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 <acpi/apei.h>
  43#include <linux/dmi.h>
  44#include <linux/suspend.h>
  45
  46#include "internal.h"
  47
  48#define _COMPONENT		ACPI_BUS_COMPONENT
  49ACPI_MODULE_NAME("bus");
  50
  51struct acpi_device *acpi_root;
  52struct proc_dir_entry *acpi_root_dir;
  53EXPORT_SYMBOL(acpi_root_dir);
  54
  55#define STRUCT_TO_INT(s)	(*((int*)&s))
  56
  57
  58#ifdef CONFIG_X86
  59static int set_copy_dsdt(const struct dmi_system_id *id)
  60{
  61	printk(KERN_NOTICE "%s detected - "
  62		"force copy of DSDT to local memory\n", id->ident);
  63	acpi_gbl_copy_dsdt_locally = 1;
  64	return 0;
  65}
  66
  67static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68	/*
  69	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71	 */
  72	{
  73	 .callback = set_copy_dsdt,
  74	 .ident = "TOSHIBA Satellite",
  75	 .matches = {
  76		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78		},
  79	},
  80	{}
  81};
  82#else
  83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84	{}
  85};
  86#endif
  87
  88/* --------------------------------------------------------------------------
  89                                Device Management
  90   -------------------------------------------------------------------------- */
  91
  92int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  93{
  94	acpi_status status = AE_OK;
  95
  96
  97	if (!device)
  98		return -EINVAL;
  99
 100	/* TBD: Support fixed-feature devices */
 101
 102	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 103	if (ACPI_FAILURE(status) || !*device) {
 104		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 105				  handle));
 106		return -ENODEV;
 107	}
 108
 109	return 0;
 110}
 111
 112EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 115				       unsigned long long *sta)
 116{
 117	acpi_status status;
 118
 119	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 120	if (ACPI_SUCCESS(status))
 121		return AE_OK;
 122
 123	if (status == AE_NOT_FOUND) {
 124		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126		return AE_OK;
 127	}
 128	return status;
 129}
 130
 131int acpi_bus_get_status(struct acpi_device *device)
 132{
 133	acpi_status status;
 134	unsigned long long sta;
 135
 136	status = acpi_bus_get_status_handle(device->handle, &sta);
 137	if (ACPI_FAILURE(status))
 138		return -ENODEV;
 139
 140	STRUCT_TO_INT(device->status) = (int) sta;
 141
 142	if (device->status.functional && !device->status.present) {
 143		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 144		       "functional but not present;\n",
 145			device->pnp.bus_id,
 146			(u32) STRUCT_TO_INT(device->status)));
 147	}
 148
 149	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 150			  device->pnp.bus_id,
 151			  (u32) STRUCT_TO_INT(device->status)));
 152	return 0;
 153}
 154EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156void acpi_bus_private_data_handler(acpi_handle handle,
 157				   void *context)
 158{
 159	return;
 160}
 161EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163int acpi_bus_get_private_data(acpi_handle handle, void **data)
 164{
 165	acpi_status status = AE_OK;
 166
 167	if (!*data)
 168		return -EINVAL;
 169
 170	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 171	if (ACPI_FAILURE(status) || !*data) {
 172		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 173				handle));
 174		return -ENODEV;
 175	}
 176
 177	return 0;
 178}
 179EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181/* --------------------------------------------------------------------------
 182                                 Power Management
 183   -------------------------------------------------------------------------- */
 184
 185static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 186{
 187	int result = 0;
 188	acpi_status status = 0;
 189	unsigned long long psc = 0;
 190
 191	if (!device || !state)
 192		return -EINVAL;
 193
 194	*state = ACPI_STATE_UNKNOWN;
 195
 196	if (device->flags.power_manageable) {
 197		/*
 198		 * Get the device's power state either directly (via _PSC) or
 199		 * indirectly (via power resources).
 200		 */
 201		if (device->power.flags.power_resources) {
 202			result = acpi_power_get_inferred_state(device, state);
 203			if (result)
 204				return result;
 205		} else if (device->power.flags.explicit_get) {
 206			status = acpi_evaluate_integer(device->handle, "_PSC",
 207						       NULL, &psc);
 208			if (ACPI_FAILURE(status))
 209				return -ENODEV;
 210			*state = (int)psc;
 211		}
 212	} else {
 213		/* TBD: Non-recursive algorithm for walking up hierarchy. */
 214		*state = device->parent ?
 215			device->parent->power.state : ACPI_STATE_D0;
 216	}
 217
 218	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 219			  device->pnp.bus_id, *state));
 220
 221	return 0;
 222}
 223
 224
 225static int __acpi_bus_set_power(struct acpi_device *device, int state)
 226{
 227	int result = 0;
 228	acpi_status status = AE_OK;
 229	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 230
 231	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 232		return -EINVAL;
 233
 234	/* Make sure this is a valid target state */
 235
 236	if (state == device->power.state) {
 237		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 238				  state));
 239		return 0;
 240	}
 241
 242	if (!device->power.states[state].flags.valid) {
 243		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 244		return -ENODEV;
 245	}
 246	if (device->parent && (state < device->parent->power.state)) {
 247		printk(KERN_WARNING PREFIX
 248			      "Cannot set device to a higher-powered"
 249			      " state than parent\n");
 250		return -ENODEV;
 251	}
 252
 253	/*
 254	 * Transition Power
 255	 * ----------------
 256	 * On transitions to a high-powered state we first apply power (via
 257	 * power resources) then evalute _PSx.  Conversly for transitions to
 258	 * a lower-powered state.
 259	 */
 260	if (state < device->power.state) {
 261		if (device->power.flags.power_resources) {
 262			result = acpi_power_transition(device, state);
 263			if (result)
 264				goto end;
 265		}
 266		if (device->power.states[state].flags.explicit_set) {
 267			status = acpi_evaluate_object(device->handle,
 268						      object_name, NULL, NULL);
 269			if (ACPI_FAILURE(status)) {
 270				result = -ENODEV;
 271				goto end;
 272			}
 273		}
 274	} else {
 275		if (device->power.states[state].flags.explicit_set) {
 276			status = acpi_evaluate_object(device->handle,
 277						      object_name, NULL, NULL);
 278			if (ACPI_FAILURE(status)) {
 279				result = -ENODEV;
 280				goto end;
 281			}
 282		}
 283		if (device->power.flags.power_resources) {
 284			result = acpi_power_transition(device, state);
 285			if (result)
 286				goto end;
 287		}
 288	}
 289
 290      end:
 291	if (result)
 292		printk(KERN_WARNING PREFIX
 293			      "Device [%s] failed to transition to D%d\n",
 294			      device->pnp.bus_id, state);
 295	else {
 296		device->power.state = state;
 297		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 298				  "Device [%s] transitioned to D%d\n",
 299				  device->pnp.bus_id, state));
 300	}
 301
 302	return result;
 303}
 304
 305
 306int acpi_bus_set_power(acpi_handle handle, int state)
 307{
 308	struct acpi_device *device;
 309	int result;
 310
 311	result = acpi_bus_get_device(handle, &device);
 312	if (result)
 313		return result;
 314
 315	if (!device->flags.power_manageable) {
 316		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 317				"Device [%s] is not power manageable\n",
 318				dev_name(&device->dev)));
 319		return -ENODEV;
 320	}
 321
 322	return __acpi_bus_set_power(device, state);
 323}
 324EXPORT_SYMBOL(acpi_bus_set_power);
 325
 326
 327int acpi_bus_init_power(struct acpi_device *device)
 328{
 329	int state;
 330	int result;
 331
 332	if (!device)
 333		return -EINVAL;
 334
 335	device->power.state = ACPI_STATE_UNKNOWN;
 336
 337	result = __acpi_bus_get_power(device, &state);
 338	if (result)
 339		return result;
 340
 341	if (device->power.flags.power_resources)
 342		result = acpi_power_on_resources(device, state);
 343
 344	if (!result)
 345		device->power.state = state;
 346
 347	return result;
 348}
 349
 350
 351int acpi_bus_update_power(acpi_handle handle, int *state_p)
 352{
 353	struct acpi_device *device;
 354	int state;
 355	int result;
 356
 357	result = acpi_bus_get_device(handle, &device);
 358	if (result)
 359		return result;
 360
 361	result = __acpi_bus_get_power(device, &state);
 362	if (result)
 363		return result;
 364
 365	result = __acpi_bus_set_power(device, state);
 366	if (!result && state_p)
 367		*state_p = state;
 368
 369	return result;
 370}
 371EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 372
 373
 374bool acpi_bus_power_manageable(acpi_handle handle)
 375{
 376	struct acpi_device *device;
 377	int result;
 378
 379	result = acpi_bus_get_device(handle, &device);
 380	return result ? false : device->flags.power_manageable;
 381}
 382
 383EXPORT_SYMBOL(acpi_bus_power_manageable);
 384
 385bool acpi_bus_can_wakeup(acpi_handle handle)
 386{
 387	struct acpi_device *device;
 388	int result;
 389
 390	result = acpi_bus_get_device(handle, &device);
 391	return result ? false : device->wakeup.flags.valid;
 392}
 393
 394EXPORT_SYMBOL(acpi_bus_can_wakeup);
 395
 396static void acpi_print_osc_error(acpi_handle handle,
 397	struct acpi_osc_context *context, char *error)
 398{
 399	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 400	int i;
 401
 402	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 403		printk(KERN_DEBUG "%s\n", error);
 404	else {
 405		printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 406		kfree(buffer.pointer);
 407	}
 408	printk(KERN_DEBUG"_OSC request data:");
 409	for (i = 0; i < context->cap.length; i += sizeof(u32))
 410		printk("%x ", *((u32 *)(context->cap.pointer + i)));
 411	printk("\n");
 412}
 413
 414static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 415{
 416	int i;
 417	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 418		24, 26, 28, 30, 32, 34};
 419
 420	if (strlen(str) != 36)
 421		return AE_BAD_PARAMETER;
 422	for (i = 0; i < 36; i++) {
 423		if (i == 8 || i == 13 || i == 18 || i == 23) {
 424			if (str[i] != '-')
 425				return AE_BAD_PARAMETER;
 426		} else if (!isxdigit(str[i]))
 427			return AE_BAD_PARAMETER;
 428	}
 429	for (i = 0; i < 16; i++) {
 430		uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 431		uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 432	}
 433	return AE_OK;
 434}
 
 435
 436acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 437{
 438	acpi_status status;
 439	struct acpi_object_list input;
 440	union acpi_object in_params[4];
 441	union acpi_object *out_obj;
 442	u8 uuid[16];
 443	u32 errors;
 444	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 445
 446	if (!context)
 447		return AE_ERROR;
 448	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 449		return AE_ERROR;
 450	context->ret.length = ACPI_ALLOCATE_BUFFER;
 451	context->ret.pointer = NULL;
 452
 453	/* Setting up input parameters */
 454	input.count = 4;
 455	input.pointer = in_params;
 456	in_params[0].type 		= ACPI_TYPE_BUFFER;
 457	in_params[0].buffer.length 	= 16;
 458	in_params[0].buffer.pointer	= uuid;
 459	in_params[1].type 		= ACPI_TYPE_INTEGER;
 460	in_params[1].integer.value 	= context->rev;
 461	in_params[2].type 		= ACPI_TYPE_INTEGER;
 462	in_params[2].integer.value	= context->cap.length/sizeof(u32);
 463	in_params[3].type		= ACPI_TYPE_BUFFER;
 464	in_params[3].buffer.length 	= context->cap.length;
 465	in_params[3].buffer.pointer 	= context->cap.pointer;
 466
 467	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 468	if (ACPI_FAILURE(status))
 469		return status;
 470
 471	if (!output.length)
 472		return AE_NULL_OBJECT;
 473
 474	out_obj = output.pointer;
 475	if (out_obj->type != ACPI_TYPE_BUFFER
 476		|| out_obj->buffer.length != context->cap.length) {
 477		acpi_print_osc_error(handle, context,
 478			"_OSC evaluation returned wrong type");
 479		status = AE_TYPE;
 480		goto out_kfree;
 481	}
 482	/* Need to ignore the bit0 in result code */
 483	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 484	if (errors) {
 485		if (errors & OSC_REQUEST_ERROR)
 486			acpi_print_osc_error(handle, context,
 487				"_OSC request failed");
 488		if (errors & OSC_INVALID_UUID_ERROR)
 489			acpi_print_osc_error(handle, context,
 490				"_OSC invalid UUID");
 491		if (errors & OSC_INVALID_REVISION_ERROR)
 492			acpi_print_osc_error(handle, context,
 493				"_OSC invalid revision");
 494		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 495			if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 496			    & OSC_QUERY_ENABLE)
 497				goto out_success;
 498			status = AE_SUPPORT;
 499			goto out_kfree;
 500		}
 501		status = AE_ERROR;
 502		goto out_kfree;
 503	}
 504out_success:
 505	context->ret.length = out_obj->buffer.length;
 506	context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 
 507	if (!context->ret.pointer) {
 508		status =  AE_NO_MEMORY;
 509		goto out_kfree;
 510	}
 511	memcpy(context->ret.pointer, out_obj->buffer.pointer,
 512		context->ret.length);
 513	status =  AE_OK;
 514
 515out_kfree:
 516	kfree(output.pointer);
 517	if (status != AE_OK)
 518		context->ret.pointer = NULL;
 519	return status;
 520}
 521EXPORT_SYMBOL(acpi_run_osc);
 522
 523bool osc_sb_apei_support_acked;
 524static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 525static void acpi_bus_osc_support(void)
 526{
 527	u32 capbuf[2];
 528	struct acpi_osc_context context = {
 529		.uuid_str = sb_uuid_str,
 530		.rev = 1,
 531		.cap.length = 8,
 532		.cap.pointer = capbuf,
 533	};
 534	acpi_handle handle;
 535
 536	capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 537	capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 538#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 539			defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 540	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 541#endif
 542
 543#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 544	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 545#endif
 546
 
 
 547	if (!ghes_disable)
 548		capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 549	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 550		return;
 551	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 552		u32 *capbuf_ret = context.ret.pointer;
 553		if (context.ret.length > OSC_SUPPORT_TYPE)
 554			osc_sb_apei_support_acked =
 555				capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 556		kfree(context.ret.pointer);
 557	}
 558	/* do we need to check other returned cap? Sounds no */
 559}
 560
 561/* --------------------------------------------------------------------------
 562                                Event Management
 563   -------------------------------------------------------------------------- */
 564
 565#ifdef CONFIG_ACPI_PROC_EVENT
 566static DEFINE_SPINLOCK(acpi_bus_event_lock);
 567
 568LIST_HEAD(acpi_bus_event_list);
 569DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 570
 571extern int event_is_open;
 572
 573int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 574{
 575	struct acpi_bus_event *event;
 576	unsigned long flags = 0;
 577
 578	/* drop event on the floor if no one's listening */
 579	if (!event_is_open)
 580		return 0;
 581
 582	event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 583	if (!event)
 584		return -ENOMEM;
 585
 586	strcpy(event->device_class, device_class);
 587	strcpy(event->bus_id, bus_id);
 588	event->type = type;
 589	event->data = data;
 590
 591	spin_lock_irqsave(&acpi_bus_event_lock, flags);
 592	list_add_tail(&event->node, &acpi_bus_event_list);
 593	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 594
 595	wake_up_interruptible(&acpi_bus_event_queue);
 596
 597	return 0;
 598
 599}
 600
 601EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 602
 603int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 604{
 605	if (!device)
 606		return -EINVAL;
 607	return acpi_bus_generate_proc_event4(device->pnp.device_class,
 608					     device->pnp.bus_id, type, data);
 609}
 610
 611EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 612
 613int acpi_bus_receive_event(struct acpi_bus_event *event)
 614{
 615	unsigned long flags = 0;
 616	struct acpi_bus_event *entry = NULL;
 617
 618	DECLARE_WAITQUEUE(wait, current);
 619
 620
 621	if (!event)
 622		return -EINVAL;
 623
 624	if (list_empty(&acpi_bus_event_list)) {
 625
 626		set_current_state(TASK_INTERRUPTIBLE);
 627		add_wait_queue(&acpi_bus_event_queue, &wait);
 628
 629		if (list_empty(&acpi_bus_event_list))
 630			schedule();
 631
 632		remove_wait_queue(&acpi_bus_event_queue, &wait);
 633		set_current_state(TASK_RUNNING);
 634
 635		if (signal_pending(current))
 636			return -ERESTARTSYS;
 637	}
 638
 639	spin_lock_irqsave(&acpi_bus_event_lock, flags);
 640	if (!list_empty(&acpi_bus_event_list)) {
 641		entry = list_entry(acpi_bus_event_list.next,
 642				   struct acpi_bus_event, node);
 643		list_del(&entry->node);
 644	}
 645	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 646
 647	if (!entry)
 648		return -ENODEV;
 649
 650	memcpy(event, entry, sizeof(struct acpi_bus_event));
 651
 652	kfree(entry);
 653
 654	return 0;
 655}
 656
 657#endif	/* CONFIG_ACPI_PROC_EVENT */
 658
 659/* --------------------------------------------------------------------------
 660                             Notification Handling
 661   -------------------------------------------------------------------------- */
 662
 663static void acpi_bus_check_device(acpi_handle handle)
 664{
 665	struct acpi_device *device;
 666	acpi_status status;
 667	struct acpi_device_status old_status;
 668
 669	if (acpi_bus_get_device(handle, &device))
 670		return;
 671	if (!device)
 672		return;
 673
 674	old_status = device->status;
 675
 676	/*
 677	 * Make sure this device's parent is present before we go about
 678	 * messing with the device.
 679	 */
 680	if (device->parent && !device->parent->status.present) {
 681		device->status = device->parent->status;
 682		return;
 683	}
 684
 685	status = acpi_bus_get_status(device);
 686	if (ACPI_FAILURE(status))
 687		return;
 688
 689	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 690		return;
 691
 692	/*
 693	 * Device Insertion/Removal
 694	 */
 695	if ((device->status.present) && !(old_status.present)) {
 696		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 697		/* TBD: Handle device insertion */
 698	} else if (!(device->status.present) && (old_status.present)) {
 699		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 700		/* TBD: Handle device removal */
 701	}
 702}
 703
 704static void acpi_bus_check_scope(acpi_handle handle)
 705{
 706	/* Status Change? */
 707	acpi_bus_check_device(handle);
 708
 709	/*
 710	 * TBD: Enumerate child devices within this device's scope and
 711	 *       run acpi_bus_check_device()'s on them.
 712	 */
 713}
 714
 715static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 716int register_acpi_bus_notifier(struct notifier_block *nb)
 717{
 718	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 719}
 720EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 721
 722void unregister_acpi_bus_notifier(struct notifier_block *nb)
 723{
 724	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 725}
 726EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 727
 728/**
 729 * acpi_bus_notify
 730 * ---------------
 731 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 732 */
 733static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 734{
 735	struct acpi_device *device = NULL;
 736	struct acpi_driver *driver;
 737
 738	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 739			  type, handle));
 740
 741	blocking_notifier_call_chain(&acpi_bus_notify_list,
 742		type, (void *)handle);
 743
 744	switch (type) {
 745
 746	case ACPI_NOTIFY_BUS_CHECK:
 747		acpi_bus_check_scope(handle);
 748		/*
 749		 * TBD: We'll need to outsource certain events to non-ACPI
 750		 *      drivers via the device manager (device.c).
 751		 */
 752		break;
 753
 754	case ACPI_NOTIFY_DEVICE_CHECK:
 755		acpi_bus_check_device(handle);
 756		/*
 757		 * TBD: We'll need to outsource certain events to non-ACPI
 758		 *      drivers via the device manager (device.c).
 759		 */
 760		break;
 761
 762	case ACPI_NOTIFY_DEVICE_WAKE:
 763		/* TBD */
 764		break;
 765
 766	case ACPI_NOTIFY_EJECT_REQUEST:
 767		/* TBD */
 768		break;
 769
 770	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 
 771		/* TBD: Exactly what does 'light' mean? */
 772		break;
 773
 774	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 775		/* TBD */
 
 776		break;
 777
 778	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 779		/* TBD */
 
 780		break;
 781
 782	case ACPI_NOTIFY_POWER_FAULT:
 783		/* TBD */
 784		break;
 785
 786	default:
 787		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 788				  "Received unknown/unsupported notification [%08x]\n",
 789				  type));
 790		break;
 791	}
 792
 793	acpi_bus_get_device(handle, &device);
 794	if (device) {
 795		driver = device->driver;
 796		if (driver && driver->ops.notify &&
 797		    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 798			driver->ops.notify(device, type);
 
 
 
 
 
 
 
 
 
 
 
 
 799	}
 
 
 
 
 
 800}
 801
 802/* --------------------------------------------------------------------------
 803                             Initialization/Cleanup
 804   -------------------------------------------------------------------------- */
 805
 806static int __init acpi_bus_init_irq(void)
 807{
 808	acpi_status status = AE_OK;
 809	union acpi_object arg = { ACPI_TYPE_INTEGER };
 810	struct acpi_object_list arg_list = { 1, &arg };
 811	char *message = NULL;
 812
 813
 814	/*
 815	 * Let the system know what interrupt model we are using by
 816	 * evaluating the \_PIC object, if exists.
 817	 */
 818
 819	switch (acpi_irq_model) {
 820	case ACPI_IRQ_MODEL_PIC:
 821		message = "PIC";
 822		break;
 823	case ACPI_IRQ_MODEL_IOAPIC:
 824		message = "IOAPIC";
 825		break;
 826	case ACPI_IRQ_MODEL_IOSAPIC:
 827		message = "IOSAPIC";
 828		break;
 829	case ACPI_IRQ_MODEL_PLATFORM:
 830		message = "platform specific model";
 831		break;
 832	default:
 833		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 834		return -ENODEV;
 835	}
 836
 837	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 838
 839	arg.integer.value = acpi_irq_model;
 840
 841	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 842	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 843		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 844		return -ENODEV;
 845	}
 846
 847	return 0;
 848}
 849
 850u8 acpi_gbl_permanent_mmap;
 851
 852
 853void __init acpi_early_init(void)
 854{
 855	acpi_status status = AE_OK;
 856
 857	if (acpi_disabled)
 858		return;
 859
 860	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 861
 862	/* enable workarounds, unless strict ACPI spec. compliance */
 863	if (!acpi_strict)
 864		acpi_gbl_enable_interpreter_slack = TRUE;
 865
 866	acpi_gbl_permanent_mmap = 1;
 867
 868	/*
 869	 * If the machine falls into the DMI check table,
 870	 * DSDT will be copied to memory
 871	 */
 872	dmi_check_system(dsdt_dmi_table);
 873
 874	status = acpi_reallocate_root_table();
 875	if (ACPI_FAILURE(status)) {
 876		printk(KERN_ERR PREFIX
 877		       "Unable to reallocate ACPI tables\n");
 878		goto error0;
 879	}
 880
 881	status = acpi_initialize_subsystem();
 882	if (ACPI_FAILURE(status)) {
 883		printk(KERN_ERR PREFIX
 884		       "Unable to initialize the ACPI Interpreter\n");
 885		goto error0;
 886	}
 887
 888	status = acpi_load_tables();
 889	if (ACPI_FAILURE(status)) {
 890		printk(KERN_ERR PREFIX
 891		       "Unable to load the System Description Tables\n");
 892		goto error0;
 893	}
 894
 895#ifdef CONFIG_X86
 896	if (!acpi_ioapic) {
 897		/* compatible (0) means level (3) */
 898		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 899			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 900			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 901		}
 902		/* Set PIC-mode SCI trigger type */
 903		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 904					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 905	} else {
 906		/*
 907		 * now that acpi_gbl_FADT is initialized,
 908		 * update it with result from INT_SRC_OVR parsing
 909		 */
 910		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 911	}
 912#endif
 913
 914	status =
 915	    acpi_enable_subsystem(~
 916				  (ACPI_NO_HARDWARE_INIT |
 917				   ACPI_NO_ACPI_ENABLE));
 918	if (ACPI_FAILURE(status)) {
 919		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 920		goto error0;
 921	}
 922
 
 
 
 
 
 
 
 
 923	return;
 924
 925      error0:
 926	disable_acpi();
 927	return;
 928}
 929
 930static int __init acpi_bus_init(void)
 931{
 932	int result = 0;
 933	acpi_status status = AE_OK;
 934	extern acpi_status acpi_os_initialize1(void);
 935
 936	acpi_os_initialize1();
 937
 938	status =
 939	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 940	if (ACPI_FAILURE(status)) {
 941		printk(KERN_ERR PREFIX
 942		       "Unable to start the ACPI Interpreter\n");
 943		goto error1;
 944	}
 945
 946	/*
 947	 * ACPI 2.0 requires the EC driver to be loaded and work before
 948	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 949	 * is called).
 950	 *
 951	 * This is accomplished by looking for the ECDT table, and getting
 952	 * the EC parameters out of that.
 953	 */
 954	status = acpi_ec_ecdt_probe();
 955	/* Ignore result. Not having an ECDT is not fatal. */
 956
 957	acpi_bus_osc_support();
 958
 959	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 960	if (ACPI_FAILURE(status)) {
 961		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 962		goto error1;
 963	}
 964
 965	/*
 
 
 
 
 
 
 966	 * _PDC control method may load dynamic SSDT tables,
 967	 * and we need to install the table handler before that.
 968	 */
 969	acpi_sysfs_init();
 970
 971	acpi_early_processor_set_pdc();
 972
 973	/*
 974	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 975	 * is necessary to enable it as early as possible.
 976	 */
 977	acpi_boot_ec_enable();
 978
 979	printk(KERN_INFO PREFIX "Interpreter enabled\n");
 980
 981	/* Initialize sleep structures */
 982	acpi_sleep_init();
 983
 984	/*
 985	 * Get the system interrupt model and evaluate \_PIC.
 986	 */
 987	result = acpi_bus_init_irq();
 988	if (result)
 989		goto error1;
 990
 991	/*
 992	 * Register the for all standard device notifications.
 993	 */
 994	status =
 995	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 996					&acpi_bus_notify, NULL);
 997	if (ACPI_FAILURE(status)) {
 998		printk(KERN_ERR PREFIX
 999		       "Unable to register for device notifications\n");
1000		goto error1;
1001	}
1002
1003	/*
1004	 * Create the top ACPI proc directory
1005	 */
1006	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1007
1008	return 0;
1009
1010	/* Mimic structured exception handling */
1011      error1:
1012	acpi_terminate();
1013	return -ENODEV;
1014}
1015
1016struct kobject *acpi_kobj;
 
1017
1018static int __init acpi_init(void)
1019{
1020	int result;
1021
1022	if (acpi_disabled) {
1023		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1024		return -ENODEV;
1025	}
1026
1027	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1028	if (!acpi_kobj) {
1029		printk(KERN_WARNING "%s: kset create error\n", __func__);
1030		acpi_kobj = NULL;
1031	}
1032
1033	init_acpi_device_notify();
1034	result = acpi_bus_init();
1035	if (result) {
1036		disable_acpi();
1037		return result;
1038	}
1039
1040	pci_mmcfg_late_init();
1041	acpi_scan_init();
1042	acpi_ec_init();
1043	acpi_debugfs_init();
1044	acpi_sleep_proc_init();
1045	acpi_wakeup_device_init();
1046	return 0;
1047}
1048
1049subsys_initcall(acpi_init);