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usb: typec: More API for cable handling

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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: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20191230142611.24921-4-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-12-30 17:25:59 +03:00 committed by Greg Kroah-Hartman
parent 8face9aa57
commit b66b40ee7d
2 changed files with 50 additions and 0 deletions
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46
drivers/usb/typec/class.c
View File

@ -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

4
include/linux/usb/typec.h
View File

@ -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);