Make changes on source file instead of file in destination location (/etc/rc.d/linux). Use sysctl-variable for all occurences of hardcoded path of /compat/linux.

I do not have a commit bit, so please go ahead and commit it :)

I've tried the patch on a recent current and added some printf-debug. The output of rdmsr_safe(MSR_IA32_HWP_REQUEST, &requested); changes after the suspend:
before zzz :
Read: 0x0000000033001701

Needed to add dma-device to kernel config, otherwise dsp device was not probed.

Update according to comments.

Remove deprecated compatible entry

Move codec_stop call to a different place.

Changed "end"-parameter for resource allocation.

Move H3/H5 specific setup into its mixer_init function.

My intention was to simplify the querying of current rate mainly for scripts and userland programs. Using acpiconf -i <x> in a script occured a bit cumbersome to me because for more than one battery, one has to iterate over the result of hw.acpi.battery.units and parse the acpiconf's output to get the actual rate.
Also, the most (hm, i think actually all) FreeBSD compatible monitors which sources i've seen were using the sysctls interface and not the ACPIIO_BATT_* ioctls, so there would be a lower threshold to add the information about current rate.

Updated diff according to Ians remarks.

fix types of private data.

Add header file to patch again.

Fix re-enabling interrupts