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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; 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 ps->flags.valid = 1;
884 for (j = 0; j < ps->resources.count; j++)
885 acpi_bus_add_power_resource(ps->resources.handles[j]);
886 }
887
888 /* Evaluate "_PSx" to see if we can do explicit sets */
889 object_name[2] = 'S';
890 status = acpi_get_handle(device->handle, object_name, &handle);
891 if (ACPI_SUCCESS(status)) {
892 ps->flags.explicit_set = 1;
893 ps->flags.valid = 1;
894 }
895
896 /* State is valid if we have some power control */
897 if (ps->resources.count || ps->flags.explicit_set)
898 ps->flags.valid = 1;
899
900 ps->power = -1; /* Unknown - driver assigned */
901 ps->latency = -1; /* Unknown - driver assigned */
902 }
903
904 /* Set defaults for D0 and D3 states (always valid) */
905 device->power.states[ACPI_STATE_D0].flags.valid = 1;
906 device->power.states[ACPI_STATE_D0].power = 100;
907 device->power.states[ACPI_STATE_D3].flags.valid = 1;
908 device->power.states[ACPI_STATE_D3].power = 0;
909
910 acpi_bus_init_power(device);
911
912 return 0;
913}
914
915static int acpi_bus_get_flags(struct acpi_device *device)
916{
917 acpi_status status = AE_OK;
918 acpi_handle temp = NULL;
919
920
921 /* Presence of _STA indicates 'dynamic_status' */
922 status = acpi_get_handle(device->handle, "_STA", &temp);
923 if (ACPI_SUCCESS(status))
924 device->flags.dynamic_status = 1;
925
926 /* Presence of _RMV indicates 'removable' */
927 status = acpi_get_handle(device->handle, "_RMV", &temp);
928 if (ACPI_SUCCESS(status))
929 device->flags.removable = 1;
930
931 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
932 status = acpi_get_handle(device->handle, "_EJD", &temp);
933 if (ACPI_SUCCESS(status))
934 device->flags.ejectable = 1;
935 else {
936 status = acpi_get_handle(device->handle, "_EJ0", &temp);
937 if (ACPI_SUCCESS(status))
938 device->flags.ejectable = 1;
939 }
940
941 /* Presence of _LCK indicates 'lockable' */
942 status = acpi_get_handle(device->handle, "_LCK", &temp);
943 if (ACPI_SUCCESS(status))
944 device->flags.lockable = 1;
945
946 /* Power resources cannot be power manageable. */
947 if (device->device_type == ACPI_BUS_TYPE_POWER)
948 return 0;
949
950 /* Presence of _PS0|_PR0 indicates 'power manageable' */
951 status = acpi_get_handle(device->handle, "_PS0", &temp);
952 if (ACPI_FAILURE(status))
953 status = acpi_get_handle(device->handle, "_PR0", &temp);
954 if (ACPI_SUCCESS(status))
955 device->flags.power_manageable = 1;
956
957 /* TBD: Performance management */
958
959 return 0;
960}
961
962static void acpi_device_get_busid(struct acpi_device *device)
963{
964 char bus_id[5] = { '?', 0 };
965 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
966 int i = 0;
967
968 /*
969 * Bus ID
970 * ------
971 * The device's Bus ID is simply the object name.
972 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
973 */
974 if (ACPI_IS_ROOT_DEVICE(device)) {
975 strcpy(device->pnp.bus_id, "ACPI");
976 return;
977 }
978
979 switch (device->device_type) {
980 case ACPI_BUS_TYPE_POWER_BUTTON:
981 strcpy(device->pnp.bus_id, "PWRF");
982 break;
983 case ACPI_BUS_TYPE_SLEEP_BUTTON:
984 strcpy(device->pnp.bus_id, "SLPF");
985 break;
986 default:
987 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
988 /* Clean up trailing underscores (if any) */
989 for (i = 3; i > 1; i--) {
990 if (bus_id[i] == '_')
991 bus_id[i] = '\0';
992 else
993 break;
994 }
995 strcpy(device->pnp.bus_id, bus_id);
996 break;
997 }
998}
999
1000/*
1001 * acpi_bay_match - see if a device is an ejectable driver bay
1002 *
1003 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1004 * then we can safely call it an ejectable drive bay
1005 */
1006static int acpi_bay_match(struct acpi_device *device){
1007 acpi_status status;
1008 acpi_handle handle;
1009 acpi_handle tmp;
1010 acpi_handle phandle;
1011
1012 handle = device->handle;
1013
1014 status = acpi_get_handle(handle, "_EJ0", &tmp);
1015 if (ACPI_FAILURE(status))
1016 return -ENODEV;
1017
1018 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1019 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1020 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1021 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1022 return 0;
1023
1024 if (acpi_get_parent(handle, &phandle))
1025 return -ENODEV;
1026
1027 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1028 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1029 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1030 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1031 return 0;
1032
1033 return -ENODEV;
1034}
1035
1036/*
1037 * acpi_dock_match - see if a device has a _DCK method
1038 */
1039static int acpi_dock_match(struct acpi_device *device)
1040{
1041 acpi_handle tmp;
1042 return acpi_get_handle(device->handle, "_DCK", &tmp);
1043}
1044
1045const char *acpi_device_hid(struct acpi_device *device)
1046{
1047 struct acpi_hardware_id *hid;
1048
1049 if (list_empty(&device->pnp.ids))
1050 return dummy_hid;
1051
1052 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1053 return hid->id;
1054}
1055EXPORT_SYMBOL(acpi_device_hid);
1056
1057static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1058{
1059 struct acpi_hardware_id *id;
1060
1061 id = kmalloc(sizeof(*id), GFP_KERNEL);
1062 if (!id)
1063 return;
1064
1065 id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1066 if (!id->id) {
1067 kfree(id);
1068 return;
1069 }
1070
1071 strcpy(id->id, dev_id);
1072 list_add_tail(&id->list, &device->pnp.ids);
1073}
1074
1075/*
1076 * Old IBM workstations have a DSDT bug wherein the SMBus object
1077 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1078 * prefix. Work around this.
1079 */
1080static int acpi_ibm_smbus_match(struct acpi_device *device)
1081{
1082 acpi_handle h_dummy;
1083 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1084 int result;
1085
1086 if (!dmi_name_in_vendors("IBM"))
1087 return -ENODEV;
1088
1089 /* Look for SMBS object */
1090 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1091 if (result)
1092 return result;
1093
1094 if (strcmp("SMBS", path.pointer)) {
1095 result = -ENODEV;
1096 goto out;
1097 }
1098
1099 /* Does it have the necessary (but misnamed) methods? */
1100 result = -ENODEV;
1101 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1102 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1103 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1104 result = 0;
1105out:
1106 kfree(path.pointer);
1107 return result;
1108}
1109
1110static void acpi_device_set_id(struct acpi_device *device)
1111{
1112 acpi_status status;
1113 struct acpi_device_info *info;
1114 struct acpica_device_id_list *cid_list;
1115 int i;
1116
1117 switch (device->device_type) {
1118 case ACPI_BUS_TYPE_DEVICE:
1119 if (ACPI_IS_ROOT_DEVICE(device)) {
1120 acpi_add_id(device, ACPI_SYSTEM_HID);
1121 break;
1122 }
1123
1124 status = acpi_get_object_info(device->handle, &info);
1125 if (ACPI_FAILURE(status)) {
1126 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1127 return;
1128 }
1129
1130 if (info->valid & ACPI_VALID_HID)
1131 acpi_add_id(device, info->hardware_id.string);
1132 if (info->valid & ACPI_VALID_CID) {
1133 cid_list = &info->compatible_id_list;
1134 for (i = 0; i < cid_list->count; i++)
1135 acpi_add_id(device, cid_list->ids[i].string);
1136 }
1137 if (info->valid & ACPI_VALID_ADR) {
1138 device->pnp.bus_address = info->address;
1139 device->flags.bus_address = 1;
1140 }
1141
1142 kfree(info);
1143
1144 /*
1145 * Some devices don't reliably have _HIDs & _CIDs, so add
1146 * synthetic HIDs to make sure drivers can find them.
1147 */
1148 if (acpi_is_video_device(device))
1149 acpi_add_id(device, ACPI_VIDEO_HID);
1150 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1151 acpi_add_id(device, ACPI_BAY_HID);
1152 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1153 acpi_add_id(device, ACPI_DOCK_HID);
1154 else if (!acpi_ibm_smbus_match(device))
1155 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1156 else if (!acpi_device_hid(device) &&
1157 ACPI_IS_ROOT_DEVICE(device->parent)) {
1158 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1159 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1160 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1161 }
1162
1163 break;
1164 case ACPI_BUS_TYPE_POWER:
1165 acpi_add_id(device, ACPI_POWER_HID);
1166 break;
1167 case ACPI_BUS_TYPE_PROCESSOR:
1168 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1169 break;
1170 case ACPI_BUS_TYPE_THERMAL:
1171 acpi_add_id(device, ACPI_THERMAL_HID);
1172 break;
1173 case ACPI_BUS_TYPE_POWER_BUTTON:
1174 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1175 break;
1176 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1177 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1178 break;
1179 }
1180}
1181
1182static int acpi_device_set_context(struct acpi_device *device)
1183{
1184 acpi_status status;
1185
1186 /*
1187 * Context
1188 * -------
1189 * Attach this 'struct acpi_device' to the ACPI object. This makes
1190 * resolutions from handle->device very efficient. Fixed hardware
1191 * devices have no handles, so we skip them.
1192 */
1193 if (!device->handle)
1194 return 0;
1195
1196 status = acpi_attach_data(device->handle,
1197 acpi_bus_data_handler, device);
1198 if (ACPI_SUCCESS(status))
1199 return 0;
1200
1201 printk(KERN_ERR PREFIX "Error attaching device data\n");
1202 return -ENODEV;
1203}
1204
1205static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1206{
1207 if (!dev)
1208 return -EINVAL;
1209
1210 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1211 device_release_driver(&dev->dev);
1212
1213 if (!rmdevice)
1214 return 0;
1215
1216 /*
1217 * unbind _ADR-Based Devices when hot removal
1218 */
1219 if (dev->flags.bus_address) {
1220 if ((dev->parent) && (dev->parent->ops.unbind))
1221 dev->parent->ops.unbind(dev);
1222 }
1223 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1224
1225 return 0;
1226}
1227
1228static int acpi_add_single_object(struct acpi_device **child,
1229 acpi_handle handle, int type,
1230 unsigned long long sta,
1231 struct acpi_bus_ops *ops)
1232{
1233 int result;
1234 struct acpi_device *device;
1235 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1236
1237 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1238 if (!device) {
1239 printk(KERN_ERR PREFIX "Memory allocation error\n");
1240 return -ENOMEM;
1241 }
1242
1243 INIT_LIST_HEAD(&device->pnp.ids);
1244 device->device_type = type;
1245 device->handle = handle;
1246 device->parent = acpi_bus_get_parent(handle);
1247 device->bus_ops = *ops; /* workround for not call .start */
1248 STRUCT_TO_INT(device->status) = sta;
1249
1250 acpi_device_get_busid(device);
1251
1252 /*
1253 * Flags
1254 * -----
1255 * Note that we only look for object handles -- cannot evaluate objects
1256 * until we know the device is present and properly initialized.
1257 */
1258 result = acpi_bus_get_flags(device);
1259 if (result)
1260 goto end;
1261
1262 /*
1263 * Initialize Device
1264 * -----------------
1265 * TBD: Synch with Core's enumeration/initialization process.
1266 */
1267 acpi_device_set_id(device);
1268
1269 /*
1270 * Power Management
1271 * ----------------
1272 */
1273 if (device->flags.power_manageable) {
1274 result = acpi_bus_get_power_flags(device);
1275 if (result)
1276 goto end;
1277 }
1278
1279 /*
1280 * Wakeup device management
1281 *-----------------------
1282 */
1283 acpi_bus_get_wakeup_device_flags(device);
1284
1285 /*
1286 * Performance Management
1287 * ----------------------
1288 */
1289 if (device->flags.performance_manageable) {
1290 result = acpi_bus_get_perf_flags(device);
1291 if (result)
1292 goto end;
1293 }
1294
1295 if ((result = acpi_device_set_context(device)))
1296 goto end;
1297
1298 result = acpi_device_register(device);
1299
1300 /*
1301 * Bind _ADR-Based Devices when hot add
1302 */
1303 if (device->flags.bus_address) {
1304 if (device->parent && device->parent->ops.bind)
1305 device->parent->ops.bind(device);
1306 }
1307
1308end:
1309 if (!result) {
1310 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1311 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1312 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1313 (char *) buffer.pointer,
1314 device->parent ? dev_name(&device->parent->dev) :
1315 "(null)"));
1316 kfree(buffer.pointer);
1317 *child = device;
1318 } else
1319 acpi_device_release(&device->dev);
1320
1321 return result;
1322}
1323
1324#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1325 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1326
1327static void acpi_bus_add_power_resource(acpi_handle handle)
1328{
1329 struct acpi_bus_ops ops = {
1330 .acpi_op_add = 1,
1331 .acpi_op_start = 1,
1332 };
1333 struct acpi_device *device = NULL;
1334
1335 acpi_bus_get_device(handle, &device);
1336 if (!device)
1337 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1338 ACPI_STA_DEFAULT, &ops);
1339}
1340
1341static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1342 unsigned long long *sta)
1343{
1344 acpi_status status;
1345 acpi_object_type acpi_type;
1346
1347 status = acpi_get_type(handle, &acpi_type);
1348 if (ACPI_FAILURE(status))
1349 return -ENODEV;
1350
1351 switch (acpi_type) {
1352 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1353 case ACPI_TYPE_DEVICE:
1354 *type = ACPI_BUS_TYPE_DEVICE;
1355 status = acpi_bus_get_status_handle(handle, sta);
1356 if (ACPI_FAILURE(status))
1357 return -ENODEV;
1358 break;
1359 case ACPI_TYPE_PROCESSOR:
1360 *type = ACPI_BUS_TYPE_PROCESSOR;
1361 status = acpi_bus_get_status_handle(handle, sta);
1362 if (ACPI_FAILURE(status))
1363 return -ENODEV;
1364 break;
1365 case ACPI_TYPE_THERMAL:
1366 *type = ACPI_BUS_TYPE_THERMAL;
1367 *sta = ACPI_STA_DEFAULT;
1368 break;
1369 case ACPI_TYPE_POWER:
1370 *type = ACPI_BUS_TYPE_POWER;
1371 *sta = ACPI_STA_DEFAULT;
1372 break;
1373 default:
1374 return -ENODEV;
1375 }
1376
1377 return 0;
1378}
1379
1380static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1381 void *context, void **return_value)
1382{
1383 struct acpi_bus_ops *ops = context;
1384 int type;
1385 unsigned long long sta;
1386 struct acpi_device *device;
1387 acpi_status status;
1388 int result;
1389
1390 result = acpi_bus_type_and_status(handle, &type, &sta);
1391 if (result)
1392 return AE_OK;
1393
1394 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1395 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1396 struct acpi_device_wakeup wakeup;
1397 acpi_handle temp;
1398
1399 status = acpi_get_handle(handle, "_PRW", &temp);
1400 if (ACPI_SUCCESS(status))
1401 acpi_bus_extract_wakeup_device_power_package(handle,
1402 &wakeup);
1403 return AE_CTRL_DEPTH;
1404 }
1405
1406 /*
1407 * We may already have an acpi_device from a previous enumeration. If
1408 * so, we needn't add it again, but we may still have to start it.
1409 */
1410 device = NULL;
1411 acpi_bus_get_device(handle, &device);
1412 if (ops->acpi_op_add && !device)
1413 acpi_add_single_object(&device, handle, type, sta, ops);
1414
1415 if (!device)
1416 return AE_CTRL_DEPTH;
1417
1418 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1419 status = acpi_start_single_object(device);
1420 if (ACPI_FAILURE(status))
1421 return AE_CTRL_DEPTH;
1422 }
1423
1424 if (!*return_value)
1425 *return_value = device;
1426 return AE_OK;
1427}
1428
1429static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1430 struct acpi_device **child)
1431{
1432 acpi_status status;
1433 void *device = NULL;
1434
1435 status = acpi_bus_check_add(handle, 0, ops, &device);
1436 if (ACPI_SUCCESS(status))
1437 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1438 acpi_bus_check_add, NULL, ops, &device);
1439
1440 if (child)
1441 *child = device;
1442
1443 if (device)
1444 return 0;
1445 else
1446 return -ENODEV;
1447}
1448
1449/*
1450 * acpi_bus_add and acpi_bus_start
1451 *
1452 * scan a given ACPI tree and (probably recently hot-plugged)
1453 * create and add or starts found devices.
1454 *
1455 * If no devices were found -ENODEV is returned which does not
1456 * mean that this is a real error, there just have been no suitable
1457 * ACPI objects in the table trunk from which the kernel could create
1458 * a device and add/start an appropriate driver.
1459 */
1460
1461int
1462acpi_bus_add(struct acpi_device **child,
1463 struct acpi_device *parent, acpi_handle handle, int type)
1464{
1465 struct acpi_bus_ops ops;
1466
1467 memset(&ops, 0, sizeof(ops));
1468 ops.acpi_op_add = 1;
1469
1470 return acpi_bus_scan(handle, &ops, child);
1471}
1472EXPORT_SYMBOL(acpi_bus_add);
1473
1474int acpi_bus_start(struct acpi_device *device)
1475{
1476 struct acpi_bus_ops ops;
1477 int result;
1478
1479 if (!device)
1480 return -EINVAL;
1481
1482 memset(&ops, 0, sizeof(ops));
1483 ops.acpi_op_start = 1;
1484
1485 result = acpi_bus_scan(device->handle, &ops, NULL);
1486
1487 acpi_update_all_gpes();
1488
1489 return result;
1490}
1491EXPORT_SYMBOL(acpi_bus_start);
1492
1493int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1494{
1495 acpi_status status;
1496 struct acpi_device *parent, *child;
1497 acpi_handle phandle, chandle;
1498 acpi_object_type type;
1499 u32 level = 1;
1500 int err = 0;
1501
1502 parent = start;
1503 phandle = start->handle;
1504 child = chandle = NULL;
1505
1506 while ((level > 0) && parent && (!err)) {
1507 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1508 chandle, &chandle);
1509
1510 /*
1511 * If this scope is exhausted then move our way back up.
1512 */
1513 if (ACPI_FAILURE(status)) {
1514 level--;
1515 chandle = phandle;
1516 acpi_get_parent(phandle, &phandle);
1517 child = parent;
1518 parent = parent->parent;
1519
1520 if (level == 0)
1521 err = acpi_bus_remove(child, rmdevice);
1522 else
1523 err = acpi_bus_remove(child, 1);
1524
1525 continue;
1526 }
1527
1528 status = acpi_get_type(chandle, &type);
1529 if (ACPI_FAILURE(status)) {
1530 continue;
1531 }
1532 /*
1533 * If there is a device corresponding to chandle then
1534 * parse it (depth-first).
1535 */
1536 if (acpi_bus_get_device(chandle, &child) == 0) {
1537 level++;
1538 phandle = chandle;
1539 chandle = NULL;
1540 parent = child;
1541 }
1542 continue;
1543 }
1544 return err;
1545}
1546EXPORT_SYMBOL_GPL(acpi_bus_trim);
1547
1548static int acpi_bus_scan_fixed(void)
1549{
1550 int result = 0;
1551 struct acpi_device *device = NULL;
1552 struct acpi_bus_ops ops;
1553
1554 memset(&ops, 0, sizeof(ops));
1555 ops.acpi_op_add = 1;
1556 ops.acpi_op_start = 1;
1557
1558 /*
1559 * Enumerate all fixed-feature devices.
1560 */
1561 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1562 result = acpi_add_single_object(&device, NULL,
1563 ACPI_BUS_TYPE_POWER_BUTTON,
1564 ACPI_STA_DEFAULT,
1565 &ops);
1566 }
1567
1568 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1569 result = acpi_add_single_object(&device, NULL,
1570 ACPI_BUS_TYPE_SLEEP_BUTTON,
1571 ACPI_STA_DEFAULT,
1572 &ops);
1573 }
1574
1575 return result;
1576}
1577
1578int __init acpi_scan_init(void)
1579{
1580 int result;
1581 struct acpi_bus_ops ops;
1582
1583 memset(&ops, 0, sizeof(ops));
1584 ops.acpi_op_add = 1;
1585 ops.acpi_op_start = 1;
1586
1587 result = bus_register(&acpi_bus_type);
1588 if (result) {
1589 /* We don't want to quit even if we failed to add suspend/resume */
1590 printk(KERN_ERR PREFIX "Could not register bus type\n");
1591 }
1592
1593 acpi_power_init();
1594
1595 /*
1596 * Enumerate devices in the ACPI namespace.
1597 */
1598 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1599
1600 if (!result)
1601 result = acpi_bus_scan_fixed();
1602
1603 if (result)
1604 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1605 else
1606 acpi_update_all_gpes();
1607
1608 return result;
1609}
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#include "sleep.h"
27
28#define ACPI_BUS_CLASS "system_bus"
29#define ACPI_BUS_HID "LNXSYBUS"
30#define ACPI_BUS_DEVICE_NAME "System Bus"
31
32#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))
33
34static const char *dummy_hid = "device";
35
36static LIST_HEAD(acpi_dep_list);
37static DEFINE_MUTEX(acpi_dep_list_lock);
38LIST_HEAD(acpi_bus_id_list);
39static DEFINE_MUTEX(acpi_scan_lock);
40static LIST_HEAD(acpi_scan_handlers_list);
41DEFINE_MUTEX(acpi_device_lock);
42LIST_HEAD(acpi_wakeup_device_list);
43static DEFINE_MUTEX(acpi_hp_context_lock);
44
45/*
46 * The UART device described by the SPCR table is the only object which needs
47 * special-casing. Everything else is covered by ACPI namespace paths in STAO
48 * table.
49 */
50static u64 spcr_uart_addr;
51
52void acpi_scan_lock_acquire(void)
53{
54 mutex_lock(&acpi_scan_lock);
55}
56EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57
58void acpi_scan_lock_release(void)
59{
60 mutex_unlock(&acpi_scan_lock);
61}
62EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63
64void acpi_lock_hp_context(void)
65{
66 mutex_lock(&acpi_hp_context_lock);
67}
68
69void acpi_unlock_hp_context(void)
70{
71 mutex_unlock(&acpi_hp_context_lock);
72}
73
74void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
78{
79 acpi_lock_hp_context();
80 hp->notify = notify;
81 hp->uevent = uevent;
82 acpi_set_hp_context(adev, hp);
83 acpi_unlock_hp_context();
84}
85EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
86
87int acpi_scan_add_handler(struct acpi_scan_handler *handler)
88{
89 if (!handler)
90 return -EINVAL;
91
92 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
93 return 0;
94}
95
96int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
97 const char *hotplug_profile_name)
98{
99 int error;
100
101 error = acpi_scan_add_handler(handler);
102 if (error)
103 return error;
104
105 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
106 return 0;
107}
108
109bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
110{
111 struct acpi_device_physical_node *pn;
112 bool offline = true;
113 char *envp[] = { "EVENT=offline", NULL };
114
115 /*
116 * acpi_container_offline() calls this for all of the container's
117 * children under the container's physical_node_lock lock.
118 */
119 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
120
121 list_for_each_entry(pn, &adev->physical_node_list, node)
122 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
123 if (uevent)
124 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
125
126 offline = false;
127 break;
128 }
129
130 mutex_unlock(&adev->physical_node_lock);
131 return offline;
132}
133
134static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
135 void **ret_p)
136{
137 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
138 struct acpi_device_physical_node *pn;
139 bool second_pass = (bool)data;
140 acpi_status status = AE_OK;
141
142 if (!device)
143 return AE_OK;
144
145 if (device->handler && !device->handler->hotplug.enabled) {
146 *ret_p = &device->dev;
147 return AE_SUPPORT;
148 }
149
150 mutex_lock(&device->physical_node_lock);
151
152 list_for_each_entry(pn, &device->physical_node_list, node) {
153 int ret;
154
155 if (second_pass) {
156 /* Skip devices offlined by the first pass. */
157 if (pn->put_online)
158 continue;
159 } else {
160 pn->put_online = false;
161 }
162 ret = device_offline(pn->dev);
163 if (ret >= 0) {
164 pn->put_online = !ret;
165 } else {
166 *ret_p = pn->dev;
167 if (second_pass) {
168 status = AE_ERROR;
169 break;
170 }
171 }
172 }
173
174 mutex_unlock(&device->physical_node_lock);
175
176 return status;
177}
178
179static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
180 void **ret_p)
181{
182 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
183 struct acpi_device_physical_node *pn;
184
185 if (!device)
186 return AE_OK;
187
188 mutex_lock(&device->physical_node_lock);
189
190 list_for_each_entry(pn, &device->physical_node_list, node)
191 if (pn->put_online) {
192 device_online(pn->dev);
193 pn->put_online = false;
194 }
195
196 mutex_unlock(&device->physical_node_lock);
197
198 return AE_OK;
199}
200
201static int acpi_scan_try_to_offline(struct acpi_device *device)
202{
203 acpi_handle handle = device->handle;
204 struct device *errdev = NULL;
205 acpi_status status;
206
207 /*
208 * Carry out two passes here and ignore errors in the first pass,
209 * because if the devices in question are memory blocks and
210 * CONFIG_MEMCG is set, one of the blocks may hold data structures
211 * that the other blocks depend on, but it is not known in advance which
212 * block holds them.
213 *
214 * If the first pass is successful, the second one isn't needed, though.
215 */
216 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
217 NULL, acpi_bus_offline, (void *)false,
218 (void **)&errdev);
219 if (status == AE_SUPPORT) {
220 dev_warn(errdev, "Offline disabled.\n");
221 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
222 acpi_bus_online, NULL, NULL, NULL);
223 return -EPERM;
224 }
225 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
226 if (errdev) {
227 errdev = NULL;
228 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
229 NULL, acpi_bus_offline, (void *)true,
230 (void **)&errdev);
231 if (!errdev)
232 acpi_bus_offline(handle, 0, (void *)true,
233 (void **)&errdev);
234
235 if (errdev) {
236 dev_warn(errdev, "Offline failed.\n");
237 acpi_bus_online(handle, 0, NULL, NULL);
238 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
239 ACPI_UINT32_MAX, acpi_bus_online,
240 NULL, NULL, NULL);
241 return -EBUSY;
242 }
243 }
244 return 0;
245}
246
247static int acpi_scan_hot_remove(struct acpi_device *device)
248{
249 acpi_handle handle = device->handle;
250 unsigned long long sta;
251 acpi_status status;
252
253 if (device->handler && device->handler->hotplug.demand_offline) {
254 if (!acpi_scan_is_offline(device, true))
255 return -EBUSY;
256 } else {
257 int error = acpi_scan_try_to_offline(device);
258 if (error)
259 return error;
260 }
261
262 acpi_handle_debug(handle, "Ejecting\n");
263
264 acpi_bus_trim(device);
265
266 acpi_evaluate_lck(handle, 0);
267 /*
268 * TBD: _EJD support.
269 */
270 status = acpi_evaluate_ej0(handle);
271 if (status == AE_NOT_FOUND)
272 return -ENODEV;
273 else if (ACPI_FAILURE(status))
274 return -EIO;
275
276 /*
277 * Verify if eject was indeed successful. If not, log an error
278 * message. No need to call _OST since _EJ0 call was made OK.
279 */
280 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
281 if (ACPI_FAILURE(status)) {
282 acpi_handle_warn(handle,
283 "Status check after eject failed (0x%x)\n", status);
284 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
285 acpi_handle_warn(handle,
286 "Eject incomplete - status 0x%llx\n", sta);
287 }
288
289 return 0;
290}
291
292static int acpi_scan_device_not_enumerated(struct acpi_device *adev)
293{
294 if (!acpi_device_enumerated(adev)) {
295 dev_warn(&adev->dev, "Still not enumerated\n");
296 return -EALREADY;
297 }
298 acpi_bus_trim(adev);
299 return 0;
300}
301
302static int acpi_scan_device_check(struct acpi_device *adev)
303{
304 int error;
305
306 acpi_bus_get_status(adev);
307 if (acpi_device_is_present(adev)) {
308 /*
309 * This function is only called for device objects for which
310 * matching scan handlers exist. The only situation in which
311 * the scan handler is not attached to this device object yet
312 * is when the device has just appeared (either it wasn't
313 * present at all before or it was removed and then added
314 * again).
315 */
316 if (adev->handler) {
317 dev_warn(&adev->dev, "Already enumerated\n");
318 return -EALREADY;
319 }
320 error = acpi_bus_scan(adev->handle);
321 if (error) {
322 dev_warn(&adev->dev, "Namespace scan failure\n");
323 return error;
324 }
325 if (!adev->handler) {
326 dev_warn(&adev->dev, "Enumeration failure\n");
327 error = -ENODEV;
328 }
329 } else {
330 error = acpi_scan_device_not_enumerated(adev);
331 }
332 return error;
333}
334
335static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
336{
337 struct acpi_scan_handler *handler = adev->handler;
338 int error;
339
340 acpi_bus_get_status(adev);
341 if (!acpi_device_is_present(adev)) {
342 acpi_scan_device_not_enumerated(adev);
343 return 0;
344 }
345 if (handler && handler->hotplug.scan_dependent)
346 return handler->hotplug.scan_dependent(adev);
347
348 error = acpi_bus_scan(adev->handle);
349 if (error) {
350 dev_warn(&adev->dev, "Namespace scan failure\n");
351 return error;
352 }
353 return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
354}
355
356static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
357{
358 switch (type) {
359 case ACPI_NOTIFY_BUS_CHECK:
360 return acpi_scan_bus_check(adev, NULL);
361 case ACPI_NOTIFY_DEVICE_CHECK:
362 return acpi_scan_device_check(adev);
363 case ACPI_NOTIFY_EJECT_REQUEST:
364 case ACPI_OST_EC_OSPM_EJECT:
365 if (adev->handler && !adev->handler->hotplug.enabled) {
366 dev_info(&adev->dev, "Eject disabled\n");
367 return -EPERM;
368 }
369 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
370 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
371 return acpi_scan_hot_remove(adev);
372 }
373 return -EINVAL;
374}
375
376void acpi_device_hotplug(struct acpi_device *adev, u32 src)
377{
378 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
379 int error = -ENODEV;
380
381 lock_device_hotplug();
382 mutex_lock(&acpi_scan_lock);
383
384 /*
385 * The device object's ACPI handle cannot become invalid as long as we
386 * are holding acpi_scan_lock, but it might have become invalid before
387 * that lock was acquired.
388 */
389 if (adev->handle == INVALID_ACPI_HANDLE)
390 goto err_out;
391
392 if (adev->flags.is_dock_station) {
393 error = dock_notify(adev, src);
394 } else if (adev->flags.hotplug_notify) {
395 error = acpi_generic_hotplug_event(adev, src);
396 } else {
397 int (*notify)(struct acpi_device *, u32);
398
399 acpi_lock_hp_context();
400 notify = adev->hp ? adev->hp->notify : NULL;
401 acpi_unlock_hp_context();
402 /*
403 * There may be additional notify handlers for device objects
404 * without the .event() callback, so ignore them here.
405 */
406 if (notify)
407 error = notify(adev, src);
408 else
409 goto out;
410 }
411 switch (error) {
412 case 0:
413 ost_code = ACPI_OST_SC_SUCCESS;
414 break;
415 case -EPERM:
416 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
417 break;
418 case -EBUSY:
419 ost_code = ACPI_OST_SC_DEVICE_BUSY;
420 break;
421 default:
422 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
423 break;
424 }
425
426 err_out:
427 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
428
429 out:
430 acpi_put_acpi_dev(adev);
431 mutex_unlock(&acpi_scan_lock);
432 unlock_device_hotplug();
433}
434
435static void acpi_free_power_resources_lists(struct acpi_device *device)
436{
437 int i;
438
439 if (device->wakeup.flags.valid)
440 acpi_power_resources_list_free(&device->wakeup.resources);
441
442 if (!device->power.flags.power_resources)
443 return;
444
445 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
446 struct acpi_device_power_state *ps = &device->power.states[i];
447 acpi_power_resources_list_free(&ps->resources);
448 }
449}
450
451static void acpi_device_release(struct device *dev)
452{
453 struct acpi_device *acpi_dev = to_acpi_device(dev);
454
455 acpi_free_properties(acpi_dev);
456 acpi_free_pnp_ids(&acpi_dev->pnp);
457 acpi_free_power_resources_lists(acpi_dev);
458 kfree(acpi_dev);
459}
460
461static void acpi_device_del(struct acpi_device *device)
462{
463 struct acpi_device_bus_id *acpi_device_bus_id;
464
465 mutex_lock(&acpi_device_lock);
466
467 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
468 if (!strcmp(acpi_device_bus_id->bus_id,
469 acpi_device_hid(device))) {
470 ida_free(&acpi_device_bus_id->instance_ida,
471 device->pnp.instance_no);
472 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
473 list_del(&acpi_device_bus_id->node);
474 kfree_const(acpi_device_bus_id->bus_id);
475 kfree(acpi_device_bus_id);
476 }
477 break;
478 }
479
480 list_del(&device->wakeup_list);
481
482 mutex_unlock(&acpi_device_lock);
483
484 acpi_power_add_remove_device(device, false);
485 acpi_device_remove_files(device);
486 if (device->remove)
487 device->remove(device);
488
489 device_del(&device->dev);
490}
491
492static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
493
494static LIST_HEAD(acpi_device_del_list);
495static DEFINE_MUTEX(acpi_device_del_lock);
496
497static void acpi_device_del_work_fn(struct work_struct *work_not_used)
498{
499 for (;;) {
500 struct acpi_device *adev;
501
502 mutex_lock(&acpi_device_del_lock);
503
504 if (list_empty(&acpi_device_del_list)) {
505 mutex_unlock(&acpi_device_del_lock);
506 break;
507 }
508 adev = list_first_entry(&acpi_device_del_list,
509 struct acpi_device, del_list);
510 list_del(&adev->del_list);
511
512 mutex_unlock(&acpi_device_del_lock);
513
514 blocking_notifier_call_chain(&acpi_reconfig_chain,
515 ACPI_RECONFIG_DEVICE_REMOVE, adev);
516
517 acpi_device_del(adev);
518 /*
519 * Drop references to all power resources that might have been
520 * used by the device.
521 */
522 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
523 acpi_dev_put(adev);
524 }
525}
526
527/**
528 * acpi_scan_drop_device - Drop an ACPI device object.
529 * @handle: Handle of an ACPI namespace node, not used.
530 * @context: Address of the ACPI device object to drop.
531 *
532 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
533 * namespace node the device object pointed to by @context is attached to.
534 *
535 * The unregistration is carried out asynchronously to avoid running
536 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
537 * ensure the correct ordering (the device objects must be unregistered in the
538 * same order in which the corresponding namespace nodes are deleted).
539 */
540static void acpi_scan_drop_device(acpi_handle handle, void *context)
541{
542 static DECLARE_WORK(work, acpi_device_del_work_fn);
543 struct acpi_device *adev = context;
544
545 mutex_lock(&acpi_device_del_lock);
546
547 /*
548 * Use the ACPI hotplug workqueue which is ordered, so this work item
549 * won't run after any hotplug work items submitted subsequently. That
550 * prevents attempts to register device objects identical to those being
551 * deleted from happening concurrently (such attempts result from
552 * hotplug events handled via the ACPI hotplug workqueue). It also will
553 * run after all of the work items submitted previously, which helps
554 * those work items to ensure that they are not accessing stale device
555 * objects.
556 */
557 if (list_empty(&acpi_device_del_list))
558 acpi_queue_hotplug_work(&work);
559
560 list_add_tail(&adev->del_list, &acpi_device_del_list);
561 /* Make acpi_ns_validate_handle() return NULL for this handle. */
562 adev->handle = INVALID_ACPI_HANDLE;
563
564 mutex_unlock(&acpi_device_del_lock);
565}
566
567static struct acpi_device *handle_to_device(acpi_handle handle,
568 void (*callback)(void *))
569{
570 struct acpi_device *adev = NULL;
571 acpi_status status;
572
573 status = acpi_get_data_full(handle, acpi_scan_drop_device,
574 (void **)&adev, callback);
575 if (ACPI_FAILURE(status) || !adev) {
576 acpi_handle_debug(handle, "No context!\n");
577 return NULL;
578 }
579 return adev;
580}
581
582/**
583 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
584 * @handle: ACPI handle associated with the requested ACPI device object.
585 *
586 * Return a pointer to the ACPI device object associated with @handle, if
587 * present, or NULL otherwise.
588 */
589struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
590{
591 return handle_to_device(handle, NULL);
592}
593EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
594
595static void get_acpi_device(void *dev)
596{
597 acpi_dev_get(dev);
598}
599
600/**
601 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
602 * @handle: ACPI handle associated with the requested ACPI device object.
603 *
604 * Return a pointer to the ACPI device object associated with @handle and bump
605 * up that object's reference counter (under the ACPI Namespace lock), if
606 * present, or return NULL otherwise.
607 *
608 * The ACPI device object reference acquired by this function needs to be
609 * dropped via acpi_dev_put().
610 */
611struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
612{
613 return handle_to_device(handle, get_acpi_device);
614}
615EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
616
617static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
618{
619 struct acpi_device_bus_id *acpi_device_bus_id;
620
621 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
622 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
623 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
624 return acpi_device_bus_id;
625 }
626 return NULL;
627}
628
629static int acpi_device_set_name(struct acpi_device *device,
630 struct acpi_device_bus_id *acpi_device_bus_id)
631{
632 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
633 int result;
634
635 result = ida_alloc(instance_ida, GFP_KERNEL);
636 if (result < 0)
637 return result;
638
639 device->pnp.instance_no = result;
640 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
641 return 0;
642}
643
644int acpi_tie_acpi_dev(struct acpi_device *adev)
645{
646 acpi_handle handle = adev->handle;
647 acpi_status status;
648
649 if (!handle)
650 return 0;
651
652 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
653 if (ACPI_FAILURE(status)) {
654 acpi_handle_err(handle, "Unable to attach device data\n");
655 return -ENODEV;
656 }
657
658 return 0;
659}
660
661static void acpi_store_pld_crc(struct acpi_device *adev)
662{
663 struct acpi_pld_info *pld;
664 acpi_status status;
665
666 status = acpi_get_physical_device_location(adev->handle, &pld);
667 if (ACPI_FAILURE(status))
668 return;
669
670 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
671 ACPI_FREE(pld);
672}
673
674int acpi_device_add(struct acpi_device *device)
675{
676 struct acpi_device_bus_id *acpi_device_bus_id;
677 int result;
678
679 /*
680 * Linkage
681 * -------
682 * Link this device to its parent and siblings.
683 */
684 INIT_LIST_HEAD(&device->wakeup_list);
685 INIT_LIST_HEAD(&device->physical_node_list);
686 INIT_LIST_HEAD(&device->del_list);
687 mutex_init(&device->physical_node_lock);
688
689 mutex_lock(&acpi_device_lock);
690
691 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
692 if (acpi_device_bus_id) {
693 result = acpi_device_set_name(device, acpi_device_bus_id);
694 if (result)
695 goto err_unlock;
696 } else {
697 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
698 GFP_KERNEL);
699 if (!acpi_device_bus_id) {
700 result = -ENOMEM;
701 goto err_unlock;
702 }
703 acpi_device_bus_id->bus_id =
704 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
705 if (!acpi_device_bus_id->bus_id) {
706 kfree(acpi_device_bus_id);
707 result = -ENOMEM;
708 goto err_unlock;
709 }
710
711 ida_init(&acpi_device_bus_id->instance_ida);
712
713 result = acpi_device_set_name(device, acpi_device_bus_id);
714 if (result) {
715 kfree_const(acpi_device_bus_id->bus_id);
716 kfree(acpi_device_bus_id);
717 goto err_unlock;
718 }
719
720 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
721 }
722
723 if (device->wakeup.flags.valid)
724 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
725
726 acpi_store_pld_crc(device);
727
728 mutex_unlock(&acpi_device_lock);
729
730 result = device_add(&device->dev);
731 if (result) {
732 dev_err(&device->dev, "Error registering device\n");
733 goto err;
734 }
735
736 result = acpi_device_setup_files(device);
737 if (result)
738 pr_err("Error creating sysfs interface for device %s\n",
739 dev_name(&device->dev));
740
741 return 0;
742
743err:
744 mutex_lock(&acpi_device_lock);
745
746 list_del(&device->wakeup_list);
747
748err_unlock:
749 mutex_unlock(&acpi_device_lock);
750
751 acpi_detach_data(device->handle, acpi_scan_drop_device);
752
753 return result;
754}
755
756/* --------------------------------------------------------------------------
757 Device Enumeration
758 -------------------------------------------------------------------------- */
759static bool acpi_info_matches_ids(struct acpi_device_info *info,
760 const char * const ids[])
761{
762 struct acpi_pnp_device_id_list *cid_list = NULL;
763 int i, index;
764
765 if (!(info->valid & ACPI_VALID_HID))
766 return false;
767
768 index = match_string(ids, -1, info->hardware_id.string);
769 if (index >= 0)
770 return true;
771
772 if (info->valid & ACPI_VALID_CID)
773 cid_list = &info->compatible_id_list;
774
775 if (!cid_list)
776 return false;
777
778 for (i = 0; i < cid_list->count; i++) {
779 index = match_string(ids, -1, cid_list->ids[i].string);
780 if (index >= 0)
781 return true;
782 }
783
784 return false;
785}
786
787/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
788static const char * const acpi_ignore_dep_ids[] = {
789 "PNP0D80", /* Windows-compatible System Power Management Controller */
790 "INT33BD", /* Intel Baytrail Mailbox Device */
791 "LATT2021", /* Lattice FW Update Client Driver */
792 NULL
793};
794
795/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
796static const char * const acpi_honor_dep_ids[] = {
797 "INT3472", /* Camera sensor PMIC / clk and regulator info */
798 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
799 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
800 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
801 NULL
802};
803
804static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
805{
806 struct acpi_device *adev;
807
808 /*
809 * Fixed hardware devices do not appear in the namespace and do not
810 * have handles, but we fabricate acpi_devices for them, so we have
811 * to deal with them specially.
812 */
813 if (!handle)
814 return acpi_root;
815
816 do {
817 acpi_status status;
818
819 status = acpi_get_parent(handle, &handle);
820 if (ACPI_FAILURE(status)) {
821 if (status != AE_NULL_ENTRY)
822 return acpi_root;
823
824 return NULL;
825 }
826 adev = acpi_fetch_acpi_dev(handle);
827 } while (!adev);
828 return adev;
829}
830
831acpi_status
832acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
833{
834 acpi_status status;
835 acpi_handle tmp;
836 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
837 union acpi_object *obj;
838
839 status = acpi_get_handle(handle, "_EJD", &tmp);
840 if (ACPI_FAILURE(status))
841 return status;
842
843 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
844 if (ACPI_SUCCESS(status)) {
845 obj = buffer.pointer;
846 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
847 ejd);
848 kfree(buffer.pointer);
849 }
850 return status;
851}
852EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
853
854static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
855{
856 acpi_handle handle = dev->handle;
857 struct acpi_device_wakeup *wakeup = &dev->wakeup;
858 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
859 union acpi_object *package = NULL;
860 union acpi_object *element = NULL;
861 acpi_status status;
862 int err = -ENODATA;
863
864 INIT_LIST_HEAD(&wakeup->resources);
865
866 /* _PRW */
867 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
868 if (ACPI_FAILURE(status)) {
869 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
870 acpi_format_exception(status));
871 return err;
872 }
873
874 package = (union acpi_object *)buffer.pointer;
875
876 if (!package || package->package.count < 2)
877 goto out;
878
879 element = &(package->package.elements[0]);
880 if (!element)
881 goto out;
882
883 if (element->type == ACPI_TYPE_PACKAGE) {
884 if ((element->package.count < 2) ||
885 (element->package.elements[0].type !=
886 ACPI_TYPE_LOCAL_REFERENCE)
887 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
888 goto out;
889
890 wakeup->gpe_device =
891 element->package.elements[0].reference.handle;
892 wakeup->gpe_number =
893 (u32) element->package.elements[1].integer.value;
894 } else if (element->type == ACPI_TYPE_INTEGER) {
895 wakeup->gpe_device = NULL;
896 wakeup->gpe_number = element->integer.value;
897 } else {
898 goto out;
899 }
900
901 element = &(package->package.elements[1]);
902 if (element->type != ACPI_TYPE_INTEGER)
903 goto out;
904
905 wakeup->sleep_state = element->integer.value;
906
907 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
908 if (err)
909 goto out;
910
911 if (!list_empty(&wakeup->resources)) {
912 int sleep_state;
913
914 err = acpi_power_wakeup_list_init(&wakeup->resources,
915 &sleep_state);
916 if (err) {
917 acpi_handle_warn(handle, "Retrieving current states "
918 "of wakeup power resources failed\n");
919 acpi_power_resources_list_free(&wakeup->resources);
920 goto out;
921 }
922 if (sleep_state < wakeup->sleep_state) {
923 acpi_handle_warn(handle, "Overriding _PRW sleep state "
924 "(S%d) by S%d from power resources\n",
925 (int)wakeup->sleep_state, sleep_state);
926 wakeup->sleep_state = sleep_state;
927 }
928 }
929
930 out:
931 kfree(buffer.pointer);
932 return err;
933}
934
935/* Do not use a button for S5 wakeup */
936#define ACPI_AVOID_WAKE_FROM_S5 BIT(0)
937
938static bool acpi_wakeup_gpe_init(struct acpi_device *device)
939{
940 static const struct acpi_device_id button_device_ids[] = {
941 {"PNP0C0C", 0}, /* Power button */
942 {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */
943 {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */
944 {"", 0},
945 };
946 struct acpi_device_wakeup *wakeup = &device->wakeup;
947 const struct acpi_device_id *match;
948 acpi_status status;
949
950 wakeup->flags.notifier_present = 0;
951
952 /* Power button, Lid switch always enable wakeup */
953 match = acpi_match_acpi_device(button_device_ids, device);
954 if (match) {
955 if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&
956 wakeup->sleep_state == ACPI_STATE_S5)
957 wakeup->sleep_state = ACPI_STATE_S4;
958 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
959 device_set_wakeup_capable(&device->dev, true);
960 return true;
961 }
962
963 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
964 wakeup->gpe_number);
965 return ACPI_SUCCESS(status);
966}
967
968static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
969{
970 int err;
971
972 /* Presence of _PRW indicates wake capable */
973 if (!acpi_has_method(device->handle, "_PRW"))
974 return;
975
976 err = acpi_bus_extract_wakeup_device_power_package(device);
977 if (err) {
978 dev_err(&device->dev, "Unable to extract wakeup power resources");
979 return;
980 }
981
982 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
983 device->wakeup.prepare_count = 0;
984 /*
985 * Call _PSW/_DSW object to disable its ability to wake the sleeping
986 * system for the ACPI device with the _PRW object.
987 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
988 * So it is necessary to call _DSW object first. Only when it is not
989 * present will the _PSW object used.
990 */
991 err = acpi_device_sleep_wake(device, 0, 0, 0);
992 if (err)
993 pr_debug("error in _DSW or _PSW evaluation\n");
994}
995
996static void acpi_bus_init_power_state(struct acpi_device *device, int state)
997{
998 struct acpi_device_power_state *ps = &device->power.states[state];
999 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1000 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1001 acpi_status status;
1002
1003 INIT_LIST_HEAD(&ps->resources);
1004
1005 /* Evaluate "_PRx" to get referenced power resources */
1006 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1007 if (ACPI_SUCCESS(status)) {
1008 union acpi_object *package = buffer.pointer;
1009
1010 if (buffer.length && package
1011 && package->type == ACPI_TYPE_PACKAGE
1012 && package->package.count)
1013 acpi_extract_power_resources(package, 0, &ps->resources);
1014
1015 ACPI_FREE(buffer.pointer);
1016 }
1017
1018 /* Evaluate "_PSx" to see if we can do explicit sets */
1019 pathname[2] = 'S';
1020 if (acpi_has_method(device->handle, pathname))
1021 ps->flags.explicit_set = 1;
1022
1023 /* State is valid if there are means to put the device into it. */
1024 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1025 ps->flags.valid = 1;
1026
1027 ps->power = -1; /* Unknown - driver assigned */
1028 ps->latency = -1; /* Unknown - driver assigned */
1029}
1030
1031static void acpi_bus_get_power_flags(struct acpi_device *device)
1032{
1033 unsigned long long dsc = ACPI_STATE_D0;
1034 u32 i;
1035
1036 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1037 if (!acpi_has_method(device->handle, "_PS0") &&
1038 !acpi_has_method(device->handle, "_PR0"))
1039 return;
1040
1041 device->flags.power_manageable = 1;
1042
1043 /*
1044 * Power Management Flags
1045 */
1046 if (acpi_has_method(device->handle, "_PSC"))
1047 device->power.flags.explicit_get = 1;
1048
1049 if (acpi_has_method(device->handle, "_IRC"))
1050 device->power.flags.inrush_current = 1;
1051
1052 if (acpi_has_method(device->handle, "_DSW"))
1053 device->power.flags.dsw_present = 1;
1054
1055 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1056 device->power.state_for_enumeration = dsc;
1057
1058 /*
1059 * Enumerate supported power management states
1060 */
1061 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1062 acpi_bus_init_power_state(device, i);
1063
1064 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1065
1066 /* Set the defaults for D0 and D3hot (always supported). */
1067 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1068 device->power.states[ACPI_STATE_D0].power = 100;
1069 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1070
1071 /*
1072 * Use power resources only if the D0 list of them is populated, because
1073 * some platforms may provide _PR3 only to indicate D3cold support and
1074 * in those cases the power resources list returned by it may be bogus.
1075 */
1076 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1077 device->power.flags.power_resources = 1;
1078 /*
1079 * D3cold is supported if the D3hot list of power resources is
1080 * not empty.
1081 */
1082 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1083 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1084 }
1085
1086 if (acpi_bus_init_power(device))
1087 device->flags.power_manageable = 0;
1088}
1089
1090static void acpi_bus_get_flags(struct acpi_device *device)
1091{
1092 /* Presence of _STA indicates 'dynamic_status' */
1093 if (acpi_has_method(device->handle, "_STA"))
1094 device->flags.dynamic_status = 1;
1095
1096 /* Presence of _RMV indicates 'removable' */
1097 if (acpi_has_method(device->handle, "_RMV"))
1098 device->flags.removable = 1;
1099
1100 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1101 if (acpi_has_method(device->handle, "_EJD") ||
1102 acpi_has_method(device->handle, "_EJ0"))
1103 device->flags.ejectable = 1;
1104}
1105
1106static void acpi_device_get_busid(struct acpi_device *device)
1107{
1108 char bus_id[5] = { '?', 0 };
1109 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1110 int i = 0;
1111
1112 /*
1113 * Bus ID
1114 * ------
1115 * The device's Bus ID is simply the object name.
1116 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1117 */
1118 if (!acpi_dev_parent(device)) {
1119 strcpy(device->pnp.bus_id, "ACPI");
1120 return;
1121 }
1122
1123 switch (device->device_type) {
1124 case ACPI_BUS_TYPE_POWER_BUTTON:
1125 strcpy(device->pnp.bus_id, "PWRF");
1126 break;
1127 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1128 strcpy(device->pnp.bus_id, "SLPF");
1129 break;
1130 case ACPI_BUS_TYPE_ECDT_EC:
1131 strcpy(device->pnp.bus_id, "ECDT");
1132 break;
1133 default:
1134 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1135 /* Clean up trailing underscores (if any) */
1136 for (i = 3; i > 1; i--) {
1137 if (bus_id[i] == '_')
1138 bus_id[i] = '\0';
1139 else
1140 break;
1141 }
1142 strcpy(device->pnp.bus_id, bus_id);
1143 break;
1144 }
1145}
1146
1147/*
1148 * acpi_ata_match - see if an acpi object is an ATA device
1149 *
1150 * If an acpi object has one of the ACPI ATA methods defined,
1151 * then we can safely call it an ATA device.
1152 */
1153bool acpi_ata_match(acpi_handle handle)
1154{
1155 return acpi_has_method(handle, "_GTF") ||
1156 acpi_has_method(handle, "_GTM") ||
1157 acpi_has_method(handle, "_STM") ||
1158 acpi_has_method(handle, "_SDD");
1159}
1160
1161/*
1162 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1163 *
1164 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1165 * then we can safely call it an ejectable drive bay
1166 */
1167bool acpi_bay_match(acpi_handle handle)
1168{
1169 acpi_handle phandle;
1170
1171 if (!acpi_has_method(handle, "_EJ0"))
1172 return false;
1173 if (acpi_ata_match(handle))
1174 return true;
1175 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1176 return false;
1177
1178 return acpi_ata_match(phandle);
1179}
1180
1181bool acpi_device_is_battery(struct acpi_device *adev)
1182{
1183 struct acpi_hardware_id *hwid;
1184
1185 list_for_each_entry(hwid, &adev->pnp.ids, list)
1186 if (!strcmp("PNP0C0A", hwid->id))
1187 return true;
1188
1189 return false;
1190}
1191
1192static bool is_ejectable_bay(struct acpi_device *adev)
1193{
1194 acpi_handle handle = adev->handle;
1195
1196 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1197 return true;
1198
1199 return acpi_bay_match(handle);
1200}
1201
1202/*
1203 * acpi_dock_match - see if an acpi object has a _DCK method
1204 */
1205bool acpi_dock_match(acpi_handle handle)
1206{
1207 return acpi_has_method(handle, "_DCK");
1208}
1209
1210static acpi_status
1211acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1212 void **return_value)
1213{
1214 long *cap = context;
1215
1216 if (acpi_has_method(handle, "_BCM") &&
1217 acpi_has_method(handle, "_BCL")) {
1218 acpi_handle_debug(handle, "Found generic backlight support\n");
1219 *cap |= ACPI_VIDEO_BACKLIGHT;
1220 /* We have backlight support, no need to scan further */
1221 return AE_CTRL_TERMINATE;
1222 }
1223 return 0;
1224}
1225
1226/* Returns true if the ACPI object is a video device which can be
1227 * handled by video.ko.
1228 * The device will get a Linux specific CID added in scan.c to
1229 * identify the device as an ACPI graphics device
1230 * Be aware that the graphics device may not be physically present
1231 * Use acpi_video_get_capabilities() to detect general ACPI video
1232 * capabilities of present cards
1233 */
1234long acpi_is_video_device(acpi_handle handle)
1235{
1236 long video_caps = 0;
1237
1238 /* Is this device able to support video switching ? */
1239 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1240 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1241
1242 /* Is this device able to retrieve a video ROM ? */
1243 if (acpi_has_method(handle, "_ROM"))
1244 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1245
1246 /* Is this device able to configure which video head to be POSTed ? */
1247 if (acpi_has_method(handle, "_VPO") &&
1248 acpi_has_method(handle, "_GPD") &&
1249 acpi_has_method(handle, "_SPD"))
1250 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1251
1252 /* Only check for backlight functionality if one of the above hit. */
1253 if (video_caps)
1254 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1255 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1256 &video_caps, NULL);
1257
1258 return video_caps;
1259}
1260EXPORT_SYMBOL(acpi_is_video_device);
1261
1262const char *acpi_device_hid(struct acpi_device *device)
1263{
1264 struct acpi_hardware_id *hid;
1265
1266 if (list_empty(&device->pnp.ids))
1267 return dummy_hid;
1268
1269 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1270 return hid->id;
1271}
1272EXPORT_SYMBOL(acpi_device_hid);
1273
1274static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1275{
1276 struct acpi_hardware_id *id;
1277
1278 id = kmalloc(sizeof(*id), GFP_KERNEL);
1279 if (!id)
1280 return;
1281
1282 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1283 if (!id->id) {
1284 kfree(id);
1285 return;
1286 }
1287
1288 list_add_tail(&id->list, &pnp->ids);
1289 pnp->type.hardware_id = 1;
1290}
1291
1292/*
1293 * Old IBM workstations have a DSDT bug wherein the SMBus object
1294 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1295 * prefix. Work around this.
1296 */
1297static bool acpi_ibm_smbus_match(acpi_handle handle)
1298{
1299 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1300 struct acpi_buffer path = { sizeof(node_name), node_name };
1301
1302 if (!dmi_name_in_vendors("IBM"))
1303 return false;
1304
1305 /* Look for SMBS object */
1306 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1307 strcmp("SMBS", path.pointer))
1308 return false;
1309
1310 /* Does it have the necessary (but misnamed) methods? */
1311 if (acpi_has_method(handle, "SBI") &&
1312 acpi_has_method(handle, "SBR") &&
1313 acpi_has_method(handle, "SBW"))
1314 return true;
1315
1316 return false;
1317}
1318
1319static bool acpi_object_is_system_bus(acpi_handle handle)
1320{
1321 acpi_handle tmp;
1322
1323 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1324 tmp == handle)
1325 return true;
1326 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1327 tmp == handle)
1328 return true;
1329
1330 return false;
1331}
1332
1333static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1334 int device_type)
1335{
1336 struct acpi_device_info *info = NULL;
1337 struct acpi_pnp_device_id_list *cid_list;
1338 int i;
1339
1340 switch (device_type) {
1341 case ACPI_BUS_TYPE_DEVICE:
1342 if (handle == ACPI_ROOT_OBJECT) {
1343 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1344 break;
1345 }
1346
1347 acpi_get_object_info(handle, &info);
1348 if (!info) {
1349 pr_err("%s: Error reading device info\n", __func__);
1350 return;
1351 }
1352
1353 if (info->valid & ACPI_VALID_HID) {
1354 acpi_add_id(pnp, info->hardware_id.string);
1355 pnp->type.platform_id = 1;
1356 }
1357 if (info->valid & ACPI_VALID_CID) {
1358 cid_list = &info->compatible_id_list;
1359 for (i = 0; i < cid_list->count; i++)
1360 acpi_add_id(pnp, cid_list->ids[i].string);
1361 }
1362 if (info->valid & ACPI_VALID_ADR) {
1363 pnp->bus_address = info->address;
1364 pnp->type.bus_address = 1;
1365 }
1366 if (info->valid & ACPI_VALID_UID)
1367 pnp->unique_id = kstrdup(info->unique_id.string,
1368 GFP_KERNEL);
1369 if (info->valid & ACPI_VALID_CLS)
1370 acpi_add_id(pnp, info->class_code.string);
1371
1372 kfree(info);
1373
1374 /*
1375 * Some devices don't reliably have _HIDs & _CIDs, so add
1376 * synthetic HIDs to make sure drivers can find them.
1377 */
1378 if (acpi_is_video_device(handle)) {
1379 acpi_add_id(pnp, ACPI_VIDEO_HID);
1380 pnp->type.backlight = 1;
1381 break;
1382 }
1383 if (acpi_bay_match(handle))
1384 acpi_add_id(pnp, ACPI_BAY_HID);
1385 else if (acpi_dock_match(handle))
1386 acpi_add_id(pnp, ACPI_DOCK_HID);
1387 else if (acpi_ibm_smbus_match(handle))
1388 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1389 else if (list_empty(&pnp->ids) &&
1390 acpi_object_is_system_bus(handle)) {
1391 /* \_SB, \_TZ, LNXSYBUS */
1392 acpi_add_id(pnp, ACPI_BUS_HID);
1393 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1394 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1395 }
1396
1397 break;
1398 case ACPI_BUS_TYPE_POWER:
1399 acpi_add_id(pnp, ACPI_POWER_HID);
1400 break;
1401 case ACPI_BUS_TYPE_PROCESSOR:
1402 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1403 break;
1404 case ACPI_BUS_TYPE_THERMAL:
1405 acpi_add_id(pnp, ACPI_THERMAL_HID);
1406 break;
1407 case ACPI_BUS_TYPE_POWER_BUTTON:
1408 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1409 break;
1410 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1411 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1412 break;
1413 case ACPI_BUS_TYPE_ECDT_EC:
1414 acpi_add_id(pnp, ACPI_ECDT_HID);
1415 break;
1416 }
1417}
1418
1419void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1420{
1421 struct acpi_hardware_id *id, *tmp;
1422
1423 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1424 kfree_const(id->id);
1425 kfree(id);
1426 }
1427 kfree(pnp->unique_id);
1428}
1429
1430/**
1431 * acpi_dma_supported - Check DMA support for the specified device.
1432 * @adev: The pointer to acpi device
1433 *
1434 * Return false if DMA is not supported. Otherwise, return true
1435 */
1436bool acpi_dma_supported(const struct acpi_device *adev)
1437{
1438 if (!adev)
1439 return false;
1440
1441 if (adev->flags.cca_seen)
1442 return true;
1443
1444 /*
1445 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1446 * DMA on "Intel platforms". Presumably that includes all x86 and
1447 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1448 */
1449 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1450 return true;
1451
1452 return false;
1453}
1454
1455/**
1456 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1457 * @adev: The pointer to acpi device
1458 *
1459 * Return enum dev_dma_attr.
1460 */
1461enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1462{
1463 if (!acpi_dma_supported(adev))
1464 return DEV_DMA_NOT_SUPPORTED;
1465
1466 if (adev->flags.coherent_dma)
1467 return DEV_DMA_COHERENT;
1468 else
1469 return DEV_DMA_NON_COHERENT;
1470}
1471
1472/**
1473 * acpi_dma_get_range() - Get device DMA parameters.
1474 *
1475 * @dev: device to configure
1476 * @map: pointer to DMA ranges result
1477 *
1478 * Evaluate DMA regions and return pointer to DMA regions on
1479 * parsing success; it does not update the passed in values on failure.
1480 *
1481 * Return 0 on success, < 0 on failure.
1482 */
1483int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1484{
1485 struct acpi_device *adev;
1486 LIST_HEAD(list);
1487 struct resource_entry *rentry;
1488 int ret;
1489 struct device *dma_dev = dev;
1490 struct bus_dma_region *r;
1491
1492 /*
1493 * Walk the device tree chasing an ACPI companion with a _DMA
1494 * object while we go. Stop if we find a device with an ACPI
1495 * companion containing a _DMA method.
1496 */
1497 do {
1498 adev = ACPI_COMPANION(dma_dev);
1499 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1500 break;
1501
1502 dma_dev = dma_dev->parent;
1503 } while (dma_dev);
1504
1505 if (!dma_dev)
1506 return -ENODEV;
1507
1508 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1509 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1510 return -EINVAL;
1511 }
1512
1513 ret = acpi_dev_get_dma_resources(adev, &list);
1514 if (ret > 0) {
1515 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1516 if (!r) {
1517 ret = -ENOMEM;
1518 goto out;
1519 }
1520
1521 *map = r;
1522
1523 list_for_each_entry(rentry, &list, node) {
1524 if (rentry->res->start >= rentry->res->end) {
1525 kfree(*map);
1526 *map = NULL;
1527 ret = -EINVAL;
1528 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1529 goto out;
1530 }
1531
1532 r->cpu_start = rentry->res->start;
1533 r->dma_start = rentry->res->start - rentry->offset;
1534 r->size = resource_size(rentry->res);
1535 r++;
1536 }
1537 }
1538 out:
1539 acpi_dev_free_resource_list(&list);
1540
1541 return ret >= 0 ? 0 : ret;
1542}
1543
1544#ifdef CONFIG_IOMMU_API
1545int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1546 struct fwnode_handle *fwnode,
1547 const struct iommu_ops *ops)
1548{
1549 int ret = iommu_fwspec_init(dev, fwnode, ops);
1550
1551 if (!ret)
1552 ret = iommu_fwspec_add_ids(dev, &id, 1);
1553
1554 return ret;
1555}
1556
1557static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1558{
1559 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1560
1561 return fwspec ? fwspec->ops : NULL;
1562}
1563
1564static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1565{
1566 int err;
1567 const struct iommu_ops *ops;
1568
1569 /* Serialise to make dev->iommu stable under our potential fwspec */
1570 mutex_lock(&iommu_probe_device_lock);
1571 /*
1572 * If we already translated the fwspec there is nothing left to do,
1573 * return the iommu_ops.
1574 */
1575 ops = acpi_iommu_fwspec_ops(dev);
1576 if (ops) {
1577 mutex_unlock(&iommu_probe_device_lock);
1578 return 0;
1579 }
1580
1581 err = iort_iommu_configure_id(dev, id_in);
1582 if (err && err != -EPROBE_DEFER)
1583 err = viot_iommu_configure(dev);
1584 mutex_unlock(&iommu_probe_device_lock);
1585
1586 /*
1587 * If we have reason to believe the IOMMU driver missed the initial
1588 * iommu_probe_device() call for dev, replay it to get things in order.
1589 */
1590 if (!err && dev->bus)
1591 err = iommu_probe_device(dev);
1592
1593 /* Ignore all other errors apart from EPROBE_DEFER */
1594 if (err == -EPROBE_DEFER) {
1595 return err;
1596 } else if (err) {
1597 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1598 return -ENODEV;
1599 }
1600 if (!acpi_iommu_fwspec_ops(dev))
1601 return -ENODEV;
1602 return 0;
1603}
1604
1605#else /* !CONFIG_IOMMU_API */
1606
1607int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1608 struct fwnode_handle *fwnode,
1609 const struct iommu_ops *ops)
1610{
1611 return -ENODEV;
1612}
1613
1614static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1615{
1616 return -ENODEV;
1617}
1618
1619#endif /* !CONFIG_IOMMU_API */
1620
1621/**
1622 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1623 * @dev: The pointer to the device
1624 * @attr: device dma attributes
1625 * @input_id: input device id const value pointer
1626 */
1627int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1628 const u32 *input_id)
1629{
1630 int ret;
1631
1632 if (attr == DEV_DMA_NOT_SUPPORTED) {
1633 set_dma_ops(dev, &dma_dummy_ops);
1634 return 0;
1635 }
1636
1637 acpi_arch_dma_setup(dev);
1638
1639 ret = acpi_iommu_configure_id(dev, input_id);
1640 if (ret == -EPROBE_DEFER)
1641 return -EPROBE_DEFER;
1642
1643 /*
1644 * Historically this routine doesn't fail driver probing due to errors
1645 * in acpi_iommu_configure_id()
1646 */
1647
1648 arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT);
1649
1650 return 0;
1651}
1652EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1653
1654static void acpi_init_coherency(struct acpi_device *adev)
1655{
1656 unsigned long long cca = 0;
1657 acpi_status status;
1658 struct acpi_device *parent = acpi_dev_parent(adev);
1659
1660 if (parent && parent->flags.cca_seen) {
1661 /*
1662 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1663 * already saw one.
1664 */
1665 adev->flags.cca_seen = 1;
1666 cca = parent->flags.coherent_dma;
1667 } else {
1668 status = acpi_evaluate_integer(adev->handle, "_CCA",
1669 NULL, &cca);
1670 if (ACPI_SUCCESS(status))
1671 adev->flags.cca_seen = 1;
1672 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1673 /*
1674 * If architecture does not specify that _CCA is
1675 * required for DMA-able devices (e.g. x86),
1676 * we default to _CCA=1.
1677 */
1678 cca = 1;
1679 else
1680 acpi_handle_debug(adev->handle,
1681 "ACPI device is missing _CCA.\n");
1682 }
1683
1684 adev->flags.coherent_dma = cca;
1685}
1686
1687static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1688{
1689 bool *is_serial_bus_slave_p = data;
1690
1691 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1692 return 1;
1693
1694 *is_serial_bus_slave_p = true;
1695
1696 /* no need to do more checking */
1697 return -1;
1698}
1699
1700static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1701{
1702 struct acpi_device *parent = acpi_dev_parent(device);
1703 static const struct acpi_device_id indirect_io_hosts[] = {
1704 {"HISI0191", 0},
1705 {}
1706 };
1707
1708 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1709}
1710
1711static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1712{
1713 struct list_head resource_list;
1714 bool is_serial_bus_slave = false;
1715 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1716 /*
1717 * These devices have multiple SerialBus resources and a client
1718 * device must be instantiated for each of them, each with
1719 * its own device id.
1720 * Normally we only instantiate one client device for the first
1721 * resource, using the ACPI HID as id. These special cases are handled
1722 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1723 * knows which client device id to use for each resource.
1724 */
1725 {"BSG1160", },
1726 {"BSG2150", },
1727 {"CSC3551", },
1728 {"CSC3556", },
1729 {"INT33FE", },
1730 {"INT3515", },
1731 /* Non-conforming _HID for Cirrus Logic already released */
1732 {"CLSA0100", },
1733 {"CLSA0101", },
1734 /*
1735 * Some ACPI devs contain SerialBus resources even though they are not
1736 * attached to a serial bus at all.
1737 */
1738 {ACPI_VIDEO_HID, },
1739 {"MSHW0028", },
1740 /*
1741 * HIDs of device with an UartSerialBusV2 resource for which userspace
1742 * expects a regular tty cdev to be created (instead of the in kernel
1743 * serdev) and which have a kernel driver which expects a platform_dev
1744 * such as the rfkill-gpio driver.
1745 */
1746 {"BCM4752", },
1747 {"LNV4752", },
1748 {}
1749 };
1750
1751 if (acpi_is_indirect_io_slave(device))
1752 return true;
1753
1754 /* Macs use device properties in lieu of _CRS resources */
1755 if (x86_apple_machine &&
1756 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1757 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1758 fwnode_property_present(&device->fwnode, "baud")))
1759 return true;
1760
1761 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1762 return false;
1763
1764 INIT_LIST_HEAD(&resource_list);
1765 acpi_dev_get_resources(device, &resource_list,
1766 acpi_check_serial_bus_slave,
1767 &is_serial_bus_slave);
1768 acpi_dev_free_resource_list(&resource_list);
1769
1770 return is_serial_bus_slave;
1771}
1772
1773void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1774 int type, void (*release)(struct device *))
1775{
1776 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1777
1778 INIT_LIST_HEAD(&device->pnp.ids);
1779 device->device_type = type;
1780 device->handle = handle;
1781 device->dev.parent = parent ? &parent->dev : NULL;
1782 device->dev.release = release;
1783 device->dev.bus = &acpi_bus_type;
1784 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1785 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1786 acpi_device_get_busid(device);
1787 acpi_set_pnp_ids(handle, &device->pnp, type);
1788 acpi_init_properties(device);
1789 acpi_bus_get_flags(device);
1790 device->flags.match_driver = false;
1791 device->flags.initialized = true;
1792 device->flags.enumeration_by_parent =
1793 acpi_device_enumeration_by_parent(device);
1794 acpi_device_clear_enumerated(device);
1795 device_initialize(&device->dev);
1796 dev_set_uevent_suppress(&device->dev, true);
1797 acpi_init_coherency(device);
1798}
1799
1800static void acpi_scan_dep_init(struct acpi_device *adev)
1801{
1802 struct acpi_dep_data *dep;
1803
1804 list_for_each_entry(dep, &acpi_dep_list, node) {
1805 if (dep->consumer == adev->handle) {
1806 if (dep->honor_dep)
1807 adev->flags.honor_deps = 1;
1808
1809 adev->dep_unmet++;
1810 }
1811 }
1812}
1813
1814void acpi_device_add_finalize(struct acpi_device *device)
1815{
1816 dev_set_uevent_suppress(&device->dev, false);
1817 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1818}
1819
1820static void acpi_scan_init_status(struct acpi_device *adev)
1821{
1822 if (acpi_bus_get_status(adev))
1823 acpi_set_device_status(adev, 0);
1824}
1825
1826static int acpi_add_single_object(struct acpi_device **child,
1827 acpi_handle handle, int type, bool dep_init)
1828{
1829 struct acpi_device *device;
1830 bool release_dep_lock = false;
1831 int result;
1832
1833 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1834 if (!device)
1835 return -ENOMEM;
1836
1837 acpi_init_device_object(device, handle, type, acpi_device_release);
1838 /*
1839 * Getting the status is delayed till here so that we can call
1840 * acpi_bus_get_status() and use its quirk handling. Note that
1841 * this must be done before the get power-/wakeup_dev-flags calls.
1842 */
1843 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1844 if (dep_init) {
1845 mutex_lock(&acpi_dep_list_lock);
1846 /*
1847 * Hold the lock until the acpi_tie_acpi_dev() call
1848 * below to prevent concurrent acpi_scan_clear_dep()
1849 * from deleting a dependency list entry without
1850 * updating dep_unmet for the device.
1851 */
1852 release_dep_lock = true;
1853 acpi_scan_dep_init(device);
1854 }
1855 acpi_scan_init_status(device);
1856 }
1857
1858 acpi_bus_get_power_flags(device);
1859 acpi_bus_get_wakeup_device_flags(device);
1860
1861 result = acpi_tie_acpi_dev(device);
1862
1863 if (release_dep_lock)
1864 mutex_unlock(&acpi_dep_list_lock);
1865
1866 if (!result)
1867 result = acpi_device_add(device);
1868
1869 if (result) {
1870 acpi_device_release(&device->dev);
1871 return result;
1872 }
1873
1874 acpi_power_add_remove_device(device, true);
1875 acpi_device_add_finalize(device);
1876
1877 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1878 dev_name(&device->dev), device->dev.parent ?
1879 dev_name(device->dev.parent) : "(null)");
1880
1881 *child = device;
1882 return 0;
1883}
1884
1885static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1886 void *context)
1887{
1888 struct resource *res = context;
1889
1890 if (acpi_dev_resource_memory(ares, res))
1891 return AE_CTRL_TERMINATE;
1892
1893 return AE_OK;
1894}
1895
1896static bool acpi_device_should_be_hidden(acpi_handle handle)
1897{
1898 acpi_status status;
1899 struct resource res;
1900
1901 /* Check if it should ignore the UART device */
1902 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1903 return false;
1904
1905 /*
1906 * The UART device described in SPCR table is assumed to have only one
1907 * memory resource present. So we only look for the first one here.
1908 */
1909 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1910 acpi_get_resource_memory, &res);
1911 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1912 return false;
1913
1914 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1915 &res.start);
1916
1917 return true;
1918}
1919
1920bool acpi_device_is_present(const struct acpi_device *adev)
1921{
1922 return adev->status.present || adev->status.functional;
1923}
1924
1925static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1926 const char *idstr,
1927 const struct acpi_device_id **matchid)
1928{
1929 const struct acpi_device_id *devid;
1930
1931 if (handler->match)
1932 return handler->match(idstr, matchid);
1933
1934 for (devid = handler->ids; devid->id[0]; devid++)
1935 if (!strcmp((char *)devid->id, idstr)) {
1936 if (matchid)
1937 *matchid = devid;
1938
1939 return true;
1940 }
1941
1942 return false;
1943}
1944
1945static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1946 const struct acpi_device_id **matchid)
1947{
1948 struct acpi_scan_handler *handler;
1949
1950 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1951 if (acpi_scan_handler_matching(handler, idstr, matchid))
1952 return handler;
1953
1954 return NULL;
1955}
1956
1957void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1958{
1959 if (!!hotplug->enabled == !!val)
1960 return;
1961
1962 mutex_lock(&acpi_scan_lock);
1963
1964 hotplug->enabled = val;
1965
1966 mutex_unlock(&acpi_scan_lock);
1967}
1968
1969static void acpi_scan_init_hotplug(struct acpi_device *adev)
1970{
1971 struct acpi_hardware_id *hwid;
1972
1973 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1974 acpi_dock_add(adev);
1975 return;
1976 }
1977 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1978 struct acpi_scan_handler *handler;
1979
1980 handler = acpi_scan_match_handler(hwid->id, NULL);
1981 if (handler) {
1982 adev->flags.hotplug_notify = true;
1983 break;
1984 }
1985 }
1986}
1987
1988static u32 acpi_scan_check_dep(acpi_handle handle)
1989{
1990 struct acpi_handle_list dep_devices;
1991 u32 count;
1992 int i;
1993
1994 /*
1995 * Check for _HID here to avoid deferring the enumeration of:
1996 * 1. PCI devices.
1997 * 2. ACPI nodes describing USB ports.
1998 * Still, checking for _HID catches more then just these cases ...
1999 */
2000 if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
2001 return 0;
2002
2003 if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
2004 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
2005 return 0;
2006 }
2007
2008 for (count = 0, i = 0; i < dep_devices.count; i++) {
2009 struct acpi_device_info *info;
2010 struct acpi_dep_data *dep;
2011 bool skip, honor_dep;
2012 acpi_status status;
2013
2014 status = acpi_get_object_info(dep_devices.handles[i], &info);
2015 if (ACPI_FAILURE(status)) {
2016 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2017 continue;
2018 }
2019
2020 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2021 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2022 kfree(info);
2023
2024 if (skip)
2025 continue;
2026
2027 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2028 if (!dep)
2029 continue;
2030
2031 count++;
2032
2033 dep->supplier = dep_devices.handles[i];
2034 dep->consumer = handle;
2035 dep->honor_dep = honor_dep;
2036
2037 mutex_lock(&acpi_dep_list_lock);
2038 list_add_tail(&dep->node , &acpi_dep_list);
2039 mutex_unlock(&acpi_dep_list_lock);
2040 }
2041
2042 acpi_handle_list_free(&dep_devices);
2043 return count;
2044}
2045
2046static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)
2047{
2048 acpi_mipi_check_crs_csi2(handle);
2049 return AE_OK;
2050}
2051
2052static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,
2053 struct acpi_device **adev_p)
2054{
2055 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2056 acpi_object_type acpi_type;
2057 int type;
2058
2059 if (device)
2060 goto out;
2061
2062 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2063 return AE_OK;
2064
2065 switch (acpi_type) {
2066 case ACPI_TYPE_DEVICE:
2067 if (acpi_device_should_be_hidden(handle))
2068 return AE_OK;
2069
2070 if (first_pass) {
2071 acpi_mipi_check_crs_csi2(handle);
2072
2073 /* Bail out if there are dependencies. */
2074 if (acpi_scan_check_dep(handle) > 0) {
2075 /*
2076 * The entire CSI-2 connection graph needs to be
2077 * extracted before any drivers or scan handlers
2078 * are bound to struct device objects, so scan
2079 * _CRS CSI-2 resource descriptors for all
2080 * devices below the current handle.
2081 */
2082 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
2083 ACPI_UINT32_MAX,
2084 acpi_scan_check_crs_csi2_cb,
2085 NULL, NULL, NULL);
2086 return AE_CTRL_DEPTH;
2087 }
2088 }
2089
2090 fallthrough;
2091 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2092 type = ACPI_BUS_TYPE_DEVICE;
2093 break;
2094
2095 case ACPI_TYPE_PROCESSOR:
2096 type = ACPI_BUS_TYPE_PROCESSOR;
2097 break;
2098
2099 case ACPI_TYPE_THERMAL:
2100 type = ACPI_BUS_TYPE_THERMAL;
2101 break;
2102
2103 case ACPI_TYPE_POWER:
2104 acpi_add_power_resource(handle);
2105 fallthrough;
2106 default:
2107 return AE_OK;
2108 }
2109
2110 /*
2111 * If first_pass is true at this point, the device has no dependencies,
2112 * or the creation of the device object would have been postponed above.
2113 */
2114 acpi_add_single_object(&device, handle, type, !first_pass);
2115 if (!device)
2116 return AE_CTRL_DEPTH;
2117
2118 acpi_scan_init_hotplug(device);
2119
2120out:
2121 if (!*adev_p)
2122 *adev_p = device;
2123
2124 return AE_OK;
2125}
2126
2127static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2128 void *not_used, void **ret_p)
2129{
2130 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2131}
2132
2133static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2134 void *not_used, void **ret_p)
2135{
2136 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2137}
2138
2139static void acpi_default_enumeration(struct acpi_device *device)
2140{
2141 /*
2142 * Do not enumerate devices with enumeration_by_parent flag set as
2143 * they will be enumerated by their respective parents.
2144 */
2145 if (!device->flags.enumeration_by_parent) {
2146 acpi_create_platform_device(device, NULL);
2147 acpi_device_set_enumerated(device);
2148 } else {
2149 blocking_notifier_call_chain(&acpi_reconfig_chain,
2150 ACPI_RECONFIG_DEVICE_ADD, device);
2151 }
2152}
2153
2154static const struct acpi_device_id generic_device_ids[] = {
2155 {ACPI_DT_NAMESPACE_HID, },
2156 {"", },
2157};
2158
2159static int acpi_generic_device_attach(struct acpi_device *adev,
2160 const struct acpi_device_id *not_used)
2161{
2162 /*
2163 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2164 * below can be unconditional.
2165 */
2166 if (adev->data.of_compatible)
2167 acpi_default_enumeration(adev);
2168
2169 return 1;
2170}
2171
2172static struct acpi_scan_handler generic_device_handler = {
2173 .ids = generic_device_ids,
2174 .attach = acpi_generic_device_attach,
2175};
2176
2177static int acpi_scan_attach_handler(struct acpi_device *device)
2178{
2179 struct acpi_hardware_id *hwid;
2180 int ret = 0;
2181
2182 list_for_each_entry(hwid, &device->pnp.ids, list) {
2183 const struct acpi_device_id *devid;
2184 struct acpi_scan_handler *handler;
2185
2186 handler = acpi_scan_match_handler(hwid->id, &devid);
2187 if (handler) {
2188 if (!handler->attach) {
2189 device->pnp.type.platform_id = 0;
2190 continue;
2191 }
2192 device->handler = handler;
2193 ret = handler->attach(device, devid);
2194 if (ret > 0)
2195 break;
2196
2197 device->handler = NULL;
2198 if (ret < 0)
2199 break;
2200 }
2201 }
2202
2203 return ret;
2204}
2205
2206static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2207{
2208 bool skip = !first_pass && device->flags.visited;
2209 acpi_handle ejd;
2210 int ret;
2211
2212 if (skip)
2213 goto ok;
2214
2215 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2216 register_dock_dependent_device(device, ejd);
2217
2218 acpi_bus_get_status(device);
2219 /* Skip devices that are not ready for enumeration (e.g. not present) */
2220 if (!acpi_dev_ready_for_enumeration(device)) {
2221 device->flags.initialized = false;
2222 acpi_device_clear_enumerated(device);
2223 device->flags.power_manageable = 0;
2224 return 0;
2225 }
2226 if (device->handler)
2227 goto ok;
2228
2229 if (!device->flags.initialized) {
2230 device->flags.power_manageable =
2231 device->power.states[ACPI_STATE_D0].flags.valid;
2232 if (acpi_bus_init_power(device))
2233 device->flags.power_manageable = 0;
2234
2235 device->flags.initialized = true;
2236 } else if (device->flags.visited) {
2237 goto ok;
2238 }
2239
2240 ret = acpi_scan_attach_handler(device);
2241 if (ret < 0)
2242 return 0;
2243
2244 device->flags.match_driver = true;
2245 if (ret > 0 && !device->flags.enumeration_by_parent) {
2246 acpi_device_set_enumerated(device);
2247 goto ok;
2248 }
2249
2250 ret = device_attach(&device->dev);
2251 if (ret < 0)
2252 return 0;
2253
2254 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2255 acpi_default_enumeration(device);
2256 else
2257 acpi_device_set_enumerated(device);
2258
2259ok:
2260 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2261
2262 if (!skip && device->handler && device->handler->hotplug.notify_online)
2263 device->handler->hotplug.notify_online(device);
2264
2265 return 0;
2266}
2267
2268static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2269{
2270 struct acpi_device **adev_p = data;
2271 struct acpi_device *adev = *adev_p;
2272
2273 /*
2274 * If we're passed a 'previous' consumer device then we need to skip
2275 * any consumers until we meet the previous one, and then NULL @data
2276 * so the next one can be returned.
2277 */
2278 if (adev) {
2279 if (dep->consumer == adev->handle)
2280 *adev_p = NULL;
2281
2282 return 0;
2283 }
2284
2285 adev = acpi_get_acpi_dev(dep->consumer);
2286 if (adev) {
2287 *(struct acpi_device **)data = adev;
2288 return 1;
2289 }
2290 /* Continue parsing if the device object is not present. */
2291 return 0;
2292}
2293
2294struct acpi_scan_clear_dep_work {
2295 struct work_struct work;
2296 struct acpi_device *adev;
2297};
2298
2299static void acpi_scan_clear_dep_fn(struct work_struct *work)
2300{
2301 struct acpi_scan_clear_dep_work *cdw;
2302
2303 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2304
2305 acpi_scan_lock_acquire();
2306 acpi_bus_attach(cdw->adev, (void *)true);
2307 acpi_scan_lock_release();
2308
2309 acpi_dev_put(cdw->adev);
2310 kfree(cdw);
2311}
2312
2313static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2314{
2315 struct acpi_scan_clear_dep_work *cdw;
2316
2317 if (adev->dep_unmet)
2318 return false;
2319
2320 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2321 if (!cdw)
2322 return false;
2323
2324 cdw->adev = adev;
2325 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2326 /*
2327 * Since the work function may block on the lock until the entire
2328 * initial enumeration of devices is complete, put it into the unbound
2329 * workqueue.
2330 */
2331 queue_work(system_unbound_wq, &cdw->work);
2332
2333 return true;
2334}
2335
2336static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
2337{
2338 list_del(&dep->node);
2339 kfree(dep);
2340}
2341
2342static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2343{
2344 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2345
2346 if (adev) {
2347 adev->dep_unmet--;
2348 if (!acpi_scan_clear_dep_queue(adev))
2349 acpi_dev_put(adev);
2350 }
2351
2352 if (dep->free_when_met)
2353 acpi_scan_delete_dep_data(dep);
2354 else
2355 dep->met = true;
2356
2357 return 0;
2358}
2359
2360/**
2361 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2362 * @handle: The ACPI handle of the supplier device
2363 * @callback: Pointer to the callback function to apply
2364 * @data: Pointer to some data to pass to the callback
2365 *
2366 * The return value of the callback determines this function's behaviour. If 0
2367 * is returned we continue to iterate over acpi_dep_list. If a positive value
2368 * is returned then the loop is broken but this function returns 0. If a
2369 * negative value is returned by the callback then the loop is broken and that
2370 * value is returned as the final error.
2371 */
2372static int acpi_walk_dep_device_list(acpi_handle handle,
2373 int (*callback)(struct acpi_dep_data *, void *),
2374 void *data)
2375{
2376 struct acpi_dep_data *dep, *tmp;
2377 int ret = 0;
2378
2379 mutex_lock(&acpi_dep_list_lock);
2380 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2381 if (dep->supplier == handle) {
2382 ret = callback(dep, data);
2383 if (ret)
2384 break;
2385 }
2386 }
2387 mutex_unlock(&acpi_dep_list_lock);
2388
2389 return ret > 0 ? 0 : ret;
2390}
2391
2392/**
2393 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2394 * @supplier: Pointer to the supplier &struct acpi_device
2395 *
2396 * Clear dependencies on the given device.
2397 */
2398void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2399{
2400 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2401}
2402EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2403
2404/**
2405 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2406 * @device: Pointer to the &struct acpi_device to check
2407 *
2408 * Check if the device is present and has no unmet dependencies.
2409 *
2410 * Return true if the device is ready for enumeratino. Otherwise, return false.
2411 */
2412bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2413{
2414 if (device->flags.honor_deps && device->dep_unmet)
2415 return false;
2416
2417 return acpi_device_is_present(device);
2418}
2419EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2420
2421/**
2422 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2423 * @supplier: Pointer to the dependee device
2424 * @start: Pointer to the current dependent device
2425 *
2426 * Returns the next &struct acpi_device which declares itself dependent on
2427 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2428 *
2429 * If the returned adev is not passed as @start to this function, the caller is
2430 * responsible for putting the reference to adev when it is no longer needed.
2431 */
2432struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2433 struct acpi_device *start)
2434{
2435 struct acpi_device *adev = start;
2436
2437 acpi_walk_dep_device_list(supplier->handle,
2438 acpi_dev_get_next_consumer_dev_cb, &adev);
2439
2440 acpi_dev_put(start);
2441
2442 if (adev == start)
2443 return NULL;
2444
2445 return adev;
2446}
2447EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2448
2449static void acpi_scan_postponed_branch(acpi_handle handle)
2450{
2451 struct acpi_device *adev = NULL;
2452
2453 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
2454 return;
2455
2456 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2457 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
2458
2459 /*
2460 * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that
2461 * have been added above.
2462 */
2463 acpi_mipi_init_crs_csi2_swnodes();
2464
2465 acpi_bus_attach(adev, NULL);
2466}
2467
2468static void acpi_scan_postponed(void)
2469{
2470 struct acpi_dep_data *dep, *tmp;
2471
2472 mutex_lock(&acpi_dep_list_lock);
2473
2474 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2475 acpi_handle handle = dep->consumer;
2476
2477 /*
2478 * In case there are multiple acpi_dep_list entries with the
2479 * same consumer, skip the current entry if the consumer device
2480 * object corresponding to it is present already.
2481 */
2482 if (!acpi_fetch_acpi_dev(handle)) {
2483 /*
2484 * Even though the lock is released here, tmp is
2485 * guaranteed to be valid, because none of the list
2486 * entries following dep is marked as "free when met"
2487 * and so they cannot be deleted.
2488 */
2489 mutex_unlock(&acpi_dep_list_lock);
2490
2491 acpi_scan_postponed_branch(handle);
2492
2493 mutex_lock(&acpi_dep_list_lock);
2494 }
2495
2496 if (dep->met)
2497 acpi_scan_delete_dep_data(dep);
2498 else
2499 dep->free_when_met = true;
2500 }
2501
2502 mutex_unlock(&acpi_dep_list_lock);
2503}
2504
2505/**
2506 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2507 * @handle: Root of the namespace scope to scan.
2508 *
2509 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2510 * found devices.
2511 *
2512 * If no devices were found, -ENODEV is returned, but it does not mean that
2513 * there has been a real error. There just have been no suitable ACPI objects
2514 * in the table trunk from which the kernel could create a device and add an
2515 * appropriate driver.
2516 *
2517 * Must be called under acpi_scan_lock.
2518 */
2519int acpi_bus_scan(acpi_handle handle)
2520{
2521 struct acpi_device *device = NULL;
2522
2523 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2524
2525 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2526 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2527 acpi_bus_check_add_1, NULL, NULL,
2528 (void **)&device);
2529
2530 if (!device)
2531 return -ENODEV;
2532
2533 /*
2534 * Set up ACPI _CRS CSI-2 software nodes using information extracted
2535 * from the _CRS CSI-2 resource descriptors during the ACPI namespace
2536 * walk above and MIPI DisCo for Imaging device properties.
2537 */
2538 acpi_mipi_scan_crs_csi2();
2539 acpi_mipi_init_crs_csi2_swnodes();
2540
2541 acpi_bus_attach(device, (void *)true);
2542
2543 /* Pass 2: Enumerate all of the remaining devices. */
2544
2545 acpi_scan_postponed();
2546
2547 acpi_mipi_crs_csi2_cleanup();
2548
2549 return 0;
2550}
2551EXPORT_SYMBOL(acpi_bus_scan);
2552
2553static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
2554{
2555 struct acpi_scan_handler *handler = adev->handler;
2556
2557 acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
2558
2559 adev->flags.match_driver = false;
2560 if (handler) {
2561 if (handler->detach)
2562 handler->detach(adev);
2563
2564 adev->handler = NULL;
2565 } else {
2566 device_release_driver(&adev->dev);
2567 }
2568 /*
2569 * Most likely, the device is going away, so put it into D3cold before
2570 * that.
2571 */
2572 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2573 adev->flags.initialized = false;
2574 acpi_device_clear_enumerated(adev);
2575
2576 return 0;
2577}
2578
2579/**
2580 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2581 * @adev: Root of the ACPI namespace scope to walk.
2582 *
2583 * Must be called under acpi_scan_lock.
2584 */
2585void acpi_bus_trim(struct acpi_device *adev)
2586{
2587 acpi_bus_trim_one(adev, NULL);
2588}
2589EXPORT_SYMBOL_GPL(acpi_bus_trim);
2590
2591int acpi_bus_register_early_device(int type)
2592{
2593 struct acpi_device *device = NULL;
2594 int result;
2595
2596 result = acpi_add_single_object(&device, NULL, type, false);
2597 if (result)
2598 return result;
2599
2600 device->flags.match_driver = true;
2601 return device_attach(&device->dev);
2602}
2603EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2604
2605static void acpi_bus_scan_fixed(void)
2606{
2607 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2608 struct acpi_device *adev = NULL;
2609
2610 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2611 false);
2612 if (adev) {
2613 adev->flags.match_driver = true;
2614 if (device_attach(&adev->dev) >= 0)
2615 device_init_wakeup(&adev->dev, true);
2616 else
2617 dev_dbg(&adev->dev, "No driver\n");
2618 }
2619 }
2620
2621 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2622 struct acpi_device *adev = NULL;
2623
2624 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2625 false);
2626 if (adev) {
2627 adev->flags.match_driver = true;
2628 if (device_attach(&adev->dev) < 0)
2629 dev_dbg(&adev->dev, "No driver\n");
2630 }
2631 }
2632}
2633
2634static void __init acpi_get_spcr_uart_addr(void)
2635{
2636 acpi_status status;
2637 struct acpi_table_spcr *spcr_ptr;
2638
2639 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2640 (struct acpi_table_header **)&spcr_ptr);
2641 if (ACPI_FAILURE(status)) {
2642 pr_warn("STAO table present, but SPCR is missing\n");
2643 return;
2644 }
2645
2646 spcr_uart_addr = spcr_ptr->serial_port.address;
2647 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2648}
2649
2650static bool acpi_scan_initialized;
2651
2652void __init acpi_scan_init(void)
2653{
2654 acpi_status status;
2655 struct acpi_table_stao *stao_ptr;
2656
2657 acpi_pci_root_init();
2658 acpi_pci_link_init();
2659 acpi_processor_init();
2660 acpi_platform_init();
2661 acpi_lpss_init();
2662 acpi_apd_init();
2663 acpi_cmos_rtc_init();
2664 acpi_container_init();
2665 acpi_memory_hotplug_init();
2666 acpi_watchdog_init();
2667 acpi_pnp_init();
2668 acpi_int340x_thermal_init();
2669 acpi_init_lpit();
2670
2671 acpi_scan_add_handler(&generic_device_handler);
2672
2673 /*
2674 * If there is STAO table, check whether it needs to ignore the UART
2675 * device in SPCR table.
2676 */
2677 status = acpi_get_table(ACPI_SIG_STAO, 0,
2678 (struct acpi_table_header **)&stao_ptr);
2679 if (ACPI_SUCCESS(status)) {
2680 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2681 pr_info("STAO Name List not yet supported.\n");
2682
2683 if (stao_ptr->ignore_uart)
2684 acpi_get_spcr_uart_addr();
2685
2686 acpi_put_table((struct acpi_table_header *)stao_ptr);
2687 }
2688
2689 acpi_gpe_apply_masked_gpes();
2690 acpi_update_all_gpes();
2691
2692 /*
2693 * Although we call __add_memory() that is documented to require the
2694 * device_hotplug_lock, it is not necessary here because this is an
2695 * early code when userspace or any other code path cannot trigger
2696 * hotplug/hotunplug operations.
2697 */
2698 mutex_lock(&acpi_scan_lock);
2699 /*
2700 * Enumerate devices in the ACPI namespace.
2701 */
2702 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2703 goto unlock;
2704
2705 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2706 if (!acpi_root)
2707 goto unlock;
2708
2709 /* Fixed feature devices do not exist on HW-reduced platform */
2710 if (!acpi_gbl_reduced_hardware)
2711 acpi_bus_scan_fixed();
2712
2713 acpi_turn_off_unused_power_resources();
2714
2715 acpi_scan_initialized = true;
2716
2717unlock:
2718 mutex_unlock(&acpi_scan_lock);
2719}
2720
2721static struct acpi_probe_entry *ape;
2722static int acpi_probe_count;
2723static DEFINE_MUTEX(acpi_probe_mutex);
2724
2725static int __init acpi_match_madt(union acpi_subtable_headers *header,
2726 const unsigned long end)
2727{
2728 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2729 if (!ape->probe_subtbl(header, end))
2730 acpi_probe_count++;
2731
2732 return 0;
2733}
2734
2735int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2736{
2737 int count = 0;
2738
2739 if (acpi_disabled)
2740 return 0;
2741
2742 mutex_lock(&acpi_probe_mutex);
2743 for (ape = ap_head; nr; ape++, nr--) {
2744 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2745 acpi_probe_count = 0;
2746 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2747 count += acpi_probe_count;
2748 } else {
2749 int res;
2750 res = acpi_table_parse(ape->id, ape->probe_table);
2751 if (!res)
2752 count++;
2753 }
2754 }
2755 mutex_unlock(&acpi_probe_mutex);
2756
2757 return count;
2758}
2759
2760static void acpi_table_events_fn(struct work_struct *work)
2761{
2762 acpi_scan_lock_acquire();
2763 acpi_bus_scan(ACPI_ROOT_OBJECT);
2764 acpi_scan_lock_release();
2765
2766 kfree(work);
2767}
2768
2769void acpi_scan_table_notify(void)
2770{
2771 struct work_struct *work;
2772
2773 if (!acpi_scan_initialized)
2774 return;
2775
2776 work = kmalloc(sizeof(*work), GFP_KERNEL);
2777 if (!work)
2778 return;
2779
2780 INIT_WORK(work, acpi_table_events_fn);
2781 schedule_work(work);
2782}
2783
2784int acpi_reconfig_notifier_register(struct notifier_block *nb)
2785{
2786 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2787}
2788EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2789
2790int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2791{
2792 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2793}
2794EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);