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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 | ||
1caab3c1 MG |
197 | /* |
198 | * Convert a raw GUID to the ACII string representation | |
199 | */ | |
200 | static int wmi_gtoa(const char *in, char *out) | |
201 | { | |
202 | int i; | |
203 | ||
204 | for (i = 3; i >= 0; i--) | |
205 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
206 | ||
207 | out += sprintf(out, "-"); | |
208 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
209 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
210 | out += sprintf(out, "-"); | |
211 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
212 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
213 | out += sprintf(out, "-"); | |
214 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
215 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
216 | out += sprintf(out, "-"); | |
217 | ||
218 | for (i = 10; i <= 15; i++) | |
219 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
220 | ||
4e4304d7 | 221 | *out = '\0'; |
1caab3c1 MG |
222 | return 0; |
223 | } | |
224 | ||
bff431e4 CC |
225 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
226 | { | |
227 | char tmp[16], guid_input[16]; | |
228 | struct wmi_block *wblock; | |
229 | struct guid_block *block; | |
230 | struct list_head *p; | |
231 | ||
232 | wmi_parse_guid(guid_string, tmp); | |
233 | wmi_swap_bytes(tmp, guid_input); | |
234 | ||
762e1a2f | 235 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
236 | wblock = list_entry(p, struct wmi_block, list); |
237 | block = &wblock->gblock; | |
238 | ||
239 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
240 | if (out) | |
241 | *out = wblock; | |
242 | return 1; | |
243 | } | |
244 | } | |
245 | return 0; | |
246 | } | |
247 | ||
a66bfa7a MG |
248 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
249 | { | |
250 | struct guid_block *block = NULL; | |
251 | char method[5]; | |
a66bfa7a MG |
252 | acpi_status status; |
253 | acpi_handle handle; | |
254 | ||
255 | block = &wblock->gblock; | |
256 | handle = wblock->handle; | |
257 | ||
a66bfa7a | 258 | snprintf(method, 5, "WE%02X", block->notify_id); |
8122ab66 | 259 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
260 | |
261 | if (status != AE_OK && status != AE_NOT_FOUND) | |
262 | return status; | |
263 | else | |
264 | return AE_OK; | |
265 | } | |
266 | ||
bff431e4 CC |
267 | /* |
268 | * Exported WMI functions | |
269 | */ | |
270 | /** | |
271 | * wmi_evaluate_method - Evaluate a WMI method | |
272 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
273 | * @instance: Instance index | |
274 | * @method_id: Method ID to call | |
275 | * &in: Buffer containing input for the method call | |
276 | * &out: Empty buffer to return the method results | |
277 | * | |
278 | * Call an ACPI-WMI method | |
279 | */ | |
280 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
281 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
282 | { | |
283 | struct guid_block *block = NULL; | |
284 | struct wmi_block *wblock = NULL; | |
285 | acpi_handle handle; | |
286 | acpi_status status; | |
287 | struct acpi_object_list input; | |
288 | union acpi_object params[3]; | |
f3d83e24 | 289 | char method[5] = "WM"; |
bff431e4 CC |
290 | |
291 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 292 | return AE_ERROR; |
bff431e4 CC |
293 | |
294 | block = &wblock->gblock; | |
295 | handle = wblock->handle; | |
296 | ||
e6bafba5 | 297 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
298 | return AE_BAD_DATA; |
299 | ||
300 | if (block->instance_count < instance) | |
301 | return AE_BAD_PARAMETER; | |
302 | ||
303 | input.count = 2; | |
304 | input.pointer = params; | |
305 | params[0].type = ACPI_TYPE_INTEGER; | |
306 | params[0].integer.value = instance; | |
307 | params[1].type = ACPI_TYPE_INTEGER; | |
308 | params[1].integer.value = method_id; | |
309 | ||
310 | if (in) { | |
311 | input.count = 3; | |
312 | ||
313 | if (block->flags & ACPI_WMI_STRING) { | |
314 | params[2].type = ACPI_TYPE_STRING; | |
315 | } else { | |
316 | params[2].type = ACPI_TYPE_BUFFER; | |
317 | } | |
318 | params[2].buffer.length = in->length; | |
319 | params[2].buffer.pointer = in->pointer; | |
320 | } | |
321 | ||
322 | strncat(method, block->object_id, 2); | |
323 | ||
324 | status = acpi_evaluate_object(handle, method, &input, out); | |
325 | ||
326 | return status; | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
329 | ||
330 | /** | |
331 | * wmi_query_block - Return contents of a WMI block | |
332 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
333 | * @instance: Instance index | |
334 | * &out: Empty buffer to return the contents of the data block to | |
335 | * | |
336 | * Return the contents of an ACPI-WMI data block to a buffer | |
337 | */ | |
338 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
339 | struct acpi_buffer *out) | |
340 | { | |
341 | struct guid_block *block = NULL; | |
342 | struct wmi_block *wblock = NULL; | |
54f14c27 | 343 | acpi_handle handle; |
bff431e4 | 344 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
345 | struct acpi_object_list input; |
346 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
347 | char method[5]; |
348 | char wc_method[5] = "WC"; | |
bff431e4 CC |
349 | |
350 | if (!guid_string || !out) | |
351 | return AE_BAD_PARAMETER; | |
352 | ||
353 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 354 | return AE_ERROR; |
bff431e4 CC |
355 | |
356 | block = &wblock->gblock; | |
357 | handle = wblock->handle; | |
358 | ||
359 | if (block->instance_count < instance) | |
360 | return AE_BAD_PARAMETER; | |
361 | ||
362 | /* Check GUID is a data block */ | |
363 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 364 | return AE_ERROR; |
bff431e4 CC |
365 | |
366 | input.count = 1; | |
367 | input.pointer = wq_params; | |
368 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
369 | wq_params[0].integer.value = instance; | |
370 | ||
371 | /* | |
372 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
373 | * enable collection. | |
374 | */ | |
375 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
376 | strncat(wc_method, block->object_id, 2); |
377 | ||
378 | /* | |
379 | * Some GUIDs break the specification by declaring themselves | |
380 | * expensive, but have no corresponding WCxx method. So we | |
381 | * should not fail if this happens. | |
382 | */ | |
54f14c27 | 383 | if (acpi_has_method(handle, wc_method)) |
8122ab66 ZR |
384 | wc_status = acpi_execute_simple_method(handle, |
385 | wc_method, 1); | |
bff431e4 CC |
386 | } |
387 | ||
388 | strcpy(method, "WQ"); | |
389 | strncat(method, block->object_id, 2); | |
390 | ||
dab36ad8 | 391 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
392 | |
393 | /* | |
394 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
395 | * the WQxx method failed - we should disable collection anyway. | |
396 | */ | |
a527f2d7 | 397 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8122ab66 | 398 | status = acpi_execute_simple_method(handle, wc_method, 0); |
bff431e4 CC |
399 | } |
400 | ||
401 | return status; | |
402 | } | |
403 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
404 | ||
405 | /** | |
406 | * wmi_set_block - Write to a WMI block | |
407 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
408 | * @instance: Instance index | |
409 | * &in: Buffer containing new values for the data block | |
410 | * | |
411 | * Write the contents of the input buffer to an ACPI-WMI data block | |
412 | */ | |
413 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
414 | const struct acpi_buffer *in) | |
415 | { | |
416 | struct guid_block *block = NULL; | |
417 | struct wmi_block *wblock = NULL; | |
418 | acpi_handle handle; | |
419 | struct acpi_object_list input; | |
420 | union acpi_object params[2]; | |
f3d83e24 | 421 | char method[5] = "WS"; |
bff431e4 CC |
422 | |
423 | if (!guid_string || !in) | |
424 | return AE_BAD_DATA; | |
425 | ||
426 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 427 | return AE_ERROR; |
bff431e4 CC |
428 | |
429 | block = &wblock->gblock; | |
430 | handle = wblock->handle; | |
431 | ||
432 | if (block->instance_count < instance) | |
433 | return AE_BAD_PARAMETER; | |
434 | ||
435 | /* Check GUID is a data block */ | |
436 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 437 | return AE_ERROR; |
bff431e4 CC |
438 | |
439 | input.count = 2; | |
440 | input.pointer = params; | |
441 | params[0].type = ACPI_TYPE_INTEGER; | |
442 | params[0].integer.value = instance; | |
443 | ||
444 | if (block->flags & ACPI_WMI_STRING) { | |
445 | params[1].type = ACPI_TYPE_STRING; | |
446 | } else { | |
447 | params[1].type = ACPI_TYPE_BUFFER; | |
448 | } | |
449 | params[1].buffer.length = in->length; | |
450 | params[1].buffer.pointer = in->pointer; | |
451 | ||
452 | strncat(method, block->object_id, 2); | |
453 | ||
454 | return acpi_evaluate_object(handle, method, &input, NULL); | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
457 | ||
37830662 | 458 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 TR |
459 | { |
460 | char guid_string[37]; | |
461 | ||
462 | wmi_gtoa(g->guid, guid_string); | |
8e07514d DT |
463 | |
464 | pr_info("%s:\n", guid_string); | |
465 | pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]); | |
466 | pr_info("\tnotify_id: %02X\n", g->notify_id); | |
467 | pr_info("\treserved: %02X\n", g->reserved); | |
468 | pr_info("\tinstance_count: %d\n", g->instance_count); | |
dd8e908e | 469 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 470 | if (g->flags) { |
a929aae0 | 471 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 472 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 473 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 474 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 475 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 476 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 477 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 478 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 479 | } |
8e07514d | 480 | pr_cont("\n"); |
a929aae0 TR |
481 | |
482 | } | |
483 | ||
fc3155b2 TR |
484 | static void wmi_notify_debug(u32 value, void *context) |
485 | { | |
486 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
487 | union acpi_object *obj; | |
1492616a | 488 | acpi_status status; |
fc3155b2 | 489 | |
1492616a AL |
490 | status = wmi_get_event_data(value, &response); |
491 | if (status != AE_OK) { | |
8e07514d | 492 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
493 | return; |
494 | } | |
fc3155b2 TR |
495 | |
496 | obj = (union acpi_object *)response.pointer; | |
497 | ||
498 | if (!obj) | |
499 | return; | |
500 | ||
8e07514d | 501 | pr_info("DEBUG Event "); |
fc3155b2 TR |
502 | switch(obj->type) { |
503 | case ACPI_TYPE_BUFFER: | |
8e07514d | 504 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
505 | break; |
506 | case ACPI_TYPE_STRING: | |
8e07514d | 507 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
508 | break; |
509 | case ACPI_TYPE_INTEGER: | |
8e07514d | 510 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
511 | break; |
512 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 513 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
514 | break; |
515 | default: | |
8e07514d | 516 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 517 | } |
1492616a | 518 | kfree(obj); |
fc3155b2 TR |
519 | } |
520 | ||
bff431e4 CC |
521 | /** |
522 | * wmi_install_notify_handler - Register handler for WMI events | |
523 | * @handler: Function to handle notifications | |
524 | * @data: Data to be returned to handler when event is fired | |
525 | * | |
526 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
527 | */ | |
528 | acpi_status wmi_install_notify_handler(const char *guid, | |
529 | wmi_notify_handler handler, void *data) | |
530 | { | |
531 | struct wmi_block *block; | |
58f6425e CK |
532 | acpi_status status = AE_NOT_EXIST; |
533 | char tmp[16], guid_input[16]; | |
534 | struct list_head *p; | |
bff431e4 CC |
535 | |
536 | if (!guid || !handler) | |
537 | return AE_BAD_PARAMETER; | |
538 | ||
58f6425e CK |
539 | wmi_parse_guid(guid, tmp); |
540 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 541 | |
58f6425e CK |
542 | list_for_each(p, &wmi_block_list) { |
543 | acpi_status wmi_status; | |
544 | block = list_entry(p, struct wmi_block, list); | |
545 | ||
546 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
547 | if (block->handler && | |
548 | block->handler != wmi_notify_debug) | |
549 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 550 | |
58f6425e CK |
551 | block->handler = handler; |
552 | block->handler_data = data; | |
bff431e4 | 553 | |
58f6425e CK |
554 | wmi_status = wmi_method_enable(block, 1); |
555 | if ((wmi_status != AE_OK) || | |
556 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
557 | status = wmi_status; | |
558 | } | |
559 | } | |
a66bfa7a MG |
560 | |
561 | return status; | |
bff431e4 CC |
562 | } |
563 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
564 | ||
565 | /** | |
566 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
567 | * | |
568 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
569 | */ | |
570 | acpi_status wmi_remove_notify_handler(const char *guid) | |
571 | { | |
572 | struct wmi_block *block; | |
58f6425e CK |
573 | acpi_status status = AE_NOT_EXIST; |
574 | char tmp[16], guid_input[16]; | |
575 | struct list_head *p; | |
bff431e4 CC |
576 | |
577 | if (!guid) | |
578 | return AE_BAD_PARAMETER; | |
579 | ||
58f6425e CK |
580 | wmi_parse_guid(guid, tmp); |
581 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 582 | |
58f6425e CK |
583 | list_for_each(p, &wmi_block_list) { |
584 | acpi_status wmi_status; | |
585 | block = list_entry(p, struct wmi_block, list); | |
586 | ||
587 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
588 | if (!block->handler || | |
589 | block->handler == wmi_notify_debug) | |
590 | return AE_NULL_ENTRY; | |
591 | ||
592 | if (debug_event) { | |
593 | block->handler = wmi_notify_debug; | |
594 | status = AE_OK; | |
595 | } else { | |
596 | wmi_status = wmi_method_enable(block, 0); | |
597 | block->handler = NULL; | |
598 | block->handler_data = NULL; | |
599 | if ((wmi_status != AE_OK) || | |
600 | ((wmi_status == AE_OK) && | |
601 | (status == AE_NOT_EXIST))) | |
602 | status = wmi_status; | |
603 | } | |
604 | } | |
fc3155b2 | 605 | } |
58f6425e | 606 | |
a66bfa7a | 607 | return status; |
bff431e4 CC |
608 | } |
609 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
610 | ||
611 | /** | |
612 | * wmi_get_event_data - Get WMI data associated with an event | |
613 | * | |
3e9b988e AA |
614 | * @event: Event to find |
615 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
616 | * |
617 | * Returns extra data associated with an event in WMI. | |
618 | */ | |
619 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
620 | { | |
621 | struct acpi_object_list input; | |
622 | union acpi_object params[1]; | |
623 | struct guid_block *gblock; | |
624 | struct wmi_block *wblock; | |
625 | struct list_head *p; | |
626 | ||
627 | input.count = 1; | |
628 | input.pointer = params; | |
629 | params[0].type = ACPI_TYPE_INTEGER; | |
630 | params[0].integer.value = event; | |
631 | ||
762e1a2f | 632 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
633 | wblock = list_entry(p, struct wmi_block, list); |
634 | gblock = &wblock->gblock; | |
635 | ||
636 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
637 | (gblock->notify_id == event)) | |
638 | return acpi_evaluate_object(wblock->handle, "_WED", | |
639 | &input, out); | |
640 | } | |
641 | ||
642 | return AE_NOT_FOUND; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
645 | ||
646 | /** | |
647 | * wmi_has_guid - Check if a GUID is available | |
648 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
649 | * | |
650 | * Check if a given GUID is defined by _WDG | |
651 | */ | |
652 | bool wmi_has_guid(const char *guid_string) | |
653 | { | |
654 | return find_guid(guid_string, NULL); | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
657 | ||
1caab3c1 MG |
658 | /* |
659 | * sysfs interface | |
660 | */ | |
614ef432 | 661 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
662 | char *buf) |
663 | { | |
664 | char guid_string[37]; | |
665 | struct wmi_block *wblock; | |
666 | ||
667 | wblock = dev_get_drvdata(dev); | |
a80e1053 PB |
668 | if (!wblock) { |
669 | strcat(buf, "\n"); | |
670 | return strlen(buf); | |
671 | } | |
1caab3c1 MG |
672 | |
673 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
674 | ||
675 | return sprintf(buf, "wmi:%s\n", guid_string); | |
676 | } | |
e80b89a5 | 677 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 678 | |
e80b89a5 GKH |
679 | static struct attribute *wmi_attrs[] = { |
680 | &dev_attr_modalias.attr, | |
681 | NULL, | |
614ef432 | 682 | }; |
e80b89a5 | 683 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 MG |
684 | |
685 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
686 | { | |
687 | char guid_string[37]; | |
688 | ||
689 | struct wmi_block *wblock; | |
690 | ||
691 | if (add_uevent_var(env, "MODALIAS=")) | |
692 | return -ENOMEM; | |
693 | ||
694 | wblock = dev_get_drvdata(dev); | |
695 | if (!wblock) | |
696 | return -ENOMEM; | |
697 | ||
698 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
699 | ||
700 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
701 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
702 | env->buflen += 40; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | static void wmi_dev_free(struct device *dev) | |
708 | { | |
c64eefd4 DT |
709 | struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev); |
710 | ||
711 | kfree(wmi_block); | |
1caab3c1 MG |
712 | } |
713 | ||
714 | static struct class wmi_class = { | |
715 | .name = "wmi", | |
716 | .dev_release = wmi_dev_free, | |
717 | .dev_uevent = wmi_dev_uevent, | |
e80b89a5 | 718 | .dev_groups = wmi_groups, |
1caab3c1 MG |
719 | }; |
720 | ||
58f6425e CK |
721 | static int wmi_create_device(const struct guid_block *gblock, |
722 | struct wmi_block *wblock, acpi_handle handle) | |
1caab3c1 | 723 | { |
c64eefd4 | 724 | char guid_string[37]; |
1caab3c1 | 725 | |
c64eefd4 | 726 | wblock->dev.class = &wmi_class; |
1caab3c1 | 727 | |
c64eefd4 | 728 | wmi_gtoa(gblock->guid, guid_string); |
02aa2a37 | 729 | dev_set_name(&wblock->dev, "%s", guid_string); |
1caab3c1 | 730 | |
c64eefd4 | 731 | dev_set_drvdata(&wblock->dev, wblock); |
1caab3c1 | 732 | |
58f6425e | 733 | return device_register(&wblock->dev); |
1caab3c1 MG |
734 | } |
735 | ||
c64eefd4 | 736 | static void wmi_free_devices(void) |
1caab3c1 | 737 | { |
c64eefd4 | 738 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
739 | |
740 | /* Delete devices for all the GUIDs */ | |
023b9565 DT |
741 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
742 | list_del(&wblock->list); | |
58f6425e CK |
743 | if (wblock->dev.class) |
744 | device_unregister(&wblock->dev); | |
023b9565 DT |
745 | else |
746 | kfree(wblock); | |
747 | } | |
1caab3c1 MG |
748 | } |
749 | ||
d1f9e497 CC |
750 | static bool guid_already_parsed(const char *guid_string) |
751 | { | |
d1f9e497 | 752 | struct wmi_block *wblock; |
d1f9e497 | 753 | |
c64eefd4 | 754 | list_for_each_entry(wblock, &wmi_block_list, list) |
8b14d7b2 | 755 | if (memcmp(wblock->gblock.guid, guid_string, 16) == 0) |
d1f9e497 | 756 | return true; |
d1f9e497 | 757 | |
c64eefd4 | 758 | return false; |
2d5ab555 DT |
759 | } |
760 | ||
bff431e4 CC |
761 | /* |
762 | * Parse the _WDG method for the GUID data blocks | |
763 | */ | |
0a018a68 | 764 | static int parse_wdg(acpi_handle handle) |
bff431e4 CC |
765 | { |
766 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
767 | union acpi_object *obj; | |
37830662 | 768 | const struct guid_block *gblock; |
bff431e4 CC |
769 | struct wmi_block *wblock; |
770 | acpi_status status; | |
c64eefd4 | 771 | int retval; |
bff431e4 CC |
772 | u32 i, total; |
773 | ||
774 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
bff431e4 | 775 | if (ACPI_FAILURE(status)) |
c64eefd4 | 776 | return -ENXIO; |
bff431e4 CC |
777 | |
778 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 779 | if (!obj) |
c64eefd4 | 780 | return -ENXIO; |
bff431e4 | 781 | |
64ed0ab8 | 782 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 783 | retval = -ENXIO; |
64ed0ab8 DT |
784 | goto out_free_pointer; |
785 | } | |
bff431e4 | 786 | |
37830662 | 787 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
788 | total = obj->buffer.length / sizeof(struct guid_block); |
789 | ||
bff431e4 | 790 | for (i = 0; i < total; i++) { |
58f6425e CK |
791 | if (debug_dump_wdg) |
792 | wmi_dump_wdg(&gblock[i]); | |
793 | ||
794 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
795 | if (!wblock) | |
0a018a68 | 796 | return -ENOMEM; |
58f6425e CK |
797 | |
798 | wblock->handle = handle; | |
799 | wblock->gblock = gblock[i]; | |
800 | ||
d1f9e497 CC |
801 | /* |
802 | Some WMI devices, like those for nVidia hooks, have a | |
803 | duplicate GUID. It's not clear what we should do in this | |
58f6425e CK |
804 | case yet, so for now, we'll just ignore the duplicate |
805 | for device creation. | |
d1f9e497 | 806 | */ |
58f6425e CK |
807 | if (!guid_already_parsed(gblock[i].guid)) { |
808 | retval = wmi_create_device(&gblock[i], wblock, handle); | |
809 | if (retval) { | |
810 | wmi_free_devices(); | |
e1e0dacb | 811 | goto out_free_pointer; |
58f6425e | 812 | } |
d1f9e497 | 813 | } |
c64eefd4 | 814 | |
58f6425e | 815 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 816 | |
fc3155b2 TR |
817 | if (debug_event) { |
818 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 819 | wmi_method_enable(wblock, 1); |
fc3155b2 | 820 | } |
bff431e4 CC |
821 | } |
822 | ||
c64eefd4 DT |
823 | retval = 0; |
824 | ||
a5167c5b AL |
825 | out_free_pointer: |
826 | kfree(out.pointer); | |
bff431e4 | 827 | |
c64eefd4 | 828 | return retval; |
bff431e4 CC |
829 | } |
830 | ||
831 | /* | |
832 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
833 | * hand these off to the EC driver. | |
834 | */ | |
835 | static acpi_status | |
836 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 837 | u32 bits, u64 *value, |
bff431e4 CC |
838 | void *handler_context, void *region_context) |
839 | { | |
840 | int result = 0, i = 0; | |
841 | u8 temp = 0; | |
842 | ||
843 | if ((address > 0xFF) || !value) | |
844 | return AE_BAD_PARAMETER; | |
845 | ||
846 | if (function != ACPI_READ && function != ACPI_WRITE) | |
847 | return AE_BAD_PARAMETER; | |
848 | ||
849 | if (bits != 8) | |
850 | return AE_BAD_PARAMETER; | |
851 | ||
852 | if (function == ACPI_READ) { | |
853 | result = ec_read(address, &temp); | |
439913ff | 854 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
855 | } else { |
856 | temp = 0xff & ((*value) >> i); | |
857 | result = ec_write(address, temp); | |
858 | } | |
859 | ||
860 | switch (result) { | |
861 | case -EINVAL: | |
862 | return AE_BAD_PARAMETER; | |
863 | break; | |
864 | case -ENODEV: | |
865 | return AE_NOT_FOUND; | |
866 | break; | |
867 | case -ETIME: | |
868 | return AE_TIME; | |
869 | break; | |
870 | default: | |
871 | return AE_OK; | |
872 | } | |
873 | } | |
874 | ||
f61bb939 | 875 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
876 | { |
877 | struct guid_block *block; | |
878 | struct wmi_block *wblock; | |
879 | struct list_head *p; | |
7715348c | 880 | char guid_string[37]; |
bff431e4 | 881 | |
762e1a2f | 882 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
883 | wblock = list_entry(p, struct wmi_block, list); |
884 | block = &wblock->gblock; | |
885 | ||
886 | if ((block->flags & ACPI_WMI_EVENT) && | |
887 | (block->notify_id == event)) { | |
888 | if (wblock->handler) | |
889 | wblock->handler(event, wblock->handler_data); | |
7715348c TR |
890 | if (debug_event) { |
891 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
8e07514d | 892 | pr_info("DEBUG Event GUID: %s\n", guid_string); |
7715348c | 893 | } |
bff431e4 CC |
894 | |
895 | acpi_bus_generate_netlink_event( | |
0794469d | 896 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
897 | event, 0); |
898 | break; | |
899 | } | |
900 | } | |
901 | } | |
902 | ||
51fac838 | 903 | static int acpi_wmi_remove(struct acpi_device *device) |
bff431e4 | 904 | { |
bff431e4 CC |
905 | acpi_remove_address_space_handler(device->handle, |
906 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
c64eefd4 | 907 | wmi_free_devices(); |
bff431e4 CC |
908 | |
909 | return 0; | |
910 | } | |
911 | ||
925b1089 | 912 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
913 | { |
914 | acpi_status status; | |
c64eefd4 | 915 | int error; |
bff431e4 | 916 | |
bff431e4 CC |
917 | status = acpi_install_address_space_handler(device->handle, |
918 | ACPI_ADR_SPACE_EC, | |
919 | &acpi_wmi_ec_space_handler, | |
920 | NULL, NULL); | |
5212cd67 | 921 | if (ACPI_FAILURE(status)) { |
8e07514d | 922 | pr_err("Error installing EC region handler\n"); |
bff431e4 | 923 | return -ENODEV; |
5212cd67 | 924 | } |
bff431e4 | 925 | |
c64eefd4 DT |
926 | error = parse_wdg(device->handle); |
927 | if (error) { | |
5212cd67 DT |
928 | acpi_remove_address_space_handler(device->handle, |
929 | ACPI_ADR_SPACE_EC, | |
930 | &acpi_wmi_ec_space_handler); | |
8e07514d | 931 | pr_err("Failed to parse WDG method\n"); |
c64eefd4 | 932 | return error; |
bff431e4 CC |
933 | } |
934 | ||
c64eefd4 | 935 | return 0; |
bff431e4 CC |
936 | } |
937 | ||
938 | static int __init acpi_wmi_init(void) | |
939 | { | |
c64eefd4 | 940 | int error; |
bff431e4 CC |
941 | |
942 | if (acpi_disabled) | |
943 | return -ENODEV; | |
944 | ||
c64eefd4 DT |
945 | error = class_register(&wmi_class); |
946 | if (error) | |
947 | return error; | |
1caab3c1 | 948 | |
c64eefd4 DT |
949 | error = acpi_bus_register_driver(&acpi_wmi_driver); |
950 | if (error) { | |
951 | pr_err("Error loading mapper\n"); | |
952 | class_unregister(&wmi_class); | |
953 | return error; | |
bff431e4 CC |
954 | } |
955 | ||
8e07514d | 956 | pr_info("Mapper loaded\n"); |
8e07514d | 957 | return 0; |
bff431e4 CC |
958 | } |
959 | ||
960 | static void __exit acpi_wmi_exit(void) | |
961 | { | |
bff431e4 | 962 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
c64eefd4 | 963 | class_unregister(&wmi_class); |
bff431e4 | 964 | |
8e07514d | 965 | pr_info("Mapper unloaded\n"); |
bff431e4 CC |
966 | } |
967 | ||
968 | subsys_initcall(acpi_wmi_init); | |
969 | module_exit(acpi_wmi_exit); |