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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Anatolij Gustschin <agust@denx.de>
Cc: linux-input@vger.kernel.org
Subject: Re: [PATCH] Input: matrix-keypad - support binary column select gpios
Date: Tue, 29 Jan 2013 17:16:29 -0800	[thread overview]
Message-ID: <20130130011628.GD5446@core.coreip.homeip.net> (raw)
In-Reply-To: <1359462324-7233-1-git-send-email-agust@denx.de>

HI Anatolij,

On Tue, Jan 29, 2013 at 01:25:24PM +0100, Anatolij Gustschin wrote:
> On hardware with limited gpios one column select gpio can select
> two different rows when using some additional hardware logic:
> high value selects one row, low value selects another row. Add
> support for such matrix keyboards and document device tree
> bindings used to describe them.
> 
> Since half of the columns is always not selected, interrupts won't be
> generated for press events on these columns. To generate interrupts
> for not selected columns we need to periodicaly switch to these columns
> in order to catch the potential press events. This is done by additional
> work function.

So this effectively switches the driver from interrupt driven to polled
model, right? The device does not really need an interrupt anymore...

Thanks.

-- 
Dmitry

  reply	other threads:[~2013-01-30  1:16 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-29 12:25 [PATCH] Input: matrix-keypad - support binary column select gpios Anatolij Gustschin
2013-01-30  1:16 ` Dmitry Torokhov [this message]
2013-01-30  8:44   ` Anatolij Gustschin
2013-02-20 19:27 ` [PATCH v2] " Anatolij Gustschin
2013-02-20 21:09   ` Stephen Warren
2013-02-21  7:41   ` Grant Likely

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