include/linux/lp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * usr/include/linux/lp.h c.1991-1992 James Wiegand
   4  * many modifications copyright (C) 1992 Michael K. Johnson
   5  * Interrupt support added 1993 Nigel Gamble
   6  * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti
   7  */
   8 #ifndef _LINUX_LP_H
   9 #define _LINUX_LP_H
  10
  11
  12 #include <linux/wait.h>
  13 #include <linux/mutex.h>
  14 #include <uapi/linux/lp.h>
  15
  16 /* Magic numbers for defining port-device mappings */
  17 #define LP_PARPORT_UNSPEC -4
  18 #define LP_PARPORT_AUTO -3
  19 #define LP_PARPORT_OFF -2
  20 #define LP_PARPORT_NONE -1
  21
  22 #define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
  23 #define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
  24 #define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
  25 #define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
  26 #define LP_IRQ(minor)   lp_table[(minor)].dev->port->irq /* interrupt # */
  27                                         /* PARPORT_IRQ_NONE means polled */
  28 #ifdef LP_STATS
  29 #define LP_STAT(minor)  lp_table[(minor)].stats         /* statistics area */
  30 #endif
  31 #define LP_BUFFER_SIZE PAGE_SIZE
  32
  33 #define LP_BASE(x)      lp_table[(x)].dev->port->base
  34
  35 #ifdef LP_STATS
  36 struct lp_stats {
  37         unsigned long chars;
  38         unsigned long sleeps;
  39         unsigned int maxrun;
  40         unsigned int maxwait;
  41         unsigned int meanwait;
  42         unsigned int mdev;
  43 };
  44 #endif
  45
  46 struct lp_struct {
  47         struct pardevice *dev;
  48         unsigned long flags;
  49         unsigned int chars;
  50         unsigned int time;
  51         unsigned int wait;
  52         char *lp_buffer;
  53 #ifdef LP_STATS
  54         unsigned int lastcall;
  55         unsigned int runchars;
  56         struct lp_stats stats;
  57 #endif
  58         wait_queue_head_t waitq;
  59         unsigned int last_error;
  60         struct mutex port_mutex;
  61         wait_queue_head_t dataq;
  62         long timeout;
  63         unsigned int best_mode;
  64         unsigned int current_mode;
  65         unsigned long bits;
  66 };
  67
  68 /*
  69  * The following constants describe the various signals of the printer port
  70  * hardware.  Note that the hardware inverts some signals and that some
  71  * signals are active low.  An example is LP_STROBE, which must be programmed
  72  * with 1 for being active and 0 for being inactive, because the strobe signal
  73  * gets inverted, but it is also active low.
  74  */
  75
  76
  77 /*
  78  * defines for 8255 control port
  79  * base + 2
  80  * accessed with LP_C(minor)
  81  */
  82 #define LP_PINTEN       0x10  /* high to read data in or-ed with data out */
  83 #define LP_PSELECP      0x08  /* inverted output, active low */
  84 #define LP_PINITP       0x04  /* unchanged output, active low */
  85 #define LP_PAUTOLF      0x02  /* inverted output, active low */
  86 #define LP_PSTROBE      0x01  /* short high output on raising edge */
  87
  88 /*
  89  * the value written to ports to test existence. PC-style ports will
  90  * return the value written. AT-style ports will return 0. so why not
  91  * make them the same ?
  92  */
  93 #define LP_DUMMY        0x00
  94
  95 /*
  96  * This is the port delay time, in microseconds.
  97  * It is used only in the lp_init() and lp_reset() routine.
  98  */
  99 #define LP_DELAY        50
 100
 101 #endif