include/linux/lp.h

/* */
   1 #ifndef _LINUX_LP_H
   2 #define _LINUX_LP_H
   3 
   4 /*
   5  * usr/include/linux/lp.h c.1991-1992 James Wiegand
   6  * many modifications copyright (C) 1992 Michael K. Johnson
   7  * Interrupt support added 1993 Nigel Gamble
   8  */
   9 
  10 /*
  11  * Per POSIX guidelines, this module reserves the LP and lp prefixes
  12  * These are the lp_table[minor].flags flags...
  13  */
  14 #define LP_EXIST 0x0001
  15 #define LP_SELEC 0x0002
  16 #define LP_BUSY  0x0004
  17 #define LP_OFFL  0x0008
  18 #define LP_NOPA  0x0010
  19 #define LP_ERR   0x0020
  20 #define LP_ABORT 0x0040
  21 
  22 /* timeout for each character.  This is relative to bus cycles -- it
  23  * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
  24  * have extremely slow printing, or if the machine seems to slow down
  25  * a lot when you print.  If you have slow printing, increase this
  26  * number and recompile, and if your system gets bogged down, decrease
  27  * this number.  This can be changed with the tunelp(8) command as well.
  28  */
  29 
  30 #define LP_INIT_CHAR 1000
  31 
  32 /* The parallel port specs apparently say that there needs to be
  33  * a .5usec wait before and after the strobe.  Since there are wildly
  34  * different computers running linux, I can't come up with a perfect
  35  * value, but since it worked well on most printers before without,
  36  * I'll initialize it to 0.
  37  */
  38 
  39 #define LP_INIT_WAIT 0
  40 
  41 /* This is the amount of time that the driver waits for the printer to
  42  * catch up when the printer's buffer appears to be filled.  If you
  43  * want to tune this and have a fast printer (i.e. HPIIIP), decrease
  44  * this number, and if you have a slow printer, increase this number.
  45  * This is in hundredths of a second, the default 2 being .05 second.
  46  * Or use the tunelp(8) command, which is especially nice if you want
  47  * change back and forth between character and graphics printing, which
  48  * are wildly different...
  49  */
  50 
  51 #define LP_INIT_TIME 2
  52 
  53 /* IOCTL numbers */
  54 #define LPCHAR   0x0001  /* corresponds to LP_INIT_CHAR */
  55 #define LPTIME   0x0002  /* corresponds to LP_INIT_TIME */
  56 #define LPABORT  0x0004  /* call with TRUE arg to abort on error,
  57                             FALSE to retry.  Default is retry.  */
  58 #define LPSETIRQ 0x0005  /* call with new IRQ number,
  59                             or 0 for polling (no IRQ) */
  60 #define LPGETIRQ 0x0006  /* get the current IRQ number */
  61 #define LPWAIT   0x0008  /* corresponds to LP_INIT_WAIT */
  62 
  63 /* timeout for printk'ing a timeout, in jiffies (100ths of a second).
  64    This is also used for re-checking error conditions if LP_ABORT is
  65    not set.  This is the default behavior. */
  66 
  67 #define LP_TIMEOUT_INTERRUPT    (60 * HZ)
  68 #define LP_TIMEOUT_POLLED       (10 * HZ)
  69 
  70 #define LP_B(minor)     lp_table[(minor)].base          /* IO address */
  71 #define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
  72 #define LP_S(minor)     inb_p(LP_B((minor)) + 1)        /* status port */
  73 #define LP_C(minor)     (lp_table[(minor)].base + 2)    /* control port */
  74 #define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
  75 #define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
  76 #define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
  77 #define LP_IRQ(minor)   lp_table[(minor)].irq           /* interrupt # */
  78                                                         /* 0 means polled */
  79 
  80 #define LP_BUFFER_SIZE 256
  81 
  82 struct lp_struct {
  83         int base;
  84         unsigned int irq;
  85         int flags;
  86         unsigned int chars;
  87         unsigned int time;
  88         unsigned int wait;
  89         struct wait_queue *lp_wait_q;
  90         char *lp_buffer;
  91 };
  92 
  93 /* the BIOS manuals say there can be up to 4 lpt devices
  94  * but I have not seen a board where the 4th address is listed
  95  * if you have different hardware change the table below 
  96  * please let me know if you have different equipment
  97  * if you have more than 3 printers, remember to increase LP_NO
  98  */
  99 struct lp_struct lp_table[] = {
 100         { 0x3bc, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
 101         { 0x378, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
 102         { 0x278, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
 103 }; 
 104 #define LP_NO 3
 105 
 106 /* 
 107  * bit defines for 8255 status port
 108  * base + 1
 109  * accessed with LP_S(minor), which gets the byte...
 110  */
 111 #define LP_PBUSY        0x80 /* active low */
 112 #define LP_PACK         0x40 /* active low */
 113 #define LP_POUTPA       0x20
 114 #define LP_PSELECD      0x10
 115 #define LP_PERRORP      0x08 /* active low*/
 116 
 117 /* 
 118  * defines for 8255 control port
 119  * base + 2 
 120  * accessed with LP_C(minor)
 121  */
 122 #define LP_PINTEN       0x10
 123 #define LP_PSELECP      0x08
 124 #define LP_PINITP       0x04  /* active low */
 125 #define LP_PAUTOLF      0x02
 126 #define LP_PSTROBE      0x01
 127 
 128 /* 
 129  * the value written to ports to test existence. PC-style ports will 
 130  * return the value written. AT-style ports will return 0. so why not
 131  * make them the same ? 
 132  */
 133 #define LP_DUMMY        0x00
 134 
 135 /*
 136  * This is the port delay time.  Your mileage may vary.
 137  * It is used only in the lp_init() routine.
 138  */
 139 #define LP_DELAY        150000
 140 
 141 /*
 142  * function prototypes
 143  */
 144 
 145 extern long lp_init(long);
 146 
 147 #endif
/* */
root/include/linux/lp.h

INCLUDED FROM
