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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> |
bff431e4 CC |
39 | #include <acpi/acpi_bus.h> |
40 | #include <acpi/acpi_drivers.h> | |
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 | ||
bff431e4 | 49 | static DEFINE_MUTEX(wmi_data_lock); |
762e1a2f | 50 | static LIST_HEAD(wmi_block_list); |
bff431e4 CC |
51 | |
52 | struct guid_block { | |
53 | char guid[16]; | |
54 | union { | |
55 | char object_id[2]; | |
56 | struct { | |
57 | unsigned char notify_id; | |
58 | unsigned char reserved; | |
59 | }; | |
60 | }; | |
61 | u8 instance_count; | |
62 | u8 flags; | |
63 | }; | |
64 | ||
65 | struct wmi_block { | |
66 | struct list_head list; | |
67 | struct guid_block gblock; | |
68 | acpi_handle handle; | |
69 | wmi_notify_handler handler; | |
70 | void *handler_data; | |
c64eefd4 | 71 | struct device dev; |
bff431e4 CC |
72 | }; |
73 | ||
bff431e4 CC |
74 | |
75 | /* | |
76 | * If the GUID data block is marked as expensive, we must enable and | |
77 | * explicitily disable data collection. | |
78 | */ | |
79 | #define ACPI_WMI_EXPENSIVE 0x1 | |
80 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
81 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
82 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
83 | ||
fc3155b2 TR |
84 | static int debug_event; |
85 | module_param(debug_event, bool, 0444); | |
86 | MODULE_PARM_DESC(debug_event, | |
87 | "Log WMI Events [0/1]"); | |
88 | ||
a929aae0 TR |
89 | static int debug_dump_wdg; |
90 | module_param(debug_dump_wdg, bool, 0444); | |
91 | MODULE_PARM_DESC(debug_dump_wdg, | |
92 | "Dump available WMI interfaces [0/1]"); | |
93 | ||
bff431e4 CC |
94 | static int acpi_wmi_remove(struct acpi_device *device, int type); |
95 | static int acpi_wmi_add(struct acpi_device *device); | |
f61bb939 | 96 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
97 | |
98 | static const struct acpi_device_id wmi_device_ids[] = { | |
99 | {"PNP0C14", 0}, | |
100 | {"pnp0c14", 0}, | |
101 | {"", 0}, | |
102 | }; | |
103 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
104 | ||
105 | static struct acpi_driver acpi_wmi_driver = { | |
106 | .name = "wmi", | |
107 | .class = ACPI_WMI_CLASS, | |
108 | .ids = wmi_device_ids, | |
109 | .ops = { | |
110 | .add = acpi_wmi_add, | |
111 | .remove = acpi_wmi_remove, | |
f61bb939 | 112 | .notify = acpi_wmi_notify, |
c64eefd4 | 113 | }, |
bff431e4 CC |
114 | }; |
115 | ||
116 | /* | |
117 | * GUID parsing functions | |
118 | */ | |
119 | ||
120 | /** | |
121 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
122 | * @src: Pointer to at least 2 characters to convert. | |
123 | * | |
124 | * Convert a two character ASCII hex string to a number. | |
125 | * | |
126 | * Return: 0-255 Success, the byte was parsed correctly | |
127 | * -1 Error, an invalid character was supplied | |
128 | */ | |
129 | static int wmi_parse_hexbyte(const u8 *src) | |
130 | { | |
bff431e4 | 131 | int h; |
392bd8b5 | 132 | int value; |
bff431e4 CC |
133 | |
134 | /* high part */ | |
392bd8b5 AS |
135 | h = value = hex_to_bin(src[0]); |
136 | if (value < 0) | |
bff431e4 | 137 | return -1; |
bff431e4 CC |
138 | |
139 | /* low part */ | |
392bd8b5 AS |
140 | value = hex_to_bin(src[1]); |
141 | if (value >= 0) | |
142 | return (h << 4) | value; | |
bff431e4 CC |
143 | return -1; |
144 | } | |
145 | ||
146 | /** | |
147 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
148 | * @src: Memory block holding binary GUID (16 bytes) | |
149 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
150 | * | |
151 | * Byte swap a binary GUID to match it's real GUID value | |
152 | */ | |
153 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
154 | { | |
155 | int i; | |
156 | ||
157 | for (i = 0; i <= 3; i++) | |
158 | memcpy(dest + i, src + (3 - i), 1); | |
159 | ||
160 | for (i = 0; i <= 1; i++) | |
161 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
162 | ||
163 | for (i = 0; i <= 1; i++) | |
164 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
165 | ||
166 | memcpy(dest + 8, src + 8, 8); | |
167 | } | |
168 | ||
169 | /** | |
170 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
171 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
172 | * @dest: Memory block to hold binary GUID (16 bytes) | |
173 | * | |
174 | * N.B. The GUID need not be NULL terminated. | |
175 | * | |
176 | * Return: 'true' @dest contains binary GUID | |
177 | * 'false' @dest contents are undefined | |
178 | */ | |
179 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
180 | { | |
181 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
182 | int i, j, v; | |
183 | ||
184 | if (src[8] != '-' || src[13] != '-' || | |
185 | src[18] != '-' || src[23] != '-') | |
186 | return false; | |
187 | ||
188 | for (j = 0; j < 5; j++, src++) { | |
189 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
190 | v = wmi_parse_hexbyte(src); | |
191 | if (v < 0) | |
192 | return false; | |
193 | } | |
194 | } | |
195 | ||
196 | return true; | |
197 | } | |
198 | ||
1caab3c1 MG |
199 | /* |
200 | * Convert a raw GUID to the ACII string representation | |
201 | */ | |
202 | static int wmi_gtoa(const char *in, char *out) | |
203 | { | |
204 | int i; | |
205 | ||
206 | for (i = 3; i >= 0; i--) | |
207 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
208 | ||
209 | out += sprintf(out, "-"); | |
210 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
211 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
212 | out += sprintf(out, "-"); | |
213 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
214 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
215 | out += sprintf(out, "-"); | |
216 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
217 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
218 | out += sprintf(out, "-"); | |
219 | ||
220 | for (i = 10; i <= 15; i++) | |
221 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
222 | ||
4e4304d7 | 223 | *out = '\0'; |
1caab3c1 MG |
224 | return 0; |
225 | } | |
226 | ||
bff431e4 CC |
227 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
228 | { | |
229 | char tmp[16], guid_input[16]; | |
230 | struct wmi_block *wblock; | |
231 | struct guid_block *block; | |
232 | struct list_head *p; | |
233 | ||
234 | wmi_parse_guid(guid_string, tmp); | |
235 | wmi_swap_bytes(tmp, guid_input); | |
236 | ||
762e1a2f | 237 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
238 | wblock = list_entry(p, struct wmi_block, list); |
239 | block = &wblock->gblock; | |
240 | ||
241 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
242 | if (out) | |
243 | *out = wblock; | |
244 | return 1; | |
245 | } | |
246 | } | |
247 | return 0; | |
248 | } | |
249 | ||
a66bfa7a MG |
250 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
251 | { | |
252 | struct guid_block *block = NULL; | |
253 | char method[5]; | |
254 | struct acpi_object_list input; | |
255 | union acpi_object params[1]; | |
256 | acpi_status status; | |
257 | acpi_handle handle; | |
258 | ||
259 | block = &wblock->gblock; | |
260 | handle = wblock->handle; | |
261 | ||
262 | if (!block) | |
263 | return AE_NOT_EXIST; | |
264 | ||
265 | input.count = 1; | |
266 | input.pointer = params; | |
267 | params[0].type = ACPI_TYPE_INTEGER; | |
268 | params[0].integer.value = enable; | |
269 | ||
270 | snprintf(method, 5, "WE%02X", block->notify_id); | |
271 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
272 | ||
273 | if (status != AE_OK && status != AE_NOT_FOUND) | |
274 | return status; | |
275 | else | |
276 | return AE_OK; | |
277 | } | |
278 | ||
bff431e4 CC |
279 | /* |
280 | * Exported WMI functions | |
281 | */ | |
282 | /** | |
283 | * wmi_evaluate_method - Evaluate a WMI method | |
284 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
285 | * @instance: Instance index | |
286 | * @method_id: Method ID to call | |
287 | * &in: Buffer containing input for the method call | |
288 | * &out: Empty buffer to return the method results | |
289 | * | |
290 | * Call an ACPI-WMI method | |
291 | */ | |
292 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
293 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
294 | { | |
295 | struct guid_block *block = NULL; | |
296 | struct wmi_block *wblock = NULL; | |
297 | acpi_handle handle; | |
298 | acpi_status status; | |
299 | struct acpi_object_list input; | |
300 | union acpi_object params[3]; | |
f3d83e24 | 301 | char method[5] = "WM"; |
bff431e4 CC |
302 | |
303 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 304 | return AE_ERROR; |
bff431e4 CC |
305 | |
306 | block = &wblock->gblock; | |
307 | handle = wblock->handle; | |
308 | ||
e6bafba5 | 309 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
310 | return AE_BAD_DATA; |
311 | ||
312 | if (block->instance_count < instance) | |
313 | return AE_BAD_PARAMETER; | |
314 | ||
315 | input.count = 2; | |
316 | input.pointer = params; | |
317 | params[0].type = ACPI_TYPE_INTEGER; | |
318 | params[0].integer.value = instance; | |
319 | params[1].type = ACPI_TYPE_INTEGER; | |
320 | params[1].integer.value = method_id; | |
321 | ||
322 | if (in) { | |
323 | input.count = 3; | |
324 | ||
325 | if (block->flags & ACPI_WMI_STRING) { | |
326 | params[2].type = ACPI_TYPE_STRING; | |
327 | } else { | |
328 | params[2].type = ACPI_TYPE_BUFFER; | |
329 | } | |
330 | params[2].buffer.length = in->length; | |
331 | params[2].buffer.pointer = in->pointer; | |
332 | } | |
333 | ||
334 | strncat(method, block->object_id, 2); | |
335 | ||
336 | status = acpi_evaluate_object(handle, method, &input, out); | |
337 | ||
338 | return status; | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
341 | ||
342 | /** | |
343 | * wmi_query_block - Return contents of a WMI block | |
344 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
345 | * @instance: Instance index | |
346 | * &out: Empty buffer to return the contents of the data block to | |
347 | * | |
348 | * Return the contents of an ACPI-WMI data block to a buffer | |
349 | */ | |
350 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
351 | struct acpi_buffer *out) | |
352 | { | |
353 | struct guid_block *block = NULL; | |
354 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 355 | acpi_handle handle, wc_handle; |
bff431e4 CC |
356 | acpi_status status, wc_status = AE_ERROR; |
357 | struct acpi_object_list input, wc_input; | |
358 | union acpi_object wc_params[1], wq_params[1]; | |
f3d83e24 CL |
359 | char method[5]; |
360 | char wc_method[5] = "WC"; | |
bff431e4 CC |
361 | |
362 | if (!guid_string || !out) | |
363 | return AE_BAD_PARAMETER; | |
364 | ||
365 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 366 | return AE_ERROR; |
bff431e4 CC |
367 | |
368 | block = &wblock->gblock; | |
369 | handle = wblock->handle; | |
370 | ||
371 | if (block->instance_count < instance) | |
372 | return AE_BAD_PARAMETER; | |
373 | ||
374 | /* Check GUID is a data block */ | |
375 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 376 | return AE_ERROR; |
bff431e4 CC |
377 | |
378 | input.count = 1; | |
379 | input.pointer = wq_params; | |
380 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
381 | wq_params[0].integer.value = instance; | |
382 | ||
383 | /* | |
384 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
385 | * enable collection. | |
386 | */ | |
387 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
388 | wc_input.count = 1; | |
389 | wc_input.pointer = wc_params; | |
390 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
391 | wc_params[0].integer.value = 1; | |
392 | ||
393 | strncat(wc_method, block->object_id, 2); | |
394 | ||
395 | /* | |
396 | * Some GUIDs break the specification by declaring themselves | |
397 | * expensive, but have no corresponding WCxx method. So we | |
398 | * should not fail if this happens. | |
399 | */ | |
a527f2d7 CC |
400 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
401 | if (ACPI_SUCCESS(wc_status)) | |
402 | wc_status = acpi_evaluate_object(handle, wc_method, | |
403 | &wc_input, NULL); | |
bff431e4 CC |
404 | } |
405 | ||
406 | strcpy(method, "WQ"); | |
407 | strncat(method, block->object_id, 2); | |
408 | ||
dab36ad8 | 409 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
410 | |
411 | /* | |
412 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
413 | * the WQxx method failed - we should disable collection anyway. | |
414 | */ | |
a527f2d7 | 415 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
416 | wc_params[0].integer.value = 0; |
417 | status = acpi_evaluate_object(handle, | |
418 | wc_method, &wc_input, NULL); | |
419 | } | |
420 | ||
421 | return status; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
424 | ||
425 | /** | |
426 | * wmi_set_block - Write to a WMI block | |
427 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
428 | * @instance: Instance index | |
429 | * &in: Buffer containing new values for the data block | |
430 | * | |
431 | * Write the contents of the input buffer to an ACPI-WMI data block | |
432 | */ | |
433 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
434 | const struct acpi_buffer *in) | |
435 | { | |
436 | struct guid_block *block = NULL; | |
437 | struct wmi_block *wblock = NULL; | |
438 | acpi_handle handle; | |
439 | struct acpi_object_list input; | |
440 | union acpi_object params[2]; | |
f3d83e24 | 441 | char method[5] = "WS"; |
bff431e4 CC |
442 | |
443 | if (!guid_string || !in) | |
444 | return AE_BAD_DATA; | |
445 | ||
446 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 447 | return AE_ERROR; |
bff431e4 CC |
448 | |
449 | block = &wblock->gblock; | |
450 | handle = wblock->handle; | |
451 | ||
452 | if (block->instance_count < instance) | |
453 | return AE_BAD_PARAMETER; | |
454 | ||
455 | /* Check GUID is a data block */ | |
456 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 457 | return AE_ERROR; |
bff431e4 CC |
458 | |
459 | input.count = 2; | |
460 | input.pointer = params; | |
461 | params[0].type = ACPI_TYPE_INTEGER; | |
462 | params[0].integer.value = instance; | |
463 | ||
464 | if (block->flags & ACPI_WMI_STRING) { | |
465 | params[1].type = ACPI_TYPE_STRING; | |
466 | } else { | |
467 | params[1].type = ACPI_TYPE_BUFFER; | |
468 | } | |
469 | params[1].buffer.length = in->length; | |
470 | params[1].buffer.pointer = in->pointer; | |
471 | ||
472 | strncat(method, block->object_id, 2); | |
473 | ||
474 | return acpi_evaluate_object(handle, method, &input, NULL); | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
477 | ||
37830662 | 478 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 TR |
479 | { |
480 | char guid_string[37]; | |
481 | ||
482 | wmi_gtoa(g->guid, guid_string); | |
8e07514d DT |
483 | |
484 | pr_info("%s:\n", guid_string); | |
485 | pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]); | |
486 | pr_info("\tnotify_id: %02X\n", g->notify_id); | |
487 | pr_info("\treserved: %02X\n", g->reserved); | |
488 | pr_info("\tinstance_count: %d\n", g->instance_count); | |
489 | pr_info("\tflags: %#x ", g->flags); | |
a929aae0 | 490 | if (g->flags) { |
a929aae0 | 491 | if (g->flags & ACPI_WMI_EXPENSIVE) |
8e07514d | 492 | pr_cont("ACPI_WMI_EXPENSIVE "); |
a929aae0 | 493 | if (g->flags & ACPI_WMI_METHOD) |
8e07514d | 494 | pr_cont("ACPI_WMI_METHOD "); |
a929aae0 | 495 | if (g->flags & ACPI_WMI_STRING) |
8e07514d | 496 | pr_cont("ACPI_WMI_STRING "); |
a929aae0 | 497 | if (g->flags & ACPI_WMI_EVENT) |
8e07514d | 498 | pr_cont("ACPI_WMI_EVENT "); |
a929aae0 | 499 | } |
8e07514d | 500 | pr_cont("\n"); |
a929aae0 TR |
501 | |
502 | } | |
503 | ||
fc3155b2 TR |
504 | static void wmi_notify_debug(u32 value, void *context) |
505 | { | |
506 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
507 | union acpi_object *obj; | |
1492616a | 508 | acpi_status status; |
fc3155b2 | 509 | |
1492616a AL |
510 | status = wmi_get_event_data(value, &response); |
511 | if (status != AE_OK) { | |
8e07514d | 512 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
513 | return; |
514 | } | |
fc3155b2 TR |
515 | |
516 | obj = (union acpi_object *)response.pointer; | |
517 | ||
518 | if (!obj) | |
519 | return; | |
520 | ||
8e07514d | 521 | pr_info("DEBUG Event "); |
fc3155b2 TR |
522 | switch(obj->type) { |
523 | case ACPI_TYPE_BUFFER: | |
8e07514d | 524 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
525 | break; |
526 | case ACPI_TYPE_STRING: | |
8e07514d | 527 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
528 | break; |
529 | case ACPI_TYPE_INTEGER: | |
8e07514d | 530 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
531 | break; |
532 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 533 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
534 | break; |
535 | default: | |
8e07514d | 536 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 537 | } |
1492616a | 538 | kfree(obj); |
fc3155b2 TR |
539 | } |
540 | ||
bff431e4 CC |
541 | /** |
542 | * wmi_install_notify_handler - Register handler for WMI events | |
543 | * @handler: Function to handle notifications | |
544 | * @data: Data to be returned to handler when event is fired | |
545 | * | |
546 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
547 | */ | |
548 | acpi_status wmi_install_notify_handler(const char *guid, | |
549 | wmi_notify_handler handler, void *data) | |
550 | { | |
551 | struct wmi_block *block; | |
a66bfa7a | 552 | acpi_status status; |
bff431e4 CC |
553 | |
554 | if (!guid || !handler) | |
555 | return AE_BAD_PARAMETER; | |
556 | ||
c03b26a5 | 557 | if (!find_guid(guid, &block)) |
bff431e4 CC |
558 | return AE_NOT_EXIST; |
559 | ||
fc3155b2 | 560 | if (block->handler && block->handler != wmi_notify_debug) |
bff431e4 CC |
561 | return AE_ALREADY_ACQUIRED; |
562 | ||
563 | block->handler = handler; | |
564 | block->handler_data = data; | |
565 | ||
a66bfa7a MG |
566 | status = wmi_method_enable(block, 1); |
567 | ||
568 | return status; | |
bff431e4 CC |
569 | } |
570 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
571 | ||
572 | /** | |
573 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
574 | * | |
575 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
576 | */ | |
577 | acpi_status wmi_remove_notify_handler(const char *guid) | |
578 | { | |
579 | struct wmi_block *block; | |
fc3155b2 | 580 | acpi_status status = AE_OK; |
bff431e4 CC |
581 | |
582 | if (!guid) | |
583 | return AE_BAD_PARAMETER; | |
584 | ||
c03b26a5 | 585 | if (!find_guid(guid, &block)) |
bff431e4 CC |
586 | return AE_NOT_EXIST; |
587 | ||
fc3155b2 | 588 | if (!block->handler || block->handler == wmi_notify_debug) |
bff431e4 CC |
589 | return AE_NULL_ENTRY; |
590 | ||
fc3155b2 TR |
591 | if (debug_event) { |
592 | block->handler = wmi_notify_debug; | |
593 | } else { | |
594 | status = wmi_method_enable(block, 0); | |
595 | block->handler = NULL; | |
596 | block->handler_data = NULL; | |
597 | } | |
a66bfa7a | 598 | return status; |
bff431e4 CC |
599 | } |
600 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
601 | ||
602 | /** | |
603 | * wmi_get_event_data - Get WMI data associated with an event | |
604 | * | |
3e9b988e AA |
605 | * @event: Event to find |
606 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
607 | * |
608 | * Returns extra data associated with an event in WMI. | |
609 | */ | |
610 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
611 | { | |
612 | struct acpi_object_list input; | |
613 | union acpi_object params[1]; | |
614 | struct guid_block *gblock; | |
615 | struct wmi_block *wblock; | |
616 | struct list_head *p; | |
617 | ||
618 | input.count = 1; | |
619 | input.pointer = params; | |
620 | params[0].type = ACPI_TYPE_INTEGER; | |
621 | params[0].integer.value = event; | |
622 | ||
762e1a2f | 623 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
624 | wblock = list_entry(p, struct wmi_block, list); |
625 | gblock = &wblock->gblock; | |
626 | ||
627 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
628 | (gblock->notify_id == event)) | |
629 | return acpi_evaluate_object(wblock->handle, "_WED", | |
630 | &input, out); | |
631 | } | |
632 | ||
633 | return AE_NOT_FOUND; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
636 | ||
637 | /** | |
638 | * wmi_has_guid - Check if a GUID is available | |
639 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
640 | * | |
641 | * Check if a given GUID is defined by _WDG | |
642 | */ | |
643 | bool wmi_has_guid(const char *guid_string) | |
644 | { | |
645 | return find_guid(guid_string, NULL); | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
648 | ||
1caab3c1 MG |
649 | /* |
650 | * sysfs interface | |
651 | */ | |
614ef432 | 652 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
653 | char *buf) |
654 | { | |
655 | char guid_string[37]; | |
656 | struct wmi_block *wblock; | |
657 | ||
658 | wblock = dev_get_drvdata(dev); | |
659 | if (!wblock) | |
660 | return -ENOMEM; | |
661 | ||
662 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
663 | ||
664 | return sprintf(buf, "wmi:%s\n", guid_string); | |
665 | } | |
614ef432 DT |
666 | |
667 | static struct device_attribute wmi_dev_attrs[] = { | |
668 | __ATTR_RO(modalias), | |
669 | __ATTR_NULL | |
670 | }; | |
1caab3c1 MG |
671 | |
672 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
673 | { | |
674 | char guid_string[37]; | |
675 | ||
676 | struct wmi_block *wblock; | |
677 | ||
678 | if (add_uevent_var(env, "MODALIAS=")) | |
679 | return -ENOMEM; | |
680 | ||
681 | wblock = dev_get_drvdata(dev); | |
682 | if (!wblock) | |
683 | return -ENOMEM; | |
684 | ||
685 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
686 | ||
687 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
688 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
689 | env->buflen += 40; | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static void wmi_dev_free(struct device *dev) | |
695 | { | |
c64eefd4 DT |
696 | struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev); |
697 | ||
698 | kfree(wmi_block); | |
1caab3c1 MG |
699 | } |
700 | ||
701 | static struct class wmi_class = { | |
702 | .name = "wmi", | |
703 | .dev_release = wmi_dev_free, | |
704 | .dev_uevent = wmi_dev_uevent, | |
614ef432 | 705 | .dev_attrs = wmi_dev_attrs, |
1caab3c1 MG |
706 | }; |
707 | ||
c64eefd4 DT |
708 | static struct wmi_block *wmi_create_device(const struct guid_block *gblock, |
709 | acpi_handle handle) | |
1caab3c1 | 710 | { |
1caab3c1 | 711 | struct wmi_block *wblock; |
c64eefd4 DT |
712 | int error; |
713 | char guid_string[37]; | |
1caab3c1 | 714 | |
c64eefd4 DT |
715 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
716 | if (!wblock) { | |
717 | error = -ENOMEM; | |
718 | goto err_out; | |
719 | } | |
1caab3c1 | 720 | |
c64eefd4 DT |
721 | wblock->handle = handle; |
722 | wblock->gblock = *gblock; | |
1caab3c1 | 723 | |
c64eefd4 | 724 | wblock->dev.class = &wmi_class; |
1caab3c1 | 725 | |
c64eefd4 DT |
726 | wmi_gtoa(gblock->guid, guid_string); |
727 | dev_set_name(&wblock->dev, guid_string); | |
1caab3c1 | 728 | |
c64eefd4 | 729 | dev_set_drvdata(&wblock->dev, wblock); |
1caab3c1 | 730 | |
c64eefd4 DT |
731 | error = device_register(&wblock->dev); |
732 | if (error) | |
733 | goto err_free; | |
1caab3c1 | 734 | |
c64eefd4 DT |
735 | list_add_tail(&wblock->list, &wmi_block_list); |
736 | return wblock; | |
1caab3c1 | 737 | |
c64eefd4 DT |
738 | err_free: |
739 | kfree(wblock); | |
740 | err_out: | |
741 | return ERR_PTR(error); | |
1caab3c1 MG |
742 | } |
743 | ||
c64eefd4 | 744 | static void wmi_free_devices(void) |
1caab3c1 | 745 | { |
c64eefd4 | 746 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
747 | |
748 | /* Delete devices for all the GUIDs */ | |
c64eefd4 DT |
749 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) |
750 | device_unregister(&wblock->dev); | |
1caab3c1 MG |
751 | } |
752 | ||
d1f9e497 CC |
753 | static bool guid_already_parsed(const char *guid_string) |
754 | { | |
d1f9e497 | 755 | struct wmi_block *wblock; |
d1f9e497 | 756 | |
c64eefd4 | 757 | list_for_each_entry(wblock, &wmi_block_list, list) |
8b14d7b2 | 758 | if (memcmp(wblock->gblock.guid, guid_string, 16) == 0) |
d1f9e497 | 759 | return true; |
d1f9e497 | 760 | |
c64eefd4 | 761 | return false; |
2d5ab555 DT |
762 | } |
763 | ||
bff431e4 CC |
764 | /* |
765 | * Parse the _WDG method for the GUID data blocks | |
766 | */ | |
925b1089 | 767 | static acpi_status parse_wdg(acpi_handle handle) |
bff431e4 CC |
768 | { |
769 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
770 | union acpi_object *obj; | |
37830662 | 771 | const struct guid_block *gblock; |
bff431e4 | 772 | struct wmi_block *wblock; |
d1f9e497 | 773 | char guid_string[37]; |
bff431e4 | 774 | acpi_status status; |
c64eefd4 | 775 | int retval; |
bff431e4 CC |
776 | u32 i, total; |
777 | ||
778 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
bff431e4 | 779 | if (ACPI_FAILURE(status)) |
c64eefd4 | 780 | return -ENXIO; |
bff431e4 CC |
781 | |
782 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 783 | if (!obj) |
c64eefd4 | 784 | return -ENXIO; |
bff431e4 | 785 | |
64ed0ab8 | 786 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 787 | retval = -ENXIO; |
64ed0ab8 DT |
788 | goto out_free_pointer; |
789 | } | |
bff431e4 | 790 | |
37830662 | 791 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
792 | total = obj->buffer.length / sizeof(struct guid_block); |
793 | ||
bff431e4 | 794 | for (i = 0; i < total; i++) { |
d1f9e497 CC |
795 | /* |
796 | Some WMI devices, like those for nVidia hooks, have a | |
797 | duplicate GUID. It's not clear what we should do in this | |
798 | case yet, so for now, we'll just ignore the duplicate. | |
799 | Anyone who wants to add support for that device can come | |
800 | up with a better workaround for the mess then. | |
801 | */ | |
802 | if (guid_already_parsed(gblock[i].guid) == true) { | |
803 | wmi_gtoa(gblock[i].guid, guid_string); | |
8e07514d | 804 | pr_info("Skipping duplicate GUID %s\n", guid_string); |
d1f9e497 CC |
805 | continue; |
806 | } | |
c64eefd4 | 807 | |
a929aae0 TR |
808 | if (debug_dump_wdg) |
809 | wmi_dump_wdg(&gblock[i]); | |
810 | ||
c64eefd4 DT |
811 | wblock = wmi_create_device(&gblock[i], handle); |
812 | if (IS_ERR(wblock)) { | |
813 | retval = PTR_ERR(wblock); | |
814 | wmi_free_devices(); | |
815 | break; | |
a5167c5b | 816 | } |
bff431e4 | 817 | |
fc3155b2 TR |
818 | if (debug_event) { |
819 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 820 | wmi_method_enable(wblock, 1); |
fc3155b2 | 821 | } |
bff431e4 CC |
822 | } |
823 | ||
c64eefd4 DT |
824 | retval = 0; |
825 | ||
a5167c5b AL |
826 | out_free_pointer: |
827 | kfree(out.pointer); | |
bff431e4 | 828 | |
c64eefd4 | 829 | return retval; |
bff431e4 CC |
830 | } |
831 | ||
832 | /* | |
833 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
834 | * hand these off to the EC driver. | |
835 | */ | |
836 | static acpi_status | |
837 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 838 | u32 bits, u64 *value, |
bff431e4 CC |
839 | void *handler_context, void *region_context) |
840 | { | |
841 | int result = 0, i = 0; | |
842 | u8 temp = 0; | |
843 | ||
844 | if ((address > 0xFF) || !value) | |
845 | return AE_BAD_PARAMETER; | |
846 | ||
847 | if (function != ACPI_READ && function != ACPI_WRITE) | |
848 | return AE_BAD_PARAMETER; | |
849 | ||
850 | if (bits != 8) | |
851 | return AE_BAD_PARAMETER; | |
852 | ||
853 | if (function == ACPI_READ) { | |
854 | result = ec_read(address, &temp); | |
439913ff | 855 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
856 | } else { |
857 | temp = 0xff & ((*value) >> i); | |
858 | result = ec_write(address, temp); | |
859 | } | |
860 | ||
861 | switch (result) { | |
862 | case -EINVAL: | |
863 | return AE_BAD_PARAMETER; | |
864 | break; | |
865 | case -ENODEV: | |
866 | return AE_NOT_FOUND; | |
867 | break; | |
868 | case -ETIME: | |
869 | return AE_TIME; | |
870 | break; | |
871 | default: | |
872 | return AE_OK; | |
873 | } | |
874 | } | |
875 | ||
f61bb939 | 876 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
877 | { |
878 | struct guid_block *block; | |
879 | struct wmi_block *wblock; | |
880 | struct list_head *p; | |
7715348c | 881 | char guid_string[37]; |
bff431e4 | 882 | |
762e1a2f | 883 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
884 | wblock = list_entry(p, struct wmi_block, list); |
885 | block = &wblock->gblock; | |
886 | ||
887 | if ((block->flags & ACPI_WMI_EVENT) && | |
888 | (block->notify_id == event)) { | |
889 | if (wblock->handler) | |
890 | wblock->handler(event, wblock->handler_data); | |
7715348c TR |
891 | if (debug_event) { |
892 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
8e07514d | 893 | pr_info("DEBUG Event GUID: %s\n", guid_string); |
7715348c | 894 | } |
bff431e4 CC |
895 | |
896 | acpi_bus_generate_netlink_event( | |
0794469d | 897 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
898 | event, 0); |
899 | break; | |
900 | } | |
901 | } | |
902 | } | |
903 | ||
904 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
905 | { | |
bff431e4 CC |
906 | acpi_remove_address_space_handler(device->handle, |
907 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
c64eefd4 | 908 | wmi_free_devices(); |
bff431e4 CC |
909 | |
910 | return 0; | |
911 | } | |
912 | ||
925b1089 | 913 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
914 | { |
915 | acpi_status status; | |
c64eefd4 | 916 | int error; |
bff431e4 | 917 | |
bff431e4 CC |
918 | status = acpi_install_address_space_handler(device->handle, |
919 | ACPI_ADR_SPACE_EC, | |
920 | &acpi_wmi_ec_space_handler, | |
921 | NULL, NULL); | |
5212cd67 | 922 | if (ACPI_FAILURE(status)) { |
8e07514d | 923 | pr_err("Error installing EC region handler\n"); |
bff431e4 | 924 | return -ENODEV; |
5212cd67 | 925 | } |
bff431e4 | 926 | |
c64eefd4 DT |
927 | error = parse_wdg(device->handle); |
928 | if (error) { | |
5212cd67 DT |
929 | acpi_remove_address_space_handler(device->handle, |
930 | ACPI_ADR_SPACE_EC, | |
931 | &acpi_wmi_ec_space_handler); | |
8e07514d | 932 | pr_err("Failed to parse WDG method\n"); |
c64eefd4 | 933 | return error; |
bff431e4 CC |
934 | } |
935 | ||
c64eefd4 | 936 | return 0; |
bff431e4 CC |
937 | } |
938 | ||
939 | static int __init acpi_wmi_init(void) | |
940 | { | |
c64eefd4 | 941 | int error; |
bff431e4 CC |
942 | |
943 | if (acpi_disabled) | |
944 | return -ENODEV; | |
945 | ||
c64eefd4 DT |
946 | error = class_register(&wmi_class); |
947 | if (error) | |
948 | return error; | |
1caab3c1 | 949 | |
c64eefd4 DT |
950 | error = acpi_bus_register_driver(&acpi_wmi_driver); |
951 | if (error) { | |
952 | pr_err("Error loading mapper\n"); | |
953 | class_unregister(&wmi_class); | |
954 | return error; | |
bff431e4 CC |
955 | } |
956 | ||
8e07514d | 957 | pr_info("Mapper loaded\n"); |
8e07514d | 958 | return 0; |
bff431e4 CC |
959 | } |
960 | ||
961 | static void __exit acpi_wmi_exit(void) | |
962 | { | |
bff431e4 | 963 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
c64eefd4 | 964 | class_unregister(&wmi_class); |
bff431e4 | 965 | |
8e07514d | 966 | pr_info("Mapper unloaded\n"); |
bff431e4 CC |
967 | } |
968 | ||
969 | subsys_initcall(acpi_wmi_init); | |
970 | module_exit(acpi_wmi_exit); |