drivers/usb/typec/wusb3801.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Willsemi WUSB3801 Type-C port controller driver
  *
  * Copyright (C) 2022 Samuel Holland <samuel@sholland.org>
  */

 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/usb/typec.h>

 #define WUSB3801_REG_DEVICE_ID		0x01
 #define WUSB3801_REG_CTRL0		0x02
 #define WUSB3801_REG_INT		0x03
 #define WUSB3801_REG_STAT		0x04
 #define WUSB3801_REG_CTRL1		0x05
 #define WUSB3801_REG_TEST00		0x06
 #define WUSB3801_REG_TEST01		0x07
 #define WUSB3801_REG_TEST02		0x08
 #define WUSB3801_REG_TEST03		0x09
 #define WUSB3801_REG_TEST04		0x0a
 #define WUSB3801_REG_TEST05		0x0b
 #define WUSB3801_REG_TEST06		0x0c
 #define WUSB3801_REG_TEST07		0x0d
 #define WUSB3801_REG_TEST08		0x0e
 #define WUSB3801_REG_TEST09		0x0f
 #define WUSB3801_REG_TEST0A		0x10
 #define WUSB3801_REG_TEST0B		0x11
 #define WUSB3801_REG_TEST0C		0x12
 #define WUSB3801_REG_TEST0D		0x13
 #define WUSB3801_REG_TEST0E		0x14
 #define WUSB3801_REG_TEST0F		0x15
 #define WUSB3801_REG_TEST10		0x16
 #define WUSB3801_REG_TEST11		0x17
 #define WUSB3801_REG_TEST12		0x18

 #define WUSB3801_DEVICE_ID_VERSION_ID	GENMASK(7, 3)
 #define WUSB3801_DEVICE_ID_VENDOR_ID	GENMASK(2, 0)

 #define WUSB3801_CTRL0_DIS_ACC_SUPPORT	BIT(7)
 #define WUSB3801_CTRL0_TRY		GENMASK(6, 5)
 #define WUSB3801_CTRL0_TRY_NONE		(0x0 << 5)
 #define WUSB3801_CTRL0_TRY_SNK		(0x1 << 5)
 #define WUSB3801_CTRL0_TRY_SRC		(0x2 << 5)
 #define WUSB3801_CTRL0_CURRENT		GENMASK(4, 3) /* SRC */
 #define WUSB3801_CTRL0_CURRENT_DEFAULT	(0x0 << 3)
 #define WUSB3801_CTRL0_CURRENT_1_5A	(0x1 << 3)
 #define WUSB3801_CTRL0_CURRENT_3_0A	(0x2 << 3)
 #define WUSB3801_CTRL0_ROLE		GENMASK(2, 1)
 #define WUSB3801_CTRL0_ROLE_SNK		(0x0 << 1)
 #define WUSB3801_CTRL0_ROLE_SRC		(0x1 << 1)
 #define WUSB3801_CTRL0_ROLE_DRP		(0x2 << 1)
 #define WUSB3801_CTRL0_INT_MASK		BIT(0)

 #define WUSB3801_INT_ATTACHED		BIT(0)
 #define WUSB3801_INT_DETACHED		BIT(1)

 #define WUSB3801_STAT_VBUS_DETECTED	BIT(7)
 #define WUSB3801_STAT_CURRENT		GENMASK(6, 5) /* SNK */
 #define WUSB3801_STAT_CURRENT_STANDBY	(0x0 << 5)
 #define WUSB3801_STAT_CURRENT_DEFAULT	(0x1 << 5)
 #define WUSB3801_STAT_CURRENT_1_5A	(0x2 << 5)
 #define WUSB3801_STAT_CURRENT_3_0A	(0x3 << 5)
 #define WUSB3801_STAT_PARTNER		GENMASK(4, 2)
 #define WUSB3801_STAT_PARTNER_STANDBY	(0x0 << 2)
 #define WUSB3801_STAT_PARTNER_SNK	(0x1 << 2)
 #define WUSB3801_STAT_PARTNER_SRC	(0x2 << 2)
 #define WUSB3801_STAT_PARTNER_AUDIO	(0x3 << 2)
 #define WUSB3801_STAT_PARTNER_DEBUG	(0x4 << 2)
 #define WUSB3801_STAT_ORIENTATION	GENMASK(1, 0)
 #define WUSB3801_STAT_ORIENTATION_NONE	(0x0 << 0)
 #define WUSB3801_STAT_ORIENTATION_CC1	(0x1 << 0)
 #define WUSB3801_STAT_ORIENTATION_CC2	(0x2 << 0)
 #define WUSB3801_STAT_ORIENTATION_BOTH	(0x3 << 0)

 #define WUSB3801_CTRL1_SM_RESET		BIT(0)

 #define WUSB3801_TEST01_VENDOR_SUB_ID	(BIT(8) | BIT(6))

 #define WUSB3801_TEST02_FORCE_ERR_RCY	BIT(8)

 #define WUSB3801_TEST0A_WAIT_VBUS	BIT(5)

 struct wusb3801 {
 	struct typec_capability	cap;
 	struct device		*dev;
 	struct typec_partner	*partner;
 	struct typec_port	*port;
 	struct regmap		*regmap;
 	struct regulator	*vbus_supply;
 	unsigned int		partner_type;
 	enum typec_port_type	port_type;
 	enum typec_pwr_opmode	pwr_opmode;
 	bool			vbus_on;
 };

 static enum typec_role wusb3801_get_default_role(struct wusb3801 *wusb3801)
 {
 	switch (wusb3801->port_type) {
 	case TYPEC_PORT_SRC:
 		return TYPEC_SOURCE;
 	case TYPEC_PORT_SNK:
 		return TYPEC_SINK;
 	case TYPEC_PORT_DRP:
 	default:
 		if (wusb3801->cap.prefer_role == TYPEC_SOURCE)
 			return TYPEC_SOURCE;
 		return TYPEC_SINK;
 	}
 }

 static int wusb3801_map_port_type(enum typec_port_type type)
 {
 	switch (type) {
 	case TYPEC_PORT_SRC:
 		return WUSB3801_CTRL0_ROLE_SRC;
 	case TYPEC_PORT_SNK:
 		return WUSB3801_CTRL0_ROLE_SNK;
 	case TYPEC_PORT_DRP:
 	default:
 		return WUSB3801_CTRL0_ROLE_DRP;
 	}
 }

 static int wusb3801_map_pwr_opmode(enum typec_pwr_opmode mode)
 {
 	switch (mode) {
 	case TYPEC_PWR_MODE_USB:
 	default:
 		return WUSB3801_CTRL0_CURRENT_DEFAULT;
 	case TYPEC_PWR_MODE_1_5A:
 		return WUSB3801_CTRL0_CURRENT_1_5A;
 	case TYPEC_PWR_MODE_3_0A:
 		return WUSB3801_CTRL0_CURRENT_3_0A;
 	}
 }

 static unsigned int wusb3801_map_try_role(int role)
 {
 	switch (role) {
 	case TYPEC_NO_PREFERRED_ROLE:
 	default:
 		return WUSB3801_CTRL0_TRY_NONE;
 	case TYPEC_SINK:
 		return WUSB3801_CTRL0_TRY_SNK;
 	case TYPEC_SOURCE:
 		return WUSB3801_CTRL0_TRY_SRC;
 	}
 }

 static enum typec_orientation wusb3801_unmap_orientation(unsigned int status)
 {
 	switch (status & WUSB3801_STAT_ORIENTATION) {
 	case WUSB3801_STAT_ORIENTATION_NONE:
 	case WUSB3801_STAT_ORIENTATION_BOTH:
 	default:
 		return TYPEC_ORIENTATION_NONE;
 	case WUSB3801_STAT_ORIENTATION_CC1:
 		return TYPEC_ORIENTATION_NORMAL;
 	case WUSB3801_STAT_ORIENTATION_CC2:
 		return TYPEC_ORIENTATION_REVERSE;
 	}
 }

 static enum typec_pwr_opmode wusb3801_unmap_pwr_opmode(unsigned int status)
 {
 	switch (status & WUSB3801_STAT_CURRENT) {
 	case WUSB3801_STAT_CURRENT_STANDBY:
 	case WUSB3801_STAT_CURRENT_DEFAULT:
 	default:
 		return TYPEC_PWR_MODE_USB;
 	case WUSB3801_STAT_CURRENT_1_5A:
 		return TYPEC_PWR_MODE_1_5A;
 	case WUSB3801_STAT_CURRENT_3_0A:
 		return TYPEC_PWR_MODE_3_0A;
 	}
 }

 static int wusb3801_try_role(struct typec_port *port, int role)
 {
 	struct wusb3801 *wusb3801 = typec_get_drvdata(port);

 	return regmap_update_bits(wusb3801->regmap, WUSB3801_REG_CTRL0,
 				  WUSB3801_CTRL0_TRY,
 				  wusb3801_map_try_role(role));
 }

 static int wusb3801_port_type_set(struct typec_port *port,
 				  enum typec_port_type type)
 {
 	struct wusb3801 *wusb3801 = typec_get_drvdata(port);
 	int ret;

 	ret = regmap_update_bits(wusb3801->regmap, WUSB3801_REG_CTRL0,
 				 WUSB3801_CTRL0_ROLE,
 				 wusb3801_map_port_type(type));
 	if (ret)
 		return ret;

 	wusb3801->port_type = type;

 	return 0;
 }

 static const struct typec_operations wusb3801_typec_ops = {
 	.try_role	= wusb3801_try_role,
 	.port_type_set	= wusb3801_port_type_set,
 };

 static int wusb3801_hw_init(struct wusb3801 *wusb3801)
 {
 	return regmap_write(wusb3801->regmap, WUSB3801_REG_CTRL0,
 			    wusb3801_map_try_role(wusb3801->cap.prefer_role) |
 			    wusb3801_map_pwr_opmode(wusb3801->pwr_opmode) |
 			    wusb3801_map_port_type(wusb3801->port_type));
 }

 static void wusb3801_hw_update(struct wusb3801 *wusb3801)
 {
 	struct typec_port *port = wusb3801->port;
 	struct device *dev = wusb3801->dev;
 	unsigned int partner_type, status;
 	int ret;

 	ret = regmap_read(wusb3801->regmap, WUSB3801_REG_STAT, &status);
 	if (ret) {
 		dev_warn(dev, "Failed to read port status: %d\n", ret);
 		status = 0;
 	}
 	dev_dbg(dev, "status = 0x%02x\n", status);

 	partner_type = status & WUSB3801_STAT_PARTNER;

 	if (partner_type == WUSB3801_STAT_PARTNER_SNK) {
 		if (!wusb3801->vbus_on) {
 			ret = regulator_enable(wusb3801->vbus_supply);
 			if (ret)
 				dev_warn(dev, "Failed to enable VBUS: %d\n", ret);
 			wusb3801->vbus_on = true;
 		}
 	} else {
 		if (wusb3801->vbus_on) {
 			regulator_disable(wusb3801->vbus_supply);
 			wusb3801->vbus_on = false;
 		}
 	}

 	if (partner_type != wusb3801->partner_type) {
 		struct typec_partner_desc desc = {};
 		enum typec_data_role data_role;
 		enum typec_role pwr_role = wusb3801_get_default_role(wusb3801);

 		switch (partner_type) {
 		case WUSB3801_STAT_PARTNER_STANDBY:
 			break;
 		case WUSB3801_STAT_PARTNER_SNK:
 			pwr_role = TYPEC_SOURCE;
 			break;
 		case WUSB3801_STAT_PARTNER_SRC:
 			pwr_role = TYPEC_SINK;
 			break;
 		case WUSB3801_STAT_PARTNER_AUDIO:
 			desc.accessory = TYPEC_ACCESSORY_AUDIO;
 			break;
 		case WUSB3801_STAT_PARTNER_DEBUG:
 			desc.accessory = TYPEC_ACCESSORY_DEBUG;
 			break;
 		}

 		if (wusb3801->partner) {
 			typec_unregister_partner(wusb3801->partner);
 			wusb3801->partner = NULL;
 		}

 		if (partner_type != WUSB3801_STAT_PARTNER_STANDBY) {
 			wusb3801->partner = typec_register_partner(port, &desc);
 			if (IS_ERR(wusb3801->partner))
 				dev_err(dev, "Failed to register partner: %ld\n",
 					PTR_ERR(wusb3801->partner));
 		}

 		data_role = pwr_role == TYPEC_SOURCE ? TYPEC_HOST : TYPEC_DEVICE;
 		typec_set_data_role(port, data_role);
 		typec_set_pwr_role(port, pwr_role);
 		typec_set_vconn_role(port, pwr_role);
 	}

 	typec_set_pwr_opmode(wusb3801->port,
 			     partner_type == WUSB3801_STAT_PARTNER_SRC
 				? wusb3801_unmap_pwr_opmode(status)
 				: wusb3801->pwr_opmode);
 	typec_set_orientation(wusb3801->port,
 			      wusb3801_unmap_orientation(status));

 	wusb3801->partner_type = partner_type;
 }

 static irqreturn_t wusb3801_irq(int irq, void *data)
 {
 	struct wusb3801 *wusb3801 = data;
 	unsigned int dummy;

 	/*
 	 * The interrupt register must be read in order to clear the IRQ,
 	 * but all of the useful information is in the status register.
 	 */
 	regmap_read(wusb3801->regmap, WUSB3801_REG_INT, &dummy);

 	wusb3801_hw_update(wusb3801);

 	return IRQ_HANDLED;
 }

 static const struct regmap_config config = {
 	.reg_bits	= 8,
 	.val_bits	= 8,
 	.max_register	= WUSB3801_REG_TEST12,
 };

 static int wusb3801_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct fwnode_handle *connector;
 	struct wusb3801 *wusb3801;
 	const char *cap_str;
 	int ret;

 	wusb3801 = devm_kzalloc(dev, sizeof(*wusb3801), GFP_KERNEL);
 	if (!wusb3801)
 		return -ENOMEM;

 	i2c_set_clientdata(client, wusb3801);

 	wusb3801->dev = dev;

 	wusb3801->regmap = devm_regmap_init_i2c(client, &config);
 	if (IS_ERR(wusb3801->regmap))
 		return PTR_ERR(wusb3801->regmap);

 	wusb3801->vbus_supply = devm_regulator_get(dev, "vbus");
 	if (IS_ERR(wusb3801->vbus_supply))
 		return PTR_ERR(wusb3801->vbus_supply);

 	connector = device_get_named_child_node(dev, "connector");
 	if (!connector)
 		return -ENODEV;

 	ret = typec_get_fw_cap(&wusb3801->cap, connector);
 	if (ret)
 		goto err_put_connector;
 	wusb3801->port_type = wusb3801->cap.type;

 	ret = fwnode_property_read_string(connector, "typec-power-opmode", &cap_str);
 	if (ret)
 		goto err_put_connector;

 	ret = typec_find_pwr_opmode(cap_str);
 	if (ret < 0 || ret == TYPEC_PWR_MODE_PD)
 		goto err_put_connector;
 	wusb3801->pwr_opmode = ret;

 	/* Initialize the hardware with the devicetree settings. */
 	ret = wusb3801_hw_init(wusb3801);
 	if (ret)
 		return ret;

 	wusb3801->cap.revision		= USB_TYPEC_REV_1_2;
 	wusb3801->cap.accessory[0]	= TYPEC_ACCESSORY_AUDIO;
 	wusb3801->cap.accessory[1]	= TYPEC_ACCESSORY_DEBUG;
 	wusb3801->cap.orientation_aware	= true;
 	wusb3801->cap.driver_data	= wusb3801;
 	wusb3801->cap.ops		= &wusb3801_typec_ops;

 	wusb3801->port = typec_register_port(dev, &wusb3801->cap);
 	if (IS_ERR(wusb3801->port)) {
 		ret = PTR_ERR(wusb3801->port);
 		goto err_put_connector;
 	}

 	/* Initialize the port attributes from the hardware state. */
 	wusb3801_hw_update(wusb3801);

 	ret = request_threaded_irq(client->irq, NULL, wusb3801_irq,
 				   IRQF_ONESHOT, dev_name(dev), wusb3801);
 	if (ret)
 		goto err_unregister_port;

 	fwnode_handle_put(connector);

 	return 0;

 err_unregister_port:
 	typec_unregister_port(wusb3801->port);
 err_put_connector:
 	fwnode_handle_put(connector);

 	return ret;
 }

 static void wusb3801_remove(struct i2c_client *client)
 {
 	struct wusb3801 *wusb3801 = i2c_get_clientdata(client);

 	free_irq(client->irq, wusb3801);

 	if (wusb3801->partner)
 		typec_unregister_partner(wusb3801->partner);
 	typec_unregister_port(wusb3801->port);

 	if (wusb3801->vbus_on)
 		regulator_disable(wusb3801->vbus_supply);
 }

 static const struct of_device_id wusb3801_of_match[] = {
 	{ .compatible = "willsemi,wusb3801" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, wusb3801_of_match);

 static struct i2c_driver wusb3801_driver = {
 	.probe_new	= wusb3801_probe,
 	.remove		= wusb3801_remove,
 	.driver		= {
 		.name		= "wusb3801",
 		.of_match_table	= wusb3801_of_match,
 	},
 };

 module_i2c_driver(wusb3801_driver);

 MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>");
 MODULE_DESCRIPTION("Willsemi WUSB3801 Type-C port controller driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Willsemi WUSB3801 Type-C port controller driver
	*
	* Copyright (C) 2022 Samuel Holland <samuel@sholland.org>
	*/

	#include <linux/i2c.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/regulator/consumer.h>
	#include <linux/usb/typec.h>

	#define WUSB3801_REG_DEVICE_ID 0x01
	#define WUSB3801_REG_CTRL0 0x02
	#define WUSB3801_REG_INT 0x03
	#define WUSB3801_REG_STAT 0x04
	#define WUSB3801_REG_CTRL1 0x05
	#define WUSB3801_REG_TEST00 0x06
	#define WUSB3801_REG_TEST01 0x07
	#define WUSB3801_REG_TEST02 0x08
	#define WUSB3801_REG_TEST03 0x09
	#define WUSB3801_REG_TEST04 0x0a
	#define WUSB3801_REG_TEST05 0x0b
	#define WUSB3801_REG_TEST06 0x0c
	#define WUSB3801_REG_TEST07 0x0d
	#define WUSB3801_REG_TEST08 0x0e
	#define WUSB3801_REG_TEST09 0x0f
	#define WUSB3801_REG_TEST0A 0x10
	#define WUSB3801_REG_TEST0B 0x11
	#define WUSB3801_REG_TEST0C 0x12
	#define WUSB3801_REG_TEST0D 0x13
	#define WUSB3801_REG_TEST0E 0x14
	#define WUSB3801_REG_TEST0F 0x15
	#define WUSB3801_REG_TEST10 0x16
	#define WUSB3801_REG_TEST11 0x17
	#define WUSB3801_REG_TEST12 0x18

	#define WUSB3801_DEVICE_ID_VERSION_ID GENMASK(7, 3)
	#define WUSB3801_DEVICE_ID_VENDOR_ID GENMASK(2, 0)

	#define WUSB3801_CTRL0_DIS_ACC_SUPPORT BIT(7)
	#define WUSB3801_CTRL0_TRY GENMASK(6, 5)
	#define WUSB3801_CTRL0_TRY_NONE (0x0 << 5)
	#define WUSB3801_CTRL0_TRY_SNK (0x1 << 5)
	#define WUSB3801_CTRL0_TRY_SRC (0x2 << 5)
	#define WUSB3801_CTRL0_CURRENT GENMASK(4, 3) /* SRC */
	#define WUSB3801_CTRL0_CURRENT_DEFAULT (0x0 << 3)
	#define WUSB3801_CTRL0_CURRENT_1_5A (0x1 << 3)
	#define WUSB3801_CTRL0_CURRENT_3_0A (0x2 << 3)
	#define WUSB3801_CTRL0_ROLE GENMASK(2, 1)
	#define WUSB3801_CTRL0_ROLE_SNK (0x0 << 1)
	#define WUSB3801_CTRL0_ROLE_SRC (0x1 << 1)
	#define WUSB3801_CTRL0_ROLE_DRP (0x2 << 1)
	#define WUSB3801_CTRL0_INT_MASK BIT(0)

	#define WUSB3801_INT_ATTACHED BIT(0)
	#define WUSB3801_INT_DETACHED BIT(1)

	#define WUSB3801_STAT_VBUS_DETECTED BIT(7)
	#define WUSB3801_STAT_CURRENT GENMASK(6, 5) /* SNK */
	#define WUSB3801_STAT_CURRENT_STANDBY (0x0 << 5)
	#define WUSB3801_STAT_CURRENT_DEFAULT (0x1 << 5)
	#define WUSB3801_STAT_CURRENT_1_5A (0x2 << 5)
	#define WUSB3801_STAT_CURRENT_3_0A (0x3 << 5)
	#define WUSB3801_STAT_PARTNER GENMASK(4, 2)
	#define WUSB3801_STAT_PARTNER_STANDBY (0x0 << 2)
	#define WUSB3801_STAT_PARTNER_SNK (0x1 << 2)
	#define WUSB3801_STAT_PARTNER_SRC (0x2 << 2)
	#define WUSB3801_STAT_PARTNER_AUDIO (0x3 << 2)
	#define WUSB3801_STAT_PARTNER_DEBUG (0x4 << 2)
	#define WUSB3801_STAT_ORIENTATION GENMASK(1, 0)
	#define WUSB3801_STAT_ORIENTATION_NONE (0x0 << 0)
	#define WUSB3801_STAT_ORIENTATION_CC1 (0x1 << 0)
	#define WUSB3801_STAT_ORIENTATION_CC2 (0x2 << 0)
	#define WUSB3801_STAT_ORIENTATION_BOTH (0x3 << 0)

	#define WUSB3801_CTRL1_SM_RESET BIT(0)

	#define WUSB3801_TEST01_VENDOR_SUB_ID (BIT(8) \| BIT(6))

	#define WUSB3801_TEST02_FORCE_ERR_RCY BIT(8)

	#define WUSB3801_TEST0A_WAIT_VBUS BIT(5)

	struct wusb3801 {
	struct typec_capability cap;
	struct device *dev;
	struct typec_partner *partner;
	struct typec_port *port;
	struct regmap *regmap;
	struct regulator *vbus_supply;
	unsigned int partner_type;
	enum typec_port_type port_type;
	enum typec_pwr_opmode pwr_opmode;
	bool vbus_on;
	};

	static enum typec_role wusb3801_get_default_role(struct wusb3801 *wusb3801)
	{
	switch (wusb3801->port_type) {
	case TYPEC_PORT_SRC:
	return TYPEC_SOURCE;
	case TYPEC_PORT_SNK:
	return TYPEC_SINK;
	case TYPEC_PORT_DRP:
	default:
	if (wusb3801->cap.prefer_role == TYPEC_SOURCE)
	return TYPEC_SOURCE;
	return TYPEC_SINK;
	}
	}

	static int wusb3801_map_port_type(enum typec_port_type type)
	{
	switch (type) {
	case TYPEC_PORT_SRC:
	return WUSB3801_CTRL0_ROLE_SRC;
	case TYPEC_PORT_SNK:
	return WUSB3801_CTRL0_ROLE_SNK;
	case TYPEC_PORT_DRP:
	default:
	return WUSB3801_CTRL0_ROLE_DRP;
	}
	}

	static int wusb3801_map_pwr_opmode(enum typec_pwr_opmode mode)
	{
	switch (mode) {
	case TYPEC_PWR_MODE_USB:
	default:
	return WUSB3801_CTRL0_CURRENT_DEFAULT;
	case TYPEC_PWR_MODE_1_5A:
	return WUSB3801_CTRL0_CURRENT_1_5A;
	case TYPEC_PWR_MODE_3_0A:
	return WUSB3801_CTRL0_CURRENT_3_0A;
	}
	}

	static unsigned int wusb3801_map_try_role(int role)
	{
	switch (role) {
	case TYPEC_NO_PREFERRED_ROLE:
	default:
	return WUSB3801_CTRL0_TRY_NONE;
	case TYPEC_SINK:
	return WUSB3801_CTRL0_TRY_SNK;
	case TYPEC_SOURCE:
	return WUSB3801_CTRL0_TRY_SRC;
	}
	}

	static enum typec_orientation wusb3801_unmap_orientation(unsigned int status)
	{
	switch (status & WUSB3801_STAT_ORIENTATION) {
	case WUSB3801_STAT_ORIENTATION_NONE:
	case WUSB3801_STAT_ORIENTATION_BOTH:
	default:
	return TYPEC_ORIENTATION_NONE;
	case WUSB3801_STAT_ORIENTATION_CC1:
	return TYPEC_ORIENTATION_NORMAL;
	case WUSB3801_STAT_ORIENTATION_CC2:
	return TYPEC_ORIENTATION_REVERSE;
	}
	}

	static enum typec_pwr_opmode wusb3801_unmap_pwr_opmode(unsigned int status)
	{
	switch (status & WUSB3801_STAT_CURRENT) {
	case WUSB3801_STAT_CURRENT_STANDBY:
	case WUSB3801_STAT_CURRENT_DEFAULT:
	default:
	return TYPEC_PWR_MODE_USB;
	case WUSB3801_STAT_CURRENT_1_5A:
	return TYPEC_PWR_MODE_1_5A;
	case WUSB3801_STAT_CURRENT_3_0A:
	return TYPEC_PWR_MODE_3_0A;
	}
	}

	static int wusb3801_try_role(struct typec_port *port, int role)
	{
	struct wusb3801 *wusb3801 = typec_get_drvdata(port);

	return regmap_update_bits(wusb3801->regmap, WUSB3801_REG_CTRL0,
	WUSB3801_CTRL0_TRY,
	wusb3801_map_try_role(role));
	}

	static int wusb3801_port_type_set(struct typec_port *port,
	enum typec_port_type type)
	{
	struct wusb3801 *wusb3801 = typec_get_drvdata(port);
	int ret;

	ret = regmap_update_bits(wusb3801->regmap, WUSB3801_REG_CTRL0,
	WUSB3801_CTRL0_ROLE,
	wusb3801_map_port_type(type));
	if (ret)
	return ret;

	wusb3801->port_type = type;

	return 0;
	}

	static const struct typec_operations wusb3801_typec_ops = {
	.try_role = wusb3801_try_role,
	.port_type_set = wusb3801_port_type_set,
	};

	static int wusb3801_hw_init(struct wusb3801 *wusb3801)
	{
	return regmap_write(wusb3801->regmap, WUSB3801_REG_CTRL0,
	wusb3801_map_try_role(wusb3801->cap.prefer_role) \|
	wusb3801_map_pwr_opmode(wusb3801->pwr_opmode) \|
	wusb3801_map_port_type(wusb3801->port_type));
	}

	static void wusb3801_hw_update(struct wusb3801 *wusb3801)
	{
	struct typec_port *port = wusb3801->port;
	struct device *dev = wusb3801->dev;
	unsigned int partner_type, status;
	int ret;

	ret = regmap_read(wusb3801->regmap, WUSB3801_REG_STAT, &status);
	if (ret) {
	dev_warn(dev, "Failed to read port status: %d\n", ret);
	status = 0;
	}
	dev_dbg(dev, "status = 0x%02x\n", status);

	partner_type = status & WUSB3801_STAT_PARTNER;

	if (partner_type == WUSB3801_STAT_PARTNER_SNK) {
	if (!wusb3801->vbus_on) {
	ret = regulator_enable(wusb3801->vbus_supply);
	if (ret)
	dev_warn(dev, "Failed to enable VBUS: %d\n", ret);
	wusb3801->vbus_on = true;
	}
	} else {
	if (wusb3801->vbus_on) {
	regulator_disable(wusb3801->vbus_supply);
	wusb3801->vbus_on = false;
	}
	}

	if (partner_type != wusb3801->partner_type) {
	struct typec_partner_desc desc = {};
	enum typec_data_role data_role;
	enum typec_role pwr_role = wusb3801_get_default_role(wusb3801);

	switch (partner_type) {
	case WUSB3801_STAT_PARTNER_STANDBY:
	break;
	case WUSB3801_STAT_PARTNER_SNK:
	pwr_role = TYPEC_SOURCE;
	break;
	case WUSB3801_STAT_PARTNER_SRC:
	pwr_role = TYPEC_SINK;
	break;
	case WUSB3801_STAT_PARTNER_AUDIO:
	desc.accessory = TYPEC_ACCESSORY_AUDIO;
	break;
	case WUSB3801_STAT_PARTNER_DEBUG:
	desc.accessory = TYPEC_ACCESSORY_DEBUG;
	break;
	}

	if (wusb3801->partner) {
	typec_unregister_partner(wusb3801->partner);
	wusb3801->partner = NULL;
	}

	if (partner_type != WUSB3801_STAT_PARTNER_STANDBY) {
	wusb3801->partner = typec_register_partner(port, &desc);
	if (IS_ERR(wusb3801->partner))
	dev_err(dev, "Failed to register partner: %ld\n",
	PTR_ERR(wusb3801->partner));
	}

	data_role = pwr_role == TYPEC_SOURCE ? TYPEC_HOST : TYPEC_DEVICE;
	typec_set_data_role(port, data_role);
	typec_set_pwr_role(port, pwr_role);
	typec_set_vconn_role(port, pwr_role);
	}

	typec_set_pwr_opmode(wusb3801->port,
	partner_type == WUSB3801_STAT_PARTNER_SRC
	? wusb3801_unmap_pwr_opmode(status)
	: wusb3801->pwr_opmode);
	typec_set_orientation(wusb3801->port,
	wusb3801_unmap_orientation(status));

	wusb3801->partner_type = partner_type;
	}

	static irqreturn_t wusb3801_irq(int irq, void *data)
	{
	struct wusb3801 *wusb3801 = data;
	unsigned int dummy;

	/*
	* The interrupt register must be read in order to clear the IRQ,
	* but all of the useful information is in the status register.
	*/
	regmap_read(wusb3801->regmap, WUSB3801_REG_INT, &dummy);

	wusb3801_hw_update(wusb3801);

	return IRQ_HANDLED;
	}

	static const struct regmap_config config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = WUSB3801_REG_TEST12,
	};

	static int wusb3801_probe(struct i2c_client *client)
	{
	struct device *dev = &client->dev;
	struct fwnode_handle *connector;
	struct wusb3801 *wusb3801;
	const char *cap_str;
	int ret;

	wusb3801 = devm_kzalloc(dev, sizeof(*wusb3801), GFP_KERNEL);
	if (!wusb3801)
	return -ENOMEM;

	i2c_set_clientdata(client, wusb3801);

	wusb3801->dev = dev;

	wusb3801->regmap = devm_regmap_init_i2c(client, &config);
	if (IS_ERR(wusb3801->regmap))
	return PTR_ERR(wusb3801->regmap);

	wusb3801->vbus_supply = devm_regulator_get(dev, "vbus");
	if (IS_ERR(wusb3801->vbus_supply))
	return PTR_ERR(wusb3801->vbus_supply);

	connector = device_get_named_child_node(dev, "connector");
	if (!connector)
	return -ENODEV;

	ret = typec_get_fw_cap(&wusb3801->cap, connector);
	if (ret)
	goto err_put_connector;
	wusb3801->port_type = wusb3801->cap.type;

	ret = fwnode_property_read_string(connector, "typec-power-opmode", &cap_str);
	if (ret)
	goto err_put_connector;

	ret = typec_find_pwr_opmode(cap_str);
	if (ret < 0 \|\| ret == TYPEC_PWR_MODE_PD)
	goto err_put_connector;
	wusb3801->pwr_opmode = ret;

	/* Initialize the hardware with the devicetree settings. */
	ret = wusb3801_hw_init(wusb3801);
	if (ret)
	return ret;

	wusb3801->cap.revision = USB_TYPEC_REV_1_2;
	wusb3801->cap.accessory[0] = TYPEC_ACCESSORY_AUDIO;
	wusb3801->cap.accessory[1] = TYPEC_ACCESSORY_DEBUG;
	wusb3801->cap.orientation_aware = true;
	wusb3801->cap.driver_data = wusb3801;
	wusb3801->cap.ops = &wusb3801_typec_ops;

	wusb3801->port = typec_register_port(dev, &wusb3801->cap);
	if (IS_ERR(wusb3801->port)) {
	ret = PTR_ERR(wusb3801->port);
	goto err_put_connector;
	}

	/* Initialize the port attributes from the hardware state. */
	wusb3801_hw_update(wusb3801);

	ret = request_threaded_irq(client->irq, NULL, wusb3801_irq,
	IRQF_ONESHOT, dev_name(dev), wusb3801);
	if (ret)
	goto err_unregister_port;

	fwnode_handle_put(connector);

	return 0;

	err_unregister_port:
	typec_unregister_port(wusb3801->port);
	err_put_connector:
	fwnode_handle_put(connector);

	return ret;
	}

	static void wusb3801_remove(struct i2c_client *client)
	{
	struct wusb3801 *wusb3801 = i2c_get_clientdata(client);

	free_irq(client->irq, wusb3801);

	if (wusb3801->partner)
	typec_unregister_partner(wusb3801->partner);
	typec_unregister_port(wusb3801->port);

	if (wusb3801->vbus_on)
	regulator_disable(wusb3801->vbus_supply);
	}

	static const struct of_device_id wusb3801_of_match[] = {
	{ .compatible = "willsemi,wusb3801" },
	{}
	};
	MODULE_DEVICE_TABLE(of, wusb3801_of_match);

	static struct i2c_driver wusb3801_driver = {
	.probe_new = wusb3801_probe,
	.remove = wusb3801_remove,
	.driver = {
	.name = "wusb3801",
	.of_match_table = wusb3801_of_match,
	},
	};

	module_i2c_driver(wusb3801_driver);

	MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>");
	MODULE_DESCRIPTION("Willsemi WUSB3801 Type-C port controller driver");
	MODULE_LICENSE("GPL");