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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 | * | |
2c9c5664 DHV |
11 | * WMI bus infrastructure by Andrew Lutomirski and Darren Hart: |
12 | * Copyright (C) 2015 Andrew Lutomirski | |
13 | * Copyright (C) 2017 VMware, Inc. All Rights Reserved. | |
14 | * | |
bff431e4 CC |
15 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or (at | |
20 | * your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, but | |
23 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | * General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License along | |
28 | * with this program; if not, write to the Free Software Foundation, Inc., | |
29 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
30 | * | |
31 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
32 | */ | |
33 | ||
8e07514d DT |
34 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
35 | ||
b60ee4e0 | 36 | #include <linux/acpi.h> |
1caab3c1 | 37 | #include <linux/device.h> |
b60ee4e0 ML |
38 | #include <linux/init.h> |
39 | #include <linux/kernel.h> | |
bff431e4 | 40 | #include <linux/list.h> |
44b6b766 | 41 | #include <linux/miscdevice.h> |
7c52d551 | 42 | #include <linux/module.h> |
9599ed91 | 43 | #include <linux/platform_device.h> |
b60ee4e0 ML |
44 | #include <linux/slab.h> |
45 | #include <linux/types.h> | |
44b6b766 | 46 | #include <linux/uaccess.h> |
538d7eb8 | 47 | #include <linux/uuid.h> |
b60ee4e0 | 48 | #include <linux/wmi.h> |
44b6b766 | 49 | #include <uapi/linux/wmi.h> |
bff431e4 CC |
50 | |
51 | ACPI_MODULE_NAME("wmi"); | |
52 | MODULE_AUTHOR("Carlos Corbacho"); | |
53 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
762e1a2f | 56 | static LIST_HEAD(wmi_block_list); |
bff431e4 CC |
57 | |
58 | struct guid_block { | |
59 | char guid[16]; | |
60 | union { | |
61 | char object_id[2]; | |
62 | struct { | |
63 | unsigned char notify_id; | |
64 | unsigned char reserved; | |
65 | }; | |
66 | }; | |
67 | u8 instance_count; | |
68 | u8 flags; | |
69 | }; | |
70 | ||
71 | struct wmi_block { | |
844af950 | 72 | struct wmi_device dev; |
bff431e4 CC |
73 | struct list_head list; |
74 | struct guid_block gblock; | |
44b6b766 ML |
75 | struct miscdevice char_dev; |
76 | struct mutex char_mutex; | |
b0e86302 | 77 | struct acpi_device *acpi_device; |
bff431e4 CC |
78 | wmi_notify_handler handler; |
79 | void *handler_data; | |
44b6b766 | 80 | u64 req_buf_size; |
d4fc91ad | 81 | |
fd70da6a | 82 | bool read_takes_no_args; |
bff431e4 CC |
83 | }; |
84 | ||
bff431e4 CC |
85 | |
86 | /* | |
87 | * If the GUID data block is marked as expensive, we must enable and | |
88 | * explicitily disable data collection. | |
89 | */ | |
90 | #define ACPI_WMI_EXPENSIVE 0x1 | |
91 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
92 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
93 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
94 | ||
90ab5ee9 | 95 | static bool debug_event; |
fc3155b2 TR |
96 | module_param(debug_event, bool, 0444); |
97 | MODULE_PARM_DESC(debug_event, | |
98 | "Log WMI Events [0/1]"); | |
99 | ||
90ab5ee9 | 100 | static bool debug_dump_wdg; |
a929aae0 TR |
101 | module_param(debug_dump_wdg, bool, 0444); |
102 | MODULE_PARM_DESC(debug_dump_wdg, | |
103 | "Dump available WMI interfaces [0/1]"); | |
104 | ||
9599ed91 AL |
105 | static int acpi_wmi_remove(struct platform_device *device); |
106 | static int acpi_wmi_probe(struct platform_device *device); | |
bff431e4 CC |
107 | |
108 | static const struct acpi_device_id wmi_device_ids[] = { | |
109 | {"PNP0C14", 0}, | |
110 | {"pnp0c14", 0}, | |
111 | {"", 0}, | |
112 | }; | |
113 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
114 | ||
9599ed91 AL |
115 | static struct platform_driver acpi_wmi_driver = { |
116 | .driver = { | |
117 | .name = "acpi-wmi", | |
118 | .acpi_match_table = wmi_device_ids, | |
c64eefd4 | 119 | }, |
9599ed91 AL |
120 | .probe = acpi_wmi_probe, |
121 | .remove = acpi_wmi_remove, | |
bff431e4 CC |
122 | }; |
123 | ||
124 | /* | |
125 | * GUID parsing functions | |
126 | */ | |
127 | ||
bff431e4 CC |
128 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
129 | { | |
538d7eb8 | 130 | uuid_le guid_input; |
bff431e4 CC |
131 | struct wmi_block *wblock; |
132 | struct guid_block *block; | |
bff431e4 | 133 | |
538d7eb8 AS |
134 | if (uuid_le_to_bin(guid_string, &guid_input)) |
135 | return false; | |
bff431e4 | 136 | |
cedb3b2a | 137 | list_for_each_entry(wblock, &wmi_block_list, list) { |
bff431e4 CC |
138 | block = &wblock->gblock; |
139 | ||
538d7eb8 | 140 | if (memcmp(block->guid, &guid_input, 16) == 0) { |
bff431e4 CC |
141 | if (out) |
142 | *out = wblock; | |
097c27fc | 143 | return true; |
bff431e4 CC |
144 | } |
145 | } | |
097c27fc | 146 | return false; |
bff431e4 CC |
147 | } |
148 | ||
d4fc91ad AL |
149 | static int get_subobj_info(acpi_handle handle, const char *pathname, |
150 | struct acpi_device_info **info) | |
151 | { | |
152 | struct acpi_device_info *dummy_info, **info_ptr; | |
153 | acpi_handle subobj_handle; | |
154 | acpi_status status; | |
155 | ||
156 | status = acpi_get_handle(handle, (char *)pathname, &subobj_handle); | |
157 | if (status == AE_NOT_FOUND) | |
158 | return -ENOENT; | |
159 | else if (ACPI_FAILURE(status)) | |
160 | return -EIO; | |
161 | ||
162 | info_ptr = info ? info : &dummy_info; | |
163 | status = acpi_get_object_info(subobj_handle, info_ptr); | |
164 | if (ACPI_FAILURE(status)) | |
165 | return -EIO; | |
166 | ||
167 | if (!info) | |
168 | kfree(dummy_info); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
a66bfa7a MG |
173 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
174 | { | |
175 | struct guid_block *block = NULL; | |
176 | char method[5]; | |
a66bfa7a MG |
177 | acpi_status status; |
178 | acpi_handle handle; | |
179 | ||
180 | block = &wblock->gblock; | |
b0e86302 | 181 | handle = wblock->acpi_device->handle; |
a66bfa7a | 182 | |
a66bfa7a | 183 | snprintf(method, 5, "WE%02X", block->notify_id); |
8122ab66 | 184 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
185 | |
186 | if (status != AE_OK && status != AE_NOT_FOUND) | |
187 | return status; | |
188 | else | |
189 | return AE_OK; | |
190 | } | |
191 | ||
bff431e4 CC |
192 | /* |
193 | * Exported WMI functions | |
194 | */ | |
44b6b766 ML |
195 | |
196 | /** | |
197 | * set_required_buffer_size - Sets the buffer size needed for performing IOCTL | |
198 | * @wdev: A wmi bus device from a driver | |
199 | * @instance: Instance index | |
200 | * | |
201 | * Allocates memory needed for buffer, stores the buffer size in that memory | |
202 | */ | |
203 | int set_required_buffer_size(struct wmi_device *wdev, u64 length) | |
204 | { | |
205 | struct wmi_block *wblock; | |
206 | ||
207 | wblock = container_of(wdev, struct wmi_block, dev); | |
208 | wblock->req_buf_size = length; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(set_required_buffer_size); | |
213 | ||
bff431e4 CC |
214 | /** |
215 | * wmi_evaluate_method - Evaluate a WMI method | |
216 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
217 | * @instance: Instance index | |
218 | * @method_id: Method ID to call | |
219 | * &in: Buffer containing input for the method call | |
220 | * &out: Empty buffer to return the method results | |
221 | * | |
222 | * Call an ACPI-WMI method | |
223 | */ | |
224 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
225 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
722c856d ML |
226 | { |
227 | struct wmi_block *wblock = NULL; | |
228 | ||
229 | if (!find_guid(guid_string, &wblock)) | |
230 | return AE_ERROR; | |
231 | return wmidev_evaluate_method(&wblock->dev, instance, method_id, | |
232 | in, out); | |
233 | } | |
234 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
235 | ||
236 | /** | |
237 | * wmidev_evaluate_method - Evaluate a WMI method | |
238 | * @wdev: A wmi bus device from a driver | |
239 | * @instance: Instance index | |
240 | * @method_id: Method ID to call | |
241 | * &in: Buffer containing input for the method call | |
242 | * &out: Empty buffer to return the method results | |
243 | * | |
244 | * Call an ACPI-WMI method | |
245 | */ | |
246 | acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance, | |
247 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
bff431e4 CC |
248 | { |
249 | struct guid_block *block = NULL; | |
250 | struct wmi_block *wblock = NULL; | |
251 | acpi_handle handle; | |
252 | acpi_status status; | |
253 | struct acpi_object_list input; | |
254 | union acpi_object params[3]; | |
f3d83e24 | 255 | char method[5] = "WM"; |
bff431e4 | 256 | |
722c856d | 257 | wblock = container_of(wdev, struct wmi_block, dev); |
bff431e4 | 258 | block = &wblock->gblock; |
b0e86302 | 259 | handle = wblock->acpi_device->handle; |
bff431e4 | 260 | |
e6bafba5 | 261 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
262 | return AE_BAD_DATA; |
263 | ||
6afa1e2a | 264 | if (block->instance_count <= instance) |
bff431e4 CC |
265 | return AE_BAD_PARAMETER; |
266 | ||
267 | input.count = 2; | |
268 | input.pointer = params; | |
269 | params[0].type = ACPI_TYPE_INTEGER; | |
270 | params[0].integer.value = instance; | |
271 | params[1].type = ACPI_TYPE_INTEGER; | |
272 | params[1].integer.value = method_id; | |
273 | ||
274 | if (in) { | |
275 | input.count = 3; | |
276 | ||
277 | if (block->flags & ACPI_WMI_STRING) { | |
278 | params[2].type = ACPI_TYPE_STRING; | |
279 | } else { | |
280 | params[2].type = ACPI_TYPE_BUFFER; | |
281 | } | |
282 | params[2].buffer.length = in->length; | |
283 | params[2].buffer.pointer = in->pointer; | |
284 | } | |
285 | ||
286 | strncat(method, block->object_id, 2); | |
287 | ||
288 | status = acpi_evaluate_object(handle, method, &input, out); | |
289 | ||
290 | return status; | |
291 | } | |
722c856d | 292 | EXPORT_SYMBOL_GPL(wmidev_evaluate_method); |
bff431e4 | 293 | |
56a37025 AL |
294 | static acpi_status __query_block(struct wmi_block *wblock, u8 instance, |
295 | struct acpi_buffer *out) | |
bff431e4 CC |
296 | { |
297 | struct guid_block *block = NULL; | |
54f14c27 | 298 | acpi_handle handle; |
bff431e4 | 299 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
300 | struct acpi_object_list input; |
301 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
302 | char method[5]; |
303 | char wc_method[5] = "WC"; | |
bff431e4 | 304 | |
56a37025 | 305 | if (!out) |
bff431e4 CC |
306 | return AE_BAD_PARAMETER; |
307 | ||
bff431e4 | 308 | block = &wblock->gblock; |
b0e86302 | 309 | handle = wblock->acpi_device->handle; |
bff431e4 | 310 | |
6afa1e2a | 311 | if (block->instance_count <= instance) |
bff431e4 CC |
312 | return AE_BAD_PARAMETER; |
313 | ||
314 | /* Check GUID is a data block */ | |
315 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 316 | return AE_ERROR; |
bff431e4 CC |
317 | |
318 | input.count = 1; | |
319 | input.pointer = wq_params; | |
320 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
321 | wq_params[0].integer.value = instance; | |
322 | ||
d4fc91ad AL |
323 | if (instance == 0 && wblock->read_takes_no_args) |
324 | input.count = 0; | |
325 | ||
bff431e4 CC |
326 | /* |
327 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
328 | * enable collection. | |
329 | */ | |
330 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
331 | strncat(wc_method, block->object_id, 2); |
332 | ||
333 | /* | |
334 | * Some GUIDs break the specification by declaring themselves | |
335 | * expensive, but have no corresponding WCxx method. So we | |
336 | * should not fail if this happens. | |
337 | */ | |
54f14c27 | 338 | if (acpi_has_method(handle, wc_method)) |
8122ab66 ZR |
339 | wc_status = acpi_execute_simple_method(handle, |
340 | wc_method, 1); | |
bff431e4 CC |
341 | } |
342 | ||
343 | strcpy(method, "WQ"); | |
344 | strncat(method, block->object_id, 2); | |
345 | ||
dab36ad8 | 346 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
347 | |
348 | /* | |
349 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
350 | * the WQxx method failed - we should disable collection anyway. | |
351 | */ | |
a527f2d7 | 352 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8122ab66 | 353 | status = acpi_execute_simple_method(handle, wc_method, 0); |
bff431e4 CC |
354 | } |
355 | ||
356 | return status; | |
357 | } | |
56a37025 AL |
358 | |
359 | /** | |
360 | * wmi_query_block - Return contents of a WMI block (deprecated) | |
361 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
362 | * @instance: Instance index | |
363 | * &out: Empty buffer to return the contents of the data block to | |
364 | * | |
365 | * Return the contents of an ACPI-WMI data block to a buffer | |
366 | */ | |
367 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
368 | struct acpi_buffer *out) | |
369 | { | |
370 | struct wmi_block *wblock; | |
371 | ||
372 | if (!guid_string) | |
373 | return AE_BAD_PARAMETER; | |
374 | ||
375 | if (!find_guid(guid_string, &wblock)) | |
376 | return AE_ERROR; | |
377 | ||
378 | return __query_block(wblock, instance, out); | |
379 | } | |
bff431e4 CC |
380 | EXPORT_SYMBOL_GPL(wmi_query_block); |
381 | ||
56a37025 AL |
382 | union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance) |
383 | { | |
384 | struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; | |
385 | struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev); | |
386 | ||
387 | if (ACPI_FAILURE(__query_block(wblock, instance, &out))) | |
388 | return NULL; | |
389 | ||
390 | return (union acpi_object *)out.pointer; | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(wmidev_block_query); | |
393 | ||
bff431e4 CC |
394 | /** |
395 | * wmi_set_block - Write to a WMI block | |
396 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
397 | * @instance: Instance index | |
398 | * &in: Buffer containing new values for the data block | |
399 | * | |
400 | * Write the contents of the input buffer to an ACPI-WMI data block | |
401 | */ | |
402 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
56a37025 | 403 | const struct acpi_buffer *in) |
bff431e4 CC |
404 | { |
405 | struct guid_block *block = NULL; | |
406 | struct wmi_block *wblock = NULL; | |
407 | acpi_handle handle; | |
408 | struct acpi_object_list input; | |
409 | union acpi_object params[2]; | |
f3d83e24 | 410 | char method[5] = "WS"; |
bff431e4 CC |
411 | |
412 | if (!guid_string || !in) | |
413 | return AE_BAD_DATA; | |
414 | ||
415 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 416 | return AE_ERROR; |
bff431e4 CC |
417 | |
418 | block = &wblock->gblock; | |
b0e86302 | 419 | handle = wblock->acpi_device->handle; |
bff431e4 | 420 | |
6afa1e2a | 421 | if (block->instance_count <= instance) |
bff431e4 CC |
422 | return AE_BAD_PARAMETER; |
423 | ||
424 | /* Check GUID is a data block */ | |
425 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 426 | return AE_ERROR; |
bff431e4 CC |
427 | |
428 | input.count = 2; | |
429 | input.pointer = params; | |
430 | params[0].type = ACPI_TYPE_INTEGER; | |
431 | params[0].integer.value = instance; | |
432 | ||
433 | if (block->flags & ACPI_WMI_STRING) { | |
434 | params[1].type = ACPI_TYPE_STRING; | |
435 | } else { | |
436 | params[1].type = ACPI_TYPE_BUFFER; | |
437 | } | |
438 | params[1].buffer.length = in->length; | |
439 | params[1].buffer.pointer = in->pointer; | |
440 | ||
441 | strncat(method, block->object_id, 2); | |
442 | ||
443 | return acpi_evaluate_object(handle, method, &input, NULL); | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
446 | ||
37830662 | 447 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 | 448 | { |
85b4e4eb | 449 | pr_info("%pUL:\n", g->guid); |
cd3921f8 PR |
450 | if (g->flags & ACPI_WMI_EVENT) |
451 | pr_info("\tnotify_id: 0x%02X\n", g->notify_id); | |
452 | else | |
453 | pr_info("\tobject_id: %2pE\n", g->object_id); | |
8e07514d | 454 | pr_info("\tinstance_count: %d\n", g->instance_count); |
dd8e908e | 455 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 456 | if (g->flags) { |
a929aae0 | 457 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 458 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 459 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 460 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 461 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 462 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 463 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 464 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 465 | } |
8e07514d | 466 | pr_cont("\n"); |
a929aae0 TR |
467 | |
468 | } | |
469 | ||
fc3155b2 TR |
470 | static void wmi_notify_debug(u32 value, void *context) |
471 | { | |
472 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
473 | union acpi_object *obj; | |
1492616a | 474 | acpi_status status; |
fc3155b2 | 475 | |
1492616a AL |
476 | status = wmi_get_event_data(value, &response); |
477 | if (status != AE_OK) { | |
8e07514d | 478 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
479 | return; |
480 | } | |
fc3155b2 TR |
481 | |
482 | obj = (union acpi_object *)response.pointer; | |
483 | ||
484 | if (!obj) | |
485 | return; | |
486 | ||
8e07514d | 487 | pr_info("DEBUG Event "); |
fc3155b2 TR |
488 | switch(obj->type) { |
489 | case ACPI_TYPE_BUFFER: | |
8e07514d | 490 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
491 | break; |
492 | case ACPI_TYPE_STRING: | |
8e07514d | 493 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
494 | break; |
495 | case ACPI_TYPE_INTEGER: | |
8e07514d | 496 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
497 | break; |
498 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 499 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
500 | break; |
501 | default: | |
8e07514d | 502 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 503 | } |
1492616a | 504 | kfree(obj); |
fc3155b2 TR |
505 | } |
506 | ||
bff431e4 CC |
507 | /** |
508 | * wmi_install_notify_handler - Register handler for WMI events | |
509 | * @handler: Function to handle notifications | |
510 | * @data: Data to be returned to handler when event is fired | |
511 | * | |
512 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
513 | */ | |
514 | acpi_status wmi_install_notify_handler(const char *guid, | |
515 | wmi_notify_handler handler, void *data) | |
516 | { | |
517 | struct wmi_block *block; | |
58f6425e | 518 | acpi_status status = AE_NOT_EXIST; |
538d7eb8 | 519 | uuid_le guid_input; |
bff431e4 CC |
520 | |
521 | if (!guid || !handler) | |
522 | return AE_BAD_PARAMETER; | |
523 | ||
538d7eb8 AS |
524 | if (uuid_le_to_bin(guid, &guid_input)) |
525 | return AE_BAD_PARAMETER; | |
bff431e4 | 526 | |
cedb3b2a | 527 | list_for_each_entry(block, &wmi_block_list, list) { |
58f6425e | 528 | acpi_status wmi_status; |
58f6425e | 529 | |
538d7eb8 | 530 | if (memcmp(block->gblock.guid, &guid_input, 16) == 0) { |
58f6425e CK |
531 | if (block->handler && |
532 | block->handler != wmi_notify_debug) | |
533 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 534 | |
58f6425e CK |
535 | block->handler = handler; |
536 | block->handler_data = data; | |
bff431e4 | 537 | |
58f6425e CK |
538 | wmi_status = wmi_method_enable(block, 1); |
539 | if ((wmi_status != AE_OK) || | |
540 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
541 | status = wmi_status; | |
542 | } | |
543 | } | |
a66bfa7a MG |
544 | |
545 | return status; | |
bff431e4 CC |
546 | } |
547 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
548 | ||
549 | /** | |
550 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
551 | * | |
552 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
553 | */ | |
554 | acpi_status wmi_remove_notify_handler(const char *guid) | |
555 | { | |
556 | struct wmi_block *block; | |
58f6425e | 557 | acpi_status status = AE_NOT_EXIST; |
538d7eb8 | 558 | uuid_le guid_input; |
bff431e4 CC |
559 | |
560 | if (!guid) | |
561 | return AE_BAD_PARAMETER; | |
562 | ||
538d7eb8 AS |
563 | if (uuid_le_to_bin(guid, &guid_input)) |
564 | return AE_BAD_PARAMETER; | |
bff431e4 | 565 | |
cedb3b2a | 566 | list_for_each_entry(block, &wmi_block_list, list) { |
58f6425e | 567 | acpi_status wmi_status; |
58f6425e | 568 | |
538d7eb8 | 569 | if (memcmp(block->gblock.guid, &guid_input, 16) == 0) { |
58f6425e CK |
570 | if (!block->handler || |
571 | block->handler == wmi_notify_debug) | |
572 | return AE_NULL_ENTRY; | |
573 | ||
574 | if (debug_event) { | |
575 | block->handler = wmi_notify_debug; | |
576 | status = AE_OK; | |
577 | } else { | |
578 | wmi_status = wmi_method_enable(block, 0); | |
579 | block->handler = NULL; | |
580 | block->handler_data = NULL; | |
581 | if ((wmi_status != AE_OK) || | |
582 | ((wmi_status == AE_OK) && | |
583 | (status == AE_NOT_EXIST))) | |
584 | status = wmi_status; | |
585 | } | |
586 | } | |
fc3155b2 | 587 | } |
58f6425e | 588 | |
a66bfa7a | 589 | return status; |
bff431e4 CC |
590 | } |
591 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
592 | ||
593 | /** | |
594 | * wmi_get_event_data - Get WMI data associated with an event | |
595 | * | |
3e9b988e AA |
596 | * @event: Event to find |
597 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
598 | * |
599 | * Returns extra data associated with an event in WMI. | |
600 | */ | |
601 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
602 | { | |
603 | struct acpi_object_list input; | |
604 | union acpi_object params[1]; | |
605 | struct guid_block *gblock; | |
606 | struct wmi_block *wblock; | |
bff431e4 CC |
607 | |
608 | input.count = 1; | |
609 | input.pointer = params; | |
610 | params[0].type = ACPI_TYPE_INTEGER; | |
611 | params[0].integer.value = event; | |
612 | ||
cedb3b2a | 613 | list_for_each_entry(wblock, &wmi_block_list, list) { |
bff431e4 CC |
614 | gblock = &wblock->gblock; |
615 | ||
616 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
617 | (gblock->notify_id == event)) | |
b0e86302 AL |
618 | return acpi_evaluate_object(wblock->acpi_device->handle, |
619 | "_WED", &input, out); | |
bff431e4 CC |
620 | } |
621 | ||
622 | return AE_NOT_FOUND; | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(wmi_get_event_data); | |
625 | ||
626 | /** | |
627 | * wmi_has_guid - Check if a GUID is available | |
628 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
629 | * | |
630 | * Check if a given GUID is defined by _WDG | |
631 | */ | |
632 | bool wmi_has_guid(const char *guid_string) | |
633 | { | |
634 | return find_guid(guid_string, NULL); | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(wmi_has_guid); | |
637 | ||
844af950 AL |
638 | static struct wmi_block *dev_to_wblock(struct device *dev) |
639 | { | |
640 | return container_of(dev, struct wmi_block, dev.dev); | |
641 | } | |
642 | ||
643 | static struct wmi_device *dev_to_wdev(struct device *dev) | |
644 | { | |
645 | return container_of(dev, struct wmi_device, dev); | |
646 | } | |
647 | ||
1caab3c1 MG |
648 | /* |
649 | * sysfs interface | |
650 | */ | |
614ef432 | 651 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
652 | char *buf) |
653 | { | |
844af950 | 654 | struct wmi_block *wblock = dev_to_wblock(dev); |
1caab3c1 | 655 | |
85b4e4eb | 656 | return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid); |
1caab3c1 | 657 | } |
e80b89a5 | 658 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 659 | |
844af950 AL |
660 | static ssize_t guid_show(struct device *dev, struct device_attribute *attr, |
661 | char *buf) | |
662 | { | |
663 | struct wmi_block *wblock = dev_to_wblock(dev); | |
664 | ||
665 | return sprintf(buf, "%pUL\n", wblock->gblock.guid); | |
666 | } | |
667 | static DEVICE_ATTR_RO(guid); | |
668 | ||
d79b1074 AL |
669 | static ssize_t instance_count_show(struct device *dev, |
670 | struct device_attribute *attr, char *buf) | |
671 | { | |
672 | struct wmi_block *wblock = dev_to_wblock(dev); | |
673 | ||
674 | return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count); | |
675 | } | |
676 | static DEVICE_ATTR_RO(instance_count); | |
677 | ||
678 | static ssize_t expensive_show(struct device *dev, | |
679 | struct device_attribute *attr, char *buf) | |
680 | { | |
681 | struct wmi_block *wblock = dev_to_wblock(dev); | |
682 | ||
683 | return sprintf(buf, "%d\n", | |
684 | (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0); | |
685 | } | |
686 | static DEVICE_ATTR_RO(expensive); | |
687 | ||
e80b89a5 GKH |
688 | static struct attribute *wmi_attrs[] = { |
689 | &dev_attr_modalias.attr, | |
844af950 | 690 | &dev_attr_guid.attr, |
d79b1074 AL |
691 | &dev_attr_instance_count.attr, |
692 | &dev_attr_expensive.attr, | |
e80b89a5 | 693 | NULL, |
614ef432 | 694 | }; |
e80b89a5 | 695 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 | 696 | |
d79b1074 AL |
697 | static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr, |
698 | char *buf) | |
699 | { | |
700 | struct wmi_block *wblock = dev_to_wblock(dev); | |
701 | ||
702 | return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id); | |
703 | } | |
704 | static DEVICE_ATTR_RO(notify_id); | |
705 | ||
706 | static struct attribute *wmi_event_attrs[] = { | |
707 | &dev_attr_notify_id.attr, | |
708 | NULL, | |
709 | }; | |
710 | ATTRIBUTE_GROUPS(wmi_event); | |
711 | ||
712 | static ssize_t object_id_show(struct device *dev, struct device_attribute *attr, | |
713 | char *buf) | |
714 | { | |
715 | struct wmi_block *wblock = dev_to_wblock(dev); | |
716 | ||
717 | return sprintf(buf, "%c%c\n", wblock->gblock.object_id[0], | |
718 | wblock->gblock.object_id[1]); | |
719 | } | |
720 | static DEVICE_ATTR_RO(object_id); | |
721 | ||
fd70da6a DHV |
722 | static ssize_t setable_show(struct device *dev, struct device_attribute *attr, |
723 | char *buf) | |
d4fc91ad AL |
724 | { |
725 | struct wmi_device *wdev = dev_to_wdev(dev); | |
726 | ||
fd70da6a | 727 | return sprintf(buf, "%d\n", (int)wdev->setable); |
d4fc91ad | 728 | } |
fd70da6a | 729 | static DEVICE_ATTR_RO(setable); |
d4fc91ad AL |
730 | |
731 | static struct attribute *wmi_data_attrs[] = { | |
732 | &dev_attr_object_id.attr, | |
fd70da6a | 733 | &dev_attr_setable.attr, |
d4fc91ad AL |
734 | NULL, |
735 | }; | |
736 | ATTRIBUTE_GROUPS(wmi_data); | |
737 | ||
738 | static struct attribute *wmi_method_attrs[] = { | |
d79b1074 AL |
739 | &dev_attr_object_id.attr, |
740 | NULL, | |
741 | }; | |
d4fc91ad | 742 | ATTRIBUTE_GROUPS(wmi_method); |
d79b1074 | 743 | |
1caab3c1 MG |
744 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
745 | { | |
844af950 | 746 | struct wmi_block *wblock = dev_to_wblock(dev); |
1caab3c1 | 747 | |
844af950 | 748 | if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid)) |
1caab3c1 MG |
749 | return -ENOMEM; |
750 | ||
844af950 | 751 | if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid)) |
1caab3c1 MG |
752 | return -ENOMEM; |
753 | ||
844af950 AL |
754 | return 0; |
755 | } | |
756 | ||
757 | static void wmi_dev_release(struct device *dev) | |
758 | { | |
759 | struct wmi_block *wblock = dev_to_wblock(dev); | |
760 | ||
761 | kfree(wblock); | |
762 | } | |
763 | ||
764 | static int wmi_dev_match(struct device *dev, struct device_driver *driver) | |
765 | { | |
766 | struct wmi_driver *wmi_driver = | |
767 | container_of(driver, struct wmi_driver, driver); | |
768 | struct wmi_block *wblock = dev_to_wblock(dev); | |
769 | const struct wmi_device_id *id = wmi_driver->id_table; | |
1caab3c1 | 770 | |
844af950 AL |
771 | while (id->guid_string) { |
772 | uuid_le driver_guid; | |
773 | ||
774 | if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid))) | |
775 | continue; | |
776 | if (!memcmp(&driver_guid, wblock->gblock.guid, 16)) | |
777 | return 1; | |
778 | ||
779 | id++; | |
780 | } | |
1caab3c1 MG |
781 | |
782 | return 0; | |
783 | } | |
44b6b766 ML |
784 | static int wmi_char_open(struct inode *inode, struct file *filp) |
785 | { | |
786 | const char *driver_name = filp->f_path.dentry->d_iname; | |
787 | struct wmi_block *wblock = NULL; | |
788 | struct wmi_block *next = NULL; | |
789 | ||
790 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { | |
791 | if (!wblock->dev.dev.driver) | |
792 | continue; | |
793 | if (strcmp(driver_name, wblock->dev.dev.driver->name) == 0) { | |
794 | filp->private_data = wblock; | |
795 | break; | |
796 | } | |
797 | } | |
798 | ||
799 | if (!filp->private_data) | |
800 | return -ENODEV; | |
801 | ||
802 | return nonseekable_open(inode, filp); | |
803 | } | |
804 | ||
805 | static ssize_t wmi_char_read(struct file *filp, char __user *buffer, | |
806 | size_t length, loff_t *offset) | |
807 | { | |
808 | struct wmi_block *wblock = filp->private_data; | |
809 | ||
810 | return simple_read_from_buffer(buffer, length, offset, | |
811 | &wblock->req_buf_size, | |
812 | sizeof(wblock->req_buf_size)); | |
813 | } | |
814 | ||
815 | static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
816 | { | |
817 | struct wmi_ioctl_buffer __user *input = | |
818 | (struct wmi_ioctl_buffer __user *) arg; | |
819 | struct wmi_block *wblock = filp->private_data; | |
820 | struct wmi_ioctl_buffer *buf = NULL; | |
821 | struct wmi_driver *wdriver = NULL; | |
822 | int ret; | |
823 | ||
824 | if (_IOC_TYPE(cmd) != WMI_IOC) | |
825 | return -ENOTTY; | |
826 | ||
827 | /* make sure we're not calling a higher instance than exists*/ | |
828 | if (_IOC_NR(cmd) >= wblock->gblock.instance_count) | |
829 | return -EINVAL; | |
830 | ||
831 | mutex_lock(&wblock->char_mutex); | |
832 | buf = wblock->handler_data; | |
833 | if (get_user(buf->length, &input->length)) { | |
834 | dev_dbg(&wblock->dev.dev, "Read length from user failed\n"); | |
835 | ret = -EFAULT; | |
836 | goto out_ioctl; | |
837 | } | |
838 | /* if it's too small, abort */ | |
839 | if (buf->length < wblock->req_buf_size) { | |
840 | dev_err(&wblock->dev.dev, | |
841 | "Buffer %lld too small, need at least %lld\n", | |
842 | buf->length, wblock->req_buf_size); | |
843 | ret = -EINVAL; | |
844 | goto out_ioctl; | |
845 | } | |
846 | /* if it's too big, warn, driver will only use what is needed */ | |
847 | if (buf->length > wblock->req_buf_size) | |
848 | dev_warn(&wblock->dev.dev, | |
849 | "Buffer %lld is bigger than required %lld\n", | |
850 | buf->length, wblock->req_buf_size); | |
851 | ||
852 | /* copy the structure from userspace */ | |
853 | if (copy_from_user(buf, input, wblock->req_buf_size)) { | |
854 | dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n", | |
855 | wblock->req_buf_size); | |
856 | ret = -EFAULT; | |
857 | goto out_ioctl; | |
858 | } | |
859 | ||
860 | /* let the driver do any filtering and do the call */ | |
861 | wdriver = container_of(wblock->dev.dev.driver, | |
862 | struct wmi_driver, driver); | |
5e3e2297 ML |
863 | if (!try_module_get(wdriver->driver.owner)) { |
864 | ret = -EBUSY; | |
865 | goto out_ioctl; | |
866 | } | |
44b6b766 ML |
867 | ret = wdriver->filter_callback(&wblock->dev, cmd, buf); |
868 | module_put(wdriver->driver.owner); | |
869 | if (ret) | |
870 | goto out_ioctl; | |
871 | ||
872 | /* return the result (only up to our internal buffer size) */ | |
873 | if (copy_to_user(input, buf, wblock->req_buf_size)) { | |
874 | dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n", | |
875 | wblock->req_buf_size); | |
876 | ret = -EFAULT; | |
877 | } | |
878 | ||
879 | out_ioctl: | |
880 | mutex_unlock(&wblock->char_mutex); | |
881 | return ret; | |
882 | } | |
883 | ||
884 | static const struct file_operations wmi_fops = { | |
885 | .owner = THIS_MODULE, | |
886 | .read = wmi_char_read, | |
887 | .open = wmi_char_open, | |
888 | .unlocked_ioctl = wmi_ioctl, | |
889 | .compat_ioctl = wmi_ioctl, | |
890 | }; | |
1caab3c1 | 891 | |
844af950 | 892 | static int wmi_dev_probe(struct device *dev) |
1caab3c1 | 893 | { |
844af950 AL |
894 | struct wmi_block *wblock = dev_to_wblock(dev); |
895 | struct wmi_driver *wdriver = | |
896 | container_of(dev->driver, struct wmi_driver, driver); | |
897 | int ret = 0; | |
44b6b766 ML |
898 | int count; |
899 | char *buf; | |
844af950 AL |
900 | |
901 | if (ACPI_FAILURE(wmi_method_enable(wblock, 1))) | |
902 | dev_warn(dev, "failed to enable device -- probing anyway\n"); | |
903 | ||
904 | if (wdriver->probe) { | |
905 | ret = wdriver->probe(dev_to_wdev(dev)); | |
44b6b766 ML |
906 | if (ret != 0) |
907 | goto probe_failure; | |
908 | } | |
909 | ||
910 | /* driver wants a character device made */ | |
911 | if (wdriver->filter_callback) { | |
912 | /* check that required buffer size declared by driver or MOF */ | |
913 | if (!wblock->req_buf_size) { | |
914 | dev_err(&wblock->dev.dev, | |
915 | "Required buffer size not set\n"); | |
916 | ret = -EINVAL; | |
917 | goto probe_failure; | |
918 | } | |
919 | ||
920 | count = get_order(wblock->req_buf_size); | |
921 | wblock->handler_data = (void *)__get_free_pages(GFP_KERNEL, | |
922 | count); | |
923 | if (!wblock->handler_data) { | |
924 | ret = -ENOMEM; | |
925 | goto probe_failure; | |
926 | } | |
927 | ||
7f166add | 928 | buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name); |
44b6b766 ML |
929 | if (!buf) { |
930 | ret = -ENOMEM; | |
931 | goto probe_string_failure; | |
932 | } | |
44b6b766 ML |
933 | wblock->char_dev.minor = MISC_DYNAMIC_MINOR; |
934 | wblock->char_dev.name = buf; | |
935 | wblock->char_dev.fops = &wmi_fops; | |
936 | wblock->char_dev.mode = 0444; | |
937 | ret = misc_register(&wblock->char_dev); | |
938 | if (ret) { | |
939 | dev_warn(dev, "failed to register char dev: %d", ret); | |
940 | ret = -ENOMEM; | |
941 | goto probe_misc_failure; | |
942 | } | |
844af950 AL |
943 | } |
944 | ||
44b6b766 ML |
945 | return 0; |
946 | ||
947 | probe_misc_failure: | |
948 | kfree(buf); | |
949 | probe_string_failure: | |
950 | kfree(wblock->handler_data); | |
951 | probe_failure: | |
952 | if (ACPI_FAILURE(wmi_method_enable(wblock, 0))) | |
953 | dev_warn(dev, "failed to disable device\n"); | |
844af950 AL |
954 | return ret; |
955 | } | |
956 | ||
957 | static int wmi_dev_remove(struct device *dev) | |
958 | { | |
959 | struct wmi_block *wblock = dev_to_wblock(dev); | |
960 | struct wmi_driver *wdriver = | |
961 | container_of(dev->driver, struct wmi_driver, driver); | |
962 | int ret = 0; | |
963 | ||
44b6b766 ML |
964 | if (wdriver->filter_callback) { |
965 | misc_deregister(&wblock->char_dev); | |
966 | kfree(wblock->char_dev.name); | |
967 | free_pages((unsigned long)wblock->handler_data, | |
968 | get_order(wblock->req_buf_size)); | |
969 | } | |
970 | ||
844af950 AL |
971 | if (wdriver->remove) |
972 | ret = wdriver->remove(dev_to_wdev(dev)); | |
973 | ||
974 | if (ACPI_FAILURE(wmi_method_enable(wblock, 0))) | |
975 | dev_warn(dev, "failed to disable device\n"); | |
c64eefd4 | 976 | |
844af950 | 977 | return ret; |
1caab3c1 MG |
978 | } |
979 | ||
844af950 AL |
980 | static struct class wmi_bus_class = { |
981 | .name = "wmi_bus", | |
982 | }; | |
983 | ||
984 | static struct bus_type wmi_bus_type = { | |
1caab3c1 | 985 | .name = "wmi", |
e80b89a5 | 986 | .dev_groups = wmi_groups, |
844af950 AL |
987 | .match = wmi_dev_match, |
988 | .uevent = wmi_dev_uevent, | |
989 | .probe = wmi_dev_probe, | |
990 | .remove = wmi_dev_remove, | |
1caab3c1 MG |
991 | }; |
992 | ||
d79b1074 AL |
993 | static struct device_type wmi_type_event = { |
994 | .name = "event", | |
995 | .groups = wmi_event_groups, | |
996 | .release = wmi_dev_release, | |
997 | }; | |
998 | ||
999 | static struct device_type wmi_type_method = { | |
1000 | .name = "method", | |
d4fc91ad | 1001 | .groups = wmi_method_groups, |
d79b1074 AL |
1002 | .release = wmi_dev_release, |
1003 | }; | |
1004 | ||
1005 | static struct device_type wmi_type_data = { | |
1006 | .name = "data", | |
d4fc91ad | 1007 | .groups = wmi_data_groups, |
d79b1074 AL |
1008 | .release = wmi_dev_release, |
1009 | }; | |
1010 | ||
fd70da6a | 1011 | static int wmi_create_device(struct device *wmi_bus_dev, |
844af950 | 1012 | const struct guid_block *gblock, |
7f5809bf AL |
1013 | struct wmi_block *wblock, |
1014 | struct acpi_device *device) | |
1caab3c1 | 1015 | { |
fd70da6a DHV |
1016 | struct acpi_device_info *info; |
1017 | char method[5]; | |
1018 | int result; | |
1caab3c1 | 1019 | |
d79b1074 AL |
1020 | if (gblock->flags & ACPI_WMI_EVENT) { |
1021 | wblock->dev.dev.type = &wmi_type_event; | |
fd70da6a DHV |
1022 | goto out_init; |
1023 | } | |
1024 | ||
1025 | if (gblock->flags & ACPI_WMI_METHOD) { | |
d79b1074 | 1026 | wblock->dev.dev.type = &wmi_type_method; |
44b6b766 | 1027 | mutex_init(&wblock->char_mutex); |
fd70da6a DHV |
1028 | goto out_init; |
1029 | } | |
d4fc91ad | 1030 | |
fd70da6a DHV |
1031 | /* |
1032 | * Data Block Query Control Method (WQxx by convention) is | |
1033 | * required per the WMI documentation. If it is not present, | |
1034 | * we ignore this data block. | |
1035 | */ | |
1036 | strcpy(method, "WQ"); | |
1037 | strncat(method, wblock->gblock.object_id, 2); | |
1038 | result = get_subobj_info(device->handle, method, &info); | |
1039 | ||
1040 | if (result) { | |
1041 | dev_warn(wmi_bus_dev, | |
1042 | "%s data block query control method not found", | |
1043 | method); | |
1044 | return result; | |
1045 | } | |
d4fc91ad | 1046 | |
fd70da6a | 1047 | wblock->dev.dev.type = &wmi_type_data; |
d4fc91ad | 1048 | |
fd70da6a DHV |
1049 | /* |
1050 | * The Microsoft documentation specifically states: | |
1051 | * | |
1052 | * Data blocks registered with only a single instance | |
1053 | * can ignore the parameter. | |
1054 | * | |
1055 | * ACPICA will get mad at us if we call the method with the wrong number | |
1056 | * of arguments, so check what our method expects. (On some Dell | |
1057 | * laptops, WQxx may not be a method at all.) | |
1058 | */ | |
1059 | if (info->type != ACPI_TYPE_METHOD || info->param_count == 0) | |
1060 | wblock->read_takes_no_args = true; | |
d4fc91ad | 1061 | |
fd70da6a | 1062 | kfree(info); |
d4fc91ad | 1063 | |
fd70da6a DHV |
1064 | strcpy(method, "WS"); |
1065 | strncat(method, wblock->gblock.object_id, 2); | |
1066 | result = get_subobj_info(device->handle, method, NULL); | |
d4fc91ad | 1067 | |
fd70da6a DHV |
1068 | if (result == 0) |
1069 | wblock->dev.setable = true; | |
d4fc91ad | 1070 | |
fd70da6a DHV |
1071 | out_init: |
1072 | wblock->dev.dev.bus = &wmi_bus_type; | |
1073 | wblock->dev.dev.parent = wmi_bus_dev; | |
d4fc91ad | 1074 | |
fd70da6a | 1075 | dev_set_name(&wblock->dev.dev, "%pUL", gblock->guid); |
1caab3c1 | 1076 | |
6ee50aaa | 1077 | device_initialize(&wblock->dev.dev); |
fd70da6a DHV |
1078 | |
1079 | return 0; | |
1caab3c1 MG |
1080 | } |
1081 | ||
b0e86302 | 1082 | static void wmi_free_devices(struct acpi_device *device) |
1caab3c1 | 1083 | { |
c64eefd4 | 1084 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
1085 | |
1086 | /* Delete devices for all the GUIDs */ | |
023b9565 | 1087 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
b0e86302 AL |
1088 | if (wblock->acpi_device == device) { |
1089 | list_del(&wblock->list); | |
6ee50aaa | 1090 | device_unregister(&wblock->dev.dev); |
b0e86302 | 1091 | } |
023b9565 | 1092 | } |
1caab3c1 MG |
1093 | } |
1094 | ||
b0e86302 AL |
1095 | static bool guid_already_parsed(struct acpi_device *device, |
1096 | const u8 *guid) | |
d1f9e497 | 1097 | { |
d1f9e497 | 1098 | struct wmi_block *wblock; |
d1f9e497 | 1099 | |
b0e86302 AL |
1100 | list_for_each_entry(wblock, &wmi_block_list, list) { |
1101 | if (memcmp(wblock->gblock.guid, guid, 16) == 0) { | |
1102 | /* | |
1103 | * Because we historically didn't track the relationship | |
1104 | * between GUIDs and ACPI nodes, we don't know whether | |
1105 | * we need to suppress GUIDs that are unique on a | |
1106 | * given node but duplicated across nodes. | |
1107 | */ | |
1108 | dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n", | |
1109 | guid, dev_name(&wblock->acpi_device->dev)); | |
d1f9e497 | 1110 | return true; |
b0e86302 AL |
1111 | } |
1112 | } | |
d1f9e497 | 1113 | |
c64eefd4 | 1114 | return false; |
2d5ab555 DT |
1115 | } |
1116 | ||
bff431e4 CC |
1117 | /* |
1118 | * Parse the _WDG method for the GUID data blocks | |
1119 | */ | |
844af950 | 1120 | static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device) |
bff431e4 CC |
1121 | { |
1122 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
37830662 | 1123 | const struct guid_block *gblock; |
6ee50aaa DHV |
1124 | struct wmi_block *wblock, *next; |
1125 | union acpi_object *obj; | |
bff431e4 | 1126 | acpi_status status; |
6ee50aaa | 1127 | int retval = 0; |
bff431e4 CC |
1128 | u32 i, total; |
1129 | ||
7f5809bf | 1130 | status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out); |
bff431e4 | 1131 | if (ACPI_FAILURE(status)) |
c64eefd4 | 1132 | return -ENXIO; |
bff431e4 CC |
1133 | |
1134 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 1135 | if (!obj) |
c64eefd4 | 1136 | return -ENXIO; |
bff431e4 | 1137 | |
64ed0ab8 | 1138 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 1139 | retval = -ENXIO; |
64ed0ab8 DT |
1140 | goto out_free_pointer; |
1141 | } | |
bff431e4 | 1142 | |
37830662 | 1143 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
1144 | total = obj->buffer.length / sizeof(struct guid_block); |
1145 | ||
bff431e4 | 1146 | for (i = 0; i < total; i++) { |
58f6425e CK |
1147 | if (debug_dump_wdg) |
1148 | wmi_dump_wdg(&gblock[i]); | |
1149 | ||
a1c31bcd AL |
1150 | /* |
1151 | * Some WMI devices, like those for nVidia hooks, have a | |
1152 | * duplicate GUID. It's not clear what we should do in this | |
1153 | * case yet, so for now, we'll just ignore the duplicate | |
1154 | * for device creation. | |
1155 | */ | |
1156 | if (guid_already_parsed(device, gblock[i].guid)) | |
1157 | continue; | |
1158 | ||
58f6425e | 1159 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
6ee50aaa DHV |
1160 | if (!wblock) { |
1161 | retval = -ENOMEM; | |
1162 | break; | |
1163 | } | |
58f6425e | 1164 | |
b0e86302 | 1165 | wblock->acpi_device = device; |
58f6425e CK |
1166 | wblock->gblock = gblock[i]; |
1167 | ||
fd70da6a DHV |
1168 | retval = wmi_create_device(wmi_bus_dev, &gblock[i], wblock, device); |
1169 | if (retval) { | |
1170 | kfree(wblock); | |
1171 | continue; | |
1172 | } | |
c64eefd4 | 1173 | |
58f6425e | 1174 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 1175 | |
fc3155b2 TR |
1176 | if (debug_event) { |
1177 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 1178 | wmi_method_enable(wblock, 1); |
fc3155b2 | 1179 | } |
bff431e4 CC |
1180 | } |
1181 | ||
6ee50aaa DHV |
1182 | /* |
1183 | * Now that all of the devices are created, add them to the | |
1184 | * device tree and probe subdrivers. | |
1185 | */ | |
1186 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { | |
1187 | if (wblock->acpi_device != device) | |
1188 | continue; | |
1189 | ||
1190 | retval = device_add(&wblock->dev.dev); | |
1191 | if (retval) { | |
1192 | dev_err(wmi_bus_dev, "failed to register %pULL\n", | |
1193 | wblock->gblock.guid); | |
1194 | if (debug_event) | |
1195 | wmi_method_enable(wblock, 0); | |
1196 | list_del(&wblock->list); | |
1197 | put_device(&wblock->dev.dev); | |
1198 | } | |
1199 | } | |
c64eefd4 | 1200 | |
a5167c5b AL |
1201 | out_free_pointer: |
1202 | kfree(out.pointer); | |
c64eefd4 | 1203 | return retval; |
bff431e4 CC |
1204 | } |
1205 | ||
1206 | /* | |
1207 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
1208 | * hand these off to the EC driver. | |
1209 | */ | |
1210 | static acpi_status | |
1211 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 1212 | u32 bits, u64 *value, |
bff431e4 CC |
1213 | void *handler_context, void *region_context) |
1214 | { | |
1215 | int result = 0, i = 0; | |
1216 | u8 temp = 0; | |
1217 | ||
1218 | if ((address > 0xFF) || !value) | |
1219 | return AE_BAD_PARAMETER; | |
1220 | ||
1221 | if (function != ACPI_READ && function != ACPI_WRITE) | |
1222 | return AE_BAD_PARAMETER; | |
1223 | ||
1224 | if (bits != 8) | |
1225 | return AE_BAD_PARAMETER; | |
1226 | ||
1227 | if (function == ACPI_READ) { | |
1228 | result = ec_read(address, &temp); | |
439913ff | 1229 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
1230 | } else { |
1231 | temp = 0xff & ((*value) >> i); | |
1232 | result = ec_write(address, temp); | |
1233 | } | |
1234 | ||
1235 | switch (result) { | |
1236 | case -EINVAL: | |
1237 | return AE_BAD_PARAMETER; | |
1238 | break; | |
1239 | case -ENODEV: | |
1240 | return AE_NOT_FOUND; | |
1241 | break; | |
1242 | case -ETIME: | |
1243 | return AE_TIME; | |
1244 | break; | |
1245 | default: | |
1246 | return AE_OK; | |
1247 | } | |
1248 | } | |
1249 | ||
1686f544 AL |
1250 | static void acpi_wmi_notify_handler(acpi_handle handle, u32 event, |
1251 | void *context) | |
bff431e4 CC |
1252 | { |
1253 | struct guid_block *block; | |
1254 | struct wmi_block *wblock; | |
1686f544 | 1255 | bool found_it = false; |
bff431e4 | 1256 | |
cedb3b2a | 1257 | list_for_each_entry(wblock, &wmi_block_list, list) { |
bff431e4 CC |
1258 | block = &wblock->gblock; |
1259 | ||
1686f544 | 1260 | if (wblock->acpi_device->handle == handle && |
b0e86302 | 1261 | (block->flags & ACPI_WMI_EVENT) && |
1686f544 AL |
1262 | (block->notify_id == event)) |
1263 | { | |
1264 | found_it = true; | |
bff431e4 CC |
1265 | break; |
1266 | } | |
1267 | } | |
1686f544 AL |
1268 | |
1269 | if (!found_it) | |
1270 | return; | |
1271 | ||
1272 | /* If a driver is bound, then notify the driver. */ | |
1273 | if (wblock->dev.dev.driver) { | |
1274 | struct wmi_driver *driver; | |
1275 | struct acpi_object_list input; | |
1276 | union acpi_object params[1]; | |
1277 | struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL }; | |
1278 | acpi_status status; | |
1279 | ||
1280 | driver = container_of(wblock->dev.dev.driver, | |
1281 | struct wmi_driver, driver); | |
1282 | ||
1283 | input.count = 1; | |
1284 | input.pointer = params; | |
1285 | params[0].type = ACPI_TYPE_INTEGER; | |
1286 | params[0].integer.value = event; | |
1287 | ||
1288 | status = acpi_evaluate_object(wblock->acpi_device->handle, | |
1289 | "_WED", &input, &evdata); | |
1290 | if (ACPI_FAILURE(status)) { | |
1291 | dev_warn(&wblock->dev.dev, | |
1292 | "failed to get event data\n"); | |
1293 | return; | |
1294 | } | |
1295 | ||
1296 | if (driver->notify) | |
1297 | driver->notify(&wblock->dev, | |
1298 | (union acpi_object *)evdata.pointer); | |
1299 | ||
1300 | kfree(evdata.pointer); | |
1301 | } else if (wblock->handler) { | |
1302 | /* Legacy handler */ | |
1303 | wblock->handler(event, wblock->handler_data); | |
1304 | } | |
1305 | ||
1306 | if (debug_event) { | |
1307 | pr_info("DEBUG Event GUID: %pUL\n", | |
1308 | wblock->gblock.guid); | |
1309 | } | |
1310 | ||
1311 | acpi_bus_generate_netlink_event( | |
1312 | wblock->acpi_device->pnp.device_class, | |
1313 | dev_name(&wblock->dev.dev), | |
1314 | event, 0); | |
1315 | ||
bff431e4 CC |
1316 | } |
1317 | ||
9599ed91 | 1318 | static int acpi_wmi_remove(struct platform_device *device) |
bff431e4 | 1319 | { |
9599ed91 AL |
1320 | struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev); |
1321 | ||
1322 | acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY, | |
1686f544 | 1323 | acpi_wmi_notify_handler); |
9599ed91 | 1324 | acpi_remove_address_space_handler(acpi_device->handle, |
bff431e4 | 1325 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); |
9599ed91 | 1326 | wmi_free_devices(acpi_device); |
7b11e898 | 1327 | device_destroy(&wmi_bus_class, MKDEV(0, 0)); |
bff431e4 CC |
1328 | |
1329 | return 0; | |
1330 | } | |
1331 | ||
9599ed91 | 1332 | static int acpi_wmi_probe(struct platform_device *device) |
bff431e4 | 1333 | { |
9599ed91 | 1334 | struct acpi_device *acpi_device; |
844af950 | 1335 | struct device *wmi_bus_dev; |
bff431e4 | 1336 | acpi_status status; |
c64eefd4 | 1337 | int error; |
bff431e4 | 1338 | |
9599ed91 AL |
1339 | acpi_device = ACPI_COMPANION(&device->dev); |
1340 | if (!acpi_device) { | |
1341 | dev_err(&device->dev, "ACPI companion is missing\n"); | |
1342 | return -ENODEV; | |
1343 | } | |
1344 | ||
1345 | status = acpi_install_address_space_handler(acpi_device->handle, | |
bff431e4 CC |
1346 | ACPI_ADR_SPACE_EC, |
1347 | &acpi_wmi_ec_space_handler, | |
1348 | NULL, NULL); | |
5212cd67 | 1349 | if (ACPI_FAILURE(status)) { |
46492ee4 | 1350 | dev_err(&device->dev, "Error installing EC region handler\n"); |
bff431e4 | 1351 | return -ENODEV; |
5212cd67 | 1352 | } |
bff431e4 | 1353 | |
9599ed91 AL |
1354 | status = acpi_install_notify_handler(acpi_device->handle, |
1355 | ACPI_DEVICE_NOTIFY, | |
1686f544 AL |
1356 | acpi_wmi_notify_handler, |
1357 | NULL); | |
1358 | if (ACPI_FAILURE(status)) { | |
1359 | dev_err(&device->dev, "Error installing notify handler\n"); | |
1360 | error = -ENODEV; | |
1361 | goto err_remove_ec_handler; | |
1362 | } | |
1363 | ||
844af950 AL |
1364 | wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0), |
1365 | NULL, "wmi_bus-%s", dev_name(&device->dev)); | |
1366 | if (IS_ERR(wmi_bus_dev)) { | |
1367 | error = PTR_ERR(wmi_bus_dev); | |
1686f544 | 1368 | goto err_remove_notify_handler; |
844af950 | 1369 | } |
9599ed91 | 1370 | dev_set_drvdata(&device->dev, wmi_bus_dev); |
844af950 | 1371 | |
9599ed91 | 1372 | error = parse_wdg(wmi_bus_dev, acpi_device); |
c64eefd4 | 1373 | if (error) { |
8e07514d | 1374 | pr_err("Failed to parse WDG method\n"); |
844af950 | 1375 | goto err_remove_busdev; |
bff431e4 CC |
1376 | } |
1377 | ||
c64eefd4 | 1378 | return 0; |
46492ee4 | 1379 | |
844af950 | 1380 | err_remove_busdev: |
7b11e898 | 1381 | device_destroy(&wmi_bus_class, MKDEV(0, 0)); |
844af950 | 1382 | |
1686f544 | 1383 | err_remove_notify_handler: |
9599ed91 | 1384 | acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY, |
1686f544 AL |
1385 | acpi_wmi_notify_handler); |
1386 | ||
1387 | err_remove_ec_handler: | |
9599ed91 | 1388 | acpi_remove_address_space_handler(acpi_device->handle, |
46492ee4 AL |
1389 | ACPI_ADR_SPACE_EC, |
1390 | &acpi_wmi_ec_space_handler); | |
1391 | ||
1392 | return error; | |
bff431e4 CC |
1393 | } |
1394 | ||
844af950 AL |
1395 | int __must_check __wmi_driver_register(struct wmi_driver *driver, |
1396 | struct module *owner) | |
1397 | { | |
1398 | driver->driver.owner = owner; | |
1399 | driver->driver.bus = &wmi_bus_type; | |
1400 | ||
1401 | return driver_register(&driver->driver); | |
1402 | } | |
1403 | EXPORT_SYMBOL(__wmi_driver_register); | |
1404 | ||
1405 | void wmi_driver_unregister(struct wmi_driver *driver) | |
1406 | { | |
1407 | driver_unregister(&driver->driver); | |
1408 | } | |
1409 | EXPORT_SYMBOL(wmi_driver_unregister); | |
1410 | ||
bff431e4 CC |
1411 | static int __init acpi_wmi_init(void) |
1412 | { | |
c64eefd4 | 1413 | int error; |
bff431e4 CC |
1414 | |
1415 | if (acpi_disabled) | |
1416 | return -ENODEV; | |
1417 | ||
844af950 | 1418 | error = class_register(&wmi_bus_class); |
c64eefd4 DT |
1419 | if (error) |
1420 | return error; | |
1caab3c1 | 1421 | |
844af950 AL |
1422 | error = bus_register(&wmi_bus_type); |
1423 | if (error) | |
1424 | goto err_unreg_class; | |
1425 | ||
9599ed91 | 1426 | error = platform_driver_register(&acpi_wmi_driver); |
c64eefd4 DT |
1427 | if (error) { |
1428 | pr_err("Error loading mapper\n"); | |
844af950 | 1429 | goto err_unreg_bus; |
bff431e4 CC |
1430 | } |
1431 | ||
8e07514d | 1432 | return 0; |
844af950 | 1433 | |
844af950 AL |
1434 | err_unreg_bus: |
1435 | bus_unregister(&wmi_bus_type); | |
1436 | ||
97277717 AK |
1437 | err_unreg_class: |
1438 | class_unregister(&wmi_bus_class); | |
1439 | ||
844af950 | 1440 | return error; |
bff431e4 CC |
1441 | } |
1442 | ||
1443 | static void __exit acpi_wmi_exit(void) | |
1444 | { | |
9599ed91 | 1445 | platform_driver_unregister(&acpi_wmi_driver); |
844af950 | 1446 | bus_unregister(&wmi_bus_type); |
303d1fcc | 1447 | class_unregister(&wmi_bus_class); |
bff431e4 CC |
1448 | } |
1449 | ||
98b8e4e5 | 1450 | subsys_initcall_sync(acpi_wmi_init); |
bff431e4 | 1451 | module_exit(acpi_wmi_exit); |