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
  56 #ifdef CONFIG_X86
  57 static int set_copy_dsdt(const struct dmi_system_id *id)
  58 {
  59         printk(KERN_NOTICE "%s detected - "
  60                 "force copy of DSDT to local memory\n", id->ident);
  61         acpi_gbl_copy_dsdt_locally = 1;
  62         return 0;
  63 }
  64
  65 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  66         /*
  67          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  68          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  69          */
  70         {
  71          .callback = set_copy_dsdt,
  72          .ident = "TOSHIBA Satellite",
  73          .matches = {
  74                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  75                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  76                 },
  77         },
  78         {}
  79 };
  80 #else
  81 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  82         {}
  83 };
  84 #endif
  85
  86 /* --------------------------------------------------------------------------
  87                                 Device Management
  88    -------------------------------------------------------------------------- */
  89
  90 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  91 {
  92         acpi_status status = AE_OK;
  93
  94
  95         if (!device)
  96                 return -EINVAL;
  97
  98         /* TBD: Support fixed-feature devices */
  99
 100         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 101         if (ACPI_FAILURE(status) || !*device) {
 102                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 103                                   handle));
 104                 return -ENODEV;
 105         }
 106
 107         return 0;
 108 }
 109
 110 EXPORT_SYMBOL(acpi_bus_get_device);
 111
 112 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 113                                        unsigned long long *sta)
 114 {
 115         acpi_status status;
 116
 117         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 118         if (ACPI_SUCCESS(status))
 119                 return AE_OK;
 120
 121         if (status == AE_NOT_FOUND) {
 122                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 123                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 124                 return AE_OK;
 125         }
 126         return status;
 127 }
 128
 129 int acpi_bus_get_status(struct acpi_device *device)
 130 {
 131         acpi_status status;
 132         unsigned long long sta;
 133
 134         status = acpi_bus_get_status_handle(device->handle, &sta);
 135         if (ACPI_FAILURE(status))
 136                 return -ENODEV;
 137
 138         STRUCT_TO_INT(device->status) = (int) sta;
 139
 140         if (device->status.functional && !device->status.present) {
 141                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 142                        "functional but not present;\n",
 143                         device->pnp.bus_id,
 144                         (u32) STRUCT_TO_INT(device->status)));
 145         }
 146
 147         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 148                           device->pnp.bus_id,
 149                           (u32) STRUCT_TO_INT(device->status)));
 150         return 0;
 151 }
 152 EXPORT_SYMBOL(acpi_bus_get_status);
 153
 154 void acpi_bus_private_data_handler(acpi_handle handle,
 155                                    void *context)
 156 {
 157         return;
 158 }
 159 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 160
 161 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 162 {
 163         acpi_status status = AE_OK;
 164
 165         if (!*data)
 166                 return -EINVAL;
 167
 168         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 169         if (ACPI_FAILURE(status) || !*data) {
 170                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 171                                 handle));
 172                 return -ENODEV;
 173         }
 174
 175         return 0;
 176 }
 177 EXPORT_SYMBOL(acpi_bus_get_private_data);
 178
 179 /* --------------------------------------------------------------------------
 180                                  Power Management
 181    -------------------------------------------------------------------------- */
 182
 183 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 184 {
 185         int result = 0;
 186         acpi_status status = 0;
 187         unsigned long long psc = 0;
 188
 189         if (!device || !state)
 190                 return -EINVAL;
 191
 192         *state = ACPI_STATE_UNKNOWN;
 193
 194         if (device->flags.power_manageable) {
 195                 /*
 196                  * Get the device's power state either directly (via _PSC) or
 197                  * indirectly (via power resources).
 198                  */
 199                 if (device->power.flags.power_resources) {
 200                         result = acpi_power_get_inferred_state(device, state);
 201                         if (result)
 202                                 return result;
 203                 } else if (device->power.flags.explicit_get) {
 204                         status = acpi_evaluate_integer(device->handle, "_PSC",
 205                                                        NULL, &psc);
 206                         if (ACPI_FAILURE(status))
 207                                 return -ENODEV;
 208                         *state = (int)psc;
 209                 }
 210         } else {
 211                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 212                 *state = device->parent ?
 213                         device->parent->power.state : ACPI_STATE_D0;
 214         }
 215
 216         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 217                           device->pnp.bus_id, *state));
 218
 219         return 0;
 220 }
 221
 222
 223 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 224 {
 225         int result = 0;
 226         acpi_status status = AE_OK;
 227         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 228
 229         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 230                 return -EINVAL;
 231
 232         /* Make sure this is a valid target state */
 233
 234         if (state == device->power.state) {
 235                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 236                                   state));
 237                 return 0;
 238         }
 239
 240         if (!device->power.states[state].flags.valid) {
 241                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 242                 return -ENODEV;
 243         }
 244         if (device->parent && (state < device->parent->power.state)) {
 245                 printk(KERN_WARNING PREFIX
 246                               "Cannot set device to a higher-powered"
 247                               " state than parent\n");
 248                 return -ENODEV;
 249         }
 250
 251         /*
 252          * Transition Power
 253          * ----------------
 254          * On transitions to a high-powered state we first apply power (via
 255          * power resources) then evalute _PSx.  Conversly for transitions to
 256          * a lower-powered state.
 257          */
 258         if (state < device->power.state) {
 259                 if (device->power.flags.power_resources) {
 260                         result = acpi_power_transition(device, state);
 261                         if (result)
 262                                 goto end;
 263                 }
 264                 if (device->power.states[state].flags.explicit_set) {
 265                         status = acpi_evaluate_object(device->handle,
 266                                                       object_name, NULL, NULL);
 267                         if (ACPI_FAILURE(status)) {
 268                                 result = -ENODEV;
 269                                 goto end;
 270                         }
 271                 }
 272         } else {
 273                 if (device->power.states[state].flags.explicit_set) {
 274                         status = acpi_evaluate_object(device->handle,
 275                                                       object_name, NULL, NULL);
 276                         if (ACPI_FAILURE(status)) {
 277                                 result = -ENODEV;
 278                                 goto end;
 279                         }
 280                 }
 281                 if (device->power.flags.power_resources) {
 282                         result = acpi_power_transition(device, state);
 283                         if (result)
 284                                 goto end;
 285                 }
 286         }
 287
 288       end:
 289         if (result)
 290                 printk(KERN_WARNING PREFIX
 291                               "Device [%s] failed to transition to D%d\n",
 292                               device->pnp.bus_id, state);
 293         else {
 294                 device->power.state = state;
 295                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 296                                   "Device [%s] transitioned to D%d\n",
 297                                   device->pnp.bus_id, state));
 298         }
 299
 300         return result;
 301 }
 302
 303
 304 int acpi_bus_set_power(acpi_handle handle, int state)
 305 {
 306         struct acpi_device *device;
 307         int result;
 308
 309         result = acpi_bus_get_device(handle, &device);
 310         if (result)
 311                 return result;
 312
 313         if (!device->flags.power_manageable) {
 314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 315                                 "Device [%s] is not power manageable\n",
 316                                 dev_name(&device->dev)));
 317                 return -ENODEV;
 318         }
 319
 320         return __acpi_bus_set_power(device, state);
 321 }
 322 EXPORT_SYMBOL(acpi_bus_set_power);
 323
 324
 325 int acpi_bus_init_power(struct acpi_device *device)
 326 {
 327         int state;
 328         int result;
 329
 330         if (!device)
 331                 return -EINVAL;
 332
 333         device->power.state = ACPI_STATE_UNKNOWN;
 334
 335         result = __acpi_bus_get_power(device, &state);
 336         if (result)
 337                 return result;
 338
 339         if (device->power.flags.power_resources)
 340                 result = acpi_power_on_resources(device, state);
 341
 342         if (!result)
 343                 device->power.state = state;
 344
 345         return result;
 346 }
 347
 348
 349 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 350 {
 351         struct acpi_device *device;
 352         int state;
 353         int result;
 354
 355         result = acpi_bus_get_device(handle, &device);
 356         if (result)
 357                 return result;
 358
 359         result = __acpi_bus_get_power(device, &state);
 360         if (result)
 361                 return result;
 362
 363         result = __acpi_bus_set_power(device, state);
 364         if (!result && state_p)
 365                 *state_p = state;
 366
 367         return result;
 368 }
 369 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 370
 371
 372 bool acpi_bus_power_manageable(acpi_handle handle)
 373 {
 374         struct acpi_device *device;
 375         int result;
 376
 377         result = acpi_bus_get_device(handle, &device);
 378         return result ? false : device->flags.power_manageable;
 379 }
 380
 381 EXPORT_SYMBOL(acpi_bus_power_manageable);
 382
 383 bool acpi_bus_can_wakeup(acpi_handle handle)
 384 {
 385         struct acpi_device *device;
 386         int result;
 387
 388         result = acpi_bus_get_device(handle, &device);
 389         return result ? false : device->wakeup.flags.valid;
 390 }
 391
 392 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 393
 394 static void acpi_print_osc_error(acpi_handle handle,
 395         struct acpi_osc_context *context, char *error)
 396 {
 397         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 398         int i;
 399
 400         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 401                 printk(KERN_DEBUG "%s\n", error);
 402         else {
 403                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 404                 kfree(buffer.pointer);
 405         }
 406         printk(KERN_DEBUG"_OSC request data:");
 407         for (i = 0; i < context->cap.length; i += sizeof(u32))
 408                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 409         printk("\n");
 410 }
 411
 412 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 413 {
 414         int i;
 415         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 416                 24, 26, 28, 30, 32, 34};
 417
 418         if (strlen(str) != 36)
 419                 return AE_BAD_PARAMETER;
 420         for (i = 0; i < 36; i++) {
 421                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 422                         if (str[i] != '-')
 423                                 return AE_BAD_PARAMETER;
 424                 } else if (!isxdigit(str[i]))
 425                         return AE_BAD_PARAMETER;
 426         }
 427         for (i = 0; i < 16; i++) {
 428                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 429                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 430         }
 431         return AE_OK;
 432 }
 433
 434 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 435 {
 436         acpi_status status;
 437         struct acpi_object_list input;
 438         union acpi_object in_params[4];
 439         union acpi_object *out_obj;
 440         u8 uuid[16];
 441         u32 errors;
 442         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 443
 444         if (!context)
 445                 return AE_ERROR;
 446         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 447                 return AE_ERROR;
 448         context->ret.length = ACPI_ALLOCATE_BUFFER;
 449         context->ret.pointer = NULL;
 450
 451         /* Setting up input parameters */
 452         input.count = 4;
 453         input.pointer = in_params;
 454         in_params[0].type               = ACPI_TYPE_BUFFER;
 455         in_params[0].buffer.length      = 16;
 456         in_params[0].buffer.pointer     = uuid;
 457         in_params[1].type               = ACPI_TYPE_INTEGER;
 458         in_params[1].integer.value      = context->rev;
 459         in_params[2].type               = ACPI_TYPE_INTEGER;
 460         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 461         in_params[3].type               = ACPI_TYPE_BUFFER;
 462         in_params[3].buffer.length      = context->cap.length;
 463         in_params[3].buffer.pointer     = context->cap.pointer;
 464
 465         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 466         if (ACPI_FAILURE(status))
 467                 return status;
 468
 469         if (!output.length)
 470                 return AE_NULL_OBJECT;
 471
 472         out_obj = output.pointer;
 473         if (out_obj->type != ACPI_TYPE_BUFFER
 474                 || out_obj->buffer.length != context->cap.length) {
 475                 acpi_print_osc_error(handle, context,
 476                         "_OSC evaluation returned wrong type");
 477                 status = AE_TYPE;
 478                 goto out_kfree;
 479         }
 480         /* Need to ignore the bit0 in result code */
 481         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 482         if (errors) {
 483                 if (errors & OSC_REQUEST_ERROR)
 484                         acpi_print_osc_error(handle, context,
 485                                 "_OSC request failed");
 486                 if (errors & OSC_INVALID_UUID_ERROR)
 487                         acpi_print_osc_error(handle, context,
 488                                 "_OSC invalid UUID");
 489                 if (errors & OSC_INVALID_REVISION_ERROR)
 490                         acpi_print_osc_error(handle, context,
 491                                 "_OSC invalid revision");
 492                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 493                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 494                             & OSC_QUERY_ENABLE)
 495                                 goto out_success;
 496                         status = AE_SUPPORT;
 497                         goto out_kfree;
 498                 }
 499                 status = AE_ERROR;
 500                 goto out_kfree;
 501         }
 502 out_success:
 503         context->ret.length = out_obj->buffer.length;
 504         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 505         if (!context->ret.pointer) {
 506                 status =  AE_NO_MEMORY;
 507                 goto out_kfree;
 508         }
 509         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 510                 context->ret.length);
 511         status =  AE_OK;
 512
 513 out_kfree:
 514         kfree(output.pointer);
 515         if (status != AE_OK)
 516                 context->ret.pointer = NULL;
 517         return status;
 518 }
 519 EXPORT_SYMBOL(acpi_run_osc);
 520
 521 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 522 static void acpi_bus_osc_support(void)
 523 {
 524         u32 capbuf[2];
 525         struct acpi_osc_context context = {
 526                 .uuid_str = sb_uuid_str,
 527                 .rev = 1,
 528                 .cap.length = 8,
 529                 .cap.pointer = capbuf,
 530         };
 531         acpi_handle handle;
 532
 533         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 534         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 535 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 536                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 537         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 538 #endif
 539
 540 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 541         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 542 #endif
 543         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 544                 return;
 545         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 546                 kfree(context.ret.pointer);
 547         /* do we need to check the returned cap? Sounds no */
 548 }
 549
 550 /* --------------------------------------------------------------------------
 551                                 Event Management
 552    -------------------------------------------------------------------------- */
 553
 554 #ifdef CONFIG_ACPI_PROC_EVENT
 555 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 556
 557 LIST_HEAD(acpi_bus_event_list);
 558 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 559
 560 extern int event_is_open;
 561
 562 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 563 {
 564         struct acpi_bus_event *event;
 565         unsigned long flags = 0;
 566
 567         /* drop event on the floor if no one's listening */
 568         if (!event_is_open)
 569                 return 0;
 570
 571         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 572         if (!event)
 573                 return -ENOMEM;
 574
 575         strcpy(event->device_class, device_class);
 576         strcpy(event->bus_id, bus_id);
 577         event->type = type;
 578         event->data = data;
 579
 580         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 581         list_add_tail(&event->node, &acpi_bus_event_list);
 582         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 583
 584         wake_up_interruptible(&acpi_bus_event_queue);
 585
 586         return 0;
 587
 588 }
 589
 590 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 591
 592 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 593 {
 594         if (!device)
 595                 return -EINVAL;
 596         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 597                                              device->pnp.bus_id, type, data);
 598 }
 599
 600 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 601
 602 int acpi_bus_receive_event(struct acpi_bus_event *event)
 603 {
 604         unsigned long flags = 0;
 605         struct acpi_bus_event *entry = NULL;
 606
 607         DECLARE_WAITQUEUE(wait, current);
 608
 609
 610         if (!event)
 611                 return -EINVAL;
 612
 613         if (list_empty(&acpi_bus_event_list)) {
 614
 615                 set_current_state(TASK_INTERRUPTIBLE);
 616                 add_wait_queue(&acpi_bus_event_queue, &wait);
 617
 618                 if (list_empty(&acpi_bus_event_list))
 619                         schedule();
 620
 621                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 622                 set_current_state(TASK_RUNNING);
 623
 624                 if (signal_pending(current))
 625                         return -ERESTARTSYS;
 626         }
 627
 628         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 629         if (!list_empty(&acpi_bus_event_list)) {
 630                 entry = list_entry(acpi_bus_event_list.next,
 631                                    struct acpi_bus_event, node);
 632                 list_del(&entry->node);
 633         }
 634         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 635
 636         if (!entry)
 637                 return -ENODEV;
 638
 639         memcpy(event, entry, sizeof(struct acpi_bus_event));
 640
 641         kfree(entry);
 642
 643         return 0;
 644 }
 645
 646 #endif  /* CONFIG_ACPI_PROC_EVENT */
 647
 648 /* --------------------------------------------------------------------------
 649                              Notification Handling
 650    -------------------------------------------------------------------------- */
 651
 652 static void acpi_bus_check_device(acpi_handle handle)
 653 {
 654         struct acpi_device *device;
 655         acpi_status status;
 656         struct acpi_device_status old_status;
 657
 658         if (acpi_bus_get_device(handle, &device))
 659                 return;
 660         if (!device)
 661                 return;
 662
 663         old_status = device->status;
 664
 665         /*
 666          * Make sure this device's parent is present before we go about
 667          * messing with the device.
 668          */
 669         if (device->parent && !device->parent->status.present) {
 670                 device->status = device->parent->status;
 671                 return;
 672         }
 673
 674         status = acpi_bus_get_status(device);
 675         if (ACPI_FAILURE(status))
 676                 return;
 677
 678         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 679                 return;
 680
 681         /*
 682          * Device Insertion/Removal
 683          */
 684         if ((device->status.present) && !(old_status.present)) {
 685                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 686                 /* TBD: Handle device insertion */
 687         } else if (!(device->status.present) && (old_status.present)) {
 688                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 689                 /* TBD: Handle device removal */
 690         }
 691 }
 692
 693 static void acpi_bus_check_scope(acpi_handle handle)
 694 {
 695         /* Status Change? */
 696         acpi_bus_check_device(handle);
 697
 698         /*
 699          * TBD: Enumerate child devices within this device's scope and
 700          *       run acpi_bus_check_device()'s on them.
 701          */
 702 }
 703
 704 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 705 int register_acpi_bus_notifier(struct notifier_block *nb)
 706 {
 707         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 708 }
 709 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 710
 711 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 712 {
 713         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 714 }
 715 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 716
 717 /**
 718  * acpi_bus_notify
 719  * ---------------
 720  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 721  */
 722 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 723 {
 724         struct acpi_device *device = NULL;
 725         struct acpi_driver *driver;
 726
 727         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 728                           type, handle));
 729
 730         blocking_notifier_call_chain(&acpi_bus_notify_list,
 731                 type, (void *)handle);
 732
 733         switch (type) {
 734
 735         case ACPI_NOTIFY_BUS_CHECK:
 736                 acpi_bus_check_scope(handle);
 737                 /*
 738                  * TBD: We'll need to outsource certain events to non-ACPI
 739                  *      drivers via the device manager (device.c).
 740                  */
 741                 break;
 742
 743         case ACPI_NOTIFY_DEVICE_CHECK:
 744                 acpi_bus_check_device(handle);
 745                 /*
 746                  * TBD: We'll need to outsource certain events to non-ACPI
 747                  *      drivers via the device manager (device.c).
 748                  */
 749                 break;
 750
 751         case ACPI_NOTIFY_DEVICE_WAKE:
 752                 /* TBD */
 753                 break;
 754
 755         case ACPI_NOTIFY_EJECT_REQUEST:
 756                 /* TBD */
 757                 break;
 758
 759         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 760                 /* TBD: Exactly what does 'light' mean? */
 761                 break;
 762
 763         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 764                 /* TBD */
 765                 break;
 766
 767         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 768                 /* TBD */
 769                 break;
 770
 771         case ACPI_NOTIFY_POWER_FAULT:
 772                 /* TBD */
 773                 break;
 774
 775         default:
 776                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 777                                   "Received unknown/unsupported notification [%08x]\n",
 778                                   type));
 779                 break;
 780         }
 781
 782         acpi_bus_get_device(handle, &device);
 783         if (device) {
 784                 driver = device->driver;
 785                 if (driver && driver->ops.notify &&
 786                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 787                         driver->ops.notify(device, type);
 788         }
 789 }
 790
 791 /* --------------------------------------------------------------------------
 792                              Initialization/Cleanup
 793    -------------------------------------------------------------------------- */
 794
 795 static int __init acpi_bus_init_irq(void)
 796 {
 797         acpi_status status = AE_OK;
 798         union acpi_object arg = { ACPI_TYPE_INTEGER };
 799         struct acpi_object_list arg_list = { 1, &arg };
 800         char *message = NULL;
 801
 802
 803         /*
 804          * Let the system know what interrupt model we are using by
 805          * evaluating the \_PIC object, if exists.
 806          */
 807
 808         switch (acpi_irq_model) {
 809         case ACPI_IRQ_MODEL_PIC:
 810                 message = "PIC";
 811                 break;
 812         case ACPI_IRQ_MODEL_IOAPIC:
 813                 message = "IOAPIC";
 814                 break;
 815         case ACPI_IRQ_MODEL_IOSAPIC:
 816                 message = "IOSAPIC";
 817                 break;
 818         case ACPI_IRQ_MODEL_PLATFORM:
 819                 message = "platform specific model";
 820                 break;
 821         default:
 822                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 823                 return -ENODEV;
 824         }
 825
 826         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 827
 828         arg.integer.value = acpi_irq_model;
 829
 830         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 831         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 832                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 833                 return -ENODEV;
 834         }
 835
 836         return 0;
 837 }
 838
 839 u8 acpi_gbl_permanent_mmap;
 840
 841
 842 void __init acpi_early_init(void)
 843 {
 844         acpi_status status = AE_OK;
 845
 846         if (acpi_disabled)
 847                 return;
 848
 849         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 850
 851         /* enable workarounds, unless strict ACPI spec. compliance */
 852         if (!acpi_strict)
 853                 acpi_gbl_enable_interpreter_slack = TRUE;
 854
 855         acpi_gbl_permanent_mmap = 1;
 856
 857         /*
 858          * If the machine falls into the DMI check table,
 859          * DSDT will be copied to memory
 860          */
 861         dmi_check_system(dsdt_dmi_table);
 862
 863         status = acpi_reallocate_root_table();
 864         if (ACPI_FAILURE(status)) {
 865                 printk(KERN_ERR PREFIX
 866                        "Unable to reallocate ACPI tables\n");
 867                 goto error0;
 868         }
 869
 870         status = acpi_initialize_subsystem();
 871         if (ACPI_FAILURE(status)) {
 872                 printk(KERN_ERR PREFIX
 873                        "Unable to initialize the ACPI Interpreter\n");
 874                 goto error0;
 875         }
 876
 877         status = acpi_load_tables();
 878         if (ACPI_FAILURE(status)) {
 879                 printk(KERN_ERR PREFIX
 880                        "Unable to load the System Description Tables\n");
 881                 goto error0;
 882         }
 883
 884 #ifdef CONFIG_X86
 885         if (!acpi_ioapic) {
 886                 /* compatible (0) means level (3) */
 887                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 888                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 889                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 890                 }
 891                 /* Set PIC-mode SCI trigger type */
 892                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 893                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 894         } else {
 895                 /*
 896                  * now that acpi_gbl_FADT is initialized,
 897                  * update it with result from INT_SRC_OVR parsing
 898                  */
 899                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 900         }
 901 #endif
 902
 903         status =
 904             acpi_enable_subsystem(~
 905                                   (ACPI_NO_HARDWARE_INIT |
 906                                    ACPI_NO_ACPI_ENABLE));
 907         if (ACPI_FAILURE(status)) {
 908                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 909                 goto error0;
 910         }
 911
 912         return;
 913
 914       error0:
 915         disable_acpi();
 916         return;
 917 }
 918
 919 static int __init acpi_bus_init(void)
 920 {
 921         int result = 0;
 922         acpi_status status = AE_OK;
 923         extern acpi_status acpi_os_initialize1(void);
 924
 925         acpi_os_initialize1();
 926
 927         status =
 928             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 929         if (ACPI_FAILURE(status)) {
 930                 printk(KERN_ERR PREFIX
 931                        "Unable to start the ACPI Interpreter\n");
 932                 goto error1;
 933         }
 934
 935         /*
 936          * ACPI 2.0 requires the EC driver to be loaded and work before
 937          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 938          * is called).
 939          *
 940          * This is accomplished by looking for the ECDT table, and getting
 941          * the EC parameters out of that.
 942          */
 943         status = acpi_ec_ecdt_probe();
 944         /* Ignore result. Not having an ECDT is not fatal. */
 945
 946         acpi_bus_osc_support();
 947
 948         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 949         if (ACPI_FAILURE(status)) {
 950                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 951                 goto error1;
 952         }
 953
 954         /*
 955          * _PDC control method may load dynamic SSDT tables,
 956          * and we need to install the table handler before that.
 957          */
 958         acpi_sysfs_init();
 959
 960         acpi_early_processor_set_pdc();
 961
 962         /*
 963          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 964          * is necessary to enable it as early as possible.
 965          */
 966         acpi_boot_ec_enable();
 967
 968         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 969
 970         /* Initialize sleep structures */
 971         acpi_sleep_init();
 972
 973         /*
 974          * Get the system interrupt model and evaluate \_PIC.
 975          */
 976         result = acpi_bus_init_irq();
 977         if (result)
 978                 goto error1;
 979
 980         /*
 981          * Register the for all standard device notifications.
 982          */
 983         status =
 984             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 985                                         &acpi_bus_notify, NULL);
 986         if (ACPI_FAILURE(status)) {
 987                 printk(KERN_ERR PREFIX
 988                        "Unable to register for device notifications\n");
 989                 goto error1;
 990         }
 991
 992         /*
 993          * Create the top ACPI proc directory
 994          */
 995         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 996
 997         return 0;
 998
 999         /* Mimic structured exception handling */
1000       error1:
1001         acpi_terminate();
1002         return -ENODEV;
1003 }
1004
1005 struct kobject *acpi_kobj;
1006
1007 static int __init acpi_init(void)
1008 {
1009         int result = 0;
1010
1011
1012         if (acpi_disabled) {
1013                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1014                 return -ENODEV;
1015         }
1016
1017         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1018         if (!acpi_kobj) {
1019                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1020                 acpi_kobj = NULL;
1021         }
1022
1023         init_acpi_device_notify();
1024         result = acpi_bus_init();
1025
1026         if (!result) {
1027                 pci_mmcfg_late_init();
1028                 if (!(pm_flags & PM_APM))
1029                         pm_flags |= PM_ACPI;
1030                 else {
1031                         printk(KERN_INFO PREFIX
1032                                "APM is already active, exiting\n");
1033                         disable_acpi();
1034                         result = -ENODEV;
1035                 }
1036         } else
1037                 disable_acpi();
1038
1039         if (acpi_disabled)
1040                 return result;
1041
1042         acpi_scan_init();
1043         acpi_ec_init();
1044         acpi_debugfs_init();
1045         acpi_sleep_proc_init();
1046         acpi_wakeup_device_init();
1047         return result;
1048 }
1049
1050 subsys_initcall(acpi_init);