us122l.c

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/*
 * Copyright (C) 2007, 2008 Karsten Wiese <[email protected]>
 *
 * 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 <[email protected]>");
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\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_DONTEXPAND | VM_DONTDUMP;
    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\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;

    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 \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
};

module_usb_driver(snd_us122l_usb_driver);