标题 | 阅读 | 评论 | 转发 | 发布日期 | |
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嵌入式系统终端分析 | 874 | 0 | 0 | 2010-06-06 | |
嵌入式系统终端分析 | 642 | 0 | 0 | 2010-06-06 | |
linux UART串口驱动开发文档 | 756 | 0 | 1 | 2010-06-05 | |
linux设备模型之uart驱动架构分析 | 1244 | 0 | 0 | 2010-06-05 |
chen_chuang2012-10-11 16:33
高手,有本书上写cdev初始化和注册是这样写的
static void VirtualDisk_setup_cdev(struct VirtualDisk *dev, int minor)
{
int err;
devno = MDDEV(VirtualDisk_major, minor);
cdev_init(&dev->cdev, &VirtualDisk_fops);
dev->cdev.owner = THIS_MOUDULE;
dev->cdev.ops = &VirtualDisk_fops;
err = cdev_add(&dev->cdev, debno, 1);
if (err)
printk(KERN_NOTICE "Error in cdev_add()\n");
}
而cdev_init里
void cdev_init(struct cdev *cdev, const struct file_operations *fops)
{
memset(cdev, 0, sizeof *cdev);
INIT_LIST_HEAD(&cdev->list);
kobject_init(&cdev->kobj, &ktype_cdev_default);
cdev->ops = fops;
}
已经有cdev->ops = fops了
那上面的代码cdev_init之后又有dev->cdev.ops ,这两个函数不一样吗,自我感觉有点多次一举,,,不太明白