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  */
   9
  10 /*
  11  * Per POSIX guidelines, this module reserves the LP and lp prefixes
  12  * These are the lp_table[minor].flags flags...
  13  */
  14 #define LP_EXIST 0x0001
  15 #define LP_SELEC 0x0002
  16 #define LP_BUSY  0x0004
  17 #define LP_BUSY_BIT_POS 2
  18 #define LP_OFFL  0x0008
  19 #define LP_NOPA  0x0010
  20 #define LP_ERR   0x0020
  21 #define LP_ABORT 0x0040
  22 #define LP_CAREFUL 0x0080 /* obsoleted -arca */
  23 #define LP_ABORTOPEN 0x0100
  24 #define LP_TRUST_IRQ 0x0200
  25
  26 /* timeout for each character.  This is relative to bus cycles -- it
  27  * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
  28  * have extremely slow printing, or if the machine seems to slow down
  29  * a lot when you print.  If you have slow printing, increase this
  30  * number and recompile, and if your system gets bogged down, decrease
  31  * this number.  This can be changed with the tunelp(8) command as well.
  32  */
  33
  34 #define LP_INIT_CHAR 1000
  35
  36 /* The parallel port specs apparently say that there needs to be
  37  * a .5usec wait before and after the strobe.
  38  */
  39
  40 #define LP_INIT_WAIT 1
  41
  42 /* This is the amount of time that the driver waits for the printer to
  43  * catch up when the printer's buffer appears to be filled.  If you
  44  * want to tune this and have a fast printer (i.e. HPIIIP), decrease
  45  * this number, and if you have a slow printer, increase this number.
  46  * This is in hundredths of a second, the default 2 being .05 second.
  47  * Or use the tunelp(8) command, which is especially nice if you want
  48  * change back and forth between character and graphics printing, which
  49  * are wildly different...
  50  */
  51
  52 #define LP_INIT_TIME 2
  53
  54 /* IOCTL numbers */
  55 #define LPCHAR   0x0601  /* corresponds to LP_INIT_CHAR */
  56 #define LPTIME   0x0602  /* corresponds to LP_INIT_TIME */
  57 #define LPABORT  0x0604  /* call with TRUE arg to abort on error,
  58                             FALSE to retry.  Default is retry.  */
  59 #define LPSETIRQ 0x0605  /* call with new IRQ number,
  60                             or 0 for polling (no IRQ) */
  61 #define LPGETIRQ 0x0606  /* get the current IRQ number */
  62 #define LPWAIT   0x0608  /* corresponds to LP_INIT_WAIT */
  63 /* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */
  64 #define LPCAREFUL   0x0609  /* call with TRUE arg to require out-of-paper, off-
  65                             line, and error indicators good on all writes,
  66                             FALSE to ignore them.  Default is ignore. */
  67 #define LPABORTOPEN 0x060a  /* call with TRUE arg to abort open() on error,
  68                             FALSE to ignore error.  Default is ignore.  */
  69 #define LPGETSTATUS 0x060b  /* return LP_S(minor) */
  70 #define LPRESET     0x060c  /* reset printer */
  71 #ifdef LP_STATS
  72 #define LPGETSTATS  0x060d  /* get statistics (struct lp_stats) */
  73 #endif
  74 #define LPGETFLAGS  0x060e  /* get status flags */
  75 #define LPTRUSTIRQ  0x060f  /* set/unset the LP_TRUST_IRQ flag */
  76
  77 /* timeout for printk'ing a timeout, in jiffies (100ths of a second).
  78    This is also used for re-checking error conditions if LP_ABORT is
  79    not set.  This is the default behavior. */
  80
  81 #define LP_TIMEOUT_INTERRUPT    (60 * HZ)
  82 #define LP_TIMEOUT_POLLED       (10 * HZ)
  83
  84 #ifdef __KERNEL__
  85
  86 /* Magic numbers for defining port-device mappings */
  87 #define LP_PARPORT_UNSPEC -4
  88 #define LP_PARPORT_AUTO -3
  89 #define LP_PARPORT_OFF -2
  90 #define LP_PARPORT_NONE -1
  91
  92 #define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
  93 #define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
  94 #define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
  95 #define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
  96 #define LP_IRQ(minor)   lp_table[(minor)].dev->port->irq /* interrupt # */
  97                                         /* PARPORT_IRQ_NONE means polled */
  98 #ifdef LP_STATS
  99 #define LP_STAT(minor)  lp_table[(minor)].stats         /* statistics area */
 100 #endif
 101 #define LP_BUFFER_SIZE 256
 102
 103 #define LP_BASE(x)      lp_table[(x)].dev->port->base
 104
 105 #ifdef LP_STATS
 106 struct lp_stats {
 107         unsigned long chars;
 108         unsigned long sleeps;
 109         unsigned int maxrun;
 110         unsigned int maxwait;
 111         unsigned int meanwait;
 112         unsigned int mdev;
 113 };
 114 #endif
 115
 116 struct lp_struct {
 117         struct pardevice *dev;
 118         unsigned long flags;
 119         unsigned int chars;
 120         unsigned int time;
 121         unsigned int wait;
 122         char *lp_buffer;
 123 #ifdef LP_STATS
 124         unsigned int lastcall;
 125         unsigned int runchars;
 126         struct lp_stats stats;
 127 #endif
 128         wait_queue_head_t wait_q;
 129         unsigned int last_error;
 130         volatile unsigned int irq_detected:1;
 131         volatile unsigned int irq_missed:1;
 132 };
 133
 134 /*
 135  * The following constants describe the various signals of the printer port
 136  * hardware.  Note that the hardware inverts some signals and that some
 137  * signals are active low.  An example is LP_STROBE, which must be programmed
 138  * with 1 for being active and 0 for being inactive, because the strobe signal
 139  * gets inverted, but it is also active low.
 140  */
 141
 142 /*
 143  * bit defines for 8255 status port
 144  * base + 1
 145  * accessed with LP_S(minor), which gets the byte...
 146  */
 147 #define LP_PBUSY        0x80  /* inverted input, active high */
 148 #define LP_PACK         0x40  /* unchanged input, active low */
 149 #define LP_POUTPA       0x20  /* unchanged input, active high */
 150 #define LP_PSELECD      0x10  /* unchanged input, active high */
 151 #define LP_PERRORP      0x08  /* unchanged input, active low */
 152
 153 /*
 154  * defines for 8255 control port
 155  * base + 2
 156  * accessed with LP_C(minor)
 157  */
 158 #define LP_PINTEN       0x10  /* high to read data in or-ed with data out */
 159 #define LP_PSELECP      0x08  /* inverted output, active low */
 160 #define LP_PINITP       0x04  /* unchanged output, active low */
 161 #define LP_PAUTOLF      0x02  /* inverted output, active low */
 162 #define LP_PSTROBE      0x01  /* short high output on raising edge */
 163
 164 /*
 165  * the value written to ports to test existence. PC-style ports will
 166  * return the value written. AT-style ports will return 0. so why not
 167  * make them the same ?
 168  */
 169 #define LP_DUMMY        0x00
 170
 171 /*
 172  * This is the port delay time, in microseconds.
 173  * It is used only in the lp_init() and lp_reset() routine.
 174  */
 175 #define LP_DELAY        50
 176
 177 #define LP_POLLED(minor) (lp_table[(minor)].dev->port->irq == PARPORT_IRQ_NONE)
 178 #define LP_PREEMPTED(minor) (lp_table[(minor)].dev->port->waithead != NULL)
 179
 180 /*
 181  * function prototypes
 182  */
 183
 184 extern int lp_init(void);
 185
 186 #endif
 187
 188 #endif