xref: /linux/drivers/acpi/bus.c (revision 9dbbc3b9d09d6deba9f3b9e1d5b355032ed46a75)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
4  *
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  */
7 
8 #define pr_fmt(fmt) "ACPI: " fmt
9 
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/ioport.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/sched.h>
16 #include <linux/pm.h>
17 #include <linux/device.h>
18 #include <linux/proc_fs.h>
19 #include <linux/acpi.h>
20 #include <linux/slab.h>
21 #include <linux/regulator/machine.h>
22 #include <linux/workqueue.h>
23 #include <linux/reboot.h>
24 #include <linux/delay.h>
25 #ifdef CONFIG_X86
26 #include <asm/mpspec.h>
27 #include <linux/dmi.h>
28 #endif
29 #include <linux/acpi_iort.h>
30 #include <linux/acpi_viot.h>
31 #include <linux/pci.h>
32 #include <acpi/apei.h>
33 #include <linux/suspend.h>
34 #include <linux/prmt.h>
35 
36 #include "internal.h"
37 
38 struct acpi_device *acpi_root;
39 struct proc_dir_entry *acpi_root_dir;
40 EXPORT_SYMBOL(acpi_root_dir);
41 
42 #ifdef CONFIG_X86
43 #ifdef CONFIG_ACPI_CUSTOM_DSDT
44 static inline int set_copy_dsdt(const struct dmi_system_id *id)
45 {
46 	return 0;
47 }
48 #else
49 static int set_copy_dsdt(const struct dmi_system_id *id)
50 {
51 	pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
52 	acpi_gbl_copy_dsdt_locally = 1;
53 	return 0;
54 }
55 #endif
56 
57 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
58 	/*
59 	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
60 	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
61 	 */
62 	{
63 	 .callback = set_copy_dsdt,
64 	 .ident = "TOSHIBA Satellite",
65 	 .matches = {
66 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
67 		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
68 		},
69 	},
70 	{}
71 };
72 #endif
73 
74 /* --------------------------------------------------------------------------
75                                 Device Management
76    -------------------------------------------------------------------------- */
77 
78 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
79 				       unsigned long long *sta)
80 {
81 	acpi_status status;
82 
83 	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
84 	if (ACPI_SUCCESS(status))
85 		return AE_OK;
86 
87 	if (status == AE_NOT_FOUND) {
88 		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
89 		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
90 		return AE_OK;
91 	}
92 	return status;
93 }
94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
95 
96 int acpi_bus_get_status(struct acpi_device *device)
97 {
98 	acpi_status status;
99 	unsigned long long sta;
100 
101 	if (acpi_device_always_present(device)) {
102 		acpi_set_device_status(device, ACPI_STA_DEFAULT);
103 		return 0;
104 	}
105 
106 	/* Battery devices must have their deps met before calling _STA */
107 	if (acpi_device_is_battery(device) && device->dep_unmet) {
108 		acpi_set_device_status(device, 0);
109 		return 0;
110 	}
111 
112 	status = acpi_bus_get_status_handle(device->handle, &sta);
113 	if (ACPI_FAILURE(status))
114 		return -ENODEV;
115 
116 	acpi_set_device_status(device, sta);
117 
118 	if (device->status.functional && !device->status.present) {
119 		pr_debug("Device [%s] status [%08x]: functional but not present\n",
120 			 device->pnp.bus_id, (u32)sta);
121 	}
122 
123 	pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
124 	return 0;
125 }
126 EXPORT_SYMBOL(acpi_bus_get_status);
127 
128 void acpi_bus_private_data_handler(acpi_handle handle,
129 				   void *context)
130 {
131 	return;
132 }
133 EXPORT_SYMBOL(acpi_bus_private_data_handler);
134 
135 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
136 {
137 	acpi_status status;
138 
139 	status = acpi_attach_data(handle,
140 			acpi_bus_private_data_handler, data);
141 	if (ACPI_FAILURE(status)) {
142 		acpi_handle_debug(handle, "Error attaching device data\n");
143 		return -ENODEV;
144 	}
145 
146 	return 0;
147 }
148 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
149 
150 int acpi_bus_get_private_data(acpi_handle handle, void **data)
151 {
152 	acpi_status status;
153 
154 	if (!data)
155 		return -EINVAL;
156 
157 	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
158 	if (ACPI_FAILURE(status)) {
159 		acpi_handle_debug(handle, "No context for object\n");
160 		return -ENODEV;
161 	}
162 
163 	return 0;
164 }
165 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
166 
167 void acpi_bus_detach_private_data(acpi_handle handle)
168 {
169 	acpi_detach_data(handle, acpi_bus_private_data_handler);
170 }
171 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
172 
173 static void acpi_print_osc_error(acpi_handle handle,
174 				 struct acpi_osc_context *context, char *error)
175 {
176 	int i;
177 
178 	acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
179 
180 	pr_debug("_OSC request data:");
181 	for (i = 0; i < context->cap.length; i += sizeof(u32))
182 		pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
183 
184 	pr_debug("\n");
185 }
186 
187 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
188 {
189 	acpi_status status;
190 	struct acpi_object_list input;
191 	union acpi_object in_params[4];
192 	union acpi_object *out_obj;
193 	guid_t guid;
194 	u32 errors;
195 	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
196 
197 	if (!context)
198 		return AE_ERROR;
199 	if (guid_parse(context->uuid_str, &guid))
200 		return AE_ERROR;
201 	context->ret.length = ACPI_ALLOCATE_BUFFER;
202 	context->ret.pointer = NULL;
203 
204 	/* Setting up input parameters */
205 	input.count = 4;
206 	input.pointer = in_params;
207 	in_params[0].type 		= ACPI_TYPE_BUFFER;
208 	in_params[0].buffer.length 	= 16;
209 	in_params[0].buffer.pointer	= (u8 *)&guid;
210 	in_params[1].type 		= ACPI_TYPE_INTEGER;
211 	in_params[1].integer.value 	= context->rev;
212 	in_params[2].type 		= ACPI_TYPE_INTEGER;
213 	in_params[2].integer.value	= context->cap.length/sizeof(u32);
214 	in_params[3].type		= ACPI_TYPE_BUFFER;
215 	in_params[3].buffer.length 	= context->cap.length;
216 	in_params[3].buffer.pointer 	= context->cap.pointer;
217 
218 	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
219 	if (ACPI_FAILURE(status))
220 		return status;
221 
222 	if (!output.length)
223 		return AE_NULL_OBJECT;
224 
225 	out_obj = output.pointer;
226 	if (out_obj->type != ACPI_TYPE_BUFFER
227 		|| out_obj->buffer.length != context->cap.length) {
228 		acpi_print_osc_error(handle, context,
229 			"_OSC evaluation returned wrong type");
230 		status = AE_TYPE;
231 		goto out_kfree;
232 	}
233 	/* Need to ignore the bit0 in result code */
234 	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
235 	if (errors) {
236 		if (errors & OSC_REQUEST_ERROR)
237 			acpi_print_osc_error(handle, context,
238 				"_OSC request failed");
239 		if (errors & OSC_INVALID_UUID_ERROR)
240 			acpi_print_osc_error(handle, context,
241 				"_OSC invalid UUID");
242 		if (errors & OSC_INVALID_REVISION_ERROR)
243 			acpi_print_osc_error(handle, context,
244 				"_OSC invalid revision");
245 		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
246 			if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
247 			    & OSC_QUERY_ENABLE)
248 				goto out_success;
249 			status = AE_SUPPORT;
250 			goto out_kfree;
251 		}
252 		status = AE_ERROR;
253 		goto out_kfree;
254 	}
255 out_success:
256 	context->ret.length = out_obj->buffer.length;
257 	context->ret.pointer = kmemdup(out_obj->buffer.pointer,
258 				       context->ret.length, GFP_KERNEL);
259 	if (!context->ret.pointer) {
260 		status =  AE_NO_MEMORY;
261 		goto out_kfree;
262 	}
263 	status =  AE_OK;
264 
265 out_kfree:
266 	kfree(output.pointer);
267 	return status;
268 }
269 EXPORT_SYMBOL(acpi_run_osc);
270 
271 bool osc_sb_apei_support_acked;
272 
273 /*
274  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
275  * OSPM supports platform coordinated low power idle(LPI) states
276  */
277 bool osc_pc_lpi_support_confirmed;
278 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
279 
280 /*
281  * ACPI 6.4 Operating System Capabilities for USB.
282  */
283 bool osc_sb_native_usb4_support_confirmed;
284 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
285 
286 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
287 static void acpi_bus_osc_negotiate_platform_control(void)
288 {
289 	u32 capbuf[2], *capbuf_ret;
290 	struct acpi_osc_context context = {
291 		.uuid_str = sb_uuid_str,
292 		.rev = 1,
293 		.cap.length = 8,
294 		.cap.pointer = capbuf,
295 	};
296 	acpi_handle handle;
297 
298 	capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
299 	capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
300 	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
301 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
302 	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
303 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
304 
305 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
306 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
307 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
308 
309 #ifdef CONFIG_ARM64
310 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
311 #endif
312 #ifdef CONFIG_X86
313 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
314 	if (boot_cpu_has(X86_FEATURE_HWP)) {
315 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
316 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
317 	}
318 #endif
319 
320 	if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
321 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
322 
323 	if (IS_ENABLED(CONFIG_USB4))
324 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
325 
326 	if (!ghes_disable)
327 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
328 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
329 		return;
330 
331 	if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
332 		return;
333 
334 	kfree(context.ret.pointer);
335 
336 	/* Now run _OSC again with query flag clear */
337 	capbuf[OSC_QUERY_DWORD] = 0;
338 
339 	if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
340 		return;
341 
342 	capbuf_ret = context.ret.pointer;
343 	osc_sb_apei_support_acked =
344 		capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
345 	osc_pc_lpi_support_confirmed =
346 		capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
347 	osc_sb_native_usb4_support_confirmed =
348 		capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
349 
350 	kfree(context.ret.pointer);
351 }
352 
353 /*
354  * Native control of USB4 capabilities. If any of the tunneling bits is
355  * set it means OS is in control and we use software based connection
356  * manager.
357  */
358 u32 osc_sb_native_usb4_control;
359 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
360 
361 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
362 {
363 	pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
364 	       (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
365 	       (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
366 	       (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
367 	       (bits & OSC_USB_XDOMAIN) ? '+' : '-');
368 }
369 
370 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
371 static void acpi_bus_osc_negotiate_usb_control(void)
372 {
373 	u32 capbuf[3];
374 	struct acpi_osc_context context = {
375 		.uuid_str = sb_usb_uuid_str,
376 		.rev = 1,
377 		.cap.length = sizeof(capbuf),
378 		.cap.pointer = capbuf,
379 	};
380 	acpi_handle handle;
381 	acpi_status status;
382 	u32 control;
383 
384 	if (!osc_sb_native_usb4_support_confirmed)
385 		return;
386 
387 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
388 		return;
389 
390 	control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
391 		  OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
392 
393 	capbuf[OSC_QUERY_DWORD] = 0;
394 	capbuf[OSC_SUPPORT_DWORD] = 0;
395 	capbuf[OSC_CONTROL_DWORD] = control;
396 
397 	status = acpi_run_osc(handle, &context);
398 	if (ACPI_FAILURE(status))
399 		return;
400 
401 	if (context.ret.length != sizeof(capbuf)) {
402 		pr_info("USB4 _OSC: returned invalid length buffer\n");
403 		goto out_free;
404 	}
405 
406 	osc_sb_native_usb4_control =
407 		control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
408 
409 	acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
410 	acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
411 				osc_sb_native_usb4_control);
412 
413 out_free:
414 	kfree(context.ret.pointer);
415 }
416 
417 /* --------------------------------------------------------------------------
418                              Notification Handling
419    -------------------------------------------------------------------------- */
420 
421 /**
422  * acpi_bus_notify
423  * ---------------
424  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
425  */
426 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
427 {
428 	struct acpi_device *adev;
429 	struct acpi_driver *driver;
430 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
431 	bool hotplug_event = false;
432 
433 	switch (type) {
434 	case ACPI_NOTIFY_BUS_CHECK:
435 		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
436 		hotplug_event = true;
437 		break;
438 
439 	case ACPI_NOTIFY_DEVICE_CHECK:
440 		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
441 		hotplug_event = true;
442 		break;
443 
444 	case ACPI_NOTIFY_DEVICE_WAKE:
445 		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
446 		break;
447 
448 	case ACPI_NOTIFY_EJECT_REQUEST:
449 		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
450 		hotplug_event = true;
451 		break;
452 
453 	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
454 		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
455 		/* TBD: Exactly what does 'light' mean? */
456 		break;
457 
458 	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
459 		acpi_handle_err(handle, "Device cannot be configured due "
460 				"to a frequency mismatch\n");
461 		break;
462 
463 	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
464 		acpi_handle_err(handle, "Device cannot be configured due "
465 				"to a bus mode mismatch\n");
466 		break;
467 
468 	case ACPI_NOTIFY_POWER_FAULT:
469 		acpi_handle_err(handle, "Device has suffered a power fault\n");
470 		break;
471 
472 	default:
473 		acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
474 		break;
475 	}
476 
477 	adev = acpi_bus_get_acpi_device(handle);
478 	if (!adev)
479 		goto err;
480 
481 	driver = adev->driver;
482 	if (driver && driver->ops.notify &&
483 	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
484 		driver->ops.notify(adev, type);
485 
486 	if (!hotplug_event) {
487 		acpi_bus_put_acpi_device(adev);
488 		return;
489 	}
490 
491 	if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
492 		return;
493 
494 	acpi_bus_put_acpi_device(adev);
495 
496  err:
497 	acpi_evaluate_ost(handle, type, ost_code, NULL);
498 }
499 
500 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
501 {
502 	struct acpi_device *device = data;
503 
504 	device->driver->ops.notify(device, event);
505 }
506 
507 static void acpi_device_notify_fixed(void *data)
508 {
509 	struct acpi_device *device = data;
510 
511 	/* Fixed hardware devices have no handles */
512 	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
513 }
514 
515 static u32 acpi_device_fixed_event(void *data)
516 {
517 	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
518 	return ACPI_INTERRUPT_HANDLED;
519 }
520 
521 static int acpi_device_install_notify_handler(struct acpi_device *device)
522 {
523 	acpi_status status;
524 
525 	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
526 		status =
527 		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
528 						     acpi_device_fixed_event,
529 						     device);
530 	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
531 		status =
532 		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
533 						     acpi_device_fixed_event,
534 						     device);
535 	else
536 		status = acpi_install_notify_handler(device->handle,
537 						     ACPI_DEVICE_NOTIFY,
538 						     acpi_device_notify,
539 						     device);
540 
541 	if (ACPI_FAILURE(status))
542 		return -EINVAL;
543 	return 0;
544 }
545 
546 static void acpi_device_remove_notify_handler(struct acpi_device *device)
547 {
548 	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
549 		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
550 						acpi_device_fixed_event);
551 	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
552 		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
553 						acpi_device_fixed_event);
554 	else
555 		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
556 					   acpi_device_notify);
557 }
558 
559 /* Handle events targeting \_SB device (at present only graceful shutdown) */
560 
561 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
562 #define ACPI_SB_INDICATE_INTERVAL	10000
563 
564 static void sb_notify_work(struct work_struct *dummy)
565 {
566 	acpi_handle sb_handle;
567 
568 	orderly_poweroff(true);
569 
570 	/*
571 	 * After initiating graceful shutdown, the ACPI spec requires OSPM
572 	 * to evaluate _OST method once every 10seconds to indicate that
573 	 * the shutdown is in progress
574 	 */
575 	acpi_get_handle(NULL, "\\_SB", &sb_handle);
576 	while (1) {
577 		pr_info("Graceful shutdown in progress.\n");
578 		acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
579 				ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
580 		msleep(ACPI_SB_INDICATE_INTERVAL);
581 	}
582 }
583 
584 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
585 {
586 	static DECLARE_WORK(acpi_sb_work, sb_notify_work);
587 
588 	if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
589 		if (!work_busy(&acpi_sb_work))
590 			schedule_work(&acpi_sb_work);
591 	} else
592 		pr_warn("event %x is not supported by \\_SB device\n", event);
593 }
594 
595 static int __init acpi_setup_sb_notify_handler(void)
596 {
597 	acpi_handle sb_handle;
598 
599 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
600 		return -ENXIO;
601 
602 	if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
603 						acpi_sb_notify, NULL)))
604 		return -EINVAL;
605 
606 	return 0;
607 }
608 
609 /* --------------------------------------------------------------------------
610                              Device Matching
611    -------------------------------------------------------------------------- */
612 
613 /**
614  * acpi_get_first_physical_node - Get first physical node of an ACPI device
615  * @adev:	ACPI device in question
616  *
617  * Return: First physical node of ACPI device @adev
618  */
619 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
620 {
621 	struct mutex *physical_node_lock = &adev->physical_node_lock;
622 	struct device *phys_dev;
623 
624 	mutex_lock(physical_node_lock);
625 	if (list_empty(&adev->physical_node_list)) {
626 		phys_dev = NULL;
627 	} else {
628 		const struct acpi_device_physical_node *node;
629 
630 		node = list_first_entry(&adev->physical_node_list,
631 					struct acpi_device_physical_node, node);
632 
633 		phys_dev = node->dev;
634 	}
635 	mutex_unlock(physical_node_lock);
636 	return phys_dev;
637 }
638 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
639 
640 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
641 						      const struct device *dev)
642 {
643 	const struct device *phys_dev = acpi_get_first_physical_node(adev);
644 
645 	return phys_dev && phys_dev == dev ? adev : NULL;
646 }
647 
648 /**
649  * acpi_device_is_first_physical_node - Is given dev first physical node
650  * @adev: ACPI companion device
651  * @dev: Physical device to check
652  *
653  * Function checks if given @dev is the first physical devices attached to
654  * the ACPI companion device. This distinction is needed in some cases
655  * where the same companion device is shared between many physical devices.
656  *
657  * Note that the caller have to provide valid @adev pointer.
658  */
659 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
660 					const struct device *dev)
661 {
662 	return !!acpi_primary_dev_companion(adev, dev);
663 }
664 
665 /*
666  * acpi_companion_match() - Can we match via ACPI companion device
667  * @dev: Device in question
668  *
669  * Check if the given device has an ACPI companion and if that companion has
670  * a valid list of PNP IDs, and if the device is the first (primary) physical
671  * device associated with it.  Return the companion pointer if that's the case
672  * or NULL otherwise.
673  *
674  * If multiple physical devices are attached to a single ACPI companion, we need
675  * to be careful.  The usage scenario for this kind of relationship is that all
676  * of the physical devices in question use resources provided by the ACPI
677  * companion.  A typical case is an MFD device where all the sub-devices share
678  * the parent's ACPI companion.  In such cases we can only allow the primary
679  * (first) physical device to be matched with the help of the companion's PNP
680  * IDs.
681  *
682  * Additional physical devices sharing the ACPI companion can still use
683  * resources available from it but they will be matched normally using functions
684  * provided by their bus types (and analogously for their modalias).
685  */
686 struct acpi_device *acpi_companion_match(const struct device *dev)
687 {
688 	struct acpi_device *adev;
689 
690 	adev = ACPI_COMPANION(dev);
691 	if (!adev)
692 		return NULL;
693 
694 	if (list_empty(&adev->pnp.ids))
695 		return NULL;
696 
697 	return acpi_primary_dev_companion(adev, dev);
698 }
699 
700 /**
701  * acpi_of_match_device - Match device object using the "compatible" property.
702  * @adev: ACPI device object to match.
703  * @of_match_table: List of device IDs to match against.
704  * @of_id: OF ID if matched
705  *
706  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
707  * identifiers and a _DSD object with the "compatible" property, use that
708  * property to match against the given list of identifiers.
709  */
710 static bool acpi_of_match_device(struct acpi_device *adev,
711 				 const struct of_device_id *of_match_table,
712 				 const struct of_device_id **of_id)
713 {
714 	const union acpi_object *of_compatible, *obj;
715 	int i, nval;
716 
717 	if (!adev)
718 		return false;
719 
720 	of_compatible = adev->data.of_compatible;
721 	if (!of_match_table || !of_compatible)
722 		return false;
723 
724 	if (of_compatible->type == ACPI_TYPE_PACKAGE) {
725 		nval = of_compatible->package.count;
726 		obj = of_compatible->package.elements;
727 	} else { /* Must be ACPI_TYPE_STRING. */
728 		nval = 1;
729 		obj = of_compatible;
730 	}
731 	/* Now we can look for the driver DT compatible strings */
732 	for (i = 0; i < nval; i++, obj++) {
733 		const struct of_device_id *id;
734 
735 		for (id = of_match_table; id->compatible[0]; id++)
736 			if (!strcasecmp(obj->string.pointer, id->compatible)) {
737 				if (of_id)
738 					*of_id = id;
739 				return true;
740 			}
741 	}
742 
743 	return false;
744 }
745 
746 static bool acpi_of_modalias(struct acpi_device *adev,
747 			     char *modalias, size_t len)
748 {
749 	const union acpi_object *of_compatible;
750 	const union acpi_object *obj;
751 	const char *str, *chr;
752 
753 	of_compatible = adev->data.of_compatible;
754 	if (!of_compatible)
755 		return false;
756 
757 	if (of_compatible->type == ACPI_TYPE_PACKAGE)
758 		obj = of_compatible->package.elements;
759 	else /* Must be ACPI_TYPE_STRING. */
760 		obj = of_compatible;
761 
762 	str = obj->string.pointer;
763 	chr = strchr(str, ',');
764 	strlcpy(modalias, chr ? chr + 1 : str, len);
765 
766 	return true;
767 }
768 
769 /**
770  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
771  * @adev:	ACPI device object to match
772  * @default_id:	ID string to use as default if no compatible string found
773  * @modalias:   Pointer to buffer that modalias value will be copied into
774  * @len:	Length of modalias buffer
775  *
776  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
777  * If there is a compatible string for @adev, it will be copied to @modalias
778  * with the vendor prefix stripped; otherwise, @default_id will be used.
779  */
780 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
781 		       char *modalias, size_t len)
782 {
783 	if (!acpi_of_modalias(adev, modalias, len))
784 		strlcpy(modalias, default_id, len);
785 }
786 EXPORT_SYMBOL_GPL(acpi_set_modalias);
787 
788 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
789 				    struct acpi_hardware_id *hwid)
790 {
791 	int i, msk, byte_shift;
792 	char buf[3];
793 
794 	if (!id->cls)
795 		return false;
796 
797 	/* Apply class-code bitmask, before checking each class-code byte */
798 	for (i = 1; i <= 3; i++) {
799 		byte_shift = 8 * (3 - i);
800 		msk = (id->cls_msk >> byte_shift) & 0xFF;
801 		if (!msk)
802 			continue;
803 
804 		sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
805 		if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
806 			return false;
807 	}
808 	return true;
809 }
810 
811 static bool __acpi_match_device(struct acpi_device *device,
812 				const struct acpi_device_id *acpi_ids,
813 				const struct of_device_id *of_ids,
814 				const struct acpi_device_id **acpi_id,
815 				const struct of_device_id **of_id)
816 {
817 	const struct acpi_device_id *id;
818 	struct acpi_hardware_id *hwid;
819 
820 	/*
821 	 * If the device is not present, it is unnecessary to load device
822 	 * driver for it.
823 	 */
824 	if (!device || !device->status.present)
825 		return false;
826 
827 	list_for_each_entry(hwid, &device->pnp.ids, list) {
828 		/* First, check the ACPI/PNP IDs provided by the caller. */
829 		if (acpi_ids) {
830 			for (id = acpi_ids; id->id[0] || id->cls; id++) {
831 				if (id->id[0] && !strcmp((char *)id->id, hwid->id))
832 					goto out_acpi_match;
833 				if (id->cls && __acpi_match_device_cls(id, hwid))
834 					goto out_acpi_match;
835 			}
836 		}
837 
838 		/*
839 		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
840 		 * "compatible" property if found.
841 		 */
842 		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
843 			return acpi_of_match_device(device, of_ids, of_id);
844 	}
845 	return false;
846 
847 out_acpi_match:
848 	if (acpi_id)
849 		*acpi_id = id;
850 	return true;
851 }
852 
853 /**
854  * acpi_match_device - Match a struct device against a given list of ACPI IDs
855  * @ids: Array of struct acpi_device_id object to match against.
856  * @dev: The device structure to match.
857  *
858  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
859  * object for that handle and use that object to match against a given list of
860  * device IDs.
861  *
862  * Return a pointer to the first matching ID on success or %NULL on failure.
863  */
864 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
865 					       const struct device *dev)
866 {
867 	const struct acpi_device_id *id = NULL;
868 
869 	__acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
870 	return id;
871 }
872 EXPORT_SYMBOL_GPL(acpi_match_device);
873 
874 static const void *acpi_of_device_get_match_data(const struct device *dev)
875 {
876 	struct acpi_device *adev = ACPI_COMPANION(dev);
877 	const struct of_device_id *match = NULL;
878 
879 	if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
880 		return NULL;
881 
882 	return match->data;
883 }
884 
885 const void *acpi_device_get_match_data(const struct device *dev)
886 {
887 	const struct acpi_device_id *match;
888 
889 	if (!dev->driver->acpi_match_table)
890 		return acpi_of_device_get_match_data(dev);
891 
892 	match = acpi_match_device(dev->driver->acpi_match_table, dev);
893 	if (!match)
894 		return NULL;
895 
896 	return (const void *)match->driver_data;
897 }
898 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
899 
900 int acpi_match_device_ids(struct acpi_device *device,
901 			  const struct acpi_device_id *ids)
902 {
903 	return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
904 }
905 EXPORT_SYMBOL(acpi_match_device_ids);
906 
907 bool acpi_driver_match_device(struct device *dev,
908 			      const struct device_driver *drv)
909 {
910 	if (!drv->acpi_match_table)
911 		return acpi_of_match_device(ACPI_COMPANION(dev),
912 					    drv->of_match_table,
913 					    NULL);
914 
915 	return __acpi_match_device(acpi_companion_match(dev),
916 				   drv->acpi_match_table, drv->of_match_table,
917 				   NULL, NULL);
918 }
919 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
920 
921 /* --------------------------------------------------------------------------
922                               ACPI Driver Management
923    -------------------------------------------------------------------------- */
924 
925 /**
926  * acpi_bus_register_driver - register a driver with the ACPI bus
927  * @driver: driver being registered
928  *
929  * Registers a driver with the ACPI bus.  Searches the namespace for all
930  * devices that match the driver's criteria and binds.  Returns zero for
931  * success or a negative error status for failure.
932  */
933 int acpi_bus_register_driver(struct acpi_driver *driver)
934 {
935 	int ret;
936 
937 	if (acpi_disabled)
938 		return -ENODEV;
939 	driver->drv.name = driver->name;
940 	driver->drv.bus = &acpi_bus_type;
941 	driver->drv.owner = driver->owner;
942 
943 	ret = driver_register(&driver->drv);
944 	return ret;
945 }
946 
947 EXPORT_SYMBOL(acpi_bus_register_driver);
948 
949 /**
950  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
951  * @driver: driver to unregister
952  *
953  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
954  * devices that match the driver's criteria and unbinds.
955  */
956 void acpi_bus_unregister_driver(struct acpi_driver *driver)
957 {
958 	driver_unregister(&driver->drv);
959 }
960 
961 EXPORT_SYMBOL(acpi_bus_unregister_driver);
962 
963 /* --------------------------------------------------------------------------
964                               ACPI Bus operations
965    -------------------------------------------------------------------------- */
966 
967 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
968 {
969 	struct acpi_device *acpi_dev = to_acpi_device(dev);
970 	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
971 
972 	return acpi_dev->flags.match_driver
973 		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
974 }
975 
976 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
977 {
978 	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
979 }
980 
981 static int acpi_device_probe(struct device *dev)
982 {
983 	struct acpi_device *acpi_dev = to_acpi_device(dev);
984 	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
985 	int ret;
986 
987 	if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
988 		return -EINVAL;
989 
990 	if (!acpi_drv->ops.add)
991 		return -ENOSYS;
992 
993 	ret = acpi_drv->ops.add(acpi_dev);
994 	if (ret)
995 		return ret;
996 
997 	acpi_dev->driver = acpi_drv;
998 
999 	pr_debug("Driver [%s] successfully bound to device [%s]\n",
1000 		 acpi_drv->name, acpi_dev->pnp.bus_id);
1001 
1002 	if (acpi_drv->ops.notify) {
1003 		ret = acpi_device_install_notify_handler(acpi_dev);
1004 		if (ret) {
1005 			if (acpi_drv->ops.remove)
1006 				acpi_drv->ops.remove(acpi_dev);
1007 
1008 			acpi_dev->driver = NULL;
1009 			acpi_dev->driver_data = NULL;
1010 			return ret;
1011 		}
1012 	}
1013 
1014 	pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1015 		 acpi_dev->pnp.bus_id);
1016 
1017 	get_device(dev);
1018 	return 0;
1019 }
1020 
1021 static int acpi_device_remove(struct device *dev)
1022 {
1023 	struct acpi_device *acpi_dev = to_acpi_device(dev);
1024 	struct acpi_driver *acpi_drv = acpi_dev->driver;
1025 
1026 	if (acpi_drv) {
1027 		if (acpi_drv->ops.notify)
1028 			acpi_device_remove_notify_handler(acpi_dev);
1029 		if (acpi_drv->ops.remove)
1030 			acpi_drv->ops.remove(acpi_dev);
1031 	}
1032 	acpi_dev->driver = NULL;
1033 	acpi_dev->driver_data = NULL;
1034 
1035 	put_device(dev);
1036 	return 0;
1037 }
1038 
1039 struct bus_type acpi_bus_type = {
1040 	.name		= "acpi",
1041 	.match		= acpi_bus_match,
1042 	.probe		= acpi_device_probe,
1043 	.remove		= acpi_device_remove,
1044 	.uevent		= acpi_device_uevent,
1045 };
1046 
1047 /* --------------------------------------------------------------------------
1048                              Initialization/Cleanup
1049    -------------------------------------------------------------------------- */
1050 
1051 static int __init acpi_bus_init_irq(void)
1052 {
1053 	acpi_status status;
1054 	char *message = NULL;
1055 
1056 
1057 	/*
1058 	 * Let the system know what interrupt model we are using by
1059 	 * evaluating the \_PIC object, if exists.
1060 	 */
1061 
1062 	switch (acpi_irq_model) {
1063 	case ACPI_IRQ_MODEL_PIC:
1064 		message = "PIC";
1065 		break;
1066 	case ACPI_IRQ_MODEL_IOAPIC:
1067 		message = "IOAPIC";
1068 		break;
1069 	case ACPI_IRQ_MODEL_IOSAPIC:
1070 		message = "IOSAPIC";
1071 		break;
1072 	case ACPI_IRQ_MODEL_GIC:
1073 		message = "GIC";
1074 		break;
1075 	case ACPI_IRQ_MODEL_PLATFORM:
1076 		message = "platform specific model";
1077 		break;
1078 	default:
1079 		pr_info("Unknown interrupt routing model\n");
1080 		return -ENODEV;
1081 	}
1082 
1083 	pr_info("Using %s for interrupt routing\n", message);
1084 
1085 	status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1086 	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1087 		pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1088 		return -ENODEV;
1089 	}
1090 
1091 	return 0;
1092 }
1093 
1094 /**
1095  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1096  *
1097  * The ACPI tables are accessible after this, but the handling of events has not
1098  * been initialized and the global lock is not available yet, so AML should not
1099  * be executed at this point.
1100  *
1101  * Doing this before switching the EFI runtime services to virtual mode allows
1102  * the EfiBootServices memory to be freed slightly earlier on boot.
1103  */
1104 void __init acpi_early_init(void)
1105 {
1106 	acpi_status status;
1107 
1108 	if (acpi_disabled)
1109 		return;
1110 
1111 	pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1112 
1113 	/* enable workarounds, unless strict ACPI spec. compliance */
1114 	if (!acpi_strict)
1115 		acpi_gbl_enable_interpreter_slack = TRUE;
1116 
1117 	acpi_permanent_mmap = true;
1118 
1119 #ifdef CONFIG_X86
1120 	/*
1121 	 * If the machine falls into the DMI check table,
1122 	 * DSDT will be copied to memory.
1123 	 * Note that calling dmi_check_system() here on other architectures
1124 	 * would not be OK because only x86 initializes dmi early enough.
1125 	 * Thankfully only x86 systems need such quirks for now.
1126 	 */
1127 	dmi_check_system(dsdt_dmi_table);
1128 #endif
1129 
1130 	status = acpi_reallocate_root_table();
1131 	if (ACPI_FAILURE(status)) {
1132 		pr_err("Unable to reallocate ACPI tables\n");
1133 		goto error0;
1134 	}
1135 
1136 	status = acpi_initialize_subsystem();
1137 	if (ACPI_FAILURE(status)) {
1138 		pr_err("Unable to initialize the ACPI Interpreter\n");
1139 		goto error0;
1140 	}
1141 
1142 #ifdef CONFIG_X86
1143 	if (!acpi_ioapic) {
1144 		/* compatible (0) means level (3) */
1145 		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1146 			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1147 			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1148 		}
1149 		/* Set PIC-mode SCI trigger type */
1150 		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1151 					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1152 	} else {
1153 		/*
1154 		 * now that acpi_gbl_FADT is initialized,
1155 		 * update it with result from INT_SRC_OVR parsing
1156 		 */
1157 		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1158 	}
1159 #endif
1160 	return;
1161 
1162  error0:
1163 	disable_acpi();
1164 }
1165 
1166 /**
1167  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1168  *
1169  * Switch over the platform to the ACPI mode (if possible).
1170  *
1171  * Doing this too early is generally unsafe, but at the same time it needs to be
1172  * done before all things that really depend on ACPI.  The right spot appears to
1173  * be before finalizing the EFI initialization.
1174  */
1175 void __init acpi_subsystem_init(void)
1176 {
1177 	acpi_status status;
1178 
1179 	if (acpi_disabled)
1180 		return;
1181 
1182 	status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1183 	if (ACPI_FAILURE(status)) {
1184 		pr_err("Unable to enable ACPI\n");
1185 		disable_acpi();
1186 	} else {
1187 		/*
1188 		 * If the system is using ACPI then we can be reasonably
1189 		 * confident that any regulators are managed by the firmware
1190 		 * so tell the regulator core it has everything it needs to
1191 		 * know.
1192 		 */
1193 		regulator_has_full_constraints();
1194 	}
1195 }
1196 
1197 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1198 {
1199 	if (event == ACPI_TABLE_EVENT_LOAD)
1200 		acpi_scan_table_notify();
1201 
1202 	return acpi_sysfs_table_handler(event, table, context);
1203 }
1204 
1205 static int __init acpi_bus_init(void)
1206 {
1207 	int result;
1208 	acpi_status status;
1209 
1210 	acpi_os_initialize1();
1211 
1212 	status = acpi_load_tables();
1213 	if (ACPI_FAILURE(status)) {
1214 		pr_err("Unable to load the System Description Tables\n");
1215 		goto error1;
1216 	}
1217 
1218 	/*
1219 	 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1220 	 * device is found in the namespace.
1221 	 *
1222 	 * This is accomplished by looking for the ECDT table and getting the EC
1223 	 * parameters out of that.
1224 	 *
1225 	 * Do that before calling acpi_initialize_objects() which may trigger EC
1226 	 * address space accesses.
1227 	 */
1228 	acpi_ec_ecdt_probe();
1229 
1230 	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1231 	if (ACPI_FAILURE(status)) {
1232 		pr_err("Unable to start the ACPI Interpreter\n");
1233 		goto error1;
1234 	}
1235 
1236 	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1237 	if (ACPI_FAILURE(status)) {
1238 		pr_err("Unable to initialize ACPI objects\n");
1239 		goto error1;
1240 	}
1241 
1242 	/* Set capability bits for _OSC under processor scope */
1243 	acpi_early_processor_osc();
1244 
1245 	/*
1246 	 * _OSC method may exist in module level code,
1247 	 * so it must be run after ACPI_FULL_INITIALIZATION
1248 	 */
1249 	acpi_bus_osc_negotiate_platform_control();
1250 	acpi_bus_osc_negotiate_usb_control();
1251 
1252 	/*
1253 	 * _PDC control method may load dynamic SSDT tables,
1254 	 * and we need to install the table handler before that.
1255 	 */
1256 	status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1257 
1258 	acpi_sysfs_init();
1259 
1260 	acpi_early_processor_set_pdc();
1261 
1262 	/*
1263 	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1264 	 * is necessary to enable it as early as possible.
1265 	 */
1266 	acpi_ec_dsdt_probe();
1267 
1268 	pr_info("Interpreter enabled\n");
1269 
1270 	/* Initialize sleep structures */
1271 	acpi_sleep_init();
1272 
1273 	/*
1274 	 * Get the system interrupt model and evaluate \_PIC.
1275 	 */
1276 	result = acpi_bus_init_irq();
1277 	if (result)
1278 		goto error1;
1279 
1280 	/*
1281 	 * Register the for all standard device notifications.
1282 	 */
1283 	status =
1284 	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1285 					&acpi_bus_notify, NULL);
1286 	if (ACPI_FAILURE(status)) {
1287 		pr_err("Unable to register for system notifications\n");
1288 		goto error1;
1289 	}
1290 
1291 	/*
1292 	 * Create the top ACPI proc directory
1293 	 */
1294 	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1295 
1296 	result = bus_register(&acpi_bus_type);
1297 	if (!result)
1298 		return 0;
1299 
1300 	/* Mimic structured exception handling */
1301       error1:
1302 	acpi_terminate();
1303 	return -ENODEV;
1304 }
1305 
1306 struct kobject *acpi_kobj;
1307 EXPORT_SYMBOL_GPL(acpi_kobj);
1308 
1309 static int __init acpi_init(void)
1310 {
1311 	int result;
1312 
1313 	if (acpi_disabled) {
1314 		pr_info("Interpreter disabled.\n");
1315 		return -ENODEV;
1316 	}
1317 
1318 	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1319 	if (!acpi_kobj)
1320 		pr_debug("%s: kset create error\n", __func__);
1321 
1322 	init_prmt();
1323 	result = acpi_bus_init();
1324 	if (result) {
1325 		kobject_put(acpi_kobj);
1326 		disable_acpi();
1327 		return result;
1328 	}
1329 
1330 	pci_mmcfg_late_init();
1331 	acpi_iort_init();
1332 	acpi_scan_init();
1333 	acpi_ec_init();
1334 	acpi_debugfs_init();
1335 	acpi_sleep_proc_init();
1336 	acpi_wakeup_device_init();
1337 	acpi_debugger_init();
1338 	acpi_setup_sb_notify_handler();
1339 	acpi_viot_init();
1340 	return 0;
1341 }
1342 
1343 subsys_initcall(acpi_init);
1344