From: Bill Gatliff <bgat@billgatliff.com>
To: Aras Vaichas <arasv@magellan-technology.com>
Cc: Pavel Machek <pavel@ucw.cz>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Linus Walleij <linus.walleij@stericsson.com>,
cbou@mail.ru, dwmw2@infradead.org,
LKML <linux-kernel@vger.kernel.org>,
linux-embedded@vger.kernel.org,
Brian Swetland <swetland@google.com>,
rpurdie@rpsys.net, lenz@cs.wisc.edu, Dirk@opfer-online.de,
arminlitzel@web.de, Cyril Hrubis <metan@ucw.cz>,
thommycheck@gmail.com,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
dbaryshkov@gmail.com, omegamoon@gmail.com, eric.y.miao@gmail.com,
utx@penguin.cz, zaurus-devel@lists.linuxtogo.org
Subject: Re: [POWER] battery calibration parameters from sysfs
Date: Mon, 14 Dec 2009 21:02:42 -0600 [thread overview]
Message-ID: <4B26FC52.6060307@billgatliff.com> (raw)
In-Reply-To: <ed62800912141543v2ab7ef63v4b6b2c33018b3296@mail.gmail.com>
Aras Vaichas wrote:
> Unfortunately the simple coulomb counting chips have the disadvantage
> that the CPU has to be running to accumulate the pulses. Of course,
> the pulses could wake the CPU from a suspend mode, but I'd rather not
> do that just to add "one" to a counter ...
>
Could you have the coulomb-counting chip connected to a tiny
microcontroller, or even a dedicated hardware counter? Then the main
CPU wouldn't need to wake as often, it could just ask the
microcontroller over I2C, or read/reset the hardware counter.
b.g.
--
Bill Gatliff
bgat@billgatliff.com
WARNING: multiple messages have this Message-ID (diff)
From: bgat@billgatliff.com (Bill Gatliff)
To: linux-arm-kernel@lists.infradead.org
Subject: [POWER] battery calibration parameters from sysfs
Date: Mon, 14 Dec 2009 21:02:42 -0600 [thread overview]
Message-ID: <4B26FC52.6060307@billgatliff.com> (raw)
In-Reply-To: <ed62800912141543v2ab7ef63v4b6b2c33018b3296@mail.gmail.com>
Aras Vaichas wrote:
> Unfortunately the simple coulomb counting chips have the disadvantage
> that the CPU has to be running to accumulate the pulses. Of course,
> the pulses could wake the CPU from a suspend mode, but I'd rather not
> do that just to add "one" to a counter ...
>
Could you have the coulomb-counting chip connected to a tiny
microcontroller, or even a dedicated hardware counter? Then the main
CPU wouldn't need to wake as often, it could just ask the
microcontroller over I2C, or read/reset the hardware counter.
b.g.
--
Bill Gatliff
bgat at billgatliff.com
WARNING: multiple messages have this Message-ID (diff)
From: Bill Gatliff <bgat@billgatliff.com>
To: Aras Vaichas <arasv@magellan-technology.com>
Cc: Pavel Machek <pavel@ucw.cz>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Linus Walleij <linus.walleij@stericsson.com>,
cbou@mail.ru, dwmw2@infradead.org,
LKML <linux-kernel@vger.kernel.org>,
linux-embedded@vger.kernel.org,
Brian Swetland <swetland@google.com>,
rpurdie@rpsys.net, lenz@cs.wisc.edu, Dirk@opfer-online.de,
arminlitzel@web.de, Cyril Hrubis <metan@ucw.cz>,
thommycheck@gmail.com,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
dbaryshkov@gmail.com, omegamoon@gmail.com, eric.y.miao@gmail.com,
utx@penguin.cz, zaurus-devel@www.linuxtogo.org
Subject: Re: [POWER] battery calibration parameters from sysfs
Date: Mon, 14 Dec 2009 21:02:42 -0600 [thread overview]
Message-ID: <4B26FC52.6060307@billgatliff.com> (raw)
In-Reply-To: <ed62800912141543v2ab7ef63v4b6b2c33018b3296@mail.gmail.com>
Aras Vaichas wrote:
> Unfortunately the simple coulomb counting chips have the disadvantage
> that the CPU has to be running to accumulate the pulses. Of course,
> the pulses could wake the CPU from a suspend mode, but I'd rather not
> do that just to add "one" to a counter ...
>
Could you have the coulomb-counting chip connected to a tiny
microcontroller, or even a dedicated hardware counter? Then the main
CPU wouldn't need to wake as often, it could just ask the
microcontroller over I2C, or read/reset the hardware counter.
b.g.
--
Bill Gatliff
bgat@billgatliff.com
next prev parent reply other threads:[~2009-12-15 3:02 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-04 10:42 [POWER] battery calibration parameters from sysfs Linus Walleij
2009-12-04 10:42 ` Linus Walleij
2009-12-04 10:49 ` Mark Brown
2009-12-04 14:17 ` Mark Brown
2009-12-05 13:08 ` Linus Walleij
2009-12-05 13:08 ` Linus Walleij
2009-12-05 17:45 ` Mark Brown
2009-12-07 11:48 ` Mark Brown
2009-12-07 14:07 ` Linus Walleij
2009-12-07 14:07 ` Linus Walleij
2009-12-07 16:56 ` Mark Brown
2009-12-08 5:27 ` Brian Swetland
2009-12-08 10:28 ` Mark Brown
2009-12-13 13:24 ` Pavel Machek
2009-12-13 13:24 ` Pavel Machek
2009-12-13 13:24 ` Pavel Machek
2009-12-14 12:12 ` Mark Brown
2009-12-14 12:12 ` Mark Brown
2009-12-14 12:12 ` Mark Brown
2009-12-14 21:22 ` Pavel Machek
2009-12-14 21:22 ` Pavel Machek
2009-12-14 21:22 ` Pavel Machek
2009-12-14 23:43 ` Aras Vaichas
2009-12-14 23:43 ` Aras Vaichas
2009-12-14 23:43 ` Aras Vaichas
2009-12-15 3:02 ` Bill Gatliff [this message]
2009-12-15 3:02 ` Bill Gatliff
2009-12-15 3:02 ` Bill Gatliff
2009-12-15 22:58 ` Aras Vaichas
2009-12-15 22:58 ` Aras Vaichas
2009-12-15 22:58 ` Aras Vaichas
2009-12-15 23:32 ` Stanislav Brabec
2009-12-15 23:32 ` Stanislav Brabec
2009-12-15 23:32 ` Stanislav Brabec
2009-12-16 9:40 ` Andy Green
2009-12-16 9:40 ` Andy Green
2009-12-16 9:40 ` Andy Green
[not found] ` <4B28AAFC.5010108-/Zus8d0mwwtBDgjK7y7TUQ@public.gmane.org>
2009-12-18 8:48 ` Pavel Machek
2009-12-18 8:48 ` Pavel Machek
2009-12-18 8:48 ` Pavel Machek
[not found] ` <20091214121247.GB22388-HF5t3jzXg/6ND3a5+9QAFujbO/Zr0HzV@public.gmane.org>
2009-12-16 22:53 ` Pavel Machek
2009-12-16 22:53 ` Pavel Machek
2009-12-16 22:53 ` Pavel Machek
2009-12-13 13:19 ` Pavel Machek
2009-12-14 11:50 ` Mark Brown
2009-12-14 11:58 ` Pavel Machek
2009-12-14 12:14 ` Mark Brown
2009-12-04 11:34 ` Alexander Clouter
2009-12-06 20:52 ` Greg KH
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