usb: typec: Add number of altmodes partner attr

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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>

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Prashant Malani 2020-11-16 12:11:40 -08:00 • committed by Greg Kroah-Hartman

parent 8a5ca78f60

commit a0ccdc4a77

3 changed files with 74 additions and 1 deletions

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8

Documentation/ABI/testing/sysfs-class-typec

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66

drivers/usb/typec/class.c

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1

include/linux/usb/typec.h

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