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 .owner = THIS_MODULE, 26 }; 27 28 /* ------------------------------------------------------------------------- */ 29 /* Common attributes */ 30 31 static 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 */ 38 static 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 46 static 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 53 static 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 60 static 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 74 static 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 } 99 100 static 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 } 107 static DEVICE_ATTR_RO(id_header); 108 109 static 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 } 116 static DEVICE_ATTR_RO(cert_stat); 117 118 static 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 } 125 static DEVICE_ATTR_RO(product); 126 127 static 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 } 134 static DEVICE_ATTR_RO(product_type_vdo1); 135 136 static 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 } 143 static DEVICE_ATTR_RO(product_type_vdo2); 144 145 static 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 } 152 static DEVICE_ATTR_RO(product_type_vdo3); 153 154 static 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 }; 163 164 static const struct attribute_group usb_pd_id_group = { 165 .name = "identity", 166 .attrs = usb_pd_id_attrs, 167 }; 168 169 static const struct attribute_group *usb_pd_id_groups[] = { 170 &usb_pd_id_group, 171 NULL, 172 }; 173 174 static 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 } 192 193 static 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 } 203 204 static ssize_t 205 type_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 } 215 static DEVICE_ATTR_RO(type); 216 217 static ssize_t usb_power_delivery_revision_show(struct device *dev, 218 struct device_attribute *attr, 219 char *buf); 220 static DEVICE_ATTR_RO(usb_power_delivery_revision); 221 222 /* ------------------------------------------------------------------------- */ 223 /* Alternate Modes */ 224 225 static 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 } 235 236 static 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 } 261 262 static 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 */ 290 void 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 } 310 EXPORT_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 */ 319 struct 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 } 330 EXPORT_SYMBOL_GPL(typec_altmode2port); 331 332 static ssize_t 333 vdo_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 } 339 static DEVICE_ATTR_RO(vdo); 340 341 static ssize_t 342 description_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 } 348 static DEVICE_ATTR_RO(description); 349 350 static ssize_t 351 active_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 } 357 358 static 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 } 395 static DEVICE_ATTR_RW(active); 396 397 static ssize_t 398 supported_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 } 418 static DEVICE_ATTR_RO(supported_roles); 419 420 static ssize_t 421 mode_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 } 427 static DEVICE_ATTR_RO(mode); 428 429 static ssize_t 430 svid_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 } 436 static DEVICE_ATTR_RO(svid); 437 438 static 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 }; 445 446 static 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 } 457 458 static const struct attribute_group typec_altmode_group = { 459 .is_visible = typec_altmode_attr_is_visible, 460 .attrs = typec_altmode_attrs, 461 }; 462 463 static const struct attribute_group *typec_altmode_groups[] = { 464 &typec_altmode_group, 465 NULL 466 }; 467 468 static 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 } 481 482 static 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 } 495 496 static 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 } 505 506 const struct device_type typec_altmode_dev_type = { 507 .name = "typec_alternate_mode", 508 .groups = typec_altmode_groups, 509 .release = typec_altmode_release, 510 }; 511 512 static struct typec_altmode * 513 typec_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 */ 582 void 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 } 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_register_partner - Register a USB Type-C Partner 826 * @port: The USB Type-C Port the partner is connected to 827 * @desc: Description of the partner 828 * 829 * Registers a device for USB Type-C Partner described in @desc. 830 * 831 * Returns handle to the partner on success or ERR_PTR on failure. 832 */ 833 struct typec_partner *typec_register_partner(struct typec_port *port, 834 struct typec_partner_desc *desc) 835 { 836 struct typec_partner *partner; 837 int ret; 838 839 partner = kzalloc(sizeof(*partner), GFP_KERNEL); 840 if (!partner) 841 return ERR_PTR(-ENOMEM); 842 843 ida_init(&partner->mode_ids); 844 partner->usb_pd = desc->usb_pd; 845 partner->accessory = desc->accessory; 846 partner->num_altmodes = -1; 847 partner->pd_revision = desc->pd_revision; 848 partner->svdm_version = port->cap->svdm_version; 849 850 if (desc->identity) { 851 /* 852 * Creating directory for the identity only if the driver is 853 * able to provide data to it. 854 */ 855 partner->dev.groups = usb_pd_id_groups; 856 partner->identity = desc->identity; 857 } 858 859 partner->dev.class = &typec_class; 860 partner->dev.parent = &port->dev; 861 partner->dev.type = &typec_partner_dev_type; 862 dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev)); 863 864 ret = device_register(&partner->dev); 865 if (ret) { 866 dev_err(&port->dev, "failed to register partner (%d)\n", ret); 867 put_device(&partner->dev); 868 return ERR_PTR(ret); 869 } 870 871 return partner; 872 } 873 EXPORT_SYMBOL_GPL(typec_register_partner); 874 875 /** 876 * typec_unregister_partner - Unregister a USB Type-C Partner 877 * @partner: The partner to be unregistered 878 * 879 * Unregister device created with typec_register_partner(). 880 */ 881 void typec_unregister_partner(struct typec_partner *partner) 882 { 883 if (!IS_ERR_OR_NULL(partner)) 884 device_unregister(&partner->dev); 885 } 886 EXPORT_SYMBOL_GPL(typec_unregister_partner); 887 888 /* ------------------------------------------------------------------------- */ 889 /* Type-C Cable Plugs */ 890 891 static void typec_plug_release(struct device *dev) 892 { 893 struct typec_plug *plug = to_typec_plug(dev); 894 895 ida_destroy(&plug->mode_ids); 896 kfree(plug); 897 } 898 899 static struct attribute *typec_plug_attrs[] = { 900 &dev_attr_number_of_alternate_modes.attr, 901 NULL 902 }; 903 904 static umode_t typec_plug_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) 905 { 906 struct typec_plug *plug = to_typec_plug(kobj_to_dev(kobj)); 907 908 if (attr == &dev_attr_number_of_alternate_modes.attr) { 909 if (plug->num_altmodes < 0) 910 return 0; 911 } 912 913 return attr->mode; 914 } 915 916 static const struct attribute_group typec_plug_group = { 917 .is_visible = typec_plug_attr_is_visible, 918 .attrs = typec_plug_attrs 919 }; 920 921 static const struct attribute_group *typec_plug_groups[] = { 922 &typec_plug_group, 923 NULL 924 }; 925 926 const struct device_type typec_plug_dev_type = { 927 .name = "typec_plug", 928 .groups = typec_plug_groups, 929 .release = typec_plug_release, 930 }; 931 932 /** 933 * typec_plug_set_num_altmodes - Set the number of available plug altmodes 934 * @plug: The plug to be updated. 935 * @num_altmodes: The number of altmodes we want to specify as available. 936 * 937 * This routine is used to report the number of alternate modes supported by the 938 * plug. This value is *not* enforced in alternate mode registration routines. 939 * 940 * @plug.num_altmodes is set to -1 on plug registration, denoting that 941 * a valid value has not been set for it yet. 942 * 943 * Returns 0 on success or negative error number on failure. 944 */ 945 int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes) 946 { 947 int ret; 948 949 if (num_altmodes < 0) 950 return -EINVAL; 951 952 plug->num_altmodes = num_altmodes; 953 ret = sysfs_update_group(&plug->dev.kobj, &typec_plug_group); 954 if (ret < 0) 955 return ret; 956 957 sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes"); 958 kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE); 959 960 return 0; 961 } 962 EXPORT_SYMBOL_GPL(typec_plug_set_num_altmodes); 963 964 /** 965 * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode 966 * @plug: USB Type-C Cable Plug that supports the alternate mode 967 * @desc: Description of the alternate mode 968 * 969 * This routine is used to register each alternate mode individually that @plug 970 * has listed in response to Discover SVIDs command. The modes for a SVID that 971 * the plug lists in response to Discover Modes command need to be listed in an 972 * array in @desc. 973 * 974 * Returns handle to the alternate mode on success or ERR_PTR on failure. 975 */ 976 struct typec_altmode * 977 typec_plug_register_altmode(struct typec_plug *plug, 978 const struct typec_altmode_desc *desc) 979 { 980 return typec_register_altmode(&plug->dev, desc); 981 } 982 EXPORT_SYMBOL_GPL(typec_plug_register_altmode); 983 984 /** 985 * typec_register_plug - Register a USB Type-C Cable Plug 986 * @cable: USB Type-C Cable with the plug 987 * @desc: Description of the cable plug 988 * 989 * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C 990 * Cable Plug represents a plug with electronics in it that can response to USB 991 * Power Delivery SOP Prime or SOP Double Prime packages. 992 * 993 * Returns handle to the cable plug on success or ERR_PTR on failure. 994 */ 995 struct typec_plug *typec_register_plug(struct typec_cable *cable, 996 struct typec_plug_desc *desc) 997 { 998 struct typec_plug *plug; 999 char name[8]; 1000 int ret; 1001 1002 plug = kzalloc(sizeof(*plug), GFP_KERNEL); 1003 if (!plug) 1004 return ERR_PTR(-ENOMEM); 1005 1006 sprintf(name, "plug%d", desc->index); 1007 1008 ida_init(&plug->mode_ids); 1009 plug->num_altmodes = -1; 1010 plug->index = desc->index; 1011 plug->dev.class = &typec_class; 1012 plug->dev.parent = &cable->dev; 1013 plug->dev.type = &typec_plug_dev_type; 1014 dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name); 1015 1016 ret = device_register(&plug->dev); 1017 if (ret) { 1018 dev_err(&cable->dev, "failed to register plug (%d)\n", ret); 1019 put_device(&plug->dev); 1020 return ERR_PTR(ret); 1021 } 1022 1023 return plug; 1024 } 1025 EXPORT_SYMBOL_GPL(typec_register_plug); 1026 1027 /** 1028 * typec_unregister_plug - Unregister a USB Type-C Cable Plug 1029 * @plug: The cable plug to be unregistered 1030 * 1031 * Unregister device created with typec_register_plug(). 1032 */ 1033 void typec_unregister_plug(struct typec_plug *plug) 1034 { 1035 if (!IS_ERR_OR_NULL(plug)) 1036 device_unregister(&plug->dev); 1037 } 1038 EXPORT_SYMBOL_GPL(typec_unregister_plug); 1039 1040 /* Type-C Cables */ 1041 1042 static const char * const typec_plug_types[] = { 1043 [USB_PLUG_NONE] = "unknown", 1044 [USB_PLUG_TYPE_A] = "type-a", 1045 [USB_PLUG_TYPE_B] = "type-b", 1046 [USB_PLUG_TYPE_C] = "type-c", 1047 [USB_PLUG_CAPTIVE] = "captive", 1048 }; 1049 1050 static ssize_t plug_type_show(struct device *dev, 1051 struct device_attribute *attr, char *buf) 1052 { 1053 struct typec_cable *cable = to_typec_cable(dev); 1054 1055 return sprintf(buf, "%s\n", typec_plug_types[cable->type]); 1056 } 1057 static DEVICE_ATTR_RO(plug_type); 1058 1059 static struct attribute *typec_cable_attrs[] = { 1060 &dev_attr_type.attr, 1061 &dev_attr_plug_type.attr, 1062 &dev_attr_usb_power_delivery_revision.attr, 1063 NULL 1064 }; 1065 ATTRIBUTE_GROUPS(typec_cable); 1066 1067 static void typec_cable_release(struct device *dev) 1068 { 1069 struct typec_cable *cable = to_typec_cable(dev); 1070 1071 kfree(cable); 1072 } 1073 1074 const struct device_type typec_cable_dev_type = { 1075 .name = "typec_cable", 1076 .groups = typec_cable_groups, 1077 .release = typec_cable_release, 1078 }; 1079 1080 static int cable_match(struct device *dev, void *data) 1081 { 1082 return is_typec_cable(dev); 1083 } 1084 1085 /** 1086 * typec_cable_get - Get a reference to the USB Type-C cable 1087 * @port: The USB Type-C Port the cable is connected to 1088 * 1089 * The caller must decrement the reference count with typec_cable_put() after 1090 * use. 1091 */ 1092 struct typec_cable *typec_cable_get(struct typec_port *port) 1093 { 1094 struct device *dev; 1095 1096 dev = device_find_child(&port->dev, NULL, cable_match); 1097 if (!dev) 1098 return NULL; 1099 1100 return to_typec_cable(dev); 1101 } 1102 EXPORT_SYMBOL_GPL(typec_cable_get); 1103 1104 /** 1105 * typec_cable_put - Decrement the reference count on USB Type-C cable 1106 * @cable: The USB Type-C cable 1107 */ 1108 void typec_cable_put(struct typec_cable *cable) 1109 { 1110 put_device(&cable->dev); 1111 } 1112 EXPORT_SYMBOL_GPL(typec_cable_put); 1113 1114 /** 1115 * typec_cable_is_active - Check is the USB Type-C cable active or passive 1116 * @cable: The USB Type-C Cable 1117 * 1118 * Return 1 if the cable is active or 0 if it's passive. 1119 */ 1120 int typec_cable_is_active(struct typec_cable *cable) 1121 { 1122 return cable->active; 1123 } 1124 EXPORT_SYMBOL_GPL(typec_cable_is_active); 1125 1126 /** 1127 * typec_cable_set_identity - Report result from Discover Identity command 1128 * @cable: The cable updated identity values 1129 * 1130 * This routine is used to report that the result of Discover Identity USB power 1131 * delivery command has become available. 1132 */ 1133 int typec_cable_set_identity(struct typec_cable *cable) 1134 { 1135 if (!cable->identity) 1136 return -EINVAL; 1137 1138 typec_report_identity(&cable->dev); 1139 return 0; 1140 } 1141 EXPORT_SYMBOL_GPL(typec_cable_set_identity); 1142 1143 /** 1144 * typec_register_cable - Register a USB Type-C Cable 1145 * @port: The USB Type-C Port the cable is connected to 1146 * @desc: Description of the cable 1147 * 1148 * Registers a device for USB Type-C Cable described in @desc. The cable will be 1149 * parent for the optional cable plug devises. 1150 * 1151 * Returns handle to the cable on success or ERR_PTR on failure. 1152 */ 1153 struct typec_cable *typec_register_cable(struct typec_port *port, 1154 struct typec_cable_desc *desc) 1155 { 1156 struct typec_cable *cable; 1157 int ret; 1158 1159 cable = kzalloc(sizeof(*cable), GFP_KERNEL); 1160 if (!cable) 1161 return ERR_PTR(-ENOMEM); 1162 1163 cable->type = desc->type; 1164 cable->active = desc->active; 1165 cable->pd_revision = desc->pd_revision; 1166 1167 if (desc->identity) { 1168 /* 1169 * Creating directory for the identity only if the driver is 1170 * able to provide data to it. 1171 */ 1172 cable->dev.groups = usb_pd_id_groups; 1173 cable->identity = desc->identity; 1174 } 1175 1176 cable->dev.class = &typec_class; 1177 cable->dev.parent = &port->dev; 1178 cable->dev.type = &typec_cable_dev_type; 1179 dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev)); 1180 1181 ret = device_register(&cable->dev); 1182 if (ret) { 1183 dev_err(&port->dev, "failed to register cable (%d)\n", ret); 1184 put_device(&cable->dev); 1185 return ERR_PTR(ret); 1186 } 1187 1188 return cable; 1189 } 1190 EXPORT_SYMBOL_GPL(typec_register_cable); 1191 1192 /** 1193 * typec_unregister_cable - Unregister a USB Type-C Cable 1194 * @cable: The cable to be unregistered 1195 * 1196 * Unregister device created with typec_register_cable(). 1197 */ 1198 void typec_unregister_cable(struct typec_cable *cable) 1199 { 1200 if (!IS_ERR_OR_NULL(cable)) 1201 device_unregister(&cable->dev); 1202 } 1203 EXPORT_SYMBOL_GPL(typec_unregister_cable); 1204 1205 /* ------------------------------------------------------------------------- */ 1206 /* USB Type-C ports */ 1207 1208 /** 1209 * typec_port_set_usb_power_delivery - Assign USB PD for port. 1210 * @port: USB Type-C port. 1211 * @pd: USB PD instance. 1212 * 1213 * This routine can be used to set the USB Power Delivery Capabilities for @port 1214 * that it will advertise to the partner. 1215 * 1216 * If @pd is NULL, the assignment is removed. 1217 */ 1218 int typec_port_set_usb_power_delivery(struct typec_port *port, struct usb_power_delivery *pd) 1219 { 1220 int ret; 1221 1222 if (IS_ERR_OR_NULL(port) || port->pd == pd) 1223 return 0; 1224 1225 if (pd) { 1226 ret = usb_power_delivery_link_device(pd, &port->dev); 1227 if (ret) 1228 return ret; 1229 } else { 1230 usb_power_delivery_unlink_device(port->pd, &port->dev); 1231 } 1232 1233 port->pd = pd; 1234 1235 return 0; 1236 } 1237 EXPORT_SYMBOL_GPL(typec_port_set_usb_power_delivery); 1238 1239 static ssize_t select_usb_power_delivery_store(struct device *dev, 1240 struct device_attribute *attr, 1241 const char *buf, size_t size) 1242 { 1243 struct typec_port *port = to_typec_port(dev); 1244 struct usb_power_delivery *pd; 1245 1246 if (!port->ops || !port->ops->pd_set) 1247 return -EOPNOTSUPP; 1248 1249 pd = usb_power_delivery_find(buf); 1250 if (!pd) 1251 return -EINVAL; 1252 1253 return port->ops->pd_set(port, pd); 1254 } 1255 1256 static ssize_t select_usb_power_delivery_show(struct device *dev, 1257 struct device_attribute *attr, char *buf) 1258 { 1259 struct typec_port *port = to_typec_port(dev); 1260 struct usb_power_delivery **pds; 1261 struct usb_power_delivery *pd; 1262 int ret = 0; 1263 1264 if (!port->ops || !port->ops->pd_get) 1265 return -EOPNOTSUPP; 1266 1267 pds = port->ops->pd_get(port); 1268 if (!pds) 1269 return 0; 1270 1271 for (pd = pds[0]; pd; pd++) { 1272 if (pd == port->pd) 1273 ret += sysfs_emit(buf + ret, "[%s] ", dev_name(&pd->dev)); 1274 else 1275 ret += sysfs_emit(buf + ret, "%s ", dev_name(&pd->dev)); 1276 } 1277 1278 buf[ret - 1] = '\n'; 1279 1280 return ret; 1281 } 1282 static DEVICE_ATTR_RW(select_usb_power_delivery); 1283 1284 static struct attribute *port_attrs[] = { 1285 &dev_attr_select_usb_power_delivery.attr, 1286 NULL 1287 }; 1288 1289 static umode_t port_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) 1290 { 1291 struct typec_port *port = to_typec_port(kobj_to_dev(kobj)); 1292 1293 if (!port->pd || !port->ops || !port->ops->pd_get) 1294 return 0; 1295 if (!port->ops->pd_set) 1296 return 0444; 1297 1298 return attr->mode; 1299 } 1300 1301 static const struct attribute_group pd_group = { 1302 .is_visible = port_attr_is_visible, 1303 .attrs = port_attrs, 1304 }; 1305 1306 static const char * const typec_orientations[] = { 1307 [TYPEC_ORIENTATION_NONE] = "unknown", 1308 [TYPEC_ORIENTATION_NORMAL] = "normal", 1309 [TYPEC_ORIENTATION_REVERSE] = "reverse", 1310 }; 1311 1312 static const char * const typec_roles[] = { 1313 [TYPEC_SINK] = "sink", 1314 [TYPEC_SOURCE] = "source", 1315 }; 1316 1317 static const char * const typec_data_roles[] = { 1318 [TYPEC_DEVICE] = "device", 1319 [TYPEC_HOST] = "host", 1320 }; 1321 1322 static const char * const typec_port_power_roles[] = { 1323 [TYPEC_PORT_SRC] = "source", 1324 [TYPEC_PORT_SNK] = "sink", 1325 [TYPEC_PORT_DRP] = "dual", 1326 }; 1327 1328 static const char * const typec_port_data_roles[] = { 1329 [TYPEC_PORT_DFP] = "host", 1330 [TYPEC_PORT_UFP] = "device", 1331 [TYPEC_PORT_DRD] = "dual", 1332 }; 1333 1334 static const char * const typec_port_types_drp[] = { 1335 [TYPEC_PORT_SRC] = "dual [source] sink", 1336 [TYPEC_PORT_SNK] = "dual source [sink]", 1337 [TYPEC_PORT_DRP] = "[dual] source sink", 1338 }; 1339 1340 static ssize_t 1341 preferred_role_store(struct device *dev, struct device_attribute *attr, 1342 const char *buf, size_t size) 1343 { 1344 struct typec_port *port = to_typec_port(dev); 1345 int role; 1346 int ret; 1347 1348 if (port->cap->type != TYPEC_PORT_DRP) { 1349 dev_dbg(dev, "Preferred role only supported with DRP ports\n"); 1350 return -EOPNOTSUPP; 1351 } 1352 1353 if (!port->ops || !port->ops->try_role) { 1354 dev_dbg(dev, "Setting preferred role not supported\n"); 1355 return -EOPNOTSUPP; 1356 } 1357 1358 role = sysfs_match_string(typec_roles, buf); 1359 if (role < 0) { 1360 if (sysfs_streq(buf, "none")) 1361 role = TYPEC_NO_PREFERRED_ROLE; 1362 else 1363 return -EINVAL; 1364 } 1365 1366 ret = port->ops->try_role(port, role); 1367 if (ret) 1368 return ret; 1369 1370 port->prefer_role = role; 1371 return size; 1372 } 1373 1374 static ssize_t 1375 preferred_role_show(struct device *dev, struct device_attribute *attr, 1376 char *buf) 1377 { 1378 struct typec_port *port = to_typec_port(dev); 1379 1380 if (port->cap->type != TYPEC_PORT_DRP) 1381 return 0; 1382 1383 if (port->prefer_role < 0) 1384 return 0; 1385 1386 return sprintf(buf, "%s\n", typec_roles[port->prefer_role]); 1387 } 1388 static DEVICE_ATTR_RW(preferred_role); 1389 1390 static ssize_t data_role_store(struct device *dev, 1391 struct device_attribute *attr, 1392 const char *buf, size_t size) 1393 { 1394 struct typec_port *port = to_typec_port(dev); 1395 int ret; 1396 1397 if (!port->ops || !port->ops->dr_set) { 1398 dev_dbg(dev, "data role swapping not supported\n"); 1399 return -EOPNOTSUPP; 1400 } 1401 1402 ret = sysfs_match_string(typec_data_roles, buf); 1403 if (ret < 0) 1404 return ret; 1405 1406 mutex_lock(&port->port_type_lock); 1407 if (port->cap->data != TYPEC_PORT_DRD) { 1408 ret = -EOPNOTSUPP; 1409 goto unlock_and_ret; 1410 } 1411 1412 ret = port->ops->dr_set(port, ret); 1413 if (ret) 1414 goto unlock_and_ret; 1415 1416 ret = size; 1417 unlock_and_ret: 1418 mutex_unlock(&port->port_type_lock); 1419 return ret; 1420 } 1421 1422 static ssize_t data_role_show(struct device *dev, 1423 struct device_attribute *attr, char *buf) 1424 { 1425 struct typec_port *port = to_typec_port(dev); 1426 1427 if (port->cap->data == TYPEC_PORT_DRD) 1428 return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ? 1429 "[host] device" : "host [device]"); 1430 1431 return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]); 1432 } 1433 static DEVICE_ATTR_RW(data_role); 1434 1435 static ssize_t power_role_store(struct device *dev, 1436 struct device_attribute *attr, 1437 const char *buf, size_t size) 1438 { 1439 struct typec_port *port = to_typec_port(dev); 1440 int ret; 1441 1442 if (!port->ops || !port->ops->pr_set) { 1443 dev_dbg(dev, "power role swapping not supported\n"); 1444 return -EOPNOTSUPP; 1445 } 1446 1447 if (port->pwr_opmode != TYPEC_PWR_MODE_PD) { 1448 dev_dbg(dev, "partner unable to swap power role\n"); 1449 return -EIO; 1450 } 1451 1452 ret = sysfs_match_string(typec_roles, buf); 1453 if (ret < 0) 1454 return ret; 1455 1456 mutex_lock(&port->port_type_lock); 1457 if (port->port_type != TYPEC_PORT_DRP) { 1458 dev_dbg(dev, "port type fixed at \"%s\"", 1459 typec_port_power_roles[port->port_type]); 1460 ret = -EOPNOTSUPP; 1461 goto unlock_and_ret; 1462 } 1463 1464 ret = port->ops->pr_set(port, ret); 1465 if (ret) 1466 goto unlock_and_ret; 1467 1468 ret = size; 1469 unlock_and_ret: 1470 mutex_unlock(&port->port_type_lock); 1471 return ret; 1472 } 1473 1474 static ssize_t power_role_show(struct device *dev, 1475 struct device_attribute *attr, char *buf) 1476 { 1477 struct typec_port *port = to_typec_port(dev); 1478 1479 if (port->cap->type == TYPEC_PORT_DRP) 1480 return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ? 1481 "[source] sink" : "source [sink]"); 1482 1483 return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]); 1484 } 1485 static DEVICE_ATTR_RW(power_role); 1486 1487 static ssize_t 1488 port_type_store(struct device *dev, struct device_attribute *attr, 1489 const char *buf, size_t size) 1490 { 1491 struct typec_port *port = to_typec_port(dev); 1492 int ret; 1493 enum typec_port_type type; 1494 1495 if (port->cap->type != TYPEC_PORT_DRP || 1496 !port->ops || !port->ops->port_type_set) { 1497 dev_dbg(dev, "changing port type not supported\n"); 1498 return -EOPNOTSUPP; 1499 } 1500 1501 ret = sysfs_match_string(typec_port_power_roles, buf); 1502 if (ret < 0) 1503 return ret; 1504 1505 type = ret; 1506 mutex_lock(&port->port_type_lock); 1507 1508 if (port->port_type == type) { 1509 ret = size; 1510 goto unlock_and_ret; 1511 } 1512 1513 ret = port->ops->port_type_set(port, type); 1514 if (ret) 1515 goto unlock_and_ret; 1516 1517 port->port_type = type; 1518 ret = size; 1519 1520 unlock_and_ret: 1521 mutex_unlock(&port->port_type_lock); 1522 return ret; 1523 } 1524 1525 static ssize_t 1526 port_type_show(struct device *dev, struct device_attribute *attr, 1527 char *buf) 1528 { 1529 struct typec_port *port = to_typec_port(dev); 1530 1531 if (port->cap->type == TYPEC_PORT_DRP) 1532 return sprintf(buf, "%s\n", 1533 typec_port_types_drp[port->port_type]); 1534 1535 return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]); 1536 } 1537 static DEVICE_ATTR_RW(port_type); 1538 1539 static const char * const typec_pwr_opmodes[] = { 1540 [TYPEC_PWR_MODE_USB] = "default", 1541 [TYPEC_PWR_MODE_1_5A] = "1.5A", 1542 [TYPEC_PWR_MODE_3_0A] = "3.0A", 1543 [TYPEC_PWR_MODE_PD] = "usb_power_delivery", 1544 }; 1545 1546 static ssize_t power_operation_mode_show(struct device *dev, 1547 struct device_attribute *attr, 1548 char *buf) 1549 { 1550 struct typec_port *port = to_typec_port(dev); 1551 1552 return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]); 1553 } 1554 static DEVICE_ATTR_RO(power_operation_mode); 1555 1556 static ssize_t vconn_source_store(struct device *dev, 1557 struct device_attribute *attr, 1558 const char *buf, size_t size) 1559 { 1560 struct typec_port *port = to_typec_port(dev); 1561 bool source; 1562 int ret; 1563 1564 if (!port->cap->pd_revision) { 1565 dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n"); 1566 return -EOPNOTSUPP; 1567 } 1568 1569 if (!port->ops || !port->ops->vconn_set) { 1570 dev_dbg(dev, "VCONN swapping not supported\n"); 1571 return -EOPNOTSUPP; 1572 } 1573 1574 ret = kstrtobool(buf, &source); 1575 if (ret) 1576 return ret; 1577 1578 ret = port->ops->vconn_set(port, (enum typec_role)source); 1579 if (ret) 1580 return ret; 1581 1582 return size; 1583 } 1584 1585 static ssize_t vconn_source_show(struct device *dev, 1586 struct device_attribute *attr, char *buf) 1587 { 1588 struct typec_port *port = to_typec_port(dev); 1589 1590 return sprintf(buf, "%s\n", 1591 port->vconn_role == TYPEC_SOURCE ? "yes" : "no"); 1592 } 1593 static DEVICE_ATTR_RW(vconn_source); 1594 1595 static ssize_t supported_accessory_modes_show(struct device *dev, 1596 struct device_attribute *attr, 1597 char *buf) 1598 { 1599 struct typec_port *port = to_typec_port(dev); 1600 ssize_t ret = 0; 1601 int i; 1602 1603 for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) { 1604 if (port->cap->accessory[i]) 1605 ret += sprintf(buf + ret, "%s ", 1606 typec_accessory_modes[port->cap->accessory[i]]); 1607 } 1608 1609 if (!ret) 1610 return sprintf(buf, "none\n"); 1611 1612 buf[ret - 1] = '\n'; 1613 1614 return ret; 1615 } 1616 static DEVICE_ATTR_RO(supported_accessory_modes); 1617 1618 static ssize_t usb_typec_revision_show(struct device *dev, 1619 struct device_attribute *attr, 1620 char *buf) 1621 { 1622 struct typec_port *port = to_typec_port(dev); 1623 u16 rev = port->cap->revision; 1624 1625 return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf); 1626 } 1627 static DEVICE_ATTR_RO(usb_typec_revision); 1628 1629 static ssize_t usb_power_delivery_revision_show(struct device *dev, 1630 struct device_attribute *attr, 1631 char *buf) 1632 { 1633 u16 rev = 0; 1634 1635 if (is_typec_partner(dev)) { 1636 struct typec_partner *partner = to_typec_partner(dev); 1637 1638 rev = partner->pd_revision; 1639 } else if (is_typec_cable(dev)) { 1640 struct typec_cable *cable = to_typec_cable(dev); 1641 1642 rev = cable->pd_revision; 1643 } else if (is_typec_port(dev)) { 1644 struct typec_port *p = to_typec_port(dev); 1645 1646 rev = p->cap->pd_revision; 1647 } 1648 return sysfs_emit(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf); 1649 } 1650 1651 static ssize_t orientation_show(struct device *dev, 1652 struct device_attribute *attr, 1653 char *buf) 1654 { 1655 struct typec_port *port = to_typec_port(dev); 1656 1657 return sprintf(buf, "%s\n", typec_orientations[port->orientation]); 1658 } 1659 static DEVICE_ATTR_RO(orientation); 1660 1661 static struct attribute *typec_attrs[] = { 1662 &dev_attr_data_role.attr, 1663 &dev_attr_power_operation_mode.attr, 1664 &dev_attr_power_role.attr, 1665 &dev_attr_preferred_role.attr, 1666 &dev_attr_supported_accessory_modes.attr, 1667 &dev_attr_usb_power_delivery_revision.attr, 1668 &dev_attr_usb_typec_revision.attr, 1669 &dev_attr_vconn_source.attr, 1670 &dev_attr_port_type.attr, 1671 &dev_attr_orientation.attr, 1672 NULL, 1673 }; 1674 1675 static umode_t typec_attr_is_visible(struct kobject *kobj, 1676 struct attribute *attr, int n) 1677 { 1678 struct typec_port *port = to_typec_port(kobj_to_dev(kobj)); 1679 1680 if (attr == &dev_attr_data_role.attr) { 1681 if (port->cap->data != TYPEC_PORT_DRD || 1682 !port->ops || !port->ops->dr_set) 1683 return 0444; 1684 } else if (attr == &dev_attr_power_role.attr) { 1685 if (port->cap->type != TYPEC_PORT_DRP || 1686 !port->ops || !port->ops->pr_set) 1687 return 0444; 1688 } else if (attr == &dev_attr_vconn_source.attr) { 1689 if (!port->cap->pd_revision || 1690 !port->ops || !port->ops->vconn_set) 1691 return 0444; 1692 } else if (attr == &dev_attr_preferred_role.attr) { 1693 if (port->cap->type != TYPEC_PORT_DRP || 1694 !port->ops || !port->ops->try_role) 1695 return 0444; 1696 } else if (attr == &dev_attr_port_type.attr) { 1697 if (!port->ops || !port->ops->port_type_set) 1698 return 0; 1699 if (port->cap->type != TYPEC_PORT_DRP) 1700 return 0444; 1701 } else if (attr == &dev_attr_orientation.attr) { 1702 if (port->cap->orientation_aware) 1703 return 0444; 1704 return 0; 1705 } 1706 1707 return attr->mode; 1708 } 1709 1710 static const struct attribute_group typec_group = { 1711 .is_visible = typec_attr_is_visible, 1712 .attrs = typec_attrs, 1713 }; 1714 1715 static const struct attribute_group *typec_groups[] = { 1716 &typec_group, 1717 &pd_group, 1718 NULL 1719 }; 1720 1721 static int typec_uevent(struct device *dev, struct kobj_uevent_env *env) 1722 { 1723 int ret; 1724 1725 ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev)); 1726 if (ret) 1727 dev_err(dev, "failed to add uevent TYPEC_PORT\n"); 1728 1729 return ret; 1730 } 1731 1732 static void typec_release(struct device *dev) 1733 { 1734 struct typec_port *port = to_typec_port(dev); 1735 1736 ida_simple_remove(&typec_index_ida, port->id); 1737 ida_destroy(&port->mode_ids); 1738 typec_switch_put(port->sw); 1739 typec_mux_put(port->mux); 1740 typec_retimer_put(port->retimer); 1741 kfree(port->cap); 1742 kfree(port); 1743 } 1744 1745 const struct device_type typec_port_dev_type = { 1746 .name = "typec_port", 1747 .groups = typec_groups, 1748 .uevent = typec_uevent, 1749 .release = typec_release, 1750 }; 1751 1752 /* --------------------------------------- */ 1753 /* Driver callbacks to report role updates */ 1754 1755 static int partner_match(struct device *dev, void *data) 1756 { 1757 return is_typec_partner(dev); 1758 } 1759 1760 /** 1761 * typec_set_data_role - Report data role change 1762 * @port: The USB Type-C Port where the role was changed 1763 * @role: The new data role 1764 * 1765 * This routine is used by the port drivers to report data role changes. 1766 */ 1767 void typec_set_data_role(struct typec_port *port, enum typec_data_role role) 1768 { 1769 struct device *partner_dev; 1770 1771 if (port->data_role == role) 1772 return; 1773 1774 port->data_role = role; 1775 sysfs_notify(&port->dev.kobj, NULL, "data_role"); 1776 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1777 1778 partner_dev = device_find_child(&port->dev, NULL, partner_match); 1779 if (!partner_dev) 1780 return; 1781 1782 if (to_typec_partner(partner_dev)->identity) 1783 typec_product_type_notify(partner_dev); 1784 1785 put_device(partner_dev); 1786 } 1787 EXPORT_SYMBOL_GPL(typec_set_data_role); 1788 1789 /** 1790 * typec_set_pwr_role - Report power role change 1791 * @port: The USB Type-C Port where the role was changed 1792 * @role: The new data role 1793 * 1794 * This routine is used by the port drivers to report power role changes. 1795 */ 1796 void typec_set_pwr_role(struct typec_port *port, enum typec_role role) 1797 { 1798 if (port->pwr_role == role) 1799 return; 1800 1801 port->pwr_role = role; 1802 sysfs_notify(&port->dev.kobj, NULL, "power_role"); 1803 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1804 } 1805 EXPORT_SYMBOL_GPL(typec_set_pwr_role); 1806 1807 /** 1808 * typec_set_vconn_role - Report VCONN source change 1809 * @port: The USB Type-C Port which VCONN role changed 1810 * @role: Source when @port is sourcing VCONN, or Sink when it's not 1811 * 1812 * This routine is used by the port drivers to report if the VCONN source is 1813 * changes. 1814 */ 1815 void typec_set_vconn_role(struct typec_port *port, enum typec_role role) 1816 { 1817 if (port->vconn_role == role) 1818 return; 1819 1820 port->vconn_role = role; 1821 sysfs_notify(&port->dev.kobj, NULL, "vconn_source"); 1822 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1823 } 1824 EXPORT_SYMBOL_GPL(typec_set_vconn_role); 1825 1826 /** 1827 * typec_set_pwr_opmode - Report changed power operation mode 1828 * @port: The USB Type-C Port where the mode was changed 1829 * @opmode: New power operation mode 1830 * 1831 * This routine is used by the port drivers to report changed power operation 1832 * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB 1833 * Type-C specification, and "USB Power Delivery" when the power levels are 1834 * negotiated with methods defined in USB Power Delivery specification. 1835 */ 1836 void typec_set_pwr_opmode(struct typec_port *port, 1837 enum typec_pwr_opmode opmode) 1838 { 1839 struct device *partner_dev; 1840 1841 if (port->pwr_opmode == opmode) 1842 return; 1843 1844 port->pwr_opmode = opmode; 1845 sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode"); 1846 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1847 1848 partner_dev = device_find_child(&port->dev, NULL, partner_match); 1849 if (partner_dev) { 1850 struct typec_partner *partner = to_typec_partner(partner_dev); 1851 1852 if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) { 1853 partner->usb_pd = 1; 1854 sysfs_notify(&partner_dev->kobj, NULL, 1855 "supports_usb_power_delivery"); 1856 kobject_uevent(&partner_dev->kobj, KOBJ_CHANGE); 1857 } 1858 put_device(partner_dev); 1859 } 1860 } 1861 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode); 1862 1863 /** 1864 * typec_find_pwr_opmode - Get the typec power operation mode capability 1865 * @name: power operation mode string 1866 * 1867 * This routine is used to find the typec_pwr_opmode by its string @name. 1868 * 1869 * Returns typec_pwr_opmode if success, otherwise negative error code. 1870 */ 1871 int typec_find_pwr_opmode(const char *name) 1872 { 1873 return match_string(typec_pwr_opmodes, 1874 ARRAY_SIZE(typec_pwr_opmodes), name); 1875 } 1876 EXPORT_SYMBOL_GPL(typec_find_pwr_opmode); 1877 1878 /** 1879 * typec_find_orientation - Convert orientation string to enum typec_orientation 1880 * @name: Orientation string 1881 * 1882 * This routine is used to find the typec_orientation by its string name @name. 1883 * 1884 * Returns the orientation value on success, otherwise negative error code. 1885 */ 1886 int typec_find_orientation(const char *name) 1887 { 1888 return match_string(typec_orientations, ARRAY_SIZE(typec_orientations), 1889 name); 1890 } 1891 EXPORT_SYMBOL_GPL(typec_find_orientation); 1892 1893 /** 1894 * typec_find_port_power_role - Get the typec port power capability 1895 * @name: port power capability string 1896 * 1897 * This routine is used to find the typec_port_type by its string name. 1898 * 1899 * Returns typec_port_type if success, otherwise negative error code. 1900 */ 1901 int typec_find_port_power_role(const char *name) 1902 { 1903 return match_string(typec_port_power_roles, 1904 ARRAY_SIZE(typec_port_power_roles), name); 1905 } 1906 EXPORT_SYMBOL_GPL(typec_find_port_power_role); 1907 1908 /** 1909 * typec_find_power_role - Find the typec one specific power role 1910 * @name: power role string 1911 * 1912 * This routine is used to find the typec_role by its string name. 1913 * 1914 * Returns typec_role if success, otherwise negative error code. 1915 */ 1916 int typec_find_power_role(const char *name) 1917 { 1918 return match_string(typec_roles, ARRAY_SIZE(typec_roles), name); 1919 } 1920 EXPORT_SYMBOL_GPL(typec_find_power_role); 1921 1922 /** 1923 * typec_find_port_data_role - Get the typec port data capability 1924 * @name: port data capability string 1925 * 1926 * This routine is used to find the typec_port_data by its string name. 1927 * 1928 * Returns typec_port_data if success, otherwise negative error code. 1929 */ 1930 int typec_find_port_data_role(const char *name) 1931 { 1932 return match_string(typec_port_data_roles, 1933 ARRAY_SIZE(typec_port_data_roles), name); 1934 } 1935 EXPORT_SYMBOL_GPL(typec_find_port_data_role); 1936 1937 /* ------------------------------------------ */ 1938 /* API for Multiplexer/DeMultiplexer Switches */ 1939 1940 /** 1941 * typec_set_orientation - Set USB Type-C cable plug orientation 1942 * @port: USB Type-C Port 1943 * @orientation: USB Type-C cable plug orientation 1944 * 1945 * Set cable plug orientation for @port. 1946 */ 1947 int typec_set_orientation(struct typec_port *port, 1948 enum typec_orientation orientation) 1949 { 1950 int ret; 1951 1952 ret = typec_switch_set(port->sw, orientation); 1953 if (ret) 1954 return ret; 1955 1956 port->orientation = orientation; 1957 sysfs_notify(&port->dev.kobj, NULL, "orientation"); 1958 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1959 1960 return 0; 1961 } 1962 EXPORT_SYMBOL_GPL(typec_set_orientation); 1963 1964 /** 1965 * typec_get_orientation - Get USB Type-C cable plug orientation 1966 * @port: USB Type-C Port 1967 * 1968 * Get current cable plug orientation for @port. 1969 */ 1970 enum typec_orientation typec_get_orientation(struct typec_port *port) 1971 { 1972 return port->orientation; 1973 } 1974 EXPORT_SYMBOL_GPL(typec_get_orientation); 1975 1976 /** 1977 * typec_set_mode - Set mode of operation for USB Type-C connector 1978 * @port: USB Type-C connector 1979 * @mode: Accessory Mode, USB Operation or Safe State 1980 * 1981 * Configure @port for Accessory Mode @mode. This function will configure the 1982 * muxes needed for @mode. 1983 */ 1984 int typec_set_mode(struct typec_port *port, int mode) 1985 { 1986 struct typec_mux_state state = { }; 1987 1988 state.mode = mode; 1989 1990 return typec_mux_set(port->mux, &state); 1991 } 1992 EXPORT_SYMBOL_GPL(typec_set_mode); 1993 1994 /* --------------------------------------- */ 1995 1996 /** 1997 * typec_get_negotiated_svdm_version - Get negotiated SVDM Version 1998 * @port: USB Type-C Port. 1999 * 2000 * Get the negotiated SVDM Version. The Version is set to the port default 2001 * value stored in typec_capability on partner registration, and updated after 2002 * a successful Discover Identity if the negotiated value is less than the 2003 * default value. 2004 * 2005 * Returns usb_pd_svdm_ver if the partner has been registered otherwise -ENODEV. 2006 */ 2007 int typec_get_negotiated_svdm_version(struct typec_port *port) 2008 { 2009 enum usb_pd_svdm_ver svdm_version; 2010 struct device *partner_dev; 2011 2012 partner_dev = device_find_child(&port->dev, NULL, partner_match); 2013 if (!partner_dev) 2014 return -ENODEV; 2015 2016 svdm_version = to_typec_partner(partner_dev)->svdm_version; 2017 put_device(partner_dev); 2018 2019 return svdm_version; 2020 } 2021 EXPORT_SYMBOL_GPL(typec_get_negotiated_svdm_version); 2022 2023 /** 2024 * typec_get_drvdata - Return private driver data pointer 2025 * @port: USB Type-C port 2026 */ 2027 void *typec_get_drvdata(struct typec_port *port) 2028 { 2029 return dev_get_drvdata(&port->dev); 2030 } 2031 EXPORT_SYMBOL_GPL(typec_get_drvdata); 2032 2033 int typec_get_fw_cap(struct typec_capability *cap, 2034 struct fwnode_handle *fwnode) 2035 { 2036 const char *cap_str; 2037 int ret; 2038 2039 cap->fwnode = fwnode; 2040 2041 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str); 2042 if (ret < 0) 2043 return ret; 2044 2045 ret = typec_find_port_power_role(cap_str); 2046 if (ret < 0) 2047 return ret; 2048 cap->type = ret; 2049 2050 /* USB data support is optional */ 2051 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str); 2052 if (ret == 0) { 2053 ret = typec_find_port_data_role(cap_str); 2054 if (ret < 0) 2055 return ret; 2056 cap->data = ret; 2057 } 2058 2059 /* Get the preferred power role for a DRP */ 2060 if (cap->type == TYPEC_PORT_DRP) { 2061 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE; 2062 2063 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str); 2064 if (ret == 0) { 2065 ret = typec_find_power_role(cap_str); 2066 if (ret < 0) 2067 return ret; 2068 cap->prefer_role = ret; 2069 } 2070 } 2071 2072 return 0; 2073 } 2074 EXPORT_SYMBOL_GPL(typec_get_fw_cap); 2075 2076 /** 2077 * typec_port_register_altmode - Register USB Type-C Port Alternate Mode 2078 * @port: USB Type-C Port that supports the alternate mode 2079 * @desc: Description of the alternate mode 2080 * 2081 * This routine is used to register an alternate mode that @port is capable of 2082 * supporting. 2083 * 2084 * Returns handle to the alternate mode on success or ERR_PTR on failure. 2085 */ 2086 struct typec_altmode * 2087 typec_port_register_altmode(struct typec_port *port, 2088 const struct typec_altmode_desc *desc) 2089 { 2090 struct typec_altmode *adev; 2091 struct typec_mux *mux; 2092 2093 mux = typec_mux_get(&port->dev, desc); 2094 if (IS_ERR(mux)) 2095 return ERR_CAST(mux); 2096 2097 adev = typec_register_altmode(&port->dev, desc); 2098 if (IS_ERR(adev)) 2099 typec_mux_put(mux); 2100 else 2101 to_altmode(adev)->mux = mux; 2102 2103 return adev; 2104 } 2105 EXPORT_SYMBOL_GPL(typec_port_register_altmode); 2106 2107 void typec_port_register_altmodes(struct typec_port *port, 2108 const struct typec_altmode_ops *ops, void *drvdata, 2109 struct typec_altmode **altmodes, size_t n) 2110 { 2111 struct fwnode_handle *altmodes_node, *child; 2112 struct typec_altmode_desc desc; 2113 struct typec_altmode *alt; 2114 size_t index = 0; 2115 u32 svid, vdo; 2116 int ret; 2117 2118 altmodes_node = device_get_named_child_node(&port->dev, "altmodes"); 2119 if (!altmodes_node) 2120 return; /* No altmodes specified */ 2121 2122 fwnode_for_each_child_node(altmodes_node, child) { 2123 ret = fwnode_property_read_u32(child, "svid", &svid); 2124 if (ret) { 2125 dev_err(&port->dev, "Error reading svid for altmode %s\n", 2126 fwnode_get_name(child)); 2127 continue; 2128 } 2129 2130 ret = fwnode_property_read_u32(child, "vdo", &vdo); 2131 if (ret) { 2132 dev_err(&port->dev, "Error reading vdo for altmode %s\n", 2133 fwnode_get_name(child)); 2134 continue; 2135 } 2136 2137 if (index >= n) { 2138 dev_err(&port->dev, "Error not enough space for altmode %s\n", 2139 fwnode_get_name(child)); 2140 continue; 2141 } 2142 2143 desc.svid = svid; 2144 desc.vdo = vdo; 2145 desc.mode = index + 1; 2146 alt = typec_port_register_altmode(port, &desc); 2147 if (IS_ERR(alt)) { 2148 dev_err(&port->dev, "Error registering altmode %s\n", 2149 fwnode_get_name(child)); 2150 continue; 2151 } 2152 2153 alt->ops = ops; 2154 typec_altmode_set_drvdata(alt, drvdata); 2155 altmodes[index] = alt; 2156 index++; 2157 } 2158 } 2159 EXPORT_SYMBOL_GPL(typec_port_register_altmodes); 2160 2161 /** 2162 * typec_register_port - Register a USB Type-C Port 2163 * @parent: Parent device 2164 * @cap: Description of the port 2165 * 2166 * Registers a device for USB Type-C Port described in @cap. 2167 * 2168 * Returns handle to the port on success or ERR_PTR on failure. 2169 */ 2170 struct typec_port *typec_register_port(struct device *parent, 2171 const struct typec_capability *cap) 2172 { 2173 struct typec_port *port; 2174 int ret; 2175 int id; 2176 2177 port = kzalloc(sizeof(*port), GFP_KERNEL); 2178 if (!port) 2179 return ERR_PTR(-ENOMEM); 2180 2181 id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL); 2182 if (id < 0) { 2183 kfree(port); 2184 return ERR_PTR(id); 2185 } 2186 2187 switch (cap->type) { 2188 case TYPEC_PORT_SRC: 2189 port->pwr_role = TYPEC_SOURCE; 2190 port->vconn_role = TYPEC_SOURCE; 2191 break; 2192 case TYPEC_PORT_SNK: 2193 port->pwr_role = TYPEC_SINK; 2194 port->vconn_role = TYPEC_SINK; 2195 break; 2196 case TYPEC_PORT_DRP: 2197 if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE) 2198 port->pwr_role = cap->prefer_role; 2199 else 2200 port->pwr_role = TYPEC_SINK; 2201 break; 2202 } 2203 2204 switch (cap->data) { 2205 case TYPEC_PORT_DFP: 2206 port->data_role = TYPEC_HOST; 2207 break; 2208 case TYPEC_PORT_UFP: 2209 port->data_role = TYPEC_DEVICE; 2210 break; 2211 case TYPEC_PORT_DRD: 2212 if (cap->prefer_role == TYPEC_SOURCE) 2213 port->data_role = TYPEC_HOST; 2214 else 2215 port->data_role = TYPEC_DEVICE; 2216 break; 2217 } 2218 2219 ida_init(&port->mode_ids); 2220 mutex_init(&port->port_type_lock); 2221 2222 port->id = id; 2223 port->ops = cap->ops; 2224 port->port_type = cap->type; 2225 port->prefer_role = cap->prefer_role; 2226 2227 device_initialize(&port->dev); 2228 port->dev.class = &typec_class; 2229 port->dev.parent = parent; 2230 port->dev.fwnode = cap->fwnode; 2231 port->dev.type = &typec_port_dev_type; 2232 dev_set_name(&port->dev, "port%d", id); 2233 dev_set_drvdata(&port->dev, cap->driver_data); 2234 2235 port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL); 2236 if (!port->cap) { 2237 put_device(&port->dev); 2238 return ERR_PTR(-ENOMEM); 2239 } 2240 2241 port->sw = typec_switch_get(&port->dev); 2242 if (IS_ERR(port->sw)) { 2243 ret = PTR_ERR(port->sw); 2244 put_device(&port->dev); 2245 return ERR_PTR(ret); 2246 } 2247 2248 port->mux = typec_mux_get(&port->dev, NULL); 2249 if (IS_ERR(port->mux)) { 2250 ret = PTR_ERR(port->mux); 2251 put_device(&port->dev); 2252 return ERR_PTR(ret); 2253 } 2254 2255 port->retimer = typec_retimer_get(&port->dev); 2256 if (IS_ERR(port->retimer)) { 2257 ret = PTR_ERR(port->retimer); 2258 put_device(&port->dev); 2259 return ERR_PTR(ret); 2260 } 2261 2262 ret = device_add(&port->dev); 2263 if (ret) { 2264 dev_err(parent, "failed to register port (%d)\n", ret); 2265 put_device(&port->dev); 2266 return ERR_PTR(ret); 2267 } 2268 2269 ret = typec_port_set_usb_power_delivery(port, cap->pd); 2270 if (ret) { 2271 dev_err(&port->dev, "failed to link pd\n"); 2272 device_unregister(&port->dev); 2273 return ERR_PTR(ret); 2274 } 2275 2276 ret = typec_link_ports(port); 2277 if (ret) 2278 dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret); 2279 2280 return port; 2281 } 2282 EXPORT_SYMBOL_GPL(typec_register_port); 2283 2284 /** 2285 * typec_unregister_port - Unregister a USB Type-C Port 2286 * @port: The port to be unregistered 2287 * 2288 * Unregister device created with typec_register_port(). 2289 */ 2290 void typec_unregister_port(struct typec_port *port) 2291 { 2292 if (!IS_ERR_OR_NULL(port)) { 2293 typec_unlink_ports(port); 2294 typec_port_set_usb_power_delivery(port, NULL); 2295 device_unregister(&port->dev); 2296 } 2297 } 2298 EXPORT_SYMBOL_GPL(typec_unregister_port); 2299 2300 static int __init typec_init(void) 2301 { 2302 int ret; 2303 2304 ret = bus_register(&typec_bus); 2305 if (ret) 2306 return ret; 2307 2308 ret = class_register(&typec_mux_class); 2309 if (ret) 2310 goto err_unregister_bus; 2311 2312 ret = class_register(&retimer_class); 2313 if (ret) 2314 goto err_unregister_mux_class; 2315 2316 ret = class_register(&typec_class); 2317 if (ret) 2318 goto err_unregister_retimer_class; 2319 2320 ret = usb_power_delivery_init(); 2321 if (ret) 2322 goto err_unregister_class; 2323 2324 return 0; 2325 2326 err_unregister_class: 2327 class_unregister(&typec_class); 2328 2329 err_unregister_retimer_class: 2330 class_unregister(&retimer_class); 2331 2332 err_unregister_mux_class: 2333 class_unregister(&typec_mux_class); 2334 2335 err_unregister_bus: 2336 bus_unregister(&typec_bus); 2337 2338 return ret; 2339 } 2340 subsys_initcall(typec_init); 2341 2342 static void __exit typec_exit(void) 2343 { 2344 usb_power_delivery_exit(); 2345 class_unregister(&typec_class); 2346 ida_destroy(&typec_index_ida); 2347 bus_unregister(&typec_bus); 2348 class_unregister(&typec_mux_class); 2349 class_unregister(&retimer_class); 2350 } 2351 module_exit(typec_exit); 2352 2353 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); 2354 MODULE_LICENSE("GPL v2"); 2355 MODULE_DESCRIPTION("USB Type-C Connector Class"); 2356