include/linux/lp.h

   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
  35 struct 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
  45 struct 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