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1/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <linux/acpi.h>
10#include <linux/signal.h>
11#include <linux/kthread.h>
12#include <linux/dmi.h>
13
14#include <acpi/acpi_drivers.h>
15
16#include "internal.h"
17
18#define _COMPONENT ACPI_BUS_COMPONENT
19ACPI_MODULE_NAME("scan");
20#define STRUCT_TO_INT(s) (*((int*)&s))
21extern struct acpi_device *acpi_root;
22
23#define ACPI_BUS_CLASS "system_bus"
24#define ACPI_BUS_HID "LNXSYBUS"
25#define ACPI_BUS_DEVICE_NAME "System Bus"
26
27#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
28
29static const char *dummy_hid = "device";
30
31static LIST_HEAD(acpi_device_list);
32static LIST_HEAD(acpi_bus_id_list);
33DEFINE_MUTEX(acpi_device_lock);
34LIST_HEAD(acpi_wakeup_device_list);
35
36struct acpi_device_bus_id{
37 char bus_id[15];
38 unsigned int instance_no;
39 struct list_head node;
40};
41
42/*
43 * Creates hid/cid(s) string needed for modalias and uevent
44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45 * char *modalias: "acpi:IBM0001:ACPI0001"
46*/
47static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
48 int size)
49{
50 int len;
51 int count;
52 struct acpi_hardware_id *id;
53
54 if (list_empty(&acpi_dev->pnp.ids))
55 return 0;
56
57 len = snprintf(modalias, size, "acpi:");
58 size -= len;
59
60 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
61 count = snprintf(&modalias[len], size, "%s:", id->id);
62 if (count < 0 || count >= size)
63 return -EINVAL;
64 len += count;
65 size -= count;
66 }
67
68 modalias[len] = '\0';
69 return len;
70}
71
72static ssize_t
73acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
74 struct acpi_device *acpi_dev = to_acpi_device(dev);
75 int len;
76
77 /* Device has no HID and no CID or string is >1024 */
78 len = create_modalias(acpi_dev, buf, 1024);
79 if (len <= 0)
80 return 0;
81 buf[len++] = '\n';
82 return len;
83}
84static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
85
86static void acpi_bus_hot_remove_device(void *context)
87{
88 struct acpi_device *device;
89 acpi_handle handle = context;
90 struct acpi_object_list arg_list;
91 union acpi_object arg;
92 acpi_status status = AE_OK;
93
94 if (acpi_bus_get_device(handle, &device))
95 return;
96
97 if (!device)
98 return;
99
100 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
101 "Hot-removing device %s...\n", dev_name(&device->dev)));
102
103 if (acpi_bus_trim(device, 1)) {
104 printk(KERN_ERR PREFIX
105 "Removing device failed\n");
106 return;
107 }
108
109 /* power off device */
110 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
111 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
112 printk(KERN_WARNING PREFIX
113 "Power-off device failed\n");
114
115 if (device->flags.lockable) {
116 arg_list.count = 1;
117 arg_list.pointer = &arg;
118 arg.type = ACPI_TYPE_INTEGER;
119 arg.integer.value = 0;
120 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
121 }
122
123 arg_list.count = 1;
124 arg_list.pointer = &arg;
125 arg.type = ACPI_TYPE_INTEGER;
126 arg.integer.value = 1;
127
128 /*
129 * TBD: _EJD support.
130 */
131 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
132 if (ACPI_FAILURE(status))
133 printk(KERN_WARNING PREFIX
134 "Eject device failed\n");
135
136 return;
137}
138
139static ssize_t
140acpi_eject_store(struct device *d, struct device_attribute *attr,
141 const char *buf, size_t count)
142{
143 int ret = count;
144 acpi_status status;
145 acpi_object_type type = 0;
146 struct acpi_device *acpi_device = to_acpi_device(d);
147
148 if ((!count) || (buf[0] != '1')) {
149 return -EINVAL;
150 }
151#ifndef FORCE_EJECT
152 if (acpi_device->driver == NULL) {
153 ret = -ENODEV;
154 goto err;
155 }
156#endif
157 status = acpi_get_type(acpi_device->handle, &type);
158 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
159 ret = -ENODEV;
160 goto err;
161 }
162
163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
164err:
165 return ret;
166}
167
168static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
169
170static ssize_t
171acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
172 struct acpi_device *acpi_dev = to_acpi_device(dev);
173
174 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
175}
176static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
177
178static ssize_t
179acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
180 struct acpi_device *acpi_dev = to_acpi_device(dev);
181 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
182 int result;
183
184 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
185 if (result)
186 goto end;
187
188 result = sprintf(buf, "%s\n", (char*)path.pointer);
189 kfree(path.pointer);
190end:
191 return result;
192}
193static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
194
195static int acpi_device_setup_files(struct acpi_device *dev)
196{
197 acpi_status status;
198 acpi_handle temp;
199 int result = 0;
200
201 /*
202 * Devices gotten from FADT don't have a "path" attribute
203 */
204 if (dev->handle) {
205 result = device_create_file(&dev->dev, &dev_attr_path);
206 if (result)
207 goto end;
208 }
209
210 if (!list_empty(&dev->pnp.ids)) {
211 result = device_create_file(&dev->dev, &dev_attr_hid);
212 if (result)
213 goto end;
214
215 result = device_create_file(&dev->dev, &dev_attr_modalias);
216 if (result)
217 goto end;
218 }
219
220 /*
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
223 */
224 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225 if (ACPI_SUCCESS(status))
226 result = device_create_file(&dev->dev, &dev_attr_eject);
227end:
228 return result;
229}
230
231static void acpi_device_remove_files(struct acpi_device *dev)
232{
233 acpi_status status;
234 acpi_handle temp;
235
236 /*
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
239 */
240 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241 if (ACPI_SUCCESS(status))
242 device_remove_file(&dev->dev, &dev_attr_eject);
243
244 device_remove_file(&dev->dev, &dev_attr_modalias);
245 device_remove_file(&dev->dev, &dev_attr_hid);
246 if (dev->handle)
247 device_remove_file(&dev->dev, &dev_attr_path);
248}
249/* --------------------------------------------------------------------------
250 ACPI Bus operations
251 -------------------------------------------------------------------------- */
252
253int acpi_match_device_ids(struct acpi_device *device,
254 const struct acpi_device_id *ids)
255{
256 const struct acpi_device_id *id;
257 struct acpi_hardware_id *hwid;
258
259 /*
260 * If the device is not present, it is unnecessary to load device
261 * driver for it.
262 */
263 if (!device->status.present)
264 return -ENODEV;
265
266 for (id = ids; id->id[0]; id++)
267 list_for_each_entry(hwid, &device->pnp.ids, list)
268 if (!strcmp((char *) id->id, hwid->id))
269 return 0;
270
271 return -ENOENT;
272}
273EXPORT_SYMBOL(acpi_match_device_ids);
274
275static void acpi_free_ids(struct acpi_device *device)
276{
277 struct acpi_hardware_id *id, *tmp;
278
279 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
280 kfree(id->id);
281 kfree(id);
282 }
283}
284
285static void acpi_device_release(struct device *dev)
286{
287 struct acpi_device *acpi_dev = to_acpi_device(dev);
288
289 acpi_free_ids(acpi_dev);
290 kfree(acpi_dev);
291}
292
293static int acpi_device_suspend(struct device *dev, pm_message_t state)
294{
295 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 struct acpi_driver *acpi_drv = acpi_dev->driver;
297
298 if (acpi_drv && acpi_drv->ops.suspend)
299 return acpi_drv->ops.suspend(acpi_dev, state);
300 return 0;
301}
302
303static int acpi_device_resume(struct device *dev)
304{
305 struct acpi_device *acpi_dev = to_acpi_device(dev);
306 struct acpi_driver *acpi_drv = acpi_dev->driver;
307
308 if (acpi_drv && acpi_drv->ops.resume)
309 return acpi_drv->ops.resume(acpi_dev);
310 return 0;
311}
312
313static int acpi_bus_match(struct device *dev, struct device_driver *drv)
314{
315 struct acpi_device *acpi_dev = to_acpi_device(dev);
316 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
317
318 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
319}
320
321static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
322{
323 struct acpi_device *acpi_dev = to_acpi_device(dev);
324 int len;
325
326 if (list_empty(&acpi_dev->pnp.ids))
327 return 0;
328
329 if (add_uevent_var(env, "MODALIAS="))
330 return -ENOMEM;
331 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
332 sizeof(env->buf) - env->buflen);
333 if (len >= (sizeof(env->buf) - env->buflen))
334 return -ENOMEM;
335 env->buflen += len;
336 return 0;
337}
338
339static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
340{
341 struct acpi_device *device = data;
342
343 device->driver->ops.notify(device, event);
344}
345
346static acpi_status acpi_device_notify_fixed(void *data)
347{
348 struct acpi_device *device = data;
349
350 /* Fixed hardware devices have no handles */
351 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
352 return AE_OK;
353}
354
355static int acpi_device_install_notify_handler(struct acpi_device *device)
356{
357 acpi_status status;
358
359 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
360 status =
361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
362 acpi_device_notify_fixed,
363 device);
364 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
365 status =
366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367 acpi_device_notify_fixed,
368 device);
369 else
370 status = acpi_install_notify_handler(device->handle,
371 ACPI_DEVICE_NOTIFY,
372 acpi_device_notify,
373 device);
374
375 if (ACPI_FAILURE(status))
376 return -EINVAL;
377 return 0;
378}
379
380static void acpi_device_remove_notify_handler(struct acpi_device *device)
381{
382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
384 acpi_device_notify_fixed);
385 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed);
388 else
389 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
390 acpi_device_notify);
391}
392
393static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
394static int acpi_start_single_object(struct acpi_device *);
395static int acpi_device_probe(struct device * dev)
396{
397 struct acpi_device *acpi_dev = to_acpi_device(dev);
398 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
399 int ret;
400
401 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
402 if (!ret) {
403 if (acpi_dev->bus_ops.acpi_op_start)
404 acpi_start_single_object(acpi_dev);
405
406 if (acpi_drv->ops.notify) {
407 ret = acpi_device_install_notify_handler(acpi_dev);
408 if (ret) {
409 if (acpi_drv->ops.remove)
410 acpi_drv->ops.remove(acpi_dev,
411 acpi_dev->removal_type);
412 return ret;
413 }
414 }
415
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "Found driver [%s] for device [%s]\n",
418 acpi_drv->name, acpi_dev->pnp.bus_id));
419 get_device(dev);
420 }
421 return ret;
422}
423
424static int acpi_device_remove(struct device * dev)
425{
426 struct acpi_device *acpi_dev = to_acpi_device(dev);
427 struct acpi_driver *acpi_drv = acpi_dev->driver;
428
429 if (acpi_drv) {
430 if (acpi_drv->ops.notify)
431 acpi_device_remove_notify_handler(acpi_dev);
432 if (acpi_drv->ops.remove)
433 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
434 }
435 acpi_dev->driver = NULL;
436 acpi_dev->driver_data = NULL;
437
438 put_device(dev);
439 return 0;
440}
441
442struct bus_type acpi_bus_type = {
443 .name = "acpi",
444 .suspend = acpi_device_suspend,
445 .resume = acpi_device_resume,
446 .match = acpi_bus_match,
447 .probe = acpi_device_probe,
448 .remove = acpi_device_remove,
449 .uevent = acpi_device_uevent,
450};
451
452static int acpi_device_register(struct acpi_device *device)
453{
454 int result;
455 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
456 int found = 0;
457
458 /*
459 * Linkage
460 * -------
461 * Link this device to its parent and siblings.
462 */
463 INIT_LIST_HEAD(&device->children);
464 INIT_LIST_HEAD(&device->node);
465 INIT_LIST_HEAD(&device->wakeup_list);
466
467 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
468 if (!new_bus_id) {
469 printk(KERN_ERR PREFIX "Memory allocation error\n");
470 return -ENOMEM;
471 }
472
473 mutex_lock(&acpi_device_lock);
474 /*
475 * Find suitable bus_id and instance number in acpi_bus_id_list
476 * If failed, create one and link it into acpi_bus_id_list
477 */
478 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
479 if (!strcmp(acpi_device_bus_id->bus_id,
480 acpi_device_hid(device))) {
481 acpi_device_bus_id->instance_no++;
482 found = 1;
483 kfree(new_bus_id);
484 break;
485 }
486 }
487 if (!found) {
488 acpi_device_bus_id = new_bus_id;
489 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
490 acpi_device_bus_id->instance_no = 0;
491 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
492 }
493 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
494
495 if (device->parent)
496 list_add_tail(&device->node, &device->parent->children);
497
498 if (device->wakeup.flags.valid)
499 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
500 mutex_unlock(&acpi_device_lock);
501
502 if (device->parent)
503 device->dev.parent = &device->parent->dev;
504 device->dev.bus = &acpi_bus_type;
505 device->dev.release = &acpi_device_release;
506 result = device_register(&device->dev);
507 if (result) {
508 dev_err(&device->dev, "Error registering device\n");
509 goto end;
510 }
511
512 result = acpi_device_setup_files(device);
513 if (result)
514 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
515 dev_name(&device->dev));
516
517 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
518 return 0;
519end:
520 mutex_lock(&acpi_device_lock);
521 if (device->parent)
522 list_del(&device->node);
523 list_del(&device->wakeup_list);
524 mutex_unlock(&acpi_device_lock);
525 return result;
526}
527
528static void acpi_device_unregister(struct acpi_device *device, int type)
529{
530 mutex_lock(&acpi_device_lock);
531 if (device->parent)
532 list_del(&device->node);
533
534 list_del(&device->wakeup_list);
535 mutex_unlock(&acpi_device_lock);
536
537 acpi_detach_data(device->handle, acpi_bus_data_handler);
538
539 acpi_device_remove_files(device);
540 device_unregister(&device->dev);
541}
542
543/* --------------------------------------------------------------------------
544 Driver Management
545 -------------------------------------------------------------------------- */
546/**
547 * acpi_bus_driver_init - add a device to a driver
548 * @device: the device to add and initialize
549 * @driver: driver for the device
550 *
551 * Used to initialize a device via its device driver. Called whenever a
552 * driver is bound to a device. Invokes the driver's add() ops.
553 */
554static int
555acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
556{
557 int result = 0;
558
559 if (!device || !driver)
560 return -EINVAL;
561
562 if (!driver->ops.add)
563 return -ENOSYS;
564
565 result = driver->ops.add(device);
566 if (result) {
567 device->driver = NULL;
568 device->driver_data = NULL;
569 return result;
570 }
571
572 device->driver = driver;
573
574 /*
575 * TBD - Configuration Management: Assign resources to device based
576 * upon possible configuration and currently allocated resources.
577 */
578
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580 "Driver successfully bound to device\n"));
581 return 0;
582}
583
584static int acpi_start_single_object(struct acpi_device *device)
585{
586 int result = 0;
587 struct acpi_driver *driver;
588
589
590 if (!(driver = device->driver))
591 return 0;
592
593 if (driver->ops.start) {
594 result = driver->ops.start(device);
595 if (result && driver->ops.remove)
596 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
597 }
598
599 return result;
600}
601
602/**
603 * acpi_bus_register_driver - register a driver with the ACPI bus
604 * @driver: driver being registered
605 *
606 * Registers a driver with the ACPI bus. Searches the namespace for all
607 * devices that match the driver's criteria and binds. Returns zero for
608 * success or a negative error status for failure.
609 */
610int acpi_bus_register_driver(struct acpi_driver *driver)
611{
612 int ret;
613
614 if (acpi_disabled)
615 return -ENODEV;
616 driver->drv.name = driver->name;
617 driver->drv.bus = &acpi_bus_type;
618 driver->drv.owner = driver->owner;
619
620 ret = driver_register(&driver->drv);
621 return ret;
622}
623
624EXPORT_SYMBOL(acpi_bus_register_driver);
625
626/**
627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628 * @driver: driver to unregister
629 *
630 * Unregisters a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and unbinds.
632 */
633void acpi_bus_unregister_driver(struct acpi_driver *driver)
634{
635 driver_unregister(&driver->drv);
636}
637
638EXPORT_SYMBOL(acpi_bus_unregister_driver);
639
640/* --------------------------------------------------------------------------
641 Device Enumeration
642 -------------------------------------------------------------------------- */
643static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
644{
645 acpi_status status;
646 int ret;
647 struct acpi_device *device;
648
649 /*
650 * Fixed hardware devices do not appear in the namespace and do not
651 * have handles, but we fabricate acpi_devices for them, so we have
652 * to deal with them specially.
653 */
654 if (handle == NULL)
655 return acpi_root;
656
657 do {
658 status = acpi_get_parent(handle, &handle);
659 if (status == AE_NULL_ENTRY)
660 return NULL;
661 if (ACPI_FAILURE(status))
662 return acpi_root;
663
664 ret = acpi_bus_get_device(handle, &device);
665 if (ret == 0)
666 return device;
667 } while (1);
668}
669
670acpi_status
671acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
672{
673 acpi_status status;
674 acpi_handle tmp;
675 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
676 union acpi_object *obj;
677
678 status = acpi_get_handle(handle, "_EJD", &tmp);
679 if (ACPI_FAILURE(status))
680 return status;
681
682 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
683 if (ACPI_SUCCESS(status)) {
684 obj = buffer.pointer;
685 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
686 ejd);
687 kfree(buffer.pointer);
688 }
689 return status;
690}
691EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
692
693void acpi_bus_data_handler(acpi_handle handle, void *context)
694{
695
696 /* TBD */
697
698 return;
699}
700
701static int acpi_bus_get_perf_flags(struct acpi_device *device)
702{
703 device->performance.state = ACPI_STATE_UNKNOWN;
704 return 0;
705}
706
707static acpi_status
708acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
709 struct acpi_device_wakeup *wakeup)
710{
711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
713 union acpi_object *element = NULL;
714 acpi_status status;
715 int i = 0;
716
717 if (!wakeup)
718 return AE_BAD_PARAMETER;
719
720 /* _PRW */
721 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
722 if (ACPI_FAILURE(status)) {
723 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
724 return status;
725 }
726
727 package = (union acpi_object *)buffer.pointer;
728
729 if (!package || (package->package.count < 2)) {
730 status = AE_BAD_DATA;
731 goto out;
732 }
733
734 element = &(package->package.elements[0]);
735 if (!element) {
736 status = AE_BAD_DATA;
737 goto out;
738 }
739 if (element->type == ACPI_TYPE_PACKAGE) {
740 if ((element->package.count < 2) ||
741 (element->package.elements[0].type !=
742 ACPI_TYPE_LOCAL_REFERENCE)
743 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
744 status = AE_BAD_DATA;
745 goto out;
746 }
747 wakeup->gpe_device =
748 element->package.elements[0].reference.handle;
749 wakeup->gpe_number =
750 (u32) element->package.elements[1].integer.value;
751 } else if (element->type == ACPI_TYPE_INTEGER) {
752 wakeup->gpe_device = NULL;
753 wakeup->gpe_number = element->integer.value;
754 } else {
755 status = AE_BAD_DATA;
756 goto out;
757 }
758
759 element = &(package->package.elements[1]);
760 if (element->type != ACPI_TYPE_INTEGER) {
761 status = AE_BAD_DATA;
762 goto out;
763 }
764 wakeup->sleep_state = element->integer.value;
765
766 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
767 status = AE_NO_MEMORY;
768 goto out;
769 }
770 wakeup->resources.count = package->package.count - 2;
771 for (i = 0; i < wakeup->resources.count; i++) {
772 element = &(package->package.elements[i + 2]);
773 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
774 status = AE_BAD_DATA;
775 goto out;
776 }
777
778 wakeup->resources.handles[i] = element->reference.handle;
779 }
780
781 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
782
783 out:
784 kfree(buffer.pointer);
785
786 return status;
787}
788
789static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
790{
791 struct acpi_device_id button_device_ids[] = {
792 {"PNP0C0D", 0},
793 {"PNP0C0C", 0},
794 {"PNP0C0E", 0},
795 {"", 0},
796 };
797 acpi_status status;
798 acpi_event_status event_status;
799
800 device->wakeup.flags.notifier_present = 0;
801
802 /* Power button, Lid switch always enable wakeup */
803 if (!acpi_match_device_ids(device, button_device_ids)) {
804 device->wakeup.flags.run_wake = 1;
805 device_set_wakeup_capable(&device->dev, true);
806 return;
807 }
808
809 status = acpi_get_gpe_status(device->wakeup.gpe_device,
810 device->wakeup.gpe_number,
811 &event_status);
812 if (status == AE_OK)
813 device->wakeup.flags.run_wake =
814 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
815}
816
817static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
818{
819 acpi_handle temp;
820 acpi_status status = 0;
821 int psw_error;
822
823 /* Presence of _PRW indicates wake capable */
824 status = acpi_get_handle(device->handle, "_PRW", &temp);
825 if (ACPI_FAILURE(status))
826 return;
827
828 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
829 &device->wakeup);
830 if (ACPI_FAILURE(status)) {
831 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
832 return;
833 }
834
835 device->wakeup.flags.valid = 1;
836 device->wakeup.prepare_count = 0;
837 acpi_bus_set_run_wake_flags(device);
838 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
839 * system for the ACPI device with the _PRW object.
840 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
841 * So it is necessary to call _DSW object first. Only when it is not
842 * present will the _PSW object used.
843 */
844 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
845 if (psw_error)
846 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847 "error in _DSW or _PSW evaluation\n"));
848}
849
850static void acpi_bus_add_power_resource(acpi_handle handle);
851
852static int acpi_bus_get_power_flags(struct acpi_device *device)
853{
854 acpi_status status = 0;
855 acpi_handle handle = NULL;
856 u32 i = 0;
857
858
859 /*
860 * Power Management Flags
861 */
862 status = acpi_get_handle(device->handle, "_PSC", &handle);
863 if (ACPI_SUCCESS(status))
864 device->power.flags.explicit_get = 1;
865 status = acpi_get_handle(device->handle, "_IRC", &handle);
866 if (ACPI_SUCCESS(status))
867 device->power.flags.inrush_current = 1;
868
869 /*
870 * Enumerate supported power management states
871 */
872 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
873 struct acpi_device_power_state *ps = &device->power.states[i];
874 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
875
876 /* Evaluate "_PRx" to se if power resources are referenced */
877 acpi_evaluate_reference(device->handle, object_name, NULL,
878 &ps->resources);
879 if (ps->resources.count) {
880 int j;
881
882 device->power.flags.power_resources = 1;
883 ps->flags.valid = 1;
884 for (j = 0; j < ps->resources.count; j++)
885 acpi_bus_add_power_resource(ps->resources.handles[j]);
886 }
887
888 /* Evaluate "_PSx" to see if we can do explicit sets */
889 object_name[2] = 'S';
890 status = acpi_get_handle(device->handle, object_name, &handle);
891 if (ACPI_SUCCESS(status)) {
892 ps->flags.explicit_set = 1;
893 ps->flags.valid = 1;
894 }
895
896 /* State is valid if we have some power control */
897 if (ps->resources.count || ps->flags.explicit_set)
898 ps->flags.valid = 1;
899
900 ps->power = -1; /* Unknown - driver assigned */
901 ps->latency = -1; /* Unknown - driver assigned */
902 }
903
904 /* Set defaults for D0 and D3 states (always valid) */
905 device->power.states[ACPI_STATE_D0].flags.valid = 1;
906 device->power.states[ACPI_STATE_D0].power = 100;
907 device->power.states[ACPI_STATE_D3].flags.valid = 1;
908 device->power.states[ACPI_STATE_D3].power = 0;
909
910 acpi_bus_init_power(device);
911
912 return 0;
913}
914
915static int acpi_bus_get_flags(struct acpi_device *device)
916{
917 acpi_status status = AE_OK;
918 acpi_handle temp = NULL;
919
920
921 /* Presence of _STA indicates 'dynamic_status' */
922 status = acpi_get_handle(device->handle, "_STA", &temp);
923 if (ACPI_SUCCESS(status))
924 device->flags.dynamic_status = 1;
925
926 /* Presence of _RMV indicates 'removable' */
927 status = acpi_get_handle(device->handle, "_RMV", &temp);
928 if (ACPI_SUCCESS(status))
929 device->flags.removable = 1;
930
931 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
932 status = acpi_get_handle(device->handle, "_EJD", &temp);
933 if (ACPI_SUCCESS(status))
934 device->flags.ejectable = 1;
935 else {
936 status = acpi_get_handle(device->handle, "_EJ0", &temp);
937 if (ACPI_SUCCESS(status))
938 device->flags.ejectable = 1;
939 }
940
941 /* Presence of _LCK indicates 'lockable' */
942 status = acpi_get_handle(device->handle, "_LCK", &temp);
943 if (ACPI_SUCCESS(status))
944 device->flags.lockable = 1;
945
946 /* Power resources cannot be power manageable. */
947 if (device->device_type == ACPI_BUS_TYPE_POWER)
948 return 0;
949
950 /* Presence of _PS0|_PR0 indicates 'power manageable' */
951 status = acpi_get_handle(device->handle, "_PS0", &temp);
952 if (ACPI_FAILURE(status))
953 status = acpi_get_handle(device->handle, "_PR0", &temp);
954 if (ACPI_SUCCESS(status))
955 device->flags.power_manageable = 1;
956
957 /* TBD: Performance management */
958
959 return 0;
960}
961
962static void acpi_device_get_busid(struct acpi_device *device)
963{
964 char bus_id[5] = { '?', 0 };
965 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
966 int i = 0;
967
968 /*
969 * Bus ID
970 * ------
971 * The device's Bus ID is simply the object name.
972 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
973 */
974 if (ACPI_IS_ROOT_DEVICE(device)) {
975 strcpy(device->pnp.bus_id, "ACPI");
976 return;
977 }
978
979 switch (device->device_type) {
980 case ACPI_BUS_TYPE_POWER_BUTTON:
981 strcpy(device->pnp.bus_id, "PWRF");
982 break;
983 case ACPI_BUS_TYPE_SLEEP_BUTTON:
984 strcpy(device->pnp.bus_id, "SLPF");
985 break;
986 default:
987 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
988 /* Clean up trailing underscores (if any) */
989 for (i = 3; i > 1; i--) {
990 if (bus_id[i] == '_')
991 bus_id[i] = '\0';
992 else
993 break;
994 }
995 strcpy(device->pnp.bus_id, bus_id);
996 break;
997 }
998}
999
1000/*
1001 * acpi_bay_match - see if a device is an ejectable driver bay
1002 *
1003 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1004 * then we can safely call it an ejectable drive bay
1005 */
1006static int acpi_bay_match(struct acpi_device *device){
1007 acpi_status status;
1008 acpi_handle handle;
1009 acpi_handle tmp;
1010 acpi_handle phandle;
1011
1012 handle = device->handle;
1013
1014 status = acpi_get_handle(handle, "_EJ0", &tmp);
1015 if (ACPI_FAILURE(status))
1016 return -ENODEV;
1017
1018 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1019 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1020 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1021 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1022 return 0;
1023
1024 if (acpi_get_parent(handle, &phandle))
1025 return -ENODEV;
1026
1027 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1028 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1029 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1030 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1031 return 0;
1032
1033 return -ENODEV;
1034}
1035
1036/*
1037 * acpi_dock_match - see if a device has a _DCK method
1038 */
1039static int acpi_dock_match(struct acpi_device *device)
1040{
1041 acpi_handle tmp;
1042 return acpi_get_handle(device->handle, "_DCK", &tmp);
1043}
1044
1045const char *acpi_device_hid(struct acpi_device *device)
1046{
1047 struct acpi_hardware_id *hid;
1048
1049 if (list_empty(&device->pnp.ids))
1050 return dummy_hid;
1051
1052 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1053 return hid->id;
1054}
1055EXPORT_SYMBOL(acpi_device_hid);
1056
1057static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1058{
1059 struct acpi_hardware_id *id;
1060
1061 id = kmalloc(sizeof(*id), GFP_KERNEL);
1062 if (!id)
1063 return;
1064
1065 id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1066 if (!id->id) {
1067 kfree(id);
1068 return;
1069 }
1070
1071 strcpy(id->id, dev_id);
1072 list_add_tail(&id->list, &device->pnp.ids);
1073}
1074
1075/*
1076 * Old IBM workstations have a DSDT bug wherein the SMBus object
1077 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1078 * prefix. Work around this.
1079 */
1080static int acpi_ibm_smbus_match(struct acpi_device *device)
1081{
1082 acpi_handle h_dummy;
1083 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1084 int result;
1085
1086 if (!dmi_name_in_vendors("IBM"))
1087 return -ENODEV;
1088
1089 /* Look for SMBS object */
1090 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1091 if (result)
1092 return result;
1093
1094 if (strcmp("SMBS", path.pointer)) {
1095 result = -ENODEV;
1096 goto out;
1097 }
1098
1099 /* Does it have the necessary (but misnamed) methods? */
1100 result = -ENODEV;
1101 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1102 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1103 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1104 result = 0;
1105out:
1106 kfree(path.pointer);
1107 return result;
1108}
1109
1110static void acpi_device_set_id(struct acpi_device *device)
1111{
1112 acpi_status status;
1113 struct acpi_device_info *info;
1114 struct acpica_device_id_list *cid_list;
1115 int i;
1116
1117 switch (device->device_type) {
1118 case ACPI_BUS_TYPE_DEVICE:
1119 if (ACPI_IS_ROOT_DEVICE(device)) {
1120 acpi_add_id(device, ACPI_SYSTEM_HID);
1121 break;
1122 }
1123
1124 status = acpi_get_object_info(device->handle, &info);
1125 if (ACPI_FAILURE(status)) {
1126 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1127 return;
1128 }
1129
1130 if (info->valid & ACPI_VALID_HID)
1131 acpi_add_id(device, info->hardware_id.string);
1132 if (info->valid & ACPI_VALID_CID) {
1133 cid_list = &info->compatible_id_list;
1134 for (i = 0; i < cid_list->count; i++)
1135 acpi_add_id(device, cid_list->ids[i].string);
1136 }
1137 if (info->valid & ACPI_VALID_ADR) {
1138 device->pnp.bus_address = info->address;
1139 device->flags.bus_address = 1;
1140 }
1141
1142 kfree(info);
1143
1144 /*
1145 * Some devices don't reliably have _HIDs & _CIDs, so add
1146 * synthetic HIDs to make sure drivers can find them.
1147 */
1148 if (acpi_is_video_device(device))
1149 acpi_add_id(device, ACPI_VIDEO_HID);
1150 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1151 acpi_add_id(device, ACPI_BAY_HID);
1152 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1153 acpi_add_id(device, ACPI_DOCK_HID);
1154 else if (!acpi_ibm_smbus_match(device))
1155 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1156 else if (!acpi_device_hid(device) &&
1157 ACPI_IS_ROOT_DEVICE(device->parent)) {
1158 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1159 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1160 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1161 }
1162
1163 break;
1164 case ACPI_BUS_TYPE_POWER:
1165 acpi_add_id(device, ACPI_POWER_HID);
1166 break;
1167 case ACPI_BUS_TYPE_PROCESSOR:
1168 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1169 break;
1170 case ACPI_BUS_TYPE_THERMAL:
1171 acpi_add_id(device, ACPI_THERMAL_HID);
1172 break;
1173 case ACPI_BUS_TYPE_POWER_BUTTON:
1174 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1175 break;
1176 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1177 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1178 break;
1179 }
1180}
1181
1182static int acpi_device_set_context(struct acpi_device *device)
1183{
1184 acpi_status status;
1185
1186 /*
1187 * Context
1188 * -------
1189 * Attach this 'struct acpi_device' to the ACPI object. This makes
1190 * resolutions from handle->device very efficient. Fixed hardware
1191 * devices have no handles, so we skip them.
1192 */
1193 if (!device->handle)
1194 return 0;
1195
1196 status = acpi_attach_data(device->handle,
1197 acpi_bus_data_handler, device);
1198 if (ACPI_SUCCESS(status))
1199 return 0;
1200
1201 printk(KERN_ERR PREFIX "Error attaching device data\n");
1202 return -ENODEV;
1203}
1204
1205static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1206{
1207 if (!dev)
1208 return -EINVAL;
1209
1210 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1211 device_release_driver(&dev->dev);
1212
1213 if (!rmdevice)
1214 return 0;
1215
1216 /*
1217 * unbind _ADR-Based Devices when hot removal
1218 */
1219 if (dev->flags.bus_address) {
1220 if ((dev->parent) && (dev->parent->ops.unbind))
1221 dev->parent->ops.unbind(dev);
1222 }
1223 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1224
1225 return 0;
1226}
1227
1228static int acpi_add_single_object(struct acpi_device **child,
1229 acpi_handle handle, int type,
1230 unsigned long long sta,
1231 struct acpi_bus_ops *ops)
1232{
1233 int result;
1234 struct acpi_device *device;
1235 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1236
1237 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1238 if (!device) {
1239 printk(KERN_ERR PREFIX "Memory allocation error\n");
1240 return -ENOMEM;
1241 }
1242
1243 INIT_LIST_HEAD(&device->pnp.ids);
1244 device->device_type = type;
1245 device->handle = handle;
1246 device->parent = acpi_bus_get_parent(handle);
1247 device->bus_ops = *ops; /* workround for not call .start */
1248 STRUCT_TO_INT(device->status) = sta;
1249
1250 acpi_device_get_busid(device);
1251
1252 /*
1253 * Flags
1254 * -----
1255 * Note that we only look for object handles -- cannot evaluate objects
1256 * until we know the device is present and properly initialized.
1257 */
1258 result = acpi_bus_get_flags(device);
1259 if (result)
1260 goto end;
1261
1262 /*
1263 * Initialize Device
1264 * -----------------
1265 * TBD: Synch with Core's enumeration/initialization process.
1266 */
1267 acpi_device_set_id(device);
1268
1269 /*
1270 * Power Management
1271 * ----------------
1272 */
1273 if (device->flags.power_manageable) {
1274 result = acpi_bus_get_power_flags(device);
1275 if (result)
1276 goto end;
1277 }
1278
1279 /*
1280 * Wakeup device management
1281 *-----------------------
1282 */
1283 acpi_bus_get_wakeup_device_flags(device);
1284
1285 /*
1286 * Performance Management
1287 * ----------------------
1288 */
1289 if (device->flags.performance_manageable) {
1290 result = acpi_bus_get_perf_flags(device);
1291 if (result)
1292 goto end;
1293 }
1294
1295 if ((result = acpi_device_set_context(device)))
1296 goto end;
1297
1298 result = acpi_device_register(device);
1299
1300 /*
1301 * Bind _ADR-Based Devices when hot add
1302 */
1303 if (device->flags.bus_address) {
1304 if (device->parent && device->parent->ops.bind)
1305 device->parent->ops.bind(device);
1306 }
1307
1308end:
1309 if (!result) {
1310 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1311 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1312 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1313 (char *) buffer.pointer,
1314 device->parent ? dev_name(&device->parent->dev) :
1315 "(null)"));
1316 kfree(buffer.pointer);
1317 *child = device;
1318 } else
1319 acpi_device_release(&device->dev);
1320
1321 return result;
1322}
1323
1324#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1325 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1326
1327static void acpi_bus_add_power_resource(acpi_handle handle)
1328{
1329 struct acpi_bus_ops ops = {
1330 .acpi_op_add = 1,
1331 .acpi_op_start = 1,
1332 };
1333 struct acpi_device *device = NULL;
1334
1335 acpi_bus_get_device(handle, &device);
1336 if (!device)
1337 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1338 ACPI_STA_DEFAULT, &ops);
1339}
1340
1341static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1342 unsigned long long *sta)
1343{
1344 acpi_status status;
1345 acpi_object_type acpi_type;
1346
1347 status = acpi_get_type(handle, &acpi_type);
1348 if (ACPI_FAILURE(status))
1349 return -ENODEV;
1350
1351 switch (acpi_type) {
1352 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1353 case ACPI_TYPE_DEVICE:
1354 *type = ACPI_BUS_TYPE_DEVICE;
1355 status = acpi_bus_get_status_handle(handle, sta);
1356 if (ACPI_FAILURE(status))
1357 return -ENODEV;
1358 break;
1359 case ACPI_TYPE_PROCESSOR:
1360 *type = ACPI_BUS_TYPE_PROCESSOR;
1361 status = acpi_bus_get_status_handle(handle, sta);
1362 if (ACPI_FAILURE(status))
1363 return -ENODEV;
1364 break;
1365 case ACPI_TYPE_THERMAL:
1366 *type = ACPI_BUS_TYPE_THERMAL;
1367 *sta = ACPI_STA_DEFAULT;
1368 break;
1369 case ACPI_TYPE_POWER:
1370 *type = ACPI_BUS_TYPE_POWER;
1371 *sta = ACPI_STA_DEFAULT;
1372 break;
1373 default:
1374 return -ENODEV;
1375 }
1376
1377 return 0;
1378}
1379
1380static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1381 void *context, void **return_value)
1382{
1383 struct acpi_bus_ops *ops = context;
1384 int type;
1385 unsigned long long sta;
1386 struct acpi_device *device;
1387 acpi_status status;
1388 int result;
1389
1390 result = acpi_bus_type_and_status(handle, &type, &sta);
1391 if (result)
1392 return AE_OK;
1393
1394 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1395 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1396 struct acpi_device_wakeup wakeup;
1397 acpi_handle temp;
1398
1399 status = acpi_get_handle(handle, "_PRW", &temp);
1400 if (ACPI_SUCCESS(status))
1401 acpi_bus_extract_wakeup_device_power_package(handle,
1402 &wakeup);
1403 return AE_CTRL_DEPTH;
1404 }
1405
1406 /*
1407 * We may already have an acpi_device from a previous enumeration. If
1408 * so, we needn't add it again, but we may still have to start it.
1409 */
1410 device = NULL;
1411 acpi_bus_get_device(handle, &device);
1412 if (ops->acpi_op_add && !device)
1413 acpi_add_single_object(&device, handle, type, sta, ops);
1414
1415 if (!device)
1416 return AE_CTRL_DEPTH;
1417
1418 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1419 status = acpi_start_single_object(device);
1420 if (ACPI_FAILURE(status))
1421 return AE_CTRL_DEPTH;
1422 }
1423
1424 if (!*return_value)
1425 *return_value = device;
1426 return AE_OK;
1427}
1428
1429static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1430 struct acpi_device **child)
1431{
1432 acpi_status status;
1433 void *device = NULL;
1434
1435 status = acpi_bus_check_add(handle, 0, ops, &device);
1436 if (ACPI_SUCCESS(status))
1437 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1438 acpi_bus_check_add, NULL, ops, &device);
1439
1440 if (child)
1441 *child = device;
1442
1443 if (device)
1444 return 0;
1445 else
1446 return -ENODEV;
1447}
1448
1449/*
1450 * acpi_bus_add and acpi_bus_start
1451 *
1452 * scan a given ACPI tree and (probably recently hot-plugged)
1453 * create and add or starts found devices.
1454 *
1455 * If no devices were found -ENODEV is returned which does not
1456 * mean that this is a real error, there just have been no suitable
1457 * ACPI objects in the table trunk from which the kernel could create
1458 * a device and add/start an appropriate driver.
1459 */
1460
1461int
1462acpi_bus_add(struct acpi_device **child,
1463 struct acpi_device *parent, acpi_handle handle, int type)
1464{
1465 struct acpi_bus_ops ops;
1466
1467 memset(&ops, 0, sizeof(ops));
1468 ops.acpi_op_add = 1;
1469
1470 return acpi_bus_scan(handle, &ops, child);
1471}
1472EXPORT_SYMBOL(acpi_bus_add);
1473
1474int acpi_bus_start(struct acpi_device *device)
1475{
1476 struct acpi_bus_ops ops;
1477 int result;
1478
1479 if (!device)
1480 return -EINVAL;
1481
1482 memset(&ops, 0, sizeof(ops));
1483 ops.acpi_op_start = 1;
1484
1485 result = acpi_bus_scan(device->handle, &ops, NULL);
1486
1487 acpi_update_all_gpes();
1488
1489 return result;
1490}
1491EXPORT_SYMBOL(acpi_bus_start);
1492
1493int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1494{
1495 acpi_status status;
1496 struct acpi_device *parent, *child;
1497 acpi_handle phandle, chandle;
1498 acpi_object_type type;
1499 u32 level = 1;
1500 int err = 0;
1501
1502 parent = start;
1503 phandle = start->handle;
1504 child = chandle = NULL;
1505
1506 while ((level > 0) && parent && (!err)) {
1507 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1508 chandle, &chandle);
1509
1510 /*
1511 * If this scope is exhausted then move our way back up.
1512 */
1513 if (ACPI_FAILURE(status)) {
1514 level--;
1515 chandle = phandle;
1516 acpi_get_parent(phandle, &phandle);
1517 child = parent;
1518 parent = parent->parent;
1519
1520 if (level == 0)
1521 err = acpi_bus_remove(child, rmdevice);
1522 else
1523 err = acpi_bus_remove(child, 1);
1524
1525 continue;
1526 }
1527
1528 status = acpi_get_type(chandle, &type);
1529 if (ACPI_FAILURE(status)) {
1530 continue;
1531 }
1532 /*
1533 * If there is a device corresponding to chandle then
1534 * parse it (depth-first).
1535 */
1536 if (acpi_bus_get_device(chandle, &child) == 0) {
1537 level++;
1538 phandle = chandle;
1539 chandle = NULL;
1540 parent = child;
1541 }
1542 continue;
1543 }
1544 return err;
1545}
1546EXPORT_SYMBOL_GPL(acpi_bus_trim);
1547
1548static int acpi_bus_scan_fixed(void)
1549{
1550 int result = 0;
1551 struct acpi_device *device = NULL;
1552 struct acpi_bus_ops ops;
1553
1554 memset(&ops, 0, sizeof(ops));
1555 ops.acpi_op_add = 1;
1556 ops.acpi_op_start = 1;
1557
1558 /*
1559 * Enumerate all fixed-feature devices.
1560 */
1561 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1562 result = acpi_add_single_object(&device, NULL,
1563 ACPI_BUS_TYPE_POWER_BUTTON,
1564 ACPI_STA_DEFAULT,
1565 &ops);
1566 }
1567
1568 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1569 result = acpi_add_single_object(&device, NULL,
1570 ACPI_BUS_TYPE_SLEEP_BUTTON,
1571 ACPI_STA_DEFAULT,
1572 &ops);
1573 }
1574
1575 return result;
1576}
1577
1578int __init acpi_scan_init(void)
1579{
1580 int result;
1581 struct acpi_bus_ops ops;
1582
1583 memset(&ops, 0, sizeof(ops));
1584 ops.acpi_op_add = 1;
1585 ops.acpi_op_start = 1;
1586
1587 result = bus_register(&acpi_bus_type);
1588 if (result) {
1589 /* We don't want to quit even if we failed to add suspend/resume */
1590 printk(KERN_ERR PREFIX "Could not register bus type\n");
1591 }
1592
1593 acpi_power_init();
1594
1595 /*
1596 * Enumerate devices in the ACPI namespace.
1597 */
1598 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1599
1600 if (!result)
1601 result = acpi_bus_scan_fixed();
1602
1603 if (result)
1604 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1605 else
1606 acpi_update_all_gpes();
1607
1608 return result;
1609}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * scan.c - support for transforming the ACPI namespace into individual objects
4 */
5
6#include <linux/module.h>
7#include <linux/init.h>
8#include <linux/slab.h>
9#include <linux/kernel.h>
10#include <linux/acpi.h>
11#include <linux/acpi_iort.h>
12#include <linux/signal.h>
13#include <linux/kthread.h>
14#include <linux/dmi.h>
15#include <linux/nls.h>
16#include <linux/dma-mapping.h>
17#include <linux/platform_data/x86/apple.h>
18
19#include <asm/pgtable.h>
20
21#include "internal.h"
22
23#define _COMPONENT ACPI_BUS_COMPONENT
24ACPI_MODULE_NAME("scan");
25extern struct acpi_device *acpi_root;
26
27#define ACPI_BUS_CLASS "system_bus"
28#define ACPI_BUS_HID "LNXSYBUS"
29#define ACPI_BUS_DEVICE_NAME "System Bus"
30
31#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
32
33#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
34
35static const char *dummy_hid = "device";
36
37static LIST_HEAD(acpi_dep_list);
38static DEFINE_MUTEX(acpi_dep_list_lock);
39LIST_HEAD(acpi_bus_id_list);
40static DEFINE_MUTEX(acpi_scan_lock);
41static LIST_HEAD(acpi_scan_handlers_list);
42DEFINE_MUTEX(acpi_device_lock);
43LIST_HEAD(acpi_wakeup_device_list);
44static DEFINE_MUTEX(acpi_hp_context_lock);
45
46/*
47 * The UART device described by the SPCR table is the only object which needs
48 * special-casing. Everything else is covered by ACPI namespace paths in STAO
49 * table.
50 */
51static u64 spcr_uart_addr;
52
53struct acpi_dep_data {
54 struct list_head node;
55 acpi_handle master;
56 acpi_handle slave;
57};
58
59void acpi_scan_lock_acquire(void)
60{
61 mutex_lock(&acpi_scan_lock);
62}
63EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
64
65void acpi_scan_lock_release(void)
66{
67 mutex_unlock(&acpi_scan_lock);
68}
69EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
70
71void acpi_lock_hp_context(void)
72{
73 mutex_lock(&acpi_hp_context_lock);
74}
75
76void acpi_unlock_hp_context(void)
77{
78 mutex_unlock(&acpi_hp_context_lock);
79}
80
81void acpi_initialize_hp_context(struct acpi_device *adev,
82 struct acpi_hotplug_context *hp,
83 int (*notify)(struct acpi_device *, u32),
84 void (*uevent)(struct acpi_device *, u32))
85{
86 acpi_lock_hp_context();
87 hp->notify = notify;
88 hp->uevent = uevent;
89 acpi_set_hp_context(adev, hp);
90 acpi_unlock_hp_context();
91}
92EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
93
94int acpi_scan_add_handler(struct acpi_scan_handler *handler)
95{
96 if (!handler)
97 return -EINVAL;
98
99 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
100 return 0;
101}
102
103int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
104 const char *hotplug_profile_name)
105{
106 int error;
107
108 error = acpi_scan_add_handler(handler);
109 if (error)
110 return error;
111
112 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
113 return 0;
114}
115
116bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
117{
118 struct acpi_device_physical_node *pn;
119 bool offline = true;
120 char *envp[] = { "EVENT=offline", NULL };
121
122 /*
123 * acpi_container_offline() calls this for all of the container's
124 * children under the container's physical_node_lock lock.
125 */
126 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
127
128 list_for_each_entry(pn, &adev->physical_node_list, node)
129 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
130 if (uevent)
131 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
132
133 offline = false;
134 break;
135 }
136
137 mutex_unlock(&adev->physical_node_lock);
138 return offline;
139}
140
141static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
142 void **ret_p)
143{
144 struct acpi_device *device = NULL;
145 struct acpi_device_physical_node *pn;
146 bool second_pass = (bool)data;
147 acpi_status status = AE_OK;
148
149 if (acpi_bus_get_device(handle, &device))
150 return AE_OK;
151
152 if (device->handler && !device->handler->hotplug.enabled) {
153 *ret_p = &device->dev;
154 return AE_SUPPORT;
155 }
156
157 mutex_lock(&device->physical_node_lock);
158
159 list_for_each_entry(pn, &device->physical_node_list, node) {
160 int ret;
161
162 if (second_pass) {
163 /* Skip devices offlined by the first pass. */
164 if (pn->put_online)
165 continue;
166 } else {
167 pn->put_online = false;
168 }
169 ret = device_offline(pn->dev);
170 if (ret >= 0) {
171 pn->put_online = !ret;
172 } else {
173 *ret_p = pn->dev;
174 if (second_pass) {
175 status = AE_ERROR;
176 break;
177 }
178 }
179 }
180
181 mutex_unlock(&device->physical_node_lock);
182
183 return status;
184}
185
186static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
187 void **ret_p)
188{
189 struct acpi_device *device = NULL;
190 struct acpi_device_physical_node *pn;
191
192 if (acpi_bus_get_device(handle, &device))
193 return AE_OK;
194
195 mutex_lock(&device->physical_node_lock);
196
197 list_for_each_entry(pn, &device->physical_node_list, node)
198 if (pn->put_online) {
199 device_online(pn->dev);
200 pn->put_online = false;
201 }
202
203 mutex_unlock(&device->physical_node_lock);
204
205 return AE_OK;
206}
207
208static int acpi_scan_try_to_offline(struct acpi_device *device)
209{
210 acpi_handle handle = device->handle;
211 struct device *errdev = NULL;
212 acpi_status status;
213
214 /*
215 * Carry out two passes here and ignore errors in the first pass,
216 * because if the devices in question are memory blocks and
217 * CONFIG_MEMCG is set, one of the blocks may hold data structures
218 * that the other blocks depend on, but it is not known in advance which
219 * block holds them.
220 *
221 * If the first pass is successful, the second one isn't needed, though.
222 */
223 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
224 NULL, acpi_bus_offline, (void *)false,
225 (void **)&errdev);
226 if (status == AE_SUPPORT) {
227 dev_warn(errdev, "Offline disabled.\n");
228 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
229 acpi_bus_online, NULL, NULL, NULL);
230 return -EPERM;
231 }
232 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
233 if (errdev) {
234 errdev = NULL;
235 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
236 NULL, acpi_bus_offline, (void *)true,
237 (void **)&errdev);
238 if (!errdev)
239 acpi_bus_offline(handle, 0, (void *)true,
240 (void **)&errdev);
241
242 if (errdev) {
243 dev_warn(errdev, "Offline failed.\n");
244 acpi_bus_online(handle, 0, NULL, NULL);
245 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
246 ACPI_UINT32_MAX, acpi_bus_online,
247 NULL, NULL, NULL);
248 return -EBUSY;
249 }
250 }
251 return 0;
252}
253
254static int acpi_scan_hot_remove(struct acpi_device *device)
255{
256 acpi_handle handle = device->handle;
257 unsigned long long sta;
258 acpi_status status;
259
260 if (device->handler && device->handler->hotplug.demand_offline) {
261 if (!acpi_scan_is_offline(device, true))
262 return -EBUSY;
263 } else {
264 int error = acpi_scan_try_to_offline(device);
265 if (error)
266 return error;
267 }
268
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270 "Hot-removing device %s...\n", dev_name(&device->dev)));
271
272 acpi_bus_trim(device);
273
274 acpi_evaluate_lck(handle, 0);
275 /*
276 * TBD: _EJD support.
277 */
278 status = acpi_evaluate_ej0(handle);
279 if (status == AE_NOT_FOUND)
280 return -ENODEV;
281 else if (ACPI_FAILURE(status))
282 return -EIO;
283
284 /*
285 * Verify if eject was indeed successful. If not, log an error
286 * message. No need to call _OST since _EJ0 call was made OK.
287 */
288 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
289 if (ACPI_FAILURE(status)) {
290 acpi_handle_warn(handle,
291 "Status check after eject failed (0x%x)\n", status);
292 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
293 acpi_handle_warn(handle,
294 "Eject incomplete - status 0x%llx\n", sta);
295 }
296
297 return 0;
298}
299
300static int acpi_scan_device_not_present(struct acpi_device *adev)
301{
302 if (!acpi_device_enumerated(adev)) {
303 dev_warn(&adev->dev, "Still not present\n");
304 return -EALREADY;
305 }
306 acpi_bus_trim(adev);
307 return 0;
308}
309
310static int acpi_scan_device_check(struct acpi_device *adev)
311{
312 int error;
313
314 acpi_bus_get_status(adev);
315 if (adev->status.present || adev->status.functional) {
316 /*
317 * This function is only called for device objects for which
318 * matching scan handlers exist. The only situation in which
319 * the scan handler is not attached to this device object yet
320 * is when the device has just appeared (either it wasn't
321 * present at all before or it was removed and then added
322 * again).
323 */
324 if (adev->handler) {
325 dev_warn(&adev->dev, "Already enumerated\n");
326 return -EALREADY;
327 }
328 error = acpi_bus_scan(adev->handle);
329 if (error) {
330 dev_warn(&adev->dev, "Namespace scan failure\n");
331 return error;
332 }
333 if (!adev->handler) {
334 dev_warn(&adev->dev, "Enumeration failure\n");
335 error = -ENODEV;
336 }
337 } else {
338 error = acpi_scan_device_not_present(adev);
339 }
340 return error;
341}
342
343static int acpi_scan_bus_check(struct acpi_device *adev)
344{
345 struct acpi_scan_handler *handler = adev->handler;
346 struct acpi_device *child;
347 int error;
348
349 acpi_bus_get_status(adev);
350 if (!(adev->status.present || adev->status.functional)) {
351 acpi_scan_device_not_present(adev);
352 return 0;
353 }
354 if (handler && handler->hotplug.scan_dependent)
355 return handler->hotplug.scan_dependent(adev);
356
357 error = acpi_bus_scan(adev->handle);
358 if (error) {
359 dev_warn(&adev->dev, "Namespace scan failure\n");
360 return error;
361 }
362 list_for_each_entry(child, &adev->children, node) {
363 error = acpi_scan_bus_check(child);
364 if (error)
365 return error;
366 }
367 return 0;
368}
369
370static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
371{
372 switch (type) {
373 case ACPI_NOTIFY_BUS_CHECK:
374 return acpi_scan_bus_check(adev);
375 case ACPI_NOTIFY_DEVICE_CHECK:
376 return acpi_scan_device_check(adev);
377 case ACPI_NOTIFY_EJECT_REQUEST:
378 case ACPI_OST_EC_OSPM_EJECT:
379 if (adev->handler && !adev->handler->hotplug.enabled) {
380 dev_info(&adev->dev, "Eject disabled\n");
381 return -EPERM;
382 }
383 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
384 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
385 return acpi_scan_hot_remove(adev);
386 }
387 return -EINVAL;
388}
389
390void acpi_device_hotplug(struct acpi_device *adev, u32 src)
391{
392 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
393 int error = -ENODEV;
394
395 lock_device_hotplug();
396 mutex_lock(&acpi_scan_lock);
397
398 /*
399 * The device object's ACPI handle cannot become invalid as long as we
400 * are holding acpi_scan_lock, but it might have become invalid before
401 * that lock was acquired.
402 */
403 if (adev->handle == INVALID_ACPI_HANDLE)
404 goto err_out;
405
406 if (adev->flags.is_dock_station) {
407 error = dock_notify(adev, src);
408 } else if (adev->flags.hotplug_notify) {
409 error = acpi_generic_hotplug_event(adev, src);
410 } else {
411 int (*notify)(struct acpi_device *, u32);
412
413 acpi_lock_hp_context();
414 notify = adev->hp ? adev->hp->notify : NULL;
415 acpi_unlock_hp_context();
416 /*
417 * There may be additional notify handlers for device objects
418 * without the .event() callback, so ignore them here.
419 */
420 if (notify)
421 error = notify(adev, src);
422 else
423 goto out;
424 }
425 switch (error) {
426 case 0:
427 ost_code = ACPI_OST_SC_SUCCESS;
428 break;
429 case -EPERM:
430 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
431 break;
432 case -EBUSY:
433 ost_code = ACPI_OST_SC_DEVICE_BUSY;
434 break;
435 default:
436 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
437 break;
438 }
439
440 err_out:
441 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
442
443 out:
444 acpi_bus_put_acpi_device(adev);
445 mutex_unlock(&acpi_scan_lock);
446 unlock_device_hotplug();
447}
448
449static void acpi_free_power_resources_lists(struct acpi_device *device)
450{
451 int i;
452
453 if (device->wakeup.flags.valid)
454 acpi_power_resources_list_free(&device->wakeup.resources);
455
456 if (!device->power.flags.power_resources)
457 return;
458
459 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
460 struct acpi_device_power_state *ps = &device->power.states[i];
461 acpi_power_resources_list_free(&ps->resources);
462 }
463}
464
465static void acpi_device_release(struct device *dev)
466{
467 struct acpi_device *acpi_dev = to_acpi_device(dev);
468
469 acpi_free_properties(acpi_dev);
470 acpi_free_pnp_ids(&acpi_dev->pnp);
471 acpi_free_power_resources_lists(acpi_dev);
472 kfree(acpi_dev);
473}
474
475static void acpi_device_del(struct acpi_device *device)
476{
477 struct acpi_device_bus_id *acpi_device_bus_id;
478
479 mutex_lock(&acpi_device_lock);
480 if (device->parent)
481 list_del(&device->node);
482
483 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
484 if (!strcmp(acpi_device_bus_id->bus_id,
485 acpi_device_hid(device))) {
486 if (acpi_device_bus_id->instance_no > 0)
487 acpi_device_bus_id->instance_no--;
488 else {
489 list_del(&acpi_device_bus_id->node);
490 kfree(acpi_device_bus_id);
491 }
492 break;
493 }
494
495 list_del(&device->wakeup_list);
496 mutex_unlock(&acpi_device_lock);
497
498 acpi_power_add_remove_device(device, false);
499 acpi_device_remove_files(device);
500 if (device->remove)
501 device->remove(device);
502
503 device_del(&device->dev);
504}
505
506static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
507
508static LIST_HEAD(acpi_device_del_list);
509static DEFINE_MUTEX(acpi_device_del_lock);
510
511static void acpi_device_del_work_fn(struct work_struct *work_not_used)
512{
513 for (;;) {
514 struct acpi_device *adev;
515
516 mutex_lock(&acpi_device_del_lock);
517
518 if (list_empty(&acpi_device_del_list)) {
519 mutex_unlock(&acpi_device_del_lock);
520 break;
521 }
522 adev = list_first_entry(&acpi_device_del_list,
523 struct acpi_device, del_list);
524 list_del(&adev->del_list);
525
526 mutex_unlock(&acpi_device_del_lock);
527
528 blocking_notifier_call_chain(&acpi_reconfig_chain,
529 ACPI_RECONFIG_DEVICE_REMOVE, adev);
530
531 acpi_device_del(adev);
532 /*
533 * Drop references to all power resources that might have been
534 * used by the device.
535 */
536 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
537 put_device(&adev->dev);
538 }
539}
540
541/**
542 * acpi_scan_drop_device - Drop an ACPI device object.
543 * @handle: Handle of an ACPI namespace node, not used.
544 * @context: Address of the ACPI device object to drop.
545 *
546 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
547 * namespace node the device object pointed to by @context is attached to.
548 *
549 * The unregistration is carried out asynchronously to avoid running
550 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
551 * ensure the correct ordering (the device objects must be unregistered in the
552 * same order in which the corresponding namespace nodes are deleted).
553 */
554static void acpi_scan_drop_device(acpi_handle handle, void *context)
555{
556 static DECLARE_WORK(work, acpi_device_del_work_fn);
557 struct acpi_device *adev = context;
558
559 mutex_lock(&acpi_device_del_lock);
560
561 /*
562 * Use the ACPI hotplug workqueue which is ordered, so this work item
563 * won't run after any hotplug work items submitted subsequently. That
564 * prevents attempts to register device objects identical to those being
565 * deleted from happening concurrently (such attempts result from
566 * hotplug events handled via the ACPI hotplug workqueue). It also will
567 * run after all of the work items submitted previosuly, which helps
568 * those work items to ensure that they are not accessing stale device
569 * objects.
570 */
571 if (list_empty(&acpi_device_del_list))
572 acpi_queue_hotplug_work(&work);
573
574 list_add_tail(&adev->del_list, &acpi_device_del_list);
575 /* Make acpi_ns_validate_handle() return NULL for this handle. */
576 adev->handle = INVALID_ACPI_HANDLE;
577
578 mutex_unlock(&acpi_device_del_lock);
579}
580
581static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
582 void (*callback)(void *))
583{
584 acpi_status status;
585
586 if (!device)
587 return -EINVAL;
588
589 status = acpi_get_data_full(handle, acpi_scan_drop_device,
590 (void **)device, callback);
591 if (ACPI_FAILURE(status) || !*device) {
592 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
593 handle));
594 return -ENODEV;
595 }
596 return 0;
597}
598
599int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
600{
601 return acpi_get_device_data(handle, device, NULL);
602}
603EXPORT_SYMBOL(acpi_bus_get_device);
604
605static void get_acpi_device(void *dev)
606{
607 if (dev)
608 get_device(&((struct acpi_device *)dev)->dev);
609}
610
611struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
612{
613 struct acpi_device *adev = NULL;
614
615 acpi_get_device_data(handle, &adev, get_acpi_device);
616 return adev;
617}
618
619void acpi_bus_put_acpi_device(struct acpi_device *adev)
620{
621 put_device(&adev->dev);
622}
623
624int acpi_device_add(struct acpi_device *device,
625 void (*release)(struct device *))
626{
627 int result;
628 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
629 int found = 0;
630
631 if (device->handle) {
632 acpi_status status;
633
634 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
635 device);
636 if (ACPI_FAILURE(status)) {
637 acpi_handle_err(device->handle,
638 "Unable to attach device data\n");
639 return -ENODEV;
640 }
641 }
642
643 /*
644 * Linkage
645 * -------
646 * Link this device to its parent and siblings.
647 */
648 INIT_LIST_HEAD(&device->children);
649 INIT_LIST_HEAD(&device->node);
650 INIT_LIST_HEAD(&device->wakeup_list);
651 INIT_LIST_HEAD(&device->physical_node_list);
652 INIT_LIST_HEAD(&device->del_list);
653 mutex_init(&device->physical_node_lock);
654
655 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
656 if (!new_bus_id) {
657 pr_err(PREFIX "Memory allocation error\n");
658 result = -ENOMEM;
659 goto err_detach;
660 }
661
662 mutex_lock(&acpi_device_lock);
663 /*
664 * Find suitable bus_id and instance number in acpi_bus_id_list
665 * If failed, create one and link it into acpi_bus_id_list
666 */
667 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
668 if (!strcmp(acpi_device_bus_id->bus_id,
669 acpi_device_hid(device))) {
670 acpi_device_bus_id->instance_no++;
671 found = 1;
672 kfree(new_bus_id);
673 break;
674 }
675 }
676 if (!found) {
677 acpi_device_bus_id = new_bus_id;
678 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
679 acpi_device_bus_id->instance_no = 0;
680 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
681 }
682 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
683
684 if (device->parent)
685 list_add_tail(&device->node, &device->parent->children);
686
687 if (device->wakeup.flags.valid)
688 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
689 mutex_unlock(&acpi_device_lock);
690
691 if (device->parent)
692 device->dev.parent = &device->parent->dev;
693 device->dev.bus = &acpi_bus_type;
694 device->dev.release = release;
695 result = device_add(&device->dev);
696 if (result) {
697 dev_err(&device->dev, "Error registering device\n");
698 goto err;
699 }
700
701 result = acpi_device_setup_files(device);
702 if (result)
703 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
704 dev_name(&device->dev));
705
706 return 0;
707
708 err:
709 mutex_lock(&acpi_device_lock);
710 if (device->parent)
711 list_del(&device->node);
712 list_del(&device->wakeup_list);
713 mutex_unlock(&acpi_device_lock);
714
715 err_detach:
716 acpi_detach_data(device->handle, acpi_scan_drop_device);
717 return result;
718}
719
720/* --------------------------------------------------------------------------
721 Device Enumeration
722 -------------------------------------------------------------------------- */
723static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
724{
725 struct acpi_device *device = NULL;
726 acpi_status status;
727
728 /*
729 * Fixed hardware devices do not appear in the namespace and do not
730 * have handles, but we fabricate acpi_devices for them, so we have
731 * to deal with them specially.
732 */
733 if (!handle)
734 return acpi_root;
735
736 do {
737 status = acpi_get_parent(handle, &handle);
738 if (ACPI_FAILURE(status))
739 return status == AE_NULL_ENTRY ? NULL : acpi_root;
740 } while (acpi_bus_get_device(handle, &device));
741 return device;
742}
743
744acpi_status
745acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
746{
747 acpi_status status;
748 acpi_handle tmp;
749 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
750 union acpi_object *obj;
751
752 status = acpi_get_handle(handle, "_EJD", &tmp);
753 if (ACPI_FAILURE(status))
754 return status;
755
756 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
757 if (ACPI_SUCCESS(status)) {
758 obj = buffer.pointer;
759 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
760 ejd);
761 kfree(buffer.pointer);
762 }
763 return status;
764}
765EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
766
767static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
768{
769 acpi_handle handle = dev->handle;
770 struct acpi_device_wakeup *wakeup = &dev->wakeup;
771 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
772 union acpi_object *package = NULL;
773 union acpi_object *element = NULL;
774 acpi_status status;
775 int err = -ENODATA;
776
777 INIT_LIST_HEAD(&wakeup->resources);
778
779 /* _PRW */
780 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
781 if (ACPI_FAILURE(status)) {
782 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
783 return err;
784 }
785
786 package = (union acpi_object *)buffer.pointer;
787
788 if (!package || package->package.count < 2)
789 goto out;
790
791 element = &(package->package.elements[0]);
792 if (!element)
793 goto out;
794
795 if (element->type == ACPI_TYPE_PACKAGE) {
796 if ((element->package.count < 2) ||
797 (element->package.elements[0].type !=
798 ACPI_TYPE_LOCAL_REFERENCE)
799 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
800 goto out;
801
802 wakeup->gpe_device =
803 element->package.elements[0].reference.handle;
804 wakeup->gpe_number =
805 (u32) element->package.elements[1].integer.value;
806 } else if (element->type == ACPI_TYPE_INTEGER) {
807 wakeup->gpe_device = NULL;
808 wakeup->gpe_number = element->integer.value;
809 } else {
810 goto out;
811 }
812
813 element = &(package->package.elements[1]);
814 if (element->type != ACPI_TYPE_INTEGER)
815 goto out;
816
817 wakeup->sleep_state = element->integer.value;
818
819 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
820 if (err)
821 goto out;
822
823 if (!list_empty(&wakeup->resources)) {
824 int sleep_state;
825
826 err = acpi_power_wakeup_list_init(&wakeup->resources,
827 &sleep_state);
828 if (err) {
829 acpi_handle_warn(handle, "Retrieving current states "
830 "of wakeup power resources failed\n");
831 acpi_power_resources_list_free(&wakeup->resources);
832 goto out;
833 }
834 if (sleep_state < wakeup->sleep_state) {
835 acpi_handle_warn(handle, "Overriding _PRW sleep state "
836 "(S%d) by S%d from power resources\n",
837 (int)wakeup->sleep_state, sleep_state);
838 wakeup->sleep_state = sleep_state;
839 }
840 }
841
842 out:
843 kfree(buffer.pointer);
844 return err;
845}
846
847static bool acpi_wakeup_gpe_init(struct acpi_device *device)
848{
849 static const struct acpi_device_id button_device_ids[] = {
850 {"PNP0C0C", 0}, /* Power button */
851 {"PNP0C0D", 0}, /* Lid */
852 {"PNP0C0E", 0}, /* Sleep button */
853 {"", 0},
854 };
855 struct acpi_device_wakeup *wakeup = &device->wakeup;
856 acpi_status status;
857
858 wakeup->flags.notifier_present = 0;
859
860 /* Power button, Lid switch always enable wakeup */
861 if (!acpi_match_device_ids(device, button_device_ids)) {
862 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
863 /* Do not use Lid/sleep button for S5 wakeup */
864 if (wakeup->sleep_state == ACPI_STATE_S5)
865 wakeup->sleep_state = ACPI_STATE_S4;
866 }
867 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
868 device_set_wakeup_capable(&device->dev, true);
869 return true;
870 }
871
872 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
873 wakeup->gpe_number);
874 return ACPI_SUCCESS(status);
875}
876
877static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
878{
879 int err;
880
881 /* Presence of _PRW indicates wake capable */
882 if (!acpi_has_method(device->handle, "_PRW"))
883 return;
884
885 err = acpi_bus_extract_wakeup_device_power_package(device);
886 if (err) {
887 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
888 return;
889 }
890
891 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
892 device->wakeup.prepare_count = 0;
893 /*
894 * Call _PSW/_DSW object to disable its ability to wake the sleeping
895 * system for the ACPI device with the _PRW object.
896 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
897 * So it is necessary to call _DSW object first. Only when it is not
898 * present will the _PSW object used.
899 */
900 err = acpi_device_sleep_wake(device, 0, 0, 0);
901 if (err)
902 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
903 "error in _DSW or _PSW evaluation\n"));
904}
905
906static void acpi_bus_init_power_state(struct acpi_device *device, int state)
907{
908 struct acpi_device_power_state *ps = &device->power.states[state];
909 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
910 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
911 acpi_status status;
912
913 INIT_LIST_HEAD(&ps->resources);
914
915 /* Evaluate "_PRx" to get referenced power resources */
916 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
917 if (ACPI_SUCCESS(status)) {
918 union acpi_object *package = buffer.pointer;
919
920 if (buffer.length && package
921 && package->type == ACPI_TYPE_PACKAGE
922 && package->package.count) {
923 int err = acpi_extract_power_resources(package, 0,
924 &ps->resources);
925 if (!err)
926 device->power.flags.power_resources = 1;
927 }
928 ACPI_FREE(buffer.pointer);
929 }
930
931 /* Evaluate "_PSx" to see if we can do explicit sets */
932 pathname[2] = 'S';
933 if (acpi_has_method(device->handle, pathname))
934 ps->flags.explicit_set = 1;
935
936 /* State is valid if there are means to put the device into it. */
937 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
938 ps->flags.valid = 1;
939
940 ps->power = -1; /* Unknown - driver assigned */
941 ps->latency = -1; /* Unknown - driver assigned */
942}
943
944static void acpi_bus_get_power_flags(struct acpi_device *device)
945{
946 u32 i;
947
948 /* Presence of _PS0|_PR0 indicates 'power manageable' */
949 if (!acpi_has_method(device->handle, "_PS0") &&
950 !acpi_has_method(device->handle, "_PR0"))
951 return;
952
953 device->flags.power_manageable = 1;
954
955 /*
956 * Power Management Flags
957 */
958 if (acpi_has_method(device->handle, "_PSC"))
959 device->power.flags.explicit_get = 1;
960
961 if (acpi_has_method(device->handle, "_IRC"))
962 device->power.flags.inrush_current = 1;
963
964 if (acpi_has_method(device->handle, "_DSW"))
965 device->power.flags.dsw_present = 1;
966
967 /*
968 * Enumerate supported power management states
969 */
970 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
971 acpi_bus_init_power_state(device, i);
972
973 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
974 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
975 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
976
977 /* Set defaults for D0 and D3hot states (always valid) */
978 device->power.states[ACPI_STATE_D0].flags.valid = 1;
979 device->power.states[ACPI_STATE_D0].power = 100;
980 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
981
982 if (acpi_bus_init_power(device))
983 device->flags.power_manageable = 0;
984}
985
986static void acpi_bus_get_flags(struct acpi_device *device)
987{
988 /* Presence of _STA indicates 'dynamic_status' */
989 if (acpi_has_method(device->handle, "_STA"))
990 device->flags.dynamic_status = 1;
991
992 /* Presence of _RMV indicates 'removable' */
993 if (acpi_has_method(device->handle, "_RMV"))
994 device->flags.removable = 1;
995
996 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
997 if (acpi_has_method(device->handle, "_EJD") ||
998 acpi_has_method(device->handle, "_EJ0"))
999 device->flags.ejectable = 1;
1000}
1001
1002static void acpi_device_get_busid(struct acpi_device *device)
1003{
1004 char bus_id[5] = { '?', 0 };
1005 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1006 int i = 0;
1007
1008 /*
1009 * Bus ID
1010 * ------
1011 * The device's Bus ID is simply the object name.
1012 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1013 */
1014 if (ACPI_IS_ROOT_DEVICE(device)) {
1015 strcpy(device->pnp.bus_id, "ACPI");
1016 return;
1017 }
1018
1019 switch (device->device_type) {
1020 case ACPI_BUS_TYPE_POWER_BUTTON:
1021 strcpy(device->pnp.bus_id, "PWRF");
1022 break;
1023 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1024 strcpy(device->pnp.bus_id, "SLPF");
1025 break;
1026 case ACPI_BUS_TYPE_ECDT_EC:
1027 strcpy(device->pnp.bus_id, "ECDT");
1028 break;
1029 default:
1030 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1031 /* Clean up trailing underscores (if any) */
1032 for (i = 3; i > 1; i--) {
1033 if (bus_id[i] == '_')
1034 bus_id[i] = '\0';
1035 else
1036 break;
1037 }
1038 strcpy(device->pnp.bus_id, bus_id);
1039 break;
1040 }
1041}
1042
1043/*
1044 * acpi_ata_match - see if an acpi object is an ATA device
1045 *
1046 * If an acpi object has one of the ACPI ATA methods defined,
1047 * then we can safely call it an ATA device.
1048 */
1049bool acpi_ata_match(acpi_handle handle)
1050{
1051 return acpi_has_method(handle, "_GTF") ||
1052 acpi_has_method(handle, "_GTM") ||
1053 acpi_has_method(handle, "_STM") ||
1054 acpi_has_method(handle, "_SDD");
1055}
1056
1057/*
1058 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1059 *
1060 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1061 * then we can safely call it an ejectable drive bay
1062 */
1063bool acpi_bay_match(acpi_handle handle)
1064{
1065 acpi_handle phandle;
1066
1067 if (!acpi_has_method(handle, "_EJ0"))
1068 return false;
1069 if (acpi_ata_match(handle))
1070 return true;
1071 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1072 return false;
1073
1074 return acpi_ata_match(phandle);
1075}
1076
1077bool acpi_device_is_battery(struct acpi_device *adev)
1078{
1079 struct acpi_hardware_id *hwid;
1080
1081 list_for_each_entry(hwid, &adev->pnp.ids, list)
1082 if (!strcmp("PNP0C0A", hwid->id))
1083 return true;
1084
1085 return false;
1086}
1087
1088static bool is_ejectable_bay(struct acpi_device *adev)
1089{
1090 acpi_handle handle = adev->handle;
1091
1092 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1093 return true;
1094
1095 return acpi_bay_match(handle);
1096}
1097
1098/*
1099 * acpi_dock_match - see if an acpi object has a _DCK method
1100 */
1101bool acpi_dock_match(acpi_handle handle)
1102{
1103 return acpi_has_method(handle, "_DCK");
1104}
1105
1106static acpi_status
1107acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1108 void **return_value)
1109{
1110 long *cap = context;
1111
1112 if (acpi_has_method(handle, "_BCM") &&
1113 acpi_has_method(handle, "_BCL")) {
1114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1115 "support\n"));
1116 *cap |= ACPI_VIDEO_BACKLIGHT;
1117 /* We have backlight support, no need to scan further */
1118 return AE_CTRL_TERMINATE;
1119 }
1120 return 0;
1121}
1122
1123/* Returns true if the ACPI object is a video device which can be
1124 * handled by video.ko.
1125 * The device will get a Linux specific CID added in scan.c to
1126 * identify the device as an ACPI graphics device
1127 * Be aware that the graphics device may not be physically present
1128 * Use acpi_video_get_capabilities() to detect general ACPI video
1129 * capabilities of present cards
1130 */
1131long acpi_is_video_device(acpi_handle handle)
1132{
1133 long video_caps = 0;
1134
1135 /* Is this device able to support video switching ? */
1136 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1137 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1138
1139 /* Is this device able to retrieve a video ROM ? */
1140 if (acpi_has_method(handle, "_ROM"))
1141 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1142
1143 /* Is this device able to configure which video head to be POSTed ? */
1144 if (acpi_has_method(handle, "_VPO") &&
1145 acpi_has_method(handle, "_GPD") &&
1146 acpi_has_method(handle, "_SPD"))
1147 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1148
1149 /* Only check for backlight functionality if one of the above hit. */
1150 if (video_caps)
1151 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1152 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1153 &video_caps, NULL);
1154
1155 return video_caps;
1156}
1157EXPORT_SYMBOL(acpi_is_video_device);
1158
1159const char *acpi_device_hid(struct acpi_device *device)
1160{
1161 struct acpi_hardware_id *hid;
1162
1163 if (list_empty(&device->pnp.ids))
1164 return dummy_hid;
1165
1166 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1167 return hid->id;
1168}
1169EXPORT_SYMBOL(acpi_device_hid);
1170
1171static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1172{
1173 struct acpi_hardware_id *id;
1174
1175 id = kmalloc(sizeof(*id), GFP_KERNEL);
1176 if (!id)
1177 return;
1178
1179 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1180 if (!id->id) {
1181 kfree(id);
1182 return;
1183 }
1184
1185 list_add_tail(&id->list, &pnp->ids);
1186 pnp->type.hardware_id = 1;
1187}
1188
1189/*
1190 * Old IBM workstations have a DSDT bug wherein the SMBus object
1191 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1192 * prefix. Work around this.
1193 */
1194static bool acpi_ibm_smbus_match(acpi_handle handle)
1195{
1196 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1197 struct acpi_buffer path = { sizeof(node_name), node_name };
1198
1199 if (!dmi_name_in_vendors("IBM"))
1200 return false;
1201
1202 /* Look for SMBS object */
1203 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1204 strcmp("SMBS", path.pointer))
1205 return false;
1206
1207 /* Does it have the necessary (but misnamed) methods? */
1208 if (acpi_has_method(handle, "SBI") &&
1209 acpi_has_method(handle, "SBR") &&
1210 acpi_has_method(handle, "SBW"))
1211 return true;
1212
1213 return false;
1214}
1215
1216static bool acpi_object_is_system_bus(acpi_handle handle)
1217{
1218 acpi_handle tmp;
1219
1220 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1221 tmp == handle)
1222 return true;
1223 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1224 tmp == handle)
1225 return true;
1226
1227 return false;
1228}
1229
1230static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1231 int device_type)
1232{
1233 acpi_status status;
1234 struct acpi_device_info *info;
1235 struct acpi_pnp_device_id_list *cid_list;
1236 int i;
1237
1238 switch (device_type) {
1239 case ACPI_BUS_TYPE_DEVICE:
1240 if (handle == ACPI_ROOT_OBJECT) {
1241 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1242 break;
1243 }
1244
1245 status = acpi_get_object_info(handle, &info);
1246 if (ACPI_FAILURE(status)) {
1247 pr_err(PREFIX "%s: Error reading device info\n",
1248 __func__);
1249 return;
1250 }
1251
1252 if (info->valid & ACPI_VALID_HID) {
1253 acpi_add_id(pnp, info->hardware_id.string);
1254 pnp->type.platform_id = 1;
1255 }
1256 if (info->valid & ACPI_VALID_CID) {
1257 cid_list = &info->compatible_id_list;
1258 for (i = 0; i < cid_list->count; i++)
1259 acpi_add_id(pnp, cid_list->ids[i].string);
1260 }
1261 if (info->valid & ACPI_VALID_ADR) {
1262 pnp->bus_address = info->address;
1263 pnp->type.bus_address = 1;
1264 }
1265 if (info->valid & ACPI_VALID_UID)
1266 pnp->unique_id = kstrdup(info->unique_id.string,
1267 GFP_KERNEL);
1268 if (info->valid & ACPI_VALID_CLS)
1269 acpi_add_id(pnp, info->class_code.string);
1270
1271 kfree(info);
1272
1273 /*
1274 * Some devices don't reliably have _HIDs & _CIDs, so add
1275 * synthetic HIDs to make sure drivers can find them.
1276 */
1277 if (acpi_is_video_device(handle))
1278 acpi_add_id(pnp, ACPI_VIDEO_HID);
1279 else if (acpi_bay_match(handle))
1280 acpi_add_id(pnp, ACPI_BAY_HID);
1281 else if (acpi_dock_match(handle))
1282 acpi_add_id(pnp, ACPI_DOCK_HID);
1283 else if (acpi_ibm_smbus_match(handle))
1284 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1285 else if (list_empty(&pnp->ids) &&
1286 acpi_object_is_system_bus(handle)) {
1287 /* \_SB, \_TZ, LNXSYBUS */
1288 acpi_add_id(pnp, ACPI_BUS_HID);
1289 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1290 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1291 }
1292
1293 break;
1294 case ACPI_BUS_TYPE_POWER:
1295 acpi_add_id(pnp, ACPI_POWER_HID);
1296 break;
1297 case ACPI_BUS_TYPE_PROCESSOR:
1298 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1299 break;
1300 case ACPI_BUS_TYPE_THERMAL:
1301 acpi_add_id(pnp, ACPI_THERMAL_HID);
1302 break;
1303 case ACPI_BUS_TYPE_POWER_BUTTON:
1304 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1305 break;
1306 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1307 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1308 break;
1309 case ACPI_BUS_TYPE_ECDT_EC:
1310 acpi_add_id(pnp, ACPI_ECDT_HID);
1311 break;
1312 }
1313}
1314
1315void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1316{
1317 struct acpi_hardware_id *id, *tmp;
1318
1319 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1320 kfree_const(id->id);
1321 kfree(id);
1322 }
1323 kfree(pnp->unique_id);
1324}
1325
1326/**
1327 * acpi_dma_supported - Check DMA support for the specified device.
1328 * @adev: The pointer to acpi device
1329 *
1330 * Return false if DMA is not supported. Otherwise, return true
1331 */
1332bool acpi_dma_supported(struct acpi_device *adev)
1333{
1334 if (!adev)
1335 return false;
1336
1337 if (adev->flags.cca_seen)
1338 return true;
1339
1340 /*
1341 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1342 * DMA on "Intel platforms". Presumably that includes all x86 and
1343 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1344 */
1345 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1346 return true;
1347
1348 return false;
1349}
1350
1351/**
1352 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1353 * @adev: The pointer to acpi device
1354 *
1355 * Return enum dev_dma_attr.
1356 */
1357enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1358{
1359 if (!acpi_dma_supported(adev))
1360 return DEV_DMA_NOT_SUPPORTED;
1361
1362 if (adev->flags.coherent_dma)
1363 return DEV_DMA_COHERENT;
1364 else
1365 return DEV_DMA_NON_COHERENT;
1366}
1367
1368/**
1369 * acpi_dma_get_range() - Get device DMA parameters.
1370 *
1371 * @dev: device to configure
1372 * @dma_addr: pointer device DMA address result
1373 * @offset: pointer to the DMA offset result
1374 * @size: pointer to DMA range size result
1375 *
1376 * Evaluate DMA regions and return respectively DMA region start, offset
1377 * and size in dma_addr, offset and size on parsing success; it does not
1378 * update the passed in values on failure.
1379 *
1380 * Return 0 on success, < 0 on failure.
1381 */
1382int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
1383 u64 *size)
1384{
1385 struct acpi_device *adev;
1386 LIST_HEAD(list);
1387 struct resource_entry *rentry;
1388 int ret;
1389 struct device *dma_dev = dev;
1390 u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
1391
1392 /*
1393 * Walk the device tree chasing an ACPI companion with a _DMA
1394 * object while we go. Stop if we find a device with an ACPI
1395 * companion containing a _DMA method.
1396 */
1397 do {
1398 adev = ACPI_COMPANION(dma_dev);
1399 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1400 break;
1401
1402 dma_dev = dma_dev->parent;
1403 } while (dma_dev);
1404
1405 if (!dma_dev)
1406 return -ENODEV;
1407
1408 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1409 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1410 return -EINVAL;
1411 }
1412
1413 ret = acpi_dev_get_dma_resources(adev, &list);
1414 if (ret > 0) {
1415 list_for_each_entry(rentry, &list, node) {
1416 if (dma_offset && rentry->offset != dma_offset) {
1417 ret = -EINVAL;
1418 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
1419 goto out;
1420 }
1421 dma_offset = rentry->offset;
1422
1423 /* Take lower and upper limits */
1424 if (rentry->res->start < dma_start)
1425 dma_start = rentry->res->start;
1426 if (rentry->res->end > dma_end)
1427 dma_end = rentry->res->end;
1428 }
1429
1430 if (dma_start >= dma_end) {
1431 ret = -EINVAL;
1432 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1433 goto out;
1434 }
1435
1436 *dma_addr = dma_start - dma_offset;
1437 len = dma_end - dma_start;
1438 *size = max(len, len + 1);
1439 *offset = dma_offset;
1440 }
1441 out:
1442 acpi_dev_free_resource_list(&list);
1443
1444 return ret >= 0 ? 0 : ret;
1445}
1446
1447/**
1448 * acpi_dma_configure - Set-up DMA configuration for the device.
1449 * @dev: The pointer to the device
1450 * @attr: device dma attributes
1451 */
1452int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1453{
1454 const struct iommu_ops *iommu;
1455 u64 dma_addr = 0, size = 0;
1456
1457 if (attr == DEV_DMA_NOT_SUPPORTED) {
1458 set_dma_ops(dev, &dma_dummy_ops);
1459 return 0;
1460 }
1461
1462 iort_dma_setup(dev, &dma_addr, &size);
1463
1464 iommu = iort_iommu_configure(dev);
1465 if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
1466 return -EPROBE_DEFER;
1467
1468 arch_setup_dma_ops(dev, dma_addr, size,
1469 iommu, attr == DEV_DMA_COHERENT);
1470
1471 return 0;
1472}
1473EXPORT_SYMBOL_GPL(acpi_dma_configure);
1474
1475static void acpi_init_coherency(struct acpi_device *adev)
1476{
1477 unsigned long long cca = 0;
1478 acpi_status status;
1479 struct acpi_device *parent = adev->parent;
1480
1481 if (parent && parent->flags.cca_seen) {
1482 /*
1483 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1484 * already saw one.
1485 */
1486 adev->flags.cca_seen = 1;
1487 cca = parent->flags.coherent_dma;
1488 } else {
1489 status = acpi_evaluate_integer(adev->handle, "_CCA",
1490 NULL, &cca);
1491 if (ACPI_SUCCESS(status))
1492 adev->flags.cca_seen = 1;
1493 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1494 /*
1495 * If architecture does not specify that _CCA is
1496 * required for DMA-able devices (e.g. x86),
1497 * we default to _CCA=1.
1498 */
1499 cca = 1;
1500 else
1501 acpi_handle_debug(adev->handle,
1502 "ACPI device is missing _CCA.\n");
1503 }
1504
1505 adev->flags.coherent_dma = cca;
1506}
1507
1508static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1509{
1510 bool *is_serial_bus_slave_p = data;
1511
1512 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1513 return 1;
1514
1515 *is_serial_bus_slave_p = true;
1516
1517 /* no need to do more checking */
1518 return -1;
1519}
1520
1521static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1522{
1523 struct acpi_device *parent = device->parent;
1524 static const struct acpi_device_id indirect_io_hosts[] = {
1525 {"HISI0191", 0},
1526 {}
1527 };
1528
1529 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1530}
1531
1532static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1533{
1534 struct list_head resource_list;
1535 bool is_serial_bus_slave = false;
1536 /*
1537 * These devices have multiple I2cSerialBus resources and an i2c-client
1538 * must be instantiated for each, each with its own i2c_device_id.
1539 * Normally we only instantiate an i2c-client for the first resource,
1540 * using the ACPI HID as id. These special cases are handled by the
1541 * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
1542 * which i2c_device_id to use for each resource.
1543 */
1544 static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
1545 {"BSG1160", },
1546 {"BSG2150", },
1547 {"INT33FE", },
1548 {"INT3515", },
1549 {}
1550 };
1551
1552 if (acpi_is_indirect_io_slave(device))
1553 return true;
1554
1555 /* Macs use device properties in lieu of _CRS resources */
1556 if (x86_apple_machine &&
1557 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1558 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1559 fwnode_property_present(&device->fwnode, "baud")))
1560 return true;
1561
1562 /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
1563 if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
1564 return false;
1565
1566 INIT_LIST_HEAD(&resource_list);
1567 acpi_dev_get_resources(device, &resource_list,
1568 acpi_check_serial_bus_slave,
1569 &is_serial_bus_slave);
1570 acpi_dev_free_resource_list(&resource_list);
1571
1572 return is_serial_bus_slave;
1573}
1574
1575void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1576 int type, unsigned long long sta)
1577{
1578 INIT_LIST_HEAD(&device->pnp.ids);
1579 device->device_type = type;
1580 device->handle = handle;
1581 device->parent = acpi_bus_get_parent(handle);
1582 device->fwnode.ops = &acpi_device_fwnode_ops;
1583 acpi_set_device_status(device, sta);
1584 acpi_device_get_busid(device);
1585 acpi_set_pnp_ids(handle, &device->pnp, type);
1586 acpi_init_properties(device);
1587 acpi_bus_get_flags(device);
1588 device->flags.match_driver = false;
1589 device->flags.initialized = true;
1590 device->flags.enumeration_by_parent =
1591 acpi_device_enumeration_by_parent(device);
1592 acpi_device_clear_enumerated(device);
1593 device_initialize(&device->dev);
1594 dev_set_uevent_suppress(&device->dev, true);
1595 acpi_init_coherency(device);
1596 /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1597 device->dep_unmet = 1;
1598}
1599
1600void acpi_device_add_finalize(struct acpi_device *device)
1601{
1602 dev_set_uevent_suppress(&device->dev, false);
1603 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1604}
1605
1606static int acpi_add_single_object(struct acpi_device **child,
1607 acpi_handle handle, int type,
1608 unsigned long long sta)
1609{
1610 int result;
1611 struct acpi_device *device;
1612 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1613
1614 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1615 if (!device) {
1616 printk(KERN_ERR PREFIX "Memory allocation error\n");
1617 return -ENOMEM;
1618 }
1619
1620 acpi_init_device_object(device, handle, type, sta);
1621 /*
1622 * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1623 * that we can call acpi_bus_get_status() and use its quirk handling.
1624 * Note this must be done before the get power-/wakeup_dev-flags calls.
1625 */
1626 if (type == ACPI_BUS_TYPE_DEVICE)
1627 if (acpi_bus_get_status(device) < 0)
1628 acpi_set_device_status(device, 0);
1629
1630 acpi_bus_get_power_flags(device);
1631 acpi_bus_get_wakeup_device_flags(device);
1632
1633 result = acpi_device_add(device, acpi_device_release);
1634 if (result) {
1635 acpi_device_release(&device->dev);
1636 return result;
1637 }
1638
1639 acpi_power_add_remove_device(device, true);
1640 acpi_device_add_finalize(device);
1641 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1642 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1643 dev_name(&device->dev), (char *) buffer.pointer,
1644 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1645 kfree(buffer.pointer);
1646 *child = device;
1647 return 0;
1648}
1649
1650static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1651 void *context)
1652{
1653 struct resource *res = context;
1654
1655 if (acpi_dev_resource_memory(ares, res))
1656 return AE_CTRL_TERMINATE;
1657
1658 return AE_OK;
1659}
1660
1661static bool acpi_device_should_be_hidden(acpi_handle handle)
1662{
1663 acpi_status status;
1664 struct resource res;
1665
1666 /* Check if it should ignore the UART device */
1667 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1668 return false;
1669
1670 /*
1671 * The UART device described in SPCR table is assumed to have only one
1672 * memory resource present. So we only look for the first one here.
1673 */
1674 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1675 acpi_get_resource_memory, &res);
1676 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1677 return false;
1678
1679 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1680 &res.start);
1681
1682 return true;
1683}
1684
1685static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1686 unsigned long long *sta)
1687{
1688 acpi_status status;
1689 acpi_object_type acpi_type;
1690
1691 status = acpi_get_type(handle, &acpi_type);
1692 if (ACPI_FAILURE(status))
1693 return -ENODEV;
1694
1695 switch (acpi_type) {
1696 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1697 case ACPI_TYPE_DEVICE:
1698 if (acpi_device_should_be_hidden(handle))
1699 return -ENODEV;
1700
1701 *type = ACPI_BUS_TYPE_DEVICE;
1702 /*
1703 * acpi_add_single_object updates this once we've an acpi_device
1704 * so that acpi_bus_get_status' quirk handling can be used.
1705 */
1706 *sta = ACPI_STA_DEFAULT;
1707 break;
1708 case ACPI_TYPE_PROCESSOR:
1709 *type = ACPI_BUS_TYPE_PROCESSOR;
1710 status = acpi_bus_get_status_handle(handle, sta);
1711 if (ACPI_FAILURE(status))
1712 return -ENODEV;
1713 break;
1714 case ACPI_TYPE_THERMAL:
1715 *type = ACPI_BUS_TYPE_THERMAL;
1716 *sta = ACPI_STA_DEFAULT;
1717 break;
1718 case ACPI_TYPE_POWER:
1719 *type = ACPI_BUS_TYPE_POWER;
1720 *sta = ACPI_STA_DEFAULT;
1721 break;
1722 default:
1723 return -ENODEV;
1724 }
1725
1726 return 0;
1727}
1728
1729bool acpi_device_is_present(const struct acpi_device *adev)
1730{
1731 return adev->status.present || adev->status.functional;
1732}
1733
1734static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1735 const char *idstr,
1736 const struct acpi_device_id **matchid)
1737{
1738 const struct acpi_device_id *devid;
1739
1740 if (handler->match)
1741 return handler->match(idstr, matchid);
1742
1743 for (devid = handler->ids; devid->id[0]; devid++)
1744 if (!strcmp((char *)devid->id, idstr)) {
1745 if (matchid)
1746 *matchid = devid;
1747
1748 return true;
1749 }
1750
1751 return false;
1752}
1753
1754static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1755 const struct acpi_device_id **matchid)
1756{
1757 struct acpi_scan_handler *handler;
1758
1759 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1760 if (acpi_scan_handler_matching(handler, idstr, matchid))
1761 return handler;
1762
1763 return NULL;
1764}
1765
1766void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1767{
1768 if (!!hotplug->enabled == !!val)
1769 return;
1770
1771 mutex_lock(&acpi_scan_lock);
1772
1773 hotplug->enabled = val;
1774
1775 mutex_unlock(&acpi_scan_lock);
1776}
1777
1778static void acpi_scan_init_hotplug(struct acpi_device *adev)
1779{
1780 struct acpi_hardware_id *hwid;
1781
1782 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1783 acpi_dock_add(adev);
1784 return;
1785 }
1786 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1787 struct acpi_scan_handler *handler;
1788
1789 handler = acpi_scan_match_handler(hwid->id, NULL);
1790 if (handler) {
1791 adev->flags.hotplug_notify = true;
1792 break;
1793 }
1794 }
1795}
1796
1797static void acpi_device_dep_initialize(struct acpi_device *adev)
1798{
1799 struct acpi_dep_data *dep;
1800 struct acpi_handle_list dep_devices;
1801 acpi_status status;
1802 int i;
1803
1804 adev->dep_unmet = 0;
1805
1806 if (!acpi_has_method(adev->handle, "_DEP"))
1807 return;
1808
1809 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1810 &dep_devices);
1811 if (ACPI_FAILURE(status)) {
1812 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1813 return;
1814 }
1815
1816 for (i = 0; i < dep_devices.count; i++) {
1817 struct acpi_device_info *info;
1818 int skip;
1819
1820 status = acpi_get_object_info(dep_devices.handles[i], &info);
1821 if (ACPI_FAILURE(status)) {
1822 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1823 continue;
1824 }
1825
1826 /*
1827 * Skip the dependency of Windows System Power
1828 * Management Controller
1829 */
1830 skip = info->valid & ACPI_VALID_HID &&
1831 !strcmp(info->hardware_id.string, "INT3396");
1832
1833 kfree(info);
1834
1835 if (skip)
1836 continue;
1837
1838 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1839 if (!dep)
1840 return;
1841
1842 dep->master = dep_devices.handles[i];
1843 dep->slave = adev->handle;
1844 adev->dep_unmet++;
1845
1846 mutex_lock(&acpi_dep_list_lock);
1847 list_add_tail(&dep->node , &acpi_dep_list);
1848 mutex_unlock(&acpi_dep_list_lock);
1849 }
1850}
1851
1852static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1853 void *not_used, void **return_value)
1854{
1855 struct acpi_device *device = NULL;
1856 int type;
1857 unsigned long long sta;
1858 int result;
1859
1860 acpi_bus_get_device(handle, &device);
1861 if (device)
1862 goto out;
1863
1864 result = acpi_bus_type_and_status(handle, &type, &sta);
1865 if (result)
1866 return AE_OK;
1867
1868 if (type == ACPI_BUS_TYPE_POWER) {
1869 acpi_add_power_resource(handle);
1870 return AE_OK;
1871 }
1872
1873 acpi_add_single_object(&device, handle, type, sta);
1874 if (!device)
1875 return AE_CTRL_DEPTH;
1876
1877 acpi_scan_init_hotplug(device);
1878 acpi_device_dep_initialize(device);
1879
1880 out:
1881 if (!*return_value)
1882 *return_value = device;
1883
1884 return AE_OK;
1885}
1886
1887static void acpi_default_enumeration(struct acpi_device *device)
1888{
1889 /*
1890 * Do not enumerate devices with enumeration_by_parent flag set as
1891 * they will be enumerated by their respective parents.
1892 */
1893 if (!device->flags.enumeration_by_parent) {
1894 acpi_create_platform_device(device, NULL);
1895 acpi_device_set_enumerated(device);
1896 } else {
1897 blocking_notifier_call_chain(&acpi_reconfig_chain,
1898 ACPI_RECONFIG_DEVICE_ADD, device);
1899 }
1900}
1901
1902static const struct acpi_device_id generic_device_ids[] = {
1903 {ACPI_DT_NAMESPACE_HID, },
1904 {"", },
1905};
1906
1907static int acpi_generic_device_attach(struct acpi_device *adev,
1908 const struct acpi_device_id *not_used)
1909{
1910 /*
1911 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1912 * below can be unconditional.
1913 */
1914 if (adev->data.of_compatible)
1915 acpi_default_enumeration(adev);
1916
1917 return 1;
1918}
1919
1920static struct acpi_scan_handler generic_device_handler = {
1921 .ids = generic_device_ids,
1922 .attach = acpi_generic_device_attach,
1923};
1924
1925static int acpi_scan_attach_handler(struct acpi_device *device)
1926{
1927 struct acpi_hardware_id *hwid;
1928 int ret = 0;
1929
1930 list_for_each_entry(hwid, &device->pnp.ids, list) {
1931 const struct acpi_device_id *devid;
1932 struct acpi_scan_handler *handler;
1933
1934 handler = acpi_scan_match_handler(hwid->id, &devid);
1935 if (handler) {
1936 if (!handler->attach) {
1937 device->pnp.type.platform_id = 0;
1938 continue;
1939 }
1940 device->handler = handler;
1941 ret = handler->attach(device, devid);
1942 if (ret > 0)
1943 break;
1944
1945 device->handler = NULL;
1946 if (ret < 0)
1947 break;
1948 }
1949 }
1950
1951 return ret;
1952}
1953
1954static void acpi_bus_attach(struct acpi_device *device)
1955{
1956 struct acpi_device *child;
1957 acpi_handle ejd;
1958 int ret;
1959
1960 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1961 register_dock_dependent_device(device, ejd);
1962
1963 acpi_bus_get_status(device);
1964 /* Skip devices that are not present. */
1965 if (!acpi_device_is_present(device)) {
1966 device->flags.initialized = false;
1967 acpi_device_clear_enumerated(device);
1968 device->flags.power_manageable = 0;
1969 return;
1970 }
1971 if (device->handler)
1972 goto ok;
1973
1974 if (!device->flags.initialized) {
1975 device->flags.power_manageable =
1976 device->power.states[ACPI_STATE_D0].flags.valid;
1977 if (acpi_bus_init_power(device))
1978 device->flags.power_manageable = 0;
1979
1980 device->flags.initialized = true;
1981 } else if (device->flags.visited) {
1982 goto ok;
1983 }
1984
1985 ret = acpi_scan_attach_handler(device);
1986 if (ret < 0)
1987 return;
1988
1989 device->flags.match_driver = true;
1990 if (ret > 0 && !device->flags.enumeration_by_parent) {
1991 acpi_device_set_enumerated(device);
1992 goto ok;
1993 }
1994
1995 ret = device_attach(&device->dev);
1996 if (ret < 0)
1997 return;
1998
1999 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2000 acpi_default_enumeration(device);
2001 else
2002 acpi_device_set_enumerated(device);
2003
2004 ok:
2005 list_for_each_entry(child, &device->children, node)
2006 acpi_bus_attach(child);
2007
2008 if (device->handler && device->handler->hotplug.notify_online)
2009 device->handler->hotplug.notify_online(device);
2010}
2011
2012void acpi_walk_dep_device_list(acpi_handle handle)
2013{
2014 struct acpi_dep_data *dep, *tmp;
2015 struct acpi_device *adev;
2016
2017 mutex_lock(&acpi_dep_list_lock);
2018 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2019 if (dep->master == handle) {
2020 acpi_bus_get_device(dep->slave, &adev);
2021 if (!adev)
2022 continue;
2023
2024 adev->dep_unmet--;
2025 if (!adev->dep_unmet)
2026 acpi_bus_attach(adev);
2027 list_del(&dep->node);
2028 kfree(dep);
2029 }
2030 }
2031 mutex_unlock(&acpi_dep_list_lock);
2032}
2033EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2034
2035/**
2036 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2037 * @handle: Root of the namespace scope to scan.
2038 *
2039 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2040 * found devices.
2041 *
2042 * If no devices were found, -ENODEV is returned, but it does not mean that
2043 * there has been a real error. There just have been no suitable ACPI objects
2044 * in the table trunk from which the kernel could create a device and add an
2045 * appropriate driver.
2046 *
2047 * Must be called under acpi_scan_lock.
2048 */
2049int acpi_bus_scan(acpi_handle handle)
2050{
2051 void *device = NULL;
2052
2053 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2054 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2055 acpi_bus_check_add, NULL, NULL, &device);
2056
2057 if (device) {
2058 acpi_bus_attach(device);
2059 return 0;
2060 }
2061 return -ENODEV;
2062}
2063EXPORT_SYMBOL(acpi_bus_scan);
2064
2065/**
2066 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2067 * @adev: Root of the ACPI namespace scope to walk.
2068 *
2069 * Must be called under acpi_scan_lock.
2070 */
2071void acpi_bus_trim(struct acpi_device *adev)
2072{
2073 struct acpi_scan_handler *handler = adev->handler;
2074 struct acpi_device *child;
2075
2076 list_for_each_entry_reverse(child, &adev->children, node)
2077 acpi_bus_trim(child);
2078
2079 adev->flags.match_driver = false;
2080 if (handler) {
2081 if (handler->detach)
2082 handler->detach(adev);
2083
2084 adev->handler = NULL;
2085 } else {
2086 device_release_driver(&adev->dev);
2087 }
2088 /*
2089 * Most likely, the device is going away, so put it into D3cold before
2090 * that.
2091 */
2092 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2093 adev->flags.initialized = false;
2094 acpi_device_clear_enumerated(adev);
2095}
2096EXPORT_SYMBOL_GPL(acpi_bus_trim);
2097
2098int acpi_bus_register_early_device(int type)
2099{
2100 struct acpi_device *device = NULL;
2101 int result;
2102
2103 result = acpi_add_single_object(&device, NULL,
2104 type, ACPI_STA_DEFAULT);
2105 if (result)
2106 return result;
2107
2108 device->flags.match_driver = true;
2109 return device_attach(&device->dev);
2110}
2111EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2112
2113static int acpi_bus_scan_fixed(void)
2114{
2115 int result = 0;
2116
2117 /*
2118 * Enumerate all fixed-feature devices.
2119 */
2120 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2121 struct acpi_device *device = NULL;
2122
2123 result = acpi_add_single_object(&device, NULL,
2124 ACPI_BUS_TYPE_POWER_BUTTON,
2125 ACPI_STA_DEFAULT);
2126 if (result)
2127 return result;
2128
2129 device->flags.match_driver = true;
2130 result = device_attach(&device->dev);
2131 if (result < 0)
2132 return result;
2133
2134 device_init_wakeup(&device->dev, true);
2135 }
2136
2137 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2138 struct acpi_device *device = NULL;
2139
2140 result = acpi_add_single_object(&device, NULL,
2141 ACPI_BUS_TYPE_SLEEP_BUTTON,
2142 ACPI_STA_DEFAULT);
2143 if (result)
2144 return result;
2145
2146 device->flags.match_driver = true;
2147 result = device_attach(&device->dev);
2148 }
2149
2150 return result < 0 ? result : 0;
2151}
2152
2153static void __init acpi_get_spcr_uart_addr(void)
2154{
2155 acpi_status status;
2156 struct acpi_table_spcr *spcr_ptr;
2157
2158 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2159 (struct acpi_table_header **)&spcr_ptr);
2160 if (ACPI_SUCCESS(status))
2161 spcr_uart_addr = spcr_ptr->serial_port.address;
2162 else
2163 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2164}
2165
2166static bool acpi_scan_initialized;
2167
2168int __init acpi_scan_init(void)
2169{
2170 int result;
2171 acpi_status status;
2172 struct acpi_table_stao *stao_ptr;
2173
2174 acpi_pci_root_init();
2175 acpi_pci_link_init();
2176 acpi_processor_init();
2177 acpi_lpss_init();
2178 acpi_apd_init();
2179 acpi_cmos_rtc_init();
2180 acpi_container_init();
2181 acpi_memory_hotplug_init();
2182 acpi_watchdog_init();
2183 acpi_pnp_init();
2184 acpi_int340x_thermal_init();
2185 acpi_amba_init();
2186 acpi_init_lpit();
2187
2188 acpi_scan_add_handler(&generic_device_handler);
2189
2190 /*
2191 * If there is STAO table, check whether it needs to ignore the UART
2192 * device in SPCR table.
2193 */
2194 status = acpi_get_table(ACPI_SIG_STAO, 0,
2195 (struct acpi_table_header **)&stao_ptr);
2196 if (ACPI_SUCCESS(status)) {
2197 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2198 printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2199
2200 if (stao_ptr->ignore_uart)
2201 acpi_get_spcr_uart_addr();
2202 }
2203
2204 acpi_gpe_apply_masked_gpes();
2205 acpi_update_all_gpes();
2206
2207 /*
2208 * Although we call __add_memory() that is documented to require the
2209 * device_hotplug_lock, it is not necessary here because this is an
2210 * early code when userspace or any other code path cannot trigger
2211 * hotplug/hotunplug operations.
2212 */
2213 mutex_lock(&acpi_scan_lock);
2214 /*
2215 * Enumerate devices in the ACPI namespace.
2216 */
2217 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2218 if (result)
2219 goto out;
2220
2221 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2222 if (result)
2223 goto out;
2224
2225 /* Fixed feature devices do not exist on HW-reduced platform */
2226 if (!acpi_gbl_reduced_hardware) {
2227 result = acpi_bus_scan_fixed();
2228 if (result) {
2229 acpi_detach_data(acpi_root->handle,
2230 acpi_scan_drop_device);
2231 acpi_device_del(acpi_root);
2232 put_device(&acpi_root->dev);
2233 goto out;
2234 }
2235 }
2236
2237 acpi_scan_initialized = true;
2238
2239 out:
2240 mutex_unlock(&acpi_scan_lock);
2241 return result;
2242}
2243
2244static struct acpi_probe_entry *ape;
2245static int acpi_probe_count;
2246static DEFINE_MUTEX(acpi_probe_mutex);
2247
2248static int __init acpi_match_madt(union acpi_subtable_headers *header,
2249 const unsigned long end)
2250{
2251 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2252 if (!ape->probe_subtbl(header, end))
2253 acpi_probe_count++;
2254
2255 return 0;
2256}
2257
2258int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2259{
2260 int count = 0;
2261
2262 if (acpi_disabled)
2263 return 0;
2264
2265 mutex_lock(&acpi_probe_mutex);
2266 for (ape = ap_head; nr; ape++, nr--) {
2267 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2268 acpi_probe_count = 0;
2269 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2270 count += acpi_probe_count;
2271 } else {
2272 int res;
2273 res = acpi_table_parse(ape->id, ape->probe_table);
2274 if (!res)
2275 count++;
2276 }
2277 }
2278 mutex_unlock(&acpi_probe_mutex);
2279
2280 return count;
2281}
2282
2283struct acpi_table_events_work {
2284 struct work_struct work;
2285 void *table;
2286 u32 event;
2287};
2288
2289static void acpi_table_events_fn(struct work_struct *work)
2290{
2291 struct acpi_table_events_work *tew;
2292
2293 tew = container_of(work, struct acpi_table_events_work, work);
2294
2295 if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2296 acpi_scan_lock_acquire();
2297 acpi_bus_scan(ACPI_ROOT_OBJECT);
2298 acpi_scan_lock_release();
2299 }
2300
2301 kfree(tew);
2302}
2303
2304void acpi_scan_table_handler(u32 event, void *table, void *context)
2305{
2306 struct acpi_table_events_work *tew;
2307
2308 if (!acpi_scan_initialized)
2309 return;
2310
2311 if (event != ACPI_TABLE_EVENT_LOAD)
2312 return;
2313
2314 tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2315 if (!tew)
2316 return;
2317
2318 INIT_WORK(&tew->work, acpi_table_events_fn);
2319 tew->table = table;
2320 tew->event = event;
2321
2322 schedule_work(&tew->work);
2323}
2324
2325int acpi_reconfig_notifier_register(struct notifier_block *nb)
2326{
2327 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2328}
2329EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2330
2331int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2332{
2333 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2334}
2335EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);