usb scanner configuration: udev

usb scanner configuration: udev

[Thomas Frayne]

My problem looks similar to the one described in the the No Hotplug Events thread.

I am running on an up to date Fedora Core 3 system, and have installed
sane-backends 1.0.15-1.4 and xsane 0.92-13 via synaptic.  Over the last
18 months, I have periodically tried to get my HP 7450C scanner working
under SANE, but was never completely successful.  This time I succeeded.

Now I find that /dev/scanner-usb-:proc:bus:usb:002:010 is a link to
/proc/bus/usb/002/010, but the device name changes when I reboot.  I
would like to use udev to create a constant device name
/dev/usb/scanner0 for this device.  I put entry

SYSFS{product}="hp scanjet 7400c", SYMLINK="as/Scanjet"

into /etc/udev/rules.d/09-tom.rules.  However, if I unplug the scanner
and plug it back in, the log indicates 
Jan  2 23:34:23 PCasus kernel: usb 2-1.1: USB disconnect, address 10
Jan  2 23:34:26 PCasus kernel: usb 2-1.1: new full speed USB device
using address 11
It has no udev log entry.

Before the device address changed /proc/bus/usb/devices contained:
T:  Bus\x02 Lev\x02 Prnt\x02 Port\0 Cnt\x01 Dev#= 10 Spd\x12  MxCh= 0
D:  Ver= 1.00 Cls\0(>ifc ) Sub\0 Prot\0 MxPS= 8 #Cfgs=  1
P:  Vendor\x03f0 ProdID\b01 Rev= 0.01
S:  Manufacturer=hp
S:  Product=hp scanjet 7400c
S:  SerialNumber‡ tem  7400c   
C:* #Ifs= 1 Cfg#= 1 Atr@ MxPwr=  2mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls\0(>ifc ) Sub\0 Prot\0 Driver=(none)
E:  Ad\x01(O) Atr\x02(Bulk) MxPS=   8 Ivl=0ms
E:  Ad‚(I) Atr\x03(Int.) MxPS=   8 Ivl\x10ms
E:  Adƒ(I) Atr\x02(Bulk) MxPS=  64 Ivl=0ms

What is going wrong with udev?

cat /proc/sys/kernel/hotplug returns /sbin/hotplug




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Re: usb scanner configuration: udev

[Greg KH]

On Mon, Jan 10, 2005 at 08:27:14AM -0800, Thomas Frayne wrote:
> My problem looks similar to the one described in the the No Hotplug Events thread.
> 
> I am running on an up to date Fedora Core 3 system, and have installed
> sane-backends 1.0.15-1.4 and xsane 0.92-13 via synaptic.  Over the last
> 18 months, I have periodically tried to get my HP 7450C scanner working
> under SANE, but was never completely successful.  This time I succeeded.
> 
> Now I find that /dev/scanner-usb-:proc:bus:usb:002:010 is a link to
> /proc/bus/usb/002/010, but the device name changes when I reboot.

usb scanners do not have a /dev entry, as they use libusb to access the
device directly through usbfs in userspace.  That is why no udev hotplug
event happens.  I do not know what program created that /dev link, but
it wasn't udev.

I suggest bringing this up on the SANE mailing lists, as there's nothing
we can do here.

Good luck,

greg k-h


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