linux-kernel - Re: [PULL-REQUEST] EXTCON Patches (Re: [PATCH v6 0/5] Introduce External Connector Class (extcon))

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Message-ID: <20120305120743.GE3224@opensource.wolfsonmicro.com>
Date:	Mon, 5 Mar 2012 12:07:43 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	MyungJoo Ham <myungjoo.ham@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	LKML <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>,
	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: [PULL-REQUEST] EXTCON Patches (Re: [PATCH v6 0/5] Introduce
 External Connector Class (extcon))

On Mon, Mar 05, 2012 at 04:59:42PM +0900, MyungJoo Ham wrote:
> On Wed, Feb 29, 2012 at 9:35 PM, Mark Brown

> > For things like headphone detection the actual switch they're providing
> > has issues too even just within the switch API - it's called "h2w" with
> > magic values.

> Reading an H2W switch device driver
> (http://git.ziggy471.com/frankenstine.git/plain/arch/arm/mach-msm/htc_headset_mgr.c),
> I don't see why it won't be compatible after replacing the name from

That's not the only such driver, that's one example of a machine
specific accessory detection driver.  There's others out there such as
the sec_jack driver which you converted into the ADC driver in your
patches (if you look at how that gets deployed the overwhelming majority
of users are headsets).

The issue is the combination of the naming (h2w isn't very meaningful
and only works with a single jack) and the magic numbers used for
reporting state, plus the registration collisions.  Existing code can be
ported over fairly easily but it's got issues as an ABI which we'd want
to fix.

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