linux-kernel - Re: [linux-usb-devel] [RFC] HID bus design overview.

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Message-ID: <Pine.LNX.4.64.0704051034100.4173@jikos.suse.cz>
Date:	Thu, 5 Apr 2007 10:36:43 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Adam Kropelin <akropel1@...hester.rr.com>
Cc:	Li Yu <raise.sail@...il.com>, yanghong@...ss.com.cn,
	linux-usb-devel <linux-usb-devel@...ts.sourceforge.net>,
	hongzhiyi@...ss.com.cn, Marcel Holtmann <marcel@...tmann.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] [RFC] HID bus design overview.

On Wed, 4 Apr 2007, Adam Kropelin wrote:

> > hiddev will have to stay for quite some time, exactly because of 
> > backward compatibility with userspace applications/drivers that use it 
> > (I am not aware of many of them though, but apparently there are 
> > some).
> Apcupsd is the one on my mind, but I believe there are others.

I am aware only of apcupsd, nut and hid2hci.

> On Apcupsd we've recently introduced a libusb-based driver that does all 
> HID parsing in userspace. Not only does that free us from hiddev, it 
> also frees us from the umpteen other proprietary HID interfaces across 
> various platforms. Although the hiddev-based driver is still the default 
> for Linux platforms, I plan to change that in the next major release and 
> thus begin migrating folks off of hiddev.

Great. Do you use libusb to obtain raw hid events? Could you by any chance 
look at current implementation of hidraw (it's in -mm or I can send it to 
you as a separate patch) and check whether you have any comments on this? 
It would be good if you could use hidraw rather than reading raw usb data 
through libusb.

Thanks.

-- 
Jiri Kosina
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