Support for PMU based PowerMacs and PowerBooks

modulename: via-pmu.ko
configname: CONFIG_ADB_PMU

Linux Kernel Configuration
└─> Device Drivers
└─> Macintosh device drivers
└─> Support for PMU based PowerMacs and PowerBooks

On PowerBooks, iBooks, and recent iMacs and Power Macintoshes, the
PMU is an embedded microprocessor whose primary function is to
control system power, and battery charging on the portable models.
The PMU also controls the ADB (Apple Desktop Bus) which connects to
the keyboard and mouse on some machines, as well as the non-volatile
RAM and the RTC (real time clock) chip. Say Y to enable support for
this device; you should do so if your machine is one of those
mentioned above.

source code: