forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
scan.c
1820 lines (1532 loc) · 46.9 KB
/
scan.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* scan.c - support for transforming the ACPI namespace into individual objects
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/signal.h>
#include <linux/kthread.h>
#include <linux/dmi.h>
#include <linux/nls.h>
#include <acpi/acpi_drivers.h>
#include "internal.h"
#define _COMPONENT ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("scan");
#define STRUCT_TO_INT(s) (*((int*)&s))
extern struct acpi_device *acpi_root;
#define ACPI_BUS_CLASS "system_bus"
#define ACPI_BUS_HID "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME "System Bus"
#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
static const char *dummy_hid = "device";
static LIST_HEAD(acpi_device_list);
static LIST_HEAD(acpi_bus_id_list);
static DEFINE_MUTEX(acpi_scan_lock);
static LIST_HEAD(acpi_scan_handlers_list);
DEFINE_MUTEX(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);
struct acpi_device_bus_id{
char bus_id[15];
unsigned int instance_no;
struct list_head node;
};
void acpi_scan_lock_acquire(void)
{
mutex_lock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
void acpi_scan_lock_release(void)
{
mutex_unlock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
int acpi_scan_add_handler(struct acpi_scan_handler *handler)
{
if (!handler || !handler->attach)
return -EINVAL;
list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
return 0;
}
/*
* Creates hid/cid(s) string needed for modalias and uevent
* e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
* char *modalias: "acpi:IBM0001:ACPI0001"
*/
static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
int size)
{
int len;
int count;
struct acpi_hardware_id *id;
if (list_empty(&acpi_dev->pnp.ids))
return 0;
len = snprintf(modalias, size, "acpi:");
size -= len;
list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
count = snprintf(&modalias[len], size, "%s:", id->id);
if (count < 0 || count >= size)
return -EINVAL;
len += count;
size -= count;
}
modalias[len] = '\0';
return len;
}
static ssize_t
acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
int len;
/* Device has no HID and no CID or string is >1024 */
len = create_modalias(acpi_dev, buf, 1024);
if (len <= 0)
return 0;
buf[len++] = '\n';
return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
/**
* acpi_bus_hot_remove_device: hot-remove a device and its children
* @context: struct acpi_eject_event pointer (freed in this func)
*
* Hot-remove a device and its children. This function frees up the
* memory space passed by arg context, so that the caller may call
* this function asynchronously through acpi_os_hotplug_execute().
*/
void acpi_bus_hot_remove_device(void *context)
{
struct acpi_eject_event *ej_event = context;
struct acpi_device *device = ej_event->device;
acpi_handle handle = device->handle;
acpi_handle temp;
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status = AE_OK;
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
mutex_lock(&acpi_scan_lock);
/* If there is no handle, the device node has been unregistered. */
if (!device->handle) {
dev_dbg(&device->dev, "ACPI handle missing\n");
put_device(&device->dev);
goto out;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Hot-removing device %s...\n", dev_name(&device->dev)));
acpi_bus_trim(device);
/* Device node has been unregistered. */
put_device(&device->dev);
device = NULL;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 0;
acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
}
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 1;
/*
* TBD: _EJD support.
*/
status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND)
acpi_handle_warn(handle, "Eject failed\n");
/* Tell the firmware the hot-remove operation has failed. */
acpi_evaluate_hotplug_ost(handle, ej_event->event,
ost_code, NULL);
}
out:
mutex_unlock(&acpi_scan_lock);
kfree(context);
return;
}
EXPORT_SYMBOL(acpi_bus_hot_remove_device);
static ssize_t real_power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_device *adev = to_acpi_device(dev);
int state;
int ret;
ret = acpi_device_get_power(adev, &state);
if (ret)
return ret;
return sprintf(buf, "%s\n", acpi_power_state_string(state));
}
static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
static ssize_t power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_device *adev = to_acpi_device(dev);
return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
}
static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
static ssize_t
acpi_eject_store(struct device *d, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret = count;
acpi_status status;
acpi_object_type type = 0;
struct acpi_device *acpi_device = to_acpi_device(d);
struct acpi_eject_event *ej_event;
if ((!count) || (buf[0] != '1')) {
return -EINVAL;
}
if (!acpi_device->driver && !acpi_device->handler) {
ret = -ENODEV;
goto err;
}
status = acpi_get_type(acpi_device->handle, &type);
if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
ret = -ENODEV;
goto err;
}
ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
if (!ej_event) {
ret = -ENOMEM;
goto err;
}
get_device(&acpi_device->dev);
ej_event->device = acpi_device;
if (acpi_device->flags.eject_pending) {
/* event originated from ACPI eject notification */
ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
acpi_device->flags.eject_pending = 0;
} else {
/* event originated from user */
ej_event->event = ACPI_OST_EC_OSPM_EJECT;
(void) acpi_evaluate_hotplug_ost(acpi_device->handle,
ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
}
status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
if (ACPI_FAILURE(status)) {
put_device(&acpi_device->dev);
kfree(ej_event);
}
err:
return ret;
}
static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
static ssize_t
acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
}
static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
static ssize_t acpi_device_uid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
}
static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
static ssize_t acpi_device_adr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
return sprintf(buf, "0x%08x\n",
(unsigned int)(acpi_dev->pnp.bus_address));
}
static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
static ssize_t
acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
int result;
result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
if (result)
goto end;
result = sprintf(buf, "%s\n", (char*)path.pointer);
kfree(path.pointer);
end:
return result;
}
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
/* sysfs file that shows description text from the ACPI _STR method */
static ssize_t description_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
int result;
if (acpi_dev->pnp.str_obj == NULL)
return 0;
/*
* The _STR object contains a Unicode identifier for a device.
* We need to convert to utf-8 so it can be displayed.
*/
result = utf16s_to_utf8s(
(wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
acpi_dev->pnp.str_obj->buffer.length,
UTF16_LITTLE_ENDIAN, buf,
PAGE_SIZE);
buf[result++] = '\n';
return result;
}
static DEVICE_ATTR(description, 0444, description_show, NULL);
static ssize_t
acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
}
static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
static int acpi_device_setup_files(struct acpi_device *dev)
{
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
acpi_status status;
acpi_handle temp;
unsigned long long sun;
int result = 0;
/*
* Devices gotten from FADT don't have a "path" attribute
*/
if (dev->handle) {
result = device_create_file(&dev->dev, &dev_attr_path);
if (result)
goto end;
}
if (!list_empty(&dev->pnp.ids)) {
result = device_create_file(&dev->dev, &dev_attr_hid);
if (result)
goto end;
result = device_create_file(&dev->dev, &dev_attr_modalias);
if (result)
goto end;
}
/*
* If device has _STR, 'description' file is created
*/
status = acpi_get_handle(dev->handle, "_STR", &temp);
if (ACPI_SUCCESS(status)) {
status = acpi_evaluate_object(dev->handle, "_STR",
NULL, &buffer);
if (ACPI_FAILURE(status))
buffer.pointer = NULL;
dev->pnp.str_obj = buffer.pointer;
result = device_create_file(&dev->dev, &dev_attr_description);
if (result)
goto end;
}
if (dev->flags.bus_address)
result = device_create_file(&dev->dev, &dev_attr_adr);
if (dev->pnp.unique_id)
result = device_create_file(&dev->dev, &dev_attr_uid);
status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
if (ACPI_SUCCESS(status)) {
dev->pnp.sun = (unsigned long)sun;
result = device_create_file(&dev->dev, &dev_attr_sun);
if (result)
goto end;
} else {
dev->pnp.sun = (unsigned long)-1;
}
/*
* If device has _EJ0, 'eject' file is created that is used to trigger
* hot-removal function from userland.
*/
status = acpi_get_handle(dev->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status)) {
result = device_create_file(&dev->dev, &dev_attr_eject);
if (result)
return result;
}
if (dev->flags.power_manageable) {
result = device_create_file(&dev->dev, &dev_attr_power_state);
if (result)
return result;
if (dev->power.flags.power_resources)
result = device_create_file(&dev->dev,
&dev_attr_real_power_state);
}
end:
return result;
}
static void acpi_device_remove_files(struct acpi_device *dev)
{
acpi_status status;
acpi_handle temp;
if (dev->flags.power_manageable) {
device_remove_file(&dev->dev, &dev_attr_power_state);
if (dev->power.flags.power_resources)
device_remove_file(&dev->dev,
&dev_attr_real_power_state);
}
/*
* If device has _STR, remove 'description' file
*/
status = acpi_get_handle(dev->handle, "_STR", &temp);
if (ACPI_SUCCESS(status)) {
kfree(dev->pnp.str_obj);
device_remove_file(&dev->dev, &dev_attr_description);
}
/*
* If device has _EJ0, remove 'eject' file.
*/
status = acpi_get_handle(dev->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status))
device_remove_file(&dev->dev, &dev_attr_eject);
status = acpi_get_handle(dev->handle, "_SUN", &temp);
if (ACPI_SUCCESS(status))
device_remove_file(&dev->dev, &dev_attr_sun);
if (dev->pnp.unique_id)
device_remove_file(&dev->dev, &dev_attr_uid);
if (dev->flags.bus_address)
device_remove_file(&dev->dev, &dev_attr_adr);
device_remove_file(&dev->dev, &dev_attr_modalias);
device_remove_file(&dev->dev, &dev_attr_hid);
if (dev->handle)
device_remove_file(&dev->dev, &dev_attr_path);
}
/* --------------------------------------------------------------------------
ACPI Bus operations
-------------------------------------------------------------------------- */
static const struct acpi_device_id *__acpi_match_device(
struct acpi_device *device, const struct acpi_device_id *ids)
{
const struct acpi_device_id *id;
struct acpi_hardware_id *hwid;
/*
* If the device is not present, it is unnecessary to load device
* driver for it.
*/
if (!device->status.present)
return NULL;
for (id = ids; id->id[0]; id++)
list_for_each_entry(hwid, &device->pnp.ids, list)
if (!strcmp((char *) id->id, hwid->id))
return id;
return NULL;
}
/**
* acpi_match_device - Match a struct device against a given list of ACPI IDs
* @ids: Array of struct acpi_device_id object to match against.
* @dev: The device structure to match.
*
* Check if @dev has a valid ACPI handle and if there is a struct acpi_device
* object for that handle and use that object to match against a given list of
* device IDs.
*
* Return a pointer to the first matching ID on success or %NULL on failure.
*/
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
const struct device *dev)
{
struct acpi_device *adev;
acpi_handle handle = ACPI_HANDLE(dev);
if (!ids || !handle || acpi_bus_get_device(handle, &adev))
return NULL;
return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids)
{
return __acpi_match_device(device, ids) ? 0 : -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);
void acpi_free_ids(struct acpi_device *device)
{
struct acpi_hardware_id *id, *tmp;
list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
kfree(id->id);
kfree(id);
}
kfree(device->pnp.unique_id);
}
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
int i;
if (device->wakeup.flags.valid)
acpi_power_resources_list_free(&device->wakeup.resources);
if (!device->flags.power_manageable)
return;
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
struct acpi_device_power_state *ps = &device->power.states[i];
acpi_power_resources_list_free(&ps->resources);
}
}
static void acpi_device_release(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
acpi_free_ids(acpi_dev);
acpi_free_power_resources_lists(acpi_dev);
kfree(acpi_dev);
}
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = to_acpi_driver(drv);
return acpi_dev->flags.match_driver
&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
}
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
int len;
if (list_empty(&acpi_dev->pnp.ids))
return 0;
if (add_uevent_var(env, "MODALIAS="))
return -ENOMEM;
len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
sizeof(env->buf) - env->buflen);
if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
env->buflen += len;
return 0;
}
static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_device *device = data;
device->driver->ops.notify(device, event);
}
static acpi_status acpi_device_notify_fixed(void *data)
{
struct acpi_device *device = data;
/* Fixed hardware devices have no handles */
acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
return AE_OK;
}
static int acpi_device_install_notify_handler(struct acpi_device *device)
{
acpi_status status;
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
status =
acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_device_notify_fixed,
device);
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
status =
acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
acpi_device_notify_fixed,
device);
else
status = acpi_install_notify_handler(device->handle,
ACPI_DEVICE_NOTIFY,
acpi_device_notify,
device);
if (ACPI_FAILURE(status))
return -EINVAL;
return 0;
}
static void acpi_device_remove_notify_handler(struct acpi_device *device)
{
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_device_notify_fixed);
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
acpi_device_notify_fixed);
else
acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
acpi_device_notify);
}
static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_device_probe(struct device * dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
int ret;
ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
if (!ret) {
if (acpi_drv->ops.notify) {
ret = acpi_device_install_notify_handler(acpi_dev);
if (ret) {
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev);
acpi_dev->driver = NULL;
acpi_dev->driver_data = NULL;
return ret;
}
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found driver [%s] for device [%s]\n",
acpi_drv->name, acpi_dev->pnp.bus_id));
get_device(dev);
}
return ret;
}
static int acpi_device_remove(struct device * dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = acpi_dev->driver;
if (acpi_drv) {
if (acpi_drv->ops.notify)
acpi_device_remove_notify_handler(acpi_dev);
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev);
}
acpi_dev->driver = NULL;
acpi_dev->driver_data = NULL;
put_device(dev);
return 0;
}
struct bus_type acpi_bus_type = {
.name = "acpi",
.match = acpi_bus_match,
.probe = acpi_device_probe,
.remove = acpi_device_remove,
.uevent = acpi_device_uevent,
};
int acpi_device_add(struct acpi_device *device,
void (*release)(struct device *))
{
int result;
struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
int found = 0;
if (device->handle) {
acpi_status status;
status = acpi_attach_data(device->handle, acpi_bus_data_handler,
device);
if (ACPI_FAILURE(status)) {
acpi_handle_err(device->handle,
"Unable to attach device data\n");
return -ENODEV;
}
}
/*
* Linkage
* -------
* Link this device to its parent and siblings.
*/
INIT_LIST_HEAD(&device->children);
INIT_LIST_HEAD(&device->node);
INIT_LIST_HEAD(&device->wakeup_list);
INIT_LIST_HEAD(&device->physical_node_list);
mutex_init(&device->physical_node_lock);
INIT_LIST_HEAD(&device->power_dependent);
new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
if (!new_bus_id) {
pr_err(PREFIX "Memory allocation error\n");
result = -ENOMEM;
goto err_detach;
}
mutex_lock(&acpi_device_lock);
/*
* Find suitable bus_id and instance number in acpi_bus_id_list
* If failed, create one and link it into acpi_bus_id_list
*/
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
if (!strcmp(acpi_device_bus_id->bus_id,
acpi_device_hid(device))) {
acpi_device_bus_id->instance_no++;
found = 1;
kfree(new_bus_id);
break;
}
}
if (!found) {
acpi_device_bus_id = new_bus_id;
strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
acpi_device_bus_id->instance_no = 0;
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
}
dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
if (device->parent)
list_add_tail(&device->node, &device->parent->children);
if (device->wakeup.flags.valid)
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
mutex_unlock(&acpi_device_lock);
if (device->parent)
device->dev.parent = &device->parent->dev;
device->dev.bus = &acpi_bus_type;
device->dev.release = release;
result = device_add(&device->dev);
if (result) {
dev_err(&device->dev, "Error registering device\n");
goto err;
}
result = acpi_device_setup_files(device);
if (result)
printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
dev_name(&device->dev));
device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
return 0;
err:
mutex_lock(&acpi_device_lock);
if (device->parent)
list_del(&device->node);
list_del(&device->wakeup_list);
mutex_unlock(&acpi_device_lock);
err_detach:
acpi_detach_data(device->handle, acpi_bus_data_handler);
return result;
}
static void acpi_device_unregister(struct acpi_device *device)
{
mutex_lock(&acpi_device_lock);
if (device->parent)
list_del(&device->node);
list_del(&device->wakeup_list);
mutex_unlock(&acpi_device_lock);
acpi_detach_data(device->handle, acpi_bus_data_handler);
acpi_power_add_remove_device(device, false);
acpi_device_remove_files(device);
if (device->remove)
device->remove(device);
device_del(&device->dev);
/*
* Transition the device to D3cold to drop the reference counts of all
* power resources the device depends on and turn off the ones that have
* no more references.
*/
acpi_device_set_power(device, ACPI_STATE_D3_COLD);
device->handle = NULL;
put_device(&device->dev);
}
/* --------------------------------------------------------------------------
Driver Management
-------------------------------------------------------------------------- */
/**
* acpi_bus_driver_init - add a device to a driver
* @device: the device to add and initialize
* @driver: driver for the device
*
* Used to initialize a device via its device driver. Called whenever a
* driver is bound to a device. Invokes the driver's add() ops.
*/
static int
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
{
int result = 0;
if (!device || !driver)
return -EINVAL;
if (!driver->ops.add)
return -ENOSYS;
result = driver->ops.add(device);
if (result) {
device->driver = NULL;
device->driver_data = NULL;
return result;
}
device->driver = driver;
/*
* TBD - Configuration Management: Assign resources to device based
* upon possible configuration and currently allocated resources.
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Driver successfully bound to device\n"));
return 0;
}
/**
* acpi_bus_register_driver - register a driver with the ACPI bus
* @driver: driver being registered
*
* Registers a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and binds. Returns zero for
* success or a negative error status for failure.
*/
int acpi_bus_register_driver(struct acpi_driver *driver)
{
int ret;
if (acpi_disabled)
return -ENODEV;
driver->drv.name = driver->name;
driver->drv.bus = &acpi_bus_type;
driver->drv.owner = driver->owner;
ret = driver_register(&driver->drv);
return ret;
}
EXPORT_SYMBOL(acpi_bus_register_driver);
/**
* acpi_bus_unregister_driver - unregisters a driver with the APIC bus
* @driver: driver to unregister
*
* Unregisters a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and unbinds.
*/
void acpi_bus_unregister_driver(struct acpi_driver *driver)
{
driver_unregister(&driver->drv);
}
EXPORT_SYMBOL(acpi_bus_unregister_driver);
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
struct acpi_device *device = NULL;
acpi_status status;
/*
* Fixed hardware devices do not appear in the namespace and do not
* have handles, but we fabricate acpi_devices for them, so we have
* to deal with them specially.
*/
if (!handle)
return acpi_root;
do {
status = acpi_get_parent(handle, &handle);
if (ACPI_FAILURE(status))
return status == AE_NULL_ENTRY ? NULL : acpi_root;
} while (acpi_bus_get_device(handle, &device));
return device;
}
acpi_status
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
{
acpi_status status;
acpi_handle tmp;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *obj;
status = acpi_get_handle(handle, "_EJD", &tmp);
if (ACPI_FAILURE(status))
return status;
status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
if (ACPI_SUCCESS(status)) {
obj = buffer.pointer;
status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
ejd);
kfree(buffer.pointer);
}
return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
void acpi_bus_data_handler(acpi_handle handle, void *context)
{
/* TBD */
return;
}
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
struct acpi_device_wakeup *wakeup)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *package = NULL;
union acpi_object *element = NULL;
acpi_status status;
int err = -ENODATA;
if (!wakeup)
return -EINVAL;
INIT_LIST_HEAD(&wakeup->resources);
/* _PRW */
status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
return err;
}
package = (union acpi_object *)buffer.pointer;
if (!package || package->package.count < 2)
goto out;
element = &(package->package.elements[0]);
if (!element)
goto out;
if (element->type == ACPI_TYPE_PACKAGE) {
if ((element->package.count < 2) ||
(element->package.elements[0].type !=
ACPI_TYPE_LOCAL_REFERENCE)
|| (element->package.elements[1].type != ACPI_TYPE_INTEGER))
goto out;
wakeup->gpe_device =
element->package.elements[0].reference.handle;
wakeup->gpe_number =
(u32) element->package.elements[1].integer.value;
} else if (element->type == ACPI_TYPE_INTEGER) {
wakeup->gpe_device = NULL;
wakeup->gpe_number = element->integer.value;
} else {
goto out;
}
element = &(package->package.elements[1]);
if (element->type != ACPI_TYPE_INTEGER)
goto out;
wakeup->sleep_state = element->integer.value;
err = acpi_extract_power_resources(package, 2, &wakeup->resources);
if (err)
goto out;