Messages in this thread | | | Date | Thu, 27 Jul 2006 02:20:35 +0200 | From | Pavel Machek <> | Subject | Generic battery interface |
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Hi!
(Vojtech and other thinkpad users: look at tp_smapi package; it includes stuff like "do not charge battery unless it is below 90%", which should make your battery last few more years).
(I'll still need to test it on x60, sorry).
Anyway, unlike acpi, tp_smapi uses some reasonably-nice one-value-per-file sysfs interface. I have few objections:
0) it needs to move to /sys/class/battery/tp_smapi or something like that
1) it probably should not include units in the files (hard to parse, and someone may have great idea to choose different units)
2) some optional method for battery applets to avoid polling would be nice (OTOH tp_smapi probably does not support notifications, so it is not its fault)
3) some fields look almost too specialized, but if hardware supports them, I guess we should export them, too...
...but otherwise it looks very good, certainly better than alternatives. Perhaps we should make something like this "generic" battery interface?
Good description is at http://thinkwiki.org/wiki/Tp_smapi#Installation_from_source , and to give you a quick example:
# cat /sys/devices/platform/smapi/BAT0/installed # cat /sys/devices/platform/smapi/BAT0/state # idle/charging/discharging # cat /sys/devices/platform/smapi/BAT0/cycle_count # cat /sys/devices/platform/smapi/BAT0/current_now # instantaneous current # cat /sys/devices/platform/smapi/BAT0/current_avg # last minute average # cat /sys/devices/platform/smapi/BAT0/power_now # instantaneous power # cat /sys/devices/platform/smapi/BAT0/power_avg # last minute average # cat /sys/devices/platform/smapi/BAT0/last_full_capacity # cat /sys/devices/platform/smapi/BAT0/remaining_capacity # cat /sys/devices/platform/smapi/BAT0/design_capacity # cat /sys/devices/platform/smapi/BAT0/voltage # cat /sys/devices/platform/smapi/BAT0/design_voltage # cat /sys/devices/platform/smapi/BAT0/manufacturer # cat /sys/devices/platform/smapi/BAT0/model # cat /sys/devices/platform/smapi/BAT0/barcoding # cat /sys/devices/platform/smapi/BAT0/chemistry # cat /sys/devices/platform/smapi/BAT0/serial # cat /sys/devices/platform/smapi/BAT0/manufacture_date # cat /sys/devices/platform/smapi/BAT0/first_use_date # cat /sys/devices/platform/smapi/ac_connected
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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