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#include <linux/regulator/machine.h>
37#ifdef CONFIG_X86
38#include <asm/mpspec.h>
39#endif
40#include <linux/pci.h>
41#include <acpi/apei.h>
42#include <linux/dmi.h>
43#include <linux/suspend.h>
44
45#include "internal.h"
46
47#define _COMPONENT		ACPI_BUS_COMPONENT
48ACPI_MODULE_NAME("bus");
49
50struct acpi_device *acpi_root;
51struct proc_dir_entry *acpi_root_dir;
52EXPORT_SYMBOL(acpi_root_dir);
53
54#ifdef CONFIG_X86
55#ifdef CONFIG_ACPI_CUSTOM_DSDT
56static inline int set_copy_dsdt(const struct dmi_system_id *id)
57{
58	return 0;
59}
60#else
61static int set_copy_dsdt(const struct dmi_system_id *id)
62{
63	printk(KERN_NOTICE "%s detected - "
64		"force copy of DSDT to local memory\n", id->ident);
65	acpi_gbl_copy_dsdt_locally = 1;
66	return 0;
67}
68#endif
69
70static struct dmi_system_id dsdt_dmi_table[] __initdata = {
71	/*
72	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
73	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
74	 */
75	{
76	 .callback = set_copy_dsdt,
77	 .ident = "TOSHIBA Satellite",
78	 .matches = {
79		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
80		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
81		},
82	},
83	{}
84};
85#else
86static struct dmi_system_id dsdt_dmi_table[] __initdata = {
87	{}
88};
89#endif
90
91/* --------------------------------------------------------------------------
92                                Device Management
93   -------------------------------------------------------------------------- */
94
95acpi_status acpi_bus_get_status_handle(acpi_handle handle,
96				       unsigned long long *sta)
97{
98	acpi_status status;
99
100	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
101	if (ACPI_SUCCESS(status))
102		return AE_OK;
103
104	if (status == AE_NOT_FOUND) {
105		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
106		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
107		return AE_OK;
108	}
109	return status;
110}
111
112int acpi_bus_get_status(struct acpi_device *device)
113{
114	acpi_status status;
115	unsigned long long sta;
116
117	status = acpi_bus_get_status_handle(device->handle, &sta);
118	if (ACPI_FAILURE(status))
119		return -ENODEV;
120
121	acpi_set_device_status(device, sta);
122
123	if (device->status.functional && !device->status.present) {
124		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
125		       "functional but not present;\n",
126			device->pnp.bus_id, (u32)sta));
127	}
128
129	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
130			  device->pnp.bus_id, (u32)sta));
131	return 0;
132}
133EXPORT_SYMBOL(acpi_bus_get_status);
134
135void acpi_bus_private_data_handler(acpi_handle handle,
136				   void *context)
137{
138	return;
139}
140EXPORT_SYMBOL(acpi_bus_private_data_handler);
141
142int acpi_bus_attach_private_data(acpi_handle handle, void *data)
143{
144	acpi_status status;
145
146	status = acpi_attach_data(handle,
147			acpi_bus_private_data_handler, data);
148	if (ACPI_FAILURE(status)) {
149		acpi_handle_debug(handle, "Error attaching device data\n");
150		return -ENODEV;
151	}
152
153	return 0;
154}
155EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
156
157int acpi_bus_get_private_data(acpi_handle handle, void **data)
158{
159	acpi_status status;
160
161	if (!*data)
162		return -EINVAL;
163
164	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
165	if (ACPI_FAILURE(status)) {
166		acpi_handle_debug(handle, "No context for object\n");
167		return -ENODEV;
168	}
169
170	return 0;
171}
172EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
173
174void acpi_bus_detach_private_data(acpi_handle handle)
175{
176	acpi_detach_data(handle, acpi_bus_private_data_handler);
177}
178EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
179
180static void acpi_print_osc_error(acpi_handle handle,
181	struct acpi_osc_context *context, char *error)
182{
183	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
184	int i;
185
186	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
187		printk(KERN_DEBUG "%s\n", error);
188	else {
189		printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
190		kfree(buffer.pointer);
191	}
192	printk(KERN_DEBUG"_OSC request data:");
193	for (i = 0; i < context->cap.length; i += sizeof(u32))
194		printk("%x ", *((u32 *)(context->cap.pointer + i)));
195	printk("\n");
196}
197
198acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
199{
200	int i;
201	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
202		24, 26, 28, 30, 32, 34};
203
204	if (strlen(str) != 36)
205		return AE_BAD_PARAMETER;
206	for (i = 0; i < 36; i++) {
207		if (i == 8 || i == 13 || i == 18 || i == 23) {
208			if (str[i] != '-')
209				return AE_BAD_PARAMETER;
210		} else if (!isxdigit(str[i]))
211			return AE_BAD_PARAMETER;
212	}
213	for (i = 0; i < 16; i++) {
214		uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
215		uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
216	}
217	return AE_OK;
218}
219EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
220
221acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
222{
223	acpi_status status;
224	struct acpi_object_list input;
225	union acpi_object in_params[4];
226	union acpi_object *out_obj;
227	u8 uuid[16];
228	u32 errors;
229	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
230
231	if (!context)
232		return AE_ERROR;
233	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
234		return AE_ERROR;
235	context->ret.length = ACPI_ALLOCATE_BUFFER;
236	context->ret.pointer = NULL;
237
238	/* Setting up input parameters */
239	input.count = 4;
240	input.pointer = in_params;
241	in_params[0].type 		= ACPI_TYPE_BUFFER;
242	in_params[0].buffer.length 	= 16;
243	in_params[0].buffer.pointer	= uuid;
244	in_params[1].type 		= ACPI_TYPE_INTEGER;
245	in_params[1].integer.value 	= context->rev;
246	in_params[2].type 		= ACPI_TYPE_INTEGER;
247	in_params[2].integer.value	= context->cap.length/sizeof(u32);
248	in_params[3].type		= ACPI_TYPE_BUFFER;
249	in_params[3].buffer.length 	= context->cap.length;
250	in_params[3].buffer.pointer 	= context->cap.pointer;
251
252	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
253	if (ACPI_FAILURE(status))
254		return status;
255
256	if (!output.length)
257		return AE_NULL_OBJECT;
258
259	out_obj = output.pointer;
260	if (out_obj->type != ACPI_TYPE_BUFFER
261		|| out_obj->buffer.length != context->cap.length) {
262		acpi_print_osc_error(handle, context,
263			"_OSC evaluation returned wrong type");
264		status = AE_TYPE;
265		goto out_kfree;
266	}
267	/* Need to ignore the bit0 in result code */
268	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
269	if (errors) {
270		if (errors & OSC_REQUEST_ERROR)
271			acpi_print_osc_error(handle, context,
272				"_OSC request failed");
273		if (errors & OSC_INVALID_UUID_ERROR)
274			acpi_print_osc_error(handle, context,
275				"_OSC invalid UUID");
276		if (errors & OSC_INVALID_REVISION_ERROR)
277			acpi_print_osc_error(handle, context,
278				"_OSC invalid revision");
279		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
280			if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
281			    & OSC_QUERY_ENABLE)
282				goto out_success;
283			status = AE_SUPPORT;
284			goto out_kfree;
285		}
286		status = AE_ERROR;
287		goto out_kfree;
288	}
289out_success:
290	context->ret.length = out_obj->buffer.length;
291	context->ret.pointer = kmemdup(out_obj->buffer.pointer,
292				       context->ret.length, GFP_KERNEL);
293	if (!context->ret.pointer) {
294		status =  AE_NO_MEMORY;
295		goto out_kfree;
296	}
297	status =  AE_OK;
298
299out_kfree:
300	kfree(output.pointer);
301	if (status != AE_OK)
302		context->ret.pointer = NULL;
303	return status;
304}
305EXPORT_SYMBOL(acpi_run_osc);
306
307bool osc_sb_apei_support_acked;
308static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
309static void acpi_bus_osc_support(void)
310{
311	u32 capbuf[2];
312	struct acpi_osc_context context = {
313		.uuid_str = sb_uuid_str,
314		.rev = 1,
315		.cap.length = 8,
316		.cap.pointer = capbuf,
317	};
318	acpi_handle handle;
319
320	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
321	capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
322#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
323			defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
324	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
325#endif
326
327#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
328	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
329#endif
330
331	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
332
333	if (!ghes_disable)
334		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
335	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
336		return;
337	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
338		u32 *capbuf_ret = context.ret.pointer;
339		if (context.ret.length > OSC_SUPPORT_DWORD)
340			osc_sb_apei_support_acked =
341				capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
342		kfree(context.ret.pointer);
343	}
344	/* do we need to check other returned cap? Sounds no */
345}
346
347/* --------------------------------------------------------------------------
348                             Notification Handling
349   -------------------------------------------------------------------------- */
350
351/**
352 * acpi_bus_notify
353 * ---------------
354 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
355 */
356static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
357{
358	struct acpi_device *adev;
359	struct acpi_driver *driver;
360	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
361	bool hotplug_event = false;
362
363	switch (type) {
364	case ACPI_NOTIFY_BUS_CHECK:
365		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
366		hotplug_event = true;
367		break;
368
369	case ACPI_NOTIFY_DEVICE_CHECK:
370		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
371		hotplug_event = true;
372		break;
373
374	case ACPI_NOTIFY_DEVICE_WAKE:
375		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
376		break;
377
378	case ACPI_NOTIFY_EJECT_REQUEST:
379		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
380		hotplug_event = true;
381		break;
382
383	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
384		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
385		/* TBD: Exactly what does 'light' mean? */
386		break;
387
388	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
389		acpi_handle_err(handle, "Device cannot be configured due "
390				"to a frequency mismatch\n");
391		break;
392
393	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
394		acpi_handle_err(handle, "Device cannot be configured due "
395				"to a bus mode mismatch\n");
396		break;
397
398	case ACPI_NOTIFY_POWER_FAULT:
399		acpi_handle_err(handle, "Device has suffered a power fault\n");
400		break;
401
402	default:
403		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
404		break;
405	}
406
407	adev = acpi_bus_get_acpi_device(handle);
408	if (!adev)
409		goto err;
410
411	driver = adev->driver;
412	if (driver && driver->ops.notify &&
413	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
414		driver->ops.notify(adev, type);
415
416	if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
417		return;
418
419	acpi_bus_put_acpi_device(adev);
420	return;
421
422 err:
423	acpi_evaluate_ost(handle, type, ost_code, NULL);
424}
425
426/* --------------------------------------------------------------------------
427                             Initialization/Cleanup
428   -------------------------------------------------------------------------- */
429
430static int __init acpi_bus_init_irq(void)
431{
432	acpi_status status;
433	char *message = NULL;
434
435
436	/*
437	 * Let the system know what interrupt model we are using by
438	 * evaluating the \_PIC object, if exists.
439	 */
440
441	switch (acpi_irq_model) {
442	case ACPI_IRQ_MODEL_PIC:
443		message = "PIC";
444		break;
445	case ACPI_IRQ_MODEL_IOAPIC:
446		message = "IOAPIC";
447		break;
448	case ACPI_IRQ_MODEL_IOSAPIC:
449		message = "IOSAPIC";
450		break;
451	case ACPI_IRQ_MODEL_GIC:
452		message = "GIC";
453		break;
454	case ACPI_IRQ_MODEL_PLATFORM:
455		message = "platform specific model";
456		break;
457	default:
458		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
459		return -ENODEV;
460	}
461
462	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
463
464	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
465	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
466		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
467		return -ENODEV;
468	}
469
470	return 0;
471}
472
473/**
474 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
475 *
476 * The ACPI tables are accessible after this, but the handling of events has not
477 * been initialized and the global lock is not available yet, so AML should not
478 * be executed at this point.
479 *
480 * Doing this before switching the EFI runtime services to virtual mode allows
481 * the EfiBootServices memory to be freed slightly earlier on boot.
482 */
483void __init acpi_early_init(void)
484{
485	acpi_status status;
486
487	if (acpi_disabled)
488		return;
489
490	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
491
492	/* It's safe to verify table checksums during late stage */
493	acpi_gbl_verify_table_checksum = TRUE;
494
495	/* enable workarounds, unless strict ACPI spec. compliance */
496	if (!acpi_strict)
497		acpi_gbl_enable_interpreter_slack = TRUE;
498
499	acpi_gbl_permanent_mmap = 1;
500
501	/*
502	 * If the machine falls into the DMI check table,
503	 * DSDT will be copied to memory
504	 */
505	dmi_check_system(dsdt_dmi_table);
506
507	status = acpi_reallocate_root_table();
508	if (ACPI_FAILURE(status)) {
509		printk(KERN_ERR PREFIX
510		       "Unable to reallocate ACPI tables\n");
511		goto error0;
512	}
513
514	status = acpi_initialize_subsystem();
515	if (ACPI_FAILURE(status)) {
516		printk(KERN_ERR PREFIX
517		       "Unable to initialize the ACPI Interpreter\n");
518		goto error0;
519	}
520
521	status = acpi_load_tables();
522	if (ACPI_FAILURE(status)) {
523		printk(KERN_ERR PREFIX
524		       "Unable to load the System Description Tables\n");
525		goto error0;
526	}
527
528#ifdef CONFIG_X86
529	if (!acpi_ioapic) {
530		/* compatible (0) means level (3) */
531		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
532			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
533			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
534		}
535		/* Set PIC-mode SCI trigger type */
536		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
537					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
538	} else {
539		/*
540		 * now that acpi_gbl_FADT is initialized,
541		 * update it with result from INT_SRC_OVR parsing
542		 */
543		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
544	}
545#endif
546	return;
547
548 error0:
549	disable_acpi();
550}
551
552/**
553 * acpi_subsystem_init - Finalize the early initialization of ACPI.
554 *
555 * Switch over the platform to the ACPI mode (if possible), initialize the
556 * handling of ACPI events, install the interrupt and global lock handlers.
557 *
558 * Doing this too early is generally unsafe, but at the same time it needs to be
559 * done before all things that really depend on ACPI.  The right spot appears to
560 * be before finalizing the EFI initialization.
561 */
562void __init acpi_subsystem_init(void)
563{
564	acpi_status status;
565
566	if (acpi_disabled)
567		return;
568
569	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
570	if (ACPI_FAILURE(status)) {
571		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
572		disable_acpi();
573	} else {
574		/*
575		 * If the system is using ACPI then we can be reasonably
576		 * confident that any regulators are managed by the firmware
577		 * so tell the regulator core it has everything it needs to
578		 * know.
579		 */
580		regulator_has_full_constraints();
581	}
582}
583
584static int __init acpi_bus_init(void)
585{
586	int result;
587	acpi_status status;
588
589	acpi_os_initialize1();
590
591	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
592	if (ACPI_FAILURE(status)) {
593		printk(KERN_ERR PREFIX
594		       "Unable to start the ACPI Interpreter\n");
595		goto error1;
596	}
597
598	/*
599	 * ACPI 2.0 requires the EC driver to be loaded and work before
600	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
601	 * is called).
602	 *
603	 * This is accomplished by looking for the ECDT table, and getting
604	 * the EC parameters out of that.
605	 */
606	status = acpi_ec_ecdt_probe();
607	/* Ignore result. Not having an ECDT is not fatal. */
608
609	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
610	if (ACPI_FAILURE(status)) {
611		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
612		goto error1;
613	}
614
615	/*
616	 * _OSC method may exist in module level code,
617	 * so it must be run after ACPI_FULL_INITIALIZATION
618	 */
619	acpi_bus_osc_support();
620
621	/*
622	 * _PDC control method may load dynamic SSDT tables,
623	 * and we need to install the table handler before that.
624	 */
625	acpi_sysfs_init();
626
627	acpi_early_processor_set_pdc();
628
629	/*
630	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
631	 * is necessary to enable it as early as possible.
632	 */
633	acpi_boot_ec_enable();
634
635	printk(KERN_INFO PREFIX "Interpreter enabled\n");
636
637	/* Initialize sleep structures */
638	acpi_sleep_init();
639
640	/*
641	 * Get the system interrupt model and evaluate \_PIC.
642	 */
643	result = acpi_bus_init_irq();
644	if (result)
645		goto error1;
646
647	/*
648	 * Register the for all standard device notifications.
649	 */
650	status =
651	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
652					&acpi_bus_notify, NULL);
653	if (ACPI_FAILURE(status)) {
654		printk(KERN_ERR PREFIX
655		       "Unable to register for device notifications\n");
656		goto error1;
657	}
658
659	/*
660	 * Create the top ACPI proc directory
661	 */
662	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
663
664	return 0;
665
666	/* Mimic structured exception handling */
667      error1:
668	acpi_terminate();
669	return -ENODEV;
670}
671
672struct kobject *acpi_kobj;
673EXPORT_SYMBOL_GPL(acpi_kobj);
674
675static int __init acpi_init(void)
676{
677	int result;
678
679	if (acpi_disabled) {
680		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
681		return -ENODEV;
682	}
683
684	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
685	if (!acpi_kobj) {
686		printk(KERN_WARNING "%s: kset create error\n", __func__);
687		acpi_kobj = NULL;
688	}
689
690	init_acpi_device_notify();
691	result = acpi_bus_init();
692	if (result) {
693		disable_acpi();
694		return result;
695	}
696
697	pci_mmcfg_late_init();
698	acpi_scan_init();
699	acpi_ec_init();
700	acpi_debugfs_init();
701	acpi_sleep_proc_init();
702	acpi_wakeup_device_init();
703	return 0;
704}
705
706subsys_initcall(acpi_init);
707