@@ -20,13 +20,13 @@ Date: April 2017
Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Description:
The supported power roles. This attribute can be used to request
- power role swap on the port when the port supports USB Power
- Delivery. Swapping is supported as synchronous operation, so
- write(2) to the attribute will not return until the operation
- has finished. The attribute is notified about role changes so
- that poll(2) on the attribute wakes up. Change on the role will
- also generate uevent KOBJ_CHANGE. The current role is show in
- brackets, for example "[source] sink" when in source mode.
+ power role swap on the port. Swapping is supported as
+ synchronous operation, so write(2) to the attribute will not
+ return until the operation has finished. The attribute is
+ notified about role changes so that poll(2) on the attribute
+ wakes up. Change on the role will also generate uevent
+ KOBJ_CHANGE. The current role is show in brackets, for example
+ "[source] sink" when in source mode.
Valid values: source, sink
@@ -1287,7 +1287,6 @@ static umode_t typec_attr_is_visible(struct kobject *kobj,
return 0444;
} else if (attr == &dev_attr_power_role.attr) {
if (port->cap->type != TYPEC_PORT_DRP ||
- !port->cap->pd_revision ||
!port->ops || !port->ops->pr_set)
return 0444;
} else if (attr == &dev_attr_vconn_source.attr) {
Even though originally the USB Type-C Specification did not describe the steps for power role swapping without USB PD contract in place, it did not actually mean power role swap without USB PD was not allowed. The USB Type-C Specification did not clearly separate the data and power roles until in the release 1.2 which is why there also were no clear steps for the scenario where only the power role was swapped without USB PD contract before that. Since in the latest version of the specification the power role swap without USB PD is now clearly mentioned as allowed operation, removing the check that prevented power role swap without USB PD support. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> --- Documentation/ABI/testing/sysfs-class-typec | 14 +++++++------- drivers/usb/typec/class.c | 1 - 2 files changed, 7 insertions(+), 8 deletions(-)