linux-kernel - Re: [RFC PATCH 0/3] introduce: Multistate Switch Class

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Date:	Wed, 30 Nov 2011 09:46:09 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	MyungJoo Ham <myungjoo.ham@...il.com>
Cc:	Greg KH <gregkh@...e.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	NeilBrown <neilb@...e.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Mike Lockwood <lockwood@...roid.com>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Donggeun Kim <dg77.kim@...sung.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Kalle Komierowski <karl.komierowski@...ricsson.com>,
	Johan PALSSON <johan.palsson@...ricsson.com>,
	Daniel WILLERUD <daniel.willerud@...ricsson.com>
Subject: Re: [RFC PATCH 0/3] introduce: Multistate Switch Class

On Wed, Nov 30, 2011 at 03:58:54PM +0900, MyungJoo Ham wrote:
> On Wed, Nov 30, 2011 at 3:35 PM, Greg KH <gregkh@...e.de> wrote:

> > Actually, why can't we just use gpio as-is here and just treat these
> > devices as "generic" i/o "pins"?

> For userspace, GPIO should work.

> For device drivers, I'm not sure.

> In order to work for device drives, a GPIO event (GPIO Input goes L->H
> or H->L) should trigger events in other device drivers. The GPIO value
> can be set by the external-connector/multistate-switch driver
> (notifier) based on its own interrupts.

We also need some way to group things together so that we can understand
that we've got a single connector that can detect multiple things (eg,
understanding that a cable hsa audio and video capability).
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