spull.h

LINUX设备驱动程序第二版配套源码 LINUX设备驱动程序第二版配套源码 Alessandro rubini&Jonathan corbet著 中国电力出版社 魏永明 骆刚 姜君译 69元

/*
 * spull.h -- definitions for the char module
 *
 *********/

#include <linux/ioctl.h>

/* version dependencies have been confined to a separate file */

#define VERSION_CODE(vers,rel,seq) ( ((vers)<<16) | ((rel)<<8) | (seq) )
#include "sysdep.h"

/*
 * Macros to help debugging
 */

#undef PDEBUG             /* undef it, just in case */
#ifdef SPULL_DEBUG
#  ifdef __KERNEL__
     /* This one if debugging is on, and kernel space */
#    define PDEBUG(fmt, args...) printk( KERN_DEBUG "spull: " 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 SPULL_MAJOR 0       /* dynamic major by default */
#define SPULL_DEVS 2        /* two disks */
#define SPULL_RAHEAD 2      /* two sectors */
#define SPULL_SIZE 2048     /* two megs each */

/*
 * The spull device is removable: if it is left closed for more than
 * half a minute, it is removed. Thus use a usage count and a
 * kernel timer
 */

typedef struct Spull_Dev {
   int size;
   int usage;
   struct timer_list timer;
   u8 *data;
}              Spull_Dev;