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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/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <linux/acpi.h>
10#include <linux/acpi_iort.h>
11#include <linux/signal.h>
12#include <linux/kthread.h>
13#include <linux/dmi.h>
14#include <linux/nls.h>
15#include <linux/dma-mapping.h>
16
17#include <asm/pgtable.h>
18
19#include "internal.h"
20
21#define _COMPONENT ACPI_BUS_COMPONENT
22ACPI_MODULE_NAME("scan");
23extern struct acpi_device *acpi_root;
24
25#define ACPI_BUS_CLASS "system_bus"
26#define ACPI_BUS_HID "LNXSYBUS"
27#define ACPI_BUS_DEVICE_NAME "System Bus"
28
29#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
30
31#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
32
33/*
34 * If set, devices will be hot-removed even if they cannot be put offline
35 * gracefully (from the kernel's standpoint).
36 */
37bool acpi_force_hot_remove;
38
39static const char *dummy_hid = "device";
40
41static LIST_HEAD(acpi_dep_list);
42static DEFINE_MUTEX(acpi_dep_list_lock);
43LIST_HEAD(acpi_bus_id_list);
44static DEFINE_MUTEX(acpi_scan_lock);
45static LIST_HEAD(acpi_scan_handlers_list);
46DEFINE_MUTEX(acpi_device_lock);
47LIST_HEAD(acpi_wakeup_device_list);
48static DEFINE_MUTEX(acpi_hp_context_lock);
49
50/*
51 * The UART device described by the SPCR table is the only object which needs
52 * special-casing. Everything else is covered by ACPI namespace paths in STAO
53 * table.
54 */
55static u64 spcr_uart_addr;
56
57struct acpi_dep_data {
58 struct list_head node;
59 acpi_handle master;
60 acpi_handle slave;
61};
62
63void acpi_scan_lock_acquire(void)
64{
65 mutex_lock(&acpi_scan_lock);
66}
67EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
68
69void acpi_scan_lock_release(void)
70{
71 mutex_unlock(&acpi_scan_lock);
72}
73EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
74
75void acpi_lock_hp_context(void)
76{
77 mutex_lock(&acpi_hp_context_lock);
78}
79
80void acpi_unlock_hp_context(void)
81{
82 mutex_unlock(&acpi_hp_context_lock);
83}
84
85void acpi_initialize_hp_context(struct acpi_device *adev,
86 struct acpi_hotplug_context *hp,
87 int (*notify)(struct acpi_device *, u32),
88 void (*uevent)(struct acpi_device *, u32))
89{
90 acpi_lock_hp_context();
91 hp->notify = notify;
92 hp->uevent = uevent;
93 acpi_set_hp_context(adev, hp);
94 acpi_unlock_hp_context();
95}
96EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
97
98int acpi_scan_add_handler(struct acpi_scan_handler *handler)
99{
100 if (!handler)
101 return -EINVAL;
102
103 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
104 return 0;
105}
106
107int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
108 const char *hotplug_profile_name)
109{
110 int error;
111
112 error = acpi_scan_add_handler(handler);
113 if (error)
114 return error;
115
116 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
117 return 0;
118}
119
120bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
121{
122 struct acpi_device_physical_node *pn;
123 bool offline = true;
124
125 /*
126 * acpi_container_offline() calls this for all of the container's
127 * children under the container's physical_node_lock lock.
128 */
129 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
130
131 list_for_each_entry(pn, &adev->physical_node_list, node)
132 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
133 if (uevent)
134 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
135
136 offline = false;
137 break;
138 }
139
140 mutex_unlock(&adev->physical_node_lock);
141 return offline;
142}
143
144static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
145 void **ret_p)
146{
147 struct acpi_device *device = NULL;
148 struct acpi_device_physical_node *pn;
149 bool second_pass = (bool)data;
150 acpi_status status = AE_OK;
151
152 if (acpi_bus_get_device(handle, &device))
153 return AE_OK;
154
155 if (device->handler && !device->handler->hotplug.enabled) {
156 *ret_p = &device->dev;
157 return AE_SUPPORT;
158 }
159
160 mutex_lock(&device->physical_node_lock);
161
162 list_for_each_entry(pn, &device->physical_node_list, node) {
163 int ret;
164
165 if (second_pass) {
166 /* Skip devices offlined by the first pass. */
167 if (pn->put_online)
168 continue;
169 } else {
170 pn->put_online = false;
171 }
172 ret = device_offline(pn->dev);
173 if (acpi_force_hot_remove)
174 continue;
175
176 if (ret >= 0) {
177 pn->put_online = !ret;
178 } else {
179 *ret_p = pn->dev;
180 if (second_pass) {
181 status = AE_ERROR;
182 break;
183 }
184 }
185 }
186
187 mutex_unlock(&device->physical_node_lock);
188
189 return status;
190}
191
192static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
193 void **ret_p)
194{
195 struct acpi_device *device = NULL;
196 struct acpi_device_physical_node *pn;
197
198 if (acpi_bus_get_device(handle, &device))
199 return AE_OK;
200
201 mutex_lock(&device->physical_node_lock);
202
203 list_for_each_entry(pn, &device->physical_node_list, node)
204 if (pn->put_online) {
205 device_online(pn->dev);
206 pn->put_online = false;
207 }
208
209 mutex_unlock(&device->physical_node_lock);
210
211 return AE_OK;
212}
213
214static int acpi_scan_try_to_offline(struct acpi_device *device)
215{
216 acpi_handle handle = device->handle;
217 struct device *errdev = NULL;
218 acpi_status status;
219
220 /*
221 * Carry out two passes here and ignore errors in the first pass,
222 * because if the devices in question are memory blocks and
223 * CONFIG_MEMCG is set, one of the blocks may hold data structures
224 * that the other blocks depend on, but it is not known in advance which
225 * block holds them.
226 *
227 * If the first pass is successful, the second one isn't needed, though.
228 */
229 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
230 NULL, acpi_bus_offline, (void *)false,
231 (void **)&errdev);
232 if (status == AE_SUPPORT) {
233 dev_warn(errdev, "Offline disabled.\n");
234 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
235 acpi_bus_online, NULL, NULL, NULL);
236 return -EPERM;
237 }
238 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
239 if (errdev) {
240 errdev = NULL;
241 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
242 NULL, acpi_bus_offline, (void *)true,
243 (void **)&errdev);
244 if (!errdev || acpi_force_hot_remove)
245 acpi_bus_offline(handle, 0, (void *)true,
246 (void **)&errdev);
247
248 if (errdev && !acpi_force_hot_remove) {
249 dev_warn(errdev, "Offline failed.\n");
250 acpi_bus_online(handle, 0, NULL, NULL);
251 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
252 ACPI_UINT32_MAX, acpi_bus_online,
253 NULL, NULL, NULL);
254 return -EBUSY;
255 }
256 }
257 return 0;
258}
259
260static int acpi_scan_hot_remove(struct acpi_device *device)
261{
262 acpi_handle handle = device->handle;
263 unsigned long long sta;
264 acpi_status status;
265
266 if (device->handler && device->handler->hotplug.demand_offline
267 && !acpi_force_hot_remove) {
268 if (!acpi_scan_is_offline(device, true))
269 return -EBUSY;
270 } else {
271 int error = acpi_scan_try_to_offline(device);
272 if (error)
273 return error;
274 }
275
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277 "Hot-removing device %s...\n", dev_name(&device->dev)));
278
279 acpi_bus_trim(device);
280
281 acpi_evaluate_lck(handle, 0);
282 /*
283 * TBD: _EJD support.
284 */
285 status = acpi_evaluate_ej0(handle);
286 if (status == AE_NOT_FOUND)
287 return -ENODEV;
288 else if (ACPI_FAILURE(status))
289 return -EIO;
290
291 /*
292 * Verify if eject was indeed successful. If not, log an error
293 * message. No need to call _OST since _EJ0 call was made OK.
294 */
295 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
296 if (ACPI_FAILURE(status)) {
297 acpi_handle_warn(handle,
298 "Status check after eject failed (0x%x)\n", status);
299 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
300 acpi_handle_warn(handle,
301 "Eject incomplete - status 0x%llx\n", sta);
302 }
303
304 return 0;
305}
306
307static int acpi_scan_device_not_present(struct acpi_device *adev)
308{
309 if (!acpi_device_enumerated(adev)) {
310 dev_warn(&adev->dev, "Still not present\n");
311 return -EALREADY;
312 }
313 acpi_bus_trim(adev);
314 return 0;
315}
316
317static int acpi_scan_device_check(struct acpi_device *adev)
318{
319 int error;
320
321 acpi_bus_get_status(adev);
322 if (adev->status.present || adev->status.functional) {
323 /*
324 * This function is only called for device objects for which
325 * matching scan handlers exist. The only situation in which
326 * the scan handler is not attached to this device object yet
327 * is when the device has just appeared (either it wasn't
328 * present at all before or it was removed and then added
329 * again).
330 */
331 if (adev->handler) {
332 dev_warn(&adev->dev, "Already enumerated\n");
333 return -EALREADY;
334 }
335 error = acpi_bus_scan(adev->handle);
336 if (error) {
337 dev_warn(&adev->dev, "Namespace scan failure\n");
338 return error;
339 }
340 if (!adev->handler) {
341 dev_warn(&adev->dev, "Enumeration failure\n");
342 error = -ENODEV;
343 }
344 } else {
345 error = acpi_scan_device_not_present(adev);
346 }
347 return error;
348}
349
350static int acpi_scan_bus_check(struct acpi_device *adev)
351{
352 struct acpi_scan_handler *handler = adev->handler;
353 struct acpi_device *child;
354 int error;
355
356 acpi_bus_get_status(adev);
357 if (!(adev->status.present || adev->status.functional)) {
358 acpi_scan_device_not_present(adev);
359 return 0;
360 }
361 if (handler && handler->hotplug.scan_dependent)
362 return handler->hotplug.scan_dependent(adev);
363
364 error = acpi_bus_scan(adev->handle);
365 if (error) {
366 dev_warn(&adev->dev, "Namespace scan failure\n");
367 return error;
368 }
369 list_for_each_entry(child, &adev->children, node) {
370 error = acpi_scan_bus_check(child);
371 if (error)
372 return error;
373 }
374 return 0;
375}
376
377static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
378{
379 switch (type) {
380 case ACPI_NOTIFY_BUS_CHECK:
381 return acpi_scan_bus_check(adev);
382 case ACPI_NOTIFY_DEVICE_CHECK:
383 return acpi_scan_device_check(adev);
384 case ACPI_NOTIFY_EJECT_REQUEST:
385 case ACPI_OST_EC_OSPM_EJECT:
386 if (adev->handler && !adev->handler->hotplug.enabled) {
387 dev_info(&adev->dev, "Eject disabled\n");
388 return -EPERM;
389 }
390 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
391 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
392 return acpi_scan_hot_remove(adev);
393 }
394 return -EINVAL;
395}
396
397void acpi_device_hotplug(struct acpi_device *adev, u32 src)
398{
399 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
400 int error = -ENODEV;
401
402 lock_device_hotplug();
403 mutex_lock(&acpi_scan_lock);
404
405 /*
406 * The device object's ACPI handle cannot become invalid as long as we
407 * are holding acpi_scan_lock, but it might have become invalid before
408 * that lock was acquired.
409 */
410 if (adev->handle == INVALID_ACPI_HANDLE)
411 goto err_out;
412
413 if (adev->flags.is_dock_station) {
414 error = dock_notify(adev, src);
415 } else if (adev->flags.hotplug_notify) {
416 error = acpi_generic_hotplug_event(adev, src);
417 if (error == -EPERM) {
418 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
419 goto err_out;
420 }
421 } else {
422 int (*notify)(struct acpi_device *, u32);
423
424 acpi_lock_hp_context();
425 notify = adev->hp ? adev->hp->notify : NULL;
426 acpi_unlock_hp_context();
427 /*
428 * There may be additional notify handlers for device objects
429 * without the .event() callback, so ignore them here.
430 */
431 if (notify)
432 error = notify(adev, src);
433 else
434 goto out;
435 }
436 if (!error)
437 ost_code = ACPI_OST_SC_SUCCESS;
438
439 err_out:
440 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
441
442 out:
443 acpi_bus_put_acpi_device(adev);
444 mutex_unlock(&acpi_scan_lock);
445 unlock_device_hotplug();
446}
447
448static void acpi_free_power_resources_lists(struct acpi_device *device)
449{
450 int i;
451
452 if (device->wakeup.flags.valid)
453 acpi_power_resources_list_free(&device->wakeup.resources);
454
455 if (!device->power.flags.power_resources)
456 return;
457
458 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
459 struct acpi_device_power_state *ps = &device->power.states[i];
460 acpi_power_resources_list_free(&ps->resources);
461 }
462}
463
464static void acpi_device_release(struct device *dev)
465{
466 struct acpi_device *acpi_dev = to_acpi_device(dev);
467
468 acpi_free_properties(acpi_dev);
469 acpi_free_pnp_ids(&acpi_dev->pnp);
470 acpi_free_power_resources_lists(acpi_dev);
471 kfree(acpi_dev);
472}
473
474static void acpi_device_del(struct acpi_device *device)
475{
476 struct acpi_device_bus_id *acpi_device_bus_id;
477
478 mutex_lock(&acpi_device_lock);
479 if (device->parent)
480 list_del(&device->node);
481
482 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
483 if (!strcmp(acpi_device_bus_id->bus_id,
484 acpi_device_hid(device))) {
485 if (acpi_device_bus_id->instance_no > 0)
486 acpi_device_bus_id->instance_no--;
487 else {
488 list_del(&acpi_device_bus_id->node);
489 kfree(acpi_device_bus_id);
490 }
491 break;
492 }
493
494 list_del(&device->wakeup_list);
495 mutex_unlock(&acpi_device_lock);
496
497 acpi_power_add_remove_device(device, false);
498 acpi_device_remove_files(device);
499 if (device->remove)
500 device->remove(device);
501
502 device_del(&device->dev);
503}
504
505static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
506
507static LIST_HEAD(acpi_device_del_list);
508static DEFINE_MUTEX(acpi_device_del_lock);
509
510static void acpi_device_del_work_fn(struct work_struct *work_not_used)
511{
512 for (;;) {
513 struct acpi_device *adev;
514
515 mutex_lock(&acpi_device_del_lock);
516
517 if (list_empty(&acpi_device_del_list)) {
518 mutex_unlock(&acpi_device_del_lock);
519 break;
520 }
521 adev = list_first_entry(&acpi_device_del_list,
522 struct acpi_device, del_list);
523 list_del(&adev->del_list);
524
525 mutex_unlock(&acpi_device_del_lock);
526
527 blocking_notifier_call_chain(&acpi_reconfig_chain,
528 ACPI_RECONFIG_DEVICE_REMOVE, adev);
529
530 acpi_device_del(adev);
531 /*
532 * Drop references to all power resources that might have been
533 * used by the device.
534 */
535 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
536 put_device(&adev->dev);
537 }
538}
539
540/**
541 * acpi_scan_drop_device - Drop an ACPI device object.
542 * @handle: Handle of an ACPI namespace node, not used.
543 * @context: Address of the ACPI device object to drop.
544 *
545 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
546 * namespace node the device object pointed to by @context is attached to.
547 *
548 * The unregistration is carried out asynchronously to avoid running
549 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
550 * ensure the correct ordering (the device objects must be unregistered in the
551 * same order in which the corresponding namespace nodes are deleted).
552 */
553static void acpi_scan_drop_device(acpi_handle handle, void *context)
554{
555 static DECLARE_WORK(work, acpi_device_del_work_fn);
556 struct acpi_device *adev = context;
557
558 mutex_lock(&acpi_device_del_lock);
559
560 /*
561 * Use the ACPI hotplug workqueue which is ordered, so this work item
562 * won't run after any hotplug work items submitted subsequently. That
563 * prevents attempts to register device objects identical to those being
564 * deleted from happening concurrently (such attempts result from
565 * hotplug events handled via the ACPI hotplug workqueue). It also will
566 * run after all of the work items submitted previosuly, which helps
567 * those work items to ensure that they are not accessing stale device
568 * objects.
569 */
570 if (list_empty(&acpi_device_del_list))
571 acpi_queue_hotplug_work(&work);
572
573 list_add_tail(&adev->del_list, &acpi_device_del_list);
574 /* Make acpi_ns_validate_handle() return NULL for this handle. */
575 adev->handle = INVALID_ACPI_HANDLE;
576
577 mutex_unlock(&acpi_device_del_lock);
578}
579
580static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
581 void (*callback)(void *))
582{
583 acpi_status status;
584
585 if (!device)
586 return -EINVAL;
587
588 status = acpi_get_data_full(handle, acpi_scan_drop_device,
589 (void **)device, callback);
590 if (ACPI_FAILURE(status) || !*device) {
591 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
592 handle));
593 return -ENODEV;
594 }
595 return 0;
596}
597
598int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
599{
600 return acpi_get_device_data(handle, device, NULL);
601}
602EXPORT_SYMBOL(acpi_bus_get_device);
603
604static void get_acpi_device(void *dev)
605{
606 if (dev)
607 get_device(&((struct acpi_device *)dev)->dev);
608}
609
610struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
611{
612 struct acpi_device *adev = NULL;
613
614 acpi_get_device_data(handle, &adev, get_acpi_device);
615 return adev;
616}
617
618void acpi_bus_put_acpi_device(struct acpi_device *adev)
619{
620 put_device(&adev->dev);
621}
622
623int acpi_device_add(struct acpi_device *device,
624 void (*release)(struct device *))
625{
626 int result;
627 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
628 int found = 0;
629
630 if (device->handle) {
631 acpi_status status;
632
633 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
634 device);
635 if (ACPI_FAILURE(status)) {
636 acpi_handle_err(device->handle,
637 "Unable to attach device data\n");
638 return -ENODEV;
639 }
640 }
641
642 /*
643 * Linkage
644 * -------
645 * Link this device to its parent and siblings.
646 */
647 INIT_LIST_HEAD(&device->children);
648 INIT_LIST_HEAD(&device->node);
649 INIT_LIST_HEAD(&device->wakeup_list);
650 INIT_LIST_HEAD(&device->physical_node_list);
651 INIT_LIST_HEAD(&device->del_list);
652 mutex_init(&device->physical_node_lock);
653
654 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
655 if (!new_bus_id) {
656 pr_err(PREFIX "Memory allocation error\n");
657 result = -ENOMEM;
658 goto err_detach;
659 }
660
661 mutex_lock(&acpi_device_lock);
662 /*
663 * Find suitable bus_id and instance number in acpi_bus_id_list
664 * If failed, create one and link it into acpi_bus_id_list
665 */
666 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
667 if (!strcmp(acpi_device_bus_id->bus_id,
668 acpi_device_hid(device))) {
669 acpi_device_bus_id->instance_no++;
670 found = 1;
671 kfree(new_bus_id);
672 break;
673 }
674 }
675 if (!found) {
676 acpi_device_bus_id = new_bus_id;
677 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
678 acpi_device_bus_id->instance_no = 0;
679 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
680 }
681 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
682
683 if (device->parent)
684 list_add_tail(&device->node, &device->parent->children);
685
686 if (device->wakeup.flags.valid)
687 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
688 mutex_unlock(&acpi_device_lock);
689
690 if (device->parent)
691 device->dev.parent = &device->parent->dev;
692 device->dev.bus = &acpi_bus_type;
693 device->dev.release = release;
694 result = device_add(&device->dev);
695 if (result) {
696 dev_err(&device->dev, "Error registering device\n");
697 goto err;
698 }
699
700 result = acpi_device_setup_files(device);
701 if (result)
702 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
703 dev_name(&device->dev));
704
705 return 0;
706
707 err:
708 mutex_lock(&acpi_device_lock);
709 if (device->parent)
710 list_del(&device->node);
711 list_del(&device->wakeup_list);
712 mutex_unlock(&acpi_device_lock);
713
714 err_detach:
715 acpi_detach_data(device->handle, acpi_scan_drop_device);
716 return result;
717}
718
719/* --------------------------------------------------------------------------
720 Device Enumeration
721 -------------------------------------------------------------------------- */
722static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
723{
724 struct acpi_device *device = NULL;
725 acpi_status status;
726
727 /*
728 * Fixed hardware devices do not appear in the namespace and do not
729 * have handles, but we fabricate acpi_devices for them, so we have
730 * to deal with them specially.
731 */
732 if (!handle)
733 return acpi_root;
734
735 do {
736 status = acpi_get_parent(handle, &handle);
737 if (ACPI_FAILURE(status))
738 return status == AE_NULL_ENTRY ? NULL : acpi_root;
739 } while (acpi_bus_get_device(handle, &device));
740 return device;
741}
742
743acpi_status
744acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
745{
746 acpi_status status;
747 acpi_handle tmp;
748 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
749 union acpi_object *obj;
750
751 status = acpi_get_handle(handle, "_EJD", &tmp);
752 if (ACPI_FAILURE(status))
753 return status;
754
755 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
756 if (ACPI_SUCCESS(status)) {
757 obj = buffer.pointer;
758 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
759 ejd);
760 kfree(buffer.pointer);
761 }
762 return status;
763}
764EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
765
766static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
767 struct acpi_device_wakeup *wakeup)
768{
769 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
770 union acpi_object *package = NULL;
771 union acpi_object *element = NULL;
772 acpi_status status;
773 int err = -ENODATA;
774
775 if (!wakeup)
776 return -EINVAL;
777
778 INIT_LIST_HEAD(&wakeup->resources);
779
780 /* _PRW */
781 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
782 if (ACPI_FAILURE(status)) {
783 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
784 return err;
785 }
786
787 package = (union acpi_object *)buffer.pointer;
788
789 if (!package || package->package.count < 2)
790 goto out;
791
792 element = &(package->package.elements[0]);
793 if (!element)
794 goto out;
795
796 if (element->type == ACPI_TYPE_PACKAGE) {
797 if ((element->package.count < 2) ||
798 (element->package.elements[0].type !=
799 ACPI_TYPE_LOCAL_REFERENCE)
800 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
801 goto out;
802
803 wakeup->gpe_device =
804 element->package.elements[0].reference.handle;
805 wakeup->gpe_number =
806 (u32) element->package.elements[1].integer.value;
807 } else if (element->type == ACPI_TYPE_INTEGER) {
808 wakeup->gpe_device = NULL;
809 wakeup->gpe_number = element->integer.value;
810 } else {
811 goto out;
812 }
813
814 element = &(package->package.elements[1]);
815 if (element->type != ACPI_TYPE_INTEGER)
816 goto out;
817
818 wakeup->sleep_state = element->integer.value;
819
820 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
821 if (err)
822 goto out;
823
824 if (!list_empty(&wakeup->resources)) {
825 int sleep_state;
826
827 err = acpi_power_wakeup_list_init(&wakeup->resources,
828 &sleep_state);
829 if (err) {
830 acpi_handle_warn(handle, "Retrieving current states "
831 "of wakeup power resources failed\n");
832 acpi_power_resources_list_free(&wakeup->resources);
833 goto out;
834 }
835 if (sleep_state < wakeup->sleep_state) {
836 acpi_handle_warn(handle, "Overriding _PRW sleep state "
837 "(S%d) by S%d from power resources\n",
838 (int)wakeup->sleep_state, sleep_state);
839 wakeup->sleep_state = sleep_state;
840 }
841 }
842
843 out:
844 kfree(buffer.pointer);
845 return err;
846}
847
848static void acpi_wakeup_gpe_init(struct acpi_device *device)
849{
850 static const struct acpi_device_id button_device_ids[] = {
851 {"PNP0C0C", 0},
852 {"PNP0C0D", 0},
853 {"PNP0C0E", 0},
854 {"", 0},
855 };
856 struct acpi_device_wakeup *wakeup = &device->wakeup;
857 acpi_status status;
858 acpi_event_status event_status;
859
860 wakeup->flags.notifier_present = 0;
861
862 /* Power button, Lid switch always enable wakeup */
863 if (!acpi_match_device_ids(device, button_device_ids)) {
864 wakeup->flags.run_wake = 1;
865 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
866 /* Do not use Lid/sleep button for S5 wakeup */
867 if (wakeup->sleep_state == ACPI_STATE_S5)
868 wakeup->sleep_state = ACPI_STATE_S4;
869 }
870 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
871 device_set_wakeup_capable(&device->dev, true);
872 return;
873 }
874
875 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
876 wakeup->gpe_number);
877 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
878 &event_status);
879 if (ACPI_FAILURE(status))
880 return;
881
882 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
883}
884
885static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
886{
887 int err;
888
889 /* Presence of _PRW indicates wake capable */
890 if (!acpi_has_method(device->handle, "_PRW"))
891 return;
892
893 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
894 &device->wakeup);
895 if (err) {
896 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
897 return;
898 }
899
900 device->wakeup.flags.valid = 1;
901 device->wakeup.prepare_count = 0;
902 acpi_wakeup_gpe_init(device);
903 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
904 * system for the ACPI device with the _PRW object.
905 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
906 * So it is necessary to call _DSW object first. Only when it is not
907 * present will the _PSW object used.
908 */
909 err = acpi_device_sleep_wake(device, 0, 0, 0);
910 if (err)
911 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
912 "error in _DSW or _PSW evaluation\n"));
913}
914
915static void acpi_bus_init_power_state(struct acpi_device *device, int state)
916{
917 struct acpi_device_power_state *ps = &device->power.states[state];
918 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
919 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
920 acpi_status status;
921
922 INIT_LIST_HEAD(&ps->resources);
923
924 /* Evaluate "_PRx" to get referenced power resources */
925 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
926 if (ACPI_SUCCESS(status)) {
927 union acpi_object *package = buffer.pointer;
928
929 if (buffer.length && package
930 && package->type == ACPI_TYPE_PACKAGE
931 && package->package.count) {
932 int err = acpi_extract_power_resources(package, 0,
933 &ps->resources);
934 if (!err)
935 device->power.flags.power_resources = 1;
936 }
937 ACPI_FREE(buffer.pointer);
938 }
939
940 /* Evaluate "_PSx" to see if we can do explicit sets */
941 pathname[2] = 'S';
942 if (acpi_has_method(device->handle, pathname))
943 ps->flags.explicit_set = 1;
944
945 /* State is valid if there are means to put the device into it. */
946 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
947 ps->flags.valid = 1;
948
949 ps->power = -1; /* Unknown - driver assigned */
950 ps->latency = -1; /* Unknown - driver assigned */
951}
952
953static void acpi_bus_get_power_flags(struct acpi_device *device)
954{
955 u32 i;
956
957 /* Presence of _PS0|_PR0 indicates 'power manageable' */
958 if (!acpi_has_method(device->handle, "_PS0") &&
959 !acpi_has_method(device->handle, "_PR0"))
960 return;
961
962 device->flags.power_manageable = 1;
963
964 /*
965 * Power Management Flags
966 */
967 if (acpi_has_method(device->handle, "_PSC"))
968 device->power.flags.explicit_get = 1;
969
970 if (acpi_has_method(device->handle, "_IRC"))
971 device->power.flags.inrush_current = 1;
972
973 if (acpi_has_method(device->handle, "_DSW"))
974 device->power.flags.dsw_present = 1;
975
976 /*
977 * Enumerate supported power management states
978 */
979 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
980 acpi_bus_init_power_state(device, i);
981
982 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
983 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
984 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
985
986 /* Set defaults for D0 and D3hot states (always valid) */
987 device->power.states[ACPI_STATE_D0].flags.valid = 1;
988 device->power.states[ACPI_STATE_D0].power = 100;
989 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
990
991 if (acpi_bus_init_power(device))
992 device->flags.power_manageable = 0;
993}
994
995static void acpi_bus_get_flags(struct acpi_device *device)
996{
997 /* Presence of _STA indicates 'dynamic_status' */
998 if (acpi_has_method(device->handle, "_STA"))
999 device->flags.dynamic_status = 1;
1000
1001 /* Presence of _RMV indicates 'removable' */
1002 if (acpi_has_method(device->handle, "_RMV"))
1003 device->flags.removable = 1;
1004
1005 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1006 if (acpi_has_method(device->handle, "_EJD") ||
1007 acpi_has_method(device->handle, "_EJ0"))
1008 device->flags.ejectable = 1;
1009}
1010
1011static void acpi_device_get_busid(struct acpi_device *device)
1012{
1013 char bus_id[5] = { '?', 0 };
1014 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1015 int i = 0;
1016
1017 /*
1018 * Bus ID
1019 * ------
1020 * The device's Bus ID is simply the object name.
1021 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1022 */
1023 if (ACPI_IS_ROOT_DEVICE(device)) {
1024 strcpy(device->pnp.bus_id, "ACPI");
1025 return;
1026 }
1027
1028 switch (device->device_type) {
1029 case ACPI_BUS_TYPE_POWER_BUTTON:
1030 strcpy(device->pnp.bus_id, "PWRF");
1031 break;
1032 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1033 strcpy(device->pnp.bus_id, "SLPF");
1034 break;
1035 default:
1036 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1037 /* Clean up trailing underscores (if any) */
1038 for (i = 3; i > 1; i--) {
1039 if (bus_id[i] == '_')
1040 bus_id[i] = '\0';
1041 else
1042 break;
1043 }
1044 strcpy(device->pnp.bus_id, bus_id);
1045 break;
1046 }
1047}
1048
1049/*
1050 * acpi_ata_match - see if an acpi object is an ATA device
1051 *
1052 * If an acpi object has one of the ACPI ATA methods defined,
1053 * then we can safely call it an ATA device.
1054 */
1055bool acpi_ata_match(acpi_handle handle)
1056{
1057 return acpi_has_method(handle, "_GTF") ||
1058 acpi_has_method(handle, "_GTM") ||
1059 acpi_has_method(handle, "_STM") ||
1060 acpi_has_method(handle, "_SDD");
1061}
1062
1063/*
1064 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1065 *
1066 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1067 * then we can safely call it an ejectable drive bay
1068 */
1069bool acpi_bay_match(acpi_handle handle)
1070{
1071 acpi_handle phandle;
1072
1073 if (!acpi_has_method(handle, "_EJ0"))
1074 return false;
1075 if (acpi_ata_match(handle))
1076 return true;
1077 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1078 return false;
1079
1080 return acpi_ata_match(phandle);
1081}
1082
1083bool acpi_device_is_battery(struct acpi_device *adev)
1084{
1085 struct acpi_hardware_id *hwid;
1086
1087 list_for_each_entry(hwid, &adev->pnp.ids, list)
1088 if (!strcmp("PNP0C0A", hwid->id))
1089 return true;
1090
1091 return false;
1092}
1093
1094static bool is_ejectable_bay(struct acpi_device *adev)
1095{
1096 acpi_handle handle = adev->handle;
1097
1098 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1099 return true;
1100
1101 return acpi_bay_match(handle);
1102}
1103
1104/*
1105 * acpi_dock_match - see if an acpi object has a _DCK method
1106 */
1107bool acpi_dock_match(acpi_handle handle)
1108{
1109 return acpi_has_method(handle, "_DCK");
1110}
1111
1112static acpi_status
1113acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1114 void **return_value)
1115{
1116 long *cap = context;
1117
1118 if (acpi_has_method(handle, "_BCM") &&
1119 acpi_has_method(handle, "_BCL")) {
1120 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1121 "support\n"));
1122 *cap |= ACPI_VIDEO_BACKLIGHT;
1123 /* We have backlight support, no need to scan further */
1124 return AE_CTRL_TERMINATE;
1125 }
1126 return 0;
1127}
1128
1129/* Returns true if the ACPI object is a video device which can be
1130 * handled by video.ko.
1131 * The device will get a Linux specific CID added in scan.c to
1132 * identify the device as an ACPI graphics device
1133 * Be aware that the graphics device may not be physically present
1134 * Use acpi_video_get_capabilities() to detect general ACPI video
1135 * capabilities of present cards
1136 */
1137long acpi_is_video_device(acpi_handle handle)
1138{
1139 long video_caps = 0;
1140
1141 /* Is this device able to support video switching ? */
1142 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1143 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1144
1145 /* Is this device able to retrieve a video ROM ? */
1146 if (acpi_has_method(handle, "_ROM"))
1147 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1148
1149 /* Is this device able to configure which video head to be POSTed ? */
1150 if (acpi_has_method(handle, "_VPO") &&
1151 acpi_has_method(handle, "_GPD") &&
1152 acpi_has_method(handle, "_SPD"))
1153 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1154
1155 /* Only check for backlight functionality if one of the above hit. */
1156 if (video_caps)
1157 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1158 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1159 &video_caps, NULL);
1160
1161 return video_caps;
1162}
1163EXPORT_SYMBOL(acpi_is_video_device);
1164
1165const char *acpi_device_hid(struct acpi_device *device)
1166{
1167 struct acpi_hardware_id *hid;
1168
1169 if (list_empty(&device->pnp.ids))
1170 return dummy_hid;
1171
1172 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1173 return hid->id;
1174}
1175EXPORT_SYMBOL(acpi_device_hid);
1176
1177static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1178{
1179 struct acpi_hardware_id *id;
1180
1181 id = kmalloc(sizeof(*id), GFP_KERNEL);
1182 if (!id)
1183 return;
1184
1185 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1186 if (!id->id) {
1187 kfree(id);
1188 return;
1189 }
1190
1191 list_add_tail(&id->list, &pnp->ids);
1192 pnp->type.hardware_id = 1;
1193}
1194
1195/*
1196 * Old IBM workstations have a DSDT bug wherein the SMBus object
1197 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1198 * prefix. Work around this.
1199 */
1200static bool acpi_ibm_smbus_match(acpi_handle handle)
1201{
1202 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1203 struct acpi_buffer path = { sizeof(node_name), node_name };
1204
1205 if (!dmi_name_in_vendors("IBM"))
1206 return false;
1207
1208 /* Look for SMBS object */
1209 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1210 strcmp("SMBS", path.pointer))
1211 return false;
1212
1213 /* Does it have the necessary (but misnamed) methods? */
1214 if (acpi_has_method(handle, "SBI") &&
1215 acpi_has_method(handle, "SBR") &&
1216 acpi_has_method(handle, "SBW"))
1217 return true;
1218
1219 return false;
1220}
1221
1222static bool acpi_object_is_system_bus(acpi_handle handle)
1223{
1224 acpi_handle tmp;
1225
1226 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1227 tmp == handle)
1228 return true;
1229 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1230 tmp == handle)
1231 return true;
1232
1233 return false;
1234}
1235
1236static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1237 int device_type)
1238{
1239 acpi_status status;
1240 struct acpi_device_info *info;
1241 struct acpi_pnp_device_id_list *cid_list;
1242 int i;
1243
1244 switch (device_type) {
1245 case ACPI_BUS_TYPE_DEVICE:
1246 if (handle == ACPI_ROOT_OBJECT) {
1247 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1248 break;
1249 }
1250
1251 status = acpi_get_object_info(handle, &info);
1252 if (ACPI_FAILURE(status)) {
1253 pr_err(PREFIX "%s: Error reading device info\n",
1254 __func__);
1255 return;
1256 }
1257
1258 if (info->valid & ACPI_VALID_HID) {
1259 acpi_add_id(pnp, info->hardware_id.string);
1260 pnp->type.platform_id = 1;
1261 }
1262 if (info->valid & ACPI_VALID_CID) {
1263 cid_list = &info->compatible_id_list;
1264 for (i = 0; i < cid_list->count; i++)
1265 acpi_add_id(pnp, cid_list->ids[i].string);
1266 }
1267 if (info->valid & ACPI_VALID_ADR) {
1268 pnp->bus_address = info->address;
1269 pnp->type.bus_address = 1;
1270 }
1271 if (info->valid & ACPI_VALID_UID)
1272 pnp->unique_id = kstrdup(info->unique_id.string,
1273 GFP_KERNEL);
1274 if (info->valid & ACPI_VALID_CLS)
1275 acpi_add_id(pnp, info->class_code.string);
1276
1277 kfree(info);
1278
1279 /*
1280 * Some devices don't reliably have _HIDs & _CIDs, so add
1281 * synthetic HIDs to make sure drivers can find them.
1282 */
1283 if (acpi_is_video_device(handle))
1284 acpi_add_id(pnp, ACPI_VIDEO_HID);
1285 else if (acpi_bay_match(handle))
1286 acpi_add_id(pnp, ACPI_BAY_HID);
1287 else if (acpi_dock_match(handle))
1288 acpi_add_id(pnp, ACPI_DOCK_HID);
1289 else if (acpi_ibm_smbus_match(handle))
1290 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1291 else if (list_empty(&pnp->ids) &&
1292 acpi_object_is_system_bus(handle)) {
1293 /* \_SB, \_TZ, LNXSYBUS */
1294 acpi_add_id(pnp, ACPI_BUS_HID);
1295 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1296 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1297 }
1298
1299 break;
1300 case ACPI_BUS_TYPE_POWER:
1301 acpi_add_id(pnp, ACPI_POWER_HID);
1302 break;
1303 case ACPI_BUS_TYPE_PROCESSOR:
1304 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1305 break;
1306 case ACPI_BUS_TYPE_THERMAL:
1307 acpi_add_id(pnp, ACPI_THERMAL_HID);
1308 break;
1309 case ACPI_BUS_TYPE_POWER_BUTTON:
1310 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1311 break;
1312 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1313 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1314 break;
1315 }
1316}
1317
1318void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1319{
1320 struct acpi_hardware_id *id, *tmp;
1321
1322 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1323 kfree_const(id->id);
1324 kfree(id);
1325 }
1326 kfree(pnp->unique_id);
1327}
1328
1329/**
1330 * acpi_dma_supported - Check DMA support for the specified device.
1331 * @adev: The pointer to acpi device
1332 *
1333 * Return false if DMA is not supported. Otherwise, return true
1334 */
1335bool acpi_dma_supported(struct acpi_device *adev)
1336{
1337 if (!adev)
1338 return false;
1339
1340 if (adev->flags.cca_seen)
1341 return true;
1342
1343 /*
1344 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1345 * DMA on "Intel platforms". Presumably that includes all x86 and
1346 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1347 */
1348 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1349 return true;
1350
1351 return false;
1352}
1353
1354/**
1355 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1356 * @adev: The pointer to acpi device
1357 *
1358 * Return enum dev_dma_attr.
1359 */
1360enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1361{
1362 if (!acpi_dma_supported(adev))
1363 return DEV_DMA_NOT_SUPPORTED;
1364
1365 if (adev->flags.coherent_dma)
1366 return DEV_DMA_COHERENT;
1367 else
1368 return DEV_DMA_NON_COHERENT;
1369}
1370
1371/**
1372 * acpi_dma_configure - Set-up DMA configuration for the device.
1373 * @dev: The pointer to the device
1374 * @attr: device dma attributes
1375 */
1376void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1377{
1378 const struct iommu_ops *iommu;
1379
1380 iort_set_dma_mask(dev);
1381
1382 iommu = iort_iommu_configure(dev);
1383
1384 /*
1385 * Assume dma valid range starts at 0 and covers the whole
1386 * coherent_dma_mask.
1387 */
1388 arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, iommu,
1389 attr == DEV_DMA_COHERENT);
1390}
1391EXPORT_SYMBOL_GPL(acpi_dma_configure);
1392
1393/**
1394 * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1395 * @dev: The pointer to the device
1396 */
1397void acpi_dma_deconfigure(struct device *dev)
1398{
1399 arch_teardown_dma_ops(dev);
1400}
1401EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1402
1403static void acpi_init_coherency(struct acpi_device *adev)
1404{
1405 unsigned long long cca = 0;
1406 acpi_status status;
1407 struct acpi_device *parent = adev->parent;
1408
1409 if (parent && parent->flags.cca_seen) {
1410 /*
1411 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1412 * already saw one.
1413 */
1414 adev->flags.cca_seen = 1;
1415 cca = parent->flags.coherent_dma;
1416 } else {
1417 status = acpi_evaluate_integer(adev->handle, "_CCA",
1418 NULL, &cca);
1419 if (ACPI_SUCCESS(status))
1420 adev->flags.cca_seen = 1;
1421 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1422 /*
1423 * If architecture does not specify that _CCA is
1424 * required for DMA-able devices (e.g. x86),
1425 * we default to _CCA=1.
1426 */
1427 cca = 1;
1428 else
1429 acpi_handle_debug(adev->handle,
1430 "ACPI device is missing _CCA.\n");
1431 }
1432
1433 adev->flags.coherent_dma = cca;
1434}
1435
1436void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1437 int type, unsigned long long sta)
1438{
1439 INIT_LIST_HEAD(&device->pnp.ids);
1440 device->device_type = type;
1441 device->handle = handle;
1442 device->parent = acpi_bus_get_parent(handle);
1443 device->fwnode.type = FWNODE_ACPI;
1444 acpi_set_device_status(device, sta);
1445 acpi_device_get_busid(device);
1446 acpi_set_pnp_ids(handle, &device->pnp, type);
1447 acpi_init_properties(device);
1448 acpi_bus_get_flags(device);
1449 device->flags.match_driver = false;
1450 device->flags.initialized = true;
1451 acpi_device_clear_enumerated(device);
1452 device_initialize(&device->dev);
1453 dev_set_uevent_suppress(&device->dev, true);
1454 acpi_init_coherency(device);
1455}
1456
1457void acpi_device_add_finalize(struct acpi_device *device)
1458{
1459 dev_set_uevent_suppress(&device->dev, false);
1460 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1461}
1462
1463static int acpi_add_single_object(struct acpi_device **child,
1464 acpi_handle handle, int type,
1465 unsigned long long sta)
1466{
1467 int result;
1468 struct acpi_device *device;
1469 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1470
1471 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1472 if (!device) {
1473 printk(KERN_ERR PREFIX "Memory allocation error\n");
1474 return -ENOMEM;
1475 }
1476
1477 acpi_init_device_object(device, handle, type, sta);
1478 acpi_bus_get_power_flags(device);
1479 acpi_bus_get_wakeup_device_flags(device);
1480
1481 result = acpi_device_add(device, acpi_device_release);
1482 if (result) {
1483 acpi_device_release(&device->dev);
1484 return result;
1485 }
1486
1487 acpi_power_add_remove_device(device, true);
1488 acpi_device_add_finalize(device);
1489 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1490 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1491 dev_name(&device->dev), (char *) buffer.pointer,
1492 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1493 kfree(buffer.pointer);
1494 *child = device;
1495 return 0;
1496}
1497
1498static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1499 void *context)
1500{
1501 struct resource *res = context;
1502
1503 if (acpi_dev_resource_memory(ares, res))
1504 return AE_CTRL_TERMINATE;
1505
1506 return AE_OK;
1507}
1508
1509static bool acpi_device_should_be_hidden(acpi_handle handle)
1510{
1511 acpi_status status;
1512 struct resource res;
1513
1514 /* Check if it should ignore the UART device */
1515 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1516 return false;
1517
1518 /*
1519 * The UART device described in SPCR table is assumed to have only one
1520 * memory resource present. So we only look for the first one here.
1521 */
1522 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1523 acpi_get_resource_memory, &res);
1524 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1525 return false;
1526
1527 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1528 &res.start);
1529
1530 return true;
1531}
1532
1533static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1534 unsigned long long *sta)
1535{
1536 acpi_status status;
1537 acpi_object_type acpi_type;
1538
1539 status = acpi_get_type(handle, &acpi_type);
1540 if (ACPI_FAILURE(status))
1541 return -ENODEV;
1542
1543 switch (acpi_type) {
1544 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1545 case ACPI_TYPE_DEVICE:
1546 if (acpi_device_should_be_hidden(handle))
1547 return -ENODEV;
1548
1549 *type = ACPI_BUS_TYPE_DEVICE;
1550 status = acpi_bus_get_status_handle(handle, sta);
1551 if (ACPI_FAILURE(status))
1552 *sta = 0;
1553 break;
1554 case ACPI_TYPE_PROCESSOR:
1555 *type = ACPI_BUS_TYPE_PROCESSOR;
1556 status = acpi_bus_get_status_handle(handle, sta);
1557 if (ACPI_FAILURE(status))
1558 return -ENODEV;
1559 break;
1560 case ACPI_TYPE_THERMAL:
1561 *type = ACPI_BUS_TYPE_THERMAL;
1562 *sta = ACPI_STA_DEFAULT;
1563 break;
1564 case ACPI_TYPE_POWER:
1565 *type = ACPI_BUS_TYPE_POWER;
1566 *sta = ACPI_STA_DEFAULT;
1567 break;
1568 default:
1569 return -ENODEV;
1570 }
1571
1572 return 0;
1573}
1574
1575bool acpi_device_is_present(struct acpi_device *adev)
1576{
1577 if (adev->status.present || adev->status.functional)
1578 return true;
1579
1580 adev->flags.initialized = false;
1581 return false;
1582}
1583
1584static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1585 const char *idstr,
1586 const struct acpi_device_id **matchid)
1587{
1588 const struct acpi_device_id *devid;
1589
1590 if (handler->match)
1591 return handler->match(idstr, matchid);
1592
1593 for (devid = handler->ids; devid->id[0]; devid++)
1594 if (!strcmp((char *)devid->id, idstr)) {
1595 if (matchid)
1596 *matchid = devid;
1597
1598 return true;
1599 }
1600
1601 return false;
1602}
1603
1604static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1605 const struct acpi_device_id **matchid)
1606{
1607 struct acpi_scan_handler *handler;
1608
1609 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1610 if (acpi_scan_handler_matching(handler, idstr, matchid))
1611 return handler;
1612
1613 return NULL;
1614}
1615
1616void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1617{
1618 if (!!hotplug->enabled == !!val)
1619 return;
1620
1621 mutex_lock(&acpi_scan_lock);
1622
1623 hotplug->enabled = val;
1624
1625 mutex_unlock(&acpi_scan_lock);
1626}
1627
1628static void acpi_scan_init_hotplug(struct acpi_device *adev)
1629{
1630 struct acpi_hardware_id *hwid;
1631
1632 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1633 acpi_dock_add(adev);
1634 return;
1635 }
1636 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1637 struct acpi_scan_handler *handler;
1638
1639 handler = acpi_scan_match_handler(hwid->id, NULL);
1640 if (handler) {
1641 adev->flags.hotplug_notify = true;
1642 break;
1643 }
1644 }
1645}
1646
1647static void acpi_device_dep_initialize(struct acpi_device *adev)
1648{
1649 struct acpi_dep_data *dep;
1650 struct acpi_handle_list dep_devices;
1651 acpi_status status;
1652 int i;
1653
1654 if (!acpi_has_method(adev->handle, "_DEP"))
1655 return;
1656
1657 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1658 &dep_devices);
1659 if (ACPI_FAILURE(status)) {
1660 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1661 return;
1662 }
1663
1664 for (i = 0; i < dep_devices.count; i++) {
1665 struct acpi_device_info *info;
1666 int skip;
1667
1668 status = acpi_get_object_info(dep_devices.handles[i], &info);
1669 if (ACPI_FAILURE(status)) {
1670 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1671 continue;
1672 }
1673
1674 /*
1675 * Skip the dependency of Windows System Power
1676 * Management Controller
1677 */
1678 skip = info->valid & ACPI_VALID_HID &&
1679 !strcmp(info->hardware_id.string, "INT3396");
1680
1681 kfree(info);
1682
1683 if (skip)
1684 continue;
1685
1686 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1687 if (!dep)
1688 return;
1689
1690 dep->master = dep_devices.handles[i];
1691 dep->slave = adev->handle;
1692 adev->dep_unmet++;
1693
1694 mutex_lock(&acpi_dep_list_lock);
1695 list_add_tail(&dep->node , &acpi_dep_list);
1696 mutex_unlock(&acpi_dep_list_lock);
1697 }
1698}
1699
1700static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1701 void *not_used, void **return_value)
1702{
1703 struct acpi_device *device = NULL;
1704 int type;
1705 unsigned long long sta;
1706 int result;
1707
1708 acpi_bus_get_device(handle, &device);
1709 if (device)
1710 goto out;
1711
1712 result = acpi_bus_type_and_status(handle, &type, &sta);
1713 if (result)
1714 return AE_OK;
1715
1716 if (type == ACPI_BUS_TYPE_POWER) {
1717 acpi_add_power_resource(handle);
1718 return AE_OK;
1719 }
1720
1721 acpi_add_single_object(&device, handle, type, sta);
1722 if (!device)
1723 return AE_CTRL_DEPTH;
1724
1725 acpi_scan_init_hotplug(device);
1726 acpi_device_dep_initialize(device);
1727
1728 out:
1729 if (!*return_value)
1730 *return_value = device;
1731
1732 return AE_OK;
1733}
1734
1735static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1736{
1737 bool *is_spi_i2c_slave_p = data;
1738
1739 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1740 return 1;
1741
1742 /*
1743 * devices that are connected to UART still need to be enumerated to
1744 * platform bus
1745 */
1746 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1747 *is_spi_i2c_slave_p = true;
1748
1749 /* no need to do more checking */
1750 return -1;
1751}
1752
1753static void acpi_default_enumeration(struct acpi_device *device)
1754{
1755 struct list_head resource_list;
1756 bool is_spi_i2c_slave = false;
1757
1758 /*
1759 * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1760 * respective parents.
1761 */
1762 INIT_LIST_HEAD(&resource_list);
1763 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1764 &is_spi_i2c_slave);
1765 acpi_dev_free_resource_list(&resource_list);
1766 if (!is_spi_i2c_slave) {
1767 acpi_create_platform_device(device, NULL);
1768 acpi_device_set_enumerated(device);
1769 } else {
1770 blocking_notifier_call_chain(&acpi_reconfig_chain,
1771 ACPI_RECONFIG_DEVICE_ADD, device);
1772 }
1773}
1774
1775static const struct acpi_device_id generic_device_ids[] = {
1776 {ACPI_DT_NAMESPACE_HID, },
1777 {"", },
1778};
1779
1780static int acpi_generic_device_attach(struct acpi_device *adev,
1781 const struct acpi_device_id *not_used)
1782{
1783 /*
1784 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1785 * below can be unconditional.
1786 */
1787 if (adev->data.of_compatible)
1788 acpi_default_enumeration(adev);
1789
1790 return 1;
1791}
1792
1793static struct acpi_scan_handler generic_device_handler = {
1794 .ids = generic_device_ids,
1795 .attach = acpi_generic_device_attach,
1796};
1797
1798static int acpi_scan_attach_handler(struct acpi_device *device)
1799{
1800 struct acpi_hardware_id *hwid;
1801 int ret = 0;
1802
1803 list_for_each_entry(hwid, &device->pnp.ids, list) {
1804 const struct acpi_device_id *devid;
1805 struct acpi_scan_handler *handler;
1806
1807 handler = acpi_scan_match_handler(hwid->id, &devid);
1808 if (handler) {
1809 if (!handler->attach) {
1810 device->pnp.type.platform_id = 0;
1811 continue;
1812 }
1813 device->handler = handler;
1814 ret = handler->attach(device, devid);
1815 if (ret > 0)
1816 break;
1817
1818 device->handler = NULL;
1819 if (ret < 0)
1820 break;
1821 }
1822 }
1823
1824 return ret;
1825}
1826
1827static void acpi_bus_attach(struct acpi_device *device)
1828{
1829 struct acpi_device *child;
1830 acpi_handle ejd;
1831 int ret;
1832
1833 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1834 register_dock_dependent_device(device, ejd);
1835
1836 acpi_bus_get_status(device);
1837 /* Skip devices that are not present. */
1838 if (!acpi_device_is_present(device)) {
1839 acpi_device_clear_enumerated(device);
1840 device->flags.power_manageable = 0;
1841 return;
1842 }
1843 if (device->handler)
1844 goto ok;
1845
1846 if (!device->flags.initialized) {
1847 device->flags.power_manageable =
1848 device->power.states[ACPI_STATE_D0].flags.valid;
1849 if (acpi_bus_init_power(device))
1850 device->flags.power_manageable = 0;
1851
1852 device->flags.initialized = true;
1853 }
1854
1855 ret = acpi_scan_attach_handler(device);
1856 if (ret < 0)
1857 return;
1858
1859 device->flags.match_driver = true;
1860 if (!ret) {
1861 ret = device_attach(&device->dev);
1862 if (ret < 0)
1863 return;
1864
1865 if (!ret && device->pnp.type.platform_id)
1866 acpi_default_enumeration(device);
1867 }
1868
1869 ok:
1870 list_for_each_entry(child, &device->children, node)
1871 acpi_bus_attach(child);
1872
1873 if (device->handler && device->handler->hotplug.notify_online)
1874 device->handler->hotplug.notify_online(device);
1875}
1876
1877void acpi_walk_dep_device_list(acpi_handle handle)
1878{
1879 struct acpi_dep_data *dep, *tmp;
1880 struct acpi_device *adev;
1881
1882 mutex_lock(&acpi_dep_list_lock);
1883 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1884 if (dep->master == handle) {
1885 acpi_bus_get_device(dep->slave, &adev);
1886 if (!adev)
1887 continue;
1888
1889 adev->dep_unmet--;
1890 if (!adev->dep_unmet)
1891 acpi_bus_attach(adev);
1892 list_del(&dep->node);
1893 kfree(dep);
1894 }
1895 }
1896 mutex_unlock(&acpi_dep_list_lock);
1897}
1898EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1899
1900/**
1901 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1902 * @handle: Root of the namespace scope to scan.
1903 *
1904 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1905 * found devices.
1906 *
1907 * If no devices were found, -ENODEV is returned, but it does not mean that
1908 * there has been a real error. There just have been no suitable ACPI objects
1909 * in the table trunk from which the kernel could create a device and add an
1910 * appropriate driver.
1911 *
1912 * Must be called under acpi_scan_lock.
1913 */
1914int acpi_bus_scan(acpi_handle handle)
1915{
1916 void *device = NULL;
1917
1918 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1919 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1920 acpi_bus_check_add, NULL, NULL, &device);
1921
1922 if (device) {
1923 acpi_bus_attach(device);
1924 return 0;
1925 }
1926 return -ENODEV;
1927}
1928EXPORT_SYMBOL(acpi_bus_scan);
1929
1930/**
1931 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1932 * @adev: Root of the ACPI namespace scope to walk.
1933 *
1934 * Must be called under acpi_scan_lock.
1935 */
1936void acpi_bus_trim(struct acpi_device *adev)
1937{
1938 struct acpi_scan_handler *handler = adev->handler;
1939 struct acpi_device *child;
1940
1941 list_for_each_entry_reverse(child, &adev->children, node)
1942 acpi_bus_trim(child);
1943
1944 adev->flags.match_driver = false;
1945 if (handler) {
1946 if (handler->detach)
1947 handler->detach(adev);
1948
1949 adev->handler = NULL;
1950 } else {
1951 device_release_driver(&adev->dev);
1952 }
1953 /*
1954 * Most likely, the device is going away, so put it into D3cold before
1955 * that.
1956 */
1957 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1958 adev->flags.initialized = false;
1959 acpi_device_clear_enumerated(adev);
1960}
1961EXPORT_SYMBOL_GPL(acpi_bus_trim);
1962
1963static int acpi_bus_scan_fixed(void)
1964{
1965 int result = 0;
1966
1967 /*
1968 * Enumerate all fixed-feature devices.
1969 */
1970 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1971 struct acpi_device *device = NULL;
1972
1973 result = acpi_add_single_object(&device, NULL,
1974 ACPI_BUS_TYPE_POWER_BUTTON,
1975 ACPI_STA_DEFAULT);
1976 if (result)
1977 return result;
1978
1979 device->flags.match_driver = true;
1980 result = device_attach(&device->dev);
1981 if (result < 0)
1982 return result;
1983
1984 device_init_wakeup(&device->dev, true);
1985 }
1986
1987 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1988 struct acpi_device *device = NULL;
1989
1990 result = acpi_add_single_object(&device, NULL,
1991 ACPI_BUS_TYPE_SLEEP_BUTTON,
1992 ACPI_STA_DEFAULT);
1993 if (result)
1994 return result;
1995
1996 device->flags.match_driver = true;
1997 result = device_attach(&device->dev);
1998 }
1999
2000 return result < 0 ? result : 0;
2001}
2002
2003static void __init acpi_get_spcr_uart_addr(void)
2004{
2005 acpi_status status;
2006 struct acpi_table_spcr *spcr_ptr;
2007
2008 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2009 (struct acpi_table_header **)&spcr_ptr);
2010 if (ACPI_SUCCESS(status))
2011 spcr_uart_addr = spcr_ptr->serial_port.address;
2012 else
2013 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2014}
2015
2016static bool acpi_scan_initialized;
2017
2018int __init acpi_scan_init(void)
2019{
2020 int result;
2021 acpi_status status;
2022 struct acpi_table_stao *stao_ptr;
2023
2024 acpi_pci_root_init();
2025 acpi_pci_link_init();
2026 acpi_processor_init();
2027 acpi_lpss_init();
2028 acpi_apd_init();
2029 acpi_cmos_rtc_init();
2030 acpi_container_init();
2031 acpi_memory_hotplug_init();
2032 acpi_pnp_init();
2033 acpi_int340x_thermal_init();
2034 acpi_amba_init();
2035 acpi_watchdog_init();
2036
2037 acpi_scan_add_handler(&generic_device_handler);
2038
2039 /*
2040 * If there is STAO table, check whether it needs to ignore the UART
2041 * device in SPCR table.
2042 */
2043 status = acpi_get_table(ACPI_SIG_STAO, 0,
2044 (struct acpi_table_header **)&stao_ptr);
2045 if (ACPI_SUCCESS(status)) {
2046 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2047 printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2048
2049 if (stao_ptr->ignore_uart)
2050 acpi_get_spcr_uart_addr();
2051 }
2052
2053 mutex_lock(&acpi_scan_lock);
2054 /*
2055 * Enumerate devices in the ACPI namespace.
2056 */
2057 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2058 if (result)
2059 goto out;
2060
2061 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2062 if (result)
2063 goto out;
2064
2065 /* Fixed feature devices do not exist on HW-reduced platform */
2066 if (!acpi_gbl_reduced_hardware) {
2067 result = acpi_bus_scan_fixed();
2068 if (result) {
2069 acpi_detach_data(acpi_root->handle,
2070 acpi_scan_drop_device);
2071 acpi_device_del(acpi_root);
2072 put_device(&acpi_root->dev);
2073 goto out;
2074 }
2075 }
2076
2077 acpi_gpe_apply_masked_gpes();
2078 acpi_update_all_gpes();
2079 acpi_ec_ecdt_start();
2080
2081 acpi_scan_initialized = true;
2082
2083 out:
2084 mutex_unlock(&acpi_scan_lock);
2085 return result;
2086}
2087
2088static struct acpi_probe_entry *ape;
2089static int acpi_probe_count;
2090static DEFINE_MUTEX(acpi_probe_mutex);
2091
2092static int __init acpi_match_madt(struct acpi_subtable_header *header,
2093 const unsigned long end)
2094{
2095 if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2096 if (!ape->probe_subtbl(header, end))
2097 acpi_probe_count++;
2098
2099 return 0;
2100}
2101
2102int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2103{
2104 int count = 0;
2105
2106 if (acpi_disabled)
2107 return 0;
2108
2109 mutex_lock(&acpi_probe_mutex);
2110 for (ape = ap_head; nr; ape++, nr--) {
2111 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2112 acpi_probe_count = 0;
2113 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2114 count += acpi_probe_count;
2115 } else {
2116 int res;
2117 res = acpi_table_parse(ape->id, ape->probe_table);
2118 if (!res)
2119 count++;
2120 }
2121 }
2122 mutex_unlock(&acpi_probe_mutex);
2123
2124 return count;
2125}
2126
2127struct acpi_table_events_work {
2128 struct work_struct work;
2129 void *table;
2130 u32 event;
2131};
2132
2133static void acpi_table_events_fn(struct work_struct *work)
2134{
2135 struct acpi_table_events_work *tew;
2136
2137 tew = container_of(work, struct acpi_table_events_work, work);
2138
2139 if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2140 acpi_scan_lock_acquire();
2141 acpi_bus_scan(ACPI_ROOT_OBJECT);
2142 acpi_scan_lock_release();
2143 }
2144
2145 kfree(tew);
2146}
2147
2148void acpi_scan_table_handler(u32 event, void *table, void *context)
2149{
2150 struct acpi_table_events_work *tew;
2151
2152 if (!acpi_scan_initialized)
2153 return;
2154
2155 if (event != ACPI_TABLE_EVENT_LOAD)
2156 return;
2157
2158 tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2159 if (!tew)
2160 return;
2161
2162 INIT_WORK(&tew->work, acpi_table_events_fn);
2163 tew->table = table;
2164 tew->event = event;
2165
2166 schedule_work(&tew->work);
2167}
2168
2169int acpi_reconfig_notifier_register(struct notifier_block *nb)
2170{
2171 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2172}
2173EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2174
2175int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2176{
2177 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2178}
2179EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);