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Date: Thu, 26 Jul 2012 09:11:10 +0100
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        MyungJoo Ham <myungjoo.ham@samsung.com>,
        patches@opensource.wolfsonmicro.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] extcon: arizona: Implement button detection support
Message-ID: <20120726081110.GA26373@opensource.wolfsonmicro.com>
References: <1342800449-10328-1-git-send-email-broonie@opensource.wolfsonmicro.com> <500F8DB4.30401@samsung.com> <20120725111105.GI3099@opensource.wolfsonmicro.com> <50108AE0.5070502@samsung.com>
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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.