From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Subject: Re: [PATCH v4] Input: synaptics-rmi4: Add F30 support
Date: Sun, 27 Jul 2014 00:26:24 -0700
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To: Andrew Duggan <aduggan@synaptics.com>
Cc: linux-input@vger.kernel.org, Christopher Heiny <cheiny@synaptics.com>, Vincent Huang <vincent.huang@tw.synaptics.com>, Vivian Ly <vly@synaptics.com>, Allie Xiong <axiong@synaptics.com>, Linus Walleij <linus.walleij@linaro.org>, Benjamin Tissoires <benjamin.tissoires@redhat.com>, David Herrmann <dh.herrmann@gmail.com>, Jiri Kosina <jkosina@suse.cz>

Hi Andrew,


On Thu, Jul 24, 2014 at 04:47:21PM -0700, Andrew Duggan wrote:
> RMI4 Function 0x30 provides support for GPIOs, LEDs and mechanical
> buttons.  In particular, the mechanical button support is used in
> an increasing number of touchpads.
> 

I was reading the spec for F30 and it looks to me that instead instead of basic
keymap it should actually implement a gpio chip plus LED devices (probably
later). Then, if GPIOs are indeed attached to buttons one can use standard
gpio_keys driver to create input device.

Thanks.

-- 
Dmitry