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Linux 4.19.133
[linux/fpc-iii.git] / drivers / platform / x86 / wmi.c
blob35cdc3998eb5914d6841abda625e0371d9f79a15
1 /*
2 * ACPI-WMI mapping driver
3 *
4 * Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
5 *
6 * GUID parsing code from ldm.c is:
7 * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
8 * Copyright (c) 2001-2007 Anton Altaparmakov
9 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
10 *
11 * WMI bus infrastructure by Andrew Lutomirski and Darren Hart:
12 * Copyright (C) 2015 Andrew Lutomirski
13 * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
14 *
15 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or (at
20 * your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License along
28 * with this program; if not, write to the Free Software Foundation, Inc.,
29 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
30 *
31 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
32 */
33
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36 #include <linux/acpi.h>
37 #include <linux/device.h>
38 #include <linux/init.h>
39 #include <linux/kernel.h>
40 #include <linux/list.h>
41 #include <linux/miscdevice.h>
42 #include <linux/module.h>
43 #include <linux/platform_device.h>
44 #include <linux/slab.h>
45 #include <linux/types.h>
46 #include <linux/uaccess.h>
47 #include <linux/uuid.h>
48 #include <linux/wmi.h>
49 #include <uapi/linux/wmi.h>
50
51 ACPI_MODULE_NAME("wmi");
52 MODULE_AUTHOR("Carlos Corbacho");
53 MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
54 MODULE_LICENSE("GPL");
55
56 static LIST_HEAD(wmi_block_list);
57
58 struct guid_block {
59 char guid[16];
60 union {
61 char object_id[2];
62 struct {
63 unsigned char notify_id;
64 unsigned char reserved;
65 };
66 };
67 u8 instance_count;
68 u8 flags;
69 };
70
71 struct wmi_block {
72 struct wmi_device dev;
73 struct list_head list;
74 struct guid_block gblock;
75 struct miscdevice char_dev;
76 struct mutex char_mutex;
77 struct acpi_device *acpi_device;
78 wmi_notify_handler handler;
79 void *handler_data;
80 u64 req_buf_size;
81
82 bool read_takes_no_args;
83 };
84
85
86 /*
87 * If the GUID data block is marked as expensive, we must enable and
88 * explicitily disable data collection.
89 */
90 #define ACPI_WMI_EXPENSIVE 0x1
91 #define ACPI_WMI_METHOD 0x2 /* GUID is a method */
92 #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
93 #define ACPI_WMI_EVENT 0x8 /* GUID is an event */
94
95 static bool debug_event;
96 module_param(debug_event, bool, 0444);
97 MODULE_PARM_DESC(debug_event,
98 "Log WMI Events [0/1]");
99
100 static bool debug_dump_wdg;
101 module_param(debug_dump_wdg, bool, 0444);
102 MODULE_PARM_DESC(debug_dump_wdg,
103 "Dump available WMI interfaces [0/1]");
104
105 static int acpi_wmi_remove(struct platform_device *device);
106 static int acpi_wmi_probe(struct platform_device *device);
107
108 static const struct acpi_device_id wmi_device_ids[] = {
109 {"PNP0C14", 0},
110 {"pnp0c14", 0},
111 {"", 0},
112 };
113 MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
114
115 static struct platform_driver acpi_wmi_driver = {
116 .driver = {
117 .name = "acpi-wmi",
118 .acpi_match_table = wmi_device_ids,
119 },
120 .probe = acpi_wmi_probe,
121 .remove = acpi_wmi_remove,
122 };
123
124 /*
125 * GUID parsing functions
126 */
127
128 static bool find_guid(const char *guid_string, struct wmi_block **out)
129 {
130 uuid_le guid_input;
131 struct wmi_block *wblock;
132 struct guid_block *block;
133
134 if (uuid_le_to_bin(guid_string, &guid_input))
135 return false;
136
137 list_for_each_entry(wblock, &wmi_block_list, list) {
138 block = &wblock->gblock;
139
140 if (memcmp(block->guid, &guid_input, 16) == 0) {
141 if (out)
142 *out = wblock;
143 return true;
144 }
145 }
146 return false;
147 }
148
149 static int get_subobj_info(acpi_handle handle, const char *pathname,
150 struct acpi_device_info **info)
151 {
152 struct acpi_device_info *dummy_info, **info_ptr;
153 acpi_handle subobj_handle;
154 acpi_status status;
155
156 status = acpi_get_handle(handle, (char *)pathname, &subobj_handle);
157 if (status == AE_NOT_FOUND)
158 return -ENOENT;
159 else if (ACPI_FAILURE(status))
160 return -EIO;
161
162 info_ptr = info ? info : &dummy_info;
163 status = acpi_get_object_info(subobj_handle, info_ptr);
164 if (ACPI_FAILURE(status))
165 return -EIO;
166
167 if (!info)
168 kfree(dummy_info);
169
170 return 0;
171 }
172
173 static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
174 {
175 struct guid_block *block = NULL;
176 char method[5];
177 acpi_status status;
178 acpi_handle handle;
179
180 block = &wblock->gblock;
181 handle = wblock->acpi_device->handle;
182
183 snprintf(method, 5, "WE%02X", block->notify_id);
184 status = acpi_execute_simple_method(handle, method, enable);
185
186 if (status != AE_OK && status != AE_NOT_FOUND)
187 return status;
188 else
189 return AE_OK;
190 }
191
192 /*
193 * Exported WMI functions
194 */
195
196 /**
197 * set_required_buffer_size - Sets the buffer size needed for performing IOCTL
198 * @wdev: A wmi bus device from a driver
199 * @instance: Instance index
200 *
201 * Allocates memory needed for buffer, stores the buffer size in that memory
202 */
203 int set_required_buffer_size(struct wmi_device *wdev, u64 length)
204 {
205 struct wmi_block *wblock;
206
207 wblock = container_of(wdev, struct wmi_block, dev);
208 wblock->req_buf_size = length;
209
210 return 0;
211 }
212 EXPORT_SYMBOL_GPL(set_required_buffer_size);
213
214 /**
215 * wmi_evaluate_method - Evaluate a WMI method
216 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
217 * @instance: Instance index
218 * @method_id: Method ID to call
219 * &in: Buffer containing input for the method call
220 * &out: Empty buffer to return the method results
221 *
222 * Call an ACPI-WMI method
223 */
224 acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
225 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
226 {
227 struct wmi_block *wblock = NULL;
228
229 if (!find_guid(guid_string, &wblock))
230 return AE_ERROR;
231 return wmidev_evaluate_method(&wblock->dev, instance, method_id,
232 in, out);
233 }
234 EXPORT_SYMBOL_GPL(wmi_evaluate_method);
235
236 /**
237 * wmidev_evaluate_method - Evaluate a WMI method
238 * @wdev: A wmi bus device from a driver
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 */
246 acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
247 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
248 {
249 struct guid_block *block = NULL;
250 struct wmi_block *wblock = NULL;
251 acpi_handle handle;
252 acpi_status status;
253 struct acpi_object_list input;
254 union acpi_object params[3];
255 char method[5] = "WM";
256
257 wblock = container_of(wdev, struct wmi_block, dev);
258 block = &wblock->gblock;
259 handle = wblock->acpi_device->handle;
260
261 if (!(block->flags & ACPI_WMI_METHOD))
262 return AE_BAD_DATA;
263
264 if (block->instance_count <= instance)
265 return AE_BAD_PARAMETER;
266
267 input.count = 2;
268 input.pointer = params;
269 params[0].type = ACPI_TYPE_INTEGER;
270 params[0].integer.value = instance;
271 params[1].type = ACPI_TYPE_INTEGER;
272 params[1].integer.value = method_id;
273
274 if (in) {
275 input.count = 3;
276
277 if (block->flags & ACPI_WMI_STRING) {
278 params[2].type = ACPI_TYPE_STRING;
279 } else {
280 params[2].type = ACPI_TYPE_BUFFER;
281 }
282 params[2].buffer.length = in->length;
283 params[2].buffer.pointer = in->pointer;
284 }
285
286 strncat(method, block->object_id, 2);
287
288 status = acpi_evaluate_object(handle, method, &input, out);
289
290 return status;
291 }
292 EXPORT_SYMBOL_GPL(wmidev_evaluate_method);
293
294 static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
295 struct acpi_buffer *out)
296 {
297 struct guid_block *block = NULL;
298 acpi_handle handle;
299 acpi_status status, wc_status = AE_ERROR;
300 struct acpi_object_list input;
301 union acpi_object wq_params[1];
302 char method[5];
303 char wc_method[5] = "WC";
304
305 if (!out)
306 return AE_BAD_PARAMETER;
307
308 block = &wblock->gblock;
309 handle = wblock->acpi_device->handle;
310
311 if (block->instance_count <= instance)
312 return AE_BAD_PARAMETER;
313
314 /* Check GUID is a data block */
315 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
316 return AE_ERROR;
317
318 input.count = 1;
319 input.pointer = wq_params;
320 wq_params[0].type = ACPI_TYPE_INTEGER;
321 wq_params[0].integer.value = instance;
322
323 if (instance == 0 && wblock->read_takes_no_args)
324 input.count = 0;
325
326 /*
327 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
328 * enable collection.
329 */
330 if (block->flags & ACPI_WMI_EXPENSIVE) {
331 strncat(wc_method, block->object_id, 2);
332
333 /*
334 * Some GUIDs break the specification by declaring themselves
335 * expensive, but have no corresponding WCxx method. So we
336 * should not fail if this happens.
337 */
338 if (acpi_has_method(handle, wc_method))
339 wc_status = acpi_execute_simple_method(handle,
340 wc_method, 1);
341 }
342
343 strcpy(method, "WQ");
344 strncat(method, block->object_id, 2);
345
346 status = acpi_evaluate_object(handle, method, &input, out);
347
348 /*
349 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
350 * the WQxx method failed - we should disable collection anyway.
351 */
352 if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
353 status = acpi_execute_simple_method(handle, wc_method, 0);
354 }
355
356 return status;
357 }
358
359 /**
360 * wmi_query_block - Return contents of a WMI block (deprecated)
361 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
362 * @instance: Instance index
363 * &out: Empty buffer to return the contents of the data block to
364 *
365 * Return the contents of an ACPI-WMI data block to a buffer
366 */
367 acpi_status wmi_query_block(const char *guid_string, u8 instance,
368 struct acpi_buffer *out)
369 {
370 struct wmi_block *wblock;
371
372 if (!guid_string)
373 return AE_BAD_PARAMETER;
374
375 if (!find_guid(guid_string, &wblock))
376 return AE_ERROR;
377
378 return __query_block(wblock, instance, out);
379 }
380 EXPORT_SYMBOL_GPL(wmi_query_block);
381
382 union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
383 {
384 struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
385 struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev);
386
387 if (ACPI_FAILURE(__query_block(wblock, instance, &out)))
388 return NULL;
389
390 return (union acpi_object *)out.pointer;
391 }
392 EXPORT_SYMBOL_GPL(wmidev_block_query);
393
394 /**
395 * wmi_set_block - Write to a WMI block
396 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
397 * @instance: Instance index
398 * &in: Buffer containing new values for the data block
399 *
400 * Write the contents of the input buffer to an ACPI-WMI data block
401 */
402 acpi_status wmi_set_block(const char *guid_string, u8 instance,
403 const struct acpi_buffer *in)
404 {
405 struct guid_block *block = NULL;
406 struct wmi_block *wblock = NULL;
407 acpi_handle handle;
408 struct acpi_object_list input;
409 union acpi_object params[2];
410 char method[5] = "WS";
411
412 if (!guid_string || !in)
413 return AE_BAD_DATA;
414
415 if (!find_guid(guid_string, &wblock))
416 return AE_ERROR;
417
418 block = &wblock->gblock;
419 handle = wblock->acpi_device->handle;
420
421 if (block->instance_count <= instance)
422 return AE_BAD_PARAMETER;
423
424 /* Check GUID is a data block */
425 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
426 return AE_ERROR;
427
428 input.count = 2;
429 input.pointer = params;
430 params[0].type = ACPI_TYPE_INTEGER;
431 params[0].integer.value = instance;
432
433 if (block->flags & ACPI_WMI_STRING) {
434 params[1].type = ACPI_TYPE_STRING;
435 } else {
436 params[1].type = ACPI_TYPE_BUFFER;
437 }
438 params[1].buffer.length = in->length;
439 params[1].buffer.pointer = in->pointer;
440
441 strncat(method, block->object_id, 2);
442
443 return acpi_evaluate_object(handle, method, &input, NULL);
444 }
445 EXPORT_SYMBOL_GPL(wmi_set_block);
446
447 static void wmi_dump_wdg(const struct guid_block *g)
448 {
449 pr_info("%pUL:\n", g->guid);
450 if (g->flags & ACPI_WMI_EVENT)
451 pr_info("\tnotify_id: 0x%02X\n", g->notify_id);
452 else
453 pr_info("\tobject_id: %2pE\n", g->object_id);
454 pr_info("\tinstance_count: %d\n", g->instance_count);
455 pr_info("\tflags: %#x", g->flags);
456 if (g->flags) {
457 if (g->flags & ACPI_WMI_EXPENSIVE)
458 pr_cont(" ACPI_WMI_EXPENSIVE");
459 if (g->flags & ACPI_WMI_METHOD)
460 pr_cont(" ACPI_WMI_METHOD");
461 if (g->flags & ACPI_WMI_STRING)
462 pr_cont(" ACPI_WMI_STRING");
463 if (g->flags & ACPI_WMI_EVENT)
464 pr_cont(" ACPI_WMI_EVENT");
465 }
466 pr_cont("\n");
467
468 }
469
470 static void wmi_notify_debug(u32 value, void *context)
471 {
472 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
473 union acpi_object *obj;
474 acpi_status status;
475
476 status = wmi_get_event_data(value, &response);
477 if (status != AE_OK) {
478 pr_info("bad event status 0x%x\n", status);
479 return;
480 }
481
482 obj = (union acpi_object *)response.pointer;
483
484 if (!obj)
485 return;
486
487 pr_info("DEBUG Event ");
488 switch(obj->type) {
489 case ACPI_TYPE_BUFFER:
490 pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
491 break;
492 case ACPI_TYPE_STRING:
493 pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
494 break;
495 case ACPI_TYPE_INTEGER:
496 pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
497 break;
498 case ACPI_TYPE_PACKAGE:
499 pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
500 break;
501 default:
502 pr_cont("object type 0x%X\n", obj->type);
503 }
504 kfree(obj);
505 }
506
507 /**
508 * wmi_install_notify_handler - Register handler for WMI events
509 * @handler: Function to handle notifications
510 * @data: Data to be returned to handler when event is fired
511 *
512 * Register a handler for events sent to the ACPI-WMI mapper device.
513 */
514 acpi_status wmi_install_notify_handler(const char *guid,
515 wmi_notify_handler handler, void *data)
516 {
517 struct wmi_block *block;
518 acpi_status status = AE_NOT_EXIST;
519 uuid_le guid_input;
520
521 if (!guid || !handler)
522 return AE_BAD_PARAMETER;
523
524 if (uuid_le_to_bin(guid, &guid_input))
525 return AE_BAD_PARAMETER;
526
527 list_for_each_entry(block, &wmi_block_list, list) {
528 acpi_status wmi_status;
529
530 if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
531 if (block->handler &&
532 block->handler != wmi_notify_debug)
533 return AE_ALREADY_ACQUIRED;
534
535 block->handler = handler;
536 block->handler_data = data;
537
538 wmi_status = wmi_method_enable(block, 1);
539 if ((wmi_status != AE_OK) ||
540 ((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
541 status = wmi_status;
542 }
543 }
544
545 return status;
546 }
547 EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
548
549 /**
550 * wmi_uninstall_notify_handler - Unregister handler for WMI events
551 *
552 * Unregister handler for events sent to the ACPI-WMI mapper device.
553 */
554 acpi_status wmi_remove_notify_handler(const char *guid)
555 {
556 struct wmi_block *block;
557 acpi_status status = AE_NOT_EXIST;
558 uuid_le guid_input;
559
560 if (!guid)
561 return AE_BAD_PARAMETER;
562
563 if (uuid_le_to_bin(guid, &guid_input))
564 return AE_BAD_PARAMETER;
565
566 list_for_each_entry(block, &wmi_block_list, list) {
567 acpi_status wmi_status;
568
569 if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
570 if (!block->handler ||
571 block->handler == wmi_notify_debug)
572 return AE_NULL_ENTRY;
573
574 if (debug_event) {
575 block->handler = wmi_notify_debug;
576 status = AE_OK;
577 } else {
578 wmi_status = wmi_method_enable(block, 0);
579 block->handler = NULL;
580 block->handler_data = NULL;
581 if ((wmi_status != AE_OK) ||
582 ((wmi_status == AE_OK) &&
583 (status == AE_NOT_EXIST)))
584 status = wmi_status;
585 }
586 }
587 }
588
589 return status;
590 }
591 EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
592
593 /**
594 * wmi_get_event_data - Get WMI data associated with an event
595 *
596 * @event: Event to find
597 * @out: Buffer to hold event data. out->pointer should be freed with kfree()
598 *
599 * Returns extra data associated with an event in WMI.
600 */
601 acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
602 {
603 struct acpi_object_list input;
604 union acpi_object params[1];
605 struct guid_block *gblock;
606 struct wmi_block *wblock;
607
608 input.count = 1;
609 input.pointer = params;
610 params[0].type = ACPI_TYPE_INTEGER;
611 params[0].integer.value = event;
612
613 list_for_each_entry(wblock, &wmi_block_list, list) {
614 gblock = &wblock->gblock;
615
616 if ((gblock->flags & ACPI_WMI_EVENT) &&
617 (gblock->notify_id == event))
618 return acpi_evaluate_object(wblock->acpi_device->handle,
619 "_WED", &input, out);
620 }
621
622 return AE_NOT_FOUND;
623 }
624 EXPORT_SYMBOL_GPL(wmi_get_event_data);
625
626 /**
627 * wmi_has_guid - Check if a GUID is available
628 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
629 *
630 * Check if a given GUID is defined by _WDG
631 */
632 bool wmi_has_guid(const char *guid_string)
633 {
634 return find_guid(guid_string, NULL);
635 }
636 EXPORT_SYMBOL_GPL(wmi_has_guid);
637
638 static struct wmi_block *dev_to_wblock(struct device *dev)
639 {
640 return container_of(dev, struct wmi_block, dev.dev);
641 }
642
643 static struct wmi_device *dev_to_wdev(struct device *dev)
644 {
645 return container_of(dev, struct wmi_device, dev);
646 }
647
648 /*
649 * sysfs interface
650 */
651 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
652 char *buf)
653 {
654 struct wmi_block *wblock = dev_to_wblock(dev);
655
656 return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid);
657 }
658 static DEVICE_ATTR_RO(modalias);
659
660 static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
661 char *buf)
662 {
663 struct wmi_block *wblock = dev_to_wblock(dev);
664
665 return sprintf(buf, "%pUL\n", wblock->gblock.guid);
666 }
667 static DEVICE_ATTR_RO(guid);
668
669 static ssize_t instance_count_show(struct device *dev,
670 struct device_attribute *attr, char *buf)
671 {
672 struct wmi_block *wblock = dev_to_wblock(dev);
673
674 return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count);
675 }
676 static DEVICE_ATTR_RO(instance_count);
677
678 static ssize_t expensive_show(struct device *dev,
679 struct device_attribute *attr, char *buf)
680 {
681 struct wmi_block *wblock = dev_to_wblock(dev);
682
683 return sprintf(buf, "%d\n",
684 (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0);
685 }
686 static DEVICE_ATTR_RO(expensive);
687
688 static struct attribute *wmi_attrs[] = {
689 &dev_attr_modalias.attr,
690 &dev_attr_guid.attr,
691 &dev_attr_instance_count.attr,
692 &dev_attr_expensive.attr,
693 NULL,
694 };
695 ATTRIBUTE_GROUPS(wmi);
696
697 static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr,
698 char *buf)
699 {
700 struct wmi_block *wblock = dev_to_wblock(dev);
701
702 return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id);
703 }
704 static DEVICE_ATTR_RO(notify_id);
705
706 static struct attribute *wmi_event_attrs[] = {
707 &dev_attr_notify_id.attr,
708 NULL,
709 };
710 ATTRIBUTE_GROUPS(wmi_event);
711
712 static ssize_t object_id_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, "%c%c\n", wblock->gblock.object_id[0],
718 wblock->gblock.object_id[1]);
719 }
720 static DEVICE_ATTR_RO(object_id);
721
722 static ssize_t setable_show(struct device *dev, struct device_attribute *attr,
723 char *buf)
724 {
725 struct wmi_device *wdev = dev_to_wdev(dev);
726
727 return sprintf(buf, "%d\n", (int)wdev->setable);
728 }
729 static DEVICE_ATTR_RO(setable);
730
731 static struct attribute *wmi_data_attrs[] = {
732 &dev_attr_object_id.attr,
733 &dev_attr_setable.attr,
734 NULL,
735 };
736 ATTRIBUTE_GROUPS(wmi_data);
737
738 static struct attribute *wmi_method_attrs[] = {
739 &dev_attr_object_id.attr,
740 NULL,
741 };
742 ATTRIBUTE_GROUPS(wmi_method);
743
744 static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
745 {
746 struct wmi_block *wblock = dev_to_wblock(dev);
747
748 if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid))
749 return -ENOMEM;
750
751 if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid))
752 return -ENOMEM;
753
754 return 0;
755 }
756
757 static void wmi_dev_release(struct device *dev)
758 {
759 struct wmi_block *wblock = dev_to_wblock(dev);
760
761 kfree(wblock);
762 }
763
764 static int wmi_dev_match(struct device *dev, struct device_driver *driver)
765 {
766 struct wmi_driver *wmi_driver =
767 container_of(driver, struct wmi_driver, driver);
768 struct wmi_block *wblock = dev_to_wblock(dev);
769 const struct wmi_device_id *id = wmi_driver->id_table;
770
771 if (id == NULL)
772 return 0;
773
774 while (id->guid_string) {
775 uuid_le driver_guid;
776
777 if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid)))
778 continue;
779 if (!memcmp(&driver_guid, wblock->gblock.guid, 16))
780 return 1;
781
782 id++;
783 }
784
785 return 0;
786 }
787 static int wmi_char_open(struct inode *inode, struct file *filp)
788 {
789 const char *driver_name = filp->f_path.dentry->d_iname;
790 struct wmi_block *wblock = NULL;
791 struct wmi_block *next = NULL;
792
793 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
794 if (!wblock->dev.dev.driver)
795 continue;
796 if (strcmp(driver_name, wblock->dev.dev.driver->name) == 0) {
797 filp->private_data = wblock;
798 break;
799 }
800 }
801
802 if (!filp->private_data)
803 return -ENODEV;
804
805 return nonseekable_open(inode, filp);
806 }
807
808 static ssize_t wmi_char_read(struct file *filp, char __user *buffer,
809 size_t length, loff_t *offset)
810 {
811 struct wmi_block *wblock = filp->private_data;
812
813 return simple_read_from_buffer(buffer, length, offset,
814 &wblock->req_buf_size,
815 sizeof(wblock->req_buf_size));
816 }
817
818 static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
819 {
820 struct wmi_ioctl_buffer __user *input =
821 (struct wmi_ioctl_buffer __user *) arg;
822 struct wmi_block *wblock = filp->private_data;
823 struct wmi_ioctl_buffer *buf = NULL;
824 struct wmi_driver *wdriver = NULL;
825 int ret;
826
827 if (_IOC_TYPE(cmd) != WMI_IOC)
828 return -ENOTTY;
829
830 /* make sure we're not calling a higher instance than exists*/
831 if (_IOC_NR(cmd) >= wblock->gblock.instance_count)
832 return -EINVAL;
833
834 mutex_lock(&wblock->char_mutex);
835 buf = wblock->handler_data;
836 if (get_user(buf->length, &input->length)) {
837 dev_dbg(&wblock->dev.dev, "Read length from user failed\n");
838 ret = -EFAULT;
839 goto out_ioctl;
840 }
841 /* if it's too small, abort */
842 if (buf->length < wblock->req_buf_size) {
843 dev_err(&wblock->dev.dev,
844 "Buffer %lld too small, need at least %lld\n",
845 buf->length, wblock->req_buf_size);
846 ret = -EINVAL;
847 goto out_ioctl;
848 }
849 /* if it's too big, warn, driver will only use what is needed */
850 if (buf->length > wblock->req_buf_size)
851 dev_warn(&wblock->dev.dev,
852 "Buffer %lld is bigger than required %lld\n",
853 buf->length, wblock->req_buf_size);
854
855 /* copy the structure from userspace */
856 if (copy_from_user(buf, input, wblock->req_buf_size)) {
857 dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n",
858 wblock->req_buf_size);
859 ret = -EFAULT;
860 goto out_ioctl;
861 }
862
863 /* let the driver do any filtering and do the call */
864 wdriver = container_of(wblock->dev.dev.driver,
865 struct wmi_driver, driver);
866 if (!try_module_get(wdriver->driver.owner)) {
867 ret = -EBUSY;
868 goto out_ioctl;
869 }
870 ret = wdriver->filter_callback(&wblock->dev, cmd, buf);
871 module_put(wdriver->driver.owner);
872 if (ret)
873 goto out_ioctl;
874
875 /* return the result (only up to our internal buffer size) */
876 if (copy_to_user(input, buf, wblock->req_buf_size)) {
877 dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n",
878 wblock->req_buf_size);
879 ret = -EFAULT;
880 }
881
882 out_ioctl:
883 mutex_unlock(&wblock->char_mutex);
884 return ret;
885 }
886
887 static const struct file_operations wmi_fops = {
888 .owner = THIS_MODULE,
889 .read = wmi_char_read,
890 .open = wmi_char_open,
891 .unlocked_ioctl = wmi_ioctl,
892 .compat_ioctl = wmi_ioctl,
893 };
894
895 static int wmi_dev_probe(struct device *dev)
896 {
897 struct wmi_block *wblock = dev_to_wblock(dev);
898 struct wmi_driver *wdriver =
899 container_of(dev->driver, struct wmi_driver, driver);
900 int ret = 0;
901 char *buf;
902
903 if (ACPI_FAILURE(wmi_method_enable(wblock, 1)))
904 dev_warn(dev, "failed to enable device -- probing anyway\n");
905
906 if (wdriver->probe) {
907 ret = wdriver->probe(dev_to_wdev(dev));
908 if (ret != 0)
909 goto probe_failure;
910 }
911
912 /* driver wants a character device made */
913 if (wdriver->filter_callback) {
914 /* check that required buffer size declared by driver or MOF */
915 if (!wblock->req_buf_size) {
916 dev_err(&wblock->dev.dev,
917 "Required buffer size not set\n");
918 ret = -EINVAL;
919 goto probe_failure;
920 }
921
922 wblock->handler_data = kmalloc(wblock->req_buf_size,
923 GFP_KERNEL);
924 if (!wblock->handler_data) {
925 ret = -ENOMEM;
926 goto probe_failure;
927 }
928
929 buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name);
930 if (!buf) {
931 ret = -ENOMEM;
932 goto probe_string_failure;
933 }
934 wblock->char_dev.minor = MISC_DYNAMIC_MINOR;
935 wblock->char_dev.name = buf;
936 wblock->char_dev.fops = &wmi_fops;
937 wblock->char_dev.mode = 0444;
938 ret = misc_register(&wblock->char_dev);
939 if (ret) {
940 dev_warn(dev, "failed to register char dev: %d\n", ret);
941 ret = -ENOMEM;
942 goto probe_misc_failure;
943 }
944 }
945
946 return 0;
947
948 probe_misc_failure:
949 kfree(buf);
950 probe_string_failure:
951 kfree(wblock->handler_data);
952 probe_failure:
953 if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
954 dev_warn(dev, "failed to disable device\n");
955 return ret;
956 }
957
958 static int wmi_dev_remove(struct device *dev)
959 {
960 struct wmi_block *wblock = dev_to_wblock(dev);
961 struct wmi_driver *wdriver =
962 container_of(dev->driver, struct wmi_driver, driver);
963 int ret = 0;
964
965 if (wdriver->filter_callback) {
966 misc_deregister(&wblock->char_dev);
967 kfree(wblock->char_dev.name);
968 kfree(wblock->handler_data);
969 }
970
971 if (wdriver->remove)
972 ret = wdriver->remove(dev_to_wdev(dev));
973
974 if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
975 dev_warn(dev, "failed to disable device\n");
976
977 return ret;
978 }
979
980 static struct class wmi_bus_class = {
981 .name = "wmi_bus",
982 };
983
984 static struct bus_type wmi_bus_type = {
985 .name = "wmi",
986 .dev_groups = wmi_groups,
987 .match = wmi_dev_match,
988 .uevent = wmi_dev_uevent,
989 .probe = wmi_dev_probe,
990 .remove = wmi_dev_remove,
991 };
992
993 static struct device_type wmi_type_event = {
994 .name = "event",
995 .groups = wmi_event_groups,
996 .release = wmi_dev_release,
997 };
998
999 static struct device_type wmi_type_method = {
1000 .name = "method",
1001 .groups = wmi_method_groups,
1002 .release = wmi_dev_release,
1003 };
1004
1005 static struct device_type wmi_type_data = {
1006 .name = "data",
1007 .groups = wmi_data_groups,
1008 .release = wmi_dev_release,
1009 };
1010
1011 static int wmi_create_device(struct device *wmi_bus_dev,
1012 const struct guid_block *gblock,
1013 struct wmi_block *wblock,
1014 struct acpi_device *device)
1015 {
1016 struct acpi_device_info *info;
1017 char method[5];
1018 int result;
1019
1020 if (gblock->flags & ACPI_WMI_EVENT) {
1021 wblock->dev.dev.type = &wmi_type_event;
1022 goto out_init;
1023 }
1024
1025 if (gblock->flags & ACPI_WMI_METHOD) {
1026 wblock->dev.dev.type = &wmi_type_method;
1027 mutex_init(&wblock->char_mutex);
1028 goto out_init;
1029 }
1030
1031 /*
1032 * Data Block Query Control Method (WQxx by convention) is
1033 * required per the WMI documentation. If it is not present,
1034 * we ignore this data block.
1035 */
1036 strcpy(method, "WQ");
1037 strncat(method, wblock->gblock.object_id, 2);
1038 result = get_subobj_info(device->handle, method, &info);
1039
1040 if (result) {
1041 dev_warn(wmi_bus_dev,
1042 "%s data block query control method not found\n",
1043 method);
1044 return result;
1045 }
1046
1047 wblock->dev.dev.type = &wmi_type_data;
1048
1049 /*
1050 * The Microsoft documentation specifically states:
1051 *
1052 * Data blocks registered with only a single instance
1053 * can ignore the parameter.
1054 *
1055 * ACPICA will get mad at us if we call the method with the wrong number
1056 * of arguments, so check what our method expects. (On some Dell
1057 * laptops, WQxx may not be a method at all.)
1058 */
1059 if (info->type != ACPI_TYPE_METHOD || info->param_count == 0)
1060 wblock->read_takes_no_args = true;
1061
1062 kfree(info);
1063
1064 strcpy(method, "WS");
1065 strncat(method, wblock->gblock.object_id, 2);
1066 result = get_subobj_info(device->handle, method, NULL);
1067
1068 if (result == 0)
1069 wblock->dev.setable = true;
1070
1071 out_init:
1072 wblock->dev.dev.bus = &wmi_bus_type;
1073 wblock->dev.dev.parent = wmi_bus_dev;
1074
1075 dev_set_name(&wblock->dev.dev, "%pUL", gblock->guid);
1076
1077 device_initialize(&wblock->dev.dev);
1078
1079 return 0;
1080 }
1081
1082 static void wmi_free_devices(struct acpi_device *device)
1083 {
1084 struct wmi_block *wblock, *next;
1085
1086 /* Delete devices for all the GUIDs */
1087 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
1088 if (wblock->acpi_device == device) {
1089 list_del(&wblock->list);
1090 device_unregister(&wblock->dev.dev);
1091 }
1092 }
1093 }
1094
1095 static bool guid_already_parsed(struct acpi_device *device,
1096 const u8 *guid)
1097 {
1098 struct wmi_block *wblock;
1099
1100 list_for_each_entry(wblock, &wmi_block_list, list) {
1101 if (memcmp(wblock->gblock.guid, guid, 16) == 0) {
1102 /*
1103 * Because we historically didn't track the relationship
1104 * between GUIDs and ACPI nodes, we don't know whether
1105 * we need to suppress GUIDs that are unique on a
1106 * given node but duplicated across nodes.
1107 */
1108 dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n",
1109 guid, dev_name(&wblock->acpi_device->dev));
1110 return true;
1111 }
1112 }
1113
1114 return false;
1115 }
1116
1117 /*
1118 * Parse the _WDG method for the GUID data blocks
1119 */
1120 static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
1121 {
1122 struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
1123 const struct guid_block *gblock;
1124 struct wmi_block *wblock, *next;
1125 union acpi_object *obj;
1126 acpi_status status;
1127 int retval = 0;
1128 u32 i, total;
1129
1130 status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out);
1131 if (ACPI_FAILURE(status))
1132 return -ENXIO;
1133
1134 obj = (union acpi_object *) out.pointer;
1135 if (!obj)
1136 return -ENXIO;
1137
1138 if (obj->type != ACPI_TYPE_BUFFER) {
1139 retval = -ENXIO;
1140 goto out_free_pointer;
1141 }
1142
1143 gblock = (const struct guid_block *)obj->buffer.pointer;
1144 total = obj->buffer.length / sizeof(struct guid_block);
1145
1146 for (i = 0; i < total; i++) {
1147 if (debug_dump_wdg)
1148 wmi_dump_wdg(&gblock[i]);
1149
1150 /*
1151 * Some WMI devices, like those for nVidia hooks, have a
1152 * duplicate GUID. It's not clear what we should do in this
1153 * case yet, so for now, we'll just ignore the duplicate
1154 * for device creation.
1155 */
1156 if (guid_already_parsed(device, gblock[i].guid))
1157 continue;
1158
1159 wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
1160 if (!wblock) {
1161 retval = -ENOMEM;
1162 break;
1163 }
1164
1165 wblock->acpi_device = device;
1166 wblock->gblock = gblock[i];
1167
1168 retval = wmi_create_device(wmi_bus_dev, &gblock[i], wblock, device);
1169 if (retval) {
1170 kfree(wblock);
1171 continue;
1172 }
1173
1174 list_add_tail(&wblock->list, &wmi_block_list);
1175
1176 if (debug_event) {
1177 wblock->handler = wmi_notify_debug;
1178 wmi_method_enable(wblock, 1);
1179 }
1180 }
1181
1182 /*
1183 * Now that all of the devices are created, add them to the
1184 * device tree and probe subdrivers.
1185 */
1186 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
1187 if (wblock->acpi_device != device)
1188 continue;
1189
1190 retval = device_add(&wblock->dev.dev);
1191 if (retval) {
1192 dev_err(wmi_bus_dev, "failed to register %pUL\n",
1193 wblock->gblock.guid);
1194 if (debug_event)
1195 wmi_method_enable(wblock, 0);
1196 list_del(&wblock->list);
1197 put_device(&wblock->dev.dev);
1198 }
1199 }
1200
1201 out_free_pointer:
1202 kfree(out.pointer);
1203 return retval;
1204 }
1205
1206 /*
1207 * WMI can have EmbeddedControl access regions. In which case, we just want to
1208 * hand these off to the EC driver.
1209 */
1210 static acpi_status
1211 acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
1212 u32 bits, u64 *value,
1213 void *handler_context, void *region_context)
1214 {
1215 int result = 0, i = 0;
1216 u8 temp = 0;
1217
1218 if ((address > 0xFF) || !value)
1219 return AE_BAD_PARAMETER;
1220
1221 if (function != ACPI_READ && function != ACPI_WRITE)
1222 return AE_BAD_PARAMETER;
1223
1224 if (bits != 8)
1225 return AE_BAD_PARAMETER;
1226
1227 if (function == ACPI_READ) {
1228 result = ec_read(address, &temp);
1229 (*value) |= ((u64)temp) << i;
1230 } else {
1231 temp = 0xff & ((*value) >> i);
1232 result = ec_write(address, temp);
1233 }
1234
1235 switch (result) {
1236 case -EINVAL:
1237 return AE_BAD_PARAMETER;
1238 break;
1239 case -ENODEV:
1240 return AE_NOT_FOUND;
1241 break;
1242 case -ETIME:
1243 return AE_TIME;
1244 break;
1245 default:
1246 return AE_OK;
1247 }
1248 }
1249
1250 static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
1251 void *context)
1252 {
1253 struct guid_block *block;
1254 struct wmi_block *wblock;
1255 bool found_it = false;
1256
1257 list_for_each_entry(wblock, &wmi_block_list, list) {
1258 block = &wblock->gblock;
1259
1260 if (wblock->acpi_device->handle == handle &&
1261 (block->flags & ACPI_WMI_EVENT) &&
1262 (block->notify_id == event))
1263 {
1264 found_it = true;
1265 break;
1266 }
1267 }
1268
1269 if (!found_it)
1270 return;
1271
1272 /* If a driver is bound, then notify the driver. */
1273 if (wblock->dev.dev.driver) {
1274 struct wmi_driver *driver;
1275 struct acpi_object_list input;
1276 union acpi_object params[1];
1277 struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL };
1278 acpi_status status;
1279
1280 driver = container_of(wblock->dev.dev.driver,
1281 struct wmi_driver, driver);
1282
1283 input.count = 1;
1284 input.pointer = params;
1285 params[0].type = ACPI_TYPE_INTEGER;
1286 params[0].integer.value = event;
1287
1288 status = acpi_evaluate_object(wblock->acpi_device->handle,
1289 "_WED", &input, &evdata);
1290 if (ACPI_FAILURE(status)) {
1291 dev_warn(&wblock->dev.dev,
1292 "failed to get event data\n");
1293 return;
1294 }
1295
1296 if (driver->notify)
1297 driver->notify(&wblock->dev,
1298 (union acpi_object *)evdata.pointer);
1299
1300 kfree(evdata.pointer);
1301 } else if (wblock->handler) {
1302 /* Legacy handler */
1303 wblock->handler(event, wblock->handler_data);
1304 }
1305
1306 if (debug_event) {
1307 pr_info("DEBUG Event GUID: %pUL\n",
1308 wblock->gblock.guid);
1309 }
1310
1311 acpi_bus_generate_netlink_event(
1312 wblock->acpi_device->pnp.device_class,
1313 dev_name(&wblock->dev.dev),
1314 event, 0);
1315
1316 }
1317
1318 static int acpi_wmi_remove(struct platform_device *device)
1319 {
1320 struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
1321
1322 acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
1323 acpi_wmi_notify_handler);
1324 acpi_remove_address_space_handler(acpi_device->handle,
1325 ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
1326 wmi_free_devices(acpi_device);
1327 device_destroy(&wmi_bus_class, MKDEV(0, 0));
1328
1329 return 0;
1330 }
1331
1332 static int acpi_wmi_probe(struct platform_device *device)
1333 {
1334 struct acpi_device *acpi_device;
1335 struct device *wmi_bus_dev;
1336 acpi_status status;
1337 int error;
1338
1339 acpi_device = ACPI_COMPANION(&device->dev);
1340 if (!acpi_device) {
1341 dev_err(&device->dev, "ACPI companion is missing\n");
1342 return -ENODEV;
1343 }
1344
1345 status = acpi_install_address_space_handler(acpi_device->handle,
1346 ACPI_ADR_SPACE_EC,
1347 &acpi_wmi_ec_space_handler,
1348 NULL, NULL);
1349 if (ACPI_FAILURE(status)) {
1350 dev_err(&device->dev, "Error installing EC region handler\n");
1351 return -ENODEV;
1352 }
1353
1354 status = acpi_install_notify_handler(acpi_device->handle,
1355 ACPI_DEVICE_NOTIFY,
1356 acpi_wmi_notify_handler,
1357 NULL);
1358 if (ACPI_FAILURE(status)) {
1359 dev_err(&device->dev, "Error installing notify handler\n");
1360 error = -ENODEV;
1361 goto err_remove_ec_handler;
1362 }
1363
1364 wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0),
1365 NULL, "wmi_bus-%s", dev_name(&device->dev));
1366 if (IS_ERR(wmi_bus_dev)) {
1367 error = PTR_ERR(wmi_bus_dev);
1368 goto err_remove_notify_handler;
1369 }
1370 dev_set_drvdata(&device->dev, wmi_bus_dev);
1371
1372 error = parse_wdg(wmi_bus_dev, acpi_device);
1373 if (error) {
1374 pr_err("Failed to parse WDG method\n");
1375 goto err_remove_busdev;
1376 }
1377
1378 return 0;
1379
1380 err_remove_busdev:
1381 device_destroy(&wmi_bus_class, MKDEV(0, 0));
1382
1383 err_remove_notify_handler:
1384 acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
1385 acpi_wmi_notify_handler);
1386
1387 err_remove_ec_handler:
1388 acpi_remove_address_space_handler(acpi_device->handle,
1389 ACPI_ADR_SPACE_EC,
1390 &acpi_wmi_ec_space_handler);
1391
1392 return error;
1393 }
1394
1395 int __must_check __wmi_driver_register(struct wmi_driver *driver,
1396 struct module *owner)
1397 {
1398 driver->driver.owner = owner;
1399 driver->driver.bus = &wmi_bus_type;
1400
1401 return driver_register(&driver->driver);
1402 }
1403 EXPORT_SYMBOL(__wmi_driver_register);
1404
1405 void wmi_driver_unregister(struct wmi_driver *driver)
1406 {
1407 driver_unregister(&driver->driver);
1408 }
1409 EXPORT_SYMBOL(wmi_driver_unregister);
1410
1411 static int __init acpi_wmi_init(void)
1412 {
1413 int error;
1414
1415 if (acpi_disabled)
1416 return -ENODEV;
1417
1418 error = class_register(&wmi_bus_class);
1419 if (error)
1420 return error;
1421
1422 error = bus_register(&wmi_bus_type);
1423 if (error)
1424 goto err_unreg_class;
1425
1426 error = platform_driver_register(&acpi_wmi_driver);
1427 if (error) {
1428 pr_err("Error loading mapper\n");
1429 goto err_unreg_bus;
1430 }
1431
1432 return 0;
1433
1434 err_unreg_bus:
1435 bus_unregister(&wmi_bus_type);
1436
1437 err_unreg_class:
1438 class_unregister(&wmi_bus_class);
1439
1440 return error;
1441 }
1442
1443 static void __exit acpi_wmi_exit(void)
1444 {
1445 platform_driver_unregister(&acpi_wmi_driver);
1446 bus_unregister(&wmi_bus_type);
1447 class_unregister(&wmi_bus_class);
1448 }
1449
1450 subsys_initcall_sync(acpi_wmi_init);
1451 module_exit(acpi_wmi_exit);
Linux with added FPC-III support