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