Reading a config file in a driver ....

Misbah khan misbah_khan at
Fri Jan 4 19:32:21 EST 2008

i appriciate your concept and i need to know this :-

The config should be in a structure or a bit mask . The user will have to
change the value whenever he needs to change the default config. Where
should i put that struct or bit field defination ???? He should know it
preciesly before he change ????

Can you share with me your Implimentation so that i could get the exactly
how you had done ...

----Misbah < ><

Carlos Munoz-2 wrote:
> 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
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