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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
- */
-
- /*
- * 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_OFFL 0x0008
- #define LP_NOPA 0x0010
- #define LP_ERR 0x0020
- #define LP_ABORT 0x0040
-
- /* 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. Since there are wildly
- * different computers running linux, I can't come up with a perfect
- * value, but since it worked well on most printers before without,
- * I'll initialize it to 0.
- */
-
- #define LP_INIT_WAIT 0
-
- /* 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 0x0001 /* corresponds to LP_INIT_CHAR */
- #define LPTIME 0x0002 /* corresponds to LP_INIT_TIME */
- #define LPABORT 0x0004 /* call with TRUE arg to abort on error,
- FALSE to retry. Default is retry. */
- #define LPSETIRQ 0x0005 /* call with new IRQ number,
- or 0 for polling (no IRQ) */
- #define LPGETIRQ 0x0006 /* get the current IRQ number */
- #define LPWAIT 0x0008 /* corresponds to LP_INIT_WAIT */
-
- /* 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)
-
- #define LP_B(minor) lp_table[(minor)].base /* IO address */
- #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */
- #define LP_S(minor) inb_p(LP_B((minor)) + 1) /* status port */
- #define LP_C(minor) (lp_table[(minor)].base + 2) /* control port */
- #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)].irq /* interrupt # */
- /* 0 means polled */
-
- #define LP_BUFFER_SIZE 256
-
- struct lp_struct {
- int base;
- unsigned int irq;
- int flags;
- unsigned int chars;
- unsigned int time;
- unsigned int wait;
- struct wait_queue *lp_wait_q;
- char *lp_buffer;
- };
-
- /* the BIOS manuals say there can be up to 4 lpt devices
- * but I have not seen a board where the 4th address is listed
- * if you have different hardware change the table below
- * please let me know if you have different equipment
- * if you have more than 3 printers, remember to increase LP_NO
- */
- struct lp_struct lp_table[] = {
- { 0x3bc, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
- { 0x378, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
- { 0x278, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
- };
- #define LP_NO 3
-
- /*
- * bit defines for 8255 status port
- * base + 1
- * accessed with LP_S(minor), which gets the byte...
- */
- #define LP_PBUSY 0x80 /* active low */
- #define LP_PACK 0x40 /* active low */
- #define LP_POUTPA 0x20
- #define LP_PSELECD 0x10
- #define LP_PERRORP 0x08 /* active low*/
-
- /*
- * defines for 8255 control port
- * base + 2
- * accessed with LP_C(minor)
- */
- #define LP_PINTEN 0x10
- #define LP_PSELECP 0x08
- #define LP_PINITP 0x04 /* active low */
- #define LP_PAUTOLF 0x02
- #define LP_PSTROBE 0x01
-
- /*
- * 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. Your mileage may vary.
- * It is used only in the lp_init() routine.
- */
- #define LP_DELAY 150000
-
- /*
- * function prototypes
- */
-
- extern long lp_init(long);
-
- #endif
-