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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 <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
45#include "sleep.h"
46
47#define PREFIX "ACPI: "
48
49#define _COMPONENT ACPI_POWER_COMPONENT
50ACPI_MODULE_NAME("power");
51#define ACPI_POWER_CLASS "power_resource"
52#define ACPI_POWER_DEVICE_NAME "Power Resource"
53#define ACPI_POWER_FILE_INFO "info"
54#define ACPI_POWER_FILE_STATUS "state"
55#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
56#define ACPI_POWER_RESOURCE_STATE_ON 0x01
57#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
58
59static int acpi_power_add(struct acpi_device *device);
60static int acpi_power_remove(struct acpi_device *device, int type);
61static int acpi_power_resume(struct acpi_device *device);
62
63static const struct acpi_device_id power_device_ids[] = {
64 {ACPI_POWER_HID, 0},
65 {"", 0},
66};
67MODULE_DEVICE_TABLE(acpi, power_device_ids);
68
69static struct acpi_driver acpi_power_driver = {
70 .name = "power",
71 .class = ACPI_POWER_CLASS,
72 .ids = power_device_ids,
73 .ops = {
74 .add = acpi_power_add,
75 .remove = acpi_power_remove,
76 .resume = acpi_power_resume,
77 },
78};
79
80struct acpi_power_resource {
81 struct acpi_device * device;
82 acpi_bus_id name;
83 u32 system_level;
84 u32 order;
85 unsigned int ref_count;
86 struct mutex resource_lock;
87};
88
89static struct list_head acpi_power_resource_list;
90
91/* --------------------------------------------------------------------------
92 Power Resource Management
93 -------------------------------------------------------------------------- */
94
95static int
96acpi_power_get_context(acpi_handle handle,
97 struct acpi_power_resource **resource)
98{
99 int result = 0;
100 struct acpi_device *device = NULL;
101
102
103 if (!resource)
104 return -ENODEV;
105
106 result = acpi_bus_get_device(handle, &device);
107 if (result) {
108 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
109 return result;
110 }
111
112 *resource = acpi_driver_data(device);
113 if (!*resource)
114 return -ENODEV;
115
116 return 0;
117}
118
119static int acpi_power_get_state(acpi_handle handle, int *state)
120{
121 acpi_status status = AE_OK;
122 unsigned long long sta = 0;
123 char node_name[5];
124 struct acpi_buffer buffer = { sizeof(node_name), node_name };
125
126
127 if (!handle || !state)
128 return -EINVAL;
129
130 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
131 if (ACPI_FAILURE(status))
132 return -ENODEV;
133
134 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
135 ACPI_POWER_RESOURCE_STATE_OFF;
136
137 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
138
139 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
140 node_name,
141 *state ? "on" : "off"));
142
143 return 0;
144}
145
146static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
147{
148 int cur_state;
149 int i = 0;
150
151 if (!list || !state)
152 return -EINVAL;
153
154 /* The state of the list is 'on' IFF all resources are 'on'. */
155
156 for (i = 0; i < list->count; i++) {
157 struct acpi_power_resource *resource;
158 acpi_handle handle = list->handles[i];
159 int result;
160
161 result = acpi_power_get_context(handle, &resource);
162 if (result)
163 return result;
164
165 mutex_lock(&resource->resource_lock);
166
167 result = acpi_power_get_state(handle, &cur_state);
168
169 mutex_unlock(&resource->resource_lock);
170
171 if (result)
172 return result;
173
174 if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
175 break;
176 }
177
178 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
179 cur_state ? "on" : "off"));
180
181 *state = cur_state;
182
183 return 0;
184}
185
186static int __acpi_power_on(struct acpi_power_resource *resource)
187{
188 acpi_status status = AE_OK;
189
190 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
191 if (ACPI_FAILURE(status))
192 return -ENODEV;
193
194 /* Update the power resource's _device_ power state */
195 resource->device->power.state = ACPI_STATE_D0;
196
197 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
198 resource->name));
199
200 return 0;
201}
202
203static int acpi_power_on(acpi_handle handle)
204{
205 int result = 0;
206 struct acpi_power_resource *resource = NULL;
207
208 result = acpi_power_get_context(handle, &resource);
209 if (result)
210 return result;
211
212 mutex_lock(&resource->resource_lock);
213
214 if (resource->ref_count++) {
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216 "Power resource [%s] already on",
217 resource->name));
218 } else {
219 result = __acpi_power_on(resource);
220 if (result)
221 resource->ref_count--;
222 }
223
224 mutex_unlock(&resource->resource_lock);
225
226 return result;
227}
228
229static int acpi_power_off(acpi_handle handle)
230{
231 int result = 0;
232 acpi_status status = AE_OK;
233 struct acpi_power_resource *resource = NULL;
234
235 result = acpi_power_get_context(handle, &resource);
236 if (result)
237 return result;
238
239 mutex_lock(&resource->resource_lock);
240
241 if (!resource->ref_count) {
242 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
243 "Power resource [%s] already off",
244 resource->name));
245 goto unlock;
246 }
247
248 if (--resource->ref_count) {
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250 "Power resource [%s] still in use\n",
251 resource->name));
252 goto unlock;
253 }
254
255 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
256 if (ACPI_FAILURE(status)) {
257 result = -ENODEV;
258 } else {
259 /* Update the power resource's _device_ power state */
260 resource->device->power.state = ACPI_STATE_D3;
261
262 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
263 "Power resource [%s] turned off\n",
264 resource->name));
265 }
266
267 unlock:
268 mutex_unlock(&resource->resource_lock);
269
270 return result;
271}
272
273static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
274{
275 int i;
276
277 for (i = num_res - 1; i >= 0 ; i--)
278 acpi_power_off(list->handles[i]);
279}
280
281static void acpi_power_off_list(struct acpi_handle_list *list)
282{
283 __acpi_power_off_list(list, list->count);
284}
285
286static int acpi_power_on_list(struct acpi_handle_list *list)
287{
288 int result = 0;
289 int i;
290
291 for (i = 0; i < list->count; i++) {
292 result = acpi_power_on(list->handles[i]);
293 if (result) {
294 __acpi_power_off_list(list, i);
295 break;
296 }
297 }
298
299 return result;
300}
301
302/**
303 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
304 * ACPI 3.0) _PSW (Power State Wake)
305 * @dev: Device to handle.
306 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
307 * @sleep_state: Target sleep state of the system.
308 * @dev_state: Target power state of the device.
309 *
310 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
311 * State Wake) for the device, if present. On failure reset the device's
312 * wakeup.flags.valid flag.
313 *
314 * RETURN VALUE:
315 * 0 if either _DSW or _PSW has been successfully executed
316 * 0 if neither _DSW nor _PSW has been found
317 * -ENODEV if the execution of either _DSW or _PSW has failed
318 */
319int acpi_device_sleep_wake(struct acpi_device *dev,
320 int enable, int sleep_state, int dev_state)
321{
322 union acpi_object in_arg[3];
323 struct acpi_object_list arg_list = { 3, in_arg };
324 acpi_status status = AE_OK;
325
326 /*
327 * Try to execute _DSW first.
328 *
329 * Three agruments are needed for the _DSW object:
330 * Argument 0: enable/disable the wake capabilities
331 * Argument 1: target system state
332 * Argument 2: target device state
333 * When _DSW object is called to disable the wake capabilities, maybe
334 * the first argument is filled. The values of the other two agruments
335 * are meaningless.
336 */
337 in_arg[0].type = ACPI_TYPE_INTEGER;
338 in_arg[0].integer.value = enable;
339 in_arg[1].type = ACPI_TYPE_INTEGER;
340 in_arg[1].integer.value = sleep_state;
341 in_arg[2].type = ACPI_TYPE_INTEGER;
342 in_arg[2].integer.value = dev_state;
343 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
344 if (ACPI_SUCCESS(status)) {
345 return 0;
346 } else if (status != AE_NOT_FOUND) {
347 printk(KERN_ERR PREFIX "_DSW execution failed\n");
348 dev->wakeup.flags.valid = 0;
349 return -ENODEV;
350 }
351
352 /* Execute _PSW */
353 arg_list.count = 1;
354 in_arg[0].integer.value = enable;
355 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
356 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
357 printk(KERN_ERR PREFIX "_PSW execution failed\n");
358 dev->wakeup.flags.valid = 0;
359 return -ENODEV;
360 }
361
362 return 0;
363}
364
365/*
366 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
367 * 1. Power on the power resources required for the wakeup device
368 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
369 * State Wake) for the device, if present
370 */
371int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
372{
373 int i, err = 0;
374
375 if (!dev || !dev->wakeup.flags.valid)
376 return -EINVAL;
377
378 mutex_lock(&acpi_device_lock);
379
380 if (dev->wakeup.prepare_count++)
381 goto out;
382
383 /* Open power resource */
384 for (i = 0; i < dev->wakeup.resources.count; i++) {
385 int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
386 if (ret) {
387 printk(KERN_ERR PREFIX "Transition power state\n");
388 dev->wakeup.flags.valid = 0;
389 err = -ENODEV;
390 goto err_out;
391 }
392 }
393
394 /*
395 * Passing 3 as the third argument below means the device may be placed
396 * in arbitrary power state afterwards.
397 */
398 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
399
400 err_out:
401 if (err)
402 dev->wakeup.prepare_count = 0;
403
404 out:
405 mutex_unlock(&acpi_device_lock);
406 return err;
407}
408
409/*
410 * Shutdown a wakeup device, counterpart of above method
411 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
412 * State Wake) for the device, if present
413 * 2. Shutdown down the power resources
414 */
415int acpi_disable_wakeup_device_power(struct acpi_device *dev)
416{
417 int i, err = 0;
418
419 if (!dev || !dev->wakeup.flags.valid)
420 return -EINVAL;
421
422 mutex_lock(&acpi_device_lock);
423
424 if (--dev->wakeup.prepare_count > 0)
425 goto out;
426
427 /*
428 * Executing the code below even if prepare_count is already zero when
429 * the function is called may be useful, for example for initialisation.
430 */
431 if (dev->wakeup.prepare_count < 0)
432 dev->wakeup.prepare_count = 0;
433
434 err = acpi_device_sleep_wake(dev, 0, 0, 0);
435 if (err)
436 goto out;
437
438 /* Close power resource */
439 for (i = 0; i < dev->wakeup.resources.count; i++) {
440 int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
441 if (ret) {
442 printk(KERN_ERR PREFIX "Transition power state\n");
443 dev->wakeup.flags.valid = 0;
444 err = -ENODEV;
445 goto out;
446 }
447 }
448
449 out:
450 mutex_unlock(&acpi_device_lock);
451 return err;
452}
453
454/* --------------------------------------------------------------------------
455 Device Power Management
456 -------------------------------------------------------------------------- */
457
458int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
459{
460 int result = 0;
461 struct acpi_handle_list *list = NULL;
462 int list_state = 0;
463 int i = 0;
464
465 if (!device || !state)
466 return -EINVAL;
467
468 /*
469 * We know a device's inferred power state when all the resources
470 * required for a given D-state are 'on'.
471 */
472 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
473 list = &device->power.states[i].resources;
474 if (list->count < 1)
475 continue;
476
477 result = acpi_power_get_list_state(list, &list_state);
478 if (result)
479 return result;
480
481 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
482 *state = i;
483 return 0;
484 }
485 }
486
487 *state = ACPI_STATE_D3;
488 return 0;
489}
490
491int acpi_power_on_resources(struct acpi_device *device, int state)
492{
493 if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
494 return -EINVAL;
495
496 return acpi_power_on_list(&device->power.states[state].resources);
497}
498
499int acpi_power_transition(struct acpi_device *device, int state)
500{
501 int result;
502
503 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
504 return -EINVAL;
505
506 if (device->power.state == state)
507 return 0;
508
509 if ((device->power.state < ACPI_STATE_D0)
510 || (device->power.state > ACPI_STATE_D3))
511 return -ENODEV;
512
513 /* TBD: Resources must be ordered. */
514
515 /*
516 * First we reference all power resources required in the target list
517 * (e.g. so the device doesn't lose power while transitioning). Then,
518 * we dereference all power resources used in the current list.
519 */
520 result = acpi_power_on_list(&device->power.states[state].resources);
521 if (!result)
522 acpi_power_off_list(
523 &device->power.states[device->power.state].resources);
524
525 /* We shouldn't change the state unless the above operations succeed. */
526 device->power.state = result ? ACPI_STATE_UNKNOWN : state;
527
528 return result;
529}
530
531/* --------------------------------------------------------------------------
532 Driver Interface
533 -------------------------------------------------------------------------- */
534
535static int acpi_power_add(struct acpi_device *device)
536{
537 int result = 0, state;
538 acpi_status status = AE_OK;
539 struct acpi_power_resource *resource = NULL;
540 union acpi_object acpi_object;
541 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
542
543
544 if (!device)
545 return -EINVAL;
546
547 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
548 if (!resource)
549 return -ENOMEM;
550
551 resource->device = device;
552 mutex_init(&resource->resource_lock);
553 strcpy(resource->name, device->pnp.bus_id);
554 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
555 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
556 device->driver_data = resource;
557
558 /* Evalute the object to get the system level and resource order. */
559 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
560 if (ACPI_FAILURE(status)) {
561 result = -ENODEV;
562 goto end;
563 }
564 resource->system_level = acpi_object.power_resource.system_level;
565 resource->order = acpi_object.power_resource.resource_order;
566
567 result = acpi_power_get_state(device->handle, &state);
568 if (result)
569 goto end;
570
571 switch (state) {
572 case ACPI_POWER_RESOURCE_STATE_ON:
573 device->power.state = ACPI_STATE_D0;
574 break;
575 case ACPI_POWER_RESOURCE_STATE_OFF:
576 device->power.state = ACPI_STATE_D3;
577 break;
578 default:
579 device->power.state = ACPI_STATE_UNKNOWN;
580 break;
581 }
582
583 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
584 acpi_device_bid(device), state ? "on" : "off");
585
586 end:
587 if (result)
588 kfree(resource);
589
590 return result;
591}
592
593static int acpi_power_remove(struct acpi_device *device, int type)
594{
595 struct acpi_power_resource *resource;
596
597 if (!device)
598 return -EINVAL;
599
600 resource = acpi_driver_data(device);
601 if (!resource)
602 return -EINVAL;
603
604 kfree(resource);
605
606 return 0;
607}
608
609static int acpi_power_resume(struct acpi_device *device)
610{
611 int result = 0, state;
612 struct acpi_power_resource *resource;
613
614 if (!device)
615 return -EINVAL;
616
617 resource = acpi_driver_data(device);
618 if (!resource)
619 return -EINVAL;
620
621 mutex_lock(&resource->resource_lock);
622
623 result = acpi_power_get_state(device->handle, &state);
624 if (result)
625 goto unlock;
626
627 if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
628 result = __acpi_power_on(resource);
629
630 unlock:
631 mutex_unlock(&resource->resource_lock);
632
633 return result;
634}
635
636int __init acpi_power_init(void)
637{
638 INIT_LIST_HEAD(&acpi_power_resource_list);
639 return acpi_bus_register_driver(&acpi_power_driver);
640}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/acpi/power.c - ACPI Power Resources management.
4 *
5 * Copyright (C) 2001 - 2015 Intel Corp.
6 * Author: Andy Grover <andrew.grover@intel.com>
7 * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9 */
10
11/*
12 * ACPI power-managed devices may be controlled in two ways:
13 * 1. via "Device Specific (D-State) Control"
14 * 2. via "Power Resource Control".
15 * The code below deals with ACPI Power Resources control.
16 *
17 * An ACPI "power resource object" represents a software controllable power
18 * plane, clock plane, or other resource depended on by a device.
19 *
20 * A device may rely on multiple power resources, and a power resource
21 * may be shared by multiple devices.
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/pm_runtime.h>
30#include <linux/sysfs.h>
31#include <linux/acpi.h>
32#include "sleep.h"
33#include "internal.h"
34
35#define _COMPONENT ACPI_POWER_COMPONENT
36ACPI_MODULE_NAME("power");
37#define ACPI_POWER_CLASS "power_resource"
38#define ACPI_POWER_DEVICE_NAME "Power Resource"
39#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
40#define ACPI_POWER_RESOURCE_STATE_ON 0x01
41#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
42
43struct acpi_power_dependent_device {
44 struct device *dev;
45 struct list_head node;
46};
47
48struct acpi_power_resource {
49 struct acpi_device device;
50 struct list_head list_node;
51 char *name;
52 u32 system_level;
53 u32 order;
54 unsigned int ref_count;
55 bool wakeup_enabled;
56 struct mutex resource_lock;
57 struct list_head dependents;
58};
59
60struct acpi_power_resource_entry {
61 struct list_head node;
62 struct acpi_power_resource *resource;
63};
64
65static LIST_HEAD(acpi_power_resource_list);
66static DEFINE_MUTEX(power_resource_list_lock);
67
68/* --------------------------------------------------------------------------
69 Power Resource Management
70 -------------------------------------------------------------------------- */
71
72static inline
73struct acpi_power_resource *to_power_resource(struct acpi_device *device)
74{
75 return container_of(device, struct acpi_power_resource, device);
76}
77
78static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
79{
80 struct acpi_device *device;
81
82 if (acpi_bus_get_device(handle, &device))
83 return NULL;
84
85 return to_power_resource(device);
86}
87
88static int acpi_power_resources_list_add(acpi_handle handle,
89 struct list_head *list)
90{
91 struct acpi_power_resource *resource = acpi_power_get_context(handle);
92 struct acpi_power_resource_entry *entry;
93
94 if (!resource || !list)
95 return -EINVAL;
96
97 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
98 if (!entry)
99 return -ENOMEM;
100
101 entry->resource = resource;
102 if (!list_empty(list)) {
103 struct acpi_power_resource_entry *e;
104
105 list_for_each_entry(e, list, node)
106 if (e->resource->order > resource->order) {
107 list_add_tail(&entry->node, &e->node);
108 return 0;
109 }
110 }
111 list_add_tail(&entry->node, list);
112 return 0;
113}
114
115void acpi_power_resources_list_free(struct list_head *list)
116{
117 struct acpi_power_resource_entry *entry, *e;
118
119 list_for_each_entry_safe(entry, e, list, node) {
120 list_del(&entry->node);
121 kfree(entry);
122 }
123}
124
125static bool acpi_power_resource_is_dup(union acpi_object *package,
126 unsigned int start, unsigned int i)
127{
128 acpi_handle rhandle, dup;
129 unsigned int j;
130
131 /* The caller is expected to check the package element types */
132 rhandle = package->package.elements[i].reference.handle;
133 for (j = start; j < i; j++) {
134 dup = package->package.elements[j].reference.handle;
135 if (dup == rhandle)
136 return true;
137 }
138
139 return false;
140}
141
142int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
143 struct list_head *list)
144{
145 unsigned int i;
146 int err = 0;
147
148 for (i = start; i < package->package.count; i++) {
149 union acpi_object *element = &package->package.elements[i];
150 acpi_handle rhandle;
151
152 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
153 err = -ENODATA;
154 break;
155 }
156 rhandle = element->reference.handle;
157 if (!rhandle) {
158 err = -ENODEV;
159 break;
160 }
161
162 /* Some ACPI tables contain duplicate power resource references */
163 if (acpi_power_resource_is_dup(package, start, i))
164 continue;
165
166 err = acpi_add_power_resource(rhandle);
167 if (err)
168 break;
169
170 err = acpi_power_resources_list_add(rhandle, list);
171 if (err)
172 break;
173 }
174 if (err)
175 acpi_power_resources_list_free(list);
176
177 return err;
178}
179
180static int acpi_power_get_state(acpi_handle handle, int *state)
181{
182 acpi_status status = AE_OK;
183 unsigned long long sta = 0;
184 char node_name[5];
185 struct acpi_buffer buffer = { sizeof(node_name), node_name };
186
187
188 if (!handle || !state)
189 return -EINVAL;
190
191 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
192 if (ACPI_FAILURE(status))
193 return -ENODEV;
194
195 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
196 ACPI_POWER_RESOURCE_STATE_OFF;
197
198 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
199
200 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
201 node_name,
202 *state ? "on" : "off"));
203
204 return 0;
205}
206
207static int acpi_power_get_list_state(struct list_head *list, int *state)
208{
209 struct acpi_power_resource_entry *entry;
210 int cur_state;
211
212 if (!list || !state)
213 return -EINVAL;
214
215 /* The state of the list is 'on' IFF all resources are 'on'. */
216 cur_state = 0;
217 list_for_each_entry(entry, list, node) {
218 struct acpi_power_resource *resource = entry->resource;
219 acpi_handle handle = resource->device.handle;
220 int result;
221
222 mutex_lock(&resource->resource_lock);
223 result = acpi_power_get_state(handle, &cur_state);
224 mutex_unlock(&resource->resource_lock);
225 if (result)
226 return result;
227
228 if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
229 break;
230 }
231
232 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
233 cur_state ? "on" : "off"));
234
235 *state = cur_state;
236 return 0;
237}
238
239static int
240acpi_power_resource_add_dependent(struct acpi_power_resource *resource,
241 struct device *dev)
242{
243 struct acpi_power_dependent_device *dep;
244 int ret = 0;
245
246 mutex_lock(&resource->resource_lock);
247 list_for_each_entry(dep, &resource->dependents, node) {
248 /* Only add it once */
249 if (dep->dev == dev)
250 goto unlock;
251 }
252
253 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
254 if (!dep) {
255 ret = -ENOMEM;
256 goto unlock;
257 }
258
259 dep->dev = dev;
260 list_add_tail(&dep->node, &resource->dependents);
261 dev_dbg(dev, "added power dependency to [%s]\n", resource->name);
262
263unlock:
264 mutex_unlock(&resource->resource_lock);
265 return ret;
266}
267
268static void
269acpi_power_resource_remove_dependent(struct acpi_power_resource *resource,
270 struct device *dev)
271{
272 struct acpi_power_dependent_device *dep;
273
274 mutex_lock(&resource->resource_lock);
275 list_for_each_entry(dep, &resource->dependents, node) {
276 if (dep->dev == dev) {
277 list_del(&dep->node);
278 kfree(dep);
279 dev_dbg(dev, "removed power dependency to [%s]\n",
280 resource->name);
281 break;
282 }
283 }
284 mutex_unlock(&resource->resource_lock);
285}
286
287/**
288 * acpi_device_power_add_dependent - Add dependent device of this ACPI device
289 * @adev: ACPI device pointer
290 * @dev: Dependent device
291 *
292 * If @adev has non-empty _PR0 the @dev is added as dependent device to all
293 * power resources returned by it. This means that whenever these power
294 * resources are turned _ON the dependent devices get runtime resumed. This
295 * is needed for devices such as PCI to allow its driver to re-initialize
296 * it after it went to D0uninitialized.
297 *
298 * If @adev does not have _PR0 this does nothing.
299 *
300 * Returns %0 in case of success and negative errno otherwise.
301 */
302int acpi_device_power_add_dependent(struct acpi_device *adev,
303 struct device *dev)
304{
305 struct acpi_power_resource_entry *entry;
306 struct list_head *resources;
307 int ret;
308
309 if (!adev->flags.power_manageable)
310 return 0;
311
312 resources = &adev->power.states[ACPI_STATE_D0].resources;
313 list_for_each_entry(entry, resources, node) {
314 ret = acpi_power_resource_add_dependent(entry->resource, dev);
315 if (ret)
316 goto err;
317 }
318
319 return 0;
320
321err:
322 list_for_each_entry(entry, resources, node)
323 acpi_power_resource_remove_dependent(entry->resource, dev);
324
325 return ret;
326}
327
328/**
329 * acpi_device_power_remove_dependent - Remove dependent device
330 * @adev: ACPI device pointer
331 * @dev: Dependent device
332 *
333 * Does the opposite of acpi_device_power_add_dependent() and removes the
334 * dependent device if it is found. Can be called to @adev that does not
335 * have _PR0 as well.
336 */
337void acpi_device_power_remove_dependent(struct acpi_device *adev,
338 struct device *dev)
339{
340 struct acpi_power_resource_entry *entry;
341 struct list_head *resources;
342
343 if (!adev->flags.power_manageable)
344 return;
345
346 resources = &adev->power.states[ACPI_STATE_D0].resources;
347 list_for_each_entry_reverse(entry, resources, node)
348 acpi_power_resource_remove_dependent(entry->resource, dev);
349}
350
351static int __acpi_power_on(struct acpi_power_resource *resource)
352{
353 struct acpi_power_dependent_device *dep;
354 acpi_status status = AE_OK;
355
356 status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
357 if (ACPI_FAILURE(status))
358 return -ENODEV;
359
360 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
361 resource->name));
362
363 /*
364 * If there are other dependents on this power resource we need to
365 * resume them now so that their drivers can re-initialize the
366 * hardware properly after it went back to D0.
367 */
368 if (list_empty(&resource->dependents) ||
369 list_is_singular(&resource->dependents))
370 return 0;
371
372 list_for_each_entry(dep, &resource->dependents, node) {
373 dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n",
374 resource->name);
375 pm_request_resume(dep->dev);
376 }
377
378 return 0;
379}
380
381static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
382{
383 int result = 0;
384
385 if (resource->ref_count++) {
386 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
387 "Power resource [%s] already on\n",
388 resource->name));
389 } else {
390 result = __acpi_power_on(resource);
391 if (result)
392 resource->ref_count--;
393 }
394 return result;
395}
396
397static int acpi_power_on(struct acpi_power_resource *resource)
398{
399 int result;
400
401 mutex_lock(&resource->resource_lock);
402 result = acpi_power_on_unlocked(resource);
403 mutex_unlock(&resource->resource_lock);
404 return result;
405}
406
407static int __acpi_power_off(struct acpi_power_resource *resource)
408{
409 acpi_status status;
410
411 status = acpi_evaluate_object(resource->device.handle, "_OFF",
412 NULL, NULL);
413 if (ACPI_FAILURE(status))
414 return -ENODEV;
415
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",
417 resource->name));
418 return 0;
419}
420
421static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
422{
423 int result = 0;
424
425 if (!resource->ref_count) {
426 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
427 "Power resource [%s] already off\n",
428 resource->name));
429 return 0;
430 }
431
432 if (--resource->ref_count) {
433 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
434 "Power resource [%s] still in use\n",
435 resource->name));
436 } else {
437 result = __acpi_power_off(resource);
438 if (result)
439 resource->ref_count++;
440 }
441 return result;
442}
443
444static int acpi_power_off(struct acpi_power_resource *resource)
445{
446 int result;
447
448 mutex_lock(&resource->resource_lock);
449 result = acpi_power_off_unlocked(resource);
450 mutex_unlock(&resource->resource_lock);
451 return result;
452}
453
454static int acpi_power_off_list(struct list_head *list)
455{
456 struct acpi_power_resource_entry *entry;
457 int result = 0;
458
459 list_for_each_entry_reverse(entry, list, node) {
460 result = acpi_power_off(entry->resource);
461 if (result)
462 goto err;
463 }
464 return 0;
465
466 err:
467 list_for_each_entry_continue(entry, list, node)
468 acpi_power_on(entry->resource);
469
470 return result;
471}
472
473static int acpi_power_on_list(struct list_head *list)
474{
475 struct acpi_power_resource_entry *entry;
476 int result = 0;
477
478 list_for_each_entry(entry, list, node) {
479 result = acpi_power_on(entry->resource);
480 if (result)
481 goto err;
482 }
483 return 0;
484
485 err:
486 list_for_each_entry_continue_reverse(entry, list, node)
487 acpi_power_off(entry->resource);
488
489 return result;
490}
491
492static struct attribute *attrs[] = {
493 NULL,
494};
495
496static const struct attribute_group attr_groups[] = {
497 [ACPI_STATE_D0] = {
498 .name = "power_resources_D0",
499 .attrs = attrs,
500 },
501 [ACPI_STATE_D1] = {
502 .name = "power_resources_D1",
503 .attrs = attrs,
504 },
505 [ACPI_STATE_D2] = {
506 .name = "power_resources_D2",
507 .attrs = attrs,
508 },
509 [ACPI_STATE_D3_HOT] = {
510 .name = "power_resources_D3hot",
511 .attrs = attrs,
512 },
513};
514
515static const struct attribute_group wakeup_attr_group = {
516 .name = "power_resources_wakeup",
517 .attrs = attrs,
518};
519
520static void acpi_power_hide_list(struct acpi_device *adev,
521 struct list_head *resources,
522 const struct attribute_group *attr_group)
523{
524 struct acpi_power_resource_entry *entry;
525
526 if (list_empty(resources))
527 return;
528
529 list_for_each_entry_reverse(entry, resources, node) {
530 struct acpi_device *res_dev = &entry->resource->device;
531
532 sysfs_remove_link_from_group(&adev->dev.kobj,
533 attr_group->name,
534 dev_name(&res_dev->dev));
535 }
536 sysfs_remove_group(&adev->dev.kobj, attr_group);
537}
538
539static void acpi_power_expose_list(struct acpi_device *adev,
540 struct list_head *resources,
541 const struct attribute_group *attr_group)
542{
543 struct acpi_power_resource_entry *entry;
544 int ret;
545
546 if (list_empty(resources))
547 return;
548
549 ret = sysfs_create_group(&adev->dev.kobj, attr_group);
550 if (ret)
551 return;
552
553 list_for_each_entry(entry, resources, node) {
554 struct acpi_device *res_dev = &entry->resource->device;
555
556 ret = sysfs_add_link_to_group(&adev->dev.kobj,
557 attr_group->name,
558 &res_dev->dev.kobj,
559 dev_name(&res_dev->dev));
560 if (ret) {
561 acpi_power_hide_list(adev, resources, attr_group);
562 break;
563 }
564 }
565}
566
567static void acpi_power_expose_hide(struct acpi_device *adev,
568 struct list_head *resources,
569 const struct attribute_group *attr_group,
570 bool expose)
571{
572 if (expose)
573 acpi_power_expose_list(adev, resources, attr_group);
574 else
575 acpi_power_hide_list(adev, resources, attr_group);
576}
577
578void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
579{
580 int state;
581
582 if (adev->wakeup.flags.valid)
583 acpi_power_expose_hide(adev, &adev->wakeup.resources,
584 &wakeup_attr_group, add);
585
586 if (!adev->power.flags.power_resources)
587 return;
588
589 for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
590 acpi_power_expose_hide(adev,
591 &adev->power.states[state].resources,
592 &attr_groups[state], add);
593}
594
595int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
596{
597 struct acpi_power_resource_entry *entry;
598 int system_level = 5;
599
600 list_for_each_entry(entry, list, node) {
601 struct acpi_power_resource *resource = entry->resource;
602 acpi_handle handle = resource->device.handle;
603 int result;
604 int state;
605
606 mutex_lock(&resource->resource_lock);
607
608 result = acpi_power_get_state(handle, &state);
609 if (result) {
610 mutex_unlock(&resource->resource_lock);
611 return result;
612 }
613 if (state == ACPI_POWER_RESOURCE_STATE_ON) {
614 resource->ref_count++;
615 resource->wakeup_enabled = true;
616 }
617 if (system_level > resource->system_level)
618 system_level = resource->system_level;
619
620 mutex_unlock(&resource->resource_lock);
621 }
622 *system_level_p = system_level;
623 return 0;
624}
625
626/* --------------------------------------------------------------------------
627 Device Power Management
628 -------------------------------------------------------------------------- */
629
630/**
631 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
632 * ACPI 3.0) _PSW (Power State Wake)
633 * @dev: Device to handle.
634 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
635 * @sleep_state: Target sleep state of the system.
636 * @dev_state: Target power state of the device.
637 *
638 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
639 * State Wake) for the device, if present. On failure reset the device's
640 * wakeup.flags.valid flag.
641 *
642 * RETURN VALUE:
643 * 0 if either _DSW or _PSW has been successfully executed
644 * 0 if neither _DSW nor _PSW has been found
645 * -ENODEV if the execution of either _DSW or _PSW has failed
646 */
647int acpi_device_sleep_wake(struct acpi_device *dev,
648 int enable, int sleep_state, int dev_state)
649{
650 union acpi_object in_arg[3];
651 struct acpi_object_list arg_list = { 3, in_arg };
652 acpi_status status = AE_OK;
653
654 /*
655 * Try to execute _DSW first.
656 *
657 * Three arguments are needed for the _DSW object:
658 * Argument 0: enable/disable the wake capabilities
659 * Argument 1: target system state
660 * Argument 2: target device state
661 * When _DSW object is called to disable the wake capabilities, maybe
662 * the first argument is filled. The values of the other two arguments
663 * are meaningless.
664 */
665 in_arg[0].type = ACPI_TYPE_INTEGER;
666 in_arg[0].integer.value = enable;
667 in_arg[1].type = ACPI_TYPE_INTEGER;
668 in_arg[1].integer.value = sleep_state;
669 in_arg[2].type = ACPI_TYPE_INTEGER;
670 in_arg[2].integer.value = dev_state;
671 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
672 if (ACPI_SUCCESS(status)) {
673 return 0;
674 } else if (status != AE_NOT_FOUND) {
675 printk(KERN_ERR PREFIX "_DSW execution failed\n");
676 dev->wakeup.flags.valid = 0;
677 return -ENODEV;
678 }
679
680 /* Execute _PSW */
681 status = acpi_execute_simple_method(dev->handle, "_PSW", enable);
682 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
683 printk(KERN_ERR PREFIX "_PSW execution failed\n");
684 dev->wakeup.flags.valid = 0;
685 return -ENODEV;
686 }
687
688 return 0;
689}
690
691/*
692 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
693 * 1. Power on the power resources required for the wakeup device
694 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
695 * State Wake) for the device, if present
696 */
697int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
698{
699 struct acpi_power_resource_entry *entry;
700 int err = 0;
701
702 if (!dev || !dev->wakeup.flags.valid)
703 return -EINVAL;
704
705 mutex_lock(&acpi_device_lock);
706
707 if (dev->wakeup.prepare_count++)
708 goto out;
709
710 list_for_each_entry(entry, &dev->wakeup.resources, node) {
711 struct acpi_power_resource *resource = entry->resource;
712
713 mutex_lock(&resource->resource_lock);
714
715 if (!resource->wakeup_enabled) {
716 err = acpi_power_on_unlocked(resource);
717 if (!err)
718 resource->wakeup_enabled = true;
719 }
720
721 mutex_unlock(&resource->resource_lock);
722
723 if (err) {
724 dev_err(&dev->dev,
725 "Cannot turn wakeup power resources on\n");
726 dev->wakeup.flags.valid = 0;
727 goto out;
728 }
729 }
730 /*
731 * Passing 3 as the third argument below means the device may be
732 * put into arbitrary power state afterward.
733 */
734 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
735 if (err)
736 dev->wakeup.prepare_count = 0;
737
738 out:
739 mutex_unlock(&acpi_device_lock);
740 return err;
741}
742
743/*
744 * Shutdown a wakeup device, counterpart of above method
745 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
746 * State Wake) for the device, if present
747 * 2. Shutdown down the power resources
748 */
749int acpi_disable_wakeup_device_power(struct acpi_device *dev)
750{
751 struct acpi_power_resource_entry *entry;
752 int err = 0;
753
754 if (!dev || !dev->wakeup.flags.valid)
755 return -EINVAL;
756
757 mutex_lock(&acpi_device_lock);
758
759 if (--dev->wakeup.prepare_count > 0)
760 goto out;
761
762 /*
763 * Executing the code below even if prepare_count is already zero when
764 * the function is called may be useful, for example for initialisation.
765 */
766 if (dev->wakeup.prepare_count < 0)
767 dev->wakeup.prepare_count = 0;
768
769 err = acpi_device_sleep_wake(dev, 0, 0, 0);
770 if (err)
771 goto out;
772
773 list_for_each_entry(entry, &dev->wakeup.resources, node) {
774 struct acpi_power_resource *resource = entry->resource;
775
776 mutex_lock(&resource->resource_lock);
777
778 if (resource->wakeup_enabled) {
779 err = acpi_power_off_unlocked(resource);
780 if (!err)
781 resource->wakeup_enabled = false;
782 }
783
784 mutex_unlock(&resource->resource_lock);
785
786 if (err) {
787 dev_err(&dev->dev,
788 "Cannot turn wakeup power resources off\n");
789 dev->wakeup.flags.valid = 0;
790 break;
791 }
792 }
793
794 out:
795 mutex_unlock(&acpi_device_lock);
796 return err;
797}
798
799int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
800{
801 int result = 0;
802 int list_state = 0;
803 int i = 0;
804
805 if (!device || !state)
806 return -EINVAL;
807
808 /*
809 * We know a device's inferred power state when all the resources
810 * required for a given D-state are 'on'.
811 */
812 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
813 struct list_head *list = &device->power.states[i].resources;
814
815 if (list_empty(list))
816 continue;
817
818 result = acpi_power_get_list_state(list, &list_state);
819 if (result)
820 return result;
821
822 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
823 *state = i;
824 return 0;
825 }
826 }
827
828 *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ?
829 ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT;
830 return 0;
831}
832
833int acpi_power_on_resources(struct acpi_device *device, int state)
834{
835 if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
836 return -EINVAL;
837
838 return acpi_power_on_list(&device->power.states[state].resources);
839}
840
841int acpi_power_transition(struct acpi_device *device, int state)
842{
843 int result = 0;
844
845 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
846 return -EINVAL;
847
848 if (device->power.state == state || !device->flags.power_manageable)
849 return 0;
850
851 if ((device->power.state < ACPI_STATE_D0)
852 || (device->power.state > ACPI_STATE_D3_COLD))
853 return -ENODEV;
854
855 /*
856 * First we reference all power resources required in the target list
857 * (e.g. so the device doesn't lose power while transitioning). Then,
858 * we dereference all power resources used in the current list.
859 */
860 if (state < ACPI_STATE_D3_COLD)
861 result = acpi_power_on_list(
862 &device->power.states[state].resources);
863
864 if (!result && device->power.state < ACPI_STATE_D3_COLD)
865 acpi_power_off_list(
866 &device->power.states[device->power.state].resources);
867
868 /* We shouldn't change the state unless the above operations succeed. */
869 device->power.state = result ? ACPI_STATE_UNKNOWN : state;
870
871 return result;
872}
873
874static void acpi_release_power_resource(struct device *dev)
875{
876 struct acpi_device *device = to_acpi_device(dev);
877 struct acpi_power_resource *resource;
878
879 resource = container_of(device, struct acpi_power_resource, device);
880
881 mutex_lock(&power_resource_list_lock);
882 list_del(&resource->list_node);
883 mutex_unlock(&power_resource_list_lock);
884
885 acpi_free_pnp_ids(&device->pnp);
886 kfree(resource);
887}
888
889static ssize_t acpi_power_in_use_show(struct device *dev,
890 struct device_attribute *attr,
891 char *buf) {
892 struct acpi_power_resource *resource;
893
894 resource = to_power_resource(to_acpi_device(dev));
895 return sprintf(buf, "%u\n", !!resource->ref_count);
896}
897static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);
898
899static void acpi_power_sysfs_remove(struct acpi_device *device)
900{
901 device_remove_file(&device->dev, &dev_attr_resource_in_use);
902}
903
904static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource)
905{
906 mutex_lock(&power_resource_list_lock);
907
908 if (!list_empty(&acpi_power_resource_list)) {
909 struct acpi_power_resource *r;
910
911 list_for_each_entry(r, &acpi_power_resource_list, list_node)
912 if (r->order > resource->order) {
913 list_add_tail(&resource->list_node, &r->list_node);
914 goto out;
915 }
916 }
917 list_add_tail(&resource->list_node, &acpi_power_resource_list);
918
919 out:
920 mutex_unlock(&power_resource_list_lock);
921}
922
923int acpi_add_power_resource(acpi_handle handle)
924{
925 struct acpi_power_resource *resource;
926 struct acpi_device *device = NULL;
927 union acpi_object acpi_object;
928 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
929 acpi_status status;
930 int state, result = -ENODEV;
931
932 acpi_bus_get_device(handle, &device);
933 if (device)
934 return 0;
935
936 resource = kzalloc(sizeof(*resource), GFP_KERNEL);
937 if (!resource)
938 return -ENOMEM;
939
940 device = &resource->device;
941 acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
942 ACPI_STA_DEFAULT);
943 mutex_init(&resource->resource_lock);
944 INIT_LIST_HEAD(&resource->list_node);
945 INIT_LIST_HEAD(&resource->dependents);
946 resource->name = device->pnp.bus_id;
947 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
948 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
949 device->power.state = ACPI_STATE_UNKNOWN;
950
951 /* Evalute the object to get the system level and resource order. */
952 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
953 if (ACPI_FAILURE(status))
954 goto err;
955
956 resource->system_level = acpi_object.power_resource.system_level;
957 resource->order = acpi_object.power_resource.resource_order;
958
959 result = acpi_power_get_state(handle, &state);
960 if (result)
961 goto err;
962
963 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
964 acpi_device_bid(device), state ? "on" : "off");
965
966 device->flags.match_driver = true;
967 result = acpi_device_add(device, acpi_release_power_resource);
968 if (result)
969 goto err;
970
971 if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
972 device->remove = acpi_power_sysfs_remove;
973
974 acpi_power_add_resource_to_list(resource);
975 acpi_device_add_finalize(device);
976 return 0;
977
978 err:
979 acpi_release_power_resource(&device->dev);
980 return result;
981}
982
983#ifdef CONFIG_ACPI_SLEEP
984void acpi_resume_power_resources(void)
985{
986 struct acpi_power_resource *resource;
987
988 mutex_lock(&power_resource_list_lock);
989
990 list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
991 int result, state;
992
993 mutex_lock(&resource->resource_lock);
994
995 result = acpi_power_get_state(resource->device.handle, &state);
996 if (result) {
997 mutex_unlock(&resource->resource_lock);
998 continue;
999 }
1000
1001 if (state == ACPI_POWER_RESOURCE_STATE_OFF
1002 && resource->ref_count) {
1003 dev_info(&resource->device.dev, "Turning ON\n");
1004 __acpi_power_on(resource);
1005 }
1006
1007 mutex_unlock(&resource->resource_lock);
1008 }
1009
1010 mutex_unlock(&power_resource_list_lock);
1011}
1012
1013void acpi_turn_off_unused_power_resources(void)
1014{
1015 struct acpi_power_resource *resource;
1016
1017 mutex_lock(&power_resource_list_lock);
1018
1019 list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
1020 int result, state;
1021
1022 mutex_lock(&resource->resource_lock);
1023
1024 result = acpi_power_get_state(resource->device.handle, &state);
1025 if (result) {
1026 mutex_unlock(&resource->resource_lock);
1027 continue;
1028 }
1029
1030 if (state == ACPI_POWER_RESOURCE_STATE_ON
1031 && !resource->ref_count) {
1032 dev_info(&resource->device.dev, "Turning OFF\n");
1033 __acpi_power_off(resource);
1034 }
1035
1036 mutex_unlock(&resource->resource_lock);
1037 }
1038
1039 mutex_unlock(&power_resource_list_lock);
1040}
1041#endif