drivers/pci/hotplug/pci_hotplug_core.c

   1 /*
   2  * PCI HotPlug Controller Core
   3  *
   4  * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2001-2002 IBM Corp.
   6  *
   7  * All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or (at
  12  * your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  17  * NON INFRINGEMENT.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Send feedback to <kristen.c.accardi@intel.com>
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/kernel.h>
  31 #include <linux/types.h>
  32 #include <linux/list.h>
  33 #include <linux/kobject.h>
  34 #include <linux/sysfs.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/slab.h>
  37 #include <linux/init.h>
  38 #include <linux/mount.h>
  39 #include <linux/namei.h>
  40 #include <linux/mutex.h>
  41 #include <linux/pci.h>
  42 #include <linux/pci_hotplug.h>
  43 #include <asm/uaccess.h>
  44 #include "../pci.h"
  45
  46 #define MY_NAME "pci_hotplug"
  47
  48 #define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
  49 #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
  50 #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
  51 #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
  52
  53
  54 /* local variables */
  55 static int debug;
  56
  57 #define DRIVER_VERSION  "0.5"
  58 #define DRIVER_AUTHOR   "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
  59 #define DRIVER_DESC     "PCI Hot Plug PCI Core"
  60
  61
  62 //////////////////////////////////////////////////////////////////
  63
  64 static LIST_HEAD(pci_hotplug_slot_list);
  65 static DEFINE_MUTEX(pci_hp_mutex);
  66
  67 /* these strings match up with the values in pci_bus_speed */
  68 static char *pci_bus_speed_strings[] = {
  69         "33 MHz PCI",           /* 0x00 */
  70         "66 MHz PCI",           /* 0x01 */
  71         "66 MHz PCIX",          /* 0x02 */
  72         "100 MHz PCIX",         /* 0x03 */
  73         "133 MHz PCIX",         /* 0x04 */
  74         NULL,                   /* 0x05 */
  75         NULL,                   /* 0x06 */
  76         NULL,                   /* 0x07 */
  77         NULL,                   /* 0x08 */
  78         "66 MHz PCIX 266",      /* 0x09 */
  79         "100 MHz PCIX 266",     /* 0x0a */
  80         "133 MHz PCIX 266",     /* 0x0b */
  81         NULL,                   /* 0x0c */
  82         NULL,                   /* 0x0d */
  83         NULL,                   /* 0x0e */
  84         NULL,                   /* 0x0f */
  85         NULL,                   /* 0x10 */
  86         "66 MHz PCIX 533",      /* 0x11 */
  87         "100 MHz PCIX 533",     /* 0x12 */
  88         "133 MHz PCIX 533",     /* 0x13 */
  89         "25 GBps PCI-E",        /* 0x14 */
  90 };
  91
  92 #ifdef CONFIG_HOTPLUG_PCI_CPCI
  93 extern int cpci_hotplug_init(int debug);
  94 extern void cpci_hotplug_exit(void);
  95 #else
  96 static inline int cpci_hotplug_init(int debug) { return 0; }
  97 static inline void cpci_hotplug_exit(void) { }
  98 #endif
  99
 100 /* Weee, fun with macros... */
 101 #define GET_STATUS(name,type)   \
 102 static int get_##name (struct hotplug_slot *slot, type *value)          \
 103 {                                                                       \
 104         struct hotplug_slot_ops *ops = slot->ops;                       \
 105         int retval = 0;                                                 \
 106         if (!try_module_get(ops->owner))                                \
 107                 return -ENODEV;                                         \
 108         if (ops->get_##name)                                            \
 109                 retval = ops->get_##name(slot, value);                  \
 110         else                                                            \
 111                 *value = slot->info->name;                              \
 112         module_put(ops->owner);                                         \
 113         return retval;                                                  \
 114 }
 115
 116 GET_STATUS(power_status, u8)
 117 GET_STATUS(attention_status, u8)
 118 GET_STATUS(latch_status, u8)
 119 GET_STATUS(adapter_status, u8)
 120 GET_STATUS(max_bus_speed, enum pci_bus_speed)
 121 GET_STATUS(cur_bus_speed, enum pci_bus_speed)
 122
 123 static ssize_t power_read_file(struct pci_slot *slot, char *buf)
 124 {
 125         int retval;
 126         u8 value;
 127
 128         retval = get_power_status(slot->hotplug, &value);
 129         if (retval)
 130                 goto exit;
 131         retval = sprintf (buf, "%d\n", value);
 132 exit:
 133         return retval;
 134 }
 135
 136 static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
 137                 size_t count)
 138 {
 139         struct hotplug_slot *slot = pci_slot->hotplug;
 140         unsigned long lpower;
 141         u8 power;
 142         int retval = 0;
 143
 144         lpower = simple_strtoul (buf, NULL, 10);
 145         power = (u8)(lpower & 0xff);
 146         dbg ("power = %d\n", power);
 147
 148         if (!try_module_get(slot->ops->owner)) {
 149                 retval = -ENODEV;
 150                 goto exit;
 151         }
 152         switch (power) {
 153                 case 0:
 154                         if (slot->ops->disable_slot)
 155                                 retval = slot->ops->disable_slot(slot);
 156                         break;
 157
 158                 case 1:
 159                         if (slot->ops->enable_slot)
 160                                 retval = slot->ops->enable_slot(slot);
 161                         break;
 162
 163                 default:
 164                         err ("Illegal value specified for power\n");
 165                         retval = -EINVAL;
 166         }
 167         module_put(slot->ops->owner);
 168
 169 exit:
 170         if (retval)
 171                 return retval;
 172         return count;
 173 }
 174
 175 static struct pci_slot_attribute hotplug_slot_attr_power = {
 176         .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 177         .show = power_read_file,
 178         .store = power_write_file
 179 };
 180
 181 static ssize_t attention_read_file(struct pci_slot *slot, char *buf)
 182 {
 183         int retval;
 184         u8 value;
 185
 186         retval = get_attention_status(slot->hotplug, &value);
 187         if (retval)
 188                 goto exit;
 189         retval = sprintf(buf, "%d\n", value);
 190
 191 exit:
 192         return retval;
 193 }
 194
 195 static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
 196                 size_t count)
 197 {
 198         struct hotplug_slot_ops *ops = slot->hotplug->ops;
 199         unsigned long lattention;
 200         u8 attention;
 201         int retval = 0;
 202
 203         lattention = simple_strtoul (buf, NULL, 10);
 204         attention = (u8)(lattention & 0xff);
 205         dbg (" - attention = %d\n", attention);
 206
 207         if (!try_module_get(ops->owner)) {
 208                 retval = -ENODEV;
 209                 goto exit;
 210         }
 211         if (ops->set_attention_status)
 212                 retval = ops->set_attention_status(slot->hotplug, attention);
 213         module_put(ops->owner);
 214
 215 exit:
 216         if (retval)
 217                 return retval;
 218         return count;
 219 }
 220
 221 static struct pci_slot_attribute hotplug_slot_attr_attention = {
 222         .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 223         .show = attention_read_file,
 224         .store = attention_write_file
 225 };
 226
 227 static ssize_t latch_read_file(struct pci_slot *slot, char *buf)
 228 {
 229         int retval;
 230         u8 value;
 231
 232         retval = get_latch_status(slot->hotplug, &value);
 233         if (retval)
 234                 goto exit;
 235         retval = sprintf (buf, "%d\n", value);
 236
 237 exit:
 238         return retval;
 239 }
 240
 241 static struct pci_slot_attribute hotplug_slot_attr_latch = {
 242         .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
 243         .show = latch_read_file,
 244 };
 245
 246 static ssize_t presence_read_file(struct pci_slot *slot, char *buf)
 247 {
 248         int retval;
 249         u8 value;
 250
 251         retval = get_adapter_status(slot->hotplug, &value);
 252         if (retval)
 253                 goto exit;
 254         retval = sprintf (buf, "%d\n", value);
 255
 256 exit:
 257         return retval;
 258 }
 259
 260 static struct pci_slot_attribute hotplug_slot_attr_presence = {
 261         .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
 262         .show = presence_read_file,
 263 };
 264
 265 static char *unknown_speed = "Unknown bus speed";
 266
 267 static ssize_t max_bus_speed_read_file(struct pci_slot *slot, char *buf)
 268 {
 269         char *speed_string;
 270         int retval;
 271         enum pci_bus_speed value;
 272
 273         retval = get_max_bus_speed(slot->hotplug, &value);
 274         if (retval)
 275                 goto exit;
 276
 277         if (value == PCI_SPEED_UNKNOWN)
 278                 speed_string = unknown_speed;
 279         else
 280                 speed_string = pci_bus_speed_strings[value];
 281
 282         retval = sprintf (buf, "%s\n", speed_string);
 283
 284 exit:
 285         return retval;
 286 }
 287
 288 static struct pci_slot_attribute hotplug_slot_attr_max_bus_speed = {
 289         .attr = {.name = "max_bus_speed", .mode = S_IFREG | S_IRUGO},
 290         .show = max_bus_speed_read_file,
 291 };
 292
 293 static ssize_t cur_bus_speed_read_file(struct pci_slot *slot, char *buf)
 294 {
 295         char *speed_string;
 296         int retval;
 297         enum pci_bus_speed value;
 298
 299         retval = get_cur_bus_speed(slot->hotplug, &value);
 300         if (retval)
 301                 goto exit;
 302
 303         if (value == PCI_SPEED_UNKNOWN)
 304                 speed_string = unknown_speed;
 305         else
 306                 speed_string = pci_bus_speed_strings[value];
 307
 308         retval = sprintf (buf, "%s\n", speed_string);
 309
 310 exit:
 311         return retval;
 312 }
 313
 314 static struct pci_slot_attribute hotplug_slot_attr_cur_bus_speed = {
 315         .attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO},
 316         .show = cur_bus_speed_read_file,
 317 };
 318
 319 static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
 320                 size_t count)
 321 {
 322         struct hotplug_slot *slot = pci_slot->hotplug;
 323         unsigned long ltest;
 324         u32 test;
 325         int retval = 0;
 326
 327         ltest = simple_strtoul (buf, NULL, 10);
 328         test = (u32)(ltest & 0xffffffff);
 329         dbg ("test = %d\n", test);
 330
 331         if (!try_module_get(slot->ops->owner)) {
 332                 retval = -ENODEV;
 333                 goto exit;
 334         }
 335         if (slot->ops->hardware_test)
 336                 retval = slot->ops->hardware_test(slot, test);
 337         module_put(slot->ops->owner);
 338
 339 exit:
 340         if (retval)
 341                 return retval;
 342         return count;
 343 }
 344
 345 static struct pci_slot_attribute hotplug_slot_attr_test = {
 346         .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 347         .store = test_write_file
 348 };
 349
 350 static int has_power_file(struct pci_slot *pci_slot)
 351 {
 352         struct hotplug_slot *slot = pci_slot->hotplug;
 353         if ((!slot) || (!slot->ops))
 354                 return -ENODEV;
 355         if ((slot->ops->enable_slot) ||
 356             (slot->ops->disable_slot) ||
 357             (slot->ops->get_power_status))
 358                 return 0;
 359         return -ENOENT;
 360 }
 361
 362 static int has_attention_file(struct pci_slot *pci_slot)
 363 {
 364         struct hotplug_slot *slot = pci_slot->hotplug;
 365         if ((!slot) || (!slot->ops))
 366                 return -ENODEV;
 367         if ((slot->ops->set_attention_status) ||
 368             (slot->ops->get_attention_status))
 369                 return 0;
 370         return -ENOENT;
 371 }
 372
 373 static int has_latch_file(struct pci_slot *pci_slot)
 374 {
 375         struct hotplug_slot *slot = pci_slot->hotplug;
 376         if ((!slot) || (!slot->ops))
 377                 return -ENODEV;
 378         if (slot->ops->get_latch_status)
 379                 return 0;
 380         return -ENOENT;
 381 }
 382
 383 static int has_adapter_file(struct pci_slot *pci_slot)
 384 {
 385         struct hotplug_slot *slot = pci_slot->hotplug;
 386         if ((!slot) || (!slot->ops))
 387                 return -ENODEV;
 388         if (slot->ops->get_adapter_status)
 389                 return 0;
 390         return -ENOENT;
 391 }
 392
 393 static int has_max_bus_speed_file(struct pci_slot *pci_slot)
 394 {
 395         struct hotplug_slot *slot = pci_slot->hotplug;
 396         if ((!slot) || (!slot->ops))
 397                 return -ENODEV;
 398         if (slot->ops->get_max_bus_speed)
 399                 return 0;
 400         return -ENOENT;
 401 }
 402
 403 static int has_cur_bus_speed_file(struct pci_slot *pci_slot)
 404 {
 405         struct hotplug_slot *slot = pci_slot->hotplug;
 406         if ((!slot) || (!slot->ops))
 407                 return -ENODEV;
 408         if (slot->ops->get_cur_bus_speed)
 409                 return 0;
 410         return -ENOENT;
 411 }
 412
 413 static int has_test_file(struct pci_slot *pci_slot)
 414 {
 415         struct hotplug_slot *slot = pci_slot->hotplug;
 416         if ((!slot) || (!slot->ops))
 417                 return -ENODEV;
 418         if (slot->ops->hardware_test)
 419                 return 0;
 420         return -ENOENT;
 421 }
 422
 423 static int fs_add_slot(struct pci_slot *slot)
 424 {
 425         int retval = 0;
 426
 427         if (has_power_file(slot) == 0) {
 428                 retval = sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 429                 if (retval)
 430                         goto exit_power;
 431         }
 432
 433         if (has_attention_file(slot) == 0) {
 434                 retval = sysfs_create_file(&slot->kobj,
 435                                            &hotplug_slot_attr_attention.attr);
 436                 if (retval)
 437                         goto exit_attention;
 438         }
 439
 440         if (has_latch_file(slot) == 0) {
 441                 retval = sysfs_create_file(&slot->kobj,
 442                                            &hotplug_slot_attr_latch.attr);
 443                 if (retval)
 444                         goto exit_latch;
 445         }
 446
 447         if (has_adapter_file(slot) == 0) {
 448                 retval = sysfs_create_file(&slot->kobj,
 449                                            &hotplug_slot_attr_presence.attr);
 450                 if (retval)
 451                         goto exit_adapter;
 452         }
 453
 454         if (has_max_bus_speed_file(slot) == 0) {
 455                 retval = sysfs_create_file(&slot->kobj,
 456                                            &hotplug_slot_attr_max_bus_speed.attr);
 457                 if (retval)
 458                         goto exit_max_speed;
 459         }
 460
 461         if (has_cur_bus_speed_file(slot) == 0) {
 462                 retval = sysfs_create_file(&slot->kobj,
 463                                            &hotplug_slot_attr_cur_bus_speed.attr);
 464                 if (retval)
 465                         goto exit_cur_speed;
 466         }
 467
 468         if (has_test_file(slot) == 0) {
 469                 retval = sysfs_create_file(&slot->kobj,
 470                                            &hotplug_slot_attr_test.attr);
 471                 if (retval)
 472                         goto exit_test;
 473         }
 474
 475         goto exit;
 476
 477 exit_test:
 478         if (has_cur_bus_speed_file(slot) == 0)
 479                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
 480
 481 exit_cur_speed:
 482         if (has_max_bus_speed_file(slot) == 0)
 483                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
 484
 485 exit_max_speed:
 486         if (has_adapter_file(slot) == 0)
 487                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
 488
 489 exit_adapter:
 490         if (has_latch_file(slot) == 0)
 491                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
 492
 493 exit_latch:
 494         if (has_attention_file(slot) == 0)
 495                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
 496
 497 exit_attention:
 498         if (has_power_file(slot) == 0)
 499                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 500 exit_power:
 501 exit:
 502         return retval;
 503 }
 504
 505 static void fs_remove_slot(struct pci_slot *slot)
 506 {
 507         if (has_power_file(slot) == 0)
 508                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 509
 510         if (has_attention_file(slot) == 0)
 511                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
 512
 513         if (has_latch_file(slot) == 0)
 514                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
 515
 516         if (has_adapter_file(slot) == 0)
 517                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
 518
 519         if (has_max_bus_speed_file(slot) == 0)
 520                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
 521
 522         if (has_cur_bus_speed_file(slot) == 0)
 523                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
 524
 525         if (has_test_file(slot) == 0)
 526                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
 527 }
 528
 529 static struct hotplug_slot *get_slot_from_name (const char *name)
 530 {
 531         struct hotplug_slot *slot;
 532         struct list_head *tmp;
 533
 534         list_for_each (tmp, &pci_hotplug_slot_list) {
 535                 slot = list_entry (tmp, struct hotplug_slot, slot_list);
 536                 if (strcmp(hotplug_slot_name(slot), name) == 0)
 537                         return slot;
 538         }
 539         return NULL;
 540 }
 541
 542 /**
 543  * pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
 544  * @bus: bus this slot is on
 545  * @slot: pointer to the &struct hotplug_slot to register
 546  * @slot_nr: slot number
 547  * @name: name registered with kobject core
 548  *
 549  * Registers a hotplug slot with the pci hotplug subsystem, which will allow
 550  * userspace interaction to the slot.
 551  *
 552  * Returns 0 if successful, anything else for an error.
 553  */
 554 int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr,
 555                         const char *name)
 556 {
 557         int result;
 558         struct pci_slot *pci_slot;
 559
 560         if (slot == NULL)
 561                 return -ENODEV;
 562         if ((slot->info == NULL) || (slot->ops == NULL))
 563                 return -EINVAL;
 564         if (slot->release == NULL) {
 565                 dbg("Why are you trying to register a hotplug slot "
 566                     "without a proper release function?\n");
 567                 return -EINVAL;
 568         }
 569
 570         mutex_lock(&pci_hp_mutex);
 571
 572         /*
 573          * No problems if we call this interface from both ACPI_PCI_SLOT
 574          * driver and call it here again. If we've already created the
 575          * pci_slot, the interface will simply bump the refcount.
 576          */
 577         pci_slot = pci_create_slot(bus, slot_nr, name, slot);
 578         if (IS_ERR(pci_slot)) {
 579                 result = PTR_ERR(pci_slot);
 580                 goto out;
 581         }
 582
 583         slot->pci_slot = pci_slot;
 584         pci_slot->hotplug = slot;
 585
 586         list_add(&slot->slot_list, &pci_hotplug_slot_list);
 587
 588         result = fs_add_slot(pci_slot);
 589         kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
 590         dbg("Added slot %s to the list\n", name);
 591 out:
 592         mutex_unlock(&pci_hp_mutex);
 593         return result;
 594 }
 595
 596 /**
 597  * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
 598  * @hotplug: pointer to the &struct hotplug_slot to deregister
 599  *
 600  * The @slot must have been registered with the pci hotplug subsystem
 601  * previously with a call to pci_hp_register().
 602  *
 603  * Returns 0 if successful, anything else for an error.
 604  */
 605 int pci_hp_deregister(struct hotplug_slot *hotplug)
 606 {
 607         struct hotplug_slot *temp;
 608         struct pci_slot *slot;
 609
 610         if (!hotplug)
 611                 return -ENODEV;
 612
 613         mutex_lock(&pci_hp_mutex);
 614         temp = get_slot_from_name(hotplug_slot_name(hotplug));
 615         if (temp != hotplug) {
 616                 mutex_unlock(&pci_hp_mutex);
 617                 return -ENODEV;
 618         }
 619
 620         list_del(&hotplug->slot_list);
 621
 622         slot = hotplug->pci_slot;
 623         fs_remove_slot(slot);
 624         dbg("Removed slot %s from the list\n", hotplug_slot_name(hotplug));
 625
 626         hotplug->release(hotplug);
 627         slot->hotplug = NULL;
 628         pci_destroy_slot(slot);
 629         mutex_unlock(&pci_hp_mutex);
 630
 631         return 0;
 632 }
 633
 634 /**
 635  * pci_hp_change_slot_info - changes the slot's information structure in the core
 636  * @hotplug: pointer to the slot whose info has changed
 637  * @info: pointer to the info copy into the slot's info structure
 638  *
 639  * @slot must have been registered with the pci
 640  * hotplug subsystem previously with a call to pci_hp_register().
 641  *
 642  * Returns 0 if successful, anything else for an error.
 643  */
 644 int __must_check pci_hp_change_slot_info(struct hotplug_slot *hotplug,
 645                                          struct hotplug_slot_info *info)
 646 {
 647         struct pci_slot *slot;
 648         if (!hotplug || !info)
 649                 return -ENODEV;
 650         slot = hotplug->pci_slot;
 651
 652         memcpy(hotplug->info, info, sizeof(struct hotplug_slot_info));
 653
 654         return 0;
 655 }
 656
 657 static int __init pci_hotplug_init (void)
 658 {
 659         int result;
 660
 661         result = cpci_hotplug_init(debug);
 662         if (result) {
 663                 err ("cpci_hotplug_init with error %d\n", result);
 664                 goto err_cpci;
 665         }
 666
 667         info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
 668
 669 err_cpci:
 670         return result;
 671 }
 672
 673 static void __exit pci_hotplug_exit (void)
 674 {
 675         cpci_hotplug_exit();
 676 }
 677
 678 module_init(pci_hotplug_init);
 679 module_exit(pci_hotplug_exit);
 680
 681 MODULE_AUTHOR(DRIVER_AUTHOR);
 682 MODULE_DESCRIPTION(DRIVER_DESC);
 683 MODULE_LICENSE("GPL");
 684 module_param(debug, bool, 0644);
 685 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
 686
 687 EXPORT_SYMBOL_GPL(pci_hp_register);
 688 EXPORT_SYMBOL_GPL(pci_hp_deregister);
 689 EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);