NAME
schsio —
SMSC SCH311x LPC Super I/O
SYNOPSIS
schsio* at isa? port 0x2e flags 0x0000
schsio* at isa? port 0x4e flags 0x0000
schsio* at isa? port 0x162e flags 0x0000
schsio* at isa? port 0x164e flags 0x0000
DESCRIPTION
The schsio driver provides support for the
SMSC SCH3112, SCH3114, and SCH3116 ICs. Among other things, the devices
contain environment sensors, a watchdog timer, and fan control. The
schsio driver supports the environment sensors and
the watchdog timer.
The hardware provides the following sensors:
| Sensor | Units | Typical use |
Internal
diode |
uK | IC internal thermal diode |
Remote diode
1 |
uK | External thermal diode |
Remove diode
2 |
uK | External thermal diode |
FAN1 |
RPM | Fan tachometer |
FAN2 |
RPM | Fan tachometer |
FAN3 |
RPM | Fan tachometer |
+2.5V |
uV | Voltage |
+1.5V
(Vccp) |
uV | Voltage |
+3.3V
(VCC) |
uV | Voltage |
+5V |
uV | Voltage |
+12V |
uV | Voltage |
+3.3V
(VTR) |
uV | Voltage |
+3V
(Vbat) |
uV | Voltage |
schsio provides the standard
watchdog(4) interface and may be used with
watchdogd(8). The watchdog timer may be configured to a value from 1
second to 255 minutes. The watchdog timer has a resolution of 1 second in
the timeout interval 1 to 255 seconds. Outside this interval, the resolution
is 1 minute.
Note that the pin used for signalling the timer expiration is
configurable and may on some boards be intended for other uses than this.
Because of this, the chip may not by default be configured to use the pin
for watchdog operation. To force the schsio device
to use the pin for watchdog operation, the driver may be configured with an
autoconf(9) flags setting of 0x0001.
SEE ALSO
intro(4), isa(4), watchdog(4), sensorsd(8), sysctl(8), watchdogd(8), autoconf(9)
HISTORY
The schsio driver first appeared in
OpenBSD 4.5.
AUTHORS
The schsio driver was written by
Michael Knudsen
<mk@openbsd.org>.