Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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 | */ | |
607ca46e DH |
8 | #ifndef _LINUX_LP_H |
9 | #define _LINUX_LP_H | |
1da177e4 | 10 | |
1da177e4 LT |
11 | |
12 | #include <linux/wait.h> | |
0a5dcb51 | 13 | #include <linux/mutex.h> |
607ca46e | 14 | #include <uapi/linux/lp.h> |
1da177e4 LT |
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; | |
0a5dcb51 | 60 | struct mutex port_mutex; |
1da177e4 LT |
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 |