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 struct audioformat *find_format(struct snd_usb_substream *subs)
86 struct audioformat *fp;
87 struct audioformat *found = NULL;
88 int cur_attr = 0, attr;
90 list_for_each_entry(fp, &subs->fmt_list, list) {
91 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
93 if (fp->channels != subs->channels)
95 if (subs->cur_rate < fp->rate_min ||
96 subs->cur_rate > fp->rate_max)
98 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
100 for (i = 0; i < fp->nr_rates; i++)
101 if (fp->rate_table[i] == subs->cur_rate)
103 if (i >= fp->nr_rates)
106 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
112 /* avoid async out and adaptive in if the other method
113 * supports the same format.
114 * this is a workaround for the case like
115 * M-audio audiophile USB.
117 if (attr != cur_attr) {
118 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
119 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
120 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
121 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
123 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
124 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
125 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
126 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
132 /* find the format with the largest max. packet size */
133 if (fp->maxpacksize > found->maxpacksize) {
141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
142 struct usb_host_interface *alts,
143 struct audioformat *fmt)
145 struct usb_device *dev = chip->dev;
147 unsigned char data[1];
150 if (get_iface_desc(alts)->bNumEndpoints < 1)
152 ep = get_endpoint(alts, 0)->bEndpointAddress;
155 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
156 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
157 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
160 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
169 struct usb_host_interface *alts,
170 struct audioformat *fmt)
172 struct usb_device *dev = chip->dev;
173 unsigned char data[1];
177 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
178 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
179 UAC2_EP_CS_PITCH << 8, 0,
182 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
183 iface, fmt->altsetting);
191 * initialize the pitch control and sample rate
193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
194 struct usb_host_interface *alts,
195 struct audioformat *fmt)
197 /* if endpoint doesn't have pitch control, bail out */
198 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
201 switch (fmt->protocol) {
204 return init_pitch_v1(chip, iface, alts, fmt);
207 return init_pitch_v2(chip, iface, alts, fmt);
211 static int start_endpoints(struct snd_usb_substream *subs)
215 if (!subs->data_endpoint)
218 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
219 struct snd_usb_endpoint *ep = subs->data_endpoint;
221 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
223 ep->data_subs = subs;
224 err = snd_usb_endpoint_start(ep);
226 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
231 if (subs->sync_endpoint &&
232 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
233 struct snd_usb_endpoint *ep = subs->sync_endpoint;
235 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
236 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
237 err = usb_set_interface(subs->dev,
238 subs->sync_endpoint->iface,
239 subs->sync_endpoint->altsetting);
241 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
242 dev_err(&subs->dev->dev,
243 "%d:%d: cannot set interface (%d)\n",
244 subs->sync_endpoint->iface,
245 subs->sync_endpoint->altsetting, err);
250 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
252 ep->sync_slave = subs->data_endpoint;
253 err = snd_usb_endpoint_start(ep);
255 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
263 static void sync_pending_stops(struct snd_usb_substream *subs)
265 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
266 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
269 static void stop_endpoints(struct snd_usb_substream *subs)
271 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
272 snd_usb_endpoint_stop(subs->sync_endpoint);
274 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
275 snd_usb_endpoint_stop(subs->data_endpoint);
278 /* PCM sync_stop callback */
279 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
281 struct snd_usb_substream *subs = substream->runtime->private_data;
283 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
284 sync_pending_stops(subs);
285 snd_usb_unlock_shutdown(subs->stream->chip);
290 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
291 unsigned int altsetting,
292 struct usb_host_interface **alts,
295 struct usb_interface *iface;
296 struct usb_interface_descriptor *altsd;
297 struct usb_endpoint_descriptor *epd;
299 iface = usb_ifnum_to_if(dev, ifnum);
300 if (!iface || iface->num_altsetting < altsetting + 1)
302 *alts = &iface->altsetting[altsetting];
303 altsd = get_iface_desc(*alts);
304 if (altsd->bAlternateSetting != altsetting ||
305 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
306 (altsd->bInterfaceSubClass != 2 &&
307 altsd->bInterfaceProtocol != 2 ) ||
308 altsd->bNumEndpoints < 1)
310 epd = get_endpoint(*alts, 0);
311 if (!usb_endpoint_is_isoc_in(epd) ||
312 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
313 USB_ENDPOINT_USAGE_IMPLICIT_FB)
315 *ep = epd->bEndpointAddress;
319 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
320 * applies. Returns 1 if a quirk was found.
322 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
323 struct usb_device *dev,
324 struct usb_interface_descriptor *altsd,
327 struct usb_host_interface *alts;
328 struct usb_interface *iface;
332 /* Implicit feedback sync EPs consumers are always playback EPs */
333 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
336 switch (subs->stream->chip->usb_id) {
337 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
338 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
341 goto add_sync_ep_from_ifnum;
342 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
343 case USB_ID(0x0763, 0x2081):
346 goto add_sync_ep_from_ifnum;
347 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
350 goto add_sync_ep_from_ifnum;
351 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
354 goto add_sync_ep_from_ifnum;
355 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
356 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
359 goto add_sync_ep_from_ifnum;
360 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
362 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
368 goto add_sync_ep_from_ifnum;
369 case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
370 case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
373 goto add_sync_ep_from_ifnum;
374 case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
377 goto add_sync_ep_from_ifnum;
378 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
379 /* BOSS Katana amplifiers do not need quirks */
383 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
384 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
385 altsd->bInterfaceProtocol == 2 &&
386 altsd->bNumEndpoints == 1 &&
387 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
388 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
389 altsd->bAlternateSetting,
397 add_sync_ep_from_ifnum:
398 iface = usb_ifnum_to_if(dev, ifnum);
400 if (!iface || iface->num_altsetting < 2)
403 alts = &iface->altsetting[1];
406 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
407 alts, ep, !subs->direction,
408 SND_USB_ENDPOINT_TYPE_DATA);
409 if (!subs->sync_endpoint)
412 subs->sync_endpoint->is_implicit_feedback = 1;
414 subs->data_endpoint->sync_master = subs->sync_endpoint;
419 static int set_sync_endpoint(struct snd_usb_substream *subs,
420 struct audioformat *fmt,
421 struct usb_device *dev,
422 struct usb_host_interface *alts,
423 struct usb_interface_descriptor *altsd)
425 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
426 unsigned int ep, attr;
430 /* we need a sync pipe in async OUT or adaptive IN mode */
431 /* check the number of EP, since some devices have broken
432 * descriptors which fool us. if it has only one EP,
433 * assume it as adaptive-out or sync-in.
435 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
437 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
438 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
441 * In these modes the notion of sync_endpoint is irrelevant.
442 * Reset pointers to avoid using stale data from previously
443 * used settings, e.g. when configuration and endpoints were
447 subs->sync_endpoint = NULL;
448 subs->data_endpoint->sync_master = NULL;
451 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
455 /* endpoint set by quirk */
459 if (altsd->bNumEndpoints < 2)
462 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
463 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
464 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
468 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
469 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
470 * error fall back to SYNC mode and don't create sync endpoint
473 /* check sync-pipe endpoint */
474 /* ... and check descriptor size before accessing bSynchAddress
475 because there is a version of the SB Audigy 2 NX firmware lacking
476 the audio fields in the endpoint descriptors */
477 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
478 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
479 get_endpoint(alts, 1)->bSynchAddress != 0)) {
481 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
482 fmt->iface, fmt->altsetting,
483 get_endpoint(alts, 1)->bmAttributes,
484 get_endpoint(alts, 1)->bLength,
485 get_endpoint(alts, 1)->bSynchAddress);
486 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
490 ep = get_endpoint(alts, 1)->bEndpointAddress;
491 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
492 get_endpoint(alts, 0)->bSynchAddress != 0 &&
493 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
494 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
496 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
497 fmt->iface, fmt->altsetting,
498 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
499 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
504 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
505 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
507 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
508 alts, ep, !subs->direction,
510 SND_USB_ENDPOINT_TYPE_DATA :
511 SND_USB_ENDPOINT_TYPE_SYNC);
513 if (!subs->sync_endpoint) {
514 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
519 subs->sync_endpoint->is_implicit_feedback = implicit_fb;
521 subs->data_endpoint->sync_master = subs->sync_endpoint;
527 * find a matching format and set up the interface
529 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
531 struct usb_device *dev = subs->dev;
532 struct usb_host_interface *alts;
533 struct usb_interface_descriptor *altsd;
534 struct usb_interface *iface;
537 iface = usb_ifnum_to_if(dev, fmt->iface);
540 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
543 altsd = get_iface_desc(alts);
545 if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
548 /* close the old interface */
549 if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
550 if (!subs->stream->chip->keep_iface) {
551 err = usb_set_interface(subs->dev, subs->interface, 0);
554 "%d:%d: return to setting 0 failed (%d)\n",
555 fmt->iface, fmt->altsetting, err);
559 subs->interface = -1;
560 subs->altset_idx = 0;
563 if (subs->need_setup_fmt)
564 subs->need_setup_fmt = false;
567 if (iface->cur_altsetting != alts) {
568 err = snd_usb_select_mode_quirk(subs, fmt);
572 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
575 "%d:%d: usb_set_interface failed (%d)\n",
576 fmt->iface, fmt->altsetting, err);
579 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
580 fmt->iface, fmt->altsetting);
581 snd_usb_set_interface_quirk(dev);
584 subs->interface = fmt->iface;
585 subs->altset_idx = fmt->altset_idx;
586 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
587 alts, fmt->endpoint, subs->direction,
588 SND_USB_ENDPOINT_TYPE_DATA);
590 if (!subs->data_endpoint)
593 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
597 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
601 subs->cur_audiofmt = fmt;
603 snd_usb_set_format_quirk(subs, fmt);
609 * Return the score of matching two audioformats.
610 * Veto the audioformat if:
611 * - It has no channels for some reason.
612 * - Requested PCM format is not supported.
613 * - Requested sample rate is not supported.
615 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
616 struct audioformat *fp,
617 struct audioformat *match, int rate,
618 snd_pcm_format_t pcm_format)
623 if (fp->channels < 1) {
624 dev_dbg(&subs->dev->dev,
625 "%s: (fmt @%p) no channels\n", __func__, fp);
629 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
630 dev_dbg(&subs->dev->dev,
631 "%s: (fmt @%p) no match for format %d\n", __func__,
636 for (i = 0; i < fp->nr_rates; i++) {
637 if (fp->rate_table[i] == rate) {
643 dev_dbg(&subs->dev->dev,
644 "%s: (fmt @%p) no match for rate %d\n", __func__,
649 if (fp->channels == match->channels)
652 dev_dbg(&subs->dev->dev,
653 "%s: (fmt @%p) score %d\n", __func__, fp, score);
659 * Configure the sync ep using the rate and pcm format of the data ep.
661 static int configure_sync_endpoint(struct snd_usb_substream *subs)
664 struct audioformat *fp;
665 struct audioformat *sync_fp = NULL;
667 int sync_period_bytes = subs->period_bytes;
668 struct snd_usb_substream *sync_subs =
669 &subs->stream->substream[subs->direction ^ 1];
671 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
673 return snd_usb_endpoint_set_params(subs->sync_endpoint,
682 /* Try to find the best matching audioformat. */
683 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
684 int score = match_endpoint_audioformats(subs,
685 fp, subs->cur_audiofmt,
686 subs->cur_rate, subs->pcm_format);
688 if (score > cur_score) {
694 if (unlikely(sync_fp == NULL)) {
695 dev_err(&subs->dev->dev,
696 "%s: no valid audioformat for sync ep %x found\n",
697 __func__, sync_subs->ep_num);
702 * Recalculate the period bytes if channel number differ between
703 * data and sync ep audioformat.
705 if (sync_fp->channels != subs->channels) {
706 sync_period_bytes = (subs->period_bytes / subs->channels) *
708 dev_dbg(&subs->dev->dev,
709 "%s: adjusted sync ep period bytes (%d -> %d)\n",
710 __func__, subs->period_bytes, sync_period_bytes);
713 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
726 * configure endpoint params
728 * called during initial setup and upon resume
730 static int configure_endpoint(struct snd_usb_substream *subs)
735 stop_endpoints(subs);
736 sync_pending_stops(subs);
737 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
742 subs->buffer_periods,
745 subs->sync_endpoint);
749 if (subs->sync_endpoint)
750 ret = configure_sync_endpoint(subs);
755 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
762 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
764 dev_err(&subs->dev->dev,
765 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
766 subs->str_pd->pd_id, state, ret);
773 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
777 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
781 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
788 int snd_usb_pcm_resume(struct snd_usb_stream *as)
792 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
796 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
806 * allocate a buffer and set the given audio format.
808 * so far we use a physically linear buffer although packetize transfer
809 * doesn't need a continuous area.
810 * if sg buffer is supported on the later version of alsa, we'll follow
813 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
814 struct snd_pcm_hw_params *hw_params)
816 struct snd_usb_substream *subs = substream->runtime->private_data;
817 struct audioformat *fmt;
820 ret = snd_media_start_pipeline(subs);
824 subs->pcm_format = params_format(hw_params);
825 subs->period_bytes = params_period_bytes(hw_params);
826 subs->period_frames = params_period_size(hw_params);
827 subs->buffer_periods = params_periods(hw_params);
828 subs->channels = params_channels(hw_params);
829 subs->cur_rate = params_rate(hw_params);
831 fmt = find_format(subs);
833 dev_dbg(&subs->dev->dev,
834 "cannot set format: format = %#x, rate = %d, channels = %d\n",
835 subs->pcm_format, subs->cur_rate, subs->channels);
840 ret = snd_usb_lock_shutdown(subs->stream->chip);
844 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
848 ret = set_format(subs, fmt);
852 subs->interface = fmt->iface;
853 subs->altset_idx = fmt->altset_idx;
854 subs->need_setup_ep = true;
857 snd_usb_unlock_shutdown(subs->stream->chip);
863 snd_media_stop_pipeline(subs);
870 * reset the audio format and release the buffer
872 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
874 struct snd_usb_substream *subs = substream->runtime->private_data;
876 snd_media_stop_pipeline(subs);
877 subs->cur_audiofmt = NULL;
879 subs->period_bytes = 0;
880 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
881 stop_endpoints(subs);
882 sync_pending_stops(subs);
883 snd_usb_endpoint_deactivate(subs->sync_endpoint);
884 snd_usb_endpoint_deactivate(subs->data_endpoint);
885 snd_usb_unlock_shutdown(subs->stream->chip);
894 * only a few subtle things...
896 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
898 struct snd_pcm_runtime *runtime = substream->runtime;
899 struct snd_usb_substream *subs = runtime->private_data;
900 struct usb_host_interface *alts;
901 struct usb_interface *iface;
904 if (! subs->cur_audiofmt) {
905 dev_err(&subs->dev->dev, "no format is specified!\n");
909 ret = snd_usb_lock_shutdown(subs->stream->chip);
912 if (snd_BUG_ON(!subs->data_endpoint)) {
917 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
921 ret = set_format(subs, subs->cur_audiofmt);
925 if (subs->need_setup_ep) {
927 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
928 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
929 ret = snd_usb_init_sample_rate(subs->stream->chip,
930 subs->cur_audiofmt->iface,
937 ret = configure_endpoint(subs);
940 subs->need_setup_ep = false;
943 /* some unit conversions in runtime */
944 subs->data_endpoint->maxframesize =
945 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
946 subs->data_endpoint->curframesize =
947 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
949 /* reset the pointer */
950 subs->hwptr_done = 0;
951 subs->transfer_done = 0;
952 subs->last_delay = 0;
953 subs->last_frame_number = 0;
956 /* for playback, submit the URBs now; otherwise, the first hwptr_done
957 * updates for all URBs would happen at the same time when starting */
958 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
959 ret = start_endpoints(subs);
962 snd_usb_unlock_shutdown(subs->stream->chip);
966 static const struct snd_pcm_hardware snd_usb_hardware =
968 .info = SNDRV_PCM_INFO_MMAP |
969 SNDRV_PCM_INFO_MMAP_VALID |
970 SNDRV_PCM_INFO_BATCH |
971 SNDRV_PCM_INFO_INTERLEAVED |
972 SNDRV_PCM_INFO_BLOCK_TRANSFER |
973 SNDRV_PCM_INFO_PAUSE,
974 .buffer_bytes_max = 1024 * 1024,
975 .period_bytes_min = 64,
976 .period_bytes_max = 512 * 1024,
981 static int hw_check_valid_format(struct snd_usb_substream *subs,
982 struct snd_pcm_hw_params *params,
983 struct audioformat *fp)
985 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
986 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
987 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
988 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
989 struct snd_mask check_fmts;
992 /* check the format */
993 snd_mask_none(&check_fmts);
994 check_fmts.bits[0] = (u32)fp->formats;
995 check_fmts.bits[1] = (u32)(fp->formats >> 32);
996 snd_mask_intersect(&check_fmts, fmts);
997 if (snd_mask_empty(&check_fmts)) {
998 hwc_debug(" > check: no supported format %d\n", fp->format);
1001 /* check the channels */
1002 if (fp->channels < ct->min || fp->channels > ct->max) {
1003 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1006 /* check the rate is within the range */
1007 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1008 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1011 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1012 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1015 /* check whether the period time is >= the data packet interval */
1016 if (subs->speed != USB_SPEED_FULL) {
1017 ptime = 125 * (1 << fp->datainterval);
1018 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1019 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1026 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1027 struct snd_pcm_hw_rule *rule)
1029 struct snd_usb_substream *subs = rule->private;
1030 struct audioformat *fp;
1031 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1032 unsigned int rmin, rmax;
1035 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1038 list_for_each_entry(fp, &subs->fmt_list, list) {
1039 if (!hw_check_valid_format(subs, params, fp))
1042 if (rmin > fp->rate_min)
1043 rmin = fp->rate_min;
1044 if (rmax < fp->rate_max)
1045 rmax = fp->rate_max;
1047 rmin = fp->rate_min;
1048 rmax = fp->rate_max;
1053 hwc_debug(" --> get empty\n");
1059 if (it->min < rmin) {
1064 if (it->max > rmax) {
1069 if (snd_interval_checkempty(it)) {
1073 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1078 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1079 struct snd_pcm_hw_rule *rule)
1081 struct snd_usb_substream *subs = rule->private;
1082 struct audioformat *fp;
1083 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1084 unsigned int rmin, rmax;
1087 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1090 list_for_each_entry(fp, &subs->fmt_list, list) {
1091 if (!hw_check_valid_format(subs, params, fp))
1094 if (rmin > fp->channels)
1095 rmin = fp->channels;
1096 if (rmax < fp->channels)
1097 rmax = fp->channels;
1099 rmin = fp->channels;
1100 rmax = fp->channels;
1105 hwc_debug(" --> get empty\n");
1111 if (it->min < rmin) {
1116 if (it->max > rmax) {
1121 if (snd_interval_checkempty(it)) {
1125 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1129 static int hw_rule_format(struct snd_pcm_hw_params *params,
1130 struct snd_pcm_hw_rule *rule)
1132 struct snd_usb_substream *subs = rule->private;
1133 struct audioformat *fp;
1134 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1139 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1141 list_for_each_entry(fp, &subs->fmt_list, list) {
1142 if (!hw_check_valid_format(subs, params, fp))
1144 fbits |= fp->formats;
1147 oldbits[0] = fmt->bits[0];
1148 oldbits[1] = fmt->bits[1];
1149 fmt->bits[0] &= (u32)fbits;
1150 fmt->bits[1] &= (u32)(fbits >> 32);
1151 if (!fmt->bits[0] && !fmt->bits[1]) {
1152 hwc_debug(" --> get empty\n");
1155 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1156 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1160 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1161 struct snd_pcm_hw_rule *rule)
1163 struct snd_usb_substream *subs = rule->private;
1164 struct audioformat *fp;
1165 struct snd_interval *it;
1166 unsigned char min_datainterval;
1170 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1171 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1172 min_datainterval = 0xff;
1173 list_for_each_entry(fp, &subs->fmt_list, list) {
1174 if (!hw_check_valid_format(subs, params, fp))
1176 min_datainterval = min(min_datainterval, fp->datainterval);
1178 if (min_datainterval == 0xff) {
1179 hwc_debug(" --> get empty\n");
1183 pmin = 125 * (1 << min_datainterval);
1185 if (it->min < pmin) {
1190 if (snd_interval_checkempty(it)) {
1194 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1199 * If the device supports unusual bit rates, does the request meet these?
1201 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1202 struct snd_usb_substream *subs)
1204 struct audioformat *fp;
1206 int count = 0, needs_knot = 0;
1209 kfree(subs->rate_list.list);
1210 subs->rate_list.list = NULL;
1212 list_for_each_entry(fp, &subs->fmt_list, list) {
1213 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1215 count += fp->nr_rates;
1216 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1222 subs->rate_list.list = rate_list =
1223 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1224 if (!subs->rate_list.list)
1226 subs->rate_list.count = count;
1227 subs->rate_list.mask = 0;
1229 list_for_each_entry(fp, &subs->fmt_list, list) {
1231 for (i = 0; i < fp->nr_rates; i++)
1232 rate_list[count++] = fp->rate_table[i];
1234 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1244 * set up the runtime hardware information.
1247 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1249 struct audioformat *fp;
1250 unsigned int pt, ptmin;
1251 int param_period_time_if_needed;
1254 runtime->hw.formats = subs->formats;
1256 runtime->hw.rate_min = 0x7fffffff;
1257 runtime->hw.rate_max = 0;
1258 runtime->hw.channels_min = 256;
1259 runtime->hw.channels_max = 0;
1260 runtime->hw.rates = 0;
1262 /* check min/max rates and channels */
1263 list_for_each_entry(fp, &subs->fmt_list, list) {
1264 runtime->hw.rates |= fp->rates;
1265 if (runtime->hw.rate_min > fp->rate_min)
1266 runtime->hw.rate_min = fp->rate_min;
1267 if (runtime->hw.rate_max < fp->rate_max)
1268 runtime->hw.rate_max = fp->rate_max;
1269 if (runtime->hw.channels_min > fp->channels)
1270 runtime->hw.channels_min = fp->channels;
1271 if (runtime->hw.channels_max < fp->channels)
1272 runtime->hw.channels_max = fp->channels;
1273 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1274 /* FIXME: there might be more than one audio formats... */
1275 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1278 pt = 125 * (1 << fp->datainterval);
1279 ptmin = min(ptmin, pt);
1282 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1283 if (subs->speed == USB_SPEED_FULL)
1284 /* full speed devices have fixed data packet interval */
1287 /* if period time doesn't go below 1 ms, no rules needed */
1288 param_period_time_if_needed = -1;
1290 err = snd_pcm_hw_constraint_minmax(runtime,
1291 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1296 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1298 SNDRV_PCM_HW_PARAM_FORMAT,
1299 SNDRV_PCM_HW_PARAM_CHANNELS,
1300 param_period_time_if_needed,
1304 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1305 hw_rule_channels, subs,
1306 SNDRV_PCM_HW_PARAM_FORMAT,
1307 SNDRV_PCM_HW_PARAM_RATE,
1308 param_period_time_if_needed,
1312 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1313 hw_rule_format, subs,
1314 SNDRV_PCM_HW_PARAM_RATE,
1315 SNDRV_PCM_HW_PARAM_CHANNELS,
1316 param_period_time_if_needed,
1320 if (param_period_time_if_needed >= 0) {
1321 err = snd_pcm_hw_rule_add(runtime, 0,
1322 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1323 hw_rule_period_time, subs,
1324 SNDRV_PCM_HW_PARAM_FORMAT,
1325 SNDRV_PCM_HW_PARAM_CHANNELS,
1326 SNDRV_PCM_HW_PARAM_RATE,
1331 err = snd_usb_pcm_check_knot(runtime, subs);
1335 return snd_usb_autoresume(subs->stream->chip);
1338 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1340 int direction = substream->stream;
1341 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 struct snd_usb_substream *subs = &as->substream[direction];
1346 subs->interface = -1;
1347 subs->altset_idx = 0;
1348 runtime->hw = snd_usb_hardware;
1349 runtime->private_data = subs;
1350 subs->pcm_substream = substream;
1351 /* runtime PM is also done there */
1353 /* initialize DSD/DOP context */
1354 subs->dsd_dop.byte_idx = 0;
1355 subs->dsd_dop.channel = 0;
1356 subs->dsd_dop.marker = 1;
1358 ret = setup_hw_info(runtime, subs);
1360 ret = snd_media_stream_init(subs, as->pcm, direction);
1362 snd_usb_autosuspend(subs->stream->chip);
1367 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1369 int direction = substream->stream;
1370 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1371 struct snd_usb_substream *subs = &as->substream[direction];
1374 snd_media_stop_pipeline(subs);
1376 if (!as->chip->keep_iface &&
1377 subs->interface >= 0 &&
1378 !snd_usb_lock_shutdown(subs->stream->chip)) {
1379 usb_set_interface(subs->dev, subs->interface, 0);
1380 subs->interface = -1;
1381 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1382 snd_usb_unlock_shutdown(subs->stream->chip);
1387 subs->pcm_substream = NULL;
1388 snd_usb_autosuspend(subs->stream->chip);
1393 /* Since a URB can handle only a single linear buffer, we must use double
1394 * buffering when the data to be transferred overflows the buffer boundary.
1395 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1398 static void retire_capture_urb(struct snd_usb_substream *subs,
1401 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1402 unsigned int stride, frames, bytes, oldptr;
1403 int i, period_elapsed = 0;
1404 unsigned long flags;
1406 int current_frame_number;
1408 /* read frame number here, update pointer in critical section */
1409 current_frame_number = usb_get_current_frame_number(subs->dev);
1411 stride = runtime->frame_bits >> 3;
1413 for (i = 0; i < urb->number_of_packets; i++) {
1414 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1415 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1416 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1417 i, urb->iso_frame_desc[i].status);
1420 bytes = urb->iso_frame_desc[i].actual_length;
1421 frames = bytes / stride;
1422 if (!subs->txfr_quirk)
1423 bytes = frames * stride;
1424 if (bytes % (runtime->sample_bits >> 3) != 0) {
1425 int oldbytes = bytes;
1426 bytes = frames * stride;
1427 dev_warn_ratelimited(&subs->dev->dev,
1428 "Corrected urb data len. %d->%d\n",
1431 /* update the current pointer */
1432 spin_lock_irqsave(&subs->lock, flags);
1433 oldptr = subs->hwptr_done;
1434 subs->hwptr_done += bytes;
1435 if (subs->hwptr_done >= runtime->buffer_size * stride)
1436 subs->hwptr_done -= runtime->buffer_size * stride;
1437 frames = (bytes + (oldptr % stride)) / stride;
1438 subs->transfer_done += frames;
1439 if (subs->transfer_done >= runtime->period_size) {
1440 subs->transfer_done -= runtime->period_size;
1443 /* capture delay is by construction limited to one URB,
1446 runtime->delay = subs->last_delay = 0;
1448 /* realign last_frame_number */
1449 subs->last_frame_number = current_frame_number;
1450 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1452 spin_unlock_irqrestore(&subs->lock, flags);
1453 /* copy a data chunk */
1454 if (oldptr + bytes > runtime->buffer_size * stride) {
1455 unsigned int bytes1 =
1456 runtime->buffer_size * stride - oldptr;
1457 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1458 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1460 memcpy(runtime->dma_area + oldptr, cp, bytes);
1465 snd_pcm_period_elapsed(subs->pcm_substream);
1468 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1469 struct urb *urb, unsigned int bytes)
1471 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1472 unsigned int stride = runtime->frame_bits >> 3;
1473 unsigned int dst_idx = 0;
1474 unsigned int src_idx = subs->hwptr_done;
1475 unsigned int wrap = runtime->buffer_size * stride;
1476 u8 *dst = urb->transfer_buffer;
1477 u8 *src = runtime->dma_area;
1478 u8 marker[] = { 0x05, 0xfa };
1481 * The DSP DOP format defines a way to transport DSD samples over
1482 * normal PCM data endpoints. It requires stuffing of marker bytes
1483 * (0x05 and 0xfa, alternating per sample frame), and then expects
1484 * 2 additional bytes of actual payload. The whole frame is stored
1487 * Hence, for a stereo transport, the buffer layout looks like this,
1488 * where L refers to left channel samples and R to right.
1490 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1491 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1497 if (++subs->dsd_dop.byte_idx == 3) {
1498 /* frame boundary? */
1499 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1501 subs->dsd_dop.byte_idx = 0;
1503 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1504 /* alternate the marker */
1505 subs->dsd_dop.marker++;
1506 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1507 subs->dsd_dop.channel = 0;
1510 /* stuff the DSD payload */
1511 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1513 if (subs->cur_audiofmt->dsd_bitrev)
1514 dst[dst_idx++] = bitrev8(src[idx]);
1516 dst[dst_idx++] = src[idx];
1521 if (subs->hwptr_done >= runtime->buffer_size * stride)
1522 subs->hwptr_done -= runtime->buffer_size * stride;
1525 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1526 int offset, int stride, unsigned int bytes)
1528 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1530 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1531 /* err, the transferred area goes over buffer boundary. */
1532 unsigned int bytes1 =
1533 runtime->buffer_size * stride - subs->hwptr_done;
1534 memcpy(urb->transfer_buffer + offset,
1535 runtime->dma_area + subs->hwptr_done, bytes1);
1536 memcpy(urb->transfer_buffer + offset + bytes1,
1537 runtime->dma_area, bytes - bytes1);
1539 memcpy(urb->transfer_buffer + offset,
1540 runtime->dma_area + subs->hwptr_done, bytes);
1542 subs->hwptr_done += bytes;
1543 if (subs->hwptr_done >= runtime->buffer_size * stride)
1544 subs->hwptr_done -= runtime->buffer_size * stride;
1547 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1548 struct urb *urb, int stride,
1551 __le32 packet_length;
1554 /* Put __le32 length descriptor at start of each packet. */
1555 for (i = 0; i < urb->number_of_packets; i++) {
1556 unsigned int length = urb->iso_frame_desc[i].length;
1557 unsigned int offset = urb->iso_frame_desc[i].offset;
1559 packet_length = cpu_to_le32(length);
1560 offset += i * sizeof(packet_length);
1561 urb->iso_frame_desc[i].offset = offset;
1562 urb->iso_frame_desc[i].length += sizeof(packet_length);
1563 memcpy(urb->transfer_buffer + offset,
1564 &packet_length, sizeof(packet_length));
1565 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1568 /* Adjust transfer size accordingly. */
1569 bytes += urb->number_of_packets * sizeof(packet_length);
1573 static void prepare_playback_urb(struct snd_usb_substream *subs,
1576 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1577 struct snd_usb_endpoint *ep = subs->data_endpoint;
1578 struct snd_urb_ctx *ctx = urb->context;
1579 unsigned int counts, frames, bytes;
1580 int i, stride, period_elapsed = 0;
1581 unsigned long flags;
1583 stride = runtime->frame_bits >> 3;
1586 urb->number_of_packets = 0;
1587 spin_lock_irqsave(&subs->lock, flags);
1588 subs->frame_limit += ep->max_urb_frames;
1589 for (i = 0; i < ctx->packets; i++) {
1590 if (ctx->packet_size[i])
1591 counts = ctx->packet_size[i];
1592 else if (ep->sync_master)
1593 counts = snd_usb_endpoint_slave_next_packet_size(ep);
1595 counts = snd_usb_endpoint_next_packet_size(ep);
1597 /* set up descriptor */
1598 urb->iso_frame_desc[i].offset = frames * ep->stride;
1599 urb->iso_frame_desc[i].length = counts * ep->stride;
1601 urb->number_of_packets++;
1602 subs->transfer_done += counts;
1603 if (subs->transfer_done >= runtime->period_size) {
1604 subs->transfer_done -= runtime->period_size;
1605 subs->frame_limit = 0;
1607 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1608 if (subs->transfer_done > 0) {
1609 /* FIXME: fill-max mode is not
1611 frames -= subs->transfer_done;
1612 counts -= subs->transfer_done;
1613 urb->iso_frame_desc[i].length =
1614 counts * ep->stride;
1615 subs->transfer_done = 0;
1618 if (i < ctx->packets) {
1619 /* add a transfer delimiter */
1620 urb->iso_frame_desc[i].offset =
1621 frames * ep->stride;
1622 urb->iso_frame_desc[i].length = 0;
1623 urb->number_of_packets++;
1628 /* finish at the period boundary or after enough frames */
1629 if ((period_elapsed ||
1630 subs->transfer_done >= subs->frame_limit) &&
1631 !snd_usb_endpoint_implicit_feedback_sink(ep))
1634 bytes = frames * ep->stride;
1636 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1637 subs->cur_audiofmt->dsd_dop)) {
1638 fill_playback_urb_dsd_dop(subs, urb, bytes);
1639 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1640 subs->cur_audiofmt->dsd_bitrev)) {
1641 /* bit-reverse the bytes */
1642 u8 *buf = urb->transfer_buffer;
1643 for (i = 0; i < bytes; i++) {
1644 int idx = (subs->hwptr_done + i)
1645 % (runtime->buffer_size * stride);
1646 buf[i] = bitrev8(runtime->dma_area[idx]);
1649 subs->hwptr_done += bytes;
1650 if (subs->hwptr_done >= runtime->buffer_size * stride)
1651 subs->hwptr_done -= runtime->buffer_size * stride;
1654 if (!subs->tx_length_quirk)
1655 copy_to_urb(subs, urb, 0, stride, bytes);
1657 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1658 /* bytes is now amount of outgoing data */
1661 /* update delay with exact number of samples queued */
1662 runtime->delay = subs->last_delay;
1663 runtime->delay += frames;
1664 subs->last_delay = runtime->delay;
1666 /* realign last_frame_number */
1667 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1668 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1670 if (subs->trigger_tstamp_pending_update) {
1671 /* this is the first actual URB submitted,
1672 * update trigger timestamp to reflect actual start time
1674 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1675 subs->trigger_tstamp_pending_update = false;
1678 spin_unlock_irqrestore(&subs->lock, flags);
1679 urb->transfer_buffer_length = bytes;
1681 snd_pcm_period_elapsed(subs->pcm_substream);
1685 * process after playback data complete
1686 * - decrease the delay count again
1688 static void retire_playback_urb(struct snd_usb_substream *subs,
1691 unsigned long flags;
1692 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1693 struct snd_usb_endpoint *ep = subs->data_endpoint;
1694 int processed = urb->transfer_buffer_length / ep->stride;
1697 /* ignore the delay accounting when procssed=0 is given, i.e.
1698 * silent payloads are procssed before handling the actual data
1703 spin_lock_irqsave(&subs->lock, flags);
1704 if (!subs->last_delay)
1705 goto out; /* short path */
1707 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1708 /* update delay with exact number of samples played */
1709 if (processed > subs->last_delay)
1710 subs->last_delay = 0;
1712 subs->last_delay -= processed;
1713 runtime->delay = subs->last_delay;
1716 * Report when delay estimate is off by more than 2ms.
1717 * The error should be lower than 2ms since the estimate relies
1718 * on two reads of a counter updated every ms.
1720 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1721 dev_dbg_ratelimited(&subs->dev->dev,
1722 "delay: estimated %d, actual %d\n",
1723 est_delay, subs->last_delay);
1725 if (!subs->running) {
1726 /* update last_frame_number for delay counting here since
1727 * prepare_playback_urb won't be called during pause
1729 subs->last_frame_number =
1730 usb_get_current_frame_number(subs->dev) & 0xff;
1734 spin_unlock_irqrestore(&subs->lock, flags);
1737 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1740 struct snd_usb_substream *subs = substream->runtime->private_data;
1743 case SNDRV_PCM_TRIGGER_START:
1744 subs->trigger_tstamp_pending_update = true;
1746 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1747 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1748 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1751 case SNDRV_PCM_TRIGGER_STOP:
1752 stop_endpoints(subs);
1755 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1756 subs->data_endpoint->prepare_data_urb = NULL;
1757 /* keep retire_data_urb for delay calculation */
1758 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1761 case SNDRV_PCM_TRIGGER_SUSPEND:
1762 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1763 stop_endpoints(subs);
1764 subs->need_setup_fmt = true;
1773 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1777 struct snd_usb_substream *subs = substream->runtime->private_data;
1780 case SNDRV_PCM_TRIGGER_START:
1781 err = start_endpoints(subs);
1785 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1788 case SNDRV_PCM_TRIGGER_STOP:
1789 stop_endpoints(subs);
1790 subs->data_endpoint->retire_data_urb = NULL;
1793 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1794 subs->data_endpoint->retire_data_urb = NULL;
1797 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1798 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1801 case SNDRV_PCM_TRIGGER_SUSPEND:
1802 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1803 stop_endpoints(subs);
1804 subs->need_setup_fmt = true;
1813 static const struct snd_pcm_ops snd_usb_playback_ops = {
1814 .open = snd_usb_pcm_open,
1815 .close = snd_usb_pcm_close,
1816 .hw_params = snd_usb_hw_params,
1817 .hw_free = snd_usb_hw_free,
1818 .prepare = snd_usb_pcm_prepare,
1819 .trigger = snd_usb_substream_playback_trigger,
1820 .sync_stop = snd_usb_pcm_sync_stop,
1821 .pointer = snd_usb_pcm_pointer,
1824 static const struct snd_pcm_ops snd_usb_capture_ops = {
1825 .open = snd_usb_pcm_open,
1826 .close = snd_usb_pcm_close,
1827 .hw_params = snd_usb_hw_params,
1828 .hw_free = snd_usb_hw_free,
1829 .prepare = snd_usb_pcm_prepare,
1830 .trigger = snd_usb_substream_capture_trigger,
1831 .sync_stop = snd_usb_pcm_sync_stop,
1832 .pointer = snd_usb_pcm_pointer,
1835 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1837 const struct snd_pcm_ops *ops;
1839 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1840 &snd_usb_playback_ops : &snd_usb_capture_ops;
1841 snd_pcm_set_ops(pcm, stream, ops);
1844 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1846 struct snd_pcm *pcm = subs->stream->pcm;
1847 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1848 struct device *dev = subs->dev->bus->controller;
1850 if (snd_usb_use_vmalloc)
1851 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1854 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1855 dev, 64*1024, 512*1024);