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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
bff431e4 CC |
2 | /* |
3 | * ACPI-WMI mapping driver | |
4 | * | |
5 | * Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk> | |
6 | * | |
7 | * GUID parsing code from ldm.c is: | |
8 | * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org> | |
9 | * Copyright (c) 2001-2007 Anton Altaparmakov | |
10 | * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com> | |
11 | * | |
2c9c5664 DHV |
12 | * WMI bus infrastructure by Andrew Lutomirski and Darren Hart: |
13 | * Copyright (C) 2015 Andrew Lutomirski | |
14 | * Copyright (C) 2017 VMware, Inc. All Rights Reserved. | |
bff431e4 CC |
15 | */ |
16 | ||
8e07514d DT |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
b60ee4e0 | 19 | #include <linux/acpi.h> |
1caab3c1 | 20 | #include <linux/device.h> |
b60ee4e0 ML |
21 | #include <linux/init.h> |
22 | #include <linux/kernel.h> | |
bff431e4 | 23 | #include <linux/list.h> |
44b6b766 | 24 | #include <linux/miscdevice.h> |
7c52d551 | 25 | #include <linux/module.h> |
9599ed91 | 26 | #include <linux/platform_device.h> |
b60ee4e0 ML |
27 | #include <linux/slab.h> |
28 | #include <linux/types.h> | |
44b6b766 | 29 | #include <linux/uaccess.h> |
538d7eb8 | 30 | #include <linux/uuid.h> |
b60ee4e0 | 31 | #include <linux/wmi.h> |
df23e2be | 32 | #include <linux/fs.h> |
44b6b766 | 33 | #include <uapi/linux/wmi.h> |
bff431e4 | 34 | |
bff431e4 CC |
35 | MODULE_AUTHOR("Carlos Corbacho"); |
36 | MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
762e1a2f | 39 | static LIST_HEAD(wmi_block_list); |
bff431e4 CC |
40 | |
41 | struct guid_block { | |
42 | char guid[16]; | |
43 | union { | |
44 | char object_id[2]; | |
45 | struct { | |
46 | unsigned char notify_id; | |
47 | unsigned char reserved; | |
48 | }; | |
49 | }; | |
50 | u8 instance_count; | |
51 | u8 flags; | |
52 | }; | |
53 | ||
54 | struct wmi_block { | |
844af950 | 55 | struct wmi_device dev; |
bff431e4 CC |
56 | struct list_head list; |
57 | struct guid_block gblock; | |
44b6b766 ML |
58 | struct miscdevice char_dev; |
59 | struct mutex char_mutex; | |
b0e86302 | 60 | struct acpi_device *acpi_device; |
bff431e4 CC |
61 | wmi_notify_handler handler; |
62 | void *handler_data; | |
44b6b766 | 63 | u64 req_buf_size; |
d4fc91ad | 64 | |
fd70da6a | 65 | bool read_takes_no_args; |
bff431e4 CC |
66 | }; |
67 | ||
bff431e4 CC |
68 | |
69 | /* | |
70 | * If the GUID data block is marked as expensive, we must enable and | |
71 | * explicitily disable data collection. | |
72 | */ | |
73 | #define ACPI_WMI_EXPENSIVE 0x1 | |
74 | #define ACPI_WMI_METHOD 0x2 /* GUID is a method */ | |
75 | #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */ | |
76 | #define ACPI_WMI_EVENT 0x8 /* GUID is an event */ | |
77 | ||
90ab5ee9 | 78 | static bool debug_event; |
fc3155b2 TR |
79 | module_param(debug_event, bool, 0444); |
80 | MODULE_PARM_DESC(debug_event, | |
81 | "Log WMI Events [0/1]"); | |
82 | ||
90ab5ee9 | 83 | static bool debug_dump_wdg; |
a929aae0 TR |
84 | module_param(debug_dump_wdg, bool, 0444); |
85 | MODULE_PARM_DESC(debug_dump_wdg, | |
86 | "Dump available WMI interfaces [0/1]"); | |
87 | ||
9599ed91 AL |
88 | static int acpi_wmi_remove(struct platform_device *device); |
89 | static int acpi_wmi_probe(struct platform_device *device); | |
bff431e4 CC |
90 | |
91 | static const struct acpi_device_id wmi_device_ids[] = { | |
92 | {"PNP0C14", 0}, | |
93 | {"pnp0c14", 0}, | |
94 | {"", 0}, | |
95 | }; | |
96 | MODULE_DEVICE_TABLE(acpi, wmi_device_ids); | |
97 | ||
9599ed91 AL |
98 | static struct platform_driver acpi_wmi_driver = { |
99 | .driver = { | |
100 | .name = "acpi-wmi", | |
101 | .acpi_match_table = wmi_device_ids, | |
c64eefd4 | 102 | }, |
9599ed91 AL |
103 | .probe = acpi_wmi_probe, |
104 | .remove = acpi_wmi_remove, | |
bff431e4 CC |
105 | }; |
106 | ||
107 | /* | |
108 | * GUID parsing functions | |
109 | */ | |
110 | ||
bff431e4 CC |
111 | static bool find_guid(const char *guid_string, struct wmi_block **out) |
112 | { | |
f9dffc14 | 113 | guid_t guid_input; |
bff431e4 CC |
114 | struct wmi_block *wblock; |
115 | struct guid_block *block; | |
bff431e4 | 116 | |
f9dffc14 | 117 | if (guid_parse(guid_string, &guid_input)) |
538d7eb8 | 118 | return false; |
bff431e4 | 119 | |
cedb3b2a | 120 | list_for_each_entry(wblock, &wmi_block_list, list) { |
bff431e4 CC |
121 | block = &wblock->gblock; |
122 | ||
538d7eb8 | 123 | if (memcmp(block->guid, &guid_input, 16) == 0) { |
bff431e4 CC |
124 | if (out) |
125 | *out = wblock; | |
097c27fc | 126 | return true; |
bff431e4 CC |
127 | } |
128 | } | |
097c27fc | 129 | return false; |
bff431e4 CC |
130 | } |
131 | ||
a48e2338 MJ |
132 | static const void *find_guid_context(struct wmi_block *wblock, |
133 | struct wmi_driver *wdriver) | |
134 | { | |
135 | const struct wmi_device_id *id; | |
f9dffc14 | 136 | guid_t guid_input; |
a48e2338 MJ |
137 | |
138 | if (wblock == NULL || wdriver == NULL) | |
139 | return NULL; | |
140 | if (wdriver->id_table == NULL) | |
141 | return NULL; | |
142 | ||
143 | id = wdriver->id_table; | |
144 | while (*id->guid_string) { | |
f9dffc14 | 145 | if (guid_parse(id->guid_string, &guid_input)) |
a48e2338 MJ |
146 | continue; |
147 | if (!memcmp(wblock->gblock.guid, &guid_input, 16)) | |
148 | return id->context; | |
149 | id++; | |
150 | } | |
151 | return NULL; | |
152 | } | |
153 | ||
d4fc91ad AL |
154 | static int get_subobj_info(acpi_handle handle, const char *pathname, |
155 | struct acpi_device_info **info) | |
156 | { | |
157 | struct acpi_device_info *dummy_info, **info_ptr; | |
158 | acpi_handle subobj_handle; | |
159 | acpi_status status; | |
160 | ||
161 | status = acpi_get_handle(handle, (char *)pathname, &subobj_handle); | |
162 | if (status == AE_NOT_FOUND) | |
163 | return -ENOENT; | |
164 | else if (ACPI_FAILURE(status)) | |
165 | return -EIO; | |
166 | ||
167 | info_ptr = info ? info : &dummy_info; | |
168 | status = acpi_get_object_info(subobj_handle, info_ptr); | |
169 | if (ACPI_FAILURE(status)) | |
170 | return -EIO; | |
171 | ||
172 | if (!info) | |
173 | kfree(dummy_info); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
a66bfa7a MG |
178 | static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) |
179 | { | |
180 | struct guid_block *block = NULL; | |
181 | char method[5]; | |
a66bfa7a MG |
182 | acpi_status status; |
183 | acpi_handle handle; | |
184 | ||
185 | block = &wblock->gblock; | |
b0e86302 | 186 | handle = wblock->acpi_device->handle; |
a66bfa7a | 187 | |
a66bfa7a | 188 | snprintf(method, 5, "WE%02X", block->notify_id); |
8122ab66 | 189 | status = acpi_execute_simple_method(handle, method, enable); |
a66bfa7a MG |
190 | |
191 | if (status != AE_OK && status != AE_NOT_FOUND) | |
192 | return status; | |
193 | else | |
194 | return AE_OK; | |
195 | } | |
196 | ||
bff431e4 CC |
197 | /* |
198 | * Exported WMI functions | |
199 | */ | |
44b6b766 ML |
200 | |
201 | /** | |
202 | * set_required_buffer_size - Sets the buffer size needed for performing IOCTL | |
203 | * @wdev: A wmi bus device from a driver | |
5a707af1 | 204 | * @length: Required buffer size |
44b6b766 ML |
205 | * |
206 | * Allocates memory needed for buffer, stores the buffer size in that memory | |
207 | */ | |
208 | int set_required_buffer_size(struct wmi_device *wdev, u64 length) | |
209 | { | |
210 | struct wmi_block *wblock; | |
211 | ||
212 | wblock = container_of(wdev, struct wmi_block, dev); | |
213 | wblock->req_buf_size = length; | |
214 | ||
215 | return 0; | |
216 | } | |
217 | EXPORT_SYMBOL_GPL(set_required_buffer_size); | |
218 | ||
bff431e4 CC |
219 | /** |
220 | * wmi_evaluate_method - Evaluate a WMI method | |
221 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
222 | * @instance: Instance index | |
223 | * @method_id: Method ID to call | |
5a707af1 AS |
224 | * @in: Buffer containing input for the method call |
225 | * @out: Empty buffer to return the method results | |
bff431e4 CC |
226 | * |
227 | * Call an ACPI-WMI method | |
228 | */ | |
229 | acpi_status wmi_evaluate_method(const char *guid_string, u8 instance, | |
230 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
722c856d ML |
231 | { |
232 | struct wmi_block *wblock = NULL; | |
233 | ||
234 | if (!find_guid(guid_string, &wblock)) | |
235 | return AE_ERROR; | |
236 | return wmidev_evaluate_method(&wblock->dev, instance, method_id, | |
237 | in, out); | |
238 | } | |
239 | EXPORT_SYMBOL_GPL(wmi_evaluate_method); | |
240 | ||
241 | /** | |
242 | * wmidev_evaluate_method - Evaluate a WMI method | |
243 | * @wdev: A wmi bus device from a driver | |
244 | * @instance: Instance index | |
245 | * @method_id: Method ID to call | |
5a707af1 AS |
246 | * @in: Buffer containing input for the method call |
247 | * @out: Empty buffer to return the method results | |
722c856d ML |
248 | * |
249 | * Call an ACPI-WMI method | |
250 | */ | |
251 | acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance, | |
252 | u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out) | |
bff431e4 CC |
253 | { |
254 | struct guid_block *block = NULL; | |
255 | struct wmi_block *wblock = NULL; | |
256 | acpi_handle handle; | |
257 | acpi_status status; | |
258 | struct acpi_object_list input; | |
259 | union acpi_object params[3]; | |
f3d83e24 | 260 | char method[5] = "WM"; |
bff431e4 | 261 | |
722c856d | 262 | wblock = container_of(wdev, struct wmi_block, dev); |
bff431e4 | 263 | block = &wblock->gblock; |
b0e86302 | 264 | handle = wblock->acpi_device->handle; |
bff431e4 | 265 | |
e6bafba5 | 266 | if (!(block->flags & ACPI_WMI_METHOD)) |
bff431e4 CC |
267 | return AE_BAD_DATA; |
268 | ||
6afa1e2a | 269 | if (block->instance_count <= instance) |
bff431e4 CC |
270 | return AE_BAD_PARAMETER; |
271 | ||
272 | input.count = 2; | |
273 | input.pointer = params; | |
274 | params[0].type = ACPI_TYPE_INTEGER; | |
275 | params[0].integer.value = instance; | |
276 | params[1].type = ACPI_TYPE_INTEGER; | |
277 | params[1].integer.value = method_id; | |
278 | ||
279 | if (in) { | |
280 | input.count = 3; | |
281 | ||
282 | if (block->flags & ACPI_WMI_STRING) { | |
283 | params[2].type = ACPI_TYPE_STRING; | |
284 | } else { | |
285 | params[2].type = ACPI_TYPE_BUFFER; | |
286 | } | |
287 | params[2].buffer.length = in->length; | |
288 | params[2].buffer.pointer = in->pointer; | |
289 | } | |
290 | ||
291 | strncat(method, block->object_id, 2); | |
292 | ||
293 | status = acpi_evaluate_object(handle, method, &input, out); | |
294 | ||
295 | return status; | |
296 | } | |
722c856d | 297 | EXPORT_SYMBOL_GPL(wmidev_evaluate_method); |
bff431e4 | 298 | |
56a37025 AL |
299 | static acpi_status __query_block(struct wmi_block *wblock, u8 instance, |
300 | struct acpi_buffer *out) | |
bff431e4 CC |
301 | { |
302 | struct guid_block *block = NULL; | |
54f14c27 | 303 | acpi_handle handle; |
bff431e4 | 304 | acpi_status status, wc_status = AE_ERROR; |
8122ab66 ZR |
305 | struct acpi_object_list input; |
306 | union acpi_object wq_params[1]; | |
f3d83e24 CL |
307 | char method[5]; |
308 | char wc_method[5] = "WC"; | |
bff431e4 | 309 | |
56a37025 | 310 | if (!out) |
bff431e4 CC |
311 | return AE_BAD_PARAMETER; |
312 | ||
bff431e4 | 313 | block = &wblock->gblock; |
b0e86302 | 314 | handle = wblock->acpi_device->handle; |
bff431e4 | 315 | |
6afa1e2a | 316 | if (block->instance_count <= instance) |
bff431e4 CC |
317 | return AE_BAD_PARAMETER; |
318 | ||
319 | /* Check GUID is a data block */ | |
320 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 321 | return AE_ERROR; |
bff431e4 CC |
322 | |
323 | input.count = 1; | |
324 | input.pointer = wq_params; | |
325 | wq_params[0].type = ACPI_TYPE_INTEGER; | |
326 | wq_params[0].integer.value = instance; | |
327 | ||
d4fc91ad AL |
328 | if (instance == 0 && wblock->read_takes_no_args) |
329 | input.count = 0; | |
330 | ||
bff431e4 CC |
331 | /* |
332 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to | |
333 | * enable collection. | |
334 | */ | |
335 | if (block->flags & ACPI_WMI_EXPENSIVE) { | |
bff431e4 CC |
336 | strncat(wc_method, block->object_id, 2); |
337 | ||
338 | /* | |
339 | * Some GUIDs break the specification by declaring themselves | |
340 | * expensive, but have no corresponding WCxx method. So we | |
341 | * should not fail if this happens. | |
342 | */ | |
bad9da86 | 343 | wc_status = acpi_execute_simple_method(handle, wc_method, 1); |
bff431e4 CC |
344 | } |
345 | ||
346 | strcpy(method, "WQ"); | |
347 | strncat(method, block->object_id, 2); | |
348 | ||
dab36ad8 | 349 | status = acpi_evaluate_object(handle, method, &input, out); |
bff431e4 CC |
350 | |
351 | /* | |
352 | * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if | |
353 | * the WQxx method failed - we should disable collection anyway. | |
354 | */ | |
a527f2d7 | 355 | if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { |
8e914490 BP |
356 | /* |
357 | * Ignore whether this WCxx call succeeds or not since | |
358 | * the previously executed WQxx method call might have | |
359 | * succeeded, and returning the failing status code | |
360 | * of this call would throw away the result of the WQxx | |
361 | * call, potentially leaking memory. | |
362 | */ | |
363 | acpi_execute_simple_method(handle, wc_method, 0); | |
bff431e4 CC |
364 | } |
365 | ||
366 | return status; | |
367 | } | |
56a37025 AL |
368 | |
369 | /** | |
370 | * wmi_query_block - Return contents of a WMI block (deprecated) | |
371 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
372 | * @instance: Instance index | |
5a707af1 | 373 | * @out: Empty buffer to return the contents of the data block to |
56a37025 AL |
374 | * |
375 | * Return the contents of an ACPI-WMI data block to a buffer | |
376 | */ | |
377 | acpi_status wmi_query_block(const char *guid_string, u8 instance, | |
378 | struct acpi_buffer *out) | |
379 | { | |
380 | struct wmi_block *wblock; | |
381 | ||
382 | if (!guid_string) | |
383 | return AE_BAD_PARAMETER; | |
384 | ||
385 | if (!find_guid(guid_string, &wblock)) | |
386 | return AE_ERROR; | |
387 | ||
388 | return __query_block(wblock, instance, out); | |
389 | } | |
bff431e4 CC |
390 | EXPORT_SYMBOL_GPL(wmi_query_block); |
391 | ||
56a37025 AL |
392 | union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance) |
393 | { | |
394 | struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; | |
395 | struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev); | |
396 | ||
397 | if (ACPI_FAILURE(__query_block(wblock, instance, &out))) | |
398 | return NULL; | |
399 | ||
400 | return (union acpi_object *)out.pointer; | |
401 | } | |
402 | EXPORT_SYMBOL_GPL(wmidev_block_query); | |
403 | ||
bff431e4 CC |
404 | /** |
405 | * wmi_set_block - Write to a WMI block | |
406 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
407 | * @instance: Instance index | |
5a707af1 | 408 | * @in: Buffer containing new values for the data block |
bff431e4 CC |
409 | * |
410 | * Write the contents of the input buffer to an ACPI-WMI data block | |
411 | */ | |
412 | acpi_status wmi_set_block(const char *guid_string, u8 instance, | |
56a37025 | 413 | const struct acpi_buffer *in) |
bff431e4 CC |
414 | { |
415 | struct guid_block *block = NULL; | |
416 | struct wmi_block *wblock = NULL; | |
417 | acpi_handle handle; | |
418 | struct acpi_object_list input; | |
419 | union acpi_object params[2]; | |
f3d83e24 | 420 | char method[5] = "WS"; |
bff431e4 CC |
421 | |
422 | if (!guid_string || !in) | |
423 | return AE_BAD_DATA; | |
424 | ||
425 | if (!find_guid(guid_string, &wblock)) | |
08237974 | 426 | return AE_ERROR; |
bff431e4 CC |
427 | |
428 | block = &wblock->gblock; | |
b0e86302 | 429 | handle = wblock->acpi_device->handle; |
bff431e4 | 430 | |
6afa1e2a | 431 | if (block->instance_count <= instance) |
bff431e4 CC |
432 | return AE_BAD_PARAMETER; |
433 | ||
434 | /* Check GUID is a data block */ | |
435 | if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD)) | |
08237974 | 436 | return AE_ERROR; |
bff431e4 CC |
437 | |
438 | input.count = 2; | |
439 | input.pointer = params; | |
440 | params[0].type = ACPI_TYPE_INTEGER; | |
441 | params[0].integer.value = instance; | |
442 | ||
443 | if (block->flags & ACPI_WMI_STRING) { | |
444 | params[1].type = ACPI_TYPE_STRING; | |
445 | } else { | |
446 | params[1].type = ACPI_TYPE_BUFFER; | |
447 | } | |
448 | params[1].buffer.length = in->length; | |
449 | params[1].buffer.pointer = in->pointer; | |
450 | ||
451 | strncat(method, block->object_id, 2); | |
452 | ||
453 | return acpi_evaluate_object(handle, method, &input, NULL); | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(wmi_set_block); | |
456 | ||
37830662 | 457 | static void wmi_dump_wdg(const struct guid_block *g) |
a929aae0 | 458 | { |
85b4e4eb | 459 | pr_info("%pUL:\n", g->guid); |
cd3921f8 PR |
460 | if (g->flags & ACPI_WMI_EVENT) |
461 | pr_info("\tnotify_id: 0x%02X\n", g->notify_id); | |
462 | else | |
463 | pr_info("\tobject_id: %2pE\n", g->object_id); | |
8e07514d | 464 | pr_info("\tinstance_count: %d\n", g->instance_count); |
dd8e908e | 465 | pr_info("\tflags: %#x", g->flags); |
a929aae0 | 466 | if (g->flags) { |
a929aae0 | 467 | if (g->flags & ACPI_WMI_EXPENSIVE) |
dd8e908e | 468 | pr_cont(" ACPI_WMI_EXPENSIVE"); |
a929aae0 | 469 | if (g->flags & ACPI_WMI_METHOD) |
dd8e908e | 470 | pr_cont(" ACPI_WMI_METHOD"); |
a929aae0 | 471 | if (g->flags & ACPI_WMI_STRING) |
dd8e908e | 472 | pr_cont(" ACPI_WMI_STRING"); |
a929aae0 | 473 | if (g->flags & ACPI_WMI_EVENT) |
dd8e908e | 474 | pr_cont(" ACPI_WMI_EVENT"); |
a929aae0 | 475 | } |
8e07514d | 476 | pr_cont("\n"); |
a929aae0 TR |
477 | |
478 | } | |
479 | ||
fc3155b2 TR |
480 | static void wmi_notify_debug(u32 value, void *context) |
481 | { | |
482 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
483 | union acpi_object *obj; | |
1492616a | 484 | acpi_status status; |
fc3155b2 | 485 | |
1492616a AL |
486 | status = wmi_get_event_data(value, &response); |
487 | if (status != AE_OK) { | |
8e07514d | 488 | pr_info("bad event status 0x%x\n", status); |
1492616a AL |
489 | return; |
490 | } | |
fc3155b2 TR |
491 | |
492 | obj = (union acpi_object *)response.pointer; | |
493 | ||
494 | if (!obj) | |
495 | return; | |
496 | ||
8e07514d | 497 | pr_info("DEBUG Event "); |
fc3155b2 TR |
498 | switch(obj->type) { |
499 | case ACPI_TYPE_BUFFER: | |
8e07514d | 500 | pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length); |
fc3155b2 TR |
501 | break; |
502 | case ACPI_TYPE_STRING: | |
8e07514d | 503 | pr_cont("STRING_TYPE - %s\n", obj->string.pointer); |
fc3155b2 TR |
504 | break; |
505 | case ACPI_TYPE_INTEGER: | |
8e07514d | 506 | pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value); |
fc3155b2 TR |
507 | break; |
508 | case ACPI_TYPE_PACKAGE: | |
8e07514d | 509 | pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count); |
fc3155b2 TR |
510 | break; |
511 | default: | |
8e07514d | 512 | pr_cont("object type 0x%X\n", obj->type); |
fc3155b2 | 513 | } |
1492616a | 514 | kfree(obj); |
fc3155b2 TR |
515 | } |
516 | ||
bff431e4 CC |
517 | /** |
518 | * wmi_install_notify_handler - Register handler for WMI events | |
5a707af1 | 519 | * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba |
bff431e4 CC |
520 | * @handler: Function to handle notifications |
521 | * @data: Data to be returned to handler when event is fired | |
522 | * | |
523 | * Register a handler for events sent to the ACPI-WMI mapper device. | |
524 | */ | |
525 | acpi_status wmi_install_notify_handler(const char *guid, | |
526 | wmi_notify_handler handler, void *data) | |
527 | { | |
528 | struct wmi_block *block; | |
58f6425e | 529 | acpi_status status = AE_NOT_EXIST; |
f9dffc14 | 530 | guid_t guid_input; |
bff431e4 CC |
531 | |
532 | if (!guid || !handler) | |
533 | return AE_BAD_PARAMETER; | |
534 | ||
f9dffc14 | 535 | if (guid_parse(guid, &guid_input)) |
538d7eb8 | 536 | return AE_BAD_PARAMETER; |
bff431e4 | 537 | |
cedb3b2a | 538 | list_for_each_entry(block, &wmi_block_list, list) { |
58f6425e | 539 | acpi_status wmi_status; |
58f6425e | 540 | |
538d7eb8 | 541 | if (memcmp(block->gblock.guid, &guid_input, 16) == 0) { |
58f6425e CK |
542 | if (block->handler && |
543 | block->handler != wmi_notify_debug) | |
544 | return AE_ALREADY_ACQUIRED; | |
bff431e4 | 545 | |
58f6425e CK |
546 | block->handler = handler; |
547 | block->handler_data = data; | |
bff431e4 | 548 | |
58f6425e CK |
549 | wmi_status = wmi_method_enable(block, 1); |
550 | if ((wmi_status != AE_OK) || | |
551 | ((wmi_status == AE_OK) && (status == AE_NOT_EXIST))) | |
552 | status = wmi_status; | |
553 | } | |
554 | } | |
a66bfa7a MG |
555 | |
556 | return status; | |
bff431e4 CC |
557 | } |
558 | EXPORT_SYMBOL_GPL(wmi_install_notify_handler); | |
559 | ||
560 | /** | |
561 | * wmi_uninstall_notify_handler - Unregister handler for WMI events | |
5a707af1 | 562 | * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba |
bff431e4 CC |
563 | * |
564 | * Unregister handler for events sent to the ACPI-WMI mapper device. | |
565 | */ | |
566 | acpi_status wmi_remove_notify_handler(const char *guid) | |
567 | { | |
568 | struct wmi_block *block; | |
58f6425e | 569 | acpi_status status = AE_NOT_EXIST; |
f9dffc14 | 570 | guid_t guid_input; |
bff431e4 CC |
571 | |
572 | if (!guid) | |
573 | return AE_BAD_PARAMETER; | |
574 | ||
f9dffc14 | 575 | if (guid_parse(guid, &guid_input)) |
538d7eb8 | 576 | return AE_BAD_PARAMETER; |
bff431e4 | 577 | |
cedb3b2a | 578 | list_for_each_entry(block, &wmi_block_list, list) { |
58f6425e | 579 | acpi_status wmi_status; |
58f6425e | 580 | |
538d7eb8 | 581 | if (memcmp(block->gblock.guid, &guid_input, 16) == 0) { |
58f6425e CK |
582 | if (!block->handler || |
583 | block->handler == wmi_notify_debug) | |
584 | return AE_NULL_ENTRY; | |
585 | ||
586 | if (debug_event) { | |
587 | block->handler = wmi_notify_debug; | |
588 | status = AE_OK; | |
589 | } else { | |
590 | wmi_status = wmi_method_enable(block, 0); | |
591 | block->handler = NULL; | |
592 | block->handler_data = NULL; | |
593 | if ((wmi_status != AE_OK) || | |
594 | ((wmi_status == AE_OK) && | |
595 | (status == AE_NOT_EXIST))) | |
596 | status = wmi_status; | |
597 | } | |
598 | } | |
fc3155b2 | 599 | } |
58f6425e | 600 | |
a66bfa7a | 601 | return status; |
bff431e4 CC |
602 | } |
603 | EXPORT_SYMBOL_GPL(wmi_remove_notify_handler); | |
604 | ||
605 | /** | |
606 | * wmi_get_event_data - Get WMI data associated with an event | |
607 | * | |
3e9b988e AA |
608 | * @event: Event to find |
609 | * @out: Buffer to hold event data. out->pointer should be freed with kfree() | |
bff431e4 CC |
610 | * |
611 | * Returns extra data associated with an event in WMI. | |
612 | */ | |
613 | acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out) | |
614 | { | |
615 | struct acpi_object_list input; | |
616 | union acpi_object params[1]; | |
617 | struct guid_block *gblock; | |
618 | struct wmi_block *wblock; | |
bff431e4 CC |
619 | |
620 | input.count = 1; | |
621 | input.pointer = params; | |
622 | params[0].type = ACPI_TYPE_INTEGER; | |
623 | params[0].integer.value = event; | |
624 | ||
cedb3b2a | 625 | list_for_each_entry(wblock, &wmi_block_list, list) { |
bff431e4 CC |
626 | gblock = &wblock->gblock; |
627 | ||
628 | if ((gblock->flags & ACPI_WMI_EVENT) && | |
629 | (gblock->notify_id == event)) | |
b0e86302 AL |
630 | return acpi_evaluate_object(wblock->acpi_device->handle, |
631 | "_WED", &input, out); | |
bff431e4 CC |
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 | ||
e7488e58 YP |
650 | /** |
651 | * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID | |
652 | * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba | |
653 | * | |
654 | * Find the _UID of ACPI device associated with this WMI GUID. | |
655 | * | |
656 | * Return: The ACPI _UID field value or NULL if the WMI GUID was not found | |
657 | */ | |
658 | char *wmi_get_acpi_device_uid(const char *guid_string) | |
659 | { | |
660 | struct wmi_block *wblock = NULL; | |
661 | ||
662 | if (!find_guid(guid_string, &wblock)) | |
663 | return NULL; | |
664 | ||
665 | return acpi_device_uid(wblock->acpi_device); | |
666 | } | |
667 | EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid); | |
668 | ||
844af950 AL |
669 | static struct wmi_block *dev_to_wblock(struct device *dev) |
670 | { | |
671 | return container_of(dev, struct wmi_block, dev.dev); | |
672 | } | |
673 | ||
674 | static struct wmi_device *dev_to_wdev(struct device *dev) | |
675 | { | |
676 | return container_of(dev, struct wmi_device, dev); | |
677 | } | |
678 | ||
1caab3c1 MG |
679 | /* |
680 | * sysfs interface | |
681 | */ | |
614ef432 | 682 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1caab3c1 MG |
683 | char *buf) |
684 | { | |
844af950 | 685 | struct wmi_block *wblock = dev_to_wblock(dev); |
1caab3c1 | 686 | |
85b4e4eb | 687 | return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid); |
1caab3c1 | 688 | } |
e80b89a5 | 689 | static DEVICE_ATTR_RO(modalias); |
614ef432 | 690 | |
844af950 AL |
691 | static ssize_t guid_show(struct device *dev, struct device_attribute *attr, |
692 | char *buf) | |
693 | { | |
694 | struct wmi_block *wblock = dev_to_wblock(dev); | |
695 | ||
696 | return sprintf(buf, "%pUL\n", wblock->gblock.guid); | |
697 | } | |
698 | static DEVICE_ATTR_RO(guid); | |
699 | ||
d79b1074 AL |
700 | static ssize_t instance_count_show(struct device *dev, |
701 | struct device_attribute *attr, char *buf) | |
702 | { | |
703 | struct wmi_block *wblock = dev_to_wblock(dev); | |
704 | ||
705 | return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count); | |
706 | } | |
707 | static DEVICE_ATTR_RO(instance_count); | |
708 | ||
709 | static ssize_t expensive_show(struct device *dev, | |
710 | struct device_attribute *attr, char *buf) | |
711 | { | |
712 | struct wmi_block *wblock = dev_to_wblock(dev); | |
713 | ||
714 | return sprintf(buf, "%d\n", | |
715 | (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0); | |
716 | } | |
717 | static DEVICE_ATTR_RO(expensive); | |
718 | ||
e80b89a5 GKH |
719 | static struct attribute *wmi_attrs[] = { |
720 | &dev_attr_modalias.attr, | |
844af950 | 721 | &dev_attr_guid.attr, |
d79b1074 AL |
722 | &dev_attr_instance_count.attr, |
723 | &dev_attr_expensive.attr, | |
e80b89a5 | 724 | NULL, |
614ef432 | 725 | }; |
e80b89a5 | 726 | ATTRIBUTE_GROUPS(wmi); |
1caab3c1 | 727 | |
d79b1074 AL |
728 | static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr, |
729 | char *buf) | |
730 | { | |
731 | struct wmi_block *wblock = dev_to_wblock(dev); | |
732 | ||
733 | return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id); | |
734 | } | |
735 | static DEVICE_ATTR_RO(notify_id); | |
736 | ||
737 | static struct attribute *wmi_event_attrs[] = { | |
738 | &dev_attr_notify_id.attr, | |
739 | NULL, | |
740 | }; | |
741 | ATTRIBUTE_GROUPS(wmi_event); | |
742 | ||
743 | static ssize_t object_id_show(struct device *dev, struct device_attribute *attr, | |
744 | char *buf) | |
745 | { | |
746 | struct wmi_block *wblock = dev_to_wblock(dev); | |
747 | ||
748 | return sprintf(buf, "%c%c\n", wblock->gblock.object_id[0], | |
749 | wblock->gblock.object_id[1]); | |
750 | } | |
751 | static DEVICE_ATTR_RO(object_id); | |
752 | ||
fd70da6a DHV |
753 | static ssize_t setable_show(struct device *dev, struct device_attribute *attr, |
754 | char *buf) | |
d4fc91ad AL |
755 | { |
756 | struct wmi_device *wdev = dev_to_wdev(dev); | |
757 | ||
fd70da6a | 758 | return sprintf(buf, "%d\n", (int)wdev->setable); |
d4fc91ad | 759 | } |
fd70da6a | 760 | static DEVICE_ATTR_RO(setable); |
d4fc91ad AL |
761 | |
762 | static struct attribute *wmi_data_attrs[] = { | |
763 | &dev_attr_object_id.attr, | |
fd70da6a | 764 | &dev_attr_setable.attr, |
d4fc91ad AL |
765 | NULL, |
766 | }; | |
767 | ATTRIBUTE_GROUPS(wmi_data); | |
768 | ||
769 | static struct attribute *wmi_method_attrs[] = { | |
d79b1074 AL |
770 | &dev_attr_object_id.attr, |
771 | NULL, | |
772 | }; | |
d4fc91ad | 773 | ATTRIBUTE_GROUPS(wmi_method); |
d79b1074 | 774 | |
1caab3c1 MG |
775 | static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
776 | { | |
844af950 | 777 | struct wmi_block *wblock = dev_to_wblock(dev); |
1caab3c1 | 778 | |
844af950 | 779 | if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid)) |
1caab3c1 MG |
780 | return -ENOMEM; |
781 | ||
844af950 | 782 | if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid)) |
1caab3c1 MG |
783 | return -ENOMEM; |
784 | ||
844af950 AL |
785 | return 0; |
786 | } | |
787 | ||
788 | static void wmi_dev_release(struct device *dev) | |
789 | { | |
790 | struct wmi_block *wblock = dev_to_wblock(dev); | |
791 | ||
792 | kfree(wblock); | |
793 | } | |
794 | ||
795 | static int wmi_dev_match(struct device *dev, struct device_driver *driver) | |
796 | { | |
797 | struct wmi_driver *wmi_driver = | |
798 | container_of(driver, struct wmi_driver, driver); | |
799 | struct wmi_block *wblock = dev_to_wblock(dev); | |
800 | const struct wmi_device_id *id = wmi_driver->id_table; | |
1caab3c1 | 801 | |
c355ec65 MJ |
802 | if (id == NULL) |
803 | return 0; | |
804 | ||
eacc95ea | 805 | while (*id->guid_string) { |
f9dffc14 | 806 | guid_t driver_guid; |
844af950 | 807 | |
f9dffc14 | 808 | if (WARN_ON(guid_parse(id->guid_string, &driver_guid))) |
844af950 AL |
809 | continue; |
810 | if (!memcmp(&driver_guid, wblock->gblock.guid, 16)) | |
811 | return 1; | |
812 | ||
813 | id++; | |
814 | } | |
1caab3c1 MG |
815 | |
816 | return 0; | |
817 | } | |
44b6b766 ML |
818 | static int wmi_char_open(struct inode *inode, struct file *filp) |
819 | { | |
820 | const char *driver_name = filp->f_path.dentry->d_iname; | |
821 | struct wmi_block *wblock = NULL; | |
822 | struct wmi_block *next = NULL; | |
823 | ||
824 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { | |
825 | if (!wblock->dev.dev.driver) | |
826 | continue; | |
827 | if (strcmp(driver_name, wblock->dev.dev.driver->name) == 0) { | |
828 | filp->private_data = wblock; | |
829 | break; | |
830 | } | |
831 | } | |
832 | ||
833 | if (!filp->private_data) | |
834 | return -ENODEV; | |
835 | ||
836 | return nonseekable_open(inode, filp); | |
837 | } | |
838 | ||
839 | static ssize_t wmi_char_read(struct file *filp, char __user *buffer, | |
840 | size_t length, loff_t *offset) | |
841 | { | |
842 | struct wmi_block *wblock = filp->private_data; | |
843 | ||
844 | return simple_read_from_buffer(buffer, length, offset, | |
845 | &wblock->req_buf_size, | |
846 | sizeof(wblock->req_buf_size)); | |
847 | } | |
848 | ||
849 | static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
850 | { | |
851 | struct wmi_ioctl_buffer __user *input = | |
852 | (struct wmi_ioctl_buffer __user *) arg; | |
853 | struct wmi_block *wblock = filp->private_data; | |
854 | struct wmi_ioctl_buffer *buf = NULL; | |
855 | struct wmi_driver *wdriver = NULL; | |
856 | int ret; | |
857 | ||
858 | if (_IOC_TYPE(cmd) != WMI_IOC) | |
859 | return -ENOTTY; | |
860 | ||
861 | /* make sure we're not calling a higher instance than exists*/ | |
862 | if (_IOC_NR(cmd) >= wblock->gblock.instance_count) | |
863 | return -EINVAL; | |
864 | ||
865 | mutex_lock(&wblock->char_mutex); | |
866 | buf = wblock->handler_data; | |
867 | if (get_user(buf->length, &input->length)) { | |
868 | dev_dbg(&wblock->dev.dev, "Read length from user failed\n"); | |
869 | ret = -EFAULT; | |
870 | goto out_ioctl; | |
871 | } | |
872 | /* if it's too small, abort */ | |
873 | if (buf->length < wblock->req_buf_size) { | |
874 | dev_err(&wblock->dev.dev, | |
875 | "Buffer %lld too small, need at least %lld\n", | |
876 | buf->length, wblock->req_buf_size); | |
877 | ret = -EINVAL; | |
878 | goto out_ioctl; | |
879 | } | |
880 | /* if it's too big, warn, driver will only use what is needed */ | |
881 | if (buf->length > wblock->req_buf_size) | |
882 | dev_warn(&wblock->dev.dev, | |
883 | "Buffer %lld is bigger than required %lld\n", | |
884 | buf->length, wblock->req_buf_size); | |
885 | ||
886 | /* copy the structure from userspace */ | |
887 | if (copy_from_user(buf, input, wblock->req_buf_size)) { | |
888 | dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n", | |
889 | wblock->req_buf_size); | |
890 | ret = -EFAULT; | |
891 | goto out_ioctl; | |
892 | } | |
893 | ||
894 | /* let the driver do any filtering and do the call */ | |
895 | wdriver = container_of(wblock->dev.dev.driver, | |
896 | struct wmi_driver, driver); | |
5e3e2297 ML |
897 | if (!try_module_get(wdriver->driver.owner)) { |
898 | ret = -EBUSY; | |
899 | goto out_ioctl; | |
900 | } | |
44b6b766 ML |
901 | ret = wdriver->filter_callback(&wblock->dev, cmd, buf); |
902 | module_put(wdriver->driver.owner); | |
903 | if (ret) | |
904 | goto out_ioctl; | |
905 | ||
906 | /* return the result (only up to our internal buffer size) */ | |
907 | if (copy_to_user(input, buf, wblock->req_buf_size)) { | |
908 | dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n", | |
909 | wblock->req_buf_size); | |
910 | ret = -EFAULT; | |
911 | } | |
912 | ||
913 | out_ioctl: | |
914 | mutex_unlock(&wblock->char_mutex); | |
915 | return ret; | |
916 | } | |
917 | ||
918 | static const struct file_operations wmi_fops = { | |
919 | .owner = THIS_MODULE, | |
920 | .read = wmi_char_read, | |
921 | .open = wmi_char_open, | |
922 | .unlocked_ioctl = wmi_ioctl, | |
1832f2d8 | 923 | .compat_ioctl = compat_ptr_ioctl, |
44b6b766 | 924 | }; |
1caab3c1 | 925 | |
844af950 | 926 | static int wmi_dev_probe(struct device *dev) |
1caab3c1 | 927 | { |
844af950 AL |
928 | struct wmi_block *wblock = dev_to_wblock(dev); |
929 | struct wmi_driver *wdriver = | |
930 | container_of(dev->driver, struct wmi_driver, driver); | |
931 | int ret = 0; | |
44b6b766 | 932 | char *buf; |
844af950 AL |
933 | |
934 | if (ACPI_FAILURE(wmi_method_enable(wblock, 1))) | |
935 | dev_warn(dev, "failed to enable device -- probing anyway\n"); | |
936 | ||
937 | if (wdriver->probe) { | |
440c4983 MJ |
938 | ret = wdriver->probe(dev_to_wdev(dev), |
939 | find_guid_context(wblock, wdriver)); | |
44b6b766 ML |
940 | if (ret != 0) |
941 | goto probe_failure; | |
942 | } | |
943 | ||
944 | /* driver wants a character device made */ | |
945 | if (wdriver->filter_callback) { | |
946 | /* check that required buffer size declared by driver or MOF */ | |
947 | if (!wblock->req_buf_size) { | |
948 | dev_err(&wblock->dev.dev, | |
949 | "Required buffer size not set\n"); | |
950 | ret = -EINVAL; | |
951 | goto probe_failure; | |
952 | } | |
953 | ||
6fb74107 KC |
954 | wblock->handler_data = kmalloc(wblock->req_buf_size, |
955 | GFP_KERNEL); | |
44b6b766 ML |
956 | if (!wblock->handler_data) { |
957 | ret = -ENOMEM; | |
958 | goto probe_failure; | |
959 | } | |
960 | ||
7f166add | 961 | buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name); |
44b6b766 ML |
962 | if (!buf) { |
963 | ret = -ENOMEM; | |
964 | goto probe_string_failure; | |
965 | } | |
44b6b766 ML |
966 | wblock->char_dev.minor = MISC_DYNAMIC_MINOR; |
967 | wblock->char_dev.name = buf; | |
968 | wblock->char_dev.fops = &wmi_fops; | |
969 | wblock->char_dev.mode = 0444; | |
970 | ret = misc_register(&wblock->char_dev); | |
971 | if (ret) { | |
501f7e52 | 972 | dev_warn(dev, "failed to register char dev: %d\n", ret); |
44b6b766 ML |
973 | ret = -ENOMEM; |
974 | goto probe_misc_failure; | |
975 | } | |
844af950 AL |
976 | } |
977 | ||
44b6b766 ML |
978 | return 0; |
979 | ||
980 | probe_misc_failure: | |
981 | kfree(buf); | |
982 | probe_string_failure: | |
983 | kfree(wblock->handler_data); | |
984 | probe_failure: | |
985 | if (ACPI_FAILURE(wmi_method_enable(wblock, 0))) | |
986 | dev_warn(dev, "failed to disable device\n"); | |
844af950 AL |
987 | return ret; |
988 | } | |
989 | ||
fc7a6209 | 990 | static void wmi_dev_remove(struct device *dev) |
844af950 AL |
991 | { |
992 | struct wmi_block *wblock = dev_to_wblock(dev); | |
993 | struct wmi_driver *wdriver = | |
994 | container_of(dev->driver, struct wmi_driver, driver); | |
844af950 | 995 | |
44b6b766 ML |
996 | if (wdriver->filter_callback) { |
997 | misc_deregister(&wblock->char_dev); | |
998 | kfree(wblock->char_dev.name); | |
6fb74107 | 999 | kfree(wblock->handler_data); |
44b6b766 ML |
1000 | } |
1001 | ||
844af950 | 1002 | if (wdriver->remove) |
2b329f56 | 1003 | wdriver->remove(dev_to_wdev(dev)); |
844af950 AL |
1004 | |
1005 | if (ACPI_FAILURE(wmi_method_enable(wblock, 0))) | |
1006 | dev_warn(dev, "failed to disable device\n"); | |
1caab3c1 MG |
1007 | } |
1008 | ||
844af950 AL |
1009 | static struct class wmi_bus_class = { |
1010 | .name = "wmi_bus", | |
1011 | }; | |
1012 | ||
1013 | static struct bus_type wmi_bus_type = { | |
1caab3c1 | 1014 | .name = "wmi", |
e80b89a5 | 1015 | .dev_groups = wmi_groups, |
844af950 AL |
1016 | .match = wmi_dev_match, |
1017 | .uevent = wmi_dev_uevent, | |
1018 | .probe = wmi_dev_probe, | |
1019 | .remove = wmi_dev_remove, | |
1caab3c1 MG |
1020 | }; |
1021 | ||
69372c1d | 1022 | static const struct device_type wmi_type_event = { |
d79b1074 AL |
1023 | .name = "event", |
1024 | .groups = wmi_event_groups, | |
1025 | .release = wmi_dev_release, | |
1026 | }; | |
1027 | ||
69372c1d | 1028 | static const struct device_type wmi_type_method = { |
d79b1074 | 1029 | .name = "method", |
d4fc91ad | 1030 | .groups = wmi_method_groups, |
d79b1074 AL |
1031 | .release = wmi_dev_release, |
1032 | }; | |
1033 | ||
69372c1d | 1034 | static const struct device_type wmi_type_data = { |
d79b1074 | 1035 | .name = "data", |
d4fc91ad | 1036 | .groups = wmi_data_groups, |
d79b1074 AL |
1037 | .release = wmi_dev_release, |
1038 | }; | |
1039 | ||
fd70da6a | 1040 | static int wmi_create_device(struct device *wmi_bus_dev, |
844af950 | 1041 | const struct guid_block *gblock, |
7f5809bf AL |
1042 | struct wmi_block *wblock, |
1043 | struct acpi_device *device) | |
1caab3c1 | 1044 | { |
fd70da6a DHV |
1045 | struct acpi_device_info *info; |
1046 | char method[5]; | |
1047 | int result; | |
1caab3c1 | 1048 | |
d79b1074 AL |
1049 | if (gblock->flags & ACPI_WMI_EVENT) { |
1050 | wblock->dev.dev.type = &wmi_type_event; | |
fd70da6a DHV |
1051 | goto out_init; |
1052 | } | |
1053 | ||
1054 | if (gblock->flags & ACPI_WMI_METHOD) { | |
d79b1074 | 1055 | wblock->dev.dev.type = &wmi_type_method; |
44b6b766 | 1056 | mutex_init(&wblock->char_mutex); |
fd70da6a DHV |
1057 | goto out_init; |
1058 | } | |
d4fc91ad | 1059 | |
fd70da6a DHV |
1060 | /* |
1061 | * Data Block Query Control Method (WQxx by convention) is | |
1062 | * required per the WMI documentation. If it is not present, | |
1063 | * we ignore this data block. | |
1064 | */ | |
1065 | strcpy(method, "WQ"); | |
1066 | strncat(method, wblock->gblock.object_id, 2); | |
1067 | result = get_subobj_info(device->handle, method, &info); | |
1068 | ||
1069 | if (result) { | |
1070 | dev_warn(wmi_bus_dev, | |
501f7e52 | 1071 | "%s data block query control method not found\n", |
fd70da6a DHV |
1072 | method); |
1073 | return result; | |
1074 | } | |
d4fc91ad | 1075 | |
fd70da6a | 1076 | wblock->dev.dev.type = &wmi_type_data; |
d4fc91ad | 1077 | |
fd70da6a DHV |
1078 | /* |
1079 | * The Microsoft documentation specifically states: | |
1080 | * | |
1081 | * Data blocks registered with only a single instance | |
1082 | * can ignore the parameter. | |
1083 | * | |
1084 | * ACPICA will get mad at us if we call the method with the wrong number | |
1085 | * of arguments, so check what our method expects. (On some Dell | |
1086 | * laptops, WQxx may not be a method at all.) | |
1087 | */ | |
1088 | if (info->type != ACPI_TYPE_METHOD || info->param_count == 0) | |
1089 | wblock->read_takes_no_args = true; | |
d4fc91ad | 1090 | |
fd70da6a | 1091 | kfree(info); |
d4fc91ad | 1092 | |
fd70da6a DHV |
1093 | strcpy(method, "WS"); |
1094 | strncat(method, wblock->gblock.object_id, 2); | |
1095 | result = get_subobj_info(device->handle, method, NULL); | |
d4fc91ad | 1096 | |
fd70da6a DHV |
1097 | if (result == 0) |
1098 | wblock->dev.setable = true; | |
d4fc91ad | 1099 | |
fd70da6a DHV |
1100 | out_init: |
1101 | wblock->dev.dev.bus = &wmi_bus_type; | |
1102 | wblock->dev.dev.parent = wmi_bus_dev; | |
d4fc91ad | 1103 | |
fd70da6a | 1104 | dev_set_name(&wblock->dev.dev, "%pUL", gblock->guid); |
1caab3c1 | 1105 | |
6ee50aaa | 1106 | device_initialize(&wblock->dev.dev); |
fd70da6a DHV |
1107 | |
1108 | return 0; | |
1caab3c1 MG |
1109 | } |
1110 | ||
b0e86302 | 1111 | static void wmi_free_devices(struct acpi_device *device) |
1caab3c1 | 1112 | { |
c64eefd4 | 1113 | struct wmi_block *wblock, *next; |
1caab3c1 MG |
1114 | |
1115 | /* Delete devices for all the GUIDs */ | |
023b9565 | 1116 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { |
b0e86302 AL |
1117 | if (wblock->acpi_device == device) { |
1118 | list_del(&wblock->list); | |
6ee50aaa | 1119 | device_unregister(&wblock->dev.dev); |
b0e86302 | 1120 | } |
023b9565 | 1121 | } |
1caab3c1 MG |
1122 | } |
1123 | ||
6701cc8f | 1124 | static bool guid_already_parsed(struct acpi_device *device, const u8 *guid) |
d1f9e497 | 1125 | { |
d1f9e497 | 1126 | struct wmi_block *wblock; |
d1f9e497 | 1127 | |
b0e86302 AL |
1128 | list_for_each_entry(wblock, &wmi_block_list, list) { |
1129 | if (memcmp(wblock->gblock.guid, guid, 16) == 0) { | |
1130 | /* | |
1131 | * Because we historically didn't track the relationship | |
1132 | * between GUIDs and ACPI nodes, we don't know whether | |
1133 | * we need to suppress GUIDs that are unique on a | |
1134 | * given node but duplicated across nodes. | |
1135 | */ | |
1136 | dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n", | |
1137 | guid, dev_name(&wblock->acpi_device->dev)); | |
d1f9e497 | 1138 | return true; |
b0e86302 AL |
1139 | } |
1140 | } | |
d1f9e497 | 1141 | |
c64eefd4 | 1142 | return false; |
2d5ab555 DT |
1143 | } |
1144 | ||
bff431e4 CC |
1145 | /* |
1146 | * Parse the _WDG method for the GUID data blocks | |
1147 | */ | |
844af950 | 1148 | static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device) |
bff431e4 CC |
1149 | { |
1150 | struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; | |
37830662 | 1151 | const struct guid_block *gblock; |
6ee50aaa DHV |
1152 | struct wmi_block *wblock, *next; |
1153 | union acpi_object *obj; | |
bff431e4 | 1154 | acpi_status status; |
6ee50aaa | 1155 | int retval = 0; |
bff431e4 CC |
1156 | u32 i, total; |
1157 | ||
7f5809bf | 1158 | status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out); |
bff431e4 | 1159 | if (ACPI_FAILURE(status)) |
c64eefd4 | 1160 | return -ENXIO; |
bff431e4 CC |
1161 | |
1162 | obj = (union acpi_object *) out.pointer; | |
3d2c63eb | 1163 | if (!obj) |
c64eefd4 | 1164 | return -ENXIO; |
bff431e4 | 1165 | |
64ed0ab8 | 1166 | if (obj->type != ACPI_TYPE_BUFFER) { |
c64eefd4 | 1167 | retval = -ENXIO; |
64ed0ab8 DT |
1168 | goto out_free_pointer; |
1169 | } | |
bff431e4 | 1170 | |
37830662 | 1171 | gblock = (const struct guid_block *)obj->buffer.pointer; |
bff431e4 CC |
1172 | total = obj->buffer.length / sizeof(struct guid_block); |
1173 | ||
bff431e4 | 1174 | for (i = 0; i < total; i++) { |
58f6425e CK |
1175 | if (debug_dump_wdg) |
1176 | wmi_dump_wdg(&gblock[i]); | |
1177 | ||
a1c31bcd AL |
1178 | /* |
1179 | * Some WMI devices, like those for nVidia hooks, have a | |
1180 | * duplicate GUID. It's not clear what we should do in this | |
1181 | * case yet, so for now, we'll just ignore the duplicate | |
1182 | * for device creation. | |
1183 | */ | |
1184 | if (guid_already_parsed(device, gblock[i].guid)) | |
1185 | continue; | |
1186 | ||
58f6425e | 1187 | wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); |
6ee50aaa DHV |
1188 | if (!wblock) { |
1189 | retval = -ENOMEM; | |
1190 | break; | |
1191 | } | |
58f6425e | 1192 | |
b0e86302 | 1193 | wblock->acpi_device = device; |
58f6425e CK |
1194 | wblock->gblock = gblock[i]; |
1195 | ||
fd70da6a DHV |
1196 | retval = wmi_create_device(wmi_bus_dev, &gblock[i], wblock, device); |
1197 | if (retval) { | |
1198 | kfree(wblock); | |
1199 | continue; | |
1200 | } | |
c64eefd4 | 1201 | |
58f6425e | 1202 | list_add_tail(&wblock->list, &wmi_block_list); |
bff431e4 | 1203 | |
fc3155b2 TR |
1204 | if (debug_event) { |
1205 | wblock->handler = wmi_notify_debug; | |
2d5ab555 | 1206 | wmi_method_enable(wblock, 1); |
fc3155b2 | 1207 | } |
bff431e4 CC |
1208 | } |
1209 | ||
6ee50aaa DHV |
1210 | /* |
1211 | * Now that all of the devices are created, add them to the | |
1212 | * device tree and probe subdrivers. | |
1213 | */ | |
1214 | list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { | |
1215 | if (wblock->acpi_device != device) | |
1216 | continue; | |
1217 | ||
1218 | retval = device_add(&wblock->dev.dev); | |
1219 | if (retval) { | |
501f7e52 | 1220 | dev_err(wmi_bus_dev, "failed to register %pUL\n", |
6ee50aaa DHV |
1221 | wblock->gblock.guid); |
1222 | if (debug_event) | |
1223 | wmi_method_enable(wblock, 0); | |
1224 | list_del(&wblock->list); | |
1225 | put_device(&wblock->dev.dev); | |
1226 | } | |
1227 | } | |
c64eefd4 | 1228 | |
a5167c5b AL |
1229 | out_free_pointer: |
1230 | kfree(out.pointer); | |
c64eefd4 | 1231 | return retval; |
bff431e4 CC |
1232 | } |
1233 | ||
1234 | /* | |
1235 | * WMI can have EmbeddedControl access regions. In which case, we just want to | |
1236 | * hand these off to the EC driver. | |
1237 | */ | |
1238 | static acpi_status | |
1239 | acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address, | |
439913ff | 1240 | u32 bits, u64 *value, |
bff431e4 CC |
1241 | void *handler_context, void *region_context) |
1242 | { | |
1243 | int result = 0, i = 0; | |
1244 | u8 temp = 0; | |
1245 | ||
1246 | if ((address > 0xFF) || !value) | |
1247 | return AE_BAD_PARAMETER; | |
1248 | ||
1249 | if (function != ACPI_READ && function != ACPI_WRITE) | |
1250 | return AE_BAD_PARAMETER; | |
1251 | ||
1252 | if (bits != 8) | |
1253 | return AE_BAD_PARAMETER; | |
1254 | ||
1255 | if (function == ACPI_READ) { | |
1256 | result = ec_read(address, &temp); | |
439913ff | 1257 | (*value) |= ((u64)temp) << i; |
bff431e4 CC |
1258 | } else { |
1259 | temp = 0xff & ((*value) >> i); | |
1260 | result = ec_write(address, temp); | |
1261 | } | |
1262 | ||
1263 | switch (result) { | |
1264 | case -EINVAL: | |
1265 | return AE_BAD_PARAMETER; | |
bff431e4 CC |
1266 | case -ENODEV: |
1267 | return AE_NOT_FOUND; | |
bff431e4 CC |
1268 | case -ETIME: |
1269 | return AE_TIME; | |
bff431e4 CC |
1270 | default: |
1271 | return AE_OK; | |
1272 | } | |
1273 | } | |
1274 | ||
1686f544 AL |
1275 | static void acpi_wmi_notify_handler(acpi_handle handle, u32 event, |
1276 | void *context) | |
bff431e4 CC |
1277 | { |
1278 | struct guid_block *block; | |
1279 | struct wmi_block *wblock; | |
1686f544 | 1280 | bool found_it = false; |
bff431e4 | 1281 | |
cedb3b2a | 1282 | list_for_each_entry(wblock, &wmi_block_list, list) { |
bff431e4 CC |
1283 | block = &wblock->gblock; |
1284 | ||
1686f544 | 1285 | if (wblock->acpi_device->handle == handle && |
b0e86302 | 1286 | (block->flags & ACPI_WMI_EVENT) && |
1686f544 AL |
1287 | (block->notify_id == event)) |
1288 | { | |
1289 | found_it = true; | |
bff431e4 CC |
1290 | break; |
1291 | } | |
1292 | } | |
1686f544 AL |
1293 | |
1294 | if (!found_it) | |
1295 | return; | |
1296 | ||
1297 | /* If a driver is bound, then notify the driver. */ | |
1298 | if (wblock->dev.dev.driver) { | |
1299 | struct wmi_driver *driver; | |
1300 | struct acpi_object_list input; | |
1301 | union acpi_object params[1]; | |
1302 | struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL }; | |
1303 | acpi_status status; | |
1304 | ||
1305 | driver = container_of(wblock->dev.dev.driver, | |
1306 | struct wmi_driver, driver); | |
1307 | ||
1308 | input.count = 1; | |
1309 | input.pointer = params; | |
1310 | params[0].type = ACPI_TYPE_INTEGER; | |
1311 | params[0].integer.value = event; | |
1312 | ||
1313 | status = acpi_evaluate_object(wblock->acpi_device->handle, | |
1314 | "_WED", &input, &evdata); | |
1315 | if (ACPI_FAILURE(status)) { | |
1316 | dev_warn(&wblock->dev.dev, | |
1317 | "failed to get event data\n"); | |
1318 | return; | |
1319 | } | |
1320 | ||
1321 | if (driver->notify) | |
1322 | driver->notify(&wblock->dev, | |
1323 | (union acpi_object *)evdata.pointer); | |
1324 | ||
1325 | kfree(evdata.pointer); | |
1326 | } else if (wblock->handler) { | |
1327 | /* Legacy handler */ | |
1328 | wblock->handler(event, wblock->handler_data); | |
1329 | } | |
1330 | ||
6701cc8f AS |
1331 | if (debug_event) |
1332 | pr_info("DEBUG Event GUID: %pUL\n", wblock->gblock.guid); | |
1686f544 AL |
1333 | |
1334 | acpi_bus_generate_netlink_event( | |
1335 | wblock->acpi_device->pnp.device_class, | |
1336 | dev_name(&wblock->dev.dev), | |
1337 | event, 0); | |
1338 | ||
bff431e4 CC |
1339 | } |
1340 | ||
9599ed91 | 1341 | static int acpi_wmi_remove(struct platform_device *device) |
bff431e4 | 1342 | { |
9599ed91 AL |
1343 | struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev); |
1344 | ||
1345 | acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY, | |
1686f544 | 1346 | acpi_wmi_notify_handler); |
9599ed91 | 1347 | acpi_remove_address_space_handler(acpi_device->handle, |
bff431e4 | 1348 | ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); |
9599ed91 | 1349 | wmi_free_devices(acpi_device); |
56afb8d4 | 1350 | device_unregister((struct device *)dev_get_drvdata(&device->dev)); |
bff431e4 CC |
1351 | |
1352 | return 0; | |
1353 | } | |
1354 | ||
9599ed91 | 1355 | static int acpi_wmi_probe(struct platform_device *device) |
bff431e4 | 1356 | { |
9599ed91 | 1357 | struct acpi_device *acpi_device; |
844af950 | 1358 | struct device *wmi_bus_dev; |
bff431e4 | 1359 | acpi_status status; |
c64eefd4 | 1360 | int error; |
bff431e4 | 1361 | |
9599ed91 AL |
1362 | acpi_device = ACPI_COMPANION(&device->dev); |
1363 | if (!acpi_device) { | |
1364 | dev_err(&device->dev, "ACPI companion is missing\n"); | |
1365 | return -ENODEV; | |
1366 | } | |
1367 | ||
1368 | status = acpi_install_address_space_handler(acpi_device->handle, | |
bff431e4 CC |
1369 | ACPI_ADR_SPACE_EC, |
1370 | &acpi_wmi_ec_space_handler, | |
1371 | NULL, NULL); | |
5212cd67 | 1372 | if (ACPI_FAILURE(status)) { |
46492ee4 | 1373 | dev_err(&device->dev, "Error installing EC region handler\n"); |
bff431e4 | 1374 | return -ENODEV; |
5212cd67 | 1375 | } |
bff431e4 | 1376 | |
9599ed91 AL |
1377 | status = acpi_install_notify_handler(acpi_device->handle, |
1378 | ACPI_DEVICE_NOTIFY, | |
1686f544 AL |
1379 | acpi_wmi_notify_handler, |
1380 | NULL); | |
1381 | if (ACPI_FAILURE(status)) { | |
1382 | dev_err(&device->dev, "Error installing notify handler\n"); | |
1383 | error = -ENODEV; | |
1384 | goto err_remove_ec_handler; | |
1385 | } | |
1386 | ||
844af950 AL |
1387 | wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0), |
1388 | NULL, "wmi_bus-%s", dev_name(&device->dev)); | |
1389 | if (IS_ERR(wmi_bus_dev)) { | |
1390 | error = PTR_ERR(wmi_bus_dev); | |
1686f544 | 1391 | goto err_remove_notify_handler; |
844af950 | 1392 | } |
9599ed91 | 1393 | dev_set_drvdata(&device->dev, wmi_bus_dev); |
844af950 | 1394 | |
9599ed91 | 1395 | error = parse_wdg(wmi_bus_dev, acpi_device); |
c64eefd4 | 1396 | if (error) { |
8e07514d | 1397 | pr_err("Failed to parse WDG method\n"); |
844af950 | 1398 | goto err_remove_busdev; |
bff431e4 CC |
1399 | } |
1400 | ||
c64eefd4 | 1401 | return 0; |
46492ee4 | 1402 | |
844af950 | 1403 | err_remove_busdev: |
56afb8d4 | 1404 | device_unregister(wmi_bus_dev); |
844af950 | 1405 | |
1686f544 | 1406 | err_remove_notify_handler: |
9599ed91 | 1407 | acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY, |
1686f544 AL |
1408 | acpi_wmi_notify_handler); |
1409 | ||
1410 | err_remove_ec_handler: | |
9599ed91 | 1411 | acpi_remove_address_space_handler(acpi_device->handle, |
46492ee4 AL |
1412 | ACPI_ADR_SPACE_EC, |
1413 | &acpi_wmi_ec_space_handler); | |
1414 | ||
1415 | return error; | |
bff431e4 CC |
1416 | } |
1417 | ||
844af950 AL |
1418 | int __must_check __wmi_driver_register(struct wmi_driver *driver, |
1419 | struct module *owner) | |
1420 | { | |
1421 | driver->driver.owner = owner; | |
1422 | driver->driver.bus = &wmi_bus_type; | |
1423 | ||
1424 | return driver_register(&driver->driver); | |
1425 | } | |
1426 | EXPORT_SYMBOL(__wmi_driver_register); | |
1427 | ||
1428 | void wmi_driver_unregister(struct wmi_driver *driver) | |
1429 | { | |
1430 | driver_unregister(&driver->driver); | |
1431 | } | |
1432 | EXPORT_SYMBOL(wmi_driver_unregister); | |
1433 | ||
bff431e4 CC |
1434 | static int __init acpi_wmi_init(void) |
1435 | { | |
c64eefd4 | 1436 | int error; |
bff431e4 CC |
1437 | |
1438 | if (acpi_disabled) | |
1439 | return -ENODEV; | |
1440 | ||
844af950 | 1441 | error = class_register(&wmi_bus_class); |
c64eefd4 DT |
1442 | if (error) |
1443 | return error; | |
1caab3c1 | 1444 | |
844af950 AL |
1445 | error = bus_register(&wmi_bus_type); |
1446 | if (error) | |
1447 | goto err_unreg_class; | |
1448 | ||
9599ed91 | 1449 | error = platform_driver_register(&acpi_wmi_driver); |
c64eefd4 DT |
1450 | if (error) { |
1451 | pr_err("Error loading mapper\n"); | |
844af950 | 1452 | goto err_unreg_bus; |
bff431e4 CC |
1453 | } |
1454 | ||
8e07514d | 1455 | return 0; |
844af950 | 1456 | |
844af950 AL |
1457 | err_unreg_bus: |
1458 | bus_unregister(&wmi_bus_type); | |
1459 | ||
97277717 AK |
1460 | err_unreg_class: |
1461 | class_unregister(&wmi_bus_class); | |
1462 | ||
844af950 | 1463 | return error; |
bff431e4 CC |
1464 | } |
1465 | ||
1466 | static void __exit acpi_wmi_exit(void) | |
1467 | { | |
9599ed91 | 1468 | platform_driver_unregister(&acpi_wmi_driver); |
844af950 | 1469 | bus_unregister(&wmi_bus_type); |
303d1fcc | 1470 | class_unregister(&wmi_bus_class); |
bff431e4 CC |
1471 | } |
1472 | ||
98b8e4e5 | 1473 | subsys_initcall_sync(acpi_wmi_init); |
bff431e4 | 1474 | module_exit(acpi_wmi_exit); |