linux-kernel - Re: [PATCH v3 0/6] hid: Introduce device groups

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Date:	Thu, 3 May 2012 14:23:59 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Stephane Chatty <chatty@...c.fr>
Subject: Re: [PATCH v3 0/6] hid: Introduce device groups

> I'm currently on the bug fix I told you earlier. However, I found a
> more problematic bug in the hid_groups functionality.
> 
> Some device, like the Perixx peripad, present several interfaces
> (mouse, keyboard and multitouch).
> The hid groups functionality detects the HID field Contact ID, and
> then forwards all interfaces to hid-multitouch. The point is that
> hid-multitouch does not know how to handle mice and keyboards, and
> then fails handling the interfaces of the device.

I am a bit unclear as to which devices this applies to, but I see two
possible solutions:

1) Add the devices in question back to the have_special_drivers list.

2) Add the interface type to the group descision, which should
probably be done anyway. I have a patch in the pipe that, will send it
later today.

> This particular device is then fully broken (as anyone pumped the events).
> I also noticed the same problem (but less problematic) with cypress
> panels: it presents different vendor interfaces and they are handled
> by hid-multitouch.

It would be great if you could test soution 1) before on a device -
something seems wrong if those interfaces were handled by hid-generic
before, but before getting the logic straight, it does not hurt to
try. :-)

Thanks,
Henrik
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