This needs to be all handled in the kernel. User space can only get status. We'd love to see this code.
On Mon, Nov 29, 2010 at 03:23:58PM +0100, Christopher Zimmermann wrote: > Hi! > > I'd like to implement fan speed control for Thinkpads. It is documented > at http://www.thinkwiki.org/wiki/How_to_control_fan_speed#Hardware_specs > and linux also implements this (but with special case for TP 570, > 600e/x, 770e, 770x - anyone here with access to one of these?) > Implementing a driver for this will be a piece of cake, but I need help > with communication to userspace to get started. I guess the way to go is > sysctl (?) > In acpithinkpad only read only sensor variables are created. > How do I create r/w variables - where can I find code examples? And where > in the sysctl tree should I put them? > > When I have this working I want to implement a PID controler for it. > Since I'd like to see this get committed, where would be the preferred > place to put the PID-controller? Kernel or userland? > > > Christopher
