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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / acpi / scan.c
blob57b053f424d13e23ef2dd4b43a191c0d9dda09da
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
45 struct acpi_device_bus_id{
46 char bus_id[15];
47 unsigned int instance_no;
48 struct list_head node;
49 };
50
51 void acpi_scan_lock_acquire(void)
52 {
53 mutex_lock(&acpi_scan_lock);
54 }
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
56
57 void acpi_scan_lock_release(void)
58 {
59 mutex_unlock(&acpi_scan_lock);
60 }
61 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
62
63 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
64 {
65 if (!handler || !handler->attach)
66 return -EINVAL;
67
68 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
69 return 0;
70 }
71
72 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
73 const char *hotplug_profile_name)
74 {
75 int error;
76
77 error = acpi_scan_add_handler(handler);
78 if (error)
79 return error;
80
81 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
82 return 0;
83 }
84
85 /*
86 * Creates hid/cid(s) string needed for modalias and uevent
87 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
88 * char *modalias: "acpi:IBM0001:ACPI0001"
89 * Return: 0: no _HID and no _CID
90 * -EINVAL: output error
91 * -ENOMEM: output is truncated
92 */
93 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
94 int size)
95 {
96 int len;
97 int count;
98 struct acpi_hardware_id *id;
99
100 if (list_empty(&acpi_dev->pnp.ids))
101 return 0;
102
103 len = snprintf(modalias, size, "acpi:");
104 size -= len;
105
106 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
107 count = snprintf(&modalias[len], size, "%s:", id->id);
108 if (count < 0)
109 return EINVAL;
110 if (count >= size)
111 return -ENOMEM;
112 len += count;
113 size -= count;
114 }
115
116 modalias[len] = '\0';
117 return len;
118 }
119
120 /*
121 * Creates uevent modalias field for ACPI enumerated devices.
122 * Because the other buses does not support ACPI HIDs & CIDs.
123 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
124 * "acpi:IBM0001:ACPI0001"
125 */
126 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
127 {
128 struct acpi_device *acpi_dev;
129 int len;
130
131 acpi_dev = ACPI_COMPANION(dev);
132 if (!acpi_dev)
133 return -ENODEV;
134
135 /* Fall back to bus specific way of modalias exporting */
136 if (list_empty(&acpi_dev->pnp.ids))
137 return -ENODEV;
138
139 if (add_uevent_var(env, "MODALIAS="))
140 return -ENOMEM;
141 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
142 sizeof(env->buf) - env->buflen);
143 if (len <= 0)
144 return len;
145 env->buflen += len;
146 return 0;
147 }
148 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
149
150 /*
151 * Creates modalias sysfs attribute for ACPI enumerated devices.
152 * Because the other buses does not support ACPI HIDs & CIDs.
153 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
154 * "acpi:IBM0001:ACPI0001"
155 */
156 int acpi_device_modalias(struct device *dev, char *buf, int size)
157 {
158 struct acpi_device *acpi_dev;
159 int len;
160
161 acpi_dev = ACPI_COMPANION(dev);
162 if (!acpi_dev)
163 return -ENODEV;
164
165 /* Fall back to bus specific way of modalias exporting */
166 if (list_empty(&acpi_dev->pnp.ids))
167 return -ENODEV;
168
169 len = create_modalias(acpi_dev, buf, size -1);
170 if (len <= 0)
171 return len;
172 buf[len++] = '\n';
173 return len;
174 }
175 EXPORT_SYMBOL_GPL(acpi_device_modalias);
176
177 static ssize_t
178 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
179 struct acpi_device *acpi_dev = to_acpi_device(dev);
180 int len;
181
182 len = create_modalias(acpi_dev, buf, 1024);
183 if (len <= 0)
184 return len;
185 buf[len++] = '\n';
186 return len;
187 }
188 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
189
190 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
191 {
192 struct acpi_device_physical_node *pn;
193 bool offline = true;
194
195 mutex_lock(&adev->physical_node_lock);
196
197 list_for_each_entry(pn, &adev->physical_node_list, node)
198 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
199 if (uevent)
200 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
201
202 offline = false;
203 break;
204 }
205
206 mutex_unlock(&adev->physical_node_lock);
207 return offline;
208 }
209
210 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
211 void **ret_p)
212 {
213 struct acpi_device *device = NULL;
214 struct acpi_device_physical_node *pn;
215 bool second_pass = (bool)data;
216 acpi_status status = AE_OK;
217
218 if (acpi_bus_get_device(handle, &device))
219 return AE_OK;
220
221 if (device->handler && !device->handler->hotplug.enabled) {
222 *ret_p = &device->dev;
223 return AE_SUPPORT;
224 }
225
226 mutex_lock(&device->physical_node_lock);
227
228 list_for_each_entry(pn, &device->physical_node_list, node) {
229 int ret;
230
231 if (second_pass) {
232 /* Skip devices offlined by the first pass. */
233 if (pn->put_online)
234 continue;
235 } else {
236 pn->put_online = false;
237 }
238 ret = device_offline(pn->dev);
239 if (acpi_force_hot_remove)
240 continue;
241
242 if (ret >= 0) {
243 pn->put_online = !ret;
244 } else {
245 *ret_p = pn->dev;
246 if (second_pass) {
247 status = AE_ERROR;
248 break;
249 }
250 }
251 }
252
253 mutex_unlock(&device->physical_node_lock);
254
255 return status;
256 }
257
258 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
259 void **ret_p)
260 {
261 struct acpi_device *device = NULL;
262 struct acpi_device_physical_node *pn;
263
264 if (acpi_bus_get_device(handle, &device))
265 return AE_OK;
266
267 mutex_lock(&device->physical_node_lock);
268
269 list_for_each_entry(pn, &device->physical_node_list, node)
270 if (pn->put_online) {
271 device_online(pn->dev);
272 pn->put_online = false;
273 }
274
275 mutex_unlock(&device->physical_node_lock);
276
277 return AE_OK;
278 }
279
280 static int acpi_scan_try_to_offline(struct acpi_device *device)
281 {
282 acpi_handle handle = device->handle;
283 struct device *errdev = NULL;
284 acpi_status status;
285
286 /*
287 * Carry out two passes here and ignore errors in the first pass,
288 * because if the devices in question are memory blocks and
289 * CONFIG_MEMCG is set, one of the blocks may hold data structures
290 * that the other blocks depend on, but it is not known in advance which
291 * block holds them.
292 *
293 * If the first pass is successful, the second one isn't needed, though.
294 */
295 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
296 NULL, acpi_bus_offline, (void *)false,
297 (void **)&errdev);
298 if (status == AE_SUPPORT) {
299 dev_warn(errdev, "Offline disabled.\n");
300 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
301 acpi_bus_online, NULL, NULL, NULL);
302 return -EPERM;
303 }
304 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
305 if (errdev) {
306 errdev = NULL;
307 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
308 NULL, acpi_bus_offline, (void *)true,
309 (void **)&errdev);
310 if (!errdev || acpi_force_hot_remove)
311 acpi_bus_offline(handle, 0, (void *)true,
312 (void **)&errdev);
313
314 if (errdev && !acpi_force_hot_remove) {
315 dev_warn(errdev, "Offline failed.\n");
316 acpi_bus_online(handle, 0, NULL, NULL);
317 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
318 ACPI_UINT32_MAX, acpi_bus_online,
319 NULL, NULL, NULL);
320 return -EBUSY;
321 }
322 }
323 return 0;
324 }
325
326 static int acpi_scan_hot_remove(struct acpi_device *device)
327 {
328 acpi_handle handle = device->handle;
329 unsigned long long sta;
330 acpi_status status;
331
332 if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
333 if (!acpi_scan_is_offline(device, true))
334 return -EBUSY;
335 } else {
336 int error = acpi_scan_try_to_offline(device);
337 if (error)
338 return error;
339 }
340
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
342 "Hot-removing device %s...\n", dev_name(&device->dev)));
343
344 acpi_bus_trim(device);
345
346 acpi_evaluate_lck(handle, 0);
347 /*
348 * TBD: _EJD support.
349 */
350 status = acpi_evaluate_ej0(handle);
351 if (status == AE_NOT_FOUND)
352 return -ENODEV;
353 else if (ACPI_FAILURE(status))
354 return -EIO;
355
356 /*
357 * Verify if eject was indeed successful. If not, log an error
358 * message. No need to call _OST since _EJ0 call was made OK.
359 */
360 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
361 if (ACPI_FAILURE(status)) {
362 acpi_handle_warn(handle,
363 "Status check after eject failed (0x%x)\n", status);
364 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
365 acpi_handle_warn(handle,
366 "Eject incomplete - status 0x%llx\n", sta);
367 }
368
369 return 0;
370 }
371
372 static int acpi_scan_device_not_present(struct acpi_device *adev)
373 {
374 if (!acpi_device_enumerated(adev)) {
375 dev_warn(&adev->dev, "Still not present\n");
376 return -EALREADY;
377 }
378 acpi_bus_trim(adev);
379 return 0;
380 }
381
382 static int acpi_scan_device_check(struct acpi_device *adev)
383 {
384 int error;
385
386 acpi_bus_get_status(adev);
387 if (adev->status.present || adev->status.functional) {
388 /*
389 * This function is only called for device objects for which
390 * matching scan handlers exist. The only situation in which
391 * the scan handler is not attached to this device object yet
392 * is when the device has just appeared (either it wasn't
393 * present at all before or it was removed and then added
394 * again).
395 */
396 if (adev->handler) {
397 dev_warn(&adev->dev, "Already enumerated\n");
398 return -EALREADY;
399 }
400 error = acpi_bus_scan(adev->handle);
401 if (error) {
402 dev_warn(&adev->dev, "Namespace scan failure\n");
403 return error;
404 }
405 if (!adev->handler) {
406 dev_warn(&adev->dev, "Enumeration failure\n");
407 error = -ENODEV;
408 }
409 } else {
410 error = acpi_scan_device_not_present(adev);
411 }
412 return error;
413 }
414
415 static int acpi_scan_bus_check(struct acpi_device *adev)
416 {
417 struct acpi_scan_handler *handler = adev->handler;
418 struct acpi_device *child;
419 int error;
420
421 acpi_bus_get_status(adev);
422 if (!(adev->status.present || adev->status.functional)) {
423 acpi_scan_device_not_present(adev);
424 return 0;
425 }
426 if (handler && handler->hotplug.scan_dependent)
427 return handler->hotplug.scan_dependent(adev);
428
429 error = acpi_bus_scan(adev->handle);
430 if (error) {
431 dev_warn(&adev->dev, "Namespace scan failure\n");
432 return error;
433 }
434 list_for_each_entry(child, &adev->children, node) {
435 error = acpi_scan_bus_check(child);
436 if (error)
437 return error;
438 }
439 return 0;
440 }
441
442 static void acpi_device_hotplug(void *data, u32 src)
443 {
444 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
445 struct acpi_device *adev = data;
446 int error;
447
448 lock_device_hotplug();
449 mutex_lock(&acpi_scan_lock);
450
451 /*
452 * The device object's ACPI handle cannot become invalid as long as we
453 * are holding acpi_scan_lock, but it may have become invalid before
454 * that lock was acquired.
455 */
456 if (adev->handle == INVALID_ACPI_HANDLE)
457 goto out;
458
459 switch (src) {
460 case ACPI_NOTIFY_BUS_CHECK:
461 error = acpi_scan_bus_check(adev);
462 break;
463 case ACPI_NOTIFY_DEVICE_CHECK:
464 error = acpi_scan_device_check(adev);
465 break;
466 case ACPI_NOTIFY_EJECT_REQUEST:
467 case ACPI_OST_EC_OSPM_EJECT:
468 error = acpi_scan_hot_remove(adev);
469 break;
470 default:
471 error = -EINVAL;
472 break;
473 }
474 if (!error)
475 ost_code = ACPI_OST_SC_SUCCESS;
476
477 out:
478 acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL);
479 put_device(&adev->dev);
480 mutex_unlock(&acpi_scan_lock);
481 unlock_device_hotplug();
482 }
483
484 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
485 {
486 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
487 struct acpi_device *adev;
488 acpi_status status;
489
490 if (acpi_bus_get_device(handle, &adev))
491 goto err_out;
492
493 switch (type) {
494 case ACPI_NOTIFY_BUS_CHECK:
495 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
496 break;
497 case ACPI_NOTIFY_DEVICE_CHECK:
498 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
499 break;
500 case ACPI_NOTIFY_EJECT_REQUEST:
501 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
502 if (!adev->handler)
503 goto err_out;
504
505 if (!adev->handler->hotplug.enabled) {
506 acpi_handle_err(handle, "Eject disabled\n");
507 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
508 goto err_out;
509 }
510 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
511 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
512 break;
513 default:
514 /* non-hotplug event; possibly handled by other handler */
515 return;
516 }
517 get_device(&adev->dev);
518 status = acpi_hotplug_execute(acpi_device_hotplug, adev, type);
519 if (ACPI_SUCCESS(status))
520 return;
521
522 put_device(&adev->dev);
523
524 err_out:
525 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
526 }
527
528 static ssize_t real_power_state_show(struct device *dev,
529 struct device_attribute *attr, char *buf)
530 {
531 struct acpi_device *adev = to_acpi_device(dev);
532 int state;
533 int ret;
534
535 ret = acpi_device_get_power(adev, &state);
536 if (ret)
537 return ret;
538
539 return sprintf(buf, "%s\n", acpi_power_state_string(state));
540 }
541
542 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
543
544 static ssize_t power_state_show(struct device *dev,
545 struct device_attribute *attr, char *buf)
546 {
547 struct acpi_device *adev = to_acpi_device(dev);
548
549 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
550 }
551
552 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
553
554 static ssize_t
555 acpi_eject_store(struct device *d, struct device_attribute *attr,
556 const char *buf, size_t count)
557 {
558 struct acpi_device *acpi_device = to_acpi_device(d);
559 acpi_object_type not_used;
560 acpi_status status;
561
562 if (!count || buf[0] != '1')
563 return -EINVAL;
564
565 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
566 && !acpi_device->driver)
567 return -ENODEV;
568
569 status = acpi_get_type(acpi_device->handle, &not_used);
570 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
571 return -ENODEV;
572
573 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
574 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
575 get_device(&acpi_device->dev);
576 status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device,
577 ACPI_OST_EC_OSPM_EJECT);
578 if (ACPI_SUCCESS(status))
579 return count;
580
581 put_device(&acpi_device->dev);
582 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
583 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
584 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
585 }
586
587 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
588
589 static ssize_t
590 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
591 struct acpi_device *acpi_dev = to_acpi_device(dev);
592
593 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
594 }
595 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
596
597 static ssize_t acpi_device_uid_show(struct device *dev,
598 struct device_attribute *attr, char *buf)
599 {
600 struct acpi_device *acpi_dev = to_acpi_device(dev);
601
602 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
603 }
604 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
605
606 static ssize_t acpi_device_adr_show(struct device *dev,
607 struct device_attribute *attr, char *buf)
608 {
609 struct acpi_device *acpi_dev = to_acpi_device(dev);
610
611 return sprintf(buf, "0x%08x\n",
612 (unsigned int)(acpi_dev->pnp.bus_address));
613 }
614 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
615
616 static ssize_t
617 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
618 struct acpi_device *acpi_dev = to_acpi_device(dev);
619 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
620 int result;
621
622 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
623 if (result)
624 goto end;
625
626 result = sprintf(buf, "%s\n", (char*)path.pointer);
627 kfree(path.pointer);
628 end:
629 return result;
630 }
631 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
632
633 /* sysfs file that shows description text from the ACPI _STR method */
634 static ssize_t description_show(struct device *dev,
635 struct device_attribute *attr,
636 char *buf) {
637 struct acpi_device *acpi_dev = to_acpi_device(dev);
638 int result;
639
640 if (acpi_dev->pnp.str_obj == NULL)
641 return 0;
642
643 /*
644 * The _STR object contains a Unicode identifier for a device.
645 * We need to convert to utf-8 so it can be displayed.
646 */
647 result = utf16s_to_utf8s(
648 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
649 acpi_dev->pnp.str_obj->buffer.length,
650 UTF16_LITTLE_ENDIAN, buf,
651 PAGE_SIZE);
652
653 buf[result++] = '\n';
654
655 return result;
656 }
657 static DEVICE_ATTR(description, 0444, description_show, NULL);
658
659 static ssize_t
660 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
661 char *buf) {
662 struct acpi_device *acpi_dev = to_acpi_device(dev);
663
664 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
665 }
666 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
667
668 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
669 char *buf) {
670 struct acpi_device *acpi_dev = to_acpi_device(dev);
671 acpi_status status;
672 unsigned long long sta;
673
674 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
675 if (ACPI_FAILURE(status))
676 return -ENODEV;
677
678 return sprintf(buf, "%llu\n", sta);
679 }
680 static DEVICE_ATTR_RO(status);
681
682 static int acpi_device_setup_files(struct acpi_device *dev)
683 {
684 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
685 acpi_status status;
686 unsigned long long sun;
687 int result = 0;
688
689 /*
690 * Devices gotten from FADT don't have a "path" attribute
691 */
692 if (dev->handle) {
693 result = device_create_file(&dev->dev, &dev_attr_path);
694 if (result)
695 goto end;
696 }
697
698 if (!list_empty(&dev->pnp.ids)) {
699 result = device_create_file(&dev->dev, &dev_attr_hid);
700 if (result)
701 goto end;
702
703 result = device_create_file(&dev->dev, &dev_attr_modalias);
704 if (result)
705 goto end;
706 }
707
708 /*
709 * If device has _STR, 'description' file is created
710 */
711 if (acpi_has_method(dev->handle, "_STR")) {
712 status = acpi_evaluate_object(dev->handle, "_STR",
713 NULL, &buffer);
714 if (ACPI_FAILURE(status))
715 buffer.pointer = NULL;
716 dev->pnp.str_obj = buffer.pointer;
717 result = device_create_file(&dev->dev, &dev_attr_description);
718 if (result)
719 goto end;
720 }
721
722 if (dev->pnp.type.bus_address)
723 result = device_create_file(&dev->dev, &dev_attr_adr);
724 if (dev->pnp.unique_id)
725 result = device_create_file(&dev->dev, &dev_attr_uid);
726
727 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
728 if (ACPI_SUCCESS(status)) {
729 dev->pnp.sun = (unsigned long)sun;
730 result = device_create_file(&dev->dev, &dev_attr_sun);
731 if (result)
732 goto end;
733 } else {
734 dev->pnp.sun = (unsigned long)-1;
735 }
736
737 if (acpi_has_method(dev->handle, "_STA")) {
738 result = device_create_file(&dev->dev, &dev_attr_status);
739 if (result)
740 goto end;
741 }
742
743 /*
744 * If device has _EJ0, 'eject' file is created that is used to trigger
745 * hot-removal function from userland.
746 */
747 if (acpi_has_method(dev->handle, "_EJ0")) {
748 result = device_create_file(&dev->dev, &dev_attr_eject);
749 if (result)
750 return result;
751 }
752
753 if (dev->flags.power_manageable) {
754 result = device_create_file(&dev->dev, &dev_attr_power_state);
755 if (result)
756 return result;
757
758 if (dev->power.flags.power_resources)
759 result = device_create_file(&dev->dev,
760 &dev_attr_real_power_state);
761 }
762
763 end:
764 return result;
765 }
766
767 static void acpi_device_remove_files(struct acpi_device *dev)
768 {
769 if (dev->flags.power_manageable) {
770 device_remove_file(&dev->dev, &dev_attr_power_state);
771 if (dev->power.flags.power_resources)
772 device_remove_file(&dev->dev,
773 &dev_attr_real_power_state);
774 }
775
776 /*
777 * If device has _STR, remove 'description' file
778 */
779 if (acpi_has_method(dev->handle, "_STR")) {
780 kfree(dev->pnp.str_obj);
781 device_remove_file(&dev->dev, &dev_attr_description);
782 }
783 /*
784 * If device has _EJ0, remove 'eject' file.
785 */
786 if (acpi_has_method(dev->handle, "_EJ0"))
787 device_remove_file(&dev->dev, &dev_attr_eject);
788
789 if (acpi_has_method(dev->handle, "_SUN"))
790 device_remove_file(&dev->dev, &dev_attr_sun);
791
792 if (dev->pnp.unique_id)
793 device_remove_file(&dev->dev, &dev_attr_uid);
794 if (dev->pnp.type.bus_address)
795 device_remove_file(&dev->dev, &dev_attr_adr);
796 device_remove_file(&dev->dev, &dev_attr_modalias);
797 device_remove_file(&dev->dev, &dev_attr_hid);
798 if (acpi_has_method(dev->handle, "_STA"))
799 device_remove_file(&dev->dev, &dev_attr_status);
800 if (dev->handle)
801 device_remove_file(&dev->dev, &dev_attr_path);
802 }
803 /* --------------------------------------------------------------------------
804 ACPI Bus operations
805 -------------------------------------------------------------------------- */
806
807 static const struct acpi_device_id *__acpi_match_device(
808 struct acpi_device *device, const struct acpi_device_id *ids)
809 {
810 const struct acpi_device_id *id;
811 struct acpi_hardware_id *hwid;
812
813 /*
814 * If the device is not present, it is unnecessary to load device
815 * driver for it.
816 */
817 if (!device->status.present)
818 return NULL;
819
820 for (id = ids; id->id[0]; id++)
821 list_for_each_entry(hwid, &device->pnp.ids, list)
822 if (!strcmp((char *) id->id, hwid->id))
823 return id;
824
825 return NULL;
826 }
827
828 /**
829 * acpi_match_device - Match a struct device against a given list of ACPI IDs
830 * @ids: Array of struct acpi_device_id object to match against.
831 * @dev: The device structure to match.
832 *
833 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
834 * object for that handle and use that object to match against a given list of
835 * device IDs.
836 *
837 * Return a pointer to the first matching ID on success or %NULL on failure.
838 */
839 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
840 const struct device *dev)
841 {
842 struct acpi_device *adev;
843 acpi_handle handle = ACPI_HANDLE(dev);
844
845 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
846 return NULL;
847
848 return __acpi_match_device(adev, ids);
849 }
850 EXPORT_SYMBOL_GPL(acpi_match_device);
851
852 int acpi_match_device_ids(struct acpi_device *device,
853 const struct acpi_device_id *ids)
854 {
855 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
856 }
857 EXPORT_SYMBOL(acpi_match_device_ids);
858
859 static void acpi_free_power_resources_lists(struct acpi_device *device)
860 {
861 int i;
862
863 if (device->wakeup.flags.valid)
864 acpi_power_resources_list_free(&device->wakeup.resources);
865
866 if (!device->flags.power_manageable)
867 return;
868
869 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
870 struct acpi_device_power_state *ps = &device->power.states[i];
871 acpi_power_resources_list_free(&ps->resources);
872 }
873 }
874
875 static void acpi_device_release(struct device *dev)
876 {
877 struct acpi_device *acpi_dev = to_acpi_device(dev);
878
879 acpi_free_pnp_ids(&acpi_dev->pnp);
880 acpi_free_power_resources_lists(acpi_dev);
881 kfree(acpi_dev);
882 }
883
884 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
885 {
886 struct acpi_device *acpi_dev = to_acpi_device(dev);
887 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
888
889 return acpi_dev->flags.match_driver
890 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
891 }
892
893 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
894 {
895 struct acpi_device *acpi_dev = to_acpi_device(dev);
896 int len;
897
898 if (list_empty(&acpi_dev->pnp.ids))
899 return 0;
900
901 if (add_uevent_var(env, "MODALIAS="))
902 return -ENOMEM;
903 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
904 sizeof(env->buf) - env->buflen);
905 if (len <= 0)
906 return len;
907 env->buflen += len;
908 return 0;
909 }
910
911 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
912 {
913 struct acpi_device *device = data;
914
915 device->driver->ops.notify(device, event);
916 }
917
918 static acpi_status acpi_device_notify_fixed(void *data)
919 {
920 struct acpi_device *device = data;
921
922 /* Fixed hardware devices have no handles */
923 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
924 return AE_OK;
925 }
926
927 static int acpi_device_install_notify_handler(struct acpi_device *device)
928 {
929 acpi_status status;
930
931 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
932 status =
933 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
934 acpi_device_notify_fixed,
935 device);
936 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
937 status =
938 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
939 acpi_device_notify_fixed,
940 device);
941 else
942 status = acpi_install_notify_handler(device->handle,
943 ACPI_DEVICE_NOTIFY,
944 acpi_device_notify,
945 device);
946
947 if (ACPI_FAILURE(status))
948 return -EINVAL;
949 return 0;
950 }
951
952 static void acpi_device_remove_notify_handler(struct acpi_device *device)
953 {
954 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
955 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
956 acpi_device_notify_fixed);
957 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
958 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
959 acpi_device_notify_fixed);
960 else
961 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
962 acpi_device_notify);
963 }
964
965 static int acpi_device_probe(struct device *dev)
966 {
967 struct acpi_device *acpi_dev = to_acpi_device(dev);
968 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
969 int ret;
970
971 if (acpi_dev->handler)
972 return -EINVAL;
973
974 if (!acpi_drv->ops.add)
975 return -ENOSYS;
976
977 ret = acpi_drv->ops.add(acpi_dev);
978 if (ret)
979 return ret;
980
981 acpi_dev->driver = acpi_drv;
982 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
983 "Driver [%s] successfully bound to device [%s]\n",
984 acpi_drv->name, acpi_dev->pnp.bus_id));
985
986 if (acpi_drv->ops.notify) {
987 ret = acpi_device_install_notify_handler(acpi_dev);
988 if (ret) {
989 if (acpi_drv->ops.remove)
990 acpi_drv->ops.remove(acpi_dev);
991
992 acpi_dev->driver = NULL;
993 acpi_dev->driver_data = NULL;
994 return ret;
995 }
996 }
997
998 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
999 acpi_drv->name, acpi_dev->pnp.bus_id));
1000 get_device(dev);
1001 return 0;
1002 }
1003
1004 static int acpi_device_remove(struct device * dev)
1005 {
1006 struct acpi_device *acpi_dev = to_acpi_device(dev);
1007 struct acpi_driver *acpi_drv = acpi_dev->driver;
1008
1009 if (acpi_drv) {
1010 if (acpi_drv->ops.notify)
1011 acpi_device_remove_notify_handler(acpi_dev);
1012 if (acpi_drv->ops.remove)
1013 acpi_drv->ops.remove(acpi_dev);
1014 }
1015 acpi_dev->driver = NULL;
1016 acpi_dev->driver_data = NULL;
1017
1018 put_device(dev);
1019 return 0;
1020 }
1021
1022 struct bus_type acpi_bus_type = {
1023 .name = "acpi",
1024 .match = acpi_bus_match,
1025 .probe = acpi_device_probe,
1026 .remove = acpi_device_remove,
1027 .uevent = acpi_device_uevent,
1028 };
1029
1030 static void acpi_device_del(struct acpi_device *device)
1031 {
1032 mutex_lock(&acpi_device_lock);
1033 if (device->parent)
1034 list_del(&device->node);
1035
1036 list_del(&device->wakeup_list);
1037 mutex_unlock(&acpi_device_lock);
1038
1039 acpi_power_add_remove_device(device, false);
1040 acpi_device_remove_files(device);
1041 if (device->remove)
1042 device->remove(device);
1043
1044 device_del(&device->dev);
1045 }
1046
1047 static LIST_HEAD(acpi_device_del_list);
1048 static DEFINE_MUTEX(acpi_device_del_lock);
1049
1050 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1051 {
1052 for (;;) {
1053 struct acpi_device *adev;
1054
1055 mutex_lock(&acpi_device_del_lock);
1056
1057 if (list_empty(&acpi_device_del_list)) {
1058 mutex_unlock(&acpi_device_del_lock);
1059 break;
1060 }
1061 adev = list_first_entry(&acpi_device_del_list,
1062 struct acpi_device, del_list);
1063 list_del(&adev->del_list);
1064
1065 mutex_unlock(&acpi_device_del_lock);
1066
1067 acpi_device_del(adev);
1068 /*
1069 * Drop references to all power resources that might have been
1070 * used by the device.
1071 */
1072 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1073 put_device(&adev->dev);
1074 }
1075 }
1076
1077 /**
1078 * acpi_scan_drop_device - Drop an ACPI device object.
1079 * @handle: Handle of an ACPI namespace node, not used.
1080 * @context: Address of the ACPI device object to drop.
1081 *
1082 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1083 * namespace node the device object pointed to by @context is attached to.
1084 *
1085 * The unregistration is carried out asynchronously to avoid running
1086 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1087 * ensure the correct ordering (the device objects must be unregistered in the
1088 * same order in which the corresponding namespace nodes are deleted).
1089 */
1090 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1091 {
1092 static DECLARE_WORK(work, acpi_device_del_work_fn);
1093 struct acpi_device *adev = context;
1094
1095 mutex_lock(&acpi_device_del_lock);
1096
1097 /*
1098 * Use the ACPI hotplug workqueue which is ordered, so this work item
1099 * won't run after any hotplug work items submitted subsequently. That
1100 * prevents attempts to register device objects identical to those being
1101 * deleted from happening concurrently (such attempts result from
1102 * hotplug events handled via the ACPI hotplug workqueue). It also will
1103 * run after all of the work items submitted previosuly, which helps
1104 * those work items to ensure that they are not accessing stale device
1105 * objects.
1106 */
1107 if (list_empty(&acpi_device_del_list))
1108 acpi_queue_hotplug_work(&work);
1109
1110 list_add_tail(&adev->del_list, &acpi_device_del_list);
1111 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1112 adev->handle = INVALID_ACPI_HANDLE;
1113
1114 mutex_unlock(&acpi_device_del_lock);
1115 }
1116
1117 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1118 {
1119 acpi_status status;
1120
1121 if (!device)
1122 return -EINVAL;
1123
1124 status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device);
1125 if (ACPI_FAILURE(status) || !*device) {
1126 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1127 handle));
1128 return -ENODEV;
1129 }
1130 return 0;
1131 }
1132 EXPORT_SYMBOL(acpi_bus_get_device);
1133
1134 int acpi_device_add(struct acpi_device *device,
1135 void (*release)(struct device *))
1136 {
1137 int result;
1138 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1139 int found = 0;
1140
1141 if (device->handle) {
1142 acpi_status status;
1143
1144 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1145 device);
1146 if (ACPI_FAILURE(status)) {
1147 acpi_handle_err(device->handle,
1148 "Unable to attach device data\n");
1149 return -ENODEV;
1150 }
1151 }
1152
1153 /*
1154 * Linkage
1155 * -------
1156 * Link this device to its parent and siblings.
1157 */
1158 INIT_LIST_HEAD(&device->children);
1159 INIT_LIST_HEAD(&device->node);
1160 INIT_LIST_HEAD(&device->wakeup_list);
1161 INIT_LIST_HEAD(&device->physical_node_list);
1162 INIT_LIST_HEAD(&device->del_list);
1163 mutex_init(&device->physical_node_lock);
1164
1165 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1166 if (!new_bus_id) {
1167 pr_err(PREFIX "Memory allocation error\n");
1168 result = -ENOMEM;
1169 goto err_detach;
1170 }
1171
1172 mutex_lock(&acpi_device_lock);
1173 /*
1174 * Find suitable bus_id and instance number in acpi_bus_id_list
1175 * If failed, create one and link it into acpi_bus_id_list
1176 */
1177 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1178 if (!strcmp(acpi_device_bus_id->bus_id,
1179 acpi_device_hid(device))) {
1180 acpi_device_bus_id->instance_no++;
1181 found = 1;
1182 kfree(new_bus_id);
1183 break;
1184 }
1185 }
1186 if (!found) {
1187 acpi_device_bus_id = new_bus_id;
1188 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1189 acpi_device_bus_id->instance_no = 0;
1190 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1191 }
1192 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1193
1194 if (device->parent)
1195 list_add_tail(&device->node, &device->parent->children);
1196
1197 if (device->wakeup.flags.valid)
1198 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1199 mutex_unlock(&acpi_device_lock);
1200
1201 if (device->parent)
1202 device->dev.parent = &device->parent->dev;
1203 device->dev.bus = &acpi_bus_type;
1204 device->dev.release = release;
1205 result = device_add(&device->dev);
1206 if (result) {
1207 dev_err(&device->dev, "Error registering device\n");
1208 goto err;
1209 }
1210
1211 result = acpi_device_setup_files(device);
1212 if (result)
1213 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1214 dev_name(&device->dev));
1215
1216 return 0;
1217
1218 err:
1219 mutex_lock(&acpi_device_lock);
1220 if (device->parent)
1221 list_del(&device->node);
1222 list_del(&device->wakeup_list);
1223 mutex_unlock(&acpi_device_lock);
1224
1225 err_detach:
1226 acpi_detach_data(device->handle, acpi_scan_drop_device);
1227 return result;
1228 }
1229
1230 /* --------------------------------------------------------------------------
1231 Driver Management
1232 -------------------------------------------------------------------------- */
1233 /**
1234 * acpi_bus_register_driver - register a driver with the ACPI bus
1235 * @driver: driver being registered
1236 *
1237 * Registers a driver with the ACPI bus. Searches the namespace for all
1238 * devices that match the driver's criteria and binds. Returns zero for
1239 * success or a negative error status for failure.
1240 */
1241 int acpi_bus_register_driver(struct acpi_driver *driver)
1242 {
1243 int ret;
1244
1245 if (acpi_disabled)
1246 return -ENODEV;
1247 driver->drv.name = driver->name;
1248 driver->drv.bus = &acpi_bus_type;
1249 driver->drv.owner = driver->owner;
1250
1251 ret = driver_register(&driver->drv);
1252 return ret;
1253 }
1254
1255 EXPORT_SYMBOL(acpi_bus_register_driver);
1256
1257 /**
1258 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1259 * @driver: driver to unregister
1260 *
1261 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1262 * devices that match the driver's criteria and unbinds.
1263 */
1264 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1265 {
1266 driver_unregister(&driver->drv);
1267 }
1268
1269 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1270
1271 /* --------------------------------------------------------------------------
1272 Device Enumeration
1273 -------------------------------------------------------------------------- */
1274 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1275 {
1276 struct acpi_device *device = NULL;
1277 acpi_status status;
1278
1279 /*
1280 * Fixed hardware devices do not appear in the namespace and do not
1281 * have handles, but we fabricate acpi_devices for them, so we have
1282 * to deal with them specially.
1283 */
1284 if (!handle)
1285 return acpi_root;
1286
1287 do {
1288 status = acpi_get_parent(handle, &handle);
1289 if (ACPI_FAILURE(status))
1290 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1291 } while (acpi_bus_get_device(handle, &device));
1292 return device;
1293 }
1294
1295 acpi_status
1296 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1297 {
1298 acpi_status status;
1299 acpi_handle tmp;
1300 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1301 union acpi_object *obj;
1302
1303 status = acpi_get_handle(handle, "_EJD", &tmp);
1304 if (ACPI_FAILURE(status))
1305 return status;
1306
1307 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1308 if (ACPI_SUCCESS(status)) {
1309 obj = buffer.pointer;
1310 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1311 ejd);
1312 kfree(buffer.pointer);
1313 }
1314 return status;
1315 }
1316 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1317
1318 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1319 struct acpi_device_wakeup *wakeup)
1320 {
1321 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1322 union acpi_object *package = NULL;
1323 union acpi_object *element = NULL;
1324 acpi_status status;
1325 int err = -ENODATA;
1326
1327 if (!wakeup)
1328 return -EINVAL;
1329
1330 INIT_LIST_HEAD(&wakeup->resources);
1331
1332 /* _PRW */
1333 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1334 if (ACPI_FAILURE(status)) {
1335 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1336 return err;
1337 }
1338
1339 package = (union acpi_object *)buffer.pointer;
1340
1341 if (!package || package->package.count < 2)
1342 goto out;
1343
1344 element = &(package->package.elements[0]);
1345 if (!element)
1346 goto out;
1347
1348 if (element->type == ACPI_TYPE_PACKAGE) {
1349 if ((element->package.count < 2) ||
1350 (element->package.elements[0].type !=
1351 ACPI_TYPE_LOCAL_REFERENCE)
1352 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1353 goto out;
1354
1355 wakeup->gpe_device =
1356 element->package.elements[0].reference.handle;
1357 wakeup->gpe_number =
1358 (u32) element->package.elements[1].integer.value;
1359 } else if (element->type == ACPI_TYPE_INTEGER) {
1360 wakeup->gpe_device = NULL;
1361 wakeup->gpe_number = element->integer.value;
1362 } else {
1363 goto out;
1364 }
1365
1366 element = &(package->package.elements[1]);
1367 if (element->type != ACPI_TYPE_INTEGER)
1368 goto out;
1369
1370 wakeup->sleep_state = element->integer.value;
1371
1372 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1373 if (err)
1374 goto out;
1375
1376 if (!list_empty(&wakeup->resources)) {
1377 int sleep_state;
1378
1379 err = acpi_power_wakeup_list_init(&wakeup->resources,
1380 &sleep_state);
1381 if (err) {
1382 acpi_handle_warn(handle, "Retrieving current states "
1383 "of wakeup power resources failed\n");
1384 acpi_power_resources_list_free(&wakeup->resources);
1385 goto out;
1386 }
1387 if (sleep_state < wakeup->sleep_state) {
1388 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1389 "(S%d) by S%d from power resources\n",
1390 (int)wakeup->sleep_state, sleep_state);
1391 wakeup->sleep_state = sleep_state;
1392 }
1393 }
1394 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1395
1396 out:
1397 kfree(buffer.pointer);
1398 return err;
1399 }
1400
1401 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1402 {
1403 struct acpi_device_id button_device_ids[] = {
1404 {"PNP0C0C", 0},
1405 {"PNP0C0D", 0},
1406 {"PNP0C0E", 0},
1407 {"", 0},
1408 };
1409 acpi_status status;
1410 acpi_event_status event_status;
1411
1412 device->wakeup.flags.notifier_present = 0;
1413
1414 /* Power button, Lid switch always enable wakeup */
1415 if (!acpi_match_device_ids(device, button_device_ids)) {
1416 device->wakeup.flags.run_wake = 1;
1417 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1418 /* Do not use Lid/sleep button for S5 wakeup */
1419 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1420 device->wakeup.sleep_state = ACPI_STATE_S4;
1421 }
1422 device_set_wakeup_capable(&device->dev, true);
1423 return;
1424 }
1425
1426 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1427 device->wakeup.gpe_number,
1428 &event_status);
1429 if (status == AE_OK)
1430 device->wakeup.flags.run_wake =
1431 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1432 }
1433
1434 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1435 {
1436 int err;
1437
1438 /* Presence of _PRW indicates wake capable */
1439 if (!acpi_has_method(device->handle, "_PRW"))
1440 return;
1441
1442 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1443 &device->wakeup);
1444 if (err) {
1445 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1446 return;
1447 }
1448
1449 device->wakeup.flags.valid = 1;
1450 device->wakeup.prepare_count = 0;
1451 acpi_bus_set_run_wake_flags(device);
1452 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1453 * system for the ACPI device with the _PRW object.
1454 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1455 * So it is necessary to call _DSW object first. Only when it is not
1456 * present will the _PSW object used.
1457 */
1458 err = acpi_device_sleep_wake(device, 0, 0, 0);
1459 if (err)
1460 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1461 "error in _DSW or _PSW evaluation\n"));
1462 }
1463
1464 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1465 {
1466 struct acpi_device_power_state *ps = &device->power.states[state];
1467 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1468 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1469 acpi_status status;
1470
1471 INIT_LIST_HEAD(&ps->resources);
1472
1473 /* Evaluate "_PRx" to get referenced power resources */
1474 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1475 if (ACPI_SUCCESS(status)) {
1476 union acpi_object *package = buffer.pointer;
1477
1478 if (buffer.length && package
1479 && package->type == ACPI_TYPE_PACKAGE
1480 && package->package.count) {
1481 int err = acpi_extract_power_resources(package, 0,
1482 &ps->resources);
1483 if (!err)
1484 device->power.flags.power_resources = 1;
1485 }
1486 ACPI_FREE(buffer.pointer);
1487 }
1488
1489 /* Evaluate "_PSx" to see if we can do explicit sets */
1490 pathname[2] = 'S';
1491 if (acpi_has_method(device->handle, pathname))
1492 ps->flags.explicit_set = 1;
1493
1494 /*
1495 * State is valid if there are means to put the device into it.
1496 * D3hot is only valid if _PR3 present.
1497 */
1498 if (!list_empty(&ps->resources)
1499 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1500 ps->flags.valid = 1;
1501 ps->flags.os_accessible = 1;
1502 }
1503
1504 ps->power = -1; /* Unknown - driver assigned */
1505 ps->latency = -1; /* Unknown - driver assigned */
1506 }
1507
1508 static void acpi_bus_get_power_flags(struct acpi_device *device)
1509 {
1510 u32 i;
1511
1512 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1513 if (!acpi_has_method(device->handle, "_PS0") &&
1514 !acpi_has_method(device->handle, "_PR0"))
1515 return;
1516
1517 device->flags.power_manageable = 1;
1518
1519 /*
1520 * Power Management Flags
1521 */
1522 if (acpi_has_method(device->handle, "_PSC"))
1523 device->power.flags.explicit_get = 1;
1524 if (acpi_has_method(device->handle, "_IRC"))
1525 device->power.flags.inrush_current = 1;
1526
1527 /*
1528 * Enumerate supported power management states
1529 */
1530 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1531 acpi_bus_init_power_state(device, i);
1532
1533 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1534
1535 /* Set defaults for D0 and D3 states (always valid) */
1536 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1537 device->power.states[ACPI_STATE_D0].power = 100;
1538 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1539 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1540
1541 /* Set D3cold's explicit_set flag if _PS3 exists. */
1542 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1543 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1544
1545 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1546 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1547 device->power.flags.power_resources)
1548 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1549
1550 if (acpi_bus_init_power(device)) {
1551 acpi_free_power_resources_lists(device);
1552 device->flags.power_manageable = 0;
1553 }
1554 }
1555
1556 static void acpi_bus_get_flags(struct acpi_device *device)
1557 {
1558 /* Presence of _STA indicates 'dynamic_status' */
1559 if (acpi_has_method(device->handle, "_STA"))
1560 device->flags.dynamic_status = 1;
1561
1562 /* Presence of _RMV indicates 'removable' */
1563 if (acpi_has_method(device->handle, "_RMV"))
1564 device->flags.removable = 1;
1565
1566 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1567 if (acpi_has_method(device->handle, "_EJD") ||
1568 acpi_has_method(device->handle, "_EJ0"))
1569 device->flags.ejectable = 1;
1570 }
1571
1572 static void acpi_device_get_busid(struct acpi_device *device)
1573 {
1574 char bus_id[5] = { '?', 0 };
1575 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1576 int i = 0;
1577
1578 /*
1579 * Bus ID
1580 * ------
1581 * The device's Bus ID is simply the object name.
1582 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1583 */
1584 if (ACPI_IS_ROOT_DEVICE(device)) {
1585 strcpy(device->pnp.bus_id, "ACPI");
1586 return;
1587 }
1588
1589 switch (device->device_type) {
1590 case ACPI_BUS_TYPE_POWER_BUTTON:
1591 strcpy(device->pnp.bus_id, "PWRF");
1592 break;
1593 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1594 strcpy(device->pnp.bus_id, "SLPF");
1595 break;
1596 default:
1597 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1598 /* Clean up trailing underscores (if any) */
1599 for (i = 3; i > 1; i--) {
1600 if (bus_id[i] == '_')
1601 bus_id[i] = '\0';
1602 else
1603 break;
1604 }
1605 strcpy(device->pnp.bus_id, bus_id);
1606 break;
1607 }
1608 }
1609
1610 /*
1611 * acpi_ata_match - see if an acpi object is an ATA device
1612 *
1613 * If an acpi object has one of the ACPI ATA methods defined,
1614 * then we can safely call it an ATA device.
1615 */
1616 bool acpi_ata_match(acpi_handle handle)
1617 {
1618 return acpi_has_method(handle, "_GTF") ||
1619 acpi_has_method(handle, "_GTM") ||
1620 acpi_has_method(handle, "_STM") ||
1621 acpi_has_method(handle, "_SDD");
1622 }
1623
1624 /*
1625 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1626 *
1627 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1628 * then we can safely call it an ejectable drive bay
1629 */
1630 bool acpi_bay_match(acpi_handle handle)
1631 {
1632 acpi_handle phandle;
1633
1634 if (!acpi_has_method(handle, "_EJ0"))
1635 return false;
1636 if (acpi_ata_match(handle))
1637 return true;
1638 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1639 return false;
1640
1641 return acpi_ata_match(phandle);
1642 }
1643
1644 /*
1645 * acpi_dock_match - see if an acpi object has a _DCK method
1646 */
1647 bool acpi_dock_match(acpi_handle handle)
1648 {
1649 return acpi_has_method(handle, "_DCK");
1650 }
1651
1652 const char *acpi_device_hid(struct acpi_device *device)
1653 {
1654 struct acpi_hardware_id *hid;
1655
1656 if (list_empty(&device->pnp.ids))
1657 return dummy_hid;
1658
1659 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1660 return hid->id;
1661 }
1662 EXPORT_SYMBOL(acpi_device_hid);
1663
1664 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1665 {
1666 struct acpi_hardware_id *id;
1667
1668 id = kmalloc(sizeof(*id), GFP_KERNEL);
1669 if (!id)
1670 return;
1671
1672 id->id = kstrdup(dev_id, GFP_KERNEL);
1673 if (!id->id) {
1674 kfree(id);
1675 return;
1676 }
1677
1678 list_add_tail(&id->list, &pnp->ids);
1679 pnp->type.hardware_id = 1;
1680 }
1681
1682 /*
1683 * Old IBM workstations have a DSDT bug wherein the SMBus object
1684 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1685 * prefix. Work around this.
1686 */
1687 static bool acpi_ibm_smbus_match(acpi_handle handle)
1688 {
1689 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1690 struct acpi_buffer path = { sizeof(node_name), node_name };
1691
1692 if (!dmi_name_in_vendors("IBM"))
1693 return false;
1694
1695 /* Look for SMBS object */
1696 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1697 strcmp("SMBS", path.pointer))
1698 return false;
1699
1700 /* Does it have the necessary (but misnamed) methods? */
1701 if (acpi_has_method(handle, "SBI") &&
1702 acpi_has_method(handle, "SBR") &&
1703 acpi_has_method(handle, "SBW"))
1704 return true;
1705
1706 return false;
1707 }
1708
1709 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1710 int device_type)
1711 {
1712 acpi_status status;
1713 struct acpi_device_info *info;
1714 struct acpi_pnp_device_id_list *cid_list;
1715 int i;
1716
1717 switch (device_type) {
1718 case ACPI_BUS_TYPE_DEVICE:
1719 if (handle == ACPI_ROOT_OBJECT) {
1720 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1721 break;
1722 }
1723
1724 status = acpi_get_object_info(handle, &info);
1725 if (ACPI_FAILURE(status)) {
1726 pr_err(PREFIX "%s: Error reading device info\n",
1727 __func__);
1728 return;
1729 }
1730
1731 if (info->valid & ACPI_VALID_HID)
1732 acpi_add_id(pnp, info->hardware_id.string);
1733 if (info->valid & ACPI_VALID_CID) {
1734 cid_list = &info->compatible_id_list;
1735 for (i = 0; i < cid_list->count; i++)
1736 acpi_add_id(pnp, cid_list->ids[i].string);
1737 }
1738 if (info->valid & ACPI_VALID_ADR) {
1739 pnp->bus_address = info->address;
1740 pnp->type.bus_address = 1;
1741 }
1742 if (info->valid & ACPI_VALID_UID)
1743 pnp->unique_id = kstrdup(info->unique_id.string,
1744 GFP_KERNEL);
1745
1746 kfree(info);
1747
1748 /*
1749 * Some devices don't reliably have _HIDs & _CIDs, so add
1750 * synthetic HIDs to make sure drivers can find them.
1751 */
1752 if (acpi_is_video_device(handle))
1753 acpi_add_id(pnp, ACPI_VIDEO_HID);
1754 else if (acpi_bay_match(handle))
1755 acpi_add_id(pnp, ACPI_BAY_HID);
1756 else if (acpi_dock_match(handle))
1757 acpi_add_id(pnp, ACPI_DOCK_HID);
1758 else if (acpi_ibm_smbus_match(handle))
1759 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1760 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1761 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1762 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1763 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1764 }
1765
1766 break;
1767 case ACPI_BUS_TYPE_POWER:
1768 acpi_add_id(pnp, ACPI_POWER_HID);
1769 break;
1770 case ACPI_BUS_TYPE_PROCESSOR:
1771 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1772 break;
1773 case ACPI_BUS_TYPE_THERMAL:
1774 acpi_add_id(pnp, ACPI_THERMAL_HID);
1775 break;
1776 case ACPI_BUS_TYPE_POWER_BUTTON:
1777 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1778 break;
1779 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1780 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1781 break;
1782 }
1783 }
1784
1785 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1786 {
1787 struct acpi_hardware_id *id, *tmp;
1788
1789 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1790 kfree(id->id);
1791 kfree(id);
1792 }
1793 kfree(pnp->unique_id);
1794 }
1795
1796 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1797 int type, unsigned long long sta)
1798 {
1799 INIT_LIST_HEAD(&device->pnp.ids);
1800 device->device_type = type;
1801 device->handle = handle;
1802 device->parent = acpi_bus_get_parent(handle);
1803 acpi_set_device_status(device, sta);
1804 acpi_device_get_busid(device);
1805 acpi_set_pnp_ids(handle, &device->pnp, type);
1806 acpi_bus_get_flags(device);
1807 device->flags.match_driver = false;
1808 device->flags.initialized = true;
1809 device->flags.visited = false;
1810 device_initialize(&device->dev);
1811 dev_set_uevent_suppress(&device->dev, true);
1812 }
1813
1814 void acpi_device_add_finalize(struct acpi_device *device)
1815 {
1816 dev_set_uevent_suppress(&device->dev, false);
1817 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1818 }
1819
1820 static int acpi_add_single_object(struct acpi_device **child,
1821 acpi_handle handle, int type,
1822 unsigned long long sta)
1823 {
1824 int result;
1825 struct acpi_device *device;
1826 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1827
1828 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1829 if (!device) {
1830 printk(KERN_ERR PREFIX "Memory allocation error\n");
1831 return -ENOMEM;
1832 }
1833
1834 acpi_init_device_object(device, handle, type, sta);
1835 acpi_bus_get_power_flags(device);
1836 acpi_bus_get_wakeup_device_flags(device);
1837
1838 result = acpi_device_add(device, acpi_device_release);
1839 if (result) {
1840 acpi_device_release(&device->dev);
1841 return result;
1842 }
1843
1844 acpi_power_add_remove_device(device, true);
1845 acpi_device_add_finalize(device);
1846 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1847 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1848 dev_name(&device->dev), (char *) buffer.pointer,
1849 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1850 kfree(buffer.pointer);
1851 *child = device;
1852 return 0;
1853 }
1854
1855 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1856 unsigned long long *sta)
1857 {
1858 acpi_status status;
1859 acpi_object_type acpi_type;
1860
1861 status = acpi_get_type(handle, &acpi_type);
1862 if (ACPI_FAILURE(status))
1863 return -ENODEV;
1864
1865 switch (acpi_type) {
1866 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1867 case ACPI_TYPE_DEVICE:
1868 *type = ACPI_BUS_TYPE_DEVICE;
1869 status = acpi_bus_get_status_handle(handle, sta);
1870 if (ACPI_FAILURE(status))
1871 return -ENODEV;
1872 break;
1873 case ACPI_TYPE_PROCESSOR:
1874 *type = ACPI_BUS_TYPE_PROCESSOR;
1875 status = acpi_bus_get_status_handle(handle, sta);
1876 if (ACPI_FAILURE(status))
1877 return -ENODEV;
1878 break;
1879 case ACPI_TYPE_THERMAL:
1880 *type = ACPI_BUS_TYPE_THERMAL;
1881 *sta = ACPI_STA_DEFAULT;
1882 break;
1883 case ACPI_TYPE_POWER:
1884 *type = ACPI_BUS_TYPE_POWER;
1885 *sta = ACPI_STA_DEFAULT;
1886 break;
1887 default:
1888 return -ENODEV;
1889 }
1890
1891 return 0;
1892 }
1893
1894 bool acpi_device_is_present(struct acpi_device *adev)
1895 {
1896 if (adev->status.present || adev->status.functional)
1897 return true;
1898
1899 adev->flags.initialized = false;
1900 return false;
1901 }
1902
1903 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1904 char *idstr,
1905 const struct acpi_device_id **matchid)
1906 {
1907 const struct acpi_device_id *devid;
1908
1909 for (devid = handler->ids; devid->id[0]; devid++)
1910 if (!strcmp((char *)devid->id, idstr)) {
1911 if (matchid)
1912 *matchid = devid;
1913
1914 return true;
1915 }
1916
1917 return false;
1918 }
1919
1920 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1921 const struct acpi_device_id **matchid)
1922 {
1923 struct acpi_scan_handler *handler;
1924
1925 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1926 if (acpi_scan_handler_matching(handler, idstr, matchid))
1927 return handler;
1928
1929 return NULL;
1930 }
1931
1932 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1933 {
1934 if (!!hotplug->enabled == !!val)
1935 return;
1936
1937 mutex_lock(&acpi_scan_lock);
1938
1939 hotplug->enabled = val;
1940
1941 mutex_unlock(&acpi_scan_lock);
1942 }
1943
1944 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1945 {
1946 struct acpi_device_pnp pnp = {};
1947 struct acpi_hardware_id *hwid;
1948 struct acpi_scan_handler *handler;
1949
1950 INIT_LIST_HEAD(&pnp.ids);
1951 acpi_set_pnp_ids(handle, &pnp, type);
1952
1953 if (!pnp.type.hardware_id)
1954 goto out;
1955
1956 /*
1957 * This relies on the fact that acpi_install_notify_handler() will not
1958 * install the same notify handler routine twice for the same handle.
1959 */
1960 list_for_each_entry(hwid, &pnp.ids, list) {
1961 handler = acpi_scan_match_handler(hwid->id, NULL);
1962 if (handler) {
1963 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1964 acpi_hotplug_notify_cb, handler);
1965 break;
1966 }
1967 }
1968
1969 out:
1970 acpi_free_pnp_ids(&pnp);
1971 }
1972
1973 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1974 void *not_used, void **return_value)
1975 {
1976 struct acpi_device *device = NULL;
1977 int type;
1978 unsigned long long sta;
1979 int result;
1980
1981 acpi_bus_get_device(handle, &device);
1982 if (device)
1983 goto out;
1984
1985 result = acpi_bus_type_and_status(handle, &type, &sta);
1986 if (result)
1987 return AE_OK;
1988
1989 if (type == ACPI_BUS_TYPE_POWER) {
1990 acpi_add_power_resource(handle);
1991 return AE_OK;
1992 }
1993
1994 acpi_scan_init_hotplug(handle, type);
1995
1996 acpi_add_single_object(&device, handle, type, sta);
1997 if (!device)
1998 return AE_CTRL_DEPTH;
1999
2000 out:
2001 if (!*return_value)
2002 *return_value = device;
2003
2004 return AE_OK;
2005 }
2006
2007 static int acpi_scan_attach_handler(struct acpi_device *device)
2008 {
2009 struct acpi_hardware_id *hwid;
2010 int ret = 0;
2011
2012 list_for_each_entry(hwid, &device->pnp.ids, list) {
2013 const struct acpi_device_id *devid;
2014 struct acpi_scan_handler *handler;
2015
2016 handler = acpi_scan_match_handler(hwid->id, &devid);
2017 if (handler) {
2018 ret = handler->attach(device, devid);
2019 if (ret > 0) {
2020 device->handler = handler;
2021 break;
2022 } else if (ret < 0) {
2023 break;
2024 }
2025 }
2026 }
2027 return ret;
2028 }
2029
2030 static void acpi_bus_attach(struct acpi_device *device)
2031 {
2032 struct acpi_device *child;
2033 int ret;
2034
2035 acpi_bus_get_status(device);
2036 /* Skip devices that are not present. */
2037 if (!acpi_device_is_present(device)) {
2038 device->flags.visited = false;
2039 return;
2040 }
2041 if (device->handler)
2042 goto ok;
2043
2044 if (!device->flags.initialized) {
2045 acpi_bus_update_power(device, NULL);
2046 device->flags.initialized = true;
2047 }
2048 device->flags.visited = false;
2049 ret = acpi_scan_attach_handler(device);
2050 if (ret < 0)
2051 return;
2052
2053 device->flags.match_driver = true;
2054 if (!ret) {
2055 ret = device_attach(&device->dev);
2056 if (ret < 0)
2057 return;
2058 }
2059 device->flags.visited = true;
2060
2061 ok:
2062 list_for_each_entry(child, &device->children, node)
2063 acpi_bus_attach(child);
2064 }
2065
2066 /**
2067 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2068 * @handle: Root of the namespace scope to scan.
2069 *
2070 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2071 * found devices.
2072 *
2073 * If no devices were found, -ENODEV is returned, but it does not mean that
2074 * there has been a real error. There just have been no suitable ACPI objects
2075 * in the table trunk from which the kernel could create a device and add an
2076 * appropriate driver.
2077 *
2078 * Must be called under acpi_scan_lock.
2079 */
2080 int acpi_bus_scan(acpi_handle handle)
2081 {
2082 void *device = NULL;
2083
2084 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2085 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2086 acpi_bus_check_add, NULL, NULL, &device);
2087
2088 if (device) {
2089 acpi_bus_attach(device);
2090 return 0;
2091 }
2092 return -ENODEV;
2093 }
2094 EXPORT_SYMBOL(acpi_bus_scan);
2095
2096 /**
2097 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2098 * @adev: Root of the ACPI namespace scope to walk.
2099 *
2100 * Must be called under acpi_scan_lock.
2101 */
2102 void acpi_bus_trim(struct acpi_device *adev)
2103 {
2104 struct acpi_scan_handler *handler = adev->handler;
2105 struct acpi_device *child;
2106
2107 list_for_each_entry_reverse(child, &adev->children, node)
2108 acpi_bus_trim(child);
2109
2110 adev->flags.match_driver = false;
2111 if (handler) {
2112 if (handler->detach)
2113 handler->detach(adev);
2114
2115 adev->handler = NULL;
2116 } else {
2117 device_release_driver(&adev->dev);
2118 }
2119 /*
2120 * Most likely, the device is going away, so put it into D3cold before
2121 * that.
2122 */
2123 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2124 adev->flags.initialized = false;
2125 adev->flags.visited = false;
2126 }
2127 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2128
2129 static int acpi_bus_scan_fixed(void)
2130 {
2131 int result = 0;
2132
2133 /*
2134 * Enumerate all fixed-feature devices.
2135 */
2136 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2137 struct acpi_device *device = NULL;
2138
2139 result = acpi_add_single_object(&device, NULL,
2140 ACPI_BUS_TYPE_POWER_BUTTON,
2141 ACPI_STA_DEFAULT);
2142 if (result)
2143 return result;
2144
2145 device->flags.match_driver = true;
2146 result = device_attach(&device->dev);
2147 if (result < 0)
2148 return result;
2149
2150 device_init_wakeup(&device->dev, true);
2151 }
2152
2153 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2154 struct acpi_device *device = NULL;
2155
2156 result = acpi_add_single_object(&device, NULL,
2157 ACPI_BUS_TYPE_SLEEP_BUTTON,
2158 ACPI_STA_DEFAULT);
2159 if (result)
2160 return result;
2161
2162 device->flags.match_driver = true;
2163 result = device_attach(&device->dev);
2164 }
2165
2166 return result < 0 ? result : 0;
2167 }
2168
2169 int __init acpi_scan_init(void)
2170 {
2171 int result;
2172
2173 result = bus_register(&acpi_bus_type);
2174 if (result) {
2175 /* We don't want to quit even if we failed to add suspend/resume */
2176 printk(KERN_ERR PREFIX "Could not register bus type\n");
2177 }
2178
2179 acpi_pci_root_init();
2180 acpi_pci_link_init();
2181 acpi_processor_init();
2182 acpi_platform_init();
2183 acpi_lpss_init();
2184 acpi_cmos_rtc_init();
2185 acpi_container_init();
2186 acpi_memory_hotplug_init();
2187 acpi_dock_init();
2188
2189 mutex_lock(&acpi_scan_lock);
2190 /*
2191 * Enumerate devices in the ACPI namespace.
2192 */
2193 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2194 if (result)
2195 goto out;
2196
2197 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2198 if (result)
2199 goto out;
2200
2201 result = acpi_bus_scan_fixed();
2202 if (result) {
2203 acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
2204 acpi_device_del(acpi_root);
2205 put_device(&acpi_root->dev);
2206 goto out;
2207 }
2208
2209 acpi_update_all_gpes();
2210
2211 out:
2212 mutex_unlock(&acpi_scan_lock);
2213 return result;
2214 }
Linux with added FPC-III support