向TX2440添加锋鸣器驱动

时间：2010-11-16 来源：1987hanen

1。把驱动编译成模块    考备TX2440-beep.c放到drivers/char目录下，修改Kconfig文件，加入        config TX2440_BEEP           tristate "TX2440 BEEP Driver"            depends on ARCH_S3C2440            help              this is BEEP Driver for TX2440 development boards 修改Makefile文件加入 obj-$(CONFIG_TX2440_BEEP)     +=TX2440_beep.o 配置内核，支持驱动模块 Device Drivers -->        Character devices -->         [M] TX2440 BEEP Driver 执行#make M=driver/char/ modules 编译完后，会在目录drivers/char下生成TX2440_Beep.ko文件，将其自制到根文件系统下lib/modules/2/6/31目录下 2，向内核中添加驱动， #insmod lib/modules/2.6.31/TX2440_beep.ko #rmmod TX2440_beep TX2440_beep.c /*************************************
PWM的驱动，在TX2440A上做测试 linux内核：2.6.31
*************************************/ #include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <asm/irq.h>
#include <plat/regs-timer.h>
#include <mach/regs-gpio.h>
#include <mach/map.h>
#include <mach/regs-irq.h>
#include <asm/io.h>
#include <mach/hardware.h>
#include <asm/uaccess.h>
#include <asm/system.h> #define DEVICE_NAME "TX2440-Beep"
static int BEEP_MAJOR=0;  /* 主设备号 */ static int TX2440_beep_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
unsigned long temp;
if(cmd <= 0)
{
  temp = __raw_readl(S3C2410_GPBCON); //GPBCON
  temp &= ~3;
  temp |= 1;
  __raw_writel(temp, S3C2410_GPBCON);   temp = __raw_readl(S3C2410_GPBDAT); //GPBDAT
  temp &= ~1;
  __raw_writel(temp, S3C2410_GPBDAT);
}
else
{
  temp = __raw_readl(S3C2410_GPBCON); //GPBCON
  temp &= ~3;
  temp |= 2;
  __raw_writel(temp, S3C2410_GPBCON);   temp = __raw_readl(S3C2410_TCFG0); //TCFG0
  temp &= ~0xff;
  temp |= 15;
  __raw_writel(temp, S3C2410_TCFG0);   temp = __raw_readl(S3C2410_TCFG1); //TCFG1
  temp &= ~0xf;
  temp |= 2;
  __raw_writel(temp, S3C2410_TCFG1);   temp = (50000000/128)/cmd;
  __raw_writel(temp, S3C2410_TCNTB(0));   temp >>= 1;
  __raw_writel(temp, S3C2410_TCMPB(0));   temp = __raw_readl(S3C2410_TCON); //TCON
  temp &= ~0x1f;
  temp |= 0xb;
  __raw_writel(temp, S3C2410_TCON);   temp &= ~2;
  __raw_writel(temp, S3C2410_TCON);
}
return 0;
} static struct file_operations TX2440_beep_fops = {
.owner = THIS_MODULE,
.ioctl = TX2440_beep_ioctl,
}; static struct class *beep_class; static int __init TX2440_beep_init(void)
{
printk("TX2440 BEEP DRIVER MODULE INIT\n"); BEEP_MAJOR = register_chrdev(0, DEVICE_NAME, &TX2440_beep_fops);
if (BEEP_MAJOR < 0) {
   printk(DEVICE_NAME " can't register major number\n");
   return BEEP_MAJOR;
}
printk("register TX2440-Beep Driver OK! Major = %d\n", BEEP_MAJOR); beep_class = class_create(THIS_MODULE, DEVICE_NAME);
if(IS_ERR(beep_class))
{
  printk("Err: failed in TX2440-Beep class. \n");
  return -1;
} device_create(beep_class, NULL, MKDEV(BEEP_MAJOR, 0), NULL, DEVICE_NAME); printk(DEVICE_NAME " initialized\n");
return 0; } static void __exit TX2440_beep_exit(void)
{
unregister_chrdev(BEEP_MAJOR, DEVICE_NAME);
device_destroy(beep_class, MKDEV(BEEP_MAJOR, 0));
class_destroy(beep_class);
} module_init(TX2440_beep_init);
module_exit(TX2440_beep_exit);
MODULE_AUTHOR("laohan");
MODULE_DESCRIPTION("TX2440 Beep Driver");
MODULE_LICENSE("GPL"); 编写测试程序beep.c /*************************************
PWM驱动测试程序，在TX2440A开发板做测试驱动用法：
  设备名称：TX2440-Beep
  测试程序名称：beep
  参数为蜂鸣器的频率
*************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h> int main(int argc, char **argv)
{
int fd;
unsigned long temp =0;
int i; fd = open("/dev/TX2440-Beep", O_RDWR);
if (fd < 0)
{
  perror("open device TX2440-BEEP");
  exit(1);
}
printf("Please enter the times number (0 is stop) :\n"); while(1)
{
  scanf("%d",&temp);
  printf("times = %d \n",temp);
  ioctl(fd, temp, 4);
  if(temp == 0)
  {
   printf("Stop Control Beep!\n");
   break;
  }
}
close(fd);
return 0;
}
arm-linux-gcc beep.c -o beep 把程序下载到开发板上，加上权限chmod 777 beep ./beep