xref: /openbmc/linux/include/uapi/linux/lp.h (revision 9a450484)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * usr/include/linux/lp.h c.1991-1992 James Wiegand
4  * many modifications copyright (C) 1992 Michael K. Johnson
5  * Interrupt support added 1993 Nigel Gamble
6  * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti
7  */
8 #ifndef _UAPI_LINUX_LP_H
9 #define _UAPI_LINUX_LP_H
10 
11 #include <linux/types.h>
12 #include <linux/ioctl.h>
13 
14 /*
15  * Per POSIX guidelines, this module reserves the LP and lp prefixes
16  * These are the lp_table[minor].flags flags...
17  */
18 #define LP_EXIST 0x0001
19 #define LP_SELEC 0x0002
20 #define LP_BUSY	 0x0004
21 #define LP_BUSY_BIT_POS 2
22 #define LP_OFFL	 0x0008
23 #define LP_NOPA  0x0010
24 #define LP_ERR   0x0020
25 #define LP_ABORT 0x0040
26 #define LP_CAREFUL 0x0080 /* obsoleted -arca */
27 #define LP_ABORTOPEN 0x0100
28 
29 #define LP_TRUST_IRQ_  0x0200 /* obsolete */
30 #define LP_NO_REVERSE  0x0400 /* No reverse mode available. */
31 #define LP_DATA_AVAIL  0x0800 /* Data is available. */
32 
33 /*
34  * bit defines for 8255 status port
35  * base + 1
36  * accessed with LP_S(minor), which gets the byte...
37  */
38 #define LP_PBUSY	0x80  /* inverted input, active high */
39 #define LP_PACK		0x40  /* unchanged input, active low */
40 #define LP_POUTPA	0x20  /* unchanged input, active high */
41 #define LP_PSELECD	0x10  /* unchanged input, active high */
42 #define LP_PERRORP	0x08  /* unchanged input, active low */
43 
44 /* timeout for each character.  This is relative to bus cycles -- it
45  * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
46  * have extremely slow printing, or if the machine seems to slow down
47  * a lot when you print.  If you have slow printing, increase this
48  * number and recompile, and if your system gets bogged down, decrease
49  * this number.  This can be changed with the tunelp(8) command as well.
50  */
51 
52 #define LP_INIT_CHAR 1000
53 
54 /* The parallel port specs apparently say that there needs to be
55  * a .5usec wait before and after the strobe.
56  */
57 
58 #define LP_INIT_WAIT 1
59 
60 /* This is the amount of time that the driver waits for the printer to
61  * catch up when the printer's buffer appears to be filled.  If you
62  * want to tune this and have a fast printer (i.e. HPIIIP), decrease
63  * this number, and if you have a slow printer, increase this number.
64  * This is in hundredths of a second, the default 2 being .05 second.
65  * Or use the tunelp(8) command, which is especially nice if you want
66  * change back and forth between character and graphics printing, which
67  * are wildly different...
68  */
69 
70 #define LP_INIT_TIME 2
71 
72 /* IOCTL numbers */
73 #define LPCHAR   0x0601  /* corresponds to LP_INIT_CHAR */
74 #define LPTIME   0x0602  /* corresponds to LP_INIT_TIME */
75 #define LPABORT  0x0604  /* call with TRUE arg to abort on error,
76 			    FALSE to retry.  Default is retry.  */
77 #define LPSETIRQ 0x0605  /* call with new IRQ number,
78 			    or 0 for polling (no IRQ) */
79 #define LPGETIRQ 0x0606  /* get the current IRQ number */
80 #define LPWAIT   0x0608  /* corresponds to LP_INIT_WAIT */
81 /* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */
82 #define LPCAREFUL   0x0609  /* call with TRUE arg to require out-of-paper, off-
83 			    line, and error indicators good on all writes,
84 			    FALSE to ignore them.  Default is ignore. */
85 #define LPABORTOPEN 0x060a  /* call with TRUE arg to abort open() on error,
86 			    FALSE to ignore error.  Default is ignore.  */
87 #define LPGETSTATUS 0x060b  /* return LP_S(minor) */
88 #define LPRESET     0x060c  /* reset printer */
89 #ifdef LP_STATS
90 #define LPGETSTATS  0x060d  /* get statistics (struct lp_stats) */
91 #endif
92 #define LPGETFLAGS  0x060e  /* get status flags */
93 #define LPSETTIMEOUT_OLD 0x060f /* set parport timeout */
94 #define LPSETTIMEOUT_NEW \
95 	_IOW(0x6, 0xf, __s64[2]) /* set parport timeout */
96 #if __BITS_PER_LONG == 64
97 #define LPSETTIMEOUT LPSETTIMEOUT_OLD
98 #else
99 #define LPSETTIMEOUT (sizeof(time_t) > sizeof(__kernel_long_t) ? \
100 	LPSETTIMEOUT_NEW : LPSETTIMEOUT_OLD)
101 #endif
102 
103 /* timeout for printk'ing a timeout, in jiffies (100ths of a second).
104    This is also used for re-checking error conditions if LP_ABORT is
105    not set.  This is the default behavior. */
106 
107 #define LP_TIMEOUT_INTERRUPT	(60 * HZ)
108 #define LP_TIMEOUT_POLLED	(10 * HZ)
109 
110 
111 #endif /* _UAPI_LINUX_LP_H */
112