linux-kernel - Re: [PATCH v2 0/3] Input: cyttsp4 - driver for Cypress TMA4XX touchscreen devices

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Message-ID: <20120914184636.GA2976@polaris.bitmath.org>
Date:	Fri, 14 Sep 2012 20:46:36 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Ferruh Yigit <fery@...ress.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Kevin McNeely <kev@...ress.com>,
	Phil Warkentin <pwar@...ress.com>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Shawn Landden <shawnlandden@...il.com>,
	Ashish Jangam <ashish.jangam@...tcummins.com>,
	Olivier Sobrie <olivier@...rie.be>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Input: cyttsp4 - driver for Cypress TMA4XX
 touchscreen devices

Hi Ferruh,

> This driver is for Cypress TrueTouch(tm) Standard Product controllers,
> Generation4 devices.
> 
> This is second version of driver, code re-structured to match with
> existing Generation3 driver code.

To integrate with the existing gen3 driver is clearly not the same as
creating a parallel set of files, which obviously share a lot of code
with the gen3 code.

For instance, the i2c transfer layer seems more or less identical to
the existing one; just look at cyttsp_i2c_write_block_data() versus
cyttsp4_i2c_write_block_data(). If different generations of device
data cannot even be transported through the same _generic_ interface,
something is clearly not right.

You can't seriously expect anyone to want to maintain one set of files
for every new version. Please make sure to build on what is already
there.

Thanks.
Henrik
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