+/sys files
+----------
+The sysfs-interface is documented in the 'sysfs-interface' file. Only
+chip-specific options are documented here.
+
+pwm[1-3]_enable - this file controls mode of fan/temperature control for
+ fan 1-3. Fan/PWM 4-5 only support manual mode.
+ * 1 Manual mode
+ * 2 Thermal Cruise mode
+ * 3 Fan Speed Cruise mode (no further support)
+
+temp[1-3]_target - defines the target temperature for Thermal Cruise mode.
+ Unit: millidegree Celsius
+ RW
+
+temp[1-3]_tolerance - temperature tolerance for Thermal Cruise mode.
+ Specifies an interval around the target temperature
+ in which the fan speed is not changed.
+ Unit: millidegree Celsius
+ RW
+