linux-kernel - Re: [RFC PATCH 2/3] usb: typec: Add product_type sysfs attribute file for partners and cables

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Date:   Wed, 18 Nov 2020 16:57:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] usb: typec: Add product_type sysfs attribute
 file for partners and cables

On Wed, Nov 18, 2020 at 06:00:58PM +0300, Heikki Krogerus wrote:
> USB Power Delivery Specification defines a set of product
> types for partners and cables. The product type is defined
> in the ID Header VDO, which is the first object in the
> response to the Discover Identity command.
> 
> This sysfs attribute file is only created for the partners
> and cables if the product type is really known in the
> driver. Some interfaces do not give access to the Discover
> Identity response from the partner or cable, but they may
> still supply the product type separately in some cases.
> 
> When the product type of the partner or cable is detected,
> uevent is also raised with PRODUCT_TYPE set to show the
> actual product type (for example PRODUCT_TYPE=host).
> 
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  Documentation/ABI/testing/sysfs-class-typec |  55 ++++++++
>  drivers/usb/typec/class.c                   | 132 ++++++++++++++++++--
>  2 files changed, 180 insertions(+), 7 deletions(-)

Seems semi-sane, nice work :)

greg k-h