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 21 static DEFINE_IDA(typec_index_ida); 22 23 struct class typec_class = { 24 .name = "typec", 25 }; 26 27 /* ------------------------------------------------------------------------- */ 28 /* Common attributes */ 29 30 static const char * const typec_accessory_modes[] = { 31 [TYPEC_ACCESSORY_NONE] = "none", 32 [TYPEC_ACCESSORY_AUDIO] = "analog_audio", 33 [TYPEC_ACCESSORY_DEBUG] = "debug", 34 }; 35 36 /* Product types defined in USB PD Specification R3.0 V2.0 */ 37 static const char * const product_type_ufp[8] = { 38 [IDH_PTYPE_NOT_UFP] = "not_ufp", 39 [IDH_PTYPE_HUB] = "hub", 40 [IDH_PTYPE_PERIPH] = "peripheral", 41 [IDH_PTYPE_PSD] = "psd", 42 [IDH_PTYPE_AMA] = "ama", 43 }; 44 45 static const char * const product_type_dfp[8] = { 46 [IDH_PTYPE_NOT_DFP] = "not_dfp", 47 [IDH_PTYPE_DFP_HUB] = "hub", 48 [IDH_PTYPE_DFP_HOST] = "host", 49 [IDH_PTYPE_DFP_PB] = "power_brick", 50 }; 51 52 static const char * const product_type_cable[8] = { 53 [IDH_PTYPE_NOT_CABLE] = "not_cable", 54 [IDH_PTYPE_PCABLE] = "passive", 55 [IDH_PTYPE_ACABLE] = "active", 56 [IDH_PTYPE_VPD] = "vpd", 57 }; 58 59 static struct usb_pd_identity *get_pd_identity(struct device *dev) 60 { 61 if (is_typec_partner(dev)) { 62 struct typec_partner *partner = to_typec_partner(dev); 63 64 return partner->identity; 65 } else if (is_typec_cable(dev)) { 66 struct typec_cable *cable = to_typec_cable(dev); 67 68 return cable->identity; 69 } 70 return NULL; 71 } 72 73 static const char *get_pd_product_type(struct device *dev) 74 { 75 struct typec_port *port = to_typec_port(dev->parent); 76 struct usb_pd_identity *id = get_pd_identity(dev); 77 const char *ptype = NULL; 78 79 if (is_typec_partner(dev)) { 80 if (!id) 81 return NULL; 82 83 if (port->data_role == TYPEC_HOST) 84 ptype = product_type_ufp[PD_IDH_PTYPE(id->id_header)]; 85 else 86 ptype = product_type_dfp[PD_IDH_DFP_PTYPE(id->id_header)]; 87 } else if (is_typec_cable(dev)) { 88 if (id) 89 ptype = product_type_cable[PD_IDH_PTYPE(id->id_header)]; 90 else 91 ptype = to_typec_cable(dev)->active ? 92 product_type_cable[IDH_PTYPE_ACABLE] : 93 product_type_cable[IDH_PTYPE_PCABLE]; 94 } 95 96 return ptype; 97 } 98 99 static ssize_t id_header_show(struct device *dev, struct device_attribute *attr, 100 char *buf) 101 { 102 struct usb_pd_identity *id = get_pd_identity(dev); 103 104 return sprintf(buf, "0x%08x\n", id->id_header); 105 } 106 static DEVICE_ATTR_RO(id_header); 107 108 static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr, 109 char *buf) 110 { 111 struct usb_pd_identity *id = get_pd_identity(dev); 112 113 return sprintf(buf, "0x%08x\n", id->cert_stat); 114 } 115 static DEVICE_ATTR_RO(cert_stat); 116 117 static ssize_t product_show(struct device *dev, struct device_attribute *attr, 118 char *buf) 119 { 120 struct usb_pd_identity *id = get_pd_identity(dev); 121 122 return sprintf(buf, "0x%08x\n", id->product); 123 } 124 static DEVICE_ATTR_RO(product); 125 126 static ssize_t product_type_vdo1_show(struct device *dev, struct device_attribute *attr, 127 char *buf) 128 { 129 struct usb_pd_identity *id = get_pd_identity(dev); 130 131 return sysfs_emit(buf, "0x%08x\n", id->vdo[0]); 132 } 133 static DEVICE_ATTR_RO(product_type_vdo1); 134 135 static ssize_t product_type_vdo2_show(struct device *dev, struct device_attribute *attr, 136 char *buf) 137 { 138 struct usb_pd_identity *id = get_pd_identity(dev); 139 140 return sysfs_emit(buf, "0x%08x\n", id->vdo[1]); 141 } 142 static DEVICE_ATTR_RO(product_type_vdo2); 143 144 static ssize_t product_type_vdo3_show(struct device *dev, struct device_attribute *attr, 145 char *buf) 146 { 147 struct usb_pd_identity *id = get_pd_identity(dev); 148 149 return sysfs_emit(buf, "0x%08x\n", id->vdo[2]); 150 } 151 static DEVICE_ATTR_RO(product_type_vdo3); 152 153 static struct attribute *usb_pd_id_attrs[] = { 154 &dev_attr_id_header.attr, 155 &dev_attr_cert_stat.attr, 156 &dev_attr_product.attr, 157 &dev_attr_product_type_vdo1.attr, 158 &dev_attr_product_type_vdo2.attr, 159 &dev_attr_product_type_vdo3.attr, 160 NULL 161 }; 162 163 static const struct attribute_group usb_pd_id_group = { 164 .name = "identity", 165 .attrs = usb_pd_id_attrs, 166 }; 167 168 static const struct attribute_group *usb_pd_id_groups[] = { 169 &usb_pd_id_group, 170 NULL, 171 }; 172 173 static void typec_product_type_notify(struct device *dev) 174 { 175 char *envp[2] = { }; 176 const char *ptype; 177 178 ptype = get_pd_product_type(dev); 179 if (!ptype) 180 return; 181 182 sysfs_notify(&dev->kobj, NULL, "type"); 183 184 envp[0] = kasprintf(GFP_KERNEL, "PRODUCT_TYPE=%s", ptype); 185 if (!envp[0]) 186 return; 187 188 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 189 kfree(envp[0]); 190 } 191 192 static void typec_report_identity(struct device *dev) 193 { 194 sysfs_notify(&dev->kobj, "identity", "id_header"); 195 sysfs_notify(&dev->kobj, "identity", "cert_stat"); 196 sysfs_notify(&dev->kobj, "identity", "product"); 197 sysfs_notify(&dev->kobj, "identity", "product_type_vdo1"); 198 sysfs_notify(&dev->kobj, "identity", "product_type_vdo2"); 199 sysfs_notify(&dev->kobj, "identity", "product_type_vdo3"); 200 typec_product_type_notify(dev); 201 } 202 203 static ssize_t 204 type_show(struct device *dev, struct device_attribute *attr, char *buf) 205 { 206 const char *ptype; 207 208 ptype = get_pd_product_type(dev); 209 if (!ptype) 210 return 0; 211 212 return sysfs_emit(buf, "%s\n", ptype); 213 } 214 static DEVICE_ATTR_RO(type); 215 216 static ssize_t usb_power_delivery_revision_show(struct device *dev, 217 struct device_attribute *attr, 218 char *buf); 219 static DEVICE_ATTR_RO(usb_power_delivery_revision); 220 221 /* ------------------------------------------------------------------------- */ 222 /* Alternate Modes */ 223 224 static int altmode_match(struct device *dev, void *data) 225 { 226 struct typec_altmode *adev = to_typec_altmode(dev); 227 struct typec_device_id *id = data; 228 229 if (!is_typec_altmode(dev)) 230 return 0; 231 232 return ((adev->svid == id->svid) && (adev->mode == id->mode)); 233 } 234 235 static void typec_altmode_set_partner(struct altmode *altmode) 236 { 237 struct typec_altmode *adev = &altmode->adev; 238 struct typec_device_id id = { adev->svid, adev->mode, }; 239 struct typec_port *port = typec_altmode2port(adev); 240 struct altmode *partner; 241 struct device *dev; 242 243 dev = device_find_child(&port->dev, &id, altmode_match); 244 if (!dev) 245 return; 246 247 /* Bind the port alt mode to the partner/plug alt mode. */ 248 partner = to_altmode(to_typec_altmode(dev)); 249 altmode->partner = partner; 250 251 /* Bind the partner/plug alt mode to the port alt mode. */ 252 if (is_typec_plug(adev->dev.parent)) { 253 struct typec_plug *plug = to_typec_plug(adev->dev.parent); 254 255 partner->plug[plug->index] = altmode; 256 } else { 257 partner->partner = altmode; 258 } 259 } 260 261 static void typec_altmode_put_partner(struct altmode *altmode) 262 { 263 struct altmode *partner = altmode->partner; 264 struct typec_altmode *adev; 265 266 if (!partner) 267 return; 268 269 adev = &partner->adev; 270 271 if (is_typec_plug(adev->dev.parent)) { 272 struct typec_plug *plug = to_typec_plug(adev->dev.parent); 273 274 partner->plug[plug->index] = NULL; 275 } else { 276 partner->partner = NULL; 277 } 278 put_device(&adev->dev); 279 } 280 281 /** 282 * typec_altmode_update_active - Report Enter/Exit mode 283 * @adev: Handle to the alternate mode 284 * @active: True when the mode has been entered 285 * 286 * If a partner or cable plug executes Enter/Exit Mode command successfully, the 287 * drivers use this routine to report the updated state of the mode. 288 */ 289 void typec_altmode_update_active(struct typec_altmode *adev, bool active) 290 { 291 char dir[6]; 292 293 if (adev->active == active) 294 return; 295 296 if (!is_typec_port(adev->dev.parent) && adev->dev.driver) { 297 if (!active) 298 module_put(adev->dev.driver->owner); 299 else 300 WARN_ON(!try_module_get(adev->dev.driver->owner)); 301 } 302 303 adev->active = active; 304 snprintf(dir, sizeof(dir), "mode%d", adev->mode); 305 sysfs_notify(&adev->dev.kobj, dir, "active"); 306 sysfs_notify(&adev->dev.kobj, NULL, "active"); 307 kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE); 308 } 309 EXPORT_SYMBOL_GPL(typec_altmode_update_active); 310 311 /** 312 * typec_altmode2port - Alternate Mode to USB Type-C port 313 * @alt: The Alternate Mode 314 * 315 * Returns handle to the port that a cable plug or partner with @alt is 316 * connected to. 317 */ 318 struct typec_port *typec_altmode2port(struct typec_altmode *alt) 319 { 320 if (is_typec_plug(alt->dev.parent)) 321 return to_typec_port(alt->dev.parent->parent->parent); 322 if (is_typec_partner(alt->dev.parent)) 323 return to_typec_port(alt->dev.parent->parent); 324 if (is_typec_port(alt->dev.parent)) 325 return to_typec_port(alt->dev.parent); 326 327 return NULL; 328 } 329 EXPORT_SYMBOL_GPL(typec_altmode2port); 330 331 static ssize_t 332 vdo_show(struct device *dev, struct device_attribute *attr, char *buf) 333 { 334 struct typec_altmode *alt = to_typec_altmode(dev); 335 336 return sprintf(buf, "0x%08x\n", alt->vdo); 337 } 338 static DEVICE_ATTR_RO(vdo); 339 340 static ssize_t 341 description_show(struct device *dev, struct device_attribute *attr, char *buf) 342 { 343 struct typec_altmode *alt = to_typec_altmode(dev); 344 345 return sprintf(buf, "%s\n", alt->desc ? alt->desc : ""); 346 } 347 static DEVICE_ATTR_RO(description); 348 349 static ssize_t 350 active_show(struct device *dev, struct device_attribute *attr, char *buf) 351 { 352 struct typec_altmode *alt = to_typec_altmode(dev); 353 354 return sprintf(buf, "%s\n", alt->active ? "yes" : "no"); 355 } 356 357 static ssize_t active_store(struct device *dev, struct device_attribute *attr, 358 const char *buf, size_t size) 359 { 360 struct typec_altmode *adev = to_typec_altmode(dev); 361 struct altmode *altmode = to_altmode(adev); 362 bool enter; 363 int ret; 364 365 ret = kstrtobool(buf, &enter); 366 if (ret) 367 return ret; 368 369 if (adev->active == enter) 370 return size; 371 372 if (is_typec_port(adev->dev.parent)) { 373 typec_altmode_update_active(adev, enter); 374 375 /* Make sure that the partner exits the mode before disabling */ 376 if (altmode->partner && !enter && altmode->partner->adev.active) 377 typec_altmode_exit(&altmode->partner->adev); 378 } else if (altmode->partner) { 379 if (enter && !altmode->partner->adev.active) { 380 dev_warn(dev, "port has the mode disabled\n"); 381 return -EPERM; 382 } 383 } 384 385 /* Note: If there is no driver, the mode will not be entered */ 386 if (adev->ops && adev->ops->activate) { 387 ret = adev->ops->activate(adev, enter); 388 if (ret) 389 return ret; 390 } 391 392 return size; 393 } 394 static DEVICE_ATTR_RW(active); 395 396 static ssize_t 397 supported_roles_show(struct device *dev, struct device_attribute *attr, 398 char *buf) 399 { 400 struct altmode *alt = to_altmode(to_typec_altmode(dev)); 401 ssize_t ret; 402 403 switch (alt->roles) { 404 case TYPEC_PORT_SRC: 405 ret = sprintf(buf, "source\n"); 406 break; 407 case TYPEC_PORT_SNK: 408 ret = sprintf(buf, "sink\n"); 409 break; 410 case TYPEC_PORT_DRP: 411 default: 412 ret = sprintf(buf, "source sink\n"); 413 break; 414 } 415 return ret; 416 } 417 static DEVICE_ATTR_RO(supported_roles); 418 419 static ssize_t 420 mode_show(struct device *dev, struct device_attribute *attr, char *buf) 421 { 422 struct typec_altmode *adev = to_typec_altmode(dev); 423 424 return sprintf(buf, "%u\n", adev->mode); 425 } 426 static DEVICE_ATTR_RO(mode); 427 428 static ssize_t 429 svid_show(struct device *dev, struct device_attribute *attr, char *buf) 430 { 431 struct typec_altmode *adev = to_typec_altmode(dev); 432 433 return sprintf(buf, "%04x\n", adev->svid); 434 } 435 static DEVICE_ATTR_RO(svid); 436 437 static struct attribute *typec_altmode_attrs[] = { 438 &dev_attr_active.attr, 439 &dev_attr_mode.attr, 440 &dev_attr_svid.attr, 441 &dev_attr_vdo.attr, 442 NULL 443 }; 444 445 static umode_t typec_altmode_attr_is_visible(struct kobject *kobj, 446 struct attribute *attr, int n) 447 { 448 struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj)); 449 450 if (attr == &dev_attr_active.attr) 451 if (!adev->ops || !adev->ops->activate) 452 return 0444; 453 454 return attr->mode; 455 } 456 457 static const struct attribute_group typec_altmode_group = { 458 .is_visible = typec_altmode_attr_is_visible, 459 .attrs = typec_altmode_attrs, 460 }; 461 462 static const struct attribute_group *typec_altmode_groups[] = { 463 &typec_altmode_group, 464 NULL 465 }; 466 467 static int altmode_id_get(struct device *dev) 468 { 469 struct ida *ids; 470 471 if (is_typec_partner(dev)) 472 ids = &to_typec_partner(dev)->mode_ids; 473 else if (is_typec_plug(dev)) 474 ids = &to_typec_plug(dev)->mode_ids; 475 else 476 ids = &to_typec_port(dev)->mode_ids; 477 478 return ida_simple_get(ids, 0, 0, GFP_KERNEL); 479 } 480 481 static void altmode_id_remove(struct device *dev, int id) 482 { 483 struct ida *ids; 484 485 if (is_typec_partner(dev)) 486 ids = &to_typec_partner(dev)->mode_ids; 487 else if (is_typec_plug(dev)) 488 ids = &to_typec_plug(dev)->mode_ids; 489 else 490 ids = &to_typec_port(dev)->mode_ids; 491 492 ida_simple_remove(ids, id); 493 } 494 495 static void typec_altmode_release(struct device *dev) 496 { 497 struct altmode *alt = to_altmode(to_typec_altmode(dev)); 498 499 typec_altmode_put_partner(alt); 500 501 altmode_id_remove(alt->adev.dev.parent, alt->id); 502 kfree(alt); 503 } 504 505 const struct device_type typec_altmode_dev_type = { 506 .name = "typec_alternate_mode", 507 .groups = typec_altmode_groups, 508 .release = typec_altmode_release, 509 }; 510 511 static struct typec_altmode * 512 typec_register_altmode(struct device *parent, 513 const struct typec_altmode_desc *desc) 514 { 515 unsigned int id = altmode_id_get(parent); 516 bool is_port = is_typec_port(parent); 517 struct altmode *alt; 518 int ret; 519 520 alt = kzalloc(sizeof(*alt), GFP_KERNEL); 521 if (!alt) { 522 altmode_id_remove(parent, id); 523 return ERR_PTR(-ENOMEM); 524 } 525 526 alt->adev.svid = desc->svid; 527 alt->adev.mode = desc->mode; 528 alt->adev.vdo = desc->vdo; 529 alt->roles = desc->roles; 530 alt->id = id; 531 532 alt->attrs[0] = &dev_attr_vdo.attr; 533 alt->attrs[1] = &dev_attr_description.attr; 534 alt->attrs[2] = &dev_attr_active.attr; 535 536 if (is_port) { 537 alt->attrs[3] = &dev_attr_supported_roles.attr; 538 alt->adev.active = true; /* Enabled by default */ 539 } 540 541 sprintf(alt->group_name, "mode%d", desc->mode); 542 alt->group.name = alt->group_name; 543 alt->group.attrs = alt->attrs; 544 alt->groups[0] = &alt->group; 545 546 alt->adev.dev.parent = parent; 547 alt->adev.dev.groups = alt->groups; 548 alt->adev.dev.type = &typec_altmode_dev_type; 549 dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id); 550 551 /* Link partners and plugs with the ports */ 552 if (!is_port) 553 typec_altmode_set_partner(alt); 554 555 /* The partners are bind to drivers */ 556 if (is_typec_partner(parent)) 557 alt->adev.dev.bus = &typec_bus; 558 559 /* Plug alt modes need a class to generate udev events. */ 560 if (is_typec_plug(parent)) 561 alt->adev.dev.class = &typec_class; 562 563 ret = device_register(&alt->adev.dev); 564 if (ret) { 565 dev_err(parent, "failed to register alternate mode (%d)\n", 566 ret); 567 put_device(&alt->adev.dev); 568 return ERR_PTR(ret); 569 } 570 571 return &alt->adev; 572 } 573 574 /** 575 * typec_unregister_altmode - Unregister Alternate Mode 576 * @adev: The alternate mode to be unregistered 577 * 578 * Unregister device created with typec_partner_register_altmode(), 579 * typec_plug_register_altmode() or typec_port_register_altmode(). 580 */ 581 void typec_unregister_altmode(struct typec_altmode *adev) 582 { 583 if (IS_ERR_OR_NULL(adev)) 584 return; 585 typec_retimer_put(to_altmode(adev)->retimer); 586 typec_mux_put(to_altmode(adev)->mux); 587 device_unregister(&adev->dev); 588 } 589 EXPORT_SYMBOL_GPL(typec_unregister_altmode); 590 591 /* ------------------------------------------------------------------------- */ 592 /* Type-C Partners */ 593 594 static 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 } 602 static DEVICE_ATTR_RO(accessory_mode); 603 604 static 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 } 612 static DEVICE_ATTR_RO(supports_usb_power_delivery); 613 614 static 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 } 633 static DEVICE_ATTR_RO(number_of_alternate_modes); 634 635 static 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 }; 643 644 static 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 } 659 660 static const struct attribute_group typec_partner_group = { 661 .is_visible = typec_partner_attr_is_visible, 662 .attrs = typec_partner_attrs 663 }; 664 665 static const struct attribute_group *typec_partner_groups[] = { 666 &typec_partner_group, 667 NULL 668 }; 669 670 static 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 } 677 678 const 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 */ 691 int 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 } 699 EXPORT_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 */ 709 void 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 } 723 EXPORT_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 */ 736 int 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 } 756 EXPORT_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 */ 771 int 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 } 788 EXPORT_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 */ 802 struct typec_altmode * 803 typec_partner_register_altmode(struct typec_partner *partner, 804 const struct typec_altmode_desc *desc) 805 { 806 return typec_register_altmode(&partner->dev, desc); 807 } 808 EXPORT_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 */ 817 void 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 } 822 EXPORT_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 */ 835 struct usb_power_delivery * 836 typec_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 } 841 EXPORT_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 */ 852 struct 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 } 892 EXPORT_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 */ 900 void typec_unregister_partner(struct typec_partner *partner) 901 { 902 if (!IS_ERR_OR_NULL(partner)) 903 device_unregister(&partner->dev); 904 } 905 EXPORT_SYMBOL_GPL(typec_unregister_partner); 906 907 /* ------------------------------------------------------------------------- */ 908 /* Type-C Cable Plugs */ 909 910 static 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 } 917 918 static struct attribute *typec_plug_attrs[] = { 919 &dev_attr_number_of_alternate_modes.attr, 920 NULL 921 }; 922 923 static 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 } 934 935 static const struct attribute_group typec_plug_group = { 936 .is_visible = typec_plug_attr_is_visible, 937 .attrs = typec_plug_attrs 938 }; 939 940 static const struct attribute_group *typec_plug_groups[] = { 941 &typec_plug_group, 942 NULL 943 }; 944 945 const 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 */ 964 int 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 } 981 EXPORT_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 */ 995 struct typec_altmode * 996 typec_plug_register_altmode(struct typec_plug *plug, 997 const struct typec_altmode_desc *desc) 998 { 999 return typec_register_altmode(&plug->dev, desc); 1000 } 1001 EXPORT_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 */ 1014 struct 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 } 1044 EXPORT_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 */ 1052 void typec_unregister_plug(struct typec_plug *plug) 1053 { 1054 if (!IS_ERR_OR_NULL(plug)) 1055 device_unregister(&plug->dev); 1056 } 1057 EXPORT_SYMBOL_GPL(typec_unregister_plug); 1058 1059 /* Type-C Cables */ 1060 1061 static 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 1069 static 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 } 1076 static DEVICE_ATTR_RO(plug_type); 1077 1078 static 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 }; 1084 ATTRIBUTE_GROUPS(typec_cable); 1085 1086 static void typec_cable_release(struct device *dev) 1087 { 1088 struct typec_cable *cable = to_typec_cable(dev); 1089 1090 kfree(cable); 1091 } 1092 1093 const struct device_type typec_cable_dev_type = { 1094 .name = "typec_cable", 1095 .groups = typec_cable_groups, 1096 .release = typec_cable_release, 1097 }; 1098 1099 static 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 */ 1111 struct 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 } 1121 EXPORT_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 */ 1127 void typec_cable_put(struct typec_cable *cable) 1128 { 1129 put_device(&cable->dev); 1130 } 1131 EXPORT_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 */ 1139 int typec_cable_is_active(struct typec_cable *cable) 1140 { 1141 return cable->active; 1142 } 1143 EXPORT_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 */ 1152 int 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 } 1160 EXPORT_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 */ 1172 struct 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 } 1209 EXPORT_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 */ 1217 void typec_unregister_cable(struct typec_cable *cable) 1218 { 1219 if (!IS_ERR_OR_NULL(cable)) 1220 device_unregister(&cable->dev); 1221 } 1222 EXPORT_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 */ 1237 int 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 } 1256 EXPORT_SYMBOL_GPL(typec_port_set_usb_power_delivery); 1257 1258 static 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 1275 static 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 } 1301 static DEVICE_ATTR_RW(select_usb_power_delivery); 1302 1303 static struct attribute *port_attrs[] = { 1304 &dev_attr_select_usb_power_delivery.attr, 1305 NULL 1306 }; 1307 1308 static 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 1320 static const struct attribute_group pd_group = { 1321 .is_visible = port_attr_is_visible, 1322 .attrs = port_attrs, 1323 }; 1324 1325 static const char * const typec_orientations[] = { 1326 [TYPEC_ORIENTATION_NONE] = "unknown", 1327 [TYPEC_ORIENTATION_NORMAL] = "normal", 1328 [TYPEC_ORIENTATION_REVERSE] = "reverse", 1329 }; 1330 1331 static const char * const typec_roles[] = { 1332 [TYPEC_SINK] = "sink", 1333 [TYPEC_SOURCE] = "source", 1334 }; 1335 1336 static const char * const typec_data_roles[] = { 1337 [TYPEC_DEVICE] = "device", 1338 [TYPEC_HOST] = "host", 1339 }; 1340 1341 static const char * const typec_port_power_roles[] = { 1342 [TYPEC_PORT_SRC] = "source", 1343 [TYPEC_PORT_SNK] = "sink", 1344 [TYPEC_PORT_DRP] = "dual", 1345 }; 1346 1347 static const char * const typec_port_data_roles[] = { 1348 [TYPEC_PORT_DFP] = "host", 1349 [TYPEC_PORT_UFP] = "device", 1350 [TYPEC_PORT_DRD] = "dual", 1351 }; 1352 1353 static 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 1359 static ssize_t 1360 preferred_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 1393 static ssize_t 1394 preferred_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 } 1407 static DEVICE_ATTR_RW(preferred_role); 1408 1409 static 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; 1436 unlock_and_ret: 1437 mutex_unlock(&port->port_type_lock); 1438 return ret; 1439 } 1440 1441 static 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 } 1452 static DEVICE_ATTR_RW(data_role); 1453 1454 static 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; 1488 unlock_and_ret: 1489 mutex_unlock(&port->port_type_lock); 1490 return ret; 1491 } 1492 1493 static 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 } 1504 static DEVICE_ATTR_RW(power_role); 1505 1506 static ssize_t 1507 port_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 1539 unlock_and_ret: 1540 mutex_unlock(&port->port_type_lock); 1541 return ret; 1542 } 1543 1544 static ssize_t 1545 port_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 } 1556 static DEVICE_ATTR_RW(port_type); 1557 1558 static 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 1565 static 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 } 1573 static DEVICE_ATTR_RO(power_operation_mode); 1574 1575 static 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 1604 static 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 } 1612 static DEVICE_ATTR_RW(vconn_source); 1613 1614 static 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 } 1635 static DEVICE_ATTR_RO(supported_accessory_modes); 1636 1637 static 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 } 1646 static DEVICE_ATTR_RO(usb_typec_revision); 1647 1648 static 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 1670 static 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 } 1678 static DEVICE_ATTR_RO(orientation); 1679 1680 static 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 1694 static 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 1729 static const struct attribute_group typec_group = { 1730 .is_visible = typec_attr_is_visible, 1731 .attrs = typec_attrs, 1732 }; 1733 1734 static const struct attribute_group *typec_groups[] = { 1735 &typec_group, 1736 &pd_group, 1737 NULL 1738 }; 1739 1740 static int typec_uevent(const 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 1751 static 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 1764 const 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 1774 static 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 */ 1786 void 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 } 1806 EXPORT_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 */ 1815 void 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 } 1824 EXPORT_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 */ 1834 void 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 } 1843 EXPORT_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 */ 1855 void 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 } 1880 EXPORT_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 */ 1890 int typec_find_pwr_opmode(const char *name) 1891 { 1892 return match_string(typec_pwr_opmodes, 1893 ARRAY_SIZE(typec_pwr_opmodes), name); 1894 } 1895 EXPORT_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 */ 1905 int typec_find_orientation(const char *name) 1906 { 1907 return match_string(typec_orientations, ARRAY_SIZE(typec_orientations), 1908 name); 1909 } 1910 EXPORT_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 */ 1920 int 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 } 1925 EXPORT_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 */ 1935 int typec_find_power_role(const char *name) 1936 { 1937 return match_string(typec_roles, ARRAY_SIZE(typec_roles), name); 1938 } 1939 EXPORT_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 */ 1949 int 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 } 1954 EXPORT_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 */ 1966 int 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 } 1981 EXPORT_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 */ 1989 enum typec_orientation typec_get_orientation(struct typec_port *port) 1990 { 1991 return port->orientation; 1992 } 1993 EXPORT_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 */ 2003 int 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 } 2011 EXPORT_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 */ 2026 int 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 } 2040 EXPORT_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 */ 2046 void *typec_get_drvdata(struct typec_port *port) 2047 { 2048 return dev_get_drvdata(&port->dev); 2049 } 2050 EXPORT_SYMBOL_GPL(typec_get_drvdata); 2051 2052 int 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 } 2093 EXPORT_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 */ 2105 struct typec_altmode * 2106 typec_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 struct typec_retimer *retimer; 2112 2113 mux = typec_mux_get(&port->dev); 2114 if (IS_ERR(mux)) 2115 return ERR_CAST(mux); 2116 2117 retimer = typec_retimer_get(&port->dev); 2118 if (IS_ERR(retimer)) { 2119 typec_mux_put(mux); 2120 return ERR_CAST(retimer); 2121 } 2122 2123 adev = typec_register_altmode(&port->dev, desc); 2124 if (IS_ERR(adev)) { 2125 typec_retimer_put(retimer); 2126 typec_mux_put(mux); 2127 } else { 2128 to_altmode(adev)->mux = mux; 2129 to_altmode(adev)->retimer = retimer; 2130 } 2131 2132 return adev; 2133 } 2134 EXPORT_SYMBOL_GPL(typec_port_register_altmode); 2135 2136 void typec_port_register_altmodes(struct typec_port *port, 2137 const struct typec_altmode_ops *ops, void *drvdata, 2138 struct typec_altmode **altmodes, size_t n) 2139 { 2140 struct fwnode_handle *altmodes_node, *child; 2141 struct typec_altmode_desc desc; 2142 struct typec_altmode *alt; 2143 size_t index = 0; 2144 u32 svid, vdo; 2145 int ret; 2146 2147 altmodes_node = device_get_named_child_node(&port->dev, "altmodes"); 2148 if (!altmodes_node) 2149 return; /* No altmodes specified */ 2150 2151 fwnode_for_each_child_node(altmodes_node, child) { 2152 ret = fwnode_property_read_u32(child, "svid", &svid); 2153 if (ret) { 2154 dev_err(&port->dev, "Error reading svid for altmode %s\n", 2155 fwnode_get_name(child)); 2156 continue; 2157 } 2158 2159 ret = fwnode_property_read_u32(child, "vdo", &vdo); 2160 if (ret) { 2161 dev_err(&port->dev, "Error reading vdo for altmode %s\n", 2162 fwnode_get_name(child)); 2163 continue; 2164 } 2165 2166 if (index >= n) { 2167 dev_err(&port->dev, "Error not enough space for altmode %s\n", 2168 fwnode_get_name(child)); 2169 continue; 2170 } 2171 2172 desc.svid = svid; 2173 desc.vdo = vdo; 2174 desc.mode = index + 1; 2175 alt = typec_port_register_altmode(port, &desc); 2176 if (IS_ERR(alt)) { 2177 dev_err(&port->dev, "Error registering altmode %s\n", 2178 fwnode_get_name(child)); 2179 continue; 2180 } 2181 2182 alt->ops = ops; 2183 typec_altmode_set_drvdata(alt, drvdata); 2184 altmodes[index] = alt; 2185 index++; 2186 } 2187 } 2188 EXPORT_SYMBOL_GPL(typec_port_register_altmodes); 2189 2190 /** 2191 * typec_register_port - Register a USB Type-C Port 2192 * @parent: Parent device 2193 * @cap: Description of the port 2194 * 2195 * Registers a device for USB Type-C Port described in @cap. 2196 * 2197 * Returns handle to the port on success or ERR_PTR on failure. 2198 */ 2199 struct typec_port *typec_register_port(struct device *parent, 2200 const struct typec_capability *cap) 2201 { 2202 struct typec_port *port; 2203 int ret; 2204 int id; 2205 2206 port = kzalloc(sizeof(*port), GFP_KERNEL); 2207 if (!port) 2208 return ERR_PTR(-ENOMEM); 2209 2210 id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL); 2211 if (id < 0) { 2212 kfree(port); 2213 return ERR_PTR(id); 2214 } 2215 2216 switch (cap->type) { 2217 case TYPEC_PORT_SRC: 2218 port->pwr_role = TYPEC_SOURCE; 2219 port->vconn_role = TYPEC_SOURCE; 2220 break; 2221 case TYPEC_PORT_SNK: 2222 port->pwr_role = TYPEC_SINK; 2223 port->vconn_role = TYPEC_SINK; 2224 break; 2225 case TYPEC_PORT_DRP: 2226 if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE) 2227 port->pwr_role = cap->prefer_role; 2228 else 2229 port->pwr_role = TYPEC_SINK; 2230 break; 2231 } 2232 2233 switch (cap->data) { 2234 case TYPEC_PORT_DFP: 2235 port->data_role = TYPEC_HOST; 2236 break; 2237 case TYPEC_PORT_UFP: 2238 port->data_role = TYPEC_DEVICE; 2239 break; 2240 case TYPEC_PORT_DRD: 2241 if (cap->prefer_role == TYPEC_SOURCE) 2242 port->data_role = TYPEC_HOST; 2243 else 2244 port->data_role = TYPEC_DEVICE; 2245 break; 2246 } 2247 2248 ida_init(&port->mode_ids); 2249 mutex_init(&port->port_type_lock); 2250 2251 port->id = id; 2252 port->ops = cap->ops; 2253 port->port_type = cap->type; 2254 port->prefer_role = cap->prefer_role; 2255 2256 device_initialize(&port->dev); 2257 port->dev.class = &typec_class; 2258 port->dev.parent = parent; 2259 port->dev.fwnode = cap->fwnode; 2260 port->dev.type = &typec_port_dev_type; 2261 dev_set_name(&port->dev, "port%d", id); 2262 dev_set_drvdata(&port->dev, cap->driver_data); 2263 2264 port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL); 2265 if (!port->cap) { 2266 put_device(&port->dev); 2267 return ERR_PTR(-ENOMEM); 2268 } 2269 2270 port->sw = typec_switch_get(&port->dev); 2271 if (IS_ERR(port->sw)) { 2272 ret = PTR_ERR(port->sw); 2273 put_device(&port->dev); 2274 return ERR_PTR(ret); 2275 } 2276 2277 port->mux = typec_mux_get(&port->dev); 2278 if (IS_ERR(port->mux)) { 2279 ret = PTR_ERR(port->mux); 2280 put_device(&port->dev); 2281 return ERR_PTR(ret); 2282 } 2283 2284 port->retimer = typec_retimer_get(&port->dev); 2285 if (IS_ERR(port->retimer)) { 2286 ret = PTR_ERR(port->retimer); 2287 put_device(&port->dev); 2288 return ERR_PTR(ret); 2289 } 2290 2291 ret = device_add(&port->dev); 2292 if (ret) { 2293 dev_err(parent, "failed to register port (%d)\n", ret); 2294 put_device(&port->dev); 2295 return ERR_PTR(ret); 2296 } 2297 2298 ret = typec_port_set_usb_power_delivery(port, cap->pd); 2299 if (ret) { 2300 dev_err(&port->dev, "failed to link pd\n"); 2301 device_unregister(&port->dev); 2302 return ERR_PTR(ret); 2303 } 2304 2305 ret = typec_link_ports(port); 2306 if (ret) 2307 dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret); 2308 2309 return port; 2310 } 2311 EXPORT_SYMBOL_GPL(typec_register_port); 2312 2313 /** 2314 * typec_unregister_port - Unregister a USB Type-C Port 2315 * @port: The port to be unregistered 2316 * 2317 * Unregister device created with typec_register_port(). 2318 */ 2319 void typec_unregister_port(struct typec_port *port) 2320 { 2321 if (!IS_ERR_OR_NULL(port)) { 2322 typec_unlink_ports(port); 2323 typec_port_set_usb_power_delivery(port, NULL); 2324 device_unregister(&port->dev); 2325 } 2326 } 2327 EXPORT_SYMBOL_GPL(typec_unregister_port); 2328 2329 static int __init typec_init(void) 2330 { 2331 int ret; 2332 2333 ret = bus_register(&typec_bus); 2334 if (ret) 2335 return ret; 2336 2337 ret = class_register(&typec_mux_class); 2338 if (ret) 2339 goto err_unregister_bus; 2340 2341 ret = class_register(&retimer_class); 2342 if (ret) 2343 goto err_unregister_mux_class; 2344 2345 ret = class_register(&typec_class); 2346 if (ret) 2347 goto err_unregister_retimer_class; 2348 2349 ret = usb_power_delivery_init(); 2350 if (ret) 2351 goto err_unregister_class; 2352 2353 return 0; 2354 2355 err_unregister_class: 2356 class_unregister(&typec_class); 2357 2358 err_unregister_retimer_class: 2359 class_unregister(&retimer_class); 2360 2361 err_unregister_mux_class: 2362 class_unregister(&typec_mux_class); 2363 2364 err_unregister_bus: 2365 bus_unregister(&typec_bus); 2366 2367 return ret; 2368 } 2369 subsys_initcall(typec_init); 2370 2371 static void __exit typec_exit(void) 2372 { 2373 usb_power_delivery_exit(); 2374 class_unregister(&typec_class); 2375 ida_destroy(&typec_index_ida); 2376 bus_unregister(&typec_bus); 2377 class_unregister(&typec_mux_class); 2378 class_unregister(&retimer_class); 2379 } 2380 module_exit(typec_exit); 2381 2382 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); 2383 MODULE_LICENSE("GPL v2"); 2384 MODULE_DESCRIPTION("USB Type-C Connector Class"); 2385