bma020的例子
static long bma020_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
。。。
}
static const struct file_operations bma020_fops = {
.owner = THIS_MODULE,
.read = bma020_read,
.write = bma020_write,
.open = bma020_open,
.release = bma020_close,
.unlocked_ioctl = bma020_ioctl,
};
/* May 4th 2009 modified*
* add miscdevices for bma
*/
static struct miscdevice bma_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "bma",
.fops = &bma020_fops,
};
上面三个东西，第三个结构体指向第二个结构体，第二个结构体包含的成员unlocked_ioctl是个函数指针，指向第一个函数，ioctl函数。获取数据时，须打开上面第三个结构体定义的这个miscdevice设备，设备名就是其成员name：bma