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apm(4/macppc) advanced power management device interface
apm(4) Alliance ProMotion video driver

APM(4) Device Drivers Manual (macppc) APM(4)

NAME

apmadvanced power management device interface

SYNOPSIS

apm0 at adb?

DESCRIPTION

The apm driver provides an interface which simulates the Advanced Power Management (APM) BIOS functions. The BIOS functions are translated into the appropriate PowerManager requests. Currently only battery level, AC connection, and charging status is available from the apm device. Suspend/resume and other power events are NOT YET SUPPORTED.
Configuration options:
APMDEBUG
Enable various driver status messages.
DIAGNOSTIC
Enable debugging messages.
DEBUG
Enable other debugging messages.
The apm driver implements the following ioctl(2) calls. They are defined in <machine/apmvar.h>.
 
 
APM_IOC_REJECT
Not implemented. DO NOT USE.
 
 
APM_IOC_STANDBY
NOT YET SUPPORTED on macppc (no parameters) Request “standby” mode.
 
 
APM_IOC_SUSPEND
NOT YET SUPPORTED on macppc (no parameters) Request “suspend” mode.
 
 
APM_IOC_GETPOWER
(struct apm_power_info) Request the current power state. The argument structure is as follows:
struct apm_power_info { 
	u_char battery_state; 
	u_char ac_state; 
	u_char battery_life; 
	u_char spare1; 
	u_int minutes_left; 
	u_int spare2[6]; 
};
    
The following values are defined for battery_state:
 
 
APM_BATT_HIGH
Battery has a high state of charge.
 
 
APM_BATT_LOW
Battery has a low state of charge.
 
 
APM_BATT_CRITICAL
Battery has a critical state of charge.
 
 
APM_BATT_CHARGING
Battery is not high, low, or critical and is currently charging.
 
 
APM_BATT_UNKNOWN
Cannot read the current battery state.
 
 
APM_BATTERY_ABSENT
No battery installed.
The following values are defined for ac_state:
 
 
APM_AC_OFF
External power not detected.
 
 
APM_AC_ON
External power detected.
 
 
APM_AC_BACKUP
Backup power in use.
 
 
APM_AC_UNKNOWN
External power state unknown.
The battery_life value contains the estimated percentage of battery life available. 100% indicates a full charge.
If the battery is charging, i.e. when battery_state is equal to APM_BATT_CHARGING, the battery_life value contains the estimated number of minutes until the battery will be fully charged. Otherwise, the minutes_left value contains the estimated number of minutes of battery life remaining.
 
 
APM_IOC_NEXTEVENT
NOT YET SUPPORTED on macppc (struct apm_event_info) The APM driver stores up to APM_NEVENTS events. This was defined as 16 at the time this documentation was written. If the event list is full when a new event is detected the new event is lost. APM_IOC_NEXTEVENT ioctl returns the next event on the list or EAGAIN if the event list is empty. The format of the returned event is:
struct apm_event_info { 
	u_int type; 
	u_int index; 
	u_int spare[8]; 
};
    
where index is a sequential count of events that can be used to check if any events were lost and type is one of:
 
 
APM_IOC_DEV_CTL
NOT YET SUPPORTED on macppc (struct apm_ctl) Allows an application to directly set the APM operating mode. The argument structure is as follows:
struct apm_ctl { 
	u_int dev; 
	u_int mode; 
};
    
dev indicates the device, typically APM_DEV_ALLDEVS.
mode indicates the desired operating mode. Possible values are
 
 
APM_IOC_PRN_CTL
NOT YET SUPPORTED on macppc (int) This ioctl(2) controls message output by the APM driver when a power change event is detected. The integer parameter is one of:
 
 
APM_PRINT_ON
All power change events result in a message. This is the normal operating mode for the driver.
 
 
APM_PRINT_OFF
Power change event messages are suppressed.
 
 
APM_PRINT_PCT
Power change event messages are suppressed unless the estimated battery life percentage changes.
However, in no case will power status messages be displayed until the battery life goes below the percentage in the sysctl(8) state variable machdep.apmwarn. Setting machdep.apmwarn to zero disables all warnings regardless of the APM_IOC_PRN_CTL setting.
NOT YET SUPPORTED on macppc: As noted above, the operation of the APM driver can be modified using the machdep.apmwarn sysctl(8) variable. Another driver modifier is the machdep.apmhalt variable. When machdep.apmhalt is set to 1 the APM power down code is modified in a way necessary for correct operation on some systems, mainly IBM laptops. If your system does not power down when given the command halt -p try setting machdep.apmhalt to 1 using sysctl(8). The variable can be set at boot time in sysctl.conf(5).

FILES

 
 
/dev/apm
Power management data device. May only be opened read-only. May be opened by multiple concurrent users.
 
 
/dev/apmctl
Power management control device. May be opened read-write or write-only. May only be opened by one user at a time. An attempt to open the file when in use will fail, returning EBUSY.

SEE ALSO

adb(4), intro(4), sysctl.conf(5), apm(8), apmd(8), halt(8), sysctl(8)

HISTORY

The apm driver source code contains these copyrights:
...and has been hacked on by many others since.

BUGS

Sleep modes and power events are not supported.
February 27, 2016 OpenBSD-current