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ACPI / PM: Avoid resuming devices in ACPI PM domain during system suspend
[deliverable/linux.git] / drivers / acpi / scan.c
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
20 ACPI_MODULE_NAME("scan");
21 extern 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 */
35 bool acpi_force_hot_remove;
36
37 static const char *dummy_hid = "device";
38
39 static LIST_HEAD(acpi_bus_id_list);
40 static DEFINE_MUTEX(acpi_scan_lock);
41 static LIST_HEAD(acpi_scan_handlers_list);
42 DEFINE_MUTEX(acpi_device_lock);
43 LIST_HEAD(acpi_wakeup_device_list);
44 static DEFINE_MUTEX(acpi_hp_context_lock);
45
46 struct acpi_device_bus_id{
47 char bus_id[15];
48 unsigned int instance_no;
49 struct list_head node;
50 };
51
52 void acpi_scan_lock_acquire(void)
53 {
54 mutex_lock(&acpi_scan_lock);
55 }
56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57
58 void acpi_scan_lock_release(void)
59 {
60 mutex_unlock(&acpi_scan_lock);
61 }
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63
64 void acpi_lock_hp_context(void)
65 {
66 mutex_lock(&acpi_hp_context_lock);
67 }
68
69 void acpi_unlock_hp_context(void)
70 {
71 mutex_unlock(&acpi_hp_context_lock);
72 }
73
74 void 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 }
83 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
84
85 int 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
94 int 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 */
115 static 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 */
148 int 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 }
170 EXPORT_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 */
178 int 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 }
197 EXPORT_SYMBOL_GPL(acpi_device_modalias);
198
199 static ssize_t
200 acpi_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 }
210 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
211
212 bool 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
232 static 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
280 static 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
302 static 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
348 static 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
394 static 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
404 static 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
437 static 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
464 static 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
484 void 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
535 static 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
549 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
550
551 static 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
559 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
560
561 static ssize_t
562 acpi_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, &not_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
591 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
592
593 static ssize_t
594 acpi_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 }
599 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
600
601 static 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 }
608 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
609
610 static 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 }
618 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
619
620 static ssize_t
621 acpi_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);
632 end:
633 return result;
634 }
635 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
636
637 /* sysfs file that shows description text from the ACPI _STR method */
638 static 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 }
661 static DEVICE_ATTR(description, 0444, description_show, NULL);
662
663 static ssize_t
664 acpi_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 }
670 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
671
672 static 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 }
684 static DEVICE_ATTR_RO(status);
685
686 static 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
767 end:
768 return result;
769 }
770
771 static 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
811 static 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 */
843 const 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 }
854 EXPORT_SYMBOL_GPL(acpi_match_device);
855
856 int 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 }
861 EXPORT_SYMBOL(acpi_match_device_ids);
862
863 static 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
879 static 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
888 static 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
897 static 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
915 static 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
922 static 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
931 static 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
956 static 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
969 static 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
1008 static 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
1026 struct 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
1034 static 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
1051 static LIST_HEAD(acpi_device_del_list);
1052 static DEFINE_MUTEX(acpi_device_del_lock);
1053
1054 static 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 */
1094 static 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
1121 static 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
1139 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1140 {
1141 return acpi_get_device_data(handle, device, NULL);
1142 }
1143 EXPORT_SYMBOL(acpi_bus_get_device);
1144
1145 static void get_acpi_device(void *dev)
1146 {
1147 if (dev)
1148 get_device(&((struct acpi_device *)dev)->dev);
1149 }
1150
1151 struct 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
1159 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1160 {
1161 put_device(&adev->dev);
1162 }
1163
1164 int 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 */
1271 int 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
1285 EXPORT_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 */
1294 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1295 {
1296 driver_unregister(&driver->drv);
1297 }
1298
1299 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1300
1301 /* --------------------------------------------------------------------------
1302 Device Enumeration
1303 -------------------------------------------------------------------------- */
1304 static 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
1325 acpi_status
1326 acpi_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 }
1346 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1347
1348 static 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
1431 static 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
1464 static 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
1494 static 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
1538 static 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
1555 if (acpi_has_method(device->handle, "_IRC"))
1556 device->power.flags.inrush_current = 1;
1557
1558 if (acpi_has_method(device->handle, "_DSW"))
1559 device->power.flags.dsw_present = 1;
1560
1561 /*
1562 * Enumerate supported power management states
1563 */
1564 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1565 acpi_bus_init_power_state(device, i);
1566
1567 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1568
1569 /* Set defaults for D0 and D3 states (always valid) */
1570 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1571 device->power.states[ACPI_STATE_D0].power = 100;
1572 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1573 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1574
1575 /* Set D3cold's explicit_set flag if _PS3 exists. */
1576 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1577 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1578
1579 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1580 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1581 device->power.flags.power_resources)
1582 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1583
1584 if (acpi_bus_init_power(device)) {
1585 acpi_free_power_resources_lists(device);
1586 device->flags.power_manageable = 0;
1587 }
1588 }
1589
1590 static void acpi_bus_get_flags(struct acpi_device *device)
1591 {
1592 /* Presence of _STA indicates 'dynamic_status' */
1593 if (acpi_has_method(device->handle, "_STA"))
1594 device->flags.dynamic_status = 1;
1595
1596 /* Presence of _RMV indicates 'removable' */
1597 if (acpi_has_method(device->handle, "_RMV"))
1598 device->flags.removable = 1;
1599
1600 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1601 if (acpi_has_method(device->handle, "_EJD") ||
1602 acpi_has_method(device->handle, "_EJ0"))
1603 device->flags.ejectable = 1;
1604 }
1605
1606 static void acpi_device_get_busid(struct acpi_device *device)
1607 {
1608 char bus_id[5] = { '?', 0 };
1609 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1610 int i = 0;
1611
1612 /*
1613 * Bus ID
1614 * ------
1615 * The device's Bus ID is simply the object name.
1616 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1617 */
1618 if (ACPI_IS_ROOT_DEVICE(device)) {
1619 strcpy(device->pnp.bus_id, "ACPI");
1620 return;
1621 }
1622
1623 switch (device->device_type) {
1624 case ACPI_BUS_TYPE_POWER_BUTTON:
1625 strcpy(device->pnp.bus_id, "PWRF");
1626 break;
1627 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1628 strcpy(device->pnp.bus_id, "SLPF");
1629 break;
1630 default:
1631 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1632 /* Clean up trailing underscores (if any) */
1633 for (i = 3; i > 1; i--) {
1634 if (bus_id[i] == '_')
1635 bus_id[i] = '\0';
1636 else
1637 break;
1638 }
1639 strcpy(device->pnp.bus_id, bus_id);
1640 break;
1641 }
1642 }
1643
1644 /*
1645 * acpi_ata_match - see if an acpi object is an ATA device
1646 *
1647 * If an acpi object has one of the ACPI ATA methods defined,
1648 * then we can safely call it an ATA device.
1649 */
1650 bool acpi_ata_match(acpi_handle handle)
1651 {
1652 return acpi_has_method(handle, "_GTF") ||
1653 acpi_has_method(handle, "_GTM") ||
1654 acpi_has_method(handle, "_STM") ||
1655 acpi_has_method(handle, "_SDD");
1656 }
1657
1658 /*
1659 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1660 *
1661 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1662 * then we can safely call it an ejectable drive bay
1663 */
1664 bool acpi_bay_match(acpi_handle handle)
1665 {
1666 acpi_handle phandle;
1667
1668 if (!acpi_has_method(handle, "_EJ0"))
1669 return false;
1670 if (acpi_ata_match(handle))
1671 return true;
1672 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1673 return false;
1674
1675 return acpi_ata_match(phandle);
1676 }
1677
1678 bool acpi_device_is_battery(struct acpi_device *adev)
1679 {
1680 struct acpi_hardware_id *hwid;
1681
1682 list_for_each_entry(hwid, &adev->pnp.ids, list)
1683 if (!strcmp("PNP0C0A", hwid->id))
1684 return true;
1685
1686 return false;
1687 }
1688
1689 static bool is_ejectable_bay(struct acpi_device *adev)
1690 {
1691 acpi_handle handle = adev->handle;
1692
1693 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1694 return true;
1695
1696 return acpi_bay_match(handle);
1697 }
1698
1699 /*
1700 * acpi_dock_match - see if an acpi object has a _DCK method
1701 */
1702 bool acpi_dock_match(acpi_handle handle)
1703 {
1704 return acpi_has_method(handle, "_DCK");
1705 }
1706
1707 const char *acpi_device_hid(struct acpi_device *device)
1708 {
1709 struct acpi_hardware_id *hid;
1710
1711 if (list_empty(&device->pnp.ids))
1712 return dummy_hid;
1713
1714 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1715 return hid->id;
1716 }
1717 EXPORT_SYMBOL(acpi_device_hid);
1718
1719 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1720 {
1721 struct acpi_hardware_id *id;
1722
1723 id = kmalloc(sizeof(*id), GFP_KERNEL);
1724 if (!id)
1725 return;
1726
1727 id->id = kstrdup(dev_id, GFP_KERNEL);
1728 if (!id->id) {
1729 kfree(id);
1730 return;
1731 }
1732
1733 list_add_tail(&id->list, &pnp->ids);
1734 pnp->type.hardware_id = 1;
1735 }
1736
1737 /*
1738 * Old IBM workstations have a DSDT bug wherein the SMBus object
1739 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1740 * prefix. Work around this.
1741 */
1742 static bool acpi_ibm_smbus_match(acpi_handle handle)
1743 {
1744 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1745 struct acpi_buffer path = { sizeof(node_name), node_name };
1746
1747 if (!dmi_name_in_vendors("IBM"))
1748 return false;
1749
1750 /* Look for SMBS object */
1751 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1752 strcmp("SMBS", path.pointer))
1753 return false;
1754
1755 /* Does it have the necessary (but misnamed) methods? */
1756 if (acpi_has_method(handle, "SBI") &&
1757 acpi_has_method(handle, "SBR") &&
1758 acpi_has_method(handle, "SBW"))
1759 return true;
1760
1761 return false;
1762 }
1763
1764 static bool acpi_object_is_system_bus(acpi_handle handle)
1765 {
1766 acpi_handle tmp;
1767
1768 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1769 tmp == handle)
1770 return true;
1771 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1772 tmp == handle)
1773 return true;
1774
1775 return false;
1776 }
1777
1778 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1779 int device_type)
1780 {
1781 acpi_status status;
1782 struct acpi_device_info *info;
1783 struct acpi_pnp_device_id_list *cid_list;
1784 int i;
1785
1786 switch (device_type) {
1787 case ACPI_BUS_TYPE_DEVICE:
1788 if (handle == ACPI_ROOT_OBJECT) {
1789 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1790 break;
1791 }
1792
1793 status = acpi_get_object_info(handle, &info);
1794 if (ACPI_FAILURE(status)) {
1795 pr_err(PREFIX "%s: Error reading device info\n",
1796 __func__);
1797 return;
1798 }
1799
1800 if (info->valid & ACPI_VALID_HID)
1801 acpi_add_id(pnp, info->hardware_id.string);
1802 if (info->valid & ACPI_VALID_CID) {
1803 cid_list = &info->compatible_id_list;
1804 for (i = 0; i < cid_list->count; i++)
1805 acpi_add_id(pnp, cid_list->ids[i].string);
1806 }
1807 if (info->valid & ACPI_VALID_ADR) {
1808 pnp->bus_address = info->address;
1809 pnp->type.bus_address = 1;
1810 }
1811 if (info->valid & ACPI_VALID_UID)
1812 pnp->unique_id = kstrdup(info->unique_id.string,
1813 GFP_KERNEL);
1814
1815 kfree(info);
1816
1817 /*
1818 * Some devices don't reliably have _HIDs & _CIDs, so add
1819 * synthetic HIDs to make sure drivers can find them.
1820 */
1821 if (acpi_is_video_device(handle))
1822 acpi_add_id(pnp, ACPI_VIDEO_HID);
1823 else if (acpi_bay_match(handle))
1824 acpi_add_id(pnp, ACPI_BAY_HID);
1825 else if (acpi_dock_match(handle))
1826 acpi_add_id(pnp, ACPI_DOCK_HID);
1827 else if (acpi_ibm_smbus_match(handle))
1828 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1829 else if (list_empty(&pnp->ids) &&
1830 acpi_object_is_system_bus(handle)) {
1831 /* \_SB, \_TZ, LNXSYBUS */
1832 acpi_add_id(pnp, ACPI_BUS_HID);
1833 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1834 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1835 }
1836
1837 break;
1838 case ACPI_BUS_TYPE_POWER:
1839 acpi_add_id(pnp, ACPI_POWER_HID);
1840 break;
1841 case ACPI_BUS_TYPE_PROCESSOR:
1842 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1843 break;
1844 case ACPI_BUS_TYPE_THERMAL:
1845 acpi_add_id(pnp, ACPI_THERMAL_HID);
1846 break;
1847 case ACPI_BUS_TYPE_POWER_BUTTON:
1848 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1849 break;
1850 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1851 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1852 break;
1853 }
1854 }
1855
1856 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1857 {
1858 struct acpi_hardware_id *id, *tmp;
1859
1860 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1861 kfree(id->id);
1862 kfree(id);
1863 }
1864 kfree(pnp->unique_id);
1865 }
1866
1867 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1868 int type, unsigned long long sta)
1869 {
1870 INIT_LIST_HEAD(&device->pnp.ids);
1871 device->device_type = type;
1872 device->handle = handle;
1873 device->parent = acpi_bus_get_parent(handle);
1874 acpi_set_device_status(device, sta);
1875 acpi_device_get_busid(device);
1876 acpi_set_pnp_ids(handle, &device->pnp, type);
1877 acpi_bus_get_flags(device);
1878 device->flags.match_driver = false;
1879 device->flags.initialized = true;
1880 device->flags.visited = false;
1881 device_initialize(&device->dev);
1882 dev_set_uevent_suppress(&device->dev, true);
1883 }
1884
1885 void acpi_device_add_finalize(struct acpi_device *device)
1886 {
1887 dev_set_uevent_suppress(&device->dev, false);
1888 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1889 }
1890
1891 static int acpi_add_single_object(struct acpi_device **child,
1892 acpi_handle handle, int type,
1893 unsigned long long sta)
1894 {
1895 int result;
1896 struct acpi_device *device;
1897 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1898
1899 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1900 if (!device) {
1901 printk(KERN_ERR PREFIX "Memory allocation error\n");
1902 return -ENOMEM;
1903 }
1904
1905 acpi_init_device_object(device, handle, type, sta);
1906 acpi_bus_get_power_flags(device);
1907 acpi_bus_get_wakeup_device_flags(device);
1908
1909 result = acpi_device_add(device, acpi_device_release);
1910 if (result) {
1911 acpi_device_release(&device->dev);
1912 return result;
1913 }
1914
1915 acpi_power_add_remove_device(device, true);
1916 acpi_device_add_finalize(device);
1917 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1918 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1919 dev_name(&device->dev), (char *) buffer.pointer,
1920 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1921 kfree(buffer.pointer);
1922 *child = device;
1923 return 0;
1924 }
1925
1926 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1927 unsigned long long *sta)
1928 {
1929 acpi_status status;
1930 acpi_object_type acpi_type;
1931
1932 status = acpi_get_type(handle, &acpi_type);
1933 if (ACPI_FAILURE(status))
1934 return -ENODEV;
1935
1936 switch (acpi_type) {
1937 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1938 case ACPI_TYPE_DEVICE:
1939 *type = ACPI_BUS_TYPE_DEVICE;
1940 status = acpi_bus_get_status_handle(handle, sta);
1941 if (ACPI_FAILURE(status))
1942 return -ENODEV;
1943 break;
1944 case ACPI_TYPE_PROCESSOR:
1945 *type = ACPI_BUS_TYPE_PROCESSOR;
1946 status = acpi_bus_get_status_handle(handle, sta);
1947 if (ACPI_FAILURE(status))
1948 return -ENODEV;
1949 break;
1950 case ACPI_TYPE_THERMAL:
1951 *type = ACPI_BUS_TYPE_THERMAL;
1952 *sta = ACPI_STA_DEFAULT;
1953 break;
1954 case ACPI_TYPE_POWER:
1955 *type = ACPI_BUS_TYPE_POWER;
1956 *sta = ACPI_STA_DEFAULT;
1957 break;
1958 default:
1959 return -ENODEV;
1960 }
1961
1962 return 0;
1963 }
1964
1965 bool acpi_device_is_present(struct acpi_device *adev)
1966 {
1967 if (adev->status.present || adev->status.functional)
1968 return true;
1969
1970 adev->flags.initialized = false;
1971 return false;
1972 }
1973
1974 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1975 char *idstr,
1976 const struct acpi_device_id **matchid)
1977 {
1978 const struct acpi_device_id *devid;
1979
1980 for (devid = handler->ids; devid->id[0]; devid++)
1981 if (!strcmp((char *)devid->id, idstr)) {
1982 if (matchid)
1983 *matchid = devid;
1984
1985 return true;
1986 }
1987
1988 return false;
1989 }
1990
1991 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1992 const struct acpi_device_id **matchid)
1993 {
1994 struct acpi_scan_handler *handler;
1995
1996 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1997 if (acpi_scan_handler_matching(handler, idstr, matchid))
1998 return handler;
1999
2000 return NULL;
2001 }
2002
2003 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2004 {
2005 if (!!hotplug->enabled == !!val)
2006 return;
2007
2008 mutex_lock(&acpi_scan_lock);
2009
2010 hotplug->enabled = val;
2011
2012 mutex_unlock(&acpi_scan_lock);
2013 }
2014
2015 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2016 {
2017 struct acpi_hardware_id *hwid;
2018
2019 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2020 acpi_dock_add(adev);
2021 return;
2022 }
2023 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2024 struct acpi_scan_handler *handler;
2025
2026 handler = acpi_scan_match_handler(hwid->id, NULL);
2027 if (handler) {
2028 adev->flags.hotplug_notify = true;
2029 break;
2030 }
2031 }
2032 }
2033
2034 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2035 void *not_used, void **return_value)
2036 {
2037 struct acpi_device *device = NULL;
2038 int type;
2039 unsigned long long sta;
2040 int result;
2041
2042 acpi_bus_get_device(handle, &device);
2043 if (device)
2044 goto out;
2045
2046 result = acpi_bus_type_and_status(handle, &type, &sta);
2047 if (result)
2048 return AE_OK;
2049
2050 if (type == ACPI_BUS_TYPE_POWER) {
2051 acpi_add_power_resource(handle);
2052 return AE_OK;
2053 }
2054
2055 acpi_add_single_object(&device, handle, type, sta);
2056 if (!device)
2057 return AE_CTRL_DEPTH;
2058
2059 acpi_scan_init_hotplug(device);
2060
2061 out:
2062 if (!*return_value)
2063 *return_value = device;
2064
2065 return AE_OK;
2066 }
2067
2068 static int acpi_scan_attach_handler(struct acpi_device *device)
2069 {
2070 struct acpi_hardware_id *hwid;
2071 int ret = 0;
2072
2073 list_for_each_entry(hwid, &device->pnp.ids, list) {
2074 const struct acpi_device_id *devid;
2075 struct acpi_scan_handler *handler;
2076
2077 handler = acpi_scan_match_handler(hwid->id, &devid);
2078 if (handler) {
2079 device->handler = handler;
2080 ret = handler->attach(device, devid);
2081 if (ret > 0)
2082 break;
2083
2084 device->handler = NULL;
2085 if (ret < 0)
2086 break;
2087 }
2088 }
2089 return ret;
2090 }
2091
2092 static void acpi_bus_attach(struct acpi_device *device)
2093 {
2094 struct acpi_device *child;
2095 acpi_handle ejd;
2096 int ret;
2097
2098 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2099 register_dock_dependent_device(device, ejd);
2100
2101 acpi_bus_get_status(device);
2102 /* Skip devices that are not present. */
2103 if (!acpi_device_is_present(device)) {
2104 device->flags.visited = false;
2105 return;
2106 }
2107 if (device->handler)
2108 goto ok;
2109
2110 if (!device->flags.initialized) {
2111 acpi_bus_update_power(device, NULL);
2112 device->flags.initialized = true;
2113 }
2114 device->flags.visited = false;
2115 ret = acpi_scan_attach_handler(device);
2116 if (ret < 0)
2117 return;
2118
2119 device->flags.match_driver = true;
2120 if (!ret) {
2121 ret = device_attach(&device->dev);
2122 if (ret < 0)
2123 return;
2124 }
2125 device->flags.visited = true;
2126
2127 ok:
2128 list_for_each_entry(child, &device->children, node)
2129 acpi_bus_attach(child);
2130 }
2131
2132 /**
2133 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2134 * @handle: Root of the namespace scope to scan.
2135 *
2136 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2137 * found devices.
2138 *
2139 * If no devices were found, -ENODEV is returned, but it does not mean that
2140 * there has been a real error. There just have been no suitable ACPI objects
2141 * in the table trunk from which the kernel could create a device and add an
2142 * appropriate driver.
2143 *
2144 * Must be called under acpi_scan_lock.
2145 */
2146 int acpi_bus_scan(acpi_handle handle)
2147 {
2148 void *device = NULL;
2149
2150 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2151 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2152 acpi_bus_check_add, NULL, NULL, &device);
2153
2154 if (device) {
2155 acpi_bus_attach(device);
2156 return 0;
2157 }
2158 return -ENODEV;
2159 }
2160 EXPORT_SYMBOL(acpi_bus_scan);
2161
2162 /**
2163 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2164 * @adev: Root of the ACPI namespace scope to walk.
2165 *
2166 * Must be called under acpi_scan_lock.
2167 */
2168 void acpi_bus_trim(struct acpi_device *adev)
2169 {
2170 struct acpi_scan_handler *handler = adev->handler;
2171 struct acpi_device *child;
2172
2173 list_for_each_entry_reverse(child, &adev->children, node)
2174 acpi_bus_trim(child);
2175
2176 adev->flags.match_driver = false;
2177 if (handler) {
2178 if (handler->detach)
2179 handler->detach(adev);
2180
2181 adev->handler = NULL;
2182 } else {
2183 device_release_driver(&adev->dev);
2184 }
2185 /*
2186 * Most likely, the device is going away, so put it into D3cold before
2187 * that.
2188 */
2189 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2190 adev->flags.initialized = false;
2191 adev->flags.visited = false;
2192 }
2193 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2194
2195 static int acpi_bus_scan_fixed(void)
2196 {
2197 int result = 0;
2198
2199 /*
2200 * Enumerate all fixed-feature devices.
2201 */
2202 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2203 struct acpi_device *device = NULL;
2204
2205 result = acpi_add_single_object(&device, NULL,
2206 ACPI_BUS_TYPE_POWER_BUTTON,
2207 ACPI_STA_DEFAULT);
2208 if (result)
2209 return result;
2210
2211 device->flags.match_driver = true;
2212 result = device_attach(&device->dev);
2213 if (result < 0)
2214 return result;
2215
2216 device_init_wakeup(&device->dev, true);
2217 }
2218
2219 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2220 struct acpi_device *device = NULL;
2221
2222 result = acpi_add_single_object(&device, NULL,
2223 ACPI_BUS_TYPE_SLEEP_BUTTON,
2224 ACPI_STA_DEFAULT);
2225 if (result)
2226 return result;
2227
2228 device->flags.match_driver = true;
2229 result = device_attach(&device->dev);
2230 }
2231
2232 return result < 0 ? result : 0;
2233 }
2234
2235 int __init acpi_scan_init(void)
2236 {
2237 int result;
2238
2239 result = bus_register(&acpi_bus_type);
2240 if (result) {
2241 /* We don't want to quit even if we failed to add suspend/resume */
2242 printk(KERN_ERR PREFIX "Could not register bus type\n");
2243 }
2244
2245 acpi_pci_root_init();
2246 acpi_pci_link_init();
2247 acpi_processor_init();
2248 acpi_platform_init();
2249 acpi_lpss_init();
2250 acpi_cmos_rtc_init();
2251 acpi_container_init();
2252 acpi_memory_hotplug_init();
2253
2254 mutex_lock(&acpi_scan_lock);
2255 /*
2256 * Enumerate devices in the ACPI namespace.
2257 */
2258 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2259 if (result)
2260 goto out;
2261
2262 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2263 if (result)
2264 goto out;
2265
2266 result = acpi_bus_scan_fixed();
2267 if (result) {
2268 acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
2269 acpi_device_del(acpi_root);
2270 put_device(&acpi_root->dev);
2271 goto out;
2272 }
2273
2274 acpi_update_all_gpes();
2275
2276 out:
2277 mutex_unlock(&acpi_scan_lock);
2278 return result;
2279 }
Linux kernel - Deliverables
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