include/linux/lp.h

   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 <asm/semaphore.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
 124 struct 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
 134 struct 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 semaphore 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