[sane-devel] Problem in detecting usb scanner

[Wolfram Heider]

Giuseppe,

silly question: did you specify the location of the firmware (is required  
by the backend for the Epson Perfection 1670 as far as I know)?

Regards
Wolfram Heider


On Sun, 03 Aug 2008 21:05:41 +0200, Giuseppe Sacco  
<giuseppe at eppesuigoccas.homedns.org> wrote:

> Hi all,
> I am testing once again a new linux kernel for mips architecture (both
> 2.6.26-rc9 and 2.6.26.1). On this machine (SGI O2) I am trying an usb
> scanner (epson perfection 1670) without luck, but I suspect something is
> missing among kernel modules.
>
>  currently installed SANE is
> giuseppe at sgi:~$ LC_LANG=C dpkg -l \*sane\* | grep ^ii
> ii  libsane                1.0.18-5       API library for scanners
> ii  sane                   1.0.14-2       scanner graphical frontends
> ii  sane-utils             1.0.18-5       API library for scanners --  
> utilities
>
> What happens:
>  when I plug in the usb cable, I get those new lines in syslog:
> [17221259.260000] usb 3-2: new high speed USB device using ehci_hcd and  
> address 2
> [17221259.440000] usb 3-2: configuration #1 chosen from 1 choice
> [17221259.496000] usb 3-2: New USB device found, idVendor=04b8,  
> idProduct=011f
> [17221259.532000] usb 3-2: New USB device strings: Mfr=1, Product=2,  
> SerialNumber=0
> [17221259.564000] usb 3-2: Product: EPSON Scanner
> [17221259.596000] usb 3-2: Manufacturer: EPSON
>
>  then a new device appears as /dev/bus/usb/003/002. This device is
> correctly owned by scanner group, so udev communicate with the scanner
> and correctly get vendor/product
> giuseppe at sgi:~$ find /dev/bus/usb/ -ls
>   1671    0 drwxr-xr-x   5 root     root          100 ago  3  2008  
> /dev/bus/usb/
>   1699    0 drwxr-xr-x   2 root     root           80 ago  3 19:15  
> /dev/bus/usb/003
> 207260    0 crw-rw-r--   1 root     scanner           ago  3 19:15  
> /dev/bus/usb/003/002
>   1700    0 crw-rw-r--   1 root     root              ago  3 19:17  
> /dev/bus/usb/003/001
>   1691    0 drwxr-xr-x   2 root     root           60 ago  3  2008  
> /dev/bus/usb/002
>   1692    0 crw-rw-r--   1 root     root              ago  3 19:17  
> /dev/bus/usb/002/001
>   1672    0 drwxr-xr-x   2 root     root           60 ago  3  2008  
> /dev/bus/usb/001
>   1673    0 crw-rw-r--   1 root     root              ago  3 19:17  
> /dev/bus/usb/001/001
>
>  libusb might use /proc/bus/usb instead of /dev/bus/usb, so check it:
> giuseppe at sgi:~$ find /proc/bus/usb/ -ls
>   1430    0 drwxr-xr-x   5 root     root            0 ago  3 21:19  
> /proc/bus/usb/
>   1486    0 dr-xr-xr-x   2 root     root            0 ago  3 21:19  
> /proc/bus/usb/003
> 207166    0 -rw-r--r--   1 root     root           57 ago  3 19:15  
> /proc/bus/usb/003/002
>   1490    0 -rw-r--r--   1 root     root           43 ago  3 21:19  
> /proc/bus/usb/003/001
>   1474    0 dr-xr-xr-x   2 root     root            0 ago  3 21:19  
> /proc/bus/usb/002
>   1482    0 -rw-r--r--   1 root     root           43 ago  3 21:19  
> /proc/bus/usb/002/001
>   1432    0 dr-xr-xr-x   2 root     root            0 ago  3 21:19  
> /proc/bus/usb/001
>   1470    0 -rw-r--r--   1 root     root           43 ago  3 21:19  
> /proc/bus/usb/001/001
>   1431    0 -r--r--r--   1 root     root            0 ago  3 19:15  
> /proc/bus/usb/devices
>
>  why /proc/bus/usb/003/002 is not owned by scanner group?
>
>  sane-find-scanner doesn't find any scanner. Logging sanei_usb I see:
> giuseppe at sgi:~$ env SANE_DEBUG_SANEI_USB=255 sane-find-scanner
> [sanei_debug] Setting debug level of sanei_usb to 255.
> [sanei_usb] sanei_usb_init: Looking for kernel scanner devices
> [sanei_usb] sanei_usb_init: can't stat /dev/usb/: No such file or  
> directory
> [sanei_usb] sanei_usb_init: Looking for libusb devices
> usb_set_debug: Setting debugging level to 255 (on)
> usb_os_find_busses: Found 003
> usb_os_find_busses: Found 002
> usb_os_find_busses: Found 001
> usb_os_find_devices: Couldn't open /dev/bus/usb/003/002
> usb_os_find_devices: couldn't get connect info
> [...]
>
>  currently loaded modules are:
> giuseppe at sgi:~$ lsmod | egrep 'usb|hcd'
> ehci_hcd               64240  0
> ohci_hcd               37040  0
> usbcore               223696  3 ehci_hcd,ohci_hcd
>
>  finally, why lsusb does not list the scanner?
> giuseppe at sgi:~$ lsusb
> Bus 003 Device 001: ID 1d6b:0001
> Bus 002 Device 001: ID 1d6b:0001
> Bus 001 Device 001: ID 1d6b:0001
> giuseppe at sgi:~$ sudo lsusb
> Password:
> Bus 003 Device 001: ID 1d6b:0001
> Bus 002 Device 001: ID 1d6b:0001
> Bus 001 Device 001: ID 1d6b:0001
>
> Many thanks to all,
> Giuseppe
>
>
>