Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/acpi/power.c

  1 /*
  2  *  acpi_power.c - ACPI Bus Power Management ($Revision: 39 $)
  3  *
  4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  6  *
  7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  8  *
  9  *  This program is free software; you can redistribute it and/or modify
 10  *  it under the terms of the GNU General Public License as published by
 11  *  the Free Software Foundation; either version 2 of the License, or (at
 12  *  your option) any later version.
 13  *
 14  *  This program is distributed in the hope that it will be useful, but
 15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  *  General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License along
 20  *  with this program; if not, write to the Free Software Foundation, Inc.,
 21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 22  *
 23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 
 26 /*
 27  * ACPI power-managed devices may be controlled in two ways:
 28  * 1. via "Device Specific (D-State) Control"
 29  * 2. via "Power Resource Control".
 30  * This module is used to manage devices relying on Power Resource Control.
 31  * 
 32  * An ACPI "power resource object" describes a software controllable power
 33  * plane, clock plane, or other resource used by a power managed device.
 34  * A device may rely on multiple power resources, and a power resource
 35  * may be shared by multiple devices.
 36  */
 37 
 38 #include <linux/kernel.h>
 39 #include <linux/module.h>
 40 #include <linux/init.h>
 41 #include <linux/types.h>
 42 #include <linux/slab.h>
 43 #include <linux/pm_runtime.h>
 44 #include <linux/sysfs.h>
 45 #include <linux/acpi.h>
 46 #include "sleep.h"
 47 #include "internal.h"
 48 
 49 #define PREFIX "ACPI: "
 50 
 51 #define _COMPONENT                      ACPI_POWER_COMPONENT
 52 ACPI_MODULE_NAME("power");
 53 #define ACPI_POWER_CLASS                "power_resource"
 54 #define ACPI_POWER_DEVICE_NAME          "Power Resource"
 55 #define ACPI_POWER_FILE_INFO            "info"
 56 #define ACPI_POWER_FILE_STATUS          "state"
 57 #define ACPI_POWER_RESOURCE_STATE_OFF   0x00
 58 #define ACPI_POWER_RESOURCE_STATE_ON    0x01
 59 #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
 60 
 61 struct acpi_power_resource {
 62         struct acpi_device device;
 63         struct list_head list_node;
 64         char *name;
 65         u32 system_level;
 66         u32 order;
 67         unsigned int ref_count;
 68         bool wakeup_enabled;
 69         struct mutex resource_lock;
 70 };
 71 
 72 struct acpi_power_resource_entry {
 73         struct list_head node;
 74         struct acpi_power_resource *resource;
 75 };
 76 
 77 static LIST_HEAD(acpi_power_resource_list);
 78 static DEFINE_MUTEX(power_resource_list_lock);
 79 
 80 /* --------------------------------------------------------------------------
 81                              Power Resource Management
 82    -------------------------------------------------------------------------- */
 83 
 84 static inline
 85 struct acpi_power_resource *to_power_resource(struct acpi_device *device)
 86 {
 87         return container_of(device, struct acpi_power_resource, device);
 88 }
 89 
 90 static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
 91 {
 92         struct acpi_device *device;
 93 
 94         if (acpi_bus_get_device(handle, &device))
 95                 return NULL;
 96 
 97         return to_power_resource(device);
 98 }
 99 
100 static int acpi_power_resources_list_add(acpi_handle handle,
101                                          struct list_head *list)
102 {
103         struct acpi_power_resource *resource = acpi_power_get_context(handle);
104         struct acpi_power_resource_entry *entry;
105 
106         if (!resource || !list)
107                 return -EINVAL;
108 
109         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
110         if (!entry)
111                 return -ENOMEM;
112 
113         entry->resource = resource;
114         if (!list_empty(list)) {
115                 struct acpi_power_resource_entry *e;
116 
117                 list_for_each_entry(e, list, node)
118                         if (e->resource->order > resource->order) {
119                                 list_add_tail(&entry->node, &e->node);
120                                 return 0;
121                         }
122         }
123         list_add_tail(&entry->node, list);
124         return 0;
125 }
126 
127 void acpi_power_resources_list_free(struct list_head *list)
128 {
129         struct acpi_power_resource_entry *entry, *e;
130 
131         list_for_each_entry_safe(entry, e, list, node) {
132                 list_del(&entry->node);
133                 kfree(entry);
134         }
135 }
136 
137 int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
138                                  struct list_head *list)
139 {
140         unsigned int i;
141         int err = 0;
142 
143         for (i = start; i < package->package.count; i++) {
144                 union acpi_object *element = &package->package.elements[i];
145                 acpi_handle rhandle;
146 
147                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
148                         err = -ENODATA;
149                         break;
150                 }
151                 rhandle = element->reference.handle;
152                 if (!rhandle) {
153                         err = -ENODEV;
154                         break;
155                 }
156                 err = acpi_add_power_resource(rhandle);
157                 if (err)
158                         break;
159 
160                 err = acpi_power_resources_list_add(rhandle, list);
161                 if (err)
162                         break;
163         }
164         if (err)
165                 acpi_power_resources_list_free(list);
166 
167         return err;
168 }
169 
170 static int acpi_power_get_state(acpi_handle handle, int *state)
171 {
172         acpi_status status = AE_OK;
173         unsigned long long sta = 0;
174         char node_name[5];
175         struct acpi_buffer buffer = { sizeof(node_name), node_name };
176 
177 
178         if (!handle || !state)
179                 return -EINVAL;
180 
181         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
182         if (ACPI_FAILURE(status))
183                 return -ENODEV;
184 
185         *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
186                               ACPI_POWER_RESOURCE_STATE_OFF;
187 
188         acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
189 
190         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
191                           node_name,
192                                 *state ? "on" : "off"));
193 
194         return 0;
195 }
196 
197 static int acpi_power_get_list_state(struct list_head *list, int *state)
198 {
199         struct acpi_power_resource_entry *entry;
200         int cur_state;
201 
202         if (!list || !state)
203                 return -EINVAL;
204 
205         /* The state of the list is 'on' IFF all resources are 'on'. */
206         list_for_each_entry(entry, list, node) {
207                 struct acpi_power_resource *resource = entry->resource;
208                 acpi_handle handle = resource->device.handle;
209                 int result;
210 
211                 mutex_lock(&resource->resource_lock);
212                 result = acpi_power_get_state(handle, &cur_state);
213                 mutex_unlock(&resource->resource_lock);
214                 if (result)
215                         return result;
216 
217                 if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
218                         break;
219         }
220 
221         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
222                           cur_state ? "on" : "off"));
223 
224         *state = cur_state;
225         return 0;
226 }
227 
228 static int __acpi_power_on(struct acpi_power_resource *resource)
229 {
230         acpi_status status = AE_OK;
231 
232         status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
233         if (ACPI_FAILURE(status))
234                 return -ENODEV;
235 
236         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
237                           resource->name));
238 
239         return 0;
240 }
241 
242 static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
243 {
244         int result = 0;
245 
246         if (resource->ref_count++) {
247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248                                   "Power resource [%s] already on\n",
249                                   resource->name));
250         } else {
251                 result = __acpi_power_on(resource);
252                 if (result)
253                         resource->ref_count--;
254         }
255         return result;
256 }
257 
258 static int acpi_power_on(struct acpi_power_resource *resource)
259 {
260         int result;
261 
262         mutex_lock(&resource->resource_lock);
263         result = acpi_power_on_unlocked(resource);
264         mutex_unlock(&resource->resource_lock);
265         return result;
266 }
267 
268 static int __acpi_power_off(struct acpi_power_resource *resource)
269 {
270         acpi_status status;
271 
272         status = acpi_evaluate_object(resource->device.handle, "_OFF",
273                                       NULL, NULL);
274         if (ACPI_FAILURE(status))
275                 return -ENODEV;
276 
277         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",
278                           resource->name));
279         return 0;
280 }
281 
282 static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
283 {
284         int result = 0;
285 
286         if (!resource->ref_count) {
287                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
288                                   "Power resource [%s] already off\n",
289                                   resource->name));
290                 return 0;
291         }
292 
293         if (--resource->ref_count) {
294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
295                                   "Power resource [%s] still in use\n",
296                                   resource->name));
297         } else {
298                 result = __acpi_power_off(resource);
299                 if (result)
300                         resource->ref_count++;
301         }
302         return result;
303 }
304 
305 static int acpi_power_off(struct acpi_power_resource *resource)
306 {
307         int result;
308 
309         mutex_lock(&resource->resource_lock);
310         result = acpi_power_off_unlocked(resource);
311         mutex_unlock(&resource->resource_lock);
312         return result;
313 }
314 
315 static int acpi_power_off_list(struct list_head *list)
316 {
317         struct acpi_power_resource_entry *entry;
318         int result = 0;
319 
320         list_for_each_entry_reverse(entry, list, node) {
321                 result = acpi_power_off(entry->resource);
322                 if (result)
323                         goto err;
324         }
325         return 0;
326 
327  err:
328         list_for_each_entry_continue(entry, list, node)
329                 acpi_power_on(entry->resource);
330 
331         return result;
332 }
333 
334 static int acpi_power_on_list(struct list_head *list)
335 {
336         struct acpi_power_resource_entry *entry;
337         int result = 0;
338 
339         list_for_each_entry(entry, list, node) {
340                 result = acpi_power_on(entry->resource);
341                 if (result)
342                         goto err;
343         }
344         return 0;
345 
346  err:
347         list_for_each_entry_continue_reverse(entry, list, node)
348                 acpi_power_off(entry->resource);
349 
350         return result;
351 }
352 
353 static struct attribute *attrs[] = {
354         NULL,
355 };
356 
357 static struct attribute_group attr_groups[] = {
358         [ACPI_STATE_D0] = {
359                 .name = "power_resources_D0",
360                 .attrs = attrs,
361         },
362         [ACPI_STATE_D1] = {
363                 .name = "power_resources_D1",
364                 .attrs = attrs,
365         },
366         [ACPI_STATE_D2] = {
367                 .name = "power_resources_D2",
368                 .attrs = attrs,
369         },
370         [ACPI_STATE_D3_HOT] = {
371                 .name = "power_resources_D3hot",
372                 .attrs = attrs,
373         },
374 };
375 
376 static struct attribute_group wakeup_attr_group = {
377         .name = "power_resources_wakeup",
378         .attrs = attrs,
379 };
380 
381 static void acpi_power_hide_list(struct acpi_device *adev,
382                                  struct list_head *resources,
383                                  struct attribute_group *attr_group)
384 {
385         struct acpi_power_resource_entry *entry;
386 
387         if (list_empty(resources))
388                 return;
389 
390         list_for_each_entry_reverse(entry, resources, node) {
391                 struct acpi_device *res_dev = &entry->resource->device;
392 
393                 sysfs_remove_link_from_group(&adev->dev.kobj,
394                                              attr_group->name,
395                                              dev_name(&res_dev->dev));
396         }
397         sysfs_remove_group(&adev->dev.kobj, attr_group);
398 }
399 
400 static void acpi_power_expose_list(struct acpi_device *adev,
401                                    struct list_head *resources,
402                                    struct attribute_group *attr_group)
403 {
404         struct acpi_power_resource_entry *entry;
405         int ret;
406 
407         if (list_empty(resources))
408                 return;
409 
410         ret = sysfs_create_group(&adev->dev.kobj, attr_group);
411         if (ret)
412                 return;
413 
414         list_for_each_entry(entry, resources, node) {
415                 struct acpi_device *res_dev = &entry->resource->device;
416 
417                 ret = sysfs_add_link_to_group(&adev->dev.kobj,
418                                               attr_group->name,
419                                               &res_dev->dev.kobj,
420                                               dev_name(&res_dev->dev));
421                 if (ret) {
422                         acpi_power_hide_list(adev, resources, attr_group);
423                         break;
424                 }
425         }
426 }
427 
428 static void acpi_power_expose_hide(struct acpi_device *adev,
429                                    struct list_head *resources,
430                                    struct attribute_group *attr_group,
431                                    bool expose)
432 {
433         if (expose)
434                 acpi_power_expose_list(adev, resources, attr_group);
435         else
436                 acpi_power_hide_list(adev, resources, attr_group);
437 }
438 
439 void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
440 {
441         int state;
442 
443         if (adev->wakeup.flags.valid)
444                 acpi_power_expose_hide(adev, &adev->wakeup.resources,
445                                        &wakeup_attr_group, add);
446 
447         if (!adev->power.flags.power_resources)
448                 return;
449 
450         for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
451                 acpi_power_expose_hide(adev,
452                                        &adev->power.states[state].resources,
453                                        &attr_groups[state], add);
454 }
455 
456 int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
457 {
458         struct acpi_power_resource_entry *entry;
459         int system_level = 5;
460 
461         list_for_each_entry(entry, list, node) {
462                 struct acpi_power_resource *resource = entry->resource;
463                 acpi_handle handle = resource->device.handle;
464                 int result;
465                 int state;
466 
467                 mutex_lock(&resource->resource_lock);
468 
469                 result = acpi_power_get_state(handle, &state);
470                 if (result) {
471                         mutex_unlock(&resource->resource_lock);
472                         return result;
473                 }
474                 if (state == ACPI_POWER_RESOURCE_STATE_ON) {
475                         resource->ref_count++;
476                         resource->wakeup_enabled = true;
477                 }
478                 if (system_level > resource->system_level)
479                         system_level = resource->system_level;
480 
481                 mutex_unlock(&resource->resource_lock);
482         }
483         *system_level_p = system_level;
484         return 0;
485 }
486 
487 /* --------------------------------------------------------------------------
488                              Device Power Management
489    -------------------------------------------------------------------------- */
490 
491 /**
492  * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
493  *                          ACPI 3.0) _PSW (Power State Wake)
494  * @dev: Device to handle.
495  * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
496  * @sleep_state: Target sleep state of the system.
497  * @dev_state: Target power state of the device.
498  *
499  * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
500  * State Wake) for the device, if present.  On failure reset the device's
501  * wakeup.flags.valid flag.
502  *
503  * RETURN VALUE:
504  * 0 if either _DSW or _PSW has been successfully executed
505  * 0 if neither _DSW nor _PSW has been found
506  * -ENODEV if the execution of either _DSW or _PSW has failed
507  */
508 int acpi_device_sleep_wake(struct acpi_device *dev,
509                            int enable, int sleep_state, int dev_state)
510 {
511         union acpi_object in_arg[3];
512         struct acpi_object_list arg_list = { 3, in_arg };
513         acpi_status status = AE_OK;
514 
515         /*
516          * Try to execute _DSW first.
517          *
518          * Three agruments are needed for the _DSW object:
519          * Argument 0: enable/disable the wake capabilities
520          * Argument 1: target system state
521          * Argument 2: target device state
522          * When _DSW object is called to disable the wake capabilities, maybe
523          * the first argument is filled. The values of the other two agruments
524          * are meaningless.
525          */
526         in_arg[0].type = ACPI_TYPE_INTEGER;
527         in_arg[0].integer.value = enable;
528         in_arg[1].type = ACPI_TYPE_INTEGER;
529         in_arg[1].integer.value = sleep_state;
530         in_arg[2].type = ACPI_TYPE_INTEGER;
531         in_arg[2].integer.value = dev_state;
532         status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
533         if (ACPI_SUCCESS(status)) {
534                 return 0;
535         } else if (status != AE_NOT_FOUND) {
536                 printk(KERN_ERR PREFIX "_DSW execution failed\n");
537                 dev->wakeup.flags.valid = 0;
538                 return -ENODEV;
539         }
540 
541         /* Execute _PSW */
542         status = acpi_execute_simple_method(dev->handle, "_PSW", enable);
543         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
544                 printk(KERN_ERR PREFIX "_PSW execution failed\n");
545                 dev->wakeup.flags.valid = 0;
546                 return -ENODEV;
547         }
548 
549         return 0;
550 }
551 
552 /*
553  * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
554  * 1. Power on the power resources required for the wakeup device 
555  * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
556  *    State Wake) for the device, if present
557  */
558 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
559 {
560         struct acpi_power_resource_entry *entry;
561         int err = 0;
562 
563         if (!dev || !dev->wakeup.flags.valid)
564                 return -EINVAL;
565 
566         mutex_lock(&acpi_device_lock);
567 
568         if (dev->wakeup.prepare_count++)
569                 goto out;
570 
571         list_for_each_entry(entry, &dev->wakeup.resources, node) {
572                 struct acpi_power_resource *resource = entry->resource;
573 
574                 mutex_lock(&resource->resource_lock);
575 
576                 if (!resource->wakeup_enabled) {
577                         err = acpi_power_on_unlocked(resource);
578                         if (!err)
579                                 resource->wakeup_enabled = true;
580                 }
581 
582                 mutex_unlock(&resource->resource_lock);
583 
584                 if (err) {
585                         dev_err(&dev->dev,
586                                 "Cannot turn wakeup power resources on\n");
587                         dev->wakeup.flags.valid = 0;
588                         goto out;
589                 }
590         }
591         /*
592          * Passing 3 as the third argument below means the device may be
593          * put into arbitrary power state afterward.
594          */
595         err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
596         if (err)
597                 dev->wakeup.prepare_count = 0;
598 
599  out:
600         mutex_unlock(&acpi_device_lock);
601         return err;
602 }
603 
604 /*
605  * Shutdown a wakeup device, counterpart of above method
606  * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
607  *    State Wake) for the device, if present
608  * 2. Shutdown down the power resources
609  */
610 int acpi_disable_wakeup_device_power(struct acpi_device *dev)
611 {
612         struct acpi_power_resource_entry *entry;
613         int err = 0;
614 
615         if (!dev || !dev->wakeup.flags.valid)
616                 return -EINVAL;
617 
618         mutex_lock(&acpi_device_lock);
619 
620         if (--dev->wakeup.prepare_count > 0)
621                 goto out;
622 
623         /*
624          * Executing the code below even if prepare_count is already zero when
625          * the function is called may be useful, for example for initialisation.
626          */
627         if (dev->wakeup.prepare_count < 0)
628                 dev->wakeup.prepare_count = 0;
629 
630         err = acpi_device_sleep_wake(dev, 0, 0, 0);
631         if (err)
632                 goto out;
633 
634         list_for_each_entry(entry, &dev->wakeup.resources, node) {
635                 struct acpi_power_resource *resource = entry->resource;
636 
637                 mutex_lock(&resource->resource_lock);
638 
639                 if (resource->wakeup_enabled) {
640                         err = acpi_power_off_unlocked(resource);
641                         if (!err)
642                                 resource->wakeup_enabled = false;
643                 }
644 
645                 mutex_unlock(&resource->resource_lock);
646 
647                 if (err) {
648                         dev_err(&dev->dev,
649                                 "Cannot turn wakeup power resources off\n");
650                         dev->wakeup.flags.valid = 0;
651                         break;
652                 }
653         }
654 
655  out:
656         mutex_unlock(&acpi_device_lock);
657         return err;
658 }
659 
660 int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
661 {
662         int result = 0;
663         int list_state = 0;
664         int i = 0;
665 
666         if (!device || !state)
667                 return -EINVAL;
668 
669         /*
670          * We know a device's inferred power state when all the resources
671          * required for a given D-state are 'on'.
672          */
673         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
674                 struct list_head *list = &device->power.states[i].resources;
675 
676                 if (list_empty(list))
677                         continue;
678 
679                 result = acpi_power_get_list_state(list, &list_state);
680                 if (result)
681                         return result;
682 
683                 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
684                         *state = i;
685                         return 0;
686                 }
687         }
688 
689         *state = ACPI_STATE_D3_COLD;
690         return 0;
691 }
692 
693 int acpi_power_on_resources(struct acpi_device *device, int state)
694 {
695         if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
696                 return -EINVAL;
697 
698         return acpi_power_on_list(&device->power.states[state].resources);
699 }
700 
701 int acpi_power_transition(struct acpi_device *device, int state)
702 {
703         int result = 0;
704 
705         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
706                 return -EINVAL;
707 
708         if (device->power.state == state || !device->flags.power_manageable)
709                 return 0;
710 
711         if ((device->power.state < ACPI_STATE_D0)
712             || (device->power.state > ACPI_STATE_D3_COLD))
713                 return -ENODEV;
714 
715         /* TBD: Resources must be ordered. */
716 
717         /*
718          * First we reference all power resources required in the target list
719          * (e.g. so the device doesn't lose power while transitioning).  Then,
720          * we dereference all power resources used in the current list.
721          */
722         if (state < ACPI_STATE_D3_COLD)
723                 result = acpi_power_on_list(
724                         &device->power.states[state].resources);
725 
726         if (!result && device->power.state < ACPI_STATE_D3_COLD)
727                 acpi_power_off_list(
728                         &device->power.states[device->power.state].resources);
729 
730         /* We shouldn't change the state unless the above operations succeed. */
731         device->power.state = result ? ACPI_STATE_UNKNOWN : state;
732 
733         return result;
734 }
735 
736 static void acpi_release_power_resource(struct device *dev)
737 {
738         struct acpi_device *device = to_acpi_device(dev);
739         struct acpi_power_resource *resource;
740 
741         resource = container_of(device, struct acpi_power_resource, device);
742 
743         mutex_lock(&power_resource_list_lock);
744         list_del(&resource->list_node);
745         mutex_unlock(&power_resource_list_lock);
746 
747         acpi_free_pnp_ids(&device->pnp);
748         kfree(resource);
749 }
750 
751 static ssize_t acpi_power_in_use_show(struct device *dev,
752                                       struct device_attribute *attr,
753                                       char *buf) {
754         struct acpi_power_resource *resource;
755 
756         resource = to_power_resource(to_acpi_device(dev));
757         return sprintf(buf, "%u\n", !!resource->ref_count);
758 }
759 static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);
760 
761 static void acpi_power_sysfs_remove(struct acpi_device *device)
762 {
763         device_remove_file(&device->dev, &dev_attr_resource_in_use);
764 }
765 
766 int acpi_add_power_resource(acpi_handle handle)
767 {
768         struct acpi_power_resource *resource;
769         struct acpi_device *device = NULL;
770         union acpi_object acpi_object;
771         struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
772         acpi_status status;
773         int state, result = -ENODEV;
774 
775         acpi_bus_get_device(handle, &device);
776         if (device)
777                 return 0;
778 
779         resource = kzalloc(sizeof(*resource), GFP_KERNEL);
780         if (!resource)
781                 return -ENOMEM;
782 
783         device = &resource->device;
784         acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
785                                 ACPI_STA_DEFAULT);
786         mutex_init(&resource->resource_lock);
787         INIT_LIST_HEAD(&resource->list_node);
788         resource->name = device->pnp.bus_id;
789         strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
790         strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
791         device->power.state = ACPI_STATE_UNKNOWN;
792 
793         /* Evalute the object to get the system level and resource order. */
794         status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
795         if (ACPI_FAILURE(status))
796                 goto err;
797 
798         resource->system_level = acpi_object.power_resource.system_level;
799         resource->order = acpi_object.power_resource.resource_order;
800 
801         result = acpi_power_get_state(handle, &state);
802         if (result)
803                 goto err;
804 
805         printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
806                acpi_device_bid(device), state ? "on" : "off");
807 
808         device->flags.match_driver = true;
809         result = acpi_device_add(device, acpi_release_power_resource);
810         if (result)
811                 goto err;
812 
813         if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
814                 device->remove = acpi_power_sysfs_remove;
815 
816         mutex_lock(&power_resource_list_lock);
817         list_add(&resource->list_node, &acpi_power_resource_list);
818         mutex_unlock(&power_resource_list_lock);
819         acpi_device_add_finalize(device);
820         return 0;
821 
822  err:
823         acpi_release_power_resource(&device->dev);
824         return result;
825 }
826 
827 #ifdef CONFIG_ACPI_SLEEP
828 void acpi_resume_power_resources(void)
829 {
830         struct acpi_power_resource *resource;
831 
832         mutex_lock(&power_resource_list_lock);
833 
834         list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
835                 int result, state;
836 
837                 mutex_lock(&resource->resource_lock);
838 
839                 result = acpi_power_get_state(resource->device.handle, &state);
840                 if (result) {
841                         mutex_unlock(&resource->resource_lock);
842                         continue;
843                 }
844 
845                 if (state == ACPI_POWER_RESOURCE_STATE_OFF
846                     && resource->ref_count) {
847                         dev_info(&resource->device.dev, "Turning ON\n");
848                         __acpi_power_on(resource);
849                 } else if (state == ACPI_POWER_RESOURCE_STATE_ON
850                     && !resource->ref_count) {
851                         dev_info(&resource->device.dev, "Turning OFF\n");
852                         __acpi_power_off(resource);
853                 }
854 
855                 mutex_unlock(&resource->resource_lock);
856         }
857 
858         mutex_unlock(&power_resource_list_lock);
859 }
860 #endif
861 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us