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  */
   8 
   9 /*
  10  * Per POSIX guidelines, this module reserves the LP and lp prefixes
  11  * These are the lp_table[minor].flags flags...
  12  */
  13 #define LP_EXIST 0x0001
  14 #define LP_SELEC 0x0002
  15 #define LP_BUSY  0x0004
  16 #define LP_OFFL  0x0008
  17 #define LP_NOPA  0x0010
  18 #define LP_ERR   0x0020
  19 #define LP_ABORT 0x0040
  20 
  21 /* timeout for each character.  This is relative to bus cycles -- it
  22  * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
  23  * have extremely slow printing, or if the machine seems to slow down
  24  * a lot when you print.  If you have slow printing, increase this
  25  * number and recompile, and if your system gets bogged down, decrease
  26  * this number.  This can be changed with the tunelp(8) command as well.
  27  */
  28 
  29 #define LP_INIT_CHAR 1000
  30 
  31 /* The parallel port specs apparently say that there needs to be
  32  * a .5usec wait before and after the strobe.  Since there are wildly
  33  * different computers running linux, I can't come up with a perfect
  34  * value, but since it worked well on most printers before without,
  35  * I'll initialize it to 0.
  36  */
  37 
  38 #define LP_INIT_WAIT 0
  39 
  40 /* This is the amount of time that the driver waits for the printer to
  41  * catch up when the printer's buffer appears to be filled.  If you
  42  * want to tune this and have a fast printer (i.e. HPIIIP), decrease
  43  * this number, and if you have a slow printer, increase this number.
  44  * This is in hundredths of a second, the default 2 being .05 second.
  45  * Or use the tunelp(8) command, which is especially nice if you want
  46  * change back and forth between character and graphics printing, which
  47  * are wildly different...
  48  */
  49 
  50 #define LP_INIT_TIME 2
  51 
  52 /* IOCTL numbers */
  53 #define LPCHAR   0x0001  /* corresponds to LP_INIT_CHAR */
  54 #define LPTIME   0x0002  /* corresponds to LP_INIT_TIME */
  55 #define LPABORT  0x0004  /* call with TRUE arg to abort on error,
  56                             FALSE to retry.  Default is retry.  */
  57 #define LPWAIT   0x0008  /* corresponds to LP_INIT_WAIT */
  58 
  59 /* timeout for printk'ing a timeout, in jiffies (100ths of a second).
  60    This is also used for re-checking error conditions if LP_ABORT is
  61    not set.  This is the default behavior. */
  62 
  63 #define LP_TIMEOUT 1000
  64 
  65 #define LP_B(minor)     lp_table[(minor)].base          /* IO address */
  66 #define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
  67 #define LP_S(minor)     inb_p(LP_B((minor)) + 1)        /* status port */
  68 #define LP_C(minor)     (lp_table[(minor)].base + 2)    /* control port */
  69 #define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
  70 #define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
  71 #define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
  72 
  73 /* 
  74 since we are dealing with a horribly slow device
  75 I don't see the need for a queue
  76 */
  77 struct lp_struct {
  78         int base;
  79         int flags;
  80         unsigned int chars;
  81         unsigned int time;
  82         unsigned int wait;
  83 };
  84 
  85 /* the BIOS manuals say there can be up to 4 lpt devices
  86  * but I have not seen a board where the 4th address is listed
  87  * if you have different hardware change the table below 
  88  * please let me know if you have different equipment
  89  * if you have more than 3 printers, remember to increase LP_NO
  90  */
  91 struct lp_struct lp_table[] = {
  92         { 0x3bc, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, },
  93         { 0x378, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, },
  94         { 0x278, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, },
  95 }; 
  96 #define LP_NO 3
  97 
  98 /* 
  99  * bit defines for 8255 status port
 100  * base + 1
 101  * accessed with LP_S(minor), which gets the byte...
 102  */
 103 #define LP_PBUSY        0x80 /* active low */
 104 #define LP_PACK         0x40 /* active low */
 105 #define LP_POUTPA       0x20
 106 #define LP_PSELECD      0x10
 107 #define LP_PERRORP      0x08 /* active low*/
 108 
 109 /* 
 110  * defines for 8255 control port
 111  * base + 2 
 112  * accessed with LP_C(minor)
 113  */
 114 #define LP_PSELECP      0x08
 115 #define LP_PINITP       0x04  /* active low */
 116 #define LP_PAUTOLF      0x02
 117 #define LP_PSTROBE      0x01
 118 
 119 /* 
 120  * the value written to ports to test existence. PC-style ports will 
 121  * return the value written. AT-style ports will return 0. so why not
 122  * make them the same ? 
 123  */
 124 #define LP_DUMMY        0x00
 125 
 126 /*
 127  * This is the port delay time.  Your mileage may vary.
 128  * It is used only in the lp_init() routine.
 129  */
 130 #define LP_DELAY        150000
 131 
 132 /*
 133  * function prototypes
 134  */
 135 
 136 extern long lp_init(long);
 137 
 138 #endif
/* */
root/include/linux/lp.h

INCLUDED FROM
