TCTRL(4) OpenBSD Programmer's Manual (SPARC) TCTRL(4)NAMEtctrl - Tadpole Microcontroller Interface
SYNOPSIS
tctrl0 at obio0
DESCRIPTION
The tctrl driver provides control over many functions on the Tadpole
SPARCbook 3 series laptops, via their TS102 chip.
The microcontroller is used to power the TFT display down when the laptop
lid is closed and when the screen is blanked by the pninek(4) or pnozz(4)
driver. The tctrl is also used to power the laptop off when the
reboot(2) system call is used with the RB_POWERDOWN flag is set.
The PCMCIA part of the controller is managed by the tslot(4) driver.
POWER MANAGEMENT INTERFACE
The tctrl driver provides an interface which simulates the Advanced Power
Management (APM) BIOS functions encountered on some x86 hardware. The
BIOS functions are translated into the appropriate microcontroller
requests. Currently only battery level, AC connection, and charging
status are available from the tctrl device. Suspend/resume and other
power events are not yet supported.
The tctrl driver implements the following ioctl(2) calls. They are
defined in <machine/apmvar.h>.
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
Can not 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.
The battery_life value contains the estimated percentage of
battery life available. 100% indicates a full charge.
The minutes_left value is always -1, as the hardware does not
provide an estimated number of minutes of battery life remaining.
APM_IOC_PRN_CTL
(int) This ioctl(2) controls message output by the tctrl 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.
FILES
/dev/apm APM data device. May only be opened read-only. May be
opened by multiple concurrent users.
/dev/apmctl APM 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 ALSOreboot(2), intro(4), pninek(4), pnozz(4), tslot(4), apm(8), apmd(8)BUGS
Not all power management functions of the microcontroller are supported.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
