[PATCH linux 2/6] hwmon: occ: Add sysfs interface

[Andrew Jeffery]

On Tue, 2017-01-03 at 19:13 -0500, Brad Bishop wrote:
> > > > On Jan 3, 2017, at 7:06 PM, Joel Stanley <joel at jms.id.au> wrote:
> > 
> > On Wed, Jan 4, 2017 at 10:49 AM, Brad Bishop
> > > > <bradleyb at fuzziesquirrel.com> wrote:
> > > What if the driver is built into the kernel?  Is there such a thing as module only drivers?
> > 
> > Our kernel is build with module loading disabled at present.
> > 
> > modprobing the driver when userspace is ready is a neat hack that we
> > could use for now. However, the driver will need a mechanism that
> 
> Do you happen to know if ‘a mechanism’ is something that needs to be invented or 
> if Linux already has something?

I spoke with Rusty about this and by his response there's no existing
"event-bus" mechanism. His suggestions for the problem were:

1. As userspace is coordinating the host power-on, do the modprobe in
userspace

2. Push the power-on logic into the kernel so it can trigger hotplug
events to probe the drivers, and expose a power-{on,off}/{soft,hard}-
reboot interface to userspace.

Andrew

> 
> > tells it to bind to the hardware when it becomes available. The same
> > mechanism would be useful for the fsi driver to initiate a scan and
> > bind it's client drivers.
> > 
> > Cheers,
> > 
> > Joel
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