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Date: Mon, 19 Dec 2016 09:22:33 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Oliver Neukum <oneukum@...e.com>
Cc: Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org
Subject: Re: [RFC PATCH] usb: USB Type-C connector class
On 12/19/2016 06:45 AM, 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.krogerus@...ux.intel.com>
> ---
> Documentation/ABI/testing/sysfs-class-typec | 220 ++++++
> Documentation/usb/typec.txt | 174 +++++
> 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 | 1047 +++++++++++++++++++++++++++
> include/linux/usb/typec.h | 212 ++++++
> 9 files changed, 1674 insertions(+)
> create mode 100644 Documentation/ABI/testing/sysfs-class-typec
> create mode 100644 Documentation/usb/typec.txt
> create mode 100644 drivers/usb/typec/Kconfig
> create mode 100644 drivers/usb/typec/Makefile
> create mode 100644 drivers/usb/typec/typec.c
> create mode 100644 include/linux/usb/typec.h
>
>
> Hi,
>
> There was one more change to the ABI: the ports are now named
> "port<id>" instead of "usbc<id>". Let me know if that is OK!
>
> The series is still being reviewed internally, but I'm sending this
> already here so you guys can take a look.
>
> The API now expects the drivers to register every part separately,
> including the alternate modes for the port itself. Structures for the
> partner/cable/plug/altmode are now protected, and the drivers need to
> register those with separate descriptor structures and get a handle to
> struct typec_partner/cable/plug/altmode if the registration is
> successful, or just NULL in case of failure as Greg proposed.
>
> As the drivers need to register the partners and the cables separately
> in any case, the drivers do not declare connections with the class
> anymore. If the default role changes during initial negotiation with a
> partner, the drivers need to notify the class before registering the
> partner or cable.
>
Can you also publish the Whiskey Cove driver ? That might help figuring out
the necessary driver changes.
Thanks,
Guenter
>
> Thanks,
>
>
> diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
> new file mode 100644
> index 0000000..663709a
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-class-typec
> @@ -0,0 +1,220 @@
> +USB Type-C port devices (eg. /sys/class/typec/port0/)
> +
> +What: /sys/class/typec/<port>/current_data_role
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + The current USB data role the port is operating in. 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.
> +
> + Valid values:
> + - host
> + - device
> +
> +What: /sys/class/typec/<port>/current_power_role
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + The current power role of the port. 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.
> +
> + Valid values:
> + - source
> + - sink
> +
> +What: /sys/class/typec/<port>/vconn_source
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.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.krogerus@...ux.intel.com>
> +Description:
> + Shows the current power operational mode the port is in.
> +
> + Valid values:
> + - USB - Normal power levels defined in USB specifications
> + - USB Type-C 1.5A - Higher 1.5A current defined in USB Type-C
> + specification.
> + - USB Type-C 3.0A - Higher 3A current defined in USB Type-C
> + specification.
> + - USB Power Delivery - The voltages and currents defined in USB
> + Power Delivery specification
> +
> +What: /sys/class/typec/<port>/preferred_role
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.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 there is no preferred role.
> +
> + Valid values:
> + - source
> + - sink
> + - none - to remove preference
> +
> +What: /sys/class/typec/<port>/supported_accessory_modes
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + Lists the Accessory Modes, defined in the USB Type-C
> + specification, the port supports.
> +
> +What: /sys/class/typec/<port>/supported_data_roles
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + Lists the USB data roles the port is capable of supporting.
> +
> + Valid values:
> + - device
> + - host
> + - device, host (DRD as defined in USB Type-C specification v1.2)
> +
> +What: /sys/class/typec/<port>/supported_power_roles
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + Lists the power roles the port is capable of supporting.
> +
> + Valid values:
> + - source
> + - sink
> + - source, sink (DRP as defined in USB Type-C specification v1.2)
> +
> +What: /sys/class/typec/<port>/supports_usb_power_delivery
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + Shows if the port supports USB Power Delivery.
> + - 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.krogerus@...ux.intel.com>
> +Description:
> + Shows the Accessory Mode name, or "no" when the partner does not
> + support Accesory Modes. 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@...ux.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
> +
> +
> +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 their 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.krogerus@...ux.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.krogerus@...ux.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.krogerus@...ux.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
> +
> +
> +Alternate Mode devices (For example,
> +/sys/class/typec/port0-partner/port0-partner.svid:xxxx/). The ports, partners
> +and cable plugs can have alternate modes.
> +
> +What: /sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/active
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.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 deactive
> + - 1 when the mode is active
> +
> +What: /sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/description
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.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>/<dev>.svid:<svid>/<mode>/vdo
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> + Shows the VDO in hexadecimal returned from the Discover Modes
> + command.
> +
> +What: /sys/class/typec/<port>/<port>.svid:<svid>/<mode>/supported_roles
> +Date: February 2017
> +Contact: Heikki Krogerus <heikki.krogerus@...ux.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.txt b/Documentation/usb/typec.txt
> new file mode 100644
> index 0000000..e588657
> --- /dev/null
> +++ b/Documentation/usb/typec.txt
> @@ -0,0 +1,174 @@
> +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.
> +
> +
> +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. The
> +partner attached to port "port0" will be named "port0-partner". Full path to the
> +device would be /sys/class/typec/usb0/usb0-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 Alternate Mode
> +SVID will have their own device describing them. The Alternate Modes will not be
> +attached to the typec class. For the port's "port0" partner, the Alternate Modes
> +would have devices 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/port0.svid:xxxx/mode0/. The
> +requests for entering/exiting a mode happens with "active" attribute file in
> +that group.
> +
> +
> +API
> +---
> +
> +The functions and structures of the class are defined in
> +linux/include/usb/typec.h header.
> +
> +
> +* Registering the ports
> +
> +The port drivers will describe every Type-C port they control with struct
> +typec_capability data structure, and register them with the following API:
> +
> +struct typec_port *typec_register_port(struct device *parent,
> + const struct typec_capability *cap);
> +
> +The class will provide handle to struct typec_port on success and NULL on
> +failure. The un-registration of the port happens with the following API:
> +
> +void typec_unregister_port(struct typec_port *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.
> +
> +struct typec_partner *typec_register_partner(struct typec_port *port,
> + struct typec_partner_desc *desc);
> +void typec_unregister_partner(struct typec_partner *partner);
> +
> +The class will provide a handle to struct typec_partner if the registration was
> +successful, or NULL.
> +
> +
> +* 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 maximum two plugs the cable has with the class. Details about the
> +cable need to be described in struct typec_cable_desc and about the 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:
> +
> +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);
> +
> +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.
> +
> +
> +* Notifications
> +
> +When the partner end 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:
> +
> +void typec_set_data_role(struct typec_port *, enum typec_data_role);
> +void typec_set_pwr_role(struct typec_port *, enum typec_role);
> +void typec_set_vconn_role(struct typec_port *, enum typec_role);
> +void typec_set_pwr_opmode(struct typec_port *, enum typec_pwr_opmode);
> +
> +
> +* Alternate Modes
> +
> +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 SVID will support 1 - 7 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:
> +
> +struct typec_altmode
> +*typec_port_register_altmode(struct typec_port *port,
> + struct typec_altmode_desc *desc);
> +
> +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
> +with the following API.
> +
> +API for the partners:
> +
> +struct typec_altmode
> +*typec_partner_register_altmode(struct typec_partner *partner,
> + struct typec_altmode_desc *desc);
> +
> +API for the Cable Plugs:
> +
> +struct typec_altmode
> +*typec_plug_register_altmode(struct typec_plug *plug,
> + struct typec_altmode_desc *desc);
> +
> +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:
> +
> +void typec_unregister_altmode(struct typec_altmode *altmode);
> +
> +If a partner or cable plug enters or exits a mode, the port driver needs to
> +notify the class with the following API:
> +
> +void typec_altmode_update_active(struct typec_altmode *alt, int mode,
> + bool active);
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 10581bd..bcc88cd 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12873,6 +12873,15 @@ F: drivers/usb/
> F: include/linux/usb.h
> F: include/linux/usb/
>
> +USB TYPEC SUBSYSTEM
> +M: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +L: linux-usb@...r.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 <stern@...land.harvard.edu>
> L: linux-usb@...r.kernel.org
> diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
> index fbe493d..89c322e 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 7791af6..c7f4098 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 0000000..17792f9
> --- /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 0000000..1012a8b
> --- /dev/null
> +++ b/drivers/usb/typec/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_TYPEC) += typec.o
> diff --git a/drivers/usb/typec/typec.c b/drivers/usb/typec/typec.c
> new file mode 100644
> index 0000000..0e9dd2e
> --- /dev/null
> +++ b/drivers/usb/typec/typec.c
> @@ -0,0 +1,1047 @@
> +/*
> + * USB Type-C Connector Class
> + *
> + * Copyright (C) 2017, Intel Corporation
> + * Author: Heikki Krogerus <heikki.krogerus@...ux.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>
> +
> +/* XXX: Once we have a header for USB Power Delivery, this belongs there */
> +#define ALTMODE_MAX_N_MODES 7
> +
> +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_N_MODES];
> + const struct attribute_group *mode_groups[ALTMODE_MAX_N_MODES];
> +};
> +
> +struct typec_plug {
> + struct device dev;
> + enum typec_plug_index index;
> +};
> +
> +struct typec_cable {
> + struct device dev;
> + u16 pd_revision;
> + enum typec_plug_type type;
> + u32 vdo;
> + unsigned int active:1;
> +};
> +
> +struct typec_partner {
> + struct device dev;
> + u16 pd_revision;
> + u32 vdo;
> + 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 struct device_type typec_partner_dev_type;
> +static struct device_type typec_cable_dev_type;
> +static struct device_type typec_plug_dev_type;
> +static 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] = "",
> + [TYPEC_ACCESSORY_AUDIO] = "Audio Adapter Accessory Mode",
> + [TYPEC_ACCESSORY_DEBUG] = "Debug Accessory Mode",
> +};
> +
> +static ssize_t usb_power_delivery_revision_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + u16 rev = 0;
> +
> + if (is_typec_partner(dev)) {
> + struct typec_partner *p = to_typec_partner(dev);
> +
> + rev = p->pd_revision;
> + } else if (is_typec_cable(dev)) {
> + struct typec_cable *p = to_typec_cable(dev);
> +
> + rev = p->pd_revision;
> + } else if (is_typec_port(dev)) {
> + struct typec_port *p = to_typec_port(dev);
> +
> + rev = p->cap->pd_revision;
> + }
> +
> + return sprintf(buf, "%d\n", (rev >> 8) & 0xff);
> +}
> +static DEVICE_ATTR_RO(usb_power_delivery_revision);
> +
> +static ssize_t
> +vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + u32 vdo = 0;
> +
> + if (is_typec_partner(dev)) {
> + struct typec_partner *p = to_typec_partner(dev);
> +
> + vdo = p->vdo;
> + } else if (is_typec_cable(dev)) {
> + struct typec_cable *p = to_typec_cable(dev);
> +
> + vdo = p->vdo;
> + }
> +
> + return sprintf(buf, "0x%08x\n", vdo);
> +}
> +static DEVICE_ATTR_RO(vdo);
> +
> +/* ------------------------------------------------------------------------- */
> +/* Alternate Modes */
> +
> +/*
> + * typec_altmode_update_active - Notify about Enter/Exit mode
> + * @alt: Handle to the Alternate Mode
> + * @mode: Mode index
> + * @active: True when the mode has been enterred
> + */
> +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, 6, "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 the port that the 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 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 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\nsink\n");
> + break;
> + }
> + return ret;
> +}
> +
> +static inline 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 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.release = typec_altmode_release;
> + dev_set_name(&alt->dev, "%s.svid:%04x", dev_name(parent), alt->svid);
> +
> + ret = device_register(&alt->dev);
> + if (ret) {
> + int i;
> +
> + dev_err(parent, "failed to register alternate mode (%d)\n",
> + ret);
> +
> + put_device(&alt->dev);
> +
> + for (i = 0; i < alt->n_modes; i++)
> + kfree(alt->modes[i].desc);
> + kfree(alt);
> + return NULL;
> + }
> +
> + return alt;
> +}
> +
> +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 struct attribute *typec_partner_attrs[] = {
> + &dev_attr_vdo.attr,
> + &dev_attr_accessory_mode.attr,
> + &dev_attr_usb_power_delivery_revision.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 struct device_type typec_partner_dev_type = {
> + .name = "typec_partner_device",
> + .groups = typec_partner_groups,
> + .release = typec_partner_release,
> +};
> +
> +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);
> +
> +struct typec_partner *typec_register_partner(struct typec_port *port,
> + struct typec_partner_desc *desc)
> +{
> + struct typec_partner *partner = NULL;
> + int ret;
> +
> + partner = kzalloc(sizeof(*partner), GFP_KERNEL);
> + if (!partner)
> + return NULL;
> +
> + partner->vdo = desc->vdo;
> + partner->accessory = desc->accessory;
> + partner->pd_revision = desc->pd_revision;
> +
> + 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);
> + kfree(partner);
> + return NULL;
> + }
> +
> + return partner;
> +}
> +EXPORT_SYMBOL_GPL(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 struct device_type typec_plug_dev_type = {
> + .name = "typec_plug_device",
> + .release = typec_plug_release,
> +};
> +
> +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);
> +
> +struct typec_plug *typec_register_plug(struct typec_cable *cable,
> + struct typec_plug_desc *desc)
> +{
> + struct typec_plug *plug = NULL;
> + 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);
> + kfree(plug);
> + return NULL;
> + }
> +
> + return plug;
> +}
> +EXPORT_SYMBOL_GPL(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,
> + &dev_attr_usb_power_delivery_revision.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 struct device_type typec_cable_dev_type = {
> + .name = "typec_cable_device",
> + .groups = typec_cable_groups,
> + .release = typec_cable_release,
> +};
> +
> +struct typec_cable *typec_register_cable(struct typec_port *port,
> + struct typec_cable_desc *desc)
> +{
> + struct typec_cable *cable = NULL;
> + int ret;
> +
> + cable = kzalloc(sizeof(*cable), GFP_KERNEL);
> + if (!cable)
> + return NULL;
> +
> + cable->type = desc->type;
> + cable->vdo = desc->vdo;
> + cable->active = desc->active;
> + cable->pd_revision = desc->pd_revision;
> +
> + 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);
> + kfree(cable);
> + return NULL;
> + }
> +
> + return cable;
> +}
> +EXPORT_SYMBOL_GPL(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 */
> +
> +/* --------------------------------------- */
> +/* Driver callbacks to report role updates */
> +
> +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, "current_data_role");
> + kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
> +}
> +EXPORT_SYMBOL_GPL(typec_set_data_role);
> +
> +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, "current_power_role");
> + kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
> +}
> +EXPORT_SYMBOL_GPL(typec_set_pwr_role);
> +
> +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, "current_vconn_role");
> + kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
> +}
> +EXPORT_SYMBOL_GPL(typec_set_vconn_role);
> +
> +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);
> +
> +/* --------------------------------------- */
> +
> +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
> +current_data_role_store(struct device *dev, struct device_attribute *attr,
> + const char *buf, size_t size)
> +{
> + struct typec_port *port = to_typec_port(dev);
> + int ret;
> +
> + 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
> +current_data_role_show(struct device *dev, struct device_attribute *attr,
> + char *buf)
> +{
> + struct typec_port *port = to_typec_port(dev);
> +
> + return sprintf(buf, "%s\n", typec_data_roles[port->data_role]);
> +}
> +static DEVICE_ATTR_RW(current_data_role);
> +
> +static ssize_t supported_data_roles_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct typec_port *port = to_typec_port(dev);
> +
> + if (port->cap->type == TYPEC_PORT_DRP)
> + return sprintf(buf, "host\ndevice\n");
> +
> + return sprintf(buf, "%s\n", typec_data_roles[port->data_role]);
> +}
> +static DEVICE_ATTR_RO(supported_data_roles);
> +
> +static ssize_t current_power_role_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t size)
> +{
> + struct typec_port *port = to_typec_port(dev);
> + int ret = size;
> +
> + if (!port->cap->pd_revision) {
> + dev_dbg(dev, "power role swap only supported with USB PD\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 current_power_role_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct typec_port *port = to_typec_port(dev);
> +
> + return sprintf(buf, "%s\n", typec_roles[port->pwr_role]);
> +}
> +static DEVICE_ATTR_RW(current_power_role);
> +
> +static ssize_t supported_power_roles_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct typec_port *port = to_typec_port(dev);
> +
> + if (port->cap->pd_revision || port->cap->type == TYPEC_PORT_DRP)
> + return sprintf(buf, "source\nsink\n");
> +
> + return sprintf(buf, "%s\n", typec_roles[port->pwr_role]);
> +}
> +static DEVICE_ATTR_RO(supported_power_roles);
> +
> +static const char * const typec_pwr_opmodes[] = {
> + [TYPEC_PWR_MODE_USB] = "USB",
> + [TYPEC_PWR_MODE_1_5A] = "USB Type-C 1.5A",
> + [TYPEC_PWR_MODE_3_0A] = "USB Type-C 3.0A",
> + [TYPEC_PWR_MODE_PD] = "USB Power Delivery",
> +};
> +
> +static ssize_t power_operation_mode_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct typec_port *port = to_typec_port(dev);
> +
> + 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 only supported with USB PD\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)
> + return 0;
> +
> + for (i = 0; port->cap->accessory[i]; i++)
> + ret += sprintf(buf + ret, "%s\n",
> + typec_accessory_modes[port->cap->accessory[i]]);
> + 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 struct attribute *typec_attrs[] = {
> + &dev_attr_current_power_role.attr,
> + &dev_attr_current_data_role.attr,
> + &dev_attr_power_operation_mode.attr,
> + &dev_attr_preferred_role.attr,
> + &dev_attr_supported_accessory_modes.attr,
> + &dev_attr_supported_data_roles.attr,
> + &dev_attr_supported_power_roles.attr,
> + &dev_attr_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 struct device_type typec_port_dev_type = {
> + .name = "typec_port",
> + .groups = typec_groups,
> + .uevent = typec_uevent,
> + .release = typec_release,
> +};
> +
> +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);
> +
> +struct typec_port *typec_register_port(struct device *parent,
> + const struct typec_capability *cap)
> +{
> + struct typec_port *port;
> + enum typec_role 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.type = &typec_port_dev_type;
> + port->dev.class = typec_class;
> + port->dev.parent = parent;
> + 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);
> + ida_simple_remove(&typec_index_ida, id);
> + put_device(&port->dev);
> + kfree(port);
> + return NULL;
> + }
> +
> + return port;
> +}
> +EXPORT_SYMBOL_GPL(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@...ux.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 0000000..37b996c
> --- /dev/null
> +++ b/include/linux/usb/typec.h
> @@ -0,0 +1,212 @@
> +
> +#ifndef __LINUX_USB_TYPEC_H
> +#define __LINUX_USB_TYPEC_H
> +
> +#include <linux/types.h>
> +
> +/* 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;
> +
> +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,
> +};
> +
> +/*
> + * 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;
> +};
> +
> +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
> + * @pd_revision: USB Power Delivery Specification revision
> + * @type: The plug type from USB PD Cable VDO
> + * @active: Is the cable active or passive
> + *
> + * Represents USB Type-C Cable attached to USB Type-C port.
> + */
> +struct typec_cable_desc {
> + u16 pd_revision; /* 0300H = "3.0" */
> + enum typec_plug_type type;
> + u32 vdo;
> + unsigned int active:1;
> +};
> +
> +/*
> + * struct typec_partner_desc - USB Type-C Partner Descriptor
> + * @pd_revision: USB Power Delivery Specification revision (0 = no USB PD)
> + * @vdo: VDO returned by Discover Identity USB PD command
> + * @accessory: Audio, Debug or none.
> + *
> + * Details about a partner that is attached to USB Type-C port.
> + */
> +struct typec_partner_desc {
> + u16 pd_revision; /* 0300H = "3.0" */
> + u32 vdo;
> + enum typec_accessory accessory;
> +};
> +
> +/*
> + * 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)
> + * @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;
> +
> + 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 */
>
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