xref: /openbmc/linux/sound/usb/quirks.c (revision b595076a) 
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 #include "clock.h"
36 
37 /*
38  * handle the quirks for the contained interfaces
39  */
40 static int create_composite_quirk(struct snd_usb_audio *chip,
41 				  struct usb_interface *iface,
42 				  struct usb_driver *driver,
43 				  const struct snd_usb_audio_quirk *quirk)
44 {
45 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
46 	int err;
47 
48 	for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
49 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
50 		if (!iface)
51 			continue;
52 		if (quirk->ifnum != probed_ifnum &&
53 		    usb_interface_claimed(iface))
54 			continue;
55 		err = snd_usb_create_quirk(chip, iface, driver, quirk);
56 		if (err < 0)
57 			return err;
58 		if (quirk->ifnum != probed_ifnum)
59 			usb_driver_claim_interface(driver, iface, (void *)-1L);
60 	}
61 	return 0;
62 }
63 
64 static int ignore_interface_quirk(struct snd_usb_audio *chip,
65 				  struct usb_interface *iface,
66 				  struct usb_driver *driver,
67 				  const struct snd_usb_audio_quirk *quirk)
68 {
69 	return 0;
70 }
71 
72 
73 /*
74  * Allow alignment on audio sub-slot (channel samples) rather than
75  * on audio slots (audio frames)
76  */
77 static int create_align_transfer_quirk(struct snd_usb_audio *chip,
78 				       struct usb_interface *iface,
79 				       struct usb_driver *driver,
80 				       const struct snd_usb_audio_quirk *quirk)
81 {
82 	chip->txfr_quirk = 1;
83 	return 1;	/* Continue with creating streams and mixer */
84 }
85 
86 static int create_any_midi_quirk(struct snd_usb_audio *chip,
87 				 struct usb_interface *intf,
88 				 struct usb_driver *driver,
89 				 const struct snd_usb_audio_quirk *quirk)
90 {
91 	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
92 }
93 
94 /*
95  * create a stream for an interface with proper descriptors
96  */
97 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
98 				       struct usb_interface *iface,
99 				       struct usb_driver *driver,
100 				       const struct snd_usb_audio_quirk *quirk)
101 {
102 	struct usb_host_interface *alts;
103 	struct usb_interface_descriptor *altsd;
104 	int err;
105 
106 	alts = &iface->altsetting[0];
107 	altsd = get_iface_desc(alts);
108 	err = snd_usb_parse_audio_endpoints(chip, altsd->bInterfaceNumber);
109 	if (err < 0) {
110 		snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
111 			   altsd->bInterfaceNumber, err);
112 		return err;
113 	}
114 	/* reset the current interface */
115 	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
116 	return 0;
117 }
118 
119 /*
120  * create a stream for an endpoint/altsetting without proper descriptors
121  */
122 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
123 				     struct usb_interface *iface,
124 				     struct usb_driver *driver,
125 				     const struct snd_usb_audio_quirk *quirk)
126 {
127 	struct audioformat *fp;
128 	struct usb_host_interface *alts;
129 	int stream, err;
130 	unsigned *rate_table = NULL;
131 
132 	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
133 	if (! fp) {
134 		snd_printk(KERN_ERR "cannot memdup\n");
135 		return -ENOMEM;
136 	}
137 	if (fp->nr_rates > 0) {
138 		rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
139 		if (!rate_table) {
140 			kfree(fp);
141 			return -ENOMEM;
142 		}
143 		memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
144 		fp->rate_table = rate_table;
145 	}
146 
147 	stream = (fp->endpoint & USB_DIR_IN)
148 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
149 	err = snd_usb_add_audio_endpoint(chip, stream, fp);
150 	if (err < 0) {
151 		kfree(fp);
152 		kfree(rate_table);
153 		return err;
154 	}
155 	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
156 	    fp->altset_idx >= iface->num_altsetting) {
157 		kfree(fp);
158 		kfree(rate_table);
159 		return -EINVAL;
160 	}
161 	alts = &iface->altsetting[fp->altset_idx];
162 	fp->datainterval = snd_usb_parse_datainterval(chip, alts);
163 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
164 	usb_set_interface(chip->dev, fp->iface, 0);
165 	snd_usb_init_pitch(chip, fp->iface, alts, fp);
166 	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
167 	return 0;
168 }
169 
170 /*
171  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
172  * The only way to detect the sample rate is by looking at wMaxPacketSize.
173  */
174 static int create_uaxx_quirk(struct snd_usb_audio *chip,
175 			     struct usb_interface *iface,
176 			     struct usb_driver *driver,
177 			     const struct snd_usb_audio_quirk *quirk)
178 {
179 	static const struct audioformat ua_format = {
180 		.formats = SNDRV_PCM_FMTBIT_S24_3LE,
181 		.channels = 2,
182 		.fmt_type = UAC_FORMAT_TYPE_I,
183 		.altsetting = 1,
184 		.altset_idx = 1,
185 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
186 	};
187 	struct usb_host_interface *alts;
188 	struct usb_interface_descriptor *altsd;
189 	struct audioformat *fp;
190 	int stream, err;
191 
192 	/* both PCM and MIDI interfaces have 2 or more altsettings */
193 	if (iface->num_altsetting < 2)
194 		return -ENXIO;
195 	alts = &iface->altsetting[1];
196 	altsd = get_iface_desc(alts);
197 
198 	if (altsd->bNumEndpoints == 2) {
199 		static const struct snd_usb_midi_endpoint_info ua700_ep = {
200 			.out_cables = 0x0003,
201 			.in_cables  = 0x0003
202 		};
203 		static const struct snd_usb_audio_quirk ua700_quirk = {
204 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
205 			.data = &ua700_ep
206 		};
207 		static const struct snd_usb_midi_endpoint_info uaxx_ep = {
208 			.out_cables = 0x0001,
209 			.in_cables  = 0x0001
210 		};
211 		static const struct snd_usb_audio_quirk uaxx_quirk = {
212 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
213 			.data = &uaxx_ep
214 		};
215 		const struct snd_usb_audio_quirk *quirk =
216 			chip->usb_id == USB_ID(0x0582, 0x002b)
217 			? &ua700_quirk : &uaxx_quirk;
218 		return snd_usbmidi_create(chip->card, iface,
219 					  &chip->midi_list, quirk);
220 	}
221 
222 	if (altsd->bNumEndpoints != 1)
223 		return -ENXIO;
224 
225 	fp = kmalloc(sizeof(*fp), GFP_KERNEL);
226 	if (!fp)
227 		return -ENOMEM;
228 	memcpy(fp, &ua_format, sizeof(*fp));
229 
230 	fp->iface = altsd->bInterfaceNumber;
231 	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
232 	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
233 	fp->datainterval = 0;
234 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
235 
236 	switch (fp->maxpacksize) {
237 	case 0x120:
238 		fp->rate_max = fp->rate_min = 44100;
239 		break;
240 	case 0x138:
241 	case 0x140:
242 		fp->rate_max = fp->rate_min = 48000;
243 		break;
244 	case 0x258:
245 	case 0x260:
246 		fp->rate_max = fp->rate_min = 96000;
247 		break;
248 	default:
249 		snd_printk(KERN_ERR "unknown sample rate\n");
250 		kfree(fp);
251 		return -ENXIO;
252 	}
253 
254 	stream = (fp->endpoint & USB_DIR_IN)
255 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
256 	err = snd_usb_add_audio_endpoint(chip, stream, fp);
257 	if (err < 0) {
258 		kfree(fp);
259 		return err;
260 	}
261 	usb_set_interface(chip->dev, fp->iface, 0);
262 	return 0;
263 }
264 
265 /*
266  * audio-interface quirks
267  *
268  * returns zero if no standard audio/MIDI parsing is needed.
269  * returns a postive value if standard audio/midi interfaces are parsed
270  * after this.
271  * returns a negative value at error.
272  */
273 int snd_usb_create_quirk(struct snd_usb_audio *chip,
274 			 struct usb_interface *iface,
275 			 struct usb_driver *driver,
276 			 const struct snd_usb_audio_quirk *quirk)
277 {
278 	typedef int (*quirk_func_t)(struct snd_usb_audio *,
279 				    struct usb_interface *,
280 				    struct usb_driver *,
281 				    const struct snd_usb_audio_quirk *);
282 	static const quirk_func_t quirk_funcs[] = {
283 		[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
284 		[QUIRK_COMPOSITE] = create_composite_quirk,
285 		[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
286 		[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
287 		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
288 		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
289 		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
290 		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
291 		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
292 		[QUIRK_MIDI_CME] = create_any_midi_quirk,
293 		[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
294 		[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
295 		[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
296 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
297 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk
298 	};
299 
300 	if (quirk->type < QUIRK_TYPE_COUNT) {
301 		return quirk_funcs[quirk->type](chip, iface, driver, quirk);
302 	} else {
303 		snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
304 		return -ENXIO;
305 	}
306 }
307 
308 /*
309  * boot quirks
310  */
311 
312 #define EXTIGY_FIRMWARE_SIZE_OLD 794
313 #define EXTIGY_FIRMWARE_SIZE_NEW 483
314 
315 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
316 {
317 	struct usb_host_config *config = dev->actconfig;
318 	int err;
319 
320 	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
321 	    le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
322 		snd_printdd("sending Extigy boot sequence...\n");
323 		/* Send message to force it to reconnect with full interface. */
324 		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
325 				      0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
326 		if (err < 0) snd_printdd("error sending boot message: %d\n", err);
327 		err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
328 				&dev->descriptor, sizeof(dev->descriptor));
329 		config = dev->actconfig;
330 		if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
331 		err = usb_reset_configuration(dev);
332 		if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
333 		snd_printdd("extigy_boot: new boot length = %d\n",
334 			    le16_to_cpu(get_cfg_desc(config)->wTotalLength));
335 		return -ENODEV; /* quit this anyway */
336 	}
337 	return 0;
338 }
339 
340 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
341 {
342 	u8 buf = 1;
343 
344 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
345 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
346 			0, 0, &buf, 1, 1000);
347 	if (buf == 0) {
348 		snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
349 				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
350 				1, 2000, NULL, 0, 1000);
351 		return -ENODEV;
352 	}
353 	return 0;
354 }
355 
356 /*
357  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
358  * documented in the device's data sheet.
359  */
360 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
361 {
362 	u8 buf[4];
363 	buf[0] = 0x20;
364 	buf[1] = value & 0xff;
365 	buf[2] = (value >> 8) & 0xff;
366 	buf[3] = reg;
367 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
368 			       USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
369 			       0, 0, &buf, 4, 1000);
370 }
371 
372 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
373 {
374 	/*
375 	 * Enable line-out driver mode, set headphone source to front
376 	 * channels, enable stereo mic.
377 	 */
378 	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
379 }
380 
381 /*
382  * C-Media CM6206 is based on CM106 with two additional
383  * registers that are not documented in the data sheet.
384  * Values here are chosen based on sniffing USB traffic
385  * under Windows.
386  */
387 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
388 {
389 	int err, reg;
390 	int val[] = {0x200c, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
391 
392 	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
393 		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
394 		if (err < 0)
395 			return err;
396 	}
397 
398 	return err;
399 }
400 
401 /*
402  * This call will put the synth in "USB send" mode, i.e it will send MIDI
403  * messages through USB (this is disabled at startup). The synth will
404  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
405  * sign on its LCD. Values here are chosen based on sniffing USB traffic
406  * under Windows.
407  */
408 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
409 {
410 	int err, actual_length;
411 
412 	/* "midi send" enable */
413 	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
414 
415 	void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
416 	if (!buf)
417 		return -ENOMEM;
418 	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
419 			ARRAY_SIZE(seq), &actual_length, 1000);
420 	kfree(buf);
421 	if (err < 0)
422 		return err;
423 
424 	return 0;
425 }
426 
427 /*
428  * Setup quirks
429  */
430 #define AUDIOPHILE_SET			0x01 /* if set, parse device_setup */
431 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
432 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
433 #define AUDIOPHILE_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
434 #define AUDIOPHILE_SET_DI		0x10 /* if set, enable Digital Input */
435 #define AUDIOPHILE_SET_MASK		0x1F /* bit mask for setup value */
436 #define AUDIOPHILE_SET_24B_48K_DI	0x19 /* value for 24bits+48KHz+Digital Input */
437 #define AUDIOPHILE_SET_24B_48K_NOTDI	0x09 /* value for 24bits+48KHz+No Digital Input */
438 #define AUDIOPHILE_SET_16B_48K_DI	0x11 /* value for 16bits+48KHz+Digital Input */
439 #define AUDIOPHILE_SET_16B_48K_NOTDI	0x01 /* value for 16bits+48KHz+No Digital Input */
440 
441 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
442 					 int iface,
443 					 int altno)
444 {
445 	/* Reset ALL ifaces to 0 altsetting.
446 	 * Call it for every possible altsetting of every interface.
447 	 */
448 	usb_set_interface(chip->dev, iface, 0);
449 
450 	if (chip->setup & AUDIOPHILE_SET) {
451 		if ((chip->setup & AUDIOPHILE_SET_DTS)
452 		    && altno != 6)
453 			return 1; /* skip this altsetting */
454 		if ((chip->setup & AUDIOPHILE_SET_96K)
455 		    && altno != 1)
456 			return 1; /* skip this altsetting */
457 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
458 		    AUDIOPHILE_SET_24B_48K_DI && altno != 2)
459 			return 1; /* skip this altsetting */
460 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
461 		    AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
462 			return 1; /* skip this altsetting */
463 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
464 		    AUDIOPHILE_SET_16B_48K_DI && altno != 4)
465 			return 1; /* skip this altsetting */
466 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
467 		    AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
468 			return 1; /* skip this altsetting */
469 	}
470 
471 	return 0; /* keep this altsetting */
472 }
473 
474 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
475 				  int iface,
476 				  int altno)
477 {
478 	/* audiophile usb: skip altsets incompatible with device_setup */
479 	if (chip->usb_id == USB_ID(0x0763, 0x2003))
480 		return audiophile_skip_setting_quirk(chip, iface, altno);
481 
482 	return 0;
483 }
484 
485 int snd_usb_apply_boot_quirk(struct usb_device *dev,
486 			     struct usb_interface *intf,
487 			     const struct snd_usb_audio_quirk *quirk)
488 {
489 	u32 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
490 			le16_to_cpu(dev->descriptor.idProduct));
491 
492 	/* SB Extigy needs special boot-up sequence */
493 	/* if more models come, this will go to the quirk list. */
494 	if (id == USB_ID(0x041e, 0x3000))
495 		return snd_usb_extigy_boot_quirk(dev, intf);
496 
497 	/* SB Audigy 2 NX needs its own boot-up magic, too */
498 	if (id == USB_ID(0x041e, 0x3020))
499 		return snd_usb_audigy2nx_boot_quirk(dev);
500 
501 	/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
502 	if (id == USB_ID(0x10f5, 0x0200))
503 		return snd_usb_cm106_boot_quirk(dev);
504 
505 	/* C-Media CM6206 / CM106-Like Sound Device */
506 	if (id == USB_ID(0x0d8c, 0x0102))
507 		return snd_usb_cm6206_boot_quirk(dev);
508 
509 	/* Access Music VirusTI Desktop */
510 	if (id == USB_ID(0x133e, 0x0815))
511 		return snd_usb_accessmusic_boot_quirk(dev);
512 
513 	return 0;
514 }
515 
516 /*
517  * check if the device uses big-endian samples
518  */
519 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
520 {
521 	switch (chip->usb_id) {
522 	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
523 		if (fp->endpoint & USB_DIR_IN)
524 			return 1;
525 		break;
526 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
527 		if (chip->setup == 0x00 ||
528 		    fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
529 			return 1;
530 	}
531 	return 0;
532 }
533 
534 /*
535  * For E-Mu 0404USB/0202USB/TrackerPre sample rate should be set for device,
536  * not for interface.
537  */
538 
539 enum {
540 	EMU_QUIRK_SR_44100HZ = 0,
541 	EMU_QUIRK_SR_48000HZ,
542 	EMU_QUIRK_SR_88200HZ,
543 	EMU_QUIRK_SR_96000HZ,
544 	EMU_QUIRK_SR_176400HZ,
545 	EMU_QUIRK_SR_192000HZ
546 };
547 
548 static void set_format_emu_quirk(struct snd_usb_substream *subs,
549 				 struct audioformat *fmt)
550 {
551 	unsigned char emu_samplerate_id = 0;
552 
553 	/* When capture is active
554 	 * sample rate shouldn't be changed
555 	 * by playback substream
556 	 */
557 	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
558 		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
559 			return;
560 	}
561 
562 	switch (fmt->rate_min) {
563 	case 48000:
564 		emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
565 		break;
566 	case 88200:
567 		emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
568 		break;
569 	case 96000:
570 		emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
571 		break;
572 	case 176400:
573 		emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
574 		break;
575 	case 192000:
576 		emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
577 		break;
578 	default:
579 		emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
580 		break;
581 	}
582 	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
583 }
584 
585 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
586 			      struct audioformat *fmt)
587 {
588 	switch (subs->stream->chip->usb_id) {
589 	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
590 	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
591 	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
592 		set_format_emu_quirk(subs, fmt);
593 		break;
594 	}
595 }
596 
597