1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ACPI-WMI mapping driver
4 *
5 * Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
6 *
7 * GUID parsing code from ldm.c is:
8 * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
9 * Copyright (c) 2001-2007 Anton Altaparmakov
10 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
11 *
12 * WMI bus infrastructure by Andrew Lutomirski and Darren Hart:
13 * Copyright (C) 2015 Andrew Lutomirski
14 * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
15 */
16
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 <linux/fs.h>
33 #include <uapi/linux/wmi.h>
34
35 MODULE_AUTHOR("Carlos Corbacho");
36 MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
37 MODULE_LICENSE("GPL");
38
39 static LIST_HEAD(wmi_block_list);
40
41 struct guid_block {
42 guid_t guid;
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
54 enum { /* wmi_block flags */
55 WMI_READ_TAKES_NO_ARGS,
56 WMI_PROBED,
57 };
58
59 struct wmi_block {
60 struct wmi_device dev;
61 struct list_head list;
62 struct guid_block gblock;
63 struct miscdevice char_dev;
64 struct mutex char_mutex;
65 struct acpi_device *acpi_device;
66 wmi_notify_handler handler;
67 void *handler_data;
68 u64 req_buf_size;
69 unsigned long flags;
70 };
71
72
73 /*
74 * If the GUID data block is marked as expensive, we must enable and
75 * explicitily disable data collection.
76 */
77 #define ACPI_WMI_EXPENSIVE 0x1
78 #define ACPI_WMI_METHOD 0x2 /* GUID is a method */
79 #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
80 #define ACPI_WMI_EVENT 0x8 /* GUID is an event */
81
82 static bool debug_event;
83 module_param(debug_event, bool, 0444);
84 MODULE_PARM_DESC(debug_event,
85 "Log WMI Events [0/1]");
86
87 static bool debug_dump_wdg;
88 module_param(debug_dump_wdg, bool, 0444);
89 MODULE_PARM_DESC(debug_dump_wdg,
90 "Dump available WMI interfaces [0/1]");
91
92 static int acpi_wmi_remove(struct platform_device *device);
93 static int acpi_wmi_probe(struct platform_device *device);
94
95 static const struct acpi_device_id wmi_device_ids[] = {
96 {"PNP0C14", 0},
97 {"pnp0c14", 0},
98 {"", 0},
99 };
100 MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
101
102 /* allow duplicate GUIDs as these device drivers use struct wmi_driver */
103 static const char * const allow_duplicates[] = {
104 "05901221-D566-11D1-B2F0-00A0C9062910", /* wmi-bmof */
105 NULL
106 };
107
108 static struct platform_driver acpi_wmi_driver = {
109 .driver = {
110 .name = "acpi-wmi",
111 .acpi_match_table = wmi_device_ids,
112 },
113 .probe = acpi_wmi_probe,
114 .remove = acpi_wmi_remove,
115 };
116
117 /*
118 * GUID parsing functions
119 */
120
find_guid(const char * guid_string,struct wmi_block ** out)121 static bool find_guid(const char *guid_string, struct wmi_block **out)
122 {
123 guid_t guid_input;
124 struct wmi_block *wblock;
125 struct guid_block *block;
126
127 if (guid_parse(guid_string, &guid_input))
128 return false;
129
130 list_for_each_entry(wblock, &wmi_block_list, list) {
131 block = &wblock->gblock;
132
133 if (guid_equal(&block->guid, &guid_input)) {
134 if (out)
135 *out = wblock;
136 return true;
137 }
138 }
139 return false;
140 }
141
guid_parse_and_compare(const char * string,const guid_t * guid)142 static bool guid_parse_and_compare(const char *string, const guid_t *guid)
143 {
144 guid_t guid_input;
145
146 if (guid_parse(string, &guid_input))
147 return false;
148
149 return guid_equal(&guid_input, guid);
150 }
151
find_guid_context(struct wmi_block * wblock,struct wmi_driver * wdriver)152 static const void *find_guid_context(struct wmi_block *wblock,
153 struct wmi_driver *wdriver)
154 {
155 const struct wmi_device_id *id;
156
157 if (wblock == NULL || wdriver == NULL)
158 return NULL;
159 if (wdriver->id_table == NULL)
160 return NULL;
161
162 id = wdriver->id_table;
163 while (*id->guid_string) {
164 if (guid_parse_and_compare(id->guid_string, &wblock->gblock.guid))
165 return id->context;
166 id++;
167 }
168 return NULL;
169 }
170
get_subobj_info(acpi_handle handle,const char * pathname,struct acpi_device_info ** info)171 static int get_subobj_info(acpi_handle handle, const char *pathname,
172 struct acpi_device_info **info)
173 {
174 struct acpi_device_info *dummy_info, **info_ptr;
175 acpi_handle subobj_handle;
176 acpi_status status;
177
178 status = acpi_get_handle(handle, (char *)pathname, &subobj_handle);
179 if (status == AE_NOT_FOUND)
180 return -ENOENT;
181 else if (ACPI_FAILURE(status))
182 return -EIO;
183
184 info_ptr = info ? info : &dummy_info;
185 status = acpi_get_object_info(subobj_handle, info_ptr);
186 if (ACPI_FAILURE(status))
187 return -EIO;
188
189 if (!info)
190 kfree(dummy_info);
191
192 return 0;
193 }
194
wmi_method_enable(struct wmi_block * wblock,int enable)195 static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
196 {
197 struct guid_block *block;
198 char method[5];
199 acpi_status status;
200 acpi_handle handle;
201
202 block = &wblock->gblock;
203 handle = wblock->acpi_device->handle;
204
205 snprintf(method, 5, "WE%02X", block->notify_id);
206 status = acpi_execute_simple_method(handle, method, enable);
207
208 if (status != AE_OK && status != AE_NOT_FOUND)
209 return status;
210 else
211 return AE_OK;
212 }
213
214 /*
215 * Exported WMI functions
216 */
217
218 /**
219 * set_required_buffer_size - Sets the buffer size needed for performing IOCTL
220 * @wdev: A wmi bus device from a driver
221 * @length: Required buffer size
222 *
223 * Allocates memory needed for buffer, stores the buffer size in that memory
224 */
set_required_buffer_size(struct wmi_device * wdev,u64 length)225 int set_required_buffer_size(struct wmi_device *wdev, u64 length)
226 {
227 struct wmi_block *wblock;
228
229 wblock = container_of(wdev, struct wmi_block, dev);
230 wblock->req_buf_size = length;
231
232 return 0;
233 }
234 EXPORT_SYMBOL_GPL(set_required_buffer_size);
235
236 /**
237 * wmi_evaluate_method - Evaluate a WMI method
238 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
239 * @instance: Instance index
240 * @method_id: Method ID to call
241 * @in: Buffer containing input for the method call
242 * @out: Empty buffer to return the method results
243 *
244 * Call an ACPI-WMI method
245 */
wmi_evaluate_method(const char * guid_string,u8 instance,u32 method_id,const struct acpi_buffer * in,struct acpi_buffer * out)246 acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
247 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
248 {
249 struct wmi_block *wblock = NULL;
250
251 if (!find_guid(guid_string, &wblock))
252 return AE_ERROR;
253 return wmidev_evaluate_method(&wblock->dev, instance, method_id,
254 in, out);
255 }
256 EXPORT_SYMBOL_GPL(wmi_evaluate_method);
257
258 /**
259 * wmidev_evaluate_method - Evaluate a WMI method
260 * @wdev: A wmi bus device from a driver
261 * @instance: Instance index
262 * @method_id: Method ID to call
263 * @in: Buffer containing input for the method call
264 * @out: Empty buffer to return the method results
265 *
266 * Call an ACPI-WMI method
267 */
wmidev_evaluate_method(struct wmi_device * wdev,u8 instance,u32 method_id,const struct acpi_buffer * in,struct acpi_buffer * out)268 acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
269 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
270 {
271 struct guid_block *block;
272 struct wmi_block *wblock;
273 acpi_handle handle;
274 acpi_status status;
275 struct acpi_object_list input;
276 union acpi_object params[3];
277 char method[5] = "WM";
278
279 wblock = container_of(wdev, struct wmi_block, dev);
280 block = &wblock->gblock;
281 handle = wblock->acpi_device->handle;
282
283 if (!(block->flags & ACPI_WMI_METHOD))
284 return AE_BAD_DATA;
285
286 if (block->instance_count <= instance)
287 return AE_BAD_PARAMETER;
288
289 input.count = 2;
290 input.pointer = params;
291 params[0].type = ACPI_TYPE_INTEGER;
292 params[0].integer.value = instance;
293 params[1].type = ACPI_TYPE_INTEGER;
294 params[1].integer.value = method_id;
295
296 if (in) {
297 input.count = 3;
298
299 if (block->flags & ACPI_WMI_STRING) {
300 params[2].type = ACPI_TYPE_STRING;
301 } else {
302 params[2].type = ACPI_TYPE_BUFFER;
303 }
304 params[2].buffer.length = in->length;
305 params[2].buffer.pointer = in->pointer;
306 }
307
308 strncat(method, block->object_id, 2);
309
310 status = acpi_evaluate_object(handle, method, &input, out);
311
312 return status;
313 }
314 EXPORT_SYMBOL_GPL(wmidev_evaluate_method);
315
__query_block(struct wmi_block * wblock,u8 instance,struct acpi_buffer * out)316 static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
317 struct acpi_buffer *out)
318 {
319 struct guid_block *block;
320 acpi_handle handle;
321 acpi_status status, wc_status = AE_ERROR;
322 struct acpi_object_list input;
323 union acpi_object wq_params[1];
324 char method[5];
325 char wc_method[5] = "WC";
326
327 if (!out)
328 return AE_BAD_PARAMETER;
329
330 block = &wblock->gblock;
331 handle = wblock->acpi_device->handle;
332
333 if (block->instance_count <= instance)
334 return AE_BAD_PARAMETER;
335
336 /* Check GUID is a data block */
337 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
338 return AE_ERROR;
339
340 input.count = 1;
341 input.pointer = wq_params;
342 wq_params[0].type = ACPI_TYPE_INTEGER;
343 wq_params[0].integer.value = instance;
344
345 if (instance == 0 && test_bit(WMI_READ_TAKES_NO_ARGS, &wblock->flags))
346 input.count = 0;
347
348 /*
349 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
350 * enable collection.
351 */
352 if (block->flags & ACPI_WMI_EXPENSIVE) {
353 strncat(wc_method, block->object_id, 2);
354
355 /*
356 * Some GUIDs break the specification by declaring themselves
357 * expensive, but have no corresponding WCxx method. So we
358 * should not fail if this happens.
359 */
360 wc_status = acpi_execute_simple_method(handle, wc_method, 1);
361 }
362
363 strcpy(method, "WQ");
364 strncat(method, block->object_id, 2);
365
366 status = acpi_evaluate_object(handle, method, &input, out);
367
368 /*
369 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
370 * the WQxx method failed - we should disable collection anyway.
371 */
372 if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
373 /*
374 * Ignore whether this WCxx call succeeds or not since
375 * the previously executed WQxx method call might have
376 * succeeded, and returning the failing status code
377 * of this call would throw away the result of the WQxx
378 * call, potentially leaking memory.
379 */
380 acpi_execute_simple_method(handle, wc_method, 0);
381 }
382
383 return status;
384 }
385
386 /**
387 * wmi_query_block - Return contents of a WMI block (deprecated)
388 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
389 * @instance: Instance index
390 * @out: Empty buffer to return the contents of the data block to
391 *
392 * Return the contents of an ACPI-WMI data block to a buffer
393 */
wmi_query_block(const char * guid_string,u8 instance,struct acpi_buffer * out)394 acpi_status wmi_query_block(const char *guid_string, u8 instance,
395 struct acpi_buffer *out)
396 {
397 struct wmi_block *wblock;
398
399 if (!guid_string)
400 return AE_BAD_PARAMETER;
401
402 if (!find_guid(guid_string, &wblock))
403 return AE_ERROR;
404
405 return __query_block(wblock, instance, out);
406 }
407 EXPORT_SYMBOL_GPL(wmi_query_block);
408
wmidev_block_query(struct wmi_device * wdev,u8 instance)409 union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
410 {
411 struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
412 struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev);
413
414 if (ACPI_FAILURE(__query_block(wblock, instance, &out)))
415 return NULL;
416
417 return (union acpi_object *)out.pointer;
418 }
419 EXPORT_SYMBOL_GPL(wmidev_block_query);
420
421 /**
422 * wmi_set_block - Write to a WMI block
423 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
424 * @instance: Instance index
425 * @in: Buffer containing new values for the data block
426 *
427 * Write the contents of the input buffer to an ACPI-WMI data block
428 */
wmi_set_block(const char * guid_string,u8 instance,const struct acpi_buffer * in)429 acpi_status wmi_set_block(const char *guid_string, u8 instance,
430 const struct acpi_buffer *in)
431 {
432 struct wmi_block *wblock = NULL;
433 struct guid_block *block;
434 acpi_handle handle;
435 struct acpi_object_list input;
436 union acpi_object params[2];
437 char method[5] = "WS";
438
439 if (!guid_string || !in)
440 return AE_BAD_DATA;
441
442 if (!find_guid(guid_string, &wblock))
443 return AE_ERROR;
444
445 block = &wblock->gblock;
446 handle = wblock->acpi_device->handle;
447
448 if (block->instance_count <= instance)
449 return AE_BAD_PARAMETER;
450
451 /* Check GUID is a data block */
452 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
453 return AE_ERROR;
454
455 input.count = 2;
456 input.pointer = params;
457 params[0].type = ACPI_TYPE_INTEGER;
458 params[0].integer.value = instance;
459
460 if (block->flags & ACPI_WMI_STRING) {
461 params[1].type = ACPI_TYPE_STRING;
462 } else {
463 params[1].type = ACPI_TYPE_BUFFER;
464 }
465 params[1].buffer.length = in->length;
466 params[1].buffer.pointer = in->pointer;
467
468 strncat(method, block->object_id, 2);
469
470 return acpi_evaluate_object(handle, method, &input, NULL);
471 }
472 EXPORT_SYMBOL_GPL(wmi_set_block);
473
wmi_dump_wdg(const struct guid_block * g)474 static void wmi_dump_wdg(const struct guid_block *g)
475 {
476 pr_info("%pUL:\n", &g->guid);
477 if (g->flags & ACPI_WMI_EVENT)
478 pr_info("\tnotify_id: 0x%02X\n", g->notify_id);
479 else
480 pr_info("\tobject_id: %2pE\n", g->object_id);
481 pr_info("\tinstance_count: %d\n", g->instance_count);
482 pr_info("\tflags: %#x", g->flags);
483 if (g->flags) {
484 if (g->flags & ACPI_WMI_EXPENSIVE)
485 pr_cont(" ACPI_WMI_EXPENSIVE");
486 if (g->flags & ACPI_WMI_METHOD)
487 pr_cont(" ACPI_WMI_METHOD");
488 if (g->flags & ACPI_WMI_STRING)
489 pr_cont(" ACPI_WMI_STRING");
490 if (g->flags & ACPI_WMI_EVENT)
491 pr_cont(" ACPI_WMI_EVENT");
492 }
493 pr_cont("\n");
494
495 }
496
wmi_notify_debug(u32 value,void * context)497 static void wmi_notify_debug(u32 value, void *context)
498 {
499 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
500 union acpi_object *obj;
501 acpi_status status;
502
503 status = wmi_get_event_data(value, &response);
504 if (status != AE_OK) {
505 pr_info("bad event status 0x%x\n", status);
506 return;
507 }
508
509 obj = (union acpi_object *)response.pointer;
510
511 if (!obj)
512 return;
513
514 pr_info("DEBUG Event ");
515 switch(obj->type) {
516 case ACPI_TYPE_BUFFER:
517 pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
518 break;
519 case ACPI_TYPE_STRING:
520 pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
521 break;
522 case ACPI_TYPE_INTEGER:
523 pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
524 break;
525 case ACPI_TYPE_PACKAGE:
526 pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
527 break;
528 default:
529 pr_cont("object type 0x%X\n", obj->type);
530 }
531 kfree(obj);
532 }
533
534 /**
535 * wmi_install_notify_handler - Register handler for WMI events
536 * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
537 * @handler: Function to handle notifications
538 * @data: Data to be returned to handler when event is fired
539 *
540 * Register a handler for events sent to the ACPI-WMI mapper device.
541 */
wmi_install_notify_handler(const char * guid,wmi_notify_handler handler,void * data)542 acpi_status wmi_install_notify_handler(const char *guid,
543 wmi_notify_handler handler, void *data)
544 {
545 struct wmi_block *block;
546 acpi_status status = AE_NOT_EXIST;
547 guid_t guid_input;
548
549 if (!guid || !handler)
550 return AE_BAD_PARAMETER;
551
552 if (guid_parse(guid, &guid_input))
553 return AE_BAD_PARAMETER;
554
555 list_for_each_entry(block, &wmi_block_list, list) {
556 acpi_status wmi_status;
557
558 if (guid_equal(&block->gblock.guid, &guid_input)) {
559 if (block->handler &&
560 block->handler != wmi_notify_debug)
561 return AE_ALREADY_ACQUIRED;
562
563 block->handler = handler;
564 block->handler_data = data;
565
566 wmi_status = wmi_method_enable(block, 1);
567 if ((wmi_status != AE_OK) ||
568 ((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
569 status = wmi_status;
570 }
571 }
572
573 return status;
574 }
575 EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
576
577 /**
578 * wmi_uninstall_notify_handler - Unregister handler for WMI events
579 * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
580 *
581 * Unregister handler for events sent to the ACPI-WMI mapper device.
582 */
wmi_remove_notify_handler(const char * guid)583 acpi_status wmi_remove_notify_handler(const char *guid)
584 {
585 struct wmi_block *block;
586 acpi_status status = AE_NOT_EXIST;
587 guid_t guid_input;
588
589 if (!guid)
590 return AE_BAD_PARAMETER;
591
592 if (guid_parse(guid, &guid_input))
593 return AE_BAD_PARAMETER;
594
595 list_for_each_entry(block, &wmi_block_list, list) {
596 acpi_status wmi_status;
597
598 if (guid_equal(&block->gblock.guid, &guid_input)) {
599 if (!block->handler ||
600 block->handler == wmi_notify_debug)
601 return AE_NULL_ENTRY;
602
603 if (debug_event) {
604 block->handler = wmi_notify_debug;
605 status = AE_OK;
606 } else {
607 wmi_status = wmi_method_enable(block, 0);
608 block->handler = NULL;
609 block->handler_data = NULL;
610 if ((wmi_status != AE_OK) ||
611 ((wmi_status == AE_OK) &&
612 (status == AE_NOT_EXIST)))
613 status = wmi_status;
614 }
615 }
616 }
617
618 return status;
619 }
620 EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
621
622 /**
623 * wmi_get_event_data - Get WMI data associated with an event
624 *
625 * @event: Event to find
626 * @out: Buffer to hold event data. out->pointer should be freed with kfree()
627 *
628 * Returns extra data associated with an event in WMI.
629 */
wmi_get_event_data(u32 event,struct acpi_buffer * out)630 acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
631 {
632 struct acpi_object_list input;
633 union acpi_object params[1];
634 struct wmi_block *wblock;
635
636 input.count = 1;
637 input.pointer = params;
638 params[0].type = ACPI_TYPE_INTEGER;
639 params[0].integer.value = event;
640
641 list_for_each_entry(wblock, &wmi_block_list, list) {
642 struct guid_block *gblock = &wblock->gblock;
643
644 if ((gblock->flags & ACPI_WMI_EVENT) &&
645 (gblock->notify_id == event))
646 return acpi_evaluate_object(wblock->acpi_device->handle,
647 "_WED", &input, out);
648 }
649
650 return AE_NOT_FOUND;
651 }
652 EXPORT_SYMBOL_GPL(wmi_get_event_data);
653
654 /**
655 * wmi_has_guid - Check if a GUID is available
656 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
657 *
658 * Check if a given GUID is defined by _WDG
659 */
wmi_has_guid(const char * guid_string)660 bool wmi_has_guid(const char *guid_string)
661 {
662 return find_guid(guid_string, NULL);
663 }
664 EXPORT_SYMBOL_GPL(wmi_has_guid);
665
666 /**
667 * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID
668 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
669 *
670 * Find the _UID of ACPI device associated with this WMI GUID.
671 *
672 * Return: The ACPI _UID field value or NULL if the WMI GUID was not found
673 */
wmi_get_acpi_device_uid(const char * guid_string)674 char *wmi_get_acpi_device_uid(const char *guid_string)
675 {
676 struct wmi_block *wblock = NULL;
677
678 if (!find_guid(guid_string, &wblock))
679 return NULL;
680
681 return acpi_device_uid(wblock->acpi_device);
682 }
683 EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid);
684
dev_to_wblock(struct device * dev)685 static struct wmi_block *dev_to_wblock(struct device *dev)
686 {
687 return container_of(dev, struct wmi_block, dev.dev);
688 }
689
dev_to_wdev(struct device * dev)690 static struct wmi_device *dev_to_wdev(struct device *dev)
691 {
692 return container_of(dev, struct wmi_device, dev);
693 }
694
drv_to_wdrv(struct device_driver * drv)695 static inline struct wmi_driver *drv_to_wdrv(struct device_driver *drv)
696 {
697 return container_of(drv, struct wmi_driver, driver);
698 }
699
700 /*
701 * sysfs interface
702 */
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)703 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
704 char *buf)
705 {
706 struct wmi_block *wblock = dev_to_wblock(dev);
707
708 return sprintf(buf, "wmi:%pUL\n", &wblock->gblock.guid);
709 }
710 static DEVICE_ATTR_RO(modalias);
711
guid_show(struct device * dev,struct device_attribute * attr,char * buf)712 static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
713 char *buf)
714 {
715 struct wmi_block *wblock = dev_to_wblock(dev);
716
717 return sprintf(buf, "%pUL\n", &wblock->gblock.guid);
718 }
719 static DEVICE_ATTR_RO(guid);
720
instance_count_show(struct device * dev,struct device_attribute * attr,char * buf)721 static ssize_t instance_count_show(struct device *dev,
722 struct device_attribute *attr, char *buf)
723 {
724 struct wmi_block *wblock = dev_to_wblock(dev);
725
726 return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count);
727 }
728 static DEVICE_ATTR_RO(instance_count);
729
expensive_show(struct device * dev,struct device_attribute * attr,char * buf)730 static ssize_t expensive_show(struct device *dev,
731 struct device_attribute *attr, char *buf)
732 {
733 struct wmi_block *wblock = dev_to_wblock(dev);
734
735 return sprintf(buf, "%d\n",
736 (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0);
737 }
738 static DEVICE_ATTR_RO(expensive);
739
740 static struct attribute *wmi_attrs[] = {
741 &dev_attr_modalias.attr,
742 &dev_attr_guid.attr,
743 &dev_attr_instance_count.attr,
744 &dev_attr_expensive.attr,
745 NULL,
746 };
747 ATTRIBUTE_GROUPS(wmi);
748
notify_id_show(struct device * dev,struct device_attribute * attr,char * buf)749 static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr,
750 char *buf)
751 {
752 struct wmi_block *wblock = dev_to_wblock(dev);
753
754 return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id);
755 }
756 static DEVICE_ATTR_RO(notify_id);
757
758 static struct attribute *wmi_event_attrs[] = {
759 &dev_attr_notify_id.attr,
760 NULL,
761 };
762 ATTRIBUTE_GROUPS(wmi_event);
763
object_id_show(struct device * dev,struct device_attribute * attr,char * buf)764 static ssize_t object_id_show(struct device *dev, struct device_attribute *attr,
765 char *buf)
766 {
767 struct wmi_block *wblock = dev_to_wblock(dev);
768
769 return sprintf(buf, "%c%c\n", wblock->gblock.object_id[0],
770 wblock->gblock.object_id[1]);
771 }
772 static DEVICE_ATTR_RO(object_id);
773
setable_show(struct device * dev,struct device_attribute * attr,char * buf)774 static ssize_t setable_show(struct device *dev, struct device_attribute *attr,
775 char *buf)
776 {
777 struct wmi_device *wdev = dev_to_wdev(dev);
778
779 return sprintf(buf, "%d\n", (int)wdev->setable);
780 }
781 static DEVICE_ATTR_RO(setable);
782
783 static struct attribute *wmi_data_attrs[] = {
784 &dev_attr_object_id.attr,
785 &dev_attr_setable.attr,
786 NULL,
787 };
788 ATTRIBUTE_GROUPS(wmi_data);
789
790 static struct attribute *wmi_method_attrs[] = {
791 &dev_attr_object_id.attr,
792 NULL,
793 };
794 ATTRIBUTE_GROUPS(wmi_method);
795
wmi_dev_uevent(struct device * dev,struct kobj_uevent_env * env)796 static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
797 {
798 struct wmi_block *wblock = dev_to_wblock(dev);
799
800 if (add_uevent_var(env, "MODALIAS=wmi:%pUL", &wblock->gblock.guid))
801 return -ENOMEM;
802
803 if (add_uevent_var(env, "WMI_GUID=%pUL", &wblock->gblock.guid))
804 return -ENOMEM;
805
806 return 0;
807 }
808
wmi_dev_release(struct device * dev)809 static void wmi_dev_release(struct device *dev)
810 {
811 struct wmi_block *wblock = dev_to_wblock(dev);
812
813 kfree(wblock);
814 }
815
wmi_dev_match(struct device * dev,struct device_driver * driver)816 static int wmi_dev_match(struct device *dev, struct device_driver *driver)
817 {
818 struct wmi_driver *wmi_driver = drv_to_wdrv(driver);
819 struct wmi_block *wblock = dev_to_wblock(dev);
820 const struct wmi_device_id *id = wmi_driver->id_table;
821
822 if (id == NULL)
823 return 0;
824
825 while (*id->guid_string) {
826 if (guid_parse_and_compare(id->guid_string, &wblock->gblock.guid))
827 return 1;
828
829 id++;
830 }
831
832 return 0;
833 }
wmi_char_open(struct inode * inode,struct file * filp)834 static int wmi_char_open(struct inode *inode, struct file *filp)
835 {
836 /*
837 * The miscdevice already stores a pointer to itself
838 * inside filp->private_data
839 */
840 struct wmi_block *wblock = container_of(filp->private_data, struct wmi_block, char_dev);
841
842 filp->private_data = wblock;
843
844 return nonseekable_open(inode, filp);
845 }
846
wmi_char_read(struct file * filp,char __user * buffer,size_t length,loff_t * offset)847 static ssize_t wmi_char_read(struct file *filp, char __user *buffer,
848 size_t length, loff_t *offset)
849 {
850 struct wmi_block *wblock = filp->private_data;
851
852 return simple_read_from_buffer(buffer, length, offset,
853 &wblock->req_buf_size,
854 sizeof(wblock->req_buf_size));
855 }
856
wmi_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)857 static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
858 {
859 struct wmi_ioctl_buffer __user *input =
860 (struct wmi_ioctl_buffer __user *) arg;
861 struct wmi_block *wblock = filp->private_data;
862 struct wmi_ioctl_buffer *buf;
863 struct wmi_driver *wdriver;
864 int ret;
865
866 if (_IOC_TYPE(cmd) != WMI_IOC)
867 return -ENOTTY;
868
869 /* make sure we're not calling a higher instance than exists*/
870 if (_IOC_NR(cmd) >= wblock->gblock.instance_count)
871 return -EINVAL;
872
873 mutex_lock(&wblock->char_mutex);
874 buf = wblock->handler_data;
875 if (get_user(buf->length, &input->length)) {
876 dev_dbg(&wblock->dev.dev, "Read length from user failed\n");
877 ret = -EFAULT;
878 goto out_ioctl;
879 }
880 /* if it's too small, abort */
881 if (buf->length < wblock->req_buf_size) {
882 dev_err(&wblock->dev.dev,
883 "Buffer %lld too small, need at least %lld\n",
884 buf->length, wblock->req_buf_size);
885 ret = -EINVAL;
886 goto out_ioctl;
887 }
888 /* if it's too big, warn, driver will only use what is needed */
889 if (buf->length > wblock->req_buf_size)
890 dev_warn(&wblock->dev.dev,
891 "Buffer %lld is bigger than required %lld\n",
892 buf->length, wblock->req_buf_size);
893
894 /* copy the structure from userspace */
895 if (copy_from_user(buf, input, wblock->req_buf_size)) {
896 dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n",
897 wblock->req_buf_size);
898 ret = -EFAULT;
899 goto out_ioctl;
900 }
901
902 /* let the driver do any filtering and do the call */
903 wdriver = drv_to_wdrv(wblock->dev.dev.driver);
904 if (!try_module_get(wdriver->driver.owner)) {
905 ret = -EBUSY;
906 goto out_ioctl;
907 }
908 ret = wdriver->filter_callback(&wblock->dev, cmd, buf);
909 module_put(wdriver->driver.owner);
910 if (ret)
911 goto out_ioctl;
912
913 /* return the result (only up to our internal buffer size) */
914 if (copy_to_user(input, buf, wblock->req_buf_size)) {
915 dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n",
916 wblock->req_buf_size);
917 ret = -EFAULT;
918 }
919
920 out_ioctl:
921 mutex_unlock(&wblock->char_mutex);
922 return ret;
923 }
924
925 static const struct file_operations wmi_fops = {
926 .owner = THIS_MODULE,
927 .read = wmi_char_read,
928 .open = wmi_char_open,
929 .unlocked_ioctl = wmi_ioctl,
930 .compat_ioctl = compat_ptr_ioctl,
931 };
932
wmi_dev_probe(struct device * dev)933 static int wmi_dev_probe(struct device *dev)
934 {
935 struct wmi_block *wblock = dev_to_wblock(dev);
936 struct wmi_driver *wdriver = drv_to_wdrv(dev->driver);
937 int ret = 0;
938 char *buf;
939
940 if (ACPI_FAILURE(wmi_method_enable(wblock, 1)))
941 dev_warn(dev, "failed to enable device -- probing anyway\n");
942
943 if (wdriver->probe) {
944 ret = wdriver->probe(dev_to_wdev(dev),
945 find_guid_context(wblock, wdriver));
946 if (ret != 0)
947 goto probe_failure;
948 }
949
950 /* driver wants a character device made */
951 if (wdriver->filter_callback) {
952 /* check that required buffer size declared by driver or MOF */
953 if (!wblock->req_buf_size) {
954 dev_err(&wblock->dev.dev,
955 "Required buffer size not set\n");
956 ret = -EINVAL;
957 goto probe_failure;
958 }
959
960 wblock->handler_data = kmalloc(wblock->req_buf_size,
961 GFP_KERNEL);
962 if (!wblock->handler_data) {
963 ret = -ENOMEM;
964 goto probe_failure;
965 }
966
967 buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name);
968 if (!buf) {
969 ret = -ENOMEM;
970 goto probe_string_failure;
971 }
972 wblock->char_dev.minor = MISC_DYNAMIC_MINOR;
973 wblock->char_dev.name = buf;
974 wblock->char_dev.fops = &wmi_fops;
975 wblock->char_dev.mode = 0444;
976 ret = misc_register(&wblock->char_dev);
977 if (ret) {
978 dev_warn(dev, "failed to register char dev: %d\n", ret);
979 ret = -ENOMEM;
980 goto probe_misc_failure;
981 }
982 }
983
984 set_bit(WMI_PROBED, &wblock->flags);
985 return 0;
986
987 probe_misc_failure:
988 kfree(buf);
989 probe_string_failure:
990 kfree(wblock->handler_data);
991 probe_failure:
992 if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
993 dev_warn(dev, "failed to disable device\n");
994 return ret;
995 }
996
wmi_dev_remove(struct device * dev)997 static void wmi_dev_remove(struct device *dev)
998 {
999 struct wmi_block *wblock = dev_to_wblock(dev);
1000 struct wmi_driver *wdriver = drv_to_wdrv(dev->driver);
1001
1002 clear_bit(WMI_PROBED, &wblock->flags);
1003
1004 if (wdriver->filter_callback) {
1005 misc_deregister(&wblock->char_dev);
1006 kfree(wblock->char_dev.name);
1007 kfree(wblock->handler_data);
1008 }
1009
1010 if (wdriver->remove)
1011 wdriver->remove(dev_to_wdev(dev));
1012
1013 if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
1014 dev_warn(dev, "failed to disable device\n");
1015 }
1016
1017 static struct class wmi_bus_class = {
1018 .name = "wmi_bus",
1019 };
1020
1021 static struct bus_type wmi_bus_type = {
1022 .name = "wmi",
1023 .dev_groups = wmi_groups,
1024 .match = wmi_dev_match,
1025 .uevent = wmi_dev_uevent,
1026 .probe = wmi_dev_probe,
1027 .remove = wmi_dev_remove,
1028 };
1029
1030 static const struct device_type wmi_type_event = {
1031 .name = "event",
1032 .groups = wmi_event_groups,
1033 .release = wmi_dev_release,
1034 };
1035
1036 static const struct device_type wmi_type_method = {
1037 .name = "method",
1038 .groups = wmi_method_groups,
1039 .release = wmi_dev_release,
1040 };
1041
1042 static const struct device_type wmi_type_data = {
1043 .name = "data",
1044 .groups = wmi_data_groups,
1045 .release = wmi_dev_release,
1046 };
1047
1048 /*
1049 * _WDG is a static list that is only parsed at startup,
1050 * so it's safe to count entries without extra protection.
1051 */
guid_count(const guid_t * guid)1052 static int guid_count(const guid_t *guid)
1053 {
1054 struct wmi_block *wblock;
1055 int count = 0;
1056
1057 list_for_each_entry(wblock, &wmi_block_list, list) {
1058 if (guid_equal(&wblock->gblock.guid, guid))
1059 count++;
1060 }
1061
1062 return count;
1063 }
1064
wmi_create_device(struct device * wmi_bus_dev,struct wmi_block * wblock,struct acpi_device * device)1065 static int wmi_create_device(struct device *wmi_bus_dev,
1066 struct wmi_block *wblock,
1067 struct acpi_device *device)
1068 {
1069 struct acpi_device_info *info;
1070 char method[5];
1071 int result;
1072 uint count;
1073
1074 if (wblock->gblock.flags & ACPI_WMI_EVENT) {
1075 wblock->dev.dev.type = &wmi_type_event;
1076 goto out_init;
1077 }
1078
1079 if (wblock->gblock.flags & ACPI_WMI_METHOD) {
1080 wblock->dev.dev.type = &wmi_type_method;
1081 mutex_init(&wblock->char_mutex);
1082 goto out_init;
1083 }
1084
1085 /*
1086 * Data Block Query Control Method (WQxx by convention) is
1087 * required per the WMI documentation. If it is not present,
1088 * we ignore this data block.
1089 */
1090 strcpy(method, "WQ");
1091 strncat(method, wblock->gblock.object_id, 2);
1092 result = get_subobj_info(device->handle, method, &info);
1093
1094 if (result) {
1095 dev_warn(wmi_bus_dev,
1096 "%s data block query control method not found\n",
1097 method);
1098 return result;
1099 }
1100
1101 wblock->dev.dev.type = &wmi_type_data;
1102
1103 /*
1104 * The Microsoft documentation specifically states:
1105 *
1106 * Data blocks registered with only a single instance
1107 * can ignore the parameter.
1108 *
1109 * ACPICA will get mad at us if we call the method with the wrong number
1110 * of arguments, so check what our method expects. (On some Dell
1111 * laptops, WQxx may not be a method at all.)
1112 */
1113 if (info->type != ACPI_TYPE_METHOD || info->param_count == 0)
1114 set_bit(WMI_READ_TAKES_NO_ARGS, &wblock->flags);
1115
1116 kfree(info);
1117
1118 strcpy(method, "WS");
1119 strncat(method, wblock->gblock.object_id, 2);
1120 result = get_subobj_info(device->handle, method, NULL);
1121
1122 if (result == 0)
1123 wblock->dev.setable = true;
1124
1125 out_init:
1126 wblock->dev.dev.bus = &wmi_bus_type;
1127 wblock->dev.dev.parent = wmi_bus_dev;
1128
1129 count = guid_count(&wblock->gblock.guid);
1130 if (count)
1131 dev_set_name(&wblock->dev.dev, "%pUL-%d", &wblock->gblock.guid, count);
1132 else
1133 dev_set_name(&wblock->dev.dev, "%pUL", &wblock->gblock.guid);
1134
1135 device_initialize(&wblock->dev.dev);
1136
1137 return 0;
1138 }
1139
wmi_free_devices(struct acpi_device * device)1140 static void wmi_free_devices(struct acpi_device *device)
1141 {
1142 struct wmi_block *wblock, *next;
1143
1144 /* Delete devices for all the GUIDs */
1145 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
1146 if (wblock->acpi_device == device) {
1147 list_del(&wblock->list);
1148 device_unregister(&wblock->dev.dev);
1149 }
1150 }
1151 }
1152
guid_already_parsed_for_legacy(struct acpi_device * device,const guid_t * guid)1153 static bool guid_already_parsed_for_legacy(struct acpi_device *device, const guid_t *guid)
1154 {
1155 struct wmi_block *wblock;
1156
1157 list_for_each_entry(wblock, &wmi_block_list, list) {
1158 int i;
1159
1160 /* skip warning and register if we know the driver will use struct wmi_driver */
1161 for (i = 0; allow_duplicates[i] != NULL; i++) {
1162 guid_t tmp;
1163
1164 if (guid_parse(allow_duplicates[i], &tmp))
1165 continue;
1166 if (guid_equal(&tmp, guid))
1167 return false;
1168 }
1169 if (guid_equal(&wblock->gblock.guid, guid)) {
1170 /*
1171 * Because we historically didn't track the relationship
1172 * between GUIDs and ACPI nodes, we don't know whether
1173 * we need to suppress GUIDs that are unique on a
1174 * given node but duplicated across nodes.
1175 */
1176 dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n",
1177 guid, dev_name(&wblock->acpi_device->dev));
1178 return true;
1179 }
1180 }
1181
1182 return false;
1183 }
1184
1185 /*
1186 * Parse the _WDG method for the GUID data blocks
1187 */
parse_wdg(struct device * wmi_bus_dev,struct acpi_device * device)1188 static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
1189 {
1190 struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
1191 const struct guid_block *gblock;
1192 struct wmi_block *wblock, *next;
1193 union acpi_object *obj;
1194 acpi_status status;
1195 u32 i, total;
1196 int retval;
1197
1198 status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out);
1199 if (ACPI_FAILURE(status))
1200 return -ENXIO;
1201
1202 obj = (union acpi_object *) out.pointer;
1203 if (!obj)
1204 return -ENXIO;
1205
1206 if (obj->type != ACPI_TYPE_BUFFER) {
1207 kfree(obj);
1208 return -ENXIO;
1209 }
1210
1211 gblock = (const struct guid_block *)obj->buffer.pointer;
1212 total = obj->buffer.length / sizeof(struct guid_block);
1213
1214 for (i = 0; i < total; i++) {
1215 if (debug_dump_wdg)
1216 wmi_dump_wdg(&gblock[i]);
1217
1218 if (!gblock[i].instance_count) {
1219 dev_info(wmi_bus_dev, FW_INFO "%pUL has zero instances\n", &gblock[i].guid);
1220 continue;
1221 }
1222
1223 if (guid_already_parsed_for_legacy(device, &gblock[i].guid))
1224 continue;
1225
1226 wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
1227 if (!wblock) {
1228 dev_err(wmi_bus_dev, "Failed to allocate %pUL\n", &gblock[i].guid);
1229 continue;
1230 }
1231
1232 wblock->acpi_device = device;
1233 wblock->gblock = gblock[i];
1234
1235 retval = wmi_create_device(wmi_bus_dev, wblock, device);
1236 if (retval) {
1237 kfree(wblock);
1238 continue;
1239 }
1240
1241 list_add_tail(&wblock->list, &wmi_block_list);
1242
1243 if (debug_event) {
1244 wblock->handler = wmi_notify_debug;
1245 wmi_method_enable(wblock, 1);
1246 }
1247 }
1248
1249 /*
1250 * Now that all of the devices are created, add them to the
1251 * device tree and probe subdrivers.
1252 */
1253 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
1254 if (wblock->acpi_device != device)
1255 continue;
1256
1257 retval = device_add(&wblock->dev.dev);
1258 if (retval) {
1259 dev_err(wmi_bus_dev, "failed to register %pUL\n",
1260 &wblock->gblock.guid);
1261 if (debug_event)
1262 wmi_method_enable(wblock, 0);
1263 list_del(&wblock->list);
1264 put_device(&wblock->dev.dev);
1265 }
1266 }
1267
1268 kfree(obj);
1269
1270 return 0;
1271 }
1272
1273 /*
1274 * WMI can have EmbeddedControl access regions. In which case, we just want to
1275 * hand these off to the EC driver.
1276 */
1277 static acpi_status
acpi_wmi_ec_space_handler(u32 function,acpi_physical_address address,u32 bits,u64 * value,void * handler_context,void * region_context)1278 acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
1279 u32 bits, u64 *value,
1280 void *handler_context, void *region_context)
1281 {
1282 int result = 0, i = 0;
1283 u8 temp = 0;
1284
1285 if ((address > 0xFF) || !value)
1286 return AE_BAD_PARAMETER;
1287
1288 if (function != ACPI_READ && function != ACPI_WRITE)
1289 return AE_BAD_PARAMETER;
1290
1291 if (bits != 8)
1292 return AE_BAD_PARAMETER;
1293
1294 if (function == ACPI_READ) {
1295 result = ec_read(address, &temp);
1296 (*value) |= ((u64)temp) << i;
1297 } else {
1298 temp = 0xff & ((*value) >> i);
1299 result = ec_write(address, temp);
1300 }
1301
1302 switch (result) {
1303 case -EINVAL:
1304 return AE_BAD_PARAMETER;
1305 case -ENODEV:
1306 return AE_NOT_FOUND;
1307 case -ETIME:
1308 return AE_TIME;
1309 default:
1310 return AE_OK;
1311 }
1312 }
1313
acpi_wmi_notify_handler(acpi_handle handle,u32 event,void * context)1314 static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
1315 void *context)
1316 {
1317 struct wmi_block *wblock;
1318 bool found_it = false;
1319
1320 list_for_each_entry(wblock, &wmi_block_list, list) {
1321 struct guid_block *block = &wblock->gblock;
1322
1323 if (wblock->acpi_device->handle == handle &&
1324 (block->flags & ACPI_WMI_EVENT) &&
1325 (block->notify_id == event))
1326 {
1327 found_it = true;
1328 break;
1329 }
1330 }
1331
1332 if (!found_it)
1333 return;
1334
1335 /* If a driver is bound, then notify the driver. */
1336 if (test_bit(WMI_PROBED, &wblock->flags) && wblock->dev.dev.driver) {
1337 struct wmi_driver *driver = drv_to_wdrv(wblock->dev.dev.driver);
1338 struct acpi_object_list input;
1339 union acpi_object params[1];
1340 struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL };
1341 acpi_status status;
1342
1343 input.count = 1;
1344 input.pointer = params;
1345 params[0].type = ACPI_TYPE_INTEGER;
1346 params[0].integer.value = event;
1347
1348 status = acpi_evaluate_object(wblock->acpi_device->handle,
1349 "_WED", &input, &evdata);
1350 if (ACPI_FAILURE(status)) {
1351 dev_warn(&wblock->dev.dev,
1352 "failed to get event data\n");
1353 return;
1354 }
1355
1356 if (driver->notify)
1357 driver->notify(&wblock->dev,
1358 (union acpi_object *)evdata.pointer);
1359
1360 kfree(evdata.pointer);
1361 } else if (wblock->handler) {
1362 /* Legacy handler */
1363 wblock->handler(event, wblock->handler_data);
1364 }
1365
1366 if (debug_event)
1367 pr_info("DEBUG Event GUID: %pUL\n", &wblock->gblock.guid);
1368
1369 acpi_bus_generate_netlink_event(
1370 wblock->acpi_device->pnp.device_class,
1371 dev_name(&wblock->dev.dev),
1372 event, 0);
1373
1374 }
1375
acpi_wmi_remove(struct platform_device * device)1376 static int acpi_wmi_remove(struct platform_device *device)
1377 {
1378 struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
1379
1380 acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
1381 acpi_wmi_notify_handler);
1382 acpi_remove_address_space_handler(acpi_device->handle,
1383 ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
1384 wmi_free_devices(acpi_device);
1385 device_unregister((struct device *)dev_get_drvdata(&device->dev));
1386
1387 return 0;
1388 }
1389
acpi_wmi_probe(struct platform_device * device)1390 static int acpi_wmi_probe(struct platform_device *device)
1391 {
1392 struct acpi_device *acpi_device;
1393 struct device *wmi_bus_dev;
1394 acpi_status status;
1395 int error;
1396
1397 acpi_device = ACPI_COMPANION(&device->dev);
1398 if (!acpi_device) {
1399 dev_err(&device->dev, "ACPI companion is missing\n");
1400 return -ENODEV;
1401 }
1402
1403 status = acpi_install_address_space_handler(acpi_device->handle,
1404 ACPI_ADR_SPACE_EC,
1405 &acpi_wmi_ec_space_handler,
1406 NULL, NULL);
1407 if (ACPI_FAILURE(status)) {
1408 dev_err(&device->dev, "Error installing EC region handler\n");
1409 return -ENODEV;
1410 }
1411
1412 status = acpi_install_notify_handler(acpi_device->handle,
1413 ACPI_DEVICE_NOTIFY,
1414 acpi_wmi_notify_handler,
1415 NULL);
1416 if (ACPI_FAILURE(status)) {
1417 dev_err(&device->dev, "Error installing notify handler\n");
1418 error = -ENODEV;
1419 goto err_remove_ec_handler;
1420 }
1421
1422 wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0),
1423 NULL, "wmi_bus-%s", dev_name(&device->dev));
1424 if (IS_ERR(wmi_bus_dev)) {
1425 error = PTR_ERR(wmi_bus_dev);
1426 goto err_remove_notify_handler;
1427 }
1428 dev_set_drvdata(&device->dev, wmi_bus_dev);
1429
1430 error = parse_wdg(wmi_bus_dev, acpi_device);
1431 if (error) {
1432 pr_err("Failed to parse WDG method\n");
1433 goto err_remove_busdev;
1434 }
1435
1436 return 0;
1437
1438 err_remove_busdev:
1439 device_unregister(wmi_bus_dev);
1440
1441 err_remove_notify_handler:
1442 acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
1443 acpi_wmi_notify_handler);
1444
1445 err_remove_ec_handler:
1446 acpi_remove_address_space_handler(acpi_device->handle,
1447 ACPI_ADR_SPACE_EC,
1448 &acpi_wmi_ec_space_handler);
1449
1450 return error;
1451 }
1452
__wmi_driver_register(struct wmi_driver * driver,struct module * owner)1453 int __must_check __wmi_driver_register(struct wmi_driver *driver,
1454 struct module *owner)
1455 {
1456 driver->driver.owner = owner;
1457 driver->driver.bus = &wmi_bus_type;
1458
1459 return driver_register(&driver->driver);
1460 }
1461 EXPORT_SYMBOL(__wmi_driver_register);
1462
wmi_driver_unregister(struct wmi_driver * driver)1463 void wmi_driver_unregister(struct wmi_driver *driver)
1464 {
1465 driver_unregister(&driver->driver);
1466 }
1467 EXPORT_SYMBOL(wmi_driver_unregister);
1468
acpi_wmi_init(void)1469 static int __init acpi_wmi_init(void)
1470 {
1471 int error;
1472
1473 if (acpi_disabled)
1474 return -ENODEV;
1475
1476 error = class_register(&wmi_bus_class);
1477 if (error)
1478 return error;
1479
1480 error = bus_register(&wmi_bus_type);
1481 if (error)
1482 goto err_unreg_class;
1483
1484 error = platform_driver_register(&acpi_wmi_driver);
1485 if (error) {
1486 pr_err("Error loading mapper\n");
1487 goto err_unreg_bus;
1488 }
1489
1490 return 0;
1491
1492 err_unreg_bus:
1493 bus_unregister(&wmi_bus_type);
1494
1495 err_unreg_class:
1496 class_unregister(&wmi_bus_class);
1497
1498 return error;
1499 }
1500
acpi_wmi_exit(void)1501 static void __exit acpi_wmi_exit(void)
1502 {
1503 platform_driver_unregister(&acpi_wmi_driver);
1504 bus_unregister(&wmi_bus_type);
1505 class_unregister(&wmi_bus_class);
1506 }
1507
1508 subsys_initcall_sync(acpi_wmi_init);
1509 module_exit(acpi_wmi_exit);
1510