usb: typec: driver for TI TPS6598x USB Power Delivery controllers

Driver for TI TPS65982, TPS65983 and other TPS6598x family
stand alone USB Power Delivery controllers.

The driver will at this stage only register the port and
partners attached to it, so cables and alternate modes are
not yet registered. Both power and data role swapping is
supported.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 487 insertions, 0 deletions

diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index 103cb8bce3e7..465d7da849c3 100644
--- a/drivers/usb/typec/Kconfig
+++ b/drivers/usb/typec/Kconfig
@@ -35,4 +35,15 @@ endif
 
 source "drivers/usb/typec/ucsi/Kconfig"
 
+config TYPEC_TPS6598X
+	tristate "TI TPS6598x USB Power Delivery controller driver"
+	depends on I2C
+	select TYPEC
+	help
+	  Say Y or M here if your system has TI TPS65982 or TPS65983 USB Power
+	  Delivery controller.
+
+	  If you choose to build this driver as a dynamically linked module, the
+	  module will be called tps6598x.ko.
+
 endmenu
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index b77688ce1f16..6be5e161ac2b 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_TYPEC_TCPM)	+= tcpm.o
 obj-y				+= fusb302/
 obj-$(CONFIG_TYPEC_WCOVE)	+= typec_wcove.o
 obj-$(CONFIG_TYPEC_UCSI)	+= ucsi/
+obj-$(CONFIG_TYPEC_TPS6598X)	+= tps6598x.o
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
new file mode 100644
index 000000000000..8893f7937560
--- /dev/null
+++ b/drivers/usb/typec/tps6598x.c
@@ -0,0 +1,475 @@
+/*
+ * Driver for TI TPS6598x USB Power Delivery controller family
+ *
+ * Copyright (C) 2017, Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/interrupt.h>
+#include <linux/usb/typec.h>
+
+/* Register offsets */
+#define TPS_REG_CMD1			0x08
+#define TPS_REG_DATA1			0x09
+#define TPS_REG_INT_EVENT1		0x14
+#define TPS_REG_INT_EVENT2		0x15
+#define TPS_REG_INT_MASK1		0x16
+#define TPS_REG_INT_MASK2		0x17
+#define TPS_REG_INT_CLEAR1		0x18
+#define TPS_REG_INT_CLEAR2		0x19
+#define TPS_REG_STATUS			0x1a
+#define TPS_REG_SYSTEM_CONF		0x28
+#define TPS_REG_CTRL_CONF		0x29
+#define TPS_REG_POWER_STATUS		0x3f
+#define TPS_REG_RX_IDENTITY_SOP		0x48
+
+/* TPS_REG_INT_* bits */
+#define TPS_REG_INT_PLUG_EVENT		BIT(3)
+
+/* TPS_REG_STATUS bits */
+#define TPS_STATUS_PLUG_PRESENT		BIT(0)
+#define TPS_STATUS_ORIENTATION		BIT(4)
+#define TPS_STATUS_PORTROLE(s)		(!!((s) & BIT(5)))
+#define TPS_STATUS_DATAROLE(s)		(!!((s) & BIT(6)))
+#define TPS_STATUS_VCONN(s)		(!!((s) & BIT(7)))
+
+/* TPS_REG_SYSTEM_CONF bits */
+#define TPS_SYSCONF_PORTINFO(c)		((c) & 3)
+
+enum {
+	TPS_PORTINFO_SINK,
+	TPS_PORTINFO_SINK_ACCESSORY,
+	TPS_PORTINFO_DRP_UFP,
+	TPS_PORTINFO_DRP_UFP_DRD,
+	TPS_PORTINFO_DRP_DFP,
+	TPS_PORTINFO_DRP_DFP_DRD,
+	TPS_PORTINFO_SOURCE,
+};
+
+/* TPS_REG_POWER_STATUS bits */
+#define TPS_POWER_STATUS_SOURCESINK	BIT(1)
+#define TPS_POWER_STATUS_PWROPMODE(p)	(((p) & GENMASK(3, 2)) >> 2)
+
+/* TPS_REG_RX_IDENTITY_SOP */
+struct tps6598x_rx_identity_reg {
+	u8 status;
+	struct usb_pd_identity identity;
+	u32 vdo[3];
+} __packed;
+
+/* Standard Task return codes */
+#define TPS_TASK_TIMEOUT		1
+#define TPS_TASK_REJECTED		3
+
+/* Unrecognized commands will be replaced with "!CMD" */
+#define INVALID_CMD(_cmd_)		(_cmd_ == 0x444d4321)
+
+struct tps6598x {
+	struct device *dev;
+	struct regmap *regmap;
+	struct mutex lock; /* device lock */
+
+	struct typec_port *port;
+	struct typec_partner *partner;
+	struct usb_pd_identity partner_identity;
+	struct typec_capability typec_cap;
+};
+
+static inline int tps6598x_read16(struct tps6598x *tps, u8 reg, u16 *val)
+{
+	return regmap_raw_read(tps->regmap, reg, val, sizeof(u16));
+}
+
+static inline int tps6598x_read32(struct tps6598x *tps, u8 reg, u32 *val)
+{
+	return regmap_raw_read(tps->regmap, reg, val, sizeof(u32));
+}
+
+static inline int tps6598x_read64(struct tps6598x *tps, u8 reg, u64 *val)
+{
+	return regmap_raw_read(tps->regmap, reg, val, sizeof(u64));
+}
+
+static inline int tps6598x_write16(struct tps6598x *tps, u8 reg, u16 val)
+{
+	return regmap_raw_write(tps->regmap, reg, &val, sizeof(u16));
+}
+
+static inline int tps6598x_write32(struct tps6598x *tps, u8 reg, u32 val)
+{
+	return regmap_raw_write(tps->regmap, reg, &val, sizeof(u32));
+}
+
+static inline int tps6598x_write64(struct tps6598x *tps, u8 reg, u64 val)
+{
+	return regmap_raw_write(tps->regmap, reg, &val, sizeof(u64));
+}
+
+static inline int
+tps6598x_write_4cc(struct tps6598x *tps, u8 reg, const char *val)
+{
+	return regmap_raw_write(tps->regmap, reg, &val, sizeof(u32));
+}
+
+static int tps6598x_read_partner_identity(struct tps6598x *tps)
+{
+	struct tps6598x_rx_identity_reg id;
+	int ret;
+
+	ret = regmap_raw_read(tps->regmap, TPS_REG_RX_IDENTITY_SOP,
+			      &id, sizeof(id));
+	if (ret)
+		return ret;
+
+	tps->partner_identity = id.identity;
+
+	return 0;
+}
+
+static int tps6598x_connect(struct tps6598x *tps, u32 status)
+{
+	struct typec_partner_desc desc;
+	enum typec_pwr_opmode mode;
+	u16 pwr_status;
+	int ret;
+
+	if (tps->partner)
+		return 0;
+
+	ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
+	if (ret < 0)
+		return ret;
+
+	mode = TPS_POWER_STATUS_PWROPMODE(pwr_status);
+
+	desc.usb_pd = mode == TYPEC_PWR_MODE_PD;
+	desc.accessory = TYPEC_ACCESSORY_NONE; /* XXX: handle accessories */
+	desc.identity = NULL;
+
+	if (desc.usb_pd) {
+		ret = tps6598x_read_partner_identity(tps);
+		if (ret)
+			return ret;
+		desc.identity = &tps->partner_identity;
+	}
+
+	tps->partner = typec_register_partner(tps->port, &desc);
+	if (!tps->partner)
+		return -ENODEV;
+
+	typec_set_pwr_opmode(tps->port, mode);
+	typec_set_pwr_role(tps->port, TPS_STATUS_PORTROLE(status));
+	typec_set_vconn_role(tps->port, TPS_STATUS_VCONN(status));
+	typec_set_data_role(tps->port, TPS_STATUS_DATAROLE(status));
+
+	if (desc.identity)
+		typec_partner_set_identity(tps->partner);
+
+	return 0;
+}
+
+static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
+{
+	typec_unregister_partner(tps->partner);
+	tps->partner = NULL;
+	typec_set_pwr_opmode(tps->port, TYPEC_PWR_MODE_USB);
+	typec_set_pwr_role(tps->port, TPS_STATUS_PORTROLE(status));
+	typec_set_vconn_role(tps->port, TPS_STATUS_VCONN(status));
+	typec_set_data_role(tps->port, TPS_STATUS_DATAROLE(status));
+}
+
+static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
+			     size_t in_len, u8 *in_data,
+			     size_t out_len, u8 *out_data)
+{
+	unsigned long timeout;
+	u32 val;
+	int ret;
+
+	ret = tps6598x_read32(tps, TPS_REG_CMD1, &val);
+	if (ret)
+		return ret;
+	if (val && !INVALID_CMD(val))
+		return -EBUSY;
+
+	if (in_len) {
+		ret = regmap_raw_write(tps->regmap, TPS_REG_DATA1,
+				       in_data, in_len);
+		if (ret)
+			return ret;
+	}
+
+	ret = tps6598x_write_4cc(tps, TPS_REG_CMD1, cmd);
+	if (ret < 0)
+		return ret;
+
+	/* XXX: Using 1s for now, but it may not be enough for every command. */
+	timeout = jiffies + msecs_to_jiffies(1000);
+
+	do {
+		ret = tps6598x_read32(tps, TPS_REG_CMD1, &val);
+		if (ret)
+			return ret;
+		if (INVALID_CMD(val))
+			return -EINVAL;
+
+		if (time_is_before_jiffies(timeout))
+			return -ETIMEDOUT;
+	} while (val);
+
+	if (out_len) {
+		ret = regmap_raw_read(tps->regmap, TPS_REG_DATA1,
+				      out_data, out_len);
+		if (ret)
+			return ret;
+		val = out_data[0];
+	} else {
+		ret = regmap_read(tps->regmap, TPS_REG_DATA1, &val);
+		if (ret)
+			return ret;
+	}
+
+	switch (val) {
+	case TPS_TASK_TIMEOUT:
+		return -ETIMEDOUT;
+	case TPS_TASK_REJECTED:
+		return -EPERM;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int
+tps6598x_dr_set(const struct typec_capability *cap, enum typec_data_role role)
+{
+	struct tps6598x *tps = container_of(cap, struct tps6598x, typec_cap);
+	const char *cmd = (role == TYPEC_DEVICE) ? "SWUF" : "SWDF";
+	u32 status;
+	int ret;
+
+	mutex_lock(&tps->lock);
+
+	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL);
+	if (ret)
+		goto out_unlock;
+
+	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
+	if (ret)
+		goto out_unlock;
+
+	if (role != TPS_STATUS_DATAROLE(status)) {
+		ret = -EPROTO;
+		goto out_unlock;
+	}
+
+	typec_set_data_role(tps->port, role);
+
+out_unlock:
+	mutex_unlock(&tps->lock);
+
+	return ret;
+}
+
+static int
+tps6598x_pr_set(const struct typec_capability *cap, enum typec_role role)
+{
+	struct tps6598x *tps = container_of(cap, struct tps6598x, typec_cap);
+	const char *cmd = (role == TYPEC_SINK) ? "SWSk" : "SWSr";
+	u32 status;
+	int ret;
+
+	mutex_lock(&tps->lock);
+
+	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL);
+	if (ret)
+		goto out_unlock;
+
+	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
+	if (ret)
+		goto out_unlock;
+
+	if (role != TPS_STATUS_PORTROLE(status)) {
+		ret = -EPROTO;
+		goto out_unlock;
+	}
+
+	typec_set_pwr_role(tps->port, role);
+
+out_unlock:
+	mutex_unlock(&tps->lock);
+
+	return ret;
+}
+
+static irqreturn_t tps6598x_interrupt(int irq, void *data)
+{
+	struct tps6598x *tps = data;
+	u64 event1;
+	u64 event2;
+	u32 status;
+	int ret;
+
+	mutex_lock(&tps->lock);
+
+	ret = tps6598x_read64(tps, TPS_REG_INT_EVENT1, &event1);
+	ret |= tps6598x_read64(tps, TPS_REG_INT_EVENT2, &event2);
+	if (ret) {
+		dev_err(tps->dev, "%s: failed to read events\n", __func__);
+		goto err_unlock;
+	}
+
+	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
+	if (ret) {
+		dev_err(tps->dev, "%s: failed to read status\n", __func__);
+		goto err_clear_ints;
+	}
+
+	/* Handle plug insert or removal */
+	if ((event1 | event2) & TPS_REG_INT_PLUG_EVENT) {
+		if (status & TPS_STATUS_PLUG_PRESENT) {
+			ret = tps6598x_connect(tps, status);
+			if (ret)
+				dev_err(tps->dev,
+					"failed to register partner\n");
+		} else {
+			tps6598x_disconnect(tps, status);
+		}
+	}
+
+err_clear_ints:
+	tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event1);
+	tps6598x_write64(tps, TPS_REG_INT_CLEAR2, event2);
+
+err_unlock:
+	mutex_unlock(&tps->lock);
+
+	return IRQ_HANDLED;
+}
+
+static const struct regmap_config tps6598x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0x7F,
+};
+
+static int tps6598x_probe(struct i2c_client *client)
+{
+	struct tps6598x *tps;
+	u32 status;
+	u32 conf;
+	u32 vid;
+	int ret;
+
+	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+	if (!tps)
+		return -ENOMEM;
+
+	mutex_init(&tps->lock);
+	tps->dev = &client->dev;
+
+	tps->regmap = devm_regmap_init_i2c(client, &tps6598x_regmap_config);
+	if (IS_ERR(tps->regmap))
+		return PTR_ERR(tps->regmap);
+
+	ret = tps6598x_read32(tps, 0, &vid);
+	if (ret < 0)
+		return ret;
+	if (!vid)
+		return -ENODEV;
+
+	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
+	if (ret < 0)
+		return ret;
+
+	ret = tps6598x_read32(tps, TPS_REG_SYSTEM_CONF, &conf);
+	if (ret < 0)
+		return ret;
+
+	switch (TPS_SYSCONF_PORTINFO(conf)) {
+	case TPS_PORTINFO_SINK_ACCESSORY:
+	case TPS_PORTINFO_SINK:
+		tps->typec_cap.type = TYPEC_PORT_UFP;
+		break;
+	case TPS_PORTINFO_DRP_UFP_DRD:
+	case TPS_PORTINFO_DRP_DFP_DRD:
+		tps->typec_cap.dr_set = tps6598x_dr_set;
+	case TPS_PORTINFO_DRP_UFP:
+	case TPS_PORTINFO_DRP_DFP:
+		tps->typec_cap.pr_set = tps6598x_pr_set;
+		tps->typec_cap.type = TYPEC_PORT_DRP;
+		break;
+	case TPS_PORTINFO_SOURCE:
+		tps->typec_cap.type = TYPEC_PORT_DFP;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	tps->typec_cap.revision = USB_TYPEC_REV_1_2;
+	tps->typec_cap.pd_revision = 0x200;
+	tps->typec_cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;
+
+	tps->port = typec_register_port(&client->dev, &tps->typec_cap);
+	if (!tps->port)
+		return -ENODEV;
+
+	if (status & TPS_STATUS_PLUG_PRESENT) {
+		ret = tps6598x_connect(tps, status);
+		if (ret)
+			dev_err(&client->dev, "failed to register partner\n");
+	}
+
+	ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+					tps6598x_interrupt,
+					IRQF_SHARED | IRQF_ONESHOT,
+					dev_name(&client->dev), tps);
+	if (ret) {
+		tps6598x_disconnect(tps, 0);
+		typec_unregister_port(tps->port);
+		return ret;
+	}
+
+	i2c_set_clientdata(client, tps);
+
+	return 0;
+}
+
+static int tps6598x_remove(struct i2c_client *client)
+{
+	struct tps6598x *tps = i2c_get_clientdata(client);
+
+	tps6598x_disconnect(tps, 0);
+	typec_unregister_port(tps->port);
+
+	return 0;
+}
+
+static const struct acpi_device_id tps6598x_acpi_match[] = {
+	{ "INT3515", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, tps6598x_acpi_match);
+
+static struct i2c_driver tps6598x_i2c_driver = {
+	.driver = {
+		.name = "tps6598x",
+		.acpi_match_table = tps6598x_acpi_match,
+	},
+	.probe_new = tps6598x_probe,
+	.remove = tps6598x_remove,
+};
+module_i2c_driver(tps6598x_i2c_driver);
+
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("TI TPS6598x USB Power Delivery Controller Driver");