drivers/extcon/extcon-ptn5150.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection
 //
 // Based on extcon-sm5502.c driver
 // Copyright (c) 2018-2019 by Vijai Kumar K
 // Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>

 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/extcon-provider.h>
 #include <linux/gpio/consumer.h>

 /* PTN5150 registers */
 enum ptn5150_reg {
 	PTN5150_REG_DEVICE_ID = 0x01,
 	PTN5150_REG_CONTROL,
 	PTN5150_REG_INT_STATUS,
 	PTN5150_REG_CC_STATUS,
 	PTN5150_REG_CON_DET = 0x09,
 	PTN5150_REG_VCONN_STATUS,
 	PTN5150_REG_RESET,
 	PTN5150_REG_INT_MASK = 0x18,
 	PTN5150_REG_INT_REG_STATUS,
 	PTN5150_REG_END,
 };

 #define PTN5150_DFP_ATTACHED			0x1
 #define PTN5150_UFP_ATTACHED			0x2

 /* Define PTN5150 MASK/SHIFT constant */
 #define PTN5150_REG_DEVICE_ID_VENDOR_SHIFT	0
 #define PTN5150_REG_DEVICE_ID_VENDOR_MASK	\
 	(0x3 << PTN5150_REG_DEVICE_ID_VENDOR_SHIFT)

 #define PTN5150_REG_DEVICE_ID_VERSION_SHIFT	3
 #define PTN5150_REG_DEVICE_ID_VERSION_MASK	\
 	(0x1f << PTN5150_REG_DEVICE_ID_VERSION_SHIFT)

 #define PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT	2
 #define PTN5150_REG_CC_PORT_ATTACHMENT_MASK	\
 	(0x7 << PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT)

 #define PTN5150_REG_CC_VBUS_DETECTION_SHIFT	7
 #define PTN5150_REG_CC_VBUS_DETECTION_MASK	\
 	(0x1 << PTN5150_REG_CC_VBUS_DETECTION_SHIFT)

 #define PTN5150_REG_INT_CABLE_ATTACH_SHIFT	0
 #define PTN5150_REG_INT_CABLE_ATTACH_MASK	\
 	(0x1 << PTN5150_REG_INT_CABLE_ATTACH_SHIFT)

 #define PTN5150_REG_INT_CABLE_DETACH_SHIFT	1
 #define PTN5150_REG_INT_CABLE_DETACH_MASK	\
 	(0x1 << PTN5150_REG_CC_CABLE_DETACH_SHIFT)

 struct ptn5150_info {
 	struct device *dev;
 	struct extcon_dev *edev;
 	struct i2c_client *i2c;
 	struct regmap *regmap;
 	struct gpio_desc *int_gpiod;
 	struct gpio_desc *vbus_gpiod;
 	int irq;
 	struct work_struct irq_work;
 	struct mutex mutex;
 };

 /* List of detectable cables */
 static const unsigned int ptn5150_extcon_cable[] = {
 	EXTCON_USB,
 	EXTCON_USB_HOST,
 	EXTCON_NONE,
 };

 static const struct regmap_config ptn5150_regmap_config = {
 	.reg_bits	= 8,
 	.val_bits	= 8,
 	.max_register	= PTN5150_REG_END,
 };

 static void ptn5150_irq_work(struct work_struct *work)
 {
 	struct ptn5150_info *info = container_of(work,
 			struct ptn5150_info, irq_work);
 	int ret = 0;
 	unsigned int reg_data;
 	unsigned int int_status;

 	if (!info->edev)
 		return;

 	mutex_lock(&info->mutex);

 	ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &reg_data);
 	if (ret) {
 		dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
 		mutex_unlock(&info->mutex);
 		return;
 	}

 	/* Clear interrupt. Read would clear the register */
 	ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
 	if (ret) {
 		dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
 		mutex_unlock(&info->mutex);
 		return;
 	}

 	if (int_status) {
 		unsigned int cable_attach;

 		cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
 		if (cable_attach) {
 			unsigned int port_status;
 			unsigned int vbus;

 			port_status = ((reg_data &
 					PTN5150_REG_CC_PORT_ATTACHMENT_MASK) >>
 					PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT);

 			switch (port_status) {
 			case PTN5150_DFP_ATTACHED:
 				extcon_set_state_sync(info->edev,
 						EXTCON_USB_HOST, false);
 				gpiod_set_value(info->vbus_gpiod, 0);
 				extcon_set_state_sync(info->edev, EXTCON_USB,
 						true);
 				break;
 			case PTN5150_UFP_ATTACHED:
 				extcon_set_state_sync(info->edev, EXTCON_USB,
 						false);
 				vbus = ((reg_data &
 					PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
 					PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
 				if (vbus)
 					gpiod_set_value(info->vbus_gpiod, 0);
 				else
 					gpiod_set_value(info->vbus_gpiod, 1);

 				extcon_set_state_sync(info->edev,
 						EXTCON_USB_HOST, true);
 				break;
 			default:
 				dev_err(info->dev,
 					"Unknown Port status : %x\n",
 					port_status);
 				break;
 			}
 		} else {
 			extcon_set_state_sync(info->edev,
 					EXTCON_USB_HOST, false);
 			extcon_set_state_sync(info->edev,
 					EXTCON_USB, false);
 			gpiod_set_value(info->vbus_gpiod, 0);
 		}
 	}

 	/* Clear interrupt. Read would clear the register */
 	ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
 			&int_status);
 	if (ret) {
 		dev_err(info->dev,
 			"failed to read INT REG STATUS %d\n", ret);
 		mutex_unlock(&info->mutex);
 		return;
 	}

 	mutex_unlock(&info->mutex);
 }


 static irqreturn_t ptn5150_irq_handler(int irq, void *data)
 {
 	struct ptn5150_info *info = data;

 	schedule_work(&info->irq_work);

 	return IRQ_HANDLED;
 }

 static int ptn5150_init_dev_type(struct ptn5150_info *info)
 {
 	unsigned int reg_data, vendor_id, version_id;
 	int ret;

 	ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &reg_data);
 	if (ret) {
 		dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
 		return -EINVAL;
 	}

 	vendor_id = ((reg_data & PTN5150_REG_DEVICE_ID_VENDOR_MASK) >>
 				PTN5150_REG_DEVICE_ID_VENDOR_SHIFT);
 	version_id = ((reg_data & PTN5150_REG_DEVICE_ID_VERSION_MASK) >>
 				PTN5150_REG_DEVICE_ID_VERSION_SHIFT);

 	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 			    version_id, vendor_id);

 	/* Clear any existing interrupts */
 	ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &reg_data);
 	if (ret) {
 		dev_err(info->dev,
 			"failed to read PTN5150_REG_INT_STATUS %d\n",
 			ret);
 		return -EINVAL;
 	}

 	ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, &reg_data);
 	if (ret) {
 		dev_err(info->dev,
 			"failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int ptn5150_i2c_probe(struct i2c_client *i2c,
 				 const struct i2c_device_id *id)
 {
 	struct device *dev = &i2c->dev;
 	struct device_node *np = i2c->dev.of_node;
 	struct ptn5150_info *info;
 	int ret;

 	if (!np)
 		return -EINVAL;

 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 	i2c_set_clientdata(i2c, info);

 	info->dev = &i2c->dev;
 	info->i2c = i2c;
 	info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
 	if (IS_ERR(info->int_gpiod)) {
 		dev_err(dev, "failed to get INT GPIO\n");
 		return PTR_ERR(info->int_gpiod);
 	}
 	info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
 	if (IS_ERR(info->vbus_gpiod)) {
 		dev_err(dev, "failed to get VBUS GPIO\n");
 		return PTR_ERR(info->vbus_gpiod);
 	}
 	ret = gpiod_direction_output(info->vbus_gpiod, 0);
 	if (ret) {
 		dev_err(dev, "failed to set VBUS GPIO direction\n");
 		return -EINVAL;
 	}

 	mutex_init(&info->mutex);

 	INIT_WORK(&info->irq_work, ptn5150_irq_work);

 	info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
 	if (IS_ERR(info->regmap)) {
 		ret = PTR_ERR(info->regmap);
 		dev_err(info->dev, "failed to allocate register map: %d\n",
 				   ret);
 		return ret;
 	}

 	if (info->int_gpiod) {
 		info->irq = gpiod_to_irq(info->int_gpiod);
 		if (info->irq < 0) {
 			dev_err(dev, "failed to get INTB IRQ\n");
 			return info->irq;
 		}

 		ret = devm_request_threaded_irq(dev, info->irq, NULL,
 						ptn5150_irq_handler,
 						IRQF_TRIGGER_FALLING |
 						IRQF_ONESHOT,
 						i2c->name, info);
 		if (ret < 0) {
 			dev_err(dev, "failed to request handler for INTB IRQ\n");
 			return ret;
 		}
 	}

 	/* Allocate extcon device */
 	info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
 	if (IS_ERR(info->edev)) {
 		dev_err(info->dev, "failed to allocate memory for extcon\n");
 		return -ENOMEM;
 	}

 	/* Register extcon device */
 	ret = devm_extcon_dev_register(info->dev, info->edev);
 	if (ret) {
 		dev_err(info->dev, "failed to register extcon device\n");
 		return ret;
 	}

 	/* Initialize PTN5150 device and print vendor id and version id */
 	ret = ptn5150_init_dev_type(info);
 	if (ret)
 		return -EINVAL;

 	return 0;
 }

 static const struct of_device_id ptn5150_dt_match[] = {
 	{ .compatible = "nxp,ptn5150" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, ptn5150_dt_match);

 static const struct i2c_device_id ptn5150_i2c_id[] = {
 	{ "ptn5150", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);

 static struct i2c_driver ptn5150_i2c_driver = {
 	.driver		= {
 		.name	= "ptn5150",
 		.of_match_table = ptn5150_dt_match,
 	},
 	.probe	= ptn5150_i2c_probe,
 	.id_table = ptn5150_i2c_id,
 };

 static int __init ptn5150_i2c_init(void)
 {
 	return i2c_add_driver(&ptn5150_i2c_driver);
 }
 subsys_initcall(ptn5150_i2c_init);

 MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
 MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+
	//
	// extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection
	//
	// Based on extcon-sm5502.c driver
	// Copyright (c) 2018-2019 by Vijai Kumar K
	// Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>

	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <linux/extcon-provider.h>
	#include <linux/gpio/consumer.h>

	/* PTN5150 registers */
	enum ptn5150_reg {
	PTN5150_REG_DEVICE_ID = 0x01,
	PTN5150_REG_CONTROL,
	PTN5150_REG_INT_STATUS,
	PTN5150_REG_CC_STATUS,
	PTN5150_REG_CON_DET = 0x09,
	PTN5150_REG_VCONN_STATUS,
	PTN5150_REG_RESET,
	PTN5150_REG_INT_MASK = 0x18,
	PTN5150_REG_INT_REG_STATUS,
	PTN5150_REG_END,
	};

	#define PTN5150_DFP_ATTACHED 0x1
	#define PTN5150_UFP_ATTACHED 0x2

	/* Define PTN5150 MASK/SHIFT constant */
	#define PTN5150_REG_DEVICE_ID_VENDOR_SHIFT 0
	#define PTN5150_REG_DEVICE_ID_VENDOR_MASK \
	(0x3 << PTN5150_REG_DEVICE_ID_VENDOR_SHIFT)

	#define PTN5150_REG_DEVICE_ID_VERSION_SHIFT 3
	#define PTN5150_REG_DEVICE_ID_VERSION_MASK \
	(0x1f << PTN5150_REG_DEVICE_ID_VERSION_SHIFT)

	#define PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT 2
	#define PTN5150_REG_CC_PORT_ATTACHMENT_MASK \
	(0x7 << PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT)

	#define PTN5150_REG_CC_VBUS_DETECTION_SHIFT 7
	#define PTN5150_REG_CC_VBUS_DETECTION_MASK \
	(0x1 << PTN5150_REG_CC_VBUS_DETECTION_SHIFT)

	#define PTN5150_REG_INT_CABLE_ATTACH_SHIFT 0
	#define PTN5150_REG_INT_CABLE_ATTACH_MASK \
	(0x1 << PTN5150_REG_INT_CABLE_ATTACH_SHIFT)

	#define PTN5150_REG_INT_CABLE_DETACH_SHIFT 1
	#define PTN5150_REG_INT_CABLE_DETACH_MASK \
	(0x1 << PTN5150_REG_CC_CABLE_DETACH_SHIFT)

	struct ptn5150_info {
	struct device *dev;
	struct extcon_dev *edev;
	struct i2c_client *i2c;
	struct regmap *regmap;
	struct gpio_desc *int_gpiod;
	struct gpio_desc *vbus_gpiod;
	int irq;
	struct work_struct irq_work;
	struct mutex mutex;
	};

	/* List of detectable cables */
	static const unsigned int ptn5150_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
	};

	static const struct regmap_config ptn5150_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = PTN5150_REG_END,
	};

	static void ptn5150_irq_work(struct work_struct *work)
	{
	struct ptn5150_info *info = container_of(work,
	struct ptn5150_info, irq_work);
	int ret = 0;
	unsigned int reg_data;
	unsigned int int_status;

	if (!info->edev)
	return;

	mutex_lock(&info->mutex);

	ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &reg_data);
	if (ret) {
	dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
	mutex_unlock(&info->mutex);
	return;
	}

	/* Clear interrupt. Read would clear the register */
	ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
	if (ret) {
	dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
	mutex_unlock(&info->mutex);
	return;
	}

	if (int_status) {
	unsigned int cable_attach;

	cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
	if (cable_attach) {
	unsigned int port_status;
	unsigned int vbus;

	port_status = ((reg_data &
	PTN5150_REG_CC_PORT_ATTACHMENT_MASK) >>
	PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT);

	switch (port_status) {
	case PTN5150_DFP_ATTACHED:
	extcon_set_state_sync(info->edev,
	EXTCON_USB_HOST, false);
	gpiod_set_value(info->vbus_gpiod, 0);
	extcon_set_state_sync(info->edev, EXTCON_USB,
	true);
	break;
	case PTN5150_UFP_ATTACHED:
	extcon_set_state_sync(info->edev, EXTCON_USB,
	false);
	vbus = ((reg_data &
	PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
	PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
	if (vbus)
	gpiod_set_value(info->vbus_gpiod, 0);
	else
	gpiod_set_value(info->vbus_gpiod, 1);

	extcon_set_state_sync(info->edev,
	EXTCON_USB_HOST, true);
	break;
	default:
	dev_err(info->dev,
	"Unknown Port status : %x\n",
	port_status);
	break;
	}
	} else {
	extcon_set_state_sync(info->edev,
	EXTCON_USB_HOST, false);
	extcon_set_state_sync(info->edev,
	EXTCON_USB, false);
	gpiod_set_value(info->vbus_gpiod, 0);
	}
	}

	/* Clear interrupt. Read would clear the register */
	ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
	&int_status);
	if (ret) {
	dev_err(info->dev,
	"failed to read INT REG STATUS %d\n", ret);
	mutex_unlock(&info->mutex);
	return;
	}

	mutex_unlock(&info->mutex);
	}


	static irqreturn_t ptn5150_irq_handler(int irq, void *data)
	{
	struct ptn5150_info *info = data;

	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
	}

	static int ptn5150_init_dev_type(struct ptn5150_info *info)
	{
	unsigned int reg_data, vendor_id, version_id;
	int ret;

	ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &reg_data);
	if (ret) {
	dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
	return -EINVAL;
	}

	vendor_id = ((reg_data & PTN5150_REG_DEVICE_ID_VENDOR_MASK) >>
	PTN5150_REG_DEVICE_ID_VENDOR_SHIFT);
	version_id = ((reg_data & PTN5150_REG_DEVICE_ID_VERSION_MASK) >>
	PTN5150_REG_DEVICE_ID_VERSION_SHIFT);

	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
	version_id, vendor_id);

	/* Clear any existing interrupts */
	ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &reg_data);
	if (ret) {
	dev_err(info->dev,
	"failed to read PTN5150_REG_INT_STATUS %d\n",
	ret);
	return -EINVAL;
	}

	ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, &reg_data);
	if (ret) {
	dev_err(info->dev,
	"failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
	return -EINVAL;
	}

	return 0;
	}

	static int ptn5150_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct device *dev = &i2c->dev;
	struct device_node *np = i2c->dev.of_node;
	struct ptn5150_info *info;
	int ret;

	if (!np)
	return -EINVAL;

	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;
	i2c_set_clientdata(i2c, info);

	info->dev = &i2c->dev;
	info->i2c = i2c;
	info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
	if (IS_ERR(info->int_gpiod)) {
	dev_err(dev, "failed to get INT GPIO\n");
	return PTR_ERR(info->int_gpiod);
	}
	info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
	if (IS_ERR(info->vbus_gpiod)) {
	dev_err(dev, "failed to get VBUS GPIO\n");
	return PTR_ERR(info->vbus_gpiod);
	}
	ret = gpiod_direction_output(info->vbus_gpiod, 0);
	if (ret) {
	dev_err(dev, "failed to set VBUS GPIO direction\n");
	return -EINVAL;
	}

	mutex_init(&info->mutex);

	INIT_WORK(&info->irq_work, ptn5150_irq_work);

	info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
	if (IS_ERR(info->regmap)) {
	ret = PTR_ERR(info->regmap);
	dev_err(info->dev, "failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	if (info->int_gpiod) {
	info->irq = gpiod_to_irq(info->int_gpiod);
	if (info->irq < 0) {
	dev_err(dev, "failed to get INTB IRQ\n");
	return info->irq;
	}

	ret = devm_request_threaded_irq(dev, info->irq, NULL,
	ptn5150_irq_handler,
	IRQF_TRIGGER_FALLING \|
	IRQF_ONESHOT,
	i2c->name, info);
	if (ret < 0) {
	dev_err(dev, "failed to request handler for INTB IRQ\n");
	return ret;
	}
	}

	/* Allocate extcon device */
	info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
	if (IS_ERR(info->edev)) {
	dev_err(info->dev, "failed to allocate memory for extcon\n");
	return -ENOMEM;
	}

	/* Register extcon device */
	ret = devm_extcon_dev_register(info->dev, info->edev);
	if (ret) {
	dev_err(info->dev, "failed to register extcon device\n");
	return ret;
	}

	/* Initialize PTN5150 device and print vendor id and version id */
	ret = ptn5150_init_dev_type(info);
	if (ret)
	return -EINVAL;

	return 0;
	}

	static const struct of_device_id ptn5150_dt_match[] = {
	{ .compatible = "nxp,ptn5150" },
	{ },
	};
	MODULE_DEVICE_TABLE(of, ptn5150_dt_match);

	static const struct i2c_device_id ptn5150_i2c_id[] = {
	{ "ptn5150", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);

	static struct i2c_driver ptn5150_i2c_driver = {
	.driver = {
	.name = "ptn5150",
	.of_match_table = ptn5150_dt_match,
	},
	.probe = ptn5150_i2c_probe,
	.id_table = ptn5150_i2c_id,
	};

	static int __init ptn5150_i2c_init(void)
	{
	return i2c_add_driver(&ptn5150_i2c_driver);
	}
	subsys_initcall(ptn5150_i2c_init);

	MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
	MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
	MODULE_LICENSE("GPL v2");