drivers/usb/core/port.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * usb port device code
   4  *
   5  * Copyright (C) 2012 Intel Corp
   6  *
   7  * Author: Lan Tianyu <tianyu.lan@intel.com>
   8  */
   9
  10 #include <linux/kstrtox.h>
  11 #include <linux/slab.h>
  12 #include <linux/pm_qos.h>
  13 #include <linux/component.h>
  14 #include <linux/usb/of.h>
  15
  16 #include "hub.h"
  17
  18 static int usb_port_block_power_off;
  19
  20 static const struct attribute_group *port_dev_group[];
  21
  22 static ssize_t early_stop_show(struct device *dev,
  23                             struct device_attribute *attr, char *buf)
  24 {
  25         struct usb_port *port_dev = to_usb_port(dev);
  26
  27         return sysfs_emit(buf, "%s\n", port_dev->early_stop ? "yes" : "no");
  28 }
  29
  30 static ssize_t early_stop_store(struct device *dev, struct device_attribute *attr,
  31                                 const char *buf, size_t count)
  32 {
  33         struct usb_port *port_dev = to_usb_port(dev);
  34         bool value;
  35
  36         if (kstrtobool(buf, &value))
  37                 return -EINVAL;
  38
  39         if (value)
  40                 port_dev->early_stop = 1;
  41         else
  42                 port_dev->early_stop = 0;
  43
  44         return count;
  45 }
  46 static DEVICE_ATTR_RW(early_stop);
  47
  48 static ssize_t disable_show(struct device *dev,
  49                               struct device_attribute *attr, char *buf)
  50 {
  51         struct usb_port *port_dev = to_usb_port(dev);
  52         struct usb_device *hdev = to_usb_device(dev->parent->parent);
  53         struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
  54         struct usb_interface *intf = to_usb_interface(hub->intfdev);
  55         int port1 = port_dev->portnum;
  56         u16 portstatus, unused;
  57         bool disabled;
  58         int rc;
  59
  60         rc = usb_autopm_get_interface(intf);
  61         if (rc < 0)
  62                 return rc;
  63
  64         usb_lock_device(hdev);
  65         if (hub->disconnected) {
  66                 rc = -ENODEV;
  67                 goto out_hdev_lock;
  68         }
  69
  70         usb_hub_port_status(hub, port1, &portstatus, &unused);
  71         disabled = !usb_port_is_power_on(hub, portstatus);
  72
  73 out_hdev_lock:
  74         usb_unlock_device(hdev);
  75         usb_autopm_put_interface(intf);
  76
  77         if (rc)
  78                 return rc;
  79
  80         return sysfs_emit(buf, "%s\n", disabled ? "1" : "0");
  81 }
  82
  83 static ssize_t disable_store(struct device *dev, struct device_attribute *attr,
  84                             const char *buf, size_t count)
  85 {
  86         struct usb_port *port_dev = to_usb_port(dev);
  87         struct usb_device *hdev = to_usb_device(dev->parent->parent);
  88         struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
  89         struct usb_interface *intf = to_usb_interface(hub->intfdev);
  90         int port1 = port_dev->portnum;
  91         bool disabled;
  92         int rc;
  93
  94         rc = kstrtobool(buf, &disabled);
  95         if (rc)
  96                 return rc;
  97
  98         rc = usb_autopm_get_interface(intf);
  99         if (rc < 0)
 100                 return rc;
 101
 102         usb_lock_device(hdev);
 103         if (hub->disconnected) {
 104                 rc = -ENODEV;
 105                 goto out_hdev_lock;
 106         }
 107
 108         if (disabled && port_dev->child)
 109                 usb_disconnect(&port_dev->child);
 110
 111         rc = usb_hub_set_port_power(hdev, hub, port1, !disabled);
 112
 113         if (disabled) {
 114                 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
 115                 if (!port_dev->is_superspeed)
 116                         usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
 117         }
 118
 119         if (!rc)
 120                 rc = count;
 121
 122 out_hdev_lock:
 123         usb_unlock_device(hdev);
 124         usb_autopm_put_interface(intf);
 125
 126         return rc;
 127 }
 128 static DEVICE_ATTR_RW(disable);
 129
 130 static ssize_t location_show(struct device *dev,
 131                              struct device_attribute *attr, char *buf)
 132 {
 133         struct usb_port *port_dev = to_usb_port(dev);
 134
 135         return sprintf(buf, "0x%08x\n", port_dev->location);
 136 }
 137 static DEVICE_ATTR_RO(location);
 138
 139 static ssize_t connect_type_show(struct device *dev,
 140                                  struct device_attribute *attr, char *buf)
 141 {
 142         struct usb_port *port_dev = to_usb_port(dev);
 143         char *result;
 144
 145         switch (port_dev->connect_type) {
 146         case USB_PORT_CONNECT_TYPE_HOT_PLUG:
 147                 result = "hotplug";
 148                 break;
 149         case USB_PORT_CONNECT_TYPE_HARD_WIRED:
 150                 result = "hardwired";
 151                 break;
 152         case USB_PORT_NOT_USED:
 153                 result = "not used";
 154                 break;
 155         default:
 156                 result = "unknown";
 157                 break;
 158         }
 159
 160         return sprintf(buf, "%s\n", result);
 161 }
 162 static DEVICE_ATTR_RO(connect_type);
 163
 164 static ssize_t state_show(struct device *dev,
 165                           struct device_attribute *attr, char *buf)
 166 {
 167         struct usb_port *port_dev = to_usb_port(dev);
 168         enum usb_device_state state = READ_ONCE(port_dev->state);
 169
 170         return sysfs_emit(buf, "%s\n", usb_state_string(state));
 171 }
 172 static DEVICE_ATTR_RO(state);
 173
 174 static ssize_t over_current_count_show(struct device *dev,
 175                                        struct device_attribute *attr, char *buf)
 176 {
 177         struct usb_port *port_dev = to_usb_port(dev);
 178
 179         return sprintf(buf, "%u\n", port_dev->over_current_count);
 180 }
 181 static DEVICE_ATTR_RO(over_current_count);
 182
 183 static ssize_t quirks_show(struct device *dev,
 184                            struct device_attribute *attr, char *buf)
 185 {
 186         struct usb_port *port_dev = to_usb_port(dev);
 187
 188         return sprintf(buf, "%08x\n", port_dev->quirks);
 189 }
 190
 191 static ssize_t quirks_store(struct device *dev, struct device_attribute *attr,
 192                             const char *buf, size_t count)
 193 {
 194         struct usb_port *port_dev = to_usb_port(dev);
 195         u32 value;
 196
 197         if (kstrtou32(buf, 16, &value))
 198                 return -EINVAL;
 199
 200         port_dev->quirks = value;
 201         return count;
 202 }
 203 static DEVICE_ATTR_RW(quirks);
 204
 205 static ssize_t usb3_lpm_permit_show(struct device *dev,
 206                               struct device_attribute *attr, char *buf)
 207 {
 208         struct usb_port *port_dev = to_usb_port(dev);
 209         const char *p;
 210
 211         if (port_dev->usb3_lpm_u1_permit) {
 212                 if (port_dev->usb3_lpm_u2_permit)
 213                         p = "u1_u2";
 214                 else
 215                         p = "u1";
 216         } else {
 217                 if (port_dev->usb3_lpm_u2_permit)
 218                         p = "u2";
 219                 else
 220                         p = "0";
 221         }
 222
 223         return sprintf(buf, "%s\n", p);
 224 }
 225
 226 static ssize_t usb3_lpm_permit_store(struct device *dev,
 227                                struct device_attribute *attr,
 228                                const char *buf, size_t count)
 229 {
 230         struct usb_port *port_dev = to_usb_port(dev);
 231         struct usb_device *udev = port_dev->child;
 232         struct usb_hcd *hcd;
 233
 234         if (!strncmp(buf, "u1_u2", 5)) {
 235                 port_dev->usb3_lpm_u1_permit = 1;
 236                 port_dev->usb3_lpm_u2_permit = 1;
 237
 238         } else if (!strncmp(buf, "u1", 2)) {
 239                 port_dev->usb3_lpm_u1_permit = 1;
 240                 port_dev->usb3_lpm_u2_permit = 0;
 241
 242         } else if (!strncmp(buf, "u2", 2)) {
 243                 port_dev->usb3_lpm_u1_permit = 0;
 244                 port_dev->usb3_lpm_u2_permit = 1;
 245
 246         } else if (!strncmp(buf, "0", 1)) {
 247                 port_dev->usb3_lpm_u1_permit = 0;
 248                 port_dev->usb3_lpm_u2_permit = 0;
 249         } else
 250                 return -EINVAL;
 251
 252         /* If device is connected to the port, disable or enable lpm
 253          * to make new u1 u2 setting take effect immediately.
 254          */
 255         if (udev) {
 256                 hcd = bus_to_hcd(udev->bus);
 257                 if (!hcd)
 258                         return -EINVAL;
 259                 usb_lock_device(udev);
 260                 mutex_lock(hcd->bandwidth_mutex);
 261                 if (!usb_disable_lpm(udev))
 262                         usb_enable_lpm(udev);
 263                 mutex_unlock(hcd->bandwidth_mutex);
 264                 usb_unlock_device(udev);
 265         }
 266
 267         return count;
 268 }
 269 static DEVICE_ATTR_RW(usb3_lpm_permit);
 270
 271 static struct attribute *port_dev_attrs[] = {
 272         &dev_attr_connect_type.attr,
 273         &dev_attr_state.attr,
 274         &dev_attr_location.attr,
 275         &dev_attr_quirks.attr,
 276         &dev_attr_over_current_count.attr,
 277         &dev_attr_disable.attr,
 278         &dev_attr_early_stop.attr,
 279         NULL,
 280 };
 281
 282 static const struct attribute_group port_dev_attr_grp = {
 283         .attrs = port_dev_attrs,
 284 };
 285
 286 static const struct attribute_group *port_dev_group[] = {
 287         &port_dev_attr_grp,
 288         NULL,
 289 };
 290
 291 static struct attribute *port_dev_usb3_attrs[] = {
 292         &dev_attr_usb3_lpm_permit.attr,
 293         NULL,
 294 };
 295
 296 static const struct attribute_group port_dev_usb3_attr_grp = {
 297         .attrs = port_dev_usb3_attrs,
 298 };
 299
 300 static const struct attribute_group *port_dev_usb3_group[] = {
 301         &port_dev_attr_grp,
 302         &port_dev_usb3_attr_grp,
 303         NULL,
 304 };
 305
 306 static void usb_port_device_release(struct device *dev)
 307 {
 308         struct usb_port *port_dev = to_usb_port(dev);
 309
 310         kfree(port_dev->req);
 311         kfree(port_dev);
 312 }
 313
 314 #ifdef CONFIG_PM
 315 static int usb_port_runtime_resume(struct device *dev)
 316 {
 317         struct usb_port *port_dev = to_usb_port(dev);
 318         struct usb_device *hdev = to_usb_device(dev->parent->parent);
 319         struct usb_interface *intf = to_usb_interface(dev->parent);
 320         struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
 321         struct usb_device *udev = port_dev->child;
 322         struct usb_port *peer = port_dev->peer;
 323         int port1 = port_dev->portnum;
 324         int retval;
 325
 326         if (!hub)
 327                 return -EINVAL;
 328         if (hub->in_reset) {
 329                 set_bit(port1, hub->power_bits);
 330                 return 0;
 331         }
 332
 333         /*
 334          * Power on our usb3 peer before this usb2 port to prevent a usb3
 335          * device from degrading to its usb2 connection
 336          */
 337         if (!port_dev->is_superspeed && peer)
 338                 pm_runtime_get_sync(&peer->dev);
 339
 340         retval = usb_autopm_get_interface(intf);
 341         if (retval < 0)
 342                 return retval;
 343
 344         retval = usb_hub_set_port_power(hdev, hub, port1, true);
 345         msleep(hub_power_on_good_delay(hub));
 346         if (udev && !retval) {
 347                 /*
 348                  * Our preference is to simply wait for the port to reconnect,
 349                  * as that is the lowest latency method to restart the port.
 350                  * However, there are cases where toggling port power results in
 351                  * the host port and the device port getting out of sync causing
 352                  * a link training live lock.  Upon timeout, flag the port as
 353                  * needing warm reset recovery (to be performed later by
 354                  * usb_port_resume() as requested via usb_wakeup_notification())
 355                  */
 356                 if (hub_port_debounce_be_connected(hub, port1) < 0) {
 357                         dev_dbg(&port_dev->dev, "reconnect timeout\n");
 358                         if (hub_is_superspeed(hdev))
 359                                 set_bit(port1, hub->warm_reset_bits);
 360                 }
 361
 362                 /* Force the child awake to revalidate after the power loss. */
 363                 if (!test_and_set_bit(port1, hub->child_usage_bits)) {
 364                         pm_runtime_get_noresume(&port_dev->dev);
 365                         pm_request_resume(&udev->dev);
 366                 }
 367         }
 368
 369         usb_autopm_put_interface(intf);
 370
 371         return retval;
 372 }
 373
 374 static int usb_port_runtime_suspend(struct device *dev)
 375 {
 376         struct usb_port *port_dev = to_usb_port(dev);
 377         struct usb_device *hdev = to_usb_device(dev->parent->parent);
 378         struct usb_interface *intf = to_usb_interface(dev->parent);
 379         struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
 380         struct usb_port *peer = port_dev->peer;
 381         int port1 = port_dev->portnum;
 382         int retval;
 383
 384         if (!hub)
 385                 return -EINVAL;
 386         if (hub->in_reset)
 387                 return -EBUSY;
 388
 389         if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
 390                         == PM_QOS_FLAGS_ALL)
 391                 return -EAGAIN;
 392
 393         if (usb_port_block_power_off)
 394                 return -EBUSY;
 395
 396         retval = usb_autopm_get_interface(intf);
 397         if (retval < 0)
 398                 return retval;
 399
 400         retval = usb_hub_set_port_power(hdev, hub, port1, false);
 401         usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
 402         if (!port_dev->is_superspeed)
 403                 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
 404         usb_autopm_put_interface(intf);
 405
 406         /*
 407          * Our peer usb3 port may now be able to suspend, so
 408          * asynchronously queue a suspend request to observe that this
 409          * usb2 port is now off.
 410          */
 411         if (!port_dev->is_superspeed && peer)
 412                 pm_runtime_put(&peer->dev);
 413
 414         return retval;
 415 }
 416 #endif
 417
 418 static void usb_port_shutdown(struct device *dev)
 419 {
 420         struct usb_port *port_dev = to_usb_port(dev);
 421
 422         if (port_dev->child)
 423                 usb_disable_usb2_hardware_lpm(port_dev->child);
 424 }
 425
 426 static const struct dev_pm_ops usb_port_pm_ops = {
 427 #ifdef CONFIG_PM
 428         .runtime_suspend =      usb_port_runtime_suspend,
 429         .runtime_resume =       usb_port_runtime_resume,
 430 #endif
 431 };
 432
 433 const struct device_type usb_port_device_type = {
 434         .name =         "usb_port",
 435         .release =      usb_port_device_release,
 436         .pm =           &usb_port_pm_ops,
 437 };
 438
 439 static struct device_driver usb_port_driver = {
 440         .name = "usb",
 441         .owner = THIS_MODULE,
 442         .shutdown = usb_port_shutdown,
 443 };
 444
 445 static int link_peers(struct usb_port *left, struct usb_port *right)
 446 {
 447         struct usb_port *ss_port, *hs_port;
 448         int rc;
 449
 450         if (left->peer == right && right->peer == left)
 451                 return 0;
 452
 453         if (left->peer || right->peer) {
 454                 struct usb_port *lpeer = left->peer;
 455                 struct usb_port *rpeer = right->peer;
 456                 char *method;
 457
 458                 if (left->location && left->location == right->location)
 459                         method = "location";
 460                 else
 461                         method = "default";
 462
 463                 pr_debug("usb: failed to peer %s and %s by %s (%s:%s) (%s:%s)\n",
 464                         dev_name(&left->dev), dev_name(&right->dev), method,
 465                         dev_name(&left->dev),
 466                         lpeer ? dev_name(&lpeer->dev) : "none",
 467                         dev_name(&right->dev),
 468                         rpeer ? dev_name(&rpeer->dev) : "none");
 469                 return -EBUSY;
 470         }
 471
 472         rc = sysfs_create_link(&left->dev.kobj, &right->dev.kobj, "peer");
 473         if (rc)
 474                 return rc;
 475         rc = sysfs_create_link(&right->dev.kobj, &left->dev.kobj, "peer");
 476         if (rc) {
 477                 sysfs_remove_link(&left->dev.kobj, "peer");
 478                 return rc;
 479         }
 480
 481         /*
 482          * We need to wake the HiSpeed port to make sure we don't race
 483          * setting ->peer with usb_port_runtime_suspend().  Otherwise we
 484          * may miss a suspend event for the SuperSpeed port.
 485          */
 486         if (left->is_superspeed) {
 487                 ss_port = left;
 488                 WARN_ON(right->is_superspeed);
 489                 hs_port = right;
 490         } else {
 491                 ss_port = right;
 492                 WARN_ON(!right->is_superspeed);
 493                 hs_port = left;
 494         }
 495         pm_runtime_get_sync(&hs_port->dev);
 496
 497         left->peer = right;
 498         right->peer = left;
 499
 500         /*
 501          * The SuperSpeed reference is dropped when the HiSpeed port in
 502          * this relationship suspends, i.e. when it is safe to allow a
 503          * SuperSpeed connection to drop since there is no risk of a
 504          * device degrading to its powered-off HiSpeed connection.
 505          *
 506          * Also, drop the HiSpeed ref taken above.
 507          */
 508         pm_runtime_get_sync(&ss_port->dev);
 509         pm_runtime_put(&hs_port->dev);
 510
 511         return 0;
 512 }
 513
 514 static void link_peers_report(struct usb_port *left, struct usb_port *right)
 515 {
 516         int rc;
 517
 518         rc = link_peers(left, right);
 519         if (rc == 0) {
 520                 dev_dbg(&left->dev, "peered to %s\n", dev_name(&right->dev));
 521         } else {
 522                 dev_dbg(&left->dev, "failed to peer to %s (%d)\n",
 523                                 dev_name(&right->dev), rc);
 524                 pr_warn_once("usb: port power management may be unreliable\n");
 525                 usb_port_block_power_off = 1;
 526         }
 527 }
 528
 529 static void unlink_peers(struct usb_port *left, struct usb_port *right)
 530 {
 531         struct usb_port *ss_port, *hs_port;
 532
 533         WARN(right->peer != left || left->peer != right,
 534                         "%s and %s are not peers?\n",
 535                         dev_name(&left->dev), dev_name(&right->dev));
 536
 537         /*
 538          * We wake the HiSpeed port to make sure we don't race its
 539          * usb_port_runtime_resume() event which takes a SuperSpeed ref
 540          * when ->peer is !NULL.
 541          */
 542         if (left->is_superspeed) {
 543                 ss_port = left;
 544                 hs_port = right;
 545         } else {
 546                 ss_port = right;
 547                 hs_port = left;
 548         }
 549
 550         pm_runtime_get_sync(&hs_port->dev);
 551
 552         sysfs_remove_link(&left->dev.kobj, "peer");
 553         right->peer = NULL;
 554         sysfs_remove_link(&right->dev.kobj, "peer");
 555         left->peer = NULL;
 556
 557         /* Drop the SuperSpeed ref held on behalf of the active HiSpeed port */
 558         pm_runtime_put(&ss_port->dev);
 559
 560         /* Drop the ref taken above */
 561         pm_runtime_put(&hs_port->dev);
 562 }
 563
 564 /*
 565  * For each usb hub device in the system check to see if it is in the
 566  * peer domain of the given port_dev, and if it is check to see if it
 567  * has a port that matches the given port by location
 568  */
 569 static int match_location(struct usb_device *peer_hdev, void *p)
 570 {
 571         int port1;
 572         struct usb_hcd *hcd, *peer_hcd;
 573         struct usb_port *port_dev = p, *peer;
 574         struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev);
 575         struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent);
 576
 577         if (!peer_hub || port_dev->connect_type == USB_PORT_NOT_USED)
 578                 return 0;
 579
 580         hcd = bus_to_hcd(hdev->bus);
 581         peer_hcd = bus_to_hcd(peer_hdev->bus);
 582         /* peer_hcd is provisional until we verify it against the known peer */
 583         if (peer_hcd != hcd->shared_hcd)
 584                 return 0;
 585
 586         for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) {
 587                 peer = peer_hub->ports[port1 - 1];
 588                 if (peer && peer->connect_type != USB_PORT_NOT_USED &&
 589                     peer->location == port_dev->location) {
 590                         link_peers_report(port_dev, peer);
 591                         return 1; /* done */
 592                 }
 593         }
 594
 595         return 0;
 596 }
 597
 598 /*
 599  * Find the peer port either via explicit platform firmware "location"
 600  * data, the peer hcd for root hubs, or the upstream peer relationship
 601  * for all other hubs.
 602  */
 603 static void find_and_link_peer(struct usb_hub *hub, int port1)
 604 {
 605         struct usb_port *port_dev = hub->ports[port1 - 1], *peer;
 606         struct usb_device *hdev = hub->hdev;
 607         struct usb_device *peer_hdev;
 608         struct usb_hub *peer_hub;
 609
 610         /*
 611          * If location data is available then we can only peer this port
 612          * by a location match, not the default peer (lest we create a
 613          * situation where we need to go back and undo a default peering
 614          * when the port is later peered by location data)
 615          */
 616         if (port_dev->location) {
 617                 /* we link the peer in match_location() if found */
 618                 usb_for_each_dev(port_dev, match_location);
 619                 return;
 620         } else if (!hdev->parent) {
 621                 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
 622                 struct usb_hcd *peer_hcd = hcd->shared_hcd;
 623
 624                 if (!peer_hcd)
 625                         return;
 626
 627                 peer_hdev = peer_hcd->self.root_hub;
 628         } else {
 629                 struct usb_port *upstream;
 630                 struct usb_device *parent = hdev->parent;
 631                 struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent);
 632
 633                 if (!parent_hub)
 634                         return;
 635
 636                 upstream = parent_hub->ports[hdev->portnum - 1];
 637                 if (!upstream || !upstream->peer)
 638                         return;
 639
 640                 peer_hdev = upstream->peer->child;
 641         }
 642
 643         peer_hub = usb_hub_to_struct_hub(peer_hdev);
 644         if (!peer_hub || port1 > peer_hdev->maxchild)
 645                 return;
 646
 647         /*
 648          * we found a valid default peer, last check is to make sure it
 649          * does not have location data
 650          */
 651         peer = peer_hub->ports[port1 - 1];
 652         if (peer && peer->location == 0)
 653                 link_peers_report(port_dev, peer);
 654 }
 655
 656 static int connector_bind(struct device *dev, struct device *connector, void *data)
 657 {
 658         struct usb_port *port_dev = to_usb_port(dev);
 659         int ret;
 660
 661         ret = sysfs_create_link(&dev->kobj, &connector->kobj, "connector");
 662         if (ret)
 663                 return ret;
 664
 665         ret = sysfs_create_link(&connector->kobj, &dev->kobj, dev_name(dev));
 666         if (ret) {
 667                 sysfs_remove_link(&dev->kobj, "connector");
 668                 return ret;
 669         }
 670
 671         port_dev->connector = data;
 672
 673         /*
 674          * If there is already USB device connected to the port, letting the
 675          * Type-C connector know about it immediately.
 676          */
 677         if (port_dev->child)
 678                 typec_attach(port_dev->connector, &port_dev->child->dev);
 679
 680         return 0;
 681 }
 682
 683 static void connector_unbind(struct device *dev, struct device *connector, void *data)
 684 {
 685         struct usb_port *port_dev = to_usb_port(dev);
 686
 687         sysfs_remove_link(&connector->kobj, dev_name(dev));
 688         sysfs_remove_link(&dev->kobj, "connector");
 689         port_dev->connector = NULL;
 690 }
 691
 692 static const struct component_ops connector_ops = {
 693         .bind = connector_bind,
 694         .unbind = connector_unbind,
 695 };
 696
 697 int usb_hub_create_port_device(struct usb_hub *hub, int port1)
 698 {
 699         struct usb_port *port_dev;
 700         struct usb_device *hdev = hub->hdev;
 701         int retval;
 702
 703         port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
 704         if (!port_dev)
 705                 return -ENOMEM;
 706
 707         port_dev->req = kzalloc(sizeof(*(port_dev->req)), GFP_KERNEL);
 708         if (!port_dev->req) {
 709                 kfree(port_dev);
 710                 return -ENOMEM;
 711         }
 712
 713         port_dev->connect_type = usb_of_get_connect_type(hdev, port1);
 714         hub->ports[port1 - 1] = port_dev;
 715         port_dev->portnum = port1;
 716         set_bit(port1, hub->power_bits);
 717         port_dev->dev.parent = hub->intfdev;
 718         if (hub_is_superspeed(hdev)) {
 719                 port_dev->is_superspeed = 1;
 720                 port_dev->usb3_lpm_u1_permit = 1;
 721                 port_dev->usb3_lpm_u2_permit = 1;
 722                 port_dev->dev.groups = port_dev_usb3_group;
 723         } else
 724                 port_dev->dev.groups = port_dev_group;
 725         port_dev->dev.type = &usb_port_device_type;
 726         port_dev->dev.driver = &usb_port_driver;
 727         dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev),
 728                         port1);
 729         mutex_init(&port_dev->status_lock);
 730         retval = device_register(&port_dev->dev);
 731         if (retval) {
 732                 put_device(&port_dev->dev);
 733                 return retval;
 734         }
 735
 736         port_dev->state_kn = sysfs_get_dirent(port_dev->dev.kobj.sd, "state");
 737         if (!port_dev->state_kn) {
 738                 dev_err(&port_dev->dev, "failed to sysfs_get_dirent 'state'\n");
 739                 retval = -ENODEV;
 740                 goto err_unregister;
 741         }
 742
 743         /* Set default policy of port-poweroff disabled. */
 744         retval = dev_pm_qos_add_request(&port_dev->dev, port_dev->req,
 745                         DEV_PM_QOS_FLAGS, PM_QOS_FLAG_NO_POWER_OFF);
 746         if (retval < 0) {
 747                 goto err_put_kn;
 748         }
 749
 750         retval = component_add(&port_dev->dev, &connector_ops);
 751         if (retval) {
 752                 dev_warn(&port_dev->dev, "failed to add component\n");
 753                 goto err_put_kn;
 754         }
 755
 756         find_and_link_peer(hub, port1);
 757
 758         /*
 759          * Enable runtime pm and hold a refernce that hub_configure()
 760          * will drop once the PM_QOS_NO_POWER_OFF flag state has been set
 761          * and the hub has been fully registered (hdev->maxchild set).
 762          */
 763         pm_runtime_set_active(&port_dev->dev);
 764         pm_runtime_get_noresume(&port_dev->dev);
 765         pm_runtime_enable(&port_dev->dev);
 766         device_enable_async_suspend(&port_dev->dev);
 767
 768         /*
 769          * Keep hidden the ability to enable port-poweroff if the hub
 770          * does not support power switching.
 771          */
 772         if (!hub_is_port_power_switchable(hub))
 773                 return 0;
 774
 775         /* Attempt to let userspace take over the policy. */
 776         retval = dev_pm_qos_expose_flags(&port_dev->dev,
 777                         PM_QOS_FLAG_NO_POWER_OFF);
 778         if (retval < 0) {
 779                 dev_warn(&port_dev->dev, "failed to expose pm_qos_no_poweroff\n");
 780                 return 0;
 781         }
 782
 783         /* Userspace owns the policy, drop the kernel 'no_poweroff' request. */
 784         retval = dev_pm_qos_remove_request(port_dev->req);
 785         if (retval >= 0) {
 786                 kfree(port_dev->req);
 787                 port_dev->req = NULL;
 788         }
 789         return 0;
 790
 791 err_put_kn:
 792         sysfs_put(port_dev->state_kn);
 793 err_unregister:
 794         device_unregister(&port_dev->dev);
 795
 796         return retval;
 797 }
 798
 799 void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
 800 {
 801         struct usb_port *port_dev = hub->ports[port1 - 1];
 802         struct usb_port *peer;
 803
 804         peer = port_dev->peer;
 805         if (peer)
 806                 unlink_peers(port_dev, peer);
 807         component_del(&port_dev->dev, &connector_ops);
 808         sysfs_put(port_dev->state_kn);
 809         device_unregister(&port_dev->dev);
 810 }