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      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 _UAPI_LINUX_LP_H
      8 #define _UAPI_LINUX_LP_H
      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 
    100 #endif /* _UAPI_LINUX_LP_H */
    101