Re: [linux-pm] [RFC] input: syfs switches for SKE keypad

Alan Stern
2010-10-06T16:19:13Z

On Wed, 6 Oct 2010, Dmitry Torokhov wrote:

> > I think this can be solved with pm_runtime, isn't it? Though I am not expert
> > at pm_runtime, but this framework can be explored to enable these features.
>
> I think last time Rafael mentioned that runtime PM did not allow for
> forcing power state from userspace but I wonder if it would be possible
> for userspace to signal and "accelerate" the idle state for a device and
> then standard runtime PM framework would kick in...

Yes; drivers can implement their runtime power policy any way they
want. For example, a driver could create a sysfs attribute file which
userspace could use to ask for changes in the power state.

The real question is whether the driver is platform-specific. If it is
then fine, it can do whatever it wants. If it isn't then it should
try to avoid doing things that are tied to a specific platform.

Alan Stern