A Linux userspace tool to read Apple SMC keys. Supports various data types and output formats. This tool is a part of the coreboot project.

-h, --help:         print help
-k, --key <name>:   key name
-t, --type <type>:  data type, see below

--output-hex:  print value as a hexadecimal number
--output-bin:  print binary representation

ui8, ui16, ui32, si8, si16, flag, fpXY, spXY

fp and sp are unsigned and signed fixed point data types respectively. The X in fp and sp data types is integer bits count and Y is fraction bits count.

For example: fpe2 means 14 integer bits, 2 fraction bits, sp78 means 7 integer bits, 8 fraction bits (and one sign bit).

Reading battery level:

smctool -k B0FC -t ui16  # returns Full Capacity of Battery 0
smctool -k B0RM -t ui16  # returns Remaining Capacity of Batery 0

Reading fan speed:

smctool -k F0Ac -t fpe2

GPLv2