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 static snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
33 struct snd_pcm_runtime *runtime)
35 unsigned int current_frame_number;
36 unsigned int frame_diff;
40 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
41 queued = bytes_to_frames(runtime, subs->inflight_bytes);
44 } else if (!subs->running) {
48 current_frame_number = usb_get_current_frame_number(subs->dev);
50 * HCD implementations use different widths, use lower 8 bits.
51 * The delay will be managed up to 256ms, which is more than
54 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
56 /* Approximation based on number of samples per USB frame (ms),
57 some truncation for 44.1 but the estimate is good enough */
58 est_delay = frame_diff * runtime->rate / 1000;
60 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
61 est_delay = queued - est_delay;
70 * return the current pcm pointer. just based on the hwptr_done value.
72 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
74 struct snd_pcm_runtime *runtime = substream->runtime;
75 struct snd_usb_substream *subs = runtime->private_data;
76 unsigned int hwptr_done;
78 if (atomic_read(&subs->stream->chip->shutdown))
79 return SNDRV_PCM_POS_XRUN;
80 spin_lock(&subs->lock);
81 hwptr_done = subs->hwptr_done;
82 runtime->delay = snd_usb_pcm_delay(subs, runtime);
83 spin_unlock(&subs->lock);
84 return bytes_to_frames(runtime, hwptr_done);
88 * find a matching audio format
90 static const struct audioformat *
91 find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
92 unsigned int rate, unsigned int channels, bool strict_match,
93 struct snd_usb_substream *subs)
95 const struct audioformat *fp;
96 const struct audioformat *found = NULL;
97 int cur_attr = 0, attr;
99 list_for_each_entry(fp, fmt_list_head, list) {
101 if (!(fp->formats & pcm_format_to_bits(format)))
103 if (fp->channels != channels)
106 if (rate < fp->rate_min || rate > fp->rate_max)
108 if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
110 for (i = 0; i < fp->nr_rates; i++)
111 if (fp->rate_table[i] == rate)
113 if (i >= fp->nr_rates)
116 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
122 /* avoid async out and adaptive in if the other method
123 * supports the same format.
124 * this is a workaround for the case like
125 * M-audio audiophile USB.
127 if (subs && attr != cur_attr) {
128 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
129 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
130 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
131 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
133 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
134 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
135 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
136 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
142 /* find the format with the largest max. packet size */
143 if (fp->maxpacksize > found->maxpacksize) {
151 static const struct audioformat *
152 find_substream_format(struct snd_usb_substream *subs,
153 const struct snd_pcm_hw_params *params)
155 return find_format(&subs->fmt_list, params_format(params),
156 params_rate(params), params_channels(params),
160 static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
162 struct usb_device *dev = chip->dev;
163 unsigned char data[1];
167 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
168 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
169 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
174 static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
176 struct usb_device *dev = chip->dev;
177 unsigned char data[1];
181 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
182 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
183 UAC2_EP_CS_PITCH << 8, 0,
189 * initialize the pitch control and sample rate
191 int snd_usb_init_pitch(struct snd_usb_audio *chip,
192 const struct audioformat *fmt)
196 /* if endpoint doesn't have pitch control, bail out */
197 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
200 usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
202 switch (fmt->protocol) {
204 err = init_pitch_v1(chip, fmt->endpoint);
207 err = init_pitch_v2(chip, fmt->endpoint);
214 usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
222 static bool stop_endpoints(struct snd_usb_substream *subs, bool keep_pending)
226 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
227 snd_usb_endpoint_stop(subs->sync_endpoint, keep_pending);
230 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
231 snd_usb_endpoint_stop(subs->data_endpoint, keep_pending);
237 static int start_endpoints(struct snd_usb_substream *subs)
241 if (!subs->data_endpoint)
244 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
245 err = snd_usb_endpoint_start(subs->data_endpoint);
247 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
252 if (subs->sync_endpoint &&
253 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
254 err = snd_usb_endpoint_start(subs->sync_endpoint);
256 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
264 stop_endpoints(subs, false);
268 static void sync_pending_stops(struct snd_usb_substream *subs)
270 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
271 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
274 /* PCM sync_stop callback */
275 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
277 struct snd_usb_substream *subs = substream->runtime->private_data;
279 sync_pending_stops(subs);
283 /* Set up sync endpoint */
284 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
285 struct audioformat *fmt)
287 struct usb_device *dev = chip->dev;
288 struct usb_host_interface *alts;
289 struct usb_interface_descriptor *altsd;
290 unsigned int ep, attr, sync_attr;
295 return 0; /* already set up */
297 alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
300 altsd = get_iface_desc(alts);
302 err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
304 return 0; /* matched */
307 * Generic sync EP handling
310 if (fmt->ep_idx > 0 || altsd->bNumEndpoints < 2)
313 is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
314 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
315 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
316 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
317 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
320 sync_attr = get_endpoint(alts, 1)->bmAttributes;
323 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
324 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
325 * error fall back to SYNC mode and don't create sync endpoint
328 /* check sync-pipe endpoint */
329 /* ... and check descriptor size before accessing bSynchAddress
330 because there is a version of the SB Audigy 2 NX firmware lacking
331 the audio fields in the endpoint descriptors */
332 if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
333 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
334 get_endpoint(alts, 1)->bSynchAddress != 0)) {
336 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
337 fmt->iface, fmt->altsetting,
338 get_endpoint(alts, 1)->bmAttributes,
339 get_endpoint(alts, 1)->bLength,
340 get_endpoint(alts, 1)->bSynchAddress);
341 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
345 ep = get_endpoint(alts, 1)->bEndpointAddress;
346 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
347 get_endpoint(alts, 0)->bSynchAddress != 0 &&
348 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
349 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
351 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
352 fmt->iface, fmt->altsetting,
353 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
354 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
360 fmt->sync_iface = altsd->bInterfaceNumber;
361 fmt->sync_altsetting = altsd->bAlternateSetting;
362 fmt->sync_ep_idx = 1;
363 if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
364 fmt->implicit_fb = 1;
366 dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
367 fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
368 fmt->sync_altsetting, fmt->implicit_fb);
373 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
380 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
382 dev_err(&subs->dev->dev,
383 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
384 subs->str_pd->pd_id, state, ret);
391 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
395 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
399 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
406 int snd_usb_pcm_resume(struct snd_usb_stream *as)
410 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
414 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
421 static void close_endpoints(struct snd_usb_audio *chip,
422 struct snd_usb_substream *subs)
424 if (subs->data_endpoint) {
425 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
426 snd_usb_endpoint_close(chip, subs->data_endpoint);
427 subs->data_endpoint = NULL;
430 if (subs->sync_endpoint) {
431 snd_usb_endpoint_close(chip, subs->sync_endpoint);
432 subs->sync_endpoint = NULL;
436 static int configure_endpoints(struct snd_usb_audio *chip,
437 struct snd_usb_substream *subs)
441 if (subs->data_endpoint->need_setup) {
442 /* stop any running stream beforehand */
443 if (stop_endpoints(subs, false))
444 sync_pending_stops(subs);
445 if (subs->sync_endpoint) {
446 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
450 err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
453 snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
455 if (subs->sync_endpoint) {
456 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
468 * allocate a buffer and set the given audio format.
470 * so far we use a physically linear buffer although packetize transfer
471 * doesn't need a continuous area.
472 * if sg buffer is supported on the later version of alsa, we'll follow
475 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
476 struct snd_pcm_hw_params *hw_params)
478 struct snd_usb_substream *subs = substream->runtime->private_data;
479 struct snd_usb_audio *chip = subs->stream->chip;
480 const struct audioformat *fmt;
481 const struct audioformat *sync_fmt;
484 ret = snd_media_start_pipeline(subs);
488 fmt = find_substream_format(subs, hw_params);
491 "cannot find format: format=%s, rate=%d, channels=%d\n",
492 snd_pcm_format_name(params_format(hw_params)),
493 params_rate(hw_params), params_channels(hw_params));
498 if (fmt->implicit_fb) {
499 sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
504 "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
505 fmt->sync_ep, fmt->sync_iface,
506 fmt->sync_altsetting,
507 snd_pcm_format_name(params_format(hw_params)),
508 params_rate(hw_params), params_channels(hw_params));
516 ret = snd_usb_lock_shutdown(chip);
520 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
524 if (subs->data_endpoint) {
525 if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
528 close_endpoints(chip, subs);
531 subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false);
532 if (!subs->data_endpoint) {
538 subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
541 if (!subs->sync_endpoint) {
546 snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
547 subs->sync_endpoint);
550 mutex_lock(&chip->mutex);
551 subs->cur_audiofmt = fmt;
552 mutex_unlock(&chip->mutex);
554 ret = configure_endpoints(chip, subs);
558 close_endpoints(chip, subs);
560 snd_usb_unlock_shutdown(chip);
563 snd_media_stop_pipeline(subs);
571 * reset the audio format and release the buffer
573 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
575 struct snd_usb_substream *subs = substream->runtime->private_data;
576 struct snd_usb_audio *chip = subs->stream->chip;
578 snd_media_stop_pipeline(subs);
579 mutex_lock(&chip->mutex);
580 subs->cur_audiofmt = NULL;
581 mutex_unlock(&chip->mutex);
582 if (!snd_usb_lock_shutdown(chip)) {
583 if (stop_endpoints(subs, false))
584 sync_pending_stops(subs);
585 close_endpoints(chip, subs);
586 snd_usb_unlock_shutdown(chip);
592 /* free-wheeling mode? (e.g. dmix) */
593 static int in_free_wheeling_mode(struct snd_pcm_runtime *runtime)
595 return runtime->stop_threshold > runtime->buffer_size;
598 /* check whether early start is needed for playback stream */
599 static int lowlatency_playback_available(struct snd_pcm_runtime *runtime,
600 struct snd_usb_substream *subs)
602 struct snd_usb_audio *chip = subs->stream->chip;
604 if (subs->direction == SNDRV_PCM_STREAM_CAPTURE)
606 /* disabled via module option? */
607 if (!chip->lowlatency)
609 if (in_free_wheeling_mode(runtime))
611 /* implicit feedback mode has own operation mode */
612 if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint))
620 * only a few subtle things...
622 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
624 struct snd_pcm_runtime *runtime = substream->runtime;
625 struct snd_usb_substream *subs = runtime->private_data;
626 struct snd_usb_audio *chip = subs->stream->chip;
629 ret = snd_usb_lock_shutdown(chip);
632 if (snd_BUG_ON(!subs->data_endpoint)) {
637 ret = configure_endpoints(chip, subs);
641 /* reset the pointer */
642 subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
643 subs->inflight_bytes = 0;
644 subs->hwptr_done = 0;
645 subs->transfer_done = 0;
646 subs->last_frame_number = 0;
647 subs->period_elapsed_pending = 0;
650 subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
651 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
652 !subs->lowlatency_playback)
653 ret = start_endpoints(subs);
656 snd_usb_unlock_shutdown(chip);
664 #ifdef HW_CONST_DEBUG
665 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
667 #define hwc_debug(fmt, args...) do { } while(0)
670 static const struct snd_pcm_hardware snd_usb_hardware =
672 .info = SNDRV_PCM_INFO_MMAP |
673 SNDRV_PCM_INFO_MMAP_VALID |
674 SNDRV_PCM_INFO_BATCH |
675 SNDRV_PCM_INFO_INTERLEAVED |
676 SNDRV_PCM_INFO_BLOCK_TRANSFER |
677 SNDRV_PCM_INFO_PAUSE,
680 .buffer_bytes_max = INT_MAX, /* limited by BUFFER_TIME later */
681 .period_bytes_min = 64,
682 .period_bytes_max = INT_MAX, /* limited by PERIOD_TIME later */
687 static int hw_check_valid_format(struct snd_usb_substream *subs,
688 struct snd_pcm_hw_params *params,
689 const struct audioformat *fp)
691 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
692 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
693 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
694 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
695 struct snd_mask check_fmts;
698 /* check the format */
699 snd_mask_none(&check_fmts);
700 check_fmts.bits[0] = (u32)fp->formats;
701 check_fmts.bits[1] = (u32)(fp->formats >> 32);
702 snd_mask_intersect(&check_fmts, fmts);
703 if (snd_mask_empty(&check_fmts)) {
704 hwc_debug(" > check: no supported format 0x%llx\n", fp->formats);
707 /* check the channels */
708 if (fp->channels < ct->min || fp->channels > ct->max) {
709 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
712 /* check the rate is within the range */
713 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
714 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
717 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
718 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
721 /* check whether the period time is >= the data packet interval */
722 if (subs->speed != USB_SPEED_FULL) {
723 ptime = 125 * (1 << fp->datainterval);
724 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
725 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
732 static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
738 hwc_debug(" --> get empty\n");
744 if (it->min < rmin) {
749 if (it->max > rmax) {
754 if (snd_interval_checkempty(it)) {
758 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
762 static int hw_rule_rate(struct snd_pcm_hw_params *params,
763 struct snd_pcm_hw_rule *rule)
765 struct snd_usb_substream *subs = rule->private;
766 struct snd_usb_audio *chip = subs->stream->chip;
767 const struct audioformat *fp;
768 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
769 unsigned int rmin, rmax, r;
772 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
775 list_for_each_entry(fp, &subs->fmt_list, list) {
776 if (!hw_check_valid_format(subs, params, fp))
778 r = snd_usb_endpoint_get_clock_rate(chip, fp->clock);
780 if (!snd_interval_test(it, r))
786 if (fp->rate_table && fp->nr_rates) {
787 for (i = 0; i < fp->nr_rates; i++) {
788 r = fp->rate_table[i];
789 if (!snd_interval_test(it, r))
795 rmin = min(rmin, fp->rate_min);
796 rmax = max(rmax, fp->rate_max);
800 return apply_hw_params_minmax(it, rmin, rmax);
804 static int hw_rule_channels(struct snd_pcm_hw_params *params,
805 struct snd_pcm_hw_rule *rule)
807 struct snd_usb_substream *subs = rule->private;
808 const struct audioformat *fp;
809 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
810 unsigned int rmin, rmax;
812 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
815 list_for_each_entry(fp, &subs->fmt_list, list) {
816 if (!hw_check_valid_format(subs, params, fp))
818 rmin = min(rmin, fp->channels);
819 rmax = max(rmax, fp->channels);
822 return apply_hw_params_minmax(it, rmin, rmax);
825 static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits)
830 oldbits[0] = fmt->bits[0];
831 oldbits[1] = fmt->bits[1];
832 fmt->bits[0] &= (u32)fbits;
833 fmt->bits[1] &= (u32)(fbits >> 32);
834 if (!fmt->bits[0] && !fmt->bits[1]) {
835 hwc_debug(" --> get empty\n");
838 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
839 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
843 static int hw_rule_format(struct snd_pcm_hw_params *params,
844 struct snd_pcm_hw_rule *rule)
846 struct snd_usb_substream *subs = rule->private;
847 const struct audioformat *fp;
848 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
851 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
853 list_for_each_entry(fp, &subs->fmt_list, list) {
854 if (!hw_check_valid_format(subs, params, fp))
856 fbits |= fp->formats;
858 return apply_hw_params_format_bits(fmt, fbits);
861 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
862 struct snd_pcm_hw_rule *rule)
864 struct snd_usb_substream *subs = rule->private;
865 const struct audioformat *fp;
866 struct snd_interval *it;
867 unsigned char min_datainterval;
870 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
871 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
872 min_datainterval = 0xff;
873 list_for_each_entry(fp, &subs->fmt_list, list) {
874 if (!hw_check_valid_format(subs, params, fp))
876 min_datainterval = min(min_datainterval, fp->datainterval);
878 if (min_datainterval == 0xff) {
879 hwc_debug(" --> get empty\n");
883 pmin = 125 * (1 << min_datainterval);
885 return apply_hw_params_minmax(it, pmin, UINT_MAX);
888 /* get the EP or the sync EP for implicit fb when it's already set up */
889 static const struct snd_usb_endpoint *
890 get_sync_ep_from_substream(struct snd_usb_substream *subs)
892 struct snd_usb_audio *chip = subs->stream->chip;
893 const struct audioformat *fp;
894 const struct snd_usb_endpoint *ep;
896 list_for_each_entry(fp, &subs->fmt_list, list) {
897 ep = snd_usb_get_endpoint(chip, fp->endpoint);
898 if (ep && ep->cur_audiofmt) {
899 /* if EP is already opened solely for this substream,
900 * we still allow us to change the parameter; otherwise
901 * this substream has to follow the existing parameter
903 if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1)
906 if (!fp->implicit_fb)
908 /* for the implicit fb, check the sync ep as well */
909 ep = snd_usb_get_endpoint(chip, fp->sync_ep);
910 if (ep && ep->cur_audiofmt)
916 /* additional hw constraints for implicit feedback mode */
917 static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params,
918 struct snd_pcm_hw_rule *rule)
920 struct snd_usb_substream *subs = rule->private;
921 const struct snd_usb_endpoint *ep;
922 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
924 ep = get_sync_ep_from_substream(subs);
928 hwc_debug("applying %s\n", __func__);
929 return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format));
932 static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params,
933 struct snd_pcm_hw_rule *rule)
935 struct snd_usb_substream *subs = rule->private;
936 const struct snd_usb_endpoint *ep;
937 struct snd_interval *it;
939 ep = get_sync_ep_from_substream(subs);
943 hwc_debug("applying %s\n", __func__);
944 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
945 return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate);
948 static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params,
949 struct snd_pcm_hw_rule *rule)
951 struct snd_usb_substream *subs = rule->private;
952 const struct snd_usb_endpoint *ep;
953 struct snd_interval *it;
955 ep = get_sync_ep_from_substream(subs);
959 hwc_debug("applying %s\n", __func__);
960 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
961 return apply_hw_params_minmax(it, ep->cur_period_frames,
962 ep->cur_period_frames);
965 static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params,
966 struct snd_pcm_hw_rule *rule)
968 struct snd_usb_substream *subs = rule->private;
969 const struct snd_usb_endpoint *ep;
970 struct snd_interval *it;
972 ep = get_sync_ep_from_substream(subs);
976 hwc_debug("applying %s\n", __func__);
977 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS);
978 return apply_hw_params_minmax(it, ep->cur_buffer_periods,
979 ep->cur_buffer_periods);
983 * set up the runtime hardware information.
986 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
988 const struct audioformat *fp;
989 unsigned int pt, ptmin;
990 int param_period_time_if_needed = -1;
993 runtime->hw.formats = subs->formats;
995 runtime->hw.rate_min = 0x7fffffff;
996 runtime->hw.rate_max = 0;
997 runtime->hw.channels_min = 256;
998 runtime->hw.channels_max = 0;
999 runtime->hw.rates = 0;
1001 /* check min/max rates and channels */
1002 list_for_each_entry(fp, &subs->fmt_list, list) {
1003 runtime->hw.rates |= fp->rates;
1004 if (runtime->hw.rate_min > fp->rate_min)
1005 runtime->hw.rate_min = fp->rate_min;
1006 if (runtime->hw.rate_max < fp->rate_max)
1007 runtime->hw.rate_max = fp->rate_max;
1008 if (runtime->hw.channels_min > fp->channels)
1009 runtime->hw.channels_min = fp->channels;
1010 if (runtime->hw.channels_max < fp->channels)
1011 runtime->hw.channels_max = fp->channels;
1012 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1013 /* FIXME: there might be more than one audio formats... */
1014 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1017 pt = 125 * (1 << fp->datainterval);
1018 ptmin = min(ptmin, pt);
1021 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1022 if (subs->speed == USB_SPEED_FULL)
1023 /* full speed devices have fixed data packet interval */
1026 /* if period time doesn't go below 1 ms, no rules needed */
1027 param_period_time_if_needed = -1;
1029 err = snd_pcm_hw_constraint_minmax(runtime,
1030 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1035 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1037 SNDRV_PCM_HW_PARAM_RATE,
1038 SNDRV_PCM_HW_PARAM_FORMAT,
1039 SNDRV_PCM_HW_PARAM_CHANNELS,
1040 param_period_time_if_needed,
1045 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1046 hw_rule_channels, subs,
1047 SNDRV_PCM_HW_PARAM_CHANNELS,
1048 SNDRV_PCM_HW_PARAM_FORMAT,
1049 SNDRV_PCM_HW_PARAM_RATE,
1050 param_period_time_if_needed,
1054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1055 hw_rule_format, subs,
1056 SNDRV_PCM_HW_PARAM_FORMAT,
1057 SNDRV_PCM_HW_PARAM_RATE,
1058 SNDRV_PCM_HW_PARAM_CHANNELS,
1059 param_period_time_if_needed,
1063 if (param_period_time_if_needed >= 0) {
1064 err = snd_pcm_hw_rule_add(runtime, 0,
1065 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1066 hw_rule_period_time, subs,
1067 SNDRV_PCM_HW_PARAM_FORMAT,
1068 SNDRV_PCM_HW_PARAM_CHANNELS,
1069 SNDRV_PCM_HW_PARAM_RATE,
1075 /* set max period and buffer sizes for 1 and 2 seconds, respectively */
1076 err = snd_pcm_hw_constraint_minmax(runtime,
1077 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1081 err = snd_pcm_hw_constraint_minmax(runtime,
1082 SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1087 /* additional hw constraints for implicit fb */
1088 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1089 hw_rule_format_implicit_fb, subs,
1090 SNDRV_PCM_HW_PARAM_FORMAT, -1);
1093 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1094 hw_rule_rate_implicit_fb, subs,
1095 SNDRV_PCM_HW_PARAM_RATE, -1);
1098 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1099 hw_rule_period_size_implicit_fb, subs,
1100 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1103 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1104 hw_rule_periods_implicit_fb, subs,
1105 SNDRV_PCM_HW_PARAM_PERIODS, -1);
1112 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1114 int direction = substream->stream;
1115 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1116 struct snd_pcm_runtime *runtime = substream->runtime;
1117 struct snd_usb_substream *subs = &as->substream[direction];
1120 runtime->hw = snd_usb_hardware;
1121 /* need an explicit sync to catch applptr update in low-latency mode */
1122 if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
1123 as->chip->lowlatency)
1124 runtime->hw.info |= SNDRV_PCM_INFO_SYNC_APPLPTR;
1125 runtime->private_data = subs;
1126 subs->pcm_substream = substream;
1127 /* runtime PM is also done there */
1129 /* initialize DSD/DOP context */
1130 subs->dsd_dop.byte_idx = 0;
1131 subs->dsd_dop.channel = 0;
1132 subs->dsd_dop.marker = 1;
1134 ret = setup_hw_info(runtime, subs);
1137 ret = snd_usb_autoresume(subs->stream->chip);
1140 ret = snd_media_stream_init(subs, as->pcm, direction);
1142 snd_usb_autosuspend(subs->stream->chip);
1146 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1148 int direction = substream->stream;
1149 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1150 struct snd_usb_substream *subs = &as->substream[direction];
1153 snd_media_stop_pipeline(subs);
1155 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
1156 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1157 snd_usb_unlock_shutdown(subs->stream->chip);
1162 subs->pcm_substream = NULL;
1163 snd_usb_autosuspend(subs->stream->chip);
1168 /* Since a URB can handle only a single linear buffer, we must use double
1169 * buffering when the data to be transferred overflows the buffer boundary.
1170 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1173 static void retire_capture_urb(struct snd_usb_substream *subs,
1176 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1177 unsigned int stride, frames, bytes, oldptr;
1178 int i, period_elapsed = 0;
1179 unsigned long flags;
1181 int current_frame_number;
1183 /* read frame number here, update pointer in critical section */
1184 current_frame_number = usb_get_current_frame_number(subs->dev);
1186 stride = runtime->frame_bits >> 3;
1188 for (i = 0; i < urb->number_of_packets; i++) {
1189 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1190 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1191 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1192 i, urb->iso_frame_desc[i].status);
1195 bytes = urb->iso_frame_desc[i].actual_length;
1196 if (subs->stream_offset_adj > 0) {
1197 unsigned int adj = min(subs->stream_offset_adj, bytes);
1200 subs->stream_offset_adj -= adj;
1202 frames = bytes / stride;
1203 if (!subs->txfr_quirk)
1204 bytes = frames * stride;
1205 if (bytes % (runtime->sample_bits >> 3) != 0) {
1206 int oldbytes = bytes;
1207 bytes = frames * stride;
1208 dev_warn_ratelimited(&subs->dev->dev,
1209 "Corrected urb data len. %d->%d\n",
1212 /* update the current pointer */
1213 spin_lock_irqsave(&subs->lock, flags);
1214 oldptr = subs->hwptr_done;
1215 subs->hwptr_done += bytes;
1216 if (subs->hwptr_done >= subs->buffer_bytes)
1217 subs->hwptr_done -= subs->buffer_bytes;
1218 frames = (bytes + (oldptr % stride)) / stride;
1219 subs->transfer_done += frames;
1220 if (subs->transfer_done >= runtime->period_size) {
1221 subs->transfer_done -= runtime->period_size;
1225 /* realign last_frame_number */
1226 subs->last_frame_number = current_frame_number;
1228 spin_unlock_irqrestore(&subs->lock, flags);
1229 /* copy a data chunk */
1230 if (oldptr + bytes > subs->buffer_bytes) {
1231 unsigned int bytes1 = subs->buffer_bytes - oldptr;
1233 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1234 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1236 memcpy(runtime->dma_area + oldptr, cp, bytes);
1241 snd_pcm_period_elapsed(subs->pcm_substream);
1244 static void urb_ctx_queue_advance(struct snd_usb_substream *subs,
1245 struct urb *urb, unsigned int bytes)
1247 struct snd_urb_ctx *ctx = urb->context;
1249 ctx->queued += bytes;
1250 subs->inflight_bytes += bytes;
1251 subs->hwptr_done += bytes;
1252 if (subs->hwptr_done >= subs->buffer_bytes)
1253 subs->hwptr_done -= subs->buffer_bytes;
1256 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1257 struct urb *urb, unsigned int bytes)
1259 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1260 unsigned int dst_idx = 0;
1261 unsigned int src_idx = subs->hwptr_done;
1262 unsigned int wrap = subs->buffer_bytes;
1263 u8 *dst = urb->transfer_buffer;
1264 u8 *src = runtime->dma_area;
1265 u8 marker[] = { 0x05, 0xfa };
1266 unsigned int queued = 0;
1269 * The DSP DOP format defines a way to transport DSD samples over
1270 * normal PCM data endpoints. It requires stuffing of marker bytes
1271 * (0x05 and 0xfa, alternating per sample frame), and then expects
1272 * 2 additional bytes of actual payload. The whole frame is stored
1275 * Hence, for a stereo transport, the buffer layout looks like this,
1276 * where L refers to left channel samples and R to right.
1278 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1279 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1285 if (++subs->dsd_dop.byte_idx == 3) {
1286 /* frame boundary? */
1287 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1289 subs->dsd_dop.byte_idx = 0;
1291 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1292 /* alternate the marker */
1293 subs->dsd_dop.marker++;
1294 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1295 subs->dsd_dop.channel = 0;
1298 /* stuff the DSD payload */
1299 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1301 if (subs->cur_audiofmt->dsd_bitrev)
1302 dst[dst_idx++] = bitrev8(src[idx]);
1304 dst[dst_idx++] = src[idx];
1309 urb_ctx_queue_advance(subs, urb, queued);
1312 /* copy bit-reversed bytes onto transfer buffer */
1313 static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs,
1314 struct urb *urb, unsigned int bytes)
1316 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1317 const u8 *src = runtime->dma_area;
1318 u8 *buf = urb->transfer_buffer;
1319 int i, ofs = subs->hwptr_done;
1321 for (i = 0; i < bytes; i++) {
1322 *buf++ = bitrev8(src[ofs]);
1323 if (++ofs >= subs->buffer_bytes)
1327 urb_ctx_queue_advance(subs, urb, bytes);
1330 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1331 int offset, int stride, unsigned int bytes)
1333 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1335 if (subs->hwptr_done + bytes > subs->buffer_bytes) {
1336 /* err, the transferred area goes over buffer boundary. */
1337 unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done;
1339 memcpy(urb->transfer_buffer + offset,
1340 runtime->dma_area + subs->hwptr_done, bytes1);
1341 memcpy(urb->transfer_buffer + offset + bytes1,
1342 runtime->dma_area, bytes - bytes1);
1344 memcpy(urb->transfer_buffer + offset,
1345 runtime->dma_area + subs->hwptr_done, bytes);
1348 urb_ctx_queue_advance(subs, urb, bytes);
1351 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1352 struct urb *urb, int stride,
1355 __le32 packet_length;
1358 /* Put __le32 length descriptor at start of each packet. */
1359 for (i = 0; i < urb->number_of_packets; i++) {
1360 unsigned int length = urb->iso_frame_desc[i].length;
1361 unsigned int offset = urb->iso_frame_desc[i].offset;
1363 packet_length = cpu_to_le32(length);
1364 offset += i * sizeof(packet_length);
1365 urb->iso_frame_desc[i].offset = offset;
1366 urb->iso_frame_desc[i].length += sizeof(packet_length);
1367 memcpy(urb->transfer_buffer + offset,
1368 &packet_length, sizeof(packet_length));
1369 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1372 /* Adjust transfer size accordingly. */
1373 bytes += urb->number_of_packets * sizeof(packet_length);
1377 static int prepare_playback_urb(struct snd_usb_substream *subs,
1379 bool in_stream_lock)
1381 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1382 struct snd_usb_endpoint *ep = subs->data_endpoint;
1383 struct snd_urb_ctx *ctx = urb->context;
1384 unsigned int frames, bytes;
1386 unsigned int transfer_done, frame_limit, avail = 0;
1387 int i, stride, period_elapsed = 0;
1388 unsigned long flags;
1391 stride = ep->stride;
1395 urb->number_of_packets = 0;
1397 spin_lock_irqsave(&subs->lock, flags);
1398 frame_limit = subs->frame_limit + ep->max_urb_frames;
1399 transfer_done = subs->transfer_done;
1401 if (subs->lowlatency_playback &&
1402 runtime->status->state != SNDRV_PCM_STATE_DRAINING) {
1403 unsigned int hwptr = subs->hwptr_done / stride;
1405 /* calculate the byte offset-in-buffer of the appl_ptr */
1406 avail = (runtime->control->appl_ptr - runtime->hw_ptr_base)
1407 % runtime->buffer_size;
1409 avail += runtime->buffer_size;
1413 for (i = 0; i < ctx->packets; i++) {
1414 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i, avail);
1417 /* set up descriptor */
1418 urb->iso_frame_desc[i].offset = frames * stride;
1419 urb->iso_frame_desc[i].length = counts * stride;
1422 urb->number_of_packets++;
1423 transfer_done += counts;
1424 if (transfer_done >= runtime->period_size) {
1425 transfer_done -= runtime->period_size;
1428 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1429 if (transfer_done > 0) {
1430 /* FIXME: fill-max mode is not
1432 frames -= transfer_done;
1433 counts -= transfer_done;
1434 urb->iso_frame_desc[i].length =
1439 if (i < ctx->packets) {
1440 /* add a transfer delimiter */
1441 urb->iso_frame_desc[i].offset =
1443 urb->iso_frame_desc[i].length = 0;
1444 urb->number_of_packets++;
1449 /* finish at the period boundary or after enough frames */
1450 if ((period_elapsed || transfer_done >= frame_limit) &&
1451 !snd_usb_endpoint_implicit_feedback_sink(ep))
1460 bytes = frames * stride;
1461 subs->transfer_done = transfer_done;
1462 subs->frame_limit = frame_limit;
1463 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1464 subs->cur_audiofmt->dsd_dop)) {
1465 fill_playback_urb_dsd_dop(subs, urb, bytes);
1466 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1467 subs->cur_audiofmt->dsd_bitrev)) {
1468 fill_playback_urb_dsd_bitrev(subs, urb, bytes);
1471 if (!subs->tx_length_quirk)
1472 copy_to_urb(subs, urb, 0, stride, bytes);
1474 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1475 /* bytes is now amount of outgoing data */
1478 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1480 if (subs->trigger_tstamp_pending_update) {
1481 /* this is the first actual URB submitted,
1482 * update trigger timestamp to reflect actual start time
1484 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1485 subs->trigger_tstamp_pending_update = false;
1488 if (period_elapsed && !subs->running && subs->lowlatency_playback) {
1489 subs->period_elapsed_pending = 1;
1494 spin_unlock_irqrestore(&subs->lock, flags);
1497 urb->transfer_buffer_length = bytes;
1498 if (period_elapsed) {
1500 snd_pcm_period_elapsed_under_stream_lock(subs->pcm_substream);
1502 snd_pcm_period_elapsed(subs->pcm_substream);
1508 * process after playback data complete
1509 * - decrease the delay count again
1511 static void retire_playback_urb(struct snd_usb_substream *subs,
1514 unsigned long flags;
1515 struct snd_urb_ctx *ctx = urb->context;
1516 bool period_elapsed = false;
1518 spin_lock_irqsave(&subs->lock, flags);
1520 if (subs->inflight_bytes >= ctx->queued)
1521 subs->inflight_bytes -= ctx->queued;
1523 subs->inflight_bytes = 0;
1526 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1527 if (subs->running) {
1528 period_elapsed = subs->period_elapsed_pending;
1529 subs->period_elapsed_pending = 0;
1531 spin_unlock_irqrestore(&subs->lock, flags);
1533 snd_pcm_period_elapsed(subs->pcm_substream);
1536 /* PCM ack callback for the playback stream;
1537 * this plays a role only when the stream is running in low-latency mode.
1539 static int snd_usb_pcm_playback_ack(struct snd_pcm_substream *substream)
1541 struct snd_usb_substream *subs = substream->runtime->private_data;
1542 struct snd_usb_endpoint *ep;
1544 if (!subs->lowlatency_playback || !subs->running)
1546 ep = subs->data_endpoint;
1549 /* When no more in-flight URBs available, try to process the pending
1552 if (!ep->active_mask)
1553 snd_usb_queue_pending_output_urbs(ep, true);
1557 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1560 struct snd_usb_substream *subs = substream->runtime->private_data;
1564 case SNDRV_PCM_TRIGGER_START:
1565 subs->trigger_tstamp_pending_update = true;
1567 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1568 snd_usb_endpoint_set_callback(subs->data_endpoint,
1569 prepare_playback_urb,
1570 retire_playback_urb,
1572 if (subs->lowlatency_playback &&
1573 cmd == SNDRV_PCM_TRIGGER_START) {
1574 if (in_free_wheeling_mode(substream->runtime))
1575 subs->lowlatency_playback = false;
1576 err = start_endpoints(subs);
1578 snd_usb_endpoint_set_callback(subs->data_endpoint,
1584 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
1585 subs->cur_audiofmt->iface,
1586 subs->cur_audiofmt->altsetting);
1588 case SNDRV_PCM_TRIGGER_SUSPEND:
1589 case SNDRV_PCM_TRIGGER_STOP:
1590 stop_endpoints(subs, substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING);
1591 snd_usb_endpoint_set_callback(subs->data_endpoint,
1594 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
1595 subs->cur_audiofmt->iface,
1596 subs->cur_audiofmt->altsetting);
1598 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1599 /* keep retire_data_urb for delay calculation */
1600 snd_usb_endpoint_set_callback(subs->data_endpoint,
1602 retire_playback_urb,
1605 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
1606 subs->cur_audiofmt->iface,
1607 subs->cur_audiofmt->altsetting);
1614 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1618 struct snd_usb_substream *subs = substream->runtime->private_data;
1621 case SNDRV_PCM_TRIGGER_START:
1622 err = start_endpoints(subs);
1626 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1627 snd_usb_endpoint_set_callback(subs->data_endpoint,
1628 NULL, retire_capture_urb,
1630 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1632 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
1633 subs->cur_audiofmt->iface,
1634 subs->cur_audiofmt->altsetting);
1636 case SNDRV_PCM_TRIGGER_SUSPEND:
1637 case SNDRV_PCM_TRIGGER_STOP:
1638 stop_endpoints(subs, false);
1640 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1641 snd_usb_endpoint_set_callback(subs->data_endpoint,
1644 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
1645 subs->cur_audiofmt->iface,
1646 subs->cur_audiofmt->altsetting);
1653 static const struct snd_pcm_ops snd_usb_playback_ops = {
1654 .open = snd_usb_pcm_open,
1655 .close = snd_usb_pcm_close,
1656 .hw_params = snd_usb_hw_params,
1657 .hw_free = snd_usb_hw_free,
1658 .prepare = snd_usb_pcm_prepare,
1659 .trigger = snd_usb_substream_playback_trigger,
1660 .sync_stop = snd_usb_pcm_sync_stop,
1661 .pointer = snd_usb_pcm_pointer,
1662 .ack = snd_usb_pcm_playback_ack,
1665 static const struct snd_pcm_ops snd_usb_capture_ops = {
1666 .open = snd_usb_pcm_open,
1667 .close = snd_usb_pcm_close,
1668 .hw_params = snd_usb_hw_params,
1669 .hw_free = snd_usb_hw_free,
1670 .prepare = snd_usb_pcm_prepare,
1671 .trigger = snd_usb_substream_capture_trigger,
1672 .sync_stop = snd_usb_pcm_sync_stop,
1673 .pointer = snd_usb_pcm_pointer,
1676 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1678 const struct snd_pcm_ops *ops;
1680 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1681 &snd_usb_playback_ops : &snd_usb_capture_ops;
1682 snd_pcm_set_ops(pcm, stream, ops);
1685 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1687 struct snd_pcm *pcm = subs->stream->pcm;
1688 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1689 struct device *dev = subs->dev->bus->sysdev;
1691 if (snd_usb_use_vmalloc)
1692 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1695 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1696 dev, 64*1024, 512*1024);