linux-kernel - Re: [PATCH 4/5] HID: autoload hid-multitouch as needed

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Date:	Tue, 13 Mar 2012 17:13:29 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Stéphane Chatty <chatty@...c.fr>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	"benjamin.tissoires" <benjamin.tissoires@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo F. Padovan" <padovan@...fusion.mobi>,
	linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH 4/5] HID: autoload hid-multitouch as needed

On Tue, 13 Mar 2012, Stéphane Chatty wrote:

> > Let me answer by a bit of history here. Originally, there have been 
> > two copies of HID code in the kernel -- one for USB HID devices, one 
> > for Bluetooth HID devices. The parsers were not kept in sync, and 
> > there was a lot of code duplication, creating quite some mess.
> > 
> > What I did back then in 2006 was that I have extracted the abstract HID 
> > parts into HID core, and made it transport-independent in principle, so 
> > that both USB HID and Bluetooth HID shared the common infrastructure, 
> > while implementing different transport protocols.
> > 
> > Then we extended it a little bit further, making HID core a proper bus, to 
> > which individual drivers (independently on underlying transport protocol 
> > used) can register.
> > 
> > Currently there are just Bluetooth (hidp) and USB (usbhid) transport 
> > implementations, with HID core being transport independent.
> > 
> > Hope this helps,
> 
> Very useful clarification, thanks. Now, I guess I understand why Marcel 
> wants to keep hidp in bluetooth/. And, to be honest, things would have 
> been clearer to me when I explored the handling of the USB/HID class if 
> I had found a hid (or usbhid) directory in usb/ rather than a usbhid 
> subdirectory in hid/: it did not make the above situation very obvious 
> to me. Don't you think we could go along with Marcel and move usbhid to 
> usb/?

It seemed to be convenient back then, and it's still convenient for me in 
some sense, as I am maintaining both HID core and USB HID, but bluetooth 
guys are maintaining the bluetooth transport.

But I don't have strong opinion either way, I can as well move usbhid to 
drivers/usb and maintain it there (will need to talk to Greg about it 
first of course). But frankly, I don't see it making things magically 
clear for everyone :)

-- 
Jiri Kosina
SUSE Labs
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