extcon: Add support for ptn5150 extcon driver (4ed754de) · Commits · 戴 / test

Documentation/devicetree/bindings/extcon/extcon-ptn5150.txt

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		* PTN5150 CC (Configuration Channel) Logic device

		PTN5150 is a small thin low power CC logic chip supporting the USB Type-C
		connector application with CC control logic detection and indication functions.
		It is interfaced to the host controller using an I2C interface.

		Required properties:
		- compatible: should be "nxp,ptn5150"
		- reg: specifies the I2C slave address of the device
		- int-gpio: should contain a phandle and GPIO specifier for the GPIO pin
		connected to the PTN5150's INTB pin.
		- vbus-gpio: should contain a phandle and GPIO specifier for the GPIO pin which
		is used to control VBUS.
		- pinctrl-names : a pinctrl state named "default" must be defined.
		- pinctrl-0 : phandle referencing pin configuration of interrupt and vbus
		control.

		Example:
		ptn5150@1d {
		compatible = "nxp,ptn5150";
		reg = <0x1d>;
		int-gpio = <&msmgpio 78 GPIO_ACTIVE_HIGH>;
		vbus-gpio = <&msmgpio 148 GPIO_ACTIVE_HIGH>;
		pinctrl-names = "default";
		pinctrl-0 = <&ptn5150_default>;
		status = "okay";
		};

drivers/extcon/Kconfig

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		@@ -114,6 +114,14 @@ config EXTCON_PALMAS
		Say Y here to enable support for USB peripheral and USB host
		detection by palmas usb.

		config EXTCON_PTN5150
		tristate "NXP PTN5150 CC LOGIC USB EXTCON support"
		depends on I2C && GPIOLIB \|\| COMPILE_TEST
		select REGMAP_I2C
		help
		Say Y here to enable support for USB peripheral and USB host
		detection by NXP PTN5150 CC (Configuration Channel) logic chip.

		config EXTCON_QCOM_SPMI_MISC
		tristate "Qualcomm USB extcon support"
		depends on ARCH_QCOM \|\| COMPILE_TEST

drivers/extcon/Makefile

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		@@ -17,6 +17,7 @@ obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o
		obj-$(CONFIG_EXTCON_MAX77843) += extcon-max77843.o
		obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o
		obj-$(CONFIG_EXTCON_PALMAS) += extcon-palmas.o
		obj-$(CONFIG_EXTCON_PTN5150) += extcon-ptn5150.o
		obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o
		obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
		obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o

drivers/extcon/extcon-ptn5150.c

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		// 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 (!info->int_gpiod) {
		dev_err(dev, "failed to get INT GPIO\n");
		return -EINVAL;
		}
		info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
		if (!info->vbus_gpiod) {
		dev_err(dev, "failed to get VBUS GPIO\n");
		return -EINVAL;
		}
		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");

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