On Sat, 21 Nov 2015, Greg KH wrote:
> > I saved a copy when you first posted it and have used it on quite a few
> > occasions. Maybe the tool should be added to the usbutils collection so
> > it could reach a somewhat wider audience? Yes, I know the usecases are
> > all weird, but that still doesn't mean than everyone with a usecase will
> > read this list :)
>
> I've considered it in the past, but didn't want to deal with all of the
> "this doesn't work on my hardware" emails. Maybe if the code prints out
> a big message when it's run it might help...
It does print out a message, though not a big one. Would you like it
to do something more specific? A more verbose "usage" message,
perhaps?
For convenience, the source code is included below.
Alan Stern
/* usbreset -- send a USB port reset to a USB device */
/* To build: gcc -o usbreset usbreset.c */
#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;
}
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