[PATCH] ALSA: core - add more card sysfs entries

[Mark Brown]

On Thu, Apr 08, 2021 at 09:12:57AM -0500, Pierre-Louis Bossart wrote:
> On 4/8/21 8:18 AM, Takashi Iwai wrote:

> > I guess the question here is how to identify the proper profile for a
> > certain platform and how to get it passed over the whole system.
> > Theoretically, the rename of the card name or mixer name strings could
> > be done in user-space side, too (e.g. mapping in alsa-lib or
> > whatever), so I don't think it mandatory to make them variable via
> > sysfs, if it's meant only for the consistency reason.

> > Didn't we discuss in the past about the possibility to store the
> > profile name in the card component string?

> Because of OEM or user customization, we will have multiple versions of
> firmware and topology that will have to be enabled in specific setting. The
> last thing we want is hard-coded rules in the kernel on which firmware
> customization to use for which platform.

...

> If the users wipes the OEM image and installs a standard distribution on the
> same device, they would by default use the firmware generated from the SOF
> main branch, without any differentiation and 3rd party IP.

> So the point is: how do we expose this information to UCM? In the machine
> driver where the card is created? There is zero information on what the
> firmware/topology does. The information can only be extracted when the
> topology is loaded when probing the SOF component driver.

So what we're looking for here is a mechanism to tell userspace what
firmware has been loaded?
> 
> I don't think the point was to rewrite the controls but make sure that UCM
> is aware that the card definition was changed by a different selection of
> firmware.
> 
> Jaroslav, please correct me if I misunderstood the intent of this patch!
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: not available
URL: <http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20210408/54bda174/attachment.sig>