linux-kernel - Re: [PATCH] lis3lv02d: Add STMicroelectronics lis33ldlh digital

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Message-ID: <20120119172933.GI3178@opensource.wolfsonmicro.com>
Date:	Thu, 19 Jan 2012 17:29:33 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"AnilKumar, Chimata" <anilkumar@...com>,
	Jonathan Cameron <jic23@....ac.uk>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"greg@...ah.com" <greg@...ah.com>,
	"eric.piel@...mplin-utc.net" <eric.piel@...mplin-utc.net>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH] lis3lv02d: Add STMicroelectronics lis33ldlh digital

On Thu, Jan 19, 2012 at 05:10:45PM +0000, Arnd Bergmann wrote:

> Having custom user interfaces inside an input driver however is very
> bad. I'm sure that other accelerometers will have the same requirements
> regarding polling frequency and enable/disable in android as well as
> anytwhere else and it should absolutely not be handled by a user space
> HAL but instead inside of the kernel, using a common method for all
> available drivers.

The polling frequency thing isn't even accelerometer specific, there's a
general need for this on a wide range of other things like touchscreens
(where controlling the sample rate is interesting for power, there are
widely varying requirements depending on what the screen is doing).
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