重启USB

/* usbreset -- send a USB port reset to a USB device */

/*

* Copyright (c) 2014, JSK Robotics Lab, Inc.

* Copyright (c) 2016, Orbbec Ltd.

* All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions are met:

*

* * Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* * Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* * Neither the name of the Willow Garage, Inc. nor the names of its

* contributors may be used to endorse or promote products derived from

* this software without specific prior written permission.

*

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

*

* Author: Tim Liu (liuhua@orbbec.com)

*/

#include <stdio.h>

#include <unistd.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/ioctl.h>

#include <linux/usbdevice_fs.h>

int main(int argc, char **argv)

{

const char *filename;

int fd;

int rc;

if (argc != 2) {

fprintf(stderr, "Usage: usbreset device-filename\n");

return 1;

}

filename = argv[1];

fd = open(filename, O_WRONLY);

if (fd < 0) {

perror("Error opening output file");

return 1;

}

printf("Resetting USB device %s\n", filename);

rc = ioctl(fd, USBDEVFS_RESET, 0);

if (rc < 0) {

perror("Error in ioctl");

return 1;

}

printf("Reset successful\n");

close(fd);

return 0;

}