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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 | ||
a929aae0 TR |
89 | static int debug_dump_wdg; |
90 | module_param(debug_dump_wdg, bool, 0444); | |
91 | MODULE_PARM_DESC(debug_dump_wdg, | |
92 | "Dump available WMI interfaces [0/1]"); | |
93 | ||
bff431e4 CC |
94 | static int acpi_wmi_remove(struct acpi_device *device, int type); |
95 | static int acpi_wmi_add(struct acpi_device *device); | |
f61bb939 | 96 | static void acpi_wmi_notify(struct acpi_device *device, u32 event); |
bff431e4 CC |
97 | |
98 | static const struct acpi_device_id wmi_device_ids[] = { | |
99 | {"PNP0C14", 0}, | |
100 | {"pnp0c14", 0}, | |
101 | {"", 0}, | |
102 | }; | |
103 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
104 | ||
105 | static struct acpi_driver acpi_wmi_driver = { | |
106 | .name = "wmi", | |
107 | .class = ACPI_WMI_CLASS, | |
108 | .ids = wmi_device_ids, | |
109 | .ops = { | |
110 | .add = acpi_wmi_add, | |
111 | .remove = acpi_wmi_remove, | |
f61bb939 | 112 | .notify = acpi_wmi_notify, |
bff431e4 CC |
113 | }, |
114 | }; | |
115 | ||
116 | /* | |
117 | * GUID parsing functions | |
118 | */ | |
119 | ||
120 | /** | |
121 | * wmi_parse_hexbyte - Convert a ASCII hex number to a byte | |
122 | * @src: Pointer to at least 2 characters to convert. | |
123 | * | |
124 | * Convert a two character ASCII hex string to a number. | |
125 | * | |
126 | * Return: 0-255 Success, the byte was parsed correctly | |
127 | * -1 Error, an invalid character was supplied | |
128 | */ | |
129 | static int wmi_parse_hexbyte(const u8 *src) | |
130 | { | |
bff431e4 | 131 | int h; |
392bd8b5 | 132 | int value; |
bff431e4 CC |
133 | |
134 | /* high part */ | |
392bd8b5 AS |
135 | h = value = hex_to_bin(src[0]); |
136 | if (value < 0) | |
bff431e4 | 137 | return -1; |
bff431e4 CC |
138 | |
139 | /* low part */ | |
392bd8b5 AS |
140 | value = hex_to_bin(src[1]); |
141 | if (value >= 0) | |
142 | return (h << 4) | value; | |
bff431e4 CC |
143 | return -1; |
144 | } | |
145 | ||
146 | /** | |
147 | * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary | |
148 | * @src: Memory block holding binary GUID (16 bytes) | |
149 | * @dest: Memory block to hold byte swapped binary GUID (16 bytes) | |
150 | * | |
151 | * Byte swap a binary GUID to match it's real GUID value | |
152 | */ | |
153 | static void wmi_swap_bytes(u8 *src, u8 *dest) | |
154 | { | |
155 | int i; | |
156 | ||
157 | for (i = 0; i <= 3; i++) | |
158 | memcpy(dest + i, src + (3 - i), 1); | |
159 | ||
160 | for (i = 0; i <= 1; i++) | |
161 | memcpy(dest + 4 + i, src + (5 - i), 1); | |
162 | ||
163 | for (i = 0; i <= 1; i++) | |
164 | memcpy(dest + 6 + i, src + (7 - i), 1); | |
165 | ||
166 | memcpy(dest + 8, src + 8, 8); | |
167 | } | |
168 | ||
169 | /** | |
170 | * wmi_parse_guid - Convert GUID from ASCII to binary | |
171 | * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
172 | * @dest: Memory block to hold binary GUID (16 bytes) | |
173 | * | |
174 | * N.B. The GUID need not be NULL terminated. | |
175 | * | |
176 | * Return: 'true' @dest contains binary GUID | |
177 | * 'false' @dest contents are undefined | |
178 | */ | |
179 | static bool wmi_parse_guid(const u8 *src, u8 *dest) | |
180 | { | |
181 | static const int size[] = { 4, 2, 2, 2, 6 }; | |
182 | int i, j, v; | |
183 | ||
184 | if (src[8] != '-' || src[13] != '-' || | |
185 | src[18] != '-' || src[23] != '-') | |
186 | return false; | |
187 | ||
188 | for (j = 0; j < 5; j++, src++) { | |
189 | for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) { | |
190 | v = wmi_parse_hexbyte(src); | |
191 | if (v < 0) | |
192 | return false; | |
193 | } | |
194 | } | |
195 | ||
196 | return true; | |
197 | } | |
198 | ||
1caab3c1 MG |
199 | /* |
200 | * Convert a raw GUID to the ACII string representation | |
201 | */ | |
202 | static int wmi_gtoa(const char *in, char *out) | |
203 | { | |
204 | int i; | |
205 | ||
206 | for (i = 3; i >= 0; i--) | |
207 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
208 | ||
209 | out += sprintf(out, "-"); | |
210 | out += sprintf(out, "%02X", in[5] & 0xFF); | |
211 | out += sprintf(out, "%02X", in[4] & 0xFF); | |
212 | out += sprintf(out, "-"); | |
213 | out += sprintf(out, "%02X", in[7] & 0xFF); | |
214 | out += sprintf(out, "%02X", in[6] & 0xFF); | |
215 | out += sprintf(out, "-"); | |
216 | out += sprintf(out, "%02X", in[8] & 0xFF); | |
217 | out += sprintf(out, "%02X", in[9] & 0xFF); | |
218 | out += sprintf(out, "-"); | |
219 | ||
220 | for (i = 10; i <= 15; i++) | |
221 | out += sprintf(out, "%02X", in[i] & 0xFF); | |
222 | ||
223 | out = '\0'; | |
224 | return 0; | |
225 | } | |
226 | ||
bff431e4 CC |
227 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
228 | { | |
229 | char tmp[16], guid_input[16]; | |
230 | struct wmi_block *wblock; | |
231 | struct guid_block *block; | |
232 | struct list_head *p; | |
233 | ||
234 | wmi_parse_guid(guid_string, tmp); | |
235 | wmi_swap_bytes(tmp, guid_input); | |
236 | ||
237 | list_for_each(p, &wmi_blocks.list) { | |
238 | wblock = list_entry(p, struct wmi_block, list); | |
239 | block = &wblock->gblock; | |
240 | ||
241 | if (memcmp(block->guid, guid_input, 16) == 0) { | |
242 | if (out) | |
243 | *out = wblock; | |
244 | return 1; | |
245 | } | |
246 | } | |
247 | return 0; | |
248 | } | |
249 | ||
a66bfa7a MG |
250 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
251 | { | |
252 | struct guid_block *block = NULL; | |
253 | char method[5]; | |
254 | struct acpi_object_list input; | |
255 | union acpi_object params[1]; | |
256 | acpi_status status; | |
257 | acpi_handle handle; | |
258 | ||
259 | block = &wblock->gblock; | |
260 | handle = wblock->handle; | |
261 | ||
262 | if (!block) | |
263 | return AE_NOT_EXIST; | |
264 | ||
265 | input.count = 1; | |
266 | input.pointer = params; | |
267 | params[0].type = ACPI_TYPE_INTEGER; | |
268 | params[0].integer.value = enable; | |
269 | ||
270 | snprintf(method, 5, "WE%02X", block->notify_id); | |
271 | status = acpi_evaluate_object(handle, method, &input, NULL); | |
272 | ||
273 | if (status != AE_OK && status != AE_NOT_FOUND) | |
274 | return status; | |
275 | else | |
276 | return AE_OK; | |
277 | } | |
278 | ||
bff431e4 CC |
279 | /* |
280 | * Exported WMI functions | |
281 | */ | |
282 | /** | |
283 | * wmi_evaluate_method - Evaluate a WMI method | |
284 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
285 | * @instance: Instance index | |
286 | * @method_id: Method ID to call | |
287 | * &in: Buffer containing input for the method call | |
288 | * &out: Empty buffer to return the method results | |
289 | * | |
290 | * Call an ACPI-WMI method | |
291 | */ | |
292 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
293 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
294 | { | |
295 | struct guid_block *block = NULL; | |
296 | struct wmi_block *wblock = NULL; | |
297 | acpi_handle handle; | |
298 | acpi_status status; | |
299 | struct acpi_object_list input; | |
300 | union acpi_object params[3]; | |
f3d83e24 | 301 | char method[5] = "WM"; |
bff431e4 CC |
302 | |
303 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 304 | return AE_ERROR; |
bff431e4 CC |
305 | |
306 | block = &wblock->gblock; | |
307 | handle = wblock->handle; | |
308 | ||
e6bafba5 | 309 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
310 | return AE_BAD_DATA; |
311 | ||
312 | if (block->instance_count < instance) | |
313 | return AE_BAD_PARAMETER; | |
314 | ||
315 | input.count = 2; | |
316 | input.pointer = params; | |
317 | params[0].type = ACPI_TYPE_INTEGER; | |
318 | params[0].integer.value = instance; | |
319 | params[1].type = ACPI_TYPE_INTEGER; | |
320 | params[1].integer.value = method_id; | |
321 | ||
322 | if (in) { | |
323 | input.count = 3; | |
324 | ||
325 | if (block->flags & ACPI_WMI_STRING) { | |
326 | params[2].type = ACPI_TYPE_STRING; | |
327 | } else { | |
328 | params[2].type = ACPI_TYPE_BUFFER; | |
329 | } | |
330 | params[2].buffer.length = in->length; | |
331 | params[2].buffer.pointer = in->pointer; | |
332 | } | |
333 | ||
334 | strncat(method, block->object_id, 2); | |
335 | ||
336 | status = acpi_evaluate_object(handle, method, &input, out); | |
337 | ||
338 | return status; | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
341 | ||
342 | /** | |
343 | * wmi_query_block - Return contents of a WMI block | |
344 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
345 | * @instance: Instance index | |
346 | * &out: Empty buffer to return the contents of the data block to | |
347 | * | |
348 | * Return the contents of an ACPI-WMI data block to a buffer | |
349 | */ | |
350 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
351 | struct acpi_buffer *out) | |
352 | { | |
353 | struct guid_block *block = NULL; | |
354 | struct wmi_block *wblock = NULL; | |
a527f2d7 | 355 | acpi_handle handle, wc_handle; |
bff431e4 CC |
356 | acpi_status status, wc_status = AE_ERROR; |
357 | struct acpi_object_list input, wc_input; | |
358 | union acpi_object wc_params[1], wq_params[1]; | |
f3d83e24 CL |
359 | char method[5]; |
360 | char wc_method[5] = "WC"; | |
bff431e4 CC |
361 | |
362 | if (!guid_string || !out) | |
363 | return AE_BAD_PARAMETER; | |
364 | ||
365 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 366 | return AE_ERROR; |
bff431e4 CC |
367 | |
368 | block = &wblock->gblock; | |
369 | handle = wblock->handle; | |
370 | ||
371 | if (block->instance_count < instance) | |
372 | return AE_BAD_PARAMETER; | |
373 | ||
374 | /* Check GUID is a data block */ | |
375 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 376 | return AE_ERROR; |
bff431e4 CC |
377 | |
378 | input.count = 1; | |
379 | input.pointer = wq_params; | |
380 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
381 | wq_params[0].integer.value = instance; | |
382 | ||
383 | /* | |
384 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
385 | * enable collection. | |
386 | */ | |
387 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
388 | wc_input.count = 1; | |
389 | wc_input.pointer = wc_params; | |
390 | wc_params[0].type = ACPI_TYPE_INTEGER; | |
391 | wc_params[0].integer.value = 1; | |
392 | ||
393 | strncat(wc_method, block->object_id, 2); | |
394 | ||
395 | /* | |
396 | * Some GUIDs break the specification by declaring themselves | |
397 | * expensive, but have no corresponding WCxx method. So we | |
398 | * should not fail if this happens. | |
399 | */ | |
a527f2d7 CC |
400 | wc_status = acpi_get_handle(handle, wc_method, &wc_handle); |
401 | if (ACPI_SUCCESS(wc_status)) | |
402 | wc_status = acpi_evaluate_object(handle, wc_method, | |
403 | &wc_input, NULL); | |
bff431e4 CC |
404 | } |
405 | ||
406 | strcpy(method, "WQ"); | |
407 | strncat(method, block->object_id, 2); | |
408 | ||
dab36ad8 | 409 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
410 | |
411 | /* | |
412 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
413 | * the WQxx method failed - we should disable collection anyway. | |
414 | */ | |
a527f2d7 | 415 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
bff431e4 CC |
416 | wc_params[0].integer.value = 0; |
417 | status = acpi_evaluate_object(handle, | |
418 | wc_method, &wc_input, NULL); | |
419 | } | |
420 | ||
421 | return status; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(wmi_query_block); | |
424 | ||
425 | /** | |
426 | * wmi_set_block - Write to a WMI block | |
427 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
428 | * @instance: Instance index | |
429 | * &in: Buffer containing new values for the data block | |
430 | * | |
431 | * Write the contents of the input buffer to an ACPI-WMI data block | |
432 | */ | |
433 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
434 | const struct acpi_buffer *in) | |
435 | { | |
436 | struct guid_block *block = NULL; | |
437 | struct wmi_block *wblock = NULL; | |
438 | acpi_handle handle; | |
439 | struct acpi_object_list input; | |
440 | union acpi_object params[2]; | |
f3d83e24 | 441 | char method[5] = "WS"; |
bff431e4 CC |
442 | |
443 | if (!guid_string || !in) | |
444 | return AE_BAD_DATA; | |
445 | ||
446 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 447 | return AE_ERROR; |
bff431e4 CC |
448 | |
449 | block = &wblock->gblock; | |
450 | handle = wblock->handle; | |
451 | ||
452 | if (block->instance_count < instance) | |
453 | return AE_BAD_PARAMETER; | |
454 | ||
455 | /* Check GUID is a data block */ | |
456 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 457 | return AE_ERROR; |
bff431e4 CC |
458 | |
459 | input.count = 2; | |
460 | input.pointer = params; | |
461 | params[0].type = ACPI_TYPE_INTEGER; | |
462 | params[0].integer.value = instance; | |
463 | ||
464 | if (block->flags & ACPI_WMI_STRING) { | |
465 | params[1].type = ACPI_TYPE_STRING; | |
466 | } else { | |
467 | params[1].type = ACPI_TYPE_BUFFER; | |
468 | } | |
469 | params[1].buffer.length = in->length; | |
470 | params[1].buffer.pointer = in->pointer; | |
471 | ||
472 | strncat(method, block->object_id, 2); | |
473 | ||
474 | return acpi_evaluate_object(handle, method, &input, NULL); | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
477 | ||
a929aae0 TR |
478 | static void wmi_dump_wdg(struct guid_block *g) |
479 | { | |
480 | char guid_string[37]; | |
481 | ||
482 | wmi_gtoa(g->guid, guid_string); | |
483 | printk(KERN_INFO PREFIX "%s:\n", guid_string); | |
484 | printk(KERN_INFO PREFIX "\tobject_id: %c%c\n", | |
485 | g->object_id[0], g->object_id[1]); | |
486 | printk(KERN_INFO PREFIX "\tnotify_id: %02X\n", g->notify_id); | |
487 | printk(KERN_INFO PREFIX "\treserved: %02X\n", g->reserved); | |
488 | printk(KERN_INFO PREFIX "\tinstance_count: %d\n", g->instance_count); | |
489 | printk(KERN_INFO PREFIX "\tflags: %#x", g->flags); | |
490 | if (g->flags) { | |
491 | printk(" "); | |
492 | if (g->flags & ACPI_WMI_EXPENSIVE) | |
493 | printk("ACPI_WMI_EXPENSIVE "); | |
494 | if (g->flags & ACPI_WMI_METHOD) | |
495 | printk("ACPI_WMI_METHOD "); | |
496 | if (g->flags & ACPI_WMI_STRING) | |
497 | printk("ACPI_WMI_STRING "); | |
498 | if (g->flags & ACPI_WMI_EVENT) | |
499 | printk("ACPI_WMI_EVENT "); | |
500 | } | |
501 | printk("\n"); | |
502 | ||
503 | } | |
504 | ||
fc3155b2 TR |
505 | static void wmi_notify_debug(u32 value, void *context) |
506 | { | |
507 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
508 | union acpi_object *obj; | |
1492616a | 509 | acpi_status status; |
fc3155b2 | 510 | |
1492616a AL |
511 | status = wmi_get_event_data(value, &response); |
512 | if (status != AE_OK) { | |
513 | printk(KERN_INFO "wmi: bad event status 0x%x\n", status); | |
514 | return; | |
515 | } | |
fc3155b2 TR |
516 | |
517 | obj = (union acpi_object *)response.pointer; | |
518 | ||
519 | if (!obj) | |
520 | return; | |
521 | ||
522 | printk(KERN_INFO PREFIX "DEBUG Event "); | |
523 | switch(obj->type) { | |
524 | case ACPI_TYPE_BUFFER: | |
525 | printk("BUFFER_TYPE - length %d\n", obj->buffer.length); | |
526 | break; | |
527 | case ACPI_TYPE_STRING: | |
528 | printk("STRING_TYPE - %s\n", obj->string.pointer); | |
529 | break; | |
530 | case ACPI_TYPE_INTEGER: | |
531 | printk("INTEGER_TYPE - %llu\n", obj->integer.value); | |
532 | break; | |
533 | case ACPI_TYPE_PACKAGE: | |
534 | printk("PACKAGE_TYPE - %d elements\n", obj->package.count); | |
535 | break; | |
536 | default: | |
537 | printk("object type 0x%X\n", obj->type); | |
538 | } | |
1492616a | 539 | kfree(obj); |
fc3155b2 TR |
540 | } |
541 | ||
bff431e4 CC |
542 | /** |
543 | * wmi_install_notify_handler - Register handler for WMI events | |
544 | * @handler: Function to handle notifications | |
545 | * @data: Data to be returned to handler when event is fired | |
546 | * | |
547 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
548 | */ | |
549 | acpi_status wmi_install_notify_handler(const char *guid, | |
550 | wmi_notify_handler handler, void *data) | |
551 | { | |
552 | struct wmi_block *block; | |
a66bfa7a | 553 | acpi_status status; |
bff431e4 CC |
554 | |
555 | if (!guid || !handler) | |
556 | return AE_BAD_PARAMETER; | |
557 | ||
c03b26a5 | 558 | if (!find_guid(guid, &block)) |
bff431e4 CC |
559 | return AE_NOT_EXIST; |
560 | ||
fc3155b2 | 561 | if (block->handler && block->handler != wmi_notify_debug) |
bff431e4 CC |
562 | return AE_ALREADY_ACQUIRED; |
563 | ||
564 | block->handler = handler; | |
565 | block->handler_data = data; | |
566 | ||
a66bfa7a MG |
567 | status = wmi_method_enable(block, 1); |
568 | ||
569 | return status; | |
bff431e4 CC |
570 | } |
571 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
572 | ||
573 | /** | |
574 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
575 | * | |
576 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
577 | */ | |
578 | acpi_status wmi_remove_notify_handler(const char *guid) | |
579 | { | |
580 | struct wmi_block *block; | |
fc3155b2 | 581 | acpi_status status = AE_OK; |
bff431e4 CC |
582 | |
583 | if (!guid) | |
584 | return AE_BAD_PARAMETER; | |
585 | ||
c03b26a5 | 586 | if (!find_guid(guid, &block)) |
bff431e4 CC |
587 | return AE_NOT_EXIST; |
588 | ||
fc3155b2 | 589 | if (!block->handler || block->handler == wmi_notify_debug) |
bff431e4 CC |
590 | return AE_NULL_ENTRY; |
591 | ||
fc3155b2 TR |
592 | if (debug_event) { |
593 | block->handler = wmi_notify_debug; | |
594 | } else { | |
595 | status = wmi_method_enable(block, 0); | |
596 | block->handler = NULL; | |
597 | block->handler_data = NULL; | |
598 | } | |
a66bfa7a | 599 | return status; |
bff431e4 CC |
600 | } |
601 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
602 | ||
603 | /** | |
604 | * wmi_get_event_data - Get WMI data associated with an event | |
605 | * | |
3e9b988e AA |
606 | * @event: Event to find |
607 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
608 | * |
609 | * Returns extra data associated with an event in WMI. | |
610 | */ | |
611 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
612 | { | |
613 | struct acpi_object_list input; | |
614 | union acpi_object params[1]; | |
615 | struct guid_block *gblock; | |
616 | struct wmi_block *wblock; | |
617 | struct list_head *p; | |
618 | ||
619 | input.count = 1; | |
620 | input.pointer = params; | |
621 | params[0].type = ACPI_TYPE_INTEGER; | |
622 | params[0].integer.value = event; | |
623 | ||
624 | list_for_each(p, &wmi_blocks.list) { | |
625 | wblock = list_entry(p, struct wmi_block, list); | |
626 | gblock = &wblock->gblock; | |
627 | ||
628 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
629 | (gblock->notify_id == event)) | |
630 | return acpi_evaluate_object(wblock->handle, "_WED", | |
631 | &input, out); | |
632 | } | |
633 | ||
634 | return AE_NOT_FOUND; | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
637 | ||
638 | /** | |
639 | * wmi_has_guid - Check if a GUID is available | |
640 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
641 | * | |
642 | * Check if a given GUID is defined by _WDG | |
643 | */ | |
644 | bool wmi_has_guid(const char *guid_string) | |
645 | { | |
646 | return find_guid(guid_string, NULL); | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
649 | ||
1caab3c1 MG |
650 | /* |
651 | * sysfs interface | |
652 | */ | |
653 | static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, | |
654 | char *buf) | |
655 | { | |
656 | char guid_string[37]; | |
657 | struct wmi_block *wblock; | |
658 | ||
659 | wblock = dev_get_drvdata(dev); | |
660 | if (!wblock) | |
661 | return -ENOMEM; | |
662 | ||
663 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
664 | ||
665 | return sprintf(buf, "wmi:%s\n", guid_string); | |
666 | } | |
667 | static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); | |
668 | ||
669 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
670 | { | |
671 | char guid_string[37]; | |
672 | ||
673 | struct wmi_block *wblock; | |
674 | ||
675 | if (add_uevent_var(env, "MODALIAS=")) | |
676 | return -ENOMEM; | |
677 | ||
678 | wblock = dev_get_drvdata(dev); | |
679 | if (!wblock) | |
680 | return -ENOMEM; | |
681 | ||
682 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
683 | ||
684 | strcpy(&env->buf[env->buflen - 1], "wmi:"); | |
685 | memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); | |
686 | env->buflen += 40; | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | static void wmi_dev_free(struct device *dev) | |
692 | { | |
693 | kfree(dev); | |
694 | } | |
695 | ||
696 | static struct class wmi_class = { | |
697 | .name = "wmi", | |
698 | .dev_release = wmi_dev_free, | |
699 | .dev_uevent = wmi_dev_uevent, | |
700 | }; | |
701 | ||
702 | static int wmi_create_devs(void) | |
703 | { | |
704 | int result; | |
705 | char guid_string[37]; | |
706 | struct guid_block *gblock; | |
707 | struct wmi_block *wblock; | |
708 | struct list_head *p; | |
709 | struct device *guid_dev; | |
710 | ||
711 | /* Create devices for all the GUIDs */ | |
712 | list_for_each(p, &wmi_blocks.list) { | |
713 | wblock = list_entry(p, struct wmi_block, list); | |
714 | ||
715 | guid_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
716 | if (!guid_dev) | |
717 | return -ENOMEM; | |
718 | ||
719 | wblock->dev = guid_dev; | |
720 | ||
721 | guid_dev->class = &wmi_class; | |
722 | dev_set_drvdata(guid_dev, wblock); | |
723 | ||
724 | gblock = &wblock->gblock; | |
725 | ||
726 | wmi_gtoa(gblock->guid, guid_string); | |
727 | dev_set_name(guid_dev, guid_string); | |
728 | ||
729 | result = device_register(guid_dev); | |
730 | if (result) | |
731 | return result; | |
732 | ||
733 | result = device_create_file(guid_dev, &dev_attr_modalias); | |
734 | if (result) | |
735 | return result; | |
736 | } | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
741 | static void wmi_remove_devs(void) | |
742 | { | |
743 | struct guid_block *gblock; | |
744 | struct wmi_block *wblock; | |
745 | struct list_head *p; | |
746 | struct device *guid_dev; | |
747 | ||
748 | /* Delete devices for all the GUIDs */ | |
749 | list_for_each(p, &wmi_blocks.list) { | |
750 | wblock = list_entry(p, struct wmi_block, list); | |
751 | ||
752 | guid_dev = wblock->dev; | |
753 | gblock = &wblock->gblock; | |
754 | ||
755 | device_remove_file(guid_dev, &dev_attr_modalias); | |
756 | ||
757 | device_unregister(guid_dev); | |
758 | } | |
759 | } | |
760 | ||
761 | static void wmi_class_exit(void) | |
762 | { | |
763 | wmi_remove_devs(); | |
764 | class_unregister(&wmi_class); | |
765 | } | |
766 | ||
767 | static int wmi_class_init(void) | |
768 | { | |
769 | int ret; | |
770 | ||
771 | ret = class_register(&wmi_class); | |
772 | if (ret) | |
773 | return ret; | |
774 | ||
775 | ret = wmi_create_devs(); | |
776 | if (ret) | |
777 | wmi_class_exit(); | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
d1f9e497 CC |
782 | static bool guid_already_parsed(const char *guid_string) |
783 | { | |
784 | struct guid_block *gblock; | |
785 | struct wmi_block *wblock; | |
786 | struct list_head *p; | |
787 | ||
788 | list_for_each(p, &wmi_blocks.list) { | |
789 | wblock = list_entry(p, struct wmi_block, list); | |
790 | gblock = &wblock->gblock; | |
791 | ||
792 | if (strncmp(gblock->guid, guid_string, 16) == 0) | |
793 | return true; | |
794 | } | |
795 | return false; | |
796 | } | |
797 | ||
bff431e4 CC |
798 | /* |
799 | * Parse the _WDG method for the GUID data blocks | |
800 | */ | |
925b1089 | 801 | static acpi_status parse_wdg(acpi_handle handle) |
bff431e4 CC |
802 | { |
803 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
804 | union acpi_object *obj; | |
805 | struct guid_block *gblock; | |
806 | struct wmi_block *wblock; | |
d1f9e497 | 807 | char guid_string[37]; |
bff431e4 CC |
808 | acpi_status status; |
809 | u32 i, total; | |
810 | ||
811 | status = acpi_evaluate_object(handle, "_WDG", NULL, &out); | |
812 | ||
813 | if (ACPI_FAILURE(status)) | |
814 | return status; | |
815 | ||
816 | obj = (union acpi_object *) out.pointer; | |
817 | ||
818 | if (obj->type != ACPI_TYPE_BUFFER) | |
819 | return AE_ERROR; | |
820 | ||
821 | total = obj->buffer.length / sizeof(struct guid_block); | |
822 | ||
2c6719a3 | 823 | gblock = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); |
a5167c5b AL |
824 | if (!gblock) { |
825 | status = AE_NO_MEMORY; | |
826 | goto out_free_pointer; | |
827 | } | |
bff431e4 | 828 | |
bff431e4 | 829 | for (i = 0; i < total; i++) { |
d1f9e497 CC |
830 | /* |
831 | Some WMI devices, like those for nVidia hooks, have a | |
832 | duplicate GUID. It's not clear what we should do in this | |
833 | case yet, so for now, we'll just ignore the duplicate. | |
834 | Anyone who wants to add support for that device can come | |
835 | up with a better workaround for the mess then. | |
836 | */ | |
837 | if (guid_already_parsed(gblock[i].guid) == true) { | |
838 | wmi_gtoa(gblock[i].guid, guid_string); | |
839 | printk(KERN_INFO PREFIX "Skipping duplicate GUID %s\n", | |
840 | guid_string); | |
841 | continue; | |
842 | } | |
a929aae0 TR |
843 | if (debug_dump_wdg) |
844 | wmi_dump_wdg(&gblock[i]); | |
845 | ||
bff431e4 | 846 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
a5167c5b AL |
847 | if (!wblock) { |
848 | status = AE_NO_MEMORY; | |
849 | goto out_free_gblock; | |
850 | } | |
bff431e4 CC |
851 | |
852 | wblock->gblock = gblock[i]; | |
853 | wblock->handle = handle; | |
fc3155b2 TR |
854 | if (debug_event) { |
855 | wblock->handler = wmi_notify_debug; | |
856 | status = wmi_method_enable(wblock, 1); | |
857 | } | |
bff431e4 CC |
858 | list_add_tail(&wblock->list, &wmi_blocks.list); |
859 | } | |
860 | ||
a5167c5b | 861 | out_free_gblock: |
bff431e4 | 862 | kfree(gblock); |
a5167c5b AL |
863 | out_free_pointer: |
864 | kfree(out.pointer); | |
bff431e4 CC |
865 | |
866 | return status; | |
867 | } | |
868 | ||
869 | /* | |
870 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
871 | * hand these off to the EC driver. | |
872 | */ | |
873 | static acpi_status | |
874 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 875 | u32 bits, u64 *value, |
bff431e4 CC |
876 | void *handler_context, void *region_context) |
877 | { | |
878 | int result = 0, i = 0; | |
879 | u8 temp = 0; | |
880 | ||
881 | if ((address > 0xFF) || !value) | |
882 | return AE_BAD_PARAMETER; | |
883 | ||
884 | if (function != ACPI_READ && function != ACPI_WRITE) | |
885 | return AE_BAD_PARAMETER; | |
886 | ||
887 | if (bits != 8) | |
888 | return AE_BAD_PARAMETER; | |
889 | ||
890 | if (function == ACPI_READ) { | |
891 | result = ec_read(address, &temp); | |
439913ff | 892 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
893 | } else { |
894 | temp = 0xff & ((*value) >> i); | |
895 | result = ec_write(address, temp); | |
896 | } | |
897 | ||
898 | switch (result) { | |
899 | case -EINVAL: | |
900 | return AE_BAD_PARAMETER; | |
901 | break; | |
902 | case -ENODEV: | |
903 | return AE_NOT_FOUND; | |
904 | break; | |
905 | case -ETIME: | |
906 | return AE_TIME; | |
907 | break; | |
908 | default: | |
909 | return AE_OK; | |
910 | } | |
911 | } | |
912 | ||
f61bb939 | 913 | static void acpi_wmi_notify(struct acpi_device *device, u32 event) |
bff431e4 CC |
914 | { |
915 | struct guid_block *block; | |
916 | struct wmi_block *wblock; | |
917 | struct list_head *p; | |
7715348c | 918 | char guid_string[37]; |
bff431e4 CC |
919 | |
920 | list_for_each(p, &wmi_blocks.list) { | |
921 | wblock = list_entry(p, struct wmi_block, list); | |
922 | block = &wblock->gblock; | |
923 | ||
924 | if ((block->flags & ACPI_WMI_EVENT) && | |
925 | (block->notify_id == event)) { | |
926 | if (wblock->handler) | |
927 | wblock->handler(event, wblock->handler_data); | |
7715348c TR |
928 | if (debug_event) { |
929 | wmi_gtoa(wblock->gblock.guid, guid_string); | |
930 | printk(KERN_INFO PREFIX "DEBUG Event GUID:" | |
931 | " %s\n", guid_string); | |
932 | } | |
bff431e4 CC |
933 | |
934 | acpi_bus_generate_netlink_event( | |
0794469d | 935 | device->pnp.device_class, dev_name(&device->dev), |
bff431e4 CC |
936 | event, 0); |
937 | break; | |
938 | } | |
939 | } | |
940 | } | |
941 | ||
942 | static int acpi_wmi_remove(struct acpi_device *device, int type) | |
943 | { | |
bff431e4 CC |
944 | acpi_remove_address_space_handler(device->handle, |
945 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
925b1089 | 950 | static int acpi_wmi_add(struct acpi_device *device) |
bff431e4 CC |
951 | { |
952 | acpi_status status; | |
953 | int result = 0; | |
954 | ||
bff431e4 CC |
955 | status = acpi_install_address_space_handler(device->handle, |
956 | ACPI_ADR_SPACE_EC, | |
957 | &acpi_wmi_ec_space_handler, | |
958 | NULL, NULL); | |
5212cd67 DT |
959 | if (ACPI_FAILURE(status)) { |
960 | printk(KERN_ERR PREFIX "Error installing EC region handler\n"); | |
bff431e4 | 961 | return -ENODEV; |
5212cd67 | 962 | } |
bff431e4 CC |
963 | |
964 | status = parse_wdg(device->handle); | |
965 | if (ACPI_FAILURE(status)) { | |
5212cd67 DT |
966 | acpi_remove_address_space_handler(device->handle, |
967 | ACPI_ADR_SPACE_EC, | |
968 | &acpi_wmi_ec_space_handler); | |
969 | printk(KERN_ERR PREFIX "Failed to parse WDG method\n"); | |
bff431e4 CC |
970 | return -ENODEV; |
971 | } | |
972 | ||
973 | return result; | |
974 | } | |
975 | ||
976 | static int __init acpi_wmi_init(void) | |
977 | { | |
da511997 | 978 | int result; |
bff431e4 | 979 | |
96b5a46e LT |
980 | INIT_LIST_HEAD(&wmi_blocks.list); |
981 | ||
bff431e4 CC |
982 | if (acpi_disabled) |
983 | return -ENODEV; | |
984 | ||
bff431e4 CC |
985 | result = acpi_bus_register_driver(&acpi_wmi_driver); |
986 | ||
987 | if (result < 0) { | |
988 | printk(KERN_INFO PREFIX "Error loading mapper\n"); | |
1caab3c1 MG |
989 | return -ENODEV; |
990 | } | |
991 | ||
992 | result = wmi_class_init(); | |
993 | if (result) { | |
994 | acpi_bus_unregister_driver(&acpi_wmi_driver); | |
995 | return result; | |
bff431e4 CC |
996 | } |
997 | ||
1caab3c1 MG |
998 | printk(KERN_INFO PREFIX "Mapper loaded\n"); |
999 | ||
bff431e4 CC |
1000 | return result; |
1001 | } | |
1002 | ||
1003 | static void __exit acpi_wmi_exit(void) | |
1004 | { | |
1005 | struct list_head *p, *tmp; | |
1006 | struct wmi_block *wblock; | |
1007 | ||
1caab3c1 MG |
1008 | wmi_class_exit(); |
1009 | ||
bff431e4 CC |
1010 | acpi_bus_unregister_driver(&acpi_wmi_driver); |
1011 | ||
1012 | list_for_each_safe(p, tmp, &wmi_blocks.list) { | |
1013 | wblock = list_entry(p, struct wmi_block, list); | |
1014 | ||
1015 | list_del(p); | |
1016 | kfree(wblock); | |
1017 | } | |
1018 | ||
1019 | printk(KERN_INFO PREFIX "Mapper unloaded\n"); | |
1020 | } | |
1021 | ||
1022 | subsys_initcall(acpi_wmi_init); | |
1023 | module_exit(acpi_wmi_exit); |