beep.c

ARM9200在LINUX2.4.19下的蜂鸣器驱动程序,经过验证,直接可以应用.

/* 
* ----------------------------------------------------------------------------
*          ATMEL Microcontroller Software Support  -  ROUSSET  -
* ----------------------------------------------------------------------------
*  The software is delivered "AS IS" without warranty or condition of any
*  kind, either express, implied or statutory. This includes without
*  limitation any warranty or condition with respect to merchantability or
*  fitness for any particular purpose, or against the infringements of
*  intellectual property rights of others.
* ----------------------------------------------------------------------------
* File Name             : beep.c
* Object                : AT91RM9200 / BUZZ definitions
* Generated             : AT91 SW Application Group  01/17/2003 (13:41:22)
* AUTHOR		:Sun Qigang
* DATA			:2006-12-4
* ----------------------------------------------------------------------------
*/

#include <linux/fs.h>
#include <linux/iobuf.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/capability.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <asm/uaccess.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/arch/AT91RM9200_SYS.h>

#undef DEBUG
//#define DEBUG
#ifdef DEBUG
#define DPRINTK(x...)    printk("arm9200-beep:"##x)
#else
#define DPRINTK(x...)
#endif

#define BEEP		AT91C_PIO_PD11
#define DEVICE_NAME    "rm9200-beep"
#define BEEP_MAJOR 	220

#define IOWRITE	0xf021
#define IOCLEAR	0xf022

typedef char beep_device_t;	
static long beep_addr;
static devfs_handle_t 	beep_devfs_dir;

static beep_device_t	beep_devices[256];

static int rm9200_beep_open(struct inode *, struct file *);
static int rm9200_beep_release(struct inode *inode, struct file *filp);
static int rm9200_beep_ioctl(struct inode *, struct file *, unsigned int, unsigned long);

static struct file_operations rm9200_fops = 
{
	//owner:	THIS_MODULE,
	ioctl:	rm9200_beep_ioctl,
	open:	rm9200_beep_open,
	release:	rm9200_beep_release,
};

/* set beep related gpio */ 
static int rm9200_beep_open(struct inode *inode, struct file *filp)
{
	int minor;
	//MOD_INC_USE_COUNT;		//mode counts inc 1
	minor = MINOR(inode -> i_rdev);
	(void *)(beep_addr) = ioremap(0xfffffa00, 0x8);
	//printk("port addr is %x\n", beep_addr);
	*(volatile unsigned int *)(beep_addr) |= 0x00000800;
	iounmap((void *)(beep_addr));	
	(void *)(beep_addr) = ioremap(0xfffffa10, 0x8);
	//printk("port addr is %x\n", beep_addr);
	*(volatile unsigned int *)(beep_addr) |= 0x00000800;
	printk("beep open\n");
	beep_devices[minor]++;
	return 0;
}

/*
*  if buf[i] == 0 BEEP_OFF 
*  else BEEP_ON 
*/ 
int rm9200_beep_ioctl(struct inode *inode, struct file *flip, unsigned int command, unsigned long arg)
{
	int err = 0;
	//int minor = MINOR(inode -> i_rdev);
	switch(command){
		case IOWRITE:
			(void *)(beep_addr) = ioremap(0xfffffa38, 0x8);
			*(volatile unsigned int *)(beep_addr) &= ~0x00000800;
			/* printk("IO: beep write ok\n"); */
			return 0;
		case IOCLEAR:
			(void *)(beep_addr) = ioremap(0xfffffa38, 0x8);
			*(volatile unsigned int *)(beep_addr) |= 0x00000800;
			/* printk("IO: beep clear ok\n"); */
			return 0;
		default:
			err = -EINVAL;
	}
	iounmap((void *)(beep_addr));	
	return err;
}

static int rm9200_beep_release(struct inode *inode, struct file *filp)
{
	int minor;
	//MOD_DEC_USE_COUNT;	//mode counts dec 1
	iounmap((void *)(beep_addr));
	minor = MINOR(inode -> i_rdev);
	if(beep_devices[minor])
		beep_devices[minor]--;	
	//printk("beep release\n");
	return 0;
}

static int __init rm9200_beep_init(void)
{
	//int ret, i;

	//ret = register_chrdev(0, DEVICE_NAME, &rm9200_fops);
	beep_devfs_dir = devfs_register(NULL, DEVICE_NAME, DEVFS_FL_DEFAULT, BEEP_MAJOR, 0, S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, &rm9200_fops, NULL);
/*
	if(ret < 0){
		printk(DEVICE_NAME "can't get major number\n");
		return ret;
	}

	DbBeepMajor = ret;
*/
	//printk(DEVICE_NAME "initialized\n");
	
	return 0;
}


static void __exit rm9200_beep_exit(void)
{
	//unregister_chrdev(DbBeepMajor, DEVICE_NAME);
	//iounmap((void *)(beep_addr));
	devfs_unregister(beep_devfs_dir);
	//printk("beep driver uninstalled ok\n");
}

module_init(rm9200_beep_init);
module_exit(rm9200_beep_exit);

MODULE_AUTHOR("Sun Qigang");
MODULE_DESCRIPTION("gpio(beep) driver for at91rm9200");
MODULE_LICENSE("GPL");