sound/usb/quirks.c - kernel/msm-4.9 - Gitiles

 /*
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
  *   (at your option) any later version.
  *
  *   This program is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */

 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/usb/audio.h>

 #include <sound/control.h>
 #include <sound/core.h>
 #include <sound/info.h>
 #include <sound/pcm.h>

 #include "usbaudio.h"
 #include "card.h"
 #include "mixer.h"
 #include "mixer_quirks.h"
 #include "midi.h"
 #include "quirks.h"
 #include "helper.h"
 #include "endpoint.h"
 #include "pcm.h"
 #include "clock.h"

 /*
  * handle the quirks for the contained interfaces
  */
 static int create_composite_quirk(struct snd_usb_audio *chip,
 				  struct usb_interface *iface,
 				  struct usb_driver *driver,
 				  const struct snd_usb_audio_quirk *quirk)
 {
 	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
 	int err;

 	for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
 		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
 		if (!iface)
 			continue;
 		if (quirk->ifnum != probed_ifnum &&
 		    usb_interface_claimed(iface))
 			continue;
 		err = snd_usb_create_quirk(chip, iface, driver, quirk);
 		if (err < 0)
 			return err;
 		if (quirk->ifnum != probed_ifnum)
 			usb_driver_claim_interface(driver, iface, (void *)-1L);
 	}
 	return 0;
 }

 static int ignore_interface_quirk(struct snd_usb_audio *chip,
 				  struct usb_interface *iface,
 				  struct usb_driver *driver,
 				  const struct snd_usb_audio_quirk *quirk)
 {
 	return 0;
 }


 /*
  * Allow alignment on audio sub-slot (channel samples) rather than
  * on audio slots (audio frames)
  */
 static int create_align_transfer_quirk(struct snd_usb_audio *chip,
 				       struct usb_interface *iface,
 				       struct usb_driver *driver,
 				       const struct snd_usb_audio_quirk *quirk)
 {
 	chip->txfr_quirk = 1;
 	return 1;	/* Continue with creating streams and mixer */
 }

 static int create_any_midi_quirk(struct snd_usb_audio *chip,
 				 struct usb_interface *intf,
 				 struct usb_driver *driver,
 				 const struct snd_usb_audio_quirk *quirk)
 {
 	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
 }

 /*
  * create a stream for an interface with proper descriptors
  */
 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
 				       struct usb_interface *iface,
 				       struct usb_driver *driver,
 				       const struct snd_usb_audio_quirk *quirk)
 {
 	struct usb_host_interface *alts;
 	struct usb_interface_descriptor *altsd;
 	int err;

 	alts = &iface->altsetting[0];
 	altsd = get_iface_desc(alts);
 	err = snd_usb_parse_audio_endpoints(chip, altsd->bInterfaceNumber);
 	if (err < 0) {
 		snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
 			   altsd->bInterfaceNumber, err);
 		return err;
 	}
 	/* reset the current interface */
 	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
 	return 0;
 }

 /*
  * create a stream for an endpoint/altsetting without proper descriptors
  */
 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 				     struct usb_interface *iface,
 				     struct usb_driver *driver,
 				     const struct snd_usb_audio_quirk *quirk)
 {
 	struct audioformat *fp;
 	struct usb_host_interface *alts;
 	int stream, err;
 	unsigned *rate_table = NULL;

 	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
 	if (! fp) {
 		snd_printk(KERN_ERR "cannot memdup\n");
 		return -ENOMEM;
 	}
 	if (fp->nr_rates > 0) {
 		rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
 		if (!rate_table) {
 			kfree(fp);
 			return -ENOMEM;
 		}
 		memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
 		fp->rate_table = rate_table;
 	}

 	stream = (fp->endpoint & USB_DIR_IN)
 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 	err = snd_usb_add_audio_endpoint(chip, stream, fp);
 	if (err < 0) {
 		kfree(fp);
 		kfree(rate_table);
 		return err;
 	}
 	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
 	    fp->altset_idx >= iface->num_altsetting) {
 		kfree(fp);
 		kfree(rate_table);
 		return -EINVAL;
 	}
 	alts = &iface->altsetting[fp->altset_idx];
 	fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 	usb_set_interface(chip->dev, fp->iface, 0);
 	snd_usb_init_pitch(chip, fp->iface, alts, fp);
 	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
 	return 0;
 }

 /*
  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
  * The only way to detect the sample rate is by looking at wMaxPacketSize.
  */
 static int create_uaxx_quirk(struct snd_usb_audio *chip,
 			     struct usb_interface *iface,
 			     struct usb_driver *driver,
 			     const struct snd_usb_audio_quirk *quirk)
 {
 	static const struct audioformat ua_format = {
 		.formats = SNDRV_PCM_FMTBIT_S24_3LE,
 		.channels = 2,
 		.fmt_type = UAC_FORMAT_TYPE_I,
 		.altsetting = 1,
 		.altset_idx = 1,
 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
 	};
 	struct usb_host_interface *alts;
 	struct usb_interface_descriptor *altsd;
 	struct audioformat *fp;
 	int stream, err;

 	/* both PCM and MIDI interfaces have 2 or more altsettings */
 	if (iface->num_altsetting < 2)
 		return -ENXIO;
 	alts = &iface->altsetting[1];
 	altsd = get_iface_desc(alts);

 	if (altsd->bNumEndpoints == 2) {
 		static const struct snd_usb_midi_endpoint_info ua700_ep = {
 			.out_cables = 0x0003,
 			.in_cables  = 0x0003
 		};
 		static const struct snd_usb_audio_quirk ua700_quirk = {
 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
 			.data = &ua700_ep
 		};
 		static const struct snd_usb_midi_endpoint_info uaxx_ep = {
 			.out_cables = 0x0001,
 			.in_cables  = 0x0001
 		};
 		static const struct snd_usb_audio_quirk uaxx_quirk = {
 			.type = QUIRK_MIDI_FIXED_ENDPOINT,
 			.data = &uaxx_ep
 		};
 		const struct snd_usb_audio_quirk *quirk =
 			chip->usb_id == USB_ID(0x0582, 0x002b)
 			? &ua700_quirk : &uaxx_quirk;
 		return snd_usbmidi_create(chip->card, iface,
 					  &chip->midi_list, quirk);
 	}

 	if (altsd->bNumEndpoints != 1)
 		return -ENXIO;

 	fp = kmalloc(sizeof(*fp), GFP_KERNEL);
 	if (!fp)
 		return -ENOMEM;
 	memcpy(fp, &ua_format, sizeof(*fp));

 	fp->iface = altsd->bInterfaceNumber;
 	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 	fp->datainterval = 0;
 	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);

 	switch (fp->maxpacksize) {
 	case 0x120:
 		fp->rate_max = fp->rate_min = 44100;
 		break;
 	case 0x138:
 	case 0x140:
 		fp->rate_max = fp->rate_min = 48000;
 		break;
 	case 0x258:
 	case 0x260:
 		fp->rate_max = fp->rate_min = 96000;
 		break;
 	default:
 		snd_printk(KERN_ERR "unknown sample rate\n");
 		kfree(fp);
 		return -ENXIO;
 	}

 	stream = (fp->endpoint & USB_DIR_IN)
 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 	err = snd_usb_add_audio_endpoint(chip, stream, fp);
 	if (err < 0) {
 		kfree(fp);
 		return err;
 	}
 	usb_set_interface(chip->dev, fp->iface, 0);
 	return 0;
 }

 /*
  * Create a standard mixer for the specified interface.
  */
 static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
 				       struct usb_interface *iface,
 				       struct usb_driver *driver,
 				       const struct snd_usb_audio_quirk *quirk)
 {
 	if (quirk->ifnum < 0)
 		return 0;

 	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
 }

 /*
  * audio-interface quirks
  *
  * returns zero if no standard audio/MIDI parsing is needed.
  * returns a positive value if standard audio/midi interfaces are parsed
  * after this.
  * returns a negative value at error.
  */
 int snd_usb_create_quirk(struct snd_usb_audio *chip,
 			 struct usb_interface *iface,
 			 struct usb_driver *driver,
 			 const struct snd_usb_audio_quirk *quirk)
 {
 	typedef int (*quirk_func_t)(struct snd_usb_audio *,
 				    struct usb_interface *,
 				    struct usb_driver *,
 				    const struct snd_usb_audio_quirk *);
 	static const quirk_func_t quirk_funcs[] = {
 		[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
 		[QUIRK_COMPOSITE] = create_composite_quirk,
 		[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
 		[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
 		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
 		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
 		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
 		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
 		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
 		[QUIRK_MIDI_CME] = create_any_midi_quirk,
 		[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
 		[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
 		[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
 		[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
 	};

 	if (quirk->type < QUIRK_TYPE_COUNT) {
 		return quirk_funcs[quirk->type](chip, iface, driver, quirk);
 	} else {
 		snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
 		return -ENXIO;
 	}
 }

 /*
  * boot quirks
  */

 #define EXTIGY_FIRMWARE_SIZE_OLD 794
 #define EXTIGY_FIRMWARE_SIZE_NEW 483

 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
 {
 	struct usb_host_config *config = dev->actconfig;
 	int err;

 	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
 	    le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
 		snd_printdd("sending Extigy boot sequence...\n");
 		/* Send message to force it to reconnect with full interface. */
 		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
 				      0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
 		if (err < 0) snd_printdd("error sending boot message: %d\n", err);
 		err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 				&dev->descriptor, sizeof(dev->descriptor));
 		config = dev->actconfig;
 		if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
 		err = usb_reset_configuration(dev);
 		if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
 		snd_printdd("extigy_boot: new boot length = %d\n",
 			    le16_to_cpu(get_cfg_desc(config)->wTotalLength));
 		return -ENODEV; /* quit this anyway */
 	}
 	return 0;
 }

 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
 {
 	u8 buf = 1;

 	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 			0, 0, &buf, 1, 1000);
 	if (buf == 0) {
 		snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
 				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 				1, 2000, NULL, 0, 1000);
 		return -ENODEV;
 	}
 	return 0;
 }

 /*
  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
  * documented in the device's data sheet.
  */
 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
 {
 	u8 buf[4];
 	buf[0] = 0x20;
 	buf[1] = value & 0xff;
 	buf[2] = (value >> 8) & 0xff;
 	buf[3] = reg;
 	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
 			       USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
 			       0, 0, &buf, 4, 1000);
 }

 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
 {
 	/*
 	 * Enable line-out driver mode, set headphone source to front
 	 * channels, enable stereo mic.
 	 */
 	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
 }

 /*
  * C-Media CM6206 is based on CM106 with two additional
  * registers that are not documented in the data sheet.
  * Values here are chosen based on sniffing USB traffic
  * under Windows.
  */
 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
 {
 	int err, reg;
 	int val[] = {0x2004, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};

 	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
 		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
 		if (err < 0)
 			return err;
 	}

 	return err;
 }

 /*
  * This call will put the synth in "USB send" mode, i.e it will send MIDI
  * messages through USB (this is disabled at startup). The synth will
  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
  * sign on its LCD. Values here are chosen based on sniffing USB traffic
  * under Windows.
  */
 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
 {
 	int err, actual_length;

 	/* "midi send" enable */
 	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };

 	void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
 			ARRAY_SIZE(seq), &actual_length, 1000);
 	kfree(buf);
 	if (err < 0)
 		return err;

 	return 0;
 }

 /*
  * Some sound cards from Native Instruments are in fact compliant to the USB
  * audio standard of version 2 and other approved USB standards, even though
  * they come up as vendor-specific device when first connected.
  *
  * However, they can be told to come up with a new set of descriptors
  * upon their next enumeration, and the interfaces announced by the new
  * descriptors will then be handled by the kernel's class drivers. As the
  * product ID will also change, no further checks are required.
  */

 static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
 {
 	int ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 				  0xaf, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 				  cpu_to_le16(1), 0, NULL, 0, 1000);

 	if (ret < 0)
 		return ret;

 	usb_reset_device(dev);

 	/* return -EAGAIN, so the creation of an audio interface for this
 	 * temporary device is aborted. The device will reconnect with a
 	 * new product ID */
 	return -EAGAIN;
 }

 /*
  * Setup quirks
  */
 #define AUDIOPHILE_SET			0x01 /* if set, parse device_setup */
 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
 #define AUDIOPHILE_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
 #define AUDIOPHILE_SET_DI		0x10 /* if set, enable Digital Input */
 #define AUDIOPHILE_SET_MASK		0x1F /* bit mask for setup value */
 #define AUDIOPHILE_SET_24B_48K_DI	0x19 /* value for 24bits+48KHz+Digital Input */
 #define AUDIOPHILE_SET_24B_48K_NOTDI	0x09 /* value for 24bits+48KHz+No Digital Input */
 #define AUDIOPHILE_SET_16B_48K_DI	0x11 /* value for 16bits+48KHz+Digital Input */
 #define AUDIOPHILE_SET_16B_48K_NOTDI	0x01 /* value for 16bits+48KHz+No Digital Input */

 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
 					 int iface,
 					 int altno)
 {
 	/* Reset ALL ifaces to 0 altsetting.
 	 * Call it for every possible altsetting of every interface.
 	 */
 	usb_set_interface(chip->dev, iface, 0);

 	if (chip->setup & AUDIOPHILE_SET) {
 		if ((chip->setup & AUDIOPHILE_SET_DTS)
 		    && altno != 6)
 			return 1; /* skip this altsetting */
 		if ((chip->setup & AUDIOPHILE_SET_96K)
 		    && altno != 1)
 			return 1; /* skip this altsetting */
 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 		    AUDIOPHILE_SET_24B_48K_DI && altno != 2)
 			return 1; /* skip this altsetting */
 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 		    AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
 			return 1; /* skip this altsetting */
 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 		    AUDIOPHILE_SET_16B_48K_DI && altno != 4)
 			return 1; /* skip this altsetting */
 		if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 		    AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
 			return 1; /* skip this altsetting */
 	}

 	return 0; /* keep this altsetting */
 }

 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
 				  int iface,
 				  int altno)
 {
 	/* audiophile usb: skip altsets incompatible with device_setup */
 	if (chip->usb_id == USB_ID(0x0763, 0x2003))
 		return audiophile_skip_setting_quirk(chip, iface, altno);

 	return 0;
 }

 int snd_usb_apply_boot_quirk(struct usb_device *dev,
 			     struct usb_interface *intf,
 			     const struct snd_usb_audio_quirk *quirk)
 {
 	u32 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 			le16_to_cpu(dev->descriptor.idProduct));

 	switch (id) {
 	case USB_ID(0x041e, 0x3000):
 		/* SB Extigy needs special boot-up sequence */
 		/* if more models come, this will go to the quirk list. */
 		return snd_usb_extigy_boot_quirk(dev, intf);

 	case USB_ID(0x041e, 0x3020):
 		/* SB Audigy 2 NX needs its own boot-up magic, too */
 		return snd_usb_audigy2nx_boot_quirk(dev);

 	case USB_ID(0x10f5, 0x0200):
 		/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
 		return snd_usb_cm106_boot_quirk(dev);

 	case USB_ID(0x0d8c, 0x0102):
 		/* C-Media CM6206 / CM106-Like Sound Device */
 	case USB_ID(0x0ccd, 0x00b1): /* Terratec Aureon 7.1 USB */
 		return snd_usb_cm6206_boot_quirk(dev);

 	case USB_ID(0x133e, 0x0815):
 		/* Access Music VirusTI Desktop */
 		return snd_usb_accessmusic_boot_quirk(dev);

 	case USB_ID(0x17cc, 0x1000): /* Komplete Audio 6 */
 	case USB_ID(0x17cc, 0x1010): /* Traktor Audio 6 */
 	case USB_ID(0x17cc, 0x1020): /* Traktor Audio 10 */
 		return snd_usb_nativeinstruments_boot_quirk(dev);
 	}

 	return 0;
 }

 /*
  * check if the device uses big-endian samples
  */
 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
 {
 	switch (chip->usb_id) {
 	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
 		if (fp->endpoint & USB_DIR_IN)
 			return 1;
 		break;
 	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 		if (chip->setup == 0x00 ||
 		    fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
 			return 1;
 	}
 	return 0;
 }

 /*
  * For E-Mu 0404USB/0202USB/TrackerPre/0204 sample rate should be set for device,
  * not for interface.
  */

 enum {
 	EMU_QUIRK_SR_44100HZ = 0,
 	EMU_QUIRK_SR_48000HZ,
 	EMU_QUIRK_SR_88200HZ,
 	EMU_QUIRK_SR_96000HZ,
 	EMU_QUIRK_SR_176400HZ,
 	EMU_QUIRK_SR_192000HZ
 };

 static void set_format_emu_quirk(struct snd_usb_substream *subs,
 				 struct audioformat *fmt)
 {
 	unsigned char emu_samplerate_id = 0;

 	/* When capture is active
 	 * sample rate shouldn't be changed
 	 * by playback substream
 	 */
 	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
 		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
 			return;
 	}

 	switch (fmt->rate_min) {
 	case 48000:
 		emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
 		break;
 	case 88200:
 		emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
 		break;
 	case 96000:
 		emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
 		break;
 	case 176400:
 		emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
 		break;
 	case 192000:
 		emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
 		break;
 	default:
 		emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
 		break;
 	}
 	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
 }

 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 			      struct audioformat *fmt)
 {
 	switch (subs->stream->chip->usb_id) {
 	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
 	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
 	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
 	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
 		set_format_emu_quirk(subs, fmt);
 		break;
 	}
 }
	/*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/usb.h>
	#include <linux/usb/audio.h>

	#include <sound/control.h>
	#include <sound/core.h>
	#include <sound/info.h>
	#include <sound/pcm.h>

	#include "usbaudio.h"
	#include "card.h"
	#include "mixer.h"
	#include "mixer_quirks.h"
	#include "midi.h"
	#include "quirks.h"
	#include "helper.h"
	#include "endpoint.h"
	#include "pcm.h"
	#include "clock.h"

	/*
	* handle the quirks for the contained interfaces
	*/
	static int create_composite_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
	int err;

	for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
	iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
	if (!iface)
	continue;
	if (quirk->ifnum != probed_ifnum &&
	usb_interface_claimed(iface))
	continue;
	err = snd_usb_create_quirk(chip, iface, driver, quirk);
	if (err < 0)
	return err;
	if (quirk->ifnum != probed_ifnum)
	usb_driver_claim_interface(driver, iface, (void *)-1L);
	}
	return 0;
	}

	static int ignore_interface_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	return 0;
	}


	/*
	* Allow alignment on audio sub-slot (channel samples) rather than
	* on audio slots (audio frames)
	*/
	static int create_align_transfer_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	chip->txfr_quirk = 1;
	return 1; /* Continue with creating streams and mixer */
	}

	static int create_any_midi_quirk(struct snd_usb_audio *chip,
	struct usb_interface *intf,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
	}

	/*
	* create a stream for an interface with proper descriptors
	*/
	static int create_standard_audio_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	int err;

	alts = &iface->altsetting[0];
	altsd = get_iface_desc(alts);
	err = snd_usb_parse_audio_endpoints(chip, altsd->bInterfaceNumber);
	if (err < 0) {
	snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
	altsd->bInterfaceNumber, err);
	return err;
	}
	/* reset the current interface */
	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
	return 0;
	}

	/*
	* create a stream for an endpoint/altsetting without proper descriptors
	*/
	static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	struct audioformat *fp;
	struct usb_host_interface *alts;
	int stream, err;
	unsigned *rate_table = NULL;

	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
	if (! fp) {
	snd_printk(KERN_ERR "cannot memdup\n");
	return -ENOMEM;
	}
	if (fp->nr_rates > 0) {
	rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
	if (!rate_table) {
	kfree(fp);
	return -ENOMEM;
	}
	memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
	fp->rate_table = rate_table;
	}

	stream = (fp->endpoint & USB_DIR_IN)
	? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
	err = snd_usb_add_audio_endpoint(chip, stream, fp);
	if (err < 0) {
	kfree(fp);
	kfree(rate_table);
	return err;
	}
	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber \|\|
	fp->altset_idx >= iface->num_altsetting) {
	kfree(fp);
	kfree(rate_table);
	return -EINVAL;
	}
	alts = &iface->altsetting[fp->altset_idx];
	fp->datainterval = snd_usb_parse_datainterval(chip, alts);
	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
	usb_set_interface(chip->dev, fp->iface, 0);
	snd_usb_init_pitch(chip, fp->iface, alts, fp);
	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
	return 0;
	}

	/*
	* Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
	* The only way to detect the sample rate is by looking at wMaxPacketSize.
	*/
	static int create_uaxx_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	static const struct audioformat ua_format = {
	.formats = SNDRV_PCM_FMTBIT_S24_3LE,
	.channels = 2,
	.fmt_type = UAC_FORMAT_TYPE_I,
	.altsetting = 1,
	.altset_idx = 1,
	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	};
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct audioformat *fp;
	int stream, err;

	/* both PCM and MIDI interfaces have 2 or more altsettings */
	if (iface->num_altsetting < 2)
	return -ENXIO;
	alts = &iface->altsetting[1];
	altsd = get_iface_desc(alts);

	if (altsd->bNumEndpoints == 2) {
	static const struct snd_usb_midi_endpoint_info ua700_ep = {
	.out_cables = 0x0003,
	.in_cables = 0x0003
	};
	static const struct snd_usb_audio_quirk ua700_quirk = {
	.type = QUIRK_MIDI_FIXED_ENDPOINT,
	.data = &ua700_ep
	};
	static const struct snd_usb_midi_endpoint_info uaxx_ep = {
	.out_cables = 0x0001,
	.in_cables = 0x0001
	};
	static const struct snd_usb_audio_quirk uaxx_quirk = {
	.type = QUIRK_MIDI_FIXED_ENDPOINT,
	.data = &uaxx_ep
	};
	const struct snd_usb_audio_quirk *quirk =
	chip->usb_id == USB_ID(0x0582, 0x002b)
	? &ua700_quirk : &uaxx_quirk;
	return snd_usbmidi_create(chip->card, iface,
	&chip->midi_list, quirk);
	}

	if (altsd->bNumEndpoints != 1)
	return -ENXIO;

	fp = kmalloc(sizeof(*fp), GFP_KERNEL);
	if (!fp)
	return -ENOMEM;
	memcpy(fp, &ua_format, sizeof(*fp));

	fp->iface = altsd->bInterfaceNumber;
	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
	fp->datainterval = 0;
	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);

	switch (fp->maxpacksize) {
	case 0x120:
	fp->rate_max = fp->rate_min = 44100;
	break;
	case 0x138:
	case 0x140:
	fp->rate_max = fp->rate_min = 48000;
	break;
	case 0x258:
	case 0x260:
	fp->rate_max = fp->rate_min = 96000;
	break;
	default:
	snd_printk(KERN_ERR "unknown sample rate\n");
	kfree(fp);
	return -ENXIO;
	}

	stream = (fp->endpoint & USB_DIR_IN)
	? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
	err = snd_usb_add_audio_endpoint(chip, stream, fp);
	if (err < 0) {
	kfree(fp);
	return err;
	}
	usb_set_interface(chip->dev, fp->iface, 0);
	return 0;
	}

	/*
	* Create a standard mixer for the specified interface.
	*/
	static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	if (quirk->ifnum < 0)
	return 0;

	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
	}

	/*
	* audio-interface quirks
	*
	* returns zero if no standard audio/MIDI parsing is needed.
	* returns a positive value if standard audio/midi interfaces are parsed
	* after this.
	* returns a negative value at error.
	*/
	int snd_usb_create_quirk(struct snd_usb_audio *chip,
	struct usb_interface *iface,
	struct usb_driver *driver,
	const struct snd_usb_audio_quirk *quirk)
	{
	typedef int (quirk_func_t)(struct snd_usb_audio ,
	struct usb_interface *,
	struct usb_driver *,
	const struct snd_usb_audio_quirk *);
	static const quirk_func_t quirk_funcs[] = {
	[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
	[QUIRK_COMPOSITE] = create_composite_quirk,
	[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
	[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
	[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
	[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
	[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
	[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
	[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
	[QUIRK_MIDI_CME] = create_any_midi_quirk,
	[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
	[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
	[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
	[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
	[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
	[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
	};

	if (quirk->type < QUIRK_TYPE_COUNT) {
	return quirk_funcs[quirk->type](chip, iface, driver, quirk);
	} else {
	snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
	return -ENXIO;
	}
	}

	/*
	* boot quirks
	*/

	#define EXTIGY_FIRMWARE_SIZE_OLD 794
	#define EXTIGY_FIRMWARE_SIZE_NEW 483

	static int snd_usb_extigy_boot_quirk(struct usb_device dev, struct usb_interface intf)
	{
	struct usb_host_config *config = dev->actconfig;
	int err;

	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD \|\|
	le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
	snd_printdd("sending Extigy boot sequence...\n");
	/* Send message to force it to reconnect with full interface. */
	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
	0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
	if (err < 0) snd_printdd("error sending boot message: %d\n", err);
	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
	&dev->descriptor, sizeof(dev->descriptor));
	config = dev->actconfig;
	if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
	err = usb_reset_configuration(dev);
	if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
	snd_printdd("extigy_boot: new boot length = %d\n",
	le16_to_cpu(get_cfg_desc(config)->wTotalLength));
	return -ENODEV; /* quit this anyway */
	}
	return 0;
	}

	static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
	{
	u8 buf = 1;

	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_OTHER,
	0, 0, &buf, 1, 1000);
	if (buf == 0) {
	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_OTHER,
	1, 2000, NULL, 0, 1000);
	return -ENODEV;
	}
	return 0;
	}

	/*
	* C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
	* documented in the device's data sheet.
	*/
	static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
	{
	u8 buf[4];
	buf[0] = 0x20;
	buf[1] = value & 0xff;
	buf[2] = (value >> 8) & 0xff;
	buf[3] = reg;
	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
	USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_ENDPOINT,
	0, 0, &buf, 4, 1000);
	}

	static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
	{
	/*
	* Enable line-out driver mode, set headphone source to front
	* channels, enable stereo mic.
	*/
	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
	}

	/*
	* C-Media CM6206 is based on CM106 with two additional
	* registers that are not documented in the data sheet.
	* Values here are chosen based on sniffing USB traffic
	* under Windows.
	*/
	static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
	{
	int err, reg;
	int val[] = {0x2004, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};

	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
	err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
	if (err < 0)
	return err;
	}

	return err;
	}

	/*
	* This call will put the synth in "USB send" mode, i.e it will send MIDI
	* messages through USB (this is disabled at startup). The synth will
	* acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
	* sign on its LCD. Values here are chosen based on sniffing USB traffic
	* under Windows.
	*/
	static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
	{
	int err, actual_length;

	/* "midi send" enable */
	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };

	void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
	if (!buf)
	return -ENOMEM;
	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
	ARRAY_SIZE(seq), &actual_length, 1000);
	kfree(buf);
	if (err < 0)
	return err;

	return 0;
	}

	/*
	* Some sound cards from Native Instruments are in fact compliant to the USB
	* audio standard of version 2 and other approved USB standards, even though
	* they come up as vendor-specific device when first connected.
	*
	* However, they can be told to come up with a new set of descriptors
	* upon their next enumeration, and the interfaces announced by the new
	* descriptors will then be handled by the kernel's class drivers. As the
	* product ID will also change, no further checks are required.
	*/

	static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
	{
	int ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	0xaf, USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	cpu_to_le16(1), 0, NULL, 0, 1000);

	if (ret < 0)
	return ret;

	usb_reset_device(dev);

	/* return -EAGAIN, so the creation of an audio interface for this
	* temporary device is aborted. The device will reconnect with a
	* new product ID */
	return -EAGAIN;
	}

	/*
	* Setup quirks
	*/
	#define AUDIOPHILE_SET 0x01 /* if set, parse device_setup */
	#define AUDIOPHILE_SET_DTS 0x02 /* if set, enable DTS Digital Output */
	#define AUDIOPHILE_SET_96K 0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
	#define AUDIOPHILE_SET_24B 0x08 /* 24bits sample if set, 16bits otherwise */
	#define AUDIOPHILE_SET_DI 0x10 /* if set, enable Digital Input */
	#define AUDIOPHILE_SET_MASK 0x1F /* bit mask for setup value */
	#define AUDIOPHILE_SET_24B_48K_DI 0x19 /* value for 24bits+48KHz+Digital Input */
	#define AUDIOPHILE_SET_24B_48K_NOTDI 0x09 /* value for 24bits+48KHz+No Digital Input */
	#define AUDIOPHILE_SET_16B_48K_DI 0x11 /* value for 16bits+48KHz+Digital Input */
	#define AUDIOPHILE_SET_16B_48K_NOTDI 0x01 /* value for 16bits+48KHz+No Digital Input */

	static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
	int iface,
	int altno)
	{
	/* Reset ALL ifaces to 0 altsetting.
	* Call it for every possible altsetting of every interface.
	*/
	usb_set_interface(chip->dev, iface, 0);

	if (chip->setup & AUDIOPHILE_SET) {
	if ((chip->setup & AUDIOPHILE_SET_DTS)
	&& altno != 6)
	return 1; /* skip this altsetting */
	if ((chip->setup & AUDIOPHILE_SET_96K)
	&& altno != 1)
	return 1; /* skip this altsetting */
	if ((chip->setup & AUDIOPHILE_SET_MASK) ==
	AUDIOPHILE_SET_24B_48K_DI && altno != 2)
	return 1; /* skip this altsetting */
	if ((chip->setup & AUDIOPHILE_SET_MASK) ==
	AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
	return 1; /* skip this altsetting */
	if ((chip->setup & AUDIOPHILE_SET_MASK) ==
	AUDIOPHILE_SET_16B_48K_DI && altno != 4)
	return 1; /* skip this altsetting */
	if ((chip->setup & AUDIOPHILE_SET_MASK) ==
	AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
	return 1; /* skip this altsetting */
	}

	return 0; /* keep this altsetting */
	}

	int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
	int iface,
	int altno)
	{
	/* audiophile usb: skip altsets incompatible with device_setup */
	if (chip->usb_id == USB_ID(0x0763, 0x2003))
	return audiophile_skip_setting_quirk(chip, iface, altno);

	return 0;
	}

	int snd_usb_apply_boot_quirk(struct usb_device *dev,
	struct usb_interface *intf,
	const struct snd_usb_audio_quirk *quirk)
	{
	u32 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
	le16_to_cpu(dev->descriptor.idProduct));

	switch (id) {
	case USB_ID(0x041e, 0x3000):
	/* SB Extigy needs special boot-up sequence */
	/* if more models come, this will go to the quirk list. */
	return snd_usb_extigy_boot_quirk(dev, intf);

	case USB_ID(0x041e, 0x3020):
	/* SB Audigy 2 NX needs its own boot-up magic, too */
	return snd_usb_audigy2nx_boot_quirk(dev);

	case USB_ID(0x10f5, 0x0200):
	/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
	return snd_usb_cm106_boot_quirk(dev);

	case USB_ID(0x0d8c, 0x0102):
	/* C-Media CM6206 / CM106-Like Sound Device */
	case USB_ID(0x0ccd, 0x00b1): /* Terratec Aureon 7.1 USB */
	return snd_usb_cm6206_boot_quirk(dev);

	case USB_ID(0x133e, 0x0815):
	/* Access Music VirusTI Desktop */
	return snd_usb_accessmusic_boot_quirk(dev);

	case USB_ID(0x17cc, 0x1000): /* Komplete Audio 6 */
	case USB_ID(0x17cc, 0x1010): /* Traktor Audio 6 */
	case USB_ID(0x17cc, 0x1020): /* Traktor Audio 10 */
	return snd_usb_nativeinstruments_boot_quirk(dev);
	}

	return 0;
	}

	/*
	* check if the device uses big-endian samples
	*/
	int snd_usb_is_big_endian_format(struct snd_usb_audio chip, struct audioformat fp)
	{
	switch (chip->usb_id) {
	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
	if (fp->endpoint & USB_DIR_IN)
	return 1;
	break;
	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
	if (chip->setup == 0x00 \|\|
	fp->altsetting==1 \|\| fp->altsetting==2 \|\| fp->altsetting==3)
	return 1;
	}
	return 0;
	}

	/*
	* For E-Mu 0404USB/0202USB/TrackerPre/0204 sample rate should be set for device,
	* not for interface.
	*/

	enum {
	EMU_QUIRK_SR_44100HZ = 0,
	EMU_QUIRK_SR_48000HZ,
	EMU_QUIRK_SR_88200HZ,
	EMU_QUIRK_SR_96000HZ,
	EMU_QUIRK_SR_176400HZ,
	EMU_QUIRK_SR_192000HZ
	};

	static void set_format_emu_quirk(struct snd_usb_substream *subs,
	struct audioformat *fmt)
	{
	unsigned char emu_samplerate_id = 0;

	/* When capture is active
	* sample rate shouldn't be changed
	* by playback substream
	*/
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
	if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
	return;
	}

	switch (fmt->rate_min) {
	case 48000:
	emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
	break;
	case 88200:
	emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
	break;
	case 96000:
	emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
	break;
	case 176400:
	emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
	break;
	case 192000:
	emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
	break;
	default:
	emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
	break;
	}
	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
	}

	void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
	struct audioformat *fmt)
	{
	switch (subs->stream->chip->usb_id) {
	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
	set_format_emu_quirk(subs, fmt);
	break;
	}
	}