Commit 2993f34f authored by jow's avatar jow

[package] add usbreset - a small simple utility to send port rests to selected usb devices (#10394)

git-svn-id: svn:// 3c298f89-4303-0410-b956-a3cf2f4a3e73
parent 2c7dddc2
# Copyright (C) 2011
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
include $(TOPDIR)/
include $(INCLUDE_DIR)/
define Package/usbreset
TITLE:=Utility to send a USB port reset to a USB device
MAINTAINER:=Jo-Philipp Wich <>
define Package/usbreset/description
This package contains the small usbreset utility which
can be used to send a USB port reset to a USB device -
useful for debugging or to force re-detection of particular
define Build/Prepare
$(INSTALL_DATA) ./src/usbreset.c $(PKG_BUILD_DIR)/
define Build/Compile
-o $(PKG_BUILD_DIR)/usbreset $(PKG_BUILD_DIR)/usbreset.c
define Package/usbreset/install
$(INSTALL_DIR) $(1)/usr/bin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/usbreset $(1)/usr/bin/
$(eval $(call BuildPackage,usbreset))
/* usbreset -- send a USB port reset to a USB device */
and needs mounted usbfs filesystem
sudo mount -t usbfs none /proc/bus/usb
There is a way to suspend a USB device. In order to use it,
you must have a kernel with CONFIG_PM_SYSFS_DEPRECATED turned on. To
suspend a device, do (as root):
echo -n 2 >/sys/bus/usb/devices/.../power/state
where the "..." is the ID for your device. To unsuspend, do the same
thing but with a "0" instead of the "2" above.
Note that this mechanism is slated to be removed from the kernel within
the next year. Hopefully some other mechanism will take its place.
> To reset a
> device?
Here's a program to do it. You invoke it as either
usbreset /proc/bus/usb/BBB/DDD
usbreset /dev/usbB.D
depending on how your system is set up, where BBB and DDD are the bus and
device address numbers.
Alan Stern
#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");
return 0;
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