2 * resume.c - Functions for waking devices up.
4 * Copyright (c) 2003 Patrick Mochel
5 * Copyright (c) 2003 Open Source Development Labs
7 * This file is released under the GPLv2
11 #include <linux/device.h>
14 extern int sysdev_resume(void);
18 * resume_device - Restore state for one device.
23 int resume_device(struct device * dev)
25 if (dev->power.pm_parent
26 && dev->power.pm_parent->power.power_state) {
27 dev_err(dev, "PM: resume from %d, parent %s still %d\n",
28 dev->power.power_state,
29 dev->power.pm_parent->bus_id,
30 dev->power.pm_parent->power.power_state);
32 if (dev->bus && dev->bus->resume) {
33 dev_dbg(dev,"resuming\n");
34 return dev->bus->resume(dev);
44 while(!list_empty(&dpm_off)) {
45 struct list_head * entry = dpm_off.next;
46 struct device * dev = to_device(entry);
50 list_add_tail(entry, &dpm_active);
53 if (!dev->power.prev_state)
63 * device_resume - Restore state of each device in system.
65 * Walk the dpm_off list, remove each entry, resume the device,
66 * then add it to the dpm_active list.
69 void device_resume(void)
76 EXPORT_SYMBOL_GPL(device_resume);
80 * device_power_up_irq - Power on some devices.
82 * Walk the dpm_off_irq list and power each device up. This
83 * is used for devices that required they be powered down with
84 * interrupts disabled. As devices are powered on, they are moved to
85 * the dpm_suspended list.
87 * Interrupts must be disabled when calling this.
90 void dpm_power_up(void)
92 while(!list_empty(&dpm_off_irq)) {
93 struct list_head * entry = dpm_off_irq.next;
94 struct device * dev = to_device(entry);
98 list_add_tail(entry, &dpm_active);
106 * device_pm_power_up - Turn on all devices that need special attention.
108 * Power on system devices then devices that required we shut them down
109 * with interrupts disabled.
110 * Called with interrupts disabled.
113 void device_power_up(void)
119 EXPORT_SYMBOL_GPL(device_power_up);