We import here the Linux TUSB320 driver, so board code and user scripts
have access to following variables:
- $dev.usb_role = { device, host }
- $dev.pwr_role = { sink, source }
- $dev.accessory = { none, audio, debug }
These can be used to decide whether to switch a USB-C debug mux for
example.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
v1 -> v2:
- split off from first patch
- include <linux/bitops.h>
---
Documentation/user/usb.rst | 3 +
drivers/usb/typec/Kconfig | 8 ++
drivers/usb/typec/Makefile | 1 +
drivers/usb/typec/tusb320.c | 221 ++++++++++++++++++++++++++++++++++++
4 files changed, 233 insertions(+)
create mode 100644 drivers/usb/typec/tusb320.c
diff --git a/Documentation/user/usb.rst b/Documentation/user/usb.rst
index 20e223da93b5..2474ccb54b67 100644
--- a/Documentation/user/usb.rst
+++ b/Documentation/user/usb.rst
@@ -259,6 +259,9 @@ export a number of device parameters:
- ``$typec0.pwr_role`` = { ``sink``, ``source`` }
- ``$typec0.accessory`` = { ``none``, ``audio``, ``debug`` }
+Currently, only the TUSB320 is supported, but it's straight-forward to port more
+drivers from Linux.
+
USB Gadget autostart Support
----------------------------
diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index 56f10e6ca549..3b32a4e05a91 100644
--- a/drivers/usb/typec/Kconfig
+++ b/drivers/usb/typec/Kconfig
@@ -4,3 +4,11 @@
config TYPEC
prompt "Compile USB Type-C framework support" if COMPILE_TEST
bool
+
+config TYPEC_TUSB320
+ tristate "TI TUSB320 Type-C port controller"
+ depends on I2C
+ select REGMAP_I2C
+ select TYPEC
+ help
+ Say Y or here if your system has a TI TUSB320 Type-C port controller.
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index 6b8347f10c06..456b94afbf6f 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_TYPEC) += class.o
+obj-$(CONFIG_TYPEC_TUSB320) += tusb320.o
diff --git a/drivers/usb/typec/tusb320.c b/drivers/usb/typec/tusb320.c
new file mode 100644
index 000000000000..eb6b492481a3
--- /dev/null
+++ b/drivers/usb/typec/tusb320.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Based on the Linux driver:
+ * drivers/typec/typec-tusb320.c - TUSB320 typec driver
+ *
+ * Copyright (C) 2020 National Instruments Corporation
+ * Author: Michael Auchter <michael.auchter@xxxxxx>
+ */
+
+#include <linux/bitfield.h>
+#include <i2c/i2c.h>
+#include <init.h>
+#include <linux/kernel.h>
+#include <linux/printk.h>
+#include <linux/bitops.h>
+#include <module.h>
+#include <regmap.h>
+#include <linux/usb/typec.h>
+#include <linux/usb/typec_altmode.h>
+
+#define TUSB320_REG8 0x8
+#define TUSB320_REG8_CURRENT_MODE_ADVERTISE GENMASK(7, 6)
+#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_USB 0x0
+#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_15A 0x1
+#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_30A 0x2
+#define TUSB320_REG8_CURRENT_MODE_DETECT GENMASK(5, 4)
+#define TUSB320_REG8_CURRENT_MODE_DETECT_DEF 0x0
+#define TUSB320_REG8_CURRENT_MODE_DETECT_MED 0x1
+#define TUSB320_REG8_CURRENT_MODE_DETECT_ACC 0x2
+#define TUSB320_REG8_CURRENT_MODE_DETECT_HI 0x3
+#define TUSB320_REG8_ACCESSORY_CONNECTED GENMASK(3, 1)
+#define TUSB320_REG8_ACCESSORY_CONNECTED_NONE 0x0
+#define TUSB320_REG8_ACCESSORY_CONNECTED_AUDIO 0x4
+#define TUSB320_REG8_ACCESSORY_CONNECTED_ACHRG 0x5
+#define TUSB320_REG8_ACCESSORY_CONNECTED_DBGDFP 0x6
+#define TUSB320_REG8_ACCESSORY_CONNECTED_DBGUFP 0x7
+#define TUSB320_REG8_ACTIVE_CABLE_DETECTION BIT(0)
+
+#define TUSB320_REG9 0x9
+#define TUSB320_REG9_ATTACHED_STATE GENMASK(7, 6)
+#define TUSB320_REG9_CABLE_DIRECTION BIT(5)
+#define TUSB320_REG9_INTERRUPT_STATUS BIT(4)
+
+enum tusb320_attached_state {
+ TUSB320_ATTACHED_STATE_NONE,
+ TUSB320_ATTACHED_STATE_DFP,
+ TUSB320_ATTACHED_STATE_UFP,
+ TUSB320_ATTACHED_STATE_ACC,
+};
+
+struct tusb320_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ struct typec_port *port;
+ struct typec_capability cap;
+};
+
+static int tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
+{
+ struct typec_port *port = priv->port;
+ int typec_mode;
+ enum typec_role pwr_role;
+ enum usb_role usb_role;
+ u8 state, accessory;
+ int ret, reg8;
+
+ ret = regmap_read(priv->regmap, TUSB320_REG8, ®8);
+ if (ret)
+ return ret;
+
+ state = FIELD_GET(TUSB320_REG9_ATTACHED_STATE, reg9);
+ accessory = FIELD_GET(TUSB320_REG8_ACCESSORY_CONNECTED, reg8);
+
+ switch (state) {
+ case TUSB320_ATTACHED_STATE_DFP:
+ typec_mode = TYPEC_MODE_USB2;
+ usb_role = USB_ROLE_HOST;
+ pwr_role = TYPEC_SOURCE;
+ break;
+ case TUSB320_ATTACHED_STATE_UFP:
+ typec_mode = TYPEC_MODE_USB2;
+ usb_role = USB_ROLE_DEVICE;
+ pwr_role = TYPEC_SINK;
+ break;
+ case TUSB320_ATTACHED_STATE_ACC:
+ /*
+ * Accessory detected. For debug accessories, just make some
+ * qualified guesses as to the role for lack of a better option.
+ */
+ if (accessory == TUSB320_REG8_ACCESSORY_CONNECTED_AUDIO ||
+ accessory == TUSB320_REG8_ACCESSORY_CONNECTED_ACHRG) {
+ typec_mode = TYPEC_MODE_AUDIO;
+ usb_role = USB_ROLE_NONE;
+ pwr_role = TYPEC_SINK;
+ break;
+ } else if (accessory ==
+ TUSB320_REG8_ACCESSORY_CONNECTED_DBGDFP) {
+ typec_mode = TYPEC_MODE_DEBUG;
+ pwr_role = TYPEC_SOURCE;
+ usb_role = USB_ROLE_HOST;
+ break;
+ } else if (accessory ==
+ TUSB320_REG8_ACCESSORY_CONNECTED_DBGUFP) {
+ typec_mode = TYPEC_MODE_DEBUG;
+ pwr_role = TYPEC_SINK;
+ usb_role = USB_ROLE_DEVICE;
+ break;
+ }
+
+ dev_warn(priv->dev, "unexpected ACCESSORY_CONNECTED state %d\n",
+ accessory);
+
+ fallthrough;
+ default:
+ typec_mode = TYPEC_MODE_USB2;
+ usb_role = USB_ROLE_NONE;
+ pwr_role = TYPEC_SINK;
+ break;
+ }
+
+ typec_set_pwr_role(port, pwr_role);
+ typec_set_mode(port, typec_mode);
+ typec_set_role(port, usb_role);
+
+ return 0;
+}
+
+static int tusb320_state_update_handler(struct tusb320_priv *priv,
+ bool force_update)
+{
+ unsigned int reg;
+ int ret;
+
+ ret = regmap_read(priv->regmap, TUSB320_REG9, ®);
+ if (ret)
+ return ret;
+
+ if (!force_update && !(reg & TUSB320_REG9_INTERRUPT_STATUS))
+ return 0;
+
+ ret = tusb320_typec_irq_handler(priv, reg);
+
+ regmap_write(priv->regmap, TUSB320_REG9, reg);
+
+ return ret;
+}
+
+static irqreturn_t tusb320_irq_handler(struct typec_port *port)
+{
+ struct tusb320_priv *priv = typec_get_drvdata(port);
+
+ return tusb320_state_update_handler(priv, false);
+}
+
+static const struct typec_operations tusb320_typec_ops = {
+ .poll = tusb320_irq_handler,
+};
+
+static const struct regmap_config tusb320_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int tusb320_typec_probe(struct i2c_client *client,
+ struct tusb320_priv *priv)
+{
+ struct device_node *connector;
+
+ connector = of_get_child_by_name(client->dev.of_node, "connector");
+
+ priv->cap.driver_data = priv;
+ priv->cap.ops = &tusb320_typec_ops;
+ priv->cap.of_node = connector;
+
+ priv->port = typec_register_port(&client->dev, &priv->cap);
+
+ return PTR_ERR_OR_ZERO(priv->port);
+}
+
+static int tusb320_probe(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct tusb320_priv *priv;
+ int ret;
+
+ priv = xzalloc(sizeof(*priv));
+
+ priv->dev = &client->dev;
+ i2c_set_clientdata(client, priv);
+
+ priv->regmap = regmap_init_i2c(client, &tusb320_regmap_config);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ ret = tusb320_typec_probe(client, priv);
+ if (ret)
+ return ret;
+
+ /* update initial state */
+ tusb320_state_update_handler(priv, true);
+
+ return ret;
+}
+
+static const struct of_device_id tusb320_typec_dt_match[] = {
+ { .compatible = "ti,tusb320" },
+ { .compatible = "ti,tusb320l" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, tusb320_typec_dt_match);
+
+static struct driver tusb320_typec_driver = {
+ .name = "typec-tusb320",
+ .of_match_table = tusb320_typec_dt_match,
+ .probe = tusb320_probe,
+};
+device_i2c_driver(tusb320_typec_driver);
+
+MODULE_AUTHOR("Michael Auchter <michael.auchter@xxxxxx>");
+MODULE_DESCRIPTION("TI TUSB320 Type-C driver");
+MODULE_LICENSE("GPL v2");
--
2.39.2
