platform_device:
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/io.h> #define DEVICE_NAME "ok6410_plat_btn" /*平台资源的定义,按键中断*/
static struct resource s3c_buttons_resource[] = {
[0]={
.start = IRQ_EINT(0),
.end = IRQ_EINT(0),
.flags = IORESOURCE_IRQ,
},
[1]={
.start = IRQ_EINT(1),
.end = IRQ_EINT(1),
.flags = IORESOURCE_IRQ,
},
[2]={
.start = IRQ_EINT(2),
.end = IRQ_EINT(2),
.flags = IORESOURCE_IRQ,
},
[3]={
.start = IRQ_EINT(3),
.end = IRQ_EINT(3),
.flags = IORESOURCE_IRQ,
},
[4]={
.start = IRQ_EINT(4),
.end = IRQ_EINT(4),
.flags = IORESOURCE_IRQ,
},
[5]={
.start = IRQ_EINT(5),
.end = IRQ_EINT(5),
.flags = IORESOURCE_IRQ,
}
}; static struct platform_device *s3c_buttons; static int __init platform_init(void)
{ s3c_buttons = platform_device_alloc(DEVICE_NAME,-1); //为平台设备s3c_buttons添加平台资源
platform_device_add_resources(s3c_buttons,&s3c_buttons_resource,6); /*平台设备的注册*/
platform_device_add(s3c_buttons); } static void __exit platform_exit(void)
{
platform_device_unregister(s3c_buttons);
} module_init(platform_init);
module_exit(platform_exit); MODULE_AUTHOR("Sola");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ok6410_buttons");
platform_driver:
#include <linux/module.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <mach/map.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/unistd.h>
#include <linux/device.h> #define DRIVER_NAME "ok6410_plat_btn" //定义并初始化等待队列头
static DECLARE_WAIT_QUEUE_HEAD(button_waitq); static volatile int ev_press = 0; static int key_value;
static struct device *buttons_dev; /* platform device attached to */
static struct resource *buttons_irq; static int button_irqs[6];//中断号 /*按键中断处理函数*/
static irqreturn_t buttons_interrupt(int irq, void *dev_id)
{
int i;
for(i=0; i<6; i++){
if(irq == button_irqs[i]){
//printk("==>interrput number:%d\n",irq);
key_value = i;
ev_press =1;
wake_up_interruptible(&button_waitq);
}
} return IRQ_RETVAL(IRQ_HANDLED); } static int s3c6410_buttons_open(struct inode *inode, struct file *file)
{
int i;
int err = 0;
/*注册中断*/
for(i=0; i<6; i++){
if (button_irqs[i] < 0)
continue; /*中断触发方式：下降沿触发，中断接口函数*/
err = request_irq(button_irqs[i],buttons_interrupt,IRQF_TRIGGER_FALLING,NULL,NULL);
if(err)
break;
} if (err) {
i--;
for (; i >= 0; i--) {
if (button_irqs[i] < 0) {
continue;
}
disable_irq(button_irqs[i]);
free_irq(button_irqs[i], NULL);
}
return -EBUSY;
} ev_press = 0;
return 0;
} static int s3c6410_buttons_close(struct inode *inode, struct file *file)
{
int i;
for (i=0; i<6; i++) {
if (button_irqs[i] < 0) {
continue;
}
free_irq(button_irqs[i],NULL);
}
return 0;
} static int s3c6410_buttons_read(struct file *filp, char __user *buff, size_t count, loff_t *offp)
{
unsigned long err;
if (!ev_press) {//如果键没有被按下
if (filp->f_flags & O_NONBLOCK)//如果是非阻塞模式，就直接返回
return -EAGAIN;
else
//阻塞，直到按键按下
wait_event_interruptible(button_waitq, ev_press);
}
ev_press = 0; //将键值送回到用户空间
err = copy_to_user(buff, &key_value, sizeof(key_value));
return sizeof(key_value);
} static unsigned int s3c6410_buttons_poll( struct file *file, struct poll_table_struct *wait)
{
unsigned int mask = 0;
poll_wait(file, &button_waitq, wait);//添加等待队列头
if (ev_press){
mask |= POLLIN | POLLRDNORM;
} //返回掩码
return mask;
} static struct file_operations ok6410_buttons_fops = {
.owner = THIS_MODULE,
.open = s3c6410_buttons_open,
.release = s3c6410_buttons_close,
.read = s3c6410_buttons_read,
.poll = s3c6410_buttons_poll,
}; //声明一个混杂设备,设备名称为"buttons"
static struct miscdevice ok6410_miscdev = { .minor = MISC_DYNAMIC_MINOR,
.name ="buttons",
.fops = &ok6410_buttons_fops,//操作集
}; /* device interface ，当发现匹配设备时会调用此函数*/
static int ok6410_buttons_probe(struct platform_device *pdev)
{
struct resource *res;
struct device *dev;
int ret;
int size;
int i; printk("probe:%s\n", __func__);
dev = &pdev->dev;
buttons_dev = &pdev->dev; /*平台资源获取*/
/*get irq number*/
for(i=0; i<6; i++){
//获取中断号
buttons_irq = platform_get_resource(pdev,IORESOURCE_IRQ,i);
if(buttons_irq == NULL){
dev_err(dev,"no irq resource specified\n");
ret = -ENOENT;
return ret;
}
button_irqs[i] = buttons_irq->start;
//printk("button_irqs[%d]=%d\n",i,button_irqs[i]);
} //注册混杂设备
ret = misc_register(&ok6410_miscdev); return ret;
} static int ok6410_buttons_remove(struct platform_device *dev)
{ misc_deregister(&ok6410_miscdev);
return 0;
} /*平台驱动定义*/
static struct platform_driver ok6410_buttons_driver = {
.probe = ok6410_buttons_probe,//探针函数
.remove = ok6410_buttons_remove,
.driver = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
},
}; static char banner[] __initdata =
"ok6410 Buttons Driver\n"; static int __init buttons_init(void)
{
printk(banner);
/*平台驱动注册*/
platform_driver_register(&ok6410_buttons_driver);
return 0;
} static void __exit buttons_exit(void)
{
//平台驱动的注销
platform_driver_unregister(&ok6410_buttons_driver);
} module_init(buttons_init);
module_exit(buttons_exit);
MODULE_LICENSE("GPL");