iio: mxs-lradc: compute temperature from channel 8 and 9
authorAlexandre Belloni <alexandre.belloni@free-electrons.com>
Fri, 6 Dec 2013 19:31:00 +0000 (19:31 +0000)
committerJonathan Cameron <jic23@kernel.org>
Sat, 7 Dec 2013 10:38:48 +0000 (10:38 +0000)
commitc8231a9af8147f8a401fc55931ec44abfb937660
tree987b6742d77e67fcb4152a52ae7e1bb5e6d59305
parent098d3beccfb6d678a926c4cc4f5e70c3b752fd5e
iio: mxs-lradc: compute temperature from channel 8 and 9

The mxs LRADC is able to read an internal die temperature sensor. The
temperature has to be calculated from the value read on channel 8 and channel 9.
To be able to expose the result to hwmon, implement iio channel 8 as
(channel 9 - channel 8). Then, implement IIO_CHAN_INFO_SCALE and
IIO_CHAN_INFO_OFFSET so that it can be processed by hwmon through the in kernel
provider/consumer mechanism.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
drivers/staging/iio/adc/mxs-lradc.c