sound/usb/usx2y/us122l.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
  */

 #include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/usb/audio.h>
 #include <linux/module.h>
 #include <sound/core.h>
 #include <sound/hwdep.h>
 #include <sound/pcm.h>
 #include <sound/initval.h>
 #define MODNAME "US122L"
 #include "usb_stream.c"
 #include "../usbaudio.h"
 #include "../midi.h"
 #include "us122l.h"

 MODULE_AUTHOR("Karsten Wiese <fzu@wemgehoertderstaat.de>");
 MODULE_DESCRIPTION("TASCAM "NAME_ALLCAPS" Version 0.5");
 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 */
 							/* Enable this card */
 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for "NAME_ALLCAPS".");
 module_param_array(id, charp, NULL, 0444);
 MODULE_PARM_DESC(id, "ID string for "NAME_ALLCAPS".");
 module_param_array(enable, bool, NULL, 0444);
 MODULE_PARM_DESC(enable, "Enable "NAME_ALLCAPS".");

 /* driver_info flags */
 #define US122L_FLAG_US144	BIT(0)

 static int snd_us122l_card_used[SNDRV_CARDS];

 static int us122l_create_usbmidi(struct snd_card *card)
 {
 	static struct snd_usb_midi_endpoint_info quirk_data = {
 		.out_ep = 4,
 		.in_ep = 3,
 		.out_cables =	0x001,
 		.in_cables =	0x001
 	};
 	static struct snd_usb_audio_quirk quirk = {
 		.vendor_name =	"US122L",
 		.product_name =	NAME_ALLCAPS,
 		.ifnum = 	1,
 		.type = QUIRK_MIDI_US122L,
 		.data = &quirk_data
 	};
 	struct usb_device *dev = US122L(card)->dev;
 	struct usb_interface *iface = usb_ifnum_to_if(dev, 1);

 	return snd_usbmidi_create(card, iface,
 				  &US122L(card)->midi_list, &quirk);
 }

 static int us144_create_usbmidi(struct snd_card *card)
 {
 	static struct snd_usb_midi_endpoint_info quirk_data = {
 		.out_ep = 4,
 		.in_ep = 3,
 		.out_cables =	0x001,
 		.in_cables =	0x001
 	};
 	static struct snd_usb_audio_quirk quirk = {
 		.vendor_name =	"US144",
 		.product_name =	NAME_ALLCAPS,
 		.ifnum = 	0,
 		.type = QUIRK_MIDI_US122L,
 		.data = &quirk_data
 	};
 	struct usb_device *dev = US122L(card)->dev;
 	struct usb_interface *iface = usb_ifnum_to_if(dev, 0);

 	return snd_usbmidi_create(card, iface,
 				  &US122L(card)->midi_list, &quirk);
 }

 /*
  * Wrapper for usb_control_msg().
  * Allocates a temp buffer to prevent dmaing from/to the stack.
  */
 static int us122l_ctl_msg(struct usb_device *dev, unsigned int pipe,
 			  __u8 request, __u8 requesttype,
 			  __u16 value, __u16 index, void *data,
 			  __u16 size, int timeout)
 {
 	int err;
 	void *buf = NULL;

 	if (size > 0) {
 		buf = kmemdup(data, size, GFP_KERNEL);
 		if (!buf)
 			return -ENOMEM;
 	}
 	err = usb_control_msg(dev, pipe, request, requesttype,
 			      value, index, buf, size, timeout);
 	if (size > 0) {
 		memcpy(data, buf, size);
 		kfree(buf);
 	}
 	return err;
 }

 static void pt_info_set(struct usb_device *dev, u8 v)
 {
 	int ret;

 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 			      'I',
 			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			      v, 0, NULL, 0, 1000);
 	snd_printdd(KERN_DEBUG "%i\n", ret);
 }

 static void usb_stream_hwdep_vm_open(struct vm_area_struct *area)
 {
 	struct us122l *us122l = area->vm_private_data;
 	atomic_inc(&us122l->mmap_count);
 	snd_printdd(KERN_DEBUG "%i\n", atomic_read(&us122l->mmap_count));
 }

 static vm_fault_t usb_stream_hwdep_vm_fault(struct vm_fault *vmf)
 {
 	unsigned long offset;
 	struct page *page;
 	void *vaddr;
 	struct us122l *us122l = vmf->vma->vm_private_data;
 	struct usb_stream *s;

 	mutex_lock(&us122l->mutex);
 	s = us122l->sk.s;
 	if (!s)
 		goto unlock;

 	offset = vmf->pgoff << PAGE_SHIFT;
 	if (offset < PAGE_ALIGN(s->read_size))
 		vaddr = (char *)s + offset;
 	else {
 		offset -= PAGE_ALIGN(s->read_size);
 		if (offset >= PAGE_ALIGN(s->write_size))
 			goto unlock;

 		vaddr = us122l->sk.write_page + offset;
 	}
 	page = virt_to_page(vaddr);

 	get_page(page);
 	mutex_unlock(&us122l->mutex);

 	vmf->page = page;

 	return 0;
 unlock:
 	mutex_unlock(&us122l->mutex);
 	return VM_FAULT_SIGBUS;
 }

 static void usb_stream_hwdep_vm_close(struct vm_area_struct *area)
 {
 	struct us122l *us122l = area->vm_private_data;
 	atomic_dec(&us122l->mmap_count);
 	snd_printdd(KERN_DEBUG "%i\n", atomic_read(&us122l->mmap_count));
 }

 static const struct vm_operations_struct usb_stream_hwdep_vm_ops = {
 	.open = usb_stream_hwdep_vm_open,
 	.fault = usb_stream_hwdep_vm_fault,
 	.close = usb_stream_hwdep_vm_close,
 };


 static int usb_stream_hwdep_open(struct snd_hwdep *hw, struct file *file)
 {
 	struct us122l	*us122l = hw->private_data;
 	struct usb_interface *iface;
 	snd_printdd(KERN_DEBUG "%p %p\n", hw, file);
 	if (hw->used >= 2)
 		return -EBUSY;

 	if (!us122l->first)
 		us122l->first = file;

 	if (us122l->is_us144) {
 		iface = usb_ifnum_to_if(us122l->dev, 0);
 		usb_autopm_get_interface(iface);
 	}
 	iface = usb_ifnum_to_if(us122l->dev, 1);
 	usb_autopm_get_interface(iface);
 	return 0;
 }

 static int usb_stream_hwdep_release(struct snd_hwdep *hw, struct file *file)
 {
 	struct us122l	*us122l = hw->private_data;
 	struct usb_interface *iface;
 	snd_printdd(KERN_DEBUG "%p %p\n", hw, file);

 	if (us122l->is_us144) {
 		iface = usb_ifnum_to_if(us122l->dev, 0);
 		usb_autopm_put_interface(iface);
 	}
 	iface = usb_ifnum_to_if(us122l->dev, 1);
 	usb_autopm_put_interface(iface);
 	if (us122l->first == file)
 		us122l->first = NULL;
 	mutex_lock(&us122l->mutex);
 	if (us122l->master == file)
 		us122l->master = us122l->slave;

 	us122l->slave = NULL;
 	mutex_unlock(&us122l->mutex);
 	return 0;
 }

 static int usb_stream_hwdep_mmap(struct snd_hwdep *hw,
 				 struct file *filp, struct vm_area_struct *area)
 {
 	unsigned long	size = area->vm_end - area->vm_start;
 	struct us122l	*us122l = hw->private_data;
 	unsigned long offset;
 	struct usb_stream *s;
 	int err = 0;
 	bool read;

 	offset = area->vm_pgoff << PAGE_SHIFT;
 	mutex_lock(&us122l->mutex);
 	s = us122l->sk.s;
 	read = offset < s->read_size;
 	if (read && area->vm_flags & VM_WRITE) {
 		err = -EPERM;
 		goto out;
 	}
 	snd_printdd(KERN_DEBUG "%lu %u\n", size,
 		    read ? s->read_size : s->write_size);
 	/* if userspace tries to mmap beyond end of our buffer, fail */
 	if (size > PAGE_ALIGN(read ? s->read_size : s->write_size)) {
 		snd_printk(KERN_WARNING "%lu > %u\n", size,
 			   read ? s->read_size : s->write_size);
 		err = -EINVAL;
 		goto out;
 	}

 	area->vm_ops = &usb_stream_hwdep_vm_ops;
 	area->vm_flags |= VM_DONTDUMP;
 	if (!read)
 		area->vm_flags |= VM_DONTEXPAND;
 	area->vm_private_data = us122l;
 	atomic_inc(&us122l->mmap_count);
 out:
 	mutex_unlock(&us122l->mutex);
 	return err;
 }

 static __poll_t usb_stream_hwdep_poll(struct snd_hwdep *hw,
 					  struct file *file, poll_table *wait)
 {
 	struct us122l	*us122l = hw->private_data;
 	unsigned	*polled;
 	__poll_t	mask;

 	poll_wait(file, &us122l->sk.sleep, wait);

 	mask = EPOLLIN | EPOLLOUT | EPOLLWRNORM | EPOLLERR;
 	if (mutex_trylock(&us122l->mutex)) {
 		struct usb_stream *s = us122l->sk.s;
 		if (s && s->state == usb_stream_ready) {
 			if (us122l->first == file)
 				polled = &s->periods_polled;
 			else
 				polled = &us122l->second_periods_polled;
 			if (*polled != s->periods_done) {
 				*polled = s->periods_done;
 				mask = EPOLLIN | EPOLLOUT | EPOLLWRNORM;
 			} else
 				mask = 0;
 		}
 		mutex_unlock(&us122l->mutex);
 	}
 	return mask;
 }

 static void us122l_stop(struct us122l *us122l)
 {
 	struct list_head *p;
 	list_for_each(p, &us122l->midi_list)
 		snd_usbmidi_input_stop(p);

 	usb_stream_stop(&us122l->sk);
 	usb_stream_free(&us122l->sk);
 }

 static int us122l_set_sample_rate(struct usb_device *dev, int rate)
 {
 	unsigned int ep = 0x81;
 	unsigned char data[3];
 	int err;

 	data[0] = rate;
 	data[1] = rate >> 8;
 	data[2] = rate >> 16;
 	err = us122l_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 			     USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 			     UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000);
 	if (err < 0)
 		snd_printk(KERN_ERR "%d: cannot set freq %d to ep 0x%x\n",
 			   dev->devnum, rate, ep);
 	return err;
 }

 static bool us122l_start(struct us122l *us122l,
 			 unsigned rate, unsigned period_frames)
 {
 	struct list_head *p;
 	int err;
 	unsigned use_packsize = 0;
 	bool success = false;

 	if (us122l->dev->speed == USB_SPEED_HIGH) {
 		/* The us-122l's descriptor defaults to iso max_packsize 78,
 		   which isn't needed for samplerates <= 48000.
 		   Lets save some memory:
 		*/
 		switch (rate) {
 		case 44100:
 			use_packsize = 36;
 			break;
 		case 48000:
 			use_packsize = 42;
 			break;
 		case 88200:
 			use_packsize = 72;
 			break;
 		}
 	}
 	if (!usb_stream_new(&us122l->sk, us122l->dev, 1, 2,
 			    rate, use_packsize, period_frames, 6))
 		goto out;

 	err = us122l_set_sample_rate(us122l->dev, rate);
 	if (err < 0) {
 		us122l_stop(us122l);
 		snd_printk(KERN_ERR "us122l_set_sample_rate error \n");
 		goto out;
 	}
 	err = usb_stream_start(&us122l->sk);
 	if (err < 0) {
 		us122l_stop(us122l);
 		snd_printk(KERN_ERR "us122l_start error %i \n", err);
 		goto out;
 	}
 	list_for_each(p, &us122l->midi_list)
 		snd_usbmidi_input_start(p);
 	success = true;
 out:
 	return success;
 }

 static int usb_stream_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
 				  unsigned cmd, unsigned long arg)
 {
 	struct usb_stream_config cfg;
 	struct us122l *us122l = hw->private_data;
 	struct usb_stream *s;
 	unsigned min_period_frames;
 	int err = 0;
 	bool high_speed;

 	if (cmd != SNDRV_USB_STREAM_IOCTL_SET_PARAMS)
 		return -ENOTTY;

 	if (copy_from_user(&cfg, (void __user *)arg, sizeof(cfg)))
 		return -EFAULT;

 	if (cfg.version != USB_STREAM_INTERFACE_VERSION)
 		return -ENXIO;

 	high_speed = us122l->dev->speed == USB_SPEED_HIGH;
 	if ((cfg.sample_rate != 44100 && cfg.sample_rate != 48000  &&
 	     (!high_speed ||
 	      (cfg.sample_rate != 88200 && cfg.sample_rate != 96000))) ||
 	    cfg.frame_size != 6 ||
 	    cfg.period_frames > 0x3000)
 		return -EINVAL;

 	switch (cfg.sample_rate) {
 	case 44100:
 		min_period_frames = 48;
 		break;
 	case 48000:
 		min_period_frames = 52;
 		break;
 	default:
 		min_period_frames = 104;
 		break;
 	}
 	if (!high_speed)
 		min_period_frames <<= 1;
 	if (cfg.period_frames < min_period_frames)
 		return -EINVAL;

 	snd_power_wait(hw->card, SNDRV_CTL_POWER_D0);

 	mutex_lock(&us122l->mutex);
 	s = us122l->sk.s;
 	if (!us122l->master)
 		us122l->master = file;
 	else if (us122l->master != file) {
 		if (!s || memcmp(&cfg, &s->cfg, sizeof(cfg))) {
 			err = -EIO;
 			goto unlock;
 		}
 		us122l->slave = file;
 	}
 	if (!s || memcmp(&cfg, &s->cfg, sizeof(cfg)) ||
 	    s->state == usb_stream_xrun) {
 		us122l_stop(us122l);
 		if (!us122l_start(us122l, cfg.sample_rate, cfg.period_frames))
 			err = -EIO;
 		else
 			err = 1;
 	}
 unlock:
 	mutex_unlock(&us122l->mutex);
 	wake_up_all(&us122l->sk.sleep);
 	return err;
 }

 #define SND_USB_STREAM_ID "USB STREAM"
 static int usb_stream_hwdep_new(struct snd_card *card)
 {
 	int err;
 	struct snd_hwdep *hw;
 	struct usb_device *dev = US122L(card)->dev;

 	err = snd_hwdep_new(card, SND_USB_STREAM_ID, 0, &hw);
 	if (err < 0)
 		return err;

 	hw->iface = SNDRV_HWDEP_IFACE_USB_STREAM;
 	hw->private_data = US122L(card);
 	hw->ops.open = usb_stream_hwdep_open;
 	hw->ops.release = usb_stream_hwdep_release;
 	hw->ops.ioctl = usb_stream_hwdep_ioctl;
 	hw->ops.ioctl_compat = usb_stream_hwdep_ioctl;
 	hw->ops.mmap = usb_stream_hwdep_mmap;
 	hw->ops.poll = usb_stream_hwdep_poll;

 	sprintf(hw->name, "/dev/bus/usb/%03d/%03d/hwdeppcm",
 		dev->bus->busnum, dev->devnum);
 	return 0;
 }


 static bool us122l_create_card(struct snd_card *card)
 {
 	int err;
 	struct us122l *us122l = US122L(card);

 	if (us122l->is_us144) {
 		err = usb_set_interface(us122l->dev, 0, 1);
 		if (err) {
 			snd_printk(KERN_ERR "usb_set_interface error \n");
 			return false;
 		}
 	}
 	err = usb_set_interface(us122l->dev, 1, 1);
 	if (err) {
 		snd_printk(KERN_ERR "usb_set_interface error \n");
 		return false;
 	}

 	pt_info_set(us122l->dev, 0x11);
 	pt_info_set(us122l->dev, 0x10);

 	if (!us122l_start(us122l, 44100, 256))
 		return false;

 	if (us122l->is_us144)
 		err = us144_create_usbmidi(card);
 	else
 		err = us122l_create_usbmidi(card);
 	if (err < 0) {
 		snd_printk(KERN_ERR "us122l_create_usbmidi error %i \n", err);
 		goto stop;
 	}
 	err = usb_stream_hwdep_new(card);
 	if (err < 0) {
 /* release the midi resources */
 		struct list_head *p;
 		list_for_each(p, &us122l->midi_list)
 			snd_usbmidi_disconnect(p);

 		goto stop;
 	}
 	return true;

 stop:
 	us122l_stop(us122l);
 	return false;
 }

 static void snd_us122l_free(struct snd_card *card)
 {
 	struct us122l	*us122l = US122L(card);
 	int		index = us122l->card_index;
 	if (index >= 0  &&  index < SNDRV_CARDS)
 		snd_us122l_card_used[index] = 0;
 }

 static int usx2y_create_card(struct usb_device *device,
 			     struct usb_interface *intf,
 			     struct snd_card **cardp,
 			     unsigned long flags)
 {
 	int		dev;
 	struct snd_card *card;
 	int err;

 	for (dev = 0; dev < SNDRV_CARDS; ++dev)
 		if (enable[dev] && !snd_us122l_card_used[dev])
 			break;
 	if (dev >= SNDRV_CARDS)
 		return -ENODEV;
 	err = snd_card_new(&intf->dev, index[dev], id[dev], THIS_MODULE,
 			   sizeof(struct us122l), &card);
 	if (err < 0)
 		return err;
 	snd_us122l_card_used[US122L(card)->card_index = dev] = 1;
 	card->private_free = snd_us122l_free;
 	US122L(card)->dev = device;
 	mutex_init(&US122L(card)->mutex);
 	init_waitqueue_head(&US122L(card)->sk.sleep);
 	US122L(card)->is_us144 = flags & US122L_FLAG_US144;
 	INIT_LIST_HEAD(&US122L(card)->midi_list);
 	strcpy(card->driver, "USB "NAME_ALLCAPS"");
 	sprintf(card->shortname, "TASCAM "NAME_ALLCAPS"");
 	sprintf(card->longname, "%s (%x:%x if %d at %03d/%03d)",
 		card->shortname,
 		le16_to_cpu(device->descriptor.idVendor),
 		le16_to_cpu(device->descriptor.idProduct),
 		0,
 		US122L(card)->dev->bus->busnum,
 		US122L(card)->dev->devnum
 		);
 	*cardp = card;
 	return 0;
 }

 static int us122l_usb_probe(struct usb_interface *intf,
 			    const struct usb_device_id *device_id,
 			    struct snd_card **cardp)
 {
 	struct usb_device *device = interface_to_usbdev(intf);
 	struct snd_card *card;
 	int err;

 	err = usx2y_create_card(device, intf, &card, device_id->driver_info);
 	if (err < 0)
 		return err;

 	if (!us122l_create_card(card)) {
 		snd_card_free(card);
 		return -EINVAL;
 	}

 	err = snd_card_register(card);
 	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}

 	usb_get_intf(usb_ifnum_to_if(device, 0));
 	usb_get_dev(device);
 	*cardp = card;
 	return 0;
 }

 static int snd_us122l_probe(struct usb_interface *intf,
 			    const struct usb_device_id *id)
 {
 	struct usb_device *device = interface_to_usbdev(intf);
 	struct snd_card *card;
 	int err;

 	if (id->driver_info & US122L_FLAG_US144 &&
 			device->speed == USB_SPEED_HIGH) {
 		snd_printk(KERN_ERR "disable ehci-hcd to run US-144 \n");
 		return -ENODEV;
 	}

 	snd_printdd(KERN_DEBUG"%p:%i\n",
 		    intf, intf->cur_altsetting->desc.bInterfaceNumber);
 	if (intf->cur_altsetting->desc.bInterfaceNumber != 1)
 		return 0;

 	err = us122l_usb_probe(usb_get_intf(intf), id, &card);
 	if (err < 0) {
 		usb_put_intf(intf);
 		return err;
 	}

 	usb_set_intfdata(intf, card);
 	return 0;
 }

 static void snd_us122l_disconnect(struct usb_interface *intf)
 {
 	struct snd_card *card;
 	struct us122l *us122l;
 	struct list_head *p;

 	card = usb_get_intfdata(intf);
 	if (!card)
 		return;

 	snd_card_disconnect(card);

 	us122l = US122L(card);
 	mutex_lock(&us122l->mutex);
 	us122l_stop(us122l);
 	mutex_unlock(&us122l->mutex);

 /* release the midi resources */
 	list_for_each(p, &us122l->midi_list) {
 		snd_usbmidi_disconnect(p);
 	}

 	usb_put_intf(usb_ifnum_to_if(us122l->dev, 0));
 	usb_put_intf(usb_ifnum_to_if(us122l->dev, 1));
 	usb_put_dev(us122l->dev);

 	while (atomic_read(&us122l->mmap_count))
 		msleep(500);

 	snd_card_free(card);
 }

 static int snd_us122l_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct snd_card *card;
 	struct us122l *us122l;
 	struct list_head *p;

 	card = usb_get_intfdata(intf);
 	if (!card)
 		return 0;
 	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

 	us122l = US122L(card);
 	if (!us122l)
 		return 0;

 	list_for_each(p, &us122l->midi_list)
 		snd_usbmidi_input_stop(p);

 	mutex_lock(&us122l->mutex);
 	usb_stream_stop(&us122l->sk);
 	mutex_unlock(&us122l->mutex);

 	return 0;
 }

 static int snd_us122l_resume(struct usb_interface *intf)
 {
 	struct snd_card *card;
 	struct us122l *us122l;
 	struct list_head *p;
 	int err;

 	card = usb_get_intfdata(intf);
 	if (!card)
 		return 0;

 	us122l = US122L(card);
 	if (!us122l)
 		return 0;

 	mutex_lock(&us122l->mutex);
 	/* needed, doesn't restart without: */
 	if (us122l->is_us144) {
 		err = usb_set_interface(us122l->dev, 0, 1);
 		if (err) {
 			snd_printk(KERN_ERR "usb_set_interface error \n");
 			goto unlock;
 		}
 	}
 	err = usb_set_interface(us122l->dev, 1, 1);
 	if (err) {
 		snd_printk(KERN_ERR "usb_set_interface error \n");
 		goto unlock;
 	}

 	pt_info_set(us122l->dev, 0x11);
 	pt_info_set(us122l->dev, 0x10);

 	err = us122l_set_sample_rate(us122l->dev,
 				     us122l->sk.s->cfg.sample_rate);
 	if (err < 0) {
 		snd_printk(KERN_ERR "us122l_set_sample_rate error \n");
 		goto unlock;
 	}
 	err = usb_stream_start(&us122l->sk);
 	if (err)
 		goto unlock;

 	list_for_each(p, &us122l->midi_list)
 		snd_usbmidi_input_start(p);
 unlock:
 	mutex_unlock(&us122l->mutex);
 	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 	return err;
 }

 static const struct usb_device_id snd_us122l_usb_id_table[] = {
 	{
 		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
 		.idVendor =	0x0644,
 		.idProduct =	USB_ID_US122L
 	},
 	{	/* US-144 only works at USB1.1! Disable module ehci-hcd. */
 		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
 		.idVendor =	0x0644,
 		.idProduct =	USB_ID_US144,
 		.driver_info =	US122L_FLAG_US144
 	},
 	{
 		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
 		.idVendor =	0x0644,
 		.idProduct =	USB_ID_US122MKII
 	},
 	{
 		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
 		.idVendor =	0x0644,
 		.idProduct =	USB_ID_US144MKII,
 		.driver_info =	US122L_FLAG_US144
 	},
 	{ /* terminator */ }
 };

 MODULE_DEVICE_TABLE(usb, snd_us122l_usb_id_table);
 static struct usb_driver snd_us122l_usb_driver = {
 	.name =		"snd-usb-us122l",
 	.probe =	snd_us122l_probe,
 	.disconnect =	snd_us122l_disconnect,
 	.suspend =	snd_us122l_suspend,
 	.resume =	snd_us122l_resume,
 	.reset_resume =	snd_us122l_resume,
 	.id_table =	snd_us122l_usb_id_table,
 	.supports_autosuspend = 1
 };

 module_usb_driver(snd_us122l_usb_driver);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
	*/

	#include <linux/slab.h>
	#include <linux/usb.h>
	#include <linux/usb/audio.h>
	#include <linux/module.h>
	#include <sound/core.h>
	#include <sound/hwdep.h>
	#include <sound/pcm.h>
	#include <sound/initval.h>
	#define MODNAME "US122L"
	#include "usb_stream.c"
	#include "../usbaudio.h"
	#include "../midi.h"
	#include "us122l.h"

	MODULE_AUTHOR("Karsten Wiese <fzu@wemgehoertderstaat.de>");
	MODULE_DESCRIPTION("TASCAM "NAME_ALLCAPS" Version 0.5");
	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 */
	/* Enable this card */
	static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

	module_param_array(index, int, NULL, 0444);
	MODULE_PARM_DESC(index, "Index value for "NAME_ALLCAPS".");
	module_param_array(id, charp, NULL, 0444);
	MODULE_PARM_DESC(id, "ID string for "NAME_ALLCAPS".");
	module_param_array(enable, bool, NULL, 0444);
	MODULE_PARM_DESC(enable, "Enable "NAME_ALLCAPS".");

	/* driver_info flags */
	#define US122L_FLAG_US144 BIT(0)

	static int snd_us122l_card_used[SNDRV_CARDS];

	static int us122l_create_usbmidi(struct snd_card *card)
	{
	static struct snd_usb_midi_endpoint_info quirk_data = {
	.out_ep = 4,
	.in_ep = 3,
	.out_cables = 0x001,
	.in_cables = 0x001
	};
	static struct snd_usb_audio_quirk quirk = {
	.vendor_name = "US122L",
	.product_name = NAME_ALLCAPS,
	.ifnum = 1,
	.type = QUIRK_MIDI_US122L,
	.data = &quirk_data
	};
	struct usb_device *dev = US122L(card)->dev;
	struct usb_interface *iface = usb_ifnum_to_if(dev, 1);

	return snd_usbmidi_create(card, iface,
	&US122L(card)->midi_list, &quirk);
	}

	static int us144_create_usbmidi(struct snd_card *card)
	{
	static struct snd_usb_midi_endpoint_info quirk_data = {
	.out_ep = 4,
	.in_ep = 3,
	.out_cables = 0x001,
	.in_cables = 0x001
	};
	static struct snd_usb_audio_quirk quirk = {
	.vendor_name = "US144",
	.product_name = NAME_ALLCAPS,
	.ifnum = 0,
	.type = QUIRK_MIDI_US122L,
	.data = &quirk_data
	};
	struct usb_device *dev = US122L(card)->dev;
	struct usb_interface *iface = usb_ifnum_to_if(dev, 0);

	return snd_usbmidi_create(card, iface,
	&US122L(card)->midi_list, &quirk);
	}

	/*
	* Wrapper for usb_control_msg().
	* Allocates a temp buffer to prevent dmaing from/to the stack.
	*/
	static int us122l_ctl_msg(struct usb_device *dev, unsigned int pipe,
	__u8 request, __u8 requesttype,
	__u16 value, __u16 index, void *data,
	__u16 size, int timeout)
	{
	int err;
	void *buf = NULL;

	if (size > 0) {
	buf = kmemdup(data, size, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;
	}
	err = usb_control_msg(dev, pipe, request, requesttype,
	value, index, buf, size, timeout);
	if (size > 0) {
	memcpy(data, buf, size);
	kfree(buf);
	}
	return err;
	}

	static void pt_info_set(struct usb_device *dev, u8 v)
	{
	int ret;

	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	'I',
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	v, 0, NULL, 0, 1000);
	snd_printdd(KERN_DEBUG "%i\n", ret);
	}

	static void usb_stream_hwdep_vm_open(struct vm_area_struct *area)
	{
	struct us122l *us122l = area->vm_private_data;
	atomic_inc(&us122l->mmap_count);
	snd_printdd(KERN_DEBUG "%i\n", atomic_read(&us122l->mmap_count));
	}

	static vm_fault_t usb_stream_hwdep_vm_fault(struct vm_fault *vmf)
	{
	unsigned long offset;
	struct page *page;
	void *vaddr;
	struct us122l *us122l = vmf->vma->vm_private_data;
	struct usb_stream *s;

	mutex_lock(&us122l->mutex);
	s = us122l->sk.s;
	if (!s)
	goto unlock;

	offset = vmf->pgoff << PAGE_SHIFT;
	if (offset < PAGE_ALIGN(s->read_size))
	vaddr = (char *)s + offset;
	else {
	offset -= PAGE_ALIGN(s->read_size);
	if (offset >= PAGE_ALIGN(s->write_size))
	goto unlock;

	vaddr = us122l->sk.write_page + offset;
	}
	page = virt_to_page(vaddr);

	get_page(page);
	mutex_unlock(&us122l->mutex);

	vmf->page = page;

	return 0;
	unlock:
	mutex_unlock(&us122l->mutex);
	return VM_FAULT_SIGBUS;
	}

	static void usb_stream_hwdep_vm_close(struct vm_area_struct *area)
	{
	struct us122l *us122l = area->vm_private_data;
	atomic_dec(&us122l->mmap_count);
	snd_printdd(KERN_DEBUG "%i\n", atomic_read(&us122l->mmap_count));
	}

	static const struct vm_operations_struct usb_stream_hwdep_vm_ops = {
	.open = usb_stream_hwdep_vm_open,
	.fault = usb_stream_hwdep_vm_fault,
	.close = usb_stream_hwdep_vm_close,
	};


	static int usb_stream_hwdep_open(struct snd_hwdep hw, struct file file)
	{
	struct us122l *us122l = hw->private_data;
	struct usb_interface *iface;
	snd_printdd(KERN_DEBUG "%p %p\n", hw, file);
	if (hw->used >= 2)
	return -EBUSY;

	if (!us122l->first)
	us122l->first = file;

	if (us122l->is_us144) {
	iface = usb_ifnum_to_if(us122l->dev, 0);
	usb_autopm_get_interface(iface);
	}
	iface = usb_ifnum_to_if(us122l->dev, 1);
	usb_autopm_get_interface(iface);
	return 0;
	}

	static int usb_stream_hwdep_release(struct snd_hwdep hw, struct file file)
	{
	struct us122l *us122l = hw->private_data;
	struct usb_interface *iface;
	snd_printdd(KERN_DEBUG "%p %p\n", hw, file);

	if (us122l->is_us144) {
	iface = usb_ifnum_to_if(us122l->dev, 0);
	usb_autopm_put_interface(iface);
	}
	iface = usb_ifnum_to_if(us122l->dev, 1);
	usb_autopm_put_interface(iface);
	if (us122l->first == file)
	us122l->first = NULL;
	mutex_lock(&us122l->mutex);
	if (us122l->master == file)
	us122l->master = us122l->slave;

	us122l->slave = NULL;
	mutex_unlock(&us122l->mutex);
	return 0;
	}

	static int usb_stream_hwdep_mmap(struct snd_hwdep *hw,
	struct file filp, struct vm_area_struct area)
	{
	unsigned long size = area->vm_end - area->vm_start;
	struct us122l *us122l = hw->private_data;
	unsigned long offset;
	struct usb_stream *s;
	int err = 0;
	bool read;

	offset = area->vm_pgoff << PAGE_SHIFT;
	mutex_lock(&us122l->mutex);
	s = us122l->sk.s;
	read = offset < s->read_size;
	if (read && area->vm_flags & VM_WRITE) {
	err = -EPERM;
	goto out;
	}
	snd_printdd(KERN_DEBUG "%lu %u\n", size,
	read ? s->read_size : s->write_size);
	/* if userspace tries to mmap beyond end of our buffer, fail */
	if (size > PAGE_ALIGN(read ? s->read_size : s->write_size)) {
	snd_printk(KERN_WARNING "%lu > %u\n", size,
	read ? s->read_size : s->write_size);
	err = -EINVAL;
	goto out;
	}

	area->vm_ops = &usb_stream_hwdep_vm_ops;
	area->vm_flags \|= VM_DONTDUMP;
	if (!read)
	area->vm_flags \|= VM_DONTEXPAND;
	area->vm_private_data = us122l;
	atomic_inc(&us122l->mmap_count);
	out:
	mutex_unlock(&us122l->mutex);
	return err;
	}

	static __poll_t usb_stream_hwdep_poll(struct snd_hwdep *hw,
	struct file file, poll_table wait)
	{
	struct us122l *us122l = hw->private_data;
	unsigned *polled;
	__poll_t mask;

	poll_wait(file, &us122l->sk.sleep, wait);

	mask = EPOLLIN \| EPOLLOUT \| EPOLLWRNORM \| EPOLLERR;
	if (mutex_trylock(&us122l->mutex)) {
	struct usb_stream *s = us122l->sk.s;
	if (s && s->state == usb_stream_ready) {
	if (us122l->first == file)
	polled = &s->periods_polled;
	else
	polled = &us122l->second_periods_polled;
	if (*polled != s->periods_done) {
	*polled = s->periods_done;
	mask = EPOLLIN \| EPOLLOUT \| EPOLLWRNORM;
	} else
	mask = 0;
	}
	mutex_unlock(&us122l->mutex);
	}
	return mask;
	}

	static void us122l_stop(struct us122l *us122l)
	{
	struct list_head *p;
	list_for_each(p, &us122l->midi_list)
	snd_usbmidi_input_stop(p);

	usb_stream_stop(&us122l->sk);
	usb_stream_free(&us122l->sk);
	}

	static int us122l_set_sample_rate(struct usb_device *dev, int rate)
	{
	unsigned int ep = 0x81;
	unsigned char data[3];
	int err;

	data[0] = rate;
	data[1] = rate >> 8;
	data[2] = rate >> 16;
	err = us122l_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
	USB_TYPE_CLASS\|USB_RECIP_ENDPOINT\|USB_DIR_OUT,
	UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000);
	if (err < 0)
	snd_printk(KERN_ERR "%d: cannot set freq %d to ep 0x%x\n",
	dev->devnum, rate, ep);
	return err;
	}

	static bool us122l_start(struct us122l *us122l,
	unsigned rate, unsigned period_frames)
	{
	struct list_head *p;
	int err;
	unsigned use_packsize = 0;
	bool success = false;

	if (us122l->dev->speed == USB_SPEED_HIGH) {
	/* The us-122l's descriptor defaults to iso max_packsize 78,
	which isn't needed for samplerates <= 48000.
	Lets save some memory:
	*/
	switch (rate) {
	case 44100:
	use_packsize = 36;
	break;
	case 48000:
	use_packsize = 42;
	break;
	case 88200:
	use_packsize = 72;
	break;
	}
	}
	if (!usb_stream_new(&us122l->sk, us122l->dev, 1, 2,
	rate, use_packsize, period_frames, 6))
	goto out;

	err = us122l_set_sample_rate(us122l->dev, rate);
	if (err < 0) {
	us122l_stop(us122l);
	snd_printk(KERN_ERR "us122l_set_sample_rate error \n");
	goto out;
	}
	err = usb_stream_start(&us122l->sk);
	if (err < 0) {
	us122l_stop(us122l);
	snd_printk(KERN_ERR "us122l_start error %i \n", err);
	goto out;
	}
	list_for_each(p, &us122l->midi_list)
	snd_usbmidi_input_start(p);
	success = true;
	out:
	return success;
	}

	static int usb_stream_hwdep_ioctl(struct snd_hwdep hw, struct file file,
	unsigned cmd, unsigned long arg)
	{
	struct usb_stream_config cfg;
	struct us122l *us122l = hw->private_data;
	struct usb_stream *s;
	unsigned min_period_frames;
	int err = 0;
	bool high_speed;

	if (cmd != SNDRV_USB_STREAM_IOCTL_SET_PARAMS)
	return -ENOTTY;

	if (copy_from_user(&cfg, (void __user *)arg, sizeof(cfg)))
	return -EFAULT;

	if (cfg.version != USB_STREAM_INTERFACE_VERSION)
	return -ENXIO;

	high_speed = us122l->dev->speed == USB_SPEED_HIGH;
	if ((cfg.sample_rate != 44100 && cfg.sample_rate != 48000 &&
	(!high_speed \|\|
	(cfg.sample_rate != 88200 && cfg.sample_rate != 96000))) \|\|
	cfg.frame_size != 6 \|\|
	cfg.period_frames > 0x3000)
	return -EINVAL;

	switch (cfg.sample_rate) {
	case 44100:
	min_period_frames = 48;
	break;
	case 48000:
	min_period_frames = 52;
	break;
	default:
	min_period_frames = 104;
	break;
	}
	if (!high_speed)
	min_period_frames <<= 1;
	if (cfg.period_frames < min_period_frames)
	return -EINVAL;

	snd_power_wait(hw->card, SNDRV_CTL_POWER_D0);

	mutex_lock(&us122l->mutex);
	s = us122l->sk.s;
	if (!us122l->master)
	us122l->master = file;
	else if (us122l->master != file) {
	if (!s \|\| memcmp(&cfg, &s->cfg, sizeof(cfg))) {
	err = -EIO;
	goto unlock;
	}
	us122l->slave = file;
	}
	if (!s \|\| memcmp(&cfg, &s->cfg, sizeof(cfg)) \|\|
	s->state == usb_stream_xrun) {
	us122l_stop(us122l);
	if (!us122l_start(us122l, cfg.sample_rate, cfg.period_frames))
	err = -EIO;
	else
	err = 1;
	}
	unlock:
	mutex_unlock(&us122l->mutex);
	wake_up_all(&us122l->sk.sleep);
	return err;
	}

	#define SND_USB_STREAM_ID "USB STREAM"
	static int usb_stream_hwdep_new(struct snd_card *card)
	{
	int err;
	struct snd_hwdep *hw;
	struct usb_device *dev = US122L(card)->dev;

	err = snd_hwdep_new(card, SND_USB_STREAM_ID, 0, &hw);
	if (err < 0)
	return err;

	hw->iface = SNDRV_HWDEP_IFACE_USB_STREAM;
	hw->private_data = US122L(card);
	hw->ops.open = usb_stream_hwdep_open;
	hw->ops.release = usb_stream_hwdep_release;
	hw->ops.ioctl = usb_stream_hwdep_ioctl;
	hw->ops.ioctl_compat = usb_stream_hwdep_ioctl;
	hw->ops.mmap = usb_stream_hwdep_mmap;
	hw->ops.poll = usb_stream_hwdep_poll;

	sprintf(hw->name, "/dev/bus/usb/%03d/%03d/hwdeppcm",
	dev->bus->busnum, dev->devnum);
	return 0;
	}


	static bool us122l_create_card(struct snd_card *card)
	{
	int err;
	struct us122l *us122l = US122L(card);

	if (us122l->is_us144) {
	err = usb_set_interface(us122l->dev, 0, 1);
	if (err) {
	snd_printk(KERN_ERR "usb_set_interface error \n");
	return false;
	}
	}
	err = usb_set_interface(us122l->dev, 1, 1);
	if (err) {
	snd_printk(KERN_ERR "usb_set_interface error \n");
	return false;
	}

	pt_info_set(us122l->dev, 0x11);
	pt_info_set(us122l->dev, 0x10);

	if (!us122l_start(us122l, 44100, 256))
	return false;

	if (us122l->is_us144)
	err = us144_create_usbmidi(card);
	else
	err = us122l_create_usbmidi(card);
	if (err < 0) {
	snd_printk(KERN_ERR "us122l_create_usbmidi error %i \n", err);
	goto stop;
	}
	err = usb_stream_hwdep_new(card);
	if (err < 0) {
	/* release the midi resources */
	struct list_head *p;
	list_for_each(p, &us122l->midi_list)
	snd_usbmidi_disconnect(p);

	goto stop;
	}
	return true;

	stop:
	us122l_stop(us122l);
	return false;
	}

	static void snd_us122l_free(struct snd_card *card)
	{
	struct us122l *us122l = US122L(card);
	int index = us122l->card_index;
	if (index >= 0 && index < SNDRV_CARDS)
	snd_us122l_card_used[index] = 0;
	}

	static int usx2y_create_card(struct usb_device *device,
	struct usb_interface *intf,
	struct snd_card **cardp,
	unsigned long flags)
	{
	int dev;
	struct snd_card *card;
	int err;

	for (dev = 0; dev < SNDRV_CARDS; ++dev)
	if (enable[dev] && !snd_us122l_card_used[dev])
	break;
	if (dev >= SNDRV_CARDS)
	return -ENODEV;
	err = snd_card_new(&intf->dev, index[dev], id[dev], THIS_MODULE,
	sizeof(struct us122l), &card);
	if (err < 0)
	return err;
	snd_us122l_card_used[US122L(card)->card_index = dev] = 1;
	card->private_free = snd_us122l_free;
	US122L(card)->dev = device;
	mutex_init(&US122L(card)->mutex);
	init_waitqueue_head(&US122L(card)->sk.sleep);
	US122L(card)->is_us144 = flags & US122L_FLAG_US144;
	INIT_LIST_HEAD(&US122L(card)->midi_list);
	strcpy(card->driver, "USB "NAME_ALLCAPS"");
	sprintf(card->shortname, "TASCAM "NAME_ALLCAPS"");
	sprintf(card->longname, "%s (%x:%x if %d at %03d/%03d)",
	card->shortname,
	le16_to_cpu(device->descriptor.idVendor),
	le16_to_cpu(device->descriptor.idProduct),
	0,
	US122L(card)->dev->bus->busnum,
	US122L(card)->dev->devnum
	);
	*cardp = card;
	return 0;
	}

	static int us122l_usb_probe(struct usb_interface *intf,
	const struct usb_device_id *device_id,
	struct snd_card **cardp)
	{
	struct usb_device *device = interface_to_usbdev(intf);
	struct snd_card *card;
	int err;

	err = usx2y_create_card(device, intf, &card, device_id->driver_info);
	if (err < 0)
	return err;

	if (!us122l_create_card(card)) {
	snd_card_free(card);
	return -EINVAL;
	}

	err = snd_card_register(card);
	if (err < 0) {
	snd_card_free(card);
	return err;
	}

	usb_get_intf(usb_ifnum_to_if(device, 0));
	usb_get_dev(device);
	*cardp = card;
	return 0;
	}

	static int snd_us122l_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	struct usb_device *device = interface_to_usbdev(intf);
	struct snd_card *card;
	int err;

	if (id->driver_info & US122L_FLAG_US144 &&
	device->speed == USB_SPEED_HIGH) {
	snd_printk(KERN_ERR "disable ehci-hcd to run US-144 \n");
	return -ENODEV;
	}

	snd_printdd(KERN_DEBUG"%p:%i\n",
	intf, intf->cur_altsetting->desc.bInterfaceNumber);
	if (intf->cur_altsetting->desc.bInterfaceNumber != 1)
	return 0;

	err = us122l_usb_probe(usb_get_intf(intf), id, &card);
	if (err < 0) {
	usb_put_intf(intf);
	return err;
	}

	usb_set_intfdata(intf, card);
	return 0;
	}

	static void snd_us122l_disconnect(struct usb_interface *intf)
	{
	struct snd_card *card;
	struct us122l *us122l;
	struct list_head *p;

	card = usb_get_intfdata(intf);
	if (!card)
	return;

	snd_card_disconnect(card);

	us122l = US122L(card);
	mutex_lock(&us122l->mutex);
	us122l_stop(us122l);
	mutex_unlock(&us122l->mutex);

	/* release the midi resources */
	list_for_each(p, &us122l->midi_list) {
	snd_usbmidi_disconnect(p);
	}

	usb_put_intf(usb_ifnum_to_if(us122l->dev, 0));
	usb_put_intf(usb_ifnum_to_if(us122l->dev, 1));
	usb_put_dev(us122l->dev);

	while (atomic_read(&us122l->mmap_count))
	msleep(500);

	snd_card_free(card);
	}

	static int snd_us122l_suspend(struct usb_interface *intf, pm_message_t message)
	{
	struct snd_card *card;
	struct us122l *us122l;
	struct list_head *p;

	card = usb_get_intfdata(intf);
	if (!card)
	return 0;
	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

	us122l = US122L(card);
	if (!us122l)
	return 0;

	list_for_each(p, &us122l->midi_list)
	snd_usbmidi_input_stop(p);

	mutex_lock(&us122l->mutex);
	usb_stream_stop(&us122l->sk);
	mutex_unlock(&us122l->mutex);

	return 0;
	}

	static int snd_us122l_resume(struct usb_interface *intf)
	{
	struct snd_card *card;
	struct us122l *us122l;
	struct list_head *p;
	int err;

	card = usb_get_intfdata(intf);
	if (!card)
	return 0;

	us122l = US122L(card);
	if (!us122l)
	return 0;

	mutex_lock(&us122l->mutex);
	/* needed, doesn't restart without: */
	if (us122l->is_us144) {
	err = usb_set_interface(us122l->dev, 0, 1);
	if (err) {
	snd_printk(KERN_ERR "usb_set_interface error \n");
	goto unlock;
	}
	}
	err = usb_set_interface(us122l->dev, 1, 1);
	if (err) {
	snd_printk(KERN_ERR "usb_set_interface error \n");
	goto unlock;
	}

	pt_info_set(us122l->dev, 0x11);
	pt_info_set(us122l->dev, 0x10);

	err = us122l_set_sample_rate(us122l->dev,
	us122l->sk.s->cfg.sample_rate);
	if (err < 0) {
	snd_printk(KERN_ERR "us122l_set_sample_rate error \n");
	goto unlock;
	}
	err = usb_stream_start(&us122l->sk);
	if (err)
	goto unlock;

	list_for_each(p, &us122l->midi_list)
	snd_usbmidi_input_start(p);
	unlock:
	mutex_unlock(&us122l->mutex);
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return err;
	}

	static const struct usb_device_id snd_us122l_usb_id_table[] = {
	{
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x0644,
	.idProduct = USB_ID_US122L
	},
	{ /* US-144 only works at USB1.1! Disable module ehci-hcd. */
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x0644,
	.idProduct = USB_ID_US144,
	.driver_info = US122L_FLAG_US144
	},
	{
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x0644,
	.idProduct = USB_ID_US122MKII
	},
	{
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE,
	.idVendor = 0x0644,
	.idProduct = USB_ID_US144MKII,
	.driver_info = US122L_FLAG_US144
	},
	{ /* terminator */ }
	};

	MODULE_DEVICE_TABLE(usb, snd_us122l_usb_id_table);
	static struct usb_driver snd_us122l_usb_driver = {
	.name = "snd-usb-us122l",
	.probe = snd_us122l_probe,
	.disconnect = snd_us122l_disconnect,
	.suspend = snd_us122l_suspend,
	.resume = snd_us122l_resume,
	.reset_resume = snd_us122l_resume,
	.id_table = snd_us122l_usb_id_table,
	.supports_autosuspend = 1
	};

	module_usb_driver(snd_us122l_usb_driver);