linux-kernel - Re: [PATCH] Add tsc2007 based touchscreen driver.

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Date:	Thu, 4 Dec 2008 01:56:54 -0800
From:	David Brownell <david-b@...bell.net>
To:	felipe.balbi@...ia.com, ext Kwangwoo Lee <kwangwoo.lee@...il.com>
Cc:	ext Trilok Soni <soni.trilok@...il.com>, dmitry.torokhov@...il.com,
	linux-kernel@...r.kernel.org,
	"linux-omap@...r.kernel.org Mailing List" 
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH] Add tsc2007 based touchscreen driver.

On Thursday 04 December 2008, Felipe Balbi wrote:
> i2c subsystem has smbus emulation. The special reason is just that it's
> simpler for the driver writer ;-)

I'd have said "more portable", actually.  I2C hosts can
do pretty much everything an SMBus host can, but the
converse is not true.

And re i2c_check_functionality() ... yes, use it to make
sure each I2C or SMBus call the driver makes is supported
by the underlying controller.

- Dave

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