/* * scullc.h -- definitions for the scullc char module * *********/#include <linux/ioctl.h>/* version dependencies have been confined to a separate file */#include "sysdep.h"/* * Macros to help debugging */#undef PDEBUG             /* undef it, just in case */#ifdef SCULLC_DEBUG#  ifdef __KERNEL__     /* This one if debugging is on, and kernel space */#    define PDEBUG(fmt, args...) printk( KERN_DEBUG "scullc: " fmt, ## args)#  else     /* This one for user space */#    define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)#  endif#else#  define PDEBUG(fmt, args...) /* not debugging: nothing */#endif#undef PDEBUGG#define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */#define SCULLC_MAJOR 0   /* dynamic major by default */#define SCULLC_DEVS 4    /* scullc0 through scullc3 *//* * The bare device is a variable-length region of memory. * Use a linked list of indirect blocks. * * "ScullC_Dev->data" points to an array of pointers, each * pointer refers to a memory page. * * The array (quantum-set) is SCULLC_QSET long. */#define SCULLC_QUANTUM  4000 /* use a quantum size like scull */#define SCULLC_QSET     500typedef struct ScullC_Dev {   void **data;   struct ScullC_Dev *next;  /* next listitem */   int vmas;                 /* active mappings */   int quantum;              /* the current allocation size */   int qset;                 /* the current array size */   size_t size;              /* 32-bit will suffice */   struct semaphore sem;     /* Mutual exclusion */} ScullC_Dev;extern ScullC_Dev *scullc_devices;extern struct file_operations scullc_fops;/* * The different configurable parameters */extern int scullc_major;     /* main.c */extern int scullc_devs;extern int scullc_order;extern int scullc_qset;/* * Prototypes for shared functions */int scullc_trim(ScullC_Dev *dev);ScullC_Dev *scullc_follow(ScullC_Dev *dev, int n);#ifdef SCULLC_DEBUG#  define SCULLC_USE_PROC#endif#ifndef min#  define min(a,b) ((a)<(b) ? (a) : (b))#endif/* * Ioctl definitions *//* Use 'K' as magic number */#define SCULLC_IOC_MAGIC  'K'#define SCULLC_IOCRESET    _IO(SCULLC_IOC_MAGIC, 0)/* * S means "Set" through a ptr, * T means "Tell" directly * G means "Get" (to a pointed var) * Q means "Query", response is on the return value * X means "eXchange": G and S atomically * H means "sHift": T and Q atomically */#define SCULLC_IOCSQUANTUM _IOW(SCULLC_IOC_MAGIC,  1, scullc_quantum)#define SCULLC_IOCTQUANTUM _IO(SCULLC_IOC_MAGIC,   2)#define SCULLC_IOCGQUANTUM _IOR(SCULLC_IOC_MAGIC,  3, scullc_quantum)#define SCULLC_IOCQQUANTUM _IO(SCULLC_IOC_MAGIC,   4)#define SCULLC_IOCXQUANTUM _IOWR(SCULLC_IOC_MAGIC, 5, scullc_quantum)#define SCULLC_IOCHQUANTUM _IO(SCULLC_IOC_MAGIC,   6)#define SCULLC_IOCSQSET    _IOW(SCULLC_IOC_MAGIC,  7, scullc_qset)#define SCULLC_IOCTQSET    _IO(SCULLC_IOC_MAGIC,   8)#define SCULLC_IOCGQSET    _IOR(SCULLC_IOC_MAGIC,  9, scullc_qset)#define SCULLC_IOCQQSET    _IO(SCULLC_IOC_MAGIC,  10)#define SCULLC_IOCXQSET    _IOWR(SCULLC_IOC_MAGIC,11, scullc_qset)#define SCULLC_IOCHQSET    _IO(SCULLC_IOC_MAGIC,  12)#define SCULLC_IOCHARDRESET _IO(SCULLC_IOC_MAGIC, 13) /* debugging tool */#define SCULLC_IOC_MAXNR 13