[Bug 260214] acpi_battery: Should provide current/max battery charge in Wh (wine expects them)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260214

--- Comment #2 from Damjan Jovanovic <damjan.jov@gmail.com> ---
(In reply to Kubilay Kocak from comment #1)

There's only 6 sysctls in hw.acpi.battery, and they're useful to compare
between a working battery on a new laptop, and a broken battery on an old
laptop, while charging and discharging, so I'll post them inline:

                           Broken      Working       Working
                           battery     battery       battery
                           AC power    discharging   AC power
hw.acpi.battery.info_expire   5           5            5
hw.acpi.battery.units         1           1            1
hw.acpi.battery.state         0           1            2
hw.acpi.battery.rate          0       11959            0
hw.acpi.battery.time         -1          97           -1
hw.acpi.battery.life          0          72           44

time == -1 and rate == 0 can't be used to calculate battery capacity Wh while
charging (not that they're particularly accurate even when discharging; the
life% especially lacks sufficient granularity).

Yes, the ioctl is better, but /dev/acpi is owned by root:operator, and even
though it's
crw-rw-r--
when I successfully open it as non-root user with O_RDONLY, the ioctl() gets:
ioctl: Operation not permitted

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