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.
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.
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
17 #include <linux/init.h>
18 #include <linux/usb.h>
19 #include <linux/usb/audio.h>
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
34 * return the current pcm pointer. just based on the hwptr_done value.
36 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
38 struct snd_usb_substream *subs;
39 unsigned int hwptr_done;
41 subs = (struct snd_usb_substream *)substream->runtime->private_data;
42 spin_lock(&subs->lock);
43 hwptr_done = subs->hwptr_done;
44 spin_unlock(&subs->lock);
45 return hwptr_done / (substream->runtime->frame_bits >> 3);
49 * find a matching audio format
51 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
52 unsigned int rate, unsigned int channels)
55 struct audioformat *found = NULL;
56 int cur_attr = 0, attr;
58 list_for_each(p, &subs->fmt_list) {
59 struct audioformat *fp;
60 fp = list_entry(p, struct audioformat, list);
61 if (fp->format != format || fp->channels != channels)
63 if (rate < fp->rate_min || rate > fp->rate_max)
65 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
67 for (i = 0; i < fp->nr_rates; i++)
68 if (fp->rate_table[i] == rate)
70 if (i >= fp->nr_rates)
73 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
79 /* avoid async out and adaptive in if the other method
80 * supports the same format.
81 * this is a workaround for the case like
82 * M-audio audiophile USB.
84 if (attr != cur_attr) {
85 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
86 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
87 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
88 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
90 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
91 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
92 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
93 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
99 /* find the format with the largest max. packet size */
100 if (fp->maxpacksize > found->maxpacksize) {
110 * initialize the picth control and sample rate
112 int snd_usb_init_pitch(struct usb_device *dev, int iface,
113 struct usb_host_interface *alts,
114 struct audioformat *fmt)
117 unsigned char data[1];
120 ep = get_endpoint(alts, 0)->bEndpointAddress;
121 /* if endpoint has pitch control, enable it */
122 if (fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL) {
124 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
125 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
126 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, data, 1, 1000)) < 0) {
127 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
128 dev->devnum, iface, ep);
135 int snd_usb_init_sample_rate(struct usb_device *dev, int iface,
136 struct usb_host_interface *alts,
137 struct audioformat *fmt, int rate)
140 unsigned char data[3];
143 ep = get_endpoint(alts, 0)->bEndpointAddress;
144 /* if endpoint has sampling rate control, set it */
145 if (fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE) {
149 data[2] = rate >> 16;
150 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
151 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
152 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000)) < 0) {
153 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
154 dev->devnum, iface, fmt->altsetting, rate, ep);
157 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
158 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
159 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000)) < 0) {
160 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
161 dev->devnum, iface, fmt->altsetting, ep);
162 return 0; /* some devices don't support reading */
164 crate = data[0] | (data[1] << 8) | (data[2] << 16);
166 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
167 // runtime->rate = crate;
174 * find a matching format and set up the interface
176 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
178 struct usb_device *dev = subs->dev;
179 struct usb_host_interface *alts;
180 struct usb_interface_descriptor *altsd;
181 struct usb_interface *iface;
182 unsigned int ep, attr;
183 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
186 iface = usb_ifnum_to_if(dev, fmt->iface);
189 alts = &iface->altsetting[fmt->altset_idx];
190 altsd = get_iface_desc(alts);
191 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
194 if (fmt == subs->cur_audiofmt)
197 /* close the old interface */
198 if (subs->interface >= 0 && subs->interface != fmt->iface) {
199 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
200 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
201 dev->devnum, fmt->iface, fmt->altsetting);
204 subs->interface = -1;
209 if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
210 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
211 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
212 dev->devnum, fmt->iface, fmt->altsetting);
215 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
216 subs->interface = fmt->iface;
217 subs->format = fmt->altset_idx;
220 /* create a data pipe */
221 ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
223 subs->datapipe = usb_sndisocpipe(dev, ep);
225 subs->datapipe = usb_rcvisocpipe(dev, ep);
226 subs->datainterval = fmt->datainterval;
227 subs->syncpipe = subs->syncinterval = 0;
228 subs->maxpacksize = fmt->maxpacksize;
231 /* we need a sync pipe in async OUT or adaptive IN mode */
232 /* check the number of EP, since some devices have broken
233 * descriptors which fool us. if it has only one EP,
234 * assume it as adaptive-out or sync-in.
236 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
237 if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
238 (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
239 altsd->bNumEndpoints >= 2) {
240 /* check sync-pipe endpoint */
241 /* ... and check descriptor size before accessing bSynchAddress
242 because there is a version of the SB Audigy 2 NX firmware lacking
243 the audio fields in the endpoint descriptors */
244 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
245 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
246 get_endpoint(alts, 1)->bSynchAddress != 0)) {
247 snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
248 dev->devnum, fmt->iface, fmt->altsetting);
251 ep = get_endpoint(alts, 1)->bEndpointAddress;
252 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
253 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
254 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
255 snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
256 dev->devnum, fmt->iface, fmt->altsetting);
259 ep &= USB_ENDPOINT_NUMBER_MASK;
261 subs->syncpipe = usb_rcvisocpipe(dev, ep);
263 subs->syncpipe = usb_sndisocpipe(dev, ep);
264 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
265 get_endpoint(alts, 1)->bRefresh >= 1 &&
266 get_endpoint(alts, 1)->bRefresh <= 9)
267 subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
268 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
269 subs->syncinterval = 1;
270 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
271 get_endpoint(alts, 1)->bInterval <= 16)
272 subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
274 subs->syncinterval = 3;
277 /* always fill max packet size */
278 if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
281 if ((err = snd_usb_init_pitch(dev, subs->interface, alts, fmt)) < 0)
284 subs->cur_audiofmt = fmt;
286 snd_usb_set_format_quirk(subs, fmt);
290 "setting done: format = %d, rate = %d..%d, channels = %d\n",
291 fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
293 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
294 subs->datapipe, subs->syncpipe);
303 * allocate a buffer and set the given audio format.
305 * so far we use a physically linear buffer although packetize transfer
306 * doesn't need a continuous area.
307 * if sg buffer is supported on the later version of alsa, we'll follow
310 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
311 struct snd_pcm_hw_params *hw_params)
313 struct snd_usb_substream *subs = substream->runtime->private_data;
314 struct audioformat *fmt;
315 unsigned int channels, rate, format;
318 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
319 params_buffer_bytes(hw_params));
323 format = params_format(hw_params);
324 rate = params_rate(hw_params);
325 channels = params_channels(hw_params);
326 fmt = find_format(subs, format, rate, channels);
328 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
329 format, rate, channels);
333 changed = subs->cur_audiofmt != fmt ||
334 subs->period_bytes != params_period_bytes(hw_params) ||
335 subs->cur_rate != rate;
336 if ((ret = set_format(subs, fmt)) < 0)
339 if (subs->cur_rate != rate) {
340 struct usb_host_interface *alts;
341 struct usb_interface *iface;
342 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
343 alts = &iface->altsetting[fmt->altset_idx];
344 ret = snd_usb_init_sample_rate(subs->dev, subs->interface, alts, fmt, rate);
347 subs->cur_rate = rate;
352 snd_usb_release_substream_urbs(subs, 0);
353 /* influenced: period_bytes, channels, rate, format, */
354 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
355 params_rate(hw_params),
356 snd_pcm_format_physical_width(params_format(hw_params)) *
357 params_channels(hw_params));
366 * reset the audio format and release the buffer
368 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
370 struct snd_usb_substream *subs = substream->runtime->private_data;
372 subs->cur_audiofmt = NULL;
374 subs->period_bytes = 0;
375 if (!subs->stream->chip->shutdown)
376 snd_usb_release_substream_urbs(subs, 0);
377 return snd_pcm_lib_free_vmalloc_buffer(substream);
383 * only a few subtle things...
385 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
387 struct snd_pcm_runtime *runtime = substream->runtime;
388 struct snd_usb_substream *subs = runtime->private_data;
390 if (! subs->cur_audiofmt) {
391 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
395 /* some unit conversions in runtime */
396 subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
397 subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
399 /* reset the pointer */
400 subs->hwptr_done = 0;
401 subs->transfer_done = 0;
405 return snd_usb_substream_prepare(subs, runtime);
408 static struct snd_pcm_hardware snd_usb_hardware =
410 .info = SNDRV_PCM_INFO_MMAP |
411 SNDRV_PCM_INFO_MMAP_VALID |
412 SNDRV_PCM_INFO_BATCH |
413 SNDRV_PCM_INFO_INTERLEAVED |
414 SNDRV_PCM_INFO_BLOCK_TRANSFER |
415 SNDRV_PCM_INFO_PAUSE,
416 .buffer_bytes_max = 1024 * 1024,
417 .period_bytes_min = 64,
418 .period_bytes_max = 512 * 1024,
423 static int hw_check_valid_format(struct snd_usb_substream *subs,
424 struct snd_pcm_hw_params *params,
425 struct audioformat *fp)
427 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
428 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
429 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
430 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
433 /* check the format */
434 if (!snd_mask_test(fmts, fp->format)) {
435 hwc_debug(" > check: no supported format %d\n", fp->format);
438 /* check the channels */
439 if (fp->channels < ct->min || fp->channels > ct->max) {
440 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
443 /* check the rate is within the range */
444 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
445 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
448 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
449 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
452 /* check whether the period time is >= the data packet interval */
453 if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
454 ptime = 125 * (1 << fp->datainterval);
455 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
456 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
463 static int hw_rule_rate(struct snd_pcm_hw_params *params,
464 struct snd_pcm_hw_rule *rule)
466 struct snd_usb_substream *subs = rule->private;
468 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
469 unsigned int rmin, rmax;
472 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
475 list_for_each(p, &subs->fmt_list) {
476 struct audioformat *fp;
477 fp = list_entry(p, struct audioformat, list);
478 if (!hw_check_valid_format(subs, params, fp))
481 if (rmin > fp->rate_min)
483 if (rmax < fp->rate_max)
492 hwc_debug(" --> get empty\n");
498 if (it->min < rmin) {
503 if (it->max > rmax) {
508 if (snd_interval_checkempty(it)) {
512 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
517 static int hw_rule_channels(struct snd_pcm_hw_params *params,
518 struct snd_pcm_hw_rule *rule)
520 struct snd_usb_substream *subs = rule->private;
522 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
523 unsigned int rmin, rmax;
526 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
529 list_for_each(p, &subs->fmt_list) {
530 struct audioformat *fp;
531 fp = list_entry(p, struct audioformat, list);
532 if (!hw_check_valid_format(subs, params, fp))
535 if (rmin > fp->channels)
537 if (rmax < fp->channels)
546 hwc_debug(" --> get empty\n");
552 if (it->min < rmin) {
557 if (it->max > rmax) {
562 if (snd_interval_checkempty(it)) {
566 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
570 static int hw_rule_format(struct snd_pcm_hw_params *params,
571 struct snd_pcm_hw_rule *rule)
573 struct snd_usb_substream *subs = rule->private;
575 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
580 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
582 list_for_each(p, &subs->fmt_list) {
583 struct audioformat *fp;
584 fp = list_entry(p, struct audioformat, list);
585 if (!hw_check_valid_format(subs, params, fp))
587 fbits |= (1ULL << fp->format);
590 oldbits[0] = fmt->bits[0];
591 oldbits[1] = fmt->bits[1];
592 fmt->bits[0] &= (u32)fbits;
593 fmt->bits[1] &= (u32)(fbits >> 32);
594 if (!fmt->bits[0] && !fmt->bits[1]) {
595 hwc_debug(" --> get empty\n");
598 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
599 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
603 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
604 struct snd_pcm_hw_rule *rule)
606 struct snd_usb_substream *subs = rule->private;
607 struct audioformat *fp;
608 struct snd_interval *it;
609 unsigned char min_datainterval;
613 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
614 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
615 min_datainterval = 0xff;
616 list_for_each_entry(fp, &subs->fmt_list, list) {
617 if (!hw_check_valid_format(subs, params, fp))
619 min_datainterval = min(min_datainterval, fp->datainterval);
621 if (min_datainterval == 0xff) {
622 hwc_debug(" --> get emtpy\n");
626 pmin = 125 * (1 << min_datainterval);
628 if (it->min < pmin) {
633 if (snd_interval_checkempty(it)) {
637 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
642 * If the device supports unusual bit rates, does the request meet these?
644 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
645 struct snd_usb_substream *subs)
647 struct audioformat *fp;
648 int count = 0, needs_knot = 0;
651 list_for_each_entry(fp, &subs->fmt_list, list) {
652 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
654 count += fp->nr_rates;
655 if (fp->rates & SNDRV_PCM_RATE_KNOT)
661 subs->rate_list.count = count;
662 subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
663 subs->rate_list.mask = 0;
665 list_for_each_entry(fp, &subs->fmt_list, list) {
667 for (i = 0; i < fp->nr_rates; i++)
668 subs->rate_list.list[count++] = fp->rate_table[i];
670 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
680 * set up the runtime hardware information.
683 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
686 unsigned int pt, ptmin;
687 int param_period_time_if_needed;
690 runtime->hw.formats = subs->formats;
692 runtime->hw.rate_min = 0x7fffffff;
693 runtime->hw.rate_max = 0;
694 runtime->hw.channels_min = 256;
695 runtime->hw.channels_max = 0;
696 runtime->hw.rates = 0;
698 /* check min/max rates and channels */
699 list_for_each(p, &subs->fmt_list) {
700 struct audioformat *fp;
701 fp = list_entry(p, struct audioformat, list);
702 runtime->hw.rates |= fp->rates;
703 if (runtime->hw.rate_min > fp->rate_min)
704 runtime->hw.rate_min = fp->rate_min;
705 if (runtime->hw.rate_max < fp->rate_max)
706 runtime->hw.rate_max = fp->rate_max;
707 if (runtime->hw.channels_min > fp->channels)
708 runtime->hw.channels_min = fp->channels;
709 if (runtime->hw.channels_max < fp->channels)
710 runtime->hw.channels_max = fp->channels;
711 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
712 /* FIXME: there might be more than one audio formats... */
713 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
716 pt = 125 * (1 << fp->datainterval);
717 ptmin = min(ptmin, pt);
720 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
721 if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
722 /* full speed devices have fixed data packet interval */
725 /* if period time doesn't go below 1 ms, no rules needed */
726 param_period_time_if_needed = -1;
727 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
730 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
732 SNDRV_PCM_HW_PARAM_FORMAT,
733 SNDRV_PCM_HW_PARAM_CHANNELS,
734 param_period_time_if_needed,
737 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
738 hw_rule_channels, subs,
739 SNDRV_PCM_HW_PARAM_FORMAT,
740 SNDRV_PCM_HW_PARAM_RATE,
741 param_period_time_if_needed,
744 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
745 hw_rule_format, subs,
746 SNDRV_PCM_HW_PARAM_RATE,
747 SNDRV_PCM_HW_PARAM_CHANNELS,
748 param_period_time_if_needed,
751 if (param_period_time_if_needed >= 0) {
752 err = snd_pcm_hw_rule_add(runtime, 0,
753 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
754 hw_rule_period_time, subs,
755 SNDRV_PCM_HW_PARAM_FORMAT,
756 SNDRV_PCM_HW_PARAM_CHANNELS,
757 SNDRV_PCM_HW_PARAM_RATE,
762 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
767 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
769 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
770 struct snd_pcm_runtime *runtime = substream->runtime;
771 struct snd_usb_substream *subs = &as->substream[direction];
773 subs->interface = -1;
775 runtime->hw = snd_usb_hardware;
776 runtime->private_data = subs;
777 subs->pcm_substream = substream;
778 return setup_hw_info(runtime, subs);
781 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
783 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
784 struct snd_usb_substream *subs = &as->substream[direction];
786 if (!as->chip->shutdown && subs->interface >= 0) {
787 usb_set_interface(subs->dev, subs->interface, 0);
788 subs->interface = -1;
790 subs->pcm_substream = NULL;
794 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
796 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
799 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
801 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
804 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
806 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
809 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
811 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
814 static struct snd_pcm_ops snd_usb_playback_ops = {
815 .open = snd_usb_playback_open,
816 .close = snd_usb_playback_close,
817 .ioctl = snd_pcm_lib_ioctl,
818 .hw_params = snd_usb_hw_params,
819 .hw_free = snd_usb_hw_free,
820 .prepare = snd_usb_pcm_prepare,
821 .trigger = snd_usb_substream_playback_trigger,
822 .pointer = snd_usb_pcm_pointer,
823 .page = snd_pcm_lib_get_vmalloc_page,
824 .mmap = snd_pcm_lib_mmap_vmalloc,
827 static struct snd_pcm_ops snd_usb_capture_ops = {
828 .open = snd_usb_capture_open,
829 .close = snd_usb_capture_close,
830 .ioctl = snd_pcm_lib_ioctl,
831 .hw_params = snd_usb_hw_params,
832 .hw_free = snd_usb_hw_free,
833 .prepare = snd_usb_pcm_prepare,
834 .trigger = snd_usb_substream_capture_trigger,
835 .pointer = snd_usb_pcm_pointer,
836 .page = snd_pcm_lib_get_vmalloc_page,
837 .mmap = snd_pcm_lib_mmap_vmalloc,
840 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
842 snd_pcm_set_ops(pcm, stream,
843 stream == SNDRV_PCM_STREAM_PLAYBACK ?
844 &snd_usb_playback_ops : &snd_usb_capture_ops);