1/* 
  2 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
  3 * Licensed under the GPL
  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 one modifiable field in this - .mc.list */
 19struct 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 int read_irq;
 27	const char *read_irq_name;
 28	const int write_irq;
 29	const char *write_irq_name;
 30	struct mc_device mc;
 31};
 32
 33struct line {
 34	struct tty_struct *tty;
 35	spinlock_t count_lock;
 36	unsigned long count;
 37	int valid;
 38
 39	char *init_str;
 40	int init_pri;
 41	struct list_head chan_list;
 42
 43	/*This lock is actually, mostly, local to*/
 44	spinlock_t lock;
 45	int throttled;
 46	/* Yes, this is a real circular buffer.
 47	 * XXX: And this should become a struct kfifo!
 48	 *
 49	 * buffer points to a buffer allocated on demand, of length
 50	 * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
 51	char *buffer;
 52	char *head;
 53	char *tail;
 54
 55	int sigio;
 56	struct delayed_work task;
 57	const struct line_driver *driver;
 58	int have_irq;
 59};
 60
 61#define LINE_INIT(str, d) \
 62	{ .count_lock =	__SPIN_LOCK_UNLOCKED((str).count_lock), \
 63	  .init_str =	str,	\
 64	  .init_pri =	INIT_STATIC, \
 65	  .valid =	1, \
 66	  .lock =	__SPIN_LOCK_UNLOCKED((str).lock), \
 67	  .driver =	d }
 68
 69extern void line_close(struct tty_struct *tty, struct file * filp);
 70extern int line_open(struct line *lines, struct tty_struct *tty);
 71extern int line_setup(struct line *lines, unsigned int sizeof_lines,
 72		      char *init, char **error_out);
 73extern int line_write(struct tty_struct *tty, const unsigned char *buf,
 74		      int len);
 75extern int line_put_char(struct tty_struct *tty, unsigned char ch);
 76extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
 77extern int line_chars_in_buffer(struct tty_struct *tty);
 78extern void line_flush_buffer(struct tty_struct *tty);
 79extern void line_flush_chars(struct tty_struct *tty);
 80extern int line_write_room(struct tty_struct *tty);
 81extern int line_ioctl(struct tty_struct *tty, unsigned int cmd,
 82				unsigned long arg);
 83extern void line_throttle(struct tty_struct *tty);
 84extern void line_unthrottle(struct tty_struct *tty);
 85
 86extern char *add_xterm_umid(char *base);
 87extern int line_setup_irq(int fd, int input, int output, struct line *line,
 88			  void *data);
 89extern void line_close_chan(struct line *line);
 90extern struct tty_driver *register_lines(struct line_driver *line_driver,
 91					 const struct tty_operations *driver,
 92					 struct line *lines, int nlines);
 93extern void lines_init(struct line *lines, int nlines, struct chan_opts *opts);
 94extern void close_lines(struct line *lines, int nlines);
 95
 96extern int line_config(struct line *lines, unsigned int sizeof_lines,
 97		       char *str, const struct chan_opts *opts,
 98		       char **error_out);
 99extern int line_id(char **str, int *start_out, int *end_out);
100extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
101		       char **error_out);
102extern int line_get_config(char *dev, struct line *lines,
103			   unsigned int sizeof_lines, char *str,
104			   int size, char **error_out);
105
106#endif