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 struct of_device_id __initdata ibmebus_matches[] = {
  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                                     struct dma_attrs *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                                   struct dma_attrs *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                                    struct dma_attrs *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                                struct dma_attrs *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                           struct dma_attrs *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                              struct dma_attrs *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 == NO_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
 296 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 297                                     const char *buf, size_t count)
 298 {
 299         struct device *dev;
 300         char *path;
 301
 302         path = ibmebus_chomp(buf, count);
 303         if (!path)
 304                 return -ENOMEM;
 305
 306         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 307                                    ibmebus_match_path))) {
 308                 of_device_unregister(to_platform_device(dev));
 309
 310                 kfree(path);
 311                 return count;
 312         } else {
 313                 printk(KERN_WARNING "%s: %s not on the bus\n",
 314                        __func__, path);
 315
 316                 kfree(path);
 317                 return -ENODEV;
 318         }
 319 }
 320
 321
 322 static struct bus_attribute ibmebus_bus_attrs[] = {
 323         __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
 324         __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
 325         __ATTR_NULL
 326 };
 327
 328 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
 329 {
 330         const struct of_device_id *matches = drv->of_match_table;
 331
 332         if (!matches)
 333                 return 0;
 334
 335         return of_match_device(matches, dev) != NULL;
 336 }
 337
 338 static int ibmebus_bus_device_probe(struct device *dev)
 339 {
 340         int error = -ENODEV;
 341         struct platform_driver *drv;
 342         struct platform_device *of_dev;
 343
 344         drv = to_platform_driver(dev->driver);
 345         of_dev = to_platform_device(dev);
 346
 347         if (!drv->probe)
 348                 return error;
 349
 350         of_dev_get(of_dev);
 351
 352         if (of_driver_match_device(dev, dev->driver))
 353                 error = drv->probe(of_dev);
 354         if (error)
 355                 of_dev_put(of_dev);
 356
 357         return error;
 358 }
 359
 360 static int ibmebus_bus_device_remove(struct device *dev)
 361 {
 362         struct platform_device *of_dev = to_platform_device(dev);
 363         struct platform_driver *drv = to_platform_driver(dev->driver);
 364
 365         if (dev->driver && drv->remove)
 366                 drv->remove(of_dev);
 367         return 0;
 368 }
 369
 370 static void ibmebus_bus_device_shutdown(struct device *dev)
 371 {
 372         struct platform_device *of_dev = to_platform_device(dev);
 373         struct platform_driver *drv = to_platform_driver(dev->driver);
 374
 375         if (dev->driver && drv->shutdown)
 376                 drv->shutdown(of_dev);
 377 }
 378
 379 /*
 380  * ibmebus_bus_device_attrs
 381  */
 382 static ssize_t devspec_show(struct device *dev,
 383                                 struct device_attribute *attr, char *buf)
 384 {
 385         struct platform_device *ofdev;
 386
 387         ofdev = to_platform_device(dev);
 388         return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
 389 }
 390
 391 static ssize_t name_show(struct device *dev,
 392                                 struct device_attribute *attr, char *buf)
 393 {
 394         struct platform_device *ofdev;
 395
 396         ofdev = to_platform_device(dev);
 397         return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
 398 }
 399
 400 static ssize_t modalias_show(struct device *dev,
 401                                 struct device_attribute *attr, char *buf)
 402 {
 403         ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
 404         buf[len] = '\n';
 405         buf[len+1] = 0;
 406         return len+1;
 407 }
 408
 409 struct device_attribute ibmebus_bus_device_attrs[] = {
 410         __ATTR_RO(devspec),
 411         __ATTR_RO(name),
 412         __ATTR_RO(modalias),
 413         __ATTR_NULL
 414 };
 415
 416 #ifdef CONFIG_PM_SLEEP
 417 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
 418 {
 419         struct platform_device *of_dev = to_platform_device(dev);
 420         struct platform_driver *drv = to_platform_driver(dev->driver);
 421         int ret = 0;
 422
 423         if (dev->driver && drv->suspend)
 424                 ret = drv->suspend(of_dev, mesg);
 425         return ret;
 426 }
 427
 428 static int ibmebus_bus_legacy_resume(struct device *dev)
 429 {
 430         struct platform_device *of_dev = to_platform_device(dev);
 431         struct platform_driver *drv = to_platform_driver(dev->driver);
 432         int ret = 0;
 433
 434         if (dev->driver && drv->resume)
 435                 ret = drv->resume(of_dev);
 436         return ret;
 437 }
 438
 439 static int ibmebus_bus_pm_prepare(struct device *dev)
 440 {
 441         struct device_driver *drv = dev->driver;
 442         int ret = 0;
 443
 444         if (drv && drv->pm && drv->pm->prepare)
 445                 ret = drv->pm->prepare(dev);
 446
 447         return ret;
 448 }
 449
 450 static void ibmebus_bus_pm_complete(struct device *dev)
 451 {
 452         struct device_driver *drv = dev->driver;
 453
 454         if (drv && drv->pm && drv->pm->complete)
 455                 drv->pm->complete(dev);
 456 }
 457
 458 #ifdef CONFIG_SUSPEND
 459
 460 static int ibmebus_bus_pm_suspend(struct device *dev)
 461 {
 462         struct device_driver *drv = dev->driver;
 463         int ret = 0;
 464
 465         if (!drv)
 466                 return 0;
 467
 468         if (drv->pm) {
 469                 if (drv->pm->suspend)
 470                         ret = drv->pm->suspend(dev);
 471         } else {
 472                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
 473         }
 474
 475         return ret;
 476 }
 477
 478 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
 479 {
 480         struct device_driver *drv = dev->driver;
 481         int ret = 0;
 482
 483         if (!drv)
 484                 return 0;
 485
 486         if (drv->pm) {
 487                 if (drv->pm->suspend_noirq)
 488                         ret = drv->pm->suspend_noirq(dev);
 489         }
 490
 491         return ret;
 492 }
 493
 494 static int ibmebus_bus_pm_resume(struct device *dev)
 495 {
 496         struct device_driver *drv = dev->driver;
 497         int ret = 0;
 498
 499         if (!drv)
 500                 return 0;
 501
 502         if (drv->pm) {
 503                 if (drv->pm->resume)
 504                         ret = drv->pm->resume(dev);
 505         } else {
 506                 ret = ibmebus_bus_legacy_resume(dev);
 507         }
 508
 509         return ret;
 510 }
 511
 512 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
 513 {
 514         struct device_driver *drv = dev->driver;
 515         int ret = 0;
 516
 517         if (!drv)
 518                 return 0;
 519
 520         if (drv->pm) {
 521                 if (drv->pm->resume_noirq)
 522                         ret = drv->pm->resume_noirq(dev);
 523         }
 524
 525         return ret;
 526 }
 527
 528 #else /* !CONFIG_SUSPEND */
 529
 530 #define ibmebus_bus_pm_suspend          NULL
 531 #define ibmebus_bus_pm_resume           NULL
 532 #define ibmebus_bus_pm_suspend_noirq    NULL
 533 #define ibmebus_bus_pm_resume_noirq     NULL
 534
 535 #endif /* !CONFIG_SUSPEND */
 536
 537 #ifdef CONFIG_HIBERNATE_CALLBACKS
 538
 539 static int ibmebus_bus_pm_freeze(struct device *dev)
 540 {
 541         struct device_driver *drv = dev->driver;
 542         int ret = 0;
 543
 544         if (!drv)
 545                 return 0;
 546
 547         if (drv->pm) {
 548                 if (drv->pm->freeze)
 549                         ret = drv->pm->freeze(dev);
 550         } else {
 551                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
 552         }
 553
 554         return ret;
 555 }
 556
 557 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
 558 {
 559         struct device_driver *drv = dev->driver;
 560         int ret = 0;
 561
 562         if (!drv)
 563                 return 0;
 564
 565         if (drv->pm) {
 566                 if (drv->pm->freeze_noirq)
 567                         ret = drv->pm->freeze_noirq(dev);
 568         }
 569
 570         return ret;
 571 }
 572
 573 static int ibmebus_bus_pm_thaw(struct device *dev)
 574 {
 575         struct device_driver *drv = dev->driver;
 576         int ret = 0;
 577
 578         if (!drv)
 579                 return 0;
 580
 581         if (drv->pm) {
 582                 if (drv->pm->thaw)
 583                         ret = drv->pm->thaw(dev);
 584         } else {
 585                 ret = ibmebus_bus_legacy_resume(dev);
 586         }
 587
 588         return ret;
 589 }
 590
 591 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
 592 {
 593         struct device_driver *drv = dev->driver;
 594         int ret = 0;
 595
 596         if (!drv)
 597                 return 0;
 598
 599         if (drv->pm) {
 600                 if (drv->pm->thaw_noirq)
 601                         ret = drv->pm->thaw_noirq(dev);
 602         }
 603
 604         return ret;
 605 }
 606
 607 static int ibmebus_bus_pm_poweroff(struct device *dev)
 608 {
 609         struct device_driver *drv = dev->driver;
 610         int ret = 0;
 611
 612         if (!drv)
 613                 return 0;
 614
 615         if (drv->pm) {
 616                 if (drv->pm->poweroff)
 617                         ret = drv->pm->poweroff(dev);
 618         } else {
 619                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
 620         }
 621
 622         return ret;
 623 }
 624
 625 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
 626 {
 627         struct device_driver *drv = dev->driver;
 628         int ret = 0;
 629
 630         if (!drv)
 631                 return 0;
 632
 633         if (drv->pm) {
 634                 if (drv->pm->poweroff_noirq)
 635                         ret = drv->pm->poweroff_noirq(dev);
 636         }
 637
 638         return ret;
 639 }
 640
 641 static int ibmebus_bus_pm_restore(struct device *dev)
 642 {
 643         struct device_driver *drv = dev->driver;
 644         int ret = 0;
 645
 646         if (!drv)
 647                 return 0;
 648
 649         if (drv->pm) {
 650                 if (drv->pm->restore)
 651                         ret = drv->pm->restore(dev);
 652         } else {
 653                 ret = ibmebus_bus_legacy_resume(dev);
 654         }
 655
 656         return ret;
 657 }
 658
 659 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
 660 {
 661         struct device_driver *drv = dev->driver;
 662         int ret = 0;
 663
 664         if (!drv)
 665                 return 0;
 666
 667         if (drv->pm) {
 668                 if (drv->pm->restore_noirq)
 669                         ret = drv->pm->restore_noirq(dev);
 670         }
 671
 672         return ret;
 673 }
 674
 675 #else /* !CONFIG_HIBERNATE_CALLBACKS */
 676
 677 #define ibmebus_bus_pm_freeze           NULL
 678 #define ibmebus_bus_pm_thaw             NULL
 679 #define ibmebus_bus_pm_poweroff         NULL
 680 #define ibmebus_bus_pm_restore          NULL
 681 #define ibmebus_bus_pm_freeze_noirq     NULL
 682 #define ibmebus_bus_pm_thaw_noirq               NULL
 683 #define ibmebus_bus_pm_poweroff_noirq   NULL
 684 #define ibmebus_bus_pm_restore_noirq    NULL
 685
 686 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
 687
 688 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
 689         .prepare = ibmebus_bus_pm_prepare,
 690         .complete = ibmebus_bus_pm_complete,
 691         .suspend = ibmebus_bus_pm_suspend,
 692         .resume = ibmebus_bus_pm_resume,
 693         .freeze = ibmebus_bus_pm_freeze,
 694         .thaw = ibmebus_bus_pm_thaw,
 695         .poweroff = ibmebus_bus_pm_poweroff,
 696         .restore = ibmebus_bus_pm_restore,
 697         .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
 698         .resume_noirq = ibmebus_bus_pm_resume_noirq,
 699         .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
 700         .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
 701         .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
 702         .restore_noirq = ibmebus_bus_pm_restore_noirq,
 703 };
 704
 705 #define IBMEBUS_BUS_PM_OPS_PTR  (&ibmebus_bus_dev_pm_ops)
 706
 707 #else /* !CONFIG_PM_SLEEP */
 708
 709 #define IBMEBUS_BUS_PM_OPS_PTR  NULL
 710
 711 #endif /* !CONFIG_PM_SLEEP */
 712
 713 struct bus_type ibmebus_bus_type = {
 714         .name      = "ibmebus",
 715         .uevent    = of_device_uevent_modalias,
 716         .bus_attrs = ibmebus_bus_attrs,
 717         .match     = ibmebus_bus_bus_match,
 718         .probe     = ibmebus_bus_device_probe,
 719         .remove    = ibmebus_bus_device_remove,
 720         .shutdown  = ibmebus_bus_device_shutdown,
 721         .dev_attrs = ibmebus_bus_device_attrs,
 722         .pm        = IBMEBUS_BUS_PM_OPS_PTR,
 723 };
 724 EXPORT_SYMBOL(ibmebus_bus_type);
 725
 726 static int __init ibmebus_bus_init(void)
 727 {
 728         int err;
 729
 730         printk(KERN_INFO "IBM eBus Device Driver\n");
 731
 732         err = bus_register(&ibmebus_bus_type);
 733         if (err) {
 734                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
 735                        __func__);
 736                 return err;
 737         }
 738
 739         err = device_register(&ibmebus_bus_device);
 740         if (err) {
 741                 printk(KERN_WARNING "%s: device_register returned %i\n",
 742                        __func__, err);
 743                 bus_unregister(&ibmebus_bus_type);
 744
 745                 return err;
 746         }
 747
 748         err = ibmebus_create_devices(ibmebus_matches);
 749         if (err) {
 750                 device_unregister(&ibmebus_bus_device);
 751                 bus_unregister(&ibmebus_bus_type);
 752                 return err;
 753         }
 754
 755         return 0;
 756 }
 757 postcore_initcall(ibmebus_bus_init);