car charger

Michael Shiloh michael at
Sun Oct 12 01:38:20 CEST 2008

Joel Newkirk wrote:
> On Fri, 10 Oct 2008 09:05:09 -0700, Michael Shiloh <michael at>
> wrote:
>> David Garabana Barro wrote:
>>> On Friday 10 October 2008 12:50:57 Cédric Berger wrote:
>>>> Ok, thanks...
>>>> Would be interesting if by chance you could check between the ID pin
>>>> and ground if you have a resistance close to 4.7Kohm ...?
>>> I will look at it, and post the results.
>> Anxiously awaiting your measurements.
>> If there is no 4.7K resistor, I'd move this discussion to the kernel 
>> list. We should not be charging at 1A if we do not see this resistor.
> The cig lighter adapter I got is just a USB port, (the ID pin doesn't exist
> there) just jack in the USB<->MiniUSB cable.  I get the same readings below
> on AC, on PC, and on DC.  If I force charging to 500mA or 100mA then they
> reflect that.
> root at iota:~# cat
> /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/chgmode
> fast
> root at iota:~# cat
> /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/charger_type
> charger 1A mode 1A

If I understand you correctly, this sounds like a bug.

Let me confirm:

1. Disconnect your FreeRunner from any power source.
2. Power cycle (to clear any previous state).
3. Connect the FreeRunner to a PC USB port. We know these source at most 
4. Display (and report) chgmode.


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