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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> | |
33 | #include <linux/list.h> | |
34 | #include <linux/acpi.h> | |
35 | #include <acpi/acpi_bus.h> | |
36 | #include <acpi/acpi_drivers.h> | |
37 | ||
38 | ACPI_MODULE_NAME("wmi"); | |
39 | MODULE_AUTHOR("Carlos Corbacho"); | |
40 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
41 | MODULE_LICENSE("GPL"); | |
42 | ||
43 | #define ACPI_WMI_CLASS "wmi" | |
44 | ||
45 | #undef PREFIX | |
46 | #define PREFIX "ACPI: WMI: " | |
47 | ||
48 | static DEFINE_MUTEX(wmi_data_lock); | |
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; | |
69 | }; | |
70 | ||
71 | static struct wmi_block wmi_blocks; | |
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 | ||
82 | static int acpi_wmi_remove(struct acpi_device *device, int type); | |
83 | static int acpi_wmi_add(struct acpi_device *device); | |
84 | ||
85 | static const struct acpi_device_id wmi_device_ids[] = { | |
86 | {"PNP0C14", 0}, | |
87 | {"pnp0c14", 0}, | |
88 | {"", 0}, | |
89 | }; | |
90 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
91 | ||
92 | static struct acpi_driver acpi_wmi_driver = { | |
93 | .name = "wmi", | |
94 | .class = ACPI_WMI_CLASS, | |
95 | .ids = wmi_device_ids, | |
96 | .ops = { | |
97 | .add = acpi_wmi_add, | |
98 | .remove = acpi_wmi_remove, | |
99 | }, | |
100 | }; | |
101 | ||
102 | /* | |
103 | * GUID parsing functions | |
104 | */ | |
105 | ||
106 | /** | |
107 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
108 | * @src: Pointer to at least 2 characters to convert. | |
109 | * | |
110 | * Convert a two character ASCII hex string to a number. | |
111 | * | |
112 | * Return: 0-255 Success, the byte was parsed correctly | |
113 | * -1 Error, an invalid character was supplied | |
114 | */ | |
115 | static int wmi_parse_hexbyte(const u8 *src) | |
116 | { | |
117 | unsigned int x; /* For correct wrapping */ | |
118 | int h; | |
119 | ||
120 | /* high part */ | |
121 | x = src[0]; | |
122 | if (x - '0' <= '9' - '0') { | |
123 | h = x - '0'; | |
124 | } else if (x - 'a' <= 'f' - 'a') { | |
125 | h = x - 'a' + 10; | |
126 | } else if (x - 'A' <= 'F' - 'A') { | |
127 | h = x - 'A' + 10; | |
128 | } else { | |
129 | return -1; | |
130 | } | |
131 | h <<= 4; | |
132 | ||
133 | /* low part */ | |
134 | x = src[1]; | |
135 | if (x - '0' <= '9' - '0') | |
136 | return h | (x - '0'); | |
137 | if (x - 'a' <= 'f' - 'a') | |
138 | return h | (x - 'a' + 10); | |
139 | if (x - 'A' <= 'F' - 'A') | |
140 | return h | (x - 'A' + 10); | |
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 | ||
197 | static bool find_guid(const char *guid_string, struct wmi_block **out) | |
198 | { | |
199 | char tmp[16], guid_input[16]; | |
200 | struct wmi_block *wblock; | |
201 | struct guid_block *block; | |
202 | struct list_head *p; | |
203 | ||
204 | wmi_parse_guid(guid_string, tmp); | |
205 | wmi_swap_bytes(tmp, guid_input); | |
206 | ||
207 | list_for_each(p, &wmi_blocks.list) { | |
208 | wblock = list_entry(p, struct wmi_block, list); | |
209 | block = &wblock->gblock; | |
210 | ||
211 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
212 | if (out) | |
213 | *out = wblock; | |
214 | return 1; | |
215 | } | |
216 | } | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Exported WMI functions | |
222 | */ | |
223 | /** | |
224 | * wmi_evaluate_method - Evaluate a WMI method | |
225 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
226 | * @instance: Instance index | |
227 | * @method_id: Method ID to call | |
228 | * &in: Buffer containing input for the method call | |
229 | * &out: Empty buffer to return the method results | |
230 | * | |
231 | * Call an ACPI-WMI method | |
232 | */ | |
233 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
234 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
235 | { | |
236 | struct guid_block *block = NULL; | |
237 | struct wmi_block *wblock = NULL; | |
238 | acpi_handle handle; | |
239 | acpi_status status; | |
240 | struct acpi_object_list input; | |
241 | union acpi_object params[3]; | |
242 | char method[4] = "WM"; | |
243 | ||
244 | if (!find_guid(guid_string, &wblock)) | |
245 | return AE_BAD_ADDRESS; | |
246 | ||
247 | block = &wblock->gblock; | |
248 | handle = wblock->handle; | |
249 | ||
e6bafba5 | 250 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
251 | return AE_BAD_DATA; |
252 | ||
253 | if (block->instance_count < instance) | |
254 | return AE_BAD_PARAMETER; | |
255 | ||
256 | input.count = 2; | |
257 | input.pointer = params; | |
258 | params[0].type = ACPI_TYPE_INTEGER; | |
259 | params[0].integer.value = instance; | |
260 | params[1].type = ACPI_TYPE_INTEGER; | |
261 | params[1].integer.value = method_id; | |
262 | ||
263 | if (in) { | |
264 | input.count = 3; | |
265 | ||
266 | if (block->flags & ACPI_WMI_STRING) { | |
267 | params[2].type = ACPI_TYPE_STRING; | |
268 | } else { | |
269 | params[2].type = ACPI_TYPE_BUFFER; | |
270 | } | |
271 | params[2].buffer.length = in->length; | |
272 | params[2].buffer.pointer = in->pointer; | |
273 | } | |
274 | ||
275 | strncat(method, block->object_id, 2); | |
276 | ||
277 | status = acpi_evaluate_object(handle, method, &input, out); | |
278 | ||
279 | return status; | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
282 | ||
283 | /** | |
284 | * wmi_query_block - Return contents of a WMI block | |
285 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
286 | * @instance: Instance index | |
287 | * &out: Empty buffer to return the contents of the data block to | |
288 | * | |
289 | * Return the contents of an ACPI-WMI data block to a buffer | |
290 | */ | |
291 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
292 | struct acpi_buffer *out) | |
293 | { | |
294 | struct guid_block *block = NULL; | |
295 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 296 | acpi_handle handle, wc_handle; |
bff431e4 CC |
297 | acpi_status status, wc_status = AE_ERROR; |
298 | struct acpi_object_list input, wc_input; | |
299 | union acpi_object wc_params[1], wq_params[1]; | |
300 | char method[4]; | |
301 | char wc_method[4] = "WC"; | |
302 | ||
303 | if (!guid_string || !out) | |
304 | return AE_BAD_PARAMETER; | |
305 | ||
306 | if (!find_guid(guid_string, &wblock)) | |
307 | return AE_BAD_ADDRESS; | |
308 | ||
309 | block = &wblock->gblock; | |
310 | handle = wblock->handle; | |
311 | ||
312 | if (block->instance_count < instance) | |
313 | return AE_BAD_PARAMETER; | |
314 | ||
315 | /* Check GUID is a data block */ | |
316 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
317 | return AE_BAD_ADDRESS; | |
318 | ||
319 | input.count = 1; | |
320 | input.pointer = wq_params; | |
321 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
322 | wq_params[0].integer.value = instance; | |
323 | ||
324 | /* | |
325 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
326 | * enable collection. | |
327 | */ | |
328 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
329 | wc_input.count = 1; | |
330 | wc_input.pointer = wc_params; | |
331 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
332 | wc_params[0].integer.value = 1; | |
333 | ||
334 | strncat(wc_method, block->object_id, 2); | |
335 | ||
336 | /* | |
337 | * Some GUIDs break the specification by declaring themselves | |
338 | * expensive, but have no corresponding WCxx method. So we | |
339 | * should not fail if this happens. | |
340 | */ | |
a527f2d7 CC |
341 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
342 | if (ACPI_SUCCESS(wc_status)) | |
343 | wc_status = acpi_evaluate_object(handle, wc_method, | |
344 | &wc_input, NULL); | |
bff431e4 CC |
345 | } |
346 | ||
347 | strcpy(method, "WQ"); | |
348 | strncat(method, block->object_id, 2); | |
349 | ||
dab36ad8 | 350 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
351 | |
352 | /* | |
353 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
354 | * the WQxx method failed - we should disable collection anyway. | |
355 | */ | |
a527f2d7 | 356 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
357 | wc_params[0].integer.value = 0; |
358 | status = acpi_evaluate_object(handle, | |
359 | wc_method, &wc_input, NULL); | |
360 | } | |
361 | ||
362 | return status; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
365 | ||
366 | /** | |
367 | * wmi_set_block - Write to a WMI block | |
368 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
369 | * @instance: Instance index | |
370 | * &in: Buffer containing new values for the data block | |
371 | * | |
372 | * Write the contents of the input buffer to an ACPI-WMI data block | |
373 | */ | |
374 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
375 | const struct acpi_buffer *in) | |
376 | { | |
377 | struct guid_block *block = NULL; | |
378 | struct wmi_block *wblock = NULL; | |
379 | acpi_handle handle; | |
380 | struct acpi_object_list input; | |
381 | union acpi_object params[2]; | |
382 | char method[4] = "WS"; | |
383 | ||
384 | if (!guid_string || !in) | |
385 | return AE_BAD_DATA; | |
386 | ||
387 | if (!find_guid(guid_string, &wblock)) | |
388 | return AE_BAD_ADDRESS; | |
389 | ||
390 | block = &wblock->gblock; | |
391 | handle = wblock->handle; | |
392 | ||
393 | if (block->instance_count < instance) | |
394 | return AE_BAD_PARAMETER; | |
395 | ||
396 | /* Check GUID is a data block */ | |
397 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
398 | return AE_BAD_ADDRESS; | |
399 | ||
400 | input.count = 2; | |
401 | input.pointer = params; | |
402 | params[0].type = ACPI_TYPE_INTEGER; | |
403 | params[0].integer.value = instance; | |
404 | ||
405 | if (block->flags & ACPI_WMI_STRING) { | |
406 | params[1].type = ACPI_TYPE_STRING; | |
407 | } else { | |
408 | params[1].type = ACPI_TYPE_BUFFER; | |
409 | } | |
410 | params[1].buffer.length = in->length; | |
411 | params[1].buffer.pointer = in->pointer; | |
412 | ||
413 | strncat(method, block->object_id, 2); | |
414 | ||
415 | return acpi_evaluate_object(handle, method, &input, NULL); | |
416 | } | |
417 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
418 | ||
419 | /** | |
420 | * wmi_install_notify_handler - Register handler for WMI events | |
421 | * @handler: Function to handle notifications | |
422 | * @data: Data to be returned to handler when event is fired | |
423 | * | |
424 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
425 | */ | |
426 | acpi_status wmi_install_notify_handler(const char *guid, | |
427 | wmi_notify_handler handler, void *data) | |
428 | { | |
429 | struct wmi_block *block; | |
430 | ||
431 | if (!guid || !handler) | |
432 | return AE_BAD_PARAMETER; | |
433 | ||
434 | find_guid(guid, &block); | |
435 | if (!block) | |
436 | return AE_NOT_EXIST; | |
437 | ||
438 | if (block->handler) | |
439 | return AE_ALREADY_ACQUIRED; | |
440 | ||
441 | block->handler = handler; | |
442 | block->handler_data = data; | |
443 | ||
444 | return AE_OK; | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
447 | ||
448 | /** | |
449 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
450 | * | |
451 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
452 | */ | |
453 | acpi_status wmi_remove_notify_handler(const char *guid) | |
454 | { | |
455 | struct wmi_block *block; | |
456 | ||
457 | if (!guid) | |
458 | return AE_BAD_PARAMETER; | |
459 | ||
460 | find_guid(guid, &block); | |
461 | if (!block) | |
462 | return AE_NOT_EXIST; | |
463 | ||
464 | if (!block->handler) | |
465 | return AE_NULL_ENTRY; | |
466 | ||
467 | block->handler = NULL; | |
468 | block->handler_data = NULL; | |
469 | ||
470 | return AE_OK; | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
473 | ||
474 | /** | |
475 | * wmi_get_event_data - Get WMI data associated with an event | |
476 | * | |
477 | * @event - Event to find | |
478 | * &out - Buffer to hold event data | |
479 | * | |
480 | * Returns extra data associated with an event in WMI. | |
481 | */ | |
482 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
483 | { | |
484 | struct acpi_object_list input; | |
485 | union acpi_object params[1]; | |
486 | struct guid_block *gblock; | |
487 | struct wmi_block *wblock; | |
488 | struct list_head *p; | |
489 | ||
490 | input.count = 1; | |
491 | input.pointer = params; | |
492 | params[0].type = ACPI_TYPE_INTEGER; | |
493 | params[0].integer.value = event; | |
494 | ||
495 | list_for_each(p, &wmi_blocks.list) { | |
496 | wblock = list_entry(p, struct wmi_block, list); | |
497 | gblock = &wblock->gblock; | |
498 | ||
499 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
500 | (gblock->notify_id == event)) | |
501 | return acpi_evaluate_object(wblock->handle, "_WED", | |
502 | &input, out); | |
503 | } | |
504 | ||
505 | return AE_NOT_FOUND; | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
508 | ||
509 | /** | |
510 | * wmi_has_guid - Check if a GUID is available | |
511 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
512 | * | |
513 | * Check if a given GUID is defined by _WDG | |
514 | */ | |
515 | bool wmi_has_guid(const char *guid_string) | |
516 | { | |
517 | return find_guid(guid_string, NULL); | |
518 | } | |
519 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
520 | ||
521 | /* | |
522 | * Parse the _WDG method for the GUID data blocks | |
523 | */ | |
524 | static __init acpi_status parse_wdg(acpi_handle handle) | |
525 | { | |
526 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
527 | union acpi_object *obj; | |
528 | struct guid_block *gblock; | |
529 | struct wmi_block *wblock; | |
530 | acpi_status status; | |
531 | u32 i, total; | |
532 | ||
533 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
534 | ||
535 | if (ACPI_FAILURE(status)) | |
536 | return status; | |
537 | ||
538 | obj = (union acpi_object *) out.pointer; | |
539 | ||
540 | if (obj->type != ACPI_TYPE_BUFFER) | |
541 | return AE_ERROR; | |
542 | ||
543 | total = obj->buffer.length / sizeof(struct guid_block); | |
544 | ||
545 | gblock = kzalloc(obj->buffer.length, GFP_KERNEL); | |
546 | if (!gblock) | |
547 | return AE_NO_MEMORY; | |
548 | ||
549 | memcpy(gblock, obj->buffer.pointer, obj->buffer.length); | |
550 | ||
551 | for (i = 0; i < total; i++) { | |
552 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
553 | if (!wblock) | |
554 | return AE_NO_MEMORY; | |
555 | ||
556 | wblock->gblock = gblock[i]; | |
557 | wblock->handle = handle; | |
558 | list_add_tail(&wblock->list, &wmi_blocks.list); | |
559 | } | |
560 | ||
561 | kfree(out.pointer); | |
562 | kfree(gblock); | |
563 | ||
564 | return status; | |
565 | } | |
566 | ||
567 | /* | |
568 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
569 | * hand these off to the EC driver. | |
570 | */ | |
571 | static acpi_status | |
572 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
573 | u32 bits, acpi_integer * value, | |
574 | void *handler_context, void *region_context) | |
575 | { | |
576 | int result = 0, i = 0; | |
577 | u8 temp = 0; | |
578 | ||
579 | if ((address > 0xFF) || !value) | |
580 | return AE_BAD_PARAMETER; | |
581 | ||
582 | if (function != ACPI_READ && function != ACPI_WRITE) | |
583 | return AE_BAD_PARAMETER; | |
584 | ||
585 | if (bits != 8) | |
586 | return AE_BAD_PARAMETER; | |
587 | ||
588 | if (function == ACPI_READ) { | |
589 | result = ec_read(address, &temp); | |
590 | (*value) |= ((acpi_integer)temp) << i; | |
591 | } else { | |
592 | temp = 0xff & ((*value) >> i); | |
593 | result = ec_write(address, temp); | |
594 | } | |
595 | ||
596 | switch (result) { | |
597 | case -EINVAL: | |
598 | return AE_BAD_PARAMETER; | |
599 | break; | |
600 | case -ENODEV: | |
601 | return AE_NOT_FOUND; | |
602 | break; | |
603 | case -ETIME: | |
604 | return AE_TIME; | |
605 | break; | |
606 | default: | |
607 | return AE_OK; | |
608 | } | |
609 | } | |
610 | ||
611 | static void acpi_wmi_notify(acpi_handle handle, u32 event, void *data) | |
612 | { | |
613 | struct guid_block *block; | |
614 | struct wmi_block *wblock; | |
615 | struct list_head *p; | |
616 | struct acpi_device *device = data; | |
617 | ||
618 | list_for_each(p, &wmi_blocks.list) { | |
619 | wblock = list_entry(p, struct wmi_block, list); | |
620 | block = &wblock->gblock; | |
621 | ||
622 | if ((block->flags & ACPI_WMI_EVENT) && | |
623 | (block->notify_id == event)) { | |
624 | if (wblock->handler) | |
625 | wblock->handler(event, wblock->handler_data); | |
626 | ||
627 | acpi_bus_generate_netlink_event( | |
628 | device->pnp.device_class, device->dev.bus_id, | |
629 | event, 0); | |
630 | break; | |
631 | } | |
632 | } | |
633 | } | |
634 | ||
635 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
636 | { | |
637 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
638 | acpi_wmi_notify); | |
639 | ||
640 | acpi_remove_address_space_handler(device->handle, | |
641 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static int __init acpi_wmi_add(struct acpi_device *device) | |
647 | { | |
648 | acpi_status status; | |
649 | int result = 0; | |
650 | ||
651 | status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
652 | acpi_wmi_notify, device); | |
653 | if (ACPI_FAILURE(status)) { | |
654 | printk(KERN_ERR PREFIX "Error installing notify handler\n"); | |
655 | return -ENODEV; | |
656 | } | |
657 | ||
658 | status = acpi_install_address_space_handler(device->handle, | |
659 | ACPI_ADR_SPACE_EC, | |
660 | &acpi_wmi_ec_space_handler, | |
661 | NULL, NULL); | |
662 | if (ACPI_FAILURE(status)) | |
663 | return -ENODEV; | |
664 | ||
665 | status = parse_wdg(device->handle); | |
666 | if (ACPI_FAILURE(status)) { | |
667 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
668 | return -ENODEV; | |
669 | } | |
670 | ||
671 | return result; | |
672 | } | |
673 | ||
674 | static int __init acpi_wmi_init(void) | |
675 | { | |
676 | acpi_status result; | |
677 | ||
96b5a46e LT |
678 | INIT_LIST_HEAD(&wmi_blocks.list); |
679 | ||
bff431e4 CC |
680 | if (acpi_disabled) |
681 | return -ENODEV; | |
682 | ||
bff431e4 CC |
683 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
684 | ||
685 | if (result < 0) { | |
686 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
687 | } else { | |
688 | printk(KERN_INFO PREFIX "Mapper loaded\n"); | |
689 | } | |
690 | ||
691 | return result; | |
692 | } | |
693 | ||
694 | static void __exit acpi_wmi_exit(void) | |
695 | { | |
696 | struct list_head *p, *tmp; | |
697 | struct wmi_block *wblock; | |
698 | ||
699 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
700 | ||
701 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
702 | wblock = list_entry(p, struct wmi_block, list); | |
703 | ||
704 | list_del(p); | |
705 | kfree(wblock); | |
706 | } | |
707 | ||
708 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
709 | } | |
710 | ||
711 | subsys_initcall(acpi_wmi_init); | |
712 | module_exit(acpi_wmi_exit); |