From: Marek Vasut <marek.vasut@gmail.com>
To: Xiangfu Liu <xiangfu.z@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Subject: Re: what is the meaning of matrix_keypad_platform_data.active_low
Date: Tue, 25 Aug 2009 12:21:10 +0200 [thread overview]
Message-ID: <200908251221.10797.marek.vasut@gmail.com> (raw)
In-Reply-To: <4A93903F.3080005@gmail.com>
Dne Út 25. srpna 2009 09:18:23 Xiangfu Liu napsal(a):
> Hi
> ./include/linux/input/matrix_keypad.h
> there no help in matrix_keypad.h about active_low.
>
> I guess. when set active_low to 1.means:
>
> 0: key press
> 1: key not press
>
> right?
Hi, yeah, it means the GPIO pins have inverted voltage levels.
>
> thanks for help.
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WARNING: multiple messages have this Message-ID (diff)
From: Marek Vasut <marek.vasut@gmail.com>
To: Xiangfu Liu <xiangfu.z@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Subject: Re: what is the meaning of matrix_keypad_platform_data.active_low
Date: Tue, 25 Aug 2009 12:21:10 +0200 [thread overview]
Message-ID: <200908251221.10797.marek.vasut@gmail.com> (raw)
In-Reply-To: <4A93903F.3080005@gmail.com>
Dne Út 25. srpna 2009 09:18:23 Xiangfu Liu napsal(a):
> Hi
> ./include/linux/input/matrix_keypad.h
> there no help in matrix_keypad.h about active_low.
>
> I guess. when set active_low to 1.means:
>
> 0: key press
> 1: key not press
>
> right?
Hi, yeah, it means the GPIO pins have inverted voltage levels.
>
> thanks for help.
next prev parent reply other threads:[~2009-08-25 10:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-25 7:18 what is the meaning of matrix_keypad_platform_data.active_low Xiangfu Liu
2009-08-25 10:21 ` Marek Vasut [this message]
2009-08-25 10:21 ` Marek Vasut
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