| NHPOW(4) | Kernel Interfaces Manual (Sandpoint) | NHPOW(4) |
nhpow also detects a soft power-off condition, which is triggered by holding the front panel power button pressed for several seconds. This driver can optionally invoke powerd(8) to get a finer control over the system shutdown procedure. It is capable of reporting a power-button-pressed event. Refer to the powerd(8) manual section for more details.
The nhpow driver provides access to its 8 bidirectional GPIO pins through the gpio(4) controller interface. The pins have the following meaning when being written:
| Pin | Active level | Function |
0 |
high | System power off |
1 |
high | Assert system reset to all devices |
2 |
low | Status LED |
3 |
high | High speed fan |
4 |
low | Debug LED 1 |
5 |
low | Debug LED 2 |
6 |
low | USB port 1 LED |
7 |
low | USB port 2 LED |
When reading, the pins have the following meaning:
| Pin | Active level | Function |
0 |
low | Power button pressed |
1 |
low | Reset/install button pressed |
4 |
high | H/W version bit 0 |
5 |
high | H/W version bit 1 |
6 |
high | H/W version bit 2 |
7 |
high | H/W version bit 3 |
nhpow attaches automatically for all NH-230/231 compatible products:
| January 15, 2012 | NetBSD 6.1 |