Re: [PATCH 1/1] v4l: Add camera voice coil lens control class, current control

From	Pavel Machek <pavel@ucw.cz>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/1] v4l: Add camera voice coil lens control class, current control
Date	2016-06-18 13:30 +0200
Message-ID	<rLmBP-3nI-1@gated-at.bofh.it> (permalink)
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Hi!

> If someone has analyzed the existing voice coil lens controllers and could 
> share the result, in term of what parameters need to be controlled by the 
> system and how they should be controlled, that would be very appreciated. Even 
> better would be a real userspace implementation of a voice coil lens control 
> algorithm.

Userspace implementation exists, it is called fcam-dev. What it
does... Starts capture, selects focus speed, makes it go through focus
range, looks for the sharpest image in the stream.

Then it computes time when the image was sharpest and thus lens
position, and goes back there.

So for ad5820, we need basically focus position and focus speed. (And
some 16/64 option).

Other coil drivers also have PWM vs. linear option.

Best regards,

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Thread

[PATCH 1/1] v4l: Add camera voice coil lens control class, current control Sakari Ailus <sakari.ailus@linux.intel.com> - 2016-06-12 22:50 +0200
  Re: [PATCH 1/1] v4l: Add camera voice coil lens control class,  current control Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> - 2016-06-12 23:50 +0200
    Re: [PATCH 1/1] v4l: Add camera voice coil lens control class,  current control Pavel Machek <pavel@ucw.cz> - 2016-06-18 00:20 +0200
      Re: [PATCH 1/1] v4l: Add camera voice coil lens control class, current control Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-06-18 00:40 +0200
        Re: [PATCH 1/1] v4l: Add camera voice coil lens control class,  current control Pavel Machek <pavel@ucw.cz> - 2016-06-18 13:30 +0200
  Re: [PATCH 1/1] v4l: Add camera voice coil lens control class,  current control Pavel Machek <pavel@ucw.cz> - 2016-06-18 00:10 +0200

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