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, 0x0002): /* Behringer UFX1204 */
345 goto add_sync_ep_from_ifnum;
346 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
349 goto add_sync_ep_from_ifnum;
352 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
353 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
354 altsd->bInterfaceProtocol == 2 &&
355 altsd->bNumEndpoints == 1 &&
356 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
357 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
358 altsd->bAlternateSetting,
366 add_sync_ep_from_ifnum:
367 iface = usb_ifnum_to_if(dev, ifnum);
369 if (!iface || iface->num_altsetting == 0)
372 alts = &iface->altsetting[1];
375 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
376 alts, ep, !subs->direction,
377 SND_USB_ENDPOINT_TYPE_DATA);
378 if (!subs->sync_endpoint)
381 subs->data_endpoint->sync_master = subs->sync_endpoint;
386 static int set_sync_endpoint(struct snd_usb_substream *subs,
387 struct audioformat *fmt,
388 struct usb_device *dev,
389 struct usb_host_interface *alts,
390 struct usb_interface_descriptor *altsd)
392 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
393 unsigned int ep, attr;
397 /* we need a sync pipe in async OUT or adaptive IN mode */
398 /* check the number of EP, since some devices have broken
399 * descriptors which fool us. if it has only one EP,
400 * assume it as adaptive-out or sync-in.
402 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
404 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
405 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
408 * In these modes the notion of sync_endpoint is irrelevant.
409 * Reset pointers to avoid using stale data from previously
410 * used settings, e.g. when configuration and endpoints were
414 subs->sync_endpoint = NULL;
415 subs->data_endpoint->sync_master = NULL;
418 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
422 /* endpoint set by quirk */
426 if (altsd->bNumEndpoints < 2)
429 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
430 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
431 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
435 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
436 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
437 * error fall back to SYNC mode and don't create sync endpoint
440 /* check sync-pipe endpoint */
441 /* ... and check descriptor size before accessing bSynchAddress
442 because there is a version of the SB Audigy 2 NX firmware lacking
443 the audio fields in the endpoint descriptors */
444 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
445 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
446 get_endpoint(alts, 1)->bSynchAddress != 0)) {
448 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
449 fmt->iface, fmt->altsetting,
450 get_endpoint(alts, 1)->bmAttributes,
451 get_endpoint(alts, 1)->bLength,
452 get_endpoint(alts, 1)->bSynchAddress);
453 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
457 ep = get_endpoint(alts, 1)->bEndpointAddress;
458 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
459 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
460 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
462 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
463 fmt->iface, fmt->altsetting,
464 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
465 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
470 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
471 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
473 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
474 alts, ep, !subs->direction,
476 SND_USB_ENDPOINT_TYPE_DATA :
477 SND_USB_ENDPOINT_TYPE_SYNC);
478 if (!subs->sync_endpoint) {
479 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
484 subs->data_endpoint->sync_master = subs->sync_endpoint;
490 * find a matching format and set up the interface
492 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
494 struct usb_device *dev = subs->dev;
495 struct usb_host_interface *alts;
496 struct usb_interface_descriptor *altsd;
497 struct usb_interface *iface;
500 iface = usb_ifnum_to_if(dev, fmt->iface);
503 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
504 altsd = get_iface_desc(alts);
505 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
508 if (fmt == subs->cur_audiofmt)
511 /* close the old interface */
512 if (subs->interface >= 0 && subs->interface != fmt->iface) {
513 if (!subs->stream->chip->keep_iface) {
514 err = usb_set_interface(subs->dev, subs->interface, 0);
517 "%d:%d: return to setting 0 failed (%d)\n",
518 fmt->iface, fmt->altsetting, err);
522 subs->interface = -1;
523 subs->altset_idx = 0;
527 if (iface->cur_altsetting != alts) {
528 err = snd_usb_select_mode_quirk(subs, fmt);
532 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
535 "%d:%d: usb_set_interface failed (%d)\n",
536 fmt->iface, fmt->altsetting, err);
539 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
540 fmt->iface, fmt->altsetting);
541 snd_usb_set_interface_quirk(dev);
544 subs->interface = fmt->iface;
545 subs->altset_idx = fmt->altset_idx;
546 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
547 alts, fmt->endpoint, subs->direction,
548 SND_USB_ENDPOINT_TYPE_DATA);
550 if (!subs->data_endpoint)
553 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
557 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
561 subs->cur_audiofmt = fmt;
563 snd_usb_set_format_quirk(subs, fmt);
569 * Return the score of matching two audioformats.
570 * Veto the audioformat if:
571 * - It has no channels for some reason.
572 * - Requested PCM format is not supported.
573 * - Requested sample rate is not supported.
575 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
576 struct audioformat *fp,
577 struct audioformat *match, int rate,
578 snd_pcm_format_t pcm_format)
583 if (fp->channels < 1) {
584 dev_dbg(&subs->dev->dev,
585 "%s: (fmt @%p) no channels\n", __func__, fp);
589 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
590 dev_dbg(&subs->dev->dev,
591 "%s: (fmt @%p) no match for format %d\n", __func__,
596 for (i = 0; i < fp->nr_rates; i++) {
597 if (fp->rate_table[i] == rate) {
603 dev_dbg(&subs->dev->dev,
604 "%s: (fmt @%p) no match for rate %d\n", __func__,
609 if (fp->channels == match->channels)
612 dev_dbg(&subs->dev->dev,
613 "%s: (fmt @%p) score %d\n", __func__, fp, score);
619 * Configure the sync ep using the rate and pcm format of the data ep.
621 static int configure_sync_endpoint(struct snd_usb_substream *subs)
624 struct audioformat *fp;
625 struct audioformat *sync_fp = NULL;
627 int sync_period_bytes = subs->period_bytes;
628 struct snd_usb_substream *sync_subs =
629 &subs->stream->substream[subs->direction ^ 1];
631 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
633 return snd_usb_endpoint_set_params(subs->sync_endpoint,
642 /* Try to find the best matching audioformat. */
643 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
644 int score = match_endpoint_audioformats(subs,
645 fp, subs->cur_audiofmt,
646 subs->cur_rate, subs->pcm_format);
648 if (score > cur_score) {
654 if (unlikely(sync_fp == NULL)) {
655 dev_err(&subs->dev->dev,
656 "%s: no valid audioformat for sync ep %x found\n",
657 __func__, sync_subs->ep_num);
662 * Recalculate the period bytes if channel number differ between
663 * data and sync ep audioformat.
665 if (sync_fp->channels != subs->channels) {
666 sync_period_bytes = (subs->period_bytes / subs->channels) *
668 dev_dbg(&subs->dev->dev,
669 "%s: adjusted sync ep period bytes (%d -> %d)\n",
670 __func__, subs->period_bytes, sync_period_bytes);
673 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
686 * configure endpoint params
688 * called during initial setup and upon resume
690 static int configure_endpoint(struct snd_usb_substream *subs)
695 stop_endpoints(subs, true);
696 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
701 subs->buffer_periods,
704 subs->sync_endpoint);
708 if (subs->sync_endpoint)
709 ret = configure_sync_endpoint(subs);
714 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
721 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
723 dev_err(&subs->dev->dev,
724 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
725 subs->str_pd->pd_id, state, ret);
732 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
736 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
740 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
747 int snd_usb_pcm_resume(struct snd_usb_stream *as)
751 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
755 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
765 * allocate a buffer and set the given audio format.
767 * so far we use a physically linear buffer although packetize transfer
768 * doesn't need a continuous area.
769 * if sg buffer is supported on the later version of alsa, we'll follow
772 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
773 struct snd_pcm_hw_params *hw_params)
775 struct snd_usb_substream *subs = substream->runtime->private_data;
776 struct audioformat *fmt;
779 ret = snd_media_start_pipeline(subs);
783 if (snd_usb_use_vmalloc)
784 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
785 params_buffer_bytes(hw_params));
787 ret = snd_pcm_lib_malloc_pages(substream,
788 params_buffer_bytes(hw_params));
792 subs->pcm_format = params_format(hw_params);
793 subs->period_bytes = params_period_bytes(hw_params);
794 subs->period_frames = params_period_size(hw_params);
795 subs->buffer_periods = params_periods(hw_params);
796 subs->channels = params_channels(hw_params);
797 subs->cur_rate = params_rate(hw_params);
799 fmt = find_format(subs);
801 dev_dbg(&subs->dev->dev,
802 "cannot set format: format = %#x, rate = %d, channels = %d\n",
803 subs->pcm_format, subs->cur_rate, subs->channels);
808 ret = snd_usb_lock_shutdown(subs->stream->chip);
812 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
816 ret = set_format(subs, fmt);
820 subs->interface = fmt->iface;
821 subs->altset_idx = fmt->altset_idx;
822 subs->need_setup_ep = true;
825 snd_usb_unlock_shutdown(subs->stream->chip);
831 snd_media_stop_pipeline(subs);
838 * reset the audio format and release the buffer
840 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
842 struct snd_usb_substream *subs = substream->runtime->private_data;
844 snd_media_stop_pipeline(subs);
845 subs->cur_audiofmt = NULL;
847 subs->period_bytes = 0;
848 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
849 stop_endpoints(subs, true);
850 snd_usb_endpoint_deactivate(subs->sync_endpoint);
851 snd_usb_endpoint_deactivate(subs->data_endpoint);
852 snd_usb_unlock_shutdown(subs->stream->chip);
855 if (snd_usb_use_vmalloc)
856 return snd_pcm_lib_free_vmalloc_buffer(substream);
858 return snd_pcm_lib_free_pages(substream);
864 * only a few subtle things...
866 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
868 struct snd_pcm_runtime *runtime = substream->runtime;
869 struct snd_usb_substream *subs = runtime->private_data;
870 struct usb_host_interface *alts;
871 struct usb_interface *iface;
874 if (! subs->cur_audiofmt) {
875 dev_err(&subs->dev->dev, "no format is specified!\n");
879 ret = snd_usb_lock_shutdown(subs->stream->chip);
882 if (snd_BUG_ON(!subs->data_endpoint)) {
887 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
888 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
890 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
894 ret = set_format(subs, subs->cur_audiofmt);
898 if (subs->need_setup_ep) {
900 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
901 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
902 ret = snd_usb_init_sample_rate(subs->stream->chip,
903 subs->cur_audiofmt->iface,
910 ret = configure_endpoint(subs);
913 subs->need_setup_ep = false;
916 /* some unit conversions in runtime */
917 subs->data_endpoint->maxframesize =
918 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
919 subs->data_endpoint->curframesize =
920 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
922 /* reset the pointer */
923 subs->hwptr_done = 0;
924 subs->transfer_done = 0;
925 subs->last_delay = 0;
926 subs->last_frame_number = 0;
929 /* for playback, submit the URBs now; otherwise, the first hwptr_done
930 * updates for all URBs would happen at the same time when starting */
931 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
932 ret = start_endpoints(subs);
935 snd_usb_unlock_shutdown(subs->stream->chip);
939 static const struct snd_pcm_hardware snd_usb_hardware =
941 .info = SNDRV_PCM_INFO_MMAP |
942 SNDRV_PCM_INFO_MMAP_VALID |
943 SNDRV_PCM_INFO_BATCH |
944 SNDRV_PCM_INFO_INTERLEAVED |
945 SNDRV_PCM_INFO_BLOCK_TRANSFER |
946 SNDRV_PCM_INFO_PAUSE,
947 .buffer_bytes_max = 1024 * 1024,
948 .period_bytes_min = 64,
949 .period_bytes_max = 512 * 1024,
954 static int hw_check_valid_format(struct snd_usb_substream *subs,
955 struct snd_pcm_hw_params *params,
956 struct audioformat *fp)
958 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
959 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
960 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
961 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
962 struct snd_mask check_fmts;
965 /* check the format */
966 snd_mask_none(&check_fmts);
967 check_fmts.bits[0] = (u32)fp->formats;
968 check_fmts.bits[1] = (u32)(fp->formats >> 32);
969 snd_mask_intersect(&check_fmts, fmts);
970 if (snd_mask_empty(&check_fmts)) {
971 hwc_debug(" > check: no supported format %d\n", fp->format);
974 /* check the channels */
975 if (fp->channels < ct->min || fp->channels > ct->max) {
976 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
979 /* check the rate is within the range */
980 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
981 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
984 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
985 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
988 /* check whether the period time is >= the data packet interval */
989 if (subs->speed != USB_SPEED_FULL) {
990 ptime = 125 * (1 << fp->datainterval);
991 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
992 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
999 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1000 struct snd_pcm_hw_rule *rule)
1002 struct snd_usb_substream *subs = rule->private;
1003 struct audioformat *fp;
1004 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1005 unsigned int rmin, rmax;
1008 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1011 list_for_each_entry(fp, &subs->fmt_list, list) {
1012 if (!hw_check_valid_format(subs, params, fp))
1015 if (rmin > fp->rate_min)
1016 rmin = fp->rate_min;
1017 if (rmax < fp->rate_max)
1018 rmax = fp->rate_max;
1020 rmin = fp->rate_min;
1021 rmax = fp->rate_max;
1026 hwc_debug(" --> get empty\n");
1032 if (it->min < rmin) {
1037 if (it->max > rmax) {
1042 if (snd_interval_checkempty(it)) {
1046 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1051 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1052 struct snd_pcm_hw_rule *rule)
1054 struct snd_usb_substream *subs = rule->private;
1055 struct audioformat *fp;
1056 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1057 unsigned int rmin, rmax;
1060 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1063 list_for_each_entry(fp, &subs->fmt_list, list) {
1064 if (!hw_check_valid_format(subs, params, fp))
1067 if (rmin > fp->channels)
1068 rmin = fp->channels;
1069 if (rmax < fp->channels)
1070 rmax = fp->channels;
1072 rmin = fp->channels;
1073 rmax = fp->channels;
1078 hwc_debug(" --> get empty\n");
1084 if (it->min < rmin) {
1089 if (it->max > rmax) {
1094 if (snd_interval_checkempty(it)) {
1098 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1102 static int hw_rule_format(struct snd_pcm_hw_params *params,
1103 struct snd_pcm_hw_rule *rule)
1105 struct snd_usb_substream *subs = rule->private;
1106 struct audioformat *fp;
1107 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1112 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1114 list_for_each_entry(fp, &subs->fmt_list, list) {
1115 if (!hw_check_valid_format(subs, params, fp))
1117 fbits |= fp->formats;
1120 oldbits[0] = fmt->bits[0];
1121 oldbits[1] = fmt->bits[1];
1122 fmt->bits[0] &= (u32)fbits;
1123 fmt->bits[1] &= (u32)(fbits >> 32);
1124 if (!fmt->bits[0] && !fmt->bits[1]) {
1125 hwc_debug(" --> get empty\n");
1128 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1129 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1133 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1134 struct snd_pcm_hw_rule *rule)
1136 struct snd_usb_substream *subs = rule->private;
1137 struct audioformat *fp;
1138 struct snd_interval *it;
1139 unsigned char min_datainterval;
1143 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1144 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1145 min_datainterval = 0xff;
1146 list_for_each_entry(fp, &subs->fmt_list, list) {
1147 if (!hw_check_valid_format(subs, params, fp))
1149 min_datainterval = min(min_datainterval, fp->datainterval);
1151 if (min_datainterval == 0xff) {
1152 hwc_debug(" --> get empty\n");
1156 pmin = 125 * (1 << min_datainterval);
1158 if (it->min < pmin) {
1163 if (snd_interval_checkempty(it)) {
1167 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1172 * If the device supports unusual bit rates, does the request meet these?
1174 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1175 struct snd_usb_substream *subs)
1177 struct audioformat *fp;
1179 int count = 0, needs_knot = 0;
1182 kfree(subs->rate_list.list);
1183 subs->rate_list.list = NULL;
1185 list_for_each_entry(fp, &subs->fmt_list, list) {
1186 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1188 count += fp->nr_rates;
1189 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1195 subs->rate_list.list = rate_list =
1196 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1197 if (!subs->rate_list.list)
1199 subs->rate_list.count = count;
1200 subs->rate_list.mask = 0;
1202 list_for_each_entry(fp, &subs->fmt_list, list) {
1204 for (i = 0; i < fp->nr_rates; i++)
1205 rate_list[count++] = fp->rate_table[i];
1207 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1217 * set up the runtime hardware information.
1220 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1222 struct audioformat *fp;
1223 unsigned int pt, ptmin;
1224 int param_period_time_if_needed;
1227 runtime->hw.formats = subs->formats;
1229 runtime->hw.rate_min = 0x7fffffff;
1230 runtime->hw.rate_max = 0;
1231 runtime->hw.channels_min = 256;
1232 runtime->hw.channels_max = 0;
1233 runtime->hw.rates = 0;
1235 /* check min/max rates and channels */
1236 list_for_each_entry(fp, &subs->fmt_list, list) {
1237 runtime->hw.rates |= fp->rates;
1238 if (runtime->hw.rate_min > fp->rate_min)
1239 runtime->hw.rate_min = fp->rate_min;
1240 if (runtime->hw.rate_max < fp->rate_max)
1241 runtime->hw.rate_max = fp->rate_max;
1242 if (runtime->hw.channels_min > fp->channels)
1243 runtime->hw.channels_min = fp->channels;
1244 if (runtime->hw.channels_max < fp->channels)
1245 runtime->hw.channels_max = fp->channels;
1246 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1247 /* FIXME: there might be more than one audio formats... */
1248 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1251 pt = 125 * (1 << fp->datainterval);
1252 ptmin = min(ptmin, pt);
1255 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1256 if (subs->speed == USB_SPEED_FULL)
1257 /* full speed devices have fixed data packet interval */
1260 /* if period time doesn't go below 1 ms, no rules needed */
1261 param_period_time_if_needed = -1;
1263 err = snd_pcm_hw_constraint_minmax(runtime,
1264 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1271 SNDRV_PCM_HW_PARAM_FORMAT,
1272 SNDRV_PCM_HW_PARAM_CHANNELS,
1273 param_period_time_if_needed,
1277 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1278 hw_rule_channels, subs,
1279 SNDRV_PCM_HW_PARAM_FORMAT,
1280 SNDRV_PCM_HW_PARAM_RATE,
1281 param_period_time_if_needed,
1285 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1286 hw_rule_format, subs,
1287 SNDRV_PCM_HW_PARAM_RATE,
1288 SNDRV_PCM_HW_PARAM_CHANNELS,
1289 param_period_time_if_needed,
1293 if (param_period_time_if_needed >= 0) {
1294 err = snd_pcm_hw_rule_add(runtime, 0,
1295 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1296 hw_rule_period_time, subs,
1297 SNDRV_PCM_HW_PARAM_FORMAT,
1298 SNDRV_PCM_HW_PARAM_CHANNELS,
1299 SNDRV_PCM_HW_PARAM_RATE,
1304 err = snd_usb_pcm_check_knot(runtime, subs);
1308 return snd_usb_autoresume(subs->stream->chip);
1311 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1313 int direction = substream->stream;
1314 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1315 struct snd_pcm_runtime *runtime = substream->runtime;
1316 struct snd_usb_substream *subs = &as->substream[direction];
1319 subs->interface = -1;
1320 subs->altset_idx = 0;
1321 runtime->hw = snd_usb_hardware;
1322 runtime->private_data = subs;
1323 subs->pcm_substream = substream;
1324 /* runtime PM is also done there */
1326 /* initialize DSD/DOP context */
1327 subs->dsd_dop.byte_idx = 0;
1328 subs->dsd_dop.channel = 0;
1329 subs->dsd_dop.marker = 1;
1331 ret = setup_hw_info(runtime, subs);
1333 ret = snd_media_stream_init(subs, as->pcm, direction);
1335 snd_usb_autosuspend(subs->stream->chip);
1340 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1342 int direction = substream->stream;
1343 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1344 struct snd_usb_substream *subs = &as->substream[direction];
1347 stop_endpoints(subs, true);
1348 snd_media_stop_pipeline(subs);
1350 if (!as->chip->keep_iface &&
1351 subs->interface >= 0 &&
1352 !snd_usb_lock_shutdown(subs->stream->chip)) {
1353 usb_set_interface(subs->dev, subs->interface, 0);
1354 subs->interface = -1;
1355 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1356 snd_usb_unlock_shutdown(subs->stream->chip);
1361 subs->pcm_substream = NULL;
1362 snd_usb_autosuspend(subs->stream->chip);
1367 /* Since a URB can handle only a single linear buffer, we must use double
1368 * buffering when the data to be transferred overflows the buffer boundary.
1369 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1372 static void retire_capture_urb(struct snd_usb_substream *subs,
1375 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1376 unsigned int stride, frames, bytes, oldptr;
1377 int i, period_elapsed = 0;
1378 unsigned long flags;
1380 int current_frame_number;
1382 /* read frame number here, update pointer in critical section */
1383 current_frame_number = usb_get_current_frame_number(subs->dev);
1385 stride = runtime->frame_bits >> 3;
1387 for (i = 0; i < urb->number_of_packets; i++) {
1388 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1389 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1390 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1391 i, urb->iso_frame_desc[i].status);
1394 bytes = urb->iso_frame_desc[i].actual_length;
1395 frames = bytes / stride;
1396 if (!subs->txfr_quirk)
1397 bytes = frames * stride;
1398 if (bytes % (runtime->sample_bits >> 3) != 0) {
1399 int oldbytes = bytes;
1400 bytes = frames * stride;
1401 dev_warn_ratelimited(&subs->dev->dev,
1402 "Corrected urb data len. %d->%d\n",
1405 /* update the current pointer */
1406 spin_lock_irqsave(&subs->lock, flags);
1407 oldptr = subs->hwptr_done;
1408 subs->hwptr_done += bytes;
1409 if (subs->hwptr_done >= runtime->buffer_size * stride)
1410 subs->hwptr_done -= runtime->buffer_size * stride;
1411 frames = (bytes + (oldptr % stride)) / stride;
1412 subs->transfer_done += frames;
1413 if (subs->transfer_done >= runtime->period_size) {
1414 subs->transfer_done -= runtime->period_size;
1417 /* capture delay is by construction limited to one URB,
1420 runtime->delay = subs->last_delay = 0;
1422 /* realign last_frame_number */
1423 subs->last_frame_number = current_frame_number;
1424 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1426 spin_unlock_irqrestore(&subs->lock, flags);
1427 /* copy a data chunk */
1428 if (oldptr + bytes > runtime->buffer_size * stride) {
1429 unsigned int bytes1 =
1430 runtime->buffer_size * stride - oldptr;
1431 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1432 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1434 memcpy(runtime->dma_area + oldptr, cp, bytes);
1439 snd_pcm_period_elapsed(subs->pcm_substream);
1442 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1443 struct urb *urb, unsigned int bytes)
1445 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1446 unsigned int stride = runtime->frame_bits >> 3;
1447 unsigned int dst_idx = 0;
1448 unsigned int src_idx = subs->hwptr_done;
1449 unsigned int wrap = runtime->buffer_size * stride;
1450 u8 *dst = urb->transfer_buffer;
1451 u8 *src = runtime->dma_area;
1452 u8 marker[] = { 0x05, 0xfa };
1455 * The DSP DOP format defines a way to transport DSD samples over
1456 * normal PCM data endpoints. It requires stuffing of marker bytes
1457 * (0x05 and 0xfa, alternating per sample frame), and then expects
1458 * 2 additional bytes of actual payload. The whole frame is stored
1461 * Hence, for a stereo transport, the buffer layout looks like this,
1462 * where L refers to left channel samples and R to right.
1464 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1465 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1471 if (++subs->dsd_dop.byte_idx == 3) {
1472 /* frame boundary? */
1473 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1475 subs->dsd_dop.byte_idx = 0;
1477 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1478 /* alternate the marker */
1479 subs->dsd_dop.marker++;
1480 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1481 subs->dsd_dop.channel = 0;
1484 /* stuff the DSD payload */
1485 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1487 if (subs->cur_audiofmt->dsd_bitrev)
1488 dst[dst_idx++] = bitrev8(src[idx]);
1490 dst[dst_idx++] = src[idx];
1495 if (subs->hwptr_done >= runtime->buffer_size * stride)
1496 subs->hwptr_done -= runtime->buffer_size * stride;
1499 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1500 int offset, int stride, unsigned int bytes)
1502 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1504 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1505 /* err, the transferred area goes over buffer boundary. */
1506 unsigned int bytes1 =
1507 runtime->buffer_size * stride - subs->hwptr_done;
1508 memcpy(urb->transfer_buffer + offset,
1509 runtime->dma_area + subs->hwptr_done, bytes1);
1510 memcpy(urb->transfer_buffer + offset + bytes1,
1511 runtime->dma_area, bytes - bytes1);
1513 memcpy(urb->transfer_buffer + offset,
1514 runtime->dma_area + subs->hwptr_done, bytes);
1516 subs->hwptr_done += bytes;
1517 if (subs->hwptr_done >= runtime->buffer_size * stride)
1518 subs->hwptr_done -= runtime->buffer_size * stride;
1521 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1522 struct urb *urb, int stride,
1525 __le32 packet_length;
1528 /* Put __le32 length descriptor at start of each packet. */
1529 for (i = 0; i < urb->number_of_packets; i++) {
1530 unsigned int length = urb->iso_frame_desc[i].length;
1531 unsigned int offset = urb->iso_frame_desc[i].offset;
1533 packet_length = cpu_to_le32(length);
1534 offset += i * sizeof(packet_length);
1535 urb->iso_frame_desc[i].offset = offset;
1536 urb->iso_frame_desc[i].length += sizeof(packet_length);
1537 memcpy(urb->transfer_buffer + offset,
1538 &packet_length, sizeof(packet_length));
1539 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1542 /* Adjust transfer size accordingly. */
1543 bytes += urb->number_of_packets * sizeof(packet_length);
1547 static void prepare_playback_urb(struct snd_usb_substream *subs,
1550 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1551 struct snd_usb_endpoint *ep = subs->data_endpoint;
1552 struct snd_urb_ctx *ctx = urb->context;
1553 unsigned int counts, frames, bytes;
1554 int i, stride, period_elapsed = 0;
1555 unsigned long flags;
1557 stride = runtime->frame_bits >> 3;
1560 urb->number_of_packets = 0;
1561 spin_lock_irqsave(&subs->lock, flags);
1562 subs->frame_limit += ep->max_urb_frames;
1563 for (i = 0; i < ctx->packets; i++) {
1564 if (ctx->packet_size[i])
1565 counts = ctx->packet_size[i];
1567 counts = snd_usb_endpoint_next_packet_size(ep);
1569 /* set up descriptor */
1570 urb->iso_frame_desc[i].offset = frames * ep->stride;
1571 urb->iso_frame_desc[i].length = counts * ep->stride;
1573 urb->number_of_packets++;
1574 subs->transfer_done += counts;
1575 if (subs->transfer_done >= runtime->period_size) {
1576 subs->transfer_done -= runtime->period_size;
1577 subs->frame_limit = 0;
1579 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1580 if (subs->transfer_done > 0) {
1581 /* FIXME: fill-max mode is not
1583 frames -= subs->transfer_done;
1584 counts -= subs->transfer_done;
1585 urb->iso_frame_desc[i].length =
1586 counts * ep->stride;
1587 subs->transfer_done = 0;
1590 if (i < ctx->packets) {
1591 /* add a transfer delimiter */
1592 urb->iso_frame_desc[i].offset =
1593 frames * ep->stride;
1594 urb->iso_frame_desc[i].length = 0;
1595 urb->number_of_packets++;
1600 /* finish at the period boundary or after enough frames */
1601 if ((period_elapsed ||
1602 subs->transfer_done >= subs->frame_limit) &&
1603 !snd_usb_endpoint_implicit_feedback_sink(ep))
1606 bytes = frames * ep->stride;
1608 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1609 subs->cur_audiofmt->dsd_dop)) {
1610 fill_playback_urb_dsd_dop(subs, urb, bytes);
1611 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1612 subs->cur_audiofmt->dsd_bitrev)) {
1613 /* bit-reverse the bytes */
1614 u8 *buf = urb->transfer_buffer;
1615 for (i = 0; i < bytes; i++) {
1616 int idx = (subs->hwptr_done + i)
1617 % (runtime->buffer_size * stride);
1618 buf[i] = bitrev8(runtime->dma_area[idx]);
1621 subs->hwptr_done += bytes;
1622 if (subs->hwptr_done >= runtime->buffer_size * stride)
1623 subs->hwptr_done -= runtime->buffer_size * stride;
1626 if (!subs->tx_length_quirk)
1627 copy_to_urb(subs, urb, 0, stride, bytes);
1629 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1630 /* bytes is now amount of outgoing data */
1633 /* update delay with exact number of samples queued */
1634 runtime->delay = subs->last_delay;
1635 runtime->delay += frames;
1636 subs->last_delay = runtime->delay;
1638 /* realign last_frame_number */
1639 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1640 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1642 if (subs->trigger_tstamp_pending_update) {
1643 /* this is the first actual URB submitted,
1644 * update trigger timestamp to reflect actual start time
1646 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1647 subs->trigger_tstamp_pending_update = false;
1650 spin_unlock_irqrestore(&subs->lock, flags);
1651 urb->transfer_buffer_length = bytes;
1653 snd_pcm_period_elapsed(subs->pcm_substream);
1657 * process after playback data complete
1658 * - decrease the delay count again
1660 static void retire_playback_urb(struct snd_usb_substream *subs,
1663 unsigned long flags;
1664 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1665 struct snd_usb_endpoint *ep = subs->data_endpoint;
1666 int processed = urb->transfer_buffer_length / ep->stride;
1669 /* ignore the delay accounting when procssed=0 is given, i.e.
1670 * silent payloads are procssed before handling the actual data
1675 spin_lock_irqsave(&subs->lock, flags);
1676 if (!subs->last_delay)
1677 goto out; /* short path */
1679 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1680 /* update delay with exact number of samples played */
1681 if (processed > subs->last_delay)
1682 subs->last_delay = 0;
1684 subs->last_delay -= processed;
1685 runtime->delay = subs->last_delay;
1688 * Report when delay estimate is off by more than 2ms.
1689 * The error should be lower than 2ms since the estimate relies
1690 * on two reads of a counter updated every ms.
1692 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1693 dev_dbg_ratelimited(&subs->dev->dev,
1694 "delay: estimated %d, actual %d\n",
1695 est_delay, subs->last_delay);
1697 if (!subs->running) {
1698 /* update last_frame_number for delay counting here since
1699 * prepare_playback_urb won't be called during pause
1701 subs->last_frame_number =
1702 usb_get_current_frame_number(subs->dev) & 0xff;
1706 spin_unlock_irqrestore(&subs->lock, flags);
1709 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1712 struct snd_usb_substream *subs = substream->runtime->private_data;
1715 case SNDRV_PCM_TRIGGER_START:
1716 subs->trigger_tstamp_pending_update = true;
1718 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1719 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1720 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1723 case SNDRV_PCM_TRIGGER_STOP:
1724 stop_endpoints(subs, false);
1727 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1728 subs->data_endpoint->prepare_data_urb = NULL;
1729 /* keep retire_data_urb for delay calculation */
1730 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1738 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1742 struct snd_usb_substream *subs = substream->runtime->private_data;
1745 case SNDRV_PCM_TRIGGER_START:
1746 err = start_endpoints(subs);
1750 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1753 case SNDRV_PCM_TRIGGER_STOP:
1754 stop_endpoints(subs, false);
1757 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1758 subs->data_endpoint->retire_data_urb = NULL;
1761 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1762 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1770 static const struct snd_pcm_ops snd_usb_playback_ops = {
1771 .open = snd_usb_pcm_open,
1772 .close = snd_usb_pcm_close,
1773 .ioctl = snd_pcm_lib_ioctl,
1774 .hw_params = snd_usb_hw_params,
1775 .hw_free = snd_usb_hw_free,
1776 .prepare = snd_usb_pcm_prepare,
1777 .trigger = snd_usb_substream_playback_trigger,
1778 .pointer = snd_usb_pcm_pointer,
1779 .page = snd_pcm_lib_get_vmalloc_page,
1782 static const struct snd_pcm_ops snd_usb_capture_ops = {
1783 .open = snd_usb_pcm_open,
1784 .close = snd_usb_pcm_close,
1785 .ioctl = snd_pcm_lib_ioctl,
1786 .hw_params = snd_usb_hw_params,
1787 .hw_free = snd_usb_hw_free,
1788 .prepare = snd_usb_pcm_prepare,
1789 .trigger = snd_usb_substream_capture_trigger,
1790 .pointer = snd_usb_pcm_pointer,
1791 .page = snd_pcm_lib_get_vmalloc_page,
1794 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1795 .open = snd_usb_pcm_open,
1796 .close = snd_usb_pcm_close,
1797 .ioctl = snd_pcm_lib_ioctl,
1798 .hw_params = snd_usb_hw_params,
1799 .hw_free = snd_usb_hw_free,
1800 .prepare = snd_usb_pcm_prepare,
1801 .trigger = snd_usb_substream_playback_trigger,
1802 .pointer = snd_usb_pcm_pointer,
1803 .page = snd_pcm_sgbuf_ops_page,
1806 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1807 .open = snd_usb_pcm_open,
1808 .close = snd_usb_pcm_close,
1809 .ioctl = snd_pcm_lib_ioctl,
1810 .hw_params = snd_usb_hw_params,
1811 .hw_free = snd_usb_hw_free,
1812 .prepare = snd_usb_pcm_prepare,
1813 .trigger = snd_usb_substream_capture_trigger,
1814 .pointer = snd_usb_pcm_pointer,
1815 .page = snd_pcm_sgbuf_ops_page,
1818 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1820 const struct snd_pcm_ops *ops;
1822 if (snd_usb_use_vmalloc)
1823 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1824 &snd_usb_playback_ops : &snd_usb_capture_ops;
1826 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1827 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1828 snd_pcm_set_ops(pcm, stream, ops);
1831 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1833 struct snd_pcm *pcm = subs->stream->pcm;
1834 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1835 struct device *dev = subs->dev->bus->controller;
1837 if (!snd_usb_use_vmalloc)
1838 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1839 dev, 64*1024, 512*1024);