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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
David Howells607ca462012-10-13 10:46:48 +01007#ifndef _LINUX_LP_H
8#define _LINUX_LP_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#include <linux/wait.h>
Matthias Kaehlcke0a5dcb52008-02-06 01:36:25 -080012#include <linux/mutex.h>
David Howells607ca462012-10-13 10:46:48 +010013#include <uapi/linux/lp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
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;
Matthias Kaehlcke0a5dcb52008-02-06 01:36:25 -080059 struct mutex port_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 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