2 * ACPI-WMI mapping driver
4 * Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
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>
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/init.h>
34 #include <linux/types.h>
35 #include <linux/device.h>
36 #include <linux/list.h>
37 #include <linux/acpi.h>
38 #include <linux/slab.h>
39 #include <linux/module.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
43 ACPI_MODULE_NAME("wmi");
44 MODULE_AUTHOR("Carlos Corbacho");
45 MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
46 MODULE_LICENSE("GPL");
48 #define ACPI_WMI_CLASS "wmi"
50 static DEFINE_MUTEX(wmi_data_lock);
51 static LIST_HEAD(wmi_block_list);
58 unsigned char notify_id;
59 unsigned char reserved;
67 struct list_head list;
68 struct guid_block gblock;
70 wmi_notify_handler handler;
77 * If the GUID data block is marked as expensive, we must enable and
78 * explicitily disable data collection.
80 #define ACPI_WMI_EXPENSIVE 0x1
81 #define ACPI_WMI_METHOD 0x2 /* GUID is a method */
82 #define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
83 #define ACPI_WMI_EVENT 0x8 /* GUID is an event */
85 static bool debug_event;
86 module_param(debug_event, bool, 0444);
87 MODULE_PARM_DESC(debug_event,
88 "Log WMI Events [0/1]");
90 static bool debug_dump_wdg;
91 module_param(debug_dump_wdg, bool, 0444);
92 MODULE_PARM_DESC(debug_dump_wdg,
93 "Dump available WMI interfaces [0/1]");
95 static int acpi_wmi_remove(struct acpi_device *device);
96 static int acpi_wmi_add(struct acpi_device *device);
97 static void acpi_wmi_notify(struct acpi_device *device, u32 event);
99 static const struct acpi_device_id wmi_device_ids[] = {
104 MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
106 static struct acpi_driver acpi_wmi_driver = {
108 .class = ACPI_WMI_CLASS,
109 .ids = wmi_device_ids,
112 .remove = acpi_wmi_remove,
113 .notify = acpi_wmi_notify,
118 * GUID parsing functions
122 * wmi_parse_hexbyte - Convert a ASCII hex number to a byte
123 * @src: Pointer to at least 2 characters to convert.
125 * Convert a two character ASCII hex string to a number.
127 * Return: 0-255 Success, the byte was parsed correctly
128 * -1 Error, an invalid character was supplied
130 static int wmi_parse_hexbyte(const u8 *src)
136 h = value = hex_to_bin(src[0]);
141 value = hex_to_bin(src[1]);
143 return (h << 4) | value;
148 * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary
149 * @src: Memory block holding binary GUID (16 bytes)
150 * @dest: Memory block to hold byte swapped binary GUID (16 bytes)
152 * Byte swap a binary GUID to match it's real GUID value
154 static void wmi_swap_bytes(u8 *src, u8 *dest)
158 for (i = 0; i <= 3; i++)
159 memcpy(dest + i, src + (3 - i), 1);
161 for (i = 0; i <= 1; i++)
162 memcpy(dest + 4 + i, src + (5 - i), 1);
164 for (i = 0; i <= 1; i++)
165 memcpy(dest + 6 + i, src + (7 - i), 1);
167 memcpy(dest + 8, src + 8, 8);
171 * wmi_parse_guid - Convert GUID from ASCII to binary
172 * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
173 * @dest: Memory block to hold binary GUID (16 bytes)
175 * N.B. The GUID need not be NULL terminated.
177 * Return: 'true' @dest contains binary GUID
178 * 'false' @dest contents are undefined
180 static bool wmi_parse_guid(const u8 *src, u8 *dest)
182 static const int size[] = { 4, 2, 2, 2, 6 };
185 if (src[8] != '-' || src[13] != '-' ||
186 src[18] != '-' || src[23] != '-')
189 for (j = 0; j < 5; j++, src++) {
190 for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) {
191 v = wmi_parse_hexbyte(src);
201 * Convert a raw GUID to the ACII string representation
203 static int wmi_gtoa(const char *in, char *out)
207 for (i = 3; i >= 0; i--)
208 out += sprintf(out, "%02X", in[i] & 0xFF);
210 out += sprintf(out, "-");
211 out += sprintf(out, "%02X", in[5] & 0xFF);
212 out += sprintf(out, "%02X", in[4] & 0xFF);
213 out += sprintf(out, "-");
214 out += sprintf(out, "%02X", in[7] & 0xFF);
215 out += sprintf(out, "%02X", in[6] & 0xFF);
216 out += sprintf(out, "-");
217 out += sprintf(out, "%02X", in[8] & 0xFF);
218 out += sprintf(out, "%02X", in[9] & 0xFF);
219 out += sprintf(out, "-");
221 for (i = 10; i <= 15; i++)
222 out += sprintf(out, "%02X", in[i] & 0xFF);
228 static bool find_guid(const char *guid_string, struct wmi_block **out)
230 char tmp[16], guid_input[16];
231 struct wmi_block *wblock;
232 struct guid_block *block;
235 wmi_parse_guid(guid_string, tmp);
236 wmi_swap_bytes(tmp, guid_input);
238 list_for_each(p, &wmi_block_list) {
239 wblock = list_entry(p, struct wmi_block, list);
240 block = &wblock->gblock;
242 if (memcmp(block->guid, guid_input, 16) == 0) {
251 static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
253 struct guid_block *block = NULL;
258 block = &wblock->gblock;
259 handle = wblock->handle;
265 snprintf(method, 5, "WE%02X", block->notify_id);
266 status = acpi_execute_simple_method(handle, method, enable);
268 if (status != AE_OK && status != AE_NOT_FOUND)
275 * Exported WMI functions
278 * wmi_evaluate_method - Evaluate a WMI method
279 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
280 * @instance: Instance index
281 * @method_id: Method ID to call
282 * &in: Buffer containing input for the method call
283 * &out: Empty buffer to return the method results
285 * Call an ACPI-WMI method
287 acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
288 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
290 struct guid_block *block = NULL;
291 struct wmi_block *wblock = NULL;
294 struct acpi_object_list input;
295 union acpi_object params[3];
296 char method[5] = "WM";
298 if (!find_guid(guid_string, &wblock))
301 block = &wblock->gblock;
302 handle = wblock->handle;
304 if (!(block->flags & ACPI_WMI_METHOD))
307 if (block->instance_count < instance)
308 return AE_BAD_PARAMETER;
311 input.pointer = params;
312 params[0].type = ACPI_TYPE_INTEGER;
313 params[0].integer.value = instance;
314 params[1].type = ACPI_TYPE_INTEGER;
315 params[1].integer.value = method_id;
320 if (block->flags & ACPI_WMI_STRING) {
321 params[2].type = ACPI_TYPE_STRING;
323 params[2].type = ACPI_TYPE_BUFFER;
325 params[2].buffer.length = in->length;
326 params[2].buffer.pointer = in->pointer;
329 strncat(method, block->object_id, 2);
331 status = acpi_evaluate_object(handle, method, &input, out);
335 EXPORT_SYMBOL_GPL(wmi_evaluate_method);
338 * wmi_query_block - Return contents of a WMI block
339 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
340 * @instance: Instance index
341 * &out: Empty buffer to return the contents of the data block to
343 * Return the contents of an ACPI-WMI data block to a buffer
345 acpi_status wmi_query_block(const char *guid_string, u8 instance,
346 struct acpi_buffer *out)
348 struct guid_block *block = NULL;
349 struct wmi_block *wblock = NULL;
350 acpi_handle handle, wc_handle;
351 acpi_status status, wc_status = AE_ERROR;
352 struct acpi_object_list input;
353 union acpi_object wq_params[1];
355 char wc_method[5] = "WC";
357 if (!guid_string || !out)
358 return AE_BAD_PARAMETER;
360 if (!find_guid(guid_string, &wblock))
363 block = &wblock->gblock;
364 handle = wblock->handle;
366 if (block->instance_count < instance)
367 return AE_BAD_PARAMETER;
369 /* Check GUID is a data block */
370 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
374 input.pointer = wq_params;
375 wq_params[0].type = ACPI_TYPE_INTEGER;
376 wq_params[0].integer.value = instance;
379 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
382 if (block->flags & ACPI_WMI_EXPENSIVE) {
383 strncat(wc_method, block->object_id, 2);
386 * Some GUIDs break the specification by declaring themselves
387 * expensive, but have no corresponding WCxx method. So we
388 * should not fail if this happens.
390 wc_status = acpi_get_handle(handle, wc_method, &wc_handle);
391 if (ACPI_SUCCESS(wc_status))
392 wc_status = acpi_execute_simple_method(handle,
396 strcpy(method, "WQ");
397 strncat(method, block->object_id, 2);
399 status = acpi_evaluate_object(handle, method, &input, out);
402 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
403 * the WQxx method failed - we should disable collection anyway.
405 if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
406 status = acpi_execute_simple_method(handle, wc_method, 0);
411 EXPORT_SYMBOL_GPL(wmi_query_block);
414 * wmi_set_block - Write to a WMI block
415 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
416 * @instance: Instance index
417 * &in: Buffer containing new values for the data block
419 * Write the contents of the input buffer to an ACPI-WMI data block
421 acpi_status wmi_set_block(const char *guid_string, u8 instance,
422 const struct acpi_buffer *in)
424 struct guid_block *block = NULL;
425 struct wmi_block *wblock = NULL;
427 struct acpi_object_list input;
428 union acpi_object params[2];
429 char method[5] = "WS";
431 if (!guid_string || !in)
434 if (!find_guid(guid_string, &wblock))
437 block = &wblock->gblock;
438 handle = wblock->handle;
440 if (block->instance_count < instance)
441 return AE_BAD_PARAMETER;
443 /* Check GUID is a data block */
444 if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
448 input.pointer = params;
449 params[0].type = ACPI_TYPE_INTEGER;
450 params[0].integer.value = instance;
452 if (block->flags & ACPI_WMI_STRING) {
453 params[1].type = ACPI_TYPE_STRING;
455 params[1].type = ACPI_TYPE_BUFFER;
457 params[1].buffer.length = in->length;
458 params[1].buffer.pointer = in->pointer;
460 strncat(method, block->object_id, 2);
462 return acpi_evaluate_object(handle, method, &input, NULL);
464 EXPORT_SYMBOL_GPL(wmi_set_block);
466 static void wmi_dump_wdg(const struct guid_block *g)
468 char guid_string[37];
470 wmi_gtoa(g->guid, guid_string);
472 pr_info("%s:\n", guid_string);
473 pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]);
474 pr_info("\tnotify_id: %02X\n", g->notify_id);
475 pr_info("\treserved: %02X\n", g->reserved);
476 pr_info("\tinstance_count: %d\n", g->instance_count);
477 pr_info("\tflags: %#x", g->flags);
479 if (g->flags & ACPI_WMI_EXPENSIVE)
480 pr_cont(" ACPI_WMI_EXPENSIVE");
481 if (g->flags & ACPI_WMI_METHOD)
482 pr_cont(" ACPI_WMI_METHOD");
483 if (g->flags & ACPI_WMI_STRING)
484 pr_cont(" ACPI_WMI_STRING");
485 if (g->flags & ACPI_WMI_EVENT)
486 pr_cont(" ACPI_WMI_EVENT");
492 static void wmi_notify_debug(u32 value, void *context)
494 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
495 union acpi_object *obj;
498 status = wmi_get_event_data(value, &response);
499 if (status != AE_OK) {
500 pr_info("bad event status 0x%x\n", status);
504 obj = (union acpi_object *)response.pointer;
509 pr_info("DEBUG Event ");
511 case ACPI_TYPE_BUFFER:
512 pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
514 case ACPI_TYPE_STRING:
515 pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
517 case ACPI_TYPE_INTEGER:
518 pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
520 case ACPI_TYPE_PACKAGE:
521 pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
524 pr_cont("object type 0x%X\n", obj->type);
530 * wmi_install_notify_handler - Register handler for WMI events
531 * @handler: Function to handle notifications
532 * @data: Data to be returned to handler when event is fired
534 * Register a handler for events sent to the ACPI-WMI mapper device.
536 acpi_status wmi_install_notify_handler(const char *guid,
537 wmi_notify_handler handler, void *data)
539 struct wmi_block *block;
540 acpi_status status = AE_NOT_EXIST;
541 char tmp[16], guid_input[16];
544 if (!guid || !handler)
545 return AE_BAD_PARAMETER;
547 wmi_parse_guid(guid, tmp);
548 wmi_swap_bytes(tmp, guid_input);
550 list_for_each(p, &wmi_block_list) {
551 acpi_status wmi_status;
552 block = list_entry(p, struct wmi_block, list);
554 if (memcmp(block->gblock.guid, guid_input, 16) == 0) {
555 if (block->handler &&
556 block->handler != wmi_notify_debug)
557 return AE_ALREADY_ACQUIRED;
559 block->handler = handler;
560 block->handler_data = data;
562 wmi_status = wmi_method_enable(block, 1);
563 if ((wmi_status != AE_OK) ||
564 ((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
571 EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
574 * wmi_uninstall_notify_handler - Unregister handler for WMI events
576 * Unregister handler for events sent to the ACPI-WMI mapper device.
578 acpi_status wmi_remove_notify_handler(const char *guid)
580 struct wmi_block *block;
581 acpi_status status = AE_NOT_EXIST;
582 char tmp[16], guid_input[16];
586 return AE_BAD_PARAMETER;
588 wmi_parse_guid(guid, tmp);
589 wmi_swap_bytes(tmp, guid_input);
591 list_for_each(p, &wmi_block_list) {
592 acpi_status wmi_status;
593 block = list_entry(p, struct wmi_block, list);
595 if (memcmp(block->gblock.guid, guid_input, 16) == 0) {
596 if (!block->handler ||
597 block->handler == wmi_notify_debug)
598 return AE_NULL_ENTRY;
601 block->handler = wmi_notify_debug;
604 wmi_status = wmi_method_enable(block, 0);
605 block->handler = NULL;
606 block->handler_data = NULL;
607 if ((wmi_status != AE_OK) ||
608 ((wmi_status == AE_OK) &&
609 (status == AE_NOT_EXIST)))
617 EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
620 * wmi_get_event_data - Get WMI data associated with an event
622 * @event: Event to find
623 * @out: Buffer to hold event data. out->pointer should be freed with kfree()
625 * Returns extra data associated with an event in WMI.
627 acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
629 struct acpi_object_list input;
630 union acpi_object params[1];
631 struct guid_block *gblock;
632 struct wmi_block *wblock;
636 input.pointer = params;
637 params[0].type = ACPI_TYPE_INTEGER;
638 params[0].integer.value = event;
640 list_for_each(p, &wmi_block_list) {
641 wblock = list_entry(p, struct wmi_block, list);
642 gblock = &wblock->gblock;
644 if ((gblock->flags & ACPI_WMI_EVENT) &&
645 (gblock->notify_id == event))
646 return acpi_evaluate_object(wblock->handle, "_WED",
652 EXPORT_SYMBOL_GPL(wmi_get_event_data);
655 * wmi_has_guid - Check if a GUID is available
656 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
658 * Check if a given GUID is defined by _WDG
660 bool wmi_has_guid(const char *guid_string)
662 return find_guid(guid_string, NULL);
664 EXPORT_SYMBOL_GPL(wmi_has_guid);
669 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
672 char guid_string[37];
673 struct wmi_block *wblock;
675 wblock = dev_get_drvdata(dev);
679 wmi_gtoa(wblock->gblock.guid, guid_string);
681 return sprintf(buf, "wmi:%s\n", guid_string);
683 static DEVICE_ATTR_RO(modalias);
685 static struct attribute *wmi_attrs[] = {
686 &dev_attr_modalias.attr,
689 ATTRIBUTE_GROUPS(wmi);
691 static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
693 char guid_string[37];
695 struct wmi_block *wblock;
697 if (add_uevent_var(env, "MODALIAS="))
700 wblock = dev_get_drvdata(dev);
704 wmi_gtoa(wblock->gblock.guid, guid_string);
706 strcpy(&env->buf[env->buflen - 1], "wmi:");
707 memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36);
713 static void wmi_dev_free(struct device *dev)
715 struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev);
720 static struct class wmi_class = {
722 .dev_release = wmi_dev_free,
723 .dev_uevent = wmi_dev_uevent,
724 .dev_groups = wmi_groups,
727 static int wmi_create_device(const struct guid_block *gblock,
728 struct wmi_block *wblock, acpi_handle handle)
730 char guid_string[37];
732 wblock->dev.class = &wmi_class;
734 wmi_gtoa(gblock->guid, guid_string);
735 dev_set_name(&wblock->dev, "%s", guid_string);
737 dev_set_drvdata(&wblock->dev, wblock);
739 return device_register(&wblock->dev);
742 static void wmi_free_devices(void)
744 struct wmi_block *wblock, *next;
746 /* Delete devices for all the GUIDs */
747 list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
748 list_del(&wblock->list);
749 if (wblock->dev.class)
750 device_unregister(&wblock->dev);
756 static bool guid_already_parsed(const char *guid_string)
758 struct wmi_block *wblock;
760 list_for_each_entry(wblock, &wmi_block_list, list)
761 if (memcmp(wblock->gblock.guid, guid_string, 16) == 0)
768 * Parse the _WDG method for the GUID data blocks
770 static int parse_wdg(acpi_handle handle)
772 struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
773 union acpi_object *obj;
774 const struct guid_block *gblock;
775 struct wmi_block *wblock;
780 status = acpi_evaluate_object(handle, "_WDG", NULL, &out);
781 if (ACPI_FAILURE(status))
784 obj = (union acpi_object *) out.pointer;
788 if (obj->type != ACPI_TYPE_BUFFER) {
790 goto out_free_pointer;
793 gblock = (const struct guid_block *)obj->buffer.pointer;
794 total = obj->buffer.length / sizeof(struct guid_block);
796 for (i = 0; i < total; i++) {
798 wmi_dump_wdg(&gblock[i]);
800 wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
804 wblock->handle = handle;
805 wblock->gblock = gblock[i];
808 Some WMI devices, like those for nVidia hooks, have a
809 duplicate GUID. It's not clear what we should do in this
810 case yet, so for now, we'll just ignore the duplicate
813 if (!guid_already_parsed(gblock[i].guid)) {
814 retval = wmi_create_device(&gblock[i], wblock, handle);
817 goto out_free_pointer;
821 list_add_tail(&wblock->list, &wmi_block_list);
824 wblock->handler = wmi_notify_debug;
825 wmi_method_enable(wblock, 1);
838 * WMI can have EmbeddedControl access regions. In which case, we just want to
839 * hand these off to the EC driver.
842 acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
843 u32 bits, u64 *value,
844 void *handler_context, void *region_context)
846 int result = 0, i = 0;
849 if ((address > 0xFF) || !value)
850 return AE_BAD_PARAMETER;
852 if (function != ACPI_READ && function != ACPI_WRITE)
853 return AE_BAD_PARAMETER;
856 return AE_BAD_PARAMETER;
858 if (function == ACPI_READ) {
859 result = ec_read(address, &temp);
860 (*value) |= ((u64)temp) << i;
862 temp = 0xff & ((*value) >> i);
863 result = ec_write(address, temp);
868 return AE_BAD_PARAMETER;
881 static void acpi_wmi_notify(struct acpi_device *device, u32 event)
883 struct guid_block *block;
884 struct wmi_block *wblock;
886 char guid_string[37];
888 list_for_each(p, &wmi_block_list) {
889 wblock = list_entry(p, struct wmi_block, list);
890 block = &wblock->gblock;
892 if ((block->flags & ACPI_WMI_EVENT) &&
893 (block->notify_id == event)) {
895 wblock->handler(event, wblock->handler_data);
897 wmi_gtoa(wblock->gblock.guid, guid_string);
898 pr_info("DEBUG Event GUID: %s\n", guid_string);
901 acpi_bus_generate_netlink_event(
902 device->pnp.device_class, dev_name(&device->dev),
909 static int acpi_wmi_remove(struct acpi_device *device)
911 acpi_remove_address_space_handler(device->handle,
912 ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
918 static int acpi_wmi_add(struct acpi_device *device)
923 status = acpi_install_address_space_handler(device->handle,
925 &acpi_wmi_ec_space_handler,
927 if (ACPI_FAILURE(status)) {
928 pr_err("Error installing EC region handler\n");
932 error = parse_wdg(device->handle);
934 acpi_remove_address_space_handler(device->handle,
936 &acpi_wmi_ec_space_handler);
937 pr_err("Failed to parse WDG method\n");
944 static int __init acpi_wmi_init(void)
951 error = class_register(&wmi_class);
955 error = acpi_bus_register_driver(&acpi_wmi_driver);
957 pr_err("Error loading mapper\n");
958 class_unregister(&wmi_class);
962 pr_info("Mapper loaded\n");
966 static void __exit acpi_wmi_exit(void)
968 acpi_bus_unregister_driver(&acpi_wmi_driver);
969 class_unregister(&wmi_class);
971 pr_info("Mapper unloaded\n");
974 subsys_initcall(acpi_wmi_init);
975 module_exit(acpi_wmi_exit);