drivers/pci/hotplug/cpci_hotplug_core.c

   1 /*
   2  * CompactPCI Hot Plug Driver
   3  *
   4  * Copyright (C) 2002,2005 SOMA Networks, Inc.
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <scottm@somanetworks.com>
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/pci.h>
  32 #include <linux/pci_hotplug.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/atomic.h>
  36 #include <linux/delay.h>
  37 #include <linux/kthread.h>
  38 #include "cpci_hotplug.h"
  39
  40 #define DRIVER_AUTHOR   "Scott Murray <scottm@somanetworks.com>"
  41 #define DRIVER_DESC     "CompactPCI Hot Plug Core"
  42
  43 #define MY_NAME "cpci_hotplug"
  44
  45 #define dbg(format, arg...)                                     \
  46         do {                                                    \
  47                 if (cpci_debug)                                 \
  48                         printk (KERN_DEBUG "%s: " format "\n",  \
  49                                 MY_NAME , ## arg);              \
  50         } while (0)
  51 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
  52 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
  53 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
  54
  55 /* local variables */
  56 static DECLARE_RWSEM(list_rwsem);
  57 static LIST_HEAD(slot_list);
  58 static int slots;
  59 static atomic_t extracting;
  60 int cpci_debug;
  61 static struct cpci_hp_controller *controller;
  62 static struct task_struct *cpci_thread;
  63 static int thread_finished;
  64
  65 static int enable_slot(struct hotplug_slot *slot);
  66 static int disable_slot(struct hotplug_slot *slot);
  67 static int set_attention_status(struct hotplug_slot *slot, u8 value);
  68 static int get_power_status(struct hotplug_slot *slot, u8 * value);
  69 static int get_attention_status(struct hotplug_slot *slot, u8 * value);
  70 static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
  71 static int get_latch_status(struct hotplug_slot *slot, u8 * value);
  72
  73 static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
  74         .enable_slot = enable_slot,
  75         .disable_slot = disable_slot,
  76         .set_attention_status = set_attention_status,
  77         .get_power_status = get_power_status,
  78         .get_attention_status = get_attention_status,
  79         .get_adapter_status = get_adapter_status,
  80         .get_latch_status = get_latch_status,
  81 };
  82
  83 static int
  84 update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
  85 {
  86         struct hotplug_slot_info info;
  87
  88         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  89         info.latch_status = value;
  90         return pci_hp_change_slot_info(hotplug_slot, &info);
  91 }
  92
  93 static int
  94 update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
  95 {
  96         struct hotplug_slot_info info;
  97
  98         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  99         info.adapter_status = value;
 100         return pci_hp_change_slot_info(hotplug_slot, &info);
 101 }
 102
 103 static int
 104 enable_slot(struct hotplug_slot *hotplug_slot)
 105 {
 106         struct slot *slot = hotplug_slot->private;
 107         int retval = 0;
 108
 109         dbg("%s - physical_slot = %s", __func__, slot_name(slot));
 110
 111         if (controller->ops->set_power)
 112                 retval = controller->ops->set_power(slot, 1);
 113         return retval;
 114 }
 115
 116 static int
 117 disable_slot(struct hotplug_slot *hotplug_slot)
 118 {
 119         struct slot *slot = hotplug_slot->private;
 120         int retval = 0;
 121
 122         dbg("%s - physical_slot = %s", __func__, slot_name(slot));
 123
 124         down_write(&list_rwsem);
 125
 126         /* Unconfigure device */
 127         dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));
 128         if ((retval = cpci_unconfigure_slot(slot))) {
 129                 err("%s - could not unconfigure slot %s",
 130                     __func__, slot_name(slot));
 131                 goto disable_error;
 132         }
 133         dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot));
 134
 135         /* Clear EXT (by setting it) */
 136         if (cpci_clear_ext(slot)) {
 137                 err("%s - could not clear EXT for slot %s",
 138                     __func__, slot_name(slot));
 139                 retval = -ENODEV;
 140                 goto disable_error;
 141         }
 142         cpci_led_on(slot);
 143
 144         if (controller->ops->set_power)
 145                 if ((retval = controller->ops->set_power(slot, 0)))
 146                         goto disable_error;
 147
 148         if (update_adapter_status(slot->hotplug_slot, 0))
 149                 warn("failure to update adapter file");
 150
 151         if (slot->extracting) {
 152                 slot->extracting = 0;
 153                 atomic_dec(&extracting);
 154         }
 155 disable_error:
 156         up_write(&list_rwsem);
 157         return retval;
 158 }
 159
 160 static u8
 161 cpci_get_power_status(struct slot *slot)
 162 {
 163         u8 power = 1;
 164
 165         if (controller->ops->get_power)
 166                 power = controller->ops->get_power(slot);
 167         return power;
 168 }
 169
 170 static int
 171 get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 172 {
 173         struct slot *slot = hotplug_slot->private;
 174
 175         *value = cpci_get_power_status(slot);
 176         return 0;
 177 }
 178
 179 static int
 180 get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 181 {
 182         struct slot *slot = hotplug_slot->private;
 183
 184         *value = cpci_get_attention_status(slot);
 185         return 0;
 186 }
 187
 188 static int
 189 set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 190 {
 191         return cpci_set_attention_status(hotplug_slot->private, status);
 192 }
 193
 194 static int
 195 get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 196 {
 197         *value = hotplug_slot->info->adapter_status;
 198         return 0;
 199 }
 200
 201 static int
 202 get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value)
 203 {
 204         *value = hotplug_slot->info->latch_status;
 205         return 0;
 206 }
 207
 208 static void release_slot(struct hotplug_slot *hotplug_slot)
 209 {
 210         struct slot *slot = hotplug_slot->private;
 211
 212         kfree(slot->hotplug_slot->info);
 213         kfree(slot->hotplug_slot);
 214         if (slot->dev)
 215                 pci_dev_put(slot->dev);
 216         kfree(slot);
 217 }
 218
 219 #define SLOT_NAME_SIZE  6
 220
 221 int
 222 cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
 223 {
 224         struct slot *slot;
 225         struct hotplug_slot *hotplug_slot;
 226         struct hotplug_slot_info *info;
 227         char name[SLOT_NAME_SIZE];
 228         int status;
 229         int i;
 230
 231         if (!(controller && bus))
 232                 return -ENODEV;
 233
 234         /*
 235          * Create a structure for each slot, and register that slot
 236          * with the pci_hotplug subsystem.
 237          */
 238         for (i = first; i <= last; ++i) {
 239                 slot = kzalloc(sizeof (struct slot), GFP_KERNEL);
 240                 if (!slot) {
 241                         status = -ENOMEM;
 242                         goto error;
 243                 }
 244
 245                 hotplug_slot =
 246                         kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
 247                 if (!hotplug_slot) {
 248                         status = -ENOMEM;
 249                         goto error_slot;
 250                 }
 251                 slot->hotplug_slot = hotplug_slot;
 252
 253                 info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
 254                 if (!info) {
 255                         status = -ENOMEM;
 256                         goto error_hpslot;
 257                 }
 258                 hotplug_slot->info = info;
 259
 260                 slot->bus = bus;
 261                 slot->number = i;
 262                 slot->devfn = PCI_DEVFN(i, 0);
 263
 264                 snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i);
 265
 266                 hotplug_slot->private = slot;
 267                 hotplug_slot->release = &release_slot;
 268                 hotplug_slot->ops = &cpci_hotplug_slot_ops;
 269
 270                 /*
 271                  * Initialize the slot info structure with some known
 272                  * good values.
 273                  */
 274                 dbg("initializing slot %s", name);
 275                 info->power_status = cpci_get_power_status(slot);
 276                 info->attention_status = cpci_get_attention_status(slot);
 277
 278                 dbg("registering slot %s", name);
 279                 status = pci_hp_register(slot->hotplug_slot, bus, i, name);
 280                 if (status) {
 281                         err("pci_hp_register failed with error %d", status);
 282                         goto error_info;
 283                 }
 284                 dbg("slot registered with name: %s", slot_name(slot));
 285
 286                 /* Add slot to our internal list */
 287                 down_write(&list_rwsem);
 288                 list_add(&slot->slot_list, &slot_list);
 289                 slots++;
 290                 up_write(&list_rwsem);
 291         }
 292         return 0;
 293 error_info:
 294         kfree(info);
 295 error_hpslot:
 296         kfree(hotplug_slot);
 297 error_slot:
 298         kfree(slot);
 299 error:
 300         return status;
 301 }
 302 EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
 303
 304 int
 305 cpci_hp_unregister_bus(struct pci_bus *bus)
 306 {
 307         struct slot *slot;
 308         struct slot *tmp;
 309         int status = 0;
 310
 311         down_write(&list_rwsem);
 312         if (!slots) {
 313                 up_write(&list_rwsem);
 314                 return -1;
 315         }
 316         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
 317                 if (slot->bus == bus) {
 318                         list_del(&slot->slot_list);
 319                         slots--;
 320
 321                         dbg("deregistering slot %s", slot_name(slot));
 322                         status = pci_hp_deregister(slot->hotplug_slot);
 323                         if (status) {
 324                                 err("pci_hp_deregister failed with error %d",
 325                                     status);
 326                                 break;
 327                         }
 328                 }
 329         }
 330         up_write(&list_rwsem);
 331         return status;
 332 }
 333 EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
 334
 335 /* This is the interrupt mode interrupt handler */
 336 static irqreturn_t
 337 cpci_hp_intr(int irq, void *data)
 338 {
 339         dbg("entered cpci_hp_intr");
 340
 341         /* Check to see if it was our interrupt */
 342         if ((controller->irq_flags & IRQF_SHARED) &&
 343             !controller->ops->check_irq(controller->dev_id)) {
 344                 dbg("exited cpci_hp_intr, not our interrupt");
 345                 return IRQ_NONE;
 346         }
 347
 348         /* Disable ENUM interrupt */
 349         controller->ops->disable_irq();
 350
 351         /* Trigger processing by the event thread */
 352         wake_up_process(cpci_thread);
 353         return IRQ_HANDLED;
 354 }
 355
 356 /*
 357  * According to PICMG 2.1 R2.0, section 6.3.2, upon
 358  * initialization, the system driver shall clear the
 359  * INS bits of the cold-inserted devices.
 360  */
 361 static int
 362 init_slots(int clear_ins)
 363 {
 364         struct slot *slot;
 365         struct pci_dev* dev;
 366
 367         dbg("%s - enter", __func__);
 368         down_read(&list_rwsem);
 369         if (!slots) {
 370                 up_read(&list_rwsem);
 371                 return -1;
 372         }
 373         list_for_each_entry(slot, &slot_list, slot_list) {
 374                 dbg("%s - looking at slot %s", __func__, slot_name(slot));
 375                 if (clear_ins && cpci_check_and_clear_ins(slot))
 376                         dbg("%s - cleared INS for slot %s",
 377                             __func__, slot_name(slot));
 378                 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
 379                 if (dev) {
 380                         if (update_adapter_status(slot->hotplug_slot, 1))
 381                                 warn("failure to update adapter file");
 382                         if (update_latch_status(slot->hotplug_slot, 1))
 383                                 warn("failure to update latch file");
 384                         slot->dev = dev;
 385                 }
 386         }
 387         up_read(&list_rwsem);
 388         dbg("%s - exit", __func__);
 389         return 0;
 390 }
 391
 392 static int
 393 check_slots(void)
 394 {
 395         struct slot *slot;
 396         int extracted;
 397         int inserted;
 398         u16 hs_csr;
 399
 400         down_read(&list_rwsem);
 401         if (!slots) {
 402                 up_read(&list_rwsem);
 403                 err("no slots registered, shutting down");
 404                 return -1;
 405         }
 406         extracted = inserted = 0;
 407         list_for_each_entry(slot, &slot_list, slot_list) {
 408                 dbg("%s - looking at slot %s", __func__, slot_name(slot));
 409                 if (cpci_check_and_clear_ins(slot)) {
 410                         /*
 411                          * Some broken hardware (e.g. PLX 9054AB) asserts
 412                          * ENUM# twice...
 413                          */
 414                         if (slot->dev) {
 415                                 warn("slot %s already inserted",
 416                                      slot_name(slot));
 417                                 inserted++;
 418                                 continue;
 419                         }
 420
 421                         /* Process insertion */
 422                         dbg("%s - slot %s inserted", __func__, slot_name(slot));
 423
 424                         /* GSM, debug */
 425                         hs_csr = cpci_get_hs_csr(slot);
 426                         dbg("%s - slot %s HS_CSR (1) = %04x",
 427                             __func__, slot_name(slot), hs_csr);
 428
 429                         /* Configure device */
 430                         dbg("%s - configuring slot %s",
 431                             __func__, slot_name(slot));
 432                         if (cpci_configure_slot(slot)) {
 433                                 err("%s - could not configure slot %s",
 434                                     __func__, slot_name(slot));
 435                                 continue;
 436                         }
 437                         dbg("%s - finished configuring slot %s",
 438                             __func__, slot_name(slot));
 439
 440                         /* GSM, debug */
 441                         hs_csr = cpci_get_hs_csr(slot);
 442                         dbg("%s - slot %s HS_CSR (2) = %04x",
 443                             __func__, slot_name(slot), hs_csr);
 444
 445                         if (update_latch_status(slot->hotplug_slot, 1))
 446                                 warn("failure to update latch file");
 447
 448                         if (update_adapter_status(slot->hotplug_slot, 1))
 449                                 warn("failure to update adapter file");
 450
 451                         cpci_led_off(slot);
 452
 453                         /* GSM, debug */
 454                         hs_csr = cpci_get_hs_csr(slot);
 455                         dbg("%s - slot %s HS_CSR (3) = %04x",
 456                             __func__, slot_name(slot), hs_csr);
 457
 458                         inserted++;
 459                 } else if (cpci_check_ext(slot)) {
 460                         /* Process extraction request */
 461                         dbg("%s - slot %s extracted",
 462                             __func__, slot_name(slot));
 463
 464                         /* GSM, debug */
 465                         hs_csr = cpci_get_hs_csr(slot);
 466                         dbg("%s - slot %s HS_CSR = %04x",
 467                             __func__, slot_name(slot), hs_csr);
 468
 469                         if (!slot->extracting) {
 470                                 if (update_latch_status(slot->hotplug_slot, 0)) {
 471                                         warn("failure to update latch file");
 472                                 }
 473                                 slot->extracting = 1;
 474                                 atomic_inc(&extracting);
 475                         }
 476                         extracted++;
 477                 } else if (slot->extracting) {
 478                         hs_csr = cpci_get_hs_csr(slot);
 479                         if (hs_csr == 0xffff) {
 480                                 /*
 481                                  * Hmmm, we're likely hosed at this point, should we
 482                                  * bother trying to tell the driver or not?
 483                                  */
 484                                 err("card in slot %s was improperly removed",
 485                                     slot_name(slot));
 486                                 if (update_adapter_status(slot->hotplug_slot, 0))
 487                                         warn("failure to update adapter file");
 488                                 slot->extracting = 0;
 489                                 atomic_dec(&extracting);
 490                         }
 491                 }
 492         }
 493         up_read(&list_rwsem);
 494         dbg("inserted=%d, extracted=%d, extracting=%d",
 495             inserted, extracted, atomic_read(&extracting));
 496         if (inserted || extracted)
 497                 return extracted;
 498         else if (!atomic_read(&extracting)) {
 499                 err("cannot find ENUM# source, shutting down");
 500                 return -1;
 501         }
 502         return 0;
 503 }
 504
 505 /* This is the interrupt mode worker thread body */
 506 static int
 507 event_thread(void *data)
 508 {
 509         int rc;
 510
 511         dbg("%s - event thread started", __func__);
 512         while (1) {
 513                 dbg("event thread sleeping");
 514                 set_current_state(TASK_INTERRUPTIBLE);
 515                 schedule();
 516                 if (kthread_should_stop())
 517                         break;
 518                 do {
 519                         rc = check_slots();
 520                         if (rc > 0) {
 521                                 /* Give userspace a chance to handle extraction */
 522                                 msleep(500);
 523                         } else if (rc < 0) {
 524                                 dbg("%s - error checking slots", __func__);
 525                                 thread_finished = 1;
 526                                 goto out;
 527                         }
 528                 } while (atomic_read(&extracting) && !kthread_should_stop());
 529                 if (kthread_should_stop())
 530                         break;
 531
 532                 /* Re-enable ENUM# interrupt */
 533                 dbg("%s - re-enabling irq", __func__);
 534                 controller->ops->enable_irq();
 535         }
 536  out:
 537         return 0;
 538 }
 539
 540 /* This is the polling mode worker thread body */
 541 static int
 542 poll_thread(void *data)
 543 {
 544         int rc;
 545
 546         while (1) {
 547                 if (kthread_should_stop() || signal_pending(current))
 548                         break;
 549                 if (controller->ops->query_enum()) {
 550                         do {
 551                                 rc = check_slots();
 552                                 if (rc > 0) {
 553                                         /* Give userspace a chance to handle extraction */
 554                                         msleep(500);
 555                                 } else if (rc < 0) {
 556                                         dbg("%s - error checking slots", __func__);
 557                                         thread_finished = 1;
 558                                         goto out;
 559                                 }
 560                         } while (atomic_read(&extracting) && !kthread_should_stop());
 561                 }
 562                 msleep(100);
 563         }
 564  out:
 565         return 0;
 566 }
 567
 568 static int
 569 cpci_start_thread(void)
 570 {
 571         if (controller->irq)
 572                 cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
 573         else
 574                 cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
 575         if (IS_ERR(cpci_thread)) {
 576                 err("Can't start up our thread");
 577                 return PTR_ERR(cpci_thread);
 578         }
 579         thread_finished = 0;
 580         return 0;
 581 }
 582
 583 static void
 584 cpci_stop_thread(void)
 585 {
 586         kthread_stop(cpci_thread);
 587         thread_finished = 1;
 588 }
 589
 590 int
 591 cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
 592 {
 593         int status = 0;
 594
 595         if (controller)
 596                 return -1;
 597         if (!(new_controller && new_controller->ops))
 598                 return -EINVAL;
 599         if (new_controller->irq) {
 600                 if (!(new_controller->ops->enable_irq &&
 601                      new_controller->ops->disable_irq))
 602                         status = -EINVAL;
 603                 if (request_irq(new_controller->irq,
 604                                cpci_hp_intr,
 605                                new_controller->irq_flags,
 606                                MY_NAME,
 607                                new_controller->dev_id)) {
 608                         err("Can't get irq %d for the hotplug cPCI controller",
 609                             new_controller->irq);
 610                         status = -ENODEV;
 611                 }
 612                 dbg("%s - acquired controller irq %d",
 613                     __func__, new_controller->irq);
 614         }
 615         if (!status)
 616                 controller = new_controller;
 617         return status;
 618 }
 619 EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
 620
 621 static void
 622 cleanup_slots(void)
 623 {
 624         struct slot *slot;
 625         struct slot *tmp;
 626
 627         /*
 628          * Unregister all of our slots with the pci_hotplug subsystem,
 629          * and free up all memory that we had allocated.
 630          */
 631         down_write(&list_rwsem);
 632         if (!slots)
 633                 goto cleanup_null;
 634         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
 635                 list_del(&slot->slot_list);
 636                 pci_hp_deregister(slot->hotplug_slot);
 637         }
 638 cleanup_null:
 639         up_write(&list_rwsem);
 640         return;
 641 }
 642
 643 int
 644 cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
 645 {
 646         int status = 0;
 647
 648         if (controller) {
 649                 if (!thread_finished)
 650                         cpci_stop_thread();
 651                 if (controller->irq)
 652                         free_irq(controller->irq, controller->dev_id);
 653                 controller = NULL;
 654                 cleanup_slots();
 655         } else
 656                 status = -ENODEV;
 657         return status;
 658 }
 659 EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
 660
 661 int
 662 cpci_hp_start(void)
 663 {
 664         static int first = 1;
 665         int status;
 666
 667         dbg("%s - enter", __func__);
 668         if (!controller)
 669                 return -ENODEV;
 670
 671         down_read(&list_rwsem);
 672         if (list_empty(&slot_list)) {
 673                 up_read(&list_rwsem);
 674                 return -ENODEV;
 675         }
 676         up_read(&list_rwsem);
 677
 678         status = init_slots(first);
 679         if (first)
 680                 first = 0;
 681         if (status)
 682                 return status;
 683
 684         status = cpci_start_thread();
 685         if (status)
 686                 return status;
 687         dbg("%s - thread started", __func__);
 688
 689         if (controller->irq) {
 690                 /* Start enum interrupt processing */
 691                 dbg("%s - enabling irq", __func__);
 692                 controller->ops->enable_irq();
 693         }
 694         dbg("%s - exit", __func__);
 695         return 0;
 696 }
 697 EXPORT_SYMBOL_GPL(cpci_hp_start);
 698
 699 int
 700 cpci_hp_stop(void)
 701 {
 702         if (!controller)
 703                 return -ENODEV;
 704         if (controller->irq) {
 705                 /* Stop enum interrupt processing */
 706                 dbg("%s - disabling irq", __func__);
 707                 controller->ops->disable_irq();
 708         }
 709         cpci_stop_thread();
 710         return 0;
 711 }
 712 EXPORT_SYMBOL_GPL(cpci_hp_stop);
 713
 714 int __init
 715 cpci_hotplug_init(int debug)
 716 {
 717         cpci_debug = debug;
 718         return 0;
 719 }
 720
 721 void __exit
 722 cpci_hotplug_exit(void)
 723 {
 724         /*
 725          * Clean everything up.
 726          */
 727         cpci_hp_stop();
 728         cpci_hp_unregister_controller(controller);
 729 }