// SPDX-License-Identifier: GPL-2.0 /* * USB Type-C Connector Class * * Copyright (C) 2017, Intel Corporation * Author: Heikki Krogerus */ #include #include #include #include #include struct typec_mode { int index; u32 vdo; char *desc; enum typec_port_type roles; struct typec_altmode *alt_mode; unsigned int active:1; char group_name[6]; struct attribute_group group; struct attribute *attrs[5]; struct device_attribute vdo_attr; struct device_attribute desc_attr; struct device_attribute active_attr; struct device_attribute roles_attr; }; struct typec_altmode { struct device dev; u16 svid; int n_modes; struct typec_mode modes[ALTMODE_MAX_MODES]; const struct attribute_group *mode_groups[ALTMODE_MAX_MODES]; }; struct typec_plug { struct device dev; enum typec_plug_index index; }; 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 typec_port { unsigned int id; struct device dev; 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; 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) #define to_altmode(_dev_) container_of(_dev_, struct typec_altmode, dev) static const struct device_type typec_partner_dev_type; static const struct device_type typec_cable_dev_type; static const struct device_type typec_plug_dev_type; static const struct device_type typec_port_dev_type; #define is_typec_partner(_dev_) (_dev_->type == &typec_partner_dev_type) #define is_typec_cable(_dev_) (_dev_->type == &typec_cable_dev_type) #define is_typec_plug(_dev_) (_dev_->type == &typec_plug_dev_type) #define is_typec_port(_dev_) (_dev_->type == &typec_port_dev_type) static DEFINE_IDA(typec_index_ida); static struct class *typec_class; /* 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 */ /** * typec_altmode_update_active - Report Enter/Exit mode * @alt: Handle to the alternate mode * @mode: Mode index * @active: True when the mode has been entered * * If a partner or cable plug executes Enter/Exit Mode command successfully, the * drivers use this routine to report the updated state of the mode. */ void typec_altmode_update_active(struct typec_altmode *alt, int mode, bool active) { struct typec_mode *m = &alt->modes[mode]; char dir[6]; if (m->active == active) return; m->active = active; snprintf(dir, sizeof(dir), "mode%d", mode); sysfs_notify(&alt->dev.kobj, dir, "active"); kobject_uevent(&alt->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 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); return sprintf(buf, "0x%08x\n", mode->vdo); } 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); return sprintf(buf, "%s\n", mode->desc ? mode->desc : ""); } 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); return sprintf(buf, "%s\n", mode->active ? "yes" : "no"); } 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; if (!port->cap->activate_mode) return -EOPNOTSUPP; ret = kstrtobool(buf, &activate); if (ret) return ret; ret = port->cap->activate_mode(port->cap, mode->index, activate); if (ret) return ret; return size; } 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); ssize_t ret; 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; } return ret; } static void typec_init_modes(struct typec_altmode *alt, const struct typec_mode_desc *desc, bool is_port) { int i; for (i = 0; i < alt->n_modes; i++, desc++) { struct typec_mode *mode = &alt->modes[i]; /* Not considering the human readable description critical */ mode->desc = kstrdup(desc->desc, GFP_KERNEL); if (desc->desc && !mode->desc) dev_err(&alt->dev, "failed to copy mode%d desc\n", i); mode->alt_mode = alt; mode->vdo = desc->vdo; mode->roles = desc->roles; mode->index = desc->index; sprintf(mode->group_name, "mode%d", desc->index); sysfs_attr_init(&mode->vdo_attr.attr); mode->vdo_attr.attr.name = "vdo"; mode->vdo_attr.attr.mode = 0444; 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 = 0444; 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 = 0644; 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 = 0444; 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 ssize_t svid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct typec_altmode *alt = to_altmode(dev); return sprintf(buf, "%04x\n", alt->svid); } static DEVICE_ATTR_RO(svid); static struct attribute *typec_altmode_attrs[] = { &dev_attr_svid.attr, NULL }; ATTRIBUTE_GROUPS(typec_altmode); static void typec_altmode_release(struct device *dev) { struct typec_altmode *alt = to_altmode(dev); int i; for (i = 0; i < alt->n_modes; i++) kfree(alt->modes[i].desc); kfree(alt); } static 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) { struct typec_altmode *alt; int ret; alt = kzalloc(sizeof(*alt), GFP_KERNEL); if (!alt) return NULL; alt->svid = desc->svid; alt->n_modes = desc->n_modes; typec_init_modes(alt, desc->modes, is_typec_port(parent)); alt->dev.parent = parent; alt->dev.groups = alt->mode_groups; alt->dev.type = &typec_altmode_dev_type; dev_set_name(&alt->dev, "svid-%04x", alt->svid); ret = device_register(&alt->dev); if (ret) { dev_err(parent, "failed to register alternate mode (%d)\n", ret); put_device(&alt->dev); return NULL; } return alt; } /** * typec_unregister_altmode - Unregister Alternate Mode * @alt: The alternate mode to be unregistered * * Unregister device created with typec_partner_register_altmode(), * typec_plug_register_altmode() or typec_port_register_altmode(). */ void typec_unregister_altmode(struct typec_altmode *alt) { if (alt) device_unregister(&alt->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); 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 NULL 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 NULL; 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 NULL; } 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 (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); 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 NULL 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 NULL 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 NULL; sprintf(name, "plug%d", desc->index); 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 NULL; } 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 (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 NULL 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 NULL; 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 NULL; } 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 (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_types[] = { [TYPEC_PORT_DFP] = "source", [TYPEC_PORT_UFP] = "sink", [TYPEC_PORT_DRP] = "dual", }; static const char * const typec_port_types_drp[] = { [TYPEC_PORT_DFP] = "dual [source] sink", [TYPEC_PORT_UFP] = "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->port_type != TYPEC_PORT_DRP) { dev_dbg(dev, "port type fixed at \"%s\"", typec_port_types[port->port_type]); 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->type == TYPEC_PORT_DRP) 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_types[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_types, 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_types[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); kfree(port); } static 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_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 NULL on failure. */ struct typec_altmode * typec_port_register_altmode(struct typec_port *port, const struct typec_altmode_desc *desc) { return typec_register_altmode(&port->dev, desc); } 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 NULL on failure. */ struct typec_port *typec_register_port(struct device *parent, const struct typec_capability *cap) { struct typec_port *port; int role; int ret; int id; port = kzalloc(sizeof(*port), GFP_KERNEL); if (!port) return NULL; id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL); if (id < 0) { kfree(port); return NULL; } if (cap->type == TYPEC_PORT_DFP) role = TYPEC_SOURCE; else if (cap->type == TYPEC_PORT_UFP) role = TYPEC_SINK; else role = cap->prefer_role; if (role == TYPEC_SOURCE) { port->data_role = TYPEC_HOST; port->pwr_role = TYPEC_SOURCE; port->vconn_role = TYPEC_SOURCE; } else { port->data_role = TYPEC_DEVICE; port->pwr_role = TYPEC_SINK; port->vconn_role = TYPEC_SINK; } port->id = id; port->cap = cap; port->port_type = cap->type; mutex_init(&port->port_type_lock); port->prefer_role = cap->prefer_role; port->dev.class = typec_class; 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 NULL; } 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 (port) device_unregister(&port->dev); } EXPORT_SYMBOL_GPL(typec_unregister_port); static int __init typec_init(void) { typec_class = class_create(THIS_MODULE, "typec"); return PTR_ERR_OR_ZERO(typec_class); } subsys_initcall(typec_init); static void __exit typec_exit(void) { class_destroy(typec_class); ida_destroy(&typec_index_ida); } module_exit(typec_exit); MODULE_AUTHOR("Heikki Krogerus "); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("USB Type-C Connector Class");