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1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
11 | * This will intialize the embedded device_pm_info object in the device | |
12 | * and add it to the list of power-controlled devices. sysfs entries for | |
13 | * controlling device power management will also be added. | |
14 | * | |
15 | * A different set of lists than the global subsystem list are used to | |
16 | * keep track of power info because we use different lists to hold | |
17 | * devices based on what stage of the power management process they | |
18 | * are in. The power domain dependencies may also differ from the | |
19 | * ancestral dependencies that the subsystem list maintains. | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/device.h> |
23 | #include "power.h" | |
24 | ||
25 | LIST_HEAD(dpm_active); | |
26 | LIST_HEAD(dpm_off); | |
27 | LIST_HEAD(dpm_off_irq); | |
28 | ||
29 | DECLARE_MUTEX(dpm_sem); | |
30 | DECLARE_MUTEX(dpm_list_sem); | |
31 | ||
075c1771 DB |
32 | int (*platform_enable_wakeup)(struct device *dev, int is_on); |
33 | ||
34 | ||
1da177e4 LT |
35 | /** |
36 | * device_pm_set_parent - Specify power dependency. | |
37 | * @dev: Device who needs power. | |
38 | * @parent: Device that supplies power. | |
39 | * | |
40 | * This function is used to manually describe a power-dependency | |
41 | * relationship. It may be used to specify a transversal relationship | |
42 | * (where the power supplier is not the physical (or electrical) | |
43 | * ancestor of a specific device. | |
44 | * The effect of this is that the supplier will not be powered down | |
45 | * before the power dependent. | |
46 | */ | |
47 | ||
48 | void device_pm_set_parent(struct device * dev, struct device * parent) | |
49 | { | |
e9b7bd4e DB |
50 | put_device(dev->power.pm_parent); |
51 | dev->power.pm_parent = get_device(parent); | |
1da177e4 LT |
52 | } |
53 | EXPORT_SYMBOL_GPL(device_pm_set_parent); | |
54 | ||
55 | int device_pm_add(struct device * dev) | |
56 | { | |
57 | int error; | |
58 | ||
59 | pr_debug("PM: Adding info for %s:%s\n", | |
c48ea603 DT |
60 | dev->bus ? dev->bus->name : "No Bus", |
61 | kobject_name(&dev->kobj)); | |
1da177e4 LT |
62 | down(&dpm_list_sem); |
63 | list_add_tail(&dev->power.entry, &dpm_active); | |
64 | device_pm_set_parent(dev, dev->parent); | |
65 | if ((error = dpm_sysfs_add(dev))) | |
66 | list_del(&dev->power.entry); | |
67 | up(&dpm_list_sem); | |
68 | return error; | |
69 | } | |
70 | ||
71 | void device_pm_remove(struct device * dev) | |
72 | { | |
73 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
74 | dev->bus ? dev->bus->name : "No Bus", |
75 | kobject_name(&dev->kobj)); | |
1da177e4 LT |
76 | down(&dpm_list_sem); |
77 | dpm_sysfs_remove(dev); | |
e9b7bd4e | 78 | put_device(dev->power.pm_parent); |
1da177e4 LT |
79 | list_del_init(&dev->power.entry); |
80 | up(&dpm_list_sem); | |
81 | } | |
82 | ||
83 |