0001 Kernel driver pwm-fan
0002 =====================
0003
0004 This driver enables the use of a PWM module to drive a fan. It uses the
0005 generic PWM interface thus it is hardware independent. It can be used on
0006 many SoCs, as long as the SoC supplies a PWM line driver that exposes
0007 the generic PWM API.
0008
0009 Author: Kamil Debski <k.debski@samsung.com>
0010
0011 Description
0012 -----------
0013
0014 The driver implements a simple interface for driving a fan connected to
0015 a PWM output. It uses the generic PWM interface, thus it can be used with
0016 a range of SoCs. The driver exposes the fan to the user space through
0017 the hwmon's sysfs interface.
0018
0019 The fan rotation speed returned via the optional 'fan1_input' is extrapolated
0020 from the sampled interrupts from the tachometer signal within 1 second.
