/* * scull.h -- definitions for the char module * * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet * Copyright (C) 2001 O'Reilly & Associates * * The source code in this file can be freely used, adapted, * and redistributed in source or binary form, so long as an * acknowledgment appears in derived source files.  The citation * should list that the code comes from the book "Linux Device * Drivers" by Alessandro Rubini and Jonathan Corbet, published * by O'Reilly & Associates.   No warranty is attached; * we cannot take responsibility for errors or fitness for use. * * $Id: scull.h,v 1.15 2004/11/04 17:51:18 rubini Exp $ */#ifndef _SCULL_H_#define _SCULL_H_#include <linux/ioctl.h> /* needed for the _IOW etc stuff used later */struct scull_kfifo {//	unsigned int access_key;  /* used by sculluid and scullpriv */	struct semaphore sem;     /* mutual exclusion semaphore     */	struct cdev cdev;	  /* Char device structure		*/	spinlock_t lock;	struct kfifo *tekkamankfifo;        wait_queue_head_t inq, outq;       /* read and write queues */	};#define  BUFSIZE		64/* * Split minors in two parts */#define TYPE(minor)	(((minor) >> 4) & 0xf)	/* high nibble */#define NUM(minor)	((minor) & 0xf)		/* low  nibble *//* * The different configurable parameters */extern int scull_major;     /* main.c *//* * Prototypes for shared functions */ssize_t scull_read(struct file *filp, char __user *buf, size_t count,                   loff_t *f_pos);ssize_t scull_write(struct file *filp, const char __user *buf, size_t count,                    loff_t *f_pos);/* * Ioctl definitions *//* Use 'k' as magic number */#define SCULL_KFIFO_MAGIC  'k'/* Please use a different 8-bit number in your code */#define SCULL_KFIFO_SIZE  _IO(SCULL_KFIFO_MAGIC,   0)#define SCULL_KFIFO_RESET _IO(SCULL_KFIFO_MAGIC,   1)/* ... more to come */#define SCULL_KFIFO_MAXNR 1#endif /* _SCULL_H_ */