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