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Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
[linux-2.6.git] / drivers / acpi / scan.c
blob407ad13cac2f27945c3b812f791a4f615c2db492
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_companions(acpi_handle handle, u32 lvl,
129 void *data, 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 mutex_lock(&device->physical_node_lock);
140
141 list_for_each_entry(pn, &device->physical_node_list, node) {
142 int ret;
143
144 if (second_pass) {
145 /* Skip devices offlined by the first pass. */
146 if (pn->put_online)
147 continue;
148 } else {
149 pn->put_online = false;
150 }
151 ret = device_offline(pn->dev);
152 if (acpi_force_hot_remove)
153 continue;
154
155 if (ret >= 0) {
156 pn->put_online = !ret;
157 } else {
158 *ret_p = pn->dev;
159 if (second_pass) {
160 status = AE_ERROR;
161 break;
162 }
163 }
164 }
165
166 mutex_unlock(&device->physical_node_lock);
167
168 return status;
169 }
170
171 static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
172 void *data, void **ret_p)
173 {
174 struct acpi_device *device = NULL;
175 struct acpi_device_physical_node *pn;
176
177 if (acpi_bus_get_device(handle, &device))
178 return AE_OK;
179
180 mutex_lock(&device->physical_node_lock);
181
182 list_for_each_entry(pn, &device->physical_node_list, node)
183 if (pn->put_online) {
184 device_online(pn->dev);
185 pn->put_online = false;
186 }
187
188 mutex_unlock(&device->physical_node_lock);
189
190 return AE_OK;
191 }
192
193 static int acpi_scan_hot_remove(struct acpi_device *device)
194 {
195 acpi_handle handle = device->handle;
196 struct device *errdev;
197 acpi_status status;
198 unsigned long long sta;
199
200 /* If there is no handle, the device node has been unregistered. */
201 if (!handle) {
202 dev_dbg(&device->dev, "ACPI handle missing\n");
203 put_device(&device->dev);
204 return -EINVAL;
205 }
206
207 /*
208 * Carry out two passes here and ignore errors in the first pass,
209 * because if the devices in question are memory blocks and
210 * CONFIG_MEMCG is set, one of the blocks may hold data structures
211 * that the other blocks depend on, but it is not known in advance which
212 * block holds them.
213 *
214 * If the first pass is successful, the second one isn't needed, though.
215 */
216 errdev = NULL;
217 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
218 NULL, acpi_bus_offline_companions,
219 (void *)false, (void **)&errdev);
220 acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
221 if (errdev) {
222 errdev = NULL;
223 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
224 NULL, acpi_bus_offline_companions,
225 (void *)true , (void **)&errdev);
226 if (!errdev || acpi_force_hot_remove)
227 acpi_bus_offline_companions(handle, 0, (void *)true,
228 (void **)&errdev);
229
230 if (errdev && !acpi_force_hot_remove) {
231 dev_warn(errdev, "Offline failed.\n");
232 acpi_bus_online_companions(handle, 0, NULL, NULL);
233 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
234 ACPI_UINT32_MAX,
235 acpi_bus_online_companions, NULL,
236 NULL, NULL);
237 put_device(&device->dev);
238 return -EBUSY;
239 }
240 }
241
242 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
243 "Hot-removing device %s...\n", dev_name(&device->dev)));
244
245 acpi_bus_trim(device);
246
247 /* Device node has been unregistered. */
248 put_device(&device->dev);
249 device = NULL;
250
251 acpi_evaluate_lck(handle, 0);
252 /*
253 * TBD: _EJD support.
254 */
255 status = acpi_evaluate_ej0(handle);
256 if (status == AE_NOT_FOUND)
257 return -ENODEV;
258 else if (ACPI_FAILURE(status))
259 return -EIO;
260
261 /*
262 * Verify if eject was indeed successful. If not, log an error
263 * message. No need to call _OST since _EJ0 call was made OK.
264 */
265 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
266 if (ACPI_FAILURE(status)) {
267 acpi_handle_warn(handle,
268 "Status check after eject failed (0x%x)\n", status);
269 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
270 acpi_handle_warn(handle,
271 "Eject incomplete - status 0x%llx\n", sta);
272 }
273
274 return 0;
275 }
276
277 static void acpi_bus_device_eject(void *context)
278 {
279 acpi_handle handle = context;
280 struct acpi_device *device = NULL;
281 struct acpi_scan_handler *handler;
282 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
283 int error;
284
285 lock_device_hotplug();
286 mutex_lock(&acpi_scan_lock);
287
288 acpi_bus_get_device(handle, &device);
289 if (!device)
290 goto err_out;
291
292 handler = device->handler;
293 if (!handler || !handler->hotplug.enabled) {
294 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
295 goto err_out;
296 }
297 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
298 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
299 if (handler->hotplug.mode == AHM_CONTAINER)
300 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
301
302 get_device(&device->dev);
303 error = acpi_scan_hot_remove(device);
304 if (error)
305 goto err_out;
306
307 out:
308 mutex_unlock(&acpi_scan_lock);
309 unlock_device_hotplug();
310 return;
311
312 err_out:
313 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
314 NULL);
315 goto out;
316 }
317
318 static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
319 {
320 struct acpi_device *device = NULL;
321 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
322 int error;
323
324 lock_device_hotplug();
325 mutex_lock(&acpi_scan_lock);
326
327 if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
328 acpi_bus_get_device(handle, &device);
329 if (device) {
330 dev_warn(&device->dev, "Attempt to re-insert\n");
331 goto out;
332 }
333 }
334 acpi_evaluate_hotplug_ost(handle, ost_source,
335 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
336 error = acpi_bus_scan(handle);
337 if (error) {
338 acpi_handle_warn(handle, "Namespace scan failure\n");
339 goto out;
340 }
341 error = acpi_bus_get_device(handle, &device);
342 if (error) {
343 acpi_handle_warn(handle, "Missing device node object\n");
344 goto out;
345 }
346 ost_code = ACPI_OST_SC_SUCCESS;
347 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
348 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
349
350 out:
351 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
352 mutex_unlock(&acpi_scan_lock);
353 unlock_device_hotplug();
354 }
355
356 static void acpi_scan_bus_check(void *context)
357 {
358 acpi_scan_bus_device_check((acpi_handle)context,
359 ACPI_NOTIFY_BUS_CHECK);
360 }
361
362 static void acpi_scan_device_check(void *context)
363 {
364 acpi_scan_bus_device_check((acpi_handle)context,
365 ACPI_NOTIFY_DEVICE_CHECK);
366 }
367
368 static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
369 {
370 u32 ost_status;
371
372 switch (type) {
373 case ACPI_NOTIFY_BUS_CHECK:
374 acpi_handle_debug(handle,
375 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
376 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
377 break;
378 case ACPI_NOTIFY_DEVICE_CHECK:
379 acpi_handle_debug(handle,
380 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
381 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
382 break;
383 case ACPI_NOTIFY_EJECT_REQUEST:
384 acpi_handle_debug(handle,
385 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
386 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
387 break;
388 default:
389 /* non-hotplug event; possibly handled by other handler */
390 return;
391 }
392
393 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
394 }
395
396 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
397 {
398 acpi_osd_exec_callback callback;
399 struct acpi_scan_handler *handler = data;
400 acpi_status status;
401
402 if (!handler->hotplug.enabled)
403 return acpi_hotplug_unsupported(handle, type);
404
405 switch (type) {
406 case ACPI_NOTIFY_BUS_CHECK:
407 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
408 callback = acpi_scan_bus_check;
409 break;
410 case ACPI_NOTIFY_DEVICE_CHECK:
411 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
412 callback = acpi_scan_device_check;
413 break;
414 case ACPI_NOTIFY_EJECT_REQUEST:
415 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
416 callback = acpi_bus_device_eject;
417 break;
418 default:
419 /* non-hotplug event; possibly handled by other handler */
420 return;
421 }
422 status = acpi_os_hotplug_execute(callback, handle);
423 if (ACPI_FAILURE(status))
424 acpi_evaluate_hotplug_ost(handle, type,
425 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
426 NULL);
427 }
428
429 /**
430 * acpi_bus_hot_remove_device: hot-remove a device and its children
431 * @context: struct acpi_eject_event pointer (freed in this func)
432 *
433 * Hot-remove a device and its children. This function frees up the
434 * memory space passed by arg context, so that the caller may call
435 * this function asynchronously through acpi_os_hotplug_execute().
436 */
437 void acpi_bus_hot_remove_device(void *context)
438 {
439 struct acpi_eject_event *ej_event = context;
440 struct acpi_device *device = ej_event->device;
441 acpi_handle handle = device->handle;
442 int error;
443
444 lock_device_hotplug();
445 mutex_lock(&acpi_scan_lock);
446
447 error = acpi_scan_hot_remove(device);
448 if (error && handle)
449 acpi_evaluate_hotplug_ost(handle, ej_event->event,
450 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
451 NULL);
452
453 mutex_unlock(&acpi_scan_lock);
454 unlock_device_hotplug();
455 kfree(context);
456 }
457 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
458
459 static ssize_t real_power_state_show(struct device *dev,
460 struct device_attribute *attr, char *buf)
461 {
462 struct acpi_device *adev = to_acpi_device(dev);
463 int state;
464 int ret;
465
466 ret = acpi_device_get_power(adev, &state);
467 if (ret)
468 return ret;
469
470 return sprintf(buf, "%s\n", acpi_power_state_string(state));
471 }
472
473 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
474
475 static ssize_t power_state_show(struct device *dev,
476 struct device_attribute *attr, char *buf)
477 {
478 struct acpi_device *adev = to_acpi_device(dev);
479
480 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
481 }
482
483 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
484
485 static ssize_t
486 acpi_eject_store(struct device *d, struct device_attribute *attr,
487 const char *buf, size_t count)
488 {
489 struct acpi_device *acpi_device = to_acpi_device(d);
490 struct acpi_eject_event *ej_event;
491 acpi_object_type not_used;
492 acpi_status status;
493 int ret;
494
495 if (!count || buf[0] != '1')
496 return -EINVAL;
497
498 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
499 && !acpi_device->driver)
500 return -ENODEV;
501
502 status = acpi_get_type(acpi_device->handle, &not_used);
503 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
504 return -ENODEV;
505
506 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
507 if (!ej_event) {
508 ret = -ENOMEM;
509 goto err_out;
510 }
511 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
512 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
513 ej_event->device = acpi_device;
514 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
515 get_device(&acpi_device->dev);
516 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
517 if (ACPI_SUCCESS(status))
518 return count;
519
520 put_device(&acpi_device->dev);
521 kfree(ej_event);
522 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
523
524 err_out:
525 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
526 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
527 return ret;
528 }
529
530 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
531
532 static ssize_t
533 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
534 struct acpi_device *acpi_dev = to_acpi_device(dev);
535
536 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
537 }
538 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
539
540 static ssize_t acpi_device_uid_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
542 {
543 struct acpi_device *acpi_dev = to_acpi_device(dev);
544
545 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
546 }
547 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
548
549 static ssize_t acpi_device_adr_show(struct device *dev,
550 struct device_attribute *attr, char *buf)
551 {
552 struct acpi_device *acpi_dev = to_acpi_device(dev);
553
554 return sprintf(buf, "0x%08x\n",
555 (unsigned int)(acpi_dev->pnp.bus_address));
556 }
557 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
558
559 static ssize_t
560 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
561 struct acpi_device *acpi_dev = to_acpi_device(dev);
562 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
563 int result;
564
565 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
566 if (result)
567 goto end;
568
569 result = sprintf(buf, "%s\n", (char*)path.pointer);
570 kfree(path.pointer);
571 end:
572 return result;
573 }
574 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
575
576 /* sysfs file that shows description text from the ACPI _STR method */
577 static ssize_t description_show(struct device *dev,
578 struct device_attribute *attr,
579 char *buf) {
580 struct acpi_device *acpi_dev = to_acpi_device(dev);
581 int result;
582
583 if (acpi_dev->pnp.str_obj == NULL)
584 return 0;
585
586 /*
587 * The _STR object contains a Unicode identifier for a device.
588 * We need to convert to utf-8 so it can be displayed.
589 */
590 result = utf16s_to_utf8s(
591 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
592 acpi_dev->pnp.str_obj->buffer.length,
593 UTF16_LITTLE_ENDIAN, buf,
594 PAGE_SIZE);
595
596 buf[result++] = '\n';
597
598 return result;
599 }
600 static DEVICE_ATTR(description, 0444, description_show, NULL);
601
602 static ssize_t
603 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
604 char *buf) {
605 struct acpi_device *acpi_dev = to_acpi_device(dev);
606
607 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
608 }
609 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
610
611 static int acpi_device_setup_files(struct acpi_device *dev)
612 {
613 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
614 acpi_status status;
615 unsigned long long sun;
616 int result = 0;
617
618 /*
619 * Devices gotten from FADT don't have a "path" attribute
620 */
621 if (dev->handle) {
622 result = device_create_file(&dev->dev, &dev_attr_path);
623 if (result)
624 goto end;
625 }
626
627 if (!list_empty(&dev->pnp.ids)) {
628 result = device_create_file(&dev->dev, &dev_attr_hid);
629 if (result)
630 goto end;
631
632 result = device_create_file(&dev->dev, &dev_attr_modalias);
633 if (result)
634 goto end;
635 }
636
637 /*
638 * If device has _STR, 'description' file is created
639 */
640 if (acpi_has_method(dev->handle, "_STR")) {
641 status = acpi_evaluate_object(dev->handle, "_STR",
642 NULL, &buffer);
643 if (ACPI_FAILURE(status))
644 buffer.pointer = NULL;
645 dev->pnp.str_obj = buffer.pointer;
646 result = device_create_file(&dev->dev, &dev_attr_description);
647 if (result)
648 goto end;
649 }
650
651 if (dev->pnp.type.bus_address)
652 result = device_create_file(&dev->dev, &dev_attr_adr);
653 if (dev->pnp.unique_id)
654 result = device_create_file(&dev->dev, &dev_attr_uid);
655
656 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
657 if (ACPI_SUCCESS(status)) {
658 dev->pnp.sun = (unsigned long)sun;
659 result = device_create_file(&dev->dev, &dev_attr_sun);
660 if (result)
661 goto end;
662 } else {
663 dev->pnp.sun = (unsigned long)-1;
664 }
665
666 /*
667 * If device has _EJ0, 'eject' file is created that is used to trigger
668 * hot-removal function from userland.
669 */
670 if (acpi_has_method(dev->handle, "_EJ0")) {
671 result = device_create_file(&dev->dev, &dev_attr_eject);
672 if (result)
673 return result;
674 }
675
676 if (dev->flags.power_manageable) {
677 result = device_create_file(&dev->dev, &dev_attr_power_state);
678 if (result)
679 return result;
680
681 if (dev->power.flags.power_resources)
682 result = device_create_file(&dev->dev,
683 &dev_attr_real_power_state);
684 }
685
686 end:
687 return result;
688 }
689
690 static void acpi_device_remove_files(struct acpi_device *dev)
691 {
692 if (dev->flags.power_manageable) {
693 device_remove_file(&dev->dev, &dev_attr_power_state);
694 if (dev->power.flags.power_resources)
695 device_remove_file(&dev->dev,
696 &dev_attr_real_power_state);
697 }
698
699 /*
700 * If device has _STR, remove 'description' file
701 */
702 if (acpi_has_method(dev->handle, "_STR")) {
703 kfree(dev->pnp.str_obj);
704 device_remove_file(&dev->dev, &dev_attr_description);
705 }
706 /*
707 * If device has _EJ0, remove 'eject' file.
708 */
709 if (acpi_has_method(dev->handle, "_EJ0"))
710 device_remove_file(&dev->dev, &dev_attr_eject);
711
712 if (acpi_has_method(dev->handle, "_SUN"))
713 device_remove_file(&dev->dev, &dev_attr_sun);
714
715 if (dev->pnp.unique_id)
716 device_remove_file(&dev->dev, &dev_attr_uid);
717 if (dev->pnp.type.bus_address)
718 device_remove_file(&dev->dev, &dev_attr_adr);
719 device_remove_file(&dev->dev, &dev_attr_modalias);
720 device_remove_file(&dev->dev, &dev_attr_hid);
721 if (dev->handle)
722 device_remove_file(&dev->dev, &dev_attr_path);
723 }
724 /* --------------------------------------------------------------------------
725 ACPI Bus operations
726 -------------------------------------------------------------------------- */
727
728 static const struct acpi_device_id *__acpi_match_device(
729 struct acpi_device *device, const struct acpi_device_id *ids)
730 {
731 const struct acpi_device_id *id;
732 struct acpi_hardware_id *hwid;
733
734 /*
735 * If the device is not present, it is unnecessary to load device
736 * driver for it.
737 */
738 if (!device->status.present)
739 return NULL;
740
741 for (id = ids; id->id[0]; id++)
742 list_for_each_entry(hwid, &device->pnp.ids, list)
743 if (!strcmp((char *) id->id, hwid->id))
744 return id;
745
746 return NULL;
747 }
748
749 /**
750 * acpi_match_device - Match a struct device against a given list of ACPI IDs
751 * @ids: Array of struct acpi_device_id object to match against.
752 * @dev: The device structure to match.
753 *
754 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
755 * object for that handle and use that object to match against a given list of
756 * device IDs.
757 *
758 * Return a pointer to the first matching ID on success or %NULL on failure.
759 */
760 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
761 const struct device *dev)
762 {
763 struct acpi_device *adev;
764 acpi_handle handle = ACPI_HANDLE(dev);
765
766 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
767 return NULL;
768
769 return __acpi_match_device(adev, ids);
770 }
771 EXPORT_SYMBOL_GPL(acpi_match_device);
772
773 int acpi_match_device_ids(struct acpi_device *device,
774 const struct acpi_device_id *ids)
775 {
776 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
777 }
778 EXPORT_SYMBOL(acpi_match_device_ids);
779
780 static void acpi_free_power_resources_lists(struct acpi_device *device)
781 {
782 int i;
783
784 if (device->wakeup.flags.valid)
785 acpi_power_resources_list_free(&device->wakeup.resources);
786
787 if (!device->flags.power_manageable)
788 return;
789
790 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
791 struct acpi_device_power_state *ps = &device->power.states[i];
792 acpi_power_resources_list_free(&ps->resources);
793 }
794 }
795
796 static void acpi_device_release(struct device *dev)
797 {
798 struct acpi_device *acpi_dev = to_acpi_device(dev);
799
800 acpi_free_pnp_ids(&acpi_dev->pnp);
801 acpi_free_power_resources_lists(acpi_dev);
802 kfree(acpi_dev);
803 }
804
805 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
806 {
807 struct acpi_device *acpi_dev = to_acpi_device(dev);
808 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
809
810 return acpi_dev->flags.match_driver
811 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
812 }
813
814 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
815 {
816 struct acpi_device *acpi_dev = to_acpi_device(dev);
817 int len;
818
819 if (list_empty(&acpi_dev->pnp.ids))
820 return 0;
821
822 if (add_uevent_var(env, "MODALIAS="))
823 return -ENOMEM;
824 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
825 sizeof(env->buf) - env->buflen);
826 if (len >= (sizeof(env->buf) - env->buflen))
827 return -ENOMEM;
828 env->buflen += len;
829 return 0;
830 }
831
832 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
833 {
834 struct acpi_device *device = data;
835
836 device->driver->ops.notify(device, event);
837 }
838
839 static acpi_status acpi_device_notify_fixed(void *data)
840 {
841 struct acpi_device *device = data;
842
843 /* Fixed hardware devices have no handles */
844 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
845 return AE_OK;
846 }
847
848 static int acpi_device_install_notify_handler(struct acpi_device *device)
849 {
850 acpi_status status;
851
852 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
853 status =
854 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
855 acpi_device_notify_fixed,
856 device);
857 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
858 status =
859 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
860 acpi_device_notify_fixed,
861 device);
862 else
863 status = acpi_install_notify_handler(device->handle,
864 ACPI_DEVICE_NOTIFY,
865 acpi_device_notify,
866 device);
867
868 if (ACPI_FAILURE(status))
869 return -EINVAL;
870 return 0;
871 }
872
873 static void acpi_device_remove_notify_handler(struct acpi_device *device)
874 {
875 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
876 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
877 acpi_device_notify_fixed);
878 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
879 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
880 acpi_device_notify_fixed);
881 else
882 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
883 acpi_device_notify);
884 }
885
886 static int acpi_device_probe(struct device *dev)
887 {
888 struct acpi_device *acpi_dev = to_acpi_device(dev);
889 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
890 int ret;
891
892 if (acpi_dev->handler)
893 return -EINVAL;
894
895 if (!acpi_drv->ops.add)
896 return -ENOSYS;
897
898 ret = acpi_drv->ops.add(acpi_dev);
899 if (ret)
900 return ret;
901
902 acpi_dev->driver = acpi_drv;
903 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
904 "Driver [%s] successfully bound to device [%s]\n",
905 acpi_drv->name, acpi_dev->pnp.bus_id));
906
907 if (acpi_drv->ops.notify) {
908 ret = acpi_device_install_notify_handler(acpi_dev);
909 if (ret) {
910 if (acpi_drv->ops.remove)
911 acpi_drv->ops.remove(acpi_dev);
912
913 acpi_dev->driver = NULL;
914 acpi_dev->driver_data = NULL;
915 return ret;
916 }
917 }
918
919 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
920 acpi_drv->name, acpi_dev->pnp.bus_id));
921 get_device(dev);
922 return 0;
923 }
924
925 static int acpi_device_remove(struct device * dev)
926 {
927 struct acpi_device *acpi_dev = to_acpi_device(dev);
928 struct acpi_driver *acpi_drv = acpi_dev->driver;
929
930 if (acpi_drv) {
931 if (acpi_drv->ops.notify)
932 acpi_device_remove_notify_handler(acpi_dev);
933 if (acpi_drv->ops.remove)
934 acpi_drv->ops.remove(acpi_dev);
935 }
936 acpi_dev->driver = NULL;
937 acpi_dev->driver_data = NULL;
938
939 put_device(dev);
940 return 0;
941 }
942
943 struct bus_type acpi_bus_type = {
944 .name = "acpi",
945 .match = acpi_bus_match,
946 .probe = acpi_device_probe,
947 .remove = acpi_device_remove,
948 .uevent = acpi_device_uevent,
949 };
950
951 static void acpi_bus_data_handler(acpi_handle handle, void *context)
952 {
953 /* Intentionally empty. */
954 }
955
956 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
957 {
958 acpi_status status;
959
960 if (!device)
961 return -EINVAL;
962
963 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
964 if (ACPI_FAILURE(status) || !*device) {
965 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
966 handle));
967 return -ENODEV;
968 }
969 return 0;
970 }
971 EXPORT_SYMBOL(acpi_bus_get_device);
972
973 int acpi_device_add(struct acpi_device *device,
974 void (*release)(struct device *))
975 {
976 int result;
977 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
978 int found = 0;
979
980 if (device->handle) {
981 acpi_status status;
982
983 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
984 device);
985 if (ACPI_FAILURE(status)) {
986 acpi_handle_err(device->handle,
987 "Unable to attach device data\n");
988 return -ENODEV;
989 }
990 }
991
992 /*
993 * Linkage
994 * -------
995 * Link this device to its parent and siblings.
996 */
997 INIT_LIST_HEAD(&device->children);
998 INIT_LIST_HEAD(&device->node);
999 INIT_LIST_HEAD(&device->wakeup_list);
1000 INIT_LIST_HEAD(&device->physical_node_list);
1001 mutex_init(&device->physical_node_lock);
1002 INIT_LIST_HEAD(&device->power_dependent);
1003
1004 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1005 if (!new_bus_id) {
1006 pr_err(PREFIX "Memory allocation error\n");
1007 result = -ENOMEM;
1008 goto err_detach;
1009 }
1010
1011 mutex_lock(&acpi_device_lock);
1012 /*
1013 * Find suitable bus_id and instance number in acpi_bus_id_list
1014 * If failed, create one and link it into acpi_bus_id_list
1015 */
1016 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1017 if (!strcmp(acpi_device_bus_id->bus_id,
1018 acpi_device_hid(device))) {
1019 acpi_device_bus_id->instance_no++;
1020 found = 1;
1021 kfree(new_bus_id);
1022 break;
1023 }
1024 }
1025 if (!found) {
1026 acpi_device_bus_id = new_bus_id;
1027 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1028 acpi_device_bus_id->instance_no = 0;
1029 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1030 }
1031 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1032
1033 if (device->parent)
1034 list_add_tail(&device->node, &device->parent->children);
1035
1036 if (device->wakeup.flags.valid)
1037 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1038 mutex_unlock(&acpi_device_lock);
1039
1040 if (device->parent)
1041 device->dev.parent = &device->parent->dev;
1042 device->dev.bus = &acpi_bus_type;
1043 device->dev.release = release;
1044 result = device_add(&device->dev);
1045 if (result) {
1046 dev_err(&device->dev, "Error registering device\n");
1047 goto err;
1048 }
1049
1050 result = acpi_device_setup_files(device);
1051 if (result)
1052 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1053 dev_name(&device->dev));
1054
1055 return 0;
1056
1057 err:
1058 mutex_lock(&acpi_device_lock);
1059 if (device->parent)
1060 list_del(&device->node);
1061 list_del(&device->wakeup_list);
1062 mutex_unlock(&acpi_device_lock);
1063
1064 err_detach:
1065 acpi_detach_data(device->handle, acpi_bus_data_handler);
1066 return result;
1067 }
1068
1069 static void acpi_device_unregister(struct acpi_device *device)
1070 {
1071 mutex_lock(&acpi_device_lock);
1072 if (device->parent)
1073 list_del(&device->node);
1074
1075 list_del(&device->wakeup_list);
1076 mutex_unlock(&acpi_device_lock);
1077
1078 acpi_detach_data(device->handle, acpi_bus_data_handler);
1079
1080 acpi_power_add_remove_device(device, false);
1081 acpi_device_remove_files(device);
1082 if (device->remove)
1083 device->remove(device);
1084
1085 device_del(&device->dev);
1086 /*
1087 * Transition the device to D3cold to drop the reference counts of all
1088 * power resources the device depends on and turn off the ones that have
1089 * no more references.
1090 */
1091 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1092 device->handle = NULL;
1093 put_device(&device->dev);
1094 }
1095
1096 /* --------------------------------------------------------------------------
1097 Driver Management
1098 -------------------------------------------------------------------------- */
1099 /**
1100 * acpi_bus_register_driver - register a driver with the ACPI bus
1101 * @driver: driver being registered
1102 *
1103 * Registers a driver with the ACPI bus. Searches the namespace for all
1104 * devices that match the driver's criteria and binds. Returns zero for
1105 * success or a negative error status for failure.
1106 */
1107 int acpi_bus_register_driver(struct acpi_driver *driver)
1108 {
1109 int ret;
1110
1111 if (acpi_disabled)
1112 return -ENODEV;
1113 driver->drv.name = driver->name;
1114 driver->drv.bus = &acpi_bus_type;
1115 driver->drv.owner = driver->owner;
1116
1117 ret = driver_register(&driver->drv);
1118 return ret;
1119 }
1120
1121 EXPORT_SYMBOL(acpi_bus_register_driver);
1122
1123 /**
1124 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1125 * @driver: driver to unregister
1126 *
1127 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1128 * devices that match the driver's criteria and unbinds.
1129 */
1130 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1131 {
1132 driver_unregister(&driver->drv);
1133 }
1134
1135 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1136
1137 /* --------------------------------------------------------------------------
1138 Device Enumeration
1139 -------------------------------------------------------------------------- */
1140 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1141 {
1142 struct acpi_device *device = NULL;
1143 acpi_status status;
1144
1145 /*
1146 * Fixed hardware devices do not appear in the namespace and do not
1147 * have handles, but we fabricate acpi_devices for them, so we have
1148 * to deal with them specially.
1149 */
1150 if (!handle)
1151 return acpi_root;
1152
1153 do {
1154 status = acpi_get_parent(handle, &handle);
1155 if (ACPI_FAILURE(status))
1156 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1157 } while (acpi_bus_get_device(handle, &device));
1158 return device;
1159 }
1160
1161 acpi_status
1162 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1163 {
1164 acpi_status status;
1165 acpi_handle tmp;
1166 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1167 union acpi_object *obj;
1168
1169 status = acpi_get_handle(handle, "_EJD", &tmp);
1170 if (ACPI_FAILURE(status))
1171 return status;
1172
1173 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1174 if (ACPI_SUCCESS(status)) {
1175 obj = buffer.pointer;
1176 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1177 ejd);
1178 kfree(buffer.pointer);
1179 }
1180 return status;
1181 }
1182 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1183
1184 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1185 struct acpi_device_wakeup *wakeup)
1186 {
1187 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1188 union acpi_object *package = NULL;
1189 union acpi_object *element = NULL;
1190 acpi_status status;
1191 int err = -ENODATA;
1192
1193 if (!wakeup)
1194 return -EINVAL;
1195
1196 INIT_LIST_HEAD(&wakeup->resources);
1197
1198 /* _PRW */
1199 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1200 if (ACPI_FAILURE(status)) {
1201 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1202 return err;
1203 }
1204
1205 package = (union acpi_object *)buffer.pointer;
1206
1207 if (!package || package->package.count < 2)
1208 goto out;
1209
1210 element = &(package->package.elements[0]);
1211 if (!element)
1212 goto out;
1213
1214 if (element->type == ACPI_TYPE_PACKAGE) {
1215 if ((element->package.count < 2) ||
1216 (element->package.elements[0].type !=
1217 ACPI_TYPE_LOCAL_REFERENCE)
1218 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1219 goto out;
1220
1221 wakeup->gpe_device =
1222 element->package.elements[0].reference.handle;
1223 wakeup->gpe_number =
1224 (u32) element->package.elements[1].integer.value;
1225 } else if (element->type == ACPI_TYPE_INTEGER) {
1226 wakeup->gpe_device = NULL;
1227 wakeup->gpe_number = element->integer.value;
1228 } else {
1229 goto out;
1230 }
1231
1232 element = &(package->package.elements[1]);
1233 if (element->type != ACPI_TYPE_INTEGER)
1234 goto out;
1235
1236 wakeup->sleep_state = element->integer.value;
1237
1238 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1239 if (err)
1240 goto out;
1241
1242 if (!list_empty(&wakeup->resources)) {
1243 int sleep_state;
1244
1245 err = acpi_power_wakeup_list_init(&wakeup->resources,
1246 &sleep_state);
1247 if (err) {
1248 acpi_handle_warn(handle, "Retrieving current states "
1249 "of wakeup power resources failed\n");
1250 acpi_power_resources_list_free(&wakeup->resources);
1251 goto out;
1252 }
1253 if (sleep_state < wakeup->sleep_state) {
1254 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1255 "(S%d) by S%d from power resources\n",
1256 (int)wakeup->sleep_state, sleep_state);
1257 wakeup->sleep_state = sleep_state;
1258 }
1259 }
1260 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1261
1262 out:
1263 kfree(buffer.pointer);
1264 return err;
1265 }
1266
1267 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1268 {
1269 struct acpi_device_id button_device_ids[] = {
1270 {"PNP0C0C", 0},
1271 {"PNP0C0D", 0},
1272 {"PNP0C0E", 0},
1273 {"", 0},
1274 };
1275 acpi_status status;
1276 acpi_event_status event_status;
1277
1278 device->wakeup.flags.notifier_present = 0;
1279
1280 /* Power button, Lid switch always enable wakeup */
1281 if (!acpi_match_device_ids(device, button_device_ids)) {
1282 device->wakeup.flags.run_wake = 1;
1283 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1284 /* Do not use Lid/sleep button for S5 wakeup */
1285 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1286 device->wakeup.sleep_state = ACPI_STATE_S4;
1287 }
1288 device_set_wakeup_capable(&device->dev, true);
1289 return;
1290 }
1291
1292 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1293 device->wakeup.gpe_number,
1294 &event_status);
1295 if (status == AE_OK)
1296 device->wakeup.flags.run_wake =
1297 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1298 }
1299
1300 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1301 {
1302 int err;
1303
1304 /* Presence of _PRW indicates wake capable */
1305 if (!acpi_has_method(device->handle, "_PRW"))
1306 return;
1307
1308 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1309 &device->wakeup);
1310 if (err) {
1311 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1312 return;
1313 }
1314
1315 device->wakeup.flags.valid = 1;
1316 device->wakeup.prepare_count = 0;
1317 acpi_bus_set_run_wake_flags(device);
1318 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1319 * system for the ACPI device with the _PRW object.
1320 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1321 * So it is necessary to call _DSW object first. Only when it is not
1322 * present will the _PSW object used.
1323 */
1324 err = acpi_device_sleep_wake(device, 0, 0, 0);
1325 if (err)
1326 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1327 "error in _DSW or _PSW evaluation\n"));
1328 }
1329
1330 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1331 {
1332 struct acpi_device_power_state *ps = &device->power.states[state];
1333 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1334 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1335 acpi_status status;
1336
1337 INIT_LIST_HEAD(&ps->resources);
1338
1339 /* Evaluate "_PRx" to get referenced power resources */
1340 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1341 if (ACPI_SUCCESS(status)) {
1342 union acpi_object *package = buffer.pointer;
1343
1344 if (buffer.length && package
1345 && package->type == ACPI_TYPE_PACKAGE
1346 && package->package.count) {
1347 int err = acpi_extract_power_resources(package, 0,
1348 &ps->resources);
1349 if (!err)
1350 device->power.flags.power_resources = 1;
1351 }
1352 ACPI_FREE(buffer.pointer);
1353 }
1354
1355 /* Evaluate "_PSx" to see if we can do explicit sets */
1356 pathname[2] = 'S';
1357 if (acpi_has_method(device->handle, pathname))
1358 ps->flags.explicit_set = 1;
1359
1360 /*
1361 * State is valid if there are means to put the device into it.
1362 * D3hot is only valid if _PR3 present.
1363 */
1364 if (!list_empty(&ps->resources)
1365 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1366 ps->flags.valid = 1;
1367 ps->flags.os_accessible = 1;
1368 }
1369
1370 ps->power = -1; /* Unknown - driver assigned */
1371 ps->latency = -1; /* Unknown - driver assigned */
1372 }
1373
1374 static void acpi_bus_get_power_flags(struct acpi_device *device)
1375 {
1376 u32 i;
1377
1378 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1379 if (!acpi_has_method(device->handle, "_PS0") &&
1380 !acpi_has_method(device->handle, "_PR0"))
1381 return;
1382
1383 device->flags.power_manageable = 1;
1384
1385 /*
1386 * Power Management Flags
1387 */
1388 if (acpi_has_method(device->handle, "_PSC"))
1389 device->power.flags.explicit_get = 1;
1390 if (acpi_has_method(device->handle, "_IRC"))
1391 device->power.flags.inrush_current = 1;
1392
1393 /*
1394 * Enumerate supported power management states
1395 */
1396 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1397 acpi_bus_init_power_state(device, i);
1398
1399 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1400
1401 /* Set defaults for D0 and D3 states (always valid) */
1402 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1403 device->power.states[ACPI_STATE_D0].power = 100;
1404 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1405 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1406
1407 /* Set D3cold's explicit_set flag if _PS3 exists. */
1408 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1409 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1410
1411 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1412 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1413 device->power.flags.power_resources)
1414 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1415
1416 if (acpi_bus_init_power(device)) {
1417 acpi_free_power_resources_lists(device);
1418 device->flags.power_manageable = 0;
1419 }
1420 }
1421
1422 static void acpi_bus_get_flags(struct acpi_device *device)
1423 {
1424 /* Presence of _STA indicates 'dynamic_status' */
1425 if (acpi_has_method(device->handle, "_STA"))
1426 device->flags.dynamic_status = 1;
1427
1428 /* Presence of _RMV indicates 'removable' */
1429 if (acpi_has_method(device->handle, "_RMV"))
1430 device->flags.removable = 1;
1431
1432 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1433 if (acpi_has_method(device->handle, "_EJD") ||
1434 acpi_has_method(device->handle, "_EJ0"))
1435 device->flags.ejectable = 1;
1436 }
1437
1438 static void acpi_device_get_busid(struct acpi_device *device)
1439 {
1440 char bus_id[5] = { '?', 0 };
1441 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1442 int i = 0;
1443
1444 /*
1445 * Bus ID
1446 * ------
1447 * The device's Bus ID is simply the object name.
1448 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1449 */
1450 if (ACPI_IS_ROOT_DEVICE(device)) {
1451 strcpy(device->pnp.bus_id, "ACPI");
1452 return;
1453 }
1454
1455 switch (device->device_type) {
1456 case ACPI_BUS_TYPE_POWER_BUTTON:
1457 strcpy(device->pnp.bus_id, "PWRF");
1458 break;
1459 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1460 strcpy(device->pnp.bus_id, "SLPF");
1461 break;
1462 default:
1463 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1464 /* Clean up trailing underscores (if any) */
1465 for (i = 3; i > 1; i--) {
1466 if (bus_id[i] == '_')
1467 bus_id[i] = '\0';
1468 else
1469 break;
1470 }
1471 strcpy(device->pnp.bus_id, bus_id);
1472 break;
1473 }
1474 }
1475
1476 /*
1477 * acpi_ata_match - see if an acpi object is an ATA device
1478 *
1479 * If an acpi object has one of the ACPI ATA methods defined,
1480 * then we can safely call it an ATA device.
1481 */
1482 bool acpi_ata_match(acpi_handle handle)
1483 {
1484 return acpi_has_method(handle, "_GTF") ||
1485 acpi_has_method(handle, "_GTM") ||
1486 acpi_has_method(handle, "_STM") ||
1487 acpi_has_method(handle, "_SDD");
1488 }
1489
1490 /*
1491 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1492 *
1493 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1494 * then we can safely call it an ejectable drive bay
1495 */
1496 bool acpi_bay_match(acpi_handle handle)
1497 {
1498 acpi_handle phandle;
1499
1500 if (!acpi_has_method(handle, "_EJ0"))
1501 return false;
1502 if (acpi_ata_match(handle))
1503 return true;
1504 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1505 return false;
1506
1507 return acpi_ata_match(phandle);
1508 }
1509
1510 /*
1511 * acpi_dock_match - see if an acpi object has a _DCK method
1512 */
1513 bool acpi_dock_match(acpi_handle handle)
1514 {
1515 return acpi_has_method(handle, "_DCK");
1516 }
1517
1518 const char *acpi_device_hid(struct acpi_device *device)
1519 {
1520 struct acpi_hardware_id *hid;
1521
1522 if (list_empty(&device->pnp.ids))
1523 return dummy_hid;
1524
1525 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1526 return hid->id;
1527 }
1528 EXPORT_SYMBOL(acpi_device_hid);
1529
1530 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1531 {
1532 struct acpi_hardware_id *id;
1533
1534 id = kmalloc(sizeof(*id), GFP_KERNEL);
1535 if (!id)
1536 return;
1537
1538 id->id = kstrdup(dev_id, GFP_KERNEL);
1539 if (!id->id) {
1540 kfree(id);
1541 return;
1542 }
1543
1544 list_add_tail(&id->list, &pnp->ids);
1545 pnp->type.hardware_id = 1;
1546 }
1547
1548 /*
1549 * Old IBM workstations have a DSDT bug wherein the SMBus object
1550 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1551 * prefix. Work around this.
1552 */
1553 static bool acpi_ibm_smbus_match(acpi_handle handle)
1554 {
1555 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1556 struct acpi_buffer path = { sizeof(node_name), node_name };
1557
1558 if (!dmi_name_in_vendors("IBM"))
1559 return false;
1560
1561 /* Look for SMBS object */
1562 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1563 strcmp("SMBS", path.pointer))
1564 return false;
1565
1566 /* Does it have the necessary (but misnamed) methods? */
1567 if (acpi_has_method(handle, "SBI") &&
1568 acpi_has_method(handle, "SBR") &&
1569 acpi_has_method(handle, "SBW"))
1570 return true;
1571
1572 return false;
1573 }
1574
1575 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1576 int device_type)
1577 {
1578 acpi_status status;
1579 struct acpi_device_info *info;
1580 struct acpi_pnp_device_id_list *cid_list;
1581 int i;
1582
1583 switch (device_type) {
1584 case ACPI_BUS_TYPE_DEVICE:
1585 if (handle == ACPI_ROOT_OBJECT) {
1586 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1587 break;
1588 }
1589
1590 status = acpi_get_object_info(handle, &info);
1591 if (ACPI_FAILURE(status)) {
1592 pr_err(PREFIX "%s: Error reading device info\n",
1593 __func__);
1594 return;
1595 }
1596
1597 if (info->valid & ACPI_VALID_HID)
1598 acpi_add_id(pnp, info->hardware_id.string);
1599 if (info->valid & ACPI_VALID_CID) {
1600 cid_list = &info->compatible_id_list;
1601 for (i = 0; i < cid_list->count; i++)
1602 acpi_add_id(pnp, cid_list->ids[i].string);
1603 }
1604 if (info->valid & ACPI_VALID_ADR) {
1605 pnp->bus_address = info->address;
1606 pnp->type.bus_address = 1;
1607 }
1608 if (info->valid & ACPI_VALID_UID)
1609 pnp->unique_id = kstrdup(info->unique_id.string,
1610 GFP_KERNEL);
1611
1612 kfree(info);
1613
1614 /*
1615 * Some devices don't reliably have _HIDs & _CIDs, so add
1616 * synthetic HIDs to make sure drivers can find them.
1617 */
1618 if (acpi_is_video_device(handle))
1619 acpi_add_id(pnp, ACPI_VIDEO_HID);
1620 else if (acpi_bay_match(handle))
1621 acpi_add_id(pnp, ACPI_BAY_HID);
1622 else if (acpi_dock_match(handle))
1623 acpi_add_id(pnp, ACPI_DOCK_HID);
1624 else if (acpi_ibm_smbus_match(handle))
1625 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1626 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1627 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1628 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1629 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1630 }
1631
1632 break;
1633 case ACPI_BUS_TYPE_POWER:
1634 acpi_add_id(pnp, ACPI_POWER_HID);
1635 break;
1636 case ACPI_BUS_TYPE_PROCESSOR:
1637 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1638 break;
1639 case ACPI_BUS_TYPE_THERMAL:
1640 acpi_add_id(pnp, ACPI_THERMAL_HID);
1641 break;
1642 case ACPI_BUS_TYPE_POWER_BUTTON:
1643 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1644 break;
1645 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1646 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1647 break;
1648 }
1649 }
1650
1651 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1652 {
1653 struct acpi_hardware_id *id, *tmp;
1654
1655 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1656 kfree(id->id);
1657 kfree(id);
1658 }
1659 kfree(pnp->unique_id);
1660 }
1661
1662 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1663 int type, unsigned long long sta)
1664 {
1665 INIT_LIST_HEAD(&device->pnp.ids);
1666 device->device_type = type;
1667 device->handle = handle;
1668 device->parent = acpi_bus_get_parent(handle);
1669 STRUCT_TO_INT(device->status) = sta;
1670 acpi_device_get_busid(device);
1671 acpi_set_pnp_ids(handle, &device->pnp, type);
1672 acpi_bus_get_flags(device);
1673 device->flags.match_driver = false;
1674 device_initialize(&device->dev);
1675 dev_set_uevent_suppress(&device->dev, true);
1676 }
1677
1678 void acpi_device_add_finalize(struct acpi_device *device)
1679 {
1680 device->flags.match_driver = true;
1681 dev_set_uevent_suppress(&device->dev, false);
1682 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1683 }
1684
1685 static int acpi_add_single_object(struct acpi_device **child,
1686 acpi_handle handle, int type,
1687 unsigned long long sta)
1688 {
1689 int result;
1690 struct acpi_device *device;
1691 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1692
1693 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1694 if (!device) {
1695 printk(KERN_ERR PREFIX "Memory allocation error\n");
1696 return -ENOMEM;
1697 }
1698
1699 acpi_init_device_object(device, handle, type, sta);
1700 acpi_bus_get_power_flags(device);
1701 acpi_bus_get_wakeup_device_flags(device);
1702
1703 result = acpi_device_add(device, acpi_device_release);
1704 if (result) {
1705 acpi_device_release(&device->dev);
1706 return result;
1707 }
1708
1709 acpi_power_add_remove_device(device, true);
1710 acpi_device_add_finalize(device);
1711 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1712 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1713 dev_name(&device->dev), (char *) buffer.pointer,
1714 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1715 kfree(buffer.pointer);
1716 *child = device;
1717 return 0;
1718 }
1719
1720 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1721 unsigned long long *sta)
1722 {
1723 acpi_status status;
1724 acpi_object_type acpi_type;
1725
1726 status = acpi_get_type(handle, &acpi_type);
1727 if (ACPI_FAILURE(status))
1728 return -ENODEV;
1729
1730 switch (acpi_type) {
1731 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1732 case ACPI_TYPE_DEVICE:
1733 *type = ACPI_BUS_TYPE_DEVICE;
1734 status = acpi_bus_get_status_handle(handle, sta);
1735 if (ACPI_FAILURE(status))
1736 return -ENODEV;
1737 break;
1738 case ACPI_TYPE_PROCESSOR:
1739 *type = ACPI_BUS_TYPE_PROCESSOR;
1740 status = acpi_bus_get_status_handle(handle, sta);
1741 if (ACPI_FAILURE(status))
1742 return -ENODEV;
1743 break;
1744 case ACPI_TYPE_THERMAL:
1745 *type = ACPI_BUS_TYPE_THERMAL;
1746 *sta = ACPI_STA_DEFAULT;
1747 break;
1748 case ACPI_TYPE_POWER:
1749 *type = ACPI_BUS_TYPE_POWER;
1750 *sta = ACPI_STA_DEFAULT;
1751 break;
1752 default:
1753 return -ENODEV;
1754 }
1755
1756 return 0;
1757 }
1758
1759 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1760 char *idstr,
1761 const struct acpi_device_id **matchid)
1762 {
1763 const struct acpi_device_id *devid;
1764
1765 for (devid = handler->ids; devid->id[0]; devid++)
1766 if (!strcmp((char *)devid->id, idstr)) {
1767 if (matchid)
1768 *matchid = devid;
1769
1770 return true;
1771 }
1772
1773 return false;
1774 }
1775
1776 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1777 const struct acpi_device_id **matchid)
1778 {
1779 struct acpi_scan_handler *handler;
1780
1781 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1782 if (acpi_scan_handler_matching(handler, idstr, matchid))
1783 return handler;
1784
1785 return NULL;
1786 }
1787
1788 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1789 {
1790 if (!!hotplug->enabled == !!val)
1791 return;
1792
1793 mutex_lock(&acpi_scan_lock);
1794
1795 hotplug->enabled = val;
1796
1797 mutex_unlock(&acpi_scan_lock);
1798 }
1799
1800 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1801 {
1802 struct acpi_device_pnp pnp = {};
1803 struct acpi_hardware_id *hwid;
1804 struct acpi_scan_handler *handler;
1805
1806 INIT_LIST_HEAD(&pnp.ids);
1807 acpi_set_pnp_ids(handle, &pnp, type);
1808
1809 if (!pnp.type.hardware_id)
1810 goto out;
1811
1812 /*
1813 * This relies on the fact that acpi_install_notify_handler() will not
1814 * install the same notify handler routine twice for the same handle.
1815 */
1816 list_for_each_entry(hwid, &pnp.ids, list) {
1817 handler = acpi_scan_match_handler(hwid->id, NULL);
1818 if (handler) {
1819 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1820 acpi_hotplug_notify_cb, handler);
1821 break;
1822 }
1823 }
1824
1825 out:
1826 acpi_free_pnp_ids(&pnp);
1827 }
1828
1829 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1830 void *not_used, void **return_value)
1831 {
1832 struct acpi_device *device = NULL;
1833 int type;
1834 unsigned long long sta;
1835 int result;
1836
1837 acpi_bus_get_device(handle, &device);
1838 if (device)
1839 goto out;
1840
1841 result = acpi_bus_type_and_status(handle, &type, &sta);
1842 if (result)
1843 return AE_OK;
1844
1845 if (type == ACPI_BUS_TYPE_POWER) {
1846 acpi_add_power_resource(handle);
1847 return AE_OK;
1848 }
1849
1850 acpi_scan_init_hotplug(handle, type);
1851
1852 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1853 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1854 struct acpi_device_wakeup wakeup;
1855
1856 if (acpi_has_method(handle, "_PRW")) {
1857 acpi_bus_extract_wakeup_device_power_package(handle,
1858 &wakeup);
1859 acpi_power_resources_list_free(&wakeup.resources);
1860 }
1861 return AE_CTRL_DEPTH;
1862 }
1863
1864 acpi_add_single_object(&device, handle, type, sta);
1865 if (!device)
1866 return AE_CTRL_DEPTH;
1867
1868 out:
1869 if (!*return_value)
1870 *return_value = device;
1871
1872 return AE_OK;
1873 }
1874
1875 static int acpi_scan_attach_handler(struct acpi_device *device)
1876 {
1877 struct acpi_hardware_id *hwid;
1878 int ret = 0;
1879
1880 list_for_each_entry(hwid, &device->pnp.ids, list) {
1881 const struct acpi_device_id *devid;
1882 struct acpi_scan_handler *handler;
1883
1884 handler = acpi_scan_match_handler(hwid->id, &devid);
1885 if (handler) {
1886 ret = handler->attach(device, devid);
1887 if (ret > 0) {
1888 device->handler = handler;
1889 break;
1890 } else if (ret < 0) {
1891 break;
1892 }
1893 }
1894 }
1895 return ret;
1896 }
1897
1898 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1899 void *not_used, void **ret_not_used)
1900 {
1901 struct acpi_device *device;
1902 unsigned long long sta_not_used;
1903 int ret;
1904
1905 /*
1906 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1907 * namespace walks prematurely.
1908 */
1909 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1910 return AE_OK;
1911
1912 if (acpi_bus_get_device(handle, &device))
1913 return AE_CTRL_DEPTH;
1914
1915 if (device->handler)
1916 return AE_OK;
1917
1918 ret = acpi_scan_attach_handler(device);
1919 if (ret)
1920 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1921
1922 ret = device_attach(&device->dev);
1923 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1924 }
1925
1926 /**
1927 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1928 * @handle: Root of the namespace scope to scan.
1929 *
1930 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1931 * found devices.
1932 *
1933 * If no devices were found, -ENODEV is returned, but it does not mean that
1934 * there has been a real error. There just have been no suitable ACPI objects
1935 * in the table trunk from which the kernel could create a device and add an
1936 * appropriate driver.
1937 *
1938 * Must be called under acpi_scan_lock.
1939 */
1940 int acpi_bus_scan(acpi_handle handle)
1941 {
1942 void *device = NULL;
1943 int error = 0;
1944
1945 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1946 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1947 acpi_bus_check_add, NULL, NULL, &device);
1948
1949 if (!device)
1950 error = -ENODEV;
1951 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1952 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1953 acpi_bus_device_attach, NULL, NULL, NULL);
1954
1955 return error;
1956 }
1957 EXPORT_SYMBOL(acpi_bus_scan);
1958
1959 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1960 void *not_used, void **ret_not_used)
1961 {
1962 struct acpi_device *device = NULL;
1963
1964 if (!acpi_bus_get_device(handle, &device)) {
1965 struct acpi_scan_handler *dev_handler = device->handler;
1966
1967 if (dev_handler) {
1968 if (dev_handler->detach)
1969 dev_handler->detach(device);
1970
1971 device->handler = NULL;
1972 } else {
1973 device_release_driver(&device->dev);
1974 }
1975 }
1976 return AE_OK;
1977 }
1978
1979 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1980 void *not_used, void **ret_not_used)
1981 {
1982 struct acpi_device *device = NULL;
1983
1984 if (!acpi_bus_get_device(handle, &device))
1985 acpi_device_unregister(device);
1986
1987 return AE_OK;
1988 }
1989
1990 /**
1991 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1992 * @start: Root of the ACPI device nodes subtree to remove.
1993 *
1994 * Must be called under acpi_scan_lock.
1995 */
1996 void acpi_bus_trim(struct acpi_device *start)
1997 {
1998 /*
1999 * Execute acpi_bus_device_detach() as a post-order callback to detach
2000 * all ACPI drivers from the device nodes being removed.
2001 */
2002 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2003 acpi_bus_device_detach, NULL, NULL);
2004 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
2005 /*
2006 * Execute acpi_bus_remove() as a post-order callback to remove device
2007 * nodes in the given namespace scope.
2008 */
2009 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2010 acpi_bus_remove, NULL, NULL);
2011 acpi_bus_remove(start->handle, 0, NULL, NULL);
2012 }
2013 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2014
2015 static int acpi_bus_scan_fixed(void)
2016 {
2017 int result = 0;
2018
2019 /*
2020 * Enumerate all fixed-feature devices.
2021 */
2022 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2023 struct acpi_device *device = NULL;
2024
2025 result = acpi_add_single_object(&device, NULL,
2026 ACPI_BUS_TYPE_POWER_BUTTON,
2027 ACPI_STA_DEFAULT);
2028 if (result)
2029 return result;
2030
2031 result = device_attach(&device->dev);
2032 if (result < 0)
2033 return result;
2034
2035 device_init_wakeup(&device->dev, true);
2036 }
2037
2038 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2039 struct acpi_device *device = NULL;
2040
2041 result = acpi_add_single_object(&device, NULL,
2042 ACPI_BUS_TYPE_SLEEP_BUTTON,
2043 ACPI_STA_DEFAULT);
2044 if (result)
2045 return result;
2046
2047 result = device_attach(&device->dev);
2048 }
2049
2050 return result < 0 ? result : 0;
2051 }
2052
2053 int __init acpi_scan_init(void)
2054 {
2055 int result;
2056
2057 result = bus_register(&acpi_bus_type);
2058 if (result) {
2059 /* We don't want to quit even if we failed to add suspend/resume */
2060 printk(KERN_ERR PREFIX "Could not register bus type\n");
2061 }
2062
2063 acpi_pci_root_init();
2064 acpi_pci_link_init();
2065 acpi_processor_init();
2066 acpi_platform_init();
2067 acpi_lpss_init();
2068 acpi_cmos_rtc_init();
2069 acpi_container_init();
2070 acpi_memory_hotplug_init();
2071 acpi_dock_init();
2072
2073 mutex_lock(&acpi_scan_lock);
2074 /*
2075 * Enumerate devices in the ACPI namespace.
2076 */
2077 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2078 if (result)
2079 goto out;
2080
2081 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2082 if (result)
2083 goto out;
2084
2085 result = acpi_bus_scan_fixed();
2086 if (result) {
2087 acpi_device_unregister(acpi_root);
2088 goto out;
2089 }
2090
2091 acpi_update_all_gpes();
2092
2093 acpi_pci_root_hp_init();
2094
2095 out:
2096 mutex_unlock(&acpi_scan_lock);
2097 return result;
2098 }
Linus' kernel tree