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Date: Mon, 28 Nov 2011 01:04:46 -0800
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Greg KH <gregkh@suse.de>
Cc: NeilBrown <neilb@suse.de>, Linus Walleij <linus.walleij@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>, myungjoo.ham@gmail.com,
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        Kalle Komierowski <karl.komierowski@stericsson.com>,
        Johan PALSSON <johan.palsson@stericsson.com>,
        Daniel WILLERUD <daniel.willerud@stericsson.com>
Subject: Re: [RFC PATCH 0/3] introduce: Multistate Switch Class
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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