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>
12 #include <linux/resume-trace.h>
18 * resume_device - Restore state for one device.
23 int resume_device(struct device * dev)
30 if (dev->power.pm_parent
31 && dev->power.pm_parent->power.power_state.event) {
32 dev_err(dev, "PM: resume from %d, parent %s still %d\n",
33 dev->power.power_state.event,
34 dev->power.pm_parent->bus_id,
35 dev->power.pm_parent->power.power_state.event);
37 if (dev->bus && dev->bus->resume) {
38 dev_dbg(dev,"resuming\n");
39 error = dev->bus->resume(dev);
51 while(!list_empty(&dpm_off)) {
52 struct list_head * entry = dpm_off.next;
53 struct device * dev = to_device(entry);
57 list_add_tail(entry, &dpm_active);
60 if (!dev->power.prev_state.event)
70 * device_resume - Restore state of each device in system.
72 * Walk the dpm_off list, remove each entry, resume the device,
73 * then add it to the dpm_active list.
76 void device_resume(void)
83 EXPORT_SYMBOL_GPL(device_resume);
87 * device_power_up_irq - Power on some devices.
89 * Walk the dpm_off_irq list and power each device up. This
90 * is used for devices that required they be powered down with
91 * interrupts disabled. As devices are powered on, they are moved to
92 * the dpm_suspended list.
94 * Interrupts must be disabled when calling this.
97 void dpm_power_up(void)
99 while(!list_empty(&dpm_off_irq)) {
100 struct list_head * entry = dpm_off_irq.next;
101 struct device * dev = to_device(entry);
104 list_del_init(entry);
105 list_add_tail(entry, &dpm_active);
113 * device_pm_power_up - Turn on all devices that need special attention.
115 * Power on system devices then devices that required we shut them down
116 * with interrupts disabled.
117 * Called with interrupts disabled.
120 void device_power_up(void)
126 EXPORT_SYMBOL_GPL(device_power_up);