drivers/base/platform.c

   1 /*
   2  * platform.c - platform 'pseudo' bus for legacy devices
   3  *
   4  * Copyright (c) 2002-3 Patrick Mochel
   5  * Copyright (c) 2002-3 Open Source Development Labs
   6  *
   7  * This file is released under the GPLv2
   8  *
   9  * Please see Documentation/driver-model/platform.txt for more
  10  * information.
  11  */
  12
  13 #include <linux/platform_device.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/err.h>
  19 #include <linux/slab.h>
  20
  21 #include "base.h"
  22
  23 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
  24                                  driver))
  25
  26 struct device platform_bus = {
  27         .bus_id         = "platform",
  28 };
  29 EXPORT_SYMBOL_GPL(platform_bus);
  30
  31 /**
  32  * platform_get_resource - get a resource for a device
  33  * @dev: platform device
  34  * @type: resource type
  35  * @num: resource index
  36  */
  37 struct resource *platform_get_resource(struct platform_device *dev,
  38                                        unsigned int type, unsigned int num)
  39 {
  40         int i;
  41
  42         for (i = 0; i < dev->num_resources; i++) {
  43                 struct resource *r = &dev->resource[i];
  44
  45                 if (type == resource_type(r) && num-- == 0)
  46                         return r;
  47         }
  48         return NULL;
  49 }
  50 EXPORT_SYMBOL_GPL(platform_get_resource);
  51
  52 /**
  53  * platform_get_irq - get an IRQ for a device
  54  * @dev: platform device
  55  * @num: IRQ number index
  56  */
  57 int platform_get_irq(struct platform_device *dev, unsigned int num)
  58 {
  59         struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
  60
  61         return r ? r->start : -ENXIO;
  62 }
  63 EXPORT_SYMBOL_GPL(platform_get_irq);
  64
  65 /**
  66  * platform_get_resource_byname - get a resource for a device by name
  67  * @dev: platform device
  68  * @type: resource type
  69  * @name: resource name
  70  */
  71 struct resource *platform_get_resource_byname(struct platform_device *dev,
  72                                               unsigned int type, char *name)
  73 {
  74         int i;
  75
  76         for (i = 0; i < dev->num_resources; i++) {
  77                 struct resource *r = &dev->resource[i];
  78
  79                 if (type == resource_type(r) && !strcmp(r->name, name))
  80                         return r;
  81         }
  82         return NULL;
  83 }
  84 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
  85
  86 /**
  87  * platform_get_irq - get an IRQ for a device
  88  * @dev: platform device
  89  * @name: IRQ name
  90  */
  91 int platform_get_irq_byname(struct platform_device *dev, char *name)
  92 {
  93         struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
  94                                                           name);
  95
  96         return r ? r->start : -ENXIO;
  97 }
  98 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
  99
 100 /**
 101  * platform_add_devices - add a numbers of platform devices
 102  * @devs: array of platform devices to add
 103  * @num: number of platform devices in array
 104  */
 105 int platform_add_devices(struct platform_device **devs, int num)
 106 {
 107         int i, ret = 0;
 108
 109         for (i = 0; i < num; i++) {
 110                 ret = platform_device_register(devs[i]);
 111                 if (ret) {
 112                         while (--i >= 0)
 113                                 platform_device_unregister(devs[i]);
 114                         break;
 115                 }
 116         }
 117
 118         return ret;
 119 }
 120 EXPORT_SYMBOL_GPL(platform_add_devices);
 121
 122 struct platform_object {
 123         struct platform_device pdev;
 124         char name[1];
 125 };
 126
 127 /**
 128  * platform_device_put
 129  * @pdev: platform device to free
 130  *
 131  * Free all memory associated with a platform device.  This function must
 132  * _only_ be externally called in error cases.  All other usage is a bug.
 133  */
 134 void platform_device_put(struct platform_device *pdev)
 135 {
 136         if (pdev)
 137                 put_device(&pdev->dev);
 138 }
 139 EXPORT_SYMBOL_GPL(platform_device_put);
 140
 141 static void platform_device_release(struct device *dev)
 142 {
 143         struct platform_object *pa = container_of(dev, struct platform_object,
 144                                                   pdev.dev);
 145
 146         kfree(pa->pdev.dev.platform_data);
 147         kfree(pa->pdev.resource);
 148         kfree(pa);
 149 }
 150
 151 /**
 152  * platform_device_alloc
 153  * @name: base name of the device we're adding
 154  * @id: instance id
 155  *
 156  * Create a platform device object which can have other objects attached
 157  * to it, and which will have attached objects freed when it is released.
 158  */
 159 struct platform_device *platform_device_alloc(const char *name, int id)
 160 {
 161         struct platform_object *pa;
 162
 163         pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
 164         if (pa) {
 165                 strcpy(pa->name, name);
 166                 pa->pdev.name = pa->name;
 167                 pa->pdev.id = id;
 168                 device_initialize(&pa->pdev.dev);
 169                 pa->pdev.dev.release = platform_device_release;
 170         }
 171
 172         return pa ? &pa->pdev : NULL;
 173 }
 174 EXPORT_SYMBOL_GPL(platform_device_alloc);
 175
 176 /**
 177  * platform_device_add_resources
 178  * @pdev: platform device allocated by platform_device_alloc to add resources to
 179  * @res: set of resources that needs to be allocated for the device
 180  * @num: number of resources
 181  *
 182  * Add a copy of the resources to the platform device.  The memory
 183  * associated with the resources will be freed when the platform device is
 184  * released.
 185  */
 186 int platform_device_add_resources(struct platform_device *pdev,
 187                                   struct resource *res, unsigned int num)
 188 {
 189         struct resource *r;
 190
 191         r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL);
 192         if (r) {
 193                 memcpy(r, res, sizeof(struct resource) * num);
 194                 pdev->resource = r;
 195                 pdev->num_resources = num;
 196         }
 197         return r ? 0 : -ENOMEM;
 198 }
 199 EXPORT_SYMBOL_GPL(platform_device_add_resources);
 200
 201 /**
 202  * platform_device_add_data
 203  * @pdev: platform device allocated by platform_device_alloc to add resources to
 204  * @data: platform specific data for this platform device
 205  * @size: size of platform specific data
 206  *
 207  * Add a copy of platform specific data to the platform device's
 208  * platform_data pointer.  The memory associated with the platform data
 209  * will be freed when the platform device is released.
 210  */
 211 int platform_device_add_data(struct platform_device *pdev, const void *data,
 212                              size_t size)
 213 {
 214         void *d;
 215
 216         d = kmalloc(size, GFP_KERNEL);
 217         if (d) {
 218                 memcpy(d, data, size);
 219                 pdev->dev.platform_data = d;
 220         }
 221         return d ? 0 : -ENOMEM;
 222 }
 223 EXPORT_SYMBOL_GPL(platform_device_add_data);
 224
 225 /**
 226  * platform_device_add - add a platform device to device hierarchy
 227  * @pdev: platform device we're adding
 228  *
 229  * This is part 2 of platform_device_register(), though may be called
 230  * separately _iff_ pdev was allocated by platform_device_alloc().
 231  */
 232 int platform_device_add(struct platform_device *pdev)
 233 {
 234         int i, ret = 0;
 235
 236         if (!pdev)
 237                 return -EINVAL;
 238
 239         if (!pdev->dev.parent)
 240                 pdev->dev.parent = &platform_bus;
 241
 242         pdev->dev.bus = &platform_bus_type;
 243
 244         if (pdev->id != -1)
 245                 snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%d", pdev->name,
 246                          pdev->id);
 247         else
 248                 strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE);
 249
 250         for (i = 0; i < pdev->num_resources; i++) {
 251                 struct resource *p, *r = &pdev->resource[i];
 252
 253                 if (r->name == NULL)
 254                         r->name = pdev->dev.bus_id;
 255
 256                 p = r->parent;
 257                 if (!p) {
 258                         if (resource_type(r) == IORESOURCE_MEM)
 259                                 p = &iomem_resource;
 260                         else if (resource_type(r) == IORESOURCE_IO)
 261                                 p = &ioport_resource;
 262                 }
 263
 264                 if (p && insert_resource(p, r)) {
 265                         printk(KERN_ERR
 266                                "%s: failed to claim resource %d\n",
 267                                pdev->dev.bus_id, i);
 268                         ret = -EBUSY;
 269                         goto failed;
 270                 }
 271         }
 272
 273         pr_debug("Registering platform device '%s'. Parent at %s\n",
 274                  pdev->dev.bus_id, pdev->dev.parent->bus_id);
 275
 276         ret = device_add(&pdev->dev);
 277         if (ret == 0)
 278                 return ret;
 279
 280  failed:
 281         while (--i >= 0) {
 282                 struct resource *r = &pdev->resource[i];
 283                 unsigned long type = resource_type(r);
 284
 285                 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
 286                         release_resource(r);
 287         }
 288
 289         return ret;
 290 }
 291 EXPORT_SYMBOL_GPL(platform_device_add);
 292
 293 /**
 294  * platform_device_del - remove a platform-level device
 295  * @pdev: platform device we're removing
 296  *
 297  * Note that this function will also release all memory- and port-based
 298  * resources owned by the device (@dev->resource).  This function must
 299  * _only_ be externally called in error cases.  All other usage is a bug.
 300  */
 301 void platform_device_del(struct platform_device *pdev)
 302 {
 303         int i;
 304
 305         if (pdev) {
 306                 device_del(&pdev->dev);
 307
 308                 for (i = 0; i < pdev->num_resources; i++) {
 309                         struct resource *r = &pdev->resource[i];
 310                         unsigned long type = resource_type(r);
 311
 312                         if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
 313                                 release_resource(r);
 314                 }
 315         }
 316 }
 317 EXPORT_SYMBOL_GPL(platform_device_del);
 318
 319 /**
 320  * platform_device_register - add a platform-level device
 321  * @pdev: platform device we're adding
 322  */
 323 int platform_device_register(struct platform_device *pdev)
 324 {
 325         device_initialize(&pdev->dev);
 326         return platform_device_add(pdev);
 327 }
 328 EXPORT_SYMBOL_GPL(platform_device_register);
 329
 330 /**
 331  * platform_device_unregister - unregister a platform-level device
 332  * @pdev: platform device we're unregistering
 333  *
 334  * Unregistration is done in 2 steps. First we release all resources
 335  * and remove it from the subsystem, then we drop reference count by
 336  * calling platform_device_put().
 337  */
 338 void platform_device_unregister(struct platform_device *pdev)
 339 {
 340         platform_device_del(pdev);
 341         platform_device_put(pdev);
 342 }
 343 EXPORT_SYMBOL_GPL(platform_device_unregister);
 344
 345 /**
 346  * platform_device_register_simple
 347  * @name: base name of the device we're adding
 348  * @id: instance id
 349  * @res: set of resources that needs to be allocated for the device
 350  * @num: number of resources
 351  *
 352  * This function creates a simple platform device that requires minimal
 353  * resource and memory management. Canned release function freeing memory
 354  * allocated for the device allows drivers using such devices to be
 355  * unloaded without waiting for the last reference to the device to be
 356  * dropped.
 357  *
 358  * This interface is primarily intended for use with legacy drivers which
 359  * probe hardware directly.  Because such drivers create sysfs device nodes
 360  * themselves, rather than letting system infrastructure handle such device
 361  * enumeration tasks, they don't fully conform to the Linux driver model.
 362  * In particular, when such drivers are built as modules, they can't be
 363  * "hotplugged".
 364  */
 365 struct platform_device *platform_device_register_simple(const char *name,
 366                                                         int id,
 367                                                         struct resource *res,
 368                                                         unsigned int num)
 369 {
 370         struct platform_device *pdev;
 371         int retval;
 372
 373         pdev = platform_device_alloc(name, id);
 374         if (!pdev) {
 375                 retval = -ENOMEM;
 376                 goto error;
 377         }
 378
 379         if (num) {
 380                 retval = platform_device_add_resources(pdev, res, num);
 381                 if (retval)
 382                         goto error;
 383         }
 384
 385         retval = platform_device_add(pdev);
 386         if (retval)
 387                 goto error;
 388
 389         return pdev;
 390
 391 error:
 392         platform_device_put(pdev);
 393         return ERR_PTR(retval);
 394 }
 395 EXPORT_SYMBOL_GPL(platform_device_register_simple);
 396
 397 /**
 398  * platform_device_register_data
 399  * @parent: parent device for the device we're adding
 400  * @name: base name of the device we're adding
 401  * @id: instance id
 402  * @data: platform specific data for this platform device
 403  * @size: size of platform specific data
 404  *
 405  * This function creates a simple platform device that requires minimal
 406  * resource and memory management. Canned release function freeing memory
 407  * allocated for the device allows drivers using such devices to be
 408  * unloaded without waiting for the last reference to the device to be
 409  * dropped.
 410  */
 411 struct platform_device *platform_device_register_data(
 412                 struct device *parent,
 413                 const char *name, int id,
 414                 const void *data, size_t size)
 415 {
 416         struct platform_device *pdev;
 417         int retval;
 418
 419         pdev = platform_device_alloc(name, id);
 420         if (!pdev) {
 421                 retval = -ENOMEM;
 422                 goto error;
 423         }
 424
 425         pdev->dev.parent = parent;
 426
 427         if (size) {
 428                 retval = platform_device_add_data(pdev, data, size);
 429                 if (retval)
 430                         goto error;
 431         }
 432
 433         retval = platform_device_add(pdev);
 434         if (retval)
 435                 goto error;
 436
 437         return pdev;
 438
 439 error:
 440         platform_device_put(pdev);
 441         return ERR_PTR(retval);
 442 }
 443
 444 static int platform_drv_probe(struct device *_dev)
 445 {
 446         struct platform_driver *drv = to_platform_driver(_dev->driver);
 447         struct platform_device *dev = to_platform_device(_dev);
 448
 449         return drv->probe(dev);
 450 }
 451
 452 static int platform_drv_probe_fail(struct device *_dev)
 453 {
 454         return -ENXIO;
 455 }
 456
 457 static int platform_drv_remove(struct device *_dev)
 458 {
 459         struct platform_driver *drv = to_platform_driver(_dev->driver);
 460         struct platform_device *dev = to_platform_device(_dev);
 461
 462         return drv->remove(dev);
 463 }
 464
 465 static void platform_drv_shutdown(struct device *_dev)
 466 {
 467         struct platform_driver *drv = to_platform_driver(_dev->driver);
 468         struct platform_device *dev = to_platform_device(_dev);
 469
 470         drv->shutdown(dev);
 471 }
 472
 473 static int platform_drv_suspend(struct device *_dev, pm_message_t state)
 474 {
 475         struct platform_driver *drv = to_platform_driver(_dev->driver);
 476         struct platform_device *dev = to_platform_device(_dev);
 477
 478         return drv->suspend(dev, state);
 479 }
 480
 481 static int platform_drv_resume(struct device *_dev)
 482 {
 483         struct platform_driver *drv = to_platform_driver(_dev->driver);
 484         struct platform_device *dev = to_platform_device(_dev);
 485
 486         return drv->resume(dev);
 487 }
 488
 489 /**
 490  * platform_driver_register
 491  * @drv: platform driver structure
 492  */
 493 int platform_driver_register(struct platform_driver *drv)
 494 {
 495         drv->driver.bus = &platform_bus_type;
 496         if (drv->probe)
 497                 drv->driver.probe = platform_drv_probe;
 498         if (drv->remove)
 499                 drv->driver.remove = platform_drv_remove;
 500         if (drv->shutdown)
 501                 drv->driver.shutdown = platform_drv_shutdown;
 502         if (drv->suspend)
 503                 drv->driver.suspend = platform_drv_suspend;
 504         if (drv->resume)
 505                 drv->driver.resume = platform_drv_resume;
 506         if (drv->pm)
 507                 drv->driver.pm = &drv->pm->base;
 508         return driver_register(&drv->driver);
 509 }
 510 EXPORT_SYMBOL_GPL(platform_driver_register);
 511
 512 /**
 513  * platform_driver_unregister
 514  * @drv: platform driver structure
 515  */
 516 void platform_driver_unregister(struct platform_driver *drv)
 517 {
 518         driver_unregister(&drv->driver);
 519 }
 520 EXPORT_SYMBOL_GPL(platform_driver_unregister);
 521
 522 /**
 523  * platform_driver_probe - register driver for non-hotpluggable device
 524  * @drv: platform driver structure
 525  * @probe: the driver probe routine, probably from an __init section
 526  *
 527  * Use this instead of platform_driver_register() when you know the device
 528  * is not hotpluggable and has already been registered, and you want to
 529  * remove its run-once probe() infrastructure from memory after the driver
 530  * has bound to the device.
 531  *
 532  * One typical use for this would be with drivers for controllers integrated
 533  * into system-on-chip processors, where the controller devices have been
 534  * configured as part of board setup.
 535  *
 536  * Returns zero if the driver registered and bound to a device, else returns
 537  * a negative error code and with the driver not registered.
 538  */
 539 int __init_or_module platform_driver_probe(struct platform_driver *drv,
 540                 int (*probe)(struct platform_device *))
 541 {
 542         int retval, code;
 543
 544         /* temporary section violation during probe() */
 545         drv->probe = probe;
 546         retval = code = platform_driver_register(drv);
 547
 548         /* Fixup that section violation, being paranoid about code scanning
 549          * the list of drivers in order to probe new devices.  Check to see
 550          * if the probe was successful, and make sure any forced probes of
 551          * new devices fail.
 552          */
 553         spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
 554         drv->probe = NULL;
 555         if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
 556                 retval = -ENODEV;
 557         drv->driver.probe = platform_drv_probe_fail;
 558         spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
 559
 560         if (code != retval)
 561                 platform_driver_unregister(drv);
 562         return retval;
 563 }
 564 EXPORT_SYMBOL_GPL(platform_driver_probe);
 565
 566 /* modalias support enables more hands-off userspace setup:
 567  * (a) environment variable lets new-style hotplug events work once system is
 568  *     fully running:  "modprobe $MODALIAS"
 569  * (b) sysfs attribute lets new-style coldplug recover from hotplug events
 570  *     mishandled before system is fully running:  "modprobe $(cat modalias)"
 571  */
 572 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 573                              char *buf)
 574 {
 575         struct platform_device  *pdev = to_platform_device(dev);
 576         int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
 577
 578         return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
 579 }
 580
 581 static struct device_attribute platform_dev_attrs[] = {
 582         __ATTR_RO(modalias),
 583         __ATTR_NULL,
 584 };
 585
 586 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
 587 {
 588         struct platform_device  *pdev = to_platform_device(dev);
 589
 590         add_uevent_var(env, "MODALIAS=platform:%s", pdev->name);
 591         return 0;
 592 }
 593
 594 /**
 595  * platform_match - bind platform device to platform driver.
 596  * @dev: device.
 597  * @drv: driver.
 598  *
 599  * Platform device IDs are assumed to be encoded like this:
 600  * "<name><instance>", where <name> is a short description of the type of
 601  * device, like "pci" or "floppy", and <instance> is the enumerated
 602  * instance of the device, like '0' or '42'.  Driver IDs are simply
 603  * "<name>".  So, extract the <name> from the platform_device structure,
 604  * and compare it against the name of the driver. Return whether they match
 605  * or not.
 606  */
 607 static int platform_match(struct device *dev, struct device_driver *drv)
 608 {
 609         struct platform_device *pdev;
 610
 611         pdev = container_of(dev, struct platform_device, dev);
 612         return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);
 613 }
 614
 615 #ifdef CONFIG_PM_SLEEP
 616
 617 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 618 {
 619         int ret = 0;
 620
 621         if (dev->driver && dev->driver->suspend)
 622                 ret = dev->driver->suspend(dev, mesg);
 623
 624         return ret;
 625 }
 626
 627 static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg)
 628 {
 629         struct platform_driver *drv = to_platform_driver(dev->driver);
 630         struct platform_device *pdev;
 631         int ret = 0;
 632
 633         pdev = container_of(dev, struct platform_device, dev);
 634         if (dev->driver && drv->suspend_late)
 635                 ret = drv->suspend_late(pdev, mesg);
 636
 637         return ret;
 638 }
 639
 640 static int platform_legacy_resume_early(struct device *dev)
 641 {
 642         struct platform_driver *drv = to_platform_driver(dev->driver);
 643         struct platform_device *pdev;
 644         int ret = 0;
 645
 646         pdev = container_of(dev, struct platform_device, dev);
 647         if (dev->driver && drv->resume_early)
 648                 ret = drv->resume_early(pdev);
 649
 650         return ret;
 651 }
 652
 653 static int platform_legacy_resume(struct device *dev)
 654 {
 655         int ret = 0;
 656
 657         if (dev->driver && dev->driver->resume)
 658                 ret = dev->driver->resume(dev);
 659
 660         return ret;
 661 }
 662
 663 static int platform_pm_prepare(struct device *dev)
 664 {
 665         struct device_driver *drv = dev->driver;
 666         int ret = 0;
 667
 668         if (drv && drv->pm && drv->pm->prepare)
 669                 ret = drv->pm->prepare(dev);
 670
 671         return ret;
 672 }
 673
 674 static void platform_pm_complete(struct device *dev)
 675 {
 676         struct device_driver *drv = dev->driver;
 677
 678         if (drv && drv->pm && drv->pm->complete)
 679                 drv->pm->complete(dev);
 680 }
 681
 682 #ifdef CONFIG_SUSPEND
 683
 684 static int platform_pm_suspend(struct device *dev)
 685 {
 686         struct device_driver *drv = dev->driver;
 687         int ret = 0;
 688
 689         if (drv && drv->pm) {
 690                 if (drv->pm->suspend)
 691                         ret = drv->pm->suspend(dev);
 692         } else {
 693                 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
 694         }
 695
 696         return ret;
 697 }
 698
 699 static int platform_pm_suspend_noirq(struct device *dev)
 700 {
 701         struct platform_driver *pdrv;
 702         int ret = 0;
 703
 704         if (!dev->driver)
 705                 return 0;
 706
 707         pdrv = to_platform_driver(dev->driver);
 708         if (pdrv->pm) {
 709                 if (pdrv->pm->suspend_noirq)
 710                         ret = pdrv->pm->suspend_noirq(dev);
 711         } else {
 712                 ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND);
 713         }
 714
 715         return ret;
 716 }
 717
 718 static int platform_pm_resume(struct device *dev)
 719 {
 720         struct device_driver *drv = dev->driver;
 721         int ret = 0;
 722
 723         if (drv && drv->pm) {
 724                 if (drv->pm->resume)
 725                         ret = drv->pm->resume(dev);
 726         } else {
 727                 ret = platform_legacy_resume(dev);
 728         }
 729
 730         return ret;
 731 }
 732
 733 static int platform_pm_resume_noirq(struct device *dev)
 734 {
 735         struct platform_driver *pdrv;
 736         int ret = 0;
 737
 738         if (!dev->driver)
 739                 return 0;
 740
 741         pdrv = to_platform_driver(dev->driver);
 742         if (pdrv->pm) {
 743                 if (pdrv->pm->resume_noirq)
 744                         ret = pdrv->pm->resume_noirq(dev);
 745         } else {
 746                 ret = platform_legacy_resume_early(dev);
 747         }
 748
 749         return ret;
 750 }
 751
 752 #else /* !CONFIG_SUSPEND */
 753
 754 #define platform_pm_suspend             NULL
 755 #define platform_pm_resume              NULL
 756 #define platform_pm_suspend_noirq       NULL
 757 #define platform_pm_resume_noirq        NULL
 758
 759 #endif /* !CONFIG_SUSPEND */
 760
 761 #ifdef CONFIG_HIBERNATION
 762
 763 static int platform_pm_freeze(struct device *dev)
 764 {
 765         struct device_driver *drv = dev->driver;
 766         int ret = 0;
 767
 768         if (!drv)
 769                 return 0;
 770
 771         if (drv->pm) {
 772                 if (drv->pm->freeze)
 773                         ret = drv->pm->freeze(dev);
 774         } else {
 775                 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
 776         }
 777
 778         return ret;
 779 }
 780
 781 static int platform_pm_freeze_noirq(struct device *dev)
 782 {
 783         struct platform_driver *pdrv;
 784         int ret = 0;
 785
 786         if (!dev->driver)
 787                 return 0;
 788
 789         pdrv = to_platform_driver(dev->driver);
 790         if (pdrv->pm) {
 791                 if (pdrv->pm->freeze_noirq)
 792                         ret = pdrv->pm->freeze_noirq(dev);
 793         } else {
 794                 ret = platform_legacy_suspend_late(dev, PMSG_FREEZE);
 795         }
 796
 797         return ret;
 798 }
 799
 800 static int platform_pm_thaw(struct device *dev)
 801 {
 802         struct device_driver *drv = dev->driver;
 803         int ret = 0;
 804
 805         if (drv && drv->pm) {
 806                 if (drv->pm->thaw)
 807                         ret = drv->pm->thaw(dev);
 808         } else {
 809                 ret = platform_legacy_resume(dev);
 810         }
 811
 812         return ret;
 813 }
 814
 815 static int platform_pm_thaw_noirq(struct device *dev)
 816 {
 817         struct platform_driver *pdrv;
 818         int ret = 0;
 819
 820         if (!dev->driver)
 821                 return 0;
 822
 823         pdrv = to_platform_driver(dev->driver);
 824         if (pdrv->pm) {
 825                 if (pdrv->pm->thaw_noirq)
 826                         ret = pdrv->pm->thaw_noirq(dev);
 827         } else {
 828                 ret = platform_legacy_resume_early(dev);
 829         }
 830
 831         return ret;
 832 }
 833
 834 static int platform_pm_poweroff(struct device *dev)
 835 {
 836         struct device_driver *drv = dev->driver;
 837         int ret = 0;
 838
 839         if (drv && drv->pm) {
 840                 if (drv->pm->poweroff)
 841                         ret = drv->pm->poweroff(dev);
 842         } else {
 843                 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
 844         }
 845
 846         return ret;
 847 }
 848
 849 static int platform_pm_poweroff_noirq(struct device *dev)
 850 {
 851         struct platform_driver *pdrv;
 852         int ret = 0;
 853
 854         if (!dev->driver)
 855                 return 0;
 856
 857         pdrv = to_platform_driver(dev->driver);
 858         if (pdrv->pm) {
 859                 if (pdrv->pm->poweroff_noirq)
 860                         ret = pdrv->pm->poweroff_noirq(dev);
 861         } else {
 862                 ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE);
 863         }
 864
 865         return ret;
 866 }
 867
 868 static int platform_pm_restore(struct device *dev)
 869 {
 870         struct device_driver *drv = dev->driver;
 871         int ret = 0;
 872
 873         if (drv && drv->pm) {
 874                 if (drv->pm->restore)
 875                         ret = drv->pm->restore(dev);
 876         } else {
 877                 ret = platform_legacy_resume(dev);
 878         }
 879
 880         return ret;
 881 }
 882
 883 static int platform_pm_restore_noirq(struct device *dev)
 884 {
 885         struct platform_driver *pdrv;
 886         int ret = 0;
 887
 888         if (!dev->driver)
 889                 return 0;
 890
 891         pdrv = to_platform_driver(dev->driver);
 892         if (pdrv->pm) {
 893                 if (pdrv->pm->restore_noirq)
 894                         ret = pdrv->pm->restore_noirq(dev);
 895         } else {
 896                 ret = platform_legacy_resume_early(dev);
 897         }
 898
 899         return ret;
 900 }
 901
 902 #else /* !CONFIG_HIBERNATION */
 903
 904 #define platform_pm_freeze              NULL
 905 #define platform_pm_thaw                NULL
 906 #define platform_pm_poweroff            NULL
 907 #define platform_pm_restore             NULL
 908 #define platform_pm_freeze_noirq        NULL
 909 #define platform_pm_thaw_noirq          NULL
 910 #define platform_pm_poweroff_noirq      NULL
 911 #define platform_pm_restore_noirq       NULL
 912
 913 #endif /* !CONFIG_HIBERNATION */
 914
 915 static struct pm_ext_ops platform_pm_ops = {
 916         .base = {
 917                 .prepare = platform_pm_prepare,
 918                 .complete = platform_pm_complete,
 919                 .suspend = platform_pm_suspend,
 920                 .resume = platform_pm_resume,
 921                 .freeze = platform_pm_freeze,
 922                 .thaw = platform_pm_thaw,
 923                 .poweroff = platform_pm_poweroff,
 924                 .restore = platform_pm_restore,
 925         },
 926         .suspend_noirq = platform_pm_suspend_noirq,
 927         .resume_noirq = platform_pm_resume_noirq,
 928         .freeze_noirq = platform_pm_freeze_noirq,
 929         .thaw_noirq = platform_pm_thaw_noirq,
 930         .poweroff_noirq = platform_pm_poweroff_noirq,
 931         .restore_noirq = platform_pm_restore_noirq,
 932 };
 933
 934 #define PLATFORM_PM_OPS_PTR     &platform_pm_ops
 935
 936 #else /* !CONFIG_PM_SLEEP */
 937
 938 #define PLATFORM_PM_OPS_PTR     NULL
 939
 940 #endif /* !CONFIG_PM_SLEEP */
 941
 942 struct bus_type platform_bus_type = {
 943         .name           = "platform",
 944         .dev_attrs      = platform_dev_attrs,
 945         .match          = platform_match,
 946         .uevent         = platform_uevent,
 947         .pm             = PLATFORM_PM_OPS_PTR,
 948 };
 949 EXPORT_SYMBOL_GPL(platform_bus_type);
 950
 951 int __init platform_bus_init(void)
 952 {
 953         int error;
 954
 955         error = device_register(&platform_bus);
 956         if (error)
 957                 return error;
 958         error =  bus_register(&platform_bus_type);
 959         if (error)
 960                 device_unregister(&platform_bus);
 961         return error;
 962 }
 963
 964 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
 965 u64 dma_get_required_mask(struct device *dev)
 966 {
 967         u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
 968         u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
 969         u64 mask;
 970
 971         if (!high_totalram) {
 972                 /* convert to mask just covering totalram */
 973                 low_totalram = (1 << (fls(low_totalram) - 1));
 974                 low_totalram += low_totalram - 1;
 975                 mask = low_totalram;
 976         } else {
 977                 high_totalram = (1 << (fls(high_totalram) - 1));
 978                 high_totalram += high_totalram - 1;
 979                 mask = (((u64)high_totalram) << 32) + 0xffffffff;
 980         }
 981         return mask;
 982 }
 983 EXPORT_SYMBOL_GPL(dma_get_required_mask);
 984 #endif