Unable to build Linux kernel module out of static driver code

Question

I am trying to build a kernel module (.ko) out of a driver that doesn't have module configuration by default. I want to avoid having a built-in driver because I get firmware loading errors.

I did the following,

1. Bt_driver.c:

   module_int(BT_Driver_init);
   module_exit(BT_Driver_deinit);
   

2. Menuconfig:

   obj-$(CONFIG_BT_DRI) := Bt_driver.o
   

3. Kconfig:

   tristate "Bt Module " // So, I can select Y, N and M option
   

4. defconfig

   CONFIG_BT_DRI=m
   

After the build was done, I didn't find a Bt_driver.ko module in the build location.

Answer 1

After adding module_init() and module_exit() you may need to add the module license: MODULE_LICENSE("GPL"), for example.

Unless the module will not be built (tainted).

If its still not building the loadable module kernel, try to build using your own Makefile (for this module).