ca078bae81
This adds type-checking to pm_message_t, so that people can't confuse it with int or u32. It also allows us to fix "disk yoyo" during suspend (disk spinning down/up/down). [We've tried that before; since that cpufreq problems were fixed and I've tried make allyes config and fixed resulting damage.] Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
126 lines
2.4 KiB
C
126 lines
2.4 KiB
C
/*
|
|
* resume.c - Functions for waking devices up.
|
|
*
|
|
* Copyright (c) 2003 Patrick Mochel
|
|
* Copyright (c) 2003 Open Source Development Labs
|
|
*
|
|
* This file is released under the GPLv2
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include "power.h"
|
|
|
|
extern int sysdev_resume(void);
|
|
|
|
|
|
/**
|
|
* resume_device - Restore state for one device.
|
|
* @dev: Device.
|
|
*
|
|
*/
|
|
|
|
int resume_device(struct device * dev)
|
|
{
|
|
int error = 0;
|
|
|
|
down(&dev->sem);
|
|
if (dev->power.pm_parent
|
|
&& dev->power.pm_parent->power.power_state.event) {
|
|
dev_err(dev, "PM: resume from %d, parent %s still %d\n",
|
|
dev->power.power_state.event,
|
|
dev->power.pm_parent->bus_id,
|
|
dev->power.pm_parent->power.power_state.event);
|
|
}
|
|
if (dev->bus && dev->bus->resume) {
|
|
dev_dbg(dev,"resuming\n");
|
|
error = dev->bus->resume(dev);
|
|
}
|
|
up(&dev->sem);
|
|
return error;
|
|
}
|
|
|
|
|
|
|
|
void dpm_resume(void)
|
|
{
|
|
down(&dpm_list_sem);
|
|
while(!list_empty(&dpm_off)) {
|
|
struct list_head * entry = dpm_off.next;
|
|
struct device * dev = to_device(entry);
|
|
|
|
get_device(dev);
|
|
list_del_init(entry);
|
|
list_add_tail(entry, &dpm_active);
|
|
|
|
up(&dpm_list_sem);
|
|
if (!dev->power.prev_state.event)
|
|
resume_device(dev);
|
|
down(&dpm_list_sem);
|
|
put_device(dev);
|
|
}
|
|
up(&dpm_list_sem);
|
|
}
|
|
|
|
|
|
/**
|
|
* device_resume - Restore state of each device in system.
|
|
*
|
|
* Walk the dpm_off list, remove each entry, resume the device,
|
|
* then add it to the dpm_active list.
|
|
*/
|
|
|
|
void device_resume(void)
|
|
{
|
|
down(&dpm_sem);
|
|
dpm_resume();
|
|
up(&dpm_sem);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(device_resume);
|
|
|
|
|
|
/**
|
|
* device_power_up_irq - Power on some devices.
|
|
*
|
|
* Walk the dpm_off_irq list and power each device up. This
|
|
* is used for devices that required they be powered down with
|
|
* interrupts disabled. As devices are powered on, they are moved to
|
|
* the dpm_suspended list.
|
|
*
|
|
* Interrupts must be disabled when calling this.
|
|
*/
|
|
|
|
void dpm_power_up(void)
|
|
{
|
|
while(!list_empty(&dpm_off_irq)) {
|
|
struct list_head * entry = dpm_off_irq.next;
|
|
struct device * dev = to_device(entry);
|
|
|
|
get_device(dev);
|
|
list_del_init(entry);
|
|
list_add_tail(entry, &dpm_active);
|
|
resume_device(dev);
|
|
put_device(dev);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* device_pm_power_up - Turn on all devices that need special attention.
|
|
*
|
|
* Power on system devices then devices that required we shut them down
|
|
* with interrupts disabled.
|
|
* Called with interrupts disabled.
|
|
*/
|
|
|
|
void device_power_up(void)
|
|
{
|
|
sysdev_resume();
|
|
dpm_power_up();
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(device_power_up);
|
|
|
|
|