arm驱动（6） include, linux

yuyang911220

/*gpio_mod.c*/

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

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/console.h>
#include <linux/parport.h>
#include <linux/lp.h>
#include <linux/interrupt.h>
#include <asm/arch-s3c2410/irqs.h>
#include <asm/uaccess.h>
#include <asm/arch-s3c2410/regs-serial.h>
#include <asm/arch-s3c2410/regs-irq.h>

#define keyirq_MAJOR 242

#define NOKEY '0'
#define KEY1  '1'
#define KEY2  '2'
#define KEY3  '3'
#define KEY4  '4'
#define KEY5  '5'


static struct semaphore key_sem;
static char key=NOKEY;

static void inline clearIrq(void)
{
    /*respond to EINT4-EINT7*/
    __raw_writel(0xf0, S3C2410_EINTPEND);
    __raw_writel(0x13, S3C2410_SRCPND);
    __raw_writel(0x13, S3C2410_INTPND);

}

static void key1_irq_isr(int irq, void *dev_id, struct pt_regs *regs)
{
    clearIrq();
    key = KEY1;
    up(&key_sem);

//    return 0;
}

static irqreturn_t key2_irq_isr(int irq, void *dev_id, struct pt_regs *regs)
{
    clearIrq();
    key = KEY2;
    up(&key_sem);

    return 0;
}

static irqreturn_t key3_irq_isr(int irq, void *dev_id, struct pt_regs *regs)
{
    clearIrq();
    key = KEY3;
    up(&key_sem);

    return 0;
}

static ssize_t keyirq_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)
{
    down_interruptible(&key_sem);
    put_user(key, buf);
    key = NOKEY;

    return 1;
}