[PATCH] sonypi: add fan and temperature status/control

[PATCH] sonypi: add fan and temperature status/control

1. FAN Status/Control: you can now get the fan status (running or not) and
   also set the fan speed (for <5 seconds only). The problem is that there
   is an auto regulator that kicks in within about 5 seconds after that to
   restart the fan if it is above a threshold temperature (39 Degree C in
   my Vaio). It is useful just to get the fan status (primarily). It also
   appears that you can change the speed by increasing the values (much
   like the LCD control) - there are effectively only about 6 speeds (it
   seems - not sure, but from what I've played with on my Vaio).

2. Temperature: you can get the current temperature (same as reported by
   ACPI). This is primarily useful for APM users (since ACPI already gives
   this). I have used this to detect when the fan comes on in my Vaio (39
   Degree C).

From: Narayanan R S <nars@kadamba.org>
Signed-off-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>