On 12/03/2017 05:24 AM, Linus Walleij wrote:
Hi folks, This system: https://dflund.se/~triad/krad/dlink-dns-313/ Has: - 1 GPIO fan using drivers/hwmon/gpio-fan.c - 1 temperature sensor using drivers/hwmon/lm75.c So it is the simplest form of chassis cooling. Is it possible to use drivers/thermal to set up a policy for controlling the HWMON fan directly by reading the HWMON sensor input periodically?
Both register with the thermal subsystem, so I would think it should be possible, at least for devicetree enabled systems (the hwmon subsystem uses a devm function to register sensors with the thermal subsystem, and the only available devm function is devm_thermal_zone_of_sensor_register). Guenter
If not: should it be? It seems natural to me. I guess this stuff is normally "policy in userspace" but we already have thermal policies in the kernel, so... Yours, Linus Walleij
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