linux/include/linux/lp.h
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   1/*
   2 * usr/include/linux/lp.h c.1991-1992 James Wiegand
   3 * many modifications copyright (C) 1992 Michael K. Johnson
   4 * Interrupt support added 1993 Nigel Gamble
   5 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 
   6 */
   7#ifndef _LINUX_LP_H
   8#define _LINUX_LP_H
   9
  10
  11#include <linux/wait.h>
  12#include <linux/mutex.h>
  13#include <uapi/linux/lp.h>
  14
  15/* Magic numbers for defining port-device mappings */
  16#define LP_PARPORT_UNSPEC -4
  17#define LP_PARPORT_AUTO -3
  18#define LP_PARPORT_OFF -2
  19#define LP_PARPORT_NONE -1
  20
  21#define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
  22#define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
  23#define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
  24#define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
  25#define LP_IRQ(minor)   lp_table[(minor)].dev->port->irq /* interrupt # */
  26                                        /* PARPORT_IRQ_NONE means polled */
  27#ifdef LP_STATS
  28#define LP_STAT(minor)  lp_table[(minor)].stats         /* statistics area */
  29#endif
  30#define LP_BUFFER_SIZE PAGE_SIZE
  31
  32#define LP_BASE(x)      lp_table[(x)].dev->port->base
  33
  34#ifdef LP_STATS
  35struct lp_stats {
  36        unsigned long chars;
  37        unsigned long sleeps;
  38        unsigned int maxrun;
  39        unsigned int maxwait;
  40        unsigned int meanwait;
  41        unsigned int mdev;
  42};
  43#endif
  44
  45struct lp_struct {
  46        struct pardevice *dev;
  47        unsigned long flags;
  48        unsigned int chars;
  49        unsigned int time;
  50        unsigned int wait;
  51        char *lp_buffer;
  52#ifdef LP_STATS
  53        unsigned int lastcall;
  54        unsigned int runchars;
  55        struct lp_stats stats;
  56#endif
  57        wait_queue_head_t waitq;
  58        unsigned int last_error;
  59        struct mutex port_mutex;
  60        wait_queue_head_t dataq;
  61        long timeout;
  62        unsigned int best_mode;
  63        unsigned int current_mode;
  64        unsigned long bits;
  65};
  66
  67/*
  68 * The following constants describe the various signals of the printer port
  69 * hardware.  Note that the hardware inverts some signals and that some
  70 * signals are active low.  An example is LP_STROBE, which must be programmed
  71 * with 1 for being active and 0 for being inactive, because the strobe signal
  72 * gets inverted, but it is also active low.
  73 */
  74
  75
  76/* 
  77 * defines for 8255 control port
  78 * base + 2 
  79 * accessed with LP_C(minor)
  80 */
  81#define LP_PINTEN       0x10  /* high to read data in or-ed with data out */
  82#define LP_PSELECP      0x08  /* inverted output, active low */
  83#define LP_PINITP       0x04  /* unchanged output, active low */
  84#define LP_PAUTOLF      0x02  /* inverted output, active low */
  85#define LP_PSTROBE      0x01  /* short high output on raising edge */
  86
  87/* 
  88 * the value written to ports to test existence. PC-style ports will 
  89 * return the value written. AT-style ports will return 0. so why not
  90 * make them the same ? 
  91 */
  92#define LP_DUMMY        0x00
  93
  94/*
  95 * This is the port delay time, in microseconds.
  96 * It is used only in the lp_init() and lp_reset() routine.
  97 */
  98#define LP_DELAY        50
  99
 100#endif
 101
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