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 if (get_iface_desc(alts
)->bNumEndpoints
< 1)
165 ep
= get_endpoint(alts
, 0)->bEndpointAddress
;
168 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC_SET_CUR
,
169 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_OUT
,
170 UAC_EP_CS_ATTR_PITCH_CONTROL
<< 8, ep
,
171 data
, sizeof(data
))) < 0) {
172 usb_audio_err(chip
, "%d:%d: cannot set enable PITCH\n",
180 static int init_pitch_v2(struct snd_usb_audio
*chip
, int iface
,
181 struct usb_host_interface
*alts
,
182 struct audioformat
*fmt
)
184 struct usb_device
*dev
= chip
->dev
;
185 unsigned char data
[1];
189 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC2_CS_CUR
,
190 USB_TYPE_CLASS
| USB_RECIP_ENDPOINT
| USB_DIR_OUT
,
191 UAC2_EP_CS_PITCH
<< 8, 0,
192 data
, sizeof(data
))) < 0) {
193 usb_audio_err(chip
, "%d:%d: cannot set enable PITCH (v2)\n",
194 iface
, fmt
->altsetting
);
202 * initialize the pitch control and sample rate
204 int snd_usb_init_pitch(struct snd_usb_audio
*chip
, int iface
,
205 struct usb_host_interface
*alts
,
206 struct audioformat
*fmt
)
208 /* if endpoint doesn't have pitch control, bail out */
209 if (!(fmt
->attributes
& UAC_EP_CS_ATTR_PITCH_CONTROL
))
212 switch (fmt
->protocol
) {
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 dev_dbg(&subs
->dev
->dev
, "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
->altsetting
!= subs
->sync_endpoint
->altsetting
) {
248 err
= usb_set_interface(subs
->dev
,
249 subs
->sync_endpoint
->iface
,
250 subs
->sync_endpoint
->altsetting
);
252 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
);
253 dev_err(&subs
->dev
->dev
,
254 "%d:%d: cannot set interface (%d)\n",
255 subs
->sync_endpoint
->iface
,
256 subs
->sync_endpoint
->altsetting
, err
);
261 dev_dbg(&subs
->dev
->dev
, "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 search_roland_implicit_fb(struct usb_device
*dev
, int ifnum
,
289 unsigned int altsetting
,
290 struct usb_host_interface
**alts
,
293 struct usb_interface
*iface
;
294 struct usb_interface_descriptor
*altsd
;
295 struct usb_endpoint_descriptor
*epd
;
297 iface
= usb_ifnum_to_if(dev
, ifnum
);
298 if (!iface
|| iface
->num_altsetting
< altsetting
+ 1)
300 *alts
= &iface
->altsetting
[altsetting
];
301 altsd
= get_iface_desc(*alts
);
302 if (altsd
->bAlternateSetting
!= altsetting
||
303 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
||
304 (altsd
->bInterfaceSubClass
!= 2 &&
305 altsd
->bInterfaceProtocol
!= 2 ) ||
306 altsd
->bNumEndpoints
< 1)
308 epd
= get_endpoint(*alts
, 0);
309 if (!usb_endpoint_is_isoc_in(epd
) ||
310 (epd
->bmAttributes
& USB_ENDPOINT_USAGE_MASK
) !=
311 USB_ENDPOINT_USAGE_IMPLICIT_FB
)
313 *ep
= epd
->bEndpointAddress
;
317 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream
*subs
,
318 struct usb_device
*dev
,
319 struct usb_interface_descriptor
*altsd
,
322 struct usb_host_interface
*alts
;
323 struct usb_interface
*iface
;
326 /* Implicit feedback sync EPs consumers are always playback EPs */
327 if (subs
->direction
!= SNDRV_PCM_STREAM_PLAYBACK
)
330 switch (subs
->stream
->chip
->usb_id
) {
331 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
332 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
334 iface
= usb_ifnum_to_if(dev
, 3);
336 if (!iface
|| iface
->num_altsetting
== 0)
339 alts
= &iface
->altsetting
[1];
342 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
343 case USB_ID(0x0763, 0x2081):
345 iface
= usb_ifnum_to_if(dev
, 2);
347 if (!iface
|| iface
->num_altsetting
== 0)
350 alts
= &iface
->altsetting
[1];
353 if (attr
== USB_ENDPOINT_SYNC_ASYNC
&&
354 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
&&
355 altsd
->bInterfaceProtocol
== 2 &&
356 altsd
->bNumEndpoints
== 1 &&
357 USB_ID_VENDOR(subs
->stream
->chip
->usb_id
) == 0x0582 /* Roland */ &&
358 search_roland_implicit_fb(dev
, altsd
->bInterfaceNumber
+ 1,
359 altsd
->bAlternateSetting
,
368 subs
->sync_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
369 alts
, ep
, !subs
->direction
,
370 SND_USB_ENDPOINT_TYPE_DATA
);
371 if (!subs
->sync_endpoint
)
374 subs
->data_endpoint
->sync_master
= subs
->sync_endpoint
;
379 static int set_sync_endpoint(struct snd_usb_substream
*subs
,
380 struct audioformat
*fmt
,
381 struct usb_device
*dev
,
382 struct usb_host_interface
*alts
,
383 struct usb_interface_descriptor
*altsd
)
385 int is_playback
= subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
;
386 unsigned int ep
, attr
;
390 /* we need a sync pipe in async OUT or adaptive IN mode */
391 /* check the number of EP, since some devices have broken
392 * descriptors which fool us. if it has only one EP,
393 * assume it as adaptive-out or sync-in.
395 attr
= fmt
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
397 if ((is_playback
&& (attr
!= USB_ENDPOINT_SYNC_ASYNC
)) ||
398 (!is_playback
&& (attr
!= USB_ENDPOINT_SYNC_ADAPTIVE
))) {
401 * In these modes the notion of sync_endpoint is irrelevant.
402 * Reset pointers to avoid using stale data from previously
403 * used settings, e.g. when configuration and endpoints were
407 subs
->sync_endpoint
= NULL
;
408 subs
->data_endpoint
->sync_master
= NULL
;
411 err
= set_sync_ep_implicit_fb_quirk(subs
, dev
, altsd
, attr
);
415 if (altsd
->bNumEndpoints
< 2)
418 if ((is_playback
&& (attr
== USB_ENDPOINT_SYNC_SYNC
||
419 attr
== USB_ENDPOINT_SYNC_ADAPTIVE
)) ||
420 (!is_playback
&& attr
!= USB_ENDPOINT_SYNC_ADAPTIVE
))
424 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
425 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
426 * error fall back to SYNC mode and don't create sync endpoint
429 /* check sync-pipe endpoint */
430 /* ... and check descriptor size before accessing bSynchAddress
431 because there is a version of the SB Audigy 2 NX firmware lacking
432 the audio fields in the endpoint descriptors */
433 if ((get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) != USB_ENDPOINT_XFER_ISOC
||
434 (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
435 get_endpoint(alts
, 1)->bSynchAddress
!= 0)) {
437 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
438 fmt
->iface
, fmt
->altsetting
,
439 get_endpoint(alts
, 1)->bmAttributes
,
440 get_endpoint(alts
, 1)->bLength
,
441 get_endpoint(alts
, 1)->bSynchAddress
);
442 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
446 ep
= get_endpoint(alts
, 1)->bEndpointAddress
;
447 if (get_endpoint(alts
, 0)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
448 ((is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
| USB_DIR_IN
)) ||
449 (!is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
& ~USB_DIR_IN
)))) {
451 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
452 fmt
->iface
, fmt
->altsetting
,
453 is_playback
, ep
, get_endpoint(alts
, 0)->bSynchAddress
);
454 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
459 implicit_fb
= (get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_USAGE_MASK
)
460 == USB_ENDPOINT_USAGE_IMPLICIT_FB
;
462 subs
->sync_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
463 alts
, ep
, !subs
->direction
,
465 SND_USB_ENDPOINT_TYPE_DATA
:
466 SND_USB_ENDPOINT_TYPE_SYNC
);
467 if (!subs
->sync_endpoint
) {
468 if (is_playback
&& attr
== USB_ENDPOINT_SYNC_NONE
)
473 subs
->data_endpoint
->sync_master
= subs
->sync_endpoint
;
479 * find a matching format and set up the interface
481 static int set_format(struct snd_usb_substream
*subs
, struct audioformat
*fmt
)
483 struct usb_device
*dev
= subs
->dev
;
484 struct usb_host_interface
*alts
;
485 struct usb_interface_descriptor
*altsd
;
486 struct usb_interface
*iface
;
489 iface
= usb_ifnum_to_if(dev
, fmt
->iface
);
492 alts
= &iface
->altsetting
[fmt
->altset_idx
];
493 altsd
= get_iface_desc(alts
);
494 if (WARN_ON(altsd
->bAlternateSetting
!= fmt
->altsetting
))
497 if (fmt
== subs
->cur_audiofmt
)
500 /* close the old interface */
501 if (subs
->interface
>= 0 && subs
->interface
!= fmt
->iface
) {
502 err
= usb_set_interface(subs
->dev
, subs
->interface
, 0);
505 "%d:%d: return to setting 0 failed (%d)\n",
506 fmt
->iface
, fmt
->altsetting
, err
);
509 subs
->interface
= -1;
510 subs
->altset_idx
= 0;
514 if (subs
->interface
!= fmt
->iface
||
515 subs
->altset_idx
!= fmt
->altset_idx
) {
517 err
= snd_usb_select_mode_quirk(subs
, fmt
);
521 err
= usb_set_interface(dev
, fmt
->iface
, fmt
->altsetting
);
524 "%d:%d: usb_set_interface failed (%d)\n",
525 fmt
->iface
, fmt
->altsetting
, err
);
528 dev_dbg(&dev
->dev
, "setting usb interface %d:%d\n",
529 fmt
->iface
, fmt
->altsetting
);
530 subs
->interface
= fmt
->iface
;
531 subs
->altset_idx
= fmt
->altset_idx
;
533 snd_usb_set_interface_quirk(dev
);
536 subs
->data_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
537 alts
, fmt
->endpoint
, subs
->direction
,
538 SND_USB_ENDPOINT_TYPE_DATA
);
540 if (!subs
->data_endpoint
)
543 err
= set_sync_endpoint(subs
, fmt
, dev
, alts
, altsd
);
547 err
= snd_usb_init_pitch(subs
->stream
->chip
, fmt
->iface
, alts
, fmt
);
551 subs
->cur_audiofmt
= fmt
;
553 snd_usb_set_format_quirk(subs
, fmt
);
559 * Return the score of matching two audioformats.
560 * Veto the audioformat if:
561 * - It has no channels for some reason.
562 * - Requested PCM format is not supported.
563 * - Requested sample rate is not supported.
565 static int match_endpoint_audioformats(struct snd_usb_substream
*subs
,
566 struct audioformat
*fp
,
567 struct audioformat
*match
, int rate
,
568 snd_pcm_format_t pcm_format
)
573 if (fp
->channels
< 1) {
574 dev_dbg(&subs
->dev
->dev
,
575 "%s: (fmt @%p) no channels\n", __func__
, fp
);
579 if (!(fp
->formats
& pcm_format_to_bits(pcm_format
))) {
580 dev_dbg(&subs
->dev
->dev
,
581 "%s: (fmt @%p) no match for format %d\n", __func__
,
586 for (i
= 0; i
< fp
->nr_rates
; i
++) {
587 if (fp
->rate_table
[i
] == rate
) {
593 dev_dbg(&subs
->dev
->dev
,
594 "%s: (fmt @%p) no match for rate %d\n", __func__
,
599 if (fp
->channels
== match
->channels
)
602 dev_dbg(&subs
->dev
->dev
,
603 "%s: (fmt @%p) score %d\n", __func__
, fp
, score
);
609 * Configure the sync ep using the rate and pcm format of the data ep.
611 static int configure_sync_endpoint(struct snd_usb_substream
*subs
)
614 struct audioformat
*fp
;
615 struct audioformat
*sync_fp
= NULL
;
617 int sync_period_bytes
= subs
->period_bytes
;
618 struct snd_usb_substream
*sync_subs
=
619 &subs
->stream
->substream
[subs
->direction
^ 1];
621 if (subs
->sync_endpoint
->type
!= SND_USB_ENDPOINT_TYPE_DATA
||
623 return snd_usb_endpoint_set_params(subs
->sync_endpoint
,
632 /* Try to find the best matching audioformat. */
633 list_for_each_entry(fp
, &sync_subs
->fmt_list
, list
) {
634 int score
= match_endpoint_audioformats(subs
,
635 fp
, subs
->cur_audiofmt
,
636 subs
->cur_rate
, subs
->pcm_format
);
638 if (score
> cur_score
) {
644 if (unlikely(sync_fp
== NULL
)) {
645 dev_err(&subs
->dev
->dev
,
646 "%s: no valid audioformat for sync ep %x found\n",
647 __func__
, sync_subs
->ep_num
);
652 * Recalculate the period bytes if channel number differ between
653 * data and sync ep audioformat.
655 if (sync_fp
->channels
!= subs
->channels
) {
656 sync_period_bytes
= (subs
->period_bytes
/ subs
->channels
) *
658 dev_dbg(&subs
->dev
->dev
,
659 "%s: adjusted sync ep period bytes (%d -> %d)\n",
660 __func__
, subs
->period_bytes
, sync_period_bytes
);
663 ret
= snd_usb_endpoint_set_params(subs
->sync_endpoint
,
676 * configure endpoint params
678 * called during initial setup and upon resume
680 static int configure_endpoint(struct snd_usb_substream
*subs
)
685 stop_endpoints(subs
, true);
686 ret
= snd_usb_endpoint_set_params(subs
->data_endpoint
,
691 subs
->buffer_periods
,
694 subs
->sync_endpoint
);
698 if (subs
->sync_endpoint
)
699 ret
= configure_sync_endpoint(subs
);
707 * allocate a buffer and set the given audio format.
709 * so far we use a physically linear buffer although packetize transfer
710 * doesn't need a continuous area.
711 * if sg buffer is supported on the later version of alsa, we'll follow
714 static int snd_usb_hw_params(struct snd_pcm_substream
*substream
,
715 struct snd_pcm_hw_params
*hw_params
)
717 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
718 struct audioformat
*fmt
;
721 ret
= media_snd_start_pipeline(subs
);
725 ret
= snd_pcm_lib_alloc_vmalloc_buffer(substream
,
726 params_buffer_bytes(hw_params
));
730 subs
->pcm_format
= params_format(hw_params
);
731 subs
->period_bytes
= params_period_bytes(hw_params
);
732 subs
->period_frames
= params_period_size(hw_params
);
733 subs
->buffer_periods
= params_periods(hw_params
);
734 subs
->channels
= params_channels(hw_params
);
735 subs
->cur_rate
= params_rate(hw_params
);
737 fmt
= find_format(subs
);
739 dev_dbg(&subs
->dev
->dev
,
740 "cannot set format: format = %#x, rate = %d, channels = %d\n",
741 subs
->pcm_format
, subs
->cur_rate
, subs
->channels
);
746 ret
= snd_usb_lock_shutdown(subs
->stream
->chip
);
749 ret
= set_format(subs
, fmt
);
750 snd_usb_unlock_shutdown(subs
->stream
->chip
);
754 subs
->interface
= fmt
->iface
;
755 subs
->altset_idx
= fmt
->altset_idx
;
756 subs
->need_setup_ep
= true;
761 media_snd_stop_pipeline(subs
);
768 * reset the audio format and release the buffer
770 static int snd_usb_hw_free(struct snd_pcm_substream
*substream
)
772 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
774 media_snd_stop_pipeline(subs
);
775 subs
->cur_audiofmt
= NULL
;
777 subs
->period_bytes
= 0;
778 if (!snd_usb_lock_shutdown(subs
->stream
->chip
)) {
779 stop_endpoints(subs
, true);
780 snd_usb_endpoint_deactivate(subs
->sync_endpoint
);
781 snd_usb_endpoint_deactivate(subs
->data_endpoint
);
782 snd_usb_unlock_shutdown(subs
->stream
->chip
);
784 return snd_pcm_lib_free_vmalloc_buffer(substream
);
790 * only a few subtle things...
792 static int snd_usb_pcm_prepare(struct snd_pcm_substream
*substream
)
794 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
795 struct snd_usb_substream
*subs
= runtime
->private_data
;
796 struct usb_host_interface
*alts
;
797 struct usb_interface
*iface
;
800 if (! subs
->cur_audiofmt
) {
801 dev_err(&subs
->dev
->dev
, "no format is specified!\n");
805 ret
= snd_usb_lock_shutdown(subs
->stream
->chip
);
808 if (snd_BUG_ON(!subs
->data_endpoint
)) {
813 snd_usb_endpoint_sync_pending_stop(subs
->sync_endpoint
);
814 snd_usb_endpoint_sync_pending_stop(subs
->data_endpoint
);
816 ret
= set_format(subs
, subs
->cur_audiofmt
);
820 iface
= usb_ifnum_to_if(subs
->dev
, subs
->cur_audiofmt
->iface
);
821 alts
= &iface
->altsetting
[subs
->cur_audiofmt
->altset_idx
];
822 ret
= snd_usb_init_sample_rate(subs
->stream
->chip
,
823 subs
->cur_audiofmt
->iface
,
830 if (subs
->need_setup_ep
) {
831 ret
= configure_endpoint(subs
);
834 subs
->need_setup_ep
= false;
837 /* some unit conversions in runtime */
838 subs
->data_endpoint
->maxframesize
=
839 bytes_to_frames(runtime
, subs
->data_endpoint
->maxpacksize
);
840 subs
->data_endpoint
->curframesize
=
841 bytes_to_frames(runtime
, subs
->data_endpoint
->curpacksize
);
843 /* reset the pointer */
844 subs
->hwptr_done
= 0;
845 subs
->transfer_done
= 0;
846 subs
->last_delay
= 0;
847 subs
->last_frame_number
= 0;
850 /* for playback, submit the URBs now; otherwise, the first hwptr_done
851 * updates for all URBs would happen at the same time when starting */
852 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
853 ret
= start_endpoints(subs
, true);
856 snd_usb_unlock_shutdown(subs
->stream
->chip
);
860 static struct snd_pcm_hardware snd_usb_hardware
=
862 .info
= SNDRV_PCM_INFO_MMAP
|
863 SNDRV_PCM_INFO_MMAP_VALID
|
864 SNDRV_PCM_INFO_BATCH
|
865 SNDRV_PCM_INFO_INTERLEAVED
|
866 SNDRV_PCM_INFO_BLOCK_TRANSFER
|
867 SNDRV_PCM_INFO_PAUSE
,
868 .buffer_bytes_max
= 1024 * 1024,
869 .period_bytes_min
= 64,
870 .period_bytes_max
= 512 * 1024,
875 static int hw_check_valid_format(struct snd_usb_substream
*subs
,
876 struct snd_pcm_hw_params
*params
,
877 struct audioformat
*fp
)
879 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
880 struct snd_interval
*ct
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
881 struct snd_mask
*fmts
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
882 struct snd_interval
*pt
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
883 struct snd_mask check_fmts
;
886 /* check the format */
887 snd_mask_none(&check_fmts
);
888 check_fmts
.bits
[0] = (u32
)fp
->formats
;
889 check_fmts
.bits
[1] = (u32
)(fp
->formats
>> 32);
890 snd_mask_intersect(&check_fmts
, fmts
);
891 if (snd_mask_empty(&check_fmts
)) {
892 hwc_debug(" > check: no supported format %d\n", fp
->format
);
895 /* check the channels */
896 if (fp
->channels
< ct
->min
|| fp
->channels
> ct
->max
) {
897 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp
->channels
, ct
->min
, ct
->max
);
900 /* check the rate is within the range */
901 if (fp
->rate_min
> it
->max
|| (fp
->rate_min
== it
->max
&& it
->openmax
)) {
902 hwc_debug(" > check: rate_min %d > max %d\n", fp
->rate_min
, it
->max
);
905 if (fp
->rate_max
< it
->min
|| (fp
->rate_max
== it
->min
&& it
->openmin
)) {
906 hwc_debug(" > check: rate_max %d < min %d\n", fp
->rate_max
, it
->min
);
909 /* check whether the period time is >= the data packet interval */
910 if (subs
->speed
!= USB_SPEED_FULL
) {
911 ptime
= 125 * (1 << fp
->datainterval
);
912 if (ptime
> pt
->max
|| (ptime
== pt
->max
&& pt
->openmax
)) {
913 hwc_debug(" > check: ptime %u > max %u\n", ptime
, pt
->max
);
920 static int hw_rule_rate(struct snd_pcm_hw_params
*params
,
921 struct snd_pcm_hw_rule
*rule
)
923 struct snd_usb_substream
*subs
= rule
->private;
924 struct audioformat
*fp
;
925 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
926 unsigned int rmin
, rmax
;
929 hwc_debug("hw_rule_rate: (%d,%d)\n", it
->min
, it
->max
);
932 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
933 if (!hw_check_valid_format(subs
, params
, fp
))
936 if (rmin
> fp
->rate_min
)
938 if (rmax
< fp
->rate_max
)
947 hwc_debug(" --> get empty\n");
953 if (it
->min
< rmin
) {
958 if (it
->max
> rmax
) {
963 if (snd_interval_checkempty(it
)) {
967 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
972 static int hw_rule_channels(struct snd_pcm_hw_params
*params
,
973 struct snd_pcm_hw_rule
*rule
)
975 struct snd_usb_substream
*subs
= rule
->private;
976 struct audioformat
*fp
;
977 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
978 unsigned int rmin
, rmax
;
981 hwc_debug("hw_rule_channels: (%d,%d)\n", it
->min
, it
->max
);
984 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
985 if (!hw_check_valid_format(subs
, params
, fp
))
988 if (rmin
> fp
->channels
)
990 if (rmax
< fp
->channels
)
999 hwc_debug(" --> get empty\n");
1005 if (it
->min
< rmin
) {
1010 if (it
->max
> rmax
) {
1015 if (snd_interval_checkempty(it
)) {
1019 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
1023 static int hw_rule_format(struct snd_pcm_hw_params
*params
,
1024 struct snd_pcm_hw_rule
*rule
)
1026 struct snd_usb_substream
*subs
= rule
->private;
1027 struct audioformat
*fp
;
1028 struct snd_mask
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
1033 hwc_debug("hw_rule_format: %x:%x\n", fmt
->bits
[0], fmt
->bits
[1]);
1035 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1036 if (!hw_check_valid_format(subs
, params
, fp
))
1038 fbits
|= fp
->formats
;
1041 oldbits
[0] = fmt
->bits
[0];
1042 oldbits
[1] = fmt
->bits
[1];
1043 fmt
->bits
[0] &= (u32
)fbits
;
1044 fmt
->bits
[1] &= (u32
)(fbits
>> 32);
1045 if (!fmt
->bits
[0] && !fmt
->bits
[1]) {
1046 hwc_debug(" --> get empty\n");
1049 changed
= (oldbits
[0] != fmt
->bits
[0] || oldbits
[1] != fmt
->bits
[1]);
1050 hwc_debug(" --> %x:%x (changed = %d)\n", fmt
->bits
[0], fmt
->bits
[1], changed
);
1054 static int hw_rule_period_time(struct snd_pcm_hw_params
*params
,
1055 struct snd_pcm_hw_rule
*rule
)
1057 struct snd_usb_substream
*subs
= rule
->private;
1058 struct audioformat
*fp
;
1059 struct snd_interval
*it
;
1060 unsigned char min_datainterval
;
1064 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
1065 hwc_debug("hw_rule_period_time: (%u,%u)\n", it
->min
, it
->max
);
1066 min_datainterval
= 0xff;
1067 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1068 if (!hw_check_valid_format(subs
, params
, fp
))
1070 min_datainterval
= min(min_datainterval
, fp
->datainterval
);
1072 if (min_datainterval
== 0xff) {
1073 hwc_debug(" --> get empty\n");
1077 pmin
= 125 * (1 << min_datainterval
);
1079 if (it
->min
< pmin
) {
1084 if (snd_interval_checkempty(it
)) {
1088 hwc_debug(" --> (%u,%u) (changed = %d)\n", it
->min
, it
->max
, changed
);
1093 * If the device supports unusual bit rates, does the request meet these?
1095 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime
*runtime
,
1096 struct snd_usb_substream
*subs
)
1098 struct audioformat
*fp
;
1100 int count
= 0, needs_knot
= 0;
1103 kfree(subs
->rate_list
.list
);
1104 subs
->rate_list
.list
= NULL
;
1106 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1107 if (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)
1109 count
+= fp
->nr_rates
;
1110 if (fp
->rates
& SNDRV_PCM_RATE_KNOT
)
1116 subs
->rate_list
.list
= rate_list
=
1117 kmalloc(sizeof(int) * count
, GFP_KERNEL
);
1118 if (!subs
->rate_list
.list
)
1120 subs
->rate_list
.count
= count
;
1121 subs
->rate_list
.mask
= 0;
1123 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1125 for (i
= 0; i
< fp
->nr_rates
; i
++)
1126 rate_list
[count
++] = fp
->rate_table
[i
];
1128 err
= snd_pcm_hw_constraint_list(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1138 * set up the runtime hardware information.
1141 static int setup_hw_info(struct snd_pcm_runtime
*runtime
, struct snd_usb_substream
*subs
)
1143 struct audioformat
*fp
;
1144 unsigned int pt
, ptmin
;
1145 int param_period_time_if_needed
;
1148 runtime
->hw
.formats
= subs
->formats
;
1150 runtime
->hw
.rate_min
= 0x7fffffff;
1151 runtime
->hw
.rate_max
= 0;
1152 runtime
->hw
.channels_min
= 256;
1153 runtime
->hw
.channels_max
= 0;
1154 runtime
->hw
.rates
= 0;
1156 /* check min/max rates and channels */
1157 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
1158 runtime
->hw
.rates
|= fp
->rates
;
1159 if (runtime
->hw
.rate_min
> fp
->rate_min
)
1160 runtime
->hw
.rate_min
= fp
->rate_min
;
1161 if (runtime
->hw
.rate_max
< fp
->rate_max
)
1162 runtime
->hw
.rate_max
= fp
->rate_max
;
1163 if (runtime
->hw
.channels_min
> fp
->channels
)
1164 runtime
->hw
.channels_min
= fp
->channels
;
1165 if (runtime
->hw
.channels_max
< fp
->channels
)
1166 runtime
->hw
.channels_max
= fp
->channels
;
1167 if (fp
->fmt_type
== UAC_FORMAT_TYPE_II
&& fp
->frame_size
> 0) {
1168 /* FIXME: there might be more than one audio formats... */
1169 runtime
->hw
.period_bytes_min
= runtime
->hw
.period_bytes_max
=
1172 pt
= 125 * (1 << fp
->datainterval
);
1173 ptmin
= min(ptmin
, pt
);
1175 err
= snd_usb_autoresume(subs
->stream
->chip
);
1179 param_period_time_if_needed
= SNDRV_PCM_HW_PARAM_PERIOD_TIME
;
1180 if (subs
->speed
== USB_SPEED_FULL
)
1181 /* full speed devices have fixed data packet interval */
1184 /* if period time doesn't go below 1 ms, no rules needed */
1185 param_period_time_if_needed
= -1;
1186 snd_pcm_hw_constraint_minmax(runtime
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1189 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1191 SNDRV_PCM_HW_PARAM_FORMAT
,
1192 SNDRV_PCM_HW_PARAM_CHANNELS
,
1193 param_period_time_if_needed
,
1196 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
1197 hw_rule_channels
, subs
,
1198 SNDRV_PCM_HW_PARAM_FORMAT
,
1199 SNDRV_PCM_HW_PARAM_RATE
,
1200 param_period_time_if_needed
,
1203 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
1204 hw_rule_format
, subs
,
1205 SNDRV_PCM_HW_PARAM_RATE
,
1206 SNDRV_PCM_HW_PARAM_CHANNELS
,
1207 param_period_time_if_needed
,
1210 if (param_period_time_if_needed
>= 0) {
1211 err
= snd_pcm_hw_rule_add(runtime
, 0,
1212 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1213 hw_rule_period_time
, subs
,
1214 SNDRV_PCM_HW_PARAM_FORMAT
,
1215 SNDRV_PCM_HW_PARAM_CHANNELS
,
1216 SNDRV_PCM_HW_PARAM_RATE
,
1221 if ((err
= snd_usb_pcm_check_knot(runtime
, subs
)) < 0)
1226 snd_usb_autosuspend(subs
->stream
->chip
);
1230 static int snd_usb_pcm_open(struct snd_pcm_substream
*substream
, int direction
)
1232 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1233 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1234 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1237 subs
->interface
= -1;
1238 subs
->altset_idx
= 0;
1239 runtime
->hw
= snd_usb_hardware
;
1240 runtime
->private_data
= subs
;
1241 subs
->pcm_substream
= substream
;
1242 /* runtime PM is also done there */
1244 /* initialize DSD/DOP context */
1245 subs
->dsd_dop
.byte_idx
= 0;
1246 subs
->dsd_dop
.channel
= 0;
1247 subs
->dsd_dop
.marker
= 1;
1249 ret
= setup_hw_info(runtime
, subs
);
1251 ret
= media_snd_stream_init(subs
, as
->pcm
, direction
);
1253 snd_usb_autosuspend(subs
->stream
->chip
);
1257 static int snd_usb_pcm_close(struct snd_pcm_substream
*substream
, int direction
)
1259 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
1260 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
1262 stop_endpoints(subs
, true);
1263 media_snd_stop_pipeline(subs
);
1265 if (subs
->interface
>= 0 &&
1266 !snd_usb_lock_shutdown(subs
->stream
->chip
)) {
1267 usb_set_interface(subs
->dev
, subs
->interface
, 0);
1268 subs
->interface
= -1;
1269 snd_usb_unlock_shutdown(subs
->stream
->chip
);
1272 subs
->pcm_substream
= NULL
;
1273 snd_usb_autosuspend(subs
->stream
->chip
);
1278 /* Since a URB can handle only a single linear buffer, we must use double
1279 * buffering when the data to be transferred overflows the buffer boundary.
1280 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1283 static void retire_capture_urb(struct snd_usb_substream
*subs
,
1286 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1287 unsigned int stride
, frames
, bytes
, oldptr
;
1288 int i
, period_elapsed
= 0;
1289 unsigned long flags
;
1291 int current_frame_number
;
1293 /* read frame number here, update pointer in critical section */
1294 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
1296 stride
= runtime
->frame_bits
>> 3;
1298 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1299 cp
= (unsigned char *)urb
->transfer_buffer
+ urb
->iso_frame_desc
[i
].offset
+ subs
->pkt_offset_adj
;
1300 if (urb
->iso_frame_desc
[i
].status
&& printk_ratelimit()) {
1301 dev_dbg(&subs
->dev
->dev
, "frame %d active: %d\n",
1302 i
, urb
->iso_frame_desc
[i
].status
);
1305 bytes
= urb
->iso_frame_desc
[i
].actual_length
;
1306 frames
= bytes
/ stride
;
1307 if (!subs
->txfr_quirk
)
1308 bytes
= frames
* stride
;
1309 if (bytes
% (runtime
->sample_bits
>> 3) != 0) {
1310 int oldbytes
= bytes
;
1311 bytes
= frames
* stride
;
1312 dev_warn(&subs
->dev
->dev
,
1313 "Corrected urb data len. %d->%d\n",
1316 /* update the current pointer */
1317 spin_lock_irqsave(&subs
->lock
, flags
);
1318 oldptr
= subs
->hwptr_done
;
1319 subs
->hwptr_done
+= bytes
;
1320 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1321 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1322 frames
= (bytes
+ (oldptr
% stride
)) / stride
;
1323 subs
->transfer_done
+= frames
;
1324 if (subs
->transfer_done
>= runtime
->period_size
) {
1325 subs
->transfer_done
-= runtime
->period_size
;
1328 /* capture delay is by construction limited to one URB,
1331 runtime
->delay
= subs
->last_delay
= 0;
1333 /* realign last_frame_number */
1334 subs
->last_frame_number
= current_frame_number
;
1335 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1337 spin_unlock_irqrestore(&subs
->lock
, flags
);
1338 /* copy a data chunk */
1339 if (oldptr
+ bytes
> runtime
->buffer_size
* stride
) {
1340 unsigned int bytes1
=
1341 runtime
->buffer_size
* stride
- oldptr
;
1342 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes1
);
1343 memcpy(runtime
->dma_area
, cp
+ bytes1
, bytes
- bytes1
);
1345 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes
);
1350 snd_pcm_period_elapsed(subs
->pcm_substream
);
1353 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream
*subs
,
1354 struct urb
*urb
, unsigned int bytes
)
1356 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1357 unsigned int stride
= runtime
->frame_bits
>> 3;
1358 unsigned int dst_idx
= 0;
1359 unsigned int src_idx
= subs
->hwptr_done
;
1360 unsigned int wrap
= runtime
->buffer_size
* stride
;
1361 u8
*dst
= urb
->transfer_buffer
;
1362 u8
*src
= runtime
->dma_area
;
1363 u8 marker
[] = { 0x05, 0xfa };
1366 * The DSP DOP format defines a way to transport DSD samples over
1367 * normal PCM data endpoints. It requires stuffing of marker bytes
1368 * (0x05 and 0xfa, alternating per sample frame), and then expects
1369 * 2 additional bytes of actual payload. The whole frame is stored
1372 * Hence, for a stereo transport, the buffer layout looks like this,
1373 * where L refers to left channel samples and R to right.
1375 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1376 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1382 if (++subs
->dsd_dop
.byte_idx
== 3) {
1383 /* frame boundary? */
1384 dst
[dst_idx
++] = marker
[subs
->dsd_dop
.marker
];
1386 subs
->dsd_dop
.byte_idx
= 0;
1388 if (++subs
->dsd_dop
.channel
% runtime
->channels
== 0) {
1389 /* alternate the marker */
1390 subs
->dsd_dop
.marker
++;
1391 subs
->dsd_dop
.marker
%= ARRAY_SIZE(marker
);
1392 subs
->dsd_dop
.channel
= 0;
1395 /* stuff the DSD payload */
1396 int idx
= (src_idx
+ subs
->dsd_dop
.byte_idx
- 1) % wrap
;
1398 if (subs
->cur_audiofmt
->dsd_bitrev
)
1399 dst
[dst_idx
++] = bitrev8(src
[idx
]);
1401 dst
[dst_idx
++] = src
[idx
];
1406 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1407 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1410 static void copy_to_urb(struct snd_usb_substream
*subs
, struct urb
*urb
,
1411 int offset
, int stride
, unsigned int bytes
)
1413 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1415 if (subs
->hwptr_done
+ bytes
> runtime
->buffer_size
* stride
) {
1416 /* err, the transferred area goes over buffer boundary. */
1417 unsigned int bytes1
=
1418 runtime
->buffer_size
* stride
- subs
->hwptr_done
;
1419 memcpy(urb
->transfer_buffer
+ offset
,
1420 runtime
->dma_area
+ subs
->hwptr_done
, bytes1
);
1421 memcpy(urb
->transfer_buffer
+ offset
+ bytes1
,
1422 runtime
->dma_area
, bytes
- bytes1
);
1424 memcpy(urb
->transfer_buffer
+ offset
,
1425 runtime
->dma_area
+ subs
->hwptr_done
, bytes
);
1427 subs
->hwptr_done
+= bytes
;
1428 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1429 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1432 static unsigned int copy_to_urb_quirk(struct snd_usb_substream
*subs
,
1433 struct urb
*urb
, int stride
,
1436 __le32 packet_length
;
1439 /* Put __le32 length descriptor at start of each packet. */
1440 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1441 unsigned int length
= urb
->iso_frame_desc
[i
].length
;
1442 unsigned int offset
= urb
->iso_frame_desc
[i
].offset
;
1444 packet_length
= cpu_to_le32(length
);
1445 offset
+= i
* sizeof(packet_length
);
1446 urb
->iso_frame_desc
[i
].offset
= offset
;
1447 urb
->iso_frame_desc
[i
].length
+= sizeof(packet_length
);
1448 memcpy(urb
->transfer_buffer
+ offset
,
1449 &packet_length
, sizeof(packet_length
));
1450 copy_to_urb(subs
, urb
, offset
+ sizeof(packet_length
),
1453 /* Adjust transfer size accordingly. */
1454 bytes
+= urb
->number_of_packets
* sizeof(packet_length
);
1458 static void prepare_playback_urb(struct snd_usb_substream
*subs
,
1461 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1462 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1463 struct snd_urb_ctx
*ctx
= urb
->context
;
1464 unsigned int counts
, frames
, bytes
;
1465 int i
, stride
, period_elapsed
= 0;
1466 unsigned long flags
;
1468 stride
= runtime
->frame_bits
>> 3;
1471 urb
->number_of_packets
= 0;
1472 spin_lock_irqsave(&subs
->lock
, flags
);
1473 subs
->frame_limit
+= ep
->max_urb_frames
;
1474 for (i
= 0; i
< ctx
->packets
; i
++) {
1475 if (ctx
->packet_size
[i
])
1476 counts
= ctx
->packet_size
[i
];
1478 counts
= snd_usb_endpoint_next_packet_size(ep
);
1480 /* set up descriptor */
1481 urb
->iso_frame_desc
[i
].offset
= frames
* ep
->stride
;
1482 urb
->iso_frame_desc
[i
].length
= counts
* ep
->stride
;
1484 urb
->number_of_packets
++;
1485 subs
->transfer_done
+= counts
;
1486 if (subs
->transfer_done
>= runtime
->period_size
) {
1487 subs
->transfer_done
-= runtime
->period_size
;
1488 subs
->frame_limit
= 0;
1490 if (subs
->fmt_type
== UAC_FORMAT_TYPE_II
) {
1491 if (subs
->transfer_done
> 0) {
1492 /* FIXME: fill-max mode is not
1494 frames
-= subs
->transfer_done
;
1495 counts
-= subs
->transfer_done
;
1496 urb
->iso_frame_desc
[i
].length
=
1497 counts
* ep
->stride
;
1498 subs
->transfer_done
= 0;
1501 if (i
< ctx
->packets
) {
1502 /* add a transfer delimiter */
1503 urb
->iso_frame_desc
[i
].offset
=
1504 frames
* ep
->stride
;
1505 urb
->iso_frame_desc
[i
].length
= 0;
1506 urb
->number_of_packets
++;
1511 /* finish at the period boundary or after enough frames */
1512 if ((period_elapsed
||
1513 subs
->transfer_done
>= subs
->frame_limit
) &&
1514 !snd_usb_endpoint_implicit_feedback_sink(ep
))
1517 bytes
= frames
* ep
->stride
;
1519 if (unlikely(subs
->pcm_format
== SNDRV_PCM_FORMAT_DSD_U16_LE
&&
1520 subs
->cur_audiofmt
->dsd_dop
)) {
1521 fill_playback_urb_dsd_dop(subs
, urb
, bytes
);
1522 } else if (unlikely(subs
->pcm_format
== SNDRV_PCM_FORMAT_DSD_U8
&&
1523 subs
->cur_audiofmt
->dsd_bitrev
)) {
1524 /* bit-reverse the bytes */
1525 u8
*buf
= urb
->transfer_buffer
;
1526 for (i
= 0; i
< bytes
; i
++) {
1527 int idx
= (subs
->hwptr_done
+ i
)
1528 % (runtime
->buffer_size
* stride
);
1529 buf
[i
] = bitrev8(runtime
->dma_area
[idx
]);
1532 subs
->hwptr_done
+= bytes
;
1533 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1534 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1537 if (!subs
->tx_length_quirk
)
1538 copy_to_urb(subs
, urb
, 0, stride
, bytes
);
1540 bytes
= copy_to_urb_quirk(subs
, urb
, stride
, bytes
);
1541 /* bytes is now amount of outgoing data */
1544 /* update delay with exact number of samples queued */
1545 runtime
->delay
= subs
->last_delay
;
1546 runtime
->delay
+= frames
;
1547 subs
->last_delay
= runtime
->delay
;
1549 /* realign last_frame_number */
1550 subs
->last_frame_number
= usb_get_current_frame_number(subs
->dev
);
1551 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1553 if (subs
->trigger_tstamp_pending_update
) {
1554 /* this is the first actual URB submitted,
1555 * update trigger timestamp to reflect actual start time
1557 snd_pcm_gettime(runtime
, &runtime
->trigger_tstamp
);
1558 subs
->trigger_tstamp_pending_update
= false;
1561 spin_unlock_irqrestore(&subs
->lock
, flags
);
1562 urb
->transfer_buffer_length
= bytes
;
1564 snd_pcm_period_elapsed(subs
->pcm_substream
);
1568 * process after playback data complete
1569 * - decrease the delay count again
1571 static void retire_playback_urb(struct snd_usb_substream
*subs
,
1574 unsigned long flags
;
1575 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1576 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1577 int processed
= urb
->transfer_buffer_length
/ ep
->stride
;
1580 /* ignore the delay accounting when procssed=0 is given, i.e.
1581 * silent payloads are procssed before handling the actual data
1586 spin_lock_irqsave(&subs
->lock
, flags
);
1587 if (!subs
->last_delay
)
1588 goto out
; /* short path */
1590 est_delay
= snd_usb_pcm_delay(subs
, runtime
->rate
);
1591 /* update delay with exact number of samples played */
1592 if (processed
> subs
->last_delay
)
1593 subs
->last_delay
= 0;
1595 subs
->last_delay
-= processed
;
1596 runtime
->delay
= subs
->last_delay
;
1599 * Report when delay estimate is off by more than 2ms.
1600 * The error should be lower than 2ms since the estimate relies
1601 * on two reads of a counter updated every ms.
1603 if (abs(est_delay
- subs
->last_delay
) * 1000 > runtime
->rate
* 2)
1604 dev_dbg_ratelimited(&subs
->dev
->dev
,
1605 "delay: estimated %d, actual %d\n",
1606 est_delay
, subs
->last_delay
);
1608 if (!subs
->running
) {
1609 /* update last_frame_number for delay counting here since
1610 * prepare_playback_urb won't be called during pause
1612 subs
->last_frame_number
=
1613 usb_get_current_frame_number(subs
->dev
) & 0xff;
1617 spin_unlock_irqrestore(&subs
->lock
, flags
);
1620 static int snd_usb_playback_open(struct snd_pcm_substream
*substream
)
1622 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1625 static int snd_usb_playback_close(struct snd_pcm_substream
*substream
)
1627 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1630 static int snd_usb_capture_open(struct snd_pcm_substream
*substream
)
1632 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1635 static int snd_usb_capture_close(struct snd_pcm_substream
*substream
)
1637 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1640 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream
*substream
,
1643 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1646 case SNDRV_PCM_TRIGGER_START
:
1647 subs
->trigger_tstamp_pending_update
= true;
1648 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1649 subs
->data_endpoint
->prepare_data_urb
= prepare_playback_urb
;
1650 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1653 case SNDRV_PCM_TRIGGER_STOP
:
1654 stop_endpoints(subs
, false);
1657 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1658 subs
->data_endpoint
->prepare_data_urb
= NULL
;
1659 /* keep retire_data_urb for delay calculation */
1660 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1668 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream
*substream
,
1672 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1675 case SNDRV_PCM_TRIGGER_START
:
1676 err
= start_endpoints(subs
, false);
1680 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1683 case SNDRV_PCM_TRIGGER_STOP
:
1684 stop_endpoints(subs
, false);
1687 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1688 subs
->data_endpoint
->retire_data_urb
= NULL
;
1691 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1692 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1700 static struct snd_pcm_ops snd_usb_playback_ops
= {
1701 .open
= snd_usb_playback_open
,
1702 .close
= snd_usb_playback_close
,
1703 .ioctl
= snd_pcm_lib_ioctl
,
1704 .hw_params
= snd_usb_hw_params
,
1705 .hw_free
= snd_usb_hw_free
,
1706 .prepare
= snd_usb_pcm_prepare
,
1707 .trigger
= snd_usb_substream_playback_trigger
,
1708 .pointer
= snd_usb_pcm_pointer
,
1709 .page
= snd_pcm_lib_get_vmalloc_page
,
1710 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1713 static struct snd_pcm_ops snd_usb_capture_ops
= {
1714 .open
= snd_usb_capture_open
,
1715 .close
= snd_usb_capture_close
,
1716 .ioctl
= snd_pcm_lib_ioctl
,
1717 .hw_params
= snd_usb_hw_params
,
1718 .hw_free
= snd_usb_hw_free
,
1719 .prepare
= snd_usb_pcm_prepare
,
1720 .trigger
= snd_usb_substream_capture_trigger
,
1721 .pointer
= snd_usb_pcm_pointer
,
1722 .page
= snd_pcm_lib_get_vmalloc_page
,
1723 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1726 void snd_usb_set_pcm_ops(struct snd_pcm
*pcm
, int stream
)
1728 snd_pcm_set_ops(pcm
, stream
,
1729 stream
== SNDRV_PCM_STREAM_PLAYBACK
?
1730 &snd_usb_playback_ops
: &snd_usb_capture_ops
);