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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_check_and_detach(struct acpi_device *adev, void *check)
248{
249 struct acpi_scan_handler *handler = adev->handler;
250
251 acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, check);
252
253 if (check) {
254 acpi_bus_get_status(adev);
255 /*
256 * Skip devices that are still there and take the enabled
257 * flag into account.
258 */
259 if (acpi_device_is_enabled(adev))
260 return 0;
261
262 /* Skip device that have not been enumerated. */
263 if (!acpi_device_enumerated(adev)) {
264 dev_dbg(&adev->dev, "Still not enumerated\n");
265 return 0;
266 }
267 }
268
269 adev->flags.match_driver = false;
270 if (handler) {
271 if (handler->detach)
272 handler->detach(adev);
273
274 adev->handler = NULL;
275 } else {
276 device_release_driver(&adev->dev);
277 }
278 /*
279 * Most likely, the device is going away, so put it into D3cold before
280 * that.
281 */
282 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
283 adev->flags.initialized = false;
284 acpi_device_clear_enumerated(adev);
285
286 return 0;
287}
288
289static void acpi_scan_check_subtree(struct acpi_device *adev)
290{
291 acpi_scan_check_and_detach(adev, (void *)true);
292}
293
294static int acpi_scan_hot_remove(struct acpi_device *device)
295{
296 acpi_handle handle = device->handle;
297 unsigned long long sta;
298 acpi_status status;
299
300 if (device->handler && device->handler->hotplug.demand_offline) {
301 if (!acpi_scan_is_offline(device, true))
302 return -EBUSY;
303 } else {
304 int error = acpi_scan_try_to_offline(device);
305 if (error)
306 return error;
307 }
308
309 acpi_handle_debug(handle, "Ejecting\n");
310
311 acpi_bus_trim(device);
312
313 acpi_evaluate_lck(handle, 0);
314 /*
315 * TBD: _EJD support.
316 */
317 status = acpi_evaluate_ej0(handle);
318 if (status == AE_NOT_FOUND)
319 return -ENODEV;
320 else if (ACPI_FAILURE(status))
321 return -EIO;
322
323 /*
324 * Verify if eject was indeed successful. If not, log an error
325 * message. No need to call _OST since _EJ0 call was made OK.
326 */
327 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
328 if (ACPI_FAILURE(status)) {
329 acpi_handle_warn(handle,
330 "Status check after eject failed (0x%x)\n", status);
331 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
332 acpi_handle_warn(handle,
333 "Eject incomplete - status 0x%llx\n", sta);
334 }
335
336 return 0;
337}
338
339static int acpi_scan_rescan_bus(struct acpi_device *adev)
340{
341 struct acpi_scan_handler *handler = adev->handler;
342 int ret;
343
344 if (handler && handler->hotplug.scan_dependent)
345 ret = handler->hotplug.scan_dependent(adev);
346 else
347 ret = acpi_bus_scan(adev->handle);
348
349 if (ret)
350 dev_info(&adev->dev, "Namespace scan failure\n");
351
352 return ret;
353}
354
355static int acpi_scan_device_check(struct acpi_device *adev)
356{
357 struct acpi_device *parent;
358
359 acpi_scan_check_subtree(adev);
360
361 if (!acpi_device_is_present(adev))
362 return 0;
363
364 /*
365 * This function is only called for device objects for which matching
366 * scan handlers exist. The only situation in which the scan handler
367 * is not attached to this device object yet is when the device has
368 * just appeared (either it wasn't present at all before or it was
369 * removed and then added again).
370 */
371 if (adev->handler) {
372 dev_dbg(&adev->dev, "Already enumerated\n");
373 return 0;
374 }
375
376 parent = acpi_dev_parent(adev);
377 if (!parent)
378 parent = adev;
379
380 return acpi_scan_rescan_bus(parent);
381}
382
383static int acpi_scan_bus_check(struct acpi_device *adev)
384{
385 acpi_scan_check_subtree(adev);
386
387 return acpi_scan_rescan_bus(adev);
388}
389
390static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
391{
392 switch (type) {
393 case ACPI_NOTIFY_BUS_CHECK:
394 return acpi_scan_bus_check(adev);
395 case ACPI_NOTIFY_DEVICE_CHECK:
396 return acpi_scan_device_check(adev);
397 case ACPI_NOTIFY_EJECT_REQUEST:
398 case ACPI_OST_EC_OSPM_EJECT:
399 if (adev->handler && !adev->handler->hotplug.enabled) {
400 dev_info(&adev->dev, "Eject disabled\n");
401 return -EPERM;
402 }
403 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
404 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
405 return acpi_scan_hot_remove(adev);
406 }
407 return -EINVAL;
408}
409
410void acpi_device_hotplug(struct acpi_device *adev, u32 src)
411{
412 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
413 int error = -ENODEV;
414
415 lock_device_hotplug();
416 mutex_lock(&acpi_scan_lock);
417
418 /*
419 * The device object's ACPI handle cannot become invalid as long as we
420 * are holding acpi_scan_lock, but it might have become invalid before
421 * that lock was acquired.
422 */
423 if (adev->handle == INVALID_ACPI_HANDLE)
424 goto err_out;
425
426 if (adev->flags.is_dock_station) {
427 error = dock_notify(adev, src);
428 } else if (adev->flags.hotplug_notify) {
429 error = acpi_generic_hotplug_event(adev, src);
430 } else {
431 int (*notify)(struct acpi_device *, u32);
432
433 acpi_lock_hp_context();
434 notify = adev->hp ? adev->hp->notify : NULL;
435 acpi_unlock_hp_context();
436 /*
437 * There may be additional notify handlers for device objects
438 * without the .event() callback, so ignore them here.
439 */
440 if (notify)
441 error = notify(adev, src);
442 else
443 goto out;
444 }
445 switch (error) {
446 case 0:
447 ost_code = ACPI_OST_SC_SUCCESS;
448 break;
449 case -EPERM:
450 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
451 break;
452 case -EBUSY:
453 ost_code = ACPI_OST_SC_DEVICE_BUSY;
454 break;
455 default:
456 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
457 break;
458 }
459
460 err_out:
461 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
462
463 out:
464 acpi_put_acpi_dev(adev);
465 mutex_unlock(&acpi_scan_lock);
466 unlock_device_hotplug();
467}
468
469static void acpi_free_power_resources_lists(struct acpi_device *device)
470{
471 int i;
472
473 if (device->wakeup.flags.valid)
474 acpi_power_resources_list_free(&device->wakeup.resources);
475
476 if (!device->power.flags.power_resources)
477 return;
478
479 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
480 struct acpi_device_power_state *ps = &device->power.states[i];
481 acpi_power_resources_list_free(&ps->resources);
482 }
483}
484
485static void acpi_device_release(struct device *dev)
486{
487 struct acpi_device *acpi_dev = to_acpi_device(dev);
488
489 acpi_free_properties(acpi_dev);
490 acpi_free_pnp_ids(&acpi_dev->pnp);
491 acpi_free_power_resources_lists(acpi_dev);
492 kfree(acpi_dev);
493}
494
495static void acpi_device_del(struct acpi_device *device)
496{
497 struct acpi_device_bus_id *acpi_device_bus_id;
498
499 mutex_lock(&acpi_device_lock);
500
501 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
502 if (!strcmp(acpi_device_bus_id->bus_id,
503 acpi_device_hid(device))) {
504 ida_free(&acpi_device_bus_id->instance_ida,
505 device->pnp.instance_no);
506 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
507 list_del(&acpi_device_bus_id->node);
508 kfree_const(acpi_device_bus_id->bus_id);
509 kfree(acpi_device_bus_id);
510 }
511 break;
512 }
513
514 list_del(&device->wakeup_list);
515
516 mutex_unlock(&acpi_device_lock);
517
518 acpi_power_add_remove_device(device, false);
519 acpi_device_remove_files(device);
520 if (device->remove)
521 device->remove(device);
522
523 device_del(&device->dev);
524}
525
526static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
527
528static LIST_HEAD(acpi_device_del_list);
529static DEFINE_MUTEX(acpi_device_del_lock);
530
531static void acpi_device_del_work_fn(struct work_struct *work_not_used)
532{
533 for (;;) {
534 struct acpi_device *adev;
535
536 mutex_lock(&acpi_device_del_lock);
537
538 if (list_empty(&acpi_device_del_list)) {
539 mutex_unlock(&acpi_device_del_lock);
540 break;
541 }
542 adev = list_first_entry(&acpi_device_del_list,
543 struct acpi_device, del_list);
544 list_del(&adev->del_list);
545
546 mutex_unlock(&acpi_device_del_lock);
547
548 blocking_notifier_call_chain(&acpi_reconfig_chain,
549 ACPI_RECONFIG_DEVICE_REMOVE, adev);
550
551 acpi_device_del(adev);
552 /*
553 * Drop references to all power resources that might have been
554 * used by the device.
555 */
556 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
557 acpi_dev_put(adev);
558 }
559}
560
561/**
562 * acpi_scan_drop_device - Drop an ACPI device object.
563 * @handle: Handle of an ACPI namespace node, not used.
564 * @context: Address of the ACPI device object to drop.
565 *
566 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
567 * namespace node the device object pointed to by @context is attached to.
568 *
569 * The unregistration is carried out asynchronously to avoid running
570 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
571 * ensure the correct ordering (the device objects must be unregistered in the
572 * same order in which the corresponding namespace nodes are deleted).
573 */
574static void acpi_scan_drop_device(acpi_handle handle, void *context)
575{
576 static DECLARE_WORK(work, acpi_device_del_work_fn);
577 struct acpi_device *adev = context;
578
579 mutex_lock(&acpi_device_del_lock);
580
581 /*
582 * Use the ACPI hotplug workqueue which is ordered, so this work item
583 * won't run after any hotplug work items submitted subsequently. That
584 * prevents attempts to register device objects identical to those being
585 * deleted from happening concurrently (such attempts result from
586 * hotplug events handled via the ACPI hotplug workqueue). It also will
587 * run after all of the work items submitted previously, which helps
588 * those work items to ensure that they are not accessing stale device
589 * objects.
590 */
591 if (list_empty(&acpi_device_del_list))
592 acpi_queue_hotplug_work(&work);
593
594 list_add_tail(&adev->del_list, &acpi_device_del_list);
595 /* Make acpi_ns_validate_handle() return NULL for this handle. */
596 adev->handle = INVALID_ACPI_HANDLE;
597
598 mutex_unlock(&acpi_device_del_lock);
599}
600
601static struct acpi_device *handle_to_device(acpi_handle handle,
602 void (*callback)(void *))
603{
604 struct acpi_device *adev = NULL;
605 acpi_status status;
606
607 status = acpi_get_data_full(handle, acpi_scan_drop_device,
608 (void **)&adev, callback);
609 if (ACPI_FAILURE(status) || !adev) {
610 acpi_handle_debug(handle, "No context!\n");
611 return NULL;
612 }
613 return adev;
614}
615
616/**
617 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
618 * @handle: ACPI handle associated with the requested ACPI device object.
619 *
620 * Return a pointer to the ACPI device object associated with @handle, if
621 * present, or NULL otherwise.
622 */
623struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
624{
625 return handle_to_device(handle, NULL);
626}
627EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
628
629static void get_acpi_device(void *dev)
630{
631 acpi_dev_get(dev);
632}
633
634/**
635 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
636 * @handle: ACPI handle associated with the requested ACPI device object.
637 *
638 * Return a pointer to the ACPI device object associated with @handle and bump
639 * up that object's reference counter (under the ACPI Namespace lock), if
640 * present, or return NULL otherwise.
641 *
642 * The ACPI device object reference acquired by this function needs to be
643 * dropped via acpi_dev_put().
644 */
645struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
646{
647 return handle_to_device(handle, get_acpi_device);
648}
649EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
650
651static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
652{
653 struct acpi_device_bus_id *acpi_device_bus_id;
654
655 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
656 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
657 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
658 return acpi_device_bus_id;
659 }
660 return NULL;
661}
662
663static int acpi_device_set_name(struct acpi_device *device,
664 struct acpi_device_bus_id *acpi_device_bus_id)
665{
666 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
667 int result;
668
669 result = ida_alloc(instance_ida, GFP_KERNEL);
670 if (result < 0)
671 return result;
672
673 device->pnp.instance_no = result;
674 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
675 return 0;
676}
677
678int acpi_tie_acpi_dev(struct acpi_device *adev)
679{
680 acpi_handle handle = adev->handle;
681 acpi_status status;
682
683 if (!handle)
684 return 0;
685
686 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
687 if (ACPI_FAILURE(status)) {
688 acpi_handle_err(handle, "Unable to attach device data\n");
689 return -ENODEV;
690 }
691
692 return 0;
693}
694
695static void acpi_store_pld_crc(struct acpi_device *adev)
696{
697 struct acpi_pld_info *pld;
698 acpi_status status;
699
700 status = acpi_get_physical_device_location(adev->handle, &pld);
701 if (ACPI_FAILURE(status))
702 return;
703
704 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
705 ACPI_FREE(pld);
706}
707
708int acpi_device_add(struct acpi_device *device)
709{
710 struct acpi_device_bus_id *acpi_device_bus_id;
711 int result;
712
713 /*
714 * Linkage
715 * -------
716 * Link this device to its parent and siblings.
717 */
718 INIT_LIST_HEAD(&device->wakeup_list);
719 INIT_LIST_HEAD(&device->physical_node_list);
720 INIT_LIST_HEAD(&device->del_list);
721 mutex_init(&device->physical_node_lock);
722
723 mutex_lock(&acpi_device_lock);
724
725 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
726 if (acpi_device_bus_id) {
727 result = acpi_device_set_name(device, acpi_device_bus_id);
728 if (result)
729 goto err_unlock;
730 } else {
731 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
732 GFP_KERNEL);
733 if (!acpi_device_bus_id) {
734 result = -ENOMEM;
735 goto err_unlock;
736 }
737 acpi_device_bus_id->bus_id =
738 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
739 if (!acpi_device_bus_id->bus_id) {
740 kfree(acpi_device_bus_id);
741 result = -ENOMEM;
742 goto err_unlock;
743 }
744
745 ida_init(&acpi_device_bus_id->instance_ida);
746
747 result = acpi_device_set_name(device, acpi_device_bus_id);
748 if (result) {
749 kfree_const(acpi_device_bus_id->bus_id);
750 kfree(acpi_device_bus_id);
751 goto err_unlock;
752 }
753
754 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
755 }
756
757 if (device->wakeup.flags.valid)
758 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
759
760 acpi_store_pld_crc(device);
761
762 mutex_unlock(&acpi_device_lock);
763
764 result = device_add(&device->dev);
765 if (result) {
766 dev_err(&device->dev, "Error registering device\n");
767 goto err;
768 }
769
770 result = acpi_device_setup_files(device);
771 if (result)
772 pr_err("Error creating sysfs interface for device %s\n",
773 dev_name(&device->dev));
774
775 return 0;
776
777err:
778 mutex_lock(&acpi_device_lock);
779
780 list_del(&device->wakeup_list);
781
782err_unlock:
783 mutex_unlock(&acpi_device_lock);
784
785 acpi_detach_data(device->handle, acpi_scan_drop_device);
786
787 return result;
788}
789
790/* --------------------------------------------------------------------------
791 Device Enumeration
792 -------------------------------------------------------------------------- */
793static bool acpi_info_matches_ids(struct acpi_device_info *info,
794 const char * const ids[])
795{
796 struct acpi_pnp_device_id_list *cid_list = NULL;
797 int i, index;
798
799 if (!(info->valid & ACPI_VALID_HID))
800 return false;
801
802 index = match_string(ids, -1, info->hardware_id.string);
803 if (index >= 0)
804 return true;
805
806 if (info->valid & ACPI_VALID_CID)
807 cid_list = &info->compatible_id_list;
808
809 if (!cid_list)
810 return false;
811
812 for (i = 0; i < cid_list->count; i++) {
813 index = match_string(ids, -1, cid_list->ids[i].string);
814 if (index >= 0)
815 return true;
816 }
817
818 return false;
819}
820
821/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
822static const char * const acpi_ignore_dep_ids[] = {
823 "PNP0D80", /* Windows-compatible System Power Management Controller */
824 "INT33BD", /* Intel Baytrail Mailbox Device */
825 "LATT2021", /* Lattice FW Update Client Driver */
826 NULL
827};
828
829/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
830static const char * const acpi_honor_dep_ids[] = {
831 "INT3472", /* Camera sensor PMIC / clk and regulator info */
832 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
833 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
834 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
835 "INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */
836 NULL
837};
838
839static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
840{
841 struct acpi_device *adev;
842
843 /*
844 * Fixed hardware devices do not appear in the namespace and do not
845 * have handles, but we fabricate acpi_devices for them, so we have
846 * to deal with them specially.
847 */
848 if (!handle)
849 return acpi_root;
850
851 do {
852 acpi_status status;
853
854 status = acpi_get_parent(handle, &handle);
855 if (ACPI_FAILURE(status)) {
856 if (status != AE_NULL_ENTRY)
857 return acpi_root;
858
859 return NULL;
860 }
861 adev = acpi_fetch_acpi_dev(handle);
862 } while (!adev);
863 return adev;
864}
865
866acpi_status
867acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
868{
869 acpi_status status;
870 acpi_handle tmp;
871 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
872 union acpi_object *obj;
873
874 status = acpi_get_handle(handle, "_EJD", &tmp);
875 if (ACPI_FAILURE(status))
876 return status;
877
878 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
879 if (ACPI_SUCCESS(status)) {
880 obj = buffer.pointer;
881 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
882 ejd);
883 kfree(buffer.pointer);
884 }
885 return status;
886}
887EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
888
889static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
890{
891 acpi_handle handle = dev->handle;
892 struct acpi_device_wakeup *wakeup = &dev->wakeup;
893 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
894 union acpi_object *package = NULL;
895 union acpi_object *element = NULL;
896 acpi_status status;
897 int err = -ENODATA;
898
899 INIT_LIST_HEAD(&wakeup->resources);
900
901 /* _PRW */
902 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
903 if (ACPI_FAILURE(status)) {
904 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
905 acpi_format_exception(status));
906 return err;
907 }
908
909 package = (union acpi_object *)buffer.pointer;
910
911 if (!package || package->package.count < 2)
912 goto out;
913
914 element = &(package->package.elements[0]);
915 if (!element)
916 goto out;
917
918 if (element->type == ACPI_TYPE_PACKAGE) {
919 if ((element->package.count < 2) ||
920 (element->package.elements[0].type !=
921 ACPI_TYPE_LOCAL_REFERENCE)
922 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
923 goto out;
924
925 wakeup->gpe_device =
926 element->package.elements[0].reference.handle;
927 wakeup->gpe_number =
928 (u32) element->package.elements[1].integer.value;
929 } else if (element->type == ACPI_TYPE_INTEGER) {
930 wakeup->gpe_device = NULL;
931 wakeup->gpe_number = element->integer.value;
932 } else {
933 goto out;
934 }
935
936 element = &(package->package.elements[1]);
937 if (element->type != ACPI_TYPE_INTEGER)
938 goto out;
939
940 wakeup->sleep_state = element->integer.value;
941
942 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
943 if (err)
944 goto out;
945
946 if (!list_empty(&wakeup->resources)) {
947 int sleep_state;
948
949 err = acpi_power_wakeup_list_init(&wakeup->resources,
950 &sleep_state);
951 if (err) {
952 acpi_handle_warn(handle, "Retrieving current states "
953 "of wakeup power resources failed\n");
954 acpi_power_resources_list_free(&wakeup->resources);
955 goto out;
956 }
957 if (sleep_state < wakeup->sleep_state) {
958 acpi_handle_warn(handle, "Overriding _PRW sleep state "
959 "(S%d) by S%d from power resources\n",
960 (int)wakeup->sleep_state, sleep_state);
961 wakeup->sleep_state = sleep_state;
962 }
963 }
964
965 out:
966 kfree(buffer.pointer);
967 return err;
968}
969
970/* Do not use a button for S5 wakeup */
971#define ACPI_AVOID_WAKE_FROM_S5 BIT(0)
972
973static bool acpi_wakeup_gpe_init(struct acpi_device *device)
974{
975 static const struct acpi_device_id button_device_ids[] = {
976 {"PNP0C0C", 0}, /* Power button */
977 {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */
978 {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */
979 {"", 0},
980 };
981 struct acpi_device_wakeup *wakeup = &device->wakeup;
982 const struct acpi_device_id *match;
983 acpi_status status;
984
985 wakeup->flags.notifier_present = 0;
986
987 /* Power button, Lid switch always enable wakeup */
988 match = acpi_match_acpi_device(button_device_ids, device);
989 if (match) {
990 if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&
991 wakeup->sleep_state == ACPI_STATE_S5)
992 wakeup->sleep_state = ACPI_STATE_S4;
993 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
994 device_set_wakeup_capable(&device->dev, true);
995 return true;
996 }
997
998 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
999 wakeup->gpe_number);
1000 return ACPI_SUCCESS(status);
1001}
1002
1003static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1004{
1005 int err;
1006
1007 /* Presence of _PRW indicates wake capable */
1008 if (!acpi_has_method(device->handle, "_PRW"))
1009 return;
1010
1011 err = acpi_bus_extract_wakeup_device_power_package(device);
1012 if (err) {
1013 dev_err(&device->dev, "Unable to extract wakeup power resources");
1014 return;
1015 }
1016
1017 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
1018 device->wakeup.prepare_count = 0;
1019 /*
1020 * Call _PSW/_DSW object to disable its ability to wake the sleeping
1021 * system for the ACPI device with the _PRW object.
1022 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
1023 * So it is necessary to call _DSW object first. Only when it is not
1024 * present will the _PSW object used.
1025 */
1026 err = acpi_device_sleep_wake(device, 0, 0, 0);
1027 if (err)
1028 pr_debug("error in _DSW or _PSW evaluation\n");
1029}
1030
1031static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1032{
1033 struct acpi_device_power_state *ps = &device->power.states[state];
1034 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1035 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1036 acpi_status status;
1037
1038 INIT_LIST_HEAD(&ps->resources);
1039
1040 /* Evaluate "_PRx" to get referenced power resources */
1041 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1042 if (ACPI_SUCCESS(status)) {
1043 union acpi_object *package = buffer.pointer;
1044
1045 if (buffer.length && package
1046 && package->type == ACPI_TYPE_PACKAGE
1047 && package->package.count)
1048 acpi_extract_power_resources(package, 0, &ps->resources);
1049
1050 ACPI_FREE(buffer.pointer);
1051 }
1052
1053 /* Evaluate "_PSx" to see if we can do explicit sets */
1054 pathname[2] = 'S';
1055 if (acpi_has_method(device->handle, pathname))
1056 ps->flags.explicit_set = 1;
1057
1058 /* State is valid if there are means to put the device into it. */
1059 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1060 ps->flags.valid = 1;
1061
1062 ps->power = -1; /* Unknown - driver assigned */
1063 ps->latency = -1; /* Unknown - driver assigned */
1064}
1065
1066static void acpi_bus_get_power_flags(struct acpi_device *device)
1067{
1068 unsigned long long dsc = ACPI_STATE_D0;
1069 u32 i;
1070
1071 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1072 if (!acpi_has_method(device->handle, "_PS0") &&
1073 !acpi_has_method(device->handle, "_PR0"))
1074 return;
1075
1076 device->flags.power_manageable = 1;
1077
1078 /*
1079 * Power Management Flags
1080 */
1081 if (acpi_has_method(device->handle, "_PSC"))
1082 device->power.flags.explicit_get = 1;
1083
1084 if (acpi_has_method(device->handle, "_IRC"))
1085 device->power.flags.inrush_current = 1;
1086
1087 if (acpi_has_method(device->handle, "_DSW"))
1088 device->power.flags.dsw_present = 1;
1089
1090 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1091 device->power.state_for_enumeration = dsc;
1092
1093 /*
1094 * Enumerate supported power management states
1095 */
1096 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1097 acpi_bus_init_power_state(device, i);
1098
1099 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1100
1101 /* Set the defaults for D0 and D3hot (always supported). */
1102 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1103 device->power.states[ACPI_STATE_D0].power = 100;
1104 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1105
1106 /*
1107 * Use power resources only if the D0 list of them is populated, because
1108 * some platforms may provide _PR3 only to indicate D3cold support and
1109 * in those cases the power resources list returned by it may be bogus.
1110 */
1111 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1112 device->power.flags.power_resources = 1;
1113 /*
1114 * D3cold is supported if the D3hot list of power resources is
1115 * not empty.
1116 */
1117 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1118 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1119 }
1120
1121 if (acpi_bus_init_power(device))
1122 device->flags.power_manageable = 0;
1123}
1124
1125static void acpi_bus_get_flags(struct acpi_device *device)
1126{
1127 /* Presence of _STA indicates 'dynamic_status' */
1128 if (acpi_has_method(device->handle, "_STA"))
1129 device->flags.dynamic_status = 1;
1130
1131 /* Presence of _RMV indicates 'removable' */
1132 if (acpi_has_method(device->handle, "_RMV"))
1133 device->flags.removable = 1;
1134
1135 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1136 if (acpi_has_method(device->handle, "_EJD") ||
1137 acpi_has_method(device->handle, "_EJ0"))
1138 device->flags.ejectable = 1;
1139}
1140
1141static void acpi_device_get_busid(struct acpi_device *device)
1142{
1143 char bus_id[5] = { '?', 0 };
1144 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1145 int i = 0;
1146
1147 /*
1148 * Bus ID
1149 * ------
1150 * The device's Bus ID is simply the object name.
1151 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1152 */
1153 if (!acpi_dev_parent(device)) {
1154 strcpy(device->pnp.bus_id, "ACPI");
1155 return;
1156 }
1157
1158 switch (device->device_type) {
1159 case ACPI_BUS_TYPE_POWER_BUTTON:
1160 strcpy(device->pnp.bus_id, "PWRF");
1161 break;
1162 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1163 strcpy(device->pnp.bus_id, "SLPF");
1164 break;
1165 case ACPI_BUS_TYPE_ECDT_EC:
1166 strcpy(device->pnp.bus_id, "ECDT");
1167 break;
1168 default:
1169 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1170 /* Clean up trailing underscores (if any) */
1171 for (i = 3; i > 1; i--) {
1172 if (bus_id[i] == '_')
1173 bus_id[i] = '\0';
1174 else
1175 break;
1176 }
1177 strcpy(device->pnp.bus_id, bus_id);
1178 break;
1179 }
1180}
1181
1182/*
1183 * acpi_ata_match - see if an acpi object is an ATA device
1184 *
1185 * If an acpi object has one of the ACPI ATA methods defined,
1186 * then we can safely call it an ATA device.
1187 */
1188bool acpi_ata_match(acpi_handle handle)
1189{
1190 return acpi_has_method(handle, "_GTF") ||
1191 acpi_has_method(handle, "_GTM") ||
1192 acpi_has_method(handle, "_STM") ||
1193 acpi_has_method(handle, "_SDD");
1194}
1195
1196/*
1197 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1198 *
1199 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1200 * then we can safely call it an ejectable drive bay
1201 */
1202bool acpi_bay_match(acpi_handle handle)
1203{
1204 acpi_handle phandle;
1205
1206 if (!acpi_has_method(handle, "_EJ0"))
1207 return false;
1208 if (acpi_ata_match(handle))
1209 return true;
1210 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1211 return false;
1212
1213 return acpi_ata_match(phandle);
1214}
1215
1216bool acpi_device_is_battery(struct acpi_device *adev)
1217{
1218 struct acpi_hardware_id *hwid;
1219
1220 list_for_each_entry(hwid, &adev->pnp.ids, list)
1221 if (!strcmp("PNP0C0A", hwid->id))
1222 return true;
1223
1224 return false;
1225}
1226
1227static bool is_ejectable_bay(struct acpi_device *adev)
1228{
1229 acpi_handle handle = adev->handle;
1230
1231 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1232 return true;
1233
1234 return acpi_bay_match(handle);
1235}
1236
1237/*
1238 * acpi_dock_match - see if an acpi object has a _DCK method
1239 */
1240bool acpi_dock_match(acpi_handle handle)
1241{
1242 return acpi_has_method(handle, "_DCK");
1243}
1244
1245static acpi_status
1246acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1247 void **return_value)
1248{
1249 long *cap = context;
1250
1251 if (acpi_has_method(handle, "_BCM") &&
1252 acpi_has_method(handle, "_BCL")) {
1253 acpi_handle_debug(handle, "Found generic backlight support\n");
1254 *cap |= ACPI_VIDEO_BACKLIGHT;
1255 /* We have backlight support, no need to scan further */
1256 return AE_CTRL_TERMINATE;
1257 }
1258 return 0;
1259}
1260
1261/* Returns true if the ACPI object is a video device which can be
1262 * handled by video.ko.
1263 * The device will get a Linux specific CID added in scan.c to
1264 * identify the device as an ACPI graphics device
1265 * Be aware that the graphics device may not be physically present
1266 * Use acpi_video_get_capabilities() to detect general ACPI video
1267 * capabilities of present cards
1268 */
1269long acpi_is_video_device(acpi_handle handle)
1270{
1271 long video_caps = 0;
1272
1273 /* Is this device able to support video switching ? */
1274 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1275 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1276
1277 /* Is this device able to retrieve a video ROM ? */
1278 if (acpi_has_method(handle, "_ROM"))
1279 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1280
1281 /* Is this device able to configure which video head to be POSTed ? */
1282 if (acpi_has_method(handle, "_VPO") &&
1283 acpi_has_method(handle, "_GPD") &&
1284 acpi_has_method(handle, "_SPD"))
1285 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1286
1287 /* Only check for backlight functionality if one of the above hit. */
1288 if (video_caps)
1289 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1290 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1291 &video_caps, NULL);
1292
1293 return video_caps;
1294}
1295EXPORT_SYMBOL(acpi_is_video_device);
1296
1297const char *acpi_device_hid(struct acpi_device *device)
1298{
1299 struct acpi_hardware_id *hid;
1300
1301 if (list_empty(&device->pnp.ids))
1302 return dummy_hid;
1303
1304 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1305 return hid->id;
1306}
1307EXPORT_SYMBOL(acpi_device_hid);
1308
1309static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1310{
1311 struct acpi_hardware_id *id;
1312
1313 id = kmalloc(sizeof(*id), GFP_KERNEL);
1314 if (!id)
1315 return;
1316
1317 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1318 if (!id->id) {
1319 kfree(id);
1320 return;
1321 }
1322
1323 list_add_tail(&id->list, &pnp->ids);
1324 pnp->type.hardware_id = 1;
1325}
1326
1327/*
1328 * Old IBM workstations have a DSDT bug wherein the SMBus object
1329 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1330 * prefix. Work around this.
1331 */
1332static bool acpi_ibm_smbus_match(acpi_handle handle)
1333{
1334 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1335 struct acpi_buffer path = { sizeof(node_name), node_name };
1336
1337 if (!dmi_name_in_vendors("IBM"))
1338 return false;
1339
1340 /* Look for SMBS object */
1341 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1342 strcmp("SMBS", path.pointer))
1343 return false;
1344
1345 /* Does it have the necessary (but misnamed) methods? */
1346 if (acpi_has_method(handle, "SBI") &&
1347 acpi_has_method(handle, "SBR") &&
1348 acpi_has_method(handle, "SBW"))
1349 return true;
1350
1351 return false;
1352}
1353
1354static bool acpi_object_is_system_bus(acpi_handle handle)
1355{
1356 acpi_handle tmp;
1357
1358 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1359 tmp == handle)
1360 return true;
1361 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1362 tmp == handle)
1363 return true;
1364
1365 return false;
1366}
1367
1368static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1369 int device_type)
1370{
1371 struct acpi_device_info *info = NULL;
1372 struct acpi_pnp_device_id_list *cid_list;
1373 int i;
1374
1375 switch (device_type) {
1376 case ACPI_BUS_TYPE_DEVICE:
1377 if (handle == ACPI_ROOT_OBJECT) {
1378 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1379 break;
1380 }
1381
1382 acpi_get_object_info(handle, &info);
1383 if (!info) {
1384 pr_err("%s: Error reading device info\n", __func__);
1385 return;
1386 }
1387
1388 if (info->valid & ACPI_VALID_HID) {
1389 acpi_add_id(pnp, info->hardware_id.string);
1390 pnp->type.platform_id = 1;
1391 }
1392 if (info->valid & ACPI_VALID_CID) {
1393 cid_list = &info->compatible_id_list;
1394 for (i = 0; i < cid_list->count; i++)
1395 acpi_add_id(pnp, cid_list->ids[i].string);
1396 }
1397 if (info->valid & ACPI_VALID_ADR) {
1398 pnp->bus_address = info->address;
1399 pnp->type.bus_address = 1;
1400 }
1401 if (info->valid & ACPI_VALID_UID)
1402 pnp->unique_id = kstrdup(info->unique_id.string,
1403 GFP_KERNEL);
1404 if (info->valid & ACPI_VALID_CLS)
1405 acpi_add_id(pnp, info->class_code.string);
1406
1407 kfree(info);
1408
1409 /*
1410 * Some devices don't reliably have _HIDs & _CIDs, so add
1411 * synthetic HIDs to make sure drivers can find them.
1412 */
1413 if (acpi_is_video_device(handle)) {
1414 acpi_add_id(pnp, ACPI_VIDEO_HID);
1415 pnp->type.backlight = 1;
1416 break;
1417 }
1418 if (acpi_bay_match(handle))
1419 acpi_add_id(pnp, ACPI_BAY_HID);
1420 else if (acpi_dock_match(handle))
1421 acpi_add_id(pnp, ACPI_DOCK_HID);
1422 else if (acpi_ibm_smbus_match(handle))
1423 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1424 else if (list_empty(&pnp->ids) &&
1425 acpi_object_is_system_bus(handle)) {
1426 /* \_SB, \_TZ, LNXSYBUS */
1427 acpi_add_id(pnp, ACPI_BUS_HID);
1428 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1429 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1430 }
1431
1432 break;
1433 case ACPI_BUS_TYPE_POWER:
1434 acpi_add_id(pnp, ACPI_POWER_HID);
1435 break;
1436 case ACPI_BUS_TYPE_PROCESSOR:
1437 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1438 break;
1439 case ACPI_BUS_TYPE_THERMAL:
1440 acpi_add_id(pnp, ACPI_THERMAL_HID);
1441 break;
1442 case ACPI_BUS_TYPE_POWER_BUTTON:
1443 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1444 break;
1445 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1446 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1447 break;
1448 case ACPI_BUS_TYPE_ECDT_EC:
1449 acpi_add_id(pnp, ACPI_ECDT_HID);
1450 break;
1451 }
1452}
1453
1454void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1455{
1456 struct acpi_hardware_id *id, *tmp;
1457
1458 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1459 kfree_const(id->id);
1460 kfree(id);
1461 }
1462 kfree(pnp->unique_id);
1463}
1464
1465/**
1466 * acpi_dma_supported - Check DMA support for the specified device.
1467 * @adev: The pointer to acpi device
1468 *
1469 * Return false if DMA is not supported. Otherwise, return true
1470 */
1471bool acpi_dma_supported(const struct acpi_device *adev)
1472{
1473 if (!adev)
1474 return false;
1475
1476 if (adev->flags.cca_seen)
1477 return true;
1478
1479 /*
1480 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1481 * DMA on "Intel platforms". Presumably that includes all x86 and
1482 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1483 */
1484 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1485 return true;
1486
1487 return false;
1488}
1489
1490/**
1491 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1492 * @adev: The pointer to acpi device
1493 *
1494 * Return enum dev_dma_attr.
1495 */
1496enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1497{
1498 if (!acpi_dma_supported(adev))
1499 return DEV_DMA_NOT_SUPPORTED;
1500
1501 if (adev->flags.coherent_dma)
1502 return DEV_DMA_COHERENT;
1503 else
1504 return DEV_DMA_NON_COHERENT;
1505}
1506
1507/**
1508 * acpi_dma_get_range() - Get device DMA parameters.
1509 *
1510 * @dev: device to configure
1511 * @map: pointer to DMA ranges result
1512 *
1513 * Evaluate DMA regions and return pointer to DMA regions on
1514 * parsing success; it does not update the passed in values on failure.
1515 *
1516 * Return 0 on success, < 0 on failure.
1517 */
1518int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1519{
1520 struct acpi_device *adev;
1521 LIST_HEAD(list);
1522 struct resource_entry *rentry;
1523 int ret;
1524 struct device *dma_dev = dev;
1525 struct bus_dma_region *r;
1526
1527 /*
1528 * Walk the device tree chasing an ACPI companion with a _DMA
1529 * object while we go. Stop if we find a device with an ACPI
1530 * companion containing a _DMA method.
1531 */
1532 do {
1533 adev = ACPI_COMPANION(dma_dev);
1534 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1535 break;
1536
1537 dma_dev = dma_dev->parent;
1538 } while (dma_dev);
1539
1540 if (!dma_dev)
1541 return -ENODEV;
1542
1543 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1544 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1545 return -EINVAL;
1546 }
1547
1548 ret = acpi_dev_get_dma_resources(adev, &list);
1549 if (ret > 0) {
1550 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1551 if (!r) {
1552 ret = -ENOMEM;
1553 goto out;
1554 }
1555
1556 *map = r;
1557
1558 list_for_each_entry(rentry, &list, node) {
1559 if (rentry->res->start >= rentry->res->end) {
1560 kfree(*map);
1561 *map = NULL;
1562 ret = -EINVAL;
1563 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1564 goto out;
1565 }
1566
1567 r->cpu_start = rentry->res->start;
1568 r->dma_start = rentry->res->start - rentry->offset;
1569 r->size = resource_size(rentry->res);
1570 r++;
1571 }
1572 }
1573 out:
1574 acpi_dev_free_resource_list(&list);
1575
1576 return ret >= 0 ? 0 : ret;
1577}
1578
1579#ifdef CONFIG_IOMMU_API
1580int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1581 struct fwnode_handle *fwnode,
1582 const struct iommu_ops *ops)
1583{
1584 int ret = iommu_fwspec_init(dev, fwnode, ops);
1585
1586 if (!ret)
1587 ret = iommu_fwspec_add_ids(dev, &id, 1);
1588
1589 return ret;
1590}
1591
1592static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1593{
1594 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1595
1596 return fwspec ? fwspec->ops : NULL;
1597}
1598
1599static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1600{
1601 int err;
1602 const struct iommu_ops *ops;
1603
1604 /* Serialise to make dev->iommu stable under our potential fwspec */
1605 mutex_lock(&iommu_probe_device_lock);
1606 /*
1607 * If we already translated the fwspec there is nothing left to do,
1608 * return the iommu_ops.
1609 */
1610 ops = acpi_iommu_fwspec_ops(dev);
1611 if (ops) {
1612 mutex_unlock(&iommu_probe_device_lock);
1613 return 0;
1614 }
1615
1616 err = iort_iommu_configure_id(dev, id_in);
1617 if (err && err != -EPROBE_DEFER)
1618 err = viot_iommu_configure(dev);
1619 mutex_unlock(&iommu_probe_device_lock);
1620
1621 /*
1622 * If we have reason to believe the IOMMU driver missed the initial
1623 * iommu_probe_device() call for dev, replay it to get things in order.
1624 */
1625 if (!err && dev->bus)
1626 err = iommu_probe_device(dev);
1627
1628 /* Ignore all other errors apart from EPROBE_DEFER */
1629 if (err == -EPROBE_DEFER) {
1630 return err;
1631 } else if (err) {
1632 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1633 return -ENODEV;
1634 }
1635 if (!acpi_iommu_fwspec_ops(dev))
1636 return -ENODEV;
1637 return 0;
1638}
1639
1640#else /* !CONFIG_IOMMU_API */
1641
1642int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1643 struct fwnode_handle *fwnode,
1644 const struct iommu_ops *ops)
1645{
1646 return -ENODEV;
1647}
1648
1649static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1650{
1651 return -ENODEV;
1652}
1653
1654#endif /* !CONFIG_IOMMU_API */
1655
1656/**
1657 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1658 * @dev: The pointer to the device
1659 * @attr: device dma attributes
1660 * @input_id: input device id const value pointer
1661 */
1662int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1663 const u32 *input_id)
1664{
1665 int ret;
1666
1667 if (attr == DEV_DMA_NOT_SUPPORTED) {
1668 set_dma_ops(dev, &dma_dummy_ops);
1669 return 0;
1670 }
1671
1672 acpi_arch_dma_setup(dev);
1673
1674 ret = acpi_iommu_configure_id(dev, input_id);
1675 if (ret == -EPROBE_DEFER)
1676 return -EPROBE_DEFER;
1677
1678 /*
1679 * Historically this routine doesn't fail driver probing due to errors
1680 * in acpi_iommu_configure_id()
1681 */
1682
1683 arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT);
1684
1685 return 0;
1686}
1687EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1688
1689static void acpi_init_coherency(struct acpi_device *adev)
1690{
1691 unsigned long long cca = 0;
1692 acpi_status status;
1693 struct acpi_device *parent = acpi_dev_parent(adev);
1694
1695 if (parent && parent->flags.cca_seen) {
1696 /*
1697 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1698 * already saw one.
1699 */
1700 adev->flags.cca_seen = 1;
1701 cca = parent->flags.coherent_dma;
1702 } else {
1703 status = acpi_evaluate_integer(adev->handle, "_CCA",
1704 NULL, &cca);
1705 if (ACPI_SUCCESS(status))
1706 adev->flags.cca_seen = 1;
1707 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1708 /*
1709 * If architecture does not specify that _CCA is
1710 * required for DMA-able devices (e.g. x86),
1711 * we default to _CCA=1.
1712 */
1713 cca = 1;
1714 else
1715 acpi_handle_debug(adev->handle,
1716 "ACPI device is missing _CCA.\n");
1717 }
1718
1719 adev->flags.coherent_dma = cca;
1720}
1721
1722static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1723{
1724 bool *is_serial_bus_slave_p = data;
1725
1726 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1727 return 1;
1728
1729 *is_serial_bus_slave_p = true;
1730
1731 /* no need to do more checking */
1732 return -1;
1733}
1734
1735static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1736{
1737 struct acpi_device *parent = acpi_dev_parent(device);
1738 static const struct acpi_device_id indirect_io_hosts[] = {
1739 {"HISI0191", 0},
1740 {}
1741 };
1742
1743 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1744}
1745
1746static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1747{
1748 struct list_head resource_list;
1749 bool is_serial_bus_slave = false;
1750 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1751 /*
1752 * These devices have multiple SerialBus resources and a client
1753 * device must be instantiated for each of them, each with
1754 * its own device id.
1755 * Normally we only instantiate one client device for the first
1756 * resource, using the ACPI HID as id. These special cases are handled
1757 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1758 * knows which client device id to use for each resource.
1759 */
1760 {"BSG1160", },
1761 {"BSG2150", },
1762 {"CSC3551", },
1763 {"CSC3554", },
1764 {"CSC3556", },
1765 {"CSC3557", },
1766 {"INT33FE", },
1767 {"INT3515", },
1768 /* Non-conforming _HID for Cirrus Logic already released */
1769 {"CLSA0100", },
1770 {"CLSA0101", },
1771 /*
1772 * Some ACPI devs contain SerialBus resources even though they are not
1773 * attached to a serial bus at all.
1774 */
1775 {ACPI_VIDEO_HID, },
1776 {"MSHW0028", },
1777 /*
1778 * HIDs of device with an UartSerialBusV2 resource for which userspace
1779 * expects a regular tty cdev to be created (instead of the in kernel
1780 * serdev) and which have a kernel driver which expects a platform_dev
1781 * such as the rfkill-gpio driver.
1782 */
1783 {"BCM4752", },
1784 {"LNV4752", },
1785 {}
1786 };
1787
1788 if (acpi_is_indirect_io_slave(device))
1789 return true;
1790
1791 /* Macs use device properties in lieu of _CRS resources */
1792 if (x86_apple_machine &&
1793 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1794 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1795 fwnode_property_present(&device->fwnode, "baud")))
1796 return true;
1797
1798 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1799 return false;
1800
1801 INIT_LIST_HEAD(&resource_list);
1802 acpi_dev_get_resources(device, &resource_list,
1803 acpi_check_serial_bus_slave,
1804 &is_serial_bus_slave);
1805 acpi_dev_free_resource_list(&resource_list);
1806
1807 return is_serial_bus_slave;
1808}
1809
1810void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1811 int type, void (*release)(struct device *))
1812{
1813 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1814
1815 INIT_LIST_HEAD(&device->pnp.ids);
1816 device->device_type = type;
1817 device->handle = handle;
1818 device->dev.parent = parent ? &parent->dev : NULL;
1819 device->dev.release = release;
1820 device->dev.bus = &acpi_bus_type;
1821 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1822 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1823 acpi_device_get_busid(device);
1824 acpi_set_pnp_ids(handle, &device->pnp, type);
1825 acpi_init_properties(device);
1826 acpi_bus_get_flags(device);
1827 device->flags.match_driver = false;
1828 device->flags.initialized = true;
1829 device->flags.enumeration_by_parent =
1830 acpi_device_enumeration_by_parent(device);
1831 acpi_device_clear_enumerated(device);
1832 device_initialize(&device->dev);
1833 dev_set_uevent_suppress(&device->dev, true);
1834 acpi_init_coherency(device);
1835}
1836
1837static void acpi_scan_dep_init(struct acpi_device *adev)
1838{
1839 struct acpi_dep_data *dep;
1840
1841 list_for_each_entry(dep, &acpi_dep_list, node) {
1842 if (dep->consumer == adev->handle) {
1843 if (dep->honor_dep)
1844 adev->flags.honor_deps = 1;
1845
1846 if (!dep->met)
1847 adev->dep_unmet++;
1848 }
1849 }
1850}
1851
1852void acpi_device_add_finalize(struct acpi_device *device)
1853{
1854 dev_set_uevent_suppress(&device->dev, false);
1855 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1856}
1857
1858static void acpi_scan_init_status(struct acpi_device *adev)
1859{
1860 if (acpi_bus_get_status(adev))
1861 acpi_set_device_status(adev, 0);
1862}
1863
1864static int acpi_add_single_object(struct acpi_device **child,
1865 acpi_handle handle, int type, bool dep_init)
1866{
1867 struct acpi_device *device;
1868 bool release_dep_lock = false;
1869 int result;
1870
1871 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1872 if (!device)
1873 return -ENOMEM;
1874
1875 acpi_init_device_object(device, handle, type, acpi_device_release);
1876 /*
1877 * Getting the status is delayed till here so that we can call
1878 * acpi_bus_get_status() and use its quirk handling. Note that
1879 * this must be done before the get power-/wakeup_dev-flags calls.
1880 */
1881 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1882 if (dep_init) {
1883 mutex_lock(&acpi_dep_list_lock);
1884 /*
1885 * Hold the lock until the acpi_tie_acpi_dev() call
1886 * below to prevent concurrent acpi_scan_clear_dep()
1887 * from deleting a dependency list entry without
1888 * updating dep_unmet for the device.
1889 */
1890 release_dep_lock = true;
1891 acpi_scan_dep_init(device);
1892 }
1893 acpi_scan_init_status(device);
1894 }
1895
1896 acpi_bus_get_power_flags(device);
1897 acpi_bus_get_wakeup_device_flags(device);
1898
1899 result = acpi_tie_acpi_dev(device);
1900
1901 if (release_dep_lock)
1902 mutex_unlock(&acpi_dep_list_lock);
1903
1904 if (!result)
1905 result = acpi_device_add(device);
1906
1907 if (result) {
1908 acpi_device_release(&device->dev);
1909 return result;
1910 }
1911
1912 acpi_power_add_remove_device(device, true);
1913 acpi_device_add_finalize(device);
1914
1915 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1916 dev_name(&device->dev), device->dev.parent ?
1917 dev_name(device->dev.parent) : "(null)");
1918
1919 *child = device;
1920 return 0;
1921}
1922
1923static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1924 void *context)
1925{
1926 struct resource *res = context;
1927
1928 if (acpi_dev_resource_memory(ares, res))
1929 return AE_CTRL_TERMINATE;
1930
1931 return AE_OK;
1932}
1933
1934static bool acpi_device_should_be_hidden(acpi_handle handle)
1935{
1936 acpi_status status;
1937 struct resource res;
1938
1939 /* Check if it should ignore the UART device */
1940 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1941 return false;
1942
1943 /*
1944 * The UART device described in SPCR table is assumed to have only one
1945 * memory resource present. So we only look for the first one here.
1946 */
1947 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1948 acpi_get_resource_memory, &res);
1949 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1950 return false;
1951
1952 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1953 &res.start);
1954
1955 return true;
1956}
1957
1958bool acpi_device_is_present(const struct acpi_device *adev)
1959{
1960 return adev->status.present || adev->status.functional;
1961}
1962
1963bool acpi_device_is_enabled(const struct acpi_device *adev)
1964{
1965 return adev->status.present && adev->status.enabled;
1966}
1967
1968static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1969 const char *idstr,
1970 const struct acpi_device_id **matchid)
1971{
1972 const struct acpi_device_id *devid;
1973
1974 if (handler->match)
1975 return handler->match(idstr, matchid);
1976
1977 for (devid = handler->ids; devid->id[0]; devid++)
1978 if (!strcmp((char *)devid->id, idstr)) {
1979 if (matchid)
1980 *matchid = devid;
1981
1982 return true;
1983 }
1984
1985 return false;
1986}
1987
1988static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1989 const struct acpi_device_id **matchid)
1990{
1991 struct acpi_scan_handler *handler;
1992
1993 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1994 if (acpi_scan_handler_matching(handler, idstr, matchid))
1995 return handler;
1996
1997 return NULL;
1998}
1999
2000void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2001{
2002 if (!!hotplug->enabled == !!val)
2003 return;
2004
2005 mutex_lock(&acpi_scan_lock);
2006
2007 hotplug->enabled = val;
2008
2009 mutex_unlock(&acpi_scan_lock);
2010}
2011
2012static void acpi_scan_init_hotplug(struct acpi_device *adev)
2013{
2014 struct acpi_hardware_id *hwid;
2015
2016 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2017 acpi_dock_add(adev);
2018 return;
2019 }
2020 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2021 struct acpi_scan_handler *handler;
2022
2023 handler = acpi_scan_match_handler(hwid->id, NULL);
2024 if (handler) {
2025 adev->flags.hotplug_notify = true;
2026 break;
2027 }
2028 }
2029}
2030
2031static u32 acpi_scan_check_dep(acpi_handle handle)
2032{
2033 struct acpi_handle_list dep_devices;
2034 u32 count;
2035 int i;
2036
2037 /*
2038 * Check for _HID here to avoid deferring the enumeration of:
2039 * 1. PCI devices.
2040 * 2. ACPI nodes describing USB ports.
2041 * Still, checking for _HID catches more then just these cases ...
2042 */
2043 if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
2044 return 0;
2045
2046 if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
2047 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
2048 return 0;
2049 }
2050
2051 for (count = 0, i = 0; i < dep_devices.count; i++) {
2052 struct acpi_device_info *info;
2053 struct acpi_dep_data *dep;
2054 bool skip, honor_dep;
2055 acpi_status status;
2056
2057 status = acpi_get_object_info(dep_devices.handles[i], &info);
2058 if (ACPI_FAILURE(status)) {
2059 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2060 continue;
2061 }
2062
2063 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2064 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2065 kfree(info);
2066
2067 if (skip)
2068 continue;
2069
2070 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2071 if (!dep)
2072 continue;
2073
2074 count++;
2075
2076 dep->supplier = dep_devices.handles[i];
2077 dep->consumer = handle;
2078 dep->honor_dep = honor_dep;
2079
2080 mutex_lock(&acpi_dep_list_lock);
2081 list_add_tail(&dep->node , &acpi_dep_list);
2082 mutex_unlock(&acpi_dep_list_lock);
2083 }
2084
2085 acpi_handle_list_free(&dep_devices);
2086 return count;
2087}
2088
2089static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)
2090{
2091 acpi_mipi_check_crs_csi2(handle);
2092 return AE_OK;
2093}
2094
2095static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,
2096 struct acpi_device **adev_p)
2097{
2098 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2099 acpi_object_type acpi_type;
2100 int type;
2101
2102 if (device)
2103 goto out;
2104
2105 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2106 return AE_OK;
2107
2108 switch (acpi_type) {
2109 case ACPI_TYPE_DEVICE:
2110 if (acpi_device_should_be_hidden(handle))
2111 return AE_OK;
2112
2113 if (first_pass) {
2114 acpi_mipi_check_crs_csi2(handle);
2115
2116 /* Bail out if there are dependencies. */
2117 if (acpi_scan_check_dep(handle) > 0) {
2118 /*
2119 * The entire CSI-2 connection graph needs to be
2120 * extracted before any drivers or scan handlers
2121 * are bound to struct device objects, so scan
2122 * _CRS CSI-2 resource descriptors for all
2123 * devices below the current handle.
2124 */
2125 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
2126 ACPI_UINT32_MAX,
2127 acpi_scan_check_crs_csi2_cb,
2128 NULL, NULL, NULL);
2129 return AE_CTRL_DEPTH;
2130 }
2131 }
2132
2133 fallthrough;
2134 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2135 type = ACPI_BUS_TYPE_DEVICE;
2136 break;
2137
2138 case ACPI_TYPE_PROCESSOR:
2139 type = ACPI_BUS_TYPE_PROCESSOR;
2140 break;
2141
2142 case ACPI_TYPE_THERMAL:
2143 type = ACPI_BUS_TYPE_THERMAL;
2144 break;
2145
2146 case ACPI_TYPE_POWER:
2147 acpi_add_power_resource(handle);
2148 fallthrough;
2149 default:
2150 return AE_OK;
2151 }
2152
2153 /*
2154 * If first_pass is true at this point, the device has no dependencies,
2155 * or the creation of the device object would have been postponed above.
2156 */
2157 acpi_add_single_object(&device, handle, type, !first_pass);
2158 if (!device)
2159 return AE_CTRL_DEPTH;
2160
2161 acpi_scan_init_hotplug(device);
2162
2163out:
2164 if (!*adev_p)
2165 *adev_p = device;
2166
2167 return AE_OK;
2168}
2169
2170static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2171 void *not_used, void **ret_p)
2172{
2173 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2174}
2175
2176static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2177 void *not_used, void **ret_p)
2178{
2179 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2180}
2181
2182static void acpi_default_enumeration(struct acpi_device *device)
2183{
2184 /*
2185 * Do not enumerate devices with enumeration_by_parent flag set as
2186 * they will be enumerated by their respective parents.
2187 */
2188 if (!device->flags.enumeration_by_parent) {
2189 acpi_create_platform_device(device, NULL);
2190 acpi_device_set_enumerated(device);
2191 } else {
2192 blocking_notifier_call_chain(&acpi_reconfig_chain,
2193 ACPI_RECONFIG_DEVICE_ADD, device);
2194 }
2195}
2196
2197static const struct acpi_device_id generic_device_ids[] = {
2198 {ACPI_DT_NAMESPACE_HID, },
2199 {"", },
2200};
2201
2202static int acpi_generic_device_attach(struct acpi_device *adev,
2203 const struct acpi_device_id *not_used)
2204{
2205 /*
2206 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2207 * below can be unconditional.
2208 */
2209 if (adev->data.of_compatible)
2210 acpi_default_enumeration(adev);
2211
2212 return 1;
2213}
2214
2215static struct acpi_scan_handler generic_device_handler = {
2216 .ids = generic_device_ids,
2217 .attach = acpi_generic_device_attach,
2218};
2219
2220static int acpi_scan_attach_handler(struct acpi_device *device)
2221{
2222 struct acpi_hardware_id *hwid;
2223 int ret = 0;
2224
2225 list_for_each_entry(hwid, &device->pnp.ids, list) {
2226 const struct acpi_device_id *devid;
2227 struct acpi_scan_handler *handler;
2228
2229 handler = acpi_scan_match_handler(hwid->id, &devid);
2230 if (handler) {
2231 if (!handler->attach) {
2232 device->pnp.type.platform_id = 0;
2233 continue;
2234 }
2235 device->handler = handler;
2236 ret = handler->attach(device, devid);
2237 if (ret > 0)
2238 break;
2239
2240 device->handler = NULL;
2241 if (ret < 0)
2242 break;
2243 }
2244 }
2245
2246 return ret;
2247}
2248
2249static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2250{
2251 bool skip = !first_pass && device->flags.visited;
2252 acpi_handle ejd;
2253 int ret;
2254
2255 if (skip)
2256 goto ok;
2257
2258 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2259 register_dock_dependent_device(device, ejd);
2260
2261 acpi_bus_get_status(device);
2262 /* Skip devices that are not ready for enumeration (e.g. not present) */
2263 if (!acpi_dev_ready_for_enumeration(device)) {
2264 device->flags.initialized = false;
2265 acpi_device_clear_enumerated(device);
2266 device->flags.power_manageable = 0;
2267 return 0;
2268 }
2269 if (device->handler)
2270 goto ok;
2271
2272 if (!device->flags.initialized) {
2273 device->flags.power_manageable =
2274 device->power.states[ACPI_STATE_D0].flags.valid;
2275 if (acpi_bus_init_power(device))
2276 device->flags.power_manageable = 0;
2277
2278 device->flags.initialized = true;
2279 } else if (device->flags.visited) {
2280 goto ok;
2281 }
2282
2283 ret = acpi_scan_attach_handler(device);
2284 if (ret < 0)
2285 return 0;
2286
2287 device->flags.match_driver = true;
2288 if (ret > 0 && !device->flags.enumeration_by_parent) {
2289 acpi_device_set_enumerated(device);
2290 goto ok;
2291 }
2292
2293 ret = device_attach(&device->dev);
2294 if (ret < 0)
2295 return 0;
2296
2297 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2298 acpi_default_enumeration(device);
2299 else
2300 acpi_device_set_enumerated(device);
2301
2302ok:
2303 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2304
2305 if (!skip && device->handler && device->handler->hotplug.notify_online)
2306 device->handler->hotplug.notify_online(device);
2307
2308 return 0;
2309}
2310
2311static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2312{
2313 struct acpi_device **adev_p = data;
2314 struct acpi_device *adev = *adev_p;
2315
2316 /*
2317 * If we're passed a 'previous' consumer device then we need to skip
2318 * any consumers until we meet the previous one, and then NULL @data
2319 * so the next one can be returned.
2320 */
2321 if (adev) {
2322 if (dep->consumer == adev->handle)
2323 *adev_p = NULL;
2324
2325 return 0;
2326 }
2327
2328 adev = acpi_get_acpi_dev(dep->consumer);
2329 if (adev) {
2330 *(struct acpi_device **)data = adev;
2331 return 1;
2332 }
2333 /* Continue parsing if the device object is not present. */
2334 return 0;
2335}
2336
2337struct acpi_scan_clear_dep_work {
2338 struct work_struct work;
2339 struct acpi_device *adev;
2340};
2341
2342static void acpi_scan_clear_dep_fn(struct work_struct *work)
2343{
2344 struct acpi_scan_clear_dep_work *cdw;
2345
2346 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2347
2348 acpi_scan_lock_acquire();
2349 acpi_bus_attach(cdw->adev, (void *)true);
2350 acpi_scan_lock_release();
2351
2352 acpi_dev_put(cdw->adev);
2353 kfree(cdw);
2354}
2355
2356static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2357{
2358 struct acpi_scan_clear_dep_work *cdw;
2359
2360 if (adev->dep_unmet)
2361 return false;
2362
2363 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2364 if (!cdw)
2365 return false;
2366
2367 cdw->adev = adev;
2368 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2369 /*
2370 * Since the work function may block on the lock until the entire
2371 * initial enumeration of devices is complete, put it into the unbound
2372 * workqueue.
2373 */
2374 queue_work(system_unbound_wq, &cdw->work);
2375
2376 return true;
2377}
2378
2379static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
2380{
2381 list_del(&dep->node);
2382 kfree(dep);
2383}
2384
2385static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2386{
2387 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2388
2389 if (adev) {
2390 adev->dep_unmet--;
2391 if (!acpi_scan_clear_dep_queue(adev))
2392 acpi_dev_put(adev);
2393 }
2394
2395 if (dep->free_when_met)
2396 acpi_scan_delete_dep_data(dep);
2397 else
2398 dep->met = true;
2399
2400 return 0;
2401}
2402
2403/**
2404 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2405 * @handle: The ACPI handle of the supplier device
2406 * @callback: Pointer to the callback function to apply
2407 * @data: Pointer to some data to pass to the callback
2408 *
2409 * The return value of the callback determines this function's behaviour. If 0
2410 * is returned we continue to iterate over acpi_dep_list. If a positive value
2411 * is returned then the loop is broken but this function returns 0. If a
2412 * negative value is returned by the callback then the loop is broken and that
2413 * value is returned as the final error.
2414 */
2415static int acpi_walk_dep_device_list(acpi_handle handle,
2416 int (*callback)(struct acpi_dep_data *, void *),
2417 void *data)
2418{
2419 struct acpi_dep_data *dep, *tmp;
2420 int ret = 0;
2421
2422 mutex_lock(&acpi_dep_list_lock);
2423 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2424 if (dep->supplier == handle) {
2425 ret = callback(dep, data);
2426 if (ret)
2427 break;
2428 }
2429 }
2430 mutex_unlock(&acpi_dep_list_lock);
2431
2432 return ret > 0 ? 0 : ret;
2433}
2434
2435/**
2436 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2437 * @supplier: Pointer to the supplier &struct acpi_device
2438 *
2439 * Clear dependencies on the given device.
2440 */
2441void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2442{
2443 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2444}
2445EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2446
2447/**
2448 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2449 * @device: Pointer to the &struct acpi_device to check
2450 *
2451 * Check if the device is present and has no unmet dependencies.
2452 *
2453 * Return true if the device is ready for enumeratino. Otherwise, return false.
2454 */
2455bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2456{
2457 if (device->flags.honor_deps && device->dep_unmet)
2458 return false;
2459
2460 return acpi_device_is_present(device);
2461}
2462EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2463
2464/**
2465 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2466 * @supplier: Pointer to the dependee device
2467 * @start: Pointer to the current dependent device
2468 *
2469 * Returns the next &struct acpi_device which declares itself dependent on
2470 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2471 *
2472 * If the returned adev is not passed as @start to this function, the caller is
2473 * responsible for putting the reference to adev when it is no longer needed.
2474 */
2475struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2476 struct acpi_device *start)
2477{
2478 struct acpi_device *adev = start;
2479
2480 acpi_walk_dep_device_list(supplier->handle,
2481 acpi_dev_get_next_consumer_dev_cb, &adev);
2482
2483 acpi_dev_put(start);
2484
2485 if (adev == start)
2486 return NULL;
2487
2488 return adev;
2489}
2490EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2491
2492static void acpi_scan_postponed_branch(acpi_handle handle)
2493{
2494 struct acpi_device *adev = NULL;
2495
2496 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
2497 return;
2498
2499 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2500 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
2501
2502 /*
2503 * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that
2504 * have been added above.
2505 */
2506 acpi_mipi_init_crs_csi2_swnodes();
2507
2508 acpi_bus_attach(adev, NULL);
2509}
2510
2511static void acpi_scan_postponed(void)
2512{
2513 struct acpi_dep_data *dep, *tmp;
2514
2515 mutex_lock(&acpi_dep_list_lock);
2516
2517 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2518 acpi_handle handle = dep->consumer;
2519
2520 /*
2521 * In case there are multiple acpi_dep_list entries with the
2522 * same consumer, skip the current entry if the consumer device
2523 * object corresponding to it is present already.
2524 */
2525 if (!acpi_fetch_acpi_dev(handle)) {
2526 /*
2527 * Even though the lock is released here, tmp is
2528 * guaranteed to be valid, because none of the list
2529 * entries following dep is marked as "free when met"
2530 * and so they cannot be deleted.
2531 */
2532 mutex_unlock(&acpi_dep_list_lock);
2533
2534 acpi_scan_postponed_branch(handle);
2535
2536 mutex_lock(&acpi_dep_list_lock);
2537 }
2538
2539 if (dep->met)
2540 acpi_scan_delete_dep_data(dep);
2541 else
2542 dep->free_when_met = true;
2543 }
2544
2545 mutex_unlock(&acpi_dep_list_lock);
2546}
2547
2548/**
2549 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2550 * @handle: Root of the namespace scope to scan.
2551 *
2552 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2553 * found devices.
2554 *
2555 * If no devices were found, -ENODEV is returned, but it does not mean that
2556 * there has been a real error. There just have been no suitable ACPI objects
2557 * in the table trunk from which the kernel could create a device and add an
2558 * appropriate driver.
2559 *
2560 * Must be called under acpi_scan_lock.
2561 */
2562int acpi_bus_scan(acpi_handle handle)
2563{
2564 struct acpi_device *device = NULL;
2565
2566 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2567
2568 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2569 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2570 acpi_bus_check_add_1, NULL, NULL,
2571 (void **)&device);
2572
2573 if (!device)
2574 return -ENODEV;
2575
2576 /*
2577 * Set up ACPI _CRS CSI-2 software nodes using information extracted
2578 * from the _CRS CSI-2 resource descriptors during the ACPI namespace
2579 * walk above and MIPI DisCo for Imaging device properties.
2580 */
2581 acpi_mipi_scan_crs_csi2();
2582 acpi_mipi_init_crs_csi2_swnodes();
2583
2584 acpi_bus_attach(device, (void *)true);
2585
2586 /* Pass 2: Enumerate all of the remaining devices. */
2587
2588 acpi_scan_postponed();
2589
2590 acpi_mipi_crs_csi2_cleanup();
2591
2592 return 0;
2593}
2594EXPORT_SYMBOL(acpi_bus_scan);
2595
2596/**
2597 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2598 * @adev: Root of the ACPI namespace scope to walk.
2599 *
2600 * Must be called under acpi_scan_lock.
2601 */
2602void acpi_bus_trim(struct acpi_device *adev)
2603{
2604 acpi_scan_check_and_detach(adev, NULL);
2605}
2606EXPORT_SYMBOL_GPL(acpi_bus_trim);
2607
2608int acpi_bus_register_early_device(int type)
2609{
2610 struct acpi_device *device = NULL;
2611 int result;
2612
2613 result = acpi_add_single_object(&device, NULL, type, false);
2614 if (result)
2615 return result;
2616
2617 device->flags.match_driver = true;
2618 return device_attach(&device->dev);
2619}
2620EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2621
2622static void acpi_bus_scan_fixed(void)
2623{
2624 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2625 struct acpi_device *adev = NULL;
2626
2627 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2628 false);
2629 if (adev) {
2630 adev->flags.match_driver = true;
2631 if (device_attach(&adev->dev) >= 0)
2632 device_init_wakeup(&adev->dev, true);
2633 else
2634 dev_dbg(&adev->dev, "No driver\n");
2635 }
2636 }
2637
2638 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2639 struct acpi_device *adev = NULL;
2640
2641 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2642 false);
2643 if (adev) {
2644 adev->flags.match_driver = true;
2645 if (device_attach(&adev->dev) < 0)
2646 dev_dbg(&adev->dev, "No driver\n");
2647 }
2648 }
2649}
2650
2651static void __init acpi_get_spcr_uart_addr(void)
2652{
2653 acpi_status status;
2654 struct acpi_table_spcr *spcr_ptr;
2655
2656 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2657 (struct acpi_table_header **)&spcr_ptr);
2658 if (ACPI_FAILURE(status)) {
2659 pr_warn("STAO table present, but SPCR is missing\n");
2660 return;
2661 }
2662
2663 spcr_uart_addr = spcr_ptr->serial_port.address;
2664 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2665}
2666
2667static bool acpi_scan_initialized;
2668
2669void __init acpi_scan_init(void)
2670{
2671 acpi_status status;
2672 struct acpi_table_stao *stao_ptr;
2673
2674 acpi_pci_root_init();
2675 acpi_pci_link_init();
2676 acpi_processor_init();
2677 acpi_platform_init();
2678 acpi_lpss_init();
2679 acpi_apd_init();
2680 acpi_cmos_rtc_init();
2681 acpi_container_init();
2682 acpi_memory_hotplug_init();
2683 acpi_watchdog_init();
2684 acpi_pnp_init();
2685 acpi_int340x_thermal_init();
2686 acpi_init_lpit();
2687
2688 acpi_scan_add_handler(&generic_device_handler);
2689
2690 /*
2691 * If there is STAO table, check whether it needs to ignore the UART
2692 * device in SPCR table.
2693 */
2694 status = acpi_get_table(ACPI_SIG_STAO, 0,
2695 (struct acpi_table_header **)&stao_ptr);
2696 if (ACPI_SUCCESS(status)) {
2697 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2698 pr_info("STAO Name List not yet supported.\n");
2699
2700 if (stao_ptr->ignore_uart)
2701 acpi_get_spcr_uart_addr();
2702
2703 acpi_put_table((struct acpi_table_header *)stao_ptr);
2704 }
2705
2706 acpi_gpe_apply_masked_gpes();
2707 acpi_update_all_gpes();
2708
2709 /*
2710 * Although we call __add_memory() that is documented to require the
2711 * device_hotplug_lock, it is not necessary here because this is an
2712 * early code when userspace or any other code path cannot trigger
2713 * hotplug/hotunplug operations.
2714 */
2715 mutex_lock(&acpi_scan_lock);
2716 /*
2717 * Enumerate devices in the ACPI namespace.
2718 */
2719 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2720 goto unlock;
2721
2722 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2723 if (!acpi_root)
2724 goto unlock;
2725
2726 /* Fixed feature devices do not exist on HW-reduced platform */
2727 if (!acpi_gbl_reduced_hardware)
2728 acpi_bus_scan_fixed();
2729
2730 acpi_turn_off_unused_power_resources();
2731
2732 acpi_scan_initialized = true;
2733
2734unlock:
2735 mutex_unlock(&acpi_scan_lock);
2736}
2737
2738static struct acpi_probe_entry *ape;
2739static int acpi_probe_count;
2740static DEFINE_MUTEX(acpi_probe_mutex);
2741
2742static int __init acpi_match_madt(union acpi_subtable_headers *header,
2743 const unsigned long end)
2744{
2745 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2746 if (!ape->probe_subtbl(header, end))
2747 acpi_probe_count++;
2748
2749 return 0;
2750}
2751
2752int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2753{
2754 int count = 0;
2755
2756 if (acpi_disabled)
2757 return 0;
2758
2759 mutex_lock(&acpi_probe_mutex);
2760 for (ape = ap_head; nr; ape++, nr--) {
2761 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2762 acpi_probe_count = 0;
2763 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2764 count += acpi_probe_count;
2765 } else {
2766 int res;
2767 res = acpi_table_parse(ape->id, ape->probe_table);
2768 if (!res)
2769 count++;
2770 }
2771 }
2772 mutex_unlock(&acpi_probe_mutex);
2773
2774 return count;
2775}
2776
2777static void acpi_table_events_fn(struct work_struct *work)
2778{
2779 acpi_scan_lock_acquire();
2780 acpi_bus_scan(ACPI_ROOT_OBJECT);
2781 acpi_scan_lock_release();
2782
2783 kfree(work);
2784}
2785
2786void acpi_scan_table_notify(void)
2787{
2788 struct work_struct *work;
2789
2790 if (!acpi_scan_initialized)
2791 return;
2792
2793 work = kmalloc(sizeof(*work), GFP_KERNEL);
2794 if (!work)
2795 return;
2796
2797 INIT_WORK(work, acpi_table_events_fn);
2798 schedule_work(work);
2799}
2800
2801int acpi_reconfig_notifier_register(struct notifier_block *nb)
2802{
2803 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2804}
2805EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2806
2807int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2808{
2809 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2810}
2811EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);