Commit f5434e30 authored by Prashant Malani's avatar Prashant Malani Committed by Greg Kroah-Hartman
Browse files

platform/chrome: cros_typec_switch: Register mode switches 



Register mode switch devices for Type C connectors, when they are
specified by firmware. These control Type C configuration for any USB
Type-C mode switches (sometimes known as "muxes") which are controlled
by the Chrome EC.

Signed-off-by: default avatarPrashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20220711072333.2064341-8-pmalani@chromium.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bb53ad95

drivers/platform/chrome/cros_typec_switch.c

+40 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/platform_device.h>

#include <linux/usb/typec_altmode.h>

#include <linux/usb/typec_dp.h>

#include <linux/usb/typec_mux.h>

#include <linux/usb/typec_retimer.h>



#define DRV_NAME "cros-typec-switch"
@@ -22,6 +23,7 @@ 
/* Handles and other relevant data required for each port's switches. */

struct cros_typec_port {

	int port_num;

	struct typec_mux_dev *mode_switch;

	struct typec_retimer *retimer;

	struct cros_typec_switch_data *sdata;

};
@@ -147,6 +149,15 @@ static int cros_typec_configure_mux(struct cros_typec_switch_data *sdata, int po 
	return -ETIMEDOUT;

}



static int cros_typec_mode_switch_set(struct typec_mux_dev *mode_switch,

				      struct typec_mux_state *state)

{

	struct cros_typec_port *port = typec_mux_get_drvdata(mode_switch);



	/* Mode switches have index 0. */

	return cros_typec_configure_mux(port->sdata, port->port_num, 0, state->mode, state->alt);

}



static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)

{

	struct cros_typec_port *port = typec_retimer_get_drvdata(retimer);
@@ -163,9 +174,27 @@ static void cros_typec_unregister_switches(struct cros_typec_switch_data *sdata) 
		if (!sdata->ports[i])

			continue;

		typec_retimer_unregister(sdata->ports[i]->retimer);

		typec_mux_unregister(sdata->ports[i]->mode_switch);

	}

}



static int cros_typec_register_mode_switch(struct cros_typec_port *port,

					   struct fwnode_handle *fwnode)

{

	struct typec_mux_desc mode_switch_desc = {

		.fwnode = fwnode,

		.drvdata = port,

		.name = fwnode_get_name(fwnode),

		.set = cros_typec_mode_switch_set,

	};



	port->mode_switch = typec_mux_register(port->sdata->dev, &mode_switch_desc);

	if (IS_ERR(port->mode_switch))

		return PTR_ERR(port->mode_switch);



	return 0;

}



static int cros_typec_register_retimer(struct cros_typec_port *port, struct fwnode_handle *fwnode)

{

	struct typec_retimer_desc retimer_desc = {
@@ -235,6 +264,17 @@ static int cros_typec_register_switches(struct cros_typec_switch_data *sdata) 
		}



		dev_dbg(dev, "Retimer switch registered for index %llu\n", index);



		if (!fwnode_property_read_bool(fwnode, "mode-switch"))

			continue;



		ret = cros_typec_register_mode_switch(port, fwnode);

		if (ret) {

			dev_err(dev, "Mode switch register failed\n");

			goto err_switch;

		}



		dev_dbg(dev, "Mode switch registered for index %llu\n", index);

	}



	return 0;