1/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <linux/acpi.h>
10#include <linux/acpi_iort.h>
11#include <linux/signal.h>
12#include <linux/kthread.h>
13#include <linux/dmi.h>
14#include <linux/nls.h>
15#include <linux/dma-mapping.h>
16#include <linux/platform_data/x86/apple.h>
17
18#include <asm/pgtable.h>
19
20#include "internal.h"
21
22#define _COMPONENT ACPI_BUS_COMPONENT
23ACPI_MODULE_NAME("scan");
24extern struct acpi_device *acpi_root;
25
26#define ACPI_BUS_CLASS "system_bus"
27#define ACPI_BUS_HID "LNXSYBUS"
28#define ACPI_BUS_DEVICE_NAME "System Bus"
29
30#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
31
32#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
33
34static const char *dummy_hid = "device";
35
36static LIST_HEAD(acpi_dep_list);
37static DEFINE_MUTEX(acpi_dep_list_lock);
38LIST_HEAD(acpi_bus_id_list);
39static DEFINE_MUTEX(acpi_scan_lock);
40static LIST_HEAD(acpi_scan_handlers_list);
41DEFINE_MUTEX(acpi_device_lock);
42LIST_HEAD(acpi_wakeup_device_list);
43static DEFINE_MUTEX(acpi_hp_context_lock);
44
45/*
46 * The UART device described by the SPCR table is the only object which needs
47 * special-casing. Everything else is covered by ACPI namespace paths in STAO
48 * table.
49 */
50static u64 spcr_uart_addr;
51
52struct acpi_dep_data {
53 struct list_head node;
54 acpi_handle master;
55 acpi_handle slave;
56};
57
58void acpi_scan_lock_acquire(void)
59{
60 mutex_lock(&acpi_scan_lock);
61}
62EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
63
64void acpi_scan_lock_release(void)
65{
66 mutex_unlock(&acpi_scan_lock);
67}
68EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
69
70void acpi_lock_hp_context(void)
71{
72 mutex_lock(&acpi_hp_context_lock);
73}
74
75void acpi_unlock_hp_context(void)
76{
77 mutex_unlock(&acpi_hp_context_lock);
78}
79
80void acpi_initialize_hp_context(struct acpi_device *adev,
81 struct acpi_hotplug_context *hp,
82 int (*notify)(struct acpi_device *, u32),
83 void (*uevent)(struct acpi_device *, u32))
84{
85 acpi_lock_hp_context();
86 hp->notify = notify;
87 hp->uevent = uevent;
88 acpi_set_hp_context(adev, hp);
89 acpi_unlock_hp_context();
90}
91EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
92
93int acpi_scan_add_handler(struct acpi_scan_handler *handler)
94{
95 if (!handler)
96 return -EINVAL;
97
98 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
99 return 0;
100}
101
102int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
103 const char *hotplug_profile_name)
104{
105 int error;
106
107 error = acpi_scan_add_handler(handler);
108 if (error)
109 return error;
110
111 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
112 return 0;
113}
114
115bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
116{
117 struct acpi_device_physical_node *pn;
118 bool offline = true;
119 char *envp[] = { "EVENT=offline", NULL };
120
121 /*
122 * acpi_container_offline() calls this for all of the container's
123 * children under the container's physical_node_lock lock.
124 */
125 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
126
127 list_for_each_entry(pn, &adev->physical_node_list, node)
128 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
129 if (uevent)
130 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
131
132 offline = false;
133 break;
134 }
135
136 mutex_unlock(&adev->physical_node_lock);
137 return offline;
138}
139
140static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
141 void **ret_p)
142{
143 struct acpi_device *device = NULL;
144 struct acpi_device_physical_node *pn;
145 bool second_pass = (bool)data;
146 acpi_status status = AE_OK;
147
148 if (acpi_bus_get_device(handle, &device))
149 return AE_OK;
150
151 if (device->handler && !device->handler->hotplug.enabled) {
152 *ret_p = &device->dev;
153 return AE_SUPPORT;
154 }
155
156 mutex_lock(&device->physical_node_lock);
157
158 list_for_each_entry(pn, &device->physical_node_list, node) {
159 int ret;
160
161 if (second_pass) {
162 /* Skip devices offlined by the first pass. */
163 if (pn->put_online)
164 continue;
165 } else {
166 pn->put_online = false;
167 }
168 ret = device_offline(pn->dev);
169 if (ret >= 0) {
170 pn->put_online = !ret;
171 } else {
172 *ret_p = pn->dev;
173 if (second_pass) {
174 status = AE_ERROR;
175 break;
176 }
177 }
178 }
179
180 mutex_unlock(&device->physical_node_lock);
181
182 return status;
183}
184
185static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
186 void **ret_p)
187{
188 struct acpi_device *device = NULL;
189 struct acpi_device_physical_node *pn;
190
191 if (acpi_bus_get_device(handle, &device))
192 return AE_OK;
193
194 mutex_lock(&device->physical_node_lock);
195
196 list_for_each_entry(pn, &device->physical_node_list, node)
197 if (pn->put_online) {
198 device_online(pn->dev);
199 pn->put_online = false;
200 }
201
202 mutex_unlock(&device->physical_node_lock);
203
204 return AE_OK;
205}
206
207static int acpi_scan_try_to_offline(struct acpi_device *device)
208{
209 acpi_handle handle = device->handle;
210 struct device *errdev = NULL;
211 acpi_status status;
212
213 /*
214 * Carry out two passes here and ignore errors in the first pass,
215 * because if the devices in question are memory blocks and
216 * CONFIG_MEMCG is set, one of the blocks may hold data structures
217 * that the other blocks depend on, but it is not known in advance which
218 * block holds them.
219 *
220 * If the first pass is successful, the second one isn't needed, though.
221 */
222 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 NULL, acpi_bus_offline, (void *)false,
224 (void **)&errdev);
225 if (status == AE_SUPPORT) {
226 dev_warn(errdev, "Offline disabled.\n");
227 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
228 acpi_bus_online, NULL, NULL, NULL);
229 return -EPERM;
230 }
231 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
232 if (errdev) {
233 errdev = NULL;
234 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
235 NULL, acpi_bus_offline, (void *)true,
236 (void **)&errdev);
237 if (!errdev)
238 acpi_bus_offline(handle, 0, (void *)true,
239 (void **)&errdev);
240
241 if (errdev) {
242 dev_warn(errdev, "Offline failed.\n");
243 acpi_bus_online(handle, 0, NULL, NULL);
244 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
245 ACPI_UINT32_MAX, acpi_bus_online,
246 NULL, NULL, NULL);
247 return -EBUSY;
248 }
249 }
250 return 0;
251}
252
253static int acpi_scan_hot_remove(struct acpi_device *device)
254{
255 acpi_handle handle = device->handle;
256 unsigned long long sta;
257 acpi_status status;
258
259 if (device->handler && device->handler->hotplug.demand_offline) {
260 if (!acpi_scan_is_offline(device, true))
261 return -EBUSY;
262 } else {
263 int error = acpi_scan_try_to_offline(device);
264 if (error)
265 return error;
266 }
267
268 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
269 "Hot-removing device %s...\n", dev_name(&device->dev)));
270
271 acpi_bus_trim(device);
272
273 acpi_evaluate_lck(handle, 0);
274 /*
275 * TBD: _EJD support.
276 */
277 status = acpi_evaluate_ej0(handle);
278 if (status == AE_NOT_FOUND)
279 return -ENODEV;
280 else if (ACPI_FAILURE(status))
281 return -EIO;
282
283 /*
284 * Verify if eject was indeed successful. If not, log an error
285 * message. No need to call _OST since _EJ0 call was made OK.
286 */
287 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
288 if (ACPI_FAILURE(status)) {
289 acpi_handle_warn(handle,
290 "Status check after eject failed (0x%x)\n", status);
291 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
292 acpi_handle_warn(handle,
293 "Eject incomplete - status 0x%llx\n", sta);
294 }
295
296 return 0;
297}
298
299static int acpi_scan_device_not_present(struct acpi_device *adev)
300{
301 if (!acpi_device_enumerated(adev)) {
302 dev_warn(&adev->dev, "Still not present\n");
303 return -EALREADY;
304 }
305 acpi_bus_trim(adev);
306 return 0;
307}
308
309static int acpi_scan_device_check(struct acpi_device *adev)
310{
311 int error;
312
313 acpi_bus_get_status(adev);
314 if (adev->status.present || adev->status.functional) {
315 /*
316 * This function is only called for device objects for which
317 * matching scan handlers exist. The only situation in which
318 * the scan handler is not attached to this device object yet
319 * is when the device has just appeared (either it wasn't
320 * present at all before or it was removed and then added
321 * again).
322 */
323 if (adev->handler) {
324 dev_warn(&adev->dev, "Already enumerated\n");
325 return -EALREADY;
326 }
327 error = acpi_bus_scan(adev->handle);
328 if (error) {
329 dev_warn(&adev->dev, "Namespace scan failure\n");
330 return error;
331 }
332 if (!adev->handler) {
333 dev_warn(&adev->dev, "Enumeration failure\n");
334 error = -ENODEV;
335 }
336 } else {
337 error = acpi_scan_device_not_present(adev);
338 }
339 return error;
340}
341
342static int acpi_scan_bus_check(struct acpi_device *adev)
343{
344 struct acpi_scan_handler *handler = adev->handler;
345 struct acpi_device *child;
346 int error;
347
348 acpi_bus_get_status(adev);
349 if (!(adev->status.present || adev->status.functional)) {
350 acpi_scan_device_not_present(adev);
351 return 0;
352 }
353 if (handler && handler->hotplug.scan_dependent)
354 return handler->hotplug.scan_dependent(adev);
355
356 error = acpi_bus_scan(adev->handle);
357 if (error) {
358 dev_warn(&adev->dev, "Namespace scan failure\n");
359 return error;
360 }
361 list_for_each_entry(child, &adev->children, node) {
362 error = acpi_scan_bus_check(child);
363 if (error)
364 return error;
365 }
366 return 0;
367}
368
369static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
370{
371 switch (type) {
372 case ACPI_NOTIFY_BUS_CHECK:
373 return acpi_scan_bus_check(adev);
374 case ACPI_NOTIFY_DEVICE_CHECK:
375 return acpi_scan_device_check(adev);
376 case ACPI_NOTIFY_EJECT_REQUEST:
377 case ACPI_OST_EC_OSPM_EJECT:
378 if (adev->handler && !adev->handler->hotplug.enabled) {
379 dev_info(&adev->dev, "Eject disabled\n");
380 return -EPERM;
381 }
382 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
383 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
384 return acpi_scan_hot_remove(adev);
385 }
386 return -EINVAL;
387}
388
389void acpi_device_hotplug(struct acpi_device *adev, u32 src)
390{
391 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
392 int error = -ENODEV;
393
394 lock_device_hotplug();
395 mutex_lock(&acpi_scan_lock);
396
397 /*
398 * The device object's ACPI handle cannot become invalid as long as we
399 * are holding acpi_scan_lock, but it might have become invalid before
400 * that lock was acquired.
401 */
402 if (adev->handle == INVALID_ACPI_HANDLE)
403 goto err_out;
404
405 if (adev->flags.is_dock_station) {
406 error = dock_notify(adev, src);
407 } else if (adev->flags.hotplug_notify) {
408 error = acpi_generic_hotplug_event(adev, src);
409 } else {
410 int (*notify)(struct acpi_device *, u32);
411
412 acpi_lock_hp_context();
413 notify = adev->hp ? adev->hp->notify : NULL;
414 acpi_unlock_hp_context();
415 /*
416 * There may be additional notify handlers for device objects
417 * without the .event() callback, so ignore them here.
418 */
419 if (notify)
420 error = notify(adev, src);
421 else
422 goto out;
423 }
424 switch (error) {
425 case 0:
426 ost_code = ACPI_OST_SC_SUCCESS;
427 break;
428 case -EPERM:
429 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
430 break;
431 case -EBUSY:
432 ost_code = ACPI_OST_SC_DEVICE_BUSY;
433 break;
434 default:
435 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
436 break;
437 }
438
439 err_out:
440 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
441
442 out:
443 acpi_bus_put_acpi_device(adev);
444 mutex_unlock(&acpi_scan_lock);
445 unlock_device_hotplug();
446}
447
448static void acpi_free_power_resources_lists(struct acpi_device *device)
449{
450 int i;
451
452 if (device->wakeup.flags.valid)
453 acpi_power_resources_list_free(&device->wakeup.resources);
454
455 if (!device->power.flags.power_resources)
456 return;
457
458 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
459 struct acpi_device_power_state *ps = &device->power.states[i];
460 acpi_power_resources_list_free(&ps->resources);
461 }
462}
463
464static void acpi_device_release(struct device *dev)
465{
466 struct acpi_device *acpi_dev = to_acpi_device(dev);
467
468 acpi_free_properties(acpi_dev);
469 acpi_free_pnp_ids(&acpi_dev->pnp);
470 acpi_free_power_resources_lists(acpi_dev);
471 kfree(acpi_dev);
472}
473
474static void acpi_device_del(struct acpi_device *device)
475{
476 struct acpi_device_bus_id *acpi_device_bus_id;
477
478 mutex_lock(&acpi_device_lock);
479 if (device->parent)
480 list_del(&device->node);
481
482 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
483 if (!strcmp(acpi_device_bus_id->bus_id,
484 acpi_device_hid(device))) {
485 if (acpi_device_bus_id->instance_no > 0)
486 acpi_device_bus_id->instance_no--;
487 else {
488 list_del(&acpi_device_bus_id->node);
489 kfree(acpi_device_bus_id);
490 }
491 break;
492 }
493
494 list_del(&device->wakeup_list);
495 mutex_unlock(&acpi_device_lock);
496
497 acpi_power_add_remove_device(device, false);
498 acpi_device_remove_files(device);
499 if (device->remove)
500 device->remove(device);
501
502 device_del(&device->dev);
503}
504
505static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
506
507static LIST_HEAD(acpi_device_del_list);
508static DEFINE_MUTEX(acpi_device_del_lock);
509
510static void acpi_device_del_work_fn(struct work_struct *work_not_used)
511{
512 for (;;) {
513 struct acpi_device *adev;
514
515 mutex_lock(&acpi_device_del_lock);
516
517 if (list_empty(&acpi_device_del_list)) {
518 mutex_unlock(&acpi_device_del_lock);
519 break;
520 }
521 adev = list_first_entry(&acpi_device_del_list,
522 struct acpi_device, del_list);
523 list_del(&adev->del_list);
524
525 mutex_unlock(&acpi_device_del_lock);
526
527 blocking_notifier_call_chain(&acpi_reconfig_chain,
528 ACPI_RECONFIG_DEVICE_REMOVE, adev);
529
530 acpi_device_del(adev);
531 /*
532 * Drop references to all power resources that might have been
533 * used by the device.
534 */
535 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
536 put_device(&adev->dev);
537 }
538}
539
540/**
541 * acpi_scan_drop_device - Drop an ACPI device object.
542 * @handle: Handle of an ACPI namespace node, not used.
543 * @context: Address of the ACPI device object to drop.
544 *
545 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
546 * namespace node the device object pointed to by @context is attached to.
547 *
548 * The unregistration is carried out asynchronously to avoid running
549 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
550 * ensure the correct ordering (the device objects must be unregistered in the
551 * same order in which the corresponding namespace nodes are deleted).
552 */
553static void acpi_scan_drop_device(acpi_handle handle, void *context)
554{
555 static DECLARE_WORK(work, acpi_device_del_work_fn);
556 struct acpi_device *adev = context;
557
558 mutex_lock(&acpi_device_del_lock);
559
560 /*
561 * Use the ACPI hotplug workqueue which is ordered, so this work item
562 * won't run after any hotplug work items submitted subsequently. That
563 * prevents attempts to register device objects identical to those being
564 * deleted from happening concurrently (such attempts result from
565 * hotplug events handled via the ACPI hotplug workqueue). It also will
566 * run after all of the work items submitted previosuly, which helps
567 * those work items to ensure that they are not accessing stale device
568 * objects.
569 */
570 if (list_empty(&acpi_device_del_list))
571 acpi_queue_hotplug_work(&work);
572
573 list_add_tail(&adev->del_list, &acpi_device_del_list);
574 /* Make acpi_ns_validate_handle() return NULL for this handle. */
575 adev->handle = INVALID_ACPI_HANDLE;
576
577 mutex_unlock(&acpi_device_del_lock);
578}
579
580static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
581 void (*callback)(void *))
582{
583 acpi_status status;
584
585 if (!device)
586 return -EINVAL;
587
588 status = acpi_get_data_full(handle, acpi_scan_drop_device,
589 (void **)device, callback);
590 if (ACPI_FAILURE(status) || !*device) {
591 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
592 handle));
593 return -ENODEV;
594 }
595 return 0;
596}
597
598int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
599{
600 return acpi_get_device_data(handle, device, NULL);
601}
602EXPORT_SYMBOL(acpi_bus_get_device);
603
604static void get_acpi_device(void *dev)
605{
606 if (dev)
607 get_device(&((struct acpi_device *)dev)->dev);
608}
609
610struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
611{
612 struct acpi_device *adev = NULL;
613
614 acpi_get_device_data(handle, &adev, get_acpi_device);
615 return adev;
616}
617
618void acpi_bus_put_acpi_device(struct acpi_device *adev)
619{
620 put_device(&adev->dev);
621}
622
623int acpi_device_add(struct acpi_device *device,
624 void (*release)(struct device *))
625{
626 int result;
627 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
628 int found = 0;
629
630 if (device->handle) {
631 acpi_status status;
632
633 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
634 device);
635 if (ACPI_FAILURE(status)) {
636 acpi_handle_err(device->handle,
637 "Unable to attach device data\n");
638 return -ENODEV;
639 }
640 }
641
642 /*
643 * Linkage
644 * -------
645 * Link this device to its parent and siblings.
646 */
647 INIT_LIST_HEAD(&device->children);
648 INIT_LIST_HEAD(&device->node);
649 INIT_LIST_HEAD(&device->wakeup_list);
650 INIT_LIST_HEAD(&device->physical_node_list);
651 INIT_LIST_HEAD(&device->del_list);
652 mutex_init(&device->physical_node_lock);
653
654 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
655 if (!new_bus_id) {
656 pr_err(PREFIX "Memory allocation error\n");
657 result = -ENOMEM;
658 goto err_detach;
659 }
660
661 mutex_lock(&acpi_device_lock);
662 /*
663 * Find suitable bus_id and instance number in acpi_bus_id_list
664 * If failed, create one and link it into acpi_bus_id_list
665 */
666 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
667 if (!strcmp(acpi_device_bus_id->bus_id,
668 acpi_device_hid(device))) {
669 acpi_device_bus_id->instance_no++;
670 found = 1;
671 kfree(new_bus_id);
672 break;
673 }
674 }
675 if (!found) {
676 acpi_device_bus_id = new_bus_id;
677 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
678 acpi_device_bus_id->instance_no = 0;
679 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
680 }
681 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
682
683 if (device->parent)
684 list_add_tail(&device->node, &device->parent->children);
685
686 if (device->wakeup.flags.valid)
687 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
688 mutex_unlock(&acpi_device_lock);
689
690 if (device->parent)
691 device->dev.parent = &device->parent->dev;
692 device->dev.bus = &acpi_bus_type;
693 device->dev.release = release;
694 result = device_add(&device->dev);
695 if (result) {
696 dev_err(&device->dev, "Error registering device\n");
697 goto err;
698 }
699
700 result = acpi_device_setup_files(device);
701 if (result)
702 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
703 dev_name(&device->dev));
704
705 return 0;
706
707 err:
708 mutex_lock(&acpi_device_lock);
709 if (device->parent)
710 list_del(&device->node);
711 list_del(&device->wakeup_list);
712 mutex_unlock(&acpi_device_lock);
713
714 err_detach:
715 acpi_detach_data(device->handle, acpi_scan_drop_device);
716 return result;
717}
718
719/* --------------------------------------------------------------------------
720 Device Enumeration
721 -------------------------------------------------------------------------- */
722static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
723{
724 struct acpi_device *device = NULL;
725 acpi_status status;
726
727 /*
728 * Fixed hardware devices do not appear in the namespace and do not
729 * have handles, but we fabricate acpi_devices for them, so we have
730 * to deal with them specially.
731 */
732 if (!handle)
733 return acpi_root;
734
735 do {
736 status = acpi_get_parent(handle, &handle);
737 if (ACPI_FAILURE(status))
738 return status == AE_NULL_ENTRY ? NULL : acpi_root;
739 } while (acpi_bus_get_device(handle, &device));
740 return device;
741}
742
743acpi_status
744acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
745{
746 acpi_status status;
747 acpi_handle tmp;
748 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
749 union acpi_object *obj;
750
751 status = acpi_get_handle(handle, "_EJD", &tmp);
752 if (ACPI_FAILURE(status))
753 return status;
754
755 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
756 if (ACPI_SUCCESS(status)) {
757 obj = buffer.pointer;
758 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
759 ejd);
760 kfree(buffer.pointer);
761 }
762 return status;
763}
764EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
765
766static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
767 struct acpi_device_wakeup *wakeup)
768{
769 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
770 union acpi_object *package = NULL;
771 union acpi_object *element = NULL;
772 acpi_status status;
773 int err = -ENODATA;
774
775 if (!wakeup)
776 return -EINVAL;
777
778 INIT_LIST_HEAD(&wakeup->resources);
779
780 /* _PRW */
781 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
782 if (ACPI_FAILURE(status)) {
783 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
784 return err;
785 }
786
787 package = (union acpi_object *)buffer.pointer;
788
789 if (!package || package->package.count < 2)
790 goto out;
791
792 element = &(package->package.elements[0]);
793 if (!element)
794 goto out;
795
796 if (element->type == ACPI_TYPE_PACKAGE) {
797 if ((element->package.count < 2) ||
798 (element->package.elements[0].type !=
799 ACPI_TYPE_LOCAL_REFERENCE)
800 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
801 goto out;
802
803 wakeup->gpe_device =
804 element->package.elements[0].reference.handle;
805 wakeup->gpe_number =
806 (u32) element->package.elements[1].integer.value;
807 } else if (element->type == ACPI_TYPE_INTEGER) {
808 wakeup->gpe_device = NULL;
809 wakeup->gpe_number = element->integer.value;
810 } else {
811 goto out;
812 }
813
814 element = &(package->package.elements[1]);
815 if (element->type != ACPI_TYPE_INTEGER)
816 goto out;
817
818 wakeup->sleep_state = element->integer.value;
819
820 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
821 if (err)
822 goto out;
823
824 if (!list_empty(&wakeup->resources)) {
825 int sleep_state;
826
827 err = acpi_power_wakeup_list_init(&wakeup->resources,
828 &sleep_state);
829 if (err) {
830 acpi_handle_warn(handle, "Retrieving current states "
831 "of wakeup power resources failed\n");
832 acpi_power_resources_list_free(&wakeup->resources);
833 goto out;
834 }
835 if (sleep_state < wakeup->sleep_state) {
836 acpi_handle_warn(handle, "Overriding _PRW sleep state "
837 "(S%d) by S%d from power resources\n",
838 (int)wakeup->sleep_state, sleep_state);
839 wakeup->sleep_state = sleep_state;
840 }
841 }
842
843 out:
844 kfree(buffer.pointer);
845 return err;
846}
847
848static bool acpi_wakeup_gpe_init(struct acpi_device *device)
849{
850 static const struct acpi_device_id button_device_ids[] = {
851 {"PNP0C0C", 0},
852 {"PNP0C0D", 0},
853 {"PNP0C0E", 0},
854 {"", 0},
855 };
856 struct acpi_device_wakeup *wakeup = &device->wakeup;
857 acpi_status status;
858
859 wakeup->flags.notifier_present = 0;
860
861 /* Power button, Lid switch always enable wakeup */
862 if (!acpi_match_device_ids(device, button_device_ids)) {
863 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
864 /* Do not use Lid/sleep button for S5 wakeup */
865 if (wakeup->sleep_state == ACPI_STATE_S5)
866 wakeup->sleep_state = ACPI_STATE_S4;
867 }
868 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
869 device_set_wakeup_capable(&device->dev, true);
870 return true;
871 }
872
873 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
874 wakeup->gpe_number);
875 return ACPI_SUCCESS(status);
876}
877
878static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
879{
880 int err;
881
882 /* Presence of _PRW indicates wake capable */
883 if (!acpi_has_method(device->handle, "_PRW"))
884 return;
885
886 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
887 &device->wakeup);
888 if (err) {
889 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
890 return;
891 }
892
893 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
894 device->wakeup.prepare_count = 0;
895 /*
896 * Call _PSW/_DSW object to disable its ability to wake the sleeping
897 * system for the ACPI device with the _PRW object.
898 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
899 * So it is necessary to call _DSW object first. Only when it is not
900 * present will the _PSW object used.
901 */
902 err = acpi_device_sleep_wake(device, 0, 0, 0);
903 if (err)
904 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
905 "error in _DSW or _PSW evaluation\n"));
906}
907
908static void acpi_bus_init_power_state(struct acpi_device *device, int state)
909{
910 struct acpi_device_power_state *ps = &device->power.states[state];
911 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
912 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
913 acpi_status status;
914
915 INIT_LIST_HEAD(&ps->resources);
916
917 /* Evaluate "_PRx" to get referenced power resources */
918 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
919 if (ACPI_SUCCESS(status)) {
920 union acpi_object *package = buffer.pointer;
921
922 if (buffer.length && package
923 && package->type == ACPI_TYPE_PACKAGE
924 && package->package.count) {
925 int err = acpi_extract_power_resources(package, 0,
926 &ps->resources);
927 if (!err)
928 device->power.flags.power_resources = 1;
929 }
930 ACPI_FREE(buffer.pointer);
931 }
932
933 /* Evaluate "_PSx" to see if we can do explicit sets */
934 pathname[2] = 'S';
935 if (acpi_has_method(device->handle, pathname))
936 ps->flags.explicit_set = 1;
937
938 /* State is valid if there are means to put the device into it. */
939 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
940 ps->flags.valid = 1;
941
942 ps->power = -1; /* Unknown - driver assigned */
943 ps->latency = -1; /* Unknown - driver assigned */
944}
945
946static void acpi_bus_get_power_flags(struct acpi_device *device)
947{
948 u32 i;
949
950 /* Presence of _PS0|_PR0 indicates 'power manageable' */
951 if (!acpi_has_method(device->handle, "_PS0") &&
952 !acpi_has_method(device->handle, "_PR0"))
953 return;
954
955 device->flags.power_manageable = 1;
956
957 /*
958 * Power Management Flags
959 */
960 if (acpi_has_method(device->handle, "_PSC"))
961 device->power.flags.explicit_get = 1;
962
963 if (acpi_has_method(device->handle, "_IRC"))
964 device->power.flags.inrush_current = 1;
965
966 if (acpi_has_method(device->handle, "_DSW"))
967 device->power.flags.dsw_present = 1;
968
969 /*
970 * Enumerate supported power management states
971 */
972 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
973 acpi_bus_init_power_state(device, i);
974
975 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
976 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
977 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
978
979 /* Set defaults for D0 and D3hot states (always valid) */
980 device->power.states[ACPI_STATE_D0].flags.valid = 1;
981 device->power.states[ACPI_STATE_D0].power = 100;
982 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
983
984 if (acpi_bus_init_power(device))
985 device->flags.power_manageable = 0;
986}
987
988static void acpi_bus_get_flags(struct acpi_device *device)
989{
990 /* Presence of _STA indicates 'dynamic_status' */
991 if (acpi_has_method(device->handle, "_STA"))
992 device->flags.dynamic_status = 1;
993
994 /* Presence of _RMV indicates 'removable' */
995 if (acpi_has_method(device->handle, "_RMV"))
996 device->flags.removable = 1;
997
998 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
999 if (acpi_has_method(device->handle, "_EJD") ||
1000 acpi_has_method(device->handle, "_EJ0"))
1001 device->flags.ejectable = 1;
1002}
1003
1004static void acpi_device_get_busid(struct acpi_device *device)
1005{
1006 char bus_id[5] = { '?', 0 };
1007 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1008 int i = 0;
1009
1010 /*
1011 * Bus ID
1012 * ------
1013 * The device's Bus ID is simply the object name.
1014 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1015 */
1016 if (ACPI_IS_ROOT_DEVICE(device)) {
1017 strcpy(device->pnp.bus_id, "ACPI");
1018 return;
1019 }
1020
1021 switch (device->device_type) {
1022 case ACPI_BUS_TYPE_POWER_BUTTON:
1023 strcpy(device->pnp.bus_id, "PWRF");
1024 break;
1025 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1026 strcpy(device->pnp.bus_id, "SLPF");
1027 break;
1028 case ACPI_BUS_TYPE_ECDT_EC:
1029 strcpy(device->pnp.bus_id, "ECDT");
1030 break;
1031 default:
1032 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1033 /* Clean up trailing underscores (if any) */
1034 for (i = 3; i > 1; i--) {
1035 if (bus_id[i] == '_')
1036 bus_id[i] = '\0';
1037 else
1038 break;
1039 }
1040 strcpy(device->pnp.bus_id, bus_id);
1041 break;
1042 }
1043}
1044
1045/*
1046 * acpi_ata_match - see if an acpi object is an ATA device
1047 *
1048 * If an acpi object has one of the ACPI ATA methods defined,
1049 * then we can safely call it an ATA device.
1050 */
1051bool acpi_ata_match(acpi_handle handle)
1052{
1053 return acpi_has_method(handle, "_GTF") ||
1054 acpi_has_method(handle, "_GTM") ||
1055 acpi_has_method(handle, "_STM") ||
1056 acpi_has_method(handle, "_SDD");
1057}
1058
1059/*
1060 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1061 *
1062 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1063 * then we can safely call it an ejectable drive bay
1064 */
1065bool acpi_bay_match(acpi_handle handle)
1066{
1067 acpi_handle phandle;
1068
1069 if (!acpi_has_method(handle, "_EJ0"))
1070 return false;
1071 if (acpi_ata_match(handle))
1072 return true;
1073 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1074 return false;
1075
1076 return acpi_ata_match(phandle);
1077}
1078
1079bool acpi_device_is_battery(struct acpi_device *adev)
1080{
1081 struct acpi_hardware_id *hwid;
1082
1083 list_for_each_entry(hwid, &adev->pnp.ids, list)
1084 if (!strcmp("PNP0C0A", hwid->id))
1085 return true;
1086
1087 return false;
1088}
1089
1090static bool is_ejectable_bay(struct acpi_device *adev)
1091{
1092 acpi_handle handle = adev->handle;
1093
1094 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1095 return true;
1096
1097 return acpi_bay_match(handle);
1098}
1099
1100/*
1101 * acpi_dock_match - see if an acpi object has a _DCK method
1102 */
1103bool acpi_dock_match(acpi_handle handle)
1104{
1105 return acpi_has_method(handle, "_DCK");
1106}
1107
1108static acpi_status
1109acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1110 void **return_value)
1111{
1112 long *cap = context;
1113
1114 if (acpi_has_method(handle, "_BCM") &&
1115 acpi_has_method(handle, "_BCL")) {
1116 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1117 "support\n"));
1118 *cap |= ACPI_VIDEO_BACKLIGHT;
1119 /* We have backlight support, no need to scan further */
1120 return AE_CTRL_TERMINATE;
1121 }
1122 return 0;
1123}
1124
1125/* Returns true if the ACPI object is a video device which can be
1126 * handled by video.ko.
1127 * The device will get a Linux specific CID added in scan.c to
1128 * identify the device as an ACPI graphics device
1129 * Be aware that the graphics device may not be physically present
1130 * Use acpi_video_get_capabilities() to detect general ACPI video
1131 * capabilities of present cards
1132 */
1133long acpi_is_video_device(acpi_handle handle)
1134{
1135 long video_caps = 0;
1136
1137 /* Is this device able to support video switching ? */
1138 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1139 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1140
1141 /* Is this device able to retrieve a video ROM ? */
1142 if (acpi_has_method(handle, "_ROM"))
1143 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1144
1145 /* Is this device able to configure which video head to be POSTed ? */
1146 if (acpi_has_method(handle, "_VPO") &&
1147 acpi_has_method(handle, "_GPD") &&
1148 acpi_has_method(handle, "_SPD"))
1149 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1150
1151 /* Only check for backlight functionality if one of the above hit. */
1152 if (video_caps)
1153 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1154 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1155 &video_caps, NULL);
1156
1157 return video_caps;
1158}
1159EXPORT_SYMBOL(acpi_is_video_device);
1160
1161const char *acpi_device_hid(struct acpi_device *device)
1162{
1163 struct acpi_hardware_id *hid;
1164
1165 if (list_empty(&device->pnp.ids))
1166 return dummy_hid;
1167
1168 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1169 return hid->id;
1170}
1171EXPORT_SYMBOL(acpi_device_hid);
1172
1173static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1174{
1175 struct acpi_hardware_id *id;
1176
1177 id = kmalloc(sizeof(*id), GFP_KERNEL);
1178 if (!id)
1179 return;
1180
1181 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1182 if (!id->id) {
1183 kfree(id);
1184 return;
1185 }
1186
1187 list_add_tail(&id->list, &pnp->ids);
1188 pnp->type.hardware_id = 1;
1189}
1190
1191/*
1192 * Old IBM workstations have a DSDT bug wherein the SMBus object
1193 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1194 * prefix. Work around this.
1195 */
1196static bool acpi_ibm_smbus_match(acpi_handle handle)
1197{
1198 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1199 struct acpi_buffer path = { sizeof(node_name), node_name };
1200
1201 if (!dmi_name_in_vendors("IBM"))
1202 return false;
1203
1204 /* Look for SMBS object */
1205 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1206 strcmp("SMBS", path.pointer))
1207 return false;
1208
1209 /* Does it have the necessary (but misnamed) methods? */
1210 if (acpi_has_method(handle, "SBI") &&
1211 acpi_has_method(handle, "SBR") &&
1212 acpi_has_method(handle, "SBW"))
1213 return true;
1214
1215 return false;
1216}
1217
1218static bool acpi_object_is_system_bus(acpi_handle handle)
1219{
1220 acpi_handle tmp;
1221
1222 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1223 tmp == handle)
1224 return true;
1225 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1226 tmp == handle)
1227 return true;
1228
1229 return false;
1230}
1231
1232static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1233 int device_type)
1234{
1235 acpi_status status;
1236 struct acpi_device_info *info;
1237 struct acpi_pnp_device_id_list *cid_list;
1238 int i;
1239
1240 switch (device_type) {
1241 case ACPI_BUS_TYPE_DEVICE:
1242 if (handle == ACPI_ROOT_OBJECT) {
1243 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1244 break;
1245 }
1246
1247 status = acpi_get_object_info(handle, &info);
1248 if (ACPI_FAILURE(status)) {
1249 pr_err(PREFIX "%s: Error reading device info\n",
1250 __func__);
1251 return;
1252 }
1253
1254 if (info->valid & ACPI_VALID_HID) {
1255 acpi_add_id(pnp, info->hardware_id.string);
1256 pnp->type.platform_id = 1;
1257 }
1258 if (info->valid & ACPI_VALID_CID) {
1259 cid_list = &info->compatible_id_list;
1260 for (i = 0; i < cid_list->count; i++)
1261 acpi_add_id(pnp, cid_list->ids[i].string);
1262 }
1263 if (info->valid & ACPI_VALID_ADR) {
1264 pnp->bus_address = info->address;
1265 pnp->type.bus_address = 1;
1266 }
1267 if (info->valid & ACPI_VALID_UID)
1268 pnp->unique_id = kstrdup(info->unique_id.string,
1269 GFP_KERNEL);
1270 if (info->valid & ACPI_VALID_CLS)
1271 acpi_add_id(pnp, info->class_code.string);
1272
1273 kfree(info);
1274
1275 /*
1276 * Some devices don't reliably have _HIDs & _CIDs, so add
1277 * synthetic HIDs to make sure drivers can find them.
1278 */
1279 if (acpi_is_video_device(handle))
1280 acpi_add_id(pnp, ACPI_VIDEO_HID);
1281 else if (acpi_bay_match(handle))
1282 acpi_add_id(pnp, ACPI_BAY_HID);
1283 else if (acpi_dock_match(handle))
1284 acpi_add_id(pnp, ACPI_DOCK_HID);
1285 else if (acpi_ibm_smbus_match(handle))
1286 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1287 else if (list_empty(&pnp->ids) &&
1288 acpi_object_is_system_bus(handle)) {
1289 /* \_SB, \_TZ, LNXSYBUS */
1290 acpi_add_id(pnp, ACPI_BUS_HID);
1291 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1292 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1293 }
1294
1295 break;
1296 case ACPI_BUS_TYPE_POWER:
1297 acpi_add_id(pnp, ACPI_POWER_HID);
1298 break;
1299 case ACPI_BUS_TYPE_PROCESSOR:
1300 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1301 break;
1302 case ACPI_BUS_TYPE_THERMAL:
1303 acpi_add_id(pnp, ACPI_THERMAL_HID);
1304 break;
1305 case ACPI_BUS_TYPE_POWER_BUTTON:
1306 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1307 break;
1308 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1309 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1310 break;
1311 case ACPI_BUS_TYPE_ECDT_EC:
1312 acpi_add_id(pnp, ACPI_ECDT_HID);
1313 break;
1314 }
1315}
1316
1317void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1318{
1319 struct acpi_hardware_id *id, *tmp;
1320
1321 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1322 kfree_const(id->id);
1323 kfree(id);
1324 }
1325 kfree(pnp->unique_id);
1326}
1327
1328/**
1329 * acpi_dma_supported - Check DMA support for the specified device.
1330 * @adev: The pointer to acpi device
1331 *
1332 * Return false if DMA is not supported. Otherwise, return true
1333 */
1334bool acpi_dma_supported(struct acpi_device *adev)
1335{
1336 if (!adev)
1337 return false;
1338
1339 if (adev->flags.cca_seen)
1340 return true;
1341
1342 /*
1343 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1344 * DMA on "Intel platforms". Presumably that includes all x86 and
1345 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1346 */
1347 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1348 return true;
1349
1350 return false;
1351}
1352
1353/**
1354 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1355 * @adev: The pointer to acpi device
1356 *
1357 * Return enum dev_dma_attr.
1358 */
1359enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1360{
1361 if (!acpi_dma_supported(adev))
1362 return DEV_DMA_NOT_SUPPORTED;
1363
1364 if (adev->flags.coherent_dma)
1365 return DEV_DMA_COHERENT;
1366 else
1367 return DEV_DMA_NON_COHERENT;
1368}
1369
1370/**
1371 * acpi_dma_get_range() - Get device DMA parameters.
1372 *
1373 * @dev: device to configure
1374 * @dma_addr: pointer device DMA address result
1375 * @offset: pointer to the DMA offset result
1376 * @size: pointer to DMA range size result
1377 *
1378 * Evaluate DMA regions and return respectively DMA region start, offset
1379 * and size in dma_addr, offset and size on parsing success; it does not
1380 * update the passed in values on failure.
1381 *
1382 * Return 0 on success, < 0 on failure.
1383 */
1384int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1385 u64 *size)
1386{
1387 struct acpi_device *adev;
1388 LIST_HEAD(list);
1389 struct resource_entry *rentry;
1390 int ret;
1391 struct device *dma_dev = dev;
1392 u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1393
1394 /*
1395 * Walk the device tree chasing an ACPI companion with a _DMA
1396 * object while we go. Stop if we find a device with an ACPI
1397 * companion containing a _DMA method.
1398 */
1399 do {
1400 adev = ACPI_COMPANION(dma_dev);
1401 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1402 break;
1403
1404 dma_dev = dma_dev->parent;
1405 } while (dma_dev);
1406
1407 if (!dma_dev)
1408 return -ENODEV;
1409
1410 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1411 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1412 return -EINVAL;
1413 }
1414
1415 ret = acpi_dev_get_dma_resources(adev, &list);
1416 if (ret > 0) {
1417 list_for_each_entry(rentry, &list, node) {
1418 if (dma_offset && rentry->offset != dma_offset) {
1419 ret = -EINVAL;
1420 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1421 goto out;
1422 }
1423 dma_offset = rentry->offset;
1424
1425 /* Take lower and upper limits */
1426 if (rentry->res->start < dma_start)
1427 dma_start = rentry->res->start;
1428 if (rentry->res->end > dma_end)
1429 dma_end = rentry->res->end;
1430 }
1431
1432 if (dma_start >= dma_end) {
1433 ret = -EINVAL;
1434 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1435 goto out;
1436 }
1437
1438 *dma_addr = dma_start - dma_offset;
1439 len = dma_end - dma_start;
1440 *size = max(len, len + 1);
1441 *offset = dma_offset;
1442 }
1443 out:
1444 acpi_dev_free_resource_list(&list);
1445
1446 return ret >= 0 ? 0 : ret;
1447}
1448
1449/**
1450 * acpi_dma_configure - Set-up DMA configuration for the device.
1451 * @dev: The pointer to the device
1452 * @attr: device dma attributes
1453 */
1454int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1455{
1456 const struct iommu_ops *iommu;
1457 u64 dma_addr = 0, size = 0;
1458
1459 if (attr == DEV_DMA_NOT_SUPPORTED) {
1460 set_dma_ops(dev, &dma_dummy_ops);
1461 return 0;
1462 }
1463
1464 iort_dma_setup(dev, &dma_addr, &size);
1465
1466 iommu = iort_iommu_configure(dev);
1467 if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1468 return -EPROBE_DEFER;
1469
1470 arch_setup_dma_ops(dev, dma_addr, size,
1471 iommu, attr == DEV_DMA_COHERENT);
1472
1473 return 0;
1474}
1475EXPORT_SYMBOL_GPL(acpi_dma_configure);
1476
1477static void acpi_init_coherency(struct acpi_device *adev)
1478{
1479 unsigned long long cca = 0;
1480 acpi_status status;
1481 struct acpi_device *parent = adev->parent;
1482
1483 if (parent && parent->flags.cca_seen) {
1484 /*
1485 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1486 * already saw one.
1487 */
1488 adev->flags.cca_seen = 1;
1489 cca = parent->flags.coherent_dma;
1490 } else {
1491 status = acpi_evaluate_integer(adev->handle, "_CCA",
1492 NULL, &cca);
1493 if (ACPI_SUCCESS(status))
1494 adev->flags.cca_seen = 1;
1495 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1496 /*
1497 * If architecture does not specify that _CCA is
1498 * required for DMA-able devices (e.g. x86),
1499 * we default to _CCA=1.
1500 */
1501 cca = 1;
1502 else
1503 acpi_handle_debug(adev->handle,
1504 "ACPI device is missing _CCA.\n");
1505 }
1506
1507 adev->flags.coherent_dma = cca;
1508}
1509
1510static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1511{
1512 bool *is_serial_bus_slave_p = data;
1513
1514 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1515 return 1;
1516
1517 *is_serial_bus_slave_p = true;
1518
1519 /* no need to do more checking */
1520 return -1;
1521}
1522
1523static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1524{
1525 struct acpi_device *parent = device->parent;
1526 static const struct acpi_device_id indirect_io_hosts[] = {
1527 {"HISI0191", 0},
1528 {}
1529 };
1530
1531 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1532}
1533
1534static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1535{
1536 struct list_head resource_list;
1537 bool is_serial_bus_slave = false;
1538 /*
1539 * These devices have multiple I2cSerialBus resources and an i2c-client
1540 * must be instantiated for each, each with its own i2c_device_id.
1541 * Normally we only instantiate an i2c-client for the first resource,
1542 * using the ACPI HID as id. These special cases are handled by the
1543 * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1544 * which i2c_device_id to use for each resource.
1545 */
1546 static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1547 {"BSG1160", },
1548 {"BSG2150", },
1549 {"INT33FE", },
1550 {"INT3515", },
1551 {}
1552 };
1553
1554 if (acpi_is_indirect_io_slave(device))
1555 return true;
1556
1557 /* Macs use device properties in lieu of _CRS resources */
1558 if (x86_apple_machine &&
1559 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1560 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1561 fwnode_property_present(&device->fwnode, "baud")))
1562 return true;
1563
1564 /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1565 if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1566 return false;
1567
1568 INIT_LIST_HEAD(&resource_list);
1569 acpi_dev_get_resources(device, &resource_list,
1570 acpi_check_serial_bus_slave,
1571 &is_serial_bus_slave);
1572 acpi_dev_free_resource_list(&resource_list);
1573
1574 return is_serial_bus_slave;
1575}
1576
1577void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1578 int type, unsigned long long sta)
1579{
1580 INIT_LIST_HEAD(&device->pnp.ids);
1581 device->device_type = type;
1582 device->handle = handle;
1583 device->parent = acpi_bus_get_parent(handle);
1584 device->fwnode.ops = &acpi_device_fwnode_ops;
1585 acpi_set_device_status(device, sta);
1586 acpi_device_get_busid(device);
1587 acpi_set_pnp_ids(handle, &device->pnp, type);
1588 acpi_init_properties(device);
1589 acpi_bus_get_flags(device);
1590 device->flags.match_driver = false;
1591 device->flags.initialized = true;
1592 device->flags.enumeration_by_parent =
1593 acpi_device_enumeration_by_parent(device);
1594 acpi_device_clear_enumerated(device);
1595 device_initialize(&device->dev);
1596 dev_set_uevent_suppress(&device->dev, true);
1597 acpi_init_coherency(device);
1598 /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1599 device->dep_unmet = 1;
1600}
1601
1602void acpi_device_add_finalize(struct acpi_device *device)
1603{
1604 dev_set_uevent_suppress(&device->dev, false);
1605 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1606}
1607
1608static int acpi_add_single_object(struct acpi_device **child,
1609 acpi_handle handle, int type,
1610 unsigned long long sta)
1611{
1612 int result;
1613 struct acpi_device *device;
1614 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1615
1616 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1617 if (!device) {
1618 printk(KERN_ERR PREFIX "Memory allocation error\n");
1619 return -ENOMEM;
1620 }
1621
1622 acpi_init_device_object(device, handle, type, sta);
1623 /*
1624 * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1625 * that we can call acpi_bus_get_status() and use its quirk handling.
1626 * Note this must be done before the get power-/wakeup_dev-flags calls.
1627 */
1628 if (type == ACPI_BUS_TYPE_DEVICE)
1629 if (acpi_bus_get_status(device) < 0)
1630 acpi_set_device_status(device, 0);
1631
1632 acpi_bus_get_power_flags(device);
1633 acpi_bus_get_wakeup_device_flags(device);
1634
1635 result = acpi_device_add(device, acpi_device_release);
1636 if (result) {
1637 acpi_device_release(&device->dev);
1638 return result;
1639 }
1640
1641 acpi_power_add_remove_device(device, true);
1642 acpi_device_add_finalize(device);
1643 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1644 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1645 dev_name(&device->dev), (char *) buffer.pointer,
1646 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1647 kfree(buffer.pointer);
1648 *child = device;
1649 return 0;
1650}
1651
1652static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1653 void *context)
1654{
1655 struct resource *res = context;
1656
1657 if (acpi_dev_resource_memory(ares, res))
1658 return AE_CTRL_TERMINATE;
1659
1660 return AE_OK;
1661}
1662
1663static bool acpi_device_should_be_hidden(acpi_handle handle)
1664{
1665 acpi_status status;
1666 struct resource res;
1667
1668 /* Check if it should ignore the UART device */
1669 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1670 return false;
1671
1672 /*
1673 * The UART device described in SPCR table is assumed to have only one
1674 * memory resource present. So we only look for the first one here.
1675 */
1676 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1677 acpi_get_resource_memory, &res);
1678 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1679 return false;
1680
1681 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1682 &res.start);
1683
1684 return true;
1685}
1686
1687static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1688 unsigned long long *sta)
1689{
1690 acpi_status status;
1691 acpi_object_type acpi_type;
1692
1693 status = acpi_get_type(handle, &acpi_type);
1694 if (ACPI_FAILURE(status))
1695 return -ENODEV;
1696
1697 switch (acpi_type) {
1698 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1699 case ACPI_TYPE_DEVICE:
1700 if (acpi_device_should_be_hidden(handle))
1701 return -ENODEV;
1702
1703 *type = ACPI_BUS_TYPE_DEVICE;
1704 /*
1705 * acpi_add_single_object updates this once we've an acpi_device
1706 * so that acpi_bus_get_status' quirk handling can be used.
1707 */
1708 *sta = ACPI_STA_DEFAULT;
1709 break;
1710 case ACPI_TYPE_PROCESSOR:
1711 *type = ACPI_BUS_TYPE_PROCESSOR;
1712 status = acpi_bus_get_status_handle(handle, sta);
1713 if (ACPI_FAILURE(status))
1714 return -ENODEV;
1715 break;
1716 case ACPI_TYPE_THERMAL:
1717 *type = ACPI_BUS_TYPE_THERMAL;
1718 *sta = ACPI_STA_DEFAULT;
1719 break;
1720 case ACPI_TYPE_POWER:
1721 *type = ACPI_BUS_TYPE_POWER;
1722 *sta = ACPI_STA_DEFAULT;
1723 break;
1724 default:
1725 return -ENODEV;
1726 }
1727
1728 return 0;
1729}
1730
1731bool acpi_device_is_present(const struct acpi_device *adev)
1732{
1733 return adev->status.present || adev->status.functional;
1734}
1735
1736static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1737 const char *idstr,
1738 const struct acpi_device_id **matchid)
1739{
1740 const struct acpi_device_id *devid;
1741
1742 if (handler->match)
1743 return handler->match(idstr, matchid);
1744
1745 for (devid = handler->ids; devid->id[0]; devid++)
1746 if (!strcmp((char *)devid->id, idstr)) {
1747 if (matchid)
1748 *matchid = devid;
1749
1750 return true;
1751 }
1752
1753 return false;
1754}
1755
1756static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1757 const struct acpi_device_id **matchid)
1758{
1759 struct acpi_scan_handler *handler;
1760
1761 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1762 if (acpi_scan_handler_matching(handler, idstr, matchid))
1763 return handler;
1764
1765 return NULL;
1766}
1767
1768void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1769{
1770 if (!!hotplug->enabled == !!val)
1771 return;
1772
1773 mutex_lock(&acpi_scan_lock);
1774
1775 hotplug->enabled = val;
1776
1777 mutex_unlock(&acpi_scan_lock);
1778}
1779
1780static void acpi_scan_init_hotplug(struct acpi_device *adev)
1781{
1782 struct acpi_hardware_id *hwid;
1783
1784 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1785 acpi_dock_add(adev);
1786 return;
1787 }
1788 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1789 struct acpi_scan_handler *handler;
1790
1791 handler = acpi_scan_match_handler(hwid->id, NULL);
1792 if (handler) {
1793 adev->flags.hotplug_notify = true;
1794 break;
1795 }
1796 }
1797}
1798
1799static void acpi_device_dep_initialize(struct acpi_device *adev)
1800{
1801 struct acpi_dep_data *dep;
1802 struct acpi_handle_list dep_devices;
1803 acpi_status status;
1804 int i;
1805
1806 adev->dep_unmet = 0;
1807
1808 if (!acpi_has_method(adev->handle, "_DEP"))
1809 return;
1810
1811 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1812 &dep_devices);
1813 if (ACPI_FAILURE(status)) {
1814 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1815 return;
1816 }
1817
1818 for (i = 0; i < dep_devices.count; i++) {
1819 struct acpi_device_info *info;
1820 int skip;
1821
1822 status = acpi_get_object_info(dep_devices.handles[i], &info);
1823 if (ACPI_FAILURE(status)) {
1824 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1825 continue;
1826 }
1827
1828 /*
1829 * Skip the dependency of Windows System Power
1830 * Management Controller
1831 */
1832 skip = info->valid & ACPI_VALID_HID &&
1833 !strcmp(info->hardware_id.string, "INT3396");
1834
1835 kfree(info);
1836
1837 if (skip)
1838 continue;
1839
1840 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1841 if (!dep)
1842 return;
1843
1844 dep->master = dep_devices.handles[i];
1845 dep->slave = adev->handle;
1846 adev->dep_unmet++;
1847
1848 mutex_lock(&acpi_dep_list_lock);
1849 list_add_tail(&dep->node , &acpi_dep_list);
1850 mutex_unlock(&acpi_dep_list_lock);
1851 }
1852}
1853
1854static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1855 void *not_used, void **return_value)
1856{
1857 struct acpi_device *device = NULL;
1858 int type;
1859 unsigned long long sta;
1860 int result;
1861
1862 acpi_bus_get_device(handle, &device);
1863 if (device)
1864 goto out;
1865
1866 result = acpi_bus_type_and_status(handle, &type, &sta);
1867 if (result)
1868 return AE_OK;
1869
1870 if (type == ACPI_BUS_TYPE_POWER) {
1871 acpi_add_power_resource(handle);
1872 return AE_OK;
1873 }
1874
1875 acpi_add_single_object(&device, handle, type, sta);
1876 if (!device)
1877 return AE_CTRL_DEPTH;
1878
1879 acpi_scan_init_hotplug(device);
1880 acpi_device_dep_initialize(device);
1881
1882 out:
1883 if (!*return_value)
1884 *return_value = device;
1885
1886 return AE_OK;
1887}
1888
1889static void acpi_default_enumeration(struct acpi_device *device)
1890{
1891 /*
1892 * Do not enumerate devices with enumeration_by_parent flag set as
1893 * they will be enumerated by their respective parents.
1894 */
1895 if (!device->flags.enumeration_by_parent) {
1896 acpi_create_platform_device(device, NULL);
1897 acpi_device_set_enumerated(device);
1898 } else {
1899 blocking_notifier_call_chain(&acpi_reconfig_chain,
1900 ACPI_RECONFIG_DEVICE_ADD, device);
1901 }
1902}
1903
1904static const struct acpi_device_id generic_device_ids[] = {
1905 {ACPI_DT_NAMESPACE_HID, },
1906 {"", },
1907};
1908
1909static int acpi_generic_device_attach(struct acpi_device *adev,
1910 const struct acpi_device_id *not_used)
1911{
1912 /*
1913 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1914 * below can be unconditional.
1915 */
1916 if (adev->data.of_compatible)
1917 acpi_default_enumeration(adev);
1918
1919 return 1;
1920}
1921
1922static struct acpi_scan_handler generic_device_handler = {
1923 .ids = generic_device_ids,
1924 .attach = acpi_generic_device_attach,
1925};
1926
1927static int acpi_scan_attach_handler(struct acpi_device *device)
1928{
1929 struct acpi_hardware_id *hwid;
1930 int ret = 0;
1931
1932 list_for_each_entry(hwid, &device->pnp.ids, list) {
1933 const struct acpi_device_id *devid;
1934 struct acpi_scan_handler *handler;
1935
1936 handler = acpi_scan_match_handler(hwid->id, &devid);
1937 if (handler) {
1938 if (!handler->attach) {
1939 device->pnp.type.platform_id = 0;
1940 continue;
1941 }
1942 device->handler = handler;
1943 ret = handler->attach(device, devid);
1944 if (ret > 0)
1945 break;
1946
1947 device->handler = NULL;
1948 if (ret < 0)
1949 break;
1950 }
1951 }
1952
1953 return ret;
1954}
1955
1956static void acpi_bus_attach(struct acpi_device *device)
1957{
1958 struct acpi_device *child;
1959 acpi_handle ejd;
1960 int ret;
1961
1962 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1963 register_dock_dependent_device(device, ejd);
1964
1965 acpi_bus_get_status(device);
1966 /* Skip devices that are not present. */
1967 if (!acpi_device_is_present(device)) {
1968 device->flags.initialized = false;
1969 acpi_device_clear_enumerated(device);
1970 device->flags.power_manageable = 0;
1971 return;
1972 }
1973 if (device->handler)
1974 goto ok;
1975
1976 if (!device->flags.initialized) {
1977 device->flags.power_manageable =
1978 device->power.states[ACPI_STATE_D0].flags.valid;
1979 if (acpi_bus_init_power(device))
1980 device->flags.power_manageable = 0;
1981
1982 device->flags.initialized = true;
1983 } else if (device->flags.visited) {
1984 goto ok;
1985 }
1986
1987 ret = acpi_scan_attach_handler(device);
1988 if (ret < 0)
1989 return;
1990
1991 device->flags.match_driver = true;
1992 if (ret > 0 && !device->flags.enumeration_by_parent) {
1993 acpi_device_set_enumerated(device);
1994 goto ok;
1995 }
1996
1997 ret = device_attach(&device->dev);
1998 if (ret < 0)
1999 return;
2000
2001 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2002 acpi_default_enumeration(device);
2003 else
2004 acpi_device_set_enumerated(device);
2005
2006 ok:
2007 list_for_each_entry(child, &device->children, node)
2008 acpi_bus_attach(child);
2009
2010 if (device->handler && device->handler->hotplug.notify_online)
2011 device->handler->hotplug.notify_online(device);
2012}
2013
2014void acpi_walk_dep_device_list(acpi_handle handle)
2015{
2016 struct acpi_dep_data *dep, *tmp;
2017 struct acpi_device *adev;
2018
2019 mutex_lock(&acpi_dep_list_lock);
2020 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2021 if (dep->master == handle) {
2022 acpi_bus_get_device(dep->slave, &adev);
2023 if (!adev)
2024 continue;
2025
2026 adev->dep_unmet--;
2027 if (!adev->dep_unmet)
2028 acpi_bus_attach(adev);
2029 list_del(&dep->node);
2030 kfree(dep);
2031 }
2032 }
2033 mutex_unlock(&acpi_dep_list_lock);
2034}
2035EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2036
2037/**
2038 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2039 * @handle: Root of the namespace scope to scan.
2040 *
2041 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2042 * found devices.
2043 *
2044 * If no devices were found, -ENODEV is returned, but it does not mean that
2045 * there has been a real error. There just have been no suitable ACPI objects
2046 * in the table trunk from which the kernel could create a device and add an
2047 * appropriate driver.
2048 *
2049 * Must be called under acpi_scan_lock.
2050 */
2051int acpi_bus_scan(acpi_handle handle)
2052{
2053 void *device = NULL;
2054
2055 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2056 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2057 acpi_bus_check_add, NULL, NULL, &device);
2058
2059 if (device) {
2060 acpi_bus_attach(device);
2061 return 0;
2062 }
2063 return -ENODEV;
2064}
2065EXPORT_SYMBOL(acpi_bus_scan);
2066
2067/**
2068 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2069 * @adev: Root of the ACPI namespace scope to walk.
2070 *
2071 * Must be called under acpi_scan_lock.
2072 */
2073void acpi_bus_trim(struct acpi_device *adev)
2074{
2075 struct acpi_scan_handler *handler = adev->handler;
2076 struct acpi_device *child;
2077
2078 list_for_each_entry_reverse(child, &adev->children, node)
2079 acpi_bus_trim(child);
2080
2081 adev->flags.match_driver = false;
2082 if (handler) {
2083 if (handler->detach)
2084 handler->detach(adev);
2085
2086 adev->handler = NULL;
2087 } else {
2088 device_release_driver(&adev->dev);
2089 }
2090 /*
2091 * Most likely, the device is going away, so put it into D3cold before
2092 * that.
2093 */
2094 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2095 adev->flags.initialized = false;
2096 acpi_device_clear_enumerated(adev);
2097}
2098EXPORT_SYMBOL_GPL(acpi_bus_trim);
2099
2100int acpi_bus_register_early_device(int type)
2101{
2102 struct acpi_device *device = NULL;
2103 int result;
2104
2105 result = acpi_add_single_object(&device, NULL,
2106 type, ACPI_STA_DEFAULT);
2107 if (result)
2108 return result;
2109
2110 device->flags.match_driver = true;
2111 return device_attach(&device->dev);
2112}
2113EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2114
2115static int acpi_bus_scan_fixed(void)
2116{
2117 int result = 0;
2118
2119 /*
2120 * Enumerate all fixed-feature devices.
2121 */
2122 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2123 struct acpi_device *device = NULL;
2124
2125 result = acpi_add_single_object(&device, NULL,
2126 ACPI_BUS_TYPE_POWER_BUTTON,
2127 ACPI_STA_DEFAULT);
2128 if (result)
2129 return result;
2130
2131 device->flags.match_driver = true;
2132 result = device_attach(&device->dev);
2133 if (result < 0)
2134 return result;
2135
2136 device_init_wakeup(&device->dev, true);
2137 }
2138
2139 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2140 struct acpi_device *device = NULL;
2141
2142 result = acpi_add_single_object(&device, NULL,
2143 ACPI_BUS_TYPE_SLEEP_BUTTON,
2144 ACPI_STA_DEFAULT);
2145 if (result)
2146 return result;
2147
2148 device->flags.match_driver = true;
2149 result = device_attach(&device->dev);
2150 }
2151
2152 return result < 0 ? result : 0;
2153}
2154
2155static void __init acpi_get_spcr_uart_addr(void)
2156{
2157 acpi_status status;
2158 struct acpi_table_spcr *spcr_ptr;
2159
2160 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2161 (struct acpi_table_header **)&spcr_ptr);
2162 if (ACPI_SUCCESS(status))
2163 spcr_uart_addr = spcr_ptr->serial_port.address;
2164 else
2165 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2166}
2167
2168static bool acpi_scan_initialized;
2169
2170int __init acpi_scan_init(void)
2171{
2172 int result;
2173 acpi_status status;
2174 struct acpi_table_stao *stao_ptr;
2175
2176 acpi_pci_root_init();
2177 acpi_pci_link_init();
2178 acpi_processor_init();
2179 acpi_lpss_init();
2180 acpi_apd_init();
2181 acpi_cmos_rtc_init();
2182 acpi_container_init();
2183 acpi_memory_hotplug_init();
2184 acpi_watchdog_init();
2185 acpi_pnp_init();
2186 acpi_int340x_thermal_init();
2187 acpi_amba_init();
2188 acpi_init_lpit();
2189
2190 acpi_scan_add_handler(&generic_device_handler);
2191
2192 /*
2193 * If there is STAO table, check whether it needs to ignore the UART
2194 * device in SPCR table.
2195 */
2196 status = acpi_get_table(ACPI_SIG_STAO, 0,
2197 (struct acpi_table_header **)&stao_ptr);
2198 if (ACPI_SUCCESS(status)) {
2199 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2200 printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2201
2202 if (stao_ptr->ignore_uart)
2203 acpi_get_spcr_uart_addr();
2204 }
2205
2206 acpi_gpe_apply_masked_gpes();
2207 acpi_update_all_gpes();
2208
2209 mutex_lock(&acpi_scan_lock);
2210 /*
2211 * Enumerate devices in the ACPI namespace.
2212 */
2213 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2214 if (result)
2215 goto out;
2216
2217 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2218 if (result)
2219 goto out;
2220
2221 /* Fixed feature devices do not exist on HW-reduced platform */
2222 if (!acpi_gbl_reduced_hardware) {
2223 result = acpi_bus_scan_fixed();
2224 if (result) {
2225 acpi_detach_data(acpi_root->handle,
2226 acpi_scan_drop_device);
2227 acpi_device_del(acpi_root);
2228 put_device(&acpi_root->dev);
2229 goto out;
2230 }
2231 }
2232
2233 acpi_scan_initialized = true;
2234
2235 out:
2236 mutex_unlock(&acpi_scan_lock);
2237 return result;
2238}
2239
2240static struct acpi_probe_entry *ape;
2241static int acpi_probe_count;
2242static DEFINE_MUTEX(acpi_probe_mutex);
2243
2244static int __init acpi_match_madt(struct acpi_subtable_header *header,
2245 const unsigned long end)
2246{
2247 if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2248 if (!ape->probe_subtbl(header, end))
2249 acpi_probe_count++;
2250
2251 return 0;
2252}
2253
2254int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2255{
2256 int count = 0;
2257
2258 if (acpi_disabled)
2259 return 0;
2260
2261 mutex_lock(&acpi_probe_mutex);
2262 for (ape = ap_head; nr; ape++, nr--) {
2263 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2264 acpi_probe_count = 0;
2265 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2266 count += acpi_probe_count;
2267 } else {
2268 int res;
2269 res = acpi_table_parse(ape->id, ape->probe_table);
2270 if (!res)
2271 count++;
2272 }
2273 }
2274 mutex_unlock(&acpi_probe_mutex);
2275
2276 return count;
2277}
2278
2279struct acpi_table_events_work {
2280 struct work_struct work;
2281 void *table;
2282 u32 event;
2283};
2284
2285static void acpi_table_events_fn(struct work_struct *work)
2286{
2287 struct acpi_table_events_work *tew;
2288
2289 tew = container_of(work, struct acpi_table_events_work, work);
2290
2291 if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2292 acpi_scan_lock_acquire();
2293 acpi_bus_scan(ACPI_ROOT_OBJECT);
2294 acpi_scan_lock_release();
2295 }
2296
2297 kfree(tew);
2298}
2299
2300void acpi_scan_table_handler(u32 event, void *table, void *context)
2301{
2302 struct acpi_table_events_work *tew;
2303
2304 if (!acpi_scan_initialized)
2305 return;
2306
2307 if (event != ACPI_TABLE_EVENT_LOAD)
2308 return;
2309
2310 tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2311 if (!tew)
2312 return;
2313
2314 INIT_WORK(&tew->work, acpi_table_events_fn);
2315 tew->table = table;
2316 tew->event = event;
2317
2318 schedule_work(&tew->work);
2319}
2320
2321int acpi_reconfig_notifier_register(struct notifier_block *nb)
2322{
2323 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2324}
2325EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2326
2327int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2328{
2329 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2330}
2331EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
2332