From: Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>
Date: Mon, 30 Mar 2015 08:35:00 +0000 (+0200)
Subject: iio: mlx90614: Add emissivity setting
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~121^2~761^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fad65a8fe5b85b5039b316258c2790e773cc3502;p=pandora-kernel.git

iio: mlx90614: Add emissivity setting

The mapping from the 16-bit EEPROM value to the decimal 0-1 range is
approximate.  A special case ensures 0xFFFF shows as 1.0 instead of
0.999998565.

Writing to EEPROM requires an explicit erase by writing zero.  In
addition, it takes 20ms for the erase/write to complete.  During this
time no EEPROM register should be accessed.  Therefore, two msleep()s
are added to the write function and a mutex protects against concurrent
access.

Signed-off-by: Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

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