From: Carlos Munoz <carlos@kenati•com>
To: Misbah khan <misbah_khan@engineer•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: Reading a config file in a driver ....
Date: Thu, 03 Jan 2008 10:43:44 -0800 [thread overview]
Message-ID: <477D2CE0.1050806@kenati.com> (raw)
In-Reply-To: <20080103163019.GA4223@lixom.net>
Olof Johansson wrote:
> On Wed, Jan 02, 2008 at 09:03:20PM -0800, Misbah khan wrote:
>
>> Hi all ....
>>
>> I am writing a LCD driver in which the default configuration for LCD would
>> be loded at the Init . This default configuration if keep in the driver then
>> for a change in default configuration we need to compile the driver which we
>> never want . Hence we want a .config file in /etc/lcd.config dir which could
>> be changed and the next boot will take this configuration as the default
>> configuration.
>>
>> I need to know How to read from the config file in the driver form the dir
>> /etc/lcd.config. The driver would be installed at boot up
>>
>
> The driver/kernel shouldn't read the file directly, if anything you
> should have a userspace tool that reads it and adjusts the driver via
> sysfs or similar. That tool can be run from some of the init scripts,
> or from the ramdisk in case you want to do it early.
>
What I've done in the past is to use module_param() to define variables
that get set when the module is loaded. Then all you need to do is edit
the /etc/modules file and change the parameter value. However, this
technique is only efficient if only a few parameters will ever change.
If you need to change more than a few parameters, Olof's suggestion
would be preferred.
Carlos
next prev parent reply other threads:[~2008-01-03 18:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-03 5:03 Reading a config file in a driver Misbah khan
2008-01-03 16:30 ` Olof Johansson
2008-01-03 18:43 ` Carlos Munoz [this message]
2008-01-04 8:32 ` Misbah khan
2008-01-04 20:58 ` Control not branching to the instruction present at resetvec i.e 0xfffffffc ravi.rao
2008-01-05 14:19 ` Misbah khan
2008-01-04 8:36 ` Reading a config file in a driver Misbah khan
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