[libhid-discuss] problems with libhid and Oregon Scientific weather station WMRS203 (interrupt read)

[Jordi Puigsegur]

Hi all,

>
> When I was doing some libusb work, I found that I needed to unbind the
> interface from the driver before I could claim it with libusb. The
> interface will remain unclaimed until the device is connected again. I
> currently run the following commands to unbind the interface whenever
> I need to use the device and libusb can't claim the interface.
>
> # cd /sys/bus/usb/drivers/usbhid
> # echo -n interface > unbind
> "interface" is the name of the interface in the
> /sys/bus/usb/drivers/usbhid folder. For my device, it was something
> like "6-2:1.0". It will look similar for your device. From your lsusb
> output, I'd guess that your interface would have the identifier
> "4-2:1.0". The first part of that identifier varies based on which bus
> and port number your device is plugged into and the second part varies
> with the configuration number (usually always 1) and the interface
> number.
>

I tried that, and the device doesn't appear in /sys/bus/usb/drivers/usbhid.
Nor does it appear under any /sys/bus/usb/drivers directory:

root at puigmal:/sys/bus/usb# ls -R
.:
devices  drivers  drivers_autoprobe  drivers_probe  uevent

./devices:
1-0:1.0  3-1      3-1:1.2  4-1      4-2:1.0  usb1  usb4
2-0:1.0  3-1:1.0  3-1:1.3  4-1:1.0  5-0:1.0  usb2  usb5
3-0:1.0  3-1:1.1  4-0:1.0  4-2      6-0:1.0  usb3  usb6

./drivers:
btusb  hiddev  hub  usb  usbfs  usbhid

./drivers/btusb:
3-1:1.0  3-1:1.1  bind  module  new_id  uevent  unbind

./drivers/hiddev:
bind  module  new_id  uevent  unbind

./drivers/hub:
1-0:1.0  3-0:1.0  5-0:1.0  bind    new_id  unbind
2-0:1.0  4-0:1.0  6-0:1.0  module  uevent

./drivers/usb:
3-1  4-1  4-2  bind  uevent  unbind  usb1  usb2  usb3  usb4  usb5  usb6

./drivers/usbfs:
bind  module  new_id  uevent  unbind

./drivers/usbhid:
4-1:1.0  4-2:1.0  bind  module  new_id  uevent  unbind

root at puigmal:/sys/bus/usb# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 004: ID 047d:1062 Kensington PocketMouse Max
Bus 004 Device 003: ID 0fde:ca01
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 03f0:171d Hewlett-Packard Wireless (Bluetooth + WLAN)
Interface [Integrated Module]
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub


This was done just after starting the computer and plugging in the weather
station, before running any C program.

 Might there be any other program claiming the interface? How could I check
that?

Thanks,
Jordi
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