diff --git a/sound/usb/card.c b/sound/usb/card.c
index 3769622..ac81c5f 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -117,6 +117,118 @@ MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no)
 static DEFINE_MUTEX(register_mutex);
 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 static struct usb_driver usb_audio_driver;
+static struct snd_usb_audio_vendor_ops *usb_vendor_ops;
+
+int snd_vendor_set_ops(struct snd_usb_audio_vendor_ops *ops)
+{
+	if ((!ops->connect) ||
+	    (!ops->disconnect) ||
+	    (!ops->set_interface) ||
+	    (!ops->set_rate) ||
+	    (!ops->set_pcm_buf) ||
+	    (!ops->set_pcm_intf) ||
+	    (!ops->set_pcm_connection) ||
+	    (!ops->set_pcm_binterval) ||
+	    (!ops->usb_add_ctls))
+		return -EINVAL;
+
+	usb_vendor_ops = ops;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_vendor_set_ops);
+
+struct snd_usb_audio_vendor_ops *snd_vendor_get_ops(void)
+{
+	return usb_vendor_ops;
+}
+
+static int snd_vendor_connect(struct usb_interface *intf)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->connect(intf);
+	return 0;
+}
+
+static void snd_vendor_disconnect(struct usb_interface *intf)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		ops->disconnect(intf);
+}
+
+int snd_vendor_set_interface(struct usb_device *udev,
+			     struct usb_host_interface *intf,
+			     int iface, int alt)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->set_interface(udev, intf, iface, alt);
+	return 0;
+}
+
+int snd_vendor_set_rate(struct usb_interface *intf, int iface, int rate,
+			int alt)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->set_rate(intf, iface, rate, alt);
+	return 0;
+}
+
+int snd_vendor_set_pcm_buf(struct usb_device *udev, int iface)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		ops->set_pcm_buf(udev, iface);
+	return 0;
+}
+
+int snd_vendor_set_pcm_intf(struct usb_interface *intf, int iface, int alt,
+			    int direction)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->set_pcm_intf(intf, iface, alt, direction);
+	return 0;
+}
+
+int snd_vendor_set_pcm_connection(struct usb_device *udev,
+				  enum snd_vendor_pcm_open_close onoff,
+				  int direction)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->set_pcm_connection(udev, onoff, direction);
+	return 0;
+}
+
+int snd_vendor_set_pcm_binterval(const struct audioformat *fp,
+				 const struct audioformat *found,
+				 int *cur_attr, int *attr)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->set_pcm_binterval(fp, found, cur_attr, attr);
+	return 0;
+}
+
+static int snd_vendor_usb_add_ctls(struct snd_usb_audio *chip)
+{
+	struct snd_usb_audio_vendor_ops *ops = snd_vendor_get_ops();
+
+	if (ops)
+		return ops->usb_add_ctls(chip);
+	return 0;
+}
 
 /*
  * disconnect streams
@@ -753,6 +865,10 @@ static int usb_audio_probe(struct usb_interface *intf,
 	if (err < 0)
 		return err;
 
+	err = snd_vendor_connect(intf);
+	if (err)
+		return err;
+
 	/*
 	 * found a config.  now register to ALSA
 	 */
@@ -820,6 +936,8 @@ static int usb_audio_probe(struct usb_interface *intf,
 	if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
 		usb_disable_autosuspend(interface_to_usbdev(intf));
 
+	snd_vendor_usb_add_ctls(chip);
+
 	/*
 	 * For devices with more than one control interface, we assume the
 	 * first contains the audio controls. We might need a more specific
@@ -907,6 +1025,8 @@ static void usb_audio_disconnect(struct usb_interface *intf)
 
 	card = chip->card;
 
+	snd_vendor_disconnect(intf);
+
 	mutex_lock(&register_mutex);
 	if (atomic_inc_return(&chip->shutdown) == 1) {
 		struct snd_usb_stream *as;
diff --git a/sound/usb/card.h b/sound/usb/card.h
index 87f042d..2b686e4 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -204,4 +204,25 @@ struct snd_usb_stream {
 	struct list_head list;
 };
 
+struct snd_usb_substream *find_snd_usb_substream(unsigned int card_num,
+	unsigned int pcm_idx, unsigned int direction, struct snd_usb_audio
+	**uchip, void (*disconnect_cb)(struct snd_usb_audio *chip));
+
+int snd_vendor_set_ops(struct snd_usb_audio_vendor_ops *vendor_ops);
+struct snd_usb_audio_vendor_ops *snd_vendor_get_ops(void);
+int snd_vendor_set_interface(struct usb_device *udev,
+			     struct usb_host_interface *alts,
+			     int iface, int alt);
+int snd_vendor_set_rate(struct usb_interface *intf, int iface, int rate,
+			int alt);
+int snd_vendor_set_pcm_buf(struct usb_device *udev, int iface);
+int snd_vendor_set_pcm_intf(struct usb_interface *intf, int iface, int alt,
+			    int direction);
+int snd_vendor_set_pcm_connection(struct usb_device *udev,
+				  enum snd_vendor_pcm_open_close onoff,
+				  int direction);
+int snd_vendor_set_pcm_binterval(const struct audioformat *fp,
+				 const struct audioformat *found,
+				 int *cur_attr, int *attr);
+
 #endif /* __USBAUDIO_CARD_H */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 1678341..edcb5a3 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -184,4 +184,50 @@ extern bool snd_usb_skip_validation;
 #define QUIRK_FLAG_DSD_RAW		(1U << 15)
 #define QUIRK_FLAG_SET_IFACE_FIRST	(1U << 16)
 
+struct audioformat;
+
+enum snd_vendor_pcm_open_close {
+	SOUND_PCM_CLOSE = 0,
+	SOUND_PCM_OPEN,
+};
+
+/**
+ * struct snd_usb_audio_vendor_ops - function callbacks for USB audio accelerators
+ * @connect: called when a new interface is found
+ * @disconnect: called when an interface is removed
+ * @set_interface: called when an interface is initialized
+ * @set_rate: called when the rate is set
+ * @set_pcm_buf: called when the pcm buffer is set
+ * @set_pcm_intf: called when the pcm interface is set
+ * @set_pcm_connection: called when pcm is opened/closed
+ * @set_pcm_binterval: called when the pcm binterval is set
+ * @usb_add_ctls: called when USB controls are added
+ *
+ * Set of callbacks for some accelerated USB audio streaming hardware.
+ *
+ * TODO: make this USB host-controller specific, right now this only works for
+ * one USB controller in the system at a time, which is only realistic for
+ * self-contained systems like phones.
+ */
+struct snd_usb_audio_vendor_ops {
+	int (*connect)(struct usb_interface *intf);
+	void (*disconnect)(struct usb_interface *intf);
+
+	int (*set_interface)(struct usb_device *udev,
+			     struct usb_host_interface *alts,
+			     int iface, int alt);
+	int (*set_rate)(struct usb_interface *intf, int iface, int rate,
+			int alt);
+	int (*set_pcm_buf)(struct usb_device *udev, int iface);
+	int (*set_pcm_intf)(struct usb_interface *intf, int iface, int alt,
+			    int direction);
+	int (*set_pcm_connection)(struct usb_device *udev,
+				  enum snd_vendor_pcm_open_close onoff,
+				  int direction);
+	int (*set_pcm_binterval)(const struct audioformat *fp,
+				 const struct audioformat *found,
+				 int *cur_attr, int *attr);
+	int (*usb_add_ctls)(struct snd_usb_audio *chip);
+};
+
 #endif /* __USBAUDIO_H */
