[PATCH] add soundcard device and fix device_file handling

[Kay Sievers]

On 3/20/07, Danny Kukawka <danny.kukawka at web.de> wrote:
> On Dienstag, 20. März 2007, David Zeuthen wrote:
> > On Mon, 2007-03-19 at 15:41 +0100, Danny Kukawka wrote:
> > > * Add the sound card device to HAL (e.g. /sys/devices/pci*/*/card0) to
> > >   represent the correct sysfs structure. All alsa and oss devices are
> > >   now childs of the releated sound card device.
> >
> > Not on my box... does this require a new kernel / ALSA version or some
> > special configuration? What's the point here btw and what's with the new
> > sound.* properties? Perhaps explaining a bit more what you want to
> > change, how it's going to look (lshal snippts) and why would be a good
> > starting point... Thanks.
>
> Is there no /sys/devices/pci*/*/card0 device on your machine? What print
> 'ls -lha /sys/class/sound/' on your machine? IMO this should be part of the
> kernel with the new sysfs structure. IIRC it was not part of 2.6.18 but in
> 2.6.20 on my machines. At least it break nothing on older kernel versions.
>
> The (finally, if we depend on 2.6.20) goal is to add all card related information
> to the soundcard itself and not again and again to each single sound device
> (as e.g. alsa/oss.card and alsa/oss.card_id). Btw this would also reflect the
> real sysfs structure in the future.

That new layout shows up only with a kernel compiled with
!CONFIG_SYSFS_DEPRECATED. There will be no card-device, and no
card-information at all in sysfs, if you use the old sysfs layout, as
it does not allow to insert such devices into the tree.

Kay