In the Linux source tree, you can take a look at, for instance,
include/linux/usbdevice_fs.h
drivers/usb/core/devio.c
You may notice some interesting USB specific IOCTLS, such as
USBDEVFS_DISCONNECT
USBDEVFS_CONNECT
USBDEVFS_RESET
There may be some interesting documentation in
Documentation/DocBook/usb.tmpl
You probably need to be root to invoke them. And, they may cause your
machine to hang if the drivers are already misbehaving. But, it's
worth a try.
Relevant C code might look something like this
int usb_ioctl( int bus, int device, int iface, int cmd, void* param ) {
int rv = -1;
int fd = usb_open( bus, device, O_RDWR );
if( fd > 0 ) {
struct usbdevfs_ioctl driver_devinfo_ioctl = { iface, cmd, param };
rv = ioctl( fd, USBDEVFS_IOCTL, &driver_devinfo_ioctl );
close( fd );
}
return rv;
}
int usb_connect( int bus, int device ) {
return usb_ioctl( bus, device, 0, USBDEVFS_CONNECT, NULL );
}
int usb_disconnect( int bus, int device ) {
return usb_ioctl( bus, device, 0, USBDEVFS_DISCONNECT, NULL );
}
int usb_reset( int bus, int device ) {
int rv = -1;
int fd = usb_open( bus, device, O_RDWR );
if( fd > 0 ) {
rv = ioctl( fd, USBDEVFS_RESET, 0 );
close( fd );
}
return rv;
}
Best of luck,
Cory
On 7/18/06, Avinash Sridharan <[EMAIL PROTECTED]> wrote:
Hi,
I am working with tinyos-2.x on tmotes on FC4. These tmotes are connected
to my linux machine through a USB hub so as long as the USB interface
doesn't hang it is quiet convenient to program and reprogram these motes.
There are times however due to segfaults in my code or due to simulataneous
operations that my scripts perform on the USB interface (e.g reading from
the flash while accidentaly programming the motes) that the USB serial
interface hangs.
My question was, is there any mechanism where I can restart these serial
interfaces (/dev/ttyUSB*) through software (probably a script in linux that
does this) or is it only possible to restart the USB device by unplugging
and plugging the motes back in.
Thanks,
Avinash
--
Phd Dept. of Electrical Engineering
University of Southern California
http://www-scf.usc.edu/~asridhar
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