drivers/acpi/sysfs.c

   1 /*
   2  * sysfs.c - ACPI sysfs interface to userspace.
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <acpi/acpi_drivers.h>
   9
  10 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  11 ACPI_MODULE_NAME("sysfs");
  12
  13 #define PREFIX "ACPI: "
  14
  15 #ifdef CONFIG_ACPI_DEBUG
  16 /*
  17  * ACPI debug sysfs I/F, including:
  18  * /sys/modules/acpi/parameters/debug_layer
  19  * /sys/modules/acpi/parameters/debug_level
  20  * /sys/modules/acpi/parameters/trace_method_name
  21  * /sys/modules/acpi/parameters/trace_state
  22  * /sys/modules/acpi/parameters/trace_debug_layer
  23  * /sys/modules/acpi/parameters/trace_debug_level
  24  */
  25
  26 struct acpi_dlayer {
  27         const char *name;
  28         unsigned long value;
  29 };
  30 struct acpi_dlevel {
  31         const char *name;
  32         unsigned long value;
  33 };
  34 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  35
  36 static const struct acpi_dlayer acpi_debug_layers[] = {
  37         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  38         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  39         ACPI_DEBUG_INIT(ACPI_EVENTS),
  40         ACPI_DEBUG_INIT(ACPI_TABLES),
  41         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  42         ACPI_DEBUG_INIT(ACPI_PARSER),
  43         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  44         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  45         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  46         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  47         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  48         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  49         ACPI_DEBUG_INIT(ACPI_COMPILER),
  50         ACPI_DEBUG_INIT(ACPI_TOOLS),
  51
  52         ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
  53         ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
  54         ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
  55         ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
  56         ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
  57         ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
  58         ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
  59         ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
  60         ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
  61         ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
  62         ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
  63         ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
  64         ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
  65         ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
  66 };
  67
  68 static const struct acpi_dlevel acpi_debug_levels[] = {
  69         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  70         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  71         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  72
  73         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  74         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  75         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  76         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  77         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  78         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  79         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  80         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  81         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  82         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  83         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  84         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  85         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  86         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  87
  88         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  89         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  90         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  91
  92         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  93         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  94         ACPI_DEBUG_INIT(ACPI_LV_IO),
  95         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  96
  97         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  98         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  99         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
 100         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
 101 };
 102
 103 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
 104 {
 105         int result = 0;
 106         int i;
 107
 108         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 109
 110         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 111                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 112                                   acpi_debug_layers[i].name,
 113                                   acpi_debug_layers[i].value,
 114                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
 115                                   ? '*' : ' ');
 116         }
 117         result +=
 118             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 119                     ACPI_ALL_DRIVERS,
 120                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 121                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
 122                     == 0 ? ' ' : '-');
 123         result +=
 124             sprintf(buffer + result,
 125                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
 126                     acpi_dbg_layer);
 127
 128         return result;
 129 }
 130
 131 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
 132 {
 133         int result = 0;
 134         int i;
 135
 136         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 137
 138         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 139                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 140                                   acpi_debug_levels[i].name,
 141                                   acpi_debug_levels[i].value,
 142                                   (acpi_dbg_level & acpi_debug_levels[i].value)
 143                                   ? '*' : ' ');
 144         }
 145         result +=
 146             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 147                     acpi_dbg_level);
 148
 149         return result;
 150 }
 151
 152 static const struct kernel_param_ops param_ops_debug_layer = {
 153         .set = param_set_uint,
 154         .get = param_get_debug_layer,
 155 };
 156
 157 static const struct kernel_param_ops param_ops_debug_level = {
 158         .set = param_set_uint,
 159         .get = param_get_debug_level,
 160 };
 161
 162 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 163 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 164
 165 static char trace_method_name[6];
 166 module_param_string(trace_method_name, trace_method_name, 6, 0644);
 167 static unsigned int trace_debug_layer;
 168 module_param(trace_debug_layer, uint, 0644);
 169 static unsigned int trace_debug_level;
 170 module_param(trace_debug_level, uint, 0644);
 171
 172 static int param_set_trace_state(const char *val, struct kernel_param *kp)
 173 {
 174         int result = 0;
 175
 176         if (!strncmp(val, "enable", strlen("enable") - 1)) {
 177                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
 178                                           trace_debug_layer, 0);
 179                 if (result)
 180                         result = -EBUSY;
 181                 goto exit;
 182         }
 183
 184         if (!strncmp(val, "disable", strlen("disable") - 1)) {
 185                 int name = 0;
 186                 result = acpi_debug_trace((char *)&name, trace_debug_level,
 187                                           trace_debug_layer, 0);
 188                 if (result)
 189                         result = -EBUSY;
 190                 goto exit;
 191         }
 192
 193         if (!strncmp(val, "1", 1)) {
 194                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
 195                                           trace_debug_layer, 1);
 196                 if (result)
 197                         result = -EBUSY;
 198                 goto exit;
 199         }
 200
 201         result = -EINVAL;
 202 exit:
 203         return result;
 204 }
 205
 206 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
 207 {
 208         if (!acpi_gbl_trace_method_name)
 209                 return sprintf(buffer, "disable");
 210         else {
 211                 if (acpi_gbl_trace_flags & 1)
 212                         return sprintf(buffer, "1");
 213                 else
 214                         return sprintf(buffer, "enable");
 215         }
 216         return 0;
 217 }
 218
 219 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 220                   NULL, 0644);
 221 #endif /* CONFIG_ACPI_DEBUG */
 222
 223
 224 /* /sys/modules/acpi/parameters/aml_debug_output */
 225
 226 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
 227                    bool, 0644);
 228 MODULE_PARM_DESC(aml_debug_output,
 229                  "To enable/disable the ACPI Debug Object output.");
 230
 231 /* /sys/module/acpi/parameters/acpica_version */
 232 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
 233 {
 234         int result;
 235
 236         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
 237
 238         return result;
 239 }
 240
 241 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
 242
 243 /*
 244  * ACPI table sysfs I/F:
 245  * /sys/firmware/acpi/tables/
 246  * /sys/firmware/acpi/tables/dynamic/
 247  */
 248
 249 static LIST_HEAD(acpi_table_attr_list);
 250 static struct kobject *tables_kobj;
 251 static struct kobject *dynamic_tables_kobj;
 252
 253 struct acpi_table_attr {
 254         struct bin_attribute attr;
 255         char name[8];
 256         int instance;
 257         struct list_head node;
 258 };
 259
 260 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
 261                                struct bin_attribute *bin_attr, char *buf,
 262                                loff_t offset, size_t count)
 263 {
 264         struct acpi_table_attr *table_attr =
 265             container_of(bin_attr, struct acpi_table_attr, attr);
 266         struct acpi_table_header *table_header = NULL;
 267         acpi_status status;
 268         char name[ACPI_NAME_SIZE];
 269
 270         if (strncmp(table_attr->name, "NULL", 4))
 271                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
 272         else
 273                 memcpy(name, "\0\0\0\0", 4);
 274
 275         status = acpi_get_table(name, table_attr->instance, &table_header);
 276         if (ACPI_FAILURE(status))
 277                 return -ENODEV;
 278
 279         return memory_read_from_buffer(buf, count, &offset,
 280                                        table_header, table_header->length);
 281 }
 282
 283 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
 284                                  struct acpi_table_header *table_header)
 285 {
 286         struct acpi_table_header *header = NULL;
 287         struct acpi_table_attr *attr = NULL;
 288
 289         sysfs_attr_init(&table_attr->attr.attr);
 290         if (table_header->signature[0] != '\0')
 291                 memcpy(table_attr->name, table_header->signature,
 292                        ACPI_NAME_SIZE);
 293         else
 294                 memcpy(table_attr->name, "NULL", 4);
 295
 296         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 297                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
 298                         if (table_attr->instance < attr->instance)
 299                                 table_attr->instance = attr->instance;
 300         }
 301         table_attr->instance++;
 302
 303         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 304                                          !acpi_get_table
 305                                          (table_header->signature, 2, &header)))
 306                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
 307                         table_attr->instance);
 308
 309         table_attr->attr.size = 0;
 310         table_attr->attr.read = acpi_table_show;
 311         table_attr->attr.attr.name = table_attr->name;
 312         table_attr->attr.attr.mode = 0400;
 313
 314         return;
 315 }
 316
 317 static acpi_status
 318 acpi_sysfs_table_handler(u32 event, void *table, void *context)
 319 {
 320         struct acpi_table_attr *table_attr;
 321
 322         switch (event) {
 323         case ACPI_TABLE_EVENT_LOAD:
 324                 table_attr =
 325                     kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 326                 if (!table_attr)
 327                         return AE_NO_MEMORY;
 328
 329                 acpi_table_attr_init(table_attr, table);
 330                 if (sysfs_create_bin_file(dynamic_tables_kobj,
 331                                           &table_attr->attr)) {
 332                         kfree(table_attr);
 333                         return AE_ERROR;
 334                 } else
 335                         list_add_tail(&table_attr->node, &acpi_table_attr_list);
 336                 break;
 337         case ACPI_TABLE_EVENT_UNLOAD:
 338                 /*
 339                  * we do not need to do anything right now
 340                  * because the table is not deleted from the
 341                  * global table list when unloading it.
 342                  */
 343                 break;
 344         default:
 345                 return AE_BAD_PARAMETER;
 346         }
 347         return AE_OK;
 348 }
 349
 350 static int acpi_tables_sysfs_init(void)
 351 {
 352         struct acpi_table_attr *table_attr;
 353         struct acpi_table_header *table_header = NULL;
 354         int table_index = 0;
 355         int result;
 356
 357         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 358         if (!tables_kobj)
 359                 goto err;
 360
 361         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 362         if (!dynamic_tables_kobj)
 363                 goto err_dynamic_tables;
 364
 365         do {
 366                 result = acpi_get_table_by_index(table_index, &table_header);
 367                 if (!result) {
 368                         table_index++;
 369                         table_attr = NULL;
 370                         table_attr =
 371                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 372                         if (!table_attr)
 373                                 return -ENOMEM;
 374
 375                         acpi_table_attr_init(table_attr, table_header);
 376                         result =
 377                             sysfs_create_bin_file(tables_kobj,
 378                                                   &table_attr->attr);
 379                         if (result) {
 380                                 kfree(table_attr);
 381                                 return result;
 382                         } else
 383                                 list_add_tail(&table_attr->node,
 384                                               &acpi_table_attr_list);
 385                 }
 386         } while (!result);
 387         kobject_uevent(tables_kobj, KOBJ_ADD);
 388         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 389         result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
 390
 391         return result == AE_OK ? 0 : -EINVAL;
 392 err_dynamic_tables:
 393         kobject_put(tables_kobj);
 394 err:
 395         return -ENOMEM;
 396 }
 397
 398 /*
 399  * Detailed ACPI IRQ counters:
 400  * /sys/firmware/acpi/interrupts/
 401  */
 402
 403 u32 acpi_irq_handled;
 404 u32 acpi_irq_not_handled;
 405
 406 #define COUNT_GPE 0
 407 #define COUNT_SCI 1             /* acpi_irq_handled */
 408 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
 409 #define COUNT_ERROR 3           /* other */
 410 #define NUM_COUNTERS_EXTRA 4
 411
 412 struct event_counter {
 413         u32 count;
 414         u32 flags;
 415 };
 416
 417 static struct event_counter *all_counters;
 418 static u32 num_gpes;
 419 static u32 num_counters;
 420 static struct attribute **all_attrs;
 421 static u32 acpi_gpe_count;
 422
 423 static struct attribute_group interrupt_stats_attr_group = {
 424         .name = "interrupts",
 425 };
 426
 427 static struct kobj_attribute *counter_attrs;
 428
 429 static void delete_gpe_attr_array(void)
 430 {
 431         struct event_counter *tmp = all_counters;
 432
 433         all_counters = NULL;
 434         kfree(tmp);
 435
 436         if (counter_attrs) {
 437                 int i;
 438
 439                 for (i = 0; i < num_gpes; i++)
 440                         kfree(counter_attrs[i].attr.name);
 441
 442                 kfree(counter_attrs);
 443         }
 444         kfree(all_attrs);
 445
 446         return;
 447 }
 448
 449 static void gpe_count(u32 gpe_number)
 450 {
 451         acpi_gpe_count++;
 452
 453         if (!all_counters)
 454                 return;
 455
 456         if (gpe_number < num_gpes)
 457                 all_counters[gpe_number].count++;
 458         else
 459                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 460                              COUNT_ERROR].count++;
 461
 462         return;
 463 }
 464
 465 static void fixed_event_count(u32 event_number)
 466 {
 467         if (!all_counters)
 468                 return;
 469
 470         if (event_number < ACPI_NUM_FIXED_EVENTS)
 471                 all_counters[num_gpes + event_number].count++;
 472         else
 473                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 474                              COUNT_ERROR].count++;
 475
 476         return;
 477 }
 478
 479 static void acpi_gbl_event_handler(u32 event_type, acpi_handle device,
 480         u32 event_number, void *context)
 481 {
 482         if (event_type == ACPI_EVENT_TYPE_GPE)
 483                 gpe_count(event_number);
 484
 485         if (event_type == ACPI_EVENT_TYPE_FIXED)
 486                 fixed_event_count(event_number);
 487 }
 488
 489 static int get_status(u32 index, acpi_event_status *status,
 490                       acpi_handle *handle)
 491 {
 492         int result = 0;
 493
 494         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 495                 goto end;
 496
 497         if (index < num_gpes) {
 498                 result = acpi_get_gpe_device(index, handle);
 499                 if (result) {
 500                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 501                                         "Invalid GPE 0x%x\n", index));
 502                         goto end;
 503                 }
 504                 result = acpi_get_gpe_status(*handle, index, status);
 505         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 506                 result = acpi_get_event_status(index - num_gpes, status);
 507
 508 end:
 509         return result;
 510 }
 511
 512 static ssize_t counter_show(struct kobject *kobj,
 513                             struct kobj_attribute *attr, char *buf)
 514 {
 515         int index = attr - counter_attrs;
 516         int size;
 517         acpi_handle handle;
 518         acpi_event_status status;
 519         int result = 0;
 520
 521         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 522             acpi_irq_handled;
 523         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 524             acpi_irq_not_handled;
 525         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 526             acpi_gpe_count;
 527         size = sprintf(buf, "%8d", all_counters[index].count);
 528
 529         /* "gpe_all" or "sci" */
 530         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 531                 goto end;
 532
 533         result = get_status(index, &status, &handle);
 534         if (result)
 535                 goto end;
 536
 537         if (!(status & ACPI_EVENT_FLAG_HANDLE))
 538                 size += sprintf(buf + size, "   invalid");
 539         else if (status & ACPI_EVENT_FLAG_ENABLED)
 540                 size += sprintf(buf + size, "   enabled");
 541         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 542                 size += sprintf(buf + size, "   wake_enabled");
 543         else
 544                 size += sprintf(buf + size, "   disabled");
 545
 546 end:
 547         size += sprintf(buf + size, "\n");
 548         return result ? result : size;
 549 }
 550
 551 /*
 552  * counter_set() sets the specified counter.
 553  * setting the total "sci" file to any value clears all counters.
 554  * enable/disable/clear a gpe/fixed event in user space.
 555  */
 556 static ssize_t counter_set(struct kobject *kobj,
 557                            struct kobj_attribute *attr, const char *buf,
 558                            size_t size)
 559 {
 560         int index = attr - counter_attrs;
 561         acpi_event_status status;
 562         acpi_handle handle;
 563         int result = 0;
 564
 565         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 566                 int i;
 567                 for (i = 0; i < num_counters; ++i)
 568                         all_counters[i].count = 0;
 569                 acpi_gpe_count = 0;
 570                 acpi_irq_handled = 0;
 571                 acpi_irq_not_handled = 0;
 572                 goto end;
 573         }
 574
 575         /* show the event status for both GPEs and Fixed Events */
 576         result = get_status(index, &status, &handle);
 577         if (result)
 578                 goto end;
 579
 580         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
 581                 printk(KERN_WARNING PREFIX
 582                        "Can not change Invalid GPE/Fixed Event status\n");
 583                 return -EINVAL;
 584         }
 585
 586         if (index < num_gpes) {
 587                 if (!strcmp(buf, "disable\n") &&
 588                     (status & ACPI_EVENT_FLAG_ENABLED))
 589                         result = acpi_disable_gpe(handle, index);
 590                 else if (!strcmp(buf, "enable\n") &&
 591                          !(status & ACPI_EVENT_FLAG_ENABLED))
 592                         result = acpi_enable_gpe(handle, index);
 593                 else if (!strcmp(buf, "clear\n") &&
 594                          (status & ACPI_EVENT_FLAG_SET))
 595                         result = acpi_clear_gpe(handle, index);
 596                 else
 597                         all_counters[index].count = strtoul(buf, NULL, 0);
 598         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 599                 int event = index - num_gpes;
 600                 if (!strcmp(buf, "disable\n") &&
 601                     (status & ACPI_EVENT_FLAG_ENABLED))
 602                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 603                 else if (!strcmp(buf, "enable\n") &&
 604                          !(status & ACPI_EVENT_FLAG_ENABLED))
 605                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 606                 else if (!strcmp(buf, "clear\n") &&
 607                          (status & ACPI_EVENT_FLAG_SET))
 608                         result = acpi_clear_event(event);
 609                 else
 610                         all_counters[index].count = strtoul(buf, NULL, 0);
 611         } else
 612                 all_counters[index].count = strtoul(buf, NULL, 0);
 613
 614         if (ACPI_FAILURE(result))
 615                 result = -EINVAL;
 616 end:
 617         return result ? result : size;
 618 }
 619
 620 void acpi_irq_stats_init(void)
 621 {
 622         acpi_status status;
 623         int i;
 624
 625         if (all_counters)
 626                 return;
 627
 628         num_gpes = acpi_current_gpe_count;
 629         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 630
 631         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 632                             GFP_KERNEL);
 633         if (all_attrs == NULL)
 634                 return;
 635
 636         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 637                                GFP_KERNEL);
 638         if (all_counters == NULL)
 639                 goto fail;
 640
 641         status = acpi_install_global_event_handler(acpi_gbl_event_handler, NULL);
 642         if (ACPI_FAILURE(status))
 643                 goto fail;
 644
 645         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 646                                 GFP_KERNEL);
 647         if (counter_attrs == NULL)
 648                 goto fail;
 649
 650         for (i = 0; i < num_counters; ++i) {
 651                 char buffer[12];
 652                 char *name;
 653
 654                 if (i < num_gpes)
 655                         sprintf(buffer, "gpe%02X", i);
 656                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 657                         sprintf(buffer, "ff_pmtimer");
 658                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 659                         sprintf(buffer, "ff_gbl_lock");
 660                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 661                         sprintf(buffer, "ff_pwr_btn");
 662                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 663                         sprintf(buffer, "ff_slp_btn");
 664                 else if (i == num_gpes + ACPI_EVENT_RTC)
 665                         sprintf(buffer, "ff_rt_clk");
 666                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 667                         sprintf(buffer, "gpe_all");
 668                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 669                         sprintf(buffer, "sci");
 670                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 671                         sprintf(buffer, "sci_not");
 672                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 673                         sprintf(buffer, "error");
 674                 else
 675                         sprintf(buffer, "bug%02X", i);
 676
 677                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 678                 if (name == NULL)
 679                         goto fail;
 680                 strncpy(name, buffer, strlen(buffer) + 1);
 681
 682                 sysfs_attr_init(&counter_attrs[i].attr);
 683                 counter_attrs[i].attr.name = name;
 684                 counter_attrs[i].attr.mode = 0644;
 685                 counter_attrs[i].show = counter_show;
 686                 counter_attrs[i].store = counter_set;
 687
 688                 all_attrs[i] = &counter_attrs[i].attr;
 689         }
 690
 691         interrupt_stats_attr_group.attrs = all_attrs;
 692         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 693                 return;
 694
 695 fail:
 696         delete_gpe_attr_array();
 697         return;
 698 }
 699
 700 static void __exit interrupt_stats_exit(void)
 701 {
 702         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 703
 704         delete_gpe_attr_array();
 705
 706         return;
 707 }
 708
 709 int __init acpi_sysfs_init(void)
 710 {
 711         int result;
 712
 713         result = acpi_tables_sysfs_init();
 714
 715         return result;
 716 }