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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/signal.h>
11#include <linux/kthread.h>
12#include <linux/dmi.h>
13
14#include <acpi/acpi_drivers.h>
15
16#include "internal.h"
17
18#define _COMPONENT ACPI_BUS_COMPONENT
19ACPI_MODULE_NAME("scan");
20#define STRUCT_TO_INT(s) (*((int*)&s))
21extern struct acpi_device *acpi_root;
22
23#define ACPI_BUS_CLASS "system_bus"
24#define ACPI_BUS_HID "LNXSYBUS"
25#define ACPI_BUS_DEVICE_NAME "System Bus"
26
27#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
28
29static const char *dummy_hid = "device";
30
31static LIST_HEAD(acpi_device_list);
32static LIST_HEAD(acpi_bus_id_list);
33DEFINE_MUTEX(acpi_device_lock);
34LIST_HEAD(acpi_wakeup_device_list);
35
36struct acpi_device_bus_id{
37 char bus_id[15];
38 unsigned int instance_no;
39 struct list_head node;
40};
41
42/*
43 * Creates hid/cid(s) string needed for modalias and uevent
44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45 * char *modalias: "acpi:IBM0001:ACPI0001"
46*/
47static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
48 int size)
49{
50 int len;
51 int count;
52 struct acpi_hardware_id *id;
53
54 if (list_empty(&acpi_dev->pnp.ids))
55 return 0;
56
57 len = snprintf(modalias, size, "acpi:");
58 size -= len;
59
60 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
61 count = snprintf(&modalias[len], size, "%s:", id->id);
62 if (count < 0 || count >= size)
63 return -EINVAL;
64 len += count;
65 size -= count;
66 }
67
68 modalias[len] = '\0';
69 return len;
70}
71
72static ssize_t
73acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
74 struct acpi_device *acpi_dev = to_acpi_device(dev);
75 int len;
76
77 /* Device has no HID and no CID or string is >1024 */
78 len = create_modalias(acpi_dev, buf, 1024);
79 if (len <= 0)
80 return 0;
81 buf[len++] = '\n';
82 return len;
83}
84static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
85
86static void acpi_bus_hot_remove_device(void *context)
87{
88 struct acpi_device *device;
89 acpi_handle handle = context;
90 struct acpi_object_list arg_list;
91 union acpi_object arg;
92 acpi_status status = AE_OK;
93
94 if (acpi_bus_get_device(handle, &device))
95 return;
96
97 if (!device)
98 return;
99
100 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
101 "Hot-removing device %s...\n", dev_name(&device->dev)));
102
103 if (acpi_bus_trim(device, 1)) {
104 printk(KERN_ERR PREFIX
105 "Removing device failed\n");
106 return;
107 }
108
109 /* power off device */
110 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
111 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
112 printk(KERN_WARNING PREFIX
113 "Power-off device failed\n");
114
115 if (device->flags.lockable) {
116 arg_list.count = 1;
117 arg_list.pointer = &arg;
118 arg.type = ACPI_TYPE_INTEGER;
119 arg.integer.value = 0;
120 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
121 }
122
123 arg_list.count = 1;
124 arg_list.pointer = &arg;
125 arg.type = ACPI_TYPE_INTEGER;
126 arg.integer.value = 1;
127
128 /*
129 * TBD: _EJD support.
130 */
131 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
132 if (ACPI_FAILURE(status))
133 printk(KERN_WARNING PREFIX
134 "Eject device failed\n");
135
136 return;
137}
138
139static ssize_t
140acpi_eject_store(struct device *d, struct device_attribute *attr,
141 const char *buf, size_t count)
142{
143 int ret = count;
144 acpi_status status;
145 acpi_object_type type = 0;
146 struct acpi_device *acpi_device = to_acpi_device(d);
147
148 if ((!count) || (buf[0] != '1')) {
149 return -EINVAL;
150 }
151#ifndef FORCE_EJECT
152 if (acpi_device->driver == NULL) {
153 ret = -ENODEV;
154 goto err;
155 }
156#endif
157 status = acpi_get_type(acpi_device->handle, &type);
158 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
159 ret = -ENODEV;
160 goto err;
161 }
162
163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
164err:
165 return ret;
166}
167
168static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
169
170static ssize_t
171acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
172 struct acpi_device *acpi_dev = to_acpi_device(dev);
173
174 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
175}
176static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
177
178static ssize_t
179acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
180 struct acpi_device *acpi_dev = to_acpi_device(dev);
181 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
182 int result;
183
184 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
185 if (result)
186 goto end;
187
188 result = sprintf(buf, "%s\n", (char*)path.pointer);
189 kfree(path.pointer);
190end:
191 return result;
192}
193static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
194
195static int acpi_device_setup_files(struct acpi_device *dev)
196{
197 acpi_status status;
198 acpi_handle temp;
199 int result = 0;
200
201 /*
202 * Devices gotten from FADT don't have a "path" attribute
203 */
204 if (dev->handle) {
205 result = device_create_file(&dev->dev, &dev_attr_path);
206 if (result)
207 goto end;
208 }
209
210 if (!list_empty(&dev->pnp.ids)) {
211 result = device_create_file(&dev->dev, &dev_attr_hid);
212 if (result)
213 goto end;
214
215 result = device_create_file(&dev->dev, &dev_attr_modalias);
216 if (result)
217 goto end;
218 }
219
220 /*
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
223 */
224 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225 if (ACPI_SUCCESS(status))
226 result = device_create_file(&dev->dev, &dev_attr_eject);
227end:
228 return result;
229}
230
231static void acpi_device_remove_files(struct acpi_device *dev)
232{
233 acpi_status status;
234 acpi_handle temp;
235
236 /*
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
239 */
240 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241 if (ACPI_SUCCESS(status))
242 device_remove_file(&dev->dev, &dev_attr_eject);
243
244 device_remove_file(&dev->dev, &dev_attr_modalias);
245 device_remove_file(&dev->dev, &dev_attr_hid);
246 if (dev->handle)
247 device_remove_file(&dev->dev, &dev_attr_path);
248}
249/* --------------------------------------------------------------------------
250 ACPI Bus operations
251 -------------------------------------------------------------------------- */
252
253int acpi_match_device_ids(struct acpi_device *device,
254 const struct acpi_device_id *ids)
255{
256 const struct acpi_device_id *id;
257 struct acpi_hardware_id *hwid;
258
259 /*
260 * If the device is not present, it is unnecessary to load device
261 * driver for it.
262 */
263 if (!device->status.present)
264 return -ENODEV;
265
266 for (id = ids; id->id[0]; id++)
267 list_for_each_entry(hwid, &device->pnp.ids, list)
268 if (!strcmp((char *) id->id, hwid->id))
269 return 0;
270
271 return -ENOENT;
272}
273EXPORT_SYMBOL(acpi_match_device_ids);
274
275static void acpi_free_ids(struct acpi_device *device)
276{
277 struct acpi_hardware_id *id, *tmp;
278
279 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
280 kfree(id->id);
281 kfree(id);
282 }
283}
284
285static void acpi_device_release(struct device *dev)
286{
287 struct acpi_device *acpi_dev = to_acpi_device(dev);
288
289 acpi_free_ids(acpi_dev);
290 kfree(acpi_dev);
291}
292
293static int acpi_device_suspend(struct device *dev, pm_message_t state)
294{
295 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 struct acpi_driver *acpi_drv = acpi_dev->driver;
297
298 if (acpi_drv && acpi_drv->ops.suspend)
299 return acpi_drv->ops.suspend(acpi_dev, state);
300 return 0;
301}
302
303static int acpi_device_resume(struct device *dev)
304{
305 struct acpi_device *acpi_dev = to_acpi_device(dev);
306 struct acpi_driver *acpi_drv = acpi_dev->driver;
307
308 if (acpi_drv && acpi_drv->ops.resume)
309 return acpi_drv->ops.resume(acpi_dev);
310 return 0;
311}
312
313static int acpi_bus_match(struct device *dev, struct device_driver *drv)
314{
315 struct acpi_device *acpi_dev = to_acpi_device(dev);
316 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
317
318 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
319}
320
321static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
322{
323 struct acpi_device *acpi_dev = to_acpi_device(dev);
324 int len;
325
326 if (list_empty(&acpi_dev->pnp.ids))
327 return 0;
328
329 if (add_uevent_var(env, "MODALIAS="))
330 return -ENOMEM;
331 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
332 sizeof(env->buf) - env->buflen);
333 if (len >= (sizeof(env->buf) - env->buflen))
334 return -ENOMEM;
335 env->buflen += len;
336 return 0;
337}
338
339static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
340{
341 struct acpi_device *device = data;
342
343 device->driver->ops.notify(device, event);
344}
345
346static acpi_status acpi_device_notify_fixed(void *data)
347{
348 struct acpi_device *device = data;
349
350 /* Fixed hardware devices have no handles */
351 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
352 return AE_OK;
353}
354
355static int acpi_device_install_notify_handler(struct acpi_device *device)
356{
357 acpi_status status;
358
359 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
360 status =
361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
362 acpi_device_notify_fixed,
363 device);
364 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
365 status =
366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367 acpi_device_notify_fixed,
368 device);
369 else
370 status = acpi_install_notify_handler(device->handle,
371 ACPI_DEVICE_NOTIFY,
372 acpi_device_notify,
373 device);
374
375 if (ACPI_FAILURE(status))
376 return -EINVAL;
377 return 0;
378}
379
380static void acpi_device_remove_notify_handler(struct acpi_device *device)
381{
382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
384 acpi_device_notify_fixed);
385 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed);
388 else
389 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
390 acpi_device_notify);
391}
392
393static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
394static int acpi_start_single_object(struct acpi_device *);
395static int acpi_device_probe(struct device * dev)
396{
397 struct acpi_device *acpi_dev = to_acpi_device(dev);
398 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
399 int ret;
400
401 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
402 if (!ret) {
403 if (acpi_dev->bus_ops.acpi_op_start)
404 acpi_start_single_object(acpi_dev);
405
406 if (acpi_drv->ops.notify) {
407 ret = acpi_device_install_notify_handler(acpi_dev);
408 if (ret) {
409 if (acpi_drv->ops.remove)
410 acpi_drv->ops.remove(acpi_dev,
411 acpi_dev->removal_type);
412 return ret;
413 }
414 }
415
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "Found driver [%s] for device [%s]\n",
418 acpi_drv->name, acpi_dev->pnp.bus_id));
419 get_device(dev);
420 }
421 return ret;
422}
423
424static int acpi_device_remove(struct device * dev)
425{
426 struct acpi_device *acpi_dev = to_acpi_device(dev);
427 struct acpi_driver *acpi_drv = acpi_dev->driver;
428
429 if (acpi_drv) {
430 if (acpi_drv->ops.notify)
431 acpi_device_remove_notify_handler(acpi_dev);
432 if (acpi_drv->ops.remove)
433 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
434 }
435 acpi_dev->driver = NULL;
436 acpi_dev->driver_data = NULL;
437
438 put_device(dev);
439 return 0;
440}
441
442struct bus_type acpi_bus_type = {
443 .name = "acpi",
444 .suspend = acpi_device_suspend,
445 .resume = acpi_device_resume,
446 .match = acpi_bus_match,
447 .probe = acpi_device_probe,
448 .remove = acpi_device_remove,
449 .uevent = acpi_device_uevent,
450};
451
452static int acpi_device_register(struct acpi_device *device)
453{
454 int result;
455 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
456 int found = 0;
457
458 /*
459 * Linkage
460 * -------
461 * Link this device to its parent and siblings.
462 */
463 INIT_LIST_HEAD(&device->children);
464 INIT_LIST_HEAD(&device->node);
465 INIT_LIST_HEAD(&device->wakeup_list);
466
467 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
468 if (!new_bus_id) {
469 printk(KERN_ERR PREFIX "Memory allocation error\n");
470 return -ENOMEM;
471 }
472
473 mutex_lock(&acpi_device_lock);
474 /*
475 * Find suitable bus_id and instance number in acpi_bus_id_list
476 * If failed, create one and link it into acpi_bus_id_list
477 */
478 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
479 if (!strcmp(acpi_device_bus_id->bus_id,
480 acpi_device_hid(device))) {
481 acpi_device_bus_id->instance_no++;
482 found = 1;
483 kfree(new_bus_id);
484 break;
485 }
486 }
487 if (!found) {
488 acpi_device_bus_id = new_bus_id;
489 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
490 acpi_device_bus_id->instance_no = 0;
491 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
492 }
493 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
494
495 if (device->parent)
496 list_add_tail(&device->node, &device->parent->children);
497
498 if (device->wakeup.flags.valid)
499 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
500 mutex_unlock(&acpi_device_lock);
501
502 if (device->parent)
503 device->dev.parent = &device->parent->dev;
504 device->dev.bus = &acpi_bus_type;
505 device->dev.release = &acpi_device_release;
506 result = device_register(&device->dev);
507 if (result) {
508 dev_err(&device->dev, "Error registering device\n");
509 goto end;
510 }
511
512 result = acpi_device_setup_files(device);
513 if (result)
514 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
515 dev_name(&device->dev));
516
517 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
518 return 0;
519end:
520 mutex_lock(&acpi_device_lock);
521 if (device->parent)
522 list_del(&device->node);
523 list_del(&device->wakeup_list);
524 mutex_unlock(&acpi_device_lock);
525 return result;
526}
527
528static void acpi_device_unregister(struct acpi_device *device, int type)
529{
530 mutex_lock(&acpi_device_lock);
531 if (device->parent)
532 list_del(&device->node);
533
534 list_del(&device->wakeup_list);
535 mutex_unlock(&acpi_device_lock);
536
537 acpi_detach_data(device->handle, acpi_bus_data_handler);
538
539 acpi_device_remove_files(device);
540 device_unregister(&device->dev);
541}
542
543/* --------------------------------------------------------------------------
544 Driver Management
545 -------------------------------------------------------------------------- */
546/**
547 * acpi_bus_driver_init - add a device to a driver
548 * @device: the device to add and initialize
549 * @driver: driver for the device
550 *
551 * Used to initialize a device via its device driver. Called whenever a
552 * driver is bound to a device. Invokes the driver's add() ops.
553 */
554static int
555acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
556{
557 int result = 0;
558
559 if (!device || !driver)
560 return -EINVAL;
561
562 if (!driver->ops.add)
563 return -ENOSYS;
564
565 result = driver->ops.add(device);
566 if (result) {
567 device->driver = NULL;
568 device->driver_data = NULL;
569 return result;
570 }
571
572 device->driver = driver;
573
574 /*
575 * TBD - Configuration Management: Assign resources to device based
576 * upon possible configuration and currently allocated resources.
577 */
578
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580 "Driver successfully bound to device\n"));
581 return 0;
582}
583
584static int acpi_start_single_object(struct acpi_device *device)
585{
586 int result = 0;
587 struct acpi_driver *driver;
588
589
590 if (!(driver = device->driver))
591 return 0;
592
593 if (driver->ops.start) {
594 result = driver->ops.start(device);
595 if (result && driver->ops.remove)
596 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
597 }
598
599 return result;
600}
601
602/**
603 * acpi_bus_register_driver - register a driver with the ACPI bus
604 * @driver: driver being registered
605 *
606 * Registers a driver with the ACPI bus. Searches the namespace for all
607 * devices that match the driver's criteria and binds. Returns zero for
608 * success or a negative error status for failure.
609 */
610int acpi_bus_register_driver(struct acpi_driver *driver)
611{
612 int ret;
613
614 if (acpi_disabled)
615 return -ENODEV;
616 driver->drv.name = driver->name;
617 driver->drv.bus = &acpi_bus_type;
618 driver->drv.owner = driver->owner;
619
620 ret = driver_register(&driver->drv);
621 return ret;
622}
623
624EXPORT_SYMBOL(acpi_bus_register_driver);
625
626/**
627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628 * @driver: driver to unregister
629 *
630 * Unregisters a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and unbinds.
632 */
633void acpi_bus_unregister_driver(struct acpi_driver *driver)
634{
635 driver_unregister(&driver->drv);
636}
637
638EXPORT_SYMBOL(acpi_bus_unregister_driver);
639
640/* --------------------------------------------------------------------------
641 Device Enumeration
642 -------------------------------------------------------------------------- */
643static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
644{
645 acpi_status status;
646 int ret;
647 struct acpi_device *device;
648
649 /*
650 * Fixed hardware devices do not appear in the namespace and do not
651 * have handles, but we fabricate acpi_devices for them, so we have
652 * to deal with them specially.
653 */
654 if (handle == NULL)
655 return acpi_root;
656
657 do {
658 status = acpi_get_parent(handle, &handle);
659 if (status == AE_NULL_ENTRY)
660 return NULL;
661 if (ACPI_FAILURE(status))
662 return acpi_root;
663
664 ret = acpi_bus_get_device(handle, &device);
665 if (ret == 0)
666 return device;
667 } while (1);
668}
669
670acpi_status
671acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
672{
673 acpi_status status;
674 acpi_handle tmp;
675 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
676 union acpi_object *obj;
677
678 status = acpi_get_handle(handle, "_EJD", &tmp);
679 if (ACPI_FAILURE(status))
680 return status;
681
682 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
683 if (ACPI_SUCCESS(status)) {
684 obj = buffer.pointer;
685 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
686 ejd);
687 kfree(buffer.pointer);
688 }
689 return status;
690}
691EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
692
693void acpi_bus_data_handler(acpi_handle handle, void *context)
694{
695
696 /* TBD */
697
698 return;
699}
700
701static int acpi_bus_get_perf_flags(struct acpi_device *device)
702{
703 device->performance.state = ACPI_STATE_UNKNOWN;
704 return 0;
705}
706
707static acpi_status
708acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
709 struct acpi_device_wakeup *wakeup)
710{
711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
713 union acpi_object *element = NULL;
714 acpi_status status;
715 int i = 0;
716
717 if (!wakeup)
718 return AE_BAD_PARAMETER;
719
720 /* _PRW */
721 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
722 if (ACPI_FAILURE(status)) {
723 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
724 return status;
725 }
726
727 package = (union acpi_object *)buffer.pointer;
728
729 if (!package || (package->package.count < 2)) {
730 status = AE_BAD_DATA;
731 goto out;
732 }
733
734 element = &(package->package.elements[0]);
735 if (!element) {
736 status = AE_BAD_DATA;
737 goto out;
738 }
739 if (element->type == ACPI_TYPE_PACKAGE) {
740 if ((element->package.count < 2) ||
741 (element->package.elements[0].type !=
742 ACPI_TYPE_LOCAL_REFERENCE)
743 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
744 status = AE_BAD_DATA;
745 goto out;
746 }
747 wakeup->gpe_device =
748 element->package.elements[0].reference.handle;
749 wakeup->gpe_number =
750 (u32) element->package.elements[1].integer.value;
751 } else if (element->type == ACPI_TYPE_INTEGER) {
752 wakeup->gpe_device = NULL;
753 wakeup->gpe_number = element->integer.value;
754 } else {
755 status = AE_BAD_DATA;
756 goto out;
757 }
758
759 element = &(package->package.elements[1]);
760 if (element->type != ACPI_TYPE_INTEGER) {
761 status = AE_BAD_DATA;
762 goto out;
763 }
764 wakeup->sleep_state = element->integer.value;
765
766 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
767 status = AE_NO_MEMORY;
768 goto out;
769 }
770 wakeup->resources.count = package->package.count - 2;
771 for (i = 0; i < wakeup->resources.count; i++) {
772 element = &(package->package.elements[i + 2]);
773 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
774 status = AE_BAD_DATA;
775 goto out;
776 }
777
778 wakeup->resources.handles[i] = element->reference.handle;
779 }
780
781 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
782
783 out:
784 kfree(buffer.pointer);
785
786 return status;
787}
788
789static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
790{
791 struct acpi_device_id button_device_ids[] = {
792 {"PNP0C0D", 0},
793 {"PNP0C0C", 0},
794 {"PNP0C0E", 0},
795 {"", 0},
796 };
797 acpi_status status;
798 acpi_event_status event_status;
799
800 device->wakeup.flags.notifier_present = 0;
801
802 /* Power button, Lid switch always enable wakeup */
803 if (!acpi_match_device_ids(device, button_device_ids)) {
804 device->wakeup.flags.run_wake = 1;
805 device_set_wakeup_capable(&device->dev, true);
806 return;
807 }
808
809 status = acpi_get_gpe_status(device->wakeup.gpe_device,
810 device->wakeup.gpe_number,
811 &event_status);
812 if (status == AE_OK)
813 device->wakeup.flags.run_wake =
814 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
815}
816
817static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
818{
819 acpi_handle temp;
820 acpi_status status = 0;
821 int psw_error;
822
823 /* Presence of _PRW indicates wake capable */
824 status = acpi_get_handle(device->handle, "_PRW", &temp);
825 if (ACPI_FAILURE(status))
826 return;
827
828 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
829 &device->wakeup);
830 if (ACPI_FAILURE(status)) {
831 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
832 return;
833 }
834
835 device->wakeup.flags.valid = 1;
836 device->wakeup.prepare_count = 0;
837 acpi_bus_set_run_wake_flags(device);
838 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
839 * system for the ACPI device with the _PRW object.
840 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
841 * So it is necessary to call _DSW object first. Only when it is not
842 * present will the _PSW object used.
843 */
844 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
845 if (psw_error)
846 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847 "error in _DSW or _PSW evaluation\n"));
848}
849
850static void acpi_bus_add_power_resource(acpi_handle handle);
851
852static int acpi_bus_get_power_flags(struct acpi_device *device)
853{
854 acpi_status status = 0;
855 acpi_handle handle = NULL;
856 u32 i = 0;
857
858
859 /*
860 * Power Management Flags
861 */
862 status = acpi_get_handle(device->handle, "_PSC", &handle);
863 if (ACPI_SUCCESS(status))
864 device->power.flags.explicit_get = 1;
865 status = acpi_get_handle(device->handle, "_IRC", &handle);
866 if (ACPI_SUCCESS(status))
867 device->power.flags.inrush_current = 1;
868
869 /*
870 * Enumerate supported power management states
871 */
872 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
873 struct acpi_device_power_state *ps = &device->power.states[i];
874 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
875
876 /* Evaluate "_PRx" to se if power resources are referenced */
877 acpi_evaluate_reference(device->handle, object_name, NULL,
878 &ps->resources);
879 if (ps->resources.count) {
880 int j;
881
882 device->power.flags.power_resources = 1;
883 for (j = 0; j < ps->resources.count; j++)
884 acpi_bus_add_power_resource(ps->resources.handles[j]);
885 }
886
887 /* Evaluate "_PSx" to see if we can do explicit sets */
888 object_name[2] = 'S';
889 status = acpi_get_handle(device->handle, object_name, &handle);
890 if (ACPI_SUCCESS(status))
891 ps->flags.explicit_set = 1;
892
893 /*
894 * State is valid if there are means to put the device into it.
895 * D3hot is only valid if _PR3 present.
896 */
897 if (ps->resources.count ||
898 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
899 ps->flags.valid = 1;
900
901 ps->power = -1; /* Unknown - driver assigned */
902 ps->latency = -1; /* Unknown - driver assigned */
903 }
904
905 /* Set defaults for D0 and D3 states (always valid) */
906 device->power.states[ACPI_STATE_D0].flags.valid = 1;
907 device->power.states[ACPI_STATE_D0].power = 100;
908 device->power.states[ACPI_STATE_D3].flags.valid = 1;
909 device->power.states[ACPI_STATE_D3].power = 0;
910
911 /* Set D3cold's explicit_set flag if _PS3 exists. */
912 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
913 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
914
915 acpi_bus_init_power(device);
916
917 return 0;
918}
919
920static int acpi_bus_get_flags(struct acpi_device *device)
921{
922 acpi_status status = AE_OK;
923 acpi_handle temp = NULL;
924
925
926 /* Presence of _STA indicates 'dynamic_status' */
927 status = acpi_get_handle(device->handle, "_STA", &temp);
928 if (ACPI_SUCCESS(status))
929 device->flags.dynamic_status = 1;
930
931 /* Presence of _RMV indicates 'removable' */
932 status = acpi_get_handle(device->handle, "_RMV", &temp);
933 if (ACPI_SUCCESS(status))
934 device->flags.removable = 1;
935
936 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
937 status = acpi_get_handle(device->handle, "_EJD", &temp);
938 if (ACPI_SUCCESS(status))
939 device->flags.ejectable = 1;
940 else {
941 status = acpi_get_handle(device->handle, "_EJ0", &temp);
942 if (ACPI_SUCCESS(status))
943 device->flags.ejectable = 1;
944 }
945
946 /* Presence of _LCK indicates 'lockable' */
947 status = acpi_get_handle(device->handle, "_LCK", &temp);
948 if (ACPI_SUCCESS(status))
949 device->flags.lockable = 1;
950
951 /* Power resources cannot be power manageable. */
952 if (device->device_type == ACPI_BUS_TYPE_POWER)
953 return 0;
954
955 /* Presence of _PS0|_PR0 indicates 'power manageable' */
956 status = acpi_get_handle(device->handle, "_PS0", &temp);
957 if (ACPI_FAILURE(status))
958 status = acpi_get_handle(device->handle, "_PR0", &temp);
959 if (ACPI_SUCCESS(status))
960 device->flags.power_manageable = 1;
961
962 /* TBD: Performance management */
963
964 return 0;
965}
966
967static void acpi_device_get_busid(struct acpi_device *device)
968{
969 char bus_id[5] = { '?', 0 };
970 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
971 int i = 0;
972
973 /*
974 * Bus ID
975 * ------
976 * The device's Bus ID is simply the object name.
977 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
978 */
979 if (ACPI_IS_ROOT_DEVICE(device)) {
980 strcpy(device->pnp.bus_id, "ACPI");
981 return;
982 }
983
984 switch (device->device_type) {
985 case ACPI_BUS_TYPE_POWER_BUTTON:
986 strcpy(device->pnp.bus_id, "PWRF");
987 break;
988 case ACPI_BUS_TYPE_SLEEP_BUTTON:
989 strcpy(device->pnp.bus_id, "SLPF");
990 break;
991 default:
992 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
993 /* Clean up trailing underscores (if any) */
994 for (i = 3; i > 1; i--) {
995 if (bus_id[i] == '_')
996 bus_id[i] = '\0';
997 else
998 break;
999 }
1000 strcpy(device->pnp.bus_id, bus_id);
1001 break;
1002 }
1003}
1004
1005/*
1006 * acpi_bay_match - see if a device is an ejectable driver bay
1007 *
1008 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1009 * then we can safely call it an ejectable drive bay
1010 */
1011static int acpi_bay_match(struct acpi_device *device){
1012 acpi_status status;
1013 acpi_handle handle;
1014 acpi_handle tmp;
1015 acpi_handle phandle;
1016
1017 handle = device->handle;
1018
1019 status = acpi_get_handle(handle, "_EJ0", &tmp);
1020 if (ACPI_FAILURE(status))
1021 return -ENODEV;
1022
1023 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1024 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1025 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1026 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1027 return 0;
1028
1029 if (acpi_get_parent(handle, &phandle))
1030 return -ENODEV;
1031
1032 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1033 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1034 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1035 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1036 return 0;
1037
1038 return -ENODEV;
1039}
1040
1041/*
1042 * acpi_dock_match - see if a device has a _DCK method
1043 */
1044static int acpi_dock_match(struct acpi_device *device)
1045{
1046 acpi_handle tmp;
1047 return acpi_get_handle(device->handle, "_DCK", &tmp);
1048}
1049
1050const char *acpi_device_hid(struct acpi_device *device)
1051{
1052 struct acpi_hardware_id *hid;
1053
1054 if (list_empty(&device->pnp.ids))
1055 return dummy_hid;
1056
1057 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1058 return hid->id;
1059}
1060EXPORT_SYMBOL(acpi_device_hid);
1061
1062static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1063{
1064 struct acpi_hardware_id *id;
1065
1066 id = kmalloc(sizeof(*id), GFP_KERNEL);
1067 if (!id)
1068 return;
1069
1070 id->id = kstrdup(dev_id, GFP_KERNEL);
1071 if (!id->id) {
1072 kfree(id);
1073 return;
1074 }
1075
1076 list_add_tail(&id->list, &device->pnp.ids);
1077}
1078
1079/*
1080 * Old IBM workstations have a DSDT bug wherein the SMBus object
1081 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1082 * prefix. Work around this.
1083 */
1084static int acpi_ibm_smbus_match(struct acpi_device *device)
1085{
1086 acpi_handle h_dummy;
1087 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1088 int result;
1089
1090 if (!dmi_name_in_vendors("IBM"))
1091 return -ENODEV;
1092
1093 /* Look for SMBS object */
1094 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1095 if (result)
1096 return result;
1097
1098 if (strcmp("SMBS", path.pointer)) {
1099 result = -ENODEV;
1100 goto out;
1101 }
1102
1103 /* Does it have the necessary (but misnamed) methods? */
1104 result = -ENODEV;
1105 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1106 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1107 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1108 result = 0;
1109out:
1110 kfree(path.pointer);
1111 return result;
1112}
1113
1114static void acpi_device_set_id(struct acpi_device *device)
1115{
1116 acpi_status status;
1117 struct acpi_device_info *info;
1118 struct acpica_device_id_list *cid_list;
1119 int i;
1120
1121 switch (device->device_type) {
1122 case ACPI_BUS_TYPE_DEVICE:
1123 if (ACPI_IS_ROOT_DEVICE(device)) {
1124 acpi_add_id(device, ACPI_SYSTEM_HID);
1125 break;
1126 }
1127
1128 status = acpi_get_object_info(device->handle, &info);
1129 if (ACPI_FAILURE(status)) {
1130 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1131 return;
1132 }
1133
1134 if (info->valid & ACPI_VALID_HID)
1135 acpi_add_id(device, info->hardware_id.string);
1136 if (info->valid & ACPI_VALID_CID) {
1137 cid_list = &info->compatible_id_list;
1138 for (i = 0; i < cid_list->count; i++)
1139 acpi_add_id(device, cid_list->ids[i].string);
1140 }
1141 if (info->valid & ACPI_VALID_ADR) {
1142 device->pnp.bus_address = info->address;
1143 device->flags.bus_address = 1;
1144 }
1145
1146 kfree(info);
1147
1148 /*
1149 * Some devices don't reliably have _HIDs & _CIDs, so add
1150 * synthetic HIDs to make sure drivers can find them.
1151 */
1152 if (acpi_is_video_device(device))
1153 acpi_add_id(device, ACPI_VIDEO_HID);
1154 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1155 acpi_add_id(device, ACPI_BAY_HID);
1156 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1157 acpi_add_id(device, ACPI_DOCK_HID);
1158 else if (!acpi_ibm_smbus_match(device))
1159 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1160 else if (!acpi_device_hid(device) &&
1161 ACPI_IS_ROOT_DEVICE(device->parent)) {
1162 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1163 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1164 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1165 }
1166
1167 break;
1168 case ACPI_BUS_TYPE_POWER:
1169 acpi_add_id(device, ACPI_POWER_HID);
1170 break;
1171 case ACPI_BUS_TYPE_PROCESSOR:
1172 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1173 break;
1174 case ACPI_BUS_TYPE_THERMAL:
1175 acpi_add_id(device, ACPI_THERMAL_HID);
1176 break;
1177 case ACPI_BUS_TYPE_POWER_BUTTON:
1178 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1179 break;
1180 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1181 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1182 break;
1183 }
1184}
1185
1186static int acpi_device_set_context(struct acpi_device *device)
1187{
1188 acpi_status status;
1189
1190 /*
1191 * Context
1192 * -------
1193 * Attach this 'struct acpi_device' to the ACPI object. This makes
1194 * resolutions from handle->device very efficient. Fixed hardware
1195 * devices have no handles, so we skip them.
1196 */
1197 if (!device->handle)
1198 return 0;
1199
1200 status = acpi_attach_data(device->handle,
1201 acpi_bus_data_handler, device);
1202 if (ACPI_SUCCESS(status))
1203 return 0;
1204
1205 printk(KERN_ERR PREFIX "Error attaching device data\n");
1206 return -ENODEV;
1207}
1208
1209static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1210{
1211 if (!dev)
1212 return -EINVAL;
1213
1214 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1215 device_release_driver(&dev->dev);
1216
1217 if (!rmdevice)
1218 return 0;
1219
1220 /*
1221 * unbind _ADR-Based Devices when hot removal
1222 */
1223 if (dev->flags.bus_address) {
1224 if ((dev->parent) && (dev->parent->ops.unbind))
1225 dev->parent->ops.unbind(dev);
1226 }
1227 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1228
1229 return 0;
1230}
1231
1232static int acpi_add_single_object(struct acpi_device **child,
1233 acpi_handle handle, int type,
1234 unsigned long long sta,
1235 struct acpi_bus_ops *ops)
1236{
1237 int result;
1238 struct acpi_device *device;
1239 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1240
1241 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1242 if (!device) {
1243 printk(KERN_ERR PREFIX "Memory allocation error\n");
1244 return -ENOMEM;
1245 }
1246
1247 INIT_LIST_HEAD(&device->pnp.ids);
1248 device->device_type = type;
1249 device->handle = handle;
1250 device->parent = acpi_bus_get_parent(handle);
1251 device->bus_ops = *ops; /* workround for not call .start */
1252 STRUCT_TO_INT(device->status) = sta;
1253
1254 acpi_device_get_busid(device);
1255
1256 /*
1257 * Flags
1258 * -----
1259 * Note that we only look for object handles -- cannot evaluate objects
1260 * until we know the device is present and properly initialized.
1261 */
1262 result = acpi_bus_get_flags(device);
1263 if (result)
1264 goto end;
1265
1266 /*
1267 * Initialize Device
1268 * -----------------
1269 * TBD: Synch with Core's enumeration/initialization process.
1270 */
1271 acpi_device_set_id(device);
1272
1273 /*
1274 * Power Management
1275 * ----------------
1276 */
1277 if (device->flags.power_manageable) {
1278 result = acpi_bus_get_power_flags(device);
1279 if (result)
1280 goto end;
1281 }
1282
1283 /*
1284 * Wakeup device management
1285 *-----------------------
1286 */
1287 acpi_bus_get_wakeup_device_flags(device);
1288
1289 /*
1290 * Performance Management
1291 * ----------------------
1292 */
1293 if (device->flags.performance_manageable) {
1294 result = acpi_bus_get_perf_flags(device);
1295 if (result)
1296 goto end;
1297 }
1298
1299 if ((result = acpi_device_set_context(device)))
1300 goto end;
1301
1302 result = acpi_device_register(device);
1303
1304 /*
1305 * Bind _ADR-Based Devices when hot add
1306 */
1307 if (device->flags.bus_address) {
1308 if (device->parent && device->parent->ops.bind)
1309 device->parent->ops.bind(device);
1310 }
1311
1312end:
1313 if (!result) {
1314 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1315 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1316 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1317 (char *) buffer.pointer,
1318 device->parent ? dev_name(&device->parent->dev) :
1319 "(null)"));
1320 kfree(buffer.pointer);
1321 *child = device;
1322 } else
1323 acpi_device_release(&device->dev);
1324
1325 return result;
1326}
1327
1328#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1329 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1330
1331static void acpi_bus_add_power_resource(acpi_handle handle)
1332{
1333 struct acpi_bus_ops ops = {
1334 .acpi_op_add = 1,
1335 .acpi_op_start = 1,
1336 };
1337 struct acpi_device *device = NULL;
1338
1339 acpi_bus_get_device(handle, &device);
1340 if (!device)
1341 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1342 ACPI_STA_DEFAULT, &ops);
1343}
1344
1345static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1346 unsigned long long *sta)
1347{
1348 acpi_status status;
1349 acpi_object_type acpi_type;
1350
1351 status = acpi_get_type(handle, &acpi_type);
1352 if (ACPI_FAILURE(status))
1353 return -ENODEV;
1354
1355 switch (acpi_type) {
1356 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1357 case ACPI_TYPE_DEVICE:
1358 *type = ACPI_BUS_TYPE_DEVICE;
1359 status = acpi_bus_get_status_handle(handle, sta);
1360 if (ACPI_FAILURE(status))
1361 return -ENODEV;
1362 break;
1363 case ACPI_TYPE_PROCESSOR:
1364 *type = ACPI_BUS_TYPE_PROCESSOR;
1365 status = acpi_bus_get_status_handle(handle, sta);
1366 if (ACPI_FAILURE(status))
1367 return -ENODEV;
1368 break;
1369 case ACPI_TYPE_THERMAL:
1370 *type = ACPI_BUS_TYPE_THERMAL;
1371 *sta = ACPI_STA_DEFAULT;
1372 break;
1373 case ACPI_TYPE_POWER:
1374 *type = ACPI_BUS_TYPE_POWER;
1375 *sta = ACPI_STA_DEFAULT;
1376 break;
1377 default:
1378 return -ENODEV;
1379 }
1380
1381 return 0;
1382}
1383
1384static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1385 void *context, void **return_value)
1386{
1387 struct acpi_bus_ops *ops = context;
1388 int type;
1389 unsigned long long sta;
1390 struct acpi_device *device;
1391 acpi_status status;
1392 int result;
1393
1394 result = acpi_bus_type_and_status(handle, &type, &sta);
1395 if (result)
1396 return AE_OK;
1397
1398 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1399 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1400 struct acpi_device_wakeup wakeup;
1401 acpi_handle temp;
1402
1403 status = acpi_get_handle(handle, "_PRW", &temp);
1404 if (ACPI_SUCCESS(status))
1405 acpi_bus_extract_wakeup_device_power_package(handle,
1406 &wakeup);
1407 return AE_CTRL_DEPTH;
1408 }
1409
1410 /*
1411 * We may already have an acpi_device from a previous enumeration. If
1412 * so, we needn't add it again, but we may still have to start it.
1413 */
1414 device = NULL;
1415 acpi_bus_get_device(handle, &device);
1416 if (ops->acpi_op_add && !device)
1417 acpi_add_single_object(&device, handle, type, sta, ops);
1418
1419 if (!device)
1420 return AE_CTRL_DEPTH;
1421
1422 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1423 status = acpi_start_single_object(device);
1424 if (ACPI_FAILURE(status))
1425 return AE_CTRL_DEPTH;
1426 }
1427
1428 if (!*return_value)
1429 *return_value = device;
1430 return AE_OK;
1431}
1432
1433static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1434 struct acpi_device **child)
1435{
1436 acpi_status status;
1437 void *device = NULL;
1438
1439 status = acpi_bus_check_add(handle, 0, ops, &device);
1440 if (ACPI_SUCCESS(status))
1441 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1442 acpi_bus_check_add, NULL, ops, &device);
1443
1444 if (child)
1445 *child = device;
1446
1447 if (device)
1448 return 0;
1449 else
1450 return -ENODEV;
1451}
1452
1453/*
1454 * acpi_bus_add and acpi_bus_start
1455 *
1456 * scan a given ACPI tree and (probably recently hot-plugged)
1457 * create and add or starts found devices.
1458 *
1459 * If no devices were found -ENODEV is returned which does not
1460 * mean that this is a real error, there just have been no suitable
1461 * ACPI objects in the table trunk from which the kernel could create
1462 * a device and add/start an appropriate driver.
1463 */
1464
1465int
1466acpi_bus_add(struct acpi_device **child,
1467 struct acpi_device *parent, acpi_handle handle, int type)
1468{
1469 struct acpi_bus_ops ops;
1470
1471 memset(&ops, 0, sizeof(ops));
1472 ops.acpi_op_add = 1;
1473
1474 return acpi_bus_scan(handle, &ops, child);
1475}
1476EXPORT_SYMBOL(acpi_bus_add);
1477
1478int acpi_bus_start(struct acpi_device *device)
1479{
1480 struct acpi_bus_ops ops;
1481 int result;
1482
1483 if (!device)
1484 return -EINVAL;
1485
1486 memset(&ops, 0, sizeof(ops));
1487 ops.acpi_op_start = 1;
1488
1489 result = acpi_bus_scan(device->handle, &ops, NULL);
1490
1491 acpi_update_all_gpes();
1492
1493 return result;
1494}
1495EXPORT_SYMBOL(acpi_bus_start);
1496
1497int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1498{
1499 acpi_status status;
1500 struct acpi_device *parent, *child;
1501 acpi_handle phandle, chandle;
1502 acpi_object_type type;
1503 u32 level = 1;
1504 int err = 0;
1505
1506 parent = start;
1507 phandle = start->handle;
1508 child = chandle = NULL;
1509
1510 while ((level > 0) && parent && (!err)) {
1511 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1512 chandle, &chandle);
1513
1514 /*
1515 * If this scope is exhausted then move our way back up.
1516 */
1517 if (ACPI_FAILURE(status)) {
1518 level--;
1519 chandle = phandle;
1520 acpi_get_parent(phandle, &phandle);
1521 child = parent;
1522 parent = parent->parent;
1523
1524 if (level == 0)
1525 err = acpi_bus_remove(child, rmdevice);
1526 else
1527 err = acpi_bus_remove(child, 1);
1528
1529 continue;
1530 }
1531
1532 status = acpi_get_type(chandle, &type);
1533 if (ACPI_FAILURE(status)) {
1534 continue;
1535 }
1536 /*
1537 * If there is a device corresponding to chandle then
1538 * parse it (depth-first).
1539 */
1540 if (acpi_bus_get_device(chandle, &child) == 0) {
1541 level++;
1542 phandle = chandle;
1543 chandle = NULL;
1544 parent = child;
1545 }
1546 continue;
1547 }
1548 return err;
1549}
1550EXPORT_SYMBOL_GPL(acpi_bus_trim);
1551
1552static int acpi_bus_scan_fixed(void)
1553{
1554 int result = 0;
1555 struct acpi_device *device = NULL;
1556 struct acpi_bus_ops ops;
1557
1558 memset(&ops, 0, sizeof(ops));
1559 ops.acpi_op_add = 1;
1560 ops.acpi_op_start = 1;
1561
1562 /*
1563 * Enumerate all fixed-feature devices.
1564 */
1565 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1566 result = acpi_add_single_object(&device, NULL,
1567 ACPI_BUS_TYPE_POWER_BUTTON,
1568 ACPI_STA_DEFAULT,
1569 &ops);
1570 device_init_wakeup(&device->dev, true);
1571 }
1572
1573 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1574 result = acpi_add_single_object(&device, NULL,
1575 ACPI_BUS_TYPE_SLEEP_BUTTON,
1576 ACPI_STA_DEFAULT,
1577 &ops);
1578 }
1579
1580 return result;
1581}
1582
1583int __init acpi_scan_init(void)
1584{
1585 int result;
1586 struct acpi_bus_ops ops;
1587
1588 memset(&ops, 0, sizeof(ops));
1589 ops.acpi_op_add = 1;
1590 ops.acpi_op_start = 1;
1591
1592 result = bus_register(&acpi_bus_type);
1593 if (result) {
1594 /* We don't want to quit even if we failed to add suspend/resume */
1595 printk(KERN_ERR PREFIX "Could not register bus type\n");
1596 }
1597
1598 acpi_power_init();
1599
1600 /*
1601 * Enumerate devices in the ACPI namespace.
1602 */
1603 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1604
1605 if (!result)
1606 result = acpi_bus_scan_fixed();
1607
1608 if (result)
1609 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1610 else
1611 acpi_update_all_gpes();
1612
1613 return result;
1614}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * scan.c - support for transforming the ACPI namespace into individual objects
4 */
5
6#define pr_fmt(fmt) "ACPI: " fmt
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/kernel.h>
12#include <linux/acpi.h>
13#include <linux/acpi_iort.h>
14#include <linux/acpi_viot.h>
15#include <linux/iommu.h>
16#include <linux/signal.h>
17#include <linux/kthread.h>
18#include <linux/dmi.h>
19#include <linux/dma-map-ops.h>
20#include <linux/platform_data/x86/apple.h>
21#include <linux/pgtable.h>
22#include <linux/crc32.h>
23#include <linux/dma-direct.h>
24
25#include "internal.h"
26
27extern struct acpi_device *acpi_root;
28
29#define ACPI_BUS_CLASS "system_bus"
30#define ACPI_BUS_HID "LNXSYBUS"
31#define ACPI_BUS_DEVICE_NAME "System Bus"
32
33#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))
34
35static const char *dummy_hid = "device";
36
37static LIST_HEAD(acpi_dep_list);
38static DEFINE_MUTEX(acpi_dep_list_lock);
39LIST_HEAD(acpi_bus_id_list);
40static DEFINE_MUTEX(acpi_scan_lock);
41static LIST_HEAD(acpi_scan_handlers_list);
42DEFINE_MUTEX(acpi_device_lock);
43LIST_HEAD(acpi_wakeup_device_list);
44static DEFINE_MUTEX(acpi_hp_context_lock);
45
46/*
47 * The UART device described by the SPCR table is the only object which needs
48 * special-casing. Everything else is covered by ACPI namespace paths in STAO
49 * table.
50 */
51static u64 spcr_uart_addr;
52
53void acpi_scan_lock_acquire(void)
54{
55 mutex_lock(&acpi_scan_lock);
56}
57EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
58
59void acpi_scan_lock_release(void)
60{
61 mutex_unlock(&acpi_scan_lock);
62}
63EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
64
65void acpi_lock_hp_context(void)
66{
67 mutex_lock(&acpi_hp_context_lock);
68}
69
70void acpi_unlock_hp_context(void)
71{
72 mutex_unlock(&acpi_hp_context_lock);
73}
74
75void acpi_initialize_hp_context(struct acpi_device *adev,
76 struct acpi_hotplug_context *hp,
77 int (*notify)(struct acpi_device *, u32),
78 void (*uevent)(struct acpi_device *, u32))
79{
80 acpi_lock_hp_context();
81 hp->notify = notify;
82 hp->uevent = uevent;
83 acpi_set_hp_context(adev, hp);
84 acpi_unlock_hp_context();
85}
86EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
87
88int acpi_scan_add_handler(struct acpi_scan_handler *handler)
89{
90 if (!handler)
91 return -EINVAL;
92
93 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
94 return 0;
95}
96
97int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
98 const char *hotplug_profile_name)
99{
100 int error;
101
102 error = acpi_scan_add_handler(handler);
103 if (error)
104 return error;
105
106 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
107 return 0;
108}
109
110bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
111{
112 struct acpi_device_physical_node *pn;
113 bool offline = true;
114 char *envp[] = { "EVENT=offline", NULL };
115
116 /*
117 * acpi_container_offline() calls this for all of the container's
118 * children under the container's physical_node_lock lock.
119 */
120 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
121
122 list_for_each_entry(pn, &adev->physical_node_list, node)
123 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
124 if (uevent)
125 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
126
127 offline = false;
128 break;
129 }
130
131 mutex_unlock(&adev->physical_node_lock);
132 return offline;
133}
134
135static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
136 void **ret_p)
137{
138 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
139 struct acpi_device_physical_node *pn;
140 bool second_pass = (bool)data;
141 acpi_status status = AE_OK;
142
143 if (!device)
144 return AE_OK;
145
146 if (device->handler && !device->handler->hotplug.enabled) {
147 *ret_p = &device->dev;
148 return AE_SUPPORT;
149 }
150
151 mutex_lock(&device->physical_node_lock);
152
153 list_for_each_entry(pn, &device->physical_node_list, node) {
154 int ret;
155
156 if (second_pass) {
157 /* Skip devices offlined by the first pass. */
158 if (pn->put_online)
159 continue;
160 } else {
161 pn->put_online = false;
162 }
163 ret = device_offline(pn->dev);
164 if (ret >= 0) {
165 pn->put_online = !ret;
166 } else {
167 *ret_p = pn->dev;
168 if (second_pass) {
169 status = AE_ERROR;
170 break;
171 }
172 }
173 }
174
175 mutex_unlock(&device->physical_node_lock);
176
177 return status;
178}
179
180static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
181 void **ret_p)
182{
183 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
184 struct acpi_device_physical_node *pn;
185
186 if (!device)
187 return AE_OK;
188
189 mutex_lock(&device->physical_node_lock);
190
191 list_for_each_entry(pn, &device->physical_node_list, node)
192 if (pn->put_online) {
193 device_online(pn->dev);
194 pn->put_online = false;
195 }
196
197 mutex_unlock(&device->physical_node_lock);
198
199 return AE_OK;
200}
201
202static int acpi_scan_try_to_offline(struct acpi_device *device)
203{
204 acpi_handle handle = device->handle;
205 struct device *errdev = NULL;
206 acpi_status status;
207
208 /*
209 * Carry out two passes here and ignore errors in the first pass,
210 * because if the devices in question are memory blocks and
211 * CONFIG_MEMCG is set, one of the blocks may hold data structures
212 * that the other blocks depend on, but it is not known in advance which
213 * block holds them.
214 *
215 * If the first pass is successful, the second one isn't needed, though.
216 */
217 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
218 NULL, acpi_bus_offline, (void *)false,
219 (void **)&errdev);
220 if (status == AE_SUPPORT) {
221 dev_warn(errdev, "Offline disabled.\n");
222 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 acpi_bus_online, NULL, NULL, NULL);
224 return -EPERM;
225 }
226 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
227 if (errdev) {
228 errdev = NULL;
229 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
230 NULL, acpi_bus_offline, (void *)true,
231 (void **)&errdev);
232 if (!errdev)
233 acpi_bus_offline(handle, 0, (void *)true,
234 (void **)&errdev);
235
236 if (errdev) {
237 dev_warn(errdev, "Offline failed.\n");
238 acpi_bus_online(handle, 0, NULL, NULL);
239 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
240 ACPI_UINT32_MAX, acpi_bus_online,
241 NULL, NULL, NULL);
242 return -EBUSY;
243 }
244 }
245 return 0;
246}
247
248static int acpi_scan_hot_remove(struct acpi_device *device)
249{
250 acpi_handle handle = device->handle;
251 unsigned long long sta;
252 acpi_status status;
253
254 if (device->handler && device->handler->hotplug.demand_offline) {
255 if (!acpi_scan_is_offline(device, true))
256 return -EBUSY;
257 } else {
258 int error = acpi_scan_try_to_offline(device);
259 if (error)
260 return error;
261 }
262
263 acpi_handle_debug(handle, "Ejecting\n");
264
265 acpi_bus_trim(device);
266
267 acpi_evaluate_lck(handle, 0);
268 /*
269 * TBD: _EJD support.
270 */
271 status = acpi_evaluate_ej0(handle);
272 if (status == AE_NOT_FOUND)
273 return -ENODEV;
274 else if (ACPI_FAILURE(status))
275 return -EIO;
276
277 /*
278 * Verify if eject was indeed successful. If not, log an error
279 * message. No need to call _OST since _EJ0 call was made OK.
280 */
281 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
282 if (ACPI_FAILURE(status)) {
283 acpi_handle_warn(handle,
284 "Status check after eject failed (0x%x)\n", status);
285 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
286 acpi_handle_warn(handle,
287 "Eject incomplete - status 0x%llx\n", sta);
288 }
289
290 return 0;
291}
292
293static int acpi_scan_device_not_present(struct acpi_device *adev)
294{
295 if (!acpi_device_enumerated(adev)) {
296 dev_warn(&adev->dev, "Still not present\n");
297 return -EALREADY;
298 }
299 acpi_bus_trim(adev);
300 return 0;
301}
302
303static int acpi_scan_device_check(struct acpi_device *adev)
304{
305 int error;
306
307 acpi_bus_get_status(adev);
308 if (adev->status.present || adev->status.functional) {
309 /*
310 * This function is only called for device objects for which
311 * matching scan handlers exist. The only situation in which
312 * the scan handler is not attached to this device object yet
313 * is when the device has just appeared (either it wasn't
314 * present at all before or it was removed and then added
315 * again).
316 */
317 if (adev->handler) {
318 dev_warn(&adev->dev, "Already enumerated\n");
319 return -EALREADY;
320 }
321 error = acpi_bus_scan(adev->handle);
322 if (error) {
323 dev_warn(&adev->dev, "Namespace scan failure\n");
324 return error;
325 }
326 if (!adev->handler) {
327 dev_warn(&adev->dev, "Enumeration failure\n");
328 error = -ENODEV;
329 }
330 } else {
331 error = acpi_scan_device_not_present(adev);
332 }
333 return error;
334}
335
336static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
337{
338 struct acpi_scan_handler *handler = adev->handler;
339 int error;
340
341 acpi_bus_get_status(adev);
342 if (!(adev->status.present || adev->status.functional)) {
343 acpi_scan_device_not_present(adev);
344 return 0;
345 }
346 if (handler && handler->hotplug.scan_dependent)
347 return handler->hotplug.scan_dependent(adev);
348
349 error = acpi_bus_scan(adev->handle);
350 if (error) {
351 dev_warn(&adev->dev, "Namespace scan failure\n");
352 return error;
353 }
354 return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
355}
356
357static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
358{
359 switch (type) {
360 case ACPI_NOTIFY_BUS_CHECK:
361 return acpi_scan_bus_check(adev, NULL);
362 case ACPI_NOTIFY_DEVICE_CHECK:
363 return acpi_scan_device_check(adev);
364 case ACPI_NOTIFY_EJECT_REQUEST:
365 case ACPI_OST_EC_OSPM_EJECT:
366 if (adev->handler && !adev->handler->hotplug.enabled) {
367 dev_info(&adev->dev, "Eject disabled\n");
368 return -EPERM;
369 }
370 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
371 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
372 return acpi_scan_hot_remove(adev);
373 }
374 return -EINVAL;
375}
376
377void acpi_device_hotplug(struct acpi_device *adev, u32 src)
378{
379 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
380 int error = -ENODEV;
381
382 lock_device_hotplug();
383 mutex_lock(&acpi_scan_lock);
384
385 /*
386 * The device object's ACPI handle cannot become invalid as long as we
387 * are holding acpi_scan_lock, but it might have become invalid before
388 * that lock was acquired.
389 */
390 if (adev->handle == INVALID_ACPI_HANDLE)
391 goto err_out;
392
393 if (adev->flags.is_dock_station) {
394 error = dock_notify(adev, src);
395 } else if (adev->flags.hotplug_notify) {
396 error = acpi_generic_hotplug_event(adev, src);
397 } else {
398 int (*notify)(struct acpi_device *, u32);
399
400 acpi_lock_hp_context();
401 notify = adev->hp ? adev->hp->notify : NULL;
402 acpi_unlock_hp_context();
403 /*
404 * There may be additional notify handlers for device objects
405 * without the .event() callback, so ignore them here.
406 */
407 if (notify)
408 error = notify(adev, src);
409 else
410 goto out;
411 }
412 switch (error) {
413 case 0:
414 ost_code = ACPI_OST_SC_SUCCESS;
415 break;
416 case -EPERM:
417 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
418 break;
419 case -EBUSY:
420 ost_code = ACPI_OST_SC_DEVICE_BUSY;
421 break;
422 default:
423 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
424 break;
425 }
426
427 err_out:
428 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
429
430 out:
431 acpi_put_acpi_dev(adev);
432 mutex_unlock(&acpi_scan_lock);
433 unlock_device_hotplug();
434}
435
436static void acpi_free_power_resources_lists(struct acpi_device *device)
437{
438 int i;
439
440 if (device->wakeup.flags.valid)
441 acpi_power_resources_list_free(&device->wakeup.resources);
442
443 if (!device->power.flags.power_resources)
444 return;
445
446 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
447 struct acpi_device_power_state *ps = &device->power.states[i];
448 acpi_power_resources_list_free(&ps->resources);
449 }
450}
451
452static void acpi_device_release(struct device *dev)
453{
454 struct acpi_device *acpi_dev = to_acpi_device(dev);
455
456 acpi_free_properties(acpi_dev);
457 acpi_free_pnp_ids(&acpi_dev->pnp);
458 acpi_free_power_resources_lists(acpi_dev);
459 kfree(acpi_dev);
460}
461
462static void acpi_device_del(struct acpi_device *device)
463{
464 struct acpi_device_bus_id *acpi_device_bus_id;
465
466 mutex_lock(&acpi_device_lock);
467
468 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
469 if (!strcmp(acpi_device_bus_id->bus_id,
470 acpi_device_hid(device))) {
471 ida_free(&acpi_device_bus_id->instance_ida,
472 device->pnp.instance_no);
473 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
474 list_del(&acpi_device_bus_id->node);
475 kfree_const(acpi_device_bus_id->bus_id);
476 kfree(acpi_device_bus_id);
477 }
478 break;
479 }
480
481 list_del(&device->wakeup_list);
482
483 mutex_unlock(&acpi_device_lock);
484
485 acpi_power_add_remove_device(device, false);
486 acpi_device_remove_files(device);
487 if (device->remove)
488 device->remove(device);
489
490 device_del(&device->dev);
491}
492
493static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
494
495static LIST_HEAD(acpi_device_del_list);
496static DEFINE_MUTEX(acpi_device_del_lock);
497
498static void acpi_device_del_work_fn(struct work_struct *work_not_used)
499{
500 for (;;) {
501 struct acpi_device *adev;
502
503 mutex_lock(&acpi_device_del_lock);
504
505 if (list_empty(&acpi_device_del_list)) {
506 mutex_unlock(&acpi_device_del_lock);
507 break;
508 }
509 adev = list_first_entry(&acpi_device_del_list,
510 struct acpi_device, del_list);
511 list_del(&adev->del_list);
512
513 mutex_unlock(&acpi_device_del_lock);
514
515 blocking_notifier_call_chain(&acpi_reconfig_chain,
516 ACPI_RECONFIG_DEVICE_REMOVE, adev);
517
518 acpi_device_del(adev);
519 /*
520 * Drop references to all power resources that might have been
521 * used by the device.
522 */
523 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
524 acpi_dev_put(adev);
525 }
526}
527
528/**
529 * acpi_scan_drop_device - Drop an ACPI device object.
530 * @handle: Handle of an ACPI namespace node, not used.
531 * @context: Address of the ACPI device object to drop.
532 *
533 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
534 * namespace node the device object pointed to by @context is attached to.
535 *
536 * The unregistration is carried out asynchronously to avoid running
537 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
538 * ensure the correct ordering (the device objects must be unregistered in the
539 * same order in which the corresponding namespace nodes are deleted).
540 */
541static void acpi_scan_drop_device(acpi_handle handle, void *context)
542{
543 static DECLARE_WORK(work, acpi_device_del_work_fn);
544 struct acpi_device *adev = context;
545
546 mutex_lock(&acpi_device_del_lock);
547
548 /*
549 * Use the ACPI hotplug workqueue which is ordered, so this work item
550 * won't run after any hotplug work items submitted subsequently. That
551 * prevents attempts to register device objects identical to those being
552 * deleted from happening concurrently (such attempts result from
553 * hotplug events handled via the ACPI hotplug workqueue). It also will
554 * run after all of the work items submitted previously, which helps
555 * those work items to ensure that they are not accessing stale device
556 * objects.
557 */
558 if (list_empty(&acpi_device_del_list))
559 acpi_queue_hotplug_work(&work);
560
561 list_add_tail(&adev->del_list, &acpi_device_del_list);
562 /* Make acpi_ns_validate_handle() return NULL for this handle. */
563 adev->handle = INVALID_ACPI_HANDLE;
564
565 mutex_unlock(&acpi_device_del_lock);
566}
567
568static struct acpi_device *handle_to_device(acpi_handle handle,
569 void (*callback)(void *))
570{
571 struct acpi_device *adev = NULL;
572 acpi_status status;
573
574 status = acpi_get_data_full(handle, acpi_scan_drop_device,
575 (void **)&adev, callback);
576 if (ACPI_FAILURE(status) || !adev) {
577 acpi_handle_debug(handle, "No context!\n");
578 return NULL;
579 }
580 return adev;
581}
582
583/**
584 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
585 * @handle: ACPI handle associated with the requested ACPI device object.
586 *
587 * Return a pointer to the ACPI device object associated with @handle, if
588 * present, or NULL otherwise.
589 */
590struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
591{
592 return handle_to_device(handle, NULL);
593}
594EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
595
596static void get_acpi_device(void *dev)
597{
598 acpi_dev_get(dev);
599}
600
601/**
602 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
603 * @handle: ACPI handle associated with the requested ACPI device object.
604 *
605 * Return a pointer to the ACPI device object associated with @handle and bump
606 * up that object's reference counter (under the ACPI Namespace lock), if
607 * present, or return NULL otherwise.
608 *
609 * The ACPI device object reference acquired by this function needs to be
610 * dropped via acpi_dev_put().
611 */
612struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
613{
614 return handle_to_device(handle, get_acpi_device);
615}
616EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
617
618static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
619{
620 struct acpi_device_bus_id *acpi_device_bus_id;
621
622 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
623 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
624 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
625 return acpi_device_bus_id;
626 }
627 return NULL;
628}
629
630static int acpi_device_set_name(struct acpi_device *device,
631 struct acpi_device_bus_id *acpi_device_bus_id)
632{
633 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
634 int result;
635
636 result = ida_alloc(instance_ida, GFP_KERNEL);
637 if (result < 0)
638 return result;
639
640 device->pnp.instance_no = result;
641 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
642 return 0;
643}
644
645int acpi_tie_acpi_dev(struct acpi_device *adev)
646{
647 acpi_handle handle = adev->handle;
648 acpi_status status;
649
650 if (!handle)
651 return 0;
652
653 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
654 if (ACPI_FAILURE(status)) {
655 acpi_handle_err(handle, "Unable to attach device data\n");
656 return -ENODEV;
657 }
658
659 return 0;
660}
661
662static void acpi_store_pld_crc(struct acpi_device *adev)
663{
664 struct acpi_pld_info *pld;
665 acpi_status status;
666
667 status = acpi_get_physical_device_location(adev->handle, &pld);
668 if (ACPI_FAILURE(status))
669 return;
670
671 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
672 ACPI_FREE(pld);
673}
674
675int acpi_device_add(struct acpi_device *device)
676{
677 struct acpi_device_bus_id *acpi_device_bus_id;
678 int result;
679
680 /*
681 * Linkage
682 * -------
683 * Link this device to its parent and siblings.
684 */
685 INIT_LIST_HEAD(&device->wakeup_list);
686 INIT_LIST_HEAD(&device->physical_node_list);
687 INIT_LIST_HEAD(&device->del_list);
688 mutex_init(&device->physical_node_lock);
689
690 mutex_lock(&acpi_device_lock);
691
692 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
693 if (acpi_device_bus_id) {
694 result = acpi_device_set_name(device, acpi_device_bus_id);
695 if (result)
696 goto err_unlock;
697 } else {
698 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
699 GFP_KERNEL);
700 if (!acpi_device_bus_id) {
701 result = -ENOMEM;
702 goto err_unlock;
703 }
704 acpi_device_bus_id->bus_id =
705 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
706 if (!acpi_device_bus_id->bus_id) {
707 kfree(acpi_device_bus_id);
708 result = -ENOMEM;
709 goto err_unlock;
710 }
711
712 ida_init(&acpi_device_bus_id->instance_ida);
713
714 result = acpi_device_set_name(device, acpi_device_bus_id);
715 if (result) {
716 kfree_const(acpi_device_bus_id->bus_id);
717 kfree(acpi_device_bus_id);
718 goto err_unlock;
719 }
720
721 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
722 }
723
724 if (device->wakeup.flags.valid)
725 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
726
727 acpi_store_pld_crc(device);
728
729 mutex_unlock(&acpi_device_lock);
730
731 result = device_add(&device->dev);
732 if (result) {
733 dev_err(&device->dev, "Error registering device\n");
734 goto err;
735 }
736
737 result = acpi_device_setup_files(device);
738 if (result)
739 pr_err("Error creating sysfs interface for device %s\n",
740 dev_name(&device->dev));
741
742 return 0;
743
744err:
745 mutex_lock(&acpi_device_lock);
746
747 list_del(&device->wakeup_list);
748
749err_unlock:
750 mutex_unlock(&acpi_device_lock);
751
752 acpi_detach_data(device->handle, acpi_scan_drop_device);
753
754 return result;
755}
756
757/* --------------------------------------------------------------------------
758 Device Enumeration
759 -------------------------------------------------------------------------- */
760static bool acpi_info_matches_ids(struct acpi_device_info *info,
761 const char * const ids[])
762{
763 struct acpi_pnp_device_id_list *cid_list = NULL;
764 int i, index;
765
766 if (!(info->valid & ACPI_VALID_HID))
767 return false;
768
769 index = match_string(ids, -1, info->hardware_id.string);
770 if (index >= 0)
771 return true;
772
773 if (info->valid & ACPI_VALID_CID)
774 cid_list = &info->compatible_id_list;
775
776 if (!cid_list)
777 return false;
778
779 for (i = 0; i < cid_list->count; i++) {
780 index = match_string(ids, -1, cid_list->ids[i].string);
781 if (index >= 0)
782 return true;
783 }
784
785 return false;
786}
787
788/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
789static const char * const acpi_ignore_dep_ids[] = {
790 "PNP0D80", /* Windows-compatible System Power Management Controller */
791 "INT33BD", /* Intel Baytrail Mailbox Device */
792 "LATT2021", /* Lattice FW Update Client Driver */
793 NULL
794};
795
796/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
797static const char * const acpi_honor_dep_ids[] = {
798 "INT3472", /* Camera sensor PMIC / clk and regulator info */
799 NULL
800};
801
802static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
803{
804 struct acpi_device *adev;
805
806 /*
807 * Fixed hardware devices do not appear in the namespace and do not
808 * have handles, but we fabricate acpi_devices for them, so we have
809 * to deal with them specially.
810 */
811 if (!handle)
812 return acpi_root;
813
814 do {
815 acpi_status status;
816
817 status = acpi_get_parent(handle, &handle);
818 if (ACPI_FAILURE(status)) {
819 if (status != AE_NULL_ENTRY)
820 return acpi_root;
821
822 return NULL;
823 }
824 adev = acpi_fetch_acpi_dev(handle);
825 } while (!adev);
826 return adev;
827}
828
829acpi_status
830acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
831{
832 acpi_status status;
833 acpi_handle tmp;
834 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
835 union acpi_object *obj;
836
837 status = acpi_get_handle(handle, "_EJD", &tmp);
838 if (ACPI_FAILURE(status))
839 return status;
840
841 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
842 if (ACPI_SUCCESS(status)) {
843 obj = buffer.pointer;
844 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
845 ejd);
846 kfree(buffer.pointer);
847 }
848 return status;
849}
850EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
851
852static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
853{
854 acpi_handle handle = dev->handle;
855 struct acpi_device_wakeup *wakeup = &dev->wakeup;
856 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
857 union acpi_object *package = NULL;
858 union acpi_object *element = NULL;
859 acpi_status status;
860 int err = -ENODATA;
861
862 INIT_LIST_HEAD(&wakeup->resources);
863
864 /* _PRW */
865 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
866 if (ACPI_FAILURE(status)) {
867 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
868 acpi_format_exception(status));
869 return err;
870 }
871
872 package = (union acpi_object *)buffer.pointer;
873
874 if (!package || package->package.count < 2)
875 goto out;
876
877 element = &(package->package.elements[0]);
878 if (!element)
879 goto out;
880
881 if (element->type == ACPI_TYPE_PACKAGE) {
882 if ((element->package.count < 2) ||
883 (element->package.elements[0].type !=
884 ACPI_TYPE_LOCAL_REFERENCE)
885 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
886 goto out;
887
888 wakeup->gpe_device =
889 element->package.elements[0].reference.handle;
890 wakeup->gpe_number =
891 (u32) element->package.elements[1].integer.value;
892 } else if (element->type == ACPI_TYPE_INTEGER) {
893 wakeup->gpe_device = NULL;
894 wakeup->gpe_number = element->integer.value;
895 } else {
896 goto out;
897 }
898
899 element = &(package->package.elements[1]);
900 if (element->type != ACPI_TYPE_INTEGER)
901 goto out;
902
903 wakeup->sleep_state = element->integer.value;
904
905 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
906 if (err)
907 goto out;
908
909 if (!list_empty(&wakeup->resources)) {
910 int sleep_state;
911
912 err = acpi_power_wakeup_list_init(&wakeup->resources,
913 &sleep_state);
914 if (err) {
915 acpi_handle_warn(handle, "Retrieving current states "
916 "of wakeup power resources failed\n");
917 acpi_power_resources_list_free(&wakeup->resources);
918 goto out;
919 }
920 if (sleep_state < wakeup->sleep_state) {
921 acpi_handle_warn(handle, "Overriding _PRW sleep state "
922 "(S%d) by S%d from power resources\n",
923 (int)wakeup->sleep_state, sleep_state);
924 wakeup->sleep_state = sleep_state;
925 }
926 }
927
928 out:
929 kfree(buffer.pointer);
930 return err;
931}
932
933static bool acpi_wakeup_gpe_init(struct acpi_device *device)
934{
935 static const struct acpi_device_id button_device_ids[] = {
936 {"PNP0C0C", 0}, /* Power button */
937 {"PNP0C0D", 0}, /* Lid */
938 {"PNP0C0E", 0}, /* Sleep button */
939 {"", 0},
940 };
941 struct acpi_device_wakeup *wakeup = &device->wakeup;
942 acpi_status status;
943
944 wakeup->flags.notifier_present = 0;
945
946 /* Power button, Lid switch always enable wakeup */
947 if (!acpi_match_device_ids(device, button_device_ids)) {
948 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
949 /* Do not use Lid/sleep button for S5 wakeup */
950 if (wakeup->sleep_state == ACPI_STATE_S5)
951 wakeup->sleep_state = ACPI_STATE_S4;
952 }
953 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
954 device_set_wakeup_capable(&device->dev, true);
955 return true;
956 }
957
958 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
959 wakeup->gpe_number);
960 return ACPI_SUCCESS(status);
961}
962
963static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
964{
965 int err;
966
967 /* Presence of _PRW indicates wake capable */
968 if (!acpi_has_method(device->handle, "_PRW"))
969 return;
970
971 err = acpi_bus_extract_wakeup_device_power_package(device);
972 if (err) {
973 dev_err(&device->dev, "Unable to extract wakeup power resources");
974 return;
975 }
976
977 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
978 device->wakeup.prepare_count = 0;
979 /*
980 * Call _PSW/_DSW object to disable its ability to wake the sleeping
981 * system for the ACPI device with the _PRW object.
982 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
983 * So it is necessary to call _DSW object first. Only when it is not
984 * present will the _PSW object used.
985 */
986 err = acpi_device_sleep_wake(device, 0, 0, 0);
987 if (err)
988 pr_debug("error in _DSW or _PSW evaluation\n");
989}
990
991static void acpi_bus_init_power_state(struct acpi_device *device, int state)
992{
993 struct acpi_device_power_state *ps = &device->power.states[state];
994 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
995 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
996 acpi_status status;
997
998 INIT_LIST_HEAD(&ps->resources);
999
1000 /* Evaluate "_PRx" to get referenced power resources */
1001 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1002 if (ACPI_SUCCESS(status)) {
1003 union acpi_object *package = buffer.pointer;
1004
1005 if (buffer.length && package
1006 && package->type == ACPI_TYPE_PACKAGE
1007 && package->package.count)
1008 acpi_extract_power_resources(package, 0, &ps->resources);
1009
1010 ACPI_FREE(buffer.pointer);
1011 }
1012
1013 /* Evaluate "_PSx" to see if we can do explicit sets */
1014 pathname[2] = 'S';
1015 if (acpi_has_method(device->handle, pathname))
1016 ps->flags.explicit_set = 1;
1017
1018 /* State is valid if there are means to put the device into it. */
1019 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1020 ps->flags.valid = 1;
1021
1022 ps->power = -1; /* Unknown - driver assigned */
1023 ps->latency = -1; /* Unknown - driver assigned */
1024}
1025
1026static void acpi_bus_get_power_flags(struct acpi_device *device)
1027{
1028 unsigned long long dsc = ACPI_STATE_D0;
1029 u32 i;
1030
1031 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1032 if (!acpi_has_method(device->handle, "_PS0") &&
1033 !acpi_has_method(device->handle, "_PR0"))
1034 return;
1035
1036 device->flags.power_manageable = 1;
1037
1038 /*
1039 * Power Management Flags
1040 */
1041 if (acpi_has_method(device->handle, "_PSC"))
1042 device->power.flags.explicit_get = 1;
1043
1044 if (acpi_has_method(device->handle, "_IRC"))
1045 device->power.flags.inrush_current = 1;
1046
1047 if (acpi_has_method(device->handle, "_DSW"))
1048 device->power.flags.dsw_present = 1;
1049
1050 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1051 device->power.state_for_enumeration = dsc;
1052
1053 /*
1054 * Enumerate supported power management states
1055 */
1056 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1057 acpi_bus_init_power_state(device, i);
1058
1059 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1060
1061 /* Set the defaults for D0 and D3hot (always supported). */
1062 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1063 device->power.states[ACPI_STATE_D0].power = 100;
1064 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1065
1066 /*
1067 * Use power resources only if the D0 list of them is populated, because
1068 * some platforms may provide _PR3 only to indicate D3cold support and
1069 * in those cases the power resources list returned by it may be bogus.
1070 */
1071 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1072 device->power.flags.power_resources = 1;
1073 /*
1074 * D3cold is supported if the D3hot list of power resources is
1075 * not empty.
1076 */
1077 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1078 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1079 }
1080
1081 if (acpi_bus_init_power(device))
1082 device->flags.power_manageable = 0;
1083}
1084
1085static void acpi_bus_get_flags(struct acpi_device *device)
1086{
1087 /* Presence of _STA indicates 'dynamic_status' */
1088 if (acpi_has_method(device->handle, "_STA"))
1089 device->flags.dynamic_status = 1;
1090
1091 /* Presence of _RMV indicates 'removable' */
1092 if (acpi_has_method(device->handle, "_RMV"))
1093 device->flags.removable = 1;
1094
1095 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1096 if (acpi_has_method(device->handle, "_EJD") ||
1097 acpi_has_method(device->handle, "_EJ0"))
1098 device->flags.ejectable = 1;
1099}
1100
1101static void acpi_device_get_busid(struct acpi_device *device)
1102{
1103 char bus_id[5] = { '?', 0 };
1104 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1105 int i = 0;
1106
1107 /*
1108 * Bus ID
1109 * ------
1110 * The device's Bus ID is simply the object name.
1111 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1112 */
1113 if (!acpi_dev_parent(device)) {
1114 strcpy(device->pnp.bus_id, "ACPI");
1115 return;
1116 }
1117
1118 switch (device->device_type) {
1119 case ACPI_BUS_TYPE_POWER_BUTTON:
1120 strcpy(device->pnp.bus_id, "PWRF");
1121 break;
1122 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1123 strcpy(device->pnp.bus_id, "SLPF");
1124 break;
1125 case ACPI_BUS_TYPE_ECDT_EC:
1126 strcpy(device->pnp.bus_id, "ECDT");
1127 break;
1128 default:
1129 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1130 /* Clean up trailing underscores (if any) */
1131 for (i = 3; i > 1; i--) {
1132 if (bus_id[i] == '_')
1133 bus_id[i] = '\0';
1134 else
1135 break;
1136 }
1137 strcpy(device->pnp.bus_id, bus_id);
1138 break;
1139 }
1140}
1141
1142/*
1143 * acpi_ata_match - see if an acpi object is an ATA device
1144 *
1145 * If an acpi object has one of the ACPI ATA methods defined,
1146 * then we can safely call it an ATA device.
1147 */
1148bool acpi_ata_match(acpi_handle handle)
1149{
1150 return acpi_has_method(handle, "_GTF") ||
1151 acpi_has_method(handle, "_GTM") ||
1152 acpi_has_method(handle, "_STM") ||
1153 acpi_has_method(handle, "_SDD");
1154}
1155
1156/*
1157 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1158 *
1159 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1160 * then we can safely call it an ejectable drive bay
1161 */
1162bool acpi_bay_match(acpi_handle handle)
1163{
1164 acpi_handle phandle;
1165
1166 if (!acpi_has_method(handle, "_EJ0"))
1167 return false;
1168 if (acpi_ata_match(handle))
1169 return true;
1170 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1171 return false;
1172
1173 return acpi_ata_match(phandle);
1174}
1175
1176bool acpi_device_is_battery(struct acpi_device *adev)
1177{
1178 struct acpi_hardware_id *hwid;
1179
1180 list_for_each_entry(hwid, &adev->pnp.ids, list)
1181 if (!strcmp("PNP0C0A", hwid->id))
1182 return true;
1183
1184 return false;
1185}
1186
1187static bool is_ejectable_bay(struct acpi_device *adev)
1188{
1189 acpi_handle handle = adev->handle;
1190
1191 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1192 return true;
1193
1194 return acpi_bay_match(handle);
1195}
1196
1197/*
1198 * acpi_dock_match - see if an acpi object has a _DCK method
1199 */
1200bool acpi_dock_match(acpi_handle handle)
1201{
1202 return acpi_has_method(handle, "_DCK");
1203}
1204
1205static acpi_status
1206acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1207 void **return_value)
1208{
1209 long *cap = context;
1210
1211 if (acpi_has_method(handle, "_BCM") &&
1212 acpi_has_method(handle, "_BCL")) {
1213 acpi_handle_debug(handle, "Found generic backlight support\n");
1214 *cap |= ACPI_VIDEO_BACKLIGHT;
1215 /* We have backlight support, no need to scan further */
1216 return AE_CTRL_TERMINATE;
1217 }
1218 return 0;
1219}
1220
1221/* Returns true if the ACPI object is a video device which can be
1222 * handled by video.ko.
1223 * The device will get a Linux specific CID added in scan.c to
1224 * identify the device as an ACPI graphics device
1225 * Be aware that the graphics device may not be physically present
1226 * Use acpi_video_get_capabilities() to detect general ACPI video
1227 * capabilities of present cards
1228 */
1229long acpi_is_video_device(acpi_handle handle)
1230{
1231 long video_caps = 0;
1232
1233 /* Is this device able to support video switching ? */
1234 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1235 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1236
1237 /* Is this device able to retrieve a video ROM ? */
1238 if (acpi_has_method(handle, "_ROM"))
1239 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1240
1241 /* Is this device able to configure which video head to be POSTed ? */
1242 if (acpi_has_method(handle, "_VPO") &&
1243 acpi_has_method(handle, "_GPD") &&
1244 acpi_has_method(handle, "_SPD"))
1245 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1246
1247 /* Only check for backlight functionality if one of the above hit. */
1248 if (video_caps)
1249 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1250 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1251 &video_caps, NULL);
1252
1253 return video_caps;
1254}
1255EXPORT_SYMBOL(acpi_is_video_device);
1256
1257const char *acpi_device_hid(struct acpi_device *device)
1258{
1259 struct acpi_hardware_id *hid;
1260
1261 if (list_empty(&device->pnp.ids))
1262 return dummy_hid;
1263
1264 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1265 return hid->id;
1266}
1267EXPORT_SYMBOL(acpi_device_hid);
1268
1269static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1270{
1271 struct acpi_hardware_id *id;
1272
1273 id = kmalloc(sizeof(*id), GFP_KERNEL);
1274 if (!id)
1275 return;
1276
1277 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1278 if (!id->id) {
1279 kfree(id);
1280 return;
1281 }
1282
1283 list_add_tail(&id->list, &pnp->ids);
1284 pnp->type.hardware_id = 1;
1285}
1286
1287/*
1288 * Old IBM workstations have a DSDT bug wherein the SMBus object
1289 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1290 * prefix. Work around this.
1291 */
1292static bool acpi_ibm_smbus_match(acpi_handle handle)
1293{
1294 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1295 struct acpi_buffer path = { sizeof(node_name), node_name };
1296
1297 if (!dmi_name_in_vendors("IBM"))
1298 return false;
1299
1300 /* Look for SMBS object */
1301 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1302 strcmp("SMBS", path.pointer))
1303 return false;
1304
1305 /* Does it have the necessary (but misnamed) methods? */
1306 if (acpi_has_method(handle, "SBI") &&
1307 acpi_has_method(handle, "SBR") &&
1308 acpi_has_method(handle, "SBW"))
1309 return true;
1310
1311 return false;
1312}
1313
1314static bool acpi_object_is_system_bus(acpi_handle handle)
1315{
1316 acpi_handle tmp;
1317
1318 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1319 tmp == handle)
1320 return true;
1321 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1322 tmp == handle)
1323 return true;
1324
1325 return false;
1326}
1327
1328static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1329 int device_type)
1330{
1331 struct acpi_device_info *info = NULL;
1332 struct acpi_pnp_device_id_list *cid_list;
1333 int i;
1334
1335 switch (device_type) {
1336 case ACPI_BUS_TYPE_DEVICE:
1337 if (handle == ACPI_ROOT_OBJECT) {
1338 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1339 break;
1340 }
1341
1342 acpi_get_object_info(handle, &info);
1343 if (!info) {
1344 pr_err("%s: Error reading device info\n", __func__);
1345 return;
1346 }
1347
1348 if (info->valid & ACPI_VALID_HID) {
1349 acpi_add_id(pnp, info->hardware_id.string);
1350 pnp->type.platform_id = 1;
1351 }
1352 if (info->valid & ACPI_VALID_CID) {
1353 cid_list = &info->compatible_id_list;
1354 for (i = 0; i < cid_list->count; i++)
1355 acpi_add_id(pnp, cid_list->ids[i].string);
1356 }
1357 if (info->valid & ACPI_VALID_ADR) {
1358 pnp->bus_address = info->address;
1359 pnp->type.bus_address = 1;
1360 }
1361 if (info->valid & ACPI_VALID_UID)
1362 pnp->unique_id = kstrdup(info->unique_id.string,
1363 GFP_KERNEL);
1364 if (info->valid & ACPI_VALID_CLS)
1365 acpi_add_id(pnp, info->class_code.string);
1366
1367 kfree(info);
1368
1369 /*
1370 * Some devices don't reliably have _HIDs & _CIDs, so add
1371 * synthetic HIDs to make sure drivers can find them.
1372 */
1373 if (acpi_is_video_device(handle)) {
1374 acpi_add_id(pnp, ACPI_VIDEO_HID);
1375 pnp->type.backlight = 1;
1376 break;
1377 }
1378 if (acpi_bay_match(handle))
1379 acpi_add_id(pnp, ACPI_BAY_HID);
1380 else if (acpi_dock_match(handle))
1381 acpi_add_id(pnp, ACPI_DOCK_HID);
1382 else if (acpi_ibm_smbus_match(handle))
1383 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1384 else if (list_empty(&pnp->ids) &&
1385 acpi_object_is_system_bus(handle)) {
1386 /* \_SB, \_TZ, LNXSYBUS */
1387 acpi_add_id(pnp, ACPI_BUS_HID);
1388 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1389 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1390 }
1391
1392 break;
1393 case ACPI_BUS_TYPE_POWER:
1394 acpi_add_id(pnp, ACPI_POWER_HID);
1395 break;
1396 case ACPI_BUS_TYPE_PROCESSOR:
1397 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1398 break;
1399 case ACPI_BUS_TYPE_THERMAL:
1400 acpi_add_id(pnp, ACPI_THERMAL_HID);
1401 break;
1402 case ACPI_BUS_TYPE_POWER_BUTTON:
1403 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1404 break;
1405 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1406 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1407 break;
1408 case ACPI_BUS_TYPE_ECDT_EC:
1409 acpi_add_id(pnp, ACPI_ECDT_HID);
1410 break;
1411 }
1412}
1413
1414void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1415{
1416 struct acpi_hardware_id *id, *tmp;
1417
1418 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1419 kfree_const(id->id);
1420 kfree(id);
1421 }
1422 kfree(pnp->unique_id);
1423}
1424
1425/**
1426 * acpi_dma_supported - Check DMA support for the specified device.
1427 * @adev: The pointer to acpi device
1428 *
1429 * Return false if DMA is not supported. Otherwise, return true
1430 */
1431bool acpi_dma_supported(const struct acpi_device *adev)
1432{
1433 if (!adev)
1434 return false;
1435
1436 if (adev->flags.cca_seen)
1437 return true;
1438
1439 /*
1440 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1441 * DMA on "Intel platforms". Presumably that includes all x86 and
1442 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1443 */
1444 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1445 return true;
1446
1447 return false;
1448}
1449
1450/**
1451 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1452 * @adev: The pointer to acpi device
1453 *
1454 * Return enum dev_dma_attr.
1455 */
1456enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1457{
1458 if (!acpi_dma_supported(adev))
1459 return DEV_DMA_NOT_SUPPORTED;
1460
1461 if (adev->flags.coherent_dma)
1462 return DEV_DMA_COHERENT;
1463 else
1464 return DEV_DMA_NON_COHERENT;
1465}
1466
1467/**
1468 * acpi_dma_get_range() - Get device DMA parameters.
1469 *
1470 * @dev: device to configure
1471 * @map: pointer to DMA ranges result
1472 *
1473 * Evaluate DMA regions and return pointer to DMA regions on
1474 * parsing success; it does not update the passed in values on failure.
1475 *
1476 * Return 0 on success, < 0 on failure.
1477 */
1478int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1479{
1480 struct acpi_device *adev;
1481 LIST_HEAD(list);
1482 struct resource_entry *rentry;
1483 int ret;
1484 struct device *dma_dev = dev;
1485 struct bus_dma_region *r;
1486
1487 /*
1488 * Walk the device tree chasing an ACPI companion with a _DMA
1489 * object while we go. Stop if we find a device with an ACPI
1490 * companion containing a _DMA method.
1491 */
1492 do {
1493 adev = ACPI_COMPANION(dma_dev);
1494 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1495 break;
1496
1497 dma_dev = dma_dev->parent;
1498 } while (dma_dev);
1499
1500 if (!dma_dev)
1501 return -ENODEV;
1502
1503 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1504 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1505 return -EINVAL;
1506 }
1507
1508 ret = acpi_dev_get_dma_resources(adev, &list);
1509 if (ret > 0) {
1510 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1511 if (!r) {
1512 ret = -ENOMEM;
1513 goto out;
1514 }
1515
1516 *map = r;
1517
1518 list_for_each_entry(rentry, &list, node) {
1519 if (rentry->res->start >= rentry->res->end) {
1520 kfree(*map);
1521 *map = NULL;
1522 ret = -EINVAL;
1523 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1524 goto out;
1525 }
1526
1527 r->cpu_start = rentry->res->start;
1528 r->dma_start = rentry->res->start - rentry->offset;
1529 r->size = resource_size(rentry->res);
1530 r->offset = rentry->offset;
1531 r++;
1532 }
1533 }
1534 out:
1535 acpi_dev_free_resource_list(&list);
1536
1537 return ret >= 0 ? 0 : ret;
1538}
1539
1540#ifdef CONFIG_IOMMU_API
1541int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1542 struct fwnode_handle *fwnode,
1543 const struct iommu_ops *ops)
1544{
1545 int ret = iommu_fwspec_init(dev, fwnode, ops);
1546
1547 if (!ret)
1548 ret = iommu_fwspec_add_ids(dev, &id, 1);
1549
1550 return ret;
1551}
1552
1553static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1554{
1555 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1556
1557 return fwspec ? fwspec->ops : NULL;
1558}
1559
1560static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1561 const u32 *id_in)
1562{
1563 int err;
1564 const struct iommu_ops *ops;
1565
1566 /*
1567 * If we already translated the fwspec there is nothing left to do,
1568 * return the iommu_ops.
1569 */
1570 ops = acpi_iommu_fwspec_ops(dev);
1571 if (ops)
1572 return ops;
1573
1574 err = iort_iommu_configure_id(dev, id_in);
1575 if (err && err != -EPROBE_DEFER)
1576 err = viot_iommu_configure(dev);
1577
1578 /*
1579 * If we have reason to believe the IOMMU driver missed the initial
1580 * iommu_probe_device() call for dev, replay it to get things in order.
1581 */
1582 if (!err && dev->bus && !device_iommu_mapped(dev))
1583 err = iommu_probe_device(dev);
1584
1585 /* Ignore all other errors apart from EPROBE_DEFER */
1586 if (err == -EPROBE_DEFER) {
1587 return ERR_PTR(err);
1588 } else if (err) {
1589 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1590 return NULL;
1591 }
1592 return acpi_iommu_fwspec_ops(dev);
1593}
1594
1595#else /* !CONFIG_IOMMU_API */
1596
1597int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1598 struct fwnode_handle *fwnode,
1599 const struct iommu_ops *ops)
1600{
1601 return -ENODEV;
1602}
1603
1604static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
1605 const u32 *id_in)
1606{
1607 return NULL;
1608}
1609
1610#endif /* !CONFIG_IOMMU_API */
1611
1612/**
1613 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1614 * @dev: The pointer to the device
1615 * @attr: device dma attributes
1616 * @input_id: input device id const value pointer
1617 */
1618int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1619 const u32 *input_id)
1620{
1621 const struct iommu_ops *iommu;
1622
1623 if (attr == DEV_DMA_NOT_SUPPORTED) {
1624 set_dma_ops(dev, &dma_dummy_ops);
1625 return 0;
1626 }
1627
1628 acpi_arch_dma_setup(dev);
1629
1630 iommu = acpi_iommu_configure_id(dev, input_id);
1631 if (PTR_ERR(iommu) == -EPROBE_DEFER)
1632 return -EPROBE_DEFER;
1633
1634 arch_setup_dma_ops(dev, 0, U64_MAX,
1635 iommu, attr == DEV_DMA_COHERENT);
1636
1637 return 0;
1638}
1639EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1640
1641static void acpi_init_coherency(struct acpi_device *adev)
1642{
1643 unsigned long long cca = 0;
1644 acpi_status status;
1645 struct acpi_device *parent = acpi_dev_parent(adev);
1646
1647 if (parent && parent->flags.cca_seen) {
1648 /*
1649 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1650 * already saw one.
1651 */
1652 adev->flags.cca_seen = 1;
1653 cca = parent->flags.coherent_dma;
1654 } else {
1655 status = acpi_evaluate_integer(adev->handle, "_CCA",
1656 NULL, &cca);
1657 if (ACPI_SUCCESS(status))
1658 adev->flags.cca_seen = 1;
1659 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1660 /*
1661 * If architecture does not specify that _CCA is
1662 * required for DMA-able devices (e.g. x86),
1663 * we default to _CCA=1.
1664 */
1665 cca = 1;
1666 else
1667 acpi_handle_debug(adev->handle,
1668 "ACPI device is missing _CCA.\n");
1669 }
1670
1671 adev->flags.coherent_dma = cca;
1672}
1673
1674static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1675{
1676 bool *is_serial_bus_slave_p = data;
1677
1678 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1679 return 1;
1680
1681 *is_serial_bus_slave_p = true;
1682
1683 /* no need to do more checking */
1684 return -1;
1685}
1686
1687static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1688{
1689 struct acpi_device *parent = acpi_dev_parent(device);
1690 static const struct acpi_device_id indirect_io_hosts[] = {
1691 {"HISI0191", 0},
1692 {}
1693 };
1694
1695 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1696}
1697
1698static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1699{
1700 struct list_head resource_list;
1701 bool is_serial_bus_slave = false;
1702 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1703 /*
1704 * These devices have multiple SerialBus resources and a client
1705 * device must be instantiated for each of them, each with
1706 * its own device id.
1707 * Normally we only instantiate one client device for the first
1708 * resource, using the ACPI HID as id. These special cases are handled
1709 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1710 * knows which client device id to use for each resource.
1711 */
1712 {"BSG1160", },
1713 {"BSG2150", },
1714 {"CSC3551", },
1715 {"INT33FE", },
1716 {"INT3515", },
1717 /* Non-conforming _HID for Cirrus Logic already released */
1718 {"CLSA0100", },
1719 {"CLSA0101", },
1720 /*
1721 * Some ACPI devs contain SerialBus resources even though they are not
1722 * attached to a serial bus at all.
1723 */
1724 {"MSHW0028", },
1725 /*
1726 * HIDs of device with an UartSerialBusV2 resource for which userspace
1727 * expects a regular tty cdev to be created (instead of the in kernel
1728 * serdev) and which have a kernel driver which expects a platform_dev
1729 * such as the rfkill-gpio driver.
1730 */
1731 {"BCM4752", },
1732 {"LNV4752", },
1733 {}
1734 };
1735
1736 if (acpi_is_indirect_io_slave(device))
1737 return true;
1738
1739 /* Macs use device properties in lieu of _CRS resources */
1740 if (x86_apple_machine &&
1741 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1742 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1743 fwnode_property_present(&device->fwnode, "baud")))
1744 return true;
1745
1746 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1747 return false;
1748
1749 INIT_LIST_HEAD(&resource_list);
1750 acpi_dev_get_resources(device, &resource_list,
1751 acpi_check_serial_bus_slave,
1752 &is_serial_bus_slave);
1753 acpi_dev_free_resource_list(&resource_list);
1754
1755 return is_serial_bus_slave;
1756}
1757
1758void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1759 int type, void (*release)(struct device *))
1760{
1761 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1762
1763 INIT_LIST_HEAD(&device->pnp.ids);
1764 device->device_type = type;
1765 device->handle = handle;
1766 device->dev.parent = parent ? &parent->dev : NULL;
1767 device->dev.release = release;
1768 device->dev.bus = &acpi_bus_type;
1769 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1770 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1771 acpi_device_get_busid(device);
1772 acpi_set_pnp_ids(handle, &device->pnp, type);
1773 acpi_init_properties(device);
1774 acpi_bus_get_flags(device);
1775 device->flags.match_driver = false;
1776 device->flags.initialized = true;
1777 device->flags.enumeration_by_parent =
1778 acpi_device_enumeration_by_parent(device);
1779 acpi_device_clear_enumerated(device);
1780 device_initialize(&device->dev);
1781 dev_set_uevent_suppress(&device->dev, true);
1782 acpi_init_coherency(device);
1783}
1784
1785static void acpi_scan_dep_init(struct acpi_device *adev)
1786{
1787 struct acpi_dep_data *dep;
1788
1789 list_for_each_entry(dep, &acpi_dep_list, node) {
1790 if (dep->consumer == adev->handle) {
1791 if (dep->honor_dep)
1792 adev->flags.honor_deps = 1;
1793
1794 adev->dep_unmet++;
1795 }
1796 }
1797}
1798
1799void acpi_device_add_finalize(struct acpi_device *device)
1800{
1801 dev_set_uevent_suppress(&device->dev, false);
1802 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1803}
1804
1805static void acpi_scan_init_status(struct acpi_device *adev)
1806{
1807 if (acpi_bus_get_status(adev))
1808 acpi_set_device_status(adev, 0);
1809}
1810
1811static int acpi_add_single_object(struct acpi_device **child,
1812 acpi_handle handle, int type, bool dep_init)
1813{
1814 struct acpi_device *device;
1815 bool release_dep_lock = false;
1816 int result;
1817
1818 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1819 if (!device)
1820 return -ENOMEM;
1821
1822 acpi_init_device_object(device, handle, type, acpi_device_release);
1823 /*
1824 * Getting the status is delayed till here so that we can call
1825 * acpi_bus_get_status() and use its quirk handling. Note that
1826 * this must be done before the get power-/wakeup_dev-flags calls.
1827 */
1828 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1829 if (dep_init) {
1830 mutex_lock(&acpi_dep_list_lock);
1831 /*
1832 * Hold the lock until the acpi_tie_acpi_dev() call
1833 * below to prevent concurrent acpi_scan_clear_dep()
1834 * from deleting a dependency list entry without
1835 * updating dep_unmet for the device.
1836 */
1837 release_dep_lock = true;
1838 acpi_scan_dep_init(device);
1839 }
1840 acpi_scan_init_status(device);
1841 }
1842
1843 acpi_bus_get_power_flags(device);
1844 acpi_bus_get_wakeup_device_flags(device);
1845
1846 result = acpi_tie_acpi_dev(device);
1847
1848 if (release_dep_lock)
1849 mutex_unlock(&acpi_dep_list_lock);
1850
1851 if (!result)
1852 result = acpi_device_add(device);
1853
1854 if (result) {
1855 acpi_device_release(&device->dev);
1856 return result;
1857 }
1858
1859 acpi_power_add_remove_device(device, true);
1860 acpi_device_add_finalize(device);
1861
1862 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1863 dev_name(&device->dev), device->dev.parent ?
1864 dev_name(device->dev.parent) : "(null)");
1865
1866 *child = device;
1867 return 0;
1868}
1869
1870static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1871 void *context)
1872{
1873 struct resource *res = context;
1874
1875 if (acpi_dev_resource_memory(ares, res))
1876 return AE_CTRL_TERMINATE;
1877
1878 return AE_OK;
1879}
1880
1881static bool acpi_device_should_be_hidden(acpi_handle handle)
1882{
1883 acpi_status status;
1884 struct resource res;
1885
1886 /* Check if it should ignore the UART device */
1887 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1888 return false;
1889
1890 /*
1891 * The UART device described in SPCR table is assumed to have only one
1892 * memory resource present. So we only look for the first one here.
1893 */
1894 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1895 acpi_get_resource_memory, &res);
1896 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1897 return false;
1898
1899 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1900 &res.start);
1901
1902 return true;
1903}
1904
1905bool acpi_device_is_present(const struct acpi_device *adev)
1906{
1907 return adev->status.present || adev->status.functional;
1908}
1909
1910static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1911 const char *idstr,
1912 const struct acpi_device_id **matchid)
1913{
1914 const struct acpi_device_id *devid;
1915
1916 if (handler->match)
1917 return handler->match(idstr, matchid);
1918
1919 for (devid = handler->ids; devid->id[0]; devid++)
1920 if (!strcmp((char *)devid->id, idstr)) {
1921 if (matchid)
1922 *matchid = devid;
1923
1924 return true;
1925 }
1926
1927 return false;
1928}
1929
1930static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1931 const struct acpi_device_id **matchid)
1932{
1933 struct acpi_scan_handler *handler;
1934
1935 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1936 if (acpi_scan_handler_matching(handler, idstr, matchid))
1937 return handler;
1938
1939 return NULL;
1940}
1941
1942void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1943{
1944 if (!!hotplug->enabled == !!val)
1945 return;
1946
1947 mutex_lock(&acpi_scan_lock);
1948
1949 hotplug->enabled = val;
1950
1951 mutex_unlock(&acpi_scan_lock);
1952}
1953
1954static void acpi_scan_init_hotplug(struct acpi_device *adev)
1955{
1956 struct acpi_hardware_id *hwid;
1957
1958 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1959 acpi_dock_add(adev);
1960 return;
1961 }
1962 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1963 struct acpi_scan_handler *handler;
1964
1965 handler = acpi_scan_match_handler(hwid->id, NULL);
1966 if (handler) {
1967 adev->flags.hotplug_notify = true;
1968 break;
1969 }
1970 }
1971}
1972
1973static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
1974{
1975 struct acpi_handle_list dep_devices;
1976 acpi_status status;
1977 u32 count;
1978 int i;
1979
1980 /*
1981 * Check for _HID here to avoid deferring the enumeration of:
1982 * 1. PCI devices.
1983 * 2. ACPI nodes describing USB ports.
1984 * Still, checking for _HID catches more then just these cases ...
1985 */
1986 if (!check_dep || !acpi_has_method(handle, "_DEP") ||
1987 !acpi_has_method(handle, "_HID"))
1988 return 0;
1989
1990 status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
1991 if (ACPI_FAILURE(status)) {
1992 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
1993 return 0;
1994 }
1995
1996 for (count = 0, i = 0; i < dep_devices.count; i++) {
1997 struct acpi_device_info *info;
1998 struct acpi_dep_data *dep;
1999 bool skip, honor_dep;
2000
2001 status = acpi_get_object_info(dep_devices.handles[i], &info);
2002 if (ACPI_FAILURE(status)) {
2003 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2004 continue;
2005 }
2006
2007 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2008 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2009 kfree(info);
2010
2011 if (skip)
2012 continue;
2013
2014 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2015 if (!dep)
2016 continue;
2017
2018 count++;
2019
2020 dep->supplier = dep_devices.handles[i];
2021 dep->consumer = handle;
2022 dep->honor_dep = honor_dep;
2023
2024 mutex_lock(&acpi_dep_list_lock);
2025 list_add_tail(&dep->node , &acpi_dep_list);
2026 mutex_unlock(&acpi_dep_list_lock);
2027 }
2028
2029 return count;
2030}
2031
2032static bool acpi_bus_scan_second_pass;
2033
2034static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
2035 struct acpi_device **adev_p)
2036{
2037 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2038 acpi_object_type acpi_type;
2039 int type;
2040
2041 if (device)
2042 goto out;
2043
2044 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2045 return AE_OK;
2046
2047 switch (acpi_type) {
2048 case ACPI_TYPE_DEVICE:
2049 if (acpi_device_should_be_hidden(handle))
2050 return AE_OK;
2051
2052 /* Bail out if there are dependencies. */
2053 if (acpi_scan_check_dep(handle, check_dep) > 0) {
2054 acpi_bus_scan_second_pass = true;
2055 return AE_CTRL_DEPTH;
2056 }
2057
2058 fallthrough;
2059 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2060 type = ACPI_BUS_TYPE_DEVICE;
2061 break;
2062
2063 case ACPI_TYPE_PROCESSOR:
2064 type = ACPI_BUS_TYPE_PROCESSOR;
2065 break;
2066
2067 case ACPI_TYPE_THERMAL:
2068 type = ACPI_BUS_TYPE_THERMAL;
2069 break;
2070
2071 case ACPI_TYPE_POWER:
2072 acpi_add_power_resource(handle);
2073 fallthrough;
2074 default:
2075 return AE_OK;
2076 }
2077
2078 /*
2079 * If check_dep is true at this point, the device has no dependencies,
2080 * or the creation of the device object would have been postponed above.
2081 */
2082 acpi_add_single_object(&device, handle, type, !check_dep);
2083 if (!device)
2084 return AE_CTRL_DEPTH;
2085
2086 acpi_scan_init_hotplug(device);
2087
2088out:
2089 if (!*adev_p)
2090 *adev_p = device;
2091
2092 return AE_OK;
2093}
2094
2095static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2096 void *not_used, void **ret_p)
2097{
2098 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2099}
2100
2101static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2102 void *not_used, void **ret_p)
2103{
2104 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2105}
2106
2107static void acpi_default_enumeration(struct acpi_device *device)
2108{
2109 /*
2110 * Do not enumerate devices with enumeration_by_parent flag set as
2111 * they will be enumerated by their respective parents.
2112 */
2113 if (!device->flags.enumeration_by_parent) {
2114 acpi_create_platform_device(device, NULL);
2115 acpi_device_set_enumerated(device);
2116 } else {
2117 blocking_notifier_call_chain(&acpi_reconfig_chain,
2118 ACPI_RECONFIG_DEVICE_ADD, device);
2119 }
2120}
2121
2122static const struct acpi_device_id generic_device_ids[] = {
2123 {ACPI_DT_NAMESPACE_HID, },
2124 {"", },
2125};
2126
2127static int acpi_generic_device_attach(struct acpi_device *adev,
2128 const struct acpi_device_id *not_used)
2129{
2130 /*
2131 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2132 * below can be unconditional.
2133 */
2134 if (adev->data.of_compatible)
2135 acpi_default_enumeration(adev);
2136
2137 return 1;
2138}
2139
2140static struct acpi_scan_handler generic_device_handler = {
2141 .ids = generic_device_ids,
2142 .attach = acpi_generic_device_attach,
2143};
2144
2145static int acpi_scan_attach_handler(struct acpi_device *device)
2146{
2147 struct acpi_hardware_id *hwid;
2148 int ret = 0;
2149
2150 list_for_each_entry(hwid, &device->pnp.ids, list) {
2151 const struct acpi_device_id *devid;
2152 struct acpi_scan_handler *handler;
2153
2154 handler = acpi_scan_match_handler(hwid->id, &devid);
2155 if (handler) {
2156 if (!handler->attach) {
2157 device->pnp.type.platform_id = 0;
2158 continue;
2159 }
2160 device->handler = handler;
2161 ret = handler->attach(device, devid);
2162 if (ret > 0)
2163 break;
2164
2165 device->handler = NULL;
2166 if (ret < 0)
2167 break;
2168 }
2169 }
2170
2171 return ret;
2172}
2173
2174static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2175{
2176 bool skip = !first_pass && device->flags.visited;
2177 acpi_handle ejd;
2178 int ret;
2179
2180 if (skip)
2181 goto ok;
2182
2183 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2184 register_dock_dependent_device(device, ejd);
2185
2186 acpi_bus_get_status(device);
2187 /* Skip devices that are not ready for enumeration (e.g. not present) */
2188 if (!acpi_dev_ready_for_enumeration(device)) {
2189 device->flags.initialized = false;
2190 acpi_device_clear_enumerated(device);
2191 device->flags.power_manageable = 0;
2192 return 0;
2193 }
2194 if (device->handler)
2195 goto ok;
2196
2197 if (!device->flags.initialized) {
2198 device->flags.power_manageable =
2199 device->power.states[ACPI_STATE_D0].flags.valid;
2200 if (acpi_bus_init_power(device))
2201 device->flags.power_manageable = 0;
2202
2203 device->flags.initialized = true;
2204 } else if (device->flags.visited) {
2205 goto ok;
2206 }
2207
2208 ret = acpi_scan_attach_handler(device);
2209 if (ret < 0)
2210 return 0;
2211
2212 device->flags.match_driver = true;
2213 if (ret > 0 && !device->flags.enumeration_by_parent) {
2214 acpi_device_set_enumerated(device);
2215 goto ok;
2216 }
2217
2218 ret = device_attach(&device->dev);
2219 if (ret < 0)
2220 return 0;
2221
2222 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2223 acpi_default_enumeration(device);
2224 else
2225 acpi_device_set_enumerated(device);
2226
2227ok:
2228 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2229
2230 if (!skip && device->handler && device->handler->hotplug.notify_online)
2231 device->handler->hotplug.notify_online(device);
2232
2233 return 0;
2234}
2235
2236static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2237{
2238 struct acpi_device **adev_p = data;
2239 struct acpi_device *adev = *adev_p;
2240
2241 /*
2242 * If we're passed a 'previous' consumer device then we need to skip
2243 * any consumers until we meet the previous one, and then NULL @data
2244 * so the next one can be returned.
2245 */
2246 if (adev) {
2247 if (dep->consumer == adev->handle)
2248 *adev_p = NULL;
2249
2250 return 0;
2251 }
2252
2253 adev = acpi_get_acpi_dev(dep->consumer);
2254 if (adev) {
2255 *(struct acpi_device **)data = adev;
2256 return 1;
2257 }
2258 /* Continue parsing if the device object is not present. */
2259 return 0;
2260}
2261
2262struct acpi_scan_clear_dep_work {
2263 struct work_struct work;
2264 struct acpi_device *adev;
2265};
2266
2267static void acpi_scan_clear_dep_fn(struct work_struct *work)
2268{
2269 struct acpi_scan_clear_dep_work *cdw;
2270
2271 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2272
2273 acpi_scan_lock_acquire();
2274 acpi_bus_attach(cdw->adev, (void *)true);
2275 acpi_scan_lock_release();
2276
2277 acpi_dev_put(cdw->adev);
2278 kfree(cdw);
2279}
2280
2281static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2282{
2283 struct acpi_scan_clear_dep_work *cdw;
2284
2285 if (adev->dep_unmet)
2286 return false;
2287
2288 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2289 if (!cdw)
2290 return false;
2291
2292 cdw->adev = adev;
2293 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2294 /*
2295 * Since the work function may block on the lock until the entire
2296 * initial enumeration of devices is complete, put it into the unbound
2297 * workqueue.
2298 */
2299 queue_work(system_unbound_wq, &cdw->work);
2300
2301 return true;
2302}
2303
2304static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2305{
2306 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2307
2308 if (adev) {
2309 adev->dep_unmet--;
2310 if (!acpi_scan_clear_dep_queue(adev))
2311 acpi_dev_put(adev);
2312 }
2313
2314 list_del(&dep->node);
2315 kfree(dep);
2316
2317 return 0;
2318}
2319
2320/**
2321 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2322 * @handle: The ACPI handle of the supplier device
2323 * @callback: Pointer to the callback function to apply
2324 * @data: Pointer to some data to pass to the callback
2325 *
2326 * The return value of the callback determines this function's behaviour. If 0
2327 * is returned we continue to iterate over acpi_dep_list. If a positive value
2328 * is returned then the loop is broken but this function returns 0. If a
2329 * negative value is returned by the callback then the loop is broken and that
2330 * value is returned as the final error.
2331 */
2332static int acpi_walk_dep_device_list(acpi_handle handle,
2333 int (*callback)(struct acpi_dep_data *, void *),
2334 void *data)
2335{
2336 struct acpi_dep_data *dep, *tmp;
2337 int ret = 0;
2338
2339 mutex_lock(&acpi_dep_list_lock);
2340 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2341 if (dep->supplier == handle) {
2342 ret = callback(dep, data);
2343 if (ret)
2344 break;
2345 }
2346 }
2347 mutex_unlock(&acpi_dep_list_lock);
2348
2349 return ret > 0 ? 0 : ret;
2350}
2351
2352/**
2353 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2354 * @supplier: Pointer to the supplier &struct acpi_device
2355 *
2356 * Clear dependencies on the given device.
2357 */
2358void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2359{
2360 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2361}
2362EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2363
2364/**
2365 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2366 * @device: Pointer to the &struct acpi_device to check
2367 *
2368 * Check if the device is present and has no unmet dependencies.
2369 *
2370 * Return true if the device is ready for enumeratino. Otherwise, return false.
2371 */
2372bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2373{
2374 if (device->flags.honor_deps && device->dep_unmet)
2375 return false;
2376
2377 return acpi_device_is_present(device);
2378}
2379EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2380
2381/**
2382 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2383 * @supplier: Pointer to the dependee device
2384 * @start: Pointer to the current dependent device
2385 *
2386 * Returns the next &struct acpi_device which declares itself dependent on
2387 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2388 *
2389 * If the returned adev is not passed as @start to this function, the caller is
2390 * responsible for putting the reference to adev when it is no longer needed.
2391 */
2392struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2393 struct acpi_device *start)
2394{
2395 struct acpi_device *adev = start;
2396
2397 acpi_walk_dep_device_list(supplier->handle,
2398 acpi_dev_get_next_consumer_dev_cb, &adev);
2399
2400 acpi_dev_put(start);
2401
2402 if (adev == start)
2403 return NULL;
2404
2405 return adev;
2406}
2407EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2408
2409/**
2410 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2411 * @handle: Root of the namespace scope to scan.
2412 *
2413 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2414 * found devices.
2415 *
2416 * If no devices were found, -ENODEV is returned, but it does not mean that
2417 * there has been a real error. There just have been no suitable ACPI objects
2418 * in the table trunk from which the kernel could create a device and add an
2419 * appropriate driver.
2420 *
2421 * Must be called under acpi_scan_lock.
2422 */
2423int acpi_bus_scan(acpi_handle handle)
2424{
2425 struct acpi_device *device = NULL;
2426
2427 acpi_bus_scan_second_pass = false;
2428
2429 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2430
2431 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2432 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2433 acpi_bus_check_add_1, NULL, NULL,
2434 (void **)&device);
2435
2436 if (!device)
2437 return -ENODEV;
2438
2439 acpi_bus_attach(device, (void *)true);
2440
2441 if (!acpi_bus_scan_second_pass)
2442 return 0;
2443
2444 /* Pass 2: Enumerate all of the remaining devices. */
2445
2446 device = NULL;
2447
2448 if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
2449 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2450 acpi_bus_check_add_2, NULL, NULL,
2451 (void **)&device);
2452
2453 acpi_bus_attach(device, NULL);
2454
2455 return 0;
2456}
2457EXPORT_SYMBOL(acpi_bus_scan);
2458
2459static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
2460{
2461 struct acpi_scan_handler *handler = adev->handler;
2462
2463 acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
2464
2465 adev->flags.match_driver = false;
2466 if (handler) {
2467 if (handler->detach)
2468 handler->detach(adev);
2469
2470 adev->handler = NULL;
2471 } else {
2472 device_release_driver(&adev->dev);
2473 }
2474 /*
2475 * Most likely, the device is going away, so put it into D3cold before
2476 * that.
2477 */
2478 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2479 adev->flags.initialized = false;
2480 acpi_device_clear_enumerated(adev);
2481
2482 return 0;
2483}
2484
2485/**
2486 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2487 * @adev: Root of the ACPI namespace scope to walk.
2488 *
2489 * Must be called under acpi_scan_lock.
2490 */
2491void acpi_bus_trim(struct acpi_device *adev)
2492{
2493 acpi_bus_trim_one(adev, NULL);
2494}
2495EXPORT_SYMBOL_GPL(acpi_bus_trim);
2496
2497int acpi_bus_register_early_device(int type)
2498{
2499 struct acpi_device *device = NULL;
2500 int result;
2501
2502 result = acpi_add_single_object(&device, NULL, type, false);
2503 if (result)
2504 return result;
2505
2506 device->flags.match_driver = true;
2507 return device_attach(&device->dev);
2508}
2509EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2510
2511static void acpi_bus_scan_fixed(void)
2512{
2513 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2514 struct acpi_device *adev = NULL;
2515
2516 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2517 false);
2518 if (adev) {
2519 adev->flags.match_driver = true;
2520 if (device_attach(&adev->dev) >= 0)
2521 device_init_wakeup(&adev->dev, true);
2522 else
2523 dev_dbg(&adev->dev, "No driver\n");
2524 }
2525 }
2526
2527 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2528 struct acpi_device *adev = NULL;
2529
2530 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2531 false);
2532 if (adev) {
2533 adev->flags.match_driver = true;
2534 if (device_attach(&adev->dev) < 0)
2535 dev_dbg(&adev->dev, "No driver\n");
2536 }
2537 }
2538}
2539
2540static void __init acpi_get_spcr_uart_addr(void)
2541{
2542 acpi_status status;
2543 struct acpi_table_spcr *spcr_ptr;
2544
2545 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2546 (struct acpi_table_header **)&spcr_ptr);
2547 if (ACPI_FAILURE(status)) {
2548 pr_warn("STAO table present, but SPCR is missing\n");
2549 return;
2550 }
2551
2552 spcr_uart_addr = spcr_ptr->serial_port.address;
2553 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2554}
2555
2556static bool acpi_scan_initialized;
2557
2558void __init acpi_scan_init(void)
2559{
2560 acpi_status status;
2561 struct acpi_table_stao *stao_ptr;
2562
2563 acpi_pci_root_init();
2564 acpi_pci_link_init();
2565 acpi_processor_init();
2566 acpi_platform_init();
2567 acpi_lpss_init();
2568 acpi_apd_init();
2569 acpi_cmos_rtc_init();
2570 acpi_container_init();
2571 acpi_memory_hotplug_init();
2572 acpi_watchdog_init();
2573 acpi_pnp_init();
2574 acpi_int340x_thermal_init();
2575 acpi_amba_init();
2576 acpi_init_lpit();
2577
2578 acpi_scan_add_handler(&generic_device_handler);
2579
2580 /*
2581 * If there is STAO table, check whether it needs to ignore the UART
2582 * device in SPCR table.
2583 */
2584 status = acpi_get_table(ACPI_SIG_STAO, 0,
2585 (struct acpi_table_header **)&stao_ptr);
2586 if (ACPI_SUCCESS(status)) {
2587 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2588 pr_info("STAO Name List not yet supported.\n");
2589
2590 if (stao_ptr->ignore_uart)
2591 acpi_get_spcr_uart_addr();
2592
2593 acpi_put_table((struct acpi_table_header *)stao_ptr);
2594 }
2595
2596 acpi_gpe_apply_masked_gpes();
2597 acpi_update_all_gpes();
2598
2599 /*
2600 * Although we call __add_memory() that is documented to require the
2601 * device_hotplug_lock, it is not necessary here because this is an
2602 * early code when userspace or any other code path cannot trigger
2603 * hotplug/hotunplug operations.
2604 */
2605 mutex_lock(&acpi_scan_lock);
2606 /*
2607 * Enumerate devices in the ACPI namespace.
2608 */
2609 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2610 goto unlock;
2611
2612 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2613 if (!acpi_root)
2614 goto unlock;
2615
2616 /* Fixed feature devices do not exist on HW-reduced platform */
2617 if (!acpi_gbl_reduced_hardware)
2618 acpi_bus_scan_fixed();
2619
2620 acpi_turn_off_unused_power_resources();
2621
2622 acpi_scan_initialized = true;
2623
2624unlock:
2625 mutex_unlock(&acpi_scan_lock);
2626}
2627
2628static struct acpi_probe_entry *ape;
2629static int acpi_probe_count;
2630static DEFINE_MUTEX(acpi_probe_mutex);
2631
2632static int __init acpi_match_madt(union acpi_subtable_headers *header,
2633 const unsigned long end)
2634{
2635 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2636 if (!ape->probe_subtbl(header, end))
2637 acpi_probe_count++;
2638
2639 return 0;
2640}
2641
2642int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2643{
2644 int count = 0;
2645
2646 if (acpi_disabled)
2647 return 0;
2648
2649 mutex_lock(&acpi_probe_mutex);
2650 for (ape = ap_head; nr; ape++, nr--) {
2651 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2652 acpi_probe_count = 0;
2653 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2654 count += acpi_probe_count;
2655 } else {
2656 int res;
2657 res = acpi_table_parse(ape->id, ape->probe_table);
2658 if (!res)
2659 count++;
2660 }
2661 }
2662 mutex_unlock(&acpi_probe_mutex);
2663
2664 return count;
2665}
2666
2667static void acpi_table_events_fn(struct work_struct *work)
2668{
2669 acpi_scan_lock_acquire();
2670 acpi_bus_scan(ACPI_ROOT_OBJECT);
2671 acpi_scan_lock_release();
2672
2673 kfree(work);
2674}
2675
2676void acpi_scan_table_notify(void)
2677{
2678 struct work_struct *work;
2679
2680 if (!acpi_scan_initialized)
2681 return;
2682
2683 work = kmalloc(sizeof(*work), GFP_KERNEL);
2684 if (!work)
2685 return;
2686
2687 INIT_WORK(work, acpi_table_events_fn);
2688 schedule_work(work);
2689}
2690
2691int acpi_reconfig_notifier_register(struct notifier_block *nb)
2692{
2693 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2694}
2695EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2696
2697int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2698{
2699 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2700}
2701EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);