Root/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 <acpi/acpi_bus.h>
45#include <acpi/acpi_drivers.h>
46#include "sleep.h"
47#include "internal.h"
48
49#define PREFIX "ACPI: "
50
51#define _COMPONENT ACPI_POWER_COMPONENT
52ACPI_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
61static int acpi_power_add(struct acpi_device *device);
62static int acpi_power_remove(struct acpi_device *device, int type);
63
64static const struct acpi_device_id power_device_ids[] = {
65    {ACPI_POWER_HID, 0},
66    {"", 0},
67};
68MODULE_DEVICE_TABLE(acpi, power_device_ids);
69
70#ifdef CONFIG_PM_SLEEP
71static int acpi_power_resume(struct device *dev);
72#endif
73static SIMPLE_DEV_PM_OPS(acpi_power_pm, NULL, acpi_power_resume);
74
75static struct acpi_driver acpi_power_driver = {
76    .name = "power",
77    .class = ACPI_POWER_CLASS,
78    .ids = power_device_ids,
79    .ops = {
80        .add = acpi_power_add,
81        .remove = acpi_power_remove,
82        },
83    .drv.pm = &acpi_power_pm,
84};
85
86/*
87 * A power managed device
88 * A device may rely on multiple power resources.
89 * */
90struct acpi_power_managed_device {
91    struct device *dev; /* The physical device */
92    acpi_handle *handle;
93};
94
95struct acpi_power_resource_device {
96    struct acpi_power_managed_device *device;
97    struct acpi_power_resource_device *next;
98};
99
100struct acpi_power_resource {
101    struct acpi_device * device;
102    acpi_bus_id name;
103    u32 system_level;
104    u32 order;
105    unsigned int ref_count;
106    struct mutex resource_lock;
107
108    /* List of devices relying on this power resource */
109    struct acpi_power_resource_device *devices;
110    struct mutex devices_lock;
111};
112
113static struct list_head acpi_power_resource_list;
114
115/* --------------------------------------------------------------------------
116                             Power Resource Management
117   -------------------------------------------------------------------------- */
118
119static int
120acpi_power_get_context(acpi_handle handle,
121               struct acpi_power_resource **resource)
122{
123    int result = 0;
124    struct acpi_device *device = NULL;
125
126
127    if (!resource)
128        return -ENODEV;
129
130    result = acpi_bus_get_device(handle, &device);
131    if (result) {
132        printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
133        return result;
134    }
135
136    *resource = acpi_driver_data(device);
137    if (!*resource)
138        return -ENODEV;
139
140    return 0;
141}
142
143static int acpi_power_get_state(acpi_handle handle, int *state)
144{
145    acpi_status status = AE_OK;
146    unsigned long long sta = 0;
147    char node_name[5];
148    struct acpi_buffer buffer = { sizeof(node_name), node_name };
149
150
151    if (!handle || !state)
152        return -EINVAL;
153
154    status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
155    if (ACPI_FAILURE(status))
156        return -ENODEV;
157
158    *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
159                  ACPI_POWER_RESOURCE_STATE_OFF;
160
161    acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
162
163    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
164              node_name,
165                *state ? "on" : "off"));
166
167    return 0;
168}
169
170static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
171{
172    int cur_state;
173    int i = 0;
174
175    if (!list || !state)
176        return -EINVAL;
177
178    /* The state of the list is 'on' IFF all resources are 'on'. */
179
180    for (i = 0; i < list->count; i++) {
181        struct acpi_power_resource *resource;
182        acpi_handle handle = list->handles[i];
183        int result;
184
185        result = acpi_power_get_context(handle, &resource);
186        if (result)
187            return result;
188
189        mutex_lock(&resource->resource_lock);
190
191        result = acpi_power_get_state(handle, &cur_state);
192
193        mutex_unlock(&resource->resource_lock);
194
195        if (result)
196            return result;
197
198        if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
199            break;
200    }
201
202    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
203              cur_state ? "on" : "off"));
204
205    *state = cur_state;
206
207    return 0;
208}
209
210/* Resume the device when all power resources in _PR0 are on */
211static void acpi_power_on_device(struct acpi_power_managed_device *device)
212{
213    struct acpi_device *acpi_dev;
214    acpi_handle handle = device->handle;
215    int state;
216
217    if (acpi_bus_get_device(handle, &acpi_dev))
218        return;
219
220    if(acpi_power_get_inferred_state(acpi_dev, &state))
221        return;
222
223    if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev))
224        pm_request_resume(device->dev);
225}
226
227static int __acpi_power_on(struct acpi_power_resource *resource)
228{
229    acpi_status status = AE_OK;
230
231    status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
232    if (ACPI_FAILURE(status))
233        return -ENODEV;
234
235    /* Update the power resource's _device_ power state */
236    resource->device->power.state = ACPI_STATE_D0;
237
238    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
239              resource->name));
240
241    return 0;
242}
243
244static int acpi_power_on(acpi_handle handle)
245{
246    int result = 0;
247    bool resume_device = false;
248    struct acpi_power_resource *resource = NULL;
249    struct acpi_power_resource_device *device_list;
250
251    result = acpi_power_get_context(handle, &resource);
252    if (result)
253        return result;
254
255    mutex_lock(&resource->resource_lock);
256
257    if (resource->ref_count++) {
258        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
259                  "Power resource [%s] already on",
260                  resource->name));
261    } else {
262        result = __acpi_power_on(resource);
263        if (result)
264            resource->ref_count--;
265        else
266            resume_device = true;
267    }
268
269    mutex_unlock(&resource->resource_lock);
270
271    if (!resume_device)
272        return result;
273
274    mutex_lock(&resource->devices_lock);
275
276    device_list = resource->devices;
277    while (device_list) {
278        acpi_power_on_device(device_list->device);
279        device_list = device_list->next;
280    }
281
282    mutex_unlock(&resource->devices_lock);
283
284    return result;
285}
286
287static int acpi_power_off(acpi_handle handle)
288{
289    int result = 0;
290    acpi_status status = AE_OK;
291    struct acpi_power_resource *resource = NULL;
292
293    result = acpi_power_get_context(handle, &resource);
294    if (result)
295        return result;
296
297    mutex_lock(&resource->resource_lock);
298
299    if (!resource->ref_count) {
300        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
301                  "Power resource [%s] already off",
302                  resource->name));
303        goto unlock;
304    }
305
306    if (--resource->ref_count) {
307        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
308                  "Power resource [%s] still in use\n",
309                  resource->name));
310        goto unlock;
311    }
312
313    status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
314    if (ACPI_FAILURE(status)) {
315        result = -ENODEV;
316    } else {
317        /* Update the power resource's _device_ power state */
318        resource->device->power.state = ACPI_STATE_D3;
319
320        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
321                  "Power resource [%s] turned off\n",
322                  resource->name));
323    }
324
325 unlock:
326    mutex_unlock(&resource->resource_lock);
327
328    return result;
329}
330
331static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
332{
333    int i;
334
335    for (i = num_res - 1; i >= 0 ; i--)
336        acpi_power_off(list->handles[i]);
337}
338
339static void acpi_power_off_list(struct acpi_handle_list *list)
340{
341    __acpi_power_off_list(list, list->count);
342}
343
344static int acpi_power_on_list(struct acpi_handle_list *list)
345{
346    int result = 0;
347    int i;
348
349    for (i = 0; i < list->count; i++) {
350        result = acpi_power_on(list->handles[i]);
351        if (result) {
352            __acpi_power_off_list(list, i);
353            break;
354        }
355    }
356
357    return result;
358}
359
360static void __acpi_power_resource_unregister_device(struct device *dev,
361        acpi_handle res_handle)
362{
363    struct acpi_power_resource *resource = NULL;
364    struct acpi_power_resource_device *prev, *curr;
365
366    if (acpi_power_get_context(res_handle, &resource))
367        return;
368
369    mutex_lock(&resource->devices_lock);
370    prev = NULL;
371    curr = resource->devices;
372    while (curr) {
373        if (curr->device->dev == dev) {
374            if (!prev)
375                resource->devices = curr->next;
376            else
377                prev->next = curr->next;
378
379            kfree(curr);
380            break;
381        }
382
383        prev = curr;
384        curr = curr->next;
385    }
386    mutex_unlock(&resource->devices_lock);
387}
388
389/* Unlink dev from all power resources in _PR0 */
390void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle)
391{
392    struct acpi_device *acpi_dev;
393    struct acpi_handle_list *list;
394    int i;
395
396    if (!dev || !handle)
397        return;
398
399    if (acpi_bus_get_device(handle, &acpi_dev))
400        return;
401
402    list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
403
404    for (i = 0; i < list->count; i++)
405        __acpi_power_resource_unregister_device(dev,
406            list->handles[i]);
407}
408EXPORT_SYMBOL_GPL(acpi_power_resource_unregister_device);
409
410static int __acpi_power_resource_register_device(
411    struct acpi_power_managed_device *powered_device, acpi_handle handle)
412{
413    struct acpi_power_resource *resource = NULL;
414    struct acpi_power_resource_device *power_resource_device;
415    int result;
416
417    result = acpi_power_get_context(handle, &resource);
418    if (result)
419        return result;
420
421    power_resource_device = kzalloc(
422        sizeof(*power_resource_device), GFP_KERNEL);
423    if (!power_resource_device)
424        return -ENOMEM;
425
426    power_resource_device->device = powered_device;
427
428    mutex_lock(&resource->devices_lock);
429    power_resource_device->next = resource->devices;
430    resource->devices = power_resource_device;
431    mutex_unlock(&resource->devices_lock);
432
433    return 0;
434}
435
436/* Link dev to all power resources in _PR0 */
437int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
438{
439    struct acpi_device *acpi_dev;
440    struct acpi_handle_list *list;
441    struct acpi_power_managed_device *powered_device;
442    int i, ret;
443
444    if (!dev || !handle)
445        return -ENODEV;
446
447    ret = acpi_bus_get_device(handle, &acpi_dev);
448    if (ret)
449        goto no_power_resource;
450
451    if (!acpi_dev->power.flags.power_resources)
452        goto no_power_resource;
453
454    powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
455    if (!powered_device)
456        return -ENOMEM;
457
458    powered_device->dev = dev;
459    powered_device->handle = handle;
460
461    list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
462
463    for (i = 0; i < list->count; i++) {
464        ret = __acpi_power_resource_register_device(powered_device,
465            list->handles[i]);
466
467        if (ret) {
468            acpi_power_resource_unregister_device(dev, handle);
469            break;
470        }
471    }
472
473    return ret;
474
475no_power_resource:
476    printk(KERN_DEBUG PREFIX "Invalid Power Resource to register!");
477    return -ENODEV;
478}
479EXPORT_SYMBOL_GPL(acpi_power_resource_register_device);
480
481/**
482 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
483 * ACPI 3.0) _PSW (Power State Wake)
484 * @dev: Device to handle.
485 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
486 * @sleep_state: Target sleep state of the system.
487 * @dev_state: Target power state of the device.
488 *
489 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
490 * State Wake) for the device, if present. On failure reset the device's
491 * wakeup.flags.valid flag.
492 *
493 * RETURN VALUE:
494 * 0 if either _DSW or _PSW has been successfully executed
495 * 0 if neither _DSW nor _PSW has been found
496 * -ENODEV if the execution of either _DSW or _PSW has failed
497 */
498int acpi_device_sleep_wake(struct acpi_device *dev,
499                           int enable, int sleep_state, int dev_state)
500{
501    union acpi_object in_arg[3];
502    struct acpi_object_list arg_list = { 3, in_arg };
503    acpi_status status = AE_OK;
504
505    /*
506     * Try to execute _DSW first.
507     *
508     * Three agruments are needed for the _DSW object:
509     * Argument 0: enable/disable the wake capabilities
510     * Argument 1: target system state
511     * Argument 2: target device state
512     * When _DSW object is called to disable the wake capabilities, maybe
513     * the first argument is filled. The values of the other two agruments
514     * are meaningless.
515     */
516    in_arg[0].type = ACPI_TYPE_INTEGER;
517    in_arg[0].integer.value = enable;
518    in_arg[1].type = ACPI_TYPE_INTEGER;
519    in_arg[1].integer.value = sleep_state;
520    in_arg[2].type = ACPI_TYPE_INTEGER;
521    in_arg[2].integer.value = dev_state;
522    status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
523    if (ACPI_SUCCESS(status)) {
524        return 0;
525    } else if (status != AE_NOT_FOUND) {
526        printk(KERN_ERR PREFIX "_DSW execution failed\n");
527        dev->wakeup.flags.valid = 0;
528        return -ENODEV;
529    }
530
531    /* Execute _PSW */
532    arg_list.count = 1;
533    in_arg[0].integer.value = enable;
534    status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
535    if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
536        printk(KERN_ERR PREFIX "_PSW execution failed\n");
537        dev->wakeup.flags.valid = 0;
538        return -ENODEV;
539    }
540
541    return 0;
542}
543
544/*
545 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
546 * 1. Power on the power resources required for the wakeup device
547 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
548 * State Wake) for the device, if present
549 */
550int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
551{
552    int i, err = 0;
553
554    if (!dev || !dev->wakeup.flags.valid)
555        return -EINVAL;
556
557    mutex_lock(&acpi_device_lock);
558
559    if (dev->wakeup.prepare_count++)
560        goto out;
561
562    /* Open power resource */
563    for (i = 0; i < dev->wakeup.resources.count; i++) {
564        int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
565        if (ret) {
566            printk(KERN_ERR PREFIX "Transition power state\n");
567            dev->wakeup.flags.valid = 0;
568            err = -ENODEV;
569            goto err_out;
570        }
571    }
572
573    /*
574     * Passing 3 as the third argument below means the device may be placed
575     * in arbitrary power state afterwards.
576     */
577    err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
578
579 err_out:
580    if (err)
581        dev->wakeup.prepare_count = 0;
582
583 out:
584    mutex_unlock(&acpi_device_lock);
585    return err;
586}
587
588/*
589 * Shutdown a wakeup device, counterpart of above method
590 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
591 * State Wake) for the device, if present
592 * 2. Shutdown down the power resources
593 */
594int acpi_disable_wakeup_device_power(struct acpi_device *dev)
595{
596    int i, err = 0;
597
598    if (!dev || !dev->wakeup.flags.valid)
599        return -EINVAL;
600
601    mutex_lock(&acpi_device_lock);
602
603    if (--dev->wakeup.prepare_count > 0)
604        goto out;
605
606    /*
607     * Executing the code below even if prepare_count is already zero when
608     * the function is called may be useful, for example for initialisation.
609     */
610    if (dev->wakeup.prepare_count < 0)
611        dev->wakeup.prepare_count = 0;
612
613    err = acpi_device_sleep_wake(dev, 0, 0, 0);
614    if (err)
615        goto out;
616
617    /* Close power resource */
618    for (i = 0; i < dev->wakeup.resources.count; i++) {
619        int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
620        if (ret) {
621            printk(KERN_ERR PREFIX "Transition power state\n");
622            dev->wakeup.flags.valid = 0;
623            err = -ENODEV;
624            goto out;
625        }
626    }
627
628 out:
629    mutex_unlock(&acpi_device_lock);
630    return err;
631}
632
633/* --------------------------------------------------------------------------
634                             Device Power Management
635   -------------------------------------------------------------------------- */
636
637int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
638{
639    int result = 0;
640    struct acpi_handle_list *list = NULL;
641    int list_state = 0;
642    int i = 0;
643
644    if (!device || !state)
645        return -EINVAL;
646
647    /*
648     * We know a device's inferred power state when all the resources
649     * required for a given D-state are 'on'.
650     */
651    for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
652        list = &device->power.states[i].resources;
653        if (list->count < 1)
654            continue;
655
656        result = acpi_power_get_list_state(list, &list_state);
657        if (result)
658            return result;
659
660        if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
661            *state = i;
662            return 0;
663        }
664    }
665
666    *state = ACPI_STATE_D3;
667    return 0;
668}
669
670int acpi_power_on_resources(struct acpi_device *device, int state)
671{
672    if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
673        return -EINVAL;
674
675    return acpi_power_on_list(&device->power.states[state].resources);
676}
677
678int acpi_power_transition(struct acpi_device *device, int state)
679{
680    int result = 0;
681
682    if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
683        return -EINVAL;
684
685    if (device->power.state == state)
686        return 0;
687
688    if ((device->power.state < ACPI_STATE_D0)
689        || (device->power.state > ACPI_STATE_D3_COLD))
690        return -ENODEV;
691
692    /* TBD: Resources must be ordered. */
693
694    /*
695     * First we reference all power resources required in the target list
696     * (e.g. so the device doesn't lose power while transitioning). Then,
697     * we dereference all power resources used in the current list.
698     */
699    if (state < ACPI_STATE_D3_COLD)
700        result = acpi_power_on_list(
701            &device->power.states[state].resources);
702
703    if (!result && device->power.state < ACPI_STATE_D3_COLD)
704        acpi_power_off_list(
705            &device->power.states[device->power.state].resources);
706
707    /* We shouldn't change the state unless the above operations succeed. */
708    device->power.state = result ? ACPI_STATE_UNKNOWN : state;
709
710    return result;
711}
712
713/* --------------------------------------------------------------------------
714                                Driver Interface
715   -------------------------------------------------------------------------- */
716
717static int acpi_power_add(struct acpi_device *device)
718{
719    int result = 0, state;
720    acpi_status status = AE_OK;
721    struct acpi_power_resource *resource = NULL;
722    union acpi_object acpi_object;
723    struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
724
725
726    if (!device)
727        return -EINVAL;
728
729    resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
730    if (!resource)
731        return -ENOMEM;
732
733    resource->device = device;
734    mutex_init(&resource->resource_lock);
735    mutex_init(&resource->devices_lock);
736    strcpy(resource->name, device->pnp.bus_id);
737    strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
738    strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
739    device->driver_data = resource;
740
741    /* Evalute the object to get the system level and resource order. */
742    status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
743    if (ACPI_FAILURE(status)) {
744        result = -ENODEV;
745        goto end;
746    }
747    resource->system_level = acpi_object.power_resource.system_level;
748    resource->order = acpi_object.power_resource.resource_order;
749
750    result = acpi_power_get_state(device->handle, &state);
751    if (result)
752        goto end;
753
754    switch (state) {
755    case ACPI_POWER_RESOURCE_STATE_ON:
756        device->power.state = ACPI_STATE_D0;
757        break;
758    case ACPI_POWER_RESOURCE_STATE_OFF:
759        device->power.state = ACPI_STATE_D3;
760        break;
761    default:
762        device->power.state = ACPI_STATE_UNKNOWN;
763        break;
764    }
765
766    printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
767           acpi_device_bid(device), state ? "on" : "off");
768
769      end:
770    if (result)
771        kfree(resource);
772
773    return result;
774}
775
776static int acpi_power_remove(struct acpi_device *device, int type)
777{
778    struct acpi_power_resource *resource;
779
780    if (!device)
781        return -EINVAL;
782
783    resource = acpi_driver_data(device);
784    if (!resource)
785        return -EINVAL;
786
787    kfree(resource);
788
789    return 0;
790}
791
792#ifdef CONFIG_PM_SLEEP
793static int acpi_power_resume(struct device *dev)
794{
795    int result = 0, state;
796    struct acpi_device *device;
797    struct acpi_power_resource *resource;
798
799    if (!dev)
800        return -EINVAL;
801
802    device = to_acpi_device(dev);
803    resource = acpi_driver_data(device);
804    if (!resource)
805        return -EINVAL;
806
807    mutex_lock(&resource->resource_lock);
808
809    result = acpi_power_get_state(device->handle, &state);
810    if (result)
811        goto unlock;
812
813    if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
814        result = __acpi_power_on(resource);
815
816 unlock:
817    mutex_unlock(&resource->resource_lock);
818
819    return result;
820}
821#endif
822
823int __init acpi_power_init(void)
824{
825    INIT_LIST_HEAD(&acpi_power_resource_list);
826    return acpi_bus_register_driver(&acpi_power_driver);
827}
828

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