|
本帖最后由 手指恋上烟 于 2013-3-12 11:04 编辑
/*************************************
NAME:EmbedSky_hello.c
COPYRIGHT:www.embedsky.net
*************************************/
#include <linux/miscdevice.h>
#include <linux/input.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <mach/map.h>
#include <mach/gpio.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-bank-a.h>
#define DEVICE_NAME "GPIO-Control"
/* 应用程序执行ioctl(fd, cmd, arg)时的第2个参数 */
#define IOCTL_GPIO_ON 1
#define IOCTL_GPIO_OFF 0
/* 用来指定LED所用的GPIO引脚 */
static unsigned long gpio_table[] =
{
S3C64XX_GPA(4),
S3C64XX_GPA(5),
S3C64XX_GPA(6),
S3C64XX_GPA(7),
};
/* 用来指定GPIO引脚的功能:输出 */
static unsigned int gpio_cfg_table[] =
{
S3C64XX_GPA_OUTPUT(4),
S3C64XX_GPA_OUTPUT(5),
S3C64XX_GPA_OUTPUT(6),
S3C64XX_GPA_OUTPUT(7),
};
static int tq2440_gpio_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
if (arg > 4)
{
return -EINVAL;
}
switch(cmd)
{
case IOCTL_GPIO_ON:
s3c_gpio_setpin(gpio_table[arg], 0);
return 0;
case IOCTL_GPIO_OFF:
s3c_gpio_setpin(gpio_table[arg], 1);
return 0;
default:
return -EINVAL;
}
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = tq2440_gpio_ioctl,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init dev_init(void)
{
int ret;
int i;
for (i = 0; i < 4; i++)
{
s3c_gpio_cfgpin(gpio_table, gpio_cfg_table);
s3c_gpio_setpin(gpio_table, 1);
s3c_gpio_setpull(gpio_table, S3C_GPIO_PULL_NONE);
}
ret = misc_register(&misc);
printk (DEVICE_NAME" initialized\n");
return ret;
}
static void __exit dev_exit(void)
{
misc_deregister(&misc);
}
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("www.embedsky.net");
MODULE_DESCRIPTION("GPIO control for EmbedSky SKY2440/TQ2440 Board");
|
|