1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
4 */
5
6 #ifndef __LINE_H__
7 #define __LINE_H__
8
9 #include <linux/list.h>
10 #include <linux/workqueue.h>
11 #include <linux/tty.h>
12 #include <linux/interrupt.h>
13 #include <linux/spinlock.h>
14 #include <linux/mutex.h>
15 #include "chan_user.h"
16 #include "mconsole_kern.h"
17
18 /* There's only two modifiable fields in this - .mc.list and .driver */
19 struct line_driver {
20 const char *name;
21 const char *device_name;
22 const short major;
23 const short minor_start;
24 const short type;
25 const short subtype;
26 const char *read_irq_name;
27 const char *write_irq_name;
28 struct mc_device mc;
29 struct tty_driver *driver;
30 };
31
32 struct line {
33 struct tty_port port;
34 int valid;
35
36 int read_irq, write_irq;
37
38 char *init_str;
39 struct list_head chan_list;
40 struct chan *chan_in, *chan_out;
41
42 /*This lock is actually, mostly, local to*/
43 spinlock_t lock;
44 int throttled;
45 /* Yes, this is a real circular buffer.
46 * XXX: And this should become a struct kfifo!
47 *
48 * buffer points to a buffer allocated on demand, of length
49 * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
50 u8 *buffer;
51 u8 *head;
52 u8 *tail;
53
54 int sigio;
55 struct delayed_work task;
56 const struct line_driver *driver;
57 };
58
59 extern void line_close(struct tty_struct *tty, struct file * filp);
60 extern int line_open(struct tty_struct *tty, struct file *filp);
61 extern int line_install(struct tty_driver *driver, struct tty_struct *tty,
62 struct line *line);
63 extern void line_cleanup(struct tty_struct *tty);
64 extern void line_hangup(struct tty_struct *tty);
65 extern int line_setup(char **conf, unsigned nlines, char **def,
66 char *init, char *name);
67 extern ssize_t line_write(struct tty_struct *tty, const u8 *buf, size_t len);
68 extern unsigned int line_chars_in_buffer(struct tty_struct *tty);
69 extern void line_flush_buffer(struct tty_struct *tty);
70 extern void line_flush_chars(struct tty_struct *tty);
71 extern unsigned int line_write_room(struct tty_struct *tty);
72 extern void line_throttle(struct tty_struct *tty);
73 extern void line_unthrottle(struct tty_struct *tty);
74
75 extern char *add_xterm_umid(char *base);
76 extern int line_setup_irq(int fd, int input, int output, struct line *line,
77 void *data);
78 extern void line_close_chan(struct line *line);
79 extern int register_lines(struct line_driver *line_driver,
80 const struct tty_operations *driver,
81 struct line *lines, int nlines);
82 extern int setup_one_line(struct line *lines, int n, char *init,
83 const struct chan_opts *opts, char **error_out);
84 extern void close_lines(struct line *lines, int nlines);
85
86 extern int line_config(struct line *lines, unsigned int sizeof_lines,
87 char *str, const struct chan_opts *opts,
88 char **error_out);
89 extern int line_id(char **str, int *start_out, int *end_out);
90 extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
91 char **error_out);
92 extern int line_get_config(char *dev, struct line *lines,
93 unsigned int sizeof_lines, char *str,
94 int size, char **error_out);
95
96 #endif
97
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