lkml.org 
[lkml]   [2016]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv4 1/2] usb: USB Type-C connector class
On Wed, Jun 29, 2016 at 04:38:37PM +0300, Heikki Krogerus wrote:
> The purpose of USB Type-C connector class is to provide
> unified interface for the user space to get the status and
> basic information about USB Type-C connectors on a system,
> control over data role swapping, and when the port supports
> USB Power Delivery, also control over power role swapping
> and Alternate Modes.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> ---
[ ... ]

> +
> +What: /sys/class/typec/<port>-partner/supports_usb_power_delivery
> +Date: June 2016
> +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> +Description:
> + Shows if the partner supports USB Power Delivery.
> + - 1 if USB Power Delivery is supported
> + - 0 when it's not
> +
> +
> +What: /sys/class/typec/<port>-partner/id_header_vdo
> +Date: June 2016
> +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> +Description:
> + If the partner supports USB Power Deliver, shows the VDO
> + returned from Discover Identity USB Power Delivery command.
> +
> + If the partner does not support USB Power Delivery, the
> + attribute is hidden.
> +
On second thought, and after merging the code (and realizing that I don't get
the raw data from the Type-C Port Manager), I am not sure if a raw attribute
is that useful here. It also doesn't provide all information either.

Would it make sense to split it into multiple decoded attributes ?

- vendor-id
[bit 0..15 of ID header VDO]
- product-type (undefined, hub, peripheral, alternate mode adapter for ufp;
passive/active for cable plugs)
Might map into typec_partner_type, but I don't see a 1:1 match.
[bit 27..29 of ID header VDO]
- alternate-mode-supported
[bit 26 of ID header VDO]
- capabilities (ufp, dfp, drp, none (?))
[bit 30/31 of ID header VDO]
- product-id
[bit 16..31 of Product VDO]

Does this make any sense ?

Thanks,
Guenter

\
 
 \ /
  Last update: 2016-06-30 20:01    [W:1.919 / U:4.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site