linux/include/linux/lp.h
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   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 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 
   9 */
  10
  11/*
  12 * Per POSIX guidelines, this module reserves the LP and lp prefixes
  13 * These are the lp_table[minor].flags flags...
  14 */
  15#define LP_EXIST 0x0001
  16#define LP_SELEC 0x0002
  17#define LP_BUSY  0x0004
  18#define LP_BUSY_BIT_POS 2
  19#define LP_OFFL  0x0008
  20#define LP_NOPA  0x0010
  21#define LP_ERR   0x0020
  22#define LP_ABORT 0x0040
  23#define LP_CAREFUL 0x0080 /* obsoleted -arca */
  24#define LP_ABORTOPEN 0x0100
  25
  26#define LP_TRUST_IRQ_  0x0200 /* obsolete */
  27#define LP_NO_REVERSE  0x0400 /* No reverse mode available. */
  28#define LP_DATA_AVAIL  0x0800 /* Data is available. */
  29
  30/* 
  31 * bit defines for 8255 status port
  32 * base + 1
  33 * accessed with LP_S(minor), which gets the byte...
  34 */
  35#define LP_PBUSY        0x80  /* inverted input, active high */
  36#define LP_PACK         0x40  /* unchanged input, active low */
  37#define LP_POUTPA       0x20  /* unchanged input, active high */
  38#define LP_PSELECD      0x10  /* unchanged input, active high */
  39#define LP_PERRORP      0x08  /* unchanged input, active low */
  40
  41/* timeout for each character.  This is relative to bus cycles -- it
  42 * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
  43 * have extremely slow printing, or if the machine seems to slow down
  44 * a lot when you print.  If you have slow printing, increase this
  45 * number and recompile, and if your system gets bogged down, decrease
  46 * this number.  This can be changed with the tunelp(8) command as well.
  47 */
  48
  49#define LP_INIT_CHAR 1000
  50
  51/* The parallel port specs apparently say that there needs to be
  52 * a .5usec wait before and after the strobe.
  53 */
  54
  55#define LP_INIT_WAIT 1
  56
  57/* This is the amount of time that the driver waits for the printer to
  58 * catch up when the printer's buffer appears to be filled.  If you
  59 * want to tune this and have a fast printer (i.e. HPIIIP), decrease
  60 * this number, and if you have a slow printer, increase this number.
  61 * This is in hundredths of a second, the default 2 being .05 second.
  62 * Or use the tunelp(8) command, which is especially nice if you want
  63 * change back and forth between character and graphics printing, which
  64 * are wildly different...
  65 */
  66
  67#define LP_INIT_TIME 2
  68
  69/* IOCTL numbers */
  70#define LPCHAR   0x0601  /* corresponds to LP_INIT_CHAR */
  71#define LPTIME   0x0602  /* corresponds to LP_INIT_TIME */
  72#define LPABORT  0x0604  /* call with TRUE arg to abort on error,
  73                            FALSE to retry.  Default is retry.  */
  74#define LPSETIRQ 0x0605  /* call with new IRQ number,
  75                            or 0 for polling (no IRQ) */
  76#define LPGETIRQ 0x0606  /* get the current IRQ number */
  77#define LPWAIT   0x0608  /* corresponds to LP_INIT_WAIT */
  78/* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */
  79#define LPCAREFUL   0x0609  /* call with TRUE arg to require out-of-paper, off-
  80                            line, and error indicators good on all writes,
  81                            FALSE to ignore them.  Default is ignore. */
  82#define LPABORTOPEN 0x060a  /* call with TRUE arg to abort open() on error,
  83                            FALSE to ignore error.  Default is ignore.  */
  84#define LPGETSTATUS 0x060b  /* return LP_S(minor) */
  85#define LPRESET     0x060c  /* reset printer */
  86#ifdef LP_STATS
  87#define LPGETSTATS  0x060d  /* get statistics (struct lp_stats) */
  88#endif
  89#define LPGETFLAGS  0x060e  /* get status flags */
  90#define LPSETTIMEOUT 0x060f /* set parport timeout */
  91
  92/* timeout for printk'ing a timeout, in jiffies (100ths of a second).
  93   This is also used for re-checking error conditions if LP_ABORT is
  94   not set.  This is the default behavior. */
  95
  96#define LP_TIMEOUT_INTERRUPT    (60 * HZ)
  97#define LP_TIMEOUT_POLLED       (10 * HZ)
  98
  99#ifdef __KERNEL__
 100
 101#include <linux/wait.h>
 102#include <linux/mutex.h>
 103
 104/* Magic numbers for defining port-device mappings */
 105#define LP_PARPORT_UNSPEC -4
 106#define LP_PARPORT_AUTO -3
 107#define LP_PARPORT_OFF -2
 108#define LP_PARPORT_NONE -1
 109
 110#define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
 111#define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
 112#define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
 113#define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
 114#define LP_IRQ(minor)   lp_table[(minor)].dev->port->irq /* interrupt # */
 115                                        /* PARPORT_IRQ_NONE means polled */
 116#ifdef LP_STATS
 117#define LP_STAT(minor)  lp_table[(minor)].stats         /* statistics area */
 118#endif
 119#define LP_BUFFER_SIZE PAGE_SIZE
 120
 121#define LP_BASE(x)      lp_table[(x)].dev->port->base
 122
 123#ifdef LP_STATS
 124struct lp_stats {
 125        unsigned long chars;
 126        unsigned long sleeps;
 127        unsigned int maxrun;
 128        unsigned int maxwait;
 129        unsigned int meanwait;
 130        unsigned int mdev;
 131};
 132#endif
 133
 134struct lp_struct {
 135        struct pardevice *dev;
 136        unsigned long flags;
 137        unsigned int chars;
 138        unsigned int time;
 139        unsigned int wait;
 140        char *lp_buffer;
 141#ifdef LP_STATS
 142        unsigned int lastcall;
 143        unsigned int runchars;
 144        struct lp_stats stats;
 145#endif
 146        wait_queue_head_t waitq;
 147        unsigned int last_error;
 148        struct mutex port_mutex;
 149        wait_queue_head_t dataq;
 150        long timeout;
 151        unsigned int best_mode;
 152        unsigned int current_mode;
 153        unsigned long bits;
 154};
 155
 156/*
 157 * The following constants describe the various signals of the printer port
 158 * hardware.  Note that the hardware inverts some signals and that some
 159 * signals are active low.  An example is LP_STROBE, which must be programmed
 160 * with 1 for being active and 0 for being inactive, because the strobe signal
 161 * gets inverted, but it is also active low.
 162 */
 163
 164
 165/* 
 166 * defines for 8255 control port
 167 * base + 2 
 168 * accessed with LP_C(minor)
 169 */
 170#define LP_PINTEN       0x10  /* high to read data in or-ed with data out */
 171#define LP_PSELECP      0x08  /* inverted output, active low */
 172#define LP_PINITP       0x04  /* unchanged output, active low */
 173#define LP_PAUTOLF      0x02  /* inverted output, active low */
 174#define LP_PSTROBE      0x01  /* short high output on raising edge */
 175
 176/* 
 177 * the value written to ports to test existence. PC-style ports will 
 178 * return the value written. AT-style ports will return 0. so why not
 179 * make them the same ? 
 180 */
 181#define LP_DUMMY        0x00
 182
 183/*
 184 * This is the port delay time, in microseconds.
 185 * It is used only in the lp_init() and lp_reset() routine.
 186 */
 187#define LP_DELAY        50
 188
 189#endif
 190
 191#endif
 192
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