linux-stable/sound/usb/line6/driver.c
Takashi Iwai d683469b3c ALSA: line6: Fix endless MIDI read loop
The MIDI input event parser of the LINE6 driver may enter into an
endless loop when the unexpected data sequence is given, as it tries
to continue the secondary bytes without termination.  Also, when the
input data is too short, the parser returns a negative error, while
the caller doesn't handle it properly.  This would lead to the
unexpected behavior as well.

This patch addresses those issues by checking the return value
correctly and handling the one-byte event in the parser properly.

The bug was reported by syzkaller.

Reported-by: syzbot+cce32521ee0a824c21f7@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000033087059f8f8fa3@google.com
Link: https://lore.kernel.org/r/20200309095922.30269-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-03-09 11:00:45 +01:00

886 lines
21 KiB
C

// 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.
*/
static 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 * HZ);
} else {
retval = usb_bulk_msg(line6->usbdev,
usb_sndbulkpipe(line6->usbdev, properties->ep_ctrl_w),
(char *)frag_buf, frag_size,
&partial, LINE6_TIMEOUT * HZ);
}
if (retval) {
dev_err(line6->ifcdev,
"usb_bulk_msg failed (%d)\n", retval);
break;
}
done += frag_size;
}
return done;
}
/*
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);
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;
unsigned char *len;
unsigned count;
if (address > 0xffff || datalen > 0xff)
return -EINVAL;
len = kmalloc(1, GFP_KERNEL);
if (!len)
return -ENOMEM;
/* query the serial number: */
ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
(datalen << 8) | 0x21, address,
NULL, 0, LINE6_TIMEOUT * HZ);
if (ret < 0) {
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(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE |
USB_DIR_IN,
0x0012, 0x0000, len, 1,
LINE6_TIMEOUT * HZ);
if (ret < 0) {
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, (int)*len);
goto exit;
}
/* receive the result: */
ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x0013, 0x0000, data, datalen,
LINE6_TIMEOUT * HZ);
if (ret < 0)
dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
exit:
kfree(len);
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(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x0022, address, data, datalen,
LINE6_TIMEOUT * HZ);
if (ret < 0) {
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(usbdev, usb_rcvctrlpipe(usbdev, 0),
0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE |
USB_DIR_IN,
0x0012, 0x0000,
status, 1, LINE6_TIMEOUT * HZ);
if (ret < 0) {
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;
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);
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 const struct snd_hwdep_ops hwdep_ops = {
.open = line6_hwdep_open,
.release = line6_hwdep_release,
.read = line6_hwdep_read,
.write = line6_hwdep_write,
};
/* 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;
} 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(&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");