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 |
102 | |