linux-kernel - Re: How to use an usb interface than is claimed by HID?

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Date:	Sun, 21 Jan 2007 00:56:26 +0100 (CET)
From:	Jiri Kosina <jikos@...os.cz>
To:	Ivan Ukhov <uvsoft@...il.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: How to use an usb interface than is claimed by HID?

On Sun, 21 Jan 2007, Ivan Ukhov wrote:

> No, it won't do. Imagine that I'm not able to modify the kernel with its 
> drivers. 

Could I ask you what precisely is the driver you are talking about doing? 
Why is it not going to be a part of mainline kernel (i.e. being able to be 
put on blacklist easily).

> It should work with usual kernel and HID driver. So I want my driver to 
> ask the HID driver to free the interfaces or don't claim them at all. Mb 
> there's an example of such a driver?.. obviously there are a lot of HID 
> devices and mb a vendor one of them doesn't want to use HID driver for 
> one of its interfaces to provide some additional features or something, 
> so he should make the kernel use his driver instead of HID...

Sure, there are such in-kernel drivers ... for example Wacom driver. This 
driver is in-kernel, and it is hooked inside the usb_hid_configure() 
function to be ignored by the HID layer completely, and all the driver 
specific handling is handled in drivers/usb/input/wacom*.

(When looking at that code, it looks quite ugly by the way. I have no idea 
why wacom driver is not using HID_QUIRK_IGNORE, but has a hardcoded hook 
in the usb_hid_configure() instead. I will probably fix this.)

Thanks,

-- 
Jiri Kosina
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