drivers/pci/hotplug/shpchp_core.c

   1 /*
   2  * Standard Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <dely.l.sy@intel.com>
  27  *
  28  */
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/kernel.h>
  34 #include <linux/types.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/slab.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/pci.h>
  39 #include <linux/init.h>
  40 #include <asm/uaccess.h>
  41 #include "shpchp.h"
  42 #include "shpchprm.h"
  43
  44 /* Global variables */
  45 int shpchp_debug;
  46 int shpchp_poll_mode;
  47 int shpchp_poll_time;
  48 struct controller *shpchp_ctrl_list;    /* = NULL */
  49 struct pci_func *shpchp_slot_list[256];
  50
  51 #define DRIVER_VERSION  "0.4"
  52 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  53 #define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
  54
  55 MODULE_AUTHOR(DRIVER_AUTHOR);
  56 MODULE_DESCRIPTION(DRIVER_DESC);
  57 MODULE_LICENSE("GPL");
  58
  59 module_param(shpchp_debug, bool, 0644);
  60 module_param(shpchp_poll_mode, bool, 0644);
  61 module_param(shpchp_poll_time, int, 0644);
  62 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
  63 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
  64 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
  65
  66 #define SHPC_MODULE_NAME "shpchp"
  67
  68 static int shpc_start_thread (void);
  69 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  70 static int enable_slot          (struct hotplug_slot *slot);
  71 static int disable_slot         (struct hotplug_slot *slot);
  72 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  73 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  74 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  75 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  76 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  77 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  78
  79 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
  80         .owner =                THIS_MODULE,
  81         .set_attention_status = set_attention_status,
  82         .enable_slot =          enable_slot,
  83         .disable_slot =         disable_slot,
  84         .get_power_status =     get_power_status,
  85         .get_attention_status = get_attention_status,
  86         .get_latch_status =     get_latch_status,
  87         .get_adapter_status =   get_adapter_status,
  88         .get_max_bus_speed =    get_max_bus_speed,
  89         .get_cur_bus_speed =    get_cur_bus_speed,
  90 };
  91
  92 /**
  93  * release_slot - free up the memory used by a slot
  94  * @hotplug_slot: slot to free
  95  */
  96 static void release_slot(struct hotplug_slot *hotplug_slot)
  97 {
  98         struct slot *slot = hotplug_slot->private;
  99
 100         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 101
 102         kfree(slot->hotplug_slot->info);
 103         kfree(slot->hotplug_slot->name);
 104         kfree(slot->hotplug_slot);
 105         kfree(slot);
 106 }
 107
 108 static int init_slots(struct controller *ctrl)
 109 {
 110         struct slot *new_slot;
 111         u8 number_of_slots;
 112         u8 slot_device;
 113         u32 slot_number, sun;
 114         int result = -ENOMEM;
 115
 116         dbg("%s\n",__FUNCTION__);
 117
 118         number_of_slots = ctrl->num_slots;
 119         slot_device = ctrl->slot_device_offset;
 120         slot_number = ctrl->first_slot;
 121
 122         while (number_of_slots) {
 123                 new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL);
 124                 if (!new_slot)
 125                         goto error;
 126
 127                 memset(new_slot, 0, sizeof(struct slot));
 128                 new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
 129                 if (!new_slot->hotplug_slot)
 130                         goto error_slot;
 131                 memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
 132
 133                 new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
 134                 if (!new_slot->hotplug_slot->info)
 135                         goto error_hpslot;
 136                 memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
 137                 new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL);
 138                 if (!new_slot->hotplug_slot->name)
 139                         goto error_info;
 140
 141                 new_slot->magic = SLOT_MAGIC;
 142                 new_slot->ctrl = ctrl;
 143                 new_slot->bus = ctrl->slot_bus;
 144                 new_slot->device = slot_device;
 145                 new_slot->hpc_ops = ctrl->hpc_ops;
 146
 147                 if (shpchprm_get_physical_slot_number(ctrl, &sun,
 148                                         new_slot->bus, new_slot->device))
 149                         goto error_name;
 150
 151                 new_slot->number = sun;
 152                 new_slot->hp_slot = slot_device - ctrl->slot_device_offset;
 153
 154                 /* register this slot with the hotplug pci core */
 155                 new_slot->hotplug_slot->private = new_slot;
 156                 new_slot->hotplug_slot->release = &release_slot;
 157                 make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
 158                 new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 159
 160                 new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
 161                 new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
 162                 new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
 163                 new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));
 164
 165                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus,
 166                         new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
 167                 result = pci_hp_register (new_slot->hotplug_slot);
 168                 if (result) {
 169                         err ("pci_hp_register failed with error %d\n", result);
 170                         goto error_name;
 171                 }
 172
 173                 new_slot->next = ctrl->slot;
 174                 ctrl->slot = new_slot;
 175
 176                 number_of_slots--;
 177                 slot_device++;
 178                 slot_number += ctrl->slot_num_inc;
 179         }
 180
 181         return 0;
 182
 183 error_name:
 184         kfree(new_slot->hotplug_slot->name);
 185 error_info:
 186         kfree(new_slot->hotplug_slot->info);
 187 error_hpslot:
 188         kfree(new_slot->hotplug_slot);
 189 error_slot:
 190         kfree(new_slot);
 191 error:
 192         return result;
 193 }
 194
 195 static void cleanup_slots(struct controller *ctrl)
 196 {
 197         struct slot *old_slot, *next_slot;
 198
 199         old_slot = ctrl->slot;
 200         ctrl->slot = NULL;
 201
 202         while (old_slot) {
 203                 next_slot = old_slot->next;
 204                 pci_hp_deregister(old_slot->hotplug_slot);
 205                 old_slot = next_slot;
 206         }
 207 }
 208
 209 static int get_ctlr_slot_config(struct controller *ctrl)
 210 {
 211         int num_ctlr_slots;
 212         int first_device_num;
 213         int physical_slot_num;
 214         int updown;
 215         int rc;
 216         int flags;
 217
 218         rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags);
 219         if (rc) {
 220                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
 221                 return -1;
 222         }
 223
 224         ctrl->num_slots = num_ctlr_slots;
 225         ctrl->slot_device_offset = first_device_num;
 226         ctrl->first_slot = physical_slot_num;
 227         ctrl->slot_num_inc = updown;            /* either -1 or 1 */
 228
 229         dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n",
 230                 __FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device);
 231
 232         return 0;
 233 }
 234
 235
 236 /*
 237  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 238  */
 239 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 240 {
 241         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 242
 243         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 244
 245         hotplug_slot->info->attention_status = status;
 246         slot->hpc_ops->set_attention_status(slot, status);
 247
 248         return 0;
 249 }
 250
 251
 252 static int enable_slot (struct hotplug_slot *hotplug_slot)
 253 {
 254         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 255
 256         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 257
 258         return shpchp_enable_slot(slot);
 259 }
 260
 261
 262 static int disable_slot (struct hotplug_slot *hotplug_slot)
 263 {
 264         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 265
 266         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 267
 268         return shpchp_disable_slot(slot);
 269 }
 270
 271 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 272 {
 273         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 274         int retval;
 275
 276         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 277
 278         retval = slot->hpc_ops->get_power_status(slot, value);
 279         if (retval < 0)
 280                 *value = hotplug_slot->info->power_status;
 281
 282         return 0;
 283 }
 284
 285 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 286 {
 287         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 288         int retval;
 289
 290         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 291
 292         retval = slot->hpc_ops->get_attention_status(slot, value);
 293         if (retval < 0)
 294                 *value = hotplug_slot->info->attention_status;
 295
 296         return 0;
 297 }
 298
 299 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 300 {
 301         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 302         int retval;
 303
 304         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 305
 306         retval = slot->hpc_ops->get_latch_status(slot, value);
 307         if (retval < 0)
 308                 *value = hotplug_slot->info->latch_status;
 309
 310         return 0;
 311 }
 312
 313 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 314 {
 315         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 316         int retval;
 317
 318         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 319
 320         retval = slot->hpc_ops->get_adapter_status(slot, value);
 321         if (retval < 0)
 322                 *value = hotplug_slot->info->adapter_status;
 323
 324         return 0;
 325 }
 326
 327 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 328 {
 329         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 330         int retval;
 331
 332         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 333
 334         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 335         if (retval < 0)
 336                 *value = PCI_SPEED_UNKNOWN;
 337
 338         return 0;
 339 }
 340
 341 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 342 {
 343         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
 344         int retval;
 345
 346         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 347
 348         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 349         if (retval < 0)
 350                 *value = PCI_SPEED_UNKNOWN;
 351
 352         return 0;
 353 }
 354
 355 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 356 {
 357         int rc;
 358         struct controller *ctrl;
 359         struct slot *t_slot;
 360         int first_device_num;   /* first PCI device number supported by this SHPC */
 361         int num_ctlr_slots;     /* number of slots supported by this SHPC */
 362
 363         ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL);
 364         if (!ctrl) {
 365                 err("%s : out of memory\n", __FUNCTION__);
 366                 goto err_out_none;
 367         }
 368         memset(ctrl, 0, sizeof(struct controller));
 369
 370         dbg("DRV_thread pid = %d\n", current->pid);
 371
 372         rc = shpc_init(ctrl, pdev,
 373                         (php_intr_callback_t) shpchp_handle_attention_button,
 374                         (php_intr_callback_t) shpchp_handle_switch_change,
 375                         (php_intr_callback_t) shpchp_handle_presence_change,
 376                         (php_intr_callback_t) shpchp_handle_power_fault);
 377         if (rc) {
 378                 dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME);
 379                 goto err_out_free_ctrl;
 380         }
 381
 382         dbg("%s: controller initialization success\n", __FUNCTION__);
 383         ctrl->pci_dev = pdev;  /* pci_dev of the P2P bridge */
 384
 385         pci_set_drvdata(pdev, ctrl);
 386
 387         ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL);
 388         if (!ctrl->pci_bus) {
 389                 err("out of memory\n");
 390                 rc = -ENOMEM;
 391                 goto err_out_unmap_mmio_region;
 392         }
 393
 394         memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
 395         ctrl->bus = pdev->bus->number;
 396         ctrl->slot_bus = pdev->subordinate->number;
 397
 398         ctrl->device = PCI_SLOT(pdev->devfn);
 399         ctrl->function = PCI_FUNC(pdev->devfn);
 400         dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
 401
 402         /*
 403          *      Save configuration headers for this and subordinate PCI buses
 404          */
 405
 406         rc = get_ctlr_slot_config(ctrl);
 407         if (rc) {
 408                 err(msg_initialization_err, rc);
 409                 goto err_out_free_ctrl_bus;
 410         }
 411         first_device_num = ctrl->slot_device_offset;
 412         num_ctlr_slots = ctrl->num_slots;
 413
 414         /* Store PCI Config Space for all devices on this bus */
 415         rc = shpchp_save_config(ctrl, ctrl->slot_bus, num_ctlr_slots, first_device_num);
 416         if (rc) {
 417                 err("%s: unable to save PCI configuration data, error %d\n", __FUNCTION__, rc);
 418                 goto err_out_free_ctrl_bus;
 419         }
 420
 421         /* Get IO, memory, and IRQ resources for new devices */
 422         rc = shpchprm_find_available_resources(ctrl);
 423         ctrl->add_support = !rc;
 424
 425         if (rc) {
 426                 dbg("shpchprm_find_available_resources = %#x\n", rc);
 427                 err("unable to locate PCI configuration resources for hot plug add.\n");
 428                 goto err_out_free_ctrl_bus;
 429         }
 430
 431         /* Setup the slot information structures */
 432         rc = init_slots(ctrl);
 433         if (rc) {
 434                 err(msg_initialization_err, 6);
 435                 goto err_out_free_ctrl_slot;
 436         }
 437
 438         /* Now hpc_functions (slot->hpc_ops->functions) are ready  */
 439         t_slot = shpchp_find_slot(ctrl, first_device_num);
 440
 441         /* Check for operation bus speed */
 442         rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
 443         dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
 444
 445         if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
 446                 err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n");
 447                 ctrl->speed = PCI_SPEED_33MHz;
 448         }
 449
 450         /* Finish setting up the hot plug ctrl device */
 451         ctrl->next_event = 0;
 452
 453         if (!shpchp_ctrl_list) {
 454                 shpchp_ctrl_list = ctrl;
 455                 ctrl->next = NULL;
 456         } else {
 457                 ctrl->next = shpchp_ctrl_list;
 458                 shpchp_ctrl_list = ctrl;
 459         }
 460
 461         shpchp_create_ctrl_files(ctrl);
 462
 463         return 0;
 464
 465 err_out_free_ctrl_slot:
 466         cleanup_slots(ctrl);
 467 err_out_free_ctrl_bus:
 468         kfree(ctrl->pci_bus);
 469 err_out_unmap_mmio_region:
 470         ctrl->hpc_ops->release_ctlr(ctrl);
 471 err_out_free_ctrl:
 472         kfree(ctrl);
 473 err_out_none:
 474         return -ENODEV;
 475 }
 476
 477
 478 static int shpc_start_thread(void)
 479 {
 480         int loop;
 481         int retval = 0;
 482
 483         dbg("Initialize + Start the notification/polling mechanism \n");
 484
 485         retval = shpchp_event_start_thread();
 486         if (retval) {
 487                 dbg("shpchp_event_start_thread() failed\n");
 488                 return retval;
 489         }
 490
 491         dbg("Initialize slot lists\n");
 492         /* One slot list for each bus in the system */
 493         for (loop = 0; loop < 256; loop++) {
 494                 shpchp_slot_list[loop] = NULL;
 495         }
 496
 497         return retval;
 498 }
 499
 500 static inline void __exit
 501 free_shpchp_res(struct pci_resource *res)
 502 {
 503         struct pci_resource *tres;
 504
 505         while (res) {
 506                 tres = res;
 507                 res = res->next;
 508                 kfree(tres);
 509         }
 510 }
 511
 512 static void __exit unload_shpchpd(void)
 513 {
 514         struct pci_func *next;
 515         struct pci_func *TempSlot;
 516         int loop;
 517         struct controller *ctrl;
 518         struct controller *tctrl;
 519
 520         ctrl = shpchp_ctrl_list;
 521
 522         while (ctrl) {
 523                 cleanup_slots(ctrl);
 524
 525                 free_shpchp_res(ctrl->io_head);
 526                 free_shpchp_res(ctrl->mem_head);
 527                 free_shpchp_res(ctrl->p_mem_head);
 528                 free_shpchp_res(ctrl->bus_head);
 529
 530                 kfree (ctrl->pci_bus);
 531
 532                 dbg("%s: calling release_ctlr\n", __FUNCTION__);
 533                 ctrl->hpc_ops->release_ctlr(ctrl);
 534
 535                 tctrl = ctrl;
 536                 ctrl = ctrl->next;
 537
 538                 kfree(tctrl);
 539         }
 540
 541         for (loop = 0; loop < 256; loop++) {
 542                 next = shpchp_slot_list[loop];
 543                 while (next != NULL) {
 544                         free_shpchp_res(next->io_head);
 545                         free_shpchp_res(next->mem_head);
 546                         free_shpchp_res(next->p_mem_head);
 547                         free_shpchp_res(next->bus_head);
 548
 549                         TempSlot = next;
 550                         next = next->next;
 551                         kfree(TempSlot);
 552                 }
 553         }
 554
 555         /* Stop the notification mechanism */
 556         shpchp_event_stop_thread();
 557
 558 }
 559
 560
 561 static struct pci_device_id shpcd_pci_tbl[] = {
 562         {
 563         .class =        ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00),
 564         .class_mask =   ~0,
 565         .vendor =       PCI_ANY_ID,
 566         .device =       PCI_ANY_ID,
 567         .subvendor =    PCI_ANY_ID,
 568         .subdevice =    PCI_ANY_ID,
 569         },
 570
 571         { /* end: all zeroes */ }
 572 };
 573
 574 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 575
 576
 577
 578 static struct pci_driver shpc_driver = {
 579         .name =         SHPC_MODULE_NAME,
 580         .id_table =     shpcd_pci_tbl,
 581         .probe =        shpc_probe,
 582         /* remove:      shpc_remove_one, */
 583 };
 584
 585
 586
 587 static int __init shpcd_init(void)
 588 {
 589         int retval = 0;
 590
 591 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
 592         shpchp_poll_mode = 1;
 593 #endif
 594
 595         retval = shpc_start_thread();
 596         if (retval)
 597                 goto error_hpc_init;
 598
 599         retval = shpchprm_init(PCI);
 600         if (!retval) {
 601                 retval = pci_register_driver(&shpc_driver);
 602                 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
 603                 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 604         }
 605
 606 error_hpc_init:
 607         if (retval) {
 608                 shpchprm_cleanup();
 609                 shpchp_event_stop_thread();
 610         } else
 611                 shpchprm_print_pirt();
 612
 613         return retval;
 614 }
 615
 616 static void __exit shpcd_cleanup(void)
 617 {
 618         dbg("unload_shpchpd()\n");
 619         unload_shpchpd();
 620
 621         shpchprm_cleanup();
 622
 623         dbg("pci_unregister_driver\n");
 624         pci_unregister_driver(&shpc_driver);
 625
 626         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 627 }
 628
 629 module_init(shpcd_init);
 630 module_exit(shpcd_cleanup);