1 #include <linux/module.h> 2 #include <linux/kernel.h> 3 #include <linux/fs.h> 4 #include <linux/init.h> 5 #include <linux/delay.h> 6 #include <linux/irq.h> 7 #include <asm/uaccess.h> 8 #include <asm/irq.h> 9 #include <asm/io.h> 10 #include <linux/cdev.h> 11 #include <linux/device.h> 12 #include <linux/interrupt.h> 13 #include <linux/input.h> 14 #include <linux/bitmap.h> 15 #include <asm/gpio.h> 16 17 static struct input_dev *key_dev; 18 static struct timer_list key_time; 19 20 struct input_inode { 21 char *name; 22 unsigned int irq_type; 23 unsigned int pin; 24 int key_val; 25 }; 26 27 static struct input_inode *irq_pd; 28 29 static struct input_inode key[] = { 30 [0] = { 31 "L", 32 IRQ_EINT0, 33 S3C2410_GPF(0), 34 KEY_L}, 35 [1] = { 36 "S", 37 IRQ_EINT2, 38 S3C2410_GPF(2), 39 KEY_S}, 40 [2] = { 41 "ENTER", 42 IRQ_EINT11, 43 S3C2410_GPG(3), 44 KEY_ENTER}, 45 }; 46 47 //dev_id就是request_irq的最后一个参数，通过它可以知道是哪个中断发生了 48 static irqreturn_t key_irq(int irq, void *dev_id) 49 { 50 irq_pd = (struct input_inode *)dev_id; 51 mod_timer(&key_time,jiffies + HZ/100); //延迟10ms,延迟过程中断仍然可以被触发 52 53 return IRQ_HANDLED; 54 } 55 56 //input_report_key(adbhid[id]->input, KEY_VOLUMEDOWN, down); 57 static void key_time_function(unsigned long data) 58 { 59 unsigned int pinval; 60 61 if (!irq_pd) 62 return; //返回值为 void 的函数也可以使用return 63 64 pinval = s3c2410_gpio_getpin(irq_pd->pin); 65 66 if (pinval) 67 { 68 /* 松开 : 最后一个参数: 0-松开, 1-按下 */ 69 input_report_key(key_dev,irq_pd->key_val, 0); 70 //input_event(key_dev, EV_KEY, irq_pd->key_val, 0); 71 input_sync(key_dev); 72 } 73 else 74 { 75 /* 按下 */ 76 input_report_key(key_dev,irq_pd->key_val, 1); 77 //input_event(key_dev, EV_KEY, irq_pd->key_val, 1); 78 input_sync(key_dev); 79 } 80 } 81 82 static int input_key_init(void) 83 { 84 int error; 85 int i; 86 /*分配结构体*/ 87 key_dev = input_allocate_device(); 88 /*设置*/ 89 /*1.哪类事件*/ 90 set_bit(EV_KEY,key_dev->evbit); 91 set_bit(EV_REP,key_dev->evbit); 92 /*2. 哪些具体事件*/ 93 set_bit(KEY_L,key_dev->keybit); 94 set_bit(KEY_S,key_dev->keybit); 95 set_bit(KEY_ENTER,key_dev->keybit); 96 97 /*中断*/ 98 for(i = 0; i < 3; i++){ 99 error = request_irq(key[i].irq_type,key_irq,IRQ_TYPE_EDGE_BOTH,key[i].name,&key[i]); 100 if(error){ 101 printk("couldn't get irq! "); 102 return -1; 103 } 104 } 105 106 init_timer(&key_time); 107 key_time.function = key_time_function; 108 add_timer(&key_time); 109 110 /*注册*/ 111 error = input_register_device(key_dev); 112 if(error){ 113 printk("input_register_device error! "); 114 return -1; 115 } 116 117 return 0; 118 } 119 120 static void input_key_exit(void) 121 { 122 int i; 123 input_unregister_device(key_dev); 124 del_timer(&key_time); 125 for(i = 0; i < 3; i++){ 126 free_irq(key[i].irq_type,&key[i]); 127 } 128 input_free_device(key_dev); 129 } 130 131 module_init(input_key_init); 132 module_exit(input_key_exit); 133 134 MODULE_LICENSE("GPL"); 135 MODULE_AUTHOR("1653699780@qq.com");