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/slab.h>
19 #include <linux/ratelimit.h>
20 #include <linux/usb.h>
21 #include <linux/usb/audio.h>
22 #include <linux/usb/audio-v2.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
38 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
39 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
41 /* return the estimated delay based on USB frame counters */
42 snd_pcm_uframes_t
snd_usb_pcm_delay(struct snd_usb_substream
*subs
,
45 int current_frame_number
;
49 if (!subs
->last_delay
)
50 return 0; /* short path */
52 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
54 * HCD implementations use different widths, use lower 8 bits.
55 * The delay will be managed up to 256ms, which is more than
58 frame_diff
= (current_frame_number
- subs
->last_frame_number
) & 0xff;
60 /* Approximation based on number of samples per USB frame (ms),
61 some truncation for 44.1 but the estimate is good enough */
62 est_delay
= frame_diff
* rate
/ 1000;
63 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
64 est_delay
= subs
->last_delay
- est_delay
;
66 est_delay
= subs
->last_delay
+ est_delay
;
74 * return the current pcm pointer. just based on the hwptr_done value.
76 static snd_pcm_uframes_t
snd_usb_pcm_pointer(struct snd_pcm_substream
*substream
)
78 struct snd_usb_substream
*subs
;
79 unsigned int hwptr_done
;
81 subs
= (struct snd_usb_substream
*)substream
->runtime
->private_data
;
82 if (subs
->stream
->chip
->shutdown
)
83 return SNDRV_PCM_POS_XRUN
;
84 spin_lock(&subs
->lock
);
85 hwptr_done
= subs
->hwptr_done
;
86 substream
->runtime
->delay
= snd_usb_pcm_delay(subs
,
87 substream
->runtime
->rate
);
88 spin_unlock(&subs
->lock
);
89 return hwptr_done
/ (substream
->runtime
->frame_bits
>> 3);
93 * find a matching audio format
95 static struct audioformat
*find_format(struct snd_usb_substream
*subs
)
98 struct audioformat
*found
= NULL
;
99 int cur_attr
= 0, attr
;
101 list_for_each(p
, &subs
->fmt_list
) {
102 struct audioformat
*fp
;
103 fp
= list_entry(p
, struct audioformat
, list
);
104 if (!(fp
->formats
& (1uLL << subs
->pcm_format
)))
106 if (fp
->channels
!= subs
->channels
)
108 if (subs
->cur_rate
< fp
->rate_min
||
109 subs
->cur_rate
> fp
->rate_max
)
111 if (! (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)) {
113 for (i
= 0; i
< fp
->nr_rates
; i
++)
114 if (fp
->rate_table
[i
] == subs
->cur_rate
)
116 if (i
>= fp
->nr_rates
)
119 attr
= fp
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
125 /* avoid async out and adaptive in if the other method
126 * supports the same format.
127 * this is a workaround for the case like
128 * M-audio audiophile USB.
130 if (attr
!= cur_attr
) {
131 if ((attr
== USB_ENDPOINT_SYNC_ASYNC
&&
132 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
133 (attr
== USB_ENDPOINT_SYNC_ADAPTIVE
&&
134 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
))
136 if ((cur_attr
== USB_ENDPOINT_SYNC_ASYNC
&&
137 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
138 (cur_attr
== USB_ENDPOINT_SYNC_ADAPTIVE
&&
139 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
)) {
145 /* find the format with the largest max. packet size */
146 if (fp
->maxpacksize
> found
->maxpacksize
) {
154 static int init_pitch_v1(struct snd_usb_audio
*chip
, int iface
,
155 struct usb_host_interface
*alts
,
156 struct audioformat
*fmt
)
158 struct usb_device
*dev
= chip
->dev
;
160 unsigned char data
[1];
163 ep
= get_endpoint(alts
, 0)->bEndpointAddress
;
166 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC_SET_CUR
,
167 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_OUT
,
168 UAC_EP_CS_ATTR_PITCH_CONTROL
<< 8, ep
,
169 data
, sizeof(data
))) < 0) {
170 snd_printk(KERN_ERR
"%d:%d:%d: cannot set enable PITCH\n",
171 dev
->devnum
, iface
, ep
);
178 static int init_pitch_v2(struct snd_usb_audio
*chip
, int iface
,
179 struct usb_host_interface
*alts
,
180 struct audioformat
*fmt
)
182 struct usb_device
*dev
= chip
->dev
;
183 unsigned char data
[1];
187 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC2_CS_CUR
,
188 USB_TYPE_CLASS
| USB_RECIP_ENDPOINT
| USB_DIR_OUT
,
189 UAC2_EP_CS_PITCH
<< 8, 0,
190 data
, sizeof(data
))) < 0) {
191 snd_printk(KERN_ERR
"%d:%d:%d: cannot set enable PITCH (v2)\n",
192 dev
->devnum
, iface
, fmt
->altsetting
);
200 * initialize the pitch control and sample rate
202 int snd_usb_init_pitch(struct snd_usb_audio
*chip
, int iface
,
203 struct usb_host_interface
*alts
,
204 struct audioformat
*fmt
)
206 struct usb_interface_descriptor
*altsd
= get_iface_desc(alts
);
208 /* if endpoint doesn't have pitch control, bail out */
209 if (!(fmt
->attributes
& UAC_EP_CS_ATTR_PITCH_CONTROL
))
212 switch (altsd
->bInterfaceProtocol
) {
215 return init_pitch_v1(chip
, iface
, alts
, fmt
);
218 return init_pitch_v2(chip
, iface
, alts
, fmt
);
222 static int start_endpoints(struct snd_usb_substream
*subs
, bool can_sleep
)
226 if (!subs
->data_endpoint
)
229 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
)) {
230 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
232 snd_printdd(KERN_DEBUG
"Starting data EP @%p\n", ep
);
234 ep
->data_subs
= subs
;
235 err
= snd_usb_endpoint_start(ep
, can_sleep
);
237 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
);
242 if (subs
->sync_endpoint
&&
243 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
)) {
244 struct snd_usb_endpoint
*ep
= subs
->sync_endpoint
;
246 if (subs
->data_endpoint
->iface
!= subs
->sync_endpoint
->iface
||
247 subs
->data_endpoint
->alt_idx
!= subs
->sync_endpoint
->alt_idx
) {
248 err
= usb_set_interface(subs
->dev
,
249 subs
->sync_endpoint
->iface
,
250 subs
->sync_endpoint
->alt_idx
);
253 "%d:%d:%d: cannot set interface (%d)\n",
255 subs
->sync_endpoint
->iface
,
256 subs
->sync_endpoint
->alt_idx
, err
);
261 snd_printdd(KERN_DEBUG
"Starting sync EP @%p\n", ep
);
263 ep
->sync_slave
= subs
->data_endpoint
;
264 err
= snd_usb_endpoint_start(ep
, can_sleep
);
266 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
);
274 static void stop_endpoints(struct snd_usb_substream
*subs
, bool wait
)
276 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
))
277 snd_usb_endpoint_stop(subs
->sync_endpoint
);
279 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
))
280 snd_usb_endpoint_stop(subs
->data_endpoint
);
283 snd_usb_endpoint_sync_pending_stop(subs
->sync_endpoint
);
284 snd_usb_endpoint_sync_pending_stop(subs
->data_endpoint
);
288 static int deactivate_endpoints(struct snd_usb_substream
*subs
)
292 reta
= snd_usb_endpoint_deactivate(subs
->sync_endpoint
);
293 retb
= snd_usb_endpoint_deactivate(subs
->data_endpoint
);
305 * find a matching format and set up the interface
307 static int set_format(struct snd_usb_substream
*subs
, struct audioformat
*fmt
)
309 struct usb_device
*dev
= subs
->dev
;
310 struct usb_host_interface
*alts
;
311 struct usb_interface_descriptor
*altsd
;
312 struct usb_interface
*iface
;
313 unsigned int ep
, attr
;
314 int is_playback
= subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
;
315 int err
, implicit_fb
= 0;
317 iface
= usb_ifnum_to_if(dev
, fmt
->iface
);
320 alts
= &iface
->altsetting
[fmt
->altset_idx
];
321 altsd
= get_iface_desc(alts
);
322 if (WARN_ON(altsd
->bAlternateSetting
!= fmt
->altsetting
))
325 if (fmt
== subs
->cur_audiofmt
)
328 /* close the old interface */
329 if (subs
->interface
>= 0 && subs
->interface
!= fmt
->iface
) {
330 err
= usb_set_interface(subs
->dev
, subs
->interface
, 0);
332 snd_printk(KERN_ERR
"%d:%d:%d: return to setting 0 failed (%d)\n",
333 dev
->devnum
, fmt
->iface
, fmt
->altsetting
, err
);
336 subs
->interface
= -1;
337 subs
->altset_idx
= 0;
341 if (subs
->interface
!= fmt
->iface
||
342 subs
->altset_idx
!= fmt
->altset_idx
) {
343 err
= usb_set_interface(dev
, fmt
->iface
, fmt
->altsetting
);
345 snd_printk(KERN_ERR
"%d:%d:%d: usb_set_interface failed (%d)\n",
346 dev
->devnum
, fmt
->iface
, fmt
->altsetting
, err
);
349 snd_printdd(KERN_INFO
"setting usb interface %d:%d\n",
350 fmt
->iface
, fmt
->altsetting
);
351 subs
->interface
= fmt
->iface
;
352 subs
->altset_idx
= fmt
->altset_idx
;
355 subs
->data_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
356 alts
, fmt
->endpoint
, subs
->direction
,
357 SND_USB_ENDPOINT_TYPE_DATA
);
358 if (!subs
->data_endpoint
)
361 /* we need a sync pipe in async OUT or adaptive IN mode */
362 /* check the number of EP, since some devices have broken
363 * descriptors which fool us. if it has only one EP,
364 * assume it as adaptive-out or sync-in.
366 attr
= fmt
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
368 switch (subs
->stream
->chip
->usb_id
) {
369 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
370 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
374 iface
= usb_ifnum_to_if(dev
, 3);
376 if (!iface
|| iface
->num_altsetting
== 0)
379 alts
= &iface
->altsetting
[1];
383 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
384 case USB_ID(0x0763, 0x2081):
388 iface
= usb_ifnum_to_if(dev
, 2);
390 if (!iface
|| iface
->num_altsetting
== 0)
393 alts
= &iface
->altsetting
[1];
398 if (((is_playback
&& attr
== USB_ENDPOINT_SYNC_ASYNC
) ||
399 (!is_playback
&& attr
== USB_ENDPOINT_SYNC_ADAPTIVE
)) &&
400 altsd
->bNumEndpoints
>= 2) {
401 /* check sync-pipe endpoint */
402 /* ... and check descriptor size before accessing bSynchAddress
403 because there is a version of the SB Audigy 2 NX firmware lacking
404 the audio fields in the endpoint descriptors */
405 if ((get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) != USB_ENDPOINT_XFER_ISOC
||
406 (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
407 get_endpoint(alts
, 1)->bSynchAddress
!= 0 &&
409 snd_printk(KERN_ERR
"%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
410 dev
->devnum
, fmt
->iface
, fmt
->altsetting
,
411 get_endpoint(alts
, 1)->bmAttributes
,
412 get_endpoint(alts
, 1)->bLength
,
413 get_endpoint(alts
, 1)->bSynchAddress
);
416 ep
= get_endpoint(alts
, 1)->bEndpointAddress
;
418 get_endpoint(alts
, 0)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
419 (( is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
| USB_DIR_IN
)) ||
420 (!is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
& ~USB_DIR_IN
)))) {
421 snd_printk(KERN_ERR
"%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
422 dev
->devnum
, fmt
->iface
, fmt
->altsetting
,
423 is_playback
, ep
, get_endpoint(alts
, 0)->bSynchAddress
);
427 implicit_fb
= (get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_USAGE_MASK
)
428 == USB_ENDPOINT_USAGE_IMPLICIT_FB
;
431 subs
->sync_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
432 alts
, ep
, !subs
->direction
,
434 SND_USB_ENDPOINT_TYPE_DATA
:
435 SND_USB_ENDPOINT_TYPE_SYNC
);
436 if (!subs
->sync_endpoint
)
439 subs
->data_endpoint
->sync_master
= subs
->sync_endpoint
;
442 if ((err
= snd_usb_init_pitch(subs
->stream
->chip
, fmt
->iface
, alts
, fmt
)) < 0)
445 subs
->cur_audiofmt
= fmt
;
447 snd_usb_set_format_quirk(subs
, fmt
);
451 "setting done: format = %d, rate = %d..%d, channels = %d\n",
452 fmt
->format
, fmt
->rate_min
, fmt
->rate_max
, fmt
->channels
);
454 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
455 subs
->datapipe
, subs
->syncpipe
);
462 * Return the score of matching two audioformats.
463 * Veto the audioformat if:
464 * - It has no channels for some reason.
465 * - Requested PCM format is not supported.
466 * - Requested sample rate is not supported.
468 static int match_endpoint_audioformats(struct audioformat
*fp
,
469 struct audioformat
*match
, int rate
,
470 snd_pcm_format_t pcm_format
)
475 if (fp
->channels
< 1) {
476 snd_printdd("%s: (fmt @%p) no channels\n", __func__
, fp
);
480 if (!(fp
->formats
& (1ULL << pcm_format
))) {
481 snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__
,
486 for (i
= 0; i
< fp
->nr_rates
; i
++) {
487 if (fp
->rate_table
[i
] == rate
) {
493 snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__
,
498 if (fp
->channels
== match
->channels
)
501 snd_printdd("%s: (fmt @%p) score %d\n", __func__
, fp
, score
);
507 * Configure the sync ep using the rate and pcm format of the data ep.
509 static int configure_sync_endpoint(struct snd_usb_substream
*subs
)
512 struct audioformat
*fp
;
513 struct audioformat
*sync_fp
= NULL
;
515 int sync_period_bytes
= subs
->period_bytes
;
516 struct snd_usb_substream
*sync_subs
=
517 &subs
->stream
->substream
[subs
->direction
^ 1];
519 if (subs
->sync_endpoint
->type
!= SND_USB_ENDPOINT_TYPE_DATA
||
521 return snd_usb_endpoint_set_params(subs
->sync_endpoint
,
529 /* Try to find the best matching audioformat. */
530 list_for_each_entry(fp
, &sync_subs
->fmt_list
, list
) {
531 int score
= match_endpoint_audioformats(fp
, subs
->cur_audiofmt
,
532 subs
->cur_rate
, subs
->pcm_format
);
534 if (score
> cur_score
) {
540 if (unlikely(sync_fp
== NULL
)) {
541 snd_printk(KERN_ERR
"%s: no valid audioformat for sync ep %x found\n",
542 __func__
, sync_subs
->ep_num
);
547 * Recalculate the period bytes if channel number differ between
548 * data and sync ep audioformat.
550 if (sync_fp
->channels
!= subs
->channels
) {
551 sync_period_bytes
= (subs
->period_bytes
/ subs
->channels
) *
553 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
554 __func__
, subs
->period_bytes
, sync_period_bytes
);
557 ret
= snd_usb_endpoint_set_params(subs
->sync_endpoint
,
569 * configure endpoint params
571 * called during initial setup and upon resume
573 static int configure_endpoint(struct snd_usb_substream
*subs
)
578 stop_endpoints(subs
, true);
579 ret
= snd_usb_endpoint_set_params(subs
->data_endpoint
,
585 subs
->sync_endpoint
);
589 if (subs
->sync_endpoint
)
590 ret
= configure_sync_endpoint(subs
);
598 * allocate a buffer and set the given audio format.
600 * so far we use a physically linear buffer although packetize transfer
601 * doesn't need a continuous area.
602 * if sg buffer is supported on the later version of alsa, we'll follow
605 static int snd_usb_hw_params(struct snd_pcm_substream
*substream
,
606 struct snd_pcm_hw_params
*hw_params
)
608 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
609 struct audioformat
*fmt
;
612 ret
= snd_pcm_lib_alloc_vmalloc_buffer(substream
,
613 params_buffer_bytes(hw_params
));
617 subs
->pcm_format
= params_format(hw_params
);
618 subs
->period_bytes
= params_period_bytes(hw_params
);
619 subs
->channels
= params_channels(hw_params
);
620 subs
->cur_rate
= params_rate(hw_params
);
622 fmt
= find_format(subs
);
624 snd_printd(KERN_DEBUG
"cannot set format: format = %#x, rate = %d, channels = %d\n",
625 subs
->pcm_format
, subs
->cur_rate
, subs
->channels
);
629 down_read(&subs
->stream
->chip
->shutdown_rwsem
);
630 if (subs
->stream
->chip
->shutdown
)
633 ret
= set_format(subs
, fmt
);
634 up_read(&subs
->stream
->chip
->shutdown_rwsem
);
638 subs
->interface
= fmt
->iface
;
639 subs
->altset_idx
= fmt
->altset_idx
;
640 subs
->need_setup_ep
= true;
648 * reset the audio format and release the buffer
650 static int snd_usb_hw_free(struct snd_pcm_substream
*substream
)
652 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
654 subs
->cur_audiofmt
= NULL
;
656 subs
->period_bytes
= 0;
657 down_read(&subs
->stream
->chip
->shutdown_rwsem
);
658 if (!subs
->stream
->chip
->shutdown
) {
659 stop_endpoints(subs
, true);
660 deactivate_endpoints(subs
);
662 up_read(&subs
->stream
->chip
->shutdown_rwsem
);
663 return snd_pcm_lib_free_vmalloc_buffer(substream
);
669 * only a few subtle things...
671 static int snd_usb_pcm_prepare(struct snd_pcm_substream
*substream
)
673 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
674 struct snd_usb_substream
*subs
= runtime
->private_data
;
675 struct usb_host_interface
*alts
;
676 struct usb_interface
*iface
;
679 if (! subs
->cur_audiofmt
) {
680 snd_printk(KERN_ERR
"usbaudio: no format is specified!\n");
684 down_read(&subs
->stream
->chip
->shutdown_rwsem
);
685 if (subs
->stream
->chip
->shutdown
) {
689 if (snd_BUG_ON(!subs
->data_endpoint
)) {
694 snd_usb_endpoint_sync_pending_stop(subs
->sync_endpoint
);
695 snd_usb_endpoint_sync_pending_stop(subs
->data_endpoint
);
697 ret
= set_format(subs
, subs
->cur_audiofmt
);
701 iface
= usb_ifnum_to_if(subs
->dev
, subs
->cur_audiofmt
->iface
);
702 alts
= &iface
->altsetting
[subs
->cur_audiofmt
->altset_idx
];
703 ret
= snd_usb_init_sample_rate(subs
->stream
->chip
,
704 subs
->cur_audiofmt
->iface
,
711 if (subs
->need_setup_ep
) {
712 ret
= configure_endpoint(subs
);
715 subs
->need_setup_ep
= false;
718 /* some unit conversions in runtime */
719 subs
->data_endpoint
->maxframesize
=
720 bytes_to_frames(runtime
, subs
->data_endpoint
->maxpacksize
);
721 subs
->data_endpoint
->curframesize
=
722 bytes_to_frames(runtime
, subs
->data_endpoint
->curpacksize
);
724 /* reset the pointer */
725 subs
->hwptr_done
= 0;
726 subs
->transfer_done
= 0;
727 subs
->last_delay
= 0;
728 subs
->last_frame_number
= 0;
731 /* for playback, submit the URBs now; otherwise, the first hwptr_done
732 * updates for all URBs would happen at the same time when starting */
733 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
734 ret
= start_endpoints(subs
, true);
737 up_read(&subs
->stream
->chip
->shutdown_rwsem
);
741 static struct snd_pcm_hardware snd_usb_hardware
=
743 .info
= SNDRV_PCM_INFO_MMAP
|
744 SNDRV_PCM_INFO_MMAP_VALID
|
745 SNDRV_PCM_INFO_BATCH
|
746 SNDRV_PCM_INFO_INTERLEAVED
|
747 SNDRV_PCM_INFO_BLOCK_TRANSFER
|
748 SNDRV_PCM_INFO_PAUSE
,
749 .buffer_bytes_max
= 1024 * 1024,
750 .period_bytes_min
= 64,
751 .period_bytes_max
= 512 * 1024,
756 static int hw_check_valid_format(struct snd_usb_substream
*subs
,
757 struct snd_pcm_hw_params
*params
,
758 struct audioformat
*fp
)
760 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
761 struct snd_interval
*ct
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
762 struct snd_mask
*fmts
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
763 struct snd_interval
*pt
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
764 struct snd_mask check_fmts
;
767 /* check the format */
768 snd_mask_none(&check_fmts
);
769 check_fmts
.bits
[0] = (u32
)fp
->formats
;
770 check_fmts
.bits
[1] = (u32
)(fp
->formats
>> 32);
771 snd_mask_intersect(&check_fmts
, fmts
);
772 if (snd_mask_empty(&check_fmts
)) {
773 hwc_debug(" > check: no supported format %d\n", fp
->format
);
776 /* check the channels */
777 if (fp
->channels
< ct
->min
|| fp
->channels
> ct
->max
) {
778 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp
->channels
, ct
->min
, ct
->max
);
781 /* check the rate is within the range */
782 if (fp
->rate_min
> it
->max
|| (fp
->rate_min
== it
->max
&& it
->openmax
)) {
783 hwc_debug(" > check: rate_min %d > max %d\n", fp
->rate_min
, it
->max
);
786 if (fp
->rate_max
< it
->min
|| (fp
->rate_max
== it
->min
&& it
->openmin
)) {
787 hwc_debug(" > check: rate_max %d < min %d\n", fp
->rate_max
, it
->min
);
790 /* check whether the period time is >= the data packet interval */
791 if (subs
->speed
!= USB_SPEED_FULL
) {
792 ptime
= 125 * (1 << fp
->datainterval
);
793 if (ptime
> pt
->max
|| (ptime
== pt
->max
&& pt
->openmax
)) {
794 hwc_debug(" > check: ptime %u > max %u\n", ptime
, pt
->max
);
801 static int hw_rule_rate(struct snd_pcm_hw_params
*params
,
802 struct snd_pcm_hw_rule
*rule
)
804 struct snd_usb_substream
*subs
= rule
->private;
806 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
807 unsigned int rmin
, rmax
;
810 hwc_debug("hw_rule_rate: (%d,%d)\n", it
->min
, it
->max
);
813 list_for_each(p
, &subs
->fmt_list
) {
814 struct audioformat
*fp
;
815 fp
= list_entry(p
, struct audioformat
, list
);
816 if (!hw_check_valid_format(subs
, params
, fp
))
819 if (rmin
> fp
->rate_min
)
821 if (rmax
< fp
->rate_max
)
830 hwc_debug(" --> get empty\n");
836 if (it
->min
< rmin
) {
841 if (it
->max
> rmax
) {
846 if (snd_interval_checkempty(it
)) {
850 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
855 static int hw_rule_channels(struct snd_pcm_hw_params
*params
,
856 struct snd_pcm_hw_rule
*rule
)
858 struct snd_usb_substream
*subs
= rule
->private;
860 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
861 unsigned int rmin
, rmax
;
864 hwc_debug("hw_rule_channels: (%d,%d)\n", it
->min
, it
->max
);
867 list_for_each(p
, &subs
->fmt_list
) {
868 struct audioformat
*fp
;
869 fp
= list_entry(p
, struct audioformat
, list
);
870 if (!hw_check_valid_format(subs
, params
, fp
))
873 if (rmin
> fp
->channels
)
875 if (rmax
< fp
->channels
)
884 hwc_debug(" --> get empty\n");
890 if (it
->min
< rmin
) {
895 if (it
->max
> rmax
) {
900 if (snd_interval_checkempty(it
)) {
904 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
908 static int hw_rule_format(struct snd_pcm_hw_params
*params
,
909 struct snd_pcm_hw_rule
*rule
)
911 struct snd_usb_substream
*subs
= rule
->private;
913 struct snd_mask
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
918 hwc_debug("hw_rule_format: %x:%x\n", fmt
->bits
[0], fmt
->bits
[1]);
920 list_for_each(p
, &subs
->fmt_list
) {
921 struct audioformat
*fp
;
922 fp
= list_entry(p
, struct audioformat
, list
);
923 if (!hw_check_valid_format(subs
, params
, fp
))
925 fbits
|= fp
->formats
;
928 oldbits
[0] = fmt
->bits
[0];
929 oldbits
[1] = fmt
->bits
[1];
930 fmt
->bits
[0] &= (u32
)fbits
;
931 fmt
->bits
[1] &= (u32
)(fbits
>> 32);
932 if (!fmt
->bits
[0] && !fmt
->bits
[1]) {
933 hwc_debug(" --> get empty\n");
936 changed
= (oldbits
[0] != fmt
->bits
[0] || oldbits
[1] != fmt
->bits
[1]);
937 hwc_debug(" --> %x:%x (changed = %d)\n", fmt
->bits
[0], fmt
->bits
[1], changed
);
941 static int hw_rule_period_time(struct snd_pcm_hw_params
*params
,
942 struct snd_pcm_hw_rule
*rule
)
944 struct snd_usb_substream
*subs
= rule
->private;
945 struct audioformat
*fp
;
946 struct snd_interval
*it
;
947 unsigned char min_datainterval
;
951 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
952 hwc_debug("hw_rule_period_time: (%u,%u)\n", it
->min
, it
->max
);
953 min_datainterval
= 0xff;
954 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
955 if (!hw_check_valid_format(subs
, params
, fp
))
957 min_datainterval
= min(min_datainterval
, fp
->datainterval
);
959 if (min_datainterval
== 0xff) {
960 hwc_debug(" --> get empty\n");
964 pmin
= 125 * (1 << min_datainterval
);
966 if (it
->min
< pmin
) {
971 if (snd_interval_checkempty(it
)) {
975 hwc_debug(" --> (%u,%u) (changed = %d)\n", it
->min
, it
->max
, changed
);
980 * If the device supports unusual bit rates, does the request meet these?
982 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime
*runtime
,
983 struct snd_usb_substream
*subs
)
985 struct audioformat
*fp
;
987 int count
= 0, needs_knot
= 0;
990 kfree(subs
->rate_list
.list
);
991 subs
->rate_list
.list
= NULL
;
993 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
994 if (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)
996 count
+= fp
->nr_rates
;
997 if (fp
->rates
& SNDRV_PCM_RATE_KNOT
)
1003 subs
->rate_list
.list
= rate_list
=
1004 kmalloc(sizeof(int) * count
, GFP_KERNEL
);
1005 if (!subs
->rate_list
.list
)
1007 subs
->rate_list
.count
= count
;
1008 subs
->rate_list
.mask
= 0;
1010 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1012 for (i
= 0; i
< fp
->nr_rates
; i
++)
1013 rate_list
[count
++] = fp
->rate_table
[i
];
1015 err
= snd_pcm_hw_constraint_list(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1025 * set up the runtime hardware information.
1028 static int setup_hw_info(struct snd_pcm_runtime
*runtime
, struct snd_usb_substream
*subs
)
1030 struct list_head
*p
;
1031 unsigned int pt
, ptmin
;
1032 int param_period_time_if_needed
;
1035 runtime
->hw
.formats
= subs
->formats
;
1037 runtime
->hw
.rate_min
= 0x7fffffff;
1038 runtime
->hw
.rate_max
= 0;
1039 runtime
->hw
.channels_min
= 256;
1040 runtime
->hw
.channels_max
= 0;
1041 runtime
->hw
.rates
= 0;
1043 /* check min/max rates and channels */
1044 list_for_each(p
, &subs
->fmt_list
) {
1045 struct audioformat
*fp
;
1046 fp
= list_entry(p
, struct audioformat
, list
);
1047 runtime
->hw
.rates
|= fp
->rates
;
1048 if (runtime
->hw
.rate_min
> fp
->rate_min
)
1049 runtime
->hw
.rate_min
= fp
->rate_min
;
1050 if (runtime
->hw
.rate_max
< fp
->rate_max
)
1051 runtime
->hw
.rate_max
= fp
->rate_max
;
1052 if (runtime
->hw
.channels_min
> fp
->channels
)
1053 runtime
->hw
.channels_min
= fp
->channels
;
1054 if (runtime
->hw
.channels_max
< fp
->channels
)
1055 runtime
->hw
.channels_max
= fp
->channels
;
1056 if (fp
->fmt_type
== UAC_FORMAT_TYPE_II
&& fp
->frame_size
> 0) {
1057 /* FIXME: there might be more than one audio formats... */
1058 runtime
->hw
.period_bytes_min
= runtime
->hw
.period_bytes_max
=
1061 pt
= 125 * (1 << fp
->datainterval
);
1062 ptmin
= min(ptmin
, pt
);
1064 err
= snd_usb_autoresume(subs
->stream
->chip
);
1068 param_period_time_if_needed
= SNDRV_PCM_HW_PARAM_PERIOD_TIME
;
1069 if (subs
->speed
== USB_SPEED_FULL
)
1070 /* full speed devices have fixed data packet interval */
1073 /* if period time doesn't go below 1 ms, no rules needed */
1074 param_period_time_if_needed
= -1;
1075 snd_pcm_hw_constraint_minmax(runtime
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1078 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1080 SNDRV_PCM_HW_PARAM_FORMAT
,
1081 SNDRV_PCM_HW_PARAM_CHANNELS
,
1082 param_period_time_if_needed
,
1085 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
1086 hw_rule_channels
, subs
,
1087 SNDRV_PCM_HW_PARAM_FORMAT
,
1088 SNDRV_PCM_HW_PARAM_RATE
,
1089 param_period_time_if_needed
,
1092 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
1093 hw_rule_format
, subs
,
1094 SNDRV_PCM_HW_PARAM_RATE
,
1095 SNDRV_PCM_HW_PARAM_CHANNELS
,
1096 param_period_time_if_needed
,
1099 if (param_period_time_if_needed
>= 0) {
1100 err
= snd_pcm_hw_rule_add(runtime
, 0,
1101 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1102 hw_rule_period_time
, subs
,
1103 SNDRV_PCM_HW_PARAM_FORMAT
,
1104 SNDRV_PCM_HW_PARAM_CHANNELS
,
1105 SNDRV_PCM_HW_PARAM_RATE
,
1110 if ((err
= snd_usb_pcm_check_knot(runtime
, subs
)) < 0)
1115 snd_usb_autosuspend(subs
->stream
->chip
);
1119 static int snd_usb_pcm_open(struct snd_pcm_substream
*substream
, int direction
)
1121 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1122 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1123 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1125 subs
->interface
= -1;
1126 subs
->altset_idx
= 0;
1127 runtime
->hw
= snd_usb_hardware
;
1128 runtime
->private_data
= subs
;
1129 subs
->pcm_substream
= substream
;
1130 /* runtime PM is also done there */
1131 return setup_hw_info(runtime
, subs
);
1134 static int snd_usb_pcm_close(struct snd_pcm_substream
*substream
, int direction
)
1136 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1137 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1139 stop_endpoints(subs
, true);
1141 if (!as
->chip
->shutdown
&& subs
->interface
>= 0) {
1142 usb_set_interface(subs
->dev
, subs
->interface
, 0);
1143 subs
->interface
= -1;
1146 subs
->pcm_substream
= NULL
;
1147 snd_usb_autosuspend(subs
->stream
->chip
);
1152 /* Since a URB can handle only a single linear buffer, we must use double
1153 * buffering when the data to be transferred overflows the buffer boundary.
1154 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1157 static void retire_capture_urb(struct snd_usb_substream
*subs
,
1160 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1161 unsigned int stride
, frames
, bytes
, oldptr
;
1162 int i
, period_elapsed
= 0;
1163 unsigned long flags
;
1165 int current_frame_number
;
1167 /* read frame number here, update pointer in critical section */
1168 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
1170 stride
= runtime
->frame_bits
>> 3;
1172 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1173 cp
= (unsigned char *)urb
->transfer_buffer
+ urb
->iso_frame_desc
[i
].offset
;
1174 if (urb
->iso_frame_desc
[i
].status
&& printk_ratelimit()) {
1175 snd_printdd(KERN_ERR
"frame %d active: %d\n", i
, urb
->iso_frame_desc
[i
].status
);
1178 bytes
= urb
->iso_frame_desc
[i
].actual_length
;
1179 frames
= bytes
/ stride
;
1180 if (!subs
->txfr_quirk
)
1181 bytes
= frames
* stride
;
1182 if (bytes
% (runtime
->sample_bits
>> 3) != 0) {
1183 int oldbytes
= bytes
;
1184 bytes
= frames
* stride
;
1185 snd_printdd(KERN_ERR
"Corrected urb data len. %d->%d\n",
1188 /* update the current pointer */
1189 spin_lock_irqsave(&subs
->lock
, flags
);
1190 oldptr
= subs
->hwptr_done
;
1191 subs
->hwptr_done
+= bytes
;
1192 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1193 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1194 frames
= (bytes
+ (oldptr
% stride
)) / stride
;
1195 subs
->transfer_done
+= frames
;
1196 if (subs
->transfer_done
>= runtime
->period_size
) {
1197 subs
->transfer_done
-= runtime
->period_size
;
1200 /* capture delay is by construction limited to one URB,
1203 runtime
->delay
= subs
->last_delay
= 0;
1205 /* realign last_frame_number */
1206 subs
->last_frame_number
= current_frame_number
;
1207 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1209 spin_unlock_irqrestore(&subs
->lock
, flags
);
1210 /* copy a data chunk */
1211 if (oldptr
+ bytes
> runtime
->buffer_size
* stride
) {
1212 unsigned int bytes1
=
1213 runtime
->buffer_size
* stride
- oldptr
;
1214 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes1
);
1215 memcpy(runtime
->dma_area
, cp
+ bytes1
, bytes
- bytes1
);
1217 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes
);
1222 snd_pcm_period_elapsed(subs
->pcm_substream
);
1225 static void prepare_playback_urb(struct snd_usb_substream
*subs
,
1228 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1229 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1230 struct snd_urb_ctx
*ctx
= urb
->context
;
1231 unsigned int counts
, frames
, bytes
;
1232 int i
, stride
, period_elapsed
= 0;
1233 unsigned long flags
;
1235 stride
= runtime
->frame_bits
>> 3;
1238 urb
->number_of_packets
= 0;
1239 spin_lock_irqsave(&subs
->lock
, flags
);
1240 for (i
= 0; i
< ctx
->packets
; i
++) {
1241 if (ctx
->packet_size
[i
])
1242 counts
= ctx
->packet_size
[i
];
1244 counts
= snd_usb_endpoint_next_packet_size(ep
);
1246 /* set up descriptor */
1247 urb
->iso_frame_desc
[i
].offset
= frames
* stride
;
1248 urb
->iso_frame_desc
[i
].length
= counts
* stride
;
1250 urb
->number_of_packets
++;
1251 subs
->transfer_done
+= counts
;
1252 if (subs
->transfer_done
>= runtime
->period_size
) {
1253 subs
->transfer_done
-= runtime
->period_size
;
1255 if (subs
->fmt_type
== UAC_FORMAT_TYPE_II
) {
1256 if (subs
->transfer_done
> 0) {
1257 /* FIXME: fill-max mode is not
1259 frames
-= subs
->transfer_done
;
1260 counts
-= subs
->transfer_done
;
1261 urb
->iso_frame_desc
[i
].length
=
1263 subs
->transfer_done
= 0;
1266 if (i
< ctx
->packets
) {
1267 /* add a transfer delimiter */
1268 urb
->iso_frame_desc
[i
].offset
=
1270 urb
->iso_frame_desc
[i
].length
= 0;
1271 urb
->number_of_packets
++;
1276 if (period_elapsed
&&
1277 !snd_usb_endpoint_implict_feedback_sink(subs
->data_endpoint
)) /* finish at the period boundary */
1280 bytes
= frames
* stride
;
1281 if (subs
->hwptr_done
+ bytes
> runtime
->buffer_size
* stride
) {
1282 /* err, the transferred area goes over buffer boundary. */
1283 unsigned int bytes1
=
1284 runtime
->buffer_size
* stride
- subs
->hwptr_done
;
1285 memcpy(urb
->transfer_buffer
,
1286 runtime
->dma_area
+ subs
->hwptr_done
, bytes1
);
1287 memcpy(urb
->transfer_buffer
+ bytes1
,
1288 runtime
->dma_area
, bytes
- bytes1
);
1290 memcpy(urb
->transfer_buffer
,
1291 runtime
->dma_area
+ subs
->hwptr_done
, bytes
);
1293 subs
->hwptr_done
+= bytes
;
1294 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1295 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1297 /* update delay with exact number of samples queued */
1298 runtime
->delay
= subs
->last_delay
;
1299 runtime
->delay
+= frames
;
1300 subs
->last_delay
= runtime
->delay
;
1302 /* realign last_frame_number */
1303 subs
->last_frame_number
= usb_get_current_frame_number(subs
->dev
);
1304 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1306 spin_unlock_irqrestore(&subs
->lock
, flags
);
1307 urb
->transfer_buffer_length
= bytes
;
1309 snd_pcm_period_elapsed(subs
->pcm_substream
);
1313 * process after playback data complete
1314 * - decrease the delay count again
1316 static void retire_playback_urb(struct snd_usb_substream
*subs
,
1319 unsigned long flags
;
1320 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1321 int stride
= runtime
->frame_bits
>> 3;
1322 int processed
= urb
->transfer_buffer_length
/ stride
;
1325 /* ignore the delay accounting when procssed=0 is given, i.e.
1326 * silent payloads are procssed before handling the actual data
1331 spin_lock_irqsave(&subs
->lock
, flags
);
1332 if (!subs
->last_delay
)
1333 goto out
; /* short path */
1335 est_delay
= snd_usb_pcm_delay(subs
, runtime
->rate
);
1336 /* update delay with exact number of samples played */
1337 if (processed
> subs
->last_delay
)
1338 subs
->last_delay
= 0;
1340 subs
->last_delay
-= processed
;
1341 runtime
->delay
= subs
->last_delay
;
1344 * Report when delay estimate is off by more than 2ms.
1345 * The error should be lower than 2ms since the estimate relies
1346 * on two reads of a counter updated every ms.
1348 if (abs(est_delay
- subs
->last_delay
) * 1000 > runtime
->rate
* 2)
1349 snd_printk(KERN_DEBUG
"delay: estimated %d, actual %d\n",
1350 est_delay
, subs
->last_delay
);
1352 if (!subs
->running
) {
1353 /* update last_frame_number for delay counting here since
1354 * prepare_playback_urb won't be called during pause
1356 subs
->last_frame_number
=
1357 usb_get_current_frame_number(subs
->dev
) & 0xff;
1361 spin_unlock_irqrestore(&subs
->lock
, flags
);
1364 static int snd_usb_playback_open(struct snd_pcm_substream
*substream
)
1366 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1369 static int snd_usb_playback_close(struct snd_pcm_substream
*substream
)
1371 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1374 static int snd_usb_capture_open(struct snd_pcm_substream
*substream
)
1376 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1379 static int snd_usb_capture_close(struct snd_pcm_substream
*substream
)
1381 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1384 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream
*substream
,
1387 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1390 case SNDRV_PCM_TRIGGER_START
:
1391 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1392 subs
->data_endpoint
->prepare_data_urb
= prepare_playback_urb
;
1393 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1396 case SNDRV_PCM_TRIGGER_STOP
:
1397 stop_endpoints(subs
, false);
1400 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1401 subs
->data_endpoint
->prepare_data_urb
= NULL
;
1402 /* keep retire_data_urb for delay calculation */
1403 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1411 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream
*substream
,
1415 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1418 case SNDRV_PCM_TRIGGER_START
:
1419 err
= start_endpoints(subs
, false);
1423 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1426 case SNDRV_PCM_TRIGGER_STOP
:
1427 stop_endpoints(subs
, false);
1430 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1431 subs
->data_endpoint
->retire_data_urb
= NULL
;
1434 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1435 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1443 static struct snd_pcm_ops snd_usb_playback_ops
= {
1444 .open
= snd_usb_playback_open
,
1445 .close
= snd_usb_playback_close
,
1446 .ioctl
= snd_pcm_lib_ioctl
,
1447 .hw_params
= snd_usb_hw_params
,
1448 .hw_free
= snd_usb_hw_free
,
1449 .prepare
= snd_usb_pcm_prepare
,
1450 .trigger
= snd_usb_substream_playback_trigger
,
1451 .pointer
= snd_usb_pcm_pointer
,
1452 .page
= snd_pcm_lib_get_vmalloc_page
,
1453 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1456 static struct snd_pcm_ops snd_usb_capture_ops
= {
1457 .open
= snd_usb_capture_open
,
1458 .close
= snd_usb_capture_close
,
1459 .ioctl
= snd_pcm_lib_ioctl
,
1460 .hw_params
= snd_usb_hw_params
,
1461 .hw_free
= snd_usb_hw_free
,
1462 .prepare
= snd_usb_pcm_prepare
,
1463 .trigger
= snd_usb_substream_capture_trigger
,
1464 .pointer
= snd_usb_pcm_pointer
,
1465 .page
= snd_pcm_lib_get_vmalloc_page
,
1466 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1469 void snd_usb_set_pcm_ops(struct snd_pcm
*pcm
, int stream
)
1471 snd_pcm_set_ops(pcm
, stream
,
1472 stream
== SNDRV_PCM_STREAM_PLAYBACK
?
1473 &snd_usb_playback_ops
: &snd_usb_capture_ops
);