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 stop_endpoints(struct snd_usb_substream *subs, bool wait)
265 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
266 snd_usb_endpoint_stop(subs->sync_endpoint);
268 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
269 snd_usb_endpoint_stop(subs->data_endpoint);
272 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
273 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
277 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
278 unsigned int altsetting,
279 struct usb_host_interface **alts,
282 struct usb_interface *iface;
283 struct usb_interface_descriptor *altsd;
284 struct usb_endpoint_descriptor *epd;
286 iface = usb_ifnum_to_if(dev, ifnum);
287 if (!iface || iface->num_altsetting < altsetting + 1)
289 *alts = &iface->altsetting[altsetting];
290 altsd = get_iface_desc(*alts);
291 if (altsd->bAlternateSetting != altsetting ||
292 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
293 (altsd->bInterfaceSubClass != 2 &&
294 altsd->bInterfaceProtocol != 2 ) ||
295 altsd->bNumEndpoints < 1)
297 epd = get_endpoint(*alts, 0);
298 if (!usb_endpoint_is_isoc_in(epd) ||
299 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
300 USB_ENDPOINT_USAGE_IMPLICIT_FB)
302 *ep = epd->bEndpointAddress;
306 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
307 * applies. Returns 1 if a quirk was found.
309 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
310 struct usb_device *dev,
311 struct usb_interface_descriptor *altsd,
314 struct usb_host_interface *alts;
315 struct usb_interface *iface;
319 /* Implicit feedback sync EPs consumers are always playback EPs */
320 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
323 switch (subs->stream->chip->usb_id) {
324 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
325 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
328 goto add_sync_ep_from_ifnum;
329 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
330 case USB_ID(0x0763, 0x2081):
333 goto add_sync_ep_from_ifnum;
334 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
337 goto add_sync_ep_from_ifnum;
338 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
341 goto add_sync_ep_from_ifnum;
342 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
343 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
346 goto add_sync_ep_from_ifnum;
347 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
350 goto add_sync_ep_from_ifnum;
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,
367 add_sync_ep_from_ifnum:
368 iface = usb_ifnum_to_if(dev, ifnum);
370 if (!iface || iface->num_altsetting == 0)
373 alts = &iface->altsetting[1];
376 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
377 alts, ep, !subs->direction,
378 SND_USB_ENDPOINT_TYPE_DATA);
379 if (!subs->sync_endpoint)
382 subs->data_endpoint->sync_master = subs->sync_endpoint;
387 static int set_sync_endpoint(struct snd_usb_substream *subs,
388 struct audioformat *fmt,
389 struct usb_device *dev,
390 struct usb_host_interface *alts,
391 struct usb_interface_descriptor *altsd)
393 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
394 unsigned int ep, attr;
398 /* we need a sync pipe in async OUT or adaptive IN mode */
399 /* check the number of EP, since some devices have broken
400 * descriptors which fool us. if it has only one EP,
401 * assume it as adaptive-out or sync-in.
403 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
405 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
406 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
409 * In these modes the notion of sync_endpoint is irrelevant.
410 * Reset pointers to avoid using stale data from previously
411 * used settings, e.g. when configuration and endpoints were
415 subs->sync_endpoint = NULL;
416 subs->data_endpoint->sync_master = NULL;
419 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
423 /* endpoint set by quirk */
427 if (altsd->bNumEndpoints < 2)
430 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
431 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
432 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
436 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
437 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
438 * error fall back to SYNC mode and don't create sync endpoint
441 /* check sync-pipe endpoint */
442 /* ... and check descriptor size before accessing bSynchAddress
443 because there is a version of the SB Audigy 2 NX firmware lacking
444 the audio fields in the endpoint descriptors */
445 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
446 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
447 get_endpoint(alts, 1)->bSynchAddress != 0)) {
449 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
450 fmt->iface, fmt->altsetting,
451 get_endpoint(alts, 1)->bmAttributes,
452 get_endpoint(alts, 1)->bLength,
453 get_endpoint(alts, 1)->bSynchAddress);
454 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
458 ep = get_endpoint(alts, 1)->bEndpointAddress;
459 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
460 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
461 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
463 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
464 fmt->iface, fmt->altsetting,
465 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
466 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
471 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
472 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
474 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
475 alts, ep, !subs->direction,
477 SND_USB_ENDPOINT_TYPE_DATA :
478 SND_USB_ENDPOINT_TYPE_SYNC);
479 if (!subs->sync_endpoint) {
480 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
485 subs->data_endpoint->sync_master = subs->sync_endpoint;
491 * find a matching format and set up the interface
493 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
495 struct usb_device *dev = subs->dev;
496 struct usb_host_interface *alts;
497 struct usb_interface_descriptor *altsd;
498 struct usb_interface *iface;
501 iface = usb_ifnum_to_if(dev, fmt->iface);
504 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
505 altsd = get_iface_desc(alts);
506 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
509 if (fmt == subs->cur_audiofmt)
512 /* close the old interface */
513 if (subs->interface >= 0 && subs->interface != fmt->iface) {
514 if (!subs->stream->chip->keep_iface) {
515 err = usb_set_interface(subs->dev, subs->interface, 0);
518 "%d:%d: return to setting 0 failed (%d)\n",
519 fmt->iface, fmt->altsetting, err);
523 subs->interface = -1;
524 subs->altset_idx = 0;
528 if (iface->cur_altsetting != alts) {
529 err = snd_usb_select_mode_quirk(subs, fmt);
533 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
536 "%d:%d: usb_set_interface failed (%d)\n",
537 fmt->iface, fmt->altsetting, err);
540 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
541 fmt->iface, fmt->altsetting);
542 snd_usb_set_interface_quirk(dev);
545 subs->interface = fmt->iface;
546 subs->altset_idx = fmt->altset_idx;
547 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
548 alts, fmt->endpoint, subs->direction,
549 SND_USB_ENDPOINT_TYPE_DATA);
551 if (!subs->data_endpoint)
554 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
558 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
562 subs->cur_audiofmt = fmt;
564 snd_usb_set_format_quirk(subs, fmt);
570 * Return the score of matching two audioformats.
571 * Veto the audioformat if:
572 * - It has no channels for some reason.
573 * - Requested PCM format is not supported.
574 * - Requested sample rate is not supported.
576 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
577 struct audioformat *fp,
578 struct audioformat *match, int rate,
579 snd_pcm_format_t pcm_format)
584 if (fp->channels < 1) {
585 dev_dbg(&subs->dev->dev,
586 "%s: (fmt @%p) no channels\n", __func__, fp);
590 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
591 dev_dbg(&subs->dev->dev,
592 "%s: (fmt @%p) no match for format %d\n", __func__,
597 for (i = 0; i < fp->nr_rates; i++) {
598 if (fp->rate_table[i] == rate) {
604 dev_dbg(&subs->dev->dev,
605 "%s: (fmt @%p) no match for rate %d\n", __func__,
610 if (fp->channels == match->channels)
613 dev_dbg(&subs->dev->dev,
614 "%s: (fmt @%p) score %d\n", __func__, fp, score);
620 * Configure the sync ep using the rate and pcm format of the data ep.
622 static int configure_sync_endpoint(struct snd_usb_substream *subs)
625 struct audioformat *fp;
626 struct audioformat *sync_fp = NULL;
628 int sync_period_bytes = subs->period_bytes;
629 struct snd_usb_substream *sync_subs =
630 &subs->stream->substream[subs->direction ^ 1];
632 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
634 return snd_usb_endpoint_set_params(subs->sync_endpoint,
643 /* Try to find the best matching audioformat. */
644 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
645 int score = match_endpoint_audioformats(subs,
646 fp, subs->cur_audiofmt,
647 subs->cur_rate, subs->pcm_format);
649 if (score > cur_score) {
655 if (unlikely(sync_fp == NULL)) {
656 dev_err(&subs->dev->dev,
657 "%s: no valid audioformat for sync ep %x found\n",
658 __func__, sync_subs->ep_num);
663 * Recalculate the period bytes if channel number differ between
664 * data and sync ep audioformat.
666 if (sync_fp->channels != subs->channels) {
667 sync_period_bytes = (subs->period_bytes / subs->channels) *
669 dev_dbg(&subs->dev->dev,
670 "%s: adjusted sync ep period bytes (%d -> %d)\n",
671 __func__, subs->period_bytes, sync_period_bytes);
674 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
687 * configure endpoint params
689 * called during initial setup and upon resume
691 static int configure_endpoint(struct snd_usb_substream *subs)
696 stop_endpoints(subs, true);
697 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
702 subs->buffer_periods,
705 subs->sync_endpoint);
709 if (subs->sync_endpoint)
710 ret = configure_sync_endpoint(subs);
715 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
722 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
724 dev_err(&subs->dev->dev,
725 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
726 subs->str_pd->pd_id, state, ret);
733 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
737 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
741 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
748 int snd_usb_pcm_resume(struct snd_usb_stream *as)
752 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
756 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
766 * allocate a buffer and set the given audio format.
768 * so far we use a physically linear buffer although packetize transfer
769 * doesn't need a continuous area.
770 * if sg buffer is supported on the later version of alsa, we'll follow
773 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
774 struct snd_pcm_hw_params *hw_params)
776 struct snd_usb_substream *subs = substream->runtime->private_data;
777 struct audioformat *fmt;
780 ret = snd_media_start_pipeline(subs);
784 if (snd_usb_use_vmalloc)
785 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
786 params_buffer_bytes(hw_params));
788 ret = snd_pcm_lib_malloc_pages(substream,
789 params_buffer_bytes(hw_params));
793 subs->pcm_format = params_format(hw_params);
794 subs->period_bytes = params_period_bytes(hw_params);
795 subs->period_frames = params_period_size(hw_params);
796 subs->buffer_periods = params_periods(hw_params);
797 subs->channels = params_channels(hw_params);
798 subs->cur_rate = params_rate(hw_params);
800 fmt = find_format(subs);
802 dev_dbg(&subs->dev->dev,
803 "cannot set format: format = %#x, rate = %d, channels = %d\n",
804 subs->pcm_format, subs->cur_rate, subs->channels);
809 ret = snd_usb_lock_shutdown(subs->stream->chip);
813 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
817 ret = set_format(subs, fmt);
821 subs->interface = fmt->iface;
822 subs->altset_idx = fmt->altset_idx;
823 subs->need_setup_ep = true;
826 snd_usb_unlock_shutdown(subs->stream->chip);
832 snd_media_stop_pipeline(subs);
839 * reset the audio format and release the buffer
841 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
843 struct snd_usb_substream *subs = substream->runtime->private_data;
845 snd_media_stop_pipeline(subs);
846 subs->cur_audiofmt = NULL;
848 subs->period_bytes = 0;
849 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
850 stop_endpoints(subs, true);
851 snd_usb_endpoint_deactivate(subs->sync_endpoint);
852 snd_usb_endpoint_deactivate(subs->data_endpoint);
853 snd_usb_unlock_shutdown(subs->stream->chip);
856 if (snd_usb_use_vmalloc)
857 return snd_pcm_lib_free_vmalloc_buffer(substream);
859 return snd_pcm_lib_free_pages(substream);
865 * only a few subtle things...
867 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
869 struct snd_pcm_runtime *runtime = substream->runtime;
870 struct snd_usb_substream *subs = runtime->private_data;
871 struct usb_host_interface *alts;
872 struct usb_interface *iface;
875 if (! subs->cur_audiofmt) {
876 dev_err(&subs->dev->dev, "no format is specified!\n");
880 ret = snd_usb_lock_shutdown(subs->stream->chip);
883 if (snd_BUG_ON(!subs->data_endpoint)) {
888 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
889 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
891 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
895 ret = set_format(subs, subs->cur_audiofmt);
899 if (subs->need_setup_ep) {
901 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
902 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
903 ret = snd_usb_init_sample_rate(subs->stream->chip,
904 subs->cur_audiofmt->iface,
911 ret = configure_endpoint(subs);
914 subs->need_setup_ep = false;
917 /* some unit conversions in runtime */
918 subs->data_endpoint->maxframesize =
919 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
920 subs->data_endpoint->curframesize =
921 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
923 /* reset the pointer */
924 subs->hwptr_done = 0;
925 subs->transfer_done = 0;
926 subs->last_delay = 0;
927 subs->last_frame_number = 0;
930 /* for playback, submit the URBs now; otherwise, the first hwptr_done
931 * updates for all URBs would happen at the same time when starting */
932 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
933 ret = start_endpoints(subs);
936 snd_usb_unlock_shutdown(subs->stream->chip);
940 static const struct snd_pcm_hardware snd_usb_hardware =
942 .info = SNDRV_PCM_INFO_MMAP |
943 SNDRV_PCM_INFO_MMAP_VALID |
944 SNDRV_PCM_INFO_BATCH |
945 SNDRV_PCM_INFO_INTERLEAVED |
946 SNDRV_PCM_INFO_BLOCK_TRANSFER |
947 SNDRV_PCM_INFO_PAUSE,
948 .buffer_bytes_max = 1024 * 1024,
949 .period_bytes_min = 64,
950 .period_bytes_max = 512 * 1024,
955 static int hw_check_valid_format(struct snd_usb_substream *subs,
956 struct snd_pcm_hw_params *params,
957 struct audioformat *fp)
959 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
960 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
961 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
962 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
963 struct snd_mask check_fmts;
966 /* check the format */
967 snd_mask_none(&check_fmts);
968 check_fmts.bits[0] = (u32)fp->formats;
969 check_fmts.bits[1] = (u32)(fp->formats >> 32);
970 snd_mask_intersect(&check_fmts, fmts);
971 if (snd_mask_empty(&check_fmts)) {
972 hwc_debug(" > check: no supported format %d\n", fp->format);
975 /* check the channels */
976 if (fp->channels < ct->min || fp->channels > ct->max) {
977 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
980 /* check the rate is within the range */
981 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
982 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
985 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
986 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
989 /* check whether the period time is >= the data packet interval */
990 if (subs->speed != USB_SPEED_FULL) {
991 ptime = 125 * (1 << fp->datainterval);
992 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
993 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1000 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1001 struct snd_pcm_hw_rule *rule)
1003 struct snd_usb_substream *subs = rule->private;
1004 struct audioformat *fp;
1005 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1006 unsigned int rmin, rmax;
1009 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1012 list_for_each_entry(fp, &subs->fmt_list, list) {
1013 if (!hw_check_valid_format(subs, params, fp))
1016 if (rmin > fp->rate_min)
1017 rmin = fp->rate_min;
1018 if (rmax < fp->rate_max)
1019 rmax = fp->rate_max;
1021 rmin = fp->rate_min;
1022 rmax = fp->rate_max;
1027 hwc_debug(" --> get empty\n");
1033 if (it->min < rmin) {
1038 if (it->max > rmax) {
1043 if (snd_interval_checkempty(it)) {
1047 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1052 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1053 struct snd_pcm_hw_rule *rule)
1055 struct snd_usb_substream *subs = rule->private;
1056 struct audioformat *fp;
1057 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1058 unsigned int rmin, rmax;
1061 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1064 list_for_each_entry(fp, &subs->fmt_list, list) {
1065 if (!hw_check_valid_format(subs, params, fp))
1068 if (rmin > fp->channels)
1069 rmin = fp->channels;
1070 if (rmax < fp->channels)
1071 rmax = fp->channels;
1073 rmin = fp->channels;
1074 rmax = fp->channels;
1079 hwc_debug(" --> get empty\n");
1085 if (it->min < rmin) {
1090 if (it->max > rmax) {
1095 if (snd_interval_checkempty(it)) {
1099 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1103 static int hw_rule_format(struct snd_pcm_hw_params *params,
1104 struct snd_pcm_hw_rule *rule)
1106 struct snd_usb_substream *subs = rule->private;
1107 struct audioformat *fp;
1108 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1113 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1115 list_for_each_entry(fp, &subs->fmt_list, list) {
1116 if (!hw_check_valid_format(subs, params, fp))
1118 fbits |= fp->formats;
1121 oldbits[0] = fmt->bits[0];
1122 oldbits[1] = fmt->bits[1];
1123 fmt->bits[0] &= (u32)fbits;
1124 fmt->bits[1] &= (u32)(fbits >> 32);
1125 if (!fmt->bits[0] && !fmt->bits[1]) {
1126 hwc_debug(" --> get empty\n");
1129 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1130 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1134 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1135 struct snd_pcm_hw_rule *rule)
1137 struct snd_usb_substream *subs = rule->private;
1138 struct audioformat *fp;
1139 struct snd_interval *it;
1140 unsigned char min_datainterval;
1144 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1145 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1146 min_datainterval = 0xff;
1147 list_for_each_entry(fp, &subs->fmt_list, list) {
1148 if (!hw_check_valid_format(subs, params, fp))
1150 min_datainterval = min(min_datainterval, fp->datainterval);
1152 if (min_datainterval == 0xff) {
1153 hwc_debug(" --> get empty\n");
1157 pmin = 125 * (1 << min_datainterval);
1159 if (it->min < pmin) {
1164 if (snd_interval_checkempty(it)) {
1168 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1173 * If the device supports unusual bit rates, does the request meet these?
1175 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1176 struct snd_usb_substream *subs)
1178 struct audioformat *fp;
1180 int count = 0, needs_knot = 0;
1183 kfree(subs->rate_list.list);
1184 subs->rate_list.list = NULL;
1186 list_for_each_entry(fp, &subs->fmt_list, list) {
1187 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1189 count += fp->nr_rates;
1190 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1196 subs->rate_list.list = rate_list =
1197 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1198 if (!subs->rate_list.list)
1200 subs->rate_list.count = count;
1201 subs->rate_list.mask = 0;
1203 list_for_each_entry(fp, &subs->fmt_list, list) {
1205 for (i = 0; i < fp->nr_rates; i++)
1206 rate_list[count++] = fp->rate_table[i];
1208 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1218 * set up the runtime hardware information.
1221 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1223 struct audioformat *fp;
1224 unsigned int pt, ptmin;
1225 int param_period_time_if_needed;
1228 runtime->hw.formats = subs->formats;
1230 runtime->hw.rate_min = 0x7fffffff;
1231 runtime->hw.rate_max = 0;
1232 runtime->hw.channels_min = 256;
1233 runtime->hw.channels_max = 0;
1234 runtime->hw.rates = 0;
1236 /* check min/max rates and channels */
1237 list_for_each_entry(fp, &subs->fmt_list, list) {
1238 runtime->hw.rates |= fp->rates;
1239 if (runtime->hw.rate_min > fp->rate_min)
1240 runtime->hw.rate_min = fp->rate_min;
1241 if (runtime->hw.rate_max < fp->rate_max)
1242 runtime->hw.rate_max = fp->rate_max;
1243 if (runtime->hw.channels_min > fp->channels)
1244 runtime->hw.channels_min = fp->channels;
1245 if (runtime->hw.channels_max < fp->channels)
1246 runtime->hw.channels_max = fp->channels;
1247 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1248 /* FIXME: there might be more than one audio formats... */
1249 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1252 pt = 125 * (1 << fp->datainterval);
1253 ptmin = min(ptmin, pt);
1256 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1257 if (subs->speed == USB_SPEED_FULL)
1258 /* full speed devices have fixed data packet interval */
1261 /* if period time doesn't go below 1 ms, no rules needed */
1262 param_period_time_if_needed = -1;
1264 err = snd_pcm_hw_constraint_minmax(runtime,
1265 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1270 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1272 SNDRV_PCM_HW_PARAM_FORMAT,
1273 SNDRV_PCM_HW_PARAM_CHANNELS,
1274 param_period_time_if_needed,
1278 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1279 hw_rule_channels, subs,
1280 SNDRV_PCM_HW_PARAM_FORMAT,
1281 SNDRV_PCM_HW_PARAM_RATE,
1282 param_period_time_if_needed,
1286 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1287 hw_rule_format, subs,
1288 SNDRV_PCM_HW_PARAM_RATE,
1289 SNDRV_PCM_HW_PARAM_CHANNELS,
1290 param_period_time_if_needed,
1294 if (param_period_time_if_needed >= 0) {
1295 err = snd_pcm_hw_rule_add(runtime, 0,
1296 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1297 hw_rule_period_time, subs,
1298 SNDRV_PCM_HW_PARAM_FORMAT,
1299 SNDRV_PCM_HW_PARAM_CHANNELS,
1300 SNDRV_PCM_HW_PARAM_RATE,
1305 err = snd_usb_pcm_check_knot(runtime, subs);
1309 return snd_usb_autoresume(subs->stream->chip);
1312 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1314 int direction = substream->stream;
1315 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1316 struct snd_pcm_runtime *runtime = substream->runtime;
1317 struct snd_usb_substream *subs = &as->substream[direction];
1320 subs->interface = -1;
1321 subs->altset_idx = 0;
1322 runtime->hw = snd_usb_hardware;
1323 runtime->private_data = subs;
1324 subs->pcm_substream = substream;
1325 /* runtime PM is also done there */
1327 /* initialize DSD/DOP context */
1328 subs->dsd_dop.byte_idx = 0;
1329 subs->dsd_dop.channel = 0;
1330 subs->dsd_dop.marker = 1;
1332 ret = setup_hw_info(runtime, subs);
1334 ret = snd_media_stream_init(subs, as->pcm, direction);
1336 snd_usb_autosuspend(subs->stream->chip);
1341 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1343 int direction = substream->stream;
1344 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1345 struct snd_usb_substream *subs = &as->substream[direction];
1348 stop_endpoints(subs, true);
1349 snd_media_stop_pipeline(subs);
1351 if (!as->chip->keep_iface &&
1352 subs->interface >= 0 &&
1353 !snd_usb_lock_shutdown(subs->stream->chip)) {
1354 usb_set_interface(subs->dev, subs->interface, 0);
1355 subs->interface = -1;
1356 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1357 snd_usb_unlock_shutdown(subs->stream->chip);
1362 subs->pcm_substream = NULL;
1363 snd_usb_autosuspend(subs->stream->chip);
1368 /* Since a URB can handle only a single linear buffer, we must use double
1369 * buffering when the data to be transferred overflows the buffer boundary.
1370 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1373 static void retire_capture_urb(struct snd_usb_substream *subs,
1376 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1377 unsigned int stride, frames, bytes, oldptr;
1378 int i, period_elapsed = 0;
1379 unsigned long flags;
1381 int current_frame_number;
1383 /* read frame number here, update pointer in critical section */
1384 current_frame_number = usb_get_current_frame_number(subs->dev);
1386 stride = runtime->frame_bits >> 3;
1388 for (i = 0; i < urb->number_of_packets; i++) {
1389 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1390 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1391 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1392 i, urb->iso_frame_desc[i].status);
1395 bytes = urb->iso_frame_desc[i].actual_length;
1396 frames = bytes / stride;
1397 if (!subs->txfr_quirk)
1398 bytes = frames * stride;
1399 if (bytes % (runtime->sample_bits >> 3) != 0) {
1400 int oldbytes = bytes;
1401 bytes = frames * stride;
1402 dev_warn_ratelimited(&subs->dev->dev,
1403 "Corrected urb data len. %d->%d\n",
1406 /* update the current pointer */
1407 spin_lock_irqsave(&subs->lock, flags);
1408 oldptr = subs->hwptr_done;
1409 subs->hwptr_done += bytes;
1410 if (subs->hwptr_done >= runtime->buffer_size * stride)
1411 subs->hwptr_done -= runtime->buffer_size * stride;
1412 frames = (bytes + (oldptr % stride)) / stride;
1413 subs->transfer_done += frames;
1414 if (subs->transfer_done >= runtime->period_size) {
1415 subs->transfer_done -= runtime->period_size;
1418 /* capture delay is by construction limited to one URB,
1421 runtime->delay = subs->last_delay = 0;
1423 /* realign last_frame_number */
1424 subs->last_frame_number = current_frame_number;
1425 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1427 spin_unlock_irqrestore(&subs->lock, flags);
1428 /* copy a data chunk */
1429 if (oldptr + bytes > runtime->buffer_size * stride) {
1430 unsigned int bytes1 =
1431 runtime->buffer_size * stride - oldptr;
1432 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1433 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1435 memcpy(runtime->dma_area + oldptr, cp, bytes);
1440 snd_pcm_period_elapsed(subs->pcm_substream);
1443 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1444 struct urb *urb, unsigned int bytes)
1446 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1447 unsigned int stride = runtime->frame_bits >> 3;
1448 unsigned int dst_idx = 0;
1449 unsigned int src_idx = subs->hwptr_done;
1450 unsigned int wrap = runtime->buffer_size * stride;
1451 u8 *dst = urb->transfer_buffer;
1452 u8 *src = runtime->dma_area;
1453 u8 marker[] = { 0x05, 0xfa };
1456 * The DSP DOP format defines a way to transport DSD samples over
1457 * normal PCM data endpoints. It requires stuffing of marker bytes
1458 * (0x05 and 0xfa, alternating per sample frame), and then expects
1459 * 2 additional bytes of actual payload. The whole frame is stored
1462 * Hence, for a stereo transport, the buffer layout looks like this,
1463 * where L refers to left channel samples and R to right.
1465 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1466 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1472 if (++subs->dsd_dop.byte_idx == 3) {
1473 /* frame boundary? */
1474 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1476 subs->dsd_dop.byte_idx = 0;
1478 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1479 /* alternate the marker */
1480 subs->dsd_dop.marker++;
1481 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1482 subs->dsd_dop.channel = 0;
1485 /* stuff the DSD payload */
1486 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1488 if (subs->cur_audiofmt->dsd_bitrev)
1489 dst[dst_idx++] = bitrev8(src[idx]);
1491 dst[dst_idx++] = src[idx];
1496 if (subs->hwptr_done >= runtime->buffer_size * stride)
1497 subs->hwptr_done -= runtime->buffer_size * stride;
1500 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1501 int offset, int stride, unsigned int bytes)
1503 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1505 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1506 /* err, the transferred area goes over buffer boundary. */
1507 unsigned int bytes1 =
1508 runtime->buffer_size * stride - subs->hwptr_done;
1509 memcpy(urb->transfer_buffer + offset,
1510 runtime->dma_area + subs->hwptr_done, bytes1);
1511 memcpy(urb->transfer_buffer + offset + bytes1,
1512 runtime->dma_area, bytes - bytes1);
1514 memcpy(urb->transfer_buffer + offset,
1515 runtime->dma_area + subs->hwptr_done, bytes);
1517 subs->hwptr_done += bytes;
1518 if (subs->hwptr_done >= runtime->buffer_size * stride)
1519 subs->hwptr_done -= runtime->buffer_size * stride;
1522 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1523 struct urb *urb, int stride,
1526 __le32 packet_length;
1529 /* Put __le32 length descriptor at start of each packet. */
1530 for (i = 0; i < urb->number_of_packets; i++) {
1531 unsigned int length = urb->iso_frame_desc[i].length;
1532 unsigned int offset = urb->iso_frame_desc[i].offset;
1534 packet_length = cpu_to_le32(length);
1535 offset += i * sizeof(packet_length);
1536 urb->iso_frame_desc[i].offset = offset;
1537 urb->iso_frame_desc[i].length += sizeof(packet_length);
1538 memcpy(urb->transfer_buffer + offset,
1539 &packet_length, sizeof(packet_length));
1540 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1543 /* Adjust transfer size accordingly. */
1544 bytes += urb->number_of_packets * sizeof(packet_length);
1548 static void prepare_playback_urb(struct snd_usb_substream *subs,
1551 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1552 struct snd_usb_endpoint *ep = subs->data_endpoint;
1553 struct snd_urb_ctx *ctx = urb->context;
1554 unsigned int counts, frames, bytes;
1555 int i, stride, period_elapsed = 0;
1556 unsigned long flags;
1558 stride = runtime->frame_bits >> 3;
1561 urb->number_of_packets = 0;
1562 spin_lock_irqsave(&subs->lock, flags);
1563 subs->frame_limit += ep->max_urb_frames;
1564 for (i = 0; i < ctx->packets; i++) {
1565 if (ctx->packet_size[i])
1566 counts = ctx->packet_size[i];
1568 counts = snd_usb_endpoint_next_packet_size(ep);
1570 /* set up descriptor */
1571 urb->iso_frame_desc[i].offset = frames * ep->stride;
1572 urb->iso_frame_desc[i].length = counts * ep->stride;
1574 urb->number_of_packets++;
1575 subs->transfer_done += counts;
1576 if (subs->transfer_done >= runtime->period_size) {
1577 subs->transfer_done -= runtime->period_size;
1578 subs->frame_limit = 0;
1580 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1581 if (subs->transfer_done > 0) {
1582 /* FIXME: fill-max mode is not
1584 frames -= subs->transfer_done;
1585 counts -= subs->transfer_done;
1586 urb->iso_frame_desc[i].length =
1587 counts * ep->stride;
1588 subs->transfer_done = 0;
1591 if (i < ctx->packets) {
1592 /* add a transfer delimiter */
1593 urb->iso_frame_desc[i].offset =
1594 frames * ep->stride;
1595 urb->iso_frame_desc[i].length = 0;
1596 urb->number_of_packets++;
1601 /* finish at the period boundary or after enough frames */
1602 if ((period_elapsed ||
1603 subs->transfer_done >= subs->frame_limit) &&
1604 !snd_usb_endpoint_implicit_feedback_sink(ep))
1607 bytes = frames * ep->stride;
1609 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1610 subs->cur_audiofmt->dsd_dop)) {
1611 fill_playback_urb_dsd_dop(subs, urb, bytes);
1612 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1613 subs->cur_audiofmt->dsd_bitrev)) {
1614 /* bit-reverse the bytes */
1615 u8 *buf = urb->transfer_buffer;
1616 for (i = 0; i < bytes; i++) {
1617 int idx = (subs->hwptr_done + i)
1618 % (runtime->buffer_size * stride);
1619 buf[i] = bitrev8(runtime->dma_area[idx]);
1622 subs->hwptr_done += bytes;
1623 if (subs->hwptr_done >= runtime->buffer_size * stride)
1624 subs->hwptr_done -= runtime->buffer_size * stride;
1627 if (!subs->tx_length_quirk)
1628 copy_to_urb(subs, urb, 0, stride, bytes);
1630 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1631 /* bytes is now amount of outgoing data */
1634 /* update delay with exact number of samples queued */
1635 runtime->delay = subs->last_delay;
1636 runtime->delay += frames;
1637 subs->last_delay = runtime->delay;
1639 /* realign last_frame_number */
1640 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1641 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1643 if (subs->trigger_tstamp_pending_update) {
1644 /* this is the first actual URB submitted,
1645 * update trigger timestamp to reflect actual start time
1647 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1648 subs->trigger_tstamp_pending_update = false;
1651 spin_unlock_irqrestore(&subs->lock, flags);
1652 urb->transfer_buffer_length = bytes;
1654 snd_pcm_period_elapsed(subs->pcm_substream);
1658 * process after playback data complete
1659 * - decrease the delay count again
1661 static void retire_playback_urb(struct snd_usb_substream *subs,
1664 unsigned long flags;
1665 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1666 struct snd_usb_endpoint *ep = subs->data_endpoint;
1667 int processed = urb->transfer_buffer_length / ep->stride;
1670 /* ignore the delay accounting when procssed=0 is given, i.e.
1671 * silent payloads are procssed before handling the actual data
1676 spin_lock_irqsave(&subs->lock, flags);
1677 if (!subs->last_delay)
1678 goto out; /* short path */
1680 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1681 /* update delay with exact number of samples played */
1682 if (processed > subs->last_delay)
1683 subs->last_delay = 0;
1685 subs->last_delay -= processed;
1686 runtime->delay = subs->last_delay;
1689 * Report when delay estimate is off by more than 2ms.
1690 * The error should be lower than 2ms since the estimate relies
1691 * on two reads of a counter updated every ms.
1693 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1694 dev_dbg_ratelimited(&subs->dev->dev,
1695 "delay: estimated %d, actual %d\n",
1696 est_delay, subs->last_delay);
1698 if (!subs->running) {
1699 /* update last_frame_number for delay counting here since
1700 * prepare_playback_urb won't be called during pause
1702 subs->last_frame_number =
1703 usb_get_current_frame_number(subs->dev) & 0xff;
1707 spin_unlock_irqrestore(&subs->lock, flags);
1710 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1713 struct snd_usb_substream *subs = substream->runtime->private_data;
1716 case SNDRV_PCM_TRIGGER_START:
1717 subs->trigger_tstamp_pending_update = true;
1719 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1720 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1721 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1724 case SNDRV_PCM_TRIGGER_STOP:
1725 stop_endpoints(subs, false);
1728 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1729 subs->data_endpoint->prepare_data_urb = NULL;
1730 /* keep retire_data_urb for delay calculation */
1731 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1739 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1743 struct snd_usb_substream *subs = substream->runtime->private_data;
1746 case SNDRV_PCM_TRIGGER_START:
1747 err = start_endpoints(subs);
1751 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1754 case SNDRV_PCM_TRIGGER_STOP:
1755 stop_endpoints(subs, false);
1758 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1759 subs->data_endpoint->retire_data_urb = NULL;
1762 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1763 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1771 static const struct snd_pcm_ops snd_usb_playback_ops = {
1772 .open = snd_usb_pcm_open,
1773 .close = snd_usb_pcm_close,
1774 .ioctl = snd_pcm_lib_ioctl,
1775 .hw_params = snd_usb_hw_params,
1776 .hw_free = snd_usb_hw_free,
1777 .prepare = snd_usb_pcm_prepare,
1778 .trigger = snd_usb_substream_playback_trigger,
1779 .pointer = snd_usb_pcm_pointer,
1780 .page = snd_pcm_lib_get_vmalloc_page,
1783 static const struct snd_pcm_ops snd_usb_capture_ops = {
1784 .open = snd_usb_pcm_open,
1785 .close = snd_usb_pcm_close,
1786 .ioctl = snd_pcm_lib_ioctl,
1787 .hw_params = snd_usb_hw_params,
1788 .hw_free = snd_usb_hw_free,
1789 .prepare = snd_usb_pcm_prepare,
1790 .trigger = snd_usb_substream_capture_trigger,
1791 .pointer = snd_usb_pcm_pointer,
1792 .page = snd_pcm_lib_get_vmalloc_page,
1795 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1796 .open = snd_usb_pcm_open,
1797 .close = snd_usb_pcm_close,
1798 .ioctl = snd_pcm_lib_ioctl,
1799 .hw_params = snd_usb_hw_params,
1800 .hw_free = snd_usb_hw_free,
1801 .prepare = snd_usb_pcm_prepare,
1802 .trigger = snd_usb_substream_playback_trigger,
1803 .pointer = snd_usb_pcm_pointer,
1804 .page = snd_pcm_sgbuf_ops_page,
1807 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1808 .open = snd_usb_pcm_open,
1809 .close = snd_usb_pcm_close,
1810 .ioctl = snd_pcm_lib_ioctl,
1811 .hw_params = snd_usb_hw_params,
1812 .hw_free = snd_usb_hw_free,
1813 .prepare = snd_usb_pcm_prepare,
1814 .trigger = snd_usb_substream_capture_trigger,
1815 .pointer = snd_usb_pcm_pointer,
1816 .page = snd_pcm_sgbuf_ops_page,
1819 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1821 const struct snd_pcm_ops *ops;
1823 if (snd_usb_use_vmalloc)
1824 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1825 &snd_usb_playback_ops : &snd_usb_capture_ops;
1827 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1828 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1829 snd_pcm_set_ops(pcm, stream, ops);
1832 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1834 struct snd_pcm *pcm = subs->stream->pcm;
1835 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1836 struct device *dev = subs->dev->bus->controller;
1838 if (!snd_usb_use_vmalloc)
1839 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1840 dev, 64*1024, 512*1024);