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/bitrev.h>
20 #include <linux/ratelimit.h>
21 #include <linux/usb.h>
22 #include <linux/usb/audio.h>
23 #include <linux/usb/audio-v2.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
40 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
41 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
43 /* return the estimated delay based on USB frame counters */
44 snd_pcm_uframes_t
snd_usb_pcm_delay(struct snd_usb_substream
*subs
,
47 int current_frame_number
;
51 if (!subs
->last_delay
)
52 return 0; /* short path */
54 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
56 * HCD implementations use different widths, use lower 8 bits.
57 * The delay will be managed up to 256ms, which is more than
60 frame_diff
= (current_frame_number
- subs
->last_frame_number
) & 0xff;
62 /* Approximation based on number of samples per USB frame (ms),
63 some truncation for 44.1 but the estimate is good enough */
64 est_delay
= frame_diff
* rate
/ 1000;
65 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
66 est_delay
= subs
->last_delay
- est_delay
;
68 est_delay
= subs
->last_delay
+ est_delay
;
76 * return the current pcm pointer. just based on the hwptr_done value.
78 static snd_pcm_uframes_t
snd_usb_pcm_pointer(struct snd_pcm_substream
*substream
)
80 struct snd_usb_substream
*subs
;
81 unsigned int hwptr_done
;
83 subs
= (struct snd_usb_substream
*)substream
->runtime
->private_data
;
84 if (atomic_read(&subs
->stream
->chip
->shutdown
))
85 return SNDRV_PCM_POS_XRUN
;
86 spin_lock(&subs
->lock
);
87 hwptr_done
= subs
->hwptr_done
;
88 substream
->runtime
->delay
= snd_usb_pcm_delay(subs
,
89 substream
->runtime
->rate
);
90 spin_unlock(&subs
->lock
);
91 return hwptr_done
/ (substream
->runtime
->frame_bits
>> 3);
95 * find a matching audio format
97 static struct audioformat
*find_format(struct snd_usb_substream
*subs
)
99 struct audioformat
*fp
;
100 struct audioformat
*found
= NULL
;
101 int cur_attr
= 0, attr
;
103 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
104 if (!(fp
->formats
& pcm_format_to_bits(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 usb_audio_err(chip
, "%d:%d: cannot set enable PITCH\n",
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 usb_audio_err(chip
, "%d:%d: cannot set enable PITCH (v2)\n",
192 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 /* if endpoint doesn't have pitch control, bail out */
207 if (!(fmt
->attributes
& UAC_EP_CS_ATTR_PITCH_CONTROL
))
210 switch (fmt
->protocol
) {
213 return init_pitch_v1(chip
, iface
, alts
, fmt
);
216 return init_pitch_v2(chip
, iface
, alts
, fmt
);
220 static int start_endpoints(struct snd_usb_substream
*subs
, bool can_sleep
)
224 if (!subs
->data_endpoint
)
227 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
)) {
228 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
230 dev_dbg(&subs
->dev
->dev
, "Starting data EP @%p\n", ep
);
232 ep
->data_subs
= subs
;
233 err
= snd_usb_endpoint_start(ep
, can_sleep
);
235 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
);
240 if (subs
->sync_endpoint
&&
241 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
)) {
242 struct snd_usb_endpoint
*ep
= subs
->sync_endpoint
;
244 if (subs
->data_endpoint
->iface
!= subs
->sync_endpoint
->iface
||
245 subs
->data_endpoint
->altsetting
!= subs
->sync_endpoint
->altsetting
) {
246 err
= usb_set_interface(subs
->dev
,
247 subs
->sync_endpoint
->iface
,
248 subs
->sync_endpoint
->altsetting
);
250 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
);
251 dev_err(&subs
->dev
->dev
,
252 "%d:%d: cannot set interface (%d)\n",
253 subs
->sync_endpoint
->iface
,
254 subs
->sync_endpoint
->altsetting
, err
);
259 dev_dbg(&subs
->dev
->dev
, "Starting sync EP @%p\n", ep
);
261 ep
->sync_slave
= subs
->data_endpoint
;
262 err
= snd_usb_endpoint_start(ep
, can_sleep
);
264 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
);
272 static void stop_endpoints(struct snd_usb_substream
*subs
, bool wait
)
274 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
))
275 snd_usb_endpoint_stop(subs
->sync_endpoint
);
277 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
))
278 snd_usb_endpoint_stop(subs
->data_endpoint
);
281 snd_usb_endpoint_sync_pending_stop(subs
->sync_endpoint
);
282 snd_usb_endpoint_sync_pending_stop(subs
->data_endpoint
);
286 static int search_roland_implicit_fb(struct usb_device
*dev
, int ifnum
,
287 unsigned int altsetting
,
288 struct usb_host_interface
**alts
,
291 struct usb_interface
*iface
;
292 struct usb_interface_descriptor
*altsd
;
293 struct usb_endpoint_descriptor
*epd
;
295 iface
= usb_ifnum_to_if(dev
, ifnum
);
296 if (!iface
|| iface
->num_altsetting
< altsetting
+ 1)
298 *alts
= &iface
->altsetting
[altsetting
];
299 altsd
= get_iface_desc(*alts
);
300 if (altsd
->bAlternateSetting
!= altsetting
||
301 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
||
302 (altsd
->bInterfaceSubClass
!= 2 &&
303 altsd
->bInterfaceProtocol
!= 2 ) ||
304 altsd
->bNumEndpoints
< 1)
306 epd
= get_endpoint(*alts
, 0);
307 if (!usb_endpoint_is_isoc_in(epd
) ||
308 (epd
->bmAttributes
& USB_ENDPOINT_USAGE_MASK
) !=
309 USB_ENDPOINT_USAGE_IMPLICIT_FB
)
311 *ep
= epd
->bEndpointAddress
;
315 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream
*subs
,
316 struct usb_device
*dev
,
317 struct usb_interface_descriptor
*altsd
,
320 struct usb_host_interface
*alts
;
321 struct usb_interface
*iface
;
324 /* Implicit feedback sync EPs consumers are always playback EPs */
325 if (subs
->direction
!= SNDRV_PCM_STREAM_PLAYBACK
)
328 switch (subs
->stream
->chip
->usb_id
) {
329 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
330 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
332 iface
= usb_ifnum_to_if(dev
, 3);
334 if (!iface
|| iface
->num_altsetting
== 0)
337 alts
= &iface
->altsetting
[1];
340 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
341 case USB_ID(0x0763, 0x2081):
343 iface
= usb_ifnum_to_if(dev
, 2);
345 if (!iface
|| iface
->num_altsetting
== 0)
348 alts
= &iface
->altsetting
[1];
351 if (attr
== USB_ENDPOINT_SYNC_ASYNC
&&
352 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
&&
353 altsd
->bInterfaceProtocol
== 2 &&
354 altsd
->bNumEndpoints
== 1 &&
355 USB_ID_VENDOR(subs
->stream
->chip
->usb_id
) == 0x0582 /* Roland */ &&
356 search_roland_implicit_fb(dev
, altsd
->bInterfaceNumber
+ 1,
357 altsd
->bAlternateSetting
,
366 subs
->sync_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
367 alts
, ep
, !subs
->direction
,
368 SND_USB_ENDPOINT_TYPE_DATA
);
369 if (!subs
->sync_endpoint
)
372 subs
->data_endpoint
->sync_master
= subs
->sync_endpoint
;
377 static int set_sync_endpoint(struct snd_usb_substream
*subs
,
378 struct audioformat
*fmt
,
379 struct usb_device
*dev
,
380 struct usb_host_interface
*alts
,
381 struct usb_interface_descriptor
*altsd
)
383 int is_playback
= subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
;
384 unsigned int ep
, attr
;
388 /* we need a sync pipe in async OUT or adaptive IN mode */
389 /* check the number of EP, since some devices have broken
390 * descriptors which fool us. if it has only one EP,
391 * assume it as adaptive-out or sync-in.
393 attr
= fmt
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
395 if ((is_playback
&& (attr
!= USB_ENDPOINT_SYNC_ASYNC
)) ||
396 (!is_playback
&& (attr
!= USB_ENDPOINT_SYNC_ADAPTIVE
))) {
399 * In these modes the notion of sync_endpoint is irrelevant.
400 * Reset pointers to avoid using stale data from previously
401 * used settings, e.g. when configuration and endpoints were
405 subs
->sync_endpoint
= NULL
;
406 subs
->data_endpoint
->sync_master
= NULL
;
409 err
= set_sync_ep_implicit_fb_quirk(subs
, dev
, altsd
, attr
);
413 if (altsd
->bNumEndpoints
< 2)
416 if ((is_playback
&& (attr
== USB_ENDPOINT_SYNC_SYNC
||
417 attr
== USB_ENDPOINT_SYNC_ADAPTIVE
)) ||
418 (!is_playback
&& attr
!= USB_ENDPOINT_SYNC_ADAPTIVE
))
422 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
423 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
424 * error fall back to SYNC mode and don't create sync endpoint
427 /* check sync-pipe endpoint */
428 /* ... and check descriptor size before accessing bSynchAddress
429 because there is a version of the SB Audigy 2 NX firmware lacking
430 the audio fields in the endpoint descriptors */
431 if ((get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) != USB_ENDPOINT_XFER_ISOC
||
432 (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
433 get_endpoint(alts
, 1)->bSynchAddress
!= 0)) {
435 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
436 fmt
->iface
, fmt
->altsetting
,
437 get_endpoint(alts
, 1)->bmAttributes
,
438 get_endpoint(alts
, 1)->bLength
,
439 get_endpoint(alts
, 1)->bSynchAddress
);
440 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
444 ep
= get_endpoint(alts
, 1)->bEndpointAddress
;
445 if (get_endpoint(alts
, 0)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
446 ((is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
| USB_DIR_IN
)) ||
447 (!is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
& ~USB_DIR_IN
)))) {
449 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
450 fmt
->iface
, fmt
->altsetting
,
451 is_playback
, ep
, get_endpoint(alts
, 0)->bSynchAddress
);
452 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
457 implicit_fb
= (get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_USAGE_MASK
)
458 == USB_ENDPOINT_USAGE_IMPLICIT_FB
;
460 subs
->sync_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
461 alts
, ep
, !subs
->direction
,
463 SND_USB_ENDPOINT_TYPE_DATA
:
464 SND_USB_ENDPOINT_TYPE_SYNC
);
465 if (!subs
->sync_endpoint
) {
466 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
471 subs
->data_endpoint
->sync_master
= subs
->sync_endpoint
;
477 * find a matching format and set up the interface
479 static int set_format(struct snd_usb_substream
*subs
, struct audioformat
*fmt
)
481 struct usb_device
*dev
= subs
->dev
;
482 struct usb_host_interface
*alts
;
483 struct usb_interface_descriptor
*altsd
;
484 struct usb_interface
*iface
;
487 iface
= usb_ifnum_to_if(dev
, fmt
->iface
);
490 alts
= &iface
->altsetting
[fmt
->altset_idx
];
491 altsd
= get_iface_desc(alts
);
492 if (WARN_ON(altsd
->bAlternateSetting
!= fmt
->altsetting
))
495 if (fmt
== subs
->cur_audiofmt
)
498 /* close the old interface */
499 if (subs
->interface
>= 0 && subs
->interface
!= fmt
->iface
) {
500 err
= usb_set_interface(subs
->dev
, subs
->interface
, 0);
503 "%d:%d: return to setting 0 failed (%d)\n",
504 fmt
->iface
, fmt
->altsetting
, err
);
507 subs
->interface
= -1;
508 subs
->altset_idx
= 0;
512 if (subs
->interface
!= fmt
->iface
||
513 subs
->altset_idx
!= fmt
->altset_idx
) {
515 err
= snd_usb_select_mode_quirk(subs
, fmt
);
519 err
= usb_set_interface(dev
, fmt
->iface
, fmt
->altsetting
);
522 "%d:%d: usb_set_interface failed (%d)\n",
523 fmt
->iface
, fmt
->altsetting
, err
);
526 dev_dbg(&dev
->dev
, "setting usb interface %d:%d\n",
527 fmt
->iface
, fmt
->altsetting
);
528 subs
->interface
= fmt
->iface
;
529 subs
->altset_idx
= fmt
->altset_idx
;
531 snd_usb_set_interface_quirk(dev
);
534 subs
->data_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
535 alts
, fmt
->endpoint
, subs
->direction
,
536 SND_USB_ENDPOINT_TYPE_DATA
);
538 if (!subs
->data_endpoint
)
541 err
= set_sync_endpoint(subs
, fmt
, dev
, alts
, altsd
);
545 err
= snd_usb_init_pitch(subs
->stream
->chip
, fmt
->iface
, alts
, fmt
);
549 subs
->cur_audiofmt
= fmt
;
551 snd_usb_set_format_quirk(subs
, fmt
);
557 * Return the score of matching two audioformats.
558 * Veto the audioformat if:
559 * - It has no channels for some reason.
560 * - Requested PCM format is not supported.
561 * - Requested sample rate is not supported.
563 static int match_endpoint_audioformats(struct snd_usb_substream
*subs
,
564 struct audioformat
*fp
,
565 struct audioformat
*match
, int rate
,
566 snd_pcm_format_t pcm_format
)
571 if (fp
->channels
< 1) {
572 dev_dbg(&subs
->dev
->dev
,
573 "%s: (fmt @%p) no channels\n", __func__
, fp
);
577 if (!(fp
->formats
& pcm_format_to_bits(pcm_format
))) {
578 dev_dbg(&subs
->dev
->dev
,
579 "%s: (fmt @%p) no match for format %d\n", __func__
,
584 for (i
= 0; i
< fp
->nr_rates
; i
++) {
585 if (fp
->rate_table
[i
] == rate
) {
591 dev_dbg(&subs
->dev
->dev
,
592 "%s: (fmt @%p) no match for rate %d\n", __func__
,
597 if (fp
->channels
== match
->channels
)
600 dev_dbg(&subs
->dev
->dev
,
601 "%s: (fmt @%p) score %d\n", __func__
, fp
, score
);
607 * Configure the sync ep using the rate and pcm format of the data ep.
609 static int configure_sync_endpoint(struct snd_usb_substream
*subs
)
612 struct audioformat
*fp
;
613 struct audioformat
*sync_fp
= NULL
;
615 int sync_period_bytes
= subs
->period_bytes
;
616 struct snd_usb_substream
*sync_subs
=
617 &subs
->stream
->substream
[subs
->direction
^ 1];
619 if (subs
->sync_endpoint
->type
!= SND_USB_ENDPOINT_TYPE_DATA
||
621 return snd_usb_endpoint_set_params(subs
->sync_endpoint
,
630 /* Try to find the best matching audioformat. */
631 list_for_each_entry(fp
, &sync_subs
->fmt_list
, list
) {
632 int score
= match_endpoint_audioformats(subs
,
633 fp
, subs
->cur_audiofmt
,
634 subs
->cur_rate
, subs
->pcm_format
);
636 if (score
> cur_score
) {
642 if (unlikely(sync_fp
== NULL
)) {
643 dev_err(&subs
->dev
->dev
,
644 "%s: no valid audioformat for sync ep %x found\n",
645 __func__
, sync_subs
->ep_num
);
650 * Recalculate the period bytes if channel number differ between
651 * data and sync ep audioformat.
653 if (sync_fp
->channels
!= subs
->channels
) {
654 sync_period_bytes
= (subs
->period_bytes
/ subs
->channels
) *
656 dev_dbg(&subs
->dev
->dev
,
657 "%s: adjusted sync ep period bytes (%d -> %d)\n",
658 __func__
, subs
->period_bytes
, sync_period_bytes
);
661 ret
= snd_usb_endpoint_set_params(subs
->sync_endpoint
,
674 * configure endpoint params
676 * called during initial setup and upon resume
678 static int configure_endpoint(struct snd_usb_substream
*subs
)
683 stop_endpoints(subs
, true);
684 ret
= snd_usb_endpoint_set_params(subs
->data_endpoint
,
689 subs
->buffer_periods
,
692 subs
->sync_endpoint
);
696 if (subs
->sync_endpoint
)
697 ret
= configure_sync_endpoint(subs
);
705 * allocate a buffer and set the given audio format.
707 * so far we use a physically linear buffer although packetize transfer
708 * doesn't need a continuous area.
709 * if sg buffer is supported on the later version of alsa, we'll follow
712 static int snd_usb_hw_params(struct snd_pcm_substream
*substream
,
713 struct snd_pcm_hw_params
*hw_params
)
715 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
716 struct audioformat
*fmt
;
719 ret
= media_snd_start_pipeline(subs
);
723 ret
= snd_pcm_lib_alloc_vmalloc_buffer(substream
,
724 params_buffer_bytes(hw_params
));
728 subs
->pcm_format
= params_format(hw_params
);
729 subs
->period_bytes
= params_period_bytes(hw_params
);
730 subs
->period_frames
= params_period_size(hw_params
);
731 subs
->buffer_periods
= params_periods(hw_params
);
732 subs
->channels
= params_channels(hw_params
);
733 subs
->cur_rate
= params_rate(hw_params
);
735 fmt
= find_format(subs
);
737 dev_dbg(&subs
->dev
->dev
,
738 "cannot set format: format = %#x, rate = %d, channels = %d\n",
739 subs
->pcm_format
, subs
->cur_rate
, subs
->channels
);
744 ret
= snd_usb_lock_shutdown(subs
->stream
->chip
);
747 ret
= set_format(subs
, fmt
);
748 snd_usb_unlock_shutdown(subs
->stream
->chip
);
752 subs
->interface
= fmt
->iface
;
753 subs
->altset_idx
= fmt
->altset_idx
;
754 subs
->need_setup_ep
= true;
759 media_snd_stop_pipeline(subs
);
766 * reset the audio format and release the buffer
768 static int snd_usb_hw_free(struct snd_pcm_substream
*substream
)
770 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
772 media_snd_stop_pipeline(subs
);
773 subs
->cur_audiofmt
= NULL
;
775 subs
->period_bytes
= 0;
776 if (!snd_usb_lock_shutdown(subs
->stream
->chip
)) {
777 stop_endpoints(subs
, true);
778 snd_usb_endpoint_deactivate(subs
->sync_endpoint
);
779 snd_usb_endpoint_deactivate(subs
->data_endpoint
);
780 snd_usb_unlock_shutdown(subs
->stream
->chip
);
782 return snd_pcm_lib_free_vmalloc_buffer(substream
);
788 * only a few subtle things...
790 static int snd_usb_pcm_prepare(struct snd_pcm_substream
*substream
)
792 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
793 struct snd_usb_substream
*subs
= runtime
->private_data
;
794 struct usb_host_interface
*alts
;
795 struct usb_interface
*iface
;
798 if (! subs
->cur_audiofmt
) {
799 dev_err(&subs
->dev
->dev
, "no format is specified!\n");
803 ret
= snd_usb_lock_shutdown(subs
->stream
->chip
);
806 if (snd_BUG_ON(!subs
->data_endpoint
)) {
811 snd_usb_endpoint_sync_pending_stop(subs
->sync_endpoint
);
812 snd_usb_endpoint_sync_pending_stop(subs
->data_endpoint
);
814 ret
= set_format(subs
, subs
->cur_audiofmt
);
818 iface
= usb_ifnum_to_if(subs
->dev
, subs
->cur_audiofmt
->iface
);
819 alts
= &iface
->altsetting
[subs
->cur_audiofmt
->altset_idx
];
820 ret
= snd_usb_init_sample_rate(subs
->stream
->chip
,
821 subs
->cur_audiofmt
->iface
,
828 if (subs
->need_setup_ep
) {
829 ret
= configure_endpoint(subs
);
832 subs
->need_setup_ep
= false;
835 /* some unit conversions in runtime */
836 subs
->data_endpoint
->maxframesize
=
837 bytes_to_frames(runtime
, subs
->data_endpoint
->maxpacksize
);
838 subs
->data_endpoint
->curframesize
=
839 bytes_to_frames(runtime
, subs
->data_endpoint
->curpacksize
);
841 /* reset the pointer */
842 subs
->hwptr_done
= 0;
843 subs
->transfer_done
= 0;
844 subs
->last_delay
= 0;
845 subs
->last_frame_number
= 0;
848 /* for playback, submit the URBs now; otherwise, the first hwptr_done
849 * updates for all URBs would happen at the same time when starting */
850 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
851 ret
= start_endpoints(subs
, true);
854 snd_usb_unlock_shutdown(subs
->stream
->chip
);
858 static struct snd_pcm_hardware snd_usb_hardware
=
860 .info
= SNDRV_PCM_INFO_MMAP
|
861 SNDRV_PCM_INFO_MMAP_VALID
|
862 SNDRV_PCM_INFO_BATCH
|
863 SNDRV_PCM_INFO_INTERLEAVED
|
864 SNDRV_PCM_INFO_BLOCK_TRANSFER
|
865 SNDRV_PCM_INFO_PAUSE
,
866 .buffer_bytes_max
= 1024 * 1024,
867 .period_bytes_min
= 64,
868 .period_bytes_max
= 512 * 1024,
873 static int hw_check_valid_format(struct snd_usb_substream
*subs
,
874 struct snd_pcm_hw_params
*params
,
875 struct audioformat
*fp
)
877 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
878 struct snd_interval
*ct
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
879 struct snd_mask
*fmts
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
880 struct snd_interval
*pt
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
881 struct snd_mask check_fmts
;
884 /* check the format */
885 snd_mask_none(&check_fmts
);
886 check_fmts
.bits
[0] = (u32
)fp
->formats
;
887 check_fmts
.bits
[1] = (u32
)(fp
->formats
>> 32);
888 snd_mask_intersect(&check_fmts
, fmts
);
889 if (snd_mask_empty(&check_fmts
)) {
890 hwc_debug(" > check: no supported format %d\n", fp
->format
);
893 /* check the channels */
894 if (fp
->channels
< ct
->min
|| fp
->channels
> ct
->max
) {
895 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp
->channels
, ct
->min
, ct
->max
);
898 /* check the rate is within the range */
899 if (fp
->rate_min
> it
->max
|| (fp
->rate_min
== it
->max
&& it
->openmax
)) {
900 hwc_debug(" > check: rate_min %d > max %d\n", fp
->rate_min
, it
->max
);
903 if (fp
->rate_max
< it
->min
|| (fp
->rate_max
== it
->min
&& it
->openmin
)) {
904 hwc_debug(" > check: rate_max %d < min %d\n", fp
->rate_max
, it
->min
);
907 /* check whether the period time is >= the data packet interval */
908 if (subs
->speed
!= USB_SPEED_FULL
) {
909 ptime
= 125 * (1 << fp
->datainterval
);
910 if (ptime
> pt
->max
|| (ptime
== pt
->max
&& pt
->openmax
)) {
911 hwc_debug(" > check: ptime %u > max %u\n", ptime
, pt
->max
);
918 static int hw_rule_rate(struct snd_pcm_hw_params
*params
,
919 struct snd_pcm_hw_rule
*rule
)
921 struct snd_usb_substream
*subs
= rule
->private;
922 struct audioformat
*fp
;
923 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
924 unsigned int rmin
, rmax
;
927 hwc_debug("hw_rule_rate: (%d,%d)\n", it
->min
, it
->max
);
930 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
931 if (!hw_check_valid_format(subs
, params
, fp
))
934 if (rmin
> fp
->rate_min
)
936 if (rmax
< fp
->rate_max
)
945 hwc_debug(" --> get empty\n");
951 if (it
->min
< rmin
) {
956 if (it
->max
> rmax
) {
961 if (snd_interval_checkempty(it
)) {
965 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
970 static int hw_rule_channels(struct snd_pcm_hw_params
*params
,
971 struct snd_pcm_hw_rule
*rule
)
973 struct snd_usb_substream
*subs
= rule
->private;
974 struct audioformat
*fp
;
975 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
976 unsigned int rmin
, rmax
;
979 hwc_debug("hw_rule_channels: (%d,%d)\n", it
->min
, it
->max
);
982 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
983 if (!hw_check_valid_format(subs
, params
, fp
))
986 if (rmin
> fp
->channels
)
988 if (rmax
< fp
->channels
)
997 hwc_debug(" --> get empty\n");
1003 if (it
->min
< rmin
) {
1008 if (it
->max
> rmax
) {
1013 if (snd_interval_checkempty(it
)) {
1017 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
1021 static int hw_rule_format(struct snd_pcm_hw_params
*params
,
1022 struct snd_pcm_hw_rule
*rule
)
1024 struct snd_usb_substream
*subs
= rule
->private;
1025 struct audioformat
*fp
;
1026 struct snd_mask
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
1031 hwc_debug("hw_rule_format: %x:%x\n", fmt
->bits
[0], fmt
->bits
[1]);
1033 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1034 if (!hw_check_valid_format(subs
, params
, fp
))
1036 fbits
|= fp
->formats
;
1039 oldbits
[0] = fmt
->bits
[0];
1040 oldbits
[1] = fmt
->bits
[1];
1041 fmt
->bits
[0] &= (u32
)fbits
;
1042 fmt
->bits
[1] &= (u32
)(fbits
>> 32);
1043 if (!fmt
->bits
[0] && !fmt
->bits
[1]) {
1044 hwc_debug(" --> get empty\n");
1047 changed
= (oldbits
[0] != fmt
->bits
[0] || oldbits
[1] != fmt
->bits
[1]);
1048 hwc_debug(" --> %x:%x (changed = %d)\n", fmt
->bits
[0], fmt
->bits
[1], changed
);
1052 static int hw_rule_period_time(struct snd_pcm_hw_params
*params
,
1053 struct snd_pcm_hw_rule
*rule
)
1055 struct snd_usb_substream
*subs
= rule
->private;
1056 struct audioformat
*fp
;
1057 struct snd_interval
*it
;
1058 unsigned char min_datainterval
;
1062 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
1063 hwc_debug("hw_rule_period_time: (%u,%u)\n", it
->min
, it
->max
);
1064 min_datainterval
= 0xff;
1065 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1066 if (!hw_check_valid_format(subs
, params
, fp
))
1068 min_datainterval
= min(min_datainterval
, fp
->datainterval
);
1070 if (min_datainterval
== 0xff) {
1071 hwc_debug(" --> get empty\n");
1075 pmin
= 125 * (1 << min_datainterval
);
1077 if (it
->min
< pmin
) {
1082 if (snd_interval_checkempty(it
)) {
1086 hwc_debug(" --> (%u,%u) (changed = %d)\n", it
->min
, it
->max
, changed
);
1091 * If the device supports unusual bit rates, does the request meet these?
1093 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime
*runtime
,
1094 struct snd_usb_substream
*subs
)
1096 struct audioformat
*fp
;
1098 int count
= 0, needs_knot
= 0;
1101 kfree(subs
->rate_list
.list
);
1102 subs
->rate_list
.list
= NULL
;
1104 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1105 if (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)
1107 count
+= fp
->nr_rates
;
1108 if (fp
->rates
& SNDRV_PCM_RATE_KNOT
)
1114 subs
->rate_list
.list
= rate_list
=
1115 kmalloc(sizeof(int) * count
, GFP_KERNEL
);
1116 if (!subs
->rate_list
.list
)
1118 subs
->rate_list
.count
= count
;
1119 subs
->rate_list
.mask
= 0;
1121 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1123 for (i
= 0; i
< fp
->nr_rates
; i
++)
1124 rate_list
[count
++] = fp
->rate_table
[i
];
1126 err
= snd_pcm_hw_constraint_list(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1136 * set up the runtime hardware information.
1139 static int setup_hw_info(struct snd_pcm_runtime
*runtime
, struct snd_usb_substream
*subs
)
1141 struct audioformat
*fp
;
1142 unsigned int pt
, ptmin
;
1143 int param_period_time_if_needed
;
1146 runtime
->hw
.formats
= subs
->formats
;
1148 runtime
->hw
.rate_min
= 0x7fffffff;
1149 runtime
->hw
.rate_max
= 0;
1150 runtime
->hw
.channels_min
= 256;
1151 runtime
->hw
.channels_max
= 0;
1152 runtime
->hw
.rates
= 0;
1154 /* check min/max rates and channels */
1155 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1156 runtime
->hw
.rates
|= fp
->rates
;
1157 if (runtime
->hw
.rate_min
> fp
->rate_min
)
1158 runtime
->hw
.rate_min
= fp
->rate_min
;
1159 if (runtime
->hw
.rate_max
< fp
->rate_max
)
1160 runtime
->hw
.rate_max
= fp
->rate_max
;
1161 if (runtime
->hw
.channels_min
> fp
->channels
)
1162 runtime
->hw
.channels_min
= fp
->channels
;
1163 if (runtime
->hw
.channels_max
< fp
->channels
)
1164 runtime
->hw
.channels_max
= fp
->channels
;
1165 if (fp
->fmt_type
== UAC_FORMAT_TYPE_II
&& fp
->frame_size
> 0) {
1166 /* FIXME: there might be more than one audio formats... */
1167 runtime
->hw
.period_bytes_min
= runtime
->hw
.period_bytes_max
=
1170 pt
= 125 * (1 << fp
->datainterval
);
1171 ptmin
= min(ptmin
, pt
);
1173 err
= snd_usb_autoresume(subs
->stream
->chip
);
1177 param_period_time_if_needed
= SNDRV_PCM_HW_PARAM_PERIOD_TIME
;
1178 if (subs
->speed
== USB_SPEED_FULL
)
1179 /* full speed devices have fixed data packet interval */
1182 /* if period time doesn't go below 1 ms, no rules needed */
1183 param_period_time_if_needed
= -1;
1184 snd_pcm_hw_constraint_minmax(runtime
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1187 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1189 SNDRV_PCM_HW_PARAM_FORMAT
,
1190 SNDRV_PCM_HW_PARAM_CHANNELS
,
1191 param_period_time_if_needed
,
1194 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
1195 hw_rule_channels
, subs
,
1196 SNDRV_PCM_HW_PARAM_FORMAT
,
1197 SNDRV_PCM_HW_PARAM_RATE
,
1198 param_period_time_if_needed
,
1201 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
1202 hw_rule_format
, subs
,
1203 SNDRV_PCM_HW_PARAM_RATE
,
1204 SNDRV_PCM_HW_PARAM_CHANNELS
,
1205 param_period_time_if_needed
,
1208 if (param_period_time_if_needed
>= 0) {
1209 err
= snd_pcm_hw_rule_add(runtime
, 0,
1210 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1211 hw_rule_period_time
, subs
,
1212 SNDRV_PCM_HW_PARAM_FORMAT
,
1213 SNDRV_PCM_HW_PARAM_CHANNELS
,
1214 SNDRV_PCM_HW_PARAM_RATE
,
1219 if ((err
= snd_usb_pcm_check_knot(runtime
, subs
)) < 0)
1224 snd_usb_autosuspend(subs
->stream
->chip
);
1228 static int snd_usb_pcm_open(struct snd_pcm_substream
*substream
, int direction
)
1230 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1231 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1232 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1235 subs
->interface
= -1;
1236 subs
->altset_idx
= 0;
1237 runtime
->hw
= snd_usb_hardware
;
1238 runtime
->private_data
= subs
;
1239 subs
->pcm_substream
= substream
;
1240 /* runtime PM is also done there */
1242 /* initialize DSD/DOP context */
1243 subs
->dsd_dop
.byte_idx
= 0;
1244 subs
->dsd_dop
.channel
= 0;
1245 subs
->dsd_dop
.marker
= 1;
1247 ret
= setup_hw_info(runtime
, subs
);
1249 ret
= media_snd_stream_init(subs
, as
->pcm
, direction
);
1251 snd_usb_autosuspend(subs
->stream
->chip
);
1255 static int snd_usb_pcm_close(struct snd_pcm_substream
*substream
, int direction
)
1257 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1258 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1260 stop_endpoints(subs
, true);
1261 media_snd_stop_pipeline(subs
);
1263 if (subs
->interface
>= 0 &&
1264 !snd_usb_lock_shutdown(subs
->stream
->chip
)) {
1265 usb_set_interface(subs
->dev
, subs
->interface
, 0);
1266 subs
->interface
= -1;
1267 snd_usb_unlock_shutdown(subs
->stream
->chip
);
1270 subs
->pcm_substream
= NULL
;
1271 snd_usb_autosuspend(subs
->stream
->chip
);
1276 /* Since a URB can handle only a single linear buffer, we must use double
1277 * buffering when the data to be transferred overflows the buffer boundary.
1278 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1281 static void retire_capture_urb(struct snd_usb_substream
*subs
,
1284 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1285 unsigned int stride
, frames
, bytes
, oldptr
;
1286 int i
, period_elapsed
= 0;
1287 unsigned long flags
;
1289 int current_frame_number
;
1291 /* read frame number here, update pointer in critical section */
1292 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
1294 stride
= runtime
->frame_bits
>> 3;
1296 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1297 cp
= (unsigned char *)urb
->transfer_buffer
+ urb
->iso_frame_desc
[i
].offset
+ subs
->pkt_offset_adj
;
1298 if (urb
->iso_frame_desc
[i
].status
&& printk_ratelimit()) {
1299 dev_dbg(&subs
->dev
->dev
, "frame %d active: %d\n",
1300 i
, urb
->iso_frame_desc
[i
].status
);
1303 bytes
= urb
->iso_frame_desc
[i
].actual_length
;
1304 frames
= bytes
/ stride
;
1305 if (!subs
->txfr_quirk
)
1306 bytes
= frames
* stride
;
1307 if (bytes
% (runtime
->sample_bits
>> 3) != 0) {
1308 int oldbytes
= bytes
;
1309 bytes
= frames
* stride
;
1310 dev_warn(&subs
->dev
->dev
,
1311 "Corrected urb data len. %d->%d\n",
1314 /* update the current pointer */
1315 spin_lock_irqsave(&subs
->lock
, flags
);
1316 oldptr
= subs
->hwptr_done
;
1317 subs
->hwptr_done
+= bytes
;
1318 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1319 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1320 frames
= (bytes
+ (oldptr
% stride
)) / stride
;
1321 subs
->transfer_done
+= frames
;
1322 if (subs
->transfer_done
>= runtime
->period_size
) {
1323 subs
->transfer_done
-= runtime
->period_size
;
1326 /* capture delay is by construction limited to one URB,
1329 runtime
->delay
= subs
->last_delay
= 0;
1331 /* realign last_frame_number */
1332 subs
->last_frame_number
= current_frame_number
;
1333 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1335 spin_unlock_irqrestore(&subs
->lock
, flags
);
1336 /* copy a data chunk */
1337 if (oldptr
+ bytes
> runtime
->buffer_size
* stride
) {
1338 unsigned int bytes1
=
1339 runtime
->buffer_size
* stride
- oldptr
;
1340 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes1
);
1341 memcpy(runtime
->dma_area
, cp
+ bytes1
, bytes
- bytes1
);
1343 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes
);
1348 snd_pcm_period_elapsed(subs
->pcm_substream
);
1351 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream
*subs
,
1352 struct urb
*urb
, unsigned int bytes
)
1354 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1355 unsigned int stride
= runtime
->frame_bits
>> 3;
1356 unsigned int dst_idx
= 0;
1357 unsigned int src_idx
= subs
->hwptr_done
;
1358 unsigned int wrap
= runtime
->buffer_size
* stride
;
1359 u8
*dst
= urb
->transfer_buffer
;
1360 u8
*src
= runtime
->dma_area
;
1361 u8 marker
[] = { 0x05, 0xfa };
1364 * The DSP DOP format defines a way to transport DSD samples over
1365 * normal PCM data endpoints. It requires stuffing of marker bytes
1366 * (0x05 and 0xfa, alternating per sample frame), and then expects
1367 * 2 additional bytes of actual payload. The whole frame is stored
1370 * Hence, for a stereo transport, the buffer layout looks like this,
1371 * where L refers to left channel samples and R to right.
1373 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1374 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1380 if (++subs
->dsd_dop
.byte_idx
== 3) {
1381 /* frame boundary? */
1382 dst
[dst_idx
++] = marker
[subs
->dsd_dop
.marker
];
1384 subs
->dsd_dop
.byte_idx
= 0;
1386 if (++subs
->dsd_dop
.channel
% runtime
->channels
== 0) {
1387 /* alternate the marker */
1388 subs
->dsd_dop
.marker
++;
1389 subs
->dsd_dop
.marker
%= ARRAY_SIZE(marker
);
1390 subs
->dsd_dop
.channel
= 0;
1393 /* stuff the DSD payload */
1394 int idx
= (src_idx
+ subs
->dsd_dop
.byte_idx
- 1) % wrap
;
1396 if (subs
->cur_audiofmt
->dsd_bitrev
)
1397 dst
[dst_idx
++] = bitrev8(src
[idx
]);
1399 dst
[dst_idx
++] = src
[idx
];
1404 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1405 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1408 static void copy_to_urb(struct snd_usb_substream
*subs
, struct urb
*urb
,
1409 int offset
, int stride
, unsigned int bytes
)
1411 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1413 if (subs
->hwptr_done
+ bytes
> runtime
->buffer_size
* stride
) {
1414 /* err, the transferred area goes over buffer boundary. */
1415 unsigned int bytes1
=
1416 runtime
->buffer_size
* stride
- subs
->hwptr_done
;
1417 memcpy(urb
->transfer_buffer
+ offset
,
1418 runtime
->dma_area
+ subs
->hwptr_done
, bytes1
);
1419 memcpy(urb
->transfer_buffer
+ offset
+ bytes1
,
1420 runtime
->dma_area
, bytes
- bytes1
);
1422 memcpy(urb
->transfer_buffer
+ offset
,
1423 runtime
->dma_area
+ subs
->hwptr_done
, bytes
);
1425 subs
->hwptr_done
+= bytes
;
1426 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1427 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1430 static unsigned int copy_to_urb_quirk(struct snd_usb_substream
*subs
,
1431 struct urb
*urb
, int stride
,
1434 __le32 packet_length
;
1437 /* Put __le32 length descriptor at start of each packet. */
1438 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1439 unsigned int length
= urb
->iso_frame_desc
[i
].length
;
1440 unsigned int offset
= urb
->iso_frame_desc
[i
].offset
;
1442 packet_length
= cpu_to_le32(length
);
1443 offset
+= i
* sizeof(packet_length
);
1444 urb
->iso_frame_desc
[i
].offset
= offset
;
1445 urb
->iso_frame_desc
[i
].length
+= sizeof(packet_length
);
1446 memcpy(urb
->transfer_buffer
+ offset
,
1447 &packet_length
, sizeof(packet_length
));
1448 copy_to_urb(subs
, urb
, offset
+ sizeof(packet_length
),
1451 /* Adjust transfer size accordingly. */
1452 bytes
+= urb
->number_of_packets
* sizeof(packet_length
);
1456 static void prepare_playback_urb(struct snd_usb_substream
*subs
,
1459 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1460 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1461 struct snd_urb_ctx
*ctx
= urb
->context
;
1462 unsigned int counts
, frames
, bytes
;
1463 int i
, stride
, period_elapsed
= 0;
1464 unsigned long flags
;
1466 stride
= runtime
->frame_bits
>> 3;
1469 urb
->number_of_packets
= 0;
1470 spin_lock_irqsave(&subs
->lock
, flags
);
1471 subs
->frame_limit
+= ep
->max_urb_frames
;
1472 for (i
= 0; i
< ctx
->packets
; i
++) {
1473 if (ctx
->packet_size
[i
])
1474 counts
= ctx
->packet_size
[i
];
1476 counts
= snd_usb_endpoint_next_packet_size(ep
);
1478 /* set up descriptor */
1479 urb
->iso_frame_desc
[i
].offset
= frames
* ep
->stride
;
1480 urb
->iso_frame_desc
[i
].length
= counts
* ep
->stride
;
1482 urb
->number_of_packets
++;
1483 subs
->transfer_done
+= counts
;
1484 if (subs
->transfer_done
>= runtime
->period_size
) {
1485 subs
->transfer_done
-= runtime
->period_size
;
1486 subs
->frame_limit
= 0;
1488 if (subs
->fmt_type
== UAC_FORMAT_TYPE_II
) {
1489 if (subs
->transfer_done
> 0) {
1490 /* FIXME: fill-max mode is not
1492 frames
-= subs
->transfer_done
;
1493 counts
-= subs
->transfer_done
;
1494 urb
->iso_frame_desc
[i
].length
=
1495 counts
* ep
->stride
;
1496 subs
->transfer_done
= 0;
1499 if (i
< ctx
->packets
) {
1500 /* add a transfer delimiter */
1501 urb
->iso_frame_desc
[i
].offset
=
1502 frames
* ep
->stride
;
1503 urb
->iso_frame_desc
[i
].length
= 0;
1504 urb
->number_of_packets
++;
1509 /* finish at the period boundary or after enough frames */
1510 if ((period_elapsed
||
1511 subs
->transfer_done
>= subs
->frame_limit
) &&
1512 !snd_usb_endpoint_implicit_feedback_sink(ep
))
1515 bytes
= frames
* ep
->stride
;
1517 if (unlikely(subs
->pcm_format
== SNDRV_PCM_FORMAT_DSD_U16_LE
&&
1518 subs
->cur_audiofmt
->dsd_dop
)) {
1519 fill_playback_urb_dsd_dop(subs
, urb
, bytes
);
1520 } else if (unlikely(subs
->pcm_format
== SNDRV_PCM_FORMAT_DSD_U8
&&
1521 subs
->cur_audiofmt
->dsd_bitrev
)) {
1522 /* bit-reverse the bytes */
1523 u8
*buf
= urb
->transfer_buffer
;
1524 for (i
= 0; i
< bytes
; i
++) {
1525 int idx
= (subs
->hwptr_done
+ i
)
1526 % (runtime
->buffer_size
* stride
);
1527 buf
[i
] = bitrev8(runtime
->dma_area
[idx
]);
1530 subs
->hwptr_done
+= bytes
;
1531 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1532 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1535 if (!subs
->tx_length_quirk
)
1536 copy_to_urb(subs
, urb
, 0, stride
, bytes
);
1538 bytes
= copy_to_urb_quirk(subs
, urb
, stride
, bytes
);
1539 /* bytes is now amount of outgoing data */
1542 /* update delay with exact number of samples queued */
1543 runtime
->delay
= subs
->last_delay
;
1544 runtime
->delay
+= frames
;
1545 subs
->last_delay
= runtime
->delay
;
1547 /* realign last_frame_number */
1548 subs
->last_frame_number
= usb_get_current_frame_number(subs
->dev
);
1549 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1551 if (subs
->trigger_tstamp_pending_update
) {
1552 /* this is the first actual URB submitted,
1553 * update trigger timestamp to reflect actual start time
1555 snd_pcm_gettime(runtime
, &runtime
->trigger_tstamp
);
1556 subs
->trigger_tstamp_pending_update
= false;
1559 spin_unlock_irqrestore(&subs
->lock
, flags
);
1560 urb
->transfer_buffer_length
= bytes
;
1562 snd_pcm_period_elapsed(subs
->pcm_substream
);
1566 * process after playback data complete
1567 * - decrease the delay count again
1569 static void retire_playback_urb(struct snd_usb_substream
*subs
,
1572 unsigned long flags
;
1573 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1574 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1575 int processed
= urb
->transfer_buffer_length
/ ep
->stride
;
1578 /* ignore the delay accounting when procssed=0 is given, i.e.
1579 * silent payloads are procssed before handling the actual data
1584 spin_lock_irqsave(&subs
->lock
, flags
);
1585 if (!subs
->last_delay
)
1586 goto out
; /* short path */
1588 est_delay
= snd_usb_pcm_delay(subs
, runtime
->rate
);
1589 /* update delay with exact number of samples played */
1590 if (processed
> subs
->last_delay
)
1591 subs
->last_delay
= 0;
1593 subs
->last_delay
-= processed
;
1594 runtime
->delay
= subs
->last_delay
;
1597 * Report when delay estimate is off by more than 2ms.
1598 * The error should be lower than 2ms since the estimate relies
1599 * on two reads of a counter updated every ms.
1601 if (abs(est_delay
- subs
->last_delay
) * 1000 > runtime
->rate
* 2)
1602 dev_dbg_ratelimited(&subs
->dev
->dev
,
1603 "delay: estimated %d, actual %d\n",
1604 est_delay
, subs
->last_delay
);
1606 if (!subs
->running
) {
1607 /* update last_frame_number for delay counting here since
1608 * prepare_playback_urb won't be called during pause
1610 subs
->last_frame_number
=
1611 usb_get_current_frame_number(subs
->dev
) & 0xff;
1615 spin_unlock_irqrestore(&subs
->lock
, flags
);
1618 static int snd_usb_playback_open(struct snd_pcm_substream
*substream
)
1620 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1623 static int snd_usb_playback_close(struct snd_pcm_substream
*substream
)
1625 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1628 static int snd_usb_capture_open(struct snd_pcm_substream
*substream
)
1630 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1633 static int snd_usb_capture_close(struct snd_pcm_substream
*substream
)
1635 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1638 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream
*substream
,
1641 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1644 case SNDRV_PCM_TRIGGER_START
:
1645 subs
->trigger_tstamp_pending_update
= true;
1646 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1647 subs
->data_endpoint
->prepare_data_urb
= prepare_playback_urb
;
1648 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1651 case SNDRV_PCM_TRIGGER_STOP
:
1652 stop_endpoints(subs
, false);
1655 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1656 subs
->data_endpoint
->prepare_data_urb
= NULL
;
1657 /* keep retire_data_urb for delay calculation */
1658 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1666 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream
*substream
,
1670 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1673 case SNDRV_PCM_TRIGGER_START
:
1674 err
= start_endpoints(subs
, false);
1678 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1681 case SNDRV_PCM_TRIGGER_STOP
:
1682 stop_endpoints(subs
, false);
1685 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1686 subs
->data_endpoint
->retire_data_urb
= NULL
;
1689 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1690 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1698 static struct snd_pcm_ops snd_usb_playback_ops
= {
1699 .open
= snd_usb_playback_open
,
1700 .close
= snd_usb_playback_close
,
1701 .ioctl
= snd_pcm_lib_ioctl
,
1702 .hw_params
= snd_usb_hw_params
,
1703 .hw_free
= snd_usb_hw_free
,
1704 .prepare
= snd_usb_pcm_prepare
,
1705 .trigger
= snd_usb_substream_playback_trigger
,
1706 .pointer
= snd_usb_pcm_pointer
,
1707 .page
= snd_pcm_lib_get_vmalloc_page
,
1708 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1711 static struct snd_pcm_ops snd_usb_capture_ops
= {
1712 .open
= snd_usb_capture_open
,
1713 .close
= snd_usb_capture_close
,
1714 .ioctl
= snd_pcm_lib_ioctl
,
1715 .hw_params
= snd_usb_hw_params
,
1716 .hw_free
= snd_usb_hw_free
,
1717 .prepare
= snd_usb_pcm_prepare
,
1718 .trigger
= snd_usb_substream_capture_trigger
,
1719 .pointer
= snd_usb_pcm_pointer
,
1720 .page
= snd_pcm_lib_get_vmalloc_page
,
1721 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1724 void snd_usb_set_pcm_ops(struct snd_pcm
*pcm
, int stream
)
1726 snd_pcm_set_ops(pcm
, stream
,
1727 stream
== SNDRV_PCM_STREAM_PLAYBACK
?
1728 &snd_usb_playback_ops
: &snd_usb_capture_ops
);