1 // SPDX-License-Identifier: GPL-2.0-or-later
5 #include <linux/init.h>
6 #include <linux/slab.h>
7 #include <linux/bitrev.h>
8 #include <linux/ratelimit.h>
10 #include <linux/usb/audio.h>
11 #include <linux/usb/audio-v2.h>
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
31 /* return the estimated delay based on USB frame counters */
32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
35 int current_frame_number;
39 if (!subs->last_delay)
40 return 0; /* short path */
42 current_frame_number = usb_get_current_frame_number(subs->dev);
44 * HCD implementations use different widths, use lower 8 bits.
45 * The delay will be managed up to 256ms, which is more than
48 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
50 /* Approximation based on number of samples per USB frame (ms),
51 some truncation for 44.1 but the estimate is good enough */
52 est_delay = frame_diff * rate / 1000;
53 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
54 est_delay = subs->last_delay - est_delay;
56 est_delay = subs->last_delay + est_delay;
64 * return the current pcm pointer. just based on the hwptr_done value.
66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
68 struct snd_usb_substream *subs = substream->runtime->private_data;
69 unsigned int hwptr_done;
71 if (atomic_read(&subs->stream->chip->shutdown))
72 return SNDRV_PCM_POS_XRUN;
73 spin_lock(&subs->lock);
74 hwptr_done = subs->hwptr_done;
75 substream->runtime->delay = snd_usb_pcm_delay(subs,
76 substream->runtime->rate);
77 spin_unlock(&subs->lock);
78 return hwptr_done / (substream->runtime->frame_bits >> 3);
82 * find a matching audio format
84 static struct audioformat *find_format(struct snd_usb_substream *subs)
86 struct audioformat *fp;
87 struct audioformat *found = NULL;
88 int cur_attr = 0, attr;
90 list_for_each_entry(fp, &subs->fmt_list, list) {
91 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
93 if (fp->channels != subs->channels)
95 if (subs->cur_rate < fp->rate_min ||
96 subs->cur_rate > fp->rate_max)
98 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
100 for (i = 0; i < fp->nr_rates; i++)
101 if (fp->rate_table[i] == subs->cur_rate)
103 if (i >= fp->nr_rates)
106 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
112 /* avoid async out and adaptive in if the other method
113 * supports the same format.
114 * this is a workaround for the case like
115 * M-audio audiophile USB.
117 if (attr != cur_attr) {
118 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
119 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
120 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
121 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
123 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
124 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
125 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
126 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
132 /* find the format with the largest max. packet size */
133 if (fp->maxpacksize > found->maxpacksize) {
141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
142 struct usb_host_interface *alts,
143 struct audioformat *fmt)
145 struct usb_device *dev = chip->dev;
147 unsigned char data[1];
150 if (get_iface_desc(alts)->bNumEndpoints < 1)
152 ep = get_endpoint(alts, 0)->bEndpointAddress;
155 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
156 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
157 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
160 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
169 struct usb_host_interface *alts,
170 struct audioformat *fmt)
172 struct usb_device *dev = chip->dev;
173 unsigned char data[1];
177 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
178 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
179 UAC2_EP_CS_PITCH << 8, 0,
182 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
183 iface, fmt->altsetting);
191 * initialize the pitch control and sample rate
193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
194 struct usb_host_interface *alts,
195 struct audioformat *fmt)
197 /* if endpoint doesn't have pitch control, bail out */
198 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
201 switch (fmt->protocol) {
204 return init_pitch_v1(chip, iface, alts, fmt);
207 return init_pitch_v2(chip, iface, alts, fmt);
211 static int start_endpoints(struct snd_usb_substream *subs)
215 if (!subs->data_endpoint)
218 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
219 struct snd_usb_endpoint *ep = subs->data_endpoint;
221 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
223 ep->data_subs = subs;
224 err = snd_usb_endpoint_start(ep);
226 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
231 if (subs->sync_endpoint &&
232 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
233 struct snd_usb_endpoint *ep = subs->sync_endpoint;
235 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
236 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
237 err = usb_set_interface(subs->dev,
238 subs->sync_endpoint->iface,
239 subs->sync_endpoint->altsetting);
241 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
242 dev_err(&subs->dev->dev,
243 "%d:%d: cannot set interface (%d)\n",
244 subs->sync_endpoint->iface,
245 subs->sync_endpoint->altsetting, err);
250 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
252 ep->sync_slave = subs->data_endpoint;
253 err = snd_usb_endpoint_start(ep);
255 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
263 static void sync_pending_stops(struct snd_usb_substream *subs)
265 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
266 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
269 static void stop_endpoints(struct snd_usb_substream *subs)
271 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
272 snd_usb_endpoint_stop(subs->sync_endpoint);
274 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
275 snd_usb_endpoint_stop(subs->data_endpoint);
278 /* PCM sync_stop callback */
279 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
281 struct snd_usb_substream *subs = substream->runtime->private_data;
283 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
284 sync_pending_stops(subs);
285 snd_usb_unlock_shutdown(subs->stream->chip);
290 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
291 unsigned int altsetting,
292 struct usb_host_interface **alts,
295 struct usb_interface *iface;
296 struct usb_interface_descriptor *altsd;
297 struct usb_endpoint_descriptor *epd;
299 iface = usb_ifnum_to_if(dev, ifnum);
300 if (!iface || iface->num_altsetting < altsetting + 1)
302 *alts = &iface->altsetting[altsetting];
303 altsd = get_iface_desc(*alts);
304 if (altsd->bAlternateSetting != altsetting ||
305 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
306 (altsd->bInterfaceSubClass != 2 &&
307 altsd->bInterfaceProtocol != 2 ) ||
308 altsd->bNumEndpoints < 1)
310 epd = get_endpoint(*alts, 0);
311 if (!usb_endpoint_is_isoc_in(epd) ||
312 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
313 USB_ENDPOINT_USAGE_IMPLICIT_FB)
315 *ep = epd->bEndpointAddress;
319 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
320 * applies. Returns 1 if a quirk was found.
322 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
323 struct usb_device *dev,
324 struct usb_interface_descriptor *altsd,
327 struct usb_host_interface *alts;
328 struct usb_interface *iface;
332 /* Implicit feedback sync EPs consumers are always playback EPs */
333 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
336 switch (subs->stream->chip->usb_id) {
337 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
338 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
341 goto add_sync_ep_from_ifnum;
342 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
343 case USB_ID(0x0763, 0x2081):
346 goto add_sync_ep_from_ifnum;
347 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
350 goto add_sync_ep_from_ifnum;
351 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
354 goto add_sync_ep_from_ifnum;
355 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
356 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
359 goto add_sync_ep_from_ifnum;
360 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
363 goto add_sync_ep_from_ifnum;
364 case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
367 goto add_sync_ep_from_ifnum;
368 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
369 /* BOSS Katana amplifiers do not need quirks */
373 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
374 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
375 altsd->bInterfaceProtocol == 2 &&
376 altsd->bNumEndpoints == 1 &&
377 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
378 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
379 altsd->bAlternateSetting,
387 add_sync_ep_from_ifnum:
388 iface = usb_ifnum_to_if(dev, ifnum);
390 if (!iface || iface->num_altsetting < 2)
393 alts = &iface->altsetting[1];
396 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
397 alts, ep, !subs->direction,
398 SND_USB_ENDPOINT_TYPE_DATA);
399 if (!subs->sync_endpoint)
402 subs->data_endpoint->sync_master = subs->sync_endpoint;
407 static int set_sync_endpoint(struct snd_usb_substream *subs,
408 struct audioformat *fmt,
409 struct usb_device *dev,
410 struct usb_host_interface *alts,
411 struct usb_interface_descriptor *altsd)
413 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
414 unsigned int ep, attr;
418 /* we need a sync pipe in async OUT or adaptive IN mode */
419 /* check the number of EP, since some devices have broken
420 * descriptors which fool us. if it has only one EP,
421 * assume it as adaptive-out or sync-in.
423 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
425 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
426 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
429 * In these modes the notion of sync_endpoint is irrelevant.
430 * Reset pointers to avoid using stale data from previously
431 * used settings, e.g. when configuration and endpoints were
435 subs->sync_endpoint = NULL;
436 subs->data_endpoint->sync_master = NULL;
439 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
443 /* endpoint set by quirk */
447 if (altsd->bNumEndpoints < 2)
450 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
451 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
452 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
456 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
457 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
458 * error fall back to SYNC mode and don't create sync endpoint
461 /* check sync-pipe endpoint */
462 /* ... and check descriptor size before accessing bSynchAddress
463 because there is a version of the SB Audigy 2 NX firmware lacking
464 the audio fields in the endpoint descriptors */
465 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
466 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
467 get_endpoint(alts, 1)->bSynchAddress != 0)) {
469 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
470 fmt->iface, fmt->altsetting,
471 get_endpoint(alts, 1)->bmAttributes,
472 get_endpoint(alts, 1)->bLength,
473 get_endpoint(alts, 1)->bSynchAddress);
474 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
478 ep = get_endpoint(alts, 1)->bEndpointAddress;
479 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
480 get_endpoint(alts, 0)->bSynchAddress != 0 &&
481 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
482 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
484 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
485 fmt->iface, fmt->altsetting,
486 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
487 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
492 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
493 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
495 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
496 alts, ep, !subs->direction,
498 SND_USB_ENDPOINT_TYPE_DATA :
499 SND_USB_ENDPOINT_TYPE_SYNC);
500 if (!subs->sync_endpoint) {
501 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
506 subs->data_endpoint->sync_master = subs->sync_endpoint;
512 * find a matching format and set up the interface
514 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
516 struct usb_device *dev = subs->dev;
517 struct usb_host_interface *alts;
518 struct usb_interface_descriptor *altsd;
519 struct usb_interface *iface;
522 iface = usb_ifnum_to_if(dev, fmt->iface);
525 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
528 altsd = get_iface_desc(alts);
530 if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
533 /* close the old interface */
534 if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
535 if (!subs->stream->chip->keep_iface) {
536 err = usb_set_interface(subs->dev, subs->interface, 0);
539 "%d:%d: return to setting 0 failed (%d)\n",
540 fmt->iface, fmt->altsetting, err);
544 subs->interface = -1;
545 subs->altset_idx = 0;
548 if (subs->need_setup_fmt)
549 subs->need_setup_fmt = false;
552 if (iface->cur_altsetting != alts) {
553 err = snd_usb_select_mode_quirk(subs, fmt);
557 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
560 "%d:%d: usb_set_interface failed (%d)\n",
561 fmt->iface, fmt->altsetting, err);
564 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
565 fmt->iface, fmt->altsetting);
566 snd_usb_set_interface_quirk(dev);
569 subs->interface = fmt->iface;
570 subs->altset_idx = fmt->altset_idx;
571 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
572 alts, fmt->endpoint, subs->direction,
573 SND_USB_ENDPOINT_TYPE_DATA);
575 if (!subs->data_endpoint)
578 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
582 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
586 subs->cur_audiofmt = fmt;
588 snd_usb_set_format_quirk(subs, fmt);
594 * Return the score of matching two audioformats.
595 * Veto the audioformat if:
596 * - It has no channels for some reason.
597 * - Requested PCM format is not supported.
598 * - Requested sample rate is not supported.
600 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
601 struct audioformat *fp,
602 struct audioformat *match, int rate,
603 snd_pcm_format_t pcm_format)
608 if (fp->channels < 1) {
609 dev_dbg(&subs->dev->dev,
610 "%s: (fmt @%p) no channels\n", __func__, fp);
614 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
615 dev_dbg(&subs->dev->dev,
616 "%s: (fmt @%p) no match for format %d\n", __func__,
621 for (i = 0; i < fp->nr_rates; i++) {
622 if (fp->rate_table[i] == rate) {
628 dev_dbg(&subs->dev->dev,
629 "%s: (fmt @%p) no match for rate %d\n", __func__,
634 if (fp->channels == match->channels)
637 dev_dbg(&subs->dev->dev,
638 "%s: (fmt @%p) score %d\n", __func__, fp, score);
644 * Configure the sync ep using the rate and pcm format of the data ep.
646 static int configure_sync_endpoint(struct snd_usb_substream *subs)
649 struct audioformat *fp;
650 struct audioformat *sync_fp = NULL;
652 int sync_period_bytes = subs->period_bytes;
653 struct snd_usb_substream *sync_subs =
654 &subs->stream->substream[subs->direction ^ 1];
656 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
658 return snd_usb_endpoint_set_params(subs->sync_endpoint,
667 /* Try to find the best matching audioformat. */
668 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
669 int score = match_endpoint_audioformats(subs,
670 fp, subs->cur_audiofmt,
671 subs->cur_rate, subs->pcm_format);
673 if (score > cur_score) {
679 if (unlikely(sync_fp == NULL)) {
680 dev_err(&subs->dev->dev,
681 "%s: no valid audioformat for sync ep %x found\n",
682 __func__, sync_subs->ep_num);
687 * Recalculate the period bytes if channel number differ between
688 * data and sync ep audioformat.
690 if (sync_fp->channels != subs->channels) {
691 sync_period_bytes = (subs->period_bytes / subs->channels) *
693 dev_dbg(&subs->dev->dev,
694 "%s: adjusted sync ep period bytes (%d -> %d)\n",
695 __func__, subs->period_bytes, sync_period_bytes);
698 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
711 * configure endpoint params
713 * called during initial setup and upon resume
715 static int configure_endpoint(struct snd_usb_substream *subs)
720 stop_endpoints(subs);
721 sync_pending_stops(subs);
722 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
727 subs->buffer_periods,
730 subs->sync_endpoint);
734 if (subs->sync_endpoint)
735 ret = configure_sync_endpoint(subs);
740 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
747 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
749 dev_err(&subs->dev->dev,
750 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
751 subs->str_pd->pd_id, state, ret);
758 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
762 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
766 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
773 int snd_usb_pcm_resume(struct snd_usb_stream *as)
777 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
781 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
791 * allocate a buffer and set the given audio format.
793 * so far we use a physically linear buffer although packetize transfer
794 * doesn't need a continuous area.
795 * if sg buffer is supported on the later version of alsa, we'll follow
798 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
799 struct snd_pcm_hw_params *hw_params)
801 struct snd_usb_substream *subs = substream->runtime->private_data;
802 struct audioformat *fmt;
805 ret = snd_media_start_pipeline(subs);
809 subs->pcm_format = params_format(hw_params);
810 subs->period_bytes = params_period_bytes(hw_params);
811 subs->period_frames = params_period_size(hw_params);
812 subs->buffer_periods = params_periods(hw_params);
813 subs->channels = params_channels(hw_params);
814 subs->cur_rate = params_rate(hw_params);
816 fmt = find_format(subs);
818 dev_dbg(&subs->dev->dev,
819 "cannot set format: format = %#x, rate = %d, channels = %d\n",
820 subs->pcm_format, subs->cur_rate, subs->channels);
825 ret = snd_usb_lock_shutdown(subs->stream->chip);
829 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
833 ret = set_format(subs, fmt);
837 subs->interface = fmt->iface;
838 subs->altset_idx = fmt->altset_idx;
839 subs->need_setup_ep = true;
842 snd_usb_unlock_shutdown(subs->stream->chip);
848 snd_media_stop_pipeline(subs);
855 * reset the audio format and release the buffer
857 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
859 struct snd_usb_substream *subs = substream->runtime->private_data;
861 snd_media_stop_pipeline(subs);
862 subs->cur_audiofmt = NULL;
864 subs->period_bytes = 0;
865 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
866 stop_endpoints(subs);
867 sync_pending_stops(subs);
868 snd_usb_endpoint_deactivate(subs->sync_endpoint);
869 snd_usb_endpoint_deactivate(subs->data_endpoint);
870 snd_usb_unlock_shutdown(subs->stream->chip);
879 * only a few subtle things...
881 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
883 struct snd_pcm_runtime *runtime = substream->runtime;
884 struct snd_usb_substream *subs = runtime->private_data;
885 struct usb_host_interface *alts;
886 struct usb_interface *iface;
889 if (! subs->cur_audiofmt) {
890 dev_err(&subs->dev->dev, "no format is specified!\n");
894 ret = snd_usb_lock_shutdown(subs->stream->chip);
897 if (snd_BUG_ON(!subs->data_endpoint)) {
902 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
906 ret = set_format(subs, subs->cur_audiofmt);
910 if (subs->need_setup_ep) {
912 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
913 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
914 ret = snd_usb_init_sample_rate(subs->stream->chip,
915 subs->cur_audiofmt->iface,
922 ret = configure_endpoint(subs);
925 subs->need_setup_ep = false;
928 /* some unit conversions in runtime */
929 subs->data_endpoint->maxframesize =
930 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
931 subs->data_endpoint->curframesize =
932 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
934 /* reset the pointer */
935 subs->hwptr_done = 0;
936 subs->transfer_done = 0;
937 subs->last_delay = 0;
938 subs->last_frame_number = 0;
941 /* for playback, submit the URBs now; otherwise, the first hwptr_done
942 * updates for all URBs would happen at the same time when starting */
943 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
944 ret = start_endpoints(subs);
947 snd_usb_unlock_shutdown(subs->stream->chip);
951 static const struct snd_pcm_hardware snd_usb_hardware =
953 .info = SNDRV_PCM_INFO_MMAP |
954 SNDRV_PCM_INFO_MMAP_VALID |
955 SNDRV_PCM_INFO_BATCH |
956 SNDRV_PCM_INFO_INTERLEAVED |
957 SNDRV_PCM_INFO_BLOCK_TRANSFER |
958 SNDRV_PCM_INFO_PAUSE,
959 .buffer_bytes_max = 1024 * 1024,
960 .period_bytes_min = 64,
961 .period_bytes_max = 512 * 1024,
966 static int hw_check_valid_format(struct snd_usb_substream *subs,
967 struct snd_pcm_hw_params *params,
968 struct audioformat *fp)
970 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
971 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
972 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
973 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
974 struct snd_mask check_fmts;
977 /* check the format */
978 snd_mask_none(&check_fmts);
979 check_fmts.bits[0] = (u32)fp->formats;
980 check_fmts.bits[1] = (u32)(fp->formats >> 32);
981 snd_mask_intersect(&check_fmts, fmts);
982 if (snd_mask_empty(&check_fmts)) {
983 hwc_debug(" > check: no supported format %d\n", fp->format);
986 /* check the channels */
987 if (fp->channels < ct->min || fp->channels > ct->max) {
988 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
991 /* check the rate is within the range */
992 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
993 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
996 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
997 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1000 /* check whether the period time is >= the data packet interval */
1001 if (subs->speed != USB_SPEED_FULL) {
1002 ptime = 125 * (1 << fp->datainterval);
1003 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1004 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1011 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1012 struct snd_pcm_hw_rule *rule)
1014 struct snd_usb_substream *subs = rule->private;
1015 struct audioformat *fp;
1016 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1017 unsigned int rmin, rmax;
1020 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1023 list_for_each_entry(fp, &subs->fmt_list, list) {
1024 if (!hw_check_valid_format(subs, params, fp))
1027 if (rmin > fp->rate_min)
1028 rmin = fp->rate_min;
1029 if (rmax < fp->rate_max)
1030 rmax = fp->rate_max;
1032 rmin = fp->rate_min;
1033 rmax = fp->rate_max;
1038 hwc_debug(" --> get empty\n");
1044 if (it->min < rmin) {
1049 if (it->max > rmax) {
1054 if (snd_interval_checkempty(it)) {
1058 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1063 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1064 struct snd_pcm_hw_rule *rule)
1066 struct snd_usb_substream *subs = rule->private;
1067 struct audioformat *fp;
1068 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1069 unsigned int rmin, rmax;
1072 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1075 list_for_each_entry(fp, &subs->fmt_list, list) {
1076 if (!hw_check_valid_format(subs, params, fp))
1079 if (rmin > fp->channels)
1080 rmin = fp->channels;
1081 if (rmax < fp->channels)
1082 rmax = fp->channels;
1084 rmin = fp->channels;
1085 rmax = fp->channels;
1090 hwc_debug(" --> get empty\n");
1096 if (it->min < rmin) {
1101 if (it->max > rmax) {
1106 if (snd_interval_checkempty(it)) {
1110 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1114 static int hw_rule_format(struct snd_pcm_hw_params *params,
1115 struct snd_pcm_hw_rule *rule)
1117 struct snd_usb_substream *subs = rule->private;
1118 struct audioformat *fp;
1119 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1124 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1126 list_for_each_entry(fp, &subs->fmt_list, list) {
1127 if (!hw_check_valid_format(subs, params, fp))
1129 fbits |= fp->formats;
1132 oldbits[0] = fmt->bits[0];
1133 oldbits[1] = fmt->bits[1];
1134 fmt->bits[0] &= (u32)fbits;
1135 fmt->bits[1] &= (u32)(fbits >> 32);
1136 if (!fmt->bits[0] && !fmt->bits[1]) {
1137 hwc_debug(" --> get empty\n");
1140 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1141 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1145 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1146 struct snd_pcm_hw_rule *rule)
1148 struct snd_usb_substream *subs = rule->private;
1149 struct audioformat *fp;
1150 struct snd_interval *it;
1151 unsigned char min_datainterval;
1155 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1156 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1157 min_datainterval = 0xff;
1158 list_for_each_entry(fp, &subs->fmt_list, list) {
1159 if (!hw_check_valid_format(subs, params, fp))
1161 min_datainterval = min(min_datainterval, fp->datainterval);
1163 if (min_datainterval == 0xff) {
1164 hwc_debug(" --> get empty\n");
1168 pmin = 125 * (1 << min_datainterval);
1170 if (it->min < pmin) {
1175 if (snd_interval_checkempty(it)) {
1179 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1184 * If the device supports unusual bit rates, does the request meet these?
1186 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1187 struct snd_usb_substream *subs)
1189 struct audioformat *fp;
1191 int count = 0, needs_knot = 0;
1194 kfree(subs->rate_list.list);
1195 subs->rate_list.list = NULL;
1197 list_for_each_entry(fp, &subs->fmt_list, list) {
1198 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1200 count += fp->nr_rates;
1201 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1207 subs->rate_list.list = rate_list =
1208 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1209 if (!subs->rate_list.list)
1211 subs->rate_list.count = count;
1212 subs->rate_list.mask = 0;
1214 list_for_each_entry(fp, &subs->fmt_list, list) {
1216 for (i = 0; i < fp->nr_rates; i++)
1217 rate_list[count++] = fp->rate_table[i];
1219 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1229 * set up the runtime hardware information.
1232 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1234 struct audioformat *fp;
1235 unsigned int pt, ptmin;
1236 int param_period_time_if_needed;
1239 runtime->hw.formats = subs->formats;
1241 runtime->hw.rate_min = 0x7fffffff;
1242 runtime->hw.rate_max = 0;
1243 runtime->hw.channels_min = 256;
1244 runtime->hw.channels_max = 0;
1245 runtime->hw.rates = 0;
1247 /* check min/max rates and channels */
1248 list_for_each_entry(fp, &subs->fmt_list, list) {
1249 runtime->hw.rates |= fp->rates;
1250 if (runtime->hw.rate_min > fp->rate_min)
1251 runtime->hw.rate_min = fp->rate_min;
1252 if (runtime->hw.rate_max < fp->rate_max)
1253 runtime->hw.rate_max = fp->rate_max;
1254 if (runtime->hw.channels_min > fp->channels)
1255 runtime->hw.channels_min = fp->channels;
1256 if (runtime->hw.channels_max < fp->channels)
1257 runtime->hw.channels_max = fp->channels;
1258 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1259 /* FIXME: there might be more than one audio formats... */
1260 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1263 pt = 125 * (1 << fp->datainterval);
1264 ptmin = min(ptmin, pt);
1267 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1268 if (subs->speed == USB_SPEED_FULL)
1269 /* full speed devices have fixed data packet interval */
1272 /* if period time doesn't go below 1 ms, no rules needed */
1273 param_period_time_if_needed = -1;
1275 err = snd_pcm_hw_constraint_minmax(runtime,
1276 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1281 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1283 SNDRV_PCM_HW_PARAM_FORMAT,
1284 SNDRV_PCM_HW_PARAM_CHANNELS,
1285 param_period_time_if_needed,
1289 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1290 hw_rule_channels, subs,
1291 SNDRV_PCM_HW_PARAM_FORMAT,
1292 SNDRV_PCM_HW_PARAM_RATE,
1293 param_period_time_if_needed,
1297 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1298 hw_rule_format, subs,
1299 SNDRV_PCM_HW_PARAM_RATE,
1300 SNDRV_PCM_HW_PARAM_CHANNELS,
1301 param_period_time_if_needed,
1305 if (param_period_time_if_needed >= 0) {
1306 err = snd_pcm_hw_rule_add(runtime, 0,
1307 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1308 hw_rule_period_time, subs,
1309 SNDRV_PCM_HW_PARAM_FORMAT,
1310 SNDRV_PCM_HW_PARAM_CHANNELS,
1311 SNDRV_PCM_HW_PARAM_RATE,
1316 err = snd_usb_pcm_check_knot(runtime, subs);
1320 return snd_usb_autoresume(subs->stream->chip);
1323 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1325 int direction = substream->stream;
1326 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1327 struct snd_pcm_runtime *runtime = substream->runtime;
1328 struct snd_usb_substream *subs = &as->substream[direction];
1331 subs->interface = -1;
1332 subs->altset_idx = 0;
1333 runtime->hw = snd_usb_hardware;
1334 runtime->private_data = subs;
1335 subs->pcm_substream = substream;
1336 /* runtime PM is also done there */
1338 /* initialize DSD/DOP context */
1339 subs->dsd_dop.byte_idx = 0;
1340 subs->dsd_dop.channel = 0;
1341 subs->dsd_dop.marker = 1;
1343 ret = setup_hw_info(runtime, subs);
1345 ret = snd_media_stream_init(subs, as->pcm, direction);
1347 snd_usb_autosuspend(subs->stream->chip);
1352 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1354 int direction = substream->stream;
1355 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1356 struct snd_usb_substream *subs = &as->substream[direction];
1359 snd_media_stop_pipeline(subs);
1361 if (!as->chip->keep_iface &&
1362 subs->interface >= 0 &&
1363 !snd_usb_lock_shutdown(subs->stream->chip)) {
1364 usb_set_interface(subs->dev, subs->interface, 0);
1365 subs->interface = -1;
1366 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1367 snd_usb_unlock_shutdown(subs->stream->chip);
1372 subs->pcm_substream = NULL;
1373 snd_usb_autosuspend(subs->stream->chip);
1378 /* Since a URB can handle only a single linear buffer, we must use double
1379 * buffering when the data to be transferred overflows the buffer boundary.
1380 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1383 static void retire_capture_urb(struct snd_usb_substream *subs,
1386 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1387 unsigned int stride, frames, bytes, oldptr;
1388 int i, period_elapsed = 0;
1389 unsigned long flags;
1391 int current_frame_number;
1393 /* read frame number here, update pointer in critical section */
1394 current_frame_number = usb_get_current_frame_number(subs->dev);
1396 stride = runtime->frame_bits >> 3;
1398 for (i = 0; i < urb->number_of_packets; i++) {
1399 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1400 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1401 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1402 i, urb->iso_frame_desc[i].status);
1405 bytes = urb->iso_frame_desc[i].actual_length;
1406 frames = bytes / stride;
1407 if (!subs->txfr_quirk)
1408 bytes = frames * stride;
1409 if (bytes % (runtime->sample_bits >> 3) != 0) {
1410 int oldbytes = bytes;
1411 bytes = frames * stride;
1412 dev_warn_ratelimited(&subs->dev->dev,
1413 "Corrected urb data len. %d->%d\n",
1416 /* update the current pointer */
1417 spin_lock_irqsave(&subs->lock, flags);
1418 oldptr = subs->hwptr_done;
1419 subs->hwptr_done += bytes;
1420 if (subs->hwptr_done >= runtime->buffer_size * stride)
1421 subs->hwptr_done -= runtime->buffer_size * stride;
1422 frames = (bytes + (oldptr % stride)) / stride;
1423 subs->transfer_done += frames;
1424 if (subs->transfer_done >= runtime->period_size) {
1425 subs->transfer_done -= runtime->period_size;
1428 /* capture delay is by construction limited to one URB,
1431 runtime->delay = subs->last_delay = 0;
1433 /* realign last_frame_number */
1434 subs->last_frame_number = current_frame_number;
1435 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1437 spin_unlock_irqrestore(&subs->lock, flags);
1438 /* copy a data chunk */
1439 if (oldptr + bytes > runtime->buffer_size * stride) {
1440 unsigned int bytes1 =
1441 runtime->buffer_size * stride - oldptr;
1442 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1443 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1445 memcpy(runtime->dma_area + oldptr, cp, bytes);
1450 snd_pcm_period_elapsed(subs->pcm_substream);
1453 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1454 struct urb *urb, unsigned int bytes)
1456 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1457 unsigned int stride = runtime->frame_bits >> 3;
1458 unsigned int dst_idx = 0;
1459 unsigned int src_idx = subs->hwptr_done;
1460 unsigned int wrap = runtime->buffer_size * stride;
1461 u8 *dst = urb->transfer_buffer;
1462 u8 *src = runtime->dma_area;
1463 u8 marker[] = { 0x05, 0xfa };
1466 * The DSP DOP format defines a way to transport DSD samples over
1467 * normal PCM data endpoints. It requires stuffing of marker bytes
1468 * (0x05 and 0xfa, alternating per sample frame), and then expects
1469 * 2 additional bytes of actual payload. The whole frame is stored
1472 * Hence, for a stereo transport, the buffer layout looks like this,
1473 * where L refers to left channel samples and R to right.
1475 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1476 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1482 if (++subs->dsd_dop.byte_idx == 3) {
1483 /* frame boundary? */
1484 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1486 subs->dsd_dop.byte_idx = 0;
1488 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1489 /* alternate the marker */
1490 subs->dsd_dop.marker++;
1491 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1492 subs->dsd_dop.channel = 0;
1495 /* stuff the DSD payload */
1496 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1498 if (subs->cur_audiofmt->dsd_bitrev)
1499 dst[dst_idx++] = bitrev8(src[idx]);
1501 dst[dst_idx++] = src[idx];
1506 if (subs->hwptr_done >= runtime->buffer_size * stride)
1507 subs->hwptr_done -= runtime->buffer_size * stride;
1510 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1511 int offset, int stride, unsigned int bytes)
1513 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1515 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1516 /* err, the transferred area goes over buffer boundary. */
1517 unsigned int bytes1 =
1518 runtime->buffer_size * stride - subs->hwptr_done;
1519 memcpy(urb->transfer_buffer + offset,
1520 runtime->dma_area + subs->hwptr_done, bytes1);
1521 memcpy(urb->transfer_buffer + offset + bytes1,
1522 runtime->dma_area, bytes - bytes1);
1524 memcpy(urb->transfer_buffer + offset,
1525 runtime->dma_area + subs->hwptr_done, bytes);
1527 subs->hwptr_done += bytes;
1528 if (subs->hwptr_done >= runtime->buffer_size * stride)
1529 subs->hwptr_done -= runtime->buffer_size * stride;
1532 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1533 struct urb *urb, int stride,
1536 __le32 packet_length;
1539 /* Put __le32 length descriptor at start of each packet. */
1540 for (i = 0; i < urb->number_of_packets; i++) {
1541 unsigned int length = urb->iso_frame_desc[i].length;
1542 unsigned int offset = urb->iso_frame_desc[i].offset;
1544 packet_length = cpu_to_le32(length);
1545 offset += i * sizeof(packet_length);
1546 urb->iso_frame_desc[i].offset = offset;
1547 urb->iso_frame_desc[i].length += sizeof(packet_length);
1548 memcpy(urb->transfer_buffer + offset,
1549 &packet_length, sizeof(packet_length));
1550 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1553 /* Adjust transfer size accordingly. */
1554 bytes += urb->number_of_packets * sizeof(packet_length);
1558 static void prepare_playback_urb(struct snd_usb_substream *subs,
1561 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1562 struct snd_usb_endpoint *ep = subs->data_endpoint;
1563 struct snd_urb_ctx *ctx = urb->context;
1564 unsigned int counts, frames, bytes;
1565 int i, stride, period_elapsed = 0;
1566 unsigned long flags;
1568 stride = runtime->frame_bits >> 3;
1571 urb->number_of_packets = 0;
1572 spin_lock_irqsave(&subs->lock, flags);
1573 subs->frame_limit += ep->max_urb_frames;
1574 for (i = 0; i < ctx->packets; i++) {
1575 if (ctx->packet_size[i])
1576 counts = ctx->packet_size[i];
1578 counts = snd_usb_endpoint_next_packet_size(ep);
1580 /* set up descriptor */
1581 urb->iso_frame_desc[i].offset = frames * ep->stride;
1582 urb->iso_frame_desc[i].length = counts * ep->stride;
1584 urb->number_of_packets++;
1585 subs->transfer_done += counts;
1586 if (subs->transfer_done >= runtime->period_size) {
1587 subs->transfer_done -= runtime->period_size;
1588 subs->frame_limit = 0;
1590 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1591 if (subs->transfer_done > 0) {
1592 /* FIXME: fill-max mode is not
1594 frames -= subs->transfer_done;
1595 counts -= subs->transfer_done;
1596 urb->iso_frame_desc[i].length =
1597 counts * ep->stride;
1598 subs->transfer_done = 0;
1601 if (i < ctx->packets) {
1602 /* add a transfer delimiter */
1603 urb->iso_frame_desc[i].offset =
1604 frames * ep->stride;
1605 urb->iso_frame_desc[i].length = 0;
1606 urb->number_of_packets++;
1611 /* finish at the period boundary or after enough frames */
1612 if ((period_elapsed ||
1613 subs->transfer_done >= subs->frame_limit) &&
1614 !snd_usb_endpoint_implicit_feedback_sink(ep))
1617 bytes = frames * ep->stride;
1619 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1620 subs->cur_audiofmt->dsd_dop)) {
1621 fill_playback_urb_dsd_dop(subs, urb, bytes);
1622 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1623 subs->cur_audiofmt->dsd_bitrev)) {
1624 /* bit-reverse the bytes */
1625 u8 *buf = urb->transfer_buffer;
1626 for (i = 0; i < bytes; i++) {
1627 int idx = (subs->hwptr_done + i)
1628 % (runtime->buffer_size * stride);
1629 buf[i] = bitrev8(runtime->dma_area[idx]);
1632 subs->hwptr_done += bytes;
1633 if (subs->hwptr_done >= runtime->buffer_size * stride)
1634 subs->hwptr_done -= runtime->buffer_size * stride;
1637 if (!subs->tx_length_quirk)
1638 copy_to_urb(subs, urb, 0, stride, bytes);
1640 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1641 /* bytes is now amount of outgoing data */
1644 /* update delay with exact number of samples queued */
1645 runtime->delay = subs->last_delay;
1646 runtime->delay += frames;
1647 subs->last_delay = runtime->delay;
1649 /* realign last_frame_number */
1650 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1651 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1653 if (subs->trigger_tstamp_pending_update) {
1654 /* this is the first actual URB submitted,
1655 * update trigger timestamp to reflect actual start time
1657 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1658 subs->trigger_tstamp_pending_update = false;
1661 spin_unlock_irqrestore(&subs->lock, flags);
1662 urb->transfer_buffer_length = bytes;
1664 snd_pcm_period_elapsed(subs->pcm_substream);
1668 * process after playback data complete
1669 * - decrease the delay count again
1671 static void retire_playback_urb(struct snd_usb_substream *subs,
1674 unsigned long flags;
1675 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1676 struct snd_usb_endpoint *ep = subs->data_endpoint;
1677 int processed = urb->transfer_buffer_length / ep->stride;
1680 /* ignore the delay accounting when procssed=0 is given, i.e.
1681 * silent payloads are procssed before handling the actual data
1686 spin_lock_irqsave(&subs->lock, flags);
1687 if (!subs->last_delay)
1688 goto out; /* short path */
1690 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1691 /* update delay with exact number of samples played */
1692 if (processed > subs->last_delay)
1693 subs->last_delay = 0;
1695 subs->last_delay -= processed;
1696 runtime->delay = subs->last_delay;
1699 * Report when delay estimate is off by more than 2ms.
1700 * The error should be lower than 2ms since the estimate relies
1701 * on two reads of a counter updated every ms.
1703 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1704 dev_dbg_ratelimited(&subs->dev->dev,
1705 "delay: estimated %d, actual %d\n",
1706 est_delay, subs->last_delay);
1708 if (!subs->running) {
1709 /* update last_frame_number for delay counting here since
1710 * prepare_playback_urb won't be called during pause
1712 subs->last_frame_number =
1713 usb_get_current_frame_number(subs->dev) & 0xff;
1717 spin_unlock_irqrestore(&subs->lock, flags);
1720 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1723 struct snd_usb_substream *subs = substream->runtime->private_data;
1726 case SNDRV_PCM_TRIGGER_START:
1727 subs->trigger_tstamp_pending_update = true;
1729 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1730 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1731 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1734 case SNDRV_PCM_TRIGGER_STOP:
1735 stop_endpoints(subs);
1738 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1739 subs->data_endpoint->prepare_data_urb = NULL;
1740 /* keep retire_data_urb for delay calculation */
1741 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1744 case SNDRV_PCM_TRIGGER_SUSPEND:
1745 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1746 stop_endpoints(subs);
1747 subs->need_setup_fmt = true;
1756 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1760 struct snd_usb_substream *subs = substream->runtime->private_data;
1763 case SNDRV_PCM_TRIGGER_START:
1764 err = start_endpoints(subs);
1768 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1771 case SNDRV_PCM_TRIGGER_STOP:
1772 stop_endpoints(subs);
1775 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1776 subs->data_endpoint->retire_data_urb = NULL;
1779 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1780 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1783 case SNDRV_PCM_TRIGGER_SUSPEND:
1784 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1785 stop_endpoints(subs);
1786 subs->need_setup_fmt = true;
1795 static const struct snd_pcm_ops snd_usb_playback_ops = {
1796 .open = snd_usb_pcm_open,
1797 .close = snd_usb_pcm_close,
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 .sync_stop = snd_usb_pcm_sync_stop,
1803 .pointer = snd_usb_pcm_pointer,
1806 static const struct snd_pcm_ops snd_usb_capture_ops = {
1807 .open = snd_usb_pcm_open,
1808 .close = snd_usb_pcm_close,
1809 .hw_params = snd_usb_hw_params,
1810 .hw_free = snd_usb_hw_free,
1811 .prepare = snd_usb_pcm_prepare,
1812 .trigger = snd_usb_substream_capture_trigger,
1813 .sync_stop = snd_usb_pcm_sync_stop,
1814 .pointer = snd_usb_pcm_pointer,
1817 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1819 const struct snd_pcm_ops *ops;
1821 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1822 &snd_usb_playback_ops : &snd_usb_capture_ops;
1823 snd_pcm_set_ops(pcm, stream, ops);
1826 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1828 struct snd_pcm *pcm = subs->stream->pcm;
1829 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1830 struct device *dev = subs->dev->bus->controller;
1832 if (snd_usb_use_vmalloc)
1833 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1836 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1837 dev, 64*1024, 512*1024);