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Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-typec | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec new file mode 100644 index 000000000000..d4a3d23eb09c --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -0,0 +1,276 @@ +USB Type-C port devices (eg. /sys/class/typec/port0/) + +What: /sys/class/typec/<port>/data_role +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: + - "no" when the port is not the VCONN Source + - "yes" when the port is the VCONN Source + +What: /sys/class/typec/<port>/power_operation_mode +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Space separated list of accessory modes, defined in the USB + Type-C specification, the port supports. + +What: /sys/class/typec/<port>/usb_power_delivery_revision +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Revision number of the supported USB Power Delivery + specification, or 0 when USB Power Delivery is not supported. + +What: /sys/class/typec/<port>/usb_typec_revision +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Revision number of the supported USB Type-C specification. + + +USB Type-C partner devices (eg. /sys/class/typec/port0-partner/) + +What: /sys/class/typec/<port>-partner/accessory_mode +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows the Accessory Mode name when the partner is an Accessory. + The Accessory Modes are defined in USB Type-C Specification. + +What: /sys/class/typec/<port>-partner/supports_usb_power_delivery +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows if the partner supports USB Power Delivery communication: + Valid values: yes, no + +What: /sys/class/typec/<port>-partner>/identity/ +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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/type +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows if the cable is active. + Valid values: active, passive + +What: /sys/class/typec/<port>-cable/plug_type +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows type of the plug on the cable: + - type-a - Standard A + - type-b - Standard B + - type-c + - captive + +What: /sys/class/typec/<port>-cable/identity/ +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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. Below <dev> refers to the device for +the alternate mode. + +What: /sys/class/typec/<port|partner|cable>/<dev>/svid +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + The SVID (Standard or Vendor ID) assigned by USB-IF for this + alternate mode. + +What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/ +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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/<port|partner|cable>/<dev>/mode<index>/description +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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/<port|partner|cable>/<dev>/mode<index>/vdo +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows the VDO in hexadecimal returned by Discover Modes command + for this mode. + +What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/active +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@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: yes, no + +What: /sys/class/typec/<port>/<dev>/mode<index>/supported_roles +Date: April 2017 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Space separated list of the supported roles. + + This attribute is available for the devices describing the + alternate modes a port supports, and it will not be exposed with + the devices presenting the alternate modes the partners or cable + plugs support. + + Valid values: source, sink |