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 const char *state_string(int state)
 186{
 187	switch (state) {
 188	case ACPI_STATE_D0:
 189		return "D0";
 190	case ACPI_STATE_D1:
 191		return "D1";
 192	case ACPI_STATE_D2:
 193		return "D2";
 194	case ACPI_STATE_D3_HOT:
 195		return "D3hot";
 196	case ACPI_STATE_D3_COLD:
 197		return "D3";
 198	default:
 199		return "(unknown)";
 200	}
 201}
 202
 203static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 204{
 205	int result = ACPI_STATE_UNKNOWN;
 206
 207	if (!device || !state)
 208		return -EINVAL;
 209
 210	if (!device->flags.power_manageable) {
 211		/* TBD: Non-recursive algorithm for walking up hierarchy. */
 212		*state = device->parent ?
 213			device->parent->power.state : ACPI_STATE_D0;
 214		goto out;
 215	}
 216
 217	/*
 218	 * Get the device's power state either directly (via _PSC) or
 219	 * indirectly (via power resources).
 220	 */
 221	if (device->power.flags.explicit_get) {
 222		unsigned long long psc;
 223		acpi_status status = acpi_evaluate_integer(device->handle,
 224							   "_PSC", NULL, &psc);
 225		if (ACPI_FAILURE(status))
 226			return -ENODEV;
 227
 228		result = psc;
 229	}
 230	/* The test below covers ACPI_STATE_UNKNOWN too. */
 231	if (result <= ACPI_STATE_D2) {
 232	  ; /* Do nothing. */
 233	} else if (device->power.flags.power_resources) {
 234		int error = acpi_power_get_inferred_state(device, &result);
 235		if (error)
 236			return error;
 237	} else if (result == ACPI_STATE_D3_HOT) {
 238		result = ACPI_STATE_D3;
 239	}
 240
 241	/*
 242	 * If we were unsure about the device parent's power state up to this
 243	 * point, the fact that the device is in D0 implies that the parent has
 244	 * to be in D0 too.
 245	 */
 246	if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
 247	    && result == ACPI_STATE_D0)
 248		device->parent->power.state = ACPI_STATE_D0;
 249
 250	*state = result;
 251
 252 out:
 253	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
 254			  device->pnp.bus_id, state_string(*state)));
 255
 256	return 0;
 257}
 258
 259
 260static int __acpi_bus_set_power(struct acpi_device *device, int state)
 261{
 262	int result = 0;
 263	acpi_status status = AE_OK;
 264	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 265
 266	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 267		return -EINVAL;
 268
 269	/* Make sure this is a valid target state */
 270
 271	if (state == device->power.state) {
 272		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 273				  state_string(state)));
 274		return 0;
 275	}
 276
 277	if (!device->power.states[state].flags.valid) {
 278		printk(KERN_WARNING PREFIX "Device does not support %s\n",
 279		       state_string(state));
 280		return -ENODEV;
 281	}
 282	if (device->parent && (state < device->parent->power.state)) {
 283		printk(KERN_WARNING PREFIX
 284			      "Cannot set device to a higher-powered"
 285			      " state than parent\n");
 286		return -ENODEV;
 287	}
 288
 289	/* For D3cold we should execute _PS3, not _PS4. */
 290	if (state == ACPI_STATE_D3_COLD)
 291		object_name[3] = '3';
 292
 293	/*
 294	 * Transition Power
 295	 * ----------------
 296	 * On transitions to a high-powered state we first apply power (via
 297	 * power resources) then evalute _PSx.  Conversly for transitions to
 298	 * a lower-powered state.
 299	 */
 300	if (state < device->power.state) {
 301		if (device->power.flags.power_resources) {
 302			result = acpi_power_transition(device, state);
 303			if (result)
 304				goto end;
 305		}
 306		if (device->power.states[state].flags.explicit_set) {
 307			status = acpi_evaluate_object(device->handle,
 308						      object_name, NULL, NULL);
 309			if (ACPI_FAILURE(status)) {
 310				result = -ENODEV;
 311				goto end;
 312			}
 313		}
 314	} else {
 315		if (device->power.states[state].flags.explicit_set) {
 316			status = acpi_evaluate_object(device->handle,
 317						      object_name, NULL, NULL);
 318			if (ACPI_FAILURE(status)) {
 319				result = -ENODEV;
 320				goto end;
 321			}
 322		}
 323		if (device->power.flags.power_resources) {
 324			result = acpi_power_transition(device, state);
 325			if (result)
 326				goto end;
 327		}
 328	}
 329
 330      end:
 331	if (result)
 332		printk(KERN_WARNING PREFIX
 333			      "Device [%s] failed to transition to %s\n",
 334			      device->pnp.bus_id, state_string(state));
 335	else {
 336		device->power.state = state;
 337		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 338				  "Device [%s] transitioned to %s\n",
 339				  device->pnp.bus_id, state_string(state)));
 340	}
 341
 342	return result;
 343}
 344
 345
 346int acpi_bus_set_power(acpi_handle handle, int state)
 347{
 348	struct acpi_device *device;
 349	int result;
 350
 351	result = acpi_bus_get_device(handle, &device);
 352	if (result)
 353		return result;
 354
 355	if (!device->flags.power_manageable) {
 356		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 357				"Device [%s] is not power manageable\n",
 358				dev_name(&device->dev)));
 359		return -ENODEV;
 360	}
 361
 362	return __acpi_bus_set_power(device, state);
 363}
 364EXPORT_SYMBOL(acpi_bus_set_power);
 365
 366
 367int acpi_bus_init_power(struct acpi_device *device)
 368{
 369	int state;
 370	int result;
 371
 372	if (!device)
 373		return -EINVAL;
 374
 375	device->power.state = ACPI_STATE_UNKNOWN;
 376
 377	result = __acpi_bus_get_power(device, &state);
 378	if (result)
 379		return result;
 380
 381	if (device->power.flags.power_resources)
 382		result = acpi_power_on_resources(device, state);
 383
 384	if (!result)
 385		device->power.state = state;
 386
 387	return result;
 388}
 389
 390
 391int acpi_bus_update_power(acpi_handle handle, int *state_p)
 392{
 393	struct acpi_device *device;
 394	int state;
 395	int result;
 396
 397	result = acpi_bus_get_device(handle, &device);
 398	if (result)
 399		return result;
 400
 401	result = __acpi_bus_get_power(device, &state);
 402	if (result)
 403		return result;
 404
 405	result = __acpi_bus_set_power(device, state);
 406	if (!result && state_p)
 407		*state_p = state;
 408
 409	return result;
 410}
 411EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 412
 413
 414bool acpi_bus_power_manageable(acpi_handle handle)
 415{
 416	struct acpi_device *device;
 417	int result;
 418
 419	result = acpi_bus_get_device(handle, &device);
 420	return result ? false : device->flags.power_manageable;
 421}
 422
 423EXPORT_SYMBOL(acpi_bus_power_manageable);
 424
 425bool acpi_bus_can_wakeup(acpi_handle handle)
 426{
 427	struct acpi_device *device;
 428	int result;
 429
 430	result = acpi_bus_get_device(handle, &device);
 431	return result ? false : device->wakeup.flags.valid;
 432}
 433
 434EXPORT_SYMBOL(acpi_bus_can_wakeup);
 435
 436static void acpi_print_osc_error(acpi_handle handle,
 437	struct acpi_osc_context *context, char *error)
 438{
 439	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 440	int i;
 441
 442	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 443		printk(KERN_DEBUG "%s\n", error);
 444	else {
 445		printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 446		kfree(buffer.pointer);
 447	}
 448	printk(KERN_DEBUG"_OSC request data:");
 449	for (i = 0; i < context->cap.length; i += sizeof(u32))
 450		printk("%x ", *((u32 *)(context->cap.pointer + i)));
 451	printk("\n");
 452}
 453
 454static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 455{
 456	int i;
 457	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 458		24, 26, 28, 30, 32, 34};
 459
 460	if (strlen(str) != 36)
 461		return AE_BAD_PARAMETER;
 462	for (i = 0; i < 36; i++) {
 463		if (i == 8 || i == 13 || i == 18 || i == 23) {
 464			if (str[i] != '-')
 465				return AE_BAD_PARAMETER;
 466		} else if (!isxdigit(str[i]))
 467			return AE_BAD_PARAMETER;
 468	}
 469	for (i = 0; i < 16; i++) {
 470		uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 471		uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 472	}
 473	return AE_OK;
 474}
 
 475
 476acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 477{
 478	acpi_status status;
 479	struct acpi_object_list input;
 480	union acpi_object in_params[4];
 481	union acpi_object *out_obj;
 482	u8 uuid[16];
 483	u32 errors;
 484	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 485
 486	if (!context)
 487		return AE_ERROR;
 488	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 489		return AE_ERROR;
 490	context->ret.length = ACPI_ALLOCATE_BUFFER;
 491	context->ret.pointer = NULL;
 492
 493	/* Setting up input parameters */
 494	input.count = 4;
 495	input.pointer = in_params;
 496	in_params[0].type 		= ACPI_TYPE_BUFFER;
 497	in_params[0].buffer.length 	= 16;
 498	in_params[0].buffer.pointer	= uuid;
 499	in_params[1].type 		= ACPI_TYPE_INTEGER;
 500	in_params[1].integer.value 	= context->rev;
 501	in_params[2].type 		= ACPI_TYPE_INTEGER;
 502	in_params[2].integer.value	= context->cap.length/sizeof(u32);
 503	in_params[3].type		= ACPI_TYPE_BUFFER;
 504	in_params[3].buffer.length 	= context->cap.length;
 505	in_params[3].buffer.pointer 	= context->cap.pointer;
 506
 507	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 508	if (ACPI_FAILURE(status))
 509		return status;
 510
 511	if (!output.length)
 512		return AE_NULL_OBJECT;
 513
 514	out_obj = output.pointer;
 515	if (out_obj->type != ACPI_TYPE_BUFFER
 516		|| out_obj->buffer.length != context->cap.length) {
 517		acpi_print_osc_error(handle, context,
 518			"_OSC evaluation returned wrong type");
 519		status = AE_TYPE;
 520		goto out_kfree;
 521	}
 522	/* Need to ignore the bit0 in result code */
 523	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 524	if (errors) {
 525		if (errors & OSC_REQUEST_ERROR)
 526			acpi_print_osc_error(handle, context,
 527				"_OSC request failed");
 528		if (errors & OSC_INVALID_UUID_ERROR)
 529			acpi_print_osc_error(handle, context,
 530				"_OSC invalid UUID");
 531		if (errors & OSC_INVALID_REVISION_ERROR)
 532			acpi_print_osc_error(handle, context,
 533				"_OSC invalid revision");
 534		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 535			if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 536			    & OSC_QUERY_ENABLE)
 537				goto out_success;
 538			status = AE_SUPPORT;
 539			goto out_kfree;
 540		}
 541		status = AE_ERROR;
 542		goto out_kfree;
 543	}
 544out_success:
 545	context->ret.length = out_obj->buffer.length;
 546	context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 
 547	if (!context->ret.pointer) {
 548		status =  AE_NO_MEMORY;
 549		goto out_kfree;
 550	}
 551	memcpy(context->ret.pointer, out_obj->buffer.pointer,
 552		context->ret.length);
 553	status =  AE_OK;
 554
 555out_kfree:
 556	kfree(output.pointer);
 557	if (status != AE_OK)
 558		context->ret.pointer = NULL;
 559	return status;
 560}
 561EXPORT_SYMBOL(acpi_run_osc);
 562
 563bool osc_sb_apei_support_acked;
 564static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 565static void acpi_bus_osc_support(void)
 566{
 567	u32 capbuf[2];
 568	struct acpi_osc_context context = {
 569		.uuid_str = sb_uuid_str,
 570		.rev = 1,
 571		.cap.length = 8,
 572		.cap.pointer = capbuf,
 573	};
 574	acpi_handle handle;
 575
 576	capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 577	capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 578#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 579			defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 580	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 581#endif
 582
 583#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 584	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 585#endif
 586
 
 
 587	if (!ghes_disable)
 588		capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 589	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 590		return;
 591	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 592		u32 *capbuf_ret = context.ret.pointer;
 593		if (context.ret.length > OSC_SUPPORT_TYPE)
 594			osc_sb_apei_support_acked =
 595				capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 596		kfree(context.ret.pointer);
 597	}
 598	/* do we need to check other returned cap? Sounds no */
 599}
 600
 601/* --------------------------------------------------------------------------
 602                                Event Management
 603   -------------------------------------------------------------------------- */
 604
 605#ifdef CONFIG_ACPI_PROC_EVENT
 606static DEFINE_SPINLOCK(acpi_bus_event_lock);
 607
 608LIST_HEAD(acpi_bus_event_list);
 609DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 610
 611extern int event_is_open;
 612
 613int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 614{
 615	struct acpi_bus_event *event;
 616	unsigned long flags = 0;
 617
 618	/* drop event on the floor if no one's listening */
 619	if (!event_is_open)
 620		return 0;
 621
 622	event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 623	if (!event)
 624		return -ENOMEM;
 625
 626	strcpy(event->device_class, device_class);
 627	strcpy(event->bus_id, bus_id);
 628	event->type = type;
 629	event->data = data;
 630
 631	spin_lock_irqsave(&acpi_bus_event_lock, flags);
 632	list_add_tail(&event->node, &acpi_bus_event_list);
 633	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 634
 635	wake_up_interruptible(&acpi_bus_event_queue);
 636
 637	return 0;
 638
 639}
 640
 641EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 642
 643int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 644{
 645	if (!device)
 646		return -EINVAL;
 647	return acpi_bus_generate_proc_event4(device->pnp.device_class,
 648					     device->pnp.bus_id, type, data);
 649}
 650
 651EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 652
 653int acpi_bus_receive_event(struct acpi_bus_event *event)
 654{
 655	unsigned long flags = 0;
 656	struct acpi_bus_event *entry = NULL;
 657
 658	DECLARE_WAITQUEUE(wait, current);
 659
 660
 661	if (!event)
 662		return -EINVAL;
 663
 664	if (list_empty(&acpi_bus_event_list)) {
 665
 666		set_current_state(TASK_INTERRUPTIBLE);
 667		add_wait_queue(&acpi_bus_event_queue, &wait);
 668
 669		if (list_empty(&acpi_bus_event_list))
 670			schedule();
 671
 672		remove_wait_queue(&acpi_bus_event_queue, &wait);
 673		set_current_state(TASK_RUNNING);
 674
 675		if (signal_pending(current))
 676			return -ERESTARTSYS;
 677	}
 678
 679	spin_lock_irqsave(&acpi_bus_event_lock, flags);
 680	if (!list_empty(&acpi_bus_event_list)) {
 681		entry = list_entry(acpi_bus_event_list.next,
 682				   struct acpi_bus_event, node);
 683		list_del(&entry->node);
 684	}
 685	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 686
 687	if (!entry)
 688		return -ENODEV;
 689
 690	memcpy(event, entry, sizeof(struct acpi_bus_event));
 691
 692	kfree(entry);
 693
 694	return 0;
 695}
 696
 697#endif	/* CONFIG_ACPI_PROC_EVENT */
 698
 699/* --------------------------------------------------------------------------
 700                             Notification Handling
 701   -------------------------------------------------------------------------- */
 702
 703static void acpi_bus_check_device(acpi_handle handle)
 704{
 705	struct acpi_device *device;
 706	acpi_status status;
 707	struct acpi_device_status old_status;
 708
 709	if (acpi_bus_get_device(handle, &device))
 710		return;
 711	if (!device)
 712		return;
 713
 714	old_status = device->status;
 715
 716	/*
 717	 * Make sure this device's parent is present before we go about
 718	 * messing with the device.
 719	 */
 720	if (device->parent && !device->parent->status.present) {
 721		device->status = device->parent->status;
 722		return;
 723	}
 724
 725	status = acpi_bus_get_status(device);
 726	if (ACPI_FAILURE(status))
 727		return;
 728
 729	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 730		return;
 731
 732	/*
 733	 * Device Insertion/Removal
 734	 */
 735	if ((device->status.present) && !(old_status.present)) {
 736		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 737		/* TBD: Handle device insertion */
 738	} else if (!(device->status.present) && (old_status.present)) {
 739		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 740		/* TBD: Handle device removal */
 741	}
 742}
 743
 744static void acpi_bus_check_scope(acpi_handle handle)
 745{
 746	/* Status Change? */
 747	acpi_bus_check_device(handle);
 748
 749	/*
 750	 * TBD: Enumerate child devices within this device's scope and
 751	 *       run acpi_bus_check_device()'s on them.
 752	 */
 753}
 754
 755static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 756int register_acpi_bus_notifier(struct notifier_block *nb)
 757{
 758	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 759}
 760EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 761
 762void unregister_acpi_bus_notifier(struct notifier_block *nb)
 763{
 764	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 765}
 766EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 767
 768/**
 769 * acpi_bus_notify
 770 * ---------------
 771 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 772 */
 773static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 774{
 775	struct acpi_device *device = NULL;
 776	struct acpi_driver *driver;
 777
 778	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 779			  type, handle));
 780
 781	blocking_notifier_call_chain(&acpi_bus_notify_list,
 782		type, (void *)handle);
 783
 784	switch (type) {
 785
 786	case ACPI_NOTIFY_BUS_CHECK:
 787		acpi_bus_check_scope(handle);
 788		/*
 789		 * TBD: We'll need to outsource certain events to non-ACPI
 790		 *      drivers via the device manager (device.c).
 791		 */
 792		break;
 793
 794	case ACPI_NOTIFY_DEVICE_CHECK:
 795		acpi_bus_check_device(handle);
 796		/*
 797		 * TBD: We'll need to outsource certain events to non-ACPI
 798		 *      drivers via the device manager (device.c).
 799		 */
 800		break;
 801
 802	case ACPI_NOTIFY_DEVICE_WAKE:
 803		/* TBD */
 804		break;
 805
 806	case ACPI_NOTIFY_EJECT_REQUEST:
 807		/* TBD */
 808		break;
 809
 810	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 
 811		/* TBD: Exactly what does 'light' mean? */
 812		break;
 813
 814	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 815		/* TBD */
 
 816		break;
 817
 818	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 819		/* TBD */
 
 820		break;
 821
 822	case ACPI_NOTIFY_POWER_FAULT:
 823		/* TBD */
 824		break;
 825
 826	default:
 827		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 828				  "Received unknown/unsupported notification [%08x]\n",
 829				  type));
 830		break;
 831	}
 832
 833	acpi_bus_get_device(handle, &device);
 834	if (device) {
 835		driver = device->driver;
 836		if (driver && driver->ops.notify &&
 837		    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 838			driver->ops.notify(device, type);
 
 
 
 
 
 
 
 
 
 
 
 
 839	}
 
 
 
 
 
 840}
 841
 842/* --------------------------------------------------------------------------
 843                             Initialization/Cleanup
 844   -------------------------------------------------------------------------- */
 845
 846static int __init acpi_bus_init_irq(void)
 847{
 848	acpi_status status = AE_OK;
 849	union acpi_object arg = { ACPI_TYPE_INTEGER };
 850	struct acpi_object_list arg_list = { 1, &arg };
 851	char *message = NULL;
 852
 853
 854	/*
 855	 * Let the system know what interrupt model we are using by
 856	 * evaluating the \_PIC object, if exists.
 857	 */
 858
 859	switch (acpi_irq_model) {
 860	case ACPI_IRQ_MODEL_PIC:
 861		message = "PIC";
 862		break;
 863	case ACPI_IRQ_MODEL_IOAPIC:
 864		message = "IOAPIC";
 865		break;
 866	case ACPI_IRQ_MODEL_IOSAPIC:
 867		message = "IOSAPIC";
 868		break;
 869	case ACPI_IRQ_MODEL_PLATFORM:
 870		message = "platform specific model";
 871		break;
 872	default:
 873		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 874		return -ENODEV;
 875	}
 876
 877	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 878
 879	arg.integer.value = acpi_irq_model;
 880
 881	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 882	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 883		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 884		return -ENODEV;
 885	}
 886
 887	return 0;
 888}
 889
 890u8 acpi_gbl_permanent_mmap;
 891
 892
 893void __init acpi_early_init(void)
 894{
 895	acpi_status status = AE_OK;
 896
 897	if (acpi_disabled)
 898		return;
 899
 900	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 901
 902	/* enable workarounds, unless strict ACPI spec. compliance */
 903	if (!acpi_strict)
 904		acpi_gbl_enable_interpreter_slack = TRUE;
 905
 906	acpi_gbl_permanent_mmap = 1;
 907
 908	/*
 909	 * If the machine falls into the DMI check table,
 910	 * DSDT will be copied to memory
 911	 */
 912	dmi_check_system(dsdt_dmi_table);
 913
 914	status = acpi_reallocate_root_table();
 915	if (ACPI_FAILURE(status)) {
 916		printk(KERN_ERR PREFIX
 917		       "Unable to reallocate ACPI tables\n");
 918		goto error0;
 919	}
 920
 921	status = acpi_initialize_subsystem();
 922	if (ACPI_FAILURE(status)) {
 923		printk(KERN_ERR PREFIX
 924		       "Unable to initialize the ACPI Interpreter\n");
 925		goto error0;
 926	}
 927
 928	status = acpi_load_tables();
 929	if (ACPI_FAILURE(status)) {
 930		printk(KERN_ERR PREFIX
 931		       "Unable to load the System Description Tables\n");
 932		goto error0;
 933	}
 934
 935#ifdef CONFIG_X86
 936	if (!acpi_ioapic) {
 937		/* compatible (0) means level (3) */
 938		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 939			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 940			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 941		}
 942		/* Set PIC-mode SCI trigger type */
 943		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 944					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 945	} else {
 946		/*
 947		 * now that acpi_gbl_FADT is initialized,
 948		 * update it with result from INT_SRC_OVR parsing
 949		 */
 950		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 951	}
 952#endif
 953
 954	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 955	if (ACPI_FAILURE(status)) {
 956		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 957		goto error0;
 958	}
 959
 
 
 
 
 
 
 
 
 960	return;
 961
 962      error0:
 963	disable_acpi();
 964	return;
 965}
 966
 967static int __init acpi_bus_init(void)
 968{
 969	int result = 0;
 970	acpi_status status = AE_OK;
 971	extern acpi_status acpi_os_initialize1(void);
 972
 973	acpi_os_initialize1();
 974
 975	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 976	if (ACPI_FAILURE(status)) {
 977		printk(KERN_ERR PREFIX
 978		       "Unable to start the ACPI Interpreter\n");
 979		goto error1;
 980	}
 981
 982	/*
 983	 * ACPI 2.0 requires the EC driver to be loaded and work before
 984	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 985	 * is called).
 986	 *
 987	 * This is accomplished by looking for the ECDT table, and getting
 988	 * the EC parameters out of that.
 989	 */
 990	status = acpi_ec_ecdt_probe();
 991	/* Ignore result. Not having an ECDT is not fatal. */
 992
 993	acpi_bus_osc_support();
 994
 995	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 996	if (ACPI_FAILURE(status)) {
 997		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 998		goto error1;
 999	}
 
 
 
 
 
 
1000
1001	/*
1002	 * _PDC control method may load dynamic SSDT tables,
1003	 * and we need to install the table handler before that.
1004	 */
1005	acpi_sysfs_init();
1006
1007	acpi_early_processor_set_pdc();
1008
1009	/*
1010	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1011	 * is necessary to enable it as early as possible.
1012	 */
1013	acpi_boot_ec_enable();
1014
1015	printk(KERN_INFO PREFIX "Interpreter enabled\n");
1016
1017	/* Initialize sleep structures */
1018	acpi_sleep_init();
1019
1020	/*
1021	 * Get the system interrupt model and evaluate \_PIC.
1022	 */
1023	result = acpi_bus_init_irq();
1024	if (result)
1025		goto error1;
1026
1027	/*
1028	 * Register the for all standard device notifications.
1029	 */
1030	status =
1031	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1032					&acpi_bus_notify, NULL);
1033	if (ACPI_FAILURE(status)) {
1034		printk(KERN_ERR PREFIX
1035		       "Unable to register for device notifications\n");
1036		goto error1;
1037	}
1038
1039	/*
1040	 * Create the top ACPI proc directory
1041	 */
1042	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1043
1044	return 0;
1045
1046	/* Mimic structured exception handling */
1047      error1:
1048	acpi_terminate();
1049	return -ENODEV;
1050}
1051
1052struct kobject *acpi_kobj;
1053EXPORT_SYMBOL_GPL(acpi_kobj);
1054
1055static int __init acpi_init(void)
1056{
1057	int result;
1058
1059	if (acpi_disabled) {
1060		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1061		return -ENODEV;
1062	}
1063
1064	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1065	if (!acpi_kobj) {
1066		printk(KERN_WARNING "%s: kset create error\n", __func__);
1067		acpi_kobj = NULL;
1068	}
1069
1070	init_acpi_device_notify();
1071	result = acpi_bus_init();
1072	if (result) {
1073		disable_acpi();
1074		return result;
1075	}
1076
1077	pci_mmcfg_late_init();
1078	acpi_scan_init();
1079	acpi_ec_init();
1080	acpi_debugfs_init();
1081	acpi_sleep_proc_init();
1082	acpi_wakeup_device_init();
1083	return 0;
1084}
1085
1086subsys_initcall(acpi_init);