pwm-fan.rst (748B)
1Kernel driver pwm-fan 2===================== 3 4This driver enables the use of a PWM module to drive a fan. It uses the 5generic PWM interface thus it is hardware independent. It can be used on 6many SoCs, as long as the SoC supplies a PWM line driver that exposes 7the generic PWM API. 8 9Author: Kamil Debski <k.debski@samsung.com> 10 11Description 12----------- 13 14The driver implements a simple interface for driving a fan connected to 15a PWM output. It uses the generic PWM interface, thus it can be used with 16a range of SoCs. The driver exposes the fan to the user space through 17the hwmon's sysfs interface. 18 19The fan rotation speed returned via the optional 'fan1_input' is extrapolated 20from the sampled interrupts from the tachometer signal within 1 second.