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iio:temperature: Add MAX31856 thermocouple support

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This patch adds support for Maxim MAX31856 thermocouple
temperature sensor support.

More information can be found in:
https://www.maximintegrated.com/en/ds/MAX31856.pdf

NOTE: Driver support only Comparator Mode.

Signed-off-by: Paresh Chaudhary <paresh.chaudhary@rockwellcollins.com>
Signed-off-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Patrick Havelange <patrick.havelange@essensium.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Paresh Chaudhary
2019-03-26 12:18:42 +01:00
committed by Jonathan Cameron
parent 8fede567b8
commit fb55a51310
4 changed files with 388 additions and 0 deletions
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Documentation/ABI/testing/sysfs-bus-iio-temperature-max31856 Normal file
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What: /sys/bus/iio/devices/iio:deviceX/fault_oc
KernelVersion: 5.1
Contact: linux-iio@vger.kernel.org
Description:
Open-circuit fault. The detection of open-circuit faults,
such as those caused by broken thermocouple wires.
Reading returns either '1' or '0'.
'1' = An open circuit such as broken thermocouple wires
has been detected.
'0' = No open circuit or broken thermocouple wires are detected
What: /sys/bus/iio/devices/iio:deviceX/fault_ovuv
KernelVersion: 5.1
Contact: linux-iio@vger.kernel.org
Description:
Overvoltage or Undervoltage Input Fault. The internal circuitry
is protected from excessive voltages applied to the thermocouple
cables by integrated MOSFETs at the T+ and T- inputs, and the
BIAS output. These MOSFETs turn off when the input voltage is
negative or greater than VDD.
Reading returns either '1' or '0'.
'1' = The input voltage is negative or greater than VDD.
'0' = The input voltage is positive and less than VDD (normal
state).