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_viot.h>
30#include <linux/pci.h>
31#include <acpi/apei.h>
32#include <linux/suspend.h>
33#include <linux/prmt.h>
34
35#include "internal.h"
36
37struct acpi_device *acpi_root;
38struct proc_dir_entry *acpi_root_dir;
39EXPORT_SYMBOL(acpi_root_dir);
40
41#ifdef CONFIG_X86
42#ifdef CONFIG_ACPI_CUSTOM_DSDT
43static inline int set_copy_dsdt(const struct dmi_system_id *id)
44{
45 return 0;
46}
47#else
48static int set_copy_dsdt(const struct dmi_system_id *id)
49{
50 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
51 acpi_gbl_copy_dsdt_locally = 1;
52 return 0;
53}
54#endif
55
56static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
57 /*
58 * Invoke DSDT corruption work-around on all Toshiba Satellite.
59 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
60 */
61 {
62 .callback = set_copy_dsdt,
63 .ident = "TOSHIBA Satellite",
64 .matches = {
65 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
66 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
67 },
68 },
69 {}
70};
71#endif
72
73/* --------------------------------------------------------------------------
74 Device Management
75 -------------------------------------------------------------------------- */
76
77acpi_status acpi_bus_get_status_handle(acpi_handle handle,
78 unsigned long long *sta)
79{
80 acpi_status status;
81
82 status = acpi_evaluate_integer(handle, pathname: "_STA", NULL, data: sta);
83 if (ACPI_SUCCESS(status))
84 return AE_OK;
85
86 if (status == AE_NOT_FOUND) {
87 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
88 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
89 return AE_OK;
90 }
91 return status;
92}
93EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
94
95int acpi_bus_get_status(struct acpi_device *device)
96{
97 acpi_status status;
98 unsigned long long sta;
99
100 if (acpi_device_override_status(adev: device, status: &sta)) {
101 acpi_set_device_status(adev: device, sta);
102 return 0;
103 }
104
105 /* Battery devices must have their deps met before calling _STA */
106 if (acpi_device_is_battery(adev: device) && device->dep_unmet) {
107 acpi_set_device_status(adev: device, sta: 0);
108 return 0;
109 }
110
111 status = acpi_bus_get_status_handle(device->handle, &sta);
112 if (ACPI_FAILURE(status))
113 return -ENODEV;
114
115 acpi_set_device_status(adev: device, sta);
116
117 if (device->status.functional && !device->status.present) {
118 pr_debug("Device [%s] status [%08x]: functional but not present\n",
119 device->pnp.bus_id, (u32)sta);
120 }
121
122 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
123 return 0;
124}
125EXPORT_SYMBOL(acpi_bus_get_status);
126
127void acpi_bus_private_data_handler(acpi_handle handle,
128 void *context)
129{
130 return;
131}
132EXPORT_SYMBOL(acpi_bus_private_data_handler);
133
134int acpi_bus_attach_private_data(acpi_handle handle, void *data)
135{
136 acpi_status status;
137
138 status = acpi_attach_data(object: handle,
139 handler: acpi_bus_private_data_handler, data);
140 if (ACPI_FAILURE(status)) {
141 acpi_handle_debug(handle, "Error attaching device data\n");
142 return -ENODEV;
143 }
144
145 return 0;
146}
147EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
148
149int acpi_bus_get_private_data(acpi_handle handle, void **data)
150{
151 acpi_status status;
152
153 if (!data)
154 return -EINVAL;
155
156 status = acpi_get_data(object: handle, handler: acpi_bus_private_data_handler, data);
157 if (ACPI_FAILURE(status)) {
158 acpi_handle_debug(handle, "No context for object\n");
159 return -ENODEV;
160 }
161
162 return 0;
163}
164EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
165
166void acpi_bus_detach_private_data(acpi_handle handle)
167{
168 acpi_detach_data(object: handle, handler: acpi_bus_private_data_handler);
169}
170EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
171
172static void acpi_print_osc_error(acpi_handle handle,
173 struct acpi_osc_context *context, char *error)
174{
175 int i;
176
177 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
178
179 pr_debug("_OSC request data:");
180 for (i = 0; i < context->cap.length; i += sizeof(u32))
181 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
182
183 pr_debug("\n");
184}
185
186acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
187{
188 acpi_status status;
189 struct acpi_object_list input;
190 union acpi_object in_params[4];
191 union acpi_object *out_obj;
192 guid_t guid;
193 u32 errors;
194 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
195
196 if (!context)
197 return AE_ERROR;
198 if (guid_parse(uuid: context->uuid_str, u: &guid))
199 return AE_ERROR;
200 context->ret.length = ACPI_ALLOCATE_BUFFER;
201 context->ret.pointer = NULL;
202
203 /* Setting up input parameters */
204 input.count = 4;
205 input.pointer = in_params;
206 in_params[0].type = ACPI_TYPE_BUFFER;
207 in_params[0].buffer.length = 16;
208 in_params[0].buffer.pointer = (u8 *)&guid;
209 in_params[1].type = ACPI_TYPE_INTEGER;
210 in_params[1].integer.value = context->rev;
211 in_params[2].type = ACPI_TYPE_INTEGER;
212 in_params[2].integer.value = context->cap.length/sizeof(u32);
213 in_params[3].type = ACPI_TYPE_BUFFER;
214 in_params[3].buffer.length = context->cap.length;
215 in_params[3].buffer.pointer = context->cap.pointer;
216
217 status = acpi_evaluate_object(object: handle, pathname: "_OSC", parameter_objects: &input, return_object_buffer: &output);
218 if (ACPI_FAILURE(status))
219 return status;
220
221 if (!output.length)
222 return AE_NULL_OBJECT;
223
224 out_obj = output.pointer;
225 if (out_obj->type != ACPI_TYPE_BUFFER
226 || out_obj->buffer.length != context->cap.length) {
227 acpi_print_osc_error(handle, context,
228 error: "_OSC evaluation returned wrong type");
229 status = AE_TYPE;
230 goto out_kfree;
231 }
232 /* Need to ignore the bit0 in result code */
233 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
234 if (errors) {
235 if (errors & OSC_REQUEST_ERROR)
236 acpi_print_osc_error(handle, context,
237 error: "_OSC request failed");
238 if (errors & OSC_INVALID_UUID_ERROR)
239 acpi_print_osc_error(handle, context,
240 error: "_OSC invalid UUID");
241 if (errors & OSC_INVALID_REVISION_ERROR)
242 acpi_print_osc_error(handle, context,
243 error: "_OSC invalid revision");
244 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
245 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
246 & OSC_QUERY_ENABLE)
247 goto out_success;
248 status = AE_SUPPORT;
249 goto out_kfree;
250 }
251 status = AE_ERROR;
252 goto out_kfree;
253 }
254out_success:
255 context->ret.length = out_obj->buffer.length;
256 context->ret.pointer = kmemdup(p: out_obj->buffer.pointer,
257 size: context->ret.length, GFP_KERNEL);
258 if (!context->ret.pointer) {
259 status = AE_NO_MEMORY;
260 goto out_kfree;
261 }
262 status = AE_OK;
263
264out_kfree:
265 kfree(objp: output.pointer);
266 return status;
267}
268EXPORT_SYMBOL(acpi_run_osc);
269
270bool osc_sb_apei_support_acked;
271
272/*
273 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
274 * OSPM supports platform coordinated low power idle(LPI) states
275 */
276bool osc_pc_lpi_support_confirmed;
277EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
278
279/*
280 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
281 * Starting with ACPI Specification 6.2, all _CPC registers can be in
282 * PCC, System Memory, System IO, or Functional Fixed Hardware address
283 * spaces. OSPM support for this more flexible register space scheme is
284 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
285 *
286 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
287 * - PCC or Functional Fixed Hardware address space if defined
288 * - SystemMemory address space (NULL register) if not defined
289 */
290bool osc_cpc_flexible_adr_space_confirmed;
291EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
292
293/*
294 * ACPI 6.4 Operating System Capabilities for USB.
295 */
296bool osc_sb_native_usb4_support_confirmed;
297EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
298
299bool osc_sb_cppc2_support_acked;
300
301static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
302static void acpi_bus_osc_negotiate_platform_control(void)
303{
304 u32 capbuf[2], *capbuf_ret;
305 struct acpi_osc_context context = {
306 .uuid_str = sb_uuid_str,
307 .rev = 1,
308 .cap.length = 8,
309 .cap.pointer = capbuf,
310 };
311 acpi_handle handle;
312
313 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
314 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
315 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
316 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
317 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
319
320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
322 if (IS_ENABLED(CONFIG_ACPI_PRMT))
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
324 if (IS_ENABLED(CONFIG_ACPI_FFH))
325 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
326
327#ifdef CONFIG_ARM64
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
329#endif
330#ifdef CONFIG_X86
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
332#endif
333
334#ifdef CONFIG_ACPI_CPPC_LIB
335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
337#endif
338
339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
340
341 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
343
344 if (IS_ENABLED(CONFIG_USB4))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
346
347 if (!ghes_disable)
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
349 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
350 return;
351
352 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
353 return;
354
355 capbuf_ret = context.ret.pointer;
356 if (context.ret.length <= OSC_SUPPORT_DWORD) {
357 kfree(objp: context.ret.pointer);
358 return;
359 }
360
361 /*
362 * Now run _OSC again with query flag clear and with the caps
363 * supported by both the OS and the platform.
364 */
365 capbuf[OSC_QUERY_DWORD] = 0;
366 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
367 kfree(objp: context.ret.pointer);
368
369 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
370 return;
371
372 capbuf_ret = context.ret.pointer;
373 if (context.ret.length > OSC_SUPPORT_DWORD) {
374#ifdef CONFIG_ACPI_CPPC_LIB
375 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
376#endif
377
378 osc_sb_apei_support_acked =
379 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
380 osc_pc_lpi_support_confirmed =
381 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
382 osc_sb_native_usb4_support_confirmed =
383 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
384 osc_cpc_flexible_adr_space_confirmed =
385 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
386 }
387
388 kfree(objp: context.ret.pointer);
389}
390
391/*
392 * Native control of USB4 capabilities. If any of the tunneling bits is
393 * set it means OS is in control and we use software based connection
394 * manager.
395 */
396u32 osc_sb_native_usb4_control;
397EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
398
399static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
400{
401 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
402 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
403 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
404 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
405 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
406}
407
408static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
409static void acpi_bus_osc_negotiate_usb_control(void)
410{
411 u32 capbuf[3];
412 struct acpi_osc_context context = {
413 .uuid_str = sb_usb_uuid_str,
414 .rev = 1,
415 .cap.length = sizeof(capbuf),
416 .cap.pointer = capbuf,
417 };
418 acpi_handle handle;
419 acpi_status status;
420 u32 control;
421
422 if (!osc_sb_native_usb4_support_confirmed)
423 return;
424
425 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
426 return;
427
428 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
429 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
430
431 capbuf[OSC_QUERY_DWORD] = 0;
432 capbuf[OSC_SUPPORT_DWORD] = 0;
433 capbuf[OSC_CONTROL_DWORD] = control;
434
435 status = acpi_run_osc(handle, &context);
436 if (ACPI_FAILURE(status))
437 return;
438
439 if (context.ret.length != sizeof(capbuf)) {
440 pr_info("USB4 _OSC: returned invalid length buffer\n");
441 goto out_free;
442 }
443
444 osc_sb_native_usb4_control =
445 control & acpi_osc_ctx_get_pci_control(context: &context);
446
447 acpi_bus_decode_usb_osc(msg: "USB4 _OSC: OS supports", bits: control);
448 acpi_bus_decode_usb_osc(msg: "USB4 _OSC: OS controls",
449 bits: osc_sb_native_usb4_control);
450
451out_free:
452 kfree(objp: context.ret.pointer);
453}
454
455/* --------------------------------------------------------------------------
456 Notification Handling
457 -------------------------------------------------------------------------- */
458
459/**
460 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
461 * @handle: Target ACPI object.
462 * @type: Notification type.
463 * @data: Ignored.
464 *
465 * This only handles notifications related to device hotplug.
466 */
467static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
468{
469 struct acpi_device *adev;
470
471 switch (type) {
472 case ACPI_NOTIFY_BUS_CHECK:
473 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
474 break;
475
476 case ACPI_NOTIFY_DEVICE_CHECK:
477 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
478 break;
479
480 case ACPI_NOTIFY_DEVICE_WAKE:
481 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
482 return;
483
484 case ACPI_NOTIFY_EJECT_REQUEST:
485 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
486 break;
487
488 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
489 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
490 /* TBD: Exactly what does 'light' mean? */
491 return;
492
493 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
494 acpi_handle_err(handle, "Device cannot be configured due "
495 "to a frequency mismatch\n");
496 return;
497
498 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
499 acpi_handle_err(handle, "Device cannot be configured due "
500 "to a bus mode mismatch\n");
501 return;
502
503 case ACPI_NOTIFY_POWER_FAULT:
504 acpi_handle_err(handle, "Device has suffered a power fault\n");
505 return;
506
507 default:
508 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
509 return;
510 }
511
512 adev = acpi_get_acpi_dev(handle);
513
514 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
515 return;
516
517 acpi_put_acpi_dev(adev);
518
519 acpi_evaluate_ost(handle, source_event: type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
520}
521
522static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
523{
524 struct acpi_device *device = data;
525 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
526
527 acpi_drv->ops.notify(device, event);
528}
529
530static int acpi_device_install_notify_handler(struct acpi_device *device,
531 struct acpi_driver *acpi_drv)
532{
533 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
534 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
535 acpi_status status;
536
537 status = acpi_install_notify_handler(device: device->handle, handler_type: type,
538 handler: acpi_notify_device, context: device);
539 if (ACPI_FAILURE(status))
540 return -EINVAL;
541
542 return 0;
543}
544
545static void acpi_device_remove_notify_handler(struct acpi_device *device,
546 struct acpi_driver *acpi_drv)
547{
548 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
549 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
550
551 acpi_remove_notify_handler(device: device->handle, handler_type: type,
552 handler: acpi_notify_device);
553
554 acpi_os_wait_events_complete();
555}
556
557int acpi_dev_install_notify_handler(struct acpi_device *adev,
558 u32 handler_type,
559 acpi_notify_handler handler, void *context)
560{
561 acpi_status status;
562
563 status = acpi_install_notify_handler(device: adev->handle, handler_type,
564 handler, context);
565 if (ACPI_FAILURE(status))
566 return -ENODEV;
567
568 return 0;
569}
570EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
571
572void acpi_dev_remove_notify_handler(struct acpi_device *adev,
573 u32 handler_type,
574 acpi_notify_handler handler)
575{
576 acpi_remove_notify_handler(device: adev->handle, handler_type, handler);
577 acpi_os_wait_events_complete();
578}
579EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
580
581/* Handle events targeting \_SB device (at present only graceful shutdown) */
582
583#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
584#define ACPI_SB_INDICATE_INTERVAL 10000
585
586static void sb_notify_work(struct work_struct *dummy)
587{
588 acpi_handle sb_handle;
589
590 orderly_poweroff(force: true);
591
592 /*
593 * After initiating graceful shutdown, the ACPI spec requires OSPM
594 * to evaluate _OST method once every 10seconds to indicate that
595 * the shutdown is in progress
596 */
597 acpi_get_handle(NULL, pathname: "\\_SB", ret_handle: &sb_handle);
598 while (1) {
599 pr_info("Graceful shutdown in progress.\n");
600 acpi_evaluate_ost(handle: sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
601 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
602 msleep(ACPI_SB_INDICATE_INTERVAL);
603 }
604}
605
606static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
607{
608 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
609
610 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
611 if (!work_busy(work: &acpi_sb_work))
612 schedule_work(work: &acpi_sb_work);
613 } else {
614 pr_warn("event %x is not supported by \\_SB device\n", event);
615 }
616}
617
618static int __init acpi_setup_sb_notify_handler(void)
619{
620 acpi_handle sb_handle;
621
622 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
623 return -ENXIO;
624
625 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
626 acpi_sb_notify, NULL)))
627 return -EINVAL;
628
629 return 0;
630}
631
632/* --------------------------------------------------------------------------
633 Device Matching
634 -------------------------------------------------------------------------- */
635
636/**
637 * acpi_get_first_physical_node - Get first physical node of an ACPI device
638 * @adev: ACPI device in question
639 *
640 * Return: First physical node of ACPI device @adev
641 */
642struct device *acpi_get_first_physical_node(struct acpi_device *adev)
643{
644 struct mutex *physical_node_lock = &adev->physical_node_lock;
645 struct device *phys_dev;
646
647 mutex_lock(physical_node_lock);
648 if (list_empty(head: &adev->physical_node_list)) {
649 phys_dev = NULL;
650 } else {
651 const struct acpi_device_physical_node *node;
652
653 node = list_first_entry(&adev->physical_node_list,
654 struct acpi_device_physical_node, node);
655
656 phys_dev = node->dev;
657 }
658 mutex_unlock(lock: physical_node_lock);
659 return phys_dev;
660}
661EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
662
663static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
664 const struct device *dev)
665{
666 const struct device *phys_dev = acpi_get_first_physical_node(adev);
667
668 return phys_dev && phys_dev == dev ? adev : NULL;
669}
670
671/**
672 * acpi_device_is_first_physical_node - Is given dev first physical node
673 * @adev: ACPI companion device
674 * @dev: Physical device to check
675 *
676 * Function checks if given @dev is the first physical devices attached to
677 * the ACPI companion device. This distinction is needed in some cases
678 * where the same companion device is shared between many physical devices.
679 *
680 * Note that the caller have to provide valid @adev pointer.
681 */
682bool acpi_device_is_first_physical_node(struct acpi_device *adev,
683 const struct device *dev)
684{
685 return !!acpi_primary_dev_companion(adev, dev);
686}
687
688/*
689 * acpi_companion_match() - Can we match via ACPI companion device
690 * @dev: Device in question
691 *
692 * Check if the given device has an ACPI companion and if that companion has
693 * a valid list of PNP IDs, and if the device is the first (primary) physical
694 * device associated with it. Return the companion pointer if that's the case
695 * or NULL otherwise.
696 *
697 * If multiple physical devices are attached to a single ACPI companion, we need
698 * to be careful. The usage scenario for this kind of relationship is that all
699 * of the physical devices in question use resources provided by the ACPI
700 * companion. A typical case is an MFD device where all the sub-devices share
701 * the parent's ACPI companion. In such cases we can only allow the primary
702 * (first) physical device to be matched with the help of the companion's PNP
703 * IDs.
704 *
705 * Additional physical devices sharing the ACPI companion can still use
706 * resources available from it but they will be matched normally using functions
707 * provided by their bus types (and analogously for their modalias).
708 */
709const struct acpi_device *acpi_companion_match(const struct device *dev)
710{
711 struct acpi_device *adev;
712
713 adev = ACPI_COMPANION(dev);
714 if (!adev)
715 return NULL;
716
717 if (list_empty(head: &adev->pnp.ids))
718 return NULL;
719
720 return acpi_primary_dev_companion(adev, dev);
721}
722
723/**
724 * acpi_of_match_device - Match device object using the "compatible" property.
725 * @adev: ACPI device object to match.
726 * @of_match_table: List of device IDs to match against.
727 * @of_id: OF ID if matched
728 *
729 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
730 * identifiers and a _DSD object with the "compatible" property, use that
731 * property to match against the given list of identifiers.
732 */
733static bool acpi_of_match_device(const struct acpi_device *adev,
734 const struct of_device_id *of_match_table,
735 const struct of_device_id **of_id)
736{
737 const union acpi_object *of_compatible, *obj;
738 int i, nval;
739
740 if (!adev)
741 return false;
742
743 of_compatible = adev->data.of_compatible;
744 if (!of_match_table || !of_compatible)
745 return false;
746
747 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
748 nval = of_compatible->package.count;
749 obj = of_compatible->package.elements;
750 } else { /* Must be ACPI_TYPE_STRING. */
751 nval = 1;
752 obj = of_compatible;
753 }
754 /* Now we can look for the driver DT compatible strings */
755 for (i = 0; i < nval; i++, obj++) {
756 const struct of_device_id *id;
757
758 for (id = of_match_table; id->compatible[0]; id++)
759 if (!strcasecmp(s1: obj->string.pointer, s2: id->compatible)) {
760 if (of_id)
761 *of_id = id;
762 return true;
763 }
764 }
765
766 return false;
767}
768
769static bool acpi_of_modalias(struct acpi_device *adev,
770 char *modalias, size_t len)
771{
772 const union acpi_object *of_compatible;
773 const union acpi_object *obj;
774 const char *str, *chr;
775
776 of_compatible = adev->data.of_compatible;
777 if (!of_compatible)
778 return false;
779
780 if (of_compatible->type == ACPI_TYPE_PACKAGE)
781 obj = of_compatible->package.elements;
782 else /* Must be ACPI_TYPE_STRING. */
783 obj = of_compatible;
784
785 str = obj->string.pointer;
786 chr = strchr(str, ',');
787 strscpy(p: modalias, q: chr ? chr + 1 : str, size: len);
788
789 return true;
790}
791
792/**
793 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
794 * @adev: ACPI device object to match
795 * @default_id: ID string to use as default if no compatible string found
796 * @modalias: Pointer to buffer that modalias value will be copied into
797 * @len: Length of modalias buffer
798 *
799 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
800 * objects. If there is a compatible string for @adev, it will be copied to
801 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
802 * used.
803 */
804void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
805 char *modalias, size_t len)
806{
807 if (!acpi_of_modalias(adev, modalias, len))
808 strscpy(p: modalias, q: default_id, size: len);
809}
810EXPORT_SYMBOL_GPL(acpi_set_modalias);
811
812static bool __acpi_match_device_cls(const struct acpi_device_id *id,
813 struct acpi_hardware_id *hwid)
814{
815 int i, msk, byte_shift;
816 char buf[3];
817
818 if (!id->cls)
819 return false;
820
821 /* Apply class-code bitmask, before checking each class-code byte */
822 for (i = 1; i <= 3; i++) {
823 byte_shift = 8 * (3 - i);
824 msk = (id->cls_msk >> byte_shift) & 0xFF;
825 if (!msk)
826 continue;
827
828 sprintf(buf, fmt: "%02x", (id->cls >> byte_shift) & msk);
829 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
830 return false;
831 }
832 return true;
833}
834
835static bool __acpi_match_device(const struct acpi_device *device,
836 const struct acpi_device_id *acpi_ids,
837 const struct of_device_id *of_ids,
838 const struct acpi_device_id **acpi_id,
839 const struct of_device_id **of_id)
840{
841 const struct acpi_device_id *id;
842 struct acpi_hardware_id *hwid;
843
844 /*
845 * If the device is not present, it is unnecessary to load device
846 * driver for it.
847 */
848 if (!device || !device->status.present)
849 return false;
850
851 list_for_each_entry(hwid, &device->pnp.ids, list) {
852 /* First, check the ACPI/PNP IDs provided by the caller. */
853 if (acpi_ids) {
854 for (id = acpi_ids; id->id[0] || id->cls; id++) {
855 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
856 goto out_acpi_match;
857 if (id->cls && __acpi_match_device_cls(id, hwid))
858 goto out_acpi_match;
859 }
860 }
861
862 /*
863 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
864 * "compatible" property if found.
865 */
866 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
867 return acpi_of_match_device(adev: device, of_match_table: of_ids, of_id);
868 }
869 return false;
870
871out_acpi_match:
872 if (acpi_id)
873 *acpi_id = id;
874 return true;
875}
876
877/**
878 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
879 * @ids: Array of struct acpi_device_id objects to match against.
880 * @adev: The ACPI device pointer to match.
881 *
882 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
883 *
884 * Return:
885 * a pointer to the first matching ACPI ID on success or %NULL on failure.
886 */
887const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
888 const struct acpi_device *adev)
889{
890 const struct acpi_device_id *id = NULL;
891
892 __acpi_match_device(device: adev, acpi_ids: ids, NULL, acpi_id: &id, NULL);
893 return id;
894}
895EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
896
897/**
898 * acpi_match_device - Match a struct device against a given list of ACPI IDs
899 * @ids: Array of struct acpi_device_id object to match against.
900 * @dev: The device structure to match.
901 *
902 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
903 * object for that handle and use that object to match against a given list of
904 * device IDs.
905 *
906 * Return a pointer to the first matching ID on success or %NULL on failure.
907 */
908const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
909 const struct device *dev)
910{
911 return acpi_match_acpi_device(ids, acpi_companion_match(dev));
912}
913EXPORT_SYMBOL_GPL(acpi_match_device);
914
915static const void *acpi_of_device_get_match_data(const struct device *dev)
916{
917 struct acpi_device *adev = ACPI_COMPANION(dev);
918 const struct of_device_id *match = NULL;
919
920 if (!acpi_of_match_device(adev, of_match_table: dev->driver->of_match_table, of_id: &match))
921 return NULL;
922
923 return match->data;
924}
925
926const void *acpi_device_get_match_data(const struct device *dev)
927{
928 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
929 const struct acpi_device_id *match;
930
931 if (!acpi_ids)
932 return acpi_of_device_get_match_data(dev);
933
934 match = acpi_match_device(acpi_ids, dev);
935 if (!match)
936 return NULL;
937
938 return (const void *)match->driver_data;
939}
940EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
941
942int acpi_match_device_ids(struct acpi_device *device,
943 const struct acpi_device_id *ids)
944{
945 return __acpi_match_device(device, acpi_ids: ids, NULL, NULL, NULL) ? 0 : -ENOENT;
946}
947EXPORT_SYMBOL(acpi_match_device_ids);
948
949bool acpi_driver_match_device(struct device *dev,
950 const struct device_driver *drv)
951{
952 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
953 const struct of_device_id *of_ids = drv->of_match_table;
954
955 if (!acpi_ids)
956 return acpi_of_match_device(ACPI_COMPANION(dev), of_match_table: of_ids, NULL);
957
958 return __acpi_match_device(device: acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
959}
960EXPORT_SYMBOL_GPL(acpi_driver_match_device);
961
962/* --------------------------------------------------------------------------
963 ACPI Driver Management
964 -------------------------------------------------------------------------- */
965
966/**
967 * acpi_bus_register_driver - register a driver with the ACPI bus
968 * @driver: driver being registered
969 *
970 * Registers a driver with the ACPI bus. Searches the namespace for all
971 * devices that match the driver's criteria and binds. Returns zero for
972 * success or a negative error status for failure.
973 */
974int acpi_bus_register_driver(struct acpi_driver *driver)
975{
976 if (acpi_disabled)
977 return -ENODEV;
978 driver->drv.name = driver->name;
979 driver->drv.bus = &acpi_bus_type;
980 driver->drv.owner = driver->owner;
981
982 return driver_register(drv: &driver->drv);
983}
984
985EXPORT_SYMBOL(acpi_bus_register_driver);
986
987/**
988 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
989 * @driver: driver to unregister
990 *
991 * Unregisters a driver with the ACPI bus. Searches the namespace for all
992 * devices that match the driver's criteria and unbinds.
993 */
994void acpi_bus_unregister_driver(struct acpi_driver *driver)
995{
996 driver_unregister(drv: &driver->drv);
997}
998
999EXPORT_SYMBOL(acpi_bus_unregister_driver);
1000
1001/* --------------------------------------------------------------------------
1002 ACPI Bus operations
1003 -------------------------------------------------------------------------- */
1004
1005static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1006{
1007 struct acpi_device *acpi_dev = to_acpi_device(dev);
1008 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1009
1010 return acpi_dev->flags.match_driver
1011 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1012}
1013
1014static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1015{
1016 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1017}
1018
1019static int acpi_device_probe(struct device *dev)
1020{
1021 struct acpi_device *acpi_dev = to_acpi_device(dev);
1022 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1023 int ret;
1024
1025 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1026 return -EINVAL;
1027
1028 if (!acpi_drv->ops.add)
1029 return -ENOSYS;
1030
1031 ret = acpi_drv->ops.add(acpi_dev);
1032 if (ret) {
1033 acpi_dev->driver_data = NULL;
1034 return ret;
1035 }
1036
1037 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1038 acpi_drv->name, acpi_dev->pnp.bus_id);
1039
1040 if (acpi_drv->ops.notify) {
1041 ret = acpi_device_install_notify_handler(device: acpi_dev, acpi_drv);
1042 if (ret) {
1043 if (acpi_drv->ops.remove)
1044 acpi_drv->ops.remove(acpi_dev);
1045
1046 acpi_dev->driver_data = NULL;
1047 return ret;
1048 }
1049 }
1050
1051 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1052 acpi_dev->pnp.bus_id);
1053
1054 get_device(dev);
1055 return 0;
1056}
1057
1058static void acpi_device_remove(struct device *dev)
1059{
1060 struct acpi_device *acpi_dev = to_acpi_device(dev);
1061 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1062
1063 if (acpi_drv->ops.notify)
1064 acpi_device_remove_notify_handler(device: acpi_dev, acpi_drv);
1065
1066 if (acpi_drv->ops.remove)
1067 acpi_drv->ops.remove(acpi_dev);
1068
1069 acpi_dev->driver_data = NULL;
1070
1071 put_device(dev);
1072}
1073
1074struct bus_type acpi_bus_type = {
1075 .name = "acpi",
1076 .match = acpi_bus_match,
1077 .probe = acpi_device_probe,
1078 .remove = acpi_device_remove,
1079 .uevent = acpi_device_uevent,
1080};
1081
1082int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1083{
1084 return bus_for_each_dev(bus: &acpi_bus_type, NULL, data, fn);
1085}
1086EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1087
1088struct acpi_dev_walk_context {
1089 int (*fn)(struct acpi_device *, void *);
1090 void *data;
1091};
1092
1093static int acpi_dev_for_one_check(struct device *dev, void *context)
1094{
1095 struct acpi_dev_walk_context *adwc = context;
1096
1097 if (dev->bus != &acpi_bus_type)
1098 return 0;
1099
1100 return adwc->fn(to_acpi_device(dev), adwc->data);
1101}
1102EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1103
1104int acpi_dev_for_each_child(struct acpi_device *adev,
1105 int (*fn)(struct acpi_device *, void *), void *data)
1106{
1107 struct acpi_dev_walk_context adwc = {
1108 .fn = fn,
1109 .data = data,
1110 };
1111
1112 return device_for_each_child(dev: &adev->dev, data: &adwc, fn: acpi_dev_for_one_check);
1113}
1114
1115int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1116 int (*fn)(struct acpi_device *, void *),
1117 void *data)
1118{
1119 struct acpi_dev_walk_context adwc = {
1120 .fn = fn,
1121 .data = data,
1122 };
1123
1124 return device_for_each_child_reverse(dev: &adev->dev, data: &adwc, fn: acpi_dev_for_one_check);
1125}
1126
1127/* --------------------------------------------------------------------------
1128 Initialization/Cleanup
1129 -------------------------------------------------------------------------- */
1130
1131static int __init acpi_bus_init_irq(void)
1132{
1133 acpi_status status;
1134 char *message = NULL;
1135
1136
1137 /*
1138 * Let the system know what interrupt model we are using by
1139 * evaluating the \_PIC object, if exists.
1140 */
1141
1142 switch (acpi_irq_model) {
1143 case ACPI_IRQ_MODEL_PIC:
1144 message = "PIC";
1145 break;
1146 case ACPI_IRQ_MODEL_IOAPIC:
1147 message = "IOAPIC";
1148 break;
1149 case ACPI_IRQ_MODEL_IOSAPIC:
1150 message = "IOSAPIC";
1151 break;
1152 case ACPI_IRQ_MODEL_GIC:
1153 message = "GIC";
1154 break;
1155 case ACPI_IRQ_MODEL_PLATFORM:
1156 message = "platform specific model";
1157 break;
1158 case ACPI_IRQ_MODEL_LPIC:
1159 message = "LPIC";
1160 break;
1161 default:
1162 pr_info("Unknown interrupt routing model\n");
1163 return -ENODEV;
1164 }
1165
1166 pr_info("Using %s for interrupt routing\n", message);
1167
1168 status = acpi_execute_simple_method(NULL, method: "\\_PIC", arg: acpi_irq_model);
1169 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1170 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1171 return -ENODEV;
1172 }
1173
1174 return 0;
1175}
1176
1177/**
1178 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1179 *
1180 * The ACPI tables are accessible after this, but the handling of events has not
1181 * been initialized and the global lock is not available yet, so AML should not
1182 * be executed at this point.
1183 *
1184 * Doing this before switching the EFI runtime services to virtual mode allows
1185 * the EfiBootServices memory to be freed slightly earlier on boot.
1186 */
1187void __init acpi_early_init(void)
1188{
1189 acpi_status status;
1190
1191 if (acpi_disabled)
1192 return;
1193
1194 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1195
1196 /* enable workarounds, unless strict ACPI spec. compliance */
1197 if (!acpi_strict)
1198 acpi_gbl_enable_interpreter_slack = TRUE;
1199
1200 acpi_permanent_mmap = true;
1201
1202#ifdef CONFIG_X86
1203 /*
1204 * If the machine falls into the DMI check table,
1205 * DSDT will be copied to memory.
1206 * Note that calling dmi_check_system() here on other architectures
1207 * would not be OK because only x86 initializes dmi early enough.
1208 * Thankfully only x86 systems need such quirks for now.
1209 */
1210 dmi_check_system(list: dsdt_dmi_table);
1211#endif
1212
1213 status = acpi_reallocate_root_table();
1214 if (ACPI_FAILURE(status)) {
1215 pr_err("Unable to reallocate ACPI tables\n");
1216 goto error0;
1217 }
1218
1219 status = acpi_initialize_subsystem();
1220 if (ACPI_FAILURE(status)) {
1221 pr_err("Unable to initialize the ACPI Interpreter\n");
1222 goto error0;
1223 }
1224
1225#ifdef CONFIG_X86
1226 if (!acpi_ioapic) {
1227 /* compatible (0) means level (3) */
1228 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1229 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1230 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1231 }
1232 /* Set PIC-mode SCI trigger type */
1233 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1234 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1235 } else {
1236 /*
1237 * now that acpi_gbl_FADT is initialized,
1238 * update it with result from INT_SRC_OVR parsing
1239 */
1240 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1241 }
1242#endif
1243 return;
1244
1245 error0:
1246 disable_acpi();
1247}
1248
1249/**
1250 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1251 *
1252 * Switch over the platform to the ACPI mode (if possible).
1253 *
1254 * Doing this too early is generally unsafe, but at the same time it needs to be
1255 * done before all things that really depend on ACPI. The right spot appears to
1256 * be before finalizing the EFI initialization.
1257 */
1258void __init acpi_subsystem_init(void)
1259{
1260 acpi_status status;
1261
1262 if (acpi_disabled)
1263 return;
1264
1265 status = acpi_enable_subsystem(flags: ~ACPI_NO_ACPI_ENABLE);
1266 if (ACPI_FAILURE(status)) {
1267 pr_err("Unable to enable ACPI\n");
1268 disable_acpi();
1269 } else {
1270 /*
1271 * If the system is using ACPI then we can be reasonably
1272 * confident that any regulators are managed by the firmware
1273 * so tell the regulator core it has everything it needs to
1274 * know.
1275 */
1276 regulator_has_full_constraints();
1277 }
1278}
1279
1280static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1281{
1282 if (event == ACPI_TABLE_EVENT_LOAD)
1283 acpi_scan_table_notify();
1284
1285 return acpi_sysfs_table_handler(event, table, context);
1286}
1287
1288static int __init acpi_bus_init(void)
1289{
1290 int result;
1291 acpi_status status;
1292
1293 acpi_os_initialize1();
1294
1295 status = acpi_load_tables();
1296 if (ACPI_FAILURE(status)) {
1297 pr_err("Unable to load the System Description Tables\n");
1298 goto error1;
1299 }
1300
1301 /*
1302 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1303 * device is found in the namespace.
1304 *
1305 * This is accomplished by looking for the ECDT table and getting the EC
1306 * parameters out of that.
1307 *
1308 * Do that before calling acpi_initialize_objects() which may trigger EC
1309 * address space accesses.
1310 */
1311 acpi_ec_ecdt_probe();
1312
1313 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1314 if (ACPI_FAILURE(status)) {
1315 pr_err("Unable to start the ACPI Interpreter\n");
1316 goto error1;
1317 }
1318
1319 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1320 if (ACPI_FAILURE(status)) {
1321 pr_err("Unable to initialize ACPI objects\n");
1322 goto error1;
1323 }
1324
1325 /*
1326 * _OSC method may exist in module level code,
1327 * so it must be run after ACPI_FULL_INITIALIZATION
1328 */
1329 acpi_bus_osc_negotiate_platform_control();
1330 acpi_bus_osc_negotiate_usb_control();
1331
1332 /*
1333 * _PDC control method may load dynamic SSDT tables,
1334 * and we need to install the table handler before that.
1335 */
1336 status = acpi_install_table_handler(handler: acpi_bus_table_handler, NULL);
1337
1338 acpi_sysfs_init();
1339
1340 acpi_early_processor_control_setup();
1341
1342 /*
1343 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1344 * is necessary to enable it as early as possible.
1345 */
1346 acpi_ec_dsdt_probe();
1347
1348 pr_info("Interpreter enabled\n");
1349
1350 /* Initialize sleep structures */
1351 acpi_sleep_init();
1352
1353 /*
1354 * Get the system interrupt model and evaluate \_PIC.
1355 */
1356 result = acpi_bus_init_irq();
1357 if (result)
1358 goto error1;
1359
1360 /*
1361 * Register the for all standard device notifications.
1362 */
1363 status =
1364 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1365 handler: &acpi_bus_notify, NULL);
1366 if (ACPI_FAILURE(status)) {
1367 pr_err("Unable to register for system notifications\n");
1368 goto error1;
1369 }
1370
1371 /*
1372 * Create the top ACPI proc directory
1373 */
1374 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1375
1376 result = bus_register(bus: &acpi_bus_type);
1377 if (!result)
1378 return 0;
1379
1380 /* Mimic structured exception handling */
1381 error1:
1382 acpi_terminate();
1383 return -ENODEV;
1384}
1385
1386struct kobject *acpi_kobj;
1387EXPORT_SYMBOL_GPL(acpi_kobj);
1388
1389static int __init acpi_init(void)
1390{
1391 int result;
1392
1393 if (acpi_disabled) {
1394 pr_info("Interpreter disabled.\n");
1395 return -ENODEV;
1396 }
1397
1398 acpi_kobj = kobject_create_and_add(name: "acpi", parent: firmware_kobj);
1399 if (!acpi_kobj)
1400 pr_debug("%s: kset create error\n", __func__);
1401
1402 init_prmt();
1403 acpi_init_pcc();
1404 result = acpi_bus_init();
1405 if (result) {
1406 kobject_put(kobj: acpi_kobj);
1407 disable_acpi();
1408 return result;
1409 }
1410 acpi_init_ffh();
1411
1412 pci_mmcfg_late_init();
1413 acpi_viot_early_init();
1414 acpi_hest_init();
1415 acpi_ghes_init();
1416 acpi_arm_init();
1417 acpi_scan_init();
1418 acpi_ec_init();
1419 acpi_debugfs_init();
1420 acpi_sleep_proc_init();
1421 acpi_wakeup_device_init();
1422 acpi_debugger_init();
1423 acpi_setup_sb_notify_handler();
1424 acpi_viot_init();
1425 return 0;
1426}
1427
1428subsys_initcall(acpi_init);
1429

source code of linux/drivers/acpi/bus.c