linux/drivers/base/power/runtime.c
Dominik Brodowski 8e9e793d68 [PATCH] pcmcia: merge suspend into device model
Merge the suspend and resume methods for 16-bit PCMCIA cards into the
device model -- for both runtime power management and suspend to ram/disk.

Bugfix in ds.c by Richard Purdie
Signed-Off-By: Richard Purdie <rpurdie@rpsys.net>

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2006-01-06 00:02:03 +01:00

85 lines
1.8 KiB
C

/*
* drivers/base/power/runtime.c - Handling dynamic device power management.
*
* Copyright (c) 2003 Patrick Mochel
* Copyright (c) 2003 Open Source Development Lab
*
*/
#include <linux/device.h>
#include "power.h"
static void runtime_resume(struct device * dev)
{
dev_dbg(dev, "resuming\n");
if (!dev->power.power_state.event)
return;
if (!resume_device(dev))
dev->power.power_state = PMSG_ON;
}
/**
* dpm_runtime_resume - Power one device back on.
* @dev: Device.
*
* Bring one device back to the on state by first powering it
* on, then restoring state. We only operate on devices that aren't
* already on.
* FIXME: We need to handle devices that are in an unknown state.
*/
void dpm_runtime_resume(struct device * dev)
{
down(&dpm_sem);
runtime_resume(dev);
up(&dpm_sem);
}
EXPORT_SYMBOL(dpm_runtime_resume);
/**
* dpm_runtime_suspend - Put one device in low-power state.
* @dev: Device.
* @state: State to enter.
*/
int dpm_runtime_suspend(struct device * dev, pm_message_t state)
{
int error = 0;
down(&dpm_sem);
if (dev->power.power_state.event == state.event)
goto Done;
if (dev->power.power_state.event)
runtime_resume(dev);
if (!(error = suspend_device(dev, state)))
dev->power.power_state = state;
Done:
up(&dpm_sem);
return error;
}
EXPORT_SYMBOL(dpm_runtime_suspend);
#if 0
/**
* dpm_set_power_state - Update power_state field.
* @dev: Device.
* @state: Power state device is in.
*
* This is an update mechanism for drivers to notify the core
* what power state a device is in. Device probing code may not
* always be able to tell, but we need accurate information to
* work reliably.
*/
void dpm_set_power_state(struct device * dev, pm_message_t state)
{
down(&dpm_sem);
dev->power.power_state = state;
up(&dpm_sem);
}
#endif /* 0 */