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#include <linux/usb/typec_retimer.h>
 
  16
  17#include "bus.h"
  18#include "class.h"
  19#include "pd.h"
  20
  21static DEFINE_IDA(typec_index_ida);
  22
  23struct class typec_class = {
  24	.name = "typec",
  25	.owner = THIS_MODULE,
  26};
  27
  28/* ------------------------------------------------------------------------- */
  29/* Common attributes */
  30
  31static const char * const typec_accessory_modes[] = {
  32	[TYPEC_ACCESSORY_NONE]		= "none",
  33	[TYPEC_ACCESSORY_AUDIO]		= "analog_audio",
  34	[TYPEC_ACCESSORY_DEBUG]		= "debug",
  35};
  36
  37/* Product types defined in USB PD Specification R3.0 V2.0 */
  38static const char * const product_type_ufp[8] = {
  39	[IDH_PTYPE_NOT_UFP]		= "not_ufp",
  40	[IDH_PTYPE_HUB]			= "hub",
  41	[IDH_PTYPE_PERIPH]		= "peripheral",
  42	[IDH_PTYPE_PSD]			= "psd",
  43	[IDH_PTYPE_AMA]			= "ama",
  44};
  45
  46static const char * const product_type_dfp[8] = {
  47	[IDH_PTYPE_NOT_DFP]		= "not_dfp",
  48	[IDH_PTYPE_DFP_HUB]		= "hub",
  49	[IDH_PTYPE_DFP_HOST]		= "host",
  50	[IDH_PTYPE_DFP_PB]		= "power_brick",
  51};
  52
  53static const char * const product_type_cable[8] = {
  54	[IDH_PTYPE_NOT_CABLE]		= "not_cable",
  55	[IDH_PTYPE_PCABLE]		= "passive",
  56	[IDH_PTYPE_ACABLE]		= "active",
  57	[IDH_PTYPE_VPD]			= "vpd",
  58};
  59
  60static struct usb_pd_identity *get_pd_identity(struct device *dev)
  61{
  62	if (is_typec_partner(dev)) {
  63		struct typec_partner *partner = to_typec_partner(dev);
  64
  65		return partner->identity;
  66	} else if (is_typec_cable(dev)) {
  67		struct typec_cable *cable = to_typec_cable(dev);
  68
  69		return cable->identity;
  70	}
  71	return NULL;
  72}
  73
  74static const char *get_pd_product_type(struct device *dev)
  75{
  76	struct typec_port *port = to_typec_port(dev->parent);
  77	struct usb_pd_identity *id = get_pd_identity(dev);
  78	const char *ptype = NULL;
  79
  80	if (is_typec_partner(dev)) {
  81		if (!id)
  82			return NULL;
  83
  84		if (port->data_role == TYPEC_HOST)
  85			ptype = product_type_ufp[PD_IDH_PTYPE(id->id_header)];
  86		else
  87			ptype = product_type_dfp[PD_IDH_DFP_PTYPE(id->id_header)];
  88	} else if (is_typec_cable(dev)) {
  89		if (id)
  90			ptype = product_type_cable[PD_IDH_PTYPE(id->id_header)];
  91		else
  92			ptype = to_typec_cable(dev)->active ?
  93				product_type_cable[IDH_PTYPE_ACABLE] :
  94				product_type_cable[IDH_PTYPE_PCABLE];
  95	}
  96
  97	return ptype;
  98}
  99
 100static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
 101			      char *buf)
 102{
 103	struct usb_pd_identity *id = get_pd_identity(dev);
 104
 105	return sprintf(buf, "0x%08x\n", id->id_header);
 106}
 107static DEVICE_ATTR_RO(id_header);
 108
 109static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
 110			      char *buf)
 111{
 112	struct usb_pd_identity *id = get_pd_identity(dev);
 113
 114	return sprintf(buf, "0x%08x\n", id->cert_stat);
 115}
 116static DEVICE_ATTR_RO(cert_stat);
 117
 118static ssize_t product_show(struct device *dev, struct device_attribute *attr,
 119			    char *buf)
 120{
 121	struct usb_pd_identity *id = get_pd_identity(dev);
 122
 123	return sprintf(buf, "0x%08x\n", id->product);
 124}
 125static DEVICE_ATTR_RO(product);
 126
 127static ssize_t product_type_vdo1_show(struct device *dev, struct device_attribute *attr,
 128				      char *buf)
 129{
 130	struct usb_pd_identity *id = get_pd_identity(dev);
 131
 132	return sysfs_emit(buf, "0x%08x\n", id->vdo[0]);
 133}
 134static DEVICE_ATTR_RO(product_type_vdo1);
 135
 136static ssize_t product_type_vdo2_show(struct device *dev, struct device_attribute *attr,
 137				      char *buf)
 138{
 139	struct usb_pd_identity *id = get_pd_identity(dev);
 140
 141	return sysfs_emit(buf, "0x%08x\n", id->vdo[1]);
 142}
 143static DEVICE_ATTR_RO(product_type_vdo2);
 144
 145static ssize_t product_type_vdo3_show(struct device *dev, struct device_attribute *attr,
 146				      char *buf)
 147{
 148	struct usb_pd_identity *id = get_pd_identity(dev);
 149
 150	return sysfs_emit(buf, "0x%08x\n", id->vdo[2]);
 151}
 152static DEVICE_ATTR_RO(product_type_vdo3);
 153
 154static struct attribute *usb_pd_id_attrs[] = {
 155	&dev_attr_id_header.attr,
 156	&dev_attr_cert_stat.attr,
 157	&dev_attr_product.attr,
 158	&dev_attr_product_type_vdo1.attr,
 159	&dev_attr_product_type_vdo2.attr,
 160	&dev_attr_product_type_vdo3.attr,
 161	NULL
 162};
 163
 164static const struct attribute_group usb_pd_id_group = {
 165	.name = "identity",
 166	.attrs = usb_pd_id_attrs,
 167};
 168
 169static const struct attribute_group *usb_pd_id_groups[] = {
 170	&usb_pd_id_group,
 171	NULL,
 172};
 173
 174static void typec_product_type_notify(struct device *dev)
 175{
 176	char *envp[2] = { };
 177	const char *ptype;
 178
 179	ptype = get_pd_product_type(dev);
 180	if (!ptype)
 181		return;
 182
 183	sysfs_notify(&dev->kobj, NULL, "type");
 184
 185	envp[0] = kasprintf(GFP_KERNEL, "PRODUCT_TYPE=%s", ptype);
 186	if (!envp[0])
 187		return;
 188
 189	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 190	kfree(envp[0]);
 191}
 192
 193static void typec_report_identity(struct device *dev)
 194{
 195	sysfs_notify(&dev->kobj, "identity", "id_header");
 196	sysfs_notify(&dev->kobj, "identity", "cert_stat");
 197	sysfs_notify(&dev->kobj, "identity", "product");
 198	sysfs_notify(&dev->kobj, "identity", "product_type_vdo1");
 199	sysfs_notify(&dev->kobj, "identity", "product_type_vdo2");
 200	sysfs_notify(&dev->kobj, "identity", "product_type_vdo3");
 201	typec_product_type_notify(dev);
 202}
 203
 204static ssize_t
 205type_show(struct device *dev, struct device_attribute *attr, char *buf)
 206{
 207	const char *ptype;
 208
 209	ptype = get_pd_product_type(dev);
 210	if (!ptype)
 211		return 0;
 212
 213	return sysfs_emit(buf, "%s\n", ptype);
 214}
 215static DEVICE_ATTR_RO(type);
 216
 217static ssize_t usb_power_delivery_revision_show(struct device *dev,
 218						struct device_attribute *attr,
 219						char *buf);
 220static DEVICE_ATTR_RO(usb_power_delivery_revision);
 221
 222/* ------------------------------------------------------------------------- */
 223/* Alternate Modes */
 224
 225static int altmode_match(struct device *dev, void *data)
 226{
 227	struct typec_altmode *adev = to_typec_altmode(dev);
 228	struct typec_device_id *id = data;
 229
 230	if (!is_typec_altmode(dev))
 231		return 0;
 232
 233	return ((adev->svid == id->svid) && (adev->mode == id->mode));
 234}
 235
 236static void typec_altmode_set_partner(struct altmode *altmode)
 237{
 238	struct typec_altmode *adev = &altmode->adev;
 239	struct typec_device_id id = { adev->svid, adev->mode, };
 240	struct typec_port *port = typec_altmode2port(adev);
 241	struct altmode *partner;
 242	struct device *dev;
 243
 244	dev = device_find_child(&port->dev, &id, altmode_match);
 245	if (!dev)
 246		return;
 247
 248	/* Bind the port alt mode to the partner/plug alt mode. */
 249	partner = to_altmode(to_typec_altmode(dev));
 250	altmode->partner = partner;
 251
 252	/* Bind the partner/plug alt mode to the port alt mode. */
 253	if (is_typec_plug(adev->dev.parent)) {
 254		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
 255
 256		partner->plug[plug->index] = altmode;
 257	} else {
 258		partner->partner = altmode;
 259	}
 260}
 261
 262static void typec_altmode_put_partner(struct altmode *altmode)
 263{
 264	struct altmode *partner = altmode->partner;
 265	struct typec_altmode *adev;
 
 266
 267	if (!partner)
 268		return;
 269
 270	adev = &partner->adev;
 
 271
 272	if (is_typec_plug(adev->dev.parent)) {
 273		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
 274
 275		partner->plug[plug->index] = NULL;
 276	} else {
 277		partner->partner = NULL;
 278	}
 279	put_device(&adev->dev);
 280}
 281
 282/**
 283 * typec_altmode_update_active - Report Enter/Exit mode
 284 * @adev: Handle to the alternate mode
 285 * @active: True when the mode has been entered
 286 *
 287 * If a partner or cable plug executes Enter/Exit Mode command successfully, the
 288 * drivers use this routine to report the updated state of the mode.
 289 */
 290void typec_altmode_update_active(struct typec_altmode *adev, bool active)
 291{
 292	char dir[6];
 293
 294	if (adev->active == active)
 295		return;
 296
 297	if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
 298		if (!active)
 299			module_put(adev->dev.driver->owner);
 300		else
 301			WARN_ON(!try_module_get(adev->dev.driver->owner));
 302	}
 303
 304	adev->active = active;
 305	snprintf(dir, sizeof(dir), "mode%d", adev->mode);
 306	sysfs_notify(&adev->dev.kobj, dir, "active");
 307	sysfs_notify(&adev->dev.kobj, NULL, "active");
 308	kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
 309}
 310EXPORT_SYMBOL_GPL(typec_altmode_update_active);
 311
 312/**
 313 * typec_altmode2port - Alternate Mode to USB Type-C port
 314 * @alt: The Alternate Mode
 315 *
 316 * Returns handle to the port that a cable plug or partner with @alt is
 317 * connected to.
 318 */
 319struct typec_port *typec_altmode2port(struct typec_altmode *alt)
 320{
 321	if (is_typec_plug(alt->dev.parent))
 322		return to_typec_port(alt->dev.parent->parent->parent);
 323	if (is_typec_partner(alt->dev.parent))
 324		return to_typec_port(alt->dev.parent->parent);
 325	if (is_typec_port(alt->dev.parent))
 326		return to_typec_port(alt->dev.parent);
 327
 328	return NULL;
 329}
 330EXPORT_SYMBOL_GPL(typec_altmode2port);
 331
 332static ssize_t
 333vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
 334{
 335	struct typec_altmode *alt = to_typec_altmode(dev);
 336
 337	return sprintf(buf, "0x%08x\n", alt->vdo);
 338}
 339static DEVICE_ATTR_RO(vdo);
 340
 341static ssize_t
 342description_show(struct device *dev, struct device_attribute *attr, char *buf)
 343{
 344	struct typec_altmode *alt = to_typec_altmode(dev);
 345
 346	return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
 347}
 348static DEVICE_ATTR_RO(description);
 349
 350static ssize_t
 351active_show(struct device *dev, struct device_attribute *attr, char *buf)
 352{
 353	struct typec_altmode *alt = to_typec_altmode(dev);
 354
 355	return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
 356}
 357
 358static ssize_t active_store(struct device *dev, struct device_attribute *attr,
 359			    const char *buf, size_t size)
 360{
 361	struct typec_altmode *adev = to_typec_altmode(dev);
 362	struct altmode *altmode = to_altmode(adev);
 363	bool enter;
 364	int ret;
 365
 366	ret = kstrtobool(buf, &enter);
 367	if (ret)
 368		return ret;
 369
 370	if (adev->active == enter)
 371		return size;
 372
 373	if (is_typec_port(adev->dev.parent)) {
 374		typec_altmode_update_active(adev, enter);
 375
 376		/* Make sure that the partner exits the mode before disabling */
 377		if (altmode->partner && !enter && altmode->partner->adev.active)
 378			typec_altmode_exit(&altmode->partner->adev);
 379	} else if (altmode->partner) {
 380		if (enter && !altmode->partner->adev.active) {
 381			dev_warn(dev, "port has the mode disabled\n");
 382			return -EPERM;
 383		}
 384	}
 385
 386	/* Note: If there is no driver, the mode will not be entered */
 387	if (adev->ops && adev->ops->activate) {
 388		ret = adev->ops->activate(adev, enter);
 389		if (ret)
 390			return ret;
 391	}
 392
 393	return size;
 394}
 395static DEVICE_ATTR_RW(active);
 396
 397static ssize_t
 398supported_roles_show(struct device *dev, struct device_attribute *attr,
 399		     char *buf)
 400{
 401	struct altmode *alt = to_altmode(to_typec_altmode(dev));
 402	ssize_t ret;
 403
 404	switch (alt->roles) {
 405	case TYPEC_PORT_SRC:
 406		ret = sprintf(buf, "source\n");
 407		break;
 408	case TYPEC_PORT_SNK:
 409		ret = sprintf(buf, "sink\n");
 410		break;
 411	case TYPEC_PORT_DRP:
 412	default:
 413		ret = sprintf(buf, "source sink\n");
 414		break;
 415	}
 416	return ret;
 417}
 418static DEVICE_ATTR_RO(supported_roles);
 419
 420static ssize_t
 421mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 422{
 423	struct typec_altmode *adev = to_typec_altmode(dev);
 424
 425	return sprintf(buf, "%u\n", adev->mode);
 426}
 427static DEVICE_ATTR_RO(mode);
 428
 429static ssize_t
 430svid_show(struct device *dev, struct device_attribute *attr, char *buf)
 431{
 432	struct typec_altmode *adev = to_typec_altmode(dev);
 433
 434	return sprintf(buf, "%04x\n", adev->svid);
 435}
 436static DEVICE_ATTR_RO(svid);
 437
 438static struct attribute *typec_altmode_attrs[] = {
 439	&dev_attr_active.attr,
 440	&dev_attr_mode.attr,
 441	&dev_attr_svid.attr,
 442	&dev_attr_vdo.attr,
 443	NULL
 444};
 445
 446static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
 447					     struct attribute *attr, int n)
 448{
 449	struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
 450
 451	if (attr == &dev_attr_active.attr)
 452		if (!adev->ops || !adev->ops->activate)
 453			return 0444;
 454
 455	return attr->mode;
 456}
 457
 458static const struct attribute_group typec_altmode_group = {
 459	.is_visible = typec_altmode_attr_is_visible,
 460	.attrs = typec_altmode_attrs,
 461};
 462
 463static const struct attribute_group *typec_altmode_groups[] = {
 464	&typec_altmode_group,
 465	NULL
 466};
 467
 468static int altmode_id_get(struct device *dev)
 469{
 470	struct ida *ids;
 471
 472	if (is_typec_partner(dev))
 473		ids = &to_typec_partner(dev)->mode_ids;
 474	else if (is_typec_plug(dev))
 475		ids = &to_typec_plug(dev)->mode_ids;
 476	else
 477		ids = &to_typec_port(dev)->mode_ids;
 478
 479	return ida_simple_get(ids, 0, 0, GFP_KERNEL);
 480}
 481
 482static void altmode_id_remove(struct device *dev, int id)
 483{
 484	struct ida *ids;
 485
 486	if (is_typec_partner(dev))
 487		ids = &to_typec_partner(dev)->mode_ids;
 488	else if (is_typec_plug(dev))
 489		ids = &to_typec_plug(dev)->mode_ids;
 490	else
 491		ids = &to_typec_port(dev)->mode_ids;
 492
 493	ida_simple_remove(ids, id);
 494}
 495
 496static void typec_altmode_release(struct device *dev)
 497{
 498	struct altmode *alt = to_altmode(to_typec_altmode(dev));
 499
 500	typec_altmode_put_partner(alt);
 
 501
 502	altmode_id_remove(alt->adev.dev.parent, alt->id);
 503	kfree(alt);
 504}
 505
 506const struct device_type typec_altmode_dev_type = {
 507	.name = "typec_alternate_mode",
 508	.groups = typec_altmode_groups,
 509	.release = typec_altmode_release,
 510};
 511
 512static struct typec_altmode *
 513typec_register_altmode(struct device *parent,
 514		       const struct typec_altmode_desc *desc)
 515{
 516	unsigned int id = altmode_id_get(parent);
 517	bool is_port = is_typec_port(parent);
 518	struct altmode *alt;
 519	int ret;
 520
 521	alt = kzalloc(sizeof(*alt), GFP_KERNEL);
 522	if (!alt) {
 523		altmode_id_remove(parent, id);
 524		return ERR_PTR(-ENOMEM);
 525	}
 526
 527	alt->adev.svid = desc->svid;
 528	alt->adev.mode = desc->mode;
 529	alt->adev.vdo = desc->vdo;
 530	alt->roles = desc->roles;
 531	alt->id = id;
 532
 533	alt->attrs[0] = &dev_attr_vdo.attr;
 534	alt->attrs[1] = &dev_attr_description.attr;
 535	alt->attrs[2] = &dev_attr_active.attr;
 536
 537	if (is_port) {
 538		alt->attrs[3] = &dev_attr_supported_roles.attr;
 539		alt->adev.active = true; /* Enabled by default */
 540	}
 541
 542	sprintf(alt->group_name, "mode%d", desc->mode);
 543	alt->group.name = alt->group_name;
 544	alt->group.attrs = alt->attrs;
 545	alt->groups[0] = &alt->group;
 546
 547	alt->adev.dev.parent = parent;
 548	alt->adev.dev.groups = alt->groups;
 549	alt->adev.dev.type = &typec_altmode_dev_type;
 550	dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
 551
 552	/* Link partners and plugs with the ports */
 553	if (!is_port)
 554		typec_altmode_set_partner(alt);
 555
 556	/* The partners are bind to drivers */
 557	if (is_typec_partner(parent))
 558		alt->adev.dev.bus = &typec_bus;
 559
 560	/* Plug alt modes need a class to generate udev events. */
 561	if (is_typec_plug(parent))
 562		alt->adev.dev.class = &typec_class;
 563
 564	ret = device_register(&alt->adev.dev);
 565	if (ret) {
 566		dev_err(parent, "failed to register alternate mode (%d)\n",
 567			ret);
 568		put_device(&alt->adev.dev);
 569		return ERR_PTR(ret);
 570	}
 571
 572	return &alt->adev;
 573}
 574
 575/**
 576 * typec_unregister_altmode - Unregister Alternate Mode
 577 * @adev: The alternate mode to be unregistered
 578 *
 579 * Unregister device created with typec_partner_register_altmode(),
 580 * typec_plug_register_altmode() or typec_port_register_altmode().
 581 */
 582void typec_unregister_altmode(struct typec_altmode *adev)
 583{
 584	if (IS_ERR_OR_NULL(adev))
 585		return;
 
 586	typec_mux_put(to_altmode(adev)->mux);
 587	device_unregister(&adev->dev);
 588}
 589EXPORT_SYMBOL_GPL(typec_unregister_altmode);
 590
 591/* ------------------------------------------------------------------------- */
 592/* Type-C Partners */
 593
 594static ssize_t accessory_mode_show(struct device *dev,
 595				   struct device_attribute *attr,
 596				   char *buf)
 597{
 598	struct typec_partner *p = to_typec_partner(dev);
 599
 600	return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
 601}
 602static DEVICE_ATTR_RO(accessory_mode);
 603
 604static ssize_t supports_usb_power_delivery_show(struct device *dev,
 605						struct device_attribute *attr,
 606						char *buf)
 607{
 608	struct typec_partner *p = to_typec_partner(dev);
 609
 610	return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
 611}
 612static DEVICE_ATTR_RO(supports_usb_power_delivery);
 613
 614static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr,
 615					      char *buf)
 616{
 617	struct typec_partner *partner;
 618	struct typec_plug *plug;
 619	int num_altmodes;
 620
 621	if (is_typec_partner(dev)) {
 622		partner = to_typec_partner(dev);
 623		num_altmodes = partner->num_altmodes;
 624	} else if (is_typec_plug(dev)) {
 625		plug = to_typec_plug(dev);
 626		num_altmodes = plug->num_altmodes;
 627	} else {
 628		return 0;
 629	}
 630
 631	return sysfs_emit(buf, "%d\n", num_altmodes);
 632}
 633static DEVICE_ATTR_RO(number_of_alternate_modes);
 634
 635static struct attribute *typec_partner_attrs[] = {
 636	&dev_attr_accessory_mode.attr,
 637	&dev_attr_supports_usb_power_delivery.attr,
 638	&dev_attr_number_of_alternate_modes.attr,
 639	&dev_attr_type.attr,
 640	&dev_attr_usb_power_delivery_revision.attr,
 641	NULL
 642};
 643
 644static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
 645{
 646	struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj));
 647
 648	if (attr == &dev_attr_number_of_alternate_modes.attr) {
 649		if (partner->num_altmodes < 0)
 650			return 0;
 651	}
 652
 653	if (attr == &dev_attr_type.attr)
 654		if (!get_pd_product_type(kobj_to_dev(kobj)))
 655			return 0;
 656
 657	return attr->mode;
 658}
 659
 660static const struct attribute_group typec_partner_group = {
 661	.is_visible = typec_partner_attr_is_visible,
 662	.attrs = typec_partner_attrs
 663};
 664
 665static const struct attribute_group *typec_partner_groups[] = {
 666	&typec_partner_group,
 667	NULL
 668};
 669
 670static void typec_partner_release(struct device *dev)
 671{
 672	struct typec_partner *partner = to_typec_partner(dev);
 673
 674	ida_destroy(&partner->mode_ids);
 675	kfree(partner);
 676}
 677
 678const struct device_type typec_partner_dev_type = {
 679	.name = "typec_partner",
 680	.groups = typec_partner_groups,
 681	.release = typec_partner_release,
 682};
 683
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 684/**
 685 * typec_partner_set_identity - Report result from Discover Identity command
 686 * @partner: The partner updated identity values
 687 *
 688 * This routine is used to report that the result of Discover Identity USB power
 689 * delivery command has become available.
 690 */
 691int typec_partner_set_identity(struct typec_partner *partner)
 692{
 693	if (!partner->identity)
 694		return -EINVAL;
 695
 696	typec_report_identity(&partner->dev);
 697	return 0;
 698}
 699EXPORT_SYMBOL_GPL(typec_partner_set_identity);
 700
 701/**
 702 * typec_partner_set_pd_revision - Set the PD revision supported by the partner
 703 * @partner: The partner to be updated.
 704 * @pd_revision:  USB Power Delivery Specification Revision supported by partner
 705 *
 706 * This routine is used to report that the PD revision of the port partner has
 707 * become available.
 708 */
 709void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision)
 710{
 711	if (partner->pd_revision == pd_revision)
 712		return;
 713
 714	partner->pd_revision = pd_revision;
 715	sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision");
 716	if (pd_revision != 0 && !partner->usb_pd) {
 717		partner->usb_pd = 1;
 718		sysfs_notify(&partner->dev.kobj, NULL,
 719			     "supports_usb_power_delivery");
 720	}
 721	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
 722}
 723EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision);
 724
 725/**
 726 * typec_partner_set_usb_power_delivery - Declare USB Power Delivery Contract.
 727 * @partner: The partner device.
 728 * @pd: The USB PD instance.
 729 *
 730 * This routine can be used to declare USB Power Delivery Contract with @partner
 731 * by linking @partner to @pd which contains the objects that were used during the
 732 * negotiation of the contract.
 733 *
 734 * If @pd is NULL, the link is removed and the contract with @partner has ended.
 735 */
 736int typec_partner_set_usb_power_delivery(struct typec_partner *partner,
 737					 struct usb_power_delivery *pd)
 738{
 739	int ret;
 740
 741	if (IS_ERR_OR_NULL(partner) || partner->pd == pd)
 742		return 0;
 743
 744	if (pd) {
 745		ret = usb_power_delivery_link_device(pd, &partner->dev);
 746		if (ret)
 747			return ret;
 748	} else {
 749		usb_power_delivery_unlink_device(partner->pd, &partner->dev);
 750	}
 751
 752	partner->pd = pd;
 753
 754	return 0;
 755}
 756EXPORT_SYMBOL_GPL(typec_partner_set_usb_power_delivery);
 757
 758/**
 759 * typec_partner_set_num_altmodes - Set the number of available partner altmodes
 760 * @partner: The partner to be updated.
 761 * @num_altmodes: The number of altmodes we want to specify as available.
 762 *
 763 * This routine is used to report the number of alternate modes supported by the
 764 * partner. This value is *not* enforced in alternate mode registration routines.
 765 *
 766 * @partner.num_altmodes is set to -1 on partner registration, denoting that
 767 * a valid value has not been set for it yet.
 768 *
 769 * Returns 0 on success or negative error number on failure.
 770 */
 771int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes)
 772{
 773	int ret;
 774
 775	if (num_altmodes < 0)
 776		return -EINVAL;
 777
 778	partner->num_altmodes = num_altmodes;
 779	ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group);
 780	if (ret < 0)
 781		return ret;
 782
 783	sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes");
 784	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
 785
 786	return 0;
 787}
 788EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes);
 789
 790/**
 791 * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
 792 * @partner: USB Type-C Partner that supports the alternate mode
 793 * @desc: Description of the alternate mode
 794 *
 795 * This routine is used to register each alternate mode individually that
 796 * @partner has listed in response to Discover SVIDs command. The modes for a
 797 * SVID listed in response to Discover Modes command need to be listed in an
 798 * array in @desc.
 799 *
 800 * Returns handle to the alternate mode on success or ERR_PTR on failure.
 801 */
 802struct typec_altmode *
 803typec_partner_register_altmode(struct typec_partner *partner,
 804			       const struct typec_altmode_desc *desc)
 805{
 806	return typec_register_altmode(&partner->dev, desc);
 807}
 808EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
 809
 810/**
 811 * typec_partner_set_svdm_version - Set negotiated Structured VDM (SVDM) Version
 812 * @partner: USB Type-C Partner that supports SVDM
 813 * @svdm_version: Negotiated SVDM Version
 814 *
 815 * This routine is used to save the negotiated SVDM Version.
 816 */
 817void typec_partner_set_svdm_version(struct typec_partner *partner,
 818				   enum usb_pd_svdm_ver svdm_version)
 819{
 820	partner->svdm_version = svdm_version;
 821}
 822EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version);
 823
 824/**
 825 * typec_partner_usb_power_delivery_register - Register Type-C partner USB Power Delivery Support
 826 * @partner: Type-C partner device.
 827 * @desc: Description of the USB PD contract.
 828 *
 829 * This routine is a wrapper around usb_power_delivery_register(). It registers
 830 * USB Power Delivery Capabilities for a Type-C partner device. Specifically,
 831 * it sets the Type-C partner device as a parent for the resulting USB Power Delivery object.
 832 *
 833 * Returns handle to struct usb_power_delivery or ERR_PTR.
 834 */
 835struct usb_power_delivery *
 836typec_partner_usb_power_delivery_register(struct typec_partner *partner,
 837					  struct usb_power_delivery_desc *desc)
 838{
 839	return usb_power_delivery_register(&partner->dev, desc);
 840}
 841EXPORT_SYMBOL_GPL(typec_partner_usb_power_delivery_register);
 842
 843/**
 844 * typec_register_partner - Register a USB Type-C Partner
 845 * @port: The USB Type-C Port the partner is connected to
 846 * @desc: Description of the partner
 847 *
 848 * Registers a device for USB Type-C Partner described in @desc.
 849 *
 850 * Returns handle to the partner on success or ERR_PTR on failure.
 851 */
 852struct typec_partner *typec_register_partner(struct typec_port *port,
 853					     struct typec_partner_desc *desc)
 854{
 855	struct typec_partner *partner;
 856	int ret;
 857
 858	partner = kzalloc(sizeof(*partner), GFP_KERNEL);
 859	if (!partner)
 860		return ERR_PTR(-ENOMEM);
 861
 862	ida_init(&partner->mode_ids);
 863	partner->usb_pd = desc->usb_pd;
 864	partner->accessory = desc->accessory;
 865	partner->num_altmodes = -1;
 866	partner->pd_revision = desc->pd_revision;
 867	partner->svdm_version = port->cap->svdm_version;
 
 
 868
 869	if (desc->identity) {
 870		/*
 871		 * Creating directory for the identity only if the driver is
 872		 * able to provide data to it.
 873		 */
 874		partner->dev.groups = usb_pd_id_groups;
 875		partner->identity = desc->identity;
 876	}
 877
 878	partner->dev.class = &typec_class;
 879	partner->dev.parent = &port->dev;
 880	partner->dev.type = &typec_partner_dev_type;
 881	dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
 882
 883	ret = device_register(&partner->dev);
 884	if (ret) {
 885		dev_err(&port->dev, "failed to register partner (%d)\n", ret);
 886		put_device(&partner->dev);
 887		return ERR_PTR(ret);
 888	}
 889
 
 
 
 
 
 890	return partner;
 891}
 892EXPORT_SYMBOL_GPL(typec_register_partner);
 893
 894/**
 895 * typec_unregister_partner - Unregister a USB Type-C Partner
 896 * @partner: The partner to be unregistered
 897 *
 898 * Unregister device created with typec_register_partner().
 899 */
 900void typec_unregister_partner(struct typec_partner *partner)
 901{
 902	if (!IS_ERR_OR_NULL(partner))
 903		device_unregister(&partner->dev);
 
 
 
 
 
 
 
 
 
 
 
 904}
 905EXPORT_SYMBOL_GPL(typec_unregister_partner);
 906
 907/* ------------------------------------------------------------------------- */
 908/* Type-C Cable Plugs */
 909
 910static void typec_plug_release(struct device *dev)
 911{
 912	struct typec_plug *plug = to_typec_plug(dev);
 913
 914	ida_destroy(&plug->mode_ids);
 915	kfree(plug);
 916}
 917
 918static struct attribute *typec_plug_attrs[] = {
 919	&dev_attr_number_of_alternate_modes.attr,
 920	NULL
 921};
 922
 923static umode_t typec_plug_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
 924{
 925	struct typec_plug *plug = to_typec_plug(kobj_to_dev(kobj));
 926
 927	if (attr == &dev_attr_number_of_alternate_modes.attr) {
 928		if (plug->num_altmodes < 0)
 929			return 0;
 930	}
 931
 932	return attr->mode;
 933}
 934
 935static const struct attribute_group typec_plug_group = {
 936	.is_visible = typec_plug_attr_is_visible,
 937	.attrs = typec_plug_attrs
 938};
 939
 940static const struct attribute_group *typec_plug_groups[] = {
 941	&typec_plug_group,
 942	NULL
 943};
 944
 945const struct device_type typec_plug_dev_type = {
 946	.name = "typec_plug",
 947	.groups = typec_plug_groups,
 948	.release = typec_plug_release,
 949};
 950
 951/**
 952 * typec_plug_set_num_altmodes - Set the number of available plug altmodes
 953 * @plug: The plug to be updated.
 954 * @num_altmodes: The number of altmodes we want to specify as available.
 955 *
 956 * This routine is used to report the number of alternate modes supported by the
 957 * plug. This value is *not* enforced in alternate mode registration routines.
 958 *
 959 * @plug.num_altmodes is set to -1 on plug registration, denoting that
 960 * a valid value has not been set for it yet.
 961 *
 962 * Returns 0 on success or negative error number on failure.
 963 */
 964int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes)
 965{
 966	int ret;
 967
 968	if (num_altmodes < 0)
 969		return -EINVAL;
 970
 971	plug->num_altmodes = num_altmodes;
 972	ret = sysfs_update_group(&plug->dev.kobj, &typec_plug_group);
 973	if (ret < 0)
 974		return ret;
 975
 976	sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes");
 977	kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE);
 978
 979	return 0;
 980}
 981EXPORT_SYMBOL_GPL(typec_plug_set_num_altmodes);
 982
 983/**
 984 * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
 985 * @plug: USB Type-C Cable Plug that supports the alternate mode
 986 * @desc: Description of the alternate mode
 987 *
 988 * This routine is used to register each alternate mode individually that @plug
 989 * has listed in response to Discover SVIDs command. The modes for a SVID that
 990 * the plug lists in response to Discover Modes command need to be listed in an
 991 * array in @desc.
 992 *
 993 * Returns handle to the alternate mode on success or ERR_PTR on failure.
 994 */
 995struct typec_altmode *
 996typec_plug_register_altmode(struct typec_plug *plug,
 997			    const struct typec_altmode_desc *desc)
 998{
 999	return typec_register_altmode(&plug->dev, desc);
1000}
1001EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
1002
1003/**
1004 * typec_register_plug - Register a USB Type-C Cable Plug
1005 * @cable: USB Type-C Cable with the plug
1006 * @desc: Description of the cable plug
1007 *
1008 * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
1009 * Cable Plug represents a plug with electronics in it that can response to USB
1010 * Power Delivery SOP Prime or SOP Double Prime packages.
1011 *
1012 * Returns handle to the cable plug on success or ERR_PTR on failure.
1013 */
1014struct typec_plug *typec_register_plug(struct typec_cable *cable,
1015				       struct typec_plug_desc *desc)
1016{
1017	struct typec_plug *plug;
1018	char name[8];
1019	int ret;
1020
1021	plug = kzalloc(sizeof(*plug), GFP_KERNEL);
1022	if (!plug)
1023		return ERR_PTR(-ENOMEM);
1024
1025	sprintf(name, "plug%d", desc->index);
1026
1027	ida_init(&plug->mode_ids);
1028	plug->num_altmodes = -1;
1029	plug->index = desc->index;
1030	plug->dev.class = &typec_class;
1031	plug->dev.parent = &cable->dev;
1032	plug->dev.type = &typec_plug_dev_type;
1033	dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
1034
1035	ret = device_register(&plug->dev);
1036	if (ret) {
1037		dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
1038		put_device(&plug->dev);
1039		return ERR_PTR(ret);
1040	}
1041
1042	return plug;
1043}
1044EXPORT_SYMBOL_GPL(typec_register_plug);
1045
1046/**
1047 * typec_unregister_plug - Unregister a USB Type-C Cable Plug
1048 * @plug: The cable plug to be unregistered
1049 *
1050 * Unregister device created with typec_register_plug().
1051 */
1052void typec_unregister_plug(struct typec_plug *plug)
1053{
1054	if (!IS_ERR_OR_NULL(plug))
1055		device_unregister(&plug->dev);
1056}
1057EXPORT_SYMBOL_GPL(typec_unregister_plug);
1058
1059/* Type-C Cables */
1060
1061static const char * const typec_plug_types[] = {
1062	[USB_PLUG_NONE]		= "unknown",
1063	[USB_PLUG_TYPE_A]	= "type-a",
1064	[USB_PLUG_TYPE_B]	= "type-b",
1065	[USB_PLUG_TYPE_C]	= "type-c",
1066	[USB_PLUG_CAPTIVE]	= "captive",
1067};
1068
1069static ssize_t plug_type_show(struct device *dev,
1070			      struct device_attribute *attr, char *buf)
1071{
1072	struct typec_cable *cable = to_typec_cable(dev);
1073
1074	return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
1075}
1076static DEVICE_ATTR_RO(plug_type);
1077
1078static struct attribute *typec_cable_attrs[] = {
1079	&dev_attr_type.attr,
1080	&dev_attr_plug_type.attr,
1081	&dev_attr_usb_power_delivery_revision.attr,
1082	NULL
1083};
1084ATTRIBUTE_GROUPS(typec_cable);
1085
1086static void typec_cable_release(struct device *dev)
1087{
1088	struct typec_cable *cable = to_typec_cable(dev);
1089
1090	kfree(cable);
1091}
1092
1093const struct device_type typec_cable_dev_type = {
1094	.name = "typec_cable",
1095	.groups = typec_cable_groups,
1096	.release = typec_cable_release,
1097};
1098
1099static int cable_match(struct device *dev, void *data)
1100{
1101	return is_typec_cable(dev);
1102}
1103
1104/**
1105 * typec_cable_get - Get a reference to the USB Type-C cable
1106 * @port: The USB Type-C Port the cable is connected to
1107 *
1108 * The caller must decrement the reference count with typec_cable_put() after
1109 * use.
1110 */
1111struct typec_cable *typec_cable_get(struct typec_port *port)
1112{
1113	struct device *dev;
1114
1115	dev = device_find_child(&port->dev, NULL, cable_match);
1116	if (!dev)
1117		return NULL;
1118
1119	return to_typec_cable(dev);
1120}
1121EXPORT_SYMBOL_GPL(typec_cable_get);
1122
1123/**
1124 * typec_cable_put - Decrement the reference count on USB Type-C cable
1125 * @cable: The USB Type-C cable
1126 */
1127void typec_cable_put(struct typec_cable *cable)
1128{
1129	put_device(&cable->dev);
1130}
1131EXPORT_SYMBOL_GPL(typec_cable_put);
1132
1133/**
1134 * typec_cable_is_active - Check is the USB Type-C cable active or passive
1135 * @cable: The USB Type-C Cable
1136 *
1137 * Return 1 if the cable is active or 0 if it's passive.
1138 */
1139int typec_cable_is_active(struct typec_cable *cable)
1140{
1141	return cable->active;
1142}
1143EXPORT_SYMBOL_GPL(typec_cable_is_active);
1144
1145/**
1146 * typec_cable_set_identity - Report result from Discover Identity command
1147 * @cable: The cable updated identity values
1148 *
1149 * This routine is used to report that the result of Discover Identity USB power
1150 * delivery command has become available.
1151 */
1152int typec_cable_set_identity(struct typec_cable *cable)
1153{
1154	if (!cable->identity)
1155		return -EINVAL;
1156
1157	typec_report_identity(&cable->dev);
1158	return 0;
1159}
1160EXPORT_SYMBOL_GPL(typec_cable_set_identity);
1161
1162/**
1163 * typec_register_cable - Register a USB Type-C Cable
1164 * @port: The USB Type-C Port the cable is connected to
1165 * @desc: Description of the cable
1166 *
1167 * Registers a device for USB Type-C Cable described in @desc. The cable will be
1168 * parent for the optional cable plug devises.
1169 *
1170 * Returns handle to the cable on success or ERR_PTR on failure.
1171 */
1172struct typec_cable *typec_register_cable(struct typec_port *port,
1173					 struct typec_cable_desc *desc)
1174{
1175	struct typec_cable *cable;
1176	int ret;
1177
1178	cable = kzalloc(sizeof(*cable), GFP_KERNEL);
1179	if (!cable)
1180		return ERR_PTR(-ENOMEM);
1181
1182	cable->type = desc->type;
1183	cable->active = desc->active;
1184	cable->pd_revision = desc->pd_revision;
1185
1186	if (desc->identity) {
1187		/*
1188		 * Creating directory for the identity only if the driver is
1189		 * able to provide data to it.
1190		 */
1191		cable->dev.groups = usb_pd_id_groups;
1192		cable->identity = desc->identity;
1193	}
1194
1195	cable->dev.class = &typec_class;
1196	cable->dev.parent = &port->dev;
1197	cable->dev.type = &typec_cable_dev_type;
1198	dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
1199
1200	ret = device_register(&cable->dev);
1201	if (ret) {
1202		dev_err(&port->dev, "failed to register cable (%d)\n", ret);
1203		put_device(&cable->dev);
1204		return ERR_PTR(ret);
1205	}
1206
1207	return cable;
1208}
1209EXPORT_SYMBOL_GPL(typec_register_cable);
1210
1211/**
1212 * typec_unregister_cable - Unregister a USB Type-C Cable
1213 * @cable: The cable to be unregistered
1214 *
1215 * Unregister device created with typec_register_cable().
1216 */
1217void typec_unregister_cable(struct typec_cable *cable)
1218{
1219	if (!IS_ERR_OR_NULL(cable))
1220		device_unregister(&cable->dev);
1221}
1222EXPORT_SYMBOL_GPL(typec_unregister_cable);
1223
1224/* ------------------------------------------------------------------------- */
1225/* USB Type-C ports */
1226
1227/**
1228 * typec_port_set_usb_power_delivery - Assign USB PD for port.
1229 * @port: USB Type-C port.
1230 * @pd: USB PD instance.
1231 *
1232 * This routine can be used to set the USB Power Delivery Capabilities for @port
1233 * that it will advertise to the partner.
1234 *
1235 * If @pd is NULL, the assignment is removed.
1236 */
1237int typec_port_set_usb_power_delivery(struct typec_port *port, struct usb_power_delivery *pd)
1238{
1239	int ret;
1240
1241	if (IS_ERR_OR_NULL(port) || port->pd == pd)
1242		return 0;
1243
1244	if (pd) {
1245		ret = usb_power_delivery_link_device(pd, &port->dev);
1246		if (ret)
1247			return ret;
1248	} else {
1249		usb_power_delivery_unlink_device(port->pd, &port->dev);
1250	}
1251
1252	port->pd = pd;
1253
1254	return 0;
1255}
1256EXPORT_SYMBOL_GPL(typec_port_set_usb_power_delivery);
1257
1258static ssize_t select_usb_power_delivery_store(struct device *dev,
1259					       struct device_attribute *attr,
1260					       const char *buf, size_t size)
1261{
1262	struct typec_port *port = to_typec_port(dev);
1263	struct usb_power_delivery *pd;
 
1264
1265	if (!port->ops || !port->ops->pd_set)
1266		return -EOPNOTSUPP;
1267
1268	pd = usb_power_delivery_find(buf);
1269	if (!pd)
1270		return -EINVAL;
1271
1272	return port->ops->pd_set(port, pd);
 
 
 
 
1273}
1274
1275static ssize_t select_usb_power_delivery_show(struct device *dev,
1276					      struct device_attribute *attr, char *buf)
1277{
1278	struct typec_port *port = to_typec_port(dev);
1279	struct usb_power_delivery **pds;
1280	struct usb_power_delivery *pd;
1281	int ret = 0;
1282
1283	if (!port->ops || !port->ops->pd_get)
1284		return -EOPNOTSUPP;
1285
1286	pds = port->ops->pd_get(port);
1287	if (!pds)
1288		return 0;
1289
1290	for (pd = pds[0]; pd; pd++) {
1291		if (pd == port->pd)
1292			ret += sysfs_emit(buf + ret, "[%s] ", dev_name(&pd->dev));
1293		else
1294			ret += sysfs_emit(buf + ret, "%s ", dev_name(&pd->dev));
1295	}
1296
1297	buf[ret - 1] = '\n';
1298
1299	return ret;
1300}
1301static DEVICE_ATTR_RW(select_usb_power_delivery);
1302
1303static struct attribute *port_attrs[] = {
1304	&dev_attr_select_usb_power_delivery.attr,
1305	NULL
1306};
1307
1308static umode_t port_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
1309{
1310	struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1311
1312	if (!port->pd || !port->ops || !port->ops->pd_get)
1313		return 0;
1314	if (!port->ops->pd_set)
1315		return 0444;
1316
1317	return attr->mode;
1318}
1319
1320static const struct attribute_group pd_group = {
1321	.is_visible = port_attr_is_visible,
1322	.attrs = port_attrs,
1323};
1324
1325static const char * const typec_orientations[] = {
1326	[TYPEC_ORIENTATION_NONE]	= "unknown",
1327	[TYPEC_ORIENTATION_NORMAL]	= "normal",
1328	[TYPEC_ORIENTATION_REVERSE]	= "reverse",
1329};
1330
1331static const char * const typec_roles[] = {
1332	[TYPEC_SINK]	= "sink",
1333	[TYPEC_SOURCE]	= "source",
1334};
1335
1336static const char * const typec_data_roles[] = {
1337	[TYPEC_DEVICE]	= "device",
1338	[TYPEC_HOST]	= "host",
1339};
1340
1341static const char * const typec_port_power_roles[] = {
1342	[TYPEC_PORT_SRC] = "source",
1343	[TYPEC_PORT_SNK] = "sink",
1344	[TYPEC_PORT_DRP] = "dual",
1345};
1346
1347static const char * const typec_port_data_roles[] = {
1348	[TYPEC_PORT_DFP] = "host",
1349	[TYPEC_PORT_UFP] = "device",
1350	[TYPEC_PORT_DRD] = "dual",
1351};
1352
1353static const char * const typec_port_types_drp[] = {
1354	[TYPEC_PORT_SRC] = "dual [source] sink",
1355	[TYPEC_PORT_SNK] = "dual source [sink]",
1356	[TYPEC_PORT_DRP] = "[dual] source sink",
1357};
1358
1359static ssize_t
1360preferred_role_store(struct device *dev, struct device_attribute *attr,
1361		     const char *buf, size_t size)
1362{
1363	struct typec_port *port = to_typec_port(dev);
1364	int role;
1365	int ret;
1366
1367	if (port->cap->type != TYPEC_PORT_DRP) {
1368		dev_dbg(dev, "Preferred role only supported with DRP ports\n");
1369		return -EOPNOTSUPP;
1370	}
1371
1372	if (!port->ops || !port->ops->try_role) {
1373		dev_dbg(dev, "Setting preferred role not supported\n");
1374		return -EOPNOTSUPP;
1375	}
1376
1377	role = sysfs_match_string(typec_roles, buf);
1378	if (role < 0) {
1379		if (sysfs_streq(buf, "none"))
1380			role = TYPEC_NO_PREFERRED_ROLE;
1381		else
1382			return -EINVAL;
1383	}
1384
1385	ret = port->ops->try_role(port, role);
1386	if (ret)
1387		return ret;
1388
1389	port->prefer_role = role;
1390	return size;
1391}
1392
1393static ssize_t
1394preferred_role_show(struct device *dev, struct device_attribute *attr,
1395		    char *buf)
1396{
1397	struct typec_port *port = to_typec_port(dev);
1398
1399	if (port->cap->type != TYPEC_PORT_DRP)
1400		return 0;
1401
1402	if (port->prefer_role < 0)
1403		return 0;
1404
1405	return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
1406}
1407static DEVICE_ATTR_RW(preferred_role);
1408
1409static ssize_t data_role_store(struct device *dev,
1410			       struct device_attribute *attr,
1411			       const char *buf, size_t size)
1412{
1413	struct typec_port *port = to_typec_port(dev);
1414	int ret;
1415
1416	if (!port->ops || !port->ops->dr_set) {
1417		dev_dbg(dev, "data role swapping not supported\n");
1418		return -EOPNOTSUPP;
1419	}
1420
1421	ret = sysfs_match_string(typec_data_roles, buf);
1422	if (ret < 0)
1423		return ret;
1424
1425	mutex_lock(&port->port_type_lock);
1426	if (port->cap->data != TYPEC_PORT_DRD) {
1427		ret = -EOPNOTSUPP;
1428		goto unlock_and_ret;
1429	}
1430
1431	ret = port->ops->dr_set(port, ret);
1432	if (ret)
1433		goto unlock_and_ret;
1434
1435	ret = size;
1436unlock_and_ret:
1437	mutex_unlock(&port->port_type_lock);
1438	return ret;
1439}
1440
1441static ssize_t data_role_show(struct device *dev,
1442			      struct device_attribute *attr, char *buf)
1443{
1444	struct typec_port *port = to_typec_port(dev);
1445
1446	if (port->cap->data == TYPEC_PORT_DRD)
1447		return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
1448			       "[host] device" : "host [device]");
1449
1450	return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
1451}
1452static DEVICE_ATTR_RW(data_role);
1453
1454static ssize_t power_role_store(struct device *dev,
1455				struct device_attribute *attr,
1456				const char *buf, size_t size)
1457{
1458	struct typec_port *port = to_typec_port(dev);
1459	int ret;
1460
1461	if (!port->ops || !port->ops->pr_set) {
1462		dev_dbg(dev, "power role swapping not supported\n");
1463		return -EOPNOTSUPP;
1464	}
1465
1466	if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
1467		dev_dbg(dev, "partner unable to swap power role\n");
1468		return -EIO;
1469	}
1470
1471	ret = sysfs_match_string(typec_roles, buf);
1472	if (ret < 0)
1473		return ret;
1474
1475	mutex_lock(&port->port_type_lock);
1476	if (port->port_type != TYPEC_PORT_DRP) {
1477		dev_dbg(dev, "port type fixed at \"%s\"",
1478			     typec_port_power_roles[port->port_type]);
1479		ret = -EOPNOTSUPP;
1480		goto unlock_and_ret;
1481	}
1482
1483	ret = port->ops->pr_set(port, ret);
1484	if (ret)
1485		goto unlock_and_ret;
1486
1487	ret = size;
1488unlock_and_ret:
1489	mutex_unlock(&port->port_type_lock);
1490	return ret;
1491}
1492
1493static ssize_t power_role_show(struct device *dev,
1494			       struct device_attribute *attr, char *buf)
1495{
1496	struct typec_port *port = to_typec_port(dev);
1497
1498	if (port->cap->type == TYPEC_PORT_DRP)
1499		return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
1500			       "[source] sink" : "source [sink]");
1501
1502	return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
1503}
1504static DEVICE_ATTR_RW(power_role);
1505
1506static ssize_t
1507port_type_store(struct device *dev, struct device_attribute *attr,
1508			const char *buf, size_t size)
1509{
1510	struct typec_port *port = to_typec_port(dev);
1511	int ret;
1512	enum typec_port_type type;
1513
1514	if (port->cap->type != TYPEC_PORT_DRP ||
1515	    !port->ops || !port->ops->port_type_set) {
1516		dev_dbg(dev, "changing port type not supported\n");
1517		return -EOPNOTSUPP;
1518	}
1519
1520	ret = sysfs_match_string(typec_port_power_roles, buf);
1521	if (ret < 0)
1522		return ret;
1523
1524	type = ret;
1525	mutex_lock(&port->port_type_lock);
1526
1527	if (port->port_type == type) {
1528		ret = size;
1529		goto unlock_and_ret;
1530	}
1531
1532	ret = port->ops->port_type_set(port, type);
1533	if (ret)
1534		goto unlock_and_ret;
1535
1536	port->port_type = type;
1537	ret = size;
1538
1539unlock_and_ret:
1540	mutex_unlock(&port->port_type_lock);
1541	return ret;
1542}
1543
1544static ssize_t
1545port_type_show(struct device *dev, struct device_attribute *attr,
1546		char *buf)
1547{
1548	struct typec_port *port = to_typec_port(dev);
1549
1550	if (port->cap->type == TYPEC_PORT_DRP)
1551		return sprintf(buf, "%s\n",
1552			       typec_port_types_drp[port->port_type]);
1553
1554	return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
1555}
1556static DEVICE_ATTR_RW(port_type);
1557
1558static const char * const typec_pwr_opmodes[] = {
1559	[TYPEC_PWR_MODE_USB]	= "default",
1560	[TYPEC_PWR_MODE_1_5A]	= "1.5A",
1561	[TYPEC_PWR_MODE_3_0A]	= "3.0A",
1562	[TYPEC_PWR_MODE_PD]	= "usb_power_delivery",
1563};
1564
1565static ssize_t power_operation_mode_show(struct device *dev,
1566					 struct device_attribute *attr,
1567					 char *buf)
1568{
1569	struct typec_port *port = to_typec_port(dev);
1570
1571	return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
1572}
1573static DEVICE_ATTR_RO(power_operation_mode);
1574
1575static ssize_t vconn_source_store(struct device *dev,
1576				  struct device_attribute *attr,
1577				  const char *buf, size_t size)
1578{
1579	struct typec_port *port = to_typec_port(dev);
1580	bool source;
1581	int ret;
1582
1583	if (!port->cap->pd_revision) {
1584		dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
1585		return -EOPNOTSUPP;
1586	}
1587
1588	if (!port->ops || !port->ops->vconn_set) {
1589		dev_dbg(dev, "VCONN swapping not supported\n");
1590		return -EOPNOTSUPP;
1591	}
1592
1593	ret = kstrtobool(buf, &source);
1594	if (ret)
1595		return ret;
1596
1597	ret = port->ops->vconn_set(port, (enum typec_role)source);
1598	if (ret)
1599		return ret;
1600
1601	return size;
1602}
1603
1604static ssize_t vconn_source_show(struct device *dev,
1605				 struct device_attribute *attr, char *buf)
1606{
1607	struct typec_port *port = to_typec_port(dev);
1608
1609	return sprintf(buf, "%s\n",
1610		       port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
1611}
1612static DEVICE_ATTR_RW(vconn_source);
1613
1614static ssize_t supported_accessory_modes_show(struct device *dev,
1615					      struct device_attribute *attr,
1616					      char *buf)
1617{
1618	struct typec_port *port = to_typec_port(dev);
1619	ssize_t ret = 0;
1620	int i;
1621
1622	for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
1623		if (port->cap->accessory[i])
1624			ret += sprintf(buf + ret, "%s ",
1625			       typec_accessory_modes[port->cap->accessory[i]]);
1626	}
1627
1628	if (!ret)
1629		return sprintf(buf, "none\n");
1630
1631	buf[ret - 1] = '\n';
1632
1633	return ret;
1634}
1635static DEVICE_ATTR_RO(supported_accessory_modes);
1636
1637static ssize_t usb_typec_revision_show(struct device *dev,
1638				       struct device_attribute *attr,
1639				       char *buf)
1640{
1641	struct typec_port *port = to_typec_port(dev);
1642	u16 rev = port->cap->revision;
1643
1644	return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1645}
1646static DEVICE_ATTR_RO(usb_typec_revision);
1647
1648static ssize_t usb_power_delivery_revision_show(struct device *dev,
1649						struct device_attribute *attr,
1650						char *buf)
1651{
1652	u16 rev = 0;
1653
1654	if (is_typec_partner(dev)) {
1655		struct typec_partner *partner = to_typec_partner(dev);
1656
1657		rev = partner->pd_revision;
1658	} else if (is_typec_cable(dev)) {
1659		struct typec_cable *cable = to_typec_cable(dev);
1660
1661		rev = cable->pd_revision;
1662	} else if (is_typec_port(dev)) {
1663		struct typec_port *p = to_typec_port(dev);
1664
1665		rev = p->cap->pd_revision;
1666	}
1667	return sysfs_emit(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1668}
1669
1670static ssize_t orientation_show(struct device *dev,
1671				   struct device_attribute *attr,
1672				   char *buf)
1673{
1674	struct typec_port *port = to_typec_port(dev);
1675
1676	return sprintf(buf, "%s\n", typec_orientations[port->orientation]);
1677}
1678static DEVICE_ATTR_RO(orientation);
1679
1680static struct attribute *typec_attrs[] = {
1681	&dev_attr_data_role.attr,
1682	&dev_attr_power_operation_mode.attr,
1683	&dev_attr_power_role.attr,
1684	&dev_attr_preferred_role.attr,
1685	&dev_attr_supported_accessory_modes.attr,
1686	&dev_attr_usb_power_delivery_revision.attr,
1687	&dev_attr_usb_typec_revision.attr,
1688	&dev_attr_vconn_source.attr,
1689	&dev_attr_port_type.attr,
1690	&dev_attr_orientation.attr,
1691	NULL,
1692};
1693
1694static umode_t typec_attr_is_visible(struct kobject *kobj,
1695				     struct attribute *attr, int n)
1696{
1697	struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1698
1699	if (attr == &dev_attr_data_role.attr) {
1700		if (port->cap->data != TYPEC_PORT_DRD ||
1701		    !port->ops || !port->ops->dr_set)
1702			return 0444;
1703	} else if (attr == &dev_attr_power_role.attr) {
1704		if (port->cap->type != TYPEC_PORT_DRP ||
1705		    !port->ops || !port->ops->pr_set)
1706			return 0444;
1707	} else if (attr == &dev_attr_vconn_source.attr) {
1708		if (!port->cap->pd_revision ||
1709		    !port->ops || !port->ops->vconn_set)
1710			return 0444;
1711	} else if (attr == &dev_attr_preferred_role.attr) {
1712		if (port->cap->type != TYPEC_PORT_DRP ||
1713		    !port->ops || !port->ops->try_role)
1714			return 0444;
1715	} else if (attr == &dev_attr_port_type.attr) {
1716		if (!port->ops || !port->ops->port_type_set)
1717			return 0;
1718		if (port->cap->type != TYPEC_PORT_DRP)
1719			return 0444;
1720	} else if (attr == &dev_attr_orientation.attr) {
1721		if (port->cap->orientation_aware)
1722			return 0444;
1723		return 0;
1724	}
1725
1726	return attr->mode;
1727}
1728
1729static const struct attribute_group typec_group = {
1730	.is_visible = typec_attr_is_visible,
1731	.attrs = typec_attrs,
1732};
1733
1734static const struct attribute_group *typec_groups[] = {
1735	&typec_group,
1736	&pd_group,
1737	NULL
1738};
1739
1740static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
1741{
1742	int ret;
1743
1744	ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
1745	if (ret)
1746		dev_err(dev, "failed to add uevent TYPEC_PORT\n");
1747
1748	return ret;
1749}
1750
1751static void typec_release(struct device *dev)
1752{
1753	struct typec_port *port = to_typec_port(dev);
1754
1755	ida_simple_remove(&typec_index_ida, port->id);
1756	ida_destroy(&port->mode_ids);
1757	typec_switch_put(port->sw);
1758	typec_mux_put(port->mux);
1759	typec_retimer_put(port->retimer);
1760	kfree(port->cap);
1761	kfree(port);
1762}
1763
1764const struct device_type typec_port_dev_type = {
1765	.name = "typec_port",
1766	.groups = typec_groups,
1767	.uevent = typec_uevent,
1768	.release = typec_release,
1769};
1770
1771/* --------------------------------------- */
1772/* Driver callbacks to report role updates */
1773
1774static int partner_match(struct device *dev, void *data)
1775{
1776	return is_typec_partner(dev);
1777}
1778
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1779/**
1780 * typec_set_data_role - Report data role change
1781 * @port: The USB Type-C Port where the role was changed
1782 * @role: The new data role
1783 *
1784 * This routine is used by the port drivers to report data role changes.
1785 */
1786void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
1787{
1788	struct device *partner_dev;
1789
1790	if (port->data_role == role)
1791		return;
1792
1793	port->data_role = role;
1794	sysfs_notify(&port->dev.kobj, NULL, "data_role");
1795	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1796
1797	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1798	if (!partner_dev)
1799		return;
1800
1801	if (to_typec_partner(partner_dev)->identity)
1802		typec_product_type_notify(partner_dev);
1803
1804	put_device(partner_dev);
1805}
1806EXPORT_SYMBOL_GPL(typec_set_data_role);
1807
1808/**
1809 * typec_set_pwr_role - Report power role change
1810 * @port: The USB Type-C Port where the role was changed
1811 * @role: The new data role
1812 *
1813 * This routine is used by the port drivers to report power role changes.
1814 */
1815void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
1816{
1817	if (port->pwr_role == role)
1818		return;
1819
1820	port->pwr_role = role;
1821	sysfs_notify(&port->dev.kobj, NULL, "power_role");
1822	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1823}
1824EXPORT_SYMBOL_GPL(typec_set_pwr_role);
1825
1826/**
1827 * typec_set_vconn_role - Report VCONN source change
1828 * @port: The USB Type-C Port which VCONN role changed
1829 * @role: Source when @port is sourcing VCONN, or Sink when it's not
1830 *
1831 * This routine is used by the port drivers to report if the VCONN source is
1832 * changes.
1833 */
1834void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
1835{
1836	if (port->vconn_role == role)
1837		return;
1838
1839	port->vconn_role = role;
1840	sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
1841	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1842}
1843EXPORT_SYMBOL_GPL(typec_set_vconn_role);
1844
1845/**
1846 * typec_set_pwr_opmode - Report changed power operation mode
1847 * @port: The USB Type-C Port where the mode was changed
1848 * @opmode: New power operation mode
1849 *
1850 * This routine is used by the port drivers to report changed power operation
1851 * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
1852 * Type-C specification, and "USB Power Delivery" when the power levels are
1853 * negotiated with methods defined in USB Power Delivery specification.
1854 */
1855void typec_set_pwr_opmode(struct typec_port *port,
1856			  enum typec_pwr_opmode opmode)
1857{
1858	struct device *partner_dev;
1859
1860	if (port->pwr_opmode == opmode)
1861		return;
1862
1863	port->pwr_opmode = opmode;
1864	sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
1865	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1866
1867	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1868	if (partner_dev) {
1869		struct typec_partner *partner = to_typec_partner(partner_dev);
1870
1871		if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
1872			partner->usb_pd = 1;
1873			sysfs_notify(&partner_dev->kobj, NULL,
1874				     "supports_usb_power_delivery");
1875			kobject_uevent(&partner_dev->kobj, KOBJ_CHANGE);
1876		}
1877		put_device(partner_dev);
1878	}
1879}
1880EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
1881
1882/**
1883 * typec_find_pwr_opmode - Get the typec power operation mode capability
1884 * @name: power operation mode string
1885 *
1886 * This routine is used to find the typec_pwr_opmode by its string @name.
1887 *
1888 * Returns typec_pwr_opmode if success, otherwise negative error code.
1889 */
1890int typec_find_pwr_opmode(const char *name)
1891{
1892	return match_string(typec_pwr_opmodes,
1893			    ARRAY_SIZE(typec_pwr_opmodes), name);
1894}
1895EXPORT_SYMBOL_GPL(typec_find_pwr_opmode);
1896
1897/**
1898 * typec_find_orientation - Convert orientation string to enum typec_orientation
1899 * @name: Orientation string
1900 *
1901 * This routine is used to find the typec_orientation by its string name @name.
1902 *
1903 * Returns the orientation value on success, otherwise negative error code.
1904 */
1905int typec_find_orientation(const char *name)
1906{
1907	return match_string(typec_orientations, ARRAY_SIZE(typec_orientations),
1908			    name);
1909}
1910EXPORT_SYMBOL_GPL(typec_find_orientation);
1911
1912/**
1913 * typec_find_port_power_role - Get the typec port power capability
1914 * @name: port power capability string
1915 *
1916 * This routine is used to find the typec_port_type by its string name.
1917 *
1918 * Returns typec_port_type if success, otherwise negative error code.
1919 */
1920int typec_find_port_power_role(const char *name)
1921{
1922	return match_string(typec_port_power_roles,
1923			    ARRAY_SIZE(typec_port_power_roles), name);
1924}
1925EXPORT_SYMBOL_GPL(typec_find_port_power_role);
1926
1927/**
1928 * typec_find_power_role - Find the typec one specific power role
1929 * @name: power role string
1930 *
1931 * This routine is used to find the typec_role by its string name.
1932 *
1933 * Returns typec_role if success, otherwise negative error code.
1934 */
1935int typec_find_power_role(const char *name)
1936{
1937	return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
1938}
1939EXPORT_SYMBOL_GPL(typec_find_power_role);
1940
1941/**
1942 * typec_find_port_data_role - Get the typec port data capability
1943 * @name: port data capability string
1944 *
1945 * This routine is used to find the typec_port_data by its string name.
1946 *
1947 * Returns typec_port_data if success, otherwise negative error code.
1948 */
1949int typec_find_port_data_role(const char *name)
1950{
1951	return match_string(typec_port_data_roles,
1952			    ARRAY_SIZE(typec_port_data_roles), name);
1953}
1954EXPORT_SYMBOL_GPL(typec_find_port_data_role);
1955
1956/* ------------------------------------------ */
1957/* API for Multiplexer/DeMultiplexer Switches */
1958
1959/**
1960 * typec_set_orientation - Set USB Type-C cable plug orientation
1961 * @port: USB Type-C Port
1962 * @orientation: USB Type-C cable plug orientation
1963 *
1964 * Set cable plug orientation for @port.
1965 */
1966int typec_set_orientation(struct typec_port *port,
1967			  enum typec_orientation orientation)
1968{
1969	int ret;
1970
1971	ret = typec_switch_set(port->sw, orientation);
1972	if (ret)
1973		return ret;
1974
1975	port->orientation = orientation;
1976	sysfs_notify(&port->dev.kobj, NULL, "orientation");
1977	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1978
1979	return 0;
1980}
1981EXPORT_SYMBOL_GPL(typec_set_orientation);
1982
1983/**
1984 * typec_get_orientation - Get USB Type-C cable plug orientation
1985 * @port: USB Type-C Port
1986 *
1987 * Get current cable plug orientation for @port.
1988 */
1989enum typec_orientation typec_get_orientation(struct typec_port *port)
1990{
1991	return port->orientation;
1992}
1993EXPORT_SYMBOL_GPL(typec_get_orientation);
1994
1995/**
1996 * typec_set_mode - Set mode of operation for USB Type-C connector
1997 * @port: USB Type-C connector
1998 * @mode: Accessory Mode, USB Operation or Safe State
1999 *
2000 * Configure @port for Accessory Mode @mode. This function will configure the
2001 * muxes needed for @mode.
2002 */
2003int typec_set_mode(struct typec_port *port, int mode)
2004{
2005	struct typec_mux_state state = { };
2006
2007	state.mode = mode;
2008
2009	return typec_mux_set(port->mux, &state);
2010}
2011EXPORT_SYMBOL_GPL(typec_set_mode);
2012
2013/* --------------------------------------- */
2014
2015/**
2016 * typec_get_negotiated_svdm_version - Get negotiated SVDM Version
2017 * @port: USB Type-C Port.
2018 *
2019 * Get the negotiated SVDM Version. The Version is set to the port default
2020 * value stored in typec_capability on partner registration, and updated after
2021 * a successful Discover Identity if the negotiated value is less than the
2022 * default value.
2023 *
2024 * Returns usb_pd_svdm_ver if the partner has been registered otherwise -ENODEV.
2025 */
2026int typec_get_negotiated_svdm_version(struct typec_port *port)
2027{
2028	enum usb_pd_svdm_ver svdm_version;
2029	struct device *partner_dev;
2030
2031	partner_dev = device_find_child(&port->dev, NULL, partner_match);
2032	if (!partner_dev)
2033		return -ENODEV;
2034
2035	svdm_version = to_typec_partner(partner_dev)->svdm_version;
2036	put_device(partner_dev);
2037
2038	return svdm_version;
2039}
2040EXPORT_SYMBOL_GPL(typec_get_negotiated_svdm_version);
2041
2042/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2043 * typec_get_drvdata - Return private driver data pointer
2044 * @port: USB Type-C port
2045 */
2046void *typec_get_drvdata(struct typec_port *port)
2047{
2048	return dev_get_drvdata(&port->dev);
2049}
2050EXPORT_SYMBOL_GPL(typec_get_drvdata);
2051
2052int typec_get_fw_cap(struct typec_capability *cap,
2053		     struct fwnode_handle *fwnode)
2054{
2055	const char *cap_str;
2056	int ret;
2057
2058	cap->fwnode = fwnode;
2059
2060	ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
2061	if (ret < 0)
2062		return ret;
2063
2064	ret = typec_find_port_power_role(cap_str);
2065	if (ret < 0)
2066		return ret;
2067	cap->type = ret;
2068
2069	/* USB data support is optional */
2070	ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
2071	if (ret == 0) {
2072		ret = typec_find_port_data_role(cap_str);
2073		if (ret < 0)
2074			return ret;
2075		cap->data = ret;
2076	}
2077
2078	/* Get the preferred power role for a DRP */
2079	if (cap->type == TYPEC_PORT_DRP) {
2080		cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
2081
2082		ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
2083		if (ret == 0) {
2084			ret = typec_find_power_role(cap_str);
2085			if (ret < 0)
2086				return ret;
2087			cap->prefer_role = ret;
2088		}
2089	}
2090
2091	return 0;
2092}
2093EXPORT_SYMBOL_GPL(typec_get_fw_cap);
2094
2095/**
2096 * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
2097 * @port: USB Type-C Port that supports the alternate mode
2098 * @desc: Description of the alternate mode
2099 *
2100 * This routine is used to register an alternate mode that @port is capable of
2101 * supporting.
2102 *
2103 * Returns handle to the alternate mode on success or ERR_PTR on failure.
2104 */
2105struct typec_altmode *
2106typec_port_register_altmode(struct typec_port *port,
2107			    const struct typec_altmode_desc *desc)
2108{
2109	struct typec_altmode *adev;
2110	struct typec_mux *mux;
 
2111
2112	mux = typec_mux_get(&port->dev, desc);
2113	if (IS_ERR(mux))
2114		return ERR_CAST(mux);
2115
 
 
 
 
 
 
2116	adev = typec_register_altmode(&port->dev, desc);
2117	if (IS_ERR(adev))
 
2118		typec_mux_put(mux);
2119	else
2120		to_altmode(adev)->mux = mux;
 
 
2121
2122	return adev;
2123}
2124EXPORT_SYMBOL_GPL(typec_port_register_altmode);
2125
2126void typec_port_register_altmodes(struct typec_port *port,
2127	const struct typec_altmode_ops *ops, void *drvdata,
2128	struct typec_altmode **altmodes, size_t n)
2129{
2130	struct fwnode_handle *altmodes_node, *child;
2131	struct typec_altmode_desc desc;
2132	struct typec_altmode *alt;
2133	size_t index = 0;
2134	u32 svid, vdo;
 
2135	int ret;
2136
2137	altmodes_node = device_get_named_child_node(&port->dev, "altmodes");
2138	if (!altmodes_node)
2139		return; /* No altmodes specified */
2140
2141	fwnode_for_each_child_node(altmodes_node, child) {
2142		ret = fwnode_property_read_u32(child, "svid", &svid);
2143		if (ret) {
2144			dev_err(&port->dev, "Error reading svid for altmode %s\n",
2145				fwnode_get_name(child));
2146			continue;
2147		}
2148
2149		ret = fwnode_property_read_u32(child, "vdo", &vdo);
2150		if (ret) {
2151			dev_err(&port->dev, "Error reading vdo for altmode %s\n",
2152				fwnode_get_name(child));
2153			continue;
2154		}
2155
2156		if (index >= n) {
2157			dev_err(&port->dev, "Error not enough space for altmode %s\n",
2158				fwnode_get_name(child));
2159			continue;
2160		}
2161
2162		desc.svid = svid;
2163		desc.vdo = vdo;
2164		desc.mode = index + 1;
2165		alt = typec_port_register_altmode(port, &desc);
2166		if (IS_ERR(alt)) {
2167			dev_err(&port->dev, "Error registering altmode %s\n",
2168				fwnode_get_name(child));
2169			continue;
2170		}
2171
2172		alt->ops = ops;
2173		typec_altmode_set_drvdata(alt, drvdata);
2174		altmodes[index] = alt;
2175		index++;
2176	}
2177}
2178EXPORT_SYMBOL_GPL(typec_port_register_altmodes);
2179
2180/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2181 * typec_register_port - Register a USB Type-C Port
2182 * @parent: Parent device
2183 * @cap: Description of the port
2184 *
2185 * Registers a device for USB Type-C Port described in @cap.
2186 *
2187 * Returns handle to the port on success or ERR_PTR on failure.
2188 */
2189struct typec_port *typec_register_port(struct device *parent,
2190				       const struct typec_capability *cap)
2191{
2192	struct typec_port *port;
2193	int ret;
2194	int id;
2195
2196	port = kzalloc(sizeof(*port), GFP_KERNEL);
2197	if (!port)
2198		return ERR_PTR(-ENOMEM);
2199
2200	id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
2201	if (id < 0) {
2202		kfree(port);
2203		return ERR_PTR(id);
2204	}
2205
2206	switch (cap->type) {
2207	case TYPEC_PORT_SRC:
2208		port->pwr_role = TYPEC_SOURCE;
2209		port->vconn_role = TYPEC_SOURCE;
2210		break;
2211	case TYPEC_PORT_SNK:
2212		port->pwr_role = TYPEC_SINK;
2213		port->vconn_role = TYPEC_SINK;
2214		break;
2215	case TYPEC_PORT_DRP:
2216		if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
2217			port->pwr_role = cap->prefer_role;
2218		else
2219			port->pwr_role = TYPEC_SINK;
2220		break;
2221	}
2222
2223	switch (cap->data) {
2224	case TYPEC_PORT_DFP:
2225		port->data_role = TYPEC_HOST;
2226		break;
2227	case TYPEC_PORT_UFP:
2228		port->data_role = TYPEC_DEVICE;
2229		break;
2230	case TYPEC_PORT_DRD:
2231		if (cap->prefer_role == TYPEC_SOURCE)
2232			port->data_role = TYPEC_HOST;
2233		else
2234			port->data_role = TYPEC_DEVICE;
2235		break;
2236	}
2237
2238	ida_init(&port->mode_ids);
2239	mutex_init(&port->port_type_lock);
2240
2241	port->id = id;
2242	port->ops = cap->ops;
2243	port->port_type = cap->type;
2244	port->prefer_role = cap->prefer_role;
 
 
2245
2246	device_initialize(&port->dev);
2247	port->dev.class = &typec_class;
2248	port->dev.parent = parent;
2249	port->dev.fwnode = cap->fwnode;
2250	port->dev.type = &typec_port_dev_type;
2251	dev_set_name(&port->dev, "port%d", id);
2252	dev_set_drvdata(&port->dev, cap->driver_data);
2253
2254	port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
2255	if (!port->cap) {
2256		put_device(&port->dev);
2257		return ERR_PTR(-ENOMEM);
2258	}
2259
2260	port->sw = typec_switch_get(&port->dev);
2261	if (IS_ERR(port->sw)) {
2262		ret = PTR_ERR(port->sw);
2263		put_device(&port->dev);
2264		return ERR_PTR(ret);
2265	}
2266
2267	port->mux = typec_mux_get(&port->dev, NULL);
2268	if (IS_ERR(port->mux)) {
2269		ret = PTR_ERR(port->mux);
2270		put_device(&port->dev);
2271		return ERR_PTR(ret);
2272	}
2273
2274	port->retimer = typec_retimer_get(&port->dev);
2275	if (IS_ERR(port->retimer)) {
2276		ret = PTR_ERR(port->retimer);
2277		put_device(&port->dev);
2278		return ERR_PTR(ret);
2279	}
2280
 
 
2281	ret = device_add(&port->dev);
2282	if (ret) {
2283		dev_err(parent, "failed to register port (%d)\n", ret);
2284		put_device(&port->dev);
2285		return ERR_PTR(ret);
2286	}
2287
2288	ret = typec_port_set_usb_power_delivery(port, cap->pd);
2289	if (ret) {
2290		dev_err(&port->dev, "failed to link pd\n");
2291		device_unregister(&port->dev);
2292		return ERR_PTR(ret);
2293	}
2294
2295	ret = typec_link_ports(port);
2296	if (ret)
2297		dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret);
2298
2299	return port;
2300}
2301EXPORT_SYMBOL_GPL(typec_register_port);
2302
2303/**
2304 * typec_unregister_port - Unregister a USB Type-C Port
2305 * @port: The port to be unregistered
2306 *
2307 * Unregister device created with typec_register_port().
2308 */
2309void typec_unregister_port(struct typec_port *port)
2310{
2311	if (!IS_ERR_OR_NULL(port)) {
2312		typec_unlink_ports(port);
2313		typec_port_set_usb_power_delivery(port, NULL);
2314		device_unregister(&port->dev);
2315	}
2316}
2317EXPORT_SYMBOL_GPL(typec_unregister_port);
2318
2319static int __init typec_init(void)
2320{
2321	int ret;
2322
2323	ret = bus_register(&typec_bus);
2324	if (ret)
2325		return ret;
2326
2327	ret = class_register(&typec_mux_class);
2328	if (ret)
2329		goto err_unregister_bus;
2330
2331	ret = class_register(&retimer_class);
2332	if (ret)
2333		goto err_unregister_mux_class;
2334
2335	ret = class_register(&typec_class);
2336	if (ret)
2337		goto err_unregister_retimer_class;
2338
2339	ret = usb_power_delivery_init();
2340	if (ret)
2341		goto err_unregister_class;
2342
2343	return 0;
2344
2345err_unregister_class:
2346	class_unregister(&typec_class);
2347
2348err_unregister_retimer_class:
2349	class_unregister(&retimer_class);
2350
2351err_unregister_mux_class:
2352	class_unregister(&typec_mux_class);
2353
2354err_unregister_bus:
2355	bus_unregister(&typec_bus);
2356
2357	return ret;
2358}
2359subsys_initcall(typec_init);
2360
2361static void __exit typec_exit(void)
2362{
2363	usb_power_delivery_exit();
2364	class_unregister(&typec_class);
2365	ida_destroy(&typec_index_ida);
2366	bus_unregister(&typec_bus);
2367	class_unregister(&typec_mux_class);
2368	class_unregister(&retimer_class);
2369}
2370module_exit(typec_exit);
2371
2372MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
2373MODULE_LICENSE("GPL v2");
2374MODULE_DESCRIPTION("USB Type-C Connector Class");