// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   USB Audio Driver for ALSA
 *
 *   Quirks and vendor-specific extensions for mixer interfaces
 *
 *   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)
 *
 *   Audio Advantage Micro II support added by:
 *          Przemek Rudy (prudy1@o2.pl)
 */

#include <linux/hid.h>
#include <linux/init.h>
#include <linux/math64.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>

#include <sound/asoundef.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 "mixer.h"
#include "mixer_quirks.h"
#include "mixer_scarlett.h"
#include "mixer_scarlett_gen2.h"
#include "mixer_us16x08.h"
#include "mixer_s1810c.h"
#include "helper.h"

struct std_mono_table {
        unsigned int unitid, control, cmask;
        int val_type;
        const char *name;
        snd_kcontrol_tlv_rw_t *tlv_callback;
};

/* This function allows for the creation of standard UAC controls.
 * See the quirks for M-Audio FTUs or Ebox-44.
 * If you don't want to set a TLV callback pass NULL.
 *
 * Since there doesn't seem to be a devices that needs a multichannel
 * version, we keep it mono for simplicity.
 */
static int snd_create_std_mono_ctl_offset(struct usb_mixer_interface *mixer,
                                unsigned int unitid,
                                unsigned int control,
                                unsigned int cmask,
                                int val_type,
                                unsigned int idx_off,
                                const char *name,
                                snd_kcontrol_tlv_rw_t *tlv_callback)
{
        struct usb_mixer_elem_info *cval;
        struct snd_kcontrol *kctl;

        cval = kzalloc(sizeof(*cval), GFP_KERNEL);
        if (!cval)
                return -ENOMEM;

        snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
        cval->val_type = val_type;
        cval->channels = 1;
        cval->control = control;
        cval->cmask = cmask;
        cval->idx_off = idx_off;

        /* get_min_max() is called only for integer volumes later,
         * so provide a short-cut for booleans */
        cval->min = 0;
        cval->max = 1;
        cval->res = 0;
        cval->dBmin = 0;
        cval->dBmax = 0;

        /* Create control */
        kctl = snd_ctl_new1(snd_usb_feature_unit_ctl, cval);
        if (!kctl) {
                kfree(cval);
                return -ENOMEM;
        }

        /* Set name */
        snprintf(kctl->id.name, sizeof(kctl->id.name), name);
        kctl->private_free = snd_usb_mixer_elem_free;

        /* set TLV */
        if (tlv_callback) {
                kctl->tlv.c = tlv_callback;
                kctl->vd[0].access |=
                        SNDRV_CTL_ELEM_ACCESS_TLV_READ |
                        SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
        }
        /* Add control to mixer */
        return snd_usb_mixer_add_control(&cval->head, kctl);
}

static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer,
                                unsigned int unitid,
                                unsigned int control,
                                unsigned int cmask,
                                int val_type,
                                const char *name,
                                snd_kcontrol_tlv_rw_t *tlv_callback)
{
        return snd_create_std_mono_ctl_offset(mixer, unitid, control, cmask,
                val_type, 0 /* Offset */, name, tlv_callback);
}

/*
 * Create a set of standard UAC controls from a table
 */
static int snd_create_std_mono_table(struct usb_mixer_interface *mixer,
                                     const struct std_mono_table *t)
{
        int err;

        while (t->name != NULL) {
                err = snd_create_std_mono_ctl(mixer, t->unitid, t->control,
                                t->cmask, t->val_type, t->name, t->tlv_callback);
                if (err < 0)
                        return err;
                t++;
        }

        return 0;
}

static int add_single_ctl_with_resume(struct usb_mixer_interface *mixer,
                                      int id,
                                      usb_mixer_elem_resume_func_t resume,
                                      const struct snd_kcontrol_new *knew,
                                      struct usb_mixer_elem_list **listp)
{
        struct usb_mixer_elem_list *list;
        struct snd_kcontrol *kctl;

        list = kzalloc(sizeof(*list), GFP_KERNEL);
        if (!list)
                return -ENOMEM;
        if (listp)
                *listp = list;
        list->mixer = mixer;
        list->id = id;
        list->resume = resume;
        kctl = snd_ctl_new1(knew, list);
        if (!kctl) {
                kfree(list);
                return -ENOMEM;
        }
        kctl->private_free = snd_usb_mixer_elem_free;
        /* don't use snd_usb_mixer_add_control() here, this is a special list element */
        return snd_usb_mixer_add_list(list, kctl, false);
}

/*
 * Sound Blaster remote control configuration
 *
 * format of remote control data:
 * Extigy:       xx 00
 * Audigy 2 NX:  06 80 xx 00 00 00
 * Live! 24-bit: 06 80 xx yy 22 83
 */
static const struct rc_config {
        u32 usb_id;
        u8  offset;
        u8  length;
        u8  packet_length;
        u8  min_packet_length; /* minimum accepted length of the URB result */
        u8  mute_mixer_id;
        u32 mute_code;
} rc_configs[] = {
        { USB_ID(0x041e, 0x3000), 0, 1, 2, 1,  18, 0x0013 }, /* Extigy       */
        { USB_ID(0x041e, 0x3020), 2, 1, 6, 6,  18, 0x0013 }, /* Audigy 2 NX  */
        { USB_ID(0x041e, 0x3040), 2, 2, 6, 6,  2,  0x6e91 }, /* Live! 24-bit */
        { USB_ID(0x041e, 0x3042), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 */
        { USB_ID(0x041e, 0x30df), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
        { USB_ID(0x041e, 0x3237), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
        { USB_ID(0x041e, 0x3263), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
        { USB_ID(0x041e, 0x3048), 2, 2, 6, 6,  2,  0x6e91 }, /* Toshiba SB0500 */
};

static void snd_usb_soundblaster_remote_complete(struct urb *urb)
{
        struct usb_mixer_interface *mixer = urb->context;
        const struct rc_config *rc = mixer->rc_cfg;
        u32 code;

        if (urb->status < 0 || urb->actual_length < rc->min_packet_length)
                return;

        code = mixer->rc_buffer[rc->offset];
        if (rc->length == 2)
                code |= mixer->rc_buffer[rc->offset + 1] << 8;

        /* the Mute button actually changes the mixer control */
        if (code == rc->mute_code)
                snd_usb_mixer_notify_id(mixer, rc->mute_mixer_id);
        mixer->rc_code = code;
        wmb();
        wake_up(&mixer->rc_waitq);
}

static long snd_usb_sbrc_hwdep_read(struct snd_hwdep *hw, char __user *buf,
                                     long count, loff_t *offset)
{
        struct usb_mixer_interface *mixer = hw->private_data;
        int err;
        u32 rc_code;

        if (count != 1 && count != 4)
                return -EINVAL;
        err = wait_event_interruptible(mixer->rc_waitq,
                                       (rc_code = xchg(&mixer->rc_code, 0)) != 0);
        if (err == 0) {
                if (count == 1)
                        err = put_user(rc_code, buf);
                else
                        err = put_user(rc_code, (u32 __user *)buf);
        }
        return err < 0 ? err : count;
}

static __poll_t snd_usb_sbrc_hwdep_poll(struct snd_hwdep *hw, struct file *file,
                                            poll_table *wait)
{
        struct usb_mixer_interface *mixer = hw->private_data;

        poll_wait(file, &mixer->rc_waitq, wait);
        return mixer->rc_code ? EPOLLIN | EPOLLRDNORM : 0;
}

static int snd_usb_soundblaster_remote_init(struct usb_mixer_interface *mixer)
{
        struct snd_hwdep *hwdep;
        int err, len, i;

        for (i = 0; i < ARRAY_SIZE(rc_configs); ++i)
                if (rc_configs[i].usb_id == mixer->chip->usb_id)
                        break;
        if (i >= ARRAY_SIZE(rc_configs))
                return 0;
        mixer->rc_cfg = &rc_configs[i];

        len = mixer->rc_cfg->packet_length;

        init_waitqueue_head(&mixer->rc_waitq);
        err = snd_hwdep_new(mixer->chip->card, "SB remote control", 0, &hwdep);
        if (err < 0)
                return err;
        snprintf(hwdep->name, sizeof(hwdep->name),
                 "%s remote control", mixer->chip->card->shortname);
        hwdep->iface = SNDRV_HWDEP_IFACE_SB_RC;
        hwdep->private_data = mixer;
        hwdep->ops.read = snd_usb_sbrc_hwdep_read;
        hwdep->ops.poll = snd_usb_sbrc_hwdep_poll;
        hwdep->exclusive = 1;

        mixer->rc_urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!mixer->rc_urb)
                return -ENOMEM;
        mixer->rc_setup_packet = kmalloc(sizeof(*mixer->rc_setup_packet), GFP_KERNEL);
        if (!mixer->rc_setup_packet) {
                usb_free_urb(mixer->rc_urb);
                mixer->rc_urb = NULL;
                return -ENOMEM;
        }
        mixer->rc_setup_packet->bRequestType =
                USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
        mixer->rc_setup_packet->bRequest = UAC_GET_MEM;
        mixer->rc_setup_packet->wValue = cpu_to_le16(0);
        mixer->rc_setup_packet->wIndex = cpu_to_le16(0);
        mixer->rc_setup_packet->wLength = cpu_to_le16(len);
        usb_fill_control_urb(mixer->rc_urb, mixer->chip->dev,
                             usb_rcvctrlpipe(mixer->chip->dev, 0),
                             (u8*)mixer->rc_setup_packet, mixer->rc_buffer, len,
                             snd_usb_soundblaster_remote_complete, mixer);
        return 0;
}

#define snd_audigy2nx_led_info          snd_ctl_boolean_mono_info

static int snd_audigy2nx_led_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.integer.value[0] = kcontrol->private_value >> 8;
        return 0;
}

static int snd_audigy2nx_led_update(struct usb_mixer_interface *mixer,
                                    int value, int index)
{
        struct snd_usb_audio *chip = mixer->chip;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        if (chip->usb_id == USB_ID(0x041e, 0x3042))
                err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0), 0x24,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                              !value, 0, NULL, 0);
        /* USB X-Fi S51 Pro */
        if (chip->usb_id == USB_ID(0x041e, 0x30df))
                err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0), 0x24,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                              !value, 0, NULL, 0);
        else
                err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0), 0x24,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                              value, index + 2, NULL, 0);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_audigy2nx_led_put(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct usb_mixer_interface *mixer = list->mixer;
        int index = kcontrol->private_value & 0xff;
        unsigned int value = ucontrol->value.integer.value[0];
        int old_value = kcontrol->private_value >> 8;
        int err;

        if (value > 1)
                return -EINVAL;
        if (value == old_value)
                return 0;
        kcontrol->private_value = (value << 8) | index;
        err = snd_audigy2nx_led_update(mixer, value, index);
        return err < 0 ? err : 1;
}

static int snd_audigy2nx_led_resume(struct usb_mixer_elem_list *list)
{
        int priv_value = list->kctl->private_value;

        return snd_audigy2nx_led_update(list->mixer, priv_value >> 8,
                                        priv_value & 0xff);
}

/* name and private_value are set dynamically */
static const struct snd_kcontrol_new snd_audigy2nx_control = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .info = snd_audigy2nx_led_info,
        .get = snd_audigy2nx_led_get,
        .put = snd_audigy2nx_led_put,
};

static const char * const snd_audigy2nx_led_names[] = {
        "CMSS LED Switch",
        "Power LED Switch",
        "Dolby Digital LED Switch",
};

static int snd_audigy2nx_controls_create(struct usb_mixer_interface *mixer)
{
        int i, err;

        for (i = 0; i < ARRAY_SIZE(snd_audigy2nx_led_names); ++i) {
                struct snd_kcontrol_new knew;

                /* USB X-Fi S51 doesn't have a CMSS LED */
                if ((mixer->chip->usb_id == USB_ID(0x041e, 0x3042)) && i == 0)
                        continue;
                /* USB X-Fi S51 Pro doesn't have one either */
                if ((mixer->chip->usb_id == USB_ID(0x041e, 0x30df)) && i == 0)
                        continue;
                if (i > 1 && /* Live24ext has 2 LEDs only */
                        (mixer->chip->usb_id == USB_ID(0x041e, 0x3040) ||
                         mixer->chip->usb_id == USB_ID(0x041e, 0x3042) ||
                         mixer->chip->usb_id == USB_ID(0x041e, 0x30df) ||
                         mixer->chip->usb_id == USB_ID(0x041e, 0x3048)))
                        break; 

                knew = snd_audigy2nx_control;
                knew.name = snd_audigy2nx_led_names[i];
                knew.private_value = (1 << 8) | i; /* LED on as default */
                err = add_single_ctl_with_resume(mixer, 0,
                                                 snd_audigy2nx_led_resume,
                                                 &knew, NULL);
                if (err < 0)
                        return err;
        }
        return 0;
}

static void snd_audigy2nx_proc_read(struct snd_info_entry *entry,
                                    struct snd_info_buffer *buffer)
{
        static const struct sb_jack {
                int unitid;
                const char *name;
        }  jacks_audigy2nx[] = {
                {4,  "dig in "},
                {7,  "line in"},
                {19, "spk out"},
                {20, "hph out"},
                {-1, NULL}
        }, jacks_live24ext[] = {
                {4,  "line in"}, /* &1=Line, &2=Mic*/
                {3,  "hph out"}, /* headphones */
                {0,  "RC     "}, /* last command, 6 bytes see rc_config above */
                {-1, NULL}
        };
        const struct sb_jack *jacks;
        struct usb_mixer_interface *mixer = entry->private_data;
        int i, err;
        u8 buf[3];

        snd_iprintf(buffer, "%s jacks\n\n", mixer->chip->card->shortname);
        if (mixer->chip->usb_id == USB_ID(0x041e, 0x3020))
                jacks = jacks_audigy2nx;
        else if (mixer->chip->usb_id == USB_ID(0x041e, 0x3040) ||
                 mixer->chip->usb_id == USB_ID(0x041e, 0x3048))
                jacks = jacks_live24ext;
        else
                return;

        for (i = 0; jacks[i].name; ++i) {
                snd_iprintf(buffer, "%s: ", jacks[i].name);
                err = snd_usb_lock_shutdown(mixer->chip);
                if (err < 0)
                        return;
                err = snd_usb_ctl_msg(mixer->chip->dev,
                                      usb_rcvctrlpipe(mixer->chip->dev, 0),
                                      UAC_GET_MEM, USB_DIR_IN | USB_TYPE_CLASS |
                                      USB_RECIP_INTERFACE, 0,
                                      jacks[i].unitid << 8, buf, 3);
                snd_usb_unlock_shutdown(mixer->chip);
                if (err == 3 && (buf[0] == 3 || buf[0] == 6))
                        snd_iprintf(buffer, "%02x %02x\n", buf[1], buf[2]);
                else
                        snd_iprintf(buffer, "?\n");
        }
}

/* EMU0204 */
static int snd_emu0204_ch_switch_info(struct snd_kcontrol *kcontrol,
                                      struct snd_ctl_elem_info *uinfo)
{
        static const char * const texts[2] = {"1/2", "3/4"};

        return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
}

static int snd_emu0204_ch_switch_get(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.enumerated.item[0] = kcontrol->private_value;
        return 0;
}

static int snd_emu0204_ch_switch_update(struct usb_mixer_interface *mixer,
                                        int value)
{
        struct snd_usb_audio *chip = mixer->chip;
        int err;
        unsigned char buf[2];

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        buf[0] = 0x01;
        buf[1] = value ? 0x02 : 0x01;
        err = snd_usb_ctl_msg(chip->dev,
                      usb_sndctrlpipe(chip->dev, 0), UAC_SET_CUR,
                      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
                      0x0400, 0x0e00, buf, 2);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_emu0204_ch_switch_put(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct usb_mixer_interface *mixer = list->mixer;
        unsigned int value = ucontrol->value.enumerated.item[0];
        int err;

        if (value > 1)
                return -EINVAL;

        if (value == kcontrol->private_value)
                return 0;

        kcontrol->private_value = value;
        err = snd_emu0204_ch_switch_update(mixer, value);
        return err < 0 ? err : 1;
}

static int snd_emu0204_ch_switch_resume(struct usb_mixer_elem_list *list)
{
        return snd_emu0204_ch_switch_update(list->mixer,
                                            list->kctl->private_value);
}

static const struct snd_kcontrol_new snd_emu0204_control = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Front Jack Channels",
        .info = snd_emu0204_ch_switch_info,
        .get = snd_emu0204_ch_switch_get,
        .put = snd_emu0204_ch_switch_put,
        .private_value = 0,
};

static int snd_emu0204_controls_create(struct usb_mixer_interface *mixer)
{
        return add_single_ctl_with_resume(mixer, 0,
                                          snd_emu0204_ch_switch_resume,
                                          &snd_emu0204_control, NULL);
}

/* ASUS Xonar U1 / U3 controls */

static int snd_xonar_u1_switch_get(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.integer.value[0] = !!(kcontrol->private_value & 0x02);
        return 0;
}

static int snd_xonar_u1_switch_update(struct usb_mixer_interface *mixer,
                                      unsigned char status)
{
        struct snd_usb_audio *chip = mixer->chip;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;
        err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0), 0x08,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                              50, 0, &status, 1);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_xonar_u1_switch_put(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        u8 old_status, new_status;
        int err;

        old_status = kcontrol->private_value;
        if (ucontrol->value.integer.value[0])
                new_status = old_status | 0x02;
        else
                new_status = old_status & ~0x02;
        if (new_status == old_status)
                return 0;

        kcontrol->private_value = new_status;
        err = snd_xonar_u1_switch_update(list->mixer, new_status);
        return err < 0 ? err : 1;
}

static int snd_xonar_u1_switch_resume(struct usb_mixer_elem_list *list)
{
        return snd_xonar_u1_switch_update(list->mixer,
                                          list->kctl->private_value);
}

static const struct snd_kcontrol_new snd_xonar_u1_output_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Digital Playback Switch",
        .info = snd_ctl_boolean_mono_info,
        .get = snd_xonar_u1_switch_get,
        .put = snd_xonar_u1_switch_put,
        .private_value = 0x05,
};

static int snd_xonar_u1_controls_create(struct usb_mixer_interface *mixer)
{
        return add_single_ctl_with_resume(mixer, 0,
                                          snd_xonar_u1_switch_resume,
                                          &snd_xonar_u1_output_switch, NULL);
}

/* Digidesign Mbox 1 clock source switch (internal/spdif) */

static int snd_mbox1_switch_get(struct snd_kcontrol *kctl,
                                struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.enumerated.item[0] = kctl->private_value;
        return 0;
}

static int snd_mbox1_switch_update(struct usb_mixer_interface *mixer, int val)
{
        struct snd_usb_audio *chip = mixer->chip;
        int err;
        unsigned char buff[3];

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        /* Prepare for magic command to toggle clock source */
        err = snd_usb_ctl_msg(chip->dev,
                                usb_rcvctrlpipe(chip->dev, 0), 0x81,
                                USB_DIR_IN |
                                USB_TYPE_CLASS |
                                USB_RECIP_INTERFACE, 0x00, 0x500, buff, 1);
        if (err < 0)
                goto err;
        err = snd_usb_ctl_msg(chip->dev,
                                usb_rcvctrlpipe(chip->dev, 0), 0x81,
                                USB_DIR_IN |
                                USB_TYPE_CLASS |
                                USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);
        if (err < 0)
                goto err;

        /* 2 possibilities:     Internal    -> send sample rate
         *                      S/PDIF sync -> send zeroes
         * NB: Sample rate locked to 48kHz on purpose to
         *     prevent user from resetting the sample rate
         *     while S/PDIF sync is enabled and confusing
         *     this configuration.
         */
        if (val == 0) {
                buff[0] = 0x80;
                buff[1] = 0xbb;
                buff[2] = 0x00;
        } else {
                buff[0] = buff[1] = buff[2] = 0x00;
        }

        /* Send the magic command to toggle the clock source */
        err = snd_usb_ctl_msg(chip->dev,
                                usb_sndctrlpipe(chip->dev, 0), 0x1,
                                USB_TYPE_CLASS |
                                USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);
        if (err < 0)
                goto err;
        err = snd_usb_ctl_msg(chip->dev,
                                usb_rcvctrlpipe(chip->dev, 0), 0x81,
                                USB_DIR_IN |
                                USB_TYPE_CLASS |
                                USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);
        if (err < 0)
                goto err;
        err = snd_usb_ctl_msg(chip->dev,
                                usb_rcvctrlpipe(chip->dev, 0), 0x81,
                                USB_DIR_IN |
                                USB_TYPE_CLASS |
                                USB_RECIP_ENDPOINT, 0x100, 0x2, buff, 3);
        if (err < 0)
                goto err;

err:
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_mbox1_switch_put(struct snd_kcontrol *kctl,
                                struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
        struct usb_mixer_interface *mixer = list->mixer;
        int err;
        bool cur_val, new_val;

        cur_val = kctl->private_value;
        new_val = ucontrol->value.enumerated.item[0];
        if (cur_val == new_val)
                return 0;

        kctl->private_value = new_val;
        err = snd_mbox1_switch_update(mixer, new_val);
        return err < 0 ? err : 1;
}

static int snd_mbox1_switch_info(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_info *uinfo)
{
        static const char *const texts[2] = {
                "Internal",
                "S/PDIF"
        };

        return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
}

static int snd_mbox1_switch_resume(struct usb_mixer_elem_list *list)
{
        return snd_mbox1_switch_update(list->mixer, list->kctl->private_value);
}

static const struct snd_kcontrol_new snd_mbox1_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Clock Source",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .info = snd_mbox1_switch_info,
        .get = snd_mbox1_switch_get,
        .put = snd_mbox1_switch_put,
        .private_value = 0
};

static int snd_mbox1_create_sync_switch(struct usb_mixer_interface *mixer)
{
        return add_single_ctl_with_resume(mixer, 0,
                                          snd_mbox1_switch_resume,
                                          &snd_mbox1_switch, NULL);
}

/* Native Instruments device quirks */

#define _MAKE_NI_CONTROL(bRequest,wIndex) ((bRequest) << 16 | (wIndex))

static int snd_ni_control_init_val(struct usb_mixer_interface *mixer,
                                   struct snd_kcontrol *kctl)
{
        struct usb_device *dev = mixer->chip->dev;
        unsigned int pval = kctl->private_value;
        u8 value;
        int err;

        err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
                              (pval >> 16) & 0xff,
                              USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
                              0, pval & 0xffff, &value, 1);
        if (err < 0) {
                dev_err(&dev->dev,
                        "unable to issue vendor read request (ret = %d)", err);
                return err;
        }

        kctl->private_value |= ((unsigned int)value << 24);
        return 0;
}

static int snd_nativeinstruments_control_get(struct snd_kcontrol *kcontrol,
                                             struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.integer.value[0] = kcontrol->private_value >> 24;
        return 0;
}

static int snd_ni_update_cur_val(struct usb_mixer_elem_list *list)
{
        struct snd_usb_audio *chip = list->mixer->chip;
        unsigned int pval = list->kctl->private_value;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;
        err = usb_control_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
                              (pval >> 16) & 0xff,
                              USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
                              pval >> 24, pval & 0xffff, NULL, 0, 1000);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_nativeinstruments_control_put(struct snd_kcontrol *kcontrol,
                                             struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        u8 oldval = (kcontrol->private_value >> 24) & 0xff;
        u8 newval = ucontrol->value.integer.value[0];
        int err;

        if (oldval == newval)
                return 0;

        kcontrol->private_value &= ~(0xff << 24);
        kcontrol->private_value |= (unsigned int)newval << 24;
        err = snd_ni_update_cur_val(list);
        return err < 0 ? err : 1;
}

static const struct snd_kcontrol_new snd_nativeinstruments_ta6_mixers[] = {
        {
                .name = "Direct Thru Channel A",
                .private_value = _MAKE_NI_CONTROL(0x01, 0x03),
        },
        {
                .name = "Direct Thru Channel B",
                .private_value = _MAKE_NI_CONTROL(0x01, 0x05),
        },
        {
                .name = "Phono Input Channel A",
                .private_value = _MAKE_NI_CONTROL(0x02, 0x03),
        },
        {
                .name = "Phono Input Channel B",
                .private_value = _MAKE_NI_CONTROL(0x02, 0x05),
        },
};

static const struct snd_kcontrol_new snd_nativeinstruments_ta10_mixers[] = {
        {
                .name = "Direct Thru Channel A",
                .private_value = _MAKE_NI_CONTROL(0x01, 0x03),
        },
        {
                .name = "Direct Thru Channel B",
                .private_value = _MAKE_NI_CONTROL(0x01, 0x05),
        },
        {
                .name = "Direct Thru Channel C",
                .private_value = _MAKE_NI_CONTROL(0x01, 0x07),
        },
        {
                .name = "Direct Thru Channel D",
                .private_value = _MAKE_NI_CONTROL(0x01, 0x09),
        },
        {
                .name = "Phono Input Channel A",
                .private_value = _MAKE_NI_CONTROL(0x02, 0x03),
        },
        {
                .name = "Phono Input Channel B",
                .private_value = _MAKE_NI_CONTROL(0x02, 0x05),
        },
        {
                .name = "Phono Input Channel C",
                .private_value = _MAKE_NI_CONTROL(0x02, 0x07),
        },
        {
                .name = "Phono Input Channel D",
                .private_value = _MAKE_NI_CONTROL(0x02, 0x09),
        },
};

static int snd_nativeinstruments_create_mixer(struct usb_mixer_interface *mixer,
                                              const struct snd_kcontrol_new *kc,
                                              unsigned int count)
{
        int i, err = 0;
        struct snd_kcontrol_new template = {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
                .get = snd_nativeinstruments_control_get,
                .put = snd_nativeinstruments_control_put,
                .info = snd_ctl_boolean_mono_info,
        };

        for (i = 0; i < count; i++) {
                struct usb_mixer_elem_list *list;

                template.name = kc[i].name;
                template.private_value = kc[i].private_value;

                err = add_single_ctl_with_resume(mixer, 0,
                                                 snd_ni_update_cur_val,
                                                 &template, &list);
                if (err < 0)
                        break;
                snd_ni_control_init_val(mixer, list->kctl);
        }

        return err;
}

/* M-Audio FastTrack Ultra quirks */
/* FTU Effect switch (also used by C400/C600) */
static int snd_ftu_eff_switch_info(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_info *uinfo)
{
        static const char *const texts[8] = {
                "Room 1", "Room 2", "Room 3", "Hall 1",
                "Hall 2", "Plate", "Delay", "Echo"
        };

        return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
}

static int snd_ftu_eff_switch_init(struct usb_mixer_interface *mixer,
                                   struct snd_kcontrol *kctl)
{
        struct usb_device *dev = mixer->chip->dev;
        unsigned int pval = kctl->private_value;
        int err;
        unsigned char value[2];

        value[0] = 0x00;
        value[1] = 0x00;

        err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
                              USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
                              pval & 0xff00,
                              snd_usb_ctrl_intf(mixer->chip) | ((pval & 0xff) << 8),
                              value, 2);
        if (err < 0)
                return err;

        kctl->private_value |= (unsigned int)value[0] << 24;
        return 0;
}

static int snd_ftu_eff_switch_get(struct snd_kcontrol *kctl,
                                        struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.enumerated.item[0] = kctl->private_value >> 24;
        return 0;
}

static int snd_ftu_eff_switch_update(struct usb_mixer_elem_list *list)
{
        struct snd_usb_audio *chip = list->mixer->chip;
        unsigned int pval = list->kctl->private_value;
        unsigned char value[2];
        int err;

        value[0] = pval >> 24;
        value[1] = 0;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;
        err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0),
                              UAC_SET_CUR,
                              USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
                              pval & 0xff00,
                              snd_usb_ctrl_intf(chip) | ((pval & 0xff) << 8),
                              value, 2);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_ftu_eff_switch_put(struct snd_kcontrol *kctl,
                                        struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
        unsigned int pval = list->kctl->private_value;
        int cur_val, err, new_val;

        cur_val = pval >> 24;
        new_val = ucontrol->value.enumerated.item[0];
        if (cur_val == new_val)
                return 0;

        kctl->private_value &= ~(0xff << 24);
        kctl->private_value |= new_val << 24;
        err = snd_ftu_eff_switch_update(list);
        return err < 0 ? err : 1;
}

static int snd_ftu_create_effect_switch(struct usb_mixer_interface *mixer,
        int validx, int bUnitID)
{
        static struct snd_kcontrol_new template = {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "Effect Program Switch",
                .index = 0,
                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
                .info = snd_ftu_eff_switch_info,
                .get = snd_ftu_eff_switch_get,
                .put = snd_ftu_eff_switch_put
        };
        struct usb_mixer_elem_list *list;
        int err;

        err = add_single_ctl_with_resume(mixer, bUnitID,
                                         snd_ftu_eff_switch_update,
                                         &template, &list);
        if (err < 0)
                return err;
        list->kctl->private_value = (validx << 8) | bUnitID;
        snd_ftu_eff_switch_init(mixer, list->kctl);
        return 0;
}

/* Create volume controls for FTU devices*/
static int snd_ftu_create_volume_ctls(struct usb_mixer_interface *mixer)
{
        char name[64];
        unsigned int control, cmask;
        int in, out, err;

        const unsigned int id = 5;
        const int val_type = USB_MIXER_S16;

        for (out = 0; out < 8; out++) {
                control = out + 1;
                for (in = 0; in < 8; in++) {
                        cmask = 1 << in;

                        snprintf(name, sizeof(name),
                                "AIn%d - Out%d Capture Volume",
                                in  + 1, out + 1);
                        err = snd_create_std_mono_ctl(mixer, id, control,
                                                        cmask, val_type, name,
                                                        &snd_usb_mixer_vol_tlv);
                        if (err < 0)
                                return err;
                }
                for (in = 8; in < 16; in++) {
                        cmask = 1 << in;
                        snprintf(name, sizeof(name),
                                "DIn%d - Out%d Playback Volume",
                                in - 7, out + 1);
                        err = snd_create_std_mono_ctl(mixer, id, control,
                                                        cmask, val_type, name,
                                                        &snd_usb_mixer_vol_tlv);
                        if (err < 0)
                                return err;
                }
        }

        return 0;
}

/* This control needs a volume quirk, see mixer.c */
static int snd_ftu_create_effect_volume_ctl(struct usb_mixer_interface *mixer)
{
        static const char name[] = "Effect Volume";
        const unsigned int id = 6;
        const int val_type = USB_MIXER_U8;
        const unsigned int control = 2;
        const unsigned int cmask = 0;

        return snd_create_std_mono_ctl(mixer, id, control, cmask, val_type,
                                        name, snd_usb_mixer_vol_tlv);
}

/* This control needs a volume quirk, see mixer.c */
static int snd_ftu_create_effect_duration_ctl(struct usb_mixer_interface *mixer)
{
        static const char name[] = "Effect Duration";
        const unsigned int id = 6;
        const int val_type = USB_MIXER_S16;
        const unsigned int control = 3;
        const unsigned int cmask = 0;

        return snd_create_std_mono_ctl(mixer, id, control, cmask, val_type,
                                        name, snd_usb_mixer_vol_tlv);
}

/* This control needs a volume quirk, see mixer.c */
static int snd_ftu_create_effect_feedback_ctl(struct usb_mixer_interface *mixer)
{
        static const char name[] = "Effect Feedback Volume";
        const unsigned int id = 6;
        const int val_type = USB_MIXER_U8;
        const unsigned int control = 4;
        const unsigned int cmask = 0;

        return snd_create_std_mono_ctl(mixer, id, control, cmask, val_type,
                                        name, NULL);
}

static int snd_ftu_create_effect_return_ctls(struct usb_mixer_interface *mixer)
{
        unsigned int cmask;
        int err, ch;
        char name[48];

        const unsigned int id = 7;
        const int val_type = USB_MIXER_S16;
        const unsigned int control = 7;

        for (ch = 0; ch < 4; ++ch) {
                cmask = 1 << ch;
                snprintf(name, sizeof(name),
                        "Effect Return %d Volume", ch + 1);
                err = snd_create_std_mono_ctl(mixer, id, control,
                                                cmask, val_type, name,
                                                snd_usb_mixer_vol_tlv);
                if (err < 0)
                        return err;
        }

        return 0;
}

static int snd_ftu_create_effect_send_ctls(struct usb_mixer_interface *mixer)
{
        unsigned int  cmask;
        int err, ch;
        char name[48];

        const unsigned int id = 5;
        const int val_type = USB_MIXER_S16;
        const unsigned int control = 9;

        for (ch = 0; ch < 8; ++ch) {
                cmask = 1 << ch;
                snprintf(name, sizeof(name),
                        "Effect Send AIn%d Volume", ch + 1);
                err = snd_create_std_mono_ctl(mixer, id, control, cmask,
                                                val_type, name,
                                                snd_usb_mixer_vol_tlv);
                if (err < 0)
                        return err;
        }
        for (ch = 8; ch < 16; ++ch) {
                cmask = 1 << ch;
                snprintf(name, sizeof(name),
                        "Effect Send DIn%d Volume", ch - 7);
                err = snd_create_std_mono_ctl(mixer, id, control, cmask,
                                                val_type, name,
                                                snd_usb_mixer_vol_tlv);
                if (err < 0)
                        return err;
        }
        return 0;
}

static int snd_ftu_create_mixer(struct usb_mixer_interface *mixer)
{
        int err;

        err = snd_ftu_create_volume_ctls(mixer);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_switch(mixer, 1, 6);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_volume_ctl(mixer);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_duration_ctl(mixer);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_feedback_ctl(mixer);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_return_ctls(mixer);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_send_ctls(mixer);
        if (err < 0)
                return err;

        return 0;
}

void snd_emuusb_set_samplerate(struct snd_usb_audio *chip,
                               unsigned char samplerate_id)
{
        struct usb_mixer_interface *mixer;
        struct usb_mixer_elem_info *cval;
        int unitid = 12; /* SampleRate ExtensionUnit ID */

        list_for_each_entry(mixer, &chip->mixer_list, list) {
                if (mixer->id_elems[unitid]) {
                        cval = mixer_elem_list_to_info(mixer->id_elems[unitid]);
                        snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR,
                                                    cval->control << 8,
                                                    samplerate_id);
                        snd_usb_mixer_notify_id(mixer, unitid);
                        break;
                }
        }
}

/* M-Audio Fast Track C400/C600 */
/* C400/C600 volume controls, this control needs a volume quirk, see mixer.c */
static int snd_c400_create_vol_ctls(struct usb_mixer_interface *mixer)
{
        char name[64];
        unsigned int cmask, offset;
        int out, chan, err;
        int num_outs = 0;
        int num_ins = 0;

        const unsigned int id = 0x40;
        const int val_type = USB_MIXER_S16;
        const int control = 1;

        switch (mixer->chip->usb_id) {
        case USB_ID(0x0763, 0x2030):
                num_outs = 6;
                num_ins = 4;
                break;
        case USB_ID(0x0763, 0x2031):
                num_outs = 8;
                num_ins = 6;
                break;
        }

        for (chan = 0; chan < num_outs + num_ins; chan++) {
                for (out = 0; out < num_outs; out++) {
                        if (chan < num_outs) {
                                snprintf(name, sizeof(name),
                                        "PCM%d-Out%d Playback Volume",
                                        chan + 1, out + 1);
                        } else {
                                snprintf(name, sizeof(name),
                                        "In%d-Out%d Playback Volume",
                                        chan - num_outs + 1, out + 1);
                        }

                        cmask = (out == 0) ? 0 : 1 << (out - 1);
                        offset = chan * num_outs;
                        err = snd_create_std_mono_ctl_offset(mixer, id, control,
                                                cmask, val_type, offset, name,
                                                &snd_usb_mixer_vol_tlv);
                        if (err < 0)
                                return err;
                }
        }

        return 0;
}

/* This control needs a volume quirk, see mixer.c */
static int snd_c400_create_effect_volume_ctl(struct usb_mixer_interface *mixer)
{
        static const char name[] = "Effect Volume";
        const unsigned int id = 0x43;
        const int val_type = USB_MIXER_U8;
        const unsigned int control = 3;
        const unsigned int cmask = 0;

        return snd_create_std_mono_ctl(mixer, id, control, cmask, val_type,
                                        name, snd_usb_mixer_vol_tlv);
}

/* This control needs a volume quirk, see mixer.c */
static int snd_c400_create_effect_duration_ctl(struct usb_mixer_interface *mixer)
{
        static const char name[] = "Effect Duration";
        const unsigned int id = 0x43;
        const int val_type = USB_MIXER_S16;
        const unsigned int control = 4;
        const unsigned int cmask = 0;

        return snd_create_std_mono_ctl(mixer, id, control, cmask, val_type,
                                        name, snd_usb_mixer_vol_tlv);
}

/* This control needs a volume quirk, see mixer.c */
static int snd_c400_create_effect_feedback_ctl(struct usb_mixer_interface *mixer)
{
        static const char name[] = "Effect Feedback Volume";
        const unsigned int id = 0x43;
        const int val_type = USB_MIXER_U8;
        const unsigned int control = 5;
        const unsigned int cmask = 0;

        return snd_create_std_mono_ctl(mixer, id, control, cmask, val_type,
                                        name, NULL);
}

static int snd_c400_create_effect_vol_ctls(struct usb_mixer_interface *mixer)
{
        char name[64];
        unsigned int cmask;
        int chan, err;
        int num_outs = 0;
        int num_ins = 0;

        const unsigned int id = 0x42;
        const int val_type = USB_MIXER_S16;
        const int control = 1;

        switch (mixer->chip->usb_id) {
        case USB_ID(0x0763, 0x2030):
                num_outs = 6;
                num_ins = 4;
                break;
        case USB_ID(0x0763, 0x2031):
                num_outs = 8;
                num_ins = 6;
                break;
        }

        for (chan = 0; chan < num_outs + num_ins; chan++) {
                if (chan < num_outs) {
                        snprintf(name, sizeof(name),
                                "Effect Send DOut%d",
                                chan + 1);
                } else {
                        snprintf(name, sizeof(name),
                                "Effect Send AIn%d",
                                chan - num_outs + 1);
                }

                cmask = (chan == 0) ? 0 : 1 << (chan - 1);
                err = snd_create_std_mono_ctl(mixer, id, control,
                                                cmask, val_type, name,
                                                &snd_usb_mixer_vol_tlv);
                if (err < 0)
                        return err;
        }

        return 0;
}

static int snd_c400_create_effect_ret_vol_ctls(struct usb_mixer_interface *mixer)
{
        char name[64];
        unsigned int cmask;
        int chan, err;
        int num_outs = 0;
        int offset = 0;

        const unsigned int id = 0x40;
        const int val_type = USB_MIXER_S16;
        const int control = 1;

        switch (mixer->chip->usb_id) {
        case USB_ID(0x0763, 0x2030):
                num_outs = 6;
                offset = 0x3c;
                /* { 0x3c, 0x43, 0x3e, 0x45, 0x40, 0x47 } */
                break;
        case USB_ID(0x0763, 0x2031):
                num_outs = 8;
                offset = 0x70;
                /* { 0x70, 0x79, 0x72, 0x7b, 0x74, 0x7d, 0x76, 0x7f } */
                break;
        }

        for (chan = 0; chan < num_outs; chan++) {
                snprintf(name, sizeof(name),
                        "Effect Return %d",
                        chan + 1);

                cmask = (chan == 0) ? 0 :
                        1 << (chan + (chan % 2) * num_outs - 1);
                err = snd_create_std_mono_ctl_offset(mixer, id, control,
                                                cmask, val_type, offset, name,
                                                &snd_usb_mixer_vol_tlv);
                if (err < 0)
                        return err;
        }

        return 0;
}

static int snd_c400_create_mixer(struct usb_mixer_interface *mixer)
{
        int err;

        err = snd_c400_create_vol_ctls(mixer);
        if (err < 0)
                return err;

        err = snd_c400_create_effect_vol_ctls(mixer);
        if (err < 0)
                return err;

        err = snd_c400_create_effect_ret_vol_ctls(mixer);
        if (err < 0)
                return err;

        err = snd_ftu_create_effect_switch(mixer, 2, 0x43);
        if (err < 0)
                return err;

        err = snd_c400_create_effect_volume_ctl(mixer);
        if (err < 0)
                return err;

        err = snd_c400_create_effect_duration_ctl(mixer);
        if (err < 0)
                return err;

        err = snd_c400_create_effect_feedback_ctl(mixer);
        if (err < 0)
                return err;

        return 0;
}

/*
 * The mixer units for Ebox-44 are corrupt, and even where they
 * are valid they presents mono controls as L and R channels of
 * stereo. So we provide a good mixer here.
 */
static const struct std_mono_table ebox44_table[] = {
        {
                .unitid = 4,
                .control = 1,
                .cmask = 0x0,
                .val_type = USB_MIXER_INV_BOOLEAN,
                .name = "Headphone Playback Switch"
        },
        {
                .unitid = 4,
                .control = 2,
                .cmask = 0x1,
                .val_type = USB_MIXER_S16,
                .name = "Headphone A Mix Playback Volume"
        },
        {
                .unitid = 4,
                .control = 2,
                .cmask = 0x2,
                .val_type = USB_MIXER_S16,
                .name = "Headphone B Mix Playback Volume"
        },

        {
                .unitid = 7,
                .control = 1,
                .cmask = 0x0,
                .val_type = USB_MIXER_INV_BOOLEAN,
                .name = "Output Playback Switch"
        },
        {
                .unitid = 7,
                .control = 2,
                .cmask = 0x1,
                .val_type = USB_MIXER_S16,
                .name = "Output A Playback Volume"
        },
        {
                .unitid = 7,
                .control = 2,
                .cmask = 0x2,
                .val_type = USB_MIXER_S16,
                .name = "Output B Playback Volume"
        },

        {
                .unitid = 10,
                .control = 1,
                .cmask = 0x0,
                .val_type = USB_MIXER_INV_BOOLEAN,
                .name = "Input Capture Switch"
        },
        {
                .unitid = 10,
                .control = 2,
                .cmask = 0x1,
                .val_type = USB_MIXER_S16,
                .name = "Input A Capture Volume"
        },
        {
                .unitid = 10,
                .control = 2,
                .cmask = 0x2,
                .val_type = USB_MIXER_S16,
                .name = "Input B Capture Volume"
        },

        {}
};

/* Audio Advantage Micro II findings:
 *
 * Mapping spdif AES bits to vendor register.bit:
 * AES0: [0 0 0 0 2.3 2.2 2.1 2.0] - default 0x00
 * AES1: [3.3 3.2.3.1.3.0 2.7 2.6 2.5 2.4] - default: 0x01
 * AES2: [0 0 0 0 0 0 0 0]
 * AES3: [0 0 0 0 0 0 x 0] - 'x' bit is set basing on standard usb request
 *                           (UAC_EP_CS_ATTR_SAMPLE_RATE) for Audio Devices
 *
 * power on values:
 * r2: 0x10
 * r3: 0x20 (b7 is zeroed just before playback (except IEC61937) and set
 *           just after it to 0xa0, presumably it disables/mutes some analog
 *           parts when there is no audio.)
 * r9: 0x28
 *
 * Optical transmitter on/off:
 * vendor register.bit: 9.1
 * 0 - on (0x28 register value)
 * 1 - off (0x2a register value)
 *
 */
static int snd_microii_spdif_info(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
        uinfo->count = 1;
        return 0;
}

static int snd_microii_spdif_default_get(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct snd_usb_audio *chip = list->mixer->chip;
        int err;
        struct usb_interface *iface;
        struct usb_host_interface *alts;
        unsigned int ep;
        unsigned char data[3];
        int rate;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        ucontrol->value.iec958.status[0] = kcontrol->private_value & 0xff;
        ucontrol->value.iec958.status[1] = (kcontrol->private_value >> 8) & 0xff;
        ucontrol->value.iec958.status[2] = 0x00;

        /* use known values for that card: interface#1 altsetting#1 */
        iface = usb_ifnum_to_if(chip->dev, 1);
        if (!iface || iface->num_altsetting < 2) {
                err = -EINVAL;
                goto end;
        }
        alts = &iface->altsetting[1];
        if (get_iface_desc(alts)->bNumEndpoints < 1) {
                err = -EINVAL;
                goto end;
        }
        ep = get_endpoint(alts, 0)->bEndpointAddress;

        err = snd_usb_ctl_msg(chip->dev,
                        usb_rcvctrlpipe(chip->dev, 0),
                        UAC_GET_CUR,
                        USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
                        UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
                        ep,
                        data,
                        sizeof(data));
        if (err < 0)
                goto end;

        rate = data[0] | (data[1] << 8) | (data[2] << 16);
        ucontrol->value.iec958.status[3] = (rate == 48000) ?
                        IEC958_AES3_CON_FS_48000 : IEC958_AES3_CON_FS_44100;

        err = 0;
 end:
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_microii_spdif_default_update(struct usb_mixer_elem_list *list)
{
        struct snd_usb_audio *chip = list->mixer->chip;
        unsigned int pval = list->kctl->private_value;
        u8 reg;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        reg = ((pval >> 4) & 0xf0) | (pval & 0x0f);
        err = snd_usb_ctl_msg(chip->dev,
                        usb_sndctrlpipe(chip->dev, 0),
                        UAC_SET_CUR,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                        reg,
                        2,
                        NULL,
                        0);
        if (err < 0)
                goto end;

        reg = (pval & IEC958_AES0_NONAUDIO) ? 0xa0 : 0x20;
        reg |= (pval >> 12) & 0x0f;
        err = snd_usb_ctl_msg(chip->dev,
                        usb_sndctrlpipe(chip->dev, 0),
                        UAC_SET_CUR,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                        reg,
                        3,
                        NULL,
                        0);
        if (err < 0)
                goto end;

 end:
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_microii_spdif_default_put(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        unsigned int pval, pval_old;
        int err;

        pval = pval_old = kcontrol->private_value;
        pval &= 0xfffff0f0;
        pval |= (ucontrol->value.iec958.status[1] & 0x0f) << 8;
        pval |= (ucontrol->value.iec958.status[0] & 0x0f);

        pval &= 0xffff0fff;
        pval |= (ucontrol->value.iec958.status[1] & 0xf0) << 8;

        /* The frequency bits in AES3 cannot be set via register access. */

        /* Silently ignore any bits from the request that cannot be set. */

        if (pval == pval_old)
                return 0;

        kcontrol->private_value = pval;
        err = snd_microii_spdif_default_update(list);
        return err < 0 ? err : 1;
}

static int snd_microii_spdif_mask_get(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.iec958.status[0] = 0x0f;
        ucontrol->value.iec958.status[1] = 0xff;
        ucontrol->value.iec958.status[2] = 0x00;
        ucontrol->value.iec958.status[3] = 0x00;

        return 0;
}

static int snd_microii_spdif_switch_get(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.integer.value[0] = !(kcontrol->private_value & 0x02);

        return 0;
}

static int snd_microii_spdif_switch_update(struct usb_mixer_elem_list *list)
{
        struct snd_usb_audio *chip = list->mixer->chip;
        u8 reg = list->kctl->private_value;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        err = snd_usb_ctl_msg(chip->dev,
                        usb_sndctrlpipe(chip->dev, 0),
                        UAC_SET_CUR,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
                        reg,
                        9,
                        NULL,
                        0);

        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_microii_spdif_switch_put(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        u8 reg;
        int err;

        reg = ucontrol->value.integer.value[0] ? 0x28 : 0x2a;
        if (reg != list->kctl->private_value)
                return 0;

        kcontrol->private_value = reg;
        err = snd_microii_spdif_switch_update(list);
        return err < 0 ? err : 1;
}

static const struct snd_kcontrol_new snd_microii_mixer_spdif[] = {
        {
                .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
                .name =     SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
                .info =     snd_microii_spdif_info,
                .get =      snd_microii_spdif_default_get,
                .put =      snd_microii_spdif_default_put,
                .private_value = 0x00000100UL,/* reset value */
        },
        {
                .access =   SNDRV_CTL_ELEM_ACCESS_READ,
                .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
                .name =     SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
                .info =     snd_microii_spdif_info,
                .get =      snd_microii_spdif_mask_get,
        },
        {
                .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
                .name =     SNDRV_CTL_NAME_IEC958("", PLAYBACK, SWITCH),
                .info =     snd_ctl_boolean_mono_info,
                .get =      snd_microii_spdif_switch_get,
                .put =      snd_microii_spdif_switch_put,
                .private_value = 0x00000028UL,/* reset value */
        }
};

static int snd_microii_controls_create(struct usb_mixer_interface *mixer)
{
        int err, i;
        static const usb_mixer_elem_resume_func_t resume_funcs[] = {
                snd_microii_spdif_default_update,
                NULL,
                snd_microii_spdif_switch_update
        };

        for (i = 0; i < ARRAY_SIZE(snd_microii_mixer_spdif); ++i) {
                err = add_single_ctl_with_resume(mixer, 0,
                                                 resume_funcs[i],
                                                 &snd_microii_mixer_spdif[i],
                                                 NULL);
                if (err < 0)
                        return err;
        }

        return 0;
}

/* Creative Sound Blaster E1 */

static int snd_soundblaster_e1_switch_get(struct snd_kcontrol *kcontrol,
                                          struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.integer.value[0] = kcontrol->private_value;
        return 0;
}

static int snd_soundblaster_e1_switch_update(struct usb_mixer_interface *mixer,
                                             unsigned char state)
{
        struct snd_usb_audio *chip = mixer->chip;
        int err;
        unsigned char buff[2];

        buff[0] = 0x02;
        buff[1] = state ? 0x02 : 0x00;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;
        err = snd_usb_ctl_msg(chip->dev,
                        usb_sndctrlpipe(chip->dev, 0), HID_REQ_SET_REPORT,
                        USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
                        0x0202, 3, buff, 2);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_soundblaster_e1_switch_put(struct snd_kcontrol *kcontrol,
                                          struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        unsigned char value = !!ucontrol->value.integer.value[0];
        int err;

        if (kcontrol->private_value == value)
                return 0;
        kcontrol->private_value = value;
        err = snd_soundblaster_e1_switch_update(list->mixer, value);
        return err < 0 ? err : 1;
}

static int snd_soundblaster_e1_switch_resume(struct usb_mixer_elem_list *list)
{
        return snd_soundblaster_e1_switch_update(list->mixer,
                                                 list->kctl->private_value);
}

static int snd_soundblaster_e1_switch_info(struct snd_kcontrol *kcontrol,
                                           struct snd_ctl_elem_info *uinfo)
{
        static const char *const texts[2] = {
                "Mic", "Aux"
        };

        return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
}

static const struct snd_kcontrol_new snd_soundblaster_e1_input_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Input Source",
        .info = snd_soundblaster_e1_switch_info,
        .get = snd_soundblaster_e1_switch_get,
        .put = snd_soundblaster_e1_switch_put,
        .private_value = 0,
};

static int snd_soundblaster_e1_switch_create(struct usb_mixer_interface *mixer)
{
        return add_single_ctl_with_resume(mixer, 0,
                                          snd_soundblaster_e1_switch_resume,
                                          &snd_soundblaster_e1_input_switch,
                                          NULL);
}

static void dell_dock_init_vol(struct snd_usb_audio *chip, int ch, int id)
{
        u16 buf = 0;

        snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC_SET_CUR,
                        USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
                        ch, snd_usb_ctrl_intf(chip) | (id << 8),
                        &buf, 2);
}

static int dell_dock_mixer_init(struct usb_mixer_interface *mixer)
{
        /* fix to 0dB playback volumes */
        dell_dock_init_vol(mixer->chip, 1, 16);
        dell_dock_init_vol(mixer->chip, 2, 16);
        dell_dock_init_vol(mixer->chip, 1, 19);
        dell_dock_init_vol(mixer->chip, 2, 19);
        return 0;
}

/* RME Class Compliant device quirks */

#define SND_RME_GET_STATUS1                     23
#define SND_RME_GET_CURRENT_FREQ                17
#define SND_RME_CLK_SYSTEM_SHIFT                16
#define SND_RME_CLK_SYSTEM_MASK                 0x1f
#define SND_RME_CLK_AES_SHIFT                   8
#define SND_RME_CLK_SPDIF_SHIFT                 12
#define SND_RME_CLK_AES_SPDIF_MASK              0xf
#define SND_RME_CLK_SYNC_SHIFT                  6
#define SND_RME_CLK_SYNC_MASK                   0x3
#define SND_RME_CLK_FREQMUL_SHIFT               18
#define SND_RME_CLK_FREQMUL_MASK                0x7
#define SND_RME_CLK_SYSTEM(x) \
        ((x >> SND_RME_CLK_SYSTEM_SHIFT) & SND_RME_CLK_SYSTEM_MASK)
#define SND_RME_CLK_AES(x) \
        ((x >> SND_RME_CLK_AES_SHIFT) & SND_RME_CLK_AES_SPDIF_MASK)
#define SND_RME_CLK_SPDIF(x) \
        ((x >> SND_RME_CLK_SPDIF_SHIFT) & SND_RME_CLK_AES_SPDIF_MASK)
#define SND_RME_CLK_SYNC(x) \
        ((x >> SND_RME_CLK_SYNC_SHIFT) & SND_RME_CLK_SYNC_MASK)
#define SND_RME_CLK_FREQMUL(x) \
        ((x >> SND_RME_CLK_FREQMUL_SHIFT) & SND_RME_CLK_FREQMUL_MASK)
#define SND_RME_CLK_AES_LOCK                    0x1
#define SND_RME_CLK_AES_SYNC                    0x4
#define SND_RME_CLK_SPDIF_LOCK                  0x2
#define SND_RME_CLK_SPDIF_SYNC                  0x8
#define SND_RME_SPDIF_IF_SHIFT                  4
#define SND_RME_SPDIF_FORMAT_SHIFT              5
#define SND_RME_BINARY_MASK                     0x1
#define SND_RME_SPDIF_IF(x) \
        ((x >> SND_RME_SPDIF_IF_SHIFT) & SND_RME_BINARY_MASK)
#define SND_RME_SPDIF_FORMAT(x) \
        ((x >> SND_RME_SPDIF_FORMAT_SHIFT) & SND_RME_BINARY_MASK)

static const u32 snd_rme_rate_table[] = {
        32000, 44100, 48000, 50000,
        64000, 88200, 96000, 100000,
        128000, 176400, 192000, 200000,
        256000, 352800, 384000, 400000,
        512000, 705600, 768000, 800000
};
/* maximum number of items for AES and S/PDIF rates for above table */
#define SND_RME_RATE_IDX_AES_SPDIF_NUM          12

enum snd_rme_domain {
        SND_RME_DOMAIN_SYSTEM,
        SND_RME_DOMAIN_AES,
        SND_RME_DOMAIN_SPDIF
};

enum snd_rme_clock_status {
        SND_RME_CLOCK_NOLOCK,
        SND_RME_CLOCK_LOCK,
        SND_RME_CLOCK_SYNC
};

static int snd_rme_read_value(struct snd_usb_audio *chip,
                              unsigned int item,
                              u32 *value)
{
        struct usb_device *dev = chip->dev;
        int err;

        err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
                              item,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, 0,
                              value, sizeof(*value));
        if (err < 0)
                dev_err(&dev->dev,
                        "unable to issue vendor read request %d (ret = %d)",
                        item, err);
        return err;
}

static int snd_rme_get_status1(struct snd_kcontrol *kcontrol,
                               u32 *status1)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct snd_usb_audio *chip = list->mixer->chip;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;
        err = snd_rme_read_value(chip, SND_RME_GET_STATUS1, status1);
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_rme_rate_get(struct snd_kcontrol *kcontrol,
                            struct snd_ctl_elem_value *ucontrol)
{
        u32 status1;
        u32 rate = 0;
        int idx;
        int err;

        err = snd_rme_get_status1(kcontrol, &status1);
        if (err < 0)
                return err;
        switch (kcontrol->private_value) {
        case SND_RME_DOMAIN_SYSTEM:
                idx = SND_RME_CLK_SYSTEM(status1);
                if (idx < ARRAY_SIZE(snd_rme_rate_table))
                        rate = snd_rme_rate_table[idx];
                break;
        case SND_RME_DOMAIN_AES:
                idx = SND_RME_CLK_AES(status1);
                if (idx < SND_RME_RATE_IDX_AES_SPDIF_NUM)
                        rate = snd_rme_rate_table[idx];
                break;
        case SND_RME_DOMAIN_SPDIF:
                idx = SND_RME_CLK_SPDIF(status1);
                if (idx < SND_RME_RATE_IDX_AES_SPDIF_NUM)
                        rate = snd_rme_rate_table[idx];
                break;
        default:
                return -EINVAL;
        }
        ucontrol->value.integer.value[0] = rate;
        return 0;
}

static int snd_rme_sync_state_get(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
{
        u32 status1;
        int idx = SND_RME_CLOCK_NOLOCK;
        int err;

        err = snd_rme_get_status1(kcontrol, &status1);
        if (err < 0)
                return err;
        switch (kcontrol->private_value) {
        case SND_RME_DOMAIN_AES:  /* AES */
                if (status1 & SND_RME_CLK_AES_SYNC)
                        idx = SND_RME_CLOCK_SYNC;
                else if (status1 & SND_RME_CLK_AES_LOCK)
                        idx = SND_RME_CLOCK_LOCK;
                break;
        case SND_RME_DOMAIN_SPDIF:  /* SPDIF */
                if (status1 & SND_RME_CLK_SPDIF_SYNC)
                        idx = SND_RME_CLOCK_SYNC;
                else if (status1 & SND_RME_CLK_SPDIF_LOCK)
                        idx = SND_RME_CLOCK_LOCK;
                break;
        default:
                return -EINVAL;
        }
        ucontrol->value.enumerated.item[0] = idx;
        return 0;
}

static int snd_rme_spdif_if_get(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_value *ucontrol)
{
        u32 status1;
        int err;

        err = snd_rme_get_status1(kcontrol, &status1);
        if (err < 0)
                return err;
        ucontrol->value.enumerated.item[0] = SND_RME_SPDIF_IF(status1);
        return 0;
}

static int snd_rme_spdif_format_get(struct snd_kcontrol *kcontrol,
                                    struct snd_ctl_elem_value *ucontrol)
{
        u32 status1;
        int err;

        err = snd_rme_get_status1(kcontrol, &status1);
        if (err < 0)
                return err;
        ucontrol->value.enumerated.item[0] = SND_RME_SPDIF_FORMAT(status1);
        return 0;
}

static int snd_rme_sync_source_get(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_value *ucontrol)
{
        u32 status1;

        int err;

        err = snd_rme_get_status1(kcontrol, &status1);
        if (err < 0)
                return err;
        ucontrol->value.enumerated.item[0] = SND_RME_CLK_SYNC(status1);
        return 0;
}

static int snd_rme_current_freq_get(struct snd_kcontrol *kcontrol,
                                    struct snd_ctl_elem_value *ucontrol)
{
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct snd_usb_audio *chip = list->mixer->chip;
        u32 status1;
        const u64 num = 104857600000000ULL;
        u32 den;
        unsigned int freq;
        int err;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;
        err = snd_rme_read_value(chip, SND_RME_GET_STATUS1, &status1);
        if (err < 0)
                goto end;
        err = snd_rme_read_value(chip, SND_RME_GET_CURRENT_FREQ, &den);
        if (err < 0)
                goto end;
        freq = (den == 0) ? 0 : div64_u64(num, den);
        freq <<= SND_RME_CLK_FREQMUL(status1);
        ucontrol->value.integer.value[0] = freq;

end:
        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_rme_rate_info(struct snd_kcontrol *kcontrol,
                             struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        switch (kcontrol->private_value) {
        case SND_RME_DOMAIN_SYSTEM:
                uinfo->value.integer.min = 32000;
                uinfo->value.integer.max = 800000;
                break;
        case SND_RME_DOMAIN_AES:
        case SND_RME_DOMAIN_SPDIF:
        default:
                uinfo->value.integer.min = 0;
                uinfo->value.integer.max = 200000;
        }
        uinfo->value.integer.step = 0;
        return 0;
}

static int snd_rme_sync_state_info(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_info *uinfo)
{
        static const char *const sync_states[] = {
                "No Lock", "Lock", "Sync"
        };

        return snd_ctl_enum_info(uinfo, 1,
                                 ARRAY_SIZE(sync_states), sync_states);
}

static int snd_rme_spdif_if_info(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_info *uinfo)
{
        static const char *const spdif_if[] = {
                "Coaxial", "Optical"
        };

        return snd_ctl_enum_info(uinfo, 1,
                                 ARRAY_SIZE(spdif_if), spdif_if);
}

static int snd_rme_spdif_format_info(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_info *uinfo)
{
        static const char *const optical_type[] = {
                "Consumer", "Professional"
        };

        return snd_ctl_enum_info(uinfo, 1,
                                 ARRAY_SIZE(optical_type), optical_type);
}

static int snd_rme_sync_source_info(struct snd_kcontrol *kcontrol,
                                    struct snd_ctl_elem_info *uinfo)
{
        static const char *const sync_sources[] = {
                "Internal", "AES", "SPDIF", "Internal"
        };

        return snd_ctl_enum_info(uinfo, 1,
                                 ARRAY_SIZE(sync_sources), sync_sources);
}

static const struct snd_kcontrol_new snd_rme_controls[] = {
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "AES Rate",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_rate_info,
                .get = snd_rme_rate_get,
                .private_value = SND_RME_DOMAIN_AES
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "AES Sync",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_sync_state_info,
                .get = snd_rme_sync_state_get,
                .private_value = SND_RME_DOMAIN_AES
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "SPDIF Rate",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_rate_info,
                .get = snd_rme_rate_get,
                .private_value = SND_RME_DOMAIN_SPDIF
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "SPDIF Sync",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_sync_state_info,
                .get = snd_rme_sync_state_get,
                .private_value = SND_RME_DOMAIN_SPDIF
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "SPDIF Interface",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_spdif_if_info,
                .get = snd_rme_spdif_if_get,
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "SPDIF Format",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_spdif_format_info,
                .get = snd_rme_spdif_format_get,
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "Sync Source",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_sync_source_info,
                .get = snd_rme_sync_source_get
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "System Rate",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_rate_info,
                .get = snd_rme_rate_get,
                .private_value = SND_RME_DOMAIN_SYSTEM
        },
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                .name = "Current Frequency",
                .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
                .info = snd_rme_rate_info,
                .get = snd_rme_current_freq_get
        }
};

static int snd_rme_controls_create(struct usb_mixer_interface *mixer)
{
        int err, i;

        for (i = 0; i < ARRAY_SIZE(snd_rme_controls); ++i) {
                err = add_single_ctl_with_resume(mixer, 0,
                                                 NULL,
                                                 &snd_rme_controls[i],
                                                 NULL);
                if (err < 0)
                        return err;
        }

        return 0;
}

/*
 * RME Babyface Pro (FS)
 *
 * These devices exposes a couple of DSP functions via request to EP0.
 * Switches are available via control registers, while routing is controlled
 * by controlling the volume on each possible crossing point.
 * Volume control is linear, from -inf (dec. 0) to +6dB (dec. 65536) with
 * 0dB being at dec. 32768.
 */
enum {
        SND_BBFPRO_CTL_REG1 = 0,
        SND_BBFPRO_CTL_REG2
};

#define SND_BBFPRO_CTL_REG_MASK 1
#define SND_BBFPRO_CTL_IDX_MASK 0xff
#define SND_BBFPRO_CTL_IDX_SHIFT 1
#define SND_BBFPRO_CTL_VAL_MASK 1
#define SND_BBFPRO_CTL_VAL_SHIFT 9
#define SND_BBFPRO_CTL_REG1_CLK_MASTER 0
#define SND_BBFPRO_CTL_REG1_CLK_OPTICAL 1
#define SND_BBFPRO_CTL_REG1_SPDIF_PRO 7
#define SND_BBFPRO_CTL_REG1_SPDIF_EMPH 8
#define SND_BBFPRO_CTL_REG1_SPDIF_OPTICAL 10
#define SND_BBFPRO_CTL_REG2_48V_AN1 0
#define SND_BBFPRO_CTL_REG2_48V_AN2 1
#define SND_BBFPRO_CTL_REG2_SENS_IN3 2
#define SND_BBFPRO_CTL_REG2_SENS_IN4 3
#define SND_BBFPRO_CTL_REG2_PAD_AN1 4
#define SND_BBFPRO_CTL_REG2_PAD_AN2 5

#define SND_BBFPRO_MIXER_IDX_MASK 0x1ff
#define SND_BBFPRO_MIXER_VAL_MASK 0x3ffff
#define SND_BBFPRO_MIXER_VAL_SHIFT 9
#define SND_BBFPRO_MIXER_VAL_MIN 0 // -inf
#define SND_BBFPRO_MIXER_VAL_MAX 65536 // +6dB

#define SND_BBFPRO_USBREQ_CTL_REG1 0x10
#define SND_BBFPRO_USBREQ_CTL_REG2 0x17
#define SND_BBFPRO_USBREQ_MIXER 0x12

static int snd_bbfpro_ctl_update(struct usb_mixer_interface *mixer, u8 reg,
                                 u8 index, u8 value)
{
        int err;
        u16 usb_req, usb_idx, usb_val;
        struct snd_usb_audio *chip = mixer->chip;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        if (reg == SND_BBFPRO_CTL_REG1) {
                usb_req = SND_BBFPRO_USBREQ_CTL_REG1;
                if (index == SND_BBFPRO_CTL_REG1_CLK_OPTICAL) {
                        usb_idx = 3;
                        usb_val = value ? 3 : 0;
                } else {
                        usb_idx = 1 << index;
                        usb_val = value ? usb_idx : 0;
                }
        } else {
                usb_req = SND_BBFPRO_USBREQ_CTL_REG2;
                usb_idx = 1 << index;
                usb_val = value ? usb_idx : 0;
        }

        err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0), usb_req,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              usb_val, usb_idx, NULL, 0);

        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_bbfpro_ctl_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        u8 reg, idx, val;
        int pv;

        pv = kcontrol->private_value;
        reg = pv & SND_BBFPRO_CTL_REG_MASK;
        idx = (pv >> SND_BBFPRO_CTL_IDX_SHIFT) & SND_BBFPRO_CTL_IDX_MASK;
        val = kcontrol->private_value >> SND_BBFPRO_CTL_VAL_SHIFT;

        if ((reg == SND_BBFPRO_CTL_REG1 &&
             idx == SND_BBFPRO_CTL_REG1_CLK_OPTICAL) ||
            (reg == SND_BBFPRO_CTL_REG2 &&
            (idx == SND_BBFPRO_CTL_REG2_SENS_IN3 ||
             idx == SND_BBFPRO_CTL_REG2_SENS_IN4))) {
                ucontrol->value.enumerated.item[0] = val;
        } else {
                ucontrol->value.integer.value[0] = val;
        }
        return 0;
}

static int snd_bbfpro_ctl_info(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_info *uinfo)
{
        u8 reg, idx;
        int pv;

        pv = kcontrol->private_value;
        reg = pv & SND_BBFPRO_CTL_REG_MASK;
        idx = (pv >> SND_BBFPRO_CTL_IDX_SHIFT) & SND_BBFPRO_CTL_IDX_MASK;

        if (reg == SND_BBFPRO_CTL_REG1 &&
            idx == SND_BBFPRO_CTL_REG1_CLK_OPTICAL) {
                static const char * const texts[2] = {
                        "AutoSync",
                        "Internal"
                };
                return snd_ctl_enum_info(uinfo, 1, 2, texts);
        } else if (reg == SND_BBFPRO_CTL_REG2 &&
                   (idx == SND_BBFPRO_CTL_REG2_SENS_IN3 ||
                    idx == SND_BBFPRO_CTL_REG2_SENS_IN4)) {
                static const char * const texts[2] = {
                        "-10dBV",
                        "+4dBu"
                };
                return snd_ctl_enum_info(uinfo, 1, 2, texts);
        }

        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 1;
        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
        return 0;
}

static int snd_bbfpro_ctl_put(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        int err;
        u8 reg, idx;
        int old_value, pv, val;

        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct usb_mixer_interface *mixer = list->mixer;

        pv = kcontrol->private_value;
        reg = pv & SND_BBFPRO_CTL_REG_MASK;
        idx = (pv >> SND_BBFPRO_CTL_IDX_SHIFT) & SND_BBFPRO_CTL_IDX_MASK;
        old_value = (pv >> SND_BBFPRO_CTL_VAL_SHIFT) & SND_BBFPRO_CTL_VAL_MASK;

        if ((reg == SND_BBFPRO_CTL_REG1 &&
             idx == SND_BBFPRO_CTL_REG1_CLK_OPTICAL) ||
            (reg == SND_BBFPRO_CTL_REG2 &&
            (idx == SND_BBFPRO_CTL_REG2_SENS_IN3 ||
             idx == SND_BBFPRO_CTL_REG2_SENS_IN4))) {
                val = ucontrol->value.enumerated.item[0];
        } else {
                val = ucontrol->value.integer.value[0];
        }

        if (val > 1)
                return -EINVAL;

        if (val == old_value)
                return 0;

        kcontrol->private_value = reg
                | ((idx & SND_BBFPRO_CTL_IDX_MASK) << SND_BBFPRO_CTL_IDX_SHIFT)
                | ((val & SND_BBFPRO_CTL_VAL_MASK) << SND_BBFPRO_CTL_VAL_SHIFT);

        err = snd_bbfpro_ctl_update(mixer, reg, idx, val);
        return err < 0 ? err : 1;
}

static int snd_bbfpro_ctl_resume(struct usb_mixer_elem_list *list)
{
        u8 reg, idx;
        int value, pv;

        pv = list->kctl->private_value;
        reg = pv & SND_BBFPRO_CTL_REG_MASK;
        idx = (pv >> SND_BBFPRO_CTL_IDX_SHIFT) & SND_BBFPRO_CTL_IDX_MASK;
        value = (pv >> SND_BBFPRO_CTL_VAL_SHIFT) & SND_BBFPRO_CTL_VAL_MASK;

        return snd_bbfpro_ctl_update(list->mixer, reg, idx, value);
}

static int snd_bbfpro_vol_update(struct usb_mixer_interface *mixer, u16 index,
                                 u32 value)
{
        struct snd_usb_audio *chip = mixer->chip;
        int err;
        u16 idx;
        u16 usb_idx, usb_val;
        u32 v;

        err = snd_usb_lock_shutdown(chip);
        if (err < 0)
                return err;

        idx = index & SND_BBFPRO_MIXER_IDX_MASK;
        // 18 bit linear volume, split so 2 bits end up in index.
        v = value & SND_BBFPRO_MIXER_VAL_MASK;
        usb_idx = idx | (v & 0x3) << 14;
        usb_val = (v >> 2) & 0xffff;

        err = snd_usb_ctl_msg(chip->dev,
                              usb_sndctrlpipe(chip->dev, 0),
                              SND_BBFPRO_USBREQ_MIXER,
                              USB_DIR_OUT | USB_TYPE_VENDOR |
                              USB_RECIP_DEVICE,
                              usb_val, usb_idx, NULL, 0);

        snd_usb_unlock_shutdown(chip);
        return err;
}

static int snd_bbfpro_vol_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.integer.value[0] =
                kcontrol->private_value >> SND_BBFPRO_MIXER_VAL_SHIFT;
        return 0;
}

static int snd_bbfpro_vol_info(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = SND_BBFPRO_MIXER_VAL_MIN;
        uinfo->value.integer.max = SND_BBFPRO_MIXER_VAL_MAX;
        return 0;
}

static int snd_bbfpro_vol_put(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        int err;
        u16 idx;
        u32 new_val, old_value, uvalue;
        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
        struct usb_mixer_interface *mixer = list->mixer;

        uvalue = ucontrol->value.integer.value[0];
        idx = kcontrol->private_value & SND_BBFPRO_MIXER_IDX_MASK;
        old_value = kcontrol->private_value >> SND_BBFPRO_MIXER_VAL_SHIFT;

        if (uvalue > SND_BBFPRO_MIXER_VAL_MAX)
                return -EINVAL;

        if (uvalue == old_value)
                return 0;

        new_val = uvalue & SND_BBFPRO_MIXER_VAL_MASK;

        kcontrol->private_value = idx
                | (new_val << SND_BBFPRO_MIXER_VAL_SHIFT);

        err = snd_bbfpro_vol_update(mixer, idx, new_val);
        return err < 0 ? err : 1;
}

static int snd_bbfpro_vol_resume(struct usb_mixer_elem_list *list)
{
        int pv = list->kctl->private_value;
        u16 idx = pv & SND_BBFPRO_MIXER_IDX_MASK;
        u32 val = (pv >> SND_BBFPRO_MIXER_VAL_SHIFT)
                & SND_BBFPRO_MIXER_VAL_MASK;
        return snd_bbfpro_vol_update(list->mixer, idx, val);
}

// Predfine elements
static const struct snd_kcontrol_new snd_bbfpro_ctl_control = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .index = 0,
        .info = snd_bbfpro_ctl_info,
        .get = snd_bbfpro_ctl_get,
        .put = snd_bbfpro_ctl_put
};

static const struct snd_kcontrol_new snd_bbfpro_vol_control = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .index = 0,
        .info = snd_bbfpro_vol_info,
        .get = snd_bbfpro_vol_get,
        .put = snd_bbfpro_vol_put
};

static int snd_bbfpro_ctl_add(struct usb_mixer_interface *mixer, u8 reg,
                              u8 index, char *name)
{
        struct snd_kcontrol_new knew = snd_bbfpro_ctl_control;

        knew.name = name;
        knew.private_value = (reg & SND_BBFPRO_CTL_REG_MASK)
                | ((index & SND_BBFPRO_CTL_IDX_MASK)
                        << SND_BBFPRO_CTL_IDX_SHIFT);

        return add_single_ctl_with_resume(mixer, 0, snd_bbfpro_ctl_resume,
                &knew, NULL);
}

static int snd_bbfpro_vol_add(struct usb_mixer_interface *mixer, u16 index,
                              char *name)
{
        struct snd_kcontrol_new knew = snd_bbfpro_vol_control;

        knew.name = name;
        knew.private_value = index & SND_BBFPRO_MIXER_IDX_MASK;

        return add_single_ctl_with_resume(mixer, 0, snd_bbfpro_vol_resume,
                &knew, NULL);
}

static int snd_bbfpro_controls_create(struct usb_mixer_interface *mixer)
{
        int err, i, o;
        char name[48];

        static const char * const input[] = {
                "AN1", "AN2", "IN3", "IN4", "AS1", "AS2", "ADAT3",
                "ADAT4", "ADAT5", "ADAT6", "ADAT7", "ADAT8"};

        static const char * const output[] = {
                "AN1", "AN2", "PH3", "PH4", "AS1", "AS2", "ADAT3", "ADAT4",
                "ADAT5", "ADAT6", "ADAT7", "ADAT8"};

        for (o = 0 ; o < 12 ; ++o) {
                for (i = 0 ; i < 12 ; ++i) {
                        // Line routing
                        snprintf(name, sizeof(name),
                                 "%s-%s-%s Playback Volume",
                                 (i < 2 ? "Mic" : "Line"),
                                 input[i], output[o]);
                        err = snd_bbfpro_vol_add(mixer, (26 * o + i), name);
                        if (err < 0)
                                return err;

                        // PCM routing... yes, it is output remapping
                        snprintf(name, sizeof(name),
                                 "PCM-%s-%s Playback Volume",
                                 output[i], output[o]);
                        err = snd_bbfpro_vol_add(mixer, (26 * o + 12 + i),
                                                 name);
                        if (err < 0)
                                return err;
                }
        }

        // Control Reg 1
        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG1,
                                 SND_BBFPRO_CTL_REG1_CLK_OPTICAL,
                                 "Sample Clock Source");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG1,
                                 SND_BBFPRO_CTL_REG1_SPDIF_PRO,
                                 "IEC958 Pro Mask");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG1,
                                 SND_BBFPRO_CTL_REG1_SPDIF_EMPH,
                                 "IEC958 Emphasis");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG1,
                                 SND_BBFPRO_CTL_REG1_SPDIF_OPTICAL,
                                 "IEC958 Switch");
        if (err < 0)
                return err;

        // Control Reg 2
        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG2,
                                 SND_BBFPRO_CTL_REG2_48V_AN1,
                                 "Mic-AN1 48V");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG2,
                                 SND_BBFPRO_CTL_REG2_48V_AN2,
                                 "Mic-AN2 48V");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG2,
                                 SND_BBFPRO_CTL_REG2_SENS_IN3,
                                 "Line-IN3 Sens.");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG2,
                                 SND_BBFPRO_CTL_REG2_SENS_IN4,
                                 "Line-IN4 Sens.");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG2,
                                 SND_BBFPRO_CTL_REG2_PAD_AN1,
                                 "Mic-AN1 PAD");
        if (err < 0)
                return err;

        err = snd_bbfpro_ctl_add(mixer, SND_BBFPRO_CTL_REG2,
                                 SND_BBFPRO_CTL_REG2_PAD_AN2,
                                 "Mic-AN2 PAD");
        if (err < 0)
                return err;

        return 0;
}

int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
{
        int err = 0;

        err = snd_usb_soundblaster_remote_init(mixer);
        if (err < 0)
                return err;

        switch (mixer->chip->usb_id) {
        /* Tascam US-16x08 */
        case USB_ID(0x0644, 0x8047):
                err = snd_us16x08_controls_create(mixer);
                break;
        case USB_ID(0x041e, 0x3020):
        case USB_ID(0x041e, 0x3040):
        case USB_ID(0x041e, 0x3042):
        case USB_ID(0x041e, 0x30df):
        case USB_ID(0x041e, 0x3048):
                err = snd_audigy2nx_controls_create(mixer);
                if (err < 0)
                        break;
                snd_card_ro_proc_new(mixer->chip->card, "audigy2nx",
                                     mixer, snd_audigy2nx_proc_read);
                break;

        /* EMU0204 */
        case USB_ID(0x041e, 0x3f19):
                err = snd_emu0204_controls_create(mixer);
                break;

        case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
        case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C400 */
                err = snd_c400_create_mixer(mixer);
                break;

        case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
        case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
                err = snd_ftu_create_mixer(mixer);
                break;

        case USB_ID(0x0b05, 0x1739): /* ASUS Xonar U1 */
        case USB_ID(0x0b05, 0x1743): /* ASUS Xonar U1 (2) */
        case USB_ID(0x0b05, 0x17a0): /* ASUS Xonar U3 */
                err = snd_xonar_u1_controls_create(mixer);
                break;

        case USB_ID(0x0d8c, 0x0103): /* Audio Advantage Micro II */
                err = snd_microii_controls_create(mixer);
                break;

        case USB_ID(0x0dba, 0x1000): /* Digidesign Mbox 1 */
                err = snd_mbox1_create_sync_switch(mixer);
                break;

        case USB_ID(0x17cc, 0x1011): /* Traktor Audio 6 */
                err = snd_nativeinstruments_create_mixer(mixer,
                                snd_nativeinstruments_ta6_mixers,
                                ARRAY_SIZE(snd_nativeinstruments_ta6_mixers));
                break;

        case USB_ID(0x17cc, 0x1021): /* Traktor Audio 10 */
                err = snd_nativeinstruments_create_mixer(mixer,
                                snd_nativeinstruments_ta10_mixers,
                                ARRAY_SIZE(snd_nativeinstruments_ta10_mixers));
                break;

        case USB_ID(0x200c, 0x1018): /* Electrix Ebox-44 */
                /* detection is disabled in mixer_maps.c */
                err = snd_create_std_mono_table(mixer, ebox44_table);
                break;

        case USB_ID(0x1235, 0x8012): /* Focusrite Scarlett 6i6 */
        case USB_ID(0x1235, 0x8002): /* Focusrite Scarlett 8i6 */
        case USB_ID(0x1235, 0x8004): /* Focusrite Scarlett 18i6 */
        case USB_ID(0x1235, 0x8014): /* Focusrite Scarlett 18i8 */
        case USB_ID(0x1235, 0x800c): /* Focusrite Scarlett 18i20 */
                err = snd_scarlett_controls_create(mixer);
                break;

        case USB_ID(0x1235, 0x8203): /* Focusrite Scarlett 6i6 2nd Gen */
        case USB_ID(0x1235, 0x8204): /* Focusrite Scarlett 18i8 2nd Gen */
        case USB_ID(0x1235, 0x8201): /* Focusrite Scarlett 18i20 2nd Gen */
                err = snd_scarlett_gen2_controls_create(mixer);
                break;

        case USB_ID(0x041e, 0x323b): /* Creative Sound Blaster E1 */
                err = snd_soundblaster_e1_switch_create(mixer);
                break;
        case USB_ID(0x0bda, 0x4014): /* Dell WD15 dock */
                err = dell_dock_mixer_init(mixer);
                break;

        case USB_ID(0x2a39, 0x3fd2): /* RME ADI-2 Pro */
        case USB_ID(0x2a39, 0x3fd3): /* RME ADI-2 DAC */
        case USB_ID(0x2a39, 0x3fd4): /* RME */
                err = snd_rme_controls_create(mixer);
                break;

        case USB_ID(0x0194f, 0x010c): /* Presonus Studio 1810c */
                err = snd_sc1810_init_mixer(mixer);
                break;
        case USB_ID(0x2a39, 0x3fb0): /* RME Babyface Pro FS */
                err = snd_bbfpro_controls_create(mixer);
                break;
        }

        return err;
}

#ifdef CONFIG_PM
void snd_usb_mixer_resume_quirk(struct usb_mixer_interface *mixer)
{
        switch (mixer->chip->usb_id) {
        case USB_ID(0x0bda, 0x4014): /* Dell WD15 dock */
                dell_dock_mixer_init(mixer);
                break;
        }
}
#endif

void snd_usb_mixer_rc_memory_change(struct usb_mixer_interface *mixer,
                                    int unitid)
{
        if (!mixer->rc_cfg)
                return;
        /* unit ids specific to Extigy/Audigy 2 NX: */
        switch (unitid) {
        case 0: /* remote control */
                mixer->rc_urb->dev = mixer->chip->dev;
                usb_submit_urb(mixer->rc_urb, GFP_ATOMIC);
                break;
        case 4: /* digital in jack */
        case 7: /* line in jacks */
        case 19: /* speaker out jacks */
        case 20: /* headphones out jack */
                break;
        /* live24ext: 4 = line-in jack */
        case 3: /* hp-out jack (may actuate Mute) */
                if (mixer->chip->usb_id == USB_ID(0x041e, 0x3040) ||
                    mixer->chip->usb_id == USB_ID(0x041e, 0x3048))
                        snd_usb_mixer_notify_id(mixer, mixer->rc_cfg->mute_mixer_id);
                break;
        default:
                usb_audio_dbg(mixer->chip, "memory change in unknown unit %d\n", unitid);
                break;
        }
}

static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
                                         struct usb_mixer_elem_info *cval,
                                         struct snd_kcontrol *kctl)
{
        /* Approximation using 10 ranges based on output measurement on hw v1.2.
         * This seems close to the cubic mapping e.g. alsamixer uses. */
        static const DECLARE_TLV_DB_RANGE(scale,
                 0,  1, TLV_DB_MINMAX_ITEM(-5300, -4970),
                 2,  5, TLV_DB_MINMAX_ITEM(-4710, -4160),
                 6,  7, TLV_DB_MINMAX_ITEM(-3884, -3710),
                 8, 14, TLV_DB_MINMAX_ITEM(-3443, -2560),
                15, 16, TLV_DB_MINMAX_ITEM(-2475, -2324),
                17, 19, TLV_DB_MINMAX_ITEM(-2228, -2031),
                20, 26, TLV_DB_MINMAX_ITEM(-1910, -1393),
                27, 31, TLV_DB_MINMAX_ITEM(-1322, -1032),
                32, 40, TLV_DB_MINMAX_ITEM(-968, -490),
                41, 50, TLV_DB_MINMAX_ITEM(-441, 0),
        );

        if (cval->min == 0 && cval->max == 50) {
                usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk (0-50 variant)\n");
                kctl->tlv.p = scale;
                kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
                kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;

        } else if (cval->min == 0 && cval->max <= 1000) {
                /* Some other clearly broken DragonFly variant.
                 * At least a 0..53 variant (hw v1.0) exists.
                 */
                usb_audio_info(mixer->chip, "ignoring too narrow dB range on a DragonFly device");
                kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
        }
}

void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
                                  struct usb_mixer_elem_info *cval, int unitid,
                                  struct snd_kcontrol *kctl)
{
        switch (mixer->chip->usb_id) {
        case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */
                if (unitid == 7 && cval->control == UAC_FU_VOLUME)
                        snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
                break;
        /* lowest playback value is muted on C-Media devices */
        case USB_ID(0x0d8c, 0x000c):
        case USB_ID(0x0d8c, 0x0014):
                if (strstr(kctl->id.name, "Playback"))
                        cval->min_mute = 1;
                break;
        }
}