是否可以重置USB设备的连接，而无需从PC机上断开/连接？
答案1
将以下内容另存为usbreset.c
/* usbreset -- send a USB port reset to a USB device */
#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-filenamen");
return 1;
}
filename = argv[1];
fd = open(filename, O_WRONLY);
if (fd < 0) {
perror("Error opening output file");
return 1;
}
printf("Resetting USB device %sn", filename);
rc = ioctl(fd, USBDEVFS_RESET, 0);
if (rc < 0) {
perror("Error in ioctl");
return 1;
}
printf("Reset successfuln");
close(fd);
return 0;
}
在终端中运行以下命令：
编译程序：
$ cc usbreset.c -o usbreset
获取要重置的USB设备的总线和设备ID：
$ lsusb
Bus 002 Device 003: ID 0fe9:9010 DVICO
使我们编译的程序可执行：
$ chmod +x usbreset
使用sudo权限执行程序；对<Bus>和<Device> id进行必要的替换，方法是运行lsusb命令：
$ sudo ./usbreset /dev/bus/usb/002/003
以上程序的源代码：http://marc.info/?l=linux-usb&m=121459435621262&w=2
答案2
无需外部应用程序
sudo sh -c"echo 0 > /sys/bus/usb/devices/1-4.6/authorized"
sudo sh -c"echo 1 > /sys/bus/usb/devices/1-4.6/authorized"
for X in /sys/bus/usb/devices/*; do
echo"$X"
cat"$X/idVendor" 2>/dev/null
cat"$X/idProduct" 2>/dev/null
echo
done
答案3
重置所有USB1/2/3附加端口[1]：
for i in /sys/bus/pci/drivers/[uoex]hci_hcd/*:*; do
[ -e"$i" ] || continue
echo"${i##*/}" >"${i%/*}/unbind"
echo"${i##*/}" >"${i%/*}/bind"
done
答案4
需要在python脚本中实现自动化，
#!/usr/bin/env python
import os
import sys
from subprocess import Popen, PIPE
import fcntl
driver = sys.argv[-1]
print"resetting driver:", driver
USBDEVFS_RESET= 21780
try:
lsusb_out = Popen("lsusb | grep -i %s"%driver, shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().split()
bus = lsusb_out[1]
device = lsusb_out[3][:-1]
f = open("/dev/bus/usb/%s/%s"%(bus, device), 'w', os.O_WRONLY)
fcntl.ioctl(f, USBDEVFS_RESET, 0)
except Exception, msg:
print"failed to reset device:", msg
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