1 /* SPDX-License-Identifier: GPL-2.0 */
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 _LINUX_LP_H
9 #define _LINUX_LP_H
10
11
12 #include <linux/wait.h>
13 #include <linux/mutex.h>
14 #include <uapi/linux/lp.h>
15
16 /* Magic numbers for defining port-device mappings */
17 #define LP_PARPORT_UNSPEC -4
18 #define LP_PARPORT_AUTO -3
19 #define LP_PARPORT_OFF -2
20 #define LP_PARPORT_NONE -1
21
22 #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */
23 #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */
24 #define LP_TIME(minor) lp_table[(minor)].time /* wait time */
25 #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */
26 #define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */
27 /* PARPORT_IRQ_NONE means polled */
28 #ifdef LP_STATS
29 #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */
30 #endif
31 #define LP_BUFFER_SIZE PAGE_SIZE
32
33 #define LP_BASE(x) lp_table[(x)].dev->port->base
34
35 #ifdef LP_STATS
36 struct lp_stats {
37 unsigned long chars;
38 unsigned long sleeps;
39 unsigned int maxrun;
40 unsigned int maxwait;
41 unsigned int meanwait;
42 unsigned int mdev;
43 };
44 #endif
45
46 struct lp_struct {
47 struct pardevice *dev;
48 unsigned long flags;
49 unsigned int chars;
50 unsigned int time;
51 unsigned int wait;
52 char *lp_buffer;
53 #ifdef LP_STATS
54 unsigned int lastcall;
55 unsigned int runchars;
56 struct lp_stats stats;
57 #endif
58 wait_queue_head_t waitq;
59 unsigned int last_error;
60 struct mutex port_mutex;
61 wait_queue_head_t dataq;
62 long timeout;
63 unsigned int best_mode;
64 unsigned int current_mode;
65 unsigned long bits;
66 };
67
68 /*
69 * The following constants describe the various signals of the printer port
70 * hardware. Note that the hardware inverts some signals and that some
71 * signals are active low. An example is LP_STROBE, which must be programmed
72 * with 1 for being active and 0 for being inactive, because the strobe signal
73 * gets inverted, but it is also active low.
74 */
75
76
77 /*
78 * defines for 8255 control port
79 * base + 2
80 * accessed with LP_C(minor)
81 */
82 #define LP_PINTEN 0x10 /* high to read data in or-ed with data out */
83 #define LP_PSELECP 0x08 /* inverted output, active low */
84 #define LP_PINITP 0x04 /* unchanged output, active low */
85 #define LP_PAUTOLF 0x02 /* inverted output, active low */
86 #define LP_PSTROBE 0x01 /* short high output on raising edge */
87
88 /*
89 * the value written to ports to test existence. PC-style ports will
90 * return the value written. AT-style ports will return 0. so why not
91 * make them the same ?
92 */
93 #define LP_DUMMY 0x00
94
95 /*
96 * This is the port delay time, in microseconds.
97 * It is used only in the lp_init() and lp_reset() routine.
98 */
99 #define LP_DELAY 50
100
101 #endif