aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/tty_ldisc.h
blob: 6226504d91080bd10b9eb91e7a6adf4cbc3ab579 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
#ifndef _LINUX_TTY_LDISC_H
#define _LINUX_TTY_LDISC_H

/*
 * This structure defines the interface between the tty line discipline
 * implementation and the tty routines.  The following routines can be
 * defined; unless noted otherwise, they are optional, and can be
 * filled in with a null pointer.
 *
 * int	(*open)(struct tty_struct *);
 *
 * 	This function is called when the line discipline is associated
 * 	with the tty.  The line discipline can use this as an
 * 	opportunity to initialize any state needed by the ldisc routines.
 * 
 * void	(*close)(struct tty_struct *);
 *
 *	This function is called when the line discipline is being
 * 	shutdown, either because the tty is being closed or because
 * 	the tty is being changed to use a new line discipline
 * 
 * void	(*flush_buffer)(struct tty_struct *tty);
 *
 * 	This function instructs the line discipline to clear its
 * 	buffers of any input characters it may have queued to be
 * 	delivered to the user mode process.
 * 
 * ssize_t (*chars_in_buffer)(struct tty_struct *tty);
 *
 * 	This function returns the number of input characters the line
 *	discipline may have queued up to be delivered to the user mode
 *	process.
 * 
 * ssize_t (*read)(struct tty_struct * tty, struct file * file,
 *		   unsigned char * buf, size_t nr);
 *
 * 	This function is called when the user requests to read from
 * 	the tty.  The line discipline will return whatever characters
 * 	it has buffered up for the user.  If this function is not
 * 	defined, the user will receive an EIO error.
 * 
 * ssize_t (*write)(struct tty_struct * tty, struct file * file,
 * 		    const unsigned char * buf, size_t nr);
 *
 * 	This function is called when the user requests to write to the
 * 	tty.  The line discipline will deliver the characters to the
 * 	low-level tty device for transmission, optionally performing
 * 	some processing on the characters first.  If this function is
 * 	not defined, the user will receive an EIO error.
 * 
 * int	(*ioctl)(struct tty_struct * tty, struct file * file,
 * 		 unsigned int cmd, unsigned long arg);
 *
 *	This function is called when the user requests an ioctl which
 * 	is not handled by the tty layer or the low-level tty driver.
 * 	It is intended for ioctls which affect line discpline
 * 	operation.  Note that the search order for ioctls is (1) tty
 * 	layer, (2) tty low-level driver, (3) line discpline.  So a
 * 	low-level driver can "grab" an ioctl request before the line
 * 	discpline has a chance to see it.
 * 
 * long	(*compat_ioctl)(struct tty_struct * tty, struct file * file,
 * 		        unsigned int cmd, unsigned long arg);
 *
 *      Process ioctl calls from 32-bit process on 64-bit system
 *
 * void	(*set_termios)(struct tty_struct *tty, struct ktermios * old);
 *
 * 	This function notifies the line discpline that a change has
 * 	been made to the termios structure.
 * 
 * int	(*poll)(struct tty_struct * tty, struct file * file,
 * 		  poll_table *wait);
 *
 * 	This function is called when a user attempts to select/poll on a
 * 	tty device.  It is solely the responsibility of the line
 * 	discipline to handle poll requests.
 *
 * void	(*receive_buf)(struct tty_struct *, const unsigned char *cp,
 * 		       char *fp, int count);
 *
 * 	This function is called by the low-level tty driver to send
 * 	characters received by the hardware to the line discpline for
 * 	processing.  <cp> is a pointer to the buffer of input
 * 	character received by the device.  <fp> is a pointer to a
 * 	pointer of flag bytes which indicate whether a character was
 * 	received with a parity error, etc.
 * 
 * void	(*write_wakeup)(struct tty_struct *);
 *
 * 	This function is called by the low-level tty driver to signal
 * 	that line discpline should try to send more characters to the
 * 	low-level driver for transmission.  If the line discpline does
 * 	not have any more data to send, it can just return.
 *
 * int (*hangup)(struct tty_struct *)
 *
 *	Called on a hangup. Tells the discipline that it should
 *	cease I/O to the tty driver. Can sleep. The driver should
 *	seek to perform this action quickly but should wait until
 *	any pending driver I/O is completed.
 */

#include <linux/fs.h>
#include <linux/wait.h>

struct tty_ldisc {
	int	magic;
	char	*name;
	int	num;
	int	flags;
	
	/*
	 * The following routines are called from above.
	 */
	int	(*open)(struct tty_struct *);
	void	(*close)(struct tty_struct *);
	void	(*flush_buffer)(struct tty_struct *tty);
	ssize_t	(*chars_in_buffer)(struct tty_struct *tty);
	ssize_t	(*read)(struct tty_struct * tty, struct file * file,
			unsigned char __user * buf, size_t nr);
	ssize_t	(*write)(struct tty_struct * tty, struct file * file,
			 const unsigned char * buf, size_t nr);	
	int	(*ioctl)(struct tty_struct * tty, struct file * file,
			 unsigned int cmd, unsigned long arg);
	long	(*compat_ioctl)(struct tty_struct * tty, struct file * file,
				unsigned int cmd, unsigned long arg);
	void	(*set_termios)(struct tty_struct *tty, struct ktermios * old);
	unsigned int (*poll)(struct tty_struct *, struct file *,
			     struct poll_table_struct *);
	int	(*hangup)(struct tty_struct *tty);
	
	/*
	 * The following routines are called from below.
	 */
	void	(*receive_buf)(struct tty_struct *, const unsigned char *cp,
			       char *fp, int count);
	void	(*write_wakeup)(struct tty_struct *);

	struct  module *owner;
	
	int refcount;
};

#define TTY_LDISC_MAGIC	0x5403

#define LDISC_FLAG_DEFINED	0x00000001

#define MODULE_ALIAS_LDISC(ldisc) \
	MODULE_ALIAS("tty-ldisc-" __stringify(ldisc))

#endif /* _LINUX_TTY_LDISC_H */