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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> | |
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 | ||
bff431e4 CC |
45 | #define PREFIX "ACPI: WMI: " |
46 | ||
47 | static DEFINE_MUTEX(wmi_data_lock); | |
48 | ||
49 | struct guid_block { | |
50 | char guid[16]; | |
51 | union { | |
52 | char object_id[2]; | |
53 | struct { | |
54 | unsigned char notify_id; | |
55 | unsigned char reserved; | |
56 | }; | |
57 | }; | |
58 | u8 instance_count; | |
59 | u8 flags; | |
60 | }; | |
61 | ||
62 | struct wmi_block { | |
63 | struct list_head list; | |
64 | struct guid_block gblock; | |
65 | acpi_handle handle; | |
66 | wmi_notify_handler handler; | |
67 | void *handler_data; | |
68 | }; | |
69 | ||
70 | static struct wmi_block wmi_blocks; | |
71 | ||
72 | /* | |
73 | * If the GUID data block is marked as expensive, we must enable and | |
74 | * explicitily disable data collection. | |
75 | */ | |
76 | #define ACPI_WMI_EXPENSIVE 0x1 | |
77 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
78 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
79 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
80 | ||
81 | static int acpi_wmi_remove(struct acpi_device *device, int type); | |
82 | static int acpi_wmi_add(struct acpi_device *device); | |
f61bb939 | 83 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
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, | |
f61bb939 | 99 | .notify = acpi_wmi_notify, |
bff431e4 CC |
100 | }, |
101 | }; | |
102 | ||
103 | /* | |
104 | * GUID parsing functions | |
105 | */ | |
106 | ||
107 | /** | |
108 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
109 | * @src: Pointer to at least 2 characters to convert. | |
110 | * | |
111 | * Convert a two character ASCII hex string to a number. | |
112 | * | |
113 | * Return: 0-255 Success, the byte was parsed correctly | |
114 | * -1 Error, an invalid character was supplied | |
115 | */ | |
116 | static int wmi_parse_hexbyte(const u8 *src) | |
117 | { | |
118 | unsigned int x; /* For correct wrapping */ | |
119 | int h; | |
120 | ||
121 | /* high part */ | |
122 | x = src[0]; | |
123 | if (x - '0' <= '9' - '0') { | |
124 | h = x - '0'; | |
125 | } else if (x - 'a' <= 'f' - 'a') { | |
126 | h = x - 'a' + 10; | |
127 | } else if (x - 'A' <= 'F' - 'A') { | |
128 | h = x - 'A' + 10; | |
129 | } else { | |
130 | return -1; | |
131 | } | |
132 | h <<= 4; | |
133 | ||
134 | /* low part */ | |
135 | x = src[1]; | |
136 | if (x - '0' <= '9' - '0') | |
137 | return h | (x - '0'); | |
138 | if (x - 'a' <= 'f' - 'a') | |
139 | return h | (x - 'a' + 10); | |
140 | if (x - 'A' <= 'F' - 'A') | |
141 | return h | (x - 'A' + 10); | |
142 | return -1; | |
143 | } | |
144 | ||
145 | /** | |
146 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
147 | * @src: Memory block holding binary GUID (16 bytes) | |
148 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
149 | * | |
150 | * Byte swap a binary GUID to match it's real GUID value | |
151 | */ | |
152 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
153 | { | |
154 | int i; | |
155 | ||
156 | for (i = 0; i <= 3; i++) | |
157 | memcpy(dest + i, src + (3 - i), 1); | |
158 | ||
159 | for (i = 0; i <= 1; i++) | |
160 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
161 | ||
162 | for (i = 0; i <= 1; i++) | |
163 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
164 | ||
165 | memcpy(dest + 8, src + 8, 8); | |
166 | } | |
167 | ||
168 | /** | |
169 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
170 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
171 | * @dest: Memory block to hold binary GUID (16 bytes) | |
172 | * | |
173 | * N.B. The GUID need not be NULL terminated. | |
174 | * | |
175 | * Return: 'true' @dest contains binary GUID | |
176 | * 'false' @dest contents are undefined | |
177 | */ | |
178 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
179 | { | |
180 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
181 | int i, j, v; | |
182 | ||
183 | if (src[8] != '-' || src[13] != '-' || | |
184 | src[18] != '-' || src[23] != '-') | |
185 | return false; | |
186 | ||
187 | for (j = 0; j < 5; j++, src++) { | |
188 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
189 | v = wmi_parse_hexbyte(src); | |
190 | if (v < 0) | |
191 | return false; | |
192 | } | |
193 | } | |
194 | ||
195 | return true; | |
196 | } | |
197 | ||
198 | static bool find_guid(const char *guid_string, struct wmi_block **out) | |
199 | { | |
200 | char tmp[16], guid_input[16]; | |
201 | struct wmi_block *wblock; | |
202 | struct guid_block *block; | |
203 | struct list_head *p; | |
204 | ||
205 | wmi_parse_guid(guid_string, tmp); | |
206 | wmi_swap_bytes(tmp, guid_input); | |
207 | ||
208 | list_for_each(p, &wmi_blocks.list) { | |
209 | wblock = list_entry(p, struct wmi_block, list); | |
210 | block = &wblock->gblock; | |
211 | ||
212 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
213 | if (out) | |
214 | *out = wblock; | |
215 | return 1; | |
216 | } | |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
a66bfa7a MG |
221 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
222 | { | |
223 | struct guid_block *block = NULL; | |
224 | char method[5]; | |
225 | struct acpi_object_list input; | |
226 | union acpi_object params[1]; | |
227 | acpi_status status; | |
228 | acpi_handle handle; | |
229 | ||
230 | block = &wblock->gblock; | |
231 | handle = wblock->handle; | |
232 | ||
233 | if (!block) | |
234 | return AE_NOT_EXIST; | |
235 | ||
236 | input.count = 1; | |
237 | input.pointer = params; | |
238 | params[0].type = ACPI_TYPE_INTEGER; | |
239 | params[0].integer.value = enable; | |
240 | ||
241 | snprintf(method, 5, "WE%02X", block->notify_id); | |
242 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
243 | ||
244 | if (status != AE_OK && status != AE_NOT_FOUND) | |
245 | return status; | |
246 | else | |
247 | return AE_OK; | |
248 | } | |
249 | ||
bff431e4 CC |
250 | /* |
251 | * Exported WMI functions | |
252 | */ | |
253 | /** | |
254 | * wmi_evaluate_method - Evaluate a WMI method | |
255 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
256 | * @instance: Instance index | |
257 | * @method_id: Method ID to call | |
258 | * &in: Buffer containing input for the method call | |
259 | * &out: Empty buffer to return the method results | |
260 | * | |
261 | * Call an ACPI-WMI method | |
262 | */ | |
263 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
264 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
265 | { | |
266 | struct guid_block *block = NULL; | |
267 | struct wmi_block *wblock = NULL; | |
268 | acpi_handle handle; | |
269 | acpi_status status; | |
270 | struct acpi_object_list input; | |
271 | union acpi_object params[3]; | |
f3d83e24 | 272 | char method[5] = "WM"; |
bff431e4 CC |
273 | |
274 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 275 | return AE_ERROR; |
bff431e4 CC |
276 | |
277 | block = &wblock->gblock; | |
278 | handle = wblock->handle; | |
279 | ||
e6bafba5 | 280 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
281 | return AE_BAD_DATA; |
282 | ||
283 | if (block->instance_count < instance) | |
284 | return AE_BAD_PARAMETER; | |
285 | ||
286 | input.count = 2; | |
287 | input.pointer = params; | |
288 | params[0].type = ACPI_TYPE_INTEGER; | |
289 | params[0].integer.value = instance; | |
290 | params[1].type = ACPI_TYPE_INTEGER; | |
291 | params[1].integer.value = method_id; | |
292 | ||
293 | if (in) { | |
294 | input.count = 3; | |
295 | ||
296 | if (block->flags & ACPI_WMI_STRING) { | |
297 | params[2].type = ACPI_TYPE_STRING; | |
298 | } else { | |
299 | params[2].type = ACPI_TYPE_BUFFER; | |
300 | } | |
301 | params[2].buffer.length = in->length; | |
302 | params[2].buffer.pointer = in->pointer; | |
303 | } | |
304 | ||
305 | strncat(method, block->object_id, 2); | |
306 | ||
307 | status = acpi_evaluate_object(handle, method, &input, out); | |
308 | ||
309 | return status; | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
312 | ||
313 | /** | |
314 | * wmi_query_block - Return contents of a WMI block | |
315 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
316 | * @instance: Instance index | |
317 | * &out: Empty buffer to return the contents of the data block to | |
318 | * | |
319 | * Return the contents of an ACPI-WMI data block to a buffer | |
320 | */ | |
321 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
322 | struct acpi_buffer *out) | |
323 | { | |
324 | struct guid_block *block = NULL; | |
325 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 326 | acpi_handle handle, wc_handle; |
bff431e4 CC |
327 | acpi_status status, wc_status = AE_ERROR; |
328 | struct acpi_object_list input, wc_input; | |
329 | union acpi_object wc_params[1], wq_params[1]; | |
f3d83e24 CL |
330 | char method[5]; |
331 | char wc_method[5] = "WC"; | |
bff431e4 CC |
332 | |
333 | if (!guid_string || !out) | |
334 | return AE_BAD_PARAMETER; | |
335 | ||
336 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 337 | return AE_ERROR; |
bff431e4 CC |
338 | |
339 | block = &wblock->gblock; | |
340 | handle = wblock->handle; | |
341 | ||
342 | if (block->instance_count < instance) | |
343 | return AE_BAD_PARAMETER; | |
344 | ||
345 | /* Check GUID is a data block */ | |
346 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 347 | return AE_ERROR; |
bff431e4 CC |
348 | |
349 | input.count = 1; | |
350 | input.pointer = wq_params; | |
351 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
352 | wq_params[0].integer.value = instance; | |
353 | ||
354 | /* | |
355 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
356 | * enable collection. | |
357 | */ | |
358 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
359 | wc_input.count = 1; | |
360 | wc_input.pointer = wc_params; | |
361 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
362 | wc_params[0].integer.value = 1; | |
363 | ||
364 | strncat(wc_method, block->object_id, 2); | |
365 | ||
366 | /* | |
367 | * Some GUIDs break the specification by declaring themselves | |
368 | * expensive, but have no corresponding WCxx method. So we | |
369 | * should not fail if this happens. | |
370 | */ | |
a527f2d7 CC |
371 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
372 | if (ACPI_SUCCESS(wc_status)) | |
373 | wc_status = acpi_evaluate_object(handle, wc_method, | |
374 | &wc_input, NULL); | |
bff431e4 CC |
375 | } |
376 | ||
377 | strcpy(method, "WQ"); | |
378 | strncat(method, block->object_id, 2); | |
379 | ||
dab36ad8 | 380 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
381 | |
382 | /* | |
383 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
384 | * the WQxx method failed - we should disable collection anyway. | |
385 | */ | |
a527f2d7 | 386 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
387 | wc_params[0].integer.value = 0; |
388 | status = acpi_evaluate_object(handle, | |
389 | wc_method, &wc_input, NULL); | |
390 | } | |
391 | ||
392 | return status; | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
395 | ||
396 | /** | |
397 | * wmi_set_block - Write to a WMI block | |
398 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
399 | * @instance: Instance index | |
400 | * &in: Buffer containing new values for the data block | |
401 | * | |
402 | * Write the contents of the input buffer to an ACPI-WMI data block | |
403 | */ | |
404 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
405 | const struct acpi_buffer *in) | |
406 | { | |
407 | struct guid_block *block = NULL; | |
408 | struct wmi_block *wblock = NULL; | |
409 | acpi_handle handle; | |
410 | struct acpi_object_list input; | |
411 | union acpi_object params[2]; | |
f3d83e24 | 412 | char method[5] = "WS"; |
bff431e4 CC |
413 | |
414 | if (!guid_string || !in) | |
415 | return AE_BAD_DATA; | |
416 | ||
417 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 418 | return AE_ERROR; |
bff431e4 CC |
419 | |
420 | block = &wblock->gblock; | |
421 | handle = wblock->handle; | |
422 | ||
423 | if (block->instance_count < instance) | |
424 | return AE_BAD_PARAMETER; | |
425 | ||
426 | /* Check GUID is a data block */ | |
427 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 428 | return AE_ERROR; |
bff431e4 CC |
429 | |
430 | input.count = 2; | |
431 | input.pointer = params; | |
432 | params[0].type = ACPI_TYPE_INTEGER; | |
433 | params[0].integer.value = instance; | |
434 | ||
435 | if (block->flags & ACPI_WMI_STRING) { | |
436 | params[1].type = ACPI_TYPE_STRING; | |
437 | } else { | |
438 | params[1].type = ACPI_TYPE_BUFFER; | |
439 | } | |
440 | params[1].buffer.length = in->length; | |
441 | params[1].buffer.pointer = in->pointer; | |
442 | ||
443 | strncat(method, block->object_id, 2); | |
444 | ||
445 | return acpi_evaluate_object(handle, method, &input, NULL); | |
446 | } | |
447 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
448 | ||
449 | /** | |
450 | * wmi_install_notify_handler - Register handler for WMI events | |
451 | * @handler: Function to handle notifications | |
452 | * @data: Data to be returned to handler when event is fired | |
453 | * | |
454 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
455 | */ | |
456 | acpi_status wmi_install_notify_handler(const char *guid, | |
457 | wmi_notify_handler handler, void *data) | |
458 | { | |
459 | struct wmi_block *block; | |
a66bfa7a | 460 | acpi_status status; |
bff431e4 CC |
461 | |
462 | if (!guid || !handler) | |
463 | return AE_BAD_PARAMETER; | |
464 | ||
465 | find_guid(guid, &block); | |
466 | if (!block) | |
467 | return AE_NOT_EXIST; | |
468 | ||
469 | if (block->handler) | |
470 | return AE_ALREADY_ACQUIRED; | |
471 | ||
472 | block->handler = handler; | |
473 | block->handler_data = data; | |
474 | ||
a66bfa7a MG |
475 | status = wmi_method_enable(block, 1); |
476 | ||
477 | return status; | |
bff431e4 CC |
478 | } |
479 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
480 | ||
481 | /** | |
482 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
483 | * | |
484 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
485 | */ | |
486 | acpi_status wmi_remove_notify_handler(const char *guid) | |
487 | { | |
488 | struct wmi_block *block; | |
a66bfa7a | 489 | acpi_status status; |
bff431e4 CC |
490 | |
491 | if (!guid) | |
492 | return AE_BAD_PARAMETER; | |
493 | ||
494 | find_guid(guid, &block); | |
495 | if (!block) | |
496 | return AE_NOT_EXIST; | |
497 | ||
498 | if (!block->handler) | |
499 | return AE_NULL_ENTRY; | |
500 | ||
a66bfa7a MG |
501 | status = wmi_method_enable(block, 0); |
502 | ||
bff431e4 CC |
503 | block->handler = NULL; |
504 | block->handler_data = NULL; | |
505 | ||
a66bfa7a | 506 | return status; |
bff431e4 CC |
507 | } |
508 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
509 | ||
510 | /** | |
511 | * wmi_get_event_data - Get WMI data associated with an event | |
512 | * | |
513 | * @event - Event to find | |
514 | * &out - Buffer to hold event data | |
515 | * | |
516 | * Returns extra data associated with an event in WMI. | |
517 | */ | |
518 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
519 | { | |
520 | struct acpi_object_list input; | |
521 | union acpi_object params[1]; | |
522 | struct guid_block *gblock; | |
523 | struct wmi_block *wblock; | |
524 | struct list_head *p; | |
525 | ||
526 | input.count = 1; | |
527 | input.pointer = params; | |
528 | params[0].type = ACPI_TYPE_INTEGER; | |
529 | params[0].integer.value = event; | |
530 | ||
531 | list_for_each(p, &wmi_blocks.list) { | |
532 | wblock = list_entry(p, struct wmi_block, list); | |
533 | gblock = &wblock->gblock; | |
534 | ||
535 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
536 | (gblock->notify_id == event)) | |
537 | return acpi_evaluate_object(wblock->handle, "_WED", | |
538 | &input, out); | |
539 | } | |
540 | ||
541 | return AE_NOT_FOUND; | |
542 | } | |
543 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
544 | ||
545 | /** | |
546 | * wmi_has_guid - Check if a GUID is available | |
547 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
548 | * | |
549 | * Check if a given GUID is defined by _WDG | |
550 | */ | |
551 | bool wmi_has_guid(const char *guid_string) | |
552 | { | |
553 | return find_guid(guid_string, NULL); | |
554 | } | |
555 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
556 | ||
557 | /* | |
558 | * Parse the _WDG method for the GUID data blocks | |
559 | */ | |
560 | static __init acpi_status parse_wdg(acpi_handle handle) | |
561 | { | |
562 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
563 | union acpi_object *obj; | |
564 | struct guid_block *gblock; | |
565 | struct wmi_block *wblock; | |
566 | acpi_status status; | |
567 | u32 i, total; | |
568 | ||
569 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
570 | ||
571 | if (ACPI_FAILURE(status)) | |
572 | return status; | |
573 | ||
574 | obj = (union acpi_object *) out.pointer; | |
575 | ||
576 | if (obj->type != ACPI_TYPE_BUFFER) | |
577 | return AE_ERROR; | |
578 | ||
579 | total = obj->buffer.length / sizeof(struct guid_block); | |
580 | ||
581 | gblock = kzalloc(obj->buffer.length, GFP_KERNEL); | |
582 | if (!gblock) | |
583 | return AE_NO_MEMORY; | |
584 | ||
585 | memcpy(gblock, obj->buffer.pointer, obj->buffer.length); | |
586 | ||
587 | for (i = 0; i < total; i++) { | |
588 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); | |
589 | if (!wblock) | |
590 | return AE_NO_MEMORY; | |
591 | ||
592 | wblock->gblock = gblock[i]; | |
593 | wblock->handle = handle; | |
594 | list_add_tail(&wblock->list, &wmi_blocks.list); | |
595 | } | |
596 | ||
597 | kfree(out.pointer); | |
598 | kfree(gblock); | |
599 | ||
600 | return status; | |
601 | } | |
602 | ||
603 | /* | |
604 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
605 | * hand these off to the EC driver. | |
606 | */ | |
607 | static acpi_status | |
608 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
609 | u32 bits, acpi_integer * value, | |
610 | void *handler_context, void *region_context) | |
611 | { | |
612 | int result = 0, i = 0; | |
613 | u8 temp = 0; | |
614 | ||
615 | if ((address > 0xFF) || !value) | |
616 | return AE_BAD_PARAMETER; | |
617 | ||
618 | if (function != ACPI_READ && function != ACPI_WRITE) | |
619 | return AE_BAD_PARAMETER; | |
620 | ||
621 | if (bits != 8) | |
622 | return AE_BAD_PARAMETER; | |
623 | ||
624 | if (function == ACPI_READ) { | |
625 | result = ec_read(address, &temp); | |
626 | (*value) |= ((acpi_integer)temp) << i; | |
627 | } else { | |
628 | temp = 0xff & ((*value) >> i); | |
629 | result = ec_write(address, temp); | |
630 | } | |
631 | ||
632 | switch (result) { | |
633 | case -EINVAL: | |
634 | return AE_BAD_PARAMETER; | |
635 | break; | |
636 | case -ENODEV: | |
637 | return AE_NOT_FOUND; | |
638 | break; | |
639 | case -ETIME: | |
640 | return AE_TIME; | |
641 | break; | |
642 | default: | |
643 | return AE_OK; | |
644 | } | |
645 | } | |
646 | ||
f61bb939 | 647 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
648 | { |
649 | struct guid_block *block; | |
650 | struct wmi_block *wblock; | |
651 | struct list_head *p; | |
bff431e4 CC |
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 | { | |
bff431e4 CC |
672 | acpi_remove_address_space_handler(device->handle, |
673 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | static int __init acpi_wmi_add(struct acpi_device *device) | |
679 | { | |
680 | acpi_status status; | |
681 | int result = 0; | |
682 | ||
bff431e4 CC |
683 | status = acpi_install_address_space_handler(device->handle, |
684 | ACPI_ADR_SPACE_EC, | |
685 | &acpi_wmi_ec_space_handler, | |
686 | NULL, NULL); | |
687 | if (ACPI_FAILURE(status)) | |
688 | return -ENODEV; | |
689 | ||
690 | status = parse_wdg(device->handle); | |
691 | if (ACPI_FAILURE(status)) { | |
692 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
693 | return -ENODEV; | |
694 | } | |
695 | ||
696 | return result; | |
697 | } | |
698 | ||
699 | static int __init acpi_wmi_init(void) | |
700 | { | |
da511997 | 701 | int result; |
bff431e4 | 702 | |
96b5a46e LT |
703 | INIT_LIST_HEAD(&wmi_blocks.list); |
704 | ||
bff431e4 CC |
705 | if (acpi_disabled) |
706 | return -ENODEV; | |
707 | ||
bff431e4 CC |
708 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
709 | ||
710 | if (result < 0) { | |
711 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
712 | } else { | |
713 | printk(KERN_INFO PREFIX "Mapper loaded\n"); | |
714 | } | |
715 | ||
716 | return result; | |
717 | } | |
718 | ||
719 | static void __exit acpi_wmi_exit(void) | |
720 | { | |
721 | struct list_head *p, *tmp; | |
722 | struct wmi_block *wblock; | |
723 | ||
724 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
725 | ||
726 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
727 | wblock = list_entry(p, struct wmi_block, list); | |
728 | ||
729 | list_del(p); | |
730 | kfree(wblock); | |
731 | } | |
732 | ||
733 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
734 | } | |
735 | ||
736 | subsys_initcall(acpi_wmi_init); | |
737 | module_exit(acpi_wmi_exit); |