gec210LED驱动

GEC210 有四个led灯，查看原理图发现控制led的gpio为 gpj2；所以我只要配置gpj2就可以达到控制led的效果

led字符设备中实现的函数有，led_open(),led_close(),led_release(),led_ioctl();这些函数直接赋值给struct file——operations 结构中对应的成员变量，并且注册struct file_operations结构，当使用者打开设备的时候，调用led_open()函数，关闭设备的时候，调用led_close(),函数，操作led状态，直接传参数给led_ioctl();

file_operations 结构：

static struct file_operations GEC210_led_fops ={     .owner   =   THIS_MODULE,     .open    =   GEC210_led_open,      .release =   GEC210_led_release,.ioctl   =   GEC210_led_ioctl,.write   =   GEC210_led_write,.read    =   GEC210_led_read,};

led_open()函数

static int GEC210_led_open(struct inode *inode, struct file *file){/* 初始化LED引脚*/unsigned  int val;val=readl(rGPJ2CON);val&=~(0xffff<<0);writel(val,rGPJ2CON);val=readl(rGPJ2DAT);val|=(1111<<0);writel(val,rGPJ2DAT);}

完整源码 http://download.csdn.net/detail/u012090772/6552379