//***************************************
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/timer.h> /*timer*/
#include <asm/uaccess.h> /*jiffies*/
#include <linux/delay.h>
#include <linux/interrupt.h> //request_irq
#include <mach/irqs.h> //中断号，已包含plat/irqs.h
#include <linux/fs.h>
#include <linux/device.h> //class_create device_create
#include <mach/regs-gpio.h>
#include <linux/io.h> //ioremap ioread32 iowrite32
#include <linux/sched.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/poll.h>
#include <mach/gpio.h>
#include <linux/gpio.h>
#include <mach/gpio.h>
#include <plat/gpio-cfg.h>
static struct class *sixthtimerdrv_class;
static struct class_device*sixthtimerdrv_class_dev;
struct semaphore button_lock;
static struct timer_list buttons_timer;
static struct fasync_struct *button_async;
static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
/* 中断事件标志, 中断服务程序将它置1，sixthtimer_drv_read将它清0 */
static volatile int ev_press = 0;
struct led_reg {
u32 gpm4con;
u8 gpm4dat;
};
static struct led_reg *led_reg;
struct key_reg {
u32 gpm4con;
u8 gpm4dat;
};
static struct key_reg *key_reg;
struct beep_reg {
u32 gpm4con;
u8 gpm4dat;
};
static struct key_reg *beep_reg;
struct pin_desc{
unsigned int pin;
unsigned int key_val;
};
/* 键值: 按下时, 0x01, 0x02, 0x03, 0x04 */
/* 键值: 松开时, 0x81, 0x82, 0x83, 0x84 */
static unsigned char key_val;
struct pin_desc pins_desc[4] = {
{EXYNOS4_GPX3(2), 0x01},
{EXYNOS4_GPX3(3), 0x02},
{EXYNOS4_GPX3(4), 0x03},
{EXYNOS4_GPX3(5), 0x04},
};
static struct pin_desc *irq_pd;
int major;
/*
* 确定按键值
*/
static irqreturn_t buttons_irq(int irq, void *dev_id)
{
printk("buttons_irq\n");
/* 10ms后启动定时器 */
irq_pd = (struct pin_desc *)dev_id;
mod_timer(&buttons_timer, jiffies+HZ/100);
return IRQ_RETVAL(IRQ_HANDLED);
}
static int sixthtimer_drv_open(struct inode *inode, struct file *file)
{
int ret;
printk("sixthtimer_drv_open\n");
#if 0
if (!atomic_dec_and_test(&canopen))
{
atomic_inc(&canopen);
return -EBUSY;
}
#endif
if (file->f_flags & O_NONBLOCK)
{
if (down_trylock(&button_lock))
return -EBUSY;
}
else
{
/* 获取信号量 */
down(&button_lock);
}
//配置4个按键为输入状态，因为按键是从GPXCON[2]开始的，所以要左移8位到对应的位置，将8位以后的16位清0
//这样的话就将按键配置的寄存器设置为输入状态了，因为输入是0x0
key_reg->gpm4con &= ~((0xf<<(2*4)) | (0xf<<(3*4)) | (0xf<<(4*4)) | (0xf<<(5*4)));
//先对LED的端口进行清0操作
led_reg->gpm4con &= ~((0xf<<(3*4)) | (0xf<<(2*4)) | (0xf<<(1*4)) | (0xf<<(0*4)));
//将4个IO口16位都设置为Output输出状态
led_reg->gpm4con |= ((0x1<<(3*4)) | (0x1<<(2*4)) | (0x1<<(1*4)) | (0x1<<(0*4)));
//清寄存器
beep_reg->gpm4con &= ~(0xf);
//设置io为输出
beep_reg->gpm4con |= (0x1);
ret = request_irq(IRQ_EINT(26), buttons_irq, IRQF_TRIGGER_FALLING , "k1", &pins_desc[0]);
ret =request_irq(IRQ_EINT(27), buttons_irq, IRQF_TRIGGER_FALLING , "k2", &pins_desc[1]);
ret =request_irq(IRQ_EINT(28), buttons_irq, IRQF_TRIGGER_FALLING , "k3", &pins_desc[2]);
ret =request_irq(IRQ_EINT(29), buttons_irq, IRQF_TRIGGER_FALLING , "k4", &pins_desc[3]);
return 0;
}
ssize_t sixthtimer_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{
printk("sixthtimer_drv_read\n");
if (size != 1)
return -EINVAL;
if (file->f_flags & O_NONBLOCK)
{
if (!ev_press)
return -EAGAIN;
}
else
{
/* 如果没有按键动作, 休眠 */
wait_event_interruptible(button_waitq, ev_press);
}
/* 如果有按键动作, 返回键值 */
copy_to_user(buf, &key_val, 1);
ev_press = 0;
return 1;
}
int sixthtimer_drv_close(struct inode *inode, struct file *file)
{
//atomic_inc(&canopen);
led_reg->gpm4dat |= ((1<<0) | (1<<1) |(1<<2)| (1<<3)) ;
beep_reg->gpm4dat &=~0x1 ; //蜂鸣器不响
free_irq(IRQ_EINT(26), &pins_desc[0]);
free_irq(IRQ_EINT(27), &pins_desc[1]);
free_irq(IRQ_EINT(28), &pins_desc[2]);
free_irq(IRQ_EINT(29), &pins_desc[3]);
up(&button_lock);
return 0;
}
int sixthtimer_drv_write(struct file *filp , const char __user *buf , size_t count , loff_t *f_pos)
{
int val;
printk("sixthtimer_drv_write\n");
//注意，这里是在内核中进行操作，我们需要使用copy_from_user这个函数将用户态的内容拷贝到内核态
copy_from_user(&val, buf, count);
switch(val)
{
case 1:
printk(KERN_EMERG"led1_on\n");
led_reg->gpm4dat &= ~(1<<0) ;
printk(KERN_EMERG"beep_on\n");
beep_reg->gpm4dat |= 0x1 ;
break ;
case 2:
printk(KERN_EMERG"led2_on\n");
led_reg->gpm4dat &= ~(1<<1) ;
printk(KERN_EMERG"beep_off\n");
beep_reg->gpm4dat &=~0x1 ; //蜂鸣器不响
break ;
case 3:
printk(KERN_EMERG"led3_on\n");
led_reg->gpm4dat &= ~(1<<2) ;
printk(KERN_EMERG"beep_on\n");
beep_reg->gpm4dat |= 0x1 ;
break ;
case 4:
printk(KERN_EMERG"led4_on\n");
led_reg->gpm4dat &= ~(1<<3) ;
printk(KERN_EMERG"beep_off\n");
beep_reg->gpm4dat &=~0x1 ; //蜂鸣器不响
break ;
}
return 0;
}
static unsigned sixthtimer_drv_poll(struct file *file, poll_table *wait)
{
printk("sixthtimer_drv_poll\n");
unsigned int mask = 0;
poll_wait(file, &button_waitq, wait); // 不会立即休眠
if (ev_press)
mask |= POLLIN | POLLRDNORM;
return mask;
}
static int sixthtimer_drv_fasync (int fd, struct file *filp, int on)
{
printk("driver: sixthtimer_drv_fasync\n");
return fasync_helper (fd, filp, on, &button_async);
}
static struct file_operations sencod_drv_fops = {
.owner = THIS_MODULE, /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
.open = sixthtimer_drv_open,
.read =sixthtimer_drv_read,
.release = sixthtimer_drv_close,
.poll = sixthtimer_drv_poll,
.fasync = sixthtimer_drv_fasync,
.write = sixthtimer_drv_write,
};
static void buttons_timer_function(unsigned long data)
{
printk("buttons_timer_function\n");
struct pin_desc * pindesc = irq_pd;
unsigned int pinval;
if (!pindesc)
return;
pinval = gpio_get_value(pindesc->pin);
if (pinval)
{
/* 松开 */
key_val = 0x80 | pindesc->key_val;
}
else
{
/* 按下 */
key_val = pindesc->key_val;
}
ev_press = 1; /* 表示中断发生了 */
wake_up_interruptible(&button_waitq); /* 唤醒休眠的进程 */
kill_fasync (&button_async, SIGIO, POLL_IN);
}
static int sixthtimer_drv_init(void)
{
init_timer(&buttons_timer);
buttons_timer.function = buttons_timer_function;
//buttons_timer.expires = 0;
add_timer(&buttons_timer);
major = register_chrdev(0, "sixthtimer_drv", &sencod_drv_fops);
sixthtimerdrv_class = class_create(THIS_MODULE, "sixthtimer_drv");
/* 为了让mdev根据这些信息来创建设备节点 */
sixthtimerdrv_class_dev = device_create(sixthtimerdrv_class, NULL, MKDEV(major, 0), NULL, "chenhaipan"); /* /dev/buttons */
led_reg = ioremap(0x110002e0, sizeof(struct led_reg));
beep_reg = ioremap(0x114000A0, sizeof(struct beep_reg));
key_reg = ioremap(0x11000C60, sizeof(struct key_reg));
sema_init(&button_lock, 1);
return 0;
}
static void sixthtimer_drv_exit(void)
{
unregister_chrdev(major, "sixthtimer_drv");
device_destroy(sixthtimerdrv_class, MKDEV(major, 0));
class_destroy(sixthtimerdrv_class);
iounmap(led_reg);
iounmap(beep_reg);
iounmap(key_reg);
}
module_init(sixthtimer_drv_init);
module_exit(sixthtimer_drv_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("xiangtan da xue chenhaipan");
MODULE_VERSION("2017.5.4");
//*********************************************
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <poll.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
/* sixthdrvtest
*/
int fd;
void my_signal_fun(int signum)
{
unsigned char key_val;
read(fd, &key_val, 1);
printf("key_val: 0x%x\n", key_val);
}
int main(int argc, char **argv)
{
unsigned char key_val;
int ret;
int Oflags;
//signal(SIGIO, my_signal_fun);
struct pollfd fds[1];
fd = open("/dev/chenhaipan", O_RDWR);
if (fd < 0)
{
printf("can't open!\n");
return -1;
}
fds[0].fd = fd;
fds[0].events = POLLIN;
//fcntl(fd, F_SETOWN, getpid());
//Oflags = fcntl(fd, F_GETFL);
//fcntl(fd, F_SETFL, Oflags | FASYNC);
while (1)
{
ret = poll(fds, 1, 5000);
if (ret == 0)
{
//write(fd, &key_val,1);
printf("time out\n");
}
{
ret = read(fd, &key_val, 1);
//write(fd, &key_val,1);
printf("key_val: 0x%x, ret = %d\n", key_val, ret);
//sleep(5);
}
}
return 0;
}