驱动代码：
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/err.h> #include <linux/miscdevice.h> #include <mach/gpio.h>
#include <mach/regs-gpio.h>
#include <plat/gpio-cfg.h> #define DEVICE_NAME "beep3" #define BEEP_MAGIC 'k'
#define BEEP_START_CMD _IO (BEEP_MAGIC, 1)
#define BEEP_STOP_CMD _IO (BEEP_MAGIC, 2) static void beep3_stop(void) {
printk("in the beep3_stop!!\n");
s3c_gpio_cfgpin(S5PV210_GPD0(), S3C_GPIO_OUTPUT);
gpio_set_value(S5PV210_GPD0(), ); } static void beep3_start(void) {
printk("in the beep3_start!!\n");
s3c_gpio_cfgpin(S5PV210_GPD0(), S3C_GPIO_OUTPUT);
gpio_set_value(S5PV210_GPD0(), ); } static long beep3_ioctl(struct file *filep, unsigned int cmd,
unsigned long arg)
{
printk("in the beep3_ioctl!!\n");
switch ( cmd ) {
case BEEP_START_CMD: {
printk("in the start_cmd!!\n");
beep3_start(); break;
}
case BEEP_STOP_CMD: {
printk("in the stop_cmd!!\n");
beep3_stop(); break;
}
default: {
break;
}
} return ;
} static struct file_operations beep3_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = beep3_ioctl,
}; static struct miscdevice beep3_misc_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &beep3_fops,
}; static int __init beep3_dev_init(void) {
int ret; ret = gpio_request(S5PV210_GPD0(), DEVICE_NAME);
if (ret) {
printk("request GPIO %d failed\n",S5PV210_GPD0());
return ret;
}
s3c_gpio_cfgpin(S5PV210_GPD0(), S3C_GPIO_OUTPUT);
gpio_set_value(S5PV210_GPD0(), ); ret = misc_register(&beep3_misc_dev); printk(DEVICE_NAME "\tinitialized\n"); return ret;
} static void __exit beep3_dev_exit(void) {
beep3_stop(); misc_deregister(&beep3_misc_dev);
} module_init(beep3_dev_init);
module_exit(beep3_dev_exit); MODULE_LICENSE("GPL");
MODULE_AUTHOR("mhb@SEU");
MODULE_DESCRIPTION("S5PV210 beep Driver");
测试实例：
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#define BEEP_MAGIC 'k'
#define BEEP_START_CMD _IO (BEEP_MAGIC, 1)
#define BEEP_STOP_CMD _IO (BEEP_MAGIC, 2) int main(int argc ,char* argv[])
{
int m_fd=;//
m_fd = open("/dev/beep3", O_RDONLY); ioctl(m_fd, BEEP_STOP_CMD);
while()
{
printf("enter any key to start !!\n");
getchar();
ioctl(m_fd, BEEP_START_CMD);
printf("start success!!\n");
printf("enter any key to stop !!\n");
getchar();
ioctl(m_fd, BEEP_STOP_CMD);
}
close(m_fd);
return ;
}