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         .init_name      = "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                 dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
 246         else
 247                 dev_set_name(&pdev->dev, pdev->name);
 248
 249         for (i = 0; i < pdev->num_resources; i++) {
 250                 struct resource *p, *r = &pdev->resource[i];
 251
 252                 if (r->name == NULL)
 253                         r->name = dev_name(&pdev->dev);
 254
 255                 p = r->parent;
 256                 if (!p) {
 257                         if (resource_type(r) == IORESOURCE_MEM)
 258                                 p = &iomem_resource;
 259                         else if (resource_type(r) == IORESOURCE_IO)
 260                                 p = &ioport_resource;
 261                 }
 262
 263                 if (p && insert_resource(p, r)) {
 264                         printk(KERN_ERR
 265                                "%s: failed to claim resource %d\n",
 266                                dev_name(&pdev->dev), i);
 267                         ret = -EBUSY;
 268                         goto failed;
 269                 }
 270         }
 271
 272         pr_debug("Registering platform device '%s'. Parent at %s\n",
 273                  dev_name(&pdev->dev), dev_name(pdev->dev.parent));
 274
 275         ret = device_add(&pdev->dev);
 276         if (ret == 0)
 277                 return ret;
 278
 279  failed:
 280         while (--i >= 0) {
 281                 struct resource *r = &pdev->resource[i];
 282                 unsigned long type = resource_type(r);
 283
 284                 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
 285                         release_resource(r);
 286         }
 287
 288         return ret;
 289 }
 290 EXPORT_SYMBOL_GPL(platform_device_add);
 291
 292 /**
 293  * platform_device_del - remove a platform-level device
 294  * @pdev: platform device we're removing
 295  *
 296  * Note that this function will also release all memory- and port-based
 297  * resources owned by the device (@dev->resource).  This function must
 298  * _only_ be externally called in error cases.  All other usage is a bug.
 299  */
 300 void platform_device_del(struct platform_device *pdev)
 301 {
 302         int i;
 303
 304         if (pdev) {
 305                 device_del(&pdev->dev);
 306
 307                 for (i = 0; i < pdev->num_resources; i++) {
 308                         struct resource *r = &pdev->resource[i];
 309                         unsigned long type = resource_type(r);
 310
 311                         if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
 312                                 release_resource(r);
 313                 }
 314         }
 315 }
 316 EXPORT_SYMBOL_GPL(platform_device_del);
 317
 318 /**
 319  * platform_device_register - add a platform-level device
 320  * @pdev: platform device we're adding
 321  */
 322 int platform_device_register(struct platform_device *pdev)
 323 {
 324         device_initialize(&pdev->dev);
 325         return platform_device_add(pdev);
 326 }
 327 EXPORT_SYMBOL_GPL(platform_device_register);
 328
 329 /**
 330  * platform_device_unregister - unregister a platform-level device
 331  * @pdev: platform device we're unregistering
 332  *
 333  * Unregistration is done in 2 steps. First we release all resources
 334  * and remove it from the subsystem, then we drop reference count by
 335  * calling platform_device_put().
 336  */
 337 void platform_device_unregister(struct platform_device *pdev)
 338 {
 339         platform_device_del(pdev);
 340         platform_device_put(pdev);
 341 }
 342 EXPORT_SYMBOL_GPL(platform_device_unregister);
 343
 344 /**
 345  * platform_device_register_simple
 346  * @name: base name of the device we're adding
 347  * @id: instance id
 348  * @res: set of resources that needs to be allocated for the device
 349  * @num: number of resources
 350  *
 351  * This function creates a simple platform device that requires minimal
 352  * resource and memory management. Canned release function freeing memory
 353  * allocated for the device allows drivers using such devices to be
 354  * unloaded without waiting for the last reference to the device to be
 355  * dropped.
 356  *
 357  * This interface is primarily intended for use with legacy drivers which
 358  * probe hardware directly.  Because such drivers create sysfs device nodes
 359  * themselves, rather than letting system infrastructure handle such device
 360  * enumeration tasks, they don't fully conform to the Linux driver model.
 361  * In particular, when such drivers are built as modules, they can't be
 362  * "hotplugged".
 363  */
 364 struct platform_device *platform_device_register_simple(const char *name,
 365                                                         int id,
 366                                                         struct resource *res,
 367                                                         unsigned int num)
 368 {
 369         struct platform_device *pdev;
 370         int retval;
 371
 372         pdev = platform_device_alloc(name, id);
 373         if (!pdev) {
 374                 retval = -ENOMEM;
 375                 goto error;
 376         }
 377
 378         if (num) {
 379                 retval = platform_device_add_resources(pdev, res, num);
 380                 if (retval)
 381                         goto error;
 382         }
 383
 384         retval = platform_device_add(pdev);
 385         if (retval)
 386                 goto error;
 387
 388         return pdev;
 389
 390 error:
 391         platform_device_put(pdev);
 392         return ERR_PTR(retval);
 393 }
 394 EXPORT_SYMBOL_GPL(platform_device_register_simple);
 395
 396 /**
 397  * platform_device_register_data
 398  * @parent: parent device for the device we're adding
 399  * @name: base name of the device we're adding
 400  * @id: instance id
 401  * @data: platform specific data for this platform device
 402  * @size: size of platform specific data
 403  *
 404  * This function creates a simple platform device that requires minimal
 405  * resource and memory management. Canned release function freeing memory
 406  * allocated for the device allows drivers using such devices to be
 407  * unloaded without waiting for the last reference to the device to be
 408  * dropped.
 409  */
 410 struct platform_device *platform_device_register_data(
 411                 struct device *parent,
 412                 const char *name, int id,
 413                 const void *data, size_t size)
 414 {
 415         struct platform_device *pdev;
 416         int retval;
 417
 418         pdev = platform_device_alloc(name, id);
 419         if (!pdev) {
 420                 retval = -ENOMEM;
 421                 goto error;
 422         }
 423
 424         pdev->dev.parent = parent;
 425
 426         if (size) {
 427                 retval = platform_device_add_data(pdev, data, size);
 428                 if (retval)
 429                         goto error;
 430         }
 431
 432         retval = platform_device_add(pdev);
 433         if (retval)
 434                 goto error;
 435
 436         return pdev;
 437
 438 error:
 439         platform_device_put(pdev);
 440         return ERR_PTR(retval);
 441 }
 442
 443 static int platform_drv_probe(struct device *_dev)
 444 {
 445         struct platform_driver *drv = to_platform_driver(_dev->driver);
 446         struct platform_device *dev = to_platform_device(_dev);
 447
 448         return drv->probe(dev);
 449 }
 450
 451 static int platform_drv_probe_fail(struct device *_dev)
 452 {
 453         return -ENXIO;
 454 }
 455
 456 static int platform_drv_remove(struct device *_dev)
 457 {
 458         struct platform_driver *drv = to_platform_driver(_dev->driver);
 459         struct platform_device *dev = to_platform_device(_dev);
 460
 461         return drv->remove(dev);
 462 }
 463
 464 static void platform_drv_shutdown(struct device *_dev)
 465 {
 466         struct platform_driver *drv = to_platform_driver(_dev->driver);
 467         struct platform_device *dev = to_platform_device(_dev);
 468
 469         drv->shutdown(dev);
 470 }
 471
 472 static int platform_drv_suspend(struct device *_dev, pm_message_t state)
 473 {
 474         struct platform_driver *drv = to_platform_driver(_dev->driver);
 475         struct platform_device *dev = to_platform_device(_dev);
 476
 477         return drv->suspend(dev, state);
 478 }
 479
 480 static int platform_drv_resume(struct device *_dev)
 481 {
 482         struct platform_driver *drv = to_platform_driver(_dev->driver);
 483         struct platform_device *dev = to_platform_device(_dev);
 484
 485         return drv->resume(dev);
 486 }
 487
 488 /**
 489  * platform_driver_register
 490  * @drv: platform driver structure
 491  */
 492 int platform_driver_register(struct platform_driver *drv)
 493 {
 494         drv->driver.bus = &platform_bus_type;
 495         if (drv->probe)
 496                 drv->driver.probe = platform_drv_probe;
 497         if (drv->remove)
 498                 drv->driver.remove = platform_drv_remove;
 499         if (drv->shutdown)
 500                 drv->driver.shutdown = platform_drv_shutdown;
 501         if (drv->suspend)
 502                 drv->driver.suspend = platform_drv_suspend;
 503         if (drv->resume)
 504                 drv->driver.resume = platform_drv_resume;
 505         return driver_register(&drv->driver);
 506 }
 507 EXPORT_SYMBOL_GPL(platform_driver_register);
 508
 509 /**
 510  * platform_driver_unregister
 511  * @drv: platform driver structure
 512  */
 513 void platform_driver_unregister(struct platform_driver *drv)
 514 {
 515         driver_unregister(&drv->driver);
 516 }
 517 EXPORT_SYMBOL_GPL(platform_driver_unregister);
 518
 519 /**
 520  * platform_driver_probe - register driver for non-hotpluggable device
 521  * @drv: platform driver structure
 522  * @probe: the driver probe routine, probably from an __init section
 523  *
 524  * Use this instead of platform_driver_register() when you know the device
 525  * is not hotpluggable and has already been registered, and you want to
 526  * remove its run-once probe() infrastructure from memory after the driver
 527  * has bound to the device.
 528  *
 529  * One typical use for this would be with drivers for controllers integrated
 530  * into system-on-chip processors, where the controller devices have been
 531  * configured as part of board setup.
 532  *
 533  * Returns zero if the driver registered and bound to a device, else returns
 534  * a negative error code and with the driver not registered.
 535  */
 536 int __init_or_module platform_driver_probe(struct platform_driver *drv,
 537                 int (*probe)(struct platform_device *))
 538 {
 539         int retval, code;
 540
 541         /* temporary section violation during probe() */
 542         drv->probe = probe;
 543         retval = code = platform_driver_register(drv);
 544
 545         /* Fixup that section violation, being paranoid about code scanning
 546          * the list of drivers in order to probe new devices.  Check to see
 547          * if the probe was successful, and make sure any forced probes of
 548          * new devices fail.
 549          */
 550         spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
 551         drv->probe = NULL;
 552         if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
 553                 retval = -ENODEV;
 554         drv->driver.probe = platform_drv_probe_fail;
 555         spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
 556
 557         if (code != retval)
 558                 platform_driver_unregister(drv);
 559         return retval;
 560 }
 561 EXPORT_SYMBOL_GPL(platform_driver_probe);
 562
 563 /* modalias support enables more hands-off userspace setup:
 564  * (a) environment variable lets new-style hotplug events work once system is
 565  *     fully running:  "modprobe $MODALIAS"
 566  * (b) sysfs attribute lets new-style coldplug recover from hotplug events
 567  *     mishandled before system is fully running:  "modprobe $(cat modalias)"
 568  */
 569 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 570                              char *buf)
 571 {
 572         struct platform_device  *pdev = to_platform_device(dev);
 573         int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
 574
 575         return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
 576 }
 577
 578 static struct device_attribute platform_dev_attrs[] = {
 579         __ATTR_RO(modalias),
 580         __ATTR_NULL,
 581 };
 582
 583 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
 584 {
 585         struct platform_device  *pdev = to_platform_device(dev);
 586
 587         add_uevent_var(env, "MODALIAS=platform:%s", pdev->name);
 588         return 0;
 589 }
 590
 591 /**
 592  * platform_match - bind platform device to platform driver.
 593  * @dev: device.
 594  * @drv: driver.
 595  *
 596  * Platform device IDs are assumed to be encoded like this:
 597  * "<name><instance>", where <name> is a short description of the type of
 598  * device, like "pci" or "floppy", and <instance> is the enumerated
 599  * instance of the device, like '0' or '42'.  Driver IDs are simply
 600  * "<name>".  So, extract the <name> from the platform_device structure,
 601  * and compare it against the name of the driver. Return whether they match
 602  * or not.
 603  */
 604 static int platform_match(struct device *dev, struct device_driver *drv)
 605 {
 606         struct platform_device *pdev;
 607
 608         pdev = container_of(dev, struct platform_device, dev);
 609         return (strcmp(pdev->name, drv->name) == 0);
 610 }
 611
 612 #ifdef CONFIG_PM_SLEEP
 613
 614 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 615 {
 616         int ret = 0;
 617
 618         if (dev->driver && dev->driver->suspend)
 619                 ret = dev->driver->suspend(dev, mesg);
 620
 621         return ret;
 622 }
 623
 624 static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg)
 625 {
 626         struct platform_driver *drv = to_platform_driver(dev->driver);
 627         struct platform_device *pdev;
 628         int ret = 0;
 629
 630         pdev = container_of(dev, struct platform_device, dev);
 631         if (dev->driver && drv->suspend_late)
 632                 ret = drv->suspend_late(pdev, mesg);
 633
 634         return ret;
 635 }
 636
 637 static int platform_legacy_resume_early(struct device *dev)
 638 {
 639         struct platform_driver *drv = to_platform_driver(dev->driver);
 640         struct platform_device *pdev;
 641         int ret = 0;
 642
 643         pdev = container_of(dev, struct platform_device, dev);
 644         if (dev->driver && drv->resume_early)
 645                 ret = drv->resume_early(pdev);
 646
 647         return ret;
 648 }
 649
 650 static int platform_legacy_resume(struct device *dev)
 651 {
 652         int ret = 0;
 653
 654         if (dev->driver && dev->driver->resume)
 655                 ret = dev->driver->resume(dev);
 656
 657         return ret;
 658 }
 659
 660 static int platform_pm_prepare(struct device *dev)
 661 {
 662         struct device_driver *drv = dev->driver;
 663         int ret = 0;
 664
 665         if (drv && drv->pm && drv->pm->prepare)
 666                 ret = drv->pm->prepare(dev);
 667
 668         return ret;
 669 }
 670
 671 static void platform_pm_complete(struct device *dev)
 672 {
 673         struct device_driver *drv = dev->driver;
 674
 675         if (drv && drv->pm && drv->pm->complete)
 676                 drv->pm->complete(dev);
 677 }
 678
 679 #ifdef CONFIG_SUSPEND
 680
 681 static int platform_pm_suspend(struct device *dev)
 682 {
 683         struct device_driver *drv = dev->driver;
 684         int ret = 0;
 685
 686         if (!drv)
 687                 return 0;
 688
 689         if (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 device_driver *drv = dev->driver;
 702         int ret = 0;
 703
 704         if (!drv)
 705                 return 0;
 706
 707         if (drv->pm) {
 708                 if (drv->pm->suspend_noirq)
 709                         ret = drv->pm->suspend_noirq(dev);
 710         } else {
 711                 ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND);
 712         }
 713
 714         return ret;
 715 }
 716
 717 static int platform_pm_resume(struct device *dev)
 718 {
 719         struct device_driver *drv = dev->driver;
 720         int ret = 0;
 721
 722         if (!drv)
 723                 return 0;
 724
 725         if (drv->pm) {
 726                 if (drv->pm->resume)
 727                         ret = drv->pm->resume(dev);
 728         } else {
 729                 ret = platform_legacy_resume(dev);
 730         }
 731
 732         return ret;
 733 }
 734
 735 static int platform_pm_resume_noirq(struct device *dev)
 736 {
 737         struct device_driver *drv = dev->driver;
 738         int ret = 0;
 739
 740         if (!drv)
 741                 return 0;
 742
 743         if (drv->pm) {
 744                 if (drv->pm->resume_noirq)
 745                         ret = drv->pm->resume_noirq(dev);
 746         } else {
 747                 ret = platform_legacy_resume_early(dev);
 748         }
 749
 750         return ret;
 751 }
 752
 753 #else /* !CONFIG_SUSPEND */
 754
 755 #define platform_pm_suspend             NULL
 756 #define platform_pm_resume              NULL
 757 #define platform_pm_suspend_noirq       NULL
 758 #define platform_pm_resume_noirq        NULL
 759
 760 #endif /* !CONFIG_SUSPEND */
 761
 762 #ifdef CONFIG_HIBERNATION
 763
 764 static int platform_pm_freeze(struct device *dev)
 765 {
 766         struct device_driver *drv = dev->driver;
 767         int ret = 0;
 768
 769         if (!drv)
 770                 return 0;
 771
 772         if (drv->pm) {
 773                 if (drv->pm->freeze)
 774                         ret = drv->pm->freeze(dev);
 775         } else {
 776                 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
 777         }
 778
 779         return ret;
 780 }
 781
 782 static int platform_pm_freeze_noirq(struct device *dev)
 783 {
 784         struct device_driver *drv = dev->driver;
 785         int ret = 0;
 786
 787         if (!drv)
 788                 return 0;
 789
 790         if (drv->pm) {
 791                 if (drv->pm->freeze_noirq)
 792                         ret = drv->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)
 806                 return 0;
 807
 808         if (drv->pm) {
 809                 if (drv->pm->thaw)
 810                         ret = drv->pm->thaw(dev);
 811         } else {
 812                 ret = platform_legacy_resume(dev);
 813         }
 814
 815         return ret;
 816 }
 817
 818 static int platform_pm_thaw_noirq(struct device *dev)
 819 {
 820         struct device_driver *drv = dev->driver;
 821         int ret = 0;
 822
 823         if (!drv)
 824                 return 0;
 825
 826         if (drv->pm) {
 827                 if (drv->pm->thaw_noirq)
 828                         ret = drv->pm->thaw_noirq(dev);
 829         } else {
 830                 ret = platform_legacy_resume_early(dev);
 831         }
 832
 833         return ret;
 834 }
 835
 836 static int platform_pm_poweroff(struct device *dev)
 837 {
 838         struct device_driver *drv = dev->driver;
 839         int ret = 0;
 840
 841         if (!drv)
 842                 return 0;
 843
 844         if (drv->pm) {
 845                 if (drv->pm->poweroff)
 846                         ret = drv->pm->poweroff(dev);
 847         } else {
 848                 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
 849         }
 850
 851         return ret;
 852 }
 853
 854 static int platform_pm_poweroff_noirq(struct device *dev)
 855 {
 856         struct device_driver *drv = dev->driver;
 857         int ret = 0;
 858
 859         if (!drv)
 860                 return 0;
 861
 862         if (drv->pm) {
 863                 if (drv->pm->poweroff_noirq)
 864                         ret = drv->pm->poweroff_noirq(dev);
 865         } else {
 866                 ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE);
 867         }
 868
 869         return ret;
 870 }
 871
 872 static int platform_pm_restore(struct device *dev)
 873 {
 874         struct device_driver *drv = dev->driver;
 875         int ret = 0;
 876
 877         if (!drv)
 878                 return 0;
 879
 880         if (drv->pm) {
 881                 if (drv->pm->restore)
 882                         ret = drv->pm->restore(dev);
 883         } else {
 884                 ret = platform_legacy_resume(dev);
 885         }
 886
 887         return ret;
 888 }
 889
 890 static int platform_pm_restore_noirq(struct device *dev)
 891 {
 892         struct device_driver *drv = dev->driver;
 893         int ret = 0;
 894
 895         if (!drv)
 896                 return 0;
 897
 898         if (drv->pm) {
 899                 if (drv->pm->restore_noirq)
 900                         ret = drv->pm->restore_noirq(dev);
 901         } else {
 902                 ret = platform_legacy_resume_early(dev);
 903         }
 904
 905         return ret;
 906 }
 907
 908 #else /* !CONFIG_HIBERNATION */
 909
 910 #define platform_pm_freeze              NULL
 911 #define platform_pm_thaw                NULL
 912 #define platform_pm_poweroff            NULL
 913 #define platform_pm_restore             NULL
 914 #define platform_pm_freeze_noirq        NULL
 915 #define platform_pm_thaw_noirq          NULL
 916 #define platform_pm_poweroff_noirq      NULL
 917 #define platform_pm_restore_noirq       NULL
 918
 919 #endif /* !CONFIG_HIBERNATION */
 920
 921 static struct dev_pm_ops platform_dev_pm_ops = {
 922         .prepare = platform_pm_prepare,
 923         .complete = platform_pm_complete,
 924         .suspend = platform_pm_suspend,
 925         .resume = platform_pm_resume,
 926         .freeze = platform_pm_freeze,
 927         .thaw = platform_pm_thaw,
 928         .poweroff = platform_pm_poweroff,
 929         .restore = platform_pm_restore,
 930         .suspend_noirq = platform_pm_suspend_noirq,
 931         .resume_noirq = platform_pm_resume_noirq,
 932         .freeze_noirq = platform_pm_freeze_noirq,
 933         .thaw_noirq = platform_pm_thaw_noirq,
 934         .poweroff_noirq = platform_pm_poweroff_noirq,
 935         .restore_noirq = platform_pm_restore_noirq,
 936 };
 937
 938 #define PLATFORM_PM_OPS_PTR     (&platform_dev_pm_ops)
 939
 940 #else /* !CONFIG_PM_SLEEP */
 941
 942 #define PLATFORM_PM_OPS_PTR     NULL
 943
 944 #endif /* !CONFIG_PM_SLEEP */
 945
 946 struct bus_type platform_bus_type = {
 947         .name           = "platform",
 948         .dev_attrs      = platform_dev_attrs,
 949         .match          = platform_match,
 950         .uevent         = platform_uevent,
 951         .pm             = PLATFORM_PM_OPS_PTR,
 952 };
 953 EXPORT_SYMBOL_GPL(platform_bus_type);
 954
 955 int __init platform_bus_init(void)
 956 {
 957         int error;
 958
 959         error = device_register(&platform_bus);
 960         if (error)
 961                 return error;
 962         error =  bus_register(&platform_bus_type);
 963         if (error)
 964                 device_unregister(&platform_bus);
 965         return error;
 966 }
 967
 968 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
 969 u64 dma_get_required_mask(struct device *dev)
 970 {
 971         u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
 972         u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
 973         u64 mask;
 974
 975         if (!high_totalram) {
 976                 /* convert to mask just covering totalram */
 977                 low_totalram = (1 << (fls(low_totalram) - 1));
 978                 low_totalram += low_totalram - 1;
 979                 mask = low_totalram;
 980         } else {
 981                 high_totalram = (1 << (fls(high_totalram) - 1));
 982                 high_totalram += high_totalram - 1;
 983                 mask = (((u64)high_totalram) << 32) + 0xffffffff;
 984         }
 985         return mask;
 986 }
 987 EXPORT_SYMBOL_GPL(dma_get_required_mask);
 988 #endif