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