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bff431e4 CC |
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 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or (at | |
16 | * your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, but | |
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License along | |
24 | * with this program; if not, write to the Free Software Foundation, Inc., | |
25 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
26 | * | |
27 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
28 | */ | |
29 | ||
8e07514d DT |
30 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
31 | ||
bff431e4 CC |
32 | #include <linux/kernel.h> |
33 | #include <linux/init.h> | |
34 | #include <linux/types.h> | |
1caab3c1 | 35 | #include <linux/device.h> |
bff431e4 CC |
36 | #include <linux/list.h> |
37 | #include <linux/acpi.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
7c52d551 | 39 | #include <linux/module.h> |
538d7eb8 | 40 | #include <linux/uuid.h> |
bff431e4 CC |
41 | |
42 | ACPI_MODULE_NAME("wmi"); | |
43 | MODULE_AUTHOR("Carlos Corbacho"); | |
44 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
45 | MODULE_LICENSE("GPL"); | |
46 | ||
47 | #define ACPI_WMI_CLASS "wmi" | |
48 | ||
762e1a2f | 49 | static LIST_HEAD(wmi_block_list); |
bff431e4 CC |
50 | |
51 | struct guid_block { | |
52 | char guid[16]; | |
53 | union { | |
54 | char object_id[2]; | |
55 | struct { | |
56 | unsigned char notify_id; | |
57 | unsigned char reserved; | |
58 | }; | |
59 | }; | |
60 | u8 instance_count; | |
61 | u8 flags; | |
62 | }; | |
63 | ||
64 | struct wmi_block { | |
65 | struct list_head list; | |
66 | struct guid_block gblock; | |
67 | acpi_handle handle; | |
68 | wmi_notify_handler handler; | |
69 | void *handler_data; | |
c64eefd4 | 70 | struct device dev; |
bff431e4 CC |
71 | }; |
72 | ||
bff431e4 CC |
73 | |
74 | /* | |
75 | * If the GUID data block is marked as expensive, we must enable and | |
76 | * explicitily disable data collection. | |
77 | */ | |
78 | #define ACPI_WMI_EXPENSIVE 0x1 | |
79 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
80 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
81 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
82 | ||
90ab5ee9 | 83 | static bool debug_event; |
fc3155b2 TR |
84 | module_param(debug_event, bool, 0444); |
85 | MODULE_PARM_DESC(debug_event, | |
86 | "Log WMI Events [0/1]"); | |
87 | ||
90ab5ee9 | 88 | static bool debug_dump_wdg; |
a929aae0 TR |
89 | module_param(debug_dump_wdg, bool, 0444); |
90 | MODULE_PARM_DESC(debug_dump_wdg, | |
91 | "Dump available WMI interfaces [0/1]"); | |
92 | ||
51fac838 | 93 | static int acpi_wmi_remove(struct acpi_device *device); |
bff431e4 | 94 | static int acpi_wmi_add(struct acpi_device *device); |
f61bb939 | 95 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
96 | |
97 | static const struct acpi_device_id wmi_device_ids[] = { | |
98 | {"PNP0C14", 0}, | |
99 | {"pnp0c14", 0}, | |
100 | {"", 0}, | |
101 | }; | |
102 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
103 | ||
104 | static struct acpi_driver acpi_wmi_driver = { | |
105 | .name = "wmi", | |
106 | .class = ACPI_WMI_CLASS, | |
107 | .ids = wmi_device_ids, | |
108 | .ops = { | |
109 | .add = acpi_wmi_add, | |
110 | .remove = acpi_wmi_remove, | |
f61bb939 | 111 | .notify = acpi_wmi_notify, |
c64eefd4 | 112 | }, |
bff431e4 CC |
113 | }; |
114 | ||
115 | /* | |
116 | * GUID parsing functions | |
117 | */ | |
118 | ||
bff431e4 CC |
119 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
120 | { | |
538d7eb8 | 121 | uuid_le guid_input; |
bff431e4 CC |
122 | struct wmi_block *wblock; |
123 | struct guid_block *block; | |
124 | struct list_head *p; | |
125 | ||
538d7eb8 AS |
126 | if (uuid_le_to_bin(guid_string, &guid_input)) |
127 | return false; | |
bff431e4 | 128 | |
762e1a2f | 129 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
130 | wblock = list_entry(p, struct wmi_block, list); |
131 | block = &wblock->gblock; | |
132 | ||
538d7eb8 | 133 | if (memcmp(block->guid, &guid_input, 16) == 0) { |
bff431e4 CC |
134 | if (out) |
135 | *out = wblock; | |
097c27fc | 136 | return true; |
bff431e4 CC |
137 | } |
138 | } | |
097c27fc | 139 | return false; |
bff431e4 CC |
140 | } |
141 | ||
a66bfa7a MG |
142 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
143 | { | |
144 | struct guid_block *block = NULL; | |
145 | char method[5]; | |
a66bfa7a MG |
146 | acpi_status status; |
147 | acpi_handle handle; | |
148 | ||
149 | block = &wblock->gblock; | |
150 | handle = wblock->handle; | |
151 | ||
a66bfa7a | 152 | snprintf(method, 5, "WE%02X", block->notify_id); |
8122ab66 | 153 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
154 | |
155 | if (status != AE_OK && status != AE_NOT_FOUND) | |
156 | return status; | |
157 | else | |
158 | return AE_OK; | |
159 | } | |
160 | ||
bff431e4 CC |
161 | /* |
162 | * Exported WMI functions | |
163 | */ | |
164 | /** | |
165 | * wmi_evaluate_method - Evaluate a WMI method | |
166 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
167 | * @instance: Instance index | |
168 | * @method_id: Method ID to call | |
169 | * &in: Buffer containing input for the method call | |
170 | * &out: Empty buffer to return the method results | |
171 | * | |
172 | * Call an ACPI-WMI method | |
173 | */ | |
174 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
175 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
176 | { | |
177 | struct guid_block *block = NULL; | |
178 | struct wmi_block *wblock = NULL; | |
179 | acpi_handle handle; | |
180 | acpi_status status; | |
181 | struct acpi_object_list input; | |
182 | union acpi_object params[3]; | |
f3d83e24 | 183 | char method[5] = "WM"; |
bff431e4 CC |
184 | |
185 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 186 | return AE_ERROR; |
bff431e4 CC |
187 | |
188 | block = &wblock->gblock; | |
189 | handle = wblock->handle; | |
190 | ||
e6bafba5 | 191 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
192 | return AE_BAD_DATA; |
193 | ||
194 | if (block->instance_count < instance) | |
195 | return AE_BAD_PARAMETER; | |
196 | ||
197 | input.count = 2; | |
198 | input.pointer = params; | |
199 | params[0].type = ACPI_TYPE_INTEGER; | |
200 | params[0].integer.value = instance; | |
201 | params[1].type = ACPI_TYPE_INTEGER; | |
202 | params[1].integer.value = method_id; | |
203 | ||
204 | if (in) { | |
205 | input.count = 3; | |
206 | ||
207 | if (block->flags & ACPI_WMI_STRING) { | |
208 | params[2].type = ACPI_TYPE_STRING; | |
209 | } else { | |
210 | params[2].type = ACPI_TYPE_BUFFER; | |
211 | } | |
212 | params[2].buffer.length = in->length; | |
213 | params[2].buffer.pointer = in->pointer; | |
214 | } | |
215 | ||
216 | strncat(method, block->object_id, 2); | |
217 | ||
218 | status = acpi_evaluate_object(handle, method, &input, out); | |
219 | ||
220 | return status; | |
221 | } | |
222 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
223 | ||
224 | /** | |
225 | * wmi_query_block - Return contents of a WMI block | |
226 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
227 | * @instance: Instance index | |
228 | * &out: Empty buffer to return the contents of the data block to | |
229 | * | |
230 | * Return the contents of an ACPI-WMI data block to a buffer | |
231 | */ | |
232 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
233 | struct acpi_buffer *out) | |
234 | { | |
235 | struct guid_block *block = NULL; | |
236 | struct wmi_block *wblock = NULL; | |
54f14c27 | 237 | acpi_handle handle; |
bff431e4 | 238 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
239 | struct acpi_object_list input; |
240 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
241 | char method[5]; |
242 | char wc_method[5] = "WC"; | |
bff431e4 CC |
243 | |
244 | if (!guid_string || !out) | |
245 | return AE_BAD_PARAMETER; | |
246 | ||
247 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 248 | return AE_ERROR; |
bff431e4 CC |
249 | |
250 | block = &wblock->gblock; | |
251 | handle = wblock->handle; | |
252 | ||
253 | if (block->instance_count < instance) | |
254 | return AE_BAD_PARAMETER; | |
255 | ||
256 | /* Check GUID is a data block */ | |
257 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 258 | return AE_ERROR; |
bff431e4 CC |
259 | |
260 | input.count = 1; | |
261 | input.pointer = wq_params; | |
262 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
263 | wq_params[0].integer.value = instance; | |
264 | ||
265 | /* | |
266 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
267 | * enable collection. | |
268 | */ | |
269 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
270 | strncat(wc_method, block->object_id, 2); |
271 | ||
272 | /* | |
273 | * Some GUIDs break the specification by declaring themselves | |
274 | * expensive, but have no corresponding WCxx method. So we | |
275 | * should not fail if this happens. | |
276 | */ | |
54f14c27 | 277 | if (acpi_has_method(handle, wc_method)) |
8122ab66 ZR |
278 | wc_status = acpi_execute_simple_method(handle, |
279 | wc_method, 1); | |
bff431e4 CC |
280 | } |
281 | ||
282 | strcpy(method, "WQ"); | |
283 | strncat(method, block->object_id, 2); | |
284 | ||
dab36ad8 | 285 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
286 | |
287 | /* | |
288 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
289 | * the WQxx method failed - we should disable collection anyway. | |
290 | */ | |
a527f2d7 | 291 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8122ab66 | 292 | status = acpi_execute_simple_method(handle, wc_method, 0); |
bff431e4 CC |
293 | } |
294 | ||
295 | return status; | |
296 | } | |
297 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
298 | ||
299 | /** | |
300 | * wmi_set_block - Write to a WMI block | |
301 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
302 | * @instance: Instance index | |
303 | * &in: Buffer containing new values for the data block | |
304 | * | |
305 | * Write the contents of the input buffer to an ACPI-WMI data block | |
306 | */ | |
307 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
308 | const struct acpi_buffer *in) | |
309 | { | |
310 | struct guid_block *block = NULL; | |
311 | struct wmi_block *wblock = NULL; | |
312 | acpi_handle handle; | |
313 | struct acpi_object_list input; | |
314 | union acpi_object params[2]; | |
f3d83e24 | 315 | char method[5] = "WS"; |
bff431e4 CC |
316 | |
317 | if (!guid_string || !in) | |
318 | return AE_BAD_DATA; | |
319 | ||
320 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 321 | return AE_ERROR; |
bff431e4 CC |
322 | |
323 | block = &wblock->gblock; | |
324 | handle = wblock->handle; | |
325 | ||
326 | if (block->instance_count < instance) | |
327 | return AE_BAD_PARAMETER; | |
328 | ||
329 | /* Check GUID is a data block */ | |
330 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 331 | return AE_ERROR; |
bff431e4 CC |
332 | |
333 | input.count = 2; | |
334 | input.pointer = params; | |
335 | params[0].type = ACPI_TYPE_INTEGER; | |
336 | params[0].integer.value = instance; | |
337 | ||
338 | if (block->flags & ACPI_WMI_STRING) { | |
339 | params[1].type = ACPI_TYPE_STRING; | |
340 | } else { | |
341 | params[1].type = ACPI_TYPE_BUFFER; | |
342 | } | |
343 | params[1].buffer.length = in->length; | |
344 | params[1].buffer.pointer = in->pointer; | |
345 | ||
346 | strncat(method, block->object_id, 2); | |
347 | ||
348 | return acpi_evaluate_object(handle, method, &input, NULL); | |
349 | } | |
350 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
351 | ||
37830662 | 352 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 | 353 | { |
85b4e4eb | 354 | pr_info("%pUL:\n", g->guid); |
8e07514d DT |
355 | pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]); |
356 | pr_info("\tnotify_id: %02X\n", g->notify_id); | |
357 | pr_info("\treserved: %02X\n", g->reserved); | |
358 | pr_info("\tinstance_count: %d\n", g->instance_count); | |
dd8e908e | 359 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 360 | if (g->flags) { |
a929aae0 | 361 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 362 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 363 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 364 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 365 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 366 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 367 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 368 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 369 | } |
8e07514d | 370 | pr_cont("\n"); |
a929aae0 TR |
371 | |
372 | } | |
373 | ||
fc3155b2 TR |
374 | static void wmi_notify_debug(u32 value, void *context) |
375 | { | |
376 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
377 | union acpi_object *obj; | |
1492616a | 378 | acpi_status status; |
fc3155b2 | 379 | |
1492616a AL |
380 | status = wmi_get_event_data(value, &response); |
381 | if (status != AE_OK) { | |
8e07514d | 382 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
383 | return; |
384 | } | |
fc3155b2 TR |
385 | |
386 | obj = (union acpi_object *)response.pointer; | |
387 | ||
388 | if (!obj) | |
389 | return; | |
390 | ||
8e07514d | 391 | pr_info("DEBUG Event "); |
fc3155b2 TR |
392 | switch(obj->type) { |
393 | case ACPI_TYPE_BUFFER: | |
8e07514d | 394 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
395 | break; |
396 | case ACPI_TYPE_STRING: | |
8e07514d | 397 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
398 | break; |
399 | case ACPI_TYPE_INTEGER: | |
8e07514d | 400 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
401 | break; |
402 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 403 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
404 | break; |
405 | default: | |
8e07514d | 406 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 407 | } |
1492616a | 408 | kfree(obj); |
fc3155b2 TR |
409 | } |
410 | ||
bff431e4 CC |
411 | /** |
412 | * wmi_install_notify_handler - Register handler for WMI events | |
413 | * @handler: Function to handle notifications | |
414 | * @data: Data to be returned to handler when event is fired | |
415 | * | |
416 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
417 | */ | |
418 | acpi_status wmi_install_notify_handler(const char *guid, | |
419 | wmi_notify_handler handler, void *data) | |
420 | { | |
421 | struct wmi_block *block; | |
58f6425e | 422 | acpi_status status = AE_NOT_EXIST; |
538d7eb8 | 423 | uuid_le guid_input; |
58f6425e | 424 | struct list_head *p; |
bff431e4 CC |
425 | |
426 | if (!guid || !handler) | |
427 | return AE_BAD_PARAMETER; | |
428 | ||
538d7eb8 AS |
429 | if (uuid_le_to_bin(guid, &guid_input)) |
430 | return AE_BAD_PARAMETER; | |
bff431e4 | 431 | |
58f6425e CK |
432 | list_for_each(p, &wmi_block_list) { |
433 | acpi_status wmi_status; | |
434 | block = list_entry(p, struct wmi_block, list); | |
435 | ||
538d7eb8 | 436 | if (memcmp(block->gblock.guid, &guid_input, 16) == 0) { |
58f6425e CK |
437 | if (block->handler && |
438 | block->handler != wmi_notify_debug) | |
439 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 440 | |
58f6425e CK |
441 | block->handler = handler; |
442 | block->handler_data = data; | |
bff431e4 | 443 | |
58f6425e CK |
444 | wmi_status = wmi_method_enable(block, 1); |
445 | if ((wmi_status != AE_OK) || | |
446 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
447 | status = wmi_status; | |
448 | } | |
449 | } | |
a66bfa7a MG |
450 | |
451 | return status; | |
bff431e4 CC |
452 | } |
453 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
454 | ||
455 | /** | |
456 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
457 | * | |
458 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
459 | */ | |
460 | acpi_status wmi_remove_notify_handler(const char *guid) | |
461 | { | |
462 | struct wmi_block *block; | |
58f6425e | 463 | acpi_status status = AE_NOT_EXIST; |
538d7eb8 | 464 | uuid_le guid_input; |
58f6425e | 465 | struct list_head *p; |
bff431e4 CC |
466 | |
467 | if (!guid) | |
468 | return AE_BAD_PARAMETER; | |
469 | ||
538d7eb8 AS |
470 | if (uuid_le_to_bin(guid, &guid_input)) |
471 | return AE_BAD_PARAMETER; | |
bff431e4 | 472 | |
58f6425e CK |
473 | list_for_each(p, &wmi_block_list) { |
474 | acpi_status wmi_status; | |
475 | block = list_entry(p, struct wmi_block, list); | |
476 | ||
538d7eb8 | 477 | if (memcmp(block->gblock.guid, &guid_input, 16) == 0) { |
58f6425e CK |
478 | if (!block->handler || |
479 | block->handler == wmi_notify_debug) | |
480 | return AE_NULL_ENTRY; | |
481 | ||
482 | if (debug_event) { | |
483 | block->handler = wmi_notify_debug; | |
484 | status = AE_OK; | |
485 | } else { | |
486 | wmi_status = wmi_method_enable(block, 0); | |
487 | block->handler = NULL; | |
488 | block->handler_data = NULL; | |
489 | if ((wmi_status != AE_OK) || | |
490 | ((wmi_status == AE_OK) && | |
491 | (status == AE_NOT_EXIST))) | |
492 | status = wmi_status; | |
493 | } | |
494 | } | |
fc3155b2 | 495 | } |
58f6425e | 496 | |
a66bfa7a | 497 | return status; |
bff431e4 CC |
498 | } |
499 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
500 | ||
501 | /** | |
502 | * wmi_get_event_data - Get WMI data associated with an event | |
503 | * | |
3e9b988e AA |
504 | * @event: Event to find |
505 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
506 | * |
507 | * Returns extra data associated with an event in WMI. | |
508 | */ | |
509 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
510 | { | |
511 | struct acpi_object_list input; | |
512 | union acpi_object params[1]; | |
513 | struct guid_block *gblock; | |
514 | struct wmi_block *wblock; | |
515 | struct list_head *p; | |
516 | ||
517 | input.count = 1; | |
518 | input.pointer = params; | |
519 | params[0].type = ACPI_TYPE_INTEGER; | |
520 | params[0].integer.value = event; | |
521 | ||
762e1a2f | 522 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
523 | wblock = list_entry(p, struct wmi_block, list); |
524 | gblock = &wblock->gblock; | |
525 | ||
526 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
527 | (gblock->notify_id == event)) | |
528 | return acpi_evaluate_object(wblock->handle, "_WED", | |
529 | &input, out); | |
530 | } | |
531 | ||
532 | return AE_NOT_FOUND; | |
533 | } | |
534 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
535 | ||
536 | /** | |
537 | * wmi_has_guid - Check if a GUID is available | |
538 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
539 | * | |
540 | * Check if a given GUID is defined by _WDG | |
541 | */ | |
542 | bool wmi_has_guid(const char *guid_string) | |
543 | { | |
544 | return find_guid(guid_string, NULL); | |
545 | } | |
546 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
547 | ||
1caab3c1 MG |
548 | /* |
549 | * sysfs interface | |
550 | */ | |
614ef432 | 551 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
552 | char *buf) |
553 | { | |
1caab3c1 MG |
554 | struct wmi_block *wblock; |
555 | ||
556 | wblock = dev_get_drvdata(dev); | |
a80e1053 PB |
557 | if (!wblock) { |
558 | strcat(buf, "\n"); | |
559 | return strlen(buf); | |
560 | } | |
1caab3c1 | 561 | |
85b4e4eb | 562 | return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid); |
1caab3c1 | 563 | } |
e80b89a5 | 564 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 565 | |
e80b89a5 GKH |
566 | static struct attribute *wmi_attrs[] = { |
567 | &dev_attr_modalias.attr, | |
568 | NULL, | |
614ef432 | 569 | }; |
e80b89a5 | 570 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 MG |
571 | |
572 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
573 | { | |
574 | char guid_string[37]; | |
575 | ||
576 | struct wmi_block *wblock; | |
577 | ||
578 | if (add_uevent_var(env, "MODALIAS=")) | |
579 | return -ENOMEM; | |
580 | ||
581 | wblock = dev_get_drvdata(dev); | |
582 | if (!wblock) | |
583 | return -ENOMEM; | |
584 | ||
85b4e4eb | 585 | sprintf(guid_string, "%pUL", wblock->gblock.guid); |
1caab3c1 MG |
586 | |
587 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
588 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
589 | env->buflen += 40; | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static void wmi_dev_free(struct device *dev) | |
595 | { | |
c64eefd4 DT |
596 | struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev); |
597 | ||
598 | kfree(wmi_block); | |
1caab3c1 MG |
599 | } |
600 | ||
601 | static struct class wmi_class = { | |
602 | .name = "wmi", | |
603 | .dev_release = wmi_dev_free, | |
604 | .dev_uevent = wmi_dev_uevent, | |
e80b89a5 | 605 | .dev_groups = wmi_groups, |
1caab3c1 MG |
606 | }; |
607 | ||
58f6425e CK |
608 | static int wmi_create_device(const struct guid_block *gblock, |
609 | struct wmi_block *wblock, acpi_handle handle) | |
1caab3c1 | 610 | { |
c64eefd4 | 611 | wblock->dev.class = &wmi_class; |
1caab3c1 | 612 | |
85b4e4eb | 613 | dev_set_name(&wblock->dev, "%pUL", gblock->guid); |
1caab3c1 | 614 | |
c64eefd4 | 615 | dev_set_drvdata(&wblock->dev, wblock); |
1caab3c1 | 616 | |
58f6425e | 617 | return device_register(&wblock->dev); |
1caab3c1 MG |
618 | } |
619 | ||
c64eefd4 | 620 | static void wmi_free_devices(void) |
1caab3c1 | 621 | { |
c64eefd4 | 622 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
623 | |
624 | /* Delete devices for all the GUIDs */ | |
023b9565 DT |
625 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
626 | list_del(&wblock->list); | |
58f6425e CK |
627 | if (wblock->dev.class) |
628 | device_unregister(&wblock->dev); | |
023b9565 DT |
629 | else |
630 | kfree(wblock); | |
631 | } | |
1caab3c1 MG |
632 | } |
633 | ||
d1f9e497 CC |
634 | static bool guid_already_parsed(const char *guid_string) |
635 | { | |
d1f9e497 | 636 | struct wmi_block *wblock; |
d1f9e497 | 637 | |
c64eefd4 | 638 | list_for_each_entry(wblock, &wmi_block_list, list) |
8b14d7b2 | 639 | if (memcmp(wblock->gblock.guid, guid_string, 16) == 0) |
d1f9e497 | 640 | return true; |
d1f9e497 | 641 | |
c64eefd4 | 642 | return false; |
2d5ab555 DT |
643 | } |
644 | ||
bff431e4 CC |
645 | /* |
646 | * Parse the _WDG method for the GUID data blocks | |
647 | */ | |
0a018a68 | 648 | static int parse_wdg(acpi_handle handle) |
bff431e4 CC |
649 | { |
650 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
651 | union acpi_object *obj; | |
37830662 | 652 | const struct guid_block *gblock; |
bff431e4 CC |
653 | struct wmi_block *wblock; |
654 | acpi_status status; | |
c64eefd4 | 655 | int retval; |
bff431e4 CC |
656 | u32 i, total; |
657 | ||
658 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
bff431e4 | 659 | if (ACPI_FAILURE(status)) |
c64eefd4 | 660 | return -ENXIO; |
bff431e4 CC |
661 | |
662 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 663 | if (!obj) |
c64eefd4 | 664 | return -ENXIO; |
bff431e4 | 665 | |
64ed0ab8 | 666 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 667 | retval = -ENXIO; |
64ed0ab8 DT |
668 | goto out_free_pointer; |
669 | } | |
bff431e4 | 670 | |
37830662 | 671 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
672 | total = obj->buffer.length / sizeof(struct guid_block); |
673 | ||
bff431e4 | 674 | for (i = 0; i < total; i++) { |
58f6425e CK |
675 | if (debug_dump_wdg) |
676 | wmi_dump_wdg(&gblock[i]); | |
677 | ||
678 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
679 | if (!wblock) | |
0a018a68 | 680 | return -ENOMEM; |
58f6425e CK |
681 | |
682 | wblock->handle = handle; | |
683 | wblock->gblock = gblock[i]; | |
684 | ||
d1f9e497 CC |
685 | /* |
686 | Some WMI devices, like those for nVidia hooks, have a | |
687 | duplicate GUID. It's not clear what we should do in this | |
58f6425e CK |
688 | case yet, so for now, we'll just ignore the duplicate |
689 | for device creation. | |
d1f9e497 | 690 | */ |
58f6425e CK |
691 | if (!guid_already_parsed(gblock[i].guid)) { |
692 | retval = wmi_create_device(&gblock[i], wblock, handle); | |
693 | if (retval) { | |
694 | wmi_free_devices(); | |
e1e0dacb | 695 | goto out_free_pointer; |
58f6425e | 696 | } |
d1f9e497 | 697 | } |
c64eefd4 | 698 | |
58f6425e | 699 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 700 | |
fc3155b2 TR |
701 | if (debug_event) { |
702 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 703 | wmi_method_enable(wblock, 1); |
fc3155b2 | 704 | } |
bff431e4 CC |
705 | } |
706 | ||
c64eefd4 DT |
707 | retval = 0; |
708 | ||
a5167c5b AL |
709 | out_free_pointer: |
710 | kfree(out.pointer); | |
bff431e4 | 711 | |
c64eefd4 | 712 | return retval; |
bff431e4 CC |
713 | } |
714 | ||
715 | /* | |
716 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
717 | * hand these off to the EC driver. | |
718 | */ | |
719 | static acpi_status | |
720 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 721 | u32 bits, u64 *value, |
bff431e4 CC |
722 | void *handler_context, void *region_context) |
723 | { | |
724 | int result = 0, i = 0; | |
725 | u8 temp = 0; | |
726 | ||
727 | if ((address > 0xFF) || !value) | |
728 | return AE_BAD_PARAMETER; | |
729 | ||
730 | if (function != ACPI_READ && function != ACPI_WRITE) | |
731 | return AE_BAD_PARAMETER; | |
732 | ||
733 | if (bits != 8) | |
734 | return AE_BAD_PARAMETER; | |
735 | ||
736 | if (function == ACPI_READ) { | |
737 | result = ec_read(address, &temp); | |
439913ff | 738 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
739 | } else { |
740 | temp = 0xff & ((*value) >> i); | |
741 | result = ec_write(address, temp); | |
742 | } | |
743 | ||
744 | switch (result) { | |
745 | case -EINVAL: | |
746 | return AE_BAD_PARAMETER; | |
747 | break; | |
748 | case -ENODEV: | |
749 | return AE_NOT_FOUND; | |
750 | break; | |
751 | case -ETIME: | |
752 | return AE_TIME; | |
753 | break; | |
754 | default: | |
755 | return AE_OK; | |
756 | } | |
757 | } | |
758 | ||
f61bb939 | 759 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
760 | { |
761 | struct guid_block *block; | |
762 | struct wmi_block *wblock; | |
763 | struct list_head *p; | |
bff431e4 | 764 | |
762e1a2f | 765 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
766 | wblock = list_entry(p, struct wmi_block, list); |
767 | block = &wblock->gblock; | |
768 | ||
769 | if ((block->flags & ACPI_WMI_EVENT) && | |
770 | (block->notify_id == event)) { | |
771 | if (wblock->handler) | |
772 | wblock->handler(event, wblock->handler_data); | |
7715348c | 773 | if (debug_event) { |
85b4e4eb RV |
774 | pr_info("DEBUG Event GUID: %pUL\n", |
775 | wblock->gblock.guid); | |
7715348c | 776 | } |
bff431e4 CC |
777 | |
778 | acpi_bus_generate_netlink_event( | |
0794469d | 779 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
780 | event, 0); |
781 | break; | |
782 | } | |
783 | } | |
784 | } | |
785 | ||
51fac838 | 786 | static int acpi_wmi_remove(struct acpi_device *device) |
bff431e4 | 787 | { |
bff431e4 CC |
788 | acpi_remove_address_space_handler(device->handle, |
789 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
c64eefd4 | 790 | wmi_free_devices(); |
bff431e4 CC |
791 | |
792 | return 0; | |
793 | } | |
794 | ||
925b1089 | 795 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
796 | { |
797 | acpi_status status; | |
c64eefd4 | 798 | int error; |
bff431e4 | 799 | |
bff431e4 CC |
800 | status = acpi_install_address_space_handler(device->handle, |
801 | ACPI_ADR_SPACE_EC, | |
802 | &acpi_wmi_ec_space_handler, | |
803 | NULL, NULL); | |
5212cd67 | 804 | if (ACPI_FAILURE(status)) { |
8e07514d | 805 | pr_err("Error installing EC region handler\n"); |
bff431e4 | 806 | return -ENODEV; |
5212cd67 | 807 | } |
bff431e4 | 808 | |
c64eefd4 DT |
809 | error = parse_wdg(device->handle); |
810 | if (error) { | |
5212cd67 DT |
811 | acpi_remove_address_space_handler(device->handle, |
812 | ACPI_ADR_SPACE_EC, | |
813 | &acpi_wmi_ec_space_handler); | |
8e07514d | 814 | pr_err("Failed to parse WDG method\n"); |
c64eefd4 | 815 | return error; |
bff431e4 CC |
816 | } |
817 | ||
c64eefd4 | 818 | return 0; |
bff431e4 CC |
819 | } |
820 | ||
821 | static int __init acpi_wmi_init(void) | |
822 | { | |
c64eefd4 | 823 | int error; |
bff431e4 CC |
824 | |
825 | if (acpi_disabled) | |
826 | return -ENODEV; | |
827 | ||
c64eefd4 DT |
828 | error = class_register(&wmi_class); |
829 | if (error) | |
830 | return error; | |
1caab3c1 | 831 | |
c64eefd4 DT |
832 | error = acpi_bus_register_driver(&acpi_wmi_driver); |
833 | if (error) { | |
834 | pr_err("Error loading mapper\n"); | |
835 | class_unregister(&wmi_class); | |
836 | return error; | |
bff431e4 CC |
837 | } |
838 | ||
8e07514d | 839 | pr_info("Mapper loaded\n"); |
8e07514d | 840 | return 0; |
bff431e4 CC |
841 | } |
842 | ||
843 | static void __exit acpi_wmi_exit(void) | |
844 | { | |
bff431e4 | 845 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
c64eefd4 | 846 | class_unregister(&wmi_class); |
bff431e4 | 847 | |
8e07514d | 848 | pr_info("Mapper unloaded\n"); |
bff431e4 CC |
849 | } |
850 | ||
851 | subsys_initcall(acpi_wmi_init); | |
852 | module_exit(acpi_wmi_exit); |