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Asked: 2026-05-11T01:28:50+00:00

I’m developing a Linux driver loadable module and I have to use another device

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I’m developing a Linux driver loadable module and I have to use another device in my driver.(kind of driver stacked on another driver)

How do I call/use another driver in my driver? I think they are both in the kernel so there might be a way that can use another driver directly.

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  1. You will need the EXPORT_SYMBOL (or EXPORT_SYMBOL_GPL) macro. For example:

    /* mod1.c */ #include <linux/module.h> #include <linux/kernel.h> #include 'mod1.h' .... void mod1_foo(void) {     printk(KERN_ALERT 'mod1_foo\n'); } EXPORT_SYMBOL(mod1_foo);  /* mod2.h */ .... extern void mod1_foo(void); ....  /* mod2.c */ #include <linux/module.h> #include <linux/kernel.h> #include 'mod1.h' #include 'mod2.h' int init_module(void) {     mod1_foo();     ...

    This should be plain sailing, but you must of course be careful with the namespace – stomping on somebody else’s kernel module symbols would be unfortunate.

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