On Tue, Aug 05, 2008 at 12:37:48AM +0200, Giuseppe Sacco wrote:
> On Tue, 5 Aug 2008 00:28:29 +0200 Aurelien Jarno <[EMAIL PROTECTED]> wrote:
> [...]
> > So it seems it can't open the devices. The corresponding code in libusb
> > is:
> >
> > fd = open(filename, O_RDWR);
> > if (fd < 0) {
> > fd = open(filename, O_RDONLY);
> > if (fd < 0) {
> > if (usb_debug >= 2)
> > fprintf(stderr, "usb_os_find_devices: Couldn't open %s\n",
> > filename);
> >
> > So either it is a bug in the kernel, either udev creates the wrong
> > devices. Running "strace lsusb" will most probably give the answer.
>
> strace shows
> 11584 fstat64(3, {st_mode=S_IFDIR|0755, st_size=180, ...}) = 0
> 11584 getdents(3, /* 9 entries */, 4096) = 144
> 11584 open("/dev/bus/usb/003/007", O_RDWR) = -1 ENOENT (No such file or
> directory)
> 11584 open("/dev/bus/usb/003/007", O_RDONLY) = -1 ENOENT (No such file or
> directory)
> 11584 open("/dev/bus/usb/003/006", O_RDWR) = -1 ENOENT (No such file or
> directory)
> 11584 open("/dev/bus/usb/003/006", O_RDONLY) = -1 ENOENT (No such file or
> directory)
>
> but those files are there. (Strange thing: old files aren't deleted when
> device is unplugged.)
The fact that the files are there doesn't mean they are usable, they
also have to be known by the kernel.
> [EMAIL PROTECTED]:~$ ls -l /dev/bus/usb/003/00*
> crw-rw---- 1 root root 189, 0 2008-08-05 08:07 /dev/bus/usb/003/001
> crw-rw-r-- 1 root scanner 189, 1 2008-08-04 18:33 /dev/bus/usb/003/002
> crw-rw---- 1 root root 189, 2 2008-08-04 19:11 /dev/bus/usb/003/003
> crw-rw---- 1 root root 189, 3 2008-08-04 19:11 /dev/bus/usb/003/004
> crw-rw-r-- 1 root scanner 189, 4 2008-08-04 19:13 /dev/bus/usb/003/005
> crw-rw---- 1 root root 189, 5 2008-08-04 23:55 /dev/bus/usb/003/006
> crw-rw---- 1 root root 189, 6 2008-08-04 23:55 /dev/bus/usb/003/007
>
> major 189 is USB, as shown from:
>
> [EMAIL PROTECTED]:~$ grep 189 /proc/devices
> 189 usb_device
>
What is strange is that the minor should be (bus * 128) + device. This
is not the case here. Try to manually create the device node with mknod
according to this formula to see if it works.
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' [EMAIL PROTECTED] | [EMAIL PROTECTED]
`- people.debian.org/~aurel32 | www.aurel32.net
--
To UNSUBSCRIBE, email to [EMAIL PROTECTED]
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
