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myled.c
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#include <linux/module.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/delay.h>
MODULE_AUTHOR("Tanapol Hongsuwan, Yuya Sakamoto and Ryuichi Ueda");
MODULE_DESCRIPTION("driver for LED control");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.1");
static dev_t dev;
static struct cdev cdv;
static struct class *cls = NULL;
static volatile u32 *gpio_base = NULL;
static int led_num[3] = {17, 24, 25};
static ssize_t led_write(struct file* flip, const char* buf, size_t count, loff_t* pos)
{
char c;
if(copy_from_user(&c, buf, sizeof(char)))
return -EFAULT;
if(c == '0'){
gpio_base[10] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[10] = 1 << 25;
}
else if(c == '1'){
gpio_base[7] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[10] = 1 << 25;
}
else if(c == '2'){
gpio_base[10] = 1 << 17;
gpio_base[7] = 1 << 24;
gpio_base[10] = 1 << 25;
}
else if(c == '3'){
gpio_base[10] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[7] = 1 << 25;
}
else if (c == '4'){
gpio_base[7] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[10] = 1 << 25;
ssleep(1);
gpio_base[10] = 1 << 17;
gpio_base[7] = 1 << 24;
gpio_base[10] = 1 << 25;
ssleep(1);
gpio_base[10] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[7] = 1 << 25;
ssleep(1);
gpio_base[10] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[10] = 1 << 25;
ssleep(1);
gpio_base[7] = 1 << 17;
gpio_base[7] = 1 << 24;
gpio_base[7] = 1 << 25;
ssleep(3);
gpio_base[10] = 1 << 17;
gpio_base[7] = 1 << 24;
gpio_base[7] = 1 << 25;
ssleep(1);
gpio_base[10] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[7] = 1 << 25;
ssleep(1);
gpio_base[10] = 1 << 17;
gpio_base[10] = 1 << 24;
gpio_base[10] = 1 << 25;
}
return 1;
}
static struct file_operations led_fops = {
.owner = THIS_MODULE,
.write = led_write,
};
static int __init init_mod(void) // Kernel Module Initialization
{
int retval, i;
retval = alloc_chrdev_region(&dev, 0, 1, "myled");
if(retval < 0){
printk (KERN_ERR "alloc_chrdev_region failed.\n");
return retval;
}
printk(KERN_INFO "%s is loaded. major:%d\n",__FILE__,MAJOR(dev));
cdev_init(&cdv, &led_fops);
retval = cdev_add(&cdv, dev, 1);
if(retval < 0){
printk(KERN_ERR "cdev_add failed. major:%d, minor:%d",MAJOR(dev),MINOR(dev));
return retval;
}
cls = class_create(THIS_MODULE,"myled");
if(IS_ERR(cls)){
printk(KERN_ERR "class_create failed.");
return PTR_ERR(cls);
}
device_create(cls, NULL, dev, NULL, "myled%d",MINOR(dev));
gpio_base = ioremap_nocache(0xfe200000, 0xA0);
for(i = 0; i < 3; i++){
const u32 led = led_num[i];
const u32 index = led/10; //GPFSEL2=25gpio GPSEL1=17gpio
const u32 shift = (led%10)*3; //15bit=25gpio 21bit=17gpio
const u32 mask = ~(0x7 << shift);
gpio_base[index] = (gpio_base[index] & mask) |(0x1 << shift);
}
return 0;
}
static void __exit cleanup_mod(void)
{
cdev_del(&cdv);
device_destroy(cls,dev);
class_destroy(cls);
unregister_chrdev_region(dev, 1);
printk(KERN_INFO "%s is unloaded. major:%d\n",__FILE__,MAJOR(dev));
iounmap(gpio_base);
}
module_init(init_mod);
module_exit(cleanup_mod);