263c01a70fdd413eeebc7dba28f98d4edf14a8fc
[linux-2.6.git] / sound / core / pcm_native.c
1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/mm.h>
24 #include <linux/smp_lock.h>
25 #include <linux/file.h>
26 #include <linux/slab.h>
27 #include <linux/time.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 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
59 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
60
61 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
62                                       struct snd_pcm_hw_params_old __user * _oparams);
63 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
64                                       struct snd_pcm_hw_params_old __user * _oparams);
65
66 /*
67  *
68  */
69
70 DEFINE_RWLOCK(snd_pcm_link_rwlock);
71 static DECLARE_RWSEM(snd_pcm_link_rwsem);
72
73
74 static inline mm_segment_t snd_enter_user(void)
75 {
76         mm_segment_t fs = get_fs();
77         set_fs(get_ds());
78         return fs;
79 }
80
81 static inline void snd_leave_user(mm_segment_t fs)
82 {
83         set_fs(fs);
84 }
85
86
87
88 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
89 {
90         struct snd_pcm_runtime *runtime;
91         struct snd_pcm *pcm = substream->pcm;
92         struct snd_pcm_str *pstr = substream->pstr;
93
94         snd_assert(substream != NULL, return -ENXIO);
95         memset(info, 0, sizeof(*info));
96         info->card = pcm->card->number;
97         info->device = pcm->device;
98         info->stream = substream->stream;
99         info->subdevice = substream->number;
100         strlcpy(info->id, pcm->id, sizeof(info->id));
101         strlcpy(info->name, pcm->name, sizeof(info->name));
102         info->dev_class = pcm->dev_class;
103         info->dev_subclass = pcm->dev_subclass;
104         info->subdevices_count = pstr->substream_count;
105         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
106         strlcpy(info->subname, substream->name, sizeof(info->subname));
107         runtime = substream->runtime;
108         /* AB: FIXME!!! This is definitely nonsense */
109         if (runtime) {
110                 info->sync = runtime->sync;
111                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
112         }
113         return 0;
114 }
115
116 int snd_pcm_info_user(struct snd_pcm_substream *substream,
117                       struct snd_pcm_info __user * _info)
118 {
119         struct snd_pcm_info *info;
120         int err;
121
122         info = kmalloc(sizeof(*info), GFP_KERNEL);
123         if (! info)
124                 return -ENOMEM;
125         err = snd_pcm_info(substream, info);
126         if (err >= 0) {
127                 if (copy_to_user(_info, info, sizeof(*info)))
128                         err = -EFAULT;
129         }
130         kfree(info);
131         return err;
132 }
133
134 #undef RULES_DEBUG
135
136 #ifdef RULES_DEBUG
137 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
138 char *snd_pcm_hw_param_names[] = {
139         HW_PARAM(ACCESS),
140         HW_PARAM(FORMAT),
141         HW_PARAM(SUBFORMAT),
142         HW_PARAM(SAMPLE_BITS),
143         HW_PARAM(FRAME_BITS),
144         HW_PARAM(CHANNELS),
145         HW_PARAM(RATE),
146         HW_PARAM(PERIOD_TIME),
147         HW_PARAM(PERIOD_SIZE),
148         HW_PARAM(PERIOD_BYTES),
149         HW_PARAM(PERIODS),
150         HW_PARAM(BUFFER_TIME),
151         HW_PARAM(BUFFER_SIZE),
152         HW_PARAM(BUFFER_BYTES),
153         HW_PARAM(TICK_TIME),
154 };
155 #endif
156
157 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
158                       struct snd_pcm_hw_params *params)
159 {
160         unsigned int k;
161         struct snd_pcm_hardware *hw;
162         struct snd_interval *i = NULL;
163         struct snd_mask *m = NULL;
164         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
165         unsigned int rstamps[constrs->rules_num];
166         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
167         unsigned int stamp = 2;
168         int changed, again;
169
170         params->info = 0;
171         params->fifo_size = 0;
172         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
173                 params->msbits = 0;
174         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
175                 params->rate_num = 0;
176                 params->rate_den = 0;
177         }
178
179         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
180                 m = hw_param_mask(params, k);
181                 if (snd_mask_empty(m))
182                         return -EINVAL;
183                 if (!(params->rmask & (1 << k)))
184                         continue;
185 #ifdef RULES_DEBUG
186                 printk("%s = ", snd_pcm_hw_param_names[k]);
187                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
188 #endif
189                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
190 #ifdef RULES_DEBUG
191                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
192 #endif
193                 if (changed)
194                         params->cmask |= 1 << k;
195                 if (changed < 0)
196                         return changed;
197         }
198
199         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
200                 i = hw_param_interval(params, k);
201                 if (snd_interval_empty(i))
202                         return -EINVAL;
203                 if (!(params->rmask & (1 << k)))
204                         continue;
205 #ifdef RULES_DEBUG
206                 printk("%s = ", snd_pcm_hw_param_names[k]);
207                 if (i->empty)
208                         printk("empty");
209                 else
210                         printk("%c%u %u%c", 
211                                i->openmin ? '(' : '[', i->min,
212                                i->max, i->openmax ? ')' : ']');
213                 printk(" -> ");
214 #endif
215                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
216 #ifdef RULES_DEBUG
217                 if (i->empty)
218                         printk("empty\n");
219                 else 
220                         printk("%c%u %u%c\n", 
221                                i->openmin ? '(' : '[', i->min,
222                                i->max, i->openmax ? ')' : ']');
223 #endif
224                 if (changed)
225                         params->cmask |= 1 << k;
226                 if (changed < 0)
227                         return changed;
228         }
229
230         for (k = 0; k < constrs->rules_num; k++)
231                 rstamps[k] = 0;
232         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
233                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
234         do {
235                 again = 0;
236                 for (k = 0; k < constrs->rules_num; k++) {
237                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
238                         unsigned int d;
239                         int doit = 0;
240                         if (r->cond && !(r->cond & params->flags))
241                                 continue;
242                         for (d = 0; r->deps[d] >= 0; d++) {
243                                 if (vstamps[r->deps[d]] > rstamps[k]) {
244                                         doit = 1;
245                                         break;
246                                 }
247                         }
248                         if (!doit)
249                                 continue;
250 #ifdef RULES_DEBUG
251                         printk("Rule %d [%p]: ", k, r->func);
252                         if (r->var >= 0) {
253                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
254                                 if (hw_is_mask(r->var)) {
255                                         m = hw_param_mask(params, r->var);
256                                         printk("%x", *m->bits);
257                                 } else {
258                                         i = hw_param_interval(params, r->var);
259                                         if (i->empty)
260                                                 printk("empty");
261                                         else
262                                                 printk("%c%u %u%c", 
263                                                        i->openmin ? '(' : '[', i->min,
264                                                        i->max, i->openmax ? ')' : ']');
265                                 }
266                         }
267 #endif
268                         changed = r->func(params, r);
269 #ifdef RULES_DEBUG
270                         if (r->var >= 0) {
271                                 printk(" -> ");
272                                 if (hw_is_mask(r->var))
273                                         printk("%x", *m->bits);
274                                 else {
275                                         if (i->empty)
276                                                 printk("empty");
277                                         else
278                                                 printk("%c%u %u%c", 
279                                                        i->openmin ? '(' : '[', i->min,
280                                                        i->max, i->openmax ? ')' : ']');
281                                 }
282                         }
283                         printk("\n");
284 #endif
285                         rstamps[k] = stamp;
286                         if (changed && r->var >= 0) {
287                                 params->cmask |= (1 << r->var);
288                                 vstamps[r->var] = stamp;
289                                 again = 1;
290                         }
291                         if (changed < 0)
292                                 return changed;
293                         stamp++;
294                 }
295         } while (again);
296         if (!params->msbits) {
297                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
298                 if (snd_interval_single(i))
299                         params->msbits = snd_interval_value(i);
300         }
301
302         if (!params->rate_den) {
303                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
304                 if (snd_interval_single(i)) {
305                         params->rate_num = snd_interval_value(i);
306                         params->rate_den = 1;
307                 }
308         }
309
310         hw = &substream->runtime->hw;
311         if (!params->info)
312                 params->info = hw->info;
313         if (!params->fifo_size)
314                 params->fifo_size = hw->fifo_size;
315         params->rmask = 0;
316         return 0;
317 }
318
319 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
320                                   struct snd_pcm_hw_params __user * _params)
321 {
322         struct snd_pcm_hw_params *params;
323         int err;
324
325         params = kmalloc(sizeof(*params), GFP_KERNEL);
326         if (!params) {
327                 err = -ENOMEM;
328                 goto out;
329         }
330         if (copy_from_user(params, _params, sizeof(*params))) {
331                 err = -EFAULT;
332                 goto out;
333         }
334         err = snd_pcm_hw_refine(substream, params);
335         if (copy_to_user(_params, params, sizeof(*params))) {
336                 if (!err)
337                         err = -EFAULT;
338         }
339 out:
340         kfree(params);
341         return err;
342 }
343
344 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
345                              struct snd_pcm_hw_params *params)
346 {
347         struct snd_pcm_runtime *runtime;
348         int err;
349         unsigned int bits;
350         snd_pcm_uframes_t frames;
351
352         snd_assert(substream != NULL, return -ENXIO);
353         runtime = substream->runtime;
354         snd_assert(runtime != NULL, return -ENXIO);
355         snd_pcm_stream_lock_irq(substream);
356         switch (runtime->status->state) {
357         case SNDRV_PCM_STATE_OPEN:
358         case SNDRV_PCM_STATE_SETUP:
359         case SNDRV_PCM_STATE_PREPARED:
360                 break;
361         default:
362                 snd_pcm_stream_unlock_irq(substream);
363                 return -EBADFD;
364         }
365         snd_pcm_stream_unlock_irq(substream);
366 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
367         if (!substream->oss.oss)
368 #endif
369                 if (atomic_read(&runtime->mmap_count))
370                         return -EBADFD;
371
372         params->rmask = ~0U;
373         err = snd_pcm_hw_refine(substream, params);
374         if (err < 0)
375                 goto _error;
376
377         err = snd_pcm_hw_params_choose(substream, params);
378         if (err < 0)
379                 goto _error;
380
381         if (substream->ops->hw_params != NULL) {
382                 err = substream->ops->hw_params(substream, params);
383                 if (err < 0)
384                         goto _error;
385         }
386
387         runtime->access = params_access(params);
388         runtime->format = params_format(params);
389         runtime->subformat = params_subformat(params);
390         runtime->channels = params_channels(params);
391         runtime->rate = params_rate(params);
392         runtime->period_size = params_period_size(params);
393         runtime->periods = params_periods(params);
394         runtime->buffer_size = params_buffer_size(params);
395         runtime->tick_time = params_tick_time(params);
396         runtime->info = params->info;
397         runtime->rate_num = params->rate_num;
398         runtime->rate_den = params->rate_den;
399
400         bits = snd_pcm_format_physical_width(runtime->format);
401         runtime->sample_bits = bits;
402         bits *= runtime->channels;
403         runtime->frame_bits = bits;
404         frames = 1;
405         while (bits % 8 != 0) {
406                 bits *= 2;
407                 frames *= 2;
408         }
409         runtime->byte_align = bits / 8;
410         runtime->min_align = frames;
411
412         /* Default sw params */
413         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
414         runtime->period_step = 1;
415         runtime->sleep_min = 0;
416         runtime->control->avail_min = runtime->period_size;
417         runtime->xfer_align = runtime->period_size;
418         runtime->start_threshold = 1;
419         runtime->stop_threshold = runtime->buffer_size;
420         runtime->silence_threshold = 0;
421         runtime->silence_size = 0;
422         runtime->boundary = runtime->buffer_size;
423         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
424                 runtime->boundary *= 2;
425
426         snd_pcm_timer_resolution_change(substream);
427         runtime->status->state = SNDRV_PCM_STATE_SETUP;
428         return 0;
429  _error:
430         /* hardware might be unuseable from this time,
431            so we force application to retry to set
432            the correct hardware parameter settings */
433         runtime->status->state = SNDRV_PCM_STATE_OPEN;
434         if (substream->ops->hw_free != NULL)
435                 substream->ops->hw_free(substream);
436         return err;
437 }
438
439 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
440                                   struct snd_pcm_hw_params __user * _params)
441 {
442         struct snd_pcm_hw_params *params;
443         int err;
444
445         params = kmalloc(sizeof(*params), GFP_KERNEL);
446         if (!params) {
447                 err = -ENOMEM;
448                 goto out;
449         }
450         if (copy_from_user(params, _params, sizeof(*params))) {
451                 err = -EFAULT;
452                 goto out;
453         }
454         err = snd_pcm_hw_params(substream, params);
455         if (copy_to_user(_params, params, sizeof(*params))) {
456                 if (!err)
457                         err = -EFAULT;
458         }
459 out:
460         kfree(params);
461         return err;
462 }
463
464 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
465 {
466         struct snd_pcm_runtime *runtime;
467         int result = 0;
468
469         snd_assert(substream != NULL, return -ENXIO);
470         runtime = substream->runtime;
471         snd_assert(runtime != NULL, return -ENXIO);
472         snd_pcm_stream_lock_irq(substream);
473         switch (runtime->status->state) {
474         case SNDRV_PCM_STATE_SETUP:
475         case SNDRV_PCM_STATE_PREPARED:
476                 break;
477         default:
478                 snd_pcm_stream_unlock_irq(substream);
479                 return -EBADFD;
480         }
481         snd_pcm_stream_unlock_irq(substream);
482         if (atomic_read(&runtime->mmap_count))
483                 return -EBADFD;
484         if (substream->ops->hw_free)
485                 result = substream->ops->hw_free(substream);
486         runtime->status->state = SNDRV_PCM_STATE_OPEN;
487         return result;
488 }
489
490 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
491                              struct snd_pcm_sw_params *params)
492 {
493         struct snd_pcm_runtime *runtime;
494
495         snd_assert(substream != NULL, return -ENXIO);
496         runtime = substream->runtime;
497         snd_assert(runtime != NULL, return -ENXIO);
498         snd_pcm_stream_lock_irq(substream);
499         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
500                 snd_pcm_stream_unlock_irq(substream);
501                 return -EBADFD;
502         }
503         snd_pcm_stream_unlock_irq(substream);
504
505         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
506                 return -EINVAL;
507         if (params->avail_min == 0)
508                 return -EINVAL;
509         if (params->xfer_align == 0 ||
510             params->xfer_align % runtime->min_align != 0)
511                 return -EINVAL;
512         if (params->silence_size >= runtime->boundary) {
513                 if (params->silence_threshold != 0)
514                         return -EINVAL;
515         } else {
516                 if (params->silence_size > params->silence_threshold)
517                         return -EINVAL;
518                 if (params->silence_threshold > runtime->buffer_size)
519                         return -EINVAL;
520         }
521         snd_pcm_stream_lock_irq(substream);
522         runtime->tstamp_mode = params->tstamp_mode;
523         runtime->sleep_min = params->sleep_min;
524         runtime->period_step = params->period_step;
525         runtime->control->avail_min = params->avail_min;
526         runtime->start_threshold = params->start_threshold;
527         runtime->stop_threshold = params->stop_threshold;
528         runtime->silence_threshold = params->silence_threshold;
529         runtime->silence_size = params->silence_size;
530         runtime->xfer_align = params->xfer_align;
531         params->boundary = runtime->boundary;
532         if (snd_pcm_running(substream)) {
533                 if (runtime->sleep_min)
534                         snd_pcm_tick_prepare(substream);
535                 else
536                         snd_pcm_tick_set(substream, 0);
537                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
538                     runtime->silence_size > 0)
539                         snd_pcm_playback_silence(substream, ULONG_MAX);
540                 wake_up(&runtime->sleep);
541         }
542         snd_pcm_stream_unlock_irq(substream);
543         return 0;
544 }
545
546 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
547                                   struct snd_pcm_sw_params __user * _params)
548 {
549         struct snd_pcm_sw_params params;
550         int err;
551         if (copy_from_user(&params, _params, sizeof(params)))
552                 return -EFAULT;
553         err = snd_pcm_sw_params(substream, &params);
554         if (copy_to_user(_params, &params, sizeof(params)))
555                 return -EFAULT;
556         return err;
557 }
558
559 int snd_pcm_status(struct snd_pcm_substream *substream,
560                    struct snd_pcm_status *status)
561 {
562         struct snd_pcm_runtime *runtime = substream->runtime;
563
564         snd_pcm_stream_lock_irq(substream);
565         status->state = runtime->status->state;
566         status->suspended_state = runtime->status->suspended_state;
567         if (status->state == SNDRV_PCM_STATE_OPEN)
568                 goto _end;
569         status->trigger_tstamp = runtime->trigger_tstamp;
570         if (snd_pcm_running(substream)) {
571                 snd_pcm_update_hw_ptr(substream);
572                 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
573                         status->tstamp = runtime->status->tstamp;
574                 else
575                         getnstimeofday(&status->tstamp);
576         } else
577                 getnstimeofday(&status->tstamp);
578         status->appl_ptr = runtime->control->appl_ptr;
579         status->hw_ptr = runtime->status->hw_ptr;
580         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
581                 status->avail = snd_pcm_playback_avail(runtime);
582                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
583                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
584                         status->delay = runtime->buffer_size - status->avail;
585                 else
586                         status->delay = 0;
587         } else {
588                 status->avail = snd_pcm_capture_avail(runtime);
589                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
590                         status->delay = status->avail;
591                 else
592                         status->delay = 0;
593         }
594         status->avail_max = runtime->avail_max;
595         status->overrange = runtime->overrange;
596         runtime->avail_max = 0;
597         runtime->overrange = 0;
598  _end:
599         snd_pcm_stream_unlock_irq(substream);
600         return 0;
601 }
602
603 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
604                                struct snd_pcm_status __user * _status)
605 {
606         struct snd_pcm_status status;
607         struct snd_pcm_runtime *runtime;
608         int res;
609         
610         snd_assert(substream != NULL, return -ENXIO);
611         runtime = substream->runtime;
612         memset(&status, 0, sizeof(status));
613         res = snd_pcm_status(substream, &status);
614         if (res < 0)
615                 return res;
616         if (copy_to_user(_status, &status, sizeof(status)))
617                 return -EFAULT;
618         return 0;
619 }
620
621 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
622                                 struct snd_pcm_channel_info * info)
623 {
624         struct snd_pcm_runtime *runtime;
625         unsigned int channel;
626         
627         snd_assert(substream != NULL, return -ENXIO);
628         channel = info->channel;
629         runtime = substream->runtime;
630         snd_pcm_stream_lock_irq(substream);
631         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
632                 snd_pcm_stream_unlock_irq(substream);
633                 return -EBADFD;
634         }
635         snd_pcm_stream_unlock_irq(substream);
636         if (channel >= runtime->channels)
637                 return -EINVAL;
638         memset(info, 0, sizeof(*info));
639         info->channel = channel;
640         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
641 }
642
643 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
644                                      struct snd_pcm_channel_info __user * _info)
645 {
646         struct snd_pcm_channel_info info;
647         int res;
648         
649         if (copy_from_user(&info, _info, sizeof(info)))
650                 return -EFAULT;
651         res = snd_pcm_channel_info(substream, &info);
652         if (res < 0)
653                 return res;
654         if (copy_to_user(_info, &info, sizeof(info)))
655                 return -EFAULT;
656         return 0;
657 }
658
659 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
660 {
661         struct snd_pcm_runtime *runtime = substream->runtime;
662         if (runtime->trigger_master == NULL)
663                 return;
664         if (runtime->trigger_master == substream) {
665                 getnstimeofday(&runtime->trigger_tstamp);
666         } else {
667                 snd_pcm_trigger_tstamp(runtime->trigger_master);
668                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
669         }
670         runtime->trigger_master = NULL;
671 }
672
673 struct action_ops {
674         int (*pre_action)(struct snd_pcm_substream *substream, int state);
675         int (*do_action)(struct snd_pcm_substream *substream, int state);
676         void (*undo_action)(struct snd_pcm_substream *substream, int state);
677         void (*post_action)(struct snd_pcm_substream *substream, int state);
678 };
679
680 /*
681  *  this functions is core for handling of linked stream
682  *  Note: the stream state might be changed also on failure
683  *  Note2: call with calling stream lock + link lock
684  */
685 static int snd_pcm_action_group(struct action_ops *ops,
686                                 struct snd_pcm_substream *substream,
687                                 int state, int do_lock)
688 {
689         struct list_head *pos;
690         struct snd_pcm_substream *s = NULL;
691         struct snd_pcm_substream *s1;
692         int res = 0;
693
694         snd_pcm_group_for_each(pos, substream) {
695                 s = snd_pcm_group_substream_entry(pos);
696                 if (do_lock && s != substream)
697                         spin_lock(&s->self_group.lock);
698                 res = ops->pre_action(s, state);
699                 if (res < 0)
700                         goto _unlock;
701         }
702         snd_pcm_group_for_each(pos, substream) {
703                 s = snd_pcm_group_substream_entry(pos);
704                 res = ops->do_action(s, state);
705                 if (res < 0) {
706                         if (ops->undo_action) {
707                                 snd_pcm_group_for_each(pos, substream) {
708                                         s1 = snd_pcm_group_substream_entry(pos);
709                                         if (s1 == s) /* failed stream */
710                                                 break;
711                                         ops->undo_action(s1, state);
712                                 }
713                         }
714                         s = NULL; /* unlock all */
715                         goto _unlock;
716                 }
717         }
718         snd_pcm_group_for_each(pos, substream) {
719                 s = snd_pcm_group_substream_entry(pos);
720                 ops->post_action(s, state);
721         }
722  _unlock:
723         if (do_lock) {
724                 /* unlock streams */
725                 snd_pcm_group_for_each(pos, substream) {
726                         s1 = snd_pcm_group_substream_entry(pos);
727                         if (s1 != substream)
728                                 spin_unlock(&s1->self_group.lock);
729                         if (s1 == s)    /* end */
730                                 break;
731                 }
732         }
733         return res;
734 }
735
736 /*
737  *  Note: call with stream lock
738  */
739 static int snd_pcm_action_single(struct action_ops *ops,
740                                  struct snd_pcm_substream *substream,
741                                  int state)
742 {
743         int res;
744         
745         res = ops->pre_action(substream, state);
746         if (res < 0)
747                 return res;
748         res = ops->do_action(substream, state);
749         if (res == 0)
750                 ops->post_action(substream, state);
751         else if (ops->undo_action)
752                 ops->undo_action(substream, state);
753         return res;
754 }
755
756 /*
757  *  Note: call with stream lock
758  */
759 static int snd_pcm_action(struct action_ops *ops,
760                           struct snd_pcm_substream *substream,
761                           int state)
762 {
763         int res;
764
765         if (snd_pcm_stream_linked(substream)) {
766                 if (!spin_trylock(&substream->group->lock)) {
767                         spin_unlock(&substream->self_group.lock);
768                         spin_lock(&substream->group->lock);
769                         spin_lock(&substream->self_group.lock);
770                 }
771                 res = snd_pcm_action_group(ops, substream, state, 1);
772                 spin_unlock(&substream->group->lock);
773         } else {
774                 res = snd_pcm_action_single(ops, substream, state);
775         }
776         return res;
777 }
778
779 /*
780  *  Note: don't use any locks before
781  */
782 static int snd_pcm_action_lock_irq(struct action_ops *ops,
783                                    struct snd_pcm_substream *substream,
784                                    int state)
785 {
786         int res;
787
788         read_lock_irq(&snd_pcm_link_rwlock);
789         if (snd_pcm_stream_linked(substream)) {
790                 spin_lock(&substream->group->lock);
791                 spin_lock(&substream->self_group.lock);
792                 res = snd_pcm_action_group(ops, substream, state, 1);
793                 spin_unlock(&substream->self_group.lock);
794                 spin_unlock(&substream->group->lock);
795         } else {
796                 spin_lock(&substream->self_group.lock);
797                 res = snd_pcm_action_single(ops, substream, state);
798                 spin_unlock(&substream->self_group.lock);
799         }
800         read_unlock_irq(&snd_pcm_link_rwlock);
801         return res;
802 }
803
804 /*
805  */
806 static int snd_pcm_action_nonatomic(struct action_ops *ops,
807                                     struct snd_pcm_substream *substream,
808                                     int state)
809 {
810         int res;
811
812         down_read(&snd_pcm_link_rwsem);
813         if (snd_pcm_stream_linked(substream))
814                 res = snd_pcm_action_group(ops, substream, state, 0);
815         else
816                 res = snd_pcm_action_single(ops, substream, state);
817         up_read(&snd_pcm_link_rwsem);
818         return res;
819 }
820
821 /*
822  * start callbacks
823  */
824 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
825 {
826         struct snd_pcm_runtime *runtime = substream->runtime;
827         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
828                 return -EBADFD;
829         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
830             !snd_pcm_playback_data(substream))
831                 return -EPIPE;
832         runtime->trigger_master = substream;
833         return 0;
834 }
835
836 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
837 {
838         if (substream->runtime->trigger_master != substream)
839                 return 0;
840         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
841 }
842
843 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
844 {
845         if (substream->runtime->trigger_master == substream)
846                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
847 }
848
849 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
850 {
851         struct snd_pcm_runtime *runtime = substream->runtime;
852         snd_pcm_trigger_tstamp(substream);
853         runtime->status->state = state;
854         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
855             runtime->silence_size > 0)
856                 snd_pcm_playback_silence(substream, ULONG_MAX);
857         if (runtime->sleep_min)
858                 snd_pcm_tick_prepare(substream);
859         if (substream->timer)
860                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
861                                  &runtime->trigger_tstamp);
862 }
863
864 static struct action_ops snd_pcm_action_start = {
865         .pre_action = snd_pcm_pre_start,
866         .do_action = snd_pcm_do_start,
867         .undo_action = snd_pcm_undo_start,
868         .post_action = snd_pcm_post_start
869 };
870
871 /**
872  * snd_pcm_start
873  * @substream: the PCM substream instance
874  *
875  * Start all linked streams.
876  */
877 int snd_pcm_start(struct snd_pcm_substream *substream)
878 {
879         return snd_pcm_action(&snd_pcm_action_start, substream,
880                               SNDRV_PCM_STATE_RUNNING);
881 }
882
883 /*
884  * stop callbacks
885  */
886 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
887 {
888         struct snd_pcm_runtime *runtime = substream->runtime;
889         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
890                 return -EBADFD;
891         runtime->trigger_master = substream;
892         return 0;
893 }
894
895 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
896 {
897         if (substream->runtime->trigger_master == substream &&
898             snd_pcm_running(substream))
899                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
900         return 0; /* unconditonally stop all substreams */
901 }
902
903 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
904 {
905         struct snd_pcm_runtime *runtime = substream->runtime;
906         if (runtime->status->state != state) {
907                 snd_pcm_trigger_tstamp(substream);
908                 if (substream->timer)
909                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
910                                          &runtime->trigger_tstamp);
911                 runtime->status->state = state;
912                 snd_pcm_tick_set(substream, 0);
913         }
914         wake_up(&runtime->sleep);
915 }
916
917 static struct action_ops snd_pcm_action_stop = {
918         .pre_action = snd_pcm_pre_stop,
919         .do_action = snd_pcm_do_stop,
920         .post_action = snd_pcm_post_stop
921 };
922
923 /**
924  * snd_pcm_stop
925  * @substream: the PCM substream instance
926  * @state: PCM state after stopping the stream
927  *
928  * Try to stop all running streams in the substream group.
929  * The state of each stream is changed to the given value after that unconditionally.
930  */
931 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
932 {
933         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
934 }
935
936 /**
937  * snd_pcm_drain_done
938  * @substream: the PCM substream
939  *
940  * Stop the DMA only when the given stream is playback.
941  * The state is changed to SETUP.
942  * Unlike snd_pcm_stop(), this affects only the given stream.
943  */
944 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
945 {
946         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
947                                      SNDRV_PCM_STATE_SETUP);
948 }
949
950 /*
951  * pause callbacks
952  */
953 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
954 {
955         struct snd_pcm_runtime *runtime = substream->runtime;
956         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
957                 return -ENOSYS;
958         if (push) {
959                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
960                         return -EBADFD;
961         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
962                 return -EBADFD;
963         runtime->trigger_master = substream;
964         return 0;
965 }
966
967 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
968 {
969         if (substream->runtime->trigger_master != substream)
970                 return 0;
971         return substream->ops->trigger(substream,
972                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
973                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
974 }
975
976 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
977 {
978         if (substream->runtime->trigger_master == substream)
979                 substream->ops->trigger(substream,
980                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
981                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
982 }
983
984 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
985 {
986         struct snd_pcm_runtime *runtime = substream->runtime;
987         snd_pcm_trigger_tstamp(substream);
988         if (push) {
989                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
990                 if (substream->timer)
991                         snd_timer_notify(substream->timer,
992                                          SNDRV_TIMER_EVENT_MPAUSE,
993                                          &runtime->trigger_tstamp);
994                 snd_pcm_tick_set(substream, 0);
995                 wake_up(&runtime->sleep);
996         } else {
997                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
998                 if (runtime->sleep_min)
999                         snd_pcm_tick_prepare(substream);
1000                 if (substream->timer)
1001                         snd_timer_notify(substream->timer,
1002                                          SNDRV_TIMER_EVENT_MCONTINUE,
1003                                          &runtime->trigger_tstamp);
1004         }
1005 }
1006
1007 static struct action_ops snd_pcm_action_pause = {
1008         .pre_action = snd_pcm_pre_pause,
1009         .do_action = snd_pcm_do_pause,
1010         .undo_action = snd_pcm_undo_pause,
1011         .post_action = snd_pcm_post_pause
1012 };
1013
1014 /*
1015  * Push/release the pause for all linked streams.
1016  */
1017 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1018 {
1019         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1020 }
1021
1022 #ifdef CONFIG_PM
1023 /* suspend */
1024
1025 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1026 {
1027         struct snd_pcm_runtime *runtime = substream->runtime;
1028         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1029                 return -EBUSY;
1030         runtime->trigger_master = substream;
1031         return 0;
1032 }
1033
1034 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1035 {
1036         struct snd_pcm_runtime *runtime = substream->runtime;
1037         if (runtime->trigger_master != substream)
1038                 return 0;
1039         if (! snd_pcm_running(substream))
1040                 return 0;
1041         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1042         return 0; /* suspend unconditionally */
1043 }
1044
1045 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1046 {
1047         struct snd_pcm_runtime *runtime = substream->runtime;
1048         snd_pcm_trigger_tstamp(substream);
1049         if (substream->timer)
1050                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1051                                  &runtime->trigger_tstamp);
1052         runtime->status->suspended_state = runtime->status->state;
1053         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1054         snd_pcm_tick_set(substream, 0);
1055         wake_up(&runtime->sleep);
1056 }
1057
1058 static struct action_ops snd_pcm_action_suspend = {
1059         .pre_action = snd_pcm_pre_suspend,
1060         .do_action = snd_pcm_do_suspend,
1061         .post_action = snd_pcm_post_suspend
1062 };
1063
1064 /**
1065  * snd_pcm_suspend
1066  * @substream: the PCM substream
1067  *
1068  * Trigger SUSPEND to all linked streams.
1069  * After this call, all streams are changed to SUSPENDED state.
1070  */
1071 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1072 {
1073         int err;
1074         unsigned long flags;
1075
1076         snd_pcm_stream_lock_irqsave(substream, flags);
1077         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1078         snd_pcm_stream_unlock_irqrestore(substream, flags);
1079         return err;
1080 }
1081
1082 /**
1083  * snd_pcm_suspend_all
1084  * @pcm: the PCM instance
1085  *
1086  * Trigger SUSPEND to all substreams in the given pcm.
1087  * After this call, all streams are changed to SUSPENDED state.
1088  */
1089 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1090 {
1091         struct snd_pcm_substream *substream;
1092         int stream, err = 0;
1093
1094         for (stream = 0; stream < 2; stream++) {
1095                 for (substream = pcm->streams[stream].substream;
1096                      substream; substream = substream->next) {
1097                         /* FIXME: the open/close code should lock this as well */
1098                         if (substream->runtime == NULL)
1099                                 continue;
1100                         err = snd_pcm_suspend(substream);
1101                         if (err < 0 && err != -EBUSY)
1102                                 return err;
1103                 }
1104         }
1105         return 0;
1106 }
1107
1108 /* resume */
1109
1110 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1111 {
1112         struct snd_pcm_runtime *runtime = substream->runtime;
1113         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1114                 return -ENOSYS;
1115         runtime->trigger_master = substream;
1116         return 0;
1117 }
1118
1119 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1120 {
1121         struct snd_pcm_runtime *runtime = substream->runtime;
1122         if (runtime->trigger_master != substream)
1123                 return 0;
1124         /* DMA not running previously? */
1125         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1126             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1127              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1128                 return 0;
1129         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1130 }
1131
1132 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1133 {
1134         if (substream->runtime->trigger_master == substream &&
1135             snd_pcm_running(substream))
1136                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1137 }
1138
1139 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1140 {
1141         struct snd_pcm_runtime *runtime = substream->runtime;
1142         snd_pcm_trigger_tstamp(substream);
1143         if (substream->timer)
1144                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1145                                  &runtime->trigger_tstamp);
1146         runtime->status->state = runtime->status->suspended_state;
1147         if (runtime->sleep_min)
1148                 snd_pcm_tick_prepare(substream);
1149 }
1150
1151 static struct action_ops snd_pcm_action_resume = {
1152         .pre_action = snd_pcm_pre_resume,
1153         .do_action = snd_pcm_do_resume,
1154         .undo_action = snd_pcm_undo_resume,
1155         .post_action = snd_pcm_post_resume
1156 };
1157
1158 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1159 {
1160         struct snd_card *card = substream->pcm->card;
1161         int res;
1162
1163         snd_power_lock(card);
1164         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile)) >= 0)
1165                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1166         snd_power_unlock(card);
1167         return res;
1168 }
1169
1170 #else
1171
1172 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1173 {
1174         return -ENOSYS;
1175 }
1176
1177 #endif /* CONFIG_PM */
1178
1179 /*
1180  * xrun ioctl
1181  *
1182  * Change the RUNNING stream(s) to XRUN state.
1183  */
1184 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1185 {
1186         struct snd_card *card = substream->pcm->card;
1187         struct snd_pcm_runtime *runtime = substream->runtime;
1188         int result;
1189
1190         snd_power_lock(card);
1191         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1192                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile);
1193                 if (result < 0)
1194                         goto _unlock;
1195         }
1196
1197         snd_pcm_stream_lock_irq(substream);
1198         switch (runtime->status->state) {
1199         case SNDRV_PCM_STATE_XRUN:
1200                 result = 0;     /* already there */
1201                 break;
1202         case SNDRV_PCM_STATE_RUNNING:
1203                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1204                 break;
1205         default:
1206                 result = -EBADFD;
1207         }
1208         snd_pcm_stream_unlock_irq(substream);
1209  _unlock:
1210         snd_power_unlock(card);
1211         return result;
1212 }
1213
1214 /*
1215  * reset ioctl
1216  */
1217 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1218 {
1219         struct snd_pcm_runtime *runtime = substream->runtime;
1220         switch (runtime->status->state) {
1221         case SNDRV_PCM_STATE_RUNNING:
1222         case SNDRV_PCM_STATE_PREPARED:
1223         case SNDRV_PCM_STATE_PAUSED:
1224         case SNDRV_PCM_STATE_SUSPENDED:
1225                 return 0;
1226         default:
1227                 return -EBADFD;
1228         }
1229 }
1230
1231 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1232 {
1233         struct snd_pcm_runtime *runtime = substream->runtime;
1234         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1235         if (err < 0)
1236                 return err;
1237         // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1238         runtime->hw_ptr_base = 0;
1239         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1240                 runtime->status->hw_ptr % runtime->period_size;
1241         runtime->silence_start = runtime->status->hw_ptr;
1242         runtime->silence_filled = 0;
1243         return 0;
1244 }
1245
1246 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1247 {
1248         struct snd_pcm_runtime *runtime = substream->runtime;
1249         runtime->control->appl_ptr = runtime->status->hw_ptr;
1250         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1251             runtime->silence_size > 0)
1252                 snd_pcm_playback_silence(substream, ULONG_MAX);
1253 }
1254
1255 static struct action_ops snd_pcm_action_reset = {
1256         .pre_action = snd_pcm_pre_reset,
1257         .do_action = snd_pcm_do_reset,
1258         .post_action = snd_pcm_post_reset
1259 };
1260
1261 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1262 {
1263         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1264 }
1265
1266 /*
1267  * prepare ioctl
1268  */
1269 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, int state)
1270 {
1271         struct snd_pcm_runtime *runtime = substream->runtime;
1272         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1273                 return -EBADFD;
1274         if (snd_pcm_running(substream))
1275                 return -EBUSY;
1276         return 0;
1277 }
1278
1279 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1280 {
1281         int err;
1282         err = substream->ops->prepare(substream);
1283         if (err < 0)
1284                 return err;
1285         return snd_pcm_do_reset(substream, 0);
1286 }
1287
1288 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1289 {
1290         struct snd_pcm_runtime *runtime = substream->runtime;
1291         runtime->control->appl_ptr = runtime->status->hw_ptr;
1292         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1293 }
1294
1295 static struct action_ops snd_pcm_action_prepare = {
1296         .pre_action = snd_pcm_pre_prepare,
1297         .do_action = snd_pcm_do_prepare,
1298         .post_action = snd_pcm_post_prepare
1299 };
1300
1301 /**
1302  * snd_pcm_prepare
1303  * @substream: the PCM substream instance
1304  *
1305  * Prepare the PCM substream to be triggerable.
1306  */
1307 int snd_pcm_prepare(struct snd_pcm_substream *substream)
1308 {
1309         int res;
1310         struct snd_card *card = substream->pcm->card;
1311
1312         snd_power_lock(card);
1313         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile)) >= 0)
1314                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, substream, 0);
1315         snd_power_unlock(card);
1316         return res;
1317 }
1318
1319 /*
1320  * drain ioctl
1321  */
1322
1323 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1324 {
1325         if (substream->ffile->f_flags & O_NONBLOCK)
1326                 return -EAGAIN;
1327         substream->runtime->trigger_master = substream;
1328         return 0;
1329 }
1330
1331 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1332 {
1333         struct snd_pcm_runtime *runtime = substream->runtime;
1334         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1335                 switch (runtime->status->state) {
1336                 case SNDRV_PCM_STATE_PREPARED:
1337                         /* start playback stream if possible */
1338                         if (! snd_pcm_playback_empty(substream)) {
1339                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1340                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1341                         }
1342                         break;
1343                 case SNDRV_PCM_STATE_RUNNING:
1344                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1345                         break;
1346                 default:
1347                         break;
1348                 }
1349         } else {
1350                 /* stop running stream */
1351                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1352                         int state = snd_pcm_capture_avail(runtime) > 0 ?
1353                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1354                         snd_pcm_do_stop(substream, state);
1355                         snd_pcm_post_stop(substream, state);
1356                 }
1357         }
1358         return 0;
1359 }
1360
1361 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1362 {
1363 }
1364
1365 static struct action_ops snd_pcm_action_drain_init = {
1366         .pre_action = snd_pcm_pre_drain_init,
1367         .do_action = snd_pcm_do_drain_init,
1368         .post_action = snd_pcm_post_drain_init
1369 };
1370
1371 struct drain_rec {
1372         struct snd_pcm_substream *substream;
1373         wait_queue_t wait;
1374         snd_pcm_uframes_t stop_threshold;
1375 };
1376
1377 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1378
1379 /*
1380  * Drain the stream(s).
1381  * When the substream is linked, sync until the draining of all playback streams
1382  * is finished.
1383  * After this call, all streams are supposed to be either SETUP or DRAINING
1384  * (capture only) state.
1385  */
1386 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1387 {
1388         struct snd_card *card;
1389         struct snd_pcm_runtime *runtime;
1390         struct list_head *pos;
1391         int result = 0;
1392         int i, num_drecs;
1393         struct drain_rec *drec, drec_tmp, *d;
1394
1395         snd_assert(substream != NULL, return -ENXIO);
1396         card = substream->pcm->card;
1397         runtime = substream->runtime;
1398
1399         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1400                 return -EBADFD;
1401
1402         snd_power_lock(card);
1403         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1404                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile);
1405                 if (result < 0) {
1406                         snd_power_unlock(card);
1407                         return result;
1408                 }
1409         }
1410
1411         /* allocate temporary record for drain sync */
1412         down_read(&snd_pcm_link_rwsem);
1413         if (snd_pcm_stream_linked(substream)) {
1414                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1415                 if (! drec) {
1416                         up_read(&snd_pcm_link_rwsem);
1417                         snd_power_unlock(card);
1418                         return -ENOMEM;
1419                 }
1420         } else
1421                 drec = &drec_tmp;
1422
1423         /* count only playback streams */
1424         num_drecs = 0;
1425         snd_pcm_group_for_each(pos, substream) {
1426                 struct snd_pcm_substream *s = snd_pcm_group_substream_entry(pos);
1427                 runtime = s->runtime;
1428                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1429                         d = &drec[num_drecs++];
1430                         d->substream = s;
1431                         init_waitqueue_entry(&d->wait, current);
1432                         add_wait_queue(&runtime->sleep, &d->wait);
1433                         /* stop_threshold fixup to avoid endless loop when
1434                          * stop_threshold > buffer_size
1435                          */
1436                         d->stop_threshold = runtime->stop_threshold;
1437                         if (runtime->stop_threshold > runtime->buffer_size)
1438                                 runtime->stop_threshold = runtime->buffer_size;
1439                 }
1440         }
1441         up_read(&snd_pcm_link_rwsem);
1442         if (! num_drecs)
1443                 goto _error;
1444
1445         snd_pcm_stream_lock_irq(substream);
1446         /* resume pause */
1447         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1448                 snd_pcm_pause(substream, 0);
1449
1450         /* pre-start/stop - all running streams are changed to DRAINING state */
1451         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1452         if (result < 0) {
1453                 snd_pcm_stream_unlock_irq(substream);
1454                 goto _error;
1455         }
1456
1457         for (;;) {
1458                 long tout;
1459                 if (signal_pending(current)) {
1460                         result = -ERESTARTSYS;
1461                         break;
1462                 }
1463                 /* all finished? */
1464                 for (i = 0; i < num_drecs; i++) {
1465                         runtime = drec[i].substream->runtime;
1466                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1467                                 break;
1468                 }
1469                 if (i == num_drecs)
1470                         break; /* yes, all drained */
1471
1472                 set_current_state(TASK_INTERRUPTIBLE);
1473                 snd_pcm_stream_unlock_irq(substream);
1474                 snd_power_unlock(card);
1475                 tout = schedule_timeout(10 * HZ);
1476                 snd_power_lock(card);
1477                 snd_pcm_stream_lock_irq(substream);
1478                 if (tout == 0) {
1479                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1480                                 result = -ESTRPIPE;
1481                         else {
1482                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1483                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1484                                 result = -EIO;
1485                         }
1486                         break;
1487                 }
1488         }
1489
1490         snd_pcm_stream_unlock_irq(substream);
1491
1492  _error:
1493         for (i = 0; i < num_drecs; i++) {
1494                 d = &drec[i];
1495                 runtime = d->substream->runtime;
1496                 remove_wait_queue(&runtime->sleep, &d->wait);
1497                 runtime->stop_threshold = d->stop_threshold;
1498         }
1499
1500         if (drec != &drec_tmp)
1501                 kfree(drec);
1502         snd_power_unlock(card);
1503
1504         return result;
1505 }
1506
1507 /*
1508  * drop ioctl
1509  *
1510  * Immediately put all linked substreams into SETUP state.
1511  */
1512 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1513 {
1514         struct snd_pcm_runtime *runtime;
1515         struct snd_card *card;
1516         int result = 0;
1517         
1518         snd_assert(substream != NULL, return -ENXIO);
1519         runtime = substream->runtime;
1520         card = substream->pcm->card;
1521
1522         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1523                 return -EBADFD;
1524
1525         snd_power_lock(card);
1526         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1527                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0, substream->ffile);
1528                 if (result < 0)
1529                         goto _unlock;
1530         }
1531
1532         snd_pcm_stream_lock_irq(substream);
1533         /* resume pause */
1534         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1535                 snd_pcm_pause(substream, 0);
1536
1537         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1538         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1539         snd_pcm_stream_unlock_irq(substream);
1540  _unlock:
1541         snd_power_unlock(card);
1542         return result;
1543 }
1544
1545
1546 /* WARNING: Don't forget to fput back the file */
1547 static struct file *snd_pcm_file_fd(int fd)
1548 {
1549         struct file *file;
1550         struct inode *inode;
1551         unsigned short minor;
1552         file = fget(fd);
1553         if (!file)
1554                 return NULL;
1555         inode = file->f_dentry->d_inode;
1556         if (!S_ISCHR(inode->i_mode) ||
1557             imajor(inode) != snd_major) {
1558                 fput(file);
1559                 return NULL;
1560         }
1561         minor = iminor(inode);
1562         if (minor >= 256 || 
1563             minor % SNDRV_MINOR_DEVICES < SNDRV_MINOR_PCM_PLAYBACK) {
1564                 fput(file);
1565                 return NULL;
1566         }
1567         return file;
1568 }
1569
1570 /*
1571  * PCM link handling
1572  */
1573 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1574 {
1575         int res = 0;
1576         struct file *file;
1577         struct snd_pcm_file *pcm_file;
1578         struct snd_pcm_substream *substream1;
1579
1580         file = snd_pcm_file_fd(fd);
1581         if (!file)
1582                 return -EBADFD;
1583         pcm_file = file->private_data;
1584         substream1 = pcm_file->substream;
1585         down_write(&snd_pcm_link_rwsem);
1586         write_lock_irq(&snd_pcm_link_rwlock);
1587         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1588             substream->runtime->status->state != substream1->runtime->status->state) {
1589                 res = -EBADFD;
1590                 goto _end;
1591         }
1592         if (snd_pcm_stream_linked(substream1)) {
1593                 res = -EALREADY;
1594                 goto _end;
1595         }
1596         if (!snd_pcm_stream_linked(substream)) {
1597                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1598                 if (substream->group == NULL) {
1599                         res = -ENOMEM;
1600                         goto _end;
1601                 }
1602                 spin_lock_init(&substream->group->lock);
1603                 INIT_LIST_HEAD(&substream->group->substreams);
1604                 list_add_tail(&substream->link_list, &substream->group->substreams);
1605                 substream->group->count = 1;
1606         }
1607         list_add_tail(&substream1->link_list, &substream->group->substreams);
1608         substream->group->count++;
1609         substream1->group = substream->group;
1610  _end:
1611         write_unlock_irq(&snd_pcm_link_rwlock);
1612         up_write(&snd_pcm_link_rwsem);
1613         fput(file);
1614         return res;
1615 }
1616
1617 static void relink_to_local(struct snd_pcm_substream *substream)
1618 {
1619         substream->group = &substream->self_group;
1620         INIT_LIST_HEAD(&substream->self_group.substreams);
1621         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1622 }
1623
1624 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1625 {
1626         struct list_head *pos;
1627         int res = 0;
1628
1629         down_write(&snd_pcm_link_rwsem);
1630         write_lock_irq(&snd_pcm_link_rwlock);
1631         if (!snd_pcm_stream_linked(substream)) {
1632                 res = -EALREADY;
1633                 goto _end;
1634         }
1635         list_del(&substream->link_list);
1636         substream->group->count--;
1637         if (substream->group->count == 1) {     /* detach the last stream, too */
1638                 snd_pcm_group_for_each(pos, substream) {
1639                         relink_to_local(snd_pcm_group_substream_entry(pos));
1640                         break;
1641                 }
1642                 kfree(substream->group);
1643         }
1644         relink_to_local(substream);
1645        _end:
1646         write_unlock_irq(&snd_pcm_link_rwlock);
1647         up_write(&snd_pcm_link_rwsem);
1648         return res;
1649 }
1650
1651 /*
1652  * hw configurator
1653  */
1654 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1655                                struct snd_pcm_hw_rule *rule)
1656 {
1657         struct snd_interval t;
1658         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1659                      hw_param_interval_c(params, rule->deps[1]), &t);
1660         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1661 }
1662
1663 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1664                                struct snd_pcm_hw_rule *rule)
1665 {
1666         struct snd_interval t;
1667         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1668                      hw_param_interval_c(params, rule->deps[1]), &t);
1669         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1670 }
1671
1672 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1673                                    struct snd_pcm_hw_rule *rule)
1674 {
1675         struct snd_interval t;
1676         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1677                          hw_param_interval_c(params, rule->deps[1]),
1678                          (unsigned long) rule->private, &t);
1679         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1680 }
1681
1682 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1683                                    struct snd_pcm_hw_rule *rule)
1684 {
1685         struct snd_interval t;
1686         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1687                          (unsigned long) rule->private,
1688                          hw_param_interval_c(params, rule->deps[1]), &t);
1689         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1690 }
1691
1692 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1693                                   struct snd_pcm_hw_rule *rule)
1694 {
1695         unsigned int k;
1696         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1697         struct snd_mask m;
1698         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1699         snd_mask_any(&m);
1700         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1701                 int bits;
1702                 if (! snd_mask_test(mask, k))
1703                         continue;
1704                 bits = snd_pcm_format_physical_width(k);
1705                 if (bits <= 0)
1706                         continue; /* ignore invalid formats */
1707                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1708                         snd_mask_reset(&m, k);
1709         }
1710         return snd_mask_refine(mask, &m);
1711 }
1712
1713 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1714                                        struct snd_pcm_hw_rule *rule)
1715 {
1716         struct snd_interval t;
1717         unsigned int k;
1718         t.min = UINT_MAX;
1719         t.max = 0;
1720         t.openmin = 0;
1721         t.openmax = 0;
1722         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1723                 int bits;
1724                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1725                         continue;
1726                 bits = snd_pcm_format_physical_width(k);
1727                 if (bits <= 0)
1728                         continue; /* ignore invalid formats */
1729                 if (t.min > (unsigned)bits)
1730                         t.min = bits;
1731                 if (t.max < (unsigned)bits)
1732                         t.max = bits;
1733         }
1734         t.integer = 1;
1735         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1736 }
1737
1738 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1739 #error "Change this table"
1740 #endif
1741
1742 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1743                                  48000, 64000, 88200, 96000, 176400, 192000 };
1744
1745 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1746                                 struct snd_pcm_hw_rule *rule)
1747 {
1748         struct snd_pcm_hardware *hw = rule->private;
1749         return snd_interval_list(hw_param_interval(params, rule->var),
1750                                  ARRAY_SIZE(rates), rates, hw->rates);
1751 }               
1752
1753 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1754                                             struct snd_pcm_hw_rule *rule)
1755 {
1756         struct snd_interval t;
1757         struct snd_pcm_substream *substream = rule->private;
1758         t.min = 0;
1759         t.max = substream->buffer_bytes_max;
1760         t.openmin = 0;
1761         t.openmax = 0;
1762         t.integer = 1;
1763         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1764 }               
1765
1766 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1767 {
1768         struct snd_pcm_runtime *runtime = substream->runtime;
1769         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1770         int k, err;
1771
1772         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1773                 snd_mask_any(constrs_mask(constrs, k));
1774         }
1775
1776         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1777                 snd_interval_any(constrs_interval(constrs, k));
1778         }
1779
1780         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1781         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1782         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1783         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1784         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1785
1786         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1787                                    snd_pcm_hw_rule_format, NULL,
1788                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1789         if (err < 0)
1790                 return err;
1791         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
1792                                   snd_pcm_hw_rule_sample_bits, NULL,
1793                                   SNDRV_PCM_HW_PARAM_FORMAT, 
1794                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1795         if (err < 0)
1796                 return err;
1797         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
1798                                   snd_pcm_hw_rule_div, NULL,
1799                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1800         if (err < 0)
1801                 return err;
1802         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1803                                   snd_pcm_hw_rule_mul, NULL,
1804                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1805         if (err < 0)
1806                 return err;
1807         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1808                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1809                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1810         if (err < 0)
1811                 return err;
1812         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1813                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1814                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1815         if (err < 0)
1816                 return err;
1817         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
1818                                   snd_pcm_hw_rule_div, NULL,
1819                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1820         if (err < 0)
1821                 return err;
1822         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1823                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1824                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1825         if (err < 0)
1826                 return err;
1827         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1828                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1829                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1830         if (err < 0)
1831                 return err;
1832         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
1833                                   snd_pcm_hw_rule_div, NULL,
1834                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1835         if (err < 0)
1836                 return err;
1837         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1838                                   snd_pcm_hw_rule_div, NULL,
1839                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1840         if (err < 0)
1841                 return err;
1842         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1843                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1844                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1845         if (err < 0)
1846                 return err;
1847         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1848                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1849                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1850         if (err < 0)
1851                 return err;
1852         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1853                                   snd_pcm_hw_rule_mul, NULL,
1854                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1855         if (err < 0)
1856                 return err;
1857         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1858                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1859                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1860         if (err < 0)
1861                 return err;
1862         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1863                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1864                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1865         if (err < 0)
1866                 return err;
1867         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
1868                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1869                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1870         if (err < 0)
1871                 return err;
1872         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
1873                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1874                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1875         if (err < 0)
1876                 return err;
1877         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
1878                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1879                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1880         if (err < 0)
1881                 return err;
1882         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
1883                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1884                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1885         if (err < 0)
1886                 return err;
1887         return 0;
1888 }
1889
1890 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1891 {
1892         struct snd_pcm_runtime *runtime = substream->runtime;
1893         struct snd_pcm_hardware *hw = &runtime->hw;
1894         int err;
1895         unsigned int mask = 0;
1896
1897         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1898                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1899         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1900                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1901         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1902                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1903                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1904                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1905                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1906                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1907                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1908         }
1909         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1910         snd_assert(err >= 0, return -EINVAL);
1911
1912         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1913         snd_assert(err >= 0, return -EINVAL);
1914
1915         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1916         snd_assert(err >= 0, return -EINVAL);
1917
1918         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1919                                            hw->channels_min, hw->channels_max);
1920         snd_assert(err >= 0, return -EINVAL);
1921
1922         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1923                                            hw->rate_min, hw->rate_max);
1924         snd_assert(err >= 0, return -EINVAL);
1925
1926         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1927                                            hw->period_bytes_min, hw->period_bytes_max);
1928         snd_assert(err >= 0, return -EINVAL);
1929
1930         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1931                                            hw->periods_min, hw->periods_max);
1932         snd_assert(err >= 0, return -EINVAL);
1933
1934         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1935                                            hw->period_bytes_min, hw->buffer_bytes_max);
1936         snd_assert(err >= 0, return -EINVAL);
1937
1938         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
1939                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1940                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1941         if (err < 0)
1942                 return err;
1943
1944         /* FIXME: remove */
1945         if (runtime->dma_bytes) {
1946                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1947                 snd_assert(err >= 0, return -EINVAL);
1948         }
1949
1950         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1951                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1952                                           snd_pcm_hw_rule_rate, hw,
1953                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1954                 if (err < 0)
1955                         return err;
1956         }
1957
1958         /* FIXME: this belong to lowlevel */
1959         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
1960                                      1000000 / HZ, 1000000 / HZ);
1961         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1962
1963         return 0;
1964 }
1965
1966 static void snd_pcm_add_file(struct snd_pcm_str *str,
1967                              struct snd_pcm_file *pcm_file)
1968 {
1969         pcm_file->next = str->files;
1970         str->files = pcm_file;
1971 }
1972
1973 static void snd_pcm_remove_file(struct snd_pcm_str *str,
1974                                 struct snd_pcm_file *pcm_file)
1975 {
1976         struct snd_pcm_file * pcm_file1;
1977         if (str->files == pcm_file) {
1978                 str->files = pcm_file->next;
1979         } else {
1980                 pcm_file1 = str->files;
1981                 while (pcm_file1 && pcm_file1->next != pcm_file)
1982                         pcm_file1 = pcm_file1->next;
1983                 if (pcm_file1 != NULL)
1984                         pcm_file1->next = pcm_file->next;
1985         }
1986 }
1987
1988 static int snd_pcm_release_file(struct snd_pcm_file * pcm_file)
1989 {
1990         struct snd_pcm_substream *substream;
1991         struct snd_pcm_runtime *runtime;
1992         struct snd_pcm_str * str;
1993
1994         snd_assert(pcm_file != NULL, return -ENXIO);
1995         substream = pcm_file->substream;
1996         snd_assert(substream != NULL, return -ENXIO);
1997         runtime = substream->runtime;
1998         str = substream->pstr;
1999         snd_pcm_unlink(substream);
2000         if (substream->ffile != NULL) {
2001                 if (substream->ops->hw_free != NULL)
2002                         substream->ops->hw_free(substream);
2003                 substream->ops->close(substream);
2004                 substream->ffile = NULL;
2005         }
2006         snd_pcm_remove_file(str, pcm_file);
2007         snd_pcm_release_substream(substream);
2008         kfree(pcm_file);
2009         return 0;
2010 }
2011
2012 static int snd_pcm_open_file(struct file *file,
2013                              struct snd_pcm *pcm,
2014                              int stream,
2015                              struct snd_pcm_file **rpcm_file)
2016 {
2017         int err = 0;
2018         struct snd_pcm_file *pcm_file;
2019         struct snd_pcm_substream *substream;
2020         struct snd_pcm_str *str;
2021
2022         snd_assert(rpcm_file != NULL, return -EINVAL);
2023         *rpcm_file = NULL;
2024
2025         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2026         if (pcm_file == NULL) {
2027                 return -ENOMEM;
2028         }
2029
2030         if ((err = snd_pcm_open_substream(pcm, stream, &substream)) < 0) {
2031                 kfree(pcm_file);
2032                 return err;
2033         }
2034
2035         str = substream->pstr;
2036         substream->file = pcm_file;
2037         substream->no_mmap_ctrl = 0;
2038
2039         pcm_file->substream = substream;
2040
2041         snd_pcm_add_file(str, pcm_file);
2042
2043         err = snd_pcm_hw_constraints_init(substream);
2044         if (err < 0) {
2045                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2046                 snd_pcm_release_file(pcm_file);
2047                 return err;
2048         }
2049
2050         if ((err = substream->ops->open(substream)) < 0) {
2051                 snd_pcm_release_file(pcm_file);
2052                 return err;
2053         }
2054         substream->ffile = file;
2055
2056         err = snd_pcm_hw_constraints_complete(substream);
2057         if (err < 0) {
2058                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2059                 snd_pcm_release_file(pcm_file);
2060                 return err;
2061         }
2062
2063         file->private_data = pcm_file;
2064         *rpcm_file = pcm_file;
2065         return 0;
2066 }
2067
2068 static int snd_pcm_open(struct inode *inode, struct file *file)
2069 {
2070         int cardnum = SNDRV_MINOR_CARD(iminor(inode));
2071         int device = SNDRV_MINOR_DEVICE(iminor(inode));
2072         int err;
2073         struct snd_pcm *pcm;
2074         struct snd_pcm_file *pcm_file;
2075         wait_queue_t wait;
2076
2077         if (device < SNDRV_MINOR_PCM_PLAYBACK || device >= SNDRV_MINOR_DEVICES)
2078                 return -ENXIO;
2079         pcm = snd_pcm_devices[(cardnum * SNDRV_PCM_DEVICES) + (device % SNDRV_MINOR_PCMS)];
2080         if (pcm == NULL) {
2081                 err = -ENODEV;
2082                 goto __error1;
2083         }
2084         err = snd_card_file_add(pcm->card, file);
2085         if (err < 0)
2086                 goto __error1;
2087         if (!try_module_get(pcm->card->module)) {
2088                 err = -EFAULT;
2089                 goto __error2;
2090         }
2091         init_waitqueue_entry(&wait, current);
2092         add_wait_queue(&pcm->open_wait, &wait);
2093         down(&pcm->open_mutex);
2094         while (1) {
2095                 err = snd_pcm_open_file(file, pcm, device >= SNDRV_MINOR_PCM_CAPTURE ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, &pcm_file);
2096                 if (err >= 0)
2097                         break;
2098                 if (err == -EAGAIN) {
2099                         if (file->f_flags & O_NONBLOCK) {
2100                                 err = -EBUSY;
2101                                 break;
2102                         }
2103                 } else
2104                         break;
2105                 set_current_state(TASK_INTERRUPTIBLE);
2106                 up(&pcm->open_mutex);
2107                 schedule();
2108                 down(&pcm->open_mutex);
2109                 if (signal_pending(current)) {
2110                         err = -ERESTARTSYS;
2111                         break;
2112                 }
2113         }
2114         remove_wait_queue(&pcm->open_wait, &wait);
2115         up(&pcm->open_mutex);
2116         if (err < 0)
2117                 goto __error;
2118         return err;
2119
2120       __error:
2121         module_put(pcm->card->module);
2122       __error2:
2123         snd_card_file_remove(pcm->card, file);
2124       __error1:
2125         return err;
2126 }
2127
2128 static int snd_pcm_release(struct inode *inode, struct file *file)
2129 {
2130         struct snd_pcm *pcm;
2131         struct snd_pcm_substream *substream;
2132         struct snd_pcm_file *pcm_file;
2133
2134         pcm_file = file->private_data;
2135         substream = pcm_file->substream;
2136         snd_assert(substream != NULL, return -ENXIO);
2137         snd_assert(!atomic_read(&substream->runtime->mmap_count), );
2138         pcm = substream->pcm;
2139         snd_pcm_drop(substream);
2140         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2141         down(&pcm->open_mutex);
2142         snd_pcm_release_file(pcm_file);
2143         up(&pcm->open_mutex);
2144         wake_up(&pcm->open_wait);
2145         module_put(pcm->card->module);
2146         snd_card_file_remove(pcm->card, file);
2147         return 0;
2148 }
2149
2150 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2151                                                  snd_pcm_uframes_t frames)
2152 {
2153         struct snd_pcm_runtime *runtime = substream->runtime;
2154         snd_pcm_sframes_t appl_ptr;
2155         snd_pcm_sframes_t ret;
2156         snd_pcm_sframes_t hw_avail;
2157
2158         if (frames == 0)
2159                 return 0;
2160
2161         snd_pcm_stream_lock_irq(substream);
2162         switch (runtime->status->state) {
2163         case SNDRV_PCM_STATE_PREPARED:
2164                 break;
2165         case SNDRV_PCM_STATE_DRAINING:
2166         case SNDRV_PCM_STATE_RUNNING:
2167                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2168                         break;
2169                 /* Fall through */
2170         case SNDRV_PCM_STATE_XRUN:
2171                 ret = -EPIPE;
2172                 goto __end;
2173         default:
2174                 ret = -EBADFD;
2175                 goto __end;
2176         }
2177
2178         hw_avail = snd_pcm_playback_hw_avail(runtime);
2179         if (hw_avail <= 0) {
2180                 ret = 0;
2181                 goto __end;
2182         }
2183         if (frames > (snd_pcm_uframes_t)hw_avail)
2184                 frames = hw_avail;
2185         else
2186                 frames -= frames % runtime->xfer_align;
2187         appl_ptr = runtime->control->appl_ptr - frames;
2188         if (appl_ptr < 0)
2189                 appl_ptr += runtime->boundary;
2190         runtime->control->appl_ptr = appl_ptr;
2191         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2192             runtime->sleep_min)
2193                 snd_pcm_tick_prepare(substream);
2194         ret = frames;
2195  __end:
2196         snd_pcm_stream_unlock_irq(substream);
2197         return ret;
2198 }
2199
2200 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2201                                                 snd_pcm_uframes_t frames)
2202 {
2203         struct snd_pcm_runtime *runtime = substream->runtime;
2204         snd_pcm_sframes_t appl_ptr;
2205         snd_pcm_sframes_t ret;
2206         snd_pcm_sframes_t hw_avail;
2207
2208         if (frames == 0)
2209                 return 0;
2210
2211         snd_pcm_stream_lock_irq(substream);
2212         switch (runtime->status->state) {
2213         case SNDRV_PCM_STATE_PREPARED:
2214         case SNDRV_PCM_STATE_DRAINING:
2215                 break;
2216         case SNDRV_PCM_STATE_RUNNING:
2217                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2218                         break;
2219                 /* Fall through */
2220         case SNDRV_PCM_STATE_XRUN:
2221                 ret = -EPIPE;
2222                 goto __end;
2223         default:
2224                 ret = -EBADFD;
2225                 goto __end;
2226         }
2227
2228         hw_avail = snd_pcm_capture_hw_avail(runtime);
2229         if (hw_avail <= 0) {
2230                 ret = 0;
2231                 goto __end;
2232         }
2233         if (frames > (snd_pcm_uframes_t)hw_avail)
2234                 frames = hw_avail;
2235         else
2236                 frames -= frames % runtime->xfer_align;
2237         appl_ptr = runtime->control->appl_ptr - frames;
2238         if (appl_ptr < 0)
2239                 appl_ptr += runtime->boundary;
2240         runtime->control->appl_ptr = appl_ptr;
2241         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2242             runtime->sleep_min)
2243                 snd_pcm_tick_prepare(substream);
2244         ret = frames;
2245  __end:
2246         snd_pcm_stream_unlock_irq(substream);
2247         return ret;
2248 }
2249
2250 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2251                                                   snd_pcm_uframes_t frames)
2252 {
2253         struct snd_pcm_runtime *runtime = substream->runtime;
2254         snd_pcm_sframes_t appl_ptr;
2255         snd_pcm_sframes_t ret;
2256         snd_pcm_sframes_t avail;
2257
2258         if (frames == 0)
2259                 return 0;
2260
2261         snd_pcm_stream_lock_irq(substream);
2262         switch (runtime->status->state) {
2263         case SNDRV_PCM_STATE_PREPARED:
2264         case SNDRV_PCM_STATE_PAUSED:
2265                 break;
2266         case SNDRV_PCM_STATE_DRAINING:
2267         case SNDRV_PCM_STATE_RUNNING:
2268                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2269                         break;
2270                 /* Fall through */
2271         case SNDRV_PCM_STATE_XRUN:
2272                 ret = -EPIPE;
2273                 goto __end;
2274         default:
2275                 ret = -EBADFD;
2276                 goto __end;
2277         }
2278
2279         avail = snd_pcm_playback_avail(runtime);
2280         if (avail <= 0) {
2281                 ret = 0;
2282                 goto __end;
2283         }
2284         if (frames > (snd_pcm_uframes_t)avail)
2285                 frames = avail;
2286         else
2287                 frames -= frames % runtime->xfer_align;
2288         appl_ptr = runtime->control->appl_ptr + frames;
2289         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2290                 appl_ptr -= runtime->boundary;
2291         runtime->control->appl_ptr = appl_ptr;
2292         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2293             runtime->sleep_min)
2294                 snd_pcm_tick_prepare(substream);
2295         ret = frames;
2296  __end:
2297         snd_pcm_stream_unlock_irq(substream);
2298         return ret;
2299 }
2300
2301 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2302                                                  snd_pcm_uframes_t frames)
2303 {
2304         struct snd_pcm_runtime *runtime = substream->runtime;
2305         snd_pcm_sframes_t appl_ptr;
2306         snd_pcm_sframes_t ret;
2307         snd_pcm_sframes_t avail;
2308
2309         if (frames == 0)
2310                 return 0;
2311
2312         snd_pcm_stream_lock_irq(substream);
2313         switch (runtime->status->state) {
2314         case SNDRV_PCM_STATE_PREPARED:
2315         case SNDRV_PCM_STATE_DRAINING:
2316         case SNDRV_PCM_STATE_PAUSED:
2317                 break;
2318         case SNDRV_PCM_STATE_RUNNING:
2319                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2320                         break;
2321                 /* Fall through */
2322         case SNDRV_PCM_STATE_XRUN:
2323                 ret = -EPIPE;
2324                 goto __end;
2325         default:
2326                 ret = -EBADFD;
2327                 goto __end;
2328         }
2329
2330         avail = snd_pcm_capture_avail(runtime);
2331         if (avail <= 0) {
2332                 ret = 0;
2333                 goto __end;
2334         }
2335         if (frames > (snd_pcm_uframes_t)avail)
2336                 frames = avail;
2337         else
2338                 frames -= frames % runtime->xfer_align;
2339         appl_ptr = runtime->control->appl_ptr + frames;
2340         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2341                 appl_ptr -= runtime->boundary;
2342         runtime->control->appl_ptr = appl_ptr;
2343         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2344             runtime->sleep_min)
2345                 snd_pcm_tick_prepare(substream);
2346         ret = frames;
2347  __end:
2348         snd_pcm_stream_unlock_irq(substream);
2349         return ret;
2350 }
2351
2352 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2353 {
2354         struct snd_pcm_runtime *runtime = substream->runtime;
2355         int err;
2356
2357         snd_pcm_stream_lock_irq(substream);
2358         switch (runtime->status->state) {
2359         case SNDRV_PCM_STATE_DRAINING:
2360                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2361                         goto __badfd;
2362         case SNDRV_PCM_STATE_RUNNING:
2363                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2364                         break;
2365                 /* Fall through */
2366         case SNDRV_PCM_STATE_PREPARED:
2367         case SNDRV_PCM_STATE_SUSPENDED:
2368                 err = 0;
2369                 break;
2370         case SNDRV_PCM_STATE_XRUN:
2371                 err = -EPIPE;
2372                 break;
2373         default:
2374               __badfd:
2375                 err = -EBADFD;
2376                 break;
2377         }
2378         snd_pcm_stream_unlock_irq(substream);
2379         return err;
2380 }
2381                 
2382 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2383                          snd_pcm_sframes_t __user *res)
2384 {
2385         struct snd_pcm_runtime *runtime = substream->runtime;
2386         int err;
2387         snd_pcm_sframes_t n = 0;
2388
2389         snd_pcm_stream_lock_irq(substream);
2390         switch (runtime->status->state) {
2391         case SNDRV_PCM_STATE_DRAINING:
2392                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2393                         goto __badfd;
2394         case SNDRV_PCM_STATE_RUNNING:
2395                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2396                         break;
2397                 /* Fall through */
2398         case SNDRV_PCM_STATE_PREPARED:
2399         case SNDRV_PCM_STATE_SUSPENDED:
2400                 err = 0;
2401                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2402                         n = snd_pcm_playback_hw_avail(runtime);
2403                 else
2404                         n = snd_pcm_capture_avail(runtime);
2405                 break;
2406         case SNDRV_PCM_STATE_XRUN:
2407                 err = -EPIPE;
2408                 break;
2409         default:
2410               __badfd:
2411                 err = -EBADFD;
2412                 break;
2413         }
2414         snd_pcm_stream_unlock_irq(substream);
2415         if (!err)
2416                 if (put_user(n, res))
2417                         err = -EFAULT;
2418         return err;
2419 }
2420                 
2421 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2422                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2423 {
2424         struct snd_pcm_runtime *runtime = substream->runtime;
2425         struct snd_pcm_sync_ptr sync_ptr;
2426         volatile struct snd_pcm_mmap_status *status;
2427         volatile struct snd_pcm_mmap_control *control;
2428         int err;
2429
2430         memset(&sync_ptr, 0, sizeof(sync_ptr));
2431         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2432                 return -EFAULT;
2433         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2434                 return -EFAULT; 
2435         status = runtime->status;
2436         control = runtime->control;
2437         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2438                 err = snd_pcm_hwsync(substream);
2439                 if (err < 0)
2440                         return err;
2441         }
2442         snd_pcm_stream_lock_irq(substream);
2443         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2444                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2445         else
2446                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2447         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2448                 control->avail_min = sync_ptr.c.control.avail_min;
2449         else
2450                 sync_ptr.c.control.avail_min = control->avail_min;
2451         sync_ptr.s.status.state = status->state;
2452         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2453         sync_ptr.s.status.tstamp = status->tstamp;
2454         sync_ptr.s.status.suspended_state = status->suspended_state;
2455         snd_pcm_stream_unlock_irq(substream);
2456         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2457                 return -EFAULT;
2458         return 0;
2459 }
2460                 
2461 static int snd_pcm_playback_ioctl1(struct snd_pcm_substream *substream,
2462                                    unsigned int cmd, void __user *arg);
2463 static int snd_pcm_capture_ioctl1(struct snd_pcm_substream *substream,
2464                                   unsigned int cmd, void __user *arg);
2465
2466 static int snd_pcm_common_ioctl1(struct snd_pcm_substream *substream,
2467                                  unsigned int cmd, void __user *arg)
2468 {
2469         snd_assert(substream != NULL, return -ENXIO);
2470
2471         switch (cmd) {
2472         case SNDRV_PCM_IOCTL_PVERSION:
2473                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2474         case SNDRV_PCM_IOCTL_INFO:
2475                 return snd_pcm_info_user(substream, arg);
2476         case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2477                 return 0;
2478         case SNDRV_PCM_IOCTL_HW_REFINE:
2479                 return snd_pcm_hw_refine_user(substream, arg);
2480         case SNDRV_PCM_IOCTL_HW_PARAMS:
2481                 return snd_pcm_hw_params_user(substream, arg);
2482         case SNDRV_PCM_IOCTL_HW_FREE:
2483                 return snd_pcm_hw_free(substream);
2484         case SNDRV_PCM_IOCTL_SW_PARAMS:
2485                 return snd_pcm_sw_params_user(substream, arg);
2486         case SNDRV_PCM_IOCTL_STATUS:
2487                 return snd_pcm_status_user(substream, arg);
2488         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2489                 return snd_pcm_channel_info_user(substream, arg);
2490         case SNDRV_PCM_IOCTL_PREPARE:
2491                 return snd_pcm_prepare(substream);
2492         case SNDRV_PCM_IOCTL_RESET:
2493                 return snd_pcm_reset(substream);
2494         case SNDRV_PCM_IOCTL_START:
2495                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2496         case SNDRV_PCM_IOCTL_LINK:
2497                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2498         case SNDRV_PCM_IOCTL_UNLINK:
2499                 return snd_pcm_unlink(substream);
2500         case SNDRV_PCM_IOCTL_RESUME:
2501                 return snd_pcm_resume(substream);
2502         case SNDRV_PCM_IOCTL_XRUN:
2503                 return snd_pcm_xrun(substream);
2504         case SNDRV_PCM_IOCTL_HWSYNC:
2505                 return snd_pcm_hwsync(substream);
2506         case SNDRV_PCM_IOCTL_DELAY:
2507                 return snd_pcm_delay(substream, arg);
2508         case SNDRV_PCM_IOCTL_SYNC_PTR:
2509                 return snd_pcm_sync_ptr(substream, arg);
2510         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2511                 return snd_pcm_hw_refine_old_user(substream, arg);
2512         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2513                 return snd_pcm_hw_params_old_user(substream, arg);
2514         case SNDRV_PCM_IOCTL_DRAIN:
2515                 return snd_pcm_drain(substream);
2516         case SNDRV_PCM_IOCTL_DROP:
2517                 return snd_pcm_drop(substream);
2518         }
2519         snd_printd("unknown ioctl = 0x%x\n", cmd);
2520         return -ENOTTY;
2521 }
2522
2523 static int snd_pcm_playback_ioctl1(struct snd_pcm_substream *substream,
2524                                    unsigned int cmd, void __user *arg)
2525 {
2526         snd_assert(substream != NULL, return -ENXIO);
2527         snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2528         switch (cmd) {
2529         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2530         {
2531                 struct snd_xferi xferi;
2532                 struct snd_xferi __user *_xferi = arg;
2533                 struct snd_pcm_runtime *runtime = substream->runtime;
2534                 snd_pcm_sframes_t result;
2535                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2536                         return -EBADFD;
2537                 if (put_user(0, &_xferi->result))
2538                         return -EFAULT;
2539                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2540                         return -EFAULT;
2541                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2542                 __put_user(result, &_xferi->result);
2543                 return result < 0 ? result : 0;
2544         }
2545         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2546         {
2547                 struct snd_xfern xfern;
2548                 struct snd_xfern __user *_xfern = arg;
2549                 struct snd_pcm_runtime *runtime = substream->runtime;
2550                 void __user **bufs;
2551                 snd_pcm_sframes_t result;
2552                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2553                         return -EBADFD;
2554                 if (runtime->channels > 128)
2555                         return -EINVAL;
2556                 if (put_user(0, &_xfern->result))
2557                         return -EFAULT;
2558                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2559                         return -EFAULT;
2560                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2561                 if (bufs == NULL)
2562                         return -ENOMEM;
2563                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2564                         kfree(bufs);
2565                         return -EFAULT;
2566                 }
2567                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2568                 kfree(bufs);
2569                 __put_user(result, &_xfern->result);
2570                 return result < 0 ? result : 0;
2571         }
2572         case SNDRV_PCM_IOCTL_REWIND:
2573         {
2574                 snd_pcm_uframes_t frames;
2575                 snd_pcm_uframes_t __user *_frames = arg;
2576                 snd_pcm_sframes_t result;
2577                 if (get_user(frames, _frames))
2578                         return -EFAULT;
2579                 if (put_user(0, _frames))
2580                         return -EFAULT;
2581                 result = snd_pcm_playback_rewind(substream, frames);
2582                 __put_user(result, _frames);
2583                 return result < 0 ? result : 0;
2584         }
2585         case SNDRV_PCM_IOCTL_FORWARD:
2586         {
2587                 snd_pcm_uframes_t frames;
2588                 snd_pcm_uframes_t __user *_frames = arg;
2589                 snd_pcm_sframes_t result;
2590                 if (get_user(frames, _frames))
2591                         return -EFAULT;
2592                 if (put_user(0, _frames))
2593                         return -EFAULT;
2594                 result = snd_pcm_playback_forward(substream, frames);
2595                 __put_user(result, _frames);
2596                 return result < 0 ? result : 0;
2597         }
2598         case SNDRV_PCM_IOCTL_PAUSE:
2599         {
2600                 int res;
2601                 snd_pcm_stream_lock_irq(substream);
2602                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2603                 snd_pcm_stream_unlock_irq(substream);
2604                 return res;
2605         }
2606         }
2607         return snd_pcm_common_ioctl1(substream, cmd, arg);
2608 }
2609
2610 static int snd_pcm_capture_ioctl1(struct snd_pcm_substream *substream,
2611                                   unsigned int cmd, void __user *arg)
2612 {
2613         snd_assert(substream != NULL, return -ENXIO);
2614         snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2615         switch (cmd) {
2616         case SNDRV_PCM_IOCTL_READI_FRAMES:
2617         {
2618                 struct snd_xferi xferi;
2619                 struct snd_xferi __user *_xferi = arg;
2620                 struct snd_pcm_runtime *runtime = substream->runtime;
2621                 snd_pcm_sframes_t result;
2622                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2623                         return -EBADFD;
2624                 if (put_user(0, &_xferi->result))
2625                         return -EFAULT;
2626                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2627                         return -EFAULT;
2628                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2629                 __put_user(result, &_xferi->result);
2630                 return result < 0 ? result : 0;
2631         }
2632         case SNDRV_PCM_IOCTL_READN_FRAMES:
2633         {
2634                 struct snd_xfern xfern;
2635                 struct snd_xfern __user *_xfern = arg;
2636                 struct snd_pcm_runtime *runtime = substream->runtime;
2637                 void *bufs;
2638                 snd_pcm_sframes_t result;
2639                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2640                         return -EBADFD;
2641                 if (runtime->channels > 128)
2642                         return -EINVAL;
2643                 if (put_user(0, &_xfern->result))
2644                         return -EFAULT;
2645                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2646                         return -EFAULT;
2647                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2648                 if (bufs == NULL)
2649                         return -ENOMEM;
2650                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2651                         kfree(bufs);
2652                         return -EFAULT;
2653                 }
2654                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2655                 kfree(bufs);
2656                 __put_user(result, &_xfern->result);
2657                 return result < 0 ? result : 0;
2658         }
2659         case SNDRV_PCM_IOCTL_REWIND:
2660         {
2661                 snd_pcm_uframes_t frames;
2662                 snd_pcm_uframes_t __user *_frames = arg;
2663                 snd_pcm_sframes_t result;
2664                 if (get_user(frames, _frames))
2665                         return -EFAULT;
2666                 if (put_user(0, _frames))
2667                         return -EFAULT;
2668                 result = snd_pcm_capture_rewind(substream, frames);
2669                 __put_user(result, _frames);
2670                 return result < 0 ? result : 0;
2671         }
2672         case SNDRV_PCM_IOCTL_FORWARD:
2673         {
2674                 snd_pcm_uframes_t frames;
2675                 snd_pcm_uframes_t __user *_frames = arg;
2676                 snd_pcm_sframes_t result;
2677                 if (get_user(frames, _frames))
2678                         return -EFAULT;
2679                 if (put_user(0, _frames))
2680                         return -EFAULT;
2681                 result = snd_pcm_capture_forward(substream, frames);
2682                 __put_user(result, _frames);
2683                 return result < 0 ? result : 0;
2684         }
2685         }
2686         return snd_pcm_common_ioctl1(substream, cmd, arg);
2687 }
2688
2689 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2690                                    unsigned long arg)
2691 {
2692         struct snd_pcm_file *pcm_file;
2693
2694         pcm_file = file->private_data;
2695
2696         if (((cmd >> 8) & 0xff) != 'A')
2697                 return -ENOTTY;
2698
2699         return snd_pcm_playback_ioctl1(pcm_file->substream, cmd, (void __user *)arg);
2700 }
2701
2702 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2703                                   unsigned long arg)
2704 {
2705         struct snd_pcm_file *pcm_file;
2706
2707         pcm_file = file->private_data;
2708
2709         if (((cmd >> 8) & 0xff) != 'A')
2710                 return -ENOTTY;
2711
2712         return snd_pcm_capture_ioctl1(pcm_file->substream, cmd, (void __user *)arg);
2713 }
2714
2715 int snd_pcm_kernel_playback_ioctl(struct snd_pcm_substream *substream,
2716                                   unsigned int cmd, void *arg)
2717 {
2718         mm_segment_t fs;
2719         int result;
2720         
2721         fs = snd_enter_user();
2722         result = snd_pcm_playback_ioctl1(substream, cmd, (void __user *)arg);
2723         snd_leave_user(fs);
2724         return result;
2725 }
2726
2727 int snd_pcm_kernel_capture_ioctl(struct snd_pcm_substream *substream,
2728                                  unsigned int cmd, void *arg)
2729 {
2730         mm_segment_t fs;
2731         int result;
2732         
2733         fs = snd_enter_user();
2734         result = snd_pcm_capture_ioctl1(substream, cmd, (void __user *)arg);
2735         snd_leave_user(fs);
2736         return result;
2737 }
2738
2739 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2740                          unsigned int cmd, void *arg)
2741 {
2742         switch (substream->stream) {
2743         case SNDRV_PCM_STREAM_PLAYBACK:
2744                 return snd_pcm_kernel_playback_ioctl(substream, cmd, arg);
2745         case SNDRV_PCM_STREAM_CAPTURE:
2746                 return snd_pcm_kernel_capture_ioctl(substream, cmd, arg);
2747         default:
2748                 return -EINVAL;
2749         }
2750 }
2751
2752 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2753                             loff_t * offset)
2754 {
2755         struct snd_pcm_file *pcm_file;
2756         struct snd_pcm_substream *substream;
2757         struct snd_pcm_runtime *runtime;
2758         snd_pcm_sframes_t result;
2759
2760         pcm_file = file->private_data;
2761         substream = pcm_file->substream;
2762         snd_assert(substream != NULL, return -ENXIO);
2763         runtime = substream->runtime;
2764         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2765                 return -EBADFD;
2766         if (!frame_aligned(runtime, count))
2767                 return -EINVAL;
2768         count = bytes_to_frames(runtime, count);
2769         result = snd_pcm_lib_read(substream, buf, count);
2770         if (result > 0)
2771                 result = frames_to_bytes(runtime, result);
2772         return result;
2773 }
2774
2775 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2776                              size_t count, loff_t * offset)
2777 {
2778         struct snd_pcm_file *pcm_file;
2779         struct snd_pcm_substream *substream;
2780         struct snd_pcm_runtime *runtime;
2781         snd_pcm_sframes_t result;
2782
2783         pcm_file = file->private_data;
2784         substream = pcm_file->substream;
2785         snd_assert(substream != NULL, result = -ENXIO; goto end);
2786         runtime = substream->runtime;
2787         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2788                 result = -EBADFD;
2789                 goto end;
2790         }
2791         if (!frame_aligned(runtime, count)) {
2792                 result = -EINVAL;
2793                 goto end;
2794         }
2795         count = bytes_to_frames(runtime, count);
2796         result = snd_pcm_lib_write(substream, buf, count);
2797         if (result > 0)
2798                 result = frames_to_bytes(runtime, result);
2799  end:
2800         return result;
2801 }
2802
2803 static ssize_t snd_pcm_readv(struct file *file, const struct iovec *_vector,
2804                              unsigned long count, loff_t * offset)
2805
2806 {
2807         struct snd_pcm_file *pcm_file;
2808         struct snd_pcm_substream *substream;
2809         struct snd_pcm_runtime *runtime;
2810         snd_pcm_sframes_t result;
2811         unsigned long i;
2812         void __user **bufs;
2813         snd_pcm_uframes_t frames;
2814
2815         pcm_file = file->private_data;
2816         substream = pcm_file->substream;
2817         snd_assert(substream != NULL, return -ENXIO);
2818         runtime = substream->runtime;
2819         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2820                 return -EBADFD;
2821         if (count > 1024 || count != runtime->channels)
2822                 return -EINVAL;
2823         if (!frame_aligned(runtime, _vector->iov_len))
2824                 return -EINVAL;
2825         frames = bytes_to_samples(runtime, _vector->iov_len);
2826         bufs = kmalloc(sizeof(void *) * count, GFP_KERNEL);
2827         if (bufs == NULL)
2828                 return -ENOMEM;
2829         for (i = 0; i < count; ++i)
2830                 bufs[i] = _vector[i].iov_base;
2831         result = snd_pcm_lib_readv(substream, bufs, frames);
2832         if (result > 0)
2833                 result = frames_to_bytes(runtime, result);
2834         kfree(bufs);
2835         return result;
2836 }
2837
2838 static ssize_t snd_pcm_writev(struct file *file, const struct iovec *_vector,
2839                               unsigned long count, loff_t * offset)
2840 {
2841         struct snd_pcm_file *pcm_file;
2842         struct snd_pcm_substream *substream;
2843         struct snd_pcm_runtime *runtime;
2844         snd_pcm_sframes_t result;
2845         unsigned long i;
2846         void __user **bufs;
2847         snd_pcm_uframes_t frames;
2848
2849         pcm_file = file->private_data;
2850         substream = pcm_file->substream;
2851         snd_assert(substream != NULL, result = -ENXIO; goto end);
2852         runtime = substream->runtime;
2853         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2854                 result = -EBADFD;
2855                 goto end;
2856         }
2857         if (count > 128 || count != runtime->channels ||
2858             !frame_aligned(runtime, _vector->iov_len)) {
2859                 result = -EINVAL;
2860                 goto end;
2861         }
2862         frames = bytes_to_samples(runtime, _vector->iov_len);
2863         bufs = kmalloc(sizeof(void *) * count, GFP_KERNEL);
2864         if (bufs == NULL)
2865                 return -ENOMEM;
2866         for (i = 0; i < count; ++i)
2867                 bufs[i] = _vector[i].iov_base;
2868         result = snd_pcm_lib_writev(substream, bufs, frames);
2869         if (result > 0)
2870                 result = frames_to_bytes(runtime, result);
2871         kfree(bufs);
2872  end:
2873         return result;
2874 }
2875
2876 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2877 {
2878         struct snd_pcm_file *pcm_file;
2879         struct snd_pcm_substream *substream;
2880         struct snd_pcm_runtime *runtime;
2881         unsigned int mask;
2882         snd_pcm_uframes_t avail;
2883
2884         pcm_file = file->private_data;
2885
2886         substream = pcm_file->substream;
2887         snd_assert(substream != NULL, return -ENXIO);
2888         runtime = substream->runtime;
2889
2890         poll_wait(file, &runtime->sleep, wait);
2891
2892         snd_pcm_stream_lock_irq(substream);
2893         avail = snd_pcm_playback_avail(runtime);
2894         switch (runtime->status->state) {
2895         case SNDRV_PCM_STATE_RUNNING:
2896         case SNDRV_PCM_STATE_PREPARED:
2897         case SNDRV_PCM_STATE_PAUSED:
2898                 if (avail >= runtime->control->avail_min) {
2899                         mask = POLLOUT | POLLWRNORM;
2900                         break;
2901                 }
2902                 /* Fall through */
2903         case SNDRV_PCM_STATE_DRAINING:
2904                 mask = 0;
2905                 break;
2906         default:
2907                 mask = POLLOUT | POLLWRNORM | POLLERR;
2908                 break;
2909         }
2910         snd_pcm_stream_unlock_irq(substream);
2911         return mask;
2912 }
2913
2914 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2915 {
2916         struct snd_pcm_file *pcm_file;
2917         struct snd_pcm_substream *substream;
2918         struct snd_pcm_runtime *runtime;
2919         unsigned int mask;
2920         snd_pcm_uframes_t avail;
2921
2922         pcm_file = file->private_data;
2923
2924         substream = pcm_file->substream;
2925         snd_assert(substream != NULL, return -ENXIO);
2926         runtime = substream->runtime;
2927
2928         poll_wait(file, &runtime->sleep, wait);
2929
2930         snd_pcm_stream_lock_irq(substream);
2931         avail = snd_pcm_capture_avail(runtime);
2932         switch (runtime->status->state) {
2933         case SNDRV_PCM_STATE_RUNNING:
2934         case SNDRV_PCM_STATE_PREPARED:
2935         case SNDRV_PCM_STATE_PAUSED:
2936                 if (avail >= runtime->control->avail_min) {
2937                         mask = POLLIN | POLLRDNORM;
2938                         break;
2939                 }
2940                 mask = 0;
2941                 break;
2942         case SNDRV_PCM_STATE_DRAINING:
2943                 if (avail > 0) {
2944                         mask = POLLIN | POLLRDNORM;
2945                         break;
2946                 }
2947                 /* Fall through */
2948         default:
2949                 mask = POLLIN | POLLRDNORM | POLLERR;
2950                 break;
2951         }
2952         snd_pcm_stream_unlock_irq(substream);
2953         return mask;
2954 }
2955
2956 /*
2957  * mmap support
2958  */
2959
2960 /*
2961  * Only on coherent architectures, we can mmap the status and the control records
2962  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2963  */
2964 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2965 /*
2966  * mmap status record
2967  */
2968 static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area,
2969                                                 unsigned long address, int *type)
2970 {
2971         struct snd_pcm_substream *substream = area->vm_private_data;
2972         struct snd_pcm_runtime *runtime;
2973         struct page * page;
2974         
2975         if (substream == NULL)
2976                 return NOPAGE_OOM;
2977         runtime = substream->runtime;
2978         page = virt_to_page(runtime->status);
2979         get_page(page);
2980         if (type)
2981                 *type = VM_FAULT_MINOR;
2982         return page;
2983 }
2984
2985 static struct vm_operations_struct snd_pcm_vm_ops_status =
2986 {
2987         .nopage =       snd_pcm_mmap_status_nopage,
2988 };
2989
2990 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
2991                                struct vm_area_struct *area)
2992 {
2993         struct snd_pcm_runtime *runtime;
2994         long size;
2995         if (!(area->vm_flags & VM_READ))
2996                 return -EINVAL;
2997         runtime = substream->runtime;
2998         snd_assert(runtime != NULL, return -EAGAIN);
2999         size = area->vm_end - area->vm_start;
3000         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3001                 return -EINVAL;
3002         area->vm_ops = &snd_pcm_vm_ops_status;
3003         area->vm_private_data = substream;
3004         area->vm_flags |= VM_RESERVED;
3005         return 0;
3006 }
3007
3008 /*
3009  * mmap control record
3010  */
3011 static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area,
3012                                                  unsigned long address, int *type)
3013 {
3014         struct snd_pcm_substream *substream = area->vm_private_data;
3015         struct snd_pcm_runtime *runtime;
3016         struct page * page;
3017         
3018         if (substream == NULL)
3019                 return NOPAGE_OOM;
3020         runtime = substream->runtime;
3021         page = virt_to_page(runtime->control);
3022         get_page(page);
3023         if (type)
3024                 *type = VM_FAULT_MINOR;
3025         return page;
3026 }
3027
3028 static struct vm_operations_struct snd_pcm_vm_ops_control =
3029 {
3030         .nopage =       snd_pcm_mmap_control_nopage,
3031 };
3032
3033 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3034                                 struct vm_area_struct *area)
3035 {
3036         struct snd_pcm_runtime *runtime;
3037         long size;
3038         if (!(area->vm_flags & VM_READ))
3039                 return -EINVAL;
3040         runtime = substream->runtime;
3041         snd_assert(runtime != NULL, return -EAGAIN);
3042         size = area->vm_end - area->vm_start;
3043         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3044                 return -EINVAL;
3045         area->vm_ops = &snd_pcm_vm_ops_control;
3046         area->vm_private_data = substream;
3047         area->vm_flags |= VM_RESERVED;
3048         return 0;
3049 }
3050 #else /* ! coherent mmap */
3051 /*
3052  * don't support mmap for status and control records.
3053  */
3054 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3055                                struct vm_area_struct *area)
3056 {
3057         return -ENXIO;
3058 }
3059 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3060                                 struct vm_area_struct *area)
3061 {
3062         return -ENXIO;
3063 }
3064 #endif /* coherent mmap */
3065
3066 /*
3067  * nopage callback for mmapping a RAM page
3068  */
3069 static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area,
3070                                              unsigned long address, int *type)
3071 {
3072         struct snd_pcm_substream *substream = area->vm_private_data;
3073         struct snd_pcm_runtime *runtime;
3074         unsigned long offset;
3075         struct page * page;
3076         void *vaddr;
3077         size_t dma_bytes;
3078         
3079         if (substream == NULL)
3080                 return NOPAGE_OOM;
3081         runtime = substream->runtime;
3082         offset = area->vm_pgoff << PAGE_SHIFT;
3083         offset += address - area->vm_start;
3084         snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_OOM);
3085         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3086         if (offset > dma_bytes - PAGE_SIZE)
3087                 return NOPAGE_SIGBUS;
3088         if (substream->ops->page) {
3089                 page = substream->ops->page(substream, offset);
3090                 if (! page)
3091                         return NOPAGE_OOM;
3092         } else {
3093                 vaddr = runtime->dma_area + offset;
3094                 page = virt_to_page(vaddr);
3095         }
3096         get_page(page);
3097         if (type)
3098                 *type = VM_FAULT_MINOR;
3099         return page;
3100 }
3101
3102 static struct vm_operations_struct snd_pcm_vm_ops_data =
3103 {
3104         .open =         snd_pcm_mmap_data_open,
3105         .close =        snd_pcm_mmap_data_close,
3106         .nopage =       snd_pcm_mmap_data_nopage,
3107 };
3108
3109 /*
3110  * mmap the DMA buffer on RAM
3111  */
3112 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3113                                 struct vm_area_struct *area)
3114 {
3115         area->vm_ops = &snd_pcm_vm_ops_data;
3116         area->vm_private_data = substream;
3117         area->vm_flags |= VM_RESERVED;
3118         atomic_inc(&substream->runtime->mmap_count);
3119         return 0;
3120 }
3121
3122 /*
3123  * mmap the DMA buffer on I/O memory area
3124  */
3125 #if SNDRV_PCM_INFO_MMAP_IOMEM
3126 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3127 {
3128         .open =         snd_pcm_mmap_data_open,
3129         .close =        snd_pcm_mmap_data_close,
3130 };
3131
3132 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3133                            struct vm_area_struct *area)
3134 {
3135         long size;
3136         unsigned long offset;
3137
3138 #ifdef pgprot_noncached
3139         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3140 #endif
3141         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3142         area->vm_private_data = substream;
3143         area->vm_flags |= VM_IO;
3144         size = area->vm_end - area->vm_start;
3145         offset = area->vm_pgoff << PAGE_SHIFT;
3146         if (io_remap_pfn_range(area, area->vm_start,
3147                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3148                                 size, area->vm_page_prot))
3149                 return -EAGAIN;
3150         atomic_inc(&substream->runtime->mmap_count);
3151         return 0;
3152 }
3153 #endif /* SNDRV_PCM_INFO_MMAP */
3154
3155 /*
3156  * mmap DMA buffer
3157  */
3158 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3159                       struct vm_area_struct *area)
3160 {
3161         struct snd_pcm_runtime *runtime;
3162         long size;
3163         unsigned long offset;
3164         size_t dma_bytes;
3165
3166         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3167                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3168                         return -EINVAL;
3169         } else {
3170                 if (!(area->vm_flags & VM_READ))
3171                         return -EINVAL;
3172         }
3173         runtime = substream->runtime;
3174         snd_assert(runtime != NULL, return -EAGAIN);
3175         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3176                 return -EBADFD;
3177         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3178                 return -ENXIO;
3179         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3180             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3181                 return -EINVAL;
3182         size = area->vm_end - area->vm_start;
3183         offset = area->vm_pgoff << PAGE_SHIFT;
3184         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3185         if ((size_t)size > dma_bytes)
3186                 return -EINVAL;
3187         if (offset > dma_bytes - size)
3188                 return -EINVAL;
3189
3190         if (substream->ops->mmap)
3191                 return substream->ops->mmap(substream, area);
3192         else
3193                 return snd_pcm_default_mmap(substream, area);
3194 }
3195
3196 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3197 {
3198         struct snd_pcm_file * pcm_file;
3199         struct snd_pcm_substream *substream;    
3200         unsigned long offset;
3201         
3202         pcm_file = file->private_data;
3203         substream = pcm_file->substream;
3204         snd_assert(substream != NULL, return -ENXIO);
3205
3206         offset = area->vm_pgoff << PAGE_SHIFT;
3207         switch (offset) {
3208         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3209                 if (substream->no_mmap_ctrl)
3210                         return -ENXIO;
3211                 return snd_pcm_mmap_status(substream, file, area);
3212         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3213                 if (substream->no_mmap_ctrl)
3214                         return -ENXIO;
3215                 return snd_pcm_mmap_control(substream, file, area);
3216         default:
3217                 return snd_pcm_mmap_data(substream, file, area);
3218         }
3219         return 0;
3220 }
3221
3222 static int snd_pcm_fasync(int fd, struct file * file, int on)
3223 {
3224         struct snd_pcm_file * pcm_file;
3225         struct snd_pcm_substream *substream;
3226         struct snd_pcm_runtime *runtime;
3227         int err;
3228
3229         pcm_file = file->private_data;
3230         substream = pcm_file->substream;
3231         snd_assert(substream != NULL, return -ENXIO);
3232         runtime = substream->runtime;
3233
3234         err = fasync_helper(fd, file, on, &runtime->fasync);
3235         if (err < 0)
3236                 return err;
3237         return 0;
3238 }
3239
3240 /*
3241  * ioctl32 compat
3242  */
3243 #ifdef CONFIG_COMPAT
3244 #include "pcm_compat.c"
3245 #else
3246 #define snd_pcm_ioctl_compat    NULL
3247 #endif
3248
3249 /*
3250  *  To be removed helpers to keep binary compatibility
3251  */
3252
3253 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3254 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3255
3256 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3257                                                struct snd_pcm_hw_params_old *oparams)
3258 {
3259         unsigned int i;
3260
3261         memset(params, 0, sizeof(*params));
3262         params->flags = oparams->flags;
3263         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3264                 params->masks[i].bits[0] = oparams->masks[i];
3265         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3266         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3267         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3268         params->info = oparams->info;
3269         params->msbits = oparams->msbits;
3270         params->rate_num = oparams->rate_num;
3271         params->rate_den = oparams->rate_den;
3272         params->fifo_size = oparams->fifo_size;
3273 }
3274
3275 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3276                                              struct snd_pcm_hw_params *params)
3277 {
3278         unsigned int i;
3279
3280         memset(oparams, 0, sizeof(*oparams));
3281         oparams->flags = params->flags;
3282         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3283                 oparams->masks[i] = params->masks[i].bits[0];
3284         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3285         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3286         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3287         oparams->info = params->info;
3288         oparams->msbits = params->msbits;
3289         oparams->rate_num = params->rate_num;
3290         oparams->rate_den = params->rate_den;
3291         oparams->fifo_size = params->fifo_size;
3292 }
3293
3294 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3295                                       struct snd_pcm_hw_params_old __user * _oparams)
3296 {
3297         struct snd_pcm_hw_params *params;
3298         struct snd_pcm_hw_params_old *oparams = NULL;
3299         int err;
3300
3301         params = kmalloc(sizeof(*params), GFP_KERNEL);
3302         if (!params) {
3303                 err = -ENOMEM;
3304                 goto out;
3305         }
3306         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3307         if (!oparams) {
3308                 err = -ENOMEM;
3309                 goto out;
3310         }
3311
3312         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3313                 err = -EFAULT;
3314                 goto out;
3315         }
3316         snd_pcm_hw_convert_from_old_params(params, oparams);
3317         err = snd_pcm_hw_refine(substream, params);
3318         snd_pcm_hw_convert_to_old_params(oparams, params);
3319         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3320                 if (!err)
3321                         err = -EFAULT;
3322         }
3323 out:
3324         kfree(params);
3325         kfree(oparams);
3326         return err;
3327 }
3328
3329 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3330                                       struct snd_pcm_hw_params_old __user * _oparams)
3331 {
3332         struct snd_pcm_hw_params *params;
3333         struct snd_pcm_hw_params_old *oparams = NULL;
3334         int err;
3335
3336         params = kmalloc(sizeof(*params), GFP_KERNEL);
3337         if (!params) {
3338                 err = -ENOMEM;
3339                 goto out;
3340         }
3341         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3342         if (!oparams) {
3343                 err = -ENOMEM;
3344                 goto out;
3345         }
3346         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3347                 err = -EFAULT;
3348                 goto out;
3349         }
3350         snd_pcm_hw_convert_from_old_params(params, oparams);
3351         err = snd_pcm_hw_params(substream, params);
3352         snd_pcm_hw_convert_to_old_params(oparams, params);
3353         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3354                 if (!err)
3355                         err = -EFAULT;
3356         }
3357 out:
3358         kfree(params);
3359         kfree(oparams);
3360         return err;
3361 }
3362
3363 /*
3364  *  Register section
3365  */
3366
3367 static struct file_operations snd_pcm_f_ops_playback = {
3368         .owner =        THIS_MODULE,
3369         .write =        snd_pcm_write,
3370         .writev =       snd_pcm_writev,
3371         .open =         snd_pcm_open,
3372         .release =      snd_pcm_release,
3373         .poll =         snd_pcm_playback_poll,
3374         .unlocked_ioctl =       snd_pcm_playback_ioctl,
3375         .compat_ioctl = snd_pcm_ioctl_compat,
3376         .mmap =         snd_pcm_mmap,
3377         .fasync =       snd_pcm_fasync,
3378 };
3379
3380 static struct file_operations snd_pcm_f_ops_capture = {
3381         .owner =        THIS_MODULE,
3382         .read =         snd_pcm_read,
3383         .readv =        snd_pcm_readv,
3384         .open =         snd_pcm_open,
3385         .release =      snd_pcm_release,
3386         .poll =         snd_pcm_capture_poll,
3387         .unlocked_ioctl =       snd_pcm_capture_ioctl,
3388         .compat_ioctl = snd_pcm_ioctl_compat,
3389         .mmap =         snd_pcm_mmap,
3390         .fasync =       snd_pcm_fasync,
3391 };
3392
3393 struct snd_minor snd_pcm_reg[2] =
3394 {
3395         {
3396                 .comment =      "digital audio playback",
3397                 .f_ops =        &snd_pcm_f_ops_playback,
3398         },
3399         {
3400                 .comment =      "digital audio capture",
3401                 .f_ops =        &snd_pcm_f_ops_capture,
3402         }
3403 };