--- a/sound/usb/card.c

+++ b/sound/usb/card.c

@@ -47,6 +47,7 @@

#include <linux/mutex.h>

#include <linux/usb/audio.h>

#include <linux/usb/audio-v2.h>

+#include <linux/switch.h>

#include <sound/control.h>

#include <sound/core.h>

@@ -85,6 +86,7 @@ static int nrpacks = 8; /* max. number

static int async_unlink = 1;

static int device_setup[SNDRV_CARDS]; /* device parameter for this card */

static int ignore_ctl_error;

+struct switch_dev *usbaudiosdev;

module_param_array(index, int, NULL, 0444);

MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");

@@ -418,6 +420,7 @@ static int snd_usb_audio_create(struct u

}

snd_usb_audio_create_proc(chip);

+ switch_set_state(usbaudiosdev, 1);

*rchip = chip;

return 0;

@@ -580,6 +583,7 @@ static void snd_usb_audio_disconnect(str

mutex_unlock(&chip->shutdown_mutex);

mutex_unlock(&register_mutex);

}

+ switch_set_state(usbaudiosdev, 0);

}

/*

@@ -712,16 +716,26 @@ static struct usb_driver usb_audio_drive

static int __init snd_usb_audio_init(void)

{

+ int err;

if (nrpacks < 1 || nrpacks > MAX_PACKS) {

printk(KERN_WARNING "invalid nrpacks value.\n");

return -EINVAL;

}

+

+ usbaudiosdev = kzalloc(sizeof(usbaudiosdev), GFP_KERNEL);

+ usbaudiosdev->name = "usb_audio";

+ err = switch_dev_register(usbaudiosdev);

+ if (err)

+ pr_err("Usb-audio switch registration failed\n");

+ else

+ pr_debug("usb hs_detected\n");

return usb_register(&usb_audio_driver);

}

static void __exit snd_usb_audio_cleanup(void)

{

usb_deregister(&usb_audio_driver);

+ kfree(usbaudiosdev);

}

module_init(snd_usb_audio_init);