/**
* acpi_dev_suspend_late - Put device into a low-power state using ACPI.
* @dev: Device to put into a low-power state.
*
* Put the given device into a low-power state during system transition to a
* sleep state using the standard ACPI mechanism. Set up system wakeup if
* desired, choose the state to put the device into (this checks if system
* wakeup is expected to work too), and set the power state of the device.
*/
int acpi_dev_suspend_late(struct device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
u32 target_state;
bool wakeup;
bool can_wakeup;
int error;
if (!adev)
return 0;
target_state = acpi_target_system_state();
wakeup = device_may_wakeup(dev);
can_wakeup = acpi_device_can_wakeup(adev);
if (can_wakeup) {
error = __acpi_device_sleep_wake(adev, target_state, wakeup);
if (wakeup && error)
return error;
} else if (wakeup) {
dev_warn(dev,
"device is not wakeup-capable, not enabling wakeup\n");
}
error = acpi_dev_pm_low_power(dev, adev, target_state);
if (error && can_wakeup)
__acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);
return error;
}
/**
* acpi_dev_suspend_late - Put device into a low-power state using ACPI.
* @dev: Device to put into a low-power state.
*
* Put the given device into a low-power state during system transition to a
* sleep state using the standard ACPI mechanism. Set up system wakeup if
* desired, choose the state to put the device into (this checks if system
* wakeup is expected to work too), and set the power state of the device.
*/
int acpi_dev_suspend_late(struct device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
u32 target_state;
bool wakeup;
int error;
if (!adev)
return 0;
target_state = acpi_target_system_state();
wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev);
error = acpi_device_wakeup(adev, target_state, wakeup);
if (wakeup && error)
return error;
error = acpi_dev_pm_low_power(dev, adev, target_state);
if (error)
acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false);
return error;
}