// SPDX-License-Identifier: GPL-2.0 /* * USB Type-C Connector Class * * Copyright (C) 2017, Intel Corporation * Author: Heikki Krogerus */ #include #include #include #include #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_match(struct device *dev, const void *name) { return !strcmp((const char *)name, dev_name(dev)); } static void *typec_port_match(struct device_connection *con, int ep, void *data) { return class_find_device(typec_class, NULL, con->endpoint[ep], __typec_port_match); } struct typec_altmode * typec_altmode_register_notifier(struct device *dev, u16 svid, u8 mode, struct notifier_block *nb) { struct typec_device_id id = { svid, mode, }; struct device *altmode_dev; struct device *port_dev; struct altmode *altmode; int ret; /* Find the port linked to the caller */ port_dev = device_connection_find_match(dev, NULL, NULL, typec_port_match); if (IS_ERR_OR_NULL(port_dev)) return port_dev ? ERR_CAST(port_dev) : ERR_PTR(-ENODEV); /* Find the altmode with matching svid */ altmode_dev = device_find_child(port_dev, &id, altmode_match); put_device(port_dev); if (!altmode_dev) return ERR_PTR(-ENODEV); altmode = to_altmode(to_typec_altmode(altmode_dev)); /* Register notifier */ ret = blocking_notifier_chain_register(&altmode->nh, nb); if (ret) { put_device(altmode_dev); return ERR_PTR(ret); } return &altmode->adev; } EXPORT_SYMBOL_GPL(typec_altmode_register_notifier); void typec_altmode_unregister_notifier(struct typec_altmode *adev, struct notifier_block *nb) { struct altmode *altmode = to_altmode(adev); blocking_notifier_chain_unregister(&altmode->nh, nb); put_device(&adev->dev); } EXPORT_SYMBOL_GPL(typec_altmode_unregister_notifier); /** * typec_altmode_update_active - Report Enter/Exit mode * @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)) { 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_pwr_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; char id[10]; sprintf(id, "id%04xm%02x", desc->svid, desc->mode); mux = typec_mux_get(port->dev.parent, id); if (IS_ERR(mux)) return ERR_CAST(mux); adev = typec_register_altmode(&port->dev, desc); if (IS_ERR(adev)) typec_mux_put(mux); else to_altmode(adev)->mux = mux; return adev; } EXPORT_SYMBOL_GPL(typec_port_register_altmode); /** * 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); } port->sw = typec_switch_get(cap->fwnode ? &port->dev : parent); if (IS_ERR(port->sw)) { ret = PTR_ERR(port->sw); goto err_switch; } port->mux = typec_mux_get(parent, "typec-mux"); if (IS_ERR(port->mux)) { ret = PTR_ERR(port->mux); goto err_mux; } 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; 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); ret = device_register(&port->dev); if (ret) { dev_err(parent, "failed to register port (%d)\n", ret); put_device(&port->dev); return ERR_PTR(ret); } return port; err_mux: typec_switch_put(port->sw); err_switch: ida_simple_remove(&typec_index_ida, port->id); kfree(port); return ERR_PTR(ret); } 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; typec_class = class_create(THIS_MODULE, "typec"); if (IS_ERR(typec_class)) { bus_unregister(&typec_bus); return PTR_ERR(typec_class); } return 0; } subsys_initcall(typec_init); static void __exit typec_exit(void) { class_destroy(typec_class); ida_destroy(&typec_index_ida); bus_unregister(&typec_bus); } module_exit(typec_exit); MODULE_AUTHOR("Heikki Krogerus "); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("USB Type-C Connector Class");