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Date: Thu, 8 Oct 2020 17:39:27 -0500
From: Michael Auchter <michael.auchter@...com>
To: MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>
Cc: Michael Auchter <michael.auchter@...com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] extcon: add driver for TI TUSB320
This patch adds an extcon driver for the TI TUSB320 USB Type-C device.
This can be used to detect whether the port is configured as a
downstream or upstream facing port.
Signed-off-by: Michael Auchter <michael.auchter@...com>
---
drivers/extcon/Kconfig | 7 ++
drivers/extcon/Makefile | 1 +
drivers/extcon/extcon-usbc-tusb320.c | 180 +++++++++++++++++++++++++++
3 files changed, 188 insertions(+)
create mode 100644 drivers/extcon/extcon-usbc-tusb320.c
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index aac507bff135..241acaf8b882 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -186,4 +186,11 @@ config EXTCON_USBC_CROS_EC
Say Y here to enable USB Type C cable detection extcon support when
using Chrome OS EC based USB Type-C ports.
+config EXTCON_USBC_TUSB320
+ tristate "TI TUSB320 USB-C extcon support"
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ Say Y here to enable support for USB Type C cable detection extcon
+ support using a TUSB320.
+
endif
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 52096fd8a216..fe10a1b7d18b 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o
obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o
obj-$(CONFIG_EXTCON_USBC_CROS_EC) += extcon-usbc-cros-ec.o
+obj-$(CONFIG_EXTCON_USBC_TUSB320) += extcon-usbc-tusb320.o
diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
new file mode 100644
index 000000000000..217d6f416ff6
--- /dev/null
+++ b/drivers/extcon/extcon-usbc-tusb320.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * drivers/extcon/extcon-tusb320.c - TUSB320 extcon driver
+ *
+ * Copyright (C) 2020 National Instruments Corporation
+ * Author: Michael Auchter <michael.auchter@...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 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.
+ */
+
+#include <linux/extcon-provider.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#define TUSB320_REG_9 0x9
+#define TUSB320_REG_9_INTERRUPT_STATUS BIT(4)
+#define TUSB320_REG_9_GET_ATTACHED_STATE(reg) (((reg) >> 6) & 0x3)
+#define TUSB320_REG_9_GET_CABLE_DIR(reg) (((reg) >> 5) & 1)
+#define TUSB320_ATTACHED_STATE_NONE 0x0
+#define TUSB320_ATTACHED_STATE_DFP 0x1
+#define TUSB320_ATTACHED_STATE_UFP 0x2
+#define TUSB320_ATTACHED_STATE_ACC 0x3
+
+static const char * const tusb_attached_states[] = {
+ [TUSB320_ATTACHED_STATE_NONE] = "not attached",
+ [TUSB320_ATTACHED_STATE_DFP] = "downstream facing port",
+ [TUSB320_ATTACHED_STATE_UFP] = "upstream facing port",
+ [TUSB320_ATTACHED_STATE_ACC] = "accessory",
+};
+
+static const unsigned int tusb320_extcon_cable[] = {
+ EXTCON_USB,
+ EXTCON_USB_HOST,
+ EXTCON_NONE,
+};
+
+static int tusb320_check_signature(struct i2c_client *client)
+{
+ static const char sig[] = { '\0', 'T', 'U', 'S', 'B', '3', '2', '0' };
+ int i, ret;
+
+ for (i = 0; i < sizeof(sig); i++) {
+ ret = i2c_smbus_read_byte_data(client, sizeof(sig) - 1 - i);
+ if (ret < 0)
+ return ret;
+ if (ret != sig[i]) {
+ dev_err(&client->dev, "signature mismatch!\n");
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
+{
+ struct i2c_client *client = dev_id;
+ struct extcon_dev *edev = i2c_get_clientdata(client);
+ int reg, state, polarity;
+
+ reg = i2c_smbus_read_byte_data(client, TUSB320_REG_9);
+ if (reg < 0) {
+ dev_err(&client->dev, "error during i2c read: %d\n", reg);
+ return IRQ_NONE;
+ }
+
+ if (!(reg & TUSB320_REG_9_INTERRUPT_STATUS))
+ return IRQ_NONE;
+
+ state = TUSB320_REG_9_GET_ATTACHED_STATE(reg);
+ polarity = TUSB320_REG_9_GET_CABLE_DIR(reg);
+
+ dev_dbg(&client->dev, "attached state: %s, polarity: %d\n",
+ tusb_attached_states[state], polarity);
+
+ extcon_set_state(edev, EXTCON_USB,
+ state == TUSB320_ATTACHED_STATE_UFP);
+ extcon_set_state(edev, EXTCON_USB_HOST,
+ state == TUSB320_ATTACHED_STATE_DFP);
+ extcon_set_property(edev, EXTCON_USB,
+ EXTCON_PROP_USB_TYPEC_POLARITY,
+ (union extcon_property_value)polarity);
+ extcon_set_property(edev, EXTCON_USB_HOST,
+ EXTCON_PROP_USB_TYPEC_POLARITY,
+ (union extcon_property_value)polarity);
+ extcon_sync(edev, EXTCON_USB);
+ extcon_sync(edev, EXTCON_USB_HOST);
+
+ i2c_smbus_write_byte_data(client, TUSB320_REG_9, reg);
+
+ return IRQ_HANDLED;
+}
+
+static int tusb320_extcon_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct extcon_dev *edev;
+ int ret;
+
+ ret = tusb320_check_signature(client);
+ if (ret)
+ return ret;
+
+ edev = devm_extcon_dev_allocate(&client->dev, tusb320_extcon_cable);
+ if (IS_ERR(edev)) {
+ dev_err(&client->dev, "failed to allocate extcon device\n");
+ return -ENOMEM;
+ }
+ i2c_set_clientdata(client, edev);
+
+ ret = devm_extcon_dev_register(&client->dev, edev);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to register extcon device\n");
+ return ret;
+ }
+
+ extcon_set_property_capability(edev, EXTCON_USB,
+ EXTCON_PROP_USB_TYPEC_POLARITY);
+ extcon_set_property_capability(edev, EXTCON_USB_HOST,
+ EXTCON_PROP_USB_TYPEC_POLARITY);
+
+ /* update initial state */
+ tusb320_irq_handler(client->irq, client);
+
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, tusb320_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(&client->dev), client);
+
+ return ret;
+}
+
+static const struct of_device_id tusb320_extcon_dt_match[] = {
+ { .compatible = "ti,tusb320", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tusb320_extcon_dt_match);
+
+static const struct i2c_device_id tusb320_i2c_id[] = {
+ { "tusb320", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tusb320_i2c_id);
+
+static struct i2c_driver tusb320_extcon_driver = {
+ .probe = tusb320_extcon_probe,
+ .driver = {
+ .name = "extcon-tusb320",
+ .of_match_table = tusb320_extcon_dt_match,
+ },
+};
+
+static int __init tusb320_init(void)
+{
+ return i2c_add_driver(&tusb320_extcon_driver);
+}
+subsys_initcall(tusb320_init);
+
+static void __exit tusb320_exit(void)
+{
+ i2c_del_driver(&tusb320_extcon_driver);
+}
+module_exit(tusb320_exit);
+
+MODULE_AUTHOR("Michael Auchter <michael.auchter@...com>");
+MODULE_DESCRIPTION("TI TUSB320 extcon driver");
+MODULE_LICENSE("GPL v2");
--
2.25.4
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