diff options
| author | Prashant Malani | 2020-11-16 12:11:40 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2020-11-18 12:55:46 +0100 |
| commit | a0ccdc4a77a1b36b682ae60361879eca0a0f88d6 (patch) | |
| tree | 87efac4589cad63f175e81b86171b315b9f7756b /Documentation | |
| parent | 8a5ca78f603977d6b9b2d7dcb3b1b6ef601d3cc7 (diff) | |
usb: typec: Add number of altmodes partner attr
Add a user-visible attribute for the number of alternate modes available
in a partner. This allows userspace to determine whether there are any
remaining alternate modes left to be registered by the kernel driver. It
can begin executing any policy state machine after all available
alternate modes have been registered with the connector class framework.
This value is set to "-1" initially, signifying that a valid number of
alternate modes haven't been set for the partner.
Also add a sysfs file which exposes this attribute. The file remains
hidden as long as the attribute value is -1.
Cc: Benson Leung <bleung@chromium.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201116201150.2919178-3-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-typec | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec index b7794e02ad20..a195247d83ee 100644 --- a/Documentation/ABI/testing/sysfs-class-typec +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -139,6 +139,14 @@ Description: Shows if the partner supports USB Power Delivery communication: Valid values: yes, no +What: /sys/class/typec/<port>-partner/number_of_alternate_modes +Date: November 2020 +Contact: Prashant Malani <pmalani@chromium.org> +Description: + Shows the number of alternate modes which are advertised by the partner + during Power Delivery discovery. This file remains hidden until a value + greater than or equal to 0 is set by Type C port driver. + What: /sys/class/typec/<port>-partner>/identity/ Date: April 2017 Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> |