4 files changed, 114 insertions, 88 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index a4fbfff63191..41650d5b93b7 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -138,7 +138,7 @@ check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 
 /* ignore the error value if ignore_ctl_error flag is set */
 #define filter_error(cval, err) \
-        ((cval)->mixer->ignore_ctl_error ? 0 : (err))
+        ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
 
 /* check whether the control should be ignored */
 static inline int
@@ -290,13 +290,13 @@ static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
                             int validx, int *value_ret)
 {
-        struct snd_usb_audio *chip = cval->mixer->chip;
+        struct snd_usb_audio *chip = cval->head.mixer->chip;
         unsigned char buf[2];
         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
         int timeout = 10;
         int idx = 0, err;
 
-        err = snd_usb_autoresume(cval->mixer->chip);
+        err = snd_usb_autoresume(chip);
         if (err < 0)
                 return -EIO;
 
@@ -304,7 +304,7 @@ static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
         while (timeout-- > 0) {
                 if (chip->shutdown)
                         break;
-                idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
+                idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
                 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
                                     validx, idx, buf, val_len) >= val_len) {
@@ -320,14 +320,14 @@ static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
 
  out:
         up_read(&chip->shutdown_rwsem);
-        snd_usb_autosuspend(cval->mixer->chip);
+        snd_usb_autosuspend(chip);
         return err;
 }
 
 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
                             int validx, int *value_ret)
 {
-        struct snd_usb_audio *chip = cval->mixer->chip;
+        struct snd_usb_audio *chip = cval->head.mixer->chip;
         unsigned char buf[2 + 3 * sizeof(__u16)]; /* enough space for one range */
         unsigned char *val;
         int idx = 0, ret, size;
@@ -351,7 +351,7 @@ static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
         if (chip->shutdown) {
                 ret = -ENODEV;
         } else {
-                idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
+                idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
                               validx, idx, buf, size);
@@ -396,7 +396,7 @@ static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
 {
         validx += cval->idx_off;
 
-        return (cval->mixer->protocol == UAC_VERSION_1) ?
+        return (cval->head.mixer->protocol == UAC_VERSION_1) ?
                 get_ctl_value_v1(cval, request, validx, value_ret) :
                 get_ctl_value_v2(cval, request, validx, value_ret);
 }
@@ -427,8 +427,8 @@ int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
         }
         err = get_cur_mix_raw(cval, channel, value);
         if (err < 0) {
-                if (!cval->mixer->ignore_ctl_error)
-                        usb_audio_dbg(cval->mixer->chip,
+                if (!cval->head.mixer->ignore_ctl_error)
+                        usb_audio_dbg(cval->head.mixer->chip,
                                 "cannot get current value for control %d ch %d: err = %d\n",
                                       cval->control, channel, err);
                 return err;
@@ -445,13 +445,13 @@ int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
                                 int request, int validx, int value_set)
 {
-        struct snd_usb_audio *chip = cval->mixer->chip;
+        struct snd_usb_audio *chip = cval->head.mixer->chip;
         unsigned char buf[2];
         int idx = 0, val_len, err, timeout = 10;
 
         validx += cval->idx_off;
 
-        if (cval->mixer->protocol == UAC_VERSION_1) {
+        if (cval->head.mixer->protocol == UAC_VERSION_1) {
                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
         } else { /* UAC_VERSION_2 */
                 /* audio class v2 controls are always 2 bytes in size */
@@ -476,7 +476,7 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
         while (timeout-- > 0) {
                 if (chip->shutdown)
                         break;
-                idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
+                idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
                 if (snd_usb_ctl_msg(chip->dev,
                                     usb_sndctrlpipe(chip->dev, 0), request,
                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
@@ -510,7 +510,7 @@ int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
                 cval->ch_readonly & (1 << (channel - 1));
 
         if (read_only) {
-                usb_audio_dbg(cval->mixer->chip,
+                usb_audio_dbg(cval->head.mixer->chip,
                               "%s(): channel %d of control %d is read_only\n",
                             __func__, channel, cval->control);
                 return 0;
@@ -569,10 +569,10 @@ static int check_matrix_bitmap(unsigned char *bmap,
  * if failed, give up and free the control instance.
  */
 
-int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
+int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
                               struct snd_kcontrol *kctl)
 {
-        struct usb_mixer_elem_info *cval = kctl->private_data;
+        struct usb_mixer_interface *mixer = list->mixer;
         int err;
 
         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
@@ -582,9 +582,9 @@ int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
                               err);
                 return err;
         }
-        cval->elem_id = &kctl->id;
-        cval->next_id_elem = mixer->id_elems[cval->id];
-        mixer->id_elems[cval->id] = cval;
+        list->kctl = kctl;
+        list->next_id_elem = mixer->id_elems[list->id];
+        mixer->id_elems[list->id] = list;
         return 0;
 }
 
@@ -833,7 +833,7 @@ void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
                                   struct snd_kcontrol *kctl)
 {
-        struct snd_usb_audio *chip = cval->mixer->chip;
+        struct snd_usb_audio *chip = cval->head.mixer->chip;
         switch (chip->usb_id) {
         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
@@ -958,10 +958,10 @@ static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
                 }
                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
-                        usb_audio_err(cval->mixer->chip,
+                        usb_audio_err(cval->head.mixer->chip,
                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
-                                   cval->id, snd_usb_ctrl_intf(cval->mixer->chip),
-                                                               cval->control, cval->id);
+                                   cval->head.id, snd_usb_ctrl_intf(cval->head.mixer->chip),
+                                                               cval->control, cval->head.id);
                         return -EINVAL;
                 }
                 if (get_ctl_value(cval, UAC_GET_RES,
@@ -1065,7 +1065,7 @@ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
                                 kcontrol->vd[0].access &= 
                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
-                                snd_ctl_notify(cval->mixer->chip->card,
+                                snd_ctl_notify(cval->head.mixer->chip->card,
                                                SNDRV_CTL_EVENT_MASK_INFO,
                                                &kcontrol->id);
                         }
@@ -1235,8 +1235,7 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
         if (!cval)
                 return;
-        cval->mixer = state->mixer;
-        cval->id = unitid;
+        snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
         cval->control = control;
         cval->cmask = ctl_mask;
         cval->val_type = audio_feature_info[control-1].type;
@@ -1347,14 +1346,14 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
                                range);
                 usb_audio_warn(state->chip,
                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
-                               cval->id, kctl->id.name, cval->channels,
+                               cval->head.id, kctl->id.name, cval->channels,
                                cval->min, cval->max, cval->res);
         }
 
         usb_audio_dbg(state->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
-                      cval->id, kctl->id.name, cval->channels,
+                      cval->head.id, kctl->id.name, cval->channels,
                       cval->min, cval->max, cval->res);
-        snd_usb_mixer_add_control(state->mixer, kctl);
+        snd_usb_mixer_add_control(&cval->head, kctl);
 }
 
 /*
@@ -1528,8 +1527,7 @@ static void build_mixer_unit_ctl(struct mixer_build *state,
         if (!cval)
                 return;
 
-        cval->mixer = state->mixer;
-        cval->id = unitid;
+        snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
         cval->control = in_ch + 1; /* based on 1 */
         cval->val_type = USB_MIXER_S16;
         for (i = 0; i < num_outs; i++) {
@@ -1561,8 +1559,8 @@ static void build_mixer_unit_ctl(struct mixer_build *state,
         append_ctl_name(kctl, " Volume");
 
         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
-                    cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
-        snd_usb_mixer_add_control(state->mixer, kctl);
+                    cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
+        snd_usb_mixer_add_control(&cval->head, kctl);
 }
 
 /*
@@ -1812,8 +1810,7 @@ static int build_audio_procunit(struct mixer_build *state, int unitid,
                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
                 if (!cval)
                         return -ENOMEM;
-                cval->mixer = state->mixer;
-                cval->id = unitid;
+                snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
                 cval->control = valinfo->control;
                 cval->val_type = valinfo->val_type;
                 cval->channels = 1;
@@ -1866,10 +1863,10 @@ static int build_audio_procunit(struct mixer_build *state, int unitid,
 
                 usb_audio_dbg(state->chip,
                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
-                              cval->id, kctl->id.name, cval->channels,
+                              cval->head.id, kctl->id.name, cval->channels,
                               cval->min, cval->max);
 
-                err = snd_usb_mixer_add_control(state->mixer, kctl);
+                err = snd_usb_mixer_add_control(&cval->head, kctl);
                 if (err < 0)
                         return err;
         }
@@ -2016,8 +2013,7 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
         if (!cval)
                 return -ENOMEM;
-        cval->mixer = state->mixer;
-        cval->id = unitid;
+        snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
         cval->val_type = USB_MIXER_U8;
         cval->channels = 1;
         cval->min = 1;
@@ -2088,11 +2084,8 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
         }
 
         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
-                    cval->id, kctl->id.name, desc->bNrInPins);
-        if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
-                return err;
-
-        return 0;
+                    cval->head.id, kctl->id.name, desc->bNrInPins);
+        return snd_usb_mixer_add_control(&cval->head, kctl);
 }
 
 /*
@@ -2237,25 +2230,21 @@ static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
 
 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
 {
-        struct usb_mixer_elem_info *info;
+        struct usb_mixer_elem_list *list;
 
-        for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
+        for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem)
                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               info->elem_id);
+                               &list->kctl->id);
 }
 
 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
-                                    int unitid,
-                                    struct usb_mixer_elem_info *cval)
+                                    struct usb_mixer_elem_list *list)
 {
+        struct usb_mixer_elem_info *cval = (struct usb_mixer_elem_info *)list;
         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
                                     "S8", "U8", "S16", "U16"};
-        snd_iprintf(buffer, "  Unit: %i\n", unitid);
-        if (cval->elem_id)
-                snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
-                                cval->elem_id->name, cval->elem_id->index);
         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
-                            "channels=%i, type=\"%s\"\n", cval->id,
+                            "channels=%i, type=\"%s\"\n", cval->head.id,
                             cval->control, cval->cmask, cval->channels,
                             val_types[cval->val_type]);
         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
@@ -2267,7 +2256,7 @@ static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
 {
         struct snd_usb_audio *chip = entry->private_data;
         struct usb_mixer_interface *mixer;
-        struct usb_mixer_elem_info *cval;
+        struct usb_mixer_elem_list *list;
         int unitid;
 
         list_for_each_entry(mixer, &chip->mixer_list, list) {
@@ -2277,9 +2266,17 @@ static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
                                 mixer->ignore_ctl_error);
                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
-                        for (cval = mixer->id_elems[unitid]; cval;
-                                                cval = cval->next_id_elem)
-                                snd_usb_mixer_dump_cval(buffer, unitid, cval);
+                        for (list = mixer->id_elems[unitid]; list;
+                             list = list->next_id_elem) {
+                                snd_iprintf(buffer, "  Unit: %i\n", list->id);
+                                if (list->kctl)
+                                        snd_iprintf(buffer,
+                                                    "    Control: name=\"%s\", index=%i\n",
+                                                    list->kctl->id.name,
+                                                    list->kctl->id.index);
+                                if (list->dump)
+                                        list->dump(buffer, list);
+                        }
                 }
         }
 }
@@ -2287,7 +2284,7 @@ static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
                                        int attribute, int value, int index)
 {
-        struct usb_mixer_elem_info *info;
+        struct usb_mixer_elem_list *list;
         __u8 unitid = (index >> 8) & 0xff;
         __u8 control = (value >> 8) & 0xff;
         __u8 channel = value & 0xff;
@@ -2299,7 +2296,13 @@ static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
                 return;
         }
 
-        for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
+        for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem) {
+                struct usb_mixer_elem_info *info;
+
+                if (!list->kctl)
+                        continue;
+
+                info = (struct usb_mixer_elem_info *)list;
                 if (info->control != control)
                         continue;
 
@@ -2312,7 +2315,7 @@ static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
                                 info->cached = 0;
 
                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                                        info->elem_id);
+                                       &info->head.kctl->id);
                         break;
 
                 case UAC2_CS_RANGE:
@@ -2510,8 +2513,9 @@ int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
         return 0;
 }
 
-static int restore_mixer_value(struct usb_mixer_elem_info *cval)
+static int restore_mixer_value(struct usb_mixer_elem_list *list)
 {
+        struct usb_mixer_elem_info *cval = (struct usb_mixer_elem_info *)list;
         int c, err, idx;
 
         if (cval->cmask) {
@@ -2541,19 +2545,19 @@ static int restore_mixer_value(struct usb_mixer_elem_info *cval)
 
 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
 {
-        struct usb_mixer_elem_info *cval;
+        struct usb_mixer_elem_list *list;
         int id, err;
 
-        /* FIXME: any mixer quirks? */
-
         if (reset_resume) {
                 /* restore cached mixer values */
                 for (id = 0; id < MAX_ID_ELEMS; id++) {
-                        for (cval = mixer->id_elems[id]; cval;
-                             cval = cval->next_id_elem) {
-                                err = restore_mixer_value(cval);
-                                if (err < 0)
-                                        return err;
+                        for (list = mixer->id_elems[id]; list;
+                             list = list->next_id_elem) {
+                                if (list->resume) {
+                                        err = list->resume(list);
+                                        if (err < 0)
+                                                return err;
+                                }
                         }
                 }
         }
@@ -2561,3 +2565,15 @@ int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
         return snd_usb_mixer_activate(mixer);
 }
 #endif
+
+void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
+                                 struct usb_mixer_interface *mixer,
+                                 int unitid)
+{
+        list->mixer = mixer;
+        list->id = unitid;
+        list->dump = snd_usb_mixer_dump_cval;
+#ifdef CONFIG_PM
+        list->resume = restore_mixer_value;
+#endif
+}
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index 2478a844a322..0fe87b7c7f00 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -1,6 +1,8 @@
 #ifndef __USBMIXER_H
 #define __USBMIXER_H
 
+#include <sound/info.h>
+
 struct usb_mixer_interface {
         struct snd_usb_audio *chip;
         struct usb_host_interface *hostif;
@@ -8,7 +10,7 @@ struct usb_mixer_interface {
         unsigned int ignore_ctl_error;
         struct urb *urb;
         /* array[MAX_ID_ELEMS], indexed by unit id */
-        struct usb_mixer_elem_info **id_elems;
+        struct usb_mixer_elem_list **id_elems;
 
         /* the usb audio specification version this interface complies to */
         int protocol;
@@ -36,11 +38,21 @@ enum {
         USB_MIXER_U16,
 };
 
-struct usb_mixer_elem_info {
+typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,
+                                         struct usb_mixer_elem_list *list);
+typedef int (*usb_mixer_elem_resume_func_t)(struct usb_mixer_elem_list *elem);
+
+struct usb_mixer_elem_list {
         struct usb_mixer_interface *mixer;
-        struct usb_mixer_elem_info *next_id_elem; /* list of controls with same id */
-        struct snd_ctl_elem_id *elem_id;
+        struct usb_mixer_elem_list *next_id_elem; /* list of controls with same id */
+        struct snd_kcontrol *kctl;
         unsigned int id;
+        usb_mixer_elem_dump_func_t dump;
+        usb_mixer_elem_resume_func_t resume;
+};
+
+struct usb_mixer_elem_info {
+        struct usb_mixer_elem_list head;
         unsigned int control;   /* CS or ICN (high byte) */
         unsigned int cmask; /* channel mask bitmap: 0 = master */
         unsigned int idx_off; /* Control index offset */
@@ -65,9 +77,13 @@ void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
                                 int request, int validx, int value_set);
 
-int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
+int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
                               struct snd_kcontrol *kctl);
 
+void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
+                                 struct usb_mixer_interface *mixer,
+                                 int unitid);
+
 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
                           unsigned int size, unsigned int __user *_tlv);
 
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 8b55c0667f60..88a408cdddbd 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -69,7 +69,6 @@ static int snd_create_std_mono_ctl_offset(struct usb_mixer_interface *mixer,
                                 const char *name,
                                 snd_kcontrol_tlv_rw_t *tlv_callback)
 {
-        int err;
         struct usb_mixer_elem_info *cval;
         struct snd_kcontrol *kctl;
 
@@ -77,8 +76,7 @@ static int snd_create_std_mono_ctl_offset(struct usb_mixer_interface *mixer,
         if (!cval)
                 return -ENOMEM;
 
-        cval->id = unitid;
-        cval->mixer = mixer;
+        snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
         cval->val_type = val_type;
         cval->channels = 1;
         cval->control = control;
@@ -112,11 +110,7 @@ static int snd_create_std_mono_ctl_offset(struct usb_mixer_interface *mixer,
                         SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
         }
         /* Add control to mixer */
-        err = snd_usb_mixer_add_control(mixer, kctl);
-        if (err < 0)
-                return err;
-
-        return 0;
+        return snd_usb_mixer_add_control(&cval->head, kctl);
 }
 
 static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer,
@@ -1206,7 +1200,7 @@ void snd_emuusb_set_samplerate(struct snd_usb_audio *chip,
         int unitid = 12; /* SamleRate ExtensionUnit ID */
 
         list_for_each_entry(mixer, &chip->mixer_list, list) {
-                cval = mixer->id_elems[unitid];
+                cval = (struct usb_mixer_elem_info *)mixer->id_elems[unitid];
                 if (cval) {
                         snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR,
                                                     cval->control << 8,
diff --git a/sound/usb/mixer_scarlett.c b/sound/usb/mixer_scarlett.c
index a0a874507de5..92dba35660b3 100644
--- a/sound/usb/mixer_scarlett.c
+++ b/sound/usb/mixer_scarlett.c
@@ -436,10 +436,10 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
                                   struct snd_ctl_elem_value *ucontrol)
 {
         struct usb_mixer_elem_info *elem = kctl->private_data;
-        struct snd_usb_audio *chip = elem->mixer->chip;
+        struct snd_usb_audio *chip = elem->head.mixer->chip;
         unsigned char buf[2 * MAX_CHANNELS] = {0, };
         int wValue = (elem->control << 8) | elem->idx_off;
-        int idx = snd_usb_ctrl_intf(chip) | (elem->id << 8);
+        int idx = snd_usb_ctrl_intf(chip) | (elem->head.id << 8);
         int err;
 
         err = snd_usb_ctl_msg(chip->dev,
@@ -528,10 +528,10 @@ static int add_new_ctl(struct usb_mixer_interface *mixer,
         if (!elem)
                 return -ENOMEM;
 
-        elem->mixer = mixer;
+        elem->head.mixer = mixer;
         elem->control = offset;
         elem->idx_off = num;
-        elem->id = index;
+        elem->head.id = index;
         elem->val_type = val_type;
 
         elem->channels = channels;