s3c2410_mykbd_drv.c

在2410下按键程序

/* This program was generated by Guo Pan in June, 2006. And modified 
by KGB in March, 2007. The key "IRQ_EINT11" is modified as the output
signal of "LCD ON" */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/kbd_kern.h>	/* for keyboard_tasklet */
#include <linux/kbd_ll.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/keyboard.h>
#include <asm/errno.h>

#define LCDON 1 /* Turn on LCD */
#define LCDOFF 0 /* Turn off LCD */

#define KK_1		0x02   /* EINT0 key scancode */
#define KK_2		0x03   /* EINT2 key scancode */
#define KK_3		0x04   /* EINT11 key scancode */

 /*按键所使用的CPU资源*/
static struct key_info
{
	int irq_no;
	unsigned int gpio_port;
	int key_no;
} key_info_tab [] ={
//				{ IRQ_EINT0, GPIO_F0, KK_1 },
				{ IRQ_EINT2, GPIO_F2, KK_2 },
				{ IRQ_EINT11, GPIO_G3, KK_3 }
				};


/*按键的中断服务程序*/
static void key_interrupt(int irq, void *dev_id, struct pt_regs *reg)
{
		struct key_info *k;
		int found = 0;
		int i = 0;
//		int key = 1;

		cli();
		mdelay(20); // 消除按键按下的抖动

//		save_flags(flags);
//		
	
		for (i = 0; i < sizeof (key_info_tab) / sizeof (key_info_tab[1]); i++) 
		{
			k = key_info_tab + i;
			if ((k->irq_no == irq)  && ((read_gpio_bit(k->gpio_port)  & 0x01) == 0))
			{
				found = 1;
				break;
			}
		}

		set_external_irq(k->irq_no, EXT_FALLING_EDGE, GPIO_PULLUP_DIS);

		if (!found) 
		{
			printk("bad irq %d in keyboard \n", irq);
		}
		else
		{
			printk("key KK_%d is pressed. \n", k->key_no-1);
			handle_scancode(k->key_no, 1);
//			printk("handle scancode done. \n");
  			tasklet_schedule(&keyboard_tasklet);
//			printk("keyboard tasklet done. \n");
			handle_scancode(k->key_no, 0);
//			printk("handle scancode done. \n");
  			tasklet_schedule(&keyboard_tasklet);
		}

}

/*申请系统中断，中断方式在下降沿发生中断*/
static int request_irqs(void)
{
	struct key_info *k;
	int i;
	for (i = 0; i < sizeof key_info_tab / sizeof key_info_tab[1]; i++) 
	{
		k = key_info_tab+i;
		set_external_irq(k->irq_no, EXT_FALLING_EDGE, GPIO_PULLUP_DIS );
		if (request_irq(k->irq_no, key_interrupt, SA_INTERRUPT, "GPIO_Keyboard", key_interrupt))
		return -1;
	}
	return 0;
}

/*释放中断*/
static void free_irqs(void)
{
	struct key_info *k;
	int i;
	for (i = 0; i < sizeof key_info_tab / sizeof key_info_tab[1]; i++) 
	{
		k = key_info_tab + i;
		free_irq(k->irq_no, key_interrupt);
	}
}

/* 初始化中断*/
static int __init s3c2410_kbd_init(void)
{
    int ret = -ENODEV;
  //  int delay ;

    ret = request_irqs();
    printk("%d \n",ret);
	
    
    if (ret) {
      printk(KERN_INFO "request IRQ failed (%d)\n", IRQ_KBD);
      return ret;
    }

/* Turn on LCD */
	set_gpio_ctrl(GPIO_G3 | GPIO_MODE_OUT);
	write_gpio_bit(GPIO_G3, LCDON); 

    return ret;
}

/* 扫描码到键盘码的转换 
static int my_kbd_translate(u_char scancode, u_char *keycode, char raw_mode)
{
//    *keycode = scancode & 0x7f;
    *keycode = scancode;
    return 1;
}


static int __init my_kbd_init(void) {
    int  ret = -ENODEV;

    ret = HW_kbd_init();
    if (ret < 0)
      return ret;

    // include/asm/keyboard.h , we have not key_ops_struct 
    k_translate		= my_kbd_translate;

    return 0;
}
*/

static void __exit s3c2410_kbd_exit(void)
{
	free_irqs();
	
/* Turn off LCD */
	write_gpio_bit(GPIO_G3, LCDOFF);  
	set_gpio_ctrl(GPIO_G3 | GPIO_MODE_IN);
}

module_init(s3c2410_kbd_init);
module_exit(s3c2410_kbd_exit);
MODULE_LICENSE("GPL");