dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / acpi / power.c
blob1c2b846c577604d0b471e87d19cecea6caa286f9
1 /*
2 * drivers/acpi/power.c - ACPI Power Resources management.
4 * Copyright (C) 2001 - 2015 Intel Corp.
5 * Author: Andy Grover <andrew.grover@intel.com>
6 * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 * ACPI power-managed devices may be controlled in two ways:
26 * 1. via "Device Specific (D-State) Control"
27 * 2. via "Power Resource Control".
28 * The code below deals with ACPI Power Resources control.
30 * An ACPI "power resource object" represents a software controllable power
31 * plane, clock plane, or other resource depended on by a device.
33 * A device may rely on multiple power resources, and a power resource
34 * may be shared by multiple devices.
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/pm_runtime.h>
43 #include <linux/sysfs.h>
44 #include <linux/acpi.h>
45 #include "sleep.h"
46 #include "internal.h"
48 #define _COMPONENT ACPI_POWER_COMPONENT
49 ACPI_MODULE_NAME("power");
50 #define ACPI_POWER_CLASS "power_resource"
51 #define ACPI_POWER_DEVICE_NAME "Power Resource"
52 #define ACPI_POWER_FILE_INFO "info"
53 #define ACPI_POWER_FILE_STATUS "state"
54 #define ACPI_POWER_RESOURCE_STATE_OFF 0x00
55 #define ACPI_POWER_RESOURCE_STATE_ON 0x01
56 #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
58 struct acpi_power_resource {
59 struct acpi_device device;
60 struct list_head list_node;
61 char *name;
62 u32 system_level;
63 u32 order;
64 unsigned int ref_count;
65 bool wakeup_enabled;
66 struct mutex resource_lock;
69 struct acpi_power_resource_entry {
70 struct list_head node;
71 struct acpi_power_resource *resource;
74 static LIST_HEAD(acpi_power_resource_list);
75 static DEFINE_MUTEX(power_resource_list_lock);
77 /* --------------------------------------------------------------------------
78 Power Resource Management
79 -------------------------------------------------------------------------- */
81 static inline
82 struct acpi_power_resource *to_power_resource(struct acpi_device *device)
84 return container_of(device, struct acpi_power_resource, device);
87 static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
89 struct acpi_device *device;
91 if (acpi_bus_get_device(handle, &device))
92 return NULL;
94 return to_power_resource(device);
97 static int acpi_power_resources_list_add(acpi_handle handle,
98 struct list_head *list)
100 struct acpi_power_resource *resource = acpi_power_get_context(handle);
101 struct acpi_power_resource_entry *entry;
103 if (!resource || !list)
104 return -EINVAL;
106 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
107 if (!entry)
108 return -ENOMEM;
110 entry->resource = resource;
111 if (!list_empty(list)) {
112 struct acpi_power_resource_entry *e;
114 list_for_each_entry(e, list, node)
115 if (e->resource->order > resource->order) {
116 list_add_tail(&entry->node, &e->node);
117 return 0;
120 list_add_tail(&entry->node, list);
121 return 0;
124 void acpi_power_resources_list_free(struct list_head *list)
126 struct acpi_power_resource_entry *entry, *e;
128 list_for_each_entry_safe(entry, e, list, node) {
129 list_del(&entry->node);
130 kfree(entry);
134 int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
135 struct list_head *list)
137 unsigned int i;
138 int err = 0;
140 for (i = start; i < package->package.count; i++) {
141 union acpi_object *element = &package->package.elements[i];
142 acpi_handle rhandle;
144 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
145 err = -ENODATA;
146 break;
148 rhandle = element->reference.handle;
149 if (!rhandle) {
150 err = -ENODEV;
151 break;
153 err = acpi_add_power_resource(rhandle);
154 if (err)
155 break;
157 err = acpi_power_resources_list_add(rhandle, list);
158 if (err)
159 break;
161 if (err)
162 acpi_power_resources_list_free(list);
164 return err;
167 static int acpi_power_get_state(acpi_handle handle, int *state)
169 acpi_status status = AE_OK;
170 unsigned long long sta = 0;
171 char node_name[5];
172 struct acpi_buffer buffer = { sizeof(node_name), node_name };
175 if (!handle || !state)
176 return -EINVAL;
178 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
179 if (ACPI_FAILURE(status))
180 return -ENODEV;
182 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
183 ACPI_POWER_RESOURCE_STATE_OFF;
185 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
187 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
188 node_name,
189 *state ? "on" : "off"));
191 return 0;
194 static int acpi_power_get_list_state(struct list_head *list, int *state)
196 struct acpi_power_resource_entry *entry;
197 int cur_state;
199 if (!list || !state)
200 return -EINVAL;
202 /* The state of the list is 'on' IFF all resources are 'on'. */
203 cur_state = 0;
204 list_for_each_entry(entry, list, node) {
205 struct acpi_power_resource *resource = entry->resource;
206 acpi_handle handle = resource->device.handle;
207 int result;
209 mutex_lock(&resource->resource_lock);
210 result = acpi_power_get_state(handle, &cur_state);
211 mutex_unlock(&resource->resource_lock);
212 if (result)
213 return result;
215 if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
216 break;
219 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
220 cur_state ? "on" : "off"));
222 *state = cur_state;
223 return 0;
226 static int __acpi_power_on(struct acpi_power_resource *resource)
228 acpi_status status = AE_OK;
230 status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
231 if (ACPI_FAILURE(status))
232 return -ENODEV;
234 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
235 resource->name));
237 return 0;
240 static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
242 int result = 0;
244 if (resource->ref_count++) {
245 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
246 "Power resource [%s] already on\n",
247 resource->name));
248 } else {
249 result = __acpi_power_on(resource);
250 if (result)
251 resource->ref_count--;
253 return result;
256 static int acpi_power_on(struct acpi_power_resource *resource)
258 int result;
260 mutex_lock(&resource->resource_lock);
261 result = acpi_power_on_unlocked(resource);
262 mutex_unlock(&resource->resource_lock);
263 return result;
266 static int __acpi_power_off(struct acpi_power_resource *resource)
268 acpi_status status;
270 status = acpi_evaluate_object(resource->device.handle, "_OFF",
271 NULL, NULL);
272 if (ACPI_FAILURE(status))
273 return -ENODEV;
275 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",
276 resource->name));
277 return 0;
280 static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
282 int result = 0;
284 if (!resource->ref_count) {
285 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
286 "Power resource [%s] already off\n",
287 resource->name));
288 return 0;
291 if (--resource->ref_count) {
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
293 "Power resource [%s] still in use\n",
294 resource->name));
295 } else {
296 result = __acpi_power_off(resource);
297 if (result)
298 resource->ref_count++;
300 return result;
303 static int acpi_power_off(struct acpi_power_resource *resource)
305 int result;
307 mutex_lock(&resource->resource_lock);
308 result = acpi_power_off_unlocked(resource);
309 mutex_unlock(&resource->resource_lock);
310 return result;
313 static int acpi_power_off_list(struct list_head *list)
315 struct acpi_power_resource_entry *entry;
316 int result = 0;
318 list_for_each_entry_reverse(entry, list, node) {
319 result = acpi_power_off(entry->resource);
320 if (result)
321 goto err;
323 return 0;
325 err:
326 list_for_each_entry_continue(entry, list, node)
327 acpi_power_on(entry->resource);
329 return result;
332 static int acpi_power_on_list(struct list_head *list)
334 struct acpi_power_resource_entry *entry;
335 int result = 0;
337 list_for_each_entry(entry, list, node) {
338 result = acpi_power_on(entry->resource);
339 if (result)
340 goto err;
342 return 0;
344 err:
345 list_for_each_entry_continue_reverse(entry, list, node)
346 acpi_power_off(entry->resource);
348 return result;
351 static struct attribute *attrs[] = {
352 NULL,
355 static struct attribute_group attr_groups[] = {
356 [ACPI_STATE_D0] = {
357 .name = "power_resources_D0",
358 .attrs = attrs,
360 [ACPI_STATE_D1] = {
361 .name = "power_resources_D1",
362 .attrs = attrs,
364 [ACPI_STATE_D2] = {
365 .name = "power_resources_D2",
366 .attrs = attrs,
368 [ACPI_STATE_D3_HOT] = {
369 .name = "power_resources_D3hot",
370 .attrs = attrs,
374 static struct attribute_group wakeup_attr_group = {
375 .name = "power_resources_wakeup",
376 .attrs = attrs,
379 static void acpi_power_hide_list(struct acpi_device *adev,
380 struct list_head *resources,
381 struct attribute_group *attr_group)
383 struct acpi_power_resource_entry *entry;
385 if (list_empty(resources))
386 return;
388 list_for_each_entry_reverse(entry, resources, node) {
389 struct acpi_device *res_dev = &entry->resource->device;
391 sysfs_remove_link_from_group(&adev->dev.kobj,
392 attr_group->name,
393 dev_name(&res_dev->dev));
395 sysfs_remove_group(&adev->dev.kobj, attr_group);
398 static void acpi_power_expose_list(struct acpi_device *adev,
399 struct list_head *resources,
400 struct attribute_group *attr_group)
402 struct acpi_power_resource_entry *entry;
403 int ret;
405 if (list_empty(resources))
406 return;
408 ret = sysfs_create_group(&adev->dev.kobj, attr_group);
409 if (ret)
410 return;
412 list_for_each_entry(entry, resources, node) {
413 struct acpi_device *res_dev = &entry->resource->device;
415 ret = sysfs_add_link_to_group(&adev->dev.kobj,
416 attr_group->name,
417 &res_dev->dev.kobj,
418 dev_name(&res_dev->dev));
419 if (ret) {
420 acpi_power_hide_list(adev, resources, attr_group);
421 break;
426 static void acpi_power_expose_hide(struct acpi_device *adev,
427 struct list_head *resources,
428 struct attribute_group *attr_group,
429 bool expose)
431 if (expose)
432 acpi_power_expose_list(adev, resources, attr_group);
433 else
434 acpi_power_hide_list(adev, resources, attr_group);
437 void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
439 int state;
441 if (adev->wakeup.flags.valid)
442 acpi_power_expose_hide(adev, &adev->wakeup.resources,
443 &wakeup_attr_group, add);
445 if (!adev->power.flags.power_resources)
446 return;
448 for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
449 acpi_power_expose_hide(adev,
450 &adev->power.states[state].resources,
451 &attr_groups[state], add);
454 int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
456 struct acpi_power_resource_entry *entry;
457 int system_level = 5;
459 list_for_each_entry(entry, list, node) {
460 struct acpi_power_resource *resource = entry->resource;
461 acpi_handle handle = resource->device.handle;
462 int result;
463 int state;
465 mutex_lock(&resource->resource_lock);
467 result = acpi_power_get_state(handle, &state);
468 if (result) {
469 mutex_unlock(&resource->resource_lock);
470 return result;
472 if (state == ACPI_POWER_RESOURCE_STATE_ON) {
473 resource->ref_count++;
474 resource->wakeup_enabled = true;
476 if (system_level > resource->system_level)
477 system_level = resource->system_level;
479 mutex_unlock(&resource->resource_lock);
481 *system_level_p = system_level;
482 return 0;
485 /* --------------------------------------------------------------------------
486 Device Power Management
487 -------------------------------------------------------------------------- */
490 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
491 * ACPI 3.0) _PSW (Power State Wake)
492 * @dev: Device to handle.
493 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
494 * @sleep_state: Target sleep state of the system.
495 * @dev_state: Target power state of the device.
497 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
498 * State Wake) for the device, if present. On failure reset the device's
499 * wakeup.flags.valid flag.
501 * RETURN VALUE:
502 * 0 if either _DSW or _PSW has been successfully executed
503 * 0 if neither _DSW nor _PSW has been found
504 * -ENODEV if the execution of either _DSW or _PSW has failed
506 int acpi_device_sleep_wake(struct acpi_device *dev,
507 int enable, int sleep_state, int dev_state)
509 union acpi_object in_arg[3];
510 struct acpi_object_list arg_list = { 3, in_arg };
511 acpi_status status = AE_OK;
514 * Try to execute _DSW first.
516 * Three agruments are needed for the _DSW object:
517 * Argument 0: enable/disable the wake capabilities
518 * Argument 1: target system state
519 * Argument 2: target device state
520 * When _DSW object is called to disable the wake capabilities, maybe
521 * the first argument is filled. The values of the other two agruments
522 * are meaningless.
524 in_arg[0].type = ACPI_TYPE_INTEGER;
525 in_arg[0].integer.value = enable;
526 in_arg[1].type = ACPI_TYPE_INTEGER;
527 in_arg[1].integer.value = sleep_state;
528 in_arg[2].type = ACPI_TYPE_INTEGER;
529 in_arg[2].integer.value = dev_state;
530 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
531 if (ACPI_SUCCESS(status)) {
532 return 0;
533 } else if (status != AE_NOT_FOUND) {
534 printk(KERN_ERR PREFIX "_DSW execution failed\n");
535 dev->wakeup.flags.valid = 0;
536 return -ENODEV;
539 /* Execute _PSW */
540 status = acpi_execute_simple_method(dev->handle, "_PSW", enable);
541 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
542 printk(KERN_ERR PREFIX "_PSW execution failed\n");
543 dev->wakeup.flags.valid = 0;
544 return -ENODEV;
547 return 0;
551 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
552 * 1. Power on the power resources required for the wakeup device
553 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
554 * State Wake) for the device, if present
556 int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
558 struct acpi_power_resource_entry *entry;
559 int err = 0;
561 if (!dev || !dev->wakeup.flags.valid)
562 return -EINVAL;
564 mutex_lock(&acpi_device_lock);
566 if (dev->wakeup.prepare_count++)
567 goto out;
569 list_for_each_entry(entry, &dev->wakeup.resources, node) {
570 struct acpi_power_resource *resource = entry->resource;
572 mutex_lock(&resource->resource_lock);
574 if (!resource->wakeup_enabled) {
575 err = acpi_power_on_unlocked(resource);
576 if (!err)
577 resource->wakeup_enabled = true;
580 mutex_unlock(&resource->resource_lock);
582 if (err) {
583 dev_err(&dev->dev,
584 "Cannot turn wakeup power resources on\n");
585 dev->wakeup.flags.valid = 0;
586 goto out;
590 * Passing 3 as the third argument below means the device may be
591 * put into arbitrary power state afterward.
593 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
594 if (err)
595 dev->wakeup.prepare_count = 0;
597 out:
598 mutex_unlock(&acpi_device_lock);
599 return err;
603 * Shutdown a wakeup device, counterpart of above method
604 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
605 * State Wake) for the device, if present
606 * 2. Shutdown down the power resources
608 int acpi_disable_wakeup_device_power(struct acpi_device *dev)
610 struct acpi_power_resource_entry *entry;
611 int err = 0;
613 if (!dev || !dev->wakeup.flags.valid)
614 return -EINVAL;
616 mutex_lock(&acpi_device_lock);
618 if (--dev->wakeup.prepare_count > 0)
619 goto out;
622 * Executing the code below even if prepare_count is already zero when
623 * the function is called may be useful, for example for initialisation.
625 if (dev->wakeup.prepare_count < 0)
626 dev->wakeup.prepare_count = 0;
628 err = acpi_device_sleep_wake(dev, 0, 0, 0);
629 if (err)
630 goto out;
632 list_for_each_entry(entry, &dev->wakeup.resources, node) {
633 struct acpi_power_resource *resource = entry->resource;
635 mutex_lock(&resource->resource_lock);
637 if (resource->wakeup_enabled) {
638 err = acpi_power_off_unlocked(resource);
639 if (!err)
640 resource->wakeup_enabled = false;
643 mutex_unlock(&resource->resource_lock);
645 if (err) {
646 dev_err(&dev->dev,
647 "Cannot turn wakeup power resources off\n");
648 dev->wakeup.flags.valid = 0;
649 break;
653 out:
654 mutex_unlock(&acpi_device_lock);
655 return err;
658 int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
660 int result = 0;
661 int list_state = 0;
662 int i = 0;
664 if (!device || !state)
665 return -EINVAL;
668 * We know a device's inferred power state when all the resources
669 * required for a given D-state are 'on'.
671 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
672 struct list_head *list = &device->power.states[i].resources;
674 if (list_empty(list))
675 continue;
677 result = acpi_power_get_list_state(list, &list_state);
678 if (result)
679 return result;
681 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
682 *state = i;
683 return 0;
687 *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ?
688 ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT;
689 return 0;
692 int acpi_power_on_resources(struct acpi_device *device, int state)
694 if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
695 return -EINVAL;
697 return acpi_power_on_list(&device->power.states[state].resources);
700 int acpi_power_transition(struct acpi_device *device, int state)
702 int result = 0;
704 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
705 return -EINVAL;
707 if (device->power.state == state || !device->flags.power_manageable)
708 return 0;
710 if ((device->power.state < ACPI_STATE_D0)
711 || (device->power.state > ACPI_STATE_D3_COLD))
712 return -ENODEV;
715 * First we reference all power resources required in the target list
716 * (e.g. so the device doesn't lose power while transitioning). Then,
717 * we dereference all power resources used in the current list.
719 if (state < ACPI_STATE_D3_COLD)
720 result = acpi_power_on_list(
721 &device->power.states[state].resources);
723 if (!result && device->power.state < ACPI_STATE_D3_COLD)
724 acpi_power_off_list(
725 &device->power.states[device->power.state].resources);
727 /* We shouldn't change the state unless the above operations succeed. */
728 device->power.state = result ? ACPI_STATE_UNKNOWN : state;
730 return result;
733 static void acpi_release_power_resource(struct device *dev)
735 struct acpi_device *device = to_acpi_device(dev);
736 struct acpi_power_resource *resource;
738 resource = container_of(device, struct acpi_power_resource, device);
740 mutex_lock(&power_resource_list_lock);
741 list_del(&resource->list_node);
742 mutex_unlock(&power_resource_list_lock);
744 acpi_free_pnp_ids(&device->pnp);
745 kfree(resource);
748 static ssize_t acpi_power_in_use_show(struct device *dev,
749 struct device_attribute *attr,
750 char *buf) {
751 struct acpi_power_resource *resource;
753 resource = to_power_resource(to_acpi_device(dev));
754 return sprintf(buf, "%u\n", !!resource->ref_count);
756 static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);
758 static void acpi_power_sysfs_remove(struct acpi_device *device)
760 device_remove_file(&device->dev, &dev_attr_resource_in_use);
763 static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource)
765 mutex_lock(&power_resource_list_lock);
767 if (!list_empty(&acpi_power_resource_list)) {
768 struct acpi_power_resource *r;
770 list_for_each_entry(r, &acpi_power_resource_list, list_node)
771 if (r->order > resource->order) {
772 list_add_tail(&resource->list_node, &r->list_node);
773 goto out;
776 list_add_tail(&resource->list_node, &acpi_power_resource_list);
778 out:
779 mutex_unlock(&power_resource_list_lock);
782 int acpi_add_power_resource(acpi_handle handle)
784 struct acpi_power_resource *resource;
785 struct acpi_device *device = NULL;
786 union acpi_object acpi_object;
787 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
788 acpi_status status;
789 int state, result = -ENODEV;
791 acpi_bus_get_device(handle, &device);
792 if (device)
793 return 0;
795 resource = kzalloc(sizeof(*resource), GFP_KERNEL);
796 if (!resource)
797 return -ENOMEM;
799 device = &resource->device;
800 acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
801 ACPI_STA_DEFAULT);
802 mutex_init(&resource->resource_lock);
803 INIT_LIST_HEAD(&resource->list_node);
804 resource->name = device->pnp.bus_id;
805 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
806 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
807 device->power.state = ACPI_STATE_UNKNOWN;
809 /* Evalute the object to get the system level and resource order. */
810 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
811 if (ACPI_FAILURE(status))
812 goto err;
814 resource->system_level = acpi_object.power_resource.system_level;
815 resource->order = acpi_object.power_resource.resource_order;
817 result = acpi_power_get_state(handle, &state);
818 if (result)
819 goto err;
821 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
822 acpi_device_bid(device), state ? "on" : "off");
824 device->flags.match_driver = true;
825 result = acpi_device_add(device, acpi_release_power_resource);
826 if (result)
827 goto err;
829 if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
830 device->remove = acpi_power_sysfs_remove;
832 acpi_power_add_resource_to_list(resource);
833 acpi_device_add_finalize(device);
834 return 0;
836 err:
837 acpi_release_power_resource(&device->dev);
838 return result;
841 #ifdef CONFIG_ACPI_SLEEP
842 void acpi_resume_power_resources(void)
844 struct acpi_power_resource *resource;
846 mutex_lock(&power_resource_list_lock);
848 list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
849 int result, state;
851 mutex_lock(&resource->resource_lock);
853 result = acpi_power_get_state(resource->device.handle, &state);
854 if (result) {
855 mutex_unlock(&resource->resource_lock);
856 continue;
859 if (state == ACPI_POWER_RESOURCE_STATE_OFF
860 && resource->ref_count) {
861 dev_info(&resource->device.dev, "Turning ON\n");
862 __acpi_power_on(resource);
865 mutex_unlock(&resource->resource_lock);
867 list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
868 int result, state;
870 mutex_lock(&resource->resource_lock);
872 result = acpi_power_get_state(resource->device.handle, &state);
873 if (result) {
874 mutex_unlock(&resource->resource_lock);
875 continue;
878 if (state == ACPI_POWER_RESOURCE_STATE_ON
879 && !resource->ref_count) {
880 dev_info(&resource->device.dev, "Turning OFF\n");
881 __acpi_power_off(resource);
884 mutex_unlock(&resource->resource_lock);
887 mutex_unlock(&power_resource_list_lock);
889 #endif