On Mon, Jan 16, 2017 at 05:56:13PM +0300, Heikki Krogerus wrote:
> 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.kroge...@linux.intel.com>
> Reviewed-by: Mika Westerberg <mika.westerb...@linux.intel.com>
> ---
> Documentation/ABI/testing/sysfs-class-typec | 289 ++++++
> 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 | 1263
> +++++++++++++++++++++++++++
> include/linux/usb/typec.h | 243 ++++++
> 9 files changed, 2001 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..09eb439246b0
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-class-typec
> @@ -0,0 +1,289 @@
> +USB Type-C port devices (eg. /sys/class/typec/port0/)
> +
> +What: /sys/class/typec/<port>/data_role
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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 are:
> + - 0 when the port is not the VCONN Source
> + - 1 when the port is the VCONN Source
> +
> +What: /sys/class/typec/<port>/power_operation_mode
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +Description:
> + Lists the Accessory Modes, defined in the USB Type-C
> + specification, the port supports.
> +
> +What: /sys/class/typec/<port>/supports_usb_power_delivery
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +Description:
> + Shows if the port supports USB Power Delivery communication.
> + - 1 if USB Power Delivery is supported
> + - 0 when it's not
> +
> +
> +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.kroge...@linux.intel.com>
> +Description:
> + Shows the Accessory Mode name when the partner is an Accesory.
> + 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.kroge...@linux.intel.com>
> +Description:
> + Shows if the partner supports USB Power Delivery:
> + - 0 when USB Power Delivery is not supported
> + - 1 when USB Power Delivery is supported
> +
> +What: /sys/class/typec/<port>-partner>/identity/
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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/active
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +Description:
> + Shows if the cable is active or passive.
> +
> + Valid values:
> + - 0 when the cable is passive
> + - 1 when the cable is active
> +
> +What: /sys/class/typec/<port>-cable/plug_type
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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
> +
> +What:
> /sys/class/typec/<port>-cable/supports_usb_power_delivery
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +Description:
> + Shows if the cable supports USB Power Delivery:
> + - 0 when USB Power Delivery is not supported
> + - 1 when USB Power Delivery is supported
> +
> +What: /sys/class/typec/<port>-cable>/identity/
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.kroge...@linux.intel.com>
> +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.
> +
> +What: /sys/class/typec/<dev>/<alternate mode>/svid
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +Description:
> + The SVID (Standard or Vendor ID) assigned by USB-IF for this
> + alternate mode.
> +
> +What: /sys/class/typec/<dev>/<alternate mode>/mode<index>/
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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/<dev>/<alternate
> mode>/mode<index>/active
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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:
> + - 0 when the mode is inactive
> + - 1 when the mode is active
> +
> +What: /sys/class/typec/<dev>/<alternate
> mode>/mode<index>/description
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +Description:
> + Shows description of the mode. The description is optional for
> + the drivers, just like with the Billboard Devices.
> +
> +What: /sys/class/typec/<dev>/<alternate mode>/mode<index>/vdo
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +Description:
> + Shows the VDO in hexadecimal returned by Discover Modes command
> + for this mode.
> +
> +What: /sys/class/typec/<port>/<alternate
> mode>/mode<index>/supported_roles
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +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.rst b/Documentation/usb/typec.rst
> new file mode 100644
> index 000000000000..3104d15336d9
> --- /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 alterante 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
> +deservers 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 e63063bdeab3..8f99825e9df1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12947,6 +12947,15 @@ F: drivers/usb/
> F: include/linux/usb.h
> F: include/linux/usb/
>
> +USB TYPEC SUBSYSTEM
> +M: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> +L: linux-usb@vger.kernel.org
> +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 <st...@rowland.harvard.edu>
> L: linux-usb@vger.kernel.org
> 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..a112ab7036f5
> --- /dev/null
> +++ b/drivers/usb/typec/typec.c
> @@ -0,0 +1,1263 @@
> +/*
> + * USB Type-C Connector Class
> + *
> + * Copyright (C) 2017, Intel Corporation
> + * Author: Heikki Krogerus <heikki.kroge...@linux.intel.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/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, "%d\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, "%d\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, "%d\n", id->product);
Do we really want to report id_header, cert status, and product id as integers
?
> +}
> +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, "%d\n", mode->active);
> +}
> +
> +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, "%d\n", p->usb_pd);
> +}
> +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
> +active_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct typec_cable *cable = to_typec_cable(dev);
> +
> + return sprintf(buf, "%d\n", cable->active);
> +}
> +static DEVICE_ATTR_RO(active);
> +
> +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_active.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);
> + enum typec_role role;
> + 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;
> + }
> +
> + if (sysfs_streq(buf, "1"))
> + role = TYPEC_SOURCE;
> + else if (sysfs_streq(buf, "0"))
> + role = TYPEC_SINK;
> + else
> + return -EINVAL;
> +
> + ret = port->cap->vconn_set(port->cap, role);
> + 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, "%d\n", port->vconn_role == TYPEC_SOURCE ? 1 : 0);
> +}
> +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;
> +
> + if (!port->cap->accessory)
This is an array, and thus never be 0 (or NULL).
> + return 0;
> +
> + for (i = 0; port->cap->accessory[i]; i++)
If all accessories from index 0 to TYPEC_MAX_ACCESSORY have a value in the
array, this code will happily keep going until it hits a 0.
> + ret += sprintf(buf + ret, "%s ",
> + typec_accessory_modes[port->cap->accessory[i]]);
> + buf[ret - 1] = '\n';
If accessory[0] is 0, this will happily access buf[-1].
> +
> + 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.kroge...@linux.intel.com>");
> +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..53d899af7065
> --- /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 (NULL terminated array)
It isn't really NULL terminated. If anything, it must be 0 terminated,
which doesn't really make sense since it has a fixed size. Might as well
use ARRAY_SIZE() when accessing it to ensure that accesses to it stay
in range. That would also be more secure.
> + * @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
>
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