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17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/acpi.h>
20#include <linux/device.h>
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/list.h>
24#include <linux/miscdevice.h>
25#include <linux/module.h>
26#include <linux/platform_device.h>
27#include <linux/slab.h>
28#include <linux/types.h>
29#include <linux/uaccess.h>
30#include <linux/uuid.h>
31#include <linux/wmi.h>
32#include <uapi/linux/wmi.h>
33
34ACPI_MODULE_NAME("wmi");
35MODULE_AUTHOR("Carlos Corbacho");
36MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
37MODULE_LICENSE("GPL");
38
39static LIST_HEAD(wmi_block_list);
40
41struct guid_block {
42 char guid[16];
43 union {
44 char object_id[2];
45 struct {
46 unsigned char notify_id;
47 unsigned char reserved;
48 };
49 };
50 u8 instance_count;
51 u8 flags;
52};
53
54struct wmi_block {
55 struct wmi_device dev;
56 struct list_head list;
57 struct guid_block gblock;
58 struct miscdevice char_dev;
59 struct mutex char_mutex;
60 struct acpi_device *acpi_device;
61 wmi_notify_handler handler;
62 void *handler_data;
63 u64 req_buf_size;
64
65 bool read_takes_no_args;
66};
67
68
69
70
71
72
73#define ACPI_WMI_EXPENSIVE 0x1
74#define ACPI_WMI_METHOD 0x2
75#define ACPI_WMI_STRING 0x4
76#define ACPI_WMI_EVENT 0x8
77
78static bool debug_event;
79module_param(debug_event, bool, 0444);
80MODULE_PARM_DESC(debug_event,
81 "Log WMI Events [0/1]");
82
83static bool debug_dump_wdg;
84module_param(debug_dump_wdg, bool, 0444);
85MODULE_PARM_DESC(debug_dump_wdg,
86 "Dump available WMI interfaces [0/1]");
87
88static int acpi_wmi_remove(struct platform_device *device);
89static int acpi_wmi_probe(struct platform_device *device);
90
91static const struct acpi_device_id wmi_device_ids[] = {
92 {"PNP0C14", 0},
93 {"pnp0c14", 0},
94 {"", 0},
95};
96MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
97
98static struct platform_driver acpi_wmi_driver = {
99 .driver = {
100 .name = "acpi-wmi",
101 .acpi_match_table = wmi_device_ids,
102 },
103 .probe = acpi_wmi_probe,
104 .remove = acpi_wmi_remove,
105};
106
107
108
109
110
111static bool find_guid(const char *guid_string, struct wmi_block **out)
112{
113 uuid_le guid_input;
114 struct wmi_block *wblock;
115 struct guid_block *block;
116
117 if (uuid_le_to_bin(guid_string, &guid_input))
118 return false;
119
120 list_for_each_entry(wblock, &wmi_block_list, list) {
121 block = &wblock->gblock;
122
123 if (memcmp(block->guid, &guid_input, 16) == 0) {
124 if (out)
125 *out = wblock;
126 return true;
127 }
128 }
129 return false;
130}
131
132static const void *find_guid_context(struct wmi_block *wblock,
133 struct wmi_driver *wdriver)
134{
135 const struct wmi_device_id *id;
136 uuid_le guid_input;
137
138 if (wblock == NULL || wdriver == NULL)
139 return NULL;
140 if (wdriver->id_table == NULL)
141 return NULL;
142
143 id = wdriver->id_table;
144 while (*id->guid_string) {
145 if (uuid_le_to_bin(id->guid_string, &guid_input))
146 continue;
147 if (!memcmp(wblock->gblock.guid, &guid_input, 16))
148 return id->context;
149 id++;
150 }
151 return NULL;
152}
153
154static int get_subobj_info(acpi_handle handle, const char *pathname,
155 struct acpi_device_info **info)
156{
157 struct acpi_device_info *dummy_info, **info_ptr;
158 acpi_handle subobj_handle;
159 acpi_status status;
160
161 status = acpi_get_handle(handle, (char *)pathname, &subobj_handle);
162 if (status == AE_NOT_FOUND)
163 return -ENOENT;
164 else if (ACPI_FAILURE(status))
165 return -EIO;
166
167 info_ptr = info ? info : &dummy_info;
168 status = acpi_get_object_info(subobj_handle, info_ptr);
169 if (ACPI_FAILURE(status))
170 return -EIO;
171
172 if (!info)
173 kfree(dummy_info);
174
175 return 0;
176}
177
178static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
179{
180 struct guid_block *block = NULL;
181 char method[5];
182 acpi_status status;
183 acpi_handle handle;
184
185 block = &wblock->gblock;
186 handle = wblock->acpi_device->handle;
187
188 snprintf(method, 5, "WE%02X", block->notify_id);
189 status = acpi_execute_simple_method(handle, method, enable);
190
191 if (status != AE_OK && status != AE_NOT_FOUND)
192 return status;
193 else
194 return AE_OK;
195}
196
197
198
199
200
201
202
203
204
205
206
207
208int set_required_buffer_size(struct wmi_device *wdev, u64 length)
209{
210 struct wmi_block *wblock;
211
212 wblock = container_of(wdev, struct wmi_block, dev);
213 wblock->req_buf_size = length;
214
215 return 0;
216}
217EXPORT_SYMBOL_GPL(set_required_buffer_size);
218
219
220
221
222
223
224
225
226
227
228
229acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
230u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
231{
232 struct wmi_block *wblock = NULL;
233
234 if (!find_guid(guid_string, &wblock))
235 return AE_ERROR;
236 return wmidev_evaluate_method(&wblock->dev, instance, method_id,
237 in, out);
238}
239EXPORT_SYMBOL_GPL(wmi_evaluate_method);
240
241
242
243
244
245
246
247
248
249
250
251acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
252 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
253{
254 struct guid_block *block = NULL;
255 struct wmi_block *wblock = NULL;
256 acpi_handle handle;
257 acpi_status status;
258 struct acpi_object_list input;
259 union acpi_object params[3];
260 char method[5] = "WM";
261
262 wblock = container_of(wdev, struct wmi_block, dev);
263 block = &wblock->gblock;
264 handle = wblock->acpi_device->handle;
265
266 if (!(block->flags & ACPI_WMI_METHOD))
267 return AE_BAD_DATA;
268
269 if (block->instance_count <= instance)
270 return AE_BAD_PARAMETER;
271
272 input.count = 2;
273 input.pointer = params;
274 params[0].type = ACPI_TYPE_INTEGER;
275 params[0].integer.value = instance;
276 params[1].type = ACPI_TYPE_INTEGER;
277 params[1].integer.value = method_id;
278
279 if (in) {
280 input.count = 3;
281
282 if (block->flags & ACPI_WMI_STRING) {
283 params[2].type = ACPI_TYPE_STRING;
284 } else {
285 params[2].type = ACPI_TYPE_BUFFER;
286 }
287 params[2].buffer.length = in->length;
288 params[2].buffer.pointer = in->pointer;
289 }
290
291 strncat(method, block->object_id, 2);
292
293 status = acpi_evaluate_object(handle, method, &input, out);
294
295 return status;
296}
297EXPORT_SYMBOL_GPL(wmidev_evaluate_method);
298
299static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
300 struct acpi_buffer *out)
301{
302 struct guid_block *block = NULL;
303 acpi_handle handle;
304 acpi_status status, wc_status = AE_ERROR;
305 struct acpi_object_list input;
306 union acpi_object wq_params[1];
307 char method[5];
308 char wc_method[5] = "WC";
309
310 if (!out)
311 return AE_BAD_PARAMETER;
312
313 block = &wblock->gblock;
314 handle = wblock->acpi_device->handle;
315
316 if (block->instance_count <= instance)
317 return AE_BAD_PARAMETER;
318
319
320 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
321 return AE_ERROR;
322
323 input.count = 1;
324 input.pointer = wq_params;
325 wq_params[0].type = ACPI_TYPE_INTEGER;
326 wq_params[0].integer.value = instance;
327
328 if (instance == 0 && wblock->read_takes_no_args)
329 input.count = 0;
330
331
332
333
334
335 if (block->flags & ACPI_WMI_EXPENSIVE) {
336 strncat(wc_method, block->object_id, 2);
337
338
339
340
341
342
343 if (acpi_has_method(handle, wc_method))
344 wc_status = acpi_execute_simple_method(handle,
345 wc_method, 1);
346 }
347
348 strcpy(method, "WQ");
349 strncat(method, block->object_id, 2);
350
351 status = acpi_evaluate_object(handle, method, &input, out);
352
353
354
355
356
357 if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
358 status = acpi_execute_simple_method(handle, wc_method, 0);
359 }
360
361 return status;
362}
363
364
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369
370
371
372acpi_status wmi_query_block(const char *guid_string, u8 instance,
373 struct acpi_buffer *out)
374{
375 struct wmi_block *wblock;
376
377 if (!guid_string)
378 return AE_BAD_PARAMETER;
379
380 if (!find_guid(guid_string, &wblock))
381 return AE_ERROR;
382
383 return __query_block(wblock, instance, out);
384}
385EXPORT_SYMBOL_GPL(wmi_query_block);
386
387union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
388{
389 struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
390 struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev);
391
392 if (ACPI_FAILURE(__query_block(wblock, instance, &out)))
393 return NULL;
394
395 return (union acpi_object *)out.pointer;
396}
397EXPORT_SYMBOL_GPL(wmidev_block_query);
398
399
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401
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404
405
406
407acpi_status wmi_set_block(const char *guid_string, u8 instance,
408 const struct acpi_buffer *in)
409{
410 struct guid_block *block = NULL;
411 struct wmi_block *wblock = NULL;
412 acpi_handle handle;
413 struct acpi_object_list input;
414 union acpi_object params[2];
415 char method[5] = "WS";
416
417 if (!guid_string || !in)
418 return AE_BAD_DATA;
419
420 if (!find_guid(guid_string, &wblock))
421 return AE_ERROR;
422
423 block = &wblock->gblock;
424 handle = wblock->acpi_device->handle;
425
426 if (block->instance_count <= instance)
427 return AE_BAD_PARAMETER;
428
429
430 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
431 return AE_ERROR;
432
433 input.count = 2;
434 input.pointer = params;
435 params[0].type = ACPI_TYPE_INTEGER;
436 params[0].integer.value = instance;
437
438 if (block->flags & ACPI_WMI_STRING) {
439 params[1].type = ACPI_TYPE_STRING;
440 } else {
441 params[1].type = ACPI_TYPE_BUFFER;
442 }
443 params[1].buffer.length = in->length;
444 params[1].buffer.pointer = in->pointer;
445
446 strncat(method, block->object_id, 2);
447
448 return acpi_evaluate_object(handle, method, &input, NULL);
449}
450EXPORT_SYMBOL_GPL(wmi_set_block);
451
452static void wmi_dump_wdg(const struct guid_block *g)
453{
454 pr_info("%pUL:\n", g->guid);
455 if (g->flags & ACPI_WMI_EVENT)
456 pr_info("\tnotify_id: 0x%02X\n", g->notify_id);
457 else
458 pr_info("\tobject_id: %2pE\n", g->object_id);
459 pr_info("\tinstance_count: %d\n", g->instance_count);
460 pr_info("\tflags: %#x", g->flags);
461 if (g->flags) {
462 if (g->flags & ACPI_WMI_EXPENSIVE)
463 pr_cont(" ACPI_WMI_EXPENSIVE");
464 if (g->flags & ACPI_WMI_METHOD)
465 pr_cont(" ACPI_WMI_METHOD");
466 if (g->flags & ACPI_WMI_STRING)
467 pr_cont(" ACPI_WMI_STRING");
468 if (g->flags & ACPI_WMI_EVENT)
469 pr_cont(" ACPI_WMI_EVENT");
470 }
471 pr_cont("\n");
472
473}
474
475static void wmi_notify_debug(u32 value, void *context)
476{
477 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
478 union acpi_object *obj;
479 acpi_status status;
480
481 status = wmi_get_event_data(value, &response);
482 if (status != AE_OK) {
483 pr_info("bad event status 0x%x\n", status);
484 return;
485 }
486
487 obj = (union acpi_object *)response.pointer;
488
489 if (!obj)
490 return;
491
492 pr_info("DEBUG Event ");
493 switch(obj->type) {
494 case ACPI_TYPE_BUFFER:
495 pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
496 break;
497 case ACPI_TYPE_STRING:
498 pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
499 break;
500 case ACPI_TYPE_INTEGER:
501 pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
502 break;
503 case ACPI_TYPE_PACKAGE:
504 pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
505 break;
506 default:
507 pr_cont("object type 0x%X\n", obj->type);
508 }
509 kfree(obj);
510}
511
512
513
514
515
516
517
518
519acpi_status wmi_install_notify_handler(const char *guid,
520wmi_notify_handler handler, void *data)
521{
522 struct wmi_block *block;
523 acpi_status status = AE_NOT_EXIST;
524 uuid_le guid_input;
525
526 if (!guid || !handler)
527 return AE_BAD_PARAMETER;
528
529 if (uuid_le_to_bin(guid, &guid_input))
530 return AE_BAD_PARAMETER;
531
532 list_for_each_entry(block, &wmi_block_list, list) {
533 acpi_status wmi_status;
534
535 if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
536 if (block->handler &&
537 block->handler != wmi_notify_debug)
538 return AE_ALREADY_ACQUIRED;
539
540 block->handler = handler;
541 block->handler_data = data;
542
543 wmi_status = wmi_method_enable(block, 1);
544 if ((wmi_status != AE_OK) ||
545 ((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
546 status = wmi_status;
547 }
548 }
549
550 return status;
551}
552EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
553
554
555
556
557
558
559acpi_status wmi_remove_notify_handler(const char *guid)
560{
561 struct wmi_block *block;
562 acpi_status status = AE_NOT_EXIST;
563 uuid_le guid_input;
564
565 if (!guid)
566 return AE_BAD_PARAMETER;
567
568 if (uuid_le_to_bin(guid, &guid_input))
569 return AE_BAD_PARAMETER;
570
571 list_for_each_entry(block, &wmi_block_list, list) {
572 acpi_status wmi_status;
573
574 if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
575 if (!block->handler ||
576 block->handler == wmi_notify_debug)
577 return AE_NULL_ENTRY;
578
579 if (debug_event) {
580 block->handler = wmi_notify_debug;
581 status = AE_OK;
582 } else {
583 wmi_status = wmi_method_enable(block, 0);
584 block->handler = NULL;
585 block->handler_data = NULL;
586 if ((wmi_status != AE_OK) ||
587 ((wmi_status == AE_OK) &&
588 (status == AE_NOT_EXIST)))
589 status = wmi_status;
590 }
591 }
592 }
593
594 return status;
595}
596EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
597
598
599
600
601
602
603
604
605
606acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
607{
608 struct acpi_object_list input;
609 union acpi_object params[1];
610 struct guid_block *gblock;
611 struct wmi_block *wblock;
612
613 input.count = 1;
614 input.pointer = params;
615 params[0].type = ACPI_TYPE_INTEGER;
616 params[0].integer.value = event;
617
618 list_for_each_entry(wblock, &wmi_block_list, list) {
619 gblock = &wblock->gblock;
620
621 if ((gblock->flags & ACPI_WMI_EVENT) &&
622 (gblock->notify_id == event))
623 return acpi_evaluate_object(wblock->acpi_device->handle,
624 "_WED", &input, out);
625 }
626
627 return AE_NOT_FOUND;
628}
629EXPORT_SYMBOL_GPL(wmi_get_event_data);
630
631
632
633
634
635
636
637bool wmi_has_guid(const char *guid_string)
638{
639 return find_guid(guid_string, NULL);
640}
641EXPORT_SYMBOL_GPL(wmi_has_guid);
642
643
644
645
646
647
648
649
650
651char *wmi_get_acpi_device_uid(const char *guid_string)
652{
653 struct wmi_block *wblock = NULL;
654
655 if (!find_guid(guid_string, &wblock))
656 return NULL;
657
658 return acpi_device_uid(wblock->acpi_device);
659}
660EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid);
661
662static struct wmi_block *dev_to_wblock(struct device *dev)
663{
664 return container_of(dev, struct wmi_block, dev.dev);
665}
666
667static struct wmi_device *dev_to_wdev(struct device *dev)
668{
669 return container_of(dev, struct wmi_device, dev);
670}
671
672
673
674
675static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
676 char *buf)
677{
678 struct wmi_block *wblock = dev_to_wblock(dev);
679
680 return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid);
681}
682static DEVICE_ATTR_RO(modalias);
683
684static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
685 char *buf)
686{
687 struct wmi_block *wblock = dev_to_wblock(dev);
688
689 return sprintf(buf, "%pUL\n", wblock->gblock.guid);
690}
691static DEVICE_ATTR_RO(guid);
692
693static ssize_t instance_count_show(struct device *dev,
694 struct device_attribute *attr, char *buf)
695{
696 struct wmi_block *wblock = dev_to_wblock(dev);
697
698 return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count);
699}
700static DEVICE_ATTR_RO(instance_count);
701
702static ssize_t expensive_show(struct device *dev,
703 struct device_attribute *attr, char *buf)
704{
705 struct wmi_block *wblock = dev_to_wblock(dev);
706
707 return sprintf(buf, "%d\n",
708 (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0);
709}
710static DEVICE_ATTR_RO(expensive);
711
712static struct attribute *wmi_attrs[] = {
713 &dev_attr_modalias.attr,
714 &dev_attr_guid.attr,
715 &dev_attr_instance_count.attr,
716 &dev_attr_expensive.attr,
717 NULL,
718};
719ATTRIBUTE_GROUPS(wmi);
720
721static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr,
722 char *buf)
723{
724 struct wmi_block *wblock = dev_to_wblock(dev);
725
726 return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id);
727}
728static DEVICE_ATTR_RO(notify_id);
729
730static struct attribute *wmi_event_attrs[] = {
731 &dev_attr_notify_id.attr,
732 NULL,
733};
734ATTRIBUTE_GROUPS(wmi_event);
735
736static ssize_t object_id_show(struct device *dev, struct device_attribute *attr,
737 char *buf)
738{
739 struct wmi_block *wblock = dev_to_wblock(dev);
740
741 return sprintf(buf, "%c%c\n", wblock->gblock.object_id[0],
742 wblock->gblock.object_id[1]);
743}
744static DEVICE_ATTR_RO(object_id);
745
746static ssize_t setable_show(struct device *dev, struct device_attribute *attr,
747 char *buf)
748{
749 struct wmi_device *wdev = dev_to_wdev(dev);
750
751 return sprintf(buf, "%d\n", (int)wdev->setable);
752}
753static DEVICE_ATTR_RO(setable);
754
755static struct attribute *wmi_data_attrs[] = {
756 &dev_attr_object_id.attr,
757 &dev_attr_setable.attr,
758 NULL,
759};
760ATTRIBUTE_GROUPS(wmi_data);
761
762static struct attribute *wmi_method_attrs[] = {
763 &dev_attr_object_id.attr,
764 NULL,
765};
766ATTRIBUTE_GROUPS(wmi_method);
767
768static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
769{
770 struct wmi_block *wblock = dev_to_wblock(dev);
771
772 if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid))
773 return -ENOMEM;
774
775 if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid))
776 return -ENOMEM;
777
778 return 0;
779}
780
781static void wmi_dev_release(struct device *dev)
782{
783 struct wmi_block *wblock = dev_to_wblock(dev);
784
785 kfree(wblock);
786}
787
788static int wmi_dev_match(struct device *dev, struct device_driver *driver)
789{
790 struct wmi_driver *wmi_driver =
791 container_of(driver, struct wmi_driver, driver);
792 struct wmi_block *wblock = dev_to_wblock(dev);
793 const struct wmi_device_id *id = wmi_driver->id_table;
794
795 if (id == NULL)
796 return 0;
797
798 while (*id->guid_string) {
799 uuid_le driver_guid;
800
801 if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid)))
802 continue;
803 if (!memcmp(&driver_guid, wblock->gblock.guid, 16))
804 return 1;
805
806 id++;
807 }
808
809 return 0;
810}
811static int wmi_char_open(struct inode *inode, struct file *filp)
812{
813 const char *driver_name = filp->f_path.dentry->d_iname;
814 struct wmi_block *wblock = NULL;
815 struct wmi_block *next = NULL;
816
817 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
818 if (!wblock->dev.dev.driver)
819 continue;
820 if (strcmp(driver_name, wblock->dev.dev.driver->name) == 0) {
821 filp->private_data = wblock;
822 break;
823 }
824 }
825
826 if (!filp->private_data)
827 return -ENODEV;
828
829 return nonseekable_open(inode, filp);
830}
831
832static ssize_t wmi_char_read(struct file *filp, char __user *buffer,
833 size_t length, loff_t *offset)
834{
835 struct wmi_block *wblock = filp->private_data;
836
837 return simple_read_from_buffer(buffer, length, offset,
838 &wblock->req_buf_size,
839 sizeof(wblock->req_buf_size));
840}
841
842static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
843{
844 struct wmi_ioctl_buffer __user *input =
845 (struct wmi_ioctl_buffer __user *) arg;
846 struct wmi_block *wblock = filp->private_data;
847 struct wmi_ioctl_buffer *buf = NULL;
848 struct wmi_driver *wdriver = NULL;
849 int ret;
850
851 if (_IOC_TYPE(cmd) != WMI_IOC)
852 return -ENOTTY;
853
854
855 if (_IOC_NR(cmd) >= wblock->gblock.instance_count)
856 return -EINVAL;
857
858 mutex_lock(&wblock->char_mutex);
859 buf = wblock->handler_data;
860 if (get_user(buf->length, &input->length)) {
861 dev_dbg(&wblock->dev.dev, "Read length from user failed\n");
862 ret = -EFAULT;
863 goto out_ioctl;
864 }
865
866 if (buf->length < wblock->req_buf_size) {
867 dev_err(&wblock->dev.dev,
868 "Buffer %lld too small, need at least %lld\n",
869 buf->length, wblock->req_buf_size);
870 ret = -EINVAL;
871 goto out_ioctl;
872 }
873
874 if (buf->length > wblock->req_buf_size)
875 dev_warn(&wblock->dev.dev,
876 "Buffer %lld is bigger than required %lld\n",
877 buf->length, wblock->req_buf_size);
878
879
880 if (copy_from_user(buf, input, wblock->req_buf_size)) {
881 dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n",
882 wblock->req_buf_size);
883 ret = -EFAULT;
884 goto out_ioctl;
885 }
886
887
888 wdriver = container_of(wblock->dev.dev.driver,
889 struct wmi_driver, driver);
890 if (!try_module_get(wdriver->driver.owner)) {
891 ret = -EBUSY;
892 goto out_ioctl;
893 }
894 ret = wdriver->filter_callback(&wblock->dev, cmd, buf);
895 module_put(wdriver->driver.owner);
896 if (ret)
897 goto out_ioctl;
898
899
900 if (copy_to_user(input, buf, wblock->req_buf_size)) {
901 dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n",
902 wblock->req_buf_size);
903 ret = -EFAULT;
904 }
905
906out_ioctl:
907 mutex_unlock(&wblock->char_mutex);
908 return ret;
909}
910
911static const struct file_operations wmi_fops = {
912 .owner = THIS_MODULE,
913 .read = wmi_char_read,
914 .open = wmi_char_open,
915 .unlocked_ioctl = wmi_ioctl,
916 .compat_ioctl = wmi_ioctl,
917};
918
919static int wmi_dev_probe(struct device *dev)
920{
921 struct wmi_block *wblock = dev_to_wblock(dev);
922 struct wmi_driver *wdriver =
923 container_of(dev->driver, struct wmi_driver, driver);
924 int ret = 0;
925 char *buf;
926
927 if (ACPI_FAILURE(wmi_method_enable(wblock, 1)))
928 dev_warn(dev, "failed to enable device -- probing anyway\n");
929
930 if (wdriver->probe) {
931 ret = wdriver->probe(dev_to_wdev(dev),
932 find_guid_context(wblock, wdriver));
933 if (ret != 0)
934 goto probe_failure;
935 }
936
937
938 if (wdriver->filter_callback) {
939
940 if (!wblock->req_buf_size) {
941 dev_err(&wblock->dev.dev,
942 "Required buffer size not set\n");
943 ret = -EINVAL;
944 goto probe_failure;
945 }
946
947 wblock->handler_data = kmalloc(wblock->req_buf_size,
948 GFP_KERNEL);
949 if (!wblock->handler_data) {
950 ret = -ENOMEM;
951 goto probe_failure;
952 }
953
954 buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name);
955 if (!buf) {
956 ret = -ENOMEM;
957 goto probe_string_failure;
958 }
959 wblock->char_dev.minor = MISC_DYNAMIC_MINOR;
960 wblock->char_dev.name = buf;
961 wblock->char_dev.fops = &wmi_fops;
962 wblock->char_dev.mode = 0444;
963 ret = misc_register(&wblock->char_dev);
964 if (ret) {
965 dev_warn(dev, "failed to register char dev: %d\n", ret);
966 ret = -ENOMEM;
967 goto probe_misc_failure;
968 }
969 }
970
971 return 0;
972
973probe_misc_failure:
974 kfree(buf);
975probe_string_failure:
976 kfree(wblock->handler_data);
977probe_failure:
978 if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
979 dev_warn(dev, "failed to disable device\n");
980 return ret;
981}
982
983static int wmi_dev_remove(struct device *dev)
984{
985 struct wmi_block *wblock = dev_to_wblock(dev);
986 struct wmi_driver *wdriver =
987 container_of(dev->driver, struct wmi_driver, driver);
988 int ret = 0;
989
990 if (wdriver->filter_callback) {
991 misc_deregister(&wblock->char_dev);
992 kfree(wblock->char_dev.name);
993 kfree(wblock->handler_data);
994 }
995
996 if (wdriver->remove)
997 ret = wdriver->remove(dev_to_wdev(dev));
998
999 if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
1000 dev_warn(dev, "failed to disable device\n");
1001
1002 return ret;
1003}
1004
1005static struct class wmi_bus_class = {
1006 .name = "wmi_bus",
1007};
1008
1009static struct bus_type wmi_bus_type = {
1010 .name = "wmi",
1011 .dev_groups = wmi_groups,
1012 .match = wmi_dev_match,
1013 .uevent = wmi_dev_uevent,
1014 .probe = wmi_dev_probe,
1015 .remove = wmi_dev_remove,
1016};
1017
1018static const struct device_type wmi_type_event = {
1019 .name = "event",
1020 .groups = wmi_event_groups,
1021 .release = wmi_dev_release,
1022};
1023
1024static const struct device_type wmi_type_method = {
1025 .name = "method",
1026 .groups = wmi_method_groups,
1027 .release = wmi_dev_release,
1028};
1029
1030static const struct device_type wmi_type_data = {
1031 .name = "data",
1032 .groups = wmi_data_groups,
1033 .release = wmi_dev_release,
1034};
1035
1036static int wmi_create_device(struct device *wmi_bus_dev,
1037 const struct guid_block *gblock,
1038 struct wmi_block *wblock,
1039 struct acpi_device *device)
1040{
1041 struct acpi_device_info *info;
1042 char method[5];
1043 int result;
1044
1045 if (gblock->flags & ACPI_WMI_EVENT) {
1046 wblock->dev.dev.type = &wmi_type_event;
1047 goto out_init;
1048 }
1049
1050 if (gblock->flags & ACPI_WMI_METHOD) {
1051 wblock->dev.dev.type = &wmi_type_method;
1052 mutex_init(&wblock->char_mutex);
1053 goto out_init;
1054 }
1055
1056
1057
1058
1059
1060
1061 strcpy(method, "WQ");
1062 strncat(method, wblock->gblock.object_id, 2);
1063 result = get_subobj_info(device->handle, method, &info);
1064
1065 if (result) {
1066 dev_warn(wmi_bus_dev,
1067 "%s data block query control method not found\n",
1068 method);
1069 return result;
1070 }
1071
1072 wblock->dev.dev.type = &wmi_type_data;
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084 if (info->type != ACPI_TYPE_METHOD || info->param_count == 0)
1085 wblock->read_takes_no_args = true;
1086
1087 kfree(info);
1088
1089 strcpy(method, "WS");
1090 strncat(method, wblock->gblock.object_id, 2);
1091 result = get_subobj_info(device->handle, method, NULL);
1092
1093 if (result == 0)
1094 wblock->dev.setable = true;
1095
1096 out_init:
1097 wblock->dev.dev.bus = &wmi_bus_type;
1098 wblock->dev.dev.parent = wmi_bus_dev;
1099
1100 dev_set_name(&wblock->dev.dev, "%pUL", gblock->guid);
1101
1102 device_initialize(&wblock->dev.dev);
1103
1104 return 0;
1105}
1106
1107static void wmi_free_devices(struct acpi_device *device)
1108{
1109 struct wmi_block *wblock, *next;
1110
1111
1112 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
1113 if (wblock->acpi_device == device) {
1114 list_del(&wblock->list);
1115 device_unregister(&wblock->dev.dev);
1116 }
1117 }
1118}
1119
1120static bool guid_already_parsed(struct acpi_device *device,
1121 const u8 *guid)
1122{
1123 struct wmi_block *wblock;
1124
1125 list_for_each_entry(wblock, &wmi_block_list, list) {
1126 if (memcmp(wblock->gblock.guid, guid, 16) == 0) {
1127
1128
1129
1130
1131
1132
1133 dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n",
1134 guid, dev_name(&wblock->acpi_device->dev));
1135 return true;
1136 }
1137 }
1138
1139 return false;
1140}
1141
1142
1143
1144
1145static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
1146{
1147 struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
1148 const struct guid_block *gblock;
1149 struct wmi_block *wblock, *next;
1150 union acpi_object *obj;
1151 acpi_status status;
1152 int retval = 0;
1153 u32 i, total;
1154
1155 status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out);
1156 if (ACPI_FAILURE(status))
1157 return -ENXIO;
1158
1159 obj = (union acpi_object *) out.pointer;
1160 if (!obj)
1161 return -ENXIO;
1162
1163 if (obj->type != ACPI_TYPE_BUFFER) {
1164 retval = -ENXIO;
1165 goto out_free_pointer;
1166 }
1167
1168 gblock = (const struct guid_block *)obj->buffer.pointer;
1169 total = obj->buffer.length / sizeof(struct guid_block);
1170
1171 for (i = 0; i < total; i++) {
1172 if (debug_dump_wdg)
1173 wmi_dump_wdg(&gblock[i]);
1174
1175
1176
1177
1178
1179
1180
1181 if (guid_already_parsed(device, gblock[i].guid))
1182 continue;
1183
1184 wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
1185 if (!wblock) {
1186 retval = -ENOMEM;
1187 break;
1188 }
1189
1190 wblock->acpi_device = device;
1191 wblock->gblock = gblock[i];
1192
1193 retval = wmi_create_device(wmi_bus_dev, &gblock[i], wblock, device);
1194 if (retval) {
1195 kfree(wblock);
1196 continue;
1197 }
1198
1199 list_add_tail(&wblock->list, &wmi_block_list);
1200
1201 if (debug_event) {
1202 wblock->handler = wmi_notify_debug;
1203 wmi_method_enable(wblock, 1);
1204 }
1205 }
1206
1207
1208
1209
1210
1211 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
1212 if (wblock->acpi_device != device)
1213 continue;
1214
1215 retval = device_add(&wblock->dev.dev);
1216 if (retval) {
1217 dev_err(wmi_bus_dev, "failed to register %pUL\n",
1218 wblock->gblock.guid);
1219 if (debug_event)
1220 wmi_method_enable(wblock, 0);
1221 list_del(&wblock->list);
1222 put_device(&wblock->dev.dev);
1223 }
1224 }
1225
1226out_free_pointer:
1227 kfree(out.pointer);
1228 return retval;
1229}
1230
1231
1232
1233
1234
1235static acpi_status
1236acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
1237 u32 bits, u64 *value,
1238 void *handler_context, void *region_context)
1239{
1240 int result = 0, i = 0;
1241 u8 temp = 0;
1242
1243 if ((address > 0xFF) || !value)
1244 return AE_BAD_PARAMETER;
1245
1246 if (function != ACPI_READ && function != ACPI_WRITE)
1247 return AE_BAD_PARAMETER;
1248
1249 if (bits != 8)
1250 return AE_BAD_PARAMETER;
1251
1252 if (function == ACPI_READ) {
1253 result = ec_read(address, &temp);
1254 (*value) |= ((u64)temp) << i;
1255 } else {
1256 temp = 0xff & ((*value) >> i);
1257 result = ec_write(address, temp);
1258 }
1259
1260 switch (result) {
1261 case -EINVAL:
1262 return AE_BAD_PARAMETER;
1263 break;
1264 case -ENODEV:
1265 return AE_NOT_FOUND;
1266 break;
1267 case -ETIME:
1268 return AE_TIME;
1269 break;
1270 default:
1271 return AE_OK;
1272 }
1273}
1274
1275static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
1276 void *context)
1277{
1278 struct guid_block *block;
1279 struct wmi_block *wblock;
1280 bool found_it = false;
1281
1282 list_for_each_entry(wblock, &wmi_block_list, list) {
1283 block = &wblock->gblock;
1284
1285 if (wblock->acpi_device->handle == handle &&
1286 (block->flags & ACPI_WMI_EVENT) &&
1287 (block->notify_id == event))
1288 {
1289 found_it = true;
1290 break;
1291 }
1292 }
1293
1294 if (!found_it)
1295 return;
1296
1297
1298 if (wblock->dev.dev.driver) {
1299 struct wmi_driver *driver;
1300 struct acpi_object_list input;
1301 union acpi_object params[1];
1302 struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL };
1303 acpi_status status;
1304
1305 driver = container_of(wblock->dev.dev.driver,
1306 struct wmi_driver, driver);
1307
1308 input.count = 1;
1309 input.pointer = params;
1310 params[0].type = ACPI_TYPE_INTEGER;
1311 params[0].integer.value = event;
1312
1313 status = acpi_evaluate_object(wblock->acpi_device->handle,
1314 "_WED", &input, &evdata);
1315 if (ACPI_FAILURE(status)) {
1316 dev_warn(&wblock->dev.dev,
1317 "failed to get event data\n");
1318 return;
1319 }
1320
1321 if (driver->notify)
1322 driver->notify(&wblock->dev,
1323 (union acpi_object *)evdata.pointer);
1324
1325 kfree(evdata.pointer);
1326 } else if (wblock->handler) {
1327
1328 wblock->handler(event, wblock->handler_data);
1329 }
1330
1331 if (debug_event) {
1332 pr_info("DEBUG Event GUID: %pUL\n",
1333 wblock->gblock.guid);
1334 }
1335
1336 acpi_bus_generate_netlink_event(
1337 wblock->acpi_device->pnp.device_class,
1338 dev_name(&wblock->dev.dev),
1339 event, 0);
1340
1341}
1342
1343static int acpi_wmi_remove(struct platform_device *device)
1344{
1345 struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
1346
1347 acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
1348 acpi_wmi_notify_handler);
1349 acpi_remove_address_space_handler(acpi_device->handle,
1350 ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
1351 wmi_free_devices(acpi_device);
1352 device_destroy(&wmi_bus_class, MKDEV(0, 0));
1353
1354 return 0;
1355}
1356
1357static int acpi_wmi_probe(struct platform_device *device)
1358{
1359 struct acpi_device *acpi_device;
1360 struct device *wmi_bus_dev;
1361 acpi_status status;
1362 int error;
1363
1364 acpi_device = ACPI_COMPANION(&device->dev);
1365 if (!acpi_device) {
1366 dev_err(&device->dev, "ACPI companion is missing\n");
1367 return -ENODEV;
1368 }
1369
1370 status = acpi_install_address_space_handler(acpi_device->handle,
1371 ACPI_ADR_SPACE_EC,
1372 &acpi_wmi_ec_space_handler,
1373 NULL, NULL);
1374 if (ACPI_FAILURE(status)) {
1375 dev_err(&device->dev, "Error installing EC region handler\n");
1376 return -ENODEV;
1377 }
1378
1379 status = acpi_install_notify_handler(acpi_device->handle,
1380 ACPI_DEVICE_NOTIFY,
1381 acpi_wmi_notify_handler,
1382 NULL);
1383 if (ACPI_FAILURE(status)) {
1384 dev_err(&device->dev, "Error installing notify handler\n");
1385 error = -ENODEV;
1386 goto err_remove_ec_handler;
1387 }
1388
1389 wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0),
1390 NULL, "wmi_bus-%s", dev_name(&device->dev));
1391 if (IS_ERR(wmi_bus_dev)) {
1392 error = PTR_ERR(wmi_bus_dev);
1393 goto err_remove_notify_handler;
1394 }
1395 dev_set_drvdata(&device->dev, wmi_bus_dev);
1396
1397 error = parse_wdg(wmi_bus_dev, acpi_device);
1398 if (error) {
1399 pr_err("Failed to parse WDG method\n");
1400 goto err_remove_busdev;
1401 }
1402
1403 return 0;
1404
1405err_remove_busdev:
1406 device_destroy(&wmi_bus_class, MKDEV(0, 0));
1407
1408err_remove_notify_handler:
1409 acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
1410 acpi_wmi_notify_handler);
1411
1412err_remove_ec_handler:
1413 acpi_remove_address_space_handler(acpi_device->handle,
1414 ACPI_ADR_SPACE_EC,
1415 &acpi_wmi_ec_space_handler);
1416
1417 return error;
1418}
1419
1420int __must_check __wmi_driver_register(struct wmi_driver *driver,
1421 struct module *owner)
1422{
1423 driver->driver.owner = owner;
1424 driver->driver.bus = &wmi_bus_type;
1425
1426 return driver_register(&driver->driver);
1427}
1428EXPORT_SYMBOL(__wmi_driver_register);
1429
1430void wmi_driver_unregister(struct wmi_driver *driver)
1431{
1432 driver_unregister(&driver->driver);
1433}
1434EXPORT_SYMBOL(wmi_driver_unregister);
1435
1436static int __init acpi_wmi_init(void)
1437{
1438 int error;
1439
1440 if (acpi_disabled)
1441 return -ENODEV;
1442
1443 error = class_register(&wmi_bus_class);
1444 if (error)
1445 return error;
1446
1447 error = bus_register(&wmi_bus_type);
1448 if (error)
1449 goto err_unreg_class;
1450
1451 error = platform_driver_register(&acpi_wmi_driver);
1452 if (error) {
1453 pr_err("Error loading mapper\n");
1454 goto err_unreg_bus;
1455 }
1456
1457 return 0;
1458
1459err_unreg_bus:
1460 bus_unregister(&wmi_bus_type);
1461
1462err_unreg_class:
1463 class_unregister(&wmi_bus_class);
1464
1465 return error;
1466}
1467
1468static void __exit acpi_wmi_exit(void)
1469{
1470 platform_driver_unregister(&acpi_wmi_driver);
1471 bus_unregister(&wmi_bus_type);
1472 class_unregister(&wmi_bus_class);
1473}
1474
1475subsys_initcall_sync(acpi_wmi_init);
1476module_exit(acpi_wmi_exit);
1477