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ACPI / scan: Allow ACPI drivers to bind to PNP device objects
[deliverable/linux.git] / drivers / acpi / scan.c
1 /*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
14
15 #include <asm/pgtable.h>
16
17 #include "internal.h"
18
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 extern struct acpi_device *acpi_root;
22
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
26
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
28
29 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
30
31 /*
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
34 */
35 bool acpi_force_hot_remove;
36
37 static const char *dummy_hid = "device";
38
39 static LIST_HEAD(acpi_bus_id_list);
40 static DEFINE_MUTEX(acpi_scan_lock);
41 static LIST_HEAD(acpi_scan_handlers_list);
42 DEFINE_MUTEX(acpi_device_lock);
43 LIST_HEAD(acpi_wakeup_device_list);
44 static DEFINE_MUTEX(acpi_hp_context_lock);
45
46 struct acpi_device_bus_id{
47 char bus_id[15];
48 unsigned int instance_no;
49 struct list_head node;
50 };
51
52 void acpi_scan_lock_acquire(void)
53 {
54 mutex_lock(&acpi_scan_lock);
55 }
56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57
58 void acpi_scan_lock_release(void)
59 {
60 mutex_unlock(&acpi_scan_lock);
61 }
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63
64 void acpi_lock_hp_context(void)
65 {
66 mutex_lock(&acpi_hp_context_lock);
67 }
68
69 void acpi_unlock_hp_context(void)
70 {
71 mutex_unlock(&acpi_hp_context_lock);
72 }
73
74 void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
78 {
79 acpi_lock_hp_context();
80 hp->notify = notify;
81 hp->uevent = uevent;
82 acpi_set_hp_context(adev, hp);
83 acpi_unlock_hp_context();
84 }
85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
86
87 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
88 {
89 if (!handler)
90 return -EINVAL;
91
92 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
93 return 0;
94 }
95
96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
97 const char *hotplug_profile_name)
98 {
99 int error;
100
101 error = acpi_scan_add_handler(handler);
102 if (error)
103 return error;
104
105 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
106 return 0;
107 }
108
109 /*
110 * Creates hid/cid(s) string needed for modalias and uevent
111 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
112 * char *modalias: "acpi:IBM0001:ACPI0001"
113 * Return: 0: no _HID and no _CID
114 * -EINVAL: output error
115 * -ENOMEM: output is truncated
116 */
117 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
118 int size)
119 {
120 int len;
121 int count;
122 struct acpi_hardware_id *id;
123
124 if (list_empty(&acpi_dev->pnp.ids))
125 return 0;
126
127 len = snprintf(modalias, size, "acpi:");
128 size -= len;
129
130 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
131 count = snprintf(&modalias[len], size, "%s:", id->id);
132 if (count < 0)
133 return EINVAL;
134 if (count >= size)
135 return -ENOMEM;
136 len += count;
137 size -= count;
138 }
139
140 modalias[len] = '\0';
141 return len;
142 }
143
144 /*
145 * Creates uevent modalias field for ACPI enumerated devices.
146 * Because the other buses does not support ACPI HIDs & CIDs.
147 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
148 * "acpi:IBM0001:ACPI0001"
149 */
150 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
151 {
152 struct acpi_device *acpi_dev;
153 int len;
154
155 acpi_dev = ACPI_COMPANION(dev);
156 if (!acpi_dev)
157 return -ENODEV;
158
159 /* Fall back to bus specific way of modalias exporting */
160 if (list_empty(&acpi_dev->pnp.ids))
161 return -ENODEV;
162
163 if (add_uevent_var(env, "MODALIAS="))
164 return -ENOMEM;
165 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
166 sizeof(env->buf) - env->buflen);
167 if (len <= 0)
168 return len;
169 env->buflen += len;
170 return 0;
171 }
172 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
173
174 /*
175 * Creates modalias sysfs attribute for ACPI enumerated devices.
176 * Because the other buses does not support ACPI HIDs & CIDs.
177 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
178 * "acpi:IBM0001:ACPI0001"
179 */
180 int acpi_device_modalias(struct device *dev, char *buf, int size)
181 {
182 struct acpi_device *acpi_dev;
183 int len;
184
185 acpi_dev = ACPI_COMPANION(dev);
186 if (!acpi_dev)
187 return -ENODEV;
188
189 /* Fall back to bus specific way of modalias exporting */
190 if (list_empty(&acpi_dev->pnp.ids))
191 return -ENODEV;
192
193 len = create_modalias(acpi_dev, buf, size -1);
194 if (len <= 0)
195 return len;
196 buf[len++] = '\n';
197 return len;
198 }
199 EXPORT_SYMBOL_GPL(acpi_device_modalias);
200
201 static ssize_t
202 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
203 struct acpi_device *acpi_dev = to_acpi_device(dev);
204 int len;
205
206 len = create_modalias(acpi_dev, buf, 1024);
207 if (len <= 0)
208 return len;
209 buf[len++] = '\n';
210 return len;
211 }
212 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
213
214 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
215 {
216 struct acpi_device_physical_node *pn;
217 bool offline = true;
218
219 mutex_lock(&adev->physical_node_lock);
220
221 list_for_each_entry(pn, &adev->physical_node_list, node)
222 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
223 if (uevent)
224 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
225
226 offline = false;
227 break;
228 }
229
230 mutex_unlock(&adev->physical_node_lock);
231 return offline;
232 }
233
234 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
235 void **ret_p)
236 {
237 struct acpi_device *device = NULL;
238 struct acpi_device_physical_node *pn;
239 bool second_pass = (bool)data;
240 acpi_status status = AE_OK;
241
242 if (acpi_bus_get_device(handle, &device))
243 return AE_OK;
244
245 if (device->handler && !device->handler->hotplug.enabled) {
246 *ret_p = &device->dev;
247 return AE_SUPPORT;
248 }
249
250 mutex_lock(&device->physical_node_lock);
251
252 list_for_each_entry(pn, &device->physical_node_list, node) {
253 int ret;
254
255 if (second_pass) {
256 /* Skip devices offlined by the first pass. */
257 if (pn->put_online)
258 continue;
259 } else {
260 pn->put_online = false;
261 }
262 ret = device_offline(pn->dev);
263 if (acpi_force_hot_remove)
264 continue;
265
266 if (ret >= 0) {
267 pn->put_online = !ret;
268 } else {
269 *ret_p = pn->dev;
270 if (second_pass) {
271 status = AE_ERROR;
272 break;
273 }
274 }
275 }
276
277 mutex_unlock(&device->physical_node_lock);
278
279 return status;
280 }
281
282 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
283 void **ret_p)
284 {
285 struct acpi_device *device = NULL;
286 struct acpi_device_physical_node *pn;
287
288 if (acpi_bus_get_device(handle, &device))
289 return AE_OK;
290
291 mutex_lock(&device->physical_node_lock);
292
293 list_for_each_entry(pn, &device->physical_node_list, node)
294 if (pn->put_online) {
295 device_online(pn->dev);
296 pn->put_online = false;
297 }
298
299 mutex_unlock(&device->physical_node_lock);
300
301 return AE_OK;
302 }
303
304 static int acpi_scan_try_to_offline(struct acpi_device *device)
305 {
306 acpi_handle handle = device->handle;
307 struct device *errdev = NULL;
308 acpi_status status;
309
310 /*
311 * Carry out two passes here and ignore errors in the first pass,
312 * because if the devices in question are memory blocks and
313 * CONFIG_MEMCG is set, one of the blocks may hold data structures
314 * that the other blocks depend on, but it is not known in advance which
315 * block holds them.
316 *
317 * If the first pass is successful, the second one isn't needed, though.
318 */
319 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
320 NULL, acpi_bus_offline, (void *)false,
321 (void **)&errdev);
322 if (status == AE_SUPPORT) {
323 dev_warn(errdev, "Offline disabled.\n");
324 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
325 acpi_bus_online, NULL, NULL, NULL);
326 return -EPERM;
327 }
328 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
329 if (errdev) {
330 errdev = NULL;
331 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
332 NULL, acpi_bus_offline, (void *)true,
333 (void **)&errdev);
334 if (!errdev || acpi_force_hot_remove)
335 acpi_bus_offline(handle, 0, (void *)true,
336 (void **)&errdev);
337
338 if (errdev && !acpi_force_hot_remove) {
339 dev_warn(errdev, "Offline failed.\n");
340 acpi_bus_online(handle, 0, NULL, NULL);
341 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
342 ACPI_UINT32_MAX, acpi_bus_online,
343 NULL, NULL, NULL);
344 return -EBUSY;
345 }
346 }
347 return 0;
348 }
349
350 static int acpi_scan_hot_remove(struct acpi_device *device)
351 {
352 acpi_handle handle = device->handle;
353 unsigned long long sta;
354 acpi_status status;
355
356 if (device->handler && device->handler->hotplug.demand_offline
357 && !acpi_force_hot_remove) {
358 if (!acpi_scan_is_offline(device, true))
359 return -EBUSY;
360 } else {
361 int error = acpi_scan_try_to_offline(device);
362 if (error)
363 return error;
364 }
365
366 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
367 "Hot-removing device %s...\n", dev_name(&device->dev)));
368
369 acpi_bus_trim(device);
370
371 acpi_evaluate_lck(handle, 0);
372 /*
373 * TBD: _EJD support.
374 */
375 status = acpi_evaluate_ej0(handle);
376 if (status == AE_NOT_FOUND)
377 return -ENODEV;
378 else if (ACPI_FAILURE(status))
379 return -EIO;
380
381 /*
382 * Verify if eject was indeed successful. If not, log an error
383 * message. No need to call _OST since _EJ0 call was made OK.
384 */
385 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
386 if (ACPI_FAILURE(status)) {
387 acpi_handle_warn(handle,
388 "Status check after eject failed (0x%x)\n", status);
389 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
390 acpi_handle_warn(handle,
391 "Eject incomplete - status 0x%llx\n", sta);
392 }
393
394 return 0;
395 }
396
397 static int acpi_scan_device_not_present(struct acpi_device *adev)
398 {
399 if (!acpi_device_enumerated(adev)) {
400 dev_warn(&adev->dev, "Still not present\n");
401 return -EALREADY;
402 }
403 acpi_bus_trim(adev);
404 return 0;
405 }
406
407 static int acpi_scan_device_check(struct acpi_device *adev)
408 {
409 int error;
410
411 acpi_bus_get_status(adev);
412 if (adev->status.present || adev->status.functional) {
413 /*
414 * This function is only called for device objects for which
415 * matching scan handlers exist. The only situation in which
416 * the scan handler is not attached to this device object yet
417 * is when the device has just appeared (either it wasn't
418 * present at all before or it was removed and then added
419 * again).
420 */
421 if (adev->handler) {
422 dev_warn(&adev->dev, "Already enumerated\n");
423 return -EALREADY;
424 }
425 error = acpi_bus_scan(adev->handle);
426 if (error) {
427 dev_warn(&adev->dev, "Namespace scan failure\n");
428 return error;
429 }
430 if (!adev->handler) {
431 dev_warn(&adev->dev, "Enumeration failure\n");
432 error = -ENODEV;
433 }
434 } else {
435 error = acpi_scan_device_not_present(adev);
436 }
437 return error;
438 }
439
440 static int acpi_scan_bus_check(struct acpi_device *adev)
441 {
442 struct acpi_scan_handler *handler = adev->handler;
443 struct acpi_device *child;
444 int error;
445
446 acpi_bus_get_status(adev);
447 if (!(adev->status.present || adev->status.functional)) {
448 acpi_scan_device_not_present(adev);
449 return 0;
450 }
451 if (handler && handler->hotplug.scan_dependent)
452 return handler->hotplug.scan_dependent(adev);
453
454 error = acpi_bus_scan(adev->handle);
455 if (error) {
456 dev_warn(&adev->dev, "Namespace scan failure\n");
457 return error;
458 }
459 list_for_each_entry(child, &adev->children, node) {
460 error = acpi_scan_bus_check(child);
461 if (error)
462 return error;
463 }
464 return 0;
465 }
466
467 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
468 {
469 switch (type) {
470 case ACPI_NOTIFY_BUS_CHECK:
471 return acpi_scan_bus_check(adev);
472 case ACPI_NOTIFY_DEVICE_CHECK:
473 return acpi_scan_device_check(adev);
474 case ACPI_NOTIFY_EJECT_REQUEST:
475 case ACPI_OST_EC_OSPM_EJECT:
476 if (adev->handler && !adev->handler->hotplug.enabled) {
477 dev_info(&adev->dev, "Eject disabled\n");
478 return -EPERM;
479 }
480 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
481 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
482 return acpi_scan_hot_remove(adev);
483 }
484 return -EINVAL;
485 }
486
487 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
488 {
489 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
490 int error = -ENODEV;
491
492 lock_device_hotplug();
493 mutex_lock(&acpi_scan_lock);
494
495 /*
496 * The device object's ACPI handle cannot become invalid as long as we
497 * are holding acpi_scan_lock, but it might have become invalid before
498 * that lock was acquired.
499 */
500 if (adev->handle == INVALID_ACPI_HANDLE)
501 goto err_out;
502
503 if (adev->flags.is_dock_station) {
504 error = dock_notify(adev, src);
505 } else if (adev->flags.hotplug_notify) {
506 error = acpi_generic_hotplug_event(adev, src);
507 if (error == -EPERM) {
508 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
509 goto err_out;
510 }
511 } else {
512 int (*notify)(struct acpi_device *, u32);
513
514 acpi_lock_hp_context();
515 notify = adev->hp ? adev->hp->notify : NULL;
516 acpi_unlock_hp_context();
517 /*
518 * There may be additional notify handlers for device objects
519 * without the .event() callback, so ignore them here.
520 */
521 if (notify)
522 error = notify(adev, src);
523 else
524 goto out;
525 }
526 if (!error)
527 ost_code = ACPI_OST_SC_SUCCESS;
528
529 err_out:
530 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
531
532 out:
533 acpi_bus_put_acpi_device(adev);
534 mutex_unlock(&acpi_scan_lock);
535 unlock_device_hotplug();
536 }
537
538 static ssize_t real_power_state_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
540 {
541 struct acpi_device *adev = to_acpi_device(dev);
542 int state;
543 int ret;
544
545 ret = acpi_device_get_power(adev, &state);
546 if (ret)
547 return ret;
548
549 return sprintf(buf, "%s\n", acpi_power_state_string(state));
550 }
551
552 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
553
554 static ssize_t power_state_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
556 {
557 struct acpi_device *adev = to_acpi_device(dev);
558
559 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
560 }
561
562 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
563
564 static ssize_t
565 acpi_eject_store(struct device *d, struct device_attribute *attr,
566 const char *buf, size_t count)
567 {
568 struct acpi_device *acpi_device = to_acpi_device(d);
569 acpi_object_type not_used;
570 acpi_status status;
571
572 if (!count || buf[0] != '1')
573 return -EINVAL;
574
575 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
576 && !acpi_device->driver)
577 return -ENODEV;
578
579 status = acpi_get_type(acpi_device->handle, &not_used);
580 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
581 return -ENODEV;
582
583 get_device(&acpi_device->dev);
584 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
585 if (ACPI_SUCCESS(status))
586 return count;
587
588 put_device(&acpi_device->dev);
589 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
590 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
591 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
592 }
593
594 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
595
596 static ssize_t
597 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
598 struct acpi_device *acpi_dev = to_acpi_device(dev);
599
600 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
601 }
602 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
603
604 static ssize_t acpi_device_uid_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
606 {
607 struct acpi_device *acpi_dev = to_acpi_device(dev);
608
609 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
610 }
611 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
612
613 static ssize_t acpi_device_adr_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
615 {
616 struct acpi_device *acpi_dev = to_acpi_device(dev);
617
618 return sprintf(buf, "0x%08x\n",
619 (unsigned int)(acpi_dev->pnp.bus_address));
620 }
621 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
622
623 static ssize_t
624 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
625 struct acpi_device *acpi_dev = to_acpi_device(dev);
626 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
627 int result;
628
629 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
630 if (result)
631 goto end;
632
633 result = sprintf(buf, "%s\n", (char*)path.pointer);
634 kfree(path.pointer);
635 end:
636 return result;
637 }
638 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
639
640 /* sysfs file that shows description text from the ACPI _STR method */
641 static ssize_t description_show(struct device *dev,
642 struct device_attribute *attr,
643 char *buf) {
644 struct acpi_device *acpi_dev = to_acpi_device(dev);
645 int result;
646
647 if (acpi_dev->pnp.str_obj == NULL)
648 return 0;
649
650 /*
651 * The _STR object contains a Unicode identifier for a device.
652 * We need to convert to utf-8 so it can be displayed.
653 */
654 result = utf16s_to_utf8s(
655 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
656 acpi_dev->pnp.str_obj->buffer.length,
657 UTF16_LITTLE_ENDIAN, buf,
658 PAGE_SIZE);
659
660 buf[result++] = '\n';
661
662 return result;
663 }
664 static DEVICE_ATTR(description, 0444, description_show, NULL);
665
666 static ssize_t
667 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
668 char *buf) {
669 struct acpi_device *acpi_dev = to_acpi_device(dev);
670
671 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
672 }
673 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
674
675 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
676 char *buf) {
677 struct acpi_device *acpi_dev = to_acpi_device(dev);
678 acpi_status status;
679 unsigned long long sta;
680
681 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
682 if (ACPI_FAILURE(status))
683 return -ENODEV;
684
685 return sprintf(buf, "%llu\n", sta);
686 }
687 static DEVICE_ATTR_RO(status);
688
689 static int acpi_device_setup_files(struct acpi_device *dev)
690 {
691 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
692 acpi_status status;
693 unsigned long long sun;
694 int result = 0;
695
696 /*
697 * Devices gotten from FADT don't have a "path" attribute
698 */
699 if (dev->handle) {
700 result = device_create_file(&dev->dev, &dev_attr_path);
701 if (result)
702 goto end;
703 }
704
705 if (!list_empty(&dev->pnp.ids)) {
706 result = device_create_file(&dev->dev, &dev_attr_hid);
707 if (result)
708 goto end;
709
710 result = device_create_file(&dev->dev, &dev_attr_modalias);
711 if (result)
712 goto end;
713 }
714
715 /*
716 * If device has _STR, 'description' file is created
717 */
718 if (acpi_has_method(dev->handle, "_STR")) {
719 status = acpi_evaluate_object(dev->handle, "_STR",
720 NULL, &buffer);
721 if (ACPI_FAILURE(status))
722 buffer.pointer = NULL;
723 dev->pnp.str_obj = buffer.pointer;
724 result = device_create_file(&dev->dev, &dev_attr_description);
725 if (result)
726 goto end;
727 }
728
729 if (dev->pnp.type.bus_address)
730 result = device_create_file(&dev->dev, &dev_attr_adr);
731 if (dev->pnp.unique_id)
732 result = device_create_file(&dev->dev, &dev_attr_uid);
733
734 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
735 if (ACPI_SUCCESS(status)) {
736 dev->pnp.sun = (unsigned long)sun;
737 result = device_create_file(&dev->dev, &dev_attr_sun);
738 if (result)
739 goto end;
740 } else {
741 dev->pnp.sun = (unsigned long)-1;
742 }
743
744 if (acpi_has_method(dev->handle, "_STA")) {
745 result = device_create_file(&dev->dev, &dev_attr_status);
746 if (result)
747 goto end;
748 }
749
750 /*
751 * If device has _EJ0, 'eject' file is created that is used to trigger
752 * hot-removal function from userland.
753 */
754 if (acpi_has_method(dev->handle, "_EJ0")) {
755 result = device_create_file(&dev->dev, &dev_attr_eject);
756 if (result)
757 return result;
758 }
759
760 if (dev->flags.power_manageable) {
761 result = device_create_file(&dev->dev, &dev_attr_power_state);
762 if (result)
763 return result;
764
765 if (dev->power.flags.power_resources)
766 result = device_create_file(&dev->dev,
767 &dev_attr_real_power_state);
768 }
769
770 end:
771 return result;
772 }
773
774 static void acpi_device_remove_files(struct acpi_device *dev)
775 {
776 if (dev->flags.power_manageable) {
777 device_remove_file(&dev->dev, &dev_attr_power_state);
778 if (dev->power.flags.power_resources)
779 device_remove_file(&dev->dev,
780 &dev_attr_real_power_state);
781 }
782
783 /*
784 * If device has _STR, remove 'description' file
785 */
786 if (acpi_has_method(dev->handle, "_STR")) {
787 kfree(dev->pnp.str_obj);
788 device_remove_file(&dev->dev, &dev_attr_description);
789 }
790 /*
791 * If device has _EJ0, remove 'eject' file.
792 */
793 if (acpi_has_method(dev->handle, "_EJ0"))
794 device_remove_file(&dev->dev, &dev_attr_eject);
795
796 if (acpi_has_method(dev->handle, "_SUN"))
797 device_remove_file(&dev->dev, &dev_attr_sun);
798
799 if (dev->pnp.unique_id)
800 device_remove_file(&dev->dev, &dev_attr_uid);
801 if (dev->pnp.type.bus_address)
802 device_remove_file(&dev->dev, &dev_attr_adr);
803 device_remove_file(&dev->dev, &dev_attr_modalias);
804 device_remove_file(&dev->dev, &dev_attr_hid);
805 if (acpi_has_method(dev->handle, "_STA"))
806 device_remove_file(&dev->dev, &dev_attr_status);
807 if (dev->handle)
808 device_remove_file(&dev->dev, &dev_attr_path);
809 }
810 /* --------------------------------------------------------------------------
811 ACPI Bus operations
812 -------------------------------------------------------------------------- */
813
814 static const struct acpi_device_id *__acpi_match_device(
815 struct acpi_device *device, const struct acpi_device_id *ids)
816 {
817 const struct acpi_device_id *id;
818 struct acpi_hardware_id *hwid;
819
820 /*
821 * If the device is not present, it is unnecessary to load device
822 * driver for it.
823 */
824 if (!device->status.present)
825 return NULL;
826
827 for (id = ids; id->id[0]; id++)
828 list_for_each_entry(hwid, &device->pnp.ids, list)
829 if (!strcmp((char *) id->id, hwid->id))
830 return id;
831
832 return NULL;
833 }
834
835 /**
836 * acpi_match_device - Match a struct device against a given list of ACPI IDs
837 * @ids: Array of struct acpi_device_id object to match against.
838 * @dev: The device structure to match.
839 *
840 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
841 * object for that handle and use that object to match against a given list of
842 * device IDs.
843 *
844 * Return a pointer to the first matching ID on success or %NULL on failure.
845 */
846 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
847 const struct device *dev)
848 {
849 struct acpi_device *adev;
850 acpi_handle handle = ACPI_HANDLE(dev);
851
852 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
853 return NULL;
854
855 return __acpi_match_device(adev, ids);
856 }
857 EXPORT_SYMBOL_GPL(acpi_match_device);
858
859 int acpi_match_device_ids(struct acpi_device *device,
860 const struct acpi_device_id *ids)
861 {
862 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
863 }
864 EXPORT_SYMBOL(acpi_match_device_ids);
865
866 static void acpi_free_power_resources_lists(struct acpi_device *device)
867 {
868 int i;
869
870 if (device->wakeup.flags.valid)
871 acpi_power_resources_list_free(&device->wakeup.resources);
872
873 if (!device->flags.power_manageable)
874 return;
875
876 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
877 struct acpi_device_power_state *ps = &device->power.states[i];
878 acpi_power_resources_list_free(&ps->resources);
879 }
880 }
881
882 static void acpi_device_release(struct device *dev)
883 {
884 struct acpi_device *acpi_dev = to_acpi_device(dev);
885
886 acpi_free_pnp_ids(&acpi_dev->pnp);
887 acpi_free_power_resources_lists(acpi_dev);
888 kfree(acpi_dev);
889 }
890
891 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
892 {
893 struct acpi_device *acpi_dev = to_acpi_device(dev);
894 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
895
896 return acpi_dev->flags.match_driver
897 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
898 }
899
900 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
901 {
902 struct acpi_device *acpi_dev = to_acpi_device(dev);
903 int len;
904
905 if (list_empty(&acpi_dev->pnp.ids))
906 return 0;
907
908 if (add_uevent_var(env, "MODALIAS="))
909 return -ENOMEM;
910 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
911 sizeof(env->buf) - env->buflen);
912 if (len <= 0)
913 return len;
914 env->buflen += len;
915 return 0;
916 }
917
918 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
919 {
920 struct acpi_device *device = data;
921
922 device->driver->ops.notify(device, event);
923 }
924
925 static acpi_status acpi_device_notify_fixed(void *data)
926 {
927 struct acpi_device *device = data;
928
929 /* Fixed hardware devices have no handles */
930 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
931 return AE_OK;
932 }
933
934 static int acpi_device_install_notify_handler(struct acpi_device *device)
935 {
936 acpi_status status;
937
938 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
939 status =
940 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
941 acpi_device_notify_fixed,
942 device);
943 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
944 status =
945 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
946 acpi_device_notify_fixed,
947 device);
948 else
949 status = acpi_install_notify_handler(device->handle,
950 ACPI_DEVICE_NOTIFY,
951 acpi_device_notify,
952 device);
953
954 if (ACPI_FAILURE(status))
955 return -EINVAL;
956 return 0;
957 }
958
959 static void acpi_device_remove_notify_handler(struct acpi_device *device)
960 {
961 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
962 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
963 acpi_device_notify_fixed);
964 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
965 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
966 acpi_device_notify_fixed);
967 else
968 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
969 acpi_device_notify);
970 }
971
972 static int acpi_device_probe(struct device *dev)
973 {
974 struct acpi_device *acpi_dev = to_acpi_device(dev);
975 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
976 int ret;
977
978 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
979 return -EINVAL;
980
981 if (!acpi_drv->ops.add)
982 return -ENOSYS;
983
984 ret = acpi_drv->ops.add(acpi_dev);
985 if (ret)
986 return ret;
987
988 acpi_dev->driver = acpi_drv;
989 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
990 "Driver [%s] successfully bound to device [%s]\n",
991 acpi_drv->name, acpi_dev->pnp.bus_id));
992
993 if (acpi_drv->ops.notify) {
994 ret = acpi_device_install_notify_handler(acpi_dev);
995 if (ret) {
996 if (acpi_drv->ops.remove)
997 acpi_drv->ops.remove(acpi_dev);
998
999 acpi_dev->driver = NULL;
1000 acpi_dev->driver_data = NULL;
1001 return ret;
1002 }
1003 }
1004
1005 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1006 acpi_drv->name, acpi_dev->pnp.bus_id));
1007 get_device(dev);
1008 return 0;
1009 }
1010
1011 static int acpi_device_remove(struct device * dev)
1012 {
1013 struct acpi_device *acpi_dev = to_acpi_device(dev);
1014 struct acpi_driver *acpi_drv = acpi_dev->driver;
1015
1016 if (acpi_drv) {
1017 if (acpi_drv->ops.notify)
1018 acpi_device_remove_notify_handler(acpi_dev);
1019 if (acpi_drv->ops.remove)
1020 acpi_drv->ops.remove(acpi_dev);
1021 }
1022 acpi_dev->driver = NULL;
1023 acpi_dev->driver_data = NULL;
1024
1025 put_device(dev);
1026 return 0;
1027 }
1028
1029 struct bus_type acpi_bus_type = {
1030 .name = "acpi",
1031 .match = acpi_bus_match,
1032 .probe = acpi_device_probe,
1033 .remove = acpi_device_remove,
1034 .uevent = acpi_device_uevent,
1035 };
1036
1037 static void acpi_device_del(struct acpi_device *device)
1038 {
1039 mutex_lock(&acpi_device_lock);
1040 if (device->parent)
1041 list_del(&device->node);
1042
1043 list_del(&device->wakeup_list);
1044 mutex_unlock(&acpi_device_lock);
1045
1046 acpi_power_add_remove_device(device, false);
1047 acpi_device_remove_files(device);
1048 if (device->remove)
1049 device->remove(device);
1050
1051 device_del(&device->dev);
1052 }
1053
1054 static LIST_HEAD(acpi_device_del_list);
1055 static DEFINE_MUTEX(acpi_device_del_lock);
1056
1057 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1058 {
1059 for (;;) {
1060 struct acpi_device *adev;
1061
1062 mutex_lock(&acpi_device_del_lock);
1063
1064 if (list_empty(&acpi_device_del_list)) {
1065 mutex_unlock(&acpi_device_del_lock);
1066 break;
1067 }
1068 adev = list_first_entry(&acpi_device_del_list,
1069 struct acpi_device, del_list);
1070 list_del(&adev->del_list);
1071
1072 mutex_unlock(&acpi_device_del_lock);
1073
1074 acpi_device_del(adev);
1075 /*
1076 * Drop references to all power resources that might have been
1077 * used by the device.
1078 */
1079 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1080 put_device(&adev->dev);
1081 }
1082 }
1083
1084 /**
1085 * acpi_scan_drop_device - Drop an ACPI device object.
1086 * @handle: Handle of an ACPI namespace node, not used.
1087 * @context: Address of the ACPI device object to drop.
1088 *
1089 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1090 * namespace node the device object pointed to by @context is attached to.
1091 *
1092 * The unregistration is carried out asynchronously to avoid running
1093 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1094 * ensure the correct ordering (the device objects must be unregistered in the
1095 * same order in which the corresponding namespace nodes are deleted).
1096 */
1097 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1098 {
1099 static DECLARE_WORK(work, acpi_device_del_work_fn);
1100 struct acpi_device *adev = context;
1101
1102 mutex_lock(&acpi_device_del_lock);
1103
1104 /*
1105 * Use the ACPI hotplug workqueue which is ordered, so this work item
1106 * won't run after any hotplug work items submitted subsequently. That
1107 * prevents attempts to register device objects identical to those being
1108 * deleted from happening concurrently (such attempts result from
1109 * hotplug events handled via the ACPI hotplug workqueue). It also will
1110 * run after all of the work items submitted previosuly, which helps
1111 * those work items to ensure that they are not accessing stale device
1112 * objects.
1113 */
1114 if (list_empty(&acpi_device_del_list))
1115 acpi_queue_hotplug_work(&work);
1116
1117 list_add_tail(&adev->del_list, &acpi_device_del_list);
1118 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1119 adev->handle = INVALID_ACPI_HANDLE;
1120
1121 mutex_unlock(&acpi_device_del_lock);
1122 }
1123
1124 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1125 void (*callback)(void *))
1126 {
1127 acpi_status status;
1128
1129 if (!device)
1130 return -EINVAL;
1131
1132 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1133 (void **)device, callback);
1134 if (ACPI_FAILURE(status) || !*device) {
1135 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1136 handle));
1137 return -ENODEV;
1138 }
1139 return 0;
1140 }
1141
1142 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1143 {
1144 return acpi_get_device_data(handle, device, NULL);
1145 }
1146 EXPORT_SYMBOL(acpi_bus_get_device);
1147
1148 static void get_acpi_device(void *dev)
1149 {
1150 if (dev)
1151 get_device(&((struct acpi_device *)dev)->dev);
1152 }
1153
1154 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1155 {
1156 struct acpi_device *adev = NULL;
1157
1158 acpi_get_device_data(handle, &adev, get_acpi_device);
1159 return adev;
1160 }
1161
1162 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1163 {
1164 put_device(&adev->dev);
1165 }
1166
1167 int acpi_device_add(struct acpi_device *device,
1168 void (*release)(struct device *))
1169 {
1170 int result;
1171 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1172 int found = 0;
1173
1174 if (device->handle) {
1175 acpi_status status;
1176
1177 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1178 device);
1179 if (ACPI_FAILURE(status)) {
1180 acpi_handle_err(device->handle,
1181 "Unable to attach device data\n");
1182 return -ENODEV;
1183 }
1184 }
1185
1186 /*
1187 * Linkage
1188 * -------
1189 * Link this device to its parent and siblings.
1190 */
1191 INIT_LIST_HEAD(&device->children);
1192 INIT_LIST_HEAD(&device->node);
1193 INIT_LIST_HEAD(&device->wakeup_list);
1194 INIT_LIST_HEAD(&device->physical_node_list);
1195 INIT_LIST_HEAD(&device->del_list);
1196 mutex_init(&device->physical_node_lock);
1197
1198 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1199 if (!new_bus_id) {
1200 pr_err(PREFIX "Memory allocation error\n");
1201 result = -ENOMEM;
1202 goto err_detach;
1203 }
1204
1205 mutex_lock(&acpi_device_lock);
1206 /*
1207 * Find suitable bus_id and instance number in acpi_bus_id_list
1208 * If failed, create one and link it into acpi_bus_id_list
1209 */
1210 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1211 if (!strcmp(acpi_device_bus_id->bus_id,
1212 acpi_device_hid(device))) {
1213 acpi_device_bus_id->instance_no++;
1214 found = 1;
1215 kfree(new_bus_id);
1216 break;
1217 }
1218 }
1219 if (!found) {
1220 acpi_device_bus_id = new_bus_id;
1221 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1222 acpi_device_bus_id->instance_no = 0;
1223 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1224 }
1225 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1226
1227 if (device->parent)
1228 list_add_tail(&device->node, &device->parent->children);
1229
1230 if (device->wakeup.flags.valid)
1231 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1232 mutex_unlock(&acpi_device_lock);
1233
1234 if (device->parent)
1235 device->dev.parent = &device->parent->dev;
1236 device->dev.bus = &acpi_bus_type;
1237 device->dev.release = release;
1238 result = device_add(&device->dev);
1239 if (result) {
1240 dev_err(&device->dev, "Error registering device\n");
1241 goto err;
1242 }
1243
1244 result = acpi_device_setup_files(device);
1245 if (result)
1246 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1247 dev_name(&device->dev));
1248
1249 return 0;
1250
1251 err:
1252 mutex_lock(&acpi_device_lock);
1253 if (device->parent)
1254 list_del(&device->node);
1255 list_del(&device->wakeup_list);
1256 mutex_unlock(&acpi_device_lock);
1257
1258 err_detach:
1259 acpi_detach_data(device->handle, acpi_scan_drop_device);
1260 return result;
1261 }
1262
1263 /* --------------------------------------------------------------------------
1264 Driver Management
1265 -------------------------------------------------------------------------- */
1266 /**
1267 * acpi_bus_register_driver - register a driver with the ACPI bus
1268 * @driver: driver being registered
1269 *
1270 * Registers a driver with the ACPI bus. Searches the namespace for all
1271 * devices that match the driver's criteria and binds. Returns zero for
1272 * success or a negative error status for failure.
1273 */
1274 int acpi_bus_register_driver(struct acpi_driver *driver)
1275 {
1276 int ret;
1277
1278 if (acpi_disabled)
1279 return -ENODEV;
1280 driver->drv.name = driver->name;
1281 driver->drv.bus = &acpi_bus_type;
1282 driver->drv.owner = driver->owner;
1283
1284 ret = driver_register(&driver->drv);
1285 return ret;
1286 }
1287
1288 EXPORT_SYMBOL(acpi_bus_register_driver);
1289
1290 /**
1291 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1292 * @driver: driver to unregister
1293 *
1294 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1295 * devices that match the driver's criteria and unbinds.
1296 */
1297 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1298 {
1299 driver_unregister(&driver->drv);
1300 }
1301
1302 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1303
1304 /* --------------------------------------------------------------------------
1305 Device Enumeration
1306 -------------------------------------------------------------------------- */
1307 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1308 {
1309 struct acpi_device *device = NULL;
1310 acpi_status status;
1311
1312 /*
1313 * Fixed hardware devices do not appear in the namespace and do not
1314 * have handles, but we fabricate acpi_devices for them, so we have
1315 * to deal with them specially.
1316 */
1317 if (!handle)
1318 return acpi_root;
1319
1320 do {
1321 status = acpi_get_parent(handle, &handle);
1322 if (ACPI_FAILURE(status))
1323 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1324 } while (acpi_bus_get_device(handle, &device));
1325 return device;
1326 }
1327
1328 acpi_status
1329 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1330 {
1331 acpi_status status;
1332 acpi_handle tmp;
1333 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1334 union acpi_object *obj;
1335
1336 status = acpi_get_handle(handle, "_EJD", &tmp);
1337 if (ACPI_FAILURE(status))
1338 return status;
1339
1340 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1341 if (ACPI_SUCCESS(status)) {
1342 obj = buffer.pointer;
1343 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1344 ejd);
1345 kfree(buffer.pointer);
1346 }
1347 return status;
1348 }
1349 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1350
1351 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1352 struct acpi_device_wakeup *wakeup)
1353 {
1354 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1355 union acpi_object *package = NULL;
1356 union acpi_object *element = NULL;
1357 acpi_status status;
1358 int err = -ENODATA;
1359
1360 if (!wakeup)
1361 return -EINVAL;
1362
1363 INIT_LIST_HEAD(&wakeup->resources);
1364
1365 /* _PRW */
1366 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1367 if (ACPI_FAILURE(status)) {
1368 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1369 return err;
1370 }
1371
1372 package = (union acpi_object *)buffer.pointer;
1373
1374 if (!package || package->package.count < 2)
1375 goto out;
1376
1377 element = &(package->package.elements[0]);
1378 if (!element)
1379 goto out;
1380
1381 if (element->type == ACPI_TYPE_PACKAGE) {
1382 if ((element->package.count < 2) ||
1383 (element->package.elements[0].type !=
1384 ACPI_TYPE_LOCAL_REFERENCE)
1385 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1386 goto out;
1387
1388 wakeup->gpe_device =
1389 element->package.elements[0].reference.handle;
1390 wakeup->gpe_number =
1391 (u32) element->package.elements[1].integer.value;
1392 } else if (element->type == ACPI_TYPE_INTEGER) {
1393 wakeup->gpe_device = NULL;
1394 wakeup->gpe_number = element->integer.value;
1395 } else {
1396 goto out;
1397 }
1398
1399 element = &(package->package.elements[1]);
1400 if (element->type != ACPI_TYPE_INTEGER)
1401 goto out;
1402
1403 wakeup->sleep_state = element->integer.value;
1404
1405 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1406 if (err)
1407 goto out;
1408
1409 if (!list_empty(&wakeup->resources)) {
1410 int sleep_state;
1411
1412 err = acpi_power_wakeup_list_init(&wakeup->resources,
1413 &sleep_state);
1414 if (err) {
1415 acpi_handle_warn(handle, "Retrieving current states "
1416 "of wakeup power resources failed\n");
1417 acpi_power_resources_list_free(&wakeup->resources);
1418 goto out;
1419 }
1420 if (sleep_state < wakeup->sleep_state) {
1421 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1422 "(S%d) by S%d from power resources\n",
1423 (int)wakeup->sleep_state, sleep_state);
1424 wakeup->sleep_state = sleep_state;
1425 }
1426 }
1427
1428 out:
1429 kfree(buffer.pointer);
1430 return err;
1431 }
1432
1433 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1434 {
1435 struct acpi_device_id button_device_ids[] = {
1436 {"PNP0C0C", 0},
1437 {"PNP0C0D", 0},
1438 {"PNP0C0E", 0},
1439 {"", 0},
1440 };
1441 struct acpi_device_wakeup *wakeup = &device->wakeup;
1442 acpi_status status;
1443 acpi_event_status event_status;
1444
1445 wakeup->flags.notifier_present = 0;
1446
1447 /* Power button, Lid switch always enable wakeup */
1448 if (!acpi_match_device_ids(device, button_device_ids)) {
1449 wakeup->flags.run_wake = 1;
1450 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1451 /* Do not use Lid/sleep button for S5 wakeup */
1452 if (wakeup->sleep_state == ACPI_STATE_S5)
1453 wakeup->sleep_state = ACPI_STATE_S4;
1454 }
1455 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1456 device_set_wakeup_capable(&device->dev, true);
1457 return;
1458 }
1459
1460 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1461 wakeup->gpe_number);
1462 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1463 &event_status);
1464 if (ACPI_FAILURE(status))
1465 return;
1466
1467 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1468 }
1469
1470 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1471 {
1472 int err;
1473
1474 /* Presence of _PRW indicates wake capable */
1475 if (!acpi_has_method(device->handle, "_PRW"))
1476 return;
1477
1478 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1479 &device->wakeup);
1480 if (err) {
1481 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1482 return;
1483 }
1484
1485 device->wakeup.flags.valid = 1;
1486 device->wakeup.prepare_count = 0;
1487 acpi_wakeup_gpe_init(device);
1488 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1489 * system for the ACPI device with the _PRW object.
1490 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1491 * So it is necessary to call _DSW object first. Only when it is not
1492 * present will the _PSW object used.
1493 */
1494 err = acpi_device_sleep_wake(device, 0, 0, 0);
1495 if (err)
1496 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1497 "error in _DSW or _PSW evaluation\n"));
1498 }
1499
1500 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1501 {
1502 struct acpi_device_power_state *ps = &device->power.states[state];
1503 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1504 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1505 acpi_status status;
1506
1507 INIT_LIST_HEAD(&ps->resources);
1508
1509 /* Evaluate "_PRx" to get referenced power resources */
1510 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1511 if (ACPI_SUCCESS(status)) {
1512 union acpi_object *package = buffer.pointer;
1513
1514 if (buffer.length && package
1515 && package->type == ACPI_TYPE_PACKAGE
1516 && package->package.count) {
1517 int err = acpi_extract_power_resources(package, 0,
1518 &ps->resources);
1519 if (!err)
1520 device->power.flags.power_resources = 1;
1521 }
1522 ACPI_FREE(buffer.pointer);
1523 }
1524
1525 /* Evaluate "_PSx" to see if we can do explicit sets */
1526 pathname[2] = 'S';
1527 if (acpi_has_method(device->handle, pathname))
1528 ps->flags.explicit_set = 1;
1529
1530 /*
1531 * State is valid if there are means to put the device into it.
1532 * D3hot is only valid if _PR3 present.
1533 */
1534 if (!list_empty(&ps->resources)
1535 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1536 ps->flags.valid = 1;
1537 ps->flags.os_accessible = 1;
1538 }
1539
1540 ps->power = -1; /* Unknown - driver assigned */
1541 ps->latency = -1; /* Unknown - driver assigned */
1542 }
1543
1544 static void acpi_bus_get_power_flags(struct acpi_device *device)
1545 {
1546 u32 i;
1547
1548 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1549 if (!acpi_has_method(device->handle, "_PS0") &&
1550 !acpi_has_method(device->handle, "_PR0"))
1551 return;
1552
1553 device->flags.power_manageable = 1;
1554
1555 /*
1556 * Power Management Flags
1557 */
1558 if (acpi_has_method(device->handle, "_PSC"))
1559 device->power.flags.explicit_get = 1;
1560
1561 if (acpi_has_method(device->handle, "_IRC"))
1562 device->power.flags.inrush_current = 1;
1563
1564 if (acpi_has_method(device->handle, "_DSW"))
1565 device->power.flags.dsw_present = 1;
1566
1567 /*
1568 * Enumerate supported power management states
1569 */
1570 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1571 acpi_bus_init_power_state(device, i);
1572
1573 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1574
1575 /* Set defaults for D0 and D3 states (always valid) */
1576 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1577 device->power.states[ACPI_STATE_D0].power = 100;
1578 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1579 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1580
1581 /* Set D3cold's explicit_set flag if _PS3 exists. */
1582 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1583 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1584
1585 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1586 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1587 device->power.flags.power_resources)
1588 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1589
1590 if (acpi_bus_init_power(device)) {
1591 acpi_free_power_resources_lists(device);
1592 device->flags.power_manageable = 0;
1593 }
1594 }
1595
1596 static void acpi_bus_get_flags(struct acpi_device *device)
1597 {
1598 /* Presence of _STA indicates 'dynamic_status' */
1599 if (acpi_has_method(device->handle, "_STA"))
1600 device->flags.dynamic_status = 1;
1601
1602 /* Presence of _RMV indicates 'removable' */
1603 if (acpi_has_method(device->handle, "_RMV"))
1604 device->flags.removable = 1;
1605
1606 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1607 if (acpi_has_method(device->handle, "_EJD") ||
1608 acpi_has_method(device->handle, "_EJ0"))
1609 device->flags.ejectable = 1;
1610 }
1611
1612 static void acpi_device_get_busid(struct acpi_device *device)
1613 {
1614 char bus_id[5] = { '?', 0 };
1615 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1616 int i = 0;
1617
1618 /*
1619 * Bus ID
1620 * ------
1621 * The device's Bus ID is simply the object name.
1622 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1623 */
1624 if (ACPI_IS_ROOT_DEVICE(device)) {
1625 strcpy(device->pnp.bus_id, "ACPI");
1626 return;
1627 }
1628
1629 switch (device->device_type) {
1630 case ACPI_BUS_TYPE_POWER_BUTTON:
1631 strcpy(device->pnp.bus_id, "PWRF");
1632 break;
1633 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1634 strcpy(device->pnp.bus_id, "SLPF");
1635 break;
1636 default:
1637 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1638 /* Clean up trailing underscores (if any) */
1639 for (i = 3; i > 1; i--) {
1640 if (bus_id[i] == '_')
1641 bus_id[i] = '\0';
1642 else
1643 break;
1644 }
1645 strcpy(device->pnp.bus_id, bus_id);
1646 break;
1647 }
1648 }
1649
1650 /*
1651 * acpi_ata_match - see if an acpi object is an ATA device
1652 *
1653 * If an acpi object has one of the ACPI ATA methods defined,
1654 * then we can safely call it an ATA device.
1655 */
1656 bool acpi_ata_match(acpi_handle handle)
1657 {
1658 return acpi_has_method(handle, "_GTF") ||
1659 acpi_has_method(handle, "_GTM") ||
1660 acpi_has_method(handle, "_STM") ||
1661 acpi_has_method(handle, "_SDD");
1662 }
1663
1664 /*
1665 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1666 *
1667 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1668 * then we can safely call it an ejectable drive bay
1669 */
1670 bool acpi_bay_match(acpi_handle handle)
1671 {
1672 acpi_handle phandle;
1673
1674 if (!acpi_has_method(handle, "_EJ0"))
1675 return false;
1676 if (acpi_ata_match(handle))
1677 return true;
1678 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1679 return false;
1680
1681 return acpi_ata_match(phandle);
1682 }
1683
1684 bool acpi_device_is_battery(struct acpi_device *adev)
1685 {
1686 struct acpi_hardware_id *hwid;
1687
1688 list_for_each_entry(hwid, &adev->pnp.ids, list)
1689 if (!strcmp("PNP0C0A", hwid->id))
1690 return true;
1691
1692 return false;
1693 }
1694
1695 static bool is_ejectable_bay(struct acpi_device *adev)
1696 {
1697 acpi_handle handle = adev->handle;
1698
1699 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1700 return true;
1701
1702 return acpi_bay_match(handle);
1703 }
1704
1705 /*
1706 * acpi_dock_match - see if an acpi object has a _DCK method
1707 */
1708 bool acpi_dock_match(acpi_handle handle)
1709 {
1710 return acpi_has_method(handle, "_DCK");
1711 }
1712
1713 const char *acpi_device_hid(struct acpi_device *device)
1714 {
1715 struct acpi_hardware_id *hid;
1716
1717 if (list_empty(&device->pnp.ids))
1718 return dummy_hid;
1719
1720 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1721 return hid->id;
1722 }
1723 EXPORT_SYMBOL(acpi_device_hid);
1724
1725 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1726 {
1727 struct acpi_hardware_id *id;
1728
1729 id = kmalloc(sizeof(*id), GFP_KERNEL);
1730 if (!id)
1731 return;
1732
1733 id->id = kstrdup(dev_id, GFP_KERNEL);
1734 if (!id->id) {
1735 kfree(id);
1736 return;
1737 }
1738
1739 list_add_tail(&id->list, &pnp->ids);
1740 pnp->type.hardware_id = 1;
1741 }
1742
1743 /*
1744 * Old IBM workstations have a DSDT bug wherein the SMBus object
1745 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1746 * prefix. Work around this.
1747 */
1748 static bool acpi_ibm_smbus_match(acpi_handle handle)
1749 {
1750 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1751 struct acpi_buffer path = { sizeof(node_name), node_name };
1752
1753 if (!dmi_name_in_vendors("IBM"))
1754 return false;
1755
1756 /* Look for SMBS object */
1757 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1758 strcmp("SMBS", path.pointer))
1759 return false;
1760
1761 /* Does it have the necessary (but misnamed) methods? */
1762 if (acpi_has_method(handle, "SBI") &&
1763 acpi_has_method(handle, "SBR") &&
1764 acpi_has_method(handle, "SBW"))
1765 return true;
1766
1767 return false;
1768 }
1769
1770 static bool acpi_object_is_system_bus(acpi_handle handle)
1771 {
1772 acpi_handle tmp;
1773
1774 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1775 tmp == handle)
1776 return true;
1777 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1778 tmp == handle)
1779 return true;
1780
1781 return false;
1782 }
1783
1784 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1785 int device_type)
1786 {
1787 acpi_status status;
1788 struct acpi_device_info *info;
1789 struct acpi_pnp_device_id_list *cid_list;
1790 int i;
1791
1792 switch (device_type) {
1793 case ACPI_BUS_TYPE_DEVICE:
1794 if (handle == ACPI_ROOT_OBJECT) {
1795 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1796 break;
1797 }
1798
1799 status = acpi_get_object_info(handle, &info);
1800 if (ACPI_FAILURE(status)) {
1801 pr_err(PREFIX "%s: Error reading device info\n",
1802 __func__);
1803 return;
1804 }
1805
1806 if (info->valid & ACPI_VALID_HID) {
1807 acpi_add_id(pnp, info->hardware_id.string);
1808 pnp->type.platform_id = 1;
1809 }
1810 if (info->valid & ACPI_VALID_CID) {
1811 cid_list = &info->compatible_id_list;
1812 for (i = 0; i < cid_list->count; i++)
1813 acpi_add_id(pnp, cid_list->ids[i].string);
1814 }
1815 if (info->valid & ACPI_VALID_ADR) {
1816 pnp->bus_address = info->address;
1817 pnp->type.bus_address = 1;
1818 }
1819 if (info->valid & ACPI_VALID_UID)
1820 pnp->unique_id = kstrdup(info->unique_id.string,
1821 GFP_KERNEL);
1822
1823 kfree(info);
1824
1825 /*
1826 * Some devices don't reliably have _HIDs & _CIDs, so add
1827 * synthetic HIDs to make sure drivers can find them.
1828 */
1829 if (acpi_is_video_device(handle))
1830 acpi_add_id(pnp, ACPI_VIDEO_HID);
1831 else if (acpi_bay_match(handle))
1832 acpi_add_id(pnp, ACPI_BAY_HID);
1833 else if (acpi_dock_match(handle))
1834 acpi_add_id(pnp, ACPI_DOCK_HID);
1835 else if (acpi_ibm_smbus_match(handle))
1836 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1837 else if (list_empty(&pnp->ids) &&
1838 acpi_object_is_system_bus(handle)) {
1839 /* \_SB, \_TZ, LNXSYBUS */
1840 acpi_add_id(pnp, ACPI_BUS_HID);
1841 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1842 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1843 }
1844
1845 break;
1846 case ACPI_BUS_TYPE_POWER:
1847 acpi_add_id(pnp, ACPI_POWER_HID);
1848 break;
1849 case ACPI_BUS_TYPE_PROCESSOR:
1850 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1851 break;
1852 case ACPI_BUS_TYPE_THERMAL:
1853 acpi_add_id(pnp, ACPI_THERMAL_HID);
1854 break;
1855 case ACPI_BUS_TYPE_POWER_BUTTON:
1856 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1857 break;
1858 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1859 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1860 break;
1861 }
1862 }
1863
1864 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1865 {
1866 struct acpi_hardware_id *id, *tmp;
1867
1868 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1869 kfree(id->id);
1870 kfree(id);
1871 }
1872 kfree(pnp->unique_id);
1873 }
1874
1875 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1876 int type, unsigned long long sta)
1877 {
1878 INIT_LIST_HEAD(&device->pnp.ids);
1879 device->device_type = type;
1880 device->handle = handle;
1881 device->parent = acpi_bus_get_parent(handle);
1882 acpi_set_device_status(device, sta);
1883 acpi_device_get_busid(device);
1884 acpi_set_pnp_ids(handle, &device->pnp, type);
1885 acpi_bus_get_flags(device);
1886 device->flags.match_driver = false;
1887 device->flags.initialized = true;
1888 device->flags.visited = false;
1889 device_initialize(&device->dev);
1890 dev_set_uevent_suppress(&device->dev, true);
1891 }
1892
1893 void acpi_device_add_finalize(struct acpi_device *device)
1894 {
1895 dev_set_uevent_suppress(&device->dev, false);
1896 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1897 }
1898
1899 static int acpi_add_single_object(struct acpi_device **child,
1900 acpi_handle handle, int type,
1901 unsigned long long sta)
1902 {
1903 int result;
1904 struct acpi_device *device;
1905 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1906
1907 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1908 if (!device) {
1909 printk(KERN_ERR PREFIX "Memory allocation error\n");
1910 return -ENOMEM;
1911 }
1912
1913 acpi_init_device_object(device, handle, type, sta);
1914 acpi_bus_get_power_flags(device);
1915 acpi_bus_get_wakeup_device_flags(device);
1916
1917 result = acpi_device_add(device, acpi_device_release);
1918 if (result) {
1919 acpi_device_release(&device->dev);
1920 return result;
1921 }
1922
1923 acpi_power_add_remove_device(device, true);
1924 acpi_device_add_finalize(device);
1925 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1926 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1927 dev_name(&device->dev), (char *) buffer.pointer,
1928 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1929 kfree(buffer.pointer);
1930 *child = device;
1931 return 0;
1932 }
1933
1934 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1935 unsigned long long *sta)
1936 {
1937 acpi_status status;
1938 acpi_object_type acpi_type;
1939
1940 status = acpi_get_type(handle, &acpi_type);
1941 if (ACPI_FAILURE(status))
1942 return -ENODEV;
1943
1944 switch (acpi_type) {
1945 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1946 case ACPI_TYPE_DEVICE:
1947 *type = ACPI_BUS_TYPE_DEVICE;
1948 status = acpi_bus_get_status_handle(handle, sta);
1949 if (ACPI_FAILURE(status))
1950 return -ENODEV;
1951 break;
1952 case ACPI_TYPE_PROCESSOR:
1953 *type = ACPI_BUS_TYPE_PROCESSOR;
1954 status = acpi_bus_get_status_handle(handle, sta);
1955 if (ACPI_FAILURE(status))
1956 return -ENODEV;
1957 break;
1958 case ACPI_TYPE_THERMAL:
1959 *type = ACPI_BUS_TYPE_THERMAL;
1960 *sta = ACPI_STA_DEFAULT;
1961 break;
1962 case ACPI_TYPE_POWER:
1963 *type = ACPI_BUS_TYPE_POWER;
1964 *sta = ACPI_STA_DEFAULT;
1965 break;
1966 default:
1967 return -ENODEV;
1968 }
1969
1970 return 0;
1971 }
1972
1973 bool acpi_device_is_present(struct acpi_device *adev)
1974 {
1975 if (adev->status.present || adev->status.functional)
1976 return true;
1977
1978 adev->flags.initialized = false;
1979 return false;
1980 }
1981
1982 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1983 char *idstr,
1984 const struct acpi_device_id **matchid)
1985 {
1986 const struct acpi_device_id *devid;
1987
1988 if (handler->match)
1989 return handler->match(idstr, matchid);
1990
1991 for (devid = handler->ids; devid->id[0]; devid++)
1992 if (!strcmp((char *)devid->id, idstr)) {
1993 if (matchid)
1994 *matchid = devid;
1995
1996 return true;
1997 }
1998
1999 return false;
2000 }
2001
2002 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2003 const struct acpi_device_id **matchid)
2004 {
2005 struct acpi_scan_handler *handler;
2006
2007 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2008 if (acpi_scan_handler_matching(handler, idstr, matchid))
2009 return handler;
2010
2011 return NULL;
2012 }
2013
2014 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2015 {
2016 if (!!hotplug->enabled == !!val)
2017 return;
2018
2019 mutex_lock(&acpi_scan_lock);
2020
2021 hotplug->enabled = val;
2022
2023 mutex_unlock(&acpi_scan_lock);
2024 }
2025
2026 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2027 {
2028 struct acpi_hardware_id *hwid;
2029
2030 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2031 acpi_dock_add(adev);
2032 return;
2033 }
2034 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2035 struct acpi_scan_handler *handler;
2036
2037 handler = acpi_scan_match_handler(hwid->id, NULL);
2038 if (handler) {
2039 adev->flags.hotplug_notify = true;
2040 break;
2041 }
2042 }
2043 }
2044
2045 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2046 void *not_used, void **return_value)
2047 {
2048 struct acpi_device *device = NULL;
2049 int type;
2050 unsigned long long sta;
2051 int result;
2052
2053 acpi_bus_get_device(handle, &device);
2054 if (device)
2055 goto out;
2056
2057 result = acpi_bus_type_and_status(handle, &type, &sta);
2058 if (result)
2059 return AE_OK;
2060
2061 if (type == ACPI_BUS_TYPE_POWER) {
2062 acpi_add_power_resource(handle);
2063 return AE_OK;
2064 }
2065
2066 acpi_add_single_object(&device, handle, type, sta);
2067 if (!device)
2068 return AE_CTRL_DEPTH;
2069
2070 acpi_scan_init_hotplug(device);
2071
2072 out:
2073 if (!*return_value)
2074 *return_value = device;
2075
2076 return AE_OK;
2077 }
2078
2079 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2080 {
2081 bool *is_spi_i2c_slave_p = data;
2082
2083 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2084 return 1;
2085
2086 /*
2087 * devices that are connected to UART still need to be enumerated to
2088 * platform bus
2089 */
2090 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2091 *is_spi_i2c_slave_p = true;
2092
2093 /* no need to do more checking */
2094 return -1;
2095 }
2096
2097 static void acpi_default_enumeration(struct acpi_device *device)
2098 {
2099 struct list_head resource_list;
2100 bool is_spi_i2c_slave = false;
2101
2102 if (!device->pnp.type.platform_id || device->handler)
2103 return;
2104
2105 /*
2106 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2107 * respective parents.
2108 */
2109 INIT_LIST_HEAD(&resource_list);
2110 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2111 &is_spi_i2c_slave);
2112 acpi_dev_free_resource_list(&resource_list);
2113 if (!is_spi_i2c_slave)
2114 acpi_create_platform_device(device);
2115 }
2116
2117 static int acpi_scan_attach_handler(struct acpi_device *device)
2118 {
2119 struct acpi_hardware_id *hwid;
2120 int ret = 0;
2121
2122 list_for_each_entry(hwid, &device->pnp.ids, list) {
2123 const struct acpi_device_id *devid;
2124 struct acpi_scan_handler *handler;
2125
2126 handler = acpi_scan_match_handler(hwid->id, &devid);
2127 if (handler) {
2128 if (!handler->attach) {
2129 device->pnp.type.platform_id = 0;
2130 continue;
2131 }
2132 device->handler = handler;
2133 ret = handler->attach(device, devid);
2134 if (ret > 0)
2135 break;
2136
2137 device->handler = NULL;
2138 if (ret < 0)
2139 break;
2140 }
2141 }
2142 if (!ret)
2143 acpi_default_enumeration(device);
2144
2145 return ret;
2146 }
2147
2148 static void acpi_bus_attach(struct acpi_device *device)
2149 {
2150 struct acpi_device *child;
2151 acpi_handle ejd;
2152 int ret;
2153
2154 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2155 register_dock_dependent_device(device, ejd);
2156
2157 acpi_bus_get_status(device);
2158 /* Skip devices that are not present. */
2159 if (!acpi_device_is_present(device)) {
2160 device->flags.visited = false;
2161 return;
2162 }
2163 if (device->handler)
2164 goto ok;
2165
2166 if (!device->flags.initialized) {
2167 acpi_bus_update_power(device, NULL);
2168 device->flags.initialized = true;
2169 }
2170 device->flags.visited = false;
2171 ret = acpi_scan_attach_handler(device);
2172 if (ret < 0)
2173 return;
2174
2175 device->flags.match_driver = true;
2176 if (!ret) {
2177 ret = device_attach(&device->dev);
2178 if (ret < 0)
2179 return;
2180 }
2181 device->flags.visited = true;
2182
2183 ok:
2184 list_for_each_entry(child, &device->children, node)
2185 acpi_bus_attach(child);
2186 }
2187
2188 /**
2189 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2190 * @handle: Root of the namespace scope to scan.
2191 *
2192 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2193 * found devices.
2194 *
2195 * If no devices were found, -ENODEV is returned, but it does not mean that
2196 * there has been a real error. There just have been no suitable ACPI objects
2197 * in the table trunk from which the kernel could create a device and add an
2198 * appropriate driver.
2199 *
2200 * Must be called under acpi_scan_lock.
2201 */
2202 int acpi_bus_scan(acpi_handle handle)
2203 {
2204 void *device = NULL;
2205
2206 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2207 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2208 acpi_bus_check_add, NULL, NULL, &device);
2209
2210 if (device) {
2211 acpi_bus_attach(device);
2212 return 0;
2213 }
2214 return -ENODEV;
2215 }
2216 EXPORT_SYMBOL(acpi_bus_scan);
2217
2218 /**
2219 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2220 * @adev: Root of the ACPI namespace scope to walk.
2221 *
2222 * Must be called under acpi_scan_lock.
2223 */
2224 void acpi_bus_trim(struct acpi_device *adev)
2225 {
2226 struct acpi_scan_handler *handler = adev->handler;
2227 struct acpi_device *child;
2228
2229 list_for_each_entry_reverse(child, &adev->children, node)
2230 acpi_bus_trim(child);
2231
2232 adev->flags.match_driver = false;
2233 if (handler) {
2234 if (handler->detach)
2235 handler->detach(adev);
2236
2237 adev->handler = NULL;
2238 } else {
2239 device_release_driver(&adev->dev);
2240 }
2241 /*
2242 * Most likely, the device is going away, so put it into D3cold before
2243 * that.
2244 */
2245 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2246 adev->flags.initialized = false;
2247 adev->flags.visited = false;
2248 }
2249 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2250
2251 static int acpi_bus_scan_fixed(void)
2252 {
2253 int result = 0;
2254
2255 /*
2256 * Enumerate all fixed-feature devices.
2257 */
2258 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2259 struct acpi_device *device = NULL;
2260
2261 result = acpi_add_single_object(&device, NULL,
2262 ACPI_BUS_TYPE_POWER_BUTTON,
2263 ACPI_STA_DEFAULT);
2264 if (result)
2265 return result;
2266
2267 device->flags.match_driver = true;
2268 result = device_attach(&device->dev);
2269 if (result < 0)
2270 return result;
2271
2272 device_init_wakeup(&device->dev, true);
2273 }
2274
2275 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2276 struct acpi_device *device = NULL;
2277
2278 result = acpi_add_single_object(&device, NULL,
2279 ACPI_BUS_TYPE_SLEEP_BUTTON,
2280 ACPI_STA_DEFAULT);
2281 if (result)
2282 return result;
2283
2284 device->flags.match_driver = true;
2285 result = device_attach(&device->dev);
2286 }
2287
2288 return result < 0 ? result : 0;
2289 }
2290
2291 int __init acpi_scan_init(void)
2292 {
2293 int result;
2294
2295 result = bus_register(&acpi_bus_type);
2296 if (result) {
2297 /* We don't want to quit even if we failed to add suspend/resume */
2298 printk(KERN_ERR PREFIX "Could not register bus type\n");
2299 }
2300
2301 acpi_pci_root_init();
2302 acpi_pci_link_init();
2303 acpi_processor_init();
2304 acpi_lpss_init();
2305 acpi_cmos_rtc_init();
2306 acpi_container_init();
2307 acpi_memory_hotplug_init();
2308 acpi_pnp_init();
2309
2310 mutex_lock(&acpi_scan_lock);
2311 /*
2312 * Enumerate devices in the ACPI namespace.
2313 */
2314 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2315 if (result)
2316 goto out;
2317
2318 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2319 if (result)
2320 goto out;
2321
2322 /* Fixed feature devices do not exist on HW-reduced platform */
2323 if (!acpi_gbl_reduced_hardware) {
2324 result = acpi_bus_scan_fixed();
2325 if (result) {
2326 acpi_detach_data(acpi_root->handle,
2327 acpi_scan_drop_device);
2328 acpi_device_del(acpi_root);
2329 put_device(&acpi_root->dev);
2330 goto out;
2331 }
2332 }
2333
2334 acpi_update_all_gpes();
2335
2336 out:
2337 mutex_unlock(&acpi_scan_lock);
2338 return result;
2339 }
Linux kernel - Deliverables
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