linux/drivers/platform/chrome/cros_typec_switch.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2022 Google LLC
 *
 * This driver provides the ability to configure Type-C muxes and retimers which are controlled by
 * the ChromeOS EC.
 */

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#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>

/* Handles and other relevant data required for each port's switches. */
struct cros_typec_port { … };

/* Driver-specific data. */
struct cros_typec_switch_data { … };

static int cros_typec_cmd_mux_set(struct cros_typec_switch_data *sdata, int port_num, u8 index,
				  u8 state)
{ … }

static int cros_typec_get_mux_state(unsigned long mode, struct typec_altmode *alt)
{ … }

static int cros_typec_send_clear_event(struct cros_typec_switch_data *sdata, int port_num,
				       u32 events_mask)
{ … }

static bool cros_typec_check_event(struct cros_typec_switch_data *sdata, int port_num, u32 mask)
{ … }

/*
 * The ChromeOS EC treats both mode-switches and retimers as "muxes" for the purposes of the
 * host command API. This common function configures and verifies the retimer/mode-switch
 * according to the provided setting.
 */
static int cros_typec_configure_mux(struct cros_typec_switch_data *sdata, int port_num, int index,
				    unsigned long mode, struct typec_altmode *alt)
{ … }

static int cros_typec_mode_switch_set(struct typec_mux_dev *mode_switch,
				      struct typec_mux_state *state)
{ … }

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

static void cros_typec_unregister_switches(struct cros_typec_switch_data *sdata)
{ … }

static int cros_typec_register_mode_switch(struct cros_typec_port *port,
					   struct fwnode_handle *fwnode)
{ … }

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

static int cros_typec_register_switches(struct cros_typec_switch_data *sdata)
{ … }

static int cros_typec_switch_probe(struct platform_device *pdev)
{ … }

static void cros_typec_switch_remove(struct platform_device *pdev)
{ … }

#ifdef CONFIG_ACPI
static const struct acpi_device_id cros_typec_switch_acpi_id[] = …;
MODULE_DEVICE_TABLE(acpi, cros_typec_switch_acpi_id);
#endif

static struct platform_driver cros_typec_switch_driver = …;

module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;