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