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 */
326 case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
329 goto add_sync_ep_from_ifnum;
330 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
331 case USB_ID(0x0763, 0x2081):
334 goto add_sync_ep_from_ifnum;
335 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
336 case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
339 goto add_sync_ep_from_ifnum;
340 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
343 goto add_sync_ep_from_ifnum;
344 case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
347 goto add_sync_ep_from_ifnum;
348 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
349 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
352 goto add_sync_ep_from_ifnum;
353 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
355 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
361 goto add_sync_ep_from_ifnum;
362 case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
363 case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
364 case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
365 case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
366 case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
369 goto add_sync_ep_from_ifnum;
370 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
371 /* BOSS Katana amplifiers do not need quirks */
375 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
376 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
377 altsd->bInterfaceProtocol == 2 &&
378 altsd->bNumEndpoints == 1 &&
379 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
380 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
381 altsd->bAlternateSetting,
389 add_sync_ep_from_ifnum:
390 iface = usb_ifnum_to_if(dev, ifnum);
392 if (!iface || iface->num_altsetting < 2)
395 alts = &iface->altsetting[1];
398 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
399 alts, ep, !subs->direction,
400 SND_USB_ENDPOINT_TYPE_DATA);
401 if (!subs->sync_endpoint)
404 subs->sync_endpoint->is_implicit_feedback = 1;
406 subs->data_endpoint->sync_master = subs->sync_endpoint;
411 static int set_sync_endpoint(struct snd_usb_substream *subs,
412 struct audioformat *fmt,
413 struct usb_device *dev,
414 struct usb_host_interface *alts,
415 struct usb_interface_descriptor *altsd)
417 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
418 unsigned int ep, attr;
422 /* we need a sync pipe in async OUT or adaptive IN mode */
423 /* check the number of EP, since some devices have broken
424 * descriptors which fool us. if it has only one EP,
425 * assume it as adaptive-out or sync-in.
427 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
429 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
430 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
433 * In these modes the notion of sync_endpoint is irrelevant.
434 * Reset pointers to avoid using stale data from previously
435 * used settings, e.g. when configuration and endpoints were
439 subs->sync_endpoint = NULL;
440 subs->data_endpoint->sync_master = NULL;
443 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
447 /* endpoint set by quirk */
451 if (altsd->bNumEndpoints < 2)
454 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
455 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
456 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
460 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
461 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
462 * error fall back to SYNC mode and don't create sync endpoint
465 /* check sync-pipe endpoint */
466 /* ... and check descriptor size before accessing bSynchAddress
467 because there is a version of the SB Audigy 2 NX firmware lacking
468 the audio fields in the endpoint descriptors */
469 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
470 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
471 get_endpoint(alts, 1)->bSynchAddress != 0)) {
473 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
474 fmt->iface, fmt->altsetting,
475 get_endpoint(alts, 1)->bmAttributes,
476 get_endpoint(alts, 1)->bLength,
477 get_endpoint(alts, 1)->bSynchAddress);
478 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
482 ep = get_endpoint(alts, 1)->bEndpointAddress;
483 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
484 get_endpoint(alts, 0)->bSynchAddress != 0 &&
485 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
486 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
488 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
489 fmt->iface, fmt->altsetting,
490 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
491 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
496 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
497 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
499 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
500 alts, ep, !subs->direction,
502 SND_USB_ENDPOINT_TYPE_DATA :
503 SND_USB_ENDPOINT_TYPE_SYNC);
505 if (!subs->sync_endpoint) {
506 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
511 subs->sync_endpoint->is_implicit_feedback = implicit_fb;
513 subs->data_endpoint->sync_master = subs->sync_endpoint;
519 * find a matching format and set up the interface
521 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
523 struct usb_device *dev = subs->dev;
524 struct usb_host_interface *alts;
525 struct usb_interface_descriptor *altsd;
526 struct usb_interface *iface;
529 iface = usb_ifnum_to_if(dev, fmt->iface);
532 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
535 altsd = get_iface_desc(alts);
537 if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
540 /* close the old interface */
541 if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
542 if (!subs->stream->chip->keep_iface) {
543 err = usb_set_interface(subs->dev, subs->interface, 0);
546 "%d:%d: return to setting 0 failed (%d)\n",
547 fmt->iface, fmt->altsetting, err);
551 subs->interface = -1;
552 subs->altset_idx = 0;
555 if (subs->need_setup_fmt)
556 subs->need_setup_fmt = false;
559 if (iface->cur_altsetting != alts) {
560 err = snd_usb_select_mode_quirk(subs, fmt);
564 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
567 "%d:%d: usb_set_interface failed (%d)\n",
568 fmt->iface, fmt->altsetting, err);
571 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
572 fmt->iface, fmt->altsetting);
573 snd_usb_set_interface_quirk(dev);
576 subs->interface = fmt->iface;
577 subs->altset_idx = fmt->altset_idx;
578 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
579 alts, fmt->endpoint, subs->direction,
580 SND_USB_ENDPOINT_TYPE_DATA);
582 if (!subs->data_endpoint)
585 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
589 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
593 subs->cur_audiofmt = fmt;
595 snd_usb_set_format_quirk(subs, fmt);
601 * Return the score of matching two audioformats.
602 * Veto the audioformat if:
603 * - It has no channels for some reason.
604 * - Requested PCM format is not supported.
605 * - Requested sample rate is not supported.
607 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
608 struct audioformat *fp,
609 struct audioformat *match, int rate,
610 snd_pcm_format_t pcm_format)
615 if (fp->channels < 1) {
616 dev_dbg(&subs->dev->dev,
617 "%s: (fmt @%p) no channels\n", __func__, fp);
621 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
622 dev_dbg(&subs->dev->dev,
623 "%s: (fmt @%p) no match for format %d\n", __func__,
628 for (i = 0; i < fp->nr_rates; i++) {
629 if (fp->rate_table[i] == rate) {
635 dev_dbg(&subs->dev->dev,
636 "%s: (fmt @%p) no match for rate %d\n", __func__,
641 if (fp->channels == match->channels)
644 dev_dbg(&subs->dev->dev,
645 "%s: (fmt @%p) score %d\n", __func__, fp, score);
651 * Configure the sync ep using the rate and pcm format of the data ep.
653 static int configure_sync_endpoint(struct snd_usb_substream *subs)
656 struct audioformat *fp;
657 struct audioformat *sync_fp = NULL;
659 int sync_period_bytes = subs->period_bytes;
660 struct snd_usb_substream *sync_subs =
661 &subs->stream->substream[subs->direction ^ 1];
663 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
665 return snd_usb_endpoint_set_params(subs->sync_endpoint,
674 /* Try to find the best matching audioformat. */
675 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
676 int score = match_endpoint_audioformats(subs,
677 fp, subs->cur_audiofmt,
678 subs->cur_rate, subs->pcm_format);
680 if (score > cur_score) {
686 if (unlikely(sync_fp == NULL)) {
687 dev_err(&subs->dev->dev,
688 "%s: no valid audioformat for sync ep %x found\n",
689 __func__, sync_subs->ep_num);
694 * Recalculate the period bytes if channel number differ between
695 * data and sync ep audioformat.
697 if (sync_fp->channels != subs->channels) {
698 sync_period_bytes = (subs->period_bytes / subs->channels) *
700 dev_dbg(&subs->dev->dev,
701 "%s: adjusted sync ep period bytes (%d -> %d)\n",
702 __func__, subs->period_bytes, sync_period_bytes);
705 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
718 * configure endpoint params
720 * called during initial setup and upon resume
722 static int configure_endpoint(struct snd_usb_substream *subs)
727 stop_endpoints(subs, true);
728 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
733 subs->buffer_periods,
736 subs->sync_endpoint);
740 if (subs->sync_endpoint)
741 ret = configure_sync_endpoint(subs);
746 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
753 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
755 dev_err(&subs->dev->dev,
756 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
757 subs->str_pd->pd_id, state, ret);
764 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
768 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
772 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
779 int snd_usb_pcm_resume(struct snd_usb_stream *as)
783 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
787 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
797 * allocate a buffer and set the given audio format.
799 * so far we use a physically linear buffer although packetize transfer
800 * doesn't need a continuous area.
801 * if sg buffer is supported on the later version of alsa, we'll follow
804 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
805 struct snd_pcm_hw_params *hw_params)
807 struct snd_usb_substream *subs = substream->runtime->private_data;
808 struct audioformat *fmt;
811 ret = snd_media_start_pipeline(subs);
815 if (snd_usb_use_vmalloc)
816 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
817 params_buffer_bytes(hw_params));
819 ret = snd_pcm_lib_malloc_pages(substream,
820 params_buffer_bytes(hw_params));
824 subs->pcm_format = params_format(hw_params);
825 subs->period_bytes = params_period_bytes(hw_params);
826 subs->period_frames = params_period_size(hw_params);
827 subs->buffer_periods = params_periods(hw_params);
828 subs->channels = params_channels(hw_params);
829 subs->cur_rate = params_rate(hw_params);
831 fmt = find_format(subs);
833 dev_dbg(&subs->dev->dev,
834 "cannot set format: format = %#x, rate = %d, channels = %d\n",
835 subs->pcm_format, subs->cur_rate, subs->channels);
840 ret = snd_usb_lock_shutdown(subs->stream->chip);
844 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
848 ret = set_format(subs, fmt);
852 subs->interface = fmt->iface;
853 subs->altset_idx = fmt->altset_idx;
854 subs->need_setup_ep = true;
857 snd_usb_unlock_shutdown(subs->stream->chip);
863 snd_media_stop_pipeline(subs);
870 * reset the audio format and release the buffer
872 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
874 struct snd_usb_substream *subs = substream->runtime->private_data;
876 snd_media_stop_pipeline(subs);
877 subs->cur_audiofmt = NULL;
879 subs->period_bytes = 0;
880 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
881 stop_endpoints(subs, true);
882 snd_usb_endpoint_deactivate(subs->sync_endpoint);
883 snd_usb_endpoint_deactivate(subs->data_endpoint);
884 snd_usb_unlock_shutdown(subs->stream->chip);
887 if (snd_usb_use_vmalloc)
888 return snd_pcm_lib_free_vmalloc_buffer(substream);
890 return snd_pcm_lib_free_pages(substream);
896 * only a few subtle things...
898 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
900 struct snd_pcm_runtime *runtime = substream->runtime;
901 struct snd_usb_substream *subs = runtime->private_data;
902 struct usb_host_interface *alts;
903 struct usb_interface *iface;
906 if (! subs->cur_audiofmt) {
907 dev_err(&subs->dev->dev, "no format is specified!\n");
911 ret = snd_usb_lock_shutdown(subs->stream->chip);
914 if (snd_BUG_ON(!subs->data_endpoint)) {
919 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
920 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
922 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
926 ret = set_format(subs, subs->cur_audiofmt);
930 if (subs->need_setup_ep) {
932 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
933 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
934 ret = snd_usb_init_sample_rate(subs->stream->chip,
935 subs->cur_audiofmt->iface,
942 ret = configure_endpoint(subs);
945 subs->need_setup_ep = false;
948 /* some unit conversions in runtime */
949 subs->data_endpoint->maxframesize =
950 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
951 subs->data_endpoint->curframesize =
952 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
954 /* reset the pointer */
955 subs->hwptr_done = 0;
956 subs->transfer_done = 0;
957 subs->last_delay = 0;
958 subs->last_frame_number = 0;
961 /* for playback, submit the URBs now; otherwise, the first hwptr_done
962 * updates for all URBs would happen at the same time when starting */
963 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
964 ret = start_endpoints(subs);
967 snd_usb_unlock_shutdown(subs->stream->chip);
971 static const struct snd_pcm_hardware snd_usb_hardware =
973 .info = SNDRV_PCM_INFO_MMAP |
974 SNDRV_PCM_INFO_MMAP_VALID |
975 SNDRV_PCM_INFO_BATCH |
976 SNDRV_PCM_INFO_INTERLEAVED |
977 SNDRV_PCM_INFO_BLOCK_TRANSFER |
978 SNDRV_PCM_INFO_PAUSE,
979 .buffer_bytes_max = 1024 * 1024,
980 .period_bytes_min = 64,
981 .period_bytes_max = 512 * 1024,
986 static int hw_check_valid_format(struct snd_usb_substream *subs,
987 struct snd_pcm_hw_params *params,
988 struct audioformat *fp)
990 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
991 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
992 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
993 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
994 struct snd_mask check_fmts;
997 /* check the format */
998 snd_mask_none(&check_fmts);
999 check_fmts.bits[0] = (u32)fp->formats;
1000 check_fmts.bits[1] = (u32)(fp->formats >> 32);
1001 snd_mask_intersect(&check_fmts, fmts);
1002 if (snd_mask_empty(&check_fmts)) {
1003 hwc_debug(" > check: no supported format %d\n", fp->format);
1006 /* check the channels */
1007 if (fp->channels < ct->min || fp->channels > ct->max) {
1008 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1011 /* check the rate is within the range */
1012 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1013 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1016 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1017 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1020 /* check whether the period time is >= the data packet interval */
1021 if (subs->speed != USB_SPEED_FULL) {
1022 ptime = 125 * (1 << fp->datainterval);
1023 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1024 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1031 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1032 struct snd_pcm_hw_rule *rule)
1034 struct snd_usb_substream *subs = rule->private;
1035 struct audioformat *fp;
1036 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1037 unsigned int rmin, rmax;
1040 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1043 list_for_each_entry(fp, &subs->fmt_list, list) {
1044 if (!hw_check_valid_format(subs, params, fp))
1047 if (rmin > fp->rate_min)
1048 rmin = fp->rate_min;
1049 if (rmax < fp->rate_max)
1050 rmax = fp->rate_max;
1052 rmin = fp->rate_min;
1053 rmax = fp->rate_max;
1058 hwc_debug(" --> get empty\n");
1064 if (it->min < rmin) {
1069 if (it->max > rmax) {
1074 if (snd_interval_checkempty(it)) {
1078 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1083 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1084 struct snd_pcm_hw_rule *rule)
1086 struct snd_usb_substream *subs = rule->private;
1087 struct audioformat *fp;
1088 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1089 unsigned int rmin, rmax;
1092 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1095 list_for_each_entry(fp, &subs->fmt_list, list) {
1096 if (!hw_check_valid_format(subs, params, fp))
1099 if (rmin > fp->channels)
1100 rmin = fp->channels;
1101 if (rmax < fp->channels)
1102 rmax = fp->channels;
1104 rmin = fp->channels;
1105 rmax = fp->channels;
1110 hwc_debug(" --> get empty\n");
1116 if (it->min < rmin) {
1121 if (it->max > rmax) {
1126 if (snd_interval_checkempty(it)) {
1130 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1134 static int hw_rule_format(struct snd_pcm_hw_params *params,
1135 struct snd_pcm_hw_rule *rule)
1137 struct snd_usb_substream *subs = rule->private;
1138 struct audioformat *fp;
1139 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1144 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1146 list_for_each_entry(fp, &subs->fmt_list, list) {
1147 if (!hw_check_valid_format(subs, params, fp))
1149 fbits |= fp->formats;
1152 oldbits[0] = fmt->bits[0];
1153 oldbits[1] = fmt->bits[1];
1154 fmt->bits[0] &= (u32)fbits;
1155 fmt->bits[1] &= (u32)(fbits >> 32);
1156 if (!fmt->bits[0] && !fmt->bits[1]) {
1157 hwc_debug(" --> get empty\n");
1160 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1161 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1165 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1166 struct snd_pcm_hw_rule *rule)
1168 struct snd_usb_substream *subs = rule->private;
1169 struct audioformat *fp;
1170 struct snd_interval *it;
1171 unsigned char min_datainterval;
1175 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1176 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1177 min_datainterval = 0xff;
1178 list_for_each_entry(fp, &subs->fmt_list, list) {
1179 if (!hw_check_valid_format(subs, params, fp))
1181 min_datainterval = min(min_datainterval, fp->datainterval);
1183 if (min_datainterval == 0xff) {
1184 hwc_debug(" --> get empty\n");
1188 pmin = 125 * (1 << min_datainterval);
1190 if (it->min < pmin) {
1195 if (snd_interval_checkempty(it)) {
1199 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1204 * If the device supports unusual bit rates, does the request meet these?
1206 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1207 struct snd_usb_substream *subs)
1209 struct audioformat *fp;
1211 int count = 0, needs_knot = 0;
1214 kfree(subs->rate_list.list);
1215 subs->rate_list.list = NULL;
1217 list_for_each_entry(fp, &subs->fmt_list, list) {
1218 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1220 count += fp->nr_rates;
1221 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1227 subs->rate_list.list = rate_list =
1228 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1229 if (!subs->rate_list.list)
1231 subs->rate_list.count = count;
1232 subs->rate_list.mask = 0;
1234 list_for_each_entry(fp, &subs->fmt_list, list) {
1236 for (i = 0; i < fp->nr_rates; i++)
1237 rate_list[count++] = fp->rate_table[i];
1239 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1249 * set up the runtime hardware information.
1252 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1254 struct audioformat *fp;
1255 unsigned int pt, ptmin;
1256 int param_period_time_if_needed;
1259 runtime->hw.formats = subs->formats;
1261 runtime->hw.rate_min = 0x7fffffff;
1262 runtime->hw.rate_max = 0;
1263 runtime->hw.channels_min = 256;
1264 runtime->hw.channels_max = 0;
1265 runtime->hw.rates = 0;
1267 /* check min/max rates and channels */
1268 list_for_each_entry(fp, &subs->fmt_list, list) {
1269 runtime->hw.rates |= fp->rates;
1270 if (runtime->hw.rate_min > fp->rate_min)
1271 runtime->hw.rate_min = fp->rate_min;
1272 if (runtime->hw.rate_max < fp->rate_max)
1273 runtime->hw.rate_max = fp->rate_max;
1274 if (runtime->hw.channels_min > fp->channels)
1275 runtime->hw.channels_min = fp->channels;
1276 if (runtime->hw.channels_max < fp->channels)
1277 runtime->hw.channels_max = fp->channels;
1278 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1279 /* FIXME: there might be more than one audio formats... */
1280 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1283 pt = 125 * (1 << fp->datainterval);
1284 ptmin = min(ptmin, pt);
1287 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1288 if (subs->speed == USB_SPEED_FULL)
1289 /* full speed devices have fixed data packet interval */
1292 /* if period time doesn't go below 1 ms, no rules needed */
1293 param_period_time_if_needed = -1;
1295 err = snd_pcm_hw_constraint_minmax(runtime,
1296 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1301 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1303 SNDRV_PCM_HW_PARAM_FORMAT,
1304 SNDRV_PCM_HW_PARAM_CHANNELS,
1305 param_period_time_if_needed,
1309 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1310 hw_rule_channels, subs,
1311 SNDRV_PCM_HW_PARAM_FORMAT,
1312 SNDRV_PCM_HW_PARAM_RATE,
1313 param_period_time_if_needed,
1317 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1318 hw_rule_format, subs,
1319 SNDRV_PCM_HW_PARAM_RATE,
1320 SNDRV_PCM_HW_PARAM_CHANNELS,
1321 param_period_time_if_needed,
1325 if (param_period_time_if_needed >= 0) {
1326 err = snd_pcm_hw_rule_add(runtime, 0,
1327 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1328 hw_rule_period_time, subs,
1329 SNDRV_PCM_HW_PARAM_FORMAT,
1330 SNDRV_PCM_HW_PARAM_CHANNELS,
1331 SNDRV_PCM_HW_PARAM_RATE,
1336 err = snd_usb_pcm_check_knot(runtime, subs);
1340 return snd_usb_autoresume(subs->stream->chip);
1343 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1345 int direction = substream->stream;
1346 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1347 struct snd_pcm_runtime *runtime = substream->runtime;
1348 struct snd_usb_substream *subs = &as->substream[direction];
1351 subs->interface = -1;
1352 subs->altset_idx = 0;
1353 runtime->hw = snd_usb_hardware;
1354 runtime->private_data = subs;
1355 subs->pcm_substream = substream;
1356 /* runtime PM is also done there */
1358 /* initialize DSD/DOP context */
1359 subs->dsd_dop.byte_idx = 0;
1360 subs->dsd_dop.channel = 0;
1361 subs->dsd_dop.marker = 1;
1363 ret = setup_hw_info(runtime, subs);
1365 ret = snd_media_stream_init(subs, as->pcm, direction);
1367 snd_usb_autosuspend(subs->stream->chip);
1372 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1374 int direction = substream->stream;
1375 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1376 struct snd_usb_substream *subs = &as->substream[direction];
1379 stop_endpoints(subs, true);
1380 snd_media_stop_pipeline(subs);
1382 if (!as->chip->keep_iface &&
1383 subs->interface >= 0 &&
1384 !snd_usb_lock_shutdown(subs->stream->chip)) {
1385 usb_set_interface(subs->dev, subs->interface, 0);
1386 subs->interface = -1;
1387 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1388 snd_usb_unlock_shutdown(subs->stream->chip);
1393 subs->pcm_substream = NULL;
1394 snd_usb_autosuspend(subs->stream->chip);
1399 /* Since a URB can handle only a single linear buffer, we must use double
1400 * buffering when the data to be transferred overflows the buffer boundary.
1401 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1404 static void retire_capture_urb(struct snd_usb_substream *subs,
1407 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1408 unsigned int stride, frames, bytes, oldptr;
1409 int i, period_elapsed = 0;
1410 unsigned long flags;
1412 int current_frame_number;
1414 /* read frame number here, update pointer in critical section */
1415 current_frame_number = usb_get_current_frame_number(subs->dev);
1417 stride = runtime->frame_bits >> 3;
1419 for (i = 0; i < urb->number_of_packets; i++) {
1420 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1421 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1422 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1423 i, urb->iso_frame_desc[i].status);
1426 bytes = urb->iso_frame_desc[i].actual_length;
1427 if (subs->stream_offset_adj > 0) {
1428 unsigned int adj = min(subs->stream_offset_adj, bytes);
1431 subs->stream_offset_adj -= adj;
1433 frames = bytes / stride;
1434 if (!subs->txfr_quirk)
1435 bytes = frames * stride;
1436 if (bytes % (runtime->sample_bits >> 3) != 0) {
1437 int oldbytes = bytes;
1438 bytes = frames * stride;
1439 dev_warn_ratelimited(&subs->dev->dev,
1440 "Corrected urb data len. %d->%d\n",
1443 /* update the current pointer */
1444 spin_lock_irqsave(&subs->lock, flags);
1445 oldptr = subs->hwptr_done;
1446 subs->hwptr_done += bytes;
1447 if (subs->hwptr_done >= runtime->buffer_size * stride)
1448 subs->hwptr_done -= runtime->buffer_size * stride;
1449 frames = (bytes + (oldptr % stride)) / stride;
1450 subs->transfer_done += frames;
1451 if (subs->transfer_done >= runtime->period_size) {
1452 subs->transfer_done -= runtime->period_size;
1455 /* capture delay is by construction limited to one URB,
1458 runtime->delay = subs->last_delay = 0;
1460 /* realign last_frame_number */
1461 subs->last_frame_number = current_frame_number;
1462 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1464 spin_unlock_irqrestore(&subs->lock, flags);
1465 /* copy a data chunk */
1466 if (oldptr + bytes > runtime->buffer_size * stride) {
1467 unsigned int bytes1 =
1468 runtime->buffer_size * stride - oldptr;
1469 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1470 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1472 memcpy(runtime->dma_area + oldptr, cp, bytes);
1477 snd_pcm_period_elapsed(subs->pcm_substream);
1480 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1481 struct urb *urb, unsigned int bytes)
1483 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1484 unsigned int stride = runtime->frame_bits >> 3;
1485 unsigned int dst_idx = 0;
1486 unsigned int src_idx = subs->hwptr_done;
1487 unsigned int wrap = runtime->buffer_size * stride;
1488 u8 *dst = urb->transfer_buffer;
1489 u8 *src = runtime->dma_area;
1490 u8 marker[] = { 0x05, 0xfa };
1493 * The DSP DOP format defines a way to transport DSD samples over
1494 * normal PCM data endpoints. It requires stuffing of marker bytes
1495 * (0x05 and 0xfa, alternating per sample frame), and then expects
1496 * 2 additional bytes of actual payload. The whole frame is stored
1499 * Hence, for a stereo transport, the buffer layout looks like this,
1500 * where L refers to left channel samples and R to right.
1502 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1503 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1509 if (++subs->dsd_dop.byte_idx == 3) {
1510 /* frame boundary? */
1511 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1513 subs->dsd_dop.byte_idx = 0;
1515 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1516 /* alternate the marker */
1517 subs->dsd_dop.marker++;
1518 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1519 subs->dsd_dop.channel = 0;
1522 /* stuff the DSD payload */
1523 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1525 if (subs->cur_audiofmt->dsd_bitrev)
1526 dst[dst_idx++] = bitrev8(src[idx]);
1528 dst[dst_idx++] = src[idx];
1533 if (subs->hwptr_done >= runtime->buffer_size * stride)
1534 subs->hwptr_done -= runtime->buffer_size * stride;
1537 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1538 int offset, int stride, unsigned int bytes)
1540 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1542 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1543 /* err, the transferred area goes over buffer boundary. */
1544 unsigned int bytes1 =
1545 runtime->buffer_size * stride - subs->hwptr_done;
1546 memcpy(urb->transfer_buffer + offset,
1547 runtime->dma_area + subs->hwptr_done, bytes1);
1548 memcpy(urb->transfer_buffer + offset + bytes1,
1549 runtime->dma_area, bytes - bytes1);
1551 memcpy(urb->transfer_buffer + offset,
1552 runtime->dma_area + subs->hwptr_done, bytes);
1554 subs->hwptr_done += bytes;
1555 if (subs->hwptr_done >= runtime->buffer_size * stride)
1556 subs->hwptr_done -= runtime->buffer_size * stride;
1559 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1560 struct urb *urb, int stride,
1563 __le32 packet_length;
1566 /* Put __le32 length descriptor at start of each packet. */
1567 for (i = 0; i < urb->number_of_packets; i++) {
1568 unsigned int length = urb->iso_frame_desc[i].length;
1569 unsigned int offset = urb->iso_frame_desc[i].offset;
1571 packet_length = cpu_to_le32(length);
1572 offset += i * sizeof(packet_length);
1573 urb->iso_frame_desc[i].offset = offset;
1574 urb->iso_frame_desc[i].length += sizeof(packet_length);
1575 memcpy(urb->transfer_buffer + offset,
1576 &packet_length, sizeof(packet_length));
1577 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1580 /* Adjust transfer size accordingly. */
1581 bytes += urb->number_of_packets * sizeof(packet_length);
1585 static void prepare_playback_urb(struct snd_usb_substream *subs,
1588 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1589 struct snd_usb_endpoint *ep = subs->data_endpoint;
1590 struct snd_urb_ctx *ctx = urb->context;
1591 unsigned int counts, frames, bytes;
1592 int i, stride, period_elapsed = 0;
1593 unsigned long flags;
1595 stride = runtime->frame_bits >> 3;
1598 urb->number_of_packets = 0;
1599 spin_lock_irqsave(&subs->lock, flags);
1600 subs->frame_limit += ep->max_urb_frames;
1601 for (i = 0; i < ctx->packets; i++) {
1602 if (ctx->packet_size[i])
1603 counts = ctx->packet_size[i];
1605 counts = snd_usb_endpoint_next_packet_size(ep);
1607 /* set up descriptor */
1608 urb->iso_frame_desc[i].offset = frames * ep->stride;
1609 urb->iso_frame_desc[i].length = counts * ep->stride;
1611 urb->number_of_packets++;
1612 subs->transfer_done += counts;
1613 if (subs->transfer_done >= runtime->period_size) {
1614 subs->transfer_done -= runtime->period_size;
1615 subs->frame_limit = 0;
1617 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1618 if (subs->transfer_done > 0) {
1619 /* FIXME: fill-max mode is not
1621 frames -= subs->transfer_done;
1622 counts -= subs->transfer_done;
1623 urb->iso_frame_desc[i].length =
1624 counts * ep->stride;
1625 subs->transfer_done = 0;
1628 if (i < ctx->packets) {
1629 /* add a transfer delimiter */
1630 urb->iso_frame_desc[i].offset =
1631 frames * ep->stride;
1632 urb->iso_frame_desc[i].length = 0;
1633 urb->number_of_packets++;
1638 /* finish at the period boundary or after enough frames */
1639 if ((period_elapsed ||
1640 subs->transfer_done >= subs->frame_limit) &&
1641 !snd_usb_endpoint_implicit_feedback_sink(ep))
1644 bytes = frames * ep->stride;
1646 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1647 subs->cur_audiofmt->dsd_dop)) {
1648 fill_playback_urb_dsd_dop(subs, urb, bytes);
1649 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1650 subs->cur_audiofmt->dsd_bitrev)) {
1651 /* bit-reverse the bytes */
1652 u8 *buf = urb->transfer_buffer;
1653 for (i = 0; i < bytes; i++) {
1654 int idx = (subs->hwptr_done + i)
1655 % (runtime->buffer_size * stride);
1656 buf[i] = bitrev8(runtime->dma_area[idx]);
1659 subs->hwptr_done += bytes;
1660 if (subs->hwptr_done >= runtime->buffer_size * stride)
1661 subs->hwptr_done -= runtime->buffer_size * stride;
1664 if (!subs->tx_length_quirk)
1665 copy_to_urb(subs, urb, 0, stride, bytes);
1667 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1668 /* bytes is now amount of outgoing data */
1671 /* update delay with exact number of samples queued */
1672 runtime->delay = subs->last_delay;
1673 runtime->delay += frames;
1674 subs->last_delay = runtime->delay;
1676 /* realign last_frame_number */
1677 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1678 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1680 if (subs->trigger_tstamp_pending_update) {
1681 /* this is the first actual URB submitted,
1682 * update trigger timestamp to reflect actual start time
1684 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1685 subs->trigger_tstamp_pending_update = false;
1688 spin_unlock_irqrestore(&subs->lock, flags);
1689 urb->transfer_buffer_length = bytes;
1691 snd_pcm_period_elapsed(subs->pcm_substream);
1695 * process after playback data complete
1696 * - decrease the delay count again
1698 static void retire_playback_urb(struct snd_usb_substream *subs,
1701 unsigned long flags;
1702 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1703 struct snd_usb_endpoint *ep = subs->data_endpoint;
1704 int processed = urb->transfer_buffer_length / ep->stride;
1707 /* ignore the delay accounting when procssed=0 is given, i.e.
1708 * silent payloads are procssed before handling the actual data
1713 spin_lock_irqsave(&subs->lock, flags);
1714 if (!subs->last_delay)
1715 goto out; /* short path */
1717 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1718 /* update delay with exact number of samples played */
1719 if (processed > subs->last_delay)
1720 subs->last_delay = 0;
1722 subs->last_delay -= processed;
1723 runtime->delay = subs->last_delay;
1726 * Report when delay estimate is off by more than 2ms.
1727 * The error should be lower than 2ms since the estimate relies
1728 * on two reads of a counter updated every ms.
1730 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1731 dev_dbg_ratelimited(&subs->dev->dev,
1732 "delay: estimated %d, actual %d\n",
1733 est_delay, subs->last_delay);
1735 if (!subs->running) {
1736 /* update last_frame_number for delay counting here since
1737 * prepare_playback_urb won't be called during pause
1739 subs->last_frame_number =
1740 usb_get_current_frame_number(subs->dev) & 0xff;
1744 spin_unlock_irqrestore(&subs->lock, flags);
1747 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1750 struct snd_usb_substream *subs = substream->runtime->private_data;
1753 case SNDRV_PCM_TRIGGER_START:
1754 subs->trigger_tstamp_pending_update = true;
1756 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1757 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1758 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1761 case SNDRV_PCM_TRIGGER_STOP:
1762 stop_endpoints(subs, false);
1765 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1766 subs->data_endpoint->prepare_data_urb = NULL;
1767 /* keep retire_data_urb for delay calculation */
1768 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1771 case SNDRV_PCM_TRIGGER_SUSPEND:
1772 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1773 stop_endpoints(subs, true);
1774 subs->need_setup_fmt = true;
1783 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1787 struct snd_usb_substream *subs = substream->runtime->private_data;
1790 case SNDRV_PCM_TRIGGER_START:
1791 err = start_endpoints(subs);
1795 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1798 case SNDRV_PCM_TRIGGER_STOP:
1799 stop_endpoints(subs, false);
1800 subs->data_endpoint->retire_data_urb = NULL;
1803 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1804 subs->data_endpoint->retire_data_urb = NULL;
1807 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1808 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1811 case SNDRV_PCM_TRIGGER_SUSPEND:
1812 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1813 stop_endpoints(subs, true);
1814 subs->need_setup_fmt = true;
1823 static const struct snd_pcm_ops snd_usb_playback_ops = {
1824 .open = snd_usb_pcm_open,
1825 .close = snd_usb_pcm_close,
1826 .ioctl = snd_pcm_lib_ioctl,
1827 .hw_params = snd_usb_hw_params,
1828 .hw_free = snd_usb_hw_free,
1829 .prepare = snd_usb_pcm_prepare,
1830 .trigger = snd_usb_substream_playback_trigger,
1831 .pointer = snd_usb_pcm_pointer,
1832 .page = snd_pcm_lib_get_vmalloc_page,
1835 static const struct snd_pcm_ops snd_usb_capture_ops = {
1836 .open = snd_usb_pcm_open,
1837 .close = snd_usb_pcm_close,
1838 .ioctl = snd_pcm_lib_ioctl,
1839 .hw_params = snd_usb_hw_params,
1840 .hw_free = snd_usb_hw_free,
1841 .prepare = snd_usb_pcm_prepare,
1842 .trigger = snd_usb_substream_capture_trigger,
1843 .pointer = snd_usb_pcm_pointer,
1844 .page = snd_pcm_lib_get_vmalloc_page,
1847 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1848 .open = snd_usb_pcm_open,
1849 .close = snd_usb_pcm_close,
1850 .ioctl = snd_pcm_lib_ioctl,
1851 .hw_params = snd_usb_hw_params,
1852 .hw_free = snd_usb_hw_free,
1853 .prepare = snd_usb_pcm_prepare,
1854 .trigger = snd_usb_substream_playback_trigger,
1855 .pointer = snd_usb_pcm_pointer,
1856 .page = snd_pcm_sgbuf_ops_page,
1859 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1860 .open = snd_usb_pcm_open,
1861 .close = snd_usb_pcm_close,
1862 .ioctl = snd_pcm_lib_ioctl,
1863 .hw_params = snd_usb_hw_params,
1864 .hw_free = snd_usb_hw_free,
1865 .prepare = snd_usb_pcm_prepare,
1866 .trigger = snd_usb_substream_capture_trigger,
1867 .pointer = snd_usb_pcm_pointer,
1868 .page = snd_pcm_sgbuf_ops_page,
1871 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1873 const struct snd_pcm_ops *ops;
1875 if (snd_usb_use_vmalloc)
1876 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1877 &snd_usb_playback_ops : &snd_usb_capture_ops;
1879 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1880 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1881 snd_pcm_set_ops(pcm, stream, ops);
1884 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1886 struct snd_pcm *pcm = subs->stream->pcm;
1887 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1888 struct device *dev = subs->dev->bus->sysdev;
1890 if (!snd_usb_use_vmalloc)
1891 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1892 dev, 64*1024, 512*1024);