[PATCH v3 4/4] usb: typec: Support the WUSB3801 port controller
From: Samuel Holland
Date: Mon Feb 14 2022 - 00:01:49 EST
WUSB3801 features a configurable port type, accessory detection, and
plug orientation detection. It provides a hardware "ID" pin output for
compatibility with USB 2.0 OTG PHYs. Add a typec class driver for it.
Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
---
Changes in v3:
- Remove version info printout
Changes in v2:
- License the driver as GPL 2 only; probably best anyway as I used a
lot of other drivers/usb/typec code as inspiration
- Don't try to be clever; use `default` instead of `unreachable`
- Free the IRQ before unregistering the partner/port
drivers/usb/typec/Kconfig | 10 +
drivers/usb/typec/Makefile | 1 +
drivers/usb/typec/wusb3801.c | 437 +++++++++++++++++++++++++++++++++++
3 files changed, 448 insertions(+)
create mode 100644 drivers/usb/typec/wusb3801.c
diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index ab480f38523a..74acde9fc09f 100644
--- a/drivers/usb/typec/Kconfig
+++ b/drivers/usb/typec/Kconfig
@@ -88,6 +88,16 @@ config TYPEC_QCOM_PMIC
It will also enable the VBUS output to connected devices when a
DFP connection is made.
+config TYPEC_WUSB3801
+ tristate "Willsemi WUSB3801 Type-C port controller driver"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Say Y or M here if your system has a WUSB3801 Type-C port controller.
+
+ If you choose to build this driver as a dynamically linked module, the
+ module will be called wusb3801.ko.
+
source "drivers/usb/typec/mux/Kconfig"
source "drivers/usb/typec/altmodes/Kconfig"
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index 57870a2bd787..3b722ec28d99 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -9,4 +9,5 @@ obj-$(CONFIG_TYPEC_TPS6598X) += tipd/
obj-$(CONFIG_TYPEC_HD3SS3220) += hd3ss3220.o
obj-$(CONFIG_TYPEC_QCOM_PMIC) += qcom-pmic-typec.o
obj-$(CONFIG_TYPEC_STUSB160X) += stusb160x.o
+obj-$(CONFIG_TYPEC_WUSB3801) += wusb3801.o
obj-$(CONFIG_TYPEC) += mux/
diff --git a/drivers/usb/typec/wusb3801.c b/drivers/usb/typec/wusb3801.c
new file mode 100644
index 000000000000..e63509f8b01e
--- /dev/null
+++ b/drivers/usb/typec/wusb3801.c
@@ -0,0 +1,437 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Willsemi WUSB3801 Type-C port controller driver
+ *
+ * Copyright (C) 2022 Samuel Holland <samuel@xxxxxxxxxxxx>
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb/typec.h>
+
+#define WUSB3801_REG_DEVICE_ID 0x01
+#define WUSB3801_REG_CTRL0 0x02
+#define WUSB3801_REG_INT 0x03
+#define WUSB3801_REG_STAT 0x04
+#define WUSB3801_REG_CTRL1 0x05
+#define WUSB3801_REG_TEST00 0x06
+#define WUSB3801_REG_TEST01 0x07
+#define WUSB3801_REG_TEST02 0x08
+#define WUSB3801_REG_TEST03 0x09
+#define WUSB3801_REG_TEST04 0x0a
+#define WUSB3801_REG_TEST05 0x0b
+#define WUSB3801_REG_TEST06 0x0c
+#define WUSB3801_REG_TEST07 0x0d
+#define WUSB3801_REG_TEST08 0x0e
+#define WUSB3801_REG_TEST09 0x0f
+#define WUSB3801_REG_TEST0A 0x10
+#define WUSB3801_REG_TEST0B 0x11
+#define WUSB3801_REG_TEST0C 0x12
+#define WUSB3801_REG_TEST0D 0x13
+#define WUSB3801_REG_TEST0E 0x14
+#define WUSB3801_REG_TEST0F 0x15
+#define WUSB3801_REG_TEST10 0x16
+#define WUSB3801_REG_TEST11 0x17
+#define WUSB3801_REG_TEST12 0x18
+
+#define WUSB3801_DEVICE_ID_VERSION_ID GENMASK(7, 3)
+#define WUSB3801_DEVICE_ID_VENDOR_ID GENMASK(2, 0)
+
+#define WUSB3801_CTRL0_DIS_ACC_SUPPORT BIT(7)
+#define WUSB3801_CTRL0_TRY GENMASK(6, 5)
+#define WUSB3801_CTRL0_TRY_NONE (0x0 << 5)
+#define WUSB3801_CTRL0_TRY_SNK (0x1 << 5)
+#define WUSB3801_CTRL0_TRY_SRC (0x2 << 5)
+#define WUSB3801_CTRL0_CURRENT GENMASK(4, 3) /* SRC */
+#define WUSB3801_CTRL0_CURRENT_DEFAULT (0x0 << 3)
+#define WUSB3801_CTRL0_CURRENT_1_5A (0x1 << 3)
+#define WUSB3801_CTRL0_CURRENT_3_0A (0x2 << 3)
+#define WUSB3801_CTRL0_ROLE GENMASK(2, 1)
+#define WUSB3801_CTRL0_ROLE_SNK (0x0 << 1)
+#define WUSB3801_CTRL0_ROLE_SRC (0x1 << 1)
+#define WUSB3801_CTRL0_ROLE_DRP (0x2 << 1)
+#define WUSB3801_CTRL0_INT_MASK BIT(0)
+
+#define WUSB3801_INT_ATTACHED BIT(0)
+#define WUSB3801_INT_DETACHED BIT(1)
+
+#define WUSB3801_STAT_VBUS_DETECTED BIT(7)
+#define WUSB3801_STAT_CURRENT GENMASK(6, 5) /* SNK */
+#define WUSB3801_STAT_CURRENT_STANDBY (0x0 << 5)
+#define WUSB3801_STAT_CURRENT_DEFAULT (0x1 << 5)
+#define WUSB3801_STAT_CURRENT_1_5A (0x2 << 5)
+#define WUSB3801_STAT_CURRENT_3_0A (0x3 << 5)
+#define WUSB3801_STAT_PARTNER GENMASK(4, 2)
+#define WUSB3801_STAT_PARTNER_STANDBY (0x0 << 2)
+#define WUSB3801_STAT_PARTNER_SNK (0x1 << 2)
+#define WUSB3801_STAT_PARTNER_SRC (0x2 << 2)
+#define WUSB3801_STAT_PARTNER_AUDIO (0x3 << 2)
+#define WUSB3801_STAT_PARTNER_DEBUG (0x4 << 2)
+#define WUSB3801_STAT_ORIENTATION GENMASK(1, 0)
+#define WUSB3801_STAT_ORIENTATION_NONE (0x0 << 0)
+#define WUSB3801_STAT_ORIENTATION_CC1 (0x1 << 0)
+#define WUSB3801_STAT_ORIENTATION_CC2 (0x2 << 0)
+#define WUSB3801_STAT_ORIENTATION_BOTH (0x3 << 0)
+
+#define WUSB3801_CTRL1_SM_RESET BIT(0)
+
+#define WUSB3801_TEST01_VENDOR_SUB_ID (BIT(8) | BIT(6))
+
+#define WUSB3801_TEST02_FORCE_ERR_RCY BIT(8)
+
+#define WUSB3801_TEST0A_WAIT_VBUS BIT(5)
+
+struct wusb3801 {
+ struct typec_capability cap;
+ struct device *dev;
+ struct typec_partner *partner;
+ struct typec_port *port;
+ struct regmap *regmap;
+ struct regulator *vbus_supply;
+ unsigned int partner_type;
+ enum typec_port_type port_type;
+ enum typec_pwr_opmode pwr_opmode;
+ bool vbus_on;
+};
+
+static enum typec_role wusb3801_get_default_role(struct wusb3801 *wusb3801)
+{
+ switch (wusb3801->port_type) {
+ case TYPEC_PORT_SRC:
+ return TYPEC_SOURCE;
+ case TYPEC_PORT_SNK:
+ return TYPEC_SINK;
+ case TYPEC_PORT_DRP:
+ default:
+ if (wusb3801->cap.prefer_role == TYPEC_SOURCE)
+ return TYPEC_SOURCE;
+ return TYPEC_SINK;
+ }
+}
+
+static int wusb3801_map_port_type(enum typec_port_type type)
+{
+ switch (type) {
+ case TYPEC_PORT_SRC:
+ return WUSB3801_CTRL0_ROLE_SRC;
+ case TYPEC_PORT_SNK:
+ return WUSB3801_CTRL0_ROLE_SNK;
+ case TYPEC_PORT_DRP:
+ default:
+ return WUSB3801_CTRL0_ROLE_DRP;
+ }
+}
+
+static int wusb3801_map_pwr_opmode(enum typec_pwr_opmode mode)
+{
+ switch (mode) {
+ case TYPEC_PWR_MODE_USB:
+ default:
+ return WUSB3801_CTRL0_CURRENT_DEFAULT;
+ case TYPEC_PWR_MODE_1_5A:
+ return WUSB3801_CTRL0_CURRENT_1_5A;
+ case TYPEC_PWR_MODE_3_0A:
+ return WUSB3801_CTRL0_CURRENT_3_0A;
+ }
+}
+
+static unsigned int wusb3801_map_try_role(int role)
+{
+ switch (role) {
+ case TYPEC_NO_PREFERRED_ROLE:
+ default:
+ return WUSB3801_CTRL0_TRY_NONE;
+ case TYPEC_SINK:
+ return WUSB3801_CTRL0_TRY_SNK;
+ case TYPEC_SOURCE:
+ return WUSB3801_CTRL0_TRY_SRC;
+ }
+}
+
+static enum typec_orientation wusb3801_unmap_orientation(unsigned int status)
+{
+ switch (status & WUSB3801_STAT_ORIENTATION) {
+ case WUSB3801_STAT_ORIENTATION_NONE:
+ case WUSB3801_STAT_ORIENTATION_BOTH:
+ default:
+ return TYPEC_ORIENTATION_NONE;
+ case WUSB3801_STAT_ORIENTATION_CC1:
+ return TYPEC_ORIENTATION_NORMAL;
+ case WUSB3801_STAT_ORIENTATION_CC2:
+ return TYPEC_ORIENTATION_REVERSE;
+ }
+}
+
+static enum typec_pwr_opmode wusb3801_unmap_pwr_opmode(unsigned int status)
+{
+ switch (status & WUSB3801_STAT_CURRENT) {
+ case WUSB3801_STAT_CURRENT_STANDBY:
+ case WUSB3801_STAT_CURRENT_DEFAULT:
+ default:
+ return TYPEC_PWR_MODE_USB;
+ case WUSB3801_STAT_CURRENT_1_5A:
+ return TYPEC_PWR_MODE_1_5A;
+ case WUSB3801_STAT_CURRENT_3_0A:
+ return TYPEC_PWR_MODE_3_0A;
+ }
+}
+
+static int wusb3801_try_role(struct typec_port *port, int role)
+{
+ struct wusb3801 *wusb3801 = typec_get_drvdata(port);
+
+ return regmap_update_bits(wusb3801->regmap, WUSB3801_REG_CTRL0,
+ WUSB3801_CTRL0_TRY,
+ wusb3801_map_try_role(role));
+}
+
+static int wusb3801_port_type_set(struct typec_port *port,
+ enum typec_port_type type)
+{
+ struct wusb3801 *wusb3801 = typec_get_drvdata(port);
+ int ret;
+
+ ret = regmap_update_bits(wusb3801->regmap, WUSB3801_REG_CTRL0,
+ WUSB3801_CTRL0_ROLE,
+ wusb3801_map_port_type(type));
+ if (ret)
+ return ret;
+
+ wusb3801->port_type = type;
+
+ return 0;
+}
+
+static const struct typec_operations wusb3801_typec_ops = {
+ .try_role = wusb3801_try_role,
+ .port_type_set = wusb3801_port_type_set,
+};
+
+static int wusb3801_hw_init(struct wusb3801 *wusb3801)
+{
+ return regmap_write(wusb3801->regmap, WUSB3801_REG_CTRL0,
+ wusb3801_map_try_role(wusb3801->cap.prefer_role) |
+ wusb3801_map_pwr_opmode(wusb3801->pwr_opmode) |
+ wusb3801_map_port_type(wusb3801->port_type));
+}
+
+static void wusb3801_hw_update(struct wusb3801 *wusb3801)
+{
+ struct typec_port *port = wusb3801->port;
+ struct device *dev = wusb3801->dev;
+ unsigned int partner_type, status;
+ int ret;
+
+ ret = regmap_read(wusb3801->regmap, WUSB3801_REG_STAT, &status);
+ if (ret) {
+ dev_warn(dev, "Failed to read port status: %d\n", ret);
+ status = 0;
+ }
+ dev_dbg(dev, "status = 0x%02x\n", status);
+
+ partner_type = status & WUSB3801_STAT_PARTNER;
+
+ if (partner_type == WUSB3801_STAT_PARTNER_SNK) {
+ if (!wusb3801->vbus_on) {
+ ret = regulator_enable(wusb3801->vbus_supply);
+ if (ret)
+ dev_warn(dev, "Failed to enable VBUS: %d\n", ret);
+ wusb3801->vbus_on = true;
+ }
+ } else {
+ if (wusb3801->vbus_on) {
+ regulator_disable(wusb3801->vbus_supply);
+ wusb3801->vbus_on = false;
+ }
+ }
+
+ if (partner_type != wusb3801->partner_type) {
+ struct typec_partner_desc desc = {};
+ enum typec_data_role data_role;
+ enum typec_role pwr_role = wusb3801_get_default_role(wusb3801);
+
+ switch (partner_type) {
+ case WUSB3801_STAT_PARTNER_STANDBY:
+ break;
+ case WUSB3801_STAT_PARTNER_SNK:
+ pwr_role = TYPEC_SOURCE;
+ break;
+ case WUSB3801_STAT_PARTNER_SRC:
+ pwr_role = TYPEC_SINK;
+ break;
+ case WUSB3801_STAT_PARTNER_AUDIO:
+ desc.accessory = TYPEC_ACCESSORY_AUDIO;
+ break;
+ case WUSB3801_STAT_PARTNER_DEBUG:
+ desc.accessory = TYPEC_ACCESSORY_DEBUG;
+ break;
+ }
+
+ if (wusb3801->partner) {
+ typec_unregister_partner(wusb3801->partner);
+ wusb3801->partner = NULL;
+ }
+
+ if (partner_type != WUSB3801_STAT_PARTNER_STANDBY) {
+ wusb3801->partner = typec_register_partner(port, &desc);
+ if (IS_ERR(wusb3801->partner))
+ dev_err(dev, "Failed to register partner: %ld\n",
+ PTR_ERR(wusb3801->partner));
+ }
+
+ data_role = pwr_role == TYPEC_SOURCE ? TYPEC_HOST : TYPEC_DEVICE;
+ typec_set_data_role(port, data_role);
+ typec_set_pwr_role(port, pwr_role);
+ typec_set_vconn_role(port, pwr_role);
+ }
+
+ typec_set_pwr_opmode(wusb3801->port,
+ partner_type == WUSB3801_STAT_PARTNER_SRC
+ ? wusb3801_unmap_pwr_opmode(status)
+ : wusb3801->pwr_opmode);
+ typec_set_orientation(wusb3801->port,
+ wusb3801_unmap_orientation(status));
+
+ wusb3801->partner_type = partner_type;
+}
+
+static irqreturn_t wusb3801_irq(int irq, void *data)
+{
+ struct wusb3801 *wusb3801 = data;
+ unsigned int dummy;
+
+ /*
+ * The interrupt register must be read in order to clear the IRQ,
+ * but all of the useful information is in the status register.
+ */
+ regmap_read(wusb3801->regmap, WUSB3801_REG_INT, &dummy);
+
+ wusb3801_hw_update(wusb3801);
+
+ return IRQ_HANDLED;
+}
+
+static const struct regmap_config config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = WUSB3801_REG_TEST12,
+};
+
+static int wusb3801_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct fwnode_handle *connector;
+ struct wusb3801 *wusb3801;
+ const char *cap_str;
+ int ret;
+
+ wusb3801 = devm_kzalloc(dev, sizeof(*wusb3801), GFP_KERNEL);
+ if (!wusb3801)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, wusb3801);
+
+ wusb3801->dev = dev;
+
+ wusb3801->regmap = devm_regmap_init_i2c(client, &config);
+ if (IS_ERR(wusb3801->regmap))
+ return PTR_ERR(wusb3801->regmap);
+
+ wusb3801->vbus_supply = devm_regulator_get(dev, "vbus");
+ if (IS_ERR(wusb3801->vbus_supply))
+ return PTR_ERR(wusb3801->vbus_supply);
+
+ connector = device_get_named_child_node(dev, "connector");
+ if (!connector)
+ return -ENODEV;
+
+ ret = typec_get_fw_cap(&wusb3801->cap, connector);
+ if (ret)
+ goto err_put_connector;
+ wusb3801->port_type = wusb3801->cap.type;
+
+ ret = fwnode_property_read_string(connector, "typec-power-opmode", &cap_str);
+ if (ret)
+ goto err_put_connector;
+
+ ret = typec_find_pwr_opmode(cap_str);
+ if (ret < 0 || ret == TYPEC_PWR_MODE_PD)
+ goto err_put_connector;
+ wusb3801->pwr_opmode = ret;
+
+ /* Initialize the hardware with the devicetree settings. */
+ ret = wusb3801_hw_init(wusb3801);
+ if (ret)
+ return ret;
+
+ wusb3801->cap.revision = USB_TYPEC_REV_1_2;
+ wusb3801->cap.accessory[0] = TYPEC_ACCESSORY_AUDIO;
+ wusb3801->cap.accessory[1] = TYPEC_ACCESSORY_DEBUG;
+ wusb3801->cap.orientation_aware = true;
+ wusb3801->cap.driver_data = wusb3801;
+ wusb3801->cap.ops = &wusb3801_typec_ops;
+
+ wusb3801->port = typec_register_port(dev, &wusb3801->cap);
+ if (IS_ERR(wusb3801->port)) {
+ ret = PTR_ERR(wusb3801->port);
+ goto err_put_connector;
+ }
+
+ /* Initialize the port attributes from the hardware state. */
+ wusb3801_hw_update(wusb3801);
+
+ ret = request_threaded_irq(client->irq, NULL, wusb3801_irq,
+ IRQF_ONESHOT, dev_name(dev), wusb3801);
+ if (ret)
+ goto err_unregister_port;
+
+ fwnode_handle_put(connector);
+
+ return 0;
+
+err_unregister_port:
+ typec_unregister_port(wusb3801->port);
+err_put_connector:
+ fwnode_handle_put(connector);
+
+ return ret;
+}
+
+static int wusb3801_remove(struct i2c_client *client)
+{
+ struct wusb3801 *wusb3801 = i2c_get_clientdata(client);
+
+ free_irq(client->irq, wusb3801);
+
+ if (wusb3801->partner)
+ typec_unregister_partner(wusb3801->partner);
+ typec_unregister_port(wusb3801->port);
+
+ if (wusb3801->vbus_on)
+ regulator_disable(wusb3801->vbus_supply);
+
+ return 0;
+}
+
+static const struct of_device_id wusb3801_of_match[] = {
+ { .compatible = "willsemi,wusb3801" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, wusb3801_of_match);
+
+static struct i2c_driver wusb3801_driver = {
+ .probe_new = wusb3801_probe,
+ .remove = wusb3801_remove,
+ .driver = {
+ .name = "wusb3801",
+ .of_match_table = wusb3801_of_match,
+ },
+};
+
+module_i2c_driver(wusb3801_driver);
+
+MODULE_AUTHOR("Samuel Holland <samuel@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Willsemi WUSB3801 Type-C port controller driver");
+MODULE_LICENSE("GPL");
--
2.33.1