md/notes/kernel/irq_handler.md


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title:IRQ handler
keywords:kernel,linux,irq

# IRQ handler

Lets extend hello world driver. 

## Starting point

__Makefile__
```Makefile
obj-m += procfs_entry.o

KDIR ?= /lib/modules/$(shell uname -r)/build

all:
	make -C $(KDIR) M=$(PWD) modules

clean:
	make -C $(KDIR) M=$(PWD) clean
```

__procfs_entry.c__
```c
#include <linux/module.h>  /* Needed by all modules */
#include <linux/kernel.h>

int procfs_entry_init( void )
{
	printk(KERN_DEBUG "Hello Procfs!\n");
	return 0;
}

void procfs_entry_exit( void )
{
	printk(KERN_DEBUG "Exit Procfs!\n");
}

module_init( procfs_entry_init );
module_exit( procfs_entry_exit );

MODULE_LICENSE("GPL");
```


## List of procfs functions used

| Function name | Note |
|---|---|
| proc_mkdir | Create procfs directory |
| proc_create | Create procfs file |
| proc_remove | Remove procfs entry |

## Final result


## Links