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 struct typec_altmode *partner_adev; 266 267 if (!partner) 268 return; 269 270 adev = &altmode->adev; 271 partner_adev = &partner->adev; 272 273 if (is_typec_plug(adev->dev.parent)) { 274 struct typec_plug *plug = to_typec_plug(adev->dev.parent); 275 276 partner->plug[plug->index] = NULL; 277 } else { 278 partner->partner = NULL; 279 } 280 put_device(&partner_adev->dev); 281 } 282 283 /** 284 * typec_altmode_update_active - Report Enter/Exit mode 285 * @adev: Handle to the alternate mode 286 * @active: True when the mode has been entered 287 * 288 * If a partner or cable plug executes Enter/Exit Mode command successfully, the 289 * drivers use this routine to report the updated state of the mode. 290 */ 291 void typec_altmode_update_active(struct typec_altmode *adev, bool active) 292 { 293 char dir[6]; 294 295 if (adev->active == active) 296 return; 297 298 if (!is_typec_port(adev->dev.parent) && adev->dev.driver) { 299 if (!active) 300 module_put(adev->dev.driver->owner); 301 else 302 WARN_ON(!try_module_get(adev->dev.driver->owner)); 303 } 304 305 adev->active = active; 306 snprintf(dir, sizeof(dir), "mode%d", adev->mode); 307 sysfs_notify(&adev->dev.kobj, dir, "active"); 308 sysfs_notify(&adev->dev.kobj, NULL, "active"); 309 kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE); 310 } 311 EXPORT_SYMBOL_GPL(typec_altmode_update_active); 312 313 /** 314 * typec_altmode2port - Alternate Mode to USB Type-C port 315 * @alt: The Alternate Mode 316 * 317 * Returns handle to the port that a cable plug or partner with @alt is 318 * connected to. 319 */ 320 struct typec_port *typec_altmode2port(struct typec_altmode *alt) 321 { 322 if (is_typec_plug(alt->dev.parent)) 323 return to_typec_port(alt->dev.parent->parent->parent); 324 if (is_typec_partner(alt->dev.parent)) 325 return to_typec_port(alt->dev.parent->parent); 326 if (is_typec_port(alt->dev.parent)) 327 return to_typec_port(alt->dev.parent); 328 329 return NULL; 330 } 331 EXPORT_SYMBOL_GPL(typec_altmode2port); 332 333 static ssize_t 334 vdo_show(struct device *dev, struct device_attribute *attr, char *buf) 335 { 336 struct typec_altmode *alt = to_typec_altmode(dev); 337 338 return sprintf(buf, "0x%08x\n", alt->vdo); 339 } 340 static DEVICE_ATTR_RO(vdo); 341 342 static ssize_t 343 description_show(struct device *dev, struct device_attribute *attr, char *buf) 344 { 345 struct typec_altmode *alt = to_typec_altmode(dev); 346 347 return sprintf(buf, "%s\n", alt->desc ? alt->desc : ""); 348 } 349 static DEVICE_ATTR_RO(description); 350 351 static ssize_t 352 active_show(struct device *dev, struct device_attribute *attr, char *buf) 353 { 354 struct typec_altmode *alt = to_typec_altmode(dev); 355 356 return sprintf(buf, "%s\n", alt->active ? "yes" : "no"); 357 } 358 359 static ssize_t active_store(struct device *dev, struct device_attribute *attr, 360 const char *buf, size_t size) 361 { 362 struct typec_altmode *adev = to_typec_altmode(dev); 363 struct altmode *altmode = to_altmode(adev); 364 bool enter; 365 int ret; 366 367 ret = kstrtobool(buf, &enter); 368 if (ret) 369 return ret; 370 371 if (adev->active == enter) 372 return size; 373 374 if (is_typec_port(adev->dev.parent)) { 375 typec_altmode_update_active(adev, enter); 376 377 /* Make sure that the partner exits the mode before disabling */ 378 if (altmode->partner && !enter && altmode->partner->adev.active) 379 typec_altmode_exit(&altmode->partner->adev); 380 } else if (altmode->partner) { 381 if (enter && !altmode->partner->adev.active) { 382 dev_warn(dev, "port has the mode disabled\n"); 383 return -EPERM; 384 } 385 } 386 387 /* Note: If there is no driver, the mode will not be entered */ 388 if (adev->ops && adev->ops->activate) { 389 ret = adev->ops->activate(adev, enter); 390 if (ret) 391 return ret; 392 } 393 394 return size; 395 } 396 static DEVICE_ATTR_RW(active); 397 398 static ssize_t 399 supported_roles_show(struct device *dev, struct device_attribute *attr, 400 char *buf) 401 { 402 struct altmode *alt = to_altmode(to_typec_altmode(dev)); 403 ssize_t ret; 404 405 switch (alt->roles) { 406 case TYPEC_PORT_SRC: 407 ret = sprintf(buf, "source\n"); 408 break; 409 case TYPEC_PORT_SNK: 410 ret = sprintf(buf, "sink\n"); 411 break; 412 case TYPEC_PORT_DRP: 413 default: 414 ret = sprintf(buf, "source sink\n"); 415 break; 416 } 417 return ret; 418 } 419 static DEVICE_ATTR_RO(supported_roles); 420 421 static ssize_t 422 mode_show(struct device *dev, struct device_attribute *attr, char *buf) 423 { 424 struct typec_altmode *adev = to_typec_altmode(dev); 425 426 return sprintf(buf, "%u\n", adev->mode); 427 } 428 static DEVICE_ATTR_RO(mode); 429 430 static ssize_t 431 svid_show(struct device *dev, struct device_attribute *attr, char *buf) 432 { 433 struct typec_altmode *adev = to_typec_altmode(dev); 434 435 return sprintf(buf, "%04x\n", adev->svid); 436 } 437 static DEVICE_ATTR_RO(svid); 438 439 static struct attribute *typec_altmode_attrs[] = { 440 &dev_attr_active.attr, 441 &dev_attr_mode.attr, 442 &dev_attr_svid.attr, 443 &dev_attr_vdo.attr, 444 NULL 445 }; 446 447 static umode_t typec_altmode_attr_is_visible(struct kobject *kobj, 448 struct attribute *attr, int n) 449 { 450 struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj)); 451 452 if (attr == &dev_attr_active.attr) 453 if (!adev->ops || !adev->ops->activate) 454 return 0444; 455 456 return attr->mode; 457 } 458 459 static const struct attribute_group typec_altmode_group = { 460 .is_visible = typec_altmode_attr_is_visible, 461 .attrs = typec_altmode_attrs, 462 }; 463 464 static const struct attribute_group *typec_altmode_groups[] = { 465 &typec_altmode_group, 466 NULL 467 }; 468 469 static int altmode_id_get(struct device *dev) 470 { 471 struct ida *ids; 472 473 if (is_typec_partner(dev)) 474 ids = &to_typec_partner(dev)->mode_ids; 475 else if (is_typec_plug(dev)) 476 ids = &to_typec_plug(dev)->mode_ids; 477 else 478 ids = &to_typec_port(dev)->mode_ids; 479 480 return ida_simple_get(ids, 0, 0, GFP_KERNEL); 481 } 482 483 static void altmode_id_remove(struct device *dev, int id) 484 { 485 struct ida *ids; 486 487 if (is_typec_partner(dev)) 488 ids = &to_typec_partner(dev)->mode_ids; 489 else if (is_typec_plug(dev)) 490 ids = &to_typec_plug(dev)->mode_ids; 491 else 492 ids = &to_typec_port(dev)->mode_ids; 493 494 ida_simple_remove(ids, id); 495 } 496 497 static void typec_altmode_release(struct device *dev) 498 { 499 struct altmode *alt = to_altmode(to_typec_altmode(dev)); 500 501 if (!is_typec_port(dev->parent)) 502 typec_altmode_put_partner(alt); 503 504 altmode_id_remove(alt->adev.dev.parent, alt->id); 505 kfree(alt); 506 } 507 508 const struct device_type typec_altmode_dev_type = { 509 .name = "typec_alternate_mode", 510 .groups = typec_altmode_groups, 511 .release = typec_altmode_release, 512 }; 513 514 static struct typec_altmode * 515 typec_register_altmode(struct device *parent, 516 const struct typec_altmode_desc *desc) 517 { 518 unsigned int id = altmode_id_get(parent); 519 bool is_port = is_typec_port(parent); 520 struct altmode *alt; 521 int ret; 522 523 alt = kzalloc(sizeof(*alt), GFP_KERNEL); 524 if (!alt) { 525 altmode_id_remove(parent, id); 526 return ERR_PTR(-ENOMEM); 527 } 528 529 alt->adev.svid = desc->svid; 530 alt->adev.mode = desc->mode; 531 alt->adev.vdo = desc->vdo; 532 alt->roles = desc->roles; 533 alt->id = id; 534 535 alt->attrs[0] = &dev_attr_vdo.attr; 536 alt->attrs[1] = &dev_attr_description.attr; 537 alt->attrs[2] = &dev_attr_active.attr; 538 539 if (is_port) { 540 alt->attrs[3] = &dev_attr_supported_roles.attr; 541 alt->adev.active = true; /* Enabled by default */ 542 } 543 544 sprintf(alt->group_name, "mode%d", desc->mode); 545 alt->group.name = alt->group_name; 546 alt->group.attrs = alt->attrs; 547 alt->groups[0] = &alt->group; 548 549 alt->adev.dev.parent = parent; 550 alt->adev.dev.groups = alt->groups; 551 alt->adev.dev.type = &typec_altmode_dev_type; 552 dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id); 553 554 /* Link partners and plugs with the ports */ 555 if (!is_port) 556 typec_altmode_set_partner(alt); 557 558 /* The partners are bind to drivers */ 559 if (is_typec_partner(parent)) 560 alt->adev.dev.bus = &typec_bus; 561 562 /* Plug alt modes need a class to generate udev events. */ 563 if (is_typec_plug(parent)) 564 alt->adev.dev.class = &typec_class; 565 566 ret = device_register(&alt->adev.dev); 567 if (ret) { 568 dev_err(parent, "failed to register alternate mode (%d)\n", 569 ret); 570 put_device(&alt->adev.dev); 571 return ERR_PTR(ret); 572 } 573 574 return &alt->adev; 575 } 576 577 /** 578 * typec_unregister_altmode - Unregister Alternate Mode 579 * @adev: The alternate mode to be unregistered 580 * 581 * Unregister device created with typec_partner_register_altmode(), 582 * typec_plug_register_altmode() or typec_port_register_altmode(). 583 */ 584 void typec_unregister_altmode(struct typec_altmode *adev) 585 { 586 if (IS_ERR_OR_NULL(adev)) 587 return; 588 typec_retimer_put(to_altmode(adev)->retimer); 589 typec_mux_put(to_altmode(adev)->mux); 590 device_unregister(&adev->dev); 591 } 592 EXPORT_SYMBOL_GPL(typec_unregister_altmode); 593 594 /* ------------------------------------------------------------------------- */ 595 /* Type-C Partners */ 596 597 static ssize_t accessory_mode_show(struct device *dev, 598 struct device_attribute *attr, 599 char *buf) 600 { 601 struct typec_partner *p = to_typec_partner(dev); 602 603 return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]); 604 } 605 static DEVICE_ATTR_RO(accessory_mode); 606 607 static ssize_t supports_usb_power_delivery_show(struct device *dev, 608 struct device_attribute *attr, 609 char *buf) 610 { 611 struct typec_partner *p = to_typec_partner(dev); 612 613 return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no"); 614 } 615 static DEVICE_ATTR_RO(supports_usb_power_delivery); 616 617 static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr, 618 char *buf) 619 { 620 struct typec_partner *partner; 621 struct typec_plug *plug; 622 int num_altmodes; 623 624 if (is_typec_partner(dev)) { 625 partner = to_typec_partner(dev); 626 num_altmodes = partner->num_altmodes; 627 } else if (is_typec_plug(dev)) { 628 plug = to_typec_plug(dev); 629 num_altmodes = plug->num_altmodes; 630 } else { 631 return 0; 632 } 633 634 return sysfs_emit(buf, "%d\n", num_altmodes); 635 } 636 static DEVICE_ATTR_RO(number_of_alternate_modes); 637 638 static struct attribute *typec_partner_attrs[] = { 639 &dev_attr_accessory_mode.attr, 640 &dev_attr_supports_usb_power_delivery.attr, 641 &dev_attr_number_of_alternate_modes.attr, 642 &dev_attr_type.attr, 643 &dev_attr_usb_power_delivery_revision.attr, 644 NULL 645 }; 646 647 static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) 648 { 649 struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj)); 650 651 if (attr == &dev_attr_number_of_alternate_modes.attr) { 652 if (partner->num_altmodes < 0) 653 return 0; 654 } 655 656 if (attr == &dev_attr_type.attr) 657 if (!get_pd_product_type(kobj_to_dev(kobj))) 658 return 0; 659 660 return attr->mode; 661 } 662 663 static const struct attribute_group typec_partner_group = { 664 .is_visible = typec_partner_attr_is_visible, 665 .attrs = typec_partner_attrs 666 }; 667 668 static const struct attribute_group *typec_partner_groups[] = { 669 &typec_partner_group, 670 NULL 671 }; 672 673 static void typec_partner_release(struct device *dev) 674 { 675 struct typec_partner *partner = to_typec_partner(dev); 676 677 ida_destroy(&partner->mode_ids); 678 kfree(partner); 679 } 680 681 const struct device_type typec_partner_dev_type = { 682 .name = "typec_partner", 683 .groups = typec_partner_groups, 684 .release = typec_partner_release, 685 }; 686 687 /** 688 * typec_partner_set_identity - Report result from Discover Identity command 689 * @partner: The partner updated identity values 690 * 691 * This routine is used to report that the result of Discover Identity USB power 692 * delivery command has become available. 693 */ 694 int typec_partner_set_identity(struct typec_partner *partner) 695 { 696 if (!partner->identity) 697 return -EINVAL; 698 699 typec_report_identity(&partner->dev); 700 return 0; 701 } 702 EXPORT_SYMBOL_GPL(typec_partner_set_identity); 703 704 /** 705 * typec_partner_set_pd_revision - Set the PD revision supported by the partner 706 * @partner: The partner to be updated. 707 * @pd_revision: USB Power Delivery Specification Revision supported by partner 708 * 709 * This routine is used to report that the PD revision of the port partner has 710 * become available. 711 */ 712 void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision) 713 { 714 if (partner->pd_revision == pd_revision) 715 return; 716 717 partner->pd_revision = pd_revision; 718 sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision"); 719 if (pd_revision != 0 && !partner->usb_pd) { 720 partner->usb_pd = 1; 721 sysfs_notify(&partner->dev.kobj, NULL, 722 "supports_usb_power_delivery"); 723 } 724 kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE); 725 } 726 EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision); 727 728 /** 729 * typec_partner_set_usb_power_delivery - Declare USB Power Delivery Contract. 730 * @partner: The partner device. 731 * @pd: The USB PD instance. 732 * 733 * This routine can be used to declare USB Power Delivery Contract with @partner 734 * by linking @partner to @pd which contains the objects that were used during the 735 * negotiation of the contract. 736 * 737 * If @pd is NULL, the link is removed and the contract with @partner has ended. 738 */ 739 int typec_partner_set_usb_power_delivery(struct typec_partner *partner, 740 struct usb_power_delivery *pd) 741 { 742 int ret; 743 744 if (IS_ERR_OR_NULL(partner) || partner->pd == pd) 745 return 0; 746 747 if (pd) { 748 ret = usb_power_delivery_link_device(pd, &partner->dev); 749 if (ret) 750 return ret; 751 } else { 752 usb_power_delivery_unlink_device(partner->pd, &partner->dev); 753 } 754 755 partner->pd = pd; 756 757 return 0; 758 } 759 EXPORT_SYMBOL_GPL(typec_partner_set_usb_power_delivery); 760 761 /** 762 * typec_partner_set_num_altmodes - Set the number of available partner altmodes 763 * @partner: The partner to be updated. 764 * @num_altmodes: The number of altmodes we want to specify as available. 765 * 766 * This routine is used to report the number of alternate modes supported by the 767 * partner. This value is *not* enforced in alternate mode registration routines. 768 * 769 * @partner.num_altmodes is set to -1 on partner registration, denoting that 770 * a valid value has not been set for it yet. 771 * 772 * Returns 0 on success or negative error number on failure. 773 */ 774 int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes) 775 { 776 int ret; 777 778 if (num_altmodes < 0) 779 return -EINVAL; 780 781 partner->num_altmodes = num_altmodes; 782 ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group); 783 if (ret < 0) 784 return ret; 785 786 sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes"); 787 kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE); 788 789 return 0; 790 } 791 EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes); 792 793 /** 794 * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode 795 * @partner: USB Type-C Partner that supports the alternate mode 796 * @desc: Description of the alternate mode 797 * 798 * This routine is used to register each alternate mode individually that 799 * @partner has listed in response to Discover SVIDs command. The modes for a 800 * SVID listed in response to Discover Modes command need to be listed in an 801 * array in @desc. 802 * 803 * Returns handle to the alternate mode on success or ERR_PTR on failure. 804 */ 805 struct typec_altmode * 806 typec_partner_register_altmode(struct typec_partner *partner, 807 const struct typec_altmode_desc *desc) 808 { 809 return typec_register_altmode(&partner->dev, desc); 810 } 811 EXPORT_SYMBOL_GPL(typec_partner_register_altmode); 812 813 /** 814 * typec_partner_set_svdm_version - Set negotiated Structured VDM (SVDM) Version 815 * @partner: USB Type-C Partner that supports SVDM 816 * @svdm_version: Negotiated SVDM Version 817 * 818 * This routine is used to save the negotiated SVDM Version. 819 */ 820 void typec_partner_set_svdm_version(struct typec_partner *partner, 821 enum usb_pd_svdm_ver svdm_version) 822 { 823 partner->svdm_version = svdm_version; 824 } 825 EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version); 826 827 /** 828 * typec_partner_usb_power_delivery_register - Register Type-C partner USB Power Delivery Support 829 * @partner: Type-C partner device. 830 * @desc: Description of the USB PD contract. 831 * 832 * This routine is a wrapper around usb_power_delivery_register(). It registers 833 * USB Power Delivery Capabilities for a Type-C partner device. Specifically, 834 * it sets the Type-C partner device as a parent for the resulting USB Power Delivery object. 835 * 836 * Returns handle to struct usb_power_delivery or ERR_PTR. 837 */ 838 struct usb_power_delivery * 839 typec_partner_usb_power_delivery_register(struct typec_partner *partner, 840 struct usb_power_delivery_desc *desc) 841 { 842 return usb_power_delivery_register(&partner->dev, desc); 843 } 844 EXPORT_SYMBOL_GPL(typec_partner_usb_power_delivery_register); 845 846 /** 847 * typec_register_partner - Register a USB Type-C Partner 848 * @port: The USB Type-C Port the partner is connected to 849 * @desc: Description of the partner 850 * 851 * Registers a device for USB Type-C Partner described in @desc. 852 * 853 * Returns handle to the partner on success or ERR_PTR on failure. 854 */ 855 struct typec_partner *typec_register_partner(struct typec_port *port, 856 struct typec_partner_desc *desc) 857 { 858 struct typec_partner *partner; 859 int ret; 860 861 partner = kzalloc(sizeof(*partner), GFP_KERNEL); 862 if (!partner) 863 return ERR_PTR(-ENOMEM); 864 865 ida_init(&partner->mode_ids); 866 partner->usb_pd = desc->usb_pd; 867 partner->accessory = desc->accessory; 868 partner->num_altmodes = -1; 869 partner->pd_revision = desc->pd_revision; 870 partner->svdm_version = port->cap->svdm_version; 871 872 if (desc->identity) { 873 /* 874 * Creating directory for the identity only if the driver is 875 * able to provide data to it. 876 */ 877 partner->dev.groups = usb_pd_id_groups; 878 partner->identity = desc->identity; 879 } 880 881 partner->dev.class = &typec_class; 882 partner->dev.parent = &port->dev; 883 partner->dev.type = &typec_partner_dev_type; 884 dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev)); 885 886 ret = device_register(&partner->dev); 887 if (ret) { 888 dev_err(&port->dev, "failed to register partner (%d)\n", ret); 889 put_device(&partner->dev); 890 return ERR_PTR(ret); 891 } 892 893 return partner; 894 } 895 EXPORT_SYMBOL_GPL(typec_register_partner); 896 897 /** 898 * typec_unregister_partner - Unregister a USB Type-C Partner 899 * @partner: The partner to be unregistered 900 * 901 * Unregister device created with typec_register_partner(). 902 */ 903 void typec_unregister_partner(struct typec_partner *partner) 904 { 905 if (!IS_ERR_OR_NULL(partner)) 906 device_unregister(&partner->dev); 907 } 908 EXPORT_SYMBOL_GPL(typec_unregister_partner); 909 910 /* ------------------------------------------------------------------------- */ 911 /* Type-C Cable Plugs */ 912 913 static void typec_plug_release(struct device *dev) 914 { 915 struct typec_plug *plug = to_typec_plug(dev); 916 917 ida_destroy(&plug->mode_ids); 918 kfree(plug); 919 } 920 921 static struct attribute *typec_plug_attrs[] = { 922 &dev_attr_number_of_alternate_modes.attr, 923 NULL 924 }; 925 926 static umode_t typec_plug_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) 927 { 928 struct typec_plug *plug = to_typec_plug(kobj_to_dev(kobj)); 929 930 if (attr == &dev_attr_number_of_alternate_modes.attr) { 931 if (plug->num_altmodes < 0) 932 return 0; 933 } 934 935 return attr->mode; 936 } 937 938 static const struct attribute_group typec_plug_group = { 939 .is_visible = typec_plug_attr_is_visible, 940 .attrs = typec_plug_attrs 941 }; 942 943 static const struct attribute_group *typec_plug_groups[] = { 944 &typec_plug_group, 945 NULL 946 }; 947 948 const struct device_type typec_plug_dev_type = { 949 .name = "typec_plug", 950 .groups = typec_plug_groups, 951 .release = typec_plug_release, 952 }; 953 954 /** 955 * typec_plug_set_num_altmodes - Set the number of available plug altmodes 956 * @plug: The plug to be updated. 957 * @num_altmodes: The number of altmodes we want to specify as available. 958 * 959 * This routine is used to report the number of alternate modes supported by the 960 * plug. This value is *not* enforced in alternate mode registration routines. 961 * 962 * @plug.num_altmodes is set to -1 on plug registration, denoting that 963 * a valid value has not been set for it yet. 964 * 965 * Returns 0 on success or negative error number on failure. 966 */ 967 int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes) 968 { 969 int ret; 970 971 if (num_altmodes < 0) 972 return -EINVAL; 973 974 plug->num_altmodes = num_altmodes; 975 ret = sysfs_update_group(&plug->dev.kobj, &typec_plug_group); 976 if (ret < 0) 977 return ret; 978 979 sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes"); 980 kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE); 981 982 return 0; 983 } 984 EXPORT_SYMBOL_GPL(typec_plug_set_num_altmodes); 985 986 /** 987 * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode 988 * @plug: USB Type-C Cable Plug that supports the alternate mode 989 * @desc: Description of the alternate mode 990 * 991 * This routine is used to register each alternate mode individually that @plug 992 * has listed in response to Discover SVIDs command. The modes for a SVID that 993 * the plug lists in response to Discover Modes command need to be listed in an 994 * array in @desc. 995 * 996 * Returns handle to the alternate mode on success or ERR_PTR on failure. 997 */ 998 struct typec_altmode * 999 typec_plug_register_altmode(struct typec_plug *plug, 1000 const struct typec_altmode_desc *desc) 1001 { 1002 return typec_register_altmode(&plug->dev, desc); 1003 } 1004 EXPORT_SYMBOL_GPL(typec_plug_register_altmode); 1005 1006 /** 1007 * typec_register_plug - Register a USB Type-C Cable Plug 1008 * @cable: USB Type-C Cable with the plug 1009 * @desc: Description of the cable plug 1010 * 1011 * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C 1012 * Cable Plug represents a plug with electronics in it that can response to USB 1013 * Power Delivery SOP Prime or SOP Double Prime packages. 1014 * 1015 * Returns handle to the cable plug on success or ERR_PTR on failure. 1016 */ 1017 struct typec_plug *typec_register_plug(struct typec_cable *cable, 1018 struct typec_plug_desc *desc) 1019 { 1020 struct typec_plug *plug; 1021 char name[8]; 1022 int ret; 1023 1024 plug = kzalloc(sizeof(*plug), GFP_KERNEL); 1025 if (!plug) 1026 return ERR_PTR(-ENOMEM); 1027 1028 sprintf(name, "plug%d", desc->index); 1029 1030 ida_init(&plug->mode_ids); 1031 plug->num_altmodes = -1; 1032 plug->index = desc->index; 1033 plug->dev.class = &typec_class; 1034 plug->dev.parent = &cable->dev; 1035 plug->dev.type = &typec_plug_dev_type; 1036 dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name); 1037 1038 ret = device_register(&plug->dev); 1039 if (ret) { 1040 dev_err(&cable->dev, "failed to register plug (%d)\n", ret); 1041 put_device(&plug->dev); 1042 return ERR_PTR(ret); 1043 } 1044 1045 return plug; 1046 } 1047 EXPORT_SYMBOL_GPL(typec_register_plug); 1048 1049 /** 1050 * typec_unregister_plug - Unregister a USB Type-C Cable Plug 1051 * @plug: The cable plug to be unregistered 1052 * 1053 * Unregister device created with typec_register_plug(). 1054 */ 1055 void typec_unregister_plug(struct typec_plug *plug) 1056 { 1057 if (!IS_ERR_OR_NULL(plug)) 1058 device_unregister(&plug->dev); 1059 } 1060 EXPORT_SYMBOL_GPL(typec_unregister_plug); 1061 1062 /* Type-C Cables */ 1063 1064 static const char * const typec_plug_types[] = { 1065 [USB_PLUG_NONE] = "unknown", 1066 [USB_PLUG_TYPE_A] = "type-a", 1067 [USB_PLUG_TYPE_B] = "type-b", 1068 [USB_PLUG_TYPE_C] = "type-c", 1069 [USB_PLUG_CAPTIVE] = "captive", 1070 }; 1071 1072 static ssize_t plug_type_show(struct device *dev, 1073 struct device_attribute *attr, char *buf) 1074 { 1075 struct typec_cable *cable = to_typec_cable(dev); 1076 1077 return sprintf(buf, "%s\n", typec_plug_types[cable->type]); 1078 } 1079 static DEVICE_ATTR_RO(plug_type); 1080 1081 static struct attribute *typec_cable_attrs[] = { 1082 &dev_attr_type.attr, 1083 &dev_attr_plug_type.attr, 1084 &dev_attr_usb_power_delivery_revision.attr, 1085 NULL 1086 }; 1087 ATTRIBUTE_GROUPS(typec_cable); 1088 1089 static void typec_cable_release(struct device *dev) 1090 { 1091 struct typec_cable *cable = to_typec_cable(dev); 1092 1093 kfree(cable); 1094 } 1095 1096 const struct device_type typec_cable_dev_type = { 1097 .name = "typec_cable", 1098 .groups = typec_cable_groups, 1099 .release = typec_cable_release, 1100 }; 1101 1102 static int cable_match(struct device *dev, void *data) 1103 { 1104 return is_typec_cable(dev); 1105 } 1106 1107 /** 1108 * typec_cable_get - Get a reference to the USB Type-C cable 1109 * @port: The USB Type-C Port the cable is connected to 1110 * 1111 * The caller must decrement the reference count with typec_cable_put() after 1112 * use. 1113 */ 1114 struct typec_cable *typec_cable_get(struct typec_port *port) 1115 { 1116 struct device *dev; 1117 1118 dev = device_find_child(&port->dev, NULL, cable_match); 1119 if (!dev) 1120 return NULL; 1121 1122 return to_typec_cable(dev); 1123 } 1124 EXPORT_SYMBOL_GPL(typec_cable_get); 1125 1126 /** 1127 * typec_cable_put - Decrement the reference count on USB Type-C cable 1128 * @cable: The USB Type-C cable 1129 */ 1130 void typec_cable_put(struct typec_cable *cable) 1131 { 1132 put_device(&cable->dev); 1133 } 1134 EXPORT_SYMBOL_GPL(typec_cable_put); 1135 1136 /** 1137 * typec_cable_is_active - Check is the USB Type-C cable active or passive 1138 * @cable: The USB Type-C Cable 1139 * 1140 * Return 1 if the cable is active or 0 if it's passive. 1141 */ 1142 int typec_cable_is_active(struct typec_cable *cable) 1143 { 1144 return cable->active; 1145 } 1146 EXPORT_SYMBOL_GPL(typec_cable_is_active); 1147 1148 /** 1149 * typec_cable_set_identity - Report result from Discover Identity command 1150 * @cable: The cable updated identity values 1151 * 1152 * This routine is used to report that the result of Discover Identity USB power 1153 * delivery command has become available. 1154 */ 1155 int typec_cable_set_identity(struct typec_cable *cable) 1156 { 1157 if (!cable->identity) 1158 return -EINVAL; 1159 1160 typec_report_identity(&cable->dev); 1161 return 0; 1162 } 1163 EXPORT_SYMBOL_GPL(typec_cable_set_identity); 1164 1165 /** 1166 * typec_register_cable - Register a USB Type-C Cable 1167 * @port: The USB Type-C Port the cable is connected to 1168 * @desc: Description of the cable 1169 * 1170 * Registers a device for USB Type-C Cable described in @desc. The cable will be 1171 * parent for the optional cable plug devises. 1172 * 1173 * Returns handle to the cable on success or ERR_PTR on failure. 1174 */ 1175 struct typec_cable *typec_register_cable(struct typec_port *port, 1176 struct typec_cable_desc *desc) 1177 { 1178 struct typec_cable *cable; 1179 int ret; 1180 1181 cable = kzalloc(sizeof(*cable), GFP_KERNEL); 1182 if (!cable) 1183 return ERR_PTR(-ENOMEM); 1184 1185 cable->type = desc->type; 1186 cable->active = desc->active; 1187 cable->pd_revision = desc->pd_revision; 1188 1189 if (desc->identity) { 1190 /* 1191 * Creating directory for the identity only if the driver is 1192 * able to provide data to it. 1193 */ 1194 cable->dev.groups = usb_pd_id_groups; 1195 cable->identity = desc->identity; 1196 } 1197 1198 cable->dev.class = &typec_class; 1199 cable->dev.parent = &port->dev; 1200 cable->dev.type = &typec_cable_dev_type; 1201 dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev)); 1202 1203 ret = device_register(&cable->dev); 1204 if (ret) { 1205 dev_err(&port->dev, "failed to register cable (%d)\n", ret); 1206 put_device(&cable->dev); 1207 return ERR_PTR(ret); 1208 } 1209 1210 return cable; 1211 } 1212 EXPORT_SYMBOL_GPL(typec_register_cable); 1213 1214 /** 1215 * typec_unregister_cable - Unregister a USB Type-C Cable 1216 * @cable: The cable to be unregistered 1217 * 1218 * Unregister device created with typec_register_cable(). 1219 */ 1220 void typec_unregister_cable(struct typec_cable *cable) 1221 { 1222 if (!IS_ERR_OR_NULL(cable)) 1223 device_unregister(&cable->dev); 1224 } 1225 EXPORT_SYMBOL_GPL(typec_unregister_cable); 1226 1227 /* ------------------------------------------------------------------------- */ 1228 /* USB Type-C ports */ 1229 1230 /** 1231 * typec_port_set_usb_power_delivery - Assign USB PD for port. 1232 * @port: USB Type-C port. 1233 * @pd: USB PD instance. 1234 * 1235 * This routine can be used to set the USB Power Delivery Capabilities for @port 1236 * that it will advertise to the partner. 1237 * 1238 * If @pd is NULL, the assignment is removed. 1239 */ 1240 int typec_port_set_usb_power_delivery(struct typec_port *port, struct usb_power_delivery *pd) 1241 { 1242 int ret; 1243 1244 if (IS_ERR_OR_NULL(port) || port->pd == pd) 1245 return 0; 1246 1247 if (pd) { 1248 ret = usb_power_delivery_link_device(pd, &port->dev); 1249 if (ret) 1250 return ret; 1251 } else { 1252 usb_power_delivery_unlink_device(port->pd, &port->dev); 1253 } 1254 1255 port->pd = pd; 1256 1257 return 0; 1258 } 1259 EXPORT_SYMBOL_GPL(typec_port_set_usb_power_delivery); 1260 1261 static ssize_t select_usb_power_delivery_store(struct device *dev, 1262 struct device_attribute *attr, 1263 const char *buf, size_t size) 1264 { 1265 struct typec_port *port = to_typec_port(dev); 1266 struct usb_power_delivery *pd; 1267 1268 if (!port->ops || !port->ops->pd_set) 1269 return -EOPNOTSUPP; 1270 1271 pd = usb_power_delivery_find(buf); 1272 if (!pd) 1273 return -EINVAL; 1274 1275 return port->ops->pd_set(port, pd); 1276 } 1277 1278 static ssize_t select_usb_power_delivery_show(struct device *dev, 1279 struct device_attribute *attr, char *buf) 1280 { 1281 struct typec_port *port = to_typec_port(dev); 1282 struct usb_power_delivery **pds; 1283 int i, ret = 0; 1284 1285 if (!port->ops || !port->ops->pd_get) 1286 return -EOPNOTSUPP; 1287 1288 pds = port->ops->pd_get(port); 1289 if (!pds) 1290 return 0; 1291 1292 for (i = 0; pds[i]; i++) { 1293 if (pds[i] == port->pd) 1294 ret += sysfs_emit_at(buf, ret, "[%s] ", dev_name(&pds[i]->dev)); 1295 else 1296 ret += sysfs_emit_at(buf, ret, "%s ", dev_name(&pds[i]->dev)); 1297 } 1298 1299 buf[ret - 1] = '\n'; 1300 1301 return ret; 1302 } 1303 static DEVICE_ATTR_RW(select_usb_power_delivery); 1304 1305 static struct attribute *port_attrs[] = { 1306 &dev_attr_select_usb_power_delivery.attr, 1307 NULL 1308 }; 1309 1310 static umode_t port_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) 1311 { 1312 struct typec_port *port = to_typec_port(kobj_to_dev(kobj)); 1313 1314 if (!port->pd || !port->ops || !port->ops->pd_get) 1315 return 0; 1316 if (!port->ops->pd_set) 1317 return 0444; 1318 1319 return attr->mode; 1320 } 1321 1322 static const struct attribute_group pd_group = { 1323 .is_visible = port_attr_is_visible, 1324 .attrs = port_attrs, 1325 }; 1326 1327 static const char * const typec_orientations[] = { 1328 [TYPEC_ORIENTATION_NONE] = "unknown", 1329 [TYPEC_ORIENTATION_NORMAL] = "normal", 1330 [TYPEC_ORIENTATION_REVERSE] = "reverse", 1331 }; 1332 1333 static const char * const typec_roles[] = { 1334 [TYPEC_SINK] = "sink", 1335 [TYPEC_SOURCE] = "source", 1336 }; 1337 1338 static const char * const typec_data_roles[] = { 1339 [TYPEC_DEVICE] = "device", 1340 [TYPEC_HOST] = "host", 1341 }; 1342 1343 static const char * const typec_port_power_roles[] = { 1344 [TYPEC_PORT_SRC] = "source", 1345 [TYPEC_PORT_SNK] = "sink", 1346 [TYPEC_PORT_DRP] = "dual", 1347 }; 1348 1349 static const char * const typec_port_data_roles[] = { 1350 [TYPEC_PORT_DFP] = "host", 1351 [TYPEC_PORT_UFP] = "device", 1352 [TYPEC_PORT_DRD] = "dual", 1353 }; 1354 1355 static const char * const typec_port_types_drp[] = { 1356 [TYPEC_PORT_SRC] = "dual [source] sink", 1357 [TYPEC_PORT_SNK] = "dual source [sink]", 1358 [TYPEC_PORT_DRP] = "[dual] source sink", 1359 }; 1360 1361 static ssize_t 1362 preferred_role_store(struct device *dev, struct device_attribute *attr, 1363 const char *buf, size_t size) 1364 { 1365 struct typec_port *port = to_typec_port(dev); 1366 int role; 1367 int ret; 1368 1369 if (port->cap->type != TYPEC_PORT_DRP) { 1370 dev_dbg(dev, "Preferred role only supported with DRP ports\n"); 1371 return -EOPNOTSUPP; 1372 } 1373 1374 if (!port->ops || !port->ops->try_role) { 1375 dev_dbg(dev, "Setting preferred role not supported\n"); 1376 return -EOPNOTSUPP; 1377 } 1378 1379 role = sysfs_match_string(typec_roles, buf); 1380 if (role < 0) { 1381 if (sysfs_streq(buf, "none")) 1382 role = TYPEC_NO_PREFERRED_ROLE; 1383 else 1384 return -EINVAL; 1385 } 1386 1387 ret = port->ops->try_role(port, role); 1388 if (ret) 1389 return ret; 1390 1391 port->prefer_role = role; 1392 return size; 1393 } 1394 1395 static ssize_t 1396 preferred_role_show(struct device *dev, struct device_attribute *attr, 1397 char *buf) 1398 { 1399 struct typec_port *port = to_typec_port(dev); 1400 1401 if (port->cap->type != TYPEC_PORT_DRP) 1402 return 0; 1403 1404 if (port->prefer_role < 0) 1405 return 0; 1406 1407 return sprintf(buf, "%s\n", typec_roles[port->prefer_role]); 1408 } 1409 static DEVICE_ATTR_RW(preferred_role); 1410 1411 static ssize_t data_role_store(struct device *dev, 1412 struct device_attribute *attr, 1413 const char *buf, size_t size) 1414 { 1415 struct typec_port *port = to_typec_port(dev); 1416 int ret; 1417 1418 if (!port->ops || !port->ops->dr_set) { 1419 dev_dbg(dev, "data role swapping not supported\n"); 1420 return -EOPNOTSUPP; 1421 } 1422 1423 ret = sysfs_match_string(typec_data_roles, buf); 1424 if (ret < 0) 1425 return ret; 1426 1427 mutex_lock(&port->port_type_lock); 1428 if (port->cap->data != TYPEC_PORT_DRD) { 1429 ret = -EOPNOTSUPP; 1430 goto unlock_and_ret; 1431 } 1432 1433 ret = port->ops->dr_set(port, ret); 1434 if (ret) 1435 goto unlock_and_ret; 1436 1437 ret = size; 1438 unlock_and_ret: 1439 mutex_unlock(&port->port_type_lock); 1440 return ret; 1441 } 1442 1443 static ssize_t data_role_show(struct device *dev, 1444 struct device_attribute *attr, char *buf) 1445 { 1446 struct typec_port *port = to_typec_port(dev); 1447 1448 if (port->cap->data == TYPEC_PORT_DRD) 1449 return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ? 1450 "[host] device" : "host [device]"); 1451 1452 return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]); 1453 } 1454 static DEVICE_ATTR_RW(data_role); 1455 1456 static ssize_t power_role_store(struct device *dev, 1457 struct device_attribute *attr, 1458 const char *buf, size_t size) 1459 { 1460 struct typec_port *port = to_typec_port(dev); 1461 int ret; 1462 1463 if (!port->ops || !port->ops->pr_set) { 1464 dev_dbg(dev, "power role swapping not supported\n"); 1465 return -EOPNOTSUPP; 1466 } 1467 1468 if (port->pwr_opmode != TYPEC_PWR_MODE_PD) { 1469 dev_dbg(dev, "partner unable to swap power role\n"); 1470 return -EIO; 1471 } 1472 1473 ret = sysfs_match_string(typec_roles, buf); 1474 if (ret < 0) 1475 return ret; 1476 1477 mutex_lock(&port->port_type_lock); 1478 if (port->port_type != TYPEC_PORT_DRP) { 1479 dev_dbg(dev, "port type fixed at \"%s\"", 1480 typec_port_power_roles[port->port_type]); 1481 ret = -EOPNOTSUPP; 1482 goto unlock_and_ret; 1483 } 1484 1485 ret = port->ops->pr_set(port, ret); 1486 if (ret) 1487 goto unlock_and_ret; 1488 1489 ret = size; 1490 unlock_and_ret: 1491 mutex_unlock(&port->port_type_lock); 1492 return ret; 1493 } 1494 1495 static ssize_t power_role_show(struct device *dev, 1496 struct device_attribute *attr, char *buf) 1497 { 1498 struct typec_port *port = to_typec_port(dev); 1499 1500 if (port->cap->type == TYPEC_PORT_DRP) 1501 return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ? 1502 "[source] sink" : "source [sink]"); 1503 1504 return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]); 1505 } 1506 static DEVICE_ATTR_RW(power_role); 1507 1508 static ssize_t 1509 port_type_store(struct device *dev, struct device_attribute *attr, 1510 const char *buf, size_t size) 1511 { 1512 struct typec_port *port = to_typec_port(dev); 1513 int ret; 1514 enum typec_port_type type; 1515 1516 if (port->cap->type != TYPEC_PORT_DRP || 1517 !port->ops || !port->ops->port_type_set) { 1518 dev_dbg(dev, "changing port type not supported\n"); 1519 return -EOPNOTSUPP; 1520 } 1521 1522 ret = sysfs_match_string(typec_port_power_roles, buf); 1523 if (ret < 0) 1524 return ret; 1525 1526 type = ret; 1527 mutex_lock(&port->port_type_lock); 1528 1529 if (port->port_type == type) { 1530 ret = size; 1531 goto unlock_and_ret; 1532 } 1533 1534 ret = port->ops->port_type_set(port, type); 1535 if (ret) 1536 goto unlock_and_ret; 1537 1538 port->port_type = type; 1539 ret = size; 1540 1541 unlock_and_ret: 1542 mutex_unlock(&port->port_type_lock); 1543 return ret; 1544 } 1545 1546 static ssize_t 1547 port_type_show(struct device *dev, struct device_attribute *attr, 1548 char *buf) 1549 { 1550 struct typec_port *port = to_typec_port(dev); 1551 1552 if (port->cap->type == TYPEC_PORT_DRP) 1553 return sprintf(buf, "%s\n", 1554 typec_port_types_drp[port->port_type]); 1555 1556 return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]); 1557 } 1558 static DEVICE_ATTR_RW(port_type); 1559 1560 static const char * const typec_pwr_opmodes[] = { 1561 [TYPEC_PWR_MODE_USB] = "default", 1562 [TYPEC_PWR_MODE_1_5A] = "1.5A", 1563 [TYPEC_PWR_MODE_3_0A] = "3.0A", 1564 [TYPEC_PWR_MODE_PD] = "usb_power_delivery", 1565 }; 1566 1567 static ssize_t power_operation_mode_show(struct device *dev, 1568 struct device_attribute *attr, 1569 char *buf) 1570 { 1571 struct typec_port *port = to_typec_port(dev); 1572 1573 return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]); 1574 } 1575 static DEVICE_ATTR_RO(power_operation_mode); 1576 1577 static ssize_t vconn_source_store(struct device *dev, 1578 struct device_attribute *attr, 1579 const char *buf, size_t size) 1580 { 1581 struct typec_port *port = to_typec_port(dev); 1582 bool source; 1583 int ret; 1584 1585 if (!port->cap->pd_revision) { 1586 dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n"); 1587 return -EOPNOTSUPP; 1588 } 1589 1590 if (!port->ops || !port->ops->vconn_set) { 1591 dev_dbg(dev, "VCONN swapping not supported\n"); 1592 return -EOPNOTSUPP; 1593 } 1594 1595 ret = kstrtobool(buf, &source); 1596 if (ret) 1597 return ret; 1598 1599 ret = port->ops->vconn_set(port, (enum typec_role)source); 1600 if (ret) 1601 return ret; 1602 1603 return size; 1604 } 1605 1606 static ssize_t vconn_source_show(struct device *dev, 1607 struct device_attribute *attr, char *buf) 1608 { 1609 struct typec_port *port = to_typec_port(dev); 1610 1611 return sprintf(buf, "%s\n", 1612 port->vconn_role == TYPEC_SOURCE ? "yes" : "no"); 1613 } 1614 static DEVICE_ATTR_RW(vconn_source); 1615 1616 static ssize_t supported_accessory_modes_show(struct device *dev, 1617 struct device_attribute *attr, 1618 char *buf) 1619 { 1620 struct typec_port *port = to_typec_port(dev); 1621 ssize_t ret = 0; 1622 int i; 1623 1624 for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) { 1625 if (port->cap->accessory[i]) 1626 ret += sprintf(buf + ret, "%s ", 1627 typec_accessory_modes[port->cap->accessory[i]]); 1628 } 1629 1630 if (!ret) 1631 return sprintf(buf, "none\n"); 1632 1633 buf[ret - 1] = '\n'; 1634 1635 return ret; 1636 } 1637 static DEVICE_ATTR_RO(supported_accessory_modes); 1638 1639 static ssize_t usb_typec_revision_show(struct device *dev, 1640 struct device_attribute *attr, 1641 char *buf) 1642 { 1643 struct typec_port *port = to_typec_port(dev); 1644 u16 rev = port->cap->revision; 1645 1646 return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf); 1647 } 1648 static DEVICE_ATTR_RO(usb_typec_revision); 1649 1650 static ssize_t usb_power_delivery_revision_show(struct device *dev, 1651 struct device_attribute *attr, 1652 char *buf) 1653 { 1654 u16 rev = 0; 1655 1656 if (is_typec_partner(dev)) { 1657 struct typec_partner *partner = to_typec_partner(dev); 1658 1659 rev = partner->pd_revision; 1660 } else if (is_typec_cable(dev)) { 1661 struct typec_cable *cable = to_typec_cable(dev); 1662 1663 rev = cable->pd_revision; 1664 } else if (is_typec_port(dev)) { 1665 struct typec_port *p = to_typec_port(dev); 1666 1667 rev = p->cap->pd_revision; 1668 } 1669 return sysfs_emit(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf); 1670 } 1671 1672 static ssize_t orientation_show(struct device *dev, 1673 struct device_attribute *attr, 1674 char *buf) 1675 { 1676 struct typec_port *port = to_typec_port(dev); 1677 1678 return sprintf(buf, "%s\n", typec_orientations[port->orientation]); 1679 } 1680 static DEVICE_ATTR_RO(orientation); 1681 1682 static struct attribute *typec_attrs[] = { 1683 &dev_attr_data_role.attr, 1684 &dev_attr_power_operation_mode.attr, 1685 &dev_attr_power_role.attr, 1686 &dev_attr_preferred_role.attr, 1687 &dev_attr_supported_accessory_modes.attr, 1688 &dev_attr_usb_power_delivery_revision.attr, 1689 &dev_attr_usb_typec_revision.attr, 1690 &dev_attr_vconn_source.attr, 1691 &dev_attr_port_type.attr, 1692 &dev_attr_orientation.attr, 1693 NULL, 1694 }; 1695 1696 static umode_t typec_attr_is_visible(struct kobject *kobj, 1697 struct attribute *attr, int n) 1698 { 1699 struct typec_port *port = to_typec_port(kobj_to_dev(kobj)); 1700 1701 if (attr == &dev_attr_data_role.attr) { 1702 if (port->cap->data != TYPEC_PORT_DRD || 1703 !port->ops || !port->ops->dr_set) 1704 return 0444; 1705 } else if (attr == &dev_attr_power_role.attr) { 1706 if (port->cap->type != TYPEC_PORT_DRP || 1707 !port->ops || !port->ops->pr_set) 1708 return 0444; 1709 } else if (attr == &dev_attr_vconn_source.attr) { 1710 if (!port->cap->pd_revision || 1711 !port->ops || !port->ops->vconn_set) 1712 return 0444; 1713 } else if (attr == &dev_attr_preferred_role.attr) { 1714 if (port->cap->type != TYPEC_PORT_DRP || 1715 !port->ops || !port->ops->try_role) 1716 return 0444; 1717 } else if (attr == &dev_attr_port_type.attr) { 1718 if (!port->ops || !port->ops->port_type_set) 1719 return 0; 1720 if (port->cap->type != TYPEC_PORT_DRP) 1721 return 0444; 1722 } else if (attr == &dev_attr_orientation.attr) { 1723 if (port->cap->orientation_aware) 1724 return 0444; 1725 return 0; 1726 } 1727 1728 return attr->mode; 1729 } 1730 1731 static const struct attribute_group typec_group = { 1732 .is_visible = typec_attr_is_visible, 1733 .attrs = typec_attrs, 1734 }; 1735 1736 static const struct attribute_group *typec_groups[] = { 1737 &typec_group, 1738 &pd_group, 1739 NULL 1740 }; 1741 1742 static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env) 1743 { 1744 int ret; 1745 1746 ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev)); 1747 if (ret) 1748 dev_err(dev, "failed to add uevent TYPEC_PORT\n"); 1749 1750 return ret; 1751 } 1752 1753 static void typec_release(struct device *dev) 1754 { 1755 struct typec_port *port = to_typec_port(dev); 1756 1757 ida_simple_remove(&typec_index_ida, port->id); 1758 ida_destroy(&port->mode_ids); 1759 typec_switch_put(port->sw); 1760 typec_mux_put(port->mux); 1761 typec_retimer_put(port->retimer); 1762 kfree(port->cap); 1763 kfree(port); 1764 } 1765 1766 const struct device_type typec_port_dev_type = { 1767 .name = "typec_port", 1768 .groups = typec_groups, 1769 .uevent = typec_uevent, 1770 .release = typec_release, 1771 }; 1772 1773 /* --------------------------------------- */ 1774 /* Driver callbacks to report role updates */ 1775 1776 static int partner_match(struct device *dev, void *data) 1777 { 1778 return is_typec_partner(dev); 1779 } 1780 1781 /** 1782 * typec_set_data_role - Report data role change 1783 * @port: The USB Type-C Port where the role was changed 1784 * @role: The new data role 1785 * 1786 * This routine is used by the port drivers to report data role changes. 1787 */ 1788 void typec_set_data_role(struct typec_port *port, enum typec_data_role role) 1789 { 1790 struct device *partner_dev; 1791 1792 if (port->data_role == role) 1793 return; 1794 1795 port->data_role = role; 1796 sysfs_notify(&port->dev.kobj, NULL, "data_role"); 1797 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1798 1799 partner_dev = device_find_child(&port->dev, NULL, partner_match); 1800 if (!partner_dev) 1801 return; 1802 1803 if (to_typec_partner(partner_dev)->identity) 1804 typec_product_type_notify(partner_dev); 1805 1806 put_device(partner_dev); 1807 } 1808 EXPORT_SYMBOL_GPL(typec_set_data_role); 1809 1810 /** 1811 * typec_set_pwr_role - Report power role change 1812 * @port: The USB Type-C Port where the role was changed 1813 * @role: The new data role 1814 * 1815 * This routine is used by the port drivers to report power role changes. 1816 */ 1817 void typec_set_pwr_role(struct typec_port *port, enum typec_role role) 1818 { 1819 if (port->pwr_role == role) 1820 return; 1821 1822 port->pwr_role = role; 1823 sysfs_notify(&port->dev.kobj, NULL, "power_role"); 1824 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1825 } 1826 EXPORT_SYMBOL_GPL(typec_set_pwr_role); 1827 1828 /** 1829 * typec_set_vconn_role - Report VCONN source change 1830 * @port: The USB Type-C Port which VCONN role changed 1831 * @role: Source when @port is sourcing VCONN, or Sink when it's not 1832 * 1833 * This routine is used by the port drivers to report if the VCONN source is 1834 * changes. 1835 */ 1836 void typec_set_vconn_role(struct typec_port *port, enum typec_role role) 1837 { 1838 if (port->vconn_role == role) 1839 return; 1840 1841 port->vconn_role = role; 1842 sysfs_notify(&port->dev.kobj, NULL, "vconn_source"); 1843 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1844 } 1845 EXPORT_SYMBOL_GPL(typec_set_vconn_role); 1846 1847 /** 1848 * typec_set_pwr_opmode - Report changed power operation mode 1849 * @port: The USB Type-C Port where the mode was changed 1850 * @opmode: New power operation mode 1851 * 1852 * This routine is used by the port drivers to report changed power operation 1853 * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB 1854 * Type-C specification, and "USB Power Delivery" when the power levels are 1855 * negotiated with methods defined in USB Power Delivery specification. 1856 */ 1857 void typec_set_pwr_opmode(struct typec_port *port, 1858 enum typec_pwr_opmode opmode) 1859 { 1860 struct device *partner_dev; 1861 1862 if (port->pwr_opmode == opmode) 1863 return; 1864 1865 port->pwr_opmode = opmode; 1866 sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode"); 1867 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1868 1869 partner_dev = device_find_child(&port->dev, NULL, partner_match); 1870 if (partner_dev) { 1871 struct typec_partner *partner = to_typec_partner(partner_dev); 1872 1873 if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) { 1874 partner->usb_pd = 1; 1875 sysfs_notify(&partner_dev->kobj, NULL, 1876 "supports_usb_power_delivery"); 1877 kobject_uevent(&partner_dev->kobj, KOBJ_CHANGE); 1878 } 1879 put_device(partner_dev); 1880 } 1881 } 1882 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode); 1883 1884 /** 1885 * typec_find_pwr_opmode - Get the typec power operation mode capability 1886 * @name: power operation mode string 1887 * 1888 * This routine is used to find the typec_pwr_opmode by its string @name. 1889 * 1890 * Returns typec_pwr_opmode if success, otherwise negative error code. 1891 */ 1892 int typec_find_pwr_opmode(const char *name) 1893 { 1894 return match_string(typec_pwr_opmodes, 1895 ARRAY_SIZE(typec_pwr_opmodes), name); 1896 } 1897 EXPORT_SYMBOL_GPL(typec_find_pwr_opmode); 1898 1899 /** 1900 * typec_find_orientation - Convert orientation string to enum typec_orientation 1901 * @name: Orientation string 1902 * 1903 * This routine is used to find the typec_orientation by its string name @name. 1904 * 1905 * Returns the orientation value on success, otherwise negative error code. 1906 */ 1907 int typec_find_orientation(const char *name) 1908 { 1909 return match_string(typec_orientations, ARRAY_SIZE(typec_orientations), 1910 name); 1911 } 1912 EXPORT_SYMBOL_GPL(typec_find_orientation); 1913 1914 /** 1915 * typec_find_port_power_role - Get the typec port power capability 1916 * @name: port power capability string 1917 * 1918 * This routine is used to find the typec_port_type by its string name. 1919 * 1920 * Returns typec_port_type if success, otherwise negative error code. 1921 */ 1922 int typec_find_port_power_role(const char *name) 1923 { 1924 return match_string(typec_port_power_roles, 1925 ARRAY_SIZE(typec_port_power_roles), name); 1926 } 1927 EXPORT_SYMBOL_GPL(typec_find_port_power_role); 1928 1929 /** 1930 * typec_find_power_role - Find the typec one specific power role 1931 * @name: power role string 1932 * 1933 * This routine is used to find the typec_role by its string name. 1934 * 1935 * Returns typec_role if success, otherwise negative error code. 1936 */ 1937 int typec_find_power_role(const char *name) 1938 { 1939 return match_string(typec_roles, ARRAY_SIZE(typec_roles), name); 1940 } 1941 EXPORT_SYMBOL_GPL(typec_find_power_role); 1942 1943 /** 1944 * typec_find_port_data_role - Get the typec port data capability 1945 * @name: port data capability string 1946 * 1947 * This routine is used to find the typec_port_data by its string name. 1948 * 1949 * Returns typec_port_data if success, otherwise negative error code. 1950 */ 1951 int typec_find_port_data_role(const char *name) 1952 { 1953 return match_string(typec_port_data_roles, 1954 ARRAY_SIZE(typec_port_data_roles), name); 1955 } 1956 EXPORT_SYMBOL_GPL(typec_find_port_data_role); 1957 1958 /* ------------------------------------------ */ 1959 /* API for Multiplexer/DeMultiplexer Switches */ 1960 1961 /** 1962 * typec_set_orientation - Set USB Type-C cable plug orientation 1963 * @port: USB Type-C Port 1964 * @orientation: USB Type-C cable plug orientation 1965 * 1966 * Set cable plug orientation for @port. 1967 */ 1968 int typec_set_orientation(struct typec_port *port, 1969 enum typec_orientation orientation) 1970 { 1971 int ret; 1972 1973 ret = typec_switch_set(port->sw, orientation); 1974 if (ret) 1975 return ret; 1976 1977 port->orientation = orientation; 1978 sysfs_notify(&port->dev.kobj, NULL, "orientation"); 1979 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE); 1980 1981 return 0; 1982 } 1983 EXPORT_SYMBOL_GPL(typec_set_orientation); 1984 1985 /** 1986 * typec_get_orientation - Get USB Type-C cable plug orientation 1987 * @port: USB Type-C Port 1988 * 1989 * Get current cable plug orientation for @port. 1990 */ 1991 enum typec_orientation typec_get_orientation(struct typec_port *port) 1992 { 1993 return port->orientation; 1994 } 1995 EXPORT_SYMBOL_GPL(typec_get_orientation); 1996 1997 /** 1998 * typec_set_mode - Set mode of operation for USB Type-C connector 1999 * @port: USB Type-C connector 2000 * @mode: Accessory Mode, USB Operation or Safe State 2001 * 2002 * Configure @port for Accessory Mode @mode. This function will configure the 2003 * muxes needed for @mode. 2004 */ 2005 int typec_set_mode(struct typec_port *port, int mode) 2006 { 2007 struct typec_mux_state state = { }; 2008 2009 state.mode = mode; 2010 2011 return typec_mux_set(port->mux, &state); 2012 } 2013 EXPORT_SYMBOL_GPL(typec_set_mode); 2014 2015 /* --------------------------------------- */ 2016 2017 /** 2018 * typec_get_negotiated_svdm_version - Get negotiated SVDM Version 2019 * @port: USB Type-C Port. 2020 * 2021 * Get the negotiated SVDM Version. The Version is set to the port default 2022 * value stored in typec_capability on partner registration, and updated after 2023 * a successful Discover Identity if the negotiated value is less than the 2024 * default value. 2025 * 2026 * Returns usb_pd_svdm_ver if the partner has been registered otherwise -ENODEV. 2027 */ 2028 int typec_get_negotiated_svdm_version(struct typec_port *port) 2029 { 2030 enum usb_pd_svdm_ver svdm_version; 2031 struct device *partner_dev; 2032 2033 partner_dev = device_find_child(&port->dev, NULL, partner_match); 2034 if (!partner_dev) 2035 return -ENODEV; 2036 2037 svdm_version = to_typec_partner(partner_dev)->svdm_version; 2038 put_device(partner_dev); 2039 2040 return svdm_version; 2041 } 2042 EXPORT_SYMBOL_GPL(typec_get_negotiated_svdm_version); 2043 2044 /** 2045 * typec_get_drvdata - Return private driver data pointer 2046 * @port: USB Type-C port 2047 */ 2048 void *typec_get_drvdata(struct typec_port *port) 2049 { 2050 return dev_get_drvdata(&port->dev); 2051 } 2052 EXPORT_SYMBOL_GPL(typec_get_drvdata); 2053 2054 int typec_get_fw_cap(struct typec_capability *cap, 2055 struct fwnode_handle *fwnode) 2056 { 2057 const char *cap_str; 2058 int ret; 2059 2060 cap->fwnode = fwnode; 2061 2062 ret = fwnode_property_read_string(fwnode, "power-role", &cap_str); 2063 if (ret < 0) 2064 return ret; 2065 2066 ret = typec_find_port_power_role(cap_str); 2067 if (ret < 0) 2068 return ret; 2069 cap->type = ret; 2070 2071 /* USB data support is optional */ 2072 ret = fwnode_property_read_string(fwnode, "data-role", &cap_str); 2073 if (ret == 0) { 2074 ret = typec_find_port_data_role(cap_str); 2075 if (ret < 0) 2076 return ret; 2077 cap->data = ret; 2078 } 2079 2080 /* Get the preferred power role for a DRP */ 2081 if (cap->type == TYPEC_PORT_DRP) { 2082 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE; 2083 2084 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str); 2085 if (ret == 0) { 2086 ret = typec_find_power_role(cap_str); 2087 if (ret < 0) 2088 return ret; 2089 cap->prefer_role = ret; 2090 } 2091 } 2092 2093 return 0; 2094 } 2095 EXPORT_SYMBOL_GPL(typec_get_fw_cap); 2096 2097 /** 2098 * typec_port_register_altmode - Register USB Type-C Port Alternate Mode 2099 * @port: USB Type-C Port that supports the alternate mode 2100 * @desc: Description of the alternate mode 2101 * 2102 * This routine is used to register an alternate mode that @port is capable of 2103 * supporting. 2104 * 2105 * Returns handle to the alternate mode on success or ERR_PTR on failure. 2106 */ 2107 struct typec_altmode * 2108 typec_port_register_altmode(struct typec_port *port, 2109 const struct typec_altmode_desc *desc) 2110 { 2111 struct typec_altmode *adev; 2112 struct typec_mux *mux; 2113 struct typec_retimer *retimer; 2114 2115 mux = typec_mux_get(&port->dev); 2116 if (IS_ERR(mux)) 2117 return ERR_CAST(mux); 2118 2119 retimer = typec_retimer_get(&port->dev); 2120 if (IS_ERR(retimer)) { 2121 typec_mux_put(mux); 2122 return ERR_CAST(retimer); 2123 } 2124 2125 adev = typec_register_altmode(&port->dev, desc); 2126 if (IS_ERR(adev)) { 2127 typec_retimer_put(retimer); 2128 typec_mux_put(mux); 2129 } else { 2130 to_altmode(adev)->mux = mux; 2131 to_altmode(adev)->retimer = retimer; 2132 } 2133 2134 return adev; 2135 } 2136 EXPORT_SYMBOL_GPL(typec_port_register_altmode); 2137 2138 void typec_port_register_altmodes(struct typec_port *port, 2139 const struct typec_altmode_ops *ops, void *drvdata, 2140 struct typec_altmode **altmodes, size_t n) 2141 { 2142 struct fwnode_handle *altmodes_node, *child; 2143 struct typec_altmode_desc desc; 2144 struct typec_altmode *alt; 2145 size_t index = 0; 2146 u32 svid, vdo; 2147 int ret; 2148 2149 altmodes_node = device_get_named_child_node(&port->dev, "altmodes"); 2150 if (!altmodes_node) 2151 return; /* No altmodes specified */ 2152 2153 fwnode_for_each_child_node(altmodes_node, child) { 2154 ret = fwnode_property_read_u32(child, "svid", &svid); 2155 if (ret) { 2156 dev_err(&port->dev, "Error reading svid for altmode %s\n", 2157 fwnode_get_name(child)); 2158 continue; 2159 } 2160 2161 ret = fwnode_property_read_u32(child, "vdo", &vdo); 2162 if (ret) { 2163 dev_err(&port->dev, "Error reading vdo for altmode %s\n", 2164 fwnode_get_name(child)); 2165 continue; 2166 } 2167 2168 if (index >= n) { 2169 dev_err(&port->dev, "Error not enough space for altmode %s\n", 2170 fwnode_get_name(child)); 2171 continue; 2172 } 2173 2174 desc.svid = svid; 2175 desc.vdo = vdo; 2176 desc.mode = index + 1; 2177 alt = typec_port_register_altmode(port, &desc); 2178 if (IS_ERR(alt)) { 2179 dev_err(&port->dev, "Error registering altmode %s\n", 2180 fwnode_get_name(child)); 2181 continue; 2182 } 2183 2184 alt->ops = ops; 2185 typec_altmode_set_drvdata(alt, drvdata); 2186 altmodes[index] = alt; 2187 index++; 2188 } 2189 } 2190 EXPORT_SYMBOL_GPL(typec_port_register_altmodes); 2191 2192 /** 2193 * typec_register_port - Register a USB Type-C Port 2194 * @parent: Parent device 2195 * @cap: Description of the port 2196 * 2197 * Registers a device for USB Type-C Port described in @cap. 2198 * 2199 * Returns handle to the port on success or ERR_PTR on failure. 2200 */ 2201 struct typec_port *typec_register_port(struct device *parent, 2202 const struct typec_capability *cap) 2203 { 2204 struct typec_port *port; 2205 int ret; 2206 int id; 2207 2208 port = kzalloc(sizeof(*port), GFP_KERNEL); 2209 if (!port) 2210 return ERR_PTR(-ENOMEM); 2211 2212 id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL); 2213 if (id < 0) { 2214 kfree(port); 2215 return ERR_PTR(id); 2216 } 2217 2218 switch (cap->type) { 2219 case TYPEC_PORT_SRC: 2220 port->pwr_role = TYPEC_SOURCE; 2221 port->vconn_role = TYPEC_SOURCE; 2222 break; 2223 case TYPEC_PORT_SNK: 2224 port->pwr_role = TYPEC_SINK; 2225 port->vconn_role = TYPEC_SINK; 2226 break; 2227 case TYPEC_PORT_DRP: 2228 if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE) 2229 port->pwr_role = cap->prefer_role; 2230 else 2231 port->pwr_role = TYPEC_SINK; 2232 break; 2233 } 2234 2235 switch (cap->data) { 2236 case TYPEC_PORT_DFP: 2237 port->data_role = TYPEC_HOST; 2238 break; 2239 case TYPEC_PORT_UFP: 2240 port->data_role = TYPEC_DEVICE; 2241 break; 2242 case TYPEC_PORT_DRD: 2243 if (cap->prefer_role == TYPEC_SOURCE) 2244 port->data_role = TYPEC_HOST; 2245 else 2246 port->data_role = TYPEC_DEVICE; 2247 break; 2248 } 2249 2250 ida_init(&port->mode_ids); 2251 mutex_init(&port->port_type_lock); 2252 2253 port->id = id; 2254 port->ops = cap->ops; 2255 port->port_type = cap->type; 2256 port->prefer_role = cap->prefer_role; 2257 2258 device_initialize(&port->dev); 2259 port->dev.class = &typec_class; 2260 port->dev.parent = parent; 2261 port->dev.fwnode = cap->fwnode; 2262 port->dev.type = &typec_port_dev_type; 2263 dev_set_name(&port->dev, "port%d", id); 2264 dev_set_drvdata(&port->dev, cap->driver_data); 2265 2266 port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL); 2267 if (!port->cap) { 2268 put_device(&port->dev); 2269 return ERR_PTR(-ENOMEM); 2270 } 2271 2272 port->sw = typec_switch_get(&port->dev); 2273 if (IS_ERR(port->sw)) { 2274 ret = PTR_ERR(port->sw); 2275 put_device(&port->dev); 2276 return ERR_PTR(ret); 2277 } 2278 2279 port->mux = typec_mux_get(&port->dev); 2280 if (IS_ERR(port->mux)) { 2281 ret = PTR_ERR(port->mux); 2282 put_device(&port->dev); 2283 return ERR_PTR(ret); 2284 } 2285 2286 port->retimer = typec_retimer_get(&port->dev); 2287 if (IS_ERR(port->retimer)) { 2288 ret = PTR_ERR(port->retimer); 2289 put_device(&port->dev); 2290 return ERR_PTR(ret); 2291 } 2292 2293 port->pd = cap->pd; 2294 2295 ret = device_add(&port->dev); 2296 if (ret) { 2297 dev_err(parent, "failed to register port (%d)\n", ret); 2298 put_device(&port->dev); 2299 return ERR_PTR(ret); 2300 } 2301 2302 ret = usb_power_delivery_link_device(port->pd, &port->dev); 2303 if (ret) { 2304 dev_err(&port->dev, "failed to link pd\n"); 2305 device_unregister(&port->dev); 2306 return ERR_PTR(ret); 2307 } 2308 2309 ret = typec_link_ports(port); 2310 if (ret) 2311 dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret); 2312 2313 return port; 2314 } 2315 EXPORT_SYMBOL_GPL(typec_register_port); 2316 2317 /** 2318 * typec_unregister_port - Unregister a USB Type-C Port 2319 * @port: The port to be unregistered 2320 * 2321 * Unregister device created with typec_register_port(). 2322 */ 2323 void typec_unregister_port(struct typec_port *port) 2324 { 2325 if (!IS_ERR_OR_NULL(port)) { 2326 typec_unlink_ports(port); 2327 typec_port_set_usb_power_delivery(port, NULL); 2328 device_unregister(&port->dev); 2329 } 2330 } 2331 EXPORT_SYMBOL_GPL(typec_unregister_port); 2332 2333 static int __init typec_init(void) 2334 { 2335 int ret; 2336 2337 ret = bus_register(&typec_bus); 2338 if (ret) 2339 return ret; 2340 2341 ret = class_register(&typec_mux_class); 2342 if (ret) 2343 goto err_unregister_bus; 2344 2345 ret = class_register(&retimer_class); 2346 if (ret) 2347 goto err_unregister_mux_class; 2348 2349 ret = class_register(&typec_class); 2350 if (ret) 2351 goto err_unregister_retimer_class; 2352 2353 ret = usb_power_delivery_init(); 2354 if (ret) 2355 goto err_unregister_class; 2356 2357 return 0; 2358 2359 err_unregister_class: 2360 class_unregister(&typec_class); 2361 2362 err_unregister_retimer_class: 2363 class_unregister(&retimer_class); 2364 2365 err_unregister_mux_class: 2366 class_unregister(&typec_mux_class); 2367 2368 err_unregister_bus: 2369 bus_unregister(&typec_bus); 2370 2371 return ret; 2372 } 2373 subsys_initcall(typec_init); 2374 2375 static void __exit typec_exit(void) 2376 { 2377 usb_power_delivery_exit(); 2378 class_unregister(&typec_class); 2379 ida_destroy(&typec_index_ida); 2380 bus_unregister(&typec_bus); 2381 class_unregister(&typec_mux_class); 2382 class_unregister(&retimer_class); 2383 } 2384 module_exit(typec_exit); 2385 2386 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); 2387 MODULE_LICENSE("GPL v2"); 2388 MODULE_DESCRIPTION("USB Type-C Connector Class"); 2389