1 // SPDX-License-Identifier: GPL-2.0-or-later
5 #include <linux/init.h>
6 #include <linux/slab.h>
7 #include <linux/bitrev.h>
8 #include <linux/ratelimit.h>
10 #include <linux/usb/audio.h>
11 #include <linux/usb/audio-v2.h>
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
31 /* return the estimated delay based on USB frame counters */
32 snd_pcm_uframes_t
snd_usb_pcm_delay(struct snd_usb_substream
*subs
,
35 int current_frame_number
;
39 if (!subs
->last_delay
)
40 return 0; /* short path */
42 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
44 * HCD implementations use different widths, use lower 8 bits.
45 * The delay will be managed up to 256ms, which is more than
48 frame_diff
= (current_frame_number
- subs
->last_frame_number
) & 0xff;
50 /* Approximation based on number of samples per USB frame (ms),
51 some truncation for 44.1 but the estimate is good enough */
52 est_delay
= frame_diff
* rate
/ 1000;
53 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
54 est_delay
= subs
->last_delay
- est_delay
;
56 est_delay
= subs
->last_delay
+ est_delay
;
64 * return the current pcm pointer. just based on the hwptr_done value.
66 static snd_pcm_uframes_t
snd_usb_pcm_pointer(struct snd_pcm_substream
*substream
)
68 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
69 unsigned int hwptr_done
;
71 if (atomic_read(&subs
->stream
->chip
->shutdown
))
72 return SNDRV_PCM_POS_XRUN
;
73 spin_lock(&subs
->lock
);
74 hwptr_done
= subs
->hwptr_done
;
75 substream
->runtime
->delay
= snd_usb_pcm_delay(subs
,
76 substream
->runtime
->rate
);
77 spin_unlock(&subs
->lock
);
78 return hwptr_done
/ (substream
->runtime
->frame_bits
>> 3);
82 * find a matching audio format
84 static const struct audioformat
*
85 find_format(struct list_head
*fmt_list_head
, snd_pcm_format_t format
,
86 unsigned int rate
, unsigned int channels
, bool strict_match
,
87 struct snd_usb_substream
*subs
)
89 const struct audioformat
*fp
;
90 const struct audioformat
*found
= NULL
;
91 int cur_attr
= 0, attr
;
93 list_for_each_entry(fp
, fmt_list_head
, list
) {
95 if (!(fp
->formats
& pcm_format_to_bits(format
)))
97 if (fp
->channels
!= channels
)
100 if (rate
< fp
->rate_min
|| rate
> fp
->rate_max
)
102 if (!(fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)) {
104 for (i
= 0; i
< fp
->nr_rates
; i
++)
105 if (fp
->rate_table
[i
] == rate
)
107 if (i
>= fp
->nr_rates
)
110 attr
= fp
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
116 /* avoid async out and adaptive in if the other method
117 * supports the same format.
118 * this is a workaround for the case like
119 * M-audio audiophile USB.
121 if (subs
&& attr
!= cur_attr
) {
122 if ((attr
== USB_ENDPOINT_SYNC_ASYNC
&&
123 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
124 (attr
== USB_ENDPOINT_SYNC_ADAPTIVE
&&
125 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
))
127 if ((cur_attr
== USB_ENDPOINT_SYNC_ASYNC
&&
128 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
129 (cur_attr
== USB_ENDPOINT_SYNC_ADAPTIVE
&&
130 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
)) {
136 /* find the format with the largest max. packet size */
137 if (fp
->maxpacksize
> found
->maxpacksize
) {
145 static const struct audioformat
*
146 find_substream_format(struct snd_usb_substream
*subs
,
147 const struct snd_pcm_hw_params
*params
)
149 return find_format(&subs
->fmt_list
, params_format(params
),
150 params_rate(params
), params_channels(params
),
154 static int init_pitch_v1(struct snd_usb_audio
*chip
, int ep
)
156 struct usb_device
*dev
= chip
->dev
;
157 unsigned char data
[1];
161 err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC_SET_CUR
,
162 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_OUT
,
163 UAC_EP_CS_ATTR_PITCH_CONTROL
<< 8, ep
,
168 static int init_pitch_v2(struct snd_usb_audio
*chip
, int ep
)
170 struct usb_device
*dev
= chip
->dev
;
171 unsigned char data
[1];
175 err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC2_CS_CUR
,
176 USB_TYPE_CLASS
| USB_RECIP_ENDPOINT
| USB_DIR_OUT
,
177 UAC2_EP_CS_PITCH
<< 8, 0,
183 * initialize the pitch control and sample rate
185 int snd_usb_init_pitch(struct snd_usb_audio
*chip
,
186 const struct audioformat
*fmt
)
190 /* if endpoint doesn't have pitch control, bail out */
191 if (!(fmt
->attributes
& UAC_EP_CS_ATTR_PITCH_CONTROL
))
194 usb_audio_dbg(chip
, "enable PITCH for EP 0x%x\n", fmt
->endpoint
);
196 switch (fmt
->protocol
) {
198 err
= init_pitch_v1(chip
, fmt
->endpoint
);
201 err
= init_pitch_v2(chip
, fmt
->endpoint
);
208 usb_audio_err(chip
, "failed to enable PITCH for EP 0x%x\n",
216 static bool stop_endpoints(struct snd_usb_substream
*subs
)
220 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
)) {
221 snd_usb_endpoint_stop(subs
->sync_endpoint
);
224 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
)) {
225 snd_usb_endpoint_stop(subs
->data_endpoint
);
231 static int start_endpoints(struct snd_usb_substream
*subs
)
235 if (!subs
->data_endpoint
)
238 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
)) {
239 err
= snd_usb_endpoint_start(subs
->data_endpoint
);
241 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
);
246 if (subs
->sync_endpoint
&&
247 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
)) {
248 err
= snd_usb_endpoint_start(subs
->sync_endpoint
);
250 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
);
258 stop_endpoints(subs
);
262 static void sync_pending_stops(struct snd_usb_substream
*subs
)
264 snd_usb_endpoint_sync_pending_stop(subs
->sync_endpoint
);
265 snd_usb_endpoint_sync_pending_stop(subs
->data_endpoint
);
268 /* PCM sync_stop callback */
269 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream
*substream
)
271 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
273 sync_pending_stops(subs
);
277 /* Set up sync endpoint */
278 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio
*chip
,
279 struct audioformat
*fmt
)
281 struct usb_device
*dev
= chip
->dev
;
282 struct usb_host_interface
*alts
;
283 struct usb_interface_descriptor
*altsd
;
284 unsigned int ep
, attr
, sync_attr
;
288 alts
= snd_usb_get_host_interface(chip
, fmt
->iface
, fmt
->altsetting
);
291 altsd
= get_iface_desc(alts
);
293 err
= snd_usb_parse_implicit_fb_quirk(chip
, fmt
, alts
);
295 return 0; /* matched */
298 * Generic sync EP handling
301 if (altsd
->bNumEndpoints
< 2)
304 is_playback
= !(get_endpoint(alts
, 0)->bEndpointAddress
& USB_DIR_IN
);
305 attr
= fmt
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
306 if ((is_playback
&& (attr
== USB_ENDPOINT_SYNC_SYNC
||
307 attr
== USB_ENDPOINT_SYNC_ADAPTIVE
)) ||
308 (!is_playback
&& attr
!= USB_ENDPOINT_SYNC_ADAPTIVE
))
311 sync_attr
= get_endpoint(alts
, 1)->bmAttributes
;
314 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
315 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
316 * error fall back to SYNC mode and don't create sync endpoint
319 /* check sync-pipe endpoint */
320 /* ... and check descriptor size before accessing bSynchAddress
321 because there is a version of the SB Audigy 2 NX firmware lacking
322 the audio fields in the endpoint descriptors */
323 if ((sync_attr
& USB_ENDPOINT_XFERTYPE_MASK
) != USB_ENDPOINT_XFER_ISOC
||
324 (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
325 get_endpoint(alts
, 1)->bSynchAddress
!= 0)) {
327 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
328 fmt
->iface
, fmt
->altsetting
,
329 get_endpoint(alts
, 1)->bmAttributes
,
330 get_endpoint(alts
, 1)->bLength
,
331 get_endpoint(alts
, 1)->bSynchAddress
);
332 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
336 ep
= get_endpoint(alts
, 1)->bEndpointAddress
;
337 if (get_endpoint(alts
, 0)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
338 get_endpoint(alts
, 0)->bSynchAddress
!= 0 &&
339 ((is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
| USB_DIR_IN
)) ||
340 (!is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
& ~USB_DIR_IN
)))) {
342 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
343 fmt
->iface
, fmt
->altsetting
,
344 is_playback
, ep
, get_endpoint(alts
, 0)->bSynchAddress
);
345 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
351 fmt
->sync_iface
= altsd
->bInterfaceNumber
;
352 fmt
->sync_altsetting
= altsd
->bAlternateSetting
;
353 fmt
->sync_ep_idx
= 1;
354 if ((sync_attr
& USB_ENDPOINT_USAGE_MASK
) == USB_ENDPOINT_USAGE_IMPLICIT_FB
)
355 fmt
->implicit_fb
= 1;
357 dev_dbg(&dev
->dev
, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
358 fmt
->iface
, fmt
->altsetting
, fmt
->sync_ep
, fmt
->sync_iface
,
359 fmt
->sync_altsetting
, fmt
->implicit_fb
);
364 static int snd_usb_pcm_change_state(struct snd_usb_substream
*subs
, int state
)
371 ret
= snd_usb_power_domain_set(subs
->stream
->chip
, subs
->str_pd
, state
);
373 dev_err(&subs
->dev
->dev
,
374 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
375 subs
->str_pd
->pd_id
, state
, ret
);
382 int snd_usb_pcm_suspend(struct snd_usb_stream
*as
)
386 ret
= snd_usb_pcm_change_state(&as
->substream
[0], UAC3_PD_STATE_D2
);
390 ret
= snd_usb_pcm_change_state(&as
->substream
[1], UAC3_PD_STATE_D2
);
397 int snd_usb_pcm_resume(struct snd_usb_stream
*as
)
401 ret
= snd_usb_pcm_change_state(&as
->substream
[0], UAC3_PD_STATE_D1
);
405 ret
= snd_usb_pcm_change_state(&as
->substream
[1], UAC3_PD_STATE_D1
);
412 static void close_endpoints(struct snd_usb_audio
*chip
,
413 struct snd_usb_substream
*subs
)
415 if (subs
->data_endpoint
) {
416 snd_usb_endpoint_set_sync(chip
, subs
->data_endpoint
, NULL
);
417 snd_usb_endpoint_close(chip
, subs
->data_endpoint
);
418 subs
->data_endpoint
= NULL
;
421 if (subs
->sync_endpoint
) {
422 snd_usb_endpoint_close(chip
, subs
->sync_endpoint
);
423 subs
->sync_endpoint
= NULL
;
427 static int configure_endpoints(struct snd_usb_audio
*chip
,
428 struct snd_usb_substream
*subs
)
432 if (subs
->data_endpoint
->need_setup
) {
433 /* stop any running stream beforehand */
434 if (stop_endpoints(subs
))
435 sync_pending_stops(subs
);
436 err
= snd_usb_endpoint_configure(chip
, subs
->data_endpoint
);
439 snd_usb_set_format_quirk(subs
, subs
->cur_audiofmt
);
442 if (subs
->sync_endpoint
) {
443 err
= snd_usb_endpoint_configure(chip
, subs
->sync_endpoint
);
454 * allocate a buffer and set the given audio format.
456 * so far we use a physically linear buffer although packetize transfer
457 * doesn't need a continuous area.
458 * if sg buffer is supported on the later version of alsa, we'll follow
461 static int snd_usb_hw_params(struct snd_pcm_substream
*substream
,
462 struct snd_pcm_hw_params
*hw_params
)
464 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
465 struct snd_usb_audio
*chip
= subs
->stream
->chip
;
466 const struct audioformat
*fmt
;
467 const struct audioformat
*sync_fmt
;
470 ret
= snd_media_start_pipeline(subs
);
474 fmt
= find_substream_format(subs
, hw_params
);
477 "cannot find format: format=%s, rate=%d, channels=%d\n",
478 snd_pcm_format_name(params_format(hw_params
)),
479 params_rate(hw_params
), params_channels(hw_params
));
484 if (fmt
->implicit_fb
) {
485 sync_fmt
= snd_usb_find_implicit_fb_sync_format(chip
, fmt
,
490 "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
491 fmt
->sync_ep
, fmt
->sync_iface
,
492 fmt
->sync_altsetting
,
493 snd_pcm_format_name(params_format(hw_params
)),
494 params_rate(hw_params
), params_channels(hw_params
));
502 ret
= snd_usb_lock_shutdown(chip
);
506 ret
= snd_usb_pcm_change_state(subs
, UAC3_PD_STATE_D0
);
510 if (subs
->data_endpoint
) {
511 if (snd_usb_endpoint_compatible(chip
, subs
->data_endpoint
,
514 close_endpoints(chip
, subs
);
517 subs
->data_endpoint
= snd_usb_endpoint_open(chip
, fmt
, hw_params
, false);
518 if (!subs
->data_endpoint
) {
524 subs
->sync_endpoint
= snd_usb_endpoint_open(chip
, sync_fmt
,
527 if (!subs
->sync_endpoint
) {
532 snd_usb_endpoint_set_sync(chip
, subs
->data_endpoint
,
533 subs
->sync_endpoint
);
536 mutex_lock(&chip
->mutex
);
537 subs
->cur_audiofmt
= fmt
;
538 mutex_unlock(&chip
->mutex
);
540 ret
= configure_endpoints(chip
, subs
);
544 close_endpoints(chip
, subs
);
546 snd_usb_unlock_shutdown(chip
);
549 snd_media_stop_pipeline(subs
);
557 * reset the audio format and release the buffer
559 static int snd_usb_hw_free(struct snd_pcm_substream
*substream
)
561 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
562 struct snd_usb_audio
*chip
= subs
->stream
->chip
;
564 snd_media_stop_pipeline(subs
);
565 mutex_lock(&chip
->mutex
);
566 subs
->cur_audiofmt
= NULL
;
567 mutex_unlock(&chip
->mutex
);
568 if (!snd_usb_lock_shutdown(chip
)) {
569 if (stop_endpoints(subs
))
570 sync_pending_stops(subs
);
571 close_endpoints(chip
, subs
);
572 snd_usb_unlock_shutdown(chip
);
581 * only a few subtle things...
583 static int snd_usb_pcm_prepare(struct snd_pcm_substream
*substream
)
585 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
586 struct snd_usb_substream
*subs
= runtime
->private_data
;
587 struct snd_usb_audio
*chip
= subs
->stream
->chip
;
590 ret
= snd_usb_lock_shutdown(chip
);
593 if (snd_BUG_ON(!subs
->data_endpoint
)) {
598 ret
= configure_endpoints(chip
, subs
);
602 /* reset the pointer */
603 subs
->hwptr_done
= 0;
604 subs
->transfer_done
= 0;
605 subs
->last_delay
= 0;
606 subs
->last_frame_number
= 0;
609 /* for playback, submit the URBs now; otherwise, the first hwptr_done
610 * updates for all URBs would happen at the same time when starting */
611 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
612 ret
= start_endpoints(subs
);
615 snd_usb_unlock_shutdown(chip
);
623 #ifdef HW_CONST_DEBUG
624 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
626 #define hwc_debug(fmt, args...) do { } while(0)
629 static const struct snd_pcm_hardware snd_usb_hardware
=
631 .info
= SNDRV_PCM_INFO_MMAP
|
632 SNDRV_PCM_INFO_MMAP_VALID
|
633 SNDRV_PCM_INFO_BATCH
|
634 SNDRV_PCM_INFO_INTERLEAVED
|
635 SNDRV_PCM_INFO_BLOCK_TRANSFER
|
636 SNDRV_PCM_INFO_PAUSE
,
639 .buffer_bytes_max
= 1024 * 1024,
640 .period_bytes_min
= 64,
641 .period_bytes_max
= 512 * 1024,
646 static int hw_check_valid_format(struct snd_usb_substream
*subs
,
647 struct snd_pcm_hw_params
*params
,
648 const struct audioformat
*fp
)
650 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
651 struct snd_interval
*ct
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
652 struct snd_mask
*fmts
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
653 struct snd_interval
*pt
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
654 struct snd_mask check_fmts
;
657 /* check the format */
658 snd_mask_none(&check_fmts
);
659 check_fmts
.bits
[0] = (u32
)fp
->formats
;
660 check_fmts
.bits
[1] = (u32
)(fp
->formats
>> 32);
661 snd_mask_intersect(&check_fmts
, fmts
);
662 if (snd_mask_empty(&check_fmts
)) {
663 hwc_debug(" > check: no supported format 0x%llx\n", fp
->formats
);
666 /* check the channels */
667 if (fp
->channels
< ct
->min
|| fp
->channels
> ct
->max
) {
668 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp
->channels
, ct
->min
, ct
->max
);
671 /* check the rate is within the range */
672 if (fp
->rate_min
> it
->max
|| (fp
->rate_min
== it
->max
&& it
->openmax
)) {
673 hwc_debug(" > check: rate_min %d > max %d\n", fp
->rate_min
, it
->max
);
676 if (fp
->rate_max
< it
->min
|| (fp
->rate_max
== it
->min
&& it
->openmin
)) {
677 hwc_debug(" > check: rate_max %d < min %d\n", fp
->rate_max
, it
->min
);
680 /* check whether the period time is >= the data packet interval */
681 if (subs
->speed
!= USB_SPEED_FULL
) {
682 ptime
= 125 * (1 << fp
->datainterval
);
683 if (ptime
> pt
->max
|| (ptime
== pt
->max
&& pt
->openmax
)) {
684 hwc_debug(" > check: ptime %u > max %u\n", ptime
, pt
->max
);
691 static int apply_hw_params_minmax(struct snd_interval
*it
, unsigned int rmin
,
697 hwc_debug(" --> get empty\n");
703 if (it
->min
< rmin
) {
708 if (it
->max
> rmax
) {
713 if (snd_interval_checkempty(it
)) {
717 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
721 static int hw_rule_rate(struct snd_pcm_hw_params
*params
,
722 struct snd_pcm_hw_rule
*rule
)
724 struct snd_usb_substream
*subs
= rule
->private;
725 const struct audioformat
*fp
;
726 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
727 unsigned int rmin
, rmax
, r
;
730 hwc_debug("hw_rule_rate: (%d,%d)\n", it
->min
, it
->max
);
733 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
734 if (!hw_check_valid_format(subs
, params
, fp
))
736 if (fp
->rate_table
&& fp
->nr_rates
) {
737 for (i
= 0; i
< fp
->nr_rates
; i
++) {
738 r
= fp
->rate_table
[i
];
739 if (!snd_interval_test(it
, r
))
745 rmin
= min(rmin
, fp
->rate_min
);
746 rmax
= max(rmax
, fp
->rate_max
);
750 return apply_hw_params_minmax(it
, rmin
, rmax
);
754 static int hw_rule_channels(struct snd_pcm_hw_params
*params
,
755 struct snd_pcm_hw_rule
*rule
)
757 struct snd_usb_substream
*subs
= rule
->private;
758 const struct audioformat
*fp
;
759 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
760 unsigned int rmin
, rmax
;
762 hwc_debug("hw_rule_channels: (%d,%d)\n", it
->min
, it
->max
);
765 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
766 if (!hw_check_valid_format(subs
, params
, fp
))
768 rmin
= min(rmin
, fp
->channels
);
769 rmax
= max(rmax
, fp
->channels
);
772 return apply_hw_params_minmax(it
, rmin
, rmax
);
775 static int apply_hw_params_format_bits(struct snd_mask
*fmt
, u64 fbits
)
780 oldbits
[0] = fmt
->bits
[0];
781 oldbits
[1] = fmt
->bits
[1];
782 fmt
->bits
[0] &= (u32
)fbits
;
783 fmt
->bits
[1] &= (u32
)(fbits
>> 32);
784 if (!fmt
->bits
[0] && !fmt
->bits
[1]) {
785 hwc_debug(" --> get empty\n");
788 changed
= (oldbits
[0] != fmt
->bits
[0] || oldbits
[1] != fmt
->bits
[1]);
789 hwc_debug(" --> %x:%x (changed = %d)\n", fmt
->bits
[0], fmt
->bits
[1], changed
);
793 static int hw_rule_format(struct snd_pcm_hw_params
*params
,
794 struct snd_pcm_hw_rule
*rule
)
796 struct snd_usb_substream
*subs
= rule
->private;
797 const struct audioformat
*fp
;
798 struct snd_mask
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
801 hwc_debug("hw_rule_format: %x:%x\n", fmt
->bits
[0], fmt
->bits
[1]);
803 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
804 if (!hw_check_valid_format(subs
, params
, fp
))
806 fbits
|= fp
->formats
;
808 return apply_hw_params_format_bits(fmt
, fbits
);
811 static int hw_rule_period_time(struct snd_pcm_hw_params
*params
,
812 struct snd_pcm_hw_rule
*rule
)
814 struct snd_usb_substream
*subs
= rule
->private;
815 const struct audioformat
*fp
;
816 struct snd_interval
*it
;
817 unsigned char min_datainterval
;
820 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
821 hwc_debug("hw_rule_period_time: (%u,%u)\n", it
->min
, it
->max
);
822 min_datainterval
= 0xff;
823 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
824 if (!hw_check_valid_format(subs
, params
, fp
))
826 min_datainterval
= min(min_datainterval
, fp
->datainterval
);
828 if (min_datainterval
== 0xff) {
829 hwc_debug(" --> get empty\n");
833 pmin
= 125 * (1 << min_datainterval
);
835 return apply_hw_params_minmax(it
, pmin
, UINT_MAX
);
838 /* get the EP or the sync EP for implicit fb when it's already set up */
839 static const struct snd_usb_endpoint
*
840 get_sync_ep_from_substream(struct snd_usb_substream
*subs
)
842 struct snd_usb_audio
*chip
= subs
->stream
->chip
;
843 const struct audioformat
*fp
;
844 const struct snd_usb_endpoint
*ep
;
846 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
847 ep
= snd_usb_get_endpoint(chip
, fp
->endpoint
);
848 if (ep
&& ep
->cur_audiofmt
) {
849 /* if EP is already opened solely for this substream,
850 * we still allow us to change the parameter; otherwise
851 * this substream has to follow the existing parameter
853 if (ep
->cur_audiofmt
!= subs
->cur_audiofmt
|| ep
->opened
> 1)
856 if (!fp
->implicit_fb
)
858 /* for the implicit fb, check the sync ep as well */
859 ep
= snd_usb_get_endpoint(chip
, fp
->sync_ep
);
860 if (ep
&& ep
->cur_audiofmt
)
866 /* additional hw constraints for implicit feedback mode */
867 static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params
*params
,
868 struct snd_pcm_hw_rule
*rule
)
870 struct snd_usb_substream
*subs
= rule
->private;
871 const struct snd_usb_endpoint
*ep
;
872 struct snd_mask
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
874 ep
= get_sync_ep_from_substream(subs
);
878 hwc_debug("applying %s\n", __func__
);
879 return apply_hw_params_format_bits(fmt
, pcm_format_to_bits(ep
->cur_format
));
882 static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params
*params
,
883 struct snd_pcm_hw_rule
*rule
)
885 struct snd_usb_substream
*subs
= rule
->private;
886 const struct snd_usb_endpoint
*ep
;
887 struct snd_interval
*it
;
889 ep
= get_sync_ep_from_substream(subs
);
893 hwc_debug("applying %s\n", __func__
);
894 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
895 return apply_hw_params_minmax(it
, ep
->cur_rate
, ep
->cur_rate
);
898 static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params
*params
,
899 struct snd_pcm_hw_rule
*rule
)
901 struct snd_usb_substream
*subs
= rule
->private;
902 const struct snd_usb_endpoint
*ep
;
903 struct snd_interval
*it
;
905 ep
= get_sync_ep_from_substream(subs
);
909 hwc_debug("applying %s\n", __func__
);
910 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_SIZE
);
911 return apply_hw_params_minmax(it
, ep
->cur_period_frames
,
912 ep
->cur_period_frames
);
915 static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params
*params
,
916 struct snd_pcm_hw_rule
*rule
)
918 struct snd_usb_substream
*subs
= rule
->private;
919 const struct snd_usb_endpoint
*ep
;
920 struct snd_interval
*it
;
922 ep
= get_sync_ep_from_substream(subs
);
926 hwc_debug("applying %s\n", __func__
);
927 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIODS
);
928 return apply_hw_params_minmax(it
, ep
->cur_buffer_periods
,
929 ep
->cur_buffer_periods
);
933 * set up the runtime hardware information.
936 static int setup_hw_info(struct snd_pcm_runtime
*runtime
, struct snd_usb_substream
*subs
)
938 const struct audioformat
*fp
;
939 unsigned int pt
, ptmin
;
940 int param_period_time_if_needed
= -1;
943 runtime
->hw
.formats
= subs
->formats
;
945 runtime
->hw
.rate_min
= 0x7fffffff;
946 runtime
->hw
.rate_max
= 0;
947 runtime
->hw
.channels_min
= 256;
948 runtime
->hw
.channels_max
= 0;
949 runtime
->hw
.rates
= 0;
951 /* check min/max rates and channels */
952 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
953 runtime
->hw
.rates
|= fp
->rates
;
954 if (runtime
->hw
.rate_min
> fp
->rate_min
)
955 runtime
->hw
.rate_min
= fp
->rate_min
;
956 if (runtime
->hw
.rate_max
< fp
->rate_max
)
957 runtime
->hw
.rate_max
= fp
->rate_max
;
958 if (runtime
->hw
.channels_min
> fp
->channels
)
959 runtime
->hw
.channels_min
= fp
->channels
;
960 if (runtime
->hw
.channels_max
< fp
->channels
)
961 runtime
->hw
.channels_max
= fp
->channels
;
962 if (fp
->fmt_type
== UAC_FORMAT_TYPE_II
&& fp
->frame_size
> 0) {
963 /* FIXME: there might be more than one audio formats... */
964 runtime
->hw
.period_bytes_min
= runtime
->hw
.period_bytes_max
=
967 pt
= 125 * (1 << fp
->datainterval
);
968 ptmin
= min(ptmin
, pt
);
971 param_period_time_if_needed
= SNDRV_PCM_HW_PARAM_PERIOD_TIME
;
972 if (subs
->speed
== USB_SPEED_FULL
)
973 /* full speed devices have fixed data packet interval */
976 /* if period time doesn't go below 1 ms, no rules needed */
977 param_period_time_if_needed
= -1;
979 err
= snd_pcm_hw_constraint_minmax(runtime
,
980 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
985 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
987 SNDRV_PCM_HW_PARAM_RATE
,
988 SNDRV_PCM_HW_PARAM_FORMAT
,
989 SNDRV_PCM_HW_PARAM_CHANNELS
,
990 param_period_time_if_needed
,
995 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
996 hw_rule_channels
, subs
,
997 SNDRV_PCM_HW_PARAM_CHANNELS
,
998 SNDRV_PCM_HW_PARAM_FORMAT
,
999 SNDRV_PCM_HW_PARAM_RATE
,
1000 param_period_time_if_needed
,
1004 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
1005 hw_rule_format
, subs
,
1006 SNDRV_PCM_HW_PARAM_FORMAT
,
1007 SNDRV_PCM_HW_PARAM_RATE
,
1008 SNDRV_PCM_HW_PARAM_CHANNELS
,
1009 param_period_time_if_needed
,
1013 if (param_period_time_if_needed
>= 0) {
1014 err
= snd_pcm_hw_rule_add(runtime
, 0,
1015 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1016 hw_rule_period_time
, subs
,
1017 SNDRV_PCM_HW_PARAM_FORMAT
,
1018 SNDRV_PCM_HW_PARAM_CHANNELS
,
1019 SNDRV_PCM_HW_PARAM_RATE
,
1025 /* additional hw constraints for implicit fb */
1026 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
1027 hw_rule_format_implicit_fb
, subs
,
1028 SNDRV_PCM_HW_PARAM_FORMAT
, -1);
1031 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1032 hw_rule_rate_implicit_fb
, subs
,
1033 SNDRV_PCM_HW_PARAM_RATE
, -1);
1036 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE
,
1037 hw_rule_period_size_implicit_fb
, subs
,
1038 SNDRV_PCM_HW_PARAM_PERIOD_SIZE
, -1);
1041 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_PERIODS
,
1042 hw_rule_periods_implicit_fb
, subs
,
1043 SNDRV_PCM_HW_PARAM_PERIODS
, -1);
1050 static int snd_usb_pcm_open(struct snd_pcm_substream
*substream
)
1052 int direction
= substream
->stream
;
1053 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1054 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1055 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1058 runtime
->hw
= snd_usb_hardware
;
1059 runtime
->private_data
= subs
;
1060 subs
->pcm_substream
= substream
;
1061 /* runtime PM is also done there */
1063 /* initialize DSD/DOP context */
1064 subs
->dsd_dop
.byte_idx
= 0;
1065 subs
->dsd_dop
.channel
= 0;
1066 subs
->dsd_dop
.marker
= 1;
1068 ret
= setup_hw_info(runtime
, subs
);
1071 ret
= snd_usb_autoresume(subs
->stream
->chip
);
1074 ret
= snd_media_stream_init(subs
, as
->pcm
, direction
);
1076 snd_usb_autosuspend(subs
->stream
->chip
);
1080 static int snd_usb_pcm_close(struct snd_pcm_substream
*substream
)
1082 int direction
= substream
->stream
;
1083 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1084 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1087 snd_media_stop_pipeline(subs
);
1089 if (!snd_usb_lock_shutdown(subs
->stream
->chip
)) {
1090 ret
= snd_usb_pcm_change_state(subs
, UAC3_PD_STATE_D1
);
1091 snd_usb_unlock_shutdown(subs
->stream
->chip
);
1096 subs
->pcm_substream
= NULL
;
1097 snd_usb_autosuspend(subs
->stream
->chip
);
1102 /* Since a URB can handle only a single linear buffer, we must use double
1103 * buffering when the data to be transferred overflows the buffer boundary.
1104 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1107 static void retire_capture_urb(struct snd_usb_substream
*subs
,
1110 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1111 unsigned int stride
, frames
, bytes
, oldptr
;
1112 int i
, period_elapsed
= 0;
1113 unsigned long flags
;
1115 int current_frame_number
;
1117 /* read frame number here, update pointer in critical section */
1118 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
1120 stride
= runtime
->frame_bits
>> 3;
1122 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1123 cp
= (unsigned char *)urb
->transfer_buffer
+ urb
->iso_frame_desc
[i
].offset
+ subs
->pkt_offset_adj
;
1124 if (urb
->iso_frame_desc
[i
].status
&& printk_ratelimit()) {
1125 dev_dbg(&subs
->dev
->dev
, "frame %d active: %d\n",
1126 i
, urb
->iso_frame_desc
[i
].status
);
1129 bytes
= urb
->iso_frame_desc
[i
].actual_length
;
1130 if (subs
->stream_offset_adj
> 0) {
1131 unsigned int adj
= min(subs
->stream_offset_adj
, bytes
);
1134 subs
->stream_offset_adj
-= adj
;
1136 frames
= bytes
/ stride
;
1137 if (!subs
->txfr_quirk
)
1138 bytes
= frames
* stride
;
1139 if (bytes
% (runtime
->sample_bits
>> 3) != 0) {
1140 int oldbytes
= bytes
;
1141 bytes
= frames
* stride
;
1142 dev_warn_ratelimited(&subs
->dev
->dev
,
1143 "Corrected urb data len. %d->%d\n",
1146 /* update the current pointer */
1147 spin_lock_irqsave(&subs
->lock
, flags
);
1148 oldptr
= subs
->hwptr_done
;
1149 subs
->hwptr_done
+= bytes
;
1150 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1151 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1152 frames
= (bytes
+ (oldptr
% stride
)) / stride
;
1153 subs
->transfer_done
+= frames
;
1154 if (subs
->transfer_done
>= runtime
->period_size
) {
1155 subs
->transfer_done
-= runtime
->period_size
;
1158 /* capture delay is by construction limited to one URB,
1161 runtime
->delay
= subs
->last_delay
= 0;
1163 /* realign last_frame_number */
1164 subs
->last_frame_number
= current_frame_number
;
1165 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1167 spin_unlock_irqrestore(&subs
->lock
, flags
);
1168 /* copy a data chunk */
1169 if (oldptr
+ bytes
> runtime
->buffer_size
* stride
) {
1170 unsigned int bytes1
=
1171 runtime
->buffer_size
* stride
- oldptr
;
1172 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes1
);
1173 memcpy(runtime
->dma_area
, cp
+ bytes1
, bytes
- bytes1
);
1175 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes
);
1180 snd_pcm_period_elapsed(subs
->pcm_substream
);
1183 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream
*subs
,
1184 struct urb
*urb
, unsigned int bytes
)
1186 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1187 unsigned int stride
= runtime
->frame_bits
>> 3;
1188 unsigned int dst_idx
= 0;
1189 unsigned int src_idx
= subs
->hwptr_done
;
1190 unsigned int wrap
= runtime
->buffer_size
* stride
;
1191 u8
*dst
= urb
->transfer_buffer
;
1192 u8
*src
= runtime
->dma_area
;
1193 u8 marker
[] = { 0x05, 0xfa };
1196 * The DSP DOP format defines a way to transport DSD samples over
1197 * normal PCM data endpoints. It requires stuffing of marker bytes
1198 * (0x05 and 0xfa, alternating per sample frame), and then expects
1199 * 2 additional bytes of actual payload. The whole frame is stored
1202 * Hence, for a stereo transport, the buffer layout looks like this,
1203 * where L refers to left channel samples and R to right.
1205 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1206 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1212 if (++subs
->dsd_dop
.byte_idx
== 3) {
1213 /* frame boundary? */
1214 dst
[dst_idx
++] = marker
[subs
->dsd_dop
.marker
];
1216 subs
->dsd_dop
.byte_idx
= 0;
1218 if (++subs
->dsd_dop
.channel
% runtime
->channels
== 0) {
1219 /* alternate the marker */
1220 subs
->dsd_dop
.marker
++;
1221 subs
->dsd_dop
.marker
%= ARRAY_SIZE(marker
);
1222 subs
->dsd_dop
.channel
= 0;
1225 /* stuff the DSD payload */
1226 int idx
= (src_idx
+ subs
->dsd_dop
.byte_idx
- 1) % wrap
;
1228 if (subs
->cur_audiofmt
->dsd_bitrev
)
1229 dst
[dst_idx
++] = bitrev8(src
[idx
]);
1231 dst
[dst_idx
++] = src
[idx
];
1236 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1237 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1240 static void copy_to_urb(struct snd_usb_substream
*subs
, struct urb
*urb
,
1241 int offset
, int stride
, unsigned int bytes
)
1243 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1245 if (subs
->hwptr_done
+ bytes
> runtime
->buffer_size
* stride
) {
1246 /* err, the transferred area goes over buffer boundary. */
1247 unsigned int bytes1
=
1248 runtime
->buffer_size
* stride
- subs
->hwptr_done
;
1249 memcpy(urb
->transfer_buffer
+ offset
,
1250 runtime
->dma_area
+ subs
->hwptr_done
, bytes1
);
1251 memcpy(urb
->transfer_buffer
+ offset
+ bytes1
,
1252 runtime
->dma_area
, bytes
- bytes1
);
1254 memcpy(urb
->transfer_buffer
+ offset
,
1255 runtime
->dma_area
+ subs
->hwptr_done
, bytes
);
1257 subs
->hwptr_done
+= bytes
;
1258 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1259 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1262 static unsigned int copy_to_urb_quirk(struct snd_usb_substream
*subs
,
1263 struct urb
*urb
, int stride
,
1266 __le32 packet_length
;
1269 /* Put __le32 length descriptor at start of each packet. */
1270 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1271 unsigned int length
= urb
->iso_frame_desc
[i
].length
;
1272 unsigned int offset
= urb
->iso_frame_desc
[i
].offset
;
1274 packet_length
= cpu_to_le32(length
);
1275 offset
+= i
* sizeof(packet_length
);
1276 urb
->iso_frame_desc
[i
].offset
= offset
;
1277 urb
->iso_frame_desc
[i
].length
+= sizeof(packet_length
);
1278 memcpy(urb
->transfer_buffer
+ offset
,
1279 &packet_length
, sizeof(packet_length
));
1280 copy_to_urb(subs
, urb
, offset
+ sizeof(packet_length
),
1283 /* Adjust transfer size accordingly. */
1284 bytes
+= urb
->number_of_packets
* sizeof(packet_length
);
1288 static void prepare_playback_urb(struct snd_usb_substream
*subs
,
1291 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1292 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1293 struct snd_urb_ctx
*ctx
= urb
->context
;
1294 unsigned int counts
, frames
, bytes
;
1295 int i
, stride
, period_elapsed
= 0;
1296 unsigned long flags
;
1298 stride
= runtime
->frame_bits
>> 3;
1301 urb
->number_of_packets
= 0;
1302 spin_lock_irqsave(&subs
->lock
, flags
);
1303 subs
->frame_limit
+= ep
->max_urb_frames
;
1304 for (i
= 0; i
< ctx
->packets
; i
++) {
1305 counts
= snd_usb_endpoint_next_packet_size(ep
, ctx
, i
);
1306 /* set up descriptor */
1307 urb
->iso_frame_desc
[i
].offset
= frames
* ep
->stride
;
1308 urb
->iso_frame_desc
[i
].length
= counts
* ep
->stride
;
1310 urb
->number_of_packets
++;
1311 subs
->transfer_done
+= counts
;
1312 if (subs
->transfer_done
>= runtime
->period_size
) {
1313 subs
->transfer_done
-= runtime
->period_size
;
1314 subs
->frame_limit
= 0;
1316 if (subs
->fmt_type
== UAC_FORMAT_TYPE_II
) {
1317 if (subs
->transfer_done
> 0) {
1318 /* FIXME: fill-max mode is not
1320 frames
-= subs
->transfer_done
;
1321 counts
-= subs
->transfer_done
;
1322 urb
->iso_frame_desc
[i
].length
=
1323 counts
* ep
->stride
;
1324 subs
->transfer_done
= 0;
1327 if (i
< ctx
->packets
) {
1328 /* add a transfer delimiter */
1329 urb
->iso_frame_desc
[i
].offset
=
1330 frames
* ep
->stride
;
1331 urb
->iso_frame_desc
[i
].length
= 0;
1332 urb
->number_of_packets
++;
1337 /* finish at the period boundary or after enough frames */
1338 if ((period_elapsed
||
1339 subs
->transfer_done
>= subs
->frame_limit
) &&
1340 !snd_usb_endpoint_implicit_feedback_sink(ep
))
1343 bytes
= frames
* ep
->stride
;
1345 if (unlikely(ep
->cur_format
== SNDRV_PCM_FORMAT_DSD_U16_LE
&&
1346 subs
->cur_audiofmt
->dsd_dop
)) {
1347 fill_playback_urb_dsd_dop(subs
, urb
, bytes
);
1348 } else if (unlikely(ep
->cur_format
== SNDRV_PCM_FORMAT_DSD_U8
&&
1349 subs
->cur_audiofmt
->dsd_bitrev
)) {
1350 /* bit-reverse the bytes */
1351 u8
*buf
= urb
->transfer_buffer
;
1352 for (i
= 0; i
< bytes
; i
++) {
1353 int idx
= (subs
->hwptr_done
+ i
)
1354 % (runtime
->buffer_size
* stride
);
1355 buf
[i
] = bitrev8(runtime
->dma_area
[idx
]);
1358 subs
->hwptr_done
+= bytes
;
1359 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1360 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1363 if (!subs
->tx_length_quirk
)
1364 copy_to_urb(subs
, urb
, 0, stride
, bytes
);
1366 bytes
= copy_to_urb_quirk(subs
, urb
, stride
, bytes
);
1367 /* bytes is now amount of outgoing data */
1370 /* update delay with exact number of samples queued */
1371 runtime
->delay
= subs
->last_delay
;
1372 runtime
->delay
+= frames
;
1373 subs
->last_delay
= runtime
->delay
;
1375 /* realign last_frame_number */
1376 subs
->last_frame_number
= usb_get_current_frame_number(subs
->dev
);
1377 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1379 if (subs
->trigger_tstamp_pending_update
) {
1380 /* this is the first actual URB submitted,
1381 * update trigger timestamp to reflect actual start time
1383 snd_pcm_gettime(runtime
, &runtime
->trigger_tstamp
);
1384 subs
->trigger_tstamp_pending_update
= false;
1387 spin_unlock_irqrestore(&subs
->lock
, flags
);
1388 urb
->transfer_buffer_length
= bytes
;
1390 snd_pcm_period_elapsed(subs
->pcm_substream
);
1394 * process after playback data complete
1395 * - decrease the delay count again
1397 static void retire_playback_urb(struct snd_usb_substream
*subs
,
1400 unsigned long flags
;
1401 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1402 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1403 int processed
= urb
->transfer_buffer_length
/ ep
->stride
;
1406 /* ignore the delay accounting when processed=0 is given, i.e.
1407 * silent payloads are processed before handling the actual data
1412 spin_lock_irqsave(&subs
->lock
, flags
);
1413 if (!subs
->last_delay
)
1414 goto out
; /* short path */
1416 est_delay
= snd_usb_pcm_delay(subs
, runtime
->rate
);
1417 /* update delay with exact number of samples played */
1418 if (processed
> subs
->last_delay
)
1419 subs
->last_delay
= 0;
1421 subs
->last_delay
-= processed
;
1422 runtime
->delay
= subs
->last_delay
;
1425 * Report when delay estimate is off by more than 2ms.
1426 * The error should be lower than 2ms since the estimate relies
1427 * on two reads of a counter updated every ms.
1429 if (abs(est_delay
- subs
->last_delay
) * 1000 > runtime
->rate
* 2)
1430 dev_dbg_ratelimited(&subs
->dev
->dev
,
1431 "delay: estimated %d, actual %d\n",
1432 est_delay
, subs
->last_delay
);
1434 if (!subs
->running
) {
1435 /* update last_frame_number for delay counting here since
1436 * prepare_playback_urb won't be called during pause
1438 subs
->last_frame_number
=
1439 usb_get_current_frame_number(subs
->dev
) & 0xff;
1443 spin_unlock_irqrestore(&subs
->lock
, flags
);
1446 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream
*substream
,
1449 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1452 case SNDRV_PCM_TRIGGER_START
:
1453 subs
->trigger_tstamp_pending_update
= true;
1455 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1456 snd_usb_endpoint_set_callback(subs
->data_endpoint
,
1457 prepare_playback_urb
,
1458 retire_playback_urb
,
1461 dev_dbg(&subs
->dev
->dev
, "%d:%d Start Playback PCM\n",
1462 subs
->cur_audiofmt
->iface
,
1463 subs
->cur_audiofmt
->altsetting
);
1465 case SNDRV_PCM_TRIGGER_SUSPEND
:
1466 case SNDRV_PCM_TRIGGER_STOP
:
1467 stop_endpoints(subs
);
1468 snd_usb_endpoint_set_callback(subs
->data_endpoint
,
1471 dev_dbg(&subs
->dev
->dev
, "%d:%d Stop Playback PCM\n",
1472 subs
->cur_audiofmt
->iface
,
1473 subs
->cur_audiofmt
->altsetting
);
1475 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1476 /* keep retire_data_urb for delay calculation */
1477 snd_usb_endpoint_set_callback(subs
->data_endpoint
,
1479 retire_playback_urb
,
1482 dev_dbg(&subs
->dev
->dev
, "%d:%d Pause Playback PCM\n",
1483 subs
->cur_audiofmt
->iface
,
1484 subs
->cur_audiofmt
->altsetting
);
1491 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream
*substream
,
1495 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1498 case SNDRV_PCM_TRIGGER_START
:
1499 err
= start_endpoints(subs
);
1503 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1504 snd_usb_endpoint_set_callback(subs
->data_endpoint
,
1505 NULL
, retire_capture_urb
,
1508 dev_dbg(&subs
->dev
->dev
, "%d:%d Start Capture PCM\n",
1509 subs
->cur_audiofmt
->iface
,
1510 subs
->cur_audiofmt
->altsetting
);
1512 case SNDRV_PCM_TRIGGER_SUSPEND
:
1513 case SNDRV_PCM_TRIGGER_STOP
:
1514 stop_endpoints(subs
);
1516 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1517 snd_usb_endpoint_set_callback(subs
->data_endpoint
,
1520 dev_dbg(&subs
->dev
->dev
, "%d:%d Stop Capture PCM\n",
1521 subs
->cur_audiofmt
->iface
,
1522 subs
->cur_audiofmt
->altsetting
);
1529 static const struct snd_pcm_ops snd_usb_playback_ops
= {
1530 .open
= snd_usb_pcm_open
,
1531 .close
= snd_usb_pcm_close
,
1532 .hw_params
= snd_usb_hw_params
,
1533 .hw_free
= snd_usb_hw_free
,
1534 .prepare
= snd_usb_pcm_prepare
,
1535 .trigger
= snd_usb_substream_playback_trigger
,
1536 .sync_stop
= snd_usb_pcm_sync_stop
,
1537 .pointer
= snd_usb_pcm_pointer
,
1540 static const struct snd_pcm_ops snd_usb_capture_ops
= {
1541 .open
= snd_usb_pcm_open
,
1542 .close
= snd_usb_pcm_close
,
1543 .hw_params
= snd_usb_hw_params
,
1544 .hw_free
= snd_usb_hw_free
,
1545 .prepare
= snd_usb_pcm_prepare
,
1546 .trigger
= snd_usb_substream_capture_trigger
,
1547 .sync_stop
= snd_usb_pcm_sync_stop
,
1548 .pointer
= snd_usb_pcm_pointer
,
1551 void snd_usb_set_pcm_ops(struct snd_pcm
*pcm
, int stream
)
1553 const struct snd_pcm_ops
*ops
;
1555 ops
= stream
== SNDRV_PCM_STREAM_PLAYBACK
?
1556 &snd_usb_playback_ops
: &snd_usb_capture_ops
;
1557 snd_pcm_set_ops(pcm
, stream
, ops
);
1560 void snd_usb_preallocate_buffer(struct snd_usb_substream
*subs
)
1562 struct snd_pcm
*pcm
= subs
->stream
->pcm
;
1563 struct snd_pcm_substream
*s
= pcm
->streams
[subs
->direction
].substream
;
1564 struct device
*dev
= subs
->dev
->bus
->sysdev
;
1566 if (snd_usb_use_vmalloc
)
1567 snd_pcm_set_managed_buffer(s
, SNDRV_DMA_TYPE_VMALLOC
,
1570 snd_pcm_set_managed_buffer(s
, SNDRV_DMA_TYPE_DEV_SG
,
1571 dev
, 64*1024, 512*1024);