]>
Commit | Line | Data |
---|---|---|
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> | |
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 | ||
a66bfa7a MG |
220 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
221 | { | |
222 | struct guid_block *block = NULL; | |
223 | char method[5]; | |
224 | struct acpi_object_list input; | |
225 | union acpi_object params[1]; | |
226 | acpi_status status; | |
227 | acpi_handle handle; | |
228 | ||
229 | block = &wblock->gblock; | |
230 | handle = wblock->handle; | |
231 | ||
232 | if (!block) | |
233 | return AE_NOT_EXIST; | |
234 | ||
235 | input.count = 1; | |
236 | input.pointer = params; | |
237 | params[0].type = ACPI_TYPE_INTEGER; | |
238 | params[0].integer.value = enable; | |
239 | ||
240 | snprintf(method, 5, "WE%02X", block->notify_id); | |
241 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
242 | ||
243 | if (status != AE_OK && status != AE_NOT_FOUND) | |
244 | return status; | |
245 | else | |
246 | return AE_OK; | |
247 | } | |
248 | ||
bff431e4 CC |
249 | /* |
250 | * Exported WMI functions | |
251 | */ | |
252 | /** | |
253 | * wmi_evaluate_method - Evaluate a WMI method | |
254 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
255 | * @instance: Instance index | |
256 | * @method_id: Method ID to call | |
257 | * &in: Buffer containing input for the method call | |
258 | * &out: Empty buffer to return the method results | |
259 | * | |
260 | * Call an ACPI-WMI method | |
261 | */ | |
262 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
263 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
264 | { | |
265 | struct guid_block *block = NULL; | |
266 | struct wmi_block *wblock = NULL; | |
267 | acpi_handle handle; | |
268 | acpi_status status; | |
269 | struct acpi_object_list input; | |
270 | union acpi_object params[3]; | |
271 | char method[4] = "WM"; | |
272 | ||
273 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 274 | return AE_ERROR; |
bff431e4 CC |
275 | |
276 | block = &wblock->gblock; | |
277 | handle = wblock->handle; | |
278 | ||
e6bafba5 | 279 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
280 | return AE_BAD_DATA; |
281 | ||
282 | if (block->instance_count < instance) | |
283 | return AE_BAD_PARAMETER; | |
284 | ||
285 | input.count = 2; | |
286 | input.pointer = params; | |
287 | params[0].type = ACPI_TYPE_INTEGER; | |
288 | params[0].integer.value = instance; | |
289 | params[1].type = ACPI_TYPE_INTEGER; | |
290 | params[1].integer.value = method_id; | |
291 | ||
292 | if (in) { | |
293 | input.count = 3; | |
294 | ||
295 | if (block->flags & ACPI_WMI_STRING) { | |
296 | params[2].type = ACPI_TYPE_STRING; | |
297 | } else { | |
298 | params[2].type = ACPI_TYPE_BUFFER; | |
299 | } | |
300 | params[2].buffer.length = in->length; | |
301 | params[2].buffer.pointer = in->pointer; | |
302 | } | |
303 | ||
304 | strncat(method, block->object_id, 2); | |
305 | ||
306 | status = acpi_evaluate_object(handle, method, &input, out); | |
307 | ||
308 | return status; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
311 | ||
312 | /** | |
313 | * wmi_query_block - Return contents of a WMI block | |
314 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
315 | * @instance: Instance index | |
316 | * &out: Empty buffer to return the contents of the data block to | |
317 | * | |
318 | * Return the contents of an ACPI-WMI data block to a buffer | |
319 | */ | |
320 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
321 | struct acpi_buffer *out) | |
322 | { | |
323 | struct guid_block *block = NULL; | |
324 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 325 | acpi_handle handle, wc_handle; |
bff431e4 CC |
326 | acpi_status status, wc_status = AE_ERROR; |
327 | struct acpi_object_list input, wc_input; | |
328 | union acpi_object wc_params[1], wq_params[1]; | |
329 | char method[4]; | |
330 | char wc_method[4] = "WC"; | |
331 | ||
332 | if (!guid_string || !out) | |
333 | return AE_BAD_PARAMETER; | |
334 | ||
335 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 336 | return AE_ERROR; |
bff431e4 CC |
337 | |
338 | block = &wblock->gblock; | |
339 | handle = wblock->handle; | |
340 | ||
341 | if (block->instance_count < instance) | |
342 | return AE_BAD_PARAMETER; | |
343 | ||
344 | /* Check GUID is a data block */ | |
345 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 346 | return AE_ERROR; |
bff431e4 CC |
347 | |
348 | input.count = 1; | |
349 | input.pointer = wq_params; | |
350 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
351 | wq_params[0].integer.value = instance; | |
352 | ||
353 | /* | |
354 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
355 | * enable collection. | |
356 | */ | |
357 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
358 | wc_input.count = 1; | |
359 | wc_input.pointer = wc_params; | |
360 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
361 | wc_params[0].integer.value = 1; | |
362 | ||
363 | strncat(wc_method, block->object_id, 2); | |
364 | ||
365 | /* | |
366 | * Some GUIDs break the specification by declaring themselves | |
367 | * expensive, but have no corresponding WCxx method. So we | |
368 | * should not fail if this happens. | |
369 | */ | |
a527f2d7 CC |
370 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
371 | if (ACPI_SUCCESS(wc_status)) | |
372 | wc_status = acpi_evaluate_object(handle, wc_method, | |
373 | &wc_input, NULL); | |
bff431e4 CC |
374 | } |
375 | ||
376 | strcpy(method, "WQ"); | |
377 | strncat(method, block->object_id, 2); | |
378 | ||
dab36ad8 | 379 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
380 | |
381 | /* | |
382 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
383 | * the WQxx method failed - we should disable collection anyway. | |
384 | */ | |
a527f2d7 | 385 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
386 | wc_params[0].integer.value = 0; |
387 | status = acpi_evaluate_object(handle, | |
388 | wc_method, &wc_input, NULL); | |
389 | } | |
390 | ||
391 | return status; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
394 | ||
395 | /** | |
396 | * wmi_set_block - Write to a WMI block | |
397 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
398 | * @instance: Instance index | |
399 | * &in: Buffer containing new values for the data block | |
400 | * | |
401 | * Write the contents of the input buffer to an ACPI-WMI data block | |
402 | */ | |
403 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
404 | const struct acpi_buffer *in) | |
405 | { | |
406 | struct guid_block *block = NULL; | |
407 | struct wmi_block *wblock = NULL; | |
408 | acpi_handle handle; | |
409 | struct acpi_object_list input; | |
410 | union acpi_object params[2]; | |
411 | char method[4] = "WS"; | |
412 | ||
413 | if (!guid_string || !in) | |
414 | return AE_BAD_DATA; | |
415 | ||
416 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 417 | return AE_ERROR; |
bff431e4 CC |
418 | |
419 | block = &wblock->gblock; | |
420 | handle = wblock->handle; | |
421 | ||
422 | if (block->instance_count < instance) | |
423 | return AE_BAD_PARAMETER; | |
424 | ||
425 | /* Check GUID is a data block */ | |
426 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 427 | return AE_ERROR; |
bff431e4 CC |
428 | |
429 | input.count = 2; | |
430 | input.pointer = params; | |
431 | params[0].type = ACPI_TYPE_INTEGER; | |
432 | params[0].integer.value = instance; | |
433 | ||
434 | if (block->flags & ACPI_WMI_STRING) { | |
435 | params[1].type = ACPI_TYPE_STRING; | |
436 | } else { | |
437 | params[1].type = ACPI_TYPE_BUFFER; | |
438 | } | |
439 | params[1].buffer.length = in->length; | |
440 | params[1].buffer.pointer = in->pointer; | |
441 | ||
442 | strncat(method, block->object_id, 2); | |
443 | ||
444 | return acpi_evaluate_object(handle, method, &input, NULL); | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
447 | ||
448 | /** | |
449 | * wmi_install_notify_handler - Register handler for WMI events | |
450 | * @handler: Function to handle notifications | |
451 | * @data: Data to be returned to handler when event is fired | |
452 | * | |
453 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
454 | */ | |
455 | acpi_status wmi_install_notify_handler(const char *guid, | |
456 | wmi_notify_handler handler, void *data) | |
457 | { | |
458 | struct wmi_block *block; | |
a66bfa7a | 459 | acpi_status status; |
bff431e4 CC |
460 | |
461 | if (!guid || !handler) | |
462 | return AE_BAD_PARAMETER; | |
463 | ||
464 | find_guid(guid, &block); | |
465 | if (!block) | |
466 | return AE_NOT_EXIST; | |
467 | ||
468 | if (block->handler) | |
469 | return AE_ALREADY_ACQUIRED; | |
470 | ||
471 | block->handler = handler; | |
472 | block->handler_data = data; | |
473 | ||
a66bfa7a MG |
474 | status = wmi_method_enable(block, 1); |
475 | ||
476 | return status; | |
bff431e4 CC |
477 | } |
478 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
479 | ||
480 | /** | |
481 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
482 | * | |
483 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
484 | */ | |
485 | acpi_status wmi_remove_notify_handler(const char *guid) | |
486 | { | |
487 | struct wmi_block *block; | |
a66bfa7a | 488 | acpi_status status; |
bff431e4 CC |
489 | |
490 | if (!guid) | |
491 | return AE_BAD_PARAMETER; | |
492 | ||
493 | find_guid(guid, &block); | |
494 | if (!block) | |
495 | return AE_NOT_EXIST; | |
496 | ||
497 | if (!block->handler) | |
498 | return AE_NULL_ENTRY; | |
499 | ||
a66bfa7a MG |
500 | status = wmi_method_enable(block, 0); |
501 | ||
bff431e4 CC |
502 | block->handler = NULL; |
503 | block->handler_data = NULL; | |
504 | ||
a66bfa7a | 505 | return status; |
bff431e4 CC |
506 | } |
507 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
508 | ||
509 | /** | |
510 | * wmi_get_event_data - Get WMI data associated with an event | |
511 | * | |
512 | * @event - Event to find | |
513 | * &out - Buffer to hold event data | |
514 | * | |
515 | * Returns extra data associated with an event in WMI. | |
516 | */ | |
517 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
518 | { | |
519 | struct acpi_object_list input; | |
520 | union acpi_object params[1]; | |
521 | struct guid_block *gblock; | |
522 | struct wmi_block *wblock; | |
523 | struct list_head *p; | |
524 | ||
525 | input.count = 1; | |
526 | input.pointer = params; | |
527 | params[0].type = ACPI_TYPE_INTEGER; | |
528 | params[0].integer.value = event; | |
529 | ||
530 | list_for_each(p, &wmi_blocks.list) { | |
531 | wblock = list_entry(p, struct wmi_block, list); | |
532 | gblock = &wblock->gblock; | |
533 | ||
534 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
535 | (gblock->notify_id == event)) | |
536 | return acpi_evaluate_object(wblock->handle, "_WED", | |
537 | &input, out); | |
538 | } | |
539 | ||
540 | return AE_NOT_FOUND; | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
543 | ||
544 | /** | |
545 | * wmi_has_guid - Check if a GUID is available | |
546 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
547 | * | |
548 | * Check if a given GUID is defined by _WDG | |
549 | */ | |
550 | bool wmi_has_guid(const char *guid_string) | |
551 | { | |
552 | return find_guid(guid_string, NULL); | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
555 | ||
556 | /* | |
557 | * Parse the _WDG method for the GUID data blocks | |
558 | */ | |
559 | static __init acpi_status parse_wdg(acpi_handle handle) | |
560 | { | |
561 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
562 | union acpi_object *obj; | |
563 | struct guid_block *gblock; | |
564 | struct wmi_block *wblock; | |
565 | acpi_status status; | |
566 | u32 i, total; | |
567 | ||
568 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
569 | ||
570 | if (ACPI_FAILURE(status)) | |
571 | return status; | |
572 | ||
573 | obj = (union acpi_object *) out.pointer; | |
574 | ||
575 | if (obj->type != ACPI_TYPE_BUFFER) | |
576 | return AE_ERROR; | |
577 | ||
578 | total = obj->buffer.length / sizeof(struct guid_block); | |
579 | ||
580 | gblock = kzalloc(obj->buffer.length, GFP_KERNEL); | |
581 | if (!gblock) | |
582 | return AE_NO_MEMORY; | |
583 | ||
584 | memcpy(gblock, obj->buffer.pointer, obj->buffer.length); | |
585 | ||
586 | for (i = 0; i < total; i++) { | |
587 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
588 | if (!wblock) | |
589 | return AE_NO_MEMORY; | |
590 | ||
591 | wblock->gblock = gblock[i]; | |
592 | wblock->handle = handle; | |
593 | list_add_tail(&wblock->list, &wmi_blocks.list); | |
594 | } | |
595 | ||
596 | kfree(out.pointer); | |
597 | kfree(gblock); | |
598 | ||
599 | return status; | |
600 | } | |
601 | ||
602 | /* | |
603 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
604 | * hand these off to the EC driver. | |
605 | */ | |
606 | static acpi_status | |
607 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
608 | u32 bits, acpi_integer * value, | |
609 | void *handler_context, void *region_context) | |
610 | { | |
611 | int result = 0, i = 0; | |
612 | u8 temp = 0; | |
613 | ||
614 | if ((address > 0xFF) || !value) | |
615 | return AE_BAD_PARAMETER; | |
616 | ||
617 | if (function != ACPI_READ && function != ACPI_WRITE) | |
618 | return AE_BAD_PARAMETER; | |
619 | ||
620 | if (bits != 8) | |
621 | return AE_BAD_PARAMETER; | |
622 | ||
623 | if (function == ACPI_READ) { | |
624 | result = ec_read(address, &temp); | |
625 | (*value) |= ((acpi_integer)temp) << i; | |
626 | } else { | |
627 | temp = 0xff & ((*value) >> i); | |
628 | result = ec_write(address, temp); | |
629 | } | |
630 | ||
631 | switch (result) { | |
632 | case -EINVAL: | |
633 | return AE_BAD_PARAMETER; | |
634 | break; | |
635 | case -ENODEV: | |
636 | return AE_NOT_FOUND; | |
637 | break; | |
638 | case -ETIME: | |
639 | return AE_TIME; | |
640 | break; | |
641 | default: | |
642 | return AE_OK; | |
643 | } | |
644 | } | |
645 | ||
646 | static void acpi_wmi_notify(acpi_handle handle, u32 event, void *data) | |
647 | { | |
648 | struct guid_block *block; | |
649 | struct wmi_block *wblock; | |
650 | struct list_head *p; | |
651 | struct acpi_device *device = data; | |
652 | ||
653 | list_for_each(p, &wmi_blocks.list) { | |
654 | wblock = list_entry(p, struct wmi_block, list); | |
655 | block = &wblock->gblock; | |
656 | ||
657 | if ((block->flags & ACPI_WMI_EVENT) && | |
658 | (block->notify_id == event)) { | |
659 | if (wblock->handler) | |
660 | wblock->handler(event, wblock->handler_data); | |
661 | ||
662 | acpi_bus_generate_netlink_event( | |
0794469d | 663 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
664 | event, 0); |
665 | break; | |
666 | } | |
667 | } | |
668 | } | |
669 | ||
670 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
671 | { | |
672 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
673 | acpi_wmi_notify); | |
674 | ||
675 | acpi_remove_address_space_handler(device->handle, | |
676 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | static int __init acpi_wmi_add(struct acpi_device *device) | |
682 | { | |
683 | acpi_status status; | |
684 | int result = 0; | |
685 | ||
686 | status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
687 | acpi_wmi_notify, device); | |
688 | if (ACPI_FAILURE(status)) { | |
689 | printk(KERN_ERR PREFIX "Error installing notify handler\n"); | |
690 | return -ENODEV; | |
691 | } | |
692 | ||
693 | status = acpi_install_address_space_handler(device->handle, | |
694 | ACPI_ADR_SPACE_EC, | |
695 | &acpi_wmi_ec_space_handler, | |
696 | NULL, NULL); | |
697 | if (ACPI_FAILURE(status)) | |
698 | return -ENODEV; | |
699 | ||
700 | status = parse_wdg(device->handle); | |
701 | if (ACPI_FAILURE(status)) { | |
702 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
703 | return -ENODEV; | |
704 | } | |
705 | ||
706 | return result; | |
707 | } | |
708 | ||
709 | static int __init acpi_wmi_init(void) | |
710 | { | |
711 | acpi_status result; | |
712 | ||
96b5a46e LT |
713 | INIT_LIST_HEAD(&wmi_blocks.list); |
714 | ||
bff431e4 CC |
715 | if (acpi_disabled) |
716 | return -ENODEV; | |
717 | ||
bff431e4 CC |
718 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
719 | ||
720 | if (result < 0) { | |
721 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
722 | } else { | |
723 | printk(KERN_INFO PREFIX "Mapper loaded\n"); | |
724 | } | |
725 | ||
726 | return result; | |
727 | } | |
728 | ||
729 | static void __exit acpi_wmi_exit(void) | |
730 | { | |
731 | struct list_head *p, *tmp; | |
732 | struct wmi_block *wblock; | |
733 | ||
734 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
735 | ||
736 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
737 | wblock = list_entry(p, struct wmi_block, list); | |
738 | ||
739 | list_del(p); | |
740 | kfree(wblock); | |
741 | } | |
742 | ||
743 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
744 | } | |
745 | ||
746 | subsys_initcall(acpi_wmi_init); | |
747 | module_exit(acpi_wmi_exit); |