基于linux-2.6.38内核的嵌入式驱动常用的函数调用

基于linux-2.6.38内核的嵌入式驱动常用的函数调用

基于linux-2.6.38内核的嵌入式驱动常用的函数调用：
1.static inline unsigned long copy_from_user(void __user *to,const void
*from, unsigned long n)
{
......
}

作用：用copy_from_user(),用户空间到内核空间传递数据，参数：目的，源，长度/??
小，返回值是n??
举例：copy_from_user(&val,buf,count);

2.static inline int register_chrdev(unsigned int major, const char
*name,const struct file_operations *fops)
{
......
}
作用：注册，即告诉内核将结构体static struct file_operations xxx_fops

举例：major=register_chrdev(0,"first_drv_led",&first_drv_led_fops);

3.static inline void __iomem *ioremap(phys_addr_t offset, unsigned long
size)
{
......
}

举例：gpkcon0 = (volatile unsigned long *)ioremap(0x7F008800, 16);

4.struct class *__class_create(struct module *owner, const char
*name,struct lock_class_key *key)
{