--- /dev/null
+/*
+ * extcon-ptn5150.c - NXP CC logic for USB Type-C applications
+ *
+ * Copyright 2017 NXP
+ * Author: Peter Chen <peter.chen@nxp.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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/extcon.h>
+#include <linux/gpio/consumer.h>
+
+/* PTN5150_REG_INT_STATUS */
+#define CABLE_ATTACHED (1 << 0)
+#define CABLE_DETACHED (1 << 1)
+/* PTN5150_REG_CC_STATUS */
+#define IS_DFP_ATTATCHED(val) (((val) & 0x1c) == 0x4)
+#define IS_UFP_ATTATCHED(val) (((val) & 0x1c) == 0x8)
+#define IS_NOT_CONNECTED(val) (((val) & 0x1c) == 0x0)
+/* PTN5150_REG_CON_DET */
+#define DISABLE_CON_DET (1 << 0)
+
+struct ptn5150_info {
+ struct device *dev;
+ struct extcon_dev *edev;
+
+ struct work_struct wq_detect_cable;
+ struct regmap *regmap;
+};
+
+/* List of detectable cables */
+static const unsigned int ptn5150_extcon_cable[] = {
+ EXTCON_USB,
+ EXTCON_USB_HOST,
+ EXTCON_NONE,
+};
+
+enum ptn5150_reg {
+ PTN5150_REG_DEVICE_ID = 0x1,
+ PTN5150_REG_CONTROL,
+ PTN5150_REG_INT_STATUS,
+ PTN5150_REG_CC_STATUS,
+ PTN5150_REG_RSVD_5,
+ PTN5150_REG_RSVD_6,
+ PTN5150_REG_RSVD_7,
+ PTN5150_REG_RSVD_8,
+ PTN5150_REG_CON_DET,
+ PTN5150_REG_VCONN_STATUS,
+ PTN5150_REG_RESET = 0x10,
+ PTN5150_REG_RSVD_11,
+ PTN5150_REG_RSVD_12,
+ PTN5150_REG_RSVD_13,
+ PTN5150_REG_RSVD_14,
+ PTN5150_REG_RSVD_15,
+ PTN5150_REG_RSVD_16,
+ PTN5150_REG_RSVD_17,
+ PTN5150_REG_INT_MASK,
+ PTN5150_REG_INT_REG_STATUS,
+
+ PTN5150_REG_END,
+};
+static const struct regmap_config ptn5150_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = PTN5150_REG_END,
+};
+
+static void ptn5150_detect_cable(struct work_struct *work)
+{
+ struct ptn5150_info *info = container_of(work, struct ptn5150_info,
+ wq_detect_cable);
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &val);
+ if (ret)
+ dev_err(info->dev, "failed to get CC status:%d\n", ret);
+
+ if (IS_UFP_ATTATCHED(val)) {
+ extcon_set_state_sync(info->edev, EXTCON_USB, false);
+ extcon_set_state_sync(info->edev, EXTCON_USB_HOST,
+ true);
+ } else if (IS_DFP_ATTATCHED(val)) {
+ extcon_set_state_sync(info->edev, EXTCON_USB_HOST,
+ false);
+ extcon_set_state_sync(info->edev, EXTCON_USB, true);
+ } else if (IS_NOT_CONNECTED(val)) {
+ extcon_set_state_sync(info->edev, EXTCON_USB, false);
+ extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
+ } else {
+ dev_dbg(info->dev, "other CC status is :0x%x", val);
+ }
+}
+
+static int ptn5150_clear_interrupt(struct ptn5150_info *info)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &val);
+ if (ret)
+ dev_err(info->dev,
+ "failed to clear interrupt status:%d\n",
+ ret);
+
+ return (ret < 0) ? ret : (int)val;
+}
+
+static irqreturn_t ptn5150_connect_irq_handler(int irq, void *dev_id)
+{
+ struct ptn5150_info *info = dev_id;
+
+ if (ptn5150_clear_interrupt(info) > 0)
+ queue_work(system_power_efficient_wq, &info->wq_detect_cable);
+
+ return IRQ_HANDLED;
+}
+
+static int ptn5150_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct device_node *np = i2c->dev.of_node;
+ struct ptn5150_info *info;
+ int ret, connect_irq, gpio_val, count = 1000;
+ unsigned int dev_id;
+ struct gpio_desc *connect_gpiod;
+
+ 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->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;
+ }
+
+ /* 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;
+ }
+
+ connect_gpiod = devm_gpiod_get(info->dev, "connect", GPIOD_IN);
+ if (IS_ERR(connect_gpiod)) {
+ dev_err(info->dev, "failed to get connect GPIO\n");
+ return PTR_ERR(connect_gpiod);
+ }
+
+ connect_irq = gpiod_to_irq(connect_gpiod);
+ if (connect_irq < 0) {
+ dev_err(info->dev, "failed to get connect IRQ\n");
+ return connect_irq;
+ }
+
+ /* Clear the pending interrupts */
+ ret = ptn5150_clear_interrupt(info);
+ if (ret < 0)
+ return ret;
+
+ gpio_val = gpiod_get_value(connect_gpiod);
+ /* Delay until the GPIO goes to high if it is low before */
+ while (gpio_val == 0 && count >= 0) {
+ gpio_val = gpiod_get_value(connect_gpiod);
+ usleep_range(10, 20);
+ count--;
+ }
+
+ if (count < 0)
+ dev_err(info->dev, "timeout for waiting gpio becoming high\n");
+
+ ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &dev_id);
+ if (ret) {
+ dev_err(info->dev, "failed to read device id:%d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(info->dev, "NXP PTN5150: Version ID:0x%x, Vendor ID:0x%x\n",
+ (dev_id >> 3), (dev_id & 0x3));
+
+ ret = regmap_update_bits(info->regmap, PTN5150_REG_CON_DET,
+ DISABLE_CON_DET, ~DISABLE_CON_DET);
+ if (ret) {
+ dev_err(info->dev,
+ "failed to enable CON_DET output on pin 5:%d\n",
+ ret);
+ return ret;
+ }
+
+ INIT_WORK(&info->wq_detect_cable, ptn5150_detect_cable);
+
+ ret = devm_request_threaded_irq(info->dev, connect_irq, NULL,
+ ptn5150_connect_irq_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ dev_name(info->dev), info);
+ if (ret < 0) {
+ dev_err(info->dev, "failed to request connect IRQ\n");
+ return ret;
+ }
+
+ /* Do cable detect now */
+ ptn5150_detect_cable(&info->wq_detect_cable);
+
+ return ret;
+}
+
+static int ptn5150_i2c_remove(struct i2c_client *i2c)
+{
+ return 0;
+}
+
+static const struct i2c_device_id ptn5150_id[] = {
+ { "ptn5150", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, ptn5150_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id ptn5150_of_match[] = {
+ { .compatible = "nxp,ptn5150", },
+ { .compatible = "nxp,ptn5150a", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ptn5150_of_match);
+#endif
+
+static struct i2c_driver ptn5150_i2c_driver = {
+ .driver = {
+ .name = "ptn5150",
+ .of_match_table = of_match_ptr(ptn5150_of_match),
+ },
+ .probe = ptn5150_i2c_probe,
+ .remove = ptn5150_i2c_remove,
+ .id_table = ptn5150_id,
+};
+module_i2c_driver(ptn5150_i2c_driver);
+
+MODULE_DESCRIPTION("NXP PTN5150 CC logic driver for USB Type-C");
+MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
+MODULE_LICENSE("GPL v2");
projects / linux.git / commitdiff