linux-kernel - Re: camera on n900, v4.8

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Date:   Mon, 10 Oct 2016 10:48:59 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     sre@...nel.org, kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com
Subject: Re: camera on n900, v4.8

On Wednesday 05 October 2016 21:03:41 Pavel Machek wrote:
> Hi!
> 
> Camera has some non-trivial dependencies on N900; it seems to rely on
> gpio-switch.c, for example. I'll try to strip the diff further, but in
> the meantime, here's the version I'm working with.
> 
> 									Pavel
> 
> 

With "Camera" do you mean some Maemo userspace application? Because I
think that nobody else could depends on gpio-switch kernel driver.

Anyway, it should be easy to rewrite such gpio-switch application to use
either input kernel events (from /dev/input/something) or directly check
gpio state via /sys/class/gpio/.

IIRC Maemo's Camera needed gpio-switch for testing if back camera cover
is open or closed and for checking when camera push button pressed and
released.

-- 
Pali Rohár
pali.rohar@...il.com