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 <greg@kroah.com>
  25  *
  26  * Filesystem portion based on work done by Pat Mochel on ddfs/driverfs
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/list.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/slab.h>
  37 #include <linux/smp_lock.h>
  38 #include <linux/init.h>
  39 #include <linux/mount.h>
  40 #include <linux/namei.h>
  41 #include <linux/pci.h>
  42 #include <asm/uaccess.h>
  43 #include <linux/kobject.h>
  44 #include <linux/sysfs.h>
  45 #include "pci_hotplug.h"
  46
  47
  48 #define MY_NAME "pci_hotplug"
  49
  50 #define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0)
  51 #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
  52 #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
  53 #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
  54
  55
  56 /* local variables */
  57 static int debug;
  58
  59 #define DRIVER_VERSION  "0.5"
  60 #define DRIVER_AUTHOR   "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
  61 #define DRIVER_DESC     "PCI Hot Plug PCI Core"
  62
  63
  64 //////////////////////////////////////////////////////////////////
  65
  66 static LIST_HEAD(pci_hotplug_slot_list);
  67
  68 struct subsystem pci_hotplug_slots_subsys;
  69
  70 static ssize_t hotplug_slot_attr_show(struct kobject *kobj,
  71                 struct attribute *attr, char *buf)
  72 {
  73         struct hotplug_slot *slot = to_hotplug_slot(kobj);
  74         struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
  75         return attribute->show ? attribute->show(slot, buf) : -EIO;
  76 }
  77
  78 static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
  79                 struct attribute *attr, const char *buf, size_t len)
  80 {
  81         struct hotplug_slot *slot = to_hotplug_slot(kobj);
  82         struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
  83         return attribute->store ? attribute->store(slot, buf, len) : -EIO;
  84 }
  85
  86 static struct sysfs_ops hotplug_slot_sysfs_ops = {
  87         .show = hotplug_slot_attr_show,
  88         .store = hotplug_slot_attr_store,
  89 };
  90
  91 static void hotplug_slot_release(struct kobject *kobj)
  92 {
  93         struct hotplug_slot *slot = to_hotplug_slot(kobj);
  94         if (slot->release)
  95                 slot->release(slot);
  96 }
  97
  98 static struct kobj_type hotplug_slot_ktype = {
  99         .sysfs_ops = &hotplug_slot_sysfs_ops,
 100         .release = &hotplug_slot_release,
 101 };
 102
 103 decl_subsys_name(pci_hotplug_slots, slots, &hotplug_slot_ktype, NULL);
 104
 105 /* these strings match up with the values in pci_bus_speed */
 106 static char *pci_bus_speed_strings[] = {
 107         "33 MHz PCI",           /* 0x00 */
 108         "66 MHz PCI",           /* 0x01 */
 109         "66 MHz PCIX",          /* 0x02 */
 110         "100 MHz PCIX",         /* 0x03 */
 111         "133 MHz PCIX",         /* 0x04 */
 112         NULL,                   /* 0x05 */
 113         NULL,                   /* 0x06 */
 114         NULL,                   /* 0x07 */
 115         NULL,                   /* 0x08 */
 116         "66 MHz PCIX 266",      /* 0x09 */
 117         "100 MHz PCIX 266",     /* 0x0a */
 118         "133 MHz PCIX 266",     /* 0x0b */
 119         NULL,                   /* 0x0c */
 120         NULL,                   /* 0x0d */
 121         NULL,                   /* 0x0e */
 122         NULL,                   /* 0x0f */
 123         NULL,                   /* 0x10 */
 124         "66 MHz PCIX 533",      /* 0x11 */
 125         "100 MHz PCIX 533",     /* 0x12 */
 126         "133 MHz PCIX 533",     /* 0x13 */
 127         "25 GBps PCI-E",        /* 0x14 */
 128 };
 129
 130 #ifdef CONFIG_HOTPLUG_PCI_CPCI
 131 extern int cpci_hotplug_init(int debug);
 132 extern void cpci_hotplug_exit(void);
 133 #else
 134 static inline int cpci_hotplug_init(int debug) { return 0; }
 135 static inline void cpci_hotplug_exit(void) { }
 136 #endif
 137
 138 /* Weee, fun with macros... */
 139 #define GET_STATUS(name,type)   \
 140 static int get_##name (struct hotplug_slot *slot, type *value)          \
 141 {                                                                       \
 142         struct hotplug_slot_ops *ops = slot->ops;                       \
 143         int retval = 0;                                                 \
 144         if (try_module_get(ops->owner)) {                               \
 145                 if (ops->get_##name)                                    \
 146                         retval = ops->get_##name (slot, value);         \
 147                 else                                                    \
 148                         *value = slot->info->name;                      \
 149                 module_put(ops->owner);                                 \
 150         }                                                               \
 151         return retval;                                                  \
 152 }
 153
 154 GET_STATUS(power_status, u8)
 155 GET_STATUS(attention_status, u8)
 156 GET_STATUS(latch_status, u8)
 157 GET_STATUS(adapter_status, u8)
 158 GET_STATUS(address, u32)
 159 GET_STATUS(max_bus_speed, enum pci_bus_speed)
 160 GET_STATUS(cur_bus_speed, enum pci_bus_speed)
 161
 162 static ssize_t power_read_file (struct hotplug_slot *slot, char *buf)
 163 {
 164         int retval;
 165         u8 value;
 166
 167         retval = get_power_status (slot, &value);
 168         if (retval)
 169                 goto exit;
 170         retval = sprintf (buf, "%d\n", value);
 171 exit:
 172         return retval;
 173 }
 174
 175 static ssize_t power_write_file (struct hotplug_slot *slot, const char *buf,
 176                 size_t count)
 177 {
 178         unsigned long lpower;
 179         u8 power;
 180         int retval = 0;
 181
 182         lpower = simple_strtoul (buf, NULL, 10);
 183         power = (u8)(lpower & 0xff);
 184         dbg ("power = %d\n", power);
 185
 186         if (!try_module_get(slot->ops->owner)) {
 187                 retval = -ENODEV;
 188                 goto exit;
 189         }
 190         switch (power) {
 191                 case 0:
 192                         if (slot->ops->disable_slot)
 193                                 retval = slot->ops->disable_slot(slot);
 194                         break;
 195
 196                 case 1:
 197                         if (slot->ops->enable_slot)
 198                                 retval = slot->ops->enable_slot(slot);
 199                         break;
 200
 201                 default:
 202                         err ("Illegal value specified for power\n");
 203                         retval = -EINVAL;
 204         }
 205         module_put(slot->ops->owner);
 206
 207 exit:
 208         if (retval)
 209                 return retval;
 210         return count;
 211 }
 212
 213 static struct hotplug_slot_attribute hotplug_slot_attr_power = {
 214         .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 215         .show = power_read_file,
 216         .store = power_write_file
 217 };
 218
 219 static ssize_t attention_read_file (struct hotplug_slot *slot, char *buf)
 220 {
 221         int retval;
 222         u8 value;
 223
 224         retval = get_attention_status (slot, &value);
 225         if (retval)
 226                 goto exit;
 227         retval = sprintf (buf, "%d\n", value);
 228
 229 exit:
 230         return retval;
 231 }
 232
 233 static ssize_t attention_write_file (struct hotplug_slot *slot, const char *buf,
 234                 size_t count)
 235 {
 236         unsigned long lattention;
 237         u8 attention;
 238         int retval = 0;
 239
 240         lattention = simple_strtoul (buf, NULL, 10);
 241         attention = (u8)(lattention & 0xff);
 242         dbg (" - attention = %d\n", attention);
 243
 244         if (!try_module_get(slot->ops->owner)) {
 245                 retval = -ENODEV;
 246                 goto exit;
 247         }
 248         if (slot->ops->set_attention_status)
 249                 retval = slot->ops->set_attention_status(slot, attention);
 250         module_put(slot->ops->owner);
 251
 252 exit:
 253         if (retval)
 254                 return retval;
 255         return count;
 256 }
 257
 258 static struct hotplug_slot_attribute hotplug_slot_attr_attention = {
 259         .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 260         .show = attention_read_file,
 261         .store = attention_write_file
 262 };
 263
 264 static ssize_t latch_read_file (struct hotplug_slot *slot, char *buf)
 265 {
 266         int retval;
 267         u8 value;
 268
 269         retval = get_latch_status (slot, &value);
 270         if (retval)
 271                 goto exit;
 272         retval = sprintf (buf, "%d\n", value);
 273
 274 exit:
 275         return retval;
 276 }
 277
 278 static struct hotplug_slot_attribute hotplug_slot_attr_latch = {
 279         .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
 280         .show = latch_read_file,
 281 };
 282
 283 static ssize_t presence_read_file (struct hotplug_slot *slot, char *buf)
 284 {
 285         int retval;
 286         u8 value;
 287
 288         retval = get_adapter_status (slot, &value);
 289         if (retval)
 290                 goto exit;
 291         retval = sprintf (buf, "%d\n", value);
 292
 293 exit:
 294         return retval;
 295 }
 296
 297 static struct hotplug_slot_attribute hotplug_slot_attr_presence = {
 298         .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
 299         .show = presence_read_file,
 300 };
 301
 302 static ssize_t address_read_file (struct hotplug_slot *slot, char *buf)
 303 {
 304         int retval;
 305         u32 address;
 306
 307         retval = get_address (slot, &address);
 308         if (retval)
 309                 goto exit;
 310         retval = sprintf (buf, "%04x:%02x:%02x\n",
 311                           (address >> 16) & 0xffff,
 312                           (address >> 8) & 0xff,
 313                           address & 0xff);
 314
 315 exit:
 316         return retval;
 317 }
 318
 319 static struct hotplug_slot_attribute hotplug_slot_attr_address = {
 320         .attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
 321         .show = address_read_file,
 322 };
 323
 324 static char *unknown_speed = "Unknown bus speed";
 325
 326 static ssize_t max_bus_speed_read_file (struct hotplug_slot *slot, char *buf)
 327 {
 328         char *speed_string;
 329         int retval;
 330         enum pci_bus_speed value;
 331
 332         retval = get_max_bus_speed (slot, &value);
 333         if (retval)
 334                 goto exit;
 335
 336         if (value == PCI_SPEED_UNKNOWN)
 337                 speed_string = unknown_speed;
 338         else
 339                 speed_string = pci_bus_speed_strings[value];
 340
 341         retval = sprintf (buf, "%s\n", speed_string);
 342
 343 exit:
 344         return retval;
 345 }
 346
 347 static struct hotplug_slot_attribute hotplug_slot_attr_max_bus_speed = {
 348         .attr = {.name = "max_bus_speed", .mode = S_IFREG | S_IRUGO},
 349         .show = max_bus_speed_read_file,
 350 };
 351
 352 static ssize_t cur_bus_speed_read_file (struct hotplug_slot *slot, char *buf)
 353 {
 354         char *speed_string;
 355         int retval;
 356         enum pci_bus_speed value;
 357
 358         retval = get_cur_bus_speed (slot, &value);
 359         if (retval)
 360                 goto exit;
 361
 362         if (value == PCI_SPEED_UNKNOWN)
 363                 speed_string = unknown_speed;
 364         else
 365                 speed_string = pci_bus_speed_strings[value];
 366
 367         retval = sprintf (buf, "%s\n", speed_string);
 368
 369 exit:
 370         return retval;
 371 }
 372
 373 static struct hotplug_slot_attribute hotplug_slot_attr_cur_bus_speed = {
 374         .attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO},
 375         .show = cur_bus_speed_read_file,
 376 };
 377
 378 static ssize_t test_write_file (struct hotplug_slot *slot, const char *buf,
 379                 size_t count)
 380 {
 381         unsigned long ltest;
 382         u32 test;
 383         int retval = 0;
 384
 385         ltest = simple_strtoul (buf, NULL, 10);
 386         test = (u32)(ltest & 0xffffffff);
 387         dbg ("test = %d\n", test);
 388
 389         if (!try_module_get(slot->ops->owner)) {
 390                 retval = -ENODEV;
 391                 goto exit;
 392         }
 393         if (slot->ops->hardware_test)
 394                 retval = slot->ops->hardware_test(slot, test);
 395         module_put(slot->ops->owner);
 396
 397 exit:
 398         if (retval)
 399                 return retval;
 400         return count;
 401 }
 402
 403 static struct hotplug_slot_attribute hotplug_slot_attr_test = {
 404         .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 405         .store = test_write_file
 406 };
 407
 408 static int has_power_file (struct hotplug_slot *slot)
 409 {
 410         if ((!slot) || (!slot->ops))
 411                 return -ENODEV;
 412         if ((slot->ops->enable_slot) ||
 413             (slot->ops->disable_slot) ||
 414             (slot->ops->get_power_status))
 415                 return 0;
 416         return -ENOENT;
 417 }
 418
 419 static int has_attention_file (struct hotplug_slot *slot)
 420 {
 421         if ((!slot) || (!slot->ops))
 422                 return -ENODEV;
 423         if ((slot->ops->set_attention_status) ||
 424             (slot->ops->get_attention_status))
 425                 return 0;
 426         return -ENOENT;
 427 }
 428
 429 static int has_latch_file (struct hotplug_slot *slot)
 430 {
 431         if ((!slot) || (!slot->ops))
 432                 return -ENODEV;
 433         if (slot->ops->get_latch_status)
 434                 return 0;
 435         return -ENOENT;
 436 }
 437
 438 static int has_adapter_file (struct hotplug_slot *slot)
 439 {
 440         if ((!slot) || (!slot->ops))
 441                 return -ENODEV;
 442         if (slot->ops->get_adapter_status)
 443                 return 0;
 444         return -ENOENT;
 445 }
 446
 447 static int has_address_file (struct hotplug_slot *slot)
 448 {
 449         if ((!slot) || (!slot->ops))
 450                 return -ENODEV;
 451         if (slot->ops->get_address)
 452                 return 0;
 453         return -ENOENT;
 454 }
 455
 456 static int has_max_bus_speed_file (struct hotplug_slot *slot)
 457 {
 458         if ((!slot) || (!slot->ops))
 459                 return -ENODEV;
 460         if (slot->ops->get_max_bus_speed)
 461                 return 0;
 462         return -ENOENT;
 463 }
 464
 465 static int has_cur_bus_speed_file (struct hotplug_slot *slot)
 466 {
 467         if ((!slot) || (!slot->ops))
 468                 return -ENODEV;
 469         if (slot->ops->get_cur_bus_speed)
 470                 return 0;
 471         return -ENOENT;
 472 }
 473
 474 static int has_test_file (struct hotplug_slot *slot)
 475 {
 476         if ((!slot) || (!slot->ops))
 477                 return -ENODEV;
 478         if (slot->ops->hardware_test)
 479                 return 0;
 480         return -ENOENT;
 481 }
 482
 483 static int fs_add_slot (struct hotplug_slot *slot)
 484 {
 485         if (has_power_file(slot) == 0)
 486                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 487
 488         if (has_attention_file(slot) == 0)
 489                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
 490
 491         if (has_latch_file(slot) == 0)
 492                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
 493
 494         if (has_adapter_file(slot) == 0)
 495                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
 496
 497         if (has_address_file(slot) == 0)
 498                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_address.attr);
 499
 500         if (has_max_bus_speed_file(slot) == 0)
 501                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
 502
 503         if (has_cur_bus_speed_file(slot) == 0)
 504                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
 505
 506         if (has_test_file(slot) == 0)
 507                 sysfs_create_file(&slot->kobj, &hotplug_slot_attr_test.attr);
 508
 509         return 0;
 510 }
 511
 512 static void fs_remove_slot (struct hotplug_slot *slot)
 513 {
 514         if (has_power_file(slot) == 0)
 515                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 516
 517         if (has_attention_file(slot) == 0)
 518                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
 519
 520         if (has_latch_file(slot) == 0)
 521                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
 522
 523         if (has_adapter_file(slot) == 0)
 524                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
 525
 526         if (has_address_file(slot) == 0)
 527                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_address.attr);
 528
 529         if (has_max_bus_speed_file(slot) == 0)
 530                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
 531
 532         if (has_cur_bus_speed_file(slot) == 0)
 533                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
 534
 535         if (has_test_file(slot) == 0)
 536                 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
 537 }
 538
 539 static struct hotplug_slot *get_slot_from_name (const char *name)
 540 {
 541         struct hotplug_slot *slot;
 542         struct list_head *tmp;
 543
 544         list_for_each (tmp, &pci_hotplug_slot_list) {
 545                 slot = list_entry (tmp, struct hotplug_slot, slot_list);
 546                 if (strcmp(slot->name, name) == 0)
 547                         return slot;
 548         }
 549         return NULL;
 550 }
 551
 552 /**
 553  * pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
 554  * @slot: pointer to the &struct hotplug_slot to register
 555  *
 556  * Registers a hotplug slot with the pci hotplug subsystem, which will allow
 557  * userspace interaction to the slot.
 558  *
 559  * Returns 0 if successful, anything else for an error.
 560  */
 561 int pci_hp_register (struct hotplug_slot *slot)
 562 {
 563         int result;
 564
 565         if (slot == NULL)
 566                 return -ENODEV;
 567         if ((slot->info == NULL) || (slot->ops == NULL))
 568                 return -EINVAL;
 569         if (slot->release == NULL) {
 570                 dbg("Why are you trying to register a hotplug slot"
 571                     "without a proper release function?\n");
 572                 return -EINVAL;
 573         }
 574
 575         kobject_set_name(&slot->kobj, "%s", slot->name);
 576         kobj_set_kset_s(slot, pci_hotplug_slots_subsys);
 577
 578         /* this can fail if we have already registered a slot with the same name */
 579         if (kobject_register(&slot->kobj)) {
 580                 err("Unable to register kobject");
 581                 return -EINVAL;
 582         }
 583
 584         list_add (&slot->slot_list, &pci_hotplug_slot_list);
 585
 586         result = fs_add_slot (slot);
 587         dbg ("Added slot %s to the list\n", slot->name);
 588         return result;
 589 }
 590
 591 /**
 592  * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
 593  * @slot: pointer to the &struct hotplug_slot to deregister
 594  *
 595  * The @slot must have been registered with the pci hotplug subsystem
 596  * previously with a call to pci_hp_register().
 597  *
 598  * Returns 0 if successful, anything else for an error.
 599  */
 600 int pci_hp_deregister (struct hotplug_slot *slot)
 601 {
 602         struct hotplug_slot *temp;
 603
 604         if (slot == NULL)
 605                 return -ENODEV;
 606
 607         temp = get_slot_from_name (slot->name);
 608         if (temp != slot) {
 609                 return -ENODEV;
 610         }
 611         list_del (&slot->slot_list);
 612
 613         fs_remove_slot (slot);
 614         dbg ("Removed slot %s from the list\n", slot->name);
 615         kobject_unregister(&slot->kobj);
 616         return 0;
 617 }
 618
 619 /**
 620  * pci_hp_change_slot_info - changes the slot's information structure in the core
 621  * @slot: pointer to the slot whose info has changed
 622  * @info: pointer to the info copy into the slot's info structure
 623  *
 624  * @slot must have been registered with the pci
 625  * hotplug subsystem previously with a call to pci_hp_register().
 626  *
 627  * Returns 0 if successful, anything else for an error.
 628  */
 629 int pci_hp_change_slot_info (struct hotplug_slot *slot, struct hotplug_slot_info *info)
 630 {
 631         if ((slot == NULL) || (info == NULL))
 632                 return -ENODEV;
 633
 634         /*
 635         * check all fields in the info structure, and update timestamps
 636         * for the files referring to the fields that have now changed.
 637         */
 638         if ((has_power_file(slot) == 0) &&
 639             (slot->info->power_status != info->power_status))
 640                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 641
 642         if ((has_attention_file(slot) == 0) &&
 643             (slot->info->attention_status != info->attention_status))
 644                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
 645
 646         if ((has_latch_file(slot) == 0) &&
 647             (slot->info->latch_status != info->latch_status))
 648                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
 649
 650         if ((has_adapter_file(slot) == 0) &&
 651             (slot->info->adapter_status != info->adapter_status))
 652                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
 653
 654         if ((has_address_file(slot) == 0) &&
 655             (slot->info->address != info->address))
 656                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_address.attr);
 657
 658         if ((has_max_bus_speed_file(slot) == 0) &&
 659             (slot->info->max_bus_speed != info->max_bus_speed))
 660                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
 661
 662         if ((has_cur_bus_speed_file(slot) == 0) &&
 663             (slot->info->cur_bus_speed != info->cur_bus_speed))
 664                 sysfs_update_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
 665
 666         memcpy (slot->info, info, sizeof (struct hotplug_slot_info));
 667
 668         return 0;
 669 }
 670
 671 static int __init pci_hotplug_init (void)
 672 {
 673         int result;
 674
 675         kset_set_kset_s(&pci_hotplug_slots_subsys, pci_bus_type.subsys);
 676         result = subsystem_register(&pci_hotplug_slots_subsys);
 677         if (result) {
 678                 err("Register subsys with error %d\n", result);
 679                 goto exit;
 680         }
 681         result = cpci_hotplug_init(debug);
 682         if (result) {
 683                 err ("cpci_hotplug_init with error %d\n", result);
 684                 goto err_subsys;
 685         }
 686
 687         info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
 688         goto exit;
 689
 690 err_subsys:
 691         subsystem_unregister(&pci_hotplug_slots_subsys);
 692 exit:
 693         return result;
 694 }
 695
 696 static void __exit pci_hotplug_exit (void)
 697 {
 698         cpci_hotplug_exit();
 699         subsystem_unregister(&pci_hotplug_slots_subsys);
 700 }
 701
 702 module_init(pci_hotplug_init);
 703 module_exit(pci_hotplug_exit);
 704
 705 MODULE_AUTHOR(DRIVER_AUTHOR);
 706 MODULE_DESCRIPTION(DRIVER_DESC);
 707 MODULE_LICENSE("GPL");
 708 module_param(debug, bool, 0644);
 709 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
 710
 711 EXPORT_SYMBOL_GPL(pci_hotplug_slots_subsys);
 712 EXPORT_SYMBOL_GPL(pci_hp_register);
 713 EXPORT_SYMBOL_GPL(pci_hp_deregister);
 714 EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);