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#ifndef _LINUX_LP_H

#define _LINUX_LP_H

/*

 * usr/include/linux/lp.h c.1991-1992 James Wiegand

 * many modifications copyright (C) 1992 Michael K. Johnson

 * Interrupt support added 1993 Nigel Gamble

 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti

 */

/*

 * Per POSIX guidelines, this module reserves the LP and lp prefixes

 * These are the lp_table[minor].flags flags...

 */

#define LP_EXIST 0x0001

#define LP_SELEC 0x0002

#define LP_BUSY  0x0004

#define LP_BUSY_BIT_POS 2

#define LP_OFFL  0x0008

#define LP_NOPA  0x0010

#define LP_ERR   0x0020

#define LP_ABORT 0x0040

#define LP_CAREFUL 0x0080 /* obsoleted -arca */

#define LP_ABORTOPEN 0x0100

#define LP_TRUST_IRQ_  0x0200 /* obsolete */

#define LP_NO_REVERSE  0x0400 /* No reverse mode available. */

#define LP_DATA_AVAIL  0x0800 /* Data is available. */

/*

 * bit defines for 8255 status port

 * base + 1

 * accessed with LP_S(minor), which gets the byte...

 */

#define LP_PBUSY        0x80  /* inverted input, active high */

#define LP_PACK         0x40  /* unchanged input, active low */

#define LP_POUTPA       0x20  /* unchanged input, active high */

#define LP_PSELECD      0x10  /* unchanged input, active high */

#define LP_PERRORP      0x08  /* unchanged input, active low */

/* timeout for each character.  This is relative to bus cycles -- it

 * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you

 * have extremely slow printing, or if the machine seems to slow down

 * a lot when you print.  If you have slow printing, increase this

 * number and recompile, and if your system gets bogged down, decrease

 * this number.  This can be changed with the tunelp(8) command as well.

 */

#define LP_INIT_CHAR 1000

/* The parallel port specs apparently say that there needs to be

 * a .5usec wait before and after the strobe.

 */

#define LP_INIT_WAIT 1

/* This is the amount of time that the driver waits for the printer to

 * catch up when the printer's buffer appears to be filled.  If you

 * want to tune this and have a fast printer (i.e. HPIIIP), decrease

 * this number, and if you have a slow printer, increase this number.

 * This is in hundredths of a second, the default 2 being .05 second.

 * Or use the tunelp(8) command, which is especially nice if you want

 * change back and forth between character and graphics printing, which

 * are wildly different...

 */

#define LP_INIT_TIME 2

/* IOCTL numbers */

#define LPCHAR   0x0601  /* corresponds to LP_INIT_CHAR */

#define LPTIME   0x0602  /* corresponds to LP_INIT_TIME */

#define LPABORT  0x0604  /* call with TRUE arg to abort on error,

                            FALSE to retry.  Default is retry.  */

#define LPSETIRQ 0x0605  /* call with new IRQ number,

                            or 0 for polling (no IRQ) */

#define LPGETIRQ 0x0606  /* get the current IRQ number */

#define LPWAIT   0x0608  /* corresponds to LP_INIT_WAIT */

/* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */

#define LPCAREFUL   0x0609  /* call with TRUE arg to require out-of-paper, off-

                            line, and error indicators good on all writes,

                            FALSE to ignore them.  Default is ignore. */

#define LPABORTOPEN 0x060a  /* call with TRUE arg to abort open() on error,

                            FALSE to ignore error.  Default is ignore.  */

#define LPGETSTATUS 0x060b  /* return LP_S(minor) */

#define LPRESET     0x060c  /* reset printer */

#ifdef LP_STATS

#define LPGETSTATS  0x060d  /* get statistics (struct lp_stats) */

#endif

#define LPGETFLAGS  0x060e  /* get status flags */

#define LPSETTIMEOUT 0x060f /* set parport timeout */

/* timeout for printk'ing a timeout, in jiffies (100ths of a second).

   This is also used for re-checking error conditions if LP_ABORT is

   not set.  This is the default behavior. */

#define LP_TIMEOUT_INTERRUPT    (60 * HZ)

#define LP_TIMEOUT_POLLED       (10 * HZ)

#ifdef __KERNEL__

/* Magic numbers for defining port-device mappings */

#define LP_PARPORT_UNSPEC -4

#define LP_PARPORT_AUTO -3

#define LP_PARPORT_OFF -2

#define LP_PARPORT_NONE -1

#define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */

#define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */

#define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */

#define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */

#define LP_IRQ(minor)   lp_table[(minor)].dev->port->irq /* interrupt # */

                                        /* PARPORT_IRQ_NONE means polled */

#ifdef LP_STATS

#define LP_STAT(minor)  lp_table[(minor)].stats         /* statistics area */

#endif

#define LP_BUFFER_SIZE PAGE_SIZE

#define LP_BASE(x)      lp_table[(x)].dev->port->base

#ifdef LP_STATS

struct lp_stats {

        unsigned long chars;

        unsigned long sleeps;

        unsigned int maxrun;

        unsigned int maxwait;

        unsigned int meanwait;

        unsigned int mdev;

};

#endif

struct lp_struct {

        struct pardevice *dev;

        unsigned long flags;

        unsigned int chars;

        unsigned int time;

        unsigned int wait;

        char *lp_buffer;

#ifdef LP_STATS

        unsigned int lastcall;

        unsigned int runchars;

        struct lp_stats stats;

#endif

        wait_queue_head_t waitq;

        unsigned int last_error;

        struct semaphore port_mutex;

        wait_queue_head_t dataq;

        long timeout;

        unsigned int best_mode;

        unsigned int current_mode;

        unsigned long bits;

};

/*

 * The following constants describe the various signals of the printer port

 * hardware.  Note that the hardware inverts some signals and that some

 * signals are active low.  An example is LP_STROBE, which must be programmed

 * with 1 for being active and 0 for being inactive, because the strobe signal

 * gets inverted, but it is also active low.

 */

/*

 * defines for 8255 control port

 * base + 2

 * accessed with LP_C(minor)

 */

#define LP_PINTEN       0x10  /* high to read data in or-ed with data out */

#define LP_PSELECP      0x08  /* inverted output, active low */

#define LP_PINITP       0x04  /* unchanged output, active low */

#define LP_PAUTOLF      0x02  /* inverted output, active low */

#define LP_PSTROBE      0x01  /* short high output on raising edge */

/*

 * the value written to ports to test existence. PC-style ports will

 * return the value written. AT-style ports will return 0. so why not

 * make them the same ?

 */

#define LP_DUMMY        0x00

/*

 * This is the port delay time, in microseconds.

 * It is used only in the lp_init() and lp_reset() routine.

 */

#define LP_DELAY        50

/*

 * function prototypes

 */

extern int lp_init(void);

#endif

#endif