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 _LINUX_LP_H
8#define _LINUX_LP_H
9
10
11#include <linux/wait.h>
12#include <linux/mutex.h>
13#include <uapi/linux/lp.h>
14
15/* Magic numbers for defining port-device mappings */
16#define LP_PARPORT_UNSPEC -4
17#define LP_PARPORT_AUTO -3
18#define LP_PARPORT_OFF -2
19#define LP_PARPORT_NONE -1
20
21#define LP_F(minor)	lp_table[(minor)].flags		/* flags for busy, etc. */
22#define LP_CHAR(minor)	lp_table[(minor)].chars		/* busy timeout */
23#define LP_TIME(minor)	lp_table[(minor)].time		/* wait time */
24#define LP_WAIT(minor)	lp_table[(minor)].wait		/* strobe wait */
25#define LP_IRQ(minor)	lp_table[(minor)].dev->port->irq /* interrupt # */
26					/* PARPORT_IRQ_NONE means polled */
27#ifdef LP_STATS
28#define LP_STAT(minor)	lp_table[(minor)].stats		/* statistics area */
29#endif
30#define LP_BUFFER_SIZE PAGE_SIZE
31
32#define LP_BASE(x)	lp_table[(x)].dev->port->base
33
34#ifdef LP_STATS
35struct lp_stats {
36	unsigned long chars;
37	unsigned long sleeps;
38	unsigned int maxrun;
39	unsigned int maxwait;
40	unsigned int meanwait;
41	unsigned int mdev;
42};
43#endif
44
45struct lp_struct {
46	struct pardevice *dev;
47	unsigned long flags;
48	unsigned int chars;
49	unsigned int time;
50	unsigned int wait;
51	char *lp_buffer;
52#ifdef LP_STATS
53	unsigned int lastcall;
54	unsigned int runchars;
55	struct lp_stats stats;
56#endif
57	wait_queue_head_t waitq;
58	unsigned int last_error;
59	struct mutex port_mutex;
60	wait_queue_head_t dataq;
61	long timeout;
62	unsigned int best_mode;
63	unsigned int current_mode;
64	unsigned long bits;
65};
66
67/*
68 * The following constants describe the various signals of the printer port
69 * hardware.  Note that the hardware inverts some signals and that some
70 * signals are active low.  An example is LP_STROBE, which must be programmed
71 * with 1 for being active and 0 for being inactive, because the strobe signal
72 * gets inverted, but it is also active low.
73 */
74
75
76/*
77 * defines for 8255 control port
78 * base + 2
79 * accessed with LP_C(minor)
80 */
81#define LP_PINTEN	0x10  /* high to read data in or-ed with data out */
82#define LP_PSELECP	0x08  /* inverted output, active low */
83#define LP_PINITP	0x04  /* unchanged output, active low */
84#define LP_PAUTOLF	0x02  /* inverted output, active low */
85#define LP_PSTROBE	0x01  /* short high output on raising edge */
86
87/*
88 * the value written to ports to test existence. PC-style ports will
89 * return the value written. AT-style ports will return 0. so why not
90 * make them the same ?
91 */
92#define LP_DUMMY	0x00
93
94/*
95 * This is the port delay time, in microseconds.
96 * It is used only in the lp_init() and lp_reset() routine.
97 */
98#define LP_DELAY 	50
99
100#endif
101