xref: /openbmc/linux/include/linux/lp.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
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