694                 snd_pcm_uframes_t frames;
2695                 snd_pcm_uframes_t __user *_frames = arg;
2696                 snd_pcm_sframes_t result;
2697                 if (get_user(frames, _frames))
2698                         return -EFAULT;
2699                 if (put_user(0, _frames))
2700                         return -EFAULT;
2701                 result = snd_pcm_capture_rewind(substream, frames);
2702                 __put_user(result, _frames);
2703                 return result < 0 ? result : 0;
2704         }
2705         case SNDRV_PCM_IOCTL_FORWARD:
2706         {
2707                 snd_pcm_uframes_t frames;
2708                 snd_pcm_uframes_t __user *_frames = arg;
2709                 snd_pcm_sframes_t result;
2710                 if (get_user(frames, _frames))
2711                         return -EFAULT;
2712                 if (put_user(0, _frames))
2713                         return -EFAULT;
2714                 result = snd_pcm_capture_forward(substream, frames);
2715                 __put_user(result, _frames);
2716                 return result < 0 ? result : 0;
2717         }
2718         }
2719         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2720 }
2721
2722 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2723                                    unsigned long arg)
2724 {
2725         struct snd_pcm_file *pcm_file;
2726
2727         pcm_file = file->private_data;
2728
2729         if (((cmd >> 8) & 0xff) != 'A')
2730                 return -ENOTTY;
2731
2732         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2733                                        (void __user *)arg);
2734 }
2735
2736 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2737                                   unsigned long arg)
2738 {
2739         struct snd_pcm_file *pcm_file;
2740
2741         pcm_file = file->private_data;
2742
2743         if (((cmd >> 8) & 0xff) != 'A')
2744                 return -ENOTTY;
2745
2746         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2747                                       (void __user *)arg);
2748 }
2749
2750 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2751                          unsigned int cmd, void *arg)
2752 {
2753         mm_segment_t fs;
2754         int result;
2755         
2756         fs = snd_enter_user();
2757         switch (substream->stream) {
2758         case SNDRV_PCM_STREAM_PLAYBACK:
2759                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2760                                                  (void __user *)arg);
2761                 break;
2762         case SNDRV_PCM_STREAM_CAPTURE:
2763                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2764                                                 (void __user *)arg);
2765                 break;
2766         default:
2767                 result = -EINVAL;
2768                 break;
2769         }
2770         snd_leave_user(fs);
2771         return result;
2772 }
2773
2774 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2775
2776 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2777                             loff_t * offset)
2778 {
2779         struct snd_pcm_file *pcm_file;
2780         struct snd_pcm_substream *substream;
2781         struct snd_pcm_runtime *runtime;
2782         snd_pcm_sframes_t result;
2783
2784         pcm_file = file->private_data;
2785         substream = pcm_file->substream;
2786         snd_assert(substream != NULL, return -ENXIO);
2787         runtime = substream->runtime;
2788         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2789                 return -EBADFD;
2790         if (!frame_aligned(runtime, count))
2791                 return -EINVAL;
2792         count = bytes_to_frames(runtime, count);
2793         result = snd_pcm_lib_read(substream, buf, count);
2794         if (result > 0)
2795                 result = frames_to_bytes(runtime, result);
2796         return result;
2797 }
2798
2799 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2800                              size_t count, loff_t * offset)
2801 {
2802         struct snd_pcm_file *pcm_file;
2803         struct snd_pcm_substream *substream;
2804         struct snd_pcm_runtime *runtime;
2805         snd_pcm_sframes_t result;
2806
2807         pcm_file = file->private_data;
2808         substream = pcm_file->substream;
2809         snd_assert(substream != NULL, result = -ENXIO; goto end);
2810         runtime = substream->runtime;
2811         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2812                 result = -EBADFD;
2813                 goto end;
2814         }
2815         if (!frame_aligned(runtime, count)) {
2816                 result = -EINVAL;
2817                 goto end;
2818         }
2819         count = bytes_to_frames(runtime, count);
2820         result = snd_pcm_lib_write(substream, buf, count);
2821         if (result > 0)
2822                 result = frames_to_bytes(runtime, result);
2823  end:
2824         return result;
2825 }
2826
2827 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2828                              unsigned long nr_segs, loff_t pos)
2829
2830 {
2831         struct snd_pcm_file *pcm_file;
2832         struct snd_pcm_substream *substream;
2833         struct snd_pcm_runtime *runtime;
2834         snd_pcm_sframes_t result;
2835         unsigned long i;
2836         void __user **bufs;
2837         snd_pcm_uframes_t frames;
2838
2839         pcm_file = iocb->ki_filp->private_data;
2840         substream = pcm_file->substream;
2841         snd_assert(substream != NULL, return -ENXIO);
2842         runtime = substream->runtime;
2843         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2844                 return -EBADFD;
2845         if (nr_segs > 1024 || nr_segs != runtime->channels)
2846                 return -EINVAL;
2847         if (!frame_aligned(runtime, iov->iov_len))
2848                 return -EINVAL;
2849         frames = bytes_to_samples(runtime, iov->iov_len);
2850         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2851         if (bufs == NULL)
2852                 return -ENOMEM;
2853         for (i = 0; i < nr_segs; ++i)
2854                 bufs[i] = iov[i].iov_base;
2855         result = snd_pcm_lib_readv(substream, bufs, frames);
2856         if (result > 0)
2857                 result = frames_to_bytes(runtime, result);
2858         kfree(bufs);
2859         return result;
2860 }
2861
2862 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2863                               unsigned long nr_segs, loff_t pos)
2864 {
2865         struct snd_pcm_file *pcm_file;
2866         struct snd_pcm_substream *substream;
2867         struct snd_pcm_runtime *runtime;
2868         snd_pcm_sframes_t result;
2869         unsigned long i;
2870         void __user **bufs;
2871         snd_pcm_uframes_t frames;
2872
2873         pcm_file = iocb->ki_filp->private_data;
2874         substream = pcm_file->substream;
2875         snd_assert(substream != NULL, result = -ENXIO; goto end);
2876         runtime = substream->runtime;
2877         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2878                 result = -EBADFD;
2879                 goto end;
2880         }
2881         if (nr_segs > 128 || nr_segs != runtime->channels ||
2882             !frame_aligned(runtime, iov->iov_len)) {
2883                 result = -EINVAL;
2884                 goto end;
2885         }
2886         frames = bytes_to_samples(runtime, iov->iov_len);
2887         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2888         if (bufs == NULL)
2889                 return -ENOMEM;
2890         for (i = 0; i < nr_segs; ++i)
2891                 bufs[i] = iov[i].iov_base;
2892         result = snd_pcm_lib_writev(substream, bufs, frames);
2893         if (result > 0)
2894                 result = frames_to_bytes(runtime, result);
2895         kfree(bufs);
2896  end:
2897         return result;
2898 }
2899
2900 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2901 {
2902         struct snd_pcm_file *pcm_file;
2903         struct snd_pcm_substream *substream;
2904         struct snd_pcm_runtime *runtime;
2905         unsigned int mask;
2906         snd_pcm_uframes_t avail;
2907
2908         pcm_file = file->private_data;
2909
2910         substream = pcm_file->substream;
2911         snd_assert(substream != NULL, return -ENXIO);
2912         runtime = substream->runtime;
2913
2914         poll_wait(file, &runtime->sleep, wait);
2915
2916         snd_pcm_stream_lock_irq(substream);
2917         avail = snd_pcm_playback_avail(runtime);
2918         switch (runtime->status->state) {
2919         case SNDRV_PCM_STATE_RUNNING:
2920         case SNDRV_PCM_STATE_PREPARED:
2921         case SNDRV_PCM_STATE_PAUSED:
2922                 if (avail >= runtime->control->avail_min) {
2923                         mask = POLLOUT | POLLWRNORM;
2924                         break;
2925                 }
2926                 /* Fall through */
2927         case SNDRV_PCM_STATE_DRAINING:
2928                 mask = 0;
2929                 break;
2930         default:
2931                 mask = POLLOUT | POLLWRNORM | POLLERR;
2932                 break;
2933         }
2934         snd_pcm_stream_unlock_irq(substream);
2935         return mask;
2936 }
2937
2938 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2939 {
2940         struct snd_pcm_file *pcm_file;
2941         struct snd_pcm_substream *substream;
2942         struct snd_pcm_runtime *runtime;
2943         unsigned int mask;
2944         snd_pcm_uframes_t avail;
2945
2946         pcm_file = file->private_data;
2947
2948         substream = pcm_file->substream;
2949         snd_assert(substream != NULL, return -ENXIO);
2950         runtime = substream->runtime;
2951
2952         poll_wait(file, &runtime->sleep, wait);
2953
2954         snd_pcm_stream_lock_irq(substream);
2955         avail = snd_pcm_capture_avail(runtime);
2956         switch (runtime->status->state) {
2957         case SNDRV_PCM_STATE_RUNNING:
2958         case SNDRV_PCM_STATE_PREPARED:
2959         case SNDRV_PCM_STATE_PAUSED:
2960                 if (avail >= runtime->control->avail_min) {
2961                         mask = POLLIN | POLLRDNORM;
2962                         break;
2963                 }
2964                 mask = 0;
2965                 break;
2966         case SNDRV_PCM_STATE_DRAINING:
2967                 if (avail > 0) {
2968                         mask = POLLIN | POLLRDNORM;
2969                         break;
2970                 }
2971                 /* Fall through */
2972         default:
2973                 mask = POLLIN | POLLRDNORM | POLLERR;
2974                 break;
2975         }
2976         snd_pcm_stream_unlock_irq(substream);
2977         return mask;
2978 }
2979
2980 /*
2981  * mmap support
2982  */
2983
2984 /*
2985  * Only on coherent architectures, we can mmap the status and the control records
2986  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2987  */
2988 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2989 /*
2990  * mmap status record
2991  */
2992 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2993                                                 struct vm_fault *vmf)
2994 {
2995         struct snd_pcm_substream *substream = area->vm_private_data;
2996         struct snd_pcm_runtime *runtime;
2997         
2998         if (substream == NULL)
2999                 return VM_FAULT_SIGBUS;
3000         runtime = substream->runtime;
3001         vmf->page = virt_to_page(runtime->status);
3002         get_page(vmf->page);
3003         return 0;
3004 }
3005
3006 static struct vm_operations_struct snd_pcm_vm_ops_status =
3007 {
3008         .fault =        snd_pcm_mmap_status_fault,
3009 };
3010
3011 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3012                                struct vm_area_struct *area)
3013 {
3014         struct snd_pcm_runtime *runtime;
3015         long size;
3016         if (!(area->vm_flags & VM_READ))
3017                 return -EINVAL;
3018         runtime = substream->runtime;
3019         snd_assert(runtime != NULL, return -EAGAIN);
3020         size = area->vm_end - area->vm_start;
3021         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3022                 return -EINVAL;
3023         area->vm_ops = &snd_pcm_vm_ops_status;
3024         area->vm_private_data = substream;
3025         area->vm_flags |= VM_RESERVED;
3026         return 0;
3027 }
3028
3029 /*
3030  * mmap control record
3031  */
3032 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3033                                                 struct vm_fault *vmf)
3034 {
3035         struct snd_pcm_substream *substream = area->vm_private_data;
3036         struct snd_pcm_runtime *runtime;
3037         
3038         if (substream == NULL)
3039                 return VM_FAULT_SIGBUS;
3040         runtime = substream->runtime;
3041         vmf->page = virt_to_page(runtime->control);
3042         get_page(vmf->page);
3043         return 0;
3044 }
3045
3046 static struct vm_operations_struct snd_pcm_vm_ops_control =
3047 {
3048         .fault =        snd_pcm_mmap_control_fault,
3049 };
3050
3051 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3052                                 struct vm_area_struct *area)
3053 {
3054         struct snd_pcm_runtime *runtime;
3055         long size;
3056         if (!(area->vm_flags & VM_READ))
3057                 return -EINVAL;
3058         runtime = substream->runtime;
3059         snd_assert(runtime != NULL, return -EAGAIN);
3060         size = area->vm_end - area->vm_start;
3061         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3062                 return -EINVAL;
3063         area->vm_ops = &snd_pcm_vm_ops_control;
3064         area->vm_private_data = substream;
3065         area->vm_flags |= VM_RESERVED;
3066         return 0;
3067 }
3068 #else /* ! coherent mmap */
3069 /*
3070  * don't support mmap for status and control records.
3071  */
3072 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3073                                struct vm_area_struct *area)
3074 {
3075         return -ENXIO;
3076 }
3077 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3078                                 struct vm_area_struct *area)
3079 {
3080         return -ENXIO;
3081 }
3082 #endif /* coherent mmap */
3083
3084 /*
3085  * fault callback for mmapping a RAM page
3086  */
3087 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3088                                                 struct vm_fault *vmf)
3089 {
3090         struct snd_pcm_substream *substream = area->vm_private_data;
3091         struct snd_pcm_runtime *runtime;
3092         unsigned long offset;
3093         struct page * page;
3094         void *vaddr;
3095         size_t dma_bytes;
3096         
3097         if (substream == NULL)
3098                 return VM_FAULT_SIGBUS;
3099         runtime = substream->runtime;
3100         offset = vmf->pgoff << PAGE_SHIFT;
3101         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3102         if (offset > dma_bytes - PAGE_SIZE)
3103                 return VM_FAULT_SIGBUS;
3104         if (substream->ops->page) {
3105                 page = substream->ops->page(substream, offset);
3106                 if (!page)
3107                         return VM_FAULT_SIGBUS;
3108         } else {
3109                 vaddr = runtime->dma_area + offset;
3110                 page = virt_to_page(vaddr);
3111         }
3112         get_page(page);
3113         vmf->page = page;
3114         return 0;
3115 }
3116
3117 static struct vm_operations_struct snd_pcm_vm_ops_data =
3118 {
3119         .open =         snd_pcm_mmap_data_open,
3120         .close =        snd_pcm_mmap_data_close,
3121         .fault =        snd_pcm_mmap_data_fault,
3122 };
3123
3124 /*
3125  * mmap the DMA buffer on RAM
3126  */
3127 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3128                                 struct vm_area_struct *area)
3129 {
3130         area->vm_ops = &snd_pcm_vm_ops_data;
3131         area->vm_private_data = substream;
3132         area->vm_flags |= VM_RESERVED;
3133         atomic_inc(&substream->mmap_count);
3134         return 0;
3135 }
3136
3137 /*
3138  * mmap the DMA buffer on I/O memory area
3139  */
3140 #if SNDRV_PCM_INFO_MMAP_IOMEM
3141 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3142 {
3143         .open =         snd_pcm_mmap_data_open,
3144         .close =        snd_pcm_mmap_data_close,
3145 };
3146
3147 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3148                            struct vm_area_struct *area)
3149 {
3150         long size;
3151         unsigned long offset;
3152
3153 #ifdef pgprot_noncached
3154         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3155 #endif
3156         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3157         area->vm_private_data = substream;
3158         area->vm_flags |= VM_IO;
3159         size = area->vm_end - area->vm_start;
3160         offset = area->vm_pgoff << PAGE_SHIFT;
3161         if (io_remap_pfn_range(area, area->vm_start,
3162                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3163                                 size, area->vm_page_prot))
3164                 return -EAGAIN;
3165         atomic_inc(&substream->mmap_count);
3166         return 0;
3167 }
3168
3169 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3170 #endif /* SNDRV_PCM_INFO_MMAP */
3171
3172 /*
3173  * mmap DMA buffer
3174  */
3175 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3176                       struct vm_area_struct *area)
3177 {
3178         struct snd_pcm_runtime *runtime;
3179         long size;
3180         unsigned long offset;
3181         size_t dma_bytes;
3182
3183         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3184                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3185                         return -EINVAL;
3186         } else {
3187                 if (!(area->vm_flags & VM_READ))
3188                         return -EINVAL;
3189         }
3190         runtime = substream->runtime;
3191         snd_assert(runtime != NULL, return -EAGAIN);
3192         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3193                 return -EBADFD;
3194         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3195                 return -ENXIO;
3196         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3197             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3198                 return -EINVAL;
3199         size = area->vm_end - area->vm_start;
3200         offset = area->vm_pgoff << PAGE_SHIFT;
3201         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3202         if ((size_t)size > dma_bytes)
3203                 return -EINVAL;
3204         if (offset > dma_bytes - size)
3205                 return -EINVAL;
3206
3207         if (substream->ops->mmap)
3208                 return substream->ops->mmap(substream, area);
3209         else
3210                 return snd_pcm_default_mmap(substream, area);
3211 }
3212
3213 EXPORT_SYMBOL(snd_pcm_mmap_data);
3214
3215 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3216 {
3217         struct snd_pcm_file * pcm_file;
3218         struct snd_pcm_substream *substream;    
3219         unsigned long offset;
3220         
3221         pcm_file = file->private_data;
3222         substream = pcm_file->substream;
3223         snd_assert(substream != NULL, return -ENXIO);
3224
3225         offset = area->vm_pgoff << PAGE_SHIFT;
3226         switch (offset) {
3227         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3228                 if (pcm_file->no_compat_mmap)
3229                         return -ENXIO;
3230                 return snd_pcm_mmap_status(substream, file, area);
3231         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3232                 if (pcm_file->no_compat_mmap)
3233                         return -ENXIO;
3234                 return snd_pcm_mmap_control(substream, file, area);
3235         default:
3236                 return snd_pcm_mmap_data(substream, file, area);
3237         }
3238         return 0;
3239 }
3240
3241 static int snd_pcm_fasync(int fd, struct file * file, int on)
3242 {
3243         struct snd_pcm_file * pcm_file;
3244         struct snd_pcm_substream *substream;
3245         struct snd_pcm_runtime *runtime;
3246         int err = -ENXIO;
3247
3248         lock_kernel();
3249         pcm_file = file->private_data;
3250         substream = pcm_file->substream;
3251         snd_assert(substream != NULL, goto out);
3252         runtime = substream->runtime;
3253
3254         err = fasync_helper(fd, file, on, &runtime->fasync);
3255 out:
3256         unlock_kernel();
3257         if (err < 0)
3258                 return err;
3259         return 0;
3260 }
3261
3262 /*
3263  * ioctl32 compat
3264  */
3265 #ifdef CONFIG_COMPAT
3266 #include "pcm_compat.c"
3267 #else
3268 #define snd_pcm_ioctl_compat    NULL
3269 #endif
3270
3271 /*
3272  *  To be removed helpers to keep binary compatibility
3273  */
3274
3275 #ifdef CONFIG_SND_SUPPORT_OLD_API
3276 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3277 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3278
3279 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3280                                                struct snd_pcm_hw_params_old *oparams)
3281 {
3282         unsigned int i;
3283
3284         memset(params, 0, sizeof(*params));
3285         params->flags = oparams->flags;
3286         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3287                 params->masks[i].bits[0] = oparams->masks[i];
3288         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3289         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3290         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3291         params->info = oparams->info;
3292         params->msbits = oparams->msbits;
3293         params->rate_num = oparams->rate_num;
3294         params->rate_den = oparams->rate_den;
3295         params->fifo_size = oparams->fifo_size;
3296 }
3297
3298 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3299                                              struct snd_pcm_hw_params *params)
3300 {
3301         unsigned int i;
3302
3303         memset(oparams, 0, sizeof(*oparams));
3304         oparams->flags = params->flags;
3305         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3306                 oparams->masks[i] = params->masks[i].bits[0];
3307         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3308         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3309         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3310         oparams->info = params->info;
3311         oparams->msbits = params->msbits;
3312         oparams->rate_num = params->rate_num;
3313         oparams->rate_den = params->rate_den;
3314         oparams->fifo_size = params->fifo_size;
3315 }
3316
3317 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3318                                       struct snd_pcm_hw_params_old __user * _oparams)
3319 {
3320         struct snd_pcm_hw_params *params;
3321         struct snd_pcm_hw_params_old *oparams = NULL;
3322         int err;
3323
3324         params = kmalloc(sizeof(*params), GFP_KERNEL);
3325         if (!params) {
3326                 err = -ENOMEM;
3327                 goto out;
3328         }
3329         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3330         if (!oparams) {
3331                 err = -ENOMEM;
3332                 goto out;
3333         }
3334
3335         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3336                 err = -EFAULT;
3337                 goto out;
3338         }
3339         snd_pcm_hw_convert_from_old_params(params, oparams);
3340         err = snd_pcm_hw_refine(substream, params);
3341         snd_pcm_hw_convert_to_old_params(oparams, params);
3342         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3343                 if (!err)
3344                         err = -EFAULT;
3345         }
3346 out:
3347         kfree(params);
3348         kfree(oparams);
3349         return err;
3350 }
3351
3352 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3353                                       struct snd_pcm_hw_params_old __user * _oparams)
3354 {
3355         struct snd_pcm_hw_params *params;
3356         struct snd_pcm_hw_params_old *oparams = NULL;
3357         int err;
3358
3359         params = kmalloc(sizeof(*params), GFP_KERNEL);
3360         if (!params) {
3361                 err = -ENOMEM;
3362                 goto out;
3363         }
3364         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3365         if (!oparams) {
3366                 err = -ENOMEM;
3367                 goto out;
3368         }
3369         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3370                 err = -EFAULT;
3371                 goto out;
3372         }
3373         snd_pcm_hw_convert_from_old_params(params, oparams);
3374         err = snd_pcm_hw_params(substream, params);
3375         snd_pcm_hw_convert_to_old_params(oparams, params);
3376         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3377                 if (!err)
3378                         err = -EFAULT;
3379         }
3380 out:
3381         kfree(params);
3382         kfree(oparams);
3383         return err;
3384 }
3385 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3386
3387 /*
3388  *  Register section
3389  */
3390
3391 const struct file_operations snd_pcm_f_ops[2] = {
3392         {
3393                 .owner =                THIS_MODULE,
3394                 .write =                snd_pcm_write,
3395                 .aio_write =            snd_pcm_aio_write,
3396                 .open =                 snd_pcm_playback_open,
3397                 .release =              snd_pcm_release,
3398                 .poll =                 snd_pcm_playback_poll,
3399                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3400                 .compat_ioctl =         snd_pcm_ioctl_compat,
3401                 .mmap =                 snd_pcm_mmap,
3402                 .fasync =               snd_pcm_fasync,
3403         },
3404         {
3405                 .owner =                THIS_MODULE,
3406                 .read =                 snd_pcm_read,
3407                 .aio_read =             snd_pcm_aio_read,
3408                 .open =                 snd_pcm_capture_open,
3409                 .release =              snd_pcm_release,
3410                 .poll =                 snd_pcm_capture_poll,
3411                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3412                 .compat_ioctl =         snd_pcm_ioctl_compat,
3413                 .mmap =                 snd_pcm_mmap,
3414                 .fasync =               snd_pcm_fasync,
3415         }
3416 };