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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 | ||
fc3155b2 TR |
84 | static int debug_event; |
85 | module_param(debug_event, bool, 0444); | |
86 | MODULE_PARM_DESC(debug_event, | |
87 | "Log WMI Events [0/1]"); | |
88 | ||
bff431e4 CC |
89 | static int acpi_wmi_remove(struct acpi_device *device, int type); |
90 | static int acpi_wmi_add(struct acpi_device *device); | |
f61bb939 | 91 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
92 | |
93 | static const struct acpi_device_id wmi_device_ids[] = { | |
94 | {"PNP0C14", 0}, | |
95 | {"pnp0c14", 0}, | |
96 | {"", 0}, | |
97 | }; | |
98 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
99 | ||
100 | static struct acpi_driver acpi_wmi_driver = { | |
101 | .name = "wmi", | |
102 | .class = ACPI_WMI_CLASS, | |
103 | .ids = wmi_device_ids, | |
104 | .ops = { | |
105 | .add = acpi_wmi_add, | |
106 | .remove = acpi_wmi_remove, | |
f61bb939 | 107 | .notify = acpi_wmi_notify, |
bff431e4 CC |
108 | }, |
109 | }; | |
110 | ||
111 | /* | |
112 | * GUID parsing functions | |
113 | */ | |
114 | ||
115 | /** | |
116 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
117 | * @src: Pointer to at least 2 characters to convert. | |
118 | * | |
119 | * Convert a two character ASCII hex string to a number. | |
120 | * | |
121 | * Return: 0-255 Success, the byte was parsed correctly | |
122 | * -1 Error, an invalid character was supplied | |
123 | */ | |
124 | static int wmi_parse_hexbyte(const u8 *src) | |
125 | { | |
126 | unsigned int x; /* For correct wrapping */ | |
127 | int h; | |
128 | ||
129 | /* high part */ | |
130 | x = src[0]; | |
131 | if (x - '0' <= '9' - '0') { | |
132 | h = x - '0'; | |
133 | } else if (x - 'a' <= 'f' - 'a') { | |
134 | h = x - 'a' + 10; | |
135 | } else if (x - 'A' <= 'F' - 'A') { | |
136 | h = x - 'A' + 10; | |
137 | } else { | |
138 | return -1; | |
139 | } | |
140 | h <<= 4; | |
141 | ||
142 | /* low part */ | |
143 | x = src[1]; | |
144 | if (x - '0' <= '9' - '0') | |
145 | return h | (x - '0'); | |
146 | if (x - 'a' <= 'f' - 'a') | |
147 | return h | (x - 'a' + 10); | |
148 | if (x - 'A' <= 'F' - 'A') | |
149 | return h | (x - 'A' + 10); | |
150 | return -1; | |
151 | } | |
152 | ||
153 | /** | |
154 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
155 | * @src: Memory block holding binary GUID (16 bytes) | |
156 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
157 | * | |
158 | * Byte swap a binary GUID to match it's real GUID value | |
159 | */ | |
160 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
161 | { | |
162 | int i; | |
163 | ||
164 | for (i = 0; i <= 3; i++) | |
165 | memcpy(dest + i, src + (3 - i), 1); | |
166 | ||
167 | for (i = 0; i <= 1; i++) | |
168 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
169 | ||
170 | for (i = 0; i <= 1; i++) | |
171 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
172 | ||
173 | memcpy(dest + 8, src + 8, 8); | |
174 | } | |
175 | ||
176 | /** | |
177 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
178 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
179 | * @dest: Memory block to hold binary GUID (16 bytes) | |
180 | * | |
181 | * N.B. The GUID need not be NULL terminated. | |
182 | * | |
183 | * Return: 'true' @dest contains binary GUID | |
184 | * 'false' @dest contents are undefined | |
185 | */ | |
186 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
187 | { | |
188 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
189 | int i, j, v; | |
190 | ||
191 | if (src[8] != '-' || src[13] != '-' || | |
192 | src[18] != '-' || src[23] != '-') | |
193 | return false; | |
194 | ||
195 | for (j = 0; j < 5; j++, src++) { | |
196 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
197 | v = wmi_parse_hexbyte(src); | |
198 | if (v < 0) | |
199 | return false; | |
200 | } | |
201 | } | |
202 | ||
203 | return true; | |
204 | } | |
205 | ||
1caab3c1 MG |
206 | /* |
207 | * Convert a raw GUID to the ACII string representation | |
208 | */ | |
209 | static int wmi_gtoa(const char *in, char *out) | |
210 | { | |
211 | int i; | |
212 | ||
213 | for (i = 3; i >= 0; i--) | |
214 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
215 | ||
216 | out += sprintf(out, "-"); | |
217 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
218 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
219 | out += sprintf(out, "-"); | |
220 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
221 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
222 | out += sprintf(out, "-"); | |
223 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
224 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
225 | out += sprintf(out, "-"); | |
226 | ||
227 | for (i = 10; i <= 15; i++) | |
228 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
229 | ||
230 | out = '\0'; | |
231 | return 0; | |
232 | } | |
233 | ||
bff431e4 CC |
234 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
235 | { | |
236 | char tmp[16], guid_input[16]; | |
237 | struct wmi_block *wblock; | |
238 | struct guid_block *block; | |
239 | struct list_head *p; | |
240 | ||
241 | wmi_parse_guid(guid_string, tmp); | |
242 | wmi_swap_bytes(tmp, guid_input); | |
243 | ||
244 | list_for_each(p, &wmi_blocks.list) { | |
245 | wblock = list_entry(p, struct wmi_block, list); | |
246 | block = &wblock->gblock; | |
247 | ||
248 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
249 | if (out) | |
250 | *out = wblock; | |
251 | return 1; | |
252 | } | |
253 | } | |
254 | return 0; | |
255 | } | |
256 | ||
a66bfa7a MG |
257 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
258 | { | |
259 | struct guid_block *block = NULL; | |
260 | char method[5]; | |
261 | struct acpi_object_list input; | |
262 | union acpi_object params[1]; | |
263 | acpi_status status; | |
264 | acpi_handle handle; | |
265 | ||
266 | block = &wblock->gblock; | |
267 | handle = wblock->handle; | |
268 | ||
269 | if (!block) | |
270 | return AE_NOT_EXIST; | |
271 | ||
272 | input.count = 1; | |
273 | input.pointer = params; | |
274 | params[0].type = ACPI_TYPE_INTEGER; | |
275 | params[0].integer.value = enable; | |
276 | ||
277 | snprintf(method, 5, "WE%02X", block->notify_id); | |
278 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
279 | ||
280 | if (status != AE_OK && status != AE_NOT_FOUND) | |
281 | return status; | |
282 | else | |
283 | return AE_OK; | |
284 | } | |
285 | ||
bff431e4 CC |
286 | /* |
287 | * Exported WMI functions | |
288 | */ | |
289 | /** | |
290 | * wmi_evaluate_method - Evaluate a WMI method | |
291 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
292 | * @instance: Instance index | |
293 | * @method_id: Method ID to call | |
294 | * &in: Buffer containing input for the method call | |
295 | * &out: Empty buffer to return the method results | |
296 | * | |
297 | * Call an ACPI-WMI method | |
298 | */ | |
299 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
300 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
301 | { | |
302 | struct guid_block *block = NULL; | |
303 | struct wmi_block *wblock = NULL; | |
304 | acpi_handle handle; | |
305 | acpi_status status; | |
306 | struct acpi_object_list input; | |
307 | union acpi_object params[3]; | |
f3d83e24 | 308 | char method[5] = "WM"; |
bff431e4 CC |
309 | |
310 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 311 | return AE_ERROR; |
bff431e4 CC |
312 | |
313 | block = &wblock->gblock; | |
314 | handle = wblock->handle; | |
315 | ||
e6bafba5 | 316 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
317 | return AE_BAD_DATA; |
318 | ||
319 | if (block->instance_count < instance) | |
320 | return AE_BAD_PARAMETER; | |
321 | ||
322 | input.count = 2; | |
323 | input.pointer = params; | |
324 | params[0].type = ACPI_TYPE_INTEGER; | |
325 | params[0].integer.value = instance; | |
326 | params[1].type = ACPI_TYPE_INTEGER; | |
327 | params[1].integer.value = method_id; | |
328 | ||
329 | if (in) { | |
330 | input.count = 3; | |
331 | ||
332 | if (block->flags & ACPI_WMI_STRING) { | |
333 | params[2].type = ACPI_TYPE_STRING; | |
334 | } else { | |
335 | params[2].type = ACPI_TYPE_BUFFER; | |
336 | } | |
337 | params[2].buffer.length = in->length; | |
338 | params[2].buffer.pointer = in->pointer; | |
339 | } | |
340 | ||
341 | strncat(method, block->object_id, 2); | |
342 | ||
343 | status = acpi_evaluate_object(handle, method, &input, out); | |
344 | ||
345 | return status; | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
348 | ||
349 | /** | |
350 | * wmi_query_block - Return contents of a WMI block | |
351 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
352 | * @instance: Instance index | |
353 | * &out: Empty buffer to return the contents of the data block to | |
354 | * | |
355 | * Return the contents of an ACPI-WMI data block to a buffer | |
356 | */ | |
357 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
358 | struct acpi_buffer *out) | |
359 | { | |
360 | struct guid_block *block = NULL; | |
361 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 362 | acpi_handle handle, wc_handle; |
bff431e4 CC |
363 | acpi_status status, wc_status = AE_ERROR; |
364 | struct acpi_object_list input, wc_input; | |
365 | union acpi_object wc_params[1], wq_params[1]; | |
f3d83e24 CL |
366 | char method[5]; |
367 | char wc_method[5] = "WC"; | |
bff431e4 CC |
368 | |
369 | if (!guid_string || !out) | |
370 | return AE_BAD_PARAMETER; | |
371 | ||
372 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 373 | return AE_ERROR; |
bff431e4 CC |
374 | |
375 | block = &wblock->gblock; | |
376 | handle = wblock->handle; | |
377 | ||
378 | if (block->instance_count < instance) | |
379 | return AE_BAD_PARAMETER; | |
380 | ||
381 | /* Check GUID is a data block */ | |
382 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 383 | return AE_ERROR; |
bff431e4 CC |
384 | |
385 | input.count = 1; | |
386 | input.pointer = wq_params; | |
387 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
388 | wq_params[0].integer.value = instance; | |
389 | ||
390 | /* | |
391 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
392 | * enable collection. | |
393 | */ | |
394 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
395 | wc_input.count = 1; | |
396 | wc_input.pointer = wc_params; | |
397 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
398 | wc_params[0].integer.value = 1; | |
399 | ||
400 | strncat(wc_method, block->object_id, 2); | |
401 | ||
402 | /* | |
403 | * Some GUIDs break the specification by declaring themselves | |
404 | * expensive, but have no corresponding WCxx method. So we | |
405 | * should not fail if this happens. | |
406 | */ | |
a527f2d7 CC |
407 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
408 | if (ACPI_SUCCESS(wc_status)) | |
409 | wc_status = acpi_evaluate_object(handle, wc_method, | |
410 | &wc_input, NULL); | |
bff431e4 CC |
411 | } |
412 | ||
413 | strcpy(method, "WQ"); | |
414 | strncat(method, block->object_id, 2); | |
415 | ||
dab36ad8 | 416 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
417 | |
418 | /* | |
419 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
420 | * the WQxx method failed - we should disable collection anyway. | |
421 | */ | |
a527f2d7 | 422 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
423 | wc_params[0].integer.value = 0; |
424 | status = acpi_evaluate_object(handle, | |
425 | wc_method, &wc_input, NULL); | |
426 | } | |
427 | ||
428 | return status; | |
429 | } | |
430 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
431 | ||
432 | /** | |
433 | * wmi_set_block - Write to a WMI block | |
434 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
435 | * @instance: Instance index | |
436 | * &in: Buffer containing new values for the data block | |
437 | * | |
438 | * Write the contents of the input buffer to an ACPI-WMI data block | |
439 | */ | |
440 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
441 | const struct acpi_buffer *in) | |
442 | { | |
443 | struct guid_block *block = NULL; | |
444 | struct wmi_block *wblock = NULL; | |
445 | acpi_handle handle; | |
446 | struct acpi_object_list input; | |
447 | union acpi_object params[2]; | |
f3d83e24 | 448 | char method[5] = "WS"; |
bff431e4 CC |
449 | |
450 | if (!guid_string || !in) | |
451 | return AE_BAD_DATA; | |
452 | ||
453 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 454 | return AE_ERROR; |
bff431e4 CC |
455 | |
456 | block = &wblock->gblock; | |
457 | handle = wblock->handle; | |
458 | ||
459 | if (block->instance_count < instance) | |
460 | return AE_BAD_PARAMETER; | |
461 | ||
462 | /* Check GUID is a data block */ | |
463 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 464 | return AE_ERROR; |
bff431e4 CC |
465 | |
466 | input.count = 2; | |
467 | input.pointer = params; | |
468 | params[0].type = ACPI_TYPE_INTEGER; | |
469 | params[0].integer.value = instance; | |
470 | ||
471 | if (block->flags & ACPI_WMI_STRING) { | |
472 | params[1].type = ACPI_TYPE_STRING; | |
473 | } else { | |
474 | params[1].type = ACPI_TYPE_BUFFER; | |
475 | } | |
476 | params[1].buffer.length = in->length; | |
477 | params[1].buffer.pointer = in->pointer; | |
478 | ||
479 | strncat(method, block->object_id, 2); | |
480 | ||
481 | return acpi_evaluate_object(handle, method, &input, NULL); | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
484 | ||
fc3155b2 TR |
485 | static void wmi_notify_debug(u32 value, void *context) |
486 | { | |
487 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
488 | union acpi_object *obj; | |
489 | ||
490 | wmi_get_event_data(value, &response); | |
491 | ||
492 | obj = (union acpi_object *)response.pointer; | |
493 | ||
494 | if (!obj) | |
495 | return; | |
496 | ||
497 | printk(KERN_INFO PREFIX "DEBUG Event "); | |
498 | switch(obj->type) { | |
499 | case ACPI_TYPE_BUFFER: | |
500 | printk("BUFFER_TYPE - length %d\n", obj->buffer.length); | |
501 | break; | |
502 | case ACPI_TYPE_STRING: | |
503 | printk("STRING_TYPE - %s\n", obj->string.pointer); | |
504 | break; | |
505 | case ACPI_TYPE_INTEGER: | |
506 | printk("INTEGER_TYPE - %llu\n", obj->integer.value); | |
507 | break; | |
508 | case ACPI_TYPE_PACKAGE: | |
509 | printk("PACKAGE_TYPE - %d elements\n", obj->package.count); | |
510 | break; | |
511 | default: | |
512 | printk("object type 0x%X\n", obj->type); | |
513 | } | |
514 | } | |
515 | ||
bff431e4 CC |
516 | /** |
517 | * wmi_install_notify_handler - Register handler for WMI events | |
518 | * @handler: Function to handle notifications | |
519 | * @data: Data to be returned to handler when event is fired | |
520 | * | |
521 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
522 | */ | |
523 | acpi_status wmi_install_notify_handler(const char *guid, | |
524 | wmi_notify_handler handler, void *data) | |
525 | { | |
526 | struct wmi_block *block; | |
a66bfa7a | 527 | acpi_status status; |
bff431e4 CC |
528 | |
529 | if (!guid || !handler) | |
530 | return AE_BAD_PARAMETER; | |
531 | ||
c03b26a5 | 532 | if (!find_guid(guid, &block)) |
bff431e4 CC |
533 | return AE_NOT_EXIST; |
534 | ||
fc3155b2 | 535 | if (block->handler && block->handler != wmi_notify_debug) |
bff431e4 CC |
536 | return AE_ALREADY_ACQUIRED; |
537 | ||
538 | block->handler = handler; | |
539 | block->handler_data = data; | |
540 | ||
a66bfa7a MG |
541 | status = wmi_method_enable(block, 1); |
542 | ||
543 | return status; | |
bff431e4 CC |
544 | } |
545 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
546 | ||
547 | /** | |
548 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
549 | * | |
550 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
551 | */ | |
552 | acpi_status wmi_remove_notify_handler(const char *guid) | |
553 | { | |
554 | struct wmi_block *block; | |
fc3155b2 | 555 | acpi_status status = AE_OK; |
bff431e4 CC |
556 | |
557 | if (!guid) | |
558 | return AE_BAD_PARAMETER; | |
559 | ||
c03b26a5 | 560 | if (!find_guid(guid, &block)) |
bff431e4 CC |
561 | return AE_NOT_EXIST; |
562 | ||
fc3155b2 | 563 | if (!block->handler || block->handler == wmi_notify_debug) |
bff431e4 CC |
564 | return AE_NULL_ENTRY; |
565 | ||
fc3155b2 TR |
566 | if (debug_event) { |
567 | block->handler = wmi_notify_debug; | |
568 | } else { | |
569 | status = wmi_method_enable(block, 0); | |
570 | block->handler = NULL; | |
571 | block->handler_data = NULL; | |
572 | } | |
a66bfa7a | 573 | return status; |
bff431e4 CC |
574 | } |
575 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
576 | ||
577 | /** | |
578 | * wmi_get_event_data - Get WMI data associated with an event | |
579 | * | |
3e9b988e AA |
580 | * @event: Event to find |
581 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
582 | * |
583 | * Returns extra data associated with an event in WMI. | |
584 | */ | |
585 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
586 | { | |
587 | struct acpi_object_list input; | |
588 | union acpi_object params[1]; | |
589 | struct guid_block *gblock; | |
590 | struct wmi_block *wblock; | |
591 | struct list_head *p; | |
592 | ||
593 | input.count = 1; | |
594 | input.pointer = params; | |
595 | params[0].type = ACPI_TYPE_INTEGER; | |
596 | params[0].integer.value = event; | |
597 | ||
598 | list_for_each(p, &wmi_blocks.list) { | |
599 | wblock = list_entry(p, struct wmi_block, list); | |
600 | gblock = &wblock->gblock; | |
601 | ||
602 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
603 | (gblock->notify_id == event)) | |
604 | return acpi_evaluate_object(wblock->handle, "_WED", | |
605 | &input, out); | |
606 | } | |
607 | ||
608 | return AE_NOT_FOUND; | |
609 | } | |
610 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
611 | ||
612 | /** | |
613 | * wmi_has_guid - Check if a GUID is available | |
614 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
615 | * | |
616 | * Check if a given GUID is defined by _WDG | |
617 | */ | |
618 | bool wmi_has_guid(const char *guid_string) | |
619 | { | |
620 | return find_guid(guid_string, NULL); | |
621 | } | |
622 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
623 | ||
1caab3c1 MG |
624 | /* |
625 | * sysfs interface | |
626 | */ | |
627 | static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, | |
628 | char *buf) | |
629 | { | |
630 | char guid_string[37]; | |
631 | struct wmi_block *wblock; | |
632 | ||
633 | wblock = dev_get_drvdata(dev); | |
634 | if (!wblock) | |
635 | return -ENOMEM; | |
636 | ||
637 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
638 | ||
639 | return sprintf(buf, "wmi:%s\n", guid_string); | |
640 | } | |
641 | static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); | |
642 | ||
643 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
644 | { | |
645 | char guid_string[37]; | |
646 | ||
647 | struct wmi_block *wblock; | |
648 | ||
649 | if (add_uevent_var(env, "MODALIAS=")) | |
650 | return -ENOMEM; | |
651 | ||
652 | wblock = dev_get_drvdata(dev); | |
653 | if (!wblock) | |
654 | return -ENOMEM; | |
655 | ||
656 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
657 | ||
658 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
659 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
660 | env->buflen += 40; | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | static void wmi_dev_free(struct device *dev) | |
666 | { | |
667 | kfree(dev); | |
668 | } | |
669 | ||
670 | static struct class wmi_class = { | |
671 | .name = "wmi", | |
672 | .dev_release = wmi_dev_free, | |
673 | .dev_uevent = wmi_dev_uevent, | |
674 | }; | |
675 | ||
676 | static int wmi_create_devs(void) | |
677 | { | |
678 | int result; | |
679 | char guid_string[37]; | |
680 | struct guid_block *gblock; | |
681 | struct wmi_block *wblock; | |
682 | struct list_head *p; | |
683 | struct device *guid_dev; | |
684 | ||
685 | /* Create devices for all the GUIDs */ | |
686 | list_for_each(p, &wmi_blocks.list) { | |
687 | wblock = list_entry(p, struct wmi_block, list); | |
688 | ||
689 | guid_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
690 | if (!guid_dev) | |
691 | return -ENOMEM; | |
692 | ||
693 | wblock->dev = guid_dev; | |
694 | ||
695 | guid_dev->class = &wmi_class; | |
696 | dev_set_drvdata(guid_dev, wblock); | |
697 | ||
698 | gblock = &wblock->gblock; | |
699 | ||
700 | wmi_gtoa(gblock->guid, guid_string); | |
701 | dev_set_name(guid_dev, guid_string); | |
702 | ||
703 | result = device_register(guid_dev); | |
704 | if (result) | |
705 | return result; | |
706 | ||
707 | result = device_create_file(guid_dev, &dev_attr_modalias); | |
708 | if (result) | |
709 | return result; | |
710 | } | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static void wmi_remove_devs(void) | |
716 | { | |
717 | struct guid_block *gblock; | |
718 | struct wmi_block *wblock; | |
719 | struct list_head *p; | |
720 | struct device *guid_dev; | |
721 | ||
722 | /* Delete devices for all the GUIDs */ | |
723 | list_for_each(p, &wmi_blocks.list) { | |
724 | wblock = list_entry(p, struct wmi_block, list); | |
725 | ||
726 | guid_dev = wblock->dev; | |
727 | gblock = &wblock->gblock; | |
728 | ||
729 | device_remove_file(guid_dev, &dev_attr_modalias); | |
730 | ||
731 | device_unregister(guid_dev); | |
732 | } | |
733 | } | |
734 | ||
735 | static void wmi_class_exit(void) | |
736 | { | |
737 | wmi_remove_devs(); | |
738 | class_unregister(&wmi_class); | |
739 | } | |
740 | ||
741 | static int wmi_class_init(void) | |
742 | { | |
743 | int ret; | |
744 | ||
745 | ret = class_register(&wmi_class); | |
746 | if (ret) | |
747 | return ret; | |
748 | ||
749 | ret = wmi_create_devs(); | |
750 | if (ret) | |
751 | wmi_class_exit(); | |
752 | ||
753 | return ret; | |
754 | } | |
755 | ||
d1f9e497 CC |
756 | static bool guid_already_parsed(const char *guid_string) |
757 | { | |
758 | struct guid_block *gblock; | |
759 | struct wmi_block *wblock; | |
760 | struct list_head *p; | |
761 | ||
762 | list_for_each(p, &wmi_blocks.list) { | |
763 | wblock = list_entry(p, struct wmi_block, list); | |
764 | gblock = &wblock->gblock; | |
765 | ||
766 | if (strncmp(gblock->guid, guid_string, 16) == 0) | |
767 | return true; | |
768 | } | |
769 | return false; | |
770 | } | |
771 | ||
bff431e4 CC |
772 | /* |
773 | * Parse the _WDG method for the GUID data blocks | |
774 | */ | |
775 | static __init acpi_status parse_wdg(acpi_handle handle) | |
776 | { | |
777 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
778 | union acpi_object *obj; | |
779 | struct guid_block *gblock; | |
780 | struct wmi_block *wblock; | |
d1f9e497 | 781 | char guid_string[37]; |
bff431e4 CC |
782 | acpi_status status; |
783 | u32 i, total; | |
784 | ||
785 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
786 | ||
787 | if (ACPI_FAILURE(status)) | |
788 | return status; | |
789 | ||
790 | obj = (union acpi_object *) out.pointer; | |
791 | ||
792 | if (obj->type != ACPI_TYPE_BUFFER) | |
793 | return AE_ERROR; | |
794 | ||
795 | total = obj->buffer.length / sizeof(struct guid_block); | |
796 | ||
2c6719a3 | 797 | gblock = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); |
bff431e4 CC |
798 | if (!gblock) |
799 | return AE_NO_MEMORY; | |
800 | ||
bff431e4 | 801 | for (i = 0; i < total; i++) { |
d1f9e497 CC |
802 | /* |
803 | Some WMI devices, like those for nVidia hooks, have a | |
804 | duplicate GUID. It's not clear what we should do in this | |
805 | case yet, so for now, we'll just ignore the duplicate. | |
806 | Anyone who wants to add support for that device can come | |
807 | up with a better workaround for the mess then. | |
808 | */ | |
809 | if (guid_already_parsed(gblock[i].guid) == true) { | |
810 | wmi_gtoa(gblock[i].guid, guid_string); | |
811 | printk(KERN_INFO PREFIX "Skipping duplicate GUID %s\n", | |
812 | guid_string); | |
813 | continue; | |
814 | } | |
bff431e4 CC |
815 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
816 | if (!wblock) | |
817 | return AE_NO_MEMORY; | |
818 | ||
819 | wblock->gblock = gblock[i]; | |
820 | wblock->handle = handle; | |
fc3155b2 TR |
821 | if (debug_event) { |
822 | wblock->handler = wmi_notify_debug; | |
823 | status = wmi_method_enable(wblock, 1); | |
824 | } | |
bff431e4 CC |
825 | list_add_tail(&wblock->list, &wmi_blocks.list); |
826 | } | |
827 | ||
828 | kfree(out.pointer); | |
829 | kfree(gblock); | |
830 | ||
831 | return status; | |
832 | } | |
833 | ||
834 | /* | |
835 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
836 | * hand these off to the EC driver. | |
837 | */ | |
838 | static acpi_status | |
839 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 840 | u32 bits, u64 *value, |
bff431e4 CC |
841 | void *handler_context, void *region_context) |
842 | { | |
843 | int result = 0, i = 0; | |
844 | u8 temp = 0; | |
845 | ||
846 | if ((address > 0xFF) || !value) | |
847 | return AE_BAD_PARAMETER; | |
848 | ||
849 | if (function != ACPI_READ && function != ACPI_WRITE) | |
850 | return AE_BAD_PARAMETER; | |
851 | ||
852 | if (bits != 8) | |
853 | return AE_BAD_PARAMETER; | |
854 | ||
855 | if (function == ACPI_READ) { | |
856 | result = ec_read(address, &temp); | |
439913ff | 857 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
858 | } else { |
859 | temp = 0xff & ((*value) >> i); | |
860 | result = ec_write(address, temp); | |
861 | } | |
862 | ||
863 | switch (result) { | |
864 | case -EINVAL: | |
865 | return AE_BAD_PARAMETER; | |
866 | break; | |
867 | case -ENODEV: | |
868 | return AE_NOT_FOUND; | |
869 | break; | |
870 | case -ETIME: | |
871 | return AE_TIME; | |
872 | break; | |
873 | default: | |
874 | return AE_OK; | |
875 | } | |
876 | } | |
877 | ||
f61bb939 | 878 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
879 | { |
880 | struct guid_block *block; | |
881 | struct wmi_block *wblock; | |
882 | struct list_head *p; | |
bff431e4 CC |
883 | |
884 | list_for_each(p, &wmi_blocks.list) { | |
885 | wblock = list_entry(p, struct wmi_block, list); | |
886 | block = &wblock->gblock; | |
887 | ||
888 | if ((block->flags & ACPI_WMI_EVENT) && | |
889 | (block->notify_id == event)) { | |
890 | if (wblock->handler) | |
891 | wblock->handler(event, wblock->handler_data); | |
892 | ||
893 | acpi_bus_generate_netlink_event( | |
0794469d | 894 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
895 | event, 0); |
896 | break; | |
897 | } | |
898 | } | |
899 | } | |
900 | ||
901 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
902 | { | |
bff431e4 CC |
903 | acpi_remove_address_space_handler(device->handle, |
904 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | static int __init acpi_wmi_add(struct acpi_device *device) | |
910 | { | |
911 | acpi_status status; | |
912 | int result = 0; | |
913 | ||
bff431e4 CC |
914 | status = acpi_install_address_space_handler(device->handle, |
915 | ACPI_ADR_SPACE_EC, | |
916 | &acpi_wmi_ec_space_handler, | |
917 | NULL, NULL); | |
918 | if (ACPI_FAILURE(status)) | |
919 | return -ENODEV; | |
920 | ||
921 | status = parse_wdg(device->handle); | |
922 | if (ACPI_FAILURE(status)) { | |
923 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
924 | return -ENODEV; | |
925 | } | |
926 | ||
927 | return result; | |
928 | } | |
929 | ||
930 | static int __init acpi_wmi_init(void) | |
931 | { | |
da511997 | 932 | int result; |
bff431e4 | 933 | |
96b5a46e LT |
934 | INIT_LIST_HEAD(&wmi_blocks.list); |
935 | ||
bff431e4 CC |
936 | if (acpi_disabled) |
937 | return -ENODEV; | |
938 | ||
bff431e4 CC |
939 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
940 | ||
941 | if (result < 0) { | |
942 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
1caab3c1 MG |
943 | return -ENODEV; |
944 | } | |
945 | ||
946 | result = wmi_class_init(); | |
947 | if (result) { | |
948 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
949 | return result; | |
bff431e4 CC |
950 | } |
951 | ||
1caab3c1 MG |
952 | printk(KERN_INFO PREFIX "Mapper loaded\n"); |
953 | ||
bff431e4 CC |
954 | return result; |
955 | } | |
956 | ||
957 | static void __exit acpi_wmi_exit(void) | |
958 | { | |
959 | struct list_head *p, *tmp; | |
960 | struct wmi_block *wblock; | |
961 | ||
1caab3c1 MG |
962 | wmi_class_exit(); |
963 | ||
bff431e4 CC |
964 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
965 | ||
966 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
967 | wblock = list_entry(p, struct wmi_block, list); | |
968 | ||
969 | list_del(p); | |
970 | kfree(wblock); | |
971 | } | |
972 | ||
973 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
974 | } | |
975 | ||
976 | subsys_initcall(acpi_wmi_init); | |
977 | module_exit(acpi_wmi_exit); |