joystick.h

/*#include <linux/sched.h>
   #include <linux/errno.h>
   #include <linux/major.h>
   #include <asm/io.h>
   #include <asm/segment.h>
   #include <asm/system.h>
   #include <linux/module.h> */

#define JS_RETURN sizeof(struct JS_DATA_TYPE)	/*number of bytes returned by js_read */
#define JS_TRUE 1
#define JS_FALSE 0
#define JS_PORT 0x201		/*io port for joystick operations */
#define JS_DEF_TIMEOUT 0x1300	/*default timeout value for js_read() */
#define JS_DEF_CORR	0	/*default correction factor */
#define JS_DEF_TIMELIMIT 10L	/*default data valid time =10 jiffies == 100ms */
#define JS_X_0	0x01		/*bit mask for x-axis js0 */
#define JS_Y_0	0x02		/*bit mask for y-axis js0 */
#define JS_X_1	0x04		/*bit mask for x-axis js1 */
#define JS_Y_1	0x08		/*bit mask for y-axis js1 */
#define JS_MAX 2		/*Max number of joysticks */
#define PIT_MODE 0x43		/*io port for timer 0 */
#define PIT_COUNTER_0 0x40	/*io port for timer 0 */
#define JS_SET_CAL 0x01		/*ioctl cmd to set joystick correction factor */
#define JS_GET_CAL 0x02		/*ioctl cmd to get joystick correction factor */
#define JS_SET_TIMEOUT 0x03	/*ioctl cmd to set maximum number of iterations
				   to wait for a timeout */
#define JS_GET_TIMEOUT		0x04	/*as above, to get */
#define JS_SET_TIMELIMIT	0x05	/*set data retention time */
#define JS_GET_TIMELIMIT	0x06	/*get data retention time */
#define JS_GET_ALL		0x07	/*get the whole JS_DATA[minor] struct */
#define JS_SET_ALL		0x08	/*set the whole JS_DATA[minor] struct
					   except JS_BUSY! */

/*This union is used for the ioctl to set the scaling factor and to return
   the current values for a joystick. 'buttons' is ignored on the ioctl call */

struct JS_DATA_TYPE
  {
    int             buttons;
    int             x;
    int             y;
  };

/* This struct is used for misc data about the joystick */
struct JS_DATA_SAVE_TYPE
  {
    int             JS_TIMEOUT;	/*timeout */
    int             BUSY;	/*joystick is in use */
    long            JS_EXPIRETIME;	/*Time when stick after which stick must be re-read */
    long            JS_TIMELIMIT;	/*Max time before data is invalid */
    struct JS_DATA_TYPE JS_SAVE;	/*last read data */
    struct JS_DATA_TYPE JS_CORR;	/*correction factor */
  };

#define LATCH (1193180L/HZ)	/*initial timer 0 value */
#define DELTA_TIME(X,Y) ((X)-(Y)+(((X)>=(Y))?0:LATCH))
#define CURRENT_JIFFIES (jiffies)

#define JOYSTICK_MAJOR		15