ALSA: usbmixer: rename usbmixer.[ch] -> mixer.[ch]

For clearer namespace, also rename usbmixer_maps.c -> mixer_maps.c

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 0 insertions, 1920 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
deleted file mode 100644
index ec2436e95321..000000000000
--- a/sound/usb/usbmixer.c
+++ /dev/null
@@ -1,1920 +0,0 @@
-/*
- *   (Tentative) USB Audio Driver for ALSA
- *
- *   Mixer control part
- *
- *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
- *
- *   Many codes borrowed from audio.c by
- *	    Alan Cox (alan@lxorguk.ukuu.org.uk)
- *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
- *
- *
- *   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/bitops.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/usb.h>
-#include <linux/usb/audio.h>
-
-#include <sound/core.h>
-#include <sound/control.h>
-#include <sound/hwdep.h>
-#include <sound/info.h>
-#include <sound/tlv.h>
-
-#include "usbaudio.h"
-#include "usbmixer.h"
-#include "helper.h"
-#include "mixer_quirks.h"
-
-#define MAX_ID_ELEMS	256
-
-struct usb_audio_term {
-	int id;
-	int type;
-	int channels;
-	unsigned int chconfig;
-	int name;
-};
-
-struct usbmix_name_map;
-
-struct mixer_build {
-	struct snd_usb_audio *chip;
-	struct usb_mixer_interface *mixer;
-	unsigned char *buffer;
-	unsigned int buflen;
-	DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
-	struct usb_audio_term oterm;
-	const struct usbmix_name_map *map;
-	const struct usbmix_selector_map *selector_map;
-};
-
-enum {
-	USB_MIXER_BOOLEAN,
-	USB_MIXER_INV_BOOLEAN,
-	USB_MIXER_S8,
-	USB_MIXER_U8,
-	USB_MIXER_S16,
-	USB_MIXER_U16,
-};
-
-enum {
-	USB_PROC_UPDOWN = 1,
-	USB_PROC_UPDOWN_SWITCH = 1,
-	USB_PROC_UPDOWN_MODE_SEL = 2,
-
-	USB_PROC_PROLOGIC = 2,
-	USB_PROC_PROLOGIC_SWITCH = 1,
-	USB_PROC_PROLOGIC_MODE_SEL = 2,
-
-	USB_PROC_3DENH = 3,
-	USB_PROC_3DENH_SWITCH = 1,
-	USB_PROC_3DENH_SPACE = 2,
-
-	USB_PROC_REVERB = 4,
-	USB_PROC_REVERB_SWITCH = 1,
-	USB_PROC_REVERB_LEVEL = 2,
-	USB_PROC_REVERB_TIME = 3,
-	USB_PROC_REVERB_DELAY = 4,
-
-	USB_PROC_CHORUS = 5,
-	USB_PROC_CHORUS_SWITCH = 1,
-	USB_PROC_CHORUS_LEVEL = 2,
-	USB_PROC_CHORUS_RATE = 3,
-	USB_PROC_CHORUS_DEPTH = 4,
-
-	USB_PROC_DCR = 6,
-	USB_PROC_DCR_SWITCH = 1,
-	USB_PROC_DCR_RATIO = 2,
-	USB_PROC_DCR_MAX_AMP = 3,
-	USB_PROC_DCR_THRESHOLD = 4,
-	USB_PROC_DCR_ATTACK = 5,
-	USB_PROC_DCR_RELEASE = 6,
-};
-
-/*E-mu 0202(0404) eXtension Unit(XU) control*/
-enum {
-	USB_XU_CLOCK_RATE 		= 0xe301,
-	USB_XU_CLOCK_SOURCE		= 0xe302,
-	USB_XU_DIGITAL_IO_STATUS	= 0xe303,
-	USB_XU_DEVICE_OPTIONS		= 0xe304,
-	USB_XU_DIRECT_MONITORING	= 0xe305,
-	USB_XU_METERING			= 0xe306
-};
-enum {
-	USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,	/* clock source*/
-	USB_XU_CLOCK_RATE_SELECTOR = 0x03,	/* clock rate */
-	USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,	/* the spdif format */
-	USB_XU_SOFT_LIMIT_SELECTOR = 0x03	/* soft limiter */
-};
-
-/*
- * manual mapping of mixer names
- * if the mixer topology is too complicated and the parsed names are
- * ambiguous, add the entries in usbmixer_maps.c.
- */
-#include "usbmixer_maps.c"
-
-static const struct usbmix_name_map *
-find_map(struct mixer_build *state, int unitid, int control)
-{
-	const struct usbmix_name_map *p = state->map;
-
-	if (!p)
-		return NULL;
-
-	for (p = state->map; p->id; p++) {
-		if (p->id == unitid &&
-		    (!control || !p->control || control == p->control))
-			return p;
-	}
-	return NULL;
-}
-
-/* get the mapped name if the unit matches */
-static int
-check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
-{
-	if (!p || !p->name)
-		return 0;
-
-	buflen--;
-	return strlcpy(buf, p->name, buflen);
-}
-
-/* check whether the control should be ignored */
-static inline int
-check_ignored_ctl(const struct usbmix_name_map *p)
-{
-	if (!p || p->name || p->dB)
-		return 0;
-	return 1;
-}
-
-/* dB mapping */
-static inline void check_mapped_dB(const struct usbmix_name_map *p,
-				   struct usb_mixer_elem_info *cval)
-{
-	if (p && p->dB) {
-		cval->dBmin = p->dB->min;
-		cval->dBmax = p->dB->max;
-	}
-}
-
-/* get the mapped selector source name */
-static int check_mapped_selector_name(struct mixer_build *state, int unitid,
-				      int index, char *buf, int buflen)
-{
-	const struct usbmix_selector_map *p;
-
-	if (! state->selector_map)
-		return 0;
-	for (p = state->selector_map; p->id; p++) {
-		if (p->id == unitid && index < p->count)
-			return strlcpy(buf, p->names[index], buflen);
-	}
-	return 0;
-}
-
-/*
- * find an audio control unit with the given unit id
- */
-static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
-{
-	unsigned char *p;
-
-	p = NULL;
-	while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
-				      USB_DT_CS_INTERFACE)) != NULL) {
-		if (p[0] >= 4 && p[2] >= UAC_INPUT_TERMINAL && p[2] <= UAC_EXTENSION_UNIT_V1 && p[3] == unit)
-			return p;
-	}
-	return NULL;
-}
-
-
-/*
- * copy a string with the given id
- */
-static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
-{
-	int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
-	buf[len] = 0;
-	return len;
-}
-
-/*
- * convert from the byte/word on usb descriptor to the zero-based integer
- */
-static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
-{
-	switch (cval->val_type) {
-	case USB_MIXER_BOOLEAN:
-		return !!val;
-	case USB_MIXER_INV_BOOLEAN:
-		return !val;
-	case USB_MIXER_U8:
-		val &= 0xff;
-		break;
-	case USB_MIXER_S8:
-		val &= 0xff;
-		if (val >= 0x80)
-			val -= 0x100;
-		break;
-	case USB_MIXER_U16:
-		val &= 0xffff;
-		break;
-	case USB_MIXER_S16:
-		val &= 0xffff;
-		if (val >= 0x8000)
-			val -= 0x10000;
-		break;
-	}
-	return val;
-}
-
-/*
- * convert from the zero-based int to the byte/word for usb descriptor
- */
-static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
-{
-	switch (cval->val_type) {
-	case USB_MIXER_BOOLEAN:
-		return !!val;
-	case USB_MIXER_INV_BOOLEAN:
-		return !val;
-	case USB_MIXER_S8:
-	case USB_MIXER_U8:
-		return val & 0xff;
-	case USB_MIXER_S16:
-	case USB_MIXER_U16:
-		return val & 0xffff;
-	}
-	return 0; /* not reached */
-}
-
-static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
-{
-	if (! cval->res)
-		cval->res = 1;
-	if (val < cval->min)
-		return 0;
-	else if (val >= cval->max)
-		return (cval->max - cval->min + cval->res - 1) / cval->res;
-	else
-		return (val - cval->min) / cval->res;
-}
-
-static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
-{
-	if (val < 0)
-		return cval->min;
-	if (! cval->res)
-		cval->res = 1;
-	val *= cval->res;
-	val += cval->min;
-	if (val > cval->max)
-		return cval->max;
-	return val;
-}
-
-
-/*
- * retrieve a mixer value
- */
-
-static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
-{
-	unsigned char buf[2];
-	int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
-	int timeout = 10;
-
-	while (timeout-- > 0) {
-		if (snd_usb_ctl_msg(cval->mixer->chip->dev,
-				    usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
-				    request,
-				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
-				    validx, cval->mixer->ctrlif | (cval->id << 8),
-				    buf, val_len, 100) >= val_len) {
-			*value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
-			return 0;
-		}
-	}
-	snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
-		    request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
-	return -EINVAL;
-}
-
-static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
-{
-	return get_ctl_value(cval, UAC_GET_CUR, validx, value);
-}
-
-/* channel = 0: master, 1 = first channel */
-static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
-				  int channel, int *value)
-{
-	return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
-}
-
-static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
-			     int channel, int index, int *value)
-{
-	int err;
-
-	if (cval->cached & (1 << channel)) {
-		*value = cval->cache_val[index];
-		return 0;
-	}
-	err = get_cur_mix_raw(cval, channel, value);
-	if (err < 0) {
-		if (!cval->mixer->ignore_ctl_error)
-			snd_printd(KERN_ERR "cannot get current value for "
-				   "control %d ch %d: err = %d\n",
-				   cval->control, channel, err);
-		return err;
-	}
-	cval->cached |= 1 << channel;
-	cval->cache_val[index] = *value;
-	return 0;
-}
-
-
-/*
- * set a mixer value
- */
-
-int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
-				int request, int validx, int value_set)
-{
-	unsigned char buf[2];
-	int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
-	int timeout = 10;
-
-	value_set = convert_bytes_value(cval, value_set);
-	buf[0] = value_set & 0xff;
-	buf[1] = (value_set >> 8) & 0xff;
-	while (timeout-- > 0)
-		if (snd_usb_ctl_msg(cval->mixer->chip->dev,
-				    usb_sndctrlpipe(cval->mixer->chip->dev, 0),
-				    request,
-				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
-				    validx, cval->mixer->ctrlif | (cval->id << 8),
-				    buf, val_len, 100) >= 0)
-			return 0;
-	snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
-		    request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
-	return -EINVAL;
-}
-
-static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
-{
-	return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
-}
-
-static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
-			     int index, int value)
-{
-	int err;
-	err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
-			    value);
-	if (err < 0)
-		return err;
-	cval->cached |= 1 << channel;
-	cval->cache_val[index] = value;
-	return 0;
-}
-
-/*
- * TLV callback for mixer volume controls
- */
-static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
-			 unsigned int size, unsigned int __user *_tlv)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	DECLARE_TLV_DB_MINMAX(scale, 0, 0);
-
-	if (size < sizeof(scale))
-		return -ENOMEM;
-	scale[2] = cval->dBmin;
-	scale[3] = cval->dBmax;
-	if (copy_to_user(_tlv, scale, sizeof(scale)))
-		return -EFAULT;
-	return 0;
-}
-
-/*
- * parser routines begin here...
- */
-
-static int parse_audio_unit(struct mixer_build *state, int unitid);
-
-
-/*
- * check if the input/output channel routing is enabled on the given bitmap.
- * used for mixer unit parser
- */
-static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
-{
-	int idx = ich * num_outs + och;
-	return bmap[idx >> 3] & (0x80 >> (idx & 7));
-}
-
-
-/*
- * add an alsa control element
- * search and increment the index until an empty slot is found.
- *
- * if failed, give up and free the control instance.
- */
-
-static int add_control_to_empty(struct mixer_build *state, struct snd_kcontrol *kctl)
-{
-	struct usb_mixer_elem_info *cval = kctl->private_data;
-	int err;
-
-	while (snd_ctl_find_id(state->chip->card, &kctl->id))
-		kctl->id.index++;
-	if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
-		snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
-		return err;
-	}
-	cval->elem_id = &kctl->id;
-	cval->next_id_elem = state->mixer->id_elems[cval->id];
-	state->mixer->id_elems[cval->id] = cval;
-	return 0;
-}
-
-
-/*
- * get a terminal name string
- */
-
-static struct iterm_name_combo {
-	int type;
-	char *name;
-} iterm_names[] = {
-	{ 0x0300, "Output" },
-	{ 0x0301, "Speaker" },
-	{ 0x0302, "Headphone" },
-	{ 0x0303, "HMD Audio" },
-	{ 0x0304, "Desktop Speaker" },
-	{ 0x0305, "Room Speaker" },
-	{ 0x0306, "Com Speaker" },
-	{ 0x0307, "LFE" },
-	{ 0x0600, "External In" },
-	{ 0x0601, "Analog In" },
-	{ 0x0602, "Digital In" },
-	{ 0x0603, "Line" },
-	{ 0x0604, "Legacy In" },
-	{ 0x0605, "IEC958 In" },
-	{ 0x0606, "1394 DA Stream" },
-	{ 0x0607, "1394 DV Stream" },
-	{ 0x0700, "Embedded" },
-	{ 0x0701, "Noise Source" },
-	{ 0x0702, "Equalization Noise" },
-	{ 0x0703, "CD" },
-	{ 0x0704, "DAT" },
-	{ 0x0705, "DCC" },
-	{ 0x0706, "MiniDisk" },
-	{ 0x0707, "Analog Tape" },
-	{ 0x0708, "Phonograph" },
-	{ 0x0709, "VCR Audio" },
-	{ 0x070a, "Video Disk Audio" },
-	{ 0x070b, "DVD Audio" },
-	{ 0x070c, "TV Tuner Audio" },
-	{ 0x070d, "Satellite Rec Audio" },
-	{ 0x070e, "Cable Tuner Audio" },
-	{ 0x070f, "DSS Audio" },
-	{ 0x0710, "Radio Receiver" },
-	{ 0x0711, "Radio Transmitter" },
-	{ 0x0712, "Multi-Track Recorder" },
-	{ 0x0713, "Synthesizer" },
-	{ 0 },
-};
-
-static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
-			 unsigned char *name, int maxlen, int term_only)
-{
-	struct iterm_name_combo *names;
-
-	if (iterm->name)
-		return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
-
-	/* virtual type - not a real terminal */
-	if (iterm->type >> 16) {
-		if (term_only)
-			return 0;
-		switch (iterm->type >> 16) {
-		case UAC_SELECTOR_UNIT:
-			strcpy(name, "Selector"); return 8;
-		case UAC_PROCESSING_UNIT_V1:
-			strcpy(name, "Process Unit"); return 12;
-		case UAC_EXTENSION_UNIT_V1:
-			strcpy(name, "Ext Unit"); return 8;
-		case UAC_MIXER_UNIT:
-			strcpy(name, "Mixer"); return 5;
-		default:
-			return sprintf(name, "Unit %d", iterm->id);
-		}
-	}
-
-	switch (iterm->type & 0xff00) {
-	case 0x0100:
-		strcpy(name, "PCM"); return 3;
-	case 0x0200:
-		strcpy(name, "Mic"); return 3;
-	case 0x0400:
-		strcpy(name, "Headset"); return 7;
-	case 0x0500:
-		strcpy(name, "Phone"); return 5;
-	}
-
-	for (names = iterm_names; names->type; names++)
-		if (names->type == iterm->type) {
-			strcpy(name, names->name);
-			return strlen(names->name);
-		}
-	return 0;
-}
-
-
-/*
- * parse the source unit recursively until it reaches to a terminal
- * or a branched unit.
- */
-static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
-{
-	unsigned char *p1;
-
-	memset(term, 0, sizeof(*term));
-	while ((p1 = find_audio_control_unit(state, id)) != NULL) {
-		term->id = id;
-		switch (p1[2]) {
-		case UAC_INPUT_TERMINAL:
-			term->type = combine_word(p1 + 4);
-			term->channels = p1[7];
-			term->chconfig = combine_word(p1 + 8);
-			term->name = p1[11];
-			return 0;
-		case UAC_FEATURE_UNIT:
-			id = p1[4];
-			break; /* continue to parse */
-		case UAC_MIXER_UNIT:
-			term->type = p1[2] << 16; /* virtual type */
-			term->channels = p1[5 + p1[4]];
-			term->chconfig = combine_word(p1 + 6 + p1[4]);
-			term->name = p1[p1[0] - 1];
-			return 0;
-		case UAC_SELECTOR_UNIT:
-			/* call recursively to retrieve the channel info */
-			if (check_input_term(state, p1[5], term) < 0)
-				return -ENODEV;
-			term->type = p1[2] << 16; /* virtual type */
-			term->id = id;
-			term->name = p1[9 + p1[0] - 1];
-			return 0;
-		case UAC_PROCESSING_UNIT_V1:
-		case UAC_EXTENSION_UNIT_V1:
-			if (p1[6] == 1) {
-				id = p1[7];
-				break; /* continue to parse */
-			}
-			term->type = p1[2] << 16; /* virtual type */
-			term->channels = p1[7 + p1[6]];
-			term->chconfig = combine_word(p1 + 8 + p1[6]);
-			term->name = p1[12 + p1[6] + p1[11 + p1[6]]];
-			return 0;
-		default:
-			return -ENODEV;
-		}
-	}
-	return -ENODEV;
-}
-
-
-/*
- * Feature Unit
- */
-
-/* feature unit control information */
-struct usb_feature_control_info {
-	const char *name;
-	unsigned int type;	/* control type (mute, volume, etc.) */
-};
-
-static struct usb_feature_control_info audio_feature_info[] = {
-	{ "Mute",		USB_MIXER_INV_BOOLEAN },
-	{ "Volume",		USB_MIXER_S16 },
-	{ "Tone Control - Bass",	USB_MIXER_S8 },
-	{ "Tone Control - Mid",		USB_MIXER_S8 },
-	{ "Tone Control - Treble",	USB_MIXER_S8 },
-	{ "Graphic Equalizer",		USB_MIXER_S8 }, /* FIXME: not implemeted yet */
-	{ "Auto Gain Control",	USB_MIXER_BOOLEAN },
-	{ "Delay Control",	USB_MIXER_U16 },
-	{ "Bass Boost",		USB_MIXER_BOOLEAN },
-	{ "Loudness",		USB_MIXER_BOOLEAN },
-};
-
-
-/* private_free callback */
-static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
-{
-	kfree(kctl->private_data);
-	kctl->private_data = NULL;
-}
-
-
-/*
- * interface to ALSA control for feature/mixer units
- */
-
-/*
- * retrieve the minimum and maximum values for the specified control
- */
-static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
-{
-	/* for failsafe */
-	cval->min = default_min;
-	cval->max = cval->min + 1;
-	cval->res = 1;
-	cval->dBmin = cval->dBmax = 0;
-
-	if (cval->val_type == USB_MIXER_BOOLEAN ||
-	    cval->val_type == USB_MIXER_INV_BOOLEAN) {
-		cval->initialized = 1;
-	} else {
-		int minchn = 0;
-		if (cval->cmask) {
-			int i;
-			for (i = 0; i < MAX_CHANNELS; i++)
-				if (cval->cmask & (1 << i)) {
-					minchn = i + 1;
-					break;
-				}
-		}
-		if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
-		    get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
-			snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
-				   cval->id, cval->mixer->ctrlif, cval->control, cval->id);
-			return -EINVAL;
-		}
-		if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
-			cval->res = 1;
-		} else {
-			int last_valid_res = cval->res;
-
-			while (cval->res > 1) {
-				if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
-								(cval->control << 8) | minchn, cval->res / 2) < 0)
-					break;
-				cval->res /= 2;
-			}
-			if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
-				cval->res = last_valid_res;
-		}
-		if (cval->res == 0)
-			cval->res = 1;
-
-		/* Additional checks for the proper resolution
-		 *
-		 * Some devices report smaller resolutions than actually
-		 * reacting.  They don't return errors but simply clip
-		 * to the lower aligned value.
-		 */
-		if (cval->min + cval->res < cval->max) {
-			int last_valid_res = cval->res;
-			int saved, test, check;
-			get_cur_mix_raw(cval, minchn, &saved);
-			for (;;) {
-				test = saved;
-				if (test < cval->max)
-					test += cval->res;
-				else
-					test -= cval->res;
-				if (test < cval->min || test > cval->max ||
-				    set_cur_mix_value(cval, minchn, 0, test) ||
-				    get_cur_mix_raw(cval, minchn, &check)) {
-					cval->res = last_valid_res;
-					break;
-				}
-				if (test == check)
-					break;
-				cval->res *= 2;
-			}
-			set_cur_mix_value(cval, minchn, 0, saved);
-		}
-
-		cval->initialized = 1;
-	}
-
-	/* USB descriptions contain the dB scale in 1/256 dB unit
-	 * while ALSA TLV contains in 1/100 dB unit
-	 */
-	cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
-	cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
-	if (cval->dBmin > cval->dBmax) {
-		/* something is wrong; assume it's either from/to 0dB */
-		if (cval->dBmin < 0)
-			cval->dBmax = 0;
-		else if (cval->dBmin > 0)
-			cval->dBmin = 0;
-		if (cval->dBmin > cval->dBmax) {
-			/* totally crap, return an error */
-			return -EINVAL;
-		}
-	}
-
-	return 0;
-}
-
-
-/* get a feature/mixer unit info */
-static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-
-	if (cval->val_type == USB_MIXER_BOOLEAN ||
-	    cval->val_type == USB_MIXER_INV_BOOLEAN)
-		uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
-	else
-		uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
-	uinfo->count = cval->channels;
-	if (cval->val_type == USB_MIXER_BOOLEAN ||
-	    cval->val_type == USB_MIXER_INV_BOOLEAN) {
-		uinfo->value.integer.min = 0;
-		uinfo->value.integer.max = 1;
-	} else {
-		if (! cval->initialized)
-			get_min_max(cval,  0);
-		uinfo->value.integer.min = 0;
-		uinfo->value.integer.max =
-			(cval->max - cval->min + cval->res - 1) / cval->res;
-	}
-	return 0;
-}
-
-/* get the current value from feature/mixer unit */
-static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	int c, cnt, val, err;
-
-	ucontrol->value.integer.value[0] = cval->min;
-	if (cval->cmask) {
-		cnt = 0;
-		for (c = 0; c < MAX_CHANNELS; c++) {
-			if (!(cval->cmask & (1 << c)))
-				continue;
-			err = get_cur_mix_value(cval, c + 1, cnt, &val);
-			if (err < 0)
-				return cval->mixer->ignore_ctl_error ? 0 : err;
-			val = get_relative_value(cval, val);
-			ucontrol->value.integer.value[cnt] = val;
-			cnt++;
-		}
-		return 0;
-	} else {
-		/* master channel */
-		err = get_cur_mix_value(cval, 0, 0, &val);
-		if (err < 0)
-			return cval->mixer->ignore_ctl_error ? 0 : err;
-		val = get_relative_value(cval, val);
-		ucontrol->value.integer.value[0] = val;
-	}
-	return 0;
-}
-
-/* put the current value to feature/mixer unit */
-static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	int c, cnt, val, oval, err;
-	int changed = 0;
-
-	if (cval->cmask) {
-		cnt = 0;
-		for (c = 0; c < MAX_CHANNELS; c++) {
-			if (!(cval->cmask & (1 << c)))
-				continue;
-			err = get_cur_mix_value(cval, c + 1, cnt, &oval);
-			if (err < 0)
-				return cval->mixer->ignore_ctl_error ? 0 : err;
-			val = ucontrol->value.integer.value[cnt];
-			val = get_abs_value(cval, val);
-			if (oval != val) {
-				set_cur_mix_value(cval, c + 1, cnt, val);
-				changed = 1;
-			}
-			cnt++;
-		}
-	} else {
-		/* master channel */
-		err = get_cur_mix_value(cval, 0, 0, &oval);
-		if (err < 0)
-			return cval->mixer->ignore_ctl_error ? 0 : err;
-		val = ucontrol->value.integer.value[0];
-		val = get_abs_value(cval, val);
-		if (val != oval) {
-			set_cur_mix_value(cval, 0, 0, val);
-			changed = 1;
-		}
-	}
-	return changed;
-}
-
-static struct snd_kcontrol_new usb_feature_unit_ctl = {
-	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "", /* will be filled later manually */
-	.info = mixer_ctl_feature_info,
-	.get = mixer_ctl_feature_get,
-	.put = mixer_ctl_feature_put,
-};
-
-
-/*
- * build a feature control
- */
-
-static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
-{
-	return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
-}
-
-static void build_feature_ctl(struct mixer_build *state, unsigned char *desc,
-			      unsigned int ctl_mask, int control,
-			      struct usb_audio_term *iterm, int unitid)
-{
-	unsigned int len = 0;
-	int mapped_name = 0;
-	int nameid = desc[desc[0] - 1];
-	struct snd_kcontrol *kctl;
-	struct usb_mixer_elem_info *cval;
-	const struct usbmix_name_map *map;
-
-	control++; /* change from zero-based to 1-based value */
-
-	if (control == UAC_GRAPHIC_EQUALIZER_CONTROL) {
-		/* FIXME: not supported yet */
-		return;
-	}
-
-	map = find_map(state, unitid, control);
-	if (check_ignored_ctl(map))
-		return;
-
-	cval = kzalloc(sizeof(*cval), GFP_KERNEL);
-	if (! cval) {
-		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-		return;
-	}
-	cval->mixer = state->mixer;
-	cval->id = unitid;
-	cval->control = control;
-	cval->cmask = ctl_mask;
-	cval->val_type = audio_feature_info[control-1].type;
-	if (ctl_mask == 0)
-		cval->channels = 1;	/* master channel */
-	else {
-		int i, c = 0;
-		for (i = 0; i < 16; i++)
-			if (ctl_mask & (1 << i))
-				c++;
-		cval->channels = c;
-	}
-
-	/* get min/max values */
-	get_min_max(cval, 0);
-
-	kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
-	if (! kctl) {
-		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-		kfree(cval);
-		return;
-	}
-	kctl->private_free = usb_mixer_elem_free;
-
-	len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
-	mapped_name = len != 0;
-	if (! len && nameid)
-		len = snd_usb_copy_string_desc(state, nameid,
-				kctl->id.name, sizeof(kctl->id.name));
-
-	switch (control) {
-	case UAC_MUTE_CONTROL:
-	case UAC_VOLUME_CONTROL:
-		/* determine the control name.  the rule is:
-		 * - if a name id is given in descriptor, use it.
-		 * - if the connected input can be determined, then use the name
-		 *   of terminal type.
-		 * - if the connected output can be determined, use it.
-		 * - otherwise, anonymous name.
-		 */
-		if (! len) {
-			len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
-			if (! len)
-				len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
-			if (! len)
-				len = snprintf(kctl->id.name, sizeof(kctl->id.name),
-					       "Feature %d", unitid);
-		}
-		/* determine the stream direction:
-		 * if the connected output is USB stream, then it's likely a
-		 * capture stream.  otherwise it should be playback (hopefully :)
-		 */
-		if (! mapped_name && ! (state->oterm.type >> 16)) {
-			if ((state->oterm.type & 0xff00) == 0x0100) {
-				len = append_ctl_name(kctl, " Capture");
-			} else {
-				len = append_ctl_name(kctl, " Playback");
-			}
-		}
-		append_ctl_name(kctl, control == UAC_MUTE_CONTROL ?
-				" Switch" : " Volume");
-		if (control == UAC_VOLUME_CONTROL) {
-			kctl->tlv.c = mixer_vol_tlv;
-			kctl->vd[0].access |= 
-				SNDRV_CTL_ELEM_ACCESS_TLV_READ |
-				SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
-			check_mapped_dB(map, cval);
-		}
-		break;
-
-	default:
-		if (! len)
-			strlcpy(kctl->id.name, audio_feature_info[control-1].name,
-				sizeof(kctl->id.name));
-		break;
-	}
-
-	/* volume control quirks */
-	switch (state->chip->usb_id) {
-	case USB_ID(0x0471, 0x0101):
-	case USB_ID(0x0471, 0x0104):
-	case USB_ID(0x0471, 0x0105):
-	case USB_ID(0x0672, 0x1041):
-	/* quirk for UDA1321/N101.
-	 * note that detection between firmware 2.1.1.7 (N101)
-	 * and later 2.1.1.21 is not very clear from datasheets.
-	 * I hope that the min value is -15360 for newer firmware --jk
-	 */
-		if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
-		    cval->min == -15616) {
-			snd_printk(KERN_INFO
-				 "set volume quirk for UDA1321/N101 chip\n");
-			cval->max = -256;
-		}
-		break;
-
-	case USB_ID(0x046d, 0x09a4):
-		if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
-			snd_printk(KERN_INFO
-				"set volume quirk for QuickCam E3500\n");
-			cval->min = 6080;
-			cval->max = 8768;
-			cval->res = 192;
-		}
-		break;
-
-	}
-
-	snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
-		    cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
-	add_control_to_empty(state, kctl);
-}
-
-
-
-/*
- * parse a feature unit
- *
- * most of controlls are defined here.
- */
-static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
-{
-	int channels, i, j;
-	struct usb_audio_term iterm;
-	unsigned int master_bits, first_ch_bits;
-	int err, csize;
-	struct uac_feature_unit_descriptor *ftr = _ftr;
-
-	if (ftr->bLength < 7 || ! (csize = ftr->bControlSize) || ftr->bLength < 7 + csize) {
-		snd_printk(KERN_ERR "usbaudio: unit %u: invalid UAC_FEATURE_UNIT descriptor\n", unitid);
-		return -EINVAL;
-	}
-
-	/* parse the source unit */
-	if ((err = parse_audio_unit(state, ftr->bSourceID)) < 0)
-		return err;
-
-	/* determine the input source type and name */
-	if (check_input_term(state, ftr->bSourceID, &iterm) < 0)
-		return -EINVAL;
-
-	channels = (ftr->bLength - 7) / csize - 1;
-
-	master_bits = snd_usb_combine_bytes(ftr->controls, csize);
-	/* master configuration quirks */
-	switch (state->chip->usb_id) {
-	case USB_ID(0x08bb, 0x2702):
-		snd_printk(KERN_INFO
-			   "usbmixer: master volume quirk for PCM2702 chip\n");
-		/* disable non-functional volume control */
-		master_bits &= ~UAC_FU_VOLUME;
-		break;
-	}
-	if (channels > 0)
-		first_ch_bits = snd_usb_combine_bytes(ftr->controls + csize, csize);
-	else
-		first_ch_bits = 0;
-	/* check all control types */
-	for (i = 0; i < 10; i++) {
-		unsigned int ch_bits = 0;
-		for (j = 0; j < channels; j++) {
-			unsigned int mask = snd_usb_combine_bytes(ftr->controls + csize * (j+1), csize);
-			if (mask & (1 << i))
-				ch_bits |= (1 << j);
-		}
-		if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
-			build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid);
-		if (master_bits & (1 << i))
-			build_feature_ctl(state, _ftr, 0, i, &iterm, unitid);
-	}
-
-	return 0;
-}
-
-
-/*
- * Mixer Unit
- */
-
-/*
- * build a mixer unit control
- *
- * the callbacks are identical with feature unit.
- * input channel number (zero based) is given in control field instead.
- */
-
-static void build_mixer_unit_ctl(struct mixer_build *state, unsigned char *desc,
-				 int in_pin, int in_ch, int unitid,
-				 struct usb_audio_term *iterm)
-{
-	struct usb_mixer_elem_info *cval;
-	unsigned int input_pins = desc[4];
-	unsigned int num_outs = desc[5 + input_pins];
-	unsigned int i, len;
-	struct snd_kcontrol *kctl;
-	const struct usbmix_name_map *map;
-
-	map = find_map(state, unitid, 0);
-	if (check_ignored_ctl(map))
-		return;
-
-	cval = kzalloc(sizeof(*cval), GFP_KERNEL);
-	if (! cval)
-		return;
-
-	cval->mixer = state->mixer;
-	cval->id = unitid;
-	cval->control = in_ch + 1; /* based on 1 */
-	cval->val_type = USB_MIXER_S16;
-	for (i = 0; i < num_outs; i++) {
-		if (check_matrix_bitmap(desc + 9 + input_pins, in_ch, i, num_outs)) {
-			cval->cmask |= (1 << i);
-			cval->channels++;
-		}
-	}
-
-	/* get min/max values */
-	get_min_max(cval, 0);
-
-	kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
-	if (! kctl) {
-		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-		kfree(cval);
-		return;
-	}
-	kctl->private_free = usb_mixer_elem_free;
-
-	len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
-	if (! len)
-		len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
-	if (! len)
-		len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
-	append_ctl_name(kctl, " Volume");
-
-	snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
-		    cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
-	add_control_to_empty(state, kctl);
-}
-
-
-/*
- * parse a mixer unit
- */
-static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, unsigned char *desc)
-{
-	struct usb_audio_term iterm;
-	int input_pins, num_ins, num_outs;
-	int pin, ich, err;
-
-	if (desc[0] < 11 || ! (input_pins = desc[4]) || ! (num_outs = desc[5 + input_pins])) {
-		snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
-		return -EINVAL;
-	}
-	/* no bmControls field (e.g. Maya44) -> ignore */
-	if (desc[0] <= 10 + input_pins) {
-		snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
-		return 0;
-	}
-
-	num_ins = 0;
-	ich = 0;
-	for (pin = 0; pin < input_pins; pin++) {
-		err = parse_audio_unit(state, desc[5 + pin]);
-		if (err < 0)
-			return err;
-		err = check_input_term(state, desc[5 + pin], &iterm);
-		if (err < 0)
-			return err;
-		num_ins += iterm.channels;
-		for (; ich < num_ins; ++ich) {
-			int och, ich_has_controls = 0;
-
-			for (och = 0; och < num_outs; ++och) {
-				if (check_matrix_bitmap(desc + 9 + input_pins,
-							ich, och, num_outs)) {
-					ich_has_controls = 1;
-					break;
-				}
-			}
-			if (ich_has_controls)
-				build_mixer_unit_ctl(state, desc, pin, ich,
-						     unitid, &iterm);
-		}
-	}
-	return 0;
-}
-
-
-/*
- * Processing Unit / Extension Unit
- */
-
-/* get callback for processing/extension unit */
-static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	int err, val;
-
-	err = get_cur_ctl_value(cval, cval->control << 8, &val);
-	if (err < 0 && cval->mixer->ignore_ctl_error) {
-		ucontrol->value.integer.value[0] = cval->min;
-		return 0;
-	}
-	if (err < 0)
-		return err;
-	val = get_relative_value(cval, val);
-	ucontrol->value.integer.value[0] = val;
-	return 0;
-}
-
-/* put callback for processing/extension unit */
-static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	int val, oval, err;
-
-	err = get_cur_ctl_value(cval, cval->control << 8, &oval);
-	if (err < 0) {
-		if (cval->mixer->ignore_ctl_error)
-			return 0;
-		return err;
-	}
-	val = ucontrol->value.integer.value[0];
-	val = get_abs_value(cval, val);
-	if (val != oval) {
-		set_cur_ctl_value(cval, cval->control << 8, val);
-		return 1;
-	}
-	return 0;
-}
-
-/* alsa control interface for processing/extension unit */
-static struct snd_kcontrol_new mixer_procunit_ctl = {
-	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "", /* will be filled later */
-	.info = mixer_ctl_feature_info,
-	.get = mixer_ctl_procunit_get,
-	.put = mixer_ctl_procunit_put,
-};
-
-
-/*
- * predefined data for processing units
- */
-struct procunit_value_info {
-	int control;
-	char *suffix;
-	int val_type;
-	int min_value;
-};
-
-struct procunit_info {
-	int type;
-	char *name;
-	struct procunit_value_info *values;
-};
-
-static struct procunit_value_info updown_proc_info[] = {
-	{ USB_PROC_UPDOWN_SWITCH, "Switch", USB_MIXER_BOOLEAN },
-	{ USB_PROC_UPDOWN_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
-	{ 0 }
-};
-static struct procunit_value_info prologic_proc_info[] = {
-	{ USB_PROC_PROLOGIC_SWITCH, "Switch", USB_MIXER_BOOLEAN },
-	{ USB_PROC_PROLOGIC_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
-	{ 0 }
-};
-static struct procunit_value_info threed_enh_proc_info[] = {
-	{ USB_PROC_3DENH_SWITCH, "Switch", USB_MIXER_BOOLEAN },
-	{ USB_PROC_3DENH_SPACE, "Spaciousness", USB_MIXER_U8 },
-	{ 0 }
-};
-static struct procunit_value_info reverb_proc_info[] = {
-	{ USB_PROC_REVERB_SWITCH, "Switch", USB_MIXER_BOOLEAN },
-	{ USB_PROC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
-	{ USB_PROC_REVERB_TIME, "Time", USB_MIXER_U16 },
-	{ USB_PROC_REVERB_DELAY, "Delay", USB_MIXER_U8 },
-	{ 0 }
-};
-static struct procunit_value_info chorus_proc_info[] = {
-	{ USB_PROC_CHORUS_SWITCH, "Switch", USB_MIXER_BOOLEAN },
-	{ USB_PROC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
-	{ USB_PROC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
-	{ USB_PROC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
-	{ 0 }
-};
-static struct procunit_value_info dcr_proc_info[] = {
-	{ USB_PROC_DCR_SWITCH, "Switch", USB_MIXER_BOOLEAN },
-	{ USB_PROC_DCR_RATIO, "Ratio", USB_MIXER_U16 },
-	{ USB_PROC_DCR_MAX_AMP, "Max Amp", USB_MIXER_S16 },
-	{ USB_PROC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
-	{ USB_PROC_DCR_ATTACK, "Attack Time", USB_MIXER_U16 },
-	{ USB_PROC_DCR_RELEASE, "Release Time", USB_MIXER_U16 },
-	{ 0 }
-};
-
-static struct procunit_info procunits[] = {
-	{ USB_PROC_UPDOWN, "Up Down", updown_proc_info },
-	{ USB_PROC_PROLOGIC, "Dolby Prologic", prologic_proc_info },
-	{ USB_PROC_3DENH, "3D Stereo Extender", threed_enh_proc_info },
-	{ USB_PROC_REVERB, "Reverb", reverb_proc_info },
-	{ USB_PROC_CHORUS, "Chorus", chorus_proc_info },
-	{ USB_PROC_DCR, "DCR", dcr_proc_info },
-	{ 0 },
-};
-/*
- * predefined data for extension units
- */
-static struct procunit_value_info clock_rate_xu_info[] = {
-       { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
-       { 0 }
-};
-static struct procunit_value_info clock_source_xu_info[] = {
-	{ USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
-	{ 0 }
-};
-static struct procunit_value_info spdif_format_xu_info[] = {
-	{ USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
-	{ 0 }
-};
-static struct procunit_value_info soft_limit_xu_info[] = {
-	{ USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
-	{ 0 }
-};
-static struct procunit_info extunits[] = {
-	{ USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
-	{ USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
-	{ USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
-	{ USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
-	{ 0 }
-};
-/*
- * build a processing/extension unit
- */
-static int build_audio_procunit(struct mixer_build *state, int unitid, unsigned char *dsc, struct procunit_info *list, char *name)
-{
-	int num_ins = dsc[6];
-	struct usb_mixer_elem_info *cval;
-	struct snd_kcontrol *kctl;
-	int i, err, nameid, type, len;
-	struct procunit_info *info;
-	struct procunit_value_info *valinfo;
-	const struct usbmix_name_map *map;
-	static struct procunit_value_info default_value_info[] = {
-		{ 0x01, "Switch", USB_MIXER_BOOLEAN },
-		{ 0 }
-	};
-	static struct procunit_info default_info = {
-		0, NULL, default_value_info
-	};
-
-	if (dsc[0] < 13 || dsc[0] < 13 + num_ins || dsc[0] < num_ins + dsc[11 + num_ins]) {
-		snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
-		return -EINVAL;
-	}
-
-	for (i = 0; i < num_ins; i++) {
-		if ((err = parse_audio_unit(state, dsc[7 + i])) < 0)
-			return err;
-	}
-
-	type = combine_word(&dsc[4]);
-	for (info = list; info && info->type; info++)
-		if (info->type == type)
-			break;
-	if (! info || ! info->type)
-		info = &default_info;
-
-	for (valinfo = info->values; valinfo->control; valinfo++) {
-		/* FIXME: bitmap might be longer than 8bit */
-		if (! (dsc[12 + num_ins] & (1 << (valinfo->control - 1))))
-			continue;
-		map = find_map(state, unitid, valinfo->control);
-		if (check_ignored_ctl(map))
-			continue;
-		cval = kzalloc(sizeof(*cval), GFP_KERNEL);
-		if (! cval) {
-			snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-			return -ENOMEM;
-		}
-		cval->mixer = state->mixer;
-		cval->id = unitid;
-		cval->control = valinfo->control;
-		cval->val_type = valinfo->val_type;
-		cval->channels = 1;
-
-		/* get min/max values */
-		if (type == USB_PROC_UPDOWN && cval->control == USB_PROC_UPDOWN_MODE_SEL) {
-			/* FIXME: hard-coded */
-			cval->min = 1;
-			cval->max = dsc[15];
-			cval->res = 1;
-			cval->initialized = 1;
-		} else {
-			if (type == USB_XU_CLOCK_RATE) {
-				/* E-Mu USB 0404/0202/TrackerPre
-				 * samplerate control quirk
-				 */
-				cval->min = 0;
-				cval->max = 5;
-				cval->res = 1;
-				cval->initialized = 1;
-			} else
-				get_min_max(cval, valinfo->min_value);
-		}
-
-		kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
-		if (! kctl) {
-			snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-			kfree(cval);
-			return -ENOMEM;
-		}
-		kctl->private_free = usb_mixer_elem_free;
-
-		if (check_mapped_name(map, kctl->id.name,
-						sizeof(kctl->id.name)))
-			/* nothing */ ;
-		else if (info->name)
-			strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
-		else {
-			nameid = dsc[12 + num_ins + dsc[11 + num_ins]];
-			len = 0;
-			if (nameid)
-				len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
-			if (! len)
-				strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
-		}
-		append_ctl_name(kctl, " ");
-		append_ctl_name(kctl, valinfo->suffix);
-
-		snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
-			    cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
-		if ((err = add_control_to_empty(state, kctl)) < 0)
-			return err;
-	}
-	return 0;
-}
-
-
-static int parse_audio_processing_unit(struct mixer_build *state, int unitid, unsigned char *desc)
-{
-	return build_audio_procunit(state, unitid, desc, procunits, "Processing Unit");
-}
-
-static int parse_audio_extension_unit(struct mixer_build *state, int unitid, unsigned char *desc)
-{
-	return build_audio_procunit(state, unitid, desc, extunits, "Extension Unit");
-}
-
-
-/*
- * Selector Unit
- */
-
-/* info callback for selector unit
- * use an enumerator type for routing
- */
-static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	char **itemlist = (char **)kcontrol->private_value;
-
-	if (snd_BUG_ON(!itemlist))
-		return -EINVAL;
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	uinfo->count = 1;
-	uinfo->value.enumerated.items = cval->max;
-	if ((int)uinfo->value.enumerated.item >= cval->max)
-		uinfo->value.enumerated.item = cval->max - 1;
-	strcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item]);
-	return 0;
-}
-
-/* get callback for selector unit */
-static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	int val, err;
-
-	err = get_cur_ctl_value(cval, 0, &val);
-	if (err < 0) {
-		if (cval->mixer->ignore_ctl_error) {
-			ucontrol->value.enumerated.item[0] = 0;
-			return 0;
-		}
-		return err;
-	}
-	val = get_relative_value(cval, val);
-	ucontrol->value.enumerated.item[0] = val;
-	return 0;
-}
-
-/* put callback for selector unit */
-static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_elem_info *cval = kcontrol->private_data;
-	int val, oval, err;
-
-	err = get_cur_ctl_value(cval, 0, &oval);
-	if (err < 0) {
-		if (cval->mixer->ignore_ctl_error)
-			return 0;
-		return err;
-	}
-	val = ucontrol->value.enumerated.item[0];
-	val = get_abs_value(cval, val);
-	if (val != oval) {
-		set_cur_ctl_value(cval, 0, val);
-		return 1;
-	}
-	return 0;
-}
-
-/* alsa control interface for selector unit */
-static struct snd_kcontrol_new mixer_selectunit_ctl = {
-	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "", /* will be filled later */
-	.info = mixer_ctl_selector_info,
-	.get = mixer_ctl_selector_get,
-	.put = mixer_ctl_selector_put,
-};
-
-
-/* private free callback.
- * free both private_data and private_value
- */
-static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
-{
-	int i, num_ins = 0;
-
-	if (kctl->private_data) {
-		struct usb_mixer_elem_info *cval = kctl->private_data;
-		num_ins = cval->max;
-		kfree(cval);
-		kctl->private_data = NULL;
-	}
-	if (kctl->private_value) {
-		char **itemlist = (char **)kctl->private_value;
-		for (i = 0; i < num_ins; i++)
-			kfree(itemlist[i]);
-		kfree(itemlist);
-		kctl->private_value = 0;
-	}
-}
-
-/*
- * parse a selector unit
- */
-static int parse_audio_selector_unit(struct mixer_build *state, int unitid, unsigned char *desc)
-{
-	unsigned int num_ins = desc[4];
-	unsigned int i, nameid, len;
-	int err;
-	struct usb_mixer_elem_info *cval;
-	struct snd_kcontrol *kctl;
-	const struct usbmix_name_map *map;
-	char **namelist;
-
-	if (! num_ins || desc[0] < 5 + num_ins) {
-		snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
-		return -EINVAL;
-	}
-
-	for (i = 0; i < num_ins; i++) {
-		if ((err = parse_audio_unit(state, desc[5 + i])) < 0)
-			return err;
-	}
-
-	if (num_ins == 1) /* only one ? nonsense! */
-		return 0;
-
-	map = find_map(state, unitid, 0);
-	if (check_ignored_ctl(map))
-		return 0;
-
-	cval = kzalloc(sizeof(*cval), GFP_KERNEL);
-	if (! cval) {
-		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-		return -ENOMEM;
-	}
-	cval->mixer = state->mixer;
-	cval->id = unitid;
-	cval->val_type = USB_MIXER_U8;
-	cval->channels = 1;
-	cval->min = 1;
-	cval->max = num_ins;
-	cval->res = 1;
-	cval->initialized = 1;
-
-	namelist = kmalloc(sizeof(char *) * num_ins, GFP_KERNEL);
-	if (! namelist) {
-		snd_printk(KERN_ERR "cannot malloc\n");
-		kfree(cval);
-		return -ENOMEM;
-	}
-#define MAX_ITEM_NAME_LEN	64
-	for (i = 0; i < num_ins; i++) {
-		struct usb_audio_term iterm;
-		len = 0;
-		namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
-		if (! namelist[i]) {
-			snd_printk(KERN_ERR "cannot malloc\n");
-			while (i--)
-				kfree(namelist[i]);
-			kfree(namelist);
-			kfree(cval);
-			return -ENOMEM;
-		}
-		len = check_mapped_selector_name(state, unitid, i, namelist[i],
-						 MAX_ITEM_NAME_LEN);
-		if (! len && check_input_term(state, desc[5 + i], &iterm) >= 0)
-			len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
-		if (! len)
-			sprintf(namelist[i], "Input %d", i);
-	}
-
-	kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
-	if (! kctl) {
-		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
-		kfree(namelist);
-		kfree(cval);
-		return -ENOMEM;
-	}
-	kctl->private_value = (unsigned long)namelist;
-	kctl->private_free = usb_mixer_selector_elem_free;
-
-	nameid = desc[desc[0] - 1];
-	len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
-	if (len)
-		;
-	else if (nameid)
-		snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
-	else {
-		len = get_term_name(state, &state->oterm,
-				    kctl->id.name, sizeof(kctl->id.name), 0);
-		if (! len)
-			strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
-
-		if ((state->oterm.type & 0xff00) == 0x0100)
-			append_ctl_name(kctl, " Capture Source");
-		else
-			append_ctl_name(kctl, " Playback Source");
-	}
-
-	snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
-		    cval->id, kctl->id.name, num_ins);
-	if ((err = add_control_to_empty(state, kctl)) < 0)
-		return err;
-
-	return 0;
-}
-
-
-/*
- * parse an audio unit recursively
- */
-
-static int parse_audio_unit(struct mixer_build *state, int unitid)
-{
-	unsigned char *p1;
-
-	if (test_and_set_bit(unitid, state->unitbitmap))
-		return 0; /* the unit already visited */
-
-	p1 = find_audio_control_unit(state, unitid);
-	if (!p1) {
-		snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
-		return -EINVAL;
-	}
-
-	switch (p1[2]) {
-	case UAC_INPUT_TERMINAL:
-		return 0; /* NOP */
-	case UAC_MIXER_UNIT:
-		return parse_audio_mixer_unit(state, unitid, p1);
-	case UAC_SELECTOR_UNIT:
-		return parse_audio_selector_unit(state, unitid, p1);
-	case UAC_FEATURE_UNIT:
-		return parse_audio_feature_unit(state, unitid, p1);
-	case UAC_PROCESSING_UNIT_V1:
-		return parse_audio_processing_unit(state, unitid, p1);
-	case UAC_EXTENSION_UNIT_V1:
-		return parse_audio_extension_unit(state, unitid, p1);
-	default:
-		snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
-		return -EINVAL;
-	}
-}
-
-static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
-{
-	kfree(mixer->id_elems);
-	if (mixer->urb) {
-		kfree(mixer->urb->transfer_buffer);
-		usb_free_urb(mixer->urb);
-	}
-	usb_free_urb(mixer->rc_urb);
-	kfree(mixer->rc_setup_packet);
-	kfree(mixer);
-}
-
-static int snd_usb_mixer_dev_free(struct snd_device *device)
-{
-	struct usb_mixer_interface *mixer = device->device_data;
-	snd_usb_mixer_free(mixer);
-	return 0;
-}
-
-/*
- * create mixer controls
- *
- * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
- */
-static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
-{
-	struct uac_output_terminal_descriptor_v1 *desc;
-	struct mixer_build state;
-	int err;
-	const struct usbmix_ctl_map *map;
-	struct usb_host_interface *hostif;
-
-	hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
-	memset(&state, 0, sizeof(state));
-	state.chip = mixer->chip;
-	state.mixer = mixer;
-	state.buffer = hostif->extra;
-	state.buflen = hostif->extralen;
-
-	/* check the mapping table */
-	for (map = usbmix_ctl_maps; map->id; map++) {
-		if (map->id == state.chip->usb_id) {
-			state.map = map->map;
-			state.selector_map = map->selector_map;
-			mixer->ignore_ctl_error = map->ignore_ctl_error;
-			break;
-		}
-	}
-
-	desc = NULL;
-	while ((desc = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, desc, UAC_OUTPUT_TERMINAL)) != NULL) {
-		if (desc->bLength < 9)
-			continue; /* invalid descriptor? */
-		set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
-		state.oterm.id = desc->bTerminalID;
-		state.oterm.type = le16_to_cpu(desc->wTerminalType);
-		state.oterm.name = desc->iTerminal;
-		err = parse_audio_unit(&state, desc->bSourceID);
-		if (err < 0)
-			return err;
-	}
-	return 0;
-}
-
-void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
-{
-	struct usb_mixer_elem_info *info;
-
-	for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
-		snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-			       info->elem_id);
-}
-
-static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
-				    int unitid,
-				    struct usb_mixer_elem_info *cval)
-{
-	static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
-				    "S8", "U8", "S16", "U16"};
-	snd_iprintf(buffer, "  Unit: %i\n", unitid);
-	if (cval->elem_id)
-		snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
-				cval->elem_id->name, cval->elem_id->index);
-	snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
-			    "channels=%i, type=\"%s\"\n", cval->id,
-			    cval->control, cval->cmask, cval->channels,
-			    val_types[cval->val_type]);
-	snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
-			    cval->min, cval->max, cval->dBmin, cval->dBmax);
-}
-
-static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
-				    struct snd_info_buffer *buffer)
-{
-	struct snd_usb_audio *chip = entry->private_data;
-	struct usb_mixer_interface *mixer;
-	struct usb_mixer_elem_info *cval;
-	int unitid;
-
-	list_for_each_entry(mixer, &chip->mixer_list, list) {
-		snd_iprintf(buffer,
-			"USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
-				chip->usb_id, mixer->ctrlif,
-				mixer->ignore_ctl_error);
-		snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
-		for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
-			for (cval = mixer->id_elems[unitid]; cval;
-						cval = cval->next_id_elem)
-				snd_usb_mixer_dump_cval(buffer, unitid, cval);
-		}
-	}
-}
-
-static void snd_usb_mixer_status_complete(struct urb *urb)
-{
-	struct usb_mixer_interface *mixer = urb->context;
-
-	if (urb->status == 0) {
-		u8 *buf = urb->transfer_buffer;
-		int i;
-
-		for (i = urb->actual_length; i >= 2; buf += 2, i -= 2) {
-			snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
-				   buf[0], buf[1]);
-			/* ignore any notifications not from the control interface */
-			if ((buf[0] & 0x0f) != 0)
-				continue;
-			if (!(buf[0] & 0x40))
-				snd_usb_mixer_notify_id(mixer, buf[1]);
-			else
-				snd_usb_mixer_rc_memory_change(mixer, buf[1]);
-		}
-	}
-	if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
-		urb->dev = mixer->chip->dev;
-		usb_submit_urb(urb, GFP_ATOMIC);
-	}
-}
-
-/* create the handler for the optional status interrupt endpoint */
-static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
-{
-	struct usb_host_interface *hostif;
-	struct usb_endpoint_descriptor *ep;
-	void *transfer_buffer;
-	int buffer_length;
-	unsigned int epnum;
-
-	hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
-	/* we need one interrupt input endpoint */
-	if (get_iface_desc(hostif)->bNumEndpoints < 1)
-		return 0;
-	ep = get_endpoint(hostif, 0);
-	if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
-		return 0;
-
-	epnum = usb_endpoint_num(ep);
-	buffer_length = le16_to_cpu(ep->wMaxPacketSize);
-	transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
-	if (!transfer_buffer)
-		return -ENOMEM;
-	mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
-	if (!mixer->urb) {
-		kfree(transfer_buffer);
-		return -ENOMEM;
-	}
-	usb_fill_int_urb(mixer->urb, mixer->chip->dev,
-			 usb_rcvintpipe(mixer->chip->dev, epnum),
-			 transfer_buffer, buffer_length,
-			 snd_usb_mixer_status_complete, mixer, ep->bInterval);
-	usb_submit_urb(mixer->urb, GFP_KERNEL);
-	return 0;
-}
-
-int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
-			 int ignore_error)
-{
-	static struct snd_device_ops dev_ops = {
-		.dev_free = snd_usb_mixer_dev_free
-	};
-	struct usb_mixer_interface *mixer;
-	struct snd_info_entry *entry;
-	struct usb_host_interface *host_iface;
-	int err, protocol;
-
-	strcpy(chip->card->mixername, "USB Mixer");
-
-	mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
-	if (!mixer)
-		return -ENOMEM;
-	mixer->chip = chip;
-	mixer->ctrlif = ctrlif;
-	mixer->ignore_ctl_error = ignore_error;
-	mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
-				  GFP_KERNEL);
-	if (!mixer->id_elems) {
-		kfree(mixer);
-		return -ENOMEM;
-	}
-
-	host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
-	protocol = host_iface->desc.bInterfaceProtocol;
-
-	/* FIXME! */
-	if (protocol != UAC_VERSION_1) {
-		snd_printk(KERN_WARNING "mixer interface protocol 0x%02x not yet supported\n",
-					protocol);
-		return 0;
-	}
-
-	if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
-	    (err = snd_usb_mixer_status_create(mixer)) < 0)
-		goto _error;
-
-	snd_usb_mixer_apply_create_quirk(mixer);
-
-	err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
-	if (err < 0)
-		goto _error;
-
-	if (list_empty(&chip->mixer_list) &&
-	    !snd_card_proc_new(chip->card, "usbmixer", &entry))
-		snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
-
-	list_add(&mixer->list, &chip->mixer_list);
-	return 0;
-
-_error:
-	snd_usb_mixer_free(mixer);
-	return err;
-}
-
-void snd_usb_mixer_disconnect(struct list_head *p)
-{
-	struct usb_mixer_interface *mixer;
-
-	mixer = list_entry(p, struct usb_mixer_interface, list);
-	usb_kill_urb(mixer->urb);
-	usb_kill_urb(mixer->rc_urb);
-}