drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <linux/dmi.h>
  43
  44 #include "internal.h"
  45
  46 #define _COMPONENT              ACPI_BUS_COMPONENT
  47 ACPI_MODULE_NAME("bus");
  48
  49 struct acpi_device *acpi_root;
  50 struct proc_dir_entry *acpi_root_dir;
  51 EXPORT_SYMBOL(acpi_root_dir);
  52
  53 #define STRUCT_TO_INT(s)        (*((int*)&s))
  54
  55 static int set_power_nocheck(const struct dmi_system_id *id)
  56 {
  57         printk(KERN_NOTICE PREFIX "%s detected - "
  58                 "disable power check in power transition\n", id->ident);
  59         acpi_power_nocheck = 1;
  60         return 0;
  61 }
  62 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  63         {
  64         set_power_nocheck, "HP Pavilion 05", {
  65         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  66         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  67         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  68         {},
  69 };
  70
  71
  72 #ifdef CONFIG_X86
  73 static int set_copy_dsdt(const struct dmi_system_id *id)
  74 {
  75         printk(KERN_NOTICE "%s detected - "
  76                 "force copy of DSDT to local memory\n", id->ident);
  77         acpi_gbl_copy_dsdt_locally = 1;
  78         return 0;
  79 }
  80
  81 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  82         /*
  83          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  84          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  85          */
  86         {
  87          .callback = set_copy_dsdt,
  88          .ident = "TOSHIBA Satellite",
  89          .matches = {
  90                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  91                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  92                 },
  93         },
  94         {}
  95 };
  96 #else
  97 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  98         {}
  99 };
 100 #endif
 101
 102 /* --------------------------------------------------------------------------
 103                                 Device Management
 104    -------------------------------------------------------------------------- */
 105
 106 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 107 {
 108         acpi_status status = AE_OK;
 109
 110
 111         if (!device)
 112                 return -EINVAL;
 113
 114         /* TBD: Support fixed-feature devices */
 115
 116         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 117         if (ACPI_FAILURE(status) || !*device) {
 118                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 119                                   handle));
 120                 return -ENODEV;
 121         }
 122
 123         return 0;
 124 }
 125
 126 EXPORT_SYMBOL(acpi_bus_get_device);
 127
 128 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 129                                        unsigned long long *sta)
 130 {
 131         acpi_status status;
 132
 133         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 134         if (ACPI_SUCCESS(status))
 135                 return AE_OK;
 136
 137         if (status == AE_NOT_FOUND) {
 138                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 139                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 140                 return AE_OK;
 141         }
 142         return status;
 143 }
 144
 145 int acpi_bus_get_status(struct acpi_device *device)
 146 {
 147         acpi_status status;
 148         unsigned long long sta;
 149
 150         status = acpi_bus_get_status_handle(device->handle, &sta);
 151         if (ACPI_FAILURE(status))
 152                 return -ENODEV;
 153
 154         STRUCT_TO_INT(device->status) = (int) sta;
 155
 156         if (device->status.functional && !device->status.present) {
 157                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 158                        "functional but not present;\n",
 159                         device->pnp.bus_id,
 160                         (u32) STRUCT_TO_INT(device->status)));
 161         }
 162
 163         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 164                           device->pnp.bus_id,
 165                           (u32) STRUCT_TO_INT(device->status)));
 166         return 0;
 167 }
 168 EXPORT_SYMBOL(acpi_bus_get_status);
 169
 170 void acpi_bus_private_data_handler(acpi_handle handle,
 171                                    void *context)
 172 {
 173         return;
 174 }
 175 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 176
 177 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 178 {
 179         acpi_status status = AE_OK;
 180
 181         if (!*data)
 182                 return -EINVAL;
 183
 184         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 185         if (ACPI_FAILURE(status) || !*data) {
 186                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 187                                 handle));
 188                 return -ENODEV;
 189         }
 190
 191         return 0;
 192 }
 193 EXPORT_SYMBOL(acpi_bus_get_private_data);
 194
 195 /* --------------------------------------------------------------------------
 196                                  Power Management
 197    -------------------------------------------------------------------------- */
 198
 199 int acpi_bus_get_power(acpi_handle handle, int *state)
 200 {
 201         int result = 0;
 202         acpi_status status = 0;
 203         struct acpi_device *device = NULL;
 204         unsigned long long psc = 0;
 205
 206
 207         result = acpi_bus_get_device(handle, &device);
 208         if (result)
 209                 return result;
 210
 211         *state = ACPI_STATE_UNKNOWN;
 212
 213         if (!device->flags.power_manageable) {
 214                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 215                 if (device->parent)
 216                         *state = device->parent->power.state;
 217                 else
 218                         *state = ACPI_STATE_D0;
 219         } else {
 220                 /*
 221                  * Get the device's power state either directly (via _PSC) or
 222                  * indirectly (via power resources).
 223                  */
 224                 if (device->power.flags.power_resources) {
 225                         result = acpi_power_get_inferred_state(device);
 226                         if (result)
 227                                 return result;
 228                 } else if (device->power.flags.explicit_get) {
 229                         status = acpi_evaluate_integer(device->handle, "_PSC",
 230                                                        NULL, &psc);
 231                         if (ACPI_FAILURE(status))
 232                                 return -ENODEV;
 233                         device->power.state = (int)psc;
 234                 }
 235
 236                 *state = device->power.state;
 237         }
 238
 239         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 240                           device->pnp.bus_id, device->power.state));
 241
 242         return 0;
 243 }
 244
 245 EXPORT_SYMBOL(acpi_bus_get_power);
 246
 247 int acpi_bus_set_power(acpi_handle handle, int state)
 248 {
 249         int result = 0;
 250         acpi_status status = AE_OK;
 251         struct acpi_device *device = NULL;
 252         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 253
 254
 255         result = acpi_bus_get_device(handle, &device);
 256         if (result)
 257                 return result;
 258
 259         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 260                 return -EINVAL;
 261
 262         /* Make sure this is a valid target state */
 263
 264         if (!device->flags.power_manageable) {
 265                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 266                                 kobject_name(&device->dev.kobj)));
 267                 return -ENODEV;
 268         }
 269         /*
 270          * Get device's current power state
 271          */
 272         if (!acpi_power_nocheck) {
 273                 /*
 274                  * Maybe the incorrect power state is returned on the bogus
 275                  * bios, which is different with the real power state.
 276                  * For example: the bios returns D0 state and the real power
 277                  * state is D3. OS expects to set the device to D0 state. In
 278                  * such case if OS uses the power state returned by the BIOS,
 279                  * the device can't be transisted to the correct power state.
 280                  * So if the acpi_power_nocheck is set, it is unnecessary to
 281                  * get the power state by calling acpi_bus_get_power.
 282                  */
 283                 acpi_bus_get_power(device->handle, &device->power.state);
 284         }
 285         if ((state == device->power.state) && !device->flags.force_power_state) {
 286                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 287                                   state));
 288                 return 0;
 289         }
 290
 291         if (!device->power.states[state].flags.valid) {
 292                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 293                 return -ENODEV;
 294         }
 295         if (device->parent && (state < device->parent->power.state)) {
 296                 printk(KERN_WARNING PREFIX
 297                               "Cannot set device to a higher-powered"
 298                               " state than parent\n");
 299                 return -ENODEV;
 300         }
 301
 302         /*
 303          * Transition Power
 304          * ----------------
 305          * On transitions to a high-powered state we first apply power (via
 306          * power resources) then evalute _PSx.  Conversly for transitions to
 307          * a lower-powered state.
 308          */
 309         if (state < device->power.state) {
 310                 if (device->power.flags.power_resources) {
 311                         result = acpi_power_transition(device, state);
 312                         if (result)
 313                                 goto end;
 314                 }
 315                 if (device->power.states[state].flags.explicit_set) {
 316                         status = acpi_evaluate_object(device->handle,
 317                                                       object_name, NULL, NULL);
 318                         if (ACPI_FAILURE(status)) {
 319                                 result = -ENODEV;
 320                                 goto end;
 321                         }
 322                 }
 323         } else {
 324                 if (device->power.states[state].flags.explicit_set) {
 325                         status = acpi_evaluate_object(device->handle,
 326                                                       object_name, NULL, NULL);
 327                         if (ACPI_FAILURE(status)) {
 328                                 result = -ENODEV;
 329                                 goto end;
 330                         }
 331                 }
 332                 if (device->power.flags.power_resources) {
 333                         result = acpi_power_transition(device, state);
 334                         if (result)
 335                                 goto end;
 336                 }
 337         }
 338
 339       end:
 340         if (result)
 341                 printk(KERN_WARNING PREFIX
 342                               "Device [%s] failed to transition to D%d\n",
 343                               device->pnp.bus_id, state);
 344         else {
 345                 device->power.state = state;
 346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 347                                   "Device [%s] transitioned to D%d\n",
 348                                   device->pnp.bus_id, state));
 349         }
 350
 351         return result;
 352 }
 353
 354 EXPORT_SYMBOL(acpi_bus_set_power);
 355
 356 bool acpi_bus_power_manageable(acpi_handle handle)
 357 {
 358         struct acpi_device *device;
 359         int result;
 360
 361         result = acpi_bus_get_device(handle, &device);
 362         return result ? false : device->flags.power_manageable;
 363 }
 364
 365 EXPORT_SYMBOL(acpi_bus_power_manageable);
 366
 367 bool acpi_bus_can_wakeup(acpi_handle handle)
 368 {
 369         struct acpi_device *device;
 370         int result;
 371
 372         result = acpi_bus_get_device(handle, &device);
 373         return result ? false : device->wakeup.flags.valid;
 374 }
 375
 376 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 377
 378 static void acpi_print_osc_error(acpi_handle handle,
 379         struct acpi_osc_context *context, char *error)
 380 {
 381         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 382         int i;
 383
 384         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 385                 printk(KERN_DEBUG "%s\n", error);
 386         else {
 387                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 388                 kfree(buffer.pointer);
 389         }
 390         printk(KERN_DEBUG"_OSC request data:");
 391         for (i = 0; i < context->cap.length; i += sizeof(u32))
 392                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 393         printk("\n");
 394 }
 395
 396 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 397 {
 398         int i;
 399         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 400                 24, 26, 28, 30, 32, 34};
 401
 402         if (strlen(str) != 36)
 403                 return AE_BAD_PARAMETER;
 404         for (i = 0; i < 36; i++) {
 405                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 406                         if (str[i] != '-')
 407                                 return AE_BAD_PARAMETER;
 408                 } else if (!isxdigit(str[i]))
 409                         return AE_BAD_PARAMETER;
 410         }
 411         for (i = 0; i < 16; i++) {
 412                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 413                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 414         }
 415         return AE_OK;
 416 }
 417
 418 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 419 {
 420         acpi_status status;
 421         struct acpi_object_list input;
 422         union acpi_object in_params[4];
 423         union acpi_object *out_obj;
 424         u8 uuid[16];
 425         u32 errors;
 426         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 427
 428         if (!context)
 429                 return AE_ERROR;
 430         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 431                 return AE_ERROR;
 432         context->ret.length = ACPI_ALLOCATE_BUFFER;
 433         context->ret.pointer = NULL;
 434
 435         /* Setting up input parameters */
 436         input.count = 4;
 437         input.pointer = in_params;
 438         in_params[0].type               = ACPI_TYPE_BUFFER;
 439         in_params[0].buffer.length      = 16;
 440         in_params[0].buffer.pointer     = uuid;
 441         in_params[1].type               = ACPI_TYPE_INTEGER;
 442         in_params[1].integer.value      = context->rev;
 443         in_params[2].type               = ACPI_TYPE_INTEGER;
 444         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 445         in_params[3].type               = ACPI_TYPE_BUFFER;
 446         in_params[3].buffer.length      = context->cap.length;
 447         in_params[3].buffer.pointer     = context->cap.pointer;
 448
 449         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 450         if (ACPI_FAILURE(status))
 451                 return status;
 452
 453         if (!output.length)
 454                 return AE_NULL_OBJECT;
 455
 456         out_obj = output.pointer;
 457         if (out_obj->type != ACPI_TYPE_BUFFER
 458                 || out_obj->buffer.length != context->cap.length) {
 459                 acpi_print_osc_error(handle, context,
 460                         "_OSC evaluation returned wrong type");
 461                 status = AE_TYPE;
 462                 goto out_kfree;
 463         }
 464         /* Need to ignore the bit0 in result code */
 465         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 466         if (errors) {
 467                 if (errors & OSC_REQUEST_ERROR)
 468                         acpi_print_osc_error(handle, context,
 469                                 "_OSC request failed");
 470                 if (errors & OSC_INVALID_UUID_ERROR)
 471                         acpi_print_osc_error(handle, context,
 472                                 "_OSC invalid UUID");
 473                 if (errors & OSC_INVALID_REVISION_ERROR)
 474                         acpi_print_osc_error(handle, context,
 475                                 "_OSC invalid revision");
 476                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 477                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 478                             & OSC_QUERY_ENABLE)
 479                                 goto out_success;
 480                         status = AE_SUPPORT;
 481                         goto out_kfree;
 482                 }
 483                 status = AE_ERROR;
 484                 goto out_kfree;
 485         }
 486 out_success:
 487         context->ret.length = out_obj->buffer.length;
 488         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 489         if (!context->ret.pointer) {
 490                 status =  AE_NO_MEMORY;
 491                 goto out_kfree;
 492         }
 493         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 494                 context->ret.length);
 495         status =  AE_OK;
 496
 497 out_kfree:
 498         kfree(output.pointer);
 499         if (status != AE_OK)
 500                 context->ret.pointer = NULL;
 501         return status;
 502 }
 503 EXPORT_SYMBOL(acpi_run_osc);
 504
 505 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 506 static void acpi_bus_osc_support(void)
 507 {
 508         u32 capbuf[2];
 509         struct acpi_osc_context context = {
 510                 .uuid_str = sb_uuid_str,
 511                 .rev = 1,
 512                 .cap.length = 8,
 513                 .cap.pointer = capbuf,
 514         };
 515         acpi_handle handle;
 516
 517         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 518         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 519 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 520                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 521         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 522 #endif
 523
 524 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 525         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 526 #endif
 527         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 528                 return;
 529         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 530                 kfree(context.ret.pointer);
 531         /* do we need to check the returned cap? Sounds no */
 532 }
 533
 534 /* --------------------------------------------------------------------------
 535                                 Event Management
 536    -------------------------------------------------------------------------- */
 537
 538 #ifdef CONFIG_ACPI_PROC_EVENT
 539 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 540
 541 LIST_HEAD(acpi_bus_event_list);
 542 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 543
 544 extern int event_is_open;
 545
 546 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 547 {
 548         struct acpi_bus_event *event;
 549         unsigned long flags = 0;
 550
 551         /* drop event on the floor if no one's listening */
 552         if (!event_is_open)
 553                 return 0;
 554
 555         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 556         if (!event)
 557                 return -ENOMEM;
 558
 559         strcpy(event->device_class, device_class);
 560         strcpy(event->bus_id, bus_id);
 561         event->type = type;
 562         event->data = data;
 563
 564         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 565         list_add_tail(&event->node, &acpi_bus_event_list);
 566         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 567
 568         wake_up_interruptible(&acpi_bus_event_queue);
 569
 570         return 0;
 571
 572 }
 573
 574 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 575
 576 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 577 {
 578         if (!device)
 579                 return -EINVAL;
 580         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 581                                              device->pnp.bus_id, type, data);
 582 }
 583
 584 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 585
 586 int acpi_bus_receive_event(struct acpi_bus_event *event)
 587 {
 588         unsigned long flags = 0;
 589         struct acpi_bus_event *entry = NULL;
 590
 591         DECLARE_WAITQUEUE(wait, current);
 592
 593
 594         if (!event)
 595                 return -EINVAL;
 596
 597         if (list_empty(&acpi_bus_event_list)) {
 598
 599                 set_current_state(TASK_INTERRUPTIBLE);
 600                 add_wait_queue(&acpi_bus_event_queue, &wait);
 601
 602                 if (list_empty(&acpi_bus_event_list))
 603                         schedule();
 604
 605                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 606                 set_current_state(TASK_RUNNING);
 607
 608                 if (signal_pending(current))
 609                         return -ERESTARTSYS;
 610         }
 611
 612         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 613         if (!list_empty(&acpi_bus_event_list)) {
 614                 entry = list_entry(acpi_bus_event_list.next,
 615                                    struct acpi_bus_event, node);
 616                 list_del(&entry->node);
 617         }
 618         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 619
 620         if (!entry)
 621                 return -ENODEV;
 622
 623         memcpy(event, entry, sizeof(struct acpi_bus_event));
 624
 625         kfree(entry);
 626
 627         return 0;
 628 }
 629
 630 #endif  /* CONFIG_ACPI_PROC_EVENT */
 631
 632 /* --------------------------------------------------------------------------
 633                              Notification Handling
 634    -------------------------------------------------------------------------- */
 635
 636 static void acpi_bus_check_device(acpi_handle handle)
 637 {
 638         struct acpi_device *device;
 639         acpi_status status;
 640         struct acpi_device_status old_status;
 641
 642         if (acpi_bus_get_device(handle, &device))
 643                 return;
 644         if (!device)
 645                 return;
 646
 647         old_status = device->status;
 648
 649         /*
 650          * Make sure this device's parent is present before we go about
 651          * messing with the device.
 652          */
 653         if (device->parent && !device->parent->status.present) {
 654                 device->status = device->parent->status;
 655                 return;
 656         }
 657
 658         status = acpi_bus_get_status(device);
 659         if (ACPI_FAILURE(status))
 660                 return;
 661
 662         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 663                 return;
 664
 665         /*
 666          * Device Insertion/Removal
 667          */
 668         if ((device->status.present) && !(old_status.present)) {
 669                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 670                 /* TBD: Handle device insertion */
 671         } else if (!(device->status.present) && (old_status.present)) {
 672                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 673                 /* TBD: Handle device removal */
 674         }
 675 }
 676
 677 static void acpi_bus_check_scope(acpi_handle handle)
 678 {
 679         /* Status Change? */
 680         acpi_bus_check_device(handle);
 681
 682         /*
 683          * TBD: Enumerate child devices within this device's scope and
 684          *       run acpi_bus_check_device()'s on them.
 685          */
 686 }
 687
 688 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 689 int register_acpi_bus_notifier(struct notifier_block *nb)
 690 {
 691         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 692 }
 693 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 694
 695 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 696 {
 697         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 698 }
 699 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 700
 701 /**
 702  * acpi_bus_notify
 703  * ---------------
 704  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 705  */
 706 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 707 {
 708         struct acpi_device *device = NULL;
 709         struct acpi_driver *driver;
 710
 711         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 712                           type, handle));
 713
 714         blocking_notifier_call_chain(&acpi_bus_notify_list,
 715                 type, (void *)handle);
 716
 717         switch (type) {
 718
 719         case ACPI_NOTIFY_BUS_CHECK:
 720                 acpi_bus_check_scope(handle);
 721                 /*
 722                  * TBD: We'll need to outsource certain events to non-ACPI
 723                  *      drivers via the device manager (device.c).
 724                  */
 725                 break;
 726
 727         case ACPI_NOTIFY_DEVICE_CHECK:
 728                 acpi_bus_check_device(handle);
 729                 /*
 730                  * TBD: We'll need to outsource certain events to non-ACPI
 731                  *      drivers via the device manager (device.c).
 732                  */
 733                 break;
 734
 735         case ACPI_NOTIFY_DEVICE_WAKE:
 736                 /* TBD */
 737                 break;
 738
 739         case ACPI_NOTIFY_EJECT_REQUEST:
 740                 /* TBD */
 741                 break;
 742
 743         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 744                 /* TBD: Exactly what does 'light' mean? */
 745                 break;
 746
 747         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 748                 /* TBD */
 749                 break;
 750
 751         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 752                 /* TBD */
 753                 break;
 754
 755         case ACPI_NOTIFY_POWER_FAULT:
 756                 /* TBD */
 757                 break;
 758
 759         default:
 760                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 761                                   "Received unknown/unsupported notification [%08x]\n",
 762                                   type));
 763                 break;
 764         }
 765
 766         acpi_bus_get_device(handle, &device);
 767         if (device) {
 768                 driver = device->driver;
 769                 if (driver && driver->ops.notify &&
 770                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 771                         driver->ops.notify(device, type);
 772         }
 773 }
 774
 775 /* --------------------------------------------------------------------------
 776                              Initialization/Cleanup
 777    -------------------------------------------------------------------------- */
 778
 779 static int __init acpi_bus_init_irq(void)
 780 {
 781         acpi_status status = AE_OK;
 782         union acpi_object arg = { ACPI_TYPE_INTEGER };
 783         struct acpi_object_list arg_list = { 1, &arg };
 784         char *message = NULL;
 785
 786
 787         /*
 788          * Let the system know what interrupt model we are using by
 789          * evaluating the \_PIC object, if exists.
 790          */
 791
 792         switch (acpi_irq_model) {
 793         case ACPI_IRQ_MODEL_PIC:
 794                 message = "PIC";
 795                 break;
 796         case ACPI_IRQ_MODEL_IOAPIC:
 797                 message = "IOAPIC";
 798                 break;
 799         case ACPI_IRQ_MODEL_IOSAPIC:
 800                 message = "IOSAPIC";
 801                 break;
 802         case ACPI_IRQ_MODEL_PLATFORM:
 803                 message = "platform specific model";
 804                 break;
 805         default:
 806                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 807                 return -ENODEV;
 808         }
 809
 810         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 811
 812         arg.integer.value = acpi_irq_model;
 813
 814         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 815         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 816                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 817                 return -ENODEV;
 818         }
 819
 820         return 0;
 821 }
 822
 823 u8 acpi_gbl_permanent_mmap;
 824
 825
 826 void __init acpi_early_init(void)
 827 {
 828         acpi_status status = AE_OK;
 829
 830         if (acpi_disabled)
 831                 return;
 832
 833         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 834
 835         /* enable workarounds, unless strict ACPI spec. compliance */
 836         if (!acpi_strict)
 837                 acpi_gbl_enable_interpreter_slack = TRUE;
 838
 839         acpi_gbl_permanent_mmap = 1;
 840
 841         /*
 842          * If the machine falls into the DMI check table,
 843          * DSDT will be copied to memory
 844          */
 845         dmi_check_system(dsdt_dmi_table);
 846
 847         status = acpi_reallocate_root_table();
 848         if (ACPI_FAILURE(status)) {
 849                 printk(KERN_ERR PREFIX
 850                        "Unable to reallocate ACPI tables\n");
 851                 goto error0;
 852         }
 853
 854         status = acpi_initialize_subsystem();
 855         if (ACPI_FAILURE(status)) {
 856                 printk(KERN_ERR PREFIX
 857                        "Unable to initialize the ACPI Interpreter\n");
 858                 goto error0;
 859         }
 860
 861         status = acpi_load_tables();
 862         if (ACPI_FAILURE(status)) {
 863                 printk(KERN_ERR PREFIX
 864                        "Unable to load the System Description Tables\n");
 865                 goto error0;
 866         }
 867
 868 #ifdef CONFIG_X86
 869         if (!acpi_ioapic) {
 870                 /* compatible (0) means level (3) */
 871                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 872                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 873                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 874                 }
 875                 /* Set PIC-mode SCI trigger type */
 876                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 877                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 878         } else {
 879                 /*
 880                  * now that acpi_gbl_FADT is initialized,
 881                  * update it with result from INT_SRC_OVR parsing
 882                  */
 883                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 884         }
 885 #endif
 886
 887         status =
 888             acpi_enable_subsystem(~
 889                                   (ACPI_NO_HARDWARE_INIT |
 890                                    ACPI_NO_ACPI_ENABLE));
 891         if (ACPI_FAILURE(status)) {
 892                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 893                 goto error0;
 894         }
 895
 896         return;
 897
 898       error0:
 899         disable_acpi();
 900         return;
 901 }
 902
 903 static int __init acpi_bus_init(void)
 904 {
 905         int result = 0;
 906         acpi_status status = AE_OK;
 907         extern acpi_status acpi_os_initialize1(void);
 908
 909         acpi_os_initialize1();
 910
 911         status =
 912             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 913         if (ACPI_FAILURE(status)) {
 914                 printk(KERN_ERR PREFIX
 915                        "Unable to start the ACPI Interpreter\n");
 916                 goto error1;
 917         }
 918
 919         /*
 920          * ACPI 2.0 requires the EC driver to be loaded and work before
 921          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 922          * is called).
 923          *
 924          * This is accomplished by looking for the ECDT table, and getting
 925          * the EC parameters out of that.
 926          */
 927         status = acpi_ec_ecdt_probe();
 928         /* Ignore result. Not having an ECDT is not fatal. */
 929
 930         acpi_bus_osc_support();
 931
 932         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 933         if (ACPI_FAILURE(status)) {
 934                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 935                 goto error1;
 936         }
 937
 938         /*
 939          * _PDC control method may load dynamic SSDT tables,
 940          * and we need to install the table handler before that.
 941          */
 942         acpi_sysfs_init();
 943
 944         acpi_early_processor_set_pdc();
 945
 946         /*
 947          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 948          * is necessary to enable it as early as possible.
 949          */
 950         acpi_boot_ec_enable();
 951
 952         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 953
 954         /* Initialize sleep structures */
 955         acpi_sleep_init();
 956
 957         /*
 958          * Get the system interrupt model and evaluate \_PIC.
 959          */
 960         result = acpi_bus_init_irq();
 961         if (result)
 962                 goto error1;
 963
 964         /*
 965          * Register the for all standard device notifications.
 966          */
 967         status =
 968             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 969                                         &acpi_bus_notify, NULL);
 970         if (ACPI_FAILURE(status)) {
 971                 printk(KERN_ERR PREFIX
 972                        "Unable to register for device notifications\n");
 973                 goto error1;
 974         }
 975
 976         /*
 977          * Create the top ACPI proc directory
 978          */
 979         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 980
 981         return 0;
 982
 983         /* Mimic structured exception handling */
 984       error1:
 985         acpi_terminate();
 986         return -ENODEV;
 987 }
 988
 989 struct kobject *acpi_kobj;
 990
 991 static int __init acpi_init(void)
 992 {
 993         int result = 0;
 994
 995
 996         if (acpi_disabled) {
 997                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 998                 return -ENODEV;
 999         }
1000
1001         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1002         if (!acpi_kobj) {
1003                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1004                 acpi_kobj = NULL;
1005         }
1006
1007         init_acpi_device_notify();
1008         result = acpi_bus_init();
1009
1010         if (!result) {
1011                 pci_mmcfg_late_init();
1012                 if (!(pm_flags & PM_APM))
1013                         pm_flags |= PM_ACPI;
1014                 else {
1015                         printk(KERN_INFO PREFIX
1016                                "APM is already active, exiting\n");
1017                         disable_acpi();
1018                         result = -ENODEV;
1019                 }
1020         } else
1021                 disable_acpi();
1022
1023         if (acpi_disabled)
1024                 return result;
1025
1026         /*
1027          * If the laptop falls into the DMI check table, the power state check
1028          * will be disabled in the course of device power transition.
1029          */
1030         dmi_check_system(power_nocheck_dmi_table);
1031
1032         acpi_scan_init();
1033         acpi_ec_init();
1034         acpi_power_init();
1035         acpi_debugfs_init();
1036         acpi_sleep_proc_init();
1037         acpi_wakeup_device_init();
1038         return result;
1039 }
1040
1041 subsys_initcall(acpi_init);