linux-kernel - Re: [PATCH v3] Input: Elan HID-I2C device driver

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Message-ID: <20120411162519.GA27562@core.coreip.homeip.net>
Date:	Wed, 11 Apr 2012 09:25:19 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	林彥佑 <tom_lin@....com.tw>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	djkurtz@...omium.org, Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH v3] Input: Elan HID-I2C device driver

On Wednesday, April 11, 2012 06:09:03 PM 林彥佑 wrote:
> Hi Daniel
> 
> On 04/11/2012 03:12 PM, Dmitry Torokhov wrote:
> > Hi Tom,
> > 
> > On Tue, Apr 10, 2012 at 08:42:46PM +0800, Tom Lin wrote:
> >> This patch adds driver for Elan I2C touchpad. These protocol of HID-I2C
> >> was
> >> defined by Microsoft. The kernel driver would use the multi-touch
> >> protocol
> >> format B.
> > 
> > If this device truly supports HID protocol shouldn't we define i2c-hid
> > transport, similar to usbhid?
> 
> I merely follow defined by Microsoft.
> It was called "HID OVER I2C" by Microsoft.
> (http://msdn.microsoft.com/en-us/library/windows/hardware/hh825917(v=vs.85).
> aspx) But I agree to change from hid i2c to i2chid.
> Do you have any better opinions?

I am not sure we are talking about same thing... I do not really care
whether it is named "hid i2c" or "i2chid". What I meant if the device
really speaks HID protocol, except that the transport is not USB or
bluetooth but I2C, then instead of writing a custom driver for this
particular part we need to add a new HID transport into
drivers/hid/i2c-hid that is similar to drivers/hid/usbhid/ and reuse the
rest of HID framework along with hid- multitouch.c which handles
HID-compliant multitouch devices.

I am CCing Jiri (HID maintainer) for additional input.

Thanks.

-- 
Dmitry
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