1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * USB Type-C Connector Class
   4 *
   5 * Copyright (C) 2017, Intel Corporation
   6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
   7 */
   8
 
   9#include <linux/module.h>
  10#include <linux/mutex.h>
  11#include <linux/property.h>
  12#include <linux/slab.h>
  13#include <linux/usb/pd_vdo.h>
  14#include <linux/usb/typec_mux.h>
  15
  16#include "bus.h"
  17#include "class.h"
  18
  19static DEFINE_IDA(typec_index_ida);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  20
  21struct class typec_class = {
  22	.name = "typec",
  23	.owner = THIS_MODULE,
  24};
  25
  26/* ------------------------------------------------------------------------- */
  27/* Common attributes */
  28
  29static const char * const typec_accessory_modes[] = {
  30	[TYPEC_ACCESSORY_NONE]		= "none",
  31	[TYPEC_ACCESSORY_AUDIO]		= "analog_audio",
  32	[TYPEC_ACCESSORY_DEBUG]		= "debug",
  33};
  34
  35/* Product types defined in USB PD Specification R3.0 V2.0 */
  36static const char * const product_type_ufp[8] = {
  37	[IDH_PTYPE_NOT_UFP]		= "not_ufp",
  38	[IDH_PTYPE_HUB]			= "hub",
  39	[IDH_PTYPE_PERIPH]		= "peripheral",
  40	[IDH_PTYPE_PSD]			= "psd",
  41	[IDH_PTYPE_AMA]			= "ama",
  42};
  43
  44static const char * const product_type_dfp[8] = {
  45	[IDH_PTYPE_NOT_DFP]		= "not_dfp",
  46	[IDH_PTYPE_DFP_HUB]		= "hub",
  47	[IDH_PTYPE_DFP_HOST]		= "host",
  48	[IDH_PTYPE_DFP_PB]		= "power_brick",
  49};
  50
  51static const char * const product_type_cable[8] = {
  52	[IDH_PTYPE_NOT_CABLE]		= "not_cable",
  53	[IDH_PTYPE_PCABLE]		= "passive",
  54	[IDH_PTYPE_ACABLE]		= "active",
  55	[IDH_PTYPE_VPD]			= "vpd",
  56};
  57
  58static struct usb_pd_identity *get_pd_identity(struct device *dev)
  59{
  60	if (is_typec_partner(dev)) {
  61		struct typec_partner *partner = to_typec_partner(dev);
  62
  63		return partner->identity;
  64	} else if (is_typec_cable(dev)) {
  65		struct typec_cable *cable = to_typec_cable(dev);
  66
  67		return cable->identity;
  68	}
  69	return NULL;
  70}
  71
  72static const char *get_pd_product_type(struct device *dev)
  73{
  74	struct typec_port *port = to_typec_port(dev->parent);
  75	struct usb_pd_identity *id = get_pd_identity(dev);
  76	const char *ptype = NULL;
  77
  78	if (is_typec_partner(dev)) {
  79		if (!id)
  80			return NULL;
  81
  82		if (port->data_role == TYPEC_HOST)
  83			ptype = product_type_ufp[PD_IDH_PTYPE(id->id_header)];
  84		else
  85			ptype = product_type_dfp[PD_IDH_DFP_PTYPE(id->id_header)];
  86	} else if (is_typec_cable(dev)) {
  87		if (id)
  88			ptype = product_type_cable[PD_IDH_PTYPE(id->id_header)];
  89		else
  90			ptype = to_typec_cable(dev)->active ?
  91				product_type_cable[IDH_PTYPE_ACABLE] :
  92				product_type_cable[IDH_PTYPE_PCABLE];
  93	}
  94
  95	return ptype;
  96}
  97
  98static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
  99			      char *buf)
 100{
 101	struct usb_pd_identity *id = get_pd_identity(dev);
 102
 103	return sprintf(buf, "0x%08x\n", id->id_header);
 104}
 105static DEVICE_ATTR_RO(id_header);
 106
 107static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
 108			      char *buf)
 109{
 110	struct usb_pd_identity *id = get_pd_identity(dev);
 111
 112	return sprintf(buf, "0x%08x\n", id->cert_stat);
 113}
 114static DEVICE_ATTR_RO(cert_stat);
 115
 116static ssize_t product_show(struct device *dev, struct device_attribute *attr,
 117			    char *buf)
 118{
 119	struct usb_pd_identity *id = get_pd_identity(dev);
 120
 121	return sprintf(buf, "0x%08x\n", id->product);
 122}
 123static DEVICE_ATTR_RO(product);
 124
 125static ssize_t product_type_vdo1_show(struct device *dev, struct device_attribute *attr,
 126				      char *buf)
 127{
 128	struct usb_pd_identity *id = get_pd_identity(dev);
 129
 130	return sysfs_emit(buf, "0x%08x\n", id->vdo[0]);
 131}
 132static DEVICE_ATTR_RO(product_type_vdo1);
 133
 134static ssize_t product_type_vdo2_show(struct device *dev, struct device_attribute *attr,
 135				      char *buf)
 136{
 137	struct usb_pd_identity *id = get_pd_identity(dev);
 138
 139	return sysfs_emit(buf, "0x%08x\n", id->vdo[1]);
 140}
 141static DEVICE_ATTR_RO(product_type_vdo2);
 142
 143static ssize_t product_type_vdo3_show(struct device *dev, struct device_attribute *attr,
 144				      char *buf)
 145{
 146	struct usb_pd_identity *id = get_pd_identity(dev);
 147
 148	return sysfs_emit(buf, "0x%08x\n", id->vdo[2]);
 149}
 150static DEVICE_ATTR_RO(product_type_vdo3);
 151
 152static struct attribute *usb_pd_id_attrs[] = {
 153	&dev_attr_id_header.attr,
 154	&dev_attr_cert_stat.attr,
 155	&dev_attr_product.attr,
 156	&dev_attr_product_type_vdo1.attr,
 157	&dev_attr_product_type_vdo2.attr,
 158	&dev_attr_product_type_vdo3.attr,
 159	NULL
 160};
 161
 162static const struct attribute_group usb_pd_id_group = {
 163	.name = "identity",
 164	.attrs = usb_pd_id_attrs,
 165};
 166
 167static const struct attribute_group *usb_pd_id_groups[] = {
 168	&usb_pd_id_group,
 169	NULL,
 170};
 171
 172static void typec_product_type_notify(struct device *dev)
 173{
 174	char *envp[2] = { };
 175	const char *ptype;
 176
 177	ptype = get_pd_product_type(dev);
 178	if (!ptype)
 179		return;
 180
 181	sysfs_notify(&dev->kobj, NULL, "type");
 182
 183	envp[0] = kasprintf(GFP_KERNEL, "PRODUCT_TYPE=%s", ptype);
 184	if (!envp[0])
 185		return;
 186
 187	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 188	kfree(envp[0]);
 189}
 190
 191static void typec_report_identity(struct device *dev)
 192{
 193	sysfs_notify(&dev->kobj, "identity", "id_header");
 194	sysfs_notify(&dev->kobj, "identity", "cert_stat");
 195	sysfs_notify(&dev->kobj, "identity", "product");
 196	sysfs_notify(&dev->kobj, "identity", "product_type_vdo1");
 197	sysfs_notify(&dev->kobj, "identity", "product_type_vdo2");
 198	sysfs_notify(&dev->kobj, "identity", "product_type_vdo3");
 199	typec_product_type_notify(dev);
 200}
 201
 202static ssize_t
 203type_show(struct device *dev, struct device_attribute *attr, char *buf)
 204{
 205	const char *ptype;
 206
 207	ptype = get_pd_product_type(dev);
 208	if (!ptype)
 209		return 0;
 210
 211	return sysfs_emit(buf, "%s\n", ptype);
 212}
 213static DEVICE_ATTR_RO(type);
 214
 215static ssize_t usb_power_delivery_revision_show(struct device *dev,
 216						struct device_attribute *attr,
 217						char *buf);
 218static DEVICE_ATTR_RO(usb_power_delivery_revision);
 219
 220/* ------------------------------------------------------------------------- */
 221/* Alternate Modes */
 222
 223static int altmode_match(struct device *dev, void *data)
 224{
 225	struct typec_altmode *adev = to_typec_altmode(dev);
 226	struct typec_device_id *id = data;
 227
 228	if (!is_typec_altmode(dev))
 229		return 0;
 230
 231	return ((adev->svid == id->svid) && (adev->mode == id->mode));
 232}
 233
 234static void typec_altmode_set_partner(struct altmode *altmode)
 235{
 236	struct typec_altmode *adev = &altmode->adev;
 237	struct typec_device_id id = { adev->svid, adev->mode, };
 238	struct typec_port *port = typec_altmode2port(adev);
 239	struct altmode *partner;
 240	struct device *dev;
 241
 242	dev = device_find_child(&port->dev, &id, altmode_match);
 243	if (!dev)
 244		return;
 245
 246	/* Bind the port alt mode to the partner/plug alt mode. */
 247	partner = to_altmode(to_typec_altmode(dev));
 248	altmode->partner = partner;
 249
 250	/* Bind the partner/plug alt mode to the port alt mode. */
 251	if (is_typec_plug(adev->dev.parent)) {
 252		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
 253
 254		partner->plug[plug->index] = altmode;
 255	} else {
 256		partner->partner = altmode;
 257	}
 258}
 259
 260static void typec_altmode_put_partner(struct altmode *altmode)
 261{
 262	struct altmode *partner = altmode->partner;
 263	struct typec_altmode *adev;
 264
 265	if (!partner)
 266		return;
 267
 268	adev = &partner->adev;
 269
 270	if (is_typec_plug(adev->dev.parent)) {
 271		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
 272
 273		partner->plug[plug->index] = NULL;
 274	} else {
 275		partner->partner = NULL;
 276	}
 277	put_device(&adev->dev);
 278}
 279
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 280/**
 281 * typec_altmode_update_active - Report Enter/Exit mode
 282 * @adev: Handle to the alternate mode
 283 * @active: True when the mode has been entered
 284 *
 285 * If a partner or cable plug executes Enter/Exit Mode command successfully, the
 286 * drivers use this routine to report the updated state of the mode.
 287 */
 288void typec_altmode_update_active(struct typec_altmode *adev, bool active)
 289{
 290	char dir[6];
 291
 292	if (adev->active == active)
 293		return;
 294
 295	if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
 296		if (!active)
 297			module_put(adev->dev.driver->owner);
 298		else
 299			WARN_ON(!try_module_get(adev->dev.driver->owner));
 300	}
 301
 302	adev->active = active;
 303	snprintf(dir, sizeof(dir), "mode%d", adev->mode);
 304	sysfs_notify(&adev->dev.kobj, dir, "active");
 305	sysfs_notify(&adev->dev.kobj, NULL, "active");
 306	kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
 307}
 308EXPORT_SYMBOL_GPL(typec_altmode_update_active);
 309
 310/**
 311 * typec_altmode2port - Alternate Mode to USB Type-C port
 312 * @alt: The Alternate Mode
 313 *
 314 * Returns handle to the port that a cable plug or partner with @alt is
 315 * connected to.
 316 */
 317struct typec_port *typec_altmode2port(struct typec_altmode *alt)
 318{
 319	if (is_typec_plug(alt->dev.parent))
 320		return to_typec_port(alt->dev.parent->parent->parent);
 321	if (is_typec_partner(alt->dev.parent))
 322		return to_typec_port(alt->dev.parent->parent);
 323	if (is_typec_port(alt->dev.parent))
 324		return to_typec_port(alt->dev.parent);
 325
 326	return NULL;
 327}
 328EXPORT_SYMBOL_GPL(typec_altmode2port);
 329
 330static ssize_t
 331vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
 332{
 333	struct typec_altmode *alt = to_typec_altmode(dev);
 334
 335	return sprintf(buf, "0x%08x\n", alt->vdo);
 336}
 337static DEVICE_ATTR_RO(vdo);
 338
 339static ssize_t
 340description_show(struct device *dev, struct device_attribute *attr, char *buf)
 341{
 342	struct typec_altmode *alt = to_typec_altmode(dev);
 343
 344	return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
 345}
 346static DEVICE_ATTR_RO(description);
 347
 348static ssize_t
 349active_show(struct device *dev, struct device_attribute *attr, char *buf)
 350{
 351	struct typec_altmode *alt = to_typec_altmode(dev);
 352
 353	return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
 354}
 355
 356static ssize_t active_store(struct device *dev, struct device_attribute *attr,
 357			    const char *buf, size_t size)
 358{
 359	struct typec_altmode *adev = to_typec_altmode(dev);
 360	struct altmode *altmode = to_altmode(adev);
 361	bool enter;
 362	int ret;
 363
 364	ret = kstrtobool(buf, &enter);
 365	if (ret)
 366		return ret;
 367
 368	if (adev->active == enter)
 369		return size;
 370
 371	if (is_typec_port(adev->dev.parent)) {
 372		typec_altmode_update_active(adev, enter);
 373
 374		/* Make sure that the partner exits the mode before disabling */
 375		if (altmode->partner && !enter && altmode->partner->adev.active)
 376			typec_altmode_exit(&altmode->partner->adev);
 377	} else if (altmode->partner) {
 378		if (enter && !altmode->partner->adev.active) {
 379			dev_warn(dev, "port has the mode disabled\n");
 380			return -EPERM;
 381		}
 382	}
 383
 384	/* Note: If there is no driver, the mode will not be entered */
 385	if (adev->ops && adev->ops->activate) {
 386		ret = adev->ops->activate(adev, enter);
 387		if (ret)
 388			return ret;
 389	}
 390
 391	return size;
 392}
 393static DEVICE_ATTR_RW(active);
 394
 395static ssize_t
 396supported_roles_show(struct device *dev, struct device_attribute *attr,
 397		     char *buf)
 398{
 399	struct altmode *alt = to_altmode(to_typec_altmode(dev));
 400	ssize_t ret;
 401
 402	switch (alt->roles) {
 403	case TYPEC_PORT_SRC:
 404		ret = sprintf(buf, "source\n");
 405		break;
 406	case TYPEC_PORT_SNK:
 407		ret = sprintf(buf, "sink\n");
 408		break;
 409	case TYPEC_PORT_DRP:
 410	default:
 411		ret = sprintf(buf, "source sink\n");
 412		break;
 413	}
 414	return ret;
 415}
 416static DEVICE_ATTR_RO(supported_roles);
 417
 418static ssize_t
 419mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 420{
 421	struct typec_altmode *adev = to_typec_altmode(dev);
 422
 423	return sprintf(buf, "%u\n", adev->mode);
 424}
 425static DEVICE_ATTR_RO(mode);
 426
 427static ssize_t
 428svid_show(struct device *dev, struct device_attribute *attr, char *buf)
 429{
 430	struct typec_altmode *adev = to_typec_altmode(dev);
 431
 432	return sprintf(buf, "%04x\n", adev->svid);
 433}
 434static DEVICE_ATTR_RO(svid);
 435
 436static struct attribute *typec_altmode_attrs[] = {
 437	&dev_attr_active.attr,
 438	&dev_attr_mode.attr,
 439	&dev_attr_svid.attr,
 440	&dev_attr_vdo.attr,
 441	NULL
 442};
 443
 444static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
 445					     struct attribute *attr, int n)
 446{
 447	struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
 448
 449	if (attr == &dev_attr_active.attr)
 450		if (!adev->ops || !adev->ops->activate)
 451			return 0444;
 452
 453	return attr->mode;
 454}
 455
 456static const struct attribute_group typec_altmode_group = {
 457	.is_visible = typec_altmode_attr_is_visible,
 458	.attrs = typec_altmode_attrs,
 459};
 460
 461static const struct attribute_group *typec_altmode_groups[] = {
 462	&typec_altmode_group,
 463	NULL
 464};
 465
 466static int altmode_id_get(struct device *dev)
 467{
 468	struct ida *ids;
 469
 470	if (is_typec_partner(dev))
 471		ids = &to_typec_partner(dev)->mode_ids;
 472	else if (is_typec_plug(dev))
 473		ids = &to_typec_plug(dev)->mode_ids;
 474	else
 475		ids = &to_typec_port(dev)->mode_ids;
 476
 477	return ida_simple_get(ids, 0, 0, GFP_KERNEL);
 478}
 479
 480static void altmode_id_remove(struct device *dev, int id)
 481{
 482	struct ida *ids;
 483
 484	if (is_typec_partner(dev))
 485		ids = &to_typec_partner(dev)->mode_ids;
 486	else if (is_typec_plug(dev))
 487		ids = &to_typec_plug(dev)->mode_ids;
 488	else
 489		ids = &to_typec_port(dev)->mode_ids;
 490
 491	ida_simple_remove(ids, id);
 492}
 493
 494static void typec_altmode_release(struct device *dev)
 495{
 496	struct altmode *alt = to_altmode(to_typec_altmode(dev));
 497
 498	typec_altmode_put_partner(alt);
 499
 500	altmode_id_remove(alt->adev.dev.parent, alt->id);
 501	kfree(alt);
 502}
 503
 504const struct device_type typec_altmode_dev_type = {
 505	.name = "typec_alternate_mode",
 506	.groups = typec_altmode_groups,
 507	.release = typec_altmode_release,
 508};
 509
 510static struct typec_altmode *
 511typec_register_altmode(struct device *parent,
 512		       const struct typec_altmode_desc *desc)
 513{
 514	unsigned int id = altmode_id_get(parent);
 515	bool is_port = is_typec_port(parent);
 516	struct altmode *alt;
 517	int ret;
 518
 519	alt = kzalloc(sizeof(*alt), GFP_KERNEL);
 520	if (!alt) {
 521		altmode_id_remove(parent, id);
 522		return ERR_PTR(-ENOMEM);
 523	}
 524
 525	alt->adev.svid = desc->svid;
 526	alt->adev.mode = desc->mode;
 527	alt->adev.vdo = desc->vdo;
 528	alt->roles = desc->roles;
 529	alt->id = id;
 530
 531	alt->attrs[0] = &dev_attr_vdo.attr;
 532	alt->attrs[1] = &dev_attr_description.attr;
 533	alt->attrs[2] = &dev_attr_active.attr;
 534
 535	if (is_port) {
 536		alt->attrs[3] = &dev_attr_supported_roles.attr;
 537		alt->adev.active = true; /* Enabled by default */
 538	}
 539
 540	sprintf(alt->group_name, "mode%d", desc->mode);
 541	alt->group.name = alt->group_name;
 542	alt->group.attrs = alt->attrs;
 543	alt->groups[0] = &alt->group;
 544
 545	alt->adev.dev.parent = parent;
 546	alt->adev.dev.groups = alt->groups;
 547	alt->adev.dev.type = &typec_altmode_dev_type;
 548	dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
 549
 550	/* Link partners and plugs with the ports */
 551	if (!is_port)
 
 
 552		typec_altmode_set_partner(alt);
 553
 554	/* The partners are bind to drivers */
 555	if (is_typec_partner(parent))
 556		alt->adev.dev.bus = &typec_bus;
 557
 558	/* Plug alt modes need a class to generate udev events. */
 559	if (is_typec_plug(parent))
 560		alt->adev.dev.class = &typec_class;
 561
 562	ret = device_register(&alt->adev.dev);
 563	if (ret) {
 564		dev_err(parent, "failed to register alternate mode (%d)\n",
 565			ret);
 566		put_device(&alt->adev.dev);
 567		return ERR_PTR(ret);
 568	}
 569
 570	return &alt->adev;
 571}
 572
 573/**
 574 * typec_unregister_altmode - Unregister Alternate Mode
 575 * @adev: The alternate mode to be unregistered
 576 *
 577 * Unregister device created with typec_partner_register_altmode(),
 578 * typec_plug_register_altmode() or typec_port_register_altmode().
 579 */
 580void typec_unregister_altmode(struct typec_altmode *adev)
 581{
 582	if (IS_ERR_OR_NULL(adev))
 583		return;
 584	typec_mux_put(to_altmode(adev)->mux);
 585	device_unregister(&adev->dev);
 586}
 587EXPORT_SYMBOL_GPL(typec_unregister_altmode);
 588
 589/* ------------------------------------------------------------------------- */
 590/* Type-C Partners */
 591
 592static ssize_t accessory_mode_show(struct device *dev,
 593				   struct device_attribute *attr,
 594				   char *buf)
 595{
 596	struct typec_partner *p = to_typec_partner(dev);
 597
 598	return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
 599}
 600static DEVICE_ATTR_RO(accessory_mode);
 601
 602static ssize_t supports_usb_power_delivery_show(struct device *dev,
 603						struct device_attribute *attr,
 604						char *buf)
 605{
 606	struct typec_partner *p = to_typec_partner(dev);
 607
 608	return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
 609}
 610static DEVICE_ATTR_RO(supports_usb_power_delivery);
 611
 612static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr,
 613					      char *buf)
 614{
 615	struct typec_partner *partner;
 616	struct typec_plug *plug;
 617	int num_altmodes;
 618
 619	if (is_typec_partner(dev)) {
 620		partner = to_typec_partner(dev);
 621		num_altmodes = partner->num_altmodes;
 622	} else if (is_typec_plug(dev)) {
 623		plug = to_typec_plug(dev);
 624		num_altmodes = plug->num_altmodes;
 625	} else {
 626		return 0;
 627	}
 628
 629	return sysfs_emit(buf, "%d\n", num_altmodes);
 630}
 631static DEVICE_ATTR_RO(number_of_alternate_modes);
 632
 633static struct attribute *typec_partner_attrs[] = {
 634	&dev_attr_accessory_mode.attr,
 635	&dev_attr_supports_usb_power_delivery.attr,
 636	&dev_attr_number_of_alternate_modes.attr,
 637	&dev_attr_type.attr,
 638	&dev_attr_usb_power_delivery_revision.attr,
 639	NULL
 640};
 641
 642static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
 643{
 644	struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj));
 645
 646	if (attr == &dev_attr_number_of_alternate_modes.attr) {
 647		if (partner->num_altmodes < 0)
 648			return 0;
 649	}
 650
 651	if (attr == &dev_attr_type.attr)
 652		if (!get_pd_product_type(kobj_to_dev(kobj)))
 653			return 0;
 654
 655	return attr->mode;
 656}
 657
 658static const struct attribute_group typec_partner_group = {
 659	.is_visible = typec_partner_attr_is_visible,
 660	.attrs = typec_partner_attrs
 661};
 662
 663static const struct attribute_group *typec_partner_groups[] = {
 664	&typec_partner_group,
 665	NULL
 666};
 
 667
 668static void typec_partner_release(struct device *dev)
 669{
 670	struct typec_partner *partner = to_typec_partner(dev);
 671
 672	ida_destroy(&partner->mode_ids);
 673	kfree(partner);
 674}
 675
 676const struct device_type typec_partner_dev_type = {
 677	.name = "typec_partner",
 678	.groups = typec_partner_groups,
 679	.release = typec_partner_release,
 680};
 681
 682/**
 683 * typec_partner_set_identity - Report result from Discover Identity command
 684 * @partner: The partner updated identity values
 685 *
 686 * This routine is used to report that the result of Discover Identity USB power
 687 * delivery command has become available.
 688 */
 689int typec_partner_set_identity(struct typec_partner *partner)
 690{
 691	if (!partner->identity)
 692		return -EINVAL;
 693
 694	typec_report_identity(&partner->dev);
 695	return 0;
 696}
 697EXPORT_SYMBOL_GPL(typec_partner_set_identity);
 698
 699/**
 700 * typec_partner_set_pd_revision - Set the PD revision supported by the partner
 701 * @partner: The partner to be updated.
 702 * @pd_revision:  USB Power Delivery Specification Revision supported by partner
 703 *
 704 * This routine is used to report that the PD revision of the port partner has
 705 * become available.
 706 */
 707void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision)
 708{
 709	if (partner->pd_revision == pd_revision)
 710		return;
 711
 712	partner->pd_revision = pd_revision;
 713	sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision");
 714	if (pd_revision != 0 && !partner->usb_pd) {
 715		partner->usb_pd = 1;
 716		sysfs_notify(&partner->dev.kobj, NULL,
 717			     "supports_usb_power_delivery");
 718	}
 719	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
 720}
 721EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision);
 722
 723/**
 724 * typec_partner_set_num_altmodes - Set the number of available partner altmodes
 725 * @partner: The partner to be updated.
 726 * @num_altmodes: The number of altmodes we want to specify as available.
 727 *
 728 * This routine is used to report the number of alternate modes supported by the
 729 * partner. This value is *not* enforced in alternate mode registration routines.
 730 *
 731 * @partner.num_altmodes is set to -1 on partner registration, denoting that
 732 * a valid value has not been set for it yet.
 733 *
 734 * Returns 0 on success or negative error number on failure.
 735 */
 736int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes)
 737{
 738	int ret;
 739
 740	if (num_altmodes < 0)
 741		return -EINVAL;
 742
 743	partner->num_altmodes = num_altmodes;
 744	ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group);
 745	if (ret < 0)
 746		return ret;
 747
 748	sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes");
 749	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
 750
 751	return 0;
 752}
 753EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes);
 754
 755/**
 756 * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
 757 * @partner: USB Type-C Partner that supports the alternate mode
 758 * @desc: Description of the alternate mode
 759 *
 760 * This routine is used to register each alternate mode individually that
 761 * @partner has listed in response to Discover SVIDs command. The modes for a
 762 * SVID listed in response to Discover Modes command need to be listed in an
 763 * array in @desc.
 764 *
 765 * Returns handle to the alternate mode on success or ERR_PTR on failure.
 766 */
 767struct typec_altmode *
 768typec_partner_register_altmode(struct typec_partner *partner,
 769			       const struct typec_altmode_desc *desc)
 770{
 771	return typec_register_altmode(&partner->dev, desc);
 772}
 773EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
 774
 775/**
 776 * typec_partner_set_svdm_version - Set negotiated Structured VDM (SVDM) Version
 777 * @partner: USB Type-C Partner that supports SVDM
 778 * @svdm_version: Negotiated SVDM Version
 779 *
 780 * This routine is used to save the negotiated SVDM Version.
 781 */
 782void typec_partner_set_svdm_version(struct typec_partner *partner,
 783				   enum usb_pd_svdm_ver svdm_version)
 784{
 785	partner->svdm_version = svdm_version;
 786}
 787EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version);
 788
 789/**
 790 * typec_register_partner - Register a USB Type-C Partner
 791 * @port: The USB Type-C Port the partner is connected to
 792 * @desc: Description of the partner
 793 *
 794 * Registers a device for USB Type-C Partner described in @desc.
 795 *
 796 * Returns handle to the partner on success or ERR_PTR on failure.
 797 */
 798struct typec_partner *typec_register_partner(struct typec_port *port,
 799					     struct typec_partner_desc *desc)
 800{
 801	struct typec_partner *partner;
 802	int ret;
 803
 804	partner = kzalloc(sizeof(*partner), GFP_KERNEL);
 805	if (!partner)
 806		return ERR_PTR(-ENOMEM);
 807
 808	ida_init(&partner->mode_ids);
 809	partner->usb_pd = desc->usb_pd;
 810	partner->accessory = desc->accessory;
 811	partner->num_altmodes = -1;
 812	partner->pd_revision = desc->pd_revision;
 813	partner->svdm_version = port->cap->svdm_version;
 814
 815	if (desc->identity) {
 816		/*
 817		 * Creating directory for the identity only if the driver is
 818		 * able to provide data to it.
 819		 */
 820		partner->dev.groups = usb_pd_id_groups;
 821		partner->identity = desc->identity;
 822	}
 823
 824	partner->dev.class = &typec_class;
 825	partner->dev.parent = &port->dev;
 826	partner->dev.type = &typec_partner_dev_type;
 827	dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
 828
 829	ret = device_register(&partner->dev);
 830	if (ret) {
 831		dev_err(&port->dev, "failed to register partner (%d)\n", ret);
 832		put_device(&partner->dev);
 833		return ERR_PTR(ret);
 834	}
 835
 836	return partner;
 837}
 838EXPORT_SYMBOL_GPL(typec_register_partner);
 839
 840/**
 841 * typec_unregister_partner - Unregister a USB Type-C Partner
 842 * @partner: The partner to be unregistered
 843 *
 844 * Unregister device created with typec_register_partner().
 845 */
 846void typec_unregister_partner(struct typec_partner *partner)
 847{
 848	if (!IS_ERR_OR_NULL(partner))
 849		device_unregister(&partner->dev);
 850}
 851EXPORT_SYMBOL_GPL(typec_unregister_partner);
 852
 853/* ------------------------------------------------------------------------- */
 854/* Type-C Cable Plugs */
 855
 856static void typec_plug_release(struct device *dev)
 857{
 858	struct typec_plug *plug = to_typec_plug(dev);
 859
 860	ida_destroy(&plug->mode_ids);
 861	kfree(plug);
 862}
 863
 864static struct attribute *typec_plug_attrs[] = {
 865	&dev_attr_number_of_alternate_modes.attr,
 866	NULL
 867};
 868
 869static umode_t typec_plug_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
 870{
 871	struct typec_plug *plug = to_typec_plug(kobj_to_dev(kobj));
 872
 873	if (attr == &dev_attr_number_of_alternate_modes.attr) {
 874		if (plug->num_altmodes < 0)
 875			return 0;
 876	}
 877
 878	return attr->mode;
 879}
 880
 881static const struct attribute_group typec_plug_group = {
 882	.is_visible = typec_plug_attr_is_visible,
 883	.attrs = typec_plug_attrs
 884};
 885
 886static const struct attribute_group *typec_plug_groups[] = {
 887	&typec_plug_group,
 888	NULL
 889};
 890
 891const struct device_type typec_plug_dev_type = {
 892	.name = "typec_plug",
 893	.groups = typec_plug_groups,
 894	.release = typec_plug_release,
 895};
 896
 897/**
 898 * typec_plug_set_num_altmodes - Set the number of available plug altmodes
 899 * @plug: The plug to be updated.
 900 * @num_altmodes: The number of altmodes we want to specify as available.
 901 *
 902 * This routine is used to report the number of alternate modes supported by the
 903 * plug. This value is *not* enforced in alternate mode registration routines.
 904 *
 905 * @plug.num_altmodes is set to -1 on plug registration, denoting that
 906 * a valid value has not been set for it yet.
 907 *
 908 * Returns 0 on success or negative error number on failure.
 909 */
 910int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes)
 911{
 912	int ret;
 913
 914	if (num_altmodes < 0)
 915		return -EINVAL;
 916
 917	plug->num_altmodes = num_altmodes;
 918	ret = sysfs_update_group(&plug->dev.kobj, &typec_plug_group);
 919	if (ret < 0)
 920		return ret;
 921
 922	sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes");
 923	kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE);
 924
 925	return 0;
 926}
 927EXPORT_SYMBOL_GPL(typec_plug_set_num_altmodes);
 928
 929/**
 930 * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
 931 * @plug: USB Type-C Cable Plug that supports the alternate mode
 932 * @desc: Description of the alternate mode
 933 *
 934 * This routine is used to register each alternate mode individually that @plug
 935 * has listed in response to Discover SVIDs command. The modes for a SVID that
 936 * the plug lists in response to Discover Modes command need to be listed in an
 937 * array in @desc.
 938 *
 939 * Returns handle to the alternate mode on success or ERR_PTR on failure.
 940 */
 941struct typec_altmode *
 942typec_plug_register_altmode(struct typec_plug *plug,
 943			    const struct typec_altmode_desc *desc)
 944{
 945	return typec_register_altmode(&plug->dev, desc);
 946}
 947EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
 948
 949/**
 950 * typec_register_plug - Register a USB Type-C Cable Plug
 951 * @cable: USB Type-C Cable with the plug
 952 * @desc: Description of the cable plug
 953 *
 954 * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
 955 * Cable Plug represents a plug with electronics in it that can response to USB
 956 * Power Delivery SOP Prime or SOP Double Prime packages.
 957 *
 958 * Returns handle to the cable plug on success or ERR_PTR on failure.
 959 */
 960struct typec_plug *typec_register_plug(struct typec_cable *cable,
 961				       struct typec_plug_desc *desc)
 962{
 963	struct typec_plug *plug;
 964	char name[8];
 965	int ret;
 966
 967	plug = kzalloc(sizeof(*plug), GFP_KERNEL);
 968	if (!plug)
 969		return ERR_PTR(-ENOMEM);
 970
 971	sprintf(name, "plug%d", desc->index);
 972
 973	ida_init(&plug->mode_ids);
 974	plug->num_altmodes = -1;
 975	plug->index = desc->index;
 976	plug->dev.class = &typec_class;
 977	plug->dev.parent = &cable->dev;
 978	plug->dev.type = &typec_plug_dev_type;
 979	dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
 980
 981	ret = device_register(&plug->dev);
 982	if (ret) {
 983		dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
 984		put_device(&plug->dev);
 985		return ERR_PTR(ret);
 986	}
 987
 988	return plug;
 989}
 990EXPORT_SYMBOL_GPL(typec_register_plug);
 991
 992/**
 993 * typec_unregister_plug - Unregister a USB Type-C Cable Plug
 994 * @plug: The cable plug to be unregistered
 995 *
 996 * Unregister device created with typec_register_plug().
 997 */
 998void typec_unregister_plug(struct typec_plug *plug)
 999{
1000	if (!IS_ERR_OR_NULL(plug))
1001		device_unregister(&plug->dev);
1002}
1003EXPORT_SYMBOL_GPL(typec_unregister_plug);
1004
1005/* Type-C Cables */
1006
 
 
 
 
 
 
 
 
 
1007static const char * const typec_plug_types[] = {
1008	[USB_PLUG_NONE]		= "unknown",
1009	[USB_PLUG_TYPE_A]	= "type-a",
1010	[USB_PLUG_TYPE_B]	= "type-b",
1011	[USB_PLUG_TYPE_C]	= "type-c",
1012	[USB_PLUG_CAPTIVE]	= "captive",
1013};
1014
1015static ssize_t plug_type_show(struct device *dev,
1016			      struct device_attribute *attr, char *buf)
1017{
1018	struct typec_cable *cable = to_typec_cable(dev);
1019
1020	return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
1021}
1022static DEVICE_ATTR_RO(plug_type);
1023
1024static struct attribute *typec_cable_attrs[] = {
1025	&dev_attr_type.attr,
1026	&dev_attr_plug_type.attr,
1027	&dev_attr_usb_power_delivery_revision.attr,
1028	NULL
1029};
1030ATTRIBUTE_GROUPS(typec_cable);
1031
1032static void typec_cable_release(struct device *dev)
1033{
1034	struct typec_cable *cable = to_typec_cable(dev);
1035
1036	kfree(cable);
1037}
1038
1039const struct device_type typec_cable_dev_type = {
1040	.name = "typec_cable",
1041	.groups = typec_cable_groups,
1042	.release = typec_cable_release,
1043};
1044
1045static int cable_match(struct device *dev, void *data)
1046{
1047	return is_typec_cable(dev);
1048}
1049
1050/**
1051 * typec_cable_get - Get a reference to the USB Type-C cable
1052 * @port: The USB Type-C Port the cable is connected to
1053 *
1054 * The caller must decrement the reference count with typec_cable_put() after
1055 * use.
1056 */
1057struct typec_cable *typec_cable_get(struct typec_port *port)
1058{
1059	struct device *dev;
1060
1061	dev = device_find_child(&port->dev, NULL, cable_match);
1062	if (!dev)
1063		return NULL;
1064
1065	return to_typec_cable(dev);
1066}
1067EXPORT_SYMBOL_GPL(typec_cable_get);
1068
1069/**
1070 * typec_cable_put - Decrement the reference count on USB Type-C cable
1071 * @cable: The USB Type-C cable
1072 */
1073void typec_cable_put(struct typec_cable *cable)
1074{
1075	put_device(&cable->dev);
1076}
1077EXPORT_SYMBOL_GPL(typec_cable_put);
1078
1079/**
1080 * typec_cable_is_active - Check is the USB Type-C cable active or passive
1081 * @cable: The USB Type-C Cable
1082 *
1083 * Return 1 if the cable is active or 0 if it's passive.
1084 */
1085int typec_cable_is_active(struct typec_cable *cable)
1086{
1087	return cable->active;
1088}
1089EXPORT_SYMBOL_GPL(typec_cable_is_active);
1090
1091/**
1092 * typec_cable_set_identity - Report result from Discover Identity command
1093 * @cable: The cable updated identity values
1094 *
1095 * This routine is used to report that the result of Discover Identity USB power
1096 * delivery command has become available.
1097 */
1098int typec_cable_set_identity(struct typec_cable *cable)
1099{
1100	if (!cable->identity)
1101		return -EINVAL;
1102
1103	typec_report_identity(&cable->dev);
1104	return 0;
1105}
1106EXPORT_SYMBOL_GPL(typec_cable_set_identity);
1107
1108/**
1109 * typec_register_cable - Register a USB Type-C Cable
1110 * @port: The USB Type-C Port the cable is connected to
1111 * @desc: Description of the cable
1112 *
1113 * Registers a device for USB Type-C Cable described in @desc. The cable will be
1114 * parent for the optional cable plug devises.
1115 *
1116 * Returns handle to the cable on success or ERR_PTR on failure.
1117 */
1118struct typec_cable *typec_register_cable(struct typec_port *port,
1119					 struct typec_cable_desc *desc)
1120{
1121	struct typec_cable *cable;
1122	int ret;
1123
1124	cable = kzalloc(sizeof(*cable), GFP_KERNEL);
1125	if (!cable)
1126		return ERR_PTR(-ENOMEM);
1127
1128	cable->type = desc->type;
1129	cable->active = desc->active;
1130	cable->pd_revision = desc->pd_revision;
1131
1132	if (desc->identity) {
1133		/*
1134		 * Creating directory for the identity only if the driver is
1135		 * able to provide data to it.
1136		 */
1137		cable->dev.groups = usb_pd_id_groups;
1138		cable->identity = desc->identity;
1139	}
1140
1141	cable->dev.class = &typec_class;
1142	cable->dev.parent = &port->dev;
1143	cable->dev.type = &typec_cable_dev_type;
1144	dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
1145
1146	ret = device_register(&cable->dev);
1147	if (ret) {
1148		dev_err(&port->dev, "failed to register cable (%d)\n", ret);
1149		put_device(&cable->dev);
1150		return ERR_PTR(ret);
1151	}
1152
1153	return cable;
1154}
1155EXPORT_SYMBOL_GPL(typec_register_cable);
1156
1157/**
1158 * typec_unregister_cable - Unregister a USB Type-C Cable
1159 * @cable: The cable to be unregistered
1160 *
1161 * Unregister device created with typec_register_cable().
1162 */
1163void typec_unregister_cable(struct typec_cable *cable)
1164{
1165	if (!IS_ERR_OR_NULL(cable))
1166		device_unregister(&cable->dev);
1167}
1168EXPORT_SYMBOL_GPL(typec_unregister_cable);
1169
1170/* ------------------------------------------------------------------------- */
1171/* USB Type-C ports */
1172
1173static const char * const typec_orientations[] = {
1174	[TYPEC_ORIENTATION_NONE]	= "unknown",
1175	[TYPEC_ORIENTATION_NORMAL]	= "normal",
1176	[TYPEC_ORIENTATION_REVERSE]	= "reverse",
1177};
1178
1179static const char * const typec_roles[] = {
1180	[TYPEC_SINK]	= "sink",
1181	[TYPEC_SOURCE]	= "source",
1182};
1183
1184static const char * const typec_data_roles[] = {
1185	[TYPEC_DEVICE]	= "device",
1186	[TYPEC_HOST]	= "host",
1187};
1188
1189static const char * const typec_port_power_roles[] = {
1190	[TYPEC_PORT_SRC] = "source",
1191	[TYPEC_PORT_SNK] = "sink",
1192	[TYPEC_PORT_DRP] = "dual",
1193};
1194
1195static const char * const typec_port_data_roles[] = {
1196	[TYPEC_PORT_DFP] = "host",
1197	[TYPEC_PORT_UFP] = "device",
1198	[TYPEC_PORT_DRD] = "dual",
1199};
1200
1201static const char * const typec_port_types_drp[] = {
1202	[TYPEC_PORT_SRC] = "dual [source] sink",
1203	[TYPEC_PORT_SNK] = "dual source [sink]",
1204	[TYPEC_PORT_DRP] = "[dual] source sink",
1205};
1206
1207static ssize_t
1208preferred_role_store(struct device *dev, struct device_attribute *attr,
1209		     const char *buf, size_t size)
1210{
1211	struct typec_port *port = to_typec_port(dev);
1212	int role;
1213	int ret;
1214
1215	if (port->cap->type != TYPEC_PORT_DRP) {
1216		dev_dbg(dev, "Preferred role only supported with DRP ports\n");
1217		return -EOPNOTSUPP;
1218	}
1219
1220	if (!port->ops || !port->ops->try_role) {
1221		dev_dbg(dev, "Setting preferred role not supported\n");
1222		return -EOPNOTSUPP;
1223	}
1224
1225	role = sysfs_match_string(typec_roles, buf);
1226	if (role < 0) {
1227		if (sysfs_streq(buf, "none"))
1228			role = TYPEC_NO_PREFERRED_ROLE;
1229		else
1230			return -EINVAL;
1231	}
1232
1233	ret = port->ops->try_role(port, role);
1234	if (ret)
1235		return ret;
1236
1237	port->prefer_role = role;
1238	return size;
1239}
1240
1241static ssize_t
1242preferred_role_show(struct device *dev, struct device_attribute *attr,
1243		    char *buf)
1244{
1245	struct typec_port *port = to_typec_port(dev);
1246
1247	if (port->cap->type != TYPEC_PORT_DRP)
1248		return 0;
1249
1250	if (port->prefer_role < 0)
1251		return 0;
1252
1253	return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
1254}
1255static DEVICE_ATTR_RW(preferred_role);
1256
1257static ssize_t data_role_store(struct device *dev,
1258			       struct device_attribute *attr,
1259			       const char *buf, size_t size)
1260{
1261	struct typec_port *port = to_typec_port(dev);
1262	int ret;
1263
1264	if (!port->ops || !port->ops->dr_set) {
1265		dev_dbg(dev, "data role swapping not supported\n");
1266		return -EOPNOTSUPP;
1267	}
1268
1269	ret = sysfs_match_string(typec_data_roles, buf);
1270	if (ret < 0)
1271		return ret;
1272
1273	mutex_lock(&port->port_type_lock);
1274	if (port->cap->data != TYPEC_PORT_DRD) {
1275		ret = -EOPNOTSUPP;
1276		goto unlock_and_ret;
1277	}
1278
1279	ret = port->ops->dr_set(port, ret);
1280	if (ret)
1281		goto unlock_and_ret;
1282
1283	ret = size;
1284unlock_and_ret:
1285	mutex_unlock(&port->port_type_lock);
1286	return ret;
1287}
1288
1289static ssize_t data_role_show(struct device *dev,
1290			      struct device_attribute *attr, char *buf)
1291{
1292	struct typec_port *port = to_typec_port(dev);
1293
1294	if (port->cap->data == TYPEC_PORT_DRD)
1295		return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
1296			       "[host] device" : "host [device]");
1297
1298	return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
1299}
1300static DEVICE_ATTR_RW(data_role);
1301
1302static ssize_t power_role_store(struct device *dev,
1303				struct device_attribute *attr,
1304				const char *buf, size_t size)
1305{
1306	struct typec_port *port = to_typec_port(dev);
1307	int ret;
1308
1309	if (!port->ops || !port->ops->pr_set) {
 
 
 
 
 
1310		dev_dbg(dev, "power role swapping not supported\n");
1311		return -EOPNOTSUPP;
1312	}
1313
1314	if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
1315		dev_dbg(dev, "partner unable to swap power role\n");
1316		return -EIO;
1317	}
1318
1319	ret = sysfs_match_string(typec_roles, buf);
1320	if (ret < 0)
1321		return ret;
1322
1323	mutex_lock(&port->port_type_lock);
1324	if (port->port_type != TYPEC_PORT_DRP) {
1325		dev_dbg(dev, "port type fixed at \"%s\"",
1326			     typec_port_power_roles[port->port_type]);
1327		ret = -EOPNOTSUPP;
1328		goto unlock_and_ret;
1329	}
1330
1331	ret = port->ops->pr_set(port, ret);
1332	if (ret)
1333		goto unlock_and_ret;
1334
1335	ret = size;
1336unlock_and_ret:
1337	mutex_unlock(&port->port_type_lock);
1338	return ret;
1339}
1340
1341static ssize_t power_role_show(struct device *dev,
1342			       struct device_attribute *attr, char *buf)
1343{
1344	struct typec_port *port = to_typec_port(dev);
1345
1346	if (port->cap->type == TYPEC_PORT_DRP)
1347		return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
1348			       "[source] sink" : "source [sink]");
1349
1350	return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
1351}
1352static DEVICE_ATTR_RW(power_role);
1353
1354static ssize_t
1355port_type_store(struct device *dev, struct device_attribute *attr,
1356			const char *buf, size_t size)
1357{
1358	struct typec_port *port = to_typec_port(dev);
1359	int ret;
1360	enum typec_port_type type;
1361
1362	if (port->cap->type != TYPEC_PORT_DRP ||
1363	    !port->ops || !port->ops->port_type_set) {
1364		dev_dbg(dev, "changing port type not supported\n");
1365		return -EOPNOTSUPP;
1366	}
1367
1368	ret = sysfs_match_string(typec_port_power_roles, buf);
1369	if (ret < 0)
1370		return ret;
1371
1372	type = ret;
1373	mutex_lock(&port->port_type_lock);
1374
1375	if (port->port_type == type) {
1376		ret = size;
1377		goto unlock_and_ret;
1378	}
1379
1380	ret = port->ops->port_type_set(port, type);
1381	if (ret)
1382		goto unlock_and_ret;
1383
1384	port->port_type = type;
1385	ret = size;
1386
1387unlock_and_ret:
1388	mutex_unlock(&port->port_type_lock);
1389	return ret;
1390}
1391
1392static ssize_t
1393port_type_show(struct device *dev, struct device_attribute *attr,
1394		char *buf)
1395{
1396	struct typec_port *port = to_typec_port(dev);
1397
1398	if (port->cap->type == TYPEC_PORT_DRP)
1399		return sprintf(buf, "%s\n",
1400			       typec_port_types_drp[port->port_type]);
1401
1402	return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
1403}
1404static DEVICE_ATTR_RW(port_type);
1405
1406static const char * const typec_pwr_opmodes[] = {
1407	[TYPEC_PWR_MODE_USB]	= "default",
1408	[TYPEC_PWR_MODE_1_5A]	= "1.5A",
1409	[TYPEC_PWR_MODE_3_0A]	= "3.0A",
1410	[TYPEC_PWR_MODE_PD]	= "usb_power_delivery",
1411};
1412
1413static ssize_t power_operation_mode_show(struct device *dev,
1414					 struct device_attribute *attr,
1415					 char *buf)
1416{
1417	struct typec_port *port = to_typec_port(dev);
1418
1419	return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
1420}
1421static DEVICE_ATTR_RO(power_operation_mode);
1422
1423static ssize_t vconn_source_store(struct device *dev,
1424				  struct device_attribute *attr,
1425				  const char *buf, size_t size)
1426{
1427	struct typec_port *port = to_typec_port(dev);
1428	bool source;
1429	int ret;
1430
1431	if (!port->cap->pd_revision) {
1432		dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
1433		return -EOPNOTSUPP;
1434	}
1435
1436	if (!port->ops || !port->ops->vconn_set) {
1437		dev_dbg(dev, "VCONN swapping not supported\n");
1438		return -EOPNOTSUPP;
1439	}
1440
1441	ret = kstrtobool(buf, &source);
1442	if (ret)
1443		return ret;
1444
1445	ret = port->ops->vconn_set(port, (enum typec_role)source);
1446	if (ret)
1447		return ret;
1448
1449	return size;
1450}
1451
1452static ssize_t vconn_source_show(struct device *dev,
1453				 struct device_attribute *attr, char *buf)
1454{
1455	struct typec_port *port = to_typec_port(dev);
1456
1457	return sprintf(buf, "%s\n",
1458		       port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
1459}
1460static DEVICE_ATTR_RW(vconn_source);
1461
1462static ssize_t supported_accessory_modes_show(struct device *dev,
1463					      struct device_attribute *attr,
1464					      char *buf)
1465{
1466	struct typec_port *port = to_typec_port(dev);
1467	ssize_t ret = 0;
1468	int i;
1469
1470	for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
1471		if (port->cap->accessory[i])
1472			ret += sprintf(buf + ret, "%s ",
1473			       typec_accessory_modes[port->cap->accessory[i]]);
1474	}
1475
1476	if (!ret)
1477		return sprintf(buf, "none\n");
1478
1479	buf[ret - 1] = '\n';
1480
1481	return ret;
1482}
1483static DEVICE_ATTR_RO(supported_accessory_modes);
1484
1485static ssize_t usb_typec_revision_show(struct device *dev,
1486				       struct device_attribute *attr,
1487				       char *buf)
1488{
1489	struct typec_port *port = to_typec_port(dev);
1490	u16 rev = port->cap->revision;
1491
1492	return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1493}
1494static DEVICE_ATTR_RO(usb_typec_revision);
1495
1496static ssize_t usb_power_delivery_revision_show(struct device *dev,
1497						struct device_attribute *attr,
1498						char *buf)
1499{
1500	u16 rev = 0;
1501
1502	if (is_typec_partner(dev)) {
1503		struct typec_partner *partner = to_typec_partner(dev);
1504
1505		rev = partner->pd_revision;
1506	} else if (is_typec_cable(dev)) {
1507		struct typec_cable *cable = to_typec_cable(dev);
1508
1509		rev = cable->pd_revision;
1510	} else if (is_typec_port(dev)) {
1511		struct typec_port *p = to_typec_port(dev);
1512
1513		rev = p->cap->pd_revision;
1514	}
1515	return sysfs_emit(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1516}
1517
1518static ssize_t orientation_show(struct device *dev,
1519				   struct device_attribute *attr,
1520				   char *buf)
1521{
1522	struct typec_port *port = to_typec_port(dev);
1523
1524	return sprintf(buf, "%s\n", typec_orientations[port->orientation]);
1525}
1526static DEVICE_ATTR_RO(orientation);
1527
1528static struct attribute *typec_attrs[] = {
1529	&dev_attr_data_role.attr,
1530	&dev_attr_power_operation_mode.attr,
1531	&dev_attr_power_role.attr,
1532	&dev_attr_preferred_role.attr,
1533	&dev_attr_supported_accessory_modes.attr,
1534	&dev_attr_usb_power_delivery_revision.attr,
1535	&dev_attr_usb_typec_revision.attr,
1536	&dev_attr_vconn_source.attr,
1537	&dev_attr_port_type.attr,
1538	&dev_attr_orientation.attr,
1539	NULL,
1540};
1541
1542static umode_t typec_attr_is_visible(struct kobject *kobj,
1543				     struct attribute *attr, int n)
1544{
1545	struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1546
1547	if (attr == &dev_attr_data_role.attr) {
1548		if (port->cap->data != TYPEC_PORT_DRD ||
1549		    !port->ops || !port->ops->dr_set)
1550			return 0444;
1551	} else if (attr == &dev_attr_power_role.attr) {
1552		if (port->cap->type != TYPEC_PORT_DRP ||
1553		    !port->ops || !port->ops->pr_set)
1554			return 0444;
1555	} else if (attr == &dev_attr_vconn_source.attr) {
1556		if (!port->cap->pd_revision ||
1557		    !port->ops || !port->ops->vconn_set)
1558			return 0444;
1559	} else if (attr == &dev_attr_preferred_role.attr) {
1560		if (port->cap->type != TYPEC_PORT_DRP ||
1561		    !port->ops || !port->ops->try_role)
1562			return 0444;
1563	} else if (attr == &dev_attr_port_type.attr) {
1564		if (!port->ops || !port->ops->port_type_set)
1565			return 0;
1566		if (port->cap->type != TYPEC_PORT_DRP)
1567			return 0444;
1568	} else if (attr == &dev_attr_orientation.attr) {
1569		if (port->cap->orientation_aware)
1570			return 0444;
1571		return 0;
1572	}
1573
1574	return attr->mode;
1575}
1576
1577static const struct attribute_group typec_group = {
1578	.is_visible = typec_attr_is_visible,
1579	.attrs = typec_attrs,
1580};
1581
1582static const struct attribute_group *typec_groups[] = {
1583	&typec_group,
1584	NULL
1585};
1586
1587static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
1588{
1589	int ret;
1590
1591	ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
1592	if (ret)
1593		dev_err(dev, "failed to add uevent TYPEC_PORT\n");
1594
1595	return ret;
1596}
1597
1598static void typec_release(struct device *dev)
1599{
1600	struct typec_port *port = to_typec_port(dev);
1601
1602	ida_simple_remove(&typec_index_ida, port->id);
1603	ida_destroy(&port->mode_ids);
1604	typec_switch_put(port->sw);
1605	typec_mux_put(port->mux);
1606	kfree(port->cap);
1607	kfree(port);
1608}
1609
1610const struct device_type typec_port_dev_type = {
1611	.name = "typec_port",
1612	.groups = typec_groups,
1613	.uevent = typec_uevent,
1614	.release = typec_release,
1615};
1616
1617/* --------------------------------------- */
1618/* Driver callbacks to report role updates */
1619
1620static int partner_match(struct device *dev, void *data)
1621{
1622	return is_typec_partner(dev);
1623}
1624
1625/**
1626 * typec_set_data_role - Report data role change
1627 * @port: The USB Type-C Port where the role was changed
1628 * @role: The new data role
1629 *
1630 * This routine is used by the port drivers to report data role changes.
1631 */
1632void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
1633{
1634	struct device *partner_dev;
1635
1636	if (port->data_role == role)
1637		return;
1638
1639	port->data_role = role;
1640	sysfs_notify(&port->dev.kobj, NULL, "data_role");
1641	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1642
1643	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1644	if (!partner_dev)
1645		return;
1646
1647	if (to_typec_partner(partner_dev)->identity)
1648		typec_product_type_notify(partner_dev);
1649
1650	put_device(partner_dev);
1651}
1652EXPORT_SYMBOL_GPL(typec_set_data_role);
1653
1654/**
1655 * typec_set_pwr_role - Report power role change
1656 * @port: The USB Type-C Port where the role was changed
1657 * @role: The new data role
1658 *
1659 * This routine is used by the port drivers to report power role changes.
1660 */
1661void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
1662{
1663	if (port->pwr_role == role)
1664		return;
1665
1666	port->pwr_role = role;
1667	sysfs_notify(&port->dev.kobj, NULL, "power_role");
1668	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1669}
1670EXPORT_SYMBOL_GPL(typec_set_pwr_role);
1671
1672/**
1673 * typec_set_vconn_role - Report VCONN source change
1674 * @port: The USB Type-C Port which VCONN role changed
1675 * @role: Source when @port is sourcing VCONN, or Sink when it's not
1676 *
1677 * This routine is used by the port drivers to report if the VCONN source is
1678 * changes.
1679 */
1680void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
1681{
1682	if (port->vconn_role == role)
1683		return;
1684
1685	port->vconn_role = role;
1686	sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
1687	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1688}
1689EXPORT_SYMBOL_GPL(typec_set_vconn_role);
1690
 
 
 
 
 
1691/**
1692 * typec_set_pwr_opmode - Report changed power operation mode
1693 * @port: The USB Type-C Port where the mode was changed
1694 * @opmode: New power operation mode
1695 *
1696 * This routine is used by the port drivers to report changed power operation
1697 * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
1698 * Type-C specification, and "USB Power Delivery" when the power levels are
1699 * negotiated with methods defined in USB Power Delivery specification.
1700 */
1701void typec_set_pwr_opmode(struct typec_port *port,
1702			  enum typec_pwr_opmode opmode)
1703{
1704	struct device *partner_dev;
1705
1706	if (port->pwr_opmode == opmode)
1707		return;
1708
1709	port->pwr_opmode = opmode;
1710	sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
1711	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1712
1713	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1714	if (partner_dev) {
1715		struct typec_partner *partner = to_typec_partner(partner_dev);
1716
1717		if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
1718			partner->usb_pd = 1;
1719			sysfs_notify(&partner_dev->kobj, NULL,
1720				     "supports_usb_power_delivery");
1721		}
1722		put_device(partner_dev);
1723	}
1724}
1725EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
1726
1727/**
1728 * typec_find_pwr_opmode - Get the typec power operation mode capability
1729 * @name: power operation mode string
1730 *
1731 * This routine is used to find the typec_pwr_opmode by its string @name.
1732 *
1733 * Returns typec_pwr_opmode if success, otherwise negative error code.
1734 */
1735int typec_find_pwr_opmode(const char *name)
1736{
1737	return match_string(typec_pwr_opmodes,
1738			    ARRAY_SIZE(typec_pwr_opmodes), name);
1739}
1740EXPORT_SYMBOL_GPL(typec_find_pwr_opmode);
1741
1742/**
1743 * typec_find_orientation - Convert orientation string to enum typec_orientation
1744 * @name: Orientation string
1745 *
1746 * This routine is used to find the typec_orientation by its string name @name.
1747 *
1748 * Returns the orientation value on success, otherwise negative error code.
1749 */
1750int typec_find_orientation(const char *name)
1751{
1752	return match_string(typec_orientations, ARRAY_SIZE(typec_orientations),
1753			    name);
1754}
1755EXPORT_SYMBOL_GPL(typec_find_orientation);
1756
1757/**
1758 * typec_find_port_power_role - Get the typec port power capability
1759 * @name: port power capability string
1760 *
1761 * This routine is used to find the typec_port_type by its string name.
1762 *
1763 * Returns typec_port_type if success, otherwise negative error code.
1764 */
1765int typec_find_port_power_role(const char *name)
1766{
1767	return match_string(typec_port_power_roles,
1768			    ARRAY_SIZE(typec_port_power_roles), name);
1769}
1770EXPORT_SYMBOL_GPL(typec_find_port_power_role);
1771
1772/**
1773 * typec_find_power_role - Find the typec one specific power role
1774 * @name: power role string
1775 *
1776 * This routine is used to find the typec_role by its string name.
1777 *
1778 * Returns typec_role if success, otherwise negative error code.
1779 */
1780int typec_find_power_role(const char *name)
1781{
1782	return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
1783}
1784EXPORT_SYMBOL_GPL(typec_find_power_role);
1785
1786/**
1787 * typec_find_port_data_role - Get the typec port data capability
1788 * @name: port data capability string
1789 *
1790 * This routine is used to find the typec_port_data by its string name.
1791 *
1792 * Returns typec_port_data if success, otherwise negative error code.
1793 */
1794int typec_find_port_data_role(const char *name)
1795{
1796	return match_string(typec_port_data_roles,
1797			    ARRAY_SIZE(typec_port_data_roles), name);
1798}
1799EXPORT_SYMBOL_GPL(typec_find_port_data_role);
1800
1801/* ------------------------------------------ */
1802/* API for Multiplexer/DeMultiplexer Switches */
1803
1804/**
1805 * typec_set_orientation - Set USB Type-C cable plug orientation
1806 * @port: USB Type-C Port
1807 * @orientation: USB Type-C cable plug orientation
1808 *
1809 * Set cable plug orientation for @port.
1810 */
1811int typec_set_orientation(struct typec_port *port,
1812			  enum typec_orientation orientation)
1813{
1814	int ret;
1815
1816	ret = typec_switch_set(port->sw, orientation);
1817	if (ret)
1818		return ret;
 
 
1819
1820	port->orientation = orientation;
1821	sysfs_notify(&port->dev.kobj, NULL, "orientation");
1822	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1823
1824	return 0;
1825}
1826EXPORT_SYMBOL_GPL(typec_set_orientation);
1827
1828/**
1829 * typec_get_orientation - Get USB Type-C cable plug orientation
1830 * @port: USB Type-C Port
1831 *
1832 * Get current cable plug orientation for @port.
1833 */
1834enum typec_orientation typec_get_orientation(struct typec_port *port)
1835{
1836	return port->orientation;
1837}
1838EXPORT_SYMBOL_GPL(typec_get_orientation);
1839
1840/**
1841 * typec_set_mode - Set mode of operation for USB Type-C connector
1842 * @port: USB Type-C connector
1843 * @mode: Accessory Mode, USB Operation or Safe State
1844 *
1845 * Configure @port for Accessory Mode @mode. This function will configure the
1846 * muxes needed for @mode.
1847 */
1848int typec_set_mode(struct typec_port *port, int mode)
1849{
1850	struct typec_mux_state state = { };
1851
1852	state.mode = mode;
1853
1854	return typec_mux_set(port->mux, &state);
1855}
1856EXPORT_SYMBOL_GPL(typec_set_mode);
1857
1858/* --------------------------------------- */
1859
1860/**
1861 * typec_get_negotiated_svdm_version - Get negotiated SVDM Version
1862 * @port: USB Type-C Port.
1863 *
1864 * Get the negotiated SVDM Version. The Version is set to the port default
1865 * value stored in typec_capability on partner registration, and updated after
1866 * a successful Discover Identity if the negotiated value is less than the
1867 * default value.
1868 *
1869 * Returns usb_pd_svdm_ver if the partner has been registered otherwise -ENODEV.
1870 */
1871int typec_get_negotiated_svdm_version(struct typec_port *port)
1872{
1873	enum usb_pd_svdm_ver svdm_version;
1874	struct device *partner_dev;
1875
1876	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1877	if (!partner_dev)
1878		return -ENODEV;
1879
1880	svdm_version = to_typec_partner(partner_dev)->svdm_version;
1881	put_device(partner_dev);
1882
1883	return svdm_version;
1884}
1885EXPORT_SYMBOL_GPL(typec_get_negotiated_svdm_version);
1886
1887/**
1888 * typec_get_drvdata - Return private driver data pointer
1889 * @port: USB Type-C port
1890 */
1891void *typec_get_drvdata(struct typec_port *port)
1892{
1893	return dev_get_drvdata(&port->dev);
1894}
1895EXPORT_SYMBOL_GPL(typec_get_drvdata);
1896
1897/**
1898 * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
1899 * @port: USB Type-C Port that supports the alternate mode
1900 * @desc: Description of the alternate mode
1901 *
1902 * This routine is used to register an alternate mode that @port is capable of
1903 * supporting.
1904 *
1905 * Returns handle to the alternate mode on success or ERR_PTR on failure.
1906 */
1907struct typec_altmode *
1908typec_port_register_altmode(struct typec_port *port,
1909			    const struct typec_altmode_desc *desc)
1910{
1911	struct typec_altmode *adev;
1912	struct typec_mux *mux;
1913
1914	mux = typec_mux_get(&port->dev, desc);
1915	if (IS_ERR(mux))
1916		return ERR_CAST(mux);
1917
1918	adev = typec_register_altmode(&port->dev, desc);
1919	if (IS_ERR(adev))
1920		typec_mux_put(mux);
1921	else
1922		to_altmode(adev)->mux = mux;
1923
1924	return adev;
1925}
1926EXPORT_SYMBOL_GPL(typec_port_register_altmode);
1927
1928void typec_port_register_altmodes(struct typec_port *port,
1929	const struct typec_altmode_ops *ops, void *drvdata,
1930	struct typec_altmode **altmodes, size_t n)
1931{
1932	struct fwnode_handle *altmodes_node, *child;
1933	struct typec_altmode_desc desc;
1934	struct typec_altmode *alt;
1935	size_t index = 0;
1936	u32 svid, vdo;
1937	int ret;
1938
1939	altmodes_node = device_get_named_child_node(&port->dev, "altmodes");
1940	if (!altmodes_node)
1941		return; /* No altmodes specified */
1942
1943	fwnode_for_each_child_node(altmodes_node, child) {
1944		ret = fwnode_property_read_u32(child, "svid", &svid);
1945		if (ret) {
1946			dev_err(&port->dev, "Error reading svid for altmode %s\n",
1947				fwnode_get_name(child));
1948			continue;
1949		}
1950
1951		ret = fwnode_property_read_u32(child, "vdo", &vdo);
1952		if (ret) {
1953			dev_err(&port->dev, "Error reading vdo for altmode %s\n",
1954				fwnode_get_name(child));
1955			continue;
1956		}
1957
1958		if (index >= n) {
1959			dev_err(&port->dev, "Error not enough space for altmode %s\n",
1960				fwnode_get_name(child));
1961			continue;
1962		}
1963
1964		desc.svid = svid;
1965		desc.vdo = vdo;
1966		desc.mode = index + 1;
1967		alt = typec_port_register_altmode(port, &desc);
1968		if (IS_ERR(alt)) {
1969			dev_err(&port->dev, "Error registering altmode %s\n",
1970				fwnode_get_name(child));
1971			continue;
1972		}
1973
1974		alt->ops = ops;
1975		typec_altmode_set_drvdata(alt, drvdata);
1976		altmodes[index] = alt;
1977		index++;
1978	}
1979}
1980EXPORT_SYMBOL_GPL(typec_port_register_altmodes);
1981
1982/**
1983 * typec_register_port - Register a USB Type-C Port
1984 * @parent: Parent device
1985 * @cap: Description of the port
1986 *
1987 * Registers a device for USB Type-C Port described in @cap.
1988 *
1989 * Returns handle to the port on success or ERR_PTR on failure.
1990 */
1991struct typec_port *typec_register_port(struct device *parent,
1992				       const struct typec_capability *cap)
1993{
1994	struct typec_port *port;
1995	int ret;
1996	int id;
1997
1998	port = kzalloc(sizeof(*port), GFP_KERNEL);
1999	if (!port)
2000		return ERR_PTR(-ENOMEM);
2001
2002	id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
2003	if (id < 0) {
2004		kfree(port);
2005		return ERR_PTR(id);
2006	}
2007
2008	switch (cap->type) {
2009	case TYPEC_PORT_SRC:
2010		port->pwr_role = TYPEC_SOURCE;
2011		port->vconn_role = TYPEC_SOURCE;
2012		break;
2013	case TYPEC_PORT_SNK:
2014		port->pwr_role = TYPEC_SINK;
2015		port->vconn_role = TYPEC_SINK;
2016		break;
2017	case TYPEC_PORT_DRP:
2018		if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
2019			port->pwr_role = cap->prefer_role;
2020		else
2021			port->pwr_role = TYPEC_SINK;
2022		break;
2023	}
2024
2025	switch (cap->data) {
2026	case TYPEC_PORT_DFP:
2027		port->data_role = TYPEC_HOST;
2028		break;
2029	case TYPEC_PORT_UFP:
2030		port->data_role = TYPEC_DEVICE;
2031		break;
2032	case TYPEC_PORT_DRD:
2033		if (cap->prefer_role == TYPEC_SOURCE)
2034			port->data_role = TYPEC_HOST;
2035		else
2036			port->data_role = TYPEC_DEVICE;
2037		break;
2038	}
2039
2040	ida_init(&port->mode_ids);
2041	mutex_init(&port->port_type_lock);
2042	mutex_init(&port->port_list_lock);
2043	INIT_LIST_HEAD(&port->port_list);
2044
2045	port->id = id;
2046	port->ops = cap->ops;
2047	port->port_type = cap->type;
2048	port->prefer_role = cap->prefer_role;
2049
2050	device_initialize(&port->dev);
2051	port->dev.class = &typec_class;
2052	port->dev.parent = parent;
2053	port->dev.fwnode = cap->fwnode;
2054	port->dev.type = &typec_port_dev_type;
2055	dev_set_name(&port->dev, "port%d", id);
2056	dev_set_drvdata(&port->dev, cap->driver_data);
2057
2058	port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
2059	if (!port->cap) {
2060		put_device(&port->dev);
2061		return ERR_PTR(-ENOMEM);
2062	}
2063
2064	port->sw = typec_switch_get(&port->dev);
2065	if (IS_ERR(port->sw)) {
2066		ret = PTR_ERR(port->sw);
2067		put_device(&port->dev);
2068		return ERR_PTR(ret);
2069	}
2070
2071	port->mux = typec_mux_get(&port->dev, NULL);
2072	if (IS_ERR(port->mux)) {
2073		ret = PTR_ERR(port->mux);
2074		put_device(&port->dev);
2075		return ERR_PTR(ret);
2076	}
2077
2078	ret = device_add(&port->dev);
2079	if (ret) {
2080		dev_err(parent, "failed to register port (%d)\n", ret);
2081		put_device(&port->dev);
2082		return ERR_PTR(ret);
2083	}
2084
2085	ret = typec_link_ports(port);
2086	if (ret)
2087		dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret);
2088
2089	return port;
2090}
2091EXPORT_SYMBOL_GPL(typec_register_port);
2092
2093/**
2094 * typec_unregister_port - Unregister a USB Type-C Port
2095 * @port: The port to be unregistered
2096 *
2097 * Unregister device created with typec_register_port().
2098 */
2099void typec_unregister_port(struct typec_port *port)
2100{
2101	if (!IS_ERR_OR_NULL(port)) {
2102		typec_unlink_ports(port);
2103		device_unregister(&port->dev);
2104	}
2105}
2106EXPORT_SYMBOL_GPL(typec_unregister_port);
2107
2108static int __init typec_init(void)
2109{
2110	int ret;
2111
2112	ret = bus_register(&typec_bus);
2113	if (ret)
2114		return ret;
2115
2116	ret = class_register(&typec_mux_class);
2117	if (ret)
2118		goto err_unregister_bus;
2119
2120	ret = class_register(&typec_class);
2121	if (ret)
 
2122		goto err_unregister_mux_class;
 
2123
2124	return 0;
2125
2126err_unregister_mux_class:
2127	class_unregister(&typec_mux_class);
2128
2129err_unregister_bus:
2130	bus_unregister(&typec_bus);
2131
2132	return ret;
2133}
2134subsys_initcall(typec_init);
2135
2136static void __exit typec_exit(void)
2137{
2138	class_unregister(&typec_class);
2139	ida_destroy(&typec_index_ida);
2140	bus_unregister(&typec_bus);
2141	class_unregister(&typec_mux_class);
2142}
2143module_exit(typec_exit);
2144
2145MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
2146MODULE_LICENSE("GPL v2");
2147MODULE_DESCRIPTION("USB Type-C Connector Class");