mac-mini power button

[pix <pi...@te...>]

hi,

i was trying to get pbbuttons to detect the mac-mini power button. by
running: 

od -t x1 -w1 /dev/pmu

i could see that on pressing the power button, the bytes [0x40 0x0c] are
generated. when you release the button, [0x40 0x04] is generated.

i tried adding this to the module_pmac.c file, but then i noticed a
bigger problem. it appears that when running on the mac mini, pbbuttonsd
doesn't even listen to /dev/pmu. to check, i turned on PMUINTR in
debug.h and compiled with -DDEBUG. i get a lot more debug info, but i
don't get the expected line printing out the bytes that i know are being
generated at /dev/pmu... so i assume somewhere during startup, pbbutons
makes some decision not to monitor /dev/pmu.. possibly because it
doesn't support many laptop-like functions, such as sleeping (this is
also why pmud doesn't want to start on the mac-mini).

anyhow, i have resorted to writing a small program which does nothing
but monitor /dev/pmu, and hand off any read bytes to a script, which
then halts the machine is the power button is pressed.

it is available here... http://f0.am/darcs/lyta/system/pmumon/ the
install rule is very debian-centric, sorry. also, the rcd script
included sets server_mode in /proc/pmu/options, which is something very
peculiar to our setup here, and possibly isn't what you want.

it would probably be better for this *cough* feature to be incorporated
into pbbuttonsd, but it seems a few people are trying to get their
mac-mini power buttons to work like this, so i've made this available.

i hope this is useful for the developers, unless there is some policy
about not supporting desktop machines...

pix.