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
  25 #define LP_TRUST_IRQ_  0x0200 /* obsolete */
  26 #define LP_NO_REVERSE  0x0400 /* No reverse mode available. */
  27 #define LP_DATA_AVAIL  0x0800 /* Data is available. */
  28 #define LP_HAVE_PORT_BIT   12 /* (0x1000) Port is claimed. */
  29 #define LP_PORT_BUSY   (1<<13) /* Reading or writing. */
  30
  31 /* timeout for each character.  This is relative to bus cycles -- it
  32  * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
  33  * have extremely slow printing, or if the machine seems to slow down
  34  * a lot when you print.  If you have slow printing, increase this
  35  * number and recompile, and if your system gets bogged down, decrease
  36  * this number.  This can be changed with the tunelp(8) command as well.
  37  */
  38
  39 #define LP_INIT_CHAR 1000
  40
  41 /* The parallel port specs apparently say that there needs to be
  42  * a .5usec wait before and after the strobe.
  43  */
  44
  45 #define LP_INIT_WAIT 1
  46
  47 /* This is the amount of time that the driver waits for the printer to
  48  * catch up when the printer's buffer appears to be filled.  If you
  49  * want to tune this and have a fast printer (i.e. HPIIIP), decrease
  50  * this number, and if you have a slow printer, increase this number.
  51  * This is in hundredths of a second, the default 2 being .05 second.
  52  * Or use the tunelp(8) command, which is especially nice if you want
  53  * change back and forth between character and graphics printing, which
  54  * are wildly different...
  55  */
  56
  57 #define LP_INIT_TIME 2
  58
  59 /* IOCTL numbers */
  60 #define LPCHAR   0x0601  /* corresponds to LP_INIT_CHAR */
  61 #define LPTIME   0x0602  /* corresponds to LP_INIT_TIME */
  62 #define LPABORT  0x0604  /* call with TRUE arg to abort on error,
  63                             FALSE to retry.  Default is retry.  */
  64 #define LPSETIRQ 0x0605  /* call with new IRQ number,
  65                             or 0 for polling (no IRQ) */
  66 #define LPGETIRQ 0x0606  /* get the current IRQ number */
  67 #define LPWAIT   0x0608  /* corresponds to LP_INIT_WAIT */
  68 /* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */
  69 #define LPCAREFUL   0x0609  /* call with TRUE arg to require out-of-paper, off-
  70                             line, and error indicators good on all writes,
  71                             FALSE to ignore them.  Default is ignore. */
  72 #define LPABORTOPEN 0x060a  /* call with TRUE arg to abort open() on error,
  73                             FALSE to ignore error.  Default is ignore.  */
  74 #define LPGETSTATUS 0x060b  /* return LP_S(minor) */
  75 #define LPRESET     0x060c  /* reset printer */
  76 #ifdef LP_STATS
  77 #define LPGETSTATS  0x060d  /* get statistics (struct lp_stats) */
  78 #endif
  79 #define LPGETFLAGS  0x060e  /* get status flags */
  80
  81 /* timeout for printk'ing a timeout, in jiffies (100ths of a second).
  82    This is also used for re-checking error conditions if LP_ABORT is
  83    not set.  This is the default behavior. */
  84
  85 #define LP_TIMEOUT_INTERRUPT    (60 * HZ)
  86 #define LP_TIMEOUT_POLLED       (10 * HZ)
  87
  88 #ifdef __KERNEL__
  89
  90 /* Magic numbers for defining port-device mappings */
  91 #define LP_PARPORT_UNSPEC -4
  92 #define LP_PARPORT_AUTO -3
  93 #define LP_PARPORT_OFF -2
  94 #define LP_PARPORT_NONE -1
  95
  96 #define LP_F(minor)     lp_table[(minor)].flags         /* flags for busy, etc. */
  97 #define LP_CHAR(minor)  lp_table[(minor)].chars         /* busy timeout */
  98 #define LP_TIME(minor)  lp_table[(minor)].time          /* wait time */
  99 #define LP_WAIT(minor)  lp_table[(minor)].wait          /* strobe wait */
 100 #define LP_IRQ(minor)   lp_table[(minor)].dev->port->irq /* interrupt # */
 101                                         /* PARPORT_IRQ_NONE means polled */
 102 #ifdef LP_STATS
 103 #define LP_STAT(minor)  lp_table[(minor)].stats         /* statistics area */
 104 #endif
 105 #define LP_BUFFER_SIZE PAGE_SIZE
 106
 107 #define LP_BASE(x)      lp_table[(x)].dev->port->base
 108
 109 #ifdef LP_STATS
 110 struct lp_stats {
 111         unsigned long chars;
 112         unsigned long sleeps;
 113         unsigned int maxrun;
 114         unsigned int maxwait;
 115         unsigned int meanwait;
 116         unsigned int mdev;
 117 };
 118 #endif
 119
 120 struct lp_struct {
 121         struct pardevice *dev;
 122         unsigned long flags;
 123         unsigned int chars;
 124         unsigned int time;
 125         unsigned int wait;
 126         char *lp_buffer;
 127 #ifdef LP_STATS
 128         unsigned int lastcall;
 129         unsigned int runchars;
 130         struct lp_stats stats;
 131 #endif
 132         wait_queue_head_t waitq;
 133         unsigned int last_error;
 134         struct semaphore port_mutex;
 135         wait_queue_head_t dataq;
 136 };
 137
 138 /*
 139  * The following constants describe the various signals of the printer port
 140  * hardware.  Note that the hardware inverts some signals and that some
 141  * signals are active low.  An example is LP_STROBE, which must be programmed
 142  * with 1 for being active and 0 for being inactive, because the strobe signal
 143  * gets inverted, but it is also active low.
 144  */
 145
 146 /*
 147  * bit defines for 8255 status port
 148  * base + 1
 149  * accessed with LP_S(minor), which gets the byte...
 150  */
 151 #define LP_PBUSY        0x80  /* inverted input, active high */
 152 #define LP_PACK         0x40  /* unchanged input, active low */
 153 #define LP_POUTPA       0x20  /* unchanged input, active high */
 154 #define LP_PSELECD      0x10  /* unchanged input, active high */
 155 #define LP_PERRORP      0x08  /* unchanged input, active low */
 156
 157 /*
 158  * defines for 8255 control port
 159  * base + 2
 160  * accessed with LP_C(minor)
 161  */
 162 #define LP_PINTEN       0x10  /* high to read data in or-ed with data out */
 163 #define LP_PSELECP      0x08  /* inverted output, active low */
 164 #define LP_PINITP       0x04  /* unchanged output, active low */
 165 #define LP_PAUTOLF      0x02  /* inverted output, active low */
 166 #define LP_PSTROBE      0x01  /* short high output on raising edge */
 167
 168 /*
 169  * the value written to ports to test existence. PC-style ports will
 170  * return the value written. AT-style ports will return 0. so why not
 171  * make them the same ?
 172  */
 173 #define LP_DUMMY        0x00
 174
 175 /*
 176  * This is the port delay time, in microseconds.
 177  * It is used only in the lp_init() and lp_reset() routine.
 178  */
 179 #define LP_DELAY        50
 180
 181 /*
 182  * function prototypes
 183  */
 184
 185 extern int lp_init(void);
 186
 187 #endif
 188
 189 #endif