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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> | |
36 | #include <acpi/acpi_bus.h> | |
37 | #include <acpi/acpi_drivers.h> | |
38 | ||
39 | ACPI_MODULE_NAME("wmi"); | |
40 | MODULE_AUTHOR("Carlos Corbacho"); | |
41 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
44 | #define ACPI_WMI_CLASS "wmi" | |
45 | ||
bff431e4 CC |
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; | |
1caab3c1 | 69 | struct device *dev; |
bff431e4 CC |
70 | }; |
71 | ||
72 | static struct wmi_block wmi_blocks; | |
73 | ||
74 | /* | |
75 | * If the GUID data block is marked as expensive, we must enable and | |
76 | * explicitily disable data collection. | |
77 | */ | |
78 | #define ACPI_WMI_EXPENSIVE 0x1 | |
79 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
80 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
81 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
82 | ||
83 | static int acpi_wmi_remove(struct acpi_device *device, int type); | |
84 | static int acpi_wmi_add(struct acpi_device *device); | |
f61bb939 | 85 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
86 | |
87 | static const struct acpi_device_id wmi_device_ids[] = { | |
88 | {"PNP0C14", 0}, | |
89 | {"pnp0c14", 0}, | |
90 | {"", 0}, | |
91 | }; | |
92 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
93 | ||
94 | static struct acpi_driver acpi_wmi_driver = { | |
95 | .name = "wmi", | |
96 | .class = ACPI_WMI_CLASS, | |
97 | .ids = wmi_device_ids, | |
98 | .ops = { | |
99 | .add = acpi_wmi_add, | |
100 | .remove = acpi_wmi_remove, | |
f61bb939 | 101 | .notify = acpi_wmi_notify, |
bff431e4 CC |
102 | }, |
103 | }; | |
104 | ||
105 | /* | |
106 | * GUID parsing functions | |
107 | */ | |
108 | ||
109 | /** | |
110 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
111 | * @src: Pointer to at least 2 characters to convert. | |
112 | * | |
113 | * Convert a two character ASCII hex string to a number. | |
114 | * | |
115 | * Return: 0-255 Success, the byte was parsed correctly | |
116 | * -1 Error, an invalid character was supplied | |
117 | */ | |
118 | static int wmi_parse_hexbyte(const u8 *src) | |
119 | { | |
120 | unsigned int x; /* For correct wrapping */ | |
121 | int h; | |
122 | ||
123 | /* high part */ | |
124 | x = src[0]; | |
125 | if (x - '0' <= '9' - '0') { | |
126 | h = x - '0'; | |
127 | } else if (x - 'a' <= 'f' - 'a') { | |
128 | h = x - 'a' + 10; | |
129 | } else if (x - 'A' <= 'F' - 'A') { | |
130 | h = x - 'A' + 10; | |
131 | } else { | |
132 | return -1; | |
133 | } | |
134 | h <<= 4; | |
135 | ||
136 | /* low part */ | |
137 | x = src[1]; | |
138 | if (x - '0' <= '9' - '0') | |
139 | return h | (x - '0'); | |
140 | if (x - 'a' <= 'f' - 'a') | |
141 | return h | (x - 'a' + 10); | |
142 | if (x - 'A' <= 'F' - 'A') | |
143 | return h | (x - 'A' + 10); | |
144 | return -1; | |
145 | } | |
146 | ||
147 | /** | |
148 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
149 | * @src: Memory block holding binary GUID (16 bytes) | |
150 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
151 | * | |
152 | * Byte swap a binary GUID to match it's real GUID value | |
153 | */ | |
154 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
155 | { | |
156 | int i; | |
157 | ||
158 | for (i = 0; i <= 3; i++) | |
159 | memcpy(dest + i, src + (3 - i), 1); | |
160 | ||
161 | for (i = 0; i <= 1; i++) | |
162 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
163 | ||
164 | for (i = 0; i <= 1; i++) | |
165 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
166 | ||
167 | memcpy(dest + 8, src + 8, 8); | |
168 | } | |
169 | ||
170 | /** | |
171 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
172 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
173 | * @dest: Memory block to hold binary GUID (16 bytes) | |
174 | * | |
175 | * N.B. The GUID need not be NULL terminated. | |
176 | * | |
177 | * Return: 'true' @dest contains binary GUID | |
178 | * 'false' @dest contents are undefined | |
179 | */ | |
180 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
181 | { | |
182 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
183 | int i, j, v; | |
184 | ||
185 | if (src[8] != '-' || src[13] != '-' || | |
186 | src[18] != '-' || src[23] != '-') | |
187 | return false; | |
188 | ||
189 | for (j = 0; j < 5; j++, src++) { | |
190 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
191 | v = wmi_parse_hexbyte(src); | |
192 | if (v < 0) | |
193 | return false; | |
194 | } | |
195 | } | |
196 | ||
197 | return true; | |
198 | } | |
199 | ||
1caab3c1 MG |
200 | /* |
201 | * Convert a raw GUID to the ACII string representation | |
202 | */ | |
203 | static int wmi_gtoa(const char *in, char *out) | |
204 | { | |
205 | int i; | |
206 | ||
207 | for (i = 3; i >= 0; i--) | |
208 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
209 | ||
210 | out += sprintf(out, "-"); | |
211 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
212 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
213 | out += sprintf(out, "-"); | |
214 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
215 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
216 | out += sprintf(out, "-"); | |
217 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
218 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
219 | out += sprintf(out, "-"); | |
220 | ||
221 | for (i = 10; i <= 15; i++) | |
222 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
223 | ||
224 | out = '\0'; | |
225 | return 0; | |
226 | } | |
227 | ||
bff431e4 CC |
228 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
229 | { | |
230 | char tmp[16], guid_input[16]; | |
231 | struct wmi_block *wblock; | |
232 | struct guid_block *block; | |
233 | struct list_head *p; | |
234 | ||
235 | wmi_parse_guid(guid_string, tmp); | |
236 | wmi_swap_bytes(tmp, guid_input); | |
237 | ||
238 | list_for_each(p, &wmi_blocks.list) { | |
239 | wblock = list_entry(p, struct wmi_block, list); | |
240 | block = &wblock->gblock; | |
241 | ||
242 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
243 | if (out) | |
244 | *out = wblock; | |
245 | return 1; | |
246 | } | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
a66bfa7a MG |
251 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
252 | { | |
253 | struct guid_block *block = NULL; | |
254 | char method[5]; | |
255 | struct acpi_object_list input; | |
256 | union acpi_object params[1]; | |
257 | acpi_status status; | |
258 | acpi_handle handle; | |
259 | ||
260 | block = &wblock->gblock; | |
261 | handle = wblock->handle; | |
262 | ||
263 | if (!block) | |
264 | return AE_NOT_EXIST; | |
265 | ||
266 | input.count = 1; | |
267 | input.pointer = params; | |
268 | params[0].type = ACPI_TYPE_INTEGER; | |
269 | params[0].integer.value = enable; | |
270 | ||
271 | snprintf(method, 5, "WE%02X", block->notify_id); | |
272 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
273 | ||
274 | if (status != AE_OK && status != AE_NOT_FOUND) | |
275 | return status; | |
276 | else | |
277 | return AE_OK; | |
278 | } | |
279 | ||
bff431e4 CC |
280 | /* |
281 | * Exported WMI functions | |
282 | */ | |
283 | /** | |
284 | * wmi_evaluate_method - Evaluate a WMI method | |
285 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
286 | * @instance: Instance index | |
287 | * @method_id: Method ID to call | |
288 | * &in: Buffer containing input for the method call | |
289 | * &out: Empty buffer to return the method results | |
290 | * | |
291 | * Call an ACPI-WMI method | |
292 | */ | |
293 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
294 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
295 | { | |
296 | struct guid_block *block = NULL; | |
297 | struct wmi_block *wblock = NULL; | |
298 | acpi_handle handle; | |
299 | acpi_status status; | |
300 | struct acpi_object_list input; | |
301 | union acpi_object params[3]; | |
f3d83e24 | 302 | char method[5] = "WM"; |
bff431e4 CC |
303 | |
304 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 305 | return AE_ERROR; |
bff431e4 CC |
306 | |
307 | block = &wblock->gblock; | |
308 | handle = wblock->handle; | |
309 | ||
e6bafba5 | 310 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
311 | return AE_BAD_DATA; |
312 | ||
313 | if (block->instance_count < instance) | |
314 | return AE_BAD_PARAMETER; | |
315 | ||
316 | input.count = 2; | |
317 | input.pointer = params; | |
318 | params[0].type = ACPI_TYPE_INTEGER; | |
319 | params[0].integer.value = instance; | |
320 | params[1].type = ACPI_TYPE_INTEGER; | |
321 | params[1].integer.value = method_id; | |
322 | ||
323 | if (in) { | |
324 | input.count = 3; | |
325 | ||
326 | if (block->flags & ACPI_WMI_STRING) { | |
327 | params[2].type = ACPI_TYPE_STRING; | |
328 | } else { | |
329 | params[2].type = ACPI_TYPE_BUFFER; | |
330 | } | |
331 | params[2].buffer.length = in->length; | |
332 | params[2].buffer.pointer = in->pointer; | |
333 | } | |
334 | ||
335 | strncat(method, block->object_id, 2); | |
336 | ||
337 | status = acpi_evaluate_object(handle, method, &input, out); | |
338 | ||
339 | return status; | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
342 | ||
343 | /** | |
344 | * wmi_query_block - Return contents of a WMI block | |
345 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
346 | * @instance: Instance index | |
347 | * &out: Empty buffer to return the contents of the data block to | |
348 | * | |
349 | * Return the contents of an ACPI-WMI data block to a buffer | |
350 | */ | |
351 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
352 | struct acpi_buffer *out) | |
353 | { | |
354 | struct guid_block *block = NULL; | |
355 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 356 | acpi_handle handle, wc_handle; |
bff431e4 CC |
357 | acpi_status status, wc_status = AE_ERROR; |
358 | struct acpi_object_list input, wc_input; | |
359 | union acpi_object wc_params[1], wq_params[1]; | |
f3d83e24 CL |
360 | char method[5]; |
361 | char wc_method[5] = "WC"; | |
bff431e4 CC |
362 | |
363 | if (!guid_string || !out) | |
364 | return AE_BAD_PARAMETER; | |
365 | ||
366 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 367 | return AE_ERROR; |
bff431e4 CC |
368 | |
369 | block = &wblock->gblock; | |
370 | handle = wblock->handle; | |
371 | ||
372 | if (block->instance_count < instance) | |
373 | return AE_BAD_PARAMETER; | |
374 | ||
375 | /* Check GUID is a data block */ | |
376 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 377 | return AE_ERROR; |
bff431e4 CC |
378 | |
379 | input.count = 1; | |
380 | input.pointer = wq_params; | |
381 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
382 | wq_params[0].integer.value = instance; | |
383 | ||
384 | /* | |
385 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
386 | * enable collection. | |
387 | */ | |
388 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
389 | wc_input.count = 1; | |
390 | wc_input.pointer = wc_params; | |
391 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
392 | wc_params[0].integer.value = 1; | |
393 | ||
394 | strncat(wc_method, block->object_id, 2); | |
395 | ||
396 | /* | |
397 | * Some GUIDs break the specification by declaring themselves | |
398 | * expensive, but have no corresponding WCxx method. So we | |
399 | * should not fail if this happens. | |
400 | */ | |
a527f2d7 CC |
401 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
402 | if (ACPI_SUCCESS(wc_status)) | |
403 | wc_status = acpi_evaluate_object(handle, wc_method, | |
404 | &wc_input, NULL); | |
bff431e4 CC |
405 | } |
406 | ||
407 | strcpy(method, "WQ"); | |
408 | strncat(method, block->object_id, 2); | |
409 | ||
dab36ad8 | 410 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
411 | |
412 | /* | |
413 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
414 | * the WQxx method failed - we should disable collection anyway. | |
415 | */ | |
a527f2d7 | 416 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
417 | wc_params[0].integer.value = 0; |
418 | status = acpi_evaluate_object(handle, | |
419 | wc_method, &wc_input, NULL); | |
420 | } | |
421 | ||
422 | return status; | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
425 | ||
426 | /** | |
427 | * wmi_set_block - Write to a WMI block | |
428 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
429 | * @instance: Instance index | |
430 | * &in: Buffer containing new values for the data block | |
431 | * | |
432 | * Write the contents of the input buffer to an ACPI-WMI data block | |
433 | */ | |
434 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
435 | const struct acpi_buffer *in) | |
436 | { | |
437 | struct guid_block *block = NULL; | |
438 | struct wmi_block *wblock = NULL; | |
439 | acpi_handle handle; | |
440 | struct acpi_object_list input; | |
441 | union acpi_object params[2]; | |
f3d83e24 | 442 | char method[5] = "WS"; |
bff431e4 CC |
443 | |
444 | if (!guid_string || !in) | |
445 | return AE_BAD_DATA; | |
446 | ||
447 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 448 | return AE_ERROR; |
bff431e4 CC |
449 | |
450 | block = &wblock->gblock; | |
451 | handle = wblock->handle; | |
452 | ||
453 | if (block->instance_count < instance) | |
454 | return AE_BAD_PARAMETER; | |
455 | ||
456 | /* Check GUID is a data block */ | |
457 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 458 | return AE_ERROR; |
bff431e4 CC |
459 | |
460 | input.count = 2; | |
461 | input.pointer = params; | |
462 | params[0].type = ACPI_TYPE_INTEGER; | |
463 | params[0].integer.value = instance; | |
464 | ||
465 | if (block->flags & ACPI_WMI_STRING) { | |
466 | params[1].type = ACPI_TYPE_STRING; | |
467 | } else { | |
468 | params[1].type = ACPI_TYPE_BUFFER; | |
469 | } | |
470 | params[1].buffer.length = in->length; | |
471 | params[1].buffer.pointer = in->pointer; | |
472 | ||
473 | strncat(method, block->object_id, 2); | |
474 | ||
475 | return acpi_evaluate_object(handle, method, &input, NULL); | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
478 | ||
479 | /** | |
480 | * wmi_install_notify_handler - Register handler for WMI events | |
481 | * @handler: Function to handle notifications | |
482 | * @data: Data to be returned to handler when event is fired | |
483 | * | |
484 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
485 | */ | |
486 | acpi_status wmi_install_notify_handler(const char *guid, | |
487 | wmi_notify_handler handler, void *data) | |
488 | { | |
489 | struct wmi_block *block; | |
a66bfa7a | 490 | acpi_status status; |
bff431e4 CC |
491 | |
492 | if (!guid || !handler) | |
493 | return AE_BAD_PARAMETER; | |
494 | ||
c03b26a5 | 495 | if (!find_guid(guid, &block)) |
bff431e4 CC |
496 | return AE_NOT_EXIST; |
497 | ||
498 | if (block->handler) | |
499 | return AE_ALREADY_ACQUIRED; | |
500 | ||
501 | block->handler = handler; | |
502 | block->handler_data = data; | |
503 | ||
a66bfa7a MG |
504 | status = wmi_method_enable(block, 1); |
505 | ||
506 | return status; | |
bff431e4 CC |
507 | } |
508 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
509 | ||
510 | /** | |
511 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
512 | * | |
513 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
514 | */ | |
515 | acpi_status wmi_remove_notify_handler(const char *guid) | |
516 | { | |
517 | struct wmi_block *block; | |
a66bfa7a | 518 | acpi_status status; |
bff431e4 CC |
519 | |
520 | if (!guid) | |
521 | return AE_BAD_PARAMETER; | |
522 | ||
c03b26a5 | 523 | if (!find_guid(guid, &block)) |
bff431e4 CC |
524 | return AE_NOT_EXIST; |
525 | ||
526 | if (!block->handler) | |
527 | return AE_NULL_ENTRY; | |
528 | ||
a66bfa7a MG |
529 | status = wmi_method_enable(block, 0); |
530 | ||
bff431e4 CC |
531 | block->handler = NULL; |
532 | block->handler_data = NULL; | |
533 | ||
a66bfa7a | 534 | return status; |
bff431e4 CC |
535 | } |
536 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
537 | ||
538 | /** | |
539 | * wmi_get_event_data - Get WMI data associated with an event | |
540 | * | |
3e9b988e AA |
541 | * @event: Event to find |
542 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
543 | * |
544 | * Returns extra data associated with an event in WMI. | |
545 | */ | |
546 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
547 | { | |
548 | struct acpi_object_list input; | |
549 | union acpi_object params[1]; | |
550 | struct guid_block *gblock; | |
551 | struct wmi_block *wblock; | |
552 | struct list_head *p; | |
553 | ||
554 | input.count = 1; | |
555 | input.pointer = params; | |
556 | params[0].type = ACPI_TYPE_INTEGER; | |
557 | params[0].integer.value = event; | |
558 | ||
559 | list_for_each(p, &wmi_blocks.list) { | |
560 | wblock = list_entry(p, struct wmi_block, list); | |
561 | gblock = &wblock->gblock; | |
562 | ||
563 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
564 | (gblock->notify_id == event)) | |
565 | return acpi_evaluate_object(wblock->handle, "_WED", | |
566 | &input, out); | |
567 | } | |
568 | ||
569 | return AE_NOT_FOUND; | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
572 | ||
573 | /** | |
574 | * wmi_has_guid - Check if a GUID is available | |
575 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
576 | * | |
577 | * Check if a given GUID is defined by _WDG | |
578 | */ | |
579 | bool wmi_has_guid(const char *guid_string) | |
580 | { | |
581 | return find_guid(guid_string, NULL); | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
584 | ||
1caab3c1 MG |
585 | /* |
586 | * sysfs interface | |
587 | */ | |
588 | static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, | |
589 | char *buf) | |
590 | { | |
591 | char guid_string[37]; | |
592 | struct wmi_block *wblock; | |
593 | ||
594 | wblock = dev_get_drvdata(dev); | |
595 | if (!wblock) | |
596 | return -ENOMEM; | |
597 | ||
598 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
599 | ||
600 | return sprintf(buf, "wmi:%s\n", guid_string); | |
601 | } | |
602 | static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); | |
603 | ||
604 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
605 | { | |
606 | char guid_string[37]; | |
607 | ||
608 | struct wmi_block *wblock; | |
609 | ||
610 | if (add_uevent_var(env, "MODALIAS=")) | |
611 | return -ENOMEM; | |
612 | ||
613 | wblock = dev_get_drvdata(dev); | |
614 | if (!wblock) | |
615 | return -ENOMEM; | |
616 | ||
617 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
618 | ||
619 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
620 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
621 | env->buflen += 40; | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
626 | static void wmi_dev_free(struct device *dev) | |
627 | { | |
628 | kfree(dev); | |
629 | } | |
630 | ||
631 | static struct class wmi_class = { | |
632 | .name = "wmi", | |
633 | .dev_release = wmi_dev_free, | |
634 | .dev_uevent = wmi_dev_uevent, | |
635 | }; | |
636 | ||
637 | static int wmi_create_devs(void) | |
638 | { | |
639 | int result; | |
640 | char guid_string[37]; | |
641 | struct guid_block *gblock; | |
642 | struct wmi_block *wblock; | |
643 | struct list_head *p; | |
644 | struct device *guid_dev; | |
645 | ||
646 | /* Create devices for all the GUIDs */ | |
647 | list_for_each(p, &wmi_blocks.list) { | |
648 | wblock = list_entry(p, struct wmi_block, list); | |
649 | ||
650 | guid_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
651 | if (!guid_dev) | |
652 | return -ENOMEM; | |
653 | ||
654 | wblock->dev = guid_dev; | |
655 | ||
656 | guid_dev->class = &wmi_class; | |
657 | dev_set_drvdata(guid_dev, wblock); | |
658 | ||
659 | gblock = &wblock->gblock; | |
660 | ||
661 | wmi_gtoa(gblock->guid, guid_string); | |
662 | dev_set_name(guid_dev, guid_string); | |
663 | ||
664 | result = device_register(guid_dev); | |
665 | if (result) | |
666 | return result; | |
667 | ||
668 | result = device_create_file(guid_dev, &dev_attr_modalias); | |
669 | if (result) | |
670 | return result; | |
671 | } | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
676 | static void wmi_remove_devs(void) | |
677 | { | |
678 | struct guid_block *gblock; | |
679 | struct wmi_block *wblock; | |
680 | struct list_head *p; | |
681 | struct device *guid_dev; | |
682 | ||
683 | /* Delete devices for all the GUIDs */ | |
684 | list_for_each(p, &wmi_blocks.list) { | |
685 | wblock = list_entry(p, struct wmi_block, list); | |
686 | ||
687 | guid_dev = wblock->dev; | |
688 | gblock = &wblock->gblock; | |
689 | ||
690 | device_remove_file(guid_dev, &dev_attr_modalias); | |
691 | ||
692 | device_unregister(guid_dev); | |
693 | } | |
694 | } | |
695 | ||
696 | static void wmi_class_exit(void) | |
697 | { | |
698 | wmi_remove_devs(); | |
699 | class_unregister(&wmi_class); | |
700 | } | |
701 | ||
702 | static int wmi_class_init(void) | |
703 | { | |
704 | int ret; | |
705 | ||
706 | ret = class_register(&wmi_class); | |
707 | if (ret) | |
708 | return ret; | |
709 | ||
710 | ret = wmi_create_devs(); | |
711 | if (ret) | |
712 | wmi_class_exit(); | |
713 | ||
714 | return ret; | |
715 | } | |
716 | ||
d1f9e497 CC |
717 | static bool guid_already_parsed(const char *guid_string) |
718 | { | |
719 | struct guid_block *gblock; | |
720 | struct wmi_block *wblock; | |
721 | struct list_head *p; | |
722 | ||
723 | list_for_each(p, &wmi_blocks.list) { | |
724 | wblock = list_entry(p, struct wmi_block, list); | |
725 | gblock = &wblock->gblock; | |
726 | ||
727 | if (strncmp(gblock->guid, guid_string, 16) == 0) | |
728 | return true; | |
729 | } | |
730 | return false; | |
731 | } | |
732 | ||
bff431e4 CC |
733 | /* |
734 | * Parse the _WDG method for the GUID data blocks | |
735 | */ | |
736 | static __init acpi_status parse_wdg(acpi_handle handle) | |
737 | { | |
738 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
739 | union acpi_object *obj; | |
740 | struct guid_block *gblock; | |
741 | struct wmi_block *wblock; | |
d1f9e497 | 742 | char guid_string[37]; |
bff431e4 CC |
743 | acpi_status status; |
744 | u32 i, total; | |
745 | ||
746 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
747 | ||
748 | if (ACPI_FAILURE(status)) | |
749 | return status; | |
750 | ||
751 | obj = (union acpi_object *) out.pointer; | |
752 | ||
753 | if (obj->type != ACPI_TYPE_BUFFER) | |
754 | return AE_ERROR; | |
755 | ||
756 | total = obj->buffer.length / sizeof(struct guid_block); | |
757 | ||
758 | gblock = kzalloc(obj->buffer.length, GFP_KERNEL); | |
759 | if (!gblock) | |
760 | return AE_NO_MEMORY; | |
761 | ||
762 | memcpy(gblock, obj->buffer.pointer, obj->buffer.length); | |
763 | ||
764 | for (i = 0; i < total; i++) { | |
d1f9e497 CC |
765 | /* |
766 | Some WMI devices, like those for nVidia hooks, have a | |
767 | duplicate GUID. It's not clear what we should do in this | |
768 | case yet, so for now, we'll just ignore the duplicate. | |
769 | Anyone who wants to add support for that device can come | |
770 | up with a better workaround for the mess then. | |
771 | */ | |
772 | if (guid_already_parsed(gblock[i].guid) == true) { | |
773 | wmi_gtoa(gblock[i].guid, guid_string); | |
774 | printk(KERN_INFO PREFIX "Skipping duplicate GUID %s\n", | |
775 | guid_string); | |
776 | continue; | |
777 | } | |
bff431e4 CC |
778 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
779 | if (!wblock) | |
780 | return AE_NO_MEMORY; | |
781 | ||
782 | wblock->gblock = gblock[i]; | |
783 | wblock->handle = handle; | |
784 | list_add_tail(&wblock->list, &wmi_blocks.list); | |
785 | } | |
786 | ||
787 | kfree(out.pointer); | |
788 | kfree(gblock); | |
789 | ||
790 | return status; | |
791 | } | |
792 | ||
793 | /* | |
794 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
795 | * hand these off to the EC driver. | |
796 | */ | |
797 | static acpi_status | |
798 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
799 | u32 bits, acpi_integer * value, | |
800 | void *handler_context, void *region_context) | |
801 | { | |
802 | int result = 0, i = 0; | |
803 | u8 temp = 0; | |
804 | ||
805 | if ((address > 0xFF) || !value) | |
806 | return AE_BAD_PARAMETER; | |
807 | ||
808 | if (function != ACPI_READ && function != ACPI_WRITE) | |
809 | return AE_BAD_PARAMETER; | |
810 | ||
811 | if (bits != 8) | |
812 | return AE_BAD_PARAMETER; | |
813 | ||
814 | if (function == ACPI_READ) { | |
815 | result = ec_read(address, &temp); | |
816 | (*value) |= ((acpi_integer)temp) << i; | |
817 | } else { | |
818 | temp = 0xff & ((*value) >> i); | |
819 | result = ec_write(address, temp); | |
820 | } | |
821 | ||
822 | switch (result) { | |
823 | case -EINVAL: | |
824 | return AE_BAD_PARAMETER; | |
825 | break; | |
826 | case -ENODEV: | |
827 | return AE_NOT_FOUND; | |
828 | break; | |
829 | case -ETIME: | |
830 | return AE_TIME; | |
831 | break; | |
832 | default: | |
833 | return AE_OK; | |
834 | } | |
835 | } | |
836 | ||
f61bb939 | 837 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
838 | { |
839 | struct guid_block *block; | |
840 | struct wmi_block *wblock; | |
841 | struct list_head *p; | |
bff431e4 CC |
842 | |
843 | list_for_each(p, &wmi_blocks.list) { | |
844 | wblock = list_entry(p, struct wmi_block, list); | |
845 | block = &wblock->gblock; | |
846 | ||
847 | if ((block->flags & ACPI_WMI_EVENT) && | |
848 | (block->notify_id == event)) { | |
849 | if (wblock->handler) | |
850 | wblock->handler(event, wblock->handler_data); | |
851 | ||
852 | acpi_bus_generate_netlink_event( | |
0794469d | 853 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
854 | event, 0); |
855 | break; | |
856 | } | |
857 | } | |
858 | } | |
859 | ||
860 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
861 | { | |
bff431e4 CC |
862 | acpi_remove_address_space_handler(device->handle, |
863 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | static int __init acpi_wmi_add(struct acpi_device *device) | |
869 | { | |
870 | acpi_status status; | |
871 | int result = 0; | |
872 | ||
bff431e4 CC |
873 | status = acpi_install_address_space_handler(device->handle, |
874 | ACPI_ADR_SPACE_EC, | |
875 | &acpi_wmi_ec_space_handler, | |
876 | NULL, NULL); | |
877 | if (ACPI_FAILURE(status)) | |
878 | return -ENODEV; | |
879 | ||
880 | status = parse_wdg(device->handle); | |
881 | if (ACPI_FAILURE(status)) { | |
882 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
883 | return -ENODEV; | |
884 | } | |
885 | ||
886 | return result; | |
887 | } | |
888 | ||
889 | static int __init acpi_wmi_init(void) | |
890 | { | |
da511997 | 891 | int result; |
bff431e4 | 892 | |
96b5a46e LT |
893 | INIT_LIST_HEAD(&wmi_blocks.list); |
894 | ||
bff431e4 CC |
895 | if (acpi_disabled) |
896 | return -ENODEV; | |
897 | ||
bff431e4 CC |
898 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
899 | ||
900 | if (result < 0) { | |
901 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
1caab3c1 MG |
902 | return -ENODEV; |
903 | } | |
904 | ||
905 | result = wmi_class_init(); | |
906 | if (result) { | |
907 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
908 | return result; | |
bff431e4 CC |
909 | } |
910 | ||
1caab3c1 MG |
911 | printk(KERN_INFO PREFIX "Mapper loaded\n"); |
912 | ||
bff431e4 CC |
913 | return result; |
914 | } | |
915 | ||
916 | static void __exit acpi_wmi_exit(void) | |
917 | { | |
918 | struct list_head *p, *tmp; | |
919 | struct wmi_block *wblock; | |
920 | ||
1caab3c1 MG |
921 | wmi_class_exit(); |
922 | ||
bff431e4 CC |
923 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
924 | ||
925 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
926 | wblock = list_entry(p, struct wmi_block, list); | |
927 | ||
928 | list_del(p); | |
929 | kfree(wblock); | |
930 | } | |
931 | ||
932 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
933 | } | |
934 | ||
935 | subsys_initcall(acpi_wmi_init); | |
936 | module_exit(acpi_wmi_exit); |