iio: mlx90614: Add emissivity setting

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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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Vianney le Clément de Saint-Marcq 2015-03-30 10:35:00 +02:00 • committed by Jonathan Cameron

parent 5147b21a61

commit fad65a8fe5

1 changed files with 103 additions and 3 deletions

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106

drivers/iio/temperature/mlx90614.c

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