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s3c2410_gpio_setpin这个函数怎么用?

发布时间:2014-08-26 23:12:42来源:红联作者:yezhiba
这个是led流水灯的驱动源代码,如戏下:

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#define DEVICE_NAME "leds"
#define LED_MAJOR 231

static unsigned long led_table [] = {
S3C2410_GPB5,
S3C2410_GPB6,
S3C2410_GPB8,
S3C2410_GPB10,

};

static unsigned int led_cfg_table [] = {
S3C2410_GPB5_OUTP, //0x01<<10 defined in refg-gpio.h
S3C2410_GPB6_OUTP,
S3C2410_GPB8_OUTP,
S3C2410_GPB10_OUTP,
};

static int s3c2440_leds_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
switch(cmd) {
case 0:
case 1:
if (arg > 4) { //这里是判断什么的?
return -EINVAL;
}
s3c2410_gpio_setpin(led_table[arg], !cmd);//这个函数怎么用?
return 0;
default:
return -EINVAL;
}
}

static struct file_operations s3c2440_leds_fops = {
.owner = THIS_MODULE,
.ioctl = s3c2440_leds_ioctl,
};

static int __init s3c2440_leds_init(void)
{
int ret;
int i;

ret = register_chrdev(LED_MAJOR, DEVICE_NAME, &s3c2440_leds_fops);
if (ret < 0) {
printk(DEVICE_NAME " can't register major number\n");
return ret;
}

devfs_mk_cdev(MKDEV(LED_MAJOR, 0), S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, DEVICE_NAME);

for (i = 0; i < 4 ; i++) {
s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]);//这个函数怎么用?
s3c2410_gpio_setpin(led_table[i], 1);//这个函数怎么用?
}

printk(DEVICE_NAME " initialized\n");
return 0;
}

static void __exit s3c2440_leds_exit(void)
{
devfs_remove(DEVICE_NAME);
unregister_chrdev(LED_MAJOR, DEVICE_NAME);
}

module_init(s3c2440_leds_init);
module_exit(s3c2440_leds_exit);
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