[ltp] Help needed: battery date encoding for tp_smapi

[Shem Multinymous]

Hi,

The ThinkPad batterry (on recent models, at least) reports the
manufature date and the first use date. This is visible in Battery
Maximizer under Windows, and I'm trying to add support for this to the
tp_smapi driver (http://thinkwiki.org/wiki/tp_smapi).

The information is included in the raw data presented by tp_smapi in
/sys/devices/platform/smapi/BAT0/dump, and I believe I identified the
fields, but I can't figure out their exact meaning.

I need help from people who can check those dates in Windows, and then
tell me what the corresponding raw data is by running the following
command in Linux:

perl -ne '@a=3Dsplit; printf("Manufacture: %d\n",
hex($a[8])+hex($a[9])*256) if ++$i=3D=3D3;
printf("First use:   %d\n", hex($a[2])+hex($a[3])*256) if $i=3D=3D8' <
/sys/devices/platform/smapi/BAT0/dump

(All on one line. Load the tp_smapi driver first.)

Here's the data I have so far.

Battery 1:
Manufacture: 13052   (Battery Maximizer says 2005-7-28)
First use:   13103   (Battery Maximizer says 2005-09)

Battery 2:
Manufacture: 13072   (Battery Maximizer says 2005-8-16)
First use:   13103   (Battery Maximizer says 2005-09)

It looks like the raw data is almost, but not quite, the number of
days since 1 Jan 1970. Looking at the manufacture dates, in the first
battery it's off by +61 days, and in the second it's off by +62 days.
Any idea what encoding they could be using?

  Shem