extcon: Add support for ptn5150 extcon driver

PTN5150 is a small thin low power CC (Configurationn Channel)
Logic chip supporting the USB Type-C connector application with
CC control logic detection and indication functions.

Signed-off-by: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
[cw00.choi: Fix bulid dependency and clean-up code]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 339 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
new file mode 100644
index 000000000000..18a8f258767b
--- /dev/null
+++ b/drivers/extcon/extcon-ptn5150.c
@@ -0,0 +1,339 @@
+// 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");