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 transistion\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 static int set_copy_dsdt(const struct dmi_system_id *id)
  73 {
  74         printk(KERN_NOTICE "%s detected - "
  75                 "force copy of DSDT to local memory\n", id->ident);
  76         acpi_gbl_copy_dsdt_locally = 1;
  77         return 0;
  78 }
  79
  80 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  81         /*
  82          * Insyde BIOS on some TOSHIBA machines corrupt the DSDT.
  83          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  84          */
  85         {
  86          .callback = set_copy_dsdt,
  87          .ident = "TOSHIBA Satellite A505",
  88          .matches = {
  89                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  90                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite A505"),
  91                 },
  92         },
  93         {
  94          .callback = set_copy_dsdt,
  95          .ident = "TOSHIBA Satellite L505D",
  96          .matches = {
  97                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  98                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L505D"),
  99                 },
 100         }
 101 };
 102
 103 /* --------------------------------------------------------------------------
 104                                 Device Management
 105    -------------------------------------------------------------------------- */
 106
 107 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 108 {
 109         acpi_status status = AE_OK;
 110
 111
 112         if (!device)
 113                 return -EINVAL;
 114
 115         /* TBD: Support fixed-feature devices */
 116
 117         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 118         if (ACPI_FAILURE(status) || !*device) {
 119                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 120                                   handle));
 121                 return -ENODEV;
 122         }
 123
 124         return 0;
 125 }
 126
 127 EXPORT_SYMBOL(acpi_bus_get_device);
 128
 129 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 130                                        unsigned long long *sta)
 131 {
 132         acpi_status status;
 133
 134         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 135         if (ACPI_SUCCESS(status))
 136                 return AE_OK;
 137
 138         if (status == AE_NOT_FOUND) {
 139                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 140                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 141                 return AE_OK;
 142         }
 143         return status;
 144 }
 145
 146 int acpi_bus_get_status(struct acpi_device *device)
 147 {
 148         acpi_status status;
 149         unsigned long long sta;
 150
 151         status = acpi_bus_get_status_handle(device->handle, &sta);
 152         if (ACPI_FAILURE(status))
 153                 return -ENODEV;
 154
 155         STRUCT_TO_INT(device->status) = (int) sta;
 156
 157         if (device->status.functional && !device->status.present) {
 158                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 159                        "functional but not present;\n",
 160                         device->pnp.bus_id,
 161                         (u32) STRUCT_TO_INT(device->status)));
 162         }
 163
 164         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 165                           device->pnp.bus_id,
 166                           (u32) STRUCT_TO_INT(device->status)));
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(acpi_bus_get_status);
 170
 171 void acpi_bus_private_data_handler(acpi_handle handle,
 172                                    void *context)
 173 {
 174         return;
 175 }
 176 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 177
 178 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 179 {
 180         acpi_status status = AE_OK;
 181
 182         if (!*data)
 183                 return -EINVAL;
 184
 185         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 186         if (ACPI_FAILURE(status) || !*data) {
 187                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 188                                 handle));
 189                 return -ENODEV;
 190         }
 191
 192         return 0;
 193 }
 194 EXPORT_SYMBOL(acpi_bus_get_private_data);
 195
 196 /* --------------------------------------------------------------------------
 197                                  Power Management
 198    -------------------------------------------------------------------------- */
 199
 200 int acpi_bus_get_power(acpi_handle handle, int *state)
 201 {
 202         int result = 0;
 203         acpi_status status = 0;
 204         struct acpi_device *device = NULL;
 205         unsigned long long psc = 0;
 206
 207
 208         result = acpi_bus_get_device(handle, &device);
 209         if (result)
 210                 return result;
 211
 212         *state = ACPI_STATE_UNKNOWN;
 213
 214         if (!device->flags.power_manageable) {
 215                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 216                 if (device->parent)
 217                         *state = device->parent->power.state;
 218                 else
 219                         *state = ACPI_STATE_D0;
 220         } else {
 221                 /*
 222                  * Get the device's power state either directly (via _PSC) or
 223                  * indirectly (via power resources).
 224                  */
 225                 if (device->power.flags.power_resources) {
 226                         result = acpi_power_get_inferred_state(device);
 227                         if (result)
 228                                 return result;
 229                 } else if (device->power.flags.explicit_get) {
 230                         status = acpi_evaluate_integer(device->handle, "_PSC",
 231                                                        NULL, &psc);
 232                         if (ACPI_FAILURE(status))
 233                                 return -ENODEV;
 234                         device->power.state = (int)psc;
 235                 }
 236
 237                 *state = device->power.state;
 238         }
 239
 240         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 241                           device->pnp.bus_id, device->power.state));
 242
 243         return 0;
 244 }
 245
 246 EXPORT_SYMBOL(acpi_bus_get_power);
 247
 248 int acpi_bus_set_power(acpi_handle handle, int state)
 249 {
 250         int result = 0;
 251         acpi_status status = AE_OK;
 252         struct acpi_device *device = NULL;
 253         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 254
 255
 256         result = acpi_bus_get_device(handle, &device);
 257         if (result)
 258                 return result;
 259
 260         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 261                 return -EINVAL;
 262
 263         /* Make sure this is a valid target state */
 264
 265         if (!device->flags.power_manageable) {
 266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 267                                 kobject_name(&device->dev.kobj)));
 268                 return -ENODEV;
 269         }
 270         /*
 271          * Get device's current power state
 272          */
 273         if (!acpi_power_nocheck) {
 274                 /*
 275                  * Maybe the incorrect power state is returned on the bogus
 276                  * bios, which is different with the real power state.
 277                  * For example: the bios returns D0 state and the real power
 278                  * state is D3. OS expects to set the device to D0 state. In
 279                  * such case if OS uses the power state returned by the BIOS,
 280                  * the device can't be transisted to the correct power state.
 281                  * So if the acpi_power_nocheck is set, it is unnecessary to
 282                  * get the power state by calling acpi_bus_get_power.
 283                  */
 284                 acpi_bus_get_power(device->handle, &device->power.state);
 285         }
 286         if ((state == device->power.state) && !device->flags.force_power_state) {
 287                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 288                                   state));
 289                 return 0;
 290         }
 291
 292         if (!device->power.states[state].flags.valid) {
 293                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 294                 return -ENODEV;
 295         }
 296         if (device->parent && (state < device->parent->power.state)) {
 297                 printk(KERN_WARNING PREFIX
 298                               "Cannot set device to a higher-powered"
 299                               " state than parent\n");
 300                 return -ENODEV;
 301         }
 302
 303         /*
 304          * Transition Power
 305          * ----------------
 306          * On transitions to a high-powered state we first apply power (via
 307          * power resources) then evalute _PSx.  Conversly for transitions to
 308          * a lower-powered state.
 309          */
 310         if (state < device->power.state) {
 311                 if (device->power.flags.power_resources) {
 312                         result = acpi_power_transition(device, state);
 313                         if (result)
 314                                 goto end;
 315                 }
 316                 if (device->power.states[state].flags.explicit_set) {
 317                         status = acpi_evaluate_object(device->handle,
 318                                                       object_name, NULL, NULL);
 319                         if (ACPI_FAILURE(status)) {
 320                                 result = -ENODEV;
 321                                 goto end;
 322                         }
 323                 }
 324         } else {
 325                 if (device->power.states[state].flags.explicit_set) {
 326                         status = acpi_evaluate_object(device->handle,
 327                                                       object_name, NULL, NULL);
 328                         if (ACPI_FAILURE(status)) {
 329                                 result = -ENODEV;
 330                                 goto end;
 331                         }
 332                 }
 333                 if (device->power.flags.power_resources) {
 334                         result = acpi_power_transition(device, state);
 335                         if (result)
 336                                 goto end;
 337                 }
 338         }
 339
 340       end:
 341         if (result)
 342                 printk(KERN_WARNING PREFIX
 343                               "Device [%s] failed to transition to D%d\n",
 344                               device->pnp.bus_id, state);
 345         else {
 346                 device->power.state = state;
 347                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 348                                   "Device [%s] transitioned to D%d\n",
 349                                   device->pnp.bus_id, state));
 350         }
 351
 352         return result;
 353 }
 354
 355 EXPORT_SYMBOL(acpi_bus_set_power);
 356
 357 bool acpi_bus_power_manageable(acpi_handle handle)
 358 {
 359         struct acpi_device *device;
 360         int result;
 361
 362         result = acpi_bus_get_device(handle, &device);
 363         return result ? false : device->flags.power_manageable;
 364 }
 365
 366 EXPORT_SYMBOL(acpi_bus_power_manageable);
 367
 368 bool acpi_bus_can_wakeup(acpi_handle handle)
 369 {
 370         struct acpi_device *device;
 371         int result;
 372
 373         result = acpi_bus_get_device(handle, &device);
 374         return result ? false : device->wakeup.flags.valid;
 375 }
 376
 377 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 378
 379 static void acpi_print_osc_error(acpi_handle handle,
 380         struct acpi_osc_context *context, char *error)
 381 {
 382         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 383         int i;
 384
 385         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 386                 printk(KERN_DEBUG "%s\n", error);
 387         else {
 388                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 389                 kfree(buffer.pointer);
 390         }
 391         printk(KERN_DEBUG"_OSC request data:");
 392         for (i = 0; i < context->cap.length; i += sizeof(u32))
 393                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 394         printk("\n");
 395 }
 396
 397 static u8 hex_val(unsigned char c)
 398 {
 399         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
 400 }
 401
 402 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 403 {
 404         int i;
 405         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 406                 24, 26, 28, 30, 32, 34};
 407
 408         if (strlen(str) != 36)
 409                 return AE_BAD_PARAMETER;
 410         for (i = 0; i < 36; i++) {
 411                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 412                         if (str[i] != '-')
 413                                 return AE_BAD_PARAMETER;
 414                 } else if (!isxdigit(str[i]))
 415                         return AE_BAD_PARAMETER;
 416         }
 417         for (i = 0; i < 16; i++) {
 418                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
 419                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
 420         }
 421         return AE_OK;
 422 }
 423
 424 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 425 {
 426         acpi_status status;
 427         struct acpi_object_list input;
 428         union acpi_object in_params[4];
 429         union acpi_object *out_obj;
 430         u8 uuid[16];
 431         u32 errors;
 432         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 433
 434         if (!context)
 435                 return AE_ERROR;
 436         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 437                 return AE_ERROR;
 438         context->ret.length = ACPI_ALLOCATE_BUFFER;
 439         context->ret.pointer = NULL;
 440
 441         /* Setting up input parameters */
 442         input.count = 4;
 443         input.pointer = in_params;
 444         in_params[0].type               = ACPI_TYPE_BUFFER;
 445         in_params[0].buffer.length      = 16;
 446         in_params[0].buffer.pointer     = uuid;
 447         in_params[1].type               = ACPI_TYPE_INTEGER;
 448         in_params[1].integer.value      = context->rev;
 449         in_params[2].type               = ACPI_TYPE_INTEGER;
 450         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 451         in_params[3].type               = ACPI_TYPE_BUFFER;
 452         in_params[3].buffer.length      = context->cap.length;
 453         in_params[3].buffer.pointer     = context->cap.pointer;
 454
 455         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 456         if (ACPI_FAILURE(status))
 457                 return status;
 458
 459         if (!output.length)
 460                 return AE_NULL_OBJECT;
 461
 462         out_obj = output.pointer;
 463         if (out_obj->type != ACPI_TYPE_BUFFER
 464                 || out_obj->buffer.length != context->cap.length) {
 465                 acpi_print_osc_error(handle, context,
 466                         "_OSC evaluation returned wrong type");
 467                 status = AE_TYPE;
 468                 goto out_kfree;
 469         }
 470         /* Need to ignore the bit0 in result code */
 471         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 472         if (errors) {
 473                 if (errors & OSC_REQUEST_ERROR)
 474                         acpi_print_osc_error(handle, context,
 475                                 "_OSC request failed");
 476                 if (errors & OSC_INVALID_UUID_ERROR)
 477                         acpi_print_osc_error(handle, context,
 478                                 "_OSC invalid UUID");
 479                 if (errors & OSC_INVALID_REVISION_ERROR)
 480                         acpi_print_osc_error(handle, context,
 481                                 "_OSC invalid revision");
 482                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 483                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 484                             & OSC_QUERY_ENABLE)
 485                                 goto out_success;
 486                         status = AE_SUPPORT;
 487                         goto out_kfree;
 488                 }
 489                 status = AE_ERROR;
 490                 goto out_kfree;
 491         }
 492 out_success:
 493         context->ret.length = out_obj->buffer.length;
 494         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 495         if (!context->ret.pointer) {
 496                 status =  AE_NO_MEMORY;
 497                 goto out_kfree;
 498         }
 499         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 500                 context->ret.length);
 501         status =  AE_OK;
 502
 503 out_kfree:
 504         kfree(output.pointer);
 505         if (status != AE_OK)
 506                 context->ret.pointer = NULL;
 507         return status;
 508 }
 509 EXPORT_SYMBOL(acpi_run_osc);
 510
 511 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 512 static void acpi_bus_osc_support(void)
 513 {
 514         u32 capbuf[2];
 515         struct acpi_osc_context context = {
 516                 .uuid_str = sb_uuid_str,
 517                 .rev = 1,
 518                 .cap.length = 8,
 519                 .cap.pointer = capbuf,
 520         };
 521         acpi_handle handle;
 522
 523         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 524         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 525 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 526                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 527         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 528 #endif
 529
 530 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 531         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 532 #endif
 533         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 534                 return;
 535         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 536                 kfree(context.ret.pointer);
 537         /* do we need to check the returned cap? Sounds no */
 538 }
 539
 540 /* --------------------------------------------------------------------------
 541                                 Event Management
 542    -------------------------------------------------------------------------- */
 543
 544 #ifdef CONFIG_ACPI_PROC_EVENT
 545 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 546
 547 LIST_HEAD(acpi_bus_event_list);
 548 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 549
 550 extern int event_is_open;
 551
 552 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 553 {
 554         struct acpi_bus_event *event;
 555         unsigned long flags = 0;
 556
 557         /* drop event on the floor if no one's listening */
 558         if (!event_is_open)
 559                 return 0;
 560
 561         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 562         if (!event)
 563                 return -ENOMEM;
 564
 565         strcpy(event->device_class, device_class);
 566         strcpy(event->bus_id, bus_id);
 567         event->type = type;
 568         event->data = data;
 569
 570         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 571         list_add_tail(&event->node, &acpi_bus_event_list);
 572         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 573
 574         wake_up_interruptible(&acpi_bus_event_queue);
 575
 576         return 0;
 577
 578 }
 579
 580 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 581
 582 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 583 {
 584         if (!device)
 585                 return -EINVAL;
 586         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 587                                              device->pnp.bus_id, type, data);
 588 }
 589
 590 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 591
 592 int acpi_bus_receive_event(struct acpi_bus_event *event)
 593 {
 594         unsigned long flags = 0;
 595         struct acpi_bus_event *entry = NULL;
 596
 597         DECLARE_WAITQUEUE(wait, current);
 598
 599
 600         if (!event)
 601                 return -EINVAL;
 602
 603         if (list_empty(&acpi_bus_event_list)) {
 604
 605                 set_current_state(TASK_INTERRUPTIBLE);
 606                 add_wait_queue(&acpi_bus_event_queue, &wait);
 607
 608                 if (list_empty(&acpi_bus_event_list))
 609                         schedule();
 610
 611                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 612                 set_current_state(TASK_RUNNING);
 613
 614                 if (signal_pending(current))
 615                         return -ERESTARTSYS;
 616         }
 617
 618         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 619         if (!list_empty(&acpi_bus_event_list)) {
 620                 entry = list_entry(acpi_bus_event_list.next,
 621                                    struct acpi_bus_event, node);
 622                 list_del(&entry->node);
 623         }
 624         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 625
 626         if (!entry)
 627                 return -ENODEV;
 628
 629         memcpy(event, entry, sizeof(struct acpi_bus_event));
 630
 631         kfree(entry);
 632
 633         return 0;
 634 }
 635
 636 #endif  /* CONFIG_ACPI_PROC_EVENT */
 637
 638 /* --------------------------------------------------------------------------
 639                              Notification Handling
 640    -------------------------------------------------------------------------- */
 641
 642 static void acpi_bus_check_device(acpi_handle handle)
 643 {
 644         struct acpi_device *device;
 645         acpi_status status;
 646         struct acpi_device_status old_status;
 647
 648         if (acpi_bus_get_device(handle, &device))
 649                 return;
 650         if (!device)
 651                 return;
 652
 653         old_status = device->status;
 654
 655         /*
 656          * Make sure this device's parent is present before we go about
 657          * messing with the device.
 658          */
 659         if (device->parent && !device->parent->status.present) {
 660                 device->status = device->parent->status;
 661                 return;
 662         }
 663
 664         status = acpi_bus_get_status(device);
 665         if (ACPI_FAILURE(status))
 666                 return;
 667
 668         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 669                 return;
 670
 671         /*
 672          * Device Insertion/Removal
 673          */
 674         if ((device->status.present) && !(old_status.present)) {
 675                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 676                 /* TBD: Handle device insertion */
 677         } else if (!(device->status.present) && (old_status.present)) {
 678                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 679                 /* TBD: Handle device removal */
 680         }
 681 }
 682
 683 static void acpi_bus_check_scope(acpi_handle handle)
 684 {
 685         /* Status Change? */
 686         acpi_bus_check_device(handle);
 687
 688         /*
 689          * TBD: Enumerate child devices within this device's scope and
 690          *       run acpi_bus_check_device()'s on them.
 691          */
 692 }
 693
 694 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 695 int register_acpi_bus_notifier(struct notifier_block *nb)
 696 {
 697         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 698 }
 699 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 700
 701 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 702 {
 703         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 704 }
 705 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 706
 707 /**
 708  * acpi_bus_notify
 709  * ---------------
 710  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 711  */
 712 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 713 {
 714         struct acpi_device *device = NULL;
 715         struct acpi_driver *driver;
 716
 717         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 718                           type, handle));
 719
 720         blocking_notifier_call_chain(&acpi_bus_notify_list,
 721                 type, (void *)handle);
 722
 723         switch (type) {
 724
 725         case ACPI_NOTIFY_BUS_CHECK:
 726                 acpi_bus_check_scope(handle);
 727                 /*
 728                  * TBD: We'll need to outsource certain events to non-ACPI
 729                  *      drivers via the device manager (device.c).
 730                  */
 731                 break;
 732
 733         case ACPI_NOTIFY_DEVICE_CHECK:
 734                 acpi_bus_check_device(handle);
 735                 /*
 736                  * TBD: We'll need to outsource certain events to non-ACPI
 737                  *      drivers via the device manager (device.c).
 738                  */
 739                 break;
 740
 741         case ACPI_NOTIFY_DEVICE_WAKE:
 742                 /* TBD */
 743                 break;
 744
 745         case ACPI_NOTIFY_EJECT_REQUEST:
 746                 /* TBD */
 747                 break;
 748
 749         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 750                 /* TBD: Exactly what does 'light' mean? */
 751                 break;
 752
 753         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 754                 /* TBD */
 755                 break;
 756
 757         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 758                 /* TBD */
 759                 break;
 760
 761         case ACPI_NOTIFY_POWER_FAULT:
 762                 /* TBD */
 763                 break;
 764
 765         default:
 766                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 767                                   "Received unknown/unsupported notification [%08x]\n",
 768                                   type));
 769                 break;
 770         }
 771
 772         acpi_bus_get_device(handle, &device);
 773         if (device) {
 774                 driver = device->driver;
 775                 if (driver && driver->ops.notify &&
 776                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 777                         driver->ops.notify(device, type);
 778         }
 779 }
 780
 781 /* --------------------------------------------------------------------------
 782                              Initialization/Cleanup
 783    -------------------------------------------------------------------------- */
 784
 785 static int __init acpi_bus_init_irq(void)
 786 {
 787         acpi_status status = AE_OK;
 788         union acpi_object arg = { ACPI_TYPE_INTEGER };
 789         struct acpi_object_list arg_list = { 1, &arg };
 790         char *message = NULL;
 791
 792
 793         /*
 794          * Let the system know what interrupt model we are using by
 795          * evaluating the \_PIC object, if exists.
 796          */
 797
 798         switch (acpi_irq_model) {
 799         case ACPI_IRQ_MODEL_PIC:
 800                 message = "PIC";
 801                 break;
 802         case ACPI_IRQ_MODEL_IOAPIC:
 803                 message = "IOAPIC";
 804                 break;
 805         case ACPI_IRQ_MODEL_IOSAPIC:
 806                 message = "IOSAPIC";
 807                 break;
 808         case ACPI_IRQ_MODEL_PLATFORM:
 809                 message = "platform specific model";
 810                 break;
 811         default:
 812                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 813                 return -ENODEV;
 814         }
 815
 816         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 817
 818         arg.integer.value = acpi_irq_model;
 819
 820         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 821         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 822                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 823                 return -ENODEV;
 824         }
 825
 826         return 0;
 827 }
 828
 829 u8 acpi_gbl_permanent_mmap;
 830
 831
 832 void __init acpi_early_init(void)
 833 {
 834         acpi_status status = AE_OK;
 835
 836         if (acpi_disabled)
 837                 return;
 838
 839         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 840
 841         /* enable workarounds, unless strict ACPI spec. compliance */
 842         if (!acpi_strict)
 843                 acpi_gbl_enable_interpreter_slack = TRUE;
 844
 845         acpi_gbl_permanent_mmap = 1;
 846
 847         /*
 848          * If the machine falls into the DMI check table,
 849          * DSDT will be copied to memory
 850          */
 851         dmi_check_system(dsdt_dmi_table);
 852
 853         status = acpi_reallocate_root_table();
 854         if (ACPI_FAILURE(status)) {
 855                 printk(KERN_ERR PREFIX
 856                        "Unable to reallocate ACPI tables\n");
 857                 goto error0;
 858         }
 859
 860         status = acpi_initialize_subsystem();
 861         if (ACPI_FAILURE(status)) {
 862                 printk(KERN_ERR PREFIX
 863                        "Unable to initialize the ACPI Interpreter\n");
 864                 goto error0;
 865         }
 866
 867         status = acpi_load_tables();
 868         if (ACPI_FAILURE(status)) {
 869                 printk(KERN_ERR PREFIX
 870                        "Unable to load the System Description Tables\n");
 871                 goto error0;
 872         }
 873
 874 #ifdef CONFIG_X86
 875         if (!acpi_ioapic) {
 876                 /* compatible (0) means level (3) */
 877                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 878                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 879                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 880                 }
 881                 /* Set PIC-mode SCI trigger type */
 882                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 883                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 884         } else {
 885                 /*
 886                  * now that acpi_gbl_FADT is initialized,
 887                  * update it with result from INT_SRC_OVR parsing
 888                  */
 889                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 890         }
 891 #endif
 892
 893         status =
 894             acpi_enable_subsystem(~
 895                                   (ACPI_NO_HARDWARE_INIT |
 896                                    ACPI_NO_ACPI_ENABLE));
 897         if (ACPI_FAILURE(status)) {
 898                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 899                 goto error0;
 900         }
 901
 902         return;
 903
 904       error0:
 905         disable_acpi();
 906         return;
 907 }
 908
 909 static int __init acpi_bus_init(void)
 910 {
 911         int result = 0;
 912         acpi_status status = AE_OK;
 913         extern acpi_status acpi_os_initialize1(void);
 914
 915         acpi_os_initialize1();
 916
 917         status =
 918             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 919         if (ACPI_FAILURE(status)) {
 920                 printk(KERN_ERR PREFIX
 921                        "Unable to start the ACPI Interpreter\n");
 922                 goto error1;
 923         }
 924
 925         /*
 926          * ACPI 2.0 requires the EC driver to be loaded and work before
 927          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 928          * is called).
 929          *
 930          * This is accomplished by looking for the ECDT table, and getting
 931          * the EC parameters out of that.
 932          */
 933         status = acpi_ec_ecdt_probe();
 934         /* Ignore result. Not having an ECDT is not fatal. */
 935
 936         acpi_bus_osc_support();
 937
 938         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 939         if (ACPI_FAILURE(status)) {
 940                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 941                 goto error1;
 942         }
 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 transistion.
1029          */
1030         dmi_check_system(power_nocheck_dmi_table);
1031
1032         acpi_scan_init();
1033         acpi_ec_init();
1034         acpi_power_init();
1035         acpi_system_init();
1036         acpi_debug_init();
1037         acpi_sleep_proc_init();
1038         acpi_wakeup_device_init();
1039         return result;
1040 }
1041
1042 subsys_initcall(acpi_init);