[PATCH] PCI: Unhide SMBus on Compaq Evo N620c
[linux-2.6] / drivers / base / power / resume.c
1 /*
2  * resume.c - Functions for waking devices up.
3  *
4  * Copyright (c) 2003 Patrick Mochel
5  * Copyright (c) 2003 Open Source Development Labs
6  *
7  * This file is released under the GPLv2
8  *
9  */
10
11 #include <linux/device.h>
12 #include "power.h"
13
14 extern int sysdev_resume(void);
15
16
17 /**
18  *      resume_device - Restore state for one device.
19  *      @dev:   Device.
20  *
21  */
22
23 int resume_device(struct device * dev)
24 {
25         int error = 0;
26
27         down(&dev->sem);
28         if (dev->power.pm_parent
29                         && dev->power.pm_parent->power.power_state.event) {
30                 dev_err(dev, "PM: resume from %d, parent %s still %d\n",
31                         dev->power.power_state.event,
32                         dev->power.pm_parent->bus_id,
33                         dev->power.pm_parent->power.power_state.event);
34         }
35         if (dev->bus && dev->bus->resume) {
36                 dev_dbg(dev,"resuming\n");
37                 error = dev->bus->resume(dev);
38         }
39         up(&dev->sem);
40         return error;
41 }
42
43
44
45 void dpm_resume(void)
46 {
47         down(&dpm_list_sem);
48         while(!list_empty(&dpm_off)) {
49                 struct list_head * entry = dpm_off.next;
50                 struct device * dev = to_device(entry);
51
52                 get_device(dev);
53                 list_del_init(entry);
54                 list_add_tail(entry, &dpm_active);
55
56                 up(&dpm_list_sem);
57                 if (!dev->power.prev_state.event)
58                         resume_device(dev);
59                 down(&dpm_list_sem);
60                 put_device(dev);
61         }
62         up(&dpm_list_sem);
63 }
64
65
66 /**
67  *      device_resume - Restore state of each device in system.
68  *
69  *      Walk the dpm_off list, remove each entry, resume the device,
70  *      then add it to the dpm_active list.
71  */
72
73 void device_resume(void)
74 {
75         down(&dpm_sem);
76         dpm_resume();
77         up(&dpm_sem);
78 }
79
80 EXPORT_SYMBOL_GPL(device_resume);
81
82
83 /**
84  *      device_power_up_irq - Power on some devices.
85  *
86  *      Walk the dpm_off_irq list and power each device up. This
87  *      is used for devices that required they be powered down with
88  *      interrupts disabled. As devices are powered on, they are moved to
89  *      the dpm_suspended list.
90  *
91  *      Interrupts must be disabled when calling this.
92  */
93
94 void dpm_power_up(void)
95 {
96         while(!list_empty(&dpm_off_irq)) {
97                 struct list_head * entry = dpm_off_irq.next;
98                 struct device * dev = to_device(entry);
99
100                 get_device(dev);
101                 list_del_init(entry);
102                 list_add_tail(entry, &dpm_active);
103                 resume_device(dev);
104                 put_device(dev);
105         }
106 }
107
108
109 /**
110  *      device_pm_power_up - Turn on all devices that need special attention.
111  *
112  *      Power on system devices then devices that required we shut them down
113  *      with interrupts disabled.
114  *      Called with interrupts disabled.
115  */
116
117 void device_power_up(void)
118 {
119         sysdev_resume();
120         dpm_power_up();
121 }
122
123 EXPORT_SYMBOL_GPL(device_power_up);
124
125