release/src-rt-6.x.4708/linux/linux-2.6.36/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          .callback = set_copy_dsdt,
  84          .ident = "TOSHIBA Satellite",
  85          .matches = {
  86                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  87                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  88                 },
  89         },
  90         {}
  91 };
  92 #else
  93 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  94         {}
  95 };
  96 #endif
  97
  98 /* --------------------------------------------------------------------------
  99                                 Device Management
 100    -------------------------------------------------------------------------- */
 101
 102 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 103 {
 104         acpi_status status = AE_OK;
 105
 106
 107         if (!device)
 108                 return -EINVAL;
 109
 110         /* TBD: Support fixed-feature devices */
 111
 112         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 113         if (ACPI_FAILURE(status) || !*device) {
 114                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 115                                   handle));
 116                 return -ENODEV;
 117         }
 118
 119         return 0;
 120 }
 121
 122 EXPORT_SYMBOL(acpi_bus_get_device);
 123
 124 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 125                                        unsigned long long *sta)
 126 {
 127         acpi_status status;
 128
 129         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 130         if (ACPI_SUCCESS(status))
 131                 return AE_OK;
 132
 133         if (status == AE_NOT_FOUND) {
 134                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 135                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 136                 return AE_OK;
 137         }
 138         return status;
 139 }
 140
 141 int acpi_bus_get_status(struct acpi_device *device)
 142 {
 143         acpi_status status;
 144         unsigned long long sta;
 145
 146         status = acpi_bus_get_status_handle(device->handle, &sta);
 147         if (ACPI_FAILURE(status))
 148                 return -ENODEV;
 149
 150         STRUCT_TO_INT(device->status) = (int) sta;
 151
 152         if (device->status.functional && !device->status.present) {
 153                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 154                        "functional but not present;\n",
 155                         device->pnp.bus_id,
 156                         (u32) STRUCT_TO_INT(device->status)));
 157         }
 158
 159         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 160                           device->pnp.bus_id,
 161                           (u32) STRUCT_TO_INT(device->status)));
 162         return 0;
 163 }
 164 EXPORT_SYMBOL(acpi_bus_get_status);
 165
 166 void acpi_bus_private_data_handler(acpi_handle handle,
 167                                    void *context)
 168 {
 169         return;
 170 }
 171 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 172
 173 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 174 {
 175         acpi_status status = AE_OK;
 176
 177         if (!*data)
 178                 return -EINVAL;
 179
 180         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 181         if (ACPI_FAILURE(status) || !*data) {
 182                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 183                                 handle));
 184                 return -ENODEV;
 185         }
 186
 187         return 0;
 188 }
 189 EXPORT_SYMBOL(acpi_bus_get_private_data);
 190
 191 /* --------------------------------------------------------------------------
 192                                  Power Management
 193    -------------------------------------------------------------------------- */
 194
 195 int acpi_bus_get_power(acpi_handle handle, int *state)
 196 {
 197         int result = 0;
 198         acpi_status status = 0;
 199         struct acpi_device *device = NULL;
 200         unsigned long long psc = 0;
 201
 202
 203         result = acpi_bus_get_device(handle, &device);
 204         if (result)
 205                 return result;
 206
 207         *state = ACPI_STATE_UNKNOWN;
 208
 209         if (!device->flags.power_manageable) {
 210                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 211                 if (device->parent)
 212                         *state = device->parent->power.state;
 213                 else
 214                         *state = ACPI_STATE_D0;
 215         } else {
 216                 /*
 217                  * Get the device's power state either directly (via _PSC) or
 218                  * indirectly (via power resources).
 219                  */
 220                 if (device->power.flags.power_resources) {
 221                         result = acpi_power_get_inferred_state(device);
 222                         if (result)
 223                                 return result;
 224                 } else if (device->power.flags.explicit_get) {
 225                         status = acpi_evaluate_integer(device->handle, "_PSC",
 226                                                        NULL, &psc);
 227                         if (ACPI_FAILURE(status))
 228                                 return -ENODEV;
 229                         device->power.state = (int)psc;
 230                 }
 231
 232                 *state = device->power.state;
 233         }
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 236                           device->pnp.bus_id, device->power.state));
 237
 238         return 0;
 239 }
 240
 241 EXPORT_SYMBOL(acpi_bus_get_power);
 242
 243 int acpi_bus_set_power(acpi_handle handle, int state)
 244 {
 245         int result = 0;
 246         acpi_status status = AE_OK;
 247         struct acpi_device *device = NULL;
 248         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 249
 250
 251         result = acpi_bus_get_device(handle, &device);
 252         if (result)
 253                 return result;
 254
 255         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 256                 return -EINVAL;
 257
 258         /* Make sure this is a valid target state */
 259
 260         if (!device->flags.power_manageable) {
 261                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 262                                 kobject_name(&device->dev.kobj)));
 263                 return -ENODEV;
 264         }
 265         /*
 266          * Get device's current power state
 267          */
 268         if (!acpi_power_nocheck) {
 269                 /*
 270                  * Maybe the incorrect power state is returned on the bogus
 271                  * bios, which is different with the real power state.
 272                  * For example: the bios returns D0 state and the real power
 273                  * state is D3. OS expects to set the device to D0 state. In
 274                  * such case if OS uses the power state returned by the BIOS,
 275                  * the device can't be transisted to the correct power state.
 276                  * So if the acpi_power_nocheck is set, it is unnecessary to
 277                  * get the power state by calling acpi_bus_get_power.
 278                  */
 279                 acpi_bus_get_power(device->handle, &device->power.state);
 280         }
 281         if ((state == device->power.state) && !device->flags.force_power_state) {
 282                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 283                                   state));
 284                 return 0;
 285         }
 286
 287         if (!device->power.states[state].flags.valid) {
 288                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 289                 return -ENODEV;
 290         }
 291         if (device->parent && (state < device->parent->power.state)) {
 292                 printk(KERN_WARNING PREFIX
 293                               "Cannot set device to a higher-powered"
 294                               " state than parent\n");
 295                 return -ENODEV;
 296         }
 297
 298         /*
 299          * Transition Power
 300          * ----------------
 301          * On transitions to a high-powered state we first apply power (via
 302          * power resources) then evalute _PSx.  Conversly for transitions to
 303          * a lower-powered state.
 304          */
 305         if (state < device->power.state) {
 306                 if (device->power.flags.power_resources) {
 307                         result = acpi_power_transition(device, state);
 308                         if (result)
 309                                 goto end;
 310                 }
 311                 if (device->power.states[state].flags.explicit_set) {
 312                         status = acpi_evaluate_object(device->handle,
 313                                                       object_name, NULL, NULL);
 314                         if (ACPI_FAILURE(status)) {
 315                                 result = -ENODEV;
 316                                 goto end;
 317                         }
 318                 }
 319         } else {
 320                 if (device->power.states[state].flags.explicit_set) {
 321                         status = acpi_evaluate_object(device->handle,
 322                                                       object_name, NULL, NULL);
 323                         if (ACPI_FAILURE(status)) {
 324                                 result = -ENODEV;
 325                                 goto end;
 326                         }
 327                 }
 328                 if (device->power.flags.power_resources) {
 329                         result = acpi_power_transition(device, state);
 330                         if (result)
 331                                 goto end;
 332                 }
 333         }
 334
 335       end:
 336         if (result)
 337                 printk(KERN_WARNING PREFIX
 338                               "Device [%s] failed to transition to D%d\n",
 339                               device->pnp.bus_id, state);
 340         else {
 341                 device->power.state = state;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 343                                   "Device [%s] transitioned to D%d\n",
 344                                   device->pnp.bus_id, state));
 345         }
 346
 347         return result;
 348 }
 349
 350 EXPORT_SYMBOL(acpi_bus_set_power);
 351
 352 bool acpi_bus_power_manageable(acpi_handle handle)
 353 {
 354         struct acpi_device *device;
 355         int result;
 356
 357         result = acpi_bus_get_device(handle, &device);
 358         return result ? false : device->flags.power_manageable;
 359 }
 360
 361 EXPORT_SYMBOL(acpi_bus_power_manageable);
 362
 363 bool acpi_bus_can_wakeup(acpi_handle handle)
 364 {
 365         struct acpi_device *device;
 366         int result;
 367
 368         result = acpi_bus_get_device(handle, &device);
 369         return result ? false : device->wakeup.flags.valid;
 370 }
 371
 372 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 373
 374 static void acpi_print_osc_error(acpi_handle handle,
 375         struct acpi_osc_context *context, char *error)
 376 {
 377         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 378         int i;
 379
 380         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 381                 printk(KERN_DEBUG "%s\n", error);
 382         else {
 383                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 384                 kfree(buffer.pointer);
 385         }
 386         printk(KERN_DEBUG"_OSC request data:");
 387         for (i = 0; i < context->cap.length; i += sizeof(u32))
 388                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 389         printk("\n");
 390 }
 391
 392 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 393 {
 394         int i;
 395         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 396                 24, 26, 28, 30, 32, 34};
 397
 398         if (strlen(str) != 36)
 399                 return AE_BAD_PARAMETER;
 400         for (i = 0; i < 36; i++) {
 401                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 402                         if (str[i] != '-')
 403                                 return AE_BAD_PARAMETER;
 404                 } else if (!isxdigit(str[i]))
 405                         return AE_BAD_PARAMETER;
 406         }
 407         for (i = 0; i < 16; i++) {
 408                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 409                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 410         }
 411         return AE_OK;
 412 }
 413
 414 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 415 {
 416         acpi_status status;
 417         struct acpi_object_list input;
 418         union acpi_object in_params[4];
 419         union acpi_object *out_obj;
 420         u8 uuid[16];
 421         u32 errors;
 422         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 423
 424         if (!context)
 425                 return AE_ERROR;
 426         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 427                 return AE_ERROR;
 428         context->ret.length = ACPI_ALLOCATE_BUFFER;
 429         context->ret.pointer = NULL;
 430
 431         /* Setting up input parameters */
 432         input.count = 4;
 433         input.pointer = in_params;
 434         in_params[0].type               = ACPI_TYPE_BUFFER;
 435         in_params[0].buffer.length      = 16;
 436         in_params[0].buffer.pointer     = uuid;
 437         in_params[1].type               = ACPI_TYPE_INTEGER;
 438         in_params[1].integer.value      = context->rev;
 439         in_params[2].type               = ACPI_TYPE_INTEGER;
 440         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 441         in_params[3].type               = ACPI_TYPE_BUFFER;
 442         in_params[3].buffer.length      = context->cap.length;
 443         in_params[3].buffer.pointer     = context->cap.pointer;
 444
 445         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 446         if (ACPI_FAILURE(status))
 447                 return status;
 448
 449         if (!output.length)
 450                 return AE_NULL_OBJECT;
 451
 452         out_obj = output.pointer;
 453         if (out_obj->type != ACPI_TYPE_BUFFER
 454                 || out_obj->buffer.length != context->cap.length) {
 455                 acpi_print_osc_error(handle, context,
 456                         "_OSC evaluation returned wrong type");
 457                 status = AE_TYPE;
 458                 goto out_kfree;
 459         }
 460         /* Need to ignore the bit0 in result code */
 461         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 462         if (errors) {
 463                 if (errors & OSC_REQUEST_ERROR)
 464                         acpi_print_osc_error(handle, context,
 465                                 "_OSC request failed");
 466                 if (errors & OSC_INVALID_UUID_ERROR)
 467                         acpi_print_osc_error(handle, context,
 468                                 "_OSC invalid UUID");
 469                 if (errors & OSC_INVALID_REVISION_ERROR)
 470                         acpi_print_osc_error(handle, context,
 471                                 "_OSC invalid revision");
 472                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 473                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 474                             & OSC_QUERY_ENABLE)
 475                                 goto out_success;
 476                         status = AE_SUPPORT;
 477                         goto out_kfree;
 478                 }
 479                 status = AE_ERROR;
 480                 goto out_kfree;
 481         }
 482 out_success:
 483         context->ret.length = out_obj->buffer.length;
 484         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 485         if (!context->ret.pointer) {
 486                 status =  AE_NO_MEMORY;
 487                 goto out_kfree;
 488         }
 489         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 490                 context->ret.length);
 491         status =  AE_OK;
 492
 493 out_kfree:
 494         kfree(output.pointer);
 495         if (status != AE_OK)
 496                 context->ret.pointer = NULL;
 497         return status;
 498 }
 499 EXPORT_SYMBOL(acpi_run_osc);
 500
 501 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 502 static void acpi_bus_osc_support(void)
 503 {
 504         u32 capbuf[2];
 505         struct acpi_osc_context context = {
 506                 .uuid_str = sb_uuid_str,
 507                 .rev = 1,
 508                 .cap.length = 8,
 509                 .cap.pointer = capbuf,
 510         };
 511         acpi_handle handle;
 512
 513         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 514         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 515 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) || \
 516         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 517         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 518 #endif
 519
 520 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 521         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 522 #endif
 523         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 524                 return;
 525         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 526                 kfree(context.ret.pointer);
 527         /* do we need to check the returned cap? Sounds no */
 528 }
 529
 530 /* --------------------------------------------------------------------------
 531                                 Event Management
 532    -------------------------------------------------------------------------- */
 533
 534 #ifdef CONFIG_ACPI_PROC_EVENT
 535 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 536
 537 LIST_HEAD(acpi_bus_event_list);
 538 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 539
 540 extern int event_is_open;
 541
 542 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 543 {
 544         struct acpi_bus_event *event;
 545         unsigned long flags = 0;
 546
 547         /* drop event on the floor if no one's listening */
 548         if (!event_is_open)
 549                 return 0;
 550
 551         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 552         if (!event)
 553                 return -ENOMEM;
 554
 555         strcpy(event->device_class, device_class);
 556         strcpy(event->bus_id, bus_id);
 557         event->type = type;
 558         event->data = data;
 559
 560         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 561         list_add_tail(&event->node, &acpi_bus_event_list);
 562         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 563
 564         wake_up_interruptible(&acpi_bus_event_queue);
 565
 566         return 0;
 567
 568 }
 569
 570 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 571
 572 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 573 {
 574         if (!device)
 575                 return -EINVAL;
 576         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 577                                              device->pnp.bus_id, type, data);
 578 }
 579
 580 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 581
 582 int acpi_bus_receive_event(struct acpi_bus_event *event)
 583 {
 584         unsigned long flags = 0;
 585         struct acpi_bus_event *entry = NULL;
 586
 587         DECLARE_WAITQUEUE(wait, current);
 588
 589
 590         if (!event)
 591                 return -EINVAL;
 592
 593         if (list_empty(&acpi_bus_event_list)) {
 594
 595                 set_current_state(TASK_INTERRUPTIBLE);
 596                 add_wait_queue(&acpi_bus_event_queue, &wait);
 597
 598                 if (list_empty(&acpi_bus_event_list))
 599                         schedule();
 600
 601                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 602                 set_current_state(TASK_RUNNING);
 603
 604                 if (signal_pending(current))
 605                         return -ERESTARTSYS;
 606         }
 607
 608         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 609         if (!list_empty(&acpi_bus_event_list)) {
 610                 entry = list_entry(acpi_bus_event_list.next,
 611                                    struct acpi_bus_event, node);
 612                 list_del(&entry->node);
 613         }
 614         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 615
 616         if (!entry)
 617                 return -ENODEV;
 618
 619         memcpy(event, entry, sizeof(struct acpi_bus_event));
 620
 621         kfree(entry);
 622
 623         return 0;
 624 }
 625
 626 #endif  /* CONFIG_ACPI_PROC_EVENT */
 627
 628 /* --------------------------------------------------------------------------
 629                              Notification Handling
 630    -------------------------------------------------------------------------- */
 631
 632 static void acpi_bus_check_device(acpi_handle handle)
 633 {
 634         struct acpi_device *device;
 635         acpi_status status;
 636         struct acpi_device_status old_status;
 637
 638         if (acpi_bus_get_device(handle, &device))
 639                 return;
 640         if (!device)
 641                 return;
 642
 643         old_status = device->status;
 644
 645         /*
 646          * Make sure this device's parent is present before we go about
 647          * messing with the device.
 648          */
 649         if (device->parent && !device->parent->status.present) {
 650                 device->status = device->parent->status;
 651                 return;
 652         }
 653
 654         status = acpi_bus_get_status(device);
 655         if (ACPI_FAILURE(status))
 656                 return;
 657
 658         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 659                 return;
 660
 661         /*
 662          * Device Insertion/Removal
 663          */
 664         if ((device->status.present) && !(old_status.present)) {
 665                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 666                 /* TBD: Handle device insertion */
 667         } else if (!(device->status.present) && (old_status.present)) {
 668                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 669                 /* TBD: Handle device removal */
 670         }
 671 }
 672
 673 static void acpi_bus_check_scope(acpi_handle handle)
 674 {
 675         /* Status Change? */
 676         acpi_bus_check_device(handle);
 677
 678         /*
 679          * TBD: Enumerate child devices within this device's scope and
 680          *       run acpi_bus_check_device()'s on them.
 681          */
 682 }
 683
 684 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 685 int register_acpi_bus_notifier(struct notifier_block *nb)
 686 {
 687         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 688 }
 689 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 690
 691 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 692 {
 693         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 694 }
 695 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 696
 697 /**
 698  * acpi_bus_notify
 699  * ---------------
 700  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 701  */
 702 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 703 {
 704         struct acpi_device *device = NULL;
 705         struct acpi_driver *driver;
 706
 707         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 708                           type, handle));
 709
 710         blocking_notifier_call_chain(&acpi_bus_notify_list,
 711                 type, (void *)handle);
 712
 713         switch (type) {
 714
 715         case ACPI_NOTIFY_BUS_CHECK:
 716                 acpi_bus_check_scope(handle);
 717                 /*
 718                  * TBD: We'll need to outsource certain events to non-ACPI
 719                  *      drivers via the device manager (device.c).
 720                  */
 721                 break;
 722
 723         case ACPI_NOTIFY_DEVICE_CHECK:
 724                 acpi_bus_check_device(handle);
 725                 /*
 726                  * TBD: We'll need to outsource certain events to non-ACPI
 727                  *      drivers via the device manager (device.c).
 728                  */
 729                 break;
 730
 731         case ACPI_NOTIFY_DEVICE_WAKE:
 732                 /* TBD */
 733                 break;
 734
 735         case ACPI_NOTIFY_EJECT_REQUEST:
 736                 /* TBD */
 737                 break;
 738
 739         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 740                 /* TBD: Exactly what does 'light' mean? */
 741                 break;
 742
 743         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 744                 /* TBD */
 745                 break;
 746
 747         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 748                 /* TBD */
 749                 break;
 750
 751         case ACPI_NOTIFY_POWER_FAULT:
 752                 /* TBD */
 753                 break;
 754
 755         default:
 756                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 757                                   "Received unknown/unsupported notification [%08x]\n",
 758                                   type));
 759                 break;
 760         }
 761
 762         acpi_bus_get_device(handle, &device);
 763         if (device) {
 764                 driver = device->driver;
 765                 if (driver && driver->ops.notify &&
 766                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 767                         driver->ops.notify(device, type);
 768         }
 769 }
 770
 771 /* --------------------------------------------------------------------------
 772                              Initialization/Cleanup
 773    -------------------------------------------------------------------------- */
 774
 775 static int __init acpi_bus_init_irq(void)
 776 {
 777         acpi_status status = AE_OK;
 778         union acpi_object arg = { ACPI_TYPE_INTEGER };
 779         struct acpi_object_list arg_list = { 1, &arg };
 780         char *message = NULL;
 781
 782
 783         /*
 784          * Let the system know what interrupt model we are using by
 785          * evaluating the \_PIC object, if exists.
 786          */
 787
 788         switch (acpi_irq_model) {
 789         case ACPI_IRQ_MODEL_PIC:
 790                 message = "PIC";
 791                 break;
 792         case ACPI_IRQ_MODEL_IOAPIC:
 793                 message = "IOAPIC";
 794                 break;
 795         case ACPI_IRQ_MODEL_IOSAPIC:
 796                 message = "IOSAPIC";
 797                 break;
 798         case ACPI_IRQ_MODEL_PLATFORM:
 799                 message = "platform specific model";
 800                 break;
 801         default:
 802                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 803                 return -ENODEV;
 804         }
 805
 806         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 807
 808         arg.integer.value = acpi_irq_model;
 809
 810         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 811         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 812                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 813                 return -ENODEV;
 814         }
 815
 816         return 0;
 817 }
 818
 819 u8 acpi_gbl_permanent_mmap;
 820
 821
 822 void __init acpi_early_init(void)
 823 {
 824         acpi_status status = AE_OK;
 825
 826         if (acpi_disabled)
 827                 return;
 828
 829         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 830
 831         /* enable workarounds, unless strict ACPI spec. compliance */
 832         if (!acpi_strict)
 833                 acpi_gbl_enable_interpreter_slack = TRUE;
 834
 835         acpi_gbl_permanent_mmap = 1;
 836
 837         /*
 838          * If the machine falls into the DMI check table,
 839          * DSDT will be copied to memory
 840          */
 841         dmi_check_system(dsdt_dmi_table);
 842
 843         status = acpi_reallocate_root_table();
 844         if (ACPI_FAILURE(status)) {
 845                 printk(KERN_ERR PREFIX
 846                        "Unable to reallocate ACPI tables\n");
 847                 goto error0;
 848         }
 849
 850         status = acpi_initialize_subsystem();
 851         if (ACPI_FAILURE(status)) {
 852                 printk(KERN_ERR PREFIX
 853                        "Unable to initialize the ACPI Interpreter\n");
 854                 goto error0;
 855         }
 856
 857         status = acpi_load_tables();
 858         if (ACPI_FAILURE(status)) {
 859                 printk(KERN_ERR PREFIX
 860                        "Unable to load the System Description Tables\n");
 861                 goto error0;
 862         }
 863
 864 #ifdef CONFIG_X86
 865         if (!acpi_ioapic) {
 866                 /* compatible (0) means level (3) */
 867                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 868                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 869                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 870                 }
 871                 /* Set PIC-mode SCI trigger type */
 872                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 873                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 874         } else {
 875                 /*
 876                  * now that acpi_gbl_FADT is initialized,
 877                  * update it with result from INT_SRC_OVR parsing
 878                  */
 879                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 880         }
 881 #endif
 882
 883         status =
 884             acpi_enable_subsystem(~
 885                                   (ACPI_NO_HARDWARE_INIT |
 886                                    ACPI_NO_ACPI_ENABLE));
 887         if (ACPI_FAILURE(status)) {
 888                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 889                 goto error0;
 890         }
 891
 892         return;
 893
 894       error0:
 895         disable_acpi();
 896         return;
 897 }
 898
 899 static int __init acpi_bus_init(void)
 900 {
 901         int result = 0;
 902         acpi_status status = AE_OK;
 903         extern acpi_status acpi_os_initialize1(void);
 904
 905         acpi_os_initialize1();
 906
 907         status =
 908             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 909         if (ACPI_FAILURE(status)) {
 910                 printk(KERN_ERR PREFIX
 911                        "Unable to start the ACPI Interpreter\n");
 912                 goto error1;
 913         }
 914
 915         /*
 916          * ACPI 2.0 requires the EC driver to be loaded and work before
 917          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 918          * is called).
 919          *
 920          * This is accomplished by looking for the ECDT table, and getting
 921          * the EC parameters out of that.
 922          */
 923         status = acpi_ec_ecdt_probe();
 924         /* Ignore result. Not having an ECDT is not fatal. */
 925
 926         acpi_bus_osc_support();
 927
 928         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 929         if (ACPI_FAILURE(status)) {
 930                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 931                 goto error1;
 932         }
 933
 934         /*
 935          * _PDC control method may load dynamic SSDT tables,
 936          * and we need to install the table handler before that.
 937          */
 938         acpi_sysfs_init();
 939
 940         acpi_early_processor_set_pdc();
 941
 942         /*
 943          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 944          * is necessary to enable it as early as possible.
 945          */
 946         acpi_boot_ec_enable();
 947
 948         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 949
 950         /* Initialize sleep structures */
 951         acpi_sleep_init();
 952
 953         /*
 954          * Get the system interrupt model and evaluate \_PIC.
 955          */
 956         result = acpi_bus_init_irq();
 957         if (result)
 958                 goto error1;
 959
 960         /*
 961          * Register the for all standard device notifications.
 962          */
 963         status =
 964             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 965                                         &acpi_bus_notify, NULL);
 966         if (ACPI_FAILURE(status)) {
 967                 printk(KERN_ERR PREFIX
 968                        "Unable to register for device notifications\n");
 969                 goto error1;
 970         }
 971
 972         /*
 973          * Create the top ACPI proc directory
 974          */
 975         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 976
 977         return 0;
 978
 979         /* Mimic structured exception handling */
 980       error1:
 981         acpi_terminate();
 982         return -ENODEV;
 983 }
 984
 985 struct kobject *acpi_kobj;
 986
 987 static int __init acpi_init(void)
 988 {
 989         int result = 0;
 990
 991
 992         if (acpi_disabled) {
 993                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 994                 return -ENODEV;
 995         }
 996
 997         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 998         if (!acpi_kobj) {
 999                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1000                 acpi_kobj = NULL;
1001         }
1002
1003         init_acpi_device_notify();
1004         result = acpi_bus_init();
1005
1006         if (!result) {
1007                 pci_mmcfg_late_init();
1008                 if (!(pm_flags & PM_APM))
1009                         pm_flags |= PM_ACPI;
1010                 else {
1011                         printk(KERN_INFO PREFIX
1012                                "APM is already active, exiting\n");
1013                         disable_acpi();
1014                         result = -ENODEV;
1015                 }
1016         } else
1017                 disable_acpi();
1018
1019         if (acpi_disabled)
1020                 return result;
1021
1022         /*
1023          * If the laptop falls into the DMI check table, the power state check
1024          * will be disabled in the course of device power transition.
1025          */
1026         dmi_check_system(power_nocheck_dmi_table);
1027
1028         acpi_scan_init();
1029         acpi_ec_init();
1030         acpi_power_init();
1031         acpi_debugfs_init();
1032         acpi_sleep_proc_init();
1033         acpi_wakeup_device_init();
1034         return result;
1035 }
1036
1037 subsys_initcall(acpi_init);