Power

---

The Power API provides functions to control the power service.

Required Header

#include <device/power.h>

Overview

The Power API provides the way to control the power service. It can be made to hold the specific state to avoid changing display and CPU state internally.

Functions
int	device_power_request_lock (power_lock_e type, int timeout_ms)
	Locks the given lock state for a specified time.
int	device_power_release_lock (power_lock_e type)
	Releases the given lock state which was locked before.
int	device_power_wakeup (bool dim) TIZEN_DEPRECATED_API
	Changes the current power state to the normal/dim state.
int	device_power_reboot (const char *reason)
	Reboots the device.

---

Enumeration Type Documentation

enum power_lock_e

Enumeration for lock type.

Each enum ensures that the suitable device is on until all the lock requests have been released or after a timeout.

Enum Type	CPU	Brightness(Display)
POWER_LOCK_CPU	ON	OFF
POWER_LOCK_DISPLAY	ON	ON(Normal)
POWER_LOCK_DISPLAY_DIM	ON	ON(Dim)

The POWER_LOCK_DISPLAY and POWER_LOCK_DISPLAY_DIM types were deprecated in Tizen 2.4.
Please use below api set instead of these types.
int efl_util_set_window_screen_mode(Evas_Object *window, efl_util_screen_mode_e mode);
int efl_util_get_window_screen_mode(Evas_Object *window, efl_util_screen_mode_e *mode);

Since :

2.3

Remarks:

An application can lock the specific type.

These enums are mutually exclusive.

You cannot combine with an enum below.

Enumerator:

POWER_LOCK_CPU	CPU lock
POWER_LOCK_DISPLAY	Display normal lock (Deprecated since 2.4. Use efl_util_set_window_screen_mode() instead)
POWER_LOCK_DISPLAY_DIM	Display dim lock (Deprecated since 2.4. Use efl_util_set_window_screen_mode() instead)

---

Function Documentation

int device_power_reboot

(

const char *

reason

)

Reboots the device.

Warning:

This is not for use by third-party applications.

Will not return if the reboot is successful.
It operates asynchronously.

Since :

2.3.1

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/reboot

Parameters:

[in]

reason

Pass to the platform and kernel to request special reboot reason, or null

Returns:

0 on success, otherwise a negative error value

Return values:

DEVICE_ERROR_NONE	Successful
DEVICE_ERROR_INVALID_PARAMETER	Invalid parameter
DEVICE_ERROR_PERMISSION_DENIED	Permission denied
DEVICE_ERROR_OPERATION_FAILED	Operation failed

int device_power_release_lock

(

power_lock_e

type

)

Releases the given lock state which was locked before.

Since :

2.3

Privilege Level:

public

Privilege:

http://tizen.org/privilege/display

Parameters:

[in]

type

The power type to release lock

Returns:

0 on success, otherwise a negative error value

Return values:

DEVICE_ERROR_NONE	Successful
DEVICE_ERROR_INVALID_PARAMETER	Invalid parameter
DEVICE_ERROR_PERMISSION_DENIED	Permission denied
DEVICE_ERROR_OPERATION_FAILED	Operation failed

See also:

device_power_request_lock()

int device_power_request_lock	(	power_lock_e	type,
		int	timeout_ms
	)

Locks the given lock state for a specified time.

After the given timeout_ms (in milliseconds), unlock the given lock state automatically.

Since :

2.3

Privilege Level:

public

Privilege:

http://tizen.org/privilege/display

Remarks:

If the process dies, then every lock will be removed.

Parameters:

[in]	type	The power type to request lock
[in]	timeout_ms	The positive number in milliseconds or 0 for permanent lock So you must release the permanent lock of power state with device_power_release_lock() if timeout_ms is zero

Returns:

0 on success, otherwise a negative error value

Return values:

DEVICE_ERROR_NONE	Successful
DEVICE_ERROR_INVALID_PARAMETER	Invalid parameter
DEVICE_ERROR_PERMISSION_DENIED	Permission denied
DEVICE_ERROR_OPERATION_FAILED	Operation failed

See also:

device_power_release_lock()

int device_power_wakeup

(

bool

dim

)

Changes the current power state to the normal/dim state.

Deprecated:

Deprecated Since 2.4

Since :

2.3

Privilege Level:

public

Privilege:

http://tizen.org/privilege/display

Remarks:

This API triggers turn on process and then updates the status when it completes. While the operation is on-going, the device_display_get_state() function returns previous display state.

Parameters:

[in]

dim

Set true to set the dim state, otherwise set false to not set the dim state

Returns:

0 on success, otherwise a negative error value

Return values:

DEVICE_ERROR_NONE	Successful
DEVICE_ERROR_INVALID_PARAMETER	Invalid parameter
DEVICE_ERROR_PERMISSION_DENIED	Permission denied
DEVICE_ERROR_OPERATION_FAILED	Operation failed

Postcondition:

The device will be in DISPLAY_STATE_NORMAL state.