xref: /openbmc/linux/sound/usb/quirks.c (revision c000c4f1)
1 /*
2  *   This program is free software; you can redistribute it and/or modify
3  *   it under the terms of the GNU General Public License as published by
4  *   the Free Software Foundation; either version 2 of the License, or
5  *   (at your option) any later version.
6  *
7  *   This program is distributed in the hope that it will be useful,
8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  *   GNU General Public License for more details.
11  *
12  *   You should have received a copy of the GNU General Public License
13  *   along with this program; if not, write to the Free Software
14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
15  */
16 
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/usb.h>
20 #include <linux/usb/audio.h>
21 #include <linux/usb/midi.h>
22 
23 #include <sound/control.h>
24 #include <sound/core.h>
25 #include <sound/info.h>
26 #include <sound/pcm.h>
27 
28 #include "usbaudio.h"
29 #include "card.h"
30 #include "mixer.h"
31 #include "mixer_quirks.h"
32 #include "midi.h"
33 #include "quirks.h"
34 #include "helper.h"
35 #include "endpoint.h"
36 #include "pcm.h"
37 #include "clock.h"
38 #include "stream.h"
39 
40 /*
41  * handle the quirks for the contained interfaces
42  */
43 static int create_composite_quirk(struct snd_usb_audio *chip,
44 				  struct usb_interface *iface,
45 				  struct usb_driver *driver,
46 				  const struct snd_usb_audio_quirk *quirk_comp)
47 {
48 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
49 	const struct snd_usb_audio_quirk *quirk;
50 	int err;
51 
52 	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
53 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
54 		if (!iface)
55 			continue;
56 		if (quirk->ifnum != probed_ifnum &&
57 		    usb_interface_claimed(iface))
58 			continue;
59 		err = snd_usb_create_quirk(chip, iface, driver, quirk);
60 		if (err < 0)
61 			return err;
62 	}
63 
64 	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
65 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
66 		if (!iface)
67 			continue;
68 		if (quirk->ifnum != probed_ifnum &&
69 		    !usb_interface_claimed(iface))
70 			usb_driver_claim_interface(driver, iface, (void *)-1L);
71 	}
72 
73 	return 0;
74 }
75 
76 static int ignore_interface_quirk(struct snd_usb_audio *chip,
77 				  struct usb_interface *iface,
78 				  struct usb_driver *driver,
79 				  const struct snd_usb_audio_quirk *quirk)
80 {
81 	return 0;
82 }
83 
84 
85 /*
86  * Allow alignment on audio sub-slot (channel samples) rather than
87  * on audio slots (audio frames)
88  */
89 static int create_align_transfer_quirk(struct snd_usb_audio *chip,
90 				       struct usb_interface *iface,
91 				       struct usb_driver *driver,
92 				       const struct snd_usb_audio_quirk *quirk)
93 {
94 	chip->txfr_quirk = 1;
95 	return 1;	/* Continue with creating streams and mixer */
96 }
97 
98 static int create_any_midi_quirk(struct snd_usb_audio *chip,
99 				 struct usb_interface *intf,
100 				 struct usb_driver *driver,
101 				 const struct snd_usb_audio_quirk *quirk)
102 {
103 	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
104 }
105 
106 /*
107  * create a stream for an interface with proper descriptors
108  */
109 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
110 				       struct usb_interface *iface,
111 				       struct usb_driver *driver,
112 				       const struct snd_usb_audio_quirk *quirk)
113 {
114 	struct usb_host_interface *alts;
115 	struct usb_interface_descriptor *altsd;
116 	int err;
117 
118 	if (chip->usb_id == USB_ID(0x1686, 0x00dd)) /* Zoom R16/24 */
119 		chip->tx_length_quirk = 1;
120 
121 	alts = &iface->altsetting[0];
122 	altsd = get_iface_desc(alts);
123 	err = snd_usb_parse_audio_interface(chip, altsd->bInterfaceNumber);
124 	if (err < 0) {
125 		usb_audio_err(chip, "cannot setup if %d: error %d\n",
126 			   altsd->bInterfaceNumber, err);
127 		return err;
128 	}
129 	/* reset the current interface */
130 	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
131 	return 0;
132 }
133 
134 /*
135  * create a stream for an endpoint/altsetting without proper descriptors
136  */
137 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
138 				     struct usb_interface *iface,
139 				     struct usb_driver *driver,
140 				     const struct snd_usb_audio_quirk *quirk)
141 {
142 	struct audioformat *fp;
143 	struct usb_host_interface *alts;
144 	struct usb_interface_descriptor *altsd;
145 	int stream, err;
146 	unsigned *rate_table = NULL;
147 
148 	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
149 	if (!fp)
150 		return -ENOMEM;
151 
152 	INIT_LIST_HEAD(&fp->list);
153 	if (fp->nr_rates > MAX_NR_RATES) {
154 		kfree(fp);
155 		return -EINVAL;
156 	}
157 	if (fp->nr_rates > 0) {
158 		rate_table = kmemdup(fp->rate_table,
159 				     sizeof(int) * fp->nr_rates, GFP_KERNEL);
160 		if (!rate_table) {
161 			kfree(fp);
162 			return -ENOMEM;
163 		}
164 		fp->rate_table = rate_table;
165 	}
166 
167 	stream = (fp->endpoint & USB_DIR_IN)
168 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
169 	err = snd_usb_add_audio_stream(chip, stream, fp);
170 	if (err < 0)
171 		goto error;
172 	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
173 	    fp->altset_idx >= iface->num_altsetting) {
174 		err = -EINVAL;
175 		goto error;
176 	}
177 	alts = &iface->altsetting[fp->altset_idx];
178 	altsd = get_iface_desc(alts);
179 	if (altsd->bNumEndpoints < 1) {
180 		err = -EINVAL;
181 		goto error;
182 	}
183 
184 	fp->protocol = altsd->bInterfaceProtocol;
185 
186 	if (fp->datainterval == 0)
187 		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
188 	if (fp->maxpacksize == 0)
189 		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
190 	usb_set_interface(chip->dev, fp->iface, 0);
191 	snd_usb_init_pitch(chip, fp->iface, alts, fp);
192 	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
193 	return 0;
194 
195  error:
196 	list_del(&fp->list); /* unlink for avoiding double-free */
197 	kfree(fp);
198 	kfree(rate_table);
199 	return err;
200 }
201 
202 static int create_auto_pcm_quirk(struct snd_usb_audio *chip,
203 				 struct usb_interface *iface,
204 				 struct usb_driver *driver)
205 {
206 	struct usb_host_interface *alts;
207 	struct usb_interface_descriptor *altsd;
208 	struct usb_endpoint_descriptor *epd;
209 	struct uac1_as_header_descriptor *ashd;
210 	struct uac_format_type_i_discrete_descriptor *fmtd;
211 
212 	/*
213 	 * Most Roland/Yamaha audio streaming interfaces have more or less
214 	 * standard descriptors, but older devices might lack descriptors, and
215 	 * future ones might change, so ensure that we fail silently if the
216 	 * interface doesn't look exactly right.
217 	 */
218 
219 	/* must have a non-zero altsetting for streaming */
220 	if (iface->num_altsetting < 2)
221 		return -ENODEV;
222 	alts = &iface->altsetting[1];
223 	altsd = get_iface_desc(alts);
224 
225 	/* must have an isochronous endpoint for streaming */
226 	if (altsd->bNumEndpoints < 1)
227 		return -ENODEV;
228 	epd = get_endpoint(alts, 0);
229 	if (!usb_endpoint_xfer_isoc(epd))
230 		return -ENODEV;
231 
232 	/* must have format descriptors */
233 	ashd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
234 				       UAC_AS_GENERAL);
235 	fmtd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
236 				       UAC_FORMAT_TYPE);
237 	if (!ashd || ashd->bLength < 7 ||
238 	    !fmtd || fmtd->bLength < 8)
239 		return -ENODEV;
240 
241 	return create_standard_audio_quirk(chip, iface, driver, NULL);
242 }
243 
244 static int create_yamaha_midi_quirk(struct snd_usb_audio *chip,
245 				    struct usb_interface *iface,
246 				    struct usb_driver *driver,
247 				    struct usb_host_interface *alts)
248 {
249 	static const struct snd_usb_audio_quirk yamaha_midi_quirk = {
250 		.type = QUIRK_MIDI_YAMAHA
251 	};
252 	struct usb_midi_in_jack_descriptor *injd;
253 	struct usb_midi_out_jack_descriptor *outjd;
254 
255 	/* must have some valid jack descriptors */
256 	injd = snd_usb_find_csint_desc(alts->extra, alts->extralen,
257 				       NULL, USB_MS_MIDI_IN_JACK);
258 	outjd = snd_usb_find_csint_desc(alts->extra, alts->extralen,
259 					NULL, USB_MS_MIDI_OUT_JACK);
260 	if (!injd && !outjd)
261 		return -ENODEV;
262 	if (injd && (injd->bLength < 5 ||
263 		     (injd->bJackType != USB_MS_EMBEDDED &&
264 		      injd->bJackType != USB_MS_EXTERNAL)))
265 		return -ENODEV;
266 	if (outjd && (outjd->bLength < 6 ||
267 		      (outjd->bJackType != USB_MS_EMBEDDED &&
268 		       outjd->bJackType != USB_MS_EXTERNAL)))
269 		return -ENODEV;
270 	return create_any_midi_quirk(chip, iface, driver, &yamaha_midi_quirk);
271 }
272 
273 static int create_roland_midi_quirk(struct snd_usb_audio *chip,
274 				    struct usb_interface *iface,
275 				    struct usb_driver *driver,
276 				    struct usb_host_interface *alts)
277 {
278 	static const struct snd_usb_audio_quirk roland_midi_quirk = {
279 		.type = QUIRK_MIDI_ROLAND
280 	};
281 	u8 *roland_desc = NULL;
282 
283 	/* might have a vendor-specific descriptor <06 24 F1 02 ...> */
284 	for (;;) {
285 		roland_desc = snd_usb_find_csint_desc(alts->extra,
286 						      alts->extralen,
287 						      roland_desc, 0xf1);
288 		if (!roland_desc)
289 			return -ENODEV;
290 		if (roland_desc[0] < 6 || roland_desc[3] != 2)
291 			continue;
292 		return create_any_midi_quirk(chip, iface, driver,
293 					     &roland_midi_quirk);
294 	}
295 }
296 
297 static int create_std_midi_quirk(struct snd_usb_audio *chip,
298 				 struct usb_interface *iface,
299 				 struct usb_driver *driver,
300 				 struct usb_host_interface *alts)
301 {
302 	struct usb_ms_header_descriptor *mshd;
303 	struct usb_ms_endpoint_descriptor *msepd;
304 
305 	/* must have the MIDIStreaming interface header descriptor*/
306 	mshd = (struct usb_ms_header_descriptor *)alts->extra;
307 	if (alts->extralen < 7 ||
308 	    mshd->bLength < 7 ||
309 	    mshd->bDescriptorType != USB_DT_CS_INTERFACE ||
310 	    mshd->bDescriptorSubtype != USB_MS_HEADER)
311 		return -ENODEV;
312 	/* must have the MIDIStreaming endpoint descriptor*/
313 	msepd = (struct usb_ms_endpoint_descriptor *)alts->endpoint[0].extra;
314 	if (alts->endpoint[0].extralen < 4 ||
315 	    msepd->bLength < 4 ||
316 	    msepd->bDescriptorType != USB_DT_CS_ENDPOINT ||
317 	    msepd->bDescriptorSubtype != UAC_MS_GENERAL ||
318 	    msepd->bNumEmbMIDIJack < 1 ||
319 	    msepd->bNumEmbMIDIJack > 16)
320 		return -ENODEV;
321 
322 	return create_any_midi_quirk(chip, iface, driver, NULL);
323 }
324 
325 static int create_auto_midi_quirk(struct snd_usb_audio *chip,
326 				  struct usb_interface *iface,
327 				  struct usb_driver *driver)
328 {
329 	struct usb_host_interface *alts;
330 	struct usb_interface_descriptor *altsd;
331 	struct usb_endpoint_descriptor *epd;
332 	int err;
333 
334 	alts = &iface->altsetting[0];
335 	altsd = get_iface_desc(alts);
336 
337 	/* must have at least one bulk/interrupt endpoint for streaming */
338 	if (altsd->bNumEndpoints < 1)
339 		return -ENODEV;
340 	epd = get_endpoint(alts, 0);
341 	if (!usb_endpoint_xfer_bulk(epd) &&
342 	    !usb_endpoint_xfer_int(epd))
343 		return -ENODEV;
344 
345 	switch (USB_ID_VENDOR(chip->usb_id)) {
346 	case 0x0499: /* Yamaha */
347 		err = create_yamaha_midi_quirk(chip, iface, driver, alts);
348 		if (err != -ENODEV)
349 			return err;
350 		break;
351 	case 0x0582: /* Roland */
352 		err = create_roland_midi_quirk(chip, iface, driver, alts);
353 		if (err != -ENODEV)
354 			return err;
355 		break;
356 	}
357 
358 	return create_std_midi_quirk(chip, iface, driver, alts);
359 }
360 
361 static int create_autodetect_quirk(struct snd_usb_audio *chip,
362 				   struct usb_interface *iface,
363 				   struct usb_driver *driver)
364 {
365 	int err;
366 
367 	err = create_auto_pcm_quirk(chip, iface, driver);
368 	if (err == -ENODEV)
369 		err = create_auto_midi_quirk(chip, iface, driver);
370 	return err;
371 }
372 
373 static int create_autodetect_quirks(struct snd_usb_audio *chip,
374 				    struct usb_interface *iface,
375 				    struct usb_driver *driver,
376 				    const struct snd_usb_audio_quirk *quirk)
377 {
378 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
379 	int ifcount, ifnum, err;
380 
381 	err = create_autodetect_quirk(chip, iface, driver);
382 	if (err < 0)
383 		return err;
384 
385 	/*
386 	 * ALSA PCM playback/capture devices cannot be registered in two steps,
387 	 * so we have to claim the other corresponding interface here.
388 	 */
389 	ifcount = chip->dev->actconfig->desc.bNumInterfaces;
390 	for (ifnum = 0; ifnum < ifcount; ifnum++) {
391 		if (ifnum == probed_ifnum || quirk->ifnum >= 0)
392 			continue;
393 		iface = usb_ifnum_to_if(chip->dev, ifnum);
394 		if (!iface ||
395 		    usb_interface_claimed(iface) ||
396 		    get_iface_desc(iface->altsetting)->bInterfaceClass !=
397 							USB_CLASS_VENDOR_SPEC)
398 			continue;
399 
400 		err = create_autodetect_quirk(chip, iface, driver);
401 		if (err >= 0)
402 			usb_driver_claim_interface(driver, iface, (void *)-1L);
403 	}
404 
405 	return 0;
406 }
407 
408 /*
409  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
410  * The only way to detect the sample rate is by looking at wMaxPacketSize.
411  */
412 static int create_uaxx_quirk(struct snd_usb_audio *chip,
413 			     struct usb_interface *iface,
414 			     struct usb_driver *driver,
415 			     const struct snd_usb_audio_quirk *quirk)
416 {
417 	static const struct audioformat ua_format = {
418 		.formats = SNDRV_PCM_FMTBIT_S24_3LE,
419 		.channels = 2,
420 		.fmt_type = UAC_FORMAT_TYPE_I,
421 		.altsetting = 1,
422 		.altset_idx = 1,
423 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
424 	};
425 	struct usb_host_interface *alts;
426 	struct usb_interface_descriptor *altsd;
427 	struct audioformat *fp;
428 	int stream, err;
429 
430 	/* both PCM and MIDI interfaces have 2 or more altsettings */
431 	if (iface->num_altsetting < 2)
432 		return -ENXIO;
433 	alts = &iface->altsetting[1];
434 	altsd = get_iface_desc(alts);
435 
436 	if (altsd->bNumEndpoints == 2) {
437 		static const struct snd_usb_midi_endpoint_info ua700_ep = {
438 			.out_cables = 0x0003,
439 			.in_cables  = 0x0003
440 		};
441 		static const struct snd_usb_audio_quirk ua700_quirk = {
442 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
443 			.data = &ua700_ep
444 		};
445 		static const struct snd_usb_midi_endpoint_info uaxx_ep = {
446 			.out_cables = 0x0001,
447 			.in_cables  = 0x0001
448 		};
449 		static const struct snd_usb_audio_quirk uaxx_quirk = {
450 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
451 			.data = &uaxx_ep
452 		};
453 		const struct snd_usb_audio_quirk *quirk =
454 			chip->usb_id == USB_ID(0x0582, 0x002b)
455 			? &ua700_quirk : &uaxx_quirk;
456 		return __snd_usbmidi_create(chip->card, iface,
457 					  &chip->midi_list, quirk,
458 					  chip->usb_id);
459 	}
460 
461 	if (altsd->bNumEndpoints != 1)
462 		return -ENXIO;
463 
464 	fp = kmemdup(&ua_format, sizeof(*fp), GFP_KERNEL);
465 	if (!fp)
466 		return -ENOMEM;
467 
468 	fp->iface = altsd->bInterfaceNumber;
469 	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
470 	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
471 	fp->datainterval = 0;
472 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
473 	INIT_LIST_HEAD(&fp->list);
474 
475 	switch (fp->maxpacksize) {
476 	case 0x120:
477 		fp->rate_max = fp->rate_min = 44100;
478 		break;
479 	case 0x138:
480 	case 0x140:
481 		fp->rate_max = fp->rate_min = 48000;
482 		break;
483 	case 0x258:
484 	case 0x260:
485 		fp->rate_max = fp->rate_min = 96000;
486 		break;
487 	default:
488 		usb_audio_err(chip, "unknown sample rate\n");
489 		kfree(fp);
490 		return -ENXIO;
491 	}
492 
493 	stream = (fp->endpoint & USB_DIR_IN)
494 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
495 	err = snd_usb_add_audio_stream(chip, stream, fp);
496 	if (err < 0) {
497 		list_del(&fp->list); /* unlink for avoiding double-free */
498 		kfree(fp);
499 		return err;
500 	}
501 	usb_set_interface(chip->dev, fp->iface, 0);
502 	return 0;
503 }
504 
505 /*
506  * Create a standard mixer for the specified interface.
507  */
508 static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
509 				       struct usb_interface *iface,
510 				       struct usb_driver *driver,
511 				       const struct snd_usb_audio_quirk *quirk)
512 {
513 	if (quirk->ifnum < 0)
514 		return 0;
515 
516 	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
517 }
518 
519 /*
520  * audio-interface quirks
521  *
522  * returns zero if no standard audio/MIDI parsing is needed.
523  * returns a positive value if standard audio/midi interfaces are parsed
524  * after this.
525  * returns a negative value at error.
526  */
527 int snd_usb_create_quirk(struct snd_usb_audio *chip,
528 			 struct usb_interface *iface,
529 			 struct usb_driver *driver,
530 			 const struct snd_usb_audio_quirk *quirk)
531 {
532 	typedef int (*quirk_func_t)(struct snd_usb_audio *,
533 				    struct usb_interface *,
534 				    struct usb_driver *,
535 				    const struct snd_usb_audio_quirk *);
536 	static const quirk_func_t quirk_funcs[] = {
537 		[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
538 		[QUIRK_COMPOSITE] = create_composite_quirk,
539 		[QUIRK_AUTODETECT] = create_autodetect_quirks,
540 		[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
541 		[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
542 		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
543 		[QUIRK_MIDI_ROLAND] = create_any_midi_quirk,
544 		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
545 		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
546 		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
547 		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
548 		[QUIRK_MIDI_CME] = create_any_midi_quirk,
549 		[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
550 		[QUIRK_MIDI_FTDI] = create_any_midi_quirk,
551 		[QUIRK_MIDI_CH345] = create_any_midi_quirk,
552 		[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
553 		[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
554 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
555 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
556 		[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
557 	};
558 
559 	if (quirk->type < QUIRK_TYPE_COUNT) {
560 		return quirk_funcs[quirk->type](chip, iface, driver, quirk);
561 	} else {
562 		usb_audio_err(chip, "invalid quirk type %d\n", quirk->type);
563 		return -ENXIO;
564 	}
565 }
566 
567 /*
568  * boot quirks
569  */
570 
571 #define EXTIGY_FIRMWARE_SIZE_OLD 794
572 #define EXTIGY_FIRMWARE_SIZE_NEW 483
573 
574 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
575 {
576 	struct usb_host_config *config = dev->actconfig;
577 	int err;
578 
579 	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
580 	    le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
581 		dev_dbg(&dev->dev, "sending Extigy boot sequence...\n");
582 		/* Send message to force it to reconnect with full interface. */
583 		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
584 				      0x10, 0x43, 0x0001, 0x000a, NULL, 0);
585 		if (err < 0)
586 			dev_dbg(&dev->dev, "error sending boot message: %d\n", err);
587 		err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
588 				&dev->descriptor, sizeof(dev->descriptor));
589 		config = dev->actconfig;
590 		if (err < 0)
591 			dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
592 		err = usb_reset_configuration(dev);
593 		if (err < 0)
594 			dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
595 		dev_dbg(&dev->dev, "extigy_boot: new boot length = %d\n",
596 			    le16_to_cpu(get_cfg_desc(config)->wTotalLength));
597 		return -ENODEV; /* quit this anyway */
598 	}
599 	return 0;
600 }
601 
602 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
603 {
604 	u8 buf = 1;
605 
606 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
607 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
608 			0, 0, &buf, 1);
609 	if (buf == 0) {
610 		snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
611 				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
612 				1, 2000, NULL, 0);
613 		return -ENODEV;
614 	}
615 	return 0;
616 }
617 
618 static int snd_usb_fasttrackpro_boot_quirk(struct usb_device *dev)
619 {
620 	int err;
621 
622 	if (dev->actconfig->desc.bConfigurationValue == 1) {
623 		dev_info(&dev->dev,
624 			   "Fast Track Pro switching to config #2\n");
625 		/* This function has to be available by the usb core module.
626 		 * if it is not avialable the boot quirk has to be left out
627 		 * and the configuration has to be set by udev or hotplug
628 		 * rules
629 		 */
630 		err = usb_driver_set_configuration(dev, 2);
631 		if (err < 0)
632 			dev_dbg(&dev->dev,
633 				"error usb_driver_set_configuration: %d\n",
634 				err);
635 		/* Always return an error, so that we stop creating a device
636 		   that will just be destroyed and recreated with a new
637 		   configuration */
638 		return -ENODEV;
639 	} else
640 		dev_info(&dev->dev, "Fast Track Pro config OK\n");
641 
642 	return 0;
643 }
644 
645 /*
646  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
647  * documented in the device's data sheet.
648  */
649 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
650 {
651 	u8 buf[4];
652 	buf[0] = 0x20;
653 	buf[1] = value & 0xff;
654 	buf[2] = (value >> 8) & 0xff;
655 	buf[3] = reg;
656 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
657 			       USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
658 			       0, 0, &buf, 4);
659 }
660 
661 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
662 {
663 	/*
664 	 * Enable line-out driver mode, set headphone source to front
665 	 * channels, enable stereo mic.
666 	 */
667 	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
668 }
669 
670 /*
671  * C-Media CM6206 is based on CM106 with two additional
672  * registers that are not documented in the data sheet.
673  * Values here are chosen based on sniffing USB traffic
674  * under Windows.
675  */
676 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
677 {
678 	int err  = 0, reg;
679 	int val[] = {0x2004, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
680 
681 	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
682 		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
683 		if (err < 0)
684 			return err;
685 	}
686 
687 	return err;
688 }
689 
690 /* quirk for Plantronics GameCom 780 with CM6302 chip */
691 static int snd_usb_gamecon780_boot_quirk(struct usb_device *dev)
692 {
693 	/* set the initial volume and don't change; other values are either
694 	 * too loud or silent due to firmware bug (bko#65251)
695 	 */
696 	u8 buf[2] = { 0x74, 0xe3 };
697 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
698 			USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
699 			UAC_FU_VOLUME << 8, 9 << 8, buf, 2);
700 }
701 
702 /*
703  * Novation Twitch DJ controller
704  * Focusrite Novation Saffire 6 USB audio card
705  */
706 static int snd_usb_novation_boot_quirk(struct usb_device *dev)
707 {
708 	/* preemptively set up the device because otherwise the
709 	 * raw MIDI endpoints are not active */
710 	usb_set_interface(dev, 0, 1);
711 	return 0;
712 }
713 
714 /*
715  * This call will put the synth in "USB send" mode, i.e it will send MIDI
716  * messages through USB (this is disabled at startup). The synth will
717  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
718  * sign on its LCD. Values here are chosen based on sniffing USB traffic
719  * under Windows.
720  */
721 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
722 {
723 	int err, actual_length;
724 
725 	/* "midi send" enable */
726 	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
727 
728 	void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
729 	if (!buf)
730 		return -ENOMEM;
731 	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
732 			ARRAY_SIZE(seq), &actual_length, 1000);
733 	kfree(buf);
734 	if (err < 0)
735 		return err;
736 
737 	return 0;
738 }
739 
740 /*
741  * Some sound cards from Native Instruments are in fact compliant to the USB
742  * audio standard of version 2 and other approved USB standards, even though
743  * they come up as vendor-specific device when first connected.
744  *
745  * However, they can be told to come up with a new set of descriptors
746  * upon their next enumeration, and the interfaces announced by the new
747  * descriptors will then be handled by the kernel's class drivers. As the
748  * product ID will also change, no further checks are required.
749  */
750 
751 static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
752 {
753 	int ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
754 				  0xaf, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
755 				  1, 0, NULL, 0, 1000);
756 
757 	if (ret < 0)
758 		return ret;
759 
760 	usb_reset_device(dev);
761 
762 	/* return -EAGAIN, so the creation of an audio interface for this
763 	 * temporary device is aborted. The device will reconnect with a
764 	 * new product ID */
765 	return -EAGAIN;
766 }
767 
768 static void mbox2_setup_48_24_magic(struct usb_device *dev)
769 {
770 	u8 srate[3];
771 	u8 temp[12];
772 
773 	/* Choose 48000Hz permanently */
774 	srate[0] = 0x80;
775 	srate[1] = 0xbb;
776 	srate[2] = 0x00;
777 
778 	/* Send the magic! */
779 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
780 		0x01, 0x22, 0x0100, 0x0085, &temp, 0x0003);
781 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
782 		0x81, 0xa2, 0x0100, 0x0085, &srate, 0x0003);
783 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
784 		0x81, 0xa2, 0x0100, 0x0086, &srate, 0x0003);
785 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
786 		0x81, 0xa2, 0x0100, 0x0003, &srate, 0x0003);
787 	return;
788 }
789 
790 /* Digidesign Mbox 2 needs to load firmware onboard
791  * and driver must wait a few seconds for initialisation.
792  */
793 
794 #define MBOX2_FIRMWARE_SIZE    646
795 #define MBOX2_BOOT_LOADING     0x01 /* Hard coded into the device */
796 #define MBOX2_BOOT_READY       0x02 /* Hard coded into the device */
797 
798 static int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
799 {
800 	struct usb_host_config *config = dev->actconfig;
801 	int err;
802 	u8 bootresponse[0x12];
803 	int fwsize;
804 	int count;
805 
806 	fwsize = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
807 
808 	if (fwsize != MBOX2_FIRMWARE_SIZE) {
809 		dev_err(&dev->dev, "Invalid firmware size=%d.\n", fwsize);
810 		return -ENODEV;
811 	}
812 
813 	dev_dbg(&dev->dev, "Sending Digidesign Mbox 2 boot sequence...\n");
814 
815 	count = 0;
816 	bootresponse[0] = MBOX2_BOOT_LOADING;
817 	while ((bootresponse[0] == MBOX2_BOOT_LOADING) && (count < 10)) {
818 		msleep(500); /* 0.5 second delay */
819 		snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
820 			/* Control magic - load onboard firmware */
821 			0x85, 0xc0, 0x0001, 0x0000, &bootresponse, 0x0012);
822 		if (bootresponse[0] == MBOX2_BOOT_READY)
823 			break;
824 		dev_dbg(&dev->dev, "device not ready, resending boot sequence...\n");
825 		count++;
826 	}
827 
828 	if (bootresponse[0] != MBOX2_BOOT_READY) {
829 		dev_err(&dev->dev, "Unknown bootresponse=%d, or timed out, ignoring device.\n", bootresponse[0]);
830 		return -ENODEV;
831 	}
832 
833 	dev_dbg(&dev->dev, "device initialised!\n");
834 
835 	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
836 		&dev->descriptor, sizeof(dev->descriptor));
837 	config = dev->actconfig;
838 	if (err < 0)
839 		dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
840 
841 	err = usb_reset_configuration(dev);
842 	if (err < 0)
843 		dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
844 	dev_dbg(&dev->dev, "mbox2_boot: new boot length = %d\n",
845 		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
846 
847 	mbox2_setup_48_24_magic(dev);
848 
849 	dev_info(&dev->dev, "Digidesign Mbox 2: 24bit 48kHz");
850 
851 	return 0; /* Successful boot */
852 }
853 
854 static int snd_usb_axefx3_boot_quirk(struct usb_device *dev)
855 {
856 	int err;
857 
858 	dev_dbg(&dev->dev, "Waiting for Axe-Fx III to boot up...\n");
859 
860 	/* If the Axe-Fx III has not fully booted, it will timeout when trying
861 	 * to enable the audio streaming interface. A more generous timeout is
862 	 * used here to detect when the Axe-Fx III has finished booting as the
863 	 * set interface message will be acked once it has
864 	 */
865 	err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
866 				USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
867 				1, 1, NULL, 0, 120000);
868 	if (err < 0) {
869 		dev_err(&dev->dev,
870 			"failed waiting for Axe-Fx III to boot: %d\n", err);
871 		return err;
872 	}
873 
874 	dev_dbg(&dev->dev, "Axe-Fx III is now ready\n");
875 
876 	err = usb_set_interface(dev, 1, 0);
877 	if (err < 0)
878 		dev_dbg(&dev->dev,
879 			"error stopping Axe-Fx III interface: %d\n", err);
880 
881 	return 0;
882 }
883 
884 /*
885  * Setup quirks
886  */
887 #define MAUDIO_SET		0x01 /* parse device_setup */
888 #define MAUDIO_SET_COMPATIBLE	0x80 /* use only "win-compatible" interfaces */
889 #define MAUDIO_SET_DTS		0x02 /* enable DTS Digital Output */
890 #define MAUDIO_SET_96K		0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
891 #define MAUDIO_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
892 #define MAUDIO_SET_DI		0x10 /* enable Digital Input */
893 #define MAUDIO_SET_MASK		0x1f /* bit mask for setup value */
894 #define MAUDIO_SET_24B_48K_DI	 0x19 /* 24bits+48KHz+Digital Input */
895 #define MAUDIO_SET_24B_48K_NOTDI 0x09 /* 24bits+48KHz+No Digital Input */
896 #define MAUDIO_SET_16B_48K_DI	 0x11 /* 16bits+48KHz+Digital Input */
897 #define MAUDIO_SET_16B_48K_NOTDI 0x01 /* 16bits+48KHz+No Digital Input */
898 
899 static int quattro_skip_setting_quirk(struct snd_usb_audio *chip,
900 				      int iface, int altno)
901 {
902 	/* Reset ALL ifaces to 0 altsetting.
903 	 * Call it for every possible altsetting of every interface.
904 	 */
905 	usb_set_interface(chip->dev, iface, 0);
906 	if (chip->setup & MAUDIO_SET) {
907 		if (chip->setup & MAUDIO_SET_COMPATIBLE) {
908 			if (iface != 1 && iface != 2)
909 				return 1; /* skip all interfaces but 1 and 2 */
910 		} else {
911 			unsigned int mask;
912 			if (iface == 1 || iface == 2)
913 				return 1; /* skip interfaces 1 and 2 */
914 			if ((chip->setup & MAUDIO_SET_96K) && altno != 1)
915 				return 1; /* skip this altsetting */
916 			mask = chip->setup & MAUDIO_SET_MASK;
917 			if (mask == MAUDIO_SET_24B_48K_DI && altno != 2)
918 				return 1; /* skip this altsetting */
919 			if (mask == MAUDIO_SET_24B_48K_NOTDI && altno != 3)
920 				return 1; /* skip this altsetting */
921 			if (mask == MAUDIO_SET_16B_48K_NOTDI && altno != 4)
922 				return 1; /* skip this altsetting */
923 		}
924 	}
925 	usb_audio_dbg(chip,
926 		    "using altsetting %d for interface %d config %d\n",
927 		    altno, iface, chip->setup);
928 	return 0; /* keep this altsetting */
929 }
930 
931 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
932 					 int iface,
933 					 int altno)
934 {
935 	/* Reset ALL ifaces to 0 altsetting.
936 	 * Call it for every possible altsetting of every interface.
937 	 */
938 	usb_set_interface(chip->dev, iface, 0);
939 
940 	if (chip->setup & MAUDIO_SET) {
941 		unsigned int mask;
942 		if ((chip->setup & MAUDIO_SET_DTS) && altno != 6)
943 			return 1; /* skip this altsetting */
944 		if ((chip->setup & MAUDIO_SET_96K) && altno != 1)
945 			return 1; /* skip this altsetting */
946 		mask = chip->setup & MAUDIO_SET_MASK;
947 		if (mask == MAUDIO_SET_24B_48K_DI && altno != 2)
948 			return 1; /* skip this altsetting */
949 		if (mask == MAUDIO_SET_24B_48K_NOTDI && altno != 3)
950 			return 1; /* skip this altsetting */
951 		if (mask == MAUDIO_SET_16B_48K_DI && altno != 4)
952 			return 1; /* skip this altsetting */
953 		if (mask == MAUDIO_SET_16B_48K_NOTDI && altno != 5)
954 			return 1; /* skip this altsetting */
955 	}
956 
957 	return 0; /* keep this altsetting */
958 }
959 
960 static int fasttrackpro_skip_setting_quirk(struct snd_usb_audio *chip,
961 					   int iface, int altno)
962 {
963 	/* Reset ALL ifaces to 0 altsetting.
964 	 * Call it for every possible altsetting of every interface.
965 	 */
966 	usb_set_interface(chip->dev, iface, 0);
967 
968 	/* possible configuration where both inputs and only one output is
969 	 *used is not supported by the current setup
970 	 */
971 	if (chip->setup & (MAUDIO_SET | MAUDIO_SET_24B)) {
972 		if (chip->setup & MAUDIO_SET_96K) {
973 			if (altno != 3 && altno != 6)
974 				return 1;
975 		} else if (chip->setup & MAUDIO_SET_DI) {
976 			if (iface == 4)
977 				return 1; /* no analog input */
978 			if (altno != 2 && altno != 5)
979 				return 1; /* enable only altsets 2 and 5 */
980 		} else {
981 			if (iface == 5)
982 				return 1; /* disable digialt input */
983 			if (altno != 2 && altno != 5)
984 				return 1; /* enalbe only altsets 2 and 5 */
985 		}
986 	} else {
987 		/* keep only 16-Bit mode */
988 		if (altno != 1)
989 			return 1;
990 	}
991 
992 	usb_audio_dbg(chip,
993 		    "using altsetting %d for interface %d config %d\n",
994 		    altno, iface, chip->setup);
995 	return 0; /* keep this altsetting */
996 }
997 
998 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
999 				  int iface,
1000 				  int altno)
1001 {
1002 	/* audiophile usb: skip altsets incompatible with device_setup */
1003 	if (chip->usb_id == USB_ID(0x0763, 0x2003))
1004 		return audiophile_skip_setting_quirk(chip, iface, altno);
1005 	/* quattro usb: skip altsets incompatible with device_setup */
1006 	if (chip->usb_id == USB_ID(0x0763, 0x2001))
1007 		return quattro_skip_setting_quirk(chip, iface, altno);
1008 	/* fasttrackpro usb: skip altsets incompatible with device_setup */
1009 	if (chip->usb_id == USB_ID(0x0763, 0x2012))
1010 		return fasttrackpro_skip_setting_quirk(chip, iface, altno);
1011 
1012 	return 0;
1013 }
1014 
1015 int snd_usb_apply_boot_quirk(struct usb_device *dev,
1016 			     struct usb_interface *intf,
1017 			     const struct snd_usb_audio_quirk *quirk,
1018 			     unsigned int id)
1019 {
1020 	switch (id) {
1021 	case USB_ID(0x041e, 0x3000):
1022 		/* SB Extigy needs special boot-up sequence */
1023 		/* if more models come, this will go to the quirk list. */
1024 		return snd_usb_extigy_boot_quirk(dev, intf);
1025 
1026 	case USB_ID(0x041e, 0x3020):
1027 		/* SB Audigy 2 NX needs its own boot-up magic, too */
1028 		return snd_usb_audigy2nx_boot_quirk(dev);
1029 
1030 	case USB_ID(0x10f5, 0x0200):
1031 		/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
1032 		return snd_usb_cm106_boot_quirk(dev);
1033 
1034 	case USB_ID(0x0d8c, 0x0102):
1035 		/* C-Media CM6206 / CM106-Like Sound Device */
1036 	case USB_ID(0x0ccd, 0x00b1): /* Terratec Aureon 7.1 USB */
1037 		return snd_usb_cm6206_boot_quirk(dev);
1038 
1039 	case USB_ID(0x0dba, 0x3000):
1040 		/* Digidesign Mbox 2 */
1041 		return snd_usb_mbox2_boot_quirk(dev);
1042 
1043 	case USB_ID(0x1235, 0x0010): /* Focusrite Novation Saffire 6 USB */
1044 	case USB_ID(0x1235, 0x0018): /* Focusrite Novation Twitch */
1045 		return snd_usb_novation_boot_quirk(dev);
1046 
1047 	case USB_ID(0x133e, 0x0815):
1048 		/* Access Music VirusTI Desktop */
1049 		return snd_usb_accessmusic_boot_quirk(dev);
1050 
1051 	case USB_ID(0x17cc, 0x1000): /* Komplete Audio 6 */
1052 	case USB_ID(0x17cc, 0x1010): /* Traktor Audio 6 */
1053 	case USB_ID(0x17cc, 0x1020): /* Traktor Audio 10 */
1054 		return snd_usb_nativeinstruments_boot_quirk(dev);
1055 	case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
1056 		return snd_usb_fasttrackpro_boot_quirk(dev);
1057 	case USB_ID(0x047f, 0xc010): /* Plantronics Gamecom 780 */
1058 		return snd_usb_gamecon780_boot_quirk(dev);
1059 	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx 3 */
1060 		return snd_usb_axefx3_boot_quirk(dev);
1061 	}
1062 
1063 	return 0;
1064 }
1065 
1066 /*
1067  * check if the device uses big-endian samples
1068  */
1069 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
1070 {
1071 	/* it depends on altsetting whether the device is big-endian or not */
1072 	switch (chip->usb_id) {
1073 	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
1074 		if (fp->altsetting == 2 || fp->altsetting == 3 ||
1075 			fp->altsetting == 5 || fp->altsetting == 6)
1076 			return 1;
1077 		break;
1078 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
1079 		if (chip->setup == 0x00 ||
1080 			fp->altsetting == 1 || fp->altsetting == 2 ||
1081 			fp->altsetting == 3)
1082 			return 1;
1083 		break;
1084 	case USB_ID(0x0763, 0x2012): /* M-Audio Fast Track Pro */
1085 		if (fp->altsetting == 2 || fp->altsetting == 3 ||
1086 			fp->altsetting == 5 || fp->altsetting == 6)
1087 			return 1;
1088 		break;
1089 	}
1090 	return 0;
1091 }
1092 
1093 /*
1094  * For E-Mu 0404USB/0202USB/TrackerPre/0204 sample rate should be set for device,
1095  * not for interface.
1096  */
1097 
1098 enum {
1099 	EMU_QUIRK_SR_44100HZ = 0,
1100 	EMU_QUIRK_SR_48000HZ,
1101 	EMU_QUIRK_SR_88200HZ,
1102 	EMU_QUIRK_SR_96000HZ,
1103 	EMU_QUIRK_SR_176400HZ,
1104 	EMU_QUIRK_SR_192000HZ
1105 };
1106 
1107 static void set_format_emu_quirk(struct snd_usb_substream *subs,
1108 				 struct audioformat *fmt)
1109 {
1110 	unsigned char emu_samplerate_id = 0;
1111 
1112 	/* When capture is active
1113 	 * sample rate shouldn't be changed
1114 	 * by playback substream
1115 	 */
1116 	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
1117 		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
1118 			return;
1119 	}
1120 
1121 	switch (fmt->rate_min) {
1122 	case 48000:
1123 		emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
1124 		break;
1125 	case 88200:
1126 		emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
1127 		break;
1128 	case 96000:
1129 		emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
1130 		break;
1131 	case 176400:
1132 		emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
1133 		break;
1134 	case 192000:
1135 		emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
1136 		break;
1137 	default:
1138 		emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
1139 		break;
1140 	}
1141 	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
1142 	subs->pkt_offset_adj = (emu_samplerate_id >= EMU_QUIRK_SR_176400HZ) ? 4 : 0;
1143 }
1144 
1145 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
1146 			      struct audioformat *fmt)
1147 {
1148 	switch (subs->stream->chip->usb_id) {
1149 	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
1150 	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
1151 	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
1152 	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
1153 		set_format_emu_quirk(subs, fmt);
1154 		break;
1155 	}
1156 }
1157 
1158 bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip)
1159 {
1160 	/* devices which do not support reading the sample rate. */
1161 	switch (chip->usb_id) {
1162 	case USB_ID(0x041E, 0x4080): /* Creative Live Cam VF0610 */
1163 	case USB_ID(0x04D8, 0xFEEA): /* Benchmark DAC1 Pre */
1164 	case USB_ID(0x0556, 0x0014): /* Phoenix Audio TMX320VC */
1165 	case USB_ID(0x05A3, 0x9420): /* ELP HD USB Camera */
1166 	case USB_ID(0x074D, 0x3553): /* Outlaw RR2150 (Micronas UAC3553B) */
1167 	case USB_ID(0x1395, 0x740a): /* Sennheiser DECT */
1168 	case USB_ID(0x1901, 0x0191): /* GE B850V3 CP2114 audio interface */
1169 	case USB_ID(0x21B4, 0x0081): /* AudioQuest DragonFly */
1170 		return true;
1171 	}
1172 
1173 	/* devices of these vendors don't support reading rate, either */
1174 	switch (USB_ID_VENDOR(chip->usb_id)) {
1175 	case 0x045E: /* MS Lifecam */
1176 	case 0x047F: /* Plantronics */
1177 	case 0x1de7: /* Phoenix Audio */
1178 		return true;
1179 	}
1180 
1181 	return false;
1182 }
1183 
1184 /* ITF-USB DSD based DACs need a vendor cmd to switch
1185  * between PCM and native DSD mode
1186  */
1187 static bool is_itf_usb_dsd_dac(unsigned int id)
1188 {
1189 	switch (id) {
1190 	case USB_ID(0x154e, 0x1003): /* Denon DA-300USB */
1191 	case USB_ID(0x154e, 0x3005): /* Marantz HD-DAC1 */
1192 	case USB_ID(0x154e, 0x3006): /* Marantz SA-14S1 */
1193 	case USB_ID(0x1852, 0x5065): /* Luxman DA-06 */
1194 	case USB_ID(0x0644, 0x8043): /* TEAC UD-501/UD-501V2/UD-503/NT-503 */
1195 	case USB_ID(0x0644, 0x8044): /* Esoteric D-05X */
1196 	case USB_ID(0x0644, 0x804a): /* TEAC UD-301 */
1197 		return true;
1198 	}
1199 	return false;
1200 }
1201 
1202 int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
1203 			      struct audioformat *fmt)
1204 {
1205 	struct usb_device *dev = subs->dev;
1206 	int err;
1207 
1208 	if (is_itf_usb_dsd_dac(subs->stream->chip->usb_id)) {
1209 		/* First switch to alt set 0, otherwise the mode switch cmd
1210 		 * will not be accepted by the DAC
1211 		 */
1212 		err = usb_set_interface(dev, fmt->iface, 0);
1213 		if (err < 0)
1214 			return err;
1215 
1216 		msleep(20); /* Delay needed after setting the interface */
1217 
1218 		/* Vendor mode switch cmd is required. */
1219 		if (fmt->formats & SNDRV_PCM_FMTBIT_DSD_U32_BE) {
1220 			/* DSD mode (DSD_U32) requested */
1221 			err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0,
1222 					      USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1223 					      1, 1, NULL, 0);
1224 			if (err < 0)
1225 				return err;
1226 
1227 		} else {
1228 			/* PCM or DOP mode (S32) requested */
1229 			/* PCM mode (S16) requested */
1230 			err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0,
1231 					      USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1232 					      0, 1, NULL, 0);
1233 			if (err < 0)
1234 				return err;
1235 
1236 		}
1237 		msleep(20);
1238 	}
1239 	return 0;
1240 }
1241 
1242 void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
1243 {
1244 	/*
1245 	 * "Playback Design" products send bogus feedback data at the start
1246 	 * of the stream. Ignore them.
1247 	 */
1248 	if (USB_ID_VENDOR(ep->chip->usb_id) == 0x23ba &&
1249 	    ep->type == SND_USB_ENDPOINT_TYPE_SYNC)
1250 		ep->skip_packets = 4;
1251 
1252 	/*
1253 	 * M-Audio Fast Track C400/C600 - when packets are not skipped, real
1254 	 * world latency varies by approx. +/- 50 frames (at 96KHz) each time
1255 	 * the stream is (re)started. When skipping packets 16 at endpoint
1256 	 * start up, the real world latency is stable within +/- 1 frame (also
1257 	 * across power cycles).
1258 	 */
1259 	if ((ep->chip->usb_id == USB_ID(0x0763, 0x2030) ||
1260 	     ep->chip->usb_id == USB_ID(0x0763, 0x2031)) &&
1261 	    ep->type == SND_USB_ENDPOINT_TYPE_DATA)
1262 		ep->skip_packets = 16;
1263 
1264 	/* Work around devices that report unreasonable feedback data */
1265 	if ((ep->chip->usb_id == USB_ID(0x0644, 0x8038) ||  /* TEAC UD-H01 */
1266 	     ep->chip->usb_id == USB_ID(0x1852, 0x5034)) && /* T+A Dac8 */
1267 	    ep->syncmaxsize == 4)
1268 		ep->tenor_fb_quirk = 1;
1269 }
1270 
1271 void snd_usb_set_interface_quirk(struct usb_device *dev)
1272 {
1273 	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);
1274 
1275 	if (!chip)
1276 		return;
1277 	/*
1278 	 * "Playback Design" products need a 50ms delay after setting the
1279 	 * USB interface.
1280 	 */
1281 	switch (USB_ID_VENDOR(chip->usb_id)) {
1282 	case 0x23ba: /* Playback Design */
1283 	case 0x0644: /* TEAC Corp. */
1284 		msleep(50);
1285 		break;
1286 	}
1287 }
1288 
1289 /* quirk applied after snd_usb_ctl_msg(); not applied during boot quirks */
1290 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
1291 			   __u8 request, __u8 requesttype, __u16 value,
1292 			   __u16 index, void *data, __u16 size)
1293 {
1294 	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);
1295 
1296 	if (!chip)
1297 		return;
1298 	/*
1299 	 * "Playback Design" products need a 20ms delay after each
1300 	 * class compliant request
1301 	 */
1302 	if (USB_ID_VENDOR(chip->usb_id) == 0x23ba &&
1303 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1304 		msleep(20);
1305 
1306 	/*
1307 	 * "TEAC Corp." products need a 20ms delay after each
1308 	 * class compliant request
1309 	 */
1310 	if (USB_ID_VENDOR(chip->usb_id) == 0x0644 &&
1311 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1312 		msleep(20);
1313 
1314 	/* ITF-USB DSD based DACs functionality need a delay
1315 	 * after each class compliant request
1316 	 */
1317 	if (is_itf_usb_dsd_dac(chip->usb_id)
1318 	    && (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1319 		msleep(20);
1320 
1321 	/* Zoom R16/24, Logitech H650e, Jabra 550a needs a tiny delay here,
1322 	 * otherwise requests like get/set frequency return as failed despite
1323 	 * actually succeeding.
1324 	 */
1325 	if ((chip->usb_id == USB_ID(0x1686, 0x00dd) ||
1326 	     chip->usb_id == USB_ID(0x046d, 0x0a46) ||
1327 	     chip->usb_id == USB_ID(0x0b0e, 0x0349)) &&
1328 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
1329 		usleep_range(1000, 2000);
1330 }
1331 
1332 /*
1333  * snd_usb_interface_dsd_format_quirks() is called from format.c to
1334  * augment the PCM format bit-field for DSD types. The UAC standards
1335  * don't have a designated bit field to denote DSD-capable interfaces,
1336  * hence all hardware that is known to support this format has to be
1337  * listed here.
1338  */
1339 u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
1340 					struct audioformat *fp,
1341 					unsigned int sample_bytes)
1342 {
1343 	struct usb_interface *iface;
1344 
1345 	/* Playback Designs */
1346 	if (USB_ID_VENDOR(chip->usb_id) == 0x23ba) {
1347 		switch (fp->altsetting) {
1348 		case 1:
1349 			fp->dsd_dop = true;
1350 			return SNDRV_PCM_FMTBIT_DSD_U16_LE;
1351 		case 2:
1352 			fp->dsd_bitrev = true;
1353 			return SNDRV_PCM_FMTBIT_DSD_U8;
1354 		case 3:
1355 			fp->dsd_bitrev = true;
1356 			return SNDRV_PCM_FMTBIT_DSD_U16_LE;
1357 		}
1358 	}
1359 
1360 	/* XMOS based USB DACs */
1361 	switch (chip->usb_id) {
1362 	case USB_ID(0x1511, 0x0037): /* AURALiC VEGA */
1363 	case USB_ID(0x20b1, 0x0002): /* Wyred 4 Sound DAC-2 DSD */
1364 	case USB_ID(0x20b1, 0x2004): /* Matrix Audio X-SPDIF 2 */
1365 	case USB_ID(0x20b1, 0x2008): /* Matrix Audio X-Sabre */
1366 	case USB_ID(0x20b1, 0x300a): /* Matrix Audio Mini-i Pro */
1367 	case USB_ID(0x22d9, 0x0416): /* OPPO HA-1 */
1368 	case USB_ID(0x22d9, 0x0436): /* OPPO Sonica */
1369 	case USB_ID(0x22d9, 0x0461): /* OPPO UDP-205 */
1370 	case USB_ID(0x2522, 0x0012): /* LH Labs VI DAC Infinity */
1371 	case USB_ID(0x2772, 0x0230): /* Pro-Ject Pre Box S2 Digital */
1372 		if (fp->altsetting == 2)
1373 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1374 		break;
1375 
1376 	case USB_ID(0x16d0, 0x09dd): /* Encore mDSD */
1377 	case USB_ID(0x0d8c, 0x0316): /* Hegel HD12 DSD */
1378 	case USB_ID(0x16b0, 0x06b2): /* NuPrime DAC-10 */
1379 	case USB_ID(0x16d0, 0x0733): /* Furutech ADL Stratos */
1380 	case USB_ID(0x16d0, 0x09db): /* NuPrime Audio DAC-9 */
1381 	case USB_ID(0x1db5, 0x0003): /* Bryston BDA3 */
1382 	case USB_ID(0x20b1, 0x000a): /* Gustard DAC-X20U */
1383 	case USB_ID(0x20b1, 0x2005): /* Denafrips Ares DAC */
1384 	case USB_ID(0x20b1, 0x2009): /* DIYINHK DSD DXD 384kHz USB to I2S/DSD */
1385 	case USB_ID(0x20b1, 0x2023): /* JLsounds I2SoverUSB */
1386 	case USB_ID(0x20b1, 0x3021): /* Eastern El. MiniMax Tube DAC Supreme */
1387 	case USB_ID(0x20b1, 0x3023): /* Aune X1S 32BIT/384 DSD DAC */
1388 	case USB_ID(0x20b1, 0x302d): /* Unison Research Unico CD Due */
1389 	case USB_ID(0x20b1, 0x307b): /* CH Precision C1 DAC */
1390 	case USB_ID(0x20b1, 0x3086): /* Singxer F-1 converter board */
1391 	case USB_ID(0x22d9, 0x0426): /* OPPO HA-2 */
1392 	case USB_ID(0x22e1, 0xca01): /* HDTA Serenade DSD */
1393 	case USB_ID(0x249c, 0x9326): /* M2Tech Young MkIII */
1394 	case USB_ID(0x2616, 0x0106): /* PS Audio NuWave DAC */
1395 	case USB_ID(0x2622, 0x0041): /* Audiolab M-DAC+ */
1396 	case USB_ID(0x27f7, 0x3002): /* W4S DAC-2v2SE */
1397 	case USB_ID(0x29a2, 0x0086): /* Mutec MC3+ USB */
1398 	case USB_ID(0x6b42, 0x0042): /* MSB Technology */
1399 		if (fp->altsetting == 3)
1400 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1401 		break;
1402 
1403 	/* Amanero Combo384 USB based DACs with native DSD support */
1404 	case USB_ID(0x16d0, 0x071a):  /* Amanero - Combo384 */
1405 	case USB_ID(0x2ab6, 0x0004):  /* T+A DAC8DSD-V2.0, MP1000E-V2.0, MP2000R-V2.0, MP2500R-V2.0, MP3100HV-V2.0 */
1406 	case USB_ID(0x2ab6, 0x0005):  /* T+A USB HD Audio 1 */
1407 	case USB_ID(0x2ab6, 0x0006):  /* T+A USB HD Audio 2 */
1408 		if (fp->altsetting == 2) {
1409 			switch (le16_to_cpu(chip->dev->descriptor.bcdDevice)) {
1410 			case 0x199:
1411 				return SNDRV_PCM_FMTBIT_DSD_U32_LE;
1412 			case 0x19b:
1413 			case 0x203:
1414 				return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1415 			default:
1416 				break;
1417 			}
1418 		}
1419 		break;
1420 	case USB_ID(0x16d0, 0x0a23):
1421 		if (fp->altsetting == 2)
1422 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1423 		break;
1424 
1425 	default:
1426 		break;
1427 	}
1428 
1429 	/* ITF-USB DSD based DACs */
1430 	if (is_itf_usb_dsd_dac(chip->usb_id)) {
1431 		iface = usb_ifnum_to_if(chip->dev, fp->iface);
1432 
1433 		/* Altsetting 2 support native DSD if the num of altsets is
1434 		 * three (0-2),
1435 		 * Altsetting 3 support native DSD if the num of altsets is
1436 		 * four (0-3).
1437 		 */
1438 		if (fp->altsetting == iface->num_altsetting - 1)
1439 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1440 	}
1441 
1442 	/* Mostly generic method to detect many DSD-capable implementations -
1443 	 * from XMOS/Thesycon
1444 	 */
1445 	switch (USB_ID_VENDOR(chip->usb_id)) {
1446 	case 0x20b1:  /* XMOS based devices */
1447 	case 0x152a:  /* Thesycon devices */
1448 	case 0x25ce:  /* Mytek devices */
1449 		if (fp->dsd_raw)
1450 			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
1451 		break;
1452 	default:
1453 		break;
1454 
1455 	}
1456 
1457 	return 0;
1458 }
1459 
1460 void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
1461 					  struct audioformat *fp,
1462 					  int stream)
1463 {
1464 	switch (chip->usb_id) {
1465 	case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
1466 		/* Optoplay sets the sample rate attribute although
1467 		 * it seems not supporting it in fact.
1468 		 */
1469 		fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
1470 		break;
1471 	case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
1472 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
1473 		/* doesn't set the sample rate attribute, but supports it */
1474 		fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
1475 		break;
1476 	case USB_ID(0x0763, 0x2001):  /* M-Audio Quattro USB */
1477 	case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
1478 	case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
1479 	case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
1480 					an older model 77d:223) */
1481 	/*
1482 	 * plantronics headset and Griffin iMic have set adaptive-in
1483 	 * although it's really not...
1484 	 */
1485 		fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
1486 		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1487 			fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
1488 		else
1489 			fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
1490 		break;
1491 	}
1492 }
1493