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 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 200 {
 201         int result = 0;
 202         acpi_status status = 0;
 203         unsigned long long psc = 0;
 204
 205         if (!device || !state)
 206                 return -EINVAL;
 207
 208         *state = ACPI_STATE_UNKNOWN;
 209
 210         if (device->flags.power_manageable) {
 211                 /*
 212                  * Get the device's power state either directly (via _PSC) or
 213                  * indirectly (via power resources).
 214                  */
 215                 if (device->power.flags.power_resources) {
 216                         result = acpi_power_get_inferred_state(device, state);
 217                         if (result)
 218                                 return result;
 219                 } else if (device->power.flags.explicit_get) {
 220                         status = acpi_evaluate_integer(device->handle, "_PSC",
 221                                                        NULL, &psc);
 222                         if (ACPI_FAILURE(status))
 223                                 return -ENODEV;
 224                         *state = (int)psc;
 225                 }
 226         } else {
 227                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 228                 *state = device->parent ?
 229                         device->parent->power.state : ACPI_STATE_D0;
 230         }
 231
 232         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 233                           device->pnp.bus_id, *state));
 234
 235         return 0;
 236 }
 237
 238
 239 int acpi_bus_get_power(acpi_handle handle, int *state)
 240 {
 241         struct acpi_device *device;
 242         int result;
 243
 244         result = acpi_bus_get_device(handle, &device);
 245         if (result)
 246                 return result;
 247
 248         result = __acpi_bus_get_power(device, state);
 249         if (result)
 250                 return result;
 251
 252         device->power.state = *state;
 253         return 0;
 254 }
 255 EXPORT_SYMBOL(acpi_bus_get_power);
 256
 257
 258 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 259 {
 260         int result = 0;
 261         acpi_status status = AE_OK;
 262         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 263
 264         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 265                 return -EINVAL;
 266
 267         /* Make sure this is a valid target state */
 268
 269         if ((state == device->power.state) && !device->flags.force_power_state) {
 270                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 271                                   state));
 272                 return 0;
 273         }
 274
 275         if (!device->power.states[state].flags.valid) {
 276                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 277                 return -ENODEV;
 278         }
 279         if (device->parent && (state < device->parent->power.state)) {
 280                 printk(KERN_WARNING PREFIX
 281                               "Cannot set device to a higher-powered"
 282                               " state than parent\n");
 283                 return -ENODEV;
 284         }
 285
 286         /*
 287          * Transition Power
 288          * ----------------
 289          * On transitions to a high-powered state we first apply power (via
 290          * power resources) then evalute _PSx.  Conversly for transitions to
 291          * a lower-powered state.
 292          */
 293         if (state < device->power.state) {
 294                 if (device->power.flags.power_resources) {
 295                         result = acpi_power_transition(device, state);
 296                         if (result)
 297                                 goto end;
 298                 }
 299                 if (device->power.states[state].flags.explicit_set) {
 300                         status = acpi_evaluate_object(device->handle,
 301                                                       object_name, NULL, NULL);
 302                         if (ACPI_FAILURE(status)) {
 303                                 result = -ENODEV;
 304                                 goto end;
 305                         }
 306                 }
 307         } else {
 308                 if (device->power.states[state].flags.explicit_set) {
 309                         status = acpi_evaluate_object(device->handle,
 310                                                       object_name, NULL, NULL);
 311                         if (ACPI_FAILURE(status)) {
 312                                 result = -ENODEV;
 313                                 goto end;
 314                         }
 315                 }
 316                 if (device->power.flags.power_resources) {
 317                         result = acpi_power_transition(device, state);
 318                         if (result)
 319                                 goto end;
 320                 }
 321         }
 322
 323       end:
 324         if (result)
 325                 printk(KERN_WARNING PREFIX
 326                               "Device [%s] failed to transition to D%d\n",
 327                               device->pnp.bus_id, state);
 328         else {
 329                 device->power.state = state;
 330                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 331                                   "Device [%s] transitioned to D%d\n",
 332                                   device->pnp.bus_id, state));
 333         }
 334
 335         return result;
 336 }
 337
 338
 339 int acpi_bus_set_power(acpi_handle handle, int state)
 340 {
 341         struct acpi_device *device;
 342         int result;
 343
 344         result = acpi_bus_get_device(handle, &device);
 345         if (result)
 346                 return result;
 347
 348         if (!device->flags.power_manageable) {
 349                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 350                                 "Device [%s] is not power manageable\n",
 351                                 dev_name(&device->dev)));
 352                 return -ENODEV;
 353         }
 354
 355         /*
 356          * Get device's current power state
 357          */
 358         if (!acpi_power_nocheck) {
 359                 /*
 360                  * Maybe the incorrect power state is returned on the bogus
 361                  * bios, which is different with the real power state.
 362                  * For example: the bios returns D0 state and the real power
 363                  * state is D3. OS expects to set the device to D0 state. In
 364                  * such case if OS uses the power state returned by the BIOS,
 365                  * the device can't be transisted to the correct power state.
 366                  * So if the acpi_power_nocheck is set, it is unnecessary to
 367                  * get the power state by calling acpi_bus_get_power.
 368                  */
 369                 __acpi_bus_get_power(device, &device->power.state);
 370         }
 371
 372         return __acpi_bus_set_power(device, state);
 373 }
 374 EXPORT_SYMBOL(acpi_bus_set_power);
 375
 376
 377 int acpi_bus_init_power(struct acpi_device *device)
 378 {
 379         int state;
 380         int result;
 381
 382         if (!device)
 383                 return -EINVAL;
 384
 385         device->power.state = ACPI_STATE_UNKNOWN;
 386
 387         result = __acpi_bus_get_power(device, &state);
 388         if (result)
 389                 return result;
 390
 391         if (device->power.flags.power_resources)
 392                 result = acpi_power_on_resources(device, state);
 393
 394         if (!result)
 395                 device->power.state = state;
 396
 397         return result;
 398 }
 399
 400
 401 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 402 {
 403         struct acpi_device *device;
 404         int state;
 405         int result;
 406
 407         result = acpi_bus_get_device(handle, &device);
 408         if (result)
 409                 return result;
 410
 411         result = __acpi_bus_get_power(device, &state);
 412         if (result)
 413                 return result;
 414
 415         result = __acpi_bus_set_power(device, state);
 416         if (!result && state_p)
 417                 *state_p = state;
 418
 419         return result;
 420 }
 421 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 422
 423
 424 bool acpi_bus_power_manageable(acpi_handle handle)
 425 {
 426         struct acpi_device *device;
 427         int result;
 428
 429         result = acpi_bus_get_device(handle, &device);
 430         return result ? false : device->flags.power_manageable;
 431 }
 432
 433 EXPORT_SYMBOL(acpi_bus_power_manageable);
 434
 435 bool acpi_bus_can_wakeup(acpi_handle handle)
 436 {
 437         struct acpi_device *device;
 438         int result;
 439
 440         result = acpi_bus_get_device(handle, &device);
 441         return result ? false : device->wakeup.flags.valid;
 442 }
 443
 444 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 445
 446 static void acpi_print_osc_error(acpi_handle handle,
 447         struct acpi_osc_context *context, char *error)
 448 {
 449         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 450         int i;
 451
 452         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 453                 printk(KERN_DEBUG "%s\n", error);
 454         else {
 455                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 456                 kfree(buffer.pointer);
 457         }
 458         printk(KERN_DEBUG"_OSC request data:");
 459         for (i = 0; i < context->cap.length; i += sizeof(u32))
 460                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 461         printk("\n");
 462 }
 463
 464 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 465 {
 466         int i;
 467         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 468                 24, 26, 28, 30, 32, 34};
 469
 470         if (strlen(str) != 36)
 471                 return AE_BAD_PARAMETER;
 472         for (i = 0; i < 36; i++) {
 473                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 474                         if (str[i] != '-')
 475                                 return AE_BAD_PARAMETER;
 476                 } else if (!isxdigit(str[i]))
 477                         return AE_BAD_PARAMETER;
 478         }
 479         for (i = 0; i < 16; i++) {
 480                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 481                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 482         }
 483         return AE_OK;
 484 }
 485
 486 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 487 {
 488         acpi_status status;
 489         struct acpi_object_list input;
 490         union acpi_object in_params[4];
 491         union acpi_object *out_obj;
 492         u8 uuid[16];
 493         u32 errors;
 494         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 495
 496         if (!context)
 497                 return AE_ERROR;
 498         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 499                 return AE_ERROR;
 500         context->ret.length = ACPI_ALLOCATE_BUFFER;
 501         context->ret.pointer = NULL;
 502
 503         /* Setting up input parameters */
 504         input.count = 4;
 505         input.pointer = in_params;
 506         in_params[0].type               = ACPI_TYPE_BUFFER;
 507         in_params[0].buffer.length      = 16;
 508         in_params[0].buffer.pointer     = uuid;
 509         in_params[1].type               = ACPI_TYPE_INTEGER;
 510         in_params[1].integer.value      = context->rev;
 511         in_params[2].type               = ACPI_TYPE_INTEGER;
 512         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 513         in_params[3].type               = ACPI_TYPE_BUFFER;
 514         in_params[3].buffer.length      = context->cap.length;
 515         in_params[3].buffer.pointer     = context->cap.pointer;
 516
 517         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 518         if (ACPI_FAILURE(status))
 519                 return status;
 520
 521         if (!output.length)
 522                 return AE_NULL_OBJECT;
 523
 524         out_obj = output.pointer;
 525         if (out_obj->type != ACPI_TYPE_BUFFER
 526                 || out_obj->buffer.length != context->cap.length) {
 527                 acpi_print_osc_error(handle, context,
 528                         "_OSC evaluation returned wrong type");
 529                 status = AE_TYPE;
 530                 goto out_kfree;
 531         }
 532         /* Need to ignore the bit0 in result code */
 533         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 534         if (errors) {
 535                 if (errors & OSC_REQUEST_ERROR)
 536                         acpi_print_osc_error(handle, context,
 537                                 "_OSC request failed");
 538                 if (errors & OSC_INVALID_UUID_ERROR)
 539                         acpi_print_osc_error(handle, context,
 540                                 "_OSC invalid UUID");
 541                 if (errors & OSC_INVALID_REVISION_ERROR)
 542                         acpi_print_osc_error(handle, context,
 543                                 "_OSC invalid revision");
 544                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 545                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 546                             & OSC_QUERY_ENABLE)
 547                                 goto out_success;
 548                         status = AE_SUPPORT;
 549                         goto out_kfree;
 550                 }
 551                 status = AE_ERROR;
 552                 goto out_kfree;
 553         }
 554 out_success:
 555         context->ret.length = out_obj->buffer.length;
 556         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 557         if (!context->ret.pointer) {
 558                 status =  AE_NO_MEMORY;
 559                 goto out_kfree;
 560         }
 561         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 562                 context->ret.length);
 563         status =  AE_OK;
 564
 565 out_kfree:
 566         kfree(output.pointer);
 567         if (status != AE_OK)
 568                 context->ret.pointer = NULL;
 569         return status;
 570 }
 571 EXPORT_SYMBOL(acpi_run_osc);
 572
 573 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 574 static void acpi_bus_osc_support(void)
 575 {
 576         u32 capbuf[2];
 577         struct acpi_osc_context context = {
 578                 .uuid_str = sb_uuid_str,
 579                 .rev = 1,
 580                 .cap.length = 8,
 581                 .cap.pointer = capbuf,
 582         };
 583         acpi_handle handle;
 584
 585         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 586         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 587 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 588                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 589         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 590 #endif
 591
 592 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 593         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 594 #endif
 595         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 596                 return;
 597         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 598                 kfree(context.ret.pointer);
 599         /* do we need to check the returned cap? Sounds no */
 600 }
 601
 602 /* --------------------------------------------------------------------------
 603                                 Event Management
 604    -------------------------------------------------------------------------- */
 605
 606 #ifdef CONFIG_ACPI_PROC_EVENT
 607 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 608
 609 LIST_HEAD(acpi_bus_event_list);
 610 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 611
 612 extern int event_is_open;
 613
 614 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 615 {
 616         struct acpi_bus_event *event;
 617         unsigned long flags = 0;
 618
 619         /* drop event on the floor if no one's listening */
 620         if (!event_is_open)
 621                 return 0;
 622
 623         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 624         if (!event)
 625                 return -ENOMEM;
 626
 627         strcpy(event->device_class, device_class);
 628         strcpy(event->bus_id, bus_id);
 629         event->type = type;
 630         event->data = data;
 631
 632         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 633         list_add_tail(&event->node, &acpi_bus_event_list);
 634         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 635
 636         wake_up_interruptible(&acpi_bus_event_queue);
 637
 638         return 0;
 639
 640 }
 641
 642 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 643
 644 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 645 {
 646         if (!device)
 647                 return -EINVAL;
 648         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 649                                              device->pnp.bus_id, type, data);
 650 }
 651
 652 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 653
 654 int acpi_bus_receive_event(struct acpi_bus_event *event)
 655 {
 656         unsigned long flags = 0;
 657         struct acpi_bus_event *entry = NULL;
 658
 659         DECLARE_WAITQUEUE(wait, current);
 660
 661
 662         if (!event)
 663                 return -EINVAL;
 664
 665         if (list_empty(&acpi_bus_event_list)) {
 666
 667                 set_current_state(TASK_INTERRUPTIBLE);
 668                 add_wait_queue(&acpi_bus_event_queue, &wait);
 669
 670                 if (list_empty(&acpi_bus_event_list))
 671                         schedule();
 672
 673                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 674                 set_current_state(TASK_RUNNING);
 675
 676                 if (signal_pending(current))
 677                         return -ERESTARTSYS;
 678         }
 679
 680         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 681         if (!list_empty(&acpi_bus_event_list)) {
 682                 entry = list_entry(acpi_bus_event_list.next,
 683                                    struct acpi_bus_event, node);
 684                 list_del(&entry->node);
 685         }
 686         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 687
 688         if (!entry)
 689                 return -ENODEV;
 690
 691         memcpy(event, entry, sizeof(struct acpi_bus_event));
 692
 693         kfree(entry);
 694
 695         return 0;
 696 }
 697
 698 #endif  /* CONFIG_ACPI_PROC_EVENT */
 699
 700 /* --------------------------------------------------------------------------
 701                              Notification Handling
 702    -------------------------------------------------------------------------- */
 703
 704 static void acpi_bus_check_device(acpi_handle handle)
 705 {
 706         struct acpi_device *device;
 707         acpi_status status;
 708         struct acpi_device_status old_status;
 709
 710         if (acpi_bus_get_device(handle, &device))
 711                 return;
 712         if (!device)
 713                 return;
 714
 715         old_status = device->status;
 716
 717         /*
 718          * Make sure this device's parent is present before we go about
 719          * messing with the device.
 720          */
 721         if (device->parent && !device->parent->status.present) {
 722                 device->status = device->parent->status;
 723                 return;
 724         }
 725
 726         status = acpi_bus_get_status(device);
 727         if (ACPI_FAILURE(status))
 728                 return;
 729
 730         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 731                 return;
 732
 733         /*
 734          * Device Insertion/Removal
 735          */
 736         if ((device->status.present) && !(old_status.present)) {
 737                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 738                 /* TBD: Handle device insertion */
 739         } else if (!(device->status.present) && (old_status.present)) {
 740                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 741                 /* TBD: Handle device removal */
 742         }
 743 }
 744
 745 static void acpi_bus_check_scope(acpi_handle handle)
 746 {
 747         /* Status Change? */
 748         acpi_bus_check_device(handle);
 749
 750         /*
 751          * TBD: Enumerate child devices within this device's scope and
 752          *       run acpi_bus_check_device()'s on them.
 753          */
 754 }
 755
 756 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 757 int register_acpi_bus_notifier(struct notifier_block *nb)
 758 {
 759         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 760 }
 761 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 762
 763 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 764 {
 765         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 766 }
 767 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 768
 769 /**
 770  * acpi_bus_notify
 771  * ---------------
 772  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 773  */
 774 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 775 {
 776         struct acpi_device *device = NULL;
 777         struct acpi_driver *driver;
 778
 779         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 780                           type, handle));
 781
 782         blocking_notifier_call_chain(&acpi_bus_notify_list,
 783                 type, (void *)handle);
 784
 785         switch (type) {
 786
 787         case ACPI_NOTIFY_BUS_CHECK:
 788                 acpi_bus_check_scope(handle);
 789                 /*
 790                  * TBD: We'll need to outsource certain events to non-ACPI
 791                  *      drivers via the device manager (device.c).
 792                  */
 793                 break;
 794
 795         case ACPI_NOTIFY_DEVICE_CHECK:
 796                 acpi_bus_check_device(handle);
 797                 /*
 798                  * TBD: We'll need to outsource certain events to non-ACPI
 799                  *      drivers via the device manager (device.c).
 800                  */
 801                 break;
 802
 803         case ACPI_NOTIFY_DEVICE_WAKE:
 804                 /* TBD */
 805                 break;
 806
 807         case ACPI_NOTIFY_EJECT_REQUEST:
 808                 /* TBD */
 809                 break;
 810
 811         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 812                 /* TBD: Exactly what does 'light' mean? */
 813                 break;
 814
 815         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 816                 /* TBD */
 817                 break;
 818
 819         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 820                 /* TBD */
 821                 break;
 822
 823         case ACPI_NOTIFY_POWER_FAULT:
 824                 /* TBD */
 825                 break;
 826
 827         default:
 828                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 829                                   "Received unknown/unsupported notification [%08x]\n",
 830                                   type));
 831                 break;
 832         }
 833
 834         acpi_bus_get_device(handle, &device);
 835         if (device) {
 836                 driver = device->driver;
 837                 if (driver && driver->ops.notify &&
 838                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 839                         driver->ops.notify(device, type);
 840         }
 841 }
 842
 843 /* --------------------------------------------------------------------------
 844                              Initialization/Cleanup
 845    -------------------------------------------------------------------------- */
 846
 847 static int __init acpi_bus_init_irq(void)
 848 {
 849         acpi_status status = AE_OK;
 850         union acpi_object arg = { ACPI_TYPE_INTEGER };
 851         struct acpi_object_list arg_list = { 1, &arg };
 852         char *message = NULL;
 853
 854
 855         /*
 856          * Let the system know what interrupt model we are using by
 857          * evaluating the \_PIC object, if exists.
 858          */
 859
 860         switch (acpi_irq_model) {
 861         case ACPI_IRQ_MODEL_PIC:
 862                 message = "PIC";
 863                 break;
 864         case ACPI_IRQ_MODEL_IOAPIC:
 865                 message = "IOAPIC";
 866                 break;
 867         case ACPI_IRQ_MODEL_IOSAPIC:
 868                 message = "IOSAPIC";
 869                 break;
 870         case ACPI_IRQ_MODEL_PLATFORM:
 871                 message = "platform specific model";
 872                 break;
 873         default:
 874                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 875                 return -ENODEV;
 876         }
 877
 878         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 879
 880         arg.integer.value = acpi_irq_model;
 881
 882         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 883         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 884                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 885                 return -ENODEV;
 886         }
 887
 888         return 0;
 889 }
 890
 891 u8 acpi_gbl_permanent_mmap;
 892
 893
 894 void __init acpi_early_init(void)
 895 {
 896         acpi_status status = AE_OK;
 897
 898         if (acpi_disabled)
 899                 return;
 900
 901         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 902
 903         /* enable workarounds, unless strict ACPI spec. compliance */
 904         if (!acpi_strict)
 905                 acpi_gbl_enable_interpreter_slack = TRUE;
 906
 907         acpi_gbl_permanent_mmap = 1;
 908
 909         /*
 910          * If the machine falls into the DMI check table,
 911          * DSDT will be copied to memory
 912          */
 913         dmi_check_system(dsdt_dmi_table);
 914
 915         status = acpi_reallocate_root_table();
 916         if (ACPI_FAILURE(status)) {
 917                 printk(KERN_ERR PREFIX
 918                        "Unable to reallocate ACPI tables\n");
 919                 goto error0;
 920         }
 921
 922         status = acpi_initialize_subsystem();
 923         if (ACPI_FAILURE(status)) {
 924                 printk(KERN_ERR PREFIX
 925                        "Unable to initialize the ACPI Interpreter\n");
 926                 goto error0;
 927         }
 928
 929         status = acpi_load_tables();
 930         if (ACPI_FAILURE(status)) {
 931                 printk(KERN_ERR PREFIX
 932                        "Unable to load the System Description Tables\n");
 933                 goto error0;
 934         }
 935
 936 #ifdef CONFIG_X86
 937         if (!acpi_ioapic) {
 938                 /* compatible (0) means level (3) */
 939                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 940                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 941                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 942                 }
 943                 /* Set PIC-mode SCI trigger type */
 944                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 945                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 946         } else {
 947                 /*
 948                  * now that acpi_gbl_FADT is initialized,
 949                  * update it with result from INT_SRC_OVR parsing
 950                  */
 951                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 952         }
 953 #endif
 954
 955         status =
 956             acpi_enable_subsystem(~
 957                                   (ACPI_NO_HARDWARE_INIT |
 958                                    ACPI_NO_ACPI_ENABLE));
 959         if (ACPI_FAILURE(status)) {
 960                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 961                 goto error0;
 962         }
 963
 964         return;
 965
 966       error0:
 967         disable_acpi();
 968         return;
 969 }
 970
 971 static int __init acpi_bus_init(void)
 972 {
 973         int result = 0;
 974         acpi_status status = AE_OK;
 975         extern acpi_status acpi_os_initialize1(void);
 976
 977         acpi_os_initialize1();
 978
 979         status =
 980             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 981         if (ACPI_FAILURE(status)) {
 982                 printk(KERN_ERR PREFIX
 983                        "Unable to start the ACPI Interpreter\n");
 984                 goto error1;
 985         }
 986
 987         /*
 988          * ACPI 2.0 requires the EC driver to be loaded and work before
 989          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 990          * is called).
 991          *
 992          * This is accomplished by looking for the ECDT table, and getting
 993          * the EC parameters out of that.
 994          */
 995         status = acpi_ec_ecdt_probe();
 996         /* Ignore result. Not having an ECDT is not fatal. */
 997
 998         acpi_bus_osc_support();
 999
1000         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1001         if (ACPI_FAILURE(status)) {
1002                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1003                 goto error1;
1004         }
1005
1006         /*
1007          * _PDC control method may load dynamic SSDT tables,
1008          * and we need to install the table handler before that.
1009          */
1010         acpi_sysfs_init();
1011
1012         acpi_early_processor_set_pdc();
1013
1014         /*
1015          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1016          * is necessary to enable it as early as possible.
1017          */
1018         acpi_boot_ec_enable();
1019
1020         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1021
1022         /* Initialize sleep structures */
1023         acpi_sleep_init();
1024
1025         /*
1026          * Get the system interrupt model and evaluate \_PIC.
1027          */
1028         result = acpi_bus_init_irq();
1029         if (result)
1030                 goto error1;
1031
1032         /*
1033          * Register the for all standard device notifications.
1034          */
1035         status =
1036             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1037                                         &acpi_bus_notify, NULL);
1038         if (ACPI_FAILURE(status)) {
1039                 printk(KERN_ERR PREFIX
1040                        "Unable to register for device notifications\n");
1041                 goto error1;
1042         }
1043
1044         /*
1045          * Create the top ACPI proc directory
1046          */
1047         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1048
1049         return 0;
1050
1051         /* Mimic structured exception handling */
1052       error1:
1053         acpi_terminate();
1054         return -ENODEV;
1055 }
1056
1057 struct kobject *acpi_kobj;
1058
1059 static int __init acpi_init(void)
1060 {
1061         int result = 0;
1062
1063
1064         if (acpi_disabled) {
1065                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1066                 return -ENODEV;
1067         }
1068
1069         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1070         if (!acpi_kobj) {
1071                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1072                 acpi_kobj = NULL;
1073         }
1074
1075         init_acpi_device_notify();
1076         result = acpi_bus_init();
1077
1078         if (!result) {
1079                 pci_mmcfg_late_init();
1080                 if (!(pm_flags & PM_APM))
1081                         pm_flags |= PM_ACPI;
1082                 else {
1083                         printk(KERN_INFO PREFIX
1084                                "APM is already active, exiting\n");
1085                         disable_acpi();
1086                         result = -ENODEV;
1087                 }
1088         } else
1089                 disable_acpi();
1090
1091         if (acpi_disabled)
1092                 return result;
1093
1094         /*
1095          * If the laptop falls into the DMI check table, the power state check
1096          * will be disabled in the course of device power transition.
1097          */
1098         dmi_check_system(power_nocheck_dmi_table);
1099
1100         acpi_scan_init();
1101         acpi_ec_init();
1102         acpi_debugfs_init();
1103         acpi_sleep_proc_init();
1104         acpi_wakeup_device_init();
1105         return result;
1106 }
1107
1108 subsys_initcall(acpi_init);