/* -*- C -*- * scullc.h -- definitions for the scullc 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. */#include <linux/ioctl.h>#include <linux/cdev.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     500struct 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 */	struct cdev cdev;};extern struct 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(struct scullc_dev *dev);struct scullc_dev *scullc_follow(struct scullc_dev *dev, int n);#ifdef SCULLC_DEBUG#  define SCULLC_USE_PROC#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, int)#define SCULLC_IOCTQUANTUM _IO(SCULLC_IOC_MAGIC,   2)#define SCULLC_IOCGQUANTUM _IOR(SCULLC_IOC_MAGIC,  3, int)#define SCULLC_IOCQQUANTUM _IO(SCULLC_IOC_MAGIC,   4)#define SCULLC_IOCXQUANTUM _IOWR(SCULLC_IOC_MAGIC, 5, int)#define SCULLC_IOCHQUANTUM _IO(SCULLC_IOC_MAGIC,   6)#define SCULLC_IOCSQSET    _IOW(SCULLC_IOC_MAGIC,  7, int)#define SCULLC_IOCTQSET    _IO(SCULLC_IOC_MAGIC,   8)#define SCULLC_IOCGQSET    _IOR(SCULLC_IOC_MAGIC,  9, int)#define SCULLC_IOCQQSET    _IO(SCULLC_IOC_MAGIC,  10)#define SCULLC_IOCXQSET    _IOWR(SCULLC_IOC_MAGIC,11, int)#define SCULLC_IOCHQSET    _IO(SCULLC_IOC_MAGIC,  12)#define SCULLC_IOC_MAXNR 12