gistfile1.txt

To compile linux drivers

1 - You must have a correct environment with the linux headers for your kernel or for the kernel you are compiling the driver maybe you are crosscompiling the driver
	thing that I don't know it is possible.
	* For orangepi 5 plus the kernel and ubuntu 22.04 jammy header are in /opt
	  when I am writing this the package is: /opt/linux-headers-legacy-rockchip-rk3588_1.0.6_arm64.deb for the kernel 5.10.110-rockchip-rk3588, use uname -r to get your 
	  kernel version.
	* Some distributions you can use apt-get install linux-headers$('shell uname -r')
	* Unforunately you will must discover how to get your linux kernel headers.

2 - The header home is: /usr/src/linux-headers-5.10.110-rockchip-rk3588
	* This is the path header must reside.
	
3 - The modules home is: /lib/modules/5.10.110-rockchip-rk3588/kernel		

4 - You can compile you driver in your projects directory since you have a Makefile
	like this:
	Makefile
	+---------------------------------------------------------------------------+
	|	obj-m += hello.o														                              |	
	|																			                                      |
	|	all:																	                                    |
	|		make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules	        	|
	|																	                                      		|
	|	clean:															                                  		|
	|		make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean		        	|
	+---------------------------------------------------------------------------+
	
	hello.c
	+---------------------------------------------------------------------------+
	|#include <linux/module.h>													                        |
	|#include <linux/init.h>											  		                        |
	|																			                                      | 
	|/*Meta information*/													    	                        |
	|MODULE_LICENSE("GPL");												  		                        |
	|MODULE_AUTHOR("Paulo da Silva");											                      |
	|MODULE_DESCRIPTION("My first driver in orange pi");						            |
	|MODULE_INFO(intree, "Y");													                        |
	|																			                                      |
	|static int __init ModuleInit(void)											                    |
	|{																			                                    |
	|	printk("hello: Input - This is my first Kernel driver ");		    |
	|	return(0);																                                |
	|}																			                                    | 
	|																			                                      |
	|static void __exit ModuleExit(void)										                    |
	|{																			                                    |
	|	printk("hello: Output - Module exiting...");					          |
	|}																			                                    |
	|																			                                      |
	|module_init(ModuleInit);													                          |
	|module_exit(ModuleExit);													                          |
	|																			                                      |
	+---------------------------------------------------------------------------+
		
5 - To compile: [make all] as simple as that
	* - When compiled, copy you driver in this case hello.ko to: 
		cd /lib/modules/5.10.110-rockchip-rk3588/kernel/drivers
		mkdir hello
		cd hello
		cp <your project dir>/hello.ko .
		
6 - After your driver is compiled you must run the command depmod as root in 
	directory: /lib/modules/5.10.110-rockchip-rk3588
	cd /lib/modules/5.10.110-rockchip-rk3588
	depmod