linux-kernel - Re: [PATCH 8/9] bq27x00: Add miscdevice for each battery with ioctl for reading registers

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Date:	Mon, 05 Dec 2011 20:37:23 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Anton Vorontsov <cbouatmailru@...il.com>,
	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	syed rafiuddin <rafiuddin.sayed@...il.com>,
	Rodolfo Giometti <giometti@...ux.it>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 8/9] bq27x00: Add miscdevice for each battery with ioctl for reading registers

On Sunday 27 November 2011 11:54:16 Mark Brown wrote:
> On Sat, Nov 26, 2011 at 02:04:48AM +0400, Anton Vorontsov wrote:
> > What would be more practical, is to allow I2C core to provide
> > userspace interface even for already bound I2C devices.
> > 
> > That could be some kind of CONFIG_I2C_UNSAFE_DEBUG: when
> > selected I2C core would allow access to all I2C devices. But still,
> > the niche for such a feature is tiny, so I doubt that it is worth
> > doing at all.
> 
> I don't know if it's applicable here but if this is a device that has
> registers that fit within regmap then the regmap API provides a debugfs
> interface for dumping the register map as standard.

I do not know regmap api, but I need interface which is easy readable from C 
or shell scripts and which can read some registers (numbers 0-N).

These patches I written for Nokia N900. Now I need interface available in 
kernel 2.6.28, which is only version working with Maemo (default N900 system). 
Of course upstreaming *all* N900 drivers is needed, because I belive that one 
day I will download vanilla kernel and run it on N900.

Anton Vorontsov, is simple debugfs interface (files - or only one file - which 
have names of register numbers) acceptable for upstreaming (instead this 
miscdevice with ioctl)?

-- 
Pali Rohár
pali.rohar@...il.com
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