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Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 hp->notify = notify;
81 hp->uevent = uevent;
82 acpi_set_hp_context(adev, hp);
83 acpi_unlock_hp_context();
84 }
85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
86
87 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
88 {
89 if (!handler)
90 return -EINVAL;
91
92 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
93 return 0;
94 }
95
96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
97 const char *hotplug_profile_name)
98 {
99 int error;
100
101 error = acpi_scan_add_handler(handler);
102 if (error)
103 return error;
104
105 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
106 return 0;
107 }
108
109 /*
110 * Creates hid/cid(s) string needed for modalias and uevent
111 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
112 * char *modalias: "acpi:IBM0001:ACPI0001"
113 * Return: 0: no _HID and no _CID
114 * -EINVAL: output error
115 * -ENOMEM: output is truncated
116 */
117 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
118 int size)
119 {
120 int len;
121 int count;
122 struct acpi_hardware_id *id;
123
124 if (list_empty(&acpi_dev->pnp.ids))
125 return 0;
126
127 len = snprintf(modalias, size, "acpi:");
128 size -= len;
129
130 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
131 count = snprintf(&modalias[len], size, "%s:", id->id);
132 if (count < 0)
133 return -EINVAL;
134 if (count >= size)
135 return -ENOMEM;
136 len += count;
137 size -= count;
138 }
139
140 modalias[len] = '\0';
141 return len;
142 }
143
144 /*
145 * Creates uevent modalias field for ACPI enumerated devices.
146 * Because the other buses does not support ACPI HIDs & CIDs.
147 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
148 * "acpi:IBM0001:ACPI0001"
149 */
150 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
151 {
152 struct acpi_device *acpi_dev;
153 int len;
154
155 acpi_dev = ACPI_COMPANION(dev);
156 if (!acpi_dev)
157 return -ENODEV;
158
159 /* Fall back to bus specific way of modalias exporting */
160 if (list_empty(&acpi_dev->pnp.ids))
161 return -ENODEV;
162
163 if (add_uevent_var(env, "MODALIAS="))
164 return -ENOMEM;
165 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
166 sizeof(env->buf) - env->buflen);
167 if (len <= 0)
168 return len;
169 env->buflen += len;
170 return 0;
171 }
172 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
173
174 /*
175 * Creates modalias sysfs attribute for ACPI enumerated devices.
176 * Because the other buses does not support ACPI HIDs & CIDs.
177 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
178 * "acpi:IBM0001:ACPI0001"
179 */
180 int acpi_device_modalias(struct device *dev, char *buf, int size)
181 {
182 struct acpi_device *acpi_dev;
183 int len;
184
185 acpi_dev = ACPI_COMPANION(dev);
186 if (!acpi_dev)
187 return -ENODEV;
188
189 /* Fall back to bus specific way of modalias exporting */
190 if (list_empty(&acpi_dev->pnp.ids))
191 return -ENODEV;
192
193 len = create_modalias(acpi_dev, buf, size -1);
194 if (len <= 0)
195 return len;
196 buf[len++] = '\n';
197 return len;
198 }
199 EXPORT_SYMBOL_GPL(acpi_device_modalias);
200
201 static ssize_t
202 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
203 struct acpi_device *acpi_dev = to_acpi_device(dev);
204 int len;
205
206 len = create_modalias(acpi_dev, buf, 1024);
207 if (len <= 0)
208 return len;
209 buf[len++] = '\n';
210 return len;
211 }
212 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
213
214 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
215 {
216 struct acpi_device_physical_node *pn;
217 bool offline = true;
218
219 mutex_lock(&adev->physical_node_lock);
220
221 list_for_each_entry(pn, &adev->physical_node_list, node)
222 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
223 if (uevent)
224 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
225
226 offline = false;
227 break;
228 }
229
230 mutex_unlock(&adev->physical_node_lock);
231 return offline;
232 }
233
234 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
235 void **ret_p)
236 {
237 struct acpi_device *device = NULL;
238 struct acpi_device_physical_node *pn;
239 bool second_pass = (bool)data;
240 acpi_status status = AE_OK;
241
242 if (acpi_bus_get_device(handle, &device))
243 return AE_OK;
244
245 if (device->handler && !device->handler->hotplug.enabled) {
246 *ret_p = &device->dev;
247 return AE_SUPPORT;
248 }
249
250 mutex_lock(&device->physical_node_lock);
251
252 list_for_each_entry(pn, &device->physical_node_list, node) {
253 int ret;
254
255 if (second_pass) {
256 /* Skip devices offlined by the first pass. */
257 if (pn->put_online)
258 continue;
259 } else {
260 pn->put_online = false;
261 }
262 ret = device_offline(pn->dev);
263 if (acpi_force_hot_remove)
264 continue;
265
266 if (ret >= 0) {
267 pn->put_online = !ret;
268 } else {
269 *ret_p = pn->dev;
270 if (second_pass) {
271 status = AE_ERROR;
272 break;
273 }
274 }
275 }
276
277 mutex_unlock(&device->physical_node_lock);
278
279 return status;
280 }
281
282 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
283 void **ret_p)
284 {
285 struct acpi_device *device = NULL;
286 struct acpi_device_physical_node *pn;
287
288 if (acpi_bus_get_device(handle, &device))
289 return AE_OK;
290
291 mutex_lock(&device->physical_node_lock);
292
293 list_for_each_entry(pn, &device->physical_node_list, node)
294 if (pn->put_online) {
295 device_online(pn->dev);
296 pn->put_online = false;
297 }
298
299 mutex_unlock(&device->physical_node_lock);
300
301 return AE_OK;
302 }
303
304 static int acpi_scan_try_to_offline(struct acpi_device *device)
305 {
306 acpi_handle handle = device->handle;
307 struct device *errdev = NULL;
308 acpi_status status;
309
310 /*
311 * Carry out two passes here and ignore errors in the first pass,
312 * because if the devices in question are memory blocks and
313 * CONFIG_MEMCG is set, one of the blocks may hold data structures
314 * that the other blocks depend on, but it is not known in advance which
315 * block holds them.
316 *
317 * If the first pass is successful, the second one isn't needed, though.
318 */
319 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
320 NULL, acpi_bus_offline, (void *)false,
321 (void **)&errdev);
322 if (status == AE_SUPPORT) {
323 dev_warn(errdev, "Offline disabled.\n");
324 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
325 acpi_bus_online, NULL, NULL, NULL);
326 return -EPERM;
327 }
328 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
329 if (errdev) {
330 errdev = NULL;
331 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
332 NULL, acpi_bus_offline, (void *)true,
333 (void **)&errdev);
334 if (!errdev || acpi_force_hot_remove)
335 acpi_bus_offline(handle, 0, (void *)true,
336 (void **)&errdev);
337
338 if (errdev && !acpi_force_hot_remove) {
339 dev_warn(errdev, "Offline failed.\n");
340 acpi_bus_online(handle, 0, NULL, NULL);
341 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
342 ACPI_UINT32_MAX, acpi_bus_online,
343 NULL, NULL, NULL);
344 return -EBUSY;
345 }
346 }
347 return 0;
348 }
349
350 static int acpi_scan_hot_remove(struct acpi_device *device)
351 {
352 acpi_handle handle = device->handle;
353 unsigned long long sta;
354 acpi_status status;
355
356 if (device->handler && device->handler->hotplug.demand_offline
357 && !acpi_force_hot_remove) {
358 if (!acpi_scan_is_offline(device, true))
359 return -EBUSY;
360 } else {
361 int error = acpi_scan_try_to_offline(device);
362 if (error)
363 return error;
364 }
365
366 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
367 "Hot-removing device %s...\n", dev_name(&device->dev)));
368
369 acpi_bus_trim(device);
370
371 acpi_evaluate_lck(handle, 0);
372 /*
373 * TBD: _EJD support.
374 */
375 status = acpi_evaluate_ej0(handle);
376 if (status == AE_NOT_FOUND)
377 return -ENODEV;
378 else if (ACPI_FAILURE(status))
379 return -EIO;
380
381 /*
382 * Verify if eject was indeed successful. If not, log an error
383 * message. No need to call _OST since _EJ0 call was made OK.
384 */
385 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
386 if (ACPI_FAILURE(status)) {
387 acpi_handle_warn(handle,
388 "Status check after eject failed (0x%x)\n", status);
389 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
390 acpi_handle_warn(handle,
391 "Eject incomplete - status 0x%llx\n", sta);
392 }
393
394 return 0;
395 }
396
397 static int acpi_scan_device_not_present(struct acpi_device *adev)
398 {
399 if (!acpi_device_enumerated(adev)) {
400 dev_warn(&adev->dev, "Still not present\n");
401 return -EALREADY;
402 }
403 acpi_bus_trim(adev);
404 return 0;
405 }
406
407 static int acpi_scan_device_check(struct acpi_device *adev)
408 {
409 int error;
410
411 acpi_bus_get_status(adev);
412 if (adev->status.present || adev->status.functional) {
413 /*
414 * This function is only called for device objects for which
415 * matching scan handlers exist. The only situation in which
416 * the scan handler is not attached to this device object yet
417 * is when the device has just appeared (either it wasn't
418 * present at all before or it was removed and then added
419 * again).
420 */
421 if (adev->handler) {
422 dev_warn(&adev->dev, "Already enumerated\n");
423 return -EALREADY;
424 }
425 error = acpi_bus_scan(adev->handle);
426 if (error) {
427 dev_warn(&adev->dev, "Namespace scan failure\n");
428 return error;
429 }
430 if (!adev->handler) {
431 dev_warn(&adev->dev, "Enumeration failure\n");
432 error = -ENODEV;
433 }
434 } else {
435 error = acpi_scan_device_not_present(adev);
436 }
437 return error;
438 }
439
440 static int acpi_scan_bus_check(struct acpi_device *adev)
441 {
442 struct acpi_scan_handler *handler = adev->handler;
443 struct acpi_device *child;
444 int error;
445
446 acpi_bus_get_status(adev);
447 if (!(adev->status.present || adev->status.functional)) {
448 acpi_scan_device_not_present(adev);
449 return 0;
450 }
451 if (handler && handler->hotplug.scan_dependent)
452 return handler->hotplug.scan_dependent(adev);
453
454 error = acpi_bus_scan(adev->handle);
455 if (error) {
456 dev_warn(&adev->dev, "Namespace scan failure\n");
457 return error;
458 }
459 list_for_each_entry(child, &adev->children, node) {
460 error = acpi_scan_bus_check(child);
461 if (error)
462 return error;
463 }
464 return 0;
465 }
466
467 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
468 {
469 switch (type) {
470 case ACPI_NOTIFY_BUS_CHECK:
471 return acpi_scan_bus_check(adev);
472 case ACPI_NOTIFY_DEVICE_CHECK:
473 return acpi_scan_device_check(adev);
474 case ACPI_NOTIFY_EJECT_REQUEST:
475 case ACPI_OST_EC_OSPM_EJECT:
476 if (adev->handler && !adev->handler->hotplug.enabled) {
477 dev_info(&adev->dev, "Eject disabled\n");
478 return -EPERM;
479 }
480 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
481 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
482 return acpi_scan_hot_remove(adev);
483 }
484 return -EINVAL;
485 }
486
487 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
488 {
489 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
490 int error = -ENODEV;
491
492 lock_device_hotplug();
493 mutex_lock(&acpi_scan_lock);
494
495 /*
496 * The device object's ACPI handle cannot become invalid as long as we
497 * are holding acpi_scan_lock, but it might have become invalid before
498 * that lock was acquired.
499 */
500 if (adev->handle == INVALID_ACPI_HANDLE)
501 goto err_out;
502
503 if (adev->flags.is_dock_station) {
504 error = dock_notify(adev, src);
505 } else if (adev->flags.hotplug_notify) {
506 error = acpi_generic_hotplug_event(adev, src);
507 if (error == -EPERM) {
508 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
509 goto err_out;
510 }
511 } else {
512 int (*notify)(struct acpi_device *, u32);
513
514 acpi_lock_hp_context();
515 notify = adev->hp ? adev->hp->notify : NULL;
516 acpi_unlock_hp_context();
517 /*
518 * There may be additional notify handlers for device objects
519 * without the .event() callback, so ignore them here.
520 */
521 if (notify)
522 error = notify(adev, src);
523 else
524 goto out;
525 }
526 if (!error)
527 ost_code = ACPI_OST_SC_SUCCESS;
528
529 err_out:
530 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
531
532 out:
533 acpi_bus_put_acpi_device(adev);
534 mutex_unlock(&acpi_scan_lock);
535 unlock_device_hotplug();
536 }
537
538 static ssize_t real_power_state_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
540 {
541 struct acpi_device *adev = to_acpi_device(dev);
542 int state;
543 int ret;
544
545 ret = acpi_device_get_power(adev, &state);
546 if (ret)
547 return ret;
548
549 return sprintf(buf, "%s\n", acpi_power_state_string(state));
550 }
551
552 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
553
554 static ssize_t power_state_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
556 {
557 struct acpi_device *adev = to_acpi_device(dev);
558
559 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
560 }
561
562 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
563
564 static ssize_t
565 acpi_eject_store(struct device *d, struct device_attribute *attr,
566 const char *buf, size_t count)
567 {
568 struct acpi_device *acpi_device = to_acpi_device(d);
569 acpi_object_type not_used;
570 acpi_status status;
571
572 if (!count || buf[0] != '1')
573 return -EINVAL;
574
575 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
576 && !acpi_device->driver)
577 return -ENODEV;
578
579 status = acpi_get_type(acpi_device->handle, &not_used);
580 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
581 return -ENODEV;
582
583 get_device(&acpi_device->dev);
584 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
585 if (ACPI_SUCCESS(status))
586 return count;
587
588 put_device(&acpi_device->dev);
589 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
590 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
591 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
592 }
593
594 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
595
596 static ssize_t
597 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
598 struct acpi_device *acpi_dev = to_acpi_device(dev);
599
600 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
601 }
602 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
603
604 static ssize_t acpi_device_uid_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
606 {
607 struct acpi_device *acpi_dev = to_acpi_device(dev);
608
609 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
610 }
611 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
612
613 static ssize_t acpi_device_adr_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
615 {
616 struct acpi_device *acpi_dev = to_acpi_device(dev);
617
618 return sprintf(buf, "0x%08x\n",
619 (unsigned int)(acpi_dev->pnp.bus_address));
620 }
621 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
622
623 static ssize_t
624 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
625 struct acpi_device *acpi_dev = to_acpi_device(dev);
626 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
627 int result;
628
629 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
630 if (result)
631 goto end;
632
633 result = sprintf(buf, "%s\n", (char*)path.pointer);
634 kfree(path.pointer);
635 end:
636 return result;
637 }
638 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
639
640 /* sysfs file that shows description text from the ACPI _STR method */
641 static ssize_t description_show(struct device *dev,
642 struct device_attribute *attr,
643 char *buf) {
644 struct acpi_device *acpi_dev = to_acpi_device(dev);
645 int result;
646
647 if (acpi_dev->pnp.str_obj == NULL)
648 return 0;
649
650 /*
651 * The _STR object contains a Unicode identifier for a device.
652 * We need to convert to utf-8 so it can be displayed.
653 */
654 result = utf16s_to_utf8s(
655 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
656 acpi_dev->pnp.str_obj->buffer.length,
657 UTF16_LITTLE_ENDIAN, buf,
658 PAGE_SIZE);
659
660 buf[result++] = '\n';
661
662 return result;
663 }
664 static DEVICE_ATTR(description, 0444, description_show, NULL);
665
666 static ssize_t
667 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
668 char *buf) {
669 struct acpi_device *acpi_dev = to_acpi_device(dev);
670 acpi_status status;
671 unsigned long long sun;
672
673 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
674 if (ACPI_FAILURE(status))
675 return -ENODEV;
676
677 return sprintf(buf, "%llu\n", sun);
678 }
679 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
680
681 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
682 char *buf) {
683 struct acpi_device *acpi_dev = to_acpi_device(dev);
684 acpi_status status;
685 unsigned long long sta;
686
687 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
688 if (ACPI_FAILURE(status))
689 return -ENODEV;
690
691 return sprintf(buf, "%llu\n", sta);
692 }
693 static DEVICE_ATTR_RO(status);
694
695 static int acpi_device_setup_files(struct acpi_device *dev)
696 {
697 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
698 acpi_status status;
699 int result = 0;
700
701 /*
702 * Devices gotten from FADT don't have a "path" attribute
703 */
704 if (dev->handle) {
705 result = device_create_file(&dev->dev, &dev_attr_path);
706 if (result)
707 goto end;
708 }
709
710 if (!list_empty(&dev->pnp.ids)) {
711 result = device_create_file(&dev->dev, &dev_attr_hid);
712 if (result)
713 goto end;
714
715 result = device_create_file(&dev->dev, &dev_attr_modalias);
716 if (result)
717 goto end;
718 }
719
720 /*
721 * If device has _STR, 'description' file is created
722 */
723 if (acpi_has_method(dev->handle, "_STR")) {
724 status = acpi_evaluate_object(dev->handle, "_STR",
725 NULL, &buffer);
726 if (ACPI_FAILURE(status))
727 buffer.pointer = NULL;
728 dev->pnp.str_obj = buffer.pointer;
729 result = device_create_file(&dev->dev, &dev_attr_description);
730 if (result)
731 goto end;
732 }
733
734 if (dev->pnp.type.bus_address)
735 result = device_create_file(&dev->dev, &dev_attr_adr);
736 if (dev->pnp.unique_id)
737 result = device_create_file(&dev->dev, &dev_attr_uid);
738
739 if (acpi_has_method(dev->handle, "_SUN")) {
740 result = device_create_file(&dev->dev, &dev_attr_sun);
741 if (result)
742 goto end;
743 }
744
745 if (acpi_has_method(dev->handle, "_STA")) {
746 result = device_create_file(&dev->dev, &dev_attr_status);
747 if (result)
748 goto end;
749 }
750
751 /*
752 * If device has _EJ0, 'eject' file is created that is used to trigger
753 * hot-removal function from userland.
754 */
755 if (acpi_has_method(dev->handle, "_EJ0")) {
756 result = device_create_file(&dev->dev, &dev_attr_eject);
757 if (result)
758 return result;
759 }
760
761 if (dev->flags.power_manageable) {
762 result = device_create_file(&dev->dev, &dev_attr_power_state);
763 if (result)
764 return result;
765
766 if (dev->power.flags.power_resources)
767 result = device_create_file(&dev->dev,
768 &dev_attr_real_power_state);
769 }
770
771 end:
772 return result;
773 }
774
775 static void acpi_device_remove_files(struct acpi_device *dev)
776 {
777 if (dev->flags.power_manageable) {
778 device_remove_file(&dev->dev, &dev_attr_power_state);
779 if (dev->power.flags.power_resources)
780 device_remove_file(&dev->dev,
781 &dev_attr_real_power_state);
782 }
783
784 /*
785 * If device has _STR, remove 'description' file
786 */
787 if (acpi_has_method(dev->handle, "_STR")) {
788 kfree(dev->pnp.str_obj);
789 device_remove_file(&dev->dev, &dev_attr_description);
790 }
791 /*
792 * If device has _EJ0, remove 'eject' file.
793 */
794 if (acpi_has_method(dev->handle, "_EJ0"))
795 device_remove_file(&dev->dev, &dev_attr_eject);
796
797 if (acpi_has_method(dev->handle, "_SUN"))
798 device_remove_file(&dev->dev, &dev_attr_sun);
799
800 if (dev->pnp.unique_id)
801 device_remove_file(&dev->dev, &dev_attr_uid);
802 if (dev->pnp.type.bus_address)
803 device_remove_file(&dev->dev, &dev_attr_adr);
804 device_remove_file(&dev->dev, &dev_attr_modalias);
805 device_remove_file(&dev->dev, &dev_attr_hid);
806 if (acpi_has_method(dev->handle, "_STA"))
807 device_remove_file(&dev->dev, &dev_attr_status);
808 if (dev->handle)
809 device_remove_file(&dev->dev, &dev_attr_path);
810 }
811 /* --------------------------------------------------------------------------
812 ACPI Bus operations
813 -------------------------------------------------------------------------- */
814
815 static const struct acpi_device_id *__acpi_match_device(
816 struct acpi_device *device, const struct acpi_device_id *ids)
817 {
818 const struct acpi_device_id *id;
819 struct acpi_hardware_id *hwid;
820
821 /*
822 * If the device is not present, it is unnecessary to load device
823 * driver for it.
824 */
825 if (!device->status.present)
826 return NULL;
827
828 for (id = ids; id->id[0]; id++)
829 list_for_each_entry(hwid, &device->pnp.ids, list)
830 if (!strcmp((char *) id->id, hwid->id))
831 return id;
832
833 return NULL;
834 }
835
836 /**
837 * acpi_match_device - Match a struct device against a given list of ACPI IDs
838 * @ids: Array of struct acpi_device_id object to match against.
839 * @dev: The device structure to match.
840 *
841 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
842 * object for that handle and use that object to match against a given list of
843 * device IDs.
844 *
845 * Return a pointer to the first matching ID on success or %NULL on failure.
846 */
847 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
848 const struct device *dev)
849 {
850 struct acpi_device *adev;
851 acpi_handle handle = ACPI_HANDLE(dev);
852
853 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
854 return NULL;
855
856 return __acpi_match_device(adev, ids);
857 }
858 EXPORT_SYMBOL_GPL(acpi_match_device);
859
860 int acpi_match_device_ids(struct acpi_device *device,
861 const struct acpi_device_id *ids)
862 {
863 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
864 }
865 EXPORT_SYMBOL(acpi_match_device_ids);
866
867 static void acpi_free_power_resources_lists(struct acpi_device *device)
868 {
869 int i;
870
871 if (device->wakeup.flags.valid)
872 acpi_power_resources_list_free(&device->wakeup.resources);
873
874 if (!device->flags.power_manageable)
875 return;
876
877 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
878 struct acpi_device_power_state *ps = &device->power.states[i];
879 acpi_power_resources_list_free(&ps->resources);
880 }
881 }
882
883 static void acpi_device_release(struct device *dev)
884 {
885 struct acpi_device *acpi_dev = to_acpi_device(dev);
886
887 acpi_free_pnp_ids(&acpi_dev->pnp);
888 acpi_free_power_resources_lists(acpi_dev);
889 kfree(acpi_dev);
890 }
891
892 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
893 {
894 struct acpi_device *acpi_dev = to_acpi_device(dev);
895 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
896
897 return acpi_dev->flags.match_driver
898 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
899 }
900
901 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
902 {
903 struct acpi_device *acpi_dev = to_acpi_device(dev);
904 int len;
905
906 if (list_empty(&acpi_dev->pnp.ids))
907 return 0;
908
909 if (add_uevent_var(env, "MODALIAS="))
910 return -ENOMEM;
911 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
912 sizeof(env->buf) - env->buflen);
913 if (len <= 0)
914 return len;
915 env->buflen += len;
916 return 0;
917 }
918
919 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
920 {
921 struct acpi_device *device = data;
922
923 device->driver->ops.notify(device, event);
924 }
925
926 static void acpi_device_notify_fixed(void *data)
927 {
928 struct acpi_device *device = data;
929
930 /* Fixed hardware devices have no handles */
931 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
932 }
933
934 static acpi_status acpi_device_fixed_event(void *data)
935 {
936 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
937 return AE_OK;
938 }
939
940 static int acpi_device_install_notify_handler(struct acpi_device *device)
941 {
942 acpi_status status;
943
944 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
945 status =
946 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
947 acpi_device_fixed_event,
948 device);
949 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
950 status =
951 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
952 acpi_device_fixed_event,
953 device);
954 else
955 status = acpi_install_notify_handler(device->handle,
956 ACPI_DEVICE_NOTIFY,
957 acpi_device_notify,
958 device);
959
960 if (ACPI_FAILURE(status))
961 return -EINVAL;
962 return 0;
963 }
964
965 static void acpi_device_remove_notify_handler(struct acpi_device *device)
966 {
967 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
968 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
969 acpi_device_fixed_event);
970 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
971 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
972 acpi_device_fixed_event);
973 else
974 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
975 acpi_device_notify);
976 }
977
978 static int acpi_device_probe(struct device *dev)
979 {
980 struct acpi_device *acpi_dev = to_acpi_device(dev);
981 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
982 int ret;
983
984 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
985 return -EINVAL;
986
987 if (!acpi_drv->ops.add)
988 return -ENOSYS;
989
990 ret = acpi_drv->ops.add(acpi_dev);
991 if (ret)
992 return ret;
993
994 acpi_dev->driver = acpi_drv;
995 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
996 "Driver [%s] successfully bound to device [%s]\n",
997 acpi_drv->name, acpi_dev->pnp.bus_id));
998
999 if (acpi_drv->ops.notify) {
1000 ret = acpi_device_install_notify_handler(acpi_dev);
1001 if (ret) {
1002 if (acpi_drv->ops.remove)
1003 acpi_drv->ops.remove(acpi_dev);
1004
1005 acpi_dev->driver = NULL;
1006 acpi_dev->driver_data = NULL;
1007 return ret;
1008 }
1009 }
1010
1011 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1012 acpi_drv->name, acpi_dev->pnp.bus_id));
1013 get_device(dev);
1014 return 0;
1015 }
1016
1017 static int acpi_device_remove(struct device * dev)
1018 {
1019 struct acpi_device *acpi_dev = to_acpi_device(dev);
1020 struct acpi_driver *acpi_drv = acpi_dev->driver;
1021
1022 if (acpi_drv) {
1023 if (acpi_drv->ops.notify)
1024 acpi_device_remove_notify_handler(acpi_dev);
1025 if (acpi_drv->ops.remove)
1026 acpi_drv->ops.remove(acpi_dev);
1027 }
1028 acpi_dev->driver = NULL;
1029 acpi_dev->driver_data = NULL;
1030
1031 put_device(dev);
1032 return 0;
1033 }
1034
1035 struct bus_type acpi_bus_type = {
1036 .name = "acpi",
1037 .match = acpi_bus_match,
1038 .probe = acpi_device_probe,
1039 .remove = acpi_device_remove,
1040 .uevent = acpi_device_uevent,
1041 };
1042
1043 static void acpi_device_del(struct acpi_device *device)
1044 {
1045 mutex_lock(&acpi_device_lock);
1046 if (device->parent)
1047 list_del(&device->node);
1048
1049 list_del(&device->wakeup_list);
1050 mutex_unlock(&acpi_device_lock);
1051
1052 acpi_power_add_remove_device(device, false);
1053 acpi_device_remove_files(device);
1054 if (device->remove)
1055 device->remove(device);
1056
1057 device_del(&device->dev);
1058 }
1059
1060 static LIST_HEAD(acpi_device_del_list);
1061 static DEFINE_MUTEX(acpi_device_del_lock);
1062
1063 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1064 {
1065 for (;;) {
1066 struct acpi_device *adev;
1067
1068 mutex_lock(&acpi_device_del_lock);
1069
1070 if (list_empty(&acpi_device_del_list)) {
1071 mutex_unlock(&acpi_device_del_lock);
1072 break;
1073 }
1074 adev = list_first_entry(&acpi_device_del_list,
1075 struct acpi_device, del_list);
1076 list_del(&adev->del_list);
1077
1078 mutex_unlock(&acpi_device_del_lock);
1079
1080 acpi_device_del(adev);
1081 /*
1082 * Drop references to all power resources that might have been
1083 * used by the device.
1084 */
1085 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1086 put_device(&adev->dev);
1087 }
1088 }
1089
1090 /**
1091 * acpi_scan_drop_device - Drop an ACPI device object.
1092 * @handle: Handle of an ACPI namespace node, not used.
1093 * @context: Address of the ACPI device object to drop.
1094 *
1095 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1096 * namespace node the device object pointed to by @context is attached to.
1097 *
1098 * The unregistration is carried out asynchronously to avoid running
1099 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1100 * ensure the correct ordering (the device objects must be unregistered in the
1101 * same order in which the corresponding namespace nodes are deleted).
1102 */
1103 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1104 {
1105 static DECLARE_WORK(work, acpi_device_del_work_fn);
1106 struct acpi_device *adev = context;
1107
1108 mutex_lock(&acpi_device_del_lock);
1109
1110 /*
1111 * Use the ACPI hotplug workqueue which is ordered, so this work item
1112 * won't run after any hotplug work items submitted subsequently. That
1113 * prevents attempts to register device objects identical to those being
1114 * deleted from happening concurrently (such attempts result from
1115 * hotplug events handled via the ACPI hotplug workqueue). It also will
1116 * run after all of the work items submitted previosuly, which helps
1117 * those work items to ensure that they are not accessing stale device
1118 * objects.
1119 */
1120 if (list_empty(&acpi_device_del_list))
1121 acpi_queue_hotplug_work(&work);
1122
1123 list_add_tail(&adev->del_list, &acpi_device_del_list);
1124 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1125 adev->handle = INVALID_ACPI_HANDLE;
1126
1127 mutex_unlock(&acpi_device_del_lock);
1128 }
1129
1130 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1131 void (*callback)(void *))
1132 {
1133 acpi_status status;
1134
1135 if (!device)
1136 return -EINVAL;
1137
1138 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1139 (void **)device, callback);
1140 if (ACPI_FAILURE(status) || !*device) {
1141 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1142 handle));
1143 return -ENODEV;
1144 }
1145 return 0;
1146 }
1147
1148 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1149 {
1150 return acpi_get_device_data(handle, device, NULL);
1151 }
1152 EXPORT_SYMBOL(acpi_bus_get_device);
1153
1154 static void get_acpi_device(void *dev)
1155 {
1156 if (dev)
1157 get_device(&((struct acpi_device *)dev)->dev);
1158 }
1159
1160 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1161 {
1162 struct acpi_device *adev = NULL;
1163
1164 acpi_get_device_data(handle, &adev, get_acpi_device);
1165 return adev;
1166 }
1167
1168 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1169 {
1170 put_device(&adev->dev);
1171 }
1172
1173 int acpi_device_add(struct acpi_device *device,
1174 void (*release)(struct device *))
1175 {
1176 int result;
1177 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1178 int found = 0;
1179
1180 if (device->handle) {
1181 acpi_status status;
1182
1183 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1184 device);
1185 if (ACPI_FAILURE(status)) {
1186 acpi_handle_err(device->handle,
1187 "Unable to attach device data\n");
1188 return -ENODEV;
1189 }
1190 }
1191
1192 /*
1193 * Linkage
1194 * -------
1195 * Link this device to its parent and siblings.
1196 */
1197 INIT_LIST_HEAD(&device->children);
1198 INIT_LIST_HEAD(&device->node);
1199 INIT_LIST_HEAD(&device->wakeup_list);
1200 INIT_LIST_HEAD(&device->physical_node_list);
1201 INIT_LIST_HEAD(&device->del_list);
1202 mutex_init(&device->physical_node_lock);
1203
1204 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1205 if (!new_bus_id) {
1206 pr_err(PREFIX "Memory allocation error\n");
1207 result = -ENOMEM;
1208 goto err_detach;
1209 }
1210
1211 mutex_lock(&acpi_device_lock);
1212 /*
1213 * Find suitable bus_id and instance number in acpi_bus_id_list
1214 * If failed, create one and link it into acpi_bus_id_list
1215 */
1216 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1217 if (!strcmp(acpi_device_bus_id->bus_id,
1218 acpi_device_hid(device))) {
1219 acpi_device_bus_id->instance_no++;
1220 found = 1;
1221 kfree(new_bus_id);
1222 break;
1223 }
1224 }
1225 if (!found) {
1226 acpi_device_bus_id = new_bus_id;
1227 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1228 acpi_device_bus_id->instance_no = 0;
1229 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1230 }
1231 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1232
1233 if (device->parent)
1234 list_add_tail(&device->node, &device->parent->children);
1235
1236 if (device->wakeup.flags.valid)
1237 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1238 mutex_unlock(&acpi_device_lock);
1239
1240 if (device->parent)
1241 device->dev.parent = &device->parent->dev;
1242 device->dev.bus = &acpi_bus_type;
1243 device->dev.release = release;
1244 result = device_add(&device->dev);
1245 if (result) {
1246 dev_err(&device->dev, "Error registering device\n");
1247 goto err;
1248 }
1249
1250 result = acpi_device_setup_files(device);
1251 if (result)
1252 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1253 dev_name(&device->dev));
1254
1255 return 0;
1256
1257 err:
1258 mutex_lock(&acpi_device_lock);
1259 if (device->parent)
1260 list_del(&device->node);
1261 list_del(&device->wakeup_list);
1262 mutex_unlock(&acpi_device_lock);
1263
1264 err_detach:
1265 acpi_detach_data(device->handle, acpi_scan_drop_device);
1266 return result;
1267 }
1268
1269 /* --------------------------------------------------------------------------
1270 Driver Management
1271 -------------------------------------------------------------------------- */
1272 /**
1273 * acpi_bus_register_driver - register a driver with the ACPI bus
1274 * @driver: driver being registered
1275 *
1276 * Registers a driver with the ACPI bus. Searches the namespace for all
1277 * devices that match the driver's criteria and binds. Returns zero for
1278 * success or a negative error status for failure.
1279 */
1280 int acpi_bus_register_driver(struct acpi_driver *driver)
1281 {
1282 int ret;
1283
1284 if (acpi_disabled)
1285 return -ENODEV;
1286 driver->drv.name = driver->name;
1287 driver->drv.bus = &acpi_bus_type;
1288 driver->drv.owner = driver->owner;
1289
1290 ret = driver_register(&driver->drv);
1291 return ret;
1292 }
1293
1294 EXPORT_SYMBOL(acpi_bus_register_driver);
1295
1296 /**
1297 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1298 * @driver: driver to unregister
1299 *
1300 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1301 * devices that match the driver's criteria and unbinds.
1302 */
1303 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1304 {
1305 driver_unregister(&driver->drv);
1306 }
1307
1308 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1309
1310 /* --------------------------------------------------------------------------
1311 Device Enumeration
1312 -------------------------------------------------------------------------- */
1313 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1314 {
1315 struct acpi_device *device = NULL;
1316 acpi_status status;
1317
1318 /*
1319 * Fixed hardware devices do not appear in the namespace and do not
1320 * have handles, but we fabricate acpi_devices for them, so we have
1321 * to deal with them specially.
1322 */
1323 if (!handle)
1324 return acpi_root;
1325
1326 do {
1327 status = acpi_get_parent(handle, &handle);
1328 if (ACPI_FAILURE(status))
1329 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1330 } while (acpi_bus_get_device(handle, &device));
1331 return device;
1332 }
1333
1334 acpi_status
1335 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1336 {
1337 acpi_status status;
1338 acpi_handle tmp;
1339 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1340 union acpi_object *obj;
1341
1342 status = acpi_get_handle(handle, "_EJD", &tmp);
1343 if (ACPI_FAILURE(status))
1344 return status;
1345
1346 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1347 if (ACPI_SUCCESS(status)) {
1348 obj = buffer.pointer;
1349 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1350 ejd);
1351 kfree(buffer.pointer);
1352 }
1353 return status;
1354 }
1355 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1356
1357 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1358 struct acpi_device_wakeup *wakeup)
1359 {
1360 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1361 union acpi_object *package = NULL;
1362 union acpi_object *element = NULL;
1363 acpi_status status;
1364 int err = -ENODATA;
1365
1366 if (!wakeup)
1367 return -EINVAL;
1368
1369 INIT_LIST_HEAD(&wakeup->resources);
1370
1371 /* _PRW */
1372 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1373 if (ACPI_FAILURE(status)) {
1374 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1375 return err;
1376 }
1377
1378 package = (union acpi_object *)buffer.pointer;
1379
1380 if (!package || package->package.count < 2)
1381 goto out;
1382
1383 element = &(package->package.elements[0]);
1384 if (!element)
1385 goto out;
1386
1387 if (element->type == ACPI_TYPE_PACKAGE) {
1388 if ((element->package.count < 2) ||
1389 (element->package.elements[0].type !=
1390 ACPI_TYPE_LOCAL_REFERENCE)
1391 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1392 goto out;
1393
1394 wakeup->gpe_device =
1395 element->package.elements[0].reference.handle;
1396 wakeup->gpe_number =
1397 (u32) element->package.elements[1].integer.value;
1398 } else if (element->type == ACPI_TYPE_INTEGER) {
1399 wakeup->gpe_device = NULL;
1400 wakeup->gpe_number = element->integer.value;
1401 } else {
1402 goto out;
1403 }
1404
1405 element = &(package->package.elements[1]);
1406 if (element->type != ACPI_TYPE_INTEGER)
1407 goto out;
1408
1409 wakeup->sleep_state = element->integer.value;
1410
1411 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1412 if (err)
1413 goto out;
1414
1415 if (!list_empty(&wakeup->resources)) {
1416 int sleep_state;
1417
1418 err = acpi_power_wakeup_list_init(&wakeup->resources,
1419 &sleep_state);
1420 if (err) {
1421 acpi_handle_warn(handle, "Retrieving current states "
1422 "of wakeup power resources failed\n");
1423 acpi_power_resources_list_free(&wakeup->resources);
1424 goto out;
1425 }
1426 if (sleep_state < wakeup->sleep_state) {
1427 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1428 "(S%d) by S%d from power resources\n",
1429 (int)wakeup->sleep_state, sleep_state);
1430 wakeup->sleep_state = sleep_state;
1431 }
1432 }
1433
1434 out:
1435 kfree(buffer.pointer);
1436 return err;
1437 }
1438
1439 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1440 {
1441 struct acpi_device_id button_device_ids[] = {
1442 {"PNP0C0C", 0},
1443 {"PNP0C0D", 0},
1444 {"PNP0C0E", 0},
1445 {"", 0},
1446 };
1447 struct acpi_device_wakeup *wakeup = &device->wakeup;
1448 acpi_status status;
1449 acpi_event_status event_status;
1450
1451 wakeup->flags.notifier_present = 0;
1452
1453 /* Power button, Lid switch always enable wakeup */
1454 if (!acpi_match_device_ids(device, button_device_ids)) {
1455 wakeup->flags.run_wake = 1;
1456 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1457 /* Do not use Lid/sleep button for S5 wakeup */
1458 if (wakeup->sleep_state == ACPI_STATE_S5)
1459 wakeup->sleep_state = ACPI_STATE_S4;
1460 }
1461 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1462 device_set_wakeup_capable(&device->dev, true);
1463 return;
1464 }
1465
1466 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1467 wakeup->gpe_number);
1468 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1469 &event_status);
1470 if (ACPI_FAILURE(status))
1471 return;
1472
1473 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1474 }
1475
1476 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1477 {
1478 int err;
1479
1480 /* Presence of _PRW indicates wake capable */
1481 if (!acpi_has_method(device->handle, "_PRW"))
1482 return;
1483
1484 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1485 &device->wakeup);
1486 if (err) {
1487 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1488 return;
1489 }
1490
1491 device->wakeup.flags.valid = 1;
1492 device->wakeup.prepare_count = 0;
1493 acpi_wakeup_gpe_init(device);
1494 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1495 * system for the ACPI device with the _PRW object.
1496 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1497 * So it is necessary to call _DSW object first. Only when it is not
1498 * present will the _PSW object used.
1499 */
1500 err = acpi_device_sleep_wake(device, 0, 0, 0);
1501 if (err)
1502 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1503 "error in _DSW or _PSW evaluation\n"));
1504 }
1505
1506 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1507 {
1508 struct acpi_device_power_state *ps = &device->power.states[state];
1509 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1510 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1511 acpi_status status;
1512
1513 INIT_LIST_HEAD(&ps->resources);
1514
1515 /* Evaluate "_PRx" to get referenced power resources */
1516 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1517 if (ACPI_SUCCESS(status)) {
1518 union acpi_object *package = buffer.pointer;
1519
1520 if (buffer.length && package
1521 && package->type == ACPI_TYPE_PACKAGE
1522 && package->package.count) {
1523 int err = acpi_extract_power_resources(package, 0,
1524 &ps->resources);
1525 if (!err)
1526 device->power.flags.power_resources = 1;
1527 }
1528 ACPI_FREE(buffer.pointer);
1529 }
1530
1531 /* Evaluate "_PSx" to see if we can do explicit sets */
1532 pathname[2] = 'S';
1533 if (acpi_has_method(device->handle, pathname))
1534 ps->flags.explicit_set = 1;
1535
1536 /*
1537 * State is valid if there are means to put the device into it.
1538 * D3hot is only valid if _PR3 present.
1539 */
1540 if (!list_empty(&ps->resources)
1541 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1542 ps->flags.valid = 1;
1543 ps->flags.os_accessible = 1;
1544 }
1545
1546 ps->power = -1; /* Unknown - driver assigned */
1547 ps->latency = -1; /* Unknown - driver assigned */
1548 }
1549
1550 static void acpi_bus_get_power_flags(struct acpi_device *device)
1551 {
1552 u32 i;
1553
1554 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1555 if (!acpi_has_method(device->handle, "_PS0") &&
1556 !acpi_has_method(device->handle, "_PR0"))
1557 return;
1558
1559 device->flags.power_manageable = 1;
1560
1561 /*
1562 * Power Management Flags
1563 */
1564 if (acpi_has_method(device->handle, "_PSC"))
1565 device->power.flags.explicit_get = 1;
1566
1567 if (acpi_has_method(device->handle, "_IRC"))
1568 device->power.flags.inrush_current = 1;
1569
1570 if (acpi_has_method(device->handle, "_DSW"))
1571 device->power.flags.dsw_present = 1;
1572
1573 /*
1574 * Enumerate supported power management states
1575 */
1576 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1577 acpi_bus_init_power_state(device, i);
1578
1579 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1580
1581 /* Set defaults for D0 and D3 states (always valid) */
1582 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1583 device->power.states[ACPI_STATE_D0].power = 100;
1584 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1585 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1586
1587 /* Set D3cold's explicit_set flag if _PS3 exists. */
1588 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1589 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1590
1591 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1592 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1593 device->power.flags.power_resources)
1594 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1595
1596 if (acpi_bus_init_power(device)) {
1597 acpi_free_power_resources_lists(device);
1598 device->flags.power_manageable = 0;
1599 }
1600 }
1601
1602 static void acpi_bus_get_flags(struct acpi_device *device)
1603 {
1604 /* Presence of _STA indicates 'dynamic_status' */
1605 if (acpi_has_method(device->handle, "_STA"))
1606 device->flags.dynamic_status = 1;
1607
1608 /* Presence of _RMV indicates 'removable' */
1609 if (acpi_has_method(device->handle, "_RMV"))
1610 device->flags.removable = 1;
1611
1612 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1613 if (acpi_has_method(device->handle, "_EJD") ||
1614 acpi_has_method(device->handle, "_EJ0"))
1615 device->flags.ejectable = 1;
1616 }
1617
1618 static void acpi_device_get_busid(struct acpi_device *device)
1619 {
1620 char bus_id[5] = { '?', 0 };
1621 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1622 int i = 0;
1623
1624 /*
1625 * Bus ID
1626 * ------
1627 * The device's Bus ID is simply the object name.
1628 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1629 */
1630 if (ACPI_IS_ROOT_DEVICE(device)) {
1631 strcpy(device->pnp.bus_id, "ACPI");
1632 return;
1633 }
1634
1635 switch (device->device_type) {
1636 case ACPI_BUS_TYPE_POWER_BUTTON:
1637 strcpy(device->pnp.bus_id, "PWRF");
1638 break;
1639 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1640 strcpy(device->pnp.bus_id, "SLPF");
1641 break;
1642 default:
1643 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1644 /* Clean up trailing underscores (if any) */
1645 for (i = 3; i > 1; i--) {
1646 if (bus_id[i] == '_')
1647 bus_id[i] = '\0';
1648 else
1649 break;
1650 }
1651 strcpy(device->pnp.bus_id, bus_id);
1652 break;
1653 }
1654 }
1655
1656 /*
1657 * acpi_ata_match - see if an acpi object is an ATA device
1658 *
1659 * If an acpi object has one of the ACPI ATA methods defined,
1660 * then we can safely call it an ATA device.
1661 */
1662 bool acpi_ata_match(acpi_handle handle)
1663 {
1664 return acpi_has_method(handle, "_GTF") ||
1665 acpi_has_method(handle, "_GTM") ||
1666 acpi_has_method(handle, "_STM") ||
1667 acpi_has_method(handle, "_SDD");
1668 }
1669
1670 /*
1671 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1672 *
1673 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1674 * then we can safely call it an ejectable drive bay
1675 */
1676 bool acpi_bay_match(acpi_handle handle)
1677 {
1678 acpi_handle phandle;
1679
1680 if (!acpi_has_method(handle, "_EJ0"))
1681 return false;
1682 if (acpi_ata_match(handle))
1683 return true;
1684 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1685 return false;
1686
1687 return acpi_ata_match(phandle);
1688 }
1689
1690 bool acpi_device_is_battery(struct acpi_device *adev)
1691 {
1692 struct acpi_hardware_id *hwid;
1693
1694 list_for_each_entry(hwid, &adev->pnp.ids, list)
1695 if (!strcmp("PNP0C0A", hwid->id))
1696 return true;
1697
1698 return false;
1699 }
1700
1701 static bool is_ejectable_bay(struct acpi_device *adev)
1702 {
1703 acpi_handle handle = adev->handle;
1704
1705 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1706 return true;
1707
1708 return acpi_bay_match(handle);
1709 }
1710
1711 /*
1712 * acpi_dock_match - see if an acpi object has a _DCK method
1713 */
1714 bool acpi_dock_match(acpi_handle handle)
1715 {
1716 return acpi_has_method(handle, "_DCK");
1717 }
1718
1719 const char *acpi_device_hid(struct acpi_device *device)
1720 {
1721 struct acpi_hardware_id *hid;
1722
1723 if (list_empty(&device->pnp.ids))
1724 return dummy_hid;
1725
1726 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1727 return hid->id;
1728 }
1729 EXPORT_SYMBOL(acpi_device_hid);
1730
1731 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1732 {
1733 struct acpi_hardware_id *id;
1734
1735 id = kmalloc(sizeof(*id), GFP_KERNEL);
1736 if (!id)
1737 return;
1738
1739 id->id = kstrdup(dev_id, GFP_KERNEL);
1740 if (!id->id) {
1741 kfree(id);
1742 return;
1743 }
1744
1745 list_add_tail(&id->list, &pnp->ids);
1746 pnp->type.hardware_id = 1;
1747 }
1748
1749 /*
1750 * Old IBM workstations have a DSDT bug wherein the SMBus object
1751 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1752 * prefix. Work around this.
1753 */
1754 static bool acpi_ibm_smbus_match(acpi_handle handle)
1755 {
1756 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1757 struct acpi_buffer path = { sizeof(node_name), node_name };
1758
1759 if (!dmi_name_in_vendors("IBM"))
1760 return false;
1761
1762 /* Look for SMBS object */
1763 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1764 strcmp("SMBS", path.pointer))
1765 return false;
1766
1767 /* Does it have the necessary (but misnamed) methods? */
1768 if (acpi_has_method(handle, "SBI") &&
1769 acpi_has_method(handle, "SBR") &&
1770 acpi_has_method(handle, "SBW"))
1771 return true;
1772
1773 return false;
1774 }
1775
1776 static bool acpi_object_is_system_bus(acpi_handle handle)
1777 {
1778 acpi_handle tmp;
1779
1780 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1781 tmp == handle)
1782 return true;
1783 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1784 tmp == handle)
1785 return true;
1786
1787 return false;
1788 }
1789
1790 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1791 int device_type)
1792 {
1793 acpi_status status;
1794 struct acpi_device_info *info;
1795 struct acpi_pnp_device_id_list *cid_list;
1796 int i;
1797
1798 switch (device_type) {
1799 case ACPI_BUS_TYPE_DEVICE:
1800 if (handle == ACPI_ROOT_OBJECT) {
1801 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1802 break;
1803 }
1804
1805 status = acpi_get_object_info(handle, &info);
1806 if (ACPI_FAILURE(status)) {
1807 pr_err(PREFIX "%s: Error reading device info\n",
1808 __func__);
1809 return;
1810 }
1811
1812 if (info->valid & ACPI_VALID_HID) {
1813 acpi_add_id(pnp, info->hardware_id.string);
1814 pnp->type.platform_id = 1;
1815 }
1816 if (info->valid & ACPI_VALID_CID) {
1817 cid_list = &info->compatible_id_list;
1818 for (i = 0; i < cid_list->count; i++)
1819 acpi_add_id(pnp, cid_list->ids[i].string);
1820 }
1821 if (info->valid & ACPI_VALID_ADR) {
1822 pnp->bus_address = info->address;
1823 pnp->type.bus_address = 1;
1824 }
1825 if (info->valid & ACPI_VALID_UID)
1826 pnp->unique_id = kstrdup(info->unique_id.string,
1827 GFP_KERNEL);
1828
1829 kfree(info);
1830
1831 /*
1832 * Some devices don't reliably have _HIDs & _CIDs, so add
1833 * synthetic HIDs to make sure drivers can find them.
1834 */
1835 if (acpi_is_video_device(handle))
1836 acpi_add_id(pnp, ACPI_VIDEO_HID);
1837 else if (acpi_bay_match(handle))
1838 acpi_add_id(pnp, ACPI_BAY_HID);
1839 else if (acpi_dock_match(handle))
1840 acpi_add_id(pnp, ACPI_DOCK_HID);
1841 else if (acpi_ibm_smbus_match(handle))
1842 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1843 else if (list_empty(&pnp->ids) &&
1844 acpi_object_is_system_bus(handle)) {
1845 /* \_SB, \_TZ, LNXSYBUS */
1846 acpi_add_id(pnp, ACPI_BUS_HID);
1847 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1848 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1849 }
1850
1851 break;
1852 case ACPI_BUS_TYPE_POWER:
1853 acpi_add_id(pnp, ACPI_POWER_HID);
1854 break;
1855 case ACPI_BUS_TYPE_PROCESSOR:
1856 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1857 break;
1858 case ACPI_BUS_TYPE_THERMAL:
1859 acpi_add_id(pnp, ACPI_THERMAL_HID);
1860 break;
1861 case ACPI_BUS_TYPE_POWER_BUTTON:
1862 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1863 break;
1864 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1865 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1866 break;
1867 }
1868 }
1869
1870 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1871 {
1872 struct acpi_hardware_id *id, *tmp;
1873
1874 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1875 kfree(id->id);
1876 kfree(id);
1877 }
1878 kfree(pnp->unique_id);
1879 }
1880
1881 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1882 int type, unsigned long long sta)
1883 {
1884 INIT_LIST_HEAD(&device->pnp.ids);
1885 device->device_type = type;
1886 device->handle = handle;
1887 device->parent = acpi_bus_get_parent(handle);
1888 acpi_set_device_status(device, sta);
1889 acpi_device_get_busid(device);
1890 acpi_set_pnp_ids(handle, &device->pnp, type);
1891 acpi_bus_get_flags(device);
1892 device->flags.match_driver = false;
1893 device->flags.initialized = true;
1894 device->flags.visited = false;
1895 device_initialize(&device->dev);
1896 dev_set_uevent_suppress(&device->dev, true);
1897 }
1898
1899 void acpi_device_add_finalize(struct acpi_device *device)
1900 {
1901 dev_set_uevent_suppress(&device->dev, false);
1902 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1903 }
1904
1905 static int acpi_add_single_object(struct acpi_device **child,
1906 acpi_handle handle, int type,
1907 unsigned long long sta)
1908 {
1909 int result;
1910 struct acpi_device *device;
1911 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1912
1913 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1914 if (!device) {
1915 printk(KERN_ERR PREFIX "Memory allocation error\n");
1916 return -ENOMEM;
1917 }
1918
1919 acpi_init_device_object(device, handle, type, sta);
1920 acpi_bus_get_power_flags(device);
1921 acpi_bus_get_wakeup_device_flags(device);
1922
1923 result = acpi_device_add(device, acpi_device_release);
1924 if (result) {
1925 acpi_device_release(&device->dev);
1926 return result;
1927 }
1928
1929 acpi_power_add_remove_device(device, true);
1930 acpi_device_add_finalize(device);
1931 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1932 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1933 dev_name(&device->dev), (char *) buffer.pointer,
1934 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1935 kfree(buffer.pointer);
1936 *child = device;
1937 return 0;
1938 }
1939
1940 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1941 unsigned long long *sta)
1942 {
1943 acpi_status status;
1944 acpi_object_type acpi_type;
1945
1946 status = acpi_get_type(handle, &acpi_type);
1947 if (ACPI_FAILURE(status))
1948 return -ENODEV;
1949
1950 switch (acpi_type) {
1951 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1952 case ACPI_TYPE_DEVICE:
1953 *type = ACPI_BUS_TYPE_DEVICE;
1954 status = acpi_bus_get_status_handle(handle, sta);
1955 if (ACPI_FAILURE(status))
1956 return -ENODEV;
1957 break;
1958 case ACPI_TYPE_PROCESSOR:
1959 *type = ACPI_BUS_TYPE_PROCESSOR;
1960 status = acpi_bus_get_status_handle(handle, sta);
1961 if (ACPI_FAILURE(status))
1962 return -ENODEV;
1963 break;
1964 case ACPI_TYPE_THERMAL:
1965 *type = ACPI_BUS_TYPE_THERMAL;
1966 *sta = ACPI_STA_DEFAULT;
1967 break;
1968 case ACPI_TYPE_POWER:
1969 *type = ACPI_BUS_TYPE_POWER;
1970 *sta = ACPI_STA_DEFAULT;
1971 break;
1972 default:
1973 return -ENODEV;
1974 }
1975
1976 return 0;
1977 }
1978
1979 bool acpi_device_is_present(struct acpi_device *adev)
1980 {
1981 if (adev->status.present || adev->status.functional)
1982 return true;
1983
1984 adev->flags.initialized = false;
1985 return false;
1986 }
1987
1988 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1989 char *idstr,
1990 const struct acpi_device_id **matchid)
1991 {
1992 const struct acpi_device_id *devid;
1993
1994 if (handler->match)
1995 return handler->match(idstr, matchid);
1996
1997 for (devid = handler->ids; devid->id[0]; devid++)
1998 if (!strcmp((char *)devid->id, idstr)) {
1999 if (matchid)
2000 *matchid = devid;
2001
2002 return true;
2003 }
2004
2005 return false;
2006 }
2007
2008 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2009 const struct acpi_device_id **matchid)
2010 {
2011 struct acpi_scan_handler *handler;
2012
2013 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2014 if (acpi_scan_handler_matching(handler, idstr, matchid))
2015 return handler;
2016
2017 return NULL;
2018 }
2019
2020 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2021 {
2022 if (!!hotplug->enabled == !!val)
2023 return;
2024
2025 mutex_lock(&acpi_scan_lock);
2026
2027 hotplug->enabled = val;
2028
2029 mutex_unlock(&acpi_scan_lock);
2030 }
2031
2032 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2033 {
2034 struct acpi_hardware_id *hwid;
2035
2036 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2037 acpi_dock_add(adev);
2038 return;
2039 }
2040 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2041 struct acpi_scan_handler *handler;
2042
2043 handler = acpi_scan_match_handler(hwid->id, NULL);
2044 if (handler) {
2045 adev->flags.hotplug_notify = true;
2046 break;
2047 }
2048 }
2049 }
2050
2051 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2052 void *not_used, void **return_value)
2053 {
2054 struct acpi_device *device = NULL;
2055 int type;
2056 unsigned long long sta;
2057 int result;
2058
2059 acpi_bus_get_device(handle, &device);
2060 if (device)
2061 goto out;
2062
2063 result = acpi_bus_type_and_status(handle, &type, &sta);
2064 if (result)
2065 return AE_OK;
2066
2067 if (type == ACPI_BUS_TYPE_POWER) {
2068 acpi_add_power_resource(handle);
2069 return AE_OK;
2070 }
2071
2072 acpi_add_single_object(&device, handle, type, sta);
2073 if (!device)
2074 return AE_CTRL_DEPTH;
2075
2076 acpi_scan_init_hotplug(device);
2077
2078 out:
2079 if (!*return_value)
2080 *return_value = device;
2081
2082 return AE_OK;
2083 }
2084
2085 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2086 {
2087 bool *is_spi_i2c_slave_p = data;
2088
2089 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2090 return 1;
2091
2092 /*
2093 * devices that are connected to UART still need to be enumerated to
2094 * platform bus
2095 */
2096 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2097 *is_spi_i2c_slave_p = true;
2098
2099 /* no need to do more checking */
2100 return -1;
2101 }
2102
2103 static void acpi_default_enumeration(struct acpi_device *device)
2104 {
2105 struct list_head resource_list;
2106 bool is_spi_i2c_slave = false;
2107
2108 if (!device->pnp.type.platform_id || device->handler)
2109 return;
2110
2111 /*
2112 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2113 * respective parents.
2114 */
2115 INIT_LIST_HEAD(&resource_list);
2116 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2117 &is_spi_i2c_slave);
2118 acpi_dev_free_resource_list(&resource_list);
2119 if (!is_spi_i2c_slave)
2120 acpi_create_platform_device(device);
2121 }
2122
2123 static int acpi_scan_attach_handler(struct acpi_device *device)
2124 {
2125 struct acpi_hardware_id *hwid;
2126 int ret = 0;
2127
2128 list_for_each_entry(hwid, &device->pnp.ids, list) {
2129 const struct acpi_device_id *devid;
2130 struct acpi_scan_handler *handler;
2131
2132 handler = acpi_scan_match_handler(hwid->id, &devid);
2133 if (handler) {
2134 if (!handler->attach) {
2135 device->pnp.type.platform_id = 0;
2136 continue;
2137 }
2138 device->handler = handler;
2139 ret = handler->attach(device, devid);
2140 if (ret > 0)
2141 break;
2142
2143 device->handler = NULL;
2144 if (ret < 0)
2145 break;
2146 }
2147 }
2148 if (!ret)
2149 acpi_default_enumeration(device);
2150
2151 return ret;
2152 }
2153
2154 static void acpi_bus_attach(struct acpi_device *device)
2155 {
2156 struct acpi_device *child;
2157 acpi_handle ejd;
2158 int ret;
2159
2160 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2161 register_dock_dependent_device(device, ejd);
2162
2163 acpi_bus_get_status(device);
2164 /* Skip devices that are not present. */
2165 if (!acpi_device_is_present(device)) {
2166 device->flags.visited = false;
2167 return;
2168 }
2169 if (device->handler)
2170 goto ok;
2171
2172 if (!device->flags.initialized) {
2173 acpi_bus_update_power(device, NULL);
2174 device->flags.initialized = true;
2175 }
2176 device->flags.visited = false;
2177 ret = acpi_scan_attach_handler(device);
2178 if (ret < 0)
2179 return;
2180
2181 device->flags.match_driver = true;
2182 if (!ret) {
2183 ret = device_attach(&device->dev);
2184 if (ret < 0)
2185 return;
2186 }
2187 device->flags.visited = true;
2188
2189 ok:
2190 list_for_each_entry(child, &device->children, node)
2191 acpi_bus_attach(child);
2192
2193 if (device->handler && device->handler->hotplug.notify_online)
2194 device->handler->hotplug.notify_online(device);
2195 }
2196
2197 /**
2198 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2199 * @handle: Root of the namespace scope to scan.
2200 *
2201 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2202 * found devices.
2203 *
2204 * If no devices were found, -ENODEV is returned, but it does not mean that
2205 * there has been a real error. There just have been no suitable ACPI objects
2206 * in the table trunk from which the kernel could create a device and add an
2207 * appropriate driver.
2208 *
2209 * Must be called under acpi_scan_lock.
2210 */
2211 int acpi_bus_scan(acpi_handle handle)
2212 {
2213 void *device = NULL;
2214
2215 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2216 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2217 acpi_bus_check_add, NULL, NULL, &device);
2218
2219 if (device) {
2220 acpi_bus_attach(device);
2221 return 0;
2222 }
2223 return -ENODEV;
2224 }
2225 EXPORT_SYMBOL(acpi_bus_scan);
2226
2227 /**
2228 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2229 * @adev: Root of the ACPI namespace scope to walk.
2230 *
2231 * Must be called under acpi_scan_lock.
2232 */
2233 void acpi_bus_trim(struct acpi_device *adev)
2234 {
2235 struct acpi_scan_handler *handler = adev->handler;
2236 struct acpi_device *child;
2237
2238 list_for_each_entry_reverse(child, &adev->children, node)
2239 acpi_bus_trim(child);
2240
2241 adev->flags.match_driver = false;
2242 if (handler) {
2243 if (handler->detach)
2244 handler->detach(adev);
2245
2246 adev->handler = NULL;
2247 } else {
2248 device_release_driver(&adev->dev);
2249 }
2250 /*
2251 * Most likely, the device is going away, so put it into D3cold before
2252 * that.
2253 */
2254 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2255 adev->flags.initialized = false;
2256 adev->flags.visited = false;
2257 }
2258 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2259
2260 static int acpi_bus_scan_fixed(void)
2261 {
2262 int result = 0;
2263
2264 /*
2265 * Enumerate all fixed-feature devices.
2266 */
2267 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2268 struct acpi_device *device = NULL;
2269
2270 result = acpi_add_single_object(&device, NULL,
2271 ACPI_BUS_TYPE_POWER_BUTTON,
2272 ACPI_STA_DEFAULT);
2273 if (result)
2274 return result;
2275
2276 device->flags.match_driver = true;
2277 result = device_attach(&device->dev);
2278 if (result < 0)
2279 return result;
2280
2281 device_init_wakeup(&device->dev, true);
2282 }
2283
2284 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2285 struct acpi_device *device = NULL;
2286
2287 result = acpi_add_single_object(&device, NULL,
2288 ACPI_BUS_TYPE_SLEEP_BUTTON,
2289 ACPI_STA_DEFAULT);
2290 if (result)
2291 return result;
2292
2293 device->flags.match_driver = true;
2294 result = device_attach(&device->dev);
2295 }
2296
2297 return result < 0 ? result : 0;
2298 }
2299
2300 int __init acpi_scan_init(void)
2301 {
2302 int result;
2303
2304 result = bus_register(&acpi_bus_type);
2305 if (result) {
2306 /* We don't want to quit even if we failed to add suspend/resume */
2307 printk(KERN_ERR PREFIX "Could not register bus type\n");
2308 }
2309
2310 acpi_pci_root_init();
2311 acpi_pci_link_init();
2312 acpi_processor_init();
2313 acpi_lpss_init();
2314 acpi_cmos_rtc_init();
2315 acpi_container_init();
2316 acpi_memory_hotplug_init();
2317 acpi_pnp_init();
2318
2319 mutex_lock(&acpi_scan_lock);
2320 /*
2321 * Enumerate devices in the ACPI namespace.
2322 */
2323 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2324 if (result)
2325 goto out;
2326
2327 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2328 if (result)
2329 goto out;
2330
2331 /* Fixed feature devices do not exist on HW-reduced platform */
2332 if (!acpi_gbl_reduced_hardware) {
2333 result = acpi_bus_scan_fixed();
2334 if (result) {
2335 acpi_detach_data(acpi_root->handle,
2336 acpi_scan_drop_device);
2337 acpi_device_del(acpi_root);
2338 put_device(&acpi_root->dev);
2339 goto out;
2340 }
2341 }
2342
2343 acpi_update_all_gpes();
2344
2345 out:
2346 mutex_unlock(&acpi_scan_lock);
2347 return result;
2348 }
Linux kernel - Deliverables
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