linux-kernel - Re: [PATCH] extcon: arizona: Implement button detection support

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Message-ID: <20120726081110.GA26373@opensource.wolfsonmicro.com>
Date:	Thu, 26 Jul 2012 09:11:10 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extcon: arizona: Implement button detection support

On Thu, Jul 26, 2012 at 09:10:08AM +0900, Chanwoo Choi wrote:

> If user press BTN_0 and BTN_1 at the same time and then user only
> released BTN_0 but BTN_1 is still pressed, is it right that report
> released event to all of buttons? I think that different event between
> BTN_0 and BTN_1.

That situation can't occur, the hardware can only detect one button at
once - if two buttons are pressed simultaneusly only one will be
reported.  This is just a standard resistive headset button detection
mechanism.
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