Config is inspired by thinkfan.
Example config:
# /etc/thonkfan.toml
# CPU temp sensor
thermal = '/sys/devices/platform/thinkpad_hwmon/hwmon/hwmon4/temp1_input'
# thinkpad_acpi fan interface
fan = '/proc/acpi/ibm/fan'
# [LEVEL, LOW, HIGH]
# LEVEL is the fan level to use (0-7 with thinkpad_acpi)
# LOW is the temperature at which to step down to the previous level
# HIGH is the temperature at which to step up to the next level
# All numbers are integers.
curve = [
[0, 0, 55],
[1, 48, 60],
[2, 50, 61],
[3, 52, 63],
[4, 56, 65],
[5, 59, 66],
[7, 63, 32767],
]