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;
351 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
352 /* BOSS Katana amplifiers do not need quirks */
356 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
357 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
358 altsd->bInterfaceProtocol == 2 &&
359 altsd->bNumEndpoints == 1 &&
360 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
361 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
362 altsd->bAlternateSetting,
370 add_sync_ep_from_ifnum:
371 iface = usb_ifnum_to_if(dev, ifnum);
373 if (!iface || iface->num_altsetting == 0)
376 alts = &iface->altsetting[1];
379 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
380 alts, ep, !subs->direction,
381 SND_USB_ENDPOINT_TYPE_DATA);
382 if (!subs->sync_endpoint)
385 subs->data_endpoint->sync_master = subs->sync_endpoint;
390 static int set_sync_endpoint(struct snd_usb_substream *subs,
391 struct audioformat *fmt,
392 struct usb_device *dev,
393 struct usb_host_interface *alts,
394 struct usb_interface_descriptor *altsd)
396 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
397 unsigned int ep, attr;
401 /* we need a sync pipe in async OUT or adaptive IN mode */
402 /* check the number of EP, since some devices have broken
403 * descriptors which fool us. if it has only one EP,
404 * assume it as adaptive-out or sync-in.
406 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
408 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
409 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
412 * In these modes the notion of sync_endpoint is irrelevant.
413 * Reset pointers to avoid using stale data from previously
414 * used settings, e.g. when configuration and endpoints were
418 subs->sync_endpoint = NULL;
419 subs->data_endpoint->sync_master = NULL;
422 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
426 /* endpoint set by quirk */
430 if (altsd->bNumEndpoints < 2)
433 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
434 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
435 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
439 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
440 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
441 * error fall back to SYNC mode and don't create sync endpoint
444 /* check sync-pipe endpoint */
445 /* ... and check descriptor size before accessing bSynchAddress
446 because there is a version of the SB Audigy 2 NX firmware lacking
447 the audio fields in the endpoint descriptors */
448 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
449 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
450 get_endpoint(alts, 1)->bSynchAddress != 0)) {
452 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
453 fmt->iface, fmt->altsetting,
454 get_endpoint(alts, 1)->bmAttributes,
455 get_endpoint(alts, 1)->bLength,
456 get_endpoint(alts, 1)->bSynchAddress);
457 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
461 ep = get_endpoint(alts, 1)->bEndpointAddress;
462 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
463 get_endpoint(alts, 0)->bSynchAddress != 0 &&
464 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
465 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
467 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
468 fmt->iface, fmt->altsetting,
469 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
470 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
475 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
476 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
478 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
479 alts, ep, !subs->direction,
481 SND_USB_ENDPOINT_TYPE_DATA :
482 SND_USB_ENDPOINT_TYPE_SYNC);
483 if (!subs->sync_endpoint) {
484 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
489 subs->data_endpoint->sync_master = subs->sync_endpoint;
495 * find a matching format and set up the interface
497 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
499 struct usb_device *dev = subs->dev;
500 struct usb_host_interface *alts;
501 struct usb_interface_descriptor *altsd;
502 struct usb_interface *iface;
505 iface = usb_ifnum_to_if(dev, fmt->iface);
508 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
509 altsd = get_iface_desc(alts);
510 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
513 if (fmt == subs->cur_audiofmt)
516 /* close the old interface */
517 if (subs->interface >= 0 && subs->interface != fmt->iface) {
518 if (!subs->stream->chip->keep_iface) {
519 err = usb_set_interface(subs->dev, subs->interface, 0);
522 "%d:%d: return to setting 0 failed (%d)\n",
523 fmt->iface, fmt->altsetting, err);
527 subs->interface = -1;
528 subs->altset_idx = 0;
532 if (iface->cur_altsetting != alts) {
533 err = snd_usb_select_mode_quirk(subs, fmt);
537 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
540 "%d:%d: usb_set_interface failed (%d)\n",
541 fmt->iface, fmt->altsetting, err);
544 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
545 fmt->iface, fmt->altsetting);
546 snd_usb_set_interface_quirk(dev);
549 subs->interface = fmt->iface;
550 subs->altset_idx = fmt->altset_idx;
551 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
552 alts, fmt->endpoint, subs->direction,
553 SND_USB_ENDPOINT_TYPE_DATA);
555 if (!subs->data_endpoint)
558 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
562 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
566 subs->cur_audiofmt = fmt;
568 snd_usb_set_format_quirk(subs, fmt);
574 * Return the score of matching two audioformats.
575 * Veto the audioformat if:
576 * - It has no channels for some reason.
577 * - Requested PCM format is not supported.
578 * - Requested sample rate is not supported.
580 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
581 struct audioformat *fp,
582 struct audioformat *match, int rate,
583 snd_pcm_format_t pcm_format)
588 if (fp->channels < 1) {
589 dev_dbg(&subs->dev->dev,
590 "%s: (fmt @%p) no channels\n", __func__, fp);
594 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
595 dev_dbg(&subs->dev->dev,
596 "%s: (fmt @%p) no match for format %d\n", __func__,
601 for (i = 0; i < fp->nr_rates; i++) {
602 if (fp->rate_table[i] == rate) {
608 dev_dbg(&subs->dev->dev,
609 "%s: (fmt @%p) no match for rate %d\n", __func__,
614 if (fp->channels == match->channels)
617 dev_dbg(&subs->dev->dev,
618 "%s: (fmt @%p) score %d\n", __func__, fp, score);
624 * Configure the sync ep using the rate and pcm format of the data ep.
626 static int configure_sync_endpoint(struct snd_usb_substream *subs)
629 struct audioformat *fp;
630 struct audioformat *sync_fp = NULL;
632 int sync_period_bytes = subs->period_bytes;
633 struct snd_usb_substream *sync_subs =
634 &subs->stream->substream[subs->direction ^ 1];
636 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
638 return snd_usb_endpoint_set_params(subs->sync_endpoint,
647 /* Try to find the best matching audioformat. */
648 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
649 int score = match_endpoint_audioformats(subs,
650 fp, subs->cur_audiofmt,
651 subs->cur_rate, subs->pcm_format);
653 if (score > cur_score) {
659 if (unlikely(sync_fp == NULL)) {
660 dev_err(&subs->dev->dev,
661 "%s: no valid audioformat for sync ep %x found\n",
662 __func__, sync_subs->ep_num);
667 * Recalculate the period bytes if channel number differ between
668 * data and sync ep audioformat.
670 if (sync_fp->channels != subs->channels) {
671 sync_period_bytes = (subs->period_bytes / subs->channels) *
673 dev_dbg(&subs->dev->dev,
674 "%s: adjusted sync ep period bytes (%d -> %d)\n",
675 __func__, subs->period_bytes, sync_period_bytes);
678 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
691 * configure endpoint params
693 * called during initial setup and upon resume
695 static int configure_endpoint(struct snd_usb_substream *subs)
700 stop_endpoints(subs, true);
701 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
706 subs->buffer_periods,
709 subs->sync_endpoint);
713 if (subs->sync_endpoint)
714 ret = configure_sync_endpoint(subs);
719 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
726 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
728 dev_err(&subs->dev->dev,
729 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
730 subs->str_pd->pd_id, state, ret);
737 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
741 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
745 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
752 int snd_usb_pcm_resume(struct snd_usb_stream *as)
756 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
760 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
770 * allocate a buffer and set the given audio format.
772 * so far we use a physically linear buffer although packetize transfer
773 * doesn't need a continuous area.
774 * if sg buffer is supported on the later version of alsa, we'll follow
777 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
778 struct snd_pcm_hw_params *hw_params)
780 struct snd_usb_substream *subs = substream->runtime->private_data;
781 struct audioformat *fmt;
784 ret = snd_media_start_pipeline(subs);
788 if (snd_usb_use_vmalloc)
789 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
790 params_buffer_bytes(hw_params));
792 ret = snd_pcm_lib_malloc_pages(substream,
793 params_buffer_bytes(hw_params));
797 subs->pcm_format = params_format(hw_params);
798 subs->period_bytes = params_period_bytes(hw_params);
799 subs->period_frames = params_period_size(hw_params);
800 subs->buffer_periods = params_periods(hw_params);
801 subs->channels = params_channels(hw_params);
802 subs->cur_rate = params_rate(hw_params);
804 fmt = find_format(subs);
806 dev_dbg(&subs->dev->dev,
807 "cannot set format: format = %#x, rate = %d, channels = %d\n",
808 subs->pcm_format, subs->cur_rate, subs->channels);
813 ret = snd_usb_lock_shutdown(subs->stream->chip);
817 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
821 ret = set_format(subs, fmt);
825 subs->interface = fmt->iface;
826 subs->altset_idx = fmt->altset_idx;
827 subs->need_setup_ep = true;
830 snd_usb_unlock_shutdown(subs->stream->chip);
836 snd_media_stop_pipeline(subs);
843 * reset the audio format and release the buffer
845 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
847 struct snd_usb_substream *subs = substream->runtime->private_data;
849 snd_media_stop_pipeline(subs);
850 subs->cur_audiofmt = NULL;
852 subs->period_bytes = 0;
853 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
854 stop_endpoints(subs, true);
855 snd_usb_endpoint_deactivate(subs->sync_endpoint);
856 snd_usb_endpoint_deactivate(subs->data_endpoint);
857 snd_usb_unlock_shutdown(subs->stream->chip);
860 if (snd_usb_use_vmalloc)
861 return snd_pcm_lib_free_vmalloc_buffer(substream);
863 return snd_pcm_lib_free_pages(substream);
869 * only a few subtle things...
871 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
873 struct snd_pcm_runtime *runtime = substream->runtime;
874 struct snd_usb_substream *subs = runtime->private_data;
875 struct usb_host_interface *alts;
876 struct usb_interface *iface;
879 if (! subs->cur_audiofmt) {
880 dev_err(&subs->dev->dev, "no format is specified!\n");
884 ret = snd_usb_lock_shutdown(subs->stream->chip);
887 if (snd_BUG_ON(!subs->data_endpoint)) {
892 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
893 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
895 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
899 ret = set_format(subs, subs->cur_audiofmt);
903 if (subs->need_setup_ep) {
905 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
906 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
907 ret = snd_usb_init_sample_rate(subs->stream->chip,
908 subs->cur_audiofmt->iface,
915 ret = configure_endpoint(subs);
918 subs->need_setup_ep = false;
921 /* some unit conversions in runtime */
922 subs->data_endpoint->maxframesize =
923 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
924 subs->data_endpoint->curframesize =
925 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
927 /* reset the pointer */
928 subs->hwptr_done = 0;
929 subs->transfer_done = 0;
930 subs->last_delay = 0;
931 subs->last_frame_number = 0;
934 /* for playback, submit the URBs now; otherwise, the first hwptr_done
935 * updates for all URBs would happen at the same time when starting */
936 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
937 ret = start_endpoints(subs);
940 snd_usb_unlock_shutdown(subs->stream->chip);
944 static const struct snd_pcm_hardware snd_usb_hardware =
946 .info = SNDRV_PCM_INFO_MMAP |
947 SNDRV_PCM_INFO_MMAP_VALID |
948 SNDRV_PCM_INFO_BATCH |
949 SNDRV_PCM_INFO_INTERLEAVED |
950 SNDRV_PCM_INFO_BLOCK_TRANSFER |
951 SNDRV_PCM_INFO_PAUSE,
952 .buffer_bytes_max = 1024 * 1024,
953 .period_bytes_min = 64,
954 .period_bytes_max = 512 * 1024,
959 static int hw_check_valid_format(struct snd_usb_substream *subs,
960 struct snd_pcm_hw_params *params,
961 struct audioformat *fp)
963 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
964 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
965 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
966 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
967 struct snd_mask check_fmts;
970 /* check the format */
971 snd_mask_none(&check_fmts);
972 check_fmts.bits[0] = (u32)fp->formats;
973 check_fmts.bits[1] = (u32)(fp->formats >> 32);
974 snd_mask_intersect(&check_fmts, fmts);
975 if (snd_mask_empty(&check_fmts)) {
976 hwc_debug(" > check: no supported format %d\n", fp->format);
979 /* check the channels */
980 if (fp->channels < ct->min || fp->channels > ct->max) {
981 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
984 /* check the rate is within the range */
985 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
986 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
989 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
990 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
993 /* check whether the period time is >= the data packet interval */
994 if (subs->speed != USB_SPEED_FULL) {
995 ptime = 125 * (1 << fp->datainterval);
996 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
997 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1004 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1005 struct snd_pcm_hw_rule *rule)
1007 struct snd_usb_substream *subs = rule->private;
1008 struct audioformat *fp;
1009 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1010 unsigned int rmin, rmax;
1013 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1016 list_for_each_entry(fp, &subs->fmt_list, list) {
1017 if (!hw_check_valid_format(subs, params, fp))
1020 if (rmin > fp->rate_min)
1021 rmin = fp->rate_min;
1022 if (rmax < fp->rate_max)
1023 rmax = fp->rate_max;
1025 rmin = fp->rate_min;
1026 rmax = fp->rate_max;
1031 hwc_debug(" --> get empty\n");
1037 if (it->min < rmin) {
1042 if (it->max > rmax) {
1047 if (snd_interval_checkempty(it)) {
1051 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1056 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1057 struct snd_pcm_hw_rule *rule)
1059 struct snd_usb_substream *subs = rule->private;
1060 struct audioformat *fp;
1061 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1062 unsigned int rmin, rmax;
1065 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1068 list_for_each_entry(fp, &subs->fmt_list, list) {
1069 if (!hw_check_valid_format(subs, params, fp))
1072 if (rmin > fp->channels)
1073 rmin = fp->channels;
1074 if (rmax < fp->channels)
1075 rmax = fp->channels;
1077 rmin = fp->channels;
1078 rmax = fp->channels;
1083 hwc_debug(" --> get empty\n");
1089 if (it->min < rmin) {
1094 if (it->max > rmax) {
1099 if (snd_interval_checkempty(it)) {
1103 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1107 static int hw_rule_format(struct snd_pcm_hw_params *params,
1108 struct snd_pcm_hw_rule *rule)
1110 struct snd_usb_substream *subs = rule->private;
1111 struct audioformat *fp;
1112 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1117 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1119 list_for_each_entry(fp, &subs->fmt_list, list) {
1120 if (!hw_check_valid_format(subs, params, fp))
1122 fbits |= fp->formats;
1125 oldbits[0] = fmt->bits[0];
1126 oldbits[1] = fmt->bits[1];
1127 fmt->bits[0] &= (u32)fbits;
1128 fmt->bits[1] &= (u32)(fbits >> 32);
1129 if (!fmt->bits[0] && !fmt->bits[1]) {
1130 hwc_debug(" --> get empty\n");
1133 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1134 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1138 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1139 struct snd_pcm_hw_rule *rule)
1141 struct snd_usb_substream *subs = rule->private;
1142 struct audioformat *fp;
1143 struct snd_interval *it;
1144 unsigned char min_datainterval;
1148 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1149 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1150 min_datainterval = 0xff;
1151 list_for_each_entry(fp, &subs->fmt_list, list) {
1152 if (!hw_check_valid_format(subs, params, fp))
1154 min_datainterval = min(min_datainterval, fp->datainterval);
1156 if (min_datainterval == 0xff) {
1157 hwc_debug(" --> get empty\n");
1161 pmin = 125 * (1 << min_datainterval);
1163 if (it->min < pmin) {
1168 if (snd_interval_checkempty(it)) {
1172 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1177 * If the device supports unusual bit rates, does the request meet these?
1179 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1180 struct snd_usb_substream *subs)
1182 struct audioformat *fp;
1184 int count = 0, needs_knot = 0;
1187 kfree(subs->rate_list.list);
1188 subs->rate_list.list = NULL;
1190 list_for_each_entry(fp, &subs->fmt_list, list) {
1191 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1193 count += fp->nr_rates;
1194 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1200 subs->rate_list.list = rate_list =
1201 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1202 if (!subs->rate_list.list)
1204 subs->rate_list.count = count;
1205 subs->rate_list.mask = 0;
1207 list_for_each_entry(fp, &subs->fmt_list, list) {
1209 for (i = 0; i < fp->nr_rates; i++)
1210 rate_list[count++] = fp->rate_table[i];
1212 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1222 * set up the runtime hardware information.
1225 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1227 struct audioformat *fp;
1228 unsigned int pt, ptmin;
1229 int param_period_time_if_needed;
1232 runtime->hw.formats = subs->formats;
1234 runtime->hw.rate_min = 0x7fffffff;
1235 runtime->hw.rate_max = 0;
1236 runtime->hw.channels_min = 256;
1237 runtime->hw.channels_max = 0;
1238 runtime->hw.rates = 0;
1240 /* check min/max rates and channels */
1241 list_for_each_entry(fp, &subs->fmt_list, list) {
1242 runtime->hw.rates |= fp->rates;
1243 if (runtime->hw.rate_min > fp->rate_min)
1244 runtime->hw.rate_min = fp->rate_min;
1245 if (runtime->hw.rate_max < fp->rate_max)
1246 runtime->hw.rate_max = fp->rate_max;
1247 if (runtime->hw.channels_min > fp->channels)
1248 runtime->hw.channels_min = fp->channels;
1249 if (runtime->hw.channels_max < fp->channels)
1250 runtime->hw.channels_max = fp->channels;
1251 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1252 /* FIXME: there might be more than one audio formats... */
1253 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1256 pt = 125 * (1 << fp->datainterval);
1257 ptmin = min(ptmin, pt);
1260 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1261 if (subs->speed == USB_SPEED_FULL)
1262 /* full speed devices have fixed data packet interval */
1265 /* if period time doesn't go below 1 ms, no rules needed */
1266 param_period_time_if_needed = -1;
1268 err = snd_pcm_hw_constraint_minmax(runtime,
1269 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1274 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1276 SNDRV_PCM_HW_PARAM_FORMAT,
1277 SNDRV_PCM_HW_PARAM_CHANNELS,
1278 param_period_time_if_needed,
1282 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1283 hw_rule_channels, subs,
1284 SNDRV_PCM_HW_PARAM_FORMAT,
1285 SNDRV_PCM_HW_PARAM_RATE,
1286 param_period_time_if_needed,
1290 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1291 hw_rule_format, subs,
1292 SNDRV_PCM_HW_PARAM_RATE,
1293 SNDRV_PCM_HW_PARAM_CHANNELS,
1294 param_period_time_if_needed,
1298 if (param_period_time_if_needed >= 0) {
1299 err = snd_pcm_hw_rule_add(runtime, 0,
1300 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1301 hw_rule_period_time, subs,
1302 SNDRV_PCM_HW_PARAM_FORMAT,
1303 SNDRV_PCM_HW_PARAM_CHANNELS,
1304 SNDRV_PCM_HW_PARAM_RATE,
1309 err = snd_usb_pcm_check_knot(runtime, subs);
1313 return snd_usb_autoresume(subs->stream->chip);
1316 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1318 int direction = substream->stream;
1319 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1320 struct snd_pcm_runtime *runtime = substream->runtime;
1321 struct snd_usb_substream *subs = &as->substream[direction];
1324 subs->interface = -1;
1325 subs->altset_idx = 0;
1326 runtime->hw = snd_usb_hardware;
1327 runtime->private_data = subs;
1328 subs->pcm_substream = substream;
1329 /* runtime PM is also done there */
1331 /* initialize DSD/DOP context */
1332 subs->dsd_dop.byte_idx = 0;
1333 subs->dsd_dop.channel = 0;
1334 subs->dsd_dop.marker = 1;
1336 ret = setup_hw_info(runtime, subs);
1338 ret = snd_media_stream_init(subs, as->pcm, direction);
1340 snd_usb_autosuspend(subs->stream->chip);
1345 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1347 int direction = substream->stream;
1348 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1349 struct snd_usb_substream *subs = &as->substream[direction];
1352 stop_endpoints(subs, true);
1353 snd_media_stop_pipeline(subs);
1355 if (!as->chip->keep_iface &&
1356 subs->interface >= 0 &&
1357 !snd_usb_lock_shutdown(subs->stream->chip)) {
1358 usb_set_interface(subs->dev, subs->interface, 0);
1359 subs->interface = -1;
1360 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1361 snd_usb_unlock_shutdown(subs->stream->chip);
1366 subs->pcm_substream = NULL;
1367 snd_usb_autosuspend(subs->stream->chip);
1372 /* Since a URB can handle only a single linear buffer, we must use double
1373 * buffering when the data to be transferred overflows the buffer boundary.
1374 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1377 static void retire_capture_urb(struct snd_usb_substream *subs,
1380 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1381 unsigned int stride, frames, bytes, oldptr;
1382 int i, period_elapsed = 0;
1383 unsigned long flags;
1385 int current_frame_number;
1387 /* read frame number here, update pointer in critical section */
1388 current_frame_number = usb_get_current_frame_number(subs->dev);
1390 stride = runtime->frame_bits >> 3;
1392 for (i = 0; i < urb->number_of_packets; i++) {
1393 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1394 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1395 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1396 i, urb->iso_frame_desc[i].status);
1399 bytes = urb->iso_frame_desc[i].actual_length;
1400 frames = bytes / stride;
1401 if (!subs->txfr_quirk)
1402 bytes = frames * stride;
1403 if (bytes % (runtime->sample_bits >> 3) != 0) {
1404 int oldbytes = bytes;
1405 bytes = frames * stride;
1406 dev_warn_ratelimited(&subs->dev->dev,
1407 "Corrected urb data len. %d->%d\n",
1410 /* update the current pointer */
1411 spin_lock_irqsave(&subs->lock, flags);
1412 oldptr = subs->hwptr_done;
1413 subs->hwptr_done += bytes;
1414 if (subs->hwptr_done >= runtime->buffer_size * stride)
1415 subs->hwptr_done -= runtime->buffer_size * stride;
1416 frames = (bytes + (oldptr % stride)) / stride;
1417 subs->transfer_done += frames;
1418 if (subs->transfer_done >= runtime->period_size) {
1419 subs->transfer_done -= runtime->period_size;
1422 /* capture delay is by construction limited to one URB,
1425 runtime->delay = subs->last_delay = 0;
1427 /* realign last_frame_number */
1428 subs->last_frame_number = current_frame_number;
1429 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1431 spin_unlock_irqrestore(&subs->lock, flags);
1432 /* copy a data chunk */
1433 if (oldptr + bytes > runtime->buffer_size * stride) {
1434 unsigned int bytes1 =
1435 runtime->buffer_size * stride - oldptr;
1436 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1437 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1439 memcpy(runtime->dma_area + oldptr, cp, bytes);
1444 snd_pcm_period_elapsed(subs->pcm_substream);
1447 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1448 struct urb *urb, unsigned int bytes)
1450 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1451 unsigned int stride = runtime->frame_bits >> 3;
1452 unsigned int dst_idx = 0;
1453 unsigned int src_idx = subs->hwptr_done;
1454 unsigned int wrap = runtime->buffer_size * stride;
1455 u8 *dst = urb->transfer_buffer;
1456 u8 *src = runtime->dma_area;
1457 u8 marker[] = { 0x05, 0xfa };
1460 * The DSP DOP format defines a way to transport DSD samples over
1461 * normal PCM data endpoints. It requires stuffing of marker bytes
1462 * (0x05 and 0xfa, alternating per sample frame), and then expects
1463 * 2 additional bytes of actual payload. The whole frame is stored
1466 * Hence, for a stereo transport, the buffer layout looks like this,
1467 * where L refers to left channel samples and R to right.
1469 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1470 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1476 if (++subs->dsd_dop.byte_idx == 3) {
1477 /* frame boundary? */
1478 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1480 subs->dsd_dop.byte_idx = 0;
1482 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1483 /* alternate the marker */
1484 subs->dsd_dop.marker++;
1485 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1486 subs->dsd_dop.channel = 0;
1489 /* stuff the DSD payload */
1490 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1492 if (subs->cur_audiofmt->dsd_bitrev)
1493 dst[dst_idx++] = bitrev8(src[idx]);
1495 dst[dst_idx++] = src[idx];
1500 if (subs->hwptr_done >= runtime->buffer_size * stride)
1501 subs->hwptr_done -= runtime->buffer_size * stride;
1504 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1505 int offset, int stride, unsigned int bytes)
1507 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1509 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1510 /* err, the transferred area goes over buffer boundary. */
1511 unsigned int bytes1 =
1512 runtime->buffer_size * stride - subs->hwptr_done;
1513 memcpy(urb->transfer_buffer + offset,
1514 runtime->dma_area + subs->hwptr_done, bytes1);
1515 memcpy(urb->transfer_buffer + offset + bytes1,
1516 runtime->dma_area, bytes - bytes1);
1518 memcpy(urb->transfer_buffer + offset,
1519 runtime->dma_area + subs->hwptr_done, bytes);
1521 subs->hwptr_done += bytes;
1522 if (subs->hwptr_done >= runtime->buffer_size * stride)
1523 subs->hwptr_done -= runtime->buffer_size * stride;
1526 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1527 struct urb *urb, int stride,
1530 __le32 packet_length;
1533 /* Put __le32 length descriptor at start of each packet. */
1534 for (i = 0; i < urb->number_of_packets; i++) {
1535 unsigned int length = urb->iso_frame_desc[i].length;
1536 unsigned int offset = urb->iso_frame_desc[i].offset;
1538 packet_length = cpu_to_le32(length);
1539 offset += i * sizeof(packet_length);
1540 urb->iso_frame_desc[i].offset = offset;
1541 urb->iso_frame_desc[i].length += sizeof(packet_length);
1542 memcpy(urb->transfer_buffer + offset,
1543 &packet_length, sizeof(packet_length));
1544 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1547 /* Adjust transfer size accordingly. */
1548 bytes += urb->number_of_packets * sizeof(packet_length);
1552 static void prepare_playback_urb(struct snd_usb_substream *subs,
1555 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1556 struct snd_usb_endpoint *ep = subs->data_endpoint;
1557 struct snd_urb_ctx *ctx = urb->context;
1558 unsigned int counts, frames, bytes;
1559 int i, stride, period_elapsed = 0;
1560 unsigned long flags;
1562 stride = runtime->frame_bits >> 3;
1565 urb->number_of_packets = 0;
1566 spin_lock_irqsave(&subs->lock, flags);
1567 subs->frame_limit += ep->max_urb_frames;
1568 for (i = 0; i < ctx->packets; i++) {
1569 if (ctx->packet_size[i])
1570 counts = ctx->packet_size[i];
1572 counts = snd_usb_endpoint_next_packet_size(ep);
1574 /* set up descriptor */
1575 urb->iso_frame_desc[i].offset = frames * ep->stride;
1576 urb->iso_frame_desc[i].length = counts * ep->stride;
1578 urb->number_of_packets++;
1579 subs->transfer_done += counts;
1580 if (subs->transfer_done >= runtime->period_size) {
1581 subs->transfer_done -= runtime->period_size;
1582 subs->frame_limit = 0;
1584 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1585 if (subs->transfer_done > 0) {
1586 /* FIXME: fill-max mode is not
1588 frames -= subs->transfer_done;
1589 counts -= subs->transfer_done;
1590 urb->iso_frame_desc[i].length =
1591 counts * ep->stride;
1592 subs->transfer_done = 0;
1595 if (i < ctx->packets) {
1596 /* add a transfer delimiter */
1597 urb->iso_frame_desc[i].offset =
1598 frames * ep->stride;
1599 urb->iso_frame_desc[i].length = 0;
1600 urb->number_of_packets++;
1605 /* finish at the period boundary or after enough frames */
1606 if ((period_elapsed ||
1607 subs->transfer_done >= subs->frame_limit) &&
1608 !snd_usb_endpoint_implicit_feedback_sink(ep))
1611 bytes = frames * ep->stride;
1613 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1614 subs->cur_audiofmt->dsd_dop)) {
1615 fill_playback_urb_dsd_dop(subs, urb, bytes);
1616 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1617 subs->cur_audiofmt->dsd_bitrev)) {
1618 /* bit-reverse the bytes */
1619 u8 *buf = urb->transfer_buffer;
1620 for (i = 0; i < bytes; i++) {
1621 int idx = (subs->hwptr_done + i)
1622 % (runtime->buffer_size * stride);
1623 buf[i] = bitrev8(runtime->dma_area[idx]);
1626 subs->hwptr_done += bytes;
1627 if (subs->hwptr_done >= runtime->buffer_size * stride)
1628 subs->hwptr_done -= runtime->buffer_size * stride;
1631 if (!subs->tx_length_quirk)
1632 copy_to_urb(subs, urb, 0, stride, bytes);
1634 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1635 /* bytes is now amount of outgoing data */
1638 /* update delay with exact number of samples queued */
1639 runtime->delay = subs->last_delay;
1640 runtime->delay += frames;
1641 subs->last_delay = runtime->delay;
1643 /* realign last_frame_number */
1644 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1645 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1647 if (subs->trigger_tstamp_pending_update) {
1648 /* this is the first actual URB submitted,
1649 * update trigger timestamp to reflect actual start time
1651 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1652 subs->trigger_tstamp_pending_update = false;
1655 spin_unlock_irqrestore(&subs->lock, flags);
1656 urb->transfer_buffer_length = bytes;
1658 snd_pcm_period_elapsed(subs->pcm_substream);
1662 * process after playback data complete
1663 * - decrease the delay count again
1665 static void retire_playback_urb(struct snd_usb_substream *subs,
1668 unsigned long flags;
1669 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1670 struct snd_usb_endpoint *ep = subs->data_endpoint;
1671 int processed = urb->transfer_buffer_length / ep->stride;
1674 /* ignore the delay accounting when procssed=0 is given, i.e.
1675 * silent payloads are procssed before handling the actual data
1680 spin_lock_irqsave(&subs->lock, flags);
1681 if (!subs->last_delay)
1682 goto out; /* short path */
1684 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1685 /* update delay with exact number of samples played */
1686 if (processed > subs->last_delay)
1687 subs->last_delay = 0;
1689 subs->last_delay -= processed;
1690 runtime->delay = subs->last_delay;
1693 * Report when delay estimate is off by more than 2ms.
1694 * The error should be lower than 2ms since the estimate relies
1695 * on two reads of a counter updated every ms.
1697 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1698 dev_dbg_ratelimited(&subs->dev->dev,
1699 "delay: estimated %d, actual %d\n",
1700 est_delay, subs->last_delay);
1702 if (!subs->running) {
1703 /* update last_frame_number for delay counting here since
1704 * prepare_playback_urb won't be called during pause
1706 subs->last_frame_number =
1707 usb_get_current_frame_number(subs->dev) & 0xff;
1711 spin_unlock_irqrestore(&subs->lock, flags);
1714 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1717 struct snd_usb_substream *subs = substream->runtime->private_data;
1720 case SNDRV_PCM_TRIGGER_START:
1721 subs->trigger_tstamp_pending_update = true;
1723 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1724 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1725 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1728 case SNDRV_PCM_TRIGGER_STOP:
1729 stop_endpoints(subs, false);
1732 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1733 subs->data_endpoint->prepare_data_urb = NULL;
1734 /* keep retire_data_urb for delay calculation */
1735 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1743 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1747 struct snd_usb_substream *subs = substream->runtime->private_data;
1750 case SNDRV_PCM_TRIGGER_START:
1751 err = start_endpoints(subs);
1755 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1758 case SNDRV_PCM_TRIGGER_STOP:
1759 stop_endpoints(subs, false);
1762 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1763 subs->data_endpoint->retire_data_urb = NULL;
1766 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1767 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1775 static const struct snd_pcm_ops snd_usb_playback_ops = {
1776 .open = snd_usb_pcm_open,
1777 .close = snd_usb_pcm_close,
1778 .ioctl = snd_pcm_lib_ioctl,
1779 .hw_params = snd_usb_hw_params,
1780 .hw_free = snd_usb_hw_free,
1781 .prepare = snd_usb_pcm_prepare,
1782 .trigger = snd_usb_substream_playback_trigger,
1783 .pointer = snd_usb_pcm_pointer,
1784 .page = snd_pcm_lib_get_vmalloc_page,
1787 static const struct snd_pcm_ops snd_usb_capture_ops = {
1788 .open = snd_usb_pcm_open,
1789 .close = snd_usb_pcm_close,
1790 .ioctl = snd_pcm_lib_ioctl,
1791 .hw_params = snd_usb_hw_params,
1792 .hw_free = snd_usb_hw_free,
1793 .prepare = snd_usb_pcm_prepare,
1794 .trigger = snd_usb_substream_capture_trigger,
1795 .pointer = snd_usb_pcm_pointer,
1796 .page = snd_pcm_lib_get_vmalloc_page,
1799 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1800 .open = snd_usb_pcm_open,
1801 .close = snd_usb_pcm_close,
1802 .ioctl = snd_pcm_lib_ioctl,
1803 .hw_params = snd_usb_hw_params,
1804 .hw_free = snd_usb_hw_free,
1805 .prepare = snd_usb_pcm_prepare,
1806 .trigger = snd_usb_substream_playback_trigger,
1807 .pointer = snd_usb_pcm_pointer,
1808 .page = snd_pcm_sgbuf_ops_page,
1811 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1812 .open = snd_usb_pcm_open,
1813 .close = snd_usb_pcm_close,
1814 .ioctl = snd_pcm_lib_ioctl,
1815 .hw_params = snd_usb_hw_params,
1816 .hw_free = snd_usb_hw_free,
1817 .prepare = snd_usb_pcm_prepare,
1818 .trigger = snd_usb_substream_capture_trigger,
1819 .pointer = snd_usb_pcm_pointer,
1820 .page = snd_pcm_sgbuf_ops_page,
1823 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1825 const struct snd_pcm_ops *ops;
1827 if (snd_usb_use_vmalloc)
1828 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1829 &snd_usb_playback_ops : &snd_usb_capture_ops;
1831 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1832 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1833 snd_pcm_set_ops(pcm, stream, ops);
1836 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1838 struct snd_pcm *pcm = subs->stream->pcm;
1839 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1840 struct device *dev = subs->dev->bus->controller;
1842 if (!snd_usb_use_vmalloc)
1843 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1844 dev, 64*1024, 512*1024);