From: Vijai Kumar K <vijaikumar.kanagara...@gmail.com>

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.kanagara...@gmail.com>
[cw00.choi: fix indentation of binding document and change patch subject]
Signed-off-by: Chanwoo Choi <cw00.c...@samsung.com>
---
 .../devicetree/bindings/extcon/extcon-ptn5150.txt  |  27 ++
 drivers/extcon/Kconfig                             |   8 +
 drivers/extcon/Makefile                            |   1 +
 drivers/extcon/extcon-ptn5150.c                    | 339 +++++++++++++++++++++
 4 files changed, 375 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/extcon/extcon-ptn5150.txt
 create mode 100644 drivers/extcon/extcon-ptn5150.c

diff --git a/Documentation/devicetree/bindings/extcon/extcon-ptn5150.txt 
b/Documentation/devicetree/bindings/extcon/extcon-ptn5150.txt
new file mode 100644
index 000000000000..936fbdf12815
--- /dev/null
+++ b/Documentation/devicetree/bindings/extcon/extcon-ptn5150.txt
@@ -0,0 +1,27 @@
+* 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";
+       };
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index de15bf55895b..b9cc027e89ab 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -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
+       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
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 0888fdeded72..261ce4cfe209 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -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
diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
new file mode 100644
index 000000000000..b6d0557030d3
--- /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.kanagara...@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.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.kanagara...@gmail.com>");
+MODULE_LICENSE("GPL v2");
--
2.7.4

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