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