arch/powerpc/kernel/ibmebus.c

   1 /*
   2  * IBM PowerPC IBM eBus Infrastructure Support.
   3  *
   4  * Copyright (c) 2005 IBM Corporation
   5  *  Joachim Fenkes <fenkes@de.ibm.com>
   6  *  Heiko J Schick <schickhj@de.ibm.com>
   7  *
   8  * All rights reserved.
   9  *
  10  * This source code is distributed under a dual license of GPL v2.0 and OpenIB
  11  * BSD.
  12  *
  13  * OpenIB BSD License
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions are met:
  17  *
  18  * Redistributions of source code must retain the above copyright notice, this
  19  * list of conditions and the following disclaimer.
  20  *
  21  * Redistributions in binary form must reproduce the above copyright notice,
  22  * this list of conditions and the following disclaimer in the documentation
  23  * and/or other materials
  24  * provided with the distribution.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  27  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  30  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  33  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  34  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36  * POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <linux/init.h>
  40 #include <linux/export.h>
  41 #include <linux/console.h>
  42 #include <linux/kobject.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/of.h>
  46 #include <linux/slab.h>
  47 #include <linux/stat.h>
  48 #include <linux/of_platform.h>
  49 #include <asm/ibmebus.h>
  50
  51 static struct device ibmebus_bus_device = { /* fake "parent" device */
  52         .init_name = "ibmebus",
  53 };
  54
  55 struct bus_type ibmebus_bus_type;
  56
  57 /* These devices will automatically be added to the bus during init */
  58 static const struct of_device_id ibmebus_matches[] __initconst = {
  59         { .compatible = "IBM,lhca" },
  60         { .compatible = "IBM,lhea" },
  61         {},
  62 };
  63
  64 static void *ibmebus_alloc_coherent(struct device *dev,
  65                                     size_t size,
  66                                     dma_addr_t *dma_handle,
  67                                     gfp_t flag,
  68                                     unsigned long attrs)
  69 {
  70         void *mem;
  71
  72         mem = kmalloc(size, flag);
  73         *dma_handle = (dma_addr_t)mem;
  74
  75         return mem;
  76 }
  77
  78 static void ibmebus_free_coherent(struct device *dev,
  79                                   size_t size, void *vaddr,
  80                                   dma_addr_t dma_handle,
  81                                   unsigned long attrs)
  82 {
  83         kfree(vaddr);
  84 }
  85
  86 static dma_addr_t ibmebus_map_page(struct device *dev,
  87                                    struct page *page,
  88                                    unsigned long offset,
  89                                    size_t size,
  90                                    enum dma_data_direction direction,
  91                                    unsigned long attrs)
  92 {
  93         return (dma_addr_t)(page_address(page) + offset);
  94 }
  95
  96 static void ibmebus_unmap_page(struct device *dev,
  97                                dma_addr_t dma_addr,
  98                                size_t size,
  99                                enum dma_data_direction direction,
 100                                unsigned long attrs)
 101 {
 102         return;
 103 }
 104
 105 static int ibmebus_map_sg(struct device *dev,
 106                           struct scatterlist *sgl,
 107                           int nents, enum dma_data_direction direction,
 108                           unsigned long attrs)
 109 {
 110         struct scatterlist *sg;
 111         int i;
 112
 113         for_each_sg(sgl, sg, nents, i) {
 114                 sg->dma_address = (dma_addr_t) sg_virt(sg);
 115                 sg->dma_length = sg->length;
 116         }
 117
 118         return nents;
 119 }
 120
 121 static void ibmebus_unmap_sg(struct device *dev,
 122                              struct scatterlist *sg,
 123                              int nents, enum dma_data_direction direction,
 124                              unsigned long attrs)
 125 {
 126         return;
 127 }
 128
 129 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 130 {
 131         return mask == DMA_BIT_MASK(64);
 132 }
 133
 134 static u64 ibmebus_dma_get_required_mask(struct device *dev)
 135 {
 136         return DMA_BIT_MASK(64);
 137 }
 138
 139 static struct dma_map_ops ibmebus_dma_ops = {
 140         .alloc              = ibmebus_alloc_coherent,
 141         .free               = ibmebus_free_coherent,
 142         .map_sg             = ibmebus_map_sg,
 143         .unmap_sg           = ibmebus_unmap_sg,
 144         .dma_supported      = ibmebus_dma_supported,
 145         .get_required_mask  = ibmebus_dma_get_required_mask,
 146         .map_page           = ibmebus_map_page,
 147         .unmap_page         = ibmebus_unmap_page,
 148 };
 149
 150 static int ibmebus_match_path(struct device *dev, void *data)
 151 {
 152         struct device_node *dn = to_platform_device(dev)->dev.of_node;
 153         return (dn->full_name &&
 154                 (strcasecmp((char *)data, dn->full_name) == 0));
 155 }
 156
 157 static int ibmebus_match_node(struct device *dev, void *data)
 158 {
 159         return to_platform_device(dev)->dev.of_node == data;
 160 }
 161
 162 static int ibmebus_create_device(struct device_node *dn)
 163 {
 164         struct platform_device *dev;
 165         int ret;
 166
 167         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
 168         if (!dev)
 169                 return -ENOMEM;
 170
 171         dev->dev.bus = &ibmebus_bus_type;
 172         dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
 173
 174         ret = of_device_add(dev);
 175         if (ret)
 176                 platform_device_put(dev);
 177         return ret;
 178 }
 179
 180 static int ibmebus_create_devices(const struct of_device_id *matches)
 181 {
 182         struct device_node *root, *child;
 183         int ret = 0;
 184
 185         root = of_find_node_by_path("/");
 186
 187         for_each_child_of_node(root, child) {
 188                 if (!of_match_node(matches, child))
 189                         continue;
 190
 191                 if (bus_find_device(&ibmebus_bus_type, NULL, child,
 192                                     ibmebus_match_node))
 193                         continue;
 194
 195                 ret = ibmebus_create_device(child);
 196                 if (ret) {
 197                         printk(KERN_ERR "%s: failed to create device (%i)",
 198                                __func__, ret);
 199                         of_node_put(child);
 200                         break;
 201                 }
 202         }
 203
 204         of_node_put(root);
 205         return ret;
 206 }
 207
 208 int ibmebus_register_driver(struct platform_driver *drv)
 209 {
 210         /* If the driver uses devices that ibmebus doesn't know, add them */
 211         ibmebus_create_devices(drv->driver.of_match_table);
 212
 213         drv->driver.bus = &ibmebus_bus_type;
 214         return driver_register(&drv->driver);
 215 }
 216 EXPORT_SYMBOL(ibmebus_register_driver);
 217
 218 void ibmebus_unregister_driver(struct platform_driver *drv)
 219 {
 220         driver_unregister(&drv->driver);
 221 }
 222 EXPORT_SYMBOL(ibmebus_unregister_driver);
 223
 224 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 225                         unsigned long irq_flags, const char *devname,
 226                         void *dev_id)
 227 {
 228         unsigned int irq = irq_create_mapping(NULL, ist);
 229
 230         if (!irq)
 231                 return -EINVAL;
 232
 233         return request_irq(irq, handler, irq_flags, devname, dev_id);
 234 }
 235 EXPORT_SYMBOL(ibmebus_request_irq);
 236
 237 void ibmebus_free_irq(u32 ist, void *dev_id)
 238 {
 239         unsigned int irq = irq_find_mapping(NULL, ist);
 240
 241         free_irq(irq, dev_id);
 242         irq_dispose_mapping(irq);
 243 }
 244 EXPORT_SYMBOL(ibmebus_free_irq);
 245
 246 static char *ibmebus_chomp(const char *in, size_t count)
 247 {
 248         char *out = kmalloc(count + 1, GFP_KERNEL);
 249
 250         if (!out)
 251                 return NULL;
 252
 253         memcpy(out, in, count);
 254         out[count] = '\0';
 255         if (out[count - 1] == '\n')
 256                 out[count - 1] = '\0';
 257
 258         return out;
 259 }
 260
 261 static ssize_t ibmebus_store_probe(struct bus_type *bus,
 262                                    const char *buf, size_t count)
 263 {
 264         struct device_node *dn = NULL;
 265         char *path;
 266         ssize_t rc = 0;
 267
 268         path = ibmebus_chomp(buf, count);
 269         if (!path)
 270                 return -ENOMEM;
 271
 272         if (bus_find_device(&ibmebus_bus_type, NULL, path,
 273                             ibmebus_match_path)) {
 274                 printk(KERN_WARNING "%s: %s has already been probed\n",
 275                        __func__, path);
 276                 rc = -EEXIST;
 277                 goto out;
 278         }
 279
 280         if ((dn = of_find_node_by_path(path))) {
 281                 rc = ibmebus_create_device(dn);
 282                 of_node_put(dn);
 283         } else {
 284                 printk(KERN_WARNING "%s: no such device node: %s\n",
 285                        __func__, path);
 286                 rc = -ENODEV;
 287         }
 288
 289 out:
 290         kfree(path);
 291         if (rc)
 292                 return rc;
 293         return count;
 294 }
 295 static BUS_ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe);
 296
 297 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 298                                     const char *buf, size_t count)
 299 {
 300         struct device *dev;
 301         char *path;
 302
 303         path = ibmebus_chomp(buf, count);
 304         if (!path)
 305                 return -ENOMEM;
 306
 307         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 308                                    ibmebus_match_path))) {
 309                 of_device_unregister(to_platform_device(dev));
 310
 311                 kfree(path);
 312                 return count;
 313         } else {
 314                 printk(KERN_WARNING "%s: %s not on the bus\n",
 315                        __func__, path);
 316
 317                 kfree(path);
 318                 return -ENODEV;
 319         }
 320 }
 321 static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove);
 322
 323 static struct attribute *ibmbus_bus_attrs[] = {
 324         &bus_attr_probe.attr,
 325         &bus_attr_remove.attr,
 326         NULL,
 327 };
 328 ATTRIBUTE_GROUPS(ibmbus_bus);
 329
 330 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
 331 {
 332         const struct of_device_id *matches = drv->of_match_table;
 333
 334         if (!matches)
 335                 return 0;
 336
 337         return of_match_device(matches, dev) != NULL;
 338 }
 339
 340 static int ibmebus_bus_device_probe(struct device *dev)
 341 {
 342         int error = -ENODEV;
 343         struct platform_driver *drv;
 344         struct platform_device *of_dev;
 345
 346         drv = to_platform_driver(dev->driver);
 347         of_dev = to_platform_device(dev);
 348
 349         if (!drv->probe)
 350                 return error;
 351
 352         of_dev_get(of_dev);
 353
 354         if (of_driver_match_device(dev, dev->driver))
 355                 error = drv->probe(of_dev);
 356         if (error)
 357                 of_dev_put(of_dev);
 358
 359         return error;
 360 }
 361
 362 static int ibmebus_bus_device_remove(struct device *dev)
 363 {
 364         struct platform_device *of_dev = to_platform_device(dev);
 365         struct platform_driver *drv = to_platform_driver(dev->driver);
 366
 367         if (dev->driver && drv->remove)
 368                 drv->remove(of_dev);
 369         return 0;
 370 }
 371
 372 static void ibmebus_bus_device_shutdown(struct device *dev)
 373 {
 374         struct platform_device *of_dev = to_platform_device(dev);
 375         struct platform_driver *drv = to_platform_driver(dev->driver);
 376
 377         if (dev->driver && drv->shutdown)
 378                 drv->shutdown(of_dev);
 379 }
 380
 381 /*
 382  * ibmebus_bus_device_attrs
 383  */
 384 static ssize_t devspec_show(struct device *dev,
 385                                 struct device_attribute *attr, char *buf)
 386 {
 387         struct platform_device *ofdev;
 388
 389         ofdev = to_platform_device(dev);
 390         return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
 391 }
 392
 393 static ssize_t name_show(struct device *dev,
 394                                 struct device_attribute *attr, char *buf)
 395 {
 396         struct platform_device *ofdev;
 397
 398         ofdev = to_platform_device(dev);
 399         return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
 400 }
 401
 402 static ssize_t modalias_show(struct device *dev,
 403                                 struct device_attribute *attr, char *buf)
 404 {
 405         ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
 406         buf[len] = '\n';
 407         buf[len+1] = 0;
 408         return len+1;
 409 }
 410
 411 static struct device_attribute ibmebus_bus_device_attrs[] = {
 412         __ATTR_RO(devspec),
 413         __ATTR_RO(name),
 414         __ATTR_RO(modalias),
 415         __ATTR_NULL
 416 };
 417
 418 #ifdef CONFIG_PM_SLEEP
 419 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
 420 {
 421         struct platform_device *of_dev = to_platform_device(dev);
 422         struct platform_driver *drv = to_platform_driver(dev->driver);
 423         int ret = 0;
 424
 425         if (dev->driver && drv->suspend)
 426                 ret = drv->suspend(of_dev, mesg);
 427         return ret;
 428 }
 429
 430 static int ibmebus_bus_legacy_resume(struct device *dev)
 431 {
 432         struct platform_device *of_dev = to_platform_device(dev);
 433         struct platform_driver *drv = to_platform_driver(dev->driver);
 434         int ret = 0;
 435
 436         if (dev->driver && drv->resume)
 437                 ret = drv->resume(of_dev);
 438         return ret;
 439 }
 440
 441 static int ibmebus_bus_pm_prepare(struct device *dev)
 442 {
 443         struct device_driver *drv = dev->driver;
 444         int ret = 0;
 445
 446         if (drv && drv->pm && drv->pm->prepare)
 447                 ret = drv->pm->prepare(dev);
 448
 449         return ret;
 450 }
 451
 452 static void ibmebus_bus_pm_complete(struct device *dev)
 453 {
 454         struct device_driver *drv = dev->driver;
 455
 456         if (drv && drv->pm && drv->pm->complete)
 457                 drv->pm->complete(dev);
 458 }
 459
 460 #ifdef CONFIG_SUSPEND
 461
 462 static int ibmebus_bus_pm_suspend(struct device *dev)
 463 {
 464         struct device_driver *drv = dev->driver;
 465         int ret = 0;
 466
 467         if (!drv)
 468                 return 0;
 469
 470         if (drv->pm) {
 471                 if (drv->pm->suspend)
 472                         ret = drv->pm->suspend(dev);
 473         } else {
 474                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
 475         }
 476
 477         return ret;
 478 }
 479
 480 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
 481 {
 482         struct device_driver *drv = dev->driver;
 483         int ret = 0;
 484
 485         if (!drv)
 486                 return 0;
 487
 488         if (drv->pm) {
 489                 if (drv->pm->suspend_noirq)
 490                         ret = drv->pm->suspend_noirq(dev);
 491         }
 492
 493         return ret;
 494 }
 495
 496 static int ibmebus_bus_pm_resume(struct device *dev)
 497 {
 498         struct device_driver *drv = dev->driver;
 499         int ret = 0;
 500
 501         if (!drv)
 502                 return 0;
 503
 504         if (drv->pm) {
 505                 if (drv->pm->resume)
 506                         ret = drv->pm->resume(dev);
 507         } else {
 508                 ret = ibmebus_bus_legacy_resume(dev);
 509         }
 510
 511         return ret;
 512 }
 513
 514 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
 515 {
 516         struct device_driver *drv = dev->driver;
 517         int ret = 0;
 518
 519         if (!drv)
 520                 return 0;
 521
 522         if (drv->pm) {
 523                 if (drv->pm->resume_noirq)
 524                         ret = drv->pm->resume_noirq(dev);
 525         }
 526
 527         return ret;
 528 }
 529
 530 #else /* !CONFIG_SUSPEND */
 531
 532 #define ibmebus_bus_pm_suspend          NULL
 533 #define ibmebus_bus_pm_resume           NULL
 534 #define ibmebus_bus_pm_suspend_noirq    NULL
 535 #define ibmebus_bus_pm_resume_noirq     NULL
 536
 537 #endif /* !CONFIG_SUSPEND */
 538
 539 #ifdef CONFIG_HIBERNATE_CALLBACKS
 540
 541 static int ibmebus_bus_pm_freeze(struct device *dev)
 542 {
 543         struct device_driver *drv = dev->driver;
 544         int ret = 0;
 545
 546         if (!drv)
 547                 return 0;
 548
 549         if (drv->pm) {
 550                 if (drv->pm->freeze)
 551                         ret = drv->pm->freeze(dev);
 552         } else {
 553                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
 554         }
 555
 556         return ret;
 557 }
 558
 559 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
 560 {
 561         struct device_driver *drv = dev->driver;
 562         int ret = 0;
 563
 564         if (!drv)
 565                 return 0;
 566
 567         if (drv->pm) {
 568                 if (drv->pm->freeze_noirq)
 569                         ret = drv->pm->freeze_noirq(dev);
 570         }
 571
 572         return ret;
 573 }
 574
 575 static int ibmebus_bus_pm_thaw(struct device *dev)
 576 {
 577         struct device_driver *drv = dev->driver;
 578         int ret = 0;
 579
 580         if (!drv)
 581                 return 0;
 582
 583         if (drv->pm) {
 584                 if (drv->pm->thaw)
 585                         ret = drv->pm->thaw(dev);
 586         } else {
 587                 ret = ibmebus_bus_legacy_resume(dev);
 588         }
 589
 590         return ret;
 591 }
 592
 593 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
 594 {
 595         struct device_driver *drv = dev->driver;
 596         int ret = 0;
 597
 598         if (!drv)
 599                 return 0;
 600
 601         if (drv->pm) {
 602                 if (drv->pm->thaw_noirq)
 603                         ret = drv->pm->thaw_noirq(dev);
 604         }
 605
 606         return ret;
 607 }
 608
 609 static int ibmebus_bus_pm_poweroff(struct device *dev)
 610 {
 611         struct device_driver *drv = dev->driver;
 612         int ret = 0;
 613
 614         if (!drv)
 615                 return 0;
 616
 617         if (drv->pm) {
 618                 if (drv->pm->poweroff)
 619                         ret = drv->pm->poweroff(dev);
 620         } else {
 621                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
 622         }
 623
 624         return ret;
 625 }
 626
 627 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
 628 {
 629         struct device_driver *drv = dev->driver;
 630         int ret = 0;
 631
 632         if (!drv)
 633                 return 0;
 634
 635         if (drv->pm) {
 636                 if (drv->pm->poweroff_noirq)
 637                         ret = drv->pm->poweroff_noirq(dev);
 638         }
 639
 640         return ret;
 641 }
 642
 643 static int ibmebus_bus_pm_restore(struct device *dev)
 644 {
 645         struct device_driver *drv = dev->driver;
 646         int ret = 0;
 647
 648         if (!drv)
 649                 return 0;
 650
 651         if (drv->pm) {
 652                 if (drv->pm->restore)
 653                         ret = drv->pm->restore(dev);
 654         } else {
 655                 ret = ibmebus_bus_legacy_resume(dev);
 656         }
 657
 658         return ret;
 659 }
 660
 661 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
 662 {
 663         struct device_driver *drv = dev->driver;
 664         int ret = 0;
 665
 666         if (!drv)
 667                 return 0;
 668
 669         if (drv->pm) {
 670                 if (drv->pm->restore_noirq)
 671                         ret = drv->pm->restore_noirq(dev);
 672         }
 673
 674         return ret;
 675 }
 676
 677 #else /* !CONFIG_HIBERNATE_CALLBACKS */
 678
 679 #define ibmebus_bus_pm_freeze           NULL
 680 #define ibmebus_bus_pm_thaw             NULL
 681 #define ibmebus_bus_pm_poweroff         NULL
 682 #define ibmebus_bus_pm_restore          NULL
 683 #define ibmebus_bus_pm_freeze_noirq     NULL
 684 #define ibmebus_bus_pm_thaw_noirq               NULL
 685 #define ibmebus_bus_pm_poweroff_noirq   NULL
 686 #define ibmebus_bus_pm_restore_noirq    NULL
 687
 688 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
 689
 690 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
 691         .prepare = ibmebus_bus_pm_prepare,
 692         .complete = ibmebus_bus_pm_complete,
 693         .suspend = ibmebus_bus_pm_suspend,
 694         .resume = ibmebus_bus_pm_resume,
 695         .freeze = ibmebus_bus_pm_freeze,
 696         .thaw = ibmebus_bus_pm_thaw,
 697         .poweroff = ibmebus_bus_pm_poweroff,
 698         .restore = ibmebus_bus_pm_restore,
 699         .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
 700         .resume_noirq = ibmebus_bus_pm_resume_noirq,
 701         .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
 702         .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
 703         .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
 704         .restore_noirq = ibmebus_bus_pm_restore_noirq,
 705 };
 706
 707 #define IBMEBUS_BUS_PM_OPS_PTR  (&ibmebus_bus_dev_pm_ops)
 708
 709 #else /* !CONFIG_PM_SLEEP */
 710
 711 #define IBMEBUS_BUS_PM_OPS_PTR  NULL
 712
 713 #endif /* !CONFIG_PM_SLEEP */
 714
 715 struct bus_type ibmebus_bus_type = {
 716         .name      = "ibmebus",
 717         .uevent    = of_device_uevent_modalias,
 718         .bus_groups = ibmbus_bus_groups,
 719         .match     = ibmebus_bus_bus_match,
 720         .probe     = ibmebus_bus_device_probe,
 721         .remove    = ibmebus_bus_device_remove,
 722         .shutdown  = ibmebus_bus_device_shutdown,
 723         .dev_attrs = ibmebus_bus_device_attrs,
 724         .pm        = IBMEBUS_BUS_PM_OPS_PTR,
 725 };
 726 EXPORT_SYMBOL(ibmebus_bus_type);
 727
 728 static int __init ibmebus_bus_init(void)
 729 {
 730         int err;
 731
 732         printk(KERN_INFO "IBM eBus Device Driver\n");
 733
 734         err = bus_register(&ibmebus_bus_type);
 735         if (err) {
 736                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
 737                        __func__);
 738                 return err;
 739         }
 740
 741         err = device_register(&ibmebus_bus_device);
 742         if (err) {
 743                 printk(KERN_WARNING "%s: device_register returned %i\n",
 744                        __func__, err);
 745                 bus_unregister(&ibmebus_bus_type);
 746
 747                 return err;
 748         }
 749
 750         err = ibmebus_create_devices(ibmebus_matches);
 751         if (err) {
 752                 device_unregister(&ibmebus_bus_device);
 753                 bus_unregister(&ibmebus_bus_type);
 754                 return err;
 755         }
 756
 757         return 0;
 758 }
 759 postcore_initcall(ibmebus_bus_init);