[PATCH v3 0/2] Support temperature trips by HWMON core and LM90 driver

Dmitry Osipenko
2021-06-21T18:41:19Z

Hi,

It's typical for embedded devices to use LM90-compatible sensor for
monitoring of CPU core and skin temperatures. The sensor is often
used by thermal zone that performs passive cooling and emergency
shutdown on overheat, hence it's more optimal to use interrupt for
a faster notification about temperature changes. Thermal framework
provides set_trips() callback for programming of temperature trips,
let's support it by HWMON.

Changelog:

v3: - Improved patch that fixes integer overflows by fixing the hysteresis
underflow and improving the commit message, telling that min/max/crit
fixes are only related to the LM99 sensor. Thanks to Guenter Roeck
for the suggestion.

v2: - Reworked set_trips() by making it generic. Now callback invokes
the min/max temperature write method directly, instead of using
additional new hwmon callback. This was suggested by Guenter Roeck.

- Added new patch that fixes integer overflows in the LM90 driver.
The fixes are necessary for supporting set_trips().

Dmitry Osipenko (2):
hwmon: (lm90) Prevent integer underflows of temperature calculations
hwmon: Support set_trips() of thermal device ops

drivers/hwmon/hwmon.c | 32 ++++++++++++++++++++++++++++++++
drivers/hwmon/lm90.c | 9 +++++++++
2 files changed, 41 insertions(+)

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2.30.2