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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> |
bff431e4 CC |
40 | |
41 | ACPI_MODULE_NAME("wmi"); | |
42 | MODULE_AUTHOR("Carlos Corbacho"); | |
43 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
44 | MODULE_LICENSE("GPL"); | |
45 | ||
46 | #define ACPI_WMI_CLASS "wmi" | |
47 | ||
762e1a2f | 48 | static LIST_HEAD(wmi_block_list); |
bff431e4 CC |
49 | |
50 | struct guid_block { | |
51 | char guid[16]; | |
52 | union { | |
53 | char object_id[2]; | |
54 | struct { | |
55 | unsigned char notify_id; | |
56 | unsigned char reserved; | |
57 | }; | |
58 | }; | |
59 | u8 instance_count; | |
60 | u8 flags; | |
61 | }; | |
62 | ||
63 | struct wmi_block { | |
64 | struct list_head list; | |
65 | struct guid_block gblock; | |
66 | acpi_handle handle; | |
67 | wmi_notify_handler handler; | |
68 | void *handler_data; | |
c64eefd4 | 69 | struct device dev; |
bff431e4 CC |
70 | }; |
71 | ||
bff431e4 CC |
72 | |
73 | /* | |
74 | * If the GUID data block is marked as expensive, we must enable and | |
75 | * explicitily disable data collection. | |
76 | */ | |
77 | #define ACPI_WMI_EXPENSIVE 0x1 | |
78 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
79 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
80 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
81 | ||
90ab5ee9 | 82 | static bool debug_event; |
fc3155b2 TR |
83 | module_param(debug_event, bool, 0444); |
84 | MODULE_PARM_DESC(debug_event, | |
85 | "Log WMI Events [0/1]"); | |
86 | ||
90ab5ee9 | 87 | static bool debug_dump_wdg; |
a929aae0 TR |
88 | module_param(debug_dump_wdg, bool, 0444); |
89 | MODULE_PARM_DESC(debug_dump_wdg, | |
90 | "Dump available WMI interfaces [0/1]"); | |
91 | ||
51fac838 | 92 | static int acpi_wmi_remove(struct acpi_device *device); |
bff431e4 | 93 | static int acpi_wmi_add(struct acpi_device *device); |
f61bb939 | 94 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
95 | |
96 | static const struct acpi_device_id wmi_device_ids[] = { | |
97 | {"PNP0C14", 0}, | |
98 | {"pnp0c14", 0}, | |
99 | {"", 0}, | |
100 | }; | |
101 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
102 | ||
103 | static struct acpi_driver acpi_wmi_driver = { | |
104 | .name = "wmi", | |
105 | .class = ACPI_WMI_CLASS, | |
106 | .ids = wmi_device_ids, | |
107 | .ops = { | |
108 | .add = acpi_wmi_add, | |
109 | .remove = acpi_wmi_remove, | |
f61bb939 | 110 | .notify = acpi_wmi_notify, |
c64eefd4 | 111 | }, |
bff431e4 CC |
112 | }; |
113 | ||
114 | /* | |
115 | * GUID parsing functions | |
116 | */ | |
117 | ||
118 | /** | |
119 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
120 | * @src: Pointer to at least 2 characters to convert. | |
121 | * | |
122 | * Convert a two character ASCII hex string to a number. | |
123 | * | |
124 | * Return: 0-255 Success, the byte was parsed correctly | |
125 | * -1 Error, an invalid character was supplied | |
126 | */ | |
127 | static int wmi_parse_hexbyte(const u8 *src) | |
128 | { | |
bff431e4 | 129 | int h; |
392bd8b5 | 130 | int value; |
bff431e4 CC |
131 | |
132 | /* high part */ | |
392bd8b5 AS |
133 | h = value = hex_to_bin(src[0]); |
134 | if (value < 0) | |
bff431e4 | 135 | return -1; |
bff431e4 CC |
136 | |
137 | /* low part */ | |
392bd8b5 AS |
138 | value = hex_to_bin(src[1]); |
139 | if (value >= 0) | |
140 | return (h << 4) | value; | |
bff431e4 CC |
141 | return -1; |
142 | } | |
143 | ||
144 | /** | |
145 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
146 | * @src: Memory block holding binary GUID (16 bytes) | |
147 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
148 | * | |
149 | * Byte swap a binary GUID to match it's real GUID value | |
150 | */ | |
151 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
152 | { | |
153 | int i; | |
154 | ||
155 | for (i = 0; i <= 3; i++) | |
156 | memcpy(dest + i, src + (3 - i), 1); | |
157 | ||
158 | for (i = 0; i <= 1; i++) | |
159 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
160 | ||
161 | for (i = 0; i <= 1; i++) | |
162 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
163 | ||
164 | memcpy(dest + 8, src + 8, 8); | |
165 | } | |
166 | ||
167 | /** | |
168 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
169 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
170 | * @dest: Memory block to hold binary GUID (16 bytes) | |
171 | * | |
172 | * N.B. The GUID need not be NULL terminated. | |
173 | * | |
174 | * Return: 'true' @dest contains binary GUID | |
175 | * 'false' @dest contents are undefined | |
176 | */ | |
177 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
178 | { | |
179 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
180 | int i, j, v; | |
181 | ||
182 | if (src[8] != '-' || src[13] != '-' || | |
183 | src[18] != '-' || src[23] != '-') | |
184 | return false; | |
185 | ||
186 | for (j = 0; j < 5; j++, src++) { | |
187 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
188 | v = wmi_parse_hexbyte(src); | |
189 | if (v < 0) | |
190 | return false; | |
191 | } | |
192 | } | |
193 | ||
194 | return true; | |
195 | } | |
196 | ||
197 | static bool find_guid(const char *guid_string, struct wmi_block **out) | |
198 | { | |
199 | char tmp[16], guid_input[16]; | |
200 | struct wmi_block *wblock; | |
201 | struct guid_block *block; | |
202 | struct list_head *p; | |
203 | ||
204 | wmi_parse_guid(guid_string, tmp); | |
205 | wmi_swap_bytes(tmp, guid_input); | |
206 | ||
762e1a2f | 207 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
208 | wblock = list_entry(p, struct wmi_block, list); |
209 | block = &wblock->gblock; | |
210 | ||
211 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
212 | if (out) | |
213 | *out = wblock; | |
097c27fc | 214 | return true; |
bff431e4 CC |
215 | } |
216 | } | |
097c27fc | 217 | return false; |
bff431e4 CC |
218 | } |
219 | ||
a66bfa7a MG |
220 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
221 | { | |
222 | struct guid_block *block = NULL; | |
223 | char method[5]; | |
a66bfa7a MG |
224 | acpi_status status; |
225 | acpi_handle handle; | |
226 | ||
227 | block = &wblock->gblock; | |
228 | handle = wblock->handle; | |
229 | ||
a66bfa7a | 230 | snprintf(method, 5, "WE%02X", block->notify_id); |
8122ab66 | 231 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
232 | |
233 | if (status != AE_OK && status != AE_NOT_FOUND) | |
234 | return status; | |
235 | else | |
236 | return AE_OK; | |
237 | } | |
238 | ||
bff431e4 CC |
239 | /* |
240 | * Exported WMI functions | |
241 | */ | |
242 | /** | |
243 | * wmi_evaluate_method - Evaluate a WMI method | |
244 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
245 | * @instance: Instance index | |
246 | * @method_id: Method ID to call | |
247 | * &in: Buffer containing input for the method call | |
248 | * &out: Empty buffer to return the method results | |
249 | * | |
250 | * Call an ACPI-WMI method | |
251 | */ | |
252 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
253 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
254 | { | |
255 | struct guid_block *block = NULL; | |
256 | struct wmi_block *wblock = NULL; | |
257 | acpi_handle handle; | |
258 | acpi_status status; | |
259 | struct acpi_object_list input; | |
260 | union acpi_object params[3]; | |
f3d83e24 | 261 | char method[5] = "WM"; |
bff431e4 CC |
262 | |
263 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 264 | return AE_ERROR; |
bff431e4 CC |
265 | |
266 | block = &wblock->gblock; | |
267 | handle = wblock->handle; | |
268 | ||
e6bafba5 | 269 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
270 | return AE_BAD_DATA; |
271 | ||
272 | if (block->instance_count < instance) | |
273 | return AE_BAD_PARAMETER; | |
274 | ||
275 | input.count = 2; | |
276 | input.pointer = params; | |
277 | params[0].type = ACPI_TYPE_INTEGER; | |
278 | params[0].integer.value = instance; | |
279 | params[1].type = ACPI_TYPE_INTEGER; | |
280 | params[1].integer.value = method_id; | |
281 | ||
282 | if (in) { | |
283 | input.count = 3; | |
284 | ||
285 | if (block->flags & ACPI_WMI_STRING) { | |
286 | params[2].type = ACPI_TYPE_STRING; | |
287 | } else { | |
288 | params[2].type = ACPI_TYPE_BUFFER; | |
289 | } | |
290 | params[2].buffer.length = in->length; | |
291 | params[2].buffer.pointer = in->pointer; | |
292 | } | |
293 | ||
294 | strncat(method, block->object_id, 2); | |
295 | ||
296 | status = acpi_evaluate_object(handle, method, &input, out); | |
297 | ||
298 | return status; | |
299 | } | |
300 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
301 | ||
302 | /** | |
303 | * wmi_query_block - Return contents of a WMI block | |
304 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
305 | * @instance: Instance index | |
306 | * &out: Empty buffer to return the contents of the data block to | |
307 | * | |
308 | * Return the contents of an ACPI-WMI data block to a buffer | |
309 | */ | |
310 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
311 | struct acpi_buffer *out) | |
312 | { | |
313 | struct guid_block *block = NULL; | |
314 | struct wmi_block *wblock = NULL; | |
54f14c27 | 315 | acpi_handle handle; |
bff431e4 | 316 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
317 | struct acpi_object_list input; |
318 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
319 | char method[5]; |
320 | char wc_method[5] = "WC"; | |
bff431e4 CC |
321 | |
322 | if (!guid_string || !out) | |
323 | return AE_BAD_PARAMETER; | |
324 | ||
325 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 326 | return AE_ERROR; |
bff431e4 CC |
327 | |
328 | block = &wblock->gblock; | |
329 | handle = wblock->handle; | |
330 | ||
331 | if (block->instance_count < instance) | |
332 | return AE_BAD_PARAMETER; | |
333 | ||
334 | /* Check GUID is a data block */ | |
335 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 336 | return AE_ERROR; |
bff431e4 CC |
337 | |
338 | input.count = 1; | |
339 | input.pointer = wq_params; | |
340 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
341 | wq_params[0].integer.value = instance; | |
342 | ||
343 | /* | |
344 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
345 | * enable collection. | |
346 | */ | |
347 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
348 | strncat(wc_method, block->object_id, 2); |
349 | ||
350 | /* | |
351 | * Some GUIDs break the specification by declaring themselves | |
352 | * expensive, but have no corresponding WCxx method. So we | |
353 | * should not fail if this happens. | |
354 | */ | |
54f14c27 | 355 | if (acpi_has_method(handle, wc_method)) |
8122ab66 ZR |
356 | wc_status = acpi_execute_simple_method(handle, |
357 | wc_method, 1); | |
bff431e4 CC |
358 | } |
359 | ||
360 | strcpy(method, "WQ"); | |
361 | strncat(method, block->object_id, 2); | |
362 | ||
dab36ad8 | 363 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
364 | |
365 | /* | |
366 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
367 | * the WQxx method failed - we should disable collection anyway. | |
368 | */ | |
a527f2d7 | 369 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8122ab66 | 370 | status = acpi_execute_simple_method(handle, wc_method, 0); |
bff431e4 CC |
371 | } |
372 | ||
373 | return status; | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
376 | ||
377 | /** | |
378 | * wmi_set_block - Write to a WMI block | |
379 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
380 | * @instance: Instance index | |
381 | * &in: Buffer containing new values for the data block | |
382 | * | |
383 | * Write the contents of the input buffer to an ACPI-WMI data block | |
384 | */ | |
385 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
386 | const struct acpi_buffer *in) | |
387 | { | |
388 | struct guid_block *block = NULL; | |
389 | struct wmi_block *wblock = NULL; | |
390 | acpi_handle handle; | |
391 | struct acpi_object_list input; | |
392 | union acpi_object params[2]; | |
f3d83e24 | 393 | char method[5] = "WS"; |
bff431e4 CC |
394 | |
395 | if (!guid_string || !in) | |
396 | return AE_BAD_DATA; | |
397 | ||
398 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 399 | return AE_ERROR; |
bff431e4 CC |
400 | |
401 | block = &wblock->gblock; | |
402 | handle = wblock->handle; | |
403 | ||
404 | if (block->instance_count < instance) | |
405 | return AE_BAD_PARAMETER; | |
406 | ||
407 | /* Check GUID is a data block */ | |
408 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 409 | return AE_ERROR; |
bff431e4 CC |
410 | |
411 | input.count = 2; | |
412 | input.pointer = params; | |
413 | params[0].type = ACPI_TYPE_INTEGER; | |
414 | params[0].integer.value = instance; | |
415 | ||
416 | if (block->flags & ACPI_WMI_STRING) { | |
417 | params[1].type = ACPI_TYPE_STRING; | |
418 | } else { | |
419 | params[1].type = ACPI_TYPE_BUFFER; | |
420 | } | |
421 | params[1].buffer.length = in->length; | |
422 | params[1].buffer.pointer = in->pointer; | |
423 | ||
424 | strncat(method, block->object_id, 2); | |
425 | ||
426 | return acpi_evaluate_object(handle, method, &input, NULL); | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
429 | ||
37830662 | 430 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 | 431 | { |
85b4e4eb | 432 | pr_info("%pUL:\n", g->guid); |
8e07514d DT |
433 | pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]); |
434 | pr_info("\tnotify_id: %02X\n", g->notify_id); | |
435 | pr_info("\treserved: %02X\n", g->reserved); | |
436 | pr_info("\tinstance_count: %d\n", g->instance_count); | |
dd8e908e | 437 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 438 | if (g->flags) { |
a929aae0 | 439 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 440 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 441 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 442 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 443 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 444 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 445 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 446 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 447 | } |
8e07514d | 448 | pr_cont("\n"); |
a929aae0 TR |
449 | |
450 | } | |
451 | ||
fc3155b2 TR |
452 | static void wmi_notify_debug(u32 value, void *context) |
453 | { | |
454 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
455 | union acpi_object *obj; | |
1492616a | 456 | acpi_status status; |
fc3155b2 | 457 | |
1492616a AL |
458 | status = wmi_get_event_data(value, &response); |
459 | if (status != AE_OK) { | |
8e07514d | 460 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
461 | return; |
462 | } | |
fc3155b2 TR |
463 | |
464 | obj = (union acpi_object *)response.pointer; | |
465 | ||
466 | if (!obj) | |
467 | return; | |
468 | ||
8e07514d | 469 | pr_info("DEBUG Event "); |
fc3155b2 TR |
470 | switch(obj->type) { |
471 | case ACPI_TYPE_BUFFER: | |
8e07514d | 472 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
473 | break; |
474 | case ACPI_TYPE_STRING: | |
8e07514d | 475 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
476 | break; |
477 | case ACPI_TYPE_INTEGER: | |
8e07514d | 478 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
479 | break; |
480 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 481 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
482 | break; |
483 | default: | |
8e07514d | 484 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 485 | } |
1492616a | 486 | kfree(obj); |
fc3155b2 TR |
487 | } |
488 | ||
bff431e4 CC |
489 | /** |
490 | * wmi_install_notify_handler - Register handler for WMI events | |
491 | * @handler: Function to handle notifications | |
492 | * @data: Data to be returned to handler when event is fired | |
493 | * | |
494 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
495 | */ | |
496 | acpi_status wmi_install_notify_handler(const char *guid, | |
497 | wmi_notify_handler handler, void *data) | |
498 | { | |
499 | struct wmi_block *block; | |
58f6425e CK |
500 | acpi_status status = AE_NOT_EXIST; |
501 | char tmp[16], guid_input[16]; | |
502 | struct list_head *p; | |
bff431e4 CC |
503 | |
504 | if (!guid || !handler) | |
505 | return AE_BAD_PARAMETER; | |
506 | ||
58f6425e CK |
507 | wmi_parse_guid(guid, tmp); |
508 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 509 | |
58f6425e CK |
510 | list_for_each(p, &wmi_block_list) { |
511 | acpi_status wmi_status; | |
512 | block = list_entry(p, struct wmi_block, list); | |
513 | ||
514 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
515 | if (block->handler && | |
516 | block->handler != wmi_notify_debug) | |
517 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 518 | |
58f6425e CK |
519 | block->handler = handler; |
520 | block->handler_data = data; | |
bff431e4 | 521 | |
58f6425e CK |
522 | wmi_status = wmi_method_enable(block, 1); |
523 | if ((wmi_status != AE_OK) || | |
524 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
525 | status = wmi_status; | |
526 | } | |
527 | } | |
a66bfa7a MG |
528 | |
529 | return status; | |
bff431e4 CC |
530 | } |
531 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
532 | ||
533 | /** | |
534 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
535 | * | |
536 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
537 | */ | |
538 | acpi_status wmi_remove_notify_handler(const char *guid) | |
539 | { | |
540 | struct wmi_block *block; | |
58f6425e CK |
541 | acpi_status status = AE_NOT_EXIST; |
542 | char tmp[16], guid_input[16]; | |
543 | struct list_head *p; | |
bff431e4 CC |
544 | |
545 | if (!guid) | |
546 | return AE_BAD_PARAMETER; | |
547 | ||
58f6425e CK |
548 | wmi_parse_guid(guid, tmp); |
549 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 550 | |
58f6425e CK |
551 | list_for_each(p, &wmi_block_list) { |
552 | acpi_status wmi_status; | |
553 | block = list_entry(p, struct wmi_block, list); | |
554 | ||
555 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
556 | if (!block->handler || | |
557 | block->handler == wmi_notify_debug) | |
558 | return AE_NULL_ENTRY; | |
559 | ||
560 | if (debug_event) { | |
561 | block->handler = wmi_notify_debug; | |
562 | status = AE_OK; | |
563 | } else { | |
564 | wmi_status = wmi_method_enable(block, 0); | |
565 | block->handler = NULL; | |
566 | block->handler_data = NULL; | |
567 | if ((wmi_status != AE_OK) || | |
568 | ((wmi_status == AE_OK) && | |
569 | (status == AE_NOT_EXIST))) | |
570 | status = wmi_status; | |
571 | } | |
572 | } | |
fc3155b2 | 573 | } |
58f6425e | 574 | |
a66bfa7a | 575 | return status; |
bff431e4 CC |
576 | } |
577 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
578 | ||
579 | /** | |
580 | * wmi_get_event_data - Get WMI data associated with an event | |
581 | * | |
3e9b988e AA |
582 | * @event: Event to find |
583 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
584 | * |
585 | * Returns extra data associated with an event in WMI. | |
586 | */ | |
587 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
588 | { | |
589 | struct acpi_object_list input; | |
590 | union acpi_object params[1]; | |
591 | struct guid_block *gblock; | |
592 | struct wmi_block *wblock; | |
593 | struct list_head *p; | |
594 | ||
595 | input.count = 1; | |
596 | input.pointer = params; | |
597 | params[0].type = ACPI_TYPE_INTEGER; | |
598 | params[0].integer.value = event; | |
599 | ||
762e1a2f | 600 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
601 | wblock = list_entry(p, struct wmi_block, list); |
602 | gblock = &wblock->gblock; | |
603 | ||
604 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
605 | (gblock->notify_id == event)) | |
606 | return acpi_evaluate_object(wblock->handle, "_WED", | |
607 | &input, out); | |
608 | } | |
609 | ||
610 | return AE_NOT_FOUND; | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
613 | ||
614 | /** | |
615 | * wmi_has_guid - Check if a GUID is available | |
616 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
617 | * | |
618 | * Check if a given GUID is defined by _WDG | |
619 | */ | |
620 | bool wmi_has_guid(const char *guid_string) | |
621 | { | |
622 | return find_guid(guid_string, NULL); | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
625 | ||
1caab3c1 MG |
626 | /* |
627 | * sysfs interface | |
628 | */ | |
614ef432 | 629 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
630 | char *buf) |
631 | { | |
1caab3c1 MG |
632 | struct wmi_block *wblock; |
633 | ||
634 | wblock = dev_get_drvdata(dev); | |
a80e1053 PB |
635 | if (!wblock) { |
636 | strcat(buf, "\n"); | |
637 | return strlen(buf); | |
638 | } | |
1caab3c1 | 639 | |
85b4e4eb | 640 | return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid); |
1caab3c1 | 641 | } |
e80b89a5 | 642 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 643 | |
e80b89a5 GKH |
644 | static struct attribute *wmi_attrs[] = { |
645 | &dev_attr_modalias.attr, | |
646 | NULL, | |
614ef432 | 647 | }; |
e80b89a5 | 648 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 MG |
649 | |
650 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
651 | { | |
652 | char guid_string[37]; | |
653 | ||
654 | struct wmi_block *wblock; | |
655 | ||
656 | if (add_uevent_var(env, "MODALIAS=")) | |
657 | return -ENOMEM; | |
658 | ||
659 | wblock = dev_get_drvdata(dev); | |
660 | if (!wblock) | |
661 | return -ENOMEM; | |
662 | ||
85b4e4eb | 663 | sprintf(guid_string, "%pUL", wblock->gblock.guid); |
1caab3c1 MG |
664 | |
665 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
666 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
667 | env->buflen += 40; | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | static void wmi_dev_free(struct device *dev) | |
673 | { | |
c64eefd4 DT |
674 | struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev); |
675 | ||
676 | kfree(wmi_block); | |
1caab3c1 MG |
677 | } |
678 | ||
679 | static struct class wmi_class = { | |
680 | .name = "wmi", | |
681 | .dev_release = wmi_dev_free, | |
682 | .dev_uevent = wmi_dev_uevent, | |
e80b89a5 | 683 | .dev_groups = wmi_groups, |
1caab3c1 MG |
684 | }; |
685 | ||
58f6425e CK |
686 | static int wmi_create_device(const struct guid_block *gblock, |
687 | struct wmi_block *wblock, acpi_handle handle) | |
1caab3c1 | 688 | { |
c64eefd4 | 689 | wblock->dev.class = &wmi_class; |
1caab3c1 | 690 | |
85b4e4eb | 691 | dev_set_name(&wblock->dev, "%pUL", gblock->guid); |
1caab3c1 | 692 | |
c64eefd4 | 693 | dev_set_drvdata(&wblock->dev, wblock); |
1caab3c1 | 694 | |
58f6425e | 695 | return device_register(&wblock->dev); |
1caab3c1 MG |
696 | } |
697 | ||
c64eefd4 | 698 | static void wmi_free_devices(void) |
1caab3c1 | 699 | { |
c64eefd4 | 700 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
701 | |
702 | /* Delete devices for all the GUIDs */ | |
023b9565 DT |
703 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
704 | list_del(&wblock->list); | |
58f6425e CK |
705 | if (wblock->dev.class) |
706 | device_unregister(&wblock->dev); | |
023b9565 DT |
707 | else |
708 | kfree(wblock); | |
709 | } | |
1caab3c1 MG |
710 | } |
711 | ||
d1f9e497 CC |
712 | static bool guid_already_parsed(const char *guid_string) |
713 | { | |
d1f9e497 | 714 | struct wmi_block *wblock; |
d1f9e497 | 715 | |
c64eefd4 | 716 | list_for_each_entry(wblock, &wmi_block_list, list) |
8b14d7b2 | 717 | if (memcmp(wblock->gblock.guid, guid_string, 16) == 0) |
d1f9e497 | 718 | return true; |
d1f9e497 | 719 | |
c64eefd4 | 720 | return false; |
2d5ab555 DT |
721 | } |
722 | ||
bff431e4 CC |
723 | /* |
724 | * Parse the _WDG method for the GUID data blocks | |
725 | */ | |
0a018a68 | 726 | static int parse_wdg(acpi_handle handle) |
bff431e4 CC |
727 | { |
728 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
729 | union acpi_object *obj; | |
37830662 | 730 | const struct guid_block *gblock; |
bff431e4 CC |
731 | struct wmi_block *wblock; |
732 | acpi_status status; | |
c64eefd4 | 733 | int retval; |
bff431e4 CC |
734 | u32 i, total; |
735 | ||
736 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
bff431e4 | 737 | if (ACPI_FAILURE(status)) |
c64eefd4 | 738 | return -ENXIO; |
bff431e4 CC |
739 | |
740 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 741 | if (!obj) |
c64eefd4 | 742 | return -ENXIO; |
bff431e4 | 743 | |
64ed0ab8 | 744 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 745 | retval = -ENXIO; |
64ed0ab8 DT |
746 | goto out_free_pointer; |
747 | } | |
bff431e4 | 748 | |
37830662 | 749 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
750 | total = obj->buffer.length / sizeof(struct guid_block); |
751 | ||
bff431e4 | 752 | for (i = 0; i < total; i++) { |
58f6425e CK |
753 | if (debug_dump_wdg) |
754 | wmi_dump_wdg(&gblock[i]); | |
755 | ||
756 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
757 | if (!wblock) | |
0a018a68 | 758 | return -ENOMEM; |
58f6425e CK |
759 | |
760 | wblock->handle = handle; | |
761 | wblock->gblock = gblock[i]; | |
762 | ||
d1f9e497 CC |
763 | /* |
764 | Some WMI devices, like those for nVidia hooks, have a | |
765 | duplicate GUID. It's not clear what we should do in this | |
58f6425e CK |
766 | case yet, so for now, we'll just ignore the duplicate |
767 | for device creation. | |
d1f9e497 | 768 | */ |
58f6425e CK |
769 | if (!guid_already_parsed(gblock[i].guid)) { |
770 | retval = wmi_create_device(&gblock[i], wblock, handle); | |
771 | if (retval) { | |
772 | wmi_free_devices(); | |
e1e0dacb | 773 | goto out_free_pointer; |
58f6425e | 774 | } |
d1f9e497 | 775 | } |
c64eefd4 | 776 | |
58f6425e | 777 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 778 | |
fc3155b2 TR |
779 | if (debug_event) { |
780 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 781 | wmi_method_enable(wblock, 1); |
fc3155b2 | 782 | } |
bff431e4 CC |
783 | } |
784 | ||
c64eefd4 DT |
785 | retval = 0; |
786 | ||
a5167c5b AL |
787 | out_free_pointer: |
788 | kfree(out.pointer); | |
bff431e4 | 789 | |
c64eefd4 | 790 | return retval; |
bff431e4 CC |
791 | } |
792 | ||
793 | /* | |
794 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
795 | * hand these off to the EC driver. | |
796 | */ | |
797 | static acpi_status | |
798 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 799 | u32 bits, u64 *value, |
bff431e4 CC |
800 | void *handler_context, void *region_context) |
801 | { | |
802 | int result = 0, i = 0; | |
803 | u8 temp = 0; | |
804 | ||
805 | if ((address > 0xFF) || !value) | |
806 | return AE_BAD_PARAMETER; | |
807 | ||
808 | if (function != ACPI_READ && function != ACPI_WRITE) | |
809 | return AE_BAD_PARAMETER; | |
810 | ||
811 | if (bits != 8) | |
812 | return AE_BAD_PARAMETER; | |
813 | ||
814 | if (function == ACPI_READ) { | |
815 | result = ec_read(address, &temp); | |
439913ff | 816 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
817 | } else { |
818 | temp = 0xff & ((*value) >> i); | |
819 | result = ec_write(address, temp); | |
820 | } | |
821 | ||
822 | switch (result) { | |
823 | case -EINVAL: | |
824 | return AE_BAD_PARAMETER; | |
825 | break; | |
826 | case -ENODEV: | |
827 | return AE_NOT_FOUND; | |
828 | break; | |
829 | case -ETIME: | |
830 | return AE_TIME; | |
831 | break; | |
832 | default: | |
833 | return AE_OK; | |
834 | } | |
835 | } | |
836 | ||
f61bb939 | 837 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
838 | { |
839 | struct guid_block *block; | |
840 | struct wmi_block *wblock; | |
841 | struct list_head *p; | |
bff431e4 | 842 | |
762e1a2f | 843 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
844 | wblock = list_entry(p, struct wmi_block, list); |
845 | block = &wblock->gblock; | |
846 | ||
847 | if ((block->flags & ACPI_WMI_EVENT) && | |
848 | (block->notify_id == event)) { | |
849 | if (wblock->handler) | |
850 | wblock->handler(event, wblock->handler_data); | |
7715348c | 851 | if (debug_event) { |
85b4e4eb RV |
852 | pr_info("DEBUG Event GUID: %pUL\n", |
853 | wblock->gblock.guid); | |
7715348c | 854 | } |
bff431e4 CC |
855 | |
856 | acpi_bus_generate_netlink_event( | |
0794469d | 857 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
858 | event, 0); |
859 | break; | |
860 | } | |
861 | } | |
862 | } | |
863 | ||
51fac838 | 864 | static int acpi_wmi_remove(struct acpi_device *device) |
bff431e4 | 865 | { |
bff431e4 CC |
866 | acpi_remove_address_space_handler(device->handle, |
867 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
c64eefd4 | 868 | wmi_free_devices(); |
bff431e4 CC |
869 | |
870 | return 0; | |
871 | } | |
872 | ||
925b1089 | 873 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
874 | { |
875 | acpi_status status; | |
c64eefd4 | 876 | int error; |
bff431e4 | 877 | |
bff431e4 CC |
878 | status = acpi_install_address_space_handler(device->handle, |
879 | ACPI_ADR_SPACE_EC, | |
880 | &acpi_wmi_ec_space_handler, | |
881 | NULL, NULL); | |
5212cd67 | 882 | if (ACPI_FAILURE(status)) { |
8e07514d | 883 | pr_err("Error installing EC region handler\n"); |
bff431e4 | 884 | return -ENODEV; |
5212cd67 | 885 | } |
bff431e4 | 886 | |
c64eefd4 DT |
887 | error = parse_wdg(device->handle); |
888 | if (error) { | |
5212cd67 DT |
889 | acpi_remove_address_space_handler(device->handle, |
890 | ACPI_ADR_SPACE_EC, | |
891 | &acpi_wmi_ec_space_handler); | |
8e07514d | 892 | pr_err("Failed to parse WDG method\n"); |
c64eefd4 | 893 | return error; |
bff431e4 CC |
894 | } |
895 | ||
c64eefd4 | 896 | return 0; |
bff431e4 CC |
897 | } |
898 | ||
899 | static int __init acpi_wmi_init(void) | |
900 | { | |
c64eefd4 | 901 | int error; |
bff431e4 CC |
902 | |
903 | if (acpi_disabled) | |
904 | return -ENODEV; | |
905 | ||
c64eefd4 DT |
906 | error = class_register(&wmi_class); |
907 | if (error) | |
908 | return error; | |
1caab3c1 | 909 | |
c64eefd4 DT |
910 | error = acpi_bus_register_driver(&acpi_wmi_driver); |
911 | if (error) { | |
912 | pr_err("Error loading mapper\n"); | |
913 | class_unregister(&wmi_class); | |
914 | return error; | |
bff431e4 CC |
915 | } |
916 | ||
8e07514d | 917 | pr_info("Mapper loaded\n"); |
8e07514d | 918 | return 0; |
bff431e4 CC |
919 | } |
920 | ||
921 | static void __exit acpi_wmi_exit(void) | |
922 | { | |
bff431e4 | 923 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
c64eefd4 | 924 | class_unregister(&wmi_class); |
bff431e4 | 925 | |
8e07514d | 926 | pr_info("Mapper unloaded\n"); |
bff431e4 CC |
927 | } |
928 | ||
929 | subsys_initcall(acpi_wmi_init); | |
930 | module_exit(acpi_wmi_exit); |