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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 | ||
bff431e4 | 48 | static DEFINE_MUTEX(wmi_data_lock); |
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 | ||
119 | /** | |
120 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
121 | * @src: Pointer to at least 2 characters to convert. | |
122 | * | |
123 | * Convert a two character ASCII hex string to a number. | |
124 | * | |
125 | * Return: 0-255 Success, the byte was parsed correctly | |
126 | * -1 Error, an invalid character was supplied | |
127 | */ | |
128 | static int wmi_parse_hexbyte(const u8 *src) | |
129 | { | |
bff431e4 | 130 | int h; |
392bd8b5 | 131 | int value; |
bff431e4 CC |
132 | |
133 | /* high part */ | |
392bd8b5 AS |
134 | h = value = hex_to_bin(src[0]); |
135 | if (value < 0) | |
bff431e4 | 136 | return -1; |
bff431e4 CC |
137 | |
138 | /* low part */ | |
392bd8b5 AS |
139 | value = hex_to_bin(src[1]); |
140 | if (value >= 0) | |
141 | return (h << 4) | value; | |
bff431e4 CC |
142 | return -1; |
143 | } | |
144 | ||
145 | /** | |
146 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
147 | * @src: Memory block holding binary GUID (16 bytes) | |
148 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
149 | * | |
150 | * Byte swap a binary GUID to match it's real GUID value | |
151 | */ | |
152 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
153 | { | |
154 | int i; | |
155 | ||
156 | for (i = 0; i <= 3; i++) | |
157 | memcpy(dest + i, src + (3 - i), 1); | |
158 | ||
159 | for (i = 0; i <= 1; i++) | |
160 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
161 | ||
162 | for (i = 0; i <= 1; i++) | |
163 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
164 | ||
165 | memcpy(dest + 8, src + 8, 8); | |
166 | } | |
167 | ||
168 | /** | |
169 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
170 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
171 | * @dest: Memory block to hold binary GUID (16 bytes) | |
172 | * | |
173 | * N.B. The GUID need not be NULL terminated. | |
174 | * | |
175 | * Return: 'true' @dest contains binary GUID | |
176 | * 'false' @dest contents are undefined | |
177 | */ | |
178 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
179 | { | |
180 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
181 | int i, j, v; | |
182 | ||
183 | if (src[8] != '-' || src[13] != '-' || | |
184 | src[18] != '-' || src[23] != '-') | |
185 | return false; | |
186 | ||
187 | for (j = 0; j < 5; j++, src++) { | |
188 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
189 | v = wmi_parse_hexbyte(src); | |
190 | if (v < 0) | |
191 | return false; | |
192 | } | |
193 | } | |
194 | ||
195 | return true; | |
196 | } | |
197 | ||
1caab3c1 MG |
198 | /* |
199 | * Convert a raw GUID to the ACII string representation | |
200 | */ | |
201 | static int wmi_gtoa(const char *in, char *out) | |
202 | { | |
203 | int i; | |
204 | ||
205 | for (i = 3; i >= 0; i--) | |
206 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
207 | ||
208 | out += sprintf(out, "-"); | |
209 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
210 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
211 | out += sprintf(out, "-"); | |
212 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
213 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
214 | out += sprintf(out, "-"); | |
215 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
216 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
217 | out += sprintf(out, "-"); | |
218 | ||
219 | for (i = 10; i <= 15; i++) | |
220 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
221 | ||
4e4304d7 | 222 | *out = '\0'; |
1caab3c1 MG |
223 | return 0; |
224 | } | |
225 | ||
bff431e4 CC |
226 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
227 | { | |
228 | char tmp[16], guid_input[16]; | |
229 | struct wmi_block *wblock; | |
230 | struct guid_block *block; | |
231 | struct list_head *p; | |
232 | ||
233 | wmi_parse_guid(guid_string, tmp); | |
234 | wmi_swap_bytes(tmp, guid_input); | |
235 | ||
762e1a2f | 236 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
237 | wblock = list_entry(p, struct wmi_block, list); |
238 | block = &wblock->gblock; | |
239 | ||
240 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
241 | if (out) | |
242 | *out = wblock; | |
243 | return 1; | |
244 | } | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
a66bfa7a MG |
249 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
250 | { | |
251 | struct guid_block *block = NULL; | |
252 | char method[5]; | |
a66bfa7a MG |
253 | acpi_status status; |
254 | acpi_handle handle; | |
255 | ||
256 | block = &wblock->gblock; | |
257 | handle = wblock->handle; | |
258 | ||
259 | if (!block) | |
260 | return AE_NOT_EXIST; | |
261 | ||
a66bfa7a MG |
262 | |
263 | snprintf(method, 5, "WE%02X", block->notify_id); | |
8122ab66 | 264 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
265 | |
266 | if (status != AE_OK && status != AE_NOT_FOUND) | |
267 | return status; | |
268 | else | |
269 | return AE_OK; | |
270 | } | |
271 | ||
bff431e4 CC |
272 | /* |
273 | * Exported WMI functions | |
274 | */ | |
275 | /** | |
276 | * wmi_evaluate_method - Evaluate a WMI method | |
277 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
278 | * @instance: Instance index | |
279 | * @method_id: Method ID to call | |
280 | * &in: Buffer containing input for the method call | |
281 | * &out: Empty buffer to return the method results | |
282 | * | |
283 | * Call an ACPI-WMI method | |
284 | */ | |
285 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
286 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
287 | { | |
288 | struct guid_block *block = NULL; | |
289 | struct wmi_block *wblock = NULL; | |
290 | acpi_handle handle; | |
291 | acpi_status status; | |
292 | struct acpi_object_list input; | |
293 | union acpi_object params[3]; | |
f3d83e24 | 294 | char method[5] = "WM"; |
bff431e4 CC |
295 | |
296 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 297 | return AE_ERROR; |
bff431e4 CC |
298 | |
299 | block = &wblock->gblock; | |
300 | handle = wblock->handle; | |
301 | ||
e6bafba5 | 302 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
303 | return AE_BAD_DATA; |
304 | ||
305 | if (block->instance_count < instance) | |
306 | return AE_BAD_PARAMETER; | |
307 | ||
308 | input.count = 2; | |
309 | input.pointer = params; | |
310 | params[0].type = ACPI_TYPE_INTEGER; | |
311 | params[0].integer.value = instance; | |
312 | params[1].type = ACPI_TYPE_INTEGER; | |
313 | params[1].integer.value = method_id; | |
314 | ||
315 | if (in) { | |
316 | input.count = 3; | |
317 | ||
318 | if (block->flags & ACPI_WMI_STRING) { | |
319 | params[2].type = ACPI_TYPE_STRING; | |
320 | } else { | |
321 | params[2].type = ACPI_TYPE_BUFFER; | |
322 | } | |
323 | params[2].buffer.length = in->length; | |
324 | params[2].buffer.pointer = in->pointer; | |
325 | } | |
326 | ||
327 | strncat(method, block->object_id, 2); | |
328 | ||
329 | status = acpi_evaluate_object(handle, method, &input, out); | |
330 | ||
331 | return status; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
334 | ||
335 | /** | |
336 | * wmi_query_block - Return contents of a WMI block | |
337 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
338 | * @instance: Instance index | |
339 | * &out: Empty buffer to return the contents of the data block to | |
340 | * | |
341 | * Return the contents of an ACPI-WMI data block to a buffer | |
342 | */ | |
343 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
344 | struct acpi_buffer *out) | |
345 | { | |
346 | struct guid_block *block = NULL; | |
347 | struct wmi_block *wblock = NULL; | |
54f14c27 | 348 | acpi_handle handle; |
bff431e4 | 349 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
350 | struct acpi_object_list input; |
351 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
352 | char method[5]; |
353 | char wc_method[5] = "WC"; | |
bff431e4 CC |
354 | |
355 | if (!guid_string || !out) | |
356 | return AE_BAD_PARAMETER; | |
357 | ||
358 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 359 | return AE_ERROR; |
bff431e4 CC |
360 | |
361 | block = &wblock->gblock; | |
362 | handle = wblock->handle; | |
363 | ||
364 | if (block->instance_count < instance) | |
365 | return AE_BAD_PARAMETER; | |
366 | ||
367 | /* Check GUID is a data block */ | |
368 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 369 | return AE_ERROR; |
bff431e4 CC |
370 | |
371 | input.count = 1; | |
372 | input.pointer = wq_params; | |
373 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
374 | wq_params[0].integer.value = instance; | |
375 | ||
376 | /* | |
377 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
378 | * enable collection. | |
379 | */ | |
380 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
381 | strncat(wc_method, block->object_id, 2); |
382 | ||
383 | /* | |
384 | * Some GUIDs break the specification by declaring themselves | |
385 | * expensive, but have no corresponding WCxx method. So we | |
386 | * should not fail if this happens. | |
387 | */ | |
54f14c27 | 388 | if (acpi_has_method(handle, wc_method)) |
8122ab66 ZR |
389 | wc_status = acpi_execute_simple_method(handle, |
390 | wc_method, 1); | |
bff431e4 CC |
391 | } |
392 | ||
393 | strcpy(method, "WQ"); | |
394 | strncat(method, block->object_id, 2); | |
395 | ||
dab36ad8 | 396 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
397 | |
398 | /* | |
399 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
400 | * the WQxx method failed - we should disable collection anyway. | |
401 | */ | |
a527f2d7 | 402 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8122ab66 | 403 | status = acpi_execute_simple_method(handle, wc_method, 0); |
bff431e4 CC |
404 | } |
405 | ||
406 | return status; | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
409 | ||
410 | /** | |
411 | * wmi_set_block - Write to a WMI block | |
412 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
413 | * @instance: Instance index | |
414 | * &in: Buffer containing new values for the data block | |
415 | * | |
416 | * Write the contents of the input buffer to an ACPI-WMI data block | |
417 | */ | |
418 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
419 | const struct acpi_buffer *in) | |
420 | { | |
421 | struct guid_block *block = NULL; | |
422 | struct wmi_block *wblock = NULL; | |
423 | acpi_handle handle; | |
424 | struct acpi_object_list input; | |
425 | union acpi_object params[2]; | |
f3d83e24 | 426 | char method[5] = "WS"; |
bff431e4 CC |
427 | |
428 | if (!guid_string || !in) | |
429 | return AE_BAD_DATA; | |
430 | ||
431 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 432 | return AE_ERROR; |
bff431e4 CC |
433 | |
434 | block = &wblock->gblock; | |
435 | handle = wblock->handle; | |
436 | ||
437 | if (block->instance_count < instance) | |
438 | return AE_BAD_PARAMETER; | |
439 | ||
440 | /* Check GUID is a data block */ | |
441 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 442 | return AE_ERROR; |
bff431e4 CC |
443 | |
444 | input.count = 2; | |
445 | input.pointer = params; | |
446 | params[0].type = ACPI_TYPE_INTEGER; | |
447 | params[0].integer.value = instance; | |
448 | ||
449 | if (block->flags & ACPI_WMI_STRING) { | |
450 | params[1].type = ACPI_TYPE_STRING; | |
451 | } else { | |
452 | params[1].type = ACPI_TYPE_BUFFER; | |
453 | } | |
454 | params[1].buffer.length = in->length; | |
455 | params[1].buffer.pointer = in->pointer; | |
456 | ||
457 | strncat(method, block->object_id, 2); | |
458 | ||
459 | return acpi_evaluate_object(handle, method, &input, NULL); | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
462 | ||
37830662 | 463 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 TR |
464 | { |
465 | char guid_string[37]; | |
466 | ||
467 | wmi_gtoa(g->guid, guid_string); | |
8e07514d DT |
468 | |
469 | pr_info("%s:\n", guid_string); | |
470 | pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]); | |
471 | pr_info("\tnotify_id: %02X\n", g->notify_id); | |
472 | pr_info("\treserved: %02X\n", g->reserved); | |
473 | pr_info("\tinstance_count: %d\n", g->instance_count); | |
dd8e908e | 474 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 475 | if (g->flags) { |
a929aae0 | 476 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 477 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 478 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 479 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 480 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 481 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 482 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 483 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 484 | } |
8e07514d | 485 | pr_cont("\n"); |
a929aae0 TR |
486 | |
487 | } | |
488 | ||
fc3155b2 TR |
489 | static void wmi_notify_debug(u32 value, void *context) |
490 | { | |
491 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
492 | union acpi_object *obj; | |
1492616a | 493 | acpi_status status; |
fc3155b2 | 494 | |
1492616a AL |
495 | status = wmi_get_event_data(value, &response); |
496 | if (status != AE_OK) { | |
8e07514d | 497 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
498 | return; |
499 | } | |
fc3155b2 TR |
500 | |
501 | obj = (union acpi_object *)response.pointer; | |
502 | ||
503 | if (!obj) | |
504 | return; | |
505 | ||
8e07514d | 506 | pr_info("DEBUG Event "); |
fc3155b2 TR |
507 | switch(obj->type) { |
508 | case ACPI_TYPE_BUFFER: | |
8e07514d | 509 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
510 | break; |
511 | case ACPI_TYPE_STRING: | |
8e07514d | 512 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
513 | break; |
514 | case ACPI_TYPE_INTEGER: | |
8e07514d | 515 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
516 | break; |
517 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 518 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
519 | break; |
520 | default: | |
8e07514d | 521 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 522 | } |
1492616a | 523 | kfree(obj); |
fc3155b2 TR |
524 | } |
525 | ||
bff431e4 CC |
526 | /** |
527 | * wmi_install_notify_handler - Register handler for WMI events | |
528 | * @handler: Function to handle notifications | |
529 | * @data: Data to be returned to handler when event is fired | |
530 | * | |
531 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
532 | */ | |
533 | acpi_status wmi_install_notify_handler(const char *guid, | |
534 | wmi_notify_handler handler, void *data) | |
535 | { | |
536 | struct wmi_block *block; | |
58f6425e CK |
537 | acpi_status status = AE_NOT_EXIST; |
538 | char tmp[16], guid_input[16]; | |
539 | struct list_head *p; | |
bff431e4 CC |
540 | |
541 | if (!guid || !handler) | |
542 | return AE_BAD_PARAMETER; | |
543 | ||
58f6425e CK |
544 | wmi_parse_guid(guid, tmp); |
545 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 546 | |
58f6425e CK |
547 | list_for_each(p, &wmi_block_list) { |
548 | acpi_status wmi_status; | |
549 | block = list_entry(p, struct wmi_block, list); | |
550 | ||
551 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
552 | if (block->handler && | |
553 | block->handler != wmi_notify_debug) | |
554 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 555 | |
58f6425e CK |
556 | block->handler = handler; |
557 | block->handler_data = data; | |
bff431e4 | 558 | |
58f6425e CK |
559 | wmi_status = wmi_method_enable(block, 1); |
560 | if ((wmi_status != AE_OK) || | |
561 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
562 | status = wmi_status; | |
563 | } | |
564 | } | |
a66bfa7a MG |
565 | |
566 | return status; | |
bff431e4 CC |
567 | } |
568 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
569 | ||
570 | /** | |
571 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
572 | * | |
573 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
574 | */ | |
575 | acpi_status wmi_remove_notify_handler(const char *guid) | |
576 | { | |
577 | struct wmi_block *block; | |
58f6425e CK |
578 | acpi_status status = AE_NOT_EXIST; |
579 | char tmp[16], guid_input[16]; | |
580 | struct list_head *p; | |
bff431e4 CC |
581 | |
582 | if (!guid) | |
583 | return AE_BAD_PARAMETER; | |
584 | ||
58f6425e CK |
585 | wmi_parse_guid(guid, tmp); |
586 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 587 | |
58f6425e CK |
588 | list_for_each(p, &wmi_block_list) { |
589 | acpi_status wmi_status; | |
590 | block = list_entry(p, struct wmi_block, list); | |
591 | ||
592 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
593 | if (!block->handler || | |
594 | block->handler == wmi_notify_debug) | |
595 | return AE_NULL_ENTRY; | |
596 | ||
597 | if (debug_event) { | |
598 | block->handler = wmi_notify_debug; | |
599 | status = AE_OK; | |
600 | } else { | |
601 | wmi_status = wmi_method_enable(block, 0); | |
602 | block->handler = NULL; | |
603 | block->handler_data = NULL; | |
604 | if ((wmi_status != AE_OK) || | |
605 | ((wmi_status == AE_OK) && | |
606 | (status == AE_NOT_EXIST))) | |
607 | status = wmi_status; | |
608 | } | |
609 | } | |
fc3155b2 | 610 | } |
58f6425e | 611 | |
a66bfa7a | 612 | return status; |
bff431e4 CC |
613 | } |
614 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
615 | ||
616 | /** | |
617 | * wmi_get_event_data - Get WMI data associated with an event | |
618 | * | |
3e9b988e AA |
619 | * @event: Event to find |
620 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
621 | * |
622 | * Returns extra data associated with an event in WMI. | |
623 | */ | |
624 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
625 | { | |
626 | struct acpi_object_list input; | |
627 | union acpi_object params[1]; | |
628 | struct guid_block *gblock; | |
629 | struct wmi_block *wblock; | |
630 | struct list_head *p; | |
631 | ||
632 | input.count = 1; | |
633 | input.pointer = params; | |
634 | params[0].type = ACPI_TYPE_INTEGER; | |
635 | params[0].integer.value = event; | |
636 | ||
762e1a2f | 637 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
638 | wblock = list_entry(p, struct wmi_block, list); |
639 | gblock = &wblock->gblock; | |
640 | ||
641 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
642 | (gblock->notify_id == event)) | |
643 | return acpi_evaluate_object(wblock->handle, "_WED", | |
644 | &input, out); | |
645 | } | |
646 | ||
647 | return AE_NOT_FOUND; | |
648 | } | |
649 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
650 | ||
651 | /** | |
652 | * wmi_has_guid - Check if a GUID is available | |
653 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
654 | * | |
655 | * Check if a given GUID is defined by _WDG | |
656 | */ | |
657 | bool wmi_has_guid(const char *guid_string) | |
658 | { | |
659 | return find_guid(guid_string, NULL); | |
660 | } | |
661 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
662 | ||
1caab3c1 MG |
663 | /* |
664 | * sysfs interface | |
665 | */ | |
614ef432 | 666 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
667 | char *buf) |
668 | { | |
669 | char guid_string[37]; | |
670 | struct wmi_block *wblock; | |
671 | ||
672 | wblock = dev_get_drvdata(dev); | |
673 | if (!wblock) | |
674 | return -ENOMEM; | |
675 | ||
676 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
677 | ||
678 | return sprintf(buf, "wmi:%s\n", guid_string); | |
679 | } | |
e80b89a5 | 680 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 681 | |
e80b89a5 GKH |
682 | static struct attribute *wmi_attrs[] = { |
683 | &dev_attr_modalias.attr, | |
684 | NULL, | |
614ef432 | 685 | }; |
e80b89a5 | 686 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 MG |
687 | |
688 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
689 | { | |
690 | char guid_string[37]; | |
691 | ||
692 | struct wmi_block *wblock; | |
693 | ||
694 | if (add_uevent_var(env, "MODALIAS=")) | |
695 | return -ENOMEM; | |
696 | ||
697 | wblock = dev_get_drvdata(dev); | |
698 | if (!wblock) | |
699 | return -ENOMEM; | |
700 | ||
701 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
702 | ||
703 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
704 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
705 | env->buflen += 40; | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static void wmi_dev_free(struct device *dev) | |
711 | { | |
c64eefd4 DT |
712 | struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev); |
713 | ||
714 | kfree(wmi_block); | |
1caab3c1 MG |
715 | } |
716 | ||
717 | static struct class wmi_class = { | |
718 | .name = "wmi", | |
719 | .dev_release = wmi_dev_free, | |
720 | .dev_uevent = wmi_dev_uevent, | |
e80b89a5 | 721 | .dev_groups = wmi_groups, |
1caab3c1 MG |
722 | }; |
723 | ||
58f6425e CK |
724 | static int wmi_create_device(const struct guid_block *gblock, |
725 | struct wmi_block *wblock, acpi_handle handle) | |
1caab3c1 | 726 | { |
c64eefd4 | 727 | char guid_string[37]; |
1caab3c1 | 728 | |
c64eefd4 | 729 | wblock->dev.class = &wmi_class; |
1caab3c1 | 730 | |
c64eefd4 | 731 | wmi_gtoa(gblock->guid, guid_string); |
02aa2a37 | 732 | dev_set_name(&wblock->dev, "%s", guid_string); |
1caab3c1 | 733 | |
c64eefd4 | 734 | dev_set_drvdata(&wblock->dev, wblock); |
1caab3c1 | 735 | |
58f6425e | 736 | return device_register(&wblock->dev); |
1caab3c1 MG |
737 | } |
738 | ||
c64eefd4 | 739 | static void wmi_free_devices(void) |
1caab3c1 | 740 | { |
c64eefd4 | 741 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
742 | |
743 | /* Delete devices for all the GUIDs */ | |
023b9565 DT |
744 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
745 | list_del(&wblock->list); | |
58f6425e CK |
746 | if (wblock->dev.class) |
747 | device_unregister(&wblock->dev); | |
023b9565 DT |
748 | else |
749 | kfree(wblock); | |
750 | } | |
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 | */ | |
0a018a68 | 767 | static int 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 CC |
772 | struct wmi_block *wblock; |
773 | acpi_status status; | |
c64eefd4 | 774 | int retval; |
bff431e4 CC |
775 | u32 i, total; |
776 | ||
777 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
bff431e4 | 778 | if (ACPI_FAILURE(status)) |
c64eefd4 | 779 | return -ENXIO; |
bff431e4 CC |
780 | |
781 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 782 | if (!obj) |
c64eefd4 | 783 | return -ENXIO; |
bff431e4 | 784 | |
64ed0ab8 | 785 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 786 | retval = -ENXIO; |
64ed0ab8 DT |
787 | goto out_free_pointer; |
788 | } | |
bff431e4 | 789 | |
37830662 | 790 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
791 | total = obj->buffer.length / sizeof(struct guid_block); |
792 | ||
bff431e4 | 793 | for (i = 0; i < total; i++) { |
58f6425e CK |
794 | if (debug_dump_wdg) |
795 | wmi_dump_wdg(&gblock[i]); | |
796 | ||
797 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
798 | if (!wblock) | |
0a018a68 | 799 | return -ENOMEM; |
58f6425e CK |
800 | |
801 | wblock->handle = handle; | |
802 | wblock->gblock = gblock[i]; | |
803 | ||
d1f9e497 CC |
804 | /* |
805 | Some WMI devices, like those for nVidia hooks, have a | |
806 | duplicate GUID. It's not clear what we should do in this | |
58f6425e CK |
807 | case yet, so for now, we'll just ignore the duplicate |
808 | for device creation. | |
d1f9e497 | 809 | */ |
58f6425e CK |
810 | if (!guid_already_parsed(gblock[i].guid)) { |
811 | retval = wmi_create_device(&gblock[i], wblock, handle); | |
812 | if (retval) { | |
813 | wmi_free_devices(); | |
e1e0dacb | 814 | goto out_free_pointer; |
58f6425e | 815 | } |
d1f9e497 | 816 | } |
c64eefd4 | 817 | |
58f6425e | 818 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 819 | |
fc3155b2 TR |
820 | if (debug_event) { |
821 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 822 | wmi_method_enable(wblock, 1); |
fc3155b2 | 823 | } |
bff431e4 CC |
824 | } |
825 | ||
c64eefd4 DT |
826 | retval = 0; |
827 | ||
a5167c5b AL |
828 | out_free_pointer: |
829 | kfree(out.pointer); | |
bff431e4 | 830 | |
c64eefd4 | 831 | return retval; |
bff431e4 CC |
832 | } |
833 | ||
834 | /* | |
835 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
836 | * hand these off to the EC driver. | |
837 | */ | |
838 | static acpi_status | |
839 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 840 | u32 bits, u64 *value, |
bff431e4 CC |
841 | void *handler_context, void *region_context) |
842 | { | |
843 | int result = 0, i = 0; | |
844 | u8 temp = 0; | |
845 | ||
846 | if ((address > 0xFF) || !value) | |
847 | return AE_BAD_PARAMETER; | |
848 | ||
849 | if (function != ACPI_READ && function != ACPI_WRITE) | |
850 | return AE_BAD_PARAMETER; | |
851 | ||
852 | if (bits != 8) | |
853 | return AE_BAD_PARAMETER; | |
854 | ||
855 | if (function == ACPI_READ) { | |
856 | result = ec_read(address, &temp); | |
439913ff | 857 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
858 | } else { |
859 | temp = 0xff & ((*value) >> i); | |
860 | result = ec_write(address, temp); | |
861 | } | |
862 | ||
863 | switch (result) { | |
864 | case -EINVAL: | |
865 | return AE_BAD_PARAMETER; | |
866 | break; | |
867 | case -ENODEV: | |
868 | return AE_NOT_FOUND; | |
869 | break; | |
870 | case -ETIME: | |
871 | return AE_TIME; | |
872 | break; | |
873 | default: | |
874 | return AE_OK; | |
875 | } | |
876 | } | |
877 | ||
f61bb939 | 878 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
879 | { |
880 | struct guid_block *block; | |
881 | struct wmi_block *wblock; | |
882 | struct list_head *p; | |
7715348c | 883 | char guid_string[37]; |
bff431e4 | 884 | |
762e1a2f | 885 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
886 | wblock = list_entry(p, struct wmi_block, list); |
887 | block = &wblock->gblock; | |
888 | ||
889 | if ((block->flags & ACPI_WMI_EVENT) && | |
890 | (block->notify_id == event)) { | |
891 | if (wblock->handler) | |
892 | wblock->handler(event, wblock->handler_data); | |
7715348c TR |
893 | if (debug_event) { |
894 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
8e07514d | 895 | pr_info("DEBUG Event GUID: %s\n", guid_string); |
7715348c | 896 | } |
bff431e4 CC |
897 | |
898 | acpi_bus_generate_netlink_event( | |
0794469d | 899 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
900 | event, 0); |
901 | break; | |
902 | } | |
903 | } | |
904 | } | |
905 | ||
51fac838 | 906 | static int acpi_wmi_remove(struct acpi_device *device) |
bff431e4 | 907 | { |
bff431e4 CC |
908 | acpi_remove_address_space_handler(device->handle, |
909 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
c64eefd4 | 910 | wmi_free_devices(); |
bff431e4 CC |
911 | |
912 | return 0; | |
913 | } | |
914 | ||
925b1089 | 915 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
916 | { |
917 | acpi_status status; | |
c64eefd4 | 918 | int error; |
bff431e4 | 919 | |
bff431e4 CC |
920 | status = acpi_install_address_space_handler(device->handle, |
921 | ACPI_ADR_SPACE_EC, | |
922 | &acpi_wmi_ec_space_handler, | |
923 | NULL, NULL); | |
5212cd67 | 924 | if (ACPI_FAILURE(status)) { |
8e07514d | 925 | pr_err("Error installing EC region handler\n"); |
bff431e4 | 926 | return -ENODEV; |
5212cd67 | 927 | } |
bff431e4 | 928 | |
c64eefd4 DT |
929 | error = parse_wdg(device->handle); |
930 | if (error) { | |
5212cd67 DT |
931 | acpi_remove_address_space_handler(device->handle, |
932 | ACPI_ADR_SPACE_EC, | |
933 | &acpi_wmi_ec_space_handler); | |
8e07514d | 934 | pr_err("Failed to parse WDG method\n"); |
c64eefd4 | 935 | return error; |
bff431e4 CC |
936 | } |
937 | ||
c64eefd4 | 938 | return 0; |
bff431e4 CC |
939 | } |
940 | ||
941 | static int __init acpi_wmi_init(void) | |
942 | { | |
c64eefd4 | 943 | int error; |
bff431e4 CC |
944 | |
945 | if (acpi_disabled) | |
946 | return -ENODEV; | |
947 | ||
c64eefd4 DT |
948 | error = class_register(&wmi_class); |
949 | if (error) | |
950 | return error; | |
1caab3c1 | 951 | |
c64eefd4 DT |
952 | error = acpi_bus_register_driver(&acpi_wmi_driver); |
953 | if (error) { | |
954 | pr_err("Error loading mapper\n"); | |
955 | class_unregister(&wmi_class); | |
956 | return error; | |
bff431e4 CC |
957 | } |
958 | ||
8e07514d | 959 | pr_info("Mapper loaded\n"); |
8e07514d | 960 | return 0; |
bff431e4 CC |
961 | } |
962 | ||
963 | static void __exit acpi_wmi_exit(void) | |
964 | { | |
bff431e4 | 965 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
c64eefd4 | 966 | class_unregister(&wmi_class); |
bff431e4 | 967 | |
8e07514d | 968 | pr_info("Mapper unloaded\n"); |
bff431e4 CC |
969 | } |
970 | ||
971 | subsys_initcall(acpi_wmi_init); | |
972 | module_exit(acpi_wmi_exit); |