[PATCHv3 1/2] usb: USB Type-C connector class

[Heikki Krogerus]

The purpose of USB Type-C connector class is to provide
unified interface for the user space to get the status and
basic information about USB Type-C connectors on a system,
control over data role swapping, and when USB PD is
available, also control over power role swapping and
Alternate Modes.

Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-class-typec |  163 ++++
 Documentation/usb/typec.txt                 |  101 +++
 MAINTAINERS                                 |    9 +
 drivers/usb/Kconfig                         |    2 +
 drivers/usb/Makefile                        |    2 +
 drivers/usb/typec/Kconfig                   |    7 +
 drivers/usb/typec/Makefile                  |    1 +
 drivers/usb/typec/typec.c                   | 1173 +++++++++++++++++++++++++++
 include/linux/usb/typec.h                   |  255 ++++++
 9 files changed, 1713 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-typec
 create mode 100644 Documentation/usb/typec.txt
 create mode 100644 drivers/usb/typec/Kconfig
 create mode 100644 drivers/usb/typec/Makefile
 create mode 100644 drivers/usb/typec/typec.c
 create mode 100644 include/linux/usb/typec.h

diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
new file mode 100644
index 0000000..ce577f3
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -0,0 +1,163 @@
+USB Type-C port devices (eg. /sys/class/typec/usbc0/)
+
+What:		/sys/class/typec/<port>/current_data_role
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		The current USB data role the port is operating in. This
+		attribute can be used for requestion data role swapping on th
+		port.
+
+What:		/sys/class/typec/<port>/current_power_role
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		The current power role, source or sink, of the port. This
+		attribute can be used to request power role swap on the port
+		when USB Power Delivery is available.
+
+What:		/sys/class/typec/<port>/current_vconn_role
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the current VCONN role, source or sink, of the port. This
+		attribute can be used to request vconn role swap on the port
+		when USB Power Delivery is available.
+
+What:		/sys/class/typec/<port>/power_operation_mode
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the current power power mode the port is in. Reads as on
+		of the following:
+		- USB - Normal power levels defined in USB specifications
+		- BC1.2 - Power levels defined in Battery Charging Specification
+			  v1.2
+		- USB Type-C 1.5A - Higher 1.5A current defined in USB Type-C
+				    specification.
+		- USB Type-C 3.0A - Higher 3A current defined in USB Type-C
+				    specification.
+                - USB Power Delivery - The voltages and currents defined in USB
+				       Power Delivery specification
+
+What:		/sys/class/typec/<port>/preferred_role
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		The user space can notify the driver about the preferred role.
+		It should be handled as enabling of Try.SRC or Try.SNK, as
+		defined in USB Type-C specification, in the port drivers.
+
+What:		/sys/class/typec/<port>/supported_accessory_modes
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Lists the Accessory Modes, defined in the USB Type-C
+		specification, the port supports.
+
+What:		/sys/class/typec/<port>/supported_data_roles
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Lists the USB data roles, host or device, the port is capable
+		of supporting.
+
+What:		/sys/class/typec/<port>/supported_power_roles
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Lists the power roles, source and/or sink, the port is capable
+		of supporting.
+
+What:		/sys/class/typec/<port>/supports_usb_power_delivery
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows if the port support USB Power Delivery.
+
+
+USB Type-C partner devices (eg. /sys/class/typec/usbc0-partner/)
+
+What:		/sys/class/typec/<port>-partner/accessory
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the name of the Accessory Mode if the partner attached to
+		the port is an accessory. Otherwise shows nothing.
+
+What:		/sys/class/typec/<port>-partner/type
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the type of the partner. Can be one of the following:
+		- USB - When the partner is normal USB host/peripheral.
+		- Charger - When the partner has been identified as dedicated
+			    charger.
+		- Alternate Mode - When the partner supports Alternate Modes.
+		- Accessory - When the partner is one of the accessories with
+			      specific Accessory Mode defined in USB Type-C
+			      specification.
+
+
+USB Type-C cable devices (eg. /sys/class/typec/usbc0-cable/)
+
+Note: The two cable plugs will have their own devices presenting when available
+(eg. /sys/class/typec/usbc0-plug0). Both plugs may have their own active
+alternate modes as described in USB Type-C and USB Power Delivery
+specifications.
+
+What:		/sys/class/typec/<port>-cable/active
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows if the cable is active or passive. Only active cables can
+		have configurable alternate modes, therefore only active cables
+		will have plug devices.
+
+What:		/sys/class/typec/<port>-cable/plug_type
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows type of the plug on the cable:
+		Type-A - Standard A
+		Type-B - Standard B
+		Type-C - USB Type-C
+		Captive - Non-standard
+
+
+Alternate Mode devices  (For example,
+/sys/class/typec/usbc0-partner/usbc0-partner.svid:xxxx/)
+
+What:		/sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/active
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows if the mode is active or not. The attribute can be used
+		for entering/exiting the mode with partners and cable plugs, and
+		with the port alternate modes it can be used for disabling
+		support for specific alternate modes.
+
+What:		/sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/description
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows description of the mode. The description is optional for
+		the drivers, just like with the Billboard Devices.
+
+What:		/sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/vdo
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the VDO in hexadecimal returned from the Discover Modes
+		command.
+
+What:		/sys/class/typec/<port>/<port>.svid:<svid>/<mode>/supported_roles
+Data:		June 2016
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the roles, source or sink, the mode is supported with.
+
+		This attribute is available for the devices describing the
+		alternate modes a port supports, and it will not be exposed with
+		the devices presenting the alternate modes the partners or cable
+		plugs support.
diff --git a/Documentation/usb/typec.txt b/Documentation/usb/typec.txt
new file mode 100644
index 0000000..ddeda97
--- /dev/null
+++ b/Documentation/usb/typec.txt
@@ -0,0 +1,101 @@
+USB Type-C connector class
+==========================
+
+Introduction
+------------
+The typec class is meant for describing the USB Type-C ports in a system to the
+user space in unified fashion. The class is designed to provide nothing else
+expect the user space interface implementation in hope that it can be utilized
+on as many platforms as possible.
+
+The platforms are expected to register every USB Type-C port they have with the
+class. In a normal case the registration will be done by a USB Type-C or PD PHY
+driver, but it may be a driver for firmware interface such as UCSI, driver for
+USB PD controller or even driver for Thunderbolt3 controller. This document
+considers the component registering the USB Type-C ports with the class as "port
+driver".
+
+On top of showing the capabilities, the class also offers the user space control
+over the roles and alternate modes they support when the port driver is capable
+of supporting those features.
+
+The class provides an API for the port drivers described in this document. The
+attributes are described in Documentation/ABI/testing/sysfs-class-typec.
+
+
+Interface
+---------
+Every port will be presented as its own device under /sys/class/typec/. The
+first port will be named "usbc0", the second "usbc1" and so on.
+
+When connected, the partner will be presented also as its own device under
+/sys/class/typec/. The parent of the partner device will always be the port. The
+partner attached to port "usbc0" will be named "usbc0-partner".
+
+The cable and the two plugs on it may also be optionally be presented as their
+own devices under /sys/class/typec/. The cable attached to the port "usbc0" port
+will be named usbc0-cable and the plug on the SOP Prime end (see USB Power
+Delivery Specification ch. 2.4) will be named "usbc-plug0" and on the SOP Double
+Prime end "usbc0-plug1".
+
+If the port, partner or cable plug support Alternate Modes, every Alternate Mode
+SVID will have their own device describing them. The Alternate Modes will not be
+attached to the typec class. For the port's "usbc0" partner, the Alternate Modes
+would have devices presented under /sys/class/typec/usbc0-partner/. Every mode
+that is supported will have its own group under the Alternate Mode device named
+"mode<id>". For example /sys/class/typec/usbc0/usbc0.svid:xxxx/mode0/. The
+requests for entering/exiting the modes happens with the "active" attribute in
+that group.
+
+
+API
+---
+
+* Registering the ports
+
+The port drivers will describe every Type-C port they control with struct
+typec_capability data structure, and register them with the following API:
+
+struct typec_port *typec_register_port(struct device *dev,
+				       const struct typec_capability *cap);
+
+The class will provide handle to struct typec_port on success and ERR_PTR on
+failure. The un-registration of the port happens with the following API:
+
+void typec_unregister_port(struct typec_port *port);
+
+
+* Notifications
+
+When connection happens on a port, the port driver fills struct typec_connection
+which is passed to the class. The class provides the following API for reporting
+connection/disconnection:
+
+int typec_connect(struct typec_port *port, struct typec_connection *);
+void typec_disconnect(struct typec_port *);
+
+When the partner end has executed a role change, the port driver uses the
+following APIs to report it to the class:
+
+void typec_set_data_role(struct typec_port *, enum typec_data_role);
+void typec_set_pwr_role(struct typec_port *, enum typec_role);
+void typec_set_vconn_role(struct typec_port *, enum typec_role);
+void typec_set_pwr_opmode(struct typec_port *, enum typec_pwr_opmode);
+
+
+* Alternate Modes
+
+After connection, the port drivers register the alternate modes the partner
+and/or cable plugs support. And before reporting disconnection, the port driver
+_must_ unregister all the alternate modes registered for the partner and cable
+plugs. The API takes the struct device of the partner or the cable plug as
+parameter:
+
+int typec_register_altmodes(struct device *, struct typec_altmode *);
+void typec_unregister_altmodes(struct device *);
+
+When the partner end enters or exits the modes, the port driver needs to notify
+the class with the following API:
+
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+				 bool active);
diff --git a/MAINTAINERS b/MAINTAINERS
index e1b090f..0db33fb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11983,6 +11983,15 @@ F:	drivers/usb/
 F:	include/linux/usb.h
 F:	include/linux/usb/
 
+USB TYPEC SUBSYSTEM
+M:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+L:	linux-usb@xxxxxxxxxxxxxxx
+S:	Maintained
+F:	Documentation/ABI/testing/sysfs-class-typec
+F:	Documentation/usb/typec.txt
+F:	drivers/usb/typec/
+F:	include/linux/usb/typec.h
+
 USB UHCI DRIVER
 M:	Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
 L:	linux-usb@xxxxxxxxxxxxxxx
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 8689dcb..f42a3d3 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -150,6 +150,8 @@ source "drivers/usb/phy/Kconfig"
 
 source "drivers/usb/gadget/Kconfig"
 
+source "drivers/usb/typec/Kconfig"
+
 config USB_LED_TRIG
 	bool "USB LED Triggers"
 	depends on LEDS_CLASS && USB_COMMON && LEDS_TRIGGERS
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index dca7856..51e381e 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -61,3 +61,5 @@ obj-$(CONFIG_USB_GADGET)	+= gadget/
 obj-$(CONFIG_USB_COMMON)	+= common/
 
 obj-$(CONFIG_USBIP_CORE)	+= usbip/
+
+obj-$(CONFIG_TYPEC)		+= typec/
diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
new file mode 100644
index 0000000..b229fb9
--- /dev/null
+++ b/drivers/usb/typec/Kconfig
@@ -0,0 +1,7 @@
+
+menu "USB PD and Type-C drivers"
+
+config TYPEC
+	tristate
+
+endmenu
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
new file mode 100644
index 0000000..1012a8b
--- /dev/null
+++ b/drivers/usb/typec/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_TYPEC)		+= typec.o
diff --git a/drivers/usb/typec/typec.c b/drivers/usb/typec/typec.c
new file mode 100644
index 0000000..c6363bf
--- /dev/null
+++ b/drivers/usb/typec/typec.c
@@ -0,0 +1,1173 @@
+/*
+ * USB Type-C Connector Class
+ *
+ * Copyright (C) 2016, Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+ *
+ * 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/device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb/typec.h>
+
+struct typec_port {
+	unsigned int		id;
+	struct device		dev;
+	struct mutex		lock; /* device lock */
+
+	int			prefer_role;
+
+	enum typec_data_role	data_role;
+	enum typec_role		pwr_role;
+	enum typec_role		vconn_role;
+	enum typec_pwr_opmode	pwr_opmode;
+
+	struct typec_partner	*partner;
+	struct typec_cable	*cable;
+
+	unsigned int		connected:1;
+
+	const struct typec_capability *cap;
+};
+
+#define to_typec_port(p) container_of(p, struct typec_port, dev)
+
+static DEFINE_IDA(typec_index_ida);
+
+static struct class typec_class = {
+	.name = "typec",
+};
+
+static const char * const typec_accessory_modes[] = {
+	[TYPEC_ACCESSORY_NONE]		= "none",
+	[TYPEC_ACCESSORY_AUDIO]		= "Audio",
+	[TYPEC_ACCESSORY_DEBUG]		= "Debug",
+	[TYPEC_ACCESSORY_DAUDIO]	= "Digital Audio",
+};
+
+/* -------------------------------- */
+/* Type-C Partners */
+
+static void typec_dev_release(struct device *dev)
+{
+}
+
+static const char * const typec_partner_types[] = {
+	[TYPEC_PARTNER_USB]		= "USB",
+	[TYPEC_PARTNER_CHARGER]		= "Charger",
+	[TYPEC_PARTNER_ALTMODE]		= "Alternate Mode",
+	[TYPEC_PARTNER_ACCESSORY]	= "Accessory",
+};
+
+static ssize_t partner_type_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct typec_partner *partner = container_of(dev, struct typec_partner,
+						     dev);
+
+	return sprintf(buf, "%s\n", typec_partner_types[partner->type]);
+}
+
+static struct device_attribute dev_attr_partner_type = {
+	.attr = {
+		.name = "type",
+		.mode = S_IRUGO,
+	},
+	.show = partner_type_show,
+};
+
+static ssize_t
+partner_accessory_mode_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct typec_partner *partner = container_of(dev, struct typec_partner,
+						     dev);
+
+	return sprintf(buf, "%s\n", typec_accessory_modes[partner->accessory]);
+}
+
+static struct device_attribute dev_attr_partner_accessory = {
+	.attr = {
+		.name = "accessory",
+		.mode = S_IRUGO,
+	},
+	.show = partner_accessory_mode_show,
+};
+
+static struct attribute *typec_partner_attrs[] = {
+	&dev_attr_partner_type.attr,
+	&dev_attr_partner_accessory.attr,
+	NULL
+};
+
+static struct attribute_group typec_partner_group = {
+	.attrs = typec_partner_attrs,
+};
+
+static const struct attribute_group *typec_partner_groups[] = {
+	&typec_partner_group,
+	NULL
+};
+
+static struct device_type typec_partner_dev_type = {
+	.name = "typec_partner_device",
+	.groups = typec_partner_groups,
+	.release = typec_dev_release,
+};
+
+static int
+typec_add_partner(struct typec_port *port, struct typec_partner *partner)
+{
+	struct device *dev = &partner->dev;
+	int ret;
+
+	dev->class = &typec_class;
+	dev->parent = &port->dev;
+	dev->type = &typec_partner_dev_type;
+	dev_set_name(dev, "%s-partner", dev_name(&port->dev));
+
+	ret = device_register(dev);
+	if (ret) {
+		put_device(dev);
+		return ret;
+	}
+
+	port->partner = partner;
+	return 0;
+}
+
+static void typec_remove_partner(struct typec_port *port)
+{
+	WARN_ON(port->partner->alt_modes);
+	device_unregister(&port->partner->dev);
+}
+
+/* ------------------------------------------------------------------------- */
+/* Type-C Cable Plugs */
+
+static struct device_type typec_plug_dev_type = {
+	.name = "type_plug_device",
+	.release = typec_dev_release,
+};
+
+static int
+typec_add_plug(struct typec_port *port, struct typec_plug *plug)
+{
+	struct device *dev = &plug->dev;
+	char name[8];
+	int ret;
+
+	sprintf(name, "plug%d", plug->index);
+
+	dev->class = &typec_class;
+	dev->parent = &port->cable->dev;
+	dev->type = &typec_plug_dev_type;
+	dev_set_name(dev, "%s-%s", dev_name(&port->dev), name);
+
+	ret = device_register(dev);
+	if (ret) {
+		put_device(dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void typec_remove_plug(struct typec_plug *plug)
+{
+	WARN_ON(plug->alt_modes);
+	device_unregister(&plug->dev);
+}
+
+static ssize_t
+active_cable_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+	return sprintf(buf, "%d\n", cable->active);
+}
+
+static struct device_attribute dev_attr_active_cable = {
+	.attr = {
+		.name = "active",
+		.mode = S_IRUGO,
+	},
+	.show = active_cable_show,
+};
+
+static const char * const typec_plug_types[] = {
+	[USB_PLUG_NONE]		= "unknown",
+	[USB_PLUG_TYPE_A]	= "Type-A",
+	[USB_PLUG_TYPE_B]	= "Type-B",
+	[USB_PLUG_TYPE_C]	= "Type-C",
+	[USB_PLUG_CAPTIVE]	= "Captive",
+};
+
+static ssize_t
+cable_plug_type_show(struct device *dev, struct device_attribute *attr,
+		     char *buf)
+{
+	struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+	return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
+}
+
+static struct device_attribute dev_attr_plug_type = {
+	.attr = {
+		.name = "plug_type",
+		.mode = S_IRUGO,
+	},
+	.show = cable_plug_type_show,
+};
+
+static struct attribute *typec_cable_attrs[] = {
+	&dev_attr_active_cable.attr,
+	&dev_attr_plug_type.attr,
+	NULL
+};
+
+static struct attribute_group typec_cable_group = {
+	.attrs = typec_cable_attrs,
+};
+
+static const struct attribute_group *typec_cable_groups[] = {
+	&typec_cable_group,
+	NULL
+};
+
+static struct device_type typec_cable_dev_type = {
+	.name = "typec_cable_device",
+	.groups = typec_cable_groups,
+	.release = typec_dev_release,
+};
+
+static int typec_add_cable(struct typec_port *port, struct typec_cable *cable)
+{
+	struct device *dev = &cable->dev;
+	int ret;
+
+	dev->class = &typec_class;
+	dev->parent = &port->dev;
+	dev->type = &typec_cable_dev_type;
+	dev_set_name(dev, "%s-cable", dev_name(&port->dev));
+
+	ret = device_register(dev);
+	if (ret) {
+		put_device(dev);
+		return ret;
+	}
+
+	/* Plug1 */
+	if (!cable->active)
+		return 0;
+
+	cable->plug[0].index = 1;
+	ret = typec_add_plug(port, &cable->plug[0]);
+	if (ret) {
+		device_unregister(dev);
+		return ret;
+	}
+
+	/* Plug2 */
+	if (!cable->sop_pp_controller)
+		return 0;
+
+	cable->plug[1].index = 2;
+	ret = typec_add_plug(port, &cable->plug[1]);
+	if (ret) {
+		typec_remove_plug(&cable->plug[0]);
+		device_unregister(dev);
+		return ret;
+	}
+
+	port->cable = cable;
+	return 0;
+}
+
+static void typec_remove_cable(struct typec_port *port)
+{
+	if (port->cable->active) {
+		typec_remove_plug(&port->cable->plug[0]);
+		if (port->cable->sop_pp_controller)
+			typec_remove_plug(&port->cable->plug[1]);
+	}
+	device_unregister(&port->cable->dev);
+}
+
+static void typec_init_roles(struct typec_port *port)
+{
+	if (port->prefer_role < 0)
+		return;
+
+	if (port->prefer_role == TYPEC_SOURCE) {
+		port->data_role = TYPEC_HOST;
+		port->pwr_role = TYPEC_SOURCE;
+		port->vconn_role = TYPEC_SOURCE;
+	} else {
+		/* Device mode as default also by default with DRP ports */
+		port->data_role = TYPEC_DEVICE;
+		port->pwr_role = TYPEC_SINK;
+		port->vconn_role = TYPEC_SINK;
+	}
+}
+
+/* ------------------------------------------------------------------------- */
+/* API for the port drivers */
+
+int typec_connect(struct typec_port *port, struct typec_connection *con)
+{
+	int ret;
+
+	if (!con->partner && !con->cable)
+		return -EINVAL;
+
+	port->connected = 1;
+	port->data_role = con->data_role;
+	port->pwr_role = con->pwr_role;
+	port->vconn_role = con->vconn_role;
+	port->pwr_opmode = con->pwr_opmode;
+
+	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+
+	if (con->cable) {
+		ret = typec_add_cable(port, con->cable);
+		if (ret)
+			return ret;
+	}
+
+	if (con->partner) {
+		ret = typec_add_partner(port, con->partner);
+		if (ret) {
+			if (con->cable)
+				typec_remove_cable(port);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(typec_connect);
+
+void typec_disconnect(struct typec_port *port)
+{
+	if (port->partner)
+		typec_remove_partner(port);
+
+	if (port->cable)
+		typec_remove_cable(port);
+
+	port->connected = 0;
+	port->partner = NULL;
+	port->cable = NULL;
+
+	port->pwr_opmode = TYPEC_PWR_MODE_USB;
+
+	typec_init_roles(port);
+
+	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_disconnect);
+
+/* --------------------------------------- */
+/* Driver callbacks to report role updates */
+
+void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
+{
+	mutex_lock(&port->lock);
+	port->data_role = role;
+	sysfs_notify(&port->dev.kobj, NULL, "current_data_role");
+	mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_data_role);
+
+void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
+{
+	mutex_lock(&port->lock);
+	port->pwr_role = role;
+	sysfs_notify(&port->dev.kobj, NULL, "current_power_role");
+	mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_pwr_role);
+
+void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
+{
+	mutex_lock(&port->lock);
+	port->vconn_role = role;
+	sysfs_notify(&port->dev.kobj, NULL, "current_vconn_role");
+	mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_vconn_role);
+
+void typec_set_pwr_opmode(struct typec_port *port,
+			  enum typec_pwr_opmode opmode)
+{
+	mutex_lock(&port->lock);
+	port->pwr_opmode = opmode;
+	sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
+	mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_pwr_opmode);
+
+/* -------------------------------- */
+/* Alternate Modes */
+
+/*
+ * typec_altmode_update_active - Notify about Enter/Exit mode
+ * @alt: Handle to the Alternate Mode
+ * @mode: Mode id
+ * @active: True when the mode has been enterred
+ */
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+				 bool active)
+{
+	struct typec_port *port = typec_altmode2port(alt);
+	struct typec_mode *m = alt->modes + mode;
+	char dir[6];
+
+	mutex_lock(&port->lock);
+	m->active = active;
+	sprintf(dir, "mode%d", mode);
+	sysfs_notify(&alt->dev.kobj, dir, "active");
+	mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_altmode_update_active);
+
+static struct device_type typec_port_dev_type;
+
+/*
+ * typec_altmode2port - Alternate Mode to USB Type-C port
+ * @alt: The Alternate Mode
+ *
+ * Returns the port that the cable plug or partner with @alt is connected to.
+ */
+struct typec_port *typec_altmode2port(struct typec_altmode *alt)
+{
+	if (alt->dev.parent->type == &typec_plug_dev_type)
+		return to_typec_port(alt->dev.parent->parent->parent);
+	if (alt->dev.parent->type == &typec_partner_dev_type)
+		return to_typec_port(alt->dev.parent->parent);
+	if (alt->dev.parent->type == &typec_port_dev_type)
+		return to_typec_port(alt->dev.parent);
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(typec_altmode2port);
+
+static void typec_altmode_release(struct device *dev)
+{
+	struct typec_altmode *alt = to_altmode(dev);
+
+	kfree(alt->mode_groups);
+}
+
+static ssize_t
+typec_altmode_vdo_show(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct typec_mode *mode = container_of(attr, struct typec_mode,
+					       vdo_attr);
+	struct typec_port *port = typec_altmode2port(mode->alt_mode);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "0x%08x\n", mode->vdo);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+
+static ssize_t
+typec_altmode_desc_show(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct typec_mode *mode = container_of(attr, struct typec_mode,
+					       desc_attr);
+	struct typec_port *port = typec_altmode2port(mode->alt_mode);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%s\n", mode->desc ? mode->desc : "");
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+
+static ssize_t
+typec_altmode_active_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct typec_mode *mode = container_of(attr, struct typec_mode,
+					       active_attr);
+	struct typec_port *port = typec_altmode2port(mode->alt_mode);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%d\n", mode->active);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+
+static ssize_t
+typec_altmode_active_store(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t size)
+{
+	struct typec_mode *mode = container_of(attr, struct typec_mode,
+					       active_attr);
+	struct typec_port *port = typec_altmode2port(mode->alt_mode);
+	bool activate;
+	int ret;
+
+	ret = kstrtobool(buf, &activate);
+	if (ret)
+		return ret;
+
+	if (activate > 1)
+		return -EINVAL;
+
+	mutex_lock(&port->lock);
+	ret = port->cap->activate_mode(mode->alt_mode, mode->index, activate);
+	if (!ret) {
+		mode->active = activate;
+		ret = size;
+	}
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+
+static ssize_t
+typec_altmode_roles_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct typec_mode *mode = container_of(attr, struct typec_mode,
+					       roles_attr);
+	struct typec_port *port = typec_altmode2port(mode->alt_mode);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	switch (mode->roles) {
+	case TYPEC_PORT_DFP:
+		ret =  sprintf(buf, "source\n");
+		break;
+	case TYPEC_PORT_UFP:
+		ret = sprintf(buf, "sink\n");
+		break;
+	case TYPEC_PORT_DRP:
+	default:
+		ret = sprintf(buf, "source, sink\n");
+		break;
+	}
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+
+static void typec_init_modes(struct typec_altmode *alt, int is_port)
+{
+	struct typec_mode *mode = alt->modes;
+	int i;
+
+	for (i = 0; i < alt->n_modes; i++, mode++) {
+		mode->alt_mode = alt;
+		mode->index = i;
+		sprintf(mode->group_name, "mode%d", i);
+
+		sysfs_attr_init(&mode->vdo_attr.attr);
+		mode->vdo_attr.attr.name = "vdo";
+		mode->vdo_attr.attr.mode = S_IRUGO;
+		mode->vdo_attr.show = typec_altmode_vdo_show;
+
+		sysfs_attr_init(&mode->desc_attr.attr);
+		mode->desc_attr.attr.name = "description";
+		mode->desc_attr.attr.mode = S_IRUGO;
+		mode->desc_attr.show = typec_altmode_desc_show;
+
+		sysfs_attr_init(&mode->active_attr.attr);
+		mode->active_attr.attr.name = "active";
+		mode->active_attr.attr.mode = S_IWUSR | S_IRUGO;
+		mode->active_attr.show = typec_altmode_active_show;
+		mode->active_attr.store = typec_altmode_active_store;
+
+		mode->attrs[0] = &mode->vdo_attr.attr;
+		mode->attrs[1] = &mode->desc_attr.attr;
+		mode->attrs[2] = &mode->active_attr.attr;
+
+		/* With ports, list the roles that the mode is supported with */
+		if (is_port) {
+			sysfs_attr_init(&mode->roles_attr.attr);
+			mode->roles_attr.attr.name = "supported_roles";
+			mode->roles_attr.attr.mode = S_IRUGO;
+			mode->roles_attr.show = typec_altmode_roles_show;
+
+			mode->attrs[3] = &mode->roles_attr.attr;
+		}
+
+		mode->group.attrs = mode->attrs;
+		mode->group.name = mode->group_name;
+
+		alt->mode_groups[i] = &mode->group;
+	}
+}
+
+static int
+typec_add_altmode(struct device *parent, struct typec_altmode *alt, int is_port)
+{
+	struct device *dev = &alt->dev;
+	int ret;
+
+	alt->mode_groups = kcalloc(alt->n_modes + 1,
+				   sizeof(struct attibute_group *), GFP_KERNEL);
+	if (!alt->mode_groups)
+		return -ENOMEM;
+
+	typec_init_modes(alt, is_port);
+
+	dev->groups = alt->mode_groups;
+	dev->release = typec_altmode_release;
+	dev->parent = parent;
+	/* TODO: if (!is_port) dev->bus = &typec_altmode_bus; */
+
+	dev_set_name(dev, "%s.svid:%04x", dev_name(parent), alt->svid);
+
+	ret = device_register(dev);
+	if (ret) {
+		put_device(dev);
+		kfree(alt->mode_groups);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __typec_register_altmodes(struct device *parent,
+				     struct typec_altmode *alt_modes,
+				     int is_port)
+{
+	struct typec_altmode *alt;
+	int index;
+	int ret;
+
+	if (!alt_modes)
+		return 0;
+
+	for (alt = alt_modes, index = 0; alt->svid; alt++, index++) {
+		ret = typec_add_altmode(parent, alt, is_port);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+err:
+	for (alt = alt_modes + index; index; alt--, index--)
+		device_unregister(&alt->dev);
+
+	return ret;
+}
+
+int typec_register_altmodes(struct device *dev, struct typec_altmode *alt_modes)
+{
+	if (dev->type == &typec_partner_dev_type) {
+		struct typec_partner *p = container_of(dev,
+						       struct typec_partner,
+						       dev);
+		p->alt_modes = alt_modes;
+	} else if (dev->type == &typec_plug_dev_type) {
+		struct typec_plug *p = container_of(dev, struct typec_plug,
+						    dev);
+		p->alt_modes = alt_modes;
+	} else {
+		return -ENODEV;
+	}
+
+	return __typec_register_altmodes(dev, alt_modes, false);
+}
+EXPORT_SYMBOL_GPL(typec_register_altmodes);
+
+void typec_unregister_altmodes(struct device *dev)
+{
+	struct typec_altmode *alt_modes = NULL;
+	struct typec_altmode *alt;
+
+	if (dev->type == &typec_partner_dev_type) {
+		struct typec_partner *p = container_of(dev,
+						       struct typec_partner,
+						       dev);
+		alt_modes = p->alt_modes;
+	} else if (dev->type == &typec_plug_dev_type) {
+		struct typec_plug *p = container_of(dev, struct typec_plug,
+						    dev);
+		alt_modes = p->alt_modes;
+	}
+
+	if (!alt_modes)
+		return;
+
+	for (alt = alt_modes; alt->svid; alt++)
+		device_unregister(&alt->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_altmodes);
+
+/* ------------------------------------------------------------------------- */
+
+static const char * const typec_roles[] = {
+	[TYPEC_SINK]	= "sink",
+	[TYPEC_SOURCE]	= "source",
+};
+
+static const char * const typec_data_roles[] = {
+	[TYPEC_DEVICE]	= "device",
+	[TYPEC_HOST]	= "host",
+};
+
+static ssize_t
+preferred_role_store(struct device *dev, struct device_attribute *attr,
+		     const char *buf, size_t size)
+{
+	struct typec_port *port = to_typec_port(dev);
+	enum typec_role role;
+	int ret;
+
+	mutex_lock(&port->lock);
+
+	if (port->cap->type != TYPEC_PORT_DRP) {
+		dev_dbg(dev, "Preferred role only supported with DRP ports\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!port->cap->try_role) {
+		dev_dbg(dev, "Setting preferred role not supported\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	ret = match_string(typec_roles, ARRAY_SIZE(typec_roles), buf);
+	if (ret < 0) {
+		port->prefer_role = -1;
+		ret = size;
+		goto out;
+	}
+
+	role = ret;
+
+	ret = port->cap->try_role(port->cap, role);
+	if (ret)
+		goto out;
+
+	port->prefer_role = role;
+	ret = size;
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+
+static ssize_t
+preferred_role_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret = 0;
+
+	mutex_lock(&port->lock);
+
+	if (port->prefer_role < 0)
+		goto out;
+
+	ret = sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+static DEVICE_ATTR_RW(preferred_role);
+
+static ssize_t
+current_data_role_store(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t size)
+{
+	struct typec_port *port = to_typec_port(dev);
+	int ret = size;
+
+	mutex_lock(&port->lock);
+
+	if (port->cap->type != TYPEC_PORT_DRP) {
+		dev_dbg(dev, "data role swap only supported with DRP ports\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!port->cap->dr_set) {
+		dev_dbg(dev, "data role swapping not supported\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!port->connected)
+		goto out;
+
+	ret = match_string(typec_data_roles, ARRAY_SIZE(typec_data_roles), buf);
+	if (ret < 0)
+		goto out;
+
+	ret = port->cap->dr_set(port->cap, ret);
+	if (ret)
+		goto out;
+
+	ret = size;
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+
+static ssize_t
+current_data_role_show(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%s\n", typec_data_roles[port->data_role]);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RW(current_data_role);
+
+static ssize_t supported_data_roles_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	size_t ret;
+
+	mutex_lock(&port->lock);
+
+	if (port->cap->type == TYPEC_PORT_DRP) {
+		ret = sprintf(buf, "host, device\n");
+		goto out;
+	}
+
+	ret = sprintf(buf, "%s\n", typec_data_roles[port->data_role]);
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+static DEVICE_ATTR_RO(supported_data_roles);
+
+static ssize_t current_power_role_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t size)
+{
+	struct typec_port *port = to_typec_port(dev);
+	int ret = size;
+
+	mutex_lock(&port->lock);
+
+	if (!port->cap->usb_pd) {
+		dev_dbg(dev, "power role swap only supported with USB PD\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!port->cap->pr_set) {
+		dev_dbg(dev, "power role swapping not supported\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
+		dev_dbg(dev, "partner unable to swap power role\n");
+		ret = -EIO;
+		goto out;
+	}
+
+	if (!port->connected)
+		goto out;
+
+	ret = match_string(typec_roles, ARRAY_SIZE(typec_roles), buf);
+	if (ret < 0)
+		goto out;
+
+	ret = port->cap->pr_set(port->cap, ret);
+	if (ret)
+		goto out;
+
+	ret = size;
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+
+static ssize_t current_power_role_show(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%s\n", typec_roles[port->pwr_role]);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RW(current_power_role);
+
+static ssize_t supported_power_roles_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	size_t ret;
+
+	mutex_lock(&port->lock);
+
+	if (port->cap->usb_pd || port->cap->type == TYPEC_PORT_DRP) {
+		ret = sprintf(buf, "source, sink\n");
+		goto out;
+	}
+
+	ret = sprintf(buf, "%s\n", typec_roles[port->pwr_role]);
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+static DEVICE_ATTR_RO(supported_power_roles);
+
+static const char * const typec_pwr_opmodes[] = {
+	[TYPEC_PWR_MODE_USB]	= "USB",
+	[TYPEC_PWR_MODE_BC1_2]	= "BC1.2",
+	[TYPEC_PWR_MODE_1_5A]	= "USB Type-C 1.5A",
+	[TYPEC_PWR_MODE_3_0A]	= "USB Type-C 3.0A",
+	[TYPEC_PWR_MODE_PD]	= "USB Power Delivery",
+};
+
+static ssize_t power_operation_mode_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RO(power_operation_mode);
+
+static ssize_t current_vconn_role_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t size)
+{
+	struct typec_port *port = to_typec_port(dev);
+	int ret;
+
+	mutex_lock(&port->lock);
+
+	if (!port->cap->usb_pd) {
+		dev_dbg(dev, "vconn swap only supported with USB PD\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!port->cap->vconn_set) {
+		dev_dbg(dev, "vconn swapping not supported\n");
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
+	ret = match_string(typec_roles, ARRAY_SIZE(typec_roles), buf);
+	if (ret < 0)
+		goto out;
+
+	ret = port->cap->vconn_set(port->cap, ret);
+	if (ret)
+		goto out;
+
+	ret = size;
+out:
+	mutex_unlock(&port->lock);
+	return ret;
+}
+
+static ssize_t current_vconn_role_show(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%s\n", typec_roles[port->vconn_role]);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RW(current_vconn_role);
+
+static ssize_t supported_accessory_modes_show(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	enum typec_accessory *accessory;
+	ssize_t ret = 0;
+	int i;
+
+	mutex_lock(&port->lock);
+	if (port->cap->accessory)
+		for (accessory = port->cap->accessory, i = 0;
+		     i < port->cap->num_accessory; accessory++, i++)
+			ret += sprintf(buf, "%s\n",
+				       typec_accessory_modes[*accessory]);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RO(supported_accessory_modes);
+
+static ssize_t supports_usb_power_delivery_show(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret;
+
+	mutex_lock(&port->lock);
+	ret = sprintf(buf, "%d\n", port->cap->usb_pd);
+	mutex_unlock(&port->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RO(supports_usb_power_delivery);
+
+static struct attribute *typec_attrs[] = {
+	&dev_attr_current_power_role.attr,
+	&dev_attr_current_vconn_role.attr,
+	&dev_attr_current_data_role.attr,
+	&dev_attr_power_operation_mode.attr,
+	&dev_attr_preferred_role.attr,
+	&dev_attr_supported_accessory_modes.attr,
+	&dev_attr_supported_data_roles.attr,
+	&dev_attr_supported_power_roles.attr,
+	&dev_attr_supports_usb_power_delivery.attr,
+	NULL,
+};
+
+static const struct attribute_group typec_group = {
+	.attrs = typec_attrs,
+};
+
+static const struct attribute_group *typec_groups[] = {
+	&typec_group,
+	NULL,
+};
+
+static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	int ret;
+
+	ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
+	if (ret)
+		dev_err(dev, "failed to add uevent TYPEC_PORT\n");
+
+	return ret;
+}
+
+static void typec_release(struct device *dev)
+{
+	struct typec_port *port = to_typec_port(dev);
+
+	ida_simple_remove(&typec_index_ida, port->id);
+	kfree(port);
+}
+
+static struct device_type typec_port_dev_type = {
+	.name = "typec_port",
+	.groups = typec_groups,
+	.uevent = typec_uevent,
+	.release = typec_release,
+};
+
+struct typec_port *typec_register_port(struct device *dev,
+				       const struct typec_capability *cap)
+{
+	struct typec_port *port;
+	int ret;
+	int id;
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return ERR_PTR(-ENOMEM);
+
+	id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
+	if (id < 0) {
+		kfree(port);
+		return ERR_PTR(id);
+	}
+
+	/* FIXME: a better approach for this */
+	port->prefer_role = -1;
+
+	port->id = id;
+	port->cap = cap;
+	port->dev.type = &typec_port_dev_type;
+	port->dev.class = &typec_class;
+	port->dev.parent = dev;
+	dev_set_name(&port->dev, "usbc%d", id);
+	mutex_init(&port->lock);
+
+	typec_init_roles(port);
+
+	ret = device_register(&port->dev);
+	if (ret)
+		goto reg_err;
+
+	ret = __typec_register_altmodes(&port->dev, cap->alt_modes, true);
+	if (ret)
+		goto alt_err;
+
+	return port;
+alt_err:
+	device_unregister(&port->dev);
+reg_err:
+	ida_simple_remove(&typec_index_ida, id);
+	put_device(&port->dev);
+	kfree(port);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(typec_register_port);
+
+void typec_unregister_port(struct typec_port *port)
+{
+	struct typec_altmode *alt;
+
+	WARN_ON(port->connected);
+
+	if (port->cap->alt_modes)
+		for (alt = port->cap->alt_modes; alt->svid; alt++)
+			device_unregister(&alt->dev);
+	device_unregister(&port->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_port);
+
+static int __init typec_init(void)
+{
+	return class_register(&typec_class);
+}
+subsys_initcall(typec_init);
+
+static void __exit typec_exit(void)
+{
+	class_unregister(&typec_class);
+}
+module_exit(typec_exit);
+
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("USB Type-C Connector Class");
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
new file mode 100644
index 0000000..d89a59c
--- /dev/null
+++ b/include/linux/usb/typec.h
@@ -0,0 +1,255 @@
+
+#ifndef __LINUX_USB_TYPEC_H
+#define __LINUX_USB_TYPEC_H
+
+#include <linux/device.h>
+#include <linux/types.h>
+
+struct typec_port;
+
+enum typec_port_type {
+	TYPEC_PORT_DFP,
+	TYPEC_PORT_UFP,
+	TYPEC_PORT_DRP,
+};
+
+enum typec_partner_type {
+	TYPEC_PARTNER_USB,
+	TYPEC_PARTNER_CHARGER,
+	TYPEC_PARTNER_ALTMODE,
+	TYPEC_PARTNER_ACCESSORY,
+};
+
+enum typec_plug_type {
+	USB_PLUG_NONE,
+	USB_PLUG_TYPE_A,
+	USB_PLUG_TYPE_B,
+	USB_PLUG_TYPE_C,
+	USB_PLUG_CAPTIVE,
+};
+
+enum typec_data_role {
+	TYPEC_DEVICE,
+	TYPEC_HOST,
+};
+
+enum typec_role {
+	TYPEC_SINK,
+	TYPEC_SOURCE,
+};
+
+enum typec_pwr_opmode {
+	TYPEC_PWR_MODE_USB,
+	TYPEC_PWR_MODE_BC1_2,
+	TYPEC_PWR_MODE_1_5A,
+	TYPEC_PWR_MODE_3_0A,
+	TYPEC_PWR_MODE_PD,
+};
+
+enum typec_accessory {
+	TYPEC_ACCESSORY_NONE,
+	TYPEC_ACCESSORY_AUDIO,
+	TYPEC_ACCESSORY_DEBUG,
+	TYPEC_ACCESSORY_DAUDIO,
+};
+
+/*
+ * struct typec_mode - Individual Mode of an Alternate Mode
+ * @vdo: VDO returned by Discover Modes USB PD command
+ * @desc: Mode description
+ * @active: Tells if the mode is currently entered or not
+ * @index: Index of the mode
+ * @group_name: Name for the sysfs folder in form "mode<index>"
+ * @group: The sysfs group (folder) for the mode
+ * @attrs: The attributes for the sysfs group
+ * @vdo_attr: Device attribute to expose the VDO of the mode
+ * @desc_attr: Device attribute to expose the description of the mode
+ * @active_attr: Device attribute to expose active of the mode
+ * @roles: Only for ports. DRP if the mode is awailable in both roles
+ * @roles_attr: Device attribute, only for ports, to expose the supported roles
+ *
+ * Details about a mode of an Alternate Mode which a connector, cable plug or
+ * partner supports. Every mode will have it's own sysfs group. The details are
+ * the VDO returned by discover modes command, description for the mode and
+ * active flag telling is the mode currently active or not.
+ */
+struct typec_mode {
+	u32			vdo;
+	char			*desc;
+	unsigned int		active:1;
+	/* Only for ports */
+	enum typec_port_type	roles;
+
+	struct typec_altmode	*alt_mode;
+
+	int			index;
+	char			group_name[8];
+	struct attribute_group	group;
+	struct attribute	*attrs[5];
+	struct device_attribute vdo_attr;
+	struct device_attribute desc_attr;
+	struct device_attribute active_attr;
+	/* Only for ports */
+	struct device_attribute roles_attr;
+};
+
+/*
+ * struct typec_altmode - USB Type-C Alternate Mode
+ * @dev: struct device instance
+ * @name: Name for the Alternate Mode (optional)
+ * @svid: Standard or Vendor ID
+ * @n_modes: Number of modes
+ * @modes: Array of modes supported by the Alternat Mode
+ * @mode_groups: The modes as attribute groups to be exposed in sysfs
+ *
+ * Representation of an Alternate Mode that has SVID assigned by USB-IF. The
+ * array of modes will list the modes of a particular SVID that are supported by
+ * a connector, partner of a cable plug.
+ */
+struct typec_altmode {
+	struct device		dev;
+	char			*name;
+
+	u16			svid;
+	int			n_modes;
+	struct typec_mode	*modes;
+
+	const struct attribute_group **mode_groups;
+};
+
+#define to_altmode(d) container_of(d, struct typec_altmode, dev)
+
+struct typec_port *typec_altmode2port(struct typec_altmode *);
+
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+				 bool active);
+
+int typec_register_altmodes(struct device *, struct typec_altmode *);
+void typec_unregister_altmodes(struct device *);
+
+/*
+ * struct typec_plug - USB Type-C Cable Plug
+ * @dev: struct device instance
+ * @index: 1 for the plug connected to DFP and 2 for the plug connected to UFP
+ * @alt_modes: Alternate Modes the cable plug supports (null terminated)
+ *
+ * Represents USB Type-C Cable Plug.
+ */
+struct typec_plug {
+	struct device		dev;
+	int			index;
+	struct typec_altmode	*alt_modes;
+};
+
+/*
+ * struct typec_cable - USB Type-C Cable
+ * @dev: struct device instance
+ * @type: The plug type from USB PD Cable VDO
+ * @active: Is the cable active or passive
+ *Â@sop_pp_controller: Tells whether both cable plugs are configurable or not
+ * @plug: The two plugs in the cable.
+ *
+ * Represents USB Type-C Cable attached to USB Type-C port. Two plugs are
+ * created if the cable has SOP Double Prime controller as defined in USB PD
+ * specification. Otherwise only one will be created if the cable is active. For
+ * passive cables no plugs are created.
+ */
+struct typec_cable {
+	struct device		dev;
+	enum typec_plug_type	type;
+	unsigned int		active:1;
+	unsigned int		sop_pp_controller:1;
+	/* REVISIT: What else needed? */
+
+	struct typec_plug	plug[2];
+};
+
+/*
+ * struct typec_partner - USB Type-C Partner
+ * @dev: struct device instance
+ * @type: Normal USB device, charger, Alternate Mode or Accessory
+ * @alt_modes: Alternate Modes the partner supports (null terminated)
+ *
+ * Details about a partner that is attached to USB Type-C port.
+ */
+struct typec_partner {
+	struct device		dev;
+	enum typec_partner_type	type;
+	enum typec_accessory	accessory;
+	struct typec_altmode	*alt_modes;
+};
+
+/*
+ * struct typec_capability - USB Type-C Port Capabilities
+ * @role: DFP (Host-only), UFP (Device-only) or DRP (Dual Role)
+ * @usb_pd: USB Power Delivery support
+ * @accessory: Supported Accessory Modes
+ * @num_accessory: Number of supported Accessory Modes
+ * @alt_modes: Alternate Modes the connector supports (null terminated)
+ * @try_role: Set a fixed data role for DRP port
+ * @dr_set: Set Data Role
+ * @pr_set: Set Power Role
+ * @vconn_set: Set VCONN Role
+ * @activate_mode: Enter/exit given Alternate Mode
+ *
+ * Static capabilities of a single USB Type-C port.
+ */
+struct typec_capability {
+	enum typec_port_type	type;
+	unsigned int		usb_pd:1;
+	enum typec_accessory	*accessory;
+	unsigned int		num_accessory;
+	struct typec_altmode	*alt_modes;
+
+	int			(*try_role)(const struct typec_capability *,
+					    enum typec_role);
+
+	int			(*dr_set)(const struct typec_capability *,
+					  enum typec_data_role);
+	int			(*pr_set)(const struct typec_capability *,
+					  enum typec_role);
+	int			(*vconn_set)(const struct typec_capability *,
+					     enum typec_role);
+
+	int			(*activate_mode)(struct typec_altmode *,
+						 int mode, int activate);
+};
+
+/*
+ * struct typec_connection - Details about USB Type-C port connection event
+ * @partner: The attached partner
+ * @cable: The attached cable
+ * @data_role: Initial USB data role (host or device)
+ * @pwr_role: Initial Power role (source or sink)
+ * @vconn_role: Initial VCONN role (source or sink)
+ * @pwr_opmode: The power mode of the connection
+ *
+ * All the relevant details about a connection event. Wrapper that is passed to
+ * typec_connect(). The context is copied when typec_connect() is called and the
+ * structure is not used for anything else.
+ */
+struct typec_connection {
+	struct typec_partner	*partner;
+	struct typec_cable	*cable;
+
+	enum typec_data_role	data_role;
+	enum typec_role		pwr_role;
+	enum typec_role		vconn_role;
+	enum typec_pwr_opmode	pwr_opmode;
+};
+
+struct typec_port *typec_register_port(struct device *dev,
+				       const struct typec_capability *cap);
+void typec_unregister_port(struct typec_port *port);
+
+int typec_connect(struct typec_port *port, struct typec_connection *con);
+void typec_disconnect(struct typec_port *port);
+
+/* Callbacks from driver */
+
+void typec_set_data_role(struct typec_port *, enum typec_data_role);
+void typec_set_pwr_role(struct typec_port *, enum typec_role);
+void typec_set_vconn_role(struct typec_port *, enum typec_role);
+void typec_set_pwr_opmode(struct typec_port *, enum typec_pwr_opmode);
+
+#endif /* __LINUX_USB_TYPEC_H */
-- 
2.8.1