linux-kernel - Re: [PATCH v5 4/5] Extcon: support mutually exclusive relation between cables.

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Message-Id: <201202241253.52336.arnd@arndb.de>
Date:	Fri, 24 Feb 2012 12:53:52 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	MyungJoo Ham <myungjoo.ham@...il.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.de>,
	Randy Dunlap <rdunlap@...otime.net>,
	Mike Lockwood <lockwood@...roid.com>,
	Arve Hjønnevag <arve@...roid.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Donggeun Kim <dg77.kim@...sung.com>,
	gregkh@...uxfoundation.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Morten CHRISTIANSEN <morten.christiansen@...ricsson.com>,
	John Stultz <john.stultz@...aro.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH v5 4/5] Extcon: support mutually exclusive relation between cables.

On Friday 24 February 2012, MyungJoo Ham wrote:
> Ok, here goes an example how it would look like in the next revision of Extcon.
> I think this addresses your comments on multistate-support patch (3/5)
> 
> /sys/class/extcon/max8997-muic.0/
>         name: "max8997-muic.0"
>         state: 0x00000009                   /* RW. 0xblahblah format
> for both read and write */
>         mutually_exclusive/
>                 rule.0: 0x3
>                 rule.1: 0x5
>                 rule.2: 0xC
>         cable.0/
>                 name: "VGA"
>                 state: 1            /* RW: 0 or 1 */
>                 mutually_exclusive/
>                         cable.1
>                         cable.2
>         cable.1/
>           ...
> 
> 
> How about this?
> 

I would leave out the global mutually_exclusive/ directory because that
is redundant and I see no benefit in it. Having the redundant "state"
files is probably a good idea because the global one lets you make
atomic changes of multiple cables and the other are very convenient.

What kind of object is /sys/class/extcon/max8997-muic.0/cable.0/mutually_exclusive?
Is that a file with two lines, a directory with two empty files or
a directory with symlinks to the other directories?

	Arnd
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