[linux-dvb] Re: refactoring

[Holger Waechtler <holger@qanu.de>]

Johannes Stezenbach wrote:

> On Mon, Oct 11, 2004 at 11:53:31AM +0200, Gerd Knorr wrote:
>  
> > I think Andrew wrote this:
> >    
> > > Any frontend configuration files/power management stuff is then
> > > attached to those entries so that the card can bring up the frontend
> > > in its entirety in one go. This also allows for frontends attached to
> > > proprietary weirdy buses that have no standard kernel representation.
> > >      
> > Wrong approach.  The powermanagement doesn't care about the /dev/class
> > tree (where you register the frontend (unix) device), it walks the
> > physical devices below /dev/devices.  And that is one of the reasons why
> > I think it is a good idea to have the i2c devices in the (physical)
> > device tree.
> >    
> Well, if the i2c bus and the devices on the bus aren't exposed
> at all in sysfs, then the DVB adapter driver could take care
> of it when called via PCI bus power management hooks. I don't
> think this is a good design, but it would work for PCI cards.
>  
It works for all implementations, all device classes have these hooks: 
USB, PCI, whatever.

> What I'm worried about is how this would work on embedded STBs
> where the i2c bus driver *is* implemented via kernel i2c, and
> we can't change that because there are lots of other devices
> on the bus.
>  
Simply implement a device class for your STB, as part of your Board 
Support Package.

Holger