ReactOS  0.4.14-dev-297-g23e575c
parallel.h
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1 #pragma once
2 
3 /*
4  * usr/include/linux/lp.h c.1991-1992 James Wiegand
5  * many modifications copyright (C) 1992 Michael K. Johnson
6  * Interrupt support added 1993 Nigel Gamble
7  */
8 
9 /*
10  * Per POSIX guidelines, this module reserves the LP and lp prefixes
11  * These are the lp_table[minor].flags flags...
12  */
13 #define LP_EXIST 0x0001
14 #define LP_SELEC 0x0002
15 #define LP_BUSY 0x0004
16 #define LP_OFFL 0x0008
17 #define LP_NOPA 0x0010
18 #define LP_ERR 0x0020
19 #define LP_ABORT 0x0040
20 #define LP_CAREFUL 0x0080
21 #define LP_ABORTOPEN 0x0100
22 
23 /* timeout for each character. This is relative to bus cycles -- it
24  * is the count in a busy loop. THIS IS THE VALUE TO CHANGE if you
25  * have extremely slow printing, or if the machine seems to slow down
26  * a lot when you print. If you have slow printing, increase this
27  * number and recompile, and if your system gets bogged down, decrease
28  * this number. This can be changed with the tunelp(8) command as well.
29  */
30 
31 #define LP_INIT_CHAR 1000
32 
33 /* The parallel port specs apparently say that there needs to be
34  * a .5usec wait before and after the strobe. Since there are wildly
35  * different computers running linux, I can't come up with a perfect
36  * value, but since it worked well on most printers before without,
37  * I'll initialize it to 0.
38  */
39 
40 #define LP_INIT_WAIT 0
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 #define LPCAREFUL 0x0609 /* call with TRUE arg to require out-of-paper, off-
64  line, and error indicators good on all writes,
65  FALSE to ignore them. Default is ignore. */
66 #define LPABORTOPEN 0x060a /* call with TRUE arg to abort open() on error,
67  FALSE to ignore error. Default is ignore. */
68 #define LPGETSTATUS 0x060b /* return LP_S(minor) */
69 #define LPRESET 0x060c /* reset printer */
70 
71 /* timeout for printing a timeout, in jiffies (100ths of a second).
72  This is also used for re-checking error conditions if LP_ABORT is
73  not set. This is the default behavior. */
74 
75 #define LP_TIMEOUT_INTERRUPT (60 * HZ)
76 #define LP_TIMEOUT_POLLED (10 * HZ)
77 
78 #if 0
79 #define LP_B(minor) lp_table[(minor)].base /* IO address */
80 #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */
81 #define LP_S(minor) inb_p(LP_B((minor)) + 1) /* status port */
82 #define LP_C(minor) (lp_table[(minor)].base + 2) /* control port */
83 #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */
84 #define LP_TIME(minor) lp_table[(minor)].time /* wait time */
85 #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */
86 #define LP_IRQ(minor) lp_table[(minor)].irq /* interrupt # */
87  /* 0 means polled */
88 #endif
89 
90 #define LP_BUFFER_SIZE 256
91 
92 
93 /*
94  * The following constants describe the various signals of the printer port
95  * hardware. Note that the hardware inverts some signals and that some
96  * signals are active low. An example is LP_STROBE, which must be programmed
97  * with 1 for being active and 0 for being inactive, because the strobe signal
98  * gets inverted, but it is also active low.
99  */
100 
101 /*
102  * bit defines for 8255 status port
103  * base + 1
104  * accessed with LP_S(minor), which gets the byte...
105  */
106 #define LP_PBUSY 0x80 /* inverted input, active high */
107 #define LP_PACK 0x40 /* unchanged input, active low */
108 #define LP_POUTPA 0x20 /* unchanged input, active high */
109 #define LP_PSELECD 0x10 /* unchanged input, active high */
110 #define LP_PERRORP 0x08 /* unchanged input, active low */
111 
112 /*
113  * defines for 8255 control port
114  * base + 2
115  * accessed with LP_C(minor)
116  */
117 #define LP_PINTEN 0x10
118 #define LP_PSELECP 0x08 /* inverted output, active low */
119 #define LP_PINITP 0x04 /* unchanged output, active low */
120 #define LP_PAUTOLF 0x02 /* inverted output, active low */
121 #define LP_PSTROBE 0x01 /* inverted output, active low */
122 
123 /*
124  * the value written to ports to test existence. PC-style ports will
125  * return the value written. AT-style ports will return 0. so why not
126  * make them the same ?
127  */
128 #define LP_DUMMY 0x00
129 
130 /*
131  * This is the port delay time. Your mileage may vary.
132  * It is used only in the lp_init() routine.
133  */
134 #define LP_DELAY 150000