Commit b66b40ee authored by Heikki Krogerus's avatar Heikki Krogerus Committed by Greg Kroah-Hartman
Browse files

usb: typec: More API for cable handling 



Thunderbolt 3, and probable USB4 too, will need to be able
to get details about the cables. Adding typec_cable_get()
function that the alternate mode drivers can use to gain
access to gain access to the cable.

Signed-off-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20191230142611.24921-4-heikki.krogerus@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8face9aa

drivers/usb/typec/class.c

+46 −0
Original line number Diff line number Diff line
@@ -834,6 +834,52 @@ static const struct device_type typec_cable_dev_type = { 
	.release = typec_cable_release,

};



static int cable_match(struct device *dev, void *data)

{

	return is_typec_cable(dev);

}



/**

 * typec_cable_get - Get a reference to the USB Type-C cable

 * @port: The USB Type-C Port the cable is connected to

 *

 * The caller must decrement the reference count with typec_cable_put() after

 * use.

 */

struct typec_cable *typec_cable_get(struct typec_port *port)

{

	struct device *dev;



	dev = device_find_child(&port->dev, NULL, cable_match);

	if (!dev)

		return NULL;



	return to_typec_cable(dev);

}

EXPORT_SYMBOL_GPL(typec_cable_get);



/**

 * typec_cable_get - Decrement the reference count on USB Type-C cable

 * @cable: The USB Type-C cable

 */

void typec_cable_put(struct typec_cable *cable)

{

	put_device(&cable->dev);

}

EXPORT_SYMBOL_GPL(typec_cable_put);



/**

 * typec_cable_is_active - Check is the USB Type-C cable active or passive

 * @cable: The USB Type-C Cable

 *

 * Return 1 if the cable is active or 0 if it's passive.

 */

int typec_cable_is_active(struct typec_cable *cable)

{

	return cable->active;

}

EXPORT_SYMBOL_GPL(typec_cable_is_active);



/**

 * typec_cable_set_identity - Report result from Discover Identity command

 * @cable: The cable updated identity values

include/linux/usb/typec.h

+4 −0
Original line number Diff line number Diff line
@@ -230,6 +230,10 @@ struct typec_cable *typec_register_cable(struct typec_port *port, 
					 struct typec_cable_desc *desc);

void typec_unregister_cable(struct typec_cable *cable);



struct typec_cable *typec_cable_get(struct typec_port *port);

void typec_cable_put(struct typec_cable *cable);

int typec_cable_is_active(struct typec_cable *cable);



struct typec_plug *typec_register_plug(struct typec_cable *cable,

				       struct typec_plug_desc *desc);

void typec_unregister_plug(struct typec_plug *plug);