Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1164 insertions, 0 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
new file mode 100644
index 000000000..26268ffb8
--- /dev/null
+++ b/sound/usb/card.c
@@ -0,0 +1,1164 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   (Tentative) USB Audio Driver for ALSA
+ *
+ *   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 Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
+ *
+ *  NOTES:
+ *
+ *   - 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/usb/audio-v3.h>
+#include <linux/module.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 "pcm.h"
+#include "format.h"
+#include "power.h"
+#include "stream.h"
+#include "media.h"
+
+MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
+MODULE_DESCRIPTION("USB Audio");
+MODULE_LICENSE("GPL");
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static bool 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 device_setup[SNDRV_CARDS]; /* device parameter for this card */
+static bool ignore_ctl_error;
+static bool autoclock = true;
+static bool lowlatency = true;
+static char *quirk_alias[SNDRV_CARDS];
+static char *delayed_register[SNDRV_CARDS];
+static bool implicit_fb[SNDRV_CARDS];
+static unsigned int quirk_flags[SNDRV_CARDS];
+
+bool snd_usb_use_vmalloc = true;
+bool snd_usb_skip_validation;
+
+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_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.");
+module_param(autoclock, bool, 0444);
+MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
+module_param(lowlatency, bool, 0444);
+MODULE_PARM_DESC(lowlatency, "Enable low latency playback (default: yes).");
+module_param_array(quirk_alias, charp, NULL, 0444);
+MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
+module_param_array(delayed_register, charp, NULL, 0444);
+MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
+module_param_array(implicit_fb, bool, NULL, 0444);
+MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
+module_param_array(quirk_flags, uint, NULL, 0444);
+MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
+module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
+MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
+module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
+MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
+
+/*
+ * we keep the snd_usb_audio_t instances by ourselves for merging
+ * the all interfaces on the same card as one sound device.
+ */
+
+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 usb_audio_disconnect()
+ */
+static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
+{
+	int idx;
+	struct snd_usb_substream *subs;
+
+	for (idx = 0; idx < 2; idx++) {
+		subs = &as->substream[idx];
+		if (!subs->num_formats)
+			continue;
+		subs->data_endpoint = NULL;
+		subs->sync_endpoint = NULL;
+	}
+}
+
+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) {
+		dev_err(&dev->dev, "%u:%d : does not exist\n",
+			ctrlif, interface);
+		return -EINVAL;
+	}
+
+	alts = &iface->altsetting[0];
+	altsd = get_iface_desc(alts);
+
+	/*
+	 * Android with both accessory and audio interfaces enabled gets the
+	 * interface numbers wrong.
+	 */
+	if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
+	     chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
+	    interface == 0 &&
+	    altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
+	    altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
+		interface = 2;
+		iface = usb_ifnum_to_if(dev, interface);
+		if (!iface)
+			return -EINVAL;
+		alts = &iface->altsetting[0];
+		altsd = get_iface_desc(alts);
+	}
+
+	if (usb_interface_claimed(iface)) {
+		dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
+			ctrlif, interface);
+		return -EINVAL;
+	}
+
+	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,
+					     chip->usb_id);
+		if (err < 0) {
+			dev_err(&dev->dev,
+				"%u:%d: cannot create sequencer device\n",
+				ctrlif, interface);
+			return -EINVAL;
+		}
+		return usb_driver_claim_interface(&usb_audio_driver, iface,
+						  USB_AUDIO_IFACE_UNUSED);
+	}
+
+	if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
+	     altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
+	    altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
+		dev_dbg(&dev->dev,
+			"%u:%d: skipping non-supported interface %d\n",
+			ctrlif, interface, altsd->bInterfaceClass);
+		/* skip non-supported classes */
+		return -EINVAL;
+	}
+
+	if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
+		dev_err(&dev->dev, "low speed audio streaming not supported\n");
+		return -EINVAL;
+	}
+
+	if (! snd_usb_parse_audio_interface(chip, interface)) {
+		usb_set_interface(dev, interface, 0); /* reset the current interface */
+		return usb_driver_claim_interface(&usb_audio_driver, iface,
+						  USB_AUDIO_IFACE_UNUSED);
+	}
+
+	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;
+	int i, protocol;
+
+	/* find audiocontrol interface */
+	host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
+	altsd = get_iface_desc(host_iface);
+	protocol = altsd->bInterfaceProtocol;
+
+	switch (protocol) {
+	default:
+		dev_warn(&dev->dev,
+			 "unknown interface protocol %#02x, assuming v1\n",
+			 protocol);
+		fallthrough;
+
+	case UAC_VERSION_1: {
+		struct uac1_ac_header_descriptor *h1;
+		int rest_bytes;
+
+		h1 = snd_usb_find_csint_desc(host_iface->extra,
+							 host_iface->extralen,
+							 NULL, UAC_HEADER);
+		if (!h1 || h1->bLength < sizeof(*h1)) {
+			dev_err(&dev->dev, "cannot find UAC_HEADER\n");
+			return -EINVAL;
+		}
+
+		rest_bytes = (void *)(host_iface->extra +
+				host_iface->extralen) - (void *)h1;
+
+		/* just to be sure -- this shouldn't hit at all */
+		if (rest_bytes <= 0) {
+			dev_err(&dev->dev, "invalid control header\n");
+			return -EINVAL;
+		}
+
+		if (rest_bytes < sizeof(*h1)) {
+			dev_err(&dev->dev, "too short v1 buffer descriptor\n");
+			return -EINVAL;
+		}
+
+		if (!h1->bInCollection) {
+			dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
+			return -EINVAL;
+		}
+
+		if (rest_bytes < h1->bLength) {
+			dev_err(&dev->dev, "invalid buffer length (v1)\n");
+			return -EINVAL;
+		}
+
+		if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
+			dev_err(&dev->dev, "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:
+	case UAC_VERSION_3: {
+		struct usb_interface_assoc_descriptor *assoc =
+			usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
+
+		if (!assoc) {
+			/*
+			 * Firmware writers cannot count to three.  So to find
+			 * the IAD on the NuForce UDH-100, also check the next
+			 * interface.
+			 */
+			struct usb_interface *iface =
+				usb_ifnum_to_if(dev, ctrlif + 1);
+			if (iface &&
+			    iface->intf_assoc &&
+			    iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
+			    iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
+				assoc = iface->intf_assoc;
+		}
+
+		if (!assoc) {
+			dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
+			return -EINVAL;
+		}
+
+		if (protocol == UAC_VERSION_3) {
+			int badd = assoc->bFunctionSubClass;
+
+			if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
+			    (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
+			     badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
+				dev_err(&dev->dev,
+					"Unsupported UAC3 BADD profile\n");
+				return -EINVAL;
+			}
+
+			chip->badd_profile = badd;
+		}
+
+		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;
+}
+
+/*
+ * Profile name preset table
+ */
+struct usb_audio_device_name {
+	u32 id;
+	const char *vendor_name;
+	const char *product_name;
+	const char *profile_name;	/* override card->longname */
+};
+
+#define PROFILE_NAME(vid, pid, vendor, product, profile)	 \
+	{ .id = USB_ID(vid, pid), .vendor_name = (vendor),	 \
+	  .product_name = (product), .profile_name = (profile) }
+#define DEVICE_NAME(vid, pid, vendor, product) \
+	PROFILE_NAME(vid, pid, vendor, product, NULL)
+
+/* vendor/product and profile name presets, sorted in device id order */
+static const struct usb_audio_device_name usb_audio_names[] = {
+	/* HP Thunderbolt Dock Audio Headset */
+	PROFILE_NAME(0x03f0, 0x0269, "HP", "Thunderbolt Dock Audio Headset",
+		     "HP-Thunderbolt-Dock-Audio-Headset"),
+	/* HP Thunderbolt Dock Audio Module */
+	PROFILE_NAME(0x03f0, 0x0567, "HP", "Thunderbolt Dock Audio Module",
+		     "HP-Thunderbolt-Dock-Audio-Module"),
+
+	/* Two entries for Gigabyte TRX40 Aorus Master:
+	 * TRX40 Aorus Master has two USB-audio devices, one for the front
+	 * headphone with ESS SABRE9218 DAC chip, while another for the rest
+	 * I/O (the rear panel and the front mic) with Realtek ALC1220-VB.
+	 * Here we provide two distinct names for making UCM profiles easier.
+	 */
+	PROFILE_NAME(0x0414, 0xa000, "Gigabyte", "Aorus Master Front Headphone",
+		     "Gigabyte-Aorus-Master-Front-Headphone"),
+	PROFILE_NAME(0x0414, 0xa001, "Gigabyte", "Aorus Master Main Audio",
+		     "Gigabyte-Aorus-Master-Main-Audio"),
+
+	/* Gigabyte TRX40 Aorus Pro WiFi */
+	PROFILE_NAME(0x0414, 0xa002,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+
+	/* Creative/E-Mu devices */
+	DEVICE_NAME(0x041e, 0x3010, "Creative Labs", "Sound Blaster MP3+"),
+	/* Creative/Toshiba Multimedia Center SB-0500 */
+	DEVICE_NAME(0x041e, 0x3048, "Toshiba", "SB-0500"),
+
+	DEVICE_NAME(0x046d, 0x0990, "Logitech, Inc.", "QuickCam Pro 9000"),
+
+	DEVICE_NAME(0x05e1, 0x0408, "Syntek", "STK1160"),
+	DEVICE_NAME(0x05e1, 0x0480, "Hauppauge", "Woodbury"),
+
+	/* ASUS ROG Zenith II: this machine has also two devices, one for
+	 * the front headphone and another for the rest
+	 */
+	PROFILE_NAME(0x0b05, 0x1915, "ASUS", "Zenith II Front Headphone",
+		     "Zenith-II-Front-Headphone"),
+	PROFILE_NAME(0x0b05, 0x1916, "ASUS", "Zenith II Main Audio",
+		     "Zenith-II-Main-Audio"),
+
+	/* ASUS ROG Strix */
+	PROFILE_NAME(0x0b05, 0x1917,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+	/* ASUS PRIME TRX40 PRO-S */
+	PROFILE_NAME(0x0b05, 0x1918,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+
+	/* Dell WD15 Dock */
+	PROFILE_NAME(0x0bda, 0x4014, "Dell", "WD15 Dock", "Dell-WD15-Dock"),
+	/* Dell WD19 Dock */
+	PROFILE_NAME(0x0bda, 0x402e, "Dell", "WD19 Dock", "Dell-WD15-Dock"),
+
+	DEVICE_NAME(0x0ccd, 0x0028, "TerraTec", "Aureon5.1MkII"),
+
+	/*
+	 * The original product_name is "USB Sound Device", however this name
+	 * is also used by the CM106 based cards, so make it unique.
+	 */
+	DEVICE_NAME(0x0d8c, 0x0102, NULL, "ICUSBAUDIO7D"),
+	DEVICE_NAME(0x0d8c, 0x0103, NULL, "Audio Advantage MicroII"),
+
+	/* MSI TRX40 Creator */
+	PROFILE_NAME(0x0db0, 0x0d64,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+	/* MSI TRX40 */
+	PROFILE_NAME(0x0db0, 0x543d,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+
+	DEVICE_NAME(0x0fd9, 0x0008, "Hauppauge", "HVR-950Q"),
+
+	/* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */
+	DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"),
+	DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
+
+	/* aka. Serato Scratch Live DJ Box */
+	DEVICE_NAME(0x13e5, 0x0001, "Rane", "SL-1"),
+
+	/* Lenovo ThinkStation P620 Rear Line-in, Line-out and Microphone */
+	PROFILE_NAME(0x17aa, 0x1046, "Lenovo", "ThinkStation P620 Rear",
+		     "Lenovo-ThinkStation-P620-Rear"),
+	/* Lenovo ThinkStation P620 Internal Speaker + Front Headset */
+	PROFILE_NAME(0x17aa, 0x104d, "Lenovo", "ThinkStation P620 Main",
+		     "Lenovo-ThinkStation-P620-Main"),
+
+	/* Asrock TRX40 Creator */
+	PROFILE_NAME(0x26ce, 0x0a01,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+
+	DEVICE_NAME(0x2040, 0x7200, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7201, "Hauppauge", "HVR-950Q-MXL"),
+	DEVICE_NAME(0x2040, 0x7210, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7211, "Hauppauge", "HVR-950Q-MXL"),
+	DEVICE_NAME(0x2040, 0x7213, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7217, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x721b, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x721e, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x721f, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7240, "Hauppauge", "HVR-850"),
+	DEVICE_NAME(0x2040, 0x7260, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7280, "Hauppauge", "HVR-950Q"),
+	DEVICE_NAME(0x2040, 0x7281, "Hauppauge", "HVR-950Q-MXL"),
+	DEVICE_NAME(0x2040, 0x8200, "Hauppauge", "Woodbury"),
+
+	{ } /* terminator */
+};
+
+static const struct usb_audio_device_name *
+lookup_device_name(u32 id)
+{
+	static const struct usb_audio_device_name *p;
+
+	for (p = usb_audio_names; p->id; p++)
+		if (p->id == id)
+			return p;
+	return NULL;
+}
+
+/*
+ * free the chip instance
+ *
+ * here we have to do not much, since pcm and controls are already freed
+ *
+ */
+
+static void snd_usb_audio_free(struct snd_card *card)
+{
+	struct snd_usb_audio *chip = card->private_data;
+
+	snd_usb_endpoint_free_all(chip);
+
+	mutex_destroy(&chip->mutex);
+	if (!atomic_read(&chip->shutdown))
+		dev_set_drvdata(&chip->dev->dev, NULL);
+}
+
+static void usb_audio_make_shortname(struct usb_device *dev,
+				     struct snd_usb_audio *chip,
+				     const struct snd_usb_audio_quirk *quirk)
+{
+	struct snd_card *card = chip->card;
+	const struct usb_audio_device_name *preset;
+	const char *s = NULL;
+
+	preset = lookup_device_name(chip->usb_id);
+	if (preset && preset->product_name)
+		s = preset->product_name;
+	else if (quirk && quirk->product_name)
+		s = quirk->product_name;
+	if (s && *s) {
+		strscpy(card->shortname, s, sizeof(card->shortname));
+		return;
+	}
+
+	/* retrieve the device string as shortname */
+	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));
+	}
+
+	strim(card->shortname);
+}
+
+static void usb_audio_make_longname(struct usb_device *dev,
+				    struct snd_usb_audio *chip,
+				    const struct snd_usb_audio_quirk *quirk)
+{
+	struct snd_card *card = chip->card;
+	const struct usb_audio_device_name *preset;
+	const char *s = NULL;
+	int len;
+
+	preset = lookup_device_name(chip->usb_id);
+
+	/* shortcut - if any pre-defined string is given, use it */
+	if (preset && preset->profile_name)
+		s = preset->profile_name;
+	if (s && *s) {
+		strscpy(card->longname, s, sizeof(card->longname));
+		return;
+	}
+
+	if (preset && preset->vendor_name)
+		s = preset->vendor_name;
+	else if (quirk && quirk->vendor_name)
+		s = quirk->vendor_name;
+	*card->longname = 0;
+	if (s && *s) {
+		strscpy(card->longname, s, sizeof(card->longname));
+	} else {
+		/* retrieve the vendor and device strings as longname */
+		if (dev->descriptor.iManufacturer)
+			usb_string(dev, dev->descriptor.iManufacturer,
+				   card->longname, sizeof(card->longname));
+		/* we don't really care if there isn't any vendor string */
+	}
+	if (*card->longname) {
+		strim(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;
+	case USB_SPEED_SUPER_PLUS:
+		strlcat(card->longname, ", super speed plus", sizeof(card->longname));
+		break;
+	default:
+		break;
+	}
+}
+
+/*
+ * create a chip instance and set its names.
+ */
+static int snd_usb_audio_create(struct usb_interface *intf,
+				struct usb_device *dev, int idx,
+				const struct snd_usb_audio_quirk *quirk,
+				unsigned int usb_id,
+				struct snd_usb_audio **rchip)
+{
+	struct snd_card *card;
+	struct snd_usb_audio *chip;
+	int err;
+	char component[14];
+
+	*rchip = NULL;
+
+	switch (snd_usb_get_speed(dev)) {
+	case USB_SPEED_LOW:
+	case USB_SPEED_FULL:
+	case USB_SPEED_HIGH:
+	case USB_SPEED_WIRELESS:
+	case USB_SPEED_SUPER:
+	case USB_SPEED_SUPER_PLUS:
+		break;
+	default:
+		dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
+		return -ENXIO;
+	}
+
+	err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
+			   sizeof(*chip), &card);
+	if (err < 0) {
+		dev_err(&dev->dev, "cannot create card instance %d\n", idx);
+		return err;
+	}
+
+	chip = card->private_data;
+	mutex_init(&chip->mutex);
+	init_waitqueue_head(&chip->shutdown_wait);
+	chip->index = idx;
+	chip->dev = dev;
+	chip->card = card;
+	chip->setup = device_setup[idx];
+	chip->generic_implicit_fb = implicit_fb[idx];
+	chip->autoclock = autoclock;
+	chip->lowlatency = lowlatency;
+	atomic_set(&chip->active, 1); /* avoid autopm during probing */
+	atomic_set(&chip->usage_count, 0);
+	atomic_set(&chip->shutdown, 0);
+
+	chip->usb_id = usb_id;
+	INIT_LIST_HEAD(&chip->pcm_list);
+	INIT_LIST_HEAD(&chip->ep_list);
+	INIT_LIST_HEAD(&chip->iface_ref_list);
+	INIT_LIST_HEAD(&chip->clock_ref_list);
+	INIT_LIST_HEAD(&chip->midi_list);
+	INIT_LIST_HEAD(&chip->mixer_list);
+
+	if (quirk_flags[idx])
+		chip->quirk_flags = quirk_flags[idx];
+	else
+		snd_usb_init_quirk_flags(chip);
+
+	card->private_free = snd_usb_audio_free;
+
+	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);
+
+	usb_audio_make_shortname(dev, chip, quirk);
+	usb_audio_make_longname(dev, chip, quirk);
+
+	snd_usb_audio_create_proc(chip);
+
+	*rchip = chip;
+	return 0;
+}
+
+/* look for a matching quirk alias id */
+static bool get_alias_id(struct usb_device *dev, unsigned int *id)
+{
+	int i;
+	unsigned int src, dst;
+
+	for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
+		if (!quirk_alias[i] ||
+		    sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
+		    src != *id)
+			continue;
+		dev_info(&dev->dev,
+			 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
+			 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
+			 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
+		*id = dst;
+		return true;
+	}
+
+	return false;
+}
+
+static int check_delayed_register_option(struct snd_usb_audio *chip)
+{
+	int i;
+	unsigned int id, inum;
+
+	for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
+		if (delayed_register[i] &&
+		    sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
+		    id == chip->usb_id)
+			return inum;
+	}
+
+	return -1;
+}
+
+static const struct usb_device_id usb_audio_ids[]; /* defined below */
+
+/* look for the last interface that matches with our ids and remember it */
+static void find_last_interface(struct snd_usb_audio *chip)
+{
+	struct usb_host_config *config = chip->dev->actconfig;
+	struct usb_interface *intf;
+	int i;
+
+	if (!config)
+		return;
+	for (i = 0; i < config->desc.bNumInterfaces; i++) {
+		intf = config->interface[i];
+		if (usb_match_id(intf, usb_audio_ids))
+			chip->last_iface = intf->altsetting[0].desc.bInterfaceNumber;
+	}
+	usb_audio_dbg(chip, "Found last interface = %d\n", chip->last_iface);
+}
+
+/* look for the corresponding quirk */
+static const struct snd_usb_audio_quirk *
+get_alias_quirk(struct usb_device *dev, unsigned int id)
+{
+	const struct usb_device_id *p;
+
+	for (p = usb_audio_ids; p->match_flags; p++) {
+		/* FIXME: this checks only vendor:product pair in the list */
+		if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
+		    USB_DEVICE_ID_MATCH_DEVICE &&
+		    p->idVendor == USB_ID_VENDOR(id) &&
+		    p->idProduct == USB_ID_PRODUCT(id))
+			return (const struct snd_usb_audio_quirk *)p->driver_info;
+	}
+
+	return NULL;
+}
+
+/* register card if we reach to the last interface or to the specified
+ * one given via option
+ */
+static int try_to_register_card(struct snd_usb_audio *chip, int ifnum)
+{
+	if (check_delayed_register_option(chip) == ifnum ||
+	    chip->last_iface == ifnum ||
+	    usb_interface_claimed(usb_ifnum_to_if(chip->dev, chip->last_iface)))
+		return snd_card_register(chip->card);
+	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 int usb_audio_probe(struct usb_interface *intf,
+			   const struct usb_device_id *usb_id)
+{
+	struct usb_device *dev = interface_to_usbdev(intf);
+	const struct snd_usb_audio_quirk *quirk =
+		(const struct snd_usb_audio_quirk *)usb_id->driver_info;
+	struct snd_usb_audio *chip;
+	int i, err;
+	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 (get_alias_id(dev, &id))
+		quirk = get_alias_quirk(dev, id);
+	if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
+		return -ENXIO;
+	if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
+		return -ENODEV;
+
+	err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
+	if (err < 0)
+		return err;
+
+	/*
+	 * 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 (atomic_read(&usb_chip[i]->shutdown)) {
+				dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
+				err = -EIO;
+				goto __error;
+			}
+			chip = usb_chip[i];
+			atomic_inc(&chip->active); /* avoid autopm */
+			break;
+		}
+	}
+	if (! chip) {
+		err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
+		if (err < 0)
+			goto __error;
+
+		/* 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 (!usb_chip[i] &&
+			    (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
+			    (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
+				if (enable[i]) {
+					err = snd_usb_audio_create(intf, dev, i, quirk,
+								   id, &chip);
+					if (err < 0)
+						goto __error;
+					break;
+				} else if (vid[i] != -1 || pid[i] != -1) {
+					dev_info(&dev->dev,
+						 "device (%04x:%04x) is disabled\n",
+						 USB_ID_VENDOR(id),
+						 USB_ID_PRODUCT(id));
+					err = -ENOENT;
+					goto __error;
+				}
+			}
+		if (!chip) {
+			dev_err(&dev->dev, "no available usb audio device\n");
+			err = -ENODEV;
+			goto __error;
+		}
+		find_last_interface(chip);
+	}
+
+	if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
+		dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
+		err = -EINVAL;
+		goto __error;
+	}
+
+	dev_set_drvdata(&dev->dev, chip);
+
+	if (ignore_ctl_error)
+		chip->quirk_flags |= QUIRK_FLAG_IGNORE_CTL_ERROR;
+
+	if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
+		usb_disable_autosuspend(interface_to_usbdev(intf));
+
+	/*
+	 * 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;
+
+	err = 1; /* continue */
+	if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
+		/* need some special handlings */
+		err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
+		if (err < 0)
+			goto __error;
+	}
+
+	if (err > 0) {
+		/* create normal USB audio interfaces */
+		err = snd_usb_create_streams(chip, ifnum);
+		if (err < 0)
+			goto __error;
+		err = snd_usb_create_mixer(chip, ifnum);
+		if (err < 0)
+			goto __error;
+	}
+
+	if (chip->need_delayed_register) {
+		dev_info(&dev->dev,
+			 "Found post-registration device assignment: %08x:%02x\n",
+			 chip->usb_id, ifnum);
+		chip->need_delayed_register = false; /* clear again */
+	}
+
+	err = try_to_register_card(chip, ifnum);
+	if (err < 0)
+		goto __error_no_register;
+
+	if (chip->quirk_flags & QUIRK_FLAG_SHARE_MEDIA_DEVICE) {
+		/* don't want to fail when snd_media_device_create() fails */
+		snd_media_device_create(chip, intf);
+	}
+
+	if (quirk)
+		chip->quirk_type = quirk->type;
+
+	usb_chip[chip->index] = chip;
+	chip->intf[chip->num_interfaces] = intf;
+	chip->num_interfaces++;
+	usb_set_intfdata(intf, chip);
+	atomic_dec(&chip->active);
+	mutex_unlock(&register_mutex);
+	return 0;
+
+ __error:
+	/* in the case of error in secondary interface, still try to register */
+	if (chip)
+		try_to_register_card(chip, ifnum);
+
+ __error_no_register:
+	if (chip) {
+		/* chip->active is inside the chip->card object,
+		 * decrement before memory is possibly returned.
+		 */
+		atomic_dec(&chip->active);
+		if (!chip->num_interfaces)
+			snd_card_free(chip->card);
+	}
+	mutex_unlock(&register_mutex);
+	return err;
+}
+
+/*
+ * we need to take care of counter, since disconnection can be called also
+ * many times as well as usb_audio_probe().
+ */
+static void usb_audio_disconnect(struct usb_interface *intf)
+{
+	struct snd_usb_audio *chip = usb_get_intfdata(intf);
+	struct snd_card *card;
+	struct list_head *p;
+
+	if (chip == USB_AUDIO_IFACE_UNUSED)
+		return;
+
+	card = chip->card;
+
+	mutex_lock(&register_mutex);
+	if (atomic_inc_return(&chip->shutdown) == 1) {
+		struct snd_usb_stream *as;
+		struct snd_usb_endpoint *ep;
+		struct usb_mixer_interface *mixer;
+
+		/* wait until all pending tasks done;
+		 * they are protected by snd_usb_lock_shutdown()
+		 */
+		wait_event(chip->shutdown_wait,
+			   !atomic_read(&chip->usage_count));
+		snd_card_disconnect(card);
+		/* release the pcm resources */
+		list_for_each_entry(as, &chip->pcm_list, list) {
+			snd_usb_stream_disconnect(as);
+		}
+		/* release the endpoint resources */
+		list_for_each_entry(ep, &chip->ep_list, list) {
+			snd_usb_endpoint_release(ep);
+		}
+		/* release the midi resources */
+		list_for_each(p, &chip->midi_list) {
+			snd_usbmidi_disconnect(p);
+		}
+		/*
+		 * Nice to check quirk && quirk->shares_media_device and
+		 * then call the snd_media_device_delete(). Don't have
+		 * access to the quirk here. snd_media_device_delete()
+		 * accesses mixer_list
+		 */
+		snd_media_device_delete(chip);
+
+		/* release mixer resources */
+		list_for_each_entry(mixer, &chip->mixer_list, list) {
+			snd_usb_mixer_disconnect(mixer);
+		}
+	}
+
+	if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
+		usb_enable_autosuspend(interface_to_usbdev(intf));
+
+	chip->num_interfaces--;
+	if (chip->num_interfaces <= 0) {
+		usb_chip[chip->index] = NULL;
+		mutex_unlock(&register_mutex);
+		snd_card_free_when_closed(card);
+	} else {
+		mutex_unlock(&register_mutex);
+	}
+}
+
+/* lock the shutdown (disconnect) task and autoresume */
+int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
+{
+	int err;
+
+	atomic_inc(&chip->usage_count);
+	if (atomic_read(&chip->shutdown)) {
+		err = -EIO;
+		goto error;
+	}
+	err = snd_usb_autoresume(chip);
+	if (err < 0)
+		goto error;
+	return 0;
+
+ error:
+	if (atomic_dec_and_test(&chip->usage_count))
+		wake_up(&chip->shutdown_wait);
+	return err;
+}
+
+/* autosuspend and unlock the shutdown */
+void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
+{
+	snd_usb_autosuspend(chip);
+	if (atomic_dec_and_test(&chip->usage_count))
+		wake_up(&chip->shutdown_wait);
+}
+
+int snd_usb_autoresume(struct snd_usb_audio *chip)
+{
+	int i, err;
+
+	if (atomic_read(&chip->shutdown))
+		return -EIO;
+	if (atomic_inc_return(&chip->active) != 1)
+		return 0;
+
+	for (i = 0; i < chip->num_interfaces; i++) {
+		err = usb_autopm_get_interface(chip->intf[i]);
+		if (err < 0) {
+			/* rollback */
+			while (--i >= 0)
+				usb_autopm_put_interface(chip->intf[i]);
+			atomic_dec(&chip->active);
+			return err;
+		}
+	}
+	return 0;
+}
+
+void snd_usb_autosuspend(struct snd_usb_audio *chip)
+{
+	int i;
+
+	if (atomic_read(&chip->shutdown))
+		return;
+	if (!atomic_dec_and_test(&chip->active))
+		return;
+
+	for (i = 0; i < chip->num_interfaces; i++)
+		usb_autopm_put_interface(chip->intf[i]);
+}
+
+static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct snd_usb_audio *chip = usb_get_intfdata(intf);
+	struct snd_usb_stream *as;
+	struct snd_usb_endpoint *ep;
+	struct usb_mixer_interface *mixer;
+	struct list_head *p;
+
+	if (chip == USB_AUDIO_IFACE_UNUSED)
+		return 0;
+
+	if (!chip->num_suspended_intf++) {
+		list_for_each_entry(as, &chip->pcm_list, list)
+			snd_usb_pcm_suspend(as);
+		list_for_each_entry(ep, &chip->ep_list, list)
+			snd_usb_endpoint_suspend(ep);
+		list_for_each(p, &chip->midi_list)
+			snd_usbmidi_suspend(p);
+		list_for_each_entry(mixer, &chip->mixer_list, list)
+			snd_usb_mixer_suspend(mixer);
+	}
+
+	if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
+		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
+		chip->system_suspend = chip->num_suspended_intf;
+	}
+
+	return 0;
+}
+
+static int usb_audio_resume(struct usb_interface *intf)
+{
+	struct snd_usb_audio *chip = usb_get_intfdata(intf);
+	struct snd_usb_stream *as;
+	struct usb_mixer_interface *mixer;
+	struct list_head *p;
+	int err = 0;
+
+	if (chip == USB_AUDIO_IFACE_UNUSED)
+		return 0;
+
+	atomic_inc(&chip->active); /* avoid autopm */
+	if (chip->num_suspended_intf > 1)
+		goto out;
+
+	list_for_each_entry(as, &chip->pcm_list, list) {
+		err = snd_usb_pcm_resume(as);
+		if (err < 0)
+			goto err_out;
+	}
+
+	/*
+	 * 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_resume(mixer);
+		if (err < 0)
+			goto err_out;
+	}
+
+	list_for_each(p, &chip->midi_list) {
+		snd_usbmidi_resume(p);
+	}
+
+ out:
+	if (chip->num_suspended_intf == chip->system_suspend) {
+		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
+		chip->system_suspend = 0;
+	}
+	chip->num_suspended_intf--;
+
+err_out:
+	atomic_dec(&chip->active); /* allow autopm after this point */
+	return err;
+}
+
+static const 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,
+	.reset_resume =	usb_audio_resume,
+	.id_table =	usb_audio_ids,
+	.supports_autosuspend = 1,
+};
+
+module_usb_driver(usb_audio_driver);