blob: b67617b68e509d2c86d78058f7796a64aab00f41 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Line 6 Linux USB driver
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/hwdep.h>
#include "capture.h"
#include "driver.h"
#include "midi.h"
#include "playback.h"
#define DRIVER_AUTHOR "Markus Grabner <grabner@icg.tugraz.at>"
#define DRIVER_DESC "Line 6 USB Driver"
/*
This is Line 6's MIDI manufacturer ID.
*/
const unsigned char line6_midi_id[3] = {
0x00, 0x01, 0x0c
};
EXPORT_SYMBOL_GPL(line6_midi_id);
/*
Code to request version of POD, Variax interface
(and maybe other devices).
*/
static const char line6_request_version[] = {
0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
};
/*
Class for asynchronous messages.
*/
struct message {
struct usb_line6 *line6;
const char *buffer;
int size;
int done;
};
/*
Forward declarations.
*/
static void line6_data_received(struct urb *urb);
static int line6_send_raw_message_async_part(struct message *msg,
struct urb *urb);
/*
Start to listen on endpoint.
*/
static int line6_start_listen(struct usb_line6 *line6)
{
int err;
if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
usb_fill_int_urb(line6->urb_listen, line6->usbdev,
usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
line6_data_received, line6, line6->interval);
} else {
usb_fill_bulk_urb(line6->urb_listen, line6->usbdev,
usb_rcvbulkpipe(line6->usbdev, line6->properties->ep_ctrl_r),
line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
line6_data_received, line6);
}
/* sanity checks of EP before actually submitting */
if (usb_urb_ep_type_check(line6->urb_listen)) {
dev_err(line6->ifcdev, "invalid control EP\n");
return -EINVAL;
}
line6->urb_listen->actual_length = 0;
err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
return err;
}
/*
Stop listening on endpoint.
*/
static void line6_stop_listen(struct usb_line6 *line6)
{
usb_kill_urb(line6->urb_listen);
}
/*
Send raw message in pieces of wMaxPacketSize bytes.
*/
int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
int size)
{
int i, done = 0;
const struct line6_properties *properties = line6->properties;
for (i = 0; i < size; i += line6->max_packet_size) {
int partial;
const char *frag_buf = buffer + i;
int frag_size = min(line6->max_packet_size, size - i);
int retval;
if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
retval = usb_interrupt_msg(line6->usbdev,
usb_sndintpipe(line6->usbdev, properties->ep_ctrl_w),
(char *)frag_buf, frag_size,
&partial, LINE6_TIMEOUT);
} else {
retval = usb_bulk_msg(line6->usbdev,
usb_sndbulkpipe(line6->usbdev, properties->ep_ctrl_w),
(char *)frag_buf, frag_size,
&partial, LINE6_TIMEOUT);
}
if (retval) {
dev_err(line6->ifcdev,
"usb_bulk_msg failed (%d)\n", retval);
break;
}
done += frag_size;
}
return done;
}
EXPORT_SYMBOL_GPL(line6_send_raw_message);
/*
Notification of completion of asynchronous request transmission.
*/
static void line6_async_request_sent(struct urb *urb)
{
struct message *msg = (struct message *)urb->context;
if (msg->done >= msg->size) {
usb_free_urb(urb);
kfree(msg);
} else
line6_send_raw_message_async_part(msg, urb);
}
/*
Asynchronously send part of a raw message.
*/
static int line6_send_raw_message_async_part(struct message *msg,
struct urb *urb)
{
int retval;
struct usb_line6 *line6 = msg->line6;
int done = msg->done;
int bytes = min(msg->size - done, line6->max_packet_size);
if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
usb_fill_int_urb(urb, line6->usbdev,
usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
(char *)msg->buffer + done, bytes,
line6_async_request_sent, msg, line6->interval);
} else {
usb_fill_bulk_urb(urb, line6->usbdev,
usb_sndbulkpipe(line6->usbdev, line6->properties->ep_ctrl_w),
(char *)msg->buffer + done, bytes,
line6_async_request_sent, msg);
}
msg->done += bytes;
/* sanity checks of EP before actually submitting */
retval = usb_urb_ep_type_check(urb);
if (retval < 0)
goto error;
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval < 0)
goto error;
return 0;
error:
dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
__func__, retval);
usb_free_urb(urb);
kfree(msg);
return retval;
}
/*
Asynchronously send raw message.
*/
int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
int size)
{
struct message *msg;
struct urb *urb;
/* create message: */
msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
if (msg == NULL)
return -ENOMEM;
/* create URB: */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (urb == NULL) {
kfree(msg);
return -ENOMEM;
}
/* set message data: */
msg->line6 = line6;
msg->buffer = buffer;
msg->size = size;
msg->done = 0;
/* start sending: */
return line6_send_raw_message_async_part(msg, urb);
}
EXPORT_SYMBOL_GPL(line6_send_raw_message_async);
/*
Send asynchronous device version request.
*/
int line6_version_request_async(struct usb_line6 *line6)
{
char *buffer;
int retval;
buffer = kmemdup(line6_request_version,
sizeof(line6_request_version), GFP_ATOMIC);
if (buffer == NULL)
return -ENOMEM;
retval = line6_send_raw_message_async(line6, buffer,
sizeof(line6_request_version));
kfree(buffer);
return retval;
}
EXPORT_SYMBOL_GPL(line6_version_request_async);
/*
Send sysex message in pieces of wMaxPacketSize bytes.
*/
int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
int size)
{
return line6_send_raw_message(line6, buffer,
size + SYSEX_EXTRA_SIZE) -
SYSEX_EXTRA_SIZE;
}
EXPORT_SYMBOL_GPL(line6_send_sysex_message);
/*
Allocate buffer for sysex message and prepare header.
@param code sysex message code
@param size number of bytes between code and sysex end
*/
char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
int size)
{
char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);
if (!buffer)
return NULL;
buffer[0] = LINE6_SYSEX_BEGIN;
memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
buffer[sizeof(line6_midi_id) + 1] = code1;
buffer[sizeof(line6_midi_id) + 2] = code2;
buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
return buffer;
}
EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);
/*
Notification of data received from the Line 6 device.
*/
static void line6_data_received(struct urb *urb)
{
struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
struct midi_buffer *mb = &line6->line6midi->midibuf_in;
int done;
if (urb->status == -ESHUTDOWN)
return;
if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
done =
line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);
if (done < urb->actual_length) {
line6_midibuf_ignore(mb, done);
dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
done, urb->actual_length);
}
for (;;) {
done =
line6_midibuf_read(mb, line6->buffer_message,
LINE6_MIDI_MESSAGE_MAXLEN,
LINE6_MIDIBUF_READ_RX);
if (done <= 0)
break;
line6->message_length = done;
line6_midi_receive(line6, line6->buffer_message, done);
if (line6->process_message)
line6->process_message(line6);
}
} else {
line6->buffer_message = urb->transfer_buffer;
line6->message_length = urb->actual_length;
if (line6->process_message)
line6->process_message(line6);
line6->buffer_message = NULL;
}
line6_start_listen(line6);
}
#define LINE6_READ_WRITE_STATUS_DELAY 2 /* milliseconds */
#define LINE6_READ_WRITE_MAX_RETRIES 50
/*
Read data from device.
*/
int line6_read_data(struct usb_line6 *line6, unsigned address, void *data,
unsigned datalen)
{
struct usb_device *usbdev = line6->usbdev;
int ret;
u8 len;
unsigned count;
if (address > 0xffff || datalen > 0xff)
return -EINVAL;
/* query the serial number: */
ret = usb_control_msg_send(usbdev, 0, 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
(datalen << 8) | 0x21, address, NULL, 0,
LINE6_TIMEOUT, GFP_KERNEL);
if (ret) {
dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
goto exit;
}
/* Wait for data length. We'll get 0xff until length arrives. */
for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
mdelay(LINE6_READ_WRITE_STATUS_DELAY);
ret = usb_control_msg_recv(usbdev, 0, 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x0012, 0x0000, &len, 1,
LINE6_TIMEOUT, GFP_KERNEL);
if (ret) {
dev_err(line6->ifcdev,
"receive length failed (error %d)\n", ret);
goto exit;
}
if (len != 0xff)
break;
}
ret = -EIO;
if (len == 0xff) {
dev_err(line6->ifcdev, "read failed after %d retries\n",
count);
goto exit;
} else if (len != datalen) {
/* should be equal or something went wrong */
dev_err(line6->ifcdev,
"length mismatch (expected %d, got %d)\n",
(int)datalen, len);
goto exit;
}
/* receive the result: */
ret = usb_control_msg_recv(usbdev, 0, 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x0013, 0x0000, data, datalen, LINE6_TIMEOUT,
GFP_KERNEL);
if (ret)
dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
exit:
return ret;
}
EXPORT_SYMBOL_GPL(line6_read_data);
/*
Write data to device.
*/
int line6_write_data(struct usb_line6 *line6, unsigned address, void *data,
unsigned datalen)
{
struct usb_device *usbdev = line6->usbdev;
int ret;
unsigned char *status;
int count;
if (address > 0xffff || datalen > 0xffff)
return -EINVAL;
status = kmalloc(1, GFP_KERNEL);
if (!status)
return -ENOMEM;
ret = usb_control_msg_send(usbdev, 0, 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x0022, address, data, datalen, LINE6_TIMEOUT,
GFP_KERNEL);
if (ret) {
dev_err(line6->ifcdev,
"write request failed (error %d)\n", ret);
goto exit;
}
for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
mdelay(LINE6_READ_WRITE_STATUS_DELAY);
ret = usb_control_msg_recv(usbdev, 0, 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x0012, 0x0000, status, 1, LINE6_TIMEOUT,
GFP_KERNEL);
if (ret) {
dev_err(line6->ifcdev,
"receiving status failed (error %d)\n", ret);
goto exit;
}
if (*status != 0xff)
break;
}
if (*status == 0xff) {
dev_err(line6->ifcdev, "write failed after %d retries\n",
count);
ret = -EIO;
} else if (*status != 0) {
dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
ret = -EIO;
}
exit:
kfree(status);
return ret;
}
EXPORT_SYMBOL_GPL(line6_write_data);
/*
Read Line 6 device serial number.
(POD, TonePort, GuitarPort)
*/
int line6_read_serial_number(struct usb_line6 *line6, u32 *serial_number)
{
return line6_read_data(line6, 0x80d0, serial_number,
sizeof(*serial_number));
}
EXPORT_SYMBOL_GPL(line6_read_serial_number);
/*
Card destructor.
*/
static void line6_destruct(struct snd_card *card)
{
struct usb_line6 *line6 = card->private_data;
struct usb_device *usbdev = line6->usbdev;
/* Free buffer memory first. We cannot depend on the existence of private
* data from the (podhd) module, it may be gone already during this call
*/
kfree(line6->buffer_message);
kfree(line6->buffer_listen);
/* then free URBs: */
usb_free_urb(line6->urb_listen);
line6->urb_listen = NULL;
/* decrement reference counters: */
usb_put_dev(usbdev);
}
static void line6_get_usb_properties(struct usb_line6 *line6)
{
struct usb_device *usbdev = line6->usbdev;
const struct line6_properties *properties = line6->properties;
int pipe;
struct usb_host_endpoint *ep = NULL;
if (properties->capabilities & LINE6_CAP_CONTROL) {
if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
pipe = usb_rcvintpipe(line6->usbdev,
line6->properties->ep_ctrl_r);
} else {
pipe = usb_rcvbulkpipe(line6->usbdev,
line6->properties->ep_ctrl_r);
}
ep = usbdev->ep_in[usb_pipeendpoint(pipe)];
}
/* Control data transfer properties */
if (ep) {
line6->interval = ep->desc.bInterval;
line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
} else {
if (properties->capabilities & LINE6_CAP_CONTROL) {
dev_err(line6->ifcdev,
"endpoint not available, using fallback values");
}
line6->interval = LINE6_FALLBACK_INTERVAL;
line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
}
/* Isochronous transfer properties */
if (usbdev->speed == USB_SPEED_LOW) {
line6->intervals_per_second = USB_LOW_INTERVALS_PER_SECOND;
line6->iso_buffers = USB_LOW_ISO_BUFFERS;
} else {
line6->intervals_per_second = USB_HIGH_INTERVALS_PER_SECOND;
line6->iso_buffers = USB_HIGH_ISO_BUFFERS;
}
}
/* Enable buffering of incoming messages, flush the buffer */
static int line6_hwdep_open(struct snd_hwdep *hw, struct file *file)
{
struct usb_line6 *line6 = hw->private_data;
/* NOTE: hwdep layer provides atomicity here */
line6->messages.active = 1;
line6->messages.nonblock = file->f_flags & O_NONBLOCK ? 1 : 0;
return 0;
}
/* Stop buffering */
static int line6_hwdep_release(struct snd_hwdep *hw, struct file *file)
{
struct usb_line6 *line6 = hw->private_data;
line6->messages.active = 0;
return 0;
}
/* Read from circular buffer, return to user */
static long
line6_hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct usb_line6 *line6 = hwdep->private_data;
long rv = 0;
unsigned int out_count;
if (mutex_lock_interruptible(&line6->messages.read_lock))
return -ERESTARTSYS;
while (kfifo_len(&line6->messages.fifo) == 0) {
mutex_unlock(&line6->messages.read_lock);
if (line6->messages.nonblock)
return -EAGAIN;
rv = wait_event_interruptible(
line6->messages.wait_queue,
kfifo_len(&line6->messages.fifo) != 0);
if (rv < 0)
return rv;
if (mutex_lock_interruptible(&line6->messages.read_lock))
return -ERESTARTSYS;
}
if (kfifo_peek_len(&line6->messages.fifo) > count) {
/* Buffer too small; allow re-read of the current item... */
rv = -EINVAL;
} else {
rv = kfifo_to_user(&line6->messages.fifo, buf, count, &out_count);
if (rv == 0)
rv = out_count;
}
mutex_unlock(&line6->messages.read_lock);
return rv;
}
/* Write directly (no buffering) to device by user*/
static long
line6_hwdep_write(struct snd_hwdep *hwdep, const char __user *data, long count,
loff_t *offset)
{
struct usb_line6 *line6 = hwdep->private_data;
int rv;
char *data_copy;
if (count > line6->max_packet_size * LINE6_RAW_MESSAGES_MAXCOUNT) {
/* This is an arbitrary limit - still better than nothing... */
return -EINVAL;
}
data_copy = memdup_user(data, count);
if (IS_ERR(data_copy))
return PTR_ERR(data_copy);
rv = line6_send_raw_message(line6, data_copy, count);
kfree(data_copy);
return rv;
}
static __poll_t
line6_hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
{
__poll_t rv;
struct usb_line6 *line6 = hwdep->private_data;
poll_wait(file, &line6->messages.wait_queue, wait);
mutex_lock(&line6->messages.read_lock);
rv = kfifo_len(&line6->messages.fifo) == 0 ? 0 : EPOLLIN | EPOLLRDNORM;
mutex_unlock(&line6->messages.read_lock);
return rv;
}
static const struct snd_hwdep_ops hwdep_ops = {
.open = line6_hwdep_open,
.release = line6_hwdep_release,
.read = line6_hwdep_read,
.write = line6_hwdep_write,
.poll = line6_hwdep_poll,
};
/* Insert into circular buffer */
static void line6_hwdep_push_message(struct usb_line6 *line6)
{
if (!line6->messages.active)
return;
if (kfifo_avail(&line6->messages.fifo) >= line6->message_length) {
/* No race condition here, there's only one writer */
kfifo_in(&line6->messages.fifo,
line6->buffer_message, line6->message_length);
} /* else TODO: signal overflow */
wake_up_interruptible(&line6->messages.wait_queue);
}
static int line6_hwdep_init(struct usb_line6 *line6)
{
int err;
struct snd_hwdep *hwdep;
/* TODO: usb_driver_claim_interface(); */
line6->process_message = line6_hwdep_push_message;
line6->messages.active = 0;
init_waitqueue_head(&line6->messages.wait_queue);
mutex_init(&line6->messages.read_lock);
INIT_KFIFO(line6->messages.fifo);
err = snd_hwdep_new(line6->card, "config", 0, &hwdep);
if (err < 0)
goto end;
strcpy(hwdep->name, "config");
hwdep->iface = SNDRV_HWDEP_IFACE_LINE6;
hwdep->ops = hwdep_ops;
hwdep->private_data = line6;
hwdep->exclusive = true;
end:
return err;
}
static int line6_init_cap_control(struct usb_line6 *line6)
{
int ret;
/* initialize USB buffers: */
line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
if (!line6->buffer_listen)
return -ENOMEM;
line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
if (!line6->urb_listen)
return -ENOMEM;
if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
line6->buffer_message = kmalloc(LINE6_MIDI_MESSAGE_MAXLEN, GFP_KERNEL);
if (!line6->buffer_message)
return -ENOMEM;
ret = line6_init_midi(line6);
if (ret < 0)
return ret;
} else {
ret = line6_hwdep_init(line6);
if (ret < 0)
return ret;
}
ret = line6_start_listen(line6);
if (ret < 0) {
dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
return ret;
}
return 0;
}
static void line6_startup_work(struct work_struct *work)
{
struct usb_line6 *line6 =
container_of(work, struct usb_line6, startup_work.work);
if (line6->startup)
line6->startup(line6);
}
/*
Probe USB device.
*/
int line6_probe(struct usb_interface *interface,
const struct usb_device_id *id,
const char *driver_name,
const struct line6_properties *properties,
int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
size_t data_size)
{
struct usb_device *usbdev = interface_to_usbdev(interface);
struct snd_card *card;
struct usb_line6 *line6;
int interface_number;
int ret;
if (WARN_ON(data_size < sizeof(*line6)))
return -EINVAL;
/* we don't handle multiple configurations */
if (usbdev->descriptor.bNumConfigurations != 1)
return -ENODEV;
ret = snd_card_new(&interface->dev,
SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, data_size, &card);
if (ret < 0)
return ret;
/* store basic data: */
line6 = card->private_data;
line6->card = card;
line6->properties = properties;
line6->usbdev = usbdev;
line6->ifcdev = &interface->dev;
INIT_DELAYED_WORK(&line6->startup_work, line6_startup_work);
strcpy(card->id, properties->id);
strcpy(card->driver, driver_name);
strcpy(card->shortname, properties->name);
sprintf(card->longname, "Line 6 %s at USB %s", properties->name,
dev_name(line6->ifcdev));
card->private_free = line6_destruct;
usb_set_intfdata(interface, line6);
/* increment reference counters: */
usb_get_dev(usbdev);
/* initialize device info: */
dev_info(&interface->dev, "Line 6 %s found\n", properties->name);
/* query interface number */
interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
/* TODO reserves the bus bandwidth even without actual transfer */
ret = usb_set_interface(usbdev, interface_number,
properties->altsetting);
if (ret < 0) {
dev_err(&interface->dev, "set_interface failed\n");
goto error;
}
line6_get_usb_properties(line6);
if (properties->capabilities & LINE6_CAP_CONTROL) {
ret = line6_init_cap_control(line6);
if (ret < 0)
goto error;
}
/* initialize device data based on device: */
ret = private_init(line6, id);
if (ret < 0)
goto error;
/* creation of additional special files should go here */
dev_info(&interface->dev, "Line 6 %s now attached\n",
properties->name);
return 0;
error:
/* we can call disconnect callback here because no close-sync is
* needed yet at this point
*/
line6_disconnect(interface);
return ret;
}
EXPORT_SYMBOL_GPL(line6_probe);
/*
Line 6 device disconnected.
*/
void line6_disconnect(struct usb_interface *interface)
{
struct usb_line6 *line6 = usb_get_intfdata(interface);
struct usb_device *usbdev = interface_to_usbdev(interface);
if (!line6)
return;
if (WARN_ON(usbdev != line6->usbdev))
return;
cancel_delayed_work_sync(&line6->startup_work);
if (line6->urb_listen != NULL)
line6_stop_listen(line6);
snd_card_disconnect(line6->card);
if (line6->line6pcm)
line6_pcm_disconnect(line6->line6pcm);
if (line6->disconnect)
line6->disconnect(line6);
dev_info(&interface->dev, "Line 6 %s now disconnected\n",
line6->properties->name);
/* make sure the device isn't destructed twice: */
usb_set_intfdata(interface, NULL);
snd_card_free_when_closed(line6->card);
}
EXPORT_SYMBOL_GPL(line6_disconnect);
#ifdef CONFIG_PM
/*
Suspend Line 6 device.
*/
int line6_suspend(struct usb_interface *interface, pm_message_t message)
{
struct usb_line6 *line6 = usb_get_intfdata(interface);
struct snd_line6_pcm *line6pcm = line6->line6pcm;
snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);
if (line6->properties->capabilities & LINE6_CAP_CONTROL)
line6_stop_listen(line6);
if (line6pcm != NULL)
line6pcm->flags = 0;
return 0;
}
EXPORT_SYMBOL_GPL(line6_suspend);
/*
Resume Line 6 device.
*/
int line6_resume(struct usb_interface *interface)
{
struct usb_line6 *line6 = usb_get_intfdata(interface);
if (line6->properties->capabilities & LINE6_CAP_CONTROL)
line6_start_listen(line6);
snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
return 0;
}
EXPORT_SYMBOL_GPL(line6_resume);
#endif /* CONFIG_PM */
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");