* Re: failing to force-claim USB interface
@ 2004-01-19 18:04 David Brownell
0 siblings, 0 replies; 2+ messages in thread
From: David Brownell @ 2004-01-19 18:04 UTC (permalink / raw)
To: Martin F Krafft; +Cc: linux-kernel
> I am trying to make use of the usbfs USBDEVFS_DISCONNECT ioctl, and
> I am failing.
Appended, see a snippet of code which worked reliably way back on
the original 2.4 patch. Maybe you tripped on the precondition?
Or maybe this is just broken so far in 2.6.
A fair amount of usbfs code is at least slightly broken in 2.6;
some usbcore driver model changes are still needed in the area
of this particular ioctl. (Which got mangled more than most
during its evolution.) Was this with a 2.6.1 kernel?
I'm thinking this kind of thing ought to be generically doable
with sysfs, maybe with symlink/unlink syscalls between device
and driver nodes.
- Dave
if (ioctl (fd, USBDEVFS_CLAIMINTERFACE, &ifno) < 0) {
#ifdef USBDEVFS_DISCONNECT
int saved_errno = errno;
struct usbdevfs_ioctl command;
int retval;
/*
* maybe we need to boot a kernel driver off before we
* can bind to this. a "polite" unbind might be nice;
* for now we expect apps to adopt a reasonble policy,
* checking if it's claimed already (when it matters).
*/
if (saved_errno != EBUSY)
return -errno;
command.ifno = ifno;
command.ioctl_code = USBDEVFS_DISCONNECT;
command.data = 0;
retval = ioctl (fd, USBDEVFS_IOCTL, &command);
if (retval < 0)
return -saved_errno;
if (ioctl (fd, USBDEVFS_CLAIMINTERFACE, &ifno) < 0)
return -errno;
#else
return -errno;
#endif
}
return 0;
^ permalink raw reply [flat|nested] 2+ messages in thread
* failing to force-claim USB interface
@ 2004-01-19 15:46 Martin F Krafft
0 siblings, 0 replies; 2+ messages in thread
From: Martin F Krafft @ 2004-01-19 15:46 UTC (permalink / raw)
To: linux kernel mailing list
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I am trying to make use of the usbfs USBDEVFS_DISCONNECT ioctl, and
I am failing. Here is the code:
struct usb_device *dev;
[...]
sprintf(path, "/proc/bus/usb/%s/%s", dev->bus->dirname, dev->filename);
int fd = open(path);
struct usbdevfs_ioctl command = { 0, USBDEVFS_DISCONNECT, 0 };
ioctl (fd, USBDEVFS_IOCTL, &command) < 0
However, the ioctl always fails. I am not sure whether I am using
the right values for the file descriptor passed to ioctl(), or what
the interface number (first parameter of usbdevfs_ioctl) is.
Maybe someone could offer me some advice or tell me to RTFM (but
please specify TM to FR).
Thanks,
--
Martin F. Krafft Artificial Intelligence Laboratory
Ph.D. Student Department of Information Technology
Email: krafft@ailab.ch University of Zurich
Tel: +41.(0)1.63-54323 Andreasstrasse 15, Office 2.20
http://ailab.ch/people/krafft CH-8050 Zurich, Switzerland
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