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