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>
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48
Documentation/ABI/obsolete/sysfs-class-typec
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48
Documentation/ABI/obsolete/sysfs-class-typec
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@ -0,0 +1,48 @@
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These files are deprecated and will be removed. The same files are available
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under /sys/bus/typec (see Documentation/ABI/testing/sysfs-bus-typec).
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What: /sys/class/typec/<port|partner|cable>/<dev>/svid
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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The SVID (Standard or Vendor ID) assigned by USB-IF for this
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alternate mode.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Every supported mode will have its own directory. The name of
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a mode will be "mode<index>" (for example mode1), where <index>
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is the actual index to the mode VDO returned by Discover Modes
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USB power delivery command.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/description
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows description of the mode. The description is optional for
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the drivers, just like with the Billboard Devices.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/vdo
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows the VDO in hexadecimal returned by Discover Modes command
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for this mode.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/active
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows if the mode is active or not. The attribute can be used
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for entering/exiting the mode with partners and cable plugs, and
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with the port alternate modes it can be used for disabling
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support for specific alternate modes. Entering/exiting modes is
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supported as synchronous operation so write(2) to the attribute
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does not return until the enter/exit mode operation has
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finished. The attribute is notified when the mode is
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entered/exited so poll(2) on the attribute wakes up.
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Entering/exiting a mode will also generate uevent KOBJ_CHANGE.
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Valid values: yes, no
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51
Documentation/ABI/testing/sysfs-bus-typec
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51
Documentation/ABI/testing/sysfs-bus-typec
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@ -0,0 +1,51 @@
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What: /sys/bus/typec/devices/.../active
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Date: July 2018
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows if the mode is active or not. The attribute can be used
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for entering/exiting the mode. Entering/exiting modes is
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supported as synchronous operation so write(2) to the attribute
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does not return until the enter/exit mode operation has
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finished. The attribute is notified when the mode is
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entered/exited so poll(2) on the attribute wakes up.
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Entering/exiting a mode will also generate uevent KOBJ_CHANGE.
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Valid values are boolean.
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What: /sys/bus/typec/devices/.../description
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Date: July 2018
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows description of the mode. The description is optional for
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the drivers, just like with the Billboard Devices.
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What: /sys/bus/typec/devices/.../mode
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Date: July 2018
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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The index number of the mode returned by Discover Modes USB
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Power Delivery command. Depending on the alternate mode, the
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mode index may be significant.
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With some alternate modes (SVIDs), the mode index is assigned
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for specific functionality in the specification for that
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alternate mode.
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With other alternate modes, the mode index values are not
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assigned, and can not be therefore used for identification. When
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the mode index is not assigned, identifying the alternate mode
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must be done with either mode VDO or the description.
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What: /sys/bus/typec/devices/.../svid
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Date: July 2018
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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The Standard or Vendor ID (SVID) assigned by USB-IF for this
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alternate mode.
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What: /sys/bus/typec/devices/.../vdo
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Date: July 2018
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows the VDO in hexadecimal returned by Discover Modes command
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for this mode.
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@ -222,70 +222,12 @@ Description:
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available. The value can be polled.
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Alternate Mode devices.
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USB Type-C port alternate mode devices.
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The alternate modes will have Standard or Vendor ID (SVID) assigned by USB-IF.
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The ports, partners and cable plugs can have alternate modes. A supported SVID
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will consist of a set of modes. Every SVID a port/partner/plug supports will
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have a device created for it, and every supported mode for a supported SVID will
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have its own directory under that device. Below <dev> refers to the device for
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the alternate mode.
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What: /sys/class/typec/<port|partner|cable>/<dev>/svid
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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The SVID (Standard or Vendor ID) assigned by USB-IF for this
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alternate mode.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Every supported mode will have its own directory. The name of
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a mode will be "mode<index>" (for example mode1), where <index>
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is the actual index to the mode VDO returned by Discover Modes
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USB power delivery command.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/description
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows description of the mode. The description is optional for
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the drivers, just like with the Billboard Devices.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/vdo
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows the VDO in hexadecimal returned by Discover Modes command
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for this mode.
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What: /sys/class/typec/<port|partner|cable>/<dev>/mode<index>/active
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Shows if the mode is active or not. The attribute can be used
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for entering/exiting the mode with partners and cable plugs, and
|
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with the port alternate modes it can be used for disabling
|
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support for specific alternate modes. Entering/exiting modes is
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supported as synchronous operation so write(2) to the attribute
|
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does not return until the enter/exit mode operation has
|
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finished. The attribute is notified when the mode is
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entered/exited so poll(2) on the attribute wakes up.
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Entering/exiting a mode will also generate uevent KOBJ_CHANGE.
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Valid values: yes, no
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What: /sys/class/typec/<port>/<dev>/mode<index>/supported_roles
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What: /sys/class/typec/<port>/<alt mode>/supported_roles
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Date: April 2017
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Space separated list of the supported roles.
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This attribute is available for the devices describing the
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alternate modes a port supports, and it will not be exposed with
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the devices presenting the alternate modes the partners or cable
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plugs support.
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Valid values: source, sink
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136
Documentation/driver-api/usb/typec_bus.rst
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136
Documentation/driver-api/usb/typec_bus.rst
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API for USB Type-C Alternate Mode drivers
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=========================================
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Introduction
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------------
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Alternate modes require communication with the partner using Vendor Defined
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Messages (VDM) as defined in USB Type-C and USB Power Delivery Specifications.
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The communication is SVID (Standard or Vendor ID) specific, i.e. specific for
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every alternate mode, so every alternate mode will need a custom driver.
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USB Type-C bus allows binding a driver to the discovered partner alternate
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modes by using the SVID and the mode number.
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USB Type-C Connector Class provides a device for every alternate mode a port
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supports, and separate device for every alternate mode the partner supports.
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The drivers for the alternate modes are bound to the partner alternate mode
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devices, and the port alternate mode devices must be handled by the port
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drivers.
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When a new partner alternate mode device is registered, it is linked to the
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alternate mode device of the port that the partner is attached to, that has
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matching SVID and mode. Communication between the port driver and alternate mode
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driver will happen using the same API.
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The port alternate mode devices are used as a proxy between the partner and the
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alternate mode drivers, so the port drivers are only expected to pass the SVID
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specific commands from the alternate mode drivers to the partner, and from the
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partners to the alternate mode drivers. No direct SVID specific communication is
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needed from the port drivers, but the port drivers need to provide the operation
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callbacks for the port alternate mode devices, just like the alternate mode
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drivers need to provide them for the partner alternate mode devices.
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Usage:
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------
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General
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~~~~~~~
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By default, the alternate mode drivers are responsible for entering the mode.
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It is also possible to leave the decision about entering the mode to the user
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space (See Documentation/ABI/testing/sysfs-class-typec). Port drivers should not
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enter any modes on their own.
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``->vdm`` is the most important callback in the operation callbacks vector. It
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will be used to deliver all the SVID specific commands from the partner to the
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alternate mode driver, and vice versa in case of port drivers. The drivers send
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the SVID specific commands to each other using :c:func:`typec_altmode_vmd()`.
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If the communication with the partner using the SVID specific commands results
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in need to reconfigure the pins on the connector, the alternate mode driver
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needs to notify the bus using :c:func:`typec_altmode_notify()`. The driver
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passes the negotiated SVID specific pin configuration value to the function as
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parameter. The bus driver will then configure the mux behind the connector using
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that value as the state value for the mux, and also call blocking notification
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chain to notify the external drivers about the state of the connector that need
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to know it.
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NOTE: The SVID specific pin configuration values must always start from
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``TYPEC_STATE_MODAL``. USB Type-C specification defines two default states for
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the connector: ``TYPEC_STATE_USB`` and ``TYPEC_STATE_SAFE``. These values are
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reserved by the bus as the first possible values for the state. When the
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alternate mode is entered, the bus will put the connector into
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``TYPEC_STATE_SAFE`` before sending Enter or Exit Mode command as defined in USB
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Type-C Specification, and also put the connector back to ``TYPEC_STATE_USB``
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after the mode has been exited.
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An example of working definitions for SVID specific pin configurations would
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look like this:
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enum {
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ALTMODEX_CONF_A = TYPEC_STATE_MODAL,
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ALTMODEX_CONF_B,
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...
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};
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Helper macro ``TYPEC_MODAL_STATE()`` can also be used:
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#define ALTMODEX_CONF_A = TYPEC_MODAL_STATE(0);
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#define ALTMODEX_CONF_B = TYPEC_MODAL_STATE(1);
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Notification chain
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~~~~~~~~~~~~~~~~~~
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The drivers for the components that the alternate modes are designed for need to
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get details regarding the results of the negotiation with the partner, and the
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pin configuration of the connector. In case of DisplayPort alternate mode for
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example, the GPU drivers will need to know those details. In case of
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Thunderbolt alternate mode, the thunderbolt drivers will need to know them, and
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so on.
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The notification chain is designed for this purpose. The drivers can register
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notifiers with :c:func:`typec_altmode_register_notifier()`.
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Cable plug alternate modes
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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The alternate mode drivers are not bound to cable plug alternate mode devices,
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only to the partner alternate mode devices. If the alternate mode supports, or
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requires, a cable that responds to SOP Prime, and optionally SOP Double Prime
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messages, the driver for that alternate mode must request handle to the cable
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plug alternate modes using :c:func:`typec_altmode_get_plug()`, and take over
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their control.
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Driver API
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----------
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Alternate mode driver registering/unregistering
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/usb/typec/bus.c
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:functions: typec_altmode_register_driver typec_altmode_unregister_driver
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Alternate mode driver operations
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/usb/typec/bus.c
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:functions: typec_altmode_enter typec_altmode_exit typec_altmode_attention typec_altmode_vdm typec_altmode_notify
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API for the port drivers
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~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/usb/typec/bus.c
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:functions: typec_match_altmode
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Cable Plug operations
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~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/usb/typec/bus.c
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:functions: typec_altmode_get_plug typec_altmode_put_plug
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Notifications
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~~~~~~~~~~~~~
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.. kernel-doc:: drivers/usb/typec/class.c
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:functions: typec_altmode_register_notifier typec_altmode_unregister_notifier
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11
MAINTAINERS
11
MAINTAINERS
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@ -14955,7 +14955,7 @@ L: linux-usb@vger.kernel.org
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S: Maintained
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F: drivers/usb/typec/mux/pi3usb30532.c
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USB TYPEC SUBSYSTEM
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USB TYPEC CLASS
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M: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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L: linux-usb@vger.kernel.org
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S: Maintained
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|
@ -14964,6 +14964,15 @@ F: Documentation/driver-api/usb/typec.rst
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F: drivers/usb/typec/
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F: include/linux/usb/typec.h
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USB TYPEC BUS FOR ALTERNATE MODES
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M: Heikki Krogerus <heikki.krogerus@linux.intel.com>
|
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L: linux-usb@vger.kernel.org
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S: Maintained
|
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F: Documentation/ABI/testing/sysfs-bus-typec
|
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F: Documentation/driver-api/usb/typec_bus.rst
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F: drivers/usb/typec/altmodes/
|
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F: include/linux/usb/typec_altmode.h
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USB UHCI DRIVER
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M: Alan Stern <stern@rowland.harvard.edu>
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L: linux-usb@vger.kernel.org
|
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|
|
|
@ -1,6 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_TYPEC) += typec.o
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typec-y := class.o mux.o
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typec-y := class.o mux.o bus.o
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obj-$(CONFIG_TYPEC_TCPM) += tcpm.o
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obj-y += fusb302/
|
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obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o
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|
|
401
drivers/usb/typec/bus.c
Normal file
401
drivers/usb/typec/bus.c
Normal file
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@ -0,0 +1,401 @@
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// SPDX-License-Identifier: GPL-2.0
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/**
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* Bus for USB Type-C Alternate Modes
|
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*
|
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* Copyright (C) 2018 Intel Corporation
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* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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*/
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#include <linux/usb/pd_vdo.h>
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#include "bus.h"
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static inline int typec_altmode_set_mux(struct altmode *alt, u8 state)
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{
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return alt->mux ? alt->mux->set(alt->mux, state) : 0;
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}
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static int typec_altmode_set_state(struct typec_altmode *adev, int state)
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{
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bool is_port = is_typec_port(adev->dev.parent);
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struct altmode *port_altmode;
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int ret;
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||||
port_altmode = is_port ? to_altmode(adev) : to_altmode(adev)->partner;
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||||
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||||
ret = typec_altmode_set_mux(port_altmode, state);
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if (ret)
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return ret;
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||||
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||||
blocking_notifier_call_chain(&port_altmode->nh, state, NULL);
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||||
return 0;
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}
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/* -------------------------------------------------------------------------- */
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/* Common API */
|
||||
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/**
|
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* typec_altmode_notify - Communication between the OS and alternate mode driver
|
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* @adev: Handle to the alternate mode
|
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* @conf: Alternate mode specific configuration value
|
||||
* @data: Alternate mode specific data
|
||||
*
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||||
* The primary purpose for this function is to allow the alternate mode drivers
|
||||
* to tell which pin configuration has been negotiated with the partner. That
|
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* information will then be used for example to configure the muxes.
|
||||
* Communication to the other direction is also possible, and low level device
|
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* drivers can also send notifications to the alternate mode drivers. The actual
|
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* communication will be specific for every SVID.
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*/
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||||
int typec_altmode_notify(struct typec_altmode *adev,
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unsigned long conf, void *data)
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{
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bool is_port = is_typec_port(adev->dev.parent);
|
||||
struct altmode *altmode;
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||||
struct altmode *partner;
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||||
int ret;
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||||
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||||
if (!adev)
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return 0;
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||||
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||||
altmode = to_altmode(adev);
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||||
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||||
if (!altmode->partner)
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||||
return -ENODEV;
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||||
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||||
partner = altmode->partner;
|
||||
|
||||
ret = typec_altmode_set_mux(is_port ? altmode : partner, (u8)conf);
|
||||
if (ret)
|
||||
return ret;
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||||
|
||||
blocking_notifier_call_chain(is_port ? &altmode->nh : &partner->nh,
|
||||
conf, data);
|
||||
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||||
if (partner->adev.ops && partner->adev.ops->notify)
|
||||
return partner->adev.ops->notify(&partner->adev, conf, data);
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||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_notify);
|
||||
|
||||
/**
|
||||
* typec_altmode_enter - Enter Mode
|
||||
* @adev: The alternate mode
|
||||
*
|
||||
* The alternate mode drivers use this function to enter mode. The port drivers
|
||||
* use this to inform the alternate mode drivers that the partner has initiated
|
||||
* Enter Mode command.
|
||||
*/
|
||||
int typec_altmode_enter(struct typec_altmode *adev)
|
||||
{
|
||||
struct altmode *partner = to_altmode(adev)->partner;
|
||||
struct typec_altmode *pdev = &partner->adev;
|
||||
int ret;
|
||||
|
||||
if (!adev || adev->active)
|
||||
return 0;
|
||||
|
||||
if (!pdev->ops || !pdev->ops->enter)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
/* Moving to USB Safe State */
|
||||
ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Enter Mode */
|
||||
return pdev->ops->enter(pdev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_enter);
|
||||
|
||||
/**
|
||||
* typec_altmode_exit - Exit Mode
|
||||
* @adev: The alternate mode
|
||||
*
|
||||
* The partner of @adev has initiated Exit Mode command.
|
||||
*/
|
||||
int typec_altmode_exit(struct typec_altmode *adev)
|
||||
{
|
||||
struct altmode *partner = to_altmode(adev)->partner;
|
||||
struct typec_altmode *pdev = &partner->adev;
|
||||
int ret;
|
||||
|
||||
if (!adev || !adev->active)
|
||||
return 0;
|
||||
|
||||
if (!pdev->ops || !pdev->ops->enter)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
/* Moving to USB Safe State */
|
||||
ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Exit Mode command */
|
||||
return pdev->ops->exit(pdev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_exit);
|
||||
|
||||
/**
|
||||
* typec_altmode_attention - Attention command
|
||||
* @adev: The alternate mode
|
||||
* @vdo: VDO for the Attention command
|
||||
*
|
||||
* Notifies the partner of @adev about Attention command.
|
||||
*/
|
||||
void typec_altmode_attention(struct typec_altmode *adev, u32 vdo)
|
||||
{
|
||||
struct typec_altmode *pdev = &to_altmode(adev)->partner->adev;
|
||||
|
||||
if (pdev->ops && pdev->ops->attention)
|
||||
pdev->ops->attention(pdev, vdo);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_attention);
|
||||
|
||||
/**
|
||||
* typec_altmode_vdm - Send Vendor Defined Messages (VDM) to the partner
|
||||
* @adev: Alternate mode handle
|
||||
* @header: VDM Header
|
||||
* @vdo: Array of Vendor Defined Data Objects
|
||||
* @count: Number of Data Objects
|
||||
*
|
||||
* The alternate mode drivers use this function for SVID specific communication
|
||||
* with the partner. The port drivers use it to deliver the Structured VDMs
|
||||
* received from the partners to the alternate mode drivers.
|
||||
*/
|
||||
int typec_altmode_vdm(struct typec_altmode *adev,
|
||||
const u32 header, const u32 *vdo, int count)
|
||||
{
|
||||
struct typec_altmode *pdev;
|
||||
struct altmode *altmode;
|
||||
|
||||
if (!adev)
|
||||
return 0;
|
||||
|
||||
altmode = to_altmode(adev);
|
||||
|
||||
if (!altmode->partner)
|
||||
return -ENODEV;
|
||||
|
||||
pdev = &altmode->partner->adev;
|
||||
|
||||
if (!pdev->ops || !pdev->ops->vdm)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
return pdev->ops->vdm(pdev, header, vdo, count);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_vdm);
|
||||
|
||||
const struct typec_altmode *
|
||||
typec_altmode_get_partner(struct typec_altmode *adev)
|
||||
{
|
||||
return &to_altmode(adev)->partner->adev;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_get_partner);
|
||||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
/* API for the alternate mode drivers */
|
||||
|
||||
/**
|
||||
* typec_altmode_get_plug - Find cable plug alternate mode
|
||||
* @adev: Handle to partner alternate mode
|
||||
* @index: Cable plug index
|
||||
*
|
||||
* Increment reference count for cable plug alternate mode device. Returns
|
||||
* handle to the cable plug alternate mode, or NULL if none is found.
|
||||
*/
|
||||
struct typec_altmode *typec_altmode_get_plug(struct typec_altmode *adev,
|
||||
enum typec_plug_index index)
|
||||
{
|
||||
struct altmode *port = to_altmode(adev)->partner;
|
||||
|
||||
if (port->plug[index]) {
|
||||
get_device(&port->plug[index]->adev.dev);
|
||||
return &port->plug[index]->adev;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_get_plug);
|
||||
|
||||
/**
|
||||
* typec_altmode_put_plug - Decrement cable plug alternate mode reference count
|
||||
* @plug: Handle to the cable plug alternate mode
|
||||
*/
|
||||
void typec_altmode_put_plug(struct typec_altmode *plug)
|
||||
{
|
||||
if (plug)
|
||||
put_device(&plug->dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_put_plug);
|
||||
|
||||
int __typec_altmode_register_driver(struct typec_altmode_driver *drv,
|
||||
struct module *module)
|
||||
{
|
||||
if (!drv->probe)
|
||||
return -EINVAL;
|
||||
|
||||
drv->driver.owner = module;
|
||||
drv->driver.bus = &typec_bus;
|
||||
|
||||
return driver_register(&drv->driver);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__typec_altmode_register_driver);
|
||||
|
||||
void typec_altmode_unregister_driver(struct typec_altmode_driver *drv)
|
||||
{
|
||||
driver_unregister(&drv->driver);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_unregister_driver);
|
||||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
/* API for the port drivers */
|
||||
|
||||
/**
|
||||
* typec_match_altmode - Match SVID to an array of alternate modes
|
||||
* @altmodes: Array of alternate modes
|
||||
* @n: Number of elements in the array, or -1 for NULL termiated arrays
|
||||
* @svid: Standard or Vendor ID to match with
|
||||
*
|
||||
* Return pointer to an alternate mode with SVID mathing @svid, or NULL when no
|
||||
* match is found.
|
||||
*/
|
||||
struct typec_altmode *typec_match_altmode(struct typec_altmode **altmodes,
|
||||
size_t n, u16 svid, u8 mode)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < n; i++) {
|
||||
if (!altmodes[i])
|
||||
break;
|
||||
if (altmodes[i]->svid == svid && altmodes[i]->mode == mode)
|
||||
return altmodes[i];
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_match_altmode);
|
||||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
|
||||
static ssize_t
|
||||
description_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_typec_altmode(dev);
|
||||
|
||||
return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
|
||||
}
|
||||
static DEVICE_ATTR_RO(description);
|
||||
|
||||
static struct attribute *typec_attrs[] = {
|
||||
&dev_attr_description.attr,
|
||||
NULL
|
||||
};
|
||||
ATTRIBUTE_GROUPS(typec);
|
||||
|
||||
static int typec_match(struct device *dev, struct device_driver *driver)
|
||||
{
|
||||
struct typec_altmode_driver *drv = to_altmode_driver(driver);
|
||||
struct typec_altmode *altmode = to_typec_altmode(dev);
|
||||
const struct typec_device_id *id;
|
||||
|
||||
for (id = drv->id_table; id->svid; id++)
|
||||
if (id->svid == altmode->svid &&
|
||||
(id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
|
||||
{
|
||||
struct typec_altmode *altmode = to_typec_altmode(dev);
|
||||
|
||||
if (add_uevent_var(env, "SVID=%04X", altmode->svid))
|
||||
return -ENOMEM;
|
||||
|
||||
if (add_uevent_var(env, "MODE=%u", altmode->mode))
|
||||
return -ENOMEM;
|
||||
|
||||
return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
|
||||
altmode->svid, altmode->mode);
|
||||
}
|
||||
|
||||
static int typec_altmode_create_links(struct altmode *alt)
|
||||
{
|
||||
struct device *port_dev = &alt->partner->adev.dev;
|
||||
struct device *dev = &alt->adev.dev;
|
||||
int err;
|
||||
|
||||
err = sysfs_create_link(&dev->kobj, &port_dev->kobj, "port");
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = sysfs_create_link(&port_dev->kobj, &dev->kobj, "partner");
|
||||
if (err)
|
||||
sysfs_remove_link(&dev->kobj, "port");
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void typec_altmode_remove_links(struct altmode *alt)
|
||||
{
|
||||
sysfs_remove_link(&alt->partner->adev.dev.kobj, "partner");
|
||||
sysfs_remove_link(&alt->adev.dev.kobj, "port");
|
||||
}
|
||||
|
||||
static int typec_probe(struct device *dev)
|
||||
{
|
||||
struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
|
||||
struct typec_altmode *adev = to_typec_altmode(dev);
|
||||
struct altmode *altmode = to_altmode(adev);
|
||||
int ret;
|
||||
|
||||
/* Fail if the port does not support the alternate mode */
|
||||
if (!altmode->partner)
|
||||
return -ENODEV;
|
||||
|
||||
ret = typec_altmode_create_links(altmode);
|
||||
if (ret) {
|
||||
dev_warn(dev, "failed to create symlinks\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = drv->probe(adev);
|
||||
if (ret)
|
||||
typec_altmode_remove_links(altmode);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int typec_remove(struct device *dev)
|
||||
{
|
||||
struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
|
||||
struct typec_altmode *adev = to_typec_altmode(dev);
|
||||
struct altmode *altmode = to_altmode(adev);
|
||||
|
||||
typec_altmode_remove_links(altmode);
|
||||
|
||||
if (drv->remove)
|
||||
drv->remove(to_typec_altmode(dev));
|
||||
|
||||
if (adev->active) {
|
||||
WARN_ON(typec_altmode_set_state(adev, TYPEC_STATE_SAFE));
|
||||
typec_altmode_update_active(adev, false);
|
||||
}
|
||||
|
||||
adev->desc = NULL;
|
||||
adev->ops = NULL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct bus_type typec_bus = {
|
||||
.name = "typec",
|
||||
.dev_groups = typec_groups,
|
||||
.match = typec_match,
|
||||
.uevent = typec_uevent,
|
||||
.probe = typec_probe,
|
||||
.remove = typec_remove,
|
||||
};
|
38
drivers/usb/typec/bus.h
Normal file
38
drivers/usb/typec/bus.h
Normal file
|
@ -0,0 +1,38 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef __USB_TYPEC_ALTMODE_H__
|
||||
#define __USB_TYPEC_ALTMODE_H__
|
||||
|
||||
#include <linux/usb/typec_altmode.h>
|
||||
#include <linux/usb/typec_mux.h>
|
||||
|
||||
struct bus_type;
|
||||
|
||||
struct altmode {
|
||||
unsigned int id;
|
||||
struct typec_altmode adev;
|
||||
struct typec_mux *mux;
|
||||
|
||||
enum typec_port_data roles;
|
||||
|
||||
struct attribute *attrs[5];
|
||||
char group_name[6];
|
||||
struct attribute_group group;
|
||||
const struct attribute_group *groups[2];
|
||||
|
||||
struct altmode *partner;
|
||||
struct altmode *plug[2];
|
||||
|
||||
struct blocking_notifier_head nh;
|
||||
};
|
||||
|
||||
#define to_altmode(d) container_of(d, struct altmode, adev)
|
||||
|
||||
extern struct bus_type typec_bus;
|
||||
extern const struct device_type typec_altmode_dev_type;
|
||||
extern const struct device_type typec_port_dev_type;
|
||||
|
||||
#define is_typec_altmode(_dev_) (_dev_->type == &typec_altmode_dev_type)
|
||||
#define is_typec_port(_dev_) (_dev_->type == &typec_port_dev_type)
|
||||
|
||||
#endif /* __USB_TYPEC_ALTMODE_H__ */
|
|
@ -10,28 +10,13 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/usb/typec.h>
|
||||
#include <linux/usb/typec_mux.h>
|
||||
|
||||
struct typec_altmode {
|
||||
struct device dev;
|
||||
u16 svid;
|
||||
u8 mode;
|
||||
|
||||
u32 vdo;
|
||||
char *desc;
|
||||
enum typec_port_type roles;
|
||||
unsigned int active:1;
|
||||
|
||||
struct attribute *attrs[5];
|
||||
char group_name[6];
|
||||
struct attribute_group group;
|
||||
const struct attribute_group *groups[2];
|
||||
};
|
||||
#include "bus.h"
|
||||
|
||||
struct typec_plug {
|
||||
struct device dev;
|
||||
enum typec_plug_index index;
|
||||
struct ida mode_ids;
|
||||
};
|
||||
|
||||
struct typec_cable {
|
||||
|
@ -46,11 +31,13 @@ struct typec_partner {
|
|||
unsigned int usb_pd:1;
|
||||
struct usb_pd_identity *identity;
|
||||
enum typec_accessory accessory;
|
||||
struct ida mode_ids;
|
||||
};
|
||||
|
||||
struct typec_port {
|
||||
unsigned int id;
|
||||
struct device dev;
|
||||
struct ida mode_ids;
|
||||
|
||||
int prefer_role;
|
||||
enum typec_data_role data_role;
|
||||
|
@ -71,17 +58,14 @@ struct typec_port {
|
|||
#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;
|
||||
|
@ -163,25 +147,148 @@ static void typec_report_identity(struct device *dev)
|
|||
/* ------------------------------------------------------------------------- */
|
||||
/* Alternate Modes */
|
||||
|
||||
static int altmode_match(struct device *dev, void *data)
|
||||
{
|
||||
struct typec_altmode *adev = to_typec_altmode(dev);
|
||||
struct typec_device_id *id = data;
|
||||
|
||||
if (!is_typec_altmode(dev))
|
||||
return 0;
|
||||
|
||||
return ((adev->svid == id->svid) && (adev->mode == id->mode));
|
||||
}
|
||||
|
||||
static void typec_altmode_set_partner(struct altmode *altmode)
|
||||
{
|
||||
struct typec_altmode *adev = &altmode->adev;
|
||||
struct typec_device_id id = { adev->svid, adev->mode, };
|
||||
struct typec_port *port = typec_altmode2port(adev);
|
||||
struct altmode *partner;
|
||||
struct device *dev;
|
||||
|
||||
dev = device_find_child(&port->dev, &id, altmode_match);
|
||||
if (!dev)
|
||||
return;
|
||||
|
||||
/* Bind the port alt mode to the partner/plug alt mode. */
|
||||
partner = to_altmode(to_typec_altmode(dev));
|
||||
altmode->partner = partner;
|
||||
|
||||
/* Bind the partner/plug alt mode to the port alt mode. */
|
||||
if (is_typec_plug(adev->dev.parent)) {
|
||||
struct typec_plug *plug = to_typec_plug(adev->dev.parent);
|
||||
|
||||
partner->plug[plug->index] = altmode;
|
||||
} else {
|
||||
partner->partner = altmode;
|
||||
}
|
||||
}
|
||||
|
||||
static void typec_altmode_put_partner(struct altmode *altmode)
|
||||
{
|
||||
struct altmode *partner = altmode->partner;
|
||||
struct typec_altmode *adev;
|
||||
|
||||
if (!partner)
|
||||
return;
|
||||
|
||||
adev = &partner->adev;
|
||||
|
||||
if (is_typec_plug(adev->dev.parent)) {
|
||||
struct typec_plug *plug = to_typec_plug(adev->dev.parent);
|
||||
|
||||
partner->plug[plug->index] = NULL;
|
||||
} else {
|
||||
partner->partner = NULL;
|
||||
}
|
||||
put_device(&adev->dev);
|
||||
}
|
||||
|
||||
static int __typec_port_match(struct device *dev, const void *name)
|
||||
{
|
||||
return !strcmp((const char *)name, dev_name(dev));
|
||||
}
|
||||
|
||||
static void *typec_port_match(struct device_connection *con, int ep, void *data)
|
||||
{
|
||||
return class_find_device(typec_class, NULL, con->endpoint[ep],
|
||||
__typec_port_match);
|
||||
}
|
||||
|
||||
struct typec_altmode *
|
||||
typec_altmode_register_notifier(struct device *dev, u16 svid, u8 mode,
|
||||
struct notifier_block *nb)
|
||||
{
|
||||
struct typec_device_id id = { svid, mode, };
|
||||
struct device *altmode_dev;
|
||||
struct device *port_dev;
|
||||
struct altmode *altmode;
|
||||
int ret;
|
||||
|
||||
/* Find the port linked to the caller */
|
||||
port_dev = device_connection_find_match(dev, NULL, NULL,
|
||||
typec_port_match);
|
||||
if (IS_ERR_OR_NULL(port_dev))
|
||||
return port_dev ? ERR_CAST(port_dev) : ERR_PTR(-ENODEV);
|
||||
|
||||
/* Find the altmode with matching svid */
|
||||
altmode_dev = device_find_child(port_dev, &id, altmode_match);
|
||||
|
||||
put_device(port_dev);
|
||||
|
||||
if (!altmode_dev)
|
||||
return ERR_PTR(-ENODEV);
|
||||
|
||||
altmode = to_altmode(to_typec_altmode(altmode_dev));
|
||||
|
||||
/* Register notifier */
|
||||
ret = blocking_notifier_chain_register(&altmode->nh, nb);
|
||||
if (ret) {
|
||||
put_device(altmode_dev);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
return &altmode->adev;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_register_notifier);
|
||||
|
||||
void typec_altmode_unregister_notifier(struct typec_altmode *adev,
|
||||
struct notifier_block *nb)
|
||||
{
|
||||
struct altmode *altmode = to_altmode(adev);
|
||||
|
||||
blocking_notifier_chain_unregister(&altmode->nh, nb);
|
||||
put_device(&adev->dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_unregister_notifier);
|
||||
|
||||
/**
|
||||
* typec_altmode_update_active - Report Enter/Exit mode
|
||||
* @alt: Handle to the alternate mode
|
||||
* @adev: Handle to the alternate mode
|
||||
* @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, bool active)
|
||||
void typec_altmode_update_active(struct typec_altmode *adev, bool active)
|
||||
{
|
||||
char dir[6];
|
||||
|
||||
if (alt->active == active)
|
||||
if (adev->active == active)
|
||||
return;
|
||||
|
||||
alt->active = active;
|
||||
snprintf(dir, sizeof(dir), "mode%d", alt->mode);
|
||||
sysfs_notify(&alt->dev.kobj, dir, "active");
|
||||
kobject_uevent(&alt->dev.kobj, KOBJ_CHANGE);
|
||||
if (!is_typec_port(adev->dev.parent)) {
|
||||
if (!active)
|
||||
module_put(adev->dev.driver->owner);
|
||||
else
|
||||
WARN_ON(!try_module_get(adev->dev.driver->owner));
|
||||
}
|
||||
|
||||
adev->active = active;
|
||||
snprintf(dir, sizeof(dir), "mode%d", adev->mode);
|
||||
sysfs_notify(&adev->dev.kobj, dir, "active");
|
||||
sysfs_notify(&adev->dev.kobj, NULL, "active");
|
||||
kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_altmode_update_active);
|
||||
|
||||
|
@ -208,7 +315,7 @@ EXPORT_SYMBOL_GPL(typec_altmode2port);
|
|||
static ssize_t
|
||||
vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct typec_altmode *alt = to_typec_altmode(dev);
|
||||
|
||||
return sprintf(buf, "0x%08x\n", alt->vdo);
|
||||
}
|
||||
|
@ -217,7 +324,7 @@ static DEVICE_ATTR_RO(vdo);
|
|||
static ssize_t
|
||||
description_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct typec_altmode *alt = to_typec_altmode(dev);
|
||||
|
||||
return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
|
||||
}
|
||||
|
@ -226,7 +333,7 @@ static DEVICE_ATTR_RO(description);
|
|||
static ssize_t
|
||||
active_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct typec_altmode *alt = to_typec_altmode(dev);
|
||||
|
||||
return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
|
||||
}
|
||||
|
@ -234,21 +341,37 @@ active_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|||
static ssize_t active_store(struct device *dev, struct device_attribute *attr,
|
||||
const char *buf, size_t size)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct typec_port *port = typec_altmode2port(alt);
|
||||
bool activate;
|
||||
struct typec_altmode *adev = to_typec_altmode(dev);
|
||||
struct altmode *altmode = to_altmode(adev);
|
||||
bool enter;
|
||||
int ret;
|
||||
|
||||
if (!port->cap->activate_mode)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
ret = kstrtobool(buf, &activate);
|
||||
ret = kstrtobool(buf, &enter);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = port->cap->activate_mode(port->cap, alt->mode, activate);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (adev->active == enter)
|
||||
return size;
|
||||
|
||||
if (is_typec_port(adev->dev.parent)) {
|
||||
typec_altmode_update_active(adev, enter);
|
||||
|
||||
/* Make sure that the partner exits the mode before disabling */
|
||||
if (altmode->partner && !enter && altmode->partner->adev.active)
|
||||
typec_altmode_exit(&altmode->partner->adev);
|
||||
} else if (altmode->partner) {
|
||||
if (enter && !altmode->partner->adev.active) {
|
||||
dev_warn(dev, "port has the mode disabled\n");
|
||||
return -EPERM;
|
||||
}
|
||||
}
|
||||
|
||||
/* Note: If there is no driver, the mode will not be entered */
|
||||
if (adev->ops && adev->ops->activate) {
|
||||
ret = adev->ops->activate(adev, enter);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return size;
|
||||
}
|
||||
|
@ -258,7 +381,7 @@ static ssize_t
|
|||
supported_roles_show(struct device *dev, struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct altmode *alt = to_altmode(to_typec_altmode(dev));
|
||||
ssize_t ret;
|
||||
|
||||
switch (alt->roles) {
|
||||
|
@ -277,29 +400,72 @@ supported_roles_show(struct device *dev, struct device_attribute *attr,
|
|||
}
|
||||
static DEVICE_ATTR_RO(supported_roles);
|
||||
|
||||
static void typec_altmode_release(struct device *dev)
|
||||
static ssize_t
|
||||
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct typec_altmode *adev = to_typec_altmode(dev);
|
||||
|
||||
kfree(alt);
|
||||
return sprintf(buf, "%u\n", adev->mode);
|
||||
}
|
||||
static DEVICE_ATTR_RO(mode);
|
||||
|
||||
static ssize_t svid_show(struct device *dev, struct device_attribute *attr,
|
||||
char *buf)
|
||||
static ssize_t
|
||||
svid_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct typec_altmode *alt = to_altmode(dev);
|
||||
struct typec_altmode *adev = to_typec_altmode(dev);
|
||||
|
||||
return sprintf(buf, "%04x\n", alt->svid);
|
||||
return sprintf(buf, "%04x\n", adev->svid);
|
||||
}
|
||||
static DEVICE_ATTR_RO(svid);
|
||||
|
||||
static struct attribute *typec_altmode_attrs[] = {
|
||||
&dev_attr_active.attr,
|
||||
&dev_attr_mode.attr,
|
||||
&dev_attr_svid.attr,
|
||||
&dev_attr_vdo.attr,
|
||||
NULL
|
||||
};
|
||||
ATTRIBUTE_GROUPS(typec_altmode);
|
||||
|
||||
static const struct device_type typec_altmode_dev_type = {
|
||||
static int altmode_id_get(struct device *dev)
|
||||
{
|
||||
struct ida *ids;
|
||||
|
||||
if (is_typec_partner(dev))
|
||||
ids = &to_typec_partner(dev)->mode_ids;
|
||||
else if (is_typec_plug(dev))
|
||||
ids = &to_typec_plug(dev)->mode_ids;
|
||||
else
|
||||
ids = &to_typec_port(dev)->mode_ids;
|
||||
|
||||
return ida_simple_get(ids, 0, 0, GFP_KERNEL);
|
||||
}
|
||||
|
||||
static void altmode_id_remove(struct device *dev, int id)
|
||||
{
|
||||
struct ida *ids;
|
||||
|
||||
if (is_typec_partner(dev))
|
||||
ids = &to_typec_partner(dev)->mode_ids;
|
||||
else if (is_typec_plug(dev))
|
||||
ids = &to_typec_plug(dev)->mode_ids;
|
||||
else
|
||||
ids = &to_typec_port(dev)->mode_ids;
|
||||
|
||||
ida_simple_remove(ids, id);
|
||||
}
|
||||
|
||||
static void typec_altmode_release(struct device *dev)
|
||||
{
|
||||
struct altmode *alt = to_altmode(to_typec_altmode(dev));
|
||||
|
||||
typec_altmode_put_partner(alt);
|
||||
|
||||
altmode_id_remove(alt->adev.dev.parent, alt->id);
|
||||
kfree(alt);
|
||||
}
|
||||
|
||||
const struct device_type typec_altmode_dev_type = {
|
||||
.name = "typec_alternate_mode",
|
||||
.groups = typec_altmode_groups,
|
||||
.release = typec_altmode_release,
|
||||
|
@ -309,58 +475,74 @@ static struct typec_altmode *
|
|||
typec_register_altmode(struct device *parent,
|
||||
const struct typec_altmode_desc *desc)
|
||||
{
|
||||
struct typec_altmode *alt;
|
||||
unsigned int id = altmode_id_get(parent);
|
||||
bool is_port = is_typec_port(parent);
|
||||
struct altmode *alt;
|
||||
int ret;
|
||||
|
||||
alt = kzalloc(sizeof(*alt), GFP_KERNEL);
|
||||
if (!alt)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
alt->svid = desc->svid;
|
||||
alt->mode = desc->mode;
|
||||
alt->vdo = desc->vdo;
|
||||
alt->adev.svid = desc->svid;
|
||||
alt->adev.mode = desc->mode;
|
||||
alt->adev.vdo = desc->vdo;
|
||||
alt->roles = desc->roles;
|
||||
alt->id = id;
|
||||
|
||||
alt->attrs[0] = &dev_attr_vdo.attr;
|
||||
alt->attrs[1] = &dev_attr_description.attr;
|
||||
alt->attrs[2] = &dev_attr_active.attr;
|
||||
|
||||
if (is_typec_port(parent))
|
||||
if (is_port) {
|
||||
alt->attrs[3] = &dev_attr_supported_roles.attr;
|
||||
alt->adev.active = true; /* Enabled by default */
|
||||
}
|
||||
|
||||
sprintf(alt->group_name, "mode%d", desc->mode);
|
||||
alt->group.name = alt->group_name;
|
||||
alt->group.attrs = alt->attrs;
|
||||
alt->groups[0] = &alt->group;
|
||||
|
||||
alt->dev.parent = parent;
|
||||
alt->dev.groups = alt->groups;
|
||||
alt->dev.type = &typec_altmode_dev_type;
|
||||
dev_set_name(&alt->dev, "%s-%04x:%u", dev_name(parent),
|
||||
alt->svid, alt->mode);
|
||||
alt->adev.dev.parent = parent;
|
||||
alt->adev.dev.groups = alt->groups;
|
||||
alt->adev.dev.type = &typec_altmode_dev_type;
|
||||
dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
|
||||
|
||||
ret = device_register(&alt->dev);
|
||||
/* Link partners and plugs with the ports */
|
||||
if (is_port)
|
||||
BLOCKING_INIT_NOTIFIER_HEAD(&alt->nh);
|
||||
else
|
||||
typec_altmode_set_partner(alt);
|
||||
|
||||
/* The partners are bind to drivers */
|
||||
if (is_typec_partner(parent))
|
||||
alt->adev.dev.bus = &typec_bus;
|
||||
|
||||
ret = device_register(&alt->adev.dev);
|
||||
if (ret) {
|
||||
dev_err(parent, "failed to register alternate mode (%d)\n",
|
||||
ret);
|
||||
put_device(&alt->dev);
|
||||
put_device(&alt->adev.dev);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
return alt;
|
||||
return &alt->adev;
|
||||
}
|
||||
|
||||
/**
|
||||
* typec_unregister_altmode - Unregister Alternate Mode
|
||||
* @alt: The alternate mode to be unregistered
|
||||
* @adev: 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)
|
||||
void typec_unregister_altmode(struct typec_altmode *adev)
|
||||
{
|
||||
if (!IS_ERR_OR_NULL(alt))
|
||||
device_unregister(&alt->dev);
|
||||
if (IS_ERR_OR_NULL(adev))
|
||||
return;
|
||||
typec_mux_put(to_altmode(adev)->mux);
|
||||
device_unregister(&adev->dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_unregister_altmode);
|
||||
|
||||
|
@ -398,6 +580,7 @@ static void typec_partner_release(struct device *dev)
|
|||
{
|
||||
struct typec_partner *partner = to_typec_partner(dev);
|
||||
|
||||
ida_destroy(&partner->mode_ids);
|
||||
kfree(partner);
|
||||
}
|
||||
|
||||
|
@ -463,6 +646,7 @@ struct typec_partner *typec_register_partner(struct typec_port *port,
|
|||
if (!partner)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
ida_init(&partner->mode_ids);
|
||||
partner->usb_pd = desc->usb_pd;
|
||||
partner->accessory = desc->accessory;
|
||||
|
||||
|
@ -511,6 +695,7 @@ static void typec_plug_release(struct device *dev)
|
|||
{
|
||||
struct typec_plug *plug = to_typec_plug(dev);
|
||||
|
||||
ida_destroy(&plug->mode_ids);
|
||||
kfree(plug);
|
||||
}
|
||||
|
||||
|
@ -563,6 +748,7 @@ struct typec_plug *typec_register_plug(struct typec_cable *cable,
|
|||
|
||||
sprintf(name, "plug%d", desc->index);
|
||||
|
||||
ida_init(&plug->mode_ids);
|
||||
plug->index = desc->index;
|
||||
plug->dev.class = typec_class;
|
||||
plug->dev.parent = &cable->dev;
|
||||
|
@ -1083,12 +1269,13 @@ static void typec_release(struct device *dev)
|
|||
struct typec_port *port = to_typec_port(dev);
|
||||
|
||||
ida_simple_remove(&typec_index_ida, port->id);
|
||||
ida_destroy(&port->mode_ids);
|
||||
typec_switch_put(port->sw);
|
||||
typec_mux_put(port->mux);
|
||||
kfree(port);
|
||||
}
|
||||
|
||||
static const struct device_type typec_port_dev_type = {
|
||||
const struct device_type typec_port_dev_type = {
|
||||
.name = "typec_port",
|
||||
.groups = typec_groups,
|
||||
.uevent = typec_uevent,
|
||||
|
@ -1279,11 +1466,11 @@ EXPORT_SYMBOL_GPL(typec_get_orientation);
|
|||
|
||||
/**
|
||||
* typec_set_mode - Set mode of operation for USB Type-C connector
|
||||
* @port: USB Type-C port for the connector
|
||||
* @mode: Operation mode for the connector
|
||||
* @port: USB Type-C connector
|
||||
* @mode: Accessory Mode, USB Operation or Safe State
|
||||
*
|
||||
* Set mode @mode for @port. This function will configure the muxes needed to
|
||||
* enter @mode.
|
||||
* Configure @port for Accessory Mode @mode. This function will configure the
|
||||
* muxes needed for @mode.
|
||||
*/
|
||||
int typec_set_mode(struct typec_port *port, int mode)
|
||||
{
|
||||
|
@ -1297,6 +1484,7 @@ EXPORT_SYMBOL_GPL(typec_set_mode);
|
|||
* 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
|
||||
* @drvdata: Private pointer to driver specific info
|
||||
*
|
||||
* This routine is used to register an alternate mode that @port is capable of
|
||||
* supporting.
|
||||
|
@ -1307,7 +1495,23 @@ struct typec_altmode *
|
|||
typec_port_register_altmode(struct typec_port *port,
|
||||
const struct typec_altmode_desc *desc)
|
||||
{
|
||||
return typec_register_altmode(&port->dev, desc);
|
||||
struct typec_altmode *adev;
|
||||
struct typec_mux *mux;
|
||||
char id[10];
|
||||
|
||||
sprintf(id, "id%04xm%02x", desc->svid, desc->mode);
|
||||
|
||||
mux = typec_mux_get(port->dev.parent, id);
|
||||
if (IS_ERR(mux))
|
||||
return ERR_CAST(mux);
|
||||
|
||||
adev = typec_register_altmode(&port->dev, desc);
|
||||
if (IS_ERR(adev))
|
||||
typec_mux_put(mux);
|
||||
else
|
||||
to_altmode(adev)->mux = mux;
|
||||
|
||||
return adev;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(typec_port_register_altmode);
|
||||
|
||||
|
@ -1381,10 +1585,12 @@ struct typec_port *typec_register_port(struct device *parent,
|
|||
break;
|
||||
}
|
||||
|
||||
ida_init(&port->mode_ids);
|
||||
mutex_init(&port->port_type_lock);
|
||||
|
||||
port->id = id;
|
||||
port->cap = cap;
|
||||
port->port_type = cap->type;
|
||||
mutex_init(&port->port_type_lock);
|
||||
port->prefer_role = cap->prefer_role;
|
||||
|
||||
port->dev.class = typec_class;
|
||||
|
@ -1428,8 +1634,19 @@ EXPORT_SYMBOL_GPL(typec_unregister_port);
|
|||
|
||||
static int __init typec_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = bus_register(&typec_bus);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
typec_class = class_create(THIS_MODULE, "typec");
|
||||
return PTR_ERR_OR_ZERO(typec_class);
|
||||
if (IS_ERR(typec_class)) {
|
||||
bus_unregister(&typec_bus);
|
||||
return PTR_ERR(typec_class);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(typec_init);
|
||||
|
||||
|
@ -1437,6 +1654,7 @@ static void __exit typec_exit(void)
|
|||
{
|
||||
class_destroy(typec_class);
|
||||
ida_destroy(&typec_index_ida);
|
||||
bus_unregister(&typec_bus);
|
||||
}
|
||||
module_exit(typec_exit);
|
||||
|
||||
|
|
|
@ -746,4 +746,19 @@ struct tb_service_id {
|
|||
#define TBSVC_MATCH_PROTOCOL_VERSION 0x0004
|
||||
#define TBSVC_MATCH_PROTOCOL_REVISION 0x0008
|
||||
|
||||
/* USB Type-C Alternate Modes */
|
||||
|
||||
#define TYPEC_ANY_MODE 0x7
|
||||
|
||||
/**
|
||||
* struct typec_device_id - USB Type-C alternate mode identifiers
|
||||
* @svid: Standard or Vendor ID
|
||||
* @mode: Mode index
|
||||
*/
|
||||
struct typec_device_id {
|
||||
__u16 svid;
|
||||
__u8 mode;
|
||||
kernel_ulong_t driver_data;
|
||||
};
|
||||
|
||||
#endif /* LINUX_MOD_DEVICETABLE_H */
|
||||
|
|
|
@ -5,21 +5,18 @@
|
|||
|
||||
#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;
|
||||
struct device;
|
||||
|
||||
enum typec_port_type {
|
||||
TYPEC_PORT_SRC,
|
||||
|
@ -107,7 +104,7 @@ struct typec_altmode_desc {
|
|||
u8 mode;
|
||||
u32 vdo;
|
||||
/* Only used with ports */
|
||||
enum typec_port_type roles;
|
||||
enum typec_port_data roles;
|
||||
};
|
||||
|
||||
struct typec_altmode
|
||||
|
@ -186,7 +183,6 @@ struct typec_partner_desc {
|
|||
* @dr_set: Set Data Role
|
||||
* @pr_set: Set Power Role
|
||||
* @vconn_set: Set VCONN Role
|
||||
* @activate_mode: Enter/exit given Alternate Mode
|
||||
* @port_type_set: Set port type
|
||||
*
|
||||
* Static capabilities of a single USB Type-C port.
|
||||
|
@ -212,12 +208,8 @@ 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);
|
||||
int (*port_type_set)(const struct typec_capability *,
|
||||
enum typec_port_type);
|
||||
|
||||
enum typec_port_type);
|
||||
};
|
||||
|
||||
/* Specific to try_role(). Indicates the user want's to clear the preference. */
|
||||
|
|
160
include/linux/usb/typec_altmode.h
Normal file
160
include/linux/usb/typec_altmode.h
Normal file
|
@ -0,0 +1,160 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef __USB_TYPEC_ALTMODE_H
|
||||
#define __USB_TYPEC_ALTMODE_H
|
||||
|
||||
#include <linux/mod_devicetable.h>
|
||||
#include <linux/usb/typec.h>
|
||||
#include <linux/device.h>
|
||||
|
||||
#define MODE_DISCOVERY_MAX 6
|
||||
|
||||
struct typec_altmode_ops;
|
||||
|
||||
/**
|
||||
* struct typec_altmode - USB Type-C alternate mode device
|
||||
* @dev: Driver model's view of this device
|
||||
* @svid: Standard or Vendor ID (SVID) of the alternate mode
|
||||
* @mode: Index of the Mode
|
||||
* @vdo: VDO returned by Discover Modes USB PD command
|
||||
* @active: Tells has the mode been entered or not
|
||||
* @desc: Optional human readable description of the mode
|
||||
* @ops: Operations vector from the driver
|
||||
*/
|
||||
struct typec_altmode {
|
||||
struct device dev;
|
||||
u16 svid;
|
||||
int mode;
|
||||
u32 vdo;
|
||||
unsigned int active:1;
|
||||
|
||||
char *desc;
|
||||
const struct typec_altmode_ops *ops;
|
||||
};
|
||||
|
||||
#define to_typec_altmode(d) container_of(d, struct typec_altmode, dev)
|
||||
|
||||
static inline void typec_altmode_set_drvdata(struct typec_altmode *altmode,
|
||||
void *data)
|
||||
{
|
||||
dev_set_drvdata(&altmode->dev, data);
|
||||
}
|
||||
|
||||
static inline void *typec_altmode_get_drvdata(struct typec_altmode *altmode)
|
||||
{
|
||||
return dev_get_drvdata(&altmode->dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* struct typec_altmode_ops - Alternate mode specific operations vector
|
||||
* @enter: Operations to be executed with Enter Mode Command
|
||||
* @exit: Operations to be executed with Exit Mode Command
|
||||
* @attention: Callback for Attention Command
|
||||
* @vdm: Callback for SVID specific commands
|
||||
* @notify: Communication channel for platform and the alternate mode
|
||||
* @activate: User callback for Enter/Exit Mode
|
||||
*/
|
||||
struct typec_altmode_ops {
|
||||
int (*enter)(struct typec_altmode *altmode);
|
||||
int (*exit)(struct typec_altmode *altmode);
|
||||
void (*attention)(struct typec_altmode *altmode, u32 vdo);
|
||||
int (*vdm)(struct typec_altmode *altmode, const u32 hdr,
|
||||
const u32 *vdo, int cnt);
|
||||
int (*notify)(struct typec_altmode *altmode, unsigned long conf,
|
||||
void *data);
|
||||
int (*activate)(struct typec_altmode *altmode, int activate);
|
||||
};
|
||||
|
||||
int typec_altmode_enter(struct typec_altmode *altmode);
|
||||
int typec_altmode_exit(struct typec_altmode *altmode);
|
||||
void typec_altmode_attention(struct typec_altmode *altmode, u32 vdo);
|
||||
int typec_altmode_vdm(struct typec_altmode *altmode,
|
||||
const u32 header, const u32 *vdo, int count);
|
||||
int typec_altmode_notify(struct typec_altmode *altmode, unsigned long conf,
|
||||
void *data);
|
||||
const struct typec_altmode *
|
||||
typec_altmode_get_partner(struct typec_altmode *altmode);
|
||||
|
||||
/*
|
||||
* These are the connector states (USB, Safe and Alt Mode) defined in USB Type-C
|
||||
* Specification. SVID specific connector states are expected to follow and
|
||||
* start from the value TYPEC_STATE_MODAL.
|
||||
*/
|
||||
enum {
|
||||
TYPEC_STATE_SAFE, /* USB Safe State */
|
||||
TYPEC_STATE_USB, /* USB Operation */
|
||||
TYPEC_STATE_MODAL, /* Alternate Modes */
|
||||
};
|
||||
|
||||
/*
|
||||
* For the muxes there is no difference between Accessory Modes and Alternate
|
||||
* Modes, so the Accessory Modes are supplied with specific modal state values
|
||||
* here. Unlike with Alternate Modes, where the mux will be linked with the
|
||||
* alternate mode device, the mux for Accessory Modes will be linked with the
|
||||
* port device instead.
|
||||
*
|
||||
* Port drivers can use TYPEC_MODE_AUDIO and TYPEC_MODE_DEBUG as the mode
|
||||
* value for typec_set_mode() when accessory modes are supported.
|
||||
*/
|
||||
enum {
|
||||
TYPEC_MODE_AUDIO = TYPEC_STATE_MODAL, /* Audio Accessory */
|
||||
TYPEC_MODE_DEBUG, /* Debug Accessory */
|
||||
};
|
||||
|
||||
#define TYPEC_MODAL_STATE(_state_) ((_state_) + TYPEC_STATE_MODAL)
|
||||
|
||||
struct typec_altmode *typec_altmode_get_plug(struct typec_altmode *altmode,
|
||||
enum typec_plug_index index);
|
||||
void typec_altmode_put_plug(struct typec_altmode *plug);
|
||||
|
||||
struct typec_altmode *typec_match_altmode(struct typec_altmode **altmodes,
|
||||
size_t n, u16 svid, u8 mode);
|
||||
|
||||
struct typec_altmode *
|
||||
typec_altmode_register_notifier(struct device *dev, u16 svid, u8 mode,
|
||||
struct notifier_block *nb);
|
||||
|
||||
void typec_altmode_unregister_notifier(struct typec_altmode *adev,
|
||||
struct notifier_block *nb);
|
||||
|
||||
/**
|
||||
* typec_altmode_get_orientation - Get cable plug orientation
|
||||
* altmode: Handle to the alternate mode
|
||||
*/
|
||||
static inline enum typec_orientation
|
||||
typec_altmode_get_orientation(struct typec_altmode *altmode)
|
||||
{
|
||||
return typec_get_orientation(typec_altmode2port(altmode));
|
||||
}
|
||||
|
||||
/**
|
||||
* struct typec_altmode_driver - USB Type-C alternate mode device driver
|
||||
* @id_table: Null terminated array of SVIDs
|
||||
* @probe: Callback for device binding
|
||||
* @remove: Callback for device unbinding
|
||||
* @driver: Device driver model driver
|
||||
*
|
||||
* These drivers will be bind to the partner alternate mode devices. They will
|
||||
* handle all SVID specific communication.
|
||||
*/
|
||||
struct typec_altmode_driver {
|
||||
const struct typec_device_id *id_table;
|
||||
int (*probe)(struct typec_altmode *altmode);
|
||||
void (*remove)(struct typec_altmode *altmode);
|
||||
struct device_driver driver;
|
||||
};
|
||||
|
||||
#define to_altmode_driver(d) container_of(d, struct typec_altmode_driver, \
|
||||
driver)
|
||||
|
||||
#define typec_altmode_register_driver(drv) \
|
||||
__typec_altmode_register_driver(drv, THIS_MODULE)
|
||||
int __typec_altmode_register_driver(struct typec_altmode_driver *drv,
|
||||
struct module *module);
|
||||
void typec_altmode_unregister_driver(struct typec_altmode_driver *drv);
|
||||
|
||||
#define module_typec_altmode_driver(__typec_altmode_driver) \
|
||||
module_driver(__typec_altmode_driver, typec_altmode_register_driver, \
|
||||
typec_altmode_unregister_driver)
|
||||
|
||||
#endif /* __USB_TYPEC_ALTMODE_H */
|
|
@ -221,5 +221,9 @@ int main(void)
|
|||
DEVID_FIELD(tb_service_id, protocol_version);
|
||||
DEVID_FIELD(tb_service_id, protocol_revision);
|
||||
|
||||
DEVID(typec_device_id);
|
||||
DEVID_FIELD(typec_device_id, svid);
|
||||
DEVID_FIELD(typec_device_id, mode);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
@ -1352,6 +1352,19 @@ static int do_tbsvc_entry(const char *filename, void *symval, char *alias)
|
|||
}
|
||||
ADD_TO_DEVTABLE("tbsvc", tb_service_id, do_tbsvc_entry);
|
||||
|
||||
/* Looks like: typec:idNmN */
|
||||
static int do_typec_entry(const char *filename, void *symval, char *alias)
|
||||
{
|
||||
DEF_FIELD(symval, typec_device_id, svid);
|
||||
DEF_FIELD(symval, typec_device_id, mode);
|
||||
|
||||
sprintf(alias, "typec:id%04X", svid);
|
||||
ADD(alias, "m", mode != TYPEC_ANY_MODE, mode);
|
||||
|
||||
return 1;
|
||||
}
|
||||
ADD_TO_DEVTABLE("typec", typec_device_id, do_typec_entry);
|
||||
|
||||
/* Does namelen bytes of name exactly match the symbol? */
|
||||
static bool sym_is(const char *name, unsigned namelen, const char *symbol)
|
||||
{
|
||||
|
|
Loading…
Reference in a new issue