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thermal: generic-adc: Add ADC based thermal sensor driver

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In some of platform, thermal sensors like NCT thermistors are
connected to the one of ADC channel. The temperature is read by
reading the voltage across the sensor resistance via ADC. Lookup
table for ADC read value to temperature is referred to get
temperature. ADC is read via IIO framework.

Add support for thermal sensor driver which read the voltage across
sensor resistance from ADC through IIO framework.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Laxman Dewangan
2016-04-19 12:52:01 +05:30
committed by Eduardo Valentin
parent 9e389e383b
commit b3aef78f76
3 changed files with 193 additions and 0 deletions
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10
drivers/thermal/Kconfig
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@@ -411,4 +411,14 @@ config QCOM_SPMI_TEMP_ALARM
real time die temperature if an ADC is present or an estimate of the
temperature based upon the over temperature stage value.
config GENERIC_ADC_THERMAL
tristate "Generic ADC based thermal sensor"
depends on IIO
help
This enabled a thermal sysfs driver for the temperature sensor
which is connected to the General Purpose ADC. The ADC channel
is read via IIO framework and the channel information is provided
to this driver. This driver reports the temperature by reading ADC
channel and converts it to temperature based on lookup table.
endif