fan.rb

gistfile1.txt

#! /usr/bin/ruby
# SMC fan control tool
# Benjamin Roberts
# Assumes `smc` is in your path (bundled with smcFanControl)

SMC_KEY="F0Mx"
SMC_FAN_MAX=6200
SMC_FAN_MAX_KEY=0x60e0
FAN_MIN=1500

def usage(ret_val)
	puts "fan.rb (#{FAN_MIN}-#{SMC_FAN_MAX})"
	exit ret_val
end

if ARGV.length != 1
	usage 1
end

fan_speed = ARGV[0].to_i

if fan_speed > SMC_FAN_MAX or fan_speed < FAN_MIN
	usage 1
end

smc_value = (SMC_FAN_MAX_KEY * fan_speed / SMC_FAN_MAX).to_s(16)

puts "setting fan to #{fan_speed}rpm (#{SMC_KEY}=>#{smc_value})"

`smc -k #{SMC_KEY} -w #{smc_value}`

exit 0