linux-kernel - Re: [PATCH v2] usb: typec: Expose Product Type VDOs via sysfs

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Date:   Thu, 22 Oct 2020 11:18:49 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:USB NETWORKING DRIVERS" <linux-usb@...r.kernel.org>,
        Benson Leung <bleung@...omium.org>
Subject: Re: [PATCH v2] usb: typec: Expose Product Type VDOs via sysfs

Hi Heikki,

Thanks for your feedback.

On Thu, Oct 22, 2020 at 5:43 AM Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> On Thu, Oct 22, 2020 at 12:25:07AM -0700, Prashant Malani wrote:
> > Hi Greg,
> >
> > On Thu, Oct 22, 2020 at 12:17 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> > >
> > > Given that your current implementation is not acceptable, something has
> > > to change :)
> >
> > Got it. I'd like to see if Heikki has any suggestions on naming these
> > entries better.
>
> Why not have product type specific attribute files?
>
> So if the partner is UFP, then we expose ufp1 and ufp2 files that
> return the UFP1 and UFP2 VDO values and hide the other files:
>
>         % ls /sys/class/typec/port0-partner/identity/
>         id_header cert_stat product ufp1 ufp2
>
> If the partner is DFP, then you expose the dfp file and hide
> everything else:
>
>         % ls /sys/class/typec/port0-partner/identity/
>         id_header cert_stat product dfp
>
> And so on.
>

Makes sense, thanks! The only query I have here is , does the kernel
*need* to implement this logic? Userspace can read id_header VDO and
figure this on its own (parse the Product Type specific VDOs
accordingly).

Apart from that, I can work on implementing this if there are no concerns.

Best regards,

> thanks,
>
> --
> heikki