include/linux/lp.h

/* */
   1 #ifndef _LINUX_LP_H
   2 #define _LINUX_LP_H
   3 
   4 /*
   5 $Header: /usr/src/linux/include/linux/lp.h,v 1.2 1992/01/21 23:59:24 james_r_wiegand Exp james_r_wiegand $
   6 */
   7 
   8 #include <linux/errno.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 
  12 #include <asm/io.h>
  13 #include <asm/segment.h>
  14 
  15 /*
  16  * usr/include/linux/lp.h c.1991-1992 James Wiegand
  17  */
  18 
  19 /*
  20  * caveat: my machine only has 1 printer @ lpt2 so lpt1 & lpt3 are 
  21  * implemented but UNTESTED
  22  */
  23 
  24 /*
  25  * Per POSIX guidelines, this module reserves the LP and lp prefixes
  26  */
  27 #define LP_EXIST 0x0001
  28 #define LP_SELEC 0x0002
  29 #define LP_BUSY  0x0004
  30 #define LP_OFFL  0x0008
  31 #define LP_NOPA  0x0010
  32 #define LP_ERR   0x0020
  33 
  34 #define LP_TIMEOUT 200000
  35 
  36 #define LP_B(minor)     lp_table[(minor)].base
  37 #define LP_F(minor)     lp_table[(minor)].flags
  38 #define LP_S(minor)     inb(LP_B((minor)) + 1)
  39 
  40 /* 
  41 since we are dealing with a horribly slow device
  42 I don't see the need for a queue
  43 */
  44 struct lp_struct {
  45         int base;
  46         int flags;
  47 };
  48 
  49 /* 
  50  * the BIOS manuals say there can be up to 4 lpt devices
  51  * but I have not seen a board where the 4th address is listed
  52  * if you have different hardware change the table below 
  53  * please let me know if you have different equipment
  54  * if you have more than 3 printers, remember to increase LP_NO
  55  */
  56 struct lp_struct lp_table[] = {
  57         { 0x3bc, 0, },
  58         { 0x378, 0, },
  59         { 0x278, 0, }
  60 }; 
  61 
  62 #define LP_NO 3
  63 
  64 /* 
  65  * bit defines for 8255 status port
  66  * base + 1
  67  */
  68 #define LP_PBUSY        0x80 /* active low */
  69 #define LP_PACK         0x40 /* active low */
  70 #define LP_POUTPA       0x20
  71 #define LP_PSELECD      0x10
  72 #define LP_PERRORP      0x08 /*å active low*/
  73 #define LP_PIRQ         0x04 /* active low */
  74 
  75 /* 
  76  * defines for 8255 control port
  77  * base + 2 
  78  */
  79 #define LP_PIRQEN       0x10
  80 #define LP_PSELECP      0x08
  81 #define LP_PINITP       0x04  /* active low */
  82 #define LP_PAUTOLF      0x02
  83 #define LP_PSTROBE      0x01
  84 
  85 /* 
  86  * the value written to ports to test existence. PC-style ports will 
  87  * return the value written. AT-style ports will return 0. so why not
  88  * make them the same ? 
  89  */
  90 #define LP_DUMMY        0x00
  91 
  92 /*
  93  * this is the port delay time. your mileage may vary
  94  */
  95 #define LP_DELAY        150000
  96 
  97 /*
  98  * function prototypes
  99  */
 100 
 101 extern long lp_init(long);
 102 
 103 #endif
/* */
root/include/linux/lp.h

INCLUDED FROM
