f49756c1b83709716d8a60a8341dccb7c5f10f4f
[linux-2.6.git] / sound / usb / pcm.c
1 /*
2  *   This program is free software; you can redistribute it and/or modify
3  *   it under the terms of the GNU General Public License as published by
4  *   the Free Software Foundation; either version 2 of the License, or
5  *   (at your option) any later version.
6  *
7  *   This program is distributed in the hope that it will be useful,
8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  *   GNU General Public License for more details.
11  *
12  *   You should have received a copy of the GNU General Public License
13  *   along with this program; if not, write to the Free Software
14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
15  */
16
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/usb.h>
20 #include <linux/usb/audio.h>
21 #include <linux/usb/audio-v2.h>
22
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25 #include <sound/pcm_params.h>
26
27 #include "usbaudio.h"
28 #include "card.h"
29 #include "quirks.h"
30 #include "debug.h"
31 #include "urb.h"
32 #include "helper.h"
33 #include "pcm.h"
34 #include "clock.h"
35
36 /*
37  * return the current pcm pointer.  just based on the hwptr_done value.
38  */
39 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
40 {
41         struct snd_usb_substream *subs;
42         unsigned int hwptr_done;
43
44         subs = (struct snd_usb_substream *)substream->runtime->private_data;
45         spin_lock(&subs->lock);
46         hwptr_done = subs->hwptr_done;
47         spin_unlock(&subs->lock);
48         return hwptr_done / (substream->runtime->frame_bits >> 3);
49 }
50
51 /*
52  * find a matching audio format
53  */
54 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
55                                        unsigned int rate, unsigned int channels)
56 {
57         struct list_head *p;
58         struct audioformat *found = NULL;
59         int cur_attr = 0, attr;
60
61         list_for_each(p, &subs->fmt_list) {
62                 struct audioformat *fp;
63                 fp = list_entry(p, struct audioformat, list);
64                 if (!(fp->formats & (1uLL << format)))
65                         continue;
66                 if (fp->channels != channels)
67                         continue;
68                 if (rate < fp->rate_min || rate > fp->rate_max)
69                         continue;
70                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
71                         unsigned int i;
72                         for (i = 0; i < fp->nr_rates; i++)
73                                 if (fp->rate_table[i] == rate)
74                                         break;
75                         if (i >= fp->nr_rates)
76                                 continue;
77                 }
78                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
79                 if (! found) {
80                         found = fp;
81                         cur_attr = attr;
82                         continue;
83                 }
84                 /* avoid async out and adaptive in if the other method
85                  * supports the same format.
86                  * this is a workaround for the case like
87                  * M-audio audiophile USB.
88                  */
89                 if (attr != cur_attr) {
90                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
91                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
92                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
93                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
94                                 continue;
95                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
96                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
97                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
98                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
99                                 found = fp;
100                                 cur_attr = attr;
101                                 continue;
102                         }
103                 }
104                 /* find the format with the largest max. packet size */
105                 if (fp->maxpacksize > found->maxpacksize) {
106                         found = fp;
107                         cur_attr = attr;
108                 }
109         }
110         return found;
111 }
112
113 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
114                          struct usb_host_interface *alts,
115                          struct audioformat *fmt)
116 {
117         struct usb_device *dev = chip->dev;
118         unsigned int ep;
119         unsigned char data[1];
120         int err;
121
122         ep = get_endpoint(alts, 0)->bEndpointAddress;
123
124         data[0] = 1;
125         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
126                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
127                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
128                                    data, sizeof(data), 1000)) < 0) {
129                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
130                            dev->devnum, iface, ep);
131                 return err;
132         }
133
134         return 0;
135 }
136
137 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
138                          struct usb_host_interface *alts,
139                          struct audioformat *fmt)
140 {
141         struct usb_device *dev = chip->dev;
142         unsigned char data[1];
143         unsigned int ep;
144         int err;
145
146         ep = get_endpoint(alts, 0)->bEndpointAddress;
147
148         data[0] = 1;
149         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
150                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
151                                    UAC2_EP_CS_PITCH << 8, 0,
152                                    data, sizeof(data), 1000)) < 0) {
153                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
154                            dev->devnum, iface, fmt->altsetting);
155                 return err;
156         }
157
158         return 0;
159 }
160
161 /*
162  * initialize the pitch control and sample rate
163  */
164 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
165                        struct usb_host_interface *alts,
166                        struct audioformat *fmt)
167 {
168         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
169
170         /* if endpoint doesn't have pitch control, bail out */
171         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
172                 return 0;
173
174         switch (altsd->bInterfaceProtocol) {
175         case UAC_VERSION_1:
176         default:
177                 return init_pitch_v1(chip, iface, alts, fmt);
178
179         case UAC_VERSION_2:
180                 return init_pitch_v2(chip, iface, alts, fmt);
181         }
182 }
183
184 /*
185  * find a matching format and set up the interface
186  */
187 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
188 {
189         struct usb_device *dev = subs->dev;
190         struct usb_host_interface *alts;
191         struct usb_interface_descriptor *altsd;
192         struct usb_interface *iface;
193         unsigned int ep, attr;
194         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
195         int err;
196
197         iface = usb_ifnum_to_if(dev, fmt->iface);
198         if (WARN_ON(!iface))
199                 return -EINVAL;
200         alts = &iface->altsetting[fmt->altset_idx];
201         altsd = get_iface_desc(alts);
202         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
203                 return -EINVAL;
204
205         if (fmt == subs->cur_audiofmt)
206                 return 0;
207
208         /* close the old interface */
209         if (subs->interface >= 0 && subs->interface != fmt->iface) {
210                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
211                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
212                                 dev->devnum, fmt->iface, fmt->altsetting);
213                         return -EIO;
214                 }
215                 subs->interface = -1;
216                 subs->altset_idx = 0;
217         }
218
219         /* set interface */
220         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
221                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
222                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
223                                    dev->devnum, fmt->iface, fmt->altsetting);
224                         return -EIO;
225                 }
226                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
227                 subs->interface = fmt->iface;
228                 subs->altset_idx = fmt->altset_idx;
229         }
230
231         /* create a data pipe */
232         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
233         if (is_playback)
234                 subs->datapipe = usb_sndisocpipe(dev, ep);
235         else
236                 subs->datapipe = usb_rcvisocpipe(dev, ep);
237         subs->datainterval = fmt->datainterval;
238         subs->syncpipe = subs->syncinterval = 0;
239         subs->maxpacksize = fmt->maxpacksize;
240         subs->fill_max = 0;
241
242         /* we need a sync pipe in async OUT or adaptive IN mode */
243         /* check the number of EP, since some devices have broken
244          * descriptors which fool us.  if it has only one EP,
245          * assume it as adaptive-out or sync-in.
246          */
247         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
248         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
249              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
250             altsd->bNumEndpoints >= 2) {
251                 /* check sync-pipe endpoint */
252                 /* ... and check descriptor size before accessing bSynchAddress
253                    because there is a version of the SB Audigy 2 NX firmware lacking
254                    the audio fields in the endpoint descriptors */
255                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
256                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
257                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
258                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
259                                    dev->devnum, fmt->iface, fmt->altsetting);
260                         return -EINVAL;
261                 }
262                 ep = get_endpoint(alts, 1)->bEndpointAddress;
263                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
264                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
265                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
266                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
267                                    dev->devnum, fmt->iface, fmt->altsetting);
268                         return -EINVAL;
269                 }
270                 ep &= USB_ENDPOINT_NUMBER_MASK;
271                 if (is_playback)
272                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
273                 else
274                         subs->syncpipe = usb_sndisocpipe(dev, ep);
275                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
276                     get_endpoint(alts, 1)->bRefresh >= 1 &&
277                     get_endpoint(alts, 1)->bRefresh <= 9)
278                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
279                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
280                         subs->syncinterval = 1;
281                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
282                          get_endpoint(alts, 1)->bInterval <= 16)
283                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
284                 else
285                         subs->syncinterval = 3;
286         }
287
288         /* always fill max packet size */
289         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
290                 subs->fill_max = 1;
291
292         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
293                 return err;
294
295         subs->cur_audiofmt = fmt;
296
297         snd_usb_set_format_quirk(subs, fmt);
298
299 #if 0
300         printk(KERN_DEBUG
301                "setting done: format = %d, rate = %d..%d, channels = %d\n",
302                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
303         printk(KERN_DEBUG
304                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
305                subs->datapipe, subs->syncpipe);
306 #endif
307
308         return 0;
309 }
310
311 /*
312  * hw_params callback
313  *
314  * allocate a buffer and set the given audio format.
315  *
316  * so far we use a physically linear buffer although packetize transfer
317  * doesn't need a continuous area.
318  * if sg buffer is supported on the later version of alsa, we'll follow
319  * that.
320  */
321 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
322                              struct snd_pcm_hw_params *hw_params)
323 {
324         struct snd_usb_substream *subs = substream->runtime->private_data;
325         struct audioformat *fmt;
326         unsigned int channels, rate, format;
327         int ret, changed;
328
329         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
330                                                params_buffer_bytes(hw_params));
331         if (ret < 0)
332                 return ret;
333
334         format = params_format(hw_params);
335         rate = params_rate(hw_params);
336         channels = params_channels(hw_params);
337         fmt = find_format(subs, format, rate, channels);
338         if (!fmt) {
339                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
340                            format, rate, channels);
341                 return -EINVAL;
342         }
343
344         changed = subs->cur_audiofmt != fmt ||
345                 subs->period_bytes != params_period_bytes(hw_params) ||
346                 subs->cur_rate != rate;
347         if ((ret = set_format(subs, fmt)) < 0)
348                 return ret;
349
350         if (subs->cur_rate != rate) {
351                 struct usb_host_interface *alts;
352                 struct usb_interface *iface;
353                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
354                 alts = &iface->altsetting[fmt->altset_idx];
355                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
356                 if (ret < 0)
357                         return ret;
358                 subs->cur_rate = rate;
359         }
360
361         if (changed) {
362                 /* format changed */
363                 snd_usb_release_substream_urbs(subs, 0);
364                 /* influenced: period_bytes, channels, rate, format, */
365                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
366                                                   params_rate(hw_params),
367                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
368                                                         params_channels(hw_params));
369         }
370
371         return ret;
372 }
373
374 /*
375  * hw_free callback
376  *
377  * reset the audio format and release the buffer
378  */
379 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
380 {
381         struct snd_usb_substream *subs = substream->runtime->private_data;
382
383         subs->cur_audiofmt = NULL;
384         subs->cur_rate = 0;
385         subs->period_bytes = 0;
386         if (!subs->stream->chip->shutdown)
387                 snd_usb_release_substream_urbs(subs, 0);
388         return snd_pcm_lib_free_vmalloc_buffer(substream);
389 }
390
391 /*
392  * prepare callback
393  *
394  * only a few subtle things...
395  */
396 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
397 {
398         struct snd_pcm_runtime *runtime = substream->runtime;
399         struct snd_usb_substream *subs = runtime->private_data;
400
401         if (! subs->cur_audiofmt) {
402                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
403                 return -ENXIO;
404         }
405
406         /* some unit conversions in runtime */
407         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
408         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
409
410         /* reset the pointer */
411         subs->hwptr_done = 0;
412         subs->transfer_done = 0;
413         subs->phase = 0;
414         runtime->delay = 0;
415
416         return snd_usb_substream_prepare(subs, runtime);
417 }
418
419 static struct snd_pcm_hardware snd_usb_hardware =
420 {
421         .info =                 SNDRV_PCM_INFO_MMAP |
422                                 SNDRV_PCM_INFO_MMAP_VALID |
423                                 SNDRV_PCM_INFO_BATCH |
424                                 SNDRV_PCM_INFO_INTERLEAVED |
425                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
426                                 SNDRV_PCM_INFO_PAUSE,
427         .buffer_bytes_max =     1024 * 1024,
428         .period_bytes_min =     64,
429         .period_bytes_max =     512 * 1024,
430         .periods_min =          2,
431         .periods_max =          1024,
432 };
433
434 static int hw_check_valid_format(struct snd_usb_substream *subs,
435                                  struct snd_pcm_hw_params *params,
436                                  struct audioformat *fp)
437 {
438         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
439         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
440         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
441         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
442         struct snd_mask check_fmts;
443         unsigned int ptime;
444
445         /* check the format */
446         snd_mask_none(&check_fmts);
447         check_fmts.bits[0] = (u32)fp->formats;
448         check_fmts.bits[1] = (u32)(fp->formats >> 32);
449         snd_mask_intersect(&check_fmts, fmts);
450         if (snd_mask_empty(&check_fmts)) {
451                 hwc_debug("   > check: no supported format %d\n", fp->format);
452                 return 0;
453         }
454         /* check the channels */
455         if (fp->channels < ct->min || fp->channels > ct->max) {
456                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
457                 return 0;
458         }
459         /* check the rate is within the range */
460         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
461                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
462                 return 0;
463         }
464         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
465                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
466                 return 0;
467         }
468         /* check whether the period time is >= the data packet interval */
469         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
470                 ptime = 125 * (1 << fp->datainterval);
471                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
472                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
473                         return 0;
474                 }
475         }
476         return 1;
477 }
478
479 static int hw_rule_rate(struct snd_pcm_hw_params *params,
480                         struct snd_pcm_hw_rule *rule)
481 {
482         struct snd_usb_substream *subs = rule->private;
483         struct list_head *p;
484         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
485         unsigned int rmin, rmax;
486         int changed;
487
488         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
489         changed = 0;
490         rmin = rmax = 0;
491         list_for_each(p, &subs->fmt_list) {
492                 struct audioformat *fp;
493                 fp = list_entry(p, struct audioformat, list);
494                 if (!hw_check_valid_format(subs, params, fp))
495                         continue;
496                 if (changed++) {
497                         if (rmin > fp->rate_min)
498                                 rmin = fp->rate_min;
499                         if (rmax < fp->rate_max)
500                                 rmax = fp->rate_max;
501                 } else {
502                         rmin = fp->rate_min;
503                         rmax = fp->rate_max;
504                 }
505         }
506
507         if (!changed) {
508                 hwc_debug("  --> get empty\n");
509                 it->empty = 1;
510                 return -EINVAL;
511         }
512
513         changed = 0;
514         if (it->min < rmin) {
515                 it->min = rmin;
516                 it->openmin = 0;
517                 changed = 1;
518         }
519         if (it->max > rmax) {
520                 it->max = rmax;
521                 it->openmax = 0;
522                 changed = 1;
523         }
524         if (snd_interval_checkempty(it)) {
525                 it->empty = 1;
526                 return -EINVAL;
527         }
528         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
529         return changed;
530 }
531
532
533 static int hw_rule_channels(struct snd_pcm_hw_params *params,
534                             struct snd_pcm_hw_rule *rule)
535 {
536         struct snd_usb_substream *subs = rule->private;
537         struct list_head *p;
538         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
539         unsigned int rmin, rmax;
540         int changed;
541
542         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
543         changed = 0;
544         rmin = rmax = 0;
545         list_for_each(p, &subs->fmt_list) {
546                 struct audioformat *fp;
547                 fp = list_entry(p, struct audioformat, list);
548                 if (!hw_check_valid_format(subs, params, fp))
549                         continue;
550                 if (changed++) {
551                         if (rmin > fp->channels)
552                                 rmin = fp->channels;
553                         if (rmax < fp->channels)
554                                 rmax = fp->channels;
555                 } else {
556                         rmin = fp->channels;
557                         rmax = fp->channels;
558                 }
559         }
560
561         if (!changed) {
562                 hwc_debug("  --> get empty\n");
563                 it->empty = 1;
564                 return -EINVAL;
565         }
566
567         changed = 0;
568         if (it->min < rmin) {
569                 it->min = rmin;
570                 it->openmin = 0;
571                 changed = 1;
572         }
573         if (it->max > rmax) {
574                 it->max = rmax;
575                 it->openmax = 0;
576                 changed = 1;
577         }
578         if (snd_interval_checkempty(it)) {
579                 it->empty = 1;
580                 return -EINVAL;
581         }
582         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
583         return changed;
584 }
585
586 static int hw_rule_format(struct snd_pcm_hw_params *params,
587                           struct snd_pcm_hw_rule *rule)
588 {
589         struct snd_usb_substream *subs = rule->private;
590         struct list_head *p;
591         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
592         u64 fbits;
593         u32 oldbits[2];
594         int changed;
595
596         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
597         fbits = 0;
598         list_for_each(p, &subs->fmt_list) {
599                 struct audioformat *fp;
600                 fp = list_entry(p, struct audioformat, list);
601                 if (!hw_check_valid_format(subs, params, fp))
602                         continue;
603                 fbits |= fp->formats;
604         }
605
606         oldbits[0] = fmt->bits[0];
607         oldbits[1] = fmt->bits[1];
608         fmt->bits[0] &= (u32)fbits;
609         fmt->bits[1] &= (u32)(fbits >> 32);
610         if (!fmt->bits[0] && !fmt->bits[1]) {
611                 hwc_debug("  --> get empty\n");
612                 return -EINVAL;
613         }
614         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
615         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
616         return changed;
617 }
618
619 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
620                                struct snd_pcm_hw_rule *rule)
621 {
622         struct snd_usb_substream *subs = rule->private;
623         struct audioformat *fp;
624         struct snd_interval *it;
625         unsigned char min_datainterval;
626         unsigned int pmin;
627         int changed;
628
629         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
630         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
631         min_datainterval = 0xff;
632         list_for_each_entry(fp, &subs->fmt_list, list) {
633                 if (!hw_check_valid_format(subs, params, fp))
634                         continue;
635                 min_datainterval = min(min_datainterval, fp->datainterval);
636         }
637         if (min_datainterval == 0xff) {
638                 hwc_debug("  --> get empty\n");
639                 it->empty = 1;
640                 return -EINVAL;
641         }
642         pmin = 125 * (1 << min_datainterval);
643         changed = 0;
644         if (it->min < pmin) {
645                 it->min = pmin;
646                 it->openmin = 0;
647                 changed = 1;
648         }
649         if (snd_interval_checkempty(it)) {
650                 it->empty = 1;
651                 return -EINVAL;
652         }
653         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
654         return changed;
655 }
656
657 /*
658  *  If the device supports unusual bit rates, does the request meet these?
659  */
660 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
661                                   struct snd_usb_substream *subs)
662 {
663         struct audioformat *fp;
664         int count = 0, needs_knot = 0;
665         int err;
666
667         list_for_each_entry(fp, &subs->fmt_list, list) {
668                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
669                         return 0;
670                 count += fp->nr_rates;
671                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
672                         needs_knot = 1;
673         }
674         if (!needs_knot)
675                 return 0;
676
677         subs->rate_list.count = count;
678         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
679         subs->rate_list.mask = 0;
680         count = 0;
681         list_for_each_entry(fp, &subs->fmt_list, list) {
682                 int i;
683                 for (i = 0; i < fp->nr_rates; i++)
684                         subs->rate_list.list[count++] = fp->rate_table[i];
685         }
686         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
687                                          &subs->rate_list);
688         if (err < 0)
689                 return err;
690
691         return 0;
692 }
693
694
695 /*
696  * set up the runtime hardware information.
697  */
698
699 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
700 {
701         struct list_head *p;
702         unsigned int pt, ptmin;
703         int param_period_time_if_needed;
704         int err;
705
706         runtime->hw.formats = subs->formats;
707
708         runtime->hw.rate_min = 0x7fffffff;
709         runtime->hw.rate_max = 0;
710         runtime->hw.channels_min = 256;
711         runtime->hw.channels_max = 0;
712         runtime->hw.rates = 0;
713         ptmin = UINT_MAX;
714         /* check min/max rates and channels */
715         list_for_each(p, &subs->fmt_list) {
716                 struct audioformat *fp;
717                 fp = list_entry(p, struct audioformat, list);
718                 runtime->hw.rates |= fp->rates;
719                 if (runtime->hw.rate_min > fp->rate_min)
720                         runtime->hw.rate_min = fp->rate_min;
721                 if (runtime->hw.rate_max < fp->rate_max)
722                         runtime->hw.rate_max = fp->rate_max;
723                 if (runtime->hw.channels_min > fp->channels)
724                         runtime->hw.channels_min = fp->channels;
725                 if (runtime->hw.channels_max < fp->channels)
726                         runtime->hw.channels_max = fp->channels;
727                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
728                         /* FIXME: there might be more than one audio formats... */
729                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
730                                 fp->frame_size;
731                 }
732                 pt = 125 * (1 << fp->datainterval);
733                 ptmin = min(ptmin, pt);
734         }
735
736         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
737         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
738                 /* full speed devices have fixed data packet interval */
739                 ptmin = 1000;
740         if (ptmin == 1000)
741                 /* if period time doesn't go below 1 ms, no rules needed */
742                 param_period_time_if_needed = -1;
743         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
744                                      ptmin, UINT_MAX);
745
746         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
747                                        hw_rule_rate, subs,
748                                        SNDRV_PCM_HW_PARAM_FORMAT,
749                                        SNDRV_PCM_HW_PARAM_CHANNELS,
750                                        param_period_time_if_needed,
751                                        -1)) < 0)
752                 return err;
753         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
754                                        hw_rule_channels, subs,
755                                        SNDRV_PCM_HW_PARAM_FORMAT,
756                                        SNDRV_PCM_HW_PARAM_RATE,
757                                        param_period_time_if_needed,
758                                        -1)) < 0)
759                 return err;
760         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
761                                        hw_rule_format, subs,
762                                        SNDRV_PCM_HW_PARAM_RATE,
763                                        SNDRV_PCM_HW_PARAM_CHANNELS,
764                                        param_period_time_if_needed,
765                                        -1)) < 0)
766                 return err;
767         if (param_period_time_if_needed >= 0) {
768                 err = snd_pcm_hw_rule_add(runtime, 0,
769                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
770                                           hw_rule_period_time, subs,
771                                           SNDRV_PCM_HW_PARAM_FORMAT,
772                                           SNDRV_PCM_HW_PARAM_CHANNELS,
773                                           SNDRV_PCM_HW_PARAM_RATE,
774                                           -1);
775                 if (err < 0)
776                         return err;
777         }
778         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
779                 return err;
780         return 0;
781 }
782
783 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
784 {
785         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
786         struct snd_pcm_runtime *runtime = substream->runtime;
787         struct snd_usb_substream *subs = &as->substream[direction];
788
789         subs->interface = -1;
790         subs->altset_idx = 0;
791         runtime->hw = snd_usb_hardware;
792         runtime->private_data = subs;
793         subs->pcm_substream = substream;
794         return setup_hw_info(runtime, subs);
795 }
796
797 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
798 {
799         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
800         struct snd_usb_substream *subs = &as->substream[direction];
801
802         if (!as->chip->shutdown && subs->interface >= 0) {
803                 usb_set_interface(subs->dev, subs->interface, 0);
804                 subs->interface = -1;
805         }
806         subs->pcm_substream = NULL;
807         return 0;
808 }
809
810 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
811 {
812         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
813 }
814
815 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
816 {
817         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
818 }
819
820 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
821 {
822         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
823 }
824
825 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
826 {
827         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
828 }
829
830 static struct snd_pcm_ops snd_usb_playback_ops = {
831         .open =         snd_usb_playback_open,
832         .close =        snd_usb_playback_close,
833         .ioctl =        snd_pcm_lib_ioctl,
834         .hw_params =    snd_usb_hw_params,
835         .hw_free =      snd_usb_hw_free,
836         .prepare =      snd_usb_pcm_prepare,
837         .trigger =      snd_usb_substream_playback_trigger,
838         .pointer =      snd_usb_pcm_pointer,
839         .page =         snd_pcm_lib_get_vmalloc_page,
840         .mmap =         snd_pcm_lib_mmap_vmalloc,
841 };
842
843 static struct snd_pcm_ops snd_usb_capture_ops = {
844         .open =         snd_usb_capture_open,
845         .close =        snd_usb_capture_close,
846         .ioctl =        snd_pcm_lib_ioctl,
847         .hw_params =    snd_usb_hw_params,
848         .hw_free =      snd_usb_hw_free,
849         .prepare =      snd_usb_pcm_prepare,
850         .trigger =      snd_usb_substream_capture_trigger,
851         .pointer =      snd_usb_pcm_pointer,
852         .page =         snd_pcm_lib_get_vmalloc_page,
853         .mmap =         snd_pcm_lib_mmap_vmalloc,
854 };
855
856 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
857 {
858         snd_pcm_set_ops(pcm, stream,
859                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
860                         &snd_usb_playback_ops : &snd_usb_capture_ops);
861 }