From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: linux-media@vger.kernel.org
Cc: pavel@ucw.cz
Subject: v4l: Add camera voice coil lens control class, current control
Date: Tue, 14 Feb 2017 14:03:00 +0200 [thread overview]
Message-ID: <1487073782-27366-1-git-send-email-sakari.ailus@linux.intel.com> (raw)
Hi folks,
I wanted to refresh my voice coil lens patchset before we have more voice
coil lens controller drivers. The VOCUS_ABSOLUTE control really is not a
best control ID to control a voice coil driver's current.
There may be additional controls in the class: the hardware I'm familiar
with provides other controls (PWM vs. linear mode, resonance frequency and
ringing compensation formula to name a few) but I'm not fully certain
they're something that even should be told to the user --- let alone
giving the user write access to them.
My expectation is still that there will be more controls in the class. The
PWM / linear mode might be one candidate: PWM saves power but it may cause
other issues. These other issues might be something to ignore, depending
on the use case. That will be anyway left for the future.
--
Kind regards,
Sakari
next reply other threads:[~2017-02-14 12:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-14 12:03 Sakari Ailus [this message]
2017-02-14 12:03 ` [PATCH v2 1/2] v4l: Add camera voice coil lens control class, current control Sakari Ailus
2017-02-14 12:03 ` [PATCH v2 2/2] ad5820: Use VOICE_COIL_CURRENT control Sakari Ailus
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