tree 48fcc8f78e6df67130e8c70b160fea42aeff79ca
parent a024291b367f98188f4da4a66a9f2f40a2163efb
author Michael Albaugh <michael.albaugh@qlogic.com> 1179355509 -0700
committer Roland Dreier <rolandd@cisco.com> 1184037145 -0700

IB/ipath: Support blinking LEDs with an led_override file

When we want to find an InfiniPath HCA in a rack of nodes, it is often
expeditious to blink the status LEDs via a userspace /sys file.

A write-only led_override "file" is published per device. Writes to
this file are interpreted as (string form) numbers, and the resulting
value sent to ipath_set_led_override(). The upper eight bits are
interpretted as a 4.4 fixed-point "frequency in Hertz", and the bottom
two 4-bit values are alternately (D0..3, then D4..7) used by the
board-specific LED-setting function to override the normal state.

Signed-off-by: Michael Albaugh <michael.albaugh@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>