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