Re: HID device lying about Usage

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On Thu, Jan 28, 2010 at 07:10:17PM +0100, Simon Richter wrote:
> Hi,
> 
> I have a HID device that declares itself as a keyboard, but isn't, which
> I'd like to use under Linux.

This is because being a HID device was the only way to write userspace
Windows code to control USB devices until very recently.  So lots of
manufacturers created "fake" HID devices.  It's a mess.

> I can see three options:
> 
>  - Add an IGNORE quirk to the table, and use the device via the
>    endpoints.

Yup, I recommend this one.  And then write either a new kernel driver,
or a userspace program using libusb to talk to the device.

What type of device is this really?

>  - Invent a new quirk that prevents the device from being connected to
>    anything but hidraw.

If you really want to send HID commands to it.  Does it accept them?
Odds are, it doesn't.

>  - Add a new hidraw ioctl that disconnects all other report sinks.
> 
> Option 3 could possibly be combined with option 2 to form a more generic
> solution, but is obviously the most intrusive approach.
> 
> Which way should I go?

See above.

thanks,

greg k-h
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