[sane-devel] Re: [linux-usb-devel] Yet another mail about libusb and scanner ;-)

[Alan Stern]

On Tue, 20 Apr 2004 syrius.ml@no-log.org wrote:

> Hi,
> 
> I'm trying to get my HP 4300C working.
> For that I'm using sane + the niash external backend.
> niash is compiled to work with libusb.
> 
> here are some informations:
> 
> debian sid + 2.6.5-mm6 kernel
> libsane is 1.0.13
> libusb is 0.1.8
> 
> (atm all commands are run as root)
> 
> After a fresh boot lsusb does not see the scanner.
> But it's present in /proc/bus/usb/device:
>  T:  Bus=02 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#=  5 Spd=12  MxCh= 0
>  D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
>  P:  Vendor=03f0 ProdID=0305 Rev= 0.00
>  C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 48mA
>  I:  If#= 0 Alt= 0 #EPs= 3 Cls=10(unk. ) Sub=01 Prot=00 Driver=(none)
>  E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
>  E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
>  E:  Ad=83(I) Atr=03(Int.) MxPS=   1 Ivl=8ms
> 
> After running 'scanimage -h', lsusb sees the scanner:
>  Bus 002 Device 005: ID 03f0:0305 Hewlett-Packard ScanJet 4300c
> 
> the result of scanimage is:
>  scanimage: open of device niash:libusb:002:005 failed: Device busy
>  List of available devices:
>     niash:libusb:002:005
> 
> when i strace it, it shows:
>  ioctl(6, USBDEVFS_SETCONFIGURATION, 0xbfffead4) = -1 EPROTO (Protocol
>  error)
> and it doesn't produce a kernel error.
> 
> running testtool (correctly compiled for libusb):
>  # ./testtool
>   No NIASH chipset found!
>   _ProbeRegisters failed!
> 
> stracing it shows a lot of:
>  21141 ioctl(4, USBDEVFS_CONTROL, 0xbffffa70) = -1 EPROTO (Protocol
>  error)
> 
> it does produce kernel errors:
>  usbfs: USBDEVFS_CONTROL failed cmd testtool dev 5 rqt 64 rq 12 len 1
>  ret -71
>  usbfs: USBDEVFS_CONTROL failed cmd testtool dev 5 rqt 192 rq 12 len 1
>  ret -71
> 
> result of a 'SANE_DEBUG_SANEI_USB=255 scanimage -h' :
>  [sanei_usb] sanei_usb_open: trying to open device `libusb:002:005'
>  USB error: could not set config 1: Protocol error
>  [sanei_usb] sanei_usb_open: libusb complained: could not set config 1:
>   Protocol error
>  scanimage: open of device niash:libusb:002:005 failed: Device busy
> 
> Any advice ?
> 
> TIA

If this is anything like the problem people saw before, you need to 
disable the usbmodules program.  However the information you provided 
wasn't really sufficient to tell what your problem is.  You might try, for 
example, turning on USB debugging in your kernel's configuration and then 
seeing what goes in your system log when you run lsusb or scanimage.  But 
first try replacing usbmodules with something like /bin/true.

Alan Stern