lkml.org 
[lkml]   [2016]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCHv4 1/2] usb: USB Type-C connector class
Date
The purpose of USB Type-C connector class is to provide
unified interface for the user space to get the status and
basic information about USB Type-C connectors on a system,
control over data role swapping, and when the port supports
USB Power Delivery, also control over power role swapping
and Alternate Modes.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
Documentation/ABI/testing/sysfs-class-typec | 236 +++++
Documentation/usb/typec.txt | 103 +++
MAINTAINERS | 9 +
drivers/usb/Kconfig | 2 +
drivers/usb/Makefile | 2 +
drivers/usb/typec/Kconfig | 7 +
drivers/usb/typec/Makefile | 1 +
drivers/usb/typec/typec.c | 1277 +++++++++++++++++++++++++++
include/linux/usb/typec.h | 260 ++++++
9 files changed, 1897 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-typec
create mode 100644 Documentation/usb/typec.txt
create mode 100644 drivers/usb/typec/Kconfig
create mode 100644 drivers/usb/typec/Makefile
create mode 100644 drivers/usb/typec/typec.c
create mode 100644 include/linux/usb/typec.h

diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
new file mode 100644
index 0000000..7cd40e5
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -0,0 +1,236 @@
+USB Type-C port devices (eg. /sys/class/typec/usbc0/)
+
+What: /sys/class/typec/<port>/current_data_role
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ The current USB data role the port is operating in. This
+ attribute can be used for requesting data role swapping on the
+ port.
+
+ Valid values:
+ - host
+ - device
+
+What: /sys/class/typec/<port>/current_power_role
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ The current power role of the port. This attribute can be used
+ to request power role swap on the port when the port supports
+ USB Power Delivery.
+
+ Valid values:
+ - source
+ - sink
+
+What: /sys/class/typec/<port>/current_vconn_role
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows the current VCONN role of the port. This attribute can be
+ used to request VCONN role swap on the port when the port
+ supports USB Power Delivery.
+
+ Valid values are:
+ - source
+ - sink
+
+What: /sys/class/typec/<port>/power_operation_mode
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows the current power operational mode the port is in.
+
+ Valid values:
+ - USB - Normal power levels defined in USB specifications
+ - BC1.2 - Power levels defined in Battery Charging Specification
+ v1.2
+ - USB Type-C 1.5A - Higher 1.5A current defined in USB Type-C
+ specification.
+ - USB Type-C 3.0A - Higher 3A current defined in USB Type-C
+ specification.
+ - USB Power Delivery - The voltages and currents defined in USB
+ Power Delivery specification
+
+What: /sys/class/typec/<port>/preferred_role
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ The user space can notify the driver about the preferred role.
+ It should be handled as enabling of Try.SRC or Try.SNK, as
+ defined in USB Type-C specification, in the port drivers. By
+ default there is no preferred role.
+
+ Valid values:
+ - host
+ - device
+ - For example "none" to remove preference (anything else except
+ "host" or "device")
+
+What: /sys/class/typec/<port>/supported_accessory_modes
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Lists the Accessory Modes, defined in the USB Type-C
+ specification, the port supports.
+
+What: /sys/class/typec/<port>/supported_data_roles
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Lists the USB data roles the port is capable of supporting.
+
+ Valid values:
+ - device
+ - host
+ - device, host (DRD as defined in USB Type-C specification v1.2)
+
+What: /sys/class/typec/<port>/supported_power_roles
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Lists the power roles the port is capable of supporting.
+
+ Valid values:
+ - source
+ - sink
+
+What: /sys/class/typec/<port>/supports_usb_power_delivery
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows if the port supports USB Power Delivery.
+ - 1 if USB Power Delivery is supported
+ - 0 when it's not
+
+
+USB Type-C partner devices (eg. /sys/class/typec/usbc0-partner/)
+
+What: /sys/class/typec/<port>-partner/accessory
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ The attribute is visible only when the partner's type is
+ "Accessory". The type can be read from its own attribute.
+
+ Shows the name of the Accessory Mode. The Accessory Modes are
+ defined in USB Type-C Specification.
+
+What: /sys/class/typec/<port>-partner/type
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows the type of the partner. Can be one of the following:
+ - USB - When the partner is normal USB host/peripheral.
+ - Charger - When the partner has been identified as dedicated
+ charger.
+ - Alternate Mode - When the partner supports Alternate Modes.
+ - Accessory - When the partner is one of the accessories with
+ specific Accessory Mode defined in USB Type-C
+ specification.
+
+What: /sys/class/typec/<port>-partner/supports_usb_power_delivery
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows if the partner supports USB Power Delivery.
+ - 1 if USB Power Delivery is supported
+ - 0 when it's not
+
+
+What: /sys/class/typec/<port>-partner/id_header_vdo
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ If the partner supports USB Power Deliver, shows the VDO
+ returned from Discover Identity USB Power Delivery command.
+
+ If the partner does not support USB Power Delivery, the
+ attribute is hidden.
+
+
+USB Type-C cable devices (eg. /sys/class/typec/usbc0-cable/)
+
+Note: Electronically Marked Cables will have a device also for one cable plug
+(eg. /sys/class/typec/usbc0-plug0). If the cable is active and has also SOP
+Double Prime controller (USB Power Deliver specification ch. 2.4) it will have
+second device also for the other plug. Both plugs may have their alternate modes
+as described in USB Type-C and USB Power Delivery specifications.
+
+What: /sys/class/typec/<port>-cable/active
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows if the cable is active or passive.
+
+ Valid values:
+ - 0 when the cable is passive
+ - 1 when the cable is active
+
+What: /sys/class/typec/<port>-cable/plug_type
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows type of the plug on the cable:
+ - Type-A - Standard A
+ - Type-B - Standard B
+ - Type-C - USB Type-C
+ - Captive - Non-standard
+
+What: /sys/class/typec/<port>-cable/supports_usb_power_delivery
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows if the cable supports USB Power Delivery communication.
+ - 1 if USB Power Delivery is supported
+ - 0 when it's not
+
+What: /sys/class/typec/<port>-cable/id_header_vdo
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ If the cable supports USB Power Deliver, shows the VDO
+ returned from Discover Identity USB Power Delivery command.
+
+ If the cable does not support USB Power Delivery, the
+ attribute is hidden.
+
+
+Alternate Mode devices (For example,
+/sys/class/typec/usbc0-partner/usbc0-partner.svid:xxxx/). The ports, partners
+and cable plugs can have alternate modes.
+
+What: /sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/active
+Date: June 2016
+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.
+
+What: /sys/class/typec/<dev>/<dev>.svid:<svid>/<mode>/description
+Date: June 2016
+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/<dev>/<dev>.svid:<svid>/<mode>/vdo
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows the VDO in hexadecimal returned from the Discover Modes
+ command.
+
+What: /sys/class/typec/<port>/<port>.svid:<svid>/<mode>/supported_roles
+Date: June 2016
+Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+ Shows the roles, source or sink, the mode is supported with.
+
+ This attribute is available for the devices describing the
+ alternate modes a port supports, and it will not be exposed with
+ the devices presenting the alternate modes the partners or cable
+ plugs support.
diff --git a/Documentation/usb/typec.txt b/Documentation/usb/typec.txt
new file mode 100644
index 0000000..dce5f07
--- /dev/null
+++ b/Documentation/usb/typec.txt
@@ -0,0 +1,103 @@
+USB Type-C connector class
+==========================
+
+Introduction
+------------
+The typec class is meant for describing the USB Type-C ports in a system to the
+user space in unified fashion. The class is designed to provide nothing else
+except the user space interface implementation in hope that it can be utilized
+on as many platforms as possible.
+
+The platforms are expected to register every USB Type-C port they have with the
+class. In a normal case the registration will be done by a USB Type-C or PD PHY
+driver, but it may be a driver for firmware interface such as UCSI, driver for
+USB PD controller or even driver for Thunderbolt3 controller. This document
+considers the component registering the USB Type-C ports with the class as "port
+driver".
+
+On top of showing the capabilities, the class also offer the user space control
+over the roles and alternate modes they support when the port driver is capable
+of supporting those features.
+
+The class provides an API for the port drivers described in this document. The
+attributes are described in Documentation/ABI/testing/sysfs-class-typec.
+
+
+Interface
+---------
+Every port will be presented as its own device under /sys/class/typec/. The
+first port will be named "usbc0", the second "usbc1" and so on.
+
+When connected, the partner will be presented also as its own device under
+/sys/class/typec/. The parent of the partner device will always be the port. The
+partner attached to port "usbc0" will be named "usbc0-partner". Full patch to
+the device would be /sys/class/typec/usb0/usb0-partner/.
+
+The cable and the two plugs on it may also be optionally presented as their own
+devices under /sys/class/typec/. The cable attached to the port "usbc0" port
+will be named usbc0-cable and the plug on the SOP Prime end (see USB Power
+Delivery Specification ch. 2.4) will be named "usbc-plug0" and on the SOP Double
+Prime end "usbc0-plug1". The parent of a cable will always be the port, and the
+parent of the cable plugs will always be the cable.
+
+If the port, partner or cable plug support Alternate Modes, every Alternate Mode
+SVID will have their own device describing them. The Alternate Modes will not be
+attached to the typec class. For the port's "usbc0" partner, the Alternate Modes
+would have devices presented under /sys/class/typec/usbc0-partner/. Every mode
+that is supported will have its own group under the Alternate Mode device named
+"mode<id>". For example /sys/class/typec/usbc0/usbc0.svid:xxxx/mode0/. The
+requests for entering/exiting the modes happens with the "active" attribute in
+that group.
+
+
+API
+---
+
+* Registering the ports
+
+The port drivers will describe every Type-C port they control with struct
+typec_capability data structure, and register them with the following API:
+
+struct typec_port *typec_register_port(struct device *dev,
+ const struct typec_capability *cap);
+
+The class will provide handle to struct typec_port on success and ERR_PTR on
+failure. The un-registration of the port happens with the following API:
+
+void typec_unregister_port(struct typec_port *port);
+
+
+* Notifications
+
+When connection happens on a port, the port driver fills struct typec_connection
+which is passed to the class. The class provides the following API for reporting
+connection/disconnection:
+
+int typec_connect(struct typec_port *port, struct typec_connection *);
+void typec_disconnect(struct typec_port *);
+
+When the partner end has executed a role change, the port driver uses the
+following APIs to report it to the class:
+
+void typec_set_data_role(struct typec_port *, enum typec_data_role);
+void typec_set_pwr_role(struct typec_port *, enum typec_role);
+void typec_set_vconn_role(struct typec_port *, enum typec_role);
+void typec_set_pwr_opmode(struct typec_port *, enum typec_pwr_opmode);
+
+
+* Alternate Modes
+
+After connection, the port drivers register the alternate modes the partner
+and/or cable plugs support. And before reporting disconnection, the port driver
+_must_ unregister all the alternate modes registered for the partner and cable
+plugs. The API takes the struct device of the partner or the cable plug as
+parameter:
+
+int typec_register_altmodes(struct device *, struct typec_altmode *);
+void typec_unregister_altmodes(struct device *);
+
+When the partner end enters or exits the modes, the port driver needs to notify
+the class with the following API:
+
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+ bool active);
diff --git a/MAINTAINERS b/MAINTAINERS
index 952fd2a..8fe0977 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11983,6 +11983,15 @@ F: drivers/usb/
F: include/linux/usb.h
F: include/linux/usb/

+USB TYPEC SUBSYSTEM
+M: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+L: linux-usb@vger.kernel.org
+S: Maintained
+F: Documentation/ABI/testing/sysfs-class-typec
+F: Documentation/usb/typec.txt
+F: drivers/usb/typec/
+F: include/linux/usb/typec.h
+
USB UHCI DRIVER
M: Alan Stern <stern@rowland.harvard.edu>
L: linux-usb@vger.kernel.org
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 8689dcb..f42a3d3 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -150,6 +150,8 @@ source "drivers/usb/phy/Kconfig"

source "drivers/usb/gadget/Kconfig"

+source "drivers/usb/typec/Kconfig"
+
config USB_LED_TRIG
bool "USB LED Triggers"
depends on LEDS_CLASS && USB_COMMON && LEDS_TRIGGERS
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index dca7856..51e381e 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -61,3 +61,5 @@ obj-$(CONFIG_USB_GADGET) += gadget/
obj-$(CONFIG_USB_COMMON) += common/

obj-$(CONFIG_USBIP_CORE) += usbip/
+
+obj-$(CONFIG_TYPEC) += typec/
diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
new file mode 100644
index 0000000..b229fb9
--- /dev/null
+++ b/drivers/usb/typec/Kconfig
@@ -0,0 +1,7 @@
+
+menu "USB PD and Type-C drivers"
+
+config TYPEC
+ tristate
+
+endmenu
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
new file mode 100644
index 0000000..1012a8b
--- /dev/null
+++ b/drivers/usb/typec/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_TYPEC) += typec.o
diff --git a/drivers/usb/typec/typec.c b/drivers/usb/typec/typec.c
new file mode 100644
index 0000000..bbfd6e5
--- /dev/null
+++ b/drivers/usb/typec/typec.c
@@ -0,0 +1,1277 @@
+/*
+ * USB Type-C Connector Class
+ *
+ * Copyright (C) 2016, Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb/typec.h>
+
+struct typec_port {
+ unsigned int id;
+ struct device dev;
+ struct mutex lock; /* device lock */
+
+ int prefer_role;
+
+ enum typec_data_role data_role;
+ enum typec_role pwr_role;
+ enum typec_role vconn_role;
+ enum typec_pwr_opmode pwr_opmode;
+
+ struct typec_partner *partner;
+ struct typec_cable *cable;
+
+ unsigned int connected:1;
+
+ const struct typec_capability *cap;
+};
+
+#define to_typec_port(p) container_of(p, struct typec_port, dev)
+
+static DEFINE_IDA(typec_index_ida);
+
+static struct class typec_class = {
+ .name = "typec",
+};
+
+static const char * const typec_accessory_modes[] = {
+ [TYPEC_ACCESSORY_NONE] = "none",
+ [TYPEC_ACCESSORY_AUDIO] = "Audio",
+ [TYPEC_ACCESSORY_DEBUG] = "Debug",
+ [TYPEC_ACCESSORY_DAUDIO] = "Digital Audio",
+};
+
+/* ------------------------------------------------------------------------- */
+/* Type-C Partners */
+
+static void typec_dev_release(struct device *dev)
+{
+}
+
+static const char * const typec_partner_types[] = {
+ [TYPEC_PARTNER_USB] = "USB",
+ [TYPEC_PARTNER_CHARGER] = "Charger",
+ [TYPEC_PARTNER_ALTMODE] = "Alternate Mode",
+ [TYPEC_PARTNER_ACCESSORY] = "Accessory",
+};
+
+static ssize_t partner_type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct typec_partner *partner = container_of(dev, struct typec_partner,
+ dev);
+
+ return sprintf(buf, "%s\n", typec_partner_types[partner->type]);
+}
+
+static struct device_attribute dev_attr_partner_type = {
+ .attr = {
+ .name = "type",
+ .mode = S_IRUGO,
+ },
+ .show = partner_type_show,
+};
+
+static ssize_t
+partner_accessory_mode_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_partner *partner = container_of(dev, struct typec_partner,
+ dev);
+
+ return sprintf(buf, "%s\n", typec_accessory_modes[partner->accessory]);
+}
+
+static struct device_attribute dev_attr_partner_accessory = {
+ .attr = {
+ .name = "accessory",
+ .mode = S_IRUGO,
+ },
+ .show = partner_accessory_mode_show,
+};
+
+static ssize_t partner_usb_pd_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct typec_partner *partner = container_of(dev, struct typec_partner,
+ dev);
+
+ return sprintf(buf, "%d\n", partner->usb_pd);
+}
+
+static struct device_attribute dev_attr_partner_usb_pd = {
+ .attr = {
+ .name = "supports_usb_power_delivery",
+ .mode = S_IRUGO,
+ },
+ .show = partner_usb_pd_show,
+};
+
+static ssize_t partner_vdo_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct typec_partner *partner = container_of(dev, struct typec_partner,
+ dev);
+
+ return sprintf(buf, "0x%08x\n", partner->vdo);
+}
+
+static struct device_attribute dev_attr_partner_vdo = {
+ .attr = {
+ .name = "id_header_vdo",
+ .mode = S_IRUGO,
+ },
+ .show = partner_vdo_show,
+};
+
+static struct attribute *typec_partner_attrs[] = {
+ &dev_attr_partner_accessory.attr,
+ &dev_attr_partner_type.attr,
+ &dev_attr_partner_usb_pd.attr,
+ &dev_attr_partner_vdo.attr,
+ NULL
+};
+
+static umode_t partner_is_visible(struct kobject *kobj, struct attribute *attr,
+ int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct typec_partner *partner = container_of(dev, struct typec_partner,
+ dev);
+
+ if (attr == &dev_attr_partner_accessory.attr &&
+ partner->type != TYPEC_PARTNER_ACCESSORY)
+ return 0;
+
+ if (attr == &dev_attr_partner_vdo.attr && !partner->usb_pd)
+ return 0;
+
+ return attr->mode;
+}
+
+static struct attribute_group typec_partner_group = {
+ .attrs = typec_partner_attrs,
+ .is_visible = partner_is_visible,
+};
+
+static const struct attribute_group *typec_partner_groups[] = {
+ &typec_partner_group,
+ NULL
+};
+
+static struct device_type typec_partner_dev_type = {
+ .name = "typec_partner_device",
+ .groups = typec_partner_groups,
+ .release = typec_dev_release,
+};
+
+static int
+typec_add_partner(struct typec_port *port, struct typec_partner *partner)
+{
+ struct device *dev = &partner->dev;
+ int ret;
+
+ dev->class = &typec_class;
+ dev->parent = &port->dev;
+ dev->type = &typec_partner_dev_type;
+ dev_set_name(dev, "%s-partner", dev_name(&port->dev));
+
+ ret = device_register(dev);
+ if (ret) {
+ put_device(dev);
+ return ret;
+ }
+
+ port->partner = partner;
+ return 0;
+}
+
+static void typec_remove_partner(struct typec_port *port)
+{
+ WARN_ON(port->partner->alt_modes);
+ device_unregister(&port->partner->dev);
+}
+
+/* ------------------------------------------------------------------------- */
+/* Type-C Cable Plugs */
+
+static struct device_type typec_plug_dev_type = {
+ .name = "type_plug_device",
+ .release = typec_dev_release,
+};
+
+static int
+typec_add_plug(struct typec_port *port, struct typec_plug *plug)
+{
+ struct device *dev = &plug->dev;
+ char name[8];
+ int ret;
+
+ sprintf(name, "plug%d", plug->index);
+
+ dev->class = &typec_class;
+ dev->parent = &port->cable->dev;
+ dev->type = &typec_plug_dev_type;
+ dev_set_name(dev, "%s-%s", dev_name(&port->dev), name);
+
+ ret = device_register(dev);
+ if (ret) {
+ put_device(dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void typec_remove_plug(struct typec_plug *plug)
+{
+ WARN_ON(plug->alt_modes);
+ device_unregister(&plug->dev);
+}
+
+/* Type-C Cables */
+
+static ssize_t
+cable_active_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+ return sprintf(buf, "%d\n", cable->active);
+}
+
+static struct device_attribute dev_attr_cable_active = {
+ .attr = {
+ .name = "active",
+ .mode = S_IRUGO,
+ },
+ .show = cable_active_show,
+};
+
+static ssize_t cable_usb_pd_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+ return sprintf(buf, "%d\n", cable->usb_pd);
+}
+
+static struct device_attribute dev_attr_cable_usb_pd = {
+ .attr = {
+ .name = "supports_usb_power_delivery",
+ .mode = S_IRUGO,
+ },
+ .show = cable_usb_pd_show,
+};
+
+static ssize_t cable_vdo_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+ return sprintf(buf, "0x%08x\n", cable->vdo);
+}
+
+static struct device_attribute dev_attr_cable_vdo = {
+ .attr = {
+ .name = "id_header_vdo",
+ .mode = S_IRUGO,
+ },
+ .show = cable_vdo_show,
+};
+
+static const char * const typec_plug_types[] = {
+ [USB_PLUG_NONE] = "unknown",
+ [USB_PLUG_TYPE_A] = "Type-A",
+ [USB_PLUG_TYPE_B] = "Type-B",
+ [USB_PLUG_TYPE_C] = "Type-C",
+ [USB_PLUG_CAPTIVE] = "Captive",
+};
+
+static ssize_t
+cable_plug_type_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+ return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
+}
+
+static struct device_attribute dev_attr_plug_type = {
+ .attr = {
+ .name = "plug_type",
+ .mode = S_IRUGO,
+ },
+ .show = cable_plug_type_show,
+};
+
+static struct attribute *typec_cable_attrs[] = {
+ &dev_attr_cable_active.attr,
+ &dev_attr_cable_usb_pd.attr,
+ &dev_attr_cable_vdo.attr,
+ &dev_attr_plug_type.attr,
+ NULL
+};
+
+static umode_t cable_is_visible(struct kobject *kobj, struct attribute *attr,
+ int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct typec_cable *cable = container_of(dev, struct typec_cable, dev);
+
+ if (attr == &dev_attr_cable_vdo.attr && !cable->usb_pd)
+ return 0;
+
+ return attr->mode;
+}
+
+static struct attribute_group typec_cable_group = {
+ .attrs = typec_cable_attrs,
+ .is_visible = cable_is_visible,
+};
+
+static const struct attribute_group *typec_cable_groups[] = {
+ &typec_cable_group,
+ NULL
+};
+
+static struct device_type typec_cable_dev_type = {
+ .name = "typec_cable_device",
+ .groups = typec_cable_groups,
+ .release = typec_dev_release,
+};
+
+static int typec_add_cable(struct typec_port *port, struct typec_cable *cable)
+{
+ struct device *dev = &cable->dev;
+ int ret;
+
+ dev->class = &typec_class;
+ dev->parent = &port->dev;
+ dev->type = &typec_cable_dev_type;
+ dev_set_name(dev, "%s-cable", dev_name(&port->dev));
+
+ ret = device_register(dev);
+ if (ret) {
+ put_device(dev);
+ return ret;
+ }
+
+ /* Plug1 */
+ if (!cable->usb_pd)
+ return 0;
+
+ cable->plug[0].index = 1;
+ ret = typec_add_plug(port, &cable->plug[0]);
+ if (ret) {
+ device_unregister(dev);
+ return ret;
+ }
+
+ /* Plug2 */
+ if (!cable->active || !cable->sop_pp_controller)
+ return 0;
+
+ cable->plug[1].index = 2;
+ ret = typec_add_plug(port, &cable->plug[1]);
+ if (ret) {
+ typec_remove_plug(&cable->plug[0]);
+ device_unregister(dev);
+ return ret;
+ }
+
+ port->cable = cable;
+ return 0;
+}
+
+static void typec_remove_cable(struct typec_port *port)
+{
+ if (port->cable->active) {
+ typec_remove_plug(&port->cable->plug[0]);
+ if (port->cable->sop_pp_controller)
+ typec_remove_plug(&port->cable->plug[1]);
+ }
+ device_unregister(&port->cable->dev);
+}
+
+/* ------------------------------------------------------------------------- */
+/* API for the port drivers */
+
+static void typec_init_roles(struct typec_port *port)
+{
+ if (port->prefer_role < 0)
+ return;
+
+ if (port->prefer_role == TYPEC_SOURCE) {
+ port->data_role = TYPEC_HOST;
+ port->pwr_role = TYPEC_SOURCE;
+ port->vconn_role = TYPEC_SOURCE;
+ } else {
+ /* Device mode as default also by default with DRP ports */
+ port->data_role = TYPEC_DEVICE;
+ port->pwr_role = TYPEC_SINK;
+ port->vconn_role = TYPEC_SINK;
+ }
+}
+
+int typec_connect(struct typec_port *port, struct typec_connection *con)
+{
+ int ret;
+
+ if (!con->partner && !con->cable)
+ return -EINVAL;
+
+ port->connected = 1;
+ port->data_role = con->data_role;
+ port->pwr_role = con->pwr_role;
+ port->vconn_role = con->vconn_role;
+ port->pwr_opmode = con->pwr_opmode;
+
+ kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+
+ if (con->cable) {
+ ret = typec_add_cable(port, con->cable);
+ if (ret)
+ return ret;
+ }
+
+ if (con->partner) {
+ ret = typec_add_partner(port, con->partner);
+ if (ret) {
+ if (con->cable)
+ typec_remove_cable(port);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(typec_connect);
+
+void typec_disconnect(struct typec_port *port)
+{
+ if (port->partner)
+ typec_remove_partner(port);
+
+ if (port->cable)
+ typec_remove_cable(port);
+
+ port->connected = 0;
+ port->partner = NULL;
+ port->cable = NULL;
+
+ port->pwr_opmode = TYPEC_PWR_MODE_USB;
+
+ typec_init_roles(port);
+
+ kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+}
+EXPORT_SYMBOL_GPL(typec_disconnect);
+
+/* --------------------------------------- */
+/* Driver callbacks to report role updates */
+
+void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
+{
+ mutex_lock(&port->lock);
+ port->data_role = role;
+ sysfs_notify(&port->dev.kobj, NULL, "current_data_role");
+ mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_data_role);
+
+void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
+{
+ mutex_lock(&port->lock);
+ port->pwr_role = role;
+ sysfs_notify(&port->dev.kobj, NULL, "current_power_role");
+ mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_pwr_role);
+
+void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
+{
+ mutex_lock(&port->lock);
+ port->vconn_role = role;
+ sysfs_notify(&port->dev.kobj, NULL, "current_vconn_role");
+ mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_vconn_role);
+
+void typec_set_pwr_opmode(struct typec_port *port,
+ enum typec_pwr_opmode opmode)
+{
+ mutex_lock(&port->lock);
+ port->pwr_opmode = opmode;
+ sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
+ mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_set_pwr_opmode);
+
+/* -------------------------------- */
+/* Alternate Modes */
+
+/*
+ * typec_altmode_update_active - Notify about Enter/Exit mode
+ * @alt: Handle to the Alternate Mode
+ * @mode: Mode id
+ * @active: True when the mode has been enterred
+ */
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+ bool active)
+{
+ struct typec_port *port = typec_altmode2port(alt);
+ struct typec_mode *m = alt->modes + mode;
+ char dir[6];
+
+ mutex_lock(&port->lock);
+ m->active = active;
+ sprintf(dir, "mode%d", mode);
+ sysfs_notify(&alt->dev.kobj, dir, "active");
+ mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL(typec_altmode_update_active);
+
+static struct device_type typec_port_dev_type;
+
+/*
+ * typec_altmode2port - Alternate Mode to USB Type-C port
+ * @alt: The Alternate Mode
+ *
+ * Returns the port that the cable plug or partner with @alt is connected to.
+ */
+struct typec_port *typec_altmode2port(struct typec_altmode *alt)
+{
+ if (alt->dev.parent->type == &typec_plug_dev_type)
+ return to_typec_port(alt->dev.parent->parent->parent);
+ if (alt->dev.parent->type == &typec_partner_dev_type)
+ return to_typec_port(alt->dev.parent->parent);
+ if (alt->dev.parent->type == &typec_port_dev_type)
+ return to_typec_port(alt->dev.parent);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(typec_altmode2port);
+
+static void typec_altmode_release(struct device *dev)
+{
+ struct typec_altmode *alt = to_altmode(dev);
+
+ kfree(alt->mode_groups);
+}
+
+static ssize_t
+typec_altmode_vdo_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_mode *mode = container_of(attr, struct typec_mode,
+ vdo_attr);
+ struct typec_port *port = typec_altmode2port(mode->alt_mode);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "0x%08x\n", mode->vdo);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+
+static ssize_t
+typec_altmode_desc_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_mode *mode = container_of(attr, struct typec_mode,
+ desc_attr);
+ struct typec_port *port = typec_altmode2port(mode->alt_mode);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%s\n", mode->desc ? mode->desc : "");
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+
+static ssize_t
+typec_altmode_active_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_mode *mode = container_of(attr, struct typec_mode,
+ active_attr);
+ struct typec_port *port = typec_altmode2port(mode->alt_mode);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%d\n", mode->active);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+
+static ssize_t
+typec_altmode_active_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct typec_mode *mode = container_of(attr, struct typec_mode,
+ active_attr);
+ struct typec_port *port = typec_altmode2port(mode->alt_mode);
+ bool activate;
+ int ret;
+
+ ret = kstrtobool(buf, &activate);
+ if (ret)
+ return ret;
+
+ if (activate > 1)
+ return -EINVAL;
+
+ mutex_lock(&port->lock);
+ ret = port->cap->activate_mode(mode->alt_mode, mode->index, activate);
+ if (!ret) {
+ mode->active = activate;
+ ret = size;
+ }
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+
+static ssize_t
+typec_altmode_roles_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_mode *mode = container_of(attr, struct typec_mode,
+ roles_attr);
+ struct typec_port *port = typec_altmode2port(mode->alt_mode);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ switch (mode->roles) {
+ case TYPEC_PORT_DFP:
+ ret = sprintf(buf, "source\n");
+ break;
+ case TYPEC_PORT_UFP:
+ ret = sprintf(buf, "sink\n");
+ break;
+ case TYPEC_PORT_DRP:
+ default:
+ ret = sprintf(buf, "source, sink\n");
+ break;
+ }
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+
+static void typec_init_modes(struct typec_altmode *alt, int is_port)
+{
+ struct typec_mode *mode = alt->modes;
+ int i;
+
+ for (i = 0; i < alt->n_modes; i++, mode++) {
+ mode->alt_mode = alt;
+ mode->index = i;
+ sprintf(mode->group_name, "mode%d", i);
+
+ sysfs_attr_init(&mode->vdo_attr.attr);
+ mode->vdo_attr.attr.name = "vdo";
+ mode->vdo_attr.attr.mode = S_IRUGO;
+ mode->vdo_attr.show = typec_altmode_vdo_show;
+
+ sysfs_attr_init(&mode->desc_attr.attr);
+ mode->desc_attr.attr.name = "description";
+ mode->desc_attr.attr.mode = S_IRUGO;
+ mode->desc_attr.show = typec_altmode_desc_show;
+
+ sysfs_attr_init(&mode->active_attr.attr);
+ mode->active_attr.attr.name = "active";
+ mode->active_attr.attr.mode = S_IWUSR | S_IRUGO;
+ mode->active_attr.show = typec_altmode_active_show;
+ mode->active_attr.store = typec_altmode_active_store;
+
+ mode->attrs[0] = &mode->vdo_attr.attr;
+ mode->attrs[1] = &mode->desc_attr.attr;
+ mode->attrs[2] = &mode->active_attr.attr;
+
+ /* With ports, list the roles that the mode is supported with */
+ if (is_port) {
+ sysfs_attr_init(&mode->roles_attr.attr);
+ mode->roles_attr.attr.name = "supported_roles";
+ mode->roles_attr.attr.mode = S_IRUGO;
+ mode->roles_attr.show = typec_altmode_roles_show;
+
+ mode->attrs[3] = &mode->roles_attr.attr;
+ }
+
+ mode->group.attrs = mode->attrs;
+ mode->group.name = mode->group_name;
+
+ alt->mode_groups[i] = &mode->group;
+ }
+}
+
+static int
+typec_add_altmode(struct device *parent, struct typec_altmode *alt, int is_port)
+{
+ struct device *dev = &alt->dev;
+ int ret;
+
+ alt->mode_groups = kcalloc(alt->n_modes + 1,
+ sizeof(struct attibute_group *), GFP_KERNEL);
+ if (!alt->mode_groups)
+ return -ENOMEM;
+
+ typec_init_modes(alt, is_port);
+
+ dev->groups = alt->mode_groups;
+ dev->release = typec_altmode_release;
+ dev->parent = parent;
+ /* TODO: if (!is_port) dev->bus = &typec_altmode_bus; */
+
+ dev_set_name(dev, "%s.svid:%04x", dev_name(parent), alt->svid);
+
+ ret = device_register(dev);
+ if (ret) {
+ put_device(dev);
+ kfree(alt->mode_groups);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __typec_register_altmodes(struct device *parent,
+ struct typec_altmode *alt_modes,
+ int is_port)
+{
+ struct typec_altmode *alt;
+ int index;
+ int ret;
+
+ if (!alt_modes)
+ return 0;
+
+ for (alt = alt_modes, index = 0; alt->svid; alt++, index++) {
+ ret = typec_add_altmode(parent, alt, is_port);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+err:
+ for (alt = alt_modes + index; index; alt--, index--)
+ device_unregister(&alt->dev);
+
+ return ret;
+}
+
+int typec_register_altmodes(struct device *dev, struct typec_altmode *alt_modes)
+{
+ if (dev->type == &typec_partner_dev_type) {
+ struct typec_partner *p = container_of(dev,
+ struct typec_partner,
+ dev);
+ p->alt_modes = alt_modes;
+ } else if (dev->type == &typec_plug_dev_type) {
+ struct typec_plug *p = container_of(dev, struct typec_plug,
+ dev);
+ p->alt_modes = alt_modes;
+ } else {
+ return -ENODEV;
+ }
+
+ return __typec_register_altmodes(dev, alt_modes, false);
+}
+EXPORT_SYMBOL_GPL(typec_register_altmodes);
+
+void typec_unregister_altmodes(struct device *dev)
+{
+ struct typec_altmode *alt_modes = NULL;
+ struct typec_altmode *alt;
+
+ if (dev->type == &typec_partner_dev_type) {
+ struct typec_partner *p = container_of(dev,
+ struct typec_partner,
+ dev);
+ alt_modes = p->alt_modes;
+ p->alt_modes = NULL;
+ } else if (dev->type == &typec_plug_dev_type) {
+ struct typec_plug *p = container_of(dev, struct typec_plug,
+ dev);
+ alt_modes = p->alt_modes;
+ p->alt_modes = NULL;
+ }
+
+ if (!alt_modes)
+ return;
+
+ for (alt = alt_modes; alt->svid; alt++)
+ device_unregister(&alt->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_altmodes);
+
+/* ------------------------------------------------------------------------- */
+
+static const char * const typec_roles[] = {
+ [TYPEC_SINK] = "sink",
+ [TYPEC_SOURCE] = "source",
+};
+
+static const char * const typec_data_roles[] = {
+ [TYPEC_DEVICE] = "device",
+ [TYPEC_HOST] = "host",
+};
+
+static ssize_t
+preferred_role_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct typec_port *port = to_typec_port(dev);
+ enum typec_role role;
+ int ret;
+
+ mutex_lock(&port->lock);
+
+ if (port->cap->type != TYPEC_PORT_DRP) {
+ dev_dbg(dev, "Preferred role only supported with DRP ports\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!port->cap->try_role) {
+ dev_dbg(dev, "Setting preferred role not supported\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ ret = match_string(typec_roles, ARRAY_SIZE(typec_roles), buf);
+ if (ret < 0) {
+ port->prefer_role = -1;
+ ret = size;
+ goto out;
+ }
+
+ role = ret;
+
+ ret = port->cap->try_role(port->cap, role);
+ if (ret)
+ goto out;
+
+ port->prefer_role = role;
+ ret = size;
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+
+static ssize_t
+preferred_role_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ ssize_t ret = 0;
+
+ mutex_lock(&port->lock);
+
+ if (port->prefer_role < 0)
+ goto out;
+
+ ret = sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+static DEVICE_ATTR_RW(preferred_role);
+
+static ssize_t
+current_data_role_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct typec_port *port = to_typec_port(dev);
+ int ret = size;
+
+ mutex_lock(&port->lock);
+
+ if (port->cap->type != TYPEC_PORT_DRP) {
+ dev_dbg(dev, "data role swap only supported with DRP ports\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!port->cap->dr_set) {
+ dev_dbg(dev, "data role swapping not supported\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!port->connected)
+ goto out;
+
+ ret = match_string(typec_data_roles, ARRAY_SIZE(typec_data_roles), buf);
+ if (ret < 0)
+ goto out;
+
+ ret = port->cap->dr_set(port->cap, ret);
+ if (ret)
+ goto out;
+
+ ret = size;
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+
+static ssize_t
+current_data_role_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%s\n", typec_data_roles[port->data_role]);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_RW(current_data_role);
+
+static ssize_t supported_data_roles_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ size_t ret;
+
+ mutex_lock(&port->lock);
+
+ if (port->cap->type == TYPEC_PORT_DRP) {
+ ret = sprintf(buf, "host, device\n");
+ goto out;
+ }
+
+ ret = sprintf(buf, "%s\n", typec_data_roles[port->data_role]);
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+static DEVICE_ATTR_RO(supported_data_roles);
+
+static ssize_t current_power_role_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct typec_port *port = to_typec_port(dev);
+ int ret = size;
+
+ mutex_lock(&port->lock);
+
+ if (!port->cap->usb_pd) {
+ dev_dbg(dev, "power role swap only supported with USB PD\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!port->cap->pr_set) {
+ dev_dbg(dev, "power role swapping not supported\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
+ dev_dbg(dev, "partner unable to swap power role\n");
+ ret = -EIO;
+ goto out;
+ }
+
+ if (!port->connected)
+ goto out;
+
+ ret = match_string(typec_roles, ARRAY_SIZE(typec_roles), buf);
+ if (ret < 0)
+ goto out;
+
+ ret = port->cap->pr_set(port->cap, ret);
+ if (ret)
+ goto out;
+
+ ret = size;
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+
+static ssize_t current_power_role_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%s\n", typec_roles[port->pwr_role]);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_RW(current_power_role);
+
+static ssize_t supported_power_roles_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ size_t ret;
+
+ mutex_lock(&port->lock);
+
+ if (port->cap->usb_pd || port->cap->type == TYPEC_PORT_DRP) {
+ ret = sprintf(buf, "source, sink\n");
+ goto out;
+ }
+
+ ret = sprintf(buf, "%s\n", typec_roles[port->pwr_role]);
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+static DEVICE_ATTR_RO(supported_power_roles);
+
+static const char * const typec_pwr_opmodes[] = {
+ [TYPEC_PWR_MODE_USB] = "USB",
+ [TYPEC_PWR_MODE_1_5A] = "USB Type-C 1.5A",
+ [TYPEC_PWR_MODE_3_0A] = "USB Type-C 3.0A",
+ [TYPEC_PWR_MODE_PD] = "USB Power Delivery",
+};
+
+static ssize_t power_operation_mode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_RO(power_operation_mode);
+
+static ssize_t current_vconn_role_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct typec_port *port = to_typec_port(dev);
+ int ret;
+
+ mutex_lock(&port->lock);
+
+ if (!port->cap->usb_pd) {
+ dev_dbg(dev, "vconn swap only supported with USB PD\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!port->cap->vconn_set) {
+ dev_dbg(dev, "vconn swapping not supported\n");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ ret = match_string(typec_roles, ARRAY_SIZE(typec_roles), buf);
+ if (ret < 0)
+ goto out;
+
+ ret = port->cap->vconn_set(port->cap, ret);
+ if (ret)
+ goto out;
+
+ ret = size;
+out:
+ mutex_unlock(&port->lock);
+ return ret;
+}
+
+static ssize_t current_vconn_role_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%s\n", typec_roles[port->vconn_role]);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_RW(current_vconn_role);
+
+static ssize_t supported_accessory_modes_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ enum typec_accessory *accessory;
+ ssize_t ret = 0;
+ int i;
+
+ mutex_lock(&port->lock);
+ if (port->cap->accessory)
+ for (accessory = port->cap->accessory, i = 0;
+ i < port->cap->num_accessory; accessory++, i++)
+ ret += sprintf(buf, "%s\n",
+ typec_accessory_modes[*accessory]);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_RO(supported_accessory_modes);
+
+static ssize_t supports_usb_power_delivery_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct typec_port *port = to_typec_port(dev);
+ ssize_t ret;
+
+ mutex_lock(&port->lock);
+ ret = sprintf(buf, "%d\n", port->cap->usb_pd);
+ mutex_unlock(&port->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_RO(supports_usb_power_delivery);
+
+static struct attribute *typec_attrs[] = {
+ &dev_attr_current_power_role.attr,
+ &dev_attr_current_vconn_role.attr,
+ &dev_attr_current_data_role.attr,
+ &dev_attr_power_operation_mode.attr,
+ &dev_attr_preferred_role.attr,
+ &dev_attr_supported_accessory_modes.attr,
+ &dev_attr_supported_data_roles.attr,
+ &dev_attr_supported_power_roles.attr,
+ &dev_attr_supports_usb_power_delivery.attr,
+ NULL,
+};
+
+static const struct attribute_group typec_group = {
+ .attrs = typec_attrs,
+};
+
+static const struct attribute_group *typec_groups[] = {
+ &typec_group,
+ NULL,
+};
+
+static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ int ret;
+
+ ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
+ if (ret)
+ dev_err(dev, "failed to add uevent TYPEC_PORT\n");
+
+ return ret;
+}
+
+static void typec_release(struct device *dev)
+{
+ struct typec_port *port = to_typec_port(dev);
+
+ ida_simple_remove(&typec_index_ida, port->id);
+ kfree(port);
+}
+
+static struct device_type typec_port_dev_type = {
+ .name = "typec_port",
+ .groups = typec_groups,
+ .uevent = typec_uevent,
+ .release = typec_release,
+};
+
+struct typec_port *typec_register_port(struct device *dev,
+ const struct typec_capability *cap)
+{
+ struct typec_port *port;
+ int ret;
+ int id;
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return ERR_PTR(-ENOMEM);
+
+ id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
+ if (id < 0) {
+ kfree(port);
+ return ERR_PTR(id);
+ }
+
+ /* FIXME: a better approach for this */
+ port->prefer_role = -1;
+
+ port->id = id;
+ port->cap = cap;
+ port->dev.type = &typec_port_dev_type;
+ port->dev.class = &typec_class;
+ port->dev.parent = dev;
+ dev_set_name(&port->dev, "usbc%d", id);
+ mutex_init(&port->lock);
+
+ typec_init_roles(port);
+
+ ret = device_register(&port->dev);
+ if (ret)
+ goto reg_err;
+
+ ret = __typec_register_altmodes(&port->dev, cap->alt_modes, true);
+ if (ret)
+ goto alt_err;
+
+ return port;
+alt_err:
+ device_unregister(&port->dev);
+reg_err:
+ ida_simple_remove(&typec_index_ida, id);
+ put_device(&port->dev);
+ kfree(port);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(typec_register_port);
+
+void typec_unregister_port(struct typec_port *port)
+{
+ struct typec_altmode *alt;
+
+ WARN_ON(port->connected);
+
+ if (port->cap->alt_modes)
+ for (alt = port->cap->alt_modes; alt->svid; alt++)
+ device_unregister(&alt->dev);
+ device_unregister(&port->dev);
+}
+EXPORT_SYMBOL_GPL(typec_unregister_port);
+
+static int __init typec_init(void)
+{
+ return class_register(&typec_class);
+}
+subsys_initcall(typec_init);
+
+static void __exit typec_exit(void)
+{
+ class_unregister(&typec_class);
+}
+module_exit(typec_exit);
+
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("USB Type-C Connector Class");
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
new file mode 100644
index 0000000..eda6747
--- /dev/null
+++ b/include/linux/usb/typec.h
@@ -0,0 +1,260 @@
+
+#ifndef __LINUX_USB_TYPEC_H
+#define __LINUX_USB_TYPEC_H
+
+#include <linux/device.h>
+#include <linux/types.h>
+
+struct typec_port;
+
+enum typec_port_type {
+ TYPEC_PORT_DFP,
+ TYPEC_PORT_UFP,
+ TYPEC_PORT_DRP,
+};
+
+enum typec_partner_type {
+ TYPEC_PARTNER_USB,
+ TYPEC_PARTNER_CHARGER,
+ TYPEC_PARTNER_ALTMODE,
+ TYPEC_PARTNER_ACCESSORY,
+};
+
+enum typec_plug_type {
+ USB_PLUG_NONE,
+ USB_PLUG_TYPE_A,
+ USB_PLUG_TYPE_B,
+ USB_PLUG_TYPE_C,
+ USB_PLUG_CAPTIVE,
+};
+
+enum typec_data_role {
+ TYPEC_DEVICE,
+ TYPEC_HOST,
+};
+
+enum typec_role {
+ TYPEC_SINK,
+ TYPEC_SOURCE,
+};
+
+enum typec_pwr_opmode {
+ TYPEC_PWR_MODE_USB,
+ TYPEC_PWR_MODE_1_5A,
+ TYPEC_PWR_MODE_3_0A,
+ TYPEC_PWR_MODE_PD,
+};
+
+enum typec_accessory {
+ TYPEC_ACCESSORY_NONE,
+ TYPEC_ACCESSORY_AUDIO,
+ TYPEC_ACCESSORY_DEBUG,
+ TYPEC_ACCESSORY_DAUDIO,
+};
+
+/*
+ * struct typec_mode - Individual Mode of an Alternate Mode
+ * @vdo: VDO returned by Discover Modes USB PD command
+ * @desc: Mode description
+ * @active: Tells if the mode is currently entered or not
+ * @index: Index of the mode
+ * @group_name: Name for the sysfs folder in form "mode<index>"
+ * @group: The sysfs group (folder) for the mode
+ * @attrs: The attributes for the sysfs group
+ * @vdo_attr: Device attribute to expose the VDO of the mode
+ * @desc_attr: Device attribute to expose the description of the mode
+ * @active_attr: Device attribute to expose active of the mode
+ * @roles: Only for ports. DRP if the mode is awailable in both roles
+ * @roles_attr: Device attribute, only for ports, to expose the supported roles
+ *
+ * Details about a mode of an Alternate Mode which a connector, cable plug or
+ * partner supports. Every mode will have it's own sysfs group. The details are
+ * the VDO returned by discover modes command, description for the mode and
+ * active flag telling is the mode currently active or not.
+ */
+struct typec_mode {
+ u32 vdo;
+ char *desc;
+ unsigned int active:1;
+ /* Only for ports */
+ enum typec_port_type roles;
+
+ struct typec_altmode *alt_mode;
+
+ int index;
+ char group_name[8];
+ struct attribute_group group;
+ struct attribute *attrs[5];
+ struct device_attribute vdo_attr;
+ struct device_attribute desc_attr;
+ struct device_attribute active_attr;
+ /* Only for ports */
+ struct device_attribute roles_attr;
+};
+
+/*
+ * struct typec_altmode - USB Type-C Alternate Mode
+ * @dev: struct device instance
+ * @name: Name for the Alternate Mode (optional)
+ * @svid: Standard or Vendor ID
+ * @n_modes: Number of modes
+ * @modes: Array of modes supported by the Alternat Mode
+ * @mode_groups: The modes as attribute groups to be exposed in sysfs
+ *
+ * Representation of an Alternate Mode that has SVID assigned by USB-IF. The
+ * array of modes will list the modes of a particular SVID that are supported by
+ * a connector, partner of a cable plug.
+ */
+struct typec_altmode {
+ struct device dev;
+ char *name;
+
+ u16 svid;
+ int n_modes;
+ struct typec_mode *modes;
+
+ const struct attribute_group **mode_groups;
+};
+
+#define to_altmode(d) container_of(d, struct typec_altmode, dev)
+
+struct typec_port *typec_altmode2port(struct typec_altmode *);
+
+void typec_altmode_update_active(struct typec_altmode *alt, int mode,
+ bool active);
+
+int typec_register_altmodes(struct device *, struct typec_altmode *);
+void typec_unregister_altmodes(struct device *);
+
+/*
+ * struct typec_plug - USB Type-C Cable Plug
+ * @dev: struct device instance
+ * @index: 1 for the plug connected to DFP and 2 for the plug connected to UFP
+ * @alt_modes: Alternate Modes the cable plug supports (null terminated)
+ *
+ * Represents USB Type-C Cable Plug.
+ */
+struct typec_plug {
+ struct device dev;
+ int index;
+ struct typec_altmode *alt_modes;
+};
+
+/*
+ * struct typec_cable - USB Type-C Cable
+ * @dev: struct device instance
+ * @type: The plug type from USB PD Cable VDO
+ * @usb_pd: Electronically Marked Cable
+ * @active: Is the cable active or passive
+ * @sop_pp_controller: Tells whether both cable plugs are configurable or not
+ * @plug: The two plugs in the cable.
+ *
+ * Represents USB Type-C Cable attached to USB Type-C port. Two plugs are
+ * created if the cable has SOP Double Prime controller as defined in USB PD
+ * specification. Otherwise only one will be created if the cable is active. For
+ * passive cables no plugs are created.
+ */
+struct typec_cable {
+ struct device dev;
+ enum typec_plug_type type;
+ u32 vdo;
+ unsigned int usb_pd:1;
+ unsigned int active:1;
+ unsigned int sop_pp_controller:1;
+
+ struct typec_plug plug[2];
+};
+
+/*
+ * struct typec_partner - USB Type-C Partner
+ * @dev: struct device instance
+ * @type: Normal USB device, charger, Alternate Mode or Accessory
+ * @usb_pd: USB Power Delivery support
+ * @vdo: VDO returned by Discover Identity USB PD command
+ * @alt_modes: Alternate Modes the partner supports (null terminated)
+ *
+ * Details about a partner that is attached to USB Type-C port.
+ */
+struct typec_partner {
+ struct device dev;
+ enum typec_partner_type type;
+ unsigned int usb_pd:1;
+ u32 vdo;
+ enum typec_accessory accessory;
+ struct typec_altmode *alt_modes;
+};
+
+/*
+ * struct typec_capability - USB Type-C Port Capabilities
+ * @role: DFP (Host-only), UFP (Device-only) or DRP (Dual Role)
+ * @usb_pd: USB Power Delivery support
+ * @accessory: Supported Accessory Modes
+ * @num_accessory: Number of supported Accessory Modes
+ * @alt_modes: Alternate Modes the connector supports (null terminated)
+ * @try_role: Set a fixed data role for DRP port
+ * @dr_set: Set Data Role
+ * @pr_set: Set Power Role
+ * @vconn_set: Set VCONN Role
+ * @activate_mode: Enter/exit given Alternate Mode
+ *
+ * Static capabilities of a single USB Type-C port.
+ */
+struct typec_capability {
+ enum typec_port_type type;
+ unsigned int usb_pd:1;
+ enum typec_accessory *accessory;
+ unsigned int num_accessory;
+ struct typec_altmode *alt_modes;
+
+ int (*try_role)(const struct typec_capability *,
+ enum typec_role);
+
+ int (*dr_set)(const struct typec_capability *,
+ enum typec_data_role);
+ int (*pr_set)(const struct typec_capability *,
+ enum typec_role);
+ int (*vconn_set)(const struct typec_capability *,
+ enum typec_role);
+
+ int (*activate_mode)(struct typec_altmode *,
+ int mode, int activate);
+};
+
+/*
+ * struct typec_connection - Details about USB Type-C port connection event
+ * @partner: The attached partner
+ * @cable: The attached cable
+ * @data_role: Initial USB data role (host or device)
+ * @pwr_role: Initial Power role (source or sink)
+ * @vconn_role: Initial VCONN role (source or sink)
+ * @pwr_opmode: The power mode of the connection
+ *
+ * All the relevant details about a connection event. Wrapper that is passed to
+ * typec_connect(). The context is copied when typec_connect() is called and the
+ * structure is not used for anything else.
+ */
+struct typec_connection {
+ struct typec_partner *partner;
+ struct typec_cable *cable;
+
+ enum typec_data_role data_role;
+ enum typec_role pwr_role;
+ enum typec_role vconn_role;
+ enum typec_pwr_opmode pwr_opmode;
+};
+
+struct typec_port *typec_register_port(struct device *dev,
+ const struct typec_capability *cap);
+void typec_unregister_port(struct typec_port *port);
+
+int typec_connect(struct typec_port *port, struct typec_connection *con);
+void typec_disconnect(struct typec_port *port);
+
+/* Callbacks from driver */
+
+void typec_set_data_role(struct typec_port *, enum typec_data_role);
+void typec_set_pwr_role(struct typec_port *, enum typec_role);
+void typec_set_vconn_role(struct typec_port *, enum typec_role);
+void typec_set_pwr_opmode(struct typec_port *, enum typec_pwr_opmode);
+
+#endif /* __LINUX_USB_TYPEC_H */
--
2.8.1
\
 
 \ /
  Last update: 2016-06-29 16:21    [W:0.155 / U:2.212 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site