xref: /openbmc/linux/sound/usb/quirks.c (revision e190bfe5) 
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 
22 #include <sound/core.h>
23 #include <sound/info.h>
24 #include <sound/pcm.h>
25 
26 #include "usbaudio.h"
27 #include "card.h"
28 #include "mixer.h"
29 #include "mixer_quirks.h"
30 #include "midi.h"
31 #include "quirks.h"
32 #include "helper.h"
33 #include "endpoint.h"
34 #include "pcm.h"
35 
36 /*
37  * handle the quirks for the contained interfaces
38  */
39 static int create_composite_quirk(struct snd_usb_audio *chip,
40 				  struct usb_interface *iface,
41 				  struct usb_driver *driver,
42 				  const struct snd_usb_audio_quirk *quirk)
43 {
44 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
45 	int err;
46 
47 	for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
48 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
49 		if (!iface)
50 			continue;
51 		if (quirk->ifnum != probed_ifnum &&
52 		    usb_interface_claimed(iface))
53 			continue;
54 		err = snd_usb_create_quirk(chip, iface, driver, quirk);
55 		if (err < 0)
56 			return err;
57 		if (quirk->ifnum != probed_ifnum)
58 			usb_driver_claim_interface(driver, iface, (void *)-1L);
59 	}
60 	return 0;
61 }
62 
63 static int ignore_interface_quirk(struct snd_usb_audio *chip,
64 				  struct usb_interface *iface,
65 				  struct usb_driver *driver,
66 				  const struct snd_usb_audio_quirk *quirk)
67 {
68 	return 0;
69 }
70 
71 
72 /*
73  * Allow alignment on audio sub-slot (channel samples) rather than
74  * on audio slots (audio frames)
75  */
76 static int create_align_transfer_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 	chip->txfr_quirk = 1;
82 	return 1;	/* Continue with creating streams and mixer */
83 }
84 
85 static int create_any_midi_quirk(struct snd_usb_audio *chip,
86 				 struct usb_interface *intf,
87 				 struct usb_driver *driver,
88 				 const struct snd_usb_audio_quirk *quirk)
89 {
90 	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
91 }
92 
93 /*
94  * create a stream for an interface with proper descriptors
95  */
96 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
97 				       struct usb_interface *iface,
98 				       struct usb_driver *driver,
99 				       const struct snd_usb_audio_quirk *quirk)
100 {
101 	struct usb_host_interface *alts;
102 	struct usb_interface_descriptor *altsd;
103 	int err;
104 
105 	alts = &iface->altsetting[0];
106 	altsd = get_iface_desc(alts);
107 	err = snd_usb_parse_audio_endpoints(chip, altsd->bInterfaceNumber);
108 	if (err < 0) {
109 		snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
110 			   altsd->bInterfaceNumber, err);
111 		return err;
112 	}
113 	/* reset the current interface */
114 	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
115 	return 0;
116 }
117 
118 /*
119  * create a stream for an endpoint/altsetting without proper descriptors
120  */
121 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
122 				     struct usb_interface *iface,
123 				     struct usb_driver *driver,
124 				     const struct snd_usb_audio_quirk *quirk)
125 {
126 	struct audioformat *fp;
127 	struct usb_host_interface *alts;
128 	int stream, err;
129 	unsigned *rate_table = NULL;
130 
131 	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
132 	if (! fp) {
133 		snd_printk(KERN_ERR "cannot memdup\n");
134 		return -ENOMEM;
135 	}
136 	if (fp->nr_rates > 0) {
137 		rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
138 		if (!rate_table) {
139 			kfree(fp);
140 			return -ENOMEM;
141 		}
142 		memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
143 		fp->rate_table = rate_table;
144 	}
145 
146 	stream = (fp->endpoint & USB_DIR_IN)
147 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
148 	err = snd_usb_add_audio_endpoint(chip, stream, fp);
149 	if (err < 0) {
150 		kfree(fp);
151 		kfree(rate_table);
152 		return err;
153 	}
154 	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
155 	    fp->altset_idx >= iface->num_altsetting) {
156 		kfree(fp);
157 		kfree(rate_table);
158 		return -EINVAL;
159 	}
160 	alts = &iface->altsetting[fp->altset_idx];
161 	fp->datainterval = snd_usb_parse_datainterval(chip, alts);
162 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
163 	usb_set_interface(chip->dev, fp->iface, 0);
164 	snd_usb_init_pitch(chip, fp->iface, alts, fp);
165 	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
166 	return 0;
167 }
168 
169 /*
170  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
171  * The only way to detect the sample rate is by looking at wMaxPacketSize.
172  */
173 static int create_uaxx_quirk(struct snd_usb_audio *chip,
174 			     struct usb_interface *iface,
175 			     struct usb_driver *driver,
176 			     const struct snd_usb_audio_quirk *quirk)
177 {
178 	static const struct audioformat ua_format = {
179 		.formats = SNDRV_PCM_FMTBIT_S24_3LE,
180 		.channels = 2,
181 		.fmt_type = UAC_FORMAT_TYPE_I,
182 		.altsetting = 1,
183 		.altset_idx = 1,
184 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
185 	};
186 	struct usb_host_interface *alts;
187 	struct usb_interface_descriptor *altsd;
188 	struct audioformat *fp;
189 	int stream, err;
190 
191 	/* both PCM and MIDI interfaces have 2 or more altsettings */
192 	if (iface->num_altsetting < 2)
193 		return -ENXIO;
194 	alts = &iface->altsetting[1];
195 	altsd = get_iface_desc(alts);
196 
197 	if (altsd->bNumEndpoints == 2) {
198 		static const struct snd_usb_midi_endpoint_info ua700_ep = {
199 			.out_cables = 0x0003,
200 			.in_cables  = 0x0003
201 		};
202 		static const struct snd_usb_audio_quirk ua700_quirk = {
203 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
204 			.data = &ua700_ep
205 		};
206 		static const struct snd_usb_midi_endpoint_info uaxx_ep = {
207 			.out_cables = 0x0001,
208 			.in_cables  = 0x0001
209 		};
210 		static const struct snd_usb_audio_quirk uaxx_quirk = {
211 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
212 			.data = &uaxx_ep
213 		};
214 		const struct snd_usb_audio_quirk *quirk =
215 			chip->usb_id == USB_ID(0x0582, 0x002b)
216 			? &ua700_quirk : &uaxx_quirk;
217 		return snd_usbmidi_create(chip->card, iface,
218 					  &chip->midi_list, quirk);
219 	}
220 
221 	if (altsd->bNumEndpoints != 1)
222 		return -ENXIO;
223 
224 	fp = kmalloc(sizeof(*fp), GFP_KERNEL);
225 	if (!fp)
226 		return -ENOMEM;
227 	memcpy(fp, &ua_format, sizeof(*fp));
228 
229 	fp->iface = altsd->bInterfaceNumber;
230 	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
231 	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
232 	fp->datainterval = 0;
233 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
234 
235 	switch (fp->maxpacksize) {
236 	case 0x120:
237 		fp->rate_max = fp->rate_min = 44100;
238 		break;
239 	case 0x138:
240 	case 0x140:
241 		fp->rate_max = fp->rate_min = 48000;
242 		break;
243 	case 0x258:
244 	case 0x260:
245 		fp->rate_max = fp->rate_min = 96000;
246 		break;
247 	default:
248 		snd_printk(KERN_ERR "unknown sample rate\n");
249 		kfree(fp);
250 		return -ENXIO;
251 	}
252 
253 	stream = (fp->endpoint & USB_DIR_IN)
254 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
255 	err = snd_usb_add_audio_endpoint(chip, stream, fp);
256 	if (err < 0) {
257 		kfree(fp);
258 		return err;
259 	}
260 	usb_set_interface(chip->dev, fp->iface, 0);
261 	return 0;
262 }
263 
264 /*
265  * audio-interface quirks
266  *
267  * returns zero if no standard audio/MIDI parsing is needed.
268  * returns a postive value if standard audio/midi interfaces are parsed
269  * after this.
270  * returns a negative value at error.
271  */
272 int snd_usb_create_quirk(struct snd_usb_audio *chip,
273 			 struct usb_interface *iface,
274 			 struct usb_driver *driver,
275 			 const struct snd_usb_audio_quirk *quirk)
276 {
277 	typedef int (*quirk_func_t)(struct snd_usb_audio *,
278 				    struct usb_interface *,
279 				    struct usb_driver *,
280 				    const struct snd_usb_audio_quirk *);
281 	static const quirk_func_t quirk_funcs[] = {
282 		[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
283 		[QUIRK_COMPOSITE] = create_composite_quirk,
284 		[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
285 		[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
286 		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
287 		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
288 		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
289 		[QUIRK_MIDI_FASTLANE] = create_any_midi_quirk,
290 		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
291 		[QUIRK_MIDI_CME] = create_any_midi_quirk,
292 		[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
293 		[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
294 		[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
295 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
296 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk
297 	};
298 
299 	if (quirk->type < QUIRK_TYPE_COUNT) {
300 		return quirk_funcs[quirk->type](chip, iface, driver, quirk);
301 	} else {
302 		snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
303 		return -ENXIO;
304 	}
305 }
306 
307 /*
308  * boot quirks
309  */
310 
311 #define EXTIGY_FIRMWARE_SIZE_OLD 794
312 #define EXTIGY_FIRMWARE_SIZE_NEW 483
313 
314 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
315 {
316 	struct usb_host_config *config = dev->actconfig;
317 	int err;
318 
319 	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
320 	    le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
321 		snd_printdd("sending Extigy boot sequence...\n");
322 		/* Send message to force it to reconnect with full interface. */
323 		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
324 				      0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
325 		if (err < 0) snd_printdd("error sending boot message: %d\n", err);
326 		err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
327 				&dev->descriptor, sizeof(dev->descriptor));
328 		config = dev->actconfig;
329 		if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
330 		err = usb_reset_configuration(dev);
331 		if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
332 		snd_printdd("extigy_boot: new boot length = %d\n",
333 			    le16_to_cpu(get_cfg_desc(config)->wTotalLength));
334 		return -ENODEV; /* quit this anyway */
335 	}
336 	return 0;
337 }
338 
339 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
340 {
341 	u8 buf = 1;
342 
343 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
344 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
345 			0, 0, &buf, 1, 1000);
346 	if (buf == 0) {
347 		snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
348 				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
349 				1, 2000, NULL, 0, 1000);
350 		return -ENODEV;
351 	}
352 	return 0;
353 }
354 
355 /*
356  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
357  * documented in the device's data sheet.
358  */
359 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
360 {
361 	u8 buf[4];
362 	buf[0] = 0x20;
363 	buf[1] = value & 0xff;
364 	buf[2] = (value >> 8) & 0xff;
365 	buf[3] = reg;
366 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
367 			       USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
368 			       0, 0, &buf, 4, 1000);
369 }
370 
371 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
372 {
373 	/*
374 	 * Enable line-out driver mode, set headphone source to front
375 	 * channels, enable stereo mic.
376 	 */
377 	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
378 }
379 
380 /*
381  * C-Media CM6206 is based on CM106 with two additional
382  * registers that are not documented in the data sheet.
383  * Values here are chosen based on sniffing USB traffic
384  * under Windows.
385  */
386 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
387 {
388 	int err, reg;
389 	int val[] = {0x200c, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
390 
391 	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
392 		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
393 		if (err < 0)
394 			return err;
395 	}
396 
397 	return err;
398 }
399 
400 /*
401  * This call will put the synth in "USB send" mode, i.e it will send MIDI
402  * messages through USB (this is disabled at startup). The synth will
403  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
404  * sign on its LCD. Values here are chosen based on sniffing USB traffic
405  * under Windows.
406  */
407 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
408 {
409 	int err, actual_length;
410 
411 	/* "midi send" enable */
412 	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
413 
414 	void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
415 	if (!buf)
416 		return -ENOMEM;
417 	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
418 			ARRAY_SIZE(seq), &actual_length, 1000);
419 	kfree(buf);
420 	if (err < 0)
421 		return err;
422 
423 	return 0;
424 }
425 
426 /*
427  * Setup quirks
428  */
429 #define AUDIOPHILE_SET			0x01 /* if set, parse device_setup */
430 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
431 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
432 #define AUDIOPHILE_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
433 #define AUDIOPHILE_SET_DI		0x10 /* if set, enable Digital Input */
434 #define AUDIOPHILE_SET_MASK		0x1F /* bit mask for setup value */
435 #define AUDIOPHILE_SET_24B_48K_DI	0x19 /* value for 24bits+48KHz+Digital Input */
436 #define AUDIOPHILE_SET_24B_48K_NOTDI	0x09 /* value for 24bits+48KHz+No Digital Input */
437 #define AUDIOPHILE_SET_16B_48K_DI	0x11 /* value for 16bits+48KHz+Digital Input */
438 #define AUDIOPHILE_SET_16B_48K_NOTDI	0x01 /* value for 16bits+48KHz+No Digital Input */
439 
440 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
441 					 int iface,
442 					 int altno)
443 {
444 	/* Reset ALL ifaces to 0 altsetting.
445 	 * Call it for every possible altsetting of every interface.
446 	 */
447 	usb_set_interface(chip->dev, iface, 0);
448 
449 	if (chip->setup & AUDIOPHILE_SET) {
450 		if ((chip->setup & AUDIOPHILE_SET_DTS)
451 		    && altno != 6)
452 			return 1; /* skip this altsetting */
453 		if ((chip->setup & AUDIOPHILE_SET_96K)
454 		    && altno != 1)
455 			return 1; /* skip this altsetting */
456 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
457 		    AUDIOPHILE_SET_24B_48K_DI && altno != 2)
458 			return 1; /* skip this altsetting */
459 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
460 		    AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
461 			return 1; /* skip this altsetting */
462 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
463 		    AUDIOPHILE_SET_16B_48K_DI && altno != 4)
464 			return 1; /* skip this altsetting */
465 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
466 		    AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
467 			return 1; /* skip this altsetting */
468 	}
469 
470 	return 0; /* keep this altsetting */
471 }
472 
473 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
474 				  int iface,
475 				  int altno)
476 {
477 	/* audiophile usb: skip altsets incompatible with device_setup */
478 	if (chip->usb_id == USB_ID(0x0763, 0x2003))
479 		return audiophile_skip_setting_quirk(chip, iface, altno);
480 
481 	return 0;
482 }
483 
484 int snd_usb_apply_boot_quirk(struct usb_device *dev,
485 			     struct usb_interface *intf,
486 			     const struct snd_usb_audio_quirk *quirk)
487 {
488 	u32 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
489 			le16_to_cpu(dev->descriptor.idProduct));
490 
491 	/* SB Extigy needs special boot-up sequence */
492 	/* if more models come, this will go to the quirk list. */
493 	if (id == USB_ID(0x041e, 0x3000))
494 		return snd_usb_extigy_boot_quirk(dev, intf);
495 
496 	/* SB Audigy 2 NX needs its own boot-up magic, too */
497 	if (id == USB_ID(0x041e, 0x3020))
498 		return snd_usb_audigy2nx_boot_quirk(dev);
499 
500 	/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
501 	if (id == USB_ID(0x10f5, 0x0200))
502 		return snd_usb_cm106_boot_quirk(dev);
503 
504 	/* C-Media CM6206 / CM106-Like Sound Device */
505 	if (id == USB_ID(0x0d8c, 0x0102))
506 		return snd_usb_cm6206_boot_quirk(dev);
507 
508 	/* Access Music VirusTI Desktop */
509 	if (id == USB_ID(0x133e, 0x0815))
510 		return snd_usb_accessmusic_boot_quirk(dev);
511 
512 	return 0;
513 }
514 
515 /*
516  * check if the device uses big-endian samples
517  */
518 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
519 {
520 	switch (chip->usb_id) {
521 	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
522 		if (fp->endpoint & USB_DIR_IN)
523 			return 1;
524 		break;
525 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
526 		if (chip->setup == 0x00 ||
527 		    fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
528 			return 1;
529 	}
530 	return 0;
531 }
532 
533 /*
534  * For E-Mu 0404USB/0202USB/TrackerPre sample rate should be set for device,
535  * not for interface.
536  */
537 
538 enum {
539 	EMU_QUIRK_SR_44100HZ = 0,
540 	EMU_QUIRK_SR_48000HZ,
541 	EMU_QUIRK_SR_88200HZ,
542 	EMU_QUIRK_SR_96000HZ,
543 	EMU_QUIRK_SR_176400HZ,
544 	EMU_QUIRK_SR_192000HZ
545 };
546 
547 static void set_format_emu_quirk(struct snd_usb_substream *subs,
548 				 struct audioformat *fmt)
549 {
550 	unsigned char emu_samplerate_id = 0;
551 
552 	/* When capture is active
553 	 * sample rate shouldn't be changed
554 	 * by playback substream
555 	 */
556 	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
557 		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
558 			return;
559 	}
560 
561 	switch (fmt->rate_min) {
562 	case 48000:
563 		emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
564 		break;
565 	case 88200:
566 		emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
567 		break;
568 	case 96000:
569 		emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
570 		break;
571 	case 176400:
572 		emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
573 		break;
574 	case 192000:
575 		emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
576 		break;
577 	default:
578 		emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
579 		break;
580 	}
581 	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
582 }
583 
584 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
585 			      struct audioformat *fmt)
586 {
587 	switch (subs->stream->chip->usb_id) {
588 	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
589 	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
590 	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
591 		set_format_emu_quirk(subs, fmt);
592 		break;
593 	}
594 }
595 
596