Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/drivers/platform/x86/wmi.c

  1 /*
  2  *  ACPI-WMI mapping driver
  3  *
  4  *  Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
  5  *
  6  *  GUID parsing code from ldm.c is:
  7  *   Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
  8  *   Copyright (c) 2001-2007 Anton Altaparmakov
  9  *   Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
 10  *
 11  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 12  *
 13  *  This program is free software; you can redistribute it and/or modify
 14  *  it under the terms of the GNU General Public License as published by
 15  *  the Free Software Foundation; either version 2 of the License, or (at
 16  *  your option) any later version.
 17  *
 18  *  This program is distributed in the hope that it will be useful, but
 19  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 21  *  General Public License for more details.
 22  *
 23  *  You should have received a copy of the GNU General Public License along
 24  *  with this program; if not, write to the Free Software Foundation, Inc.,
 25  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 26  *
 27  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 28  */
 29 
 30 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
 31 
 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 <linux/uuid.h>
 41 
 42 ACPI_MODULE_NAME("wmi");
 43 MODULE_AUTHOR("Carlos Corbacho");
 44 MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
 45 MODULE_LICENSE("GPL");
 46 
 47 #define ACPI_WMI_CLASS "wmi"
 48 
 49 static LIST_HEAD(wmi_block_list);
 50 
 51 struct guid_block {
 52         char guid[16];
 53         union {
 54                 char object_id[2];
 55                 struct {
 56                         unsigned char notify_id;
 57                         unsigned char reserved;
 58                 };
 59         };
 60         u8 instance_count;
 61         u8 flags;
 62 };
 63 
 64 struct wmi_block {
 65         struct list_head list;
 66         struct guid_block gblock;
 67         acpi_handle handle;
 68         wmi_notify_handler handler;
 69         void *handler_data;
 70         struct device dev;
 71 };
 72 
 73 
 74 /*
 75  * If the GUID data block is marked as expensive, we must enable and
 76  * explicitily disable data collection.
 77  */
 78 #define ACPI_WMI_EXPENSIVE   0x1
 79 #define ACPI_WMI_METHOD      0x2        /* GUID is a method */
 80 #define ACPI_WMI_STRING      0x4        /* GUID takes & returns a string */
 81 #define ACPI_WMI_EVENT       0x8        /* GUID is an event */
 82 
 83 static bool debug_event;
 84 module_param(debug_event, bool, 0444);
 85 MODULE_PARM_DESC(debug_event,
 86                  "Log WMI Events [0/1]");
 87 
 88 static bool debug_dump_wdg;
 89 module_param(debug_dump_wdg, bool, 0444);
 90 MODULE_PARM_DESC(debug_dump_wdg,
 91                  "Dump available WMI interfaces [0/1]");
 92 
 93 static int acpi_wmi_remove(struct acpi_device *device);
 94 static int acpi_wmi_add(struct acpi_device *device);
 95 static void acpi_wmi_notify(struct acpi_device *device, u32 event);
 96 
 97 static const struct acpi_device_id wmi_device_ids[] = {
 98         {"PNP0C14", 0},
 99         {"pnp0c14", 0},
100         {"", 0},
101 };
102 MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
103 
104 static struct acpi_driver acpi_wmi_driver = {
105         .name = "wmi",
106         .class = ACPI_WMI_CLASS,
107         .ids = wmi_device_ids,
108         .ops = {
109                 .add = acpi_wmi_add,
110                 .remove = acpi_wmi_remove,
111                 .notify = acpi_wmi_notify,
112         },
113 };
114 
115 /*
116  * GUID parsing functions
117  */
118 
119 static bool find_guid(const char *guid_string, struct wmi_block **out)
120 {
121         uuid_le guid_input;
122         struct wmi_block *wblock;
123         struct guid_block *block;
124         struct list_head *p;
125 
126         if (uuid_le_to_bin(guid_string, &guid_input))
127                 return false;
128 
129         list_for_each(p, &wmi_block_list) {
130                 wblock = list_entry(p, struct wmi_block, list);
131                 block = &wblock->gblock;
132 
133                 if (memcmp(block->guid, &guid_input, 16) == 0) {
134                         if (out)
135                                 *out = wblock;
136                         return true;
137                 }
138         }
139         return false;
140 }
141 
142 static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
143 {
144         struct guid_block *block = NULL;
145         char method[5];
146         acpi_status status;
147         acpi_handle handle;
148 
149         block = &wblock->gblock;
150         handle = wblock->handle;
151 
152         snprintf(method, 5, "WE%02X", block->notify_id);
153         status = acpi_execute_simple_method(handle, method, enable);
154 
155         if (status != AE_OK && status != AE_NOT_FOUND)
156                 return status;
157         else
158                 return AE_OK;
159 }
160 
161 /*
162  * Exported WMI functions
163  */
164 /**
165  * wmi_evaluate_method - Evaluate a WMI method
166  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
167  * @instance: Instance index
168  * @method_id: Method ID to call
169  * &in: Buffer containing input for the method call
170  * &out: Empty buffer to return the method results
171  *
172  * Call an ACPI-WMI method
173  */
174 acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
175 u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
176 {
177         struct guid_block *block = NULL;
178         struct wmi_block *wblock = NULL;
179         acpi_handle handle;
180         acpi_status status;
181         struct acpi_object_list input;
182         union acpi_object params[3];
183         char method[5] = "WM";
184 
185         if (!find_guid(guid_string, &wblock))
186                 return AE_ERROR;
187 
188         block = &wblock->gblock;
189         handle = wblock->handle;
190 
191         if (!(block->flags & ACPI_WMI_METHOD))
192                 return AE_BAD_DATA;
193 
194         if (block->instance_count < instance)
195                 return AE_BAD_PARAMETER;
196 
197         input.count = 2;
198         input.pointer = params;
199         params[0].type = ACPI_TYPE_INTEGER;
200         params[0].integer.value = instance;
201         params[1].type = ACPI_TYPE_INTEGER;
202         params[1].integer.value = method_id;
203 
204         if (in) {
205                 input.count = 3;
206 
207                 if (block->flags & ACPI_WMI_STRING) {
208                         params[2].type = ACPI_TYPE_STRING;
209                 } else {
210                         params[2].type = ACPI_TYPE_BUFFER;
211                 }
212                 params[2].buffer.length = in->length;
213                 params[2].buffer.pointer = in->pointer;
214         }
215 
216         strncat(method, block->object_id, 2);
217 
218         status = acpi_evaluate_object(handle, method, &input, out);
219 
220         return status;
221 }
222 EXPORT_SYMBOL_GPL(wmi_evaluate_method);
223 
224 /**
225  * wmi_query_block - Return contents of a WMI block
226  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
227  * @instance: Instance index
228  * &out: Empty buffer to return the contents of the data block to
229  *
230  * Return the contents of an ACPI-WMI data block to a buffer
231  */
232 acpi_status wmi_query_block(const char *guid_string, u8 instance,
233 struct acpi_buffer *out)
234 {
235         struct guid_block *block = NULL;
236         struct wmi_block *wblock = NULL;
237         acpi_handle handle;
238         acpi_status status, wc_status = AE_ERROR;
239         struct acpi_object_list input;
240         union acpi_object wq_params[1];
241         char method[5];
242         char wc_method[5] = "WC";
243 
244         if (!guid_string || !out)
245                 return AE_BAD_PARAMETER;
246 
247         if (!find_guid(guid_string, &wblock))
248                 return AE_ERROR;
249 
250         block = &wblock->gblock;
251         handle = wblock->handle;
252 
253         if (block->instance_count < instance)
254                 return AE_BAD_PARAMETER;
255 
256         /* Check GUID is a data block */
257         if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
258                 return AE_ERROR;
259 
260         input.count = 1;
261         input.pointer = wq_params;
262         wq_params[0].type = ACPI_TYPE_INTEGER;
263         wq_params[0].integer.value = instance;
264 
265         /*
266          * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
267          * enable collection.
268          */
269         if (block->flags & ACPI_WMI_EXPENSIVE) {
270                 strncat(wc_method, block->object_id, 2);
271 
272                 /*
273                  * Some GUIDs break the specification by declaring themselves
274                  * expensive, but have no corresponding WCxx method. So we
275                  * should not fail if this happens.
276                  */
277                 if (acpi_has_method(handle, wc_method))
278                         wc_status = acpi_execute_simple_method(handle,
279                                                                 wc_method, 1);
280         }
281 
282         strcpy(method, "WQ");
283         strncat(method, block->object_id, 2);
284 
285         status = acpi_evaluate_object(handle, method, &input, out);
286 
287         /*
288          * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
289          * the WQxx method failed - we should disable collection anyway.
290          */
291         if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
292                 status = acpi_execute_simple_method(handle, wc_method, 0);
293         }
294 
295         return status;
296 }
297 EXPORT_SYMBOL_GPL(wmi_query_block);
298 
299 /**
300  * wmi_set_block - Write to a WMI block
301  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
302  * @instance: Instance index
303  * &in: Buffer containing new values for the data block
304  *
305  * Write the contents of the input buffer to an ACPI-WMI data block
306  */
307 acpi_status wmi_set_block(const char *guid_string, u8 instance,
308 const struct acpi_buffer *in)
309 {
310         struct guid_block *block = NULL;
311         struct wmi_block *wblock = NULL;
312         acpi_handle handle;
313         struct acpi_object_list input;
314         union acpi_object params[2];
315         char method[5] = "WS";
316 
317         if (!guid_string || !in)
318                 return AE_BAD_DATA;
319 
320         if (!find_guid(guid_string, &wblock))
321                 return AE_ERROR;
322 
323         block = &wblock->gblock;
324         handle = wblock->handle;
325 
326         if (block->instance_count < instance)
327                 return AE_BAD_PARAMETER;
328 
329         /* Check GUID is a data block */
330         if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
331                 return AE_ERROR;
332 
333         input.count = 2;
334         input.pointer = params;
335         params[0].type = ACPI_TYPE_INTEGER;
336         params[0].integer.value = instance;
337 
338         if (block->flags & ACPI_WMI_STRING) {
339                 params[1].type = ACPI_TYPE_STRING;
340         } else {
341                 params[1].type = ACPI_TYPE_BUFFER;
342         }
343         params[1].buffer.length = in->length;
344         params[1].buffer.pointer = in->pointer;
345 
346         strncat(method, block->object_id, 2);
347 
348         return acpi_evaluate_object(handle, method, &input, NULL);
349 }
350 EXPORT_SYMBOL_GPL(wmi_set_block);
351 
352 static void wmi_dump_wdg(const struct guid_block *g)
353 {
354         pr_info("%pUL:\n", g->guid);
355         pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]);
356         pr_info("\tnotify_id: %02X\n", g->notify_id);
357         pr_info("\treserved: %02X\n", g->reserved);
358         pr_info("\tinstance_count: %d\n", g->instance_count);
359         pr_info("\tflags: %#x", g->flags);
360         if (g->flags) {
361                 if (g->flags & ACPI_WMI_EXPENSIVE)
362                         pr_cont(" ACPI_WMI_EXPENSIVE");
363                 if (g->flags & ACPI_WMI_METHOD)
364                         pr_cont(" ACPI_WMI_METHOD");
365                 if (g->flags & ACPI_WMI_STRING)
366                         pr_cont(" ACPI_WMI_STRING");
367                 if (g->flags & ACPI_WMI_EVENT)
368                         pr_cont(" ACPI_WMI_EVENT");
369         }
370         pr_cont("\n");
371 
372 }
373 
374 static void wmi_notify_debug(u32 value, void *context)
375 {
376         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
377         union acpi_object *obj;
378         acpi_status status;
379 
380         status = wmi_get_event_data(value, &response);
381         if (status != AE_OK) {
382                 pr_info("bad event status 0x%x\n", status);
383                 return;
384         }
385 
386         obj = (union acpi_object *)response.pointer;
387 
388         if (!obj)
389                 return;
390 
391         pr_info("DEBUG Event ");
392         switch(obj->type) {
393         case ACPI_TYPE_BUFFER:
394                 pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
395                 break;
396         case ACPI_TYPE_STRING:
397                 pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
398                 break;
399         case ACPI_TYPE_INTEGER:
400                 pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
401                 break;
402         case ACPI_TYPE_PACKAGE:
403                 pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
404                 break;
405         default:
406                 pr_cont("object type 0x%X\n", obj->type);
407         }
408         kfree(obj);
409 }
410 
411 /**
412  * wmi_install_notify_handler - Register handler for WMI events
413  * @handler: Function to handle notifications
414  * @data: Data to be returned to handler when event is fired
415  *
416  * Register a handler for events sent to the ACPI-WMI mapper device.
417  */
418 acpi_status wmi_install_notify_handler(const char *guid,
419 wmi_notify_handler handler, void *data)
420 {
421         struct wmi_block *block;
422         acpi_status status = AE_NOT_EXIST;
423         uuid_le guid_input;
424         struct list_head *p;
425 
426         if (!guid || !handler)
427                 return AE_BAD_PARAMETER;
428 
429         if (uuid_le_to_bin(guid, &guid_input))
430                 return AE_BAD_PARAMETER;
431 
432         list_for_each(p, &wmi_block_list) {
433                 acpi_status wmi_status;
434                 block = list_entry(p, struct wmi_block, list);
435 
436                 if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
437                         if (block->handler &&
438                             block->handler != wmi_notify_debug)
439                                 return AE_ALREADY_ACQUIRED;
440 
441                         block->handler = handler;
442                         block->handler_data = data;
443 
444                         wmi_status = wmi_method_enable(block, 1);
445                         if ((wmi_status != AE_OK) ||
446                             ((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
447                                 status = wmi_status;
448                 }
449         }
450 
451         return status;
452 }
453 EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
454 
455 /**
456  * wmi_uninstall_notify_handler - Unregister handler for WMI events
457  *
458  * Unregister handler for events sent to the ACPI-WMI mapper device.
459  */
460 acpi_status wmi_remove_notify_handler(const char *guid)
461 {
462         struct wmi_block *block;
463         acpi_status status = AE_NOT_EXIST;
464         uuid_le guid_input;
465         struct list_head *p;
466 
467         if (!guid)
468                 return AE_BAD_PARAMETER;
469 
470         if (uuid_le_to_bin(guid, &guid_input))
471                 return AE_BAD_PARAMETER;
472 
473         list_for_each(p, &wmi_block_list) {
474                 acpi_status wmi_status;
475                 block = list_entry(p, struct wmi_block, list);
476 
477                 if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
478                         if (!block->handler ||
479                             block->handler == wmi_notify_debug)
480                                 return AE_NULL_ENTRY;
481 
482                         if (debug_event) {
483                                 block->handler = wmi_notify_debug;
484                                 status = AE_OK;
485                         } else {
486                                 wmi_status = wmi_method_enable(block, 0);
487                                 block->handler = NULL;
488                                 block->handler_data = NULL;
489                                 if ((wmi_status != AE_OK) ||
490                                     ((wmi_status == AE_OK) &&
491                                      (status == AE_NOT_EXIST)))
492                                         status = wmi_status;
493                         }
494                 }
495         }
496 
497         return status;
498 }
499 EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
500 
501 /**
502  * wmi_get_event_data - Get WMI data associated with an event
503  *
504  * @event: Event to find
505  * @out: Buffer to hold event data. out->pointer should be freed with kfree()
506  *
507  * Returns extra data associated with an event in WMI.
508  */
509 acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
510 {
511         struct acpi_object_list input;
512         union acpi_object params[1];
513         struct guid_block *gblock;
514         struct wmi_block *wblock;
515         struct list_head *p;
516 
517         input.count = 1;
518         input.pointer = params;
519         params[0].type = ACPI_TYPE_INTEGER;
520         params[0].integer.value = event;
521 
522         list_for_each(p, &wmi_block_list) {
523                 wblock = list_entry(p, struct wmi_block, list);
524                 gblock = &wblock->gblock;
525 
526                 if ((gblock->flags & ACPI_WMI_EVENT) &&
527                         (gblock->notify_id == event))
528                         return acpi_evaluate_object(wblock->handle, "_WED",
529                                 &input, out);
530         }
531 
532         return AE_NOT_FOUND;
533 }
534 EXPORT_SYMBOL_GPL(wmi_get_event_data);
535 
536 /**
537  * wmi_has_guid - Check if a GUID is available
538  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
539  *
540  * Check if a given GUID is defined by _WDG
541  */
542 bool wmi_has_guid(const char *guid_string)
543 {
544         return find_guid(guid_string, NULL);
545 }
546 EXPORT_SYMBOL_GPL(wmi_has_guid);
547 
548 /*
549  * sysfs interface
550  */
551 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
552                              char *buf)
553 {
554         struct wmi_block *wblock;
555 
556         wblock = dev_get_drvdata(dev);
557         if (!wblock) {
558                 strcat(buf, "\n");
559                 return strlen(buf);
560         }
561 
562         return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid);
563 }
564 static DEVICE_ATTR_RO(modalias);
565 
566 static struct attribute *wmi_attrs[] = {
567         &dev_attr_modalias.attr,
568         NULL,
569 };
570 ATTRIBUTE_GROUPS(wmi);
571 
572 static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
573 {
574         char guid_string[37];
575 
576         struct wmi_block *wblock;
577 
578         if (add_uevent_var(env, "MODALIAS="))
579                 return -ENOMEM;
580 
581         wblock = dev_get_drvdata(dev);
582         if (!wblock)
583                 return -ENOMEM;
584 
585         sprintf(guid_string, "%pUL", wblock->gblock.guid);
586 
587         strcpy(&env->buf[env->buflen - 1], "wmi:");
588         memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36);
589         env->buflen += 40;
590 
591         return 0;
592 }
593 
594 static void wmi_dev_free(struct device *dev)
595 {
596         struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev);
597 
598         kfree(wmi_block);
599 }
600 
601 static struct class wmi_class = {
602         .name = "wmi",
603         .dev_release = wmi_dev_free,
604         .dev_uevent = wmi_dev_uevent,
605         .dev_groups = wmi_groups,
606 };
607 
608 static int wmi_create_device(const struct guid_block *gblock,
609                              struct wmi_block *wblock, acpi_handle handle)
610 {
611         wblock->dev.class = &wmi_class;
612 
613         dev_set_name(&wblock->dev, "%pUL", gblock->guid);
614 
615         dev_set_drvdata(&wblock->dev, wblock);
616 
617         return device_register(&wblock->dev);
618 }
619 
620 static void wmi_free_devices(void)
621 {
622         struct wmi_block *wblock, *next;
623 
624         /* Delete devices for all the GUIDs */
625         list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
626                 list_del(&wblock->list);
627                 if (wblock->dev.class)
628                         device_unregister(&wblock->dev);
629                 else
630                         kfree(wblock);
631         }
632 }
633 
634 static bool guid_already_parsed(const char *guid_string)
635 {
636         struct wmi_block *wblock;
637 
638         list_for_each_entry(wblock, &wmi_block_list, list)
639                 if (memcmp(wblock->gblock.guid, guid_string, 16) == 0)
640                         return true;
641 
642         return false;
643 }
644 
645 /*
646  * Parse the _WDG method for the GUID data blocks
647  */
648 static int parse_wdg(acpi_handle handle)
649 {
650         struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
651         union acpi_object *obj;
652         const struct guid_block *gblock;
653         struct wmi_block *wblock;
654         acpi_status status;
655         int retval;
656         u32 i, total;
657 
658         status = acpi_evaluate_object(handle, "_WDG", NULL, &out);
659         if (ACPI_FAILURE(status))
660                 return -ENXIO;
661 
662         obj = (union acpi_object *) out.pointer;
663         if (!obj)
664                 return -ENXIO;
665 
666         if (obj->type != ACPI_TYPE_BUFFER) {
667                 retval = -ENXIO;
668                 goto out_free_pointer;
669         }
670 
671         gblock = (const struct guid_block *)obj->buffer.pointer;
672         total = obj->buffer.length / sizeof(struct guid_block);
673 
674         for (i = 0; i < total; i++) {
675                 if (debug_dump_wdg)
676                         wmi_dump_wdg(&gblock[i]);
677 
678                 wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
679                 if (!wblock)
680                         return -ENOMEM;
681 
682                 wblock->handle = handle;
683                 wblock->gblock = gblock[i];
684 
685                 /*
686                   Some WMI devices, like those for nVidia hooks, have a
687                   duplicate GUID. It's not clear what we should do in this
688                   case yet, so for now, we'll just ignore the duplicate
689                   for device creation.
690                 */
691                 if (!guid_already_parsed(gblock[i].guid)) {
692                         retval = wmi_create_device(&gblock[i], wblock, handle);
693                         if (retval) {
694                                 wmi_free_devices();
695                                 goto out_free_pointer;
696                         }
697                 }
698 
699                 list_add_tail(&wblock->list, &wmi_block_list);
700 
701                 if (debug_event) {
702                         wblock->handler = wmi_notify_debug;
703                         wmi_method_enable(wblock, 1);
704                 }
705         }
706 
707         retval = 0;
708 
709 out_free_pointer:
710         kfree(out.pointer);
711 
712         return retval;
713 }
714 
715 /*
716  * WMI can have EmbeddedControl access regions. In which case, we just want to
717  * hand these off to the EC driver.
718  */
719 static acpi_status
720 acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
721                       u32 bits, u64 *value,
722                       void *handler_context, void *region_context)
723 {
724         int result = 0, i = 0;
725         u8 temp = 0;
726 
727         if ((address > 0xFF) || !value)
728                 return AE_BAD_PARAMETER;
729 
730         if (function != ACPI_READ && function != ACPI_WRITE)
731                 return AE_BAD_PARAMETER;
732 
733         if (bits != 8)
734                 return AE_BAD_PARAMETER;
735 
736         if (function == ACPI_READ) {
737                 result = ec_read(address, &temp);
738                 (*value) |= ((u64)temp) << i;
739         } else {
740                 temp = 0xff & ((*value) >> i);
741                 result = ec_write(address, temp);
742         }
743 
744         switch (result) {
745         case -EINVAL:
746                 return AE_BAD_PARAMETER;
747                 break;
748         case -ENODEV:
749                 return AE_NOT_FOUND;
750                 break;
751         case -ETIME:
752                 return AE_TIME;
753                 break;
754         default:
755                 return AE_OK;
756         }
757 }
758 
759 static void acpi_wmi_notify(struct acpi_device *device, u32 event)
760 {
761         struct guid_block *block;
762         struct wmi_block *wblock;
763         struct list_head *p;
764 
765         list_for_each(p, &wmi_block_list) {
766                 wblock = list_entry(p, struct wmi_block, list);
767                 block = &wblock->gblock;
768 
769                 if ((block->flags & ACPI_WMI_EVENT) &&
770                         (block->notify_id == event)) {
771                         if (wblock->handler)
772                                 wblock->handler(event, wblock->handler_data);
773                         if (debug_event) {
774                                 pr_info("DEBUG Event GUID: %pUL\n",
775                                         wblock->gblock.guid);
776                         }
777 
778                         acpi_bus_generate_netlink_event(
779                                 device->pnp.device_class, dev_name(&device->dev),
780                                 event, 0);
781                         break;
782                 }
783         }
784 }
785 
786 static int acpi_wmi_remove(struct acpi_device *device)
787 {
788         acpi_remove_address_space_handler(device->handle,
789                                 ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
790         wmi_free_devices();
791 
792         return 0;
793 }
794 
795 static int acpi_wmi_add(struct acpi_device *device)
796 {
797         acpi_status status;
798         int error;
799 
800         status = acpi_install_address_space_handler(device->handle,
801                                                     ACPI_ADR_SPACE_EC,
802                                                     &acpi_wmi_ec_space_handler,
803                                                     NULL, NULL);
804         if (ACPI_FAILURE(status)) {
805                 pr_err("Error installing EC region handler\n");
806                 return -ENODEV;
807         }
808 
809         error = parse_wdg(device->handle);
810         if (error) {
811                 acpi_remove_address_space_handler(device->handle,
812                                                   ACPI_ADR_SPACE_EC,
813                                                   &acpi_wmi_ec_space_handler);
814                 pr_err("Failed to parse WDG method\n");
815                 return error;
816         }
817 
818         return 0;
819 }
820 
821 static int __init acpi_wmi_init(void)
822 {
823         int error;
824 
825         if (acpi_disabled)
826                 return -ENODEV;
827 
828         error = class_register(&wmi_class);
829         if (error)
830                 return error;
831 
832         error = acpi_bus_register_driver(&acpi_wmi_driver);
833         if (error) {
834                 pr_err("Error loading mapper\n");
835                 class_unregister(&wmi_class);
836                 return error;
837         }
838 
839         pr_info("Mapper loaded\n");
840         return 0;
841 }
842 
843 static void __exit acpi_wmi_exit(void)
844 {
845         acpi_bus_unregister_driver(&acpi_wmi_driver);
846         class_unregister(&wmi_class);
847 
848         pr_info("Mapper unloaded\n");
849 }
850 
851 subsys_initcall(acpi_wmi_init);
852 module_exit(acpi_wmi_exit);
853 

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