[PATCH v16 2/3] 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 the port supports
USB Power Delivery, also control over power role swapping
and Alternate Modes.

Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-class-typec |  276 ++++++
 Documentation/usb/typec.rst                 |  185 ++++
 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                   | 1264 +++++++++++++++++++++++++++
 include/linux/usb/typec.h                   |  243 +++++
 9 files changed, 1989 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-typec
 create mode 100644 Documentation/usb/typec.rst
 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 000000000000..a7ac417d2ed3
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -0,0 +1,276 @@
+USB Type-C port devices (eg. /sys/class/typec/port0/)
+
+What:		/sys/class/typec/<port>/data_role
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		The supported USB data roles. This attribute can be used for
+		requesting data role swapping on the port. Swapping is supported
+		as synchronous operation, so write(2) to the attribute will not
+		return until the operation has finished. The attribute is
+		notified about role changes so that poll(2) on the attribute
+		wakes up. Change on the role will also generate uevent
+		KOBJ_CHANGE on the port. The current role is show in brackets,
+		for example "[host] device" when DRP port is in host mode.
+
+		Valid values: host, device
+
+What:		/sys/class/typec/<port>/power_role
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		The supported power roles. This attribute can be used to request
+		power role swap on the port when the port supports USB Power
+		Delivery. Swapping is supported as synchronous operation, so
+		write(2) to the attribute will not return until the operation
+		has finished. The attribute is notified about role changes so
+		that poll(2) on the attribute wakes up. Change on the role will
+		also generate uevent KOBJ_CHANGE. The current role is show in
+		brackets, for example "[source] sink" when in source mode.
+
+		Valid values: source, sink
+
+What:		/sys/class/typec/<port>/vconn_source
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows is the port VCONN Source. This attribute can be used to
+		request VCONN swap to change the VCONN Source during connection
+		when both the port and the partner support USB Power Delivery.
+		Swapping is supported as synchronous operation, so write(2) to
+		the attribute will not return until the operation has finished.
+		The attribute is notified about VCONN source changes so that
+		poll(2) on the attribute wakes up. Change on VCONN source also
+		generates uevent KOBJ_CHANGE.
+
+		Valid values:
+		- "no" when the port is not the VCONN Source
+		- "yes" when the port is the VCONN Source
+
+What:		/sys/class/typec/<port>/power_operation_mode
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the current power operational mode the port is in. The
+		power operation mode means current level for VBUS. In case USB
+		Power Delivery communication is used for negotiating the levels,
+		power operation mode should show "usb_power_delivery".
+
+		Valid values:
+		- default
+		- 1.5A
+		- 3.0A
+		- usb_power_delivery
+
+What:		/sys/class/typec/<port>/preferred_role
+Date:		February 2017
+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. By
+		default the preferred role should come from the platform.
+
+		Valid values: source, sink, none (to remove preference)
+
+What:		/sys/class/typec/<port>/supported_accessory_modes
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Space separated list of accessory modes, defined in the USB
+		Type-C specification, the port supports.
+
+What:		/sys/class/typec/<port>/usb_power_delivery_revision
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Revision number of the supported USB Power Delivery
+		specification, or 0 when USB Power Delivery is not supported.
+
+What:		/sys/class/typec/<port>/usb_typec_revision
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Revision number of the supported USB Type-C specification.
+
+
+USB Type-C partner devices (eg. /sys/class/typec/port0-partner/)
+
+What:		/sys/class/typec/<port>-partner/accessory_mode
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the Accessory Mode name when the partner is an Accessory.
+		The Accessory Modes are defined in USB Type-C Specification.
+
+What:		/sys/class/typec/<port>-partner/supports_usb_power_delivery
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows if the partner supports USB Power Delivery communication:
+		Valid values: yes, no
+
+What:		/sys/class/typec/<port>-partner>/identity/
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		This directory appears only if the port device driver is capable
+		of showing the result of Discover Identity USB power delivery
+		command. That will not always be possible even when USB power
+		delivery is supported, for example when USB power delivery
+		communication for the port is mostly handled in firmware. If the
+		directory exists, it will have an attribute file for every VDO
+		in Discover Identity command result.
+
+What:		/sys/class/typec/<port>-partner/identity/id_header
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		ID Header VDO part of Discover Identity command result. The
+		value will show 0 until Discover Identity command result becomes
+		available. The value can be polled.
+
+What:		/sys/class/typec/<port>-partner/identity/cert_stat
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Cert Stat VDO part of Discover Identity command result. The
+		value will show 0 until Discover Identity command result becomes
+		available. The value can be polled.
+
+What:		/sys/class/typec/<port>-partner/identity/product
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Product VDO part of Discover Identity command result. The value
+		will show 0 until Discover Identity command result becomes
+		available. The value can be polled.
+
+
+USB Type-C cable devices (eg. /sys/class/typec/port0-cable/)
+
+Note: Electronically Marked Cables will have a device also for one cable plug
+(eg. /sys/class/typec/port0-plug0). If the cable is active and has also SOP
+Double Prime controller (USB Power Deliver specification ch. 2.4) it will have
+second device also for the other plug. Both plugs may have alternate modes as
+described in USB Type-C and USB Power Delivery specifications.
+
+What:		/sys/class/typec/<port>-cable/type
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows if the cable is active.
+		Valid values: active, passive
+
+What:		/sys/class/typec/<port>-cable/plug_type
+Date:		February 2017
+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
+		- captive
+
+What:		/sys/class/typec/<port>-cable/identity/
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		This directory appears only if the port device driver is capable
+		of showing the result of Discover Identity USB power delivery
+		command. That will not always be possible even when USB power
+		delivery is supported. If the directory exists, it will have an
+		attribute for every VDO returned by Discover Identity command.
+
+What:		/sys/class/typec/<port>-cable/identity/id_header
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		ID Header VDO part of Discover Identity command result. The
+		value will show 0 until Discover Identity command result becomes
+		available. The value can be polled.
+
+What:		/sys/class/typec/<port>-cable/identity/cert_stat
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Cert Stat VDO part of Discover Identity command result. The
+		value will show 0 until Discover Identity command result becomes
+		available. The value can be polled.
+
+What:		/sys/class/typec/<port>-cable/identity/product
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Product VDO part of Discover Identity command result. The value
+		will show 0 until Discover Identity command result becomes
+		available. The value can be polled.
+
+
+Alternate Mode devices.
+
+The alternate modes will have Standard or Vendor ID (SVID) assigned by USB-IF.
+The ports, partners and cable plugs can have alternate modes. A supported SVID
+will consist of a set of modes. Every SVID a port/partner/plug supports will
+have a device created for it, and every supported mode for a supported SVID will
+have its own directory under that device. Below <dev> refers to the device for
+the alternate mode.
+
+What:		/sys/class/typec/<port|partner|cable>/<dev>/svid
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		The SVID (Standard or Vendor ID) assigned by USB-IF for this
+		alternate mode.
+
+What:		/sys/class/typec/<port|partner|cable>/<dev>/mode<index>/
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Every supported mode will have its own directory. The name of
+		a mode will be "mode<index>" (for example mode1), where <index>
+		is the actual index to the mode VDO returned by Discover Modes
+		USB power delivery command.
+
+What:		/sys/class/typec/<port|partner|cable>/<dev>/mode<index>/description
+Date:		February 2017
+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/<port|partner|cable>/<dev>/mode<index>/vdo
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Shows the VDO in hexadecimal returned by Discover Modes command
+		for this mode.
+
+What:		/sys/class/typec/<port|partner|cable>/<dev>/mode<index>/active
+Date:		February 2017
+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. Entering/exiting modes is
+		supported as synchronous operation so write(2) to the attribute
+		does not return until the enter/exit mode operation has
+		finished. The attribute is notified when the mode is
+		entered/exited so poll(2) on the attribute wakes up.
+		Entering/exiting a mode will also generate uevent KOBJ_CHANGE.
+
+		Valid values: yes, no
+
+What:		/sys/class/typec/<port>/<dev>/mode<index>/supported_roles
+Date:		February 2017
+Contact:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
+Description:
+		Space separated list of the supported roles.
+
+		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.
+
+		Valid values: source, sink
diff --git a/Documentation/usb/typec.rst b/Documentation/usb/typec.rst
new file mode 100644
index 000000000000..e9b4ad4c3baa
--- /dev/null
+++ b/Documentation/usb/typec.rst
@@ -0,0 +1,185 @@
+
+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
+except 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 offer user space control over
+the roles and alternate modes of ports, partners and cable plugs 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.
+
+User space interface
+--------------------
+Every port will be presented as its own device under /sys/class/typec/. The
+first port will be named "port0", the second "port1" 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 it
+is attached to. The partner attached to port "port0" will be named
+"port0-partner". Full path to the device would be
+/sys/class/typec/port0/port0-partner/.
+
+The cable and the two plugs on it may also be optionally presented as their own
+devices under /sys/class/typec/. The cable attached to the port "port0" port
+will be named port0-cable and the plug on the SOP Prime end (see USB Power
+Delivery Specification ch. 2.4) will be named "port0-plug0" and on the SOP
+Double Prime end "port0-plug1". The parent of a cable will always be the port,
+and the parent of the cable plugs will always be the cable.
+
+If the port, partner or cable plug support Alternate Modes, every supported
+Alternate Mode SVID will have their own device describing them. The Alternate
+Modes will not be attached to the typec class. The parent of an alternate mode
+will be the device that supports it, so for example an alternate mode of
+port0-partner will bees presented under /sys/class/typec/port0-partner/. Every
+mode that is supported will have its own group under the Alternate Mode device
+named "mode<index>", for example /sys/class/typec/port0/<alternate mode>/mode1/.
+The requests for entering/exiting a mode can be done with "active" attribute
+file in that group.
+
+Driver 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:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_register_port typec_unregister_port
+
+When registering the ports, the prefer_role member in struct typec_capability
+deserves special notice. If the port that is being registered does not have
+initial role preference, which means the port does not execute Try.SNK or
+Try.SRC by default, the member must have value TYPEC_NO_PREFERRED_ROLE.
+Otherwise if the port executes Try.SNK by default the member must have value
+TYPEC_DEVICE and with Try.SRC the value must be TYPEC_HOST.
+
+Registering Partners
+~~~~~~~~~~~~~~~~~~~~
+
+After successful connection of a partner, the port driver needs to register the
+partner with the class. Details about the partner need to be described in struct
+typec_partner_desc. The class copies the details of the partner during
+registration. The class offers the following API for registering/unregistering
+partners.
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_register_partner typec_unregister_partner
+
+The class will provide a handle to struct typec_partner if the registration was
+successful, or NULL.
+
+If the partner is USB Power Delivery capable, and the port driver is able to
+show the result of Discover Identity command, the partner descriptor structure
+should include handle to struct usb_pd_identity instance. The class will then
+create a sysfs directory for the identity under the partner device. The result
+of Discover Identity command can then be reported with the following API:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_partner_set_identity
+
+Registering Cables
+~~~~~~~~~~~~~~~~~~
+
+After successful connection of a cable that supports USB Power Delivery
+Structured VDM "Discover Identity", the port driver needs to register the cable
+and one or two plugs, depending if there is CC Double Prime controller present
+in the cable or not. So a cable capable of SOP Prime communication, but not SOP
+Double Prime communication, should only have one plug registered. For more
+information about SOP communication, please read chapter about it from the
+latest USB Power Delivery specification.
+
+The plugs are represented as their own devices. The cable is registered first,
+followed by registration of the cable plugs. The cable will be the parent device
+for the plugs. Details about the cable need to be described in struct
+typec_cable_desc and about a plug in struct typec_plug_desc. The class copies
+the details during registration. The class offers the following API for
+registering/unregistering cables and their plugs:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_register_cable typec_unregister_cable typec_register_plug
+   typec_unregister_plug
+
+The class will provide a handle to struct typec_cable and struct typec_plug if
+the registration is successful, or NULL if it isn't.
+
+If the cable is USB Power Delivery capable, and the port driver is able to show
+the result of Discover Identity command, the cable descriptor structure should
+include handle to struct usb_pd_identity instance. The class will then create a
+sysfs directory for the identity under the cable device. The result of Discover
+Identity command can then be reported with the following API:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_cable_set_identity
+
+Notifications
+~~~~~~~~~~~~~
+
+When the partner has executed a role change, or when the default roles change
+during connection of a partner or cable, the port driver must use the following
+APIs to report it to the class:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_set_data_role typec_set_pwr_role typec_set_vconn_role
+   typec_set_pwr_opmode
+
+Alternate Modes
+~~~~~~~~~~~~~~~
+
+USB Type-C Ports, Partners and Cable Plugs may support Alternate Modes with USB
+Type-C. Each Alternate Mode will have SVID, which is either a Standard ID given
+by USB-IF or vendor ID. Each supported SVID can have 1 - 6 modes. The class
+provides struct typec_mode_desc for describing individual mode of a SVID, and
+struct typec_altmode_desc which is a container of all the modes of a SVID that a
+port, partner or cable plug supports.
+
+Ports that support Alternate Modes need to register each SVID they support with
+the following API:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_port_register_altmode
+
+If a partner or cable plug provides a list of SVIDs as response to USB Power
+Delivery Structured VDM Discover SVIDs message, each SVID needs to be
+registered.
+
+API for the partners:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_partner_register_altmode
+
+API for the Cable Plugs:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_plug_register_altmode
+
+So ports, partners and cable plugs will register the alternate modes with their
+own functions, but the registration will always return a handle to struct
+typec_altmode on success, or NULL. The unregistration will happen with the same
+function:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_unregister_altmode
+
+If a partner or cable plug enters or exits a mode, the port driver needs to
+notify the class with the following API:
+
+.. kernel-doc:: drivers/usb/typec/typec.c
+   :functions: typec_altmode_update_active
diff --git a/MAINTAINERS b/MAINTAINERS
index eb5a6fc8d6f9..439801d42fbb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12975,6 +12975,15 @@ 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.rst
+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 fbe493d44e81..89c322e0742b 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -152,6 +152,8 @@ 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 && LEDS_TRIGGERS
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 7791af6c102c..c7f409885eff 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -62,3 +62,5 @@ 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 000000000000..17792f9114c6
--- /dev/null
+++ b/drivers/usb/typec/Kconfig
@@ -0,0 +1,7 @@
+
+menu "USB Power Delivery 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 000000000000..1012a8bed6d5
--- /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 000000000000..3fd36fe8902f
--- /dev/null
+++ b/drivers/usb/typec/typec.c
@@ -0,0 +1,1264 @@
+/*
+ * USB Type-C Connector Class
+ *
+ * Copyright (C) 2017, 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_mode {
+	int				index;
+	u32				vdo;
+	char				*desc;
+	enum typec_port_type		roles;
+
+	struct typec_altmode		*alt_mode;
+
+	unsigned int			active:1;
+
+	char				group_name[6];
+	struct attribute_group		group;
+	struct attribute		*attrs[5];
+	struct device_attribute		vdo_attr;
+	struct device_attribute		desc_attr;
+	struct device_attribute		active_attr;
+	struct device_attribute		roles_attr;
+};
+
+struct typec_altmode {
+	struct device			dev;
+	u16				svid;
+	int				n_modes;
+	struct typec_mode		modes[ALTMODE_MAX_MODES];
+	const struct attribute_group	*mode_groups[ALTMODE_MAX_MODES];
+};
+
+struct typec_plug {
+	struct device			dev;
+	enum typec_plug_index		index;
+};
+
+struct typec_cable {
+	struct device			dev;
+	enum typec_plug_type		type;
+	struct usb_pd_identity		*identity;
+	unsigned int			active:1;
+};
+
+struct typec_partner {
+	struct device			dev;
+	unsigned int			usb_pd:1;
+	struct usb_pd_identity		*identity;
+	enum typec_accessory		accessory;
+};
+
+struct typec_port {
+	unsigned int			id;
+	struct device			dev;
+
+	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;
+
+	const struct typec_capability	*cap;
+};
+
+#define to_typec_port(_dev_) container_of(_dev_, struct typec_port, dev)
+#define to_typec_plug(_dev_) container_of(_dev_, struct typec_plug, dev)
+#define to_typec_cable(_dev_) container_of(_dev_, struct typec_cable, dev)
+#define to_typec_partner(_dev_) container_of(_dev_, struct typec_partner, dev)
+#define to_altmode(_dev_) container_of(_dev_, struct typec_altmode, dev)
+
+static const struct device_type typec_partner_dev_type;
+static const struct device_type typec_cable_dev_type;
+static const struct device_type typec_plug_dev_type;
+static const struct device_type typec_port_dev_type;
+
+#define is_typec_partner(_dev_) (_dev_->type == &typec_partner_dev_type)
+#define is_typec_cable(_dev_) (_dev_->type == &typec_cable_dev_type)
+#define is_typec_plug(_dev_) (_dev_->type == &typec_plug_dev_type)
+#define is_typec_port(_dev_) (_dev_->type == &typec_port_dev_type)
+
+static DEFINE_IDA(typec_index_ida);
+static struct class *typec_class;
+
+/* Common attributes */
+
+static const char * const typec_accessory_modes[] = {
+	[TYPEC_ACCESSORY_NONE]		= "none",
+	[TYPEC_ACCESSORY_AUDIO]		= "analog_audio",
+	[TYPEC_ACCESSORY_DEBUG]		= "debug",
+};
+
+static struct usb_pd_identity *get_pd_identity(struct device *dev)
+{
+	if (is_typec_partner(dev)) {
+		struct typec_partner *partner = to_typec_partner(dev);
+
+		return partner->identity;
+	} else if (is_typec_cable(dev)) {
+		struct typec_cable *cable = to_typec_cable(dev);
+
+		return cable->identity;
+	}
+	return NULL;
+}
+
+static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct usb_pd_identity *id = get_pd_identity(dev);
+
+	return sprintf(buf, "0x%08x\n", id->id_header);
+}
+static DEVICE_ATTR_RO(id_header);
+
+static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct usb_pd_identity *id = get_pd_identity(dev);
+
+	return sprintf(buf, "0x%08x\n", id->cert_stat);
+}
+static DEVICE_ATTR_RO(cert_stat);
+
+static ssize_t product_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct usb_pd_identity *id = get_pd_identity(dev);
+
+	return sprintf(buf, "0x%08x\n", id->product);
+}
+static DEVICE_ATTR_RO(product);
+
+static struct attribute *usb_pd_id_attrs[] = {
+	&dev_attr_id_header.attr,
+	&dev_attr_cert_stat.attr,
+	&dev_attr_product.attr,
+	NULL
+};
+
+static const struct attribute_group usb_pd_id_group = {
+	.name = "identity",
+	.attrs = usb_pd_id_attrs,
+};
+
+static const struct attribute_group *usb_pd_id_groups[] = {
+	&usb_pd_id_group,
+	NULL,
+};
+
+static void typec_report_identity(struct device *dev)
+{
+	sysfs_notify(&dev->kobj, "identity", "id_header");
+	sysfs_notify(&dev->kobj, "identity", "cert_stat");
+	sysfs_notify(&dev->kobj, "identity", "product");
+}
+
+/* ------------------------------------------------------------------------- */
+/* Alternate Modes */
+
+/**
+ * typec_altmode_update_active - Report Enter/Exit mode
+ * @alt: Handle to the alternate mode
+ * @mode: Mode index
+ * @active: True when the mode has been entered
+ *
+ * If a partner or cable plug executes Enter/Exit Mode command successfully, the
+ * drivers use this routine to report the updated state of the mode.
+ */
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+				 bool active)
+{
+	struct typec_mode *m = &alt->modes[mode];
+	char dir[6];
+
+	if (m->active == active)
+		return;
+
+	m->active = active;
+	snprintf(dir, sizeof(dir), "mode%d", mode);
+	sysfs_notify(&alt->dev.kobj, dir, "active");
+	kobject_uevent(&alt->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_altmode_update_active);
+
+/**
+ * typec_altmode2port - Alternate Mode to USB Type-C port
+ * @alt: The Alternate Mode
+ *
+ * Returns handle to the port that a cable plug or partner with @alt is
+ * connected to.
+ */
+struct typec_port *typec_altmode2port(struct typec_altmode *alt)
+{
+	if (is_typec_plug(alt->dev.parent))
+		return to_typec_port(alt->dev.parent->parent->parent);
+	if (is_typec_partner(alt->dev.parent))
+		return to_typec_port(alt->dev.parent->parent);
+	if (is_typec_port(alt->dev.parent))
+		return to_typec_port(alt->dev.parent);
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(typec_altmode2port);
+
+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);
+
+	return sprintf(buf, "0x%08x\n", mode->vdo);
+}
+
+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);
+
+	return sprintf(buf, "%s\n", mode->desc ? mode->desc : "");
+}
+
+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);
+
+	return sprintf(buf, "%s\n", mode->active ? "yes" : "no");
+}
+
+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;
+
+	if (!port->cap->activate_mode)
+		return -EOPNOTSUPP;
+
+	ret = kstrtobool(buf, &activate);
+	if (ret)
+		return ret;
+
+	ret = port->cap->activate_mode(port->cap, mode->index, activate);
+	if (ret)
+		return ret;
+
+	return size;
+}
+
+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);
+	ssize_t ret;
+
+	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;
+	}
+	return ret;
+}
+
+static void typec_init_modes(struct typec_altmode *alt,
+			     struct typec_mode_desc *desc, bool is_port)
+{
+	int i;
+
+	for (i = 0; i < alt->n_modes; i++, desc++) {
+		struct typec_mode *mode = &alt->modes[i];
+
+		/* Not considering the human readable description critical */
+		mode->desc = kstrdup(desc->desc, GFP_KERNEL);
+		if (desc->desc && !mode->desc)
+			dev_err(&alt->dev, "failed to copy mode%d desc\n", i);
+
+		mode->alt_mode = alt;
+		mode->vdo = desc->vdo;
+		mode->roles = desc->roles;
+		mode->index = desc->index;
+		sprintf(mode->group_name, "mode%d", desc->index);
+
+		sysfs_attr_init(&mode->vdo_attr.attr);
+		mode->vdo_attr.attr.name = "vdo";
+		mode->vdo_attr.attr.mode = 0444;
+		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 = 0444;
+		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 = 0644;
+		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 = 0444;
+			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 ssize_t svid_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct typec_altmode *alt = to_altmode(dev);
+
+	return sprintf(buf, "%04x\n", alt->svid);
+}
+static DEVICE_ATTR_RO(svid);
+
+static struct attribute *typec_altmode_attrs[] = {
+	&dev_attr_svid.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(typec_altmode);
+
+static void typec_altmode_release(struct device *dev)
+{
+	struct typec_altmode *alt = to_altmode(dev);
+	int i;
+
+	for (i = 0; i < alt->n_modes; i++)
+		kfree(alt->modes[i].desc);
+	kfree(alt);
+}
+
+static const struct device_type typec_altmode_dev_type = {
+	.name = "typec_alternate_mode",
+	.groups = typec_altmode_groups,
+	.release = typec_altmode_release,
+};
+
+static struct typec_altmode *
+typec_register_altmode(struct device *parent, struct typec_altmode_desc *desc)
+{
+	struct typec_altmode *alt;
+	int ret;
+
+	alt = kzalloc(sizeof(*alt), GFP_KERNEL);
+	if (!alt)
+		return NULL;
+
+	alt->svid = desc->svid;
+	alt->n_modes = desc->n_modes;
+	typec_init_modes(alt, desc->modes, is_typec_port(parent));
+
+	alt->dev.parent = parent;
+	alt->dev.groups = alt->mode_groups;
+	alt->dev.type = &typec_altmode_dev_type;
+	dev_set_name(&alt->dev, "svid-%04x", alt->svid);
+
+	ret = device_register(&alt->dev);
+	if (ret) {
+		dev_err(parent, "failed to register alternate mode (%d)\n",
+			ret);
+		put_device(&alt->dev);
+		return NULL;
+	}
+
+	return alt;
+}
+
+/**
+ * typec_unregister_altmode - Unregister Alternate Mode
+ * @alt: The alternate mode to be unregistered
+ *
+ * Unregister device created with typec_partner_register_altmode(),
+ * typec_plug_register_altmode() or typec_port_register_altmode().
+ */
+void typec_unregister_altmode(struct typec_altmode *alt)
+{
+	if (alt)
+		device_unregister(&alt->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_altmode);
+
+/* ------------------------------------------------------------------------- */
+/* Type-C Partners */
+
+static ssize_t accessory_mode_show(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct typec_partner *p = to_typec_partner(dev);
+
+	return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
+}
+static DEVICE_ATTR_RO(accessory_mode);
+
+static ssize_t supports_usb_power_delivery_show(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct typec_partner *p = to_typec_partner(dev);
+
+	return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
+}
+static DEVICE_ATTR_RO(supports_usb_power_delivery);
+
+static struct attribute *typec_partner_attrs[] = {
+	&dev_attr_accessory_mode.attr,
+	&dev_attr_supports_usb_power_delivery.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(typec_partner);
+
+static void typec_partner_release(struct device *dev)
+{
+	struct typec_partner *partner = to_typec_partner(dev);
+
+	kfree(partner);
+}
+
+static const struct device_type typec_partner_dev_type = {
+	.name = "typec_partner",
+	.groups = typec_partner_groups,
+	.release = typec_partner_release,
+};
+
+/**
+ * typec_partner_set_identity - Report result from Discover Identity command
+ * @partner: The partner updated identity values
+ *
+ * This routine is used to report that the result of Discover Identity USB power
+ * delivery command has become available.
+ */
+int typec_partner_set_identity(struct typec_partner *partner)
+{
+	if (!partner->identity)
+		return -EINVAL;
+
+	typec_report_identity(&partner->dev);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(typec_partner_set_identity);
+
+/**
+ * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
+ * @partner: USB Type-C Partner that supports the alternate mode
+ * @desc: Description of the alternate mode
+ *
+ * This routine is used to register each alternate mode individually that
+ * @partner has listed in response to Discover SVIDs command. The modes for a
+ * SVID listed in response to Discover Modes command need to be listed in an
+ * array in @desc.
+ *
+ * Returns handle to the alternate mode on success or NULL on failure.
+ */
+struct typec_altmode *
+typec_partner_register_altmode(struct typec_partner *partner,
+			       struct typec_altmode_desc *desc)
+{
+	return typec_register_altmode(&partner->dev, desc);
+}
+EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
+
+/**
+ * typec_register_partner - Register a USB Type-C Partner
+ * @port: The USB Type-C Port the partner is connected to
+ * @desc: Description of the partner
+ *
+ * Registers a device for USB Type-C Partner described in @desc.
+ *
+ * Returns handle to the partner on success or NULL on failure.
+ */
+struct typec_partner *typec_register_partner(struct typec_port *port,
+					     struct typec_partner_desc *desc)
+{
+	struct typec_partner *partner;
+	int ret;
+
+	partner = kzalloc(sizeof(*partner), GFP_KERNEL);
+	if (!partner)
+		return NULL;
+
+	partner->usb_pd = desc->usb_pd;
+	partner->accessory = desc->accessory;
+
+	if (desc->identity) {
+		/*
+		 * Creating directory for the identity only if the driver is
+		 * able to provide data to it.
+		 */
+		partner->dev.groups = usb_pd_id_groups;
+		partner->identity = desc->identity;
+	}
+
+	partner->dev.class = typec_class;
+	partner->dev.parent = &port->dev;
+	partner->dev.type = &typec_partner_dev_type;
+	dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
+
+	ret = device_register(&partner->dev);
+	if (ret) {
+		dev_err(&port->dev, "failed to register partner (%d)\n", ret);
+		put_device(&partner->dev);
+		return NULL;
+	}
+
+	return partner;
+}
+EXPORT_SYMBOL_GPL(typec_register_partner);
+
+/**
+ * typec_unregister_partner - Unregister a USB Type-C Partner
+ * @partner: The partner to be unregistered
+ *
+ * Unregister device created with typec_register_partner().
+ */
+void typec_unregister_partner(struct typec_partner *partner)
+{
+	if (partner)
+		device_unregister(&partner->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_partner);
+
+/* ------------------------------------------------------------------------- */
+/* Type-C Cable Plugs */
+
+static void typec_plug_release(struct device *dev)
+{
+	struct typec_plug *plug = to_typec_plug(dev);
+
+	kfree(plug);
+}
+
+static const struct device_type typec_plug_dev_type = {
+	.name = "typec_plug",
+	.release = typec_plug_release,
+};
+
+/**
+ * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
+ * @plug: USB Type-C Cable Plug that supports the alternate mode
+ * @desc: Description of the alternate mode
+ *
+ * This routine is used to register each alternate mode individually that @plug
+ * has listed in response to Discover SVIDs command. The modes for a SVID that
+ * the plug lists in response to Discover Modes command need to be listed in an
+ * array in @desc.
+ *
+ * Returns handle to the alternate mode on success or NULL on failure.
+ */
+struct typec_altmode *
+typec_plug_register_altmode(struct typec_plug *plug,
+			    struct typec_altmode_desc *desc)
+{
+	return typec_register_altmode(&plug->dev, desc);
+}
+EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
+
+/**
+ * typec_register_plug - Register a USB Type-C Cable Plug
+ * @cable: USB Type-C Cable with the plug
+ * @desc: Description of the cable plug
+ *
+ * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
+ * Cable Plug represents a plug with electronics in it that can response to USB
+ * Power Delivery SOP Prime or SOP Double Prime packages.
+ *
+ * Returns handle to the cable plug on success or NULL on failure.
+ */
+struct typec_plug *typec_register_plug(struct typec_cable *cable,
+				       struct typec_plug_desc *desc)
+{
+	struct typec_plug *plug;
+	char name[8];
+	int ret;
+
+	plug = kzalloc(sizeof(*plug), GFP_KERNEL);
+	if (!plug)
+		return NULL;
+
+	sprintf(name, "plug%d", desc->index);
+
+	plug->index = desc->index;
+	plug->dev.class = typec_class;
+	plug->dev.parent = &cable->dev;
+	plug->dev.type = &typec_plug_dev_type;
+	dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
+
+	ret = device_register(&plug->dev);
+	if (ret) {
+		dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
+		put_device(&plug->dev);
+		return NULL;
+	}
+
+	return plug;
+}
+EXPORT_SYMBOL_GPL(typec_register_plug);
+
+/**
+ * typec_unregister_plug - Unregister a USB Type-C Cable Plug
+ * @plug: The cable plug to be unregistered
+ *
+ * Unregister device created with typec_register_plug().
+ */
+void typec_unregister_plug(struct typec_plug *plug)
+{
+	if (plug)
+		device_unregister(&plug->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_plug);
+
+/* Type-C Cables */
+
+static ssize_t
+type_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct typec_cable *cable = to_typec_cable(dev);
+
+	return sprintf(buf, "%s\n", cable->active ? "active" : "passive");
+}
+static DEVICE_ATTR_RO(type);
+
+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 plug_type_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct typec_cable *cable = to_typec_cable(dev);
+
+	return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
+}
+static DEVICE_ATTR_RO(plug_type);
+
+static struct attribute *typec_cable_attrs[] = {
+	&dev_attr_type.attr,
+	&dev_attr_plug_type.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(typec_cable);
+
+static void typec_cable_release(struct device *dev)
+{
+	struct typec_cable *cable = to_typec_cable(dev);
+
+	kfree(cable);
+}
+
+static const struct device_type typec_cable_dev_type = {
+	.name = "typec_cable",
+	.groups = typec_cable_groups,
+	.release = typec_cable_release,
+};
+
+/**
+ * typec_cable_set_identity - Report result from Discover Identity command
+ * @cable: The cable updated identity values
+ *
+ * This routine is used to report that the result of Discover Identity USB power
+ * delivery command has become available.
+ */
+int typec_cable_set_identity(struct typec_cable *cable)
+{
+	if (!cable->identity)
+		return -EINVAL;
+
+	typec_report_identity(&cable->dev);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(typec_cable_set_identity);
+
+/**
+ * typec_register_cable - Register a USB Type-C Cable
+ * @port: The USB Type-C Port the cable is connected to
+ * @desc: Description of the cable
+ *
+ * Registers a device for USB Type-C Cable described in @desc. The cable will be
+ * parent for the optional cable plug devises.
+ *
+ * Returns handle to the cable on success or NULL on failure.
+ */
+struct typec_cable *typec_register_cable(struct typec_port *port,
+					 struct typec_cable_desc *desc)
+{
+	struct typec_cable *cable;
+	int ret;
+
+	cable = kzalloc(sizeof(*cable), GFP_KERNEL);
+	if (!cable)
+		return NULL;
+
+	cable->type = desc->type;
+	cable->active = desc->active;
+
+	if (desc->identity) {
+		/*
+		 * Creating directory for the identity only if the driver is
+		 * able to provide data to it.
+		 */
+		cable->dev.groups = usb_pd_id_groups;
+		cable->identity = desc->identity;
+	}
+
+	cable->dev.class = typec_class;
+	cable->dev.parent = &port->dev;
+	cable->dev.type = &typec_cable_dev_type;
+	dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
+
+	ret = device_register(&cable->dev);
+	if (ret) {
+		dev_err(&port->dev, "failed to register cable (%d)\n", ret);
+		put_device(&cable->dev);
+		return NULL;
+	}
+
+	return cable;
+}
+EXPORT_SYMBOL_GPL(typec_register_cable);
+
+/**
+ * typec_unregister_cable - Unregister a USB Type-C Cable
+ * @cable: The cable to be unregistered
+ *
+ * Unregister device created with typec_register_cable().
+ */
+void typec_unregister_cable(struct typec_cable *cable)
+{
+	if (cable)
+		device_unregister(&cable->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_cable);
+
+/* ------------------------------------------------------------------------- */
+/* USB Type-C ports */
+
+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);
+	int role;
+	int ret;
+
+	if (port->cap->type != TYPEC_PORT_DRP) {
+		dev_dbg(dev, "Preferred role only supported with DRP ports\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (!port->cap->try_role) {
+		dev_dbg(dev, "Setting preferred role not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	role = sysfs_match_string(typec_roles, buf);
+	if (role < 0) {
+		if (sysfs_streq(buf, "none"))
+			role = TYPEC_NO_PREFERRED_ROLE;
+		else
+			return -EINVAL;
+	}
+
+	ret = port->cap->try_role(port->cap, role);
+	if (ret)
+		return ret;
+
+	port->prefer_role = role;
+	return size;
+}
+
+static ssize_t
+preferred_role_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+
+	if (port->cap->type != TYPEC_PORT_DRP)
+		return 0;
+
+	if (port->prefer_role < 0)
+		return 0;
+
+	return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
+}
+static DEVICE_ATTR_RW(preferred_role);
+
+static ssize_t 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;
+
+	if (port->cap->type != TYPEC_PORT_DRP) {
+		dev_dbg(dev, "data role swap only supported with DRP ports\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (!port->cap->dr_set) {
+		dev_dbg(dev, "data role swapping not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	ret = sysfs_match_string(typec_data_roles, buf);
+	if (ret < 0)
+		return ret;
+
+	ret = port->cap->dr_set(port->cap, ret);
+	if (ret)
+		return ret;
+
+	return size;
+}
+
+static ssize_t data_role_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+
+	if (port->cap->type == TYPEC_PORT_DRP)
+		return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
+			       "[host] device" : "host [device]");
+
+	return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
+}
+static DEVICE_ATTR_RW(data_role);
+
+static ssize_t 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;
+
+	if (!port->cap->pd_revision) {
+		dev_dbg(dev, "USB Power Delivery not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (!port->cap->pr_set) {
+		dev_dbg(dev, "power role swapping not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
+		dev_dbg(dev, "partner unable to swap power role\n");
+		return -EIO;
+	}
+
+	ret = sysfs_match_string(typec_roles, buf);
+	if (ret < 0)
+		return ret;
+
+	ret = port->cap->pr_set(port->cap, ret);
+	if (ret)
+		return ret;
+
+	return size;
+}
+
+static ssize_t power_role_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+
+	if (port->cap->type == TYPEC_PORT_DRP)
+		return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
+			       "[source] sink" : "source [sink]");
+
+	return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
+}
+static DEVICE_ATTR_RW(power_role);
+
+static const char * const typec_pwr_opmodes[] = {
+	[TYPEC_PWR_MODE_USB]	= "default",
+	[TYPEC_PWR_MODE_1_5A]	= "1.5A",
+	[TYPEC_PWR_MODE_3_0A]	= "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);
+
+	return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
+}
+static DEVICE_ATTR_RO(power_operation_mode);
+
+static ssize_t vconn_source_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t size)
+{
+	struct typec_port *port = to_typec_port(dev);
+	bool source;
+	int ret;
+
+	if (!port->cap->pd_revision) {
+		dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (!port->cap->vconn_set) {
+		dev_dbg(dev, "VCONN swapping not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	ret = kstrtobool(buf, &source);
+	if (ret)
+		return ret;
+
+	ret = port->cap->vconn_set(port->cap, (enum typec_role)source);
+	if (ret)
+		return ret;
+
+	return size;
+}
+
+static ssize_t vconn_source_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+
+	return sprintf(buf, "%s\n",
+		       port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
+}
+static DEVICE_ATTR_RW(vconn_source);
+
+static ssize_t supported_accessory_modes_show(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	ssize_t ret = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
+		if (port->cap->accessory[i])
+			ret += sprintf(buf + ret, "%s ",
+			       typec_accessory_modes[port->cap->accessory[i]]);
+	}
+
+	if (!ret)
+		return sprintf(buf, "none\n");
+
+	buf[ret - 1] = '\n';
+
+	return ret;
+}
+static DEVICE_ATTR_RO(supported_accessory_modes);
+
+static ssize_t usb_typec_revision_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	struct typec_port *port = to_typec_port(dev);
+	u16 rev = port->cap->revision;
+
+	return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
+}
+static DEVICE_ATTR_RO(usb_typec_revision);
+
+static ssize_t usb_power_delivery_revision_show(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct typec_port *p = to_typec_port(dev);
+
+	return sprintf(buf, "%d\n", (p->cap->pd_revision >> 8) & 0xff);
+}
+static DEVICE_ATTR_RO(usb_power_delivery_revision);
+
+static struct attribute *typec_attrs[] = {
+	&dev_attr_data_role.attr,
+	&dev_attr_power_operation_mode.attr,
+	&dev_attr_power_role.attr,
+	&dev_attr_preferred_role.attr,
+	&dev_attr_supported_accessory_modes.attr,
+	&dev_attr_usb_power_delivery_revision.attr,
+	&dev_attr_usb_typec_revision.attr,
+	&dev_attr_vconn_source.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(typec);
+
+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 const struct device_type typec_port_dev_type = {
+	.name = "typec_port",
+	.groups = typec_groups,
+	.uevent = typec_uevent,
+	.release = typec_release,
+};
+
+/* --------------------------------------- */
+/* Driver callbacks to report role updates */
+
+/**
+ * typec_set_data_role - Report data role change
+ * @port: The USB Type-C Port where the role was changed
+ * @role: The new data role
+ *
+ * This routine is used by the port drivers to report data role changes.
+ */
+void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
+{
+	if (port->data_role == role)
+		return;
+
+	port->data_role = role;
+	sysfs_notify(&port->dev.kobj, NULL, "data_role");
+	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_set_data_role);
+
+/**
+ * typec_set_pwr_role - Report power role change
+ * @port: The USB Type-C Port where the role was changed
+ * @role: The new data role
+ *
+ * This routine is used by the port drivers to report power role changes.
+ */
+void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
+{
+	if (port->pwr_role == role)
+		return;
+
+	port->pwr_role = role;
+	sysfs_notify(&port->dev.kobj, NULL, "power_role");
+	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_set_pwr_role);
+
+/**
+ * typec_set_pwr_role - Report VCONN source change
+ * @port: The USB Type-C Port which VCONN role changed
+ * @role: Source when @port is sourcing VCONN, or Sink when it's not
+ *
+ * This routine is used by the port drivers to report if the VCONN source is
+ * changes.
+ */
+void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
+{
+	if (port->vconn_role == role)
+		return;
+
+	port->vconn_role = role;
+	sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
+	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_set_vconn_role);
+
+/**
+ * typec_set_pwr_opmode - Report changed power operation mode
+ * @port: The USB Type-C Port where the mode was changed
+ * @opmode: New power operation mode
+ *
+ * This routine is used by the port drivers to report changed power operation
+ * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
+ * Type-C specification, and "USB Power Delivery" when the power levels are
+ * negotiated with methods defined in USB Power Delivery specification.
+ */
+void typec_set_pwr_opmode(struct typec_port *port,
+			  enum typec_pwr_opmode opmode)
+{
+	if (port->pwr_opmode == opmode)
+		return;
+
+	port->pwr_opmode = opmode;
+	sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
+	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
+
+/* --------------------------------------- */
+
+/**
+ * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
+ * @port: USB Type-C Port that supports the alternate mode
+ * @desc: Description of the alternate mode
+ *
+ * This routine is used to register an alternate mode that @port is capable of
+ * supporting.
+ *
+ * Returns handle to the alternate mode on success or NULL on failure.
+ */
+struct typec_altmode *
+typec_port_register_altmode(struct typec_port *port,
+			    struct typec_altmode_desc *desc)
+{
+	return typec_register_altmode(&port->dev, desc);
+}
+EXPORT_SYMBOL_GPL(typec_port_register_altmode);
+
+/**
+ * typec_register_port - Register a USB Type-C Port
+ * @parent: Parent device
+ * @cap: Description of the port
+ *
+ * Registers a device for USB Type-C Port described in @cap.
+ *
+ * Returns handle to the port on success or NULL on failure.
+ */
+struct typec_port *typec_register_port(struct device *parent,
+				       const struct typec_capability *cap)
+{
+	struct typec_port *port;
+	int role;
+	int ret;
+	int id;
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return NULL;
+
+	id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
+	if (id < 0) {
+		kfree(port);
+		return NULL;
+	}
+
+	if (cap->type == TYPEC_PORT_DFP)
+		role = TYPEC_SOURCE;
+	else if (cap->type == TYPEC_PORT_UFP)
+		role = TYPEC_SINK;
+	else
+		role = cap->prefer_role;
+
+	if (role == TYPEC_SOURCE) {
+		port->data_role = TYPEC_HOST;
+		port->pwr_role = TYPEC_SOURCE;
+		port->vconn_role = TYPEC_SOURCE;
+	} else {
+		port->data_role = TYPEC_DEVICE;
+		port->pwr_role = TYPEC_SINK;
+		port->vconn_role = TYPEC_SINK;
+	}
+
+	port->id = id;
+	port->cap = cap;
+	port->prefer_role = cap->prefer_role;
+
+	port->dev.class = typec_class;
+	port->dev.parent = parent;
+	port->dev.fwnode = cap->fwnode;
+	port->dev.type = &typec_port_dev_type;
+	dev_set_name(&port->dev, "port%d", id);
+
+	ret = device_register(&port->dev);
+	if (ret) {
+		dev_err(parent, "failed to register port (%d)\n", ret);
+		put_device(&port->dev);
+		return NULL;
+	}
+
+	return port;
+}
+EXPORT_SYMBOL_GPL(typec_register_port);
+
+/**
+ * typec_unregister_port - Unregister a USB Type-C Port
+ * @port: The port to be unregistered
+ *
+ * Unregister device created with typec_register_port().
+ */
+void typec_unregister_port(struct typec_port *port)
+{
+	if (port)
+		device_unregister(&port->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_port);
+
+static int __init typec_init(void)
+{
+	typec_class = class_create(THIS_MODULE, "typec");
+	if (IS_ERR(typec_class))
+		return PTR_ERR(typec_class);
+	return 0;
+}
+subsys_initcall(typec_init);
+
+static void __exit typec_exit(void)
+{
+	class_destroy(typec_class);
+	ida_destroy(&typec_index_ida);
+}
+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 000000000000..ec78204964ab
--- /dev/null
+++ b/include/linux/usb/typec.h
@@ -0,0 +1,243 @@
+
+#ifndef __LINUX_USB_TYPEC_H
+#define __LINUX_USB_TYPEC_H
+
+#include <linux/types.h>
+
+/* XXX: Once we have a header for USB Power Delivery, this belongs there */
+#define ALTMODE_MAX_MODES	6
+
+/* USB Type-C Specification releases */
+#define USB_TYPEC_REV_1_0	0x100 /* 1.0 */
+#define USB_TYPEC_REV_1_1	0x110 /* 1.1 */
+#define USB_TYPEC_REV_1_2	0x120 /* 1.2 */
+
+struct typec_altmode;
+struct typec_partner;
+struct typec_cable;
+struct typec_plug;
+struct typec_port;
+
+struct fwnode_handle;
+
+enum typec_port_type {
+	TYPEC_PORT_DFP,
+	TYPEC_PORT_UFP,
+	TYPEC_PORT_DRP,
+};
+
+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_1_5A,
+	TYPEC_PWR_MODE_3_0A,
+	TYPEC_PWR_MODE_PD,
+};
+
+enum typec_accessory {
+	TYPEC_ACCESSORY_NONE,
+	TYPEC_ACCESSORY_AUDIO,
+	TYPEC_ACCESSORY_DEBUG,
+};
+
+#define TYPEC_MAX_ACCESSORY	3
+
+/*
+ * struct usb_pd_identity - USB Power Delivery identity data
+ * @id_header: ID Header VDO
+ * @cert_stat: Cert Stat VDO
+ * @product: Product VDO
+ *
+ * USB power delivery Discover Identity command response data.
+ *
+ * REVISIT: This is USB Power Delivery specific information, so this structure
+ * probable belongs to USB Power Delivery header file once we have them.
+ */
+struct usb_pd_identity {
+	u32			id_header;
+	u32			cert_stat;
+	u32			product;
+};
+
+int typec_partner_set_identity(struct typec_partner *partner);
+int typec_cable_set_identity(struct typec_cable *cable);
+
+/*
+ * struct typec_mode_desc - Individual Mode of an Alternate Mode
+ * @index: Index of the Mode within the SVID
+ * @vdo: VDO returned by Discover Modes USB PD command
+ * @desc: Optional human readable description of the mode
+ * @roles: Only for ports. DRP if the mode is available in both roles
+ *
+ * Description of 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 has the mode being entered or not.
+ */
+struct typec_mode_desc {
+	int			index;
+	u32			vdo;
+	char			*desc;
+	/* Only used with ports */
+	enum typec_port_type	roles;
+};
+
+/*
+ * struct typec_altmode_desc - USB Type-C Alternate Mode Descriptor
+ * @svid: Standard or Vendor ID
+ * @n_modes: Number of modes
+ * @modes: Array of modes supported by the Alternate Mode
+ *
+ * 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_desc {
+	u16			svid;
+	int			n_modes;
+	struct typec_mode_desc	modes[ALTMODE_MAX_MODES];
+};
+
+struct typec_altmode
+*typec_partner_register_altmode(struct typec_partner *partner,
+				struct typec_altmode_desc *desc);
+struct typec_altmode
+*typec_plug_register_altmode(struct typec_plug *plug,
+			     struct typec_altmode_desc *desc);
+struct typec_altmode
+*typec_port_register_altmode(struct typec_port *port,
+			     struct typec_altmode_desc *desc);
+void typec_unregister_altmode(struct typec_altmode *altmode);
+
+struct typec_port *typec_altmode2port(struct typec_altmode *alt);
+
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+				 bool active);
+
+enum typec_plug_index {
+	TYPEC_PLUG_SOP_P,
+	TYPEC_PLUG_SOP_PP,
+};
+
+/*
+ * struct typec_plug_desc - USB Type-C Cable Plug Descriptor
+ * @index: SOP Prime for the plug connected to DFP and SOP Double Prime for the
+ *         plug connected to UFP
+ *
+ * Represents USB Type-C Cable Plug.
+ */
+struct typec_plug_desc {
+	enum typec_plug_index	index;
+};
+
+/*
+ * struct typec_cable_desc - USB Type-C Cable Descriptor
+ * @type: The plug type from USB PD Cable VDO
+ * @active: Is the cable active or passive
+ * @identity: Result of Discover Identity command
+ *
+ * Represents USB Type-C Cable attached to USB Type-C port.
+ */
+struct typec_cable_desc {
+	enum typec_plug_type	type;
+	unsigned int		active:1;
+	struct usb_pd_identity	*identity;
+};
+
+/*
+ * struct typec_partner_desc - USB Type-C Partner Descriptor
+ * @usb_pd: USB Power Delivery support
+ * @accessory: Audio, Debug or none.
+ * @identity: Discover Identity command data
+ *
+ * Details about a partner that is attached to USB Type-C port. If @identity
+ * member exists when partner is registered, a directory named "identity" is
+ * created to sysfs for the partner device.
+ */
+struct typec_partner_desc {
+	unsigned int		usb_pd:1;
+	enum typec_accessory	accessory;
+	struct usb_pd_identity	*identity;
+};
+
+/*
+ * struct typec_capability - USB Type-C Port Capabilities
+ * @role: DFP (Host-only), UFP (Device-only) or DRP (Dual Role)
+ * @revision: USB Type-C Specification release. Binary coded decimal
+ * @pd_revision: USB Power Delivery Specification revision if supported
+ * @prefer_role: Initial role preference
+ * @accessory: Supported Accessory Modes
+ * @fwnode: Optional fwnode of the port
+ * @try_role: Set data role preference 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;
+	u16			revision; /* 0120H = "1.2" */
+	u16			pd_revision; /* 0300H = "3.0" */
+	int			prefer_role;
+	enum typec_accessory	accessory[TYPEC_MAX_ACCESSORY];
+
+	struct fwnode_handle	*fwnode;
+
+	int		(*try_role)(const struct typec_capability *,
+				    int 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)(const struct typec_capability *,
+					 int mode, int activate);
+};
+
+/* Specific to try_role(). Indicates the user want's to clear the preference. */
+#define TYPEC_NO_PREFERRED_ROLE	(-1)
+
+struct typec_port *typec_register_port(struct device *parent,
+				       const struct typec_capability *cap);
+void typec_unregister_port(struct typec_port *port);
+
+struct typec_partner *typec_register_partner(struct typec_port *port,
+					     struct typec_partner_desc *desc);
+void typec_unregister_partner(struct typec_partner *partner);
+
+struct typec_cable *typec_register_cable(struct typec_port *port,
+					 struct typec_cable_desc *desc);
+void typec_unregister_cable(struct typec_cable *cable);
+
+struct typec_plug *typec_register_plug(struct typec_cable *cable,
+				       struct typec_plug_desc *desc);
+void typec_unregister_plug(struct typec_plug *plug);
+
+void typec_set_data_role(struct typec_port *port, enum typec_data_role role);
+void typec_set_pwr_role(struct typec_port *port, enum typec_role role);
+void typec_set_vconn_role(struct typec_port *port, enum typec_role role);
+void typec_set_pwr_opmode(struct typec_port *port, enum typec_pwr_opmode mode);
+
+#endif /* __LINUX_USB_TYPEC_H */
-- 
2.11.0