git.oblomov.eu Git - linux-2.6/blob - drivers/usb/core/driver.c

   1 /*
   2  * drivers/usb/driver.c - most of the driver model stuff for usb
   3  *
   4  * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
   5  *
   6  * based on drivers/usb/usb.c which had the following copyrights:
   7  *      (C) Copyright Linus Torvalds 1999
   8  *      (C) Copyright Johannes Erdfelt 1999-2001
   9  *      (C) Copyright Andreas Gal 1999
  10  *      (C) Copyright Gregory P. Smith 1999
  11  *      (C) Copyright Deti Fliegl 1999 (new USB architecture)
  12  *      (C) Copyright Randy Dunlap 2000
  13  *      (C) Copyright David Brownell 2000-2004
  14  *      (C) Copyright Yggdrasil Computing, Inc. 2000
  15  *              (usb_device_id matching changes by Adam J. Richter)
  16  *      (C) Copyright Greg Kroah-Hartman 2002-2003
  17  *
  18  * NOTE! This is not actually a driver at all, rather this is
  19  * just a collection of helper routines that implement the
  20  * matching, probing, releasing, suspending and resuming for
  21  * real drivers.
  22  *
  23  */
  24
  25 #include <linux/device.h>
  26 #include <linux/usb.h>
  27 #include "hcd.h"
  28 #include "usb.h"
  29
  30 static int usb_match_one_id(struct usb_interface *interface,
  31                             const struct usb_device_id *id);
  32
  33 struct usb_dynid {
  34         struct list_head node;
  35         struct usb_device_id id;
  36 };
  37
  38 #ifdef CONFIG_HOTPLUG
  39
  40 /*
  41  * Adds a new dynamic USBdevice ID to this driver,
  42  * and cause the driver to probe for all devices again.
  43  */
  44 static ssize_t store_new_id(struct device_driver *driver,
  45                             const char *buf, size_t count)
  46 {
  47         struct usb_driver *usb_drv = to_usb_driver(driver);
  48         struct usb_dynid *dynid;
  49         u32 idVendor = 0;
  50         u32 idProduct = 0;
  51         int fields = 0;
  52
  53         fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
  54         if (fields < 2)
  55                 return -EINVAL;
  56
  57         dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
  58         if (!dynid)
  59                 return -ENOMEM;
  60
  61         INIT_LIST_HEAD(&dynid->node);
  62         dynid->id.idVendor = idVendor;
  63         dynid->id.idProduct = idProduct;
  64         dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
  65
  66         spin_lock(&usb_drv->dynids.lock);
  67         list_add_tail(&usb_drv->dynids.list, &dynid->node);
  68         spin_unlock(&usb_drv->dynids.lock);
  69
  70         if (get_driver(driver)) {
  71                 driver_attach(driver);
  72                 put_driver(driver);
  73         }
  74
  75         return count;
  76 }
  77 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
  78
  79 static int usb_create_newid_file(struct usb_driver *usb_drv)
  80 {
  81         int error = 0;
  82
  83         if (usb_drv->no_dynamic_id)
  84                 goto exit;
  85
  86         if (usb_drv->probe != NULL)
  87                 error = sysfs_create_file(&usb_drv->drvwrap.driver.kobj,
  88                                           &driver_attr_new_id.attr);
  89 exit:
  90         return error;
  91 }
  92
  93 static void usb_remove_newid_file(struct usb_driver *usb_drv)
  94 {
  95         if (usb_drv->no_dynamic_id)
  96                 return;
  97
  98         if (usb_drv->probe != NULL)
  99                 sysfs_remove_file(&usb_drv->drvwrap.driver.kobj,
 100                                   &driver_attr_new_id.attr);
 101 }
 102
 103 static void usb_free_dynids(struct usb_driver *usb_drv)
 104 {
 105         struct usb_dynid *dynid, *n;
 106
 107         spin_lock(&usb_drv->dynids.lock);
 108         list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
 109                 list_del(&dynid->node);
 110                 kfree(dynid);
 111         }
 112         spin_unlock(&usb_drv->dynids.lock);
 113 }
 114 #else
 115 static inline int usb_create_newid_file(struct usb_driver *usb_drv)
 116 {
 117         return 0;
 118 }
 119
 120 static void usb_remove_newid_file(struct usb_driver *usb_drv)
 121 {
 122 }
 123
 124 static inline void usb_free_dynids(struct usb_driver *usb_drv)
 125 {
 126 }
 127 #endif
 128
 129 static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
 130                                                         struct usb_driver *drv)
 131 {
 132         struct usb_dynid *dynid;
 133
 134         spin_lock(&drv->dynids.lock);
 135         list_for_each_entry(dynid, &drv->dynids.list, node) {
 136                 if (usb_match_one_id(intf, &dynid->id)) {
 137                         spin_unlock(&drv->dynids.lock);
 138                         return &dynid->id;
 139                 }
 140         }
 141         spin_unlock(&drv->dynids.lock);
 142         return NULL;
 143 }
 144
 145
 146 /* called from driver core with dev locked */
 147 static int usb_probe_device(struct device *dev)
 148 {
 149         struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
 150         struct usb_device *udev;
 151         int error = -ENODEV;
 152
 153         dev_dbg(dev, "%s\n", __FUNCTION__);
 154
 155         if (!is_usb_device(dev))        /* Sanity check */
 156                 return error;
 157
 158         udev = to_usb_device(dev);
 159
 160         /* FIXME: resume a suspended device */
 161         if (udev->state == USB_STATE_SUSPENDED)
 162                 return -EHOSTUNREACH;
 163
 164         /* TODO: Add real matching code */
 165
 166         error = udriver->probe(udev);
 167         return error;
 168 }
 169
 170 /* called from driver core with dev locked */
 171 static int usb_unbind_device(struct device *dev)
 172 {
 173         struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
 174
 175         udriver->disconnect(to_usb_device(dev));
 176         return 0;
 177 }
 178
 179
 180 /* called from driver core with dev locked */
 181 static int usb_probe_interface(struct device *dev)
 182 {
 183         struct usb_driver *driver = to_usb_driver(dev->driver);
 184         struct usb_interface *intf;
 185         const struct usb_device_id *id;
 186         int error = -ENODEV;
 187
 188         dev_dbg(dev, "%s\n", __FUNCTION__);
 189
 190         if (is_usb_device(dev))         /* Sanity check */
 191                 return error;
 192
 193         intf = to_usb_interface(dev);
 194
 195         /* FIXME we'd much prefer to just resume it ... */
 196         if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED)
 197                 return -EHOSTUNREACH;
 198
 199         id = usb_match_id(intf, driver->id_table);
 200         if (!id)
 201                 id = usb_match_dynamic_id(intf, driver);
 202         if (id) {
 203                 dev_dbg(dev, "%s - got id\n", __FUNCTION__);
 204
 205                 /* Interface "power state" doesn't correspond to any hardware
 206                  * state whatsoever.  We use it to record when it's bound to
 207                  * a driver that may start I/0:  it's not frozen/quiesced.
 208                  */
 209                 mark_active(intf);
 210                 intf->condition = USB_INTERFACE_BINDING;
 211                 error = driver->probe(intf, id);
 212                 if (error) {
 213                         mark_quiesced(intf);
 214                         intf->condition = USB_INTERFACE_UNBOUND;
 215                 } else
 216                         intf->condition = USB_INTERFACE_BOUND;
 217         }
 218
 219         return error;
 220 }
 221
 222 /* called from driver core with dev locked */
 223 static int usb_unbind_interface(struct device *dev)
 224 {
 225         struct usb_driver *driver = to_usb_driver(dev->driver);
 226         struct usb_interface *intf = to_usb_interface(dev);
 227
 228         intf->condition = USB_INTERFACE_UNBINDING;
 229
 230         /* release all urbs for this interface */
 231         usb_disable_interface(interface_to_usbdev(intf), intf);
 232
 233         driver->disconnect(intf);
 234
 235         /* reset other interface state */
 236         usb_set_interface(interface_to_usbdev(intf),
 237                         intf->altsetting[0].desc.bInterfaceNumber,
 238                         0);
 239         usb_set_intfdata(intf, NULL);
 240         intf->condition = USB_INTERFACE_UNBOUND;
 241         mark_quiesced(intf);
 242
 243         return 0;
 244 }
 245
 246 /**
 247  * usb_driver_claim_interface - bind a driver to an interface
 248  * @driver: the driver to be bound
 249  * @iface: the interface to which it will be bound; must be in the
 250  *      usb device's active configuration
 251  * @priv: driver data associated with that interface
 252  *
 253  * This is used by usb device drivers that need to claim more than one
 254  * interface on a device when probing (audio and acm are current examples).
 255  * No device driver should directly modify internal usb_interface or
 256  * usb_device structure members.
 257  *
 258  * Few drivers should need to use this routine, since the most natural
 259  * way to bind to an interface is to return the private data from
 260  * the driver's probe() method.
 261  *
 262  * Callers must own the device lock and the driver model's usb_bus_type.subsys
 263  * writelock.  So driver probe() entries don't need extra locking,
 264  * but other call contexts may need to explicitly claim those locks.
 265  */
 266 int usb_driver_claim_interface(struct usb_driver *driver,
 267                                 struct usb_interface *iface, void* priv)
 268 {
 269         struct device *dev = &iface->dev;
 270
 271         if (dev->driver)
 272                 return -EBUSY;
 273
 274         dev->driver = &driver->drvwrap.driver;
 275         usb_set_intfdata(iface, priv);
 276         iface->condition = USB_INTERFACE_BOUND;
 277         mark_active(iface);
 278
 279         /* if interface was already added, bind now; else let
 280          * the future device_add() bind it, bypassing probe()
 281          */
 282         if (device_is_registered(dev))
 283                 device_bind_driver(dev);
 284
 285         return 0;
 286 }
 287 EXPORT_SYMBOL(usb_driver_claim_interface);
 288
 289 /**
 290  * usb_driver_release_interface - unbind a driver from an interface
 291  * @driver: the driver to be unbound
 292  * @iface: the interface from which it will be unbound
 293  *
 294  * This can be used by drivers to release an interface without waiting
 295  * for their disconnect() methods to be called.  In typical cases this
 296  * also causes the driver disconnect() method to be called.
 297  *
 298  * This call is synchronous, and may not be used in an interrupt context.
 299  * Callers must own the device lock and the driver model's usb_bus_type.subsys
 300  * writelock.  So driver disconnect() entries don't need extra locking,
 301  * but other call contexts may need to explicitly claim those locks.
 302  */
 303 void usb_driver_release_interface(struct usb_driver *driver,
 304                                         struct usb_interface *iface)
 305 {
 306         struct device *dev = &iface->dev;
 307
 308         /* this should never happen, don't release something that's not ours */
 309         if (!dev->driver || dev->driver != &driver->drvwrap.driver)
 310                 return;
 311
 312         /* don't release from within disconnect() */
 313         if (iface->condition != USB_INTERFACE_BOUND)
 314                 return;
 315
 316         /* don't release if the interface hasn't been added yet */
 317         if (device_is_registered(dev)) {
 318                 iface->condition = USB_INTERFACE_UNBINDING;
 319                 device_release_driver(dev);
 320         }
 321
 322         dev->driver = NULL;
 323         usb_set_intfdata(iface, NULL);
 324         iface->condition = USB_INTERFACE_UNBOUND;
 325         mark_quiesced(iface);
 326 }
 327 EXPORT_SYMBOL(usb_driver_release_interface);
 328
 329 /* returns 0 if no match, 1 if match */
 330 static int usb_match_one_id(struct usb_interface *interface,
 331                             const struct usb_device_id *id)
 332 {
 333         struct usb_host_interface *intf;
 334         struct usb_device *dev;
 335
 336         /* proc_connectinfo in devio.c may call us with id == NULL. */
 337         if (id == NULL)
 338                 return 0;
 339
 340         intf = interface->cur_altsetting;
 341         dev = interface_to_usbdev(interface);
 342
 343         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 344             id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
 345                 return 0;
 346
 347         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 348             id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
 349                 return 0;
 350
 351         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 352            greater than any unsigned number. */
 353         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 354             (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
 355                 return 0;
 356
 357         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 358             (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
 359                 return 0;
 360
 361         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 362             (id->bDeviceClass != dev->descriptor.bDeviceClass))
 363                 return 0;
 364
 365         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 366             (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass))
 367                 return 0;
 368
 369         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 370             (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
 371                 return 0;
 372
 373         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 374             (id->bInterfaceClass != intf->desc.bInterfaceClass))
 375                 return 0;
 376
 377         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 378             (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass))
 379                 return 0;
 380
 381         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 382             (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol))
 383                 return 0;
 384
 385         return 1;
 386 }
 387 /**
 388  * usb_match_id - find first usb_device_id matching device or interface
 389  * @interface: the interface of interest
 390  * @id: array of usb_device_id structures, terminated by zero entry
 391  *
 392  * usb_match_id searches an array of usb_device_id's and returns
 393  * the first one matching the device or interface, or null.
 394  * This is used when binding (or rebinding) a driver to an interface.
 395  * Most USB device drivers will use this indirectly, through the usb core,
 396  * but some layered driver frameworks use it directly.
 397  * These device tables are exported with MODULE_DEVICE_TABLE, through
 398  * modutils, to support the driver loading functionality of USB hotplugging.
 399  *
 400  * What Matches:
 401  *
 402  * The "match_flags" element in a usb_device_id controls which
 403  * members are used.  If the corresponding bit is set, the
 404  * value in the device_id must match its corresponding member
 405  * in the device or interface descriptor, or else the device_id
 406  * does not match.
 407  *
 408  * "driver_info" is normally used only by device drivers,
 409  * but you can create a wildcard "matches anything" usb_device_id
 410  * as a driver's "modules.usbmap" entry if you provide an id with
 411  * only a nonzero "driver_info" field.  If you do this, the USB device
 412  * driver's probe() routine should use additional intelligence to
 413  * decide whether to bind to the specified interface.
 414  *
 415  * What Makes Good usb_device_id Tables:
 416  *
 417  * The match algorithm is very simple, so that intelligence in
 418  * driver selection must come from smart driver id records.
 419  * Unless you have good reasons to use another selection policy,
 420  * provide match elements only in related groups, and order match
 421  * specifiers from specific to general.  Use the macros provided
 422  * for that purpose if you can.
 423  *
 424  * The most specific match specifiers use device descriptor
 425  * data.  These are commonly used with product-specific matches;
 426  * the USB_DEVICE macro lets you provide vendor and product IDs,
 427  * and you can also match against ranges of product revisions.
 428  * These are widely used for devices with application or vendor
 429  * specific bDeviceClass values.
 430  *
 431  * Matches based on device class/subclass/protocol specifications
 432  * are slightly more general; use the USB_DEVICE_INFO macro, or
 433  * its siblings.  These are used with single-function devices
 434  * where bDeviceClass doesn't specify that each interface has
 435  * its own class.
 436  *
 437  * Matches based on interface class/subclass/protocol are the
 438  * most general; they let drivers bind to any interface on a
 439  * multiple-function device.  Use the USB_INTERFACE_INFO
 440  * macro, or its siblings, to match class-per-interface style
 441  * devices (as recorded in bDeviceClass).
 442  *
 443  * Within those groups, remember that not all combinations are
 444  * meaningful.  For example, don't give a product version range
 445  * without vendor and product IDs; or specify a protocol without
 446  * its associated class and subclass.
 447  */
 448 const struct usb_device_id *usb_match_id(struct usb_interface *interface,
 449                                          const struct usb_device_id *id)
 450 {
 451         /* proc_connectinfo in devio.c may call us with id == NULL. */
 452         if (id == NULL)
 453                 return NULL;
 454
 455         /* It is important to check that id->driver_info is nonzero,
 456            since an entry that is all zeroes except for a nonzero
 457            id->driver_info is the way to create an entry that
 458            indicates that the driver want to examine every
 459            device and interface. */
 460         for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
 461                id->driver_info; id++) {
 462                 if (usb_match_one_id(interface, id))
 463                         return id;
 464         }
 465
 466         return NULL;
 467 }
 468 EXPORT_SYMBOL_GPL_FUTURE(usb_match_id);
 469
 470 int usb_device_match(struct device *dev, struct device_driver *drv)
 471 {
 472         /* devices and interfaces are handled separately */
 473         if (is_usb_device(dev)) {
 474
 475                 /* interface drivers never match devices */
 476                 if (!is_usb_device_driver(drv))
 477                         return 0;
 478
 479                 /* TODO: Add real matching code */
 480                 return 1;
 481
 482         } else {
 483                 struct usb_interface *intf;
 484                 struct usb_driver *usb_drv;
 485                 const struct usb_device_id *id;
 486
 487                 /* device drivers never match interfaces */
 488                 if (is_usb_device_driver(drv))
 489                         return 0;
 490
 491                 intf = to_usb_interface(dev);
 492                 usb_drv = to_usb_driver(drv);
 493
 494                 id = usb_match_id(intf, usb_drv->id_table);
 495                 if (id)
 496                         return 1;
 497
 498                 id = usb_match_dynamic_id(intf, usb_drv);
 499                 if (id)
 500                         return 1;
 501         }
 502
 503         return 0;
 504 }
 505
 506 #ifdef  CONFIG_HOTPLUG
 507
 508 /*
 509  * This sends an uevent to userspace, typically helping to load driver
 510  * or other modules, configure the device, and more.  Drivers can provide
 511  * a MODULE_DEVICE_TABLE to help with module loading subtasks.
 512  *
 513  * We're called either from khubd (the typical case) or from root hub
 514  * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle
 515  * delays in event delivery.  Use sysfs (and DEVPATH) to make sure the
 516  * device (and this configuration!) are still present.
 517  */
 518 static int usb_uevent(struct device *dev, char **envp, int num_envp,
 519                       char *buffer, int buffer_size)
 520 {
 521         struct usb_interface *intf;
 522         struct usb_device *usb_dev;
 523         struct usb_host_interface *alt;
 524         int i = 0;
 525         int length = 0;
 526
 527         if (!dev)
 528                 return -ENODEV;
 529
 530         /* driver is often null here; dev_dbg() would oops */
 531         pr_debug ("usb %s: uevent\n", dev->bus_id);
 532
 533         if (is_usb_device(dev)) {
 534                 usb_dev = to_usb_device(dev);
 535                 alt = NULL;
 536         } else {
 537                 intf = to_usb_interface(dev);
 538                 usb_dev = interface_to_usbdev(intf);
 539                 alt = intf->cur_altsetting;
 540         }
 541
 542         if (usb_dev->devnum < 0) {
 543                 pr_debug ("usb %s: already deleted?\n", dev->bus_id);
 544                 return -ENODEV;
 545         }
 546         if (!usb_dev->bus) {
 547                 pr_debug ("usb %s: bus removed?\n", dev->bus_id);
 548                 return -ENODEV;
 549         }
 550
 551 #ifdef  CONFIG_USB_DEVICEFS
 552         /* If this is available, userspace programs can directly read
 553          * all the device descriptors we don't tell them about.  Or
 554          * even act as usermode drivers.
 555          *
 556          * FIXME reduce hardwired intelligence here
 557          */
 558         if (add_uevent_var(envp, num_envp, &i,
 559                            buffer, buffer_size, &length,
 560                            "DEVICE=/proc/bus/usb/%03d/%03d",
 561                            usb_dev->bus->busnum, usb_dev->devnum))
 562                 return -ENOMEM;
 563 #endif
 564
 565         /* per-device configurations are common */
 566         if (add_uevent_var(envp, num_envp, &i,
 567                            buffer, buffer_size, &length,
 568                            "PRODUCT=%x/%x/%x",
 569                            le16_to_cpu(usb_dev->descriptor.idVendor),
 570                            le16_to_cpu(usb_dev->descriptor.idProduct),
 571                            le16_to_cpu(usb_dev->descriptor.bcdDevice)))
 572                 return -ENOMEM;
 573
 574         /* class-based driver binding models */
 575         if (add_uevent_var(envp, num_envp, &i,
 576                            buffer, buffer_size, &length,
 577                            "TYPE=%d/%d/%d",
 578                            usb_dev->descriptor.bDeviceClass,
 579                            usb_dev->descriptor.bDeviceSubClass,
 580                            usb_dev->descriptor.bDeviceProtocol))
 581                 return -ENOMEM;
 582
 583         if (!is_usb_device(dev)) {
 584
 585                 if (add_uevent_var(envp, num_envp, &i,
 586                            buffer, buffer_size, &length,
 587                            "INTERFACE=%d/%d/%d",
 588                            alt->desc.bInterfaceClass,
 589                            alt->desc.bInterfaceSubClass,
 590                            alt->desc.bInterfaceProtocol))
 591                         return -ENOMEM;
 592
 593                 if (add_uevent_var(envp, num_envp, &i,
 594                            buffer, buffer_size, &length,
 595                            "MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X",
 596                            le16_to_cpu(usb_dev->descriptor.idVendor),
 597                            le16_to_cpu(usb_dev->descriptor.idProduct),
 598                            le16_to_cpu(usb_dev->descriptor.bcdDevice),
 599                            usb_dev->descriptor.bDeviceClass,
 600                            usb_dev->descriptor.bDeviceSubClass,
 601                            usb_dev->descriptor.bDeviceProtocol,
 602                            alt->desc.bInterfaceClass,
 603                            alt->desc.bInterfaceSubClass,
 604                            alt->desc.bInterfaceProtocol))
 605                         return -ENOMEM;
 606         }
 607
 608         envp[i] = NULL;
 609
 610         return 0;
 611 }
 612
 613 #else
 614
 615 static int usb_uevent(struct device *dev, char **envp,
 616                         int num_envp, char *buffer, int buffer_size)
 617 {
 618         return -ENODEV;
 619 }
 620
 621 #endif  /* CONFIG_HOTPLUG */
 622
 623 /**
 624  * usb_register_device_driver - register a USB device (not interface) driver
 625  * @new_udriver: USB operations for the device driver
 626  * @owner: module owner of this driver.
 627  *
 628  * Registers a USB device driver with the USB core.  The list of
 629  * unattached devices will be rescanned whenever a new driver is
 630  * added, allowing the new driver to attach to any recognized devices.
 631  * Returns a negative error code on failure and 0 on success.
 632  */
 633 int usb_register_device_driver(struct usb_device_driver *new_udriver,
 634                 struct module *owner)
 635 {
 636         int retval = 0;
 637
 638         if (usb_disabled())
 639                 return -ENODEV;
 640
 641         new_udriver->drvwrap.for_devices = 1;
 642         new_udriver->drvwrap.driver.name = (char *) new_udriver->name;
 643         new_udriver->drvwrap.driver.bus = &usb_bus_type;
 644         new_udriver->drvwrap.driver.probe = usb_probe_device;
 645         new_udriver->drvwrap.driver.remove = usb_unbind_device;
 646         new_udriver->drvwrap.driver.owner = owner;
 647
 648         retval = driver_register(&new_udriver->drvwrap.driver);
 649
 650         if (!retval) {
 651                 pr_info("%s: registered new device driver %s\n",
 652                         usbcore_name, new_udriver->name);
 653                 usbfs_update_special();
 654         } else {
 655                 printk(KERN_ERR "%s: error %d registering device "
 656                         "       driver %s\n",
 657                         usbcore_name, retval, new_udriver->name);
 658         }
 659
 660         return retval;
 661 }
 662 EXPORT_SYMBOL_GPL(usb_register_device_driver);
 663
 664 /**
 665  * usb_deregister_device_driver - unregister a USB device (not interface) driver
 666  * @udriver: USB operations of the device driver to unregister
 667  * Context: must be able to sleep
 668  *
 669  * Unlinks the specified driver from the internal USB driver list.
 670  */
 671 void usb_deregister_device_driver(struct usb_device_driver *udriver)
 672 {
 673         pr_info("%s: deregistering device driver %s\n",
 674                         usbcore_name, udriver->name);
 675
 676         driver_unregister(&udriver->drvwrap.driver);
 677         usbfs_update_special();
 678 }
 679 EXPORT_SYMBOL_GPL(usb_deregister_device_driver);
 680
 681 /**
 682  * usb_register_driver - register a USB interface driver
 683  * @new_driver: USB operations for the interface driver
 684  * @owner: module owner of this driver.
 685  *
 686  * Registers a USB interface driver with the USB core.  The list of
 687  * unattached interfaces will be rescanned whenever a new driver is
 688  * added, allowing the new driver to attach to any recognized interfaces.
 689  * Returns a negative error code on failure and 0 on success.
 690  *
 691  * NOTE: if you want your driver to use the USB major number, you must call
 692  * usb_register_dev() to enable that functionality.  This function no longer
 693  * takes care of that.
 694  */
 695 int usb_register_driver(struct usb_driver *new_driver, struct module *owner)
 696 {
 697         int retval = 0;
 698
 699         if (usb_disabled())
 700                 return -ENODEV;
 701
 702         new_driver->drvwrap.for_devices = 0;
 703         new_driver->drvwrap.driver.name = (char *) new_driver->name;
 704         new_driver->drvwrap.driver.bus = &usb_bus_type;
 705         new_driver->drvwrap.driver.probe = usb_probe_interface;
 706         new_driver->drvwrap.driver.remove = usb_unbind_interface;
 707         new_driver->drvwrap.driver.owner = owner;
 708         spin_lock_init(&new_driver->dynids.lock);
 709         INIT_LIST_HEAD(&new_driver->dynids.list);
 710
 711         retval = driver_register(&new_driver->drvwrap.driver);
 712
 713         if (!retval) {
 714                 pr_info("%s: registered new interface driver %s\n",
 715                         usbcore_name, new_driver->name);
 716                 usbfs_update_special();
 717                 usb_create_newid_file(new_driver);
 718         } else {
 719                 printk(KERN_ERR "%s: error %d registering interface "
 720                         "       driver %s\n",
 721                         usbcore_name, retval, new_driver->name);
 722         }
 723
 724         return retval;
 725 }
 726 EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver);
 727
 728 /**
 729  * usb_deregister - unregister a USB interface driver
 730  * @driver: USB operations of the interface driver to unregister
 731  * Context: must be able to sleep
 732  *
 733  * Unlinks the specified driver from the internal USB driver list.
 734  *
 735  * NOTE: If you called usb_register_dev(), you still need to call
 736  * usb_deregister_dev() to clean up your driver's allocated minor numbers,
 737  * this * call will no longer do it for you.
 738  */
 739 void usb_deregister(struct usb_driver *driver)
 740 {
 741         pr_info("%s: deregistering interface driver %s\n",
 742                         usbcore_name, driver->name);
 743
 744         usb_remove_newid_file(driver);
 745         usb_free_dynids(driver);
 746         driver_unregister(&driver->drvwrap.driver);
 747
 748         usbfs_update_special();
 749 }
 750 EXPORT_SYMBOL_GPL_FUTURE(usb_deregister);
 751
 752 #ifdef CONFIG_PM
 753
 754 static int usb_suspend(struct device *dev, pm_message_t message)
 755 {
 756         struct usb_device               *udev;
 757         struct usb_device_driver        *udriver;
 758         struct usb_interface            *intf;
 759         struct usb_driver               *driver;
 760         int                             status;
 761
 762         if (is_usb_device(dev)) {
 763                 if (dev->driver == NULL)
 764                         return 0;
 765                 udev = to_usb_device(dev);
 766                 udriver = to_usb_device_driver(dev->driver);
 767                 if (dev->power.power_state.event == message.event)
 768                         return 0;
 769                 return udriver->suspend(udev, message);
 770         }
 771
 772         if (dev->driver == NULL)
 773                 return 0;
 774
 775         intf = to_usb_interface(dev);
 776         driver = to_usb_driver(dev->driver);
 777
 778         /* with no hardware, USB interfaces only use FREEZE and ON states */
 779         if (!is_active(intf))
 780                 return 0;
 781
 782         if (driver->suspend && driver->resume) {
 783                 status = driver->suspend(intf, message);
 784                 if (status)
 785                         dev_err(dev, "%s error %d\n", "suspend", status);
 786                 else
 787                         mark_quiesced(intf);
 788         } else {
 789                 // FIXME else if there's no suspend method, disconnect...
 790                 dev_warn(dev, "no suspend for driver %s?\n", driver->name);
 791                 mark_quiesced(intf);
 792                 status = 0;
 793         }
 794         return status;
 795 }
 796
 797 static int usb_resume(struct device *dev)
 798 {
 799         struct usb_device               *udev;
 800         struct usb_device_driver        *udriver;
 801         struct usb_interface            *intf;
 802         struct usb_driver               *driver;
 803         int                             status;
 804
 805         if (dev->power.power_state.event == PM_EVENT_ON)
 806                 return 0;
 807
 808         /* mark things as "on" immediately, no matter what errors crop up */
 809         dev->power.power_state.event = PM_EVENT_ON;
 810
 811         /* devices resume through their hubs */
 812         if (is_usb_device(dev)) {
 813                 if (dev->driver == NULL)
 814                         return 0;
 815                 udev = to_usb_device(dev);
 816                 udriver = to_usb_device_driver(dev->driver);
 817                 if (udev->state == USB_STATE_NOTATTACHED)
 818                         return 0;
 819                 return udriver->resume(udev);
 820         }
 821
 822         if (dev->driver == NULL) {
 823                 dev->power.power_state.event = PM_EVENT_FREEZE;
 824                 return 0;
 825         }
 826
 827         intf = to_usb_interface(dev);
 828         driver = to_usb_driver(dev->driver);
 829
 830         udev = interface_to_usbdev(intf);
 831         if (udev->state == USB_STATE_NOTATTACHED)
 832                 return 0;
 833
 834         /* if driver was suspended, it has a resume method;
 835          * however, sysfs can wrongly mark things as suspended
 836          * (on the "no suspend method" FIXME path above)
 837          */
 838         if (driver->resume) {
 839                 status = driver->resume(intf);
 840                 if (status) {
 841                         dev_err(dev, "%s error %d\n", "resume", status);
 842                         mark_quiesced(intf);
 843                 }
 844         } else
 845                 dev_warn(dev, "no resume for driver %s?\n", driver->name);
 846         return 0;
 847 }
 848
 849 #endif /* CONFIG_PM */
 850
 851 struct bus_type usb_bus_type = {
 852         .name =         "usb",
 853         .match =        usb_device_match,
 854         .uevent =       usb_uevent,
 855 #ifdef CONFIG_PM
 856         .suspend =      usb_suspend,
 857         .resume =       usb_resume,
 858 #endif
 859 };