Re: bq2415x_charger.c: battery is discharged (fast, 224mA) when it should be charged

Pali Rohár
2015-02-01T10:08:16Z

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Hello,

On Sunday 01 February 2015 10:47:02 Pavel Machek wrote:
> Hi!
>
> I connected N900 with full battery using USB. For some reason,
> charge limit was set to 100mA, battery was "full" and was
> discharging:
>

Make sure you have loaded some usb gadget. Without it battery
charging via dedicated wallcharger (and probably also usb host
charger) does not working. g_nokia should be OK.

Try also compiling kernel with CONFIG_USB_GADGET_VBUS_DRAW=500

Also for charger autodetection you need to have loaded
isp1704_charer.ko module (or compiled into kernel).

And make sure that isp1704_charger is loaded before module
bq2415x_charger (there is some probe defer, no idea if it works
as excepted).

> root@n900:/my/tui/ofone# ./tefone
> Ready.
> Battery 4.017 V 4.039 V 81 % 0 % 0 / 0 / 2056 mAh Full
> -242.224 / 550 / 100 mA
>
> I adjusted the current limit, but got no change, battery is
> still discharging, fast:
>
> root@n900:/my/tui/ofone# echo 500 >
> /sys/class/power_supply/bq24150a-0/current_limit

You can try to write "host" to sysfs entry "mode". Another value
is "dedicated" for wallchargers.

> root@n900:/my/tui/ofone# ./tefone
> Ready.
> Battery 3.994 V 4.034 V 78 % 0 % 0 / 0 / 2056 mAh Full
> -251.506 / 550 / 500 mA Battery 4.0 V 4.037 V 79 % 0 %
> 0 / 0 / 2056 mAh Full -223.125 / 550 / 500 mA Battery
> 4.005 V 4.037 V 79 % 0 % 0 / 0 / 2056 mAh Full -224.91
> / 550 / 500 mA Battery 3.994 V 4.037 V 78 % 0 % 0 / 0 /
> 2056 mAh Full -224.91 / 550 / 500 mA Battery 4.023 V
> 4.037 V 81 % 0 % 0 / 0 / 2056 mAh Full -224.91 / 550 /
> 500 mA Battery 4.011 V 4.037 V 80 % 0 % 0 / 0 / 2056
> mAh Full -224.91 / 550 / 500 mA Battery 3.994 V 4.031 V
> 78 % 0 % 0 / 0 / 2056 mAh Full -256.504 / 550 / 500 mA
> Battery 3.994 V 4.029 V 78 % 0 % 0 / 0 / 2056 mAh Full
> -224.017 / 550 / 500 mA Battery 3.988 V 4.029 V 77 % 0
> % 0 / 0 / 2056 mAh Full -224.731 / 550 / 500 mA Battery
> 4.005 V 4.023 V 79 % 0 % 0 / 0 / 2056 mAh Full -223.66
> / 550 / 500 mA
>
> I'm getting a lot of
>
> [ 208.037719] bq27x00-battery 2-0055: battery is not
> calibrated! ignoring capacity values [ 238.038024]
> bq27x00-battery 2-0055: battery is not calibrated! ignoring
> capacity values
>

Message is print every time when somebody try to read those
properties. I think that printing it only one time should be
enough. Change to WARN_ONCE?

Also design capacity from bq27x00_battery is incorrect (2056) on
all N900 devices. It comes from some EEPROM memory stored in N900
and without HW hacking it is not possible to rewrite.

I would suggest to add support for bq27x00_battery module to do
not report design capacity. Maybe in N900 DT file can be property
which tell driver to ignore it.

> messages, that's why all the 0s in battery information dump.
>
> Any ideas?
>
> Thanks,
> Pavel

--
Pali Rohár
pali.rohar@gmail.com

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