car charger

[Michael Shiloh]

Oye.

Moving this thread to the kernel list. This seems very wrong to me.


Michael


Joel Newkirk wrote:
> On Sat, 11 Oct 2008 16:38:20 -0700, Michael Shiloh <michael at openmoko.org>
> wrote:
>> Joel Newkirk wrote:
>>> On Fri, 10 Oct 2008 09:05:09 -0700, Michael Shiloh
>> <michael at openmoko.org>
>>> 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 
>> 500mA.
>> 4. Display (and report) chgmode.
>>
>> Thanks,
>> Michael
> 
> OK, here's the final results.  I've flashed the kernel since my previous
> post in this thread, currently uname -a shows "Linux iota.newkirk.us 2.6.24
> #1 PREEMPT Fri Sep 26 14:13:25 EST 2008 armv4tl unknown".  After shutting
> down and restarting:
> 
> with nothing connected, I get:
> chgmode: play-only
> charger_type: charger 1A mode 1A
> 
> Connected to PC:
> chgmode: fast
> charger_type: charger 1A mode 500mA
> 
> Connected to included wall charger:
> chgmode: fast
> charger_type: charger 1A mode 1A
> 
> Connected to cheapo car lighter-to-USB adapter:
> chgmode: fast
> charger_type: charger 1A mode 1A
> 
> (of course since the car charger provides 1000mA this is what I want it to
> do, but I realize it shouldn't be doing it without intervention)
> 
> 
> j
> 
> 
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