drivers/pci/hotplug/cpci_hotplug_core.c

   1 /*
   2  * CompactPCI Hot Plug Driver
   3  *
   4  * Copyright (C) 2002 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/config.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/slab.h>
  32 #include <linux/pci.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/smp_lock.h>
  36 #include "pci_hotplug.h"
  37 #include "cpci_hotplug.h"
  38
  39 #define DRIVER_VERSION  "0.2"
  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 spinlock_t list_lock;
  57 static LIST_HEAD(slot_list);
  58 static int slots;
  59 int cpci_debug;
  60 static struct cpci_hp_controller *controller;
  61 static struct semaphore event_semaphore;        /* mutex for process loop (up if something to process) */
  62 static struct semaphore thread_exit;            /* guard ensure thread has exited before calling it quits */
  63 static int thread_finished = 1;
  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
  71 static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
  72         .owner = THIS_MODULE,
  73         .enable_slot = enable_slot,
  74         .disable_slot = disable_slot,
  75         .set_attention_status = set_attention_status,
  76         .get_power_status = get_power_status,
  77         .get_attention_status = get_attention_status,
  78 };
  79
  80 static int
  81 update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
  82 {
  83         struct hotplug_slot_info info;
  84
  85         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  86         info.latch_status = value;
  87         return pci_hp_change_slot_info(hotplug_slot, &info);
  88 }
  89
  90 static int
  91 update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
  92 {
  93         struct hotplug_slot_info info;
  94
  95         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  96         info.adapter_status = value;
  97         return pci_hp_change_slot_info(hotplug_slot, &info);
  98 }
  99
 100 static int
 101 enable_slot(struct hotplug_slot *hotplug_slot)
 102 {
 103         struct slot *slot = hotplug_slot->private;
 104         int retval = 0;
 105
 106         dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
 107
 108         if(controller->ops->set_power) {
 109                 retval = controller->ops->set_power(slot, 1);
 110         }
 111
 112         return retval;
 113 }
 114
 115 static int
 116 disable_slot(struct hotplug_slot *hotplug_slot)
 117 {
 118         struct slot *slot = hotplug_slot->private;
 119         int retval = 0;
 120
 121         dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
 122
 123         /* Unconfigure device */
 124         dbg("%s - unconfiguring slot %s",
 125             __FUNCTION__, slot->hotplug_slot->name);
 126         if((retval = cpci_unconfigure_slot(slot))) {
 127                 err("%s - could not unconfigure slot %s",
 128                     __FUNCTION__, slot->hotplug_slot->name);
 129                 return retval;
 130         }
 131         dbg("%s - finished unconfiguring slot %s",
 132             __FUNCTION__, slot->hotplug_slot->name);
 133
 134         /* Clear EXT (by setting it) */
 135         if(cpci_clear_ext(slot)) {
 136                 err("%s - could not clear EXT for slot %s",
 137                     __FUNCTION__, slot->hotplug_slot->name);
 138                 retval = -ENODEV;
 139         }
 140         cpci_led_on(slot);
 141
 142         if(controller->ops->set_power) {
 143                 retval = controller->ops->set_power(slot, 0);
 144         }
 145
 146         if(update_adapter_status(slot->hotplug_slot, 0)) {
 147                 warn("failure to update adapter file");
 148         }
 149
 150         slot->extracting = 0;
 151
 152         return retval;
 153 }
 154
 155 static u8
 156 cpci_get_power_status(struct slot *slot)
 157 {
 158         u8 power = 1;
 159
 160         if(controller->ops->get_power) {
 161                 power = controller->ops->get_power(slot);
 162         }
 163         return power;
 164 }
 165
 166 static int
 167 get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 168 {
 169         struct slot *slot = hotplug_slot->private;
 170
 171         *value = cpci_get_power_status(slot);
 172         return 0;
 173 }
 174
 175 static int
 176 get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 177 {
 178         struct slot *slot = hotplug_slot->private;
 179
 180         *value = cpci_get_attention_status(slot);
 181         return 0;
 182 }
 183
 184 static int
 185 set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 186 {
 187         return cpci_set_attention_status(hotplug_slot->private, status);
 188 }
 189
 190 static void release_slot(struct hotplug_slot *hotplug_slot)
 191 {
 192         struct slot *slot = hotplug_slot->private;
 193
 194         kfree(slot->hotplug_slot->info);
 195         kfree(slot->hotplug_slot->name);
 196         kfree(slot->hotplug_slot);
 197         kfree(slot);
 198 }
 199
 200 #define SLOT_NAME_SIZE  6
 201 static void
 202 make_slot_name(struct slot *slot)
 203 {
 204         snprintf(slot->hotplug_slot->name,
 205                  SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number);
 206 }
 207
 208 int
 209 cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
 210 {
 211         struct slot *slot;
 212         struct hotplug_slot *hotplug_slot;
 213         struct hotplug_slot_info *info;
 214         char *name;
 215         int status = -ENOMEM;
 216         int i;
 217
 218         if(!(controller && bus)) {
 219                 return -ENODEV;
 220         }
 221
 222         /*
 223          * Create a structure for each slot, and register that slot
 224          * with the pci_hotplug subsystem.
 225          */
 226         for (i = first; i <= last; ++i) {
 227                 slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
 228                 if (!slot)
 229                         goto error;
 230                 memset(slot, 0, sizeof (struct slot));
 231
 232                 hotplug_slot =
 233                     kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
 234                 if (!hotplug_slot)
 235                         goto error_slot;
 236                 memset(hotplug_slot, 0, sizeof (struct hotplug_slot));
 237                 slot->hotplug_slot = hotplug_slot;
 238
 239                 info = kmalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
 240                 if (!info)
 241                         goto error_hpslot;
 242                 memset(info, 0, sizeof (struct hotplug_slot_info));
 243                 hotplug_slot->info = info;
 244
 245                 name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
 246                 if (!name)
 247                         goto error_info;
 248                 hotplug_slot->name = name;
 249
 250                 slot->bus = bus;
 251                 slot->number = i;
 252                 slot->devfn = PCI_DEVFN(i, 0);
 253
 254                 hotplug_slot->private = slot;
 255                 hotplug_slot->release = &release_slot;
 256                 make_slot_name(slot);
 257                 hotplug_slot->ops = &cpci_hotplug_slot_ops;
 258
 259                 /*
 260                  * Initialize the slot info structure with some known
 261                  * good values.
 262                  */
 263                 dbg("initializing slot %s", slot->hotplug_slot->name);
 264                 info->power_status = cpci_get_power_status(slot);
 265                 info->attention_status = cpci_get_attention_status(slot);
 266
 267                 dbg("registering slot %s", slot->hotplug_slot->name);
 268                 status = pci_hp_register(slot->hotplug_slot);
 269                 if (status) {
 270                         err("pci_hp_register failed with error %d", status);
 271                         goto error_name;
 272                 }
 273
 274                 /* Add slot to our internal list */
 275                 spin_lock(&list_lock);
 276                 list_add(&slot->slot_list, &slot_list);
 277                 slots++;
 278                 spin_unlock(&list_lock);
 279         }
 280         return 0;
 281 error_name:
 282         kfree(name);
 283 error_info:
 284         kfree(info);
 285 error_hpslot:
 286         kfree(hotplug_slot);
 287 error_slot:
 288         kfree(slot);
 289 error:
 290         return status;
 291 }
 292
 293 int
 294 cpci_hp_unregister_bus(struct pci_bus *bus)
 295 {
 296         struct slot *slot;
 297         struct list_head *tmp;
 298         struct list_head *next;
 299         int status;
 300
 301         spin_lock(&list_lock);
 302         if(!slots) {
 303                 spin_unlock(&list_lock);
 304                 return -1;
 305         }
 306         list_for_each_safe(tmp, next, &slot_list) {
 307                 slot = list_entry(tmp, struct slot, slot_list);
 308                 if(slot->bus == bus) {
 309                         dbg("deregistering slot %s", slot->hotplug_slot->name);
 310                         status = pci_hp_deregister(slot->hotplug_slot);
 311                         if(status) {
 312                                 err("pci_hp_deregister failed with error %d",
 313                                     status);
 314                                 return status;
 315                         }
 316
 317                         list_del(&slot->slot_list);
 318                         slots--;
 319                 }
 320         }
 321         spin_unlock(&list_lock);
 322         return 0;
 323 }
 324
 325 /* This is the interrupt mode interrupt handler */
 326 static irqreturn_t
 327 cpci_hp_intr(int irq, void *data, struct pt_regs *regs)
 328 {
 329         dbg("entered cpci_hp_intr");
 330
 331         /* Check to see if it was our interrupt */
 332         if((controller->irq_flags & SA_SHIRQ) &&
 333             !controller->ops->check_irq(controller->dev_id)) {
 334                 dbg("exited cpci_hp_intr, not our interrupt");
 335                 return IRQ_NONE;
 336         }
 337
 338         /* Disable ENUM interrupt */
 339         controller->ops->disable_irq();
 340
 341         /* Trigger processing by the event thread */
 342         dbg("Signal event_semaphore");
 343         up(&event_semaphore);
 344         dbg("exited cpci_hp_intr");
 345         return IRQ_HANDLED;
 346 }
 347
 348 /*
 349  * According to PICMG 2.12 R2.0, section 6.3.2, upon
 350  * initialization, the system driver shall clear the
 351  * INS bits of the cold-inserted devices.
 352  */
 353 static int
 354 init_slots(void)
 355 {
 356         struct slot *slot;
 357         struct list_head *tmp;
 358         struct pci_dev* dev;
 359
 360         dbg("%s - enter", __FUNCTION__);
 361         spin_lock(&list_lock);
 362         if(!slots) {
 363                 spin_unlock(&list_lock);
 364                 return -1;
 365         }
 366         list_for_each(tmp, &slot_list) {
 367                 slot = list_entry(tmp, struct slot, slot_list);
 368                 dbg("%s - looking at slot %s",
 369                     __FUNCTION__, slot->hotplug_slot->name);
 370                 if(cpci_check_and_clear_ins(slot)) {
 371                         dbg("%s - cleared INS for slot %s",
 372                             __FUNCTION__, slot->hotplug_slot->name);
 373                         dev = pci_find_slot(slot->bus->number, PCI_DEVFN(slot->number, 0));
 374                         if(dev) {
 375                                 if(update_adapter_status(slot->hotplug_slot, 1)) {
 376                                         warn("failure to update adapter file");
 377                                 }
 378                                 if(update_latch_status(slot->hotplug_slot, 1)) {
 379                                         warn("failure to update latch file");
 380                                 }
 381                                 slot->dev = dev;
 382                         } else {
 383                                 err("%s - no driver attached to device in slot %s",
 384                                     __FUNCTION__, slot->hotplug_slot->name);
 385                         }
 386                 }
 387         }
 388         spin_unlock(&list_lock);
 389         dbg("%s - exit", __FUNCTION__);
 390         return 0;
 391 }
 392
 393 static int
 394 check_slots(void)
 395 {
 396         struct slot *slot;
 397         struct list_head *tmp;
 398         int extracted;
 399         int inserted;
 400
 401         spin_lock(&list_lock);
 402         if(!slots) {
 403                 spin_unlock(&list_lock);
 404                 err("no slots registered, shutting down");
 405                 return -1;
 406         }
 407         extracted = inserted = 0;
 408         list_for_each(tmp, &slot_list) {
 409                 slot = list_entry(tmp, struct slot, slot_list);
 410                 dbg("%s - looking at slot %s",
 411                     __FUNCTION__, slot->hotplug_slot->name);
 412                 if(cpci_check_and_clear_ins(slot)) {
 413                         u16 hs_csr;
 414
 415                         /* Some broken hardware (e.g. PLX 9054AB) asserts ENUM# twice... */
 416                         if(slot->dev) {
 417                                 warn("slot %s already inserted", slot->hotplug_slot->name);
 418                                 inserted++;
 419                                 continue;
 420                         }
 421
 422                         /* Process insertion */
 423                         dbg("%s - slot %s inserted",
 424                             __FUNCTION__, slot->hotplug_slot->name);
 425
 426                         /* GSM, debug */
 427                         hs_csr = cpci_get_hs_csr(slot);
 428                         dbg("%s - slot %s HS_CSR (1) = %04x",
 429                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 430
 431                         /* Configure device */
 432                         dbg("%s - configuring slot %s",
 433                             __FUNCTION__, slot->hotplug_slot->name);
 434                         if(cpci_configure_slot(slot)) {
 435                                 err("%s - could not configure slot %s",
 436                                     __FUNCTION__, slot->hotplug_slot->name);
 437                                 continue;
 438                         }
 439                         dbg("%s - finished configuring slot %s",
 440                             __FUNCTION__, slot->hotplug_slot->name);
 441
 442                         /* GSM, debug */
 443                         hs_csr = cpci_get_hs_csr(slot);
 444                         dbg("%s - slot %s HS_CSR (2) = %04x",
 445                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 446
 447                         if(update_latch_status(slot->hotplug_slot, 1)) {
 448                                 warn("failure to update latch file");
 449                         }
 450
 451                         if(update_adapter_status(slot->hotplug_slot, 1)) {
 452                                 warn("failure to update adapter file");
 453                         }
 454
 455                         cpci_led_off(slot);
 456
 457                         /* GSM, debug */
 458                         hs_csr = cpci_get_hs_csr(slot);
 459                         dbg("%s - slot %s HS_CSR (3) = %04x",
 460                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 461
 462                         inserted++;
 463                 } else if(cpci_check_ext(slot)) {
 464                         u16 hs_csr;
 465
 466                         /* Process extraction request */
 467                         dbg("%s - slot %s extracted",
 468                             __FUNCTION__, slot->hotplug_slot->name);
 469
 470                         /* GSM, debug */
 471                         hs_csr = cpci_get_hs_csr(slot);
 472                         dbg("%s - slot %s HS_CSR = %04x",
 473                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 474
 475                         if(!slot->extracting) {
 476                                 if(update_latch_status(slot->hotplug_slot, 0)) {
 477                                         warn("failure to update latch file");
 478                                 }
 479                                 slot->extracting = 1;
 480                         }
 481                         extracted++;
 482                 }
 483         }
 484         spin_unlock(&list_lock);
 485         if(inserted || extracted) {
 486                 return extracted;
 487         }
 488         else {
 489                 err("cannot find ENUM# source, shutting down");
 490                 return -1;
 491         }
 492 }
 493
 494 /* This is the interrupt mode worker thread body */
 495 static int
 496 event_thread(void *data)
 497 {
 498         int rc;
 499         struct slot *slot;
 500         struct list_head *tmp;
 501
 502         lock_kernel();
 503         daemonize("cpci_hp_eventd");
 504         unlock_kernel();
 505
 506         dbg("%s - event thread started", __FUNCTION__);
 507         while(1) {
 508                 dbg("event thread sleeping");
 509                 down_interruptible(&event_semaphore);
 510                 dbg("event thread woken, thread_finished = %d",
 511                     thread_finished);
 512                 if(thread_finished || signal_pending(current))
 513                         break;
 514                 while(controller->ops->query_enum()) {
 515                         rc = check_slots();
 516                         if(rc > 0) {
 517                                 /* Give userspace a chance to handle extraction */
 518                                 set_current_state(TASK_INTERRUPTIBLE);
 519                                 schedule_timeout(HZ / 2);
 520                         } else if(rc < 0) {
 521                                 dbg("%s - error checking slots", __FUNCTION__);
 522                                 thread_finished = 1;
 523                                 break;
 524                         }
 525                 }
 526                 /* Check for someone yanking out a board */
 527                 list_for_each(tmp, &slot_list) {
 528                         slot = list_entry(tmp, struct slot, slot_list);
 529                         if(slot->extracting) {
 530                                 /*
 531                                  * Hmmm, we're likely hosed at this point, should we
 532                                  * bother trying to tell the driver or not?
 533                                  */
 534                                 err("card in slot %s was improperly removed",
 535                                     slot->hotplug_slot->name);
 536                                 if(update_adapter_status(slot->hotplug_slot, 0)) {
 537                                         warn("failure to update adapter file");
 538                                 }
 539                                 slot->extracting = 0;
 540                         }
 541                 }
 542
 543                 /* Re-enable ENUM# interrupt */
 544                 dbg("%s - re-enabling irq", __FUNCTION__);
 545                 controller->ops->enable_irq();
 546         }
 547
 548         dbg("%s - event thread signals exit", __FUNCTION__);
 549         up(&thread_exit);
 550         return 0;
 551 }
 552
 553 /* This is the polling mode worker thread body */
 554 static int
 555 poll_thread(void *data)
 556 {
 557         int rc;
 558         struct slot *slot;
 559         struct list_head *tmp;
 560
 561         lock_kernel();
 562         daemonize("cpci_hp_polld");
 563         unlock_kernel();
 564
 565         while(1) {
 566                 if(thread_finished || signal_pending(current))
 567                         break;
 568
 569                 while(controller->ops->query_enum()) {
 570                         rc = check_slots();
 571                         if(rc > 0) {
 572                                 /* Give userspace a chance to handle extraction */
 573                                 set_current_state(TASK_INTERRUPTIBLE);
 574                                 schedule_timeout(HZ / 2);
 575                         } else if(rc < 0) {
 576                                 dbg("%s - error checking slots", __FUNCTION__);
 577                                 thread_finished = 1;
 578                                 break;
 579                         }
 580                 }
 581                 /* Check for someone yanking out a board */
 582                 list_for_each(tmp, &slot_list) {
 583                         slot = list_entry(tmp, struct slot, slot_list);
 584                         if(slot->extracting) {
 585                                 /*
 586                                  * Hmmm, we're likely hosed at this point, should we
 587                                  * bother trying to tell the driver or not?
 588                                  */
 589                                 err("card in slot %s was improperly removed",
 590                                     slot->hotplug_slot->name);
 591                                 if(update_adapter_status(slot->hotplug_slot, 0)) {
 592                                         warn("failure to update adapter file");
 593                                 }
 594                                 slot->extracting = 0;
 595                         }
 596                 }
 597
 598                 set_current_state(TASK_INTERRUPTIBLE);
 599                 schedule_timeout(HZ / 10);
 600         }
 601         dbg("poll thread signals exit");
 602         up(&thread_exit);
 603         return 0;
 604 }
 605
 606 static int
 607 cpci_start_thread(void)
 608 {
 609         int pid;
 610
 611         /* initialize our semaphores */
 612         init_MUTEX_LOCKED(&event_semaphore);
 613         init_MUTEX_LOCKED(&thread_exit);
 614         thread_finished = 0;
 615
 616         if(controller->irq) {
 617                 pid = kernel_thread(event_thread, 0, 0);
 618         } else {
 619                 pid = kernel_thread(poll_thread, 0, 0);
 620         }
 621         if(pid < 0) {
 622                 err("Can't start up our thread");
 623                 return -1;
 624         }
 625         dbg("Our thread pid = %d", pid);
 626         return 0;
 627 }
 628
 629 static void
 630 cpci_stop_thread(void)
 631 {
 632         thread_finished = 1;
 633         dbg("thread finish command given");
 634         if(controller->irq) {
 635                 up(&event_semaphore);
 636         }
 637         dbg("wait for thread to exit");
 638         down(&thread_exit);
 639 }
 640
 641 int
 642 cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
 643 {
 644         int status = 0;
 645
 646         if(!controller) {
 647                 controller = new_controller;
 648                 if(controller->irq) {
 649                         if(request_irq(controller->irq,
 650                                         cpci_hp_intr,
 651                                         controller->irq_flags,
 652                                         MY_NAME, controller->dev_id)) {
 653                                 err("Can't get irq %d for the hotplug cPCI controller", controller->irq);
 654                                 status = -ENODEV;
 655                         }
 656                         dbg("%s - acquired controller irq %d", __FUNCTION__,
 657                             controller->irq);
 658                 }
 659         } else {
 660                 err("cPCI hotplug controller already registered");
 661                 status = -1;
 662         }
 663         return status;
 664 }
 665
 666 int
 667 cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
 668 {
 669         int status = 0;
 670
 671         if(controller) {
 672                 if(!thread_finished) {
 673                         cpci_stop_thread();
 674                 }
 675                 if(controller->irq) {
 676                         free_irq(controller->irq, controller->dev_id);
 677                 }
 678                 controller = NULL;
 679         } else {
 680                 status = -ENODEV;
 681         }
 682         return status;
 683 }
 684
 685 int
 686 cpci_hp_start(void)
 687 {
 688         static int first = 1;
 689         int status;
 690
 691         dbg("%s - enter", __FUNCTION__);
 692         if(!controller) {
 693                 return -ENODEV;
 694         }
 695
 696         spin_lock(&list_lock);
 697         if(!slots) {
 698                 spin_unlock(&list_lock);
 699                 return -ENODEV;
 700         }
 701         spin_unlock(&list_lock);
 702
 703         if(first) {
 704                 status = init_slots();
 705                 if(status) {
 706                         return status;
 707                 }
 708                 first = 0;
 709         }
 710
 711         status = cpci_start_thread();
 712         if(status) {
 713                 return status;
 714         }
 715         dbg("%s - thread started", __FUNCTION__);
 716
 717         if(controller->irq) {
 718                 /* Start enum interrupt processing */
 719                 dbg("%s - enabling irq", __FUNCTION__);
 720                 controller->ops->enable_irq();
 721         }
 722         dbg("%s - exit", __FUNCTION__);
 723         return 0;
 724 }
 725
 726 int
 727 cpci_hp_stop(void)
 728 {
 729         if(!controller) {
 730                 return -ENODEV;
 731         }
 732
 733         if(controller->irq) {
 734                 /* Stop enum interrupt processing */
 735                 dbg("%s - disabling irq", __FUNCTION__);
 736                 controller->ops->disable_irq();
 737         }
 738         cpci_stop_thread();
 739         return 0;
 740 }
 741
 742 static void __exit
 743 cleanup_slots(void)
 744 {
 745         struct list_head *tmp;
 746         struct slot *slot;
 747
 748         /*
 749          * Unregister all of our slots with the pci_hotplug subsystem,
 750          * and free up all memory that we had allocated.
 751          */
 752         spin_lock(&list_lock);
 753         if(!slots) {
 754                 goto null_cleanup;
 755         }
 756         list_for_each(tmp, &slot_list) {
 757                 slot = list_entry(tmp, struct slot, slot_list);
 758                 list_del(&slot->slot_list);
 759                 pci_hp_deregister(slot->hotplug_slot);
 760                 kfree(slot->hotplug_slot->info);
 761                 kfree(slot->hotplug_slot->name);
 762                 kfree(slot->hotplug_slot);
 763                 kfree(slot);
 764         }
 765       null_cleanup:
 766         spin_unlock(&list_lock);
 767         return;
 768 }
 769
 770 int __init
 771 cpci_hotplug_init(int debug)
 772 {
 773         spin_lock_init(&list_lock);
 774         cpci_debug = debug;
 775
 776         info(DRIVER_DESC " version: " DRIVER_VERSION);
 777         return 0;
 778 }
 779
 780 void __exit
 781 cpci_hotplug_exit(void)
 782 {
 783         /*
 784          * Clean everything up.
 785          */
 786         cleanup_slots();
 787 }
 788
 789 EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
 790 EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
 791 EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
 792 EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
 793 EXPORT_SYMBOL_GPL(cpci_hp_start);
 794 EXPORT_SYMBOL_GPL(cpci_hp_stop);