initial_commit

1 files changed, 803 insertions, 0 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
new file mode 100644
index 00000000..1a112d3c
--- /dev/null
+++ b/sound/usb/card.c
@@ -0,0 +1,803 @@
+/*
+ *   (Tentative) USB Audio Driver for ALSA
+ *
+ *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
+ *   Copyright (C) 2012 Freescale Semiconductor, Inc.
+ *
+ *   Many codes borrowed from audio.c by
+ *	    Alan Cox (alan@lxorguk.ukuu.org.uk)
+ *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ *
+ *  NOTES:
+ *
+ *   - async unlink should be used for avoiding the sleep inside lock.
+ *     2.4.22 usb-uhci seems buggy for async unlinking and results in
+ *     oops.  in such a cse, pass async_unlink=0 option.
+ *   - the linked URBs would be preferred but not used so far because of
+ *     the instability of unlinking.
+ *   - type II is not supported properly.  there is no device which supports
+ *     this type *correctly*.  SB extigy looks as if it supports, but it's
+ *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
+ */
+
+
+#include <linux/bitops.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/usb.h>
+#include <linux/moduleparam.h>
+#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>
+#include <sound/info.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+
+#include "usbaudio.h"
+#include "card.h"
+#include "midi.h"
+#include "mixer.h"
+#include "proc.h"
+#include "quirks.h"
+#include "endpoint.h"
+#include "helper.h"
+#include "debug.h"
+#include "pcm.h"
+#include "urb.h"
+#include "format.h"
+#include "power.h"
+
+MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
+MODULE_DESCRIPTION("USB Audio");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
+
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
+/* Vendor/product IDs for this card */
+static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
+static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
+static int nrpacks = 8;		/* max. number of packets per urb */
+static int async_unlink = 1;
+static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
+static int ignore_ctl_error;
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
+module_param_array(vid, int, NULL, 0444);
+MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
+module_param_array(pid, int, NULL, 0444);
+MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
+module_param(nrpacks, int, 0644);
+MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
+module_param(async_unlink, bool, 0444);
+MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
+module_param_array(device_setup, int, NULL, 0444);
+MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
+module_param(ignore_ctl_error, bool, 0444);
+MODULE_PARM_DESC(ignore_ctl_error,
+		 "Ignore errors from USB controller for mixer interfaces.");
+
+/*
+ * we keep the snd_usb_audio_t instances by ourselves for merging
+ * the all interfaces on the same card as one sound device.
+ */
+
+struct usb_audio_switch_data {
+	struct switch_dev sdev;
+	const char *name_on;
+	const char *name_off;
+	const char *state_on;
+	const char *state_off;
+};
+
+static struct usb_audio_switch_data *audio_switch_data[SNDRV_CARDS];
+static DEFINE_MUTEX(register_mutex);
+static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
+static struct usb_driver usb_audio_driver;
+
+/*
+ * disconnect streams
+ * called from snd_usb_audio_disconnect()
+ */
+static void snd_usb_stream_disconnect(struct list_head *head)
+{
+	int idx;
+	struct snd_usb_stream *as;
+	struct snd_usb_substream *subs;
+
+	as = list_entry(head, struct snd_usb_stream, list);
+	for (idx = 0; idx < 2; idx++) {
+		subs = &as->substream[idx];
+		if (!subs->num_formats)
+			continue;
+		snd_usb_release_substream_urbs(subs, 1);
+		subs->interface = -1;
+	}
+}
+
+static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
+{
+	struct usb_device *dev = chip->dev;
+	struct usb_host_interface *alts;
+	struct usb_interface_descriptor *altsd;
+	struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
+
+	if (!iface) {
+		snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
+			   dev->devnum, ctrlif, interface);
+		return -EINVAL;
+	}
+
+	if (usb_interface_claimed(iface)) {
+		snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
+						dev->devnum, ctrlif, interface);
+		return -EINVAL;
+	}
+
+	alts = &iface->altsetting[0];
+	altsd = get_iface_desc(alts);
+	if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
+	     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
+	    altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
+		int err = snd_usbmidi_create(chip->card, iface,
+					     &chip->midi_list, NULL);
+		if (err < 0) {
+			snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
+						dev->devnum, ctrlif, interface);
+			return -EINVAL;
+		}
+		usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
+
+		return 0;
+	}
+
+	if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
+	     altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
+	    altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
+		snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
+					dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
+		/* skip non-supported classes */
+		return -EINVAL;
+	}
+
+	if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
+		snd_printk(KERN_ERR "low speed audio streaming not supported\n");
+		return -EINVAL;
+	}
+
+	if (! snd_usb_parse_audio_endpoints(chip, interface)) {
+		usb_set_interface(dev, interface, 0); /* reset the current interface */
+		usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * parse audio control descriptor and create pcm/midi streams
+ */
+static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
+{
+	struct usb_device *dev = chip->dev;
+	struct usb_host_interface *host_iface;
+	struct usb_interface_descriptor *altsd;
+	void *control_header;
+	int i, protocol;
+
+	/* find audiocontrol interface */
+	host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
+	control_header = snd_usb_find_csint_desc(host_iface->extra,
+						 host_iface->extralen,
+						 NULL, UAC_HEADER);
+	altsd = get_iface_desc(host_iface);
+	protocol = altsd->bInterfaceProtocol;
+
+	if (!control_header) {
+		snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
+		return -EINVAL;
+	}
+
+	switch (protocol) {
+	default:
+		snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
+			    protocol);
+		/* fall through */
+
+	case UAC_VERSION_1: {
+		struct uac1_ac_header_descriptor *h1 = control_header;
+
+		if (!h1->bInCollection) {
+			snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
+			return -EINVAL;
+		}
+
+		if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
+			snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
+			return -EINVAL;
+		}
+
+		for (i = 0; i < h1->bInCollection; i++)
+			snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
+
+		break;
+	}
+
+	case UAC_VERSION_2: {
+		struct usb_interface_assoc_descriptor *assoc =
+			usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
+
+		if (!assoc) {
+			snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
+			return -EINVAL;
+		}
+
+		for (i = 0; i < assoc->bInterfaceCount; i++) {
+			int intf = assoc->bFirstInterface + i;
+
+			if (intf != ctrlif)
+				snd_usb_create_stream(chip, ctrlif, intf);
+		}
+
+		break;
+	}
+	}
+
+	return 0;
+}
+
+/*
+ * free the chip instance
+ *
+ * here we have to do not much, since pcm and controls are already freed
+ *
+ */
+
+static int snd_usb_audio_free(struct snd_usb_audio *chip)
+{
+	kfree(chip);
+	return 0;
+}
+
+static int snd_usb_audio_dev_free(struct snd_device *device)
+{
+	struct snd_usb_audio *chip = device->device_data;
+	return snd_usb_audio_free(chip);
+}
+
+static void remove_trailing_spaces(char *str)
+{
+	char *p;
+
+	if (!*str)
+		return;
+	for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
+		*p = 0;
+}
+
+/*
+ * create a chip instance and set its names.
+ */
+static int snd_usb_audio_create(struct usb_device *dev, int idx,
+				const struct snd_usb_audio_quirk *quirk,
+				struct snd_usb_audio **rchip)
+{
+	struct snd_card *card;
+	struct snd_usb_audio *chip;
+	int err, len;
+	char component[14];
+	static struct snd_device_ops ops = {
+		.dev_free =	snd_usb_audio_dev_free,
+	};
+
+	*rchip = NULL;
+
+	switch (snd_usb_get_speed(dev)) {
+	case USB_SPEED_LOW:
+	case USB_SPEED_FULL:
+	case USB_SPEED_HIGH:
+	case USB_SPEED_SUPER:
+		break;
+	default:
+		snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
+		return -ENXIO;
+	}
+
+	err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
+	if (err < 0) {
+		snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
+		return err;
+	}
+
+	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+	if (! chip) {
+		snd_card_free(card);
+		return -ENOMEM;
+	}
+
+	mutex_init(&chip->shutdown_mutex);
+	chip->index = idx;
+	chip->dev = dev;
+	chip->card = card;
+	chip->setup = device_setup[idx];
+	chip->nrpacks = nrpacks;
+	chip->async_unlink = async_unlink;
+	chip->probing = 1;
+
+	chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
+			      le16_to_cpu(dev->descriptor.idProduct));
+	INIT_LIST_HEAD(&chip->pcm_list);
+	INIT_LIST_HEAD(&chip->midi_list);
+	INIT_LIST_HEAD(&chip->mixer_list);
+
+	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
+		snd_usb_audio_free(chip);
+		snd_card_free(card);
+		return err;
+	}
+
+	strcpy(card->driver, "USB-Audio");
+	sprintf(component, "USB%04x:%04x",
+		USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
+	snd_component_add(card, component);
+
+	/* retrieve the device string as shortname */
+	if (quirk && quirk->product_name && *quirk->product_name) {
+		strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
+	} else {
+		if (!dev->descriptor.iProduct ||
+		    usb_string(dev, dev->descriptor.iProduct,
+		    card->shortname, sizeof(card->shortname)) <= 0) {
+			/* no name available from anywhere, so use ID */
+			sprintf(card->shortname, "USB Device %#04x:%#04x",
+				USB_ID_VENDOR(chip->usb_id),
+				USB_ID_PRODUCT(chip->usb_id));
+		}
+	}
+	remove_trailing_spaces(card->shortname);
+
+	/* retrieve the vendor and device strings as longname */
+	if (quirk && quirk->vendor_name && *quirk->vendor_name) {
+		len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
+	} else {
+		if (dev->descriptor.iManufacturer)
+			len = usb_string(dev, dev->descriptor.iManufacturer,
+					 card->longname, sizeof(card->longname));
+		else
+			len = 0;
+		/* we don't really care if there isn't any vendor string */
+	}
+	if (len > 0) {
+		remove_trailing_spaces(card->longname);
+		if (*card->longname)
+			strlcat(card->longname, " ", sizeof(card->longname));
+	}
+
+	strlcat(card->longname, card->shortname, sizeof(card->longname));
+
+	len = strlcat(card->longname, " at ", sizeof(card->longname));
+
+	if (len < sizeof(card->longname))
+		usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
+
+	switch (snd_usb_get_speed(dev)) {
+	case USB_SPEED_LOW:
+		strlcat(card->longname, ", low speed", sizeof(card->longname));
+		break;
+	case USB_SPEED_FULL:
+		strlcat(card->longname, ", full speed", sizeof(card->longname));
+		break;
+	case USB_SPEED_HIGH:
+		strlcat(card->longname, ", high speed", sizeof(card->longname));
+		break;
+	case USB_SPEED_SUPER:
+		strlcat(card->longname, ", super speed", sizeof(card->longname));
+		break;
+	default:
+		break;
+	}
+
+	snd_usb_audio_create_proc(chip);
+
+	*rchip = chip;
+	return 0;
+}
+
+/*
+ * probe the active usb device
+ *
+ * note that this can be called multiple times per a device, when it
+ * includes multiple audio control interfaces.
+ *
+ * thus we check the usb device pointer and creates the card instance
+ * only at the first time.  the successive calls of this function will
+ * append the pcm interface to the corresponding card.
+ */
+static void *snd_usb_audio_probe(struct usb_device *dev,
+				 struct usb_interface *intf,
+				 const struct usb_device_id *usb_id)
+{
+	const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
+	int i, err;
+	struct snd_usb_audio *chip;
+	struct usb_host_interface *alts;
+	int ifnum;
+	u32 id;
+
+	alts = &intf->altsetting[0];
+	ifnum = get_iface_desc(alts)->bInterfaceNumber;
+	id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
+		    le16_to_cpu(dev->descriptor.idProduct));
+	if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
+		goto __err_val;
+
+	if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
+		goto __err_val;
+
+	/*
+	 * found a config.  now register to ALSA
+	 */
+
+	/* check whether it's already registered */
+	chip = NULL;
+	mutex_lock(&register_mutex);
+	for (i = 0; i < SNDRV_CARDS; i++) {
+		if (usb_chip[i] && usb_chip[i]->dev == dev) {
+			if (usb_chip[i]->shutdown) {
+				snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
+				goto __error;
+			}
+			chip = usb_chip[i];
+			chip->probing = 1;
+			break;
+		}
+	}
+	if (! chip) {
+		/* it's a fresh one.
+		 * now look for an empty slot and create a new card instance
+		 */
+		for (i = 0; i < SNDRV_CARDS; i++)
+			if (enable[i] && ! usb_chip[i] &&
+			    (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
+			    (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
+				if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
+					goto __error;
+				}
+				snd_card_set_dev(chip->card, &intf->dev);
+				chip->pm_intf = intf;
+				break;
+			}
+		if (!chip) {
+			printk(KERN_ERR "no available usb audio device\n");
+			goto __error;
+		}
+	}
+
+	/*
+	 * For devices with more than one control interface, we assume the
+	 * first contains the audio controls. We might need a more specific
+	 * check here in the future.
+	 */
+	if (!chip->ctrl_intf)
+		chip->ctrl_intf = alts;
+
+	chip->txfr_quirk = 0;
+	err = 1; /* continue */
+	if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
+		/* need some special handlings */
+		if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
+			goto __error;
+	}
+
+	if (err > 0) {
+		/* create normal USB audio interfaces */
+		if (snd_usb_create_streams(chip, ifnum) < 0 ||
+		    snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
+			goto __error;
+		}
+	}
+
+	/* we are allowed to call snd_card_register() many times */
+	if (snd_card_register(chip->card) < 0) {
+		goto __error;
+	}
+
+	usb_chip[chip->index] = chip;
+	chip->num_interfaces++;
+	chip->probing = 0;
+	mutex_unlock(&register_mutex);
+	return chip;
+
+ __error:
+	if (chip) {
+		if (!chip->num_interfaces)
+			snd_card_free(chip->card);
+		chip->probing = 0;
+	}
+	mutex_unlock(&register_mutex);
+ __err_val:
+	return NULL;
+}
+
+/*
+ * we need to take care of counter, since disconnection can be called also
+ * many times as well as usb_audio_probe().
+ */
+static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
+{
+	struct snd_usb_audio *chip;
+	struct snd_card *card;
+	struct list_head *p;
+
+	if (ptr == (void *)-1L)
+		return;
+
+	chip = ptr;
+	card = chip->card;
+	mutex_lock(&register_mutex);
+	mutex_lock(&chip->shutdown_mutex);
+	chip->shutdown = 1;
+	chip->num_interfaces--;
+	if (chip->num_interfaces <= 0) {
+		snd_card_disconnect(card);
+		/* release the pcm resources */
+		list_for_each(p, &chip->pcm_list) {
+			snd_usb_stream_disconnect(p);
+		}
+		/* release the midi resources */
+		list_for_each(p, &chip->midi_list) {
+			snd_usbmidi_disconnect(p);
+		}
+		/* release mixer resources */
+		list_for_each(p, &chip->mixer_list) {
+			snd_usb_mixer_disconnect(p);
+		}
+		usb_chip[chip->index] = NULL;
+		mutex_unlock(&chip->shutdown_mutex);
+		mutex_unlock(&register_mutex);
+		snd_card_free_when_closed(card);
+	} else {
+		mutex_unlock(&chip->shutdown_mutex);
+		mutex_unlock(&register_mutex);
+	}
+}
+
+/*
+ * new 2.5 USB kernel API
+ */
+static int usb_audio_probe(struct usb_interface *intf,
+			   const struct usb_device_id *id)
+{
+	void *chip;
+	struct usb_audio_switch_data *switch_data;
+	int ret = 0;
+	struct snd_usb_audio *uchip;
+	int idx;
+	struct snd_usb_stream *as;
+	struct snd_usb_substream *subs;
+	struct list_head *head;
+	int state = 0;
+
+	chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
+	if (chip) {
+		usb_set_intfdata(intf, chip);
+		uchip = chip;
+		switch_data = kzalloc(sizeof(struct usb_audio_switch_data), GFP_KERNEL);
+		if (!switch_data)
+			return -ENOMEM;
+		switch_data->sdev.name = "usb_audio";
+		ret = switch_dev_register(&switch_data->sdev);
+		if (ret < 0)
+			goto err_switch_dev_register;
+		audio_switch_data[uchip->index] = switch_data;
+
+		list_for_each(head, &uchip->pcm_list) {
+			as = list_entry(head, struct snd_usb_stream, list);
+			for (idx = 0; idx < 2; idx++) {
+				subs = &as->substream[idx];
+				if (!subs->num_formats)
+					continue;
+				if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
+					state |= 0x1;
+				if (subs->direction == SNDRV_PCM_STREAM_CAPTURE)
+					state |= 0x2;
+			}
+		}
+		switch_set_state(&switch_data->sdev, state);
+		return 0;
+	} else
+		return -EIO;
+
+
+err_switch_dev_register:
+	kfree(switch_data);
+	return 0;
+}
+
+static void usb_audio_disconnect(struct usb_interface *intf)
+{
+	struct snd_usb_audio *uchip = usb_get_intfdata(intf);
+	struct usb_audio_switch_data *switch_data;
+	int idx;
+	struct snd_usb_stream *as;
+	struct snd_usb_substream *subs;
+	struct list_head *head;
+
+	if (uchip == (void *)-1L)
+		return;
+
+	if (uchip) {
+		switch_data = audio_switch_data[uchip->index];
+		if (switch_data) {
+			switch_set_state(&switch_data->sdev, 0);
+			switch_dev_unregister(&switch_data->sdev);
+			kfree(switch_data);
+		}
+		list_for_each(head, &uchip->pcm_list) {
+			as = list_entry(head, struct snd_usb_stream, list);
+			for (idx = 0; idx < 2; idx++) {
+				subs = &as->substream[idx];
+				if (subs->running)
+				    snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_DISCONNECTED);
+			}
+		}
+	}
+
+	snd_usb_audio_disconnect(interface_to_usbdev(intf),
+				 usb_get_intfdata(intf));
+}
+
+#ifdef CONFIG_PM
+
+int snd_usb_autoresume(struct snd_usb_audio *chip)
+{
+	int err = -ENODEV;
+
+	if (!chip->shutdown && !chip->probing)
+		err = usb_autopm_get_interface(chip->pm_intf);
+
+	return err;
+}
+
+void snd_usb_autosuspend(struct snd_usb_audio *chip)
+{
+	if (!chip->shutdown && !chip->probing)
+		usb_autopm_put_interface(chip->pm_intf);
+}
+
+static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct snd_usb_audio *chip = usb_get_intfdata(intf);
+	struct list_head *p;
+	struct snd_usb_stream *as;
+	struct usb_mixer_interface *mixer;
+
+	if (chip == (void *)-1L)
+		return 0;
+
+	if (!(message.event & PM_EVENT_AUTO)) {
+		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
+		if (!chip->num_suspended_intf++) {
+			list_for_each(p, &chip->pcm_list) {
+				as = list_entry(p, struct snd_usb_stream, list);
+				snd_pcm_suspend_all(as->pcm);
+			}
+ 		}
+	} else {
+		/*
+		 * otherwise we keep the rest of the system in the dark
+		 * to keep this transparent
+		 */
+		if (!chip->num_suspended_intf++)
+			chip->autosuspended = 1;
+	}
+
+	list_for_each_entry(mixer, &chip->mixer_list, list)
+		snd_usb_mixer_inactivate(mixer);
+
+	return 0;
+}
+
+static int usb_audio_resume(struct usb_interface *intf)
+{
+	struct snd_usb_audio *chip = usb_get_intfdata(intf);
+	struct usb_mixer_interface *mixer;
+	int err = 0;
+
+	if (chip == (void *)-1L)
+		return 0;
+	if (--chip->num_suspended_intf)
+		return 0;
+	/*
+	 * ALSA leaves material resumption to user space
+	 * we just notify and restart the mixers
+	 */
+	list_for_each_entry(mixer, &chip->mixer_list, list) {
+		err = snd_usb_mixer_activate(mixer);
+		if (err < 0)
+			goto err_out;
+	}
+
+	if (!chip->autosuspended)
+		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
+	chip->autosuspended = 0;
+
+err_out:
+	return err;
+}
+#else
+#define usb_audio_suspend	NULL
+#define usb_audio_resume	NULL
+#endif		/* CONFIG_PM */
+
+static struct usb_device_id usb_audio_ids [] = {
+#include "quirks-table.h"
+    { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
+      .bInterfaceClass = USB_CLASS_AUDIO,
+      .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
+    { }						/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, usb_audio_ids);
+
+/*
+ * entry point for linux usb interface
+ */
+
+static struct usb_driver usb_audio_driver = {
+	.name =		"snd-usb-audio",
+	.probe =	usb_audio_probe,
+	.disconnect =	usb_audio_disconnect,
+	.suspend =	usb_audio_suspend,
+	.resume =	usb_audio_resume,
+	.id_table =	usb_audio_ids,
+	.supports_autosuspend = 1,
+};
+
+static int __init snd_usb_audio_init(void)
+{
+	if (nrpacks < 1 || nrpacks > MAX_PACKS) {
+		printk(KERN_WARNING "invalid nrpacks value.\n");
+		return -EINVAL;
+	}
+	return usb_register(&usb_audio_driver);
+}
+
+static void __exit snd_usb_audio_cleanup(void)
+{
+	usb_deregister(&usb_audio_driver);
+}
+
+module_init(snd_usb_audio_init);
+module_exit(snd_usb_audio_cleanup);