ALSA: usb-audio: more control quirks for M-Audio FastTrack devices
[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 #include "power.h"
36
37 /*
38  * return the current pcm pointer.  just based on the hwptr_done value.
39  */
40 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
41 {
42         struct snd_usb_substream *subs;
43         unsigned int hwptr_done;
44
45         subs = (struct snd_usb_substream *)substream->runtime->private_data;
46         spin_lock(&subs->lock);
47         hwptr_done = subs->hwptr_done;
48         spin_unlock(&subs->lock);
49         return hwptr_done / (substream->runtime->frame_bits >> 3);
50 }
51
52 /*
53  * find a matching audio format
54  */
55 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
56                                        unsigned int rate, unsigned int channels)
57 {
58         struct list_head *p;
59         struct audioformat *found = NULL;
60         int cur_attr = 0, attr;
61
62         list_for_each(p, &subs->fmt_list) {
63                 struct audioformat *fp;
64                 fp = list_entry(p, struct audioformat, list);
65                 if (!(fp->formats & (1uLL << format)))
66                         continue;
67                 if (fp->channels != channels)
68                         continue;
69                 if (rate < fp->rate_min || rate > fp->rate_max)
70                         continue;
71                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
72                         unsigned int i;
73                         for (i = 0; i < fp->nr_rates; i++)
74                                 if (fp->rate_table[i] == rate)
75                                         break;
76                         if (i >= fp->nr_rates)
77                                 continue;
78                 }
79                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
80                 if (! found) {
81                         found = fp;
82                         cur_attr = attr;
83                         continue;
84                 }
85                 /* avoid async out and adaptive in if the other method
86                  * supports the same format.
87                  * this is a workaround for the case like
88                  * M-audio audiophile USB.
89                  */
90                 if (attr != cur_attr) {
91                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
92                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
93                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
94                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
95                                 continue;
96                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
97                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
98                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
99                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
100                                 found = fp;
101                                 cur_attr = attr;
102                                 continue;
103                         }
104                 }
105                 /* find the format with the largest max. packet size */
106                 if (fp->maxpacksize > found->maxpacksize) {
107                         found = fp;
108                         cur_attr = attr;
109                 }
110         }
111         return found;
112 }
113
114 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
115                          struct usb_host_interface *alts,
116                          struct audioformat *fmt)
117 {
118         struct usb_device *dev = chip->dev;
119         unsigned int ep;
120         unsigned char data[1];
121         int err;
122
123         ep = get_endpoint(alts, 0)->bEndpointAddress;
124
125         data[0] = 1;
126         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
127                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
128                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
129                                    data, sizeof(data), 1000)) < 0) {
130                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
131                            dev->devnum, iface, ep);
132                 return err;
133         }
134
135         return 0;
136 }
137
138 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
139                          struct usb_host_interface *alts,
140                          struct audioformat *fmt)
141 {
142         struct usb_device *dev = chip->dev;
143         unsigned char data[1];
144         unsigned int ep;
145         int err;
146
147         ep = get_endpoint(alts, 0)->bEndpointAddress;
148
149         data[0] = 1;
150         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
151                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
152                                    UAC2_EP_CS_PITCH << 8, 0,
153                                    data, sizeof(data), 1000)) < 0) {
154                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
155                            dev->devnum, iface, fmt->altsetting);
156                 return err;
157         }
158
159         return 0;
160 }
161
162 /*
163  * initialize the pitch control and sample rate
164  */
165 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
166                        struct usb_host_interface *alts,
167                        struct audioformat *fmt)
168 {
169         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
170
171         /* if endpoint doesn't have pitch control, bail out */
172         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
173                 return 0;
174
175         switch (altsd->bInterfaceProtocol) {
176         case UAC_VERSION_1:
177         default:
178                 return init_pitch_v1(chip, iface, alts, fmt);
179
180         case UAC_VERSION_2:
181                 return init_pitch_v2(chip, iface, alts, fmt);
182         }
183 }
184
185 /*
186  * find a matching format and set up the interface
187  */
188 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
189 {
190         struct usb_device *dev = subs->dev;
191         struct usb_host_interface *alts;
192         struct usb_interface_descriptor *altsd;
193         struct usb_interface *iface;
194         unsigned int ep, attr;
195         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
196         int err;
197
198         iface = usb_ifnum_to_if(dev, fmt->iface);
199         if (WARN_ON(!iface))
200                 return -EINVAL;
201         alts = &iface->altsetting[fmt->altset_idx];
202         altsd = get_iface_desc(alts);
203         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
204                 return -EINVAL;
205
206         if (fmt == subs->cur_audiofmt)
207                 return 0;
208
209         /* close the old interface */
210         if (subs->interface >= 0 && subs->interface != fmt->iface) {
211                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
212                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
213                                 dev->devnum, fmt->iface, fmt->altsetting);
214                         return -EIO;
215                 }
216                 subs->interface = -1;
217                 subs->altset_idx = 0;
218         }
219
220         /* set interface */
221         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
222                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
223                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
224                                    dev->devnum, fmt->iface, fmt->altsetting);
225                         return -EIO;
226                 }
227                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
228                 subs->interface = fmt->iface;
229                 subs->altset_idx = fmt->altset_idx;
230         }
231
232         /* create a data pipe */
233         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
234         if (is_playback)
235                 subs->datapipe = usb_sndisocpipe(dev, ep);
236         else
237                 subs->datapipe = usb_rcvisocpipe(dev, ep);
238         subs->datainterval = fmt->datainterval;
239         subs->syncpipe = subs->syncinterval = 0;
240         subs->maxpacksize = fmt->maxpacksize;
241         subs->syncmaxsize = 0;
242         subs->fill_max = 0;
243
244         /* we need a sync pipe in async OUT or adaptive IN mode */
245         /* check the number of EP, since some devices have broken
246          * descriptors which fool us.  if it has only one EP,
247          * assume it as adaptive-out or sync-in.
248          */
249         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
250         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
251              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
252             altsd->bNumEndpoints >= 2) {
253                 /* check sync-pipe endpoint */
254                 /* ... and check descriptor size before accessing bSynchAddress
255                    because there is a version of the SB Audigy 2 NX firmware lacking
256                    the audio fields in the endpoint descriptors */
257                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
258                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
259                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
260                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
261                                    dev->devnum, fmt->iface, fmt->altsetting);
262                         return -EINVAL;
263                 }
264                 ep = get_endpoint(alts, 1)->bEndpointAddress;
265                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
266                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
267                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
268                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
269                                    dev->devnum, fmt->iface, fmt->altsetting);
270                         return -EINVAL;
271                 }
272                 ep &= USB_ENDPOINT_NUMBER_MASK;
273                 if (is_playback)
274                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
275                 else
276                         subs->syncpipe = usb_sndisocpipe(dev, ep);
277                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
278                     get_endpoint(alts, 1)->bRefresh >= 1 &&
279                     get_endpoint(alts, 1)->bRefresh <= 9)
280                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
281                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
282                         subs->syncinterval = 1;
283                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
284                          get_endpoint(alts, 1)->bInterval <= 16)
285                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
286                 else
287                         subs->syncinterval = 3;
288                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
289         }
290
291         /* always fill max packet size */
292         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
293                 subs->fill_max = 1;
294
295         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
296                 return err;
297
298         subs->cur_audiofmt = fmt;
299
300         snd_usb_set_format_quirk(subs, fmt);
301
302 #if 0
303         printk(KERN_DEBUG
304                "setting done: format = %d, rate = %d..%d, channels = %d\n",
305                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
306         printk(KERN_DEBUG
307                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
308                subs->datapipe, subs->syncpipe);
309 #endif
310
311         return 0;
312 }
313
314 /*
315  * hw_params callback
316  *
317  * allocate a buffer and set the given audio format.
318  *
319  * so far we use a physically linear buffer although packetize transfer
320  * doesn't need a continuous area.
321  * if sg buffer is supported on the later version of alsa, we'll follow
322  * that.
323  */
324 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
325                              struct snd_pcm_hw_params *hw_params)
326 {
327         struct snd_usb_substream *subs = substream->runtime->private_data;
328         struct audioformat *fmt;
329         unsigned int channels, rate, format;
330         int ret, changed;
331
332         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
333                                                params_buffer_bytes(hw_params));
334         if (ret < 0)
335                 return ret;
336
337         format = params_format(hw_params);
338         rate = params_rate(hw_params);
339         channels = params_channels(hw_params);
340         fmt = find_format(subs, format, rate, channels);
341         if (!fmt) {
342                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
343                            format, rate, channels);
344                 return -EINVAL;
345         }
346
347         changed = subs->cur_audiofmt != fmt ||
348                 subs->period_bytes != params_period_bytes(hw_params) ||
349                 subs->cur_rate != rate;
350         if ((ret = set_format(subs, fmt)) < 0)
351                 return ret;
352
353         if (subs->cur_rate != rate) {
354                 struct usb_host_interface *alts;
355                 struct usb_interface *iface;
356                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
357                 alts = &iface->altsetting[fmt->altset_idx];
358                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
359                 if (ret < 0)
360                         return ret;
361                 subs->cur_rate = rate;
362         }
363
364         if (changed) {
365                 mutex_lock(&subs->stream->chip->shutdown_mutex);
366                 /* format changed */
367                 snd_usb_release_substream_urbs(subs, 0);
368                 /* influenced: period_bytes, channels, rate, format, */
369                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
370                                                   params_rate(hw_params),
371                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
372                                                         params_channels(hw_params));
373                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
374         }
375
376         return ret;
377 }
378
379 /*
380  * hw_free callback
381  *
382  * reset the audio format and release the buffer
383  */
384 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
385 {
386         struct snd_usb_substream *subs = substream->runtime->private_data;
387
388         subs->cur_audiofmt = NULL;
389         subs->cur_rate = 0;
390         subs->period_bytes = 0;
391         mutex_lock(&subs->stream->chip->shutdown_mutex);
392         snd_usb_release_substream_urbs(subs, 0);
393         mutex_unlock(&subs->stream->chip->shutdown_mutex);
394         return snd_pcm_lib_free_vmalloc_buffer(substream);
395 }
396
397 /*
398  * prepare callback
399  *
400  * only a few subtle things...
401  */
402 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
403 {
404         struct snd_pcm_runtime *runtime = substream->runtime;
405         struct snd_usb_substream *subs = runtime->private_data;
406
407         if (! subs->cur_audiofmt) {
408                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
409                 return -ENXIO;
410         }
411
412         /* some unit conversions in runtime */
413         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
414         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
415
416         /* reset the pointer */
417         subs->hwptr_done = 0;
418         subs->transfer_done = 0;
419         subs->phase = 0;
420         runtime->delay = 0;
421
422         return snd_usb_substream_prepare(subs, runtime);
423 }
424
425 static struct snd_pcm_hardware snd_usb_hardware =
426 {
427         .info =                 SNDRV_PCM_INFO_MMAP |
428                                 SNDRV_PCM_INFO_MMAP_VALID |
429                                 SNDRV_PCM_INFO_BATCH |
430                                 SNDRV_PCM_INFO_INTERLEAVED |
431                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
432                                 SNDRV_PCM_INFO_PAUSE,
433         .buffer_bytes_max =     1024 * 1024,
434         .period_bytes_min =     64,
435         .period_bytes_max =     512 * 1024,
436         .periods_min =          2,
437         .periods_max =          1024,
438 };
439
440 static int hw_check_valid_format(struct snd_usb_substream *subs,
441                                  struct snd_pcm_hw_params *params,
442                                  struct audioformat *fp)
443 {
444         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
445         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
446         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
447         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
448         struct snd_mask check_fmts;
449         unsigned int ptime;
450
451         /* check the format */
452         snd_mask_none(&check_fmts);
453         check_fmts.bits[0] = (u32)fp->formats;
454         check_fmts.bits[1] = (u32)(fp->formats >> 32);
455         snd_mask_intersect(&check_fmts, fmts);
456         if (snd_mask_empty(&check_fmts)) {
457                 hwc_debug("   > check: no supported format %d\n", fp->format);
458                 return 0;
459         }
460         /* check the channels */
461         if (fp->channels < ct->min || fp->channels > ct->max) {
462                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
463                 return 0;
464         }
465         /* check the rate is within the range */
466         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
467                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
468                 return 0;
469         }
470         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
471                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
472                 return 0;
473         }
474         /* check whether the period time is >= the data packet interval */
475         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
476                 ptime = 125 * (1 << fp->datainterval);
477                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
478                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
479                         return 0;
480                 }
481         }
482         return 1;
483 }
484
485 static int hw_rule_rate(struct snd_pcm_hw_params *params,
486                         struct snd_pcm_hw_rule *rule)
487 {
488         struct snd_usb_substream *subs = rule->private;
489         struct list_head *p;
490         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
491         unsigned int rmin, rmax;
492         int changed;
493
494         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
495         changed = 0;
496         rmin = rmax = 0;
497         list_for_each(p, &subs->fmt_list) {
498                 struct audioformat *fp;
499                 fp = list_entry(p, struct audioformat, list);
500                 if (!hw_check_valid_format(subs, params, fp))
501                         continue;
502                 if (changed++) {
503                         if (rmin > fp->rate_min)
504                                 rmin = fp->rate_min;
505                         if (rmax < fp->rate_max)
506                                 rmax = fp->rate_max;
507                 } else {
508                         rmin = fp->rate_min;
509                         rmax = fp->rate_max;
510                 }
511         }
512
513         if (!changed) {
514                 hwc_debug("  --> get empty\n");
515                 it->empty = 1;
516                 return -EINVAL;
517         }
518
519         changed = 0;
520         if (it->min < rmin) {
521                 it->min = rmin;
522                 it->openmin = 0;
523                 changed = 1;
524         }
525         if (it->max > rmax) {
526                 it->max = rmax;
527                 it->openmax = 0;
528                 changed = 1;
529         }
530         if (snd_interval_checkempty(it)) {
531                 it->empty = 1;
532                 return -EINVAL;
533         }
534         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
535         return changed;
536 }
537
538
539 static int hw_rule_channels(struct snd_pcm_hw_params *params,
540                             struct snd_pcm_hw_rule *rule)
541 {
542         struct snd_usb_substream *subs = rule->private;
543         struct list_head *p;
544         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
545         unsigned int rmin, rmax;
546         int changed;
547
548         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
549         changed = 0;
550         rmin = rmax = 0;
551         list_for_each(p, &subs->fmt_list) {
552                 struct audioformat *fp;
553                 fp = list_entry(p, struct audioformat, list);
554                 if (!hw_check_valid_format(subs, params, fp))
555                         continue;
556                 if (changed++) {
557                         if (rmin > fp->channels)
558                                 rmin = fp->channels;
559                         if (rmax < fp->channels)
560                                 rmax = fp->channels;
561                 } else {
562                         rmin = fp->channels;
563                         rmax = fp->channels;
564                 }
565         }
566
567         if (!changed) {
568                 hwc_debug("  --> get empty\n");
569                 it->empty = 1;
570                 return -EINVAL;
571         }
572
573         changed = 0;
574         if (it->min < rmin) {
575                 it->min = rmin;
576                 it->openmin = 0;
577                 changed = 1;
578         }
579         if (it->max > rmax) {
580                 it->max = rmax;
581                 it->openmax = 0;
582                 changed = 1;
583         }
584         if (snd_interval_checkempty(it)) {
585                 it->empty = 1;
586                 return -EINVAL;
587         }
588         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
589         return changed;
590 }
591
592 static int hw_rule_format(struct snd_pcm_hw_params *params,
593                           struct snd_pcm_hw_rule *rule)
594 {
595         struct snd_usb_substream *subs = rule->private;
596         struct list_head *p;
597         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
598         u64 fbits;
599         u32 oldbits[2];
600         int changed;
601
602         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
603         fbits = 0;
604         list_for_each(p, &subs->fmt_list) {
605                 struct audioformat *fp;
606                 fp = list_entry(p, struct audioformat, list);
607                 if (!hw_check_valid_format(subs, params, fp))
608                         continue;
609                 fbits |= fp->formats;
610         }
611
612         oldbits[0] = fmt->bits[0];
613         oldbits[1] = fmt->bits[1];
614         fmt->bits[0] &= (u32)fbits;
615         fmt->bits[1] &= (u32)(fbits >> 32);
616         if (!fmt->bits[0] && !fmt->bits[1]) {
617                 hwc_debug("  --> get empty\n");
618                 return -EINVAL;
619         }
620         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
621         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
622         return changed;
623 }
624
625 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
626                                struct snd_pcm_hw_rule *rule)
627 {
628         struct snd_usb_substream *subs = rule->private;
629         struct audioformat *fp;
630         struct snd_interval *it;
631         unsigned char min_datainterval;
632         unsigned int pmin;
633         int changed;
634
635         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
636         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
637         min_datainterval = 0xff;
638         list_for_each_entry(fp, &subs->fmt_list, list) {
639                 if (!hw_check_valid_format(subs, params, fp))
640                         continue;
641                 min_datainterval = min(min_datainterval, fp->datainterval);
642         }
643         if (min_datainterval == 0xff) {
644                 hwc_debug("  --> get empty\n");
645                 it->empty = 1;
646                 return -EINVAL;
647         }
648         pmin = 125 * (1 << min_datainterval);
649         changed = 0;
650         if (it->min < pmin) {
651                 it->min = pmin;
652                 it->openmin = 0;
653                 changed = 1;
654         }
655         if (snd_interval_checkempty(it)) {
656                 it->empty = 1;
657                 return -EINVAL;
658         }
659         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
660         return changed;
661 }
662
663 /*
664  *  If the device supports unusual bit rates, does the request meet these?
665  */
666 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
667                                   struct snd_usb_substream *subs)
668 {
669         struct audioformat *fp;
670         int count = 0, needs_knot = 0;
671         int err;
672
673         list_for_each_entry(fp, &subs->fmt_list, list) {
674                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
675                         return 0;
676                 count += fp->nr_rates;
677                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
678                         needs_knot = 1;
679         }
680         if (!needs_knot)
681                 return 0;
682
683         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
684         if (!subs->rate_list.list)
685                 return -ENOMEM;
686         subs->rate_list.count = count;
687         subs->rate_list.mask = 0;
688         count = 0;
689         list_for_each_entry(fp, &subs->fmt_list, list) {
690                 int i;
691                 for (i = 0; i < fp->nr_rates; i++)
692                         subs->rate_list.list[count++] = fp->rate_table[i];
693         }
694         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
695                                          &subs->rate_list);
696         if (err < 0)
697                 return err;
698
699         return 0;
700 }
701
702
703 /*
704  * set up the runtime hardware information.
705  */
706
707 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
708 {
709         struct list_head *p;
710         unsigned int pt, ptmin;
711         int param_period_time_if_needed;
712         int err;
713
714         runtime->hw.formats = subs->formats;
715
716         runtime->hw.rate_min = 0x7fffffff;
717         runtime->hw.rate_max = 0;
718         runtime->hw.channels_min = 256;
719         runtime->hw.channels_max = 0;
720         runtime->hw.rates = 0;
721         ptmin = UINT_MAX;
722         /* check min/max rates and channels */
723         list_for_each(p, &subs->fmt_list) {
724                 struct audioformat *fp;
725                 fp = list_entry(p, struct audioformat, list);
726                 runtime->hw.rates |= fp->rates;
727                 if (runtime->hw.rate_min > fp->rate_min)
728                         runtime->hw.rate_min = fp->rate_min;
729                 if (runtime->hw.rate_max < fp->rate_max)
730                         runtime->hw.rate_max = fp->rate_max;
731                 if (runtime->hw.channels_min > fp->channels)
732                         runtime->hw.channels_min = fp->channels;
733                 if (runtime->hw.channels_max < fp->channels)
734                         runtime->hw.channels_max = fp->channels;
735                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
736                         /* FIXME: there might be more than one audio formats... */
737                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
738                                 fp->frame_size;
739                 }
740                 pt = 125 * (1 << fp->datainterval);
741                 ptmin = min(ptmin, pt);
742         }
743         err = snd_usb_autoresume(subs->stream->chip);
744         if (err < 0)
745                 return err;
746
747         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
748         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
749                 /* full speed devices have fixed data packet interval */
750                 ptmin = 1000;
751         if (ptmin == 1000)
752                 /* if period time doesn't go below 1 ms, no rules needed */
753                 param_period_time_if_needed = -1;
754         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
755                                      ptmin, UINT_MAX);
756
757         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
758                                        hw_rule_rate, subs,
759                                        SNDRV_PCM_HW_PARAM_FORMAT,
760                                        SNDRV_PCM_HW_PARAM_CHANNELS,
761                                        param_period_time_if_needed,
762                                        -1)) < 0)
763                 goto rep_err;
764         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
765                                        hw_rule_channels, subs,
766                                        SNDRV_PCM_HW_PARAM_FORMAT,
767                                        SNDRV_PCM_HW_PARAM_RATE,
768                                        param_period_time_if_needed,
769                                        -1)) < 0)
770                 goto rep_err;
771         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
772                                        hw_rule_format, subs,
773                                        SNDRV_PCM_HW_PARAM_RATE,
774                                        SNDRV_PCM_HW_PARAM_CHANNELS,
775                                        param_period_time_if_needed,
776                                        -1)) < 0)
777                 goto rep_err;
778         if (param_period_time_if_needed >= 0) {
779                 err = snd_pcm_hw_rule_add(runtime, 0,
780                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
781                                           hw_rule_period_time, subs,
782                                           SNDRV_PCM_HW_PARAM_FORMAT,
783                                           SNDRV_PCM_HW_PARAM_CHANNELS,
784                                           SNDRV_PCM_HW_PARAM_RATE,
785                                           -1);
786                 if (err < 0)
787                         goto rep_err;
788         }
789         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
790                 goto rep_err;
791         return 0;
792
793 rep_err:
794         snd_usb_autosuspend(subs->stream->chip);
795         return err;
796 }
797
798 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
799 {
800         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
801         struct snd_pcm_runtime *runtime = substream->runtime;
802         struct snd_usb_substream *subs = &as->substream[direction];
803
804         subs->interface = -1;
805         subs->altset_idx = 0;
806         runtime->hw = snd_usb_hardware;
807         runtime->private_data = subs;
808         subs->pcm_substream = substream;
809         /* runtime PM is also done there */
810         return setup_hw_info(runtime, subs);
811 }
812
813 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
814 {
815         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
816         struct snd_usb_substream *subs = &as->substream[direction];
817
818         if (!as->chip->shutdown && subs->interface >= 0) {
819                 usb_set_interface(subs->dev, subs->interface, 0);
820                 subs->interface = -1;
821         }
822         subs->pcm_substream = NULL;
823         snd_usb_autosuspend(subs->stream->chip);
824         return 0;
825 }
826
827 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
828 {
829         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
830 }
831
832 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
833 {
834         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
835 }
836
837 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
838 {
839         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
840 }
841
842 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
843 {
844         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
845 }
846
847 static struct snd_pcm_ops snd_usb_playback_ops = {
848         .open =         snd_usb_playback_open,
849         .close =        snd_usb_playback_close,
850         .ioctl =        snd_pcm_lib_ioctl,
851         .hw_params =    snd_usb_hw_params,
852         .hw_free =      snd_usb_hw_free,
853         .prepare =      snd_usb_pcm_prepare,
854         .trigger =      snd_usb_substream_playback_trigger,
855         .pointer =      snd_usb_pcm_pointer,
856         .page =         snd_pcm_lib_get_vmalloc_page,
857         .mmap =         snd_pcm_lib_mmap_vmalloc,
858 };
859
860 static struct snd_pcm_ops snd_usb_capture_ops = {
861         .open =         snd_usb_capture_open,
862         .close =        snd_usb_capture_close,
863         .ioctl =        snd_pcm_lib_ioctl,
864         .hw_params =    snd_usb_hw_params,
865         .hw_free =      snd_usb_hw_free,
866         .prepare =      snd_usb_pcm_prepare,
867         .trigger =      snd_usb_substream_capture_trigger,
868         .pointer =      snd_usb_pcm_pointer,
869         .page =         snd_pcm_lib_get_vmalloc_page,
870         .mmap =         snd_pcm_lib_mmap_vmalloc,
871 };
872
873 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
874 {
875         snd_pcm_set_ops(pcm, stream,
876                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
877                         &snd_usb_playback_ops : &snd_usb_capture_ops);
878 }