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