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This change adds a common part of smart battery driver. Following
features are not implemented, or in chip specific driver:
Battery access control, authentication, factory mode
Manufacturer access/data commands
Block read/write, device name, flash data
Chip specific features, per cell info/temp/capacity
Signed-off-by: Rong Chang <rongchang@google.com>
BUG=chrome-os-partner:7856
TEST=console command check battery staus
[unplug power]
> battery
[check voltage,current,capacity,time to empty]
[plug power]
> charger voltage 8400
> charger current 4250
> battery
[check current,time to full]
> charger input 4032
> battery
[check current,time to full]
[wait 130 seconds, charger watch dog timeout]
> battery
[check current]
Change-Id: Ifac17a0892f52e8f37eebc14b00e71f18360776c
Signed-off-by: Rong Chang <rongchang@chromium.org>
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