// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for TI TPS6598x USB Power Delivery controller family
 *
 * Copyright (C) 2017, Intel Corporation
 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
 */

#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/interrupt.h>
#include <linux/usb/typec.h>
#include <linux/usb/typec_altmode.h>
#include <linux/usb/role.h>
#include <linux/workqueue.h>
#include <linux/firmware.h>

#include "tps6598x.h"
#include "trace.h"

/* Register offsets */
#define TPS_REG_VID			0x00
#define TPS_REG_MODE			0x03
#define TPS_REG_CMD1			0x08
#define TPS_REG_DATA1			0x09
#define TPS_REG_INT_EVENT1		0x14
#define TPS_REG_INT_EVENT2		0x15
#define TPS_REG_INT_MASK1		0x16
#define TPS_REG_INT_MASK2		0x17
#define TPS_REG_INT_CLEAR1		0x18
#define TPS_REG_INT_CLEAR2		0x19
#define TPS_REG_SYSTEM_POWER_STATE	0x20
#define TPS_REG_STATUS			0x1a
#define TPS_REG_SYSTEM_CONF		0x28
#define TPS_REG_CTRL_CONF		0x29
#define TPS_REG_BOOT_STATUS		0x2D
#define TPS_REG_POWER_STATUS		0x3f
#define TPS_REG_PD_STATUS		0x40
#define TPS_REG_RX_IDENTITY_SOP		0x48
#define TPS_REG_DATA_STATUS		0x5f
#define TPS_REG_SLEEP_CONF		0x70

/* TPS_REG_SYSTEM_CONF bits */
#define TPS_SYSCONF_PORTINFO(c)		((c) & 7)

/*
 * BPMs task timeout, recommended 5 seconds
 * pg.48 TPS2575 Host Interface Technical Reference
 * Manual (Rev. A)
 * https://www.ti.com/lit/ug/slvuc05a/slvuc05a.pdf
 */
#define TPS_BUNDLE_TIMEOUT	0x32

/* BPMs return code */
#define TPS_TASK_BPMS_INVALID_BUNDLE_SIZE	0x4
#define TPS_TASK_BPMS_INVALID_SLAVE_ADDR	0x5
#define TPS_TASK_BPMS_INVALID_TIMEOUT		0x6

/* PBMc data out */
#define TPS_PBMC_RC	0 /* Return code */
#define TPS_PBMC_DPCS	2 /* device patch complete status */

/* reset de-assertion to ready for operation */
#define TPS_SETUP_MS			1000

enum {
	TPS_PORTINFO_SINK,
	TPS_PORTINFO_SINK_ACCESSORY,
	TPS_PORTINFO_DRP_UFP,
	TPS_PORTINFO_DRP_UFP_DRD,
	TPS_PORTINFO_DRP_DFP,
	TPS_PORTINFO_DRP_DFP_DRD,
	TPS_PORTINFO_SOURCE,
};

/* TPS_REG_RX_IDENTITY_SOP */
struct tps6598x_rx_identity_reg {
	u8 status;
	struct usb_pd_identity identity;
} __packed;

/* Standard Task return codes */
#define TPS_TASK_TIMEOUT		1
#define TPS_TASK_REJECTED		3

enum {
	TPS_MODE_APP,
	TPS_MODE_BOOT,
	TPS_MODE_BIST,
	TPS_MODE_DISC,
	TPS_MODE_PTCH,
};

static const char *const modes[] = {
	[TPS_MODE_APP]	= "APP ",
	[TPS_MODE_BOOT]	= "BOOT",
	[TPS_MODE_BIST]	= "BIST",
	[TPS_MODE_DISC]	= "DISC",
	[TPS_MODE_PTCH] = "PTCH",
};

/* Unrecognized commands will be replaced with "!CMD" */
#define INVALID_CMD(_cmd_)		(_cmd_ == 0x444d4321)

struct tps6598x;

struct tipd_data {
	irq_handler_t irq_handler;
	int (*register_port)(struct tps6598x *tps, struct fwnode_handle *node);
	void (*trace_power_status)(u16 status);
	void (*trace_status)(u32 status);
	int (*apply_patch)(struct tps6598x *tps);
	int (*init)(struct tps6598x *tps);
	int (*reset)(struct tps6598x *tps);
};

struct tps6598x {
	struct device *dev;
	struct regmap *regmap;
	struct mutex lock; /* device lock */
	u8 i2c_protocol:1;

	struct gpio_desc *reset;
	struct typec_port *port;
	struct typec_partner *partner;
	struct usb_pd_identity partner_identity;
	struct usb_role_switch *role_sw;
	struct typec_capability typec_cap;

	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	enum power_supply_usb_type usb_type;

	int wakeup;
	u32 status; /* status reg */
	u16 pwr_status;
	struct delayed_work	wq_poll;

	const struct tipd_data *data;
};

static enum power_supply_property tps6598x_psy_props[] = {
	POWER_SUPPLY_PROP_USB_TYPE,
	POWER_SUPPLY_PROP_ONLINE,
};

static enum power_supply_usb_type tps6598x_psy_usb_types[] = {
	POWER_SUPPLY_USB_TYPE_C,
	POWER_SUPPLY_USB_TYPE_PD,
};

static const char *tps6598x_psy_name_prefix = "tps6598x-source-psy-";

/*
 * Max data bytes for Data1, Data2, and other registers. See ch 1.3.2:
 * https://www.ti.com/lit/ug/slvuan1a/slvuan1a.pdf
 */
#define TPS_MAX_LEN	64

static int
tps6598x_block_read(struct tps6598x *tps, u8 reg, void *val, size_t len)
{
	u8 data[TPS_MAX_LEN + 1];
	int ret;

	if (len + 1 > sizeof(data))
		return -EINVAL;

	if (!tps->i2c_protocol)
		return regmap_raw_read(tps->regmap, reg, val, len);

	ret = regmap_raw_read(tps->regmap, reg, data, len + 1);
	if (ret)
		return ret;

	if (data[0] < len)
		return -EIO;

	memcpy(val, &data[1], len);
	return 0;
}

static int tps6598x_block_write(struct tps6598x *tps, u8 reg,
				const void *val, size_t len)
{
	u8 data[TPS_MAX_LEN + 1];

	if (len + 1 > sizeof(data))
		return -EINVAL;

	if (!tps->i2c_protocol)
		return regmap_raw_write(tps->regmap, reg, val, len);

	data[0] = len;
	memcpy(&data[1], val, len);

	return regmap_raw_write(tps->regmap, reg, data, len + 1);
}

static inline int tps6598x_read8(struct tps6598x *tps, u8 reg, u8 *val)
{
	return tps6598x_block_read(tps, reg, val, sizeof(u8));
}

static inline int tps6598x_read16(struct tps6598x *tps, u8 reg, u16 *val)
{
	return tps6598x_block_read(tps, reg, val, sizeof(u16));
}

static inline int tps6598x_read32(struct tps6598x *tps, u8 reg, u32 *val)
{
	return tps6598x_block_read(tps, reg, val, sizeof(u32));
}

static inline int tps6598x_read64(struct tps6598x *tps, u8 reg, u64 *val)
{
	return tps6598x_block_read(tps, reg, val, sizeof(u64));
}

static inline int tps6598x_write8(struct tps6598x *tps, u8 reg, u8 val)
{
	return tps6598x_block_write(tps, reg, &val, sizeof(u8));
}

static inline int tps6598x_write64(struct tps6598x *tps, u8 reg, u64 val)
{
	return tps6598x_block_write(tps, reg, &val, sizeof(u64));
}

static inline int
tps6598x_write_4cc(struct tps6598x *tps, u8 reg, const char *val)
{
	return tps6598x_block_write(tps, reg, val, 4);
}

static int tps6598x_read_partner_identity(struct tps6598x *tps)
{
	struct tps6598x_rx_identity_reg id;
	int ret;

	ret = tps6598x_block_read(tps, TPS_REG_RX_IDENTITY_SOP,
				  &id, sizeof(id));
	if (ret)
		return ret;

	tps->partner_identity = id.identity;

	return 0;
}

static void tps6598x_set_data_role(struct tps6598x *tps,
				   enum typec_data_role role, bool connected)
{
	enum usb_role role_val;

	if (role == TYPEC_HOST)
		role_val = USB_ROLE_HOST;
	else
		role_val = USB_ROLE_DEVICE;

	if (!connected)
		role_val = USB_ROLE_NONE;

	usb_role_switch_set_role(tps->role_sw, role_val);
	typec_set_data_role(tps->port, role);
}

static int tps6598x_connect(struct tps6598x *tps, u32 status)
{
	struct typec_partner_desc desc;
	enum typec_pwr_opmode mode;
	int ret;

	if (tps->partner)
		return 0;

	mode = TPS_POWER_STATUS_PWROPMODE(tps->pwr_status);

	desc.usb_pd = mode == TYPEC_PWR_MODE_PD;
	desc.accessory = TYPEC_ACCESSORY_NONE; /* XXX: handle accessories */
	desc.identity = NULL;

	if (desc.usb_pd) {
		ret = tps6598x_read_partner_identity(tps);
		if (ret)
			return ret;
		desc.identity = &tps->partner_identity;
	}

	typec_set_pwr_opmode(tps->port, mode);
	typec_set_pwr_role(tps->port, TPS_STATUS_TO_TYPEC_PORTROLE(status));
	typec_set_vconn_role(tps->port, TPS_STATUS_TO_TYPEC_VCONN(status));
	if (TPS_STATUS_TO_UPSIDE_DOWN(status))
		typec_set_orientation(tps->port, TYPEC_ORIENTATION_REVERSE);
	else
		typec_set_orientation(tps->port, TYPEC_ORIENTATION_NORMAL);
	typec_set_mode(tps->port, TYPEC_STATE_USB);
	tps6598x_set_data_role(tps, TPS_STATUS_TO_TYPEC_DATAROLE(status), true);

	tps->partner = typec_register_partner(tps->port, &desc);
	if (IS_ERR(tps->partner))
		return PTR_ERR(tps->partner);

	if (desc.identity)
		typec_partner_set_identity(tps->partner);

	power_supply_changed(tps->psy);

	return 0;
}

static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
{
	if (!IS_ERR(tps->partner))
		typec_unregister_partner(tps->partner);
	tps->partner = NULL;
	typec_set_pwr_opmode(tps->port, TYPEC_PWR_MODE_USB);
	typec_set_pwr_role(tps->port, TPS_STATUS_TO_TYPEC_PORTROLE(status));
	typec_set_vconn_role(tps->port, TPS_STATUS_TO_TYPEC_VCONN(status));
	typec_set_orientation(tps->port, TYPEC_ORIENTATION_NONE);
	typec_set_mode(tps->port, TYPEC_STATE_SAFE);
	tps6598x_set_data_role(tps, TPS_STATUS_TO_TYPEC_DATAROLE(status), false);

	power_supply_changed(tps->psy);
}

static int tps6598x_exec_cmd_tmo(struct tps6598x *tps, const char *cmd,
			     size_t in_len, const u8 *in_data,
			     size_t out_len, u8 *out_data,
			     u32 cmd_timeout_ms, u32 res_delay_ms)
{
	unsigned long timeout;
	u32 val;
	int ret;

	ret = tps6598x_read32(tps, TPS_REG_CMD1, &val);
	if (ret)
		return ret;
	if (val && !INVALID_CMD(val))
		return -EBUSY;

	if (in_len) {
		ret = tps6598x_block_write(tps, TPS_REG_DATA1,
					   in_data, in_len);
		if (ret)
			return ret;
	}

	ret = tps6598x_write_4cc(tps, TPS_REG_CMD1, cmd);
	if (ret < 0)
		return ret;

	timeout = jiffies + msecs_to_jiffies(cmd_timeout_ms);

	do {
		ret = tps6598x_read32(tps, TPS_REG_CMD1, &val);
		if (ret)
			return ret;
		if (INVALID_CMD(val))
			return -EINVAL;

		if (time_is_before_jiffies(timeout))
			return -ETIMEDOUT;
	} while (val);

	/* some commands require delay for the result to be available */
	mdelay(res_delay_ms);

	if (out_len) {
		ret = tps6598x_block_read(tps, TPS_REG_DATA1,
					  out_data, out_len);
		if (ret)
			return ret;
		val = out_data[0];
	} else {
		ret = tps6598x_block_read(tps, TPS_REG_DATA1, &val, sizeof(u8));
		if (ret)
			return ret;
	}

	switch (val) {
	case TPS_TASK_TIMEOUT:
		return -ETIMEDOUT;
	case TPS_TASK_REJECTED:
		return -EPERM;
	default:
		break;
	}

	return 0;
}

static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
			     size_t in_len, const u8 *in_data,
			     size_t out_len, u8 *out_data)
{
	return tps6598x_exec_cmd_tmo(tps, cmd, in_len, in_data,
				     out_len, out_data, 1000, 0);
}

static int tps6598x_dr_set(struct typec_port *port, enum typec_data_role role)
{
	const char *cmd = (role == TYPEC_DEVICE) ? "SWUF" : "SWDF";
	struct tps6598x *tps = typec_get_drvdata(port);
	u32 status;
	int ret;

	mutex_lock(&tps->lock);

	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL);
	if (ret)
		goto out_unlock;

	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
	if (ret)
		goto out_unlock;

	if (role != TPS_STATUS_TO_TYPEC_DATAROLE(status)) {
		ret = -EPROTO;
		goto out_unlock;
	}

	tps6598x_set_data_role(tps, role, true);

out_unlock:
	mutex_unlock(&tps->lock);

	return ret;
}

static int tps6598x_pr_set(struct typec_port *port, enum typec_role role)
{
	const char *cmd = (role == TYPEC_SINK) ? "SWSk" : "SWSr";
	struct tps6598x *tps = typec_get_drvdata(port);
	u32 status;
	int ret;

	mutex_lock(&tps->lock);

	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL);
	if (ret)
		goto out_unlock;

	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
	if (ret)
		goto out_unlock;

	if (role != TPS_STATUS_TO_TYPEC_PORTROLE(status)) {
		ret = -EPROTO;
		goto out_unlock;
	}

	typec_set_pwr_role(tps->port, role);

out_unlock:
	mutex_unlock(&tps->lock);

	return ret;
}

static const struct typec_operations tps6598x_ops = {
	.dr_set = tps6598x_dr_set,
	.pr_set = tps6598x_pr_set,
};

static bool tps6598x_read_status(struct tps6598x *tps, u32 *status)
{
	int ret;

	ret = tps6598x_read32(tps, TPS_REG_STATUS, status);
	if (ret) {
		dev_err(tps->dev, "%s: failed to read status\n", __func__);
		return false;
	}

	if (tps->data->trace_status)
		tps->data->trace_status(*status);

	return true;
}

static bool tps6598x_read_data_status(struct tps6598x *tps)
{
	u32 data_status;
	int ret;

	ret = tps6598x_read32(tps, TPS_REG_DATA_STATUS, &data_status);
	if (ret < 0) {
		dev_err(tps->dev, "failed to read data status: %d\n", ret);
		return false;
	}
	trace_tps6598x_data_status(data_status);

	return true;
}

static bool tps6598x_read_power_status(struct tps6598x *tps)
{
	u16 pwr_status;
	int ret;

	ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
	if (ret < 0) {
		dev_err(tps->dev, "failed to read power status: %d\n", ret);
		return false;
	}
	tps->pwr_status = pwr_status;

	if (tps->data->trace_power_status)
		tps->data->trace_power_status(pwr_status);

	return true;
}

static void tps6598x_handle_plug_event(struct tps6598x *tps, u32 status)
{
	int ret;

	if (status & TPS_STATUS_PLUG_PRESENT) {
		ret = tps6598x_connect(tps, status);
		if (ret)
			dev_err(tps->dev, "failed to register partner\n");
	} else {
		tps6598x_disconnect(tps, status);
	}
}

static irqreturn_t cd321x_interrupt(int irq, void *data)
{
	struct tps6598x *tps = data;
	u64 event = 0;
	u32 status;
	int ret;

	mutex_lock(&tps->lock);

	ret = tps6598x_read64(tps, TPS_REG_INT_EVENT1, &event);
	if (ret) {
		dev_err(tps->dev, "%s: failed to read events\n", __func__);
		goto err_unlock;
	}
	trace_cd321x_irq(event);

	if (!event)
		goto err_unlock;

	if (!tps6598x_read_status(tps, &status))
		goto err_clear_ints;

	if (event & APPLE_CD_REG_INT_POWER_STATUS_UPDATE)
		if (!tps6598x_read_power_status(tps))
			goto err_clear_ints;

	if (event & APPLE_CD_REG_INT_DATA_STATUS_UPDATE)
		if (!tps6598x_read_data_status(tps))
			goto err_clear_ints;

	/* Handle plug insert or removal */
	if (event & APPLE_CD_REG_INT_PLUG_EVENT)
		tps6598x_handle_plug_event(tps, status);

err_clear_ints:
	tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event);

err_unlock:
	mutex_unlock(&tps->lock);

	if (event)
		return IRQ_HANDLED;
	return IRQ_NONE;
}

static bool tps6598x_has_role_changed(struct tps6598x *tps, u32 status)
{
	status ^= tps->status;

	return status & (TPS_STATUS_PORTROLE | TPS_STATUS_DATAROLE);
}

static irqreturn_t tps25750_interrupt(int irq, void *data)
{
	struct tps6598x *tps = data;
	u64 event[2] = { };
	u32 status;
	int ret;

	mutex_lock(&tps->lock);

	ret = tps6598x_block_read(tps, TPS_REG_INT_EVENT1, event, 11);
	if (ret) {
		dev_err(tps->dev, "%s: failed to read events\n", __func__);
		goto err_unlock;
	}
	trace_tps25750_irq(event[0]);

	if (!(event[0] | event[1]))
		goto err_unlock;

	if (!tps6598x_read_status(tps, &status))
		goto err_clear_ints;

	if ((event[0] | event[1]) & TPS_REG_INT_POWER_STATUS_UPDATE)
		if (!tps6598x_read_power_status(tps))
			goto err_clear_ints;

	if ((event[0] | event[1]) & TPS_REG_INT_DATA_STATUS_UPDATE)
		if (!tps6598x_read_data_status(tps))
			goto err_clear_ints;

	/*
	 * data/port roles could be updated independently after
	 * a plug event. Therefore, we need to check
	 * for pr/dr status change to set TypeC dr/pr accordingly.
	 */
	if ((event[0] | event[1]) & TPS_REG_INT_PLUG_EVENT ||
	    tps6598x_has_role_changed(tps, status))
		tps6598x_handle_plug_event(tps, status);

	tps->status = status;

err_clear_ints:
	tps6598x_block_write(tps, TPS_REG_INT_CLEAR1, event, 11);

err_unlock:
	mutex_unlock(&tps->lock);

	if (event[0] | event[1])
		return IRQ_HANDLED;
	return IRQ_NONE;
}

static irqreturn_t tps6598x_interrupt(int irq, void *data)
{
	struct tps6598x *tps = data;
	u64 event1 = 0;
	u64 event2 = 0;
	u32 status;
	int ret;

	mutex_lock(&tps->lock);

	ret = tps6598x_read64(tps, TPS_REG_INT_EVENT1, &event1);
	ret |= tps6598x_read64(tps, TPS_REG_INT_EVENT2, &event2);
	if (ret) {
		dev_err(tps->dev, "%s: failed to read events\n", __func__);
		goto err_unlock;
	}
	trace_tps6598x_irq(event1, event2);

	if (!(event1 | event2))
		goto err_unlock;

	if (!tps6598x_read_status(tps, &status))
		goto err_clear_ints;

	if ((event1 | event2) & TPS_REG_INT_POWER_STATUS_UPDATE)
		if (!tps6598x_read_power_status(tps))
			goto err_clear_ints;

	if ((event1 | event2) & TPS_REG_INT_DATA_STATUS_UPDATE)
		if (!tps6598x_read_data_status(tps))
			goto err_clear_ints;

	/* Handle plug insert or removal */
	if ((event1 | event2) & TPS_REG_INT_PLUG_EVENT)
		tps6598x_handle_plug_event(tps, status);

err_clear_ints:
	tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event1);
	tps6598x_write64(tps, TPS_REG_INT_CLEAR2, event2);

err_unlock:
	mutex_unlock(&tps->lock);

	if (event1 | event2)
		return IRQ_HANDLED;
	return IRQ_NONE;
}

/* Time interval for Polling */
#define POLL_INTERVAL	500 /* msecs */
static void tps6598x_poll_work(struct work_struct *work)
{
	struct tps6598x *tps = container_of(to_delayed_work(work),
					    struct tps6598x, wq_poll);

	tps->data->irq_handler(0, tps);
	queue_delayed_work(system_power_efficient_wq,
			   &tps->wq_poll, msecs_to_jiffies(POLL_INTERVAL));
}

static int tps6598x_check_mode(struct tps6598x *tps)
{
	char mode[5] = { };
	int ret;

	ret = tps6598x_read32(tps, TPS_REG_MODE, (void *)mode);
	if (ret)
		return ret;

	ret = match_string(modes, ARRAY_SIZE(modes), mode);

	switch (ret) {
	case TPS_MODE_APP:
	case TPS_MODE_PTCH:
		return ret;
	case TPS_MODE_BOOT:
		dev_warn(tps->dev, "dead-battery condition\n");
		return ret;
	case TPS_MODE_BIST:
	case TPS_MODE_DISC:
	default:
		dev_err(tps->dev, "controller in unsupported mode \"%s\"\n",
			mode);
		break;
	}

	return -ENODEV;
}

static const struct regmap_config tps6598x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x7F,
};

static int tps6598x_psy_get_online(struct tps6598x *tps,
				   union power_supply_propval *val)
{
	if (TPS_POWER_STATUS_CONNECTION(tps->pwr_status) &&
	    TPS_POWER_STATUS_SOURCESINK(tps->pwr_status)) {
		val->intval = 1;
	} else {
		val->intval = 0;
	}
	return 0;
}

static int tps6598x_psy_get_prop(struct power_supply *psy,
				 enum power_supply_property psp,
				 union power_supply_propval *val)
{
	struct tps6598x *tps = power_supply_get_drvdata(psy);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_USB_TYPE:
		if (TPS_POWER_STATUS_PWROPMODE(tps->pwr_status) == TYPEC_PWR_MODE_PD)
			val->intval = POWER_SUPPLY_USB_TYPE_PD;
		else
			val->intval = POWER_SUPPLY_USB_TYPE_C;
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		ret = tps6598x_psy_get_online(tps, val);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int cd321x_switch_power_state(struct tps6598x *tps, u8 target_state)
{
	u8 state;
	int ret;

	ret = tps6598x_read8(tps, TPS_REG_SYSTEM_POWER_STATE, &state);
	if (ret)
		return ret;

	if (state == target_state)
		return 0;

	ret = tps6598x_exec_cmd(tps, "SSPS", sizeof(u8), &target_state, 0, NULL);
	if (ret)
		return ret;

	ret = tps6598x_read8(tps, TPS_REG_SYSTEM_POWER_STATE, &state);
	if (ret)
		return ret;

	if (state != target_state)
		return -EINVAL;

	return 0;
}

static int devm_tps6598_psy_register(struct tps6598x *tps)
{
	struct power_supply_config psy_cfg = {};
	const char *port_dev_name = dev_name(tps->dev);
	char *psy_name;

	psy_cfg.drv_data = tps;
	psy_cfg.fwnode = dev_fwnode(tps->dev);

	psy_name = devm_kasprintf(tps->dev, GFP_KERNEL, "%s%s", tps6598x_psy_name_prefix,
				  port_dev_name);
	if (!psy_name)
		return -ENOMEM;

	tps->psy_desc.name = psy_name;
	tps->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	tps->psy_desc.usb_types = tps6598x_psy_usb_types;
	tps->psy_desc.num_usb_types = ARRAY_SIZE(tps6598x_psy_usb_types);
	tps->psy_desc.properties = tps6598x_psy_props;
	tps->psy_desc.num_properties = ARRAY_SIZE(tps6598x_psy_props);
	tps->psy_desc.get_property = tps6598x_psy_get_prop;

	tps->usb_type = POWER_SUPPLY_USB_TYPE_C;

	tps->psy = devm_power_supply_register(tps->dev, &tps->psy_desc,
					       &psy_cfg);
	return PTR_ERR_OR_ZERO(tps->psy);
}

static int
tps6598x_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
{
	int ret;
	u32 conf;
	struct typec_capability typec_cap = { };

	ret = tps6598x_read32(tps, TPS_REG_SYSTEM_CONF, &conf);
	if (ret)
		return ret;

	typec_cap.revision = USB_TYPEC_REV_1_2;
	typec_cap.pd_revision = 0x200;
	typec_cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;
	typec_cap.driver_data = tps;
	typec_cap.ops = &tps6598x_ops;
	typec_cap.fwnode = fwnode;

	switch (TPS_SYSCONF_PORTINFO(conf)) {
	case TPS_PORTINFO_SINK_ACCESSORY:
	case TPS_PORTINFO_SINK:
		typec_cap.type = TYPEC_PORT_SNK;
		typec_cap.data = TYPEC_PORT_UFP;
		break;
	case TPS_PORTINFO_DRP_UFP_DRD:
	case TPS_PORTINFO_DRP_DFP_DRD:
		typec_cap.type = TYPEC_PORT_DRP;
		typec_cap.data = TYPEC_PORT_DRD;
		break;
	case TPS_PORTINFO_DRP_UFP:
		typec_cap.type = TYPEC_PORT_DRP;
		typec_cap.data = TYPEC_PORT_UFP;
		break;
	case TPS_PORTINFO_DRP_DFP:
		typec_cap.type = TYPEC_PORT_DRP;
		typec_cap.data = TYPEC_PORT_DFP;
		break;
	case TPS_PORTINFO_SOURCE:
		typec_cap.type = TYPEC_PORT_SRC;
		typec_cap.data = TYPEC_PORT_DFP;
		break;
	default:
		return -ENODEV;
	}

	tps->port = typec_register_port(tps->dev, &typec_cap);
	if (IS_ERR(tps->port))
		return PTR_ERR(tps->port);

	return 0;
}

static int tps_request_firmware(struct tps6598x *tps, const struct firmware **fw)
{
	const char *firmware_name;
	int ret;

	ret = device_property_read_string(tps->dev, "firmware-name",
					  &firmware_name);
	if (ret)
		return ret;

	ret = request_firmware(fw, firmware_name, tps->dev);
	if (ret) {
		dev_err(tps->dev, "failed to retrieve \"%s\"\n", firmware_name);
		return ret;
	}

	if ((*fw)->size == 0) {
		release_firmware(*fw);
		ret = -EINVAL;
	}

	return ret;
}

static int
tps25750_write_firmware(struct tps6598x *tps,
			u8 bpms_addr, const u8 *data, size_t len)
{
	struct i2c_client *client = to_i2c_client(tps->dev);
	int ret;
	u8 slave_addr;
	int timeout;

	slave_addr = client->addr;
	timeout = client->adapter->timeout;

	/*
	 * binary configuration size is around ~16Kbytes
	 * which might take some time to finish writing it
	 */
	client->adapter->timeout = msecs_to_jiffies(5000);
	client->addr = bpms_addr;

	ret = regmap_raw_write(tps->regmap, data[0], &data[1], len - 1);

	client->addr = slave_addr;
	client->adapter->timeout = timeout;

	return ret;
}

static int
tps25750_exec_pbms(struct tps6598x *tps, u8 *in_data, size_t in_len)
{
	int ret;
	u8 rc;

	ret = tps6598x_exec_cmd_tmo(tps, "PBMs", in_len, in_data,
				    sizeof(rc), &rc, 4000, 0);
	if (ret)
		return ret;

	switch (rc) {
	case TPS_TASK_BPMS_INVALID_BUNDLE_SIZE:
		dev_err(tps->dev, "%s: invalid fw size\n", __func__);
		return -EINVAL;
	case TPS_TASK_BPMS_INVALID_SLAVE_ADDR:
		dev_err(tps->dev, "%s: invalid slave address\n", __func__);
		return -EINVAL;
	case TPS_TASK_BPMS_INVALID_TIMEOUT:
		dev_err(tps->dev, "%s: timed out\n", __func__);
		return -ETIMEDOUT;
	default:
		break;
	}

	return 0;
}

static int tps25750_abort_patch_process(struct tps6598x *tps)
{
	int ret;

	ret = tps6598x_exec_cmd(tps, "PBMe", 0, NULL, 0, NULL);
	if (ret)
		return ret;

	ret = tps6598x_check_mode(tps);
	if (ret != TPS_MODE_PTCH)
		dev_err(tps->dev, "failed to switch to \"PTCH\" mode\n");

	return ret;
}

static int tps25750_start_patch_burst_mode(struct tps6598x *tps)
{
	int ret;
	const struct firmware *fw;
	const char *firmware_name;
	struct {
		u32 fw_size;
		u8 addr;
		u8 timeout;
	} __packed bpms_data;
	u32 addr;
	struct device_node *np = tps->dev->of_node;

	ret = device_property_read_string(tps->dev, "firmware-name",
					  &firmware_name);
	if (ret)
		return ret;

	ret = tps_request_firmware(tps, &fw);
	if (ret)
		return ret;

	ret = of_property_match_string(np, "reg-names", "patch-address");
	if (ret < 0) {
		dev_err(tps->dev, "failed to get patch-address %d\n", ret);
		goto release_fw;
	}

	ret = of_property_read_u32_index(np, "reg", ret, &addr);
	if (ret)
		goto release_fw;

	if (addr == 0 || (addr >= 0x20 && addr <= 0x23)) {
		dev_err(tps->dev, "wrong patch address %u\n", addr);
		ret = -EINVAL;
		goto release_fw;
	}

	bpms_data.addr = (u8)addr;
	bpms_data.fw_size = fw->size;
	bpms_data.timeout = TPS_BUNDLE_TIMEOUT;

	ret = tps25750_exec_pbms(tps, (u8 *)&bpms_data, sizeof(bpms_data));
	if (ret)
		goto release_fw;

	ret = tps25750_write_firmware(tps, bpms_data.addr, fw->data, fw->size);
	if (ret) {
		dev_err(tps->dev, "Failed to write patch %s of %zu bytes\n",
			firmware_name, fw->size);
		goto release_fw;
	}

	/*
	 * A delay of 500us is required after the firmware is written
	 * based on pg.62 in tps6598x Host Interface Technical
	 * Reference Manual
	 * https://www.ti.com/lit/ug/slvuc05a/slvuc05a.pdf
	 */
	udelay(500);

release_fw:
	release_firmware(fw);

	return ret;
}

static int tps25750_complete_patch_process(struct tps6598x *tps)
{
	int ret;
	u8 out_data[40];
	u8 dummy[2] = { };

	/*
	 * Without writing something to DATA_IN, this command would
	 * return an error
	 */
	ret = tps6598x_exec_cmd_tmo(tps, "PBMc", sizeof(dummy), dummy,
				    sizeof(out_data), out_data, 2000, 20);
	if (ret)
		return ret;

	if (out_data[TPS_PBMC_RC]) {
		dev_err(tps->dev,
			"%s: pbmc failed: %u\n", __func__,
			out_data[TPS_PBMC_RC]);
		return -EIO;
	}

	if (out_data[TPS_PBMC_DPCS]) {
		dev_err(tps->dev,
			"%s: failed device patch complete status: %u\n",
			__func__, out_data[TPS_PBMC_DPCS]);
		return -EIO;
	}

	return 0;
}

static int tps25750_apply_patch(struct tps6598x *tps)
{
	int ret;
	unsigned long timeout;
	u64 status = 0;

	ret = tps6598x_block_read(tps, TPS_REG_BOOT_STATUS, &status, 5);
	if (ret)
		return ret;
	/*
	 * Nothing to be done if the configuration
	 * is being loaded from EERPOM
	 */
	if (status & TPS_BOOT_STATUS_I2C_EEPROM_PRESENT)
		goto wait_for_app;

	ret = tps25750_start_patch_burst_mode(tps);
	if (ret) {
		tps25750_abort_patch_process(tps);
		return ret;
	}

	ret = tps25750_complete_patch_process(tps);
	if (ret)
		return ret;

wait_for_app:
	timeout = jiffies + msecs_to_jiffies(1000);

	do {
		ret = tps6598x_check_mode(tps);
		if (ret < 0)
			return ret;

		if (time_is_before_jiffies(timeout))
			return -ETIMEDOUT;

	} while (ret != TPS_MODE_APP);

	/*
	 * The dead battery flag may be triggered when the controller
	 * port is connected to a device that can source power and
	 * attempts to power up both the controller and the board it is on.
	 * To restore controller functionality, it is necessary to clear
	 * this flag
	 */
	if (status & TPS_BOOT_STATUS_DEAD_BATTERY_FLAG) {
		ret = tps6598x_exec_cmd(tps, "DBfg", 0, NULL, 0, NULL);
		if (ret) {
			dev_err(tps->dev, "failed to clear dead battery %d\n", ret);
			return ret;
		}
	}

	dev_info(tps->dev, "controller switched to \"APP\" mode\n");

	return 0;
};

static int tps6598x_apply_patch(struct tps6598x *tps)
{
	u8 in = TPS_PTCS_CONTENT_DEV | TPS_PTCS_CONTENT_APP;
	u8 out[TPS_MAX_LEN] = {0};
	size_t in_len = sizeof(in);
	size_t copied_bytes = 0;
	size_t bytes_left;
	const struct firmware *fw;
	const char *firmware_name;
	int ret;

	ret = device_property_read_string(tps->dev, "firmware-name",
					  &firmware_name);
	if (ret)
		return ret;

	ret = tps_request_firmware(tps, &fw);
	if (ret)
		return ret;

	ret = tps6598x_exec_cmd(tps, "PTCs", in_len, &in,
				TPS_PTCS_OUT_BYTES, out);
	if (ret || out[TPS_PTCS_STATUS] == TPS_PTCS_STATUS_FAIL) {
		if (!ret)
			ret = -EBUSY;
		dev_err(tps->dev, "Update start failed (%d)\n", ret);
		goto release_fw;
	}

	bytes_left = fw->size;
	while (bytes_left) {
		if (bytes_left < TPS_MAX_LEN)
			in_len = bytes_left;
		else
			in_len = TPS_MAX_LEN;
		ret = tps6598x_exec_cmd(tps, "PTCd", in_len,
					fw->data + copied_bytes,
					TPS_PTCD_OUT_BYTES, out);
		if (ret || out[TPS_PTCD_TRANSFER_STATUS] ||
		    out[TPS_PTCD_LOADING_STATE] == TPS_PTCD_LOAD_ERR) {
			if (!ret)
				ret = -EBUSY;
			dev_err(tps->dev, "Patch download failed (%d)\n", ret);
			goto release_fw;
		}
		copied_bytes += in_len;
		bytes_left -= in_len;
	}

	ret = tps6598x_exec_cmd(tps, "PTCc", 0, NULL, TPS_PTCC_OUT_BYTES, out);
	if (ret || out[TPS_PTCC_DEV] || out[TPS_PTCC_APP]) {
		if (!ret)
			ret = -EBUSY;
		dev_err(tps->dev, "Update completion failed (%d)\n", ret);
		goto release_fw;
	}
	msleep(TPS_SETUP_MS);
	dev_info(tps->dev, "Firmware update succeeded\n");

release_fw:
	release_firmware(fw);

	return ret;
};

static int cd321x_init(struct tps6598x *tps)
{
	return 0;
}

static int tps25750_init(struct tps6598x *tps)
{
	int ret;

	ret = tps->data->apply_patch(tps);
	if (ret)
		return ret;

	ret = tps6598x_write8(tps, TPS_REG_SLEEP_CONF,
			      TPS_SLEEP_CONF_SLEEP_MODE_ALLOWED);
	if (ret)
		dev_warn(tps->dev,
			 "%s: failed to enable sleep mode: %d\n",
			 __func__, ret);

	return 0;
}

static int tps6598x_init(struct tps6598x *tps)
{
	return tps->data->apply_patch(tps);
}

static int cd321x_reset(struct tps6598x *tps)
{
	return 0;
}

static int tps25750_reset(struct tps6598x *tps)
{
	return tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
}

static int tps6598x_reset(struct tps6598x *tps)
{
	return 0;
}

static int
tps25750_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
{
	struct typec_capability typec_cap = { };
	const char *data_role;
	u8 pd_status;
	int ret;

	ret = tps6598x_read8(tps, TPS_REG_PD_STATUS, &pd_status);
	if (ret)
		return ret;

	ret = fwnode_property_read_string(fwnode, "data-role", &data_role);
	if (ret) {
		dev_err(tps->dev, "data-role not found: %d\n", ret);
		return ret;
	}

	ret = typec_find_port_data_role(data_role);
	if (ret < 0) {
		dev_err(tps->dev, "unknown data-role: %s\n", data_role);
		return ret;
	}

	typec_cap.data = ret;
	typec_cap.revision = USB_TYPEC_REV_1_3;
	typec_cap.pd_revision = 0x300;
	typec_cap.driver_data = tps;
	typec_cap.ops = &tps6598x_ops;
	typec_cap.fwnode = fwnode;
	typec_cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;

	switch (TPS_PD_STATUS_PORT_TYPE(pd_status)) {
	case TPS_PD_STATUS_PORT_TYPE_SINK_SOURCE:
	case TPS_PD_STATUS_PORT_TYPE_SOURCE_SINK:
		typec_cap.type = TYPEC_PORT_DRP;
		break;
	case TPS_PD_STATUS_PORT_TYPE_SINK:
		typec_cap.type = TYPEC_PORT_SNK;
		break;
	case TPS_PD_STATUS_PORT_TYPE_SOURCE:
		typec_cap.type = TYPEC_PORT_SRC;
		break;
	default:
		return -ENODEV;
	}

	tps->port = typec_register_port(tps->dev, &typec_cap);
	if (IS_ERR(tps->port))
		return PTR_ERR(tps->port);

	return 0;
}

static int tps6598x_probe(struct i2c_client *client)
{
	struct device_node *np = client->dev.of_node;
	struct tps6598x *tps;
	struct fwnode_handle *fwnode;
	u32 status;
	u32 vid;
	int ret;
	u64 mask1;

	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	if (!tps)
		return -ENOMEM;

	mutex_init(&tps->lock);
	tps->dev = &client->dev;

	tps->reset = devm_gpiod_get_optional(tps->dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(tps->reset))
		return dev_err_probe(tps->dev, PTR_ERR(tps->reset),
				     "failed to get reset GPIO\n");
	if (tps->reset)
		msleep(TPS_SETUP_MS);

	tps->regmap = devm_regmap_init_i2c(client, &tps6598x_regmap_config);
	if (IS_ERR(tps->regmap))
		return PTR_ERR(tps->regmap);

	if (!device_is_compatible(tps->dev, "ti,tps25750")) {
		ret = tps6598x_read32(tps, TPS_REG_VID, &vid);
		if (ret < 0 || !vid)
			return -ENODEV;
	}

	/*
	 * Checking can the adapter handle SMBus protocol. If it can not, the
	 * driver needs to take care of block reads separately.
	 */
	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
		tps->i2c_protocol = true;

	if (np && of_device_is_compatible(np, "apple,cd321x")) {
		/* Switch CD321X chips to the correct system power state */
		ret = cd321x_switch_power_state(tps, TPS_SYSTEM_POWER_STATE_S0);
		if (ret)
			return ret;

		/* CD321X chips have all interrupts masked initially */
		mask1 = APPLE_CD_REG_INT_POWER_STATUS_UPDATE |
			APPLE_CD_REG_INT_DATA_STATUS_UPDATE |
			APPLE_CD_REG_INT_PLUG_EVENT;

	} else {
		/* Enable power status, data status and plug event interrupts */
		mask1 = TPS_REG_INT_POWER_STATUS_UPDATE |
			TPS_REG_INT_DATA_STATUS_UPDATE |
			TPS_REG_INT_PLUG_EVENT;
	}

	if (dev_fwnode(tps->dev))
		tps->data = device_get_match_data(tps->dev);
	else
		tps->data = i2c_get_match_data(client);
	if (!tps->data)
		return -EINVAL;

	/* Make sure the controller has application firmware running */
	ret = tps6598x_check_mode(tps);
	if (ret < 0)
		return ret;

	if (ret == TPS_MODE_PTCH) {
		ret = tps->data->init(tps);
		if (ret)
			return ret;
	}

	ret = tps6598x_write64(tps, TPS_REG_INT_MASK1, mask1);
	if (ret)
		goto err_reset_controller;

	if (!tps6598x_read_status(tps, &status)) {
		ret = -ENODEV;
		goto err_clear_mask;
	}

	/*
	 * This fwnode has a "compatible" property, but is never populated as a
	 * struct device. Instead we simply parse it to read the properties.
	 * This breaks fw_devlink=on. To maintain backward compatibility
	 * with existing DT files, we work around this by deleting any
	 * fwnode_links to/from this fwnode.
	 */
	fwnode = device_get_named_child_node(&client->dev, "connector");
	if (fwnode)
		fw_devlink_purge_absent_suppliers(fwnode);

	tps->role_sw = fwnode_usb_role_switch_get(fwnode);
	if (IS_ERR(tps->role_sw)) {
		ret = PTR_ERR(tps->role_sw);
		goto err_fwnode_put;
	}

	ret = devm_tps6598_psy_register(tps);
	if (ret)
		goto err_role_put;

	ret = tps->data->register_port(tps, fwnode);
	if (ret)
		goto err_role_put;

	if (status & TPS_STATUS_PLUG_PRESENT) {
		ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &tps->pwr_status);
		if (ret < 0) {
			dev_err(tps->dev, "failed to read power status: %d\n", ret);
			goto err_unregister_port;
		}
		ret = tps6598x_connect(tps, status);
		if (ret)
			dev_err(&client->dev, "failed to register partner\n");
	}

	if (client->irq) {
		ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
						tps->data->irq_handler,
						IRQF_SHARED | IRQF_ONESHOT,
						dev_name(&client->dev), tps);
	} else {
		dev_warn(tps->dev, "Unable to find the interrupt, switching to polling\n");
		INIT_DELAYED_WORK(&tps->wq_poll, tps6598x_poll_work);
		queue_delayed_work(system_power_efficient_wq, &tps->wq_poll,
				   msecs_to_jiffies(POLL_INTERVAL));
	}

	if (ret)
		goto err_disconnect;

	i2c_set_clientdata(client, tps);
	fwnode_handle_put(fwnode);

	tps->wakeup = device_property_read_bool(tps->dev, "wakeup-source");
	if (tps->wakeup && client->irq) {
		device_init_wakeup(&client->dev, true);
		enable_irq_wake(client->irq);
	}

	return 0;

err_disconnect:
	tps6598x_disconnect(tps, 0);
err_unregister_port:
	typec_unregister_port(tps->port);
err_role_put:
	usb_role_switch_put(tps->role_sw);
err_fwnode_put:
	fwnode_handle_put(fwnode);
err_clear_mask:
	tps6598x_write64(tps, TPS_REG_INT_MASK1, 0);
err_reset_controller:
	/* Reset PD controller to remove any applied patch */
	tps->data->reset(tps);

	return ret;
}

static void tps6598x_remove(struct i2c_client *client)
{
	struct tps6598x *tps = i2c_get_clientdata(client);

	if (!client->irq)
		cancel_delayed_work_sync(&tps->wq_poll);

	devm_free_irq(tps->dev, client->irq, tps);
	tps6598x_disconnect(tps, 0);
	typec_unregister_port(tps->port);
	usb_role_switch_put(tps->role_sw);

	/* Reset PD controller to remove any applied patch */
	tps->data->reset(tps);

	if (tps->reset)
		gpiod_set_value_cansleep(tps->reset, 1);
}

static int __maybe_unused tps6598x_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct tps6598x *tps = i2c_get_clientdata(client);

	if (tps->wakeup) {
		disable_irq(client->irq);
		enable_irq_wake(client->irq);
	} else if (tps->reset) {
		gpiod_set_value_cansleep(tps->reset, 1);
	}

	if (!client->irq)
		cancel_delayed_work_sync(&tps->wq_poll);

	return 0;
}

static int __maybe_unused tps6598x_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct tps6598x *tps = i2c_get_clientdata(client);
	int ret;

	ret = tps6598x_check_mode(tps);
	if (ret < 0)
		return ret;

	if (ret == TPS_MODE_PTCH) {
		ret = tps->data->init(tps);
		if (ret)
			return ret;
	}

	if (tps->wakeup) {
		disable_irq_wake(client->irq);
		enable_irq(client->irq);
	} else if (tps->reset) {
		gpiod_set_value_cansleep(tps->reset, 0);
		msleep(TPS_SETUP_MS);
	}

	if (!client->irq)
		queue_delayed_work(system_power_efficient_wq, &tps->wq_poll,
				   msecs_to_jiffies(POLL_INTERVAL));

	return 0;
}

static const struct dev_pm_ops tps6598x_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(tps6598x_suspend, tps6598x_resume)
};

static const struct tipd_data cd321x_data = {
	.irq_handler = cd321x_interrupt,
	.register_port = tps6598x_register_port,
	.trace_power_status = trace_tps6598x_power_status,
	.trace_status = trace_tps6598x_status,
	.init = cd321x_init,
	.reset = cd321x_reset,
};

static const struct tipd_data tps6598x_data = {
	.irq_handler = tps6598x_interrupt,
	.register_port = tps6598x_register_port,
	.trace_power_status = trace_tps6598x_power_status,
	.trace_status = trace_tps6598x_status,
	.apply_patch = tps6598x_apply_patch,
	.init = tps6598x_init,
	.reset = tps6598x_reset,
};

static const struct tipd_data tps25750_data = {
	.irq_handler = tps25750_interrupt,
	.register_port = tps25750_register_port,
	.trace_power_status = trace_tps25750_power_status,
	.trace_status = trace_tps25750_status,
	.apply_patch = tps25750_apply_patch,
	.init = tps25750_init,
	.reset = tps25750_reset,
};

static const struct of_device_id tps6598x_of_match[] = {
	{ .compatible = "ti,tps6598x", &tps6598x_data},
	{ .compatible = "apple,cd321x", &cd321x_data},
	{ .compatible = "ti,tps25750", &tps25750_data},
	{}
};
MODULE_DEVICE_TABLE(of, tps6598x_of_match);

static const struct i2c_device_id tps6598x_id[] = {
	{ "tps6598x", (kernel_ulong_t)&tps6598x_data },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tps6598x_id);

static struct i2c_driver tps6598x_i2c_driver = {
	.driver = {
		.name = "tps6598x",
		.pm = &tps6598x_pm_ops,
		.of_match_table = tps6598x_of_match,
	},
	.probe = tps6598x_probe,
	.remove = tps6598x_remove,
	.id_table = tps6598x_id,
};
module_i2c_driver(tps6598x_i2c_driver);

MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI TPS6598x USB Power Delivery Controller Driver");