usb: typec: Bus type for alternate modes

Introducing a simple bus for the alternate modes. Bus allows
binding drivers to the discovered alternate modes the
partners support.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 53 insertions, 60 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-typec b/Documentation/ABI/testing/sysfs-bus-typec
new file mode 100644
index 0000000..205d9c9
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-typec
@@ -0,0 +1,51 @@
+What:		/sys/bus/typec/devices/.../active
+Date:		July 2018
+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. 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 are boolean.
+
+What:		/sys/bus/typec/devices/.../description
+Date:		July 2018
+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/bus/typec/devices/.../mode
+Date:		July 2018
+Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+		The index number of the mode returned by Discover Modes USB
+		Power Delivery command. Depending on the alternate mode, the
+		mode index may be significant.
+
+		With some alternate modes (SVIDs), the mode index is assigned
+		for specific functionality in the specification for that
+		alternate mode.
+
+		With other alternate modes, the mode index values are not
+		assigned, and can not be therefore used for identification. When
+		the mode index is not assigned, identifying the alternate mode
+		must be done with either mode VDO or the description.
+
+What:		/sys/bus/typec/devices/.../svid
+Date:		July 2018
+Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+		The Standard or Vendor ID (SVID) assigned by USB-IF for this
+		alternate mode.
+
+What:		/sys/bus/typec/devices/.../vdo
+Date:		July 2018
+Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+		Shows the VDO in hexadecimal returned by Discover Modes command
+		for this mode.
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
index 5be552e..d7647b2 100644
--- a/Documentation/ABI/testing/sysfs-class-typec
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -222,70 +222,12 @@ Description:
 		available. The value can be polled.
 
 
-Alternate Mode devices.
+USB Type-C port 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
+What:		/sys/class/typec/<port>/<alt mode>/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