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// SPDX-License-Identifier: GPL-2.0
/*
* USB Type-C Connector Class Port Mapping Utility
*
* Copyright (C) 2021, Intel Corporation
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
*/
#include <linux/acpi.h>
#include <linux/component.h>
#include "class.h"
static int typec_aggregate_bind(struct device *dev)
{
return component_bind_all(dev, NULL);
}
static void typec_aggregate_unbind(struct device *dev)
{
component_unbind_all(dev, NULL);
}
static const struct component_master_ops typec_aggregate_ops = {
.bind = typec_aggregate_bind,
.unbind = typec_aggregate_unbind,
};
struct each_port_arg {
struct typec_port *port;
struct component_match *match;
};
static int typec_port_compare(struct device *dev, void *fwnode)
{
return device_match_fwnode(dev, fwnode);
}
static int typec_port_match(struct device *dev, void *data)
{
struct acpi_device *adev = to_acpi_device(dev);
struct each_port_arg *arg = data;
struct acpi_device *con_adev;
con_adev = ACPI_COMPANION(&arg->port->dev);
if (con_adev == adev)
return 0;
if (con_adev->pld_crc == adev->pld_crc)
component_match_add(&arg->port->dev, &arg->match, typec_port_compare,
acpi_fwnode_handle(adev));
return 0;
}
int typec_link_ports(struct typec_port *con)
{
struct each_port_arg arg = { .port = con, .match = NULL };
bus_for_each_dev(&acpi_bus_type, NULL, &arg, typec_port_match);
/*
* REVISIT: Now each connector can have only a single component master.
* So far only the USB ports connected to the USB Type-C connector share
* the _PLD with it, but if there one day is something else (like maybe
* the DisplayPort ACPI device object) that also shares the _PLD with
* the connector, every one of those needs to have its own component
* master, because each different type of component needs to be bind to
* the connector independently of the other components. That requires
* improvements to the component framework. Right now you can only have
* one master per device.
*/
return component_master_add_with_match(&con->dev, &typec_aggregate_ops, arg.match);
}
void typec_unlink_ports(struct typec_port *con)
{
component_master_del(&con->dev, &typec_aggregate_ops);
}
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