--- /dev/null
+// 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, ®_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, ®_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, ®_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, ®_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");
projects / platform / kernel / linux-starfive.git / commitdiff