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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 | #include <acpi/acpi_bus.h> |
41 | #include <acpi/acpi_drivers.h> | |
42 | ||
43 | ACPI_MODULE_NAME("wmi"); | |
44 | MODULE_AUTHOR("Carlos Corbacho"); | |
45 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
46 | MODULE_LICENSE("GPL"); | |
47 | ||
48 | #define ACPI_WMI_CLASS "wmi" | |
49 | ||
bff431e4 | 50 | static DEFINE_MUTEX(wmi_data_lock); |
762e1a2f | 51 | static LIST_HEAD(wmi_block_list); |
bff431e4 CC |
52 | |
53 | struct guid_block { | |
54 | char guid[16]; | |
55 | union { | |
56 | char object_id[2]; | |
57 | struct { | |
58 | unsigned char notify_id; | |
59 | unsigned char reserved; | |
60 | }; | |
61 | }; | |
62 | u8 instance_count; | |
63 | u8 flags; | |
64 | }; | |
65 | ||
66 | struct wmi_block { | |
67 | struct list_head list; | |
68 | struct guid_block gblock; | |
69 | acpi_handle handle; | |
70 | wmi_notify_handler handler; | |
71 | void *handler_data; | |
c64eefd4 | 72 | struct device dev; |
bff431e4 CC |
73 | }; |
74 | ||
bff431e4 CC |
75 | |
76 | /* | |
77 | * If the GUID data block is marked as expensive, we must enable and | |
78 | * explicitily disable data collection. | |
79 | */ | |
80 | #define ACPI_WMI_EXPENSIVE 0x1 | |
81 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
82 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
83 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
84 | ||
90ab5ee9 | 85 | static bool debug_event; |
fc3155b2 TR |
86 | module_param(debug_event, bool, 0444); |
87 | MODULE_PARM_DESC(debug_event, | |
88 | "Log WMI Events [0/1]"); | |
89 | ||
90ab5ee9 | 90 | static bool debug_dump_wdg; |
a929aae0 TR |
91 | module_param(debug_dump_wdg, bool, 0444); |
92 | MODULE_PARM_DESC(debug_dump_wdg, | |
93 | "Dump available WMI interfaces [0/1]"); | |
94 | ||
51fac838 | 95 | static int acpi_wmi_remove(struct acpi_device *device); |
bff431e4 | 96 | static int acpi_wmi_add(struct acpi_device *device); |
f61bb939 | 97 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
98 | |
99 | static const struct acpi_device_id wmi_device_ids[] = { | |
100 | {"PNP0C14", 0}, | |
101 | {"pnp0c14", 0}, | |
102 | {"", 0}, | |
103 | }; | |
104 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
105 | ||
106 | static struct acpi_driver acpi_wmi_driver = { | |
107 | .name = "wmi", | |
108 | .class = ACPI_WMI_CLASS, | |
109 | .ids = wmi_device_ids, | |
110 | .ops = { | |
111 | .add = acpi_wmi_add, | |
112 | .remove = acpi_wmi_remove, | |
f61bb939 | 113 | .notify = acpi_wmi_notify, |
c64eefd4 | 114 | }, |
bff431e4 CC |
115 | }; |
116 | ||
117 | /* | |
118 | * GUID parsing functions | |
119 | */ | |
120 | ||
121 | /** | |
122 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
123 | * @src: Pointer to at least 2 characters to convert. | |
124 | * | |
125 | * Convert a two character ASCII hex string to a number. | |
126 | * | |
127 | * Return: 0-255 Success, the byte was parsed correctly | |
128 | * -1 Error, an invalid character was supplied | |
129 | */ | |
130 | static int wmi_parse_hexbyte(const u8 *src) | |
131 | { | |
bff431e4 | 132 | int h; |
392bd8b5 | 133 | int value; |
bff431e4 CC |
134 | |
135 | /* high part */ | |
392bd8b5 AS |
136 | h = value = hex_to_bin(src[0]); |
137 | if (value < 0) | |
bff431e4 | 138 | return -1; |
bff431e4 CC |
139 | |
140 | /* low part */ | |
392bd8b5 AS |
141 | value = hex_to_bin(src[1]); |
142 | if (value >= 0) | |
143 | return (h << 4) | value; | |
bff431e4 CC |
144 | return -1; |
145 | } | |
146 | ||
147 | /** | |
148 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
149 | * @src: Memory block holding binary GUID (16 bytes) | |
150 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
151 | * | |
152 | * Byte swap a binary GUID to match it's real GUID value | |
153 | */ | |
154 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
155 | { | |
156 | int i; | |
157 | ||
158 | for (i = 0; i <= 3; i++) | |
159 | memcpy(dest + i, src + (3 - i), 1); | |
160 | ||
161 | for (i = 0; i <= 1; i++) | |
162 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
163 | ||
164 | for (i = 0; i <= 1; i++) | |
165 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
166 | ||
167 | memcpy(dest + 8, src + 8, 8); | |
168 | } | |
169 | ||
170 | /** | |
171 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
172 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
173 | * @dest: Memory block to hold binary GUID (16 bytes) | |
174 | * | |
175 | * N.B. The GUID need not be NULL terminated. | |
176 | * | |
177 | * Return: 'true' @dest contains binary GUID | |
178 | * 'false' @dest contents are undefined | |
179 | */ | |
180 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
181 | { | |
182 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
183 | int i, j, v; | |
184 | ||
185 | if (src[8] != '-' || src[13] != '-' || | |
186 | src[18] != '-' || src[23] != '-') | |
187 | return false; | |
188 | ||
189 | for (j = 0; j < 5; j++, src++) { | |
190 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
191 | v = wmi_parse_hexbyte(src); | |
192 | if (v < 0) | |
193 | return false; | |
194 | } | |
195 | } | |
196 | ||
197 | return true; | |
198 | } | |
199 | ||
1caab3c1 MG |
200 | /* |
201 | * Convert a raw GUID to the ACII string representation | |
202 | */ | |
203 | static int wmi_gtoa(const char *in, char *out) | |
204 | { | |
205 | int i; | |
206 | ||
207 | for (i = 3; i >= 0; i--) | |
208 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
209 | ||
210 | out += sprintf(out, "-"); | |
211 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
212 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
213 | out += sprintf(out, "-"); | |
214 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
215 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
216 | out += sprintf(out, "-"); | |
217 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
218 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
219 | out += sprintf(out, "-"); | |
220 | ||
221 | for (i = 10; i <= 15; i++) | |
222 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
223 | ||
4e4304d7 | 224 | *out = '\0'; |
1caab3c1 MG |
225 | return 0; |
226 | } | |
227 | ||
bff431e4 CC |
228 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
229 | { | |
230 | char tmp[16], guid_input[16]; | |
231 | struct wmi_block *wblock; | |
232 | struct guid_block *block; | |
233 | struct list_head *p; | |
234 | ||
235 | wmi_parse_guid(guid_string, tmp); | |
236 | wmi_swap_bytes(tmp, guid_input); | |
237 | ||
762e1a2f | 238 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
239 | wblock = list_entry(p, struct wmi_block, list); |
240 | block = &wblock->gblock; | |
241 | ||
242 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
243 | if (out) | |
244 | *out = wblock; | |
245 | return 1; | |
246 | } | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
a66bfa7a MG |
251 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
252 | { | |
253 | struct guid_block *block = NULL; | |
254 | char method[5]; | |
a66bfa7a MG |
255 | acpi_status status; |
256 | acpi_handle handle; | |
257 | ||
258 | block = &wblock->gblock; | |
259 | handle = wblock->handle; | |
260 | ||
261 | if (!block) | |
262 | return AE_NOT_EXIST; | |
263 | ||
a66bfa7a MG |
264 | |
265 | snprintf(method, 5, "WE%02X", block->notify_id); | |
8122ab66 | 266 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
267 | |
268 | if (status != AE_OK && status != AE_NOT_FOUND) | |
269 | return status; | |
270 | else | |
271 | return AE_OK; | |
272 | } | |
273 | ||
bff431e4 CC |
274 | /* |
275 | * Exported WMI functions | |
276 | */ | |
277 | /** | |
278 | * wmi_evaluate_method - Evaluate a WMI method | |
279 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
280 | * @instance: Instance index | |
281 | * @method_id: Method ID to call | |
282 | * &in: Buffer containing input for the method call | |
283 | * &out: Empty buffer to return the method results | |
284 | * | |
285 | * Call an ACPI-WMI method | |
286 | */ | |
287 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
288 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
289 | { | |
290 | struct guid_block *block = NULL; | |
291 | struct wmi_block *wblock = NULL; | |
292 | acpi_handle handle; | |
293 | acpi_status status; | |
294 | struct acpi_object_list input; | |
295 | union acpi_object params[3]; | |
f3d83e24 | 296 | char method[5] = "WM"; |
bff431e4 CC |
297 | |
298 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 299 | return AE_ERROR; |
bff431e4 CC |
300 | |
301 | block = &wblock->gblock; | |
302 | handle = wblock->handle; | |
303 | ||
e6bafba5 | 304 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
305 | return AE_BAD_DATA; |
306 | ||
307 | if (block->instance_count < instance) | |
308 | return AE_BAD_PARAMETER; | |
309 | ||
310 | input.count = 2; | |
311 | input.pointer = params; | |
312 | params[0].type = ACPI_TYPE_INTEGER; | |
313 | params[0].integer.value = instance; | |
314 | params[1].type = ACPI_TYPE_INTEGER; | |
315 | params[1].integer.value = method_id; | |
316 | ||
317 | if (in) { | |
318 | input.count = 3; | |
319 | ||
320 | if (block->flags & ACPI_WMI_STRING) { | |
321 | params[2].type = ACPI_TYPE_STRING; | |
322 | } else { | |
323 | params[2].type = ACPI_TYPE_BUFFER; | |
324 | } | |
325 | params[2].buffer.length = in->length; | |
326 | params[2].buffer.pointer = in->pointer; | |
327 | } | |
328 | ||
329 | strncat(method, block->object_id, 2); | |
330 | ||
331 | status = acpi_evaluate_object(handle, method, &input, out); | |
332 | ||
333 | return status; | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
336 | ||
337 | /** | |
338 | * wmi_query_block - Return contents of a WMI block | |
339 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
340 | * @instance: Instance index | |
341 | * &out: Empty buffer to return the contents of the data block to | |
342 | * | |
343 | * Return the contents of an ACPI-WMI data block to a buffer | |
344 | */ | |
345 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
346 | struct acpi_buffer *out) | |
347 | { | |
348 | struct guid_block *block = NULL; | |
349 | struct wmi_block *wblock = NULL; | |
54f14c27 | 350 | acpi_handle handle; |
bff431e4 | 351 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
352 | struct acpi_object_list input; |
353 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
354 | char method[5]; |
355 | char wc_method[5] = "WC"; | |
bff431e4 CC |
356 | |
357 | if (!guid_string || !out) | |
358 | return AE_BAD_PARAMETER; | |
359 | ||
360 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 361 | return AE_ERROR; |
bff431e4 CC |
362 | |
363 | block = &wblock->gblock; | |
364 | handle = wblock->handle; | |
365 | ||
366 | if (block->instance_count < instance) | |
367 | return AE_BAD_PARAMETER; | |
368 | ||
369 | /* Check GUID is a data block */ | |
370 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 371 | return AE_ERROR; |
bff431e4 CC |
372 | |
373 | input.count = 1; | |
374 | input.pointer = wq_params; | |
375 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
376 | wq_params[0].integer.value = instance; | |
377 | ||
378 | /* | |
379 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
380 | * enable collection. | |
381 | */ | |
382 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
383 | strncat(wc_method, block->object_id, 2); |
384 | ||
385 | /* | |
386 | * Some GUIDs break the specification by declaring themselves | |
387 | * expensive, but have no corresponding WCxx method. So we | |
388 | * should not fail if this happens. | |
389 | */ | |
54f14c27 | 390 | if (acpi_has_method(handle, wc_method)) |
8122ab66 ZR |
391 | wc_status = acpi_execute_simple_method(handle, |
392 | wc_method, 1); | |
bff431e4 CC |
393 | } |
394 | ||
395 | strcpy(method, "WQ"); | |
396 | strncat(method, block->object_id, 2); | |
397 | ||
dab36ad8 | 398 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
399 | |
400 | /* | |
401 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
402 | * the WQxx method failed - we should disable collection anyway. | |
403 | */ | |
a527f2d7 | 404 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8122ab66 | 405 | status = acpi_execute_simple_method(handle, wc_method, 0); |
bff431e4 CC |
406 | } |
407 | ||
408 | return status; | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
411 | ||
412 | /** | |
413 | * wmi_set_block - Write to a WMI block | |
414 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
415 | * @instance: Instance index | |
416 | * &in: Buffer containing new values for the data block | |
417 | * | |
418 | * Write the contents of the input buffer to an ACPI-WMI data block | |
419 | */ | |
420 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
421 | const struct acpi_buffer *in) | |
422 | { | |
423 | struct guid_block *block = NULL; | |
424 | struct wmi_block *wblock = NULL; | |
425 | acpi_handle handle; | |
426 | struct acpi_object_list input; | |
427 | union acpi_object params[2]; | |
f3d83e24 | 428 | char method[5] = "WS"; |
bff431e4 CC |
429 | |
430 | if (!guid_string || !in) | |
431 | return AE_BAD_DATA; | |
432 | ||
433 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 434 | return AE_ERROR; |
bff431e4 CC |
435 | |
436 | block = &wblock->gblock; | |
437 | handle = wblock->handle; | |
438 | ||
439 | if (block->instance_count < instance) | |
440 | return AE_BAD_PARAMETER; | |
441 | ||
442 | /* Check GUID is a data block */ | |
443 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 444 | return AE_ERROR; |
bff431e4 CC |
445 | |
446 | input.count = 2; | |
447 | input.pointer = params; | |
448 | params[0].type = ACPI_TYPE_INTEGER; | |
449 | params[0].integer.value = instance; | |
450 | ||
451 | if (block->flags & ACPI_WMI_STRING) { | |
452 | params[1].type = ACPI_TYPE_STRING; | |
453 | } else { | |
454 | params[1].type = ACPI_TYPE_BUFFER; | |
455 | } | |
456 | params[1].buffer.length = in->length; | |
457 | params[1].buffer.pointer = in->pointer; | |
458 | ||
459 | strncat(method, block->object_id, 2); | |
460 | ||
461 | return acpi_evaluate_object(handle, method, &input, NULL); | |
462 | } | |
463 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
464 | ||
37830662 | 465 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 TR |
466 | { |
467 | char guid_string[37]; | |
468 | ||
469 | wmi_gtoa(g->guid, guid_string); | |
8e07514d DT |
470 | |
471 | pr_info("%s:\n", guid_string); | |
472 | pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]); | |
473 | pr_info("\tnotify_id: %02X\n", g->notify_id); | |
474 | pr_info("\treserved: %02X\n", g->reserved); | |
475 | pr_info("\tinstance_count: %d\n", g->instance_count); | |
dd8e908e | 476 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 477 | if (g->flags) { |
a929aae0 | 478 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 479 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 480 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 481 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 482 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 483 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 484 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 485 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 486 | } |
8e07514d | 487 | pr_cont("\n"); |
a929aae0 TR |
488 | |
489 | } | |
490 | ||
fc3155b2 TR |
491 | static void wmi_notify_debug(u32 value, void *context) |
492 | { | |
493 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
494 | union acpi_object *obj; | |
1492616a | 495 | acpi_status status; |
fc3155b2 | 496 | |
1492616a AL |
497 | status = wmi_get_event_data(value, &response); |
498 | if (status != AE_OK) { | |
8e07514d | 499 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
500 | return; |
501 | } | |
fc3155b2 TR |
502 | |
503 | obj = (union acpi_object *)response.pointer; | |
504 | ||
505 | if (!obj) | |
506 | return; | |
507 | ||
8e07514d | 508 | pr_info("DEBUG Event "); |
fc3155b2 TR |
509 | switch(obj->type) { |
510 | case ACPI_TYPE_BUFFER: | |
8e07514d | 511 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
512 | break; |
513 | case ACPI_TYPE_STRING: | |
8e07514d | 514 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
515 | break; |
516 | case ACPI_TYPE_INTEGER: | |
8e07514d | 517 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
518 | break; |
519 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 520 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
521 | break; |
522 | default: | |
8e07514d | 523 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 524 | } |
1492616a | 525 | kfree(obj); |
fc3155b2 TR |
526 | } |
527 | ||
bff431e4 CC |
528 | /** |
529 | * wmi_install_notify_handler - Register handler for WMI events | |
530 | * @handler: Function to handle notifications | |
531 | * @data: Data to be returned to handler when event is fired | |
532 | * | |
533 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
534 | */ | |
535 | acpi_status wmi_install_notify_handler(const char *guid, | |
536 | wmi_notify_handler handler, void *data) | |
537 | { | |
538 | struct wmi_block *block; | |
58f6425e CK |
539 | acpi_status status = AE_NOT_EXIST; |
540 | char tmp[16], guid_input[16]; | |
541 | struct list_head *p; | |
bff431e4 CC |
542 | |
543 | if (!guid || !handler) | |
544 | return AE_BAD_PARAMETER; | |
545 | ||
58f6425e CK |
546 | wmi_parse_guid(guid, tmp); |
547 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 548 | |
58f6425e CK |
549 | list_for_each(p, &wmi_block_list) { |
550 | acpi_status wmi_status; | |
551 | block = list_entry(p, struct wmi_block, list); | |
552 | ||
553 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
554 | if (block->handler && | |
555 | block->handler != wmi_notify_debug) | |
556 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 557 | |
58f6425e CK |
558 | block->handler = handler; |
559 | block->handler_data = data; | |
bff431e4 | 560 | |
58f6425e CK |
561 | wmi_status = wmi_method_enable(block, 1); |
562 | if ((wmi_status != AE_OK) || | |
563 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
564 | status = wmi_status; | |
565 | } | |
566 | } | |
a66bfa7a MG |
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; | |
58f6425e CK |
580 | acpi_status status = AE_NOT_EXIST; |
581 | char tmp[16], guid_input[16]; | |
582 | struct list_head *p; | |
bff431e4 CC |
583 | |
584 | if (!guid) | |
585 | return AE_BAD_PARAMETER; | |
586 | ||
58f6425e CK |
587 | wmi_parse_guid(guid, tmp); |
588 | wmi_swap_bytes(tmp, guid_input); | |
bff431e4 | 589 | |
58f6425e CK |
590 | list_for_each(p, &wmi_block_list) { |
591 | acpi_status wmi_status; | |
592 | block = list_entry(p, struct wmi_block, list); | |
593 | ||
594 | if (memcmp(block->gblock.guid, guid_input, 16) == 0) { | |
595 | if (!block->handler || | |
596 | block->handler == wmi_notify_debug) | |
597 | return AE_NULL_ENTRY; | |
598 | ||
599 | if (debug_event) { | |
600 | block->handler = wmi_notify_debug; | |
601 | status = AE_OK; | |
602 | } else { | |
603 | wmi_status = wmi_method_enable(block, 0); | |
604 | block->handler = NULL; | |
605 | block->handler_data = NULL; | |
606 | if ((wmi_status != AE_OK) || | |
607 | ((wmi_status == AE_OK) && | |
608 | (status == AE_NOT_EXIST))) | |
609 | status = wmi_status; | |
610 | } | |
611 | } | |
fc3155b2 | 612 | } |
58f6425e | 613 | |
a66bfa7a | 614 | return status; |
bff431e4 CC |
615 | } |
616 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
617 | ||
618 | /** | |
619 | * wmi_get_event_data - Get WMI data associated with an event | |
620 | * | |
3e9b988e AA |
621 | * @event: Event to find |
622 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
623 | * |
624 | * Returns extra data associated with an event in WMI. | |
625 | */ | |
626 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
627 | { | |
628 | struct acpi_object_list input; | |
629 | union acpi_object params[1]; | |
630 | struct guid_block *gblock; | |
631 | struct wmi_block *wblock; | |
632 | struct list_head *p; | |
633 | ||
634 | input.count = 1; | |
635 | input.pointer = params; | |
636 | params[0].type = ACPI_TYPE_INTEGER; | |
637 | params[0].integer.value = event; | |
638 | ||
762e1a2f | 639 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
640 | wblock = list_entry(p, struct wmi_block, list); |
641 | gblock = &wblock->gblock; | |
642 | ||
643 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
644 | (gblock->notify_id == event)) | |
645 | return acpi_evaluate_object(wblock->handle, "_WED", | |
646 | &input, out); | |
647 | } | |
648 | ||
649 | return AE_NOT_FOUND; | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
652 | ||
653 | /** | |
654 | * wmi_has_guid - Check if a GUID is available | |
655 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
656 | * | |
657 | * Check if a given GUID is defined by _WDG | |
658 | */ | |
659 | bool wmi_has_guid(const char *guid_string) | |
660 | { | |
661 | return find_guid(guid_string, NULL); | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
664 | ||
1caab3c1 MG |
665 | /* |
666 | * sysfs interface | |
667 | */ | |
614ef432 | 668 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
669 | char *buf) |
670 | { | |
671 | char guid_string[37]; | |
672 | struct wmi_block *wblock; | |
673 | ||
674 | wblock = dev_get_drvdata(dev); | |
675 | if (!wblock) | |
676 | return -ENOMEM; | |
677 | ||
678 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
679 | ||
680 | return sprintf(buf, "wmi:%s\n", guid_string); | |
681 | } | |
e80b89a5 | 682 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 683 | |
e80b89a5 GKH |
684 | static struct attribute *wmi_attrs[] = { |
685 | &dev_attr_modalias.attr, | |
686 | NULL, | |
614ef432 | 687 | }; |
e80b89a5 | 688 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 MG |
689 | |
690 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
691 | { | |
692 | char guid_string[37]; | |
693 | ||
694 | struct wmi_block *wblock; | |
695 | ||
696 | if (add_uevent_var(env, "MODALIAS=")) | |
697 | return -ENOMEM; | |
698 | ||
699 | wblock = dev_get_drvdata(dev); | |
700 | if (!wblock) | |
701 | return -ENOMEM; | |
702 | ||
703 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
704 | ||
705 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
706 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
707 | env->buflen += 40; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | static void wmi_dev_free(struct device *dev) | |
713 | { | |
c64eefd4 DT |
714 | struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev); |
715 | ||
716 | kfree(wmi_block); | |
1caab3c1 MG |
717 | } |
718 | ||
719 | static struct class wmi_class = { | |
720 | .name = "wmi", | |
721 | .dev_release = wmi_dev_free, | |
722 | .dev_uevent = wmi_dev_uevent, | |
e80b89a5 | 723 | .dev_groups = wmi_groups, |
1caab3c1 MG |
724 | }; |
725 | ||
58f6425e CK |
726 | static int wmi_create_device(const struct guid_block *gblock, |
727 | struct wmi_block *wblock, acpi_handle handle) | |
1caab3c1 | 728 | { |
c64eefd4 | 729 | char guid_string[37]; |
1caab3c1 | 730 | |
c64eefd4 | 731 | wblock->dev.class = &wmi_class; |
1caab3c1 | 732 | |
c64eefd4 | 733 | wmi_gtoa(gblock->guid, guid_string); |
02aa2a37 | 734 | dev_set_name(&wblock->dev, "%s", guid_string); |
1caab3c1 | 735 | |
c64eefd4 | 736 | dev_set_drvdata(&wblock->dev, wblock); |
1caab3c1 | 737 | |
58f6425e | 738 | return device_register(&wblock->dev); |
1caab3c1 MG |
739 | } |
740 | ||
c64eefd4 | 741 | static void wmi_free_devices(void) |
1caab3c1 | 742 | { |
c64eefd4 | 743 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
744 | |
745 | /* Delete devices for all the GUIDs */ | |
023b9565 DT |
746 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
747 | list_del(&wblock->list); | |
58f6425e CK |
748 | if (wblock->dev.class) |
749 | device_unregister(&wblock->dev); | |
023b9565 DT |
750 | else |
751 | kfree(wblock); | |
752 | } | |
1caab3c1 MG |
753 | } |
754 | ||
d1f9e497 CC |
755 | static bool guid_already_parsed(const char *guid_string) |
756 | { | |
d1f9e497 | 757 | struct wmi_block *wblock; |
d1f9e497 | 758 | |
c64eefd4 | 759 | list_for_each_entry(wblock, &wmi_block_list, list) |
8b14d7b2 | 760 | if (memcmp(wblock->gblock.guid, guid_string, 16) == 0) |
d1f9e497 | 761 | return true; |
d1f9e497 | 762 | |
c64eefd4 | 763 | return false; |
2d5ab555 DT |
764 | } |
765 | ||
bff431e4 CC |
766 | /* |
767 | * Parse the _WDG method for the GUID data blocks | |
768 | */ | |
0a018a68 | 769 | static int parse_wdg(acpi_handle handle) |
bff431e4 CC |
770 | { |
771 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
772 | union acpi_object *obj; | |
37830662 | 773 | const struct guid_block *gblock; |
bff431e4 CC |
774 | struct wmi_block *wblock; |
775 | acpi_status status; | |
c64eefd4 | 776 | int retval; |
bff431e4 CC |
777 | u32 i, total; |
778 | ||
779 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
bff431e4 | 780 | if (ACPI_FAILURE(status)) |
c64eefd4 | 781 | return -ENXIO; |
bff431e4 CC |
782 | |
783 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 784 | if (!obj) |
c64eefd4 | 785 | return -ENXIO; |
bff431e4 | 786 | |
64ed0ab8 | 787 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 788 | retval = -ENXIO; |
64ed0ab8 DT |
789 | goto out_free_pointer; |
790 | } | |
bff431e4 | 791 | |
37830662 | 792 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
793 | total = obj->buffer.length / sizeof(struct guid_block); |
794 | ||
bff431e4 | 795 | for (i = 0; i < total; i++) { |
58f6425e CK |
796 | if (debug_dump_wdg) |
797 | wmi_dump_wdg(&gblock[i]); | |
798 | ||
799 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
800 | if (!wblock) | |
0a018a68 | 801 | return -ENOMEM; |
58f6425e CK |
802 | |
803 | wblock->handle = handle; | |
804 | wblock->gblock = gblock[i]; | |
805 | ||
d1f9e497 CC |
806 | /* |
807 | Some WMI devices, like those for nVidia hooks, have a | |
808 | duplicate GUID. It's not clear what we should do in this | |
58f6425e CK |
809 | case yet, so for now, we'll just ignore the duplicate |
810 | for device creation. | |
d1f9e497 | 811 | */ |
58f6425e CK |
812 | if (!guid_already_parsed(gblock[i].guid)) { |
813 | retval = wmi_create_device(&gblock[i], wblock, handle); | |
814 | if (retval) { | |
815 | wmi_free_devices(); | |
e1e0dacb | 816 | goto out_free_pointer; |
58f6425e | 817 | } |
d1f9e497 | 818 | } |
c64eefd4 | 819 | |
58f6425e | 820 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 821 | |
fc3155b2 TR |
822 | if (debug_event) { |
823 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 824 | wmi_method_enable(wblock, 1); |
fc3155b2 | 825 | } |
bff431e4 CC |
826 | } |
827 | ||
c64eefd4 DT |
828 | retval = 0; |
829 | ||
a5167c5b AL |
830 | out_free_pointer: |
831 | kfree(out.pointer); | |
bff431e4 | 832 | |
c64eefd4 | 833 | return retval; |
bff431e4 CC |
834 | } |
835 | ||
836 | /* | |
837 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
838 | * hand these off to the EC driver. | |
839 | */ | |
840 | static acpi_status | |
841 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 842 | u32 bits, u64 *value, |
bff431e4 CC |
843 | void *handler_context, void *region_context) |
844 | { | |
845 | int result = 0, i = 0; | |
846 | u8 temp = 0; | |
847 | ||
848 | if ((address > 0xFF) || !value) | |
849 | return AE_BAD_PARAMETER; | |
850 | ||
851 | if (function != ACPI_READ && function != ACPI_WRITE) | |
852 | return AE_BAD_PARAMETER; | |
853 | ||
854 | if (bits != 8) | |
855 | return AE_BAD_PARAMETER; | |
856 | ||
857 | if (function == ACPI_READ) { | |
858 | result = ec_read(address, &temp); | |
439913ff | 859 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
860 | } else { |
861 | temp = 0xff & ((*value) >> i); | |
862 | result = ec_write(address, temp); | |
863 | } | |
864 | ||
865 | switch (result) { | |
866 | case -EINVAL: | |
867 | return AE_BAD_PARAMETER; | |
868 | break; | |
869 | case -ENODEV: | |
870 | return AE_NOT_FOUND; | |
871 | break; | |
872 | case -ETIME: | |
873 | return AE_TIME; | |
874 | break; | |
875 | default: | |
876 | return AE_OK; | |
877 | } | |
878 | } | |
879 | ||
f61bb939 | 880 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
881 | { |
882 | struct guid_block *block; | |
883 | struct wmi_block *wblock; | |
884 | struct list_head *p; | |
7715348c | 885 | char guid_string[37]; |
bff431e4 | 886 | |
762e1a2f | 887 | list_for_each(p, &wmi_block_list) { |
bff431e4 CC |
888 | wblock = list_entry(p, struct wmi_block, list); |
889 | block = &wblock->gblock; | |
890 | ||
891 | if ((block->flags & ACPI_WMI_EVENT) && | |
892 | (block->notify_id == event)) { | |
893 | if (wblock->handler) | |
894 | wblock->handler(event, wblock->handler_data); | |
7715348c TR |
895 | if (debug_event) { |
896 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
8e07514d | 897 | pr_info("DEBUG Event GUID: %s\n", guid_string); |
7715348c | 898 | } |
bff431e4 CC |
899 | |
900 | acpi_bus_generate_netlink_event( | |
0794469d | 901 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
902 | event, 0); |
903 | break; | |
904 | } | |
905 | } | |
906 | } | |
907 | ||
51fac838 | 908 | static int acpi_wmi_remove(struct acpi_device *device) |
bff431e4 | 909 | { |
bff431e4 CC |
910 | acpi_remove_address_space_handler(device->handle, |
911 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
c64eefd4 | 912 | wmi_free_devices(); |
bff431e4 CC |
913 | |
914 | return 0; | |
915 | } | |
916 | ||
925b1089 | 917 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
918 | { |
919 | acpi_status status; | |
c64eefd4 | 920 | int error; |
bff431e4 | 921 | |
bff431e4 CC |
922 | status = acpi_install_address_space_handler(device->handle, |
923 | ACPI_ADR_SPACE_EC, | |
924 | &acpi_wmi_ec_space_handler, | |
925 | NULL, NULL); | |
5212cd67 | 926 | if (ACPI_FAILURE(status)) { |
8e07514d | 927 | pr_err("Error installing EC region handler\n"); |
bff431e4 | 928 | return -ENODEV; |
5212cd67 | 929 | } |
bff431e4 | 930 | |
c64eefd4 DT |
931 | error = parse_wdg(device->handle); |
932 | if (error) { | |
5212cd67 DT |
933 | acpi_remove_address_space_handler(device->handle, |
934 | ACPI_ADR_SPACE_EC, | |
935 | &acpi_wmi_ec_space_handler); | |
8e07514d | 936 | pr_err("Failed to parse WDG method\n"); |
c64eefd4 | 937 | return error; |
bff431e4 CC |
938 | } |
939 | ||
c64eefd4 | 940 | return 0; |
bff431e4 CC |
941 | } |
942 | ||
943 | static int __init acpi_wmi_init(void) | |
944 | { | |
c64eefd4 | 945 | int error; |
bff431e4 CC |
946 | |
947 | if (acpi_disabled) | |
948 | return -ENODEV; | |
949 | ||
c64eefd4 DT |
950 | error = class_register(&wmi_class); |
951 | if (error) | |
952 | return error; | |
1caab3c1 | 953 | |
c64eefd4 DT |
954 | error = acpi_bus_register_driver(&acpi_wmi_driver); |
955 | if (error) { | |
956 | pr_err("Error loading mapper\n"); | |
957 | class_unregister(&wmi_class); | |
958 | return error; | |
bff431e4 CC |
959 | } |
960 | ||
8e07514d | 961 | pr_info("Mapper loaded\n"); |
8e07514d | 962 | return 0; |
bff431e4 CC |
963 | } |
964 | ||
965 | static void __exit acpi_wmi_exit(void) | |
966 | { | |
bff431e4 | 967 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
c64eefd4 | 968 | class_unregister(&wmi_class); |
bff431e4 | 969 | |
8e07514d | 970 | pr_info("Mapper unloaded\n"); |
bff431e4 CC |
971 | } |
972 | ||
973 | subsys_initcall(acpi_wmi_init); | |
974 | module_exit(acpi_wmi_exit); |