drivers/acpi/system.c

   1 /*
   2  *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/proc_fs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30 #include <asm/uaccess.h>
  31
  32 #include <acpi/acpi_drivers.h>
  33
  34 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  35 ACPI_MODULE_NAME("system");
  36 #ifdef MODULE_PARAM_PREFIX
  37 #undef MODULE_PARAM_PREFIX
  38 #endif
  39 #define MODULE_PARAM_PREFIX "acpi."
  40
  41 #define ACPI_SYSTEM_CLASS               "system"
  42 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  43
  44 u32 acpi_irq_handled;
  45
  46 /*
  47  * Make ACPICA version work as module param
  48  */
  49 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  50 {
  51         int result;
  52
  53         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  54
  55         return result;
  56 }
  57
  58 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  59
  60 /* --------------------------------------------------------------------------
  61                               FS Interface (/sys)
  62    -------------------------------------------------------------------------- */
  63 static LIST_HEAD(acpi_table_attr_list);
  64 static struct kobject *tables_kobj;
  65
  66 struct acpi_table_attr {
  67         struct bin_attribute attr;
  68         char name[8];
  69         int instance;
  70         struct list_head node;
  71 };
  72
  73 static ssize_t acpi_table_show(struct kobject *kobj,
  74                                struct bin_attribute *bin_attr, char *buf,
  75                                loff_t offset, size_t count)
  76 {
  77         struct acpi_table_attr *table_attr =
  78             container_of(bin_attr, struct acpi_table_attr, attr);
  79         struct acpi_table_header *table_header = NULL;
  80         acpi_status status;
  81         char name[ACPI_NAME_SIZE];
  82
  83         if (strncmp(table_attr->name, "NULL", 4))
  84                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
  85         else
  86                 memcpy(name, "\0\0\0\0", 4);
  87
  88         status =
  89             acpi_get_table(name, table_attr->instance,
  90                            &table_header);
  91         if (ACPI_FAILURE(status))
  92                 return -ENODEV;
  93
  94         return memory_read_from_buffer(buf, count, &offset,
  95                                         table_header, table_header->length);
  96 }
  97
  98 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
  99                                  struct acpi_table_header *table_header)
 100 {
 101         struct acpi_table_header *header = NULL;
 102         struct acpi_table_attr *attr = NULL;
 103
 104         if (table_header->signature[0] != '\0')
 105                 memcpy(table_attr->name, table_header->signature,
 106                         ACPI_NAME_SIZE);
 107         else
 108                 memcpy(table_attr->name, "NULL", 4);
 109
 110         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 111                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
 112                         if (table_attr->instance < attr->instance)
 113                                 table_attr->instance = attr->instance;
 114         }
 115         table_attr->instance++;
 116
 117         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 118                                         !acpi_get_table
 119                                         (table_header->signature, 2, &header)))
 120                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
 121                         table_attr->instance);
 122
 123         table_attr->attr.size = 0;
 124         table_attr->attr.read = acpi_table_show;
 125         table_attr->attr.attr.name = table_attr->name;
 126         table_attr->attr.attr.mode = 0444;
 127
 128         return;
 129 }
 130
 131 static int acpi_system_sysfs_init(void)
 132 {
 133         struct acpi_table_attr *table_attr;
 134         struct acpi_table_header *table_header = NULL;
 135         int table_index = 0;
 136         int result;
 137
 138         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 139         if (!tables_kobj)
 140                 return -ENOMEM;
 141
 142         do {
 143                 result = acpi_get_table_by_index(table_index, &table_header);
 144                 if (!result) {
 145                         table_index++;
 146                         table_attr = NULL;
 147                         table_attr =
 148                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 149                         if (!table_attr)
 150                                 return -ENOMEM;
 151
 152                         acpi_table_attr_init(table_attr, table_header);
 153                         result =
 154                             sysfs_create_bin_file(tables_kobj,
 155                                                   &table_attr->attr);
 156                         if (result) {
 157                                 kfree(table_attr);
 158                                 return result;
 159                         } else
 160                                 list_add_tail(&table_attr->node,
 161                                               &acpi_table_attr_list);
 162                 }
 163         } while (!result);
 164         kobject_uevent(tables_kobj, KOBJ_ADD);
 165
 166         return 0;
 167 }
 168
 169 /*
 170  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 171  * See Documentation/ABI/testing/sysfs-firmware-acpi
 172  */
 173
 174 #define COUNT_GPE 0
 175 #define COUNT_SCI 1     /* acpi_irq_handled */
 176 #define COUNT_ERROR 2   /* other */
 177 #define NUM_COUNTERS_EXTRA 3
 178
 179 #define ACPI_EVENT_VALID        0x01
 180 struct event_counter {
 181         u32 count;
 182         u32 flags;
 183 };
 184
 185 static struct event_counter *all_counters;
 186 static u32 num_gpes;
 187 static u32 num_counters;
 188 static struct attribute **all_attrs;
 189 static u32 acpi_gpe_count;
 190
 191 static struct attribute_group interrupt_stats_attr_group = {
 192         .name = "interrupts",
 193 };
 194 static struct kobj_attribute *counter_attrs;
 195
 196 static int count_num_gpes(void)
 197 {
 198         int count = 0;
 199         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 200         struct acpi_gpe_block_info *gpe_block;
 201         acpi_cpu_flags flags;
 202
 203         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 204
 205         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 206         while (gpe_xrupt_info) {
 207                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 208                 while (gpe_block) {
 209                         count += gpe_block->register_count *
 210                             ACPI_GPE_REGISTER_WIDTH;
 211                         gpe_block = gpe_block->next;
 212                 }
 213                 gpe_xrupt_info = gpe_xrupt_info->next;
 214         }
 215         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 216
 217         return count;
 218 }
 219
 220 static int get_gpe_device(int index, acpi_handle *handle)
 221 {
 222         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 223         struct acpi_gpe_block_info *gpe_block;
 224         acpi_cpu_flags flags;
 225         struct acpi_namespace_node *node;
 226
 227         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 228
 229         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 230         while (gpe_xrupt_info) {
 231                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 232                 node = gpe_block->node;
 233                 while (gpe_block) {
 234                         index -= gpe_block->register_count *
 235                             ACPI_GPE_REGISTER_WIDTH;
 236                         if (index < 0) {
 237                                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 238                                 /* return NULL if it's FADT GPE */
 239                                 if (node->type != ACPI_TYPE_DEVICE)
 240                                         *handle = NULL;
 241                                 else
 242                                         *handle = node;
 243                                 return 0;
 244                         }
 245                         node = gpe_block->node;
 246                         gpe_block = gpe_block->next;
 247                 }
 248                 gpe_xrupt_info = gpe_xrupt_info->next;
 249         }
 250         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 251
 252         return -ENODEV;
 253 }
 254
 255 static void delete_gpe_attr_array(void)
 256 {
 257         struct event_counter *tmp = all_counters;
 258
 259         all_counters = NULL;
 260         kfree(tmp);
 261
 262         if (counter_attrs) {
 263                 int i;
 264
 265                 for (i = 0; i < num_gpes; i++)
 266                         kfree(counter_attrs[i].attr.name);
 267
 268                 kfree(counter_attrs);
 269         }
 270         kfree(all_attrs);
 271
 272         return;
 273 }
 274
 275 void acpi_os_gpe_count(u32 gpe_number)
 276 {
 277         acpi_gpe_count++;
 278
 279         if (!all_counters)
 280                 return;
 281
 282         if (gpe_number < num_gpes)
 283                 all_counters[gpe_number].count++;
 284         else
 285                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 286                                         count++;
 287
 288         return;
 289 }
 290
 291 void acpi_os_fixed_event_count(u32 event_number)
 292 {
 293         if (!all_counters)
 294                 return;
 295
 296         if (event_number < ACPI_NUM_FIXED_EVENTS)
 297                 all_counters[num_gpes + event_number].count++;
 298         else
 299                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 300                                 count++;
 301
 302         return;
 303 }
 304
 305 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 306 {
 307         int result = 0;
 308
 309         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 310                 goto end;
 311
 312         if (index < num_gpes) {
 313                 result = get_gpe_device(index, handle);
 314                 if (result) {
 315                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 316                                 "Invalid GPE 0x%x\n", index));
 317                         goto end;
 318                 }
 319                 result = acpi_get_gpe_status(*handle, index,
 320                                                 ACPI_NOT_ISR, status);
 321         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 322                 result = acpi_get_event_status(index - num_gpes, status);
 323
 324         /*
 325          * sleep/power button GPE/Fixed Event is enabled after acpi_system_init,
 326          * check the status at runtime and mark it as valid once it's enabled
 327          */
 328         if (!result && (*status & ACPI_EVENT_FLAG_ENABLED))
 329                 all_counters[index].flags |= ACPI_EVENT_VALID;
 330 end:
 331         return result;
 332 }
 333
 334 static ssize_t counter_show(struct kobject *kobj,
 335         struct kobj_attribute *attr, char *buf)
 336 {
 337         int index = attr - counter_attrs;
 338         int size;
 339         acpi_handle handle;
 340         acpi_event_status status;
 341         int result = 0;
 342
 343         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 344                 acpi_irq_handled;
 345         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 346                 acpi_gpe_count;
 347
 348         size = sprintf(buf, "%8d", all_counters[index].count);
 349
 350         /* "gpe_all" or "sci" */
 351         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 352                 goto end;
 353
 354         result = get_status(index, &status, &handle);
 355         if (result)
 356                 goto end;
 357
 358         if (!(all_counters[index].flags & ACPI_EVENT_VALID))
 359                 size += sprintf(buf + size, "  invalid");
 360         else if (status & ACPI_EVENT_FLAG_ENABLED)
 361                 size += sprintf(buf + size, "   enable");
 362         else
 363                 size += sprintf(buf + size, "  disable");
 364
 365 end:
 366         size += sprintf(buf + size, "\n");
 367         return result ? result : size;
 368 }
 369
 370 /*
 371  * counter_set() sets the specified counter.
 372  * setting the total "sci" file to any value clears all counters.
 373  * enable/disable/clear a gpe/fixed event in user space.
 374  */
 375 static ssize_t counter_set(struct kobject *kobj,
 376         struct kobj_attribute *attr, const char *buf, size_t size)
 377 {
 378         int index = attr - counter_attrs;
 379         acpi_event_status status;
 380         acpi_handle handle;
 381         int result = 0;
 382
 383         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 384                 int i;
 385                 for (i = 0; i < num_counters; ++i)
 386                         all_counters[i].count = 0;
 387                 acpi_gpe_count = 0;
 388                 acpi_irq_handled = 0;
 389                 goto end;
 390         }
 391
 392         /* show the event status for both GPEs and Fixed Events */
 393         result = get_status(index, &status, &handle);
 394         if (result)
 395                 goto end;
 396
 397         if (!(all_counters[index].flags & ACPI_EVENT_VALID)) {
 398                 printk(KERN_WARNING PREFIX
 399                         "Can not change Invalid GPE/Fixed Event status\n");
 400                 return -EINVAL;
 401         }
 402
 403         if (index < num_gpes) {
 404                 if (!strcmp(buf, "disable\n") &&
 405                                 (status & ACPI_EVENT_FLAG_ENABLED))
 406                         result = acpi_disable_gpe(handle, index, ACPI_NOT_ISR);
 407                 else if (!strcmp(buf, "enable\n") &&
 408                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 409                         result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
 410                 else if (!strcmp(buf, "clear\n") &&
 411                                 (status & ACPI_EVENT_FLAG_SET))
 412                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 413                 else
 414                         all_counters[index].count = strtoul(buf, NULL, 0);
 415         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 416                 int event = index - num_gpes;
 417                 if (!strcmp(buf, "disable\n") &&
 418                                 (status & ACPI_EVENT_FLAG_ENABLED))
 419                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 420                 else if (!strcmp(buf, "enable\n") &&
 421                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 422                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 423                 else if (!strcmp(buf, "clear\n") &&
 424                                 (status & ACPI_EVENT_FLAG_SET))
 425                         result = acpi_clear_event(event);
 426                 else
 427                         all_counters[index].count = strtoul(buf, NULL, 0);
 428         } else
 429                 all_counters[index].count = strtoul(buf, NULL, 0);
 430
 431         if (ACPI_FAILURE(result))
 432                 result = -EINVAL;
 433 end:
 434         return result ? result : size;
 435 }
 436
 437 void acpi_irq_stats_init(void)
 438 {
 439         int i;
 440
 441         if (all_counters)
 442                 return;
 443
 444         num_gpes = count_num_gpes();
 445         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 446
 447         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 448                         GFP_KERNEL);
 449         if (all_attrs == NULL)
 450                 return;
 451
 452         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 453                                 GFP_KERNEL);
 454         if (all_counters == NULL)
 455                 goto fail;
 456
 457         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 458                         GFP_KERNEL);
 459         if (counter_attrs == NULL)
 460                 goto fail;
 461
 462         for (i = 0; i < num_counters; ++i) {
 463                 char buffer[12];
 464                 char *name;
 465
 466                 if (i < num_gpes)
 467                         sprintf(buffer, "gpe%02X", i);
 468                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 469                         sprintf(buffer, "ff_pmtimer");
 470                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 471                         sprintf(buffer, "ff_gbl_lock");
 472                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 473                         sprintf(buffer, "ff_pwr_btn");
 474                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 475                         sprintf(buffer, "ff_slp_btn");
 476                 else if (i == num_gpes + ACPI_EVENT_RTC)
 477                         sprintf(buffer, "ff_rt_clk");
 478                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 479                         sprintf(buffer, "gpe_all");
 480                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 481                         sprintf(buffer, "sci");
 482                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 483                         sprintf(buffer, "error");
 484                 else
 485                         sprintf(buffer, "bug%02X", i);
 486
 487                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 488                 if (name == NULL)
 489                         goto fail;
 490                 strncpy(name, buffer, strlen(buffer) + 1);
 491
 492                 counter_attrs[i].attr.name = name;
 493                 counter_attrs[i].attr.mode = 0644;
 494                 counter_attrs[i].show = counter_show;
 495                 counter_attrs[i].store = counter_set;
 496
 497                 all_attrs[i] = &counter_attrs[i].attr;
 498         }
 499
 500         interrupt_stats_attr_group.attrs = all_attrs;
 501         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 502                 return;
 503
 504 fail:
 505         delete_gpe_attr_array();
 506         return;
 507 }
 508
 509 static void __exit interrupt_stats_exit(void)
 510 {
 511         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 512
 513         delete_gpe_attr_array();
 514
 515         return;
 516 }
 517
 518 /* --------------------------------------------------------------------------
 519                               FS Interface (/proc)
 520    -------------------------------------------------------------------------- */
 521 #ifdef CONFIG_ACPI_PROCFS
 522 #define ACPI_SYSTEM_FILE_INFO           "info"
 523 #define ACPI_SYSTEM_FILE_EVENT          "event"
 524 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 525 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 526
 527 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 528 {
 529
 530         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 531         return 0;
 532 }
 533
 534 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 535 {
 536         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 537 }
 538
 539 static const struct file_operations acpi_system_info_ops = {
 540         .owner = THIS_MODULE,
 541         .open = acpi_system_info_open_fs,
 542         .read = seq_read,
 543         .llseek = seq_lseek,
 544         .release = single_release,
 545 };
 546
 547 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 548                                      loff_t *);
 549
 550 static const struct file_operations acpi_system_dsdt_ops = {
 551         .owner = THIS_MODULE,
 552         .read = acpi_system_read_dsdt,
 553 };
 554
 555 static ssize_t
 556 acpi_system_read_dsdt(struct file *file,
 557                       char __user * buffer, size_t count, loff_t * ppos)
 558 {
 559         acpi_status status = AE_OK;
 560         struct acpi_table_header *dsdt = NULL;
 561         ssize_t res;
 562
 563         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 564         if (ACPI_FAILURE(status))
 565                 return -ENODEV;
 566
 567         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 568
 569         return res;
 570 }
 571
 572 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 573                                      loff_t *);
 574
 575 static const struct file_operations acpi_system_fadt_ops = {
 576         .owner = THIS_MODULE,
 577         .read = acpi_system_read_fadt,
 578 };
 579
 580 static ssize_t
 581 acpi_system_read_fadt(struct file *file,
 582                       char __user * buffer, size_t count, loff_t * ppos)
 583 {
 584         acpi_status status = AE_OK;
 585         struct acpi_table_header *fadt = NULL;
 586         ssize_t res;
 587
 588         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 589         if (ACPI_FAILURE(status))
 590                 return -ENODEV;
 591
 592         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 593
 594         return res;
 595 }
 596
 597 static int acpi_system_procfs_init(void)
 598 {
 599         struct proc_dir_entry *entry;
 600         int error = 0;
 601
 602         /* 'info' [R] */
 603         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 604                             &acpi_system_info_ops);
 605         if (!entry)
 606                 goto Error;
 607
 608         /* 'dsdt' [R] */
 609         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 610                             &acpi_system_dsdt_ops);
 611         if (!entry)
 612                 goto Error;
 613
 614         /* 'fadt' [R] */
 615         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 616                             &acpi_system_fadt_ops);
 617         if (!entry)
 618                 goto Error;
 619
 620       Done:
 621         return error;
 622
 623       Error:
 624         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 625         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 626         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 627
 628         error = -EFAULT;
 629         goto Done;
 630 }
 631 #else
 632 static int acpi_system_procfs_init(void)
 633 {
 634         return 0;
 635 }
 636 #endif
 637
 638 static int __init acpi_system_init(void)
 639 {
 640         int result = 0;
 641
 642         if (acpi_disabled)
 643                 return 0;
 644
 645         result = acpi_system_procfs_init();
 646         if (result)
 647                 return result;
 648
 649         result = acpi_system_sysfs_init();
 650
 651         return result;
 652 }
 653
 654 subsys_initcall(acpi_system_init);