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us122l.c

/*
 * 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 <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 int 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\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 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\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->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\n", 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\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_RESERVED;
      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;
      struct usb_stream *s = us122l->sk.s;
      unsigned    *polled;
      unsigned int      mask;

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

      switch (s->state) {
      case 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;
                  break;
            }
            /* Fall through */
            mask = 0;
            break;
      default:
            mask = POLLIN | POLLOUT | POLLWRNORM | POLLERR;
            break;
      }
      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;
      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);
      if (!us122l->master)
            us122l->master = file;
      else if (us122l->master != file) {
            if (memcmp(cfg, &us122l->sk.s->cfg, sizeof(*cfg))) {
                  err = -EIO;
                  goto unlock;
            }
            us122l->slave = file;
      }
      if (!us122l->sk.s ||
          memcmp(cfg, &us122l->sk.s->cfg, sizeof(*cfg)) ||
          us122l->sk.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);
      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 \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->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 \n", 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 \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->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 \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 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
};


static int __init snd_us122l_module_init(void)
{
      return usb_register(&snd_us122l_usb_driver);
}

static void __exit snd_us122l_module_exit(void)
{
      usb_deregister(&snd_us122l_usb_driver);
}

module_init(snd_us122l_module_init)
module_exit(snd_us122l_module_exit)

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