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

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Date:	Mon, 28 Nov 2011 01:04:46 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Greg KH <gregkh@...e.de>
Cc:	NeilBrown <neilb@...e.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, myungjoo.ham@...il.com,
	linux-kernel@...r.kernel.org, Mike Lockwood <lockwood@...roid.com>,
	Arve Hjønnevåg <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 Mon, Nov 28, 2011 at 04:27:13PM +0900, Greg KH wrote:
> On Mon, Nov 28, 2011 at 12:31:14PM +1100, NeilBrown wrote:
> > 
> >  My own thought is that this deserves a new device class which allows easy
> >  hook-up of in-kernel signalling using notifications and which can be
> >  exported as input devices in much the same way the 'gpio' devices can be
> >  exported via gpio_keys.  The switch could also optionally be exported through
> >  sysfs much like gpio can be exported through sysfs.
> 
> That might also work, but again, odds are the HID spec already defines
> this type of "switch", so why recreate it as a different type of device?

HID does not map 1:1 on input. There are items in HID that are better
served by other subsystems.

-- 
Dmitry
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