blob: a18285a990a88e52770e14841c36ba618ea0ed61 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* USB Type-C Connector Class
*
* Copyright (C) 2017, Intel Corporation
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/slab.h>
#include "bus.h"
struct typec_plug {
struct device dev;
enum typec_plug_index index;
struct ida mode_ids;
};
struct typec_cable {
struct device dev;
enum typec_plug_type type;
struct usb_pd_identity *identity;
unsigned int active:1;
};
struct typec_partner {
struct device dev;
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;
enum typec_role pwr_role;
enum typec_role vconn_role;
enum typec_pwr_opmode pwr_opmode;
enum typec_port_type port_type;
struct mutex port_type_lock;
enum typec_orientation orientation;
struct typec_switch *sw;
struct typec_mux *mux;
const struct typec_capability *cap;
};
#define to_typec_port(_dev_) container_of(_dev_, struct typec_port, dev)
#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)
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;
#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)
static DEFINE_IDA(typec_index_ida);
static struct class *typec_class;
/* ------------------------------------------------------------------------- */
/* Common attributes */
static const char * const typec_accessory_modes[] = {
[TYPEC_ACCESSORY_NONE] = "none",
[TYPEC_ACCESSORY_AUDIO] = "analog_audio",
[TYPEC_ACCESSORY_DEBUG] = "debug",
};
static struct usb_pd_identity *get_pd_identity(struct device *dev)
{
if (is_typec_partner(dev)) {
struct typec_partner *partner = to_typec_partner(dev);
return partner->identity;
} else if (is_typec_cable(dev)) {
struct typec_cable *cable = to_typec_cable(dev);
return cable->identity;
}
return NULL;
}
static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_pd_identity *id = get_pd_identity(dev);
return sprintf(buf, "0x%08x\n", id->id_header);
}
static DEVICE_ATTR_RO(id_header);
static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_pd_identity *id = get_pd_identity(dev);
return sprintf(buf, "0x%08x\n", id->cert_stat);
}
static DEVICE_ATTR_RO(cert_stat);
static ssize_t product_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_pd_identity *id = get_pd_identity(dev);
return sprintf(buf, "0x%08x\n", id->product);
}
static DEVICE_ATTR_RO(product);
static struct attribute *usb_pd_id_attrs[] = {
&dev_attr_id_header.attr,
&dev_attr_cert_stat.attr,
&dev_attr_product.attr,
NULL
};
static const struct attribute_group usb_pd_id_group = {
.name = "identity",
.attrs = usb_pd_id_attrs,
};
static const struct attribute_group *usb_pd_id_groups[] = {
&usb_pd_id_group,
NULL,
};
static void typec_report_identity(struct device *dev)
{
sysfs_notify(&dev->kobj, "identity", "id_header");
sysfs_notify(&dev->kobj, "identity", "cert_stat");
sysfs_notify(&dev->kobj, "identity", "product");
}
/* ------------------------------------------------------------------------- */
/* 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_fwnode_match(struct device *dev, const void *fwnode)
{
return dev_fwnode(dev) == fwnode;
}
static int typec_port_name_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)
{
struct device *dev;
/*
* FIXME: Check does the fwnode supports the requested SVID. If it does
* we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
*/
if (con->fwnode)
return class_find_device(typec_class, NULL, con->fwnode,
typec_port_fwnode_match);
dev = class_find_device(typec_class, NULL, con->endpoint[ep],
typec_port_name_match);
return dev ? dev : ERR_PTR(-EPROBE_DEFER);
}
struct typec_altmode *
typec_altmode_register_notifier(struct device *dev, u16 svid, u8 mode,
struct notifier_block *nb)
{
struct typec_device_id id = { svid, mode, };
struct device *altmode_dev;
struct device *port_dev;
struct altmode *altmode;
int ret;
/* Find the port linked to the caller */
port_dev = device_connection_find_match(dev, NULL, NULL,
typec_port_match);
if (IS_ERR_OR_NULL(port_dev))
return port_dev ? ERR_CAST(port_dev) : ERR_PTR(-ENODEV);
/* Find the altmode with matching svid */
altmode_dev = device_find_child(port_dev, &id, altmode_match);
put_device(port_dev);
if (!altmode_dev)
return ERR_PTR(-ENODEV);
altmode = to_altmode(to_typec_altmode(altmode_dev));
/* Register notifier */
ret = blocking_notifier_chain_register(&altmode->nh, nb);
if (ret) {
put_device(altmode_dev);
return ERR_PTR(ret);
}
return &altmode->adev;
}
EXPORT_SYMBOL_GPL(typec_altmode_register_notifier);
void typec_altmode_unregister_notifier(struct typec_altmode *adev,
struct notifier_block *nb)
{
struct altmode *altmode = to_altmode(adev);
blocking_notifier_chain_unregister(&altmode->nh, nb);
put_device(&adev->dev);
}
EXPORT_SYMBOL_GPL(typec_altmode_unregister_notifier);
/**
* typec_altmode_update_active - Report Enter/Exit mode
* @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 *adev, bool active)
{
char dir[6];
if (adev->active == active)
return;
if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
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);
/**
* typec_altmode2port - Alternate Mode to USB Type-C port
* @alt: The Alternate Mode
*
* Returns handle to the port that a cable plug or partner with @alt is
* connected to.
*/
struct typec_port *typec_altmode2port(struct typec_altmode *alt)
{
if (is_typec_plug(alt->dev.parent))
return to_typec_port(alt->dev.parent->parent->parent);
if (is_typec_partner(alt->dev.parent))
return to_typec_port(alt->dev.parent->parent);
if (is_typec_port(alt->dev.parent))
return to_typec_port(alt->dev.parent);
return NULL;
}
EXPORT_SYMBOL_GPL(typec_altmode2port);
static ssize_t
vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct typec_altmode *alt = to_typec_altmode(dev);
return sprintf(buf, "0x%08x\n", alt->vdo);
}
static DEVICE_ATTR_RO(vdo);
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 ssize_t
active_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct typec_altmode *alt = to_typec_altmode(dev);
return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
}
static ssize_t active_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
struct typec_altmode *adev = to_typec_altmode(dev);
struct altmode *altmode = to_altmode(adev);
bool enter;
int ret;
ret = kstrtobool(buf, &enter);
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;
}
static DEVICE_ATTR_RW(active);
static ssize_t
supported_roles_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct altmode *alt = to_altmode(to_typec_altmode(dev));
ssize_t ret;
switch (alt->roles) {
case TYPEC_PORT_SRC:
ret = sprintf(buf, "source\n");
break;
case TYPEC_PORT_SNK:
ret = sprintf(buf, "sink\n");
break;
case TYPEC_PORT_DRP:
default:
ret = sprintf(buf, "source sink\n");
break;
}
return ret;
}
static DEVICE_ATTR_RO(supported_roles);
static ssize_t
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct typec_altmode *adev = to_typec_altmode(dev);
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)
{
struct typec_altmode *adev = to_typec_altmode(dev);
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 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,
};
static struct typec_altmode *
typec_register_altmode(struct device *parent,
const struct typec_altmode_desc *desc)
{
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->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_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->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->adev.dev);
if (ret) {
dev_err(parent, "failed to register alternate mode (%d)\n",
ret);
put_device(&alt->adev.dev);
return ERR_PTR(ret);
}
return &alt->adev;
}
/**
* typec_unregister_altmode - Unregister Alternate Mode
* @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 *adev)
{
if (IS_ERR_OR_NULL(adev))
return;
typec_mux_put(to_altmode(adev)->mux);
device_unregister(&adev->dev);
}
EXPORT_SYMBOL_GPL(typec_unregister_altmode);
/* ------------------------------------------------------------------------- */
/* Type-C Partners */
static ssize_t accessory_mode_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct typec_partner *p = to_typec_partner(dev);
return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
}
static DEVICE_ATTR_RO(accessory_mode);
static ssize_t supports_usb_power_delivery_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct typec_partner *p = to_typec_partner(dev);
return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
}
static DEVICE_ATTR_RO(supports_usb_power_delivery);
static struct attribute *typec_partner_attrs[] = {
&dev_attr_accessory_mode.attr,
&dev_attr_supports_usb_power_delivery.attr,
NULL
};
ATTRIBUTE_GROUPS(typec_partner);
static void typec_partner_release(struct device *dev)
{
struct typec_partner *partner = to_typec_partner(dev);
ida_destroy(&partner->mode_ids);
kfree(partner);
}
static const struct device_type typec_partner_dev_type = {
.name = "typec_partner",
.groups = typec_partner_groups,
.release = typec_partner_release,
};
/**
* typec_partner_set_identity - Report result from Discover Identity command
* @partner: The partner updated identity values
*
* This routine is used to report that the result of Discover Identity USB power
* delivery command has become available.
*/
int typec_partner_set_identity(struct typec_partner *partner)
{
if (!partner->identity)
return -EINVAL;
typec_report_identity(&partner->dev);
return 0;
}
EXPORT_SYMBOL_GPL(typec_partner_set_identity);
/**
* typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
* @partner: USB Type-C Partner that supports the alternate mode
* @desc: Description of the alternate mode
*
* This routine is used to register each alternate mode individually that
* @partner has listed in response to Discover SVIDs command. The modes for a
* SVID listed in response to Discover Modes command need to be listed in an
* array in @desc.
*
* Returns handle to the alternate mode on success or NULL on failure.
*/
struct typec_altmode *
typec_partner_register_altmode(struct typec_partner *partner,
const struct typec_altmode_desc *desc)
{
return typec_register_altmode(&partner->dev, desc);
}
EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
/**
* typec_register_partner - Register a USB Type-C Partner
* @port: The USB Type-C Port the partner is connected to
* @desc: Description of the partner
*
* Registers a device for USB Type-C Partner described in @desc.
*
* Returns handle to the partner on success or ERR_PTR on failure.
*/
struct typec_partner *typec_register_partner(struct typec_port *port,
struct typec_partner_desc *desc)
{
struct typec_partner *partner;
int ret;
partner = kzalloc(sizeof(*partner), GFP_KERNEL);
if (!partner)
return ERR_PTR(-ENOMEM);
ida_init(&partner->mode_ids);
partner->usb_pd = desc->usb_pd;
partner->accessory = desc->accessory;
if (desc->identity) {
/*
* Creating directory for the identity only if the driver is
* able to provide data to it.
*/
partner->dev.groups = usb_pd_id_groups;
partner->identity = desc->identity;
}
partner->dev.class = typec_class;
partner->dev.parent = &port->dev;
partner->dev.type = &typec_partner_dev_type;
dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
ret = device_register(&partner->dev);
if (ret) {
dev_err(&port->dev, "failed to register partner (%d)\n", ret);
put_device(&partner->dev);
return ERR_PTR(ret);
}
return partner;
}
EXPORT_SYMBOL_GPL(typec_register_partner);
/**
* typec_unregister_partner - Unregister a USB Type-C Partner
* @partner: The partner to be unregistered
*
* Unregister device created with typec_register_partner().
*/
void typec_unregister_partner(struct typec_partner *partner)
{
if (!IS_ERR_OR_NULL(partner))
device_unregister(&partner->dev);
}
EXPORT_SYMBOL_GPL(typec_unregister_partner);
/* ------------------------------------------------------------------------- */
/* Type-C Cable Plugs */
static void typec_plug_release(struct device *dev)
{
struct typec_plug *plug = to_typec_plug(dev);
ida_destroy(&plug->mode_ids);
kfree(plug);
}
static const struct device_type typec_plug_dev_type = {
.name = "typec_plug",
.release = typec_plug_release,
};
/**
* typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
* @plug: USB Type-C Cable Plug that supports the alternate mode
* @desc: Description of the alternate mode
*
* This routine is used to register each alternate mode individually that @plug
* has listed in response to Discover SVIDs command. The modes for a SVID that
* the plug lists in response to Discover Modes command need to be listed in an
* array in @desc.
*
* Returns handle to the alternate mode on success or ERR_PTR on failure.
*/
struct typec_altmode *
typec_plug_register_altmode(struct typec_plug *plug,
const struct typec_altmode_desc *desc)
{
return typec_register_altmode(&plug->dev, desc);
}
EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
/**
* typec_register_plug - Register a USB Type-C Cable Plug
* @cable: USB Type-C Cable with the plug
* @desc: Description of the cable plug
*
* Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
* Cable Plug represents a plug with electronics in it that can response to USB
* Power Delivery SOP Prime or SOP Double Prime packages.
*
* Returns handle to the cable plug on success or ERR_PTR on failure.
*/
struct typec_plug *typec_register_plug(struct typec_cable *cable,
struct typec_plug_desc *desc)
{
struct typec_plug *plug;
char name[8];
int ret;
plug = kzalloc(sizeof(*plug), GFP_KERNEL);
if (!plug)
return ERR_PTR(-ENOMEM);
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;
plug->dev.type = &typec_plug_dev_type;
dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
ret = device_register(&plug->dev);
if (ret) {
dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
put_device(&plug->dev);
return ERR_PTR(ret);
}
return plug;
}
EXPORT_SYMBOL_GPL(typec_register_plug);
/**
* typec_unregister_plug - Unregister a USB Type-C Cable Plug
* @plug: The cable plug to be unregistered
*
* Unregister device created with typec_register_plug().
*/
void typec_unregister_plug(struct typec_plug *plug)
{
if (!IS_ERR_OR_NULL(plug))
device_unregister(&plug->dev);
}
EXPORT_SYMBOL_GPL(typec_unregister_plug);
/* Type-C Cables */
static ssize_t
type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct typec_cable *cable = to_typec_cable(dev);
return sprintf(buf, "%s\n", cable->active ? "active" : "passive");
}
static DEVICE_ATTR_RO(type);
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 plug_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct typec_cable *cable = to_typec_cable(dev);
return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
}
static DEVICE_ATTR_RO(plug_type);
static struct attribute *typec_cable_attrs[] = {
&dev_attr_type.attr,
&dev_attr_plug_type.attr,
NULL
};
ATTRIBUTE_GROUPS(typec_cable);
static void typec_cable_release(struct device *dev)
{
struct typec_cable *cable = to_typec_cable(dev);
kfree(cable);
}
static const struct device_type typec_cable_dev_type = {
.name = "typec_cable",
.groups = typec_cable_groups,
.release = typec_cable_release,
};
/**
* typec_cable_set_identity - Report result from Discover Identity command
* @cable: The cable updated identity values
*
* This routine is used to report that the result of Discover Identity USB power
* delivery command has become available.
*/
int typec_cable_set_identity(struct typec_cable *cable)
{
if (!cable->identity)
return -EINVAL;
typec_report_identity(&cable->dev);
return 0;
}
EXPORT_SYMBOL_GPL(typec_cable_set_identity);
/**
* typec_register_cable - Register a USB Type-C Cable
* @port: The USB Type-C Port the cable is connected to
* @desc: Description of the cable
*
* Registers a device for USB Type-C Cable described in @desc. The cable will be
* parent for the optional cable plug devises.
*
* Returns handle to the cable on success or ERR_PTR on failure.
*/
struct typec_cable *typec_register_cable(struct typec_port *port,
struct typec_cable_desc *desc)
{
struct typec_cable *cable;
int ret;
cable = kzalloc(sizeof(*cable), GFP_KERNEL);
if (!cable)
return ERR_PTR(-ENOMEM);
cable->type = desc->type;
cable->active = desc->active;
if (desc->identity) {
/*
* Creating directory for the identity only if the driver is
* able to provide data to it.
*/
cable->dev.groups = usb_pd_id_groups;
cable->identity = desc->identity;
}
cable->dev.class = typec_class;
cable->dev.parent = &port->dev;
cable->dev.type = &typec_cable_dev_type;
dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
ret = device_register(&cable->dev);
if (ret) {
dev_err(&port->dev, "failed to register cable (%d)\n", ret);
put_device(&cable->dev);
return ERR_PTR(ret);
}
return cable;
}
EXPORT_SYMBOL_GPL(typec_register_cable);
/**
* typec_unregister_cable - Unregister a USB Type-C Cable
* @cable: The cable to be unregistered
*
* Unregister device created with typec_register_cable().
*/
void typec_unregister_cable(struct typec_cable *cable)
{
if (!IS_ERR_OR_NULL(cable))
device_unregister(&cable->dev);
}
EXPORT_SYMBOL_GPL(typec_unregister_cable);
/* ------------------------------------------------------------------------- */
/* USB Type-C ports */
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 const char * const typec_port_power_roles[] = {
[TYPEC_PORT_SRC] = "source",
[TYPEC_PORT_SNK] = "sink",
[TYPEC_PORT_DRP] = "dual",
};
static const char * const typec_port_data_roles[] = {
[TYPEC_PORT_DFP] = "host",
[TYPEC_PORT_UFP] = "device",
[TYPEC_PORT_DRD] = "dual",
};
static const char * const typec_port_types_drp[] = {
[TYPEC_PORT_SRC] = "dual [source] sink",
[TYPEC_PORT_SNK] = "dual source [sink]",
[TYPEC_PORT_DRP] = "[dual] source sink",
};
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);
int role;
int ret;
if (port->cap->type != TYPEC_PORT_DRP) {
dev_dbg(dev, "Preferred role only supported with DRP ports\n");
return -EOPNOTSUPP;
}
if (!port->cap->try_role) {
dev_dbg(dev, "Setting preferred role not supported\n");
return -EOPNOTSUPP;
}
role = sysfs_match_string(typec_roles, buf);
if (role < 0) {
if (sysfs_streq(buf, "none"))
role = TYPEC_NO_PREFERRED_ROLE;
else
return -EINVAL;
}
ret = port->cap->try_role(port->cap, role);
if (ret)
return ret;
port->prefer_role = role;
return size;
}
static ssize_t
preferred_role_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct typec_port *port = to_typec_port(dev);
if (port->cap->type != TYPEC_PORT_DRP)
return 0;
if (port->prefer_role < 0)
return 0;
return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
}
static DEVICE_ATTR_RW(preferred_role);
static ssize_t 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;
if (!port->cap->dr_set) {
dev_dbg(dev, "data role swapping not supported\n");
return -EOPNOTSUPP;
}
ret = sysfs_match_string(typec_data_roles, buf);
if (ret < 0)
return ret;
mutex_lock(&port->port_type_lock);
if (port->cap->data != TYPEC_PORT_DRD) {
ret = -EOPNOTSUPP;
goto unlock_and_ret;
}
ret = port->cap->dr_set(port->cap, ret);
if (ret)
goto unlock_and_ret;
ret = size;
unlock_and_ret:
mutex_unlock(&port->port_type_lock);
return ret;
}
static ssize_t data_role_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct typec_port *port = to_typec_port(dev);
if (port->cap->data == TYPEC_PORT_DRD)
return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
"[host] device" : "host [device]");
return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
}
static DEVICE_ATTR_RW(data_role);
static ssize_t 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;
if (!port->cap->pd_revision) {
dev_dbg(dev, "USB Power Delivery not supported\n");
return -EOPNOTSUPP;
}
if (!port->cap->pr_set) {
dev_dbg(dev, "power role swapping not supported\n");
return -EOPNOTSUPP;
}
if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
dev_dbg(dev, "partner unable to swap power role\n");
return -EIO;
}
ret = sysfs_match_string(typec_roles, buf);
if (ret < 0)
return ret;
mutex_lock(&port->port_type_lock);
if (port->port_type != TYPEC_PORT_DRP) {
dev_dbg(dev, "port type fixed at \"%s\"",
typec_port_power_roles[port->port_type]);
ret = -EOPNOTSUPP;
goto unlock_and_ret;
}
ret = port->cap->pr_set(port->cap, ret);
if (ret)
goto unlock_and_ret;
ret = size;
unlock_and_ret:
mutex_unlock(&port->port_type_lock);
return ret;
}
static ssize_t power_role_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct typec_port *port = to_typec_port(dev);
if (port->cap->type == TYPEC_PORT_DRP)
return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
"[source] sink" : "source [sink]");
return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
}
static DEVICE_ATTR_RW(power_role);
static ssize_t
port_type_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
struct typec_port *port = to_typec_port(dev);
int ret;
enum typec_port_type type;
if (!port->cap->port_type_set || port->cap->type != TYPEC_PORT_DRP) {
dev_dbg(dev, "changing port type not supported\n");
return -EOPNOTSUPP;
}
ret = sysfs_match_string(typec_port_power_roles, buf);
if (ret < 0)
return ret;
type = ret;
mutex_lock(&port->port_type_lock);
if (port->port_type == type) {
ret = size;
goto unlock_and_ret;
}
ret = port->cap->port_type_set(port->cap, type);
if (ret)
goto unlock_and_ret;
port->port_type = type;
ret = size;
unlock_and_ret:
mutex_unlock(&port->port_type_lock);
return ret;
}
static ssize_t
port_type_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct typec_port *port = to_typec_port(dev);
if (port->cap->type == TYPEC_PORT_DRP)
return sprintf(buf, "%s\n",
typec_port_types_drp[port->port_type]);
return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
}
static DEVICE_ATTR_RW(port_type);
static const char * const typec_pwr_opmodes[] = {
[TYPEC_PWR_MODE_USB] = "default",
[TYPEC_PWR_MODE_1_5A] = "1.5A",
[TYPEC_PWR_MODE_3_0A] = "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);
return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
}
static DEVICE_ATTR_RO(power_operation_mode);
static ssize_t vconn_source_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct typec_port *port = to_typec_port(dev);
bool source;
int ret;
if (!port->cap->pd_revision) {
dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
return -EOPNOTSUPP;
}
if (!port->cap->vconn_set) {
dev_dbg(dev, "VCONN swapping not supported\n");
return -EOPNOTSUPP;
}
ret = kstrtobool(buf, &source);
if (ret)
return ret;
ret = port->cap->vconn_set(port->cap, (enum typec_role)source);
if (ret)
return ret;
return size;
}
static ssize_t vconn_source_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct typec_port *port = to_typec_port(dev);
return sprintf(buf, "%s\n",
port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
}
static DEVICE_ATTR_RW(vconn_source);
static ssize_t supported_accessory_modes_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct typec_port *port = to_typec_port(dev);
ssize_t ret = 0;
int i;
for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
if (port->cap->accessory[i])
ret += sprintf(buf + ret, "%s ",
typec_accessory_modes[port->cap->accessory[i]]);
}
if (!ret)
return sprintf(buf, "none\n");
buf[ret - 1] = '\n';
return ret;
}
static DEVICE_ATTR_RO(supported_accessory_modes);
static ssize_t usb_typec_revision_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct typec_port *port = to_typec_port(dev);
u16 rev = port->cap->revision;
return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
}
static DEVICE_ATTR_RO(usb_typec_revision);
static ssize_t usb_power_delivery_revision_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct typec_port *p = to_typec_port(dev);
return sprintf(buf, "%d\n", (p->cap->pd_revision >> 8) & 0xff);
}
static DEVICE_ATTR_RO(usb_power_delivery_revision);
static struct attribute *typec_attrs[] = {
&dev_attr_data_role.attr,
&dev_attr_power_operation_mode.attr,
&dev_attr_power_role.attr,
&dev_attr_preferred_role.attr,
&dev_attr_supported_accessory_modes.attr,
&dev_attr_usb_power_delivery_revision.attr,
&dev_attr_usb_typec_revision.attr,
&dev_attr_vconn_source.attr,
&dev_attr_port_type.attr,
NULL,
};
ATTRIBUTE_GROUPS(typec);
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);
ida_destroy(&port->mode_ids);
typec_switch_put(port->sw);
typec_mux_put(port->mux);
kfree(port);
}
const struct device_type typec_port_dev_type = {
.name = "typec_port",
.groups = typec_groups,
.uevent = typec_uevent,
.release = typec_release,
};
/* --------------------------------------- */
/* Driver callbacks to report role updates */
/**
* typec_set_data_role - Report data role change
* @port: The USB Type-C Port where the role was changed
* @role: The new data role
*
* This routine is used by the port drivers to report data role changes.
*/
void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
{
if (port->data_role == role)
return;
port->data_role = role;
sysfs_notify(&port->dev.kobj, NULL, "data_role");
kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
}
EXPORT_SYMBOL_GPL(typec_set_data_role);
/**
* typec_set_pwr_role - Report power role change
* @port: The USB Type-C Port where the role was changed
* @role: The new data role
*
* This routine is used by the port drivers to report power role changes.
*/
void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
{
if (port->pwr_role == role)
return;
port->pwr_role = role;
sysfs_notify(&port->dev.kobj, NULL, "power_role");
kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
}
EXPORT_SYMBOL_GPL(typec_set_pwr_role);
/**
* typec_set_vconn_role - Report VCONN source change
* @port: The USB Type-C Port which VCONN role changed
* @role: Source when @port is sourcing VCONN, or Sink when it's not
*
* This routine is used by the port drivers to report if the VCONN source is
* changes.
*/
void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
{
if (port->vconn_role == role)
return;
port->vconn_role = role;
sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
}
EXPORT_SYMBOL_GPL(typec_set_vconn_role);
static int partner_match(struct device *dev, void *data)
{
return is_typec_partner(dev);
}
/**
* typec_set_pwr_opmode - Report changed power operation mode
* @port: The USB Type-C Port where the mode was changed
* @opmode: New power operation mode
*
* This routine is used by the port drivers to report changed power operation
* mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
* Type-C specification, and "USB Power Delivery" when the power levels are
* negotiated with methods defined in USB Power Delivery specification.
*/
void typec_set_pwr_opmode(struct typec_port *port,
enum typec_pwr_opmode opmode)
{
struct device *partner_dev;
if (port->pwr_opmode == opmode)
return;
port->pwr_opmode = opmode;
sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
partner_dev = device_find_child(&port->dev, NULL, partner_match);
if (partner_dev) {
struct typec_partner *partner = to_typec_partner(partner_dev);
if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
partner->usb_pd = 1;
sysfs_notify(&partner_dev->kobj, NULL,
"supports_usb_power_delivery");
}
put_device(partner_dev);
}
}
EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
/**
* typec_find_port_power_role - Get the typec port power capability
* @name: port power capability string
*
* This routine is used to find the typec_port_type by its string name.
*
* Returns typec_port_type if success, otherwise negative error code.
*/
int typec_find_port_power_role(const char *name)
{
return match_string(typec_port_power_roles,
ARRAY_SIZE(typec_port_power_roles), name);
}
EXPORT_SYMBOL_GPL(typec_find_port_power_role);
/**
* typec_find_power_role - Find the typec one specific power role
* @name: power role string
*
* This routine is used to find the typec_role by its string name.
*
* Returns typec_role if success, otherwise negative error code.
*/
int typec_find_power_role(const char *name)
{
return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
}
EXPORT_SYMBOL_GPL(typec_find_power_role);
/**
* typec_find_port_data_role - Get the typec port data capability
* @name: port data capability string
*
* This routine is used to find the typec_port_data by its string name.
*
* Returns typec_port_data if success, otherwise negative error code.
*/
int typec_find_port_data_role(const char *name)
{
return match_string(typec_port_data_roles,
ARRAY_SIZE(typec_port_data_roles), name);
}
EXPORT_SYMBOL_GPL(typec_find_port_data_role);
/* ------------------------------------------ */
/* API for Multiplexer/DeMultiplexer Switches */
/**
* typec_set_orientation - Set USB Type-C cable plug orientation
* @port: USB Type-C Port
* @orientation: USB Type-C cable plug orientation
*
* Set cable plug orientation for @port.
*/
int typec_set_orientation(struct typec_port *port,
enum typec_orientation orientation)
{
int ret;
if (port->sw) {
ret = port->sw->set(port->sw, orientation);
if (ret)
return ret;
}
port->orientation = orientation;
return 0;
}
EXPORT_SYMBOL_GPL(typec_set_orientation);
/**
* typec_get_orientation - Get USB Type-C cable plug orientation
* @port: USB Type-C Port
*
* Get current cable plug orientation for @port.
*/
enum typec_orientation typec_get_orientation(struct typec_port *port)
{
return port->orientation;
}
EXPORT_SYMBOL_GPL(typec_get_orientation);
/**
* typec_set_mode - Set mode of operation for USB Type-C connector
* @port: USB Type-C connector
* @mode: Accessory Mode, USB Operation or Safe State
*
* 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)
{
return port->mux ? port->mux->set(port->mux, mode) : 0;
}
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
*
* This routine is used to register an alternate mode that @port is capable of
* supporting.
*
* Returns handle to the alternate mode on success or ERR_PTR on failure.
*/
struct typec_altmode *
typec_port_register_altmode(struct typec_port *port,
const struct typec_altmode_desc *desc)
{
struct typec_altmode *adev;
struct typec_mux *mux;
mux = typec_mux_get(&port->dev, desc);
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);
/**
* typec_register_port - Register a USB Type-C Port
* @parent: Parent device
* @cap: Description of the port
*
* Registers a device for USB Type-C Port described in @cap.
*
* Returns handle to the port on success or ERR_PTR on failure.
*/
struct typec_port *typec_register_port(struct device *parent,
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);
}
switch (cap->type) {
case TYPEC_PORT_SRC:
port->pwr_role = TYPEC_SOURCE;
port->vconn_role = TYPEC_SOURCE;
break;
case TYPEC_PORT_SNK:
port->pwr_role = TYPEC_SINK;
port->vconn_role = TYPEC_SINK;
break;
case TYPEC_PORT_DRP:
if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
port->pwr_role = cap->prefer_role;
else
port->pwr_role = TYPEC_SINK;
break;
}
switch (cap->data) {
case TYPEC_PORT_DFP:
port->data_role = TYPEC_HOST;
break;
case TYPEC_PORT_UFP:
port->data_role = TYPEC_DEVICE;
break;
case TYPEC_PORT_DRD:
if (cap->prefer_role == TYPEC_SOURCE)
port->data_role = TYPEC_HOST;
else
port->data_role = TYPEC_DEVICE;
break;
}
ida_init(&port->mode_ids);
mutex_init(&port->port_type_lock);
port->id = id;
port->cap = cap;
port->port_type = cap->type;
port->prefer_role = cap->prefer_role;
device_initialize(&port->dev);
port->dev.class = typec_class;
port->dev.parent = parent;
port->dev.fwnode = cap->fwnode;
port->dev.type = &typec_port_dev_type;
dev_set_name(&port->dev, "port%d", id);
port->sw = typec_switch_get(&port->dev);
if (IS_ERR(port->sw)) {
put_device(&port->dev);
return ERR_CAST(port->sw);
}
port->mux = typec_mux_get(&port->dev, NULL);
if (IS_ERR(port->mux)) {
put_device(&port->dev);
return ERR_CAST(port->mux);
}
ret = device_add(&port->dev);
if (ret) {
dev_err(parent, "failed to register port (%d)\n", ret);
put_device(&port->dev);
return ERR_PTR(ret);
}
return port;
}
EXPORT_SYMBOL_GPL(typec_register_port);
/**
* typec_unregister_port - Unregister a USB Type-C Port
* @port: The port to be unregistered
*
* Unregister device created with typec_register_port().
*/
void typec_unregister_port(struct typec_port *port)
{
if (!IS_ERR_OR_NULL(port))
device_unregister(&port->dev);
}
EXPORT_SYMBOL_GPL(typec_unregister_port);
static int __init typec_init(void)
{
int ret;
ret = bus_register(&typec_bus);
if (ret)
return ret;
ret = class_register(&typec_mux_class);
if (ret)
goto err_unregister_bus;
typec_class = class_create(THIS_MODULE, "typec");
if (IS_ERR(typec_class)) {
ret = PTR_ERR(typec_class);
goto err_unregister_mux_class;
}
return 0;
err_unregister_mux_class:
class_unregister(&typec_mux_class);
err_unregister_bus:
bus_unregister(&typec_bus);
return ret;
}
subsys_initcall(typec_init);
static void __exit typec_exit(void)
{
class_destroy(typec_class);
ida_destroy(&typec_index_ida);
bus_unregister(&typec_bus);
class_unregister(&typec_mux_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");