OSCL-LXR linux-6.0.1/​sound/​usb/​mixer_quirks.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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/hda_verbs.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 helper functions */
 
 static int snd_mbox1_is_spdif_synced(struct snd_usb_audio *chip)
 {
     unsigned char buff[3];
     int err;
     int is_spdif_synced;
 
     /* Read clock source */
     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)
         return err;
 
     /* spdif sync: buff is all zeroes */
     is_spdif_synced = !(buff[0] | buff[1] | buff[2]);
     return is_spdif_synced;
 }
 
 static int snd_mbox1_set_clk_source(struct snd_usb_audio *chip, int rate_or_zero)
 {
     /* 2 possibilities: Internal    -> expects sample rate
      *          S/PDIF sync -> expects rate = 0
      */
     unsigned char buff[3];
 
     buff[0] = (rate_or_zero >>  0) & 0xff;
     buff[1] = (rate_or_zero >>  8) & 0xff;
     buff[2] = (rate_or_zero >> 16) & 0xff;
 
     /* Set clock source */
     return snd_usb_ctl_msg(chip->dev,
                    usb_sndctrlpipe(chip->dev, 0), 0x1,
                    USB_TYPE_CLASS |
                    USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);
 }
 
 static int snd_mbox1_is_spdif_input(struct snd_usb_audio *chip)
 {
     /* Hardware gives 2 possibilities:  ANALOG Source  -> 0x01
      *                  S/PDIF Source  -> 0x02
      */
     int err;
     unsigned char source[1];
 
     /* Read input 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, source, 1);
     if (err < 0)
         return err;
 
     return (source[0] == 2);
 }
 
 static int snd_mbox1_set_input_source(struct snd_usb_audio *chip, int is_spdif)
 {
     /* NB: Setting the input source to S/PDIF resets the clock source to S/PDIF
      * Hardware expects 2 possibilities:    ANALOG Source  -> 0x01
      *                  S/PDIF Source  -> 0x02
      */
     unsigned char buff[1];
 
     buff[0] = (is_spdif & 1) + 1;
 
     /* Set input source */
     return snd_usb_ctl_msg(chip->dev,
                    usb_sndctrlpipe(chip->dev, 0), 0x1,
                    USB_TYPE_CLASS |
                    USB_RECIP_INTERFACE, 0x00, 0x500, buff, 1);
 }
 
 /* Digidesign Mbox 1 clock source switch (internal/spdif) */
 
 static int snd_mbox1_clk_switch_get(struct snd_kcontrol *kctl,
                     struct snd_ctl_elem_value *ucontrol)
 {
     struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
     struct snd_usb_audio *chip = list->mixer->chip;
     int err;
 
     err = snd_usb_lock_shutdown(chip);
     if (err < 0)
         goto err;
 
     err = snd_mbox1_is_spdif_synced(chip);
     if (err < 0)
         goto err;
 
     kctl->private_value = err;
     err = 0;
     ucontrol->value.enumerated.item[0] = kctl->private_value;
 err:
     snd_usb_unlock_shutdown(chip);
     return err;
 }
 
 static int snd_mbox1_clk_switch_update(struct usb_mixer_interface *mixer, int is_spdif_sync)
 {
     struct snd_usb_audio *chip = mixer->chip;
     int err;
 
     err = snd_usb_lock_shutdown(chip);
     if (err < 0)
         return err;
 
     err = snd_mbox1_is_spdif_input(chip);
     if (err < 0)
         goto err;
 
     err = snd_mbox1_is_spdif_synced(chip);
     if (err < 0)
         goto err;
 
     /* FIXME: hardcoded sample rate */
     err = snd_mbox1_set_clk_source(chip, is_spdif_sync ? 0 : 48000);
     if (err < 0)
         goto err;
 
     err = snd_mbox1_is_spdif_synced(chip);
 err:
     snd_usb_unlock_shutdown(chip);
     return err;
 }
 
 static int snd_mbox1_clk_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_clk_switch_update(mixer, new_val);
     return err < 0 ? err : 1;
 }
 
 static int snd_mbox1_clk_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_clk_switch_resume(struct usb_mixer_elem_list *list)
 {
     return snd_mbox1_clk_switch_update(list->mixer, list->kctl->private_value);
 }
 
 /* Digidesign Mbox 1 input source switch (analog/spdif) */
 
 static int snd_mbox1_src_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_src_switch_update(struct usb_mixer_interface *mixer, int is_spdif_input)
 {
     struct snd_usb_audio *chip = mixer->chip;
     int err;
 
     err = snd_usb_lock_shutdown(chip);
     if (err < 0)
         return err;
 
     err = snd_mbox1_is_spdif_input(chip);
     if (err < 0)
         goto err;
 
     err = snd_mbox1_set_input_source(chip, is_spdif_input);
     if (err < 0)
         goto err;
 
     err = snd_mbox1_is_spdif_input(chip);
     if (err < 0)
         goto err;
 
     err = snd_mbox1_is_spdif_synced(chip);
 err:
     snd_usb_unlock_shutdown(chip);
     return err;
 }
 
 static int snd_mbox1_src_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_src_switch_update(mixer, new_val);
     return err < 0 ? err : 1;
 }
 
 static int snd_mbox1_src_switch_info(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
 {
     static const char *const texts[2] = {
         "Analog",
         "S/PDIF"
     };
 
     return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
 }
 
 static int snd_mbox1_src_switch_resume(struct usb_mixer_elem_list *list)
 {
     return snd_mbox1_src_switch_update(list->mixer, list->kctl->private_value);
 }
 
 static const struct snd_kcontrol_new snd_mbox1_clk_switch = {
     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
     .name = "Clock Source",
     .index = 0,
     .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
     .info = snd_mbox1_clk_switch_info,
     .get = snd_mbox1_clk_switch_get,
     .put = snd_mbox1_clk_switch_put,
     .private_value = 0
 };
 
 static const struct snd_kcontrol_new snd_mbox1_src_switch = {
     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
     .name = "Input Source",
     .index = 1,
     .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
     .info = snd_mbox1_src_switch_info,
     .get = snd_mbox1_src_switch_get,
     .put = snd_mbox1_src_switch_put,
     .private_value = 0
 };
 
 static int snd_mbox1_controls_create(struct usb_mixer_interface *mixer)
 {
     int err;
     err = add_single_ctl_with_resume(mixer, 0,
                      snd_mbox1_clk_switch_resume,
                      &snd_mbox1_clk_switch, NULL);
     if (err < 0)
         return err;
 
     return add_single_ctl_with_resume(mixer, 1,
                       snd_mbox1_src_switch_resume,
                       &snd_mbox1_src_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);
 }
 
 /*
  * Dell WD15 dock jack detection
  *
  * The WD15 contains an ALC4020 USB audio controller and ALC3263 audio codec
  * from Realtek. It is a UAC 1 device, and UAC 1 does not support jack
  * detection. Instead, jack detection works by sending HD Audio commands over
  * vendor-type USB messages.
  */
 
 #define HDA_VERB_CMD(V, N, D) (((N) << 20) | ((V) << 8) | (D))
 
 #define REALTEK_HDA_VALUE 0x0038
 
 #define REALTEK_HDA_SET     62
 #define REALTEK_MANUAL_MODE 72
 #define REALTEK_HDA_GET_OUT 88
 #define REALTEK_HDA_GET_IN  89
 
 #define REALTEK_AUDIO_FUNCTION_GROUP    0x01
 #define REALTEK_LINE1           0x1a
 #define REALTEK_VENDOR_REGISTERS    0x20
 #define REALTEK_HP_OUT          0x21
 
 #define REALTEK_CBJ_CTRL2 0x50
 
 #define REALTEK_JACK_INTERRUPT_NODE 5
 
 #define REALTEK_MIC_FLAG 0x100
 
 static int realtek_hda_set(struct snd_usb_audio *chip, u32 cmd)
 {
     struct usb_device *dev = chip->dev;
     __be32 buf = cpu_to_be32(cmd);
 
     return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), REALTEK_HDA_SET,
                    USB_RECIP_DEVICE | USB_TYPE_VENDOR | USB_DIR_OUT,
                    REALTEK_HDA_VALUE, 0, &buf, sizeof(buf));
 }
 
 static int realtek_hda_get(struct snd_usb_audio *chip, u32 cmd, u32 *value)
 {
     struct usb_device *dev = chip->dev;
     int err;
     __be32 buf = cpu_to_be32(cmd);
 
     err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), REALTEK_HDA_GET_OUT,
                   USB_RECIP_DEVICE | USB_TYPE_VENDOR | USB_DIR_OUT,
                   REALTEK_HDA_VALUE, 0, &buf, sizeof(buf));
     if (err < 0)
         return err;
     err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), REALTEK_HDA_GET_IN,
                   USB_RECIP_DEVICE | USB_TYPE_VENDOR | USB_DIR_IN,
                   REALTEK_HDA_VALUE, 0, &buf, sizeof(buf));
     if (err < 0)
         return err;
 
     *value = be32_to_cpu(buf);
     return 0;
 }
 
 static int realtek_ctl_connector_get(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
 {
     struct usb_mixer_elem_info *cval = kcontrol->private_data;
     struct snd_usb_audio *chip = cval->head.mixer->chip;
     u32 pv = kcontrol->private_value;
     u32 node_id = pv & 0xff;
     u32 sense;
     u32 cbj_ctrl2;
     bool presence;
     int err;
 
     err = snd_usb_lock_shutdown(chip);
     if (err < 0)
         return err;
     err = realtek_hda_get(chip,
                   HDA_VERB_CMD(AC_VERB_GET_PIN_SENSE, node_id, 0),
                   &sense);
     if (err < 0)
         goto err;
     if (pv & REALTEK_MIC_FLAG) {
         err = realtek_hda_set(chip,
                       HDA_VERB_CMD(AC_VERB_SET_COEF_INDEX,
                            REALTEK_VENDOR_REGISTERS,
                            REALTEK_CBJ_CTRL2));
         if (err < 0)
             goto err;
         err = realtek_hda_get(chip,
                       HDA_VERB_CMD(AC_VERB_GET_PROC_COEF,
                            REALTEK_VENDOR_REGISTERS, 0),
                       &cbj_ctrl2);
         if (err < 0)
             goto err;
     }
 err:
     snd_usb_unlock_shutdown(chip);
     if (err < 0)
         return err;
 
     presence = sense & AC_PINSENSE_PRESENCE;
     if (pv & REALTEK_MIC_FLAG)
         presence = presence && (cbj_ctrl2 & 0x0070) == 0x0070;
     ucontrol->value.integer.value[0] = presence;
     return 0;
 }
 
 static const struct snd_kcontrol_new realtek_connector_ctl_ro = {
     .iface = SNDRV_CTL_ELEM_IFACE_CARD,
     .name = "", /* will be filled later manually */
     .access = SNDRV_CTL_ELEM_ACCESS_READ,
     .info = snd_ctl_boolean_mono_info,
     .get = realtek_ctl_connector_get,
 };
 
 static int realtek_resume_jack(struct usb_mixer_elem_list *list)
 {
     snd_ctl_notify(list->mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                &list->kctl->id);
     return 0;
 }
 
 static int realtek_add_jack(struct usb_mixer_interface *mixer,
                 char *name, u32 val)
 {
     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,
                     REALTEK_JACK_INTERRUPT_NODE);
     cval->head.resume = realtek_resume_jack;
     cval->val_type = USB_MIXER_BOOLEAN;
     cval->channels = 1;
     cval->min = 0;
     cval->max = 1;
     kctl = snd_ctl_new1(&realtek_connector_ctl_ro, cval);
     if (!kctl) {
         kfree(cval);
         return -ENOMEM;
     }
     kctl->private_value = val;
     strscpy(kctl->id.name, name, sizeof(kctl->id.name));
     kctl->private_free = snd_usb_mixer_elem_free;
     return snd_usb_mixer_add_control(&cval->head, kctl);
 }
 
 static int dell_dock_mixer_create(struct usb_mixer_interface *mixer)
 {
     int err;
     struct usb_device *dev = mixer->chip->dev;
 
     /* Power down the audio codec to avoid loud pops in the next step. */
     realtek_hda_set(mixer->chip,
             HDA_VERB_CMD(AC_VERB_SET_POWER_STATE,
                      REALTEK_AUDIO_FUNCTION_GROUP,
                      AC_PWRST_D3));
 
     /*
      * Turn off 'manual mode' in case it was enabled. This removes the need
      * to power cycle the dock after it was attached to a Windows machine.
      */
     snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), REALTEK_MANUAL_MODE,
             USB_RECIP_DEVICE | USB_TYPE_VENDOR | USB_DIR_OUT,
             0, 0, NULL, 0);
 
     err = realtek_add_jack(mixer, "Line Out Jack", REALTEK_LINE1);
     if (err < 0)
         return err;
     err = realtek_add_jack(mixer, "Headphone Jack", REALTEK_HP_OUT);
     if (err < 0)
         return err;
     err = realtek_add_jack(mixer, "Headset Mic Jack",
                    REALTEK_HP_OUT | REALTEK_MIC_FLAG);
     if (err < 0)
         return err;
     return 0;
 }
 
 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,
             (UAC_FU_VOLUME << 8) | 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;
 }
 
 /*
  * Pioneer DJ DJM Mixers
  *
  * These devices generally have options for soft-switching the playback and
  * capture sources in addition to the recording level. Although different
  * devices have different configurations, there seems to be canonical values
  * for specific capture/playback types:  See the definitions of these below.
  *
  * The wValue is masked with the stereo channel number. e.g. Setting Ch2 to
  * capture phono would be 0x0203. Capture, playback and capture level have
  * different wIndexes.
  */
 
 // Capture types
 #define SND_DJM_CAP_LINE    0x00
 #define SND_DJM_CAP_CDLINE  0x01
 #define SND_DJM_CAP_DIGITAL 0x02
 #define SND_DJM_CAP_PHONO   0x03
 #define SND_DJM_CAP_PFADER  0x06
 #define SND_DJM_CAP_XFADERA 0x07
 #define SND_DJM_CAP_XFADERB 0x08
 #define SND_DJM_CAP_MIC     0x09
 #define SND_DJM_CAP_AUX     0x0d
 #define SND_DJM_CAP_RECOUT  0x0a
 #define SND_DJM_CAP_NONE    0x0f
 #define SND_DJM_CAP_CH1PFADER   0x11
 #define SND_DJM_CAP_CH2PFADER   0x12
 #define SND_DJM_CAP_CH3PFADER   0x13
 #define SND_DJM_CAP_CH4PFADER   0x14
 
 // Playback types
 #define SND_DJM_PB_CH1      0x00
 #define SND_DJM_PB_CH2      0x01
 #define SND_DJM_PB_AUX      0x04
 
 #define SND_DJM_WINDEX_CAP  0x8002
 #define SND_DJM_WINDEX_CAPLVL   0x8003
 #define SND_DJM_WINDEX_PB   0x8016
 
 // kcontrol->private_value layout
 #define SND_DJM_VALUE_MASK  0x0000ffff
 #define SND_DJM_GROUP_MASK  0x00ff0000
 #define SND_DJM_DEVICE_MASK 0xff000000
 #define SND_DJM_GROUP_SHIFT 16
 #define SND_DJM_DEVICE_SHIFT    24
 
 // device table index
 // used for the snd_djm_devices table, so please update accordingly
 #define SND_DJM_250MK2_IDX  0x0
 #define SND_DJM_750_IDX     0x1
 #define SND_DJM_850_IDX     0x2
 #define SND_DJM_900NXS2_IDX 0x3
 #define SND_DJM_750MK2_IDX  0x4
 
 
 #define SND_DJM_CTL(_name, suffix, _default_value, _windex) { \
     .name = _name, \
     .options = snd_djm_opts_##suffix, \
     .noptions = ARRAY_SIZE(snd_djm_opts_##suffix), \
     .default_value = _default_value, \
     .wIndex = _windex }
 
 #define SND_DJM_DEVICE(suffix) { \
     .controls = snd_djm_ctls_##suffix, \
     .ncontrols = ARRAY_SIZE(snd_djm_ctls_##suffix) }
 
 
 struct snd_djm_device {
     const char *name;
     const struct snd_djm_ctl *controls;
     size_t ncontrols;
 };
 
 struct snd_djm_ctl {
     const char *name;
     const u16 *options;
     size_t noptions;
     u16 default_value;
     u16 wIndex;
 };
 
 static const char *snd_djm_get_label_caplevel(u16 wvalue)
 {
     switch (wvalue) {
     case 0x0000:    return "-19dB";
     case 0x0100:    return "-15dB";
     case 0x0200:    return "-10dB";
     case 0x0300:    return "-5dB";
     default:    return NULL;
     }
 };
 
 static const char *snd_djm_get_label_cap_common(u16 wvalue)
 {
     switch (wvalue & 0x00ff) {
     case SND_DJM_CAP_LINE:      return "Control Tone LINE";
     case SND_DJM_CAP_CDLINE:    return "Control Tone CD/LINE";
     case SND_DJM_CAP_DIGITAL:   return "Control Tone DIGITAL";
     case SND_DJM_CAP_PHONO:     return "Control Tone PHONO";
     case SND_DJM_CAP_PFADER:    return "Post Fader";
     case SND_DJM_CAP_XFADERA:   return "Cross Fader A";
     case SND_DJM_CAP_XFADERB:   return "Cross Fader B";
     case SND_DJM_CAP_MIC:       return "Mic";
     case SND_DJM_CAP_RECOUT:    return "Rec Out";
     case SND_DJM_CAP_AUX:       return "Aux";
     case SND_DJM_CAP_NONE:      return "None";
     case SND_DJM_CAP_CH1PFADER: return "Post Fader Ch1";
     case SND_DJM_CAP_CH2PFADER: return "Post Fader Ch2";
     case SND_DJM_CAP_CH3PFADER: return "Post Fader Ch3";
     case SND_DJM_CAP_CH4PFADER: return "Post Fader Ch4";
     default:            return NULL;
     }
 };
 
 // The DJM-850 has different values for CD/LINE and LINE capture
 // control options than the other DJM declared in this file.
 static const char *snd_djm_get_label_cap_850(u16 wvalue)
 {
     switch (wvalue & 0x00ff) {
     case 0x00:      return "Control Tone CD/LINE";
     case 0x01:      return "Control Tone LINE";
     default:        return snd_djm_get_label_cap_common(wvalue);
     }
 };
 
 static const char *snd_djm_get_label_cap(u8 device_idx, u16 wvalue)
 {
     switch (device_idx) {
     case SND_DJM_850_IDX:       return snd_djm_get_label_cap_850(wvalue);
     default:            return snd_djm_get_label_cap_common(wvalue);
     }
 };
 
 static const char *snd_djm_get_label_pb(u16 wvalue)
 {
     switch (wvalue & 0x00ff) {
     case SND_DJM_PB_CH1:    return "Ch1";
     case SND_DJM_PB_CH2:    return "Ch2";
     case SND_DJM_PB_AUX:    return "Aux";
     default:        return NULL;
     }
 };
 
 static const char *snd_djm_get_label(u8 device_idx, u16 wvalue, u16 windex)
 {
     switch (windex) {
     case SND_DJM_WINDEX_CAPLVL: return snd_djm_get_label_caplevel(wvalue);
     case SND_DJM_WINDEX_CAP:    return snd_djm_get_label_cap(device_idx, wvalue);
     case SND_DJM_WINDEX_PB:     return snd_djm_get_label_pb(wvalue);
     default:            return NULL;
     }
 };
 
 // common DJM capture level option values
 static const u16 snd_djm_opts_cap_level[] = {
     0x0000, 0x0100, 0x0200, 0x0300 };
 
 
 // DJM-250MK2
 static const u16 snd_djm_opts_250mk2_cap1[] = {
     0x0103, 0x0100, 0x0106, 0x0107, 0x0108, 0x0109, 0x010d, 0x010a };
 
 static const u16 snd_djm_opts_250mk2_cap2[] = {
     0x0203, 0x0200, 0x0206, 0x0207, 0x0208, 0x0209, 0x020d, 0x020a };
 
 static const u16 snd_djm_opts_250mk2_cap3[] = {
     0x030a, 0x0311, 0x0312, 0x0307, 0x0308, 0x0309, 0x030d };
 
 static const u16 snd_djm_opts_250mk2_pb1[] = { 0x0100, 0x0101, 0x0104 };
 static const u16 snd_djm_opts_250mk2_pb2[] = { 0x0200, 0x0201, 0x0204 };
 static const u16 snd_djm_opts_250mk2_pb3[] = { 0x0300, 0x0301, 0x0304 };
 
 static const struct snd_djm_ctl snd_djm_ctls_250mk2[] = {
     SND_DJM_CTL("Capture Level", cap_level, 0, SND_DJM_WINDEX_CAPLVL),
     SND_DJM_CTL("Ch1 Input",   250mk2_cap1, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch2 Input",   250mk2_cap2, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch3 Input",   250mk2_cap3, 0, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch1 Output",   250mk2_pb1, 0, SND_DJM_WINDEX_PB),
     SND_DJM_CTL("Ch2 Output",   250mk2_pb2, 1, SND_DJM_WINDEX_PB),
     SND_DJM_CTL("Ch3 Output",   250mk2_pb3, 2, SND_DJM_WINDEX_PB)
 };
 
 
 // DJM-750
 static const u16 snd_djm_opts_750_cap1[] = {
     0x0101, 0x0103, 0x0106, 0x0107, 0x0108, 0x0109, 0x010a, 0x010f };
 static const u16 snd_djm_opts_750_cap2[] = {
     0x0200, 0x0201, 0x0206, 0x0207, 0x0208, 0x0209, 0x020a, 0x020f };
 static const u16 snd_djm_opts_750_cap3[] = {
     0x0300, 0x0301, 0x0306, 0x0307, 0x0308, 0x0309, 0x030a, 0x030f };
 static const u16 snd_djm_opts_750_cap4[] = {
     0x0401, 0x0403, 0x0406, 0x0407, 0x0408, 0x0409, 0x040a, 0x040f };
 
 static const struct snd_djm_ctl snd_djm_ctls_750[] = {
     SND_DJM_CTL("Capture Level", cap_level, 0, SND_DJM_WINDEX_CAPLVL),
     SND_DJM_CTL("Ch1 Input",   750_cap1, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch2 Input",   750_cap2, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch3 Input",   750_cap3, 0, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch4 Input",   750_cap4, 0, SND_DJM_WINDEX_CAP)
 };
 
 
 // DJM-850
 static const u16 snd_djm_opts_850_cap1[] = {
     0x0100, 0x0103, 0x0106, 0x0107, 0x0108, 0x0109, 0x010a, 0x010f };
 static const u16 snd_djm_opts_850_cap2[] = {
     0x0200, 0x0201, 0x0206, 0x0207, 0x0208, 0x0209, 0x020a, 0x020f };
 static const u16 snd_djm_opts_850_cap3[] = {
     0x0300, 0x0301, 0x0306, 0x0307, 0x0308, 0x0309, 0x030a, 0x030f };
 static const u16 snd_djm_opts_850_cap4[] = {
     0x0400, 0x0403, 0x0406, 0x0407, 0x0408, 0x0409, 0x040a, 0x040f };
 
 static const struct snd_djm_ctl snd_djm_ctls_850[] = {
     SND_DJM_CTL("Capture Level", cap_level, 0, SND_DJM_WINDEX_CAPLVL),
     SND_DJM_CTL("Ch1 Input",   850_cap1, 1, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch2 Input",   850_cap2, 0, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch3 Input",   850_cap3, 0, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch4 Input",   850_cap4, 1, SND_DJM_WINDEX_CAP)
 };
 
 
 // DJM-900NXS2
 static const u16 snd_djm_opts_900nxs2_cap1[] = {
     0x0100, 0x0102, 0x0103, 0x0106, 0x0107, 0x0108, 0x0109, 0x010a };
 static const u16 snd_djm_opts_900nxs2_cap2[] = {
     0x0200, 0x0202, 0x0203, 0x0206, 0x0207, 0x0208, 0x0209, 0x020a };
 static const u16 snd_djm_opts_900nxs2_cap3[] = {
     0x0300, 0x0302, 0x0303, 0x0306, 0x0307, 0x0308, 0x0309, 0x030a };
 static const u16 snd_djm_opts_900nxs2_cap4[] = {
     0x0400, 0x0402, 0x0403, 0x0406, 0x0407, 0x0408, 0x0409, 0x040a };
 static const u16 snd_djm_opts_900nxs2_cap5[] = {
     0x0507, 0x0508, 0x0509, 0x050a, 0x0511, 0x0512, 0x0513, 0x0514 };
 
 static const struct snd_djm_ctl snd_djm_ctls_900nxs2[] = {
     SND_DJM_CTL("Capture Level", cap_level, 0, SND_DJM_WINDEX_CAPLVL),
     SND_DJM_CTL("Ch1 Input",   900nxs2_cap1, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch2 Input",   900nxs2_cap2, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch3 Input",   900nxs2_cap3, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch4 Input",   900nxs2_cap4, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch5 Input",   900nxs2_cap5, 3, SND_DJM_WINDEX_CAP)
 };
 
 // DJM-750MK2
 static const u16 snd_djm_opts_750mk2_cap1[] = {
     0x0100, 0x0102, 0x0103, 0x0106, 0x0107, 0x0108, 0x0109, 0x010a };
 static const u16 snd_djm_opts_750mk2_cap2[] = {
     0x0200, 0x0202, 0x0203, 0x0206, 0x0207, 0x0208, 0x0209, 0x020a };
 static const u16 snd_djm_opts_750mk2_cap3[] = {
     0x0300, 0x0302, 0x0303, 0x0306, 0x0307, 0x0308, 0x0309, 0x030a };
 static const u16 snd_djm_opts_750mk2_cap4[] = {
     0x0400, 0x0402, 0x0403, 0x0406, 0x0407, 0x0408, 0x0409, 0x040a };
 static const u16 snd_djm_opts_750mk2_cap5[] = {
     0x0507, 0x0508, 0x0509, 0x050a, 0x0511, 0x0512, 0x0513, 0x0514 };
 
 static const u16 snd_djm_opts_750mk2_pb1[] = { 0x0100, 0x0101, 0x0104 };
 static const u16 snd_djm_opts_750mk2_pb2[] = { 0x0200, 0x0201, 0x0204 };
 static const u16 snd_djm_opts_750mk2_pb3[] = { 0x0300, 0x0301, 0x0304 };
 
 
 static const struct snd_djm_ctl snd_djm_ctls_750mk2[] = {
     SND_DJM_CTL("Capture Level", cap_level, 0, SND_DJM_WINDEX_CAPLVL),
     SND_DJM_CTL("Ch1 Input",   750mk2_cap1, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch2 Input",   750mk2_cap2, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch3 Input",   750mk2_cap3, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch4 Input",   750mk2_cap4, 2, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch5 Input",   750mk2_cap5, 3, SND_DJM_WINDEX_CAP),
     SND_DJM_CTL("Ch1 Output",   750mk2_pb1, 0, SND_DJM_WINDEX_PB),
     SND_DJM_CTL("Ch2 Output",   750mk2_pb2, 1, SND_DJM_WINDEX_PB),
     SND_DJM_CTL("Ch3 Output",   750mk2_pb3, 2, SND_DJM_WINDEX_PB)
 };
 
 
 static const struct snd_djm_device snd_djm_devices[] = {
     [SND_DJM_250MK2_IDX] = SND_DJM_DEVICE(250mk2),
     [SND_DJM_750_IDX] = SND_DJM_DEVICE(750),
     [SND_DJM_850_IDX] = SND_DJM_DEVICE(850),
     [SND_DJM_900NXS2_IDX] = SND_DJM_DEVICE(900nxs2),
     [SND_DJM_750MK2_IDX] = SND_DJM_DEVICE(750mk2),
 };
 
 
 static int snd_djm_controls_info(struct snd_kcontrol *kctl,
                 struct snd_ctl_elem_info *info)
 {
     unsigned long private_value = kctl->private_value;
     u8 device_idx = (private_value & SND_DJM_DEVICE_MASK) >> SND_DJM_DEVICE_SHIFT;
     u8 ctl_idx = (private_value & SND_DJM_GROUP_MASK) >> SND_DJM_GROUP_SHIFT;
     const struct snd_djm_device *device = &snd_djm_devices[device_idx];
     const char *name;
     const struct snd_djm_ctl *ctl;
     size_t noptions;
 
     if (ctl_idx >= device->ncontrols)
         return -EINVAL;
 
     ctl = &device->controls[ctl_idx];
     noptions = ctl->noptions;
     if (info->value.enumerated.item >= noptions)
         info->value.enumerated.item = noptions - 1;
 
     name = snd_djm_get_label(device_idx,
                 ctl->options[info->value.enumerated.item],
                 ctl->wIndex);
     if (!name)
         return -EINVAL;
 
     strscpy(info->value.enumerated.name, name, sizeof(info->value.enumerated.name));
     info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
     info->count = 1;
     info->value.enumerated.items = noptions;
     return 0;
 }
 
 static int snd_djm_controls_update(struct usb_mixer_interface *mixer,
                 u8 device_idx, u8 group, u16 value)
 {
     int err;
     const struct snd_djm_device *device = &snd_djm_devices[device_idx];
 
     if ((group >= device->ncontrols) || value >= device->controls[group].noptions)
         return -EINVAL;
 
     err = snd_usb_lock_shutdown(mixer->chip);
     if (err)
         return err;
 
     err = snd_usb_ctl_msg(
         mixer->chip->dev, usb_sndctrlpipe(mixer->chip->dev, 0),
         USB_REQ_SET_FEATURE,
         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
         device->controls[group].options[value],
         device->controls[group].wIndex,
         NULL, 0);
 
     snd_usb_unlock_shutdown(mixer->chip);
     return err;
 }
 
 static int snd_djm_controls_get(struct snd_kcontrol *kctl,
                 struct snd_ctl_elem_value *elem)
 {
     elem->value.enumerated.item[0] = kctl->private_value & SND_DJM_VALUE_MASK;
     return 0;
 }
 
 static int snd_djm_controls_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *elem)
 {
     struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
     struct usb_mixer_interface *mixer = list->mixer;
     unsigned long private_value = kctl->private_value;
 
     u8 device = (private_value & SND_DJM_DEVICE_MASK) >> SND_DJM_DEVICE_SHIFT;
     u8 group = (private_value & SND_DJM_GROUP_MASK) >> SND_DJM_GROUP_SHIFT;
     u16 value = elem->value.enumerated.item[0];
 
     kctl->private_value = (((unsigned long)device << SND_DJM_DEVICE_SHIFT) |
                   (group << SND_DJM_GROUP_SHIFT) |
                   value);
 
     return snd_djm_controls_update(mixer, device, group, value);
 }
 
 static int snd_djm_controls_resume(struct usb_mixer_elem_list *list)
 {
     unsigned long private_value = list->kctl->private_value;
     u8 device = (private_value & SND_DJM_DEVICE_MASK) >> SND_DJM_DEVICE_SHIFT;
     u8 group = (private_value & SND_DJM_GROUP_MASK) >> SND_DJM_GROUP_SHIFT;
     u16 value = (private_value & SND_DJM_VALUE_MASK);
 
     return snd_djm_controls_update(list->mixer, device, group, value);
 }
 
 static int snd_djm_controls_create(struct usb_mixer_interface *mixer,
         const u8 device_idx)
 {
     int err, i;
     u16 value;
 
     const struct snd_djm_device *device = &snd_djm_devices[device_idx];
 
     struct snd_kcontrol_new knew = {
         .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
         .index = 0,
         .info = snd_djm_controls_info,
         .get  = snd_djm_controls_get,
         .put  = snd_djm_controls_put
     };
 
     for (i = 0; i < device->ncontrols; i++) {
         value = device->controls[i].default_value;
         knew.name = device->controls[i].name;
         knew.private_value = (
             ((unsigned long)device_idx << SND_DJM_DEVICE_SHIFT) |
             (i << SND_DJM_GROUP_SHIFT) |
             value);
         err = snd_djm_controls_update(mixer, device_idx, i, value);
         if (err)
             return err;
         err = add_single_ctl_with_resume(mixer, 0, snd_djm_controls_resume,
                          &knew, NULL);
         if (err)
             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_controls_create(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 */
     case USB_ID(0x1235, 0x8211): /* Focusrite Scarlett Solo 3rd Gen */
     case USB_ID(0x1235, 0x8210): /* Focusrite Scarlett 2i2 3rd Gen */
     case USB_ID(0x1235, 0x8212): /* Focusrite Scarlett 4i4 3rd Gen */
     case USB_ID(0x1235, 0x8213): /* Focusrite Scarlett 8i6 3rd Gen */
     case USB_ID(0x1235, 0x8214): /* Focusrite Scarlett 18i8 3rd Gen */
     case USB_ID(0x1235, 0x8215): /* Focusrite Scarlett 18i20 3rd Gen */
     case USB_ID(0x1235, 0x820c): /* Focusrite Clarett+ 8Pre */
         err = snd_scarlett_gen2_init(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_create(mixer);
         if (err < 0)
             break;
         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(0x194f, 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;
     case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
         err = snd_djm_controls_create(mixer, SND_DJM_250MK2_IDX);
         break;
     case USB_ID(0x08e4, 0x017f): /* Pioneer DJ DJM-750 */
         err = snd_djm_controls_create(mixer, SND_DJM_750_IDX);
         break;
     case USB_ID(0x2b73, 0x001b): /* Pioneer DJ DJM-750MK2 */
         err = snd_djm_controls_create(mixer, SND_DJM_750MK2_IDX);
         break;
     case USB_ID(0x08e4, 0x0163): /* Pioneer DJ DJM-850 */
         err = snd_djm_controls_create(mixer, SND_DJM_850_IDX);
         break;
     case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
         err = snd_djm_controls_create(mixer, SND_DJM_900NXS2_IDX);
         break;
     }
 
     return err;
 }
 
 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;
     }
 }
 
 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 some devices */
     case USB_ID(0x0d8c, 0x000c): /* C-Media */
     case USB_ID(0x0d8c, 0x0014): /* C-Media */
     case USB_ID(0x19f7, 0x0003): /* RODE NT-USB */
         if (strstr(kctl->id.name, "Playback"))
             cval->min_mute = 1;
         break;
     }
 }