Linux 定時器 延時工作佇列 外部中斷例程

先上**：

#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define gpio_max_num	256

#define timer_timeout_value 1
#define work_delay_value 1
#define use_timer 0
#define use_delay_work 1
#define dev_name "data_dect"
int irq_num = 0;
int irq_gpio = 0;
int pad_sai2_rxd = 0;
struct timer_list timer;
static struct delayed_work delay_work1;
int major;
static struct class *mod_class;
struct device *mod_dev;
dev_t devt;
struct completion data_dect_completion;
//裝置檔案寫函式
static ssize_t data_dect_write(struct file *filp, const char __user *buf, size_t count, loff_t *f_ops)
//呼叫read返回，就說明出現了空白的現象
static ssize_t data_dect_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)
static long data_dect_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
static int data_dect_open(struct inode *node, struct file *filp)
static const struct file_operations data_dect_fops =
;static irqreturn_t irq_handler_func(int irq, void *dev)
void timer_function(unsigned long arg)
else }
//中斷裡面啟動延時工作佇列
//延時時間到時，開始執行下面的函式
static void delay_work_func(struct work_struct *work) }
static int __init mod_init(void)
irq_gpio = of_get_named_gpio(dts_of_node, "int-gpios", 0);
if(irq_gpio < 0) 
pad_sai2_rxd = of_get_named_gpio(dts_of_node, "pad_sai2_rxd", 0);
if(gpio_is_valid(pad_sai2_rxd)) 
} else 
irq_num = irq_of_parse_and_map(dts_of_node, 0); //獲取中斷號
if(irq_num < 0) 
ret = request_irq(irq_num, irq_handler_func, irqf_trigger_rising, "gpio_interrupt", null); //申請中斷，上公升沿觸發
if(ret < 0) 
#if use_timer
init_timer(&timer); //初始化定時器 
timer.expires = jiffies+timer_timeout_value;
timer.function = timer_function;
add_timer(&timer);
#endif
#if use_delay_work
init_delayed_work(&delay_work1, delay_work_func);
schedule_delayed_work(&delay_work1, msecs_to_jiffies(work_delay_value)); 
#endif 
init_completion(&data_dect_completion); //初始化完成量
//建立裝置節點
major = register_chrdev(0, dev_name, &data_dect_fops); //註冊字元裝置 返回主裝置號
if(major < 0) 
mod_class = class_create(this_module, dev_name); //建立類
if (is_err(mod_class)) 
mod_dev = device_create(mod_class, null, mkdev(major, 0), null, dev_name); //建立裝置
if(is_err(mod_dev)) 
return 0; 
error5:
class_destroy(mod_class);
error4:
unregister_chrdev(major, dev_name); 
error3:
#if use_timer
del_timer(&timer);
#endif 
#if use_delay_work
cancel_delayed_work_sync(&delay_work1);
#endif
error2: 
gpio_free(pad_sai2_rxd);
error1:
return -1; 
}module_init(mod_init);
static void __exit mod_exit(void)
module_exit(mod_exit);
module_author("lqd");
module_license("gpl");

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