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SYSMON_PSWITCH(9) Kernel Developer's Manual SYSMON_PSWITCH(9)

sysmon_pswitch — framework for power switches

#include <dev/sysmon/sysmonvar.h>

int
sysmon_pswitch_register(struct sysmon_pswitch *smpsw);

void
sysmon_pswitch_unregister(struct sysmon_pswitch *smpsw);

void
sysmon_pswitch_event(struct sysmon_pswitch *smpsw, int event);

The machine-independent sysmon_pswitch provides a framework for power management. The interface has been largely superseded by the pmf(9) framework, but sysmon_pswitch is still used to manage power switches as well as related mechanical adapters and buttons. These are encapsulated in the following structure: 
struct sysmon_pswitch {
	const char *smpsw_name;		/* power switch name */
	int smpsw_type;			/* power switch type */

	LIST_ENTRY(sysmon_pswitch) smpsw_list;
};

Unsurprisingly, smpsw_name specifies the name of the power switch and smpsw_type defines the type of it. The following types are defined:

PSWITCH_TYPE_POWER
 
PSWITCH_TYPE_SLEEP
 
PSWITCH_TYPE_LID
 
PSWITCH_TYPE_RESET
 
PSWITCH_TYPE_ACADAPTER
 
PSWITCH_TYPE_HOTKEY
 
PSWITCH_TYPE_RADIO
 

If the type is PSWITCH_TYPE_HOTKEY, there are few predefined names that can be used for smpsw_name:

PSWITCH_HK_DISPLAY_CYCLE
PSWITCH_HK_LOCK_SCREEN
PSWITCH_HK_BATTERY_INFO
PSWITCH_HK_EJECT_BUTTON
PSWITCH_HK_ZOOM_BUTTON
PSWITCH_HK_VENDOR_BUTTON

Once a power switch event has been proceeded, sysmon_pswitch will inform the user space powerd(8), which will possibly execute a script matching the type of the power switch.

After the structure has been initialized, a new power switch device can be registered by using (). The device can be detached from the framework by ().

The () is used to signal a new power switch event. There are two possibilities for the value of event:

PSWITCH_EVENT_PRESSED
A button has been pressed, the lid has been closed, the AC adapter is off, etc.
PSWITCH_EVENT_RELEASED
A button has been released, the lid is open, the AC adapter is on, etc.

The corresponding events in powerd(8) are and .

powerd(8), pmf(9), sysmon_envsys(9), sysmon_taskq(9)

Jason R. Thorpe <thorpej@NetBSD.org>

January 6, 2015 NetBSD-9.2