#define MODULE
#define __KERNEL__

#include <linux/module.h>
#include <linux/devfs_fs_kernel.h>
#include <asm/arch/hardware.h>

#define SONAR_DEV_MAJOR	23
#define SONAR_IDENT	"Sonar Device Driver Template"
#define SONAR		"SonarTemplate"

//Useful GPIO macros are defined in linux/include/asm-arm/arch/SA-1100.h

static ssize_t sonar_read(struct file * file, char * buffer, size_t count, loff_t *ppos) {
	// Be sure to honor blocking/nonblocking settings from open
	
	// Use the function below to copy from kernel to user space
	//__copy_to_user((void*)buffer, (void*)str, count);


	printk("<1>Read %s\n", SONAR_IDENT);
	return 0;
}

static ssize_t sonar_write(struct file* file, const char* buffer, size_t count, loff_t *ppos) {
	// Be sure to honor blocking/nonblocking settings from open
	
	// Use the function below to copy from user to kernel space
	// __copy_from_user((void*)str, (void*) buffer, count);
	
	printk("<1>Wrote %s\n", SONAR_IDENT);
	return count;
}

int sonar_open (struct inode* inode, struct file* file) {
	// Grab any resources our driver needs, including interrupt lines, memory ranges, ports, etc
	
	// Register Interrupt Routines ...
	
	// Manage mutual exclusion if necessary

	printk("<1>Opened %s\n", SONAR_IDENT);				
	return 0;
}	

int sonar_release(struct inode* inode, struct file* file) {
	// Release any resources, etc...
	
	printk("<1>Released %s\n", SONAR_IDENT);
	return 0;
}

static struct file_operations sonar_file_ops = {NULL,NULL,sonar_read,sonar_write,NULL,NULL,NULL,NULL,sonar_open, NULL, sonar_release,NULL,NULL};

int init_module(void) {
	printk("<1>Loading %s ...\n", SONAR_IDENT);

	if (register_chrdev(SONAR_DEV_MAJOR, SONAR, &sonar_file_ops)) {
		printk("<1>%s, cannot register major device %d\n", SONAR_IDENT, SONAR_DEV_MAJOR);
		return 1;
	}

	printk("<1>%s, Done.\n", SONAR_IDENT);
	return 0;
}

void cleanup_module(void) { printk("<1>Goodbye cruel world\n"); }