linux-kernel - Re: [PATCH] power: bq27x00_battery: Export all battery registers via sysfs

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Message-Id: <201303262027.39772@pali>
Date:	Tue, 26 Mar 2013 20:27:39 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	"Lars-Peter Clausen" <lars@...afoo.de>
Cc:	Anton Vorontsov <cbouatmailru@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: bq27x00_battery: Export all battery registers via sysfs

On Sunday 20 January 2013 10:53:01 Lars-Peter Clausen wrote:
> On 01/19/2013 03:01 PM, Pali Rohár wrote:
> > bq27xxx batteries have a lot of properties, more than
> > power_supply interface. Some of them can be usefull for
> > userspace applications (like CI bit) but does not make
> > sense to add bq specified property to power_supply
> > interface. When bq27x00_battery is not loaded userspace
> > application (like i2cget) can use /dev/i2c-* interface for
> > raw access. But when kernel module is attached to i2c
> > device, userspace applications cannot access it via
> > /dev/i2c-*.
> 
> You can still access it if you use the I2C_SLAVE_FORCE flag.
> This is a bit ugly, but I'd rather see an ugly hack in
> userspace than in kernel space.
> 

What is I2C_SLAVE_FORCE flag doing? Isnt there some potential 
hardware damage problems (like simultaneous access to i2c bus)?

-- 
Pali Rohár
pali.rohar@...il.com

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