[PATCH] Platform bus support

[David Zeuthen]

On Tue, 2005-08-23 at 23:06 +0200, Pierre Ossman wrote:
> Huh? Platform has been in the kernel for ages. At least since 2.6.9,
> probably since 2.6.0.

Yes.. but fixing the x86 floppy driver to give this

        [davidz at daxter ~]$ ls -l /sys/bus/platform/devices/floppy.0/
        total 0
        lrwxrwxrwx  1 root root 0 Aug 24 10:14 block -> ../../../block/fd0
        lrwxrwxrwx  1 root root 0 Aug 24 06:13 bus -> ../../../bus/platform
        drwxr-xr-x  2 root root 0 Aug 24 10:14 power
        [davidz at daxter ~]$
        

is a rather recent addition - an addition that allows us to treat the
x86 floppy drive like any other block device. So.. we just need to make
sure that the patch works with this too..

> I've found a machine to fiddle with. I has a floppy controller, but no
> floppy drive. But when I removed 'parent == NULL' from your hack I at
> least got:
> 
> 16124: 22:57:42.943: probe-pc-floppy.c:73: Checking if /dev/fd0 is
> actually present
> 16124: 22:57:42.945: probe-pc-floppy.c:88: floppy drive name is 'H1440'
> 16124: 22:57:43.633: probe-pc-floppy.c:96: floppy drive /dev/fd0 seems
> not to exist
> 
> It would seem some hacking is till needed since the platform information
> cannot provide any decent information about the actual device. Perhaps
> we could scan all block devices with the ioctl:s in probe-pc-floppy and
> use that?
> 
> 
> I have to run off now, but if you have some ideas on how to proceed I
> can continue this tomorrow.

I have a machine with a real floppy drive.. Send me a patch and I'll
test it!

Cheers,
David