分类： 嵌入式
2011-09-28 21:40:55
/************************************************
LED的驱动，在TX2440A开发板上做测试
维护记录： 2009-10-18 V1.0
linux内核：2.6.31
硬件接法：
LED1 --> GPF0
LED2 --> GPF1
LED3 --> GPF2
LED4 --> GPF3
低电平点亮
驱动用法：
设备名称：TX2440-led
点亮一个灯：LED_ON
熄灭一个灯：LED_OFF
点亮所有灯：ALL_LED_ON
熄灭所有灯：ALL_LED_OFF
说明：
内核源码里已经有LED的驱动，将它们注释掉
在arch/arm/plat-s3c24xx/common-smdk.c中
将GPF0-GPF3设为输出，全部输出低电平
*************************************************/
#include
#include
#include
#include
#include
#include
//#include
#include
//#include
#include
#include
#include
#define DEVICE_NAME "TX2440-led" /* 设备名称 */
static int LED_Major = 0; /* 主设备号 */
#define LED_OFF 0
#define LED_ON 1
#define ALL_LED_OFF 3
#define ALL_LED_ON 4
/* 用来指定LED所用的GPIO引脚 */
static unsigned long led_table [] =
{
S3C2410_GPF(0),
S3C2410_GPF(1),
S3C2410_GPF(2),
S3C2410_GPF(3),
};
static int TX2440_led_open(struct inode *inode, struct file *file)
{
// MOD_INC_USE_COUNT;
printk("TX2440-LED Driver Open Called!\n");
return 0;
}
static int TX2440_led_release(struct inode *inode, struct file *file)
{
// MOD_DEC_USE_COUNT;
printk("TX2440-LED Driver Release Called!\n");
return 0;
}
static int TX2440_led_ioctl( struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
int i;
if (arg > 4)
{
return -EINVAL;
}
switch(cmd)
{
case LED_ON: //set the pin
s3c2410_gpio_setpin(led_table[arg], 0);
break;
case LED_OFF: //clr the pin
s3c2410_gpio_setpin(led_table[arg], 1);
break;
case ALL_LED_ON: //set all pin
for (i = 0; i < 4; i++)
s3c2410_gpio_setpin(led_table[i], 0);
break;
case ALL_LED_OFF: //clr all pin
for (i = 0; i < 4; i++)
s3c2410_gpio_setpin(led_table[i], 1);
break;
default:
return -EINVAL;
}
}
static struct file_operations TX2440_led_fops =
{
.owner = THIS_MODULE,
.open = TX2440_led_open,
.release = TX2440_led_release,
.ioctl = TX2440_led_ioctl,
};
static struct class *led_class;
static int __init TX2440_led_init(void)
{
printk("TX2440 LED DRIVER MODULE INIT\n");
LED_Major = register_chrdev(0, DEVICE_NAME, &TX2440_led_fops);
if (LED_Major < 0)
{
printk(DEVICE_NAME " can't register major number\n");
return LED_Major;
}
printk("register TX2440-LED Driver OK! Major = %d\n", LED_Major);
led_class = class_create(THIS_MODULE, DEVICE_NAME);
if(IS_ERR(led_class))
{
printk("Err: failed in TX2440-LED class. \n");
return -1;
}
device_create(led_class, NULL, MKDEV(LED_Major, 0), NULL, DEVICE_NAME);
printk(DEVICE_NAME " initialized\n");
return 0;
}
static void __exit TX2440_led_exit(void)
{
printk("TX2440 LED DRIVER MODULE EXIT\n");
unregister_chrdev(LED_Major, DEVICE_NAME);
device_destroy(led_class, MKDEV(LED_Major, 0));
class_destroy(led_class);
}
module_init(TX2440_led_init);
module_exit(TX2440_led_exit);
MODULE_AUTHOR("www.txmcu.com");
MODULE_DESCRIPTION("TX2440 LED Driver");
MODULE_LICENSE("GPL");
源代码：
TX2440_led.rar
测试代码： led.rar
