linux/drivers/base/platform.c
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   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/string.h>
  14#include <linux/platform_device.h>
  15#include <linux/of_device.h>
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/dma-mapping.h>
  19#include <linux/bootmem.h>
  20#include <linux/err.h>
  21#include <linux/slab.h>
  22#include <linux/pm_runtime.h>
  23
  24#include "base.h"
  25
  26#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
  27                                 driver))
  28
  29struct device platform_bus = {
  30        .init_name      = "platform",
  31};
  32EXPORT_SYMBOL_GPL(platform_bus);
  33
  34/**
  35 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
  36 * @pdev: platform device
  37 *
  38 * This is called before platform_device_add() such that any pdev_archdata may
  39 * be setup before the platform_notifier is called.  So if a user needs to
  40 * manipulate any relevant information in the pdev_archdata they can do:
  41 *
  42 *      platform_devic_alloc()
  43 *      ... manipulate ...
  44 *      platform_device_add()
  45 *
  46 * And if they don't care they can just call platform_device_register() and
  47 * everything will just work out.
  48 */
  49void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
  50{
  51}
  52
  53/**
  54 * platform_get_resource - get a resource for a device
  55 * @dev: platform device
  56 * @type: resource type
  57 * @num: resource index
  58 */
  59struct resource *platform_get_resource(struct platform_device *dev,
  60                                       unsigned int type, unsigned int num)
  61{
  62        int i;
  63
  64        for (i = 0; i < dev->num_resources; i++) {
  65                struct resource *r = &dev->resource[i];
  66
  67                if (type == resource_type(r) && num-- == 0)
  68                        return r;
  69        }
  70        return NULL;
  71}
  72EXPORT_SYMBOL_GPL(platform_get_resource);
  73
  74/**
  75 * platform_get_irq - get an IRQ for a device
  76 * @dev: platform device
  77 * @num: IRQ number index
  78 */
  79int platform_get_irq(struct platform_device *dev, unsigned int num)
  80{
  81        struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
  82
  83        return r ? r->start : -ENXIO;
  84}
  85EXPORT_SYMBOL_GPL(platform_get_irq);
  86
  87/**
  88 * platform_get_resource_byname - get a resource for a device by name
  89 * @dev: platform device
  90 * @type: resource type
  91 * @name: resource name
  92 */
  93struct resource *platform_get_resource_byname(struct platform_device *dev,
  94                                              unsigned int type,
  95                                              const char *name)
  96{
  97        int i;
  98
  99        for (i = 0; i < dev->num_resources; i++) {
 100                struct resource *r = &dev->resource[i];
 101
 102                if (type == resource_type(r) && !strcmp(r->name, name))
 103                        return r;
 104        }
 105        return NULL;
 106}
 107EXPORT_SYMBOL_GPL(platform_get_resource_byname);
 108
 109/**
 110 * platform_get_irq - get an IRQ for a device
 111 * @dev: platform device
 112 * @name: IRQ name
 113 */
 114int platform_get_irq_byname(struct platform_device *dev, const char *name)
 115{
 116        struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
 117                                                          name);
 118
 119        return r ? r->start : -ENXIO;
 120}
 121EXPORT_SYMBOL_GPL(platform_get_irq_byname);
 122
 123/**
 124 * platform_add_devices - add a numbers of platform devices
 125 * @devs: array of platform devices to add
 126 * @num: number of platform devices in array
 127 */
 128int platform_add_devices(struct platform_device **devs, int num)
 129{
 130        int i, ret = 0;
 131
 132        for (i = 0; i < num; i++) {
 133                ret = platform_device_register(devs[i]);
 134                if (ret) {
 135                        while (--i >= 0)
 136                                platform_device_unregister(devs[i]);
 137                        break;
 138                }
 139        }
 140
 141        return ret;
 142}
 143EXPORT_SYMBOL_GPL(platform_add_devices);
 144
 145struct platform_object {
 146        struct platform_device pdev;
 147        char name[1];
 148};
 149
 150/**
 151 * platform_device_put - destroy a platform device
 152 * @pdev: platform device to free
 153 *
 154 * Free all memory associated with a platform device.  This function must
 155 * _only_ be externally called in error cases.  All other usage is a bug.
 156 */
 157void platform_device_put(struct platform_device *pdev)
 158{
 159        if (pdev)
 160                put_device(&pdev->dev);
 161}
 162EXPORT_SYMBOL_GPL(platform_device_put);
 163
 164static void platform_device_release(struct device *dev)
 165{
 166        struct platform_object *pa = container_of(dev, struct platform_object,
 167                                                  pdev.dev);
 168
 169        of_device_node_put(&pa->pdev.dev);
 170        kfree(pa->pdev.dev.platform_data);
 171        kfree(pa->pdev.mfd_cell);
 172        kfree(pa->pdev.resource);
 173        kfree(pa);
 174}
 175
 176/**
 177 * platform_device_alloc - create a platform device
 178 * @name: base name of the device we're adding
 179 * @id: instance id
 180 *
 181 * Create a platform device object which can have other objects attached
 182 * to it, and which will have attached objects freed when it is released.
 183 */
 184struct platform_device *platform_device_alloc(const char *name, int id)
 185{
 186        struct platform_object *pa;
 187
 188        pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
 189        if (pa) {
 190                strcpy(pa->name, name);
 191                pa->pdev.name = pa->name;
 192                pa->pdev.id = id;
 193                device_initialize(&pa->pdev.dev);
 194                pa->pdev.dev.release = platform_device_release;
 195                arch_setup_pdev_archdata(&pa->pdev);
 196        }
 197
 198        return pa ? &pa->pdev : NULL;
 199}
 200EXPORT_SYMBOL_GPL(platform_device_alloc);
 201
 202/**
 203 * platform_device_add_resources - add resources to a platform device
 204 * @pdev: platform device allocated by platform_device_alloc to add resources to
 205 * @res: set of resources that needs to be allocated for the device
 206 * @num: number of resources
 207 *
 208 * Add a copy of the resources to the platform device.  The memory
 209 * associated with the resources will be freed when the platform device is
 210 * released.
 211 */
 212int platform_device_add_resources(struct platform_device *pdev,
 213                                  const struct resource *res, unsigned int num)
 214{
 215        struct resource *r = NULL;
 216
 217        if (res) {
 218                r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
 219                if (!r)
 220                        return -ENOMEM;
 221        }
 222
 223        kfree(pdev->resource);
 224        pdev->resource = r;
 225        pdev->num_resources = num;
 226        return 0;
 227}
 228EXPORT_SYMBOL_GPL(platform_device_add_resources);
 229
 230/**
 231 * platform_device_add_data - add platform-specific data to a platform device
 232 * @pdev: platform device allocated by platform_device_alloc to add resources to
 233 * @data: platform specific data for this platform device
 234 * @size: size of platform specific data
 235 *
 236 * Add a copy of platform specific data to the platform device's
 237 * platform_data pointer.  The memory associated with the platform data
 238 * will be freed when the platform device is released.
 239 */
 240int platform_device_add_data(struct platform_device *pdev, const void *data,
 241                             size_t size)
 242{
 243        void *d = NULL;
 244
 245        if (data) {
 246                d = kmemdup(data, size, GFP_KERNEL);
 247                if (!d)
 248                        return -ENOMEM;
 249        }
 250
 251        kfree(pdev->dev.platform_data);
 252        pdev->dev.platform_data = d;
 253        return 0;
 254}
 255EXPORT_SYMBOL_GPL(platform_device_add_data);
 256
 257/**
 258 * platform_device_add - add a platform device to device hierarchy
 259 * @pdev: platform device we're adding
 260 *
 261 * This is part 2 of platform_device_register(), though may be called
 262 * separately _iff_ pdev was allocated by platform_device_alloc().
 263 */
 264int platform_device_add(struct platform_device *pdev)
 265{
 266        int i, ret = 0;
 267
 268        if (!pdev)
 269                return -EINVAL;
 270
 271        if (!pdev->dev.parent)
 272                pdev->dev.parent = &platform_bus;
 273
 274        pdev->dev.bus = &platform_bus_type;
 275
 276        if (pdev->id != -1)
 277                dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
 278        else
 279                dev_set_name(&pdev->dev, "%s", pdev->name);
 280
 281        for (i = 0; i < pdev->num_resources; i++) {
 282                struct resource *p, *r = &pdev->resource[i];
 283
 284                if (r->name == NULL)
 285                        r->name = dev_name(&pdev->dev);
 286
 287                p = r->parent;
 288                if (!p) {
 289                        if (resource_type(r) == IORESOURCE_MEM)
 290                                p = &iomem_resource;
 291                        else if (resource_type(r) == IORESOURCE_IO)
 292                                p = &ioport_resource;
 293                }
 294
 295                if (p && insert_resource(p, r)) {
 296                        printk(KERN_ERR
 297                               "%s: failed to claim resource %d\n",
 298                               dev_name(&pdev->dev), i);
 299                        ret = -EBUSY;
 300                        goto failed;
 301                }
 302        }
 303
 304        pr_debug("Registering platform device '%s'. Parent at %s\n",
 305                 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
 306
 307        ret = device_add(&pdev->dev);
 308        if (ret == 0)
 309                return ret;
 310
 311 failed:
 312        while (--i >= 0) {
 313                struct resource *r = &pdev->resource[i];
 314                unsigned long type = resource_type(r);
 315
 316                if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
 317                        release_resource(r);
 318        }
 319
 320        return ret;
 321}
 322EXPORT_SYMBOL_GPL(platform_device_add);
 323
 324/**
 325 * platform_device_del - remove a platform-level device
 326 * @pdev: platform device we're removing
 327 *
 328 * Note that this function will also release all memory- and port-based
 329 * resources owned by the device (@dev->resource).  This function must
 330 * _only_ be externally called in error cases.  All other usage is a bug.
 331 */
 332void platform_device_del(struct platform_device *pdev)
 333{
 334        int i;
 335
 336        if (pdev) {
 337                device_del(&pdev->dev);
 338
 339                for (i = 0; i < pdev->num_resources; i++) {
 340                        struct resource *r = &pdev->resource[i];
 341                        unsigned long type = resource_type(r);
 342
 343                        if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
 344                                release_resource(r);
 345                }
 346        }
 347}
 348EXPORT_SYMBOL_GPL(platform_device_del);
 349
 350/**
 351 * platform_device_register - add a platform-level device
 352 * @pdev: platform device we're adding
 353 */
 354int platform_device_register(struct platform_device *pdev)
 355{
 356        device_initialize(&pdev->dev);
 357        arch_setup_pdev_archdata(pdev);
 358        return platform_device_add(pdev);
 359}
 360EXPORT_SYMBOL_GPL(platform_device_register);
 361
 362/**
 363 * platform_device_unregister - unregister a platform-level device
 364 * @pdev: platform device we're unregistering
 365 *
 366 * Unregistration is done in 2 steps. First we release all resources
 367 * and remove it from the subsystem, then we drop reference count by
 368 * calling platform_device_put().
 369 */
 370void platform_device_unregister(struct platform_device *pdev)
 371{
 372        platform_device_del(pdev);
 373        platform_device_put(pdev);
 374}
 375EXPORT_SYMBOL_GPL(platform_device_unregister);
 376
 377/**
 378 * platform_device_register_full - add a platform-level device with
 379 * resources and platform-specific data
 380 *
 381 * @pdevinfo: data used to create device
 382 *
 383 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 384 */
 385struct platform_device *platform_device_register_full(
 386                const struct platform_device_info *pdevinfo)
 387{
 388        int ret = -ENOMEM;
 389        struct platform_device *pdev;
 390
 391        pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
 392        if (!pdev)
 393                goto err_alloc;
 394
 395        pdev->dev.parent = pdevinfo->parent;
 396
 397        if (pdevinfo->dma_mask) {
 398                /*
 399                 * This memory isn't freed when the device is put,
 400                 * I don't have a nice idea for that though.  Conceptually
 401                 * dma_mask in struct device should not be a pointer.
 402                 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
 403                 */
 404                pdev->dev.dma_mask =
 405                        kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
 406                if (!pdev->dev.dma_mask)
 407                        goto err;
 408
 409                *pdev->dev.dma_mask = pdevinfo->dma_mask;
 410                pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
 411        }
 412
 413        ret = platform_device_add_resources(pdev,
 414                        pdevinfo->res, pdevinfo->num_res);
 415        if (ret)
 416                goto err;
 417
 418        ret = platform_device_add_data(pdev,
 419                        pdevinfo->data, pdevinfo->size_data);
 420        if (ret)
 421                goto err;
 422
 423        ret = platform_device_add(pdev);
 424        if (ret) {
 425err:
 426                kfree(pdev->dev.dma_mask);
 427
 428err_alloc:
 429                platform_device_put(pdev);
 430                return ERR_PTR(ret);
 431        }
 432
 433        return pdev;
 434}
 435EXPORT_SYMBOL_GPL(platform_device_register_full);
 436
 437static int platform_drv_probe(struct device *_dev)
 438{
 439        struct platform_driver *drv = to_platform_driver(_dev->driver);
 440        struct platform_device *dev = to_platform_device(_dev);
 441
 442        return drv->probe(dev);
 443}
 444
 445static int platform_drv_probe_fail(struct device *_dev)
 446{
 447        return -ENXIO;
 448}
 449
 450static int platform_drv_remove(struct device *_dev)
 451{
 452        struct platform_driver *drv = to_platform_driver(_dev->driver);
 453        struct platform_device *dev = to_platform_device(_dev);
 454
 455        return drv->remove(dev);
 456}
 457
 458static void platform_drv_shutdown(struct device *_dev)
 459{
 460        struct platform_driver *drv = to_platform_driver(_dev->driver);
 461        struct platform_device *dev = to_platform_device(_dev);
 462
 463        drv->shutdown(dev);
 464}
 465
 466/**
 467 * platform_driver_register - register a driver for platform-level devices
 468 * @drv: platform driver structure
 469 */
 470int platform_driver_register(struct platform_driver *drv)
 471{
 472        drv->driver.bus = &platform_bus_type;
 473        if (drv->probe)
 474                drv->driver.probe = platform_drv_probe;
 475        if (drv->remove)
 476                drv->driver.remove = platform_drv_remove;
 477        if (drv->shutdown)
 478                drv->driver.shutdown = platform_drv_shutdown;
 479
 480        return driver_register(&drv->driver);
 481}
 482EXPORT_SYMBOL_GPL(platform_driver_register);
 483
 484/**
 485 * platform_driver_unregister - unregister a driver for platform-level devices
 486 * @drv: platform driver structure
 487 */
 488void platform_driver_unregister(struct platform_driver *drv)
 489{
 490        driver_unregister(&drv->driver);
 491}
 492EXPORT_SYMBOL_GPL(platform_driver_unregister);
 493
 494/**
 495 * platform_driver_probe - register driver for non-hotpluggable device
 496 * @drv: platform driver structure
 497 * @probe: the driver probe routine, probably from an __init section
 498 *
 499 * Use this instead of platform_driver_register() when you know the device
 500 * is not hotpluggable and has already been registered, and you want to
 501 * remove its run-once probe() infrastructure from memory after the driver
 502 * has bound to the device.
 503 *
 504 * One typical use for this would be with drivers for controllers integrated
 505 * into system-on-chip processors, where the controller devices have been
 506 * configured as part of board setup.
 507 *
 508 * Returns zero if the driver registered and bound to a device, else returns
 509 * a negative error code and with the driver not registered.
 510 */
 511int __init_or_module platform_driver_probe(struct platform_driver *drv,
 512                int (*probe)(struct platform_device *))
 513{
 514        int retval, code;
 515
 516        /* make sure driver won't have bind/unbind attributes */
 517        drv->driver.suppress_bind_attrs = true;
 518
 519        /* temporary section violation during probe() */
 520        drv->probe = probe;
 521        retval = code = platform_driver_register(drv);
 522
 523        /*
 524         * Fixup that section violation, being paranoid about code scanning
 525         * the list of drivers in order to probe new devices.  Check to see
 526         * if the probe was successful, and make sure any forced probes of
 527         * new devices fail.
 528         */
 529        spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
 530        drv->probe = NULL;
 531        if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
 532                retval = -ENODEV;
 533        drv->driver.probe = platform_drv_probe_fail;
 534        spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
 535
 536        if (code != retval)
 537                platform_driver_unregister(drv);
 538        return retval;
 539}
 540EXPORT_SYMBOL_GPL(platform_driver_probe);
 541
 542/**
 543 * platform_create_bundle - register driver and create corresponding device
 544 * @driver: platform driver structure
 545 * @probe: the driver probe routine, probably from an __init section
 546 * @res: set of resources that needs to be allocated for the device
 547 * @n_res: number of resources
 548 * @data: platform specific data for this platform device
 549 * @size: size of platform specific data
 550 *
 551 * Use this in legacy-style modules that probe hardware directly and
 552 * register a single platform device and corresponding platform driver.
 553 *
 554 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 555 */
 556struct platform_device * __init_or_module platform_create_bundle(
 557                        struct platform_driver *driver,
 558                        int (*probe)(struct platform_device *),
 559                        struct resource *res, unsigned int n_res,
 560                        const void *data, size_t size)
 561{
 562        struct platform_device *pdev;
 563        int error;
 564
 565        pdev = platform_device_alloc(driver->driver.name, -1);
 566        if (!pdev) {
 567                error = -ENOMEM;
 568                goto err_out;
 569        }
 570
 571        error = platform_device_add_resources(pdev, res, n_res);
 572        if (error)
 573                goto err_pdev_put;
 574
 575        error = platform_device_add_data(pdev, data, size);
 576        if (error)
 577                goto err_pdev_put;
 578
 579        error = platform_device_add(pdev);
 580        if (error)
 581                goto err_pdev_put;
 582
 583        error = platform_driver_probe(driver, probe);
 584        if (error)
 585                goto err_pdev_del;
 586
 587        return pdev;
 588
 589err_pdev_del:
 590        platform_device_del(pdev);
 591err_pdev_put:
 592        platform_device_put(pdev);
 593err_out:
 594        return ERR_PTR(error);
 595}
 596EXPORT_SYMBOL_GPL(platform_create_bundle);
 597
 598/* modalias support enables more hands-off userspace setup:
 599 * (a) environment variable lets new-style hotplug events work once system is
 600 *     fully running:  "modprobe $MODALIAS"
 601 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
 602 *     mishandled before system is fully running:  "modprobe $(cat modalias)"
 603 */
 604static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 605                             char *buf)
 606{
 607        struct platform_device  *pdev = to_platform_device(dev);
 608        int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
 609
 610        return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
 611}
 612
 613static struct device_attribute platform_dev_attrs[] = {
 614        __ATTR_RO(modalias),
 615        __ATTR_NULL,
 616};
 617
 618static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
 619{
 620        struct platform_device  *pdev = to_platform_device(dev);
 621        int rc;
 622
 623        /* Some devices have extra OF data and an OF-style MODALIAS */
 624        rc = of_device_uevent_modalias(dev,env);
 625        if (rc != -ENODEV)
 626                return rc;
 627
 628        add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
 629                        pdev->name);
 630        return 0;
 631}
 632
 633static const struct platform_device_id *platform_match_id(
 634                        const struct platform_device_id *id,
 635                        struct platform_device *pdev)
 636{
 637        while (id->name[0]) {
 638                if (strcmp(pdev->name, id->name) == 0) {
 639                        pdev->id_entry = id;
 640                        return id;
 641                }
 642                id++;
 643        }
 644        return NULL;
 645}
 646
 647/**
 648 * platform_match - bind platform device to platform driver.
 649 * @dev: device.
 650 * @drv: driver.
 651 *
 652 * Platform device IDs are assumed to be encoded like this:
 653 * "<name><instance>", where <name> is a short description of the type of
 654 * device, like "pci" or "floppy", and <instance> is the enumerated
 655 * instance of the device, like '0' or '42'.  Driver IDs are simply
 656 * "<name>".  So, extract the <name> from the platform_device structure,
 657 * and compare it against the name of the driver. Return whether they match
 658 * or not.
 659 */
 660static int platform_match(struct device *dev, struct device_driver *drv)
 661{
 662        struct platform_device *pdev = to_platform_device(dev);
 663        struct platform_driver *pdrv = to_platform_driver(drv);
 664
 665        /* Attempt an OF style match first */
 666        if (of_driver_match_device(dev, drv))
 667                return 1;
 668
 669        /* Then try to match against the id table */
 670        if (pdrv->id_table)
 671                return platform_match_id(pdrv->id_table, pdev) != NULL;
 672
 673        /* fall-back to driver name match */
 674        return (strcmp(pdev->name, drv->name) == 0);
 675}
 676
 677#ifdef CONFIG_PM_SLEEP
 678
 679static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 680{
 681        struct platform_driver *pdrv = to_platform_driver(dev->driver);
 682        struct platform_device *pdev = to_platform_device(dev);
 683        int ret = 0;
 684
 685        if (dev->driver && pdrv->suspend)
 686                ret = pdrv->suspend(pdev, mesg);
 687
 688        return ret;
 689}
 690
 691static int platform_legacy_resume(struct device *dev)
 692{
 693        struct platform_driver *pdrv = to_platform_driver(dev->driver);
 694        struct platform_device *pdev = to_platform_device(dev);
 695        int ret = 0;
 696
 697        if (dev->driver && pdrv->resume)
 698                ret = pdrv->resume(pdev);
 699
 700        return ret;
 701}
 702
 703#endif /* CONFIG_PM_SLEEP */
 704
 705#ifdef CONFIG_SUSPEND
 706
 707int platform_pm_suspend(struct device *dev)
 708{
 709        struct device_driver *drv = dev->driver;
 710        int ret = 0;
 711
 712        if (!drv)
 713                return 0;
 714
 715        if (drv->pm) {
 716                if (drv->pm->suspend)
 717                        ret = drv->pm->suspend(dev);
 718        } else {
 719                ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
 720        }
 721
 722        return ret;
 723}
 724
 725int platform_pm_resume(struct device *dev)
 726{
 727        struct device_driver *drv = dev->driver;
 728        int ret = 0;
 729
 730        if (!drv)
 731                return 0;
 732
 733        if (drv->pm) {
 734                if (drv->pm->resume)
 735                        ret = drv->pm->resume(dev);
 736        } else {
 737                ret = platform_legacy_resume(dev);
 738        }
 739
 740        return ret;
 741}
 742
 743#endif /* CONFIG_SUSPEND */
 744
 745#ifdef CONFIG_HIBERNATE_CALLBACKS
 746
 747int platform_pm_freeze(struct device *dev)
 748{
 749        struct device_driver *drv = dev->driver;
 750        int ret = 0;
 751
 752        if (!drv)
 753                return 0;
 754
 755        if (drv->pm) {
 756                if (drv->pm->freeze)
 757                        ret = drv->pm->freeze(dev);
 758        } else {
 759                ret = platform_legacy_suspend(dev, PMSG_FREEZE);
 760        }
 761
 762        return ret;
 763}
 764
 765int platform_pm_thaw(struct device *dev)
 766{
 767        struct device_driver *drv = dev->driver;
 768        int ret = 0;
 769
 770        if (!drv)
 771                return 0;
 772
 773        if (drv->pm) {
 774                if (drv->pm->thaw)
 775                        ret = drv->pm->thaw(dev);
 776        } else {
 777                ret = platform_legacy_resume(dev);
 778        }
 779
 780        return ret;
 781}
 782
 783int platform_pm_poweroff(struct device *dev)
 784{
 785        struct device_driver *drv = dev->driver;
 786        int ret = 0;
 787
 788        if (!drv)
 789                return 0;
 790
 791        if (drv->pm) {
 792                if (drv->pm->poweroff)
 793                        ret = drv->pm->poweroff(dev);
 794        } else {
 795                ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
 796        }
 797
 798        return ret;
 799}
 800
 801int platform_pm_restore(struct device *dev)
 802{
 803        struct device_driver *drv = dev->driver;
 804        int ret = 0;
 805
 806        if (!drv)
 807                return 0;
 808
 809        if (drv->pm) {
 810                if (drv->pm->restore)
 811                        ret = drv->pm->restore(dev);
 812        } else {
 813                ret = platform_legacy_resume(dev);
 814        }
 815
 816        return ret;
 817}
 818
 819#endif /* CONFIG_HIBERNATE_CALLBACKS */
 820
 821static const struct dev_pm_ops platform_dev_pm_ops = {
 822        .runtime_suspend = pm_generic_runtime_suspend,
 823        .runtime_resume = pm_generic_runtime_resume,
 824        .runtime_idle = pm_generic_runtime_idle,
 825        USE_PLATFORM_PM_SLEEP_OPS
 826};
 827
 828struct bus_type platform_bus_type = {
 829        .name           = "platform",
 830        .dev_attrs      = platform_dev_attrs,
 831        .match          = platform_match,
 832        .uevent         = platform_uevent,
 833        .pm             = &platform_dev_pm_ops,
 834};
 835EXPORT_SYMBOL_GPL(platform_bus_type);
 836
 837int __init platform_bus_init(void)
 838{
 839        int error;
 840
 841        early_platform_cleanup();
 842
 843        error = device_register(&platform_bus);
 844        if (error)
 845                return error;
 846        error =  bus_register(&platform_bus_type);
 847        if (error)
 848                device_unregister(&platform_bus);
 849        return error;
 850}
 851
 852#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
 853u64 dma_get_required_mask(struct device *dev)
 854{
 855        u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
 856        u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
 857        u64 mask;
 858
 859        if (!high_totalram) {
 860                /* convert to mask just covering totalram */
 861                low_totalram = (1 << (fls(low_totalram) - 1));
 862                low_totalram += low_totalram - 1;
 863                mask = low_totalram;
 864        } else {
 865                high_totalram = (1 << (fls(high_totalram) - 1));
 866                high_totalram += high_totalram - 1;
 867                mask = (((u64)high_totalram) << 32) + 0xffffffff;
 868        }
 869        return mask;
 870}
 871EXPORT_SYMBOL_GPL(dma_get_required_mask);
 872#endif
 873
 874static __initdata LIST_HEAD(early_platform_driver_list);
 875static __initdata LIST_HEAD(early_platform_device_list);
 876
 877/**
 878 * early_platform_driver_register - register early platform driver
 879 * @epdrv: early_platform driver structure
 880 * @buf: string passed from early_param()
 881 *
 882 * Helper function for early_platform_init() / early_platform_init_buffer()
 883 */
 884int __init early_platform_driver_register(struct early_platform_driver *epdrv,
 885                                          char *buf)
 886{
 887        char *tmp;
 888        int n;
 889
 890        /* Simply add the driver to the end of the global list.
 891         * Drivers will by default be put on the list in compiled-in order.
 892         */
 893        if (!epdrv->list.next) {
 894                INIT_LIST_HEAD(&epdrv->list);
 895                list_add_tail(&epdrv->list, &early_platform_driver_list);
 896        }
 897
 898        /* If the user has specified device then make sure the driver
 899         * gets prioritized. The driver of the last device specified on
 900         * command line will be put first on the list.
 901         */
 902        n = strlen(epdrv->pdrv->driver.name);
 903        if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
 904                list_move(&epdrv->list, &early_platform_driver_list);
 905
 906                /* Allow passing parameters after device name */
 907                if (buf[n] == '\0' || buf[n] == ',')
 908                        epdrv->requested_id = -1;
 909                else {
 910                        epdrv->requested_id = simple_strtoul(&buf[n + 1],
 911                                                             &tmp, 10);
 912
 913                        if (buf[n] != '.' || (tmp == &buf[n + 1])) {
 914                                epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
 915                                n = 0;
 916                        } else
 917                                n += strcspn(&buf[n + 1], ",") + 1;
 918                }
 919
 920                if (buf[n] == ',')
 921                        n++;
 922
 923                if (epdrv->bufsize) {
 924                        memcpy(epdrv->buffer, &buf[n],
 925                               min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
 926                        epdrv->buffer[epdrv->bufsize - 1] = '\0';
 927                }
 928        }
 929
 930        return 0;
 931}
 932
 933/**
 934 * early_platform_add_devices - adds a number of early platform devices
 935 * @devs: array of early platform devices to add
 936 * @num: number of early platform devices in array
 937 *
 938 * Used by early architecture code to register early platform devices and
 939 * their platform data.
 940 */
 941void __init early_platform_add_devices(struct platform_device **devs, int num)
 942{
 943        struct device *dev;
 944        int i;
 945
 946        /* simply add the devices to list */
 947        for (i = 0; i < num; i++) {
 948                dev = &devs[i]->dev;
 949
 950                if (!dev->devres_head.next) {
 951                        INIT_LIST_HEAD(&dev->devres_head);
 952                        list_add_tail(&dev->devres_head,
 953                                      &early_platform_device_list);
 954                }
 955        }
 956}
 957
 958/**
 959 * early_platform_driver_register_all - register early platform drivers
 960 * @class_str: string to identify early platform driver class
 961 *
 962 * Used by architecture code to register all early platform drivers
 963 * for a certain class. If omitted then only early platform drivers
 964 * with matching kernel command line class parameters will be registered.
 965 */
 966void __init early_platform_driver_register_all(char *class_str)
 967{
 968        /* The "class_str" parameter may or may not be present on the kernel
 969         * command line. If it is present then there may be more than one
 970         * matching parameter.
 971         *
 972         * Since we register our early platform drivers using early_param()
 973         * we need to make sure that they also get registered in the case
 974         * when the parameter is missing from the kernel command line.
 975         *
 976         * We use parse_early_options() to make sure the early_param() gets
 977         * called at least once. The early_param() may be called more than
 978         * once since the name of the preferred device may be specified on
 979         * the kernel command line. early_platform_driver_register() handles
 980         * this case for us.
 981         */
 982        parse_early_options(class_str);
 983}
 984
 985/**
 986 * early_platform_match - find early platform device matching driver
 987 * @epdrv: early platform driver structure
 988 * @id: id to match against
 989 */
 990static  __init struct platform_device *
 991early_platform_match(struct early_platform_driver *epdrv, int id)
 992{
 993        struct platform_device *pd;
 994
 995        list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
 996                if (platform_match(&pd->dev, &epdrv->pdrv->driver))
 997                        if (pd->id == id)
 998                                return pd;
 999
1000        return NULL;
1001}
1002
1003/**
1004 * early_platform_left - check if early platform driver has matching devices
1005 * @epdrv: early platform driver structure
1006 * @id: return true if id or above exists
1007 */
1008static  __init int early_platform_left(struct early_platform_driver *epdrv,
1009                                       int id)
1010{
1011        struct platform_device *pd;
1012
1013        list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1014                if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1015                        if (pd->id >= id)
1016                                return 1;
1017
1018        return 0;
1019}
1020
1021/**
1022 * early_platform_driver_probe_id - probe drivers matching class_str and id
1023 * @class_str: string to identify early platform driver class
1024 * @id: id to match against
1025 * @nr_probe: number of platform devices to successfully probe before exiting
1026 */
1027static int __init early_platform_driver_probe_id(char *class_str,
1028                                                 int id,
1029                                                 int nr_probe)
1030{
1031        struct early_platform_driver *epdrv;
1032        struct platform_device *match;
1033        int match_id;
1034        int n = 0;
1035        int left = 0;
1036
1037        list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1038                /* only use drivers matching our class_str */
1039                if (strcmp(class_str, epdrv->class_str))
1040                        continue;
1041
1042                if (id == -2) {
1043                        match_id = epdrv->requested_id;
1044                        left = 1;
1045
1046                } else {
1047                        match_id = id;
1048                        left += early_platform_left(epdrv, id);
1049
1050                        /* skip requested id */
1051                        switch (epdrv->requested_id) {
1052                        case EARLY_PLATFORM_ID_ERROR:
1053                        case EARLY_PLATFORM_ID_UNSET:
1054                                break;
1055                        default:
1056                                if (epdrv->requested_id == id)
1057                                        match_id = EARLY_PLATFORM_ID_UNSET;
1058                        }
1059                }
1060
1061                switch (match_id) {
1062                case EARLY_PLATFORM_ID_ERROR:
1063                        pr_warning("%s: unable to parse %s parameter\n",
1064                                   class_str, epdrv->pdrv->driver.name);
1065                        /* fall-through */
1066                case EARLY_PLATFORM_ID_UNSET:
1067                        match = NULL;
1068                        break;
1069                default:
1070                        match = early_platform_match(epdrv, match_id);
1071                }
1072
1073                if (match) {
1074                        /*
1075                         * Set up a sensible init_name to enable
1076                         * dev_name() and others to be used before the
1077                         * rest of the driver core is initialized.
1078                         */
1079                        if (!match->dev.init_name && slab_is_available()) {
1080                                if (match->id != -1)
1081                                        match->dev.init_name =
1082                                                kasprintf(GFP_KERNEL, "%s.%d",
1083                                                          match->name,
1084                                                          match->id);
1085                                else
1086                                        match->dev.init_name =
1087                                                kasprintf(GFP_KERNEL, "%s",
1088                                                          match->name);
1089
1090                                if (!match->dev.init_name)
1091                                        return -ENOMEM;
1092                        }
1093
1094                        if (epdrv->pdrv->probe(match))
1095                                pr_warning("%s: unable to probe %s early.\n",
1096                                           class_str, match->name);
1097                        else
1098                                n++;
1099                }
1100
1101                if (n >= nr_probe)
1102                        break;
1103        }
1104
1105        if (left)
1106                return n;
1107        else
1108                return -ENODEV;
1109}
1110
1111/**
1112 * early_platform_driver_probe - probe a class of registered drivers
1113 * @class_str: string to identify early platform driver class
1114 * @nr_probe: number of platform devices to successfully probe before exiting
1115 * @user_only: only probe user specified early platform devices
1116 *
1117 * Used by architecture code to probe registered early platform drivers
1118 * within a certain class. For probe to happen a registered early platform
1119 * device matching a registered early platform driver is needed.
1120 */
1121int __init early_platform_driver_probe(char *class_str,
1122                                       int nr_probe,
1123                                       int user_only)
1124{
1125        int k, n, i;
1126
1127        n = 0;
1128        for (i = -2; n < nr_probe; i++) {
1129                k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1130
1131                if (k < 0)
1132                        break;
1133
1134                n += k;
1135
1136                if (user_only)
1137                        break;
1138        }
1139
1140        return n;
1141}
1142
1143/**
1144 * early_platform_cleanup - clean up early platform code
1145 */
1146void __init early_platform_cleanup(void)
1147{
1148        struct platform_device *pd, *pd2;
1149
1150        /* clean up the devres list used to chain devices */
1151        list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1152                                 dev.devres_head) {
1153                list_del(&pd->dev.devres_head);
1154                memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1155        }
1156}
1157
1158
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