platform, pnp and mmc bus

[Pierre Ossman]

I'm trying to make the necessary additions to HAL to allow it to detect 
mmc cards. This has proven to be a bit more work than I first thought.

Step 1:

The MMC cards reside on their own bus, so I need to add a new bus type. 
Using the other bus handlers in hal this wasn't too difficult.

Step 2:

Devices too deep in the sysfs structure are expected to have a parent 
already in the hal tree. This was not true for my mmc controller since 
it is a lpc device. So it seemed I had to fix that into the tree first.
Studying the platform bus handler I found that it is hardcoded to only 
accept floppy drives. A couple of if:s around critical sections and I 
got it accepting all platform devices.

This got it fairly up and running. I got the controller in the tree and 
mmc cards, including their block devices, were correctly detected.
Then I ran into some more problems. The driver can also be used in PNP 
mode, which means it shows up in the pnp bus. So I guess there'll be a:

Step 3:

Create a pnp bus handler.

Now for the actual questions. So far I've just been playing around to 
get my stuff working and it's a bit of a mess. Has anyone looked at 
these problems and perhaps already has a plan for handling them? 
Otherwise I could continue working on it and get a more clean version.

The pnp is also a problem. It doesn't really correspond to a physical 
bus (platform doesn't really either, but it's closer at least). But pnp 
devices are in every case I can think of, devices that belong on the 
platform bus. So should the pnp bus be a seperate bus in hal or should 
we try to group it with the platform bus?

Rgds
Pierre
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