linux-kernel - Re: [PATCH v3] Input: tsc2005

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Message-ID: <20151030010151.GA4196@qwerty.qwertyembedded>
Date:	Thu, 29 Oct 2015 20:01:51 -0500
From:	Michael Welling <mwelling@...e.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	kbuild test robot <lkp@...el.com>, kbuild-all@...org,
	Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>,
	Felipe Balbi <balbi@...com>,
	Sebastian Reichel <sre@...nel.org>,
	Roger Quadros <rogerq@...com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v3] Input: tsc2005 - Add support for tsc2004

On Fri, Oct 30, 2015 at 09:39:05AM +0900, Mark Brown wrote:
> On Thu, Oct 29, 2015 at 03:23:31PM -0700, Dmitry Torokhov wrote:
> 
> > However, you have regmap in the driver core already. Mark, is it
> > possible to have regmap API also allow doing raw underlying protocol
> > transfer so that consumers could issue command requests without needing
> > to know if they need to do it over i2c or spi or whatever. Or we need a
> > notion of command registers in regmap...
> 
> I don't think it's a good idea to break the encapsulation of the regmap
> and export the raw I/O functionality directly, there seem to be more bad
> ways of using that than good.  The driver must at some point know what
> bus it is dealing with and be able to manage this itself.
> 
> I don't know what "command registers" are.

With this device, if the MSB of the first byte of the transaction is 1 then
a convertor command is encoded in that byte instead of a register address.

So here is my plan:
- Add a function pointer for tsc2005_cmd in the struct tsc2005
- Put the spi and i2c tsc2005_cmd versions in their respective drivers
- Pass the cmd functions to the core via tsc200x_probe

Any objections?
Other review suggestions before I code the revision?
Am I doing too much with a single patch?

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