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1/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <linux/acpi.h>
10#include <linux/signal.h>
11#include <linux/kthread.h>
12#include <linux/dmi.h>
13
14#include <acpi/acpi_drivers.h>
15
16#include "internal.h"
17
18#define _COMPONENT ACPI_BUS_COMPONENT
19ACPI_MODULE_NAME("scan");
20#define STRUCT_TO_INT(s) (*((int*)&s))
21extern struct acpi_device *acpi_root;
22
23#define ACPI_BUS_CLASS "system_bus"
24#define ACPI_BUS_HID "LNXSYBUS"
25#define ACPI_BUS_DEVICE_NAME "System Bus"
26
27#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
28
29static const char *dummy_hid = "device";
30
31static LIST_HEAD(acpi_device_list);
32static LIST_HEAD(acpi_bus_id_list);
33DEFINE_MUTEX(acpi_device_lock);
34LIST_HEAD(acpi_wakeup_device_list);
35
36struct acpi_device_bus_id{
37 char bus_id[15];
38 unsigned int instance_no;
39 struct list_head node;
40};
41
42/*
43 * Creates hid/cid(s) string needed for modalias and uevent
44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45 * char *modalias: "acpi:IBM0001:ACPI0001"
46*/
47static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
48 int size)
49{
50 int len;
51 int count;
52 struct acpi_hardware_id *id;
53
54 if (list_empty(&acpi_dev->pnp.ids))
55 return 0;
56
57 len = snprintf(modalias, size, "acpi:");
58 size -= len;
59
60 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
61 count = snprintf(&modalias[len], size, "%s:", id->id);
62 if (count < 0 || count >= size)
63 return -EINVAL;
64 len += count;
65 size -= count;
66 }
67
68 modalias[len] = '\0';
69 return len;
70}
71
72static ssize_t
73acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
74 struct acpi_device *acpi_dev = to_acpi_device(dev);
75 int len;
76
77 /* Device has no HID and no CID or string is >1024 */
78 len = create_modalias(acpi_dev, buf, 1024);
79 if (len <= 0)
80 return 0;
81 buf[len++] = '\n';
82 return len;
83}
84static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
85
86static void acpi_bus_hot_remove_device(void *context)
87{
88 struct acpi_device *device;
89 acpi_handle handle = context;
90 struct acpi_object_list arg_list;
91 union acpi_object arg;
92 acpi_status status = AE_OK;
93
94 if (acpi_bus_get_device(handle, &device))
95 return;
96
97 if (!device)
98 return;
99
100 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
101 "Hot-removing device %s...\n", dev_name(&device->dev)));
102
103 if (acpi_bus_trim(device, 1)) {
104 printk(KERN_ERR PREFIX
105 "Removing device failed\n");
106 return;
107 }
108
109 /* power off device */
110 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
111 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
112 printk(KERN_WARNING PREFIX
113 "Power-off device failed\n");
114
115 if (device->flags.lockable) {
116 arg_list.count = 1;
117 arg_list.pointer = &arg;
118 arg.type = ACPI_TYPE_INTEGER;
119 arg.integer.value = 0;
120 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
121 }
122
123 arg_list.count = 1;
124 arg_list.pointer = &arg;
125 arg.type = ACPI_TYPE_INTEGER;
126 arg.integer.value = 1;
127
128 /*
129 * TBD: _EJD support.
130 */
131 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
132 if (ACPI_FAILURE(status))
133 printk(KERN_WARNING PREFIX
134 "Eject device failed\n");
135
136 return;
137}
138
139static ssize_t
140acpi_eject_store(struct device *d, struct device_attribute *attr,
141 const char *buf, size_t count)
142{
143 int ret = count;
144 acpi_status status;
145 acpi_object_type type = 0;
146 struct acpi_device *acpi_device = to_acpi_device(d);
147
148 if ((!count) || (buf[0] != '1')) {
149 return -EINVAL;
150 }
151#ifndef FORCE_EJECT
152 if (acpi_device->driver == NULL) {
153 ret = -ENODEV;
154 goto err;
155 }
156#endif
157 status = acpi_get_type(acpi_device->handle, &type);
158 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
159 ret = -ENODEV;
160 goto err;
161 }
162
163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
164err:
165 return ret;
166}
167
168static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
169
170static ssize_t
171acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
172 struct acpi_device *acpi_dev = to_acpi_device(dev);
173
174 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
175}
176static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
177
178static ssize_t
179acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
180 struct acpi_device *acpi_dev = to_acpi_device(dev);
181 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
182 int result;
183
184 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
185 if (result)
186 goto end;
187
188 result = sprintf(buf, "%s\n", (char*)path.pointer);
189 kfree(path.pointer);
190end:
191 return result;
192}
193static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
194
195static int acpi_device_setup_files(struct acpi_device *dev)
196{
197 acpi_status status;
198 acpi_handle temp;
199 int result = 0;
200
201 /*
202 * Devices gotten from FADT don't have a "path" attribute
203 */
204 if (dev->handle) {
205 result = device_create_file(&dev->dev, &dev_attr_path);
206 if (result)
207 goto end;
208 }
209
210 if (!list_empty(&dev->pnp.ids)) {
211 result = device_create_file(&dev->dev, &dev_attr_hid);
212 if (result)
213 goto end;
214
215 result = device_create_file(&dev->dev, &dev_attr_modalias);
216 if (result)
217 goto end;
218 }
219
220 /*
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
223 */
224 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225 if (ACPI_SUCCESS(status))
226 result = device_create_file(&dev->dev, &dev_attr_eject);
227end:
228 return result;
229}
230
231static void acpi_device_remove_files(struct acpi_device *dev)
232{
233 acpi_status status;
234 acpi_handle temp;
235
236 /*
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
239 */
240 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241 if (ACPI_SUCCESS(status))
242 device_remove_file(&dev->dev, &dev_attr_eject);
243
244 device_remove_file(&dev->dev, &dev_attr_modalias);
245 device_remove_file(&dev->dev, &dev_attr_hid);
246 if (dev->handle)
247 device_remove_file(&dev->dev, &dev_attr_path);
248}
249/* --------------------------------------------------------------------------
250 ACPI Bus operations
251 -------------------------------------------------------------------------- */
252
253int acpi_match_device_ids(struct acpi_device *device,
254 const struct acpi_device_id *ids)
255{
256 const struct acpi_device_id *id;
257 struct acpi_hardware_id *hwid;
258
259 /*
260 * If the device is not present, it is unnecessary to load device
261 * driver for it.
262 */
263 if (!device->status.present)
264 return -ENODEV;
265
266 for (id = ids; id->id[0]; id++)
267 list_for_each_entry(hwid, &device->pnp.ids, list)
268 if (!strcmp((char *) id->id, hwid->id))
269 return 0;
270
271 return -ENOENT;
272}
273EXPORT_SYMBOL(acpi_match_device_ids);
274
275static void acpi_free_ids(struct acpi_device *device)
276{
277 struct acpi_hardware_id *id, *tmp;
278
279 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
280 kfree(id->id);
281 kfree(id);
282 }
283}
284
285static void acpi_device_release(struct device *dev)
286{
287 struct acpi_device *acpi_dev = to_acpi_device(dev);
288
289 acpi_free_ids(acpi_dev);
290 kfree(acpi_dev);
291}
292
293static int acpi_device_suspend(struct device *dev, pm_message_t state)
294{
295 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 struct acpi_driver *acpi_drv = acpi_dev->driver;
297
298 if (acpi_drv && acpi_drv->ops.suspend)
299 return acpi_drv->ops.suspend(acpi_dev, state);
300 return 0;
301}
302
303static int acpi_device_resume(struct device *dev)
304{
305 struct acpi_device *acpi_dev = to_acpi_device(dev);
306 struct acpi_driver *acpi_drv = acpi_dev->driver;
307
308 if (acpi_drv && acpi_drv->ops.resume)
309 return acpi_drv->ops.resume(acpi_dev);
310 return 0;
311}
312
313static int acpi_bus_match(struct device *dev, struct device_driver *drv)
314{
315 struct acpi_device *acpi_dev = to_acpi_device(dev);
316 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
317
318 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
319}
320
321static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
322{
323 struct acpi_device *acpi_dev = to_acpi_device(dev);
324 int len;
325
326 if (list_empty(&acpi_dev->pnp.ids))
327 return 0;
328
329 if (add_uevent_var(env, "MODALIAS="))
330 return -ENOMEM;
331 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
332 sizeof(env->buf) - env->buflen);
333 if (len >= (sizeof(env->buf) - env->buflen))
334 return -ENOMEM;
335 env->buflen += len;
336 return 0;
337}
338
339static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
340{
341 struct acpi_device *device = data;
342
343 device->driver->ops.notify(device, event);
344}
345
346static acpi_status acpi_device_notify_fixed(void *data)
347{
348 struct acpi_device *device = data;
349
350 /* Fixed hardware devices have no handles */
351 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
352 return AE_OK;
353}
354
355static int acpi_device_install_notify_handler(struct acpi_device *device)
356{
357 acpi_status status;
358
359 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
360 status =
361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
362 acpi_device_notify_fixed,
363 device);
364 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
365 status =
366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367 acpi_device_notify_fixed,
368 device);
369 else
370 status = acpi_install_notify_handler(device->handle,
371 ACPI_DEVICE_NOTIFY,
372 acpi_device_notify,
373 device);
374
375 if (ACPI_FAILURE(status))
376 return -EINVAL;
377 return 0;
378}
379
380static void acpi_device_remove_notify_handler(struct acpi_device *device)
381{
382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
384 acpi_device_notify_fixed);
385 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed);
388 else
389 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
390 acpi_device_notify);
391}
392
393static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
394static int acpi_start_single_object(struct acpi_device *);
395static int acpi_device_probe(struct device * dev)
396{
397 struct acpi_device *acpi_dev = to_acpi_device(dev);
398 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
399 int ret;
400
401 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
402 if (!ret) {
403 if (acpi_dev->bus_ops.acpi_op_start)
404 acpi_start_single_object(acpi_dev);
405
406 if (acpi_drv->ops.notify) {
407 ret = acpi_device_install_notify_handler(acpi_dev);
408 if (ret) {
409 if (acpi_drv->ops.remove)
410 acpi_drv->ops.remove(acpi_dev,
411 acpi_dev->removal_type);
412 return ret;
413 }
414 }
415
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "Found driver [%s] for device [%s]\n",
418 acpi_drv->name, acpi_dev->pnp.bus_id));
419 get_device(dev);
420 }
421 return ret;
422}
423
424static int acpi_device_remove(struct device * dev)
425{
426 struct acpi_device *acpi_dev = to_acpi_device(dev);
427 struct acpi_driver *acpi_drv = acpi_dev->driver;
428
429 if (acpi_drv) {
430 if (acpi_drv->ops.notify)
431 acpi_device_remove_notify_handler(acpi_dev);
432 if (acpi_drv->ops.remove)
433 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
434 }
435 acpi_dev->driver = NULL;
436 acpi_dev->driver_data = NULL;
437
438 put_device(dev);
439 return 0;
440}
441
442struct bus_type acpi_bus_type = {
443 .name = "acpi",
444 .suspend = acpi_device_suspend,
445 .resume = acpi_device_resume,
446 .match = acpi_bus_match,
447 .probe = acpi_device_probe,
448 .remove = acpi_device_remove,
449 .uevent = acpi_device_uevent,
450};
451
452static int acpi_device_register(struct acpi_device *device)
453{
454 int result;
455 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
456 int found = 0;
457
458 /*
459 * Linkage
460 * -------
461 * Link this device to its parent and siblings.
462 */
463 INIT_LIST_HEAD(&device->children);
464 INIT_LIST_HEAD(&device->node);
465 INIT_LIST_HEAD(&device->wakeup_list);
466
467 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
468 if (!new_bus_id) {
469 printk(KERN_ERR PREFIX "Memory allocation error\n");
470 return -ENOMEM;
471 }
472
473 mutex_lock(&acpi_device_lock);
474 /*
475 * Find suitable bus_id and instance number in acpi_bus_id_list
476 * If failed, create one and link it into acpi_bus_id_list
477 */
478 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
479 if (!strcmp(acpi_device_bus_id->bus_id,
480 acpi_device_hid(device))) {
481 acpi_device_bus_id->instance_no++;
482 found = 1;
483 kfree(new_bus_id);
484 break;
485 }
486 }
487 if (!found) {
488 acpi_device_bus_id = new_bus_id;
489 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
490 acpi_device_bus_id->instance_no = 0;
491 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
492 }
493 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
494
495 if (device->parent)
496 list_add_tail(&device->node, &device->parent->children);
497
498 if (device->wakeup.flags.valid)
499 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
500 mutex_unlock(&acpi_device_lock);
501
502 if (device->parent)
503 device->dev.parent = &device->parent->dev;
504 device->dev.bus = &acpi_bus_type;
505 device->dev.release = &acpi_device_release;
506 result = device_register(&device->dev);
507 if (result) {
508 dev_err(&device->dev, "Error registering device\n");
509 goto end;
510 }
511
512 result = acpi_device_setup_files(device);
513 if (result)
514 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
515 dev_name(&device->dev));
516
517 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
518 return 0;
519end:
520 mutex_lock(&acpi_device_lock);
521 if (device->parent)
522 list_del(&device->node);
523 list_del(&device->wakeup_list);
524 mutex_unlock(&acpi_device_lock);
525 return result;
526}
527
528static void acpi_device_unregister(struct acpi_device *device, int type)
529{
530 mutex_lock(&acpi_device_lock);
531 if (device->parent)
532 list_del(&device->node);
533
534 list_del(&device->wakeup_list);
535 mutex_unlock(&acpi_device_lock);
536
537 acpi_detach_data(device->handle, acpi_bus_data_handler);
538
539 acpi_device_remove_files(device);
540 device_unregister(&device->dev);
541}
542
543/* --------------------------------------------------------------------------
544 Driver Management
545 -------------------------------------------------------------------------- */
546/**
547 * acpi_bus_driver_init - add a device to a driver
548 * @device: the device to add and initialize
549 * @driver: driver for the device
550 *
551 * Used to initialize a device via its device driver. Called whenever a
552 * driver is bound to a device. Invokes the driver's add() ops.
553 */
554static int
555acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
556{
557 int result = 0;
558
559 if (!device || !driver)
560 return -EINVAL;
561
562 if (!driver->ops.add)
563 return -ENOSYS;
564
565 result = driver->ops.add(device);
566 if (result) {
567 device->driver = NULL;
568 device->driver_data = NULL;
569 return result;
570 }
571
572 device->driver = driver;
573
574 /*
575 * TBD - Configuration Management: Assign resources to device based
576 * upon possible configuration and currently allocated resources.
577 */
578
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580 "Driver successfully bound to device\n"));
581 return 0;
582}
583
584static int acpi_start_single_object(struct acpi_device *device)
585{
586 int result = 0;
587 struct acpi_driver *driver;
588
589
590 if (!(driver = device->driver))
591 return 0;
592
593 if (driver->ops.start) {
594 result = driver->ops.start(device);
595 if (result && driver->ops.remove)
596 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
597 }
598
599 return result;
600}
601
602/**
603 * acpi_bus_register_driver - register a driver with the ACPI bus
604 * @driver: driver being registered
605 *
606 * Registers a driver with the ACPI bus. Searches the namespace for all
607 * devices that match the driver's criteria and binds. Returns zero for
608 * success or a negative error status for failure.
609 */
610int acpi_bus_register_driver(struct acpi_driver *driver)
611{
612 int ret;
613
614 if (acpi_disabled)
615 return -ENODEV;
616 driver->drv.name = driver->name;
617 driver->drv.bus = &acpi_bus_type;
618 driver->drv.owner = driver->owner;
619
620 ret = driver_register(&driver->drv);
621 return ret;
622}
623
624EXPORT_SYMBOL(acpi_bus_register_driver);
625
626/**
627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628 * @driver: driver to unregister
629 *
630 * Unregisters a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and unbinds.
632 */
633void acpi_bus_unregister_driver(struct acpi_driver *driver)
634{
635 driver_unregister(&driver->drv);
636}
637
638EXPORT_SYMBOL(acpi_bus_unregister_driver);
639
640/* --------------------------------------------------------------------------
641 Device Enumeration
642 -------------------------------------------------------------------------- */
643static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
644{
645 acpi_status status;
646 int ret;
647 struct acpi_device *device;
648
649 /*
650 * Fixed hardware devices do not appear in the namespace and do not
651 * have handles, but we fabricate acpi_devices for them, so we have
652 * to deal with them specially.
653 */
654 if (handle == NULL)
655 return acpi_root;
656
657 do {
658 status = acpi_get_parent(handle, &handle);
659 if (status == AE_NULL_ENTRY)
660 return NULL;
661 if (ACPI_FAILURE(status))
662 return acpi_root;
663
664 ret = acpi_bus_get_device(handle, &device);
665 if (ret == 0)
666 return device;
667 } while (1);
668}
669
670acpi_status
671acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
672{
673 acpi_status status;
674 acpi_handle tmp;
675 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
676 union acpi_object *obj;
677
678 status = acpi_get_handle(handle, "_EJD", &tmp);
679 if (ACPI_FAILURE(status))
680 return status;
681
682 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
683 if (ACPI_SUCCESS(status)) {
684 obj = buffer.pointer;
685 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
686 ejd);
687 kfree(buffer.pointer);
688 }
689 return status;
690}
691EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
692
693void acpi_bus_data_handler(acpi_handle handle, void *context)
694{
695
696 /* TBD */
697
698 return;
699}
700
701static int acpi_bus_get_perf_flags(struct acpi_device *device)
702{
703 device->performance.state = ACPI_STATE_UNKNOWN;
704 return 0;
705}
706
707static acpi_status
708acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
709 struct acpi_device_wakeup *wakeup)
710{
711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
713 union acpi_object *element = NULL;
714 acpi_status status;
715 int i = 0;
716
717 if (!wakeup)
718 return AE_BAD_PARAMETER;
719
720 /* _PRW */
721 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
722 if (ACPI_FAILURE(status)) {
723 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
724 return status;
725 }
726
727 package = (union acpi_object *)buffer.pointer;
728
729 if (!package || (package->package.count < 2)) {
730 status = AE_BAD_DATA;
731 goto out;
732 }
733
734 element = &(package->package.elements[0]);
735 if (!element) {
736 status = AE_BAD_DATA;
737 goto out;
738 }
739 if (element->type == ACPI_TYPE_PACKAGE) {
740 if ((element->package.count < 2) ||
741 (element->package.elements[0].type !=
742 ACPI_TYPE_LOCAL_REFERENCE)
743 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
744 status = AE_BAD_DATA;
745 goto out;
746 }
747 wakeup->gpe_device =
748 element->package.elements[0].reference.handle;
749 wakeup->gpe_number =
750 (u32) element->package.elements[1].integer.value;
751 } else if (element->type == ACPI_TYPE_INTEGER) {
752 wakeup->gpe_device = NULL;
753 wakeup->gpe_number = element->integer.value;
754 } else {
755 status = AE_BAD_DATA;
756 goto out;
757 }
758
759 element = &(package->package.elements[1]);
760 if (element->type != ACPI_TYPE_INTEGER) {
761 status = AE_BAD_DATA;
762 goto out;
763 }
764 wakeup->sleep_state = element->integer.value;
765
766 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
767 status = AE_NO_MEMORY;
768 goto out;
769 }
770 wakeup->resources.count = package->package.count - 2;
771 for (i = 0; i < wakeup->resources.count; i++) {
772 element = &(package->package.elements[i + 2]);
773 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
774 status = AE_BAD_DATA;
775 goto out;
776 }
777
778 wakeup->resources.handles[i] = element->reference.handle;
779 }
780
781 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
782
783 out:
784 kfree(buffer.pointer);
785
786 return status;
787}
788
789static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
790{
791 struct acpi_device_id button_device_ids[] = {
792 {"PNP0C0D", 0},
793 {"PNP0C0C", 0},
794 {"PNP0C0E", 0},
795 {"", 0},
796 };
797 acpi_status status;
798 acpi_event_status event_status;
799
800 device->wakeup.flags.notifier_present = 0;
801
802 /* Power button, Lid switch always enable wakeup */
803 if (!acpi_match_device_ids(device, button_device_ids)) {
804 device->wakeup.flags.run_wake = 1;
805 device_set_wakeup_capable(&device->dev, true);
806 return;
807 }
808
809 status = acpi_get_gpe_status(device->wakeup.gpe_device,
810 device->wakeup.gpe_number,
811 &event_status);
812 if (status == AE_OK)
813 device->wakeup.flags.run_wake =
814 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
815}
816
817static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
818{
819 acpi_handle temp;
820 acpi_status status = 0;
821 int psw_error;
822
823 /* Presence of _PRW indicates wake capable */
824 status = acpi_get_handle(device->handle, "_PRW", &temp);
825 if (ACPI_FAILURE(status))
826 return;
827
828 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
829 &device->wakeup);
830 if (ACPI_FAILURE(status)) {
831 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
832 return;
833 }
834
835 device->wakeup.flags.valid = 1;
836 device->wakeup.prepare_count = 0;
837 acpi_bus_set_run_wake_flags(device);
838 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
839 * system for the ACPI device with the _PRW object.
840 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
841 * So it is necessary to call _DSW object first. Only when it is not
842 * present will the _PSW object used.
843 */
844 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
845 if (psw_error)
846 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847 "error in _DSW or _PSW evaluation\n"));
848}
849
850static void acpi_bus_add_power_resource(acpi_handle handle);
851
852static int acpi_bus_get_power_flags(struct acpi_device *device)
853{
854 acpi_status status = 0;
855 acpi_handle handle = NULL;
856 u32 i = 0;
857
858
859 /*
860 * Power Management Flags
861 */
862 status = acpi_get_handle(device->handle, "_PSC", &handle);
863 if (ACPI_SUCCESS(status))
864 device->power.flags.explicit_get = 1;
865 status = acpi_get_handle(device->handle, "_IRC", &handle);
866 if (ACPI_SUCCESS(status))
867 device->power.flags.inrush_current = 1;
868
869 /*
870 * Enumerate supported power management states
871 */
872 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
873 struct acpi_device_power_state *ps = &device->power.states[i];
874 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
875
876 /* Evaluate "_PRx" to se if power resources are referenced */
877 acpi_evaluate_reference(device->handle, object_name, NULL,
878 &ps->resources);
879 if (ps->resources.count) {
880 int j;
881
882 device->power.flags.power_resources = 1;
883 ps->flags.valid = 1;
884 for (j = 0; j < ps->resources.count; j++)
885 acpi_bus_add_power_resource(ps->resources.handles[j]);
886 }
887
888 /* Evaluate "_PSx" to see if we can do explicit sets */
889 object_name[2] = 'S';
890 status = acpi_get_handle(device->handle, object_name, &handle);
891 if (ACPI_SUCCESS(status)) {
892 ps->flags.explicit_set = 1;
893 ps->flags.valid = 1;
894 }
895
896 /* State is valid if we have some power control */
897 if (ps->resources.count || ps->flags.explicit_set)
898 ps->flags.valid = 1;
899
900 ps->power = -1; /* Unknown - driver assigned */
901 ps->latency = -1; /* Unknown - driver assigned */
902 }
903
904 /* Set defaults for D0 and D3 states (always valid) */
905 device->power.states[ACPI_STATE_D0].flags.valid = 1;
906 device->power.states[ACPI_STATE_D0].power = 100;
907 device->power.states[ACPI_STATE_D3].flags.valid = 1;
908 device->power.states[ACPI_STATE_D3].power = 0;
909
910 acpi_bus_init_power(device);
911
912 return 0;
913}
914
915static int acpi_bus_get_flags(struct acpi_device *device)
916{
917 acpi_status status = AE_OK;
918 acpi_handle temp = NULL;
919
920
921 /* Presence of _STA indicates 'dynamic_status' */
922 status = acpi_get_handle(device->handle, "_STA", &temp);
923 if (ACPI_SUCCESS(status))
924 device->flags.dynamic_status = 1;
925
926 /* Presence of _RMV indicates 'removable' */
927 status = acpi_get_handle(device->handle, "_RMV", &temp);
928 if (ACPI_SUCCESS(status))
929 device->flags.removable = 1;
930
931 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
932 status = acpi_get_handle(device->handle, "_EJD", &temp);
933 if (ACPI_SUCCESS(status))
934 device->flags.ejectable = 1;
935 else {
936 status = acpi_get_handle(device->handle, "_EJ0", &temp);
937 if (ACPI_SUCCESS(status))
938 device->flags.ejectable = 1;
939 }
940
941 /* Presence of _LCK indicates 'lockable' */
942 status = acpi_get_handle(device->handle, "_LCK", &temp);
943 if (ACPI_SUCCESS(status))
944 device->flags.lockable = 1;
945
946 /* Power resources cannot be power manageable. */
947 if (device->device_type == ACPI_BUS_TYPE_POWER)
948 return 0;
949
950 /* Presence of _PS0|_PR0 indicates 'power manageable' */
951 status = acpi_get_handle(device->handle, "_PS0", &temp);
952 if (ACPI_FAILURE(status))
953 status = acpi_get_handle(device->handle, "_PR0", &temp);
954 if (ACPI_SUCCESS(status))
955 device->flags.power_manageable = 1;
956
957 /* TBD: Performance management */
958
959 return 0;
960}
961
962static void acpi_device_get_busid(struct acpi_device *device)
963{
964 char bus_id[5] = { '?', 0 };
965 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
966 int i = 0;
967
968 /*
969 * Bus ID
970 * ------
971 * The device's Bus ID is simply the object name.
972 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
973 */
974 if (ACPI_IS_ROOT_DEVICE(device)) {
975 strcpy(device->pnp.bus_id, "ACPI");
976 return;
977 }
978
979 switch (device->device_type) {
980 case ACPI_BUS_TYPE_POWER_BUTTON:
981 strcpy(device->pnp.bus_id, "PWRF");
982 break;
983 case ACPI_BUS_TYPE_SLEEP_BUTTON:
984 strcpy(device->pnp.bus_id, "SLPF");
985 break;
986 default:
987 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
988 /* Clean up trailing underscores (if any) */
989 for (i = 3; i > 1; i--) {
990 if (bus_id[i] == '_')
991 bus_id[i] = '\0';
992 else
993 break;
994 }
995 strcpy(device->pnp.bus_id, bus_id);
996 break;
997 }
998}
999
1000/*
1001 * acpi_bay_match - see if a device is an ejectable driver bay
1002 *
1003 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1004 * then we can safely call it an ejectable drive bay
1005 */
1006static int acpi_bay_match(struct acpi_device *device){
1007 acpi_status status;
1008 acpi_handle handle;
1009 acpi_handle tmp;
1010 acpi_handle phandle;
1011
1012 handle = device->handle;
1013
1014 status = acpi_get_handle(handle, "_EJ0", &tmp);
1015 if (ACPI_FAILURE(status))
1016 return -ENODEV;
1017
1018 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1019 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1020 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1021 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1022 return 0;
1023
1024 if (acpi_get_parent(handle, &phandle))
1025 return -ENODEV;
1026
1027 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1028 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1029 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1030 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1031 return 0;
1032
1033 return -ENODEV;
1034}
1035
1036/*
1037 * acpi_dock_match - see if a device has a _DCK method
1038 */
1039static int acpi_dock_match(struct acpi_device *device)
1040{
1041 acpi_handle tmp;
1042 return acpi_get_handle(device->handle, "_DCK", &tmp);
1043}
1044
1045const char *acpi_device_hid(struct acpi_device *device)
1046{
1047 struct acpi_hardware_id *hid;
1048
1049 if (list_empty(&device->pnp.ids))
1050 return dummy_hid;
1051
1052 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1053 return hid->id;
1054}
1055EXPORT_SYMBOL(acpi_device_hid);
1056
1057static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1058{
1059 struct acpi_hardware_id *id;
1060
1061 id = kmalloc(sizeof(*id), GFP_KERNEL);
1062 if (!id)
1063 return;
1064
1065 id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
1066 if (!id->id) {
1067 kfree(id);
1068 return;
1069 }
1070
1071 strcpy(id->id, dev_id);
1072 list_add_tail(&id->list, &device->pnp.ids);
1073}
1074
1075/*
1076 * Old IBM workstations have a DSDT bug wherein the SMBus object
1077 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1078 * prefix. Work around this.
1079 */
1080static int acpi_ibm_smbus_match(struct acpi_device *device)
1081{
1082 acpi_handle h_dummy;
1083 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1084 int result;
1085
1086 if (!dmi_name_in_vendors("IBM"))
1087 return -ENODEV;
1088
1089 /* Look for SMBS object */
1090 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1091 if (result)
1092 return result;
1093
1094 if (strcmp("SMBS", path.pointer)) {
1095 result = -ENODEV;
1096 goto out;
1097 }
1098
1099 /* Does it have the necessary (but misnamed) methods? */
1100 result = -ENODEV;
1101 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1102 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1103 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1104 result = 0;
1105out:
1106 kfree(path.pointer);
1107 return result;
1108}
1109
1110static void acpi_device_set_id(struct acpi_device *device)
1111{
1112 acpi_status status;
1113 struct acpi_device_info *info;
1114 struct acpica_device_id_list *cid_list;
1115 int i;
1116
1117 switch (device->device_type) {
1118 case ACPI_BUS_TYPE_DEVICE:
1119 if (ACPI_IS_ROOT_DEVICE(device)) {
1120 acpi_add_id(device, ACPI_SYSTEM_HID);
1121 break;
1122 }
1123
1124 status = acpi_get_object_info(device->handle, &info);
1125 if (ACPI_FAILURE(status)) {
1126 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1127 return;
1128 }
1129
1130 if (info->valid & ACPI_VALID_HID)
1131 acpi_add_id(device, info->hardware_id.string);
1132 if (info->valid & ACPI_VALID_CID) {
1133 cid_list = &info->compatible_id_list;
1134 for (i = 0; i < cid_list->count; i++)
1135 acpi_add_id(device, cid_list->ids[i].string);
1136 }
1137 if (info->valid & ACPI_VALID_ADR) {
1138 device->pnp.bus_address = info->address;
1139 device->flags.bus_address = 1;
1140 }
1141
1142 kfree(info);
1143
1144 /*
1145 * Some devices don't reliably have _HIDs & _CIDs, so add
1146 * synthetic HIDs to make sure drivers can find them.
1147 */
1148 if (acpi_is_video_device(device))
1149 acpi_add_id(device, ACPI_VIDEO_HID);
1150 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1151 acpi_add_id(device, ACPI_BAY_HID);
1152 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1153 acpi_add_id(device, ACPI_DOCK_HID);
1154 else if (!acpi_ibm_smbus_match(device))
1155 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1156 else if (!acpi_device_hid(device) &&
1157 ACPI_IS_ROOT_DEVICE(device->parent)) {
1158 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1159 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1160 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1161 }
1162
1163 break;
1164 case ACPI_BUS_TYPE_POWER:
1165 acpi_add_id(device, ACPI_POWER_HID);
1166 break;
1167 case ACPI_BUS_TYPE_PROCESSOR:
1168 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1169 break;
1170 case ACPI_BUS_TYPE_THERMAL:
1171 acpi_add_id(device, ACPI_THERMAL_HID);
1172 break;
1173 case ACPI_BUS_TYPE_POWER_BUTTON:
1174 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1175 break;
1176 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1177 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1178 break;
1179 }
1180}
1181
1182static int acpi_device_set_context(struct acpi_device *device)
1183{
1184 acpi_status status;
1185
1186 /*
1187 * Context
1188 * -------
1189 * Attach this 'struct acpi_device' to the ACPI object. This makes
1190 * resolutions from handle->device very efficient. Fixed hardware
1191 * devices have no handles, so we skip them.
1192 */
1193 if (!device->handle)
1194 return 0;
1195
1196 status = acpi_attach_data(device->handle,
1197 acpi_bus_data_handler, device);
1198 if (ACPI_SUCCESS(status))
1199 return 0;
1200
1201 printk(KERN_ERR PREFIX "Error attaching device data\n");
1202 return -ENODEV;
1203}
1204
1205static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1206{
1207 if (!dev)
1208 return -EINVAL;
1209
1210 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1211 device_release_driver(&dev->dev);
1212
1213 if (!rmdevice)
1214 return 0;
1215
1216 /*
1217 * unbind _ADR-Based Devices when hot removal
1218 */
1219 if (dev->flags.bus_address) {
1220 if ((dev->parent) && (dev->parent->ops.unbind))
1221 dev->parent->ops.unbind(dev);
1222 }
1223 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1224
1225 return 0;
1226}
1227
1228static int acpi_add_single_object(struct acpi_device **child,
1229 acpi_handle handle, int type,
1230 unsigned long long sta,
1231 struct acpi_bus_ops *ops)
1232{
1233 int result;
1234 struct acpi_device *device;
1235 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1236
1237 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1238 if (!device) {
1239 printk(KERN_ERR PREFIX "Memory allocation error\n");
1240 return -ENOMEM;
1241 }
1242
1243 INIT_LIST_HEAD(&device->pnp.ids);
1244 device->device_type = type;
1245 device->handle = handle;
1246 device->parent = acpi_bus_get_parent(handle);
1247 device->bus_ops = *ops; /* workround for not call .start */
1248 STRUCT_TO_INT(device->status) = sta;
1249
1250 acpi_device_get_busid(device);
1251
1252 /*
1253 * Flags
1254 * -----
1255 * Note that we only look for object handles -- cannot evaluate objects
1256 * until we know the device is present and properly initialized.
1257 */
1258 result = acpi_bus_get_flags(device);
1259 if (result)
1260 goto end;
1261
1262 /*
1263 * Initialize Device
1264 * -----------------
1265 * TBD: Synch with Core's enumeration/initialization process.
1266 */
1267 acpi_device_set_id(device);
1268
1269 /*
1270 * Power Management
1271 * ----------------
1272 */
1273 if (device->flags.power_manageable) {
1274 result = acpi_bus_get_power_flags(device);
1275 if (result)
1276 goto end;
1277 }
1278
1279 /*
1280 * Wakeup device management
1281 *-----------------------
1282 */
1283 acpi_bus_get_wakeup_device_flags(device);
1284
1285 /*
1286 * Performance Management
1287 * ----------------------
1288 */
1289 if (device->flags.performance_manageable) {
1290 result = acpi_bus_get_perf_flags(device);
1291 if (result)
1292 goto end;
1293 }
1294
1295 if ((result = acpi_device_set_context(device)))
1296 goto end;
1297
1298 result = acpi_device_register(device);
1299
1300 /*
1301 * Bind _ADR-Based Devices when hot add
1302 */
1303 if (device->flags.bus_address) {
1304 if (device->parent && device->parent->ops.bind)
1305 device->parent->ops.bind(device);
1306 }
1307
1308end:
1309 if (!result) {
1310 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1311 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1312 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1313 (char *) buffer.pointer,
1314 device->parent ? dev_name(&device->parent->dev) :
1315 "(null)"));
1316 kfree(buffer.pointer);
1317 *child = device;
1318 } else
1319 acpi_device_release(&device->dev);
1320
1321 return result;
1322}
1323
1324#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1325 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1326
1327static void acpi_bus_add_power_resource(acpi_handle handle)
1328{
1329 struct acpi_bus_ops ops = {
1330 .acpi_op_add = 1,
1331 .acpi_op_start = 1,
1332 };
1333 struct acpi_device *device = NULL;
1334
1335 acpi_bus_get_device(handle, &device);
1336 if (!device)
1337 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1338 ACPI_STA_DEFAULT, &ops);
1339}
1340
1341static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1342 unsigned long long *sta)
1343{
1344 acpi_status status;
1345 acpi_object_type acpi_type;
1346
1347 status = acpi_get_type(handle, &acpi_type);
1348 if (ACPI_FAILURE(status))
1349 return -ENODEV;
1350
1351 switch (acpi_type) {
1352 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1353 case ACPI_TYPE_DEVICE:
1354 *type = ACPI_BUS_TYPE_DEVICE;
1355 status = acpi_bus_get_status_handle(handle, sta);
1356 if (ACPI_FAILURE(status))
1357 return -ENODEV;
1358 break;
1359 case ACPI_TYPE_PROCESSOR:
1360 *type = ACPI_BUS_TYPE_PROCESSOR;
1361 status = acpi_bus_get_status_handle(handle, sta);
1362 if (ACPI_FAILURE(status))
1363 return -ENODEV;
1364 break;
1365 case ACPI_TYPE_THERMAL:
1366 *type = ACPI_BUS_TYPE_THERMAL;
1367 *sta = ACPI_STA_DEFAULT;
1368 break;
1369 case ACPI_TYPE_POWER:
1370 *type = ACPI_BUS_TYPE_POWER;
1371 *sta = ACPI_STA_DEFAULT;
1372 break;
1373 default:
1374 return -ENODEV;
1375 }
1376
1377 return 0;
1378}
1379
1380static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1381 void *context, void **return_value)
1382{
1383 struct acpi_bus_ops *ops = context;
1384 int type;
1385 unsigned long long sta;
1386 struct acpi_device *device;
1387 acpi_status status;
1388 int result;
1389
1390 result = acpi_bus_type_and_status(handle, &type, &sta);
1391 if (result)
1392 return AE_OK;
1393
1394 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1395 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1396 struct acpi_device_wakeup wakeup;
1397 acpi_handle temp;
1398
1399 status = acpi_get_handle(handle, "_PRW", &temp);
1400 if (ACPI_SUCCESS(status))
1401 acpi_bus_extract_wakeup_device_power_package(handle,
1402 &wakeup);
1403 return AE_CTRL_DEPTH;
1404 }
1405
1406 /*
1407 * We may already have an acpi_device from a previous enumeration. If
1408 * so, we needn't add it again, but we may still have to start it.
1409 */
1410 device = NULL;
1411 acpi_bus_get_device(handle, &device);
1412 if (ops->acpi_op_add && !device)
1413 acpi_add_single_object(&device, handle, type, sta, ops);
1414
1415 if (!device)
1416 return AE_CTRL_DEPTH;
1417
1418 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1419 status = acpi_start_single_object(device);
1420 if (ACPI_FAILURE(status))
1421 return AE_CTRL_DEPTH;
1422 }
1423
1424 if (!*return_value)
1425 *return_value = device;
1426 return AE_OK;
1427}
1428
1429static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1430 struct acpi_device **child)
1431{
1432 acpi_status status;
1433 void *device = NULL;
1434
1435 status = acpi_bus_check_add(handle, 0, ops, &device);
1436 if (ACPI_SUCCESS(status))
1437 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1438 acpi_bus_check_add, NULL, ops, &device);
1439
1440 if (child)
1441 *child = device;
1442
1443 if (device)
1444 return 0;
1445 else
1446 return -ENODEV;
1447}
1448
1449/*
1450 * acpi_bus_add and acpi_bus_start
1451 *
1452 * scan a given ACPI tree and (probably recently hot-plugged)
1453 * create and add or starts found devices.
1454 *
1455 * If no devices were found -ENODEV is returned which does not
1456 * mean that this is a real error, there just have been no suitable
1457 * ACPI objects in the table trunk from which the kernel could create
1458 * a device and add/start an appropriate driver.
1459 */
1460
1461int
1462acpi_bus_add(struct acpi_device **child,
1463 struct acpi_device *parent, acpi_handle handle, int type)
1464{
1465 struct acpi_bus_ops ops;
1466
1467 memset(&ops, 0, sizeof(ops));
1468 ops.acpi_op_add = 1;
1469
1470 return acpi_bus_scan(handle, &ops, child);
1471}
1472EXPORT_SYMBOL(acpi_bus_add);
1473
1474int acpi_bus_start(struct acpi_device *device)
1475{
1476 struct acpi_bus_ops ops;
1477 int result;
1478
1479 if (!device)
1480 return -EINVAL;
1481
1482 memset(&ops, 0, sizeof(ops));
1483 ops.acpi_op_start = 1;
1484
1485 result = acpi_bus_scan(device->handle, &ops, NULL);
1486
1487 acpi_update_all_gpes();
1488
1489 return result;
1490}
1491EXPORT_SYMBOL(acpi_bus_start);
1492
1493int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1494{
1495 acpi_status status;
1496 struct acpi_device *parent, *child;
1497 acpi_handle phandle, chandle;
1498 acpi_object_type type;
1499 u32 level = 1;
1500 int err = 0;
1501
1502 parent = start;
1503 phandle = start->handle;
1504 child = chandle = NULL;
1505
1506 while ((level > 0) && parent && (!err)) {
1507 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1508 chandle, &chandle);
1509
1510 /*
1511 * If this scope is exhausted then move our way back up.
1512 */
1513 if (ACPI_FAILURE(status)) {
1514 level--;
1515 chandle = phandle;
1516 acpi_get_parent(phandle, &phandle);
1517 child = parent;
1518 parent = parent->parent;
1519
1520 if (level == 0)
1521 err = acpi_bus_remove(child, rmdevice);
1522 else
1523 err = acpi_bus_remove(child, 1);
1524
1525 continue;
1526 }
1527
1528 status = acpi_get_type(chandle, &type);
1529 if (ACPI_FAILURE(status)) {
1530 continue;
1531 }
1532 /*
1533 * If there is a device corresponding to chandle then
1534 * parse it (depth-first).
1535 */
1536 if (acpi_bus_get_device(chandle, &child) == 0) {
1537 level++;
1538 phandle = chandle;
1539 chandle = NULL;
1540 parent = child;
1541 }
1542 continue;
1543 }
1544 return err;
1545}
1546EXPORT_SYMBOL_GPL(acpi_bus_trim);
1547
1548static int acpi_bus_scan_fixed(void)
1549{
1550 int result = 0;
1551 struct acpi_device *device = NULL;
1552 struct acpi_bus_ops ops;
1553
1554 memset(&ops, 0, sizeof(ops));
1555 ops.acpi_op_add = 1;
1556 ops.acpi_op_start = 1;
1557
1558 /*
1559 * Enumerate all fixed-feature devices.
1560 */
1561 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1562 result = acpi_add_single_object(&device, NULL,
1563 ACPI_BUS_TYPE_POWER_BUTTON,
1564 ACPI_STA_DEFAULT,
1565 &ops);
1566 }
1567
1568 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1569 result = acpi_add_single_object(&device, NULL,
1570 ACPI_BUS_TYPE_SLEEP_BUTTON,
1571 ACPI_STA_DEFAULT,
1572 &ops);
1573 }
1574
1575 return result;
1576}
1577
1578int __init acpi_scan_init(void)
1579{
1580 int result;
1581 struct acpi_bus_ops ops;
1582
1583 memset(&ops, 0, sizeof(ops));
1584 ops.acpi_op_add = 1;
1585 ops.acpi_op_start = 1;
1586
1587 result = bus_register(&acpi_bus_type);
1588 if (result) {
1589 /* We don't want to quit even if we failed to add suspend/resume */
1590 printk(KERN_ERR PREFIX "Could not register bus type\n");
1591 }
1592
1593 acpi_power_init();
1594
1595 /*
1596 * Enumerate devices in the ACPI namespace.
1597 */
1598 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1599
1600 if (!result)
1601 result = acpi_bus_scan_fixed();
1602
1603 if (result)
1604 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1605 else
1606 acpi_update_all_gpes();
1607
1608 return result;
1609}
1/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <linux/acpi.h>
10#include <linux/signal.h>
11#include <linux/kthread.h>
12#include <linux/dmi.h>
13#include <linux/nls.h>
14
15#include <asm/pgtable.h>
16
17#include "internal.h"
18
19#define _COMPONENT ACPI_BUS_COMPONENT
20ACPI_MODULE_NAME("scan");
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
29#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
30
31/*
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
34 */
35bool acpi_force_hot_remove;
36
37static const char *dummy_hid = "device";
38
39static LIST_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
46struct acpi_device_bus_id{
47 char bus_id[15];
48 unsigned int instance_no;
49 struct list_head node;
50};
51
52void acpi_scan_lock_acquire(void)
53{
54 mutex_lock(&acpi_scan_lock);
55}
56EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57
58void acpi_scan_lock_release(void)
59{
60 mutex_unlock(&acpi_scan_lock);
61}
62EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63
64void acpi_lock_hp_context(void)
65{
66 mutex_lock(&acpi_hp_context_lock);
67}
68
69void acpi_unlock_hp_context(void)
70{
71 mutex_unlock(&acpi_hp_context_lock);
72}
73
74void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
78{
79 acpi_lock_hp_context();
80 acpi_set_hp_context(adev, hp, notify, uevent, NULL);
81 acpi_unlock_hp_context();
82}
83EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
84
85int acpi_scan_add_handler(struct acpi_scan_handler *handler)
86{
87 if (!handler || !handler->attach)
88 return -EINVAL;
89
90 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
91 return 0;
92}
93
94int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
95 const char *hotplug_profile_name)
96{
97 int error;
98
99 error = acpi_scan_add_handler(handler);
100 if (error)
101 return error;
102
103 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
104 return 0;
105}
106
107/*
108 * Creates hid/cid(s) string needed for modalias and uevent
109 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
110 * char *modalias: "acpi:IBM0001:ACPI0001"
111 * Return: 0: no _HID and no _CID
112 * -EINVAL: output error
113 * -ENOMEM: output is truncated
114*/
115static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
116 int size)
117{
118 int len;
119 int count;
120 struct acpi_hardware_id *id;
121
122 if (list_empty(&acpi_dev->pnp.ids))
123 return 0;
124
125 len = snprintf(modalias, size, "acpi:");
126 size -= len;
127
128 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
129 count = snprintf(&modalias[len], size, "%s:", id->id);
130 if (count < 0)
131 return EINVAL;
132 if (count >= size)
133 return -ENOMEM;
134 len += count;
135 size -= count;
136 }
137
138 modalias[len] = '\0';
139 return len;
140}
141
142/*
143 * Creates uevent modalias field for ACPI enumerated devices.
144 * Because the other buses does not support ACPI HIDs & CIDs.
145 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
146 * "acpi:IBM0001:ACPI0001"
147 */
148int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
149{
150 struct acpi_device *acpi_dev;
151 int len;
152
153 acpi_dev = ACPI_COMPANION(dev);
154 if (!acpi_dev)
155 return -ENODEV;
156
157 /* Fall back to bus specific way of modalias exporting */
158 if (list_empty(&acpi_dev->pnp.ids))
159 return -ENODEV;
160
161 if (add_uevent_var(env, "MODALIAS="))
162 return -ENOMEM;
163 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
164 sizeof(env->buf) - env->buflen);
165 if (len <= 0)
166 return len;
167 env->buflen += len;
168 return 0;
169}
170EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
171
172/*
173 * Creates modalias sysfs attribute for ACPI enumerated devices.
174 * Because the other buses does not support ACPI HIDs & CIDs.
175 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
176 * "acpi:IBM0001:ACPI0001"
177 */
178int acpi_device_modalias(struct device *dev, char *buf, int size)
179{
180 struct acpi_device *acpi_dev;
181 int len;
182
183 acpi_dev = ACPI_COMPANION(dev);
184 if (!acpi_dev)
185 return -ENODEV;
186
187 /* Fall back to bus specific way of modalias exporting */
188 if (list_empty(&acpi_dev->pnp.ids))
189 return -ENODEV;
190
191 len = create_modalias(acpi_dev, buf, size -1);
192 if (len <= 0)
193 return len;
194 buf[len++] = '\n';
195 return len;
196}
197EXPORT_SYMBOL_GPL(acpi_device_modalias);
198
199static ssize_t
200acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
201 struct acpi_device *acpi_dev = to_acpi_device(dev);
202 int len;
203
204 len = create_modalias(acpi_dev, buf, 1024);
205 if (len <= 0)
206 return len;
207 buf[len++] = '\n';
208 return len;
209}
210static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
211
212bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
213{
214 struct acpi_device_physical_node *pn;
215 bool offline = true;
216
217 mutex_lock(&adev->physical_node_lock);
218
219 list_for_each_entry(pn, &adev->physical_node_list, node)
220 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
221 if (uevent)
222 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
223
224 offline = false;
225 break;
226 }
227
228 mutex_unlock(&adev->physical_node_lock);
229 return offline;
230}
231
232static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
233 void **ret_p)
234{
235 struct acpi_device *device = NULL;
236 struct acpi_device_physical_node *pn;
237 bool second_pass = (bool)data;
238 acpi_status status = AE_OK;
239
240 if (acpi_bus_get_device(handle, &device))
241 return AE_OK;
242
243 if (device->handler && !device->handler->hotplug.enabled) {
244 *ret_p = &device->dev;
245 return AE_SUPPORT;
246 }
247
248 mutex_lock(&device->physical_node_lock);
249
250 list_for_each_entry(pn, &device->physical_node_list, node) {
251 int ret;
252
253 if (second_pass) {
254 /* Skip devices offlined by the first pass. */
255 if (pn->put_online)
256 continue;
257 } else {
258 pn->put_online = false;
259 }
260 ret = device_offline(pn->dev);
261 if (acpi_force_hot_remove)
262 continue;
263
264 if (ret >= 0) {
265 pn->put_online = !ret;
266 } else {
267 *ret_p = pn->dev;
268 if (second_pass) {
269 status = AE_ERROR;
270 break;
271 }
272 }
273 }
274
275 mutex_unlock(&device->physical_node_lock);
276
277 return status;
278}
279
280static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
281 void **ret_p)
282{
283 struct acpi_device *device = NULL;
284 struct acpi_device_physical_node *pn;
285
286 if (acpi_bus_get_device(handle, &device))
287 return AE_OK;
288
289 mutex_lock(&device->physical_node_lock);
290
291 list_for_each_entry(pn, &device->physical_node_list, node)
292 if (pn->put_online) {
293 device_online(pn->dev);
294 pn->put_online = false;
295 }
296
297 mutex_unlock(&device->physical_node_lock);
298
299 return AE_OK;
300}
301
302static int acpi_scan_try_to_offline(struct acpi_device *device)
303{
304 acpi_handle handle = device->handle;
305 struct device *errdev = NULL;
306 acpi_status status;
307
308 /*
309 * Carry out two passes here and ignore errors in the first pass,
310 * because if the devices in question are memory blocks and
311 * CONFIG_MEMCG is set, one of the blocks may hold data structures
312 * that the other blocks depend on, but it is not known in advance which
313 * block holds them.
314 *
315 * If the first pass is successful, the second one isn't needed, though.
316 */
317 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
318 NULL, acpi_bus_offline, (void *)false,
319 (void **)&errdev);
320 if (status == AE_SUPPORT) {
321 dev_warn(errdev, "Offline disabled.\n");
322 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
323 acpi_bus_online, NULL, NULL, NULL);
324 return -EPERM;
325 }
326 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
327 if (errdev) {
328 errdev = NULL;
329 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
330 NULL, acpi_bus_offline, (void *)true,
331 (void **)&errdev);
332 if (!errdev || acpi_force_hot_remove)
333 acpi_bus_offline(handle, 0, (void *)true,
334 (void **)&errdev);
335
336 if (errdev && !acpi_force_hot_remove) {
337 dev_warn(errdev, "Offline failed.\n");
338 acpi_bus_online(handle, 0, NULL, NULL);
339 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
340 ACPI_UINT32_MAX, acpi_bus_online,
341 NULL, NULL, NULL);
342 return -EBUSY;
343 }
344 }
345 return 0;
346}
347
348static int acpi_scan_hot_remove(struct acpi_device *device)
349{
350 acpi_handle handle = device->handle;
351 unsigned long long sta;
352 acpi_status status;
353
354 if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
355 if (!acpi_scan_is_offline(device, true))
356 return -EBUSY;
357 } else {
358 int error = acpi_scan_try_to_offline(device);
359 if (error)
360 return error;
361 }
362
363 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
364 "Hot-removing device %s...\n", dev_name(&device->dev)));
365
366 acpi_bus_trim(device);
367
368 acpi_evaluate_lck(handle, 0);
369 /*
370 * TBD: _EJD support.
371 */
372 status = acpi_evaluate_ej0(handle);
373 if (status == AE_NOT_FOUND)
374 return -ENODEV;
375 else if (ACPI_FAILURE(status))
376 return -EIO;
377
378 /*
379 * Verify if eject was indeed successful. If not, log an error
380 * message. No need to call _OST since _EJ0 call was made OK.
381 */
382 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
383 if (ACPI_FAILURE(status)) {
384 acpi_handle_warn(handle,
385 "Status check after eject failed (0x%x)\n", status);
386 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
387 acpi_handle_warn(handle,
388 "Eject incomplete - status 0x%llx\n", sta);
389 }
390
391 return 0;
392}
393
394static int acpi_scan_device_not_present(struct acpi_device *adev)
395{
396 if (!acpi_device_enumerated(adev)) {
397 dev_warn(&adev->dev, "Still not present\n");
398 return -EALREADY;
399 }
400 acpi_bus_trim(adev);
401 return 0;
402}
403
404static int acpi_scan_device_check(struct acpi_device *adev)
405{
406 int error;
407
408 acpi_bus_get_status(adev);
409 if (adev->status.present || adev->status.functional) {
410 /*
411 * This function is only called for device objects for which
412 * matching scan handlers exist. The only situation in which
413 * the scan handler is not attached to this device object yet
414 * is when the device has just appeared (either it wasn't
415 * present at all before or it was removed and then added
416 * again).
417 */
418 if (adev->handler) {
419 dev_warn(&adev->dev, "Already enumerated\n");
420 return -EALREADY;
421 }
422 error = acpi_bus_scan(adev->handle);
423 if (error) {
424 dev_warn(&adev->dev, "Namespace scan failure\n");
425 return error;
426 }
427 if (!adev->handler) {
428 dev_warn(&adev->dev, "Enumeration failure\n");
429 error = -ENODEV;
430 }
431 } else {
432 error = acpi_scan_device_not_present(adev);
433 }
434 return error;
435}
436
437static int acpi_scan_bus_check(struct acpi_device *adev)
438{
439 struct acpi_scan_handler *handler = adev->handler;
440 struct acpi_device *child;
441 int error;
442
443 acpi_bus_get_status(adev);
444 if (!(adev->status.present || adev->status.functional)) {
445 acpi_scan_device_not_present(adev);
446 return 0;
447 }
448 if (handler && handler->hotplug.scan_dependent)
449 return handler->hotplug.scan_dependent(adev);
450
451 error = acpi_bus_scan(adev->handle);
452 if (error) {
453 dev_warn(&adev->dev, "Namespace scan failure\n");
454 return error;
455 }
456 list_for_each_entry(child, &adev->children, node) {
457 error = acpi_scan_bus_check(child);
458 if (error)
459 return error;
460 }
461 return 0;
462}
463
464static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
465{
466 switch (type) {
467 case ACPI_NOTIFY_BUS_CHECK:
468 return acpi_scan_bus_check(adev);
469 case ACPI_NOTIFY_DEVICE_CHECK:
470 return acpi_scan_device_check(adev);
471 case ACPI_NOTIFY_EJECT_REQUEST:
472 case ACPI_OST_EC_OSPM_EJECT:
473 if (adev->handler && !adev->handler->hotplug.enabled) {
474 dev_info(&adev->dev, "Eject disabled\n");
475 return -EPERM;
476 }
477 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
478 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
479 return acpi_scan_hot_remove(adev);
480 }
481 return -EINVAL;
482}
483
484void acpi_device_hotplug(struct acpi_device *adev, u32 src)
485{
486 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
487 int error = -ENODEV;
488
489 lock_device_hotplug();
490 mutex_lock(&acpi_scan_lock);
491
492 /*
493 * The device object's ACPI handle cannot become invalid as long as we
494 * are holding acpi_scan_lock, but it might have become invalid before
495 * that lock was acquired.
496 */
497 if (adev->handle == INVALID_ACPI_HANDLE)
498 goto err_out;
499
500 if (adev->flags.is_dock_station) {
501 error = dock_notify(adev, src);
502 } else if (adev->flags.hotplug_notify) {
503 error = acpi_generic_hotplug_event(adev, src);
504 if (error == -EPERM) {
505 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
506 goto err_out;
507 }
508 } else {
509 int (*notify)(struct acpi_device *, u32);
510
511 acpi_lock_hp_context();
512 notify = adev->hp ? adev->hp->notify : NULL;
513 acpi_unlock_hp_context();
514 /*
515 * There may be additional notify handlers for device objects
516 * without the .event() callback, so ignore them here.
517 */
518 if (notify)
519 error = notify(adev, src);
520 else
521 goto out;
522 }
523 if (!error)
524 ost_code = ACPI_OST_SC_SUCCESS;
525
526 err_out:
527 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
528
529 out:
530 acpi_bus_put_acpi_device(adev);
531 mutex_unlock(&acpi_scan_lock);
532 unlock_device_hotplug();
533}
534
535static ssize_t real_power_state_show(struct device *dev,
536 struct device_attribute *attr, char *buf)
537{
538 struct acpi_device *adev = to_acpi_device(dev);
539 int state;
540 int ret;
541
542 ret = acpi_device_get_power(adev, &state);
543 if (ret)
544 return ret;
545
546 return sprintf(buf, "%s\n", acpi_power_state_string(state));
547}
548
549static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
550
551static ssize_t power_state_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
553{
554 struct acpi_device *adev = to_acpi_device(dev);
555
556 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
557}
558
559static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
560
561static ssize_t
562acpi_eject_store(struct device *d, struct device_attribute *attr,
563 const char *buf, size_t count)
564{
565 struct acpi_device *acpi_device = to_acpi_device(d);
566 acpi_object_type not_used;
567 acpi_status status;
568
569 if (!count || buf[0] != '1')
570 return -EINVAL;
571
572 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
573 && !acpi_device->driver)
574 return -ENODEV;
575
576 status = acpi_get_type(acpi_device->handle, ¬_used);
577 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
578 return -ENODEV;
579
580 get_device(&acpi_device->dev);
581 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
582 if (ACPI_SUCCESS(status))
583 return count;
584
585 put_device(&acpi_device->dev);
586 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
587 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
588 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
589}
590
591static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
592
593static ssize_t
594acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
595 struct acpi_device *acpi_dev = to_acpi_device(dev);
596
597 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
598}
599static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
600
601static ssize_t acpi_device_uid_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
603{
604 struct acpi_device *acpi_dev = to_acpi_device(dev);
605
606 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
607}
608static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
609
610static ssize_t acpi_device_adr_show(struct device *dev,
611 struct device_attribute *attr, char *buf)
612{
613 struct acpi_device *acpi_dev = to_acpi_device(dev);
614
615 return sprintf(buf, "0x%08x\n",
616 (unsigned int)(acpi_dev->pnp.bus_address));
617}
618static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
619
620static ssize_t
621acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
622 struct acpi_device *acpi_dev = to_acpi_device(dev);
623 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
624 int result;
625
626 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
627 if (result)
628 goto end;
629
630 result = sprintf(buf, "%s\n", (char*)path.pointer);
631 kfree(path.pointer);
632end:
633 return result;
634}
635static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
636
637/* sysfs file that shows description text from the ACPI _STR method */
638static ssize_t description_show(struct device *dev,
639 struct device_attribute *attr,
640 char *buf) {
641 struct acpi_device *acpi_dev = to_acpi_device(dev);
642 int result;
643
644 if (acpi_dev->pnp.str_obj == NULL)
645 return 0;
646
647 /*
648 * The _STR object contains a Unicode identifier for a device.
649 * We need to convert to utf-8 so it can be displayed.
650 */
651 result = utf16s_to_utf8s(
652 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
653 acpi_dev->pnp.str_obj->buffer.length,
654 UTF16_LITTLE_ENDIAN, buf,
655 PAGE_SIZE);
656
657 buf[result++] = '\n';
658
659 return result;
660}
661static DEVICE_ATTR(description, 0444, description_show, NULL);
662
663static ssize_t
664acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
665 char *buf) {
666 struct acpi_device *acpi_dev = to_acpi_device(dev);
667
668 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
669}
670static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
671
672static ssize_t status_show(struct device *dev, struct device_attribute *attr,
673 char *buf) {
674 struct acpi_device *acpi_dev = to_acpi_device(dev);
675 acpi_status status;
676 unsigned long long sta;
677
678 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
679 if (ACPI_FAILURE(status))
680 return -ENODEV;
681
682 return sprintf(buf, "%llu\n", sta);
683}
684static DEVICE_ATTR_RO(status);
685
686static int acpi_device_setup_files(struct acpi_device *dev)
687{
688 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
689 acpi_status status;
690 unsigned long long sun;
691 int result = 0;
692
693 /*
694 * Devices gotten from FADT don't have a "path" attribute
695 */
696 if (dev->handle) {
697 result = device_create_file(&dev->dev, &dev_attr_path);
698 if (result)
699 goto end;
700 }
701
702 if (!list_empty(&dev->pnp.ids)) {
703 result = device_create_file(&dev->dev, &dev_attr_hid);
704 if (result)
705 goto end;
706
707 result = device_create_file(&dev->dev, &dev_attr_modalias);
708 if (result)
709 goto end;
710 }
711
712 /*
713 * If device has _STR, 'description' file is created
714 */
715 if (acpi_has_method(dev->handle, "_STR")) {
716 status = acpi_evaluate_object(dev->handle, "_STR",
717 NULL, &buffer);
718 if (ACPI_FAILURE(status))
719 buffer.pointer = NULL;
720 dev->pnp.str_obj = buffer.pointer;
721 result = device_create_file(&dev->dev, &dev_attr_description);
722 if (result)
723 goto end;
724 }
725
726 if (dev->pnp.type.bus_address)
727 result = device_create_file(&dev->dev, &dev_attr_adr);
728 if (dev->pnp.unique_id)
729 result = device_create_file(&dev->dev, &dev_attr_uid);
730
731 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
732 if (ACPI_SUCCESS(status)) {
733 dev->pnp.sun = (unsigned long)sun;
734 result = device_create_file(&dev->dev, &dev_attr_sun);
735 if (result)
736 goto end;
737 } else {
738 dev->pnp.sun = (unsigned long)-1;
739 }
740
741 if (acpi_has_method(dev->handle, "_STA")) {
742 result = device_create_file(&dev->dev, &dev_attr_status);
743 if (result)
744 goto end;
745 }
746
747 /*
748 * If device has _EJ0, 'eject' file is created that is used to trigger
749 * hot-removal function from userland.
750 */
751 if (acpi_has_method(dev->handle, "_EJ0")) {
752 result = device_create_file(&dev->dev, &dev_attr_eject);
753 if (result)
754 return result;
755 }
756
757 if (dev->flags.power_manageable) {
758 result = device_create_file(&dev->dev, &dev_attr_power_state);
759 if (result)
760 return result;
761
762 if (dev->power.flags.power_resources)
763 result = device_create_file(&dev->dev,
764 &dev_attr_real_power_state);
765 }
766
767end:
768 return result;
769}
770
771static void acpi_device_remove_files(struct acpi_device *dev)
772{
773 if (dev->flags.power_manageable) {
774 device_remove_file(&dev->dev, &dev_attr_power_state);
775 if (dev->power.flags.power_resources)
776 device_remove_file(&dev->dev,
777 &dev_attr_real_power_state);
778 }
779
780 /*
781 * If device has _STR, remove 'description' file
782 */
783 if (acpi_has_method(dev->handle, "_STR")) {
784 kfree(dev->pnp.str_obj);
785 device_remove_file(&dev->dev, &dev_attr_description);
786 }
787 /*
788 * If device has _EJ0, remove 'eject' file.
789 */
790 if (acpi_has_method(dev->handle, "_EJ0"))
791 device_remove_file(&dev->dev, &dev_attr_eject);
792
793 if (acpi_has_method(dev->handle, "_SUN"))
794 device_remove_file(&dev->dev, &dev_attr_sun);
795
796 if (dev->pnp.unique_id)
797 device_remove_file(&dev->dev, &dev_attr_uid);
798 if (dev->pnp.type.bus_address)
799 device_remove_file(&dev->dev, &dev_attr_adr);
800 device_remove_file(&dev->dev, &dev_attr_modalias);
801 device_remove_file(&dev->dev, &dev_attr_hid);
802 if (acpi_has_method(dev->handle, "_STA"))
803 device_remove_file(&dev->dev, &dev_attr_status);
804 if (dev->handle)
805 device_remove_file(&dev->dev, &dev_attr_path);
806}
807/* --------------------------------------------------------------------------
808 ACPI Bus operations
809 -------------------------------------------------------------------------- */
810
811static const struct acpi_device_id *__acpi_match_device(
812 struct acpi_device *device, const struct acpi_device_id *ids)
813{
814 const struct acpi_device_id *id;
815 struct acpi_hardware_id *hwid;
816
817 /*
818 * If the device is not present, it is unnecessary to load device
819 * driver for it.
820 */
821 if (!device->status.present)
822 return NULL;
823
824 for (id = ids; id->id[0]; id++)
825 list_for_each_entry(hwid, &device->pnp.ids, list)
826 if (!strcmp((char *) id->id, hwid->id))
827 return id;
828
829 return NULL;
830}
831
832/**
833 * acpi_match_device - Match a struct device against a given list of ACPI IDs
834 * @ids: Array of struct acpi_device_id object to match against.
835 * @dev: The device structure to match.
836 *
837 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
838 * object for that handle and use that object to match against a given list of
839 * device IDs.
840 *
841 * Return a pointer to the first matching ID on success or %NULL on failure.
842 */
843const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
844 const struct device *dev)
845{
846 struct acpi_device *adev;
847 acpi_handle handle = ACPI_HANDLE(dev);
848
849 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
850 return NULL;
851
852 return __acpi_match_device(adev, ids);
853}
854EXPORT_SYMBOL_GPL(acpi_match_device);
855
856int acpi_match_device_ids(struct acpi_device *device,
857 const struct acpi_device_id *ids)
858{
859 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
860}
861EXPORT_SYMBOL(acpi_match_device_ids);
862
863static void acpi_free_power_resources_lists(struct acpi_device *device)
864{
865 int i;
866
867 if (device->wakeup.flags.valid)
868 acpi_power_resources_list_free(&device->wakeup.resources);
869
870 if (!device->flags.power_manageable)
871 return;
872
873 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
874 struct acpi_device_power_state *ps = &device->power.states[i];
875 acpi_power_resources_list_free(&ps->resources);
876 }
877}
878
879static void acpi_device_release(struct device *dev)
880{
881 struct acpi_device *acpi_dev = to_acpi_device(dev);
882
883 acpi_free_pnp_ids(&acpi_dev->pnp);
884 acpi_free_power_resources_lists(acpi_dev);
885 kfree(acpi_dev);
886}
887
888static int acpi_bus_match(struct device *dev, struct device_driver *drv)
889{
890 struct acpi_device *acpi_dev = to_acpi_device(dev);
891 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
892
893 return acpi_dev->flags.match_driver
894 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
895}
896
897static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
898{
899 struct acpi_device *acpi_dev = to_acpi_device(dev);
900 int len;
901
902 if (list_empty(&acpi_dev->pnp.ids))
903 return 0;
904
905 if (add_uevent_var(env, "MODALIAS="))
906 return -ENOMEM;
907 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
908 sizeof(env->buf) - env->buflen);
909 if (len <= 0)
910 return len;
911 env->buflen += len;
912 return 0;
913}
914
915static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
916{
917 struct acpi_device *device = data;
918
919 device->driver->ops.notify(device, event);
920}
921
922static acpi_status acpi_device_notify_fixed(void *data)
923{
924 struct acpi_device *device = data;
925
926 /* Fixed hardware devices have no handles */
927 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
928 return AE_OK;
929}
930
931static int acpi_device_install_notify_handler(struct acpi_device *device)
932{
933 acpi_status status;
934
935 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
936 status =
937 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
938 acpi_device_notify_fixed,
939 device);
940 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
941 status =
942 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
943 acpi_device_notify_fixed,
944 device);
945 else
946 status = acpi_install_notify_handler(device->handle,
947 ACPI_DEVICE_NOTIFY,
948 acpi_device_notify,
949 device);
950
951 if (ACPI_FAILURE(status))
952 return -EINVAL;
953 return 0;
954}
955
956static void acpi_device_remove_notify_handler(struct acpi_device *device)
957{
958 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
959 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
960 acpi_device_notify_fixed);
961 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
962 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
963 acpi_device_notify_fixed);
964 else
965 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
966 acpi_device_notify);
967}
968
969static int acpi_device_probe(struct device *dev)
970{
971 struct acpi_device *acpi_dev = to_acpi_device(dev);
972 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
973 int ret;
974
975 if (acpi_dev->handler)
976 return -EINVAL;
977
978 if (!acpi_drv->ops.add)
979 return -ENOSYS;
980
981 ret = acpi_drv->ops.add(acpi_dev);
982 if (ret)
983 return ret;
984
985 acpi_dev->driver = acpi_drv;
986 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
987 "Driver [%s] successfully bound to device [%s]\n",
988 acpi_drv->name, acpi_dev->pnp.bus_id));
989
990 if (acpi_drv->ops.notify) {
991 ret = acpi_device_install_notify_handler(acpi_dev);
992 if (ret) {
993 if (acpi_drv->ops.remove)
994 acpi_drv->ops.remove(acpi_dev);
995
996 acpi_dev->driver = NULL;
997 acpi_dev->driver_data = NULL;
998 return ret;
999 }
1000 }
1001
1002 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1003 acpi_drv->name, acpi_dev->pnp.bus_id));
1004 get_device(dev);
1005 return 0;
1006}
1007
1008static int acpi_device_remove(struct device * dev)
1009{
1010 struct acpi_device *acpi_dev = to_acpi_device(dev);
1011 struct acpi_driver *acpi_drv = acpi_dev->driver;
1012
1013 if (acpi_drv) {
1014 if (acpi_drv->ops.notify)
1015 acpi_device_remove_notify_handler(acpi_dev);
1016 if (acpi_drv->ops.remove)
1017 acpi_drv->ops.remove(acpi_dev);
1018 }
1019 acpi_dev->driver = NULL;
1020 acpi_dev->driver_data = NULL;
1021
1022 put_device(dev);
1023 return 0;
1024}
1025
1026struct bus_type acpi_bus_type = {
1027 .name = "acpi",
1028 .match = acpi_bus_match,
1029 .probe = acpi_device_probe,
1030 .remove = acpi_device_remove,
1031 .uevent = acpi_device_uevent,
1032};
1033
1034static void acpi_device_del(struct acpi_device *device)
1035{
1036 mutex_lock(&acpi_device_lock);
1037 if (device->parent)
1038 list_del(&device->node);
1039
1040 list_del(&device->wakeup_list);
1041 mutex_unlock(&acpi_device_lock);
1042
1043 acpi_power_add_remove_device(device, false);
1044 acpi_device_remove_files(device);
1045 if (device->remove)
1046 device->remove(device);
1047
1048 device_del(&device->dev);
1049}
1050
1051static LIST_HEAD(acpi_device_del_list);
1052static DEFINE_MUTEX(acpi_device_del_lock);
1053
1054static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1055{
1056 for (;;) {
1057 struct acpi_device *adev;
1058
1059 mutex_lock(&acpi_device_del_lock);
1060
1061 if (list_empty(&acpi_device_del_list)) {
1062 mutex_unlock(&acpi_device_del_lock);
1063 break;
1064 }
1065 adev = list_first_entry(&acpi_device_del_list,
1066 struct acpi_device, del_list);
1067 list_del(&adev->del_list);
1068
1069 mutex_unlock(&acpi_device_del_lock);
1070
1071 acpi_device_del(adev);
1072 /*
1073 * Drop references to all power resources that might have been
1074 * used by the device.
1075 */
1076 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1077 put_device(&adev->dev);
1078 }
1079}
1080
1081/**
1082 * acpi_scan_drop_device - Drop an ACPI device object.
1083 * @handle: Handle of an ACPI namespace node, not used.
1084 * @context: Address of the ACPI device object to drop.
1085 *
1086 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1087 * namespace node the device object pointed to by @context is attached to.
1088 *
1089 * The unregistration is carried out asynchronously to avoid running
1090 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1091 * ensure the correct ordering (the device objects must be unregistered in the
1092 * same order in which the corresponding namespace nodes are deleted).
1093 */
1094static void acpi_scan_drop_device(acpi_handle handle, void *context)
1095{
1096 static DECLARE_WORK(work, acpi_device_del_work_fn);
1097 struct acpi_device *adev = context;
1098
1099 mutex_lock(&acpi_device_del_lock);
1100
1101 /*
1102 * Use the ACPI hotplug workqueue which is ordered, so this work item
1103 * won't run after any hotplug work items submitted subsequently. That
1104 * prevents attempts to register device objects identical to those being
1105 * deleted from happening concurrently (such attempts result from
1106 * hotplug events handled via the ACPI hotplug workqueue). It also will
1107 * run after all of the work items submitted previosuly, which helps
1108 * those work items to ensure that they are not accessing stale device
1109 * objects.
1110 */
1111 if (list_empty(&acpi_device_del_list))
1112 acpi_queue_hotplug_work(&work);
1113
1114 list_add_tail(&adev->del_list, &acpi_device_del_list);
1115 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1116 adev->handle = INVALID_ACPI_HANDLE;
1117
1118 mutex_unlock(&acpi_device_del_lock);
1119}
1120
1121static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1122 void (*callback)(void *))
1123{
1124 acpi_status status;
1125
1126 if (!device)
1127 return -EINVAL;
1128
1129 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1130 (void **)device, callback);
1131 if (ACPI_FAILURE(status) || !*device) {
1132 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1133 handle));
1134 return -ENODEV;
1135 }
1136 return 0;
1137}
1138
1139int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1140{
1141 return acpi_get_device_data(handle, device, NULL);
1142}
1143EXPORT_SYMBOL(acpi_bus_get_device);
1144
1145static void get_acpi_device(void *dev)
1146{
1147 if (dev)
1148 get_device(&((struct acpi_device *)dev)->dev);
1149}
1150
1151struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1152{
1153 struct acpi_device *adev = NULL;
1154
1155 acpi_get_device_data(handle, &adev, get_acpi_device);
1156 return adev;
1157}
1158
1159void acpi_bus_put_acpi_device(struct acpi_device *adev)
1160{
1161 put_device(&adev->dev);
1162}
1163
1164int acpi_device_add(struct acpi_device *device,
1165 void (*release)(struct device *))
1166{
1167 int result;
1168 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1169 int found = 0;
1170
1171 if (device->handle) {
1172 acpi_status status;
1173
1174 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1175 device);
1176 if (ACPI_FAILURE(status)) {
1177 acpi_handle_err(device->handle,
1178 "Unable to attach device data\n");
1179 return -ENODEV;
1180 }
1181 }
1182
1183 /*
1184 * Linkage
1185 * -------
1186 * Link this device to its parent and siblings.
1187 */
1188 INIT_LIST_HEAD(&device->children);
1189 INIT_LIST_HEAD(&device->node);
1190 INIT_LIST_HEAD(&device->wakeup_list);
1191 INIT_LIST_HEAD(&device->physical_node_list);
1192 INIT_LIST_HEAD(&device->del_list);
1193 mutex_init(&device->physical_node_lock);
1194
1195 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1196 if (!new_bus_id) {
1197 pr_err(PREFIX "Memory allocation error\n");
1198 result = -ENOMEM;
1199 goto err_detach;
1200 }
1201
1202 mutex_lock(&acpi_device_lock);
1203 /*
1204 * Find suitable bus_id and instance number in acpi_bus_id_list
1205 * If failed, create one and link it into acpi_bus_id_list
1206 */
1207 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1208 if (!strcmp(acpi_device_bus_id->bus_id,
1209 acpi_device_hid(device))) {
1210 acpi_device_bus_id->instance_no++;
1211 found = 1;
1212 kfree(new_bus_id);
1213 break;
1214 }
1215 }
1216 if (!found) {
1217 acpi_device_bus_id = new_bus_id;
1218 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1219 acpi_device_bus_id->instance_no = 0;
1220 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1221 }
1222 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1223
1224 if (device->parent)
1225 list_add_tail(&device->node, &device->parent->children);
1226
1227 if (device->wakeup.flags.valid)
1228 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1229 mutex_unlock(&acpi_device_lock);
1230
1231 if (device->parent)
1232 device->dev.parent = &device->parent->dev;
1233 device->dev.bus = &acpi_bus_type;
1234 device->dev.release = release;
1235 result = device_add(&device->dev);
1236 if (result) {
1237 dev_err(&device->dev, "Error registering device\n");
1238 goto err;
1239 }
1240
1241 result = acpi_device_setup_files(device);
1242 if (result)
1243 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1244 dev_name(&device->dev));
1245
1246 return 0;
1247
1248 err:
1249 mutex_lock(&acpi_device_lock);
1250 if (device->parent)
1251 list_del(&device->node);
1252 list_del(&device->wakeup_list);
1253 mutex_unlock(&acpi_device_lock);
1254
1255 err_detach:
1256 acpi_detach_data(device->handle, acpi_scan_drop_device);
1257 return result;
1258}
1259
1260/* --------------------------------------------------------------------------
1261 Driver Management
1262 -------------------------------------------------------------------------- */
1263/**
1264 * acpi_bus_register_driver - register a driver with the ACPI bus
1265 * @driver: driver being registered
1266 *
1267 * Registers a driver with the ACPI bus. Searches the namespace for all
1268 * devices that match the driver's criteria and binds. Returns zero for
1269 * success or a negative error status for failure.
1270 */
1271int acpi_bus_register_driver(struct acpi_driver *driver)
1272{
1273 int ret;
1274
1275 if (acpi_disabled)
1276 return -ENODEV;
1277 driver->drv.name = driver->name;
1278 driver->drv.bus = &acpi_bus_type;
1279 driver->drv.owner = driver->owner;
1280
1281 ret = driver_register(&driver->drv);
1282 return ret;
1283}
1284
1285EXPORT_SYMBOL(acpi_bus_register_driver);
1286
1287/**
1288 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1289 * @driver: driver to unregister
1290 *
1291 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1292 * devices that match the driver's criteria and unbinds.
1293 */
1294void acpi_bus_unregister_driver(struct acpi_driver *driver)
1295{
1296 driver_unregister(&driver->drv);
1297}
1298
1299EXPORT_SYMBOL(acpi_bus_unregister_driver);
1300
1301/* --------------------------------------------------------------------------
1302 Device Enumeration
1303 -------------------------------------------------------------------------- */
1304static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1305{
1306 struct acpi_device *device = NULL;
1307 acpi_status status;
1308
1309 /*
1310 * Fixed hardware devices do not appear in the namespace and do not
1311 * have handles, but we fabricate acpi_devices for them, so we have
1312 * to deal with them specially.
1313 */
1314 if (!handle)
1315 return acpi_root;
1316
1317 do {
1318 status = acpi_get_parent(handle, &handle);
1319 if (ACPI_FAILURE(status))
1320 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1321 } while (acpi_bus_get_device(handle, &device));
1322 return device;
1323}
1324
1325acpi_status
1326acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1327{
1328 acpi_status status;
1329 acpi_handle tmp;
1330 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1331 union acpi_object *obj;
1332
1333 status = acpi_get_handle(handle, "_EJD", &tmp);
1334 if (ACPI_FAILURE(status))
1335 return status;
1336
1337 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1338 if (ACPI_SUCCESS(status)) {
1339 obj = buffer.pointer;
1340 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1341 ejd);
1342 kfree(buffer.pointer);
1343 }
1344 return status;
1345}
1346EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1347
1348static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1349 struct acpi_device_wakeup *wakeup)
1350{
1351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1352 union acpi_object *package = NULL;
1353 union acpi_object *element = NULL;
1354 acpi_status status;
1355 int err = -ENODATA;
1356
1357 if (!wakeup)
1358 return -EINVAL;
1359
1360 INIT_LIST_HEAD(&wakeup->resources);
1361
1362 /* _PRW */
1363 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1364 if (ACPI_FAILURE(status)) {
1365 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1366 return err;
1367 }
1368
1369 package = (union acpi_object *)buffer.pointer;
1370
1371 if (!package || package->package.count < 2)
1372 goto out;
1373
1374 element = &(package->package.elements[0]);
1375 if (!element)
1376 goto out;
1377
1378 if (element->type == ACPI_TYPE_PACKAGE) {
1379 if ((element->package.count < 2) ||
1380 (element->package.elements[0].type !=
1381 ACPI_TYPE_LOCAL_REFERENCE)
1382 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1383 goto out;
1384
1385 wakeup->gpe_device =
1386 element->package.elements[0].reference.handle;
1387 wakeup->gpe_number =
1388 (u32) element->package.elements[1].integer.value;
1389 } else if (element->type == ACPI_TYPE_INTEGER) {
1390 wakeup->gpe_device = NULL;
1391 wakeup->gpe_number = element->integer.value;
1392 } else {
1393 goto out;
1394 }
1395
1396 element = &(package->package.elements[1]);
1397 if (element->type != ACPI_TYPE_INTEGER)
1398 goto out;
1399
1400 wakeup->sleep_state = element->integer.value;
1401
1402 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1403 if (err)
1404 goto out;
1405
1406 if (!list_empty(&wakeup->resources)) {
1407 int sleep_state;
1408
1409 err = acpi_power_wakeup_list_init(&wakeup->resources,
1410 &sleep_state);
1411 if (err) {
1412 acpi_handle_warn(handle, "Retrieving current states "
1413 "of wakeup power resources failed\n");
1414 acpi_power_resources_list_free(&wakeup->resources);
1415 goto out;
1416 }
1417 if (sleep_state < wakeup->sleep_state) {
1418 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1419 "(S%d) by S%d from power resources\n",
1420 (int)wakeup->sleep_state, sleep_state);
1421 wakeup->sleep_state = sleep_state;
1422 }
1423 }
1424 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1425
1426 out:
1427 kfree(buffer.pointer);
1428 return err;
1429}
1430
1431static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1432{
1433 struct acpi_device_id button_device_ids[] = {
1434 {"PNP0C0C", 0},
1435 {"PNP0C0D", 0},
1436 {"PNP0C0E", 0},
1437 {"", 0},
1438 };
1439 acpi_status status;
1440 acpi_event_status event_status;
1441
1442 device->wakeup.flags.notifier_present = 0;
1443
1444 /* Power button, Lid switch always enable wakeup */
1445 if (!acpi_match_device_ids(device, button_device_ids)) {
1446 device->wakeup.flags.run_wake = 1;
1447 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1448 /* Do not use Lid/sleep button for S5 wakeup */
1449 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1450 device->wakeup.sleep_state = ACPI_STATE_S4;
1451 }
1452 device_set_wakeup_capable(&device->dev, true);
1453 return;
1454 }
1455
1456 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1457 device->wakeup.gpe_number,
1458 &event_status);
1459 if (status == AE_OK)
1460 device->wakeup.flags.run_wake =
1461 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1462}
1463
1464static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1465{
1466 int err;
1467
1468 /* Presence of _PRW indicates wake capable */
1469 if (!acpi_has_method(device->handle, "_PRW"))
1470 return;
1471
1472 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1473 &device->wakeup);
1474 if (err) {
1475 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1476 return;
1477 }
1478
1479 device->wakeup.flags.valid = 1;
1480 device->wakeup.prepare_count = 0;
1481 acpi_bus_set_run_wake_flags(device);
1482 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1483 * system for the ACPI device with the _PRW object.
1484 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1485 * So it is necessary to call _DSW object first. Only when it is not
1486 * present will the _PSW object used.
1487 */
1488 err = acpi_device_sleep_wake(device, 0, 0, 0);
1489 if (err)
1490 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1491 "error in _DSW or _PSW evaluation\n"));
1492}
1493
1494static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1495{
1496 struct acpi_device_power_state *ps = &device->power.states[state];
1497 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1498 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1499 acpi_status status;
1500
1501 INIT_LIST_HEAD(&ps->resources);
1502
1503 /* Evaluate "_PRx" to get referenced power resources */
1504 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1505 if (ACPI_SUCCESS(status)) {
1506 union acpi_object *package = buffer.pointer;
1507
1508 if (buffer.length && package
1509 && package->type == ACPI_TYPE_PACKAGE
1510 && package->package.count) {
1511 int err = acpi_extract_power_resources(package, 0,
1512 &ps->resources);
1513 if (!err)
1514 device->power.flags.power_resources = 1;
1515 }
1516 ACPI_FREE(buffer.pointer);
1517 }
1518
1519 /* Evaluate "_PSx" to see if we can do explicit sets */
1520 pathname[2] = 'S';
1521 if (acpi_has_method(device->handle, pathname))
1522 ps->flags.explicit_set = 1;
1523
1524 /*
1525 * State is valid if there are means to put the device into it.
1526 * D3hot is only valid if _PR3 present.
1527 */
1528 if (!list_empty(&ps->resources)
1529 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1530 ps->flags.valid = 1;
1531 ps->flags.os_accessible = 1;
1532 }
1533
1534 ps->power = -1; /* Unknown - driver assigned */
1535 ps->latency = -1; /* Unknown - driver assigned */
1536}
1537
1538static void acpi_bus_get_power_flags(struct acpi_device *device)
1539{
1540 u32 i;
1541
1542 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1543 if (!acpi_has_method(device->handle, "_PS0") &&
1544 !acpi_has_method(device->handle, "_PR0"))
1545 return;
1546
1547 device->flags.power_manageable = 1;
1548
1549 /*
1550 * Power Management Flags
1551 */
1552 if (acpi_has_method(device->handle, "_PSC"))
1553 device->power.flags.explicit_get = 1;
1554 if (acpi_has_method(device->handle, "_IRC"))
1555 device->power.flags.inrush_current = 1;
1556
1557 /*
1558 * Enumerate supported power management states
1559 */
1560 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1561 acpi_bus_init_power_state(device, i);
1562
1563 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1564
1565 /* Set defaults for D0 and D3 states (always valid) */
1566 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1567 device->power.states[ACPI_STATE_D0].power = 100;
1568 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1569 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1570
1571 /* Set D3cold's explicit_set flag if _PS3 exists. */
1572 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1573 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1574
1575 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1576 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1577 device->power.flags.power_resources)
1578 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1579
1580 if (acpi_bus_init_power(device)) {
1581 acpi_free_power_resources_lists(device);
1582 device->flags.power_manageable = 0;
1583 }
1584}
1585
1586static void acpi_bus_get_flags(struct acpi_device *device)
1587{
1588 /* Presence of _STA indicates 'dynamic_status' */
1589 if (acpi_has_method(device->handle, "_STA"))
1590 device->flags.dynamic_status = 1;
1591
1592 /* Presence of _RMV indicates 'removable' */
1593 if (acpi_has_method(device->handle, "_RMV"))
1594 device->flags.removable = 1;
1595
1596 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1597 if (acpi_has_method(device->handle, "_EJD") ||
1598 acpi_has_method(device->handle, "_EJ0"))
1599 device->flags.ejectable = 1;
1600}
1601
1602static void acpi_device_get_busid(struct acpi_device *device)
1603{
1604 char bus_id[5] = { '?', 0 };
1605 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1606 int i = 0;
1607
1608 /*
1609 * Bus ID
1610 * ------
1611 * The device's Bus ID is simply the object name.
1612 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1613 */
1614 if (ACPI_IS_ROOT_DEVICE(device)) {
1615 strcpy(device->pnp.bus_id, "ACPI");
1616 return;
1617 }
1618
1619 switch (device->device_type) {
1620 case ACPI_BUS_TYPE_POWER_BUTTON:
1621 strcpy(device->pnp.bus_id, "PWRF");
1622 break;
1623 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1624 strcpy(device->pnp.bus_id, "SLPF");
1625 break;
1626 default:
1627 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1628 /* Clean up trailing underscores (if any) */
1629 for (i = 3; i > 1; i--) {
1630 if (bus_id[i] == '_')
1631 bus_id[i] = '\0';
1632 else
1633 break;
1634 }
1635 strcpy(device->pnp.bus_id, bus_id);
1636 break;
1637 }
1638}
1639
1640/*
1641 * acpi_ata_match - see if an acpi object is an ATA device
1642 *
1643 * If an acpi object has one of the ACPI ATA methods defined,
1644 * then we can safely call it an ATA device.
1645 */
1646bool acpi_ata_match(acpi_handle handle)
1647{
1648 return acpi_has_method(handle, "_GTF") ||
1649 acpi_has_method(handle, "_GTM") ||
1650 acpi_has_method(handle, "_STM") ||
1651 acpi_has_method(handle, "_SDD");
1652}
1653
1654/*
1655 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1656 *
1657 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1658 * then we can safely call it an ejectable drive bay
1659 */
1660bool acpi_bay_match(acpi_handle handle)
1661{
1662 acpi_handle phandle;
1663
1664 if (!acpi_has_method(handle, "_EJ0"))
1665 return false;
1666 if (acpi_ata_match(handle))
1667 return true;
1668 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1669 return false;
1670
1671 return acpi_ata_match(phandle);
1672}
1673
1674bool acpi_device_is_battery(struct acpi_device *adev)
1675{
1676 struct acpi_hardware_id *hwid;
1677
1678 list_for_each_entry(hwid, &adev->pnp.ids, list)
1679 if (!strcmp("PNP0C0A", hwid->id))
1680 return true;
1681
1682 return false;
1683}
1684
1685static bool is_ejectable_bay(struct acpi_device *adev)
1686{
1687 acpi_handle handle = adev->handle;
1688
1689 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1690 return true;
1691
1692 return acpi_bay_match(handle);
1693}
1694
1695/*
1696 * acpi_dock_match - see if an acpi object has a _DCK method
1697 */
1698bool acpi_dock_match(acpi_handle handle)
1699{
1700 return acpi_has_method(handle, "_DCK");
1701}
1702
1703const char *acpi_device_hid(struct acpi_device *device)
1704{
1705 struct acpi_hardware_id *hid;
1706
1707 if (list_empty(&device->pnp.ids))
1708 return dummy_hid;
1709
1710 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1711 return hid->id;
1712}
1713EXPORT_SYMBOL(acpi_device_hid);
1714
1715static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1716{
1717 struct acpi_hardware_id *id;
1718
1719 id = kmalloc(sizeof(*id), GFP_KERNEL);
1720 if (!id)
1721 return;
1722
1723 id->id = kstrdup(dev_id, GFP_KERNEL);
1724 if (!id->id) {
1725 kfree(id);
1726 return;
1727 }
1728
1729 list_add_tail(&id->list, &pnp->ids);
1730 pnp->type.hardware_id = 1;
1731}
1732
1733/*
1734 * Old IBM workstations have a DSDT bug wherein the SMBus object
1735 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1736 * prefix. Work around this.
1737 */
1738static bool acpi_ibm_smbus_match(acpi_handle handle)
1739{
1740 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1741 struct acpi_buffer path = { sizeof(node_name), node_name };
1742
1743 if (!dmi_name_in_vendors("IBM"))
1744 return false;
1745
1746 /* Look for SMBS object */
1747 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1748 strcmp("SMBS", path.pointer))
1749 return false;
1750
1751 /* Does it have the necessary (but misnamed) methods? */
1752 if (acpi_has_method(handle, "SBI") &&
1753 acpi_has_method(handle, "SBR") &&
1754 acpi_has_method(handle, "SBW"))
1755 return true;
1756
1757 return false;
1758}
1759
1760static bool acpi_object_is_system_bus(acpi_handle handle)
1761{
1762 acpi_handle tmp;
1763
1764 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1765 tmp == handle)
1766 return true;
1767 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1768 tmp == handle)
1769 return true;
1770
1771 return false;
1772}
1773
1774static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1775 int device_type)
1776{
1777 acpi_status status;
1778 struct acpi_device_info *info;
1779 struct acpi_pnp_device_id_list *cid_list;
1780 int i;
1781
1782 switch (device_type) {
1783 case ACPI_BUS_TYPE_DEVICE:
1784 if (handle == ACPI_ROOT_OBJECT) {
1785 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1786 break;
1787 }
1788
1789 status = acpi_get_object_info(handle, &info);
1790 if (ACPI_FAILURE(status)) {
1791 pr_err(PREFIX "%s: Error reading device info\n",
1792 __func__);
1793 return;
1794 }
1795
1796 if (info->valid & ACPI_VALID_HID)
1797 acpi_add_id(pnp, info->hardware_id.string);
1798 if (info->valid & ACPI_VALID_CID) {
1799 cid_list = &info->compatible_id_list;
1800 for (i = 0; i < cid_list->count; i++)
1801 acpi_add_id(pnp, cid_list->ids[i].string);
1802 }
1803 if (info->valid & ACPI_VALID_ADR) {
1804 pnp->bus_address = info->address;
1805 pnp->type.bus_address = 1;
1806 }
1807 if (info->valid & ACPI_VALID_UID)
1808 pnp->unique_id = kstrdup(info->unique_id.string,
1809 GFP_KERNEL);
1810
1811 kfree(info);
1812
1813 /*
1814 * Some devices don't reliably have _HIDs & _CIDs, so add
1815 * synthetic HIDs to make sure drivers can find them.
1816 */
1817 if (acpi_is_video_device(handle))
1818 acpi_add_id(pnp, ACPI_VIDEO_HID);
1819 else if (acpi_bay_match(handle))
1820 acpi_add_id(pnp, ACPI_BAY_HID);
1821 else if (acpi_dock_match(handle))
1822 acpi_add_id(pnp, ACPI_DOCK_HID);
1823 else if (acpi_ibm_smbus_match(handle))
1824 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1825 else if (list_empty(&pnp->ids) &&
1826 acpi_object_is_system_bus(handle)) {
1827 /* \_SB, \_TZ, LNXSYBUS */
1828 acpi_add_id(pnp, ACPI_BUS_HID);
1829 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1830 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1831 }
1832
1833 break;
1834 case ACPI_BUS_TYPE_POWER:
1835 acpi_add_id(pnp, ACPI_POWER_HID);
1836 break;
1837 case ACPI_BUS_TYPE_PROCESSOR:
1838 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1839 break;
1840 case ACPI_BUS_TYPE_THERMAL:
1841 acpi_add_id(pnp, ACPI_THERMAL_HID);
1842 break;
1843 case ACPI_BUS_TYPE_POWER_BUTTON:
1844 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1845 break;
1846 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1847 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1848 break;
1849 }
1850}
1851
1852void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1853{
1854 struct acpi_hardware_id *id, *tmp;
1855
1856 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1857 kfree(id->id);
1858 kfree(id);
1859 }
1860 kfree(pnp->unique_id);
1861}
1862
1863void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1864 int type, unsigned long long sta)
1865{
1866 INIT_LIST_HEAD(&device->pnp.ids);
1867 device->device_type = type;
1868 device->handle = handle;
1869 device->parent = acpi_bus_get_parent(handle);
1870 acpi_set_device_status(device, sta);
1871 acpi_device_get_busid(device);
1872 acpi_set_pnp_ids(handle, &device->pnp, type);
1873 acpi_bus_get_flags(device);
1874 device->flags.match_driver = false;
1875 device->flags.initialized = true;
1876 device->flags.visited = false;
1877 device_initialize(&device->dev);
1878 dev_set_uevent_suppress(&device->dev, true);
1879}
1880
1881void acpi_device_add_finalize(struct acpi_device *device)
1882{
1883 dev_set_uevent_suppress(&device->dev, false);
1884 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1885}
1886
1887static int acpi_add_single_object(struct acpi_device **child,
1888 acpi_handle handle, int type,
1889 unsigned long long sta)
1890{
1891 int result;
1892 struct acpi_device *device;
1893 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1894
1895 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1896 if (!device) {
1897 printk(KERN_ERR PREFIX "Memory allocation error\n");
1898 return -ENOMEM;
1899 }
1900
1901 acpi_init_device_object(device, handle, type, sta);
1902 acpi_bus_get_power_flags(device);
1903 acpi_bus_get_wakeup_device_flags(device);
1904
1905 result = acpi_device_add(device, acpi_device_release);
1906 if (result) {
1907 acpi_device_release(&device->dev);
1908 return result;
1909 }
1910
1911 acpi_power_add_remove_device(device, true);
1912 acpi_device_add_finalize(device);
1913 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1914 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1915 dev_name(&device->dev), (char *) buffer.pointer,
1916 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1917 kfree(buffer.pointer);
1918 *child = device;
1919 return 0;
1920}
1921
1922static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1923 unsigned long long *sta)
1924{
1925 acpi_status status;
1926 acpi_object_type acpi_type;
1927
1928 status = acpi_get_type(handle, &acpi_type);
1929 if (ACPI_FAILURE(status))
1930 return -ENODEV;
1931
1932 switch (acpi_type) {
1933 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1934 case ACPI_TYPE_DEVICE:
1935 *type = ACPI_BUS_TYPE_DEVICE;
1936 status = acpi_bus_get_status_handle(handle, sta);
1937 if (ACPI_FAILURE(status))
1938 return -ENODEV;
1939 break;
1940 case ACPI_TYPE_PROCESSOR:
1941 *type = ACPI_BUS_TYPE_PROCESSOR;
1942 status = acpi_bus_get_status_handle(handle, sta);
1943 if (ACPI_FAILURE(status))
1944 return -ENODEV;
1945 break;
1946 case ACPI_TYPE_THERMAL:
1947 *type = ACPI_BUS_TYPE_THERMAL;
1948 *sta = ACPI_STA_DEFAULT;
1949 break;
1950 case ACPI_TYPE_POWER:
1951 *type = ACPI_BUS_TYPE_POWER;
1952 *sta = ACPI_STA_DEFAULT;
1953 break;
1954 default:
1955 return -ENODEV;
1956 }
1957
1958 return 0;
1959}
1960
1961bool acpi_device_is_present(struct acpi_device *adev)
1962{
1963 if (adev->status.present || adev->status.functional)
1964 return true;
1965
1966 adev->flags.initialized = false;
1967 return false;
1968}
1969
1970static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1971 char *idstr,
1972 const struct acpi_device_id **matchid)
1973{
1974 const struct acpi_device_id *devid;
1975
1976 for (devid = handler->ids; devid->id[0]; devid++)
1977 if (!strcmp((char *)devid->id, idstr)) {
1978 if (matchid)
1979 *matchid = devid;
1980
1981 return true;
1982 }
1983
1984 return false;
1985}
1986
1987static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1988 const struct acpi_device_id **matchid)
1989{
1990 struct acpi_scan_handler *handler;
1991
1992 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1993 if (acpi_scan_handler_matching(handler, idstr, matchid))
1994 return handler;
1995
1996 return NULL;
1997}
1998
1999void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2000{
2001 if (!!hotplug->enabled == !!val)
2002 return;
2003
2004 mutex_lock(&acpi_scan_lock);
2005
2006 hotplug->enabled = val;
2007
2008 mutex_unlock(&acpi_scan_lock);
2009}
2010
2011static void acpi_scan_init_hotplug(struct acpi_device *adev)
2012{
2013 struct acpi_hardware_id *hwid;
2014
2015 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2016 acpi_dock_add(adev);
2017 return;
2018 }
2019 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2020 struct acpi_scan_handler *handler;
2021
2022 handler = acpi_scan_match_handler(hwid->id, NULL);
2023 if (handler) {
2024 adev->flags.hotplug_notify = true;
2025 break;
2026 }
2027 }
2028}
2029
2030static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2031 void *not_used, void **return_value)
2032{
2033 struct acpi_device *device = NULL;
2034 int type;
2035 unsigned long long sta;
2036 int result;
2037
2038 acpi_bus_get_device(handle, &device);
2039 if (device)
2040 goto out;
2041
2042 result = acpi_bus_type_and_status(handle, &type, &sta);
2043 if (result)
2044 return AE_OK;
2045
2046 if (type == ACPI_BUS_TYPE_POWER) {
2047 acpi_add_power_resource(handle);
2048 return AE_OK;
2049 }
2050
2051 acpi_add_single_object(&device, handle, type, sta);
2052 if (!device)
2053 return AE_CTRL_DEPTH;
2054
2055 acpi_scan_init_hotplug(device);
2056
2057 out:
2058 if (!*return_value)
2059 *return_value = device;
2060
2061 return AE_OK;
2062}
2063
2064static int acpi_scan_attach_handler(struct acpi_device *device)
2065{
2066 struct acpi_hardware_id *hwid;
2067 int ret = 0;
2068
2069 list_for_each_entry(hwid, &device->pnp.ids, list) {
2070 const struct acpi_device_id *devid;
2071 struct acpi_scan_handler *handler;
2072
2073 handler = acpi_scan_match_handler(hwid->id, &devid);
2074 if (handler) {
2075 device->handler = handler;
2076 ret = handler->attach(device, devid);
2077 if (ret > 0)
2078 break;
2079
2080 device->handler = NULL;
2081 if (ret < 0)
2082 break;
2083 }
2084 }
2085 return ret;
2086}
2087
2088static void acpi_bus_attach(struct acpi_device *device)
2089{
2090 struct acpi_device *child;
2091 acpi_handle ejd;
2092 int ret;
2093
2094 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2095 register_dock_dependent_device(device, ejd);
2096
2097 acpi_bus_get_status(device);
2098 /* Skip devices that are not present. */
2099 if (!acpi_device_is_present(device)) {
2100 device->flags.visited = false;
2101 return;
2102 }
2103 if (device->handler)
2104 goto ok;
2105
2106 if (!device->flags.initialized) {
2107 acpi_bus_update_power(device, NULL);
2108 device->flags.initialized = true;
2109 }
2110 device->flags.visited = false;
2111 ret = acpi_scan_attach_handler(device);
2112 if (ret < 0)
2113 return;
2114
2115 device->flags.match_driver = true;
2116 if (!ret) {
2117 ret = device_attach(&device->dev);
2118 if (ret < 0)
2119 return;
2120 }
2121 device->flags.visited = true;
2122
2123 ok:
2124 list_for_each_entry(child, &device->children, node)
2125 acpi_bus_attach(child);
2126}
2127
2128/**
2129 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2130 * @handle: Root of the namespace scope to scan.
2131 *
2132 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2133 * found devices.
2134 *
2135 * If no devices were found, -ENODEV is returned, but it does not mean that
2136 * there has been a real error. There just have been no suitable ACPI objects
2137 * in the table trunk from which the kernel could create a device and add an
2138 * appropriate driver.
2139 *
2140 * Must be called under acpi_scan_lock.
2141 */
2142int acpi_bus_scan(acpi_handle handle)
2143{
2144 void *device = NULL;
2145
2146 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2147 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2148 acpi_bus_check_add, NULL, NULL, &device);
2149
2150 if (device) {
2151 acpi_bus_attach(device);
2152 return 0;
2153 }
2154 return -ENODEV;
2155}
2156EXPORT_SYMBOL(acpi_bus_scan);
2157
2158/**
2159 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2160 * @adev: Root of the ACPI namespace scope to walk.
2161 *
2162 * Must be called under acpi_scan_lock.
2163 */
2164void acpi_bus_trim(struct acpi_device *adev)
2165{
2166 struct acpi_scan_handler *handler = adev->handler;
2167 struct acpi_device *child;
2168
2169 list_for_each_entry_reverse(child, &adev->children, node)
2170 acpi_bus_trim(child);
2171
2172 adev->flags.match_driver = false;
2173 if (handler) {
2174 if (handler->detach)
2175 handler->detach(adev);
2176
2177 adev->handler = NULL;
2178 } else {
2179 device_release_driver(&adev->dev);
2180 }
2181 /*
2182 * Most likely, the device is going away, so put it into D3cold before
2183 * that.
2184 */
2185 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2186 adev->flags.initialized = false;
2187 adev->flags.visited = false;
2188}
2189EXPORT_SYMBOL_GPL(acpi_bus_trim);
2190
2191static int acpi_bus_scan_fixed(void)
2192{
2193 int result = 0;
2194
2195 /*
2196 * Enumerate all fixed-feature devices.
2197 */
2198 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2199 struct acpi_device *device = NULL;
2200
2201 result = acpi_add_single_object(&device, NULL,
2202 ACPI_BUS_TYPE_POWER_BUTTON,
2203 ACPI_STA_DEFAULT);
2204 if (result)
2205 return result;
2206
2207 device->flags.match_driver = true;
2208 result = device_attach(&device->dev);
2209 if (result < 0)
2210 return result;
2211
2212 device_init_wakeup(&device->dev, true);
2213 }
2214
2215 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2216 struct acpi_device *device = NULL;
2217
2218 result = acpi_add_single_object(&device, NULL,
2219 ACPI_BUS_TYPE_SLEEP_BUTTON,
2220 ACPI_STA_DEFAULT);
2221 if (result)
2222 return result;
2223
2224 device->flags.match_driver = true;
2225 result = device_attach(&device->dev);
2226 }
2227
2228 return result < 0 ? result : 0;
2229}
2230
2231int __init acpi_scan_init(void)
2232{
2233 int result;
2234
2235 result = bus_register(&acpi_bus_type);
2236 if (result) {
2237 /* We don't want to quit even if we failed to add suspend/resume */
2238 printk(KERN_ERR PREFIX "Could not register bus type\n");
2239 }
2240
2241 acpi_pci_root_init();
2242 acpi_pci_link_init();
2243 acpi_processor_init();
2244 acpi_platform_init();
2245 acpi_lpss_init();
2246 acpi_cmos_rtc_init();
2247 acpi_container_init();
2248 acpi_memory_hotplug_init();
2249
2250 mutex_lock(&acpi_scan_lock);
2251 /*
2252 * Enumerate devices in the ACPI namespace.
2253 */
2254 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2255 if (result)
2256 goto out;
2257
2258 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2259 if (result)
2260 goto out;
2261
2262 result = acpi_bus_scan_fixed();
2263 if (result) {
2264 acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
2265 acpi_device_del(acpi_root);
2266 put_device(&acpi_root->dev);
2267 goto out;
2268 }
2269
2270 acpi_update_all_gpes();
2271
2272 out:
2273 mutex_unlock(&acpi_scan_lock);
2274 return result;
2275}