/*
   * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
   *
   * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #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".");
  
  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
  ", 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
  ", atomic_read(&us122l->mmap_count));
  }
  
  static int usb_stream_hwdep_vm_fault(struct vm_area_struct *area,
  				     struct vm_fault *vmf)
  {
  	unsigned long offset;
  	struct page *page;
  	void *vaddr;
  	struct us122l *us122l = area->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
  ", 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
  ", hw, file);
  	if (hw->used >= 2)
  		return -EBUSY;
  
  	if (!us122l->first)
  		us122l->first = file;
  
  	if (us122l->dev->descriptor.idProduct == USB_ID_US144 ||
  	    us122l->dev->descriptor.idProduct == USB_ID_US144MKII) {
  		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
  ", hw, file);
  
  	if (us122l->dev->descriptor.idProduct == USB_ID_US144 ||
  	    us122l->dev->descriptor.idProduct == USB_ID_US144MKII) {
  		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
  ", 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
  ", 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 unsigned int usb_stream_hwdep_poll(struct snd_hwdep *hw,
  					  struct file *file, poll_table *wait)
  {
  	struct us122l	*us122l = hw->private_data;
  	unsigned	*polled;
  	unsigned int	mask;
  
  	poll_wait(file, &us122l->sk.sleep, wait);
  
  	mask = POLLIN | POLLOUT | POLLWRNORM | POLLERR;
  	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 = POLLIN | POLLOUT | POLLWRNORM;
  			} 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
  ",
  			   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 
  ");
  		goto out;
  	}
  	err = usb_stream_start(&us122l->sk);
  	if (err < 0) {
  		us122l_stop(us122l);
  		snd_printk(KERN_ERR "us122l_start error %i 
  ", 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;
  
  	cfg = memdup_user((void *)arg, sizeof(*cfg));
  	if (IS_ERR(cfg))
  		return PTR_ERR(cfg);
  
  	if (cfg->version != USB_STREAM_INTERFACE_VERSION) {
  		err = -ENXIO;
  		goto free;
  	}
  	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) {
  		err = -EINVAL;
  		goto free;
  	}
  	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) {
  		err = -EINVAL;
  		goto free;
  	}
  
  	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);
  free:
  	kfree(cfg);
  	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, "/proc/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->dev->descriptor.idProduct == USB_ID_US144 ||
  	    us122l->dev->descriptor.idProduct == USB_ID_US144MKII) {
  		err = usb_set_interface(us122l->dev, 0, 1);
  		if (err) {
  			snd_printk(KERN_ERR "usb_set_interface error 
  ");
  			return false;
  		}
  	}
  	err = usb_set_interface(us122l->dev, 1, 1);
  	if (err) {
  		snd_printk(KERN_ERR "usb_set_interface error 
  ");
  		return false;
  	}
  
  	pt_info_set(us122l->dev, 0x11);
  	pt_info_set(us122l->dev, 0x10);
  
  	if (!us122l_start(us122l, 44100, 256))
  		return false;
  
  	if (us122l->dev->descriptor.idProduct == USB_ID_US144 ||
  	    us122l->dev->descriptor.idProduct == USB_ID_US144MKII)
  		err = us144_create_usbmidi(card);
  	else
  		err = us122l_create_usbmidi(card);
  	if (err < 0) {
  		snd_printk(KERN_ERR "us122l_create_usbmidi error %i 
  ", err);
  		us122l_stop(us122l);
  		return false;
  	}
  	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);
  
  		us122l_stop(us122l);
  		return false;
  	}
  	return true;
  }
  
  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 snd_card **cardp)
  {
  	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_create(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);
  	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, &card);
  	if (err < 0)
  		return err;
  
  	snd_card_set_dev(card, &intf->dev);
  	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 ((device->descriptor.idProduct == USB_ID_US144 ||
  	     device->descriptor.idProduct == USB_ID_US144MKII)
  		&& device->speed == USB_SPEED_HIGH) {
  		snd_printk(KERN_ERR "disable ehci-hcd to run US-144 
  ");
  		return -ENODEV;
  	}
  
  	snd_printdd(KERN_DEBUG"%p:%i
  ",
  		    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->dev->descriptor.idProduct == USB_ID_US144 ||
  	    us122l->dev->descriptor.idProduct == USB_ID_US144MKII) {
  		err = usb_set_interface(us122l->dev, 0, 1);
  		if (err) {
  			snd_printk(KERN_ERR "usb_set_interface error 
  ");
  			goto unlock;
  		}
  	}
  	err = usb_set_interface(us122l->dev, 1, 1);
  	if (err) {
  		snd_printk(KERN_ERR "usb_set_interface error 
  ");
  		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 
  ");
  		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 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
  	},
  	{
  		.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
  	},
  	{ /* 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);