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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, "_STA", NULL, 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(device, &sta)) {
101 acpi_set_device_status(device, sta);
102 return 0;
103 }
104
105 /* Battery devices must have their deps met before calling _STA */
106 if (acpi_device_is_battery(device) && device->dep_unmet) {
107 acpi_set_device_status(device, 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 if (!device->status.present && device->status.enabled) {
116 pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n",
117 device->pnp.bus_id, (u32)sta);
118 device->status.enabled = 0;
119 /*
120 * The status is clearly invalid, so clear the functional bit as
121 * well to avoid attempting to use the device.
122 */
123 device->status.functional = 0;
124 }
125
126 acpi_set_device_status(device, sta);
127
128 if (device->status.functional && !device->status.present) {
129 pr_debug("Device [%s] status [%08x]: functional but not present\n",
130 device->pnp.bus_id, (u32)sta);
131 }
132
133 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
134 return 0;
135}
136EXPORT_SYMBOL(acpi_bus_get_status);
137
138void acpi_bus_private_data_handler(acpi_handle handle,
139 void *context)
140{
141 return;
142}
143EXPORT_SYMBOL(acpi_bus_private_data_handler);
144
145int acpi_bus_attach_private_data(acpi_handle handle, void *data)
146{
147 acpi_status status;
148
149 status = acpi_attach_data(handle,
150 acpi_bus_private_data_handler, data);
151 if (ACPI_FAILURE(status)) {
152 acpi_handle_debug(handle, "Error attaching device data\n");
153 return -ENODEV;
154 }
155
156 return 0;
157}
158EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
159
160int acpi_bus_get_private_data(acpi_handle handle, void **data)
161{
162 acpi_status status;
163
164 if (!data)
165 return -EINVAL;
166
167 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
168 if (ACPI_FAILURE(status)) {
169 acpi_handle_debug(handle, "No context for object\n");
170 return -ENODEV;
171 }
172
173 return 0;
174}
175EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
176
177void acpi_bus_detach_private_data(acpi_handle handle)
178{
179 acpi_detach_data(handle, acpi_bus_private_data_handler);
180}
181EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
182
183static void acpi_print_osc_error(acpi_handle handle,
184 struct acpi_osc_context *context, char *error)
185{
186 int i;
187
188 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
189
190 pr_debug("_OSC request data:");
191 for (i = 0; i < context->cap.length; i += sizeof(u32))
192 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
193
194 pr_debug("\n");
195}
196
197acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
198{
199 acpi_status status;
200 struct acpi_object_list input;
201 union acpi_object in_params[4];
202 union acpi_object *out_obj;
203 guid_t guid;
204 u32 errors;
205 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
206
207 if (!context)
208 return AE_ERROR;
209 if (guid_parse(context->uuid_str, &guid))
210 return AE_ERROR;
211 context->ret.length = ACPI_ALLOCATE_BUFFER;
212 context->ret.pointer = NULL;
213
214 /* Setting up input parameters */
215 input.count = 4;
216 input.pointer = in_params;
217 in_params[0].type = ACPI_TYPE_BUFFER;
218 in_params[0].buffer.length = 16;
219 in_params[0].buffer.pointer = (u8 *)&guid;
220 in_params[1].type = ACPI_TYPE_INTEGER;
221 in_params[1].integer.value = context->rev;
222 in_params[2].type = ACPI_TYPE_INTEGER;
223 in_params[2].integer.value = context->cap.length/sizeof(u32);
224 in_params[3].type = ACPI_TYPE_BUFFER;
225 in_params[3].buffer.length = context->cap.length;
226 in_params[3].buffer.pointer = context->cap.pointer;
227
228 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
229 if (ACPI_FAILURE(status))
230 return status;
231
232 if (!output.length)
233 return AE_NULL_OBJECT;
234
235 out_obj = output.pointer;
236 if (out_obj->type != ACPI_TYPE_BUFFER
237 || out_obj->buffer.length != context->cap.length) {
238 acpi_print_osc_error(handle, context,
239 "_OSC evaluation returned wrong type");
240 status = AE_TYPE;
241 goto out_kfree;
242 }
243 /* Need to ignore the bit0 in result code */
244 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
245 if (errors) {
246 if (errors & OSC_REQUEST_ERROR)
247 acpi_print_osc_error(handle, context,
248 "_OSC request failed");
249 if (errors & OSC_INVALID_UUID_ERROR)
250 acpi_print_osc_error(handle, context,
251 "_OSC invalid UUID");
252 if (errors & OSC_INVALID_REVISION_ERROR)
253 acpi_print_osc_error(handle, context,
254 "_OSC invalid revision");
255 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
256 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
257 & OSC_QUERY_ENABLE)
258 goto out_success;
259 status = AE_SUPPORT;
260 goto out_kfree;
261 }
262 status = AE_ERROR;
263 goto out_kfree;
264 }
265out_success:
266 context->ret.length = out_obj->buffer.length;
267 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
268 context->ret.length, GFP_KERNEL);
269 if (!context->ret.pointer) {
270 status = AE_NO_MEMORY;
271 goto out_kfree;
272 }
273 status = AE_OK;
274
275out_kfree:
276 kfree(output.pointer);
277 return status;
278}
279EXPORT_SYMBOL(acpi_run_osc);
280
281bool osc_sb_apei_support_acked;
282
283/*
284 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
285 * OSPM supports platform coordinated low power idle(LPI) states
286 */
287bool osc_pc_lpi_support_confirmed;
288EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
289
290/*
291 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
292 * Starting with ACPI Specification 6.2, all _CPC registers can be in
293 * PCC, System Memory, System IO, or Functional Fixed Hardware address
294 * spaces. OSPM support for this more flexible register space scheme is
295 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
296 *
297 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
298 * - PCC or Functional Fixed Hardware address space if defined
299 * - SystemMemory address space (NULL register) if not defined
300 */
301bool osc_cpc_flexible_adr_space_confirmed;
302EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
303
304/*
305 * ACPI 6.4 Operating System Capabilities for USB.
306 */
307bool osc_sb_native_usb4_support_confirmed;
308EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
309
310bool osc_sb_cppc2_support_acked;
311
312static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
313static void acpi_bus_osc_negotiate_platform_control(void)
314{
315 u32 capbuf[2], *capbuf_ret;
316 struct acpi_osc_context context = {
317 .uuid_str = sb_uuid_str,
318 .rev = 1,
319 .cap.length = 8,
320 .cap.pointer = capbuf,
321 };
322 acpi_handle handle;
323
324 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
325 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
326 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
328 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
329 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
330 if (IS_ENABLED(CONFIG_ACPI_THERMAL))
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
332 if (IS_ENABLED(CONFIG_ACPI_BATTERY))
333 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT;
334
335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
337 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_OVER_16_PSTATES_SUPPORT;
338 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GED_SUPPORT;
339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT;
340 if (IS_ENABLED(CONFIG_ACPI_PRMT))
341 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
342 if (IS_ENABLED(CONFIG_ACPI_FFH))
343 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
344
345#ifdef CONFIG_ARM64
346 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
347#endif
348#ifdef CONFIG_X86
349 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
350#endif
351
352#ifdef CONFIG_ACPI_CPPC_LIB
353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
354 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
355#endif
356
357 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
358
359 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
360 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
361
362 if (IS_ENABLED(CONFIG_USB4))
363 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
364
365 if (!ghes_disable)
366 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
367 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
368 return;
369
370 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
371 return;
372
373 capbuf_ret = context.ret.pointer;
374 if (context.ret.length <= OSC_SUPPORT_DWORD) {
375 kfree(context.ret.pointer);
376 return;
377 }
378
379 /*
380 * Now run _OSC again with query flag clear and with the caps
381 * supported by both the OS and the platform.
382 */
383 capbuf[OSC_QUERY_DWORD] = 0;
384 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
385 kfree(context.ret.pointer);
386
387 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
388 return;
389
390 capbuf_ret = context.ret.pointer;
391 if (context.ret.length > OSC_SUPPORT_DWORD) {
392#ifdef CONFIG_ACPI_CPPC_LIB
393 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
394#endif
395
396 osc_sb_apei_support_acked =
397 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
398 osc_pc_lpi_support_confirmed =
399 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
400 osc_sb_native_usb4_support_confirmed =
401 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
402 osc_cpc_flexible_adr_space_confirmed =
403 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
404 }
405
406 kfree(context.ret.pointer);
407}
408
409/*
410 * Native control of USB4 capabilities. If any of the tunneling bits is
411 * set it means OS is in control and we use software based connection
412 * manager.
413 */
414u32 osc_sb_native_usb4_control;
415EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
416
417static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
418{
419 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
420 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
421 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
422 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
423 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
424}
425
426static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
427static void acpi_bus_osc_negotiate_usb_control(void)
428{
429 u32 capbuf[3], *capbuf_ret;
430 struct acpi_osc_context context = {
431 .uuid_str = sb_usb_uuid_str,
432 .rev = 1,
433 .cap.length = sizeof(capbuf),
434 .cap.pointer = capbuf,
435 };
436 acpi_handle handle;
437 acpi_status status;
438 u32 control;
439
440 if (!osc_sb_native_usb4_support_confirmed)
441 return;
442
443 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
444 return;
445
446 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
447 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
448
449 /*
450 * Run _OSC first with query bit set, trying to get control over
451 * all tunneling. The platform can then clear out bits in the
452 * control dword that it does not want to grant to the OS.
453 */
454 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
455 capbuf[OSC_SUPPORT_DWORD] = 0;
456 capbuf[OSC_CONTROL_DWORD] = control;
457
458 status = acpi_run_osc(handle, &context);
459 if (ACPI_FAILURE(status))
460 return;
461
462 if (context.ret.length != sizeof(capbuf)) {
463 pr_info("USB4 _OSC: returned invalid length buffer\n");
464 goto out_free;
465 }
466
467 /*
468 * Run _OSC again now with query bit clear and the control dword
469 * matching what the platform granted (which may not have all
470 * the control bits set).
471 */
472 capbuf_ret = context.ret.pointer;
473
474 capbuf[OSC_QUERY_DWORD] = 0;
475 capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];
476
477 kfree(context.ret.pointer);
478
479 status = acpi_run_osc(handle, &context);
480 if (ACPI_FAILURE(status))
481 return;
482
483 if (context.ret.length != sizeof(capbuf)) {
484 pr_info("USB4 _OSC: returned invalid length buffer\n");
485 goto out_free;
486 }
487
488 osc_sb_native_usb4_control =
489 control & acpi_osc_ctx_get_pci_control(&context);
490
491 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
492 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
493 osc_sb_native_usb4_control);
494
495out_free:
496 kfree(context.ret.pointer);
497}
498
499/* --------------------------------------------------------------------------
500 Notification Handling
501 -------------------------------------------------------------------------- */
502
503/**
504 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
505 * @handle: Target ACPI object.
506 * @type: Notification type.
507 * @data: Ignored.
508 *
509 * This only handles notifications related to device hotplug.
510 */
511static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
512{
513 struct acpi_device *adev;
514
515 switch (type) {
516 case ACPI_NOTIFY_BUS_CHECK:
517 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
518 break;
519
520 case ACPI_NOTIFY_DEVICE_CHECK:
521 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
522 break;
523
524 case ACPI_NOTIFY_DEVICE_WAKE:
525 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
526 return;
527
528 case ACPI_NOTIFY_EJECT_REQUEST:
529 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
530 break;
531
532 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
533 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
534 /* TBD: Exactly what does 'light' mean? */
535 return;
536
537 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
538 acpi_handle_err(handle, "Device cannot be configured due "
539 "to a frequency mismatch\n");
540 return;
541
542 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
543 acpi_handle_err(handle, "Device cannot be configured due "
544 "to a bus mode mismatch\n");
545 return;
546
547 case ACPI_NOTIFY_POWER_FAULT:
548 acpi_handle_err(handle, "Device has suffered a power fault\n");
549 return;
550
551 default:
552 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
553 return;
554 }
555
556 adev = acpi_get_acpi_dev(handle);
557
558 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
559 return;
560
561 acpi_put_acpi_dev(adev);
562
563 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
564}
565
566static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
567{
568 struct acpi_device *device = data;
569 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
570
571 acpi_drv->ops.notify(device, event);
572}
573
574static int acpi_device_install_notify_handler(struct acpi_device *device,
575 struct acpi_driver *acpi_drv)
576{
577 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
578 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
579 acpi_status status;
580
581 status = acpi_install_notify_handler(device->handle, type,
582 acpi_notify_device, device);
583 if (ACPI_FAILURE(status))
584 return -EINVAL;
585
586 return 0;
587}
588
589static void acpi_device_remove_notify_handler(struct acpi_device *device,
590 struct acpi_driver *acpi_drv)
591{
592 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
593 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
594
595 acpi_remove_notify_handler(device->handle, type,
596 acpi_notify_device);
597
598 acpi_os_wait_events_complete();
599}
600
601int acpi_dev_install_notify_handler(struct acpi_device *adev,
602 u32 handler_type,
603 acpi_notify_handler handler, void *context)
604{
605 acpi_status status;
606
607 status = acpi_install_notify_handler(adev->handle, handler_type,
608 handler, context);
609 if (ACPI_FAILURE(status))
610 return -ENODEV;
611
612 return 0;
613}
614EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);
615
616void acpi_dev_remove_notify_handler(struct acpi_device *adev,
617 u32 handler_type,
618 acpi_notify_handler handler)
619{
620 acpi_remove_notify_handler(adev->handle, handler_type, handler);
621 acpi_os_wait_events_complete();
622}
623EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);
624
625/* Handle events targeting \_SB device (at present only graceful shutdown) */
626
627#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
628#define ACPI_SB_INDICATE_INTERVAL 10000
629
630static void sb_notify_work(struct work_struct *dummy)
631{
632 acpi_handle sb_handle;
633
634 orderly_poweroff(true);
635
636 /*
637 * After initiating graceful shutdown, the ACPI spec requires OSPM
638 * to evaluate _OST method once every 10seconds to indicate that
639 * the shutdown is in progress
640 */
641 acpi_get_handle(NULL, "\\_SB", &sb_handle);
642 while (1) {
643 pr_info("Graceful shutdown in progress.\n");
644 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
645 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
646 msleep(ACPI_SB_INDICATE_INTERVAL);
647 }
648}
649
650static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
651{
652 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
653
654 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
655 if (!work_busy(&acpi_sb_work))
656 schedule_work(&acpi_sb_work);
657 } else {
658 pr_warn("event %x is not supported by \\_SB device\n", event);
659 }
660}
661
662static int __init acpi_setup_sb_notify_handler(void)
663{
664 acpi_handle sb_handle;
665
666 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
667 return -ENXIO;
668
669 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
670 acpi_sb_notify, NULL)))
671 return -EINVAL;
672
673 return 0;
674}
675
676/* --------------------------------------------------------------------------
677 Device Matching
678 -------------------------------------------------------------------------- */
679
680/**
681 * acpi_get_first_physical_node - Get first physical node of an ACPI device
682 * @adev: ACPI device in question
683 *
684 * Return: First physical node of ACPI device @adev
685 */
686struct device *acpi_get_first_physical_node(struct acpi_device *adev)
687{
688 struct mutex *physical_node_lock = &adev->physical_node_lock;
689 struct device *phys_dev;
690
691 mutex_lock(physical_node_lock);
692 if (list_empty(&adev->physical_node_list)) {
693 phys_dev = NULL;
694 } else {
695 const struct acpi_device_physical_node *node;
696
697 node = list_first_entry(&adev->physical_node_list,
698 struct acpi_device_physical_node, node);
699
700 phys_dev = node->dev;
701 }
702 mutex_unlock(physical_node_lock);
703 return phys_dev;
704}
705EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
706
707static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
708 const struct device *dev)
709{
710 const struct device *phys_dev = acpi_get_first_physical_node(adev);
711
712 return phys_dev && phys_dev == dev ? adev : NULL;
713}
714
715/**
716 * acpi_device_is_first_physical_node - Is given dev first physical node
717 * @adev: ACPI companion device
718 * @dev: Physical device to check
719 *
720 * Function checks if given @dev is the first physical devices attached to
721 * the ACPI companion device. This distinction is needed in some cases
722 * where the same companion device is shared between many physical devices.
723 *
724 * Note that the caller have to provide valid @adev pointer.
725 */
726bool acpi_device_is_first_physical_node(struct acpi_device *adev,
727 const struct device *dev)
728{
729 return !!acpi_primary_dev_companion(adev, dev);
730}
731
732/*
733 * acpi_companion_match() - Can we match via ACPI companion device
734 * @dev: Device in question
735 *
736 * Check if the given device has an ACPI companion and if that companion has
737 * a valid list of PNP IDs, and if the device is the first (primary) physical
738 * device associated with it. Return the companion pointer if that's the case
739 * or NULL otherwise.
740 *
741 * If multiple physical devices are attached to a single ACPI companion, we need
742 * to be careful. The usage scenario for this kind of relationship is that all
743 * of the physical devices in question use resources provided by the ACPI
744 * companion. A typical case is an MFD device where all the sub-devices share
745 * the parent's ACPI companion. In such cases we can only allow the primary
746 * (first) physical device to be matched with the help of the companion's PNP
747 * IDs.
748 *
749 * Additional physical devices sharing the ACPI companion can still use
750 * resources available from it but they will be matched normally using functions
751 * provided by their bus types (and analogously for their modalias).
752 */
753const struct acpi_device *acpi_companion_match(const struct device *dev)
754{
755 struct acpi_device *adev;
756
757 adev = ACPI_COMPANION(dev);
758 if (!adev)
759 return NULL;
760
761 if (list_empty(&adev->pnp.ids))
762 return NULL;
763
764 return acpi_primary_dev_companion(adev, dev);
765}
766
767/**
768 * acpi_of_match_device - Match device object using the "compatible" property.
769 * @adev: ACPI device object to match.
770 * @of_match_table: List of device IDs to match against.
771 * @of_id: OF ID if matched
772 *
773 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
774 * identifiers and a _DSD object with the "compatible" property, use that
775 * property to match against the given list of identifiers.
776 */
777static bool acpi_of_match_device(const struct acpi_device *adev,
778 const struct of_device_id *of_match_table,
779 const struct of_device_id **of_id)
780{
781 const union acpi_object *of_compatible, *obj;
782 int i, nval;
783
784 if (!adev)
785 return false;
786
787 of_compatible = adev->data.of_compatible;
788 if (!of_match_table || !of_compatible)
789 return false;
790
791 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
792 nval = of_compatible->package.count;
793 obj = of_compatible->package.elements;
794 } else { /* Must be ACPI_TYPE_STRING. */
795 nval = 1;
796 obj = of_compatible;
797 }
798 /* Now we can look for the driver DT compatible strings */
799 for (i = 0; i < nval; i++, obj++) {
800 const struct of_device_id *id;
801
802 for (id = of_match_table; id->compatible[0]; id++)
803 if (!strcasecmp(obj->string.pointer, id->compatible)) {
804 if (of_id)
805 *of_id = id;
806 return true;
807 }
808 }
809
810 return false;
811}
812
813static bool acpi_of_modalias(struct acpi_device *adev,
814 char *modalias, size_t len)
815{
816 const union acpi_object *of_compatible;
817 const union acpi_object *obj;
818 const char *str, *chr;
819
820 of_compatible = adev->data.of_compatible;
821 if (!of_compatible)
822 return false;
823
824 if (of_compatible->type == ACPI_TYPE_PACKAGE)
825 obj = of_compatible->package.elements;
826 else /* Must be ACPI_TYPE_STRING. */
827 obj = of_compatible;
828
829 str = obj->string.pointer;
830 chr = strchr(str, ',');
831 strscpy(modalias, chr ? chr + 1 : str, len);
832
833 return true;
834}
835
836/**
837 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
838 * @adev: ACPI device object to match
839 * @default_id: ID string to use as default if no compatible string found
840 * @modalias: Pointer to buffer that modalias value will be copied into
841 * @len: Length of modalias buffer
842 *
843 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
844 * objects. If there is a compatible string for @adev, it will be copied to
845 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
846 * used.
847 */
848void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
849 char *modalias, size_t len)
850{
851 if (!acpi_of_modalias(adev, modalias, len))
852 strscpy(modalias, default_id, len);
853}
854EXPORT_SYMBOL_GPL(acpi_set_modalias);
855
856static bool __acpi_match_device_cls(const struct acpi_device_id *id,
857 struct acpi_hardware_id *hwid)
858{
859 int i, msk, byte_shift;
860 char buf[3];
861
862 if (!id->cls)
863 return false;
864
865 /* Apply class-code bitmask, before checking each class-code byte */
866 for (i = 1; i <= 3; i++) {
867 byte_shift = 8 * (3 - i);
868 msk = (id->cls_msk >> byte_shift) & 0xFF;
869 if (!msk)
870 continue;
871
872 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
873 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
874 return false;
875 }
876 return true;
877}
878
879static bool __acpi_match_device(const struct acpi_device *device,
880 const struct acpi_device_id *acpi_ids,
881 const struct of_device_id *of_ids,
882 const struct acpi_device_id **acpi_id,
883 const struct of_device_id **of_id)
884{
885 const struct acpi_device_id *id;
886 struct acpi_hardware_id *hwid;
887
888 /*
889 * If the device is not present, it is unnecessary to load device
890 * driver for it.
891 */
892 if (!device || !device->status.present)
893 return false;
894
895 list_for_each_entry(hwid, &device->pnp.ids, list) {
896 /* First, check the ACPI/PNP IDs provided by the caller. */
897 if (acpi_ids) {
898 for (id = acpi_ids; id->id[0] || id->cls; id++) {
899 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
900 goto out_acpi_match;
901 if (id->cls && __acpi_match_device_cls(id, hwid))
902 goto out_acpi_match;
903 }
904 }
905
906 /*
907 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
908 * "compatible" property if found.
909 */
910 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
911 return acpi_of_match_device(device, of_ids, of_id);
912 }
913 return false;
914
915out_acpi_match:
916 if (acpi_id)
917 *acpi_id = id;
918 return true;
919}
920
921/**
922 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
923 * @ids: Array of struct acpi_device_id objects to match against.
924 * @adev: The ACPI device pointer to match.
925 *
926 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
927 *
928 * Return:
929 * a pointer to the first matching ACPI ID on success or %NULL on failure.
930 */
931const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
932 const struct acpi_device *adev)
933{
934 const struct acpi_device_id *id = NULL;
935
936 __acpi_match_device(adev, ids, NULL, &id, NULL);
937 return id;
938}
939EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
940
941/**
942 * acpi_match_device - Match a struct device against a given list of ACPI IDs
943 * @ids: Array of struct acpi_device_id object to match against.
944 * @dev: The device structure to match.
945 *
946 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
947 * object for that handle and use that object to match against a given list of
948 * device IDs.
949 *
950 * Return a pointer to the first matching ID on success or %NULL on failure.
951 */
952const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
953 const struct device *dev)
954{
955 return acpi_match_acpi_device(ids, acpi_companion_match(dev));
956}
957EXPORT_SYMBOL_GPL(acpi_match_device);
958
959static const void *acpi_of_device_get_match_data(const struct device *dev)
960{
961 struct acpi_device *adev = ACPI_COMPANION(dev);
962 const struct of_device_id *match = NULL;
963
964 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
965 return NULL;
966
967 return match->data;
968}
969
970const void *acpi_device_get_match_data(const struct device *dev)
971{
972 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
973 const struct acpi_device_id *match;
974
975 if (!acpi_ids)
976 return acpi_of_device_get_match_data(dev);
977
978 match = acpi_match_device(acpi_ids, dev);
979 if (!match)
980 return NULL;
981
982 return (const void *)match->driver_data;
983}
984EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
985
986int acpi_match_device_ids(struct acpi_device *device,
987 const struct acpi_device_id *ids)
988{
989 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
990}
991EXPORT_SYMBOL(acpi_match_device_ids);
992
993bool acpi_driver_match_device(struct device *dev,
994 const struct device_driver *drv)
995{
996 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
997 const struct of_device_id *of_ids = drv->of_match_table;
998
999 if (!acpi_ids)
1000 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
1001
1002 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
1003}
1004EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1005
1006/* --------------------------------------------------------------------------
1007 ACPI Driver Management
1008 -------------------------------------------------------------------------- */
1009
1010/**
1011 * __acpi_bus_register_driver - register a driver with the ACPI bus
1012 * @driver: driver being registered
1013 * @owner: owning module/driver
1014 *
1015 * Registers a driver with the ACPI bus. Searches the namespace for all
1016 * devices that match the driver's criteria and binds. Returns zero for
1017 * success or a negative error status for failure.
1018 */
1019int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner)
1020{
1021 if (acpi_disabled)
1022 return -ENODEV;
1023 driver->drv.name = driver->name;
1024 driver->drv.bus = &acpi_bus_type;
1025 driver->drv.owner = owner;
1026
1027 return driver_register(&driver->drv);
1028}
1029
1030EXPORT_SYMBOL(__acpi_bus_register_driver);
1031
1032/**
1033 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1034 * @driver: driver to unregister
1035 *
1036 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1037 * devices that match the driver's criteria and unbinds.
1038 */
1039void acpi_bus_unregister_driver(struct acpi_driver *driver)
1040{
1041 driver_unregister(&driver->drv);
1042}
1043
1044EXPORT_SYMBOL(acpi_bus_unregister_driver);
1045
1046/* --------------------------------------------------------------------------
1047 ACPI Bus operations
1048 -------------------------------------------------------------------------- */
1049
1050static int acpi_bus_match(struct device *dev, const struct device_driver *drv)
1051{
1052 struct acpi_device *acpi_dev = to_acpi_device(dev);
1053 const struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1054
1055 return acpi_dev->flags.match_driver
1056 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1057}
1058
1059static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
1060{
1061 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1062}
1063
1064static int acpi_device_probe(struct device *dev)
1065{
1066 struct acpi_device *acpi_dev = to_acpi_device(dev);
1067 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1068 int ret;
1069
1070 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1071 return -EINVAL;
1072
1073 if (!acpi_drv->ops.add)
1074 return -ENOSYS;
1075
1076 ret = acpi_drv->ops.add(acpi_dev);
1077 if (ret) {
1078 acpi_dev->driver_data = NULL;
1079 return ret;
1080 }
1081
1082 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1083 acpi_drv->name, acpi_dev->pnp.bus_id);
1084
1085 if (acpi_drv->ops.notify) {
1086 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1087 if (ret) {
1088 if (acpi_drv->ops.remove)
1089 acpi_drv->ops.remove(acpi_dev);
1090
1091 acpi_dev->driver_data = NULL;
1092 return ret;
1093 }
1094 }
1095
1096 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1097 acpi_dev->pnp.bus_id);
1098
1099 get_device(dev);
1100 return 0;
1101}
1102
1103static void acpi_device_remove(struct device *dev)
1104{
1105 struct acpi_device *acpi_dev = to_acpi_device(dev);
1106 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1107
1108 if (acpi_drv->ops.notify)
1109 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1110
1111 if (acpi_drv->ops.remove)
1112 acpi_drv->ops.remove(acpi_dev);
1113
1114 acpi_dev->driver_data = NULL;
1115
1116 put_device(dev);
1117}
1118
1119const struct bus_type acpi_bus_type = {
1120 .name = "acpi",
1121 .match = acpi_bus_match,
1122 .probe = acpi_device_probe,
1123 .remove = acpi_device_remove,
1124 .uevent = acpi_device_uevent,
1125};
1126
1127int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1128{
1129 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1130}
1131EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1132
1133struct acpi_dev_walk_context {
1134 int (*fn)(struct acpi_device *, void *);
1135 void *data;
1136};
1137
1138static int acpi_dev_for_one_check(struct device *dev, void *context)
1139{
1140 struct acpi_dev_walk_context *adwc = context;
1141
1142 if (dev->bus != &acpi_bus_type)
1143 return 0;
1144
1145 return adwc->fn(to_acpi_device(dev), adwc->data);
1146}
1147EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1148
1149int acpi_dev_for_each_child(struct acpi_device *adev,
1150 int (*fn)(struct acpi_device *, void *), void *data)
1151{
1152 struct acpi_dev_walk_context adwc = {
1153 .fn = fn,
1154 .data = data,
1155 };
1156
1157 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1158}
1159
1160int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1161 int (*fn)(struct acpi_device *, void *),
1162 void *data)
1163{
1164 struct acpi_dev_walk_context adwc = {
1165 .fn = fn,
1166 .data = data,
1167 };
1168
1169 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1170}
1171
1172/* --------------------------------------------------------------------------
1173 Initialization/Cleanup
1174 -------------------------------------------------------------------------- */
1175
1176static int __init acpi_bus_init_irq(void)
1177{
1178 acpi_status status;
1179 char *message = NULL;
1180
1181
1182 /*
1183 * Let the system know what interrupt model we are using by
1184 * evaluating the \_PIC object, if exists.
1185 */
1186
1187 switch (acpi_irq_model) {
1188 case ACPI_IRQ_MODEL_PIC:
1189 message = "PIC";
1190 break;
1191 case ACPI_IRQ_MODEL_IOAPIC:
1192 message = "IOAPIC";
1193 break;
1194 case ACPI_IRQ_MODEL_IOSAPIC:
1195 message = "IOSAPIC";
1196 break;
1197 case ACPI_IRQ_MODEL_GIC:
1198 message = "GIC";
1199 break;
1200 case ACPI_IRQ_MODEL_PLATFORM:
1201 message = "platform specific model";
1202 break;
1203 case ACPI_IRQ_MODEL_LPIC:
1204 message = "LPIC";
1205 break;
1206 case ACPI_IRQ_MODEL_RINTC:
1207 message = "RINTC";
1208 break;
1209 default:
1210 pr_info("Unknown interrupt routing model\n");
1211 return -ENODEV;
1212 }
1213
1214 pr_info("Using %s for interrupt routing\n", message);
1215
1216 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1217 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1218 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1219 return -ENODEV;
1220 }
1221
1222 return 0;
1223}
1224
1225/**
1226 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1227 *
1228 * The ACPI tables are accessible after this, but the handling of events has not
1229 * been initialized and the global lock is not available yet, so AML should not
1230 * be executed at this point.
1231 *
1232 * Doing this before switching the EFI runtime services to virtual mode allows
1233 * the EfiBootServices memory to be freed slightly earlier on boot.
1234 */
1235void __init acpi_early_init(void)
1236{
1237 acpi_status status;
1238
1239 if (acpi_disabled)
1240 return;
1241
1242 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1243
1244 /* enable workarounds, unless strict ACPI spec. compliance */
1245 if (!acpi_strict)
1246 acpi_gbl_enable_interpreter_slack = TRUE;
1247
1248 acpi_permanent_mmap = true;
1249
1250#ifdef CONFIG_X86
1251 /*
1252 * If the machine falls into the DMI check table,
1253 * DSDT will be copied to memory.
1254 * Note that calling dmi_check_system() here on other architectures
1255 * would not be OK because only x86 initializes dmi early enough.
1256 * Thankfully only x86 systems need such quirks for now.
1257 */
1258 dmi_check_system(dsdt_dmi_table);
1259#endif
1260
1261 status = acpi_reallocate_root_table();
1262 if (ACPI_FAILURE(status)) {
1263 pr_err("Unable to reallocate ACPI tables\n");
1264 goto error0;
1265 }
1266
1267 status = acpi_initialize_subsystem();
1268 if (ACPI_FAILURE(status)) {
1269 pr_err("Unable to initialize the ACPI Interpreter\n");
1270 goto error0;
1271 }
1272
1273#ifdef CONFIG_X86
1274 if (!acpi_ioapic) {
1275 /* compatible (0) means level (3) */
1276 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1277 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1278 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1279 }
1280 /* Set PIC-mode SCI trigger type */
1281 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1282 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1283 } else {
1284 /*
1285 * now that acpi_gbl_FADT is initialized,
1286 * update it with result from INT_SRC_OVR parsing
1287 */
1288 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1289 }
1290#endif
1291 return;
1292
1293 error0:
1294 disable_acpi();
1295}
1296
1297/**
1298 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1299 *
1300 * Switch over the platform to the ACPI mode (if possible).
1301 *
1302 * Doing this too early is generally unsafe, but at the same time it needs to be
1303 * done before all things that really depend on ACPI. The right spot appears to
1304 * be before finalizing the EFI initialization.
1305 */
1306void __init acpi_subsystem_init(void)
1307{
1308 acpi_status status;
1309
1310 if (acpi_disabled)
1311 return;
1312
1313 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1314 if (ACPI_FAILURE(status)) {
1315 pr_err("Unable to enable ACPI\n");
1316 disable_acpi();
1317 } else {
1318 /*
1319 * If the system is using ACPI then we can be reasonably
1320 * confident that any regulators are managed by the firmware
1321 * so tell the regulator core it has everything it needs to
1322 * know.
1323 */
1324 regulator_has_full_constraints();
1325 }
1326}
1327
1328static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1329{
1330 if (event == ACPI_TABLE_EVENT_LOAD)
1331 acpi_scan_table_notify();
1332
1333 return acpi_sysfs_table_handler(event, table, context);
1334}
1335
1336static int __init acpi_bus_init(void)
1337{
1338 int result;
1339 acpi_status status;
1340
1341 acpi_os_initialize1();
1342
1343 status = acpi_load_tables();
1344 if (ACPI_FAILURE(status)) {
1345 pr_err("Unable to load the System Description Tables\n");
1346 goto error1;
1347 }
1348
1349 /*
1350 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1351 * device is found in the namespace.
1352 *
1353 * This is accomplished by looking for the ECDT table and getting the EC
1354 * parameters out of that.
1355 *
1356 * Do that before calling acpi_initialize_objects() which may trigger EC
1357 * address space accesses.
1358 */
1359 acpi_ec_ecdt_probe();
1360
1361 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1362 if (ACPI_FAILURE(status)) {
1363 pr_err("Unable to start the ACPI Interpreter\n");
1364 goto error1;
1365 }
1366
1367 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1368 if (ACPI_FAILURE(status)) {
1369 pr_err("Unable to initialize ACPI objects\n");
1370 goto error1;
1371 }
1372
1373 /*
1374 * _OSC method may exist in module level code,
1375 * so it must be run after ACPI_FULL_INITIALIZATION
1376 */
1377 acpi_bus_osc_negotiate_platform_control();
1378 acpi_bus_osc_negotiate_usb_control();
1379
1380 /*
1381 * _PDC control method may load dynamic SSDT tables,
1382 * and we need to install the table handler before that.
1383 */
1384 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1385
1386 acpi_sysfs_init();
1387
1388 acpi_early_processor_control_setup();
1389
1390 /*
1391 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1392 * is necessary to enable it as early as possible.
1393 */
1394 acpi_ec_dsdt_probe();
1395
1396 pr_info("Interpreter enabled\n");
1397
1398 /* Initialize sleep structures */
1399 acpi_sleep_init();
1400
1401 /*
1402 * Get the system interrupt model and evaluate \_PIC.
1403 */
1404 result = acpi_bus_init_irq();
1405 if (result)
1406 goto error1;
1407
1408 /*
1409 * Register the for all standard device notifications.
1410 */
1411 status =
1412 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1413 &acpi_bus_notify, NULL);
1414 if (ACPI_FAILURE(status)) {
1415 pr_err("Unable to register for system notifications\n");
1416 goto error1;
1417 }
1418
1419 /*
1420 * Create the top ACPI proc directory
1421 */
1422 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1423
1424 result = bus_register(&acpi_bus_type);
1425 if (!result)
1426 return 0;
1427
1428 /* Mimic structured exception handling */
1429 error1:
1430 acpi_terminate();
1431 return -ENODEV;
1432}
1433
1434struct kobject *acpi_kobj;
1435EXPORT_SYMBOL_GPL(acpi_kobj);
1436
1437void __weak __init acpi_arch_init(void) { }
1438
1439static int __init acpi_init(void)
1440{
1441 int result;
1442
1443 if (acpi_disabled) {
1444 pr_info("Interpreter disabled.\n");
1445 return -ENODEV;
1446 }
1447
1448 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1449 if (!acpi_kobj)
1450 pr_debug("%s: kset create error\n", __func__);
1451
1452 init_prmt();
1453 acpi_init_pcc();
1454 result = acpi_bus_init();
1455 if (result) {
1456 kobject_put(acpi_kobj);
1457 disable_acpi();
1458 return result;
1459 }
1460 acpi_init_ffh();
1461
1462 pci_mmcfg_late_init();
1463 acpi_viot_early_init();
1464 acpi_hest_init();
1465 acpi_ghes_init();
1466 acpi_arch_init();
1467 acpi_scan_init();
1468 acpi_ec_init();
1469 acpi_debugfs_init();
1470 acpi_sleep_proc_init();
1471 acpi_wakeup_device_init();
1472 acpi_debugger_init();
1473 acpi_setup_sb_notify_handler();
1474 acpi_viot_init();
1475 return 0;
1476}
1477
1478subsys_initcall(acpi_init);
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 */
20
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/ioport.h>
24#include <linux/kernel.h>
25#include <linux/list.h>
26#include <linux/sched.h>
27#include <linux/pm.h>
28#include <linux/device.h>
29#include <linux/proc_fs.h>
30#include <linux/acpi.h>
31#include <linux/slab.h>
32#include <linux/regulator/machine.h>
33#include <linux/workqueue.h>
34#include <linux/reboot.h>
35#include <linux/delay.h>
36#ifdef CONFIG_X86
37#include <asm/mpspec.h>
38#endif
39#include <linux/acpi_iort.h>
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
69static int set_gbl_term_list(const struct dmi_system_id *id)
70{
71 acpi_gbl_execute_tables_as_methods = 1;
72 return 0;
73}
74
75static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
76 /*
77 * Touchpad on Dell XPS 9570/Precision M5530 doesn't work under I2C
78 * mode.
79 * https://bugzilla.kernel.org/show_bug.cgi?id=198515
80 */
81 {
82 .callback = set_gbl_term_list,
83 .ident = "Dell Precision M5530",
84 .matches = {
85 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
86 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M5530"),
87 },
88 },
89 {
90 .callback = set_gbl_term_list,
91 .ident = "Dell XPS 15 9570",
92 .matches = {
93 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
94 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
95 },
96 },
97 /*
98 * Invoke DSDT corruption work-around on all Toshiba Satellite.
99 * DSDT will be copied to memory.
100 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
101 */
102 {
103 .callback = set_copy_dsdt,
104 .ident = "TOSHIBA Satellite",
105 .matches = {
106 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
108 },
109 },
110 {}
111};
112#else
113static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
114 {}
115};
116#endif
117
118/* --------------------------------------------------------------------------
119 Device Management
120 -------------------------------------------------------------------------- */
121
122acpi_status acpi_bus_get_status_handle(acpi_handle handle,
123 unsigned long long *sta)
124{
125 acpi_status status;
126
127 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
128 if (ACPI_SUCCESS(status))
129 return AE_OK;
130
131 if (status == AE_NOT_FOUND) {
132 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
133 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
134 return AE_OK;
135 }
136 return status;
137}
138EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
139
140int acpi_bus_get_status(struct acpi_device *device)
141{
142 acpi_status status;
143 unsigned long long sta;
144
145 if (acpi_device_always_present(device)) {
146 acpi_set_device_status(device, ACPI_STA_DEFAULT);
147 return 0;
148 }
149
150 /* Battery devices must have their deps met before calling _STA */
151 if (acpi_device_is_battery(device) && device->dep_unmet) {
152 acpi_set_device_status(device, 0);
153 return 0;
154 }
155
156 status = acpi_bus_get_status_handle(device->handle, &sta);
157 if (ACPI_FAILURE(status))
158 return -ENODEV;
159
160 acpi_set_device_status(device, sta);
161
162 if (device->status.functional && !device->status.present) {
163 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
164 "functional but not present;\n",
165 device->pnp.bus_id, (u32)sta));
166 }
167
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
169 device->pnp.bus_id, (u32)sta));
170 return 0;
171}
172EXPORT_SYMBOL(acpi_bus_get_status);
173
174void acpi_bus_private_data_handler(acpi_handle handle,
175 void *context)
176{
177 return;
178}
179EXPORT_SYMBOL(acpi_bus_private_data_handler);
180
181int acpi_bus_attach_private_data(acpi_handle handle, void *data)
182{
183 acpi_status status;
184
185 status = acpi_attach_data(handle,
186 acpi_bus_private_data_handler, data);
187 if (ACPI_FAILURE(status)) {
188 acpi_handle_debug(handle, "Error attaching device data\n");
189 return -ENODEV;
190 }
191
192 return 0;
193}
194EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
195
196int acpi_bus_get_private_data(acpi_handle handle, void **data)
197{
198 acpi_status status;
199
200 if (!*data)
201 return -EINVAL;
202
203 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
204 if (ACPI_FAILURE(status)) {
205 acpi_handle_debug(handle, "No context for object\n");
206 return -ENODEV;
207 }
208
209 return 0;
210}
211EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
212
213void acpi_bus_detach_private_data(acpi_handle handle)
214{
215 acpi_detach_data(handle, acpi_bus_private_data_handler);
216}
217EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
218
219static void acpi_print_osc_error(acpi_handle handle,
220 struct acpi_osc_context *context, char *error)
221{
222 int i;
223
224 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
225
226 pr_debug("_OSC request data:");
227 for (i = 0; i < context->cap.length; i += sizeof(u32))
228 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
229
230 pr_debug("\n");
231}
232
233acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
234{
235 acpi_status status;
236 struct acpi_object_list input;
237 union acpi_object in_params[4];
238 union acpi_object *out_obj;
239 guid_t guid;
240 u32 errors;
241 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
242
243 if (!context)
244 return AE_ERROR;
245 if (guid_parse(context->uuid_str, &guid))
246 return AE_ERROR;
247 context->ret.length = ACPI_ALLOCATE_BUFFER;
248 context->ret.pointer = NULL;
249
250 /* Setting up input parameters */
251 input.count = 4;
252 input.pointer = in_params;
253 in_params[0].type = ACPI_TYPE_BUFFER;
254 in_params[0].buffer.length = 16;
255 in_params[0].buffer.pointer = (u8 *)&guid;
256 in_params[1].type = ACPI_TYPE_INTEGER;
257 in_params[1].integer.value = context->rev;
258 in_params[2].type = ACPI_TYPE_INTEGER;
259 in_params[2].integer.value = context->cap.length/sizeof(u32);
260 in_params[3].type = ACPI_TYPE_BUFFER;
261 in_params[3].buffer.length = context->cap.length;
262 in_params[3].buffer.pointer = context->cap.pointer;
263
264 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
265 if (ACPI_FAILURE(status))
266 return status;
267
268 if (!output.length)
269 return AE_NULL_OBJECT;
270
271 out_obj = output.pointer;
272 if (out_obj->type != ACPI_TYPE_BUFFER
273 || out_obj->buffer.length != context->cap.length) {
274 acpi_print_osc_error(handle, context,
275 "_OSC evaluation returned wrong type");
276 status = AE_TYPE;
277 goto out_kfree;
278 }
279 /* Need to ignore the bit0 in result code */
280 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
281 if (errors) {
282 if (errors & OSC_REQUEST_ERROR)
283 acpi_print_osc_error(handle, context,
284 "_OSC request failed");
285 if (errors & OSC_INVALID_UUID_ERROR)
286 acpi_print_osc_error(handle, context,
287 "_OSC invalid UUID");
288 if (errors & OSC_INVALID_REVISION_ERROR)
289 acpi_print_osc_error(handle, context,
290 "_OSC invalid revision");
291 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
292 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
293 & OSC_QUERY_ENABLE)
294 goto out_success;
295 status = AE_SUPPORT;
296 goto out_kfree;
297 }
298 status = AE_ERROR;
299 goto out_kfree;
300 }
301out_success:
302 context->ret.length = out_obj->buffer.length;
303 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
304 context->ret.length, GFP_KERNEL);
305 if (!context->ret.pointer) {
306 status = AE_NO_MEMORY;
307 goto out_kfree;
308 }
309 status = AE_OK;
310
311out_kfree:
312 kfree(output.pointer);
313 if (status != AE_OK)
314 context->ret.pointer = NULL;
315 return status;
316}
317EXPORT_SYMBOL(acpi_run_osc);
318
319bool osc_sb_apei_support_acked;
320
321/*
322 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
323 * OSPM supports platform coordinated low power idle(LPI) states
324 */
325bool osc_pc_lpi_support_confirmed;
326EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
327
328static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
329static void acpi_bus_osc_support(void)
330{
331 u32 capbuf[2];
332 struct acpi_osc_context context = {
333 .uuid_str = sb_uuid_str,
334 .rev = 1,
335 .cap.length = 8,
336 .cap.pointer = capbuf,
337 };
338 acpi_handle handle;
339
340 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
341 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
342 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
343 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
344 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
346
347 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
349
350#ifdef CONFIG_X86
351 if (boot_cpu_has(X86_FEATURE_HWP)) {
352 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
354 }
355#endif
356
357 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
358 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
359
360 if (!ghes_disable)
361 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
362 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
363 return;
364 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
365 u32 *capbuf_ret = context.ret.pointer;
366 if (context.ret.length > OSC_SUPPORT_DWORD) {
367 osc_sb_apei_support_acked =
368 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
369 osc_pc_lpi_support_confirmed =
370 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
371 }
372 kfree(context.ret.pointer);
373 }
374 /* do we need to check other returned cap? Sounds no */
375}
376
377/* --------------------------------------------------------------------------
378 Notification Handling
379 -------------------------------------------------------------------------- */
380
381/**
382 * acpi_bus_notify
383 * ---------------
384 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
385 */
386static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
387{
388 struct acpi_device *adev;
389 struct acpi_driver *driver;
390 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
391 bool hotplug_event = false;
392
393 switch (type) {
394 case ACPI_NOTIFY_BUS_CHECK:
395 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
396 hotplug_event = true;
397 break;
398
399 case ACPI_NOTIFY_DEVICE_CHECK:
400 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
401 hotplug_event = true;
402 break;
403
404 case ACPI_NOTIFY_DEVICE_WAKE:
405 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
406 break;
407
408 case ACPI_NOTIFY_EJECT_REQUEST:
409 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
410 hotplug_event = true;
411 break;
412
413 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
414 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
415 /* TBD: Exactly what does 'light' mean? */
416 break;
417
418 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
419 acpi_handle_err(handle, "Device cannot be configured due "
420 "to a frequency mismatch\n");
421 break;
422
423 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
424 acpi_handle_err(handle, "Device cannot be configured due "
425 "to a bus mode mismatch\n");
426 break;
427
428 case ACPI_NOTIFY_POWER_FAULT:
429 acpi_handle_err(handle, "Device has suffered a power fault\n");
430 break;
431
432 default:
433 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
434 break;
435 }
436
437 adev = acpi_bus_get_acpi_device(handle);
438 if (!adev)
439 goto err;
440
441 driver = adev->driver;
442 if (driver && driver->ops.notify &&
443 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
444 driver->ops.notify(adev, type);
445
446 if (!hotplug_event) {
447 acpi_bus_put_acpi_device(adev);
448 return;
449 }
450
451 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
452 return;
453
454 acpi_bus_put_acpi_device(adev);
455
456 err:
457 acpi_evaluate_ost(handle, type, ost_code, NULL);
458}
459
460static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
461{
462 struct acpi_device *device = data;
463
464 device->driver->ops.notify(device, event);
465}
466
467static void acpi_device_notify_fixed(void *data)
468{
469 struct acpi_device *device = data;
470
471 /* Fixed hardware devices have no handles */
472 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
473}
474
475static u32 acpi_device_fixed_event(void *data)
476{
477 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
478 return ACPI_INTERRUPT_HANDLED;
479}
480
481static int acpi_device_install_notify_handler(struct acpi_device *device)
482{
483 acpi_status status;
484
485 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
486 status =
487 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
488 acpi_device_fixed_event,
489 device);
490 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
491 status =
492 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
493 acpi_device_fixed_event,
494 device);
495 else
496 status = acpi_install_notify_handler(device->handle,
497 ACPI_DEVICE_NOTIFY,
498 acpi_device_notify,
499 device);
500
501 if (ACPI_FAILURE(status))
502 return -EINVAL;
503 return 0;
504}
505
506static void acpi_device_remove_notify_handler(struct acpi_device *device)
507{
508 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
509 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
510 acpi_device_fixed_event);
511 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
512 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
513 acpi_device_fixed_event);
514 else
515 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
516 acpi_device_notify);
517}
518
519/* Handle events targeting \_SB device (at present only graceful shutdown) */
520
521#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
522#define ACPI_SB_INDICATE_INTERVAL 10000
523
524static void sb_notify_work(struct work_struct *dummy)
525{
526 acpi_handle sb_handle;
527
528 orderly_poweroff(true);
529
530 /*
531 * After initiating graceful shutdown, the ACPI spec requires OSPM
532 * to evaluate _OST method once every 10seconds to indicate that
533 * the shutdown is in progress
534 */
535 acpi_get_handle(NULL, "\\_SB", &sb_handle);
536 while (1) {
537 pr_info("Graceful shutdown in progress.\n");
538 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
539 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
540 msleep(ACPI_SB_INDICATE_INTERVAL);
541 }
542}
543
544static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
545{
546 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
547
548 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
549 if (!work_busy(&acpi_sb_work))
550 schedule_work(&acpi_sb_work);
551 } else
552 pr_warn("event %x is not supported by \\_SB device\n", event);
553}
554
555static int __init acpi_setup_sb_notify_handler(void)
556{
557 acpi_handle sb_handle;
558
559 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
560 return -ENXIO;
561
562 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
563 acpi_sb_notify, NULL)))
564 return -EINVAL;
565
566 return 0;
567}
568
569/* --------------------------------------------------------------------------
570 Device Matching
571 -------------------------------------------------------------------------- */
572
573/**
574 * acpi_get_first_physical_node - Get first physical node of an ACPI device
575 * @adev: ACPI device in question
576 *
577 * Return: First physical node of ACPI device @adev
578 */
579struct device *acpi_get_first_physical_node(struct acpi_device *adev)
580{
581 struct mutex *physical_node_lock = &adev->physical_node_lock;
582 struct device *phys_dev;
583
584 mutex_lock(physical_node_lock);
585 if (list_empty(&adev->physical_node_list)) {
586 phys_dev = NULL;
587 } else {
588 const struct acpi_device_physical_node *node;
589
590 node = list_first_entry(&adev->physical_node_list,
591 struct acpi_device_physical_node, node);
592
593 phys_dev = node->dev;
594 }
595 mutex_unlock(physical_node_lock);
596 return phys_dev;
597}
598
599static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
600 const struct device *dev)
601{
602 const struct device *phys_dev = acpi_get_first_physical_node(adev);
603
604 return phys_dev && phys_dev == dev ? adev : NULL;
605}
606
607/**
608 * acpi_device_is_first_physical_node - Is given dev first physical node
609 * @adev: ACPI companion device
610 * @dev: Physical device to check
611 *
612 * Function checks if given @dev is the first physical devices attached to
613 * the ACPI companion device. This distinction is needed in some cases
614 * where the same companion device is shared between many physical devices.
615 *
616 * Note that the caller have to provide valid @adev pointer.
617 */
618bool acpi_device_is_first_physical_node(struct acpi_device *adev,
619 const struct device *dev)
620{
621 return !!acpi_primary_dev_companion(adev, dev);
622}
623
624/*
625 * acpi_companion_match() - Can we match via ACPI companion device
626 * @dev: Device in question
627 *
628 * Check if the given device has an ACPI companion and if that companion has
629 * a valid list of PNP IDs, and if the device is the first (primary) physical
630 * device associated with it. Return the companion pointer if that's the case
631 * or NULL otherwise.
632 *
633 * If multiple physical devices are attached to a single ACPI companion, we need
634 * to be careful. The usage scenario for this kind of relationship is that all
635 * of the physical devices in question use resources provided by the ACPI
636 * companion. A typical case is an MFD device where all the sub-devices share
637 * the parent's ACPI companion. In such cases we can only allow the primary
638 * (first) physical device to be matched with the help of the companion's PNP
639 * IDs.
640 *
641 * Additional physical devices sharing the ACPI companion can still use
642 * resources available from it but they will be matched normally using functions
643 * provided by their bus types (and analogously for their modalias).
644 */
645struct acpi_device *acpi_companion_match(const struct device *dev)
646{
647 struct acpi_device *adev;
648
649 adev = ACPI_COMPANION(dev);
650 if (!adev)
651 return NULL;
652
653 if (list_empty(&adev->pnp.ids))
654 return NULL;
655
656 return acpi_primary_dev_companion(adev, dev);
657}
658
659/**
660 * acpi_of_match_device - Match device object using the "compatible" property.
661 * @adev: ACPI device object to match.
662 * @of_match_table: List of device IDs to match against.
663 * @of_id: OF ID if matched
664 *
665 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
666 * identifiers and a _DSD object with the "compatible" property, use that
667 * property to match against the given list of identifiers.
668 */
669static bool acpi_of_match_device(struct acpi_device *adev,
670 const struct of_device_id *of_match_table,
671 const struct of_device_id **of_id)
672{
673 const union acpi_object *of_compatible, *obj;
674 int i, nval;
675
676 if (!adev)
677 return false;
678
679 of_compatible = adev->data.of_compatible;
680 if (!of_match_table || !of_compatible)
681 return false;
682
683 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
684 nval = of_compatible->package.count;
685 obj = of_compatible->package.elements;
686 } else { /* Must be ACPI_TYPE_STRING. */
687 nval = 1;
688 obj = of_compatible;
689 }
690 /* Now we can look for the driver DT compatible strings */
691 for (i = 0; i < nval; i++, obj++) {
692 const struct of_device_id *id;
693
694 for (id = of_match_table; id->compatible[0]; id++)
695 if (!strcasecmp(obj->string.pointer, id->compatible)) {
696 if (of_id)
697 *of_id = id;
698 return true;
699 }
700 }
701
702 return false;
703}
704
705static bool acpi_of_modalias(struct acpi_device *adev,
706 char *modalias, size_t len)
707{
708 const union acpi_object *of_compatible;
709 const union acpi_object *obj;
710 const char *str, *chr;
711
712 of_compatible = adev->data.of_compatible;
713 if (!of_compatible)
714 return false;
715
716 if (of_compatible->type == ACPI_TYPE_PACKAGE)
717 obj = of_compatible->package.elements;
718 else /* Must be ACPI_TYPE_STRING. */
719 obj = of_compatible;
720
721 str = obj->string.pointer;
722 chr = strchr(str, ',');
723 strlcpy(modalias, chr ? chr + 1 : str, len);
724
725 return true;
726}
727
728/**
729 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
730 * @adev: ACPI device object to match
731 * @default_id: ID string to use as default if no compatible string found
732 * @modalias: Pointer to buffer that modalias value will be copied into
733 * @len: Length of modalias buffer
734 *
735 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
736 * If there is a compatible string for @adev, it will be copied to @modalias
737 * with the vendor prefix stripped; otherwise, @default_id will be used.
738 */
739void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
740 char *modalias, size_t len)
741{
742 if (!acpi_of_modalias(adev, modalias, len))
743 strlcpy(modalias, default_id, len);
744}
745EXPORT_SYMBOL_GPL(acpi_set_modalias);
746
747static bool __acpi_match_device_cls(const struct acpi_device_id *id,
748 struct acpi_hardware_id *hwid)
749{
750 int i, msk, byte_shift;
751 char buf[3];
752
753 if (!id->cls)
754 return false;
755
756 /* Apply class-code bitmask, before checking each class-code byte */
757 for (i = 1; i <= 3; i++) {
758 byte_shift = 8 * (3 - i);
759 msk = (id->cls_msk >> byte_shift) & 0xFF;
760 if (!msk)
761 continue;
762
763 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
764 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
765 return false;
766 }
767 return true;
768}
769
770static bool __acpi_match_device(struct acpi_device *device,
771 const struct acpi_device_id *acpi_ids,
772 const struct of_device_id *of_ids,
773 const struct acpi_device_id **acpi_id,
774 const struct of_device_id **of_id)
775{
776 const struct acpi_device_id *id;
777 struct acpi_hardware_id *hwid;
778
779 /*
780 * If the device is not present, it is unnecessary to load device
781 * driver for it.
782 */
783 if (!device || !device->status.present)
784 return false;
785
786 list_for_each_entry(hwid, &device->pnp.ids, list) {
787 /* First, check the ACPI/PNP IDs provided by the caller. */
788 if (acpi_ids) {
789 for (id = acpi_ids; id->id[0] || id->cls; id++) {
790 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
791 goto out_acpi_match;
792 if (id->cls && __acpi_match_device_cls(id, hwid))
793 goto out_acpi_match;
794 }
795 }
796
797 /*
798 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
799 * "compatible" property if found.
800 */
801 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
802 return acpi_of_match_device(device, of_ids, of_id);
803 }
804 return false;
805
806out_acpi_match:
807 if (acpi_id)
808 *acpi_id = id;
809 return true;
810}
811
812/**
813 * acpi_match_device - Match a struct device against a given list of ACPI IDs
814 * @ids: Array of struct acpi_device_id object to match against.
815 * @dev: The device structure to match.
816 *
817 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
818 * object for that handle and use that object to match against a given list of
819 * device IDs.
820 *
821 * Return a pointer to the first matching ID on success or %NULL on failure.
822 */
823const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
824 const struct device *dev)
825{
826 const struct acpi_device_id *id = NULL;
827
828 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
829 return id;
830}
831EXPORT_SYMBOL_GPL(acpi_match_device);
832
833const void *acpi_device_get_match_data(const struct device *dev)
834{
835 const struct acpi_device_id *match;
836
837 match = acpi_match_device(dev->driver->acpi_match_table, dev);
838 if (!match)
839 return NULL;
840
841 return (const void *)match->driver_data;
842}
843EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
844
845int acpi_match_device_ids(struct acpi_device *device,
846 const struct acpi_device_id *ids)
847{
848 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
849}
850EXPORT_SYMBOL(acpi_match_device_ids);
851
852bool acpi_driver_match_device(struct device *dev,
853 const struct device_driver *drv)
854{
855 if (!drv->acpi_match_table)
856 return acpi_of_match_device(ACPI_COMPANION(dev),
857 drv->of_match_table,
858 NULL);
859
860 return __acpi_match_device(acpi_companion_match(dev),
861 drv->acpi_match_table, drv->of_match_table,
862 NULL, NULL);
863}
864EXPORT_SYMBOL_GPL(acpi_driver_match_device);
865
866/* --------------------------------------------------------------------------
867 ACPI Driver Management
868 -------------------------------------------------------------------------- */
869
870/**
871 * acpi_bus_register_driver - register a driver with the ACPI bus
872 * @driver: driver being registered
873 *
874 * Registers a driver with the ACPI bus. Searches the namespace for all
875 * devices that match the driver's criteria and binds. Returns zero for
876 * success or a negative error status for failure.
877 */
878int acpi_bus_register_driver(struct acpi_driver *driver)
879{
880 int ret;
881
882 if (acpi_disabled)
883 return -ENODEV;
884 driver->drv.name = driver->name;
885 driver->drv.bus = &acpi_bus_type;
886 driver->drv.owner = driver->owner;
887
888 ret = driver_register(&driver->drv);
889 return ret;
890}
891
892EXPORT_SYMBOL(acpi_bus_register_driver);
893
894/**
895 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
896 * @driver: driver to unregister
897 *
898 * Unregisters a driver with the ACPI bus. Searches the namespace for all
899 * devices that match the driver's criteria and unbinds.
900 */
901void acpi_bus_unregister_driver(struct acpi_driver *driver)
902{
903 driver_unregister(&driver->drv);
904}
905
906EXPORT_SYMBOL(acpi_bus_unregister_driver);
907
908/* --------------------------------------------------------------------------
909 ACPI Bus operations
910 -------------------------------------------------------------------------- */
911
912static int acpi_bus_match(struct device *dev, struct device_driver *drv)
913{
914 struct acpi_device *acpi_dev = to_acpi_device(dev);
915 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
916
917 return acpi_dev->flags.match_driver
918 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
919}
920
921static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
922{
923 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
924}
925
926static int acpi_device_probe(struct device *dev)
927{
928 struct acpi_device *acpi_dev = to_acpi_device(dev);
929 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
930 int ret;
931
932 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
933 return -EINVAL;
934
935 if (!acpi_drv->ops.add)
936 return -ENOSYS;
937
938 ret = acpi_drv->ops.add(acpi_dev);
939 if (ret)
940 return ret;
941
942 acpi_dev->driver = acpi_drv;
943 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
944 "Driver [%s] successfully bound to device [%s]\n",
945 acpi_drv->name, acpi_dev->pnp.bus_id));
946
947 if (acpi_drv->ops.notify) {
948 ret = acpi_device_install_notify_handler(acpi_dev);
949 if (ret) {
950 if (acpi_drv->ops.remove)
951 acpi_drv->ops.remove(acpi_dev);
952
953 acpi_dev->driver = NULL;
954 acpi_dev->driver_data = NULL;
955 return ret;
956 }
957 }
958
959 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
960 acpi_drv->name, acpi_dev->pnp.bus_id));
961 get_device(dev);
962 return 0;
963}
964
965static int acpi_device_remove(struct device * dev)
966{
967 struct acpi_device *acpi_dev = to_acpi_device(dev);
968 struct acpi_driver *acpi_drv = acpi_dev->driver;
969
970 if (acpi_drv) {
971 if (acpi_drv->ops.notify)
972 acpi_device_remove_notify_handler(acpi_dev);
973 if (acpi_drv->ops.remove)
974 acpi_drv->ops.remove(acpi_dev);
975 }
976 acpi_dev->driver = NULL;
977 acpi_dev->driver_data = NULL;
978
979 put_device(dev);
980 return 0;
981}
982
983struct bus_type acpi_bus_type = {
984 .name = "acpi",
985 .match = acpi_bus_match,
986 .probe = acpi_device_probe,
987 .remove = acpi_device_remove,
988 .uevent = acpi_device_uevent,
989};
990
991/* --------------------------------------------------------------------------
992 Initialization/Cleanup
993 -------------------------------------------------------------------------- */
994
995static int __init acpi_bus_init_irq(void)
996{
997 acpi_status status;
998 char *message = NULL;
999
1000
1001 /*
1002 * Let the system know what interrupt model we are using by
1003 * evaluating the \_PIC object, if exists.
1004 */
1005
1006 switch (acpi_irq_model) {
1007 case ACPI_IRQ_MODEL_PIC:
1008 message = "PIC";
1009 break;
1010 case ACPI_IRQ_MODEL_IOAPIC:
1011 message = "IOAPIC";
1012 break;
1013 case ACPI_IRQ_MODEL_IOSAPIC:
1014 message = "IOSAPIC";
1015 break;
1016 case ACPI_IRQ_MODEL_GIC:
1017 message = "GIC";
1018 break;
1019 case ACPI_IRQ_MODEL_PLATFORM:
1020 message = "platform specific model";
1021 break;
1022 default:
1023 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
1024 return -ENODEV;
1025 }
1026
1027 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1028
1029 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1030 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1031 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1032 return -ENODEV;
1033 }
1034
1035 return 0;
1036}
1037
1038/**
1039 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1040 *
1041 * The ACPI tables are accessible after this, but the handling of events has not
1042 * been initialized and the global lock is not available yet, so AML should not
1043 * be executed at this point.
1044 *
1045 * Doing this before switching the EFI runtime services to virtual mode allows
1046 * the EfiBootServices memory to be freed slightly earlier on boot.
1047 */
1048void __init acpi_early_init(void)
1049{
1050 acpi_status status;
1051
1052 if (acpi_disabled)
1053 return;
1054
1055 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1056
1057 /* enable workarounds, unless strict ACPI spec. compliance */
1058 if (!acpi_strict)
1059 acpi_gbl_enable_interpreter_slack = TRUE;
1060
1061 acpi_permanent_mmap = true;
1062
1063 /* Check machine-specific quirks */
1064 dmi_check_system(acpi_quirks_dmi_table);
1065
1066 status = acpi_reallocate_root_table();
1067 if (ACPI_FAILURE(status)) {
1068 printk(KERN_ERR PREFIX
1069 "Unable to reallocate ACPI tables\n");
1070 goto error0;
1071 }
1072
1073 status = acpi_initialize_subsystem();
1074 if (ACPI_FAILURE(status)) {
1075 printk(KERN_ERR PREFIX
1076 "Unable to initialize the ACPI Interpreter\n");
1077 goto error0;
1078 }
1079
1080 if (!acpi_gbl_execute_tables_as_methods &&
1081 acpi_gbl_group_module_level_code) {
1082 status = acpi_load_tables();
1083 if (ACPI_FAILURE(status)) {
1084 printk(KERN_ERR PREFIX
1085 "Unable to load the System Description Tables\n");
1086 goto error0;
1087 }
1088 }
1089
1090#ifdef CONFIG_X86
1091 if (!acpi_ioapic) {
1092 /* compatible (0) means level (3) */
1093 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1094 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1095 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1096 }
1097 /* Set PIC-mode SCI trigger type */
1098 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1099 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1100 } else {
1101 /*
1102 * now that acpi_gbl_FADT is initialized,
1103 * update it with result from INT_SRC_OVR parsing
1104 */
1105 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1106 }
1107#endif
1108 return;
1109
1110 error0:
1111 disable_acpi();
1112}
1113
1114/**
1115 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1116 *
1117 * Switch over the platform to the ACPI mode (if possible).
1118 *
1119 * Doing this too early is generally unsafe, but at the same time it needs to be
1120 * done before all things that really depend on ACPI. The right spot appears to
1121 * be before finalizing the EFI initialization.
1122 */
1123void __init acpi_subsystem_init(void)
1124{
1125 acpi_status status;
1126
1127 if (acpi_disabled)
1128 return;
1129
1130 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1131 if (ACPI_FAILURE(status)) {
1132 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1133 disable_acpi();
1134 } else {
1135 /*
1136 * If the system is using ACPI then we can be reasonably
1137 * confident that any regulators are managed by the firmware
1138 * so tell the regulator core it has everything it needs to
1139 * know.
1140 */
1141 regulator_has_full_constraints();
1142 }
1143}
1144
1145static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1146{
1147 acpi_scan_table_handler(event, table, context);
1148
1149 return acpi_sysfs_table_handler(event, table, context);
1150}
1151
1152static int __init acpi_bus_init(void)
1153{
1154 int result;
1155 acpi_status status;
1156
1157 acpi_os_initialize1();
1158
1159 /*
1160 * ACPI 2.0 requires the EC driver to be loaded and work before
1161 * the EC device is found in the namespace (i.e. before
1162 * acpi_load_tables() is called).
1163 *
1164 * This is accomplished by looking for the ECDT table, and getting
1165 * the EC parameters out of that.
1166 */
1167 status = acpi_ec_ecdt_probe();
1168 /* Ignore result. Not having an ECDT is not fatal. */
1169
1170 if (acpi_gbl_execute_tables_as_methods ||
1171 !acpi_gbl_group_module_level_code) {
1172 status = acpi_load_tables();
1173 if (ACPI_FAILURE(status)) {
1174 printk(KERN_ERR PREFIX
1175 "Unable to load the System Description Tables\n");
1176 goto error1;
1177 }
1178 }
1179
1180 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1181 if (ACPI_FAILURE(status)) {
1182 printk(KERN_ERR PREFIX
1183 "Unable to start the ACPI Interpreter\n");
1184 goto error1;
1185 }
1186
1187 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1188 if (ACPI_FAILURE(status)) {
1189 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1190 goto error1;
1191 }
1192
1193 /* Set capability bits for _OSC under processor scope */
1194 acpi_early_processor_osc();
1195
1196 /*
1197 * _OSC method may exist in module level code,
1198 * so it must be run after ACPI_FULL_INITIALIZATION
1199 */
1200 acpi_bus_osc_support();
1201
1202 /*
1203 * _PDC control method may load dynamic SSDT tables,
1204 * and we need to install the table handler before that.
1205 */
1206 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1207
1208 acpi_sysfs_init();
1209
1210 acpi_early_processor_set_pdc();
1211
1212 /*
1213 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1214 * is necessary to enable it as early as possible.
1215 */
1216 acpi_ec_dsdt_probe();
1217
1218 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1219
1220 /* Initialize sleep structures */
1221 acpi_sleep_init();
1222
1223 /*
1224 * Get the system interrupt model and evaluate \_PIC.
1225 */
1226 result = acpi_bus_init_irq();
1227 if (result)
1228 goto error1;
1229
1230 /*
1231 * Register the for all standard device notifications.
1232 */
1233 status =
1234 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1235 &acpi_bus_notify, NULL);
1236 if (ACPI_FAILURE(status)) {
1237 printk(KERN_ERR PREFIX
1238 "Unable to register for device notifications\n");
1239 goto error1;
1240 }
1241
1242 /*
1243 * Create the top ACPI proc directory
1244 */
1245 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1246
1247 result = bus_register(&acpi_bus_type);
1248 if (!result)
1249 return 0;
1250
1251 /* Mimic structured exception handling */
1252 error1:
1253 acpi_terminate();
1254 return -ENODEV;
1255}
1256
1257struct kobject *acpi_kobj;
1258EXPORT_SYMBOL_GPL(acpi_kobj);
1259
1260static int __init acpi_init(void)
1261{
1262 int result;
1263
1264 if (acpi_disabled) {
1265 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1266 return -ENODEV;
1267 }
1268
1269 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1270 if (!acpi_kobj) {
1271 printk(KERN_WARNING "%s: kset create error\n", __func__);
1272 acpi_kobj = NULL;
1273 }
1274
1275 init_acpi_device_notify();
1276 result = acpi_bus_init();
1277 if (result) {
1278 disable_acpi();
1279 return result;
1280 }
1281
1282 pci_mmcfg_late_init();
1283 acpi_iort_init();
1284 acpi_scan_init();
1285 acpi_ec_init();
1286 acpi_debugfs_init();
1287 acpi_sleep_proc_init();
1288 acpi_wakeup_device_init();
1289 acpi_debugger_init();
1290 acpi_setup_sb_notify_handler();
1291 return 0;
1292}
1293
1294subsys_initcall(acpi_init);