Driver on Linux

Samuel Ortiz samuel.ortiz at
Mon Jun 30 17:00:51 EST 2003

On Fri, 27 Jun 2003 Christophe.LINDHEIMER at wrote:

> Hi.
> I am working on a PPC860.
> I have developped two drivers.
> The driver 2 needs to use functions that are in driver 1.
> driver 1 is /dev/visu.
> I thought I could make fd=open("/dev/visu", 0) in init of the driver 2 but I
> get ooops.

Kernel file opening is usually considered a very bad idea. If driver 2
needs some of driver 1 functions, then you should consider exporting these
functions from driver 1 (EXPORT(driver1_function);).
Once driver1 is loaded, and thus initialized, any other driver will be
able to call driver 1 exported functions.

Hope this helps,

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