输入子系统代码测试

/* 参考drivers\input\keyboard\gpio_keys.c */#include <linux/module.h>#include <linux/version.h>#include <linux/init.h>#include <linux/fs.h>#include <linux/interrupt.h>#include <linux/irq.h>#include <linux/sched.h>#include <linux/pm.h>#include <linux/sysctl.h>#include <linux/proc_fs.h>#include <linux/delay.h>#include <linux/platform_device.h>#include <linux/input.h>#include <linux/irq.h>#include <asm/gpio.h>#include <asm/io.h>#include <asm/arch/regs-gpio.h>struct pin_desc{int irq;char *name;unsigned int pin;unsigned int key_val;};struct pin_desc pins_desc[4] = {{IRQ_EINT0,  "S2", S3C2410_GPF0,   KEY_L},{IRQ_EINT2,  "S3", S3C2410_GPF2,   KEY_S},{IRQ_EINT11, "S4", S3C2410_GPG3,   KEY_ENTER},{IRQ_EINT19, "S5",  S3C2410_GPG11, KEY_LEFTSHIFT},};static struct input_dev *buttons_dev;static struct pin_desc *irq_pd;static struct timer_list buttons_timer;static irqreturn_t buttons_irq(int irq, void *dev_id){/* 10ms后启动定时器 */irq_pd = (struct pin_desc *)dev_id;mod_timer(&buttons_timer, jiffies+HZ/100);//更改定时器超时时间return IRQ_RETVAL(IRQ_HANDLED);}static void buttons_timer_function(unsigned long data){struct pin_desc * pindesc = irq_pd;unsigned int pinval;if (!pindesc)return;pinval = s3c2410_gpio_getpin(pindesc->pin);if (pinval){/* 松开 : 最后一个参数: 0-松开, 1-按下 */input_event(buttons_dev, EV_KEY, pindesc->key_val, 0);input_sync(buttons_dev);}else{/* 按下 */input_event(buttons_dev, EV_KEY, pindesc->key_val, 1);input_sync(buttons_dev);}}static int buttons_init(void){int i;/* 1. 分配一个input_dev结构体 */buttons_dev = input_allocate_device();;/* 2. 设置 *//* 2.1 能产生哪类事件 */set_bit(EV_KEY, buttons_dev->evbit);/* 2.2 能产生这类操作里的哪些事件: L,S,ENTER,LEFTSHIT */set_bit(KEY_L, buttons_dev->keybit);set_bit(KEY_S, buttons_dev->keybit);set_bit(KEY_ENTER, buttons_dev->keybit);set_bit(KEY_LEFTSHIFT, buttons_dev->keybit);/* 3. 注册 */input_register_device(buttons_dev);/* 4. 硬件相关的操作 */init_timer(&buttons_timer);buttons_timer.function = buttons_timer_function;add_timer(&buttons_timer);for (i = 0; i < 4; i++){request_irq(pins_desc[i].irq, buttons_irq, IRQT_BOTHEDGE, pins_desc[i].name, &pins_desc[i]);}return 0;}static void buttons_exit(void){int i;for (i = 0; i < 4; i++){free_irq(pins_desc[i].irq, &pins_desc[i]);}del_timer(&buttons_timer);input_unregister_device(buttons_dev);input_free_device(buttons_dev);}module_init(buttons_init);module_exit(buttons_exit);MODULE_LICENSE("GPL");