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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 | ||
30 | #include <linux/kernel.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/types.h> | |
1caab3c1 | 33 | #include <linux/device.h> |
bff431e4 CC |
34 | #include <linux/list.h> |
35 | #include <linux/acpi.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
bff431e4 CC |
37 | #include <acpi/acpi_bus.h> |
38 | #include <acpi/acpi_drivers.h> | |
39 | ||
40 | ACPI_MODULE_NAME("wmi"); | |
41 | MODULE_AUTHOR("Carlos Corbacho"); | |
42 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
43 | MODULE_LICENSE("GPL"); | |
44 | ||
45 | #define ACPI_WMI_CLASS "wmi" | |
46 | ||
bff431e4 CC |
47 | #define PREFIX "ACPI: WMI: " |
48 | ||
49 | static DEFINE_MUTEX(wmi_data_lock); | |
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; | |
1caab3c1 | 70 | struct device *dev; |
bff431e4 CC |
71 | }; |
72 | ||
73 | static struct wmi_block wmi_blocks; | |
74 | ||
75 | /* | |
76 | * If the GUID data block is marked as expensive, we must enable and | |
77 | * explicitily disable data collection. | |
78 | */ | |
79 | #define ACPI_WMI_EXPENSIVE 0x1 | |
80 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
81 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
82 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
83 | ||
fc3155b2 TR |
84 | static int debug_event; |
85 | module_param(debug_event, bool, 0444); | |
86 | MODULE_PARM_DESC(debug_event, | |
87 | "Log WMI Events [0/1]"); | |
88 | ||
a929aae0 TR |
89 | static int debug_dump_wdg; |
90 | module_param(debug_dump_wdg, bool, 0444); | |
91 | MODULE_PARM_DESC(debug_dump_wdg, | |
92 | "Dump available WMI interfaces [0/1]"); | |
93 | ||
bff431e4 CC |
94 | static int acpi_wmi_remove(struct acpi_device *device, int type); |
95 | static int acpi_wmi_add(struct acpi_device *device); | |
f61bb939 | 96 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
97 | |
98 | static const struct acpi_device_id wmi_device_ids[] = { | |
99 | {"PNP0C14", 0}, | |
100 | {"pnp0c14", 0}, | |
101 | {"", 0}, | |
102 | }; | |
103 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
104 | ||
105 | static struct acpi_driver acpi_wmi_driver = { | |
106 | .name = "wmi", | |
107 | .class = ACPI_WMI_CLASS, | |
108 | .ids = wmi_device_ids, | |
109 | .ops = { | |
110 | .add = acpi_wmi_add, | |
111 | .remove = acpi_wmi_remove, | |
f61bb939 | 112 | .notify = acpi_wmi_notify, |
bff431e4 CC |
113 | }, |
114 | }; | |
115 | ||
116 | /* | |
117 | * GUID parsing functions | |
118 | */ | |
119 | ||
120 | /** | |
121 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
122 | * @src: Pointer to at least 2 characters to convert. | |
123 | * | |
124 | * Convert a two character ASCII hex string to a number. | |
125 | * | |
126 | * Return: 0-255 Success, the byte was parsed correctly | |
127 | * -1 Error, an invalid character was supplied | |
128 | */ | |
129 | static int wmi_parse_hexbyte(const u8 *src) | |
130 | { | |
131 | unsigned int x; /* For correct wrapping */ | |
132 | int h; | |
133 | ||
134 | /* high part */ | |
135 | x = src[0]; | |
136 | if (x - '0' <= '9' - '0') { | |
137 | h = x - '0'; | |
138 | } else if (x - 'a' <= 'f' - 'a') { | |
139 | h = x - 'a' + 10; | |
140 | } else if (x - 'A' <= 'F' - 'A') { | |
141 | h = x - 'A' + 10; | |
142 | } else { | |
143 | return -1; | |
144 | } | |
145 | h <<= 4; | |
146 | ||
147 | /* low part */ | |
148 | x = src[1]; | |
149 | if (x - '0' <= '9' - '0') | |
150 | return h | (x - '0'); | |
151 | if (x - 'a' <= 'f' - 'a') | |
152 | return h | (x - 'a' + 10); | |
153 | if (x - 'A' <= 'F' - 'A') | |
154 | return h | (x - 'A' + 10); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | /** | |
159 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
160 | * @src: Memory block holding binary GUID (16 bytes) | |
161 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
162 | * | |
163 | * Byte swap a binary GUID to match it's real GUID value | |
164 | */ | |
165 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
166 | { | |
167 | int i; | |
168 | ||
169 | for (i = 0; i <= 3; i++) | |
170 | memcpy(dest + i, src + (3 - i), 1); | |
171 | ||
172 | for (i = 0; i <= 1; i++) | |
173 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
174 | ||
175 | for (i = 0; i <= 1; i++) | |
176 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
177 | ||
178 | memcpy(dest + 8, src + 8, 8); | |
179 | } | |
180 | ||
181 | /** | |
182 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
183 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
184 | * @dest: Memory block to hold binary GUID (16 bytes) | |
185 | * | |
186 | * N.B. The GUID need not be NULL terminated. | |
187 | * | |
188 | * Return: 'true' @dest contains binary GUID | |
189 | * 'false' @dest contents are undefined | |
190 | */ | |
191 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
192 | { | |
193 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
194 | int i, j, v; | |
195 | ||
196 | if (src[8] != '-' || src[13] != '-' || | |
197 | src[18] != '-' || src[23] != '-') | |
198 | return false; | |
199 | ||
200 | for (j = 0; j < 5; j++, src++) { | |
201 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
202 | v = wmi_parse_hexbyte(src); | |
203 | if (v < 0) | |
204 | return false; | |
205 | } | |
206 | } | |
207 | ||
208 | return true; | |
209 | } | |
210 | ||
1caab3c1 MG |
211 | /* |
212 | * Convert a raw GUID to the ACII string representation | |
213 | */ | |
214 | static int wmi_gtoa(const char *in, char *out) | |
215 | { | |
216 | int i; | |
217 | ||
218 | for (i = 3; i >= 0; i--) | |
219 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
220 | ||
221 | out += sprintf(out, "-"); | |
222 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
223 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
224 | out += sprintf(out, "-"); | |
225 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
226 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
227 | out += sprintf(out, "-"); | |
228 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
229 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
230 | out += sprintf(out, "-"); | |
231 | ||
232 | for (i = 10; i <= 15; i++) | |
233 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
234 | ||
235 | out = '\0'; | |
236 | return 0; | |
237 | } | |
238 | ||
bff431e4 CC |
239 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
240 | { | |
241 | char tmp[16], guid_input[16]; | |
242 | struct wmi_block *wblock; | |
243 | struct guid_block *block; | |
244 | struct list_head *p; | |
245 | ||
246 | wmi_parse_guid(guid_string, tmp); | |
247 | wmi_swap_bytes(tmp, guid_input); | |
248 | ||
249 | list_for_each(p, &wmi_blocks.list) { | |
250 | wblock = list_entry(p, struct wmi_block, list); | |
251 | block = &wblock->gblock; | |
252 | ||
253 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
254 | if (out) | |
255 | *out = wblock; | |
256 | return 1; | |
257 | } | |
258 | } | |
259 | return 0; | |
260 | } | |
261 | ||
a66bfa7a MG |
262 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
263 | { | |
264 | struct guid_block *block = NULL; | |
265 | char method[5]; | |
266 | struct acpi_object_list input; | |
267 | union acpi_object params[1]; | |
268 | acpi_status status; | |
269 | acpi_handle handle; | |
270 | ||
271 | block = &wblock->gblock; | |
272 | handle = wblock->handle; | |
273 | ||
274 | if (!block) | |
275 | return AE_NOT_EXIST; | |
276 | ||
277 | input.count = 1; | |
278 | input.pointer = params; | |
279 | params[0].type = ACPI_TYPE_INTEGER; | |
280 | params[0].integer.value = enable; | |
281 | ||
282 | snprintf(method, 5, "WE%02X", block->notify_id); | |
283 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
284 | ||
285 | if (status != AE_OK && status != AE_NOT_FOUND) | |
286 | return status; | |
287 | else | |
288 | return AE_OK; | |
289 | } | |
290 | ||
bff431e4 CC |
291 | /* |
292 | * Exported WMI functions | |
293 | */ | |
294 | /** | |
295 | * wmi_evaluate_method - Evaluate a WMI method | |
296 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
297 | * @instance: Instance index | |
298 | * @method_id: Method ID to call | |
299 | * &in: Buffer containing input for the method call | |
300 | * &out: Empty buffer to return the method results | |
301 | * | |
302 | * Call an ACPI-WMI method | |
303 | */ | |
304 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
305 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
306 | { | |
307 | struct guid_block *block = NULL; | |
308 | struct wmi_block *wblock = NULL; | |
309 | acpi_handle handle; | |
310 | acpi_status status; | |
311 | struct acpi_object_list input; | |
312 | union acpi_object params[3]; | |
f3d83e24 | 313 | char method[5] = "WM"; |
bff431e4 CC |
314 | |
315 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 316 | return AE_ERROR; |
bff431e4 CC |
317 | |
318 | block = &wblock->gblock; | |
319 | handle = wblock->handle; | |
320 | ||
e6bafba5 | 321 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
322 | return AE_BAD_DATA; |
323 | ||
324 | if (block->instance_count < instance) | |
325 | return AE_BAD_PARAMETER; | |
326 | ||
327 | input.count = 2; | |
328 | input.pointer = params; | |
329 | params[0].type = ACPI_TYPE_INTEGER; | |
330 | params[0].integer.value = instance; | |
331 | params[1].type = ACPI_TYPE_INTEGER; | |
332 | params[1].integer.value = method_id; | |
333 | ||
334 | if (in) { | |
335 | input.count = 3; | |
336 | ||
337 | if (block->flags & ACPI_WMI_STRING) { | |
338 | params[2].type = ACPI_TYPE_STRING; | |
339 | } else { | |
340 | params[2].type = ACPI_TYPE_BUFFER; | |
341 | } | |
342 | params[2].buffer.length = in->length; | |
343 | params[2].buffer.pointer = in->pointer; | |
344 | } | |
345 | ||
346 | strncat(method, block->object_id, 2); | |
347 | ||
348 | status = acpi_evaluate_object(handle, method, &input, out); | |
349 | ||
350 | return status; | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
353 | ||
354 | /** | |
355 | * wmi_query_block - Return contents of a WMI block | |
356 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
357 | * @instance: Instance index | |
358 | * &out: Empty buffer to return the contents of the data block to | |
359 | * | |
360 | * Return the contents of an ACPI-WMI data block to a buffer | |
361 | */ | |
362 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
363 | struct acpi_buffer *out) | |
364 | { | |
365 | struct guid_block *block = NULL; | |
366 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 367 | acpi_handle handle, wc_handle; |
bff431e4 CC |
368 | acpi_status status, wc_status = AE_ERROR; |
369 | struct acpi_object_list input, wc_input; | |
370 | union acpi_object wc_params[1], wq_params[1]; | |
f3d83e24 CL |
371 | char method[5]; |
372 | char wc_method[5] = "WC"; | |
bff431e4 CC |
373 | |
374 | if (!guid_string || !out) | |
375 | return AE_BAD_PARAMETER; | |
376 | ||
377 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 378 | return AE_ERROR; |
bff431e4 CC |
379 | |
380 | block = &wblock->gblock; | |
381 | handle = wblock->handle; | |
382 | ||
383 | if (block->instance_count < instance) | |
384 | return AE_BAD_PARAMETER; | |
385 | ||
386 | /* Check GUID is a data block */ | |
387 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 388 | return AE_ERROR; |
bff431e4 CC |
389 | |
390 | input.count = 1; | |
391 | input.pointer = wq_params; | |
392 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
393 | wq_params[0].integer.value = instance; | |
394 | ||
395 | /* | |
396 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
397 | * enable collection. | |
398 | */ | |
399 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
400 | wc_input.count = 1; | |
401 | wc_input.pointer = wc_params; | |
402 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
403 | wc_params[0].integer.value = 1; | |
404 | ||
405 | strncat(wc_method, block->object_id, 2); | |
406 | ||
407 | /* | |
408 | * Some GUIDs break the specification by declaring themselves | |
409 | * expensive, but have no corresponding WCxx method. So we | |
410 | * should not fail if this happens. | |
411 | */ | |
a527f2d7 CC |
412 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
413 | if (ACPI_SUCCESS(wc_status)) | |
414 | wc_status = acpi_evaluate_object(handle, wc_method, | |
415 | &wc_input, NULL); | |
bff431e4 CC |
416 | } |
417 | ||
418 | strcpy(method, "WQ"); | |
419 | strncat(method, block->object_id, 2); | |
420 | ||
dab36ad8 | 421 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
422 | |
423 | /* | |
424 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
425 | * the WQxx method failed - we should disable collection anyway. | |
426 | */ | |
a527f2d7 | 427 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
428 | wc_params[0].integer.value = 0; |
429 | status = acpi_evaluate_object(handle, | |
430 | wc_method, &wc_input, NULL); | |
431 | } | |
432 | ||
433 | return status; | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
436 | ||
437 | /** | |
438 | * wmi_set_block - Write to a WMI block | |
439 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
440 | * @instance: Instance index | |
441 | * &in: Buffer containing new values for the data block | |
442 | * | |
443 | * Write the contents of the input buffer to an ACPI-WMI data block | |
444 | */ | |
445 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
446 | const struct acpi_buffer *in) | |
447 | { | |
448 | struct guid_block *block = NULL; | |
449 | struct wmi_block *wblock = NULL; | |
450 | acpi_handle handle; | |
451 | struct acpi_object_list input; | |
452 | union acpi_object params[2]; | |
f3d83e24 | 453 | char method[5] = "WS"; |
bff431e4 CC |
454 | |
455 | if (!guid_string || !in) | |
456 | return AE_BAD_DATA; | |
457 | ||
458 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 459 | return AE_ERROR; |
bff431e4 CC |
460 | |
461 | block = &wblock->gblock; | |
462 | handle = wblock->handle; | |
463 | ||
464 | if (block->instance_count < instance) | |
465 | return AE_BAD_PARAMETER; | |
466 | ||
467 | /* Check GUID is a data block */ | |
468 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 469 | return AE_ERROR; |
bff431e4 CC |
470 | |
471 | input.count = 2; | |
472 | input.pointer = params; | |
473 | params[0].type = ACPI_TYPE_INTEGER; | |
474 | params[0].integer.value = instance; | |
475 | ||
476 | if (block->flags & ACPI_WMI_STRING) { | |
477 | params[1].type = ACPI_TYPE_STRING; | |
478 | } else { | |
479 | params[1].type = ACPI_TYPE_BUFFER; | |
480 | } | |
481 | params[1].buffer.length = in->length; | |
482 | params[1].buffer.pointer = in->pointer; | |
483 | ||
484 | strncat(method, block->object_id, 2); | |
485 | ||
486 | return acpi_evaluate_object(handle, method, &input, NULL); | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
489 | ||
a929aae0 TR |
490 | static void wmi_dump_wdg(struct guid_block *g) |
491 | { | |
492 | char guid_string[37]; | |
493 | ||
494 | wmi_gtoa(g->guid, guid_string); | |
495 | printk(KERN_INFO PREFIX "%s:\n", guid_string); | |
496 | printk(KERN_INFO PREFIX "\tobject_id: %c%c\n", | |
497 | g->object_id[0], g->object_id[1]); | |
498 | printk(KERN_INFO PREFIX "\tnotify_id: %02X\n", g->notify_id); | |
499 | printk(KERN_INFO PREFIX "\treserved: %02X\n", g->reserved); | |
500 | printk(KERN_INFO PREFIX "\tinstance_count: %d\n", g->instance_count); | |
501 | printk(KERN_INFO PREFIX "\tflags: %#x", g->flags); | |
502 | if (g->flags) { | |
503 | printk(" "); | |
504 | if (g->flags & ACPI_WMI_EXPENSIVE) | |
505 | printk("ACPI_WMI_EXPENSIVE "); | |
506 | if (g->flags & ACPI_WMI_METHOD) | |
507 | printk("ACPI_WMI_METHOD "); | |
508 | if (g->flags & ACPI_WMI_STRING) | |
509 | printk("ACPI_WMI_STRING "); | |
510 | if (g->flags & ACPI_WMI_EVENT) | |
511 | printk("ACPI_WMI_EVENT "); | |
512 | } | |
513 | printk("\n"); | |
514 | ||
515 | } | |
516 | ||
fc3155b2 TR |
517 | static void wmi_notify_debug(u32 value, void *context) |
518 | { | |
519 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
520 | union acpi_object *obj; | |
1492616a | 521 | acpi_status status; |
fc3155b2 | 522 | |
1492616a AL |
523 | status = wmi_get_event_data(value, &response); |
524 | if (status != AE_OK) { | |
525 | printk(KERN_INFO "wmi: bad event status 0x%x\n", status); | |
526 | return; | |
527 | } | |
fc3155b2 TR |
528 | |
529 | obj = (union acpi_object *)response.pointer; | |
530 | ||
531 | if (!obj) | |
532 | return; | |
533 | ||
534 | printk(KERN_INFO PREFIX "DEBUG Event "); | |
535 | switch(obj->type) { | |
536 | case ACPI_TYPE_BUFFER: | |
537 | printk("BUFFER_TYPE - length %d\n", obj->buffer.length); | |
538 | break; | |
539 | case ACPI_TYPE_STRING: | |
540 | printk("STRING_TYPE - %s\n", obj->string.pointer); | |
541 | break; | |
542 | case ACPI_TYPE_INTEGER: | |
543 | printk("INTEGER_TYPE - %llu\n", obj->integer.value); | |
544 | break; | |
545 | case ACPI_TYPE_PACKAGE: | |
546 | printk("PACKAGE_TYPE - %d elements\n", obj->package.count); | |
547 | break; | |
548 | default: | |
549 | printk("object type 0x%X\n", obj->type); | |
550 | } | |
1492616a | 551 | kfree(obj); |
fc3155b2 TR |
552 | } |
553 | ||
bff431e4 CC |
554 | /** |
555 | * wmi_install_notify_handler - Register handler for WMI events | |
556 | * @handler: Function to handle notifications | |
557 | * @data: Data to be returned to handler when event is fired | |
558 | * | |
559 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
560 | */ | |
561 | acpi_status wmi_install_notify_handler(const char *guid, | |
562 | wmi_notify_handler handler, void *data) | |
563 | { | |
564 | struct wmi_block *block; | |
a66bfa7a | 565 | acpi_status status; |
bff431e4 CC |
566 | |
567 | if (!guid || !handler) | |
568 | return AE_BAD_PARAMETER; | |
569 | ||
c03b26a5 | 570 | if (!find_guid(guid, &block)) |
bff431e4 CC |
571 | return AE_NOT_EXIST; |
572 | ||
fc3155b2 | 573 | if (block->handler && block->handler != wmi_notify_debug) |
bff431e4 CC |
574 | return AE_ALREADY_ACQUIRED; |
575 | ||
576 | block->handler = handler; | |
577 | block->handler_data = data; | |
578 | ||
a66bfa7a MG |
579 | status = wmi_method_enable(block, 1); |
580 | ||
581 | return status; | |
bff431e4 CC |
582 | } |
583 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
584 | ||
585 | /** | |
586 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
587 | * | |
588 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
589 | */ | |
590 | acpi_status wmi_remove_notify_handler(const char *guid) | |
591 | { | |
592 | struct wmi_block *block; | |
fc3155b2 | 593 | acpi_status status = AE_OK; |
bff431e4 CC |
594 | |
595 | if (!guid) | |
596 | return AE_BAD_PARAMETER; | |
597 | ||
c03b26a5 | 598 | if (!find_guid(guid, &block)) |
bff431e4 CC |
599 | return AE_NOT_EXIST; |
600 | ||
fc3155b2 | 601 | if (!block->handler || block->handler == wmi_notify_debug) |
bff431e4 CC |
602 | return AE_NULL_ENTRY; |
603 | ||
fc3155b2 TR |
604 | if (debug_event) { |
605 | block->handler = wmi_notify_debug; | |
606 | } else { | |
607 | status = wmi_method_enable(block, 0); | |
608 | block->handler = NULL; | |
609 | block->handler_data = NULL; | |
610 | } | |
a66bfa7a | 611 | return status; |
bff431e4 CC |
612 | } |
613 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
614 | ||
615 | /** | |
616 | * wmi_get_event_data - Get WMI data associated with an event | |
617 | * | |
3e9b988e AA |
618 | * @event: Event to find |
619 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
620 | * |
621 | * Returns extra data associated with an event in WMI. | |
622 | */ | |
623 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
624 | { | |
625 | struct acpi_object_list input; | |
626 | union acpi_object params[1]; | |
627 | struct guid_block *gblock; | |
628 | struct wmi_block *wblock; | |
629 | struct list_head *p; | |
630 | ||
631 | input.count = 1; | |
632 | input.pointer = params; | |
633 | params[0].type = ACPI_TYPE_INTEGER; | |
634 | params[0].integer.value = event; | |
635 | ||
636 | list_for_each(p, &wmi_blocks.list) { | |
637 | wblock = list_entry(p, struct wmi_block, list); | |
638 | gblock = &wblock->gblock; | |
639 | ||
640 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
641 | (gblock->notify_id == event)) | |
642 | return acpi_evaluate_object(wblock->handle, "_WED", | |
643 | &input, out); | |
644 | } | |
645 | ||
646 | return AE_NOT_FOUND; | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
649 | ||
650 | /** | |
651 | * wmi_has_guid - Check if a GUID is available | |
652 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
653 | * | |
654 | * Check if a given GUID is defined by _WDG | |
655 | */ | |
656 | bool wmi_has_guid(const char *guid_string) | |
657 | { | |
658 | return find_guid(guid_string, NULL); | |
659 | } | |
660 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
661 | ||
1caab3c1 MG |
662 | /* |
663 | * sysfs interface | |
664 | */ | |
665 | static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, | |
666 | char *buf) | |
667 | { | |
668 | char guid_string[37]; | |
669 | struct wmi_block *wblock; | |
670 | ||
671 | wblock = dev_get_drvdata(dev); | |
672 | if (!wblock) | |
673 | return -ENOMEM; | |
674 | ||
675 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
676 | ||
677 | return sprintf(buf, "wmi:%s\n", guid_string); | |
678 | } | |
679 | static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); | |
680 | ||
681 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
682 | { | |
683 | char guid_string[37]; | |
684 | ||
685 | struct wmi_block *wblock; | |
686 | ||
687 | if (add_uevent_var(env, "MODALIAS=")) | |
688 | return -ENOMEM; | |
689 | ||
690 | wblock = dev_get_drvdata(dev); | |
691 | if (!wblock) | |
692 | return -ENOMEM; | |
693 | ||
694 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
695 | ||
696 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
697 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
698 | env->buflen += 40; | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static void wmi_dev_free(struct device *dev) | |
704 | { | |
705 | kfree(dev); | |
706 | } | |
707 | ||
708 | static struct class wmi_class = { | |
709 | .name = "wmi", | |
710 | .dev_release = wmi_dev_free, | |
711 | .dev_uevent = wmi_dev_uevent, | |
712 | }; | |
713 | ||
714 | static int wmi_create_devs(void) | |
715 | { | |
716 | int result; | |
717 | char guid_string[37]; | |
718 | struct guid_block *gblock; | |
719 | struct wmi_block *wblock; | |
720 | struct list_head *p; | |
721 | struct device *guid_dev; | |
722 | ||
723 | /* Create devices for all the GUIDs */ | |
724 | list_for_each(p, &wmi_blocks.list) { | |
725 | wblock = list_entry(p, struct wmi_block, list); | |
726 | ||
727 | guid_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
728 | if (!guid_dev) | |
729 | return -ENOMEM; | |
730 | ||
731 | wblock->dev = guid_dev; | |
732 | ||
733 | guid_dev->class = &wmi_class; | |
734 | dev_set_drvdata(guid_dev, wblock); | |
735 | ||
736 | gblock = &wblock->gblock; | |
737 | ||
738 | wmi_gtoa(gblock->guid, guid_string); | |
739 | dev_set_name(guid_dev, guid_string); | |
740 | ||
741 | result = device_register(guid_dev); | |
742 | if (result) | |
743 | return result; | |
744 | ||
745 | result = device_create_file(guid_dev, &dev_attr_modalias); | |
746 | if (result) | |
747 | return result; | |
748 | } | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | static void wmi_remove_devs(void) | |
754 | { | |
755 | struct guid_block *gblock; | |
756 | struct wmi_block *wblock; | |
757 | struct list_head *p; | |
758 | struct device *guid_dev; | |
759 | ||
760 | /* Delete devices for all the GUIDs */ | |
761 | list_for_each(p, &wmi_blocks.list) { | |
762 | wblock = list_entry(p, struct wmi_block, list); | |
763 | ||
764 | guid_dev = wblock->dev; | |
765 | gblock = &wblock->gblock; | |
766 | ||
767 | device_remove_file(guid_dev, &dev_attr_modalias); | |
768 | ||
769 | device_unregister(guid_dev); | |
770 | } | |
771 | } | |
772 | ||
773 | static void wmi_class_exit(void) | |
774 | { | |
775 | wmi_remove_devs(); | |
776 | class_unregister(&wmi_class); | |
777 | } | |
778 | ||
779 | static int wmi_class_init(void) | |
780 | { | |
781 | int ret; | |
782 | ||
783 | ret = class_register(&wmi_class); | |
784 | if (ret) | |
785 | return ret; | |
786 | ||
787 | ret = wmi_create_devs(); | |
788 | if (ret) | |
789 | wmi_class_exit(); | |
790 | ||
791 | return ret; | |
792 | } | |
793 | ||
d1f9e497 CC |
794 | static bool guid_already_parsed(const char *guid_string) |
795 | { | |
796 | struct guid_block *gblock; | |
797 | struct wmi_block *wblock; | |
798 | struct list_head *p; | |
799 | ||
800 | list_for_each(p, &wmi_blocks.list) { | |
801 | wblock = list_entry(p, struct wmi_block, list); | |
802 | gblock = &wblock->gblock; | |
803 | ||
804 | if (strncmp(gblock->guid, guid_string, 16) == 0) | |
805 | return true; | |
806 | } | |
807 | return false; | |
808 | } | |
809 | ||
bff431e4 CC |
810 | /* |
811 | * Parse the _WDG method for the GUID data blocks | |
812 | */ | |
925b1089 | 813 | static acpi_status parse_wdg(acpi_handle handle) |
bff431e4 CC |
814 | { |
815 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
816 | union acpi_object *obj; | |
817 | struct guid_block *gblock; | |
818 | struct wmi_block *wblock; | |
d1f9e497 | 819 | char guid_string[37]; |
bff431e4 CC |
820 | acpi_status status; |
821 | u32 i, total; | |
822 | ||
823 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
824 | ||
825 | if (ACPI_FAILURE(status)) | |
826 | return status; | |
827 | ||
828 | obj = (union acpi_object *) out.pointer; | |
829 | ||
830 | if (obj->type != ACPI_TYPE_BUFFER) | |
831 | return AE_ERROR; | |
832 | ||
833 | total = obj->buffer.length / sizeof(struct guid_block); | |
834 | ||
2c6719a3 | 835 | gblock = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); |
a5167c5b AL |
836 | if (!gblock) { |
837 | status = AE_NO_MEMORY; | |
838 | goto out_free_pointer; | |
839 | } | |
bff431e4 | 840 | |
bff431e4 | 841 | for (i = 0; i < total; i++) { |
d1f9e497 CC |
842 | /* |
843 | Some WMI devices, like those for nVidia hooks, have a | |
844 | duplicate GUID. It's not clear what we should do in this | |
845 | case yet, so for now, we'll just ignore the duplicate. | |
846 | Anyone who wants to add support for that device can come | |
847 | up with a better workaround for the mess then. | |
848 | */ | |
849 | if (guid_already_parsed(gblock[i].guid) == true) { | |
850 | wmi_gtoa(gblock[i].guid, guid_string); | |
851 | printk(KERN_INFO PREFIX "Skipping duplicate GUID %s\n", | |
852 | guid_string); | |
853 | continue; | |
854 | } | |
a929aae0 TR |
855 | if (debug_dump_wdg) |
856 | wmi_dump_wdg(&gblock[i]); | |
857 | ||
bff431e4 | 858 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
a5167c5b AL |
859 | if (!wblock) { |
860 | status = AE_NO_MEMORY; | |
861 | goto out_free_gblock; | |
862 | } | |
bff431e4 CC |
863 | |
864 | wblock->gblock = gblock[i]; | |
865 | wblock->handle = handle; | |
fc3155b2 TR |
866 | if (debug_event) { |
867 | wblock->handler = wmi_notify_debug; | |
868 | status = wmi_method_enable(wblock, 1); | |
869 | } | |
bff431e4 CC |
870 | list_add_tail(&wblock->list, &wmi_blocks.list); |
871 | } | |
872 | ||
a5167c5b | 873 | out_free_gblock: |
bff431e4 | 874 | kfree(gblock); |
a5167c5b AL |
875 | out_free_pointer: |
876 | kfree(out.pointer); | |
bff431e4 CC |
877 | |
878 | return status; | |
879 | } | |
880 | ||
881 | /* | |
882 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
883 | * hand these off to the EC driver. | |
884 | */ | |
885 | static acpi_status | |
886 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 887 | u32 bits, u64 *value, |
bff431e4 CC |
888 | void *handler_context, void *region_context) |
889 | { | |
890 | int result = 0, i = 0; | |
891 | u8 temp = 0; | |
892 | ||
893 | if ((address > 0xFF) || !value) | |
894 | return AE_BAD_PARAMETER; | |
895 | ||
896 | if (function != ACPI_READ && function != ACPI_WRITE) | |
897 | return AE_BAD_PARAMETER; | |
898 | ||
899 | if (bits != 8) | |
900 | return AE_BAD_PARAMETER; | |
901 | ||
902 | if (function == ACPI_READ) { | |
903 | result = ec_read(address, &temp); | |
439913ff | 904 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
905 | } else { |
906 | temp = 0xff & ((*value) >> i); | |
907 | result = ec_write(address, temp); | |
908 | } | |
909 | ||
910 | switch (result) { | |
911 | case -EINVAL: | |
912 | return AE_BAD_PARAMETER; | |
913 | break; | |
914 | case -ENODEV: | |
915 | return AE_NOT_FOUND; | |
916 | break; | |
917 | case -ETIME: | |
918 | return AE_TIME; | |
919 | break; | |
920 | default: | |
921 | return AE_OK; | |
922 | } | |
923 | } | |
924 | ||
f61bb939 | 925 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
926 | { |
927 | struct guid_block *block; | |
928 | struct wmi_block *wblock; | |
929 | struct list_head *p; | |
7715348c | 930 | char guid_string[37]; |
bff431e4 CC |
931 | |
932 | list_for_each(p, &wmi_blocks.list) { | |
933 | wblock = list_entry(p, struct wmi_block, list); | |
934 | block = &wblock->gblock; | |
935 | ||
936 | if ((block->flags & ACPI_WMI_EVENT) && | |
937 | (block->notify_id == event)) { | |
938 | if (wblock->handler) | |
939 | wblock->handler(event, wblock->handler_data); | |
7715348c TR |
940 | if (debug_event) { |
941 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
942 | printk(KERN_INFO PREFIX "DEBUG Event GUID:" | |
943 | " %s\n", guid_string); | |
944 | } | |
bff431e4 CC |
945 | |
946 | acpi_bus_generate_netlink_event( | |
0794469d | 947 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
948 | event, 0); |
949 | break; | |
950 | } | |
951 | } | |
952 | } | |
953 | ||
954 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
955 | { | |
bff431e4 CC |
956 | acpi_remove_address_space_handler(device->handle, |
957 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
925b1089 | 962 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
963 | { |
964 | acpi_status status; | |
965 | int result = 0; | |
966 | ||
bff431e4 CC |
967 | status = acpi_install_address_space_handler(device->handle, |
968 | ACPI_ADR_SPACE_EC, | |
969 | &acpi_wmi_ec_space_handler, | |
970 | NULL, NULL); | |
971 | if (ACPI_FAILURE(status)) | |
972 | return -ENODEV; | |
973 | ||
974 | status = parse_wdg(device->handle); | |
975 | if (ACPI_FAILURE(status)) { | |
976 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
977 | return -ENODEV; | |
978 | } | |
979 | ||
980 | return result; | |
981 | } | |
982 | ||
983 | static int __init acpi_wmi_init(void) | |
984 | { | |
da511997 | 985 | int result; |
bff431e4 | 986 | |
96b5a46e LT |
987 | INIT_LIST_HEAD(&wmi_blocks.list); |
988 | ||
bff431e4 CC |
989 | if (acpi_disabled) |
990 | return -ENODEV; | |
991 | ||
bff431e4 CC |
992 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
993 | ||
994 | if (result < 0) { | |
995 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
1caab3c1 MG |
996 | return -ENODEV; |
997 | } | |
998 | ||
999 | result = wmi_class_init(); | |
1000 | if (result) { | |
1001 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
1002 | return result; | |
bff431e4 CC |
1003 | } |
1004 | ||
1caab3c1 MG |
1005 | printk(KERN_INFO PREFIX "Mapper loaded\n"); |
1006 | ||
bff431e4 CC |
1007 | return result; |
1008 | } | |
1009 | ||
1010 | static void __exit acpi_wmi_exit(void) | |
1011 | { | |
1012 | struct list_head *p, *tmp; | |
1013 | struct wmi_block *wblock; | |
1014 | ||
1caab3c1 MG |
1015 | wmi_class_exit(); |
1016 | ||
bff431e4 CC |
1017 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
1018 | ||
1019 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
1020 | wblock = list_entry(p, struct wmi_block, list); | |
1021 | ||
1022 | list_del(p); | |
1023 | kfree(wblock); | |
1024 | } | |
1025 | ||
1026 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
1027 | } | |
1028 | ||
1029 | subsys_initcall(acpi_wmi_init); | |
1030 | module_exit(acpi_wmi_exit); |