[libhid-discuss] linux usbhid module claiming my device

Charles Lepple clepple at ghz.cc
Wed Sep 9 23:37:13 UTC 2009


On Sep 9, 2009, at 10:35 AM, Gabriel Rossetti wrote:

> Hello,
>
> I have a problem where on linux the usbhid module claims my custom  
> device. I used the hid_force_open() function and it is able to  
> release the device and claim it but when I try to use  
> hid_interrupt_read() it says that the device is busy :
>
> NOTICE: hid_force_open(): successfully opened USB device 001/035[0].
> TRACE: hid_interrupt_read(): retrieving interrupt report from device  
> 001/035[0] ...
> WARNING: hid_interrupt_read(): failed to get interrupt read from  
> device 001/035[0]: could not claim interface 0: Device or resource  
> busy

Is there any indication that the usbhid module is still claiming the  
device after you successfully use hid_force_open()? If so, then  
usb_detach_kernel_driver_np() is not doing its job, and it might be a  
libusb question.

> Does anyone know how to deal with this (hopefully programically)? I  
> use version 0.2.15+20060325-2.1 (ubuntu 8.04), installed using  
> aptitude.
>
> Thank you,
> Gabriel
>
> PS
> should I also post on libusb since libhid is built on top of it?

Possibly. I wouldn't advise cross-posting directly - there probably  
aren't too many people on the libusb list who know much about libhid.

For reference, the source code to hid_force_open() is here:
http://libhid.alioth.debian.org/doc/hid__opening_8c-source.html#l00241



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