linux-kernel - Re: [PATCH 00/14] POWER: BQ27x00: New Properties, fixes, bq27000 support

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Date:	Mon, 07 Feb 2011 01:12:25 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Felipe Contreras <felipe.contreras@...il.com>
CC:	Anton Vorontsov <cbouatmailru@...il.com>,
	Rodolfo Giometti <giometti@...ux.it>,
	Grazvydas Ignotas <notasas@...il.com>,
	linux-kernel@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: Re: [PATCH 00/14] POWER: BQ27x00: New Properties, fixes, bq27000
 support

On 02/07/2011 01:00 AM, Felipe Contreras wrote:
> On Mon, Feb 7, 2011 at 1:09 AM, Lars-Peter Clausen <lars@...afoo.de> wrote:
>> On 02/06/2011 11:47 PM, Felipe Contreras wrote:
>>> Hi,
>>>
>>> On Sun, Feb 6, 2011 at 2:47 AM, Lars-Peter Clausen <lars@...afoo.de> wrote:
>>>> This patch series contains a few updates for the bq27x00 driver:
>>>> * Support for additional power supply properties
>>>> * Support for the bq27000 battery which is identical to the bq27200 but is
>>>>  connected through the HDQ bus.
>>>> * Adds a register cache to the driver and introduces polling the batteries state
>>>> * Minor improvements and cleanups
>>>>
>>>> The last patch in this series is not specific to the bq27x00 driver but is
>>>> required for uevents to be generated properly for this driver.
>>>> The patch makes properties which return -ENODATA to be ignored when generating
>>>> uevents. Previously in such a case uevent generation would have been aborted
>>>> with an error. But since the bq27x00 return -ENODATA for the TIME_TO_FULL
>>>> property when the battery is not charging and for the TIME_TO_EMPTY property
>>>> when the battery is not discharging and at least one of them is always true
>>>> uevent generation would always fail.
>>>>
>>>> This series has so far been tested with the bq27000 and the bq27200 battery, but
>>>> not with the bq27500 battery, so it would be nice if somebody with a board
>>>> containing such a battery could test the patches to make sure that there are no
>>>> regressions.
>>>
>>> This might be a bit off-topic, but I have tried to get the battery on
>>> the Nokia N900 working, and so far I'm only able to query the
>>> remaining capacity, but not really to enabling charging. This is very
>>> annoying, as I can only hack a certain amount of time, and then I have
>>> to reflash, reboot, and wait for the batter to charge with the
>>> official system (if there's enough power to flash).
>>>
>>> Do you have any hints how to do that?
>>
>> Sorry, I've never worked with the N900, so I have no idea. But Pali has tested this
>> patch series on his N900, so he might have an idea.
> 
> Well, it has a bq27200 AFAIK.
> 

It has, but that doesn't tell you anything about the charging circuit.

- Lars
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