入门文章：教你学会编写Linux设备驱动之三1

static int asdf_open (struct inode *inode, struct file *filp);

static int asdf_release (struct inode *inode, struct file *filp);

static ssize_t asdf_read (struct file *filp, char *buf, size_t count,loff_t *f_pos);

static ssize_t asdf_write (struct file *filp, const char *buf, size_t count,loff_t *f_pos);

static loff_t asdf_lseek (struct file * file, loff_t offset, int orig);


/* 申请主设备号时用的结构, 在linux/

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