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#ifndef _HELLOMAIN_H_
#define _HELLOMAIN_H_
#include <linux/cdev.h>
#include <linux/list.h>
/*
* Macros to aid with debugging
*/
#ifdef HELLO_DEBUG
#define PDEBUG(fmt, args...) printk( KERN_DEBUG "[hello] " fmt, ##args)
#define PRDEBUG(fmt, args...) if (printk_ratelimit()) \
printk( KERN_DEBUG "[hello] " fmt, ##args)
#else
/* not debugging: nothing */
#define PDEBUG(fmt, args...)
#define PRDEBUG(fmt, args...)
#endif
#ifndef HELLO_MAJOR
#define HELLO_MAJOR 0 /* let kernel choose, unless user really defined it */
#endif
/*
* Allow user to define size of node using a #define, or passing -D compiler
* flag
*/
#ifndef HELLO_NODE_CHUNK_SIZE
#define HELLO_NODE_CHUNK_SIZE 256
#endif
extern int hello_major;
extern int hello_minor;
extern char *magicstr;
/* node to be used with Linux api for circular linked lists */
struct hello_ll
{
char *chunk;
struct list_head list;
};
struct hello_dev {
dev_t devnum;
struct semaphore sem;
struct cdev cdev; /* char device */
/* for r/w operations */
struct hello_ll *mylist;
int chunk_sz;
size_t ll_size;
};
/* function prototypes */
int hello_debugfs(void);
/*
* Ioctl definitions
*/
/* Use 'x' as magic number */
#define HELLO_IOCTL_BASE 'x'
#define HELLO_IO(nr) _IO(HELLO_IOCTL_BASE, nr)
#define HELLO_IOR(nr, type) _IOR(HELLO_IOCTL_BASE, nr, type)
#define HELLO_IOW(nr, type) _IOW(HELLO_IOCTL_BASE, nr, type)
#define HELLO_IOWR(nr, type) _IOWR(HELLO_IOCTL_BASE, nr, type)
#define HELLO_IOCTL_RESET HELLO_IO(0x00)
#define HELLO_IOCTL_SCHUNK HELLO_IOW(0x01, int) /* write to kernel */
#define HELLO_IOCTL_TCHUNK HELLO_IO(0x02)
#define HELLO_IOCTL_GCHUNK HELLO_IOR(0x03, int) /* write to user */
#define HELLO_IOCTL_QCHUNK HELLO_IO(0x04)
#define HELLO_IOCTL_MAXNR 4
#endif
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