Hi all,

I am trying to write a custom driver for a HID device.

I understand how to access the device when my driver is called by hid-core hooks (like : .open/.probe/.remove/.raw_event...), since the "struct* hid_device" context comes along.

But I am not quite sure how to have a user-space event trigger access to the device (e.g. by echoing into a chardev node). How can I then retrieve the proper *hid_device , out of context?

I try and learn by reading existing in-kernel specific hid driver but somehow I can't figure out that part.
Thanks for any lead, I 'll do my homework.

m

I don't have much experience with this type of practice. Sorry

These links may prove as useful and get you started.
http://stackoverflow.com/questions/1...out-of-context
http://www.usb.org/developers/hidpage/
http://linux.die.net/man/7/create_trigger
http://unix.stackexchange.com/questi...sb-hid-devices

You could just use a custom driver or generic that would normally take over the device.

In my search for you I found out that the HID subsystem needs 2 kinds of drivers-
http://www.mjmwired.net/kernel/Docum...n/hid/uhid.txt

Hope that helps