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Subject[RFC PATCH v3 3/5] usb: typec: Bus type for alternate modes
Date
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>
---
Documentation/ABI/obsolete/sysfs-class-typec | 48 +++
Documentation/ABI/testing/sysfs-bus-typec | 51 +++
Documentation/ABI/testing/sysfs-class-typec | 62 +--
Documentation/driver-api/usb/typec_bus.rst | 136 ++++++
drivers/usb/typec/Makefile | 2 +-
drivers/usb/typec/bus.c | 423 +++++++++++++++++++
drivers/usb/typec/bus.h | 38 ++
drivers/usb/typec/class.c | 364 ++++++++++++----
include/linux/mod_devicetable.h | 15 +
include/linux/usb/typec.h | 14 +-
include/linux/usb/typec_altmode.h | 142 +++++++
scripts/mod/devicetable-offsets.c | 4 +
scripts/mod/file2alias.c | 13 +
13 files changed, 1168 insertions(+), 144 deletions(-)
create mode 100644 Documentation/ABI/obsolete/sysfs-class-typec
create mode 100644 Documentation/ABI/testing/sysfs-bus-typec
create mode 100644 Documentation/driver-api/usb/typec_bus.rst
create mode 100644 drivers/usb/typec/bus.c
create mode 100644 drivers/usb/typec/bus.h
create mode 100644 include/linux/usb/typec_altmode.h

diff --git a/Documentation/ABI/obsolete/sysfs-class-typec b/Documentation/ABI/obsolete/sysfs-class-typec
new file mode 100644
index 000000000000..32623514ee87
--- /dev/null
+++ b/Documentation/ABI/obsolete/sysfs-class-typec
@@ -0,0 +1,48 @@
+These files are deprecated and will be removed. The same files are available
+under /sys/bus/typec (see Documentation/ABI/testing/sysfs-bus-typec).
+
+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
diff --git a/Documentation/ABI/testing/sysfs-bus-typec b/Documentation/ABI/testing/sysfs-bus-typec
new file mode 100644
index 000000000000..ead63f97d9a2
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-typec
@@ -0,0 +1,51 @@
+What: /sys/bus/typec/devices/.../active
+Date: April 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: April 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: April 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: April 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: April 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 5be552e255e9..d7647b258c3c 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
diff --git a/Documentation/driver-api/usb/typec_bus.rst b/Documentation/driver-api/usb/typec_bus.rst
new file mode 100644
index 000000000000..4184e0925567
--- /dev/null
+++ b/Documentation/driver-api/usb/typec_bus.rst
@@ -0,0 +1,136 @@
+
+API for USB Type-C Alternate Mode drivers
+=========================================
+
+Introduction
+------------
+
+Alternate modes require communication with the partner using Vendor Defined
+Messages (VDM) as defined in USB Type-C and USB Power Delivery Specifications.
+The communication is SVID (Standard or Vendor ID) specific, i.e. specific for
+every alternate mode, so every alternate mode will need custom driver.
+
+USB Type-C bus allows binding a driver to the discovered partner alternate
+modes by using the SVID and the mode number.
+
+USB Type-C Connector Class provides a device for every alternate mode a port
+supports, and separate device for every alternate mode the partner supports.
+The drivers for the alternate modes are bind to the partner alternate mode
+devices, and the port alternate mode devices must be handled by the port
+drivers.
+
+When a new partner alternate mode device is registered, it is linked to the
+alternate mode device of the port that the partner is attached to, that has
+matching SVID and mode. Communication between the port driver and alternate mode
+driver will happen using the same API.
+
+The port alternate mode devices are used as a proxy between the partner and the
+alternate mode drivers, so the port drivers are only expected to pass the SVID
+specific commands from the alternate mode drivers to the partner, and from the
+partners to the alternate mode drivers. No direct SVID specific communication is
+needed from the port drivers, but the port drivers need to provide the operation
+callbacks for the port alternate mode devices, just like the alternate mode
+drivers need to provide them for the partner alternate mode devices.
+
+Usage:
+------
+
+General
+~~~~~~~
+
+By default, the alternate mode drivers are responsible for entering the mode.
+It is also possible to leave the decision about entering the mode to the user
+space (See Documentation/ABI/testing/sysfs-class-typec). Port drivers should not
+enter any modes on their own.
+
+``->vdm`` is the most important callback in the vector. It will be used to
+deliver all the SVID specific commands from the partner to the alternate mode
+driver, and vise versa in case of port drivers. The drivers send the SVID
+specific commands to each other using :c:func:`typec_altmode_vmd()`.
+
+If the communication with the partner using the SVID specific commands results
+in need to re-configure the pins on the connector, the alternate mode driver
+needs to notify the bus using :c:func:`typec_altmode_notify()`. The driver
+passes the negotiated SVID specific pin configuration value to the function as
+parameter. The bus driver will then configure the mux behind the connector using
+that value as the state value for the mux, and also call blocking notification
+chain to notify the external drivers about the state of the connector that need
+to know it.
+
+NOTE: The SVID specific pin configuration values must always start from
+``TYPEC_STATE_MODAL``. USB Type-C specification defines two default states for
+the connector: ``TYPEC_STATE_USB`` and ``TYPEC_STATE_SAFE``. These values are
+reserved by the bus as the first possible values for the state. When the
+alternate mode is entered, the bus will put the connector into
+``TYPEC_STATE_SAFE`` before sending Enter or Exit Mode command as defined in USB
+Type-C Specification, and also put the connector back to ``TYPEC_STATE_USB``
+after the mode has been exited.
+
+An example of working definitions for SVID specific pin configurations would
+look like this:
+
+enum {
+ ALTMODEX_CONF_A = TYPEC_STATE_MODAL,
+ ALTMODEX_CONF_B,
+ ...
+};
+
+Helper macro ``TYPEC_MODAL_STATE()`` can also be used:
+
+#define ALTMODEX_CONF_A = TYPEC_MODAL_STATE(0);
+#define ALTMODEX_CONF_B = TYPEC_MODAL_STATE(1);
+
+Notification chain
+~~~~~~~~~~~~~~~~~~
+
+The drivers for the components that the alternate modes are designed for need to
+get details regarding the results of the negotiation with the partner, and the
+pin configuration of the connector. In case of DisplayPort alternate mode for
+example, the GPU drivers will need to know those details. In case of
+Thunderbolt alternate mode, the thunderbolt drivers will need to know them, and
+so on.
+
+The notification chain is designed for this purpose. The drivers can register
+notifiers with :c:func:`typec_altmode_register_notifier()`.
+
+Cable plug alternate modes
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The alternate mode drivers are not bind to cable plug alternate mode devices,
+only to the partner alternate mode devices. If the alternate mode supports, or
+requires, a cable that responds to SOP Prime, and optionally SOP Double Prime
+messages, the driver for that alternate mode must request handle to the cable
+plug alternate modes using :c:func:`typec_altmode_get_plug()`, and taking over
+their control.
+
+Driver API
+----------
+
+Alternate mode driver registering/unregistering
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_altmode_register_driver typec_altmode_unregister_driver
+
+Alternate mode driver operations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_altmode_enter typec_altmode_exit typec_altmode_attention typec_altmode_vdm typec_altmode_notify
+
+API for the port drivers
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_match_altmode
+
+Cable Plug operations
+~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_altmode_get_plug typec_altmode_put_plug
+
+Notifications
+~~~~~~~~~~~~~
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_altmode_register_notifier typec_altmode_unregister_notifier
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index 1f599a6c30cc..5466c62c8e97 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_TYPEC) += typec.o
-typec-y := class.o mux.o
+typec-y := class.o mux.o bus.o
obj-$(CONFIG_TYPEC_TCPM) += tcpm.o
obj-y += fusb302/
obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o
diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
new file mode 100644
index 000000000000..126db428cddb
--- /dev/null
+++ b/drivers/usb/typec/bus.c
@@ -0,0 +1,423 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * Bus for USB Type-C Alternate Modes
+ *
+ * Copyright (C) 2018 Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ */
+
+#include <linux/usb/pd_vdo.h>
+
+#include "bus.h"
+
+static inline int typec_altmode_set_mux(struct altmode *alt, u8 state)
+{
+ return alt->mux ? alt->mux->set(alt->mux, state) : 0;
+}
+
+static int typec_altmode_set_state(struct typec_altmode *adev, int state)
+{
+ bool is_port = is_typec_port(adev->dev.parent);
+ struct altmode *port_altmode;
+ int ret;
+
+ port_altmode = is_port ? to_altmode(adev) : to_altmode(adev)->partner;
+
+ ret = typec_altmode_set_mux(port_altmode, state);
+ if (ret)
+ return ret;
+
+ blocking_notifier_call_chain(&port_altmode->nh, state, NULL);
+
+ return 0;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Common API */
+
+/**
+ * typec_altmode_notify - Communication between the OS and alternate mode driver
+ * @adev: Handle to the alternate mode
+ * @conf: Alternate mode specific configuration value
+ * @data: Alternate mode specific data
+ *
+ * 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
+ * information will then be used for example to configure the muxes.
+ * Communication to the other direction is also possible, and low level device
+ * drivers can also send notifications to the alternate mode drivers. The actual
+ * communication will be specific for every SVID.
+ */
+int typec_altmode_notify(struct typec_altmode *adev,
+ unsigned long conf, void *data)
+{
+ bool is_port = is_typec_port(adev->dev.parent);
+ struct altmode *altmode;
+ struct altmode *partner;
+ int ret;
+
+ if (!adev)
+ return 0;
+
+ altmode = to_altmode(adev);
+
+ if (!altmode->partner)
+ return -ENODEV;
+
+ partner = altmode->partner;
+
+ ret = typec_altmode_set_mux(is_port ? altmode : partner, (u8)conf);
+ if (ret)
+ return ret;
+
+ blocking_notifier_call_chain(is_port ? &altmode->nh : &partner->nh,
+ conf, data);
+
+ if (partner->adev.ops && partner->adev.ops->notify)
+ return partner->adev.ops->notify(&partner->adev, conf, data);
+
+ 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;
+
+ /* Moving to USB Safe State */
+ ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
+ if (ret)
+ return ret;
+
+ /* Enter Mode */
+ if (pdev->ops && pdev->ops->enter)
+ pdev->ops->enter(pdev);
+
+ return 0;
+}
+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;
+
+ /* Moving to USB Safe State */
+ ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
+ if (ret)
+ return ret;
+
+ /* Exit Mode command */
+ if (pdev->ops && pdev->ops->exit)
+ pdev->ops->exit(pdev);
+
+ return 0;
+}
+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, const 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 pdev->ops->vdm(pdev, header, vdo, count);
+
+ return 0;
+}
+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,
+ int 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 */
+
+bool typec_altmode_ufp_capable(struct typec_altmode *adev)
+{
+ struct altmode *altmode = to_altmode(adev);
+
+ if (!is_typec_port(adev->dev.parent))
+ return false;
+
+ return !(altmode->roles == TYPEC_PORT_DFP);
+}
+EXPORT_SYMBOL_GPL(typec_altmode_ufp_capable);
+
+bool typec_altmode_dfp_capable(struct typec_altmode *adev)
+{
+ struct altmode *altmode = to_altmode(adev);
+
+ if (!is_typec_port(adev->dev.parent))
+ return false;
+
+ return !(altmode->roles == TYPEC_PORT_UFP);
+}
+EXPORT_SYMBOL_GPL(typec_altmode_dfp_capable);
+
+/**
+ * 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,
+};
diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h
new file mode 100644
index 000000000000..19911665a5f9
--- /dev/null
+++ b/drivers/usb/typec/bus.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __USB_TYPEC_ALTMODE_H__
+#define __USB_TYPEC_ALTMODE_H__
+
+#include <linux/usb/typec.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__ */
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index b8a66babd2cd..e19bf2f8f18e 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -13,25 +13,12 @@
#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 +33,13 @@ 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 +60,14 @@ 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 +149,148 @@ 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 (!port_dev)
+ return 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 +317,7 @@ 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 +326,7 @@ 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 +335,7 @@ 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 +343,37 @@ 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 +383,7 @@ 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 +402,72 @@ 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 +477,74 @@ 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);
+
+ /* 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->dev);
+ 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 +582,7 @@ 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 +648,7 @@ 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 +697,7 @@ 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 +750,7 @@ 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;
@@ -1077,12 +1265,13 @@ 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,
@@ -1217,11 +1406,11 @@ EXPORT_SYMBOL_GPL(typec_set_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)
{
@@ -1235,6 +1424,7 @@ 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.
@@ -1245,7 +1435,23 @@ 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);

@@ -1319,10 +1525,12 @@ 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;
@@ -1366,8 +1574,19 @@ 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);

@@ -1375,6 +1594,7 @@ static void __exit typec_exit(void)
{
class_destroy(typec_class);
ida_destroy(&typec_index_ida);
+ bus_unregister(&typec_bus);
}
module_exit(typec_exit);

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 61fbfbc03e5b..be8f8fc368a5 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -735,4 +735,19 @@ 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 */
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 9dbf7f95aa86..4c6c4eb27d6f 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -4,16 +4,13 @@
#define __LINUX_USB_TYPEC_H

#include <linux/types.h>
-
-/* XXX: Once we have a header for USB Power Delivery, this belongs there */
-#define ALTMODE_MAX_MODES 6
+#include <linux/usb/typec_altmode.h>

/* USB Type-C Specification releases */
#define USB_TYPEC_REV_1_0 0x100 /* 1.0 */
#define USB_TYPEC_REV_1_1 0x110 /* 1.1 */
#define USB_TYPEC_REV_1_2 0x120 /* 1.2 */

-struct typec_altmode;
struct typec_partner;
struct typec_cable;
struct typec_plug;
@@ -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. */
diff --git a/include/linux/usb/typec_altmode.h b/include/linux/usb/typec_altmode.h
new file mode 100644
index 000000000000..594bee51fb99
--- /dev/null
+++ b/include/linux/usb/typec_altmode.h
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __USB_TYPEC_ALTMODE_H
+#define __USB_TYPEC_ALTMODE_H
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.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 {
+ void (*enter)(struct typec_altmode *altmode);
+ void (*exit)(struct typec_altmode *altmode);
+ void (*attention)(struct typec_altmode *altmode, const 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, const 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,
+ int 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_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 */
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index 9fad6afe4c41..c48c7f56ae64 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -218,5 +218,9 @@ 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;
}
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index b9beeaa4695b..a8afba836409 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1341,6 +1341,19 @@ 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)
{
--
2.17.0
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