xref: /openbmc/linux/sound/usb/quirks.c (revision e72e8bf1)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  */
4 
5 #include <linux/init.h>
6 #include <linux/slab.h>
7 #include <linux/usb.h>
8 #include <linux/usb/audio.h>
9 #include <linux/usb/midi.h>
10 #include <linux/bits.h>
11 
12 #include <sound/control.h>
13 #include <sound/core.h>
14 #include <sound/info.h>
15 #include <sound/pcm.h>
16 
17 #include "usbaudio.h"
18 #include "card.h"
19 #include "mixer.h"
20 #include "mixer_quirks.h"
21 #include "midi.h"
22 #include "quirks.h"
23 #include "helper.h"
24 #include "endpoint.h"
25 #include "pcm.h"
26 #include "clock.h"
27 #include "stream.h"
28 
29 /*
30  * handle the quirks for the contained interfaces
31  */
32 static int create_composite_quirk(struct snd_usb_audio *chip,
33 				  struct usb_interface *iface,
34 				  struct usb_driver *driver,
35 				  const struct snd_usb_audio_quirk *quirk_comp)
36 {
37 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
38 	const struct snd_usb_audio_quirk *quirk;
39 	int err;
40 
41 	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
42 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
43 		if (!iface)
44 			continue;
45 		if (quirk->ifnum != probed_ifnum &&
46 		    usb_interface_claimed(iface))
47 			continue;
48 		err = snd_usb_create_quirk(chip, iface, driver, quirk);
49 		if (err < 0)
50 			return err;
51 	}
52 
53 	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
54 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
55 		if (!iface)
56 			continue;
57 		if (quirk->ifnum != probed_ifnum &&
58 		    !usb_interface_claimed(iface))
59 			usb_driver_claim_interface(driver, iface, (void *)-1L);
60 	}
61 
62 	return 0;
63 }
64 
65 static int ignore_interface_quirk(struct snd_usb_audio *chip,
66 				  struct usb_interface *iface,
67 				  struct usb_driver *driver,
68 				  const struct snd_usb_audio_quirk *quirk)
69 {
70 	return 0;
71 }
72 
73 
74 /*
75  * Allow alignment on audio sub-slot (channel samples) rather than
76  * on audio slots (audio frames)
77  */
78 static int create_align_transfer_quirk(struct snd_usb_audio *chip,
79 				       struct usb_interface *iface,
80 				       struct usb_driver *driver,
81 				       const struct snd_usb_audio_quirk *quirk)
82 {
83 	chip->txfr_quirk = 1;
84 	return 1;	/* Continue with creating streams and mixer */
85 }
86 
87 static int create_any_midi_quirk(struct snd_usb_audio *chip,
88 				 struct usb_interface *intf,
89 				 struct usb_driver *driver,
90 				 const struct snd_usb_audio_quirk *quirk)
91 {
92 	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
93 }
94 
95 /*
96  * create a stream for an interface with proper descriptors
97  */
98 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
99 				       struct usb_interface *iface,
100 				       struct usb_driver *driver,
101 				       const struct snd_usb_audio_quirk *quirk)
102 {
103 	struct usb_host_interface *alts;
104 	struct usb_interface_descriptor *altsd;
105 	int err;
106 
107 	if (chip->usb_id == USB_ID(0x1686, 0x00dd)) /* Zoom R16/24 */
108 		chip->tx_length_quirk = 1;
109 
110 	alts = &iface->altsetting[0];
111 	altsd = get_iface_desc(alts);
112 	err = snd_usb_parse_audio_interface(chip, altsd->bInterfaceNumber);
113 	if (err < 0) {
114 		usb_audio_err(chip, "cannot setup if %d: error %d\n",
115 			   altsd->bInterfaceNumber, err);
116 		return err;
117 	}
118 	/* reset the current interface */
119 	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
120 	return 0;
121 }
122 
123 /*
124  * create a stream for an endpoint/altsetting without proper descriptors
125  */
126 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
127 				     struct usb_interface *iface,
128 				     struct usb_driver *driver,
129 				     const struct snd_usb_audio_quirk *quirk)
130 {
131 	struct audioformat *fp;
132 	struct usb_host_interface *alts;
133 	struct usb_interface_descriptor *altsd;
134 	int stream, err;
135 	unsigned *rate_table = NULL;
136 
137 	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
138 	if (!fp)
139 		return -ENOMEM;
140 
141 	INIT_LIST_HEAD(&fp->list);
142 	if (fp->nr_rates > MAX_NR_RATES) {
143 		kfree(fp);
144 		return -EINVAL;
145 	}
146 	if (fp->nr_rates > 0) {
147 		rate_table = kmemdup(fp->rate_table,
148 				     sizeof(int) * fp->nr_rates, GFP_KERNEL);
149 		if (!rate_table) {
150 			kfree(fp);
151 			return -ENOMEM;
152 		}
153 		fp->rate_table = rate_table;
154 	}
155 
156 	stream = (fp->endpoint & USB_DIR_IN)
157 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
158 	err = snd_usb_add_audio_stream(chip, stream, fp);
159 	if (err < 0)
160 		goto error;
161 	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
162 	    fp->altset_idx >= iface->num_altsetting) {
163 		err = -EINVAL;
164 		goto error;
165 	}
166 	alts = &iface->altsetting[fp->altset_idx];
167 	altsd = get_iface_desc(alts);
168 	if (altsd->bNumEndpoints < 1) {
169 		err = -EINVAL;
170 		goto error;
171 	}
172 
173 	fp->protocol = altsd->bInterfaceProtocol;
174 
175 	if (fp->datainterval == 0)
176 		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
177 	if (fp->maxpacksize == 0)
178 		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
179 	usb_set_interface(chip->dev, fp->iface, 0);
180 	snd_usb_init_pitch(chip, fp->iface, alts, fp);
181 	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
182 	return 0;
183 
184  error:
185 	list_del(&fp->list); /* unlink for avoiding double-free */
186 	kfree(fp);
187 	kfree(rate_table);
188 	return err;
189 }
190 
191 static int create_auto_pcm_quirk(struct snd_usb_audio *chip,
192 				 struct usb_interface *iface,
193 				 struct usb_driver *driver)
194 {
195 	struct usb_host_interface *alts;
196 	struct usb_interface_descriptor *altsd;
197 	struct usb_endpoint_descriptor *epd;
198 	struct uac1_as_header_descriptor *ashd;
199 	struct uac_format_type_i_discrete_descriptor *fmtd;
200 
201 	/*
202 	 * Most Roland/Yamaha audio streaming interfaces have more or less
203 	 * standard descriptors, but older devices might lack descriptors, and
204 	 * future ones might change, so ensure that we fail silently if the
205 	 * interface doesn't look exactly right.
206 	 */
207 
208 	/* must have a non-zero altsetting for streaming */
209 	if (iface->num_altsetting < 2)
210 		return -ENODEV;
211 	alts = &iface->altsetting[1];
212 	altsd = get_iface_desc(alts);
213 
214 	/* must have an isochronous endpoint for streaming */
215 	if (altsd->bNumEndpoints < 1)
216 		return -ENODEV;
217 	epd = get_endpoint(alts, 0);
218 	if (!usb_endpoint_xfer_isoc(epd))
219 		return -ENODEV;
220 
221 	/* must have format descriptors */
222 	ashd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
223 				       UAC_AS_GENERAL);
224 	fmtd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
225 				       UAC_FORMAT_TYPE);
226 	if (!ashd || ashd->bLength < 7 ||
227 	    !fmtd || fmtd->bLength < 8)
228 		return -ENODEV;
229 
230 	return create_standard_audio_quirk(chip, iface, driver, NULL);
231 }
232 
233 static int create_yamaha_midi_quirk(struct snd_usb_audio *chip,
234 				    struct usb_interface *iface,
235 				    struct usb_driver *driver,
236 				    struct usb_host_interface *alts)
237 {
238 	static const struct snd_usb_audio_quirk yamaha_midi_quirk = {
239 		.type = QUIRK_MIDI_YAMAHA
240 	};
241 	struct usb_midi_in_jack_descriptor *injd;
242 	struct usb_midi_out_jack_descriptor *outjd;
243 
244 	/* must have some valid jack descriptors */
245 	injd = snd_usb_find_csint_desc(alts->extra, alts->extralen,
246 				       NULL, USB_MS_MIDI_IN_JACK);
247 	outjd = snd_usb_find_csint_desc(alts->extra, alts->extralen,
248 					NULL, USB_MS_MIDI_OUT_JACK);
249 	if (!injd && !outjd)
250 		return -ENODEV;
251 	if ((injd && !snd_usb_validate_midi_desc(injd)) ||
252 	    (outjd && !snd_usb_validate_midi_desc(outjd)))
253 		return -ENODEV;
254 	if (injd && (injd->bLength < 5 ||
255 		     (injd->bJackType != USB_MS_EMBEDDED &&
256 		      injd->bJackType != USB_MS_EXTERNAL)))
257 		return -ENODEV;
258 	if (outjd && (outjd->bLength < 6 ||
259 		      (outjd->bJackType != USB_MS_EMBEDDED &&
260 		       outjd->bJackType != USB_MS_EXTERNAL)))
261 		return -ENODEV;
262 	return create_any_midi_quirk(chip, iface, driver, &yamaha_midi_quirk);
263 }
264 
265 static int create_roland_midi_quirk(struct snd_usb_audio *chip,
266 				    struct usb_interface *iface,
267 				    struct usb_driver *driver,
268 				    struct usb_host_interface *alts)
269 {
270 	static const struct snd_usb_audio_quirk roland_midi_quirk = {
271 		.type = QUIRK_MIDI_ROLAND
272 	};
273 	u8 *roland_desc = NULL;
274 
275 	/* might have a vendor-specific descriptor <06 24 F1 02 ...> */
276 	for (;;) {
277 		roland_desc = snd_usb_find_csint_desc(alts->extra,
278 						      alts->extralen,
279 						      roland_desc, 0xf1);
280 		if (!roland_desc)
281 			return -ENODEV;
282 		if (roland_desc[0] < 6 || roland_desc[3] != 2)
283 			continue;
284 		return create_any_midi_quirk(chip, iface, driver,
285 					     &roland_midi_quirk);
286 	}
287 }
288 
289 static int create_std_midi_quirk(struct snd_usb_audio *chip,
290 				 struct usb_interface *iface,
291 				 struct usb_driver *driver,
292 				 struct usb_host_interface *alts)
293 {
294 	struct usb_ms_header_descriptor *mshd;
295 	struct usb_ms_endpoint_descriptor *msepd;
296 
297 	/* must have the MIDIStreaming interface header descriptor*/
298 	mshd = (struct usb_ms_header_descriptor *)alts->extra;
299 	if (alts->extralen < 7 ||
300 	    mshd->bLength < 7 ||
301 	    mshd->bDescriptorType != USB_DT_CS_INTERFACE ||
302 	    mshd->bDescriptorSubtype != USB_MS_HEADER)
303 		return -ENODEV;
304 	/* must have the MIDIStreaming endpoint descriptor*/
305 	msepd = (struct usb_ms_endpoint_descriptor *)alts->endpoint[0].extra;
306 	if (alts->endpoint[0].extralen < 4 ||
307 	    msepd->bLength < 4 ||
308 	    msepd->bDescriptorType != USB_DT_CS_ENDPOINT ||
309 	    msepd->bDescriptorSubtype != UAC_MS_GENERAL ||
310 	    msepd->bNumEmbMIDIJack < 1 ||
311 	    msepd->bNumEmbMIDIJack > 16)
312 		return -ENODEV;
313 
314 	return create_any_midi_quirk(chip, iface, driver, NULL);
315 }
316 
317 static int create_auto_midi_quirk(struct snd_usb_audio *chip,
318 				  struct usb_interface *iface,
319 				  struct usb_driver *driver)
320 {
321 	struct usb_host_interface *alts;
322 	struct usb_interface_descriptor *altsd;
323 	struct usb_endpoint_descriptor *epd;
324 	int err;
325 
326 	alts = &iface->altsetting[0];
327 	altsd = get_iface_desc(alts);
328 
329 	/* must have at least one bulk/interrupt endpoint for streaming */
330 	if (altsd->bNumEndpoints < 1)
331 		return -ENODEV;
332 	epd = get_endpoint(alts, 0);
333 	if (!usb_endpoint_xfer_bulk(epd) &&
334 	    !usb_endpoint_xfer_int(epd))
335 		return -ENODEV;
336 
337 	switch (USB_ID_VENDOR(chip->usb_id)) {
338 	case 0x0499: /* Yamaha */
339 		err = create_yamaha_midi_quirk(chip, iface, driver, alts);
340 		if (err != -ENODEV)
341 			return err;
342 		break;
343 	case 0x0582: /* Roland */
344 		err = create_roland_midi_quirk(chip, iface, driver, alts);
345 		if (err != -ENODEV)
346 			return err;
347 		break;
348 	}
349 
350 	return create_std_midi_quirk(chip, iface, driver, alts);
351 }
352 
353 static int create_autodetect_quirk(struct snd_usb_audio *chip,
354 				   struct usb_interface *iface,
355 				   struct usb_driver *driver)
356 {
357 	int err;
358 
359 	err = create_auto_pcm_quirk(chip, iface, driver);
360 	if (err == -ENODEV)
361 		err = create_auto_midi_quirk(chip, iface, driver);
362 	return err;
363 }
364 
365 static int create_autodetect_quirks(struct snd_usb_audio *chip,
366 				    struct usb_interface *iface,
367 				    struct usb_driver *driver,
368 				    const struct snd_usb_audio_quirk *quirk)
369 {
370 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
371 	int ifcount, ifnum, err;
372 
373 	err = create_autodetect_quirk(chip, iface, driver);
374 	if (err < 0)
375 		return err;
376 
377 	/*
378 	 * ALSA PCM playback/capture devices cannot be registered in two steps,
379 	 * so we have to claim the other corresponding interface here.
380 	 */
381 	ifcount = chip->dev->actconfig->desc.bNumInterfaces;
382 	for (ifnum = 0; ifnum < ifcount; ifnum++) {
383 		if (ifnum == probed_ifnum || quirk->ifnum >= 0)
384 			continue;
385 		iface = usb_ifnum_to_if(chip->dev, ifnum);
386 		if (!iface ||
387 		    usb_interface_claimed(iface) ||
388 		    get_iface_desc(iface->altsetting)->bInterfaceClass !=
389 							USB_CLASS_VENDOR_SPEC)
390 			continue;
391 
392 		err = create_autodetect_quirk(chip, iface, driver);
393 		if (err >= 0)
394 			usb_driver_claim_interface(driver, iface, (void *)-1L);
395 	}
396 
397 	return 0;
398 }
399 
400 /*
401  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
402  * The only way to detect the sample rate is by looking at wMaxPacketSize.
403  */
404 static int create_uaxx_quirk(struct snd_usb_audio *chip,
405 			     struct usb_interface *iface,
406 			     struct usb_driver *driver,
407 			     const struct snd_usb_audio_quirk *quirk)
408 {
409 	static const struct audioformat ua_format = {
410 		.formats = SNDRV_PCM_FMTBIT_S24_3LE,
411 		.channels = 2,
412 		.fmt_type = UAC_FORMAT_TYPE_I,
413 		.altsetting = 1,
414 		.altset_idx = 1,
415 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
416 	};
417 	struct usb_host_interface *alts;
418 	struct usb_interface_descriptor *altsd;
419 	struct audioformat *fp;
420 	int stream, err;
421 
422 	/* both PCM and MIDI interfaces have 2 or more altsettings */
423 	if (iface->num_altsetting < 2)
424 		return -ENXIO;
425 	alts = &iface->altsetting[1];
426 	altsd = get_iface_desc(alts);
427 
428 	if (altsd->bNumEndpoints == 2) {
429 		static const struct snd_usb_midi_endpoint_info ua700_ep = {
430 			.out_cables = 0x0003,
431 			.in_cables  = 0x0003
432 		};
433 		static const struct snd_usb_audio_quirk ua700_quirk = {
434 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
435 			.data = &ua700_ep
436 		};
437 		static const struct snd_usb_midi_endpoint_info uaxx_ep = {
438 			.out_cables = 0x0001,
439 			.in_cables  = 0x0001
440 		};
441 		static const struct snd_usb_audio_quirk uaxx_quirk = {
442 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
443 			.data = &uaxx_ep
444 		};
445 		const struct snd_usb_audio_quirk *quirk =
446 			chip->usb_id == USB_ID(0x0582, 0x002b)
447 			? &ua700_quirk : &uaxx_quirk;
448 		return __snd_usbmidi_create(chip->card, iface,
449 					  &chip->midi_list, quirk,
450 					  chip->usb_id);
451 	}
452 
453 	if (altsd->bNumEndpoints != 1)
454 		return -ENXIO;
455 
456 	fp = kmemdup(&ua_format, sizeof(*fp), GFP_KERNEL);
457 	if (!fp)
458 		return -ENOMEM;
459 
460 	fp->iface = altsd->bInterfaceNumber;
461 	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
462 	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
463 	fp->datainterval = 0;
464 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
465 	INIT_LIST_HEAD(&fp->list);
466 
467 	switch (fp->maxpacksize) {
468 	case 0x120:
469 		fp->rate_max = fp->rate_min = 44100;
470 		break;
471 	case 0x138:
472 	case 0x140:
473 		fp->rate_max = fp->rate_min = 48000;
474 		break;
475 	case 0x258:
476 	case 0x260:
477 		fp->rate_max = fp->rate_min = 96000;
478 		break;
479 	default:
480 		usb_audio_err(chip, "unknown sample rate\n");
481 		kfree(fp);
482 		return -ENXIO;
483 	}
484 
485 	stream = (fp->endpoint & USB_DIR_IN)
486 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
487 	err = snd_usb_add_audio_stream(chip, stream, fp);
488 	if (err < 0) {
489 		list_del(&fp->list); /* unlink for avoiding double-free */
490 		kfree(fp);
491 		return err;
492 	}
493 	usb_set_interface(chip->dev, fp->iface, 0);
494 	return 0;
495 }
496 
497 /*
498  * Create a standard mixer for the specified interface.
499  */
500 static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
501 				       struct usb_interface *iface,
502 				       struct usb_driver *driver,
503 				       const struct snd_usb_audio_quirk *quirk)
504 {
505 	if (quirk->ifnum < 0)
506 		return 0;
507 
508 	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
509 }
510 
511 
512 static int setup_fmt_after_resume_quirk(struct snd_usb_audio *chip,
513 				       struct usb_interface *iface,
514 				       struct usb_driver *driver,
515 				       const struct snd_usb_audio_quirk *quirk)
516 {
517 	chip->setup_fmt_after_resume_quirk = 1;
518 	return 1;	/* Continue with creating streams and mixer */
519 }
520 
521 /*
522  * audio-interface quirks
523  *
524  * returns zero if no standard audio/MIDI parsing is needed.
525  * returns a positive value if standard audio/midi interfaces are parsed
526  * after this.
527  * returns a negative value at error.
528  */
529 int snd_usb_create_quirk(struct snd_usb_audio *chip,
530 			 struct usb_interface *iface,
531 			 struct usb_driver *driver,
532 			 const struct snd_usb_audio_quirk *quirk)
533 {
534 	typedef int (*quirk_func_t)(struct snd_usb_audio *,
535 				    struct usb_interface *,
536 				    struct usb_driver *,
537 				    const struct snd_usb_audio_quirk *);
538 	static const quirk_func_t quirk_funcs[] = {
539 		[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
540 		[QUIRK_COMPOSITE] = create_composite_quirk,
541 		[QUIRK_AUTODETECT] = create_autodetect_quirks,
542 		[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
543 		[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
544 		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
545 		[QUIRK_MIDI_ROLAND] = create_any_midi_quirk,
546 		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
547 		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
548 		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
549 		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
550 		[QUIRK_MIDI_CME] = create_any_midi_quirk,
551 		[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
552 		[QUIRK_MIDI_FTDI] = create_any_midi_quirk,
553 		[QUIRK_MIDI_CH345] = create_any_midi_quirk,
554 		[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
555 		[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
556 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
557 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
558 		[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
559 		[QUIRK_SETUP_FMT_AFTER_RESUME] = setup_fmt_after_resume_quirk,
560 	};
561 
562 	if (quirk->type < QUIRK_TYPE_COUNT) {
563 		return quirk_funcs[quirk->type](chip, iface, driver, quirk);
564 	} else {
565 		usb_audio_err(chip, "invalid quirk type %d\n", quirk->type);
566 		return -ENXIO;
567 	}
568 }
569 
570 /*
571  * boot quirks
572  */
573 
574 #define EXTIGY_FIRMWARE_SIZE_OLD 794
575 #define EXTIGY_FIRMWARE_SIZE_NEW 483
576 
577 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
578 {
579 	struct usb_host_config *config = dev->actconfig;
580 	int err;
581 
582 	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
583 	    le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
584 		dev_dbg(&dev->dev, "sending Extigy boot sequence...\n");
585 		/* Send message to force it to reconnect with full interface. */
586 		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
587 				      0x10, 0x43, 0x0001, 0x000a, NULL, 0);
588 		if (err < 0)
589 			dev_dbg(&dev->dev, "error sending boot message: %d\n", err);
590 		err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
591 				&dev->descriptor, sizeof(dev->descriptor));
592 		config = dev->actconfig;
593 		if (err < 0)
594 			dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
595 		err = usb_reset_configuration(dev);
596 		if (err < 0)
597 			dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
598 		dev_dbg(&dev->dev, "extigy_boot: new boot length = %d\n",
599 			    le16_to_cpu(get_cfg_desc(config)->wTotalLength));
600 		return -ENODEV; /* quit this anyway */
601 	}
602 	return 0;
603 }
604 
605 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
606 {
607 	u8 buf = 1;
608 
609 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
610 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
611 			0, 0, &buf, 1);
612 	if (buf == 0) {
613 		snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
614 				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
615 				1, 2000, NULL, 0);
616 		return -ENODEV;
617 	}
618 	return 0;
619 }
620 
621 static int snd_usb_fasttrackpro_boot_quirk(struct usb_device *dev)
622 {
623 	int err;
624 
625 	if (dev->actconfig->desc.bConfigurationValue == 1) {
626 		dev_info(&dev->dev,
627 			   "Fast Track Pro switching to config #2\n");
628 		/* This function has to be available by the usb core module.
629 		 * if it is not avialable the boot quirk has to be left out
630 		 * and the configuration has to be set by udev or hotplug
631 		 * rules
632 		 */
633 		err = usb_driver_set_configuration(dev, 2);
634 		if (err < 0)
635 			dev_dbg(&dev->dev,
636 				"error usb_driver_set_configuration: %d\n",
637 				err);
638 		/* Always return an error, so that we stop creating a device
639 		   that will just be destroyed and recreated with a new
640 		   configuration */
641 		return -ENODEV;
642 	} else
643 		dev_info(&dev->dev, "Fast Track Pro config OK\n");
644 
645 	return 0;
646 }
647 
648 /*
649  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
650  * documented in the device's data sheet.
651  */
652 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
653 {
654 	u8 buf[4];
655 	buf[0] = 0x20;
656 	buf[1] = value & 0xff;
657 	buf[2] = (value >> 8) & 0xff;
658 	buf[3] = reg;
659 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
660 			       USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
661 			       0, 0, &buf, 4);
662 }
663 
664 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
665 {
666 	/*
667 	 * Enable line-out driver mode, set headphone source to front
668 	 * channels, enable stereo mic.
669 	 */
670 	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
671 }
672 
673 /*
674  * CM6206 registers from the CM6206 datasheet rev 2.1
675  */
676 #define CM6206_REG0_DMA_MASTER BIT(15)
677 #define CM6206_REG0_SPDIFO_RATE_48K (2 << 12)
678 #define CM6206_REG0_SPDIFO_RATE_96K (7 << 12)
679 /* Bit 4 thru 11 is the S/PDIF category code */
680 #define CM6206_REG0_SPDIFO_CAT_CODE_GENERAL (0 << 4)
681 #define CM6206_REG0_SPDIFO_EMPHASIS_CD BIT(3)
682 #define CM6206_REG0_SPDIFO_COPYRIGHT_NA BIT(2)
683 #define CM6206_REG0_SPDIFO_NON_AUDIO BIT(1)
684 #define CM6206_REG0_SPDIFO_PRO_FORMAT BIT(0)
685 
686 #define CM6206_REG1_TEST_SEL_CLK BIT(14)
687 #define CM6206_REG1_PLLBIN_EN BIT(13)
688 #define CM6206_REG1_SOFT_MUTE_EN BIT(12)
689 #define CM6206_REG1_GPIO4_OUT BIT(11)
690 #define CM6206_REG1_GPIO4_OE BIT(10)
691 #define CM6206_REG1_GPIO3_OUT BIT(9)
692 #define CM6206_REG1_GPIO3_OE BIT(8)
693 #define CM6206_REG1_GPIO2_OUT BIT(7)
694 #define CM6206_REG1_GPIO2_OE BIT(6)
695 #define CM6206_REG1_GPIO1_OUT BIT(5)
696 #define CM6206_REG1_GPIO1_OE BIT(4)
697 #define CM6206_REG1_SPDIFO_INVALID BIT(3)
698 #define CM6206_REG1_SPDIF_LOOP_EN BIT(2)
699 #define CM6206_REG1_SPDIFO_DIS BIT(1)
700 #define CM6206_REG1_SPDIFI_MIX BIT(0)
701 
702 #define CM6206_REG2_DRIVER_ON BIT(15)
703 #define CM6206_REG2_HEADP_SEL_SIDE_CHANNELS (0 << 13)
704 #define CM6206_REG2_HEADP_SEL_SURROUND_CHANNELS (1 << 13)
705 #define CM6206_REG2_HEADP_SEL_CENTER_SUBW (2 << 13)
706 #define CM6206_REG2_HEADP_SEL_FRONT_CHANNELS (3 << 13)
707 #define CM6206_REG2_MUTE_HEADPHONE_RIGHT BIT(12)
708 #define CM6206_REG2_MUTE_HEADPHONE_LEFT BIT(11)
709 #define CM6206_REG2_MUTE_REAR_SURROUND_RIGHT BIT(10)
710 #define CM6206_REG2_MUTE_REAR_SURROUND_LEFT BIT(9)
711 #define CM6206_REG2_MUTE_SIDE_SURROUND_RIGHT BIT(8)
712 #define CM6206_REG2_MUTE_SIDE_SURROUND_LEFT BIT(7)
713 #define CM6206_REG2_MUTE_SUBWOOFER BIT(6)
714 #define CM6206_REG2_MUTE_CENTER BIT(5)
715 #define CM6206_REG2_MUTE_RIGHT_FRONT BIT(3)
716 #define CM6206_REG2_MUTE_LEFT_FRONT BIT(3)
717 #define CM6206_REG2_EN_BTL BIT(2)
718 #define CM6206_REG2_MCUCLKSEL_1_5_MHZ (0)
719 #define CM6206_REG2_MCUCLKSEL_3_MHZ (1)
720 #define CM6206_REG2_MCUCLKSEL_6_MHZ (2)
721 #define CM6206_REG2_MCUCLKSEL_12_MHZ (3)
722 
723 /* Bit 11..13 sets the sensitivity to FLY tuner volume control VP/VD signal */
724 #define CM6206_REG3_FLYSPEED_DEFAULT (2 << 11)
725 #define CM6206_REG3_VRAP25EN BIT(10)
726 #define CM6206_REG3_MSEL1 BIT(9)
727 #define CM6206_REG3_SPDIFI_RATE_44_1K BIT(0 << 7)
728 #define CM6206_REG3_SPDIFI_RATE_48K BIT(2 << 7)
729 #define CM6206_REG3_SPDIFI_RATE_32K BIT(3 << 7)
730 #define CM6206_REG3_PINSEL BIT(6)
731 #define CM6206_REG3_FOE BIT(5)
732 #define CM6206_REG3_ROE BIT(4)
733 #define CM6206_REG3_CBOE BIT(3)
734 #define CM6206_REG3_LOSE BIT(2)
735 #define CM6206_REG3_HPOE BIT(1)
736 #define CM6206_REG3_SPDIFI_CANREC BIT(0)
737 
738 #define CM6206_REG5_DA_RSTN BIT(13)
739 #define CM6206_REG5_AD_RSTN BIT(12)
740 #define CM6206_REG5_SPDIFO_AD2SPDO BIT(12)
741 #define CM6206_REG5_SPDIFO_SEL_FRONT (0 << 9)
742 #define CM6206_REG5_SPDIFO_SEL_SIDE_SUR (1 << 9)
743 #define CM6206_REG5_SPDIFO_SEL_CEN_LFE (2 << 9)
744 #define CM6206_REG5_SPDIFO_SEL_REAR_SUR (3 << 9)
745 #define CM6206_REG5_CODECM BIT(8)
746 #define CM6206_REG5_EN_HPF BIT(7)
747 #define CM6206_REG5_T_SEL_DSDA4 BIT(6)
748 #define CM6206_REG5_T_SEL_DSDA3 BIT(5)
749 #define CM6206_REG5_T_SEL_DSDA2 BIT(4)
750 #define CM6206_REG5_T_SEL_DSDA1 BIT(3)
751 #define CM6206_REG5_T_SEL_DSDAD_NORMAL 0
752 #define CM6206_REG5_T_SEL_DSDAD_FRONT 4
753 #define CM6206_REG5_T_SEL_DSDAD_S_SURROUND 5
754 #define CM6206_REG5_T_SEL_DSDAD_CEN_LFE 6
755 #define CM6206_REG5_T_SEL_DSDAD_R_SURROUND 7
756 
757 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
758 {
759 	int err  = 0, reg;
760 	int val[] = {
761 		/*
762 		 * Values here are chosen based on sniffing USB traffic
763 		 * under Windows.
764 		 *
765 		 * REG0: DAC is master, sample rate 48kHz, no copyright
766 		 */
767 		CM6206_REG0_SPDIFO_RATE_48K |
768 		CM6206_REG0_SPDIFO_COPYRIGHT_NA,
769 		/*
770 		 * REG1: PLL binary search enable, soft mute enable.
771 		 */
772 		CM6206_REG1_PLLBIN_EN |
773 		CM6206_REG1_SOFT_MUTE_EN,
774 		/*
775 		 * REG2: enable output drivers,
776 		 * select front channels to the headphone output,
777 		 * then mute the headphone channels, run the MCU
778 		 * at 1.5 MHz.
779 		 */
780 		CM6206_REG2_DRIVER_ON |
781 		CM6206_REG2_HEADP_SEL_FRONT_CHANNELS |
782 		CM6206_REG2_MUTE_HEADPHONE_RIGHT |
783 		CM6206_REG2_MUTE_HEADPHONE_LEFT,
784 		/*
785 		 * REG3: default flyspeed, set 2.5V mic bias
786 		 * enable all line out ports and enable SPDIF
787 		 */
788 		CM6206_REG3_FLYSPEED_DEFAULT |
789 		CM6206_REG3_VRAP25EN |
790 		CM6206_REG3_FOE |
791 		CM6206_REG3_ROE |
792 		CM6206_REG3_CBOE |
793 		CM6206_REG3_LOSE |
794 		CM6206_REG3_HPOE |
795 		CM6206_REG3_SPDIFI_CANREC,
796 		/* REG4 is just a bunch of GPIO lines */
797 		0x0000,
798 		/* REG5: de-assert AD/DA reset signals */
799 		CM6206_REG5_DA_RSTN |
800 		CM6206_REG5_AD_RSTN };
801 
802 	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
803 		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
804 		if (err < 0)
805 			return err;
806 	}
807 
808 	return err;
809 }
810 
811 /* quirk for Plantronics GameCom 780 with CM6302 chip */
812 static int snd_usb_gamecon780_boot_quirk(struct usb_device *dev)
813 {
814 	/* set the initial volume and don't change; other values are either
815 	 * too loud or silent due to firmware bug (bko#65251)
816 	 */
817 	u8 buf[2] = { 0x74, 0xe3 };
818 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
819 			USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
820 			UAC_FU_VOLUME << 8, 9 << 8, buf, 2);
821 }
822 
823 /*
824  * Novation Twitch DJ controller
825  * Focusrite Novation Saffire 6 USB audio card
826  */
827 static int snd_usb_novation_boot_quirk(struct usb_device *dev)
828 {
829 	/* preemptively set up the device because otherwise the
830 	 * raw MIDI endpoints are not active */
831 	usb_set_interface(dev, 0, 1);
832 	return 0;
833 }
834 
835 /*
836  * This call will put the synth in "USB send" mode, i.e it will send MIDI
837  * messages through USB (this is disabled at startup). The synth will
838  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
839  * sign on its LCD. Values here are chosen based on sniffing USB traffic
840  * under Windows.
841  */
842 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
843 {
844 	int err, actual_length;
845 	/* "midi send" enable */
846 	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
847 	void *buf;
848 
849 	if (snd_usb_pipe_sanity_check(dev, usb_sndintpipe(dev, 0x05)))
850 		return -EINVAL;
851 	buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
852 	if (!buf)
853 		return -ENOMEM;
854 	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
855 			ARRAY_SIZE(seq), &actual_length, 1000);
856 	kfree(buf);
857 	if (err < 0)
858 		return err;
859 
860 	return 0;
861 }
862 
863 /*
864  * Some sound cards from Native Instruments are in fact compliant to the USB
865  * audio standard of version 2 and other approved USB standards, even though
866  * they come up as vendor-specific device when first connected.
867  *
868  * However, they can be told to come up with a new set of descriptors
869  * upon their next enumeration, and the interfaces announced by the new
870  * descriptors will then be handled by the kernel's class drivers. As the
871  * product ID will also change, no further checks are required.
872  */
873 
874 static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
875 {
876 	int ret;
877 
878 	if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
879 		return -EINVAL;
880 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
881 				  0xaf, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
882 				  1, 0, NULL, 0, 1000);
883 
884 	if (ret < 0)
885 		return ret;
886 
887 	usb_reset_device(dev);
888 
889 	/* return -EAGAIN, so the creation of an audio interface for this
890 	 * temporary device is aborted. The device will reconnect with a
891 	 * new product ID */
892 	return -EAGAIN;
893 }
894 
895 static void mbox2_setup_48_24_magic(struct usb_device *dev)
896 {
897 	u8 srate[3];
898 	u8 temp[12];
899 
900 	/* Choose 48000Hz permanently */
901 	srate[0] = 0x80;
902 	srate[1] = 0xbb;
903 	srate[2] = 0x00;
904 
905 	/* Send the magic! */
906 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
907 		0x01, 0x22, 0x0100, 0x0085, &temp, 0x0003);
908 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
909 		0x81, 0xa2, 0x0100, 0x0085, &srate, 0x0003);
910 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
911 		0x81, 0xa2, 0x0100, 0x0086, &srate, 0x0003);
912 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
913 		0x81, 0xa2, 0x0100, 0x0003, &srate, 0x0003);
914 	return;
915 }
916 
917 /* Digidesign Mbox 2 needs to load firmware onboard
918  * and driver must wait a few seconds for initialisation.
919  */
920 
921 #define MBOX2_FIRMWARE_SIZE    646
922 #define MBOX2_BOOT_LOADING     0x01 /* Hard coded into the device */
923 #define MBOX2_BOOT_READY       0x02 /* Hard coded into the device */
924 
925 static int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
926 {
927 	struct usb_host_config *config = dev->actconfig;
928 	int err;
929 	u8 bootresponse[0x12];
930 	int fwsize;
931 	int count;
932 
933 	fwsize = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
934 
935 	if (fwsize != MBOX2_FIRMWARE_SIZE) {
936 		dev_err(&dev->dev, "Invalid firmware size=%d.\n", fwsize);
937 		return -ENODEV;
938 	}
939 
940 	dev_dbg(&dev->dev, "Sending Digidesign Mbox 2 boot sequence...\n");
941 
942 	count = 0;
943 	bootresponse[0] = MBOX2_BOOT_LOADING;
944 	while ((bootresponse[0] == MBOX2_BOOT_LOADING) && (count < 10)) {
945 		msleep(500); /* 0.5 second delay */
946 		snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
947 			/* Control magic - load onboard firmware */
948 			0x85, 0xc0, 0x0001, 0x0000, &bootresponse, 0x0012);
949 		if (bootresponse[0] == MBOX2_BOOT_READY)
950 			break;
951 		dev_dbg(&dev->dev, "device not ready, resending boot sequence...\n");
952 		count++;
953 	}
954 
955 	if (bootresponse[0] != MBOX2_BOOT_READY) {
956 		dev_err(&dev->dev, "Unknown bootresponse=%d, or timed out, ignoring device.\n", bootresponse[0]);
957 		return -ENODEV;
958 	}
959 
960 	dev_dbg(&dev->dev, "device initialised!\n");
961 
962 	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
963 		&dev->descriptor, sizeof(dev->descriptor));
964 	config = dev->actconfig;
965 	if (err < 0)
966 		dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
967 
968 	err = usb_reset_configuration(dev);
969 	if (err < 0)
970 		dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
971 	dev_dbg(&dev->dev, "mbox2_boot: new boot length = %d\n",
972 		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
973 
974 	mbox2_setup_48_24_magic(dev);
975 
976 	dev_info(&dev->dev, "Digidesign Mbox 2: 24bit 48kHz");
977 
978 	return 0; /* Successful boot */
979 }
980 
981 static int snd_usb_axefx3_boot_quirk(struct usb_device *dev)
982 {
983 	int err;
984 
985 	dev_dbg(&dev->dev, "Waiting for Axe-Fx III to boot up...\n");
986 
987 	if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
988 		return -EINVAL;
989 	/* If the Axe-Fx III has not fully booted, it will timeout when trying
990 	 * to enable the audio streaming interface. A more generous timeout is
991 	 * used here to detect when the Axe-Fx III has finished booting as the
992 	 * set interface message will be acked once it has
993 	 */
994 	err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
995 				USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
996 				1, 1, NULL, 0, 120000);
997 	if (err < 0) {
998 		dev_err(&dev->dev,
999 			"failed waiting for Axe-Fx III to boot: %d\n", err);
1000 		return err;
1001 	}
1002 
1003 	dev_dbg(&dev->dev, "Axe-Fx III is now ready\n");
1004 
1005 	err = usb_set_interface(dev, 1, 0);
1006 	if (err < 0)
1007 		dev_dbg(&dev->dev,
1008 			"error stopping Axe-Fx III interface: %d\n", err);
1009 
1010 	return 0;
1011 }
1012 
1013 
1014 #define MICROBOOK_BUF_SIZE 128
1015 
1016 static int snd_usb_motu_microbookii_communicate(struct usb_device *dev, u8 *buf,
1017 						int buf_size, int *length)
1018 {
1019 	int err, actual_length;
1020 
1021 	if (snd_usb_pipe_sanity_check(dev, usb_sndintpipe(dev, 0x01)))
1022 		return -EINVAL;
1023 	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x01), buf, *length,
1024 				&actual_length, 1000);
1025 	if (err < 0)
1026 		return err;
1027 
1028 	print_hex_dump(KERN_DEBUG, "MicroBookII snd: ", DUMP_PREFIX_NONE, 16, 1,
1029 		       buf, actual_length, false);
1030 
1031 	memset(buf, 0, buf_size);
1032 
1033 	if (snd_usb_pipe_sanity_check(dev, usb_rcvintpipe(dev, 0x82)))
1034 		return -EINVAL;
1035 	err = usb_interrupt_msg(dev, usb_rcvintpipe(dev, 0x82), buf, buf_size,
1036 				&actual_length, 1000);
1037 	if (err < 0)
1038 		return err;
1039 
1040 	print_hex_dump(KERN_DEBUG, "MicroBookII rcv: ", DUMP_PREFIX_NONE, 16, 1,
1041 		       buf, actual_length, false);
1042 
1043 	*length = actual_length;
1044 	return 0;
1045 }
1046 
1047 static int snd_usb_motu_microbookii_boot_quirk(struct usb_device *dev)
1048 {
1049 	int err, actual_length, poll_attempts = 0;
1050 	static const u8 set_samplerate_seq[] = { 0x00, 0x00, 0x00, 0x00,
1051 						 0x00, 0x00, 0x0b, 0x14,
1052 						 0x00, 0x00, 0x00, 0x01 };
1053 	static const u8 poll_ready_seq[] = { 0x00, 0x04, 0x00, 0x00,
1054 					     0x00, 0x00, 0x0b, 0x18 };
1055 	u8 *buf = kzalloc(MICROBOOK_BUF_SIZE, GFP_KERNEL);
1056 
1057 	if (!buf)
1058 		return -ENOMEM;
1059 
1060 	dev_info(&dev->dev, "Waiting for MOTU Microbook II to boot up...\n");
1061 
1062 	/* First we tell the device which sample rate to use. */
1063 	memcpy(buf, set_samplerate_seq, sizeof(set_samplerate_seq));
1064 	actual_length = sizeof(set_samplerate_seq);
1065 	err = snd_usb_motu_microbookii_communicate(dev, buf, MICROBOOK_BUF_SIZE,
1066 						   &actual_length);
1067 
1068 	if (err < 0) {
1069 		dev_err(&dev->dev,
1070 			"failed setting the sample rate for Motu MicroBook II: %d\n",
1071 			err);
1072 		goto free_buf;
1073 	}
1074 
1075 	/* Then we poll every 100 ms until the device informs of its readiness. */
1076 	while (true) {
1077 		if (++poll_attempts > 100) {
1078 			dev_err(&dev->dev,
1079 				"failed booting Motu MicroBook II: timeout\n");
1080 			err = -ENODEV;
1081 			goto free_buf;
1082 		}
1083 
1084 		memset(buf, 0, MICROBOOK_BUF_SIZE);
1085 		memcpy(buf, poll_ready_seq, sizeof(poll_ready_seq));
1086 
1087 		actual_length = sizeof(poll_ready_seq);
1088 		err = snd_usb_motu_microbookii_communicate(
1089 			dev, buf, MICROBOOK_BUF_SIZE, &actual_length);
1090 		if (err < 0) {
1091 			dev_err(&dev->dev,
1092 				"failed booting Motu MicroBook II: communication error %d\n",
1093 				err);
1094 			goto free_buf;
1095 		}
1096 
1097 		/* the device signals its readiness through a message of the
1098 		 * form
1099 		 *           XX 06 00 00 00 00 0b 18  00 00 00 01
1100 		 * If the device is not yet ready to accept audio data, the
1101 		 * last byte of that sequence is 00.
1102 		 */
1103 		if (actual_length == 12 && buf[actual_length - 1] == 1)
1104 			break;
1105 
1106 		msleep(100);
1107 	}
1108 
1109 	dev_info(&dev->dev, "MOTU MicroBook II ready\n");
1110 
1111 free_buf:
1112 	kfree(buf);
1113 	return err;
1114 }
1115 
1116 static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev)
1117 {
1118 	int ret;
1119 
1120 	if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
1121 		return -EINVAL;
1122 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1123 			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
1124 			      0x0, 0, NULL, 0, 1000);
1125 
1126 	if (ret < 0)
1127 		return ret;
1128 
1129 	msleep(2000);
1130 
1131 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1132 			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
1133 			      0x20, 0, NULL, 0, 1000);
1134 
1135 	if (ret < 0)
1136 		return ret;
1137 
1138 	return 0;
1139 }
1140 
1141 /*
1142  * Setup quirks
1143  */
1144 #define MAUDIO_SET		0x01 /* parse device_setup */
1145 #define MAUDIO_SET_COMPATIBLE	0x80 /* use only "win-compatible" interfaces */
1146 #define MAUDIO_SET_DTS		0x02 /* enable DTS Digital Output */
1147 #define MAUDIO_SET_96K		0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
1148 #define MAUDIO_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
1149 #define MAUDIO_SET_DI		0x10 /* enable Digital Input */
1150 #define MAUDIO_SET_MASK		0x1f /* bit mask for setup value */
1151 #define MAUDIO_SET_24B_48K_DI	 0x19 /* 24bits+48KHz+Digital Input */
1152 #define MAUDIO_SET_24B_48K_NOTDI 0x09 /* 24bits+48KHz+No Digital Input */
1153 #define MAUDIO_SET_16B_48K_DI	 0x11 /* 16bits+48KHz+Digital Input */
1154 #define MAUDIO_SET_16B_48K_NOTDI 0x01 /* 16bits+48KHz+No Digital Input */
1155 
1156 static int quattro_skip_setting_quirk(struct snd_usb_audio *chip,
1157 				      int iface, int altno)
1158 {
1159 	/* Reset ALL ifaces to 0 altsetting.
1160 	 * Call it for every possible altsetting of every interface.
1161 	 */
1162 	usb_set_interface(chip->dev, iface, 0);
1163 	if (chip->setup & MAUDIO_SET) {
1164 		if (chip->setup & MAUDIO_SET_COMPATIBLE) {
1165 			if (iface != 1 && iface != 2)
1166 				return 1; /* skip all interfaces but 1 and 2 */
1167 		} else {
1168 			unsigned int mask;
1169 			if (iface == 1 || iface == 2)
1170 				return 1; /* skip interfaces 1 and 2 */
1171 			if ((chip->setup & MAUDIO_SET_96K) && altno != 1)
1172 				return 1; /* skip this altsetting */
1173 			mask = chip->setup & MAUDIO_SET_MASK;
1174 			if (mask == MAUDIO_SET_24B_48K_DI && altno != 2)
1175 				return 1; /* skip this altsetting */
1176 			if (mask == MAUDIO_SET_24B_48K_NOTDI && altno != 3)
1177 				return 1; /* skip this altsetting */
1178 			if (mask == MAUDIO_SET_16B_48K_NOTDI && altno != 4)
1179 				return 1; /* skip this altsetting */
1180 		}
1181 	}
1182 	usb_audio_dbg(chip,
1183 		    "using altsetting %d for interface %d config %d\n",
1184 		    altno, iface, chip->setup);
1185 	return 0; /* keep this altsetting */
1186 }
1187 
1188 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
1189 					 int iface,
1190 					 int altno)
1191 {
1192 	/* Reset ALL ifaces to 0 altsetting.
1193 	 * Call it for every possible altsetting of every interface.
1194 	 */
1195 	usb_set_interface(chip->dev, iface, 0);
1196 
1197 	if (chip->setup & MAUDIO_SET) {
1198 		unsigned int mask;
1199 		if ((chip->setup & MAUDIO_SET_DTS) && altno != 6)
1200 			return 1; /* skip this altsetting */
1201 		if ((chip->setup & MAUDIO_SET_96K) && altno != 1)
1202 			return 1; /* skip this altsetting */
1203 		mask = chip->setup & MAUDIO_SET_MASK;
1204 		if (mask == MAUDIO_SET_24B_48K_DI && altno != 2)
1205 			return 1; /* skip this altsetting */
1206 		if (mask == MAUDIO_SET_24B_48K_NOTDI && altno != 3)
1207 			return 1; /* skip this altsetting */
1208 		if (mask == MAUDIO_SET_16B_48K_DI && altno != 4)
1209 			return 1; /* skip this altsetting */
1210 		if (mask == MAUDIO_SET_16B_48K_NOTDI && altno != 5)
1211 			return 1; /* skip this altsetting */
1212 	}
1213 
1214 	return 0; /* keep this altsetting */
1215 }
1216 
1217 static int fasttrackpro_skip_setting_quirk(struct snd_usb_audio *chip,
1218 					   int iface, int altno)
1219 {
1220 	/* Reset ALL ifaces to 0 altsetting.
1221 	 * Call it for every possible altsetting of every interface.
1222 	 */
1223 	usb_set_interface(chip->dev, iface, 0);
1224 
1225 	/* possible configuration where both inputs and only one output is
1226 	 *used is not supported by the current setup
1227 	 */
1228 	if (chip->setup & (MAUDIO_SET | MAUDIO_SET_24B)) {
1229 		if (chip->setup & MAUDIO_SET_96K) {
1230 			if (altno != 3 && altno != 6)
1231 				return 1;
1232 		} else if (chip->setup & MAUDIO_SET_DI) {
1233 			if (iface == 4)
1234 				return 1; /* no analog input */
1235 			if (altno != 2 && altno != 5)
1236 				return 1; /* enable only altsets 2 and 5 */
1237 		} else {
1238 			if (iface == 5)
1239 				return 1; /* disable digialt input */
1240 			if (altno != 2 && altno != 5)
1241 				return 1; /* enalbe only altsets 2 and 5 */
1242 		}
1243 	} else {
1244 		/* keep only 16-Bit mode */
1245 		if (altno != 1)
1246 			return 1;
1247 	}
1248 
1249 	usb_audio_dbg(chip,
1250 		    "using altsetting %d for interface %d config %d\n",
1251 		    altno, iface, chip->setup);
1252 	return 0; /* keep this altsetting */
1253 }
1254 
1255 static int s1810c_skip_setting_quirk(struct snd_usb_audio *chip,
1256 					   int iface, int altno)
1257 {
1258 	/*
1259 	 * Altno settings:
1260 	 *
1261 	 * Playback (Interface 1):
1262 	 * 1: 6 Analog + 2 S/PDIF
1263 	 * 2: 6 Analog + 2 S/PDIF
1264 	 * 3: 6 Analog
1265 	 *
1266 	 * Capture (Interface 2):
1267 	 * 1: 8 Analog + 2 S/PDIF + 8 ADAT
1268 	 * 2: 8 Analog + 2 S/PDIF + 4 ADAT
1269 	 * 3: 8 Analog
1270 	 */
1271 
1272 	/*
1273 	 * I'll leave 2 as the default one and
1274 	 * use device_setup to switch to the
1275 	 * other two.
1276 	 */
1277 	if ((chip->setup == 0 || chip->setup > 2) && altno != 2)
1278 		return 1;
1279 	else if (chip->setup == 1 && altno != 1)
1280 		return 1;
1281 	else if (chip->setup == 2 && altno != 3)
1282 		return 1;
1283 
1284 	return 0;
1285 }
1286 
1287 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
1288 				  int iface,
1289 				  int altno)
1290 {
1291 	/* audiophile usb: skip altsets incompatible with device_setup */
1292 	if (chip->usb_id == USB_ID(0x0763, 0x2003))
1293 		return audiophile_skip_setting_quirk(chip, iface, altno);
1294 	/* quattro usb: skip altsets incompatible with device_setup */
1295 	if (chip->usb_id == USB_ID(0x0763, 0x2001))
1296 		return quattro_skip_setting_quirk(chip, iface, altno);
1297 	/* fasttrackpro usb: skip altsets incompatible with device_setup */
1298 	if (chip->usb_id == USB_ID(0x0763, 0x2012))
1299 		return fasttrackpro_skip_setting_quirk(chip, iface, altno);
1300 	/* presonus studio 1810c: skip altsets incompatible with device_setup */
1301 	if (chip->usb_id == USB_ID(0x0194f, 0x010c))
1302 		return s1810c_skip_setting_quirk(chip, iface, altno);
1303 
1304 
1305 	return 0;
1306 }
1307 
1308 int snd_usb_apply_boot_quirk(struct usb_device *dev,
1309 			     struct usb_interface *intf,
1310 			     const struct snd_usb_audio_quirk *quirk,
1311 			     unsigned int id)
1312 {
1313 	switch (id) {
1314 	case USB_ID(0x041e, 0x3000):
1315 		/* SB Extigy needs special boot-up sequence */
1316 		/* if more models come, this will go to the quirk list. */
1317 		return snd_usb_extigy_boot_quirk(dev, intf);
1318 
1319 	case USB_ID(0x041e, 0x3020):
1320 		/* SB Audigy 2 NX needs its own boot-up magic, too */
1321 		return snd_usb_audigy2nx_boot_quirk(dev);
1322 
1323 	case USB_ID(0x10f5, 0x0200):
1324 		/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
1325 		return snd_usb_cm106_boot_quirk(dev);
1326 
1327 	case USB_ID(0x0d8c, 0x0102):
1328 		/* C-Media CM6206 / CM106-Like Sound Device */
1329 	case USB_ID(0x0ccd, 0x00b1): /* Terratec Aureon 7.1 USB */
1330 		return snd_usb_cm6206_boot_quirk(dev);
1331 
1332 	case USB_ID(0x0dba, 0x3000):
1333 		/* Digidesign Mbox 2 */
1334 		return snd_usb_mbox2_boot_quirk(dev);
1335 
1336 	case USB_ID(0x1235, 0x0010): /* Focusrite Novation Saffire 6 USB */
1337 	case USB_ID(0x1235, 0x0018): /* Focusrite Novation Twitch */
1338 		return snd_usb_novation_boot_quirk(dev);
1339 
1340 	case USB_ID(0x133e, 0x0815):
1341 		/* Access Music VirusTI Desktop */
1342 		return snd_usb_accessmusic_boot_quirk(dev);
1343 
1344 	case USB_ID(0x17cc, 0x1000): /* Komplete Audio 6 */
1345 	case USB_ID(0x17cc, 0x1010): /* Traktor Audio 6 */
1346 	case USB_ID(0x17cc, 0x1020): /* Traktor Audio 10 */
1347 		return snd_usb_nativeinstruments_boot_quirk(dev);
1348 	case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
1349 		return snd_usb_fasttrackpro_boot_quirk(dev);
1350 	case USB_ID(0x047f, 0xc010): /* Plantronics Gamecom 780 */
1351 		return snd_usb_gamecon780_boot_quirk(dev);
1352 	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx 3 */
1353 		return snd_usb_axefx3_boot_quirk(dev);
1354 	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
1355 		/*
1356 		 * For some reason interface 3 with vendor-spec class is
1357 		 * detected on MicroBook IIc.
1358 		 */
1359 		if (get_iface_desc(intf->altsetting)->bInterfaceClass ==
1360 		    USB_CLASS_VENDOR_SPEC &&
1361 		    get_iface_desc(intf->altsetting)->bInterfaceNumber < 3)
1362 			return snd_usb_motu_microbookii_boot_quirk(dev);
1363 		break;
1364 	}
1365 
1366 	return 0;
1367 }
1368 
1369 int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
1370 				  struct usb_interface *intf,
1371 				  const struct snd_usb_audio_quirk *quirk,
1372 				  unsigned int id)
1373 {
1374 	switch (id) {
1375 	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
1376 		return snd_usb_motu_m_series_boot_quirk(dev);
1377 	}
1378 
1379 	return 0;
1380 }
1381 
1382 /*
1383  * check if the device uses big-endian samples
1384  */
1385 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
1386 {
1387 	/* it depends on altsetting whether the device is big-endian or not */
1388 	switch (chip->usb_id) {
1389 	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
1390 		if (fp->altsetting == 2 || fp->altsetting == 3 ||
1391 			fp->altsetting == 5 || fp->altsetting == 6)
1392 			return 1;
1393 		break;
1394 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
1395 		if (chip->setup == 0x00 ||
1396 			fp->altsetting == 1 || fp->altsetting == 2 ||
1397 			fp->altsetting == 3)
1398 			return 1;
1399 		break;
1400 	case USB_ID(0x0763, 0x2012): /* M-Audio Fast Track Pro */
1401 		if (fp->altsetting == 2 || fp->altsetting == 3 ||
1402 			fp->altsetting == 5 || fp->altsetting == 6)
1403 			return 1;
1404 		break;
1405 	}
1406 	return 0;
1407 }
1408 
1409 /*
1410  * For E-Mu 0404USB/0202USB/TrackerPre/0204 sample rate should be set for device,
1411  * not for interface.
1412  */
1413 
1414 enum {
1415 	EMU_QUIRK_SR_44100HZ = 0,
1416 	EMU_QUIRK_SR_48000HZ,
1417 	EMU_QUIRK_SR_88200HZ,
1418 	EMU_QUIRK_SR_96000HZ,
1419 	EMU_QUIRK_SR_176400HZ,
1420 	EMU_QUIRK_SR_192000HZ
1421 };
1422 
1423 static void set_format_emu_quirk(struct snd_usb_substream *subs,
1424 				 struct audioformat *fmt)
1425 {
1426 	unsigned char emu_samplerate_id = 0;
1427 
1428 	/* When capture is active
1429 	 * sample rate shouldn't be changed
1430 	 * by playback substream
1431 	 */
1432 	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
1433 		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
1434 			return;
1435 	}
1436 
1437 	switch (fmt->rate_min) {
1438 	case 48000:
1439 		emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
1440 		break;
1441 	case 88200:
1442 		emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
1443 		break;
1444 	case 96000:
1445 		emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
1446 		break;
1447 	case 176400:
1448 		emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
1449 		break;
1450 	case 192000:
1451 		emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
1452 		break;
1453 	default:
1454 		emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
1455 		break;
1456 	}
1457 	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
1458 	subs->pkt_offset_adj = (emu_samplerate_id >= EMU_QUIRK_SR_176400HZ) ? 4 : 0;
1459 }
1460 
1461 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
1462 			      struct audioformat *fmt)
1463 {
1464 	switch (subs->stream->chip->usb_id) {
1465 	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
1466 	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
1467 	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
1468 	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
1469 		set_format_emu_quirk(subs, fmt);
1470 		break;
1471 	}
1472 }
1473 
1474 bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip)
1475 {
1476 	/* devices which do not support reading the sample rate. */
1477 	switch (chip->usb_id) {
1478 	case USB_ID(0x041e, 0x4080): /* Creative Live Cam VF0610 */
1479 	case USB_ID(0x04d8, 0xfeea): /* Benchmark DAC1 Pre */
1480 	case USB_ID(0x0556, 0x0014): /* Phoenix Audio TMX320VC */
1481 	case USB_ID(0x05a3, 0x9420): /* ELP HD USB Camera */
1482 	case USB_ID(0x05a7, 0x1020): /* Bose Companion 5 */
1483 	case USB_ID(0x074d, 0x3553): /* Outlaw RR2150 (Micronas UAC3553B) */
1484 	case USB_ID(0x1395, 0x740a): /* Sennheiser DECT */
1485 	case USB_ID(0x1901, 0x0191): /* GE B850V3 CP2114 audio interface */
1486 	case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */
1487 	case USB_ID(0x2912, 0x30c8): /* Audioengine D1 */
1488 		return true;
1489 	}
1490 
1491 	/* devices of these vendors don't support reading rate, either */
1492 	switch (USB_ID_VENDOR(chip->usb_id)) {
1493 	case 0x045e: /* MS Lifecam */
1494 	case 0x047f: /* Plantronics */
1495 	case 0x1de7: /* Phoenix Audio */
1496 		return true;
1497 	}
1498 
1499 	return false;
1500 }
1501 
1502 /* ITF-USB DSD based DACs need a vendor cmd to switch
1503  * between PCM and native DSD mode
1504  */
1505 static bool is_itf_usb_dsd_dac(unsigned int id)
1506 {
1507 	switch (id) {
1508 	case USB_ID(0x154e, 0x1003): /* Denon DA-300USB */
1509 	case USB_ID(0x154e, 0x3005): /* Marantz HD-DAC1 */
1510 	case USB_ID(0x154e, 0x3006): /* Marantz SA-14S1 */
1511 	case USB_ID(0x1852, 0x5065): /* Luxman DA-06 */
1512 	case USB_ID(0x0644, 0x8043): /* TEAC UD-501/UD-501V2/UD-503/NT-503 */
1513 	case USB_ID(0x0644, 0x8044): /* Esoteric D-05X */
1514 	case USB_ID(0x0644, 0x804a): /* TEAC UD-301 */
1515 		return true;
1516 	}
1517 	return false;
1518 }
1519 
1520 int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
1521 			      struct audioformat *fmt)
1522 {
1523 	struct usb_device *dev = subs->dev;
1524 	int err;
1525 
1526 	if (is_itf_usb_dsd_dac(subs->stream->chip->usb_id)) {
1527 		/* First switch to alt set 0, otherwise the mode switch cmd
1528 		 * will not be accepted by the DAC
1529 		 */
1530 		err = usb_set_interface(dev, fmt->iface, 0);
1531 		if (err < 0)
1532 			return err;
1533 
1534 		msleep(20); /* Delay needed after setting the interface */
1535 
1536 		/* Vendor mode switch cmd is required. */
1537 		if (fmt->formats & SNDRV_PCM_FMTBIT_DSD_U32_BE) {
1538 			/* DSD mode (DSD_U32) requested */
1539 			err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0,
1540 					      USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1541 					      1, 1, NULL, 0);
1542 			if (err < 0)
1543 				return err;
1544 
1545 		} else {
1546 			/* PCM or DOP mode (S32) requested */
1547 			/* PCM mode (S16) requested */
1548 			err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0,
1549 					      USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1550 					      0, 1, NULL, 0);
1551 			if (err < 0)
1552 				return err;
1553 
1554 		}
1555 		msleep(20);
1556 	}
1557 	return 0;
1558 }
1559 
1560 void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
1561 {
1562 	/*
1563 	 * "Playback Design" products send bogus feedback data at the start
1564 	 * of the stream. Ignore them.
1565 	 */
1566 	if (USB_ID_VENDOR(ep->chip->usb_id) == 0x23ba &&
1567 	    ep->type == SND_USB_ENDPOINT_TYPE_SYNC)
1568 		ep->skip_packets = 4;
1569 
1570 	/*
1571 	 * M-Audio Fast Track C400/C600 - when packets are not skipped, real
1572 	 * world latency varies by approx. +/- 50 frames (at 96KHz) each time
1573 	 * the stream is (re)started. When skipping packets 16 at endpoint
1574 	 * start up, the real world latency is stable within +/- 1 frame (also
1575 	 * across power cycles).
1576 	 */
1577 	if ((ep->chip->usb_id == USB_ID(0x0763, 0x2030) ||
1578 	     ep->chip->usb_id == USB_ID(0x0763, 0x2031)) &&
1579 	    ep->type == SND_USB_ENDPOINT_TYPE_DATA)
1580 		ep->skip_packets = 16;
1581 
1582 	/* Work around devices that report unreasonable feedback data */
1583 	if ((ep->chip->usb_id == USB_ID(0x0644, 0x8038) ||  /* TEAC UD-H01 */
1584 	     ep->chip->usb_id == USB_ID(0x1852, 0x5034)) && /* T+A Dac8 */
1585 	    ep->syncmaxsize == 4)
1586 		ep->tenor_fb_quirk = 1;
1587 }
1588 
1589 void snd_usb_set_interface_quirk(struct usb_device *dev)
1590 {
1591 	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);
1592 
1593 	if (!chip)
1594 		return;
1595 	/*
1596 	 * "Playback Design" products need a 50ms delay after setting the
1597 	 * USB interface.
1598 	 */
1599 	switch (USB_ID_VENDOR(chip->usb_id)) {
1600 	case 0x23ba: /* Playback Design */
1601 	case 0x0644: /* TEAC Corp. */
1602 		msleep(50);
1603 		break;
1604 	}
1605 }
1606 
1607 /* quirk applied after snd_usb_ctl_msg(); not applied during boot quirks */
1608 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
1609 			   __u8 request, __u8 requesttype, __u16 value,
1610 			   __u16 index, void *data, __u16 size)
1611 {
1612 	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);
1613 
1614 	if (!chip)
1615 		return;
1616 	/*
1617 	 * "Playback Design" products need a 20ms delay after each
1618 	 * class compliant request
1619 	 */
1620 	if (USB_ID_VENDOR(chip->usb_id) == 0x23ba &&
1621 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1622 		msleep(20);
1623 
1624 	/*
1625 	 * "TEAC Corp." products need a 20ms delay after each
1626 	 * class compliant request
1627 	 */
1628 	if (USB_ID_VENDOR(chip->usb_id) == 0x0644 &&
1629 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1630 		msleep(20);
1631 
1632 	/* ITF-USB DSD based DACs functionality need a delay
1633 	 * after each class compliant request
1634 	 */
1635 	if (is_itf_usb_dsd_dac(chip->usb_id)
1636 	    && (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1637 		msleep(20);
1638 
1639 	/* Zoom R16/24, Logitech H650e, Jabra 550a needs a tiny delay here,
1640 	 * otherwise requests like get/set frequency return as failed despite
1641 	 * actually succeeding.
1642 	 */
1643 	if ((chip->usb_id == USB_ID(0x1686, 0x00dd) ||
1644 	     chip->usb_id == USB_ID(0x046d, 0x0a46) ||
1645 	     chip->usb_id == USB_ID(0x0b0e, 0x0349)) &&
1646 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1647 		usleep_range(1000, 2000);
1648 }
1649 
1650 /*
1651  * snd_usb_interface_dsd_format_quirks() is called from format.c to
1652  * augment the PCM format bit-field for DSD types. The UAC standards
1653  * don't have a designated bit field to denote DSD-capable interfaces,
1654  * hence all hardware that is known to support this format has to be
1655  * listed here.
1656  */
1657 u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
1658 					struct audioformat *fp,
1659 					unsigned int sample_bytes)
1660 {
1661 	struct usb_interface *iface;
1662 
1663 	/* Playback Designs */
1664 	if (USB_ID_VENDOR(chip->usb_id) == 0x23ba &&
1665 	    USB_ID_PRODUCT(chip->usb_id) < 0x0110) {
1666 		switch (fp->altsetting) {
1667 		case 1:
1668 			fp->dsd_dop = true;
1669 			return SNDRV_PCM_FMTBIT_DSD_U16_LE;
1670 		case 2:
1671 			fp->dsd_bitrev = true;
1672 			return SNDRV_PCM_FMTBIT_DSD_U8;
1673 		case 3:
1674 			fp->dsd_bitrev = true;
1675 			return SNDRV_PCM_FMTBIT_DSD_U16_LE;
1676 		}
1677 	}
1678 
1679 	/* XMOS based USB DACs */
1680 	switch (chip->usb_id) {
1681 	case USB_ID(0x1511, 0x0037): /* AURALiC VEGA */
1682 	case USB_ID(0x2522, 0x0012): /* LH Labs VI DAC Infinity */
1683 	case USB_ID(0x2772, 0x0230): /* Pro-Ject Pre Box S2 Digital */
1684 		if (fp->altsetting == 2)
1685 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1686 		break;
1687 
1688 	case USB_ID(0x0d8c, 0x0316): /* Hegel HD12 DSD */
1689 	case USB_ID(0x10cb, 0x0103): /* The Bit Opus #3; with fp->dsd_raw */
1690 	case USB_ID(0x16b0, 0x06b2): /* NuPrime DAC-10 */
1691 	case USB_ID(0x16d0, 0x09dd): /* Encore mDSD */
1692 	case USB_ID(0x16d0, 0x0733): /* Furutech ADL Stratos */
1693 	case USB_ID(0x16d0, 0x09db): /* NuPrime Audio DAC-9 */
1694 	case USB_ID(0x1db5, 0x0003): /* Bryston BDA3 */
1695 	case USB_ID(0x22e1, 0xca01): /* HDTA Serenade DSD */
1696 	case USB_ID(0x249c, 0x9326): /* M2Tech Young MkIII */
1697 	case USB_ID(0x2616, 0x0106): /* PS Audio NuWave DAC */
1698 	case USB_ID(0x2622, 0x0041): /* Audiolab M-DAC+ */
1699 	case USB_ID(0x27f7, 0x3002): /* W4S DAC-2v2SE */
1700 	case USB_ID(0x29a2, 0x0086): /* Mutec MC3+ USB */
1701 	case USB_ID(0x6b42, 0x0042): /* MSB Technology */
1702 		if (fp->altsetting == 3)
1703 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1704 		break;
1705 
1706 	/* Amanero Combo384 USB based DACs with native DSD support */
1707 	case USB_ID(0x16d0, 0x071a):  /* Amanero - Combo384 */
1708 	case USB_ID(0x2ab6, 0x0004):  /* T+A DAC8DSD-V2.0, MP1000E-V2.0, MP2000R-V2.0, MP2500R-V2.0, MP3100HV-V2.0 */
1709 	case USB_ID(0x2ab6, 0x0005):  /* T+A USB HD Audio 1 */
1710 	case USB_ID(0x2ab6, 0x0006):  /* T+A USB HD Audio 2 */
1711 		if (fp->altsetting == 2) {
1712 			switch (le16_to_cpu(chip->dev->descriptor.bcdDevice)) {
1713 			case 0x199:
1714 				return SNDRV_PCM_FMTBIT_DSD_U32_LE;
1715 			case 0x19b:
1716 			case 0x203:
1717 				return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1718 			default:
1719 				break;
1720 			}
1721 		}
1722 		break;
1723 	case USB_ID(0x16d0, 0x0a23):
1724 		if (fp->altsetting == 2)
1725 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1726 		break;
1727 
1728 	default:
1729 		break;
1730 	}
1731 
1732 	/* ITF-USB DSD based DACs */
1733 	if (is_itf_usb_dsd_dac(chip->usb_id)) {
1734 		iface = usb_ifnum_to_if(chip->dev, fp->iface);
1735 
1736 		/* Altsetting 2 support native DSD if the num of altsets is
1737 		 * three (0-2),
1738 		 * Altsetting 3 support native DSD if the num of altsets is
1739 		 * four (0-3).
1740 		 */
1741 		if (fp->altsetting == iface->num_altsetting - 1)
1742 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1743 	}
1744 
1745 	/* Mostly generic method to detect many DSD-capable implementations -
1746 	 * from XMOS/Thesycon
1747 	 */
1748 	switch (USB_ID_VENDOR(chip->usb_id)) {
1749 	case 0x152a:  /* Thesycon devices */
1750 	case 0x20b1:  /* XMOS based devices */
1751 	case 0x22d9:  /* Oppo */
1752 	case 0x23ba:  /* Playback Designs */
1753 	case 0x25ce:  /* Mytek devices */
1754 	case 0x278b:  /* Rotel? */
1755 	case 0x292b:  /* Gustard/Ess based devices */
1756 	case 0x2ab6:  /* T+A devices */
1757 	case 0x3842:  /* EVGA */
1758 	case 0xc502:  /* HiBy devices */
1759 		if (fp->dsd_raw)
1760 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1761 		break;
1762 	default:
1763 		break;
1764 
1765 	}
1766 
1767 	return 0;
1768 }
1769 
1770 void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
1771 					  struct audioformat *fp,
1772 					  int stream)
1773 {
1774 	switch (chip->usb_id) {
1775 	case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
1776 		/* Optoplay sets the sample rate attribute although
1777 		 * it seems not supporting it in fact.
1778 		 */
1779 		fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
1780 		break;
1781 	case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
1782 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
1783 		/* doesn't set the sample rate attribute, but supports it */
1784 		fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
1785 		break;
1786 	case USB_ID(0x0763, 0x2001):  /* M-Audio Quattro USB */
1787 	case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
1788 	case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
1789 	case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
1790 					an older model 77d:223) */
1791 	/*
1792 	 * plantronics headset and Griffin iMic have set adaptive-in
1793 	 * although it's really not...
1794 	 */
1795 		fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
1796 		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1797 			fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
1798 		else
1799 			fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
1800 		break;
1801 	case USB_ID(0x07fd, 0x0004):  /* MOTU MicroBook IIc */
1802 		/*
1803 		 * MaxPacketsOnly attribute is erroneously set in endpoint
1804 		 * descriptors. As a result this card produces noise with
1805 		 * all sample rates other than 96 KHz.
1806 		 */
1807 		fp->attributes &= ~UAC_EP_CS_ATTR_FILL_MAX;
1808 		break;
1809 	}
1810 }
1811 
1812 /*
1813  * registration quirk:
1814  * the registration is skipped if a device matches with the given ID,
1815  * unless the interface reaches to the defined one.  This is for delaying
1816  * the registration until the last known interface, so that the card and
1817  * devices appear at the same time.
1818  */
1819 
1820 struct registration_quirk {
1821 	unsigned int usb_id;	/* composed via USB_ID() */
1822 	unsigned int interface;	/* the interface to trigger register */
1823 };
1824 
1825 #define REG_QUIRK_ENTRY(vendor, product, iface) \
1826 	{ .usb_id = USB_ID(vendor, product), .interface = (iface) }
1827 
1828 static const struct registration_quirk registration_quirks[] = {
1829 	REG_QUIRK_ENTRY(0x0951, 0x16d8, 2),	/* Kingston HyperX AMP */
1830 	REG_QUIRK_ENTRY(0x0951, 0x16ed, 2),	/* Kingston HyperX Cloud Alpha S */
1831 	{ 0 }					/* terminator */
1832 };
1833 
1834 /* return true if skipping registration */
1835 bool snd_usb_registration_quirk(struct snd_usb_audio *chip, int iface)
1836 {
1837 	const struct registration_quirk *q;
1838 
1839 	for (q = registration_quirks; q->usb_id; q++)
1840 		if (chip->usb_id == q->usb_id)
1841 			return iface != q->interface;
1842 
1843 	/* Register as normal */
1844 	return false;
1845 }
1846