2 * drivers/base/power/runtime.c - Handling dynamic device power management.
4 * Copyright (c) 2003 Patrick Mochel
5 * Copyright (c) 2003 Open Source Development Lab
9 #include <linux/device.h>
13 static void runtime_resume(struct device * dev)
15 if (!dev->power.power_state)
22 * dpm_runtime_resume - Power one device back on.
25 * Bring one device back to the on state by first powering it
26 * on, then restoring state. We only operate on devices that aren't
28 * FIXME: We need to handle devices that are in an unknown state.
31 void dpm_runtime_resume(struct device * dev)
40 * dpm_runtime_suspend - Put one device in low-power state.
42 * @state: State to enter.
45 int dpm_runtime_suspend(struct device * dev, u32 state)
50 if (dev->power.power_state == state)
53 if (dev->power.power_state)
56 if (!(error = suspend_device(dev,state)))
57 dev->power.power_state = state;
65 * dpm_set_power_state - Update power_state field.
67 * @state: Power state device is in.
69 * This is an update mechanism for drivers to notify the core
70 * what power state a device is in. Device probing code may not
71 * always be able to tell, but we need accurate information to
74 void dpm_set_power_state(struct device * dev, u32 state)
77 dev->power.power_state = state;