Here is a general pwm support cleanup patch for the w83781d chip driver.
Featuring:

* Don't pretend that we handle PWM on AS99127F chips. We don't know how
it works, and one of the register we are accessing for now is clearly
not a PWM register, and changing its value usually breaks temperature
readings.

* Discard irrelevant comments.

* Rewrite show_pwmenable_reg. It was obviously taken from the 2.4
driver, with unneeded tests and the code was much too complicated
anyway. And now we handle errors correctly.

* Initialize pwm_enable at load time. So far it was done conditionally
(if init=1) while it should always be done. And pwm2_enable wasn't read
from the chip, while it should.

I could test that my AS99127F doesn't expose pwm files through ssysfs
anymore. Which means that I couldn't test the rest of the pwm changes,
unfortunately.

I've applied similar changes to our 2.4/CVS repository.